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   1 /*
   2  * Core routines and tables shareable across OS platforms.
   3  *
   4  * Copyright (c) 1994-2002 Justin T. Gibbs.
   5  * Copyright (c) 2000-2003 Adaptec Inc.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions, and the following disclaimer,
  13  *    without modification.
  14  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  15  *    substantially similar to the "NO WARRANTY" disclaimer below
  16  *    ("Disclaimer") and any redistribution must be conditioned upon
  17  *    including a substantially similar Disclaimer requirement for further
  18  *    binary redistribution.
  19  * 3. Neither the names of the above-listed copyright holders nor the names
  20  *    of any contributors may be used to endorse or promote products derived
  21  *    from this software without specific prior written permission.
  22  *
  23  * Alternatively, this software may be distributed under the terms of the
  24  * GNU General Public License ("GPL") version 2 as published by the Free
  25  * Software Foundation.
  26  *
  27  * NO WARRANTY
  28  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  29  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  30  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  31  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  32  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  36  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  37  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  38  * POSSIBILITY OF SUCH DAMAGES.
  39  *
  40  * $Id: //depot/aic7xxx/aic7xxx/aic79xx.c#250 $
  41  */
  42
  43 #ifdef __linux__
  44 #include "aic79xx_osm.h"
  45 #include "aic79xx_inline.h"
  46 #include "aicasm/aicasm_insformat.h"
  47 #else
  48 #include <dev/aic7xxx/aic79xx_osm.h>
  49 #include <dev/aic7xxx/aic79xx_inline.h>
  50 #include <dev/aic7xxx/aicasm/aicasm_insformat.h>
  51 #endif
  52
  53
  54 /***************************** Lookup Tables **********************************/
  55 static const char *const ahd_chip_names[] =
  56 {
  57         "NONE",
  58         "aic7901",
  59         "aic7902",
  60         "aic7901A"
  61 };
  62 static const u_int num_chip_names = ARRAY_SIZE(ahd_chip_names);
  63
  64 /*
  65  * Hardware error codes.
  66  */
  67 struct ahd_hard_error_entry {
  68         uint8_t errno;
  69         const char *errmesg;
  70 };
  71
  72 static const struct ahd_hard_error_entry ahd_hard_errors[] = {
  73         { DSCTMOUT,     "Discard Timer has timed out" },
  74         { ILLOPCODE,    "Illegal Opcode in sequencer program" },
  75         { SQPARERR,     "Sequencer Parity Error" },
  76         { DPARERR,      "Data-path Parity Error" },
  77         { MPARERR,      "Scratch or SCB Memory Parity Error" },
  78         { CIOPARERR,    "CIOBUS Parity Error" },
  79 };
  80 static const u_int num_errors = ARRAY_SIZE(ahd_hard_errors);
  81
  82 static const struct ahd_phase_table_entry ahd_phase_table[] =
  83 {
  84         { P_DATAOUT,    MSG_NOOP,               "in Data-out phase"     },
  85         { P_DATAIN,     MSG_INITIATOR_DET_ERR,  "in Data-in phase"      },
  86         { P_DATAOUT_DT, MSG_NOOP,               "in DT Data-out phase"  },
  87         { P_DATAIN_DT,  MSG_INITIATOR_DET_ERR,  "in DT Data-in phase"   },
  88         { P_COMMAND,    MSG_NOOP,               "in Command phase"      },
  89         { P_MESGOUT,    MSG_NOOP,               "in Message-out phase"  },
  90         { P_STATUS,     MSG_INITIATOR_DET_ERR,  "in Status phase"       },
  91         { P_MESGIN,     MSG_PARITY_ERROR,       "in Message-in phase"   },
  92         { P_BUSFREE,    MSG_NOOP,               "while idle"            },
  93         { 0,            MSG_NOOP,               "in unknown phase"      }
  94 };
  95
  96 /*
  97  * In most cases we only wish to itterate over real phases, so
  98  * exclude the last element from the count.
  99  */
 100 static const u_int num_phases = ARRAY_SIZE(ahd_phase_table) - 1;
 101
 102 /* Our Sequencer Program */
 103 #include "aic79xx_seq.h"
 104
 105 /**************************** Function Declarations ***************************/
 106 static void             ahd_handle_transmission_error(struct ahd_softc *ahd);
 107 static void             ahd_handle_lqiphase_error(struct ahd_softc *ahd,
 108                                                   u_int lqistat1);
 109 static int              ahd_handle_pkt_busfree(struct ahd_softc *ahd,
 110                                                u_int busfreetime);
 111 static int              ahd_handle_nonpkt_busfree(struct ahd_softc *ahd);
 112 static void             ahd_handle_proto_violation(struct ahd_softc *ahd);
 113 static void             ahd_force_renegotiation(struct ahd_softc *ahd,
 114                                                 struct ahd_devinfo *devinfo);
 115
 116 static struct ahd_tmode_tstate*
 117                         ahd_alloc_tstate(struct ahd_softc *ahd,
 118                                          u_int scsi_id, char channel);
 119 #ifdef AHD_TARGET_MODE
 120 static void             ahd_free_tstate(struct ahd_softc *ahd,
 121                                         u_int scsi_id, char channel, int force);
 122 #endif
 123 static void             ahd_devlimited_syncrate(struct ahd_softc *ahd,
 124                                                 struct ahd_initiator_tinfo *,
 125                                                 u_int *period,
 126                                                 u_int *ppr_options,
 127                                                 role_t role);
 128 static void             ahd_update_neg_table(struct ahd_softc *ahd,
 129                                              struct ahd_devinfo *devinfo,
 130                                              struct ahd_transinfo *tinfo);
 131 static void             ahd_update_pending_scbs(struct ahd_softc *ahd);
 132 static void             ahd_fetch_devinfo(struct ahd_softc *ahd,
 133                                           struct ahd_devinfo *devinfo);
 134 static void             ahd_scb_devinfo(struct ahd_softc *ahd,
 135                                         struct ahd_devinfo *devinfo,
 136                                         struct scb *scb);
 137 static void             ahd_setup_initiator_msgout(struct ahd_softc *ahd,
 138                                                    struct ahd_devinfo *devinfo,
 139                                                    struct scb *scb);
 140 static void             ahd_build_transfer_msg(struct ahd_softc *ahd,
 141                                                struct ahd_devinfo *devinfo);
 142 static void             ahd_construct_sdtr(struct ahd_softc *ahd,
 143                                            struct ahd_devinfo *devinfo,
 144                                            u_int period, u_int offset);
 145 static void             ahd_construct_wdtr(struct ahd_softc *ahd,
 146                                            struct ahd_devinfo *devinfo,
 147                                            u_int bus_width);
 148 static void             ahd_construct_ppr(struct ahd_softc *ahd,
 149                                           struct ahd_devinfo *devinfo,
 150                                           u_int period, u_int offset,
 151                                           u_int bus_width, u_int ppr_options);
 152 static void             ahd_clear_msg_state(struct ahd_softc *ahd);
 153 static void             ahd_handle_message_phase(struct ahd_softc *ahd);
 154 typedef enum {
 155         AHDMSG_1B,
 156         AHDMSG_2B,
 157         AHDMSG_EXT
 158 } ahd_msgtype;
 159 static int              ahd_sent_msg(struct ahd_softc *ahd, ahd_msgtype type,
 160                                      u_int msgval, int full);
 161 static int              ahd_parse_msg(struct ahd_softc *ahd,
 162                                       struct ahd_devinfo *devinfo);
 163 static int              ahd_handle_msg_reject(struct ahd_softc *ahd,
 164                                               struct ahd_devinfo *devinfo);
 165 static void             ahd_handle_ign_wide_residue(struct ahd_softc *ahd,
 166                                                 struct ahd_devinfo *devinfo);
 167 static void             ahd_reinitialize_dataptrs(struct ahd_softc *ahd);
 168 static void             ahd_handle_devreset(struct ahd_softc *ahd,
 169                                             struct ahd_devinfo *devinfo,
 170                                             u_int lun, cam_status status,
 171                                             char *message, int verbose_level);
 172 #ifdef AHD_TARGET_MODE
 173 static void             ahd_setup_target_msgin(struct ahd_softc *ahd,
 174                                                struct ahd_devinfo *devinfo,
 175                                                struct scb *scb);
 176 #endif
 177
 178 static u_int            ahd_sglist_size(struct ahd_softc *ahd);
 179 static u_int            ahd_sglist_allocsize(struct ahd_softc *ahd);
 180 static bus_dmamap_callback_t
 181                         ahd_dmamap_cb;
 182 static void             ahd_initialize_hscbs(struct ahd_softc *ahd);
 183 static int              ahd_init_scbdata(struct ahd_softc *ahd);
 184 static void             ahd_fini_scbdata(struct ahd_softc *ahd);
 185 static void             ahd_setup_iocell_workaround(struct ahd_softc *ahd);
 186 static void             ahd_iocell_first_selection(struct ahd_softc *ahd);
 187 static void             ahd_add_col_list(struct ahd_softc *ahd,
 188                                          struct scb *scb, u_int col_idx);
 189 static void             ahd_rem_col_list(struct ahd_softc *ahd,
 190                                          struct scb *scb);
 191 static void             ahd_chip_init(struct ahd_softc *ahd);
 192 static void             ahd_qinfifo_requeue(struct ahd_softc *ahd,
 193                                             struct scb *prev_scb,
 194                                             struct scb *scb);
 195 static int              ahd_qinfifo_count(struct ahd_softc *ahd);
 196 static int              ahd_search_scb_list(struct ahd_softc *ahd, int target,
 197                                             char channel, int lun, u_int tag,
 198                                             role_t role, uint32_t status,
 199                                             ahd_search_action action,
 200                                             u_int *list_head, u_int *list_tail,
 201                                             u_int tid);
 202 static void             ahd_stitch_tid_list(struct ahd_softc *ahd,
 203                                             u_int tid_prev, u_int tid_cur,
 204                                             u_int tid_next);
 205 static void             ahd_add_scb_to_free_list(struct ahd_softc *ahd,
 206                                                  u_int scbid);
 207 static u_int            ahd_rem_wscb(struct ahd_softc *ahd, u_int scbid,
 208                                      u_int prev, u_int next, u_int tid);
 209 static void             ahd_reset_current_bus(struct ahd_softc *ahd);
 210 static ahd_callback_t   ahd_stat_timer;
 211 #ifdef AHD_DUMP_SEQ
 212 static void             ahd_dumpseq(struct ahd_softc *ahd);
 213 #endif
 214 static void             ahd_loadseq(struct ahd_softc *ahd);
 215 static int              ahd_check_patch(struct ahd_softc *ahd,
 216                                         const struct patch **start_patch,
 217                                         u_int start_instr, u_int *skip_addr);
 218 static u_int            ahd_resolve_seqaddr(struct ahd_softc *ahd,
 219                                             u_int address);
 220 static void             ahd_download_instr(struct ahd_softc *ahd,
 221                                            u_int instrptr, uint8_t *dconsts);
 222 static int              ahd_probe_stack_size(struct ahd_softc *ahd);
 223 static int              ahd_scb_active_in_fifo(struct ahd_softc *ahd,
 224                                                struct scb *scb);
 225 static void             ahd_run_data_fifo(struct ahd_softc *ahd,
 226                                           struct scb *scb);
 227
 228 #ifdef AHD_TARGET_MODE
 229 static void             ahd_queue_lstate_event(struct ahd_softc *ahd,
 230                                                struct ahd_tmode_lstate *lstate,
 231                                                u_int initiator_id,
 232                                                u_int event_type,
 233                                                u_int event_arg);
 234 static void             ahd_update_scsiid(struct ahd_softc *ahd,
 235                                           u_int targid_mask);
 236 static int              ahd_handle_target_cmd(struct ahd_softc *ahd,
 237                                               struct target_cmd *cmd);
 238 #endif
 239
 240 static int              ahd_abort_scbs(struct ahd_softc *ahd, int target,
 241                                        char channel, int lun, u_int tag,
 242                                        role_t role, uint32_t status);
 243 static void             ahd_alloc_scbs(struct ahd_softc *ahd);
 244 static void             ahd_busy_tcl(struct ahd_softc *ahd, u_int tcl,
 245                                      u_int scbid);
 246 static void             ahd_calc_residual(struct ahd_softc *ahd,
 247                                           struct scb *scb);
 248 static void             ahd_clear_critical_section(struct ahd_softc *ahd);
 249 static void             ahd_clear_intstat(struct ahd_softc *ahd);
 250 static void             ahd_enable_coalescing(struct ahd_softc *ahd,
 251                                               int enable);
 252 static u_int            ahd_find_busy_tcl(struct ahd_softc *ahd, u_int tcl);
 253 static void             ahd_freeze_devq(struct ahd_softc *ahd,
 254                                         struct scb *scb);
 255 static void             ahd_handle_scb_status(struct ahd_softc *ahd,
 256                                               struct scb *scb);
 257 static const struct ahd_phase_table_entry* ahd_lookup_phase_entry(int phase);
 258 static void             ahd_shutdown(void *arg);
 259 static void             ahd_update_coalescing_values(struct ahd_softc *ahd,
 260                                                      u_int timer,
 261                                                      u_int maxcmds,
 262                                                      u_int mincmds);
 263 static int              ahd_verify_vpd_cksum(struct vpd_config *vpd);
 264 static int              ahd_wait_seeprom(struct ahd_softc *ahd);
 265 static int              ahd_match_scb(struct ahd_softc *ahd, struct scb *scb,
 266                                       int target, char channel, int lun,
 267                                       u_int tag, role_t role);
 268
 269 static void             ahd_reset_cmds_pending(struct ahd_softc *ahd);
 270
 271 /*************************** Interrupt Services *******************************/
 272 static void             ahd_run_qoutfifo(struct ahd_softc *ahd);
 273 #ifdef AHD_TARGET_MODE
 274 static void             ahd_run_tqinfifo(struct ahd_softc *ahd, int paused);
 275 #endif
 276 static void             ahd_handle_hwerrint(struct ahd_softc *ahd);
 277 static void             ahd_handle_seqint(struct ahd_softc *ahd, u_int intstat);
 278 static void             ahd_handle_scsiint(struct ahd_softc *ahd,
 279                                            u_int intstat);
 280
 281 /************************ Sequencer Execution Control *************************/
 282 void
 283 ahd_set_modes(struct ahd_softc *ahd, ahd_mode src, ahd_mode dst)
 284 {
 285         if (ahd->src_mode == src && ahd->dst_mode == dst)
 286                 return;
 287 #ifdef AHD_DEBUG
 288         if (ahd->src_mode == AHD_MODE_UNKNOWN
 289          || ahd->dst_mode == AHD_MODE_UNKNOWN)
 290                 panic("Setting mode prior to saving it.\n");
 291         if ((ahd_debug & AHD_SHOW_MODEPTR) != 0)
 292                 printf("%s: Setting mode 0x%x\n", ahd_name(ahd),
 293                        ahd_build_mode_state(ahd, src, dst));
 294 #endif
 295         ahd_outb(ahd, MODE_PTR, ahd_build_mode_state(ahd, src, dst));
 296         ahd->src_mode = src;
 297         ahd->dst_mode = dst;
 298 }
 299
 300 static void
 301 ahd_update_modes(struct ahd_softc *ahd)
 302 {
 303         ahd_mode_state mode_ptr;
 304         ahd_mode src;
 305         ahd_mode dst;
 306
 307         mode_ptr = ahd_inb(ahd, MODE_PTR);
 308 #ifdef AHD_DEBUG
 309         if ((ahd_debug & AHD_SHOW_MODEPTR) != 0)
 310                 printf("Reading mode 0x%x\n", mode_ptr);
 311 #endif
 312         ahd_extract_mode_state(ahd, mode_ptr, &src, &dst);
 313         ahd_known_modes(ahd, src, dst);
 314 }
 315
 316 static void
 317 ahd_assert_modes(struct ahd_softc *ahd, ahd_mode srcmode,
 318                  ahd_mode dstmode, const char *file, int line)
 319 {
 320 #ifdef AHD_DEBUG
 321         if ((srcmode & AHD_MK_MSK(ahd->src_mode)) == 0
 322          || (dstmode & AHD_MK_MSK(ahd->dst_mode)) == 0) {
 323                 panic("%s:%s:%d: Mode assertion failed.\n",
 324                        ahd_name(ahd), file, line);
 325         }
 326 #endif
 327 }
 328
 329 #define AHD_ASSERT_MODES(ahd, source, dest) \
 330         ahd_assert_modes(ahd, source, dest, __FILE__, __LINE__);
 331
 332 ahd_mode_state
 333 ahd_save_modes(struct ahd_softc *ahd)
 334 {
 335         if (ahd->src_mode == AHD_MODE_UNKNOWN
 336          || ahd->dst_mode == AHD_MODE_UNKNOWN)
 337                 ahd_update_modes(ahd);
 338
 339         return (ahd_build_mode_state(ahd, ahd->src_mode, ahd->dst_mode));
 340 }
 341
 342 void
 343 ahd_restore_modes(struct ahd_softc *ahd, ahd_mode_state state)
 344 {
 345         ahd_mode src;
 346         ahd_mode dst;
 347
 348         ahd_extract_mode_state(ahd, state, &src, &dst);
 349         ahd_set_modes(ahd, src, dst);
 350 }
 351
 352 /*
 353  * Determine whether the sequencer has halted code execution.
 354  * Returns non-zero status if the sequencer is stopped.
 355  */
 356 int
 357 ahd_is_paused(struct ahd_softc *ahd)
 358 {
 359         return ((ahd_inb(ahd, HCNTRL) & PAUSE) != 0);
 360 }
 361
 362 /*
 363  * Request that the sequencer stop and wait, indefinitely, for it
 364  * to stop.  The sequencer will only acknowledge that it is paused
 365  * once it has reached an instruction boundary and PAUSEDIS is
 366  * cleared in the SEQCTL register.  The sequencer may use PAUSEDIS
 367  * for critical sections.
 368  */
 369 void
 370 ahd_pause(struct ahd_softc *ahd)
 371 {
 372         ahd_outb(ahd, HCNTRL, ahd->pause);
 373
 374         /*
 375          * Since the sequencer can disable pausing in a critical section, we
 376          * must loop until it actually stops.
 377          */
 378         while (ahd_is_paused(ahd) == 0)
 379                 ;
 380 }
 381
 382 /*
 383  * Allow the sequencer to continue program execution.
 384  * We check here to ensure that no additional interrupt
 385  * sources that would cause the sequencer to halt have been
 386  * asserted.  If, for example, a SCSI bus reset is detected
 387  * while we are fielding a different, pausing, interrupt type,
 388  * we don't want to release the sequencer before going back
 389  * into our interrupt handler and dealing with this new
 390  * condition.
 391  */
 392 void
 393 ahd_unpause(struct ahd_softc *ahd)
 394 {
 395         /*
 396          * Automatically restore our modes to those saved
 397          * prior to the first change of the mode.
 398          */
 399         if (ahd->saved_src_mode != AHD_MODE_UNKNOWN
 400          && ahd->saved_dst_mode != AHD_MODE_UNKNOWN) {
 401                 if ((ahd->flags & AHD_UPDATE_PEND_CMDS) != 0)
 402                         ahd_reset_cmds_pending(ahd);
 403                 ahd_set_modes(ahd, ahd->saved_src_mode, ahd->saved_dst_mode);
 404         }
 405
 406         if ((ahd_inb(ahd, INTSTAT) & ~CMDCMPLT) == 0)
 407                 ahd_outb(ahd, HCNTRL, ahd->unpause);
 408
 409         ahd_known_modes(ahd, AHD_MODE_UNKNOWN, AHD_MODE_UNKNOWN);
 410 }
 411
 412 /*********************** Scatter Gather List Handling *************************/
 413 void *
 414 ahd_sg_setup(struct ahd_softc *ahd, struct scb *scb,
 415              void *sgptr, dma_addr_t addr, bus_size_t len, int last)
 416 {
 417         scb->sg_count++;
 418         if (sizeof(dma_addr_t) > 4
 419          && (ahd->flags & AHD_64BIT_ADDRESSING) != 0) {
 420                 struct ahd_dma64_seg *sg;
 421
 422                 sg = (struct ahd_dma64_seg *)sgptr;
 423                 sg->addr = ahd_htole64(addr);
 424                 sg->len = ahd_htole32(len | (last ? AHD_DMA_LAST_SEG : 0));
 425                 return (sg + 1);
 426         } else {
 427                 struct ahd_dma_seg *sg;
 428
 429                 sg = (struct ahd_dma_seg *)sgptr;
 430                 sg->addr = ahd_htole32(addr & 0xFFFFFFFF);
 431                 sg->len = ahd_htole32(len | ((addr >> 8) & 0x7F000000)
 432                                     | (last ? AHD_DMA_LAST_SEG : 0));
 433                 return (sg + 1);
 434         }
 435 }
 436
 437 static void
 438 ahd_setup_scb_common(struct ahd_softc *ahd, struct scb *scb)
 439 {
 440         /* XXX Handle target mode SCBs. */
 441         scb->crc_retry_count = 0;
 442         if ((scb->flags & SCB_PACKETIZED) != 0) {
 443                 /* XXX what about ACA??  It is type 4, but TAG_TYPE == 0x3. */
 444                 scb->hscb->task_attribute = scb->hscb->control & SCB_TAG_TYPE;
 445         } else {
 446                 if (ahd_get_transfer_length(scb) & 0x01)
 447                         scb->hscb->task_attribute = SCB_XFERLEN_ODD;
 448                 else
 449                         scb->hscb->task_attribute = 0;
 450         }
 451
 452         if (scb->hscb->cdb_len <= MAX_CDB_LEN_WITH_SENSE_ADDR
 453          || (scb->hscb->cdb_len & SCB_CDB_LEN_PTR) != 0)
 454                 scb->hscb->shared_data.idata.cdb_plus_saddr.sense_addr =
 455                     ahd_htole32(scb->sense_busaddr);
 456 }
 457
 458 static void
 459 ahd_setup_data_scb(struct ahd_softc *ahd, struct scb *scb)
 460 {
 461         /*
 462          * Copy the first SG into the "current" data ponter area.
 463          */
 464         if ((ahd->flags & AHD_64BIT_ADDRESSING) != 0) {
 465                 struct ahd_dma64_seg *sg;
 466
 467                 sg = (struct ahd_dma64_seg *)scb->sg_list;
 468                 scb->hscb->dataptr = sg->addr;
 469                 scb->hscb->datacnt = sg->len;
 470         } else {
 471                 struct ahd_dma_seg *sg;
 472                 uint32_t *dataptr_words;
 473
 474                 sg = (struct ahd_dma_seg *)scb->sg_list;
 475                 dataptr_words = (uint32_t*)&scb->hscb->dataptr;
 476                 dataptr_words[0] = sg->addr;
 477                 dataptr_words[1] = 0;
 478                 if ((ahd->flags & AHD_39BIT_ADDRESSING) != 0) {
 479                         uint64_t high_addr;
 480
 481                         high_addr = ahd_le32toh(sg->len) & 0x7F000000;
 482                         scb->hscb->dataptr |= ahd_htole64(high_addr << 8);
 483                 }
 484                 scb->hscb->datacnt = sg->len;
 485         }
 486         /*
 487          * Note where to find the SG entries in bus space.
 488          * We also set the full residual flag which the
 489          * sequencer will clear as soon as a data transfer
 490          * occurs.
 491          */
 492         scb->hscb->sgptr = ahd_htole32(scb->sg_list_busaddr|SG_FULL_RESID);
 493 }
 494
 495 static void
 496 ahd_setup_noxfer_scb(struct ahd_softc *ahd, struct scb *scb)
 497 {
 498         scb->hscb->sgptr = ahd_htole32(SG_LIST_NULL);
 499         scb->hscb->dataptr = 0;
 500         scb->hscb->datacnt = 0;
 501 }
 502
 503 /************************** Memory mapping routines ***************************/
 504 static void *
 505 ahd_sg_bus_to_virt(struct ahd_softc *ahd, struct scb *scb, uint32_t sg_busaddr)
 506 {
 507         dma_addr_t sg_offset;
 508
 509         /* sg_list_phys points to entry 1, not 0 */
 510         sg_offset = sg_busaddr - (scb->sg_list_busaddr - ahd_sg_size(ahd));
 511         return ((uint8_t *)scb->sg_list + sg_offset);
 512 }
 513
 514 static uint32_t
 515 ahd_sg_virt_to_bus(struct ahd_softc *ahd, struct scb *scb, void *sg)
 516 {
 517         dma_addr_t sg_offset;
 518
 519         /* sg_list_phys points to entry 1, not 0 */
 520         sg_offset = ((uint8_t *)sg - (uint8_t *)scb->sg_list)
 521                   - ahd_sg_size(ahd);
 522
 523         return (scb->sg_list_busaddr + sg_offset);
 524 }
 525
 526 static void
 527 ahd_sync_scb(struct ahd_softc *ahd, struct scb *scb, int op)
 528 {
 529         ahd_dmamap_sync(ahd, ahd->scb_data.hscb_dmat,
 530                         scb->hscb_map->dmamap,
 531                         /*offset*/(uint8_t*)scb->hscb - scb->hscb_map->vaddr,
 532                         /*len*/sizeof(*scb->hscb), op);
 533 }
 534
 535 void
 536 ahd_sync_sglist(struct ahd_softc *ahd, struct scb *scb, int op)
 537 {
 538         if (scb->sg_count == 0)
 539                 return;
 540
 541         ahd_dmamap_sync(ahd, ahd->scb_data.sg_dmat,
 542                         scb->sg_map->dmamap,
 543                         /*offset*/scb->sg_list_busaddr - ahd_sg_size(ahd),
 544                         /*len*/ahd_sg_size(ahd) * scb->sg_count, op);
 545 }
 546
 547 static void
 548 ahd_sync_sense(struct ahd_softc *ahd, struct scb *scb, int op)
 549 {
 550         ahd_dmamap_sync(ahd, ahd->scb_data.sense_dmat,
 551                         scb->sense_map->dmamap,
 552                         /*offset*/scb->sense_busaddr,
 553                         /*len*/AHD_SENSE_BUFSIZE, op);
 554 }
 555
 556 #ifdef AHD_TARGET_MODE
 557 static uint32_t
 558 ahd_targetcmd_offset(struct ahd_softc *ahd, u_int index)
 559 {
 560         return (((uint8_t *)&ahd->targetcmds[index])
 561                - (uint8_t *)ahd->qoutfifo);
 562 }
 563 #endif
 564
 565 /*********************** Miscelaneous Support Functions ***********************/
 566 /*
 567  * Return pointers to the transfer negotiation information
 568  * for the specified our_id/remote_id pair.
 569  */
 570 struct ahd_initiator_tinfo *
 571 ahd_fetch_transinfo(struct ahd_softc *ahd, char channel, u_int our_id,
 572                     u_int remote_id, struct ahd_tmode_tstate **tstate)
 573 {
 574         /*
 575          * Transfer data structures are stored from the perspective
 576          * of the target role.  Since the parameters for a connection
 577          * in the initiator role to a given target are the same as
 578          * when the roles are reversed, we pretend we are the target.
 579          */
 580         if (channel == 'B')
 581                 our_id += 8;
 582         *tstate = ahd->enabled_targets[our_id];
 583         return (&(*tstate)->transinfo[remote_id]);
 584 }
 585
 586 uint16_t
 587 ahd_inw(struct ahd_softc *ahd, u_int port)
 588 {
 589         /*
 590          * Read high byte first as some registers increment
 591          * or have other side effects when the low byte is
 592          * read.
 593          */
 594         uint16_t r = ahd_inb(ahd, port+1) << 8;
 595         return r | ahd_inb(ahd, port);
 596 }
 597
 598 void
 599 ahd_outw(struct ahd_softc *ahd, u_int port, u_int value)
 600 {
 601         /*
 602          * Write low byte first to accomodate registers
 603          * such as PRGMCNT where the order maters.
 604          */
 605         ahd_outb(ahd, port, value & 0xFF);
 606         ahd_outb(ahd, port+1, (value >> 8) & 0xFF);
 607 }
 608
 609 uint32_t
 610 ahd_inl(struct ahd_softc *ahd, u_int port)
 611 {
 612         return ((ahd_inb(ahd, port))
 613               | (ahd_inb(ahd, port+1) << 8)
 614               | (ahd_inb(ahd, port+2) << 16)
 615               | (ahd_inb(ahd, port+3) << 24));
 616 }
 617
 618 void
 619 ahd_outl(struct ahd_softc *ahd, u_int port, uint32_t value)
 620 {
 621         ahd_outb(ahd, port, (value) & 0xFF);
 622         ahd_outb(ahd, port+1, ((value) >> 8) & 0xFF);
 623         ahd_outb(ahd, port+2, ((value) >> 16) & 0xFF);
 624         ahd_outb(ahd, port+3, ((value) >> 24) & 0xFF);
 625 }
 626
 627 uint64_t
 628 ahd_inq(struct ahd_softc *ahd, u_int port)
 629 {
 630         return ((ahd_inb(ahd, port))
 631               | (ahd_inb(ahd, port+1) << 8)
 632               | (ahd_inb(ahd, port+2) << 16)
 633               | (ahd_inb(ahd, port+3) << 24)
 634               | (((uint64_t)ahd_inb(ahd, port+4)) << 32)
 635               | (((uint64_t)ahd_inb(ahd, port+5)) << 40)
 636               | (((uint64_t)ahd_inb(ahd, port+6)) << 48)
 637               | (((uint64_t)ahd_inb(ahd, port+7)) << 56));
 638 }
 639
 640 void
 641 ahd_outq(struct ahd_softc *ahd, u_int port, uint64_t value)
 642 {
 643         ahd_outb(ahd, port, value & 0xFF);
 644         ahd_outb(ahd, port+1, (value >> 8) & 0xFF);
 645         ahd_outb(ahd, port+2, (value >> 16) & 0xFF);
 646         ahd_outb(ahd, port+3, (value >> 24) & 0xFF);
 647         ahd_outb(ahd, port+4, (value >> 32) & 0xFF);
 648         ahd_outb(ahd, port+5, (value >> 40) & 0xFF);
 649         ahd_outb(ahd, port+6, (value >> 48) & 0xFF);
 650         ahd_outb(ahd, port+7, (value >> 56) & 0xFF);
 651 }
 652
 653 u_int
 654 ahd_get_scbptr(struct ahd_softc *ahd)
 655 {
 656         AHD_ASSERT_MODES(ahd, ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK),
 657                          ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK));
 658         return (ahd_inb(ahd, SCBPTR) | (ahd_inb(ahd, SCBPTR + 1) << 8));
 659 }
 660
 661 void
 662 ahd_set_scbptr(struct ahd_softc *ahd, u_int scbptr)
 663 {
 664         AHD_ASSERT_MODES(ahd, ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK),
 665                          ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK));
 666         ahd_outb(ahd, SCBPTR, scbptr & 0xFF);
 667         ahd_outb(ahd, SCBPTR+1, (scbptr >> 8) & 0xFF);
 668 }
 669
 670 #if 0 /* unused */
 671 static u_int
 672 ahd_get_hnscb_qoff(struct ahd_softc *ahd)
 673 {
 674         return (ahd_inw_atomic(ahd, HNSCB_QOFF));
 675 }
 676 #endif
 677
 678 static void
 679 ahd_set_hnscb_qoff(struct ahd_softc *ahd, u_int value)
 680 {
 681         ahd_outw_atomic(ahd, HNSCB_QOFF, value);
 682 }
 683
 684 #if 0 /* unused */
 685 static u_int
 686 ahd_get_hescb_qoff(struct ahd_softc *ahd)
 687 {
 688         return (ahd_inb(ahd, HESCB_QOFF));
 689 }
 690 #endif
 691
 692 static void
 693 ahd_set_hescb_qoff(struct ahd_softc *ahd, u_int value)
 694 {
 695         ahd_outb(ahd, HESCB_QOFF, value);
 696 }
 697
 698 static u_int
 699 ahd_get_snscb_qoff(struct ahd_softc *ahd)
 700 {
 701         u_int oldvalue;
 702
 703         AHD_ASSERT_MODES(ahd, AHD_MODE_CCHAN_MSK, AHD_MODE_CCHAN_MSK);
 704         oldvalue = ahd_inw(ahd, SNSCB_QOFF);
 705         ahd_outw(ahd, SNSCB_QOFF, oldvalue);
 706         return (oldvalue);
 707 }
 708
 709 static void
 710 ahd_set_snscb_qoff(struct ahd_softc *ahd, u_int value)
 711 {
 712         AHD_ASSERT_MODES(ahd, AHD_MODE_CCHAN_MSK, AHD_MODE_CCHAN_MSK);
 713         ahd_outw(ahd, SNSCB_QOFF, value);
 714 }
 715
 716 #if 0 /* unused */
 717 static u_int
 718 ahd_get_sescb_qoff(struct ahd_softc *ahd)
 719 {
 720         AHD_ASSERT_MODES(ahd, AHD_MODE_CCHAN_MSK, AHD_MODE_CCHAN_MSK);
 721         return (ahd_inb(ahd, SESCB_QOFF));
 722 }
 723 #endif
 724
 725 static void
 726 ahd_set_sescb_qoff(struct ahd_softc *ahd, u_int value)
 727 {
 728         AHD_ASSERT_MODES(ahd, AHD_MODE_CCHAN_MSK, AHD_MODE_CCHAN_MSK);
 729         ahd_outb(ahd, SESCB_QOFF, value);
 730 }
 731
 732 #if 0 /* unused */
 733 static u_int
 734 ahd_get_sdscb_qoff(struct ahd_softc *ahd)
 735 {
 736         AHD_ASSERT_MODES(ahd, AHD_MODE_CCHAN_MSK, AHD_MODE_CCHAN_MSK);
 737         return (ahd_inb(ahd, SDSCB_QOFF) | (ahd_inb(ahd, SDSCB_QOFF + 1) << 8));
 738 }
 739 #endif
 740
 741 static void
 742 ahd_set_sdscb_qoff(struct ahd_softc *ahd, u_int value)
 743 {
 744         AHD_ASSERT_MODES(ahd, AHD_MODE_CCHAN_MSK, AHD_MODE_CCHAN_MSK);
 745         ahd_outb(ahd, SDSCB_QOFF, value & 0xFF);
 746         ahd_outb(ahd, SDSCB_QOFF+1, (value >> 8) & 0xFF);
 747 }
 748
 749 u_int
 750 ahd_inb_scbram(struct ahd_softc *ahd, u_int offset)
 751 {
 752         u_int value;
 753
 754         /*
 755          * Workaround PCI-X Rev A. hardware bug.
 756          * After a host read of SCB memory, the chip
 757          * may become confused into thinking prefetch
 758          * was required.  This starts the discard timer
 759          * running and can cause an unexpected discard
 760          * timer interrupt.  The work around is to read
 761          * a normal register prior to the exhaustion of
 762          * the discard timer.  The mode pointer register
 763          * has no side effects and so serves well for
 764          * this purpose.
 765          *
 766          * Razor #528
 767          */
 768         value = ahd_inb(ahd, offset);
 769         if ((ahd->bugs & AHD_PCIX_SCBRAM_RD_BUG) != 0)
 770                 ahd_inb(ahd, MODE_PTR);
 771         return (value);
 772 }
 773
 774 u_int
 775 ahd_inw_scbram(struct ahd_softc *ahd, u_int offset)
 776 {
 777         return (ahd_inb_scbram(ahd, offset)
 778               | (ahd_inb_scbram(ahd, offset+1) << 8));
 779 }
 780
 781 static uint32_t
 782 ahd_inl_scbram(struct ahd_softc *ahd, u_int offset)
 783 {
 784         return (ahd_inw_scbram(ahd, offset)
 785               | (ahd_inw_scbram(ahd, offset+2) << 16));
 786 }
 787
 788 static uint64_t
 789 ahd_inq_scbram(struct ahd_softc *ahd, u_int offset)
 790 {
 791         return (ahd_inl_scbram(ahd, offset)
 792               | ((uint64_t)ahd_inl_scbram(ahd, offset+4)) << 32);
 793 }
 794
 795 struct scb *
 796 ahd_lookup_scb(struct ahd_softc *ahd, u_int tag)
 797 {
 798         struct scb* scb;
 799
 800         if (tag >= AHD_SCB_MAX)
 801                 return (NULL);
 802         scb = ahd->scb_data.scbindex[tag];
 803         if (scb != NULL)
 804                 ahd_sync_scb(ahd, scb,
 805                              BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);
 806         return (scb);
 807 }
 808
 809 static void
 810 ahd_swap_with_next_hscb(struct ahd_softc *ahd, struct scb *scb)
 811 {
 812         struct   hardware_scb *q_hscb;
 813         struct   map_node *q_hscb_map;
 814         uint32_t saved_hscb_busaddr;
 815
 816         /*
 817          * Our queuing method is a bit tricky.  The card
 818          * knows in advance which HSCB (by address) to download,
 819          * and we can't disappoint it.  To achieve this, the next
 820          * HSCB to download is saved off in ahd->next_queued_hscb.
 821          * When we are called to queue "an arbitrary scb",
 822          * we copy the contents of the incoming HSCB to the one
 823          * the sequencer knows about, swap HSCB pointers and
 824          * finally assign the SCB to the tag indexed location
 825          * in the scb_array.  This makes sure that we can still
 826          * locate the correct SCB by SCB_TAG.
 827          */
 828         q_hscb = ahd->next_queued_hscb;
 829         q_hscb_map = ahd->next_queued_hscb_map;
 830         saved_hscb_busaddr = q_hscb->hscb_busaddr;
 831         memcpy(q_hscb, scb->hscb, sizeof(*scb->hscb));
 832         q_hscb->hscb_busaddr = saved_hscb_busaddr;
 833         q_hscb->next_hscb_busaddr = scb->hscb->hscb_busaddr;
 834
 835         /* Now swap HSCB pointers. */
 836         ahd->next_queued_hscb = scb->hscb;
 837         ahd->next_queued_hscb_map = scb->hscb_map;
 838         scb->hscb = q_hscb;
 839         scb->hscb_map = q_hscb_map;
 840
 841         /* Now define the mapping from tag to SCB in the scbindex */
 842         ahd->scb_data.scbindex[SCB_GET_TAG(scb)] = scb;
 843 }
 844
 845 /*
 846  * Tell the sequencer about a new transaction to execute.
 847  */
 848 void
 849 ahd_queue_scb(struct ahd_softc *ahd, struct scb *scb)
 850 {
 851         ahd_swap_with_next_hscb(ahd, scb);
 852
 853         if (SCBID_IS_NULL(SCB_GET_TAG(scb)))
 854                 panic("Attempt to queue invalid SCB tag %x\n",
 855                       SCB_GET_TAG(scb));
 856
 857         /*
 858          * Keep a history of SCBs we've downloaded in the qinfifo.
 859          */
 860         ahd->qinfifo[AHD_QIN_WRAP(ahd->qinfifonext)] = SCB_GET_TAG(scb);
 861         ahd->qinfifonext++;
 862
 863         if (scb->sg_count != 0)
 864                 ahd_setup_data_scb(ahd, scb);
 865         else
 866                 ahd_setup_noxfer_scb(ahd, scb);
 867         ahd_setup_scb_common(ahd, scb);
 868
 869         /*
 870          * Make sure our data is consistent from the
 871          * perspective of the adapter.
 872          */
 873         ahd_sync_scb(ahd, scb, BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
 874
 875 #ifdef AHD_DEBUG
 876         if ((ahd_debug & AHD_SHOW_QUEUE) != 0) {
 877                 uint64_t host_dataptr;
 878
 879                 host_dataptr = ahd_le64toh(scb->hscb->dataptr);
 880                 printf("%s: Queueing SCB %d:0x%x bus addr 0x%x - 0x%x%x/0x%x\n",
 881                        ahd_name(ahd),
 882                        SCB_GET_TAG(scb), scb->hscb->scsiid,
 883                        ahd_le32toh(scb->hscb->hscb_busaddr),
 884                        (u_int)((host_dataptr >> 32) & 0xFFFFFFFF),
 885                        (u_int)(host_dataptr & 0xFFFFFFFF),
 886                        ahd_le32toh(scb->hscb->datacnt));
 887         }
 888 #endif
 889         /* Tell the adapter about the newly queued SCB */
 890         ahd_set_hnscb_qoff(ahd, ahd->qinfifonext);
 891 }
 892
 893 /************************** Interrupt Processing ******************************/
 894 static void
 895 ahd_sync_qoutfifo(struct ahd_softc *ahd, int op)
 896 {
 897         ahd_dmamap_sync(ahd, ahd->shared_data_dmat, ahd->shared_data_map.dmamap,
 898                         /*offset*/0,
 899                         /*len*/AHD_SCB_MAX * sizeof(struct ahd_completion), op);
 900 }
 901
 902 static void
 903 ahd_sync_tqinfifo(struct ahd_softc *ahd, int op)
 904 {
 905 #ifdef AHD_TARGET_MODE
 906         if ((ahd->flags & AHD_TARGETROLE) != 0) {
 907                 ahd_dmamap_sync(ahd, ahd->shared_data_dmat,
 908                                 ahd->shared_data_map.dmamap,
 909                                 ahd_targetcmd_offset(ahd, 0),
 910                                 sizeof(struct target_cmd) * AHD_TMODE_CMDS,
 911                                 op);
 912         }
 913 #endif
 914 }
 915
 916 /*
 917  * See if the firmware has posted any completed commands
 918  * into our in-core command complete fifos.
 919  */
 920 #define AHD_RUN_QOUTFIFO 0x1
 921 #define AHD_RUN_TQINFIFO 0x2
 922 static u_int
 923 ahd_check_cmdcmpltqueues(struct ahd_softc *ahd)
 924 {
 925         u_int retval;
 926
 927         retval = 0;
 928         ahd_dmamap_sync(ahd, ahd->shared_data_dmat, ahd->shared_data_map.dmamap,
 929                         /*offset*/ahd->qoutfifonext * sizeof(*ahd->qoutfifo),
 930                         /*len*/sizeof(*ahd->qoutfifo), BUS_DMASYNC_POSTREAD);
 931         if (ahd->qoutfifo[ahd->qoutfifonext].valid_tag
 932           == ahd->qoutfifonext_valid_tag)
 933                 retval |= AHD_RUN_QOUTFIFO;
 934 #ifdef AHD_TARGET_MODE
 935         if ((ahd->flags & AHD_TARGETROLE) != 0
 936          && (ahd->flags & AHD_TQINFIFO_BLOCKED) == 0) {
 937                 ahd_dmamap_sync(ahd, ahd->shared_data_dmat,
 938                                 ahd->shared_data_map.dmamap,
 939                                 ahd_targetcmd_offset(ahd, ahd->tqinfifofnext),
 940                                 /*len*/sizeof(struct target_cmd),
 941                                 BUS_DMASYNC_POSTREAD);
 942                 if (ahd->targetcmds[ahd->tqinfifonext].cmd_valid != 0)
 943                         retval |= AHD_RUN_TQINFIFO;
 944         }
 945 #endif
 946         return (retval);
 947 }
 948
 949 /*
 950  * Catch an interrupt from the adapter
 951  */
 952 int
 953 ahd_intr(struct ahd_softc *ahd)
 954 {
 955         u_int   intstat;
 956
 957         if ((ahd->pause & INTEN) == 0) {
 958                 /*
 959                  * Our interrupt is not enabled on the chip
 960                  * and may be disabled for re-entrancy reasons,
 961                  * so just return.  This is likely just a shared
 962                  * interrupt.
 963                  */
 964                 return (0);
 965         }
 966
 967         /*
 968          * Instead of directly reading the interrupt status register,
 969          * infer the cause of the interrupt by checking our in-core
 970          * completion queues.  This avoids a costly PCI bus read in
 971          * most cases.
 972          */
 973         if ((ahd->flags & AHD_ALL_INTERRUPTS) == 0
 974          && (ahd_check_cmdcmpltqueues(ahd) != 0))
 975                 intstat = CMDCMPLT;
 976         else
 977                 intstat = ahd_inb(ahd, INTSTAT);
 978
 979         if ((intstat & INT_PEND) == 0)
 980                 return (0);
 981
 982         if (intstat & CMDCMPLT) {
 983                 ahd_outb(ahd, CLRINT, CLRCMDINT);
 984
 985                 /*
 986                  * Ensure that the chip sees that we've cleared
 987                  * this interrupt before we walk the output fifo.
 988                  * Otherwise, we may, due to posted bus writes,
 989                  * clear the interrupt after we finish the scan,
 990                  * and after the sequencer has added new entries
 991                  * and asserted the interrupt again.
 992                  */
 993                 if ((ahd->bugs & AHD_INTCOLLISION_BUG) != 0) {
 994                         if (ahd_is_paused(ahd)) {
 995                                 /*
 996                                  * Potentially lost SEQINT.
 997                                  * If SEQINTCODE is non-zero,
 998                                  * simulate the SEQINT.
 999                                  */
1000                                 if (ahd_inb(ahd, SEQINTCODE) != NO_SEQINT)
1001                                         intstat |= SEQINT;
1002                         }
1003                 } else {
1004                         ahd_flush_device_writes(ahd);
1005                 }
1006                 ahd_run_qoutfifo(ahd);
1007                 ahd->cmdcmplt_counts[ahd->cmdcmplt_bucket]++;
1008                 ahd->cmdcmplt_total++;
1009 #ifdef AHD_TARGET_MODE
1010                 if ((ahd->flags & AHD_TARGETROLE) != 0)
1011                         ahd_run_tqinfifo(ahd, /*paused*/FALSE);
1012 #endif
1013         }
1014
1015         /*
1016          * Handle statuses that may invalidate our cached
1017          * copy of INTSTAT separately.
1018          */
1019         if (intstat == 0xFF && (ahd->features & AHD_REMOVABLE) != 0) {
1020                 /* Hot eject.  Do nothing */
1021         } else if (intstat & HWERRINT) {
1022                 ahd_handle_hwerrint(ahd);
1023         } else if ((intstat & (PCIINT|SPLTINT)) != 0) {
1024                 ahd->bus_intr(ahd);
1025         } else {
1026
1027                 if ((intstat & SEQINT) != 0)
1028                         ahd_handle_seqint(ahd, intstat);
1029
1030                 if ((intstat & SCSIINT) != 0)
1031                         ahd_handle_scsiint(ahd, intstat);
1032         }
1033         return (1);
1034 }
1035
1036 /******************************** Private Inlines *****************************/
1037 static inline void
1038 ahd_assert_atn(struct ahd_softc *ahd)
1039 {
1040         ahd_outb(ahd, SCSISIGO, ATNO);
1041 }
1042
1043 /*
1044  * Determine if the current connection has a packetized
1045  * agreement.  This does not necessarily mean that we
1046  * are currently in a packetized transfer.  We could
1047  * just as easily be sending or receiving a message.
1048  */
1049 static int
1050 ahd_currently_packetized(struct ahd_softc *ahd)
1051 {
1052         ahd_mode_state   saved_modes;
1053         int              packetized;
1054
1055         saved_modes = ahd_save_modes(ahd);
1056         if ((ahd->bugs & AHD_PKTIZED_STATUS_BUG) != 0) {
1057                 /*
1058                  * The packetized bit refers to the last
1059                  * connection, not the current one.  Check
1060                  * for non-zero LQISTATE instead.
1061                  */
1062                 ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
1063                 packetized = ahd_inb(ahd, LQISTATE) != 0;
1064         } else {
1065                 ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
1066                 packetized = ahd_inb(ahd, LQISTAT2) & PACKETIZED;
1067         }
1068         ahd_restore_modes(ahd, saved_modes);
1069         return (packetized);
1070 }
1071
1072 static inline int
1073 ahd_set_active_fifo(struct ahd_softc *ahd)
1074 {
1075         u_int active_fifo;
1076
1077         AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
1078         active_fifo = ahd_inb(ahd, DFFSTAT) & CURRFIFO;
1079         switch (active_fifo) {
1080         case 0:
1081         case 1:
1082                 ahd_set_modes(ahd, active_fifo, active_fifo);
1083                 return (1);
1084         default:
1085                 return (0);
1086         }
1087 }
1088
1089 static inline void
1090 ahd_unbusy_tcl(struct ahd_softc *ahd, u_int tcl)
1091 {
1092         ahd_busy_tcl(ahd, tcl, SCB_LIST_NULL);
1093 }
1094
1095 /*
1096  * Determine whether the sequencer reported a residual
1097  * for this SCB/transaction.
1098  */
1099 static inline void
1100 ahd_update_residual(struct ahd_softc *ahd, struct scb *scb)
1101 {
1102         uint32_t sgptr;
1103
1104         sgptr = ahd_le32toh(scb->hscb->sgptr);
1105         if ((sgptr & SG_STATUS_VALID) != 0)
1106                 ahd_calc_residual(ahd, scb);
1107 }
1108
1109 static inline void
1110 ahd_complete_scb(struct ahd_softc *ahd, struct scb *scb)
1111 {
1112         uint32_t sgptr;
1113
1114         sgptr = ahd_le32toh(scb->hscb->sgptr);
1115         if ((sgptr & SG_STATUS_VALID) != 0)
1116                 ahd_handle_scb_status(ahd, scb);
1117         else
1118                 ahd_done(ahd, scb);
1119 }
1120
1121
1122 /************************* Sequencer Execution Control ************************/
1123 /*
1124  * Restart the sequencer program from address zero
1125  */
1126 static void
1127 ahd_restart(struct ahd_softc *ahd)
1128 {
1129
1130         ahd_pause(ahd);
1131
1132         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
1133
1134         /* No more pending messages */
1135         ahd_clear_msg_state(ahd);
1136         ahd_outb(ahd, SCSISIGO, 0);             /* De-assert BSY */
1137         ahd_outb(ahd, MSG_OUT, MSG_NOOP);       /* No message to send */
1138         ahd_outb(ahd, SXFRCTL1, ahd_inb(ahd, SXFRCTL1) & ~BITBUCKET);
1139         ahd_outb(ahd, SEQINTCTL, 0);
1140         ahd_outb(ahd, LASTPHASE, P_BUSFREE);
1141         ahd_outb(ahd, SEQ_FLAGS, 0);
1142         ahd_outb(ahd, SAVED_SCSIID, 0xFF);
1143         ahd_outb(ahd, SAVED_LUN, 0xFF);
1144
1145         /*
1146          * Ensure that the sequencer's idea of TQINPOS
1147          * matches our own.  The sequencer increments TQINPOS
1148          * only after it sees a DMA complete and a reset could
1149          * occur before the increment leaving the kernel to believe
1150          * the command arrived but the sequencer to not.
1151          */
1152         ahd_outb(ahd, TQINPOS, ahd->tqinfifonext);
1153
1154         /* Always allow reselection */
1155         ahd_outb(ahd, SCSISEQ1,
1156                  ahd_inb(ahd, SCSISEQ_TEMPLATE) & (ENSELI|ENRSELI|ENAUTOATNP));
1157         ahd_set_modes(ahd, AHD_MODE_CCHAN, AHD_MODE_CCHAN);
1158
1159         /*
1160          * Clear any pending sequencer interrupt.  It is no
1161          * longer relevant since we're resetting the Program
1162          * Counter.
1163          */
1164         ahd_outb(ahd, CLRINT, CLRSEQINT);
1165
1166         ahd_outb(ahd, SEQCTL0, FASTMODE|SEQRESET);
1167         ahd_unpause(ahd);
1168 }
1169
1170 static void
1171 ahd_clear_fifo(struct ahd_softc *ahd, u_int fifo)
1172 {
1173         ahd_mode_state   saved_modes;
1174
1175 #ifdef AHD_DEBUG
1176         if ((ahd_debug & AHD_SHOW_FIFOS) != 0)
1177                 printf("%s: Clearing FIFO %d\n", ahd_name(ahd), fifo);
1178 #endif
1179         saved_modes = ahd_save_modes(ahd);
1180         ahd_set_modes(ahd, fifo, fifo);
1181         ahd_outb(ahd, DFFSXFRCTL, RSTCHN|CLRSHCNT);
1182         if ((ahd_inb(ahd, SG_STATE) & FETCH_INPROG) != 0)
1183                 ahd_outb(ahd, CCSGCTL, CCSGRESET);
1184         ahd_outb(ahd, LONGJMP_ADDR + 1, INVALID_ADDR);
1185         ahd_outb(ahd, SG_STATE, 0);
1186         ahd_restore_modes(ahd, saved_modes);
1187 }
1188
1189 /************************* Input/Output Queues ********************************/
1190 /*
1191  * Flush and completed commands that are sitting in the command
1192  * complete queues down on the chip but have yet to be dma'ed back up.
1193  */
1194 static void
1195 ahd_flush_qoutfifo(struct ahd_softc *ahd)
1196 {
1197         struct          scb *scb;
1198         ahd_mode_state  saved_modes;
1199         u_int           saved_scbptr;
1200         u_int           ccscbctl;
1201         u_int           scbid;
1202         u_int           next_scbid;
1203
1204         saved_modes = ahd_save_modes(ahd);
1205
1206         /*
1207          * Flush the good status FIFO for completed packetized commands.
1208          */
1209         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
1210         saved_scbptr = ahd_get_scbptr(ahd);
1211         while ((ahd_inb(ahd, LQISTAT2) & LQIGSAVAIL) != 0) {
1212                 u_int fifo_mode;
1213                 u_int i;
1214
1215                 scbid = ahd_inw(ahd, GSFIFO);
1216                 scb = ahd_lookup_scb(ahd, scbid);
1217                 if (scb == NULL) {
1218                         printf("%s: Warning - GSFIFO SCB %d invalid\n",
1219                                ahd_name(ahd), scbid);
1220                         continue;
1221                 }
1222                 /*
1223                  * Determine if this transaction is still active in
1224                  * any FIFO.  If it is, we must flush that FIFO to
1225                  * the host before completing the  command.
1226                  */
1227                 fifo_mode = 0;
1228 rescan_fifos:
1229                 for (i = 0; i < 2; i++) {
1230                         /* Toggle to the other mode. */
1231                         fifo_mode ^= 1;
1232                         ahd_set_modes(ahd, fifo_mode, fifo_mode);
1233
1234                         if (ahd_scb_active_in_fifo(ahd, scb) == 0)
1235                                 continue;
1236
1237                         ahd_run_data_fifo(ahd, scb);
1238
1239                         /*
1240                          * Running this FIFO may cause a CFG4DATA for
1241                          * this same transaction to assert in the other
1242                          * FIFO or a new snapshot SAVEPTRS interrupt
1243                          * in this FIFO.  Even running a FIFO may not
1244                          * clear the transaction if we are still waiting
1245                          * for data to drain to the host. We must loop
1246                          * until the transaction is not active in either
1247                          * FIFO just to be sure.  Reset our loop counter
1248                          * so we will visit both FIFOs again before
1249                          * declaring this transaction finished.  We
1250                          * also delay a bit so that status has a chance
1251                          * to change before we look at this FIFO again.
1252                          */
1253                         ahd_delay(200);
1254                         goto rescan_fifos;
1255                 }
1256                 ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
1257                 ahd_set_scbptr(ahd, scbid);
1258                 if ((ahd_inb_scbram(ahd, SCB_SGPTR) & SG_LIST_NULL) == 0
1259                  && ((ahd_inb_scbram(ahd, SCB_SGPTR) & SG_FULL_RESID) != 0
1260                   || (ahd_inb_scbram(ahd, SCB_RESIDUAL_SGPTR)
1261                       & SG_LIST_NULL) != 0)) {
1262                         u_int comp_head;
1263
1264                         /*
1265                          * The transfer completed with a residual.
1266                          * Place this SCB on the complete DMA list
1267                          * so that we update our in-core copy of the
1268                          * SCB before completing the command.
1269                          */
1270                         ahd_outb(ahd, SCB_SCSI_STATUS, 0);
1271                         ahd_outb(ahd, SCB_SGPTR,
1272                                  ahd_inb_scbram(ahd, SCB_SGPTR)
1273                                  | SG_STATUS_VALID);
1274                         ahd_outw(ahd, SCB_TAG, scbid);
1275                         ahd_outw(ahd, SCB_NEXT_COMPLETE, SCB_LIST_NULL);
1276                         comp_head = ahd_inw(ahd, COMPLETE_DMA_SCB_HEAD);
1277                         if (SCBID_IS_NULL(comp_head)) {
1278                                 ahd_outw(ahd, COMPLETE_DMA_SCB_HEAD, scbid);
1279                                 ahd_outw(ahd, COMPLETE_DMA_SCB_TAIL, scbid);
1280                         } else {
1281                                 u_int tail;
1282
1283                                 tail = ahd_inw(ahd, COMPLETE_DMA_SCB_TAIL);
1284                                 ahd_set_scbptr(ahd, tail);
1285                                 ahd_outw(ahd, SCB_NEXT_COMPLETE, scbid);
1286                                 ahd_outw(ahd, COMPLETE_DMA_SCB_TAIL, scbid);
1287                                 ahd_set_scbptr(ahd, scbid);
1288                         }
1289                 } else
1290                         ahd_complete_scb(ahd, scb);
1291         }
1292         ahd_set_scbptr(ahd, saved_scbptr);
1293
1294         /*
1295          * Setup for command channel portion of flush.
1296          */
1297         ahd_set_modes(ahd, AHD_MODE_CCHAN, AHD_MODE_CCHAN);
1298
1299         /*
1300          * Wait for any inprogress DMA to complete and clear DMA state
1301          * if this if for an SCB in the qinfifo.
1302          */
1303         while (((ccscbctl = ahd_inb(ahd, CCSCBCTL)) & (CCARREN|CCSCBEN)) != 0) {
1304
1305                 if ((ccscbctl & (CCSCBDIR|CCARREN)) == (CCSCBDIR|CCARREN)) {
1306                         if ((ccscbctl & ARRDONE) != 0)
1307                                 break;
1308                 } else if ((ccscbctl & CCSCBDONE) != 0)
1309                         break;
1310                 ahd_delay(200);
1311         }
1312         /*
1313          * We leave the sequencer to cleanup in the case of DMA's to
1314          * update the qoutfifo.  In all other cases (DMA's to the
1315          * chip or a push of an SCB from the COMPLETE_DMA_SCB list),
1316          * we disable the DMA engine so that the sequencer will not
1317          * attempt to handle the DMA completion.
1318          */
1319         if ((ccscbctl & CCSCBDIR) != 0 || (ccscbctl & ARRDONE) != 0)
1320                 ahd_outb(ahd, CCSCBCTL, ccscbctl & ~(CCARREN|CCSCBEN));
1321
1322         /*
1323          * Complete any SCBs that just finished
1324          * being DMA'ed into the qoutfifo.
1325          */
1326         ahd_run_qoutfifo(ahd);
1327
1328         saved_scbptr = ahd_get_scbptr(ahd);
1329         /*
1330          * Manually update/complete any completed SCBs that are waiting to be
1331          * DMA'ed back up to the host.
1332          */
1333         scbid = ahd_inw(ahd, COMPLETE_DMA_SCB_HEAD);
1334         while (!SCBID_IS_NULL(scbid)) {
1335                 uint8_t *hscb_ptr;
1336                 u_int    i;
1337
1338                 ahd_set_scbptr(ahd, scbid);
1339                 next_scbid = ahd_inw_scbram(ahd, SCB_NEXT_COMPLETE);
1340                 scb = ahd_lookup_scb(ahd, scbid);
1341                 if (scb == NULL) {
1342                         printf("%s: Warning - DMA-up and complete "
1343                                "SCB %d invalid\n", ahd_name(ahd), scbid);
1344                         continue;
1345                 }
1346                 hscb_ptr = (uint8_t *)scb->hscb;
1347                 for (i = 0; i < sizeof(struct hardware_scb); i++)
1348                         *hscb_ptr++ = ahd_inb_scbram(ahd, SCB_BASE + i);
1349
1350                 ahd_complete_scb(ahd, scb);
1351                 scbid = next_scbid;
1352         }
1353         ahd_outw(ahd, COMPLETE_DMA_SCB_HEAD, SCB_LIST_NULL);
1354         ahd_outw(ahd, COMPLETE_DMA_SCB_TAIL, SCB_LIST_NULL);
1355
1356         scbid = ahd_inw(ahd, COMPLETE_ON_QFREEZE_HEAD);
1357         while (!SCBID_IS_NULL(scbid)) {
1358
1359                 ahd_set_scbptr(ahd, scbid);
1360                 next_scbid = ahd_inw_scbram(ahd, SCB_NEXT_COMPLETE);
1361                 scb = ahd_lookup_scb(ahd, scbid);
1362                 if (scb == NULL) {
1363                         printf("%s: Warning - Complete Qfrz SCB %d invalid\n",
1364                                ahd_name(ahd), scbid);
1365                         continue;
1366                 }
1367
1368                 ahd_complete_scb(ahd, scb);
1369                 scbid = next_scbid;
1370         }
1371         ahd_outw(ahd, COMPLETE_ON_QFREEZE_HEAD, SCB_LIST_NULL);
1372
1373         scbid = ahd_inw(ahd, COMPLETE_SCB_HEAD);
1374         while (!SCBID_IS_NULL(scbid)) {
1375
1376                 ahd_set_scbptr(ahd, scbid);
1377                 next_scbid = ahd_inw_scbram(ahd, SCB_NEXT_COMPLETE);
1378                 scb = ahd_lookup_scb(ahd, scbid);
1379                 if (scb == NULL) {
1380                         printf("%s: Warning - Complete SCB %d invalid\n",
1381                                ahd_name(ahd), scbid);
1382                         continue;
1383                 }
1384
1385                 ahd_complete_scb(ahd, scb);
1386                 scbid = next_scbid;
1387         }
1388         ahd_outw(ahd, COMPLETE_SCB_HEAD, SCB_LIST_NULL);
1389
1390         /*
1391          * Restore state.
1392          */
1393         ahd_set_scbptr(ahd, saved_scbptr);
1394         ahd_restore_modes(ahd, saved_modes);
1395         ahd->flags |= AHD_UPDATE_PEND_CMDS;
1396 }
1397
1398 /*
1399  * Determine if an SCB for a packetized transaction
1400  * is active in a FIFO.
1401  */
1402 static int
1403 ahd_scb_active_in_fifo(struct ahd_softc *ahd, struct scb *scb)
1404 {
1405
1406         /*
1407          * The FIFO is only active for our transaction if
1408          * the SCBPTR matches the SCB's ID and the firmware
1409          * has installed a handler for the FIFO or we have
1410          * a pending SAVEPTRS or CFG4DATA interrupt.
1411          */
1412         if (ahd_get_scbptr(ahd) != SCB_GET_TAG(scb)
1413          || ((ahd_inb(ahd, LONGJMP_ADDR+1) & INVALID_ADDR) != 0
1414           && (ahd_inb(ahd, SEQINTSRC) & (CFG4DATA|SAVEPTRS)) == 0))
1415                 return (0);
1416
1417         return (1);
1418 }
1419
1420 /*
1421  * Run a data fifo to completion for a transaction we know
1422  * has completed across the SCSI bus (good status has been
1423  * received).  We are already set to the correct FIFO mode
1424  * on entry to this routine.
1425  *
1426  * This function attempts to operate exactly as the firmware
1427  * would when running this FIFO.  Care must be taken to update
1428  * this routine any time the firmware's FIFO algorithm is
1429  * changed.
1430  */
1431 static void
1432 ahd_run_data_fifo(struct ahd_softc *ahd, struct scb *scb)
1433 {
1434         u_int seqintsrc;
1435
1436         seqintsrc = ahd_inb(ahd, SEQINTSRC);
1437         if ((seqintsrc & CFG4DATA) != 0) {
1438                 uint32_t datacnt;
1439                 uint32_t sgptr;
1440
1441                 /*
1442                  * Clear full residual flag.
1443                  */
1444                 sgptr = ahd_inl_scbram(ahd, SCB_SGPTR) & ~SG_FULL_RESID;
1445                 ahd_outb(ahd, SCB_SGPTR, sgptr);
1446
1447                 /*
1448                  * Load datacnt and address.
1449                  */
1450                 datacnt = ahd_inl_scbram(ahd, SCB_DATACNT);
1451                 if ((datacnt & AHD_DMA_LAST_SEG) != 0) {
1452                         sgptr |= LAST_SEG;
1453                         ahd_outb(ahd, SG_STATE, 0);
1454                 } else
1455                         ahd_outb(ahd, SG_STATE, LOADING_NEEDED);
1456                 ahd_outq(ahd, HADDR, ahd_inq_scbram(ahd, SCB_DATAPTR));
1457                 ahd_outl(ahd, HCNT, datacnt & AHD_SG_LEN_MASK);
1458                 ahd_outb(ahd, SG_CACHE_PRE, sgptr);
1459                 ahd_outb(ahd, DFCNTRL, PRELOADEN|SCSIEN|HDMAEN);
1460
1461                 /*
1462                  * Initialize Residual Fields.
1463                  */
1464                 ahd_outb(ahd, SCB_RESIDUAL_DATACNT+3, datacnt >> 24);
1465                 ahd_outl(ahd, SCB_RESIDUAL_SGPTR, sgptr & SG_PTR_MASK);
1466
1467                 /*
1468                  * Mark the SCB as having a FIFO in use.
1469                  */
1470                 ahd_outb(ahd, SCB_FIFO_USE_COUNT,
1471                          ahd_inb_scbram(ahd, SCB_FIFO_USE_COUNT) + 1);
1472
1473                 /*
1474                  * Install a "fake" handler for this FIFO.
1475                  */
1476                 ahd_outw(ahd, LONGJMP_ADDR, 0);
1477
1478                 /*
1479                  * Notify the hardware that we have satisfied
1480                  * this sequencer interrupt.
1481                  */
1482                 ahd_outb(ahd, CLRSEQINTSRC, CLRCFG4DATA);
1483         } else if ((seqintsrc & SAVEPTRS) != 0) {
1484                 uint32_t sgptr;
1485                 uint32_t resid;
1486
1487                 if ((ahd_inb(ahd, LONGJMP_ADDR+1)&INVALID_ADDR) != 0) {
1488                         /*
1489                          * Snapshot Save Pointers.  All that
1490                          * is necessary to clear the snapshot
1491                          * is a CLRCHN.
1492                          */
1493                         goto clrchn;
1494                 }
1495
1496                 /*
1497                  * Disable S/G fetch so the DMA engine
1498                  * is available to future users.
1499                  */
1500                 if ((ahd_inb(ahd, SG_STATE) & FETCH_INPROG) != 0)
1501                         ahd_outb(ahd, CCSGCTL, 0);
1502                 ahd_outb(ahd, SG_STATE, 0);
1503
1504                 /*
1505                  * Flush the data FIFO.  Strickly only
1506                  * necessary for Rev A parts.
1507                  */
1508                 ahd_outb(ahd, DFCNTRL, ahd_inb(ahd, DFCNTRL) | FIFOFLUSH);
1509
1510                 /*
1511                  * Calculate residual.
1512                  */
1513                 sgptr = ahd_inl_scbram(ahd, SCB_RESIDUAL_SGPTR);
1514                 resid = ahd_inl(ahd, SHCNT);
1515                 resid |= ahd_inb_scbram(ahd, SCB_RESIDUAL_DATACNT+3) << 24;
1516                 ahd_outl(ahd, SCB_RESIDUAL_DATACNT, resid);
1517                 if ((ahd_inb(ahd, SG_CACHE_SHADOW) & LAST_SEG) == 0) {
1518                         /*
1519                          * Must back up to the correct S/G element.
1520                          * Typically this just means resetting our
1521                          * low byte to the offset in the SG_CACHE,
1522                          * but if we wrapped, we have to correct
1523                          * the other bytes of the sgptr too.
1524                          */
1525                         if ((ahd_inb(ahd, SG_CACHE_SHADOW) & 0x80) != 0
1526                          && (sgptr & 0x80) == 0)
1527                                 sgptr -= 0x100;
1528                         sgptr &= ~0xFF;
1529                         sgptr |= ahd_inb(ahd, SG_CACHE_SHADOW)
1530                                & SG_ADDR_MASK;
1531                         ahd_outl(ahd, SCB_RESIDUAL_SGPTR, sgptr);
1532                         ahd_outb(ahd, SCB_RESIDUAL_DATACNT + 3, 0);
1533                 } else if ((resid & AHD_SG_LEN_MASK) == 0) {
1534                         ahd_outb(ahd, SCB_RESIDUAL_SGPTR,
1535                                  sgptr | SG_LIST_NULL);
1536                 }
1537                 /*
1538                  * Save Pointers.
1539                  */
1540                 ahd_outq(ahd, SCB_DATAPTR, ahd_inq(ahd, SHADDR));
1541                 ahd_outl(ahd, SCB_DATACNT, resid);
1542                 ahd_outl(ahd, SCB_SGPTR, sgptr);
1543                 ahd_outb(ahd, CLRSEQINTSRC, CLRSAVEPTRS);
1544                 ahd_outb(ahd, SEQIMODE,
1545                          ahd_inb(ahd, SEQIMODE) | ENSAVEPTRS);
1546                 /*
1547                  * If the data is to the SCSI bus, we are
1548                  * done, otherwise wait for FIFOEMP.
1549                  */
1550                 if ((ahd_inb(ahd, DFCNTRL) & DIRECTION) != 0)
1551                         goto clrchn;
1552         } else if ((ahd_inb(ahd, SG_STATE) & LOADING_NEEDED) != 0) {
1553                 uint32_t sgptr;
1554                 uint64_t data_addr;
1555                 uint32_t data_len;
1556                 u_int    dfcntrl;
1557
1558                 /*
1559                  * Disable S/G fetch so the DMA engine
1560                  * is available to future users.  We won't
1561                  * be using the DMA engine to load segments.
1562                  */
1563                 if ((ahd_inb(ahd, SG_STATE) & FETCH_INPROG) != 0) {
1564                         ahd_outb(ahd, CCSGCTL, 0);
1565                         ahd_outb(ahd, SG_STATE, LOADING_NEEDED);
1566                 }
1567
1568                 /*
1569                  * Wait for the DMA engine to notice that the
1570                  * host transfer is enabled and that there is
1571                  * space in the S/G FIFO for new segments before
1572                  * loading more segments.
1573                  */
1574                 if ((ahd_inb(ahd, DFSTATUS) & PRELOAD_AVAIL) != 0
1575                  && (ahd_inb(ahd, DFCNTRL) & HDMAENACK) != 0) {
1576
1577                         /*
1578                          * Determine the offset of the next S/G
1579                          * element to load.
1580                          */
1581                         sgptr = ahd_inl_scbram(ahd, SCB_RESIDUAL_SGPTR);
1582                         sgptr &= SG_PTR_MASK;
1583                         if ((ahd->flags & AHD_64BIT_ADDRESSING) != 0) {
1584                                 struct ahd_dma64_seg *sg;
1585
1586                                 sg = ahd_sg_bus_to_virt(ahd, scb, sgptr);
1587                                 data_addr = sg->addr;
1588                                 data_len = sg->len;
1589                                 sgptr += sizeof(*sg);
1590                         } else {
1591                                 struct  ahd_dma_seg *sg;
1592
1593                                 sg = ahd_sg_bus_to_virt(ahd, scb, sgptr);
1594                                 data_addr = sg->len & AHD_SG_HIGH_ADDR_MASK;
1595                                 data_addr <<= 8;
1596                                 data_addr |= sg->addr;
1597                                 data_len = sg->len;
1598                                 sgptr += sizeof(*sg);
1599                         }
1600
1601                         /*
1602                          * Update residual information.
1603                          */
1604                         ahd_outb(ahd, SCB_RESIDUAL_DATACNT+3, data_len >> 24);
1605                         ahd_outl(ahd, SCB_RESIDUAL_SGPTR, sgptr);
1606
1607                         /*
1608                          * Load the S/G.
1609                          */
1610                         if (data_len & AHD_DMA_LAST_SEG) {
1611                                 sgptr |= LAST_SEG;
1612                                 ahd_outb(ahd, SG_STATE, 0);
1613                         }
1614                         ahd_outq(ahd, HADDR, data_addr);
1615                         ahd_outl(ahd, HCNT, data_len & AHD_SG_LEN_MASK);
1616                         ahd_outb(ahd, SG_CACHE_PRE, sgptr & 0xFF);
1617
1618                         /*
1619                          * Advertise the segment to the hardware.
1620                          */
1621                         dfcntrl = ahd_inb(ahd, DFCNTRL)|PRELOADEN|HDMAEN;
1622                         if ((ahd->features & AHD_NEW_DFCNTRL_OPTS) != 0) {
1623                                 /*
1624                                  * Use SCSIENWRDIS so that SCSIEN
1625                                  * is never modified by this
1626                                  * operation.
1627                                  */
1628                                 dfcntrl |= SCSIENWRDIS;
1629                         }
1630                         ahd_outb(ahd, DFCNTRL, dfcntrl);
1631                 }
1632         } else if ((ahd_inb(ahd, SG_CACHE_SHADOW) & LAST_SEG_DONE) != 0) {
1633
1634                 /*
1635                  * Transfer completed to the end of SG list
1636                  * and has flushed to the host.
1637                  */
1638                 ahd_outb(ahd, SCB_SGPTR,
1639                          ahd_inb_scbram(ahd, SCB_SGPTR) | SG_LIST_NULL);
1640                 goto clrchn;
1641         } else if ((ahd_inb(ahd, DFSTATUS) & FIFOEMP) != 0) {
1642 clrchn:
1643                 /*
1644                  * Clear any handler for this FIFO, decrement
1645                  * the FIFO use count for the SCB, and release
1646                  * the FIFO.
1647                  */
1648                 ahd_outb(ahd, LONGJMP_ADDR + 1, INVALID_ADDR);
1649                 ahd_outb(ahd, SCB_FIFO_USE_COUNT,
1650                          ahd_inb_scbram(ahd, SCB_FIFO_USE_COUNT) - 1);
1651                 ahd_outb(ahd, DFFSXFRCTL, CLRCHN);
1652         }
1653 }
1654
1655 /*
1656  * Look for entries in the QoutFIFO that have completed.
1657  * The valid_tag completion field indicates the validity
1658  * of the entry - the valid value toggles each time through
1659  * the queue. We use the sg_status field in the completion
1660  * entry to avoid referencing the hscb if the completion
1661  * occurred with no errors and no residual.  sg_status is
1662  * a copy of the first byte (little endian) of the sgptr
1663  * hscb field.
1664  */
1665 static void
1666 ahd_run_qoutfifo(struct ahd_softc *ahd)
1667 {
1668         struct ahd_completion *completion;
1669         struct scb *scb;
1670         u_int  scb_index;
1671
1672         if ((ahd->flags & AHD_RUNNING_QOUTFIFO) != 0)
1673                 panic("ahd_run_qoutfifo recursion");
1674         ahd->flags |= AHD_RUNNING_QOUTFIFO;
1675         ahd_sync_qoutfifo(ahd, BUS_DMASYNC_POSTREAD);
1676         for (;;) {
1677                 completion = &ahd->qoutfifo[ahd->qoutfifonext];
1678
1679                 if (completion->valid_tag != ahd->qoutfifonext_valid_tag)
1680                         break;
1681
1682                 scb_index = ahd_le16toh(completion->tag);
1683                 scb = ahd_lookup_scb(ahd, scb_index);
1684                 if (scb == NULL) {
1685                         printf("%s: WARNING no command for scb %d "
1686                                "(cmdcmplt)\nQOUTPOS = %d\n",
1687                                ahd_name(ahd), scb_index,
1688                                ahd->qoutfifonext);
1689                         ahd_dump_card_state(ahd);
1690                 } else if ((completion->sg_status & SG_STATUS_VALID) != 0) {
1691                         ahd_handle_scb_status(ahd, scb);
1692                 } else {
1693                         ahd_done(ahd, scb);
1694                 }
1695
1696                 ahd->qoutfifonext = (ahd->qoutfifonext+1) & (AHD_QOUT_SIZE-1);
1697                 if (ahd->qoutfifonext == 0)
1698                         ahd->qoutfifonext_valid_tag ^= QOUTFIFO_ENTRY_VALID;
1699         }
1700         ahd->flags &= ~AHD_RUNNING_QOUTFIFO;
1701 }
1702
1703 /************************* Interrupt Handling *********************************/
1704 static void
1705 ahd_handle_hwerrint(struct ahd_softc *ahd)
1706 {
1707         /*
1708          * Some catastrophic hardware error has occurred.
1709          * Print it for the user and disable the controller.
1710          */
1711         int i;
1712         int error;
1713
1714         error = ahd_inb(ahd, ERROR);
1715         for (i = 0; i < num_errors; i++) {
1716                 if ((error & ahd_hard_errors[i].errno) != 0)
1717                         printf("%s: hwerrint, %s\n",
1718                                ahd_name(ahd), ahd_hard_errors[i].errmesg);
1719         }
1720
1721         ahd_dump_card_state(ahd);
1722         panic("BRKADRINT");
1723
1724         /* Tell everyone that this HBA is no longer available */
1725         ahd_abort_scbs(ahd, CAM_TARGET_WILDCARD, ALL_CHANNELS,
1726                        CAM_LUN_WILDCARD, SCB_LIST_NULL, ROLE_UNKNOWN,
1727                        CAM_NO_HBA);
1728
1729         /* Tell the system that this controller has gone away. */
1730         ahd_free(ahd);
1731 }
1732
1733 #ifdef AHD_DEBUG
1734 static void
1735 ahd_dump_sglist(struct scb *scb)
1736 {
1737         int i;
1738
1739         if (scb->sg_count > 0) {
1740                 if ((scb->ahd_softc->flags & AHD_64BIT_ADDRESSING) != 0) {
1741                         struct ahd_dma64_seg *sg_list;
1742
1743                         sg_list = (struct ahd_dma64_seg*)scb->sg_list;
1744                         for (i = 0; i < scb->sg_count; i++) {
1745                                 uint64_t addr;
1746                                 uint32_t len;
1747
1748                                 addr = ahd_le64toh(sg_list[i].addr);
1749                                 len = ahd_le32toh(sg_list[i].len);
1750                                 printf("sg[%d] - Addr 0x%x%x : Length %d%s\n",
1751                                        i,
1752                                        (uint32_t)((addr >> 32) & 0xFFFFFFFF),
1753                                        (uint32_t)(addr & 0xFFFFFFFF),
1754                                        sg_list[i].len & AHD_SG_LEN_MASK,
1755                                        (sg_list[i].len & AHD_DMA_LAST_SEG)
1756                                      ? " Last" : "");
1757                         }
1758                 } else {
1759                         struct ahd_dma_seg *sg_list;
1760
1761                         sg_list = (struct ahd_dma_seg*)scb->sg_list;
1762                         for (i = 0; i < scb->sg_count; i++) {
1763                                 uint32_t len;
1764
1765                                 len = ahd_le32toh(sg_list[i].len);
1766                                 printf("sg[%d] - Addr 0x%x%x : Length %d%s\n",
1767                                        i,
1768                                        (len & AHD_SG_HIGH_ADDR_MASK) >> 24,
1769                                        ahd_le32toh(sg_list[i].addr),
1770                                        len & AHD_SG_LEN_MASK,
1771                                        len & AHD_DMA_LAST_SEG ? " Last" : "");
1772                         }
1773                 }
1774         }
1775 }
1776 #endif  /*  AHD_DEBUG  */
1777
1778 static void
1779 ahd_handle_seqint(struct ahd_softc *ahd, u_int intstat)
1780 {
1781         u_int seqintcode;
1782
1783         /*
1784          * Save the sequencer interrupt code and clear the SEQINT
1785          * bit. We will unpause the sequencer, if appropriate,
1786          * after servicing the request.
1787          */
1788         seqintcode = ahd_inb(ahd, SEQINTCODE);
1789         ahd_outb(ahd, CLRINT, CLRSEQINT);
1790         if ((ahd->bugs & AHD_INTCOLLISION_BUG) != 0) {
1791                 /*
1792                  * Unpause the sequencer and let it clear
1793                  * SEQINT by writing NO_SEQINT to it.  This
1794                  * will cause the sequencer to be paused again,
1795                  * which is the expected state of this routine.
1796                  */
1797                 ahd_unpause(ahd);
1798                 while (!ahd_is_paused(ahd))
1799                         ;
1800                 ahd_outb(ahd, CLRINT, CLRSEQINT);
1801         }
1802         ahd_update_modes(ahd);
1803 #ifdef AHD_DEBUG
1804         if ((ahd_debug & AHD_SHOW_MISC) != 0)
1805                 printf("%s: Handle Seqint Called for code %d\n",
1806                        ahd_name(ahd), seqintcode);
1807 #endif
1808         switch (seqintcode) {
1809         case ENTERING_NONPACK:
1810         {
1811                 struct  scb *scb;
1812                 u_int   scbid;
1813
1814                 AHD_ASSERT_MODES(ahd, ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK),
1815                                  ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK));
1816                 scbid = ahd_get_scbptr(ahd);
1817                 scb = ahd_lookup_scb(ahd, scbid);
1818                 if (scb == NULL) {
1819                         /*
1820                          * Somehow need to know if this
1821                          * is from a selection or reselection.
1822                          * From that, we can determine target
1823                          * ID so we at least have an I_T nexus.
1824                          */
1825                 } else {
1826                         ahd_outb(ahd, SAVED_SCSIID, scb->hscb->scsiid);
1827                         ahd_outb(ahd, SAVED_LUN, scb->hscb->lun);
1828                         ahd_outb(ahd, SEQ_FLAGS, 0x0);
1829                 }
1830                 if ((ahd_inb(ahd, LQISTAT2) & LQIPHASE_OUTPKT) != 0
1831                  && (ahd_inb(ahd, SCSISIGO) & ATNO) != 0) {
1832                         /*
1833                          * Phase change after read stream with
1834                          * CRC error with P0 asserted on last
1835                          * packet.
1836                          */
1837 #ifdef AHD_DEBUG
1838                         if ((ahd_debug & AHD_SHOW_RECOVERY) != 0)
1839                                 printf("%s: Assuming LQIPHASE_NLQ with "
1840                                        "P0 assertion\n", ahd_name(ahd));
1841 #endif
1842                 }
1843 #ifdef AHD_DEBUG
1844                 if ((ahd_debug & AHD_SHOW_RECOVERY) != 0)
1845                         printf("%s: Entering NONPACK\n", ahd_name(ahd));
1846 #endif
1847                 break;
1848         }
1849         case INVALID_SEQINT:
1850                 printf("%s: Invalid Sequencer interrupt occurred, "
1851                        "resetting channel.\n",
1852                        ahd_name(ahd));
1853 #ifdef AHD_DEBUG
1854                 if ((ahd_debug & AHD_SHOW_RECOVERY) != 0)
1855                         ahd_dump_card_state(ahd);
1856 #endif
1857                 ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
1858                 break;
1859         case STATUS_OVERRUN:
1860         {
1861                 struct  scb *scb;
1862                 u_int   scbid;
1863
1864                 scbid = ahd_get_scbptr(ahd);
1865                 scb = ahd_lookup_scb(ahd, scbid);
1866                 if (scb != NULL)
1867                         ahd_print_path(ahd, scb);
1868                 else
1869                         printf("%s: ", ahd_name(ahd));
1870                 printf("SCB %d Packetized Status Overrun", scbid);
1871                 ahd_dump_card_state(ahd);
1872                 ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
1873                 break;
1874         }
1875         case CFG4ISTAT_INTR:
1876         {
1877                 struct  scb *scb;
1878                 u_int   scbid;
1879
1880                 scbid = ahd_get_scbptr(ahd);
1881                 scb = ahd_lookup_scb(ahd, scbid);
1882                 if (scb == NULL) {
1883                         ahd_dump_card_state(ahd);
1884                         printf("CFG4ISTAT: Free SCB %d referenced", scbid);
1885                         panic("For safety");
1886                 }
1887                 ahd_outq(ahd, HADDR, scb->sense_busaddr);
1888                 ahd_outw(ahd, HCNT, AHD_SENSE_BUFSIZE);
1889                 ahd_outb(ahd, HCNT + 2, 0);
1890                 ahd_outb(ahd, SG_CACHE_PRE, SG_LAST_SEG);
1891                 ahd_outb(ahd, DFCNTRL, PRELOADEN|SCSIEN|HDMAEN);
1892                 break;
1893         }
1894         case ILLEGAL_PHASE:
1895         {
1896                 u_int bus_phase;
1897
1898                 bus_phase = ahd_inb(ahd, SCSISIGI) & PHASE_MASK;
1899                 printf("%s: ILLEGAL_PHASE 0x%x\n",
1900                        ahd_name(ahd), bus_phase);
1901
1902                 switch (bus_phase) {
1903                 case P_DATAOUT:
1904                 case P_DATAIN:
1905                 case P_DATAOUT_DT:
1906                 case P_DATAIN_DT:
1907                 case P_MESGOUT:
1908                 case P_STATUS:
1909                 case P_MESGIN:
1910                         ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
1911                         printf("%s: Issued Bus Reset.\n", ahd_name(ahd));
1912                         break;
1913                 case P_COMMAND:
1914                 {
1915                         struct  ahd_devinfo devinfo;
1916                         struct  scb *scb;
1917                         struct  ahd_initiator_tinfo *targ_info;
1918                         struct  ahd_tmode_tstate *tstate;
1919                         struct  ahd_transinfo *tinfo;
1920                         u_int   scbid;
1921
1922                         /*
1923                          * If a target takes us into the command phase
1924                          * assume that it has been externally reset and
1925                          * has thus lost our previous packetized negotiation
1926                          * agreement.  Since we have not sent an identify
1927                          * message and may not have fully qualified the
1928                          * connection, we change our command to TUR, assert
1929                          * ATN and ABORT the task when we go to message in
1930                          * phase.  The OSM will see the REQUEUE_REQUEST
1931                          * status and retry the command.
1932                          */
1933                         scbid = ahd_get_scbptr(ahd);
1934                         scb = ahd_lookup_scb(ahd, scbid);
1935                         if (scb == NULL) {
1936                                 printf("Invalid phase with no valid SCB.  "
1937                                        "Resetting bus.\n");
1938                                 ahd_reset_channel(ahd, 'A',
1939                                                   /*Initiate Reset*/TRUE);
1940                                 break;
1941                         }
1942                         ahd_compile_devinfo(&devinfo, SCB_GET_OUR_ID(scb),
1943                                             SCB_GET_TARGET(ahd, scb),
1944                                             SCB_GET_LUN(scb),
1945                                             SCB_GET_CHANNEL(ahd, scb),
1946                                             ROLE_INITIATOR);
1947                         targ_info = ahd_fetch_transinfo(ahd,
1948                                                         devinfo.channel,
1949                                                         devinfo.our_scsiid,
1950                                                         devinfo.target,
1951                                                         &tstate);
1952                         tinfo = &targ_info->curr;
1953                         ahd_set_width(ahd, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
1954                                       AHD_TRANS_ACTIVE, /*paused*/TRUE);
1955                         ahd_set_syncrate(ahd, &devinfo, /*period*/0,
1956                                          /*offset*/0, /*ppr_options*/0,
1957                                          AHD_TRANS_ACTIVE, /*paused*/TRUE);
1958                         /* Hand-craft TUR command */
1959                         ahd_outb(ahd, SCB_CDB_STORE, 0);
1960                         ahd_outb(ahd, SCB_CDB_STORE+1, 0);
1961                         ahd_outb(ahd, SCB_CDB_STORE+2, 0);
1962                         ahd_outb(ahd, SCB_CDB_STORE+3, 0);
1963                         ahd_outb(ahd, SCB_CDB_STORE+4, 0);
1964                         ahd_outb(ahd, SCB_CDB_STORE+5, 0);
1965                         ahd_outb(ahd, SCB_CDB_LEN, 6);
1966                         scb->hscb->control &= ~(TAG_ENB|SCB_TAG_TYPE);
1967                         scb->hscb->control |= MK_MESSAGE;
1968                         ahd_outb(ahd, SCB_CONTROL, scb->hscb->control);
1969                         ahd_outb(ahd, MSG_OUT, HOST_MSG);
1970                         ahd_outb(ahd, SAVED_SCSIID, scb->hscb->scsiid);
1971                         /*
1972                          * The lun is 0, regardless of the SCB's lun
1973                          * as we have not sent an identify message.
1974                          */
1975                         ahd_outb(ahd, SAVED_LUN, 0);
1976                         ahd_outb(ahd, SEQ_FLAGS, 0);
1977                         ahd_assert_atn(ahd);
1978                         scb->flags &= ~SCB_PACKETIZED;
1979                         scb->flags |= SCB_ABORT|SCB_EXTERNAL_RESET;
1980                         ahd_freeze_devq(ahd, scb);
1981                         ahd_set_transaction_status(scb, CAM_REQUEUE_REQ);
1982                         ahd_freeze_scb(scb);
1983
1984                         /* Notify XPT */
1985                         ahd_send_async(ahd, devinfo.channel, devinfo.target,
1986                                        CAM_LUN_WILDCARD, AC_SENT_BDR);
1987
1988                         /*
1989                          * Allow the sequencer to continue with
1990                          * non-pack processing.
1991                          */
1992                         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
1993                         ahd_outb(ahd, CLRLQOINT1, CLRLQOPHACHGINPKT);
1994                         if ((ahd->bugs & AHD_CLRLQO_AUTOCLR_BUG) != 0) {
1995                                 ahd_outb(ahd, CLRLQOINT1, 0);
1996                         }
1997 #ifdef AHD_DEBUG
1998                         if ((ahd_debug & AHD_SHOW_RECOVERY) != 0) {
1999                                 ahd_print_path(ahd, scb);
2000                                 printf("Unexpected command phase from "
2001                                        "packetized target\n");
2002                         }
2003 #endif
2004                         break;
2005                 }
2006                 }
2007                 break;
2008         }
2009         case CFG4OVERRUN:
2010         {
2011                 struct  scb *scb;
2012                 u_int   scb_index;
2013
2014 #ifdef AHD_DEBUG
2015                 if ((ahd_debug & AHD_SHOW_RECOVERY) != 0) {
2016                         printf("%s: CFG4OVERRUN mode = %x\n", ahd_name(ahd),
2017                                ahd_inb(ahd, MODE_PTR));
2018                 }
2019 #endif
2020                 scb_index = ahd_get_scbptr(ahd);
2021                 scb = ahd_lookup_scb(ahd, scb_index);
2022                 if (scb == NULL) {
2023                         /*
2024                          * Attempt to transfer to an SCB that is
2025                          * not outstanding.
2026                          */
2027                         ahd_assert_atn(ahd);
2028                         ahd_outb(ahd, MSG_OUT, HOST_MSG);
2029                         ahd->msgout_buf[0] = MSG_ABORT_TASK;
2030                         ahd->msgout_len = 1;
2031                         ahd->msgout_index = 0;
2032                         ahd->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
2033                         /*
2034                          * Clear status received flag to prevent any
2035                          * attempt to complete this bogus SCB.
2036                          */
2037                         ahd_outb(ahd, SCB_CONTROL,
2038                                  ahd_inb_scbram(ahd, SCB_CONTROL)
2039                                  & ~STATUS_RCVD);
2040                 }
2041                 break;
2042         }
2043         case DUMP_CARD_STATE:
2044         {
2045                 ahd_dump_card_state(ahd);
2046                 break;
2047         }
2048         case PDATA_REINIT:
2049         {
2050 #ifdef AHD_DEBUG
2051                 if ((ahd_debug & AHD_SHOW_RECOVERY) != 0) {
2052                         printf("%s: PDATA_REINIT - DFCNTRL = 0x%x "
2053                                "SG_CACHE_SHADOW = 0x%x\n",
2054                                ahd_name(ahd), ahd_inb(ahd, DFCNTRL),
2055                                ahd_inb(ahd, SG_CACHE_SHADOW));
2056                 }
2057 #endif
2058                 ahd_reinitialize_dataptrs(ahd);
2059                 break;
2060         }
2061         case HOST_MSG_LOOP:
2062         {
2063                 struct ahd_devinfo devinfo;
2064
2065                 /*
2066                  * The sequencer has encountered a message phase
2067                  * that requires host assistance for completion.
2068                  * While handling the message phase(s), we will be
2069                  * notified by the sequencer after each byte is
2070                  * transfered so we can track bus phase changes.
2071                  *
2072                  * If this is the first time we've seen a HOST_MSG_LOOP
2073                  * interrupt, initialize the state of the host message
2074                  * loop.
2075                  */
2076                 ahd_fetch_devinfo(ahd, &devinfo);
2077                 if (ahd->msg_type == MSG_TYPE_NONE) {
2078                         struct scb *scb;
2079                         u_int scb_index;
2080                         u_int bus_phase;
2081
2082                         bus_phase = ahd_inb(ahd, SCSISIGI) & PHASE_MASK;
2083                         if (bus_phase != P_MESGIN
2084                          && bus_phase != P_MESGOUT) {
2085                                 printf("ahd_intr: HOST_MSG_LOOP bad "
2086                                        "phase 0x%x\n", bus_phase);
2087                                 /*
2088                                  * Probably transitioned to bus free before
2089                                  * we got here.  Just punt the message.
2090                                  */
2091                                 ahd_dump_card_state(ahd);
2092                                 ahd_clear_intstat(ahd);
2093                                 ahd_restart(ahd);
2094                                 return;
2095                         }
2096
2097                         scb_index = ahd_get_scbptr(ahd);
2098                         scb = ahd_lookup_scb(ahd, scb_index);
2099                         if (devinfo.role == ROLE_INITIATOR) {
2100                                 if (bus_phase == P_MESGOUT)
2101                                         ahd_setup_initiator_msgout(ahd,
2102                                                                    &devinfo,
2103                                                                    scb);
2104                                 else {
2105                                         ahd->msg_type =
2106                                             MSG_TYPE_INITIATOR_MSGIN;
2107                                         ahd->msgin_index = 0;
2108                                 }
2109                         }
2110 #ifdef AHD_TARGET_MODE
2111                         else {
2112                                 if (bus_phase == P_MESGOUT) {
2113                                         ahd->msg_type =
2114                                             MSG_TYPE_TARGET_MSGOUT;
2115                                         ahd->msgin_index = 0;
2116                                 }
2117                                 else
2118                                         ahd_setup_target_msgin(ahd,
2119                                                                &devinfo,
2120                                                                scb);
2121                         }
2122 #endif
2123                 }
2124
2125                 ahd_handle_message_phase(ahd);
2126                 break;
2127         }
2128         case NO_MATCH:
2129         {
2130                 /* Ensure we don't leave the selection hardware on */
2131                 AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
2132                 ahd_outb(ahd, SCSISEQ0, ahd_inb(ahd, SCSISEQ0) & ~ENSELO);
2133
2134                 printf("%s:%c:%d: no active SCB for reconnecting "
2135                        "target - issuing BUS DEVICE RESET\n",
2136                        ahd_name(ahd), 'A', ahd_inb(ahd, SELID) >> 4);
2137                 printf("SAVED_SCSIID == 0x%x, SAVED_LUN == 0x%x, "
2138                        "REG0 == 0x%x ACCUM = 0x%x\n",
2139                        ahd_inb(ahd, SAVED_SCSIID), ahd_inb(ahd, SAVED_LUN),
2140                        ahd_inw(ahd, REG0), ahd_inb(ahd, ACCUM));
2141                 printf("SEQ_FLAGS == 0x%x, SCBPTR == 0x%x, BTT == 0x%x, "
2142                        "SINDEX == 0x%x\n",
2143                        ahd_inb(ahd, SEQ_FLAGS), ahd_get_scbptr(ahd),
2144                        ahd_find_busy_tcl(ahd,
2145                                          BUILD_TCL(ahd_inb(ahd, SAVED_SCSIID),
2146                                                    ahd_inb(ahd, SAVED_LUN))),
2147                        ahd_inw(ahd, SINDEX));
2148                 printf("SELID == 0x%x, SCB_SCSIID == 0x%x, SCB_LUN == 0x%x, "
2149                        "SCB_CONTROL == 0x%x\n",
2150                        ahd_inb(ahd, SELID), ahd_inb_scbram(ahd, SCB_SCSIID),
2151                        ahd_inb_scbram(ahd, SCB_LUN),
2152                        ahd_inb_scbram(ahd, SCB_CONTROL));
2153                 printf("SCSIBUS[0] == 0x%x, SCSISIGI == 0x%x\n",
2154                        ahd_inb(ahd, SCSIBUS), ahd_inb(ahd, SCSISIGI));
2155                 printf("SXFRCTL0 == 0x%x\n", ahd_inb(ahd, SXFRCTL0));
2156                 printf("SEQCTL0 == 0x%x\n", ahd_inb(ahd, SEQCTL0));
2157                 ahd_dump_card_state(ahd);
2158                 ahd->msgout_buf[0] = MSG_BUS_DEV_RESET;
2159                 ahd->msgout_len = 1;
2160                 ahd->msgout_index = 0;
2161                 ahd->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
2162                 ahd_outb(ahd, MSG_OUT, HOST_MSG);
2163                 ahd_assert_atn(ahd);
2164                 break;
2165         }
2166         case PROTO_VIOLATION:
2167         {
2168                 ahd_handle_proto_violation(ahd);
2169                 break;
2170         }
2171         case IGN_WIDE_RES:
2172         {
2173                 struct ahd_devinfo devinfo;
2174
2175                 ahd_fetch_devinfo(ahd, &devinfo);
2176                 ahd_handle_ign_wide_residue(ahd, &devinfo);
2177                 break;
2178         }
2179         case BAD_PHASE:
2180         {
2181                 u_int lastphase;
2182
2183                 lastphase = ahd_inb(ahd, LASTPHASE);
2184                 printf("%s:%c:%d: unknown scsi bus phase %x, "
2185                        "lastphase = 0x%x.  Attempting to continue\n",
2186                        ahd_name(ahd), 'A',
2187                        SCSIID_TARGET(ahd, ahd_inb(ahd, SAVED_SCSIID)),
2188                        lastphase, ahd_inb(ahd, SCSISIGI));
2189                 break;
2190         }
2191         case MISSED_BUSFREE:
2192         {
2193                 u_int lastphase;
2194
2195                 lastphase = ahd_inb(ahd, LASTPHASE);
2196                 printf("%s:%c:%d: Missed busfree. "
2197                        "Lastphase = 0x%x, Curphase = 0x%x\n",
2198                        ahd_name(ahd), 'A',
2199                        SCSIID_TARGET(ahd, ahd_inb(ahd, SAVED_SCSIID)),
2200                        lastphase, ahd_inb(ahd, SCSISIGI));
2201                 ahd_restart(ahd);
2202                 return;
2203         }
2204         case DATA_OVERRUN:
2205         {
2206                 /*
2207                  * When the sequencer detects an overrun, it
2208                  * places the controller in "BITBUCKET" mode
2209                  * and allows the target to complete its transfer.
2210                  * Unfortunately, none of the counters get updated
2211                  * when the controller is in this mode, so we have
2212                  * no way of knowing how large the overrun was.
2213                  */
2214                 struct  scb *scb;
2215                 u_int   scbindex;
2216 #ifdef AHD_DEBUG
2217                 u_int   lastphase;
2218 #endif
2219
2220                 scbindex = ahd_get_scbptr(ahd);
2221                 scb = ahd_lookup_scb(ahd, scbindex);
2222 #ifdef AHD_DEBUG
2223                 lastphase = ahd_inb(ahd, LASTPHASE);
2224                 if ((ahd_debug & AHD_SHOW_RECOVERY) != 0) {
2225                         ahd_print_path(ahd, scb);
2226                         printf("data overrun detected %s.  Tag == 0x%x.\n",
2227                                ahd_lookup_phase_entry(lastphase)->phasemsg,
2228                                SCB_GET_TAG(scb));
2229                         ahd_print_path(ahd, scb);
2230                         printf("%s seen Data Phase.  Length = %ld.  "
2231                                "NumSGs = %d.\n",
2232                                ahd_inb(ahd, SEQ_FLAGS) & DPHASE
2233                                ? "Have" : "Haven't",
2234                                ahd_get_transfer_length(scb), scb->sg_count);
2235                         ahd_dump_sglist(scb);
2236                 }
2237 #endif
2238
2239                 /*
2240                  * Set this and it will take effect when the
2241                  * target does a command complete.
2242                  */
2243                 ahd_freeze_devq(ahd, scb);
2244                 ahd_set_transaction_status(scb, CAM_DATA_RUN_ERR);
2245                 ahd_freeze_scb(scb);
2246                 break;
2247         }
2248         case MKMSG_FAILED:
2249         {
2250                 struct ahd_devinfo devinfo;
2251                 struct scb *scb;
2252                 u_int scbid;
2253
2254                 ahd_fetch_devinfo(ahd, &devinfo);
2255                 printf("%s:%c:%d:%d: Attempt to issue message failed\n",
2256                        ahd_name(ahd), devinfo.channel, devinfo.target,
2257                        devinfo.lun);
2258                 scbid = ahd_get_scbptr(ahd);
2259                 scb = ahd_lookup_scb(ahd, scbid);
2260                 if (scb != NULL
2261                  && (scb->flags & SCB_RECOVERY_SCB) != 0)
2262                         /*
2263                          * Ensure that we didn't put a second instance of this
2264                          * SCB into the QINFIFO.
2265                          */
2266                         ahd_search_qinfifo(ahd, SCB_GET_TARGET(ahd, scb),
2267                                            SCB_GET_CHANNEL(ahd, scb),
2268                                            SCB_GET_LUN(scb), SCB_GET_TAG(scb),
2269                                            ROLE_INITIATOR, /*status*/0,
2270                                            SEARCH_REMOVE);
2271                 ahd_outb(ahd, SCB_CONTROL,
2272                          ahd_inb_scbram(ahd, SCB_CONTROL) & ~MK_MESSAGE);
2273                 break;
2274         }
2275         case TASKMGMT_FUNC_COMPLETE:
2276         {
2277                 u_int   scbid;
2278                 struct  scb *scb;
2279
2280                 scbid = ahd_get_scbptr(ahd);
2281                 scb = ahd_lookup_scb(ahd, scbid);
2282                 if (scb != NULL) {
2283                         u_int      lun;
2284                         u_int      tag;
2285                         cam_status error;
2286
2287                         ahd_print_path(ahd, scb);
2288                         printf("Task Management Func 0x%x Complete\n",
2289                                scb->hscb->task_management);
2290                         lun = CAM_LUN_WILDCARD;
2291                         tag = SCB_LIST_NULL;
2292
2293                         switch (scb->hscb->task_management) {
2294                         case SIU_TASKMGMT_ABORT_TASK:
2295                                 tag = SCB_GET_TAG(scb);
2296                         case SIU_TASKMGMT_ABORT_TASK_SET:
2297                         case SIU_TASKMGMT_CLEAR_TASK_SET:
2298                                 lun = scb->hscb->lun;
2299                                 error = CAM_REQ_ABORTED;
2300                                 ahd_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb),
2301                                                'A', lun, tag, ROLE_INITIATOR,
2302                                                error);
2303                                 break;
2304                         case SIU_TASKMGMT_LUN_RESET:
2305                                 lun = scb->hscb->lun;
2306                         case SIU_TASKMGMT_TARGET_RESET:
2307                         {
2308                                 struct ahd_devinfo devinfo;
2309
2310                                 ahd_scb_devinfo(ahd, &devinfo, scb);
2311                                 error = CAM_BDR_SENT;
2312                                 ahd_handle_devreset(ahd, &devinfo, lun,
2313                                                     CAM_BDR_SENT,
2314                                                     lun != CAM_LUN_WILDCARD
2315                                                     ? "Lun Reset"
2316                                                     : "Target Reset",
2317                                                     /*verbose_level*/0);
2318                                 break;
2319                         }
2320                         default:
2321                                 panic("Unexpected TaskMgmt Func\n");
2322                                 break;
2323                         }
2324                 }
2325                 break;
2326         }
2327         case TASKMGMT_CMD_CMPLT_OKAY:
2328         {
2329                 u_int   scbid;
2330                 struct  scb *scb;
2331
2332                 /*
2333                  * An ABORT TASK TMF failed to be delivered before
2334                  * the targeted command completed normally.
2335                  */
2336                 scbid = ahd_get_scbptr(ahd);
2337                 scb = ahd_lookup_scb(ahd, scbid);
2338                 if (scb != NULL) {
2339                         /*
2340                          * Remove the second instance of this SCB from
2341                          * the QINFIFO if it is still there.
2342                          */
2343                         ahd_print_path(ahd, scb);
2344                         printf("SCB completes before TMF\n");
2345                         /*
2346                          * Handle losing the race.  Wait until any
2347                          * current selection completes.  We will then
2348                          * set the TMF back to zero in this SCB so that
2349                          * the sequencer doesn't bother to issue another
2350                          * sequencer interrupt for its completion.
2351                          */
2352                         while ((ahd_inb(ahd, SCSISEQ0) & ENSELO) != 0
2353                             && (ahd_inb(ahd, SSTAT0) & SELDO) == 0
2354                             && (ahd_inb(ahd, SSTAT1) & SELTO) == 0)
2355                                 ;
2356                         ahd_outb(ahd, SCB_TASK_MANAGEMENT, 0);
2357                         ahd_search_qinfifo(ahd, SCB_GET_TARGET(ahd, scb),
2358                                            SCB_GET_CHANNEL(ahd, scb),
2359                                            SCB_GET_LUN(scb), SCB_GET_TAG(scb),
2360                                            ROLE_INITIATOR, /*status*/0,
2361                                            SEARCH_REMOVE);
2362                 }
2363                 break;
2364         }
2365         case TRACEPOINT0:
2366         case TRACEPOINT1:
2367         case TRACEPOINT2:
2368         case TRACEPOINT3:
2369                 printf("%s: Tracepoint %d\n", ahd_name(ahd),
2370                        seqintcode - TRACEPOINT0);
2371                 break;
2372         case NO_SEQINT:
2373                 break;
2374         case SAW_HWERR:
2375                 ahd_handle_hwerrint(ahd);
2376                 break;
2377         default:
2378                 printf("%s: Unexpected SEQINTCODE %d\n", ahd_name(ahd),
2379                        seqintcode);
2380                 break;
2381         }
2382         /*
2383          *  The sequencer is paused immediately on
2384          *  a SEQINT, so we should restart it when
2385          *  we're done.
2386          */
2387         ahd_unpause(ahd);
2388 }
2389
2390 static void
2391 ahd_handle_scsiint(struct ahd_softc *ahd, u_int intstat)
2392 {
2393         struct scb      *scb;
2394         u_int            status0;
2395         u_int            status3;
2396         u_int            status;
2397         u_int            lqistat1;
2398         u_int            lqostat0;
2399         u_int            scbid;
2400         u_int            busfreetime;
2401
2402         ahd_update_modes(ahd);
2403         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
2404
2405         status3 = ahd_inb(ahd, SSTAT3) & (NTRAMPERR|OSRAMPERR);
2406         status0 = ahd_inb(ahd, SSTAT0) & (IOERR|OVERRUN|SELDI|SELDO);
2407         status = ahd_inb(ahd, SSTAT1) & (SELTO|SCSIRSTI|BUSFREE|SCSIPERR);
2408         lqistat1 = ahd_inb(ahd, LQISTAT1);
2409         lqostat0 = ahd_inb(ahd, LQOSTAT0);
2410         busfreetime = ahd_inb(ahd, SSTAT2) & BUSFREETIME;
2411
2412         /*
2413          * Ignore external resets after a bus reset.
2414          */
2415         if (((status & SCSIRSTI) != 0) && (ahd->flags & AHD_BUS_RESET_ACTIVE)) {
2416                 ahd_outb(ahd, CLRSINT1, CLRSCSIRSTI);
2417                 return;
2418         }
2419
2420         /*
2421          * Clear bus reset flag
2422          */
2423         ahd->flags &= ~AHD_BUS_RESET_ACTIVE;
2424
2425         if ((status0 & (SELDI|SELDO)) != 0) {
2426                 u_int simode0;
2427
2428                 ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
2429                 simode0 = ahd_inb(ahd, SIMODE0);
2430                 status0 &= simode0 & (IOERR|OVERRUN|SELDI|SELDO);
2431                 ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
2432         }
2433         scbid = ahd_get_scbptr(ahd);
2434         scb = ahd_lookup_scb(ahd, scbid);
2435         if (scb != NULL
2436          && (ahd_inb(ahd, SEQ_FLAGS) & NOT_IDENTIFIED) != 0)
2437                 scb = NULL;
2438
2439         if ((status0 & IOERR) != 0) {
2440                 u_int now_lvd;
2441
2442                 now_lvd = ahd_inb(ahd, SBLKCTL) & ENAB40;
2443                 printf("%s: Transceiver State Has Changed to %s mode\n",
2444                        ahd_name(ahd), now_lvd ? "LVD" : "SE");
2445                 ahd_outb(ahd, CLRSINT0, CLRIOERR);
2446                 /*
2447                  * A change in I/O mode is equivalent to a bus reset.
2448                  */
2449                 ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
2450                 ahd_pause(ahd);
2451                 ahd_setup_iocell_workaround(ahd);
2452                 ahd_unpause(ahd);
2453         } else if ((status0 & OVERRUN) != 0) {
2454
2455                 printf("%s: SCSI offset overrun detected.  Resetting bus.\n",
2456                        ahd_name(ahd));
2457                 ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
2458         } else if ((status & SCSIRSTI) != 0) {
2459
2460                 printf("%s: Someone reset channel A\n", ahd_name(ahd));
2461                 ahd_reset_channel(ahd, 'A', /*Initiate Reset*/FALSE);
2462         } else if ((status & SCSIPERR) != 0) {
2463
2464                 /* Make sure the sequencer is in a safe location. */
2465                 ahd_clear_critical_section(ahd);
2466
2467                 ahd_handle_transmission_error(ahd);
2468         } else if (lqostat0 != 0) {
2469
2470                 printf("%s: lqostat0 == 0x%x!\n", ahd_name(ahd), lqostat0);
2471                 ahd_outb(ahd, CLRLQOINT0, lqostat0);
2472                 if ((ahd->bugs & AHD_CLRLQO_AUTOCLR_BUG) != 0)
2473                         ahd_outb(ahd, CLRLQOINT1, 0);
2474         } else if ((status & SELTO) != 0) {
2475                 /* Stop the selection */
2476                 ahd_outb(ahd, SCSISEQ0, 0);
2477
2478                 /* Make sure the sequencer is in a safe location. */
2479                 ahd_clear_critical_section(ahd);
2480
2481                 /* No more pending messages */
2482                 ahd_clear_msg_state(ahd);
2483
2484                 /* Clear interrupt state */
2485                 ahd_outb(ahd, CLRSINT1, CLRSELTIMEO|CLRBUSFREE|CLRSCSIPERR);
2486
2487                 /*
2488                  * Although the driver does not care about the
2489                  * 'Selection in Progress' status bit, the busy
2490                  * LED does.  SELINGO is only cleared by a sucessfull
2491                  * selection, so we must manually clear it to insure
2492                  * the LED turns off just incase no future successful
2493                  * selections occur (e.g. no devices on the bus).
2494                  */
2495                 ahd_outb(ahd, CLRSINT0, CLRSELINGO);
2496
2497                 scbid = ahd_inw(ahd, WAITING_TID_HEAD);
2498                 scb = ahd_lookup_scb(ahd, scbid);
2499                 if (scb == NULL) {
2500                         printf("%s: ahd_intr - referenced scb not "
2501                                "valid during SELTO scb(0x%x)\n",
2502                                ahd_name(ahd), scbid);
2503                         ahd_dump_card_state(ahd);
2504                 } else {
2505                         struct ahd_devinfo devinfo;
2506 #ifdef AHD_DEBUG
2507                         if ((ahd_debug & AHD_SHOW_SELTO) != 0) {
2508                                 ahd_print_path(ahd, scb);
2509                                 printf("Saw Selection Timeout for SCB 0x%x\n",
2510                                        scbid);
2511                         }
2512 #endif
2513                         ahd_scb_devinfo(ahd, &devinfo, scb);
2514                         ahd_set_transaction_status(scb, CAM_SEL_TIMEOUT);
2515                         ahd_freeze_devq(ahd, scb);
2516
2517                         /*
2518                          * Cancel any pending transactions on the device
2519                          * now that it seems to be missing.  This will
2520                          * also revert us to async/narrow transfers until
2521                          * we can renegotiate with the device.
2522                          */
2523                         ahd_handle_devreset(ahd, &devinfo,
2524                                             CAM_LUN_WILDCARD,
2525                                             CAM_SEL_TIMEOUT,
2526                                             "Selection Timeout",
2527                                             /*verbose_level*/1);
2528                 }
2529                 ahd_outb(ahd, CLRINT, CLRSCSIINT);
2530                 ahd_iocell_first_selection(ahd);
2531                 ahd_unpause(ahd);
2532         } else if ((status0 & (SELDI|SELDO)) != 0) {
2533
2534                 ahd_iocell_first_selection(ahd);
2535                 ahd_unpause(ahd);
2536         } else if (status3 != 0) {
2537                 printf("%s: SCSI Cell parity error SSTAT3 == 0x%x\n",
2538                        ahd_name(ahd), status3);
2539                 ahd_outb(ahd, CLRSINT3, status3);
2540         } else if ((lqistat1 & (LQIPHASE_LQ|LQIPHASE_NLQ)) != 0) {
2541
2542                 /* Make sure the sequencer is in a safe location. */
2543                 ahd_clear_critical_section(ahd);
2544
2545                 ahd_handle_lqiphase_error(ahd, lqistat1);
2546         } else if ((lqistat1 & LQICRCI_NLQ) != 0) {
2547                 /*
2548                  * This status can be delayed during some
2549                  * streaming operations.  The SCSIPHASE
2550                  * handler has already dealt with this case
2551                  * so just clear the error.
2552                  */
2553                 ahd_outb(ahd, CLRLQIINT1, CLRLQICRCI_NLQ);
2554         } else if ((status & BUSFREE) != 0
2555                 || (lqistat1 & LQOBUSFREE) != 0) {
2556                 u_int lqostat1;
2557                 int   restart;
2558                 int   clear_fifo;
2559                 int   packetized;
2560                 u_int mode;
2561
2562                 /*
2563                  * Clear our selection hardware as soon as possible.
2564                  * We may have an entry in the waiting Q for this target,
2565                  * that is affected by this busfree and we don't want to
2566                  * go about selecting the target while we handle the event.
2567                  */
2568                 ahd_outb(ahd, SCSISEQ0, 0);
2569
2570                 /* Make sure the sequencer is in a safe location. */
2571                 ahd_clear_critical_section(ahd);
2572
2573                 /*
2574                  * Determine what we were up to at the time of
2575                  * the busfree.
2576                  */
2577                 mode = AHD_MODE_SCSI;
2578                 busfreetime = ahd_inb(ahd, SSTAT2) & BUSFREETIME;
2579                 lqostat1 = ahd_inb(ahd, LQOSTAT1);
2580                 switch (busfreetime) {
2581                 case BUSFREE_DFF0:
2582                 case BUSFREE_DFF1:
2583                 {
2584                         mode = busfreetime == BUSFREE_DFF0
2585                              ? AHD_MODE_DFF0 : AHD_MODE_DFF1;
2586                         ahd_set_modes(ahd, mode, mode);
2587                         scbid = ahd_get_scbptr(ahd);
2588                         scb = ahd_lookup_scb(ahd, scbid);
2589                         if (scb == NULL) {
2590                                 printf("%s: Invalid SCB %d in DFF%d "
2591                                        "during unexpected busfree\n",
2592                                        ahd_name(ahd), scbid, mode);
2593                                 packetized = 0;
2594                         } else
2595                                 packetized = (scb->flags & SCB_PACKETIZED) != 0;
2596                         clear_fifo = 1;
2597                         break;
2598                 }
2599                 case BUSFREE_LQO:
2600                         clear_fifo = 0;
2601                         packetized = 1;
2602                         break;
2603                 default:
2604                         clear_fifo = 0;
2605                         packetized =  (lqostat1 & LQOBUSFREE) != 0;
2606                         if (!packetized
2607                          && ahd_inb(ahd, LASTPHASE) == P_BUSFREE
2608                          && (ahd_inb(ahd, SSTAT0) & SELDI) == 0
2609                          && ((ahd_inb(ahd, SSTAT0) & SELDO) == 0
2610                           || (ahd_inb(ahd, SCSISEQ0) & ENSELO) == 0))
2611                                 /*
2612                                  * Assume packetized if we are not
2613                                  * on the bus in a non-packetized
2614                                  * capacity and any pending selection
2615                                  * was a packetized selection.
2616                                  */
2617                                 packetized = 1;
2618                         break;
2619                 }
2620
2621 #ifdef AHD_DEBUG
2622                 if ((ahd_debug & AHD_SHOW_MISC) != 0)
2623                         printf("Saw Busfree.  Busfreetime = 0x%x.\n",
2624                                busfreetime);
2625 #endif
2626                 /*
2627                  * Busfrees that occur in non-packetized phases are
2628                  * handled by the nonpkt_busfree handler.
2629                  */
2630                 if (packetized && ahd_inb(ahd, LASTPHASE) == P_BUSFREE) {
2631                         restart = ahd_handle_pkt_busfree(ahd, busfreetime);
2632                 } else {
2633                         packetized = 0;
2634                         restart = ahd_handle_nonpkt_busfree(ahd);
2635                 }
2636                 /*
2637                  * Clear the busfree interrupt status.  The setting of
2638                  * the interrupt is a pulse, so in a perfect world, we
2639                  * would not need to muck with the ENBUSFREE logic.  This
2640                  * would ensure that if the bus moves on to another
2641                  * connection, busfree protection is still in force.  If
2642                  * BUSFREEREV is broken, however, we must manually clear
2643                  * the ENBUSFREE if the busfree occurred during a non-pack
2644                  * connection so that we don't get false positives during
2645                  * future, packetized, connections.
2646                  */
2647                 ahd_outb(ahd, CLRSINT1, CLRBUSFREE);
2648                 if (packetized == 0
2649                  && (ahd->bugs & AHD_BUSFREEREV_BUG) != 0)
2650                         ahd_outb(ahd, SIMODE1,
2651                                  ahd_inb(ahd, SIMODE1) & ~ENBUSFREE);
2652
2653                 if (clear_fifo)
2654                         ahd_clear_fifo(ahd, mode);
2655
2656                 ahd_clear_msg_state(ahd);
2657                 ahd_outb(ahd, CLRINT, CLRSCSIINT);
2658                 if (restart) {
2659                         ahd_restart(ahd);
2660                 } else {
2661                         ahd_unpause(ahd);
2662                 }
2663         } else {
2664                 printf("%s: Missing case in ahd_handle_scsiint. status = %x\n",
2665                        ahd_name(ahd), status);
2666                 ahd_dump_card_state(ahd);
2667                 ahd_clear_intstat(ahd);
2668                 ahd_unpause(ahd);
2669         }
2670 }
2671
2672 static void
2673 ahd_handle_transmission_error(struct ahd_softc *ahd)
2674 {
2675         struct  scb *scb;
2676         u_int   scbid;
2677         u_int   lqistat1;
2678         u_int   lqistat2;
2679         u_int   msg_out;
2680         u_int   curphase;
2681         u_int   lastphase;
2682         u_int   perrdiag;
2683         u_int   cur_col;
2684         int     silent;
2685
2686         scb = NULL;
2687         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
2688         lqistat1 = ahd_inb(ahd, LQISTAT1) & ~(LQIPHASE_LQ|LQIPHASE_NLQ);
2689         lqistat2 = ahd_inb(ahd, LQISTAT2);
2690         if ((lqistat1 & (LQICRCI_NLQ|LQICRCI_LQ)) == 0
2691          && (ahd->bugs & AHD_NLQICRC_DELAYED_BUG) != 0) {
2692                 u_int lqistate;
2693
2694                 ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
2695                 lqistate = ahd_inb(ahd, LQISTATE);
2696                 if ((lqistate >= 0x1E && lqistate <= 0x24)
2697                  || (lqistate == 0x29)) {
2698 #ifdef AHD_DEBUG
2699                         if ((ahd_debug & AHD_SHOW_RECOVERY) != 0) {
2700                                 printf("%s: NLQCRC found via LQISTATE\n",
2701                                        ahd_name(ahd));
2702                         }
2703 #endif
2704                         lqistat1 |= LQICRCI_NLQ;
2705                 }
2706                 ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
2707         }
2708
2709         ahd_outb(ahd, CLRLQIINT1, lqistat1);
2710         lastphase = ahd_inb(ahd, LASTPHASE);
2711         curphase = ahd_inb(ahd, SCSISIGI) & PHASE_MASK;
2712         perrdiag = ahd_inb(ahd, PERRDIAG);
2713         msg_out = MSG_INITIATOR_DET_ERR;
2714         ahd_outb(ahd, CLRSINT1, CLRSCSIPERR);
2715
2716         /*
2717          * Try to find the SCB associated with this error.
2718          */
2719         silent = FALSE;
2720         if (lqistat1 == 0
2721          || (lqistat1 & LQICRCI_NLQ) != 0) {
2722                 if ((lqistat1 & (LQICRCI_NLQ|LQIOVERI_NLQ)) != 0)
2723                         ahd_set_active_fifo(ahd);
2724                 scbid = ahd_get_scbptr(ahd);
2725                 scb = ahd_lookup_scb(ahd, scbid);
2726                 if (scb != NULL && SCB_IS_SILENT(scb))
2727                         silent = TRUE;
2728         }
2729
2730         cur_col = 0;
2731         if (silent == FALSE) {
2732                 printf("%s: Transmission error detected\n", ahd_name(ahd));
2733                 ahd_lqistat1_print(lqistat1, &cur_col, 50);
2734                 ahd_lastphase_print(lastphase, &cur_col, 50);
2735                 ahd_scsisigi_print(curphase, &cur_col, 50);
2736                 ahd_perrdiag_print(perrdiag, &cur_col, 50);
2737                 printf("\n");
2738                 ahd_dump_card_state(ahd);
2739         }
2740
2741         if ((lqistat1 & (LQIOVERI_LQ|LQIOVERI_NLQ)) != 0) {
2742                 if (silent == FALSE) {
2743                         printf("%s: Gross protocol error during incoming "
2744                                "packet.  lqistat1 == 0x%x.  Resetting bus.\n",
2745                                ahd_name(ahd), lqistat1);
2746                 }
2747                 ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
2748                 return;
2749         } else if ((lqistat1 & LQICRCI_LQ) != 0) {
2750                 /*
2751                  * A CRC error has been detected on an incoming LQ.
2752                  * The bus is currently hung on the last ACK.
2753                  * Hit LQIRETRY to release the last ack, and
2754                  * wait for the sequencer to determine that ATNO
2755                  * is asserted while in message out to take us
2756                  * to our host message loop.  No NONPACKREQ or
2757                  * LQIPHASE type errors will occur in this
2758                  * scenario.  After this first LQIRETRY, the LQI
2759                  * manager will be in ISELO where it will
2760                  * happily sit until another packet phase begins.
2761                  * Unexpected bus free detection is enabled
2762                  * through any phases that occur after we release
2763                  * this last ack until the LQI manager sees a
2764                  * packet phase.  This implies we may have to
2765                  * ignore a perfectly valid "unexected busfree"
2766                  * after our "initiator detected error" message is
2767                  * sent.  A busfree is the expected response after
2768                  * we tell the target that it's L_Q was corrupted.
2769                  * (SPI4R09 10.7.3.3.3)
2770                  */
2771                 ahd_outb(ahd, LQCTL2, LQIRETRY);
2772                 printf("LQIRetry for LQICRCI_LQ to release ACK\n");
2773         } else if ((lqistat1 & LQICRCI_NLQ) != 0) {
2774                 /*
2775                  * We detected a CRC error in a NON-LQ packet.
2776                  * The hardware has varying behavior in this situation
2777                  * depending on whether this packet was part of a
2778                  * stream or not.
2779                  *
2780                  * PKT by PKT mode:
2781                  * The hardware has already acked the complete packet.
2782                  * If the target honors our outstanding ATN condition,
2783                  * we should be (or soon will be) in MSGOUT phase.
2784                  * This will trigger the LQIPHASE_LQ status bit as the
2785                  * hardware was expecting another LQ.  Unexpected
2786                  * busfree detection is enabled.  Once LQIPHASE_LQ is
2787                  * true (first entry into host message loop is much
2788                  * the same), we must clear LQIPHASE_LQ and hit
2789                  * LQIRETRY so the hardware is ready to handle
2790                  * a future LQ.  NONPACKREQ will not be asserted again
2791                  * once we hit LQIRETRY until another packet is
2792                  * processed.  The target may either go busfree
2793                  * or start another packet in response to our message.
2794                  *
2795                  * Read Streaming P0 asserted:
2796                  * If we raise ATN and the target completes the entire
2797                  * stream (P0 asserted during the last packet), the
2798                  * hardware will ack all data and return to the ISTART
2799                  * state.  When the target reponds to our ATN condition,
2800                  * LQIPHASE_LQ will be asserted.  We should respond to
2801                  * this with an LQIRETRY to prepare for any future
2802                  * packets.  NONPACKREQ will not be asserted again
2803                  * once we hit LQIRETRY until another packet is
2804                  * processed.  The target may either go busfree or
2805                  * start another packet in response to our message.
2806                  * Busfree detection is enabled.
2807                  *
2808                  * Read Streaming P0 not asserted:
2809                  * If we raise ATN and the target transitions to
2810                  * MSGOUT in or after a packet where P0 is not
2811                  * asserted, the hardware will assert LQIPHASE_NLQ.
2812                  * We should respond to the LQIPHASE_NLQ with an
2813                  * LQIRETRY.  Should the target stay in a non-pkt
2814                  * phase after we send our message, the hardware
2815                  * will assert LQIPHASE_LQ.  Recovery is then just as
2816                  * listed above for the read streaming with P0 asserted.
2817                  * Busfree detection is enabled.
2818                  */
2819                 if (silent == FALSE)
2820                         printf("LQICRC_NLQ\n");
2821                 if (scb == NULL) {
2822                         printf("%s: No SCB valid for LQICRC_NLQ.  "
2823                                "Resetting bus\n", ahd_name(ahd));
2824                         ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
2825                         return;
2826                 }
2827         } else if ((lqistat1 & LQIBADLQI) != 0) {
2828                 printf("Need to handle BADLQI!\n");
2829                 ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
2830                 return;
2831         } else if ((perrdiag & (PARITYERR|PREVPHASE)) == PARITYERR) {
2832                 if ((curphase & ~P_DATAIN_DT) != 0) {
2833                         /* Ack the byte.  So we can continue. */
2834                         if (silent == FALSE)
2835                                 printf("Acking %s to clear perror\n",
2836                                     ahd_lookup_phase_entry(curphase)->phasemsg);
2837                         ahd_inb(ahd, SCSIDAT);
2838                 }
2839
2840                 if (curphase == P_MESGIN)
2841                         msg_out = MSG_PARITY_ERROR;
2842         }
2843
2844         /*
2845          * We've set the hardware to assert ATN if we
2846          * get a parity error on "in" phases, so all we
2847          * need to do is stuff the message buffer with
2848          * the appropriate message.  "In" phases have set
2849          * mesg_out to something other than MSG_NOP.
2850          */
2851         ahd->send_msg_perror = msg_out;
2852         if (scb != NULL && msg_out == MSG_INITIATOR_DET_ERR)
2853                 scb->flags |= SCB_TRANSMISSION_ERROR;
2854         ahd_outb(ahd, MSG_OUT, HOST_MSG);
2855         ahd_outb(ahd, CLRINT, CLRSCSIINT);
2856         ahd_unpause(ahd);
2857 }
2858
2859 static void
2860 ahd_handle_lqiphase_error(struct ahd_softc *ahd, u_int lqistat1)
2861 {
2862         /*
2863          * Clear the sources of the interrupts.
2864          */
2865         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
2866         ahd_outb(ahd, CLRLQIINT1, lqistat1);
2867
2868         /*
2869          * If the "illegal" phase changes were in response
2870          * to our ATN to flag a CRC error, AND we ended up
2871          * on packet boundaries, clear the error, restart the
2872          * LQI manager as appropriate, and go on our merry
2873          * way toward sending the message.  Otherwise, reset
2874          * the bus to clear the error.
2875          */
2876         ahd_set_active_fifo(ahd);
2877         if ((ahd_inb(ahd, SCSISIGO) & ATNO) != 0
2878          && (ahd_inb(ahd, MDFFSTAT) & DLZERO) != 0) {
2879                 if ((lqistat1 & LQIPHASE_LQ) != 0) {
2880                         printf("LQIRETRY for LQIPHASE_LQ\n");
2881                         ahd_outb(ahd, LQCTL2, LQIRETRY);
2882                 } else if ((lqistat1 & LQIPHASE_NLQ) != 0) {
2883                         printf("LQIRETRY for LQIPHASE_NLQ\n");
2884                         ahd_outb(ahd, LQCTL2, LQIRETRY);
2885                 } else
2886                         panic("ahd_handle_lqiphase_error: No phase errors\n");
2887                 ahd_dump_card_state(ahd);
2888                 ahd_outb(ahd, CLRINT, CLRSCSIINT);
2889                 ahd_unpause(ahd);
2890         } else {
2891                 printf("Reseting Channel for LQI Phase error\n");
2892                 ahd_dump_card_state(ahd);
2893                 ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
2894         }
2895 }
2896
2897 /*
2898  * Packetized unexpected or expected busfree.
2899  * Entered in mode based on busfreetime.
2900  */
2901 static int
2902 ahd_handle_pkt_busfree(struct ahd_softc *ahd, u_int busfreetime)
2903 {
2904         u_int lqostat1;
2905
2906         AHD_ASSERT_MODES(ahd, ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK),
2907                          ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK));
2908         lqostat1 = ahd_inb(ahd, LQOSTAT1);
2909         if ((lqostat1 & LQOBUSFREE) != 0) {
2910                 struct scb *scb;
2911                 u_int scbid;
2912                 u_int saved_scbptr;
2913                 u_int waiting_h;
2914                 u_int waiting_t;
2915                 u_int next;
2916
2917                 /*
2918                  * The LQO manager detected an unexpected busfree
2919                  * either:
2920                  *
2921                  * 1) During an outgoing LQ.
2922                  * 2) After an outgoing LQ but before the first
2923                  *    REQ of the command packet.
2924                  * 3) During an outgoing command packet.
2925                  *
2926                  * In all cases, CURRSCB is pointing to the
2927                  * SCB that encountered the failure.  Clean
2928                  * up the queue, clear SELDO and LQOBUSFREE,
2929                  * and allow the sequencer to restart the select
2930                  * out at its lesure.
2931                  */
2932                 ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
2933                 scbid = ahd_inw(ahd, CURRSCB);
2934                 scb = ahd_lookup_scb(ahd, scbid);
2935                 if (scb == NULL)
2936                        panic("SCB not valid during LQOBUSFREE");
2937                 /*
2938                  * Clear the status.
2939                  */
2940                 ahd_outb(ahd, CLRLQOINT1, CLRLQOBUSFREE);
2941                 if ((ahd->bugs & AHD_CLRLQO_AUTOCLR_BUG) != 0)
2942                         ahd_outb(ahd, CLRLQOINT1, 0);
2943                 ahd_outb(ahd, SCSISEQ0, ahd_inb(ahd, SCSISEQ0) & ~ENSELO);
2944                 ahd_flush_device_writes(ahd);
2945                 ahd_outb(ahd, CLRSINT0, CLRSELDO);
2946
2947                 /*
2948                  * Return the LQO manager to its idle loop.  It will
2949                  * not do this automatically if the busfree occurs
2950                  * after the first REQ of either the LQ or command
2951                  * packet or between the LQ and command packet.
2952                  */
2953                 ahd_outb(ahd, LQCTL2, ahd_inb(ahd, LQCTL2) | LQOTOIDLE);
2954
2955                 /*
2956                  * Update the waiting for selection queue so
2957                  * we restart on the correct SCB.
2958                  */
2959                 waiting_h = ahd_inw(ahd, WAITING_TID_HEAD);
2960                 saved_scbptr = ahd_get_scbptr(ahd);
2961                 if (waiting_h != scbid) {
2962
2963                         ahd_outw(ahd, WAITING_TID_HEAD, scbid);
2964                         waiting_t = ahd_inw(ahd, WAITING_TID_TAIL);
2965                         if (waiting_t == waiting_h) {
2966                                 ahd_outw(ahd, WAITING_TID_TAIL, scbid);
2967                                 next = SCB_LIST_NULL;
2968                         } else {
2969                                 ahd_set_scbptr(ahd, waiting_h);
2970                                 next = ahd_inw_scbram(ahd, SCB_NEXT2);
2971                         }
2972                         ahd_set_scbptr(ahd, scbid);
2973                         ahd_outw(ahd, SCB_NEXT2, next);
2974                 }
2975                 ahd_set_scbptr(ahd, saved_scbptr);
2976                 if (scb->crc_retry_count < AHD_MAX_LQ_CRC_ERRORS) {
2977                         if (SCB_IS_SILENT(scb) == FALSE) {
2978                                 ahd_print_path(ahd, scb);
2979                                 printf("Probable outgoing LQ CRC error.  "
2980                                        "Retrying command\n");
2981                         }
2982                         scb->crc_retry_count++;
2983                 } else {
2984                         ahd_set_transaction_status(scb, CAM_UNCOR_PARITY);
2985                         ahd_freeze_scb(scb);
2986                         ahd_freeze_devq(ahd, scb);
2987                 }
2988                 /* Return unpausing the sequencer. */
2989                 return (0);
2990         } else if ((ahd_inb(ahd, PERRDIAG) & PARITYERR) != 0) {
2991                 /*
2992                  * Ignore what are really parity errors that
2993                  * occur on the last REQ of a free running
2994                  * clock prior to going busfree.  Some drives
2995                  * do not properly active negate just before
2996                  * going busfree resulting in a parity glitch.
2997                  */
2998                 ahd_outb(ahd, CLRSINT1, CLRSCSIPERR|CLRBUSFREE);
2999 #ifdef AHD_DEBUG
3000                 if ((ahd_debug & AHD_SHOW_MASKED_ERRORS) != 0)
3001                         printf("%s: Parity on last REQ detected "
3002                                "during busfree phase.\n",
3003                                ahd_name(ahd));
3004 #endif
3005                 /* Return unpausing the sequencer. */
3006                 return (0);
3007         }
3008         if (ahd->src_mode != AHD_MODE_SCSI) {
3009                 u_int   scbid;
3010                 struct  scb *scb;
3011
3012                 scbid = ahd_get_scbptr(ahd);
3013                 scb = ahd_lookup_scb(ahd, scbid);
3014                 ahd_print_path(ahd, scb);
3015                 printf("Unexpected PKT busfree condition\n");
3016                 ahd_dump_card_state(ahd);
3017                 ahd_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb), 'A',
3018                                SCB_GET_LUN(scb), SCB_GET_TAG(scb),
3019                                ROLE_INITIATOR, CAM_UNEXP_BUSFREE);
3020
3021                 /* Return restarting the sequencer. */
3022                 return (1);
3023         }
3024         printf("%s: Unexpected PKT busfree condition\n", ahd_name(ahd));
3025         ahd_dump_card_state(ahd);
3026         /* Restart the sequencer. */
3027         return (1);
3028 }
3029
3030 /*
3031  * Non-packetized unexpected or expected busfree.
3032  */
3033 static int
3034 ahd_handle_nonpkt_busfree(struct ahd_softc *ahd)
3035 {
3036         struct  ahd_devinfo devinfo;
3037         struct  scb *scb;
3038         u_int   lastphase;
3039         u_int   saved_scsiid;
3040         u_int   saved_lun;
3041         u_int   target;
3042         u_int   initiator_role_id;
3043         u_int   scbid;
3044         u_int   ppr_busfree;
3045         int     printerror;
3046
3047         /*
3048          * Look at what phase we were last in.  If its message out,
3049          * chances are pretty good that the busfree was in response
3050          * to one of our abort requests.
3051          */
3052         lastphase = ahd_inb(ahd, LASTPHASE);
3053         saved_scsiid = ahd_inb(ahd, SAVED_SCSIID);
3054         saved_lun = ahd_inb(ahd, SAVED_LUN);
3055         target = SCSIID_TARGET(ahd, saved_scsiid);
3056         initiator_role_id = SCSIID_OUR_ID(saved_scsiid);
3057         ahd_compile_devinfo(&devinfo, initiator_role_id,
3058                             target, saved_lun, 'A', ROLE_INITIATOR);
3059         printerror = 1;
3060
3061         scbid = ahd_get_scbptr(ahd);
3062         scb = ahd_lookup_scb(ahd, scbid);
3063         if (scb != NULL
3064          && (ahd_inb(ahd, SEQ_FLAGS) & NOT_IDENTIFIED) != 0)
3065                 scb = NULL;
3066
3067         ppr_busfree = (ahd->msg_flags & MSG_FLAG_EXPECT_PPR_BUSFREE) != 0;
3068         if (lastphase == P_MESGOUT) {
3069                 u_int tag;
3070
3071                 tag = SCB_LIST_NULL;
3072                 if (ahd_sent_msg(ahd, AHDMSG_1B, MSG_ABORT_TAG, TRUE)
3073                  || ahd_sent_msg(ahd, AHDMSG_1B, MSG_ABORT, TRUE)) {
3074                         int found;
3075                         int sent_msg;
3076
3077                         if (scb == NULL) {
3078                                 ahd_print_devinfo(ahd, &devinfo);
3079                                 printf("Abort for unidentified "
3080                                        "connection completed.\n");
3081                                 /* restart the sequencer. */
3082                                 return (1);
3083                         }
3084                         sent_msg = ahd->msgout_buf[ahd->msgout_index - 1];
3085                         ahd_print_path(ahd, scb);
3086                         printf("SCB %d - Abort%s Completed.\n",
3087                                SCB_GET_TAG(scb),
3088                                sent_msg == MSG_ABORT_TAG ? "" : " Tag");
3089
3090                         if (sent_msg == MSG_ABORT_TAG)
3091                                 tag = SCB_GET_TAG(scb);
3092
3093                         if ((scb->flags & SCB_EXTERNAL_RESET) != 0) {
3094                                 /*
3095                                  * This abort is in response to an
3096                                  * unexpected switch to command phase
3097                                  * for a packetized connection.  Since
3098                                  * the identify message was never sent,
3099                                  * "saved lun" is 0.  We really want to
3100                                  * abort only the SCB that encountered
3101                                  * this error, which could have a different
3102                                  * lun.  The SCB will be retried so the OS
3103                                  * will see the UA after renegotiating to
3104                                  * packetized.
3105                                  */
3106                                 tag = SCB_GET_TAG(scb);
3107                                 saved_lun = scb->hscb->lun;
3108                         }
3109                         found = ahd_abort_scbs(ahd, target, 'A', saved_lun,
3110                                                tag, ROLE_INITIATOR,
3111                                                CAM_REQ_ABORTED);
3112                         printf("found == 0x%x\n", found);
3113                         printerror = 0;
3114                 } else if (ahd_sent_msg(ahd, AHDMSG_1B,
3115                                         MSG_BUS_DEV_RESET, TRUE)) {
3116 #ifdef __FreeBSD__
3117                         /*
3118                          * Don't mark the user's request for this BDR
3119                          * as completing with CAM_BDR_SENT.  CAM3
3120                          * specifies CAM_REQ_CMP.
3121                          */
3122                         if (scb != NULL
3123                          && scb->io_ctx->ccb_h.func_code== XPT_RESET_DEV
3124                          && ahd_match_scb(ahd, scb, target, 'A',
3125                                           CAM_LUN_WILDCARD, SCB_LIST_NULL,
3126                                           ROLE_INITIATOR))
3127                                 ahd_set_transaction_status(scb, CAM_REQ_CMP);
3128 #endif
3129                         ahd_handle_devreset(ahd, &devinfo, CAM_LUN_WILDCARD,
3130                                             CAM_BDR_SENT, "Bus Device Reset",
3131                                             /*verbose_level*/0);
3132                         printerror = 0;
3133                 } else if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_PPR, FALSE)
3134                         && ppr_busfree == 0) {
3135                         struct ahd_initiator_tinfo *tinfo;
3136                         struct ahd_tmode_tstate *tstate;
3137
3138                         /*
3139                          * PPR Rejected.
3140                          *
3141                          * If the previous negotiation was packetized,
3142                          * this could be because the device has been
3143                          * reset without our knowledge.  Force our
3144                          * current negotiation to async and retry the
3145                          * negotiation.  Otherwise retry the command
3146                          * with non-ppr negotiation.
3147                          */
3148 #ifdef AHD_DEBUG
3149                         if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
3150                                 printf("PPR negotiation rejected busfree.\n");
3151 #endif
3152                         tinfo = ahd_fetch_transinfo(ahd, devinfo.channel,
3153                                                     devinfo.our_scsiid,
3154                                                     devinfo.target, &tstate);
3155                         if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ)!=0) {
3156                                 ahd_set_width(ahd, &devinfo,
3157                                               MSG_EXT_WDTR_BUS_8_BIT,
3158                                               AHD_TRANS_CUR,
3159                                               /*paused*/TRUE);
3160                                 ahd_set_syncrate(ahd, &devinfo,
3161                                                 /*period*/0, /*offset*/0,
3162                                                 /*ppr_options*/0,
3163                                                 AHD_TRANS_CUR,
3164                                                 /*paused*/TRUE);
3165                                 /*
3166                                  * The expect PPR busfree handler below
3167                                  * will effect the retry and necessary
3168                                  * abort.
3169                                  */
3170                         } else {
3171                                 tinfo->curr.transport_version = 2;
3172                                 tinfo->goal.transport_version = 2;
3173                                 tinfo->goal.ppr_options = 0;
3174                                 /*
3175                                  * Remove any SCBs in the waiting for selection
3176                                  * queue that may also be for this target so
3177                                  * that command ordering is preserved.
3178                                  */
3179                                 ahd_freeze_devq(ahd, scb);
3180                                 ahd_qinfifo_requeue_tail(ahd, scb);
3181                                 printerror = 0;
3182                         }
3183                 } else if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_WDTR, FALSE)
3184                         && ppr_busfree == 0) {
3185                         /*
3186                          * Negotiation Rejected.  Go-narrow and
3187                          * retry command.
3188                          */
3189 #ifdef AHD_DEBUG
3190                         if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
3191                                 printf("WDTR negotiation rejected busfree.\n");
3192 #endif
3193                         ahd_set_width(ahd, &devinfo,
3194                                       MSG_EXT_WDTR_BUS_8_BIT,
3195                                       AHD_TRANS_CUR|AHD_TRANS_GOAL,
3196                                       /*paused*/TRUE);
3197                         /*
3198                          * Remove any SCBs in the waiting for selection
3199                          * queue that may also be for this target so that
3200                          * command ordering is preserved.
3201                          */
3202                         ahd_freeze_devq(ahd, scb);
3203                         ahd_qinfifo_requeue_tail(ahd, scb);
3204                         printerror = 0;
3205                 } else if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_SDTR, FALSE)
3206                         && ppr_busfree == 0) {
3207                         /*
3208                          * Negotiation Rejected.  Go-async and
3209                          * retry command.
3210                          */
3211 #ifdef AHD_DEBUG
3212                         if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
3213                                 printf("SDTR negotiation rejected busfree.\n");
3214 #endif
3215                         ahd_set_syncrate(ahd, &devinfo,
3216                                         /*period*/0, /*offset*/0,
3217                                         /*ppr_options*/0,
3218                                         AHD_TRANS_CUR|AHD_TRANS_GOAL,
3219                                         /*paused*/TRUE);
3220                         /*
3221                          * Remove any SCBs in the waiting for selection
3222                          * queue that may also be for this target so that
3223                          * command ordering is preserved.
3224                          */
3225                         ahd_freeze_devq(ahd, scb);
3226                         ahd_qinfifo_requeue_tail(ahd, scb);
3227                         printerror = 0;
3228                 } else if ((ahd->msg_flags & MSG_FLAG_EXPECT_IDE_BUSFREE) != 0
3229                         && ahd_sent_msg(ahd, AHDMSG_1B,
3230                                          MSG_INITIATOR_DET_ERR, TRUE)) {
3231
3232 #ifdef AHD_DEBUG
3233                         if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
3234                                 printf("Expected IDE Busfree\n");
3235 #endif
3236                         printerror = 0;
3237                 } else if ((ahd->msg_flags & MSG_FLAG_EXPECT_QASREJ_BUSFREE)
3238                         && ahd_sent_msg(ahd, AHDMSG_1B,
3239                                         MSG_MESSAGE_REJECT, TRUE)) {
3240
3241 #ifdef AHD_DEBUG
3242                         if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
3243                                 printf("Expected QAS Reject Busfree\n");
3244 #endif
3245                         printerror = 0;
3246                 }
3247         }
3248
3249         /*
3250          * The busfree required flag is honored at the end of
3251          * the message phases.  We check it last in case we
3252          * had to send some other message that caused a busfree.
3253          */
3254         if (printerror != 0
3255          && (lastphase == P_MESGIN || lastphase == P_MESGOUT)
3256          && ((ahd->msg_flags & MSG_FLAG_EXPECT_PPR_BUSFREE) != 0)) {
3257
3258                 ahd_freeze_devq(ahd, scb);
3259                 ahd_set_transaction_status(scb, CAM_REQUEUE_REQ);
3260                 ahd_freeze_scb(scb);
3261                 if ((ahd->msg_flags & MSG_FLAG_IU_REQ_CHANGED) != 0) {
3262                         ahd_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb),
3263                                        SCB_GET_CHANNEL(ahd, scb),
3264                                        SCB_GET_LUN(scb), SCB_LIST_NULL,
3265                                        ROLE_INITIATOR, CAM_REQ_ABORTED);
3266                 } else {
3267 #ifdef AHD_DEBUG
3268                         if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
3269                                 printf("PPR Negotiation Busfree.\n");
3270 #endif
3271                         ahd_done(ahd, scb);
3272                 }
3273                 printerror = 0;
3274         }
3275         if (printerror != 0) {
3276                 int aborted;
3277
3278                 aborted = 0;
3279                 if (scb != NULL) {
3280                         u_int tag;
3281
3282                         if ((scb->hscb->control & TAG_ENB) != 0)
3283                                 tag = SCB_GET_TAG(scb);
3284                         else
3285                                 tag = SCB_LIST_NULL;
3286                         ahd_print_path(ahd, scb);
3287                         aborted = ahd_abort_scbs(ahd, target, 'A',
3288                                        SCB_GET_LUN(scb), tag,
3289                                        ROLE_INITIATOR,
3290                                        CAM_UNEXP_BUSFREE);
3291                 } else {
3292                         /*
3293                          * We had not fully identified this connection,
3294                          * so we cannot abort anything.
3295                          */
3296                         printf("%s: ", ahd_name(ahd));
3297                 }
3298                 printf("Unexpected busfree %s, %d SCBs aborted, "
3299                        "PRGMCNT == 0x%x\n",
3300                        ahd_lookup_phase_entry(lastphase)->phasemsg,
3301                        aborted,
3302                        ahd_inw(ahd, PRGMCNT));
3303                 ahd_dump_card_state(ahd);
3304                 if (lastphase != P_BUSFREE)
3305                         ahd_force_renegotiation(ahd, &devinfo);
3306         }
3307         /* Always restart the sequencer. */
3308         return (1);
3309 }
3310
3311 static void
3312 ahd_handle_proto_violation(struct ahd_softc *ahd)
3313 {
3314         struct  ahd_devinfo devinfo;
3315         struct  scb *scb;
3316         u_int   scbid;
3317         u_int   seq_flags;
3318         u_int   curphase;
3319         u_int   lastphase;
3320         int     found;
3321
3322         ahd_fetch_devinfo(ahd, &devinfo);
3323         scbid = ahd_get_scbptr(ahd);
3324         scb = ahd_lookup_scb(ahd, scbid);
3325         seq_flags = ahd_inb(ahd, SEQ_FLAGS);
3326         curphase = ahd_inb(ahd, SCSISIGI) & PHASE_MASK;
3327         lastphase = ahd_inb(ahd, LASTPHASE);
3328         if ((seq_flags & NOT_IDENTIFIED) != 0) {
3329
3330                 /*
3331                  * The reconnecting target either did not send an
3332                  * identify message, or did, but we didn't find an SCB
3333                  * to match.
3334                  */
3335                 ahd_print_devinfo(ahd, &devinfo);
3336                 printf("Target did not send an IDENTIFY message. "
3337                        "LASTPHASE = 0x%x.\n", lastphase);
3338                 scb = NULL;
3339         } else if (scb == NULL) {
3340                 /*
3341                  * We don't seem to have an SCB active for this
3342                  * transaction.  Print an error and reset the bus.
3343                  */
3344                 ahd_print_devinfo(ahd, &devinfo);
3345                 printf("No SCB found during protocol violation\n");
3346                 goto proto_violation_reset;
3347         } else {
3348                 ahd_set_transaction_status(scb, CAM_SEQUENCE_FAIL);
3349                 if ((seq_flags & NO_CDB_SENT) != 0) {
3350                         ahd_print_path(ahd, scb);
3351                         printf("No or incomplete CDB sent to device.\n");
3352                 } else if ((ahd_inb_scbram(ahd, SCB_CONTROL)
3353                           & STATUS_RCVD) == 0) {
3354                         /*
3355                          * The target never bothered to provide status to
3356                          * us prior to completing the command.  Since we don't
3357                          * know the disposition of this command, we must attempt
3358                          * to abort it.  Assert ATN and prepare to send an abort
3359                          * message.
3360                          */
3361                         ahd_print_path(ahd, scb);
3362                         printf("Completed command without status.\n");
3363                 } else {
3364                         ahd_print_path(ahd, scb);
3365                         printf("Unknown protocol violation.\n");
3366                         ahd_dump_card_state(ahd);
3367                 }
3368         }
3369         if ((lastphase & ~P_DATAIN_DT) == 0
3370          || lastphase == P_COMMAND) {
3371 proto_violation_reset:
3372                 /*
3373                  * Target either went directly to data
3374                  * phase or didn't respond to our ATN.
3375                  * The only safe thing to do is to blow
3376                  * it away with a bus reset.
3377                  */
3378                 found = ahd_reset_channel(ahd, 'A', TRUE);
3379                 printf("%s: Issued Channel %c Bus Reset. "
3380                        "%d SCBs aborted\n", ahd_name(ahd), 'A', found);
3381         } else {
3382                 /*
3383                  * Leave the selection hardware off in case
3384                  * this abort attempt will affect yet to
3385                  * be sent commands.
3386                  */
3387                 ahd_outb(ahd, SCSISEQ0,
3388                          ahd_inb(ahd, SCSISEQ0) & ~ENSELO);
3389                 ahd_assert_atn(ahd);
3390                 ahd_outb(ahd, MSG_OUT, HOST_MSG);
3391                 if (scb == NULL) {
3392                         ahd_print_devinfo(ahd, &devinfo);
3393                         ahd->msgout_buf[0] = MSG_ABORT_TASK;
3394                         ahd->msgout_len = 1;
3395                         ahd->msgout_index = 0;
3396                         ahd->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
3397                 } else {
3398                         ahd_print_path(ahd, scb);
3399                         scb->flags |= SCB_ABORT;
3400                 }
3401                 printf("Protocol violation %s.  Attempting to abort.\n",
3402                        ahd_lookup_phase_entry(curphase)->phasemsg);
3403         }
3404 }
3405
3406 /*
3407  * Force renegotiation to occur the next time we initiate
3408  * a command to the current device.
3409  */
3410 static void
3411 ahd_force_renegotiation(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
3412 {
3413         struct  ahd_initiator_tinfo *targ_info;
3414         struct  ahd_tmode_tstate *tstate;
3415
3416 #ifdef AHD_DEBUG
3417         if ((ahd_debug & AHD_SHOW_MESSAGES) != 0) {
3418                 ahd_print_devinfo(ahd, devinfo);
3419                 printf("Forcing renegotiation\n");
3420         }
3421 #endif
3422         targ_info = ahd_fetch_transinfo(ahd,
3423                                         devinfo->channel,
3424                                         devinfo->our_scsiid,
3425                                         devinfo->target,
3426                                         &tstate);
3427         ahd_update_neg_request(ahd, devinfo, tstate,
3428                                targ_info, AHD_NEG_IF_NON_ASYNC);
3429 }
3430
3431 #define AHD_MAX_STEPS 2000
3432 static void
3433 ahd_clear_critical_section(struct ahd_softc *ahd)
3434 {
3435         ahd_mode_state  saved_modes;
3436         int             stepping;
3437         int             steps;
3438         int             first_instr;
3439         u_int           simode0;
3440         u_int           simode1;
3441         u_int           simode3;
3442         u_int           lqimode0;
3443         u_int           lqimode1;
3444         u_int           lqomode0;
3445         u_int           lqomode1;
3446
3447         if (ahd->num_critical_sections == 0)
3448                 return;
3449
3450         stepping = FALSE;
3451         steps = 0;
3452         first_instr = 0;
3453         simode0 = 0;
3454         simode1 = 0;
3455         simode3 = 0;
3456         lqimode0 = 0;
3457         lqimode1 = 0;
3458         lqomode0 = 0;
3459         lqomode1 = 0;
3460         saved_modes = ahd_save_modes(ahd);
3461         for (;;) {
3462                 struct  cs *cs;
3463                 u_int   seqaddr;
3464                 u_int   i;
3465
3466                 ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
3467                 seqaddr = ahd_inw(ahd, CURADDR);
3468
3469                 cs = ahd->critical_sections;
3470                 for (i = 0; i < ahd->num_critical_sections; i++, cs++) {
3471
3472                         if (cs->begin < seqaddr && cs->end >= seqaddr)
3473                                 break;
3474                 }
3475
3476                 if (i == ahd->num_critical_sections)
3477                         break;
3478
3479                 if (steps > AHD_MAX_STEPS) {
3480                         printf("%s: Infinite loop in critical section\n"
3481                                "%s: First Instruction 0x%x now 0x%x\n",
3482                                ahd_name(ahd), ahd_name(ahd), first_instr,
3483                                seqaddr);
3484                         ahd_dump_card_state(ahd);
3485                         panic("critical section loop");
3486                 }
3487
3488                 steps++;
3489 #ifdef AHD_DEBUG
3490                 if ((ahd_debug & AHD_SHOW_MISC) != 0)
3491                         printf("%s: Single stepping at 0x%x\n", ahd_name(ahd),
3492                                seqaddr);
3493 #endif
3494                 if (stepping == FALSE) {
3495
3496                         first_instr = seqaddr;
3497                         ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
3498                         simode0 = ahd_inb(ahd, SIMODE0);
3499                         simode3 = ahd_inb(ahd, SIMODE3);
3500                         lqimode0 = ahd_inb(ahd, LQIMODE0);
3501                         lqimode1 = ahd_inb(ahd, LQIMODE1);
3502                         lqomode0 = ahd_inb(ahd, LQOMODE0);
3503                         lqomode1 = ahd_inb(ahd, LQOMODE1);
3504                         ahd_outb(ahd, SIMODE0, 0);
3505                         ahd_outb(ahd, SIMODE3, 0);
3506                         ahd_outb(ahd, LQIMODE0, 0);
3507                         ahd_outb(ahd, LQIMODE1, 0);
3508                         ahd_outb(ahd, LQOMODE0, 0);
3509                         ahd_outb(ahd, LQOMODE1, 0);
3510                         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
3511                         simode1 = ahd_inb(ahd, SIMODE1);
3512                         /*
3513                          * We don't clear ENBUSFREE.  Unfortunately
3514                          * we cannot re-enable busfree detection within
3515                          * the current connection, so we must leave it
3516                          * on while single stepping.
3517                          */
3518                         ahd_outb(ahd, SIMODE1, simode1 & ENBUSFREE);
3519                         ahd_outb(ahd, SEQCTL0, ahd_inb(ahd, SEQCTL0) | STEP);
3520                         stepping = TRUE;
3521                 }
3522                 ahd_outb(ahd, CLRSINT1, CLRBUSFREE);
3523                 ahd_outb(ahd, CLRINT, CLRSCSIINT);
3524                 ahd_set_modes(ahd, ahd->saved_src_mode, ahd->saved_dst_mode);
3525                 ahd_outb(ahd, HCNTRL, ahd->unpause);
3526                 while (!ahd_is_paused(ahd))
3527                         ahd_delay(200);
3528                 ahd_update_modes(ahd);
3529         }
3530         if (stepping) {
3531                 ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
3532                 ahd_outb(ahd, SIMODE0, simode0);
3533                 ahd_outb(ahd, SIMODE3, simode3);
3534                 ahd_outb(ahd, LQIMODE0, lqimode0);
3535                 ahd_outb(ahd, LQIMODE1, lqimode1);
3536                 ahd_outb(ahd, LQOMODE0, lqomode0);
3537                 ahd_outb(ahd, LQOMODE1, lqomode1);
3538                 ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
3539                 ahd_outb(ahd, SEQCTL0, ahd_inb(ahd, SEQCTL0) & ~STEP);
3540                 ahd_outb(ahd, SIMODE1, simode1);
3541                 /*
3542                  * SCSIINT seems to glitch occassionally when
3543                  * the interrupt masks are restored.  Clear SCSIINT
3544                  * one more time so that only persistent errors
3545                  * are seen as a real interrupt.
3546                  */
3547                 ahd_outb(ahd, CLRINT, CLRSCSIINT);
3548         }
3549         ahd_restore_modes(ahd, saved_modes);
3550 }
3551
3552 /*
3553  * Clear any pending interrupt status.
3554  */
3555 static void
3556 ahd_clear_intstat(struct ahd_softc *ahd)
3557 {
3558         AHD_ASSERT_MODES(ahd, ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK),
3559                          ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK));
3560         /* Clear any interrupt conditions this may have caused */
3561         ahd_outb(ahd, CLRLQIINT0, CLRLQIATNQAS|CLRLQICRCT1|CLRLQICRCT2
3562                                  |CLRLQIBADLQT|CLRLQIATNLQ|CLRLQIATNCMD);
3563         ahd_outb(ahd, CLRLQIINT1, CLRLQIPHASE_LQ|CLRLQIPHASE_NLQ|CLRLIQABORT
3564                                  |CLRLQICRCI_LQ|CLRLQICRCI_NLQ|CLRLQIBADLQI
3565                                  |CLRLQIOVERI_LQ|CLRLQIOVERI_NLQ|CLRNONPACKREQ);
3566         ahd_outb(ahd, CLRLQOINT0, CLRLQOTARGSCBPERR|CLRLQOSTOPT2|CLRLQOATNLQ
3567                                  |CLRLQOATNPKT|CLRLQOTCRC);
3568         ahd_outb(ahd, CLRLQOINT1, CLRLQOINITSCBPERR|CLRLQOSTOPI2|CLRLQOBADQAS
3569                                  |CLRLQOBUSFREE|CLRLQOPHACHGINPKT);
3570         if ((ahd->bugs & AHD_CLRLQO_AUTOCLR_BUG) != 0) {
3571                 ahd_outb(ahd, CLRLQOINT0, 0);
3572                 ahd_outb(ahd, CLRLQOINT1, 0);
3573         }
3574         ahd_outb(ahd, CLRSINT3, CLRNTRAMPERR|CLROSRAMPERR);
3575         ahd_outb(ahd, CLRSINT1, CLRSELTIMEO|CLRATNO|CLRSCSIRSTI
3576                                 |CLRBUSFREE|CLRSCSIPERR|CLRREQINIT);
3577         ahd_outb(ahd, CLRSINT0, CLRSELDO|CLRSELDI|CLRSELINGO
3578                                 |CLRIOERR|CLROVERRUN);
3579         ahd_outb(ahd, CLRINT, CLRSCSIINT);
3580 }
3581
3582 /**************************** Debugging Routines ******************************/
3583 #ifdef AHD_DEBUG
3584 uint32_t ahd_debug = AHD_DEBUG_OPTS;
3585 #endif
3586
3587 #if 0
3588 void
3589 ahd_print_scb(struct scb *scb)
3590 {
3591         struct hardware_scb *hscb;
3592         int i;
3593
3594         hscb = scb->hscb;
3595         printf("scb:%p control:0x%x scsiid:0x%x lun:%d cdb_len:%d\n",
3596                (void *)scb,
3597                hscb->control,
3598                hscb->scsiid,
3599                hscb->lun,
3600                hscb->cdb_len);
3601         printf("Shared Data: ");
3602         for (i = 0; i < sizeof(hscb->shared_data.idata.cdb); i++)
3603                 printf("%#02x", hscb->shared_data.idata.cdb[i]);
3604         printf("        dataptr:%#x%x datacnt:%#x sgptr:%#x tag:%#x\n",
3605                (uint32_t)((ahd_le64toh(hscb->dataptr) >> 32) & 0xFFFFFFFF),
3606                (uint32_t)(ahd_le64toh(hscb->dataptr) & 0xFFFFFFFF),
3607                ahd_le32toh(hscb->datacnt),
3608                ahd_le32toh(hscb->sgptr),
3609                SCB_GET_TAG(scb));
3610         ahd_dump_sglist(scb);
3611 }
3612 #endif  /*  0  */
3613
3614 /************************* Transfer Negotiation *******************************/
3615 /*
3616  * Allocate per target mode instance (ID we respond to as a target)
3617  * transfer negotiation data structures.
3618  */
3619 static struct ahd_tmode_tstate *
3620 ahd_alloc_tstate(struct ahd_softc *ahd, u_int scsi_id, char channel)
3621 {
3622         struct ahd_tmode_tstate *master_tstate;
3623         struct ahd_tmode_tstate *tstate;
3624         int i;
3625
3626         master_tstate = ahd->enabled_targets[ahd->our_id];
3627         if (ahd->enabled_targets[scsi_id] != NULL
3628          && ahd->enabled_targets[scsi_id] != master_tstate)
3629                 panic("%s: ahd_alloc_tstate - Target already allocated",
3630                       ahd_name(ahd));
3631         tstate = malloc(sizeof(*tstate), M_DEVBUF, M_NOWAIT);
3632         if (tstate == NULL)
3633                 return (NULL);
3634
3635         /*
3636          * If we have allocated a master tstate, copy user settings from
3637          * the master tstate (taken from SRAM or the EEPROM) for this
3638          * channel, but reset our current and goal settings to async/narrow
3639          * until an initiator talks to us.
3640          */
3641         if (master_tstate != NULL) {
3642                 memcpy(tstate, master_tstate, sizeof(*tstate));
3643                 memset(tstate->enabled_luns, 0, sizeof(tstate->enabled_luns));
3644                 for (i = 0; i < 16; i++) {
3645                         memset(&tstate->transinfo[i].curr, 0,
3646                               sizeof(tstate->transinfo[i].curr));
3647                         memset(&tstate->transinfo[i].goal, 0,
3648                               sizeof(tstate->transinfo[i].goal));
3649                 }
3650         } else
3651                 memset(tstate, 0, sizeof(*tstate));
3652         ahd->enabled_targets[scsi_id] = tstate;
3653         return (tstate);
3654 }
3655
3656 #ifdef AHD_TARGET_MODE
3657 /*
3658  * Free per target mode instance (ID we respond to as a target)
3659  * transfer negotiation data structures.
3660  */
3661 static void
3662 ahd_free_tstate(struct ahd_softc *ahd, u_int scsi_id, char channel, int force)
3663 {
3664         struct ahd_tmode_tstate *tstate;
3665
3666         /*
3667          * Don't clean up our "master" tstate.
3668          * It has our default user settings.
3669          */
3670         if (scsi_id == ahd->our_id
3671          && force == FALSE)
3672                 return;
3673
3674         tstate = ahd->enabled_targets[scsi_id];
3675         if (tstate != NULL)
3676                 free(tstate, M_DEVBUF);
3677         ahd->enabled_targets[scsi_id] = NULL;
3678 }
3679 #endif
3680
3681 /*
3682  * Called when we have an active connection to a target on the bus,
3683  * this function finds the nearest period to the input period limited
3684  * by the capabilities of the bus connectivity of and sync settings for
3685  * the target.
3686  */
3687 static void
3688 ahd_devlimited_syncrate(struct ahd_softc *ahd,
3689                         struct ahd_initiator_tinfo *tinfo,
3690                         u_int *period, u_int *ppr_options, role_t role)
3691 {
3692         struct  ahd_transinfo *transinfo;
3693         u_int   maxsync;
3694
3695         if ((ahd_inb(ahd, SBLKCTL) & ENAB40) != 0
3696          && (ahd_inb(ahd, SSTAT2) & EXP_ACTIVE) == 0) {
3697                 maxsync = AHD_SYNCRATE_PACED;
3698         } else {
3699                 maxsync = AHD_SYNCRATE_ULTRA;
3700                 /* Can't do DT related options on an SE bus */
3701                 *ppr_options &= MSG_EXT_PPR_QAS_REQ;
3702         }
3703         /*
3704          * Never allow a value higher than our current goal
3705          * period otherwise we may allow a target initiated
3706          * negotiation to go above the limit as set by the
3707          * user.  In the case of an initiator initiated
3708          * sync negotiation, we limit based on the user
3709          * setting.  This allows the system to still accept
3710          * incoming negotiations even if target initiated
3711          * negotiation is not performed.
3712          */
3713         if (role == ROLE_TARGET)
3714                 transinfo = &tinfo->user;
3715         else
3716                 transinfo = &tinfo->goal;
3717         *ppr_options &= (transinfo->ppr_options|MSG_EXT_PPR_PCOMP_EN);
3718         if (transinfo->width == MSG_EXT_WDTR_BUS_8_BIT) {
3719                 maxsync = max(maxsync, (u_int)AHD_SYNCRATE_ULTRA2);
3720                 *ppr_options &= ~MSG_EXT_PPR_DT_REQ;
3721         }
3722         if (transinfo->period == 0) {
3723                 *period = 0;
3724                 *ppr_options = 0;
3725         } else {
3726                 *period = max(*period, (u_int)transinfo->period);
3727                 ahd_find_syncrate(ahd, period, ppr_options, maxsync);
3728         }
3729 }
3730
3731 /*
3732  * Look up the valid period to SCSIRATE conversion in our table.
3733  * Return the period and offset that should be sent to the target
3734  * if this was the beginning of an SDTR.
3735  */
3736 void
3737 ahd_find_syncrate(struct ahd_softc *ahd, u_int *period,
3738                   u_int *ppr_options, u_int maxsync)
3739 {
3740         if (*period < maxsync)
3741                 *period = maxsync;
3742
3743         if ((*ppr_options & MSG_EXT_PPR_DT_REQ) != 0
3744          && *period > AHD_SYNCRATE_MIN_DT)
3745                 *ppr_options &= ~MSG_EXT_PPR_DT_REQ;
3746
3747         if (*period > AHD_SYNCRATE_MIN)
3748                 *period = 0;
3749
3750         /* Honor PPR option conformance rules. */
3751         if (*period > AHD_SYNCRATE_PACED)
3752                 *ppr_options &= ~MSG_EXT_PPR_RTI;
3753
3754         if ((*ppr_options & MSG_EXT_PPR_IU_REQ) == 0)
3755                 *ppr_options &= (MSG_EXT_PPR_DT_REQ|MSG_EXT_PPR_QAS_REQ);
3756
3757         if ((*ppr_options & MSG_EXT_PPR_DT_REQ) == 0)
3758                 *ppr_options &= MSG_EXT_PPR_QAS_REQ;
3759
3760         /* Skip all PACED only entries if IU is not available */
3761         if ((*ppr_options & MSG_EXT_PPR_IU_REQ) == 0
3762          && *period < AHD_SYNCRATE_DT)
3763                 *period = AHD_SYNCRATE_DT;
3764
3765         /* Skip all DT only entries if DT is not available */
3766         if ((*ppr_options & MSG_EXT_PPR_DT_REQ) == 0
3767          && *period < AHD_SYNCRATE_ULTRA2)
3768                 *period = AHD_SYNCRATE_ULTRA2;
3769 }
3770
3771 /*
3772  * Truncate the given synchronous offset to a value the
3773  * current adapter type and syncrate are capable of.
3774  */
3775 static void
3776 ahd_validate_offset(struct ahd_softc *ahd,
3777                     struct ahd_initiator_tinfo *tinfo,
3778                     u_int period, u_int *offset, int wide,
3779                     role_t role)
3780 {
3781         u_int maxoffset;
3782
3783         /* Limit offset to what we can do */
3784         if (period == 0)
3785                 maxoffset = 0;
3786         else if (period <= AHD_SYNCRATE_PACED) {
3787                 if ((ahd->bugs & AHD_PACED_NEGTABLE_BUG) != 0)
3788                         maxoffset = MAX_OFFSET_PACED_BUG;
3789                 else
3790                         maxoffset = MAX_OFFSET_PACED;
3791         } else
3792                 maxoffset = MAX_OFFSET_NON_PACED;
3793         *offset = min(*offset, maxoffset);
3794         if (tinfo != NULL) {
3795                 if (role == ROLE_TARGET)
3796                         *offset = min(*offset, (u_int)tinfo->user.offset);
3797                 else
3798                         *offset = min(*offset, (u_int)tinfo->goal.offset);
3799         }
3800 }
3801
3802 /*
3803  * Truncate the given transfer width parameter to a value the
3804  * current adapter type is capable of.
3805  */
3806 static void
3807 ahd_validate_width(struct ahd_softc *ahd, struct ahd_initiator_tinfo *tinfo,
3808                    u_int *bus_width, role_t role)
3809 {
3810         switch (*bus_width) {
3811         default:
3812                 if (ahd->features & AHD_WIDE) {
3813                         /* Respond Wide */
3814                         *bus_width = MSG_EXT_WDTR_BUS_16_BIT;
3815                         break;
3816                 }
3817                 /* FALLTHROUGH */
3818         case MSG_EXT_WDTR_BUS_8_BIT:
3819                 *bus_width = MSG_EXT_WDTR_BUS_8_BIT;
3820                 break;
3821         }
3822         if (tinfo != NULL) {
3823                 if (role == ROLE_TARGET)
3824                         *bus_width = min((u_int)tinfo->user.width, *bus_width);
3825                 else
3826                         *bus_width = min((u_int)tinfo->goal.width, *bus_width);
3827         }
3828 }
3829
3830 /*
3831  * Update the bitmask of targets for which the controller should
3832  * negotiate with at the next convenient oportunity.  This currently
3833  * means the next time we send the initial identify messages for
3834  * a new transaction.
3835  */
3836 int
3837 ahd_update_neg_request(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
3838                        struct ahd_tmode_tstate *tstate,
3839                        struct ahd_initiator_tinfo *tinfo, ahd_neg_type neg_type)
3840 {
3841         u_int auto_negotiate_orig;
3842
3843         auto_negotiate_orig = tstate->auto_negotiate;
3844         if (neg_type == AHD_NEG_ALWAYS) {
3845                 /*
3846                  * Force our "current" settings to be
3847                  * unknown so that unless a bus reset
3848                  * occurs the need to renegotiate is
3849                  * recorded persistently.
3850                  */
3851                 if ((ahd->features & AHD_WIDE) != 0)
3852                         tinfo->curr.width = AHD_WIDTH_UNKNOWN;
3853                 tinfo->curr.period = AHD_PERIOD_UNKNOWN;
3854                 tinfo->curr.offset = AHD_OFFSET_UNKNOWN;
3855         }
3856         if (tinfo->curr.period != tinfo->goal.period
3857          || tinfo->curr.width != tinfo->goal.width
3858          || tinfo->curr.offset != tinfo->goal.offset
3859          || tinfo->curr.ppr_options != tinfo->goal.ppr_options
3860          || (neg_type == AHD_NEG_IF_NON_ASYNC
3861           && (tinfo->goal.offset != 0
3862            || tinfo->goal.width != MSG_EXT_WDTR_BUS_8_BIT
3863            || tinfo->goal.ppr_options != 0)))
3864                 tstate->auto_negotiate |= devinfo->target_mask;
3865         else
3866                 tstate->auto_negotiate &= ~devinfo->target_mask;
3867
3868         return (auto_negotiate_orig != tstate->auto_negotiate);
3869 }
3870
3871 /*
3872  * Update the user/goal/curr tables of synchronous negotiation
3873  * parameters as well as, in the case of a current or active update,
3874  * any data structures on the host controller.  In the case of an
3875  * active update, the specified target is currently talking to us on
3876  * the bus, so the transfer parameter update must take effect
3877  * immediately.
3878  */
3879 void
3880 ahd_set_syncrate(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
3881                  u_int period, u_int offset, u_int ppr_options,
3882                  u_int type, int paused)
3883 {
3884         struct  ahd_initiator_tinfo *tinfo;
3885         struct  ahd_tmode_tstate *tstate;
3886         u_int   old_period;
3887         u_int   old_offset;
3888         u_int   old_ppr;
3889         int     active;
3890         int     update_needed;
3891
3892         active = (type & AHD_TRANS_ACTIVE) == AHD_TRANS_ACTIVE;
3893         update_needed = 0;
3894
3895         if (period == 0 || offset == 0) {
3896                 period = 0;
3897                 offset = 0;
3898         }
3899
3900         tinfo = ahd_fetch_transinfo(ahd, devinfo->channel, devinfo->our_scsiid,
3901                                     devinfo->target, &tstate);
3902
3903         if ((type & AHD_TRANS_USER) != 0) {
3904                 tinfo->user.period = period;
3905                 tinfo->user.offset = offset;
3906                 tinfo->user.ppr_options = ppr_options;
3907         }
3908
3909         if ((type & AHD_TRANS_GOAL) != 0) {
3910                 tinfo->goal.period = period;
3911                 tinfo->goal.offset = offset;
3912                 tinfo->goal.ppr_options = ppr_options;
3913         }
3914
3915         old_period = tinfo->curr.period;
3916         old_offset = tinfo->curr.offset;
3917         old_ppr    = tinfo->curr.ppr_options;
3918
3919         if ((type & AHD_TRANS_CUR) != 0
3920          && (old_period != period
3921           || old_offset != offset
3922           || old_ppr != ppr_options)) {
3923
3924                 update_needed++;
3925
3926                 tinfo->curr.period = period;
3927                 tinfo->curr.offset = offset;
3928                 tinfo->curr.ppr_options = ppr_options;
3929
3930                 ahd_send_async(ahd, devinfo->channel, devinfo->target,
3931                                CAM_LUN_WILDCARD, AC_TRANSFER_NEG);
3932                 if (bootverbose) {
3933                         if (offset != 0) {
3934                                 int options;
3935
3936                                 printf("%s: target %d synchronous with "
3937                                        "period = 0x%x, offset = 0x%x",
3938                                        ahd_name(ahd), devinfo->target,
3939                                        period, offset);
3940                                 options = 0;
3941                                 if ((ppr_options & MSG_EXT_PPR_RD_STRM) != 0) {
3942                                         printf("(RDSTRM");
3943                                         options++;
3944                                 }
3945                                 if ((ppr_options & MSG_EXT_PPR_DT_REQ) != 0) {
3946                                         printf("%s", options ? "|DT" : "(DT");
3947                                         options++;
3948                                 }
3949                                 if ((ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
3950                                         printf("%s", options ? "|IU" : "(IU");
3951                                         options++;
3952                                 }
3953                                 if ((ppr_options & MSG_EXT_PPR_RTI) != 0) {
3954                                         printf("%s", options ? "|RTI" : "(RTI");
3955                                         options++;
3956                                 }
3957                                 if ((ppr_options & MSG_EXT_PPR_QAS_REQ) != 0) {
3958                                         printf("%s", options ? "|QAS" : "(QAS");
3959                                         options++;
3960                                 }
3961                                 if (options != 0)
3962                                         printf(")\n");
3963                                 else
3964                                         printf("\n");
3965                         } else {
3966                                 printf("%s: target %d using "
3967                                        "asynchronous transfers%s\n",
3968                                        ahd_name(ahd), devinfo->target,
3969                                        (ppr_options & MSG_EXT_PPR_QAS_REQ) != 0
3970                                      ?  "(QAS)" : "");
3971                         }
3972                 }
3973         }
3974         /*
3975          * Always refresh the neg-table to handle the case of the
3976          * sequencer setting the ENATNO bit for a MK_MESSAGE request.
3977          * We will always renegotiate in that case if this is a
3978          * packetized request.  Also manage the busfree expected flag
3979          * from this common routine so that we catch changes due to
3980          * WDTR or SDTR messages.
3981          */
3982         if ((type & AHD_TRANS_CUR) != 0) {
3983                 if (!paused)
3984                         ahd_pause(ahd);
3985                 ahd_update_neg_table(ahd, devinfo, &tinfo->curr);
3986                 if (!paused)
3987                         ahd_unpause(ahd);
3988                 if (ahd->msg_type != MSG_TYPE_NONE) {
3989                         if ((old_ppr & MSG_EXT_PPR_IU_REQ)
3990                          != (ppr_options & MSG_EXT_PPR_IU_REQ)) {
3991 #ifdef AHD_DEBUG
3992                                 if ((ahd_debug & AHD_SHOW_MESSAGES) != 0) {
3993                                         ahd_print_devinfo(ahd, devinfo);
3994                                         printf("Expecting IU Change busfree\n");
3995                                 }
3996 #endif
3997                                 ahd->msg_flags |= MSG_FLAG_EXPECT_PPR_BUSFREE
3998                                                |  MSG_FLAG_IU_REQ_CHANGED;
3999                         }
4000                         if ((old_ppr & MSG_EXT_PPR_IU_REQ) != 0) {
4001 #ifdef AHD_DEBUG
4002                                 if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
4003                                         printf("PPR with IU_REQ outstanding\n");
4004 #endif
4005                                 ahd->msg_flags |= MSG_FLAG_EXPECT_PPR_BUSFREE;
4006                         }
4007                 }
4008         }
4009
4010         update_needed += ahd_update_neg_request(ahd, devinfo, tstate,
4011                                                 tinfo, AHD_NEG_TO_GOAL);
4012
4013         if (update_needed && active)
4014                 ahd_update_pending_scbs(ahd);
4015 }
4016
4017 /*
4018  * Update the user/goal/curr tables of wide negotiation
4019  * parameters as well as, in the case of a current or active update,
4020  * any data structures on the host controller.  In the case of an
4021  * active update, the specified target is currently talking to us on
4022  * the bus, so the transfer parameter update must take effect
4023  * immediately.
4024  */
4025 void
4026 ahd_set_width(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
4027               u_int width, u_int type, int paused)
4028 {
4029         struct  ahd_initiator_tinfo *tinfo;
4030         struct  ahd_tmode_tstate *tstate;
4031         u_int   oldwidth;
4032         int     active;
4033         int     update_needed;
4034
4035         active = (type & AHD_TRANS_ACTIVE) == AHD_TRANS_ACTIVE;
4036         update_needed = 0;
4037         tinfo = ahd_fetch_transinfo(ahd, devinfo->channel, devinfo->our_scsiid,
4038                                     devinfo->target, &tstate);
4039
4040         if ((type & AHD_TRANS_USER) != 0)
4041                 tinfo->user.width = width;
4042
4043         if ((type & AHD_TRANS_GOAL) != 0)
4044                 tinfo->goal.width = width;
4045
4046         oldwidth = tinfo->curr.width;
4047         if ((type & AHD_TRANS_CUR) != 0 && oldwidth != width) {
4048
4049                 update_needed++;
4050
4051                 tinfo->curr.width = width;
4052                 ahd_send_async(ahd, devinfo->channel, devinfo->target,
4053                                CAM_LUN_WILDCARD, AC_TRANSFER_NEG);
4054                 if (bootverbose) {
4055                         printf("%s: target %d using %dbit transfers\n",
4056                                ahd_name(ahd), devinfo->target,
4057                                8 * (0x01 << width));
4058                 }
4059         }
4060
4061         if ((type & AHD_TRANS_CUR) != 0) {
4062                 if (!paused)
4063                         ahd_pause(ahd);
4064                 ahd_update_neg_table(ahd, devinfo, &tinfo->curr);
4065                 if (!paused)
4066                         ahd_unpause(ahd);
4067         }
4068
4069         update_needed += ahd_update_neg_request(ahd, devinfo, tstate,
4070                                                 tinfo, AHD_NEG_TO_GOAL);
4071         if (update_needed && active)
4072                 ahd_update_pending_scbs(ahd);
4073
4074 }
4075
4076 /*
4077  * Update the current state of tagged queuing for a given target.
4078  */
4079 static void
4080 ahd_set_tags(struct ahd_softc *ahd, struct scsi_cmnd *cmd,
4081              struct ahd_devinfo *devinfo, ahd_queue_alg alg)
4082 {
4083         struct scsi_device *sdev = cmd->device;
4084
4085         ahd_platform_set_tags(ahd, sdev, devinfo, alg);
4086         ahd_send_async(ahd, devinfo->channel, devinfo->target,
4087                        devinfo->lun, AC_TRANSFER_NEG);
4088 }
4089
4090 static void
4091 ahd_update_neg_table(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
4092                      struct ahd_transinfo *tinfo)
4093 {
4094         ahd_mode_state  saved_modes;
4095         u_int           period;
4096         u_int           ppr_opts;
4097         u_int           con_opts;
4098         u_int           offset;
4099         u_int           saved_negoaddr;
4100         uint8_t         iocell_opts[sizeof(ahd->iocell_opts)];
4101
4102         saved_modes = ahd_save_modes(ahd);
4103         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
4104
4105         saved_negoaddr = ahd_inb(ahd, NEGOADDR);
4106         ahd_outb(ahd, NEGOADDR, devinfo->target);
4107         period = tinfo->period;
4108         offset = tinfo->offset;
4109         memcpy(iocell_opts, ahd->iocell_opts, sizeof(ahd->iocell_opts));
4110         ppr_opts = tinfo->ppr_options & (MSG_EXT_PPR_QAS_REQ|MSG_EXT_PPR_DT_REQ
4111                                         |MSG_EXT_PPR_IU_REQ|MSG_EXT_PPR_RTI);
4112         con_opts = 0;
4113         if (period == 0)
4114                 period = AHD_SYNCRATE_ASYNC;
4115         if (period == AHD_SYNCRATE_160) {
4116
4117                 if ((ahd->bugs & AHD_PACED_NEGTABLE_BUG) != 0) {
4118                         /*
4119                          * When the SPI4 spec was finalized, PACE transfers
4120                          * was not made a configurable option in the PPR
4121                          * message.  Instead it is assumed to be enabled for
4122                          * any syncrate faster than 80MHz.  Nevertheless,
4123                          * Harpoon2A4 allows this to be configurable.
4124                          *
4125                          * Harpoon2A4 also assumes at most 2 data bytes per
4126                          * negotiated REQ/ACK offset.  Paced transfers take
4127                          * 4, so we must adjust our offset.
4128                          */
4129                         ppr_opts |= PPROPT_PACE;
4130                         offset *= 2;
4131
4132                         /*
4133                          * Harpoon2A assumed that there would be a
4134                          * fallback rate between 160MHz and 80MHz,
4135                          * so 7 is used as the period factor rather
4136                          * than 8 for 160MHz.
4137                          */
4138                         period = AHD_SYNCRATE_REVA_160;
4139                 }
4140                 if ((tinfo->ppr_options & MSG_EXT_PPR_PCOMP_EN) == 0)
4141                         iocell_opts[AHD_PRECOMP_SLEW_INDEX] &=
4142                             ~AHD_PRECOMP_MASK;
4143         } else {
4144                 /*
4145                  * Precomp should be disabled for non-paced transfers.
4146                  */
4147                 iocell_opts[AHD_PRECOMP_SLEW_INDEX] &= ~AHD_PRECOMP_MASK;
4148
4149                 if ((ahd->features & AHD_NEW_IOCELL_OPTS) != 0
4150                  && (ppr_opts & MSG_EXT_PPR_DT_REQ) != 0
4151                  && (ppr_opts & MSG_EXT_PPR_IU_REQ) == 0) {
4152                         /*
4153                          * Slow down our CRC interval to be
4154                          * compatible with non-packetized
4155                          * U160 devices that can't handle a
4156                          * CRC at full speed.
4157                          */
4158                         con_opts |= ENSLOWCRC;
4159                 }
4160
4161                 if ((ahd->bugs & AHD_PACED_NEGTABLE_BUG) != 0) {
4162                         /*
4163                          * On H2A4, revert to a slower slewrate
4164                          * on non-paced transfers.
4165                          */
4166                         iocell_opts[AHD_PRECOMP_SLEW_INDEX] &=
4167                             ~AHD_SLEWRATE_MASK;
4168                 }
4169         }
4170
4171         ahd_outb(ahd, ANNEXCOL, AHD_ANNEXCOL_PRECOMP_SLEW);
4172         ahd_outb(ahd, ANNEXDAT, iocell_opts[AHD_PRECOMP_SLEW_INDEX]);
4173         ahd_outb(ahd, ANNEXCOL, AHD_ANNEXCOL_AMPLITUDE);
4174         ahd_outb(ahd, ANNEXDAT, iocell_opts[AHD_AMPLITUDE_INDEX]);
4175
4176         ahd_outb(ahd, NEGPERIOD, period);
4177         ahd_outb(ahd, NEGPPROPTS, ppr_opts);
4178         ahd_outb(ahd, NEGOFFSET, offset);
4179
4180         if (tinfo->width == MSG_EXT_WDTR_BUS_16_BIT)
4181                 con_opts |= WIDEXFER;
4182
4183         /*
4184          * Slow down our CRC interval to be
4185          * compatible with packetized U320 devices
4186          * that can't handle a CRC at full speed
4187          */
4188         if (ahd->features & AHD_AIC79XXB_SLOWCRC) {
4189                 con_opts |= ENSLOWCRC;
4190         }
4191
4192         /*
4193          * During packetized transfers, the target will
4194          * give us the oportunity to send command packets
4195          * without us asserting attention.
4196          */
4197         if ((tinfo->ppr_options & MSG_EXT_PPR_IU_REQ) == 0)
4198                 con_opts |= ENAUTOATNO;
4199         ahd_outb(ahd, NEGCONOPTS, con_opts);
4200         ahd_outb(ahd, NEGOADDR, saved_negoaddr);
4201         ahd_restore_modes(ahd, saved_modes);
4202 }
4203
4204 /*
4205  * When the transfer settings for a connection change, setup for
4206  * negotiation in pending SCBs to effect the change as quickly as
4207  * possible.  We also cancel any negotiations that are scheduled
4208  * for inflight SCBs that have not been started yet.
4209  */
4210 static void
4211 ahd_update_pending_scbs(struct ahd_softc *ahd)
4212 {
4213         struct          scb *pending_scb;
4214         int             pending_scb_count;
4215         int             paused;
4216         u_int           saved_scbptr;
4217         ahd_mode_state  saved_modes;
4218
4219         /*
4220          * Traverse the pending SCB list and ensure that all of the
4221          * SCBs there have the proper settings.  We can only safely
4222          * clear the negotiation required flag (setting requires the
4223          * execution queue to be modified) and this is only possible
4224          * if we are not already attempting to select out for this
4225          * SCB.  For this reason, all callers only call this routine
4226          * if we are changing the negotiation settings for the currently
4227          * active transaction on the bus.
4228          */
4229         pending_scb_count = 0;
4230         LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
4231                 struct ahd_devinfo devinfo;
4232                 struct ahd_initiator_tinfo *tinfo;
4233                 struct ahd_tmode_tstate *tstate;
4234
4235                 ahd_scb_devinfo(ahd, &devinfo, pending_scb);
4236                 tinfo = ahd_fetch_transinfo(ahd, devinfo.channel,
4237                                             devinfo.our_scsiid,
4238                                             devinfo.target, &tstate);
4239                 if ((tstate->auto_negotiate & devinfo.target_mask) == 0
4240                  && (pending_scb->flags & SCB_AUTO_NEGOTIATE) != 0) {
4241                         pending_scb->flags &= ~SCB_AUTO_NEGOTIATE;
4242                         pending_scb->hscb->control &= ~MK_MESSAGE;
4243                 }
4244                 ahd_sync_scb(ahd, pending_scb,
4245                              BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
4246                 pending_scb_count++;
4247         }
4248
4249         if (pending_scb_count == 0)
4250                 return;
4251
4252         if (ahd_is_paused(ahd)) {
4253                 paused = 1;
4254         } else {
4255                 paused = 0;
4256                 ahd_pause(ahd);
4257         }
4258
4259         /*
4260          * Force the sequencer to reinitialize the selection for
4261          * the command at the head of the execution queue if it
4262          * has already been setup.  The negotiation changes may
4263          * effect whether we select-out with ATN.  It is only
4264          * safe to clear ENSELO when the bus is not free and no
4265          * selection is in progres or completed.
4266          */
4267         saved_modes = ahd_save_modes(ahd);
4268         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
4269         if ((ahd_inb(ahd, SCSISIGI) & BSYI) != 0
4270          && (ahd_inb(ahd, SSTAT0) & (SELDO|SELINGO)) == 0)
4271                 ahd_outb(ahd, SCSISEQ0, ahd_inb(ahd, SCSISEQ0) & ~ENSELO);
4272         saved_scbptr = ahd_get_scbptr(ahd);
4273         /* Ensure that the hscbs down on the card match the new information */
4274         LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
4275                 u_int   scb_tag;
4276                 u_int   control;
4277
4278                 scb_tag = SCB_GET_TAG(pending_scb);
4279                 ahd_set_scbptr(ahd, scb_tag);
4280                 control = ahd_inb_scbram(ahd, SCB_CONTROL);
4281                 control &= ~MK_MESSAGE;
4282                 control |= pending_scb->hscb->control & MK_MESSAGE;
4283                 ahd_outb(ahd, SCB_CONTROL, control);
4284         }
4285         ahd_set_scbptr(ahd, saved_scbptr);
4286         ahd_restore_modes(ahd, saved_modes);
4287
4288         if (paused == 0)
4289                 ahd_unpause(ahd);
4290 }
4291
4292 /**************************** Pathing Information *****************************/
4293 static void
4294 ahd_fetch_devinfo(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
4295 {
4296         ahd_mode_state  saved_modes;
4297         u_int           saved_scsiid;
4298         role_t          role;
4299         int             our_id;
4300
4301         saved_modes = ahd_save_modes(ahd);
4302         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
4303
4304         if (ahd_inb(ahd, SSTAT0) & TARGET)
4305                 role = ROLE_TARGET;
4306         else
4307                 role = ROLE_INITIATOR;
4308
4309         if (role == ROLE_TARGET
4310          && (ahd_inb(ahd, SEQ_FLAGS) & CMDPHASE_PENDING) != 0) {
4311                 /* We were selected, so pull our id from TARGIDIN */
4312                 our_id = ahd_inb(ahd, TARGIDIN) & OID;
4313         } else if (role == ROLE_TARGET)
4314                 our_id = ahd_inb(ahd, TOWNID);
4315         else
4316                 our_id = ahd_inb(ahd, IOWNID);
4317
4318         saved_scsiid = ahd_inb(ahd, SAVED_SCSIID);
4319         ahd_compile_devinfo(devinfo,
4320                             our_id,
4321                             SCSIID_TARGET(ahd, saved_scsiid),
4322                             ahd_inb(ahd, SAVED_LUN),
4323                             SCSIID_CHANNEL(ahd, saved_scsiid),
4324                             role);
4325         ahd_restore_modes(ahd, saved_modes);
4326 }
4327
4328 void
4329 ahd_print_devinfo(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
4330 {
4331         printf("%s:%c:%d:%d: ", ahd_name(ahd), 'A',
4332                devinfo->target, devinfo->lun);
4333 }
4334
4335 static const struct ahd_phase_table_entry*
4336 ahd_lookup_phase_entry(int phase)
4337 {
4338         const struct ahd_phase_table_entry *entry;
4339         const struct ahd_phase_table_entry *last_entry;
4340
4341         /*
4342          * num_phases doesn't include the default entry which
4343          * will be returned if the phase doesn't match.
4344          */
4345         last_entry = &ahd_phase_table[num_phases];
4346         for (entry = ahd_phase_table; entry < last_entry; entry++) {
4347                 if (phase == entry->phase)
4348                         break;
4349         }
4350         return (entry);
4351 }
4352
4353 void
4354 ahd_compile_devinfo(struct ahd_devinfo *devinfo, u_int our_id, u_int target,
4355                     u_int lun, char channel, role_t role)
4356 {
4357         devinfo->our_scsiid = our_id;
4358         devinfo->target = target;
4359         devinfo->lun = lun;
4360         devinfo->target_offset = target;
4361         devinfo->channel = channel;
4362         devinfo->role = role;
4363         if (channel == 'B')
4364                 devinfo->target_offset += 8;
4365         devinfo->target_mask = (0x01 << devinfo->target_offset);
4366 }
4367
4368 static void
4369 ahd_scb_devinfo(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
4370                 struct scb *scb)
4371 {
4372         role_t  role;
4373         int     our_id;
4374
4375         our_id = SCSIID_OUR_ID(scb->hscb->scsiid);
4376         role = ROLE_INITIATOR;
4377         if ((scb->hscb->control & TARGET_SCB) != 0)
4378                 role = ROLE_TARGET;
4379         ahd_compile_devinfo(devinfo, our_id, SCB_GET_TARGET(ahd, scb),
4380                             SCB_GET_LUN(scb), SCB_GET_CHANNEL(ahd, scb), role);
4381 }
4382
4383
4384 /************************ Message Phase Processing ****************************/
4385 /*
4386  * When an initiator transaction with the MK_MESSAGE flag either reconnects
4387  * or enters the initial message out phase, we are interrupted.  Fill our
4388  * outgoing message buffer with the appropriate message and beging handing
4389  * the message phase(s) manually.
4390  */
4391 static void
4392 ahd_setup_initiator_msgout(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
4393                            struct scb *scb)
4394 {
4395         /*
4396          * To facilitate adding multiple messages together,
4397          * each routine should increment the index and len
4398          * variables instead of setting them explicitly.
4399          */
4400         ahd->msgout_index = 0;
4401         ahd->msgout_len = 0;
4402
4403         if (ahd_currently_packetized(ahd))
4404                 ahd->msg_flags |= MSG_FLAG_PACKETIZED;
4405
4406         if (ahd->send_msg_perror
4407          && ahd_inb(ahd, MSG_OUT) == HOST_MSG) {
4408                 ahd->msgout_buf[ahd->msgout_index++] = ahd->send_msg_perror;
4409                 ahd->msgout_len++;
4410                 ahd->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
4411 #ifdef AHD_DEBUG
4412                 if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
4413                         printf("Setting up for Parity Error delivery\n");
4414 #endif
4415                 return;
4416         } else if (scb == NULL) {
4417                 printf("%s: WARNING. No pending message for "
4418                        "I_T msgin.  Issuing NO-OP\n", ahd_name(ahd));
4419                 ahd->msgout_buf[ahd->msgout_index++] = MSG_NOOP;
4420                 ahd->msgout_len++;
4421                 ahd->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
4422                 return;
4423         }
4424
4425         if ((scb->flags & SCB_DEVICE_RESET) == 0
4426          && (scb->flags & SCB_PACKETIZED) == 0
4427          && ahd_inb(ahd, MSG_OUT) == MSG_IDENTIFYFLAG) {
4428                 u_int identify_msg;
4429
4430                 identify_msg = MSG_IDENTIFYFLAG | SCB_GET_LUN(scb);
4431                 if ((scb->hscb->control & DISCENB) != 0)
4432                         identify_msg |= MSG_IDENTIFY_DISCFLAG;
4433                 ahd->msgout_buf[ahd->msgout_index++] = identify_msg;
4434                 ahd->msgout_len++;
4435
4436                 if ((scb->hscb->control & TAG_ENB) != 0) {
4437                         ahd->msgout_buf[ahd->msgout_index++] =
4438                             scb->hscb->control & (TAG_ENB|SCB_TAG_TYPE);
4439                         ahd->msgout_buf[ahd->msgout_index++] = SCB_GET_TAG(scb);
4440                         ahd->msgout_len += 2;
4441                 }
4442         }
4443
4444         if (scb->flags & SCB_DEVICE_RESET) {
4445                 ahd->msgout_buf[ahd->msgout_index++] = MSG_BUS_DEV_RESET;
4446                 ahd->msgout_len++;
4447                 ahd_print_path(ahd, scb);
4448                 printf("Bus Device Reset Message Sent\n");
4449                 /*
4450                  * Clear our selection hardware in advance of
4451                  * the busfree.  We may have an entry in the waiting
4452                  * Q for this target, and we don't want to go about
4453                  * selecting while we handle the busfree and blow it
4454                  * away.
4455                  */
4456                 ahd_outb(ahd, SCSISEQ0, 0);
4457         } else if ((scb->flags & SCB_ABORT) != 0) {
4458
4459                 if ((scb->hscb->control & TAG_ENB) != 0) {
4460                         ahd->msgout_buf[ahd->msgout_index++] = MSG_ABORT_TAG;
4461                 } else {
4462                         ahd->msgout_buf[ahd->msgout_index++] = MSG_ABORT;
4463                 }
4464                 ahd->msgout_len++;
4465                 ahd_print_path(ahd, scb);
4466                 printf("Abort%s Message Sent\n",
4467                        (scb->hscb->control & TAG_ENB) != 0 ? " Tag" : "");
4468                 /*
4469                  * Clear our selection hardware in advance of
4470                  * the busfree.  We may have an entry in the waiting
4471                  * Q for this target, and we don't want to go about
4472                  * selecting while we handle the busfree and blow it
4473                  * away.
4474                  */
4475                 ahd_outb(ahd, SCSISEQ0, 0);
4476         } else if ((scb->flags & (SCB_AUTO_NEGOTIATE|SCB_NEGOTIATE)) != 0) {
4477                 ahd_build_transfer_msg(ahd, devinfo);
4478                 /*
4479                  * Clear our selection hardware in advance of potential
4480                  * PPR IU status change busfree.  We may have an entry in
4481                  * the waiting Q for this target, and we don't want to go
4482                  * about selecting while we handle the busfree and blow
4483                  * it away.
4484                  */
4485                 ahd_outb(ahd, SCSISEQ0, 0);
4486         } else {
4487                 printf("ahd_intr: AWAITING_MSG for an SCB that "
4488                        "does not have a waiting message\n");
4489                 printf("SCSIID = %x, target_mask = %x\n", scb->hscb->scsiid,
4490                        devinfo->target_mask);
4491                 panic("SCB = %d, SCB Control = %x:%x, MSG_OUT = %x "
4492                       "SCB flags = %x", SCB_GET_TAG(scb), scb->hscb->control,
4493                       ahd_inb_scbram(ahd, SCB_CONTROL), ahd_inb(ahd, MSG_OUT),
4494                       scb->flags);
4495         }
4496
4497         /*
4498          * Clear the MK_MESSAGE flag from the SCB so we aren't
4499          * asked to send this message again.
4500          */
4501         ahd_outb(ahd, SCB_CONTROL,
4502                  ahd_inb_scbram(ahd, SCB_CONTROL) & ~MK_MESSAGE);
4503         scb->hscb->control &= ~MK_MESSAGE;
4504         ahd->msgout_index = 0;
4505         ahd->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
4506 }
4507
4508 /*
4509  * Build an appropriate transfer negotiation message for the
4510  * currently active target.
4511  */
4512 static void
4513 ahd_build_transfer_msg(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
4514 {
4515         /*
4516          * We need to initiate transfer negotiations.
4517          * If our current and goal settings are identical,
4518          * we want to renegotiate due to a check condition.
4519          */
4520         struct  ahd_initiator_tinfo *tinfo;
4521         struct  ahd_tmode_tstate *tstate;
4522         int     dowide;
4523         int     dosync;
4524         int     doppr;
4525         u_int   period;
4526         u_int   ppr_options;
4527         u_int   offset;
4528
4529         tinfo = ahd_fetch_transinfo(ahd, devinfo->channel, devinfo->our_scsiid,
4530                                     devinfo->target, &tstate);
4531         /*
4532          * Filter our period based on the current connection.
4533          * If we can't perform DT transfers on this segment (not in LVD
4534          * mode for instance), then our decision to issue a PPR message
4535          * may change.
4536          */
4537         period = tinfo->goal.period;
4538         offset = tinfo->goal.offset;
4539         ppr_options = tinfo->goal.ppr_options;
4540         /* Target initiated PPR is not allowed in the SCSI spec */
4541         if (devinfo->role == ROLE_TARGET)
4542                 ppr_options = 0;
4543         ahd_devlimited_syncrate(ahd, tinfo, &period,
4544                                 &ppr_options, devinfo->role);
4545         dowide = tinfo->curr.width != tinfo->goal.width;
4546         dosync = tinfo->curr.offset != offset || tinfo->curr.period != period;
4547         /*
4548          * Only use PPR if we have options that need it, even if the device
4549          * claims to support it.  There might be an expander in the way
4550          * that doesn't.
4551          */
4552         doppr = ppr_options != 0;
4553
4554         if (!dowide && !dosync && !doppr) {
4555                 dowide = tinfo->goal.width != MSG_EXT_WDTR_BUS_8_BIT;
4556                 dosync = tinfo->goal.offset != 0;
4557         }
4558
4559         if (!dowide && !dosync && !doppr) {
4560                 /*
4561                  * Force async with a WDTR message if we have a wide bus,
4562                  * or just issue an SDTR with a 0 offset.
4563                  */
4564                 if ((ahd->features & AHD_WIDE) != 0)
4565                         dowide = 1;
4566                 else
4567                         dosync = 1;
4568
4569                 if (bootverbose) {
4570                         ahd_print_devinfo(ahd, devinfo);
4571                         printf("Ensuring async\n");
4572                 }
4573         }
4574         /* Target initiated PPR is not allowed in the SCSI spec */
4575         if (devinfo->role == ROLE_TARGET)
4576                 doppr = 0;
4577
4578         /*
4579          * Both the PPR message and SDTR message require the
4580          * goal syncrate to be limited to what the target device
4581          * is capable of handling (based on whether an LVD->SE
4582          * expander is on the bus), so combine these two cases.
4583          * Regardless, guarantee that if we are using WDTR and SDTR
4584          * messages that WDTR comes first.
4585          */
4586         if (doppr || (dosync && !dowide)) {
4587
4588                 offset = tinfo->goal.offset;
4589                 ahd_validate_offset(ahd, tinfo, period, &offset,
4590                                     doppr ? tinfo->goal.width
4591                                           : tinfo->curr.width,
4592                                     devinfo->role);
4593                 if (doppr) {
4594                         ahd_construct_ppr(ahd, devinfo, period, offset,
4595                                           tinfo->goal.width, ppr_options);
4596                 } else {
4597                         ahd_construct_sdtr(ahd, devinfo, period, offset);
4598                 }
4599         } else {
4600                 ahd_construct_wdtr(ahd, devinfo, tinfo->goal.width);
4601         }
4602 }
4603
4604 /*
4605  * Build a synchronous negotiation message in our message
4606  * buffer based on the input parameters.
4607  */
4608 static void
4609 ahd_construct_sdtr(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
4610                    u_int period, u_int offset)
4611 {
4612         if (offset == 0)
4613                 period = AHD_ASYNC_XFER_PERIOD;
4614         ahd->msgout_index += spi_populate_sync_msg(
4615                         ahd->msgout_buf + ahd->msgout_index, period, offset);
4616         ahd->msgout_len += 5;
4617         if (bootverbose) {
4618                 printf("(%s:%c:%d:%d): Sending SDTR period %x, offset %x\n",
4619                        ahd_name(ahd), devinfo->channel, devinfo->target,
4620                        devinfo->lun, period, offset);
4621         }
4622 }
4623
4624 /*
4625  * Build a wide negotiateion message in our message
4626  * buffer based on the input parameters.
4627  */
4628 static void
4629 ahd_construct_wdtr(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
4630                    u_int bus_width)
4631 {
4632         ahd->msgout_index += spi_populate_width_msg(
4633                         ahd->msgout_buf + ahd->msgout_index, bus_width);
4634         ahd->msgout_len += 4;
4635         if (bootverbose) {
4636                 printf("(%s:%c:%d:%d): Sending WDTR %x\n",
4637                        ahd_name(ahd), devinfo->channel, devinfo->target,
4638                        devinfo->lun, bus_width);
4639         }
4640 }
4641
4642 /*
4643  * Build a parallel protocol request message in our message
4644  * buffer based on the input parameters.
4645  */
4646 static void
4647 ahd_construct_ppr(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
4648                   u_int period, u_int offset, u_int bus_width,
4649                   u_int ppr_options)
4650 {
4651         /*
4652          * Always request precompensation from
4653          * the other target if we are running
4654          * at paced syncrates.
4655          */
4656         if (period <= AHD_SYNCRATE_PACED)
4657                 ppr_options |= MSG_EXT_PPR_PCOMP_EN;
4658         if (offset == 0)
4659                 period = AHD_ASYNC_XFER_PERIOD;
4660         ahd->msgout_index += spi_populate_ppr_msg(
4661                         ahd->msgout_buf + ahd->msgout_index, period, offset,
4662                         bus_width, ppr_options);
4663         ahd->msgout_len += 8;
4664         if (bootverbose) {
4665                 printf("(%s:%c:%d:%d): Sending PPR bus_width %x, period %x, "
4666                        "offset %x, ppr_options %x\n", ahd_name(ahd),
4667                        devinfo->channel, devinfo->target, devinfo->lun,
4668                        bus_width, period, offset, ppr_options);
4669         }
4670 }
4671
4672 /*
4673  * Clear any active message state.
4674  */
4675 static void
4676 ahd_clear_msg_state(struct ahd_softc *ahd)
4677 {
4678         ahd_mode_state saved_modes;
4679
4680         saved_modes = ahd_save_modes(ahd);
4681         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
4682         ahd->send_msg_perror = 0;
4683         ahd->msg_flags = MSG_FLAG_NONE;
4684         ahd->msgout_len = 0;
4685         ahd->msgin_index = 0;
4686         ahd->msg_type = MSG_TYPE_NONE;
4687         if ((ahd_inb(ahd, SCSISIGO) & ATNO) != 0) {
4688                 /*
4689                  * The target didn't care to respond to our
4690                  * message request, so clear ATN.
4691                  */
4692                 ahd_outb(ahd, CLRSINT1, CLRATNO);
4693         }
4694         ahd_outb(ahd, MSG_OUT, MSG_NOOP);
4695         ahd_outb(ahd, SEQ_FLAGS2,
4696                  ahd_inb(ahd, SEQ_FLAGS2) & ~TARGET_MSG_PENDING);
4697         ahd_restore_modes(ahd, saved_modes);
4698 }
4699
4700 /*
4701  * Manual message loop handler.
4702  */
4703 static void
4704 ahd_handle_message_phase(struct ahd_softc *ahd)
4705 {
4706         struct  ahd_devinfo devinfo;
4707         u_int   bus_phase;
4708         int     end_session;
4709
4710         ahd_fetch_devinfo(ahd, &devinfo);
4711         end_session = FALSE;
4712         bus_phase = ahd_inb(ahd, LASTPHASE);
4713
4714         if ((ahd_inb(ahd, LQISTAT2) & LQIPHASE_OUTPKT) != 0) {
4715                 printf("LQIRETRY for LQIPHASE_OUTPKT\n");
4716                 ahd_outb(ahd, LQCTL2, LQIRETRY);
4717         }
4718 reswitch:
4719         switch (ahd->msg_type) {
4720         case MSG_TYPE_INITIATOR_MSGOUT:
4721         {
4722                 int lastbyte;
4723                 int phasemis;
4724                 int msgdone;
4725
4726                 if (ahd->msgout_len == 0 && ahd->send_msg_perror == 0)
4727                         panic("HOST_MSG_LOOP interrupt with no active message");
4728
4729 #ifdef AHD_DEBUG
4730                 if ((ahd_debug & AHD_SHOW_MESSAGES) != 0) {
4731                         ahd_print_devinfo(ahd, &devinfo);
4732                         printf("INITIATOR_MSG_OUT");
4733                 }
4734 #endif
4735                 phasemis = bus_phase != P_MESGOUT;
4736                 if (phasemis) {
4737 #ifdef AHD_DEBUG
4738                         if ((ahd_debug & AHD_SHOW_MESSAGES) != 0) {
4739                                 printf(" PHASEMIS %s\n",
4740                                        ahd_lookup_phase_entry(bus_phase)
4741                                                              ->phasemsg);
4742                         }
4743 #endif
4744                         if (bus_phase == P_MESGIN) {
4745                                 /*
4746                                  * Change gears and see if
4747                                  * this messages is of interest to
4748                                  * us or should be passed back to
4749                                  * the sequencer.
4750                                  */
4751                                 ahd_outb(ahd, CLRSINT1, CLRATNO);
4752                                 ahd->send_msg_perror = 0;
4753                                 ahd->msg_type = MSG_TYPE_INITIATOR_MSGIN;
4754                                 ahd->msgin_index = 0;
4755                                 goto reswitch;
4756                         }
4757                         end_session = TRUE;
4758                         break;
4759                 }
4760
4761                 if (ahd->send_msg_perror) {
4762                         ahd_outb(ahd, CLRSINT1, CLRATNO);
4763                         ahd_outb(ahd, CLRSINT1, CLRREQINIT);
4764 #ifdef AHD_DEBUG
4765                         if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
4766                                 printf(" byte 0x%x\n", ahd->send_msg_perror);
4767 #endif
4768                         /*
4769                          * If we are notifying the target of a CRC error
4770                          * during packetized operations, the target is
4771                          * within its rights to acknowledge our message
4772                          * with a busfree.
4773                          */
4774                         if ((ahd->msg_flags & MSG_FLAG_PACKETIZED) != 0
4775                          && ahd->send_msg_perror == MSG_INITIATOR_DET_ERR)
4776                                 ahd->msg_flags |= MSG_FLAG_EXPECT_IDE_BUSFREE;
4777
4778                         ahd_outb(ahd, RETURN_2, ahd->send_msg_perror);
4779                         ahd_outb(ahd, RETURN_1, CONT_MSG_LOOP_WRITE);
4780                         break;
4781                 }
4782
4783                 msgdone = ahd->msgout_index == ahd->msgout_len;
4784                 if (msgdone) {
4785                         /*
4786                          * The target has requested a retry.
4787                          * Re-assert ATN, reset our message index to
4788                          * 0, and try again.
4789                          */
4790                         ahd->msgout_index = 0;
4791                         ahd_assert_atn(ahd);
4792                 }
4793
4794                 lastbyte = ahd->msgout_index == (ahd->msgout_len - 1);
4795                 if (lastbyte) {
4796                         /* Last byte is signified by dropping ATN */
4797                         ahd_outb(ahd, CLRSINT1, CLRATNO);
4798                 }
4799
4800                 /*
4801                  * Clear our interrupt status and present
4802                  * the next byte on the bus.
4803                  */
4804                 ahd_outb(ahd, CLRSINT1, CLRREQINIT);
4805 #ifdef AHD_DEBUG
4806                 if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
4807                         printf(" byte 0x%x\n",
4808                                ahd->msgout_buf[ahd->msgout_index]);
4809 #endif
4810                 ahd_outb(ahd, RETURN_2, ahd->msgout_buf[ahd->msgout_index++]);
4811                 ahd_outb(ahd, RETURN_1, CONT_MSG_LOOP_WRITE);
4812                 break;
4813         }
4814         case MSG_TYPE_INITIATOR_MSGIN:
4815         {
4816                 int phasemis;
4817                 int message_done;
4818
4819 #ifdef AHD_DEBUG
4820                 if ((ahd_debug & AHD_SHOW_MESSAGES) != 0) {
4821                         ahd_print_devinfo(ahd, &devinfo);
4822                         printf("INITIATOR_MSG_IN");
4823                 }
4824 #endif
4825                 phasemis = bus_phase != P_MESGIN;
4826                 if (phasemis) {
4827 #ifdef AHD_DEBUG
4828                         if ((ahd_debug & AHD_SHOW_MESSAGES) != 0) {
4829                                 printf(" PHASEMIS %s\n",
4830                                        ahd_lookup_phase_entry(bus_phase)
4831                                                              ->phasemsg);
4832                         }
4833 #endif
4834                         ahd->msgin_index = 0;
4835                         if (bus_phase == P_MESGOUT
4836                          && (ahd->send_msg_perror != 0
4837                           || (ahd->msgout_len != 0
4838                            && ahd->msgout_index == 0))) {
4839                                 ahd->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
4840                                 goto reswitch;
4841                         }
4842                         end_session = TRUE;
4843                         break;
4844                 }
4845
4846                 /* Pull the byte in without acking it */
4847                 ahd->msgin_buf[ahd->msgin_index] = ahd_inb(ahd, SCSIBUS);
4848 #ifdef AHD_DEBUG
4849                 if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
4850                         printf(" byte 0x%x\n",
4851                                ahd->msgin_buf[ahd->msgin_index]);
4852 #endif
4853
4854                 message_done = ahd_parse_msg(ahd, &devinfo);
4855
4856                 if (message_done) {
4857                         /*
4858                          * Clear our incoming message buffer in case there
4859                          * is another message following this one.
4860                          */
4861                         ahd->msgin_index = 0;
4862
4863                         /*
4864                          * If this message illicited a response,
4865                          * assert ATN so the target takes us to the
4866                          * message out phase.
4867                          */
4868                         if (ahd->msgout_len != 0) {
4869 #ifdef AHD_DEBUG
4870                                 if ((ahd_debug & AHD_SHOW_MESSAGES) != 0) {
4871                                         ahd_print_devinfo(ahd, &devinfo);
4872                                         printf("Asserting ATN for response\n");
4873                                 }
4874 #endif
4875                                 ahd_assert_atn(ahd);
4876                         }
4877                 } else
4878                         ahd->msgin_index++;
4879
4880                 if (message_done == MSGLOOP_TERMINATED) {
4881                         end_session = TRUE;
4882                 } else {
4883                         /* Ack the byte */
4884                         ahd_outb(ahd, CLRSINT1, CLRREQINIT);
4885                         ahd_outb(ahd, RETURN_1, CONT_MSG_LOOP_READ);
4886                 }
4887                 break;
4888         }
4889         case MSG_TYPE_TARGET_MSGIN:
4890         {
4891                 int msgdone;
4892                 int msgout_request;
4893
4894                 /*
4895                  * By default, the message loop will continue.
4896                  */
4897                 ahd_outb(ahd, RETURN_1, CONT_MSG_LOOP_TARG);
4898
4899                 if (ahd->msgout_len == 0)
4900                         panic("Target MSGIN with no active message");
4901
4902                 /*
4903                  * If we interrupted a mesgout session, the initiator
4904                  * will not know this until our first REQ.  So, we
4905                  * only honor mesgout requests after we've sent our
4906                  * first byte.
4907                  */
4908                 if ((ahd_inb(ahd, SCSISIGI) & ATNI) != 0
4909                  && ahd->msgout_index > 0)
4910                         msgout_request = TRUE;
4911                 else
4912                         msgout_request = FALSE;
4913
4914                 if (msgout_request) {
4915
4916                         /*
4917                          * Change gears and see if
4918                          * this messages is of interest to
4919                          * us or should be passed back to
4920                          * the sequencer.
4921                          */
4922                         ahd->msg_type = MSG_TYPE_TARGET_MSGOUT;
4923                         ahd_outb(ahd, SCSISIGO, P_MESGOUT | BSYO);
4924                         ahd->msgin_index = 0;
4925                         /* Dummy read to REQ for first byte */
4926                         ahd_inb(ahd, SCSIDAT);
4927                         ahd_outb(ahd, SXFRCTL0,
4928                                  ahd_inb(ahd, SXFRCTL0) | SPIOEN);
4929                         break;
4930                 }
4931
4932                 msgdone = ahd->msgout_index == ahd->msgout_len;
4933                 if (msgdone) {
4934                         ahd_outb(ahd, SXFRCTL0,
4935                                  ahd_inb(ahd, SXFRCTL0) & ~SPIOEN);
4936                         end_session = TRUE;
4937                         break;
4938                 }
4939
4940                 /*
4941                  * Present the next byte on the bus.
4942                  */
4943                 ahd_outb(ahd, SXFRCTL0, ahd_inb(ahd, SXFRCTL0) | SPIOEN);
4944                 ahd_outb(ahd, SCSIDAT, ahd->msgout_buf[ahd->msgout_index++]);
4945                 break;
4946         }
4947         case MSG_TYPE_TARGET_MSGOUT:
4948         {
4949                 int lastbyte;
4950                 int msgdone;
4951
4952                 /*
4953                  * By default, the message loop will continue.
4954                  */
4955                 ahd_outb(ahd, RETURN_1, CONT_MSG_LOOP_TARG);
4956
4957                 /*
4958                  * The initiator signals that this is
4959                  * the last byte by dropping ATN.
4960                  */
4961                 lastbyte = (ahd_inb(ahd, SCSISIGI) & ATNI) == 0;
4962
4963                 /*
4964                  * Read the latched byte, but turn off SPIOEN first
4965                  * so that we don't inadvertently cause a REQ for the
4966                  * next byte.
4967                  */
4968                 ahd_outb(ahd, SXFRCTL0, ahd_inb(ahd, SXFRCTL0) & ~SPIOEN);
4969                 ahd->msgin_buf[ahd->msgin_index] = ahd_inb(ahd, SCSIDAT);
4970                 msgdone = ahd_parse_msg(ahd, &devinfo);
4971                 if (msgdone == MSGLOOP_TERMINATED) {
4972                         /*
4973                          * The message is *really* done in that it caused
4974                          * us to go to bus free.  The sequencer has already
4975                          * been reset at this point, so pull the ejection
4976                          * handle.
4977                          */
4978                         return;
4979                 }
4980
4981                 ahd->msgin_index++;
4982
4983                 /*
4984                  * XXX Read spec about initiator dropping ATN too soon
4985                  *     and use msgdone to detect it.
4986                  */
4987                 if (msgdone == MSGLOOP_MSGCOMPLETE) {
4988                         ahd->msgin_index = 0;
4989
4990                         /*
4991                          * If this message illicited a response, transition
4992                          * to the Message in phase and send it.
4993                          */
4994                         if (ahd->msgout_len != 0) {
4995                                 ahd_outb(ahd, SCSISIGO, P_MESGIN | BSYO);
4996                                 ahd_outb(ahd, SXFRCTL0,
4997                                          ahd_inb(ahd, SXFRCTL0) | SPIOEN);
4998                                 ahd->msg_type = MSG_TYPE_TARGET_MSGIN;
4999                                 ahd->msgin_index = 0;
5000                                 break;
5001                         }
5002                 }
5003
5004                 if (lastbyte)
5005                         end_session = TRUE;
5006                 else {
5007                         /* Ask for the next byte. */
5008                         ahd_outb(ahd, SXFRCTL0,
5009                                  ahd_inb(ahd, SXFRCTL0) | SPIOEN);
5010                 }
5011
5012                 break;
5013         }
5014         default:
5015                 panic("Unknown REQINIT message type");
5016         }
5017
5018         if (end_session) {
5019                 if ((ahd->msg_flags & MSG_FLAG_PACKETIZED) != 0) {
5020                         printf("%s: Returning to Idle Loop\n",
5021                                ahd_name(ahd));
5022                         ahd_clear_msg_state(ahd);
5023
5024                         /*
5025                          * Perform the equivalent of a clear_target_state.
5026                          */
5027                         ahd_outb(ahd, LASTPHASE, P_BUSFREE);
5028                         ahd_outb(ahd, SEQ_FLAGS, NOT_IDENTIFIED|NO_CDB_SENT);
5029                         ahd_outb(ahd, SEQCTL0, FASTMODE|SEQRESET);
5030                 } else {
5031                         ahd_clear_msg_state(ahd);
5032                         ahd_outb(ahd, RETURN_1, EXIT_MSG_LOOP);
5033                 }
5034         }
5035 }
5036
5037 /*
5038  * See if we sent a particular extended message to the target.
5039  * If "full" is true, return true only if the target saw the full
5040  * message.  If "full" is false, return true if the target saw at
5041  * least the first byte of the message.
5042  */
5043 static int
5044 ahd_sent_msg(struct ahd_softc *ahd, ahd_msgtype type, u_int msgval, int full)
5045 {
5046         int found;
5047         u_int index;
5048
5049         found = FALSE;
5050         index = 0;
5051
5052         while (index < ahd->msgout_len) {
5053                 if (ahd->msgout_buf[index] == MSG_EXTENDED) {
5054                         u_int end_index;
5055
5056                         end_index = index + 1 + ahd->msgout_buf[index + 1];
5057                         if (ahd->msgout_buf[index+2] == msgval
5058                          && type == AHDMSG_EXT) {
5059
5060                                 if (full) {
5061                                         if (ahd->msgout_index > end_index)
5062                                                 found = TRUE;
5063                                 } else if (ahd->msgout_index > index)
5064                                         found = TRUE;
5065                         }
5066                         index = end_index;
5067                 } else if (ahd->msgout_buf[index] >= MSG_SIMPLE_TASK
5068                         && ahd->msgout_buf[index] <= MSG_IGN_WIDE_RESIDUE) {
5069
5070                         /* Skip tag type and tag id or residue param*/
5071                         index += 2;
5072                 } else {
5073                         /* Single byte message */
5074                         if (type == AHDMSG_1B
5075                          && ahd->msgout_index > index
5076                          && (ahd->msgout_buf[index] == msgval
5077                           || ((ahd->msgout_buf[index] & MSG_IDENTIFYFLAG) != 0
5078                            && msgval == MSG_IDENTIFYFLAG)))
5079                                 found = TRUE;
5080                         index++;
5081                 }
5082
5083                 if (found)
5084                         break;
5085         }
5086         return (found);
5087 }
5088
5089 /*
5090  * Wait for a complete incoming message, parse it, and respond accordingly.
5091  */
5092 static int
5093 ahd_parse_msg(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
5094 {
5095         struct  ahd_initiator_tinfo *tinfo;
5096         struct  ahd_tmode_tstate *tstate;
5097         int     reject;
5098         int     done;
5099         int     response;
5100
5101         done = MSGLOOP_IN_PROG;
5102         response = FALSE;
5103         reject = FALSE;
5104         tinfo = ahd_fetch_transinfo(ahd, devinfo->channel, devinfo->our_scsiid,
5105                                     devinfo->target, &tstate);
5106
5107         /*
5108          * Parse as much of the message as is available,
5109          * rejecting it if we don't support it.  When
5110          * the entire message is available and has been
5111          * handled, return MSGLOOP_MSGCOMPLETE, indicating
5112          * that we have parsed an entire message.
5113          *
5114          * In the case of extended messages, we accept the length
5115          * byte outright and perform more checking once we know the
5116          * extended message type.
5117          */
5118         switch (ahd->msgin_buf[0]) {
5119         case MSG_DISCONNECT:
5120         case MSG_SAVEDATAPOINTER:
5121         case MSG_CMDCOMPLETE:
5122         case MSG_RESTOREPOINTERS:
5123         case MSG_IGN_WIDE_RESIDUE:
5124                 /*
5125                  * End our message loop as these are messages
5126                  * the sequencer handles on its own.
5127                  */
5128                 done = MSGLOOP_TERMINATED;
5129                 break;
5130         case MSG_MESSAGE_REJECT:
5131                 response = ahd_handle_msg_reject(ahd, devinfo);
5132                 /* FALLTHROUGH */
5133         case MSG_NOOP:
5134                 done = MSGLOOP_MSGCOMPLETE;
5135                 break;
5136         case MSG_EXTENDED:
5137         {
5138                 /* Wait for enough of the message to begin validation */
5139                 if (ahd->msgin_index < 2)
5140                         break;
5141                 switch (ahd->msgin_buf[2]) {
5142                 case MSG_EXT_SDTR:
5143                 {
5144                         u_int    period;
5145                         u_int    ppr_options;
5146                         u_int    offset;
5147                         u_int    saved_offset;
5148
5149                         if (ahd->msgin_buf[1] != MSG_EXT_SDTR_LEN) {
5150                                 reject = TRUE;
5151                                 break;
5152                         }
5153
5154                         /*
5155                          * Wait until we have both args before validating
5156                          * and acting on this message.
5157                          *
5158                          * Add one to MSG_EXT_SDTR_LEN to account for
5159                          * the extended message preamble.
5160                          */
5161                         if (ahd->msgin_index < (MSG_EXT_SDTR_LEN + 1))
5162                                 break;
5163
5164                         period = ahd->msgin_buf[3];
5165                         ppr_options = 0;
5166                         saved_offset = offset = ahd->msgin_buf[4];
5167                         ahd_devlimited_syncrate(ahd, tinfo, &period,
5168                                                 &ppr_options, devinfo->role);
5169                         ahd_validate_offset(ahd, tinfo, period, &offset,
5170                                             tinfo->curr.width, devinfo->role);
5171                         if (bootverbose) {
5172                                 printf("(%s:%c:%d:%d): Received "
5173                                        "SDTR period %x, offset %x\n\t"
5174                                        "Filtered to period %x, offset %x\n",
5175                                        ahd_name(ahd), devinfo->channel,
5176                                        devinfo->target, devinfo->lun,
5177                                        ahd->msgin_buf[3], saved_offset,
5178                                        period, offset);
5179                         }
5180                         ahd_set_syncrate(ahd, devinfo, period,
5181                                          offset, ppr_options,
5182                                          AHD_TRANS_ACTIVE|AHD_TRANS_GOAL,
5183                                          /*paused*/TRUE);
5184
5185                         /*
5186                          * See if we initiated Sync Negotiation
5187                          * and didn't have to fall down to async
5188                          * transfers.
5189                          */
5190                         if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_SDTR, TRUE)) {
5191                                 /* We started it */
5192                                 if (saved_offset != offset) {
5193                                         /* Went too low - force async */
5194                                         reject = TRUE;
5195                                 }
5196                         } else {
5197                                 /*
5198                                  * Send our own SDTR in reply
5199                                  */
5200                                 if (bootverbose
5201                                  && devinfo->role == ROLE_INITIATOR) {
5202                                         printf("(%s:%c:%d:%d): Target "
5203                                                "Initiated SDTR\n",
5204                                                ahd_name(ahd), devinfo->channel,
5205                                                devinfo->target, devinfo->lun);
5206                                 }
5207                                 ahd->msgout_index = 0;
5208                                 ahd->msgout_len = 0;
5209                                 ahd_construct_sdtr(ahd, devinfo,
5210                                                    period, offset);
5211                                 ahd->msgout_index = 0;
5212                                 response = TRUE;
5213                         }
5214                         done = MSGLOOP_MSGCOMPLETE;
5215                         break;
5216                 }
5217                 case MSG_EXT_WDTR:
5218                 {
5219                         u_int bus_width;
5220                         u_int saved_width;
5221                         u_int sending_reply;
5222
5223                         sending_reply = FALSE;
5224                         if (ahd->msgin_buf[1] != MSG_EXT_WDTR_LEN) {
5225                                 reject = TRUE;
5226                                 break;
5227                         }
5228
5229                         /*
5230                          * Wait until we have our arg before validating
5231                          * and acting on this message.
5232                          *
5233                          * Add one to MSG_EXT_WDTR_LEN to account for
5234                          * the extended message preamble.
5235                          */
5236                         if (ahd->msgin_index < (MSG_EXT_WDTR_LEN + 1))
5237                                 break;
5238
5239                         bus_width = ahd->msgin_buf[3];
5240                         saved_width = bus_width;
5241                         ahd_validate_width(ahd, tinfo, &bus_width,
5242                                            devinfo->role);
5243                         if (bootverbose) {
5244                                 printf("(%s:%c:%d:%d): Received WDTR "
5245                                        "%x filtered to %x\n",
5246                                        ahd_name(ahd), devinfo->channel,
5247                                        devinfo->target, devinfo->lun,
5248                                        saved_width, bus_width);
5249                         }
5250
5251                         if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_WDTR, TRUE)) {
5252                                 /*
5253                                  * Don't send a WDTR back to the
5254                                  * target, since we asked first.
5255                                  * If the width went higher than our
5256                                  * request, reject it.
5257                                  */
5258                                 if (saved_width > bus_width) {
5259                                         reject = TRUE;
5260                                         printf("(%s:%c:%d:%d): requested %dBit "
5261                                                "transfers.  Rejecting...\n",
5262                                                ahd_name(ahd), devinfo->channel,
5263                                                devinfo->target, devinfo->lun,
5264                                                8 * (0x01 << bus_width));
5265                                         bus_width = 0;
5266                                 }
5267                         } else {
5268                                 /*
5269                                  * Send our own WDTR in reply
5270                                  */
5271                                 if (bootverbose
5272                                  && devinfo->role == ROLE_INITIATOR) {
5273                                         printf("(%s:%c:%d:%d): Target "
5274                                                "Initiated WDTR\n",
5275                                                ahd_name(ahd), devinfo->channel,
5276                                                devinfo->target, devinfo->lun);
5277                                 }
5278                                 ahd->msgout_index = 0;
5279                                 ahd->msgout_len = 0;
5280                                 ahd_construct_wdtr(ahd, devinfo, bus_width);
5281                                 ahd->msgout_index = 0;
5282                                 response = TRUE;
5283                                 sending_reply = TRUE;
5284                         }
5285                         /*
5286                          * After a wide message, we are async, but
5287                          * some devices don't seem to honor this portion
5288                          * of the spec.  Force a renegotiation of the
5289                          * sync component of our transfer agreement even
5290                          * if our goal is async.  By updating our width
5291                          * after forcing the negotiation, we avoid
5292                          * renegotiating for width.
5293                          */
5294                         ahd_update_neg_request(ahd, devinfo, tstate,
5295                                                tinfo, AHD_NEG_ALWAYS);
5296                         ahd_set_width(ahd, devinfo, bus_width,
5297                                       AHD_TRANS_ACTIVE|AHD_TRANS_GOAL,
5298                                       /*paused*/TRUE);
5299                         if (sending_reply == FALSE && reject == FALSE) {
5300
5301                                 /*
5302                                  * We will always have an SDTR to send.
5303                                  */
5304                                 ahd->msgout_index = 0;
5305                                 ahd->msgout_len = 0;
5306                                 ahd_build_transfer_msg(ahd, devinfo);
5307                                 ahd->msgout_index = 0;
5308                                 response = TRUE;
5309                         }
5310                         done = MSGLOOP_MSGCOMPLETE;
5311                         break;
5312                 }
5313                 case MSG_EXT_PPR:
5314                 {
5315                         u_int   period;
5316                         u_int   offset;
5317                         u_int   bus_width;
5318                         u_int   ppr_options;
5319                         u_int   saved_width;
5320                         u_int   saved_offset;
5321                         u_int   saved_ppr_options;
5322
5323                         if (ahd->msgin_buf[1] != MSG_EXT_PPR_LEN) {
5324                                 reject = TRUE;
5325                                 break;
5326                         }
5327
5328                         /*
5329                          * Wait until we have all args before validating
5330                          * and acting on this message.
5331                          *
5332                          * Add one to MSG_EXT_PPR_LEN to account for
5333                          * the extended message preamble.
5334                          */
5335                         if (ahd->msgin_index < (MSG_EXT_PPR_LEN + 1))
5336                                 break;
5337
5338                         period = ahd->msgin_buf[3];
5339                         offset = ahd->msgin_buf[5];
5340                         bus_width = ahd->msgin_buf[6];
5341                         saved_width = bus_width;
5342                         ppr_options = ahd->msgin_buf[7];
5343                         /*
5344                          * According to the spec, a DT only
5345                          * period factor with no DT option
5346                          * set implies async.
5347                          */
5348                         if ((ppr_options & MSG_EXT_PPR_DT_REQ) == 0
5349                          && period <= 9)
5350                                 offset = 0;
5351                         saved_ppr_options = ppr_options;
5352                         saved_offset = offset;
5353
5354                         /*
5355                          * Transfer options are only available if we
5356                          * are negotiating wide.
5357                          */
5358                         if (bus_width == 0)
5359                                 ppr_options &= MSG_EXT_PPR_QAS_REQ;
5360
5361                         ahd_validate_width(ahd, tinfo, &bus_width,
5362                                            devinfo->role);
5363                         ahd_devlimited_syncrate(ahd, tinfo, &period,
5364                                                 &ppr_options, devinfo->role);
5365                         ahd_validate_offset(ahd, tinfo, period, &offset,
5366                                             bus_width, devinfo->role);
5367
5368                         if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_PPR, TRUE)) {
5369                                 /*
5370                                  * If we are unable to do any of the
5371                                  * requested options (we went too low),
5372                                  * then we'll have to reject the message.
5373                                  */
5374                                 if (saved_width > bus_width
5375                                  || saved_offset != offset
5376                                  || saved_ppr_options != ppr_options) {
5377                                         reject = TRUE;
5378                                         period = 0;
5379                                         offset = 0;
5380                                         bus_width = 0;
5381                                         ppr_options = 0;
5382                                 }
5383                         } else {
5384                                 if (devinfo->role != ROLE_TARGET)
5385                                         printf("(%s:%c:%d:%d): Target "
5386                                                "Initiated PPR\n",
5387                                                ahd_name(ahd), devinfo->channel,
5388                                                devinfo->target, devinfo->lun);
5389                                 else
5390                                         printf("(%s:%c:%d:%d): Initiator "
5391                                                "Initiated PPR\n",
5392                                                ahd_name(ahd), devinfo->channel,
5393                                                devinfo->target, devinfo->lun);
5394                                 ahd->msgout_index = 0;
5395                                 ahd->msgout_len = 0;
5396                                 ahd_construct_ppr(ahd, devinfo, period, offset,
5397                                                   bus_width, ppr_options);
5398                                 ahd->msgout_index = 0;
5399                                 response = TRUE;
5400                         }
5401                         if (bootverbose) {
5402                                 printf("(%s:%c:%d:%d): Received PPR width %x, "
5403                                        "period %x, offset %x,options %x\n"
5404                                        "\tFiltered to width %x, period %x, "
5405                                        "offset %x, options %x\n",
5406                                        ahd_name(ahd), devinfo->channel,
5407                                        devinfo->target, devinfo->lun,
5408                                        saved_width, ahd->msgin_buf[3],
5409                                        saved_offset, saved_ppr_options,
5410                                        bus_width, period, offset, ppr_options);
5411                         }
5412                         ahd_set_width(ahd, devinfo, bus_width,
5413                                       AHD_TRANS_ACTIVE|AHD_TRANS_GOAL,
5414                                       /*paused*/TRUE);
5415                         ahd_set_syncrate(ahd, devinfo, period,
5416                                          offset, ppr_options,
5417                                          AHD_TRANS_ACTIVE|AHD_TRANS_GOAL,
5418                                          /*paused*/TRUE);
5419
5420                         done = MSGLOOP_MSGCOMPLETE;
5421                         break;
5422                 }
5423                 default:
5424                         /* Unknown extended message.  Reject it. */
5425                         reject = TRUE;
5426                         break;
5427                 }
5428                 break;
5429         }
5430 #ifdef AHD_TARGET_MODE
5431         case MSG_BUS_DEV_RESET:
5432                 ahd_handle_devreset(ahd, devinfo, CAM_LUN_WILDCARD,
5433                                     CAM_BDR_SENT,
5434                                     "Bus Device Reset Received",
5435                                     /*verbose_level*/0);
5436                 ahd_restart(ahd);
5437                 done = MSGLOOP_TERMINATED;
5438                 break;
5439         case MSG_ABORT_TAG:
5440         case MSG_ABORT:
5441         case MSG_CLEAR_QUEUE:
5442         {
5443                 int tag;
5444
5445                 /* Target mode messages */
5446                 if (devinfo->role != ROLE_TARGET) {
5447                         reject = TRUE;
5448                         break;
5449                 }
5450                 tag = SCB_LIST_NULL;
5451                 if (ahd->msgin_buf[0] == MSG_ABORT_TAG)
5452                         tag = ahd_inb(ahd, INITIATOR_TAG);
5453                 ahd_abort_scbs(ahd, devinfo->target, devinfo->channel,
5454                                devinfo->lun, tag, ROLE_TARGET,
5455                                CAM_REQ_ABORTED);
5456
5457                 tstate = ahd->enabled_targets[devinfo->our_scsiid];
5458                 if (tstate != NULL) {
5459                         struct ahd_tmode_lstate* lstate;
5460
5461                         lstate = tstate->enabled_luns[devinfo->lun];
5462                         if (lstate != NULL) {
5463                                 ahd_queue_lstate_event(ahd, lstate,
5464                                                        devinfo->our_scsiid,
5465                                                        ahd->msgin_buf[0],
5466                                                        /*arg*/tag);
5467                                 ahd_send_lstate_events(ahd, lstate);
5468                         }
5469                 }
5470                 ahd_restart(ahd);
5471                 done = MSGLOOP_TERMINATED;
5472                 break;
5473         }
5474 #endif
5475         case MSG_QAS_REQUEST:
5476 #ifdef AHD_DEBUG
5477                 if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
5478                         printf("%s: QAS request.  SCSISIGI == 0x%x\n",
5479                                ahd_name(ahd), ahd_inb(ahd, SCSISIGI));
5480 #endif
5481                 ahd->msg_flags |= MSG_FLAG_EXPECT_QASREJ_BUSFREE;
5482                 /* FALLTHROUGH */
5483         case MSG_TERM_IO_PROC:
5484         default:
5485                 reject = TRUE;
5486                 break;
5487         }
5488
5489         if (reject) {
5490                 /*
5491                  * Setup to reject the message.
5492                  */
5493                 ahd->msgout_index = 0;
5494                 ahd->msgout_len = 1;
5495                 ahd->msgout_buf[0] = MSG_MESSAGE_REJECT;
5496                 done = MSGLOOP_MSGCOMPLETE;
5497                 response = TRUE;
5498         }
5499
5500         if (done != MSGLOOP_IN_PROG && !response)
5501                 /* Clear the outgoing message buffer */
5502                 ahd->msgout_len = 0;
5503
5504         return (done);
5505 }
5506
5507 /*
5508  * Process a message reject message.
5509  */
5510 static int
5511 ahd_handle_msg_reject(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
5512 {
5513         /*
5514          * What we care about here is if we had an
5515          * outstanding SDTR or WDTR message for this
5516          * target.  If we did, this is a signal that
5517          * the target is refusing negotiation.
5518          */
5519         struct scb *scb;
5520         struct ahd_initiator_tinfo *tinfo;
5521         struct ahd_tmode_tstate *tstate;
5522         u_int scb_index;
5523         u_int last_msg;
5524         int   response = 0;
5525
5526         scb_index = ahd_get_scbptr(ahd);
5527         scb = ahd_lookup_scb(ahd, scb_index);
5528         tinfo = ahd_fetch_transinfo(ahd, devinfo->channel,
5529                                     devinfo->our_scsiid,
5530                                     devinfo->target, &tstate);
5531         /* Might be necessary */
5532         last_msg = ahd_inb(ahd, LAST_MSG);
5533
5534         if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_PPR, /*full*/FALSE)) {
5535                 if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_PPR, /*full*/TRUE)
5536                  && tinfo->goal.period <= AHD_SYNCRATE_PACED) {
5537                         /*
5538                          * Target may not like our SPI-4 PPR Options.
5539                          * Attempt to negotiate 80MHz which will turn
5540                          * off these options.
5541                          */
5542                         if (bootverbose) {
5543                                 printf("(%s:%c:%d:%d): PPR Rejected. "
5544                                        "Trying simple U160 PPR\n",
5545                                        ahd_name(ahd), devinfo->channel,
5546                                        devinfo->target, devinfo->lun);
5547                         }
5548                         tinfo->goal.period = AHD_SYNCRATE_DT;
5549                         tinfo->goal.ppr_options &= MSG_EXT_PPR_IU_REQ
5550                                                 |  MSG_EXT_PPR_QAS_REQ
5551                                                 |  MSG_EXT_PPR_DT_REQ;
5552                 } else {
5553                         /*
5554                          * Target does not support the PPR message.
5555                          * Attempt to negotiate SPI-2 style.
5556                          */
5557                         if (bootverbose) {
5558                                 printf("(%s:%c:%d:%d): PPR Rejected. "
5559                                        "Trying WDTR/SDTR\n",
5560                                        ahd_name(ahd), devinfo->channel,
5561                                        devinfo->target, devinfo->lun);
5562                         }
5563                         tinfo->goal.ppr_options = 0;
5564                         tinfo->curr.transport_version = 2;
5565                         tinfo->goal.transport_version = 2;
5566                 }
5567                 ahd->msgout_index = 0;
5568                 ahd->msgout_len = 0;
5569                 ahd_build_transfer_msg(ahd, devinfo);
5570                 ahd->msgout_index = 0;
5571                 response = 1;
5572         } else if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_WDTR, /*full*/FALSE)) {
5573
5574                 /* note 8bit xfers */
5575                 printf("(%s:%c:%d:%d): refuses WIDE negotiation.  Using "
5576                        "8bit transfers\n", ahd_name(ahd),
5577                        devinfo->channel, devinfo->target, devinfo->lun);
5578                 ahd_set_width(ahd, devinfo, MSG_EXT_WDTR_BUS_8_BIT,
5579                               AHD_TRANS_ACTIVE|AHD_TRANS_GOAL,
5580                               /*paused*/TRUE);
5581                 /*
5582                  * No need to clear the sync rate.  If the target
5583                  * did not accept the command, our syncrate is
5584                  * unaffected.  If the target started the negotiation,
5585                  * but rejected our response, we already cleared the
5586                  * sync rate before sending our WDTR.
5587                  */
5588                 if (tinfo->goal.offset != tinfo->curr.offset) {
5589
5590                         /* Start the sync negotiation */
5591                         ahd->msgout_index = 0;
5592                         ahd->msgout_len = 0;
5593                         ahd_build_transfer_msg(ahd, devinfo);
5594                         ahd->msgout_index = 0;
5595                         response = 1;
5596                 }
5597         } else if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_SDTR, /*full*/FALSE)) {
5598                 /* note asynch xfers and clear flag */
5599                 ahd_set_syncrate(ahd, devinfo, /*period*/0,
5600                                  /*offset*/0, /*ppr_options*/0,
5601                                  AHD_TRANS_ACTIVE|AHD_TRANS_GOAL,
5602                                  /*paused*/TRUE);
5603                 printf("(%s:%c:%d:%d): refuses synchronous negotiation. "
5604                        "Using asynchronous transfers\n",
5605                        ahd_name(ahd), devinfo->channel,
5606                        devinfo->target, devinfo->lun);
5607         } else if ((scb->hscb->control & MSG_SIMPLE_TASK) != 0) {
5608                 int tag_type;
5609                 int mask;
5610
5611                 tag_type = (scb->hscb->control & MSG_SIMPLE_TASK);
5612
5613                 if (tag_type == MSG_SIMPLE_TASK) {
5614                         printf("(%s:%c:%d:%d): refuses tagged commands.  "
5615                                "Performing non-tagged I/O\n", ahd_name(ahd),
5616                                devinfo->channel, devinfo->target, devinfo->lun);
5617                         ahd_set_tags(ahd, scb->io_ctx, devinfo, AHD_QUEUE_NONE);
5618                         mask = ~0x23;
5619                 } else {
5620                         printf("(%s:%c:%d:%d): refuses %s tagged commands.  "
5621                                "Performing simple queue tagged I/O only\n",
5622                                ahd_name(ahd), devinfo->channel, devinfo->target,
5623                                devinfo->lun, tag_type == MSG_ORDERED_TASK
5624                                ? "ordered" : "head of queue");
5625                         ahd_set_tags(ahd, scb->io_ctx, devinfo, AHD_QUEUE_BASIC);
5626                         mask = ~0x03;
5627                 }
5628
5629                 /*
5630                  * Resend the identify for this CCB as the target
5631                  * may believe that the selection is invalid otherwise.
5632                  */
5633                 ahd_outb(ahd, SCB_CONTROL,
5634                          ahd_inb_scbram(ahd, SCB_CONTROL) & mask);
5635                 scb->hscb->control &= mask;
5636                 ahd_set_transaction_tag(scb, /*enabled*/FALSE,
5637                                         /*type*/MSG_SIMPLE_TASK);
5638                 ahd_outb(ahd, MSG_OUT, MSG_IDENTIFYFLAG);
5639                 ahd_assert_atn(ahd);
5640                 ahd_busy_tcl(ahd, BUILD_TCL(scb->hscb->scsiid, devinfo->lun),
5641                              SCB_GET_TAG(scb));
5642
5643                 /*
5644                  * Requeue all tagged commands for this target
5645                  * currently in our posession so they can be
5646                  * converted to untagged commands.
5647                  */
5648                 ahd_search_qinfifo(ahd, SCB_GET_TARGET(ahd, scb),
5649                                    SCB_GET_CHANNEL(ahd, scb),
5650                                    SCB_GET_LUN(scb), /*tag*/SCB_LIST_NULL,
5651                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
5652                                    SEARCH_COMPLETE);
5653         } else if (ahd_sent_msg(ahd, AHDMSG_1B, MSG_IDENTIFYFLAG, TRUE)) {
5654                 /*
5655                  * Most likely the device believes that we had
5656                  * previously negotiated packetized.
5657                  */
5658                 ahd->msg_flags |= MSG_FLAG_EXPECT_PPR_BUSFREE
5659                                |  MSG_FLAG_IU_REQ_CHANGED;
5660
5661                 ahd_force_renegotiation(ahd, devinfo);
5662                 ahd->msgout_index = 0;
5663                 ahd->msgout_len = 0;
5664                 ahd_build_transfer_msg(ahd, devinfo);
5665                 ahd->msgout_index = 0;
5666                 response = 1;
5667         } else {
5668                 /*
5669                  * Otherwise, we ignore it.
5670                  */
5671                 printf("%s:%c:%d: Message reject for %x -- ignored\n",
5672                        ahd_name(ahd), devinfo->channel, devinfo->target,
5673                        last_msg);
5674         }
5675         return (response);
5676 }
5677
5678 /*
5679  * Process an ingnore wide residue message.
5680  */
5681 static void
5682 ahd_handle_ign_wide_residue(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
5683 {
5684         u_int scb_index;
5685         struct scb *scb;
5686
5687         scb_index = ahd_get_scbptr(ahd);
5688         scb = ahd_lookup_scb(ahd, scb_index);
5689         /*
5690          * XXX Actually check data direction in the sequencer?
5691          * Perhaps add datadir to some spare bits in the hscb?
5692          */
5693         if ((ahd_inb(ahd, SEQ_FLAGS) & DPHASE) == 0
5694          || ahd_get_transfer_dir(scb) != CAM_DIR_IN) {
5695                 /*
5696                  * Ignore the message if we haven't
5697                  * seen an appropriate data phase yet.
5698                  */
5699         } else {
5700                 /*
5701                  * If the residual occurred on the last
5702                  * transfer and the transfer request was
5703                  * expected to end on an odd count, do
5704                  * nothing.  Otherwise, subtract a byte
5705                  * and update the residual count accordingly.
5706                  */
5707                 uint32_t sgptr;
5708
5709                 sgptr = ahd_inb_scbram(ahd, SCB_RESIDUAL_SGPTR);
5710                 if ((sgptr & SG_LIST_NULL) != 0
5711                  && (ahd_inb_scbram(ahd, SCB_TASK_ATTRIBUTE)
5712                      & SCB_XFERLEN_ODD) != 0) {
5713                         /*
5714                          * If the residual occurred on the last
5715                          * transfer and the transfer request was
5716                          * expected to end on an odd count, do
5717                          * nothing.
5718                          */
5719                 } else {
5720                         uint32_t data_cnt;
5721                         uint64_t data_addr;
5722                         uint32_t sglen;
5723
5724                         /* Pull in the rest of the sgptr */
5725                         sgptr = ahd_inl_scbram(ahd, SCB_RESIDUAL_SGPTR);
5726                         data_cnt = ahd_inl_scbram(ahd, SCB_RESIDUAL_DATACNT);
5727                         if ((sgptr & SG_LIST_NULL) != 0) {
5728                                 /*
5729                                  * The residual data count is not updated
5730                                  * for the command run to completion case.
5731                                  * Explicitly zero the count.
5732                                  */
5733                                 data_cnt &= ~AHD_SG_LEN_MASK;
5734                         }
5735                         data_addr = ahd_inq(ahd, SHADDR);
5736                         data_cnt += 1;
5737                         data_addr -= 1;
5738                         sgptr &= SG_PTR_MASK;
5739                         if ((ahd->flags & AHD_64BIT_ADDRESSING) != 0) {
5740                                 struct ahd_dma64_seg *sg;
5741
5742                                 sg = ahd_sg_bus_to_virt(ahd, scb, sgptr);
5743
5744                                 /*
5745                                  * The residual sg ptr points to the next S/G
5746                                  * to load so we must go back one.
5747                                  */
5748                                 sg--;
5749                                 sglen = ahd_le32toh(sg->len) & AHD_SG_LEN_MASK;
5750                                 if (sg != scb->sg_list
5751                                  && sglen < (data_cnt & AHD_SG_LEN_MASK)) {
5752
5753                                         sg--;
5754                                         sglen = ahd_le32toh(sg->len);
5755                                         /*
5756                                          * Preserve High Address and SG_LIST
5757                                          * bits while setting the count to 1.
5758                                          */
5759                                         data_cnt = 1|(sglen&(~AHD_SG_LEN_MASK));
5760                                         data_addr = ahd_le64toh(sg->addr)
5761                                                   + (sglen & AHD_SG_LEN_MASK)
5762                                                   - 1;
5763
5764                                         /*
5765                                          * Increment sg so it points to the
5766                                          * "next" sg.
5767                                          */
5768                                         sg++;
5769                                         sgptr = ahd_sg_virt_to_bus(ahd, scb,
5770                                                                    sg);
5771                                 }
5772                         } else {
5773                                 struct ahd_dma_seg *sg;
5774
5775                                 sg = ahd_sg_bus_to_virt(ahd, scb, sgptr);
5776
5777                                 /*
5778                                  * The residual sg ptr points to the next S/G
5779                                  * to load so we must go back one.
5780                                  */
5781                                 sg--;
5782                                 sglen = ahd_le32toh(sg->len) & AHD_SG_LEN_MASK;
5783                                 if (sg != scb->sg_list
5784                                  && sglen < (data_cnt & AHD_SG_LEN_MASK)) {
5785
5786                                         sg--;
5787                                         sglen = ahd_le32toh(sg->len);
5788                                         /*
5789                                          * Preserve High Address and SG_LIST
5790                                          * bits while setting the count to 1.
5791                                          */
5792                                         data_cnt = 1|(sglen&(~AHD_SG_LEN_MASK));
5793                                         data_addr = ahd_le32toh(sg->addr)
5794                                                   + (sglen & AHD_SG_LEN_MASK)
5795                                                   - 1;
5796
5797                                         /*
5798                                          * Increment sg so it points to the
5799                                          * "next" sg.
5800                                          */
5801                                         sg++;
5802                                         sgptr = ahd_sg_virt_to_bus(ahd, scb,
5803                                                                   sg);
5804                                 }
5805                         }
5806                         /*
5807                          * Toggle the "oddness" of the transfer length
5808                          * to handle this mid-transfer ignore wide
5809                          * residue.  This ensures that the oddness is
5810                          * correct for subsequent data transfers.
5811                          */
5812                         ahd_outb(ahd, SCB_TASK_ATTRIBUTE,
5813                             ahd_inb_scbram(ahd, SCB_TASK_ATTRIBUTE)
5814                             ^ SCB_XFERLEN_ODD);
5815
5816                         ahd_outl(ahd, SCB_RESIDUAL_SGPTR, sgptr);
5817                         ahd_outl(ahd, SCB_RESIDUAL_DATACNT, data_cnt);
5818                         /*
5819                          * The FIFO's pointers will be updated if/when the
5820                          * sequencer re-enters a data phase.
5821                          */
5822                 }
5823         }
5824 }
5825
5826
5827 /*
5828  * Reinitialize the data pointers for the active transfer
5829  * based on its current residual.
5830  */
5831 static void
5832 ahd_reinitialize_dataptrs(struct ahd_softc *ahd)
5833 {
5834         struct           scb *scb;
5835         ahd_mode_state   saved_modes;
5836         u_int            scb_index;
5837         u_int            wait;
5838         uint32_t         sgptr;
5839         uint32_t         resid;
5840         uint64_t         dataptr;
5841
5842         AHD_ASSERT_MODES(ahd, AHD_MODE_DFF0_MSK|AHD_MODE_DFF1_MSK,
5843                          AHD_MODE_DFF0_MSK|AHD_MODE_DFF1_MSK);
5844
5845         scb_index = ahd_get_scbptr(ahd);
5846         scb = ahd_lookup_scb(ahd, scb_index);
5847
5848         /*
5849          * Release and reacquire the FIFO so we
5850          * have a clean slate.
5851          */
5852         ahd_outb(ahd, DFFSXFRCTL, CLRCHN);
5853         wait = 1000;
5854         while (--wait && !(ahd_inb(ahd, MDFFSTAT) & FIFOFREE))
5855                 ahd_delay(100);
5856         if (wait == 0) {
5857                 ahd_print_path(ahd, scb);
5858                 printf("ahd_reinitialize_dataptrs: Forcing FIFO free.\n");
5859                 ahd_outb(ahd, DFFSXFRCTL, RSTCHN|CLRSHCNT);
5860         }
5861         saved_modes = ahd_save_modes(ahd);
5862         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
5863         ahd_outb(ahd, DFFSTAT,
5864                  ahd_inb(ahd, DFFSTAT)
5865                 | (saved_modes == 0x11 ? CURRFIFO_1 : CURRFIFO_0));
5866
5867         /*
5868          * Determine initial values for data_addr and data_cnt
5869          * for resuming the data phase.
5870          */
5871         sgptr = ahd_inl_scbram(ahd, SCB_RESIDUAL_SGPTR);
5872         sgptr &= SG_PTR_MASK;
5873
5874         resid = (ahd_inb_scbram(ahd, SCB_RESIDUAL_DATACNT + 2) << 16)
5875               | (ahd_inb_scbram(ahd, SCB_RESIDUAL_DATACNT + 1) << 8)
5876               | ahd_inb_scbram(ahd, SCB_RESIDUAL_DATACNT);
5877
5878         if ((ahd->flags & AHD_64BIT_ADDRESSING) != 0) {
5879                 struct ahd_dma64_seg *sg;
5880
5881                 sg = ahd_sg_bus_to_virt(ahd, scb, sgptr);
5882
5883                 /* The residual sg_ptr always points to the next sg */
5884                 sg--;
5885
5886                 dataptr = ahd_le64toh(sg->addr)
5887                         + (ahd_le32toh(sg->len) & AHD_SG_LEN_MASK)
5888                         - resid;
5889                 ahd_outl(ahd, HADDR + 4, dataptr >> 32);
5890         } else {
5891                 struct   ahd_dma_seg *sg;
5892
5893                 sg = ahd_sg_bus_to_virt(ahd, scb, sgptr);
5894
5895                 /* The residual sg_ptr always points to the next sg */
5896                 sg--;
5897
5898                 dataptr = ahd_le32toh(sg->addr)
5899                         + (ahd_le32toh(sg->len) & AHD_SG_LEN_MASK)
5900                         - resid;
5901                 ahd_outb(ahd, HADDR + 4,
5902                          (ahd_le32toh(sg->len) & ~AHD_SG_LEN_MASK) >> 24);
5903         }
5904         ahd_outl(ahd, HADDR, dataptr);
5905         ahd_outb(ahd, HCNT + 2, resid >> 16);
5906         ahd_outb(ahd, HCNT + 1, resid >> 8);
5907         ahd_outb(ahd, HCNT, resid);
5908 }
5909
5910 /*
5911  * Handle the effects of issuing a bus device reset message.
5912  */
5913 static void
5914 ahd_handle_devreset(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
5915                     u_int lun, cam_status status, char *message,
5916                     int verbose_level)
5917 {
5918 #ifdef AHD_TARGET_MODE
5919         struct ahd_tmode_tstate* tstate;
5920 #endif
5921         int found;
5922
5923         found = ahd_abort_scbs(ahd, devinfo->target, devinfo->channel,
5924                                lun, SCB_LIST_NULL, devinfo->role,
5925                                status);
5926
5927 #ifdef AHD_TARGET_MODE
5928         /*
5929          * Send an immediate notify ccb to all target mord peripheral
5930          * drivers affected by this action.
5931          */
5932         tstate = ahd->enabled_targets[devinfo->our_scsiid];
5933         if (tstate != NULL) {
5934                 u_int cur_lun;
5935                 u_int max_lun;
5936
5937                 if (lun != CAM_LUN_WILDCARD) {
5938                         cur_lun = 0;
5939                         max_lun = AHD_NUM_LUNS - 1;
5940                 } else {
5941                         cur_lun = lun;
5942                         max_lun = lun;
5943                 }
5944                 for (;cur_lun <= max_lun; cur_lun++) {
5945                         struct ahd_tmode_lstate* lstate;
5946
5947                         lstate = tstate->enabled_luns[cur_lun];
5948                         if (lstate == NULL)
5949                                 continue;
5950
5951                         ahd_queue_lstate_event(ahd, lstate, devinfo->our_scsiid,
5952                                                MSG_BUS_DEV_RESET, /*arg*/0);
5953                         ahd_send_lstate_events(ahd, lstate);
5954                 }
5955         }
5956 #endif
5957
5958         /*
5959          * Go back to async/narrow transfers and renegotiate.
5960          */
5961         ahd_set_width(ahd, devinfo, MSG_EXT_WDTR_BUS_8_BIT,
5962                       AHD_TRANS_CUR, /*paused*/TRUE);
5963         ahd_set_syncrate(ahd, devinfo, /*period*/0, /*offset*/0,
5964                          /*ppr_options*/0, AHD_TRANS_CUR,
5965                          /*paused*/TRUE);
5966
5967         if (status != CAM_SEL_TIMEOUT)
5968                 ahd_send_async(ahd, devinfo->channel, devinfo->target,
5969                                CAM_LUN_WILDCARD, AC_SENT_BDR);
5970
5971         if (message != NULL && bootverbose)
5972                 printf("%s: %s on %c:%d. %d SCBs aborted\n", ahd_name(ahd),
5973                        message, devinfo->channel, devinfo->target, found);
5974 }
5975
5976 #ifdef AHD_TARGET_MODE
5977 static void
5978 ahd_setup_target_msgin(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
5979                        struct scb *scb)
5980 {
5981
5982         /*
5983          * To facilitate adding multiple messages together,
5984          * each routine should increment the index and len
5985          * variables instead of setting them explicitly.
5986          */
5987         ahd->msgout_index = 0;
5988         ahd->msgout_len = 0;
5989
5990         if (scb != NULL && (scb->flags & SCB_AUTO_NEGOTIATE) != 0)
5991                 ahd_build_transfer_msg(ahd, devinfo);
5992         else
5993                 panic("ahd_intr: AWAITING target message with no message");
5994
5995         ahd->msgout_index = 0;
5996         ahd->msg_type = MSG_TYPE_TARGET_MSGIN;
5997 }
5998 #endif
5999 /**************************** Initialization **********************************/
6000 static u_int
6001 ahd_sglist_size(struct ahd_softc *ahd)
6002 {
6003         bus_size_t list_size;
6004
6005         list_size = sizeof(struct ahd_dma_seg) * AHD_NSEG;
6006         if ((ahd->flags & AHD_64BIT_ADDRESSING) != 0)
6007                 list_size = sizeof(struct ahd_dma64_seg) * AHD_NSEG;
6008         return (list_size);
6009 }
6010
6011 /*
6012  * Calculate the optimum S/G List allocation size.  S/G elements used
6013  * for a given transaction must be physically contiguous.  Assume the
6014  * OS will allocate full pages to us, so it doesn't make sense to request
6015  * less than a page.
6016  */
6017 static u_int
6018 ahd_sglist_allocsize(struct ahd_softc *ahd)
6019 {
6020         bus_size_t sg_list_increment;
6021         bus_size_t sg_list_size;
6022         bus_size_t max_list_size;
6023         bus_size_t best_list_size;
6024
6025         /* Start out with the minimum required for AHD_NSEG. */
6026         sg_list_increment = ahd_sglist_size(ahd);
6027         sg_list_size = sg_list_increment;
6028
6029         /* Get us as close as possible to a page in size. */
6030         while ((sg_list_size + sg_list_increment) <= PAGE_SIZE)
6031                 sg_list_size += sg_list_increment;
6032
6033         /*
6034          * Try to reduce the amount of wastage by allocating
6035          * multiple pages.
6036          */
6037         best_list_size = sg_list_size;
6038         max_list_size = roundup(sg_list_increment, PAGE_SIZE);
6039         if (max_list_size < 4 * PAGE_SIZE)
6040                 max_list_size = 4 * PAGE_SIZE;
6041         if (max_list_size > (AHD_SCB_MAX_ALLOC * sg_list_increment))
6042                 max_list_size = (AHD_SCB_MAX_ALLOC * sg_list_increment);
6043         while ((sg_list_size + sg_list_increment) <= max_list_size
6044            &&  (sg_list_size % PAGE_SIZE) != 0) {
6045                 bus_size_t new_mod;
6046                 bus_size_t best_mod;
6047
6048                 sg_list_size += sg_list_increment;
6049                 new_mod = sg_list_size % PAGE_SIZE;
6050                 best_mod = best_list_size % PAGE_SIZE;
6051                 if (new_mod > best_mod || new_mod == 0) {
6052                         best_list_size = sg_list_size;
6053                 }
6054         }
6055         return (best_list_size);
6056 }
6057
6058 /*
6059  * Allocate a controller structure for a new device
6060  * and perform initial initializion.
6061  */
6062 struct ahd_softc *
6063 ahd_alloc(void *platform_arg, char *name)
6064 {
6065         struct  ahd_softc *ahd;
6066
6067 #ifndef __FreeBSD__
6068         ahd = malloc(sizeof(*ahd), M_DEVBUF, M_NOWAIT);
6069         if (!ahd) {
6070                 printf("aic7xxx: cannot malloc softc!\n");
6071                 free(name, M_DEVBUF);
6072                 return NULL;
6073         }
6074 #else
6075         ahd = device_get_softc((device_t)platform_arg);
6076 #endif
6077         memset(ahd, 0, sizeof(*ahd));
6078         ahd->seep_config = malloc(sizeof(*ahd->seep_config),
6079                                   M_DEVBUF, M_NOWAIT);
6080         if (ahd->seep_config == NULL) {
6081 #ifndef __FreeBSD__
6082                 free(ahd, M_DEVBUF);
6083 #endif
6084                 free(name, M_DEVBUF);
6085                 return (NULL);
6086         }
6087         LIST_INIT(&ahd->pending_scbs);
6088         /* We don't know our unit number until the OSM sets it */
6089         ahd->name = name;
6090         ahd->unit = -1;
6091         ahd->description = NULL;
6092         ahd->bus_description = NULL;
6093         ahd->channel = 'A';
6094         ahd->chip = AHD_NONE;
6095         ahd->features = AHD_FENONE;
6096         ahd->bugs = AHD_BUGNONE;
6097         ahd->flags = AHD_SPCHK_ENB_A|AHD_RESET_BUS_A|AHD_TERM_ENB_A
6098                    | AHD_EXTENDED_TRANS_A|AHD_STPWLEVEL_A;
6099         ahd_timer_init(&ahd->reset_timer);
6100         ahd_timer_init(&ahd->stat_timer);
6101         ahd->int_coalescing_timer = AHD_INT_COALESCING_TIMER_DEFAULT;
6102         ahd->int_coalescing_maxcmds = AHD_INT_COALESCING_MAXCMDS_DEFAULT;
6103         ahd->int_coalescing_mincmds = AHD_INT_COALESCING_MINCMDS_DEFAULT;
6104         ahd->int_coalescing_threshold = AHD_INT_COALESCING_THRESHOLD_DEFAULT;
6105         ahd->int_coalescing_stop_threshold =
6106             AHD_INT_COALESCING_STOP_THRESHOLD_DEFAULT;
6107
6108         if (ahd_platform_alloc(ahd, platform_arg) != 0) {
6109                 ahd_free(ahd);
6110                 ahd = NULL;
6111         }
6112 #ifdef AHD_DEBUG
6113         if ((ahd_debug & AHD_SHOW_MEMORY) != 0) {
6114                 printf("%s: scb size = 0x%x, hscb size = 0x%x\n",
6115                        ahd_name(ahd), (u_int)sizeof(struct scb),
6116                        (u_int)sizeof(struct hardware_scb));
6117         }
6118 #endif
6119         return (ahd);
6120 }
6121
6122 int
6123 ahd_softc_init(struct ahd_softc *ahd)
6124 {
6125
6126         ahd->unpause = 0;
6127         ahd->pause = PAUSE;
6128         return (0);
6129 }
6130
6131 void
6132 ahd_set_unit(struct ahd_softc *ahd, int unit)
6133 {
6134         ahd->unit = unit;
6135 }
6136
6137 void
6138 ahd_set_name(struct ahd_softc *ahd, char *name)
6139 {
6140         if (ahd->name != NULL)
6141                 free(ahd->name, M_DEVBUF);
6142         ahd->name = name;
6143 }
6144
6145 void
6146 ahd_free(struct ahd_softc *ahd)
6147 {
6148         int i;
6149
6150         switch (ahd->init_level) {
6151         default:
6152         case 5:
6153                 ahd_shutdown(ahd);
6154                 /* FALLTHROUGH */
6155         case 4:
6156                 ahd_dmamap_unload(ahd, ahd->shared_data_dmat,
6157                                   ahd->shared_data_map.dmamap);
6158                 /* FALLTHROUGH */
6159         case 3:
6160                 ahd_dmamem_free(ahd, ahd->shared_data_dmat, ahd->qoutfifo,
6161                                 ahd->shared_data_map.dmamap);
6162                 ahd_dmamap_destroy(ahd, ahd->shared_data_dmat,
6163                                    ahd->shared_data_map.dmamap);
6164                 /* FALLTHROUGH */
6165         case 2:
6166                 ahd_dma_tag_destroy(ahd, ahd->shared_data_dmat);
6167         case 1:
6168 #ifndef __linux__
6169                 ahd_dma_tag_destroy(ahd, ahd->buffer_dmat);
6170 #endif
6171                 break;
6172         case 0:
6173                 break;
6174         }
6175
6176 #ifndef __linux__
6177         ahd_dma_tag_destroy(ahd, ahd->parent_dmat);
6178 #endif
6179         ahd_platform_free(ahd);
6180         ahd_fini_scbdata(ahd);
6181         for (i = 0; i < AHD_NUM_TARGETS; i++) {
6182                 struct ahd_tmode_tstate *tstate;
6183
6184                 tstate = ahd->enabled_targets[i];
6185                 if (tstate != NULL) {
6186 #ifdef AHD_TARGET_MODE
6187                         int j;
6188
6189                         for (j = 0; j < AHD_NUM_LUNS; j++) {
6190                                 struct ahd_tmode_lstate *lstate;
6191
6192                                 lstate = tstate->enabled_luns[j];
6193                                 if (lstate != NULL) {
6194                                         xpt_free_path(lstate->path);
6195                                         free(lstate, M_DEVBUF);
6196                                 }
6197                         }
6198 #endif
6199                         free(tstate, M_DEVBUF);
6200                 }
6201         }
6202 #ifdef AHD_TARGET_MODE
6203         if (ahd->black_hole != NULL) {
6204                 xpt_free_path(ahd->black_hole->path);
6205                 free(ahd->black_hole, M_DEVBUF);
6206         }
6207 #endif
6208         if (ahd->name != NULL)
6209                 free(ahd->name, M_DEVBUF);
6210         if (ahd->seep_config != NULL)
6211                 free(ahd->seep_config, M_DEVBUF);
6212         if (ahd->saved_stack != NULL)
6213                 free(ahd->saved_stack, M_DEVBUF);
6214 #ifndef __FreeBSD__
6215         free(ahd, M_DEVBUF);
6216 #endif
6217         return;
6218 }
6219
6220 static void
6221 ahd_shutdown(void *arg)
6222 {
6223         struct  ahd_softc *ahd;
6224
6225         ahd = (struct ahd_softc *)arg;
6226
6227         /*
6228          * Stop periodic timer callbacks.
6229          */
6230         ahd_timer_stop(&ahd->reset_timer);
6231         ahd_timer_stop(&ahd->stat_timer);
6232
6233         /* This will reset most registers to 0, but not all */
6234         ahd_reset(ahd, /*reinit*/FALSE);
6235 }
6236
6237 /*
6238  * Reset the controller and record some information about it
6239  * that is only available just after a reset.  If "reinit" is
6240  * non-zero, this reset occured after initial configuration
6241  * and the caller requests that the chip be fully reinitialized
6242  * to a runable state.  Chip interrupts are *not* enabled after
6243  * a reinitialization.  The caller must enable interrupts via
6244  * ahd_intr_enable().
6245  */
6246 int
6247 ahd_reset(struct ahd_softc *ahd, int reinit)
6248 {
6249         u_int    sxfrctl1;
6250         int      wait;
6251         uint32_t cmd;
6252
6253         /*
6254          * Preserve the value of the SXFRCTL1 register for all channels.
6255          * It contains settings that affect termination and we don't want
6256          * to disturb the integrity of the bus.
6257          */
6258         ahd_pause(ahd);
6259         ahd_update_modes(ahd);
6260         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
6261         sxfrctl1 = ahd_inb(ahd, SXFRCTL1);
6262
6263         cmd = ahd_pci_read_config(ahd->dev_softc, PCIR_COMMAND, /*bytes*/2);
6264         if ((ahd->bugs & AHD_PCIX_CHIPRST_BUG) != 0) {
6265                 uint32_t mod_cmd;
6266
6267                 /*
6268                  * A4 Razor #632
6269                  * During the assertion of CHIPRST, the chip
6270                  * does not disable its parity logic prior to
6271                  * the start of the reset.  This may cause a
6272                  * parity error to be detected and thus a
6273                  * spurious SERR or PERR assertion.  Disble
6274                  * PERR and SERR responses during the CHIPRST.
6275                  */
6276                 mod_cmd = cmd & ~(PCIM_CMD_PERRESPEN|PCIM_CMD_SERRESPEN);
6277                 ahd_pci_write_config(ahd->dev_softc, PCIR_COMMAND,
6278                                      mod_cmd, /*bytes*/2);
6279         }
6280         ahd_outb(ahd, HCNTRL, CHIPRST | ahd->pause);
6281
6282         /*
6283          * Ensure that the reset has finished.  We delay 1000us
6284          * prior to reading the register to make sure the chip
6285          * has sufficiently completed its reset to handle register
6286          * accesses.
6287          */
6288         wait = 1000;
6289         do {
6290                 ahd_delay(1000);
6291         } while (--wait && !(ahd_inb(ahd, HCNTRL) & CHIPRSTACK));
6292
6293         if (wait == 0) {
6294                 printf("%s: WARNING - Failed chip reset!  "
6295                        "Trying to initialize anyway.\n", ahd_name(ahd));
6296         }
6297         ahd_outb(ahd, HCNTRL, ahd->pause);
6298
6299         if ((ahd->bugs & AHD_PCIX_CHIPRST_BUG) != 0) {
6300                 /*
6301                  * Clear any latched PCI error status and restore
6302                  * previous SERR and PERR response enables.
6303                  */
6304                 ahd_pci_write_config(ahd->dev_softc, PCIR_STATUS + 1,
6305                                      0xFF, /*bytes*/1);
6306                 ahd_pci_write_config(ahd->dev_softc, PCIR_COMMAND,
6307                                      cmd, /*bytes*/2);
6308         }
6309
6310         /*
6311          * Mode should be SCSI after a chip reset, but lets
6312          * set it just to be safe.  We touch the MODE_PTR
6313          * register directly so as to bypass the lazy update
6314          * code in ahd_set_modes().
6315          */
6316         ahd_known_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
6317         ahd_outb(ahd, MODE_PTR,
6318                  ahd_build_mode_state(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI));
6319
6320         /*
6321          * Restore SXFRCTL1.
6322          *
6323          * We must always initialize STPWEN to 1 before we
6324          * restore the saved values.  STPWEN is initialized
6325          * to a tri-state condition which can only be cleared
6326          * by turning it on.
6327          */
6328         ahd_outb(ahd, SXFRCTL1, sxfrctl1|STPWEN);
6329         ahd_outb(ahd, SXFRCTL1, sxfrctl1);
6330
6331         /* Determine chip configuration */
6332         ahd->features &= ~AHD_WIDE;
6333         if ((ahd_inb(ahd, SBLKCTL) & SELWIDE) != 0)
6334                 ahd->features |= AHD_WIDE;
6335
6336         /*
6337          * If a recovery action has forced a chip reset,
6338          * re-initialize the chip to our liking.
6339          */
6340         if (reinit != 0)
6341                 ahd_chip_init(ahd);
6342
6343         return (0);
6344 }
6345
6346 /*
6347  * Determine the number of SCBs available on the controller
6348  */
6349 static int
6350 ahd_probe_scbs(struct ahd_softc *ahd) {
6351         int i;
6352
6353         AHD_ASSERT_MODES(ahd, ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK),
6354                          ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK));
6355         for (i = 0; i < AHD_SCB_MAX; i++) {
6356                 int j;
6357
6358                 ahd_set_scbptr(ahd, i);
6359                 ahd_outw(ahd, SCB_BASE, i);
6360                 for (j = 2; j < 64; j++)
6361                         ahd_outb(ahd, SCB_BASE+j, 0);
6362                 /* Start out life as unallocated (needing an abort) */
6363                 ahd_outb(ahd, SCB_CONTROL, MK_MESSAGE);
6364                 if (ahd_inw_scbram(ahd, SCB_BASE) != i)
6365                         break;
6366                 ahd_set_scbptr(ahd, 0);
6367                 if (ahd_inw_scbram(ahd, SCB_BASE) != 0)
6368                         break;
6369         }
6370         return (i);
6371 }
6372
6373 static void
6374 ahd_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error)
6375 {
6376         dma_addr_t *baddr;
6377
6378         baddr = (dma_addr_t *)arg;
6379         *baddr = segs->ds_addr;
6380 }
6381
6382 static void
6383 ahd_initialize_hscbs(struct ahd_softc *ahd)
6384 {
6385         int i;
6386
6387         for (i = 0; i < ahd->scb_data.maxhscbs; i++) {
6388                 ahd_set_scbptr(ahd, i);
6389
6390                 /* Clear the control byte. */
6391                 ahd_outb(ahd, SCB_CONTROL, 0);
6392
6393                 /* Set the next pointer */
6394                 ahd_outw(ahd, SCB_NEXT, SCB_LIST_NULL);
6395         }
6396 }
6397
6398 static int
6399 ahd_init_scbdata(struct ahd_softc *ahd)
6400 {
6401         struct  scb_data *scb_data;
6402         int     i;
6403
6404         scb_data = &ahd->scb_data;
6405         TAILQ_INIT(&scb_data->free_scbs);
6406         for (i = 0; i < AHD_NUM_TARGETS * AHD_NUM_LUNS_NONPKT; i++)
6407                 LIST_INIT(&scb_data->free_scb_lists[i]);
6408         LIST_INIT(&scb_data->any_dev_free_scb_list);
6409         SLIST_INIT(&scb_data->hscb_maps);
6410         SLIST_INIT(&scb_data->sg_maps);
6411         SLIST_INIT(&scb_data->sense_maps);
6412
6413         /* Determine the number of hardware SCBs and initialize them */
6414         scb_data->maxhscbs = ahd_probe_scbs(ahd);
6415         if (scb_data->maxhscbs == 0) {
6416                 printf("%s: No SCB space found\n", ahd_name(ahd));
6417                 return (ENXIO);
6418         }
6419
6420         ahd_initialize_hscbs(ahd);
6421
6422         /*
6423          * Create our DMA tags.  These tags define the kinds of device
6424          * accessible memory allocations and memory mappings we will
6425          * need to perform during normal operation.
6426          *
6427          * Unless we need to further restrict the allocation, we rely
6428          * on the restrictions of the parent dmat, hence the common
6429          * use of MAXADDR and MAXSIZE.
6430          */
6431
6432         /* DMA tag for our hardware scb structures */
6433         if (ahd_dma_tag_create(ahd, ahd->parent_dmat, /*alignment*/1,
6434                                /*boundary*/BUS_SPACE_MAXADDR_32BIT + 1,
6435                                /*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
6436                                /*highaddr*/BUS_SPACE_MAXADDR,
6437                                /*filter*/NULL, /*filterarg*/NULL,
6438                                PAGE_SIZE, /*nsegments*/1,
6439                                /*maxsegsz*/BUS_SPACE_MAXSIZE_32BIT,
6440                                /*flags*/0, &scb_data->hscb_dmat) != 0) {
6441                 goto error_exit;
6442         }
6443
6444         scb_data->init_level++;
6445
6446         /* DMA tag for our S/G structures. */
6447         if (ahd_dma_tag_create(ahd, ahd->parent_dmat, /*alignment*/8,
6448                                /*boundary*/BUS_SPACE_MAXADDR_32BIT + 1,
6449                                /*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
6450                                /*highaddr*/BUS_SPACE_MAXADDR,
6451                                /*filter*/NULL, /*filterarg*/NULL,
6452                                ahd_sglist_allocsize(ahd), /*nsegments*/1,
6453                                /*maxsegsz*/BUS_SPACE_MAXSIZE_32BIT,
6454                                /*flags*/0, &scb_data->sg_dmat) != 0) {
6455                 goto error_exit;
6456         }
6457 #ifdef AHD_DEBUG
6458         if ((ahd_debug & AHD_SHOW_MEMORY) != 0)
6459                 printf("%s: ahd_sglist_allocsize = 0x%x\n", ahd_name(ahd),
6460                        ahd_sglist_allocsize(ahd));
6461 #endif
6462
6463         scb_data->init_level++;
6464
6465         /* DMA tag for our sense buffers.  We allocate in page sized chunks */
6466         if (ahd_dma_tag_create(ahd, ahd->parent_dmat, /*alignment*/1,
6467                                /*boundary*/BUS_SPACE_MAXADDR_32BIT + 1,
6468                                /*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
6469                                /*highaddr*/BUS_SPACE_MAXADDR,
6470                                /*filter*/NULL, /*filterarg*/NULL,
6471                                PAGE_SIZE, /*nsegments*/1,
6472                                /*maxsegsz*/BUS_SPACE_MAXSIZE_32BIT,
6473                                /*flags*/0, &scb_data->sense_dmat) != 0) {
6474                 goto error_exit;
6475         }
6476
6477         scb_data->init_level++;
6478
6479         /* Perform initial CCB allocation */
6480         ahd_alloc_scbs(ahd);
6481
6482         if (scb_data->numscbs == 0) {
6483                 printf("%s: ahd_init_scbdata - "
6484                        "Unable to allocate initial scbs\n",
6485                        ahd_name(ahd));
6486                 goto error_exit;
6487         }
6488
6489         /*
6490          * Note that we were successfull
6491          */
6492         return (0);
6493
6494 error_exit:
6495
6496         return (ENOMEM);
6497 }
6498
6499 static struct scb *
6500 ahd_find_scb_by_tag(struct ahd_softc *ahd, u_int tag)
6501 {
6502         struct scb *scb;
6503
6504         /*
6505          * Look on the pending list.
6506          */
6507         LIST_FOREACH(scb, &ahd->pending_scbs, pending_links) {
6508                 if (SCB_GET_TAG(scb) == tag)
6509                         return (scb);
6510         }
6511
6512         /*
6513          * Then on all of the collision free lists.
6514          */
6515         TAILQ_FOREACH(scb, &ahd->scb_data.free_scbs, links.tqe) {
6516                 struct scb *list_scb;
6517
6518                 list_scb = scb;
6519                 do {
6520                         if (SCB_GET_TAG(list_scb) == tag)
6521                                 return (list_scb);
6522                         list_scb = LIST_NEXT(list_scb, collision_links);
6523                 } while (list_scb);
6524         }
6525
6526         /*
6527          * And finally on the generic free list.
6528          */
6529         LIST_FOREACH(scb, &ahd->scb_data.any_dev_free_scb_list, links.le) {
6530                 if (SCB_GET_TAG(scb) == tag)
6531                         return (scb);
6532         }
6533
6534         return (NULL);
6535 }
6536
6537 static void
6538 ahd_fini_scbdata(struct ahd_softc *ahd)
6539 {
6540         struct scb_data *scb_data;
6541
6542         scb_data = &ahd->scb_data;
6543         if (scb_data == NULL)
6544                 return;
6545
6546         switch (scb_data->init_level) {
6547         default:
6548         case 7:
6549         {
6550                 struct map_node *sns_map;
6551
6552                 while ((sns_map = SLIST_FIRST(&scb_data->sense_maps)) != NULL) {
6553                         SLIST_REMOVE_HEAD(&scb_data->sense_maps, links);
6554                         ahd_dmamap_unload(ahd, scb_data->sense_dmat,
6555                                           sns_map->dmamap);
6556                         ahd_dmamem_free(ahd, scb_data->sense_dmat,
6557                                         sns_map->vaddr, sns_map->dmamap);
6558                         free(sns_map, M_DEVBUF);
6559                 }
6560                 ahd_dma_tag_destroy(ahd, scb_data->sense_dmat);
6561                 /* FALLTHROUGH */
6562         }
6563         case 6:
6564         {
6565                 struct map_node *sg_map;
6566
6567                 while ((sg_map = SLIST_FIRST(&scb_data->sg_maps)) != NULL) {
6568                         SLIST_REMOVE_HEAD(&scb_data->sg_maps, links);
6569                         ahd_dmamap_unload(ahd, scb_data->sg_dmat,
6570                                           sg_map->dmamap);
6571                         ahd_dmamem_free(ahd, scb_data->sg_dmat,
6572                                         sg_map->vaddr, sg_map->dmamap);
6573                         free(sg_map, M_DEVBUF);
6574                 }
6575                 ahd_dma_tag_destroy(ahd, scb_data->sg_dmat);
6576                 /* FALLTHROUGH */
6577         }
6578         case 5:
6579         {
6580                 struct map_node *hscb_map;
6581
6582                 while ((hscb_map = SLIST_FIRST(&scb_data->hscb_maps)) != NULL) {
6583                         SLIST_REMOVE_HEAD(&scb_data->hscb_maps, links);
6584                         ahd_dmamap_unload(ahd, scb_data->hscb_dmat,
6585                                           hscb_map->dmamap);
6586                         ahd_dmamem_free(ahd, scb_data->hscb_dmat,
6587                                         hscb_map->vaddr, hscb_map->dmamap);
6588                         free(hscb_map, M_DEVBUF);
6589                 }
6590                 ahd_dma_tag_destroy(ahd, scb_data->hscb_dmat);
6591                 /* FALLTHROUGH */
6592         }
6593         case 4:
6594         case 3:
6595         case 2:
6596         case 1:
6597         case 0:
6598                 break;
6599         }
6600 }
6601
6602 /*
6603  * DSP filter Bypass must be enabled until the first selection
6604  * after a change in bus mode (Razor #491 and #493).
6605  */
6606 static void
6607 ahd_setup_iocell_workaround(struct ahd_softc *ahd)
6608 {
6609         ahd_mode_state saved_modes;
6610
6611         saved_modes = ahd_save_modes(ahd);
6612         ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
6613         ahd_outb(ahd, DSPDATACTL, ahd_inb(ahd, DSPDATACTL)
6614                | BYPASSENAB | RCVROFFSTDIS | XMITOFFSTDIS);
6615         ahd_outb(ahd, SIMODE0, ahd_inb(ahd, SIMODE0) | (ENSELDO|ENSELDI));
6616 #ifdef AHD_DEBUG
6617         if ((ahd_debug & AHD_SHOW_MISC) != 0)
6618                 printf("%s: Setting up iocell workaround\n", ahd_name(ahd));
6619 #endif
6620         ahd_restore_modes(ahd, saved_modes);
6621         ahd->flags &= ~AHD_HAD_FIRST_SEL;
6622 }
6623
6624 static void
6625 ahd_iocell_first_selection(struct ahd_softc *ahd)
6626 {
6627         ahd_mode_state  saved_modes;
6628         u_int           sblkctl;
6629
6630         if ((ahd->flags & AHD_HAD_FIRST_SEL) != 0)
6631                 return;
6632         saved_modes = ahd_save_modes(ahd);
6633         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
6634         sblkctl = ahd_inb(ahd, SBLKCTL);
6635         ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
6636 #ifdef AHD_DEBUG
6637         if ((ahd_debug & AHD_SHOW_MISC) != 0)
6638                 printf("%s: iocell first selection\n", ahd_name(ahd));
6639 #endif
6640         if ((sblkctl & ENAB40) != 0) {
6641                 ahd_outb(ahd, DSPDATACTL,
6642                          ahd_inb(ahd, DSPDATACTL) & ~BYPASSENAB);
6643 #ifdef AHD_DEBUG
6644                 if ((ahd_debug & AHD_SHOW_MISC) != 0)
6645                         printf("%s: BYPASS now disabled\n", ahd_name(ahd));
6646 #endif
6647         }
6648         ahd_outb(ahd, SIMODE0, ahd_inb(ahd, SIMODE0) & ~(ENSELDO|ENSELDI));
6649         ahd_outb(ahd, CLRINT, CLRSCSIINT);
6650         ahd_restore_modes(ahd, saved_modes);
6651         ahd->flags |= AHD_HAD_FIRST_SEL;
6652 }
6653
6654 /*************************** SCB Management ***********************************/
6655 static void
6656 ahd_add_col_list(struct ahd_softc *ahd, struct scb *scb, u_int col_idx)
6657 {
6658         struct  scb_list *free_list;
6659         struct  scb_tailq *free_tailq;
6660         struct  scb *first_scb;
6661
6662         scb->flags |= SCB_ON_COL_LIST;
6663         AHD_SET_SCB_COL_IDX(scb, col_idx);
6664         free_list = &ahd->scb_data.free_scb_lists[col_idx];
6665         free_tailq = &ahd->scb_data.free_scbs;
6666         first_scb = LIST_FIRST(free_list);
6667         if (first_scb != NULL) {
6668                 LIST_INSERT_AFTER(first_scb, scb, collision_links);
6669         } else {
6670                 LIST_INSERT_HEAD(free_list, scb, collision_links);
6671                 TAILQ_INSERT_TAIL(free_tailq, scb, links.tqe);
6672         }
6673 }
6674
6675 static void
6676 ahd_rem_col_list(struct ahd_softc *ahd, struct scb *scb)
6677 {
6678         struct  scb_list *free_list;
6679         struct  scb_tailq *free_tailq;
6680         struct  scb *first_scb;
6681         u_int   col_idx;
6682
6683         scb->flags &= ~SCB_ON_COL_LIST;
6684         col_idx = AHD_GET_SCB_COL_IDX(ahd, scb);
6685         free_list = &ahd->scb_data.free_scb_lists[col_idx];
6686         free_tailq = &ahd->scb_data.free_scbs;
6687         first_scb = LIST_FIRST(free_list);
6688         if (first_scb == scb) {
6689                 struct scb *next_scb;
6690
6691                 /*
6692                  * Maintain order in the collision free
6693                  * lists for fairness if this device has
6694                  * other colliding tags active.
6695                  */
6696                 next_scb = LIST_NEXT(scb, collision_links);
6697                 if (next_scb != NULL) {
6698                         TAILQ_INSERT_AFTER(free_tailq, scb,
6699                                            next_scb, links.tqe);
6700                 }
6701                 TAILQ_REMOVE(free_tailq, scb, links.tqe);
6702         }
6703         LIST_REMOVE(scb, collision_links);
6704 }
6705
6706 /*
6707  * Get a free scb. If there are none, see if we can allocate a new SCB.
6708  */
6709 struct scb *
6710 ahd_get_scb(struct ahd_softc *ahd, u_int col_idx)
6711 {
6712         struct scb *scb;
6713         int tries;
6714
6715         tries = 0;
6716 look_again:
6717         TAILQ_FOREACH(scb, &ahd->scb_data.free_scbs, links.tqe) {
6718                 if (AHD_GET_SCB_COL_IDX(ahd, scb) != col_idx) {
6719                         ahd_rem_col_list(ahd, scb);
6720                         goto found;
6721                 }
6722         }
6723         if ((scb = LIST_FIRST(&ahd->scb_data.any_dev_free_scb_list)) == NULL) {
6724
6725                 if (tries++ != 0)
6726                         return (NULL);
6727                 ahd_alloc_scbs(ahd);
6728                 goto look_again;
6729         }
6730         LIST_REMOVE(scb, links.le);
6731         if (col_idx != AHD_NEVER_COL_IDX
6732          && (scb->col_scb != NULL)
6733          && (scb->col_scb->flags & SCB_ACTIVE) == 0) {
6734                 LIST_REMOVE(scb->col_scb, links.le);
6735                 ahd_add_col_list(ahd, scb->col_scb, col_idx);
6736         }
6737 found:
6738         scb->flags |= SCB_ACTIVE;
6739         return (scb);
6740 }
6741
6742 /*
6743  * Return an SCB resource to the free list.
6744  */
6745 void
6746 ahd_free_scb(struct ahd_softc *ahd, struct scb *scb)
6747 {
6748         /* Clean up for the next user */
6749         scb->flags = SCB_FLAG_NONE;
6750         scb->hscb->control = 0;
6751         ahd->scb_data.scbindex[SCB_GET_TAG(scb)] = NULL;
6752
6753         if (scb->col_scb == NULL) {
6754
6755                 /*
6756                  * No collision possible.  Just free normally.
6757                  */
6758                 LIST_INSERT_HEAD(&ahd->scb_data.any_dev_free_scb_list,
6759                                  scb, links.le);
6760         } else if ((scb->col_scb->flags & SCB_ON_COL_LIST) != 0) {
6761
6762                 /*
6763                  * The SCB we might have collided with is on
6764                  * a free collision list.  Put both SCBs on
6765                  * the generic list.
6766                  */
6767                 ahd_rem_col_list(ahd, scb->col_scb);
6768                 LIST_INSERT_HEAD(&ahd->scb_data.any_dev_free_scb_list,
6769                                  scb, links.le);
6770                 LIST_INSERT_HEAD(&ahd->scb_data.any_dev_free_scb_list,
6771                                  scb->col_scb, links.le);
6772         } else if ((scb->col_scb->flags
6773                   & (SCB_PACKETIZED|SCB_ACTIVE)) == SCB_ACTIVE
6774                 && (scb->col_scb->hscb->control & TAG_ENB) != 0) {
6775
6776                 /*
6777                  * The SCB we might collide with on the next allocation
6778                  * is still active in a non-packetized, tagged, context.
6779                  * Put us on the SCB collision list.
6780                  */
6781                 ahd_add_col_list(ahd, scb,
6782                                  AHD_GET_SCB_COL_IDX(ahd, scb->col_scb));
6783         } else {
6784                 /*
6785                  * The SCB we might collide with on the next allocation
6786                  * is either active in a packetized context, or free.
6787                  * Since we can't collide, put this SCB on the generic
6788                  * free list.
6789                  */
6790                 LIST_INSERT_HEAD(&ahd->scb_data.any_dev_free_scb_list,
6791                                  scb, links.le);
6792         }
6793
6794         ahd_platform_scb_free(ahd, scb);
6795 }
6796
6797 static void
6798 ahd_alloc_scbs(struct ahd_softc *ahd)
6799 {
6800         struct scb_data *scb_data;
6801         struct scb      *next_scb;
6802         struct hardware_scb *hscb;
6803         struct map_node *hscb_map;
6804         struct map_node *sg_map;
6805         struct map_node *sense_map;
6806         uint8_t         *segs;
6807         uint8_t         *sense_data;
6808         dma_addr_t       hscb_busaddr;
6809         dma_addr_t       sg_busaddr;
6810         dma_addr_t       sense_busaddr;
6811         int              newcount;
6812         int              i;
6813
6814         scb_data = &ahd->scb_data;
6815         if (scb_data->numscbs >= AHD_SCB_MAX_ALLOC)
6816                 /* Can't allocate any more */
6817                 return;
6818
6819         if (scb_data->scbs_left != 0) {
6820                 int offset;
6821
6822                 offset = (PAGE_SIZE / sizeof(*hscb)) - scb_data->scbs_left;
6823                 hscb_map = SLIST_FIRST(&scb_data->hscb_maps);
6824                 hscb = &((struct hardware_scb *)hscb_map->vaddr)[offset];
6825                 hscb_busaddr = hscb_map->physaddr + (offset * sizeof(*hscb));
6826         } else {
6827                 hscb_map = malloc(sizeof(*hscb_map), M_DEVBUF, M_NOWAIT);
6828
6829                 if (hscb_map == NULL)
6830                         return;
6831
6832                 /* Allocate the next batch of hardware SCBs */
6833                 if (ahd_dmamem_alloc(ahd, scb_data->hscb_dmat,
6834                                      (void **)&hscb_map->vaddr,
6835                                      BUS_DMA_NOWAIT, &hscb_map->dmamap) != 0) {
6836                         free(hscb_map, M_DEVBUF);
6837                         return;
6838                 }
6839
6840                 SLIST_INSERT_HEAD(&scb_data->hscb_maps, hscb_map, links);
6841
6842                 ahd_dmamap_load(ahd, scb_data->hscb_dmat, hscb_map->dmamap,
6843                                 hscb_map->vaddr, PAGE_SIZE, ahd_dmamap_cb,
6844                                 &hscb_map->physaddr, /*flags*/0);
6845
6846                 hscb = (struct hardware_scb *)hscb_map->vaddr;
6847                 hscb_busaddr = hscb_map->physaddr;
6848                 scb_data->scbs_left = PAGE_SIZE / sizeof(*hscb);
6849         }
6850
6851         if (scb_data->sgs_left != 0) {
6852                 int offset;
6853
6854                 offset = ((ahd_sglist_allocsize(ahd) / ahd_sglist_size(ahd))
6855                        - scb_data->sgs_left) * ahd_sglist_size(ahd);
6856                 sg_map = SLIST_FIRST(&scb_data->sg_maps);
6857                 segs = sg_map->vaddr + offset;
6858                 sg_busaddr = sg_map->physaddr + offset;
6859         } else {
6860                 sg_map = malloc(sizeof(*sg_map), M_DEVBUF, M_NOWAIT);
6861
6862                 if (sg_map == NULL)
6863                         return;
6864
6865                 /* Allocate the next batch of S/G lists */
6866                 if (ahd_dmamem_alloc(ahd, scb_data->sg_dmat,
6867                                      (void **)&sg_map->vaddr,
6868                                      BUS_DMA_NOWAIT, &sg_map->dmamap) != 0) {
6869                         free(sg_map, M_DEVBUF);
6870                         return;
6871                 }
6872
6873                 SLIST_INSERT_HEAD(&scb_data->sg_maps, sg_map, links);
6874
6875                 ahd_dmamap_load(ahd, scb_data->sg_dmat, sg_map->dmamap,
6876                                 sg_map->vaddr, ahd_sglist_allocsize(ahd),
6877                                 ahd_dmamap_cb, &sg_map->physaddr, /*flags*/0);
6878
6879                 segs = sg_map->vaddr;
6880                 sg_busaddr = sg_map->physaddr;
6881                 scb_data->sgs_left =
6882                     ahd_sglist_allocsize(ahd) / ahd_sglist_size(ahd);
6883 #ifdef AHD_DEBUG
6884                 if (ahd_debug & AHD_SHOW_MEMORY)
6885                         printf("Mapped SG data\n");
6886 #endif
6887         }
6888
6889         if (scb_data->sense_left != 0) {
6890                 int offset;
6891
6892                 offset = PAGE_SIZE - (AHD_SENSE_BUFSIZE * scb_data->sense_left);
6893                 sense_map = SLIST_FIRST(&scb_data->sense_maps);
6894                 sense_data = sense_map->vaddr + offset;
6895                 sense_busaddr = sense_map->physaddr + offset;
6896         } else {
6897                 sense_map = malloc(sizeof(*sense_map), M_DEVBUF, M_NOWAIT);
6898
6899                 if (sense_map == NULL)
6900                         return;
6901
6902                 /* Allocate the next batch of sense buffers */
6903                 if (ahd_dmamem_alloc(ahd, scb_data->sense_dmat,
6904                                      (void **)&sense_map->vaddr,
6905                                      BUS_DMA_NOWAIT, &sense_map->dmamap) != 0) {
6906                         free(sense_map, M_DEVBUF);
6907                         return;
6908                 }
6909
6910                 SLIST_INSERT_HEAD(&scb_data->sense_maps, sense_map, links);
6911
6912                 ahd_dmamap_load(ahd, scb_data->sense_dmat, sense_map->dmamap,
6913                                 sense_map->vaddr, PAGE_SIZE, ahd_dmamap_cb,
6914                                 &sense_map->physaddr, /*flags*/0);
6915
6916                 sense_data = sense_map->vaddr;
6917                 sense_busaddr = sense_map->physaddr;
6918                 scb_data->sense_left = PAGE_SIZE / AHD_SENSE_BUFSIZE;
6919 #ifdef AHD_DEBUG
6920                 if (ahd_debug & AHD_SHOW_MEMORY)
6921                         printf("Mapped sense data\n");
6922 #endif
6923         }
6924
6925         newcount = min(scb_data->sense_left, scb_data->scbs_left);
6926         newcount = min(newcount, scb_data->sgs_left);
6927         newcount = min(newcount, (AHD_SCB_MAX_ALLOC - scb_data->numscbs));
6928         for (i = 0; i < newcount; i++) {
6929                 struct scb_platform_data *pdata;
6930                 u_int col_tag;
6931 #ifndef __linux__
6932                 int error;
6933 #endif
6934
6935                 next_scb = (struct scb *)malloc(sizeof(*next_scb),
6936                                                 M_DEVBUF, M_NOWAIT);
6937                 if (next_scb == NULL)
6938                         break;
6939
6940                 pdata = (struct scb_platform_data *)malloc(sizeof(*pdata),
6941                                                            M_DEVBUF, M_NOWAIT);
6942                 if (pdata == NULL) {
6943                         free(next_scb, M_DEVBUF);
6944                         break;
6945                 }
6946                 next_scb->platform_data = pdata;
6947                 next_scb->hscb_map = hscb_map;
6948                 next_scb->sg_map = sg_map;
6949                 next_scb->sense_map = sense_map;
6950                 next_scb->sg_list = segs;
6951                 next_scb->sense_data = sense_data;
6952                 next_scb->sense_busaddr = sense_busaddr;
6953                 memset(hscb, 0, sizeof(*hscb));
6954                 next_scb->hscb = hscb;
6955                 hscb->hscb_busaddr = ahd_htole32(hscb_busaddr);
6956
6957                 /*
6958                  * The sequencer always starts with the second entry.
6959                  * The first entry is embedded in the scb.
6960                  */
6961                 next_scb->sg_list_busaddr = sg_busaddr;
6962                 if ((ahd->flags & AHD_64BIT_ADDRESSING) != 0)
6963                         next_scb->sg_list_busaddr
6964                             += sizeof(struct ahd_dma64_seg);
6965                 else
6966                         next_scb->sg_list_busaddr += sizeof(struct ahd_dma_seg);
6967                 next_scb->ahd_softc = ahd;
6968                 next_scb->flags = SCB_FLAG_NONE;
6969 #ifndef __linux__
6970                 error = ahd_dmamap_create(ahd, ahd->buffer_dmat, /*flags*/0,
6971                                           &next_scb->dmamap);
6972                 if (error != 0) {
6973                         free(next_scb, M_DEVBUF);
6974                         free(pdata, M_DEVBUF);
6975                         break;
6976                 }
6977 #endif
6978                 next_scb->hscb->tag = ahd_htole16(scb_data->numscbs);
6979                 col_tag = scb_data->numscbs ^ 0x100;
6980                 next_scb->col_scb = ahd_find_scb_by_tag(ahd, col_tag);
6981                 if (next_scb->col_scb != NULL)
6982                         next_scb->col_scb->col_scb = next_scb;
6983                 ahd_free_scb(ahd, next_scb);
6984                 hscb++;
6985                 hscb_busaddr += sizeof(*hscb);
6986                 segs += ahd_sglist_size(ahd);
6987                 sg_busaddr += ahd_sglist_size(ahd);
6988                 sense_data += AHD_SENSE_BUFSIZE;
6989                 sense_busaddr += AHD_SENSE_BUFSIZE;
6990                 scb_data->numscbs++;
6991                 scb_data->sense_left--;
6992                 scb_data->scbs_left--;
6993                 scb_data->sgs_left--;
6994         }
6995 }
6996
6997 void
6998 ahd_controller_info(struct ahd_softc *ahd, char *buf)
6999 {
7000         const char *speed;
7001         const char *type;
7002         int len;
7003
7004         len = sprintf(buf, "%s: ", ahd_chip_names[ahd->chip & AHD_CHIPID_MASK]);
7005         buf += len;
7006
7007         speed = "Ultra320 ";
7008         if ((ahd->features & AHD_WIDE) != 0) {
7009                 type = "Wide ";
7010         } else {
7011                 type = "Single ";
7012         }
7013         len = sprintf(buf, "%s%sChannel %c, SCSI Id=%d, ",
7014                       speed, type, ahd->channel, ahd->our_id);
7015         buf += len;
7016
7017         sprintf(buf, "%s, %d SCBs", ahd->bus_description,
7018                 ahd->scb_data.maxhscbs);
7019 }
7020
7021 static const char *channel_strings[] = {
7022         "Primary Low",
7023         "Primary High",
7024         "Secondary Low",
7025         "Secondary High"
7026 };
7027
7028 static const char *termstat_strings[] = {
7029         "Terminated Correctly",
7030         "Over Terminated",
7031         "Under Terminated",
7032         "Not Configured"
7033 };
7034
7035 /***************************** Timer Facilities *******************************/
7036 #define ahd_timer_init init_timer
7037 #define ahd_timer_stop del_timer_sync
7038 typedef void ahd_linux_callback_t (u_long);
7039
7040 static void
7041 ahd_timer_reset(ahd_timer_t *timer, int usec, ahd_callback_t *func, void *arg)
7042 {
7043         struct ahd_softc *ahd;
7044
7045         ahd = (struct ahd_softc *)arg;
7046         del_timer(timer);
7047         timer->data = (u_long)arg;
7048         timer->expires = jiffies + (usec * HZ)/1000000;
7049         timer->function = (ahd_linux_callback_t*)func;
7050         add_timer(timer);
7051 }
7052
7053 /*
7054  * Start the board, ready for normal operation
7055  */
7056 int
7057 ahd_init(struct ahd_softc *ahd)
7058 {
7059         uint8_t         *next_vaddr;
7060         dma_addr_t       next_baddr;
7061         size_t           driver_data_size;
7062         int              i;
7063         int              error;
7064         u_int            warn_user;
7065         uint8_t          current_sensing;
7066         uint8_t          fstat;
7067
7068         AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
7069
7070         ahd->stack_size = ahd_probe_stack_size(ahd);
7071         ahd->saved_stack = malloc(ahd->stack_size * sizeof(uint16_t),
7072                                   M_DEVBUF, M_NOWAIT);
7073         if (ahd->saved_stack == NULL)
7074                 return (ENOMEM);
7075
7076         /*
7077          * Verify that the compiler hasn't over-agressively
7078          * padded important structures.
7079          */
7080         if (sizeof(struct hardware_scb) != 64)
7081                 panic("Hardware SCB size is incorrect");
7082
7083 #ifdef AHD_DEBUG
7084         if ((ahd_debug & AHD_DEBUG_SEQUENCER) != 0)
7085                 ahd->flags |= AHD_SEQUENCER_DEBUG;
7086 #endif
7087
7088         /*
7089          * Default to allowing initiator operations.
7090          */
7091         ahd->flags |= AHD_INITIATORROLE;
7092
7093         /*
7094          * Only allow target mode features if this unit has them enabled.
7095          */
7096         if ((AHD_TMODE_ENABLE & (0x1 << ahd->unit)) == 0)
7097                 ahd->features &= ~AHD_TARGETMODE;
7098
7099 #ifndef __linux__
7100         /* DMA tag for mapping buffers into device visible space. */
7101         if (ahd_dma_tag_create(ahd, ahd->parent_dmat, /*alignment*/1,
7102                                /*boundary*/BUS_SPACE_MAXADDR_32BIT + 1,
7103                                /*lowaddr*/ahd->flags & AHD_39BIT_ADDRESSING
7104                                         ? (dma_addr_t)0x7FFFFFFFFFULL
7105                                         : BUS_SPACE_MAXADDR_32BIT,
7106                                /*highaddr*/BUS_SPACE_MAXADDR,
7107                                /*filter*/NULL, /*filterarg*/NULL,
7108                                /*maxsize*/(AHD_NSEG - 1) * PAGE_SIZE,
7109                                /*nsegments*/AHD_NSEG,
7110                                /*maxsegsz*/AHD_MAXTRANSFER_SIZE,
7111                                /*flags*/BUS_DMA_ALLOCNOW,
7112                                &ahd->buffer_dmat) != 0) {
7113                 return (ENOMEM);
7114         }
7115 #endif
7116
7117         ahd->init_level++;
7118
7119         /*
7120          * DMA tag for our command fifos and other data in system memory
7121          * the card's sequencer must be able to access.  For initiator
7122          * roles, we need to allocate space for the qoutfifo.  When providing
7123          * for the target mode role, we must additionally provide space for
7124          * the incoming target command fifo.
7125          */
7126         driver_data_size = AHD_SCB_MAX * sizeof(*ahd->qoutfifo)
7127                          + sizeof(struct hardware_scb);
7128         if ((ahd->features & AHD_TARGETMODE) != 0)
7129                 driver_data_size += AHD_TMODE_CMDS * sizeof(struct target_cmd);
7130         if ((ahd->bugs & AHD_PKT_BITBUCKET_BUG) != 0)
7131                 driver_data_size += PKT_OVERRUN_BUFSIZE;
7132         if (ahd_dma_tag_create(ahd, ahd->parent_dmat, /*alignment*/1,
7133                                /*boundary*/BUS_SPACE_MAXADDR_32BIT + 1,
7134                                /*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
7135                                /*highaddr*/BUS_SPACE_MAXADDR,
7136                                /*filter*/NULL, /*filterarg*/NULL,
7137                                driver_data_size,
7138                                /*nsegments*/1,
7139                                /*maxsegsz*/BUS_SPACE_MAXSIZE_32BIT,
7140                                /*flags*/0, &ahd->shared_data_dmat) != 0) {
7141                 return (ENOMEM);
7142         }
7143
7144         ahd->init_level++;
7145
7146         /* Allocation of driver data */
7147         if (ahd_dmamem_alloc(ahd, ahd->shared_data_dmat,
7148                              (void **)&ahd->shared_data_map.vaddr,
7149                              BUS_DMA_NOWAIT,
7150                              &ahd->shared_data_map.dmamap) != 0) {
7151                 return (ENOMEM);
7152         }
7153
7154         ahd->init_level++;
7155
7156         /* And permanently map it in */
7157         ahd_dmamap_load(ahd, ahd->shared_data_dmat, ahd->shared_data_map.dmamap,
7158                         ahd->shared_data_map.vaddr, driver_data_size,
7159                         ahd_dmamap_cb, &ahd->shared_data_map.physaddr,
7160                         /*flags*/0);
7161         ahd->qoutfifo = (struct ahd_completion *)ahd->shared_data_map.vaddr;
7162         next_vaddr = (uint8_t *)&ahd->qoutfifo[AHD_QOUT_SIZE];
7163         next_baddr = ahd->shared_data_map.physaddr
7164                    + AHD_QOUT_SIZE*sizeof(struct ahd_completion);
7165         if ((ahd->features & AHD_TARGETMODE) != 0) {
7166                 ahd->targetcmds = (struct target_cmd *)next_vaddr;
7167                 next_vaddr += AHD_TMODE_CMDS * sizeof(struct target_cmd);
7168                 next_baddr += AHD_TMODE_CMDS * sizeof(struct target_cmd);
7169         }
7170
7171         if ((ahd->bugs & AHD_PKT_BITBUCKET_BUG) != 0) {
7172                 ahd->overrun_buf = next_vaddr;
7173                 next_vaddr += PKT_OVERRUN_BUFSIZE;
7174                 next_baddr += PKT_OVERRUN_BUFSIZE;
7175         }
7176
7177         /*
7178          * We need one SCB to serve as the "next SCB".  Since the
7179          * tag identifier in this SCB will never be used, there is
7180          * no point in using a valid HSCB tag from an SCB pulled from
7181          * the standard free pool.  So, we allocate this "sentinel"
7182          * specially from the DMA safe memory chunk used for the QOUTFIFO.
7183          */
7184         ahd->next_queued_hscb = (struct hardware_scb *)next_vaddr;
7185         ahd->next_queued_hscb_map = &ahd->shared_data_map;
7186         ahd->next_queued_hscb->hscb_busaddr = ahd_htole32(next_baddr);
7187
7188         ahd->init_level++;
7189
7190         /* Allocate SCB data now that buffer_dmat is initialized */
7191         if (ahd_init_scbdata(ahd) != 0)
7192                 return (ENOMEM);
7193
7194         if ((ahd->flags & AHD_INITIATORROLE) == 0)
7195                 ahd->flags &= ~AHD_RESET_BUS_A;
7196
7197         /*
7198          * Before committing these settings to the chip, give
7199          * the OSM one last chance to modify our configuration.
7200          */
7201         ahd_platform_init(ahd);
7202
7203         /* Bring up the chip. */
7204         ahd_chip_init(ahd);
7205
7206         AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
7207
7208         if ((ahd->flags & AHD_CURRENT_SENSING) == 0)
7209                 goto init_done;
7210
7211         /*
7212          * Verify termination based on current draw and
7213          * warn user if the bus is over/under terminated.
7214          */
7215         error = ahd_write_flexport(ahd, FLXADDR_ROMSTAT_CURSENSECTL,
7216                                    CURSENSE_ENB);
7217         if (error != 0) {
7218                 printf("%s: current sensing timeout 1\n", ahd_name(ahd));
7219                 goto init_done;
7220         }
7221         for (i = 20, fstat = FLX_FSTAT_BUSY;
7222              (fstat & FLX_FSTAT_BUSY) != 0 && i; i--) {
7223                 error = ahd_read_flexport(ahd, FLXADDR_FLEXSTAT, &fstat);
7224                 if (error != 0) {
7225                         printf("%s: current sensing timeout 2\n",
7226                                ahd_name(ahd));
7227                         goto init_done;
7228                 }
7229         }
7230         if (i == 0) {
7231                 printf("%s: Timedout during current-sensing test\n",
7232                        ahd_name(ahd));
7233                 goto init_done;
7234         }
7235
7236         /* Latch Current Sensing status. */
7237         error = ahd_read_flexport(ahd, FLXADDR_CURRENT_STAT, &current_sensing);
7238         if (error != 0) {
7239                 printf("%s: current sensing timeout 3\n", ahd_name(ahd));
7240                 goto init_done;
7241         }
7242
7243         /* Diable current sensing. */
7244         ahd_write_flexport(ahd, FLXADDR_ROMSTAT_CURSENSECTL, 0);
7245
7246 #ifdef AHD_DEBUG
7247         if ((ahd_debug & AHD_SHOW_TERMCTL) != 0) {
7248                 printf("%s: current_sensing == 0x%x\n",
7249                        ahd_name(ahd), current_sensing);
7250         }
7251 #endif
7252         warn_user = 0;
7253         for (i = 0; i < 4; i++, current_sensing >>= FLX_CSTAT_SHIFT) {
7254                 u_int term_stat;
7255
7256                 term_stat = (current_sensing & FLX_CSTAT_MASK);
7257                 switch (term_stat) {
7258                 case FLX_CSTAT_OVER:
7259                 case FLX_CSTAT_UNDER:
7260                         warn_user++;
7261                 case FLX_CSTAT_INVALID:
7262                 case FLX_CSTAT_OKAY:
7263                         if (warn_user == 0 && bootverbose == 0)
7264                                 break;
7265                         printf("%s: %s Channel %s\n", ahd_name(ahd),
7266                                channel_strings[i], termstat_strings[term_stat]);
7267                         break;
7268                 }
7269         }
7270         if (warn_user) {
7271                 printf("%s: WARNING. Termination is not configured correctly.\n"
7272                        "%s: WARNING. SCSI bus operations may FAIL.\n",
7273                        ahd_name(ahd), ahd_name(ahd));
7274         }
7275 init_done:
7276         ahd_restart(ahd);
7277         ahd_timer_reset(&ahd->stat_timer, AHD_STAT_UPDATE_US,
7278                         ahd_stat_timer, ahd);
7279         return (0);
7280 }
7281
7282 /*
7283  * (Re)initialize chip state after a chip reset.
7284  */
7285 static void
7286 ahd_chip_init(struct ahd_softc *ahd)
7287 {
7288         uint32_t busaddr;
7289         u_int    sxfrctl1;
7290         u_int    scsiseq_template;
7291         u_int    wait;
7292         u_int    i;
7293         u_int    target;
7294
7295         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
7296         /*
7297          * Take the LED out of diagnostic mode
7298          */
7299         ahd_outb(ahd, SBLKCTL, ahd_inb(ahd, SBLKCTL) & ~(DIAGLEDEN|DIAGLEDON));
7300
7301         /*
7302          * Return HS_MAILBOX to its default value.
7303          */
7304         ahd->hs_mailbox = 0;
7305         ahd_outb(ahd, HS_MAILBOX, 0);
7306
7307         /* Set the SCSI Id, SXFRCTL0, SXFRCTL1, and SIMODE1. */
7308         ahd_outb(ahd, IOWNID, ahd->our_id);
7309         ahd_outb(ahd, TOWNID, ahd->our_id);
7310         sxfrctl1 = (ahd->flags & AHD_TERM_ENB_A) != 0 ? STPWEN : 0;
7311         sxfrctl1 |= (ahd->flags & AHD_SPCHK_ENB_A) != 0 ? ENSPCHK : 0;
7312         if ((ahd->bugs & AHD_LONG_SETIMO_BUG)
7313          && (ahd->seltime != STIMESEL_MIN)) {
7314                 /*
7315                  * The selection timer duration is twice as long
7316                  * as it should be.  Halve it by adding "1" to
7317                  * the user specified setting.
7318                  */
7319                 sxfrctl1 |= ahd->seltime + STIMESEL_BUG_ADJ;
7320         } else {
7321                 sxfrctl1 |= ahd->seltime;
7322         }
7323
7324         ahd_outb(ahd, SXFRCTL0, DFON);
7325         ahd_outb(ahd, SXFRCTL1, sxfrctl1|ahd->seltime|ENSTIMER|ACTNEGEN);
7326         ahd_outb(ahd, SIMODE1, ENSELTIMO|ENSCSIRST|ENSCSIPERR);
7327
7328         /*
7329          * Now that termination is set, wait for up
7330          * to 500ms for our transceivers to settle.  If
7331          * the adapter does not have a cable attached,
7332          * the transceivers may never settle, so don't
7333          * complain if we fail here.
7334          */
7335         for (wait = 10000;
7336              (ahd_inb(ahd, SBLKCTL) & (ENAB40|ENAB20)) == 0 && wait;
7337              wait--)
7338                 ahd_delay(100);
7339
7340         /* Clear any false bus resets due to the transceivers settling */
7341         ahd_outb(ahd, CLRSINT1, CLRSCSIRSTI);
7342         ahd_outb(ahd, CLRINT, CLRSCSIINT);
7343
7344         /* Initialize mode specific S/G state. */
7345         for (i = 0; i < 2; i++) {
7346                 ahd_set_modes(ahd, AHD_MODE_DFF0 + i, AHD_MODE_DFF0 + i);
7347                 ahd_outb(ahd, LONGJMP_ADDR + 1, INVALID_ADDR);
7348                 ahd_outb(ahd, SG_STATE, 0);
7349                 ahd_outb(ahd, CLRSEQINTSRC, 0xFF);
7350                 ahd_outb(ahd, SEQIMODE,
7351                          ENSAVEPTRS|ENCFG4DATA|ENCFG4ISTAT
7352                         |ENCFG4TSTAT|ENCFG4ICMD|ENCFG4TCMD);
7353         }
7354
7355         ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
7356         ahd_outb(ahd, DSCOMMAND0, ahd_inb(ahd, DSCOMMAND0)|MPARCKEN|CACHETHEN);
7357         ahd_outb(ahd, DFF_THRSH, RD_DFTHRSH_75|WR_DFTHRSH_75);
7358         ahd_outb(ahd, SIMODE0, ENIOERR|ENOVERRUN);
7359         ahd_outb(ahd, SIMODE3, ENNTRAMPERR|ENOSRAMPERR);
7360         if ((ahd->bugs & AHD_BUSFREEREV_BUG) != 0) {
7361                 ahd_outb(ahd, OPTIONMODE, AUTOACKEN|AUTO_MSGOUT_DE);
7362         } else {
7363                 ahd_outb(ahd, OPTIONMODE, AUTOACKEN|BUSFREEREV|AUTO_MSGOUT_DE);
7364         }
7365         ahd_outb(ahd, SCSCHKN, CURRFIFODEF|WIDERESEN|SHVALIDSTDIS);
7366         if ((ahd->chip & AHD_BUS_MASK) == AHD_PCIX)
7367                 /*
7368                  * Do not issue a target abort when a split completion
7369                  * error occurs.  Let our PCIX interrupt handler deal
7370                  * with it instead. H2A4 Razor #625
7371                  */
7372                 ahd_outb(ahd, PCIXCTL, ahd_inb(ahd, PCIXCTL) | SPLTSTADIS);
7373
7374         if ((ahd->bugs & AHD_LQOOVERRUN_BUG) != 0)
7375                 ahd_outb(ahd, LQOSCSCTL, LQONOCHKOVER);
7376
7377         /*
7378          * Tweak IOCELL settings.
7379          */
7380         if ((ahd->flags & AHD_HP_BOARD) != 0) {
7381                 for (i = 0; i < NUMDSPS; i++) {
7382                         ahd_outb(ahd, DSPSELECT, i);
7383                         ahd_outb(ahd, WRTBIASCTL, WRTBIASCTL_HP_DEFAULT);
7384                 }
7385 #ifdef AHD_DEBUG
7386                 if ((ahd_debug & AHD_SHOW_MISC) != 0)
7387                         printf("%s: WRTBIASCTL now 0x%x\n", ahd_name(ahd),
7388                                WRTBIASCTL_HP_DEFAULT);
7389 #endif
7390         }
7391         ahd_setup_iocell_workaround(ahd);
7392
7393         /*
7394          * Enable LQI Manager interrupts.
7395          */
7396         ahd_outb(ahd, LQIMODE1, ENLQIPHASE_LQ|ENLQIPHASE_NLQ|ENLIQABORT
7397                               | ENLQICRCI_LQ|ENLQICRCI_NLQ|ENLQIBADLQI
7398                               | ENLQIOVERI_LQ|ENLQIOVERI_NLQ);
7399         ahd_outb(ahd, LQOMODE0, ENLQOATNLQ|ENLQOATNPKT|ENLQOTCRC);
7400         /*
7401          * We choose to have the sequencer catch LQOPHCHGINPKT errors
7402          * manually for the command phase at the start of a packetized
7403          * selection case.  ENLQOBUSFREE should be made redundant by
7404          * the BUSFREE interrupt, but it seems that some LQOBUSFREE
7405          * events fail to assert the BUSFREE interrupt so we must
7406          * also enable LQOBUSFREE interrupts.
7407          */
7408         ahd_outb(ahd, LQOMODE1, ENLQOBUSFREE);
7409
7410         /*
7411          * Setup sequencer interrupt handlers.
7412          */
7413         ahd_outw(ahd, INTVEC1_ADDR, ahd_resolve_seqaddr(ahd, LABEL_seq_isr));
7414         ahd_outw(ahd, INTVEC2_ADDR, ahd_resolve_seqaddr(ahd, LABEL_timer_isr));
7415
7416         /*
7417          * Setup SCB Offset registers.
7418          */
7419         if ((ahd->bugs & AHD_PKT_LUN_BUG) != 0) {
7420                 ahd_outb(ahd, LUNPTR, offsetof(struct hardware_scb,
7421                          pkt_long_lun));
7422         } else {
7423                 ahd_outb(ahd, LUNPTR, offsetof(struct hardware_scb, lun));
7424         }
7425         ahd_outb(ahd, CMDLENPTR, offsetof(struct hardware_scb, cdb_len));
7426         ahd_outb(ahd, ATTRPTR, offsetof(struct hardware_scb, task_attribute));
7427         ahd_outb(ahd, FLAGPTR, offsetof(struct hardware_scb, task_management));
7428         ahd_outb(ahd, CMDPTR, offsetof(struct hardware_scb,
7429                                        shared_data.idata.cdb));
7430         ahd_outb(ahd, QNEXTPTR,
7431                  offsetof(struct hardware_scb, next_hscb_busaddr));
7432         ahd_outb(ahd, ABRTBITPTR, MK_MESSAGE_BIT_OFFSET);
7433         ahd_outb(ahd, ABRTBYTEPTR, offsetof(struct hardware_scb, control));
7434         if ((ahd->bugs & AHD_PKT_LUN_BUG) != 0) {
7435                 ahd_outb(ahd, LUNLEN,
7436                          sizeof(ahd->next_queued_hscb->pkt_long_lun) - 1);
7437         } else {
7438                 ahd_outb(ahd, LUNLEN, LUNLEN_SINGLE_LEVEL_LUN);
7439         }
7440         ahd_outb(ahd, CDBLIMIT, SCB_CDB_LEN_PTR - 1);
7441         ahd_outb(ahd, MAXCMD, 0xFF);
7442         ahd_outb(ahd, SCBAUTOPTR,
7443                  AUSCBPTR_EN | offsetof(struct hardware_scb, tag));
7444
7445         /* We haven't been enabled for target mode yet. */
7446         ahd_outb(ahd, MULTARGID, 0);
7447         ahd_outb(ahd, MULTARGID + 1, 0);
7448
7449         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
7450         /* Initialize the negotiation table. */
7451         if ((ahd->features & AHD_NEW_IOCELL_OPTS) == 0) {
7452                 /*
7453                  * Clear the spare bytes in the neg table to avoid
7454                  * spurious parity errors.
7455                  */
7456                 for (target = 0; target < AHD_NUM_TARGETS; target++) {
7457                         ahd_outb(ahd, NEGOADDR, target);
7458                         ahd_outb(ahd, ANNEXCOL, AHD_ANNEXCOL_PER_DEV0);
7459                         for (i = 0; i < AHD_NUM_PER_DEV_ANNEXCOLS; i++)
7460                                 ahd_outb(ahd, ANNEXDAT, 0);
7461                 }
7462         }
7463         for (target = 0; target < AHD_NUM_TARGETS; target++) {
7464                 struct   ahd_devinfo devinfo;
7465                 struct   ahd_initiator_tinfo *tinfo;
7466                 struct   ahd_tmode_tstate *tstate;
7467
7468                 tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
7469                                             target, &tstate);
7470                 ahd_compile_devinfo(&devinfo, ahd->our_id,
7471                                     target, CAM_LUN_WILDCARD,
7472                                     'A', ROLE_INITIATOR);
7473                 ahd_update_neg_table(ahd, &devinfo, &tinfo->curr);
7474         }
7475
7476         ahd_outb(ahd, CLRSINT3, NTRAMPERR|OSRAMPERR);
7477         ahd_outb(ahd, CLRINT, CLRSCSIINT);
7478
7479 #ifdef NEEDS_MORE_TESTING
7480         /*
7481          * Always enable abort on incoming L_Qs if this feature is
7482          * supported.  We use this to catch invalid SCB references.
7483          */
7484         if ((ahd->bugs & AHD_ABORT_LQI_BUG) == 0)
7485                 ahd_outb(ahd, LQCTL1, ABORTPENDING);
7486         else
7487 #endif
7488                 ahd_outb(ahd, LQCTL1, 0);
7489
7490         /* All of our queues are empty */
7491         ahd->qoutfifonext = 0;
7492         ahd->qoutfifonext_valid_tag = QOUTFIFO_ENTRY_VALID;
7493         ahd_outb(ahd, QOUTFIFO_ENTRY_VALID_TAG, QOUTFIFO_ENTRY_VALID);
7494         for (i = 0; i < AHD_QOUT_SIZE; i++)
7495                 ahd->qoutfifo[i].valid_tag = 0;
7496         ahd_sync_qoutfifo(ahd, BUS_DMASYNC_PREREAD);
7497
7498         ahd->qinfifonext = 0;
7499         for (i = 0; i < AHD_QIN_SIZE; i++)
7500                 ahd->qinfifo[i] = SCB_LIST_NULL;
7501
7502         if ((ahd->features & AHD_TARGETMODE) != 0) {
7503                 /* All target command blocks start out invalid. */
7504                 for (i = 0; i < AHD_TMODE_CMDS; i++)
7505                         ahd->targetcmds[i].cmd_valid = 0;
7506                 ahd_sync_tqinfifo(ahd, BUS_DMASYNC_PREREAD);
7507                 ahd->tqinfifonext = 1;
7508                 ahd_outb(ahd, KERNEL_TQINPOS, ahd->tqinfifonext - 1);
7509                 ahd_outb(ahd, TQINPOS, ahd->tqinfifonext);
7510         }
7511
7512         /* Initialize Scratch Ram. */
7513         ahd_outb(ahd, SEQ_FLAGS, 0);
7514         ahd_outb(ahd, SEQ_FLAGS2, 0);
7515
7516         /* We don't have any waiting selections */
7517         ahd_outw(ahd, WAITING_TID_HEAD, SCB_LIST_NULL);
7518         ahd_outw(ahd, WAITING_TID_TAIL, SCB_LIST_NULL);
7519         ahd_outw(ahd, MK_MESSAGE_SCB, SCB_LIST_NULL);
7520         ahd_outw(ahd, MK_MESSAGE_SCSIID, 0xFF);
7521         for (i = 0; i < AHD_NUM_TARGETS; i++)
7522                 ahd_outw(ahd, WAITING_SCB_TAILS + (2 * i), SCB_LIST_NULL);
7523
7524         /*
7525          * Nobody is waiting to be DMAed into the QOUTFIFO.
7526          */
7527         ahd_outw(ahd, COMPLETE_SCB_HEAD, SCB_LIST_NULL);
7528         ahd_outw(ahd, COMPLETE_SCB_DMAINPROG_HEAD, SCB_LIST_NULL);
7529         ahd_outw(ahd, COMPLETE_DMA_SCB_HEAD, SCB_LIST_NULL);
7530         ahd_outw(ahd, COMPLETE_DMA_SCB_TAIL, SCB_LIST_NULL);
7531         ahd_outw(ahd, COMPLETE_ON_QFREEZE_HEAD, SCB_LIST_NULL);
7532
7533         /*
7534          * The Freeze Count is 0.
7535          */
7536         ahd->qfreeze_cnt = 0;
7537         ahd_outw(ahd, QFREEZE_COUNT, 0);
7538         ahd_outw(ahd, KERNEL_QFREEZE_COUNT, 0);
7539
7540         /*
7541          * Tell the sequencer where it can find our arrays in memory.
7542          */
7543         busaddr = ahd->shared_data_map.physaddr;
7544         ahd_outl(ahd, SHARED_DATA_ADDR, busaddr);
7545         ahd_outl(ahd, QOUTFIFO_NEXT_ADDR, busaddr);
7546
7547         /*
7548          * Setup the allowed SCSI Sequences based on operational mode.
7549          * If we are a target, we'll enable select in operations once
7550          * we've had a lun enabled.
7551          */
7552         scsiseq_template = ENAUTOATNP;
7553         if ((ahd->flags & AHD_INITIATORROLE) != 0)
7554                 scsiseq_template |= ENRSELI;
7555         ahd_outb(ahd, SCSISEQ_TEMPLATE, scsiseq_template);
7556
7557         /* There are no busy SCBs yet. */
7558         for (target = 0; target < AHD_NUM_TARGETS; target++) {
7559                 int lun;
7560
7561                 for (lun = 0; lun < AHD_NUM_LUNS_NONPKT; lun++)
7562                         ahd_unbusy_tcl(ahd, BUILD_TCL_RAW(target, 'A', lun));
7563         }
7564
7565         /*
7566          * Initialize the group code to command length table.
7567          * Vendor Unique codes are set to 0 so we only capture
7568          * the first byte of the cdb.  These can be overridden
7569          * when target mode is enabled.
7570          */
7571         ahd_outb(ahd, CMDSIZE_TABLE, 5);
7572         ahd_outb(ahd, CMDSIZE_TABLE + 1, 9);
7573         ahd_outb(ahd, CMDSIZE_TABLE + 2, 9);
7574         ahd_outb(ahd, CMDSIZE_TABLE + 3, 0);
7575         ahd_outb(ahd, CMDSIZE_TABLE + 4, 15);
7576         ahd_outb(ahd, CMDSIZE_TABLE + 5, 11);
7577         ahd_outb(ahd, CMDSIZE_TABLE + 6, 0);
7578         ahd_outb(ahd, CMDSIZE_TABLE + 7, 0);
7579
7580         /* Tell the sequencer of our initial queue positions */
7581         ahd_set_modes(ahd, AHD_MODE_CCHAN, AHD_MODE_CCHAN);
7582         ahd_outb(ahd, QOFF_CTLSTA, SCB_QSIZE_512);
7583         ahd->qinfifonext = 0;
7584         ahd_set_hnscb_qoff(ahd, ahd->qinfifonext);
7585         ahd_set_hescb_qoff(ahd, 0);
7586         ahd_set_snscb_qoff(ahd, 0);
7587         ahd_set_sescb_qoff(ahd, 0);
7588         ahd_set_sdscb_qoff(ahd, 0);
7589
7590         /*
7591          * Tell the sequencer which SCB will be the next one it receives.
7592          */
7593         busaddr = ahd_le32toh(ahd->next_queued_hscb->hscb_busaddr);
7594         ahd_outl(ahd, NEXT_QUEUED_SCB_ADDR, busaddr);
7595
7596         /*
7597          * Default to coalescing disabled.
7598          */
7599         ahd_outw(ahd, INT_COALESCING_CMDCOUNT, 0);
7600         ahd_outw(ahd, CMDS_PENDING, 0);
7601         ahd_update_coalescing_values(ahd, ahd->int_coalescing_timer,
7602                                      ahd->int_coalescing_maxcmds,
7603                                      ahd->int_coalescing_mincmds);
7604         ahd_enable_coalescing(ahd, FALSE);
7605
7606         ahd_loadseq(ahd);
7607         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
7608
7609         if (ahd->features & AHD_AIC79XXB_SLOWCRC) {
7610                 u_int negodat3 = ahd_inb(ahd, NEGCONOPTS);
7611
7612                 negodat3 |= ENSLOWCRC;
7613                 ahd_outb(ahd, NEGCONOPTS, negodat3);
7614                 negodat3 = ahd_inb(ahd, NEGCONOPTS);
7615                 if (!(negodat3 & ENSLOWCRC))
7616                         printf("aic79xx: failed to set the SLOWCRC bit\n");
7617                 else
7618                         printf("aic79xx: SLOWCRC bit set\n");
7619         }
7620 }
7621
7622 /*
7623  * Setup default device and controller settings.
7624  * This should only be called if our probe has
7625  * determined that no configuration data is available.
7626  */
7627 int
7628 ahd_default_config(struct ahd_softc *ahd)
7629 {
7630         int     targ;
7631
7632         ahd->our_id = 7;
7633
7634         /*
7635          * Allocate a tstate to house information for our
7636          * initiator presence on the bus as well as the user
7637          * data for any target mode initiator.
7638          */
7639         if (ahd_alloc_tstate(ahd, ahd->our_id, 'A') == NULL) {
7640                 printf("%s: unable to allocate ahd_tmode_tstate.  "
7641                        "Failing attach\n", ahd_name(ahd));
7642                 return (ENOMEM);
7643         }
7644
7645         for (targ = 0; targ < AHD_NUM_TARGETS; targ++) {
7646                 struct   ahd_devinfo devinfo;
7647                 struct   ahd_initiator_tinfo *tinfo;
7648                 struct   ahd_tmode_tstate *tstate;
7649                 uint16_t target_mask;
7650
7651                 tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
7652                                             targ, &tstate);
7653                 /*
7654                  * We support SPC2 and SPI4.
7655                  */
7656                 tinfo->user.protocol_version = 4;
7657                 tinfo->user.transport_version = 4;
7658
7659                 target_mask = 0x01 << targ;
7660                 ahd->user_discenable |= target_mask;
7661                 tstate->discenable |= target_mask;
7662                 ahd->user_tagenable |= target_mask;
7663 #ifdef AHD_FORCE_160
7664                 tinfo->user.period = AHD_SYNCRATE_DT;
7665 #else
7666                 tinfo->user.period = AHD_SYNCRATE_160;
7667 #endif
7668                 tinfo->user.offset = MAX_OFFSET;
7669                 tinfo->user.ppr_options = MSG_EXT_PPR_RD_STRM
7670                                         | MSG_EXT_PPR_WR_FLOW
7671                                         | MSG_EXT_PPR_HOLD_MCS
7672                                         | MSG_EXT_PPR_IU_REQ
7673                                         | MSG_EXT_PPR_QAS_REQ
7674                                         | MSG_EXT_PPR_DT_REQ;
7675                 if ((ahd->features & AHD_RTI) != 0)
7676                         tinfo->user.ppr_options |= MSG_EXT_PPR_RTI;
7677
7678                 tinfo->user.width = MSG_EXT_WDTR_BUS_16_BIT;
7679
7680                 /*
7681                  * Start out Async/Narrow/Untagged and with
7682                  * conservative protocol support.
7683                  */
7684                 tinfo->goal.protocol_version = 2;
7685                 tinfo->goal.transport_version = 2;
7686                 tinfo->curr.protocol_version = 2;
7687                 tinfo->curr.transport_version = 2;
7688                 ahd_compile_devinfo(&devinfo, ahd->our_id,
7689                                     targ, CAM_LUN_WILDCARD,
7690                                     'A', ROLE_INITIATOR);
7691                 tstate->tagenable &= ~target_mask;
7692                 ahd_set_width(ahd, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
7693                               AHD_TRANS_CUR|AHD_TRANS_GOAL, /*paused*/TRUE);
7694                 ahd_set_syncrate(ahd, &devinfo, /*period*/0, /*offset*/0,
7695                                  /*ppr_options*/0, AHD_TRANS_CUR|AHD_TRANS_GOAL,
7696                                  /*paused*/TRUE);
7697         }
7698         return (0);
7699 }
7700
7701 /*
7702  * Parse device configuration information.
7703  */
7704 int
7705 ahd_parse_cfgdata(struct ahd_softc *ahd, struct seeprom_config *sc)
7706 {
7707         int targ;
7708         int max_targ;
7709
7710         max_targ = sc->max_targets & CFMAXTARG;
7711         ahd->our_id = sc->brtime_id & CFSCSIID;
7712
7713         /*
7714          * Allocate a tstate to house information for our
7715          * initiator presence on the bus as well as the user
7716          * data for any target mode initiator.
7717          */
7718         if (ahd_alloc_tstate(ahd, ahd->our_id, 'A') == NULL) {
7719                 printf("%s: unable to allocate ahd_tmode_tstate.  "
7720                        "Failing attach\n", ahd_name(ahd));
7721                 return (ENOMEM);
7722         }
7723
7724         for (targ = 0; targ < max_targ; targ++) {
7725                 struct   ahd_devinfo devinfo;
7726                 struct   ahd_initiator_tinfo *tinfo;
7727                 struct   ahd_transinfo *user_tinfo;
7728                 struct   ahd_tmode_tstate *tstate;
7729                 uint16_t target_mask;
7730
7731                 tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
7732                                             targ, &tstate);
7733                 user_tinfo = &tinfo->user;
7734
7735                 /*
7736                  * We support SPC2 and SPI4.
7737                  */
7738                 tinfo->user.protocol_version = 4;
7739                 tinfo->user.transport_version = 4;
7740
7741                 target_mask = 0x01 << targ;
7742                 ahd->user_discenable &= ~target_mask;
7743                 tstate->discenable &= ~target_mask;
7744                 ahd->user_tagenable &= ~target_mask;
7745                 if (sc->device_flags[targ] & CFDISC) {
7746                         tstate->discenable |= target_mask;
7747                         ahd->user_discenable |= target_mask;
7748                         ahd->user_tagenable |= target_mask;
7749                 } else {
7750                         /*
7751                          * Cannot be packetized without disconnection.
7752                          */
7753                         sc->device_flags[targ] &= ~CFPACKETIZED;
7754                 }
7755
7756                 user_tinfo->ppr_options = 0;
7757                 user_tinfo->period = (sc->device_flags[targ] & CFXFER);
7758                 if (user_tinfo->period < CFXFER_ASYNC) {
7759                         if (user_tinfo->period <= AHD_PERIOD_10MHz)
7760                                 user_tinfo->ppr_options |= MSG_EXT_PPR_DT_REQ;
7761                         user_tinfo->offset = MAX_OFFSET;
7762                 } else  {
7763                         user_tinfo->offset = 0;
7764                         user_tinfo->period = AHD_ASYNC_XFER_PERIOD;
7765                 }
7766 #ifdef AHD_FORCE_160
7767                 if (user_tinfo->period <= AHD_SYNCRATE_160)
7768                         user_tinfo->period = AHD_SYNCRATE_DT;
7769 #endif
7770
7771                 if ((sc->device_flags[targ] & CFPACKETIZED) != 0) {
7772                         user_tinfo->ppr_options |= MSG_EXT_PPR_RD_STRM
7773                                                 |  MSG_EXT_PPR_WR_FLOW
7774                                                 |  MSG_EXT_PPR_HOLD_MCS
7775                                                 |  MSG_EXT_PPR_IU_REQ;
7776                         if ((ahd->features & AHD_RTI) != 0)
7777                                 user_tinfo->ppr_options |= MSG_EXT_PPR_RTI;
7778                 }
7779
7780                 if ((sc->device_flags[targ] & CFQAS) != 0)
7781                         user_tinfo->ppr_options |= MSG_EXT_PPR_QAS_REQ;
7782
7783                 if ((sc->device_flags[targ] & CFWIDEB) != 0)
7784                         user_tinfo->width = MSG_EXT_WDTR_BUS_16_BIT;
7785                 else
7786                         user_tinfo->width = MSG_EXT_WDTR_BUS_8_BIT;
7787 #ifdef AHD_DEBUG
7788                 if ((ahd_debug & AHD_SHOW_MISC) != 0)
7789                         printf("(%d): %x:%x:%x:%x\n", targ, user_tinfo->width,
7790                                user_tinfo->period, user_tinfo->offset,
7791                                user_tinfo->ppr_options);
7792 #endif
7793                 /*
7794                  * Start out Async/Narrow/Untagged and with
7795                  * conservative protocol support.
7796                  */
7797                 tstate->tagenable &= ~target_mask;
7798                 tinfo->goal.protocol_version = 2;
7799                 tinfo->goal.transport_version = 2;
7800                 tinfo->curr.protocol_version = 2;
7801                 tinfo->curr.transport_version = 2;
7802                 ahd_compile_devinfo(&devinfo, ahd->our_id,
7803                                     targ, CAM_LUN_WILDCARD,
7804                                     'A', ROLE_INITIATOR);
7805                 ahd_set_width(ahd, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
7806                               AHD_TRANS_CUR|AHD_TRANS_GOAL, /*paused*/TRUE);
7807                 ahd_set_syncrate(ahd, &devinfo, /*period*/0, /*offset*/0,
7808                                  /*ppr_options*/0, AHD_TRANS_CUR|AHD_TRANS_GOAL,
7809                                  /*paused*/TRUE);
7810         }
7811
7812         ahd->flags &= ~AHD_SPCHK_ENB_A;
7813         if (sc->bios_control & CFSPARITY)
7814                 ahd->flags |= AHD_SPCHK_ENB_A;
7815
7816         ahd->flags &= ~AHD_RESET_BUS_A;
7817         if (sc->bios_control & CFRESETB)
7818                 ahd->flags |= AHD_RESET_BUS_A;
7819
7820         ahd->flags &= ~AHD_EXTENDED_TRANS_A;
7821         if (sc->bios_control & CFEXTEND)
7822                 ahd->flags |= AHD_EXTENDED_TRANS_A;
7823
7824         ahd->flags &= ~AHD_BIOS_ENABLED;
7825         if ((sc->bios_control & CFBIOSSTATE) == CFBS_ENABLED)
7826                 ahd->flags |= AHD_BIOS_ENABLED;
7827
7828         ahd->flags &= ~AHD_STPWLEVEL_A;
7829         if ((sc->adapter_control & CFSTPWLEVEL) != 0)
7830                 ahd->flags |= AHD_STPWLEVEL_A;
7831
7832         return (0);
7833 }
7834
7835 /*
7836  * Parse device configuration information.
7837  */
7838 int
7839 ahd_parse_vpddata(struct ahd_softc *ahd, struct vpd_config *vpd)
7840 {
7841         int error;
7842
7843         error = ahd_verify_vpd_cksum(vpd);
7844         if (error == 0)
7845                 return (EINVAL);
7846         if ((vpd->bios_flags & VPDBOOTHOST) != 0)
7847                 ahd->flags |= AHD_BOOT_CHANNEL;
7848         return (0);
7849 }
7850
7851 void
7852 ahd_intr_enable(struct ahd_softc *ahd, int enable)
7853 {
7854         u_int hcntrl;
7855
7856         hcntrl = ahd_inb(ahd, HCNTRL);
7857         hcntrl &= ~INTEN;
7858         ahd->pause &= ~INTEN;
7859         ahd->unpause &= ~INTEN;
7860         if (enable) {
7861                 hcntrl |= INTEN;
7862                 ahd->pause |= INTEN;
7863                 ahd->unpause |= INTEN;
7864         }
7865         ahd_outb(ahd, HCNTRL, hcntrl);
7866 }
7867
7868 static void
7869 ahd_update_coalescing_values(struct ahd_softc *ahd, u_int timer, u_int maxcmds,
7870                              u_int mincmds)
7871 {
7872         if (timer > AHD_TIMER_MAX_US)
7873                 timer = AHD_TIMER_MAX_US;
7874         ahd->int_coalescing_timer = timer;
7875
7876         if (maxcmds > AHD_INT_COALESCING_MAXCMDS_MAX)
7877                 maxcmds = AHD_INT_COALESCING_MAXCMDS_MAX;
7878         if (mincmds > AHD_INT_COALESCING_MINCMDS_MAX)
7879                 mincmds = AHD_INT_COALESCING_MINCMDS_MAX;
7880         ahd->int_coalescing_maxcmds = maxcmds;
7881         ahd_outw(ahd, INT_COALESCING_TIMER, timer / AHD_TIMER_US_PER_TICK);
7882         ahd_outb(ahd, INT_COALESCING_MAXCMDS, -maxcmds);
7883         ahd_outb(ahd, INT_COALESCING_MINCMDS, -mincmds);
7884 }
7885
7886 static void
7887 ahd_enable_coalescing(struct ahd_softc *ahd, int enable)
7888 {
7889
7890         ahd->hs_mailbox &= ~ENINT_COALESCE;
7891         if (enable)
7892                 ahd->hs_mailbox |= ENINT_COALESCE;
7893         ahd_outb(ahd, HS_MAILBOX, ahd->hs_mailbox);
7894         ahd_flush_device_writes(ahd);
7895         ahd_run_qoutfifo(ahd);
7896 }
7897
7898 /*
7899  * Ensure that the card is paused in a location
7900  * outside of all critical sections and that all
7901  * pending work is completed prior to returning.
7902  * This routine should only be called from outside
7903  * an interrupt context.
7904  */
7905 void
7906 ahd_pause_and_flushwork(struct ahd_softc *ahd)
7907 {
7908         u_int intstat;
7909         u_int maxloops;
7910
7911         maxloops = 1000;
7912         ahd->flags |= AHD_ALL_INTERRUPTS;
7913         ahd_pause(ahd);
7914         /*
7915          * Freeze the outgoing selections.  We do this only
7916          * until we are safely paused without further selections
7917          * pending.
7918          */
7919         ahd->qfreeze_cnt--;
7920         ahd_outw(ahd, KERNEL_QFREEZE_COUNT, ahd->qfreeze_cnt);
7921         ahd_outb(ahd, SEQ_FLAGS2, ahd_inb(ahd, SEQ_FLAGS2) | SELECTOUT_QFROZEN);
7922         do {
7923
7924                 ahd_unpause(ahd);
7925                 /*
7926                  * Give the sequencer some time to service
7927                  * any active selections.
7928                  */
7929                 ahd_delay(500);
7930
7931                 ahd_intr(ahd);
7932                 ahd_pause(ahd);
7933                 intstat = ahd_inb(ahd, INTSTAT);
7934                 if ((intstat & INT_PEND) == 0) {
7935                         ahd_clear_critical_section(ahd);
7936                         intstat = ahd_inb(ahd, INTSTAT);
7937                 }
7938         } while (--maxloops
7939               && (intstat != 0xFF || (ahd->features & AHD_REMOVABLE) == 0)
7940               && ((intstat & INT_PEND) != 0
7941                || (ahd_inb(ahd, SCSISEQ0) & ENSELO) != 0
7942                || (ahd_inb(ahd, SSTAT0) & (SELDO|SELINGO)) != 0));
7943
7944         if (maxloops == 0) {
7945                 printf("Infinite interrupt loop, INTSTAT = %x",
7946                       ahd_inb(ahd, INTSTAT));
7947         }
7948         ahd->qfreeze_cnt++;
7949         ahd_outw(ahd, KERNEL_QFREEZE_COUNT, ahd->qfreeze_cnt);
7950
7951         ahd_flush_qoutfifo(ahd);
7952
7953         ahd->flags &= ~AHD_ALL_INTERRUPTS;
7954 }
7955
7956 #ifdef CONFIG_PM
7957 int
7958 ahd_suspend(struct ahd_softc *ahd)
7959 {
7960
7961         ahd_pause_and_flushwork(ahd);
7962
7963         if (LIST_FIRST(&ahd->pending_scbs) != NULL) {
7964                 ahd_unpause(ahd);
7965                 return (EBUSY);
7966         }
7967         ahd_shutdown(ahd);
7968         return (0);
7969 }
7970
7971 void
7972 ahd_resume(struct ahd_softc *ahd)
7973 {
7974
7975         ahd_reset(ahd, /*reinit*/TRUE);
7976         ahd_intr_enable(ahd, TRUE);
7977         ahd_restart(ahd);
7978 }
7979 #endif
7980
7981 /************************** Busy Target Table *********************************/
7982 /*
7983  * Set SCBPTR to the SCB that contains the busy
7984  * table entry for TCL.  Return the offset into
7985  * the SCB that contains the entry for TCL.
7986  * saved_scbid is dereferenced and set to the
7987  * scbid that should be restored once manipualtion
7988  * of the TCL entry is complete.
7989  */
7990 static inline u_int
7991 ahd_index_busy_tcl(struct ahd_softc *ahd, u_int *saved_scbid, u_int tcl)
7992 {
7993         /*
7994          * Index to the SCB that contains the busy entry.
7995          */
7996         AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
7997         *saved_scbid = ahd_get_scbptr(ahd);
7998         ahd_set_scbptr(ahd, TCL_LUN(tcl)
7999                      | ((TCL_TARGET_OFFSET(tcl) & 0xC) << 4));
8000
8001         /*
8002          * And now calculate the SCB offset to the entry.
8003          * Each entry is 2 bytes wide, hence the
8004          * multiplication by 2.
8005          */
8006         return (((TCL_TARGET_OFFSET(tcl) & 0x3) << 1) + SCB_DISCONNECTED_LISTS);
8007 }
8008
8009 /*
8010  * Return the untagged transaction id for a given target/channel lun.
8011  */
8012 static u_int
8013 ahd_find_busy_tcl(struct ahd_softc *ahd, u_int tcl)
8014 {
8015         u_int scbid;
8016         u_int scb_offset;
8017         u_int saved_scbptr;
8018
8019         scb_offset = ahd_index_busy_tcl(ahd, &saved_scbptr, tcl);
8020         scbid = ahd_inw_scbram(ahd, scb_offset);
8021         ahd_set_scbptr(ahd, saved_scbptr);
8022         return (scbid);
8023 }
8024
8025 static void
8026 ahd_busy_tcl(struct ahd_softc *ahd, u_int tcl, u_int scbid)
8027 {
8028         u_int scb_offset;
8029         u_int saved_scbptr;
8030
8031         scb_offset = ahd_index_busy_tcl(ahd, &saved_scbptr, tcl);
8032         ahd_outw(ahd, scb_offset, scbid);
8033         ahd_set_scbptr(ahd, saved_scbptr);
8034 }
8035
8036 /************************** SCB and SCB queue management **********************/
8037 static int
8038 ahd_match_scb(struct ahd_softc *ahd, struct scb *scb, int target,
8039               char channel, int lun, u_int tag, role_t role)
8040 {
8041         int targ = SCB_GET_TARGET(ahd, scb);
8042         char chan = SCB_GET_CHANNEL(ahd, scb);
8043         int slun = SCB_GET_LUN(scb);
8044         int match;
8045
8046         match = ((chan == channel) || (channel == ALL_CHANNELS));
8047         if (match != 0)
8048                 match = ((targ == target) || (target == CAM_TARGET_WILDCARD));
8049         if (match != 0)
8050                 match = ((lun == slun) || (lun == CAM_LUN_WILDCARD));
8051         if (match != 0) {
8052 #ifdef AHD_TARGET_MODE
8053                 int group;
8054
8055                 group = XPT_FC_GROUP(scb->io_ctx->ccb_h.func_code);
8056                 if (role == ROLE_INITIATOR) {
8057                         match = (group != XPT_FC_GROUP_TMODE)
8058                               && ((tag == SCB_GET_TAG(scb))
8059                                || (tag == SCB_LIST_NULL));
8060                 } else if (role == ROLE_TARGET) {
8061                         match = (group == XPT_FC_GROUP_TMODE)
8062                               && ((tag == scb->io_ctx->csio.tag_id)
8063                                || (tag == SCB_LIST_NULL));
8064                 }
8065 #else /* !AHD_TARGET_MODE */
8066                 match = ((tag == SCB_GET_TAG(scb)) || (tag == SCB_LIST_NULL));
8067 #endif /* AHD_TARGET_MODE */
8068         }
8069
8070         return match;
8071 }
8072
8073 static void
8074 ahd_freeze_devq(struct ahd_softc *ahd, struct scb *scb)
8075 {
8076         int     target;
8077         char    channel;
8078         int     lun;
8079
8080         target = SCB_GET_TARGET(ahd, scb);
8081         lun = SCB_GET_LUN(scb);
8082         channel = SCB_GET_CHANNEL(ahd, scb);
8083
8084         ahd_search_qinfifo(ahd, target, channel, lun,
8085                            /*tag*/SCB_LIST_NULL, ROLE_UNKNOWN,
8086                            CAM_REQUEUE_REQ, SEARCH_COMPLETE);
8087
8088         ahd_platform_freeze_devq(ahd, scb);
8089 }
8090
8091 void
8092 ahd_qinfifo_requeue_tail(struct ahd_softc *ahd, struct scb *scb)
8093 {
8094         struct scb      *prev_scb;
8095         ahd_mode_state   saved_modes;
8096
8097         saved_modes = ahd_save_modes(ahd);
8098         ahd_set_modes(ahd, AHD_MODE_CCHAN, AHD_MODE_CCHAN);
8099         prev_scb = NULL;
8100         if (ahd_qinfifo_count(ahd) != 0) {
8101                 u_int prev_tag;
8102                 u_int prev_pos;
8103
8104                 prev_pos = AHD_QIN_WRAP(ahd->qinfifonext - 1);
8105                 prev_tag = ahd->qinfifo[prev_pos];
8106                 prev_scb = ahd_lookup_scb(ahd, prev_tag);
8107         }
8108         ahd_qinfifo_requeue(ahd, prev_scb, scb);
8109         ahd_set_hnscb_qoff(ahd, ahd->qinfifonext);
8110         ahd_restore_modes(ahd, saved_modes);
8111 }
8112
8113 static void
8114 ahd_qinfifo_requeue(struct ahd_softc *ahd, struct scb *prev_scb,
8115                     struct scb *scb)
8116 {
8117         if (prev_scb == NULL) {
8118                 uint32_t busaddr;
8119
8120                 busaddr = ahd_le32toh(scb->hscb->hscb_busaddr);
8121                 ahd_outl(ahd, NEXT_QUEUED_SCB_ADDR, busaddr);
8122         } else {
8123                 prev_scb->hscb->next_hscb_busaddr = scb->hscb->hscb_busaddr;
8124                 ahd_sync_scb(ahd, prev_scb,
8125                              BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
8126         }
8127         ahd->qinfifo[AHD_QIN_WRAP(ahd->qinfifonext)] = SCB_GET_TAG(scb);
8128         ahd->qinfifonext++;
8129         scb->hscb->next_hscb_busaddr = ahd->next_queued_hscb->hscb_busaddr;
8130         ahd_sync_scb(ahd, scb, BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
8131 }
8132
8133 static int
8134 ahd_qinfifo_count(struct ahd_softc *ahd)
8135 {
8136         u_int qinpos;
8137         u_int wrap_qinpos;
8138         u_int wrap_qinfifonext;
8139
8140         AHD_ASSERT_MODES(ahd, AHD_MODE_CCHAN_MSK, AHD_MODE_CCHAN_MSK);
8141         qinpos = ahd_get_snscb_qoff(ahd);
8142         wrap_qinpos = AHD_QIN_WRAP(qinpos);
8143         wrap_qinfifonext = AHD_QIN_WRAP(ahd->qinfifonext);
8144         if (wrap_qinfifonext >= wrap_qinpos)
8145                 return (wrap_qinfifonext - wrap_qinpos);
8146         else
8147                 return (wrap_qinfifonext
8148                       + ARRAY_SIZE(ahd->qinfifo) - wrap_qinpos);
8149 }
8150
8151 static void
8152 ahd_reset_cmds_pending(struct ahd_softc *ahd)
8153 {
8154         struct          scb *scb;
8155         ahd_mode_state  saved_modes;
8156         u_int           pending_cmds;
8157
8158         saved_modes = ahd_save_modes(ahd);
8159         ahd_set_modes(ahd, AHD_MODE_CCHAN, AHD_MODE_CCHAN);
8160
8161         /*
8162          * Don't count any commands as outstanding that the
8163          * sequencer has already marked for completion.
8164          */
8165         ahd_flush_qoutfifo(ahd);
8166
8167         pending_cmds = 0;
8168         LIST_FOREACH(scb, &ahd->pending_scbs, pending_links) {
8169                 pending_cmds++;
8170         }
8171         ahd_outw(ahd, CMDS_PENDING, pending_cmds - ahd_qinfifo_count(ahd));
8172         ahd_restore_modes(ahd, saved_modes);
8173         ahd->flags &= ~AHD_UPDATE_PEND_CMDS;
8174 }
8175
8176 static void
8177 ahd_done_with_status(struct ahd_softc *ahd, struct scb *scb, uint32_t status)
8178 {
8179         cam_status ostat;
8180         cam_status cstat;
8181
8182         ostat = ahd_get_transaction_status(scb);
8183         if (ostat == CAM_REQ_INPROG)
8184                 ahd_set_transaction_status(scb, status);
8185         cstat = ahd_get_transaction_status(scb);
8186         if (cstat != CAM_REQ_CMP)
8187                 ahd_freeze_scb(scb);
8188         ahd_done(ahd, scb);
8189 }
8190
8191 int
8192 ahd_search_qinfifo(struct ahd_softc *ahd, int target, char channel,
8193                    int lun, u_int tag, role_t role, uint32_t status,
8194                    ahd_search_action action)
8195 {
8196         struct scb      *scb;
8197         struct scb      *mk_msg_scb;
8198         struct scb      *prev_scb;
8199         ahd_mode_state   saved_modes;
8200         u_int            qinstart;
8201         u_int            qinpos;
8202         u_int            qintail;
8203         u_int            tid_next;
8204         u_int            tid_prev;
8205         u_int            scbid;
8206         u_int            seq_flags2;
8207         u_int            savedscbptr;
8208         uint32_t         busaddr;
8209         int              found;
8210         int              targets;
8211
8212         /* Must be in CCHAN mode */
8213         saved_modes = ahd_save_modes(ahd);
8214         ahd_set_modes(ahd, AHD_MODE_CCHAN, AHD_MODE_CCHAN);
8215
8216         /*
8217          * Halt any pending SCB DMA.  The sequencer will reinitiate
8218          * this dma if the qinfifo is not empty once we unpause.
8219          */
8220         if ((ahd_inb(ahd, CCSCBCTL) & (CCARREN|CCSCBEN|CCSCBDIR))
8221          == (CCARREN|CCSCBEN|CCSCBDIR)) {
8222                 ahd_outb(ahd, CCSCBCTL,
8223                          ahd_inb(ahd, CCSCBCTL) & ~(CCARREN|CCSCBEN));
8224                 while ((ahd_inb(ahd, CCSCBCTL) & (CCARREN|CCSCBEN)) != 0)
8225                         ;
8226         }
8227         /* Determine sequencer's position in the qinfifo. */
8228         qintail = AHD_QIN_WRAP(ahd->qinfifonext);
8229         qinstart = ahd_get_snscb_qoff(ahd);
8230         qinpos = AHD_QIN_WRAP(qinstart);
8231         found = 0;
8232         prev_scb = NULL;
8233
8234         if (action == SEARCH_PRINT) {
8235                 printf("qinstart = %d qinfifonext = %d\nQINFIFO:",
8236                        qinstart, ahd->qinfifonext);
8237         }
8238
8239         /*
8240          * Start with an empty queue.  Entries that are not chosen
8241          * for removal will be re-added to the queue as we go.
8242          */
8243         ahd->qinfifonext = qinstart;
8244         busaddr = ahd_le32toh(ahd->next_queued_hscb->hscb_busaddr);
8245         ahd_outl(ahd, NEXT_QUEUED_SCB_ADDR, busaddr);
8246
8247         while (qinpos != qintail) {
8248                 scb = ahd_lookup_scb(ahd, ahd->qinfifo[qinpos]);
8249                 if (scb == NULL) {
8250                         printf("qinpos = %d, SCB index = %d\n",
8251                                 qinpos, ahd->qinfifo[qinpos]);
8252                         panic("Loop 1\n");
8253                 }
8254
8255                 if (ahd_match_scb(ahd, scb, target, channel, lun, tag, role)) {
8256                         /*
8257                          * We found an scb that needs to be acted on.
8258                          */
8259                         found++;
8260                         switch (action) {
8261                         case SEARCH_COMPLETE:
8262                                 if ((scb->flags & SCB_ACTIVE) == 0)
8263                                         printf("Inactive SCB in qinfifo\n");
8264                                 ahd_done_with_status(ahd, scb, status);
8265                                 /* FALLTHROUGH */
8266                         case SEARCH_REMOVE:
8267                                 break;
8268                         case SEARCH_PRINT:
8269                                 printf(" 0x%x", ahd->qinfifo[qinpos]);
8270                                 /* FALLTHROUGH */
8271                         case SEARCH_COUNT:
8272                                 ahd_qinfifo_requeue(ahd, prev_scb, scb);
8273                                 prev_scb = scb;
8274                                 break;
8275                         }
8276                 } else {
8277                         ahd_qinfifo_requeue(ahd, prev_scb, scb);
8278                         prev_scb = scb;
8279                 }
8280                 qinpos = AHD_QIN_WRAP(qinpos+1);
8281         }
8282
8283         ahd_set_hnscb_qoff(ahd, ahd->qinfifonext);
8284
8285         if (action == SEARCH_PRINT)
8286                 printf("\nWAITING_TID_QUEUES:\n");
8287
8288         /*
8289          * Search waiting for selection lists.  We traverse the
8290          * list of "their ids" waiting for selection and, if
8291          * appropriate, traverse the SCBs of each "their id"
8292          * looking for matches.
8293          */
8294         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
8295         seq_flags2 = ahd_inb(ahd, SEQ_FLAGS2);
8296         if ((seq_flags2 & PENDING_MK_MESSAGE) != 0) {
8297                 scbid = ahd_inw(ahd, MK_MESSAGE_SCB);
8298                 mk_msg_scb = ahd_lookup_scb(ahd, scbid);
8299         } else
8300                 mk_msg_scb = NULL;
8301         savedscbptr = ahd_get_scbptr(ahd);
8302         tid_next = ahd_inw(ahd, WAITING_TID_HEAD);
8303         tid_prev = SCB_LIST_NULL;
8304         targets = 0;
8305         for (scbid = tid_next; !SCBID_IS_NULL(scbid); scbid = tid_next) {
8306                 u_int tid_head;
8307                 u_int tid_tail;
8308
8309                 targets++;
8310                 if (targets > AHD_NUM_TARGETS)
8311                         panic("TID LIST LOOP");
8312
8313                 if (scbid >= ahd->scb_data.numscbs) {
8314                         printf("%s: Waiting TID List inconsistency. "
8315                                "SCB index == 0x%x, yet numscbs == 0x%x.",
8316                                ahd_name(ahd), scbid, ahd->scb_data.numscbs);
8317                         ahd_dump_card_state(ahd);
8318                         panic("for safety");
8319                 }
8320                 scb = ahd_lookup_scb(ahd, scbid);
8321                 if (scb == NULL) {
8322                         printf("%s: SCB = 0x%x Not Active!\n",
8323                                ahd_name(ahd), scbid);
8324                         panic("Waiting TID List traversal\n");
8325                 }
8326                 ahd_set_scbptr(ahd, scbid);
8327                 tid_next = ahd_inw_scbram(ahd, SCB_NEXT2);
8328                 if (ahd_match_scb(ahd, scb, target, channel, CAM_LUN_WILDCARD,
8329                                   SCB_LIST_NULL, ROLE_UNKNOWN) == 0) {
8330                         tid_prev = scbid;
8331                         continue;
8332                 }
8333
8334                 /*
8335                  * We found a list of scbs that needs to be searched.
8336                  */
8337                 if (action == SEARCH_PRINT)
8338                         printf("       %d ( ", SCB_GET_TARGET(ahd, scb));
8339                 tid_head = scbid;
8340                 found += ahd_search_scb_list(ahd, target, channel,
8341                                              lun, tag, role, status,
8342                                              action, &tid_head, &tid_tail,
8343                                              SCB_GET_TARGET(ahd, scb));
8344                 /*
8345                  * Check any MK_MESSAGE SCB that is still waiting to
8346                  * enter this target's waiting for selection queue.
8347                  */
8348                 if (mk_msg_scb != NULL
8349                  && ahd_match_scb(ahd, mk_msg_scb, target, channel,
8350                                   lun, tag, role)) {
8351
8352                         /*
8353                          * We found an scb that needs to be acted on.
8354                          */
8355                         found++;
8356                         switch (action) {
8357                         case SEARCH_COMPLETE:
8358                                 if ((mk_msg_scb->flags & SCB_ACTIVE) == 0)
8359                                         printf("Inactive SCB pending MK_MSG\n");
8360                                 ahd_done_with_status(ahd, mk_msg_scb, status);
8361                                 /* FALLTHROUGH */
8362                         case SEARCH_REMOVE:
8363                         {
8364                                 u_int tail_offset;
8365
8366                                 printf("Removing MK_MSG scb\n");
8367
8368                                 /*
8369                                  * Reset our tail to the tail of the
8370                                  * main per-target list.
8371                                  */
8372                                 tail_offset = WAITING_SCB_TAILS
8373                                     + (2 * SCB_GET_TARGET(ahd, mk_msg_scb));
8374                                 ahd_outw(ahd, tail_offset, tid_tail);
8375
8376                                 seq_flags2 &= ~PENDING_MK_MESSAGE;
8377                                 ahd_outb(ahd, SEQ_FLAGS2, seq_flags2);
8378                                 ahd_outw(ahd, CMDS_PENDING,
8379                                          ahd_inw(ahd, CMDS_PENDING)-1);
8380                                 mk_msg_scb = NULL;
8381                                 break;
8382                         }
8383                         case SEARCH_PRINT:
8384                                 printf(" 0x%x", SCB_GET_TAG(scb));
8385                                 /* FALLTHROUGH */
8386                         case SEARCH_COUNT:
8387                                 break;
8388                         }
8389                 }
8390
8391                 if (mk_msg_scb != NULL
8392                  && SCBID_IS_NULL(tid_head)
8393                  && ahd_match_scb(ahd, scb, target, channel, CAM_LUN_WILDCARD,
8394                                   SCB_LIST_NULL, ROLE_UNKNOWN)) {
8395
8396                         /*
8397                          * When removing the last SCB for a target
8398                          * queue with a pending MK_MESSAGE scb, we
8399                          * must queue the MK_MESSAGE scb.
8400                          */
8401                         printf("Queueing mk_msg_scb\n");
8402                         tid_head = ahd_inw(ahd, MK_MESSAGE_SCB);
8403                         seq_flags2 &= ~PENDING_MK_MESSAGE;
8404                         ahd_outb(ahd, SEQ_FLAGS2, seq_flags2);
8405                         mk_msg_scb = NULL;
8406                 }
8407                 if (tid_head != scbid)
8408                         ahd_stitch_tid_list(ahd, tid_prev, tid_head, tid_next);
8409                 if (!SCBID_IS_NULL(tid_head))
8410                         tid_prev = tid_head;
8411                 if (action == SEARCH_PRINT)
8412                         printf(")\n");
8413         }
8414
8415         /* Restore saved state. */
8416         ahd_set_scbptr(ahd, savedscbptr);
8417         ahd_restore_modes(ahd, saved_modes);
8418         return (found);
8419 }
8420
8421 static int
8422 ahd_search_scb_list(struct ahd_softc *ahd, int target, char channel,
8423                     int lun, u_int tag, role_t role, uint32_t status,
8424                     ahd_search_action action, u_int *list_head,
8425                     u_int *list_tail, u_int tid)
8426 {
8427         struct  scb *scb;
8428         u_int   scbid;
8429         u_int   next;
8430         u_int   prev;
8431         int     found;
8432
8433         AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
8434         found = 0;
8435         prev = SCB_LIST_NULL;
8436         next = *list_head;
8437         *list_tail = SCB_LIST_NULL;
8438         for (scbid = next; !SCBID_IS_NULL(scbid); scbid = next) {
8439                 if (scbid >= ahd->scb_data.numscbs) {
8440                         printf("%s:SCB List inconsistency. "
8441                                "SCB == 0x%x, yet numscbs == 0x%x.",
8442                                ahd_name(ahd), scbid, ahd->scb_data.numscbs);
8443                         ahd_dump_card_state(ahd);
8444                         panic("for safety");
8445                 }
8446                 scb = ahd_lookup_scb(ahd, scbid);
8447                 if (scb == NULL) {
8448                         printf("%s: SCB = %d Not Active!\n",
8449                                ahd_name(ahd), scbid);
8450                         panic("Waiting List traversal\n");
8451                 }
8452                 ahd_set_scbptr(ahd, scbid);
8453                 *list_tail = scbid;
8454                 next = ahd_inw_scbram(ahd, SCB_NEXT);
8455                 if (ahd_match_scb(ahd, scb, target, channel,
8456                                   lun, SCB_LIST_NULL, role) == 0) {
8457                         prev = scbid;
8458                         continue;
8459                 }
8460                 found++;
8461                 switch (action) {
8462                 case SEARCH_COMPLETE:
8463                         if ((scb->flags & SCB_ACTIVE) == 0)
8464                                 printf("Inactive SCB in Waiting List\n");
8465                         ahd_done_with_status(ahd, scb, status);
8466                         /* FALLTHROUGH */
8467                 case SEARCH_REMOVE:
8468                         ahd_rem_wscb(ahd, scbid, prev, next, tid);
8469                         *list_tail = prev;
8470                         if (SCBID_IS_NULL(prev))
8471                                 *list_head = next;
8472                         break;
8473                 case SEARCH_PRINT:
8474                         printf("0x%x ", scbid);
8475                 case SEARCH_COUNT:
8476                         prev = scbid;
8477                         break;
8478                 }
8479                 if (found > AHD_SCB_MAX)
8480                         panic("SCB LIST LOOP");
8481         }
8482         if (action == SEARCH_COMPLETE
8483          || action == SEARCH_REMOVE)
8484                 ahd_outw(ahd, CMDS_PENDING, ahd_inw(ahd, CMDS_PENDING) - found);
8485         return (found);
8486 }
8487
8488 static void
8489 ahd_stitch_tid_list(struct ahd_softc *ahd, u_int tid_prev,
8490                     u_int tid_cur, u_int tid_next)
8491 {
8492         AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
8493
8494         if (SCBID_IS_NULL(tid_cur)) {
8495
8496                 /* Bypass current TID list */
8497                 if (SCBID_IS_NULL(tid_prev)) {
8498                         ahd_outw(ahd, WAITING_TID_HEAD, tid_next);
8499                 } else {
8500                         ahd_set_scbptr(ahd, tid_prev);
8501                         ahd_outw(ahd, SCB_NEXT2, tid_next);
8502                 }
8503                 if (SCBID_IS_NULL(tid_next))
8504                         ahd_outw(ahd, WAITING_TID_TAIL, tid_prev);
8505         } else {
8506
8507                 /* Stitch through tid_cur */
8508                 if (SCBID_IS_NULL(tid_prev)) {
8509                         ahd_outw(ahd, WAITING_TID_HEAD, tid_cur);
8510                 } else {
8511                         ahd_set_scbptr(ahd, tid_prev);
8512                         ahd_outw(ahd, SCB_NEXT2, tid_cur);
8513                 }
8514                 ahd_set_scbptr(ahd, tid_cur);
8515                 ahd_outw(ahd, SCB_NEXT2, tid_next);
8516
8517                 if (SCBID_IS_NULL(tid_next))
8518                         ahd_outw(ahd, WAITING_TID_TAIL, tid_cur);
8519         }
8520 }
8521
8522 /*
8523  * Manipulate the waiting for selection list and return the
8524  * scb that follows the one that we remove.
8525  */
8526 static u_int
8527 ahd_rem_wscb(struct ahd_softc *ahd, u_int scbid,
8528              u_int prev, u_int next, u_int tid)
8529 {
8530         u_int tail_offset;
8531
8532         AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
8533         if (!SCBID_IS_NULL(prev)) {
8534                 ahd_set_scbptr(ahd, prev);
8535                 ahd_outw(ahd, SCB_NEXT, next);
8536         }
8537
8538         /*
8539          * SCBs that have MK_MESSAGE set in them may
8540          * cause the tail pointer to be updated without
8541          * setting the next pointer of the previous tail.
8542          * Only clear the tail if the removed SCB was
8543          * the tail.
8544          */
8545         tail_offset = WAITING_SCB_TAILS + (2 * tid);
8546         if (SCBID_IS_NULL(next)
8547          && ahd_inw(ahd, tail_offset) == scbid)
8548                 ahd_outw(ahd, tail_offset, prev);
8549
8550         ahd_add_scb_to_free_list(ahd, scbid);
8551         return (next);
8552 }
8553
8554 /*
8555  * Add the SCB as selected by SCBPTR onto the on chip list of
8556  * free hardware SCBs.  This list is empty/unused if we are not
8557  * performing SCB paging.
8558  */
8559 static void
8560 ahd_add_scb_to_free_list(struct ahd_softc *ahd, u_int scbid)
8561 {
8562 /* XXX Need some other mechanism to designate "free". */
8563         /*
8564          * Invalidate the tag so that our abort
8565          * routines don't think it's active.
8566         ahd_outb(ahd, SCB_TAG, SCB_LIST_NULL);
8567          */
8568 }
8569
8570 /******************************** Error Handling ******************************/
8571 /*
8572  * Abort all SCBs that match the given description (target/channel/lun/tag),
8573  * setting their status to the passed in status if the status has not already
8574  * been modified from CAM_REQ_INPROG.  This routine assumes that the sequencer
8575  * is paused before it is called.
8576  */
8577 static int
8578 ahd_abort_scbs(struct ahd_softc *ahd, int target, char channel,
8579                int lun, u_int tag, role_t role, uint32_t status)
8580 {
8581         struct          scb *scbp;
8582         struct          scb *scbp_next;
8583         u_int           i, j;
8584         u_int           maxtarget;
8585         u_int           minlun;
8586         u_int           maxlun;
8587         int             found;
8588         ahd_mode_state  saved_modes;
8589
8590         /* restore this when we're done */
8591         saved_modes = ahd_save_modes(ahd);
8592         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
8593
8594         found = ahd_search_qinfifo(ahd, target, channel, lun, SCB_LIST_NULL,
8595                                    role, CAM_REQUEUE_REQ, SEARCH_COMPLETE);
8596
8597         /*
8598          * Clean out the busy target table for any untagged commands.
8599          */
8600         i = 0;
8601         maxtarget = 16;
8602         if (target != CAM_TARGET_WILDCARD) {
8603                 i = target;
8604                 if (channel == 'B')
8605                         i += 8;
8606                 maxtarget = i + 1;
8607         }
8608
8609         if (lun == CAM_LUN_WILDCARD) {
8610                 minlun = 0;
8611                 maxlun = AHD_NUM_LUNS_NONPKT;
8612         } else if (lun >= AHD_NUM_LUNS_NONPKT) {
8613                 minlun = maxlun = 0;
8614         } else {
8615                 minlun = lun;
8616                 maxlun = lun + 1;
8617         }
8618
8619         if (role != ROLE_TARGET) {
8620                 for (;i < maxtarget; i++) {
8621                         for (j = minlun;j < maxlun; j++) {
8622                                 u_int scbid;
8623                                 u_int tcl;
8624
8625                                 tcl = BUILD_TCL_RAW(i, 'A', j);
8626                                 scbid = ahd_find_busy_tcl(ahd, tcl);
8627                                 scbp = ahd_lookup_scb(ahd, scbid);
8628                                 if (scbp == NULL
8629                                  || ahd_match_scb(ahd, scbp, target, channel,
8630                                                   lun, tag, role) == 0)
8631                                         continue;
8632                                 ahd_unbusy_tcl(ahd, BUILD_TCL_RAW(i, 'A', j));
8633                         }
8634                 }
8635         }
8636
8637         /*
8638          * Don't abort commands that have already completed,
8639          * but haven't quite made it up to the host yet.
8640          */
8641         ahd_flush_qoutfifo(ahd);
8642
8643         /*
8644          * Go through the pending CCB list and look for
8645          * commands for this target that are still active.
8646          * These are other tagged commands that were
8647          * disconnected when the reset occurred.
8648          */
8649         scbp_next = LIST_FIRST(&ahd->pending_scbs);
8650         while (scbp_next != NULL) {
8651                 scbp = scbp_next;
8652                 scbp_next = LIST_NEXT(scbp, pending_links);
8653                 if (ahd_match_scb(ahd, scbp, target, channel, lun, tag, role)) {
8654                         cam_status ostat;
8655
8656                         ostat = ahd_get_transaction_status(scbp);
8657                         if (ostat == CAM_REQ_INPROG)
8658                                 ahd_set_transaction_status(scbp, status);
8659                         if (ahd_get_transaction_status(scbp) != CAM_REQ_CMP)
8660                                 ahd_freeze_scb(scbp);
8661                         if ((scbp->flags & SCB_ACTIVE) == 0)
8662                                 printf("Inactive SCB on pending list\n");
8663                         ahd_done(ahd, scbp);
8664                         found++;
8665                 }
8666         }
8667         ahd_restore_modes(ahd, saved_modes);
8668         ahd_platform_abort_scbs(ahd, target, channel, lun, tag, role, status);
8669         ahd->flags |= AHD_UPDATE_PEND_CMDS;
8670         return found;
8671 }
8672
8673 static void
8674 ahd_reset_current_bus(struct ahd_softc *ahd)
8675 {
8676         uint8_t scsiseq;
8677
8678         AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
8679         ahd_outb(ahd, SIMODE1, ahd_inb(ahd, SIMODE1) & ~ENSCSIRST);
8680         scsiseq = ahd_inb(ahd, SCSISEQ0) & ~(ENSELO|ENARBO|SCSIRSTO);
8681         ahd_outb(ahd, SCSISEQ0, scsiseq | SCSIRSTO);
8682         ahd_flush_device_writes(ahd);
8683         ahd_delay(AHD_BUSRESET_DELAY);
8684         /* Turn off the bus reset */
8685         ahd_outb(ahd, SCSISEQ0, scsiseq);
8686         ahd_flush_device_writes(ahd);
8687         ahd_delay(AHD_BUSRESET_DELAY);
8688         if ((ahd->bugs & AHD_SCSIRST_BUG) != 0) {
8689                 /*
8690                  * 2A Razor #474
8691                  * Certain chip state is not cleared for
8692                  * SCSI bus resets that we initiate, so
8693                  * we must reset the chip.
8694                  */
8695                 ahd_reset(ahd, /*reinit*/TRUE);
8696                 ahd_intr_enable(ahd, /*enable*/TRUE);
8697                 AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
8698         }
8699
8700         ahd_clear_intstat(ahd);
8701 }
8702
8703 int
8704 ahd_reset_channel(struct ahd_softc *ahd, char channel, int initiate_reset)
8705 {
8706         struct  ahd_devinfo caminfo;
8707         u_int   initiator;
8708         u_int   target;
8709         u_int   max_scsiid;
8710         int     found;
8711         u_int   fifo;
8712         u_int   next_fifo;
8713         uint8_t scsiseq;
8714
8715         /*
8716          * Check if the last bus reset is cleared
8717          */
8718         if (ahd->flags & AHD_BUS_RESET_ACTIVE) {
8719                 printf("%s: bus reset still active\n",
8720                        ahd_name(ahd));
8721                 return 0;
8722         }
8723         ahd->flags |= AHD_BUS_RESET_ACTIVE;
8724
8725         ahd->pending_device = NULL;
8726
8727         ahd_compile_devinfo(&caminfo,
8728                             CAM_TARGET_WILDCARD,
8729                             CAM_TARGET_WILDCARD,
8730                             CAM_LUN_WILDCARD,
8731                             channel, ROLE_UNKNOWN);
8732         ahd_pause(ahd);
8733
8734         /* Make sure the sequencer is in a safe location. */
8735         ahd_clear_critical_section(ahd);
8736
8737         /*
8738          * Run our command complete fifos to ensure that we perform
8739          * completion processing on any commands that 'completed'
8740          * before the reset occurred.
8741          */
8742         ahd_run_qoutfifo(ahd);
8743 #ifdef AHD_TARGET_MODE
8744         if ((ahd->flags & AHD_TARGETROLE) != 0) {
8745                 ahd_run_tqinfifo(ahd, /*paused*/TRUE);
8746         }
8747 #endif
8748         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
8749
8750         /*
8751          * Disable selections so no automatic hardware
8752          * functions will modify chip state.
8753          */
8754         ahd_outb(ahd, SCSISEQ0, 0);
8755         ahd_outb(ahd, SCSISEQ1, 0);
8756
8757         /*
8758          * Safely shut down our DMA engines.  Always start with
8759          * the FIFO that is not currently active (if any are
8760          * actively connected).
8761          */
8762         next_fifo = fifo = ahd_inb(ahd, DFFSTAT) & CURRFIFO;
8763         if (next_fifo > CURRFIFO_1)
8764                 /* If disconneced, arbitrarily start with FIFO1. */
8765                 next_fifo = fifo = 0;
8766         do {
8767                 next_fifo ^= CURRFIFO_1;
8768                 ahd_set_modes(ahd, next_fifo, next_fifo);
8769                 ahd_outb(ahd, DFCNTRL,
8770                          ahd_inb(ahd, DFCNTRL) & ~(SCSIEN|HDMAEN));
8771                 while ((ahd_inb(ahd, DFCNTRL) & HDMAENACK) != 0)
8772                         ahd_delay(10);
8773                 /*
8774                  * Set CURRFIFO to the now inactive channel.
8775                  */
8776                 ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
8777                 ahd_outb(ahd, DFFSTAT, next_fifo);
8778         } while (next_fifo != fifo);
8779
8780         /*
8781          * Reset the bus if we are initiating this reset
8782          */
8783         ahd_clear_msg_state(ahd);
8784         ahd_outb(ahd, SIMODE1,
8785                  ahd_inb(ahd, SIMODE1) & ~(ENBUSFREE|ENSCSIRST));
8786
8787         if (initiate_reset)
8788                 ahd_reset_current_bus(ahd);
8789
8790         ahd_clear_intstat(ahd);
8791
8792         /*
8793          * Clean up all the state information for the
8794          * pending transactions on this bus.
8795          */
8796         found = ahd_abort_scbs(ahd, CAM_TARGET_WILDCARD, channel,
8797                                CAM_LUN_WILDCARD, SCB_LIST_NULL,
8798                                ROLE_UNKNOWN, CAM_SCSI_BUS_RESET);
8799
8800         /*
8801          * Cleanup anything left in the FIFOs.
8802          */
8803         ahd_clear_fifo(ahd, 0);
8804         ahd_clear_fifo(ahd, 1);
8805
8806         /*
8807          * Clear SCSI interrupt status
8808          */
8809         ahd_outb(ahd, CLRSINT1, CLRSCSIRSTI);
8810
8811         /*
8812          * Reenable selections
8813          */
8814         ahd_outb(ahd, SIMODE1, ahd_inb(ahd, SIMODE1) | ENSCSIRST);
8815         scsiseq = ahd_inb(ahd, SCSISEQ_TEMPLATE);
8816         ahd_outb(ahd, SCSISEQ1, scsiseq & (ENSELI|ENRSELI|ENAUTOATNP));
8817
8818         max_scsiid = (ahd->features & AHD_WIDE) ? 15 : 7;
8819 #ifdef AHD_TARGET_MODE
8820         /*
8821          * Send an immediate notify ccb to all target more peripheral
8822          * drivers affected by this action.
8823          */
8824         for (target = 0; target <= max_scsiid; target++) {
8825                 struct ahd_tmode_tstate* tstate;
8826                 u_int lun;
8827
8828                 tstate = ahd->enabled_targets[target];
8829                 if (tstate == NULL)
8830                         continue;
8831                 for (lun = 0; lun < AHD_NUM_LUNS; lun++) {
8832                         struct ahd_tmode_lstate* lstate;
8833
8834                         lstate = tstate->enabled_luns[lun];
8835                         if (lstate == NULL)
8836                                 continue;
8837
8838                         ahd_queue_lstate_event(ahd, lstate, CAM_TARGET_WILDCARD,
8839                                                EVENT_TYPE_BUS_RESET, /*arg*/0);
8840                         ahd_send_lstate_events(ahd, lstate);
8841                 }
8842         }
8843 #endif
8844         /*
8845          * Revert to async/narrow transfers until we renegotiate.
8846          */
8847         for (target = 0; target <= max_scsiid; target++) {
8848
8849                 if (ahd->enabled_targets[target] == NULL)
8850                         continue;
8851                 for (initiator = 0; initiator <= max_scsiid; initiator++) {
8852                         struct ahd_devinfo devinfo;
8853
8854                         ahd_compile_devinfo(&devinfo, target, initiator,
8855                                             CAM_LUN_WILDCARD,
8856                                             'A', ROLE_UNKNOWN);
8857                         ahd_set_width(ahd, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
8858                                       AHD_TRANS_CUR, /*paused*/TRUE);
8859                         ahd_set_syncrate(ahd, &devinfo, /*period*/0,
8860                                          /*offset*/0, /*ppr_options*/0,
8861                                          AHD_TRANS_CUR, /*paused*/TRUE);
8862                 }
8863         }
8864
8865         /* Notify the XPT that a bus reset occurred */
8866         ahd_send_async(ahd, caminfo.channel, CAM_TARGET_WILDCARD,
8867                        CAM_LUN_WILDCARD, AC_BUS_RESET);
8868
8869         ahd_restart(ahd);
8870
8871         return (found);
8872 }
8873
8874 /**************************** Statistics Processing ***************************/
8875 static void
8876 ahd_stat_timer(void *arg)
8877 {
8878         struct  ahd_softc *ahd = arg;
8879         u_long  s;
8880         int     enint_coal;
8881
8882         ahd_lock(ahd, &s);
8883
8884         enint_coal = ahd->hs_mailbox & ENINT_COALESCE;
8885         if (ahd->cmdcmplt_total > ahd->int_coalescing_threshold)
8886                 enint_coal |= ENINT_COALESCE;
8887         else if (ahd->cmdcmplt_total < ahd->int_coalescing_stop_threshold)
8888                 enint_coal &= ~ENINT_COALESCE;
8889
8890         if (enint_coal != (ahd->hs_mailbox & ENINT_COALESCE)) {
8891                 ahd_enable_coalescing(ahd, enint_coal);
8892 #ifdef AHD_DEBUG
8893                 if ((ahd_debug & AHD_SHOW_INT_COALESCING) != 0)
8894                         printf("%s: Interrupt coalescing "
8895                                "now %sabled. Cmds %d\n",
8896                                ahd_name(ahd),
8897                                (enint_coal & ENINT_COALESCE) ? "en" : "dis",
8898                                ahd->cmdcmplt_total);
8899 #endif
8900         }
8901
8902         ahd->cmdcmplt_bucket = (ahd->cmdcmplt_bucket+1) & (AHD_STAT_BUCKETS-1);
8903         ahd->cmdcmplt_total -= ahd->cmdcmplt_counts[ahd->cmdcmplt_bucket];
8904         ahd->cmdcmplt_counts[ahd->cmdcmplt_bucket] = 0;
8905         ahd_timer_reset(&ahd->stat_timer, AHD_STAT_UPDATE_US,
8906                         ahd_stat_timer, ahd);
8907         ahd_unlock(ahd, &s);
8908 }
8909
8910 /****************************** Status Processing *****************************/
8911
8912 static void
8913 ahd_handle_scsi_status(struct ahd_softc *ahd, struct scb *scb)
8914 {
8915         struct  hardware_scb *hscb;
8916         int     paused;
8917
8918         /*
8919          * The sequencer freezes its select-out queue
8920          * anytime a SCSI status error occurs.  We must
8921          * handle the error and increment our qfreeze count
8922          * to allow the sequencer to continue.  We don't
8923          * bother clearing critical sections here since all
8924          * operations are on data structures that the sequencer
8925          * is not touching once the queue is frozen.
8926          */
8927         hscb = scb->hscb;
8928
8929         if (ahd_is_paused(ahd)) {
8930                 paused = 1;
8931         } else {
8932                 paused = 0;
8933                 ahd_pause(ahd);
8934         }
8935
8936         /* Freeze the queue until the client sees the error. */
8937         ahd_freeze_devq(ahd, scb);
8938         ahd_freeze_scb(scb);
8939         ahd->qfreeze_cnt++;
8940         ahd_outw(ahd, KERNEL_QFREEZE_COUNT, ahd->qfreeze_cnt);
8941
8942         if (paused == 0)
8943                 ahd_unpause(ahd);
8944
8945         /* Don't want to clobber the original sense code */
8946         if ((scb->flags & SCB_SENSE) != 0) {
8947                 /*
8948                  * Clear the SCB_SENSE Flag and perform
8949                  * a normal command completion.
8950                  */
8951                 scb->flags &= ~SCB_SENSE;
8952                 ahd_set_transaction_status(scb, CAM_AUTOSENSE_FAIL);
8953                 ahd_done(ahd, scb);
8954                 return;
8955         }
8956         ahd_set_transaction_status(scb, CAM_SCSI_STATUS_ERROR);
8957         ahd_set_scsi_status(scb, hscb->shared_data.istatus.scsi_status);
8958         switch (hscb->shared_data.istatus.scsi_status) {
8959         case STATUS_PKT_SENSE:
8960         {
8961                 struct scsi_status_iu_header *siu;
8962
8963                 ahd_sync_sense(ahd, scb, BUS_DMASYNC_POSTREAD);
8964                 siu = (struct scsi_status_iu_header *)scb->sense_data;
8965                 ahd_set_scsi_status(scb, siu->status);
8966 #ifdef AHD_DEBUG
8967                 if ((ahd_debug & AHD_SHOW_SENSE) != 0) {
8968                         ahd_print_path(ahd, scb);
8969                         printf("SCB 0x%x Received PKT Status of 0x%x\n",
8970                                SCB_GET_TAG(scb), siu->status);
8971                         printf("\tflags = 0x%x, sense len = 0x%x, "
8972                                "pktfail = 0x%x\n",
8973                                siu->flags, scsi_4btoul(siu->sense_length),
8974                                scsi_4btoul(siu->pkt_failures_length));
8975                 }
8976 #endif
8977                 if ((siu->flags & SIU_RSPVALID) != 0) {
8978                         ahd_print_path(ahd, scb);
8979                         if (scsi_4btoul(siu->pkt_failures_length) < 4) {
8980                                 printf("Unable to parse pkt_failures\n");
8981                         } else {
8982
8983                                 switch (SIU_PKTFAIL_CODE(siu)) {
8984                                 case SIU_PFC_NONE:
8985                                         printf("No packet failure found\n");
8986                                         break;
8987                                 case SIU_PFC_CIU_FIELDS_INVALID:
8988                                         printf("Invalid Command IU Field\n");
8989                                         break;
8990                                 case SIU_PFC_TMF_NOT_SUPPORTED:
8991                                         printf("TMF not supportd\n");
8992                                         break;
8993                                 case SIU_PFC_TMF_FAILED:
8994                                         printf("TMF failed\n");
8995                                         break;
8996                                 case SIU_PFC_INVALID_TYPE_CODE:
8997                                         printf("Invalid L_Q Type code\n");
8998                                         break;
8999                                 case SIU_PFC_ILLEGAL_REQUEST:
9000                                         printf("Illegal request\n");
9001                                 default:
9002                                         break;
9003                                 }
9004                         }
9005                         if (siu->status == SCSI_STATUS_OK)
9006                                 ahd_set_transaction_status(scb,
9007                                                            CAM_REQ_CMP_ERR);
9008                 }
9009                 if ((siu->flags & SIU_SNSVALID) != 0) {
9010                         scb->flags |= SCB_PKT_SENSE;
9011 #ifdef AHD_DEBUG
9012                         if ((ahd_debug & AHD_SHOW_SENSE) != 0)
9013                                 printf("Sense data available\n");
9014 #endif
9015                 }
9016                 ahd_done(ahd, scb);
9017                 break;
9018         }
9019         case SCSI_STATUS_CMD_TERMINATED:
9020         case SCSI_STATUS_CHECK_COND:
9021         {
9022                 struct ahd_devinfo devinfo;
9023                 struct ahd_dma_seg *sg;
9024                 struct scsi_sense *sc;
9025                 struct ahd_initiator_tinfo *targ_info;
9026                 struct ahd_tmode_tstate *tstate;
9027                 struct ahd_transinfo *tinfo;
9028 #ifdef AHD_DEBUG
9029                 if (ahd_debug & AHD_SHOW_SENSE) {
9030                         ahd_print_path(ahd, scb);
9031                         printf("SCB %d: requests Check Status\n",
9032                                SCB_GET_TAG(scb));
9033                 }
9034 #endif
9035
9036                 if (ahd_perform_autosense(scb) == 0)
9037                         break;
9038
9039                 ahd_compile_devinfo(&devinfo, SCB_GET_OUR_ID(scb),
9040                                     SCB_GET_TARGET(ahd, scb),
9041                                     SCB_GET_LUN(scb),
9042                                     SCB_GET_CHANNEL(ahd, scb),
9043                                     ROLE_INITIATOR);
9044                 targ_info = ahd_fetch_transinfo(ahd,
9045                                                 devinfo.channel,
9046                                                 devinfo.our_scsiid,
9047                                                 devinfo.target,
9048                                                 &tstate);
9049                 tinfo = &targ_info->curr;
9050                 sg = scb->sg_list;
9051                 sc = (struct scsi_sense *)hscb->shared_data.idata.cdb;
9052                 /*
9053                  * Save off the residual if there is one.
9054                  */
9055                 ahd_update_residual(ahd, scb);
9056 #ifdef AHD_DEBUG
9057                 if (ahd_debug & AHD_SHOW_SENSE) {
9058                         ahd_print_path(ahd, scb);
9059                         printf("Sending Sense\n");
9060                 }
9061 #endif
9062                 scb->sg_count = 0;
9063                 sg = ahd_sg_setup(ahd, scb, sg, ahd_get_sense_bufaddr(ahd, scb),
9064                                   ahd_get_sense_bufsize(ahd, scb),
9065                                   /*last*/TRUE);
9066                 sc->opcode = REQUEST_SENSE;
9067                 sc->byte2 = 0;
9068                 if (tinfo->protocol_version <= SCSI_REV_2
9069                  && SCB_GET_LUN(scb) < 8)
9070                         sc->byte2 = SCB_GET_LUN(scb) << 5;
9071                 sc->unused[0] = 0;
9072                 sc->unused[1] = 0;
9073                 sc->length = ahd_get_sense_bufsize(ahd, scb);
9074                 sc->control = 0;
9075
9076                 /*
9077                  * We can't allow the target to disconnect.
9078                  * This will be an untagged transaction and
9079                  * having the target disconnect will make this
9080                  * transaction indestinguishable from outstanding
9081                  * tagged transactions.
9082                  */
9083                 hscb->control = 0;
9084
9085                 /*
9086                  * This request sense could be because the
9087                  * the device lost power or in some other
9088                  * way has lost our transfer negotiations.
9089                  * Renegotiate if appropriate.  Unit attention
9090                  * errors will be reported before any data
9091                  * phases occur.
9092                  */
9093                 if (ahd_get_residual(scb) == ahd_get_transfer_length(scb)) {
9094                         ahd_update_neg_request(ahd, &devinfo,
9095                                                tstate, targ_info,
9096                                                AHD_NEG_IF_NON_ASYNC);
9097                 }
9098                 if (tstate->auto_negotiate & devinfo.target_mask) {
9099                         hscb->control |= MK_MESSAGE;
9100                         scb->flags &=
9101                             ~(SCB_NEGOTIATE|SCB_ABORT|SCB_DEVICE_RESET);
9102                         scb->flags |= SCB_AUTO_NEGOTIATE;
9103                 }
9104                 hscb->cdb_len = sizeof(*sc);
9105                 ahd_setup_data_scb(ahd, scb);
9106                 scb->flags |= SCB_SENSE;
9107                 ahd_queue_scb(ahd, scb);
9108                 break;
9109         }
9110         case SCSI_STATUS_OK:
9111                 printf("%s: Interrupted for staus of 0???\n",
9112                        ahd_name(ahd));
9113                 /* FALLTHROUGH */
9114         default:
9115                 ahd_done(ahd, scb);
9116                 break;
9117         }
9118 }
9119
9120 static void
9121 ahd_handle_scb_status(struct ahd_softc *ahd, struct scb *scb)
9122 {
9123         if (scb->hscb->shared_data.istatus.scsi_status != 0) {
9124                 ahd_handle_scsi_status(ahd, scb);
9125         } else {
9126                 ahd_calc_residual(ahd, scb);
9127                 ahd_done(ahd, scb);
9128         }
9129 }
9130
9131 /*
9132  * Calculate the residual for a just completed SCB.
9133  */
9134 static void
9135 ahd_calc_residual(struct ahd_softc *ahd, struct scb *scb)
9136 {
9137         struct hardware_scb *hscb;
9138         struct initiator_status *spkt;
9139         uint32_t sgptr;
9140         uint32_t resid_sgptr;
9141         uint32_t resid;
9142
9143         /*
9144          * 5 cases.
9145          * 1) No residual.
9146          *    SG_STATUS_VALID clear in sgptr.
9147          * 2) Transferless command
9148          * 3) Never performed any transfers.
9149          *    sgptr has SG_FULL_RESID set.
9150          * 4) No residual but target did not
9151          *    save data pointers after the
9152          *    last transfer, so sgptr was
9153          *    never updated.
9154          * 5) We have a partial residual.
9155          *    Use residual_sgptr to determine
9156          *    where we are.
9157          */
9158
9159         hscb = scb->hscb;
9160         sgptr = ahd_le32toh(hscb->sgptr);
9161         if ((sgptr & SG_STATUS_VALID) == 0)
9162                 /* Case 1 */
9163                 return;
9164         sgptr &= ~SG_STATUS_VALID;
9165
9166         if ((sgptr & SG_LIST_NULL) != 0)
9167                 /* Case 2 */
9168                 return;
9169
9170         /*
9171          * Residual fields are the same in both
9172          * target and initiator status packets,
9173          * so we can always use the initiator fields
9174          * regardless of the role for this SCB.
9175          */
9176         spkt = &hscb->shared_data.istatus;
9177         resid_sgptr = ahd_le32toh(spkt->residual_sgptr);
9178         if ((sgptr & SG_FULL_RESID) != 0) {
9179                 /* Case 3 */
9180                 resid = ahd_get_transfer_length(scb);
9181         } else if ((resid_sgptr & SG_LIST_NULL) != 0) {
9182                 /* Case 4 */
9183                 return;
9184         } else if ((resid_sgptr & SG_OVERRUN_RESID) != 0) {
9185                 ahd_print_path(ahd, scb);
9186                 printf("data overrun detected Tag == 0x%x.\n",
9187                        SCB_GET_TAG(scb));
9188                 ahd_freeze_devq(ahd, scb);
9189                 ahd_set_transaction_status(scb, CAM_DATA_RUN_ERR);
9190                 ahd_freeze_scb(scb);
9191                 return;
9192         } else if ((resid_sgptr & ~SG_PTR_MASK) != 0) {
9193                 panic("Bogus resid sgptr value 0x%x\n", resid_sgptr);
9194                 /* NOTREACHED */
9195         } else {
9196                 struct ahd_dma_seg *sg;
9197
9198                 /*
9199                  * Remainder of the SG where the transfer
9200                  * stopped.
9201                  */
9202                 resid = ahd_le32toh(spkt->residual_datacnt) & AHD_SG_LEN_MASK;
9203                 sg = ahd_sg_bus_to_virt(ahd, scb, resid_sgptr & SG_PTR_MASK);
9204
9205                 /* The residual sg_ptr always points to the next sg */
9206                 sg--;
9207
9208                 /*
9209                  * Add up the contents of all residual
9210                  * SG segments that are after the SG where
9211                  * the transfer stopped.
9212                  */
9213                 while ((ahd_le32toh(sg->len) & AHD_DMA_LAST_SEG) == 0) {
9214                         sg++;
9215                         resid += ahd_le32toh(sg->len) & AHD_SG_LEN_MASK;
9216                 }
9217         }
9218         if ((scb->flags & SCB_SENSE) == 0)
9219                 ahd_set_residual(scb, resid);
9220         else
9221                 ahd_set_sense_residual(scb, resid);
9222
9223 #ifdef AHD_DEBUG
9224         if ((ahd_debug & AHD_SHOW_MISC) != 0) {
9225                 ahd_print_path(ahd, scb);
9226                 printf("Handled %sResidual of %d bytes\n",
9227                        (scb->flags & SCB_SENSE) ? "Sense " : "", resid);
9228         }
9229 #endif
9230 }
9231
9232 /******************************* Target Mode **********************************/
9233 #ifdef AHD_TARGET_MODE
9234 /*
9235  * Add a target mode event to this lun's queue
9236  */
9237 static void
9238 ahd_queue_lstate_event(struct ahd_softc *ahd, struct ahd_tmode_lstate *lstate,
9239                        u_int initiator_id, u_int event_type, u_int event_arg)
9240 {
9241         struct ahd_tmode_event *event;
9242         int pending;
9243
9244         xpt_freeze_devq(lstate->path, /*count*/1);
9245         if (lstate->event_w_idx >= lstate->event_r_idx)
9246                 pending = lstate->event_w_idx - lstate->event_r_idx;
9247         else
9248                 pending = AHD_TMODE_EVENT_BUFFER_SIZE + 1
9249                         - (lstate->event_r_idx - lstate->event_w_idx);
9250
9251         if (event_type == EVENT_TYPE_BUS_RESET
9252          || event_type == MSG_BUS_DEV_RESET) {
9253                 /*
9254                  * Any earlier events are irrelevant, so reset our buffer.
9255                  * This has the effect of allowing us to deal with reset
9256                  * floods (an external device holding down the reset line)
9257                  * without losing the event that is really interesting.
9258                  */
9259                 lstate->event_r_idx = 0;
9260                 lstate->event_w_idx = 0;
9261                 xpt_release_devq(lstate->path, pending, /*runqueue*/FALSE);
9262         }
9263
9264         if (pending == AHD_TMODE_EVENT_BUFFER_SIZE) {
9265                 xpt_print_path(lstate->path);
9266                 printf("immediate event %x:%x lost\n",
9267                        lstate->event_buffer[lstate->event_r_idx].event_type,
9268                        lstate->event_buffer[lstate->event_r_idx].event_arg);
9269                 lstate->event_r_idx++;
9270                 if (lstate->event_r_idx == AHD_TMODE_EVENT_BUFFER_SIZE)
9271                         lstate->event_r_idx = 0;
9272                 xpt_release_devq(lstate->path, /*count*/1, /*runqueue*/FALSE);
9273         }
9274
9275         event = &lstate->event_buffer[lstate->event_w_idx];
9276         event->initiator_id = initiator_id;
9277         event->event_type = event_type;
9278         event->event_arg = event_arg;
9279         lstate->event_w_idx++;
9280         if (lstate->event_w_idx == AHD_TMODE_EVENT_BUFFER_SIZE)
9281                 lstate->event_w_idx = 0;
9282 }
9283
9284 /*
9285  * Send any target mode events queued up waiting
9286  * for immediate notify resources.
9287  */
9288 void
9289 ahd_send_lstate_events(struct ahd_softc *ahd, struct ahd_tmode_lstate *lstate)
9290 {
9291         struct ccb_hdr *ccbh;
9292         struct ccb_immed_notify *inot;
9293
9294         while (lstate->event_r_idx != lstate->event_w_idx
9295             && (ccbh = SLIST_FIRST(&lstate->immed_notifies)) != NULL) {
9296                 struct ahd_tmode_event *event;
9297
9298                 event = &lstate->event_buffer[lstate->event_r_idx];
9299                 SLIST_REMOVE_HEAD(&lstate->immed_notifies, sim_links.sle);
9300                 inot = (struct ccb_immed_notify *)ccbh;
9301                 switch (event->event_type) {
9302                 case EVENT_TYPE_BUS_RESET:
9303                         ccbh->status = CAM_SCSI_BUS_RESET|CAM_DEV_QFRZN;
9304                         break;
9305                 default:
9306                         ccbh->status = CAM_MESSAGE_RECV|CAM_DEV_QFRZN;
9307                         inot->message_args[0] = event->event_type;
9308                         inot->message_args[1] = event->event_arg;
9309                         break;
9310                 }
9311                 inot->initiator_id = event->initiator_id;
9312                 inot->sense_len = 0;
9313                 xpt_done((union ccb *)inot);
9314                 lstate->event_r_idx++;
9315                 if (lstate->event_r_idx == AHD_TMODE_EVENT_BUFFER_SIZE)
9316                         lstate->event_r_idx = 0;
9317         }
9318 }
9319 #endif
9320
9321 /******************** Sequencer Program Patching/Download *********************/
9322
9323 #ifdef AHD_DUMP_SEQ
9324 void
9325 ahd_dumpseq(struct ahd_softc* ahd)
9326 {
9327         int i;
9328         int max_prog;
9329
9330         max_prog = 2048;
9331
9332         ahd_outb(ahd, SEQCTL0, PERRORDIS|FAILDIS|FASTMODE|LOADRAM);
9333         ahd_outw(ahd, PRGMCNT, 0);
9334         for (i = 0; i < max_prog; i++) {
9335                 uint8_t ins_bytes[4];
9336
9337                 ahd_insb(ahd, SEQRAM, ins_bytes, 4);
9338                 printf("0x%08x\n", ins_bytes[0] << 24
9339                                  | ins_bytes[1] << 16
9340                                  | ins_bytes[2] << 8
9341                                  | ins_bytes[3]);
9342         }
9343 }
9344 #endif
9345
9346 static void
9347 ahd_loadseq(struct ahd_softc *ahd)
9348 {
9349         struct  cs cs_table[num_critical_sections];
9350         u_int   begin_set[num_critical_sections];
9351         u_int   end_set[num_critical_sections];
9352         const struct patch *cur_patch;
9353         u_int   cs_count;
9354         u_int   cur_cs;
9355         u_int   i;
9356         int     downloaded;
9357         u_int   skip_addr;
9358         u_int   sg_prefetch_cnt;
9359         u_int   sg_prefetch_cnt_limit;
9360         u_int   sg_prefetch_align;
9361         u_int   sg_size;
9362         u_int   cacheline_mask;
9363         uint8_t download_consts[DOWNLOAD_CONST_COUNT];
9364
9365         if (bootverbose)
9366                 printf("%s: Downloading Sequencer Program...",
9367                        ahd_name(ahd));
9368
9369 #if DOWNLOAD_CONST_COUNT != 8
9370 #error "Download Const Mismatch"
9371 #endif
9372         /*
9373          * Start out with 0 critical sections
9374          * that apply to this firmware load.
9375          */
9376         cs_count = 0;
9377         cur_cs = 0;
9378         memset(begin_set, 0, sizeof(begin_set));
9379         memset(end_set, 0, sizeof(end_set));
9380
9381         /*
9382          * Setup downloadable constant table.
9383          *
9384          * The computation for the S/G prefetch variables is
9385          * a bit complicated.  We would like to always fetch
9386          * in terms of cachelined sized increments.  However,
9387          * if the cacheline is not an even multiple of the
9388          * SG element size or is larger than our SG RAM, using
9389          * just the cache size might leave us with only a portion
9390          * of an SG element at the tail of a prefetch.  If the
9391          * cacheline is larger than our S/G prefetch buffer less
9392          * the size of an SG element, we may round down to a cacheline
9393          * that doesn't contain any or all of the S/G of interest
9394          * within the bounds of our S/G ram.  Provide variables to
9395          * the sequencer that will allow it to handle these edge
9396          * cases.
9397          */
9398         /* Start by aligning to the nearest cacheline. */
9399         sg_prefetch_align = ahd->pci_cachesize;
9400         if (sg_prefetch_align == 0)
9401                 sg_prefetch_align = 8;
9402         /* Round down to the nearest power of 2. */
9403         while (powerof2(sg_prefetch_align) == 0)
9404                 sg_prefetch_align--;
9405
9406         cacheline_mask = sg_prefetch_align - 1;
9407
9408         /*
9409          * If the cacheline boundary is greater than half our prefetch RAM
9410          * we risk not being able to fetch even a single complete S/G
9411          * segment if we align to that boundary.
9412          */
9413         if (sg_prefetch_align > CCSGADDR_MAX/2)
9414                 sg_prefetch_align = CCSGADDR_MAX/2;
9415         /* Start by fetching a single cacheline. */
9416         sg_prefetch_cnt = sg_prefetch_align;
9417         /*
9418          * Increment the prefetch count by cachelines until
9419          * at least one S/G element will fit.
9420          */
9421         sg_size = sizeof(struct ahd_dma_seg);
9422         if ((ahd->flags & AHD_64BIT_ADDRESSING) != 0)
9423                 sg_size = sizeof(struct ahd_dma64_seg);
9424         while (sg_prefetch_cnt < sg_size)
9425                 sg_prefetch_cnt += sg_prefetch_align;
9426         /*
9427          * If the cacheline is not an even multiple of
9428          * the S/G size, we may only get a partial S/G when
9429          * we align. Add a cacheline if this is the case.
9430          */
9431         if ((sg_prefetch_align % sg_size) != 0
9432          && (sg_prefetch_cnt < CCSGADDR_MAX))
9433                 sg_prefetch_cnt += sg_prefetch_align;
9434         /*
9435          * Lastly, compute a value that the sequencer can use
9436          * to determine if the remainder of the CCSGRAM buffer
9437          * has a full S/G element in it.
9438          */
9439         sg_prefetch_cnt_limit = -(sg_prefetch_cnt - sg_size + 1);
9440         download_consts[SG_PREFETCH_CNT] = sg_prefetch_cnt;
9441         download_consts[SG_PREFETCH_CNT_LIMIT] = sg_prefetch_cnt_limit;
9442         download_consts[SG_PREFETCH_ALIGN_MASK] = ~(sg_prefetch_align - 1);
9443         download_consts[SG_PREFETCH_ADDR_MASK] = (sg_prefetch_align - 1);
9444         download_consts[SG_SIZEOF] = sg_size;
9445         download_consts[PKT_OVERRUN_BUFOFFSET] =
9446                 (ahd->overrun_buf - (uint8_t *)ahd->qoutfifo) / 256;
9447         download_consts[SCB_TRANSFER_SIZE] = SCB_TRANSFER_SIZE_1BYTE_LUN;
9448         download_consts[CACHELINE_MASK] = cacheline_mask;
9449         cur_patch = patches;
9450         downloaded = 0;
9451         skip_addr = 0;
9452         ahd_outb(ahd, SEQCTL0, PERRORDIS|FAILDIS|FASTMODE|LOADRAM);
9453         ahd_outw(ahd, PRGMCNT, 0);
9454
9455         for (i = 0; i < sizeof(seqprog)/4; i++) {
9456                 if (ahd_check_patch(ahd, &cur_patch, i, &skip_addr) == 0) {
9457                         /*
9458                          * Don't download this instruction as it
9459                          * is in a patch that was removed.
9460                          */
9461                         continue;
9462                 }
9463                 /*
9464                  * Move through the CS table until we find a CS
9465                  * that might apply to this instruction.
9466                  */
9467                 for (; cur_cs < num_critical_sections; cur_cs++) {
9468                         if (critical_sections[cur_cs].end <= i) {
9469                                 if (begin_set[cs_count] == TRUE
9470                                  && end_set[cs_count] == FALSE) {
9471                                         cs_table[cs_count].end = downloaded;
9472                                         end_set[cs_count] = TRUE;
9473                                         cs_count++;
9474                                 }
9475                                 continue;
9476                         }
9477                         if (critical_sections[cur_cs].begin <= i
9478                          && begin_set[cs_count] == FALSE) {
9479                                 cs_table[cs_count].begin = downloaded;
9480                                 begin_set[cs_count] = TRUE;
9481                         }
9482                         break;
9483                 }
9484                 ahd_download_instr(ahd, i, download_consts);
9485                 downloaded++;
9486         }
9487
9488         ahd->num_critical_sections = cs_count;
9489         if (cs_count != 0) {
9490
9491                 cs_count *= sizeof(struct cs);
9492                 ahd->critical_sections = malloc(cs_count, M_DEVBUF, M_NOWAIT);
9493                 if (ahd->critical_sections == NULL)
9494                         panic("ahd_loadseq: Could not malloc");
9495                 memcpy(ahd->critical_sections, cs_table, cs_count);
9496         }
9497         ahd_outb(ahd, SEQCTL0, PERRORDIS|FAILDIS|FASTMODE);
9498
9499         if (bootverbose) {
9500                 printf(" %d instructions downloaded\n", downloaded);
9501                 printf("%s: Features 0x%x, Bugs 0x%x, Flags 0x%x\n",
9502                        ahd_name(ahd), ahd->features, ahd->bugs, ahd->flags);
9503         }
9504 }
9505
9506 static int
9507 ahd_check_patch(struct ahd_softc *ahd, const struct patch **start_patch,
9508                 u_int start_instr, u_int *skip_addr)
9509 {
9510         const struct patch *cur_patch;
9511         const struct patch *last_patch;
9512         u_int   num_patches;
9513
9514         num_patches = ARRAY_SIZE(patches);
9515         last_patch = &patches[num_patches];
9516         cur_patch = *start_patch;
9517
9518         while (cur_patch < last_patch && start_instr == cur_patch->begin) {
9519
9520                 if (cur_patch->patch_func(ahd) == 0) {
9521
9522                         /* Start rejecting code */
9523                         *skip_addr = start_instr + cur_patch->skip_instr;
9524                         cur_patch += cur_patch->skip_patch;
9525                 } else {
9526                         /* Accepted this patch.  Advance to the next
9527                          * one and wait for our intruction pointer to
9528                          * hit this point.
9529                          */
9530                         cur_patch++;
9531                 }
9532         }
9533
9534         *start_patch = cur_patch;
9535         if (start_instr < *skip_addr)
9536                 /* Still skipping */
9537                 return (0);
9538
9539         return (1);
9540 }
9541
9542 static u_int
9543 ahd_resolve_seqaddr(struct ahd_softc *ahd, u_int address)
9544 {
9545         const struct patch *cur_patch;
9546         int address_offset;
9547         u_int skip_addr;
9548         u_int i;
9549
9550         address_offset = 0;
9551         cur_patch = patches;
9552         skip_addr = 0;
9553
9554         for (i = 0; i < address;) {
9555
9556                 ahd_check_patch(ahd, &cur_patch, i, &skip_addr);
9557
9558                 if (skip_addr > i) {
9559                         int end_addr;
9560
9561                         end_addr = min(address, skip_addr);
9562                         address_offset += end_addr - i;
9563                         i = skip_addr;
9564                 } else {
9565                         i++;
9566                 }
9567         }
9568         return (address - address_offset);
9569 }
9570
9571 static void
9572 ahd_download_instr(struct ahd_softc *ahd, u_int instrptr, uint8_t *dconsts)
9573 {
9574         union   ins_formats instr;
9575         struct  ins_format1 *fmt1_ins;
9576         struct  ins_format3 *fmt3_ins;
9577         u_int   opcode;
9578
9579         /*
9580          * The firmware is always compiled into a little endian format.
9581          */
9582         instr.integer = ahd_le32toh(*(uint32_t*)&seqprog[instrptr * 4]);
9583
9584         fmt1_ins = &instr.format1;
9585         fmt3_ins = NULL;
9586
9587         /* Pull the opcode */
9588         opcode = instr.format1.opcode;
9589         switch (opcode) {
9590         case AIC_OP_JMP:
9591         case AIC_OP_JC:
9592         case AIC_OP_JNC:
9593         case AIC_OP_CALL:
9594         case AIC_OP_JNE:
9595         case AIC_OP_JNZ:
9596         case AIC_OP_JE:
9597         case AIC_OP_JZ:
9598         {
9599                 fmt3_ins = &instr.format3;
9600                 fmt3_ins->address = ahd_resolve_seqaddr(ahd, fmt3_ins->address);
9601                 /* FALLTHROUGH */
9602         }
9603         case AIC_OP_OR:
9604         case AIC_OP_AND:
9605         case AIC_OP_XOR:
9606         case AIC_OP_ADD:
9607         case AIC_OP_ADC:
9608         case AIC_OP_BMOV:
9609                 if (fmt1_ins->parity != 0) {
9610                         fmt1_ins->immediate = dconsts[fmt1_ins->immediate];
9611                 }
9612                 fmt1_ins->parity = 0;
9613                 /* FALLTHROUGH */
9614         case AIC_OP_ROL:
9615         {
9616                 int i, count;
9617
9618                 /* Calculate odd parity for the instruction */
9619                 for (i = 0, count = 0; i < 31; i++) {
9620                         uint32_t mask;
9621
9622                         mask = 0x01 << i;
9623                         if ((instr.integer & mask) != 0)
9624                                 count++;
9625                 }
9626                 if ((count & 0x01) == 0)
9627                         instr.format1.parity = 1;
9628
9629                 /* The sequencer is a little endian cpu */
9630                 instr.integer = ahd_htole32(instr.integer);
9631                 ahd_outsb(ahd, SEQRAM, instr.bytes, 4);
9632                 break;
9633         }
9634         default:
9635                 panic("Unknown opcode encountered in seq program");
9636                 break;
9637         }
9638 }
9639
9640 static int
9641 ahd_probe_stack_size(struct ahd_softc *ahd)
9642 {
9643         int last_probe;
9644
9645         last_probe = 0;
9646         while (1) {
9647                 int i;
9648
9649                 /*
9650                  * We avoid using 0 as a pattern to avoid
9651                  * confusion if the stack implementation
9652                  * "back-fills" with zeros when "poping'
9653                  * entries.
9654                  */
9655                 for (i = 1; i <= last_probe+1; i++) {
9656                        ahd_outb(ahd, STACK, i & 0xFF);
9657                        ahd_outb(ahd, STACK, (i >> 8) & 0xFF);
9658                 }
9659
9660                 /* Verify */
9661                 for (i = last_probe+1; i > 0; i--) {
9662                         u_int stack_entry;
9663
9664                         stack_entry = ahd_inb(ahd, STACK)
9665                                     |(ahd_inb(ahd, STACK) << 8);
9666                         if (stack_entry != i)
9667                                 goto sized;
9668                 }
9669                 last_probe++;
9670         }
9671 sized:
9672         return (last_probe);
9673 }
9674
9675 int
9676 ahd_print_register(const ahd_reg_parse_entry_t *table, u_int num_entries,
9677                    const char *name, u_int address, u_int value,
9678                    u_int *cur_column, u_int wrap_point)
9679 {
9680         int     printed;
9681         u_int   printed_mask;
9682
9683         if (cur_column != NULL && *cur_column >= wrap_point) {
9684                 printf("\n");
9685                 *cur_column = 0;
9686         }
9687         printed = printf("%s[0x%x]", name, value);
9688         if (table == NULL) {
9689                 printed += printf(" ");
9690                 *cur_column += printed;
9691                 return (printed);
9692         }
9693         printed_mask = 0;
9694         while (printed_mask != 0xFF) {
9695                 int entry;
9696
9697                 for (entry = 0; entry < num_entries; entry++) {
9698                         if (((value & table[entry].mask)
9699                           != table[entry].value)
9700                          || ((printed_mask & table[entry].mask)
9701                           == table[entry].mask))
9702                                 continue;
9703
9704                         printed += printf("%s%s",
9705                                           printed_mask == 0 ? ":(" : "|",
9706                                           table[entry].name);
9707                         printed_mask |= table[entry].mask;
9708
9709                         break;
9710                 }
9711                 if (entry >= num_entries)
9712                         break;
9713         }
9714         if (printed_mask != 0)
9715                 printed += printf(") ");
9716         else
9717                 printed += printf(" ");
9718         if (cur_column != NULL)
9719                 *cur_column += printed;
9720         return (printed);
9721 }
9722
9723 void
9724 ahd_dump_card_state(struct ahd_softc *ahd)
9725 {
9726         struct scb      *scb;
9727         ahd_mode_state   saved_modes;
9728         u_int            dffstat;
9729         int              paused;
9730         u_int            scb_index;
9731         u_int            saved_scb_index;
9732         u_int            cur_col;
9733         int              i;
9734
9735         if (ahd_is_paused(ahd)) {
9736                 paused = 1;
9737         } else {
9738                 paused = 0;
9739                 ahd_pause(ahd);
9740         }
9741         saved_modes = ahd_save_modes(ahd);
9742         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
9743         printf(">>>>>>>>>>>>>>>>>> Dump Card State Begins <<<<<<<<<<<<<<<<<\n"
9744                "%s: Dumping Card State at program address 0x%x Mode 0x%x\n",
9745                ahd_name(ahd),
9746                ahd_inw(ahd, CURADDR),
9747                ahd_build_mode_state(ahd, ahd->saved_src_mode,
9748                                     ahd->saved_dst_mode));
9749         if (paused)
9750                 printf("Card was paused\n");
9751
9752         if (ahd_check_cmdcmpltqueues(ahd))
9753                 printf("Completions are pending\n");
9754
9755         /*
9756          * Mode independent registers.
9757          */
9758         cur_col = 0;
9759         ahd_intstat_print(ahd_inb(ahd, INTSTAT), &cur_col, 50);
9760         ahd_seloid_print(ahd_inb(ahd, SELOID), &cur_col, 50);
9761         ahd_selid_print(ahd_inb(ahd, SELID), &cur_col, 50);
9762         ahd_hs_mailbox_print(ahd_inb(ahd, LOCAL_HS_MAILBOX), &cur_col, 50);
9763         ahd_intctl_print(ahd_inb(ahd, INTCTL), &cur_col, 50);
9764         ahd_seqintstat_print(ahd_inb(ahd, SEQINTSTAT), &cur_col, 50);
9765         ahd_saved_mode_print(ahd_inb(ahd, SAVED_MODE), &cur_col, 50);
9766         ahd_dffstat_print(ahd_inb(ahd, DFFSTAT), &cur_col, 50);
9767         ahd_scsisigi_print(ahd_inb(ahd, SCSISIGI), &cur_col, 50);
9768         ahd_scsiphase_print(ahd_inb(ahd, SCSIPHASE), &cur_col, 50);
9769         ahd_scsibus_print(ahd_inb(ahd, SCSIBUS), &cur_col, 50);
9770         ahd_lastphase_print(ahd_inb(ahd, LASTPHASE), &cur_col, 50);
9771         ahd_scsiseq0_print(ahd_inb(ahd, SCSISEQ0), &cur_col, 50);
9772         ahd_scsiseq1_print(ahd_inb(ahd, SCSISEQ1), &cur_col, 50);
9773         ahd_seqctl0_print(ahd_inb(ahd, SEQCTL0), &cur_col, 50);
9774         ahd_seqintctl_print(ahd_inb(ahd, SEQINTCTL), &cur_col, 50);
9775         ahd_seq_flags_print(ahd_inb(ahd, SEQ_FLAGS), &cur_col, 50);
9776         ahd_seq_flags2_print(ahd_inb(ahd, SEQ_FLAGS2), &cur_col, 50);
9777         ahd_qfreeze_count_print(ahd_inw(ahd, QFREEZE_COUNT), &cur_col, 50);
9778         ahd_kernel_qfreeze_count_print(ahd_inw(ahd, KERNEL_QFREEZE_COUNT),
9779                                        &cur_col, 50);
9780         ahd_mk_message_scb_print(ahd_inw(ahd, MK_MESSAGE_SCB), &cur_col, 50);
9781         ahd_mk_message_scsiid_print(ahd_inb(ahd, MK_MESSAGE_SCSIID),
9782                                     &cur_col, 50);
9783         ahd_sstat0_print(ahd_inb(ahd, SSTAT0), &cur_col, 50);
9784         ahd_sstat1_print(ahd_inb(ahd, SSTAT1), &cur_col, 50);
9785         ahd_sstat2_print(ahd_inb(ahd, SSTAT2), &cur_col, 50);
9786         ahd_sstat3_print(ahd_inb(ahd, SSTAT3), &cur_col, 50);
9787         ahd_perrdiag_print(ahd_inb(ahd, PERRDIAG), &cur_col, 50);
9788         ahd_simode1_print(ahd_inb(ahd, SIMODE1), &cur_col, 50);
9789         ahd_lqistat0_print(ahd_inb(ahd, LQISTAT0), &cur_col, 50);
9790         ahd_lqistat1_print(ahd_inb(ahd, LQISTAT1), &cur_col, 50);
9791         ahd_lqistat2_print(ahd_inb(ahd, LQISTAT2), &cur_col, 50);
9792         ahd_lqostat0_print(ahd_inb(ahd, LQOSTAT0), &cur_col, 50);
9793         ahd_lqostat1_print(ahd_inb(ahd, LQOSTAT1), &cur_col, 50);
9794         ahd_lqostat2_print(ahd_inb(ahd, LQOSTAT2), &cur_col, 50);
9795         printf("\n");
9796         printf("\nSCB Count = %d CMDS_PENDING = %d LASTSCB 0x%x "
9797                "CURRSCB 0x%x NEXTSCB 0x%x\n",
9798                ahd->scb_data.numscbs, ahd_inw(ahd, CMDS_PENDING),
9799                ahd_inw(ahd, LASTSCB), ahd_inw(ahd, CURRSCB),
9800                ahd_inw(ahd, NEXTSCB));
9801         cur_col = 0;
9802         /* QINFIFO */
9803         ahd_search_qinfifo(ahd, CAM_TARGET_WILDCARD, ALL_CHANNELS,
9804                            CAM_LUN_WILDCARD, SCB_LIST_NULL,
9805                            ROLE_UNKNOWN, /*status*/0, SEARCH_PRINT);
9806         saved_scb_index = ahd_get_scbptr(ahd);
9807         printf("Pending list:");
9808         i = 0;
9809         LIST_FOREACH(scb, &ahd->pending_scbs, pending_links) {
9810                 if (i++ > AHD_SCB_MAX)
9811                         break;
9812                 cur_col = printf("\n%3d FIFO_USE[0x%x] ", SCB_GET_TAG(scb),
9813                                  ahd_inb_scbram(ahd, SCB_FIFO_USE_COUNT));
9814                 ahd_set_scbptr(ahd, SCB_GET_TAG(scb));
9815                 ahd_scb_control_print(ahd_inb_scbram(ahd, SCB_CONTROL),
9816                                       &cur_col, 60);
9817                 ahd_scb_scsiid_print(ahd_inb_scbram(ahd, SCB_SCSIID),
9818                                      &cur_col, 60);
9819         }
9820         printf("\nTotal %d\n", i);
9821
9822         printf("Kernel Free SCB list: ");
9823         i = 0;
9824         TAILQ_FOREACH(scb, &ahd->scb_data.free_scbs, links.tqe) {
9825                 struct scb *list_scb;
9826
9827                 list_scb = scb;
9828                 do {
9829                         printf("%d ", SCB_GET_TAG(list_scb));
9830                         list_scb = LIST_NEXT(list_scb, collision_links);
9831                 } while (list_scb && i++ < AHD_SCB_MAX);
9832         }
9833
9834         LIST_FOREACH(scb, &ahd->scb_data.any_dev_free_scb_list, links.le) {
9835                 if (i++ > AHD_SCB_MAX)
9836                         break;
9837                 printf("%d ", SCB_GET_TAG(scb));
9838         }
9839         printf("\n");
9840
9841         printf("Sequencer Complete DMA-inprog list: ");
9842         scb_index = ahd_inw(ahd, COMPLETE_SCB_DMAINPROG_HEAD);
9843         i = 0;
9844         while (!SCBID_IS_NULL(scb_index) && i++ < AHD_SCB_MAX) {
9845                 ahd_set_scbptr(ahd, scb_index);
9846                 printf("%d ", scb_index);
9847                 scb_index = ahd_inw_scbram(ahd, SCB_NEXT_COMPLETE);
9848         }
9849         printf("\n");
9850
9851         printf("Sequencer Complete list: ");
9852         scb_index = ahd_inw(ahd, COMPLETE_SCB_HEAD);
9853         i = 0;
9854         while (!SCBID_IS_NULL(scb_index) && i++ < AHD_SCB_MAX) {
9855                 ahd_set_scbptr(ahd, scb_index);
9856                 printf("%d ", scb_index);
9857                 scb_index = ahd_inw_scbram(ahd, SCB_NEXT_COMPLETE);
9858         }
9859         printf("\n");
9860
9861
9862         printf("Sequencer DMA-Up and Complete list: ");
9863         scb_index = ahd_inw(ahd, COMPLETE_DMA_SCB_HEAD);
9864         i = 0;
9865         while (!SCBID_IS_NULL(scb_index) && i++ < AHD_SCB_MAX) {
9866                 ahd_set_scbptr(ahd, scb_index);
9867                 printf("%d ", scb_index);
9868                 scb_index = ahd_inw_scbram(ahd, SCB_NEXT_COMPLETE);
9869         }
9870         printf("\n");
9871         printf("Sequencer On QFreeze and Complete list: ");
9872         scb_index = ahd_inw(ahd, COMPLETE_ON_QFREEZE_HEAD);
9873         i = 0;
9874         while (!SCBID_IS_NULL(scb_index) && i++ < AHD_SCB_MAX) {
9875                 ahd_set_scbptr(ahd, scb_index);
9876                 printf("%d ", scb_index);
9877                 scb_index = ahd_inw_scbram(ahd, SCB_NEXT_COMPLETE);
9878         }
9879         printf("\n");
9880         ahd_set_scbptr(ahd, saved_scb_index);
9881         dffstat = ahd_inb(ahd, DFFSTAT);
9882         for (i = 0; i < 2; i++) {
9883 #ifdef AHD_DEBUG
9884                 struct scb *fifo_scb;
9885 #endif
9886                 u_int       fifo_scbptr;
9887
9888                 ahd_set_modes(ahd, AHD_MODE_DFF0 + i, AHD_MODE_DFF0 + i);
9889                 fifo_scbptr = ahd_get_scbptr(ahd);
9890                 printf("\n\n%s: FIFO%d %s, LONGJMP == 0x%x, SCB 0x%x\n",
9891                        ahd_name(ahd), i,
9892                        (dffstat & (FIFO0FREE << i)) ? "Free" : "Active",
9893                        ahd_inw(ahd, LONGJMP_ADDR), fifo_scbptr);
9894                 cur_col = 0;
9895                 ahd_seqimode_print(ahd_inb(ahd, SEQIMODE), &cur_col, 50);
9896                 ahd_seqintsrc_print(ahd_inb(ahd, SEQINTSRC), &cur_col, 50);
9897                 ahd_dfcntrl_print(ahd_inb(ahd, DFCNTRL), &cur_col, 50);
9898                 ahd_dfstatus_print(ahd_inb(ahd, DFSTATUS), &cur_col, 50);
9899                 ahd_sg_cache_shadow_print(ahd_inb(ahd, SG_CACHE_SHADOW),
9900                                           &cur_col, 50);
9901                 ahd_sg_state_print(ahd_inb(ahd, SG_STATE), &cur_col, 50);
9902                 ahd_dffsxfrctl_print(ahd_inb(ahd, DFFSXFRCTL), &cur_col, 50);
9903                 ahd_soffcnt_print(ahd_inb(ahd, SOFFCNT), &cur_col, 50);
9904                 ahd_mdffstat_print(ahd_inb(ahd, MDFFSTAT), &cur_col, 50);
9905                 if (cur_col > 50) {
9906                         printf("\n");
9907                         cur_col = 0;
9908                 }
9909                 cur_col += printf("SHADDR = 0x%x%x, SHCNT = 0x%x ",
9910                                   ahd_inl(ahd, SHADDR+4),
9911                                   ahd_inl(ahd, SHADDR),
9912                                   (ahd_inb(ahd, SHCNT)
9913                                 | (ahd_inb(ahd, SHCNT + 1) << 8)
9914                                 | (ahd_inb(ahd, SHCNT + 2) << 16)));
9915                 if (cur_col > 50) {
9916                         printf("\n");
9917                         cur_col = 0;
9918                 }
9919                 cur_col += printf("HADDR = 0x%x%x, HCNT = 0x%x ",
9920                                   ahd_inl(ahd, HADDR+4),
9921                                   ahd_inl(ahd, HADDR),
9922                                   (ahd_inb(ahd, HCNT)
9923                                 | (ahd_inb(ahd, HCNT + 1) << 8)
9924                                 | (ahd_inb(ahd, HCNT + 2) << 16)));
9925                 ahd_ccsgctl_print(ahd_inb(ahd, CCSGCTL), &cur_col, 50);
9926 #ifdef AHD_DEBUG
9927                 if ((ahd_debug & AHD_SHOW_SG) != 0) {
9928                         fifo_scb = ahd_lookup_scb(ahd, fifo_scbptr);
9929                         if (fifo_scb != NULL)
9930                                 ahd_dump_sglist(fifo_scb);
9931                 }
9932 #endif
9933         }
9934         printf("\nLQIN: ");
9935         for (i = 0; i < 20; i++)
9936                 printf("0x%x ", ahd_inb(ahd, LQIN + i));
9937         printf("\n");
9938         ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
9939         printf("%s: LQISTATE = 0x%x, LQOSTATE = 0x%x, OPTIONMODE = 0x%x\n",
9940                ahd_name(ahd), ahd_inb(ahd, LQISTATE), ahd_inb(ahd, LQOSTATE),
9941                ahd_inb(ahd, OPTIONMODE));
9942         printf("%s: OS_SPACE_CNT = 0x%x MAXCMDCNT = 0x%x\n",
9943                ahd_name(ahd), ahd_inb(ahd, OS_SPACE_CNT),
9944                ahd_inb(ahd, MAXCMDCNT));
9945         printf("%s: SAVED_SCSIID = 0x%x SAVED_LUN = 0x%x\n",
9946                ahd_name(ahd), ahd_inb(ahd, SAVED_SCSIID),
9947                ahd_inb(ahd, SAVED_LUN));
9948         ahd_simode0_print(ahd_inb(ahd, SIMODE0), &cur_col, 50);
9949         printf("\n");
9950         ahd_set_modes(ahd, AHD_MODE_CCHAN, AHD_MODE_CCHAN);
9951         cur_col = 0;
9952         ahd_ccscbctl_print(ahd_inb(ahd, CCSCBCTL), &cur_col, 50);
9953         printf("\n");
9954         ahd_set_modes(ahd, ahd->saved_src_mode, ahd->saved_dst_mode);
9955         printf("%s: REG0 == 0x%x, SINDEX = 0x%x, DINDEX = 0x%x\n",
9956                ahd_name(ahd), ahd_inw(ahd, REG0), ahd_inw(ahd, SINDEX),
9957                ahd_inw(ahd, DINDEX));
9958         printf("%s: SCBPTR == 0x%x, SCB_NEXT == 0x%x, SCB_NEXT2 == 0x%x\n",
9959                ahd_name(ahd), ahd_get_scbptr(ahd),
9960                ahd_inw_scbram(ahd, SCB_NEXT),
9961                ahd_inw_scbram(ahd, SCB_NEXT2));
9962         printf("CDB %x %x %x %x %x %x\n",
9963                ahd_inb_scbram(ahd, SCB_CDB_STORE),
9964                ahd_inb_scbram(ahd, SCB_CDB_STORE+1),
9965                ahd_inb_scbram(ahd, SCB_CDB_STORE+2),
9966                ahd_inb_scbram(ahd, SCB_CDB_STORE+3),
9967                ahd_inb_scbram(ahd, SCB_CDB_STORE+4),
9968                ahd_inb_scbram(ahd, SCB_CDB_STORE+5));
9969         printf("STACK:");
9970         for (i = 0; i < ahd->stack_size; i++) {
9971                 ahd->saved_stack[i] =
9972                     ahd_inb(ahd, STACK)|(ahd_inb(ahd, STACK) << 8);
9973                 printf(" 0x%x", ahd->saved_stack[i]);
9974         }
9975         for (i = ahd->stack_size-1; i >= 0; i--) {
9976                 ahd_outb(ahd, STACK, ahd->saved_stack[i] & 0xFF);
9977                 ahd_outb(ahd, STACK, (ahd->saved_stack[i] >> 8) & 0xFF);
9978         }
9979         printf("\n<<<<<<<<<<<<<<<<< Dump Card State Ends >>>>>>>>>>>>>>>>>>\n");
9980         ahd_restore_modes(ahd, saved_modes);
9981         if (paused == 0)
9982                 ahd_unpause(ahd);
9983 }
9984
9985 #if 0
9986 void
9987 ahd_dump_scbs(struct ahd_softc *ahd)
9988 {
9989         ahd_mode_state saved_modes;
9990         u_int          saved_scb_index;
9991         int            i;
9992
9993         saved_modes = ahd_save_modes(ahd);
9994         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
9995         saved_scb_index = ahd_get_scbptr(ahd);
9996         for (i = 0; i < AHD_SCB_MAX; i++) {
9997                 ahd_set_scbptr(ahd, i);
9998                 printf("%3d", i);
9999                 printf("(CTRL 0x%x ID 0x%x N 0x%x N2 0x%x SG 0x%x, RSG 0x%x)\n",
10000                        ahd_inb_scbram(ahd, SCB_CONTROL),
10001                        ahd_inb_scbram(ahd, SCB_SCSIID),
10002                        ahd_inw_scbram(ahd, SCB_NEXT),
10003                        ahd_inw_scbram(ahd, SCB_NEXT2),
10004                        ahd_inl_scbram(ahd, SCB_SGPTR),
10005                        ahd_inl_scbram(ahd, SCB_RESIDUAL_SGPTR));
10006         }
10007         printf("\n");
10008         ahd_set_scbptr(ahd, saved_scb_index);
10009         ahd_restore_modes(ahd, saved_modes);
10010 }
10011 #endif  /*  0  */
10012
10013 /**************************** Flexport Logic **********************************/
10014 /*
10015  * Read count 16bit words from 16bit word address start_addr from the
10016  * SEEPROM attached to the controller, into buf, using the controller's
10017  * SEEPROM reading state machine.  Optionally treat the data as a byte
10018  * stream in terms of byte order.
10019  */
10020 int
10021 ahd_read_seeprom(struct ahd_softc *ahd, uint16_t *buf,
10022                  u_int start_addr, u_int count, int bytestream)
10023 {
10024         u_int cur_addr;
10025         u_int end_addr;
10026         int   error;
10027
10028         /*
10029          * If we never make it through the loop even once,
10030          * we were passed invalid arguments.
10031          */
10032         error = EINVAL;
10033         AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
10034         end_addr = start_addr + count;
10035         for (cur_addr = start_addr; cur_addr < end_addr; cur_addr++) {
10036
10037                 ahd_outb(ahd, SEEADR, cur_addr);
10038                 ahd_outb(ahd, SEECTL, SEEOP_READ | SEESTART);
10039
10040                 error = ahd_wait_seeprom(ahd);
10041                 if (error)
10042                         break;
10043                 if (bytestream != 0) {
10044                         uint8_t *bytestream_ptr;
10045
10046                         bytestream_ptr = (uint8_t *)buf;
10047                         *bytestream_ptr++ = ahd_inb(ahd, SEEDAT);
10048                         *bytestream_ptr = ahd_inb(ahd, SEEDAT+1);
10049                 } else {
10050                         /*
10051                          * ahd_inw() already handles machine byte order.
10052                          */
10053                         *buf = ahd_inw(ahd, SEEDAT);
10054                 }
10055                 buf++;
10056         }
10057         return (error);
10058 }
10059
10060 /*
10061  * Write count 16bit words from buf, into SEEPROM attache to the
10062  * controller starting at 16bit word address start_addr, using the
10063  * controller's SEEPROM writing state machine.
10064  */
10065 int
10066 ahd_write_seeprom(struct ahd_softc *ahd, uint16_t *buf,
10067                   u_int start_addr, u_int count)
10068 {
10069         u_int cur_addr;
10070         u_int end_addr;
10071         int   error;
10072         int   retval;
10073
10074         AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
10075         error = ENOENT;
10076
10077         /* Place the chip into write-enable mode */
10078         ahd_outb(ahd, SEEADR, SEEOP_EWEN_ADDR);
10079         ahd_outb(ahd, SEECTL, SEEOP_EWEN | SEESTART);
10080         error = ahd_wait_seeprom(ahd);
10081         if (error)
10082                 return (error);
10083
10084         /*
10085          * Write the data.  If we don't get throught the loop at
10086          * least once, the arguments were invalid.
10087          */
10088         retval = EINVAL;
10089         end_addr = start_addr + count;
10090         for (cur_addr = start_addr; cur_addr < end_addr; cur_addr++) {
10091                 ahd_outw(ahd, SEEDAT, *buf++);
10092                 ahd_outb(ahd, SEEADR, cur_addr);
10093                 ahd_outb(ahd, SEECTL, SEEOP_WRITE | SEESTART);
10094
10095                 retval = ahd_wait_seeprom(ahd);
10096                 if (retval)
10097                         break;
10098         }
10099
10100         /*
10101          * Disable writes.
10102          */
10103         ahd_outb(ahd, SEEADR, SEEOP_EWDS_ADDR);
10104         ahd_outb(ahd, SEECTL, SEEOP_EWDS | SEESTART);
10105         error = ahd_wait_seeprom(ahd);
10106         if (error)
10107                 return (error);
10108         return (retval);
10109 }
10110
10111 /*
10112  * Wait ~100us for the serial eeprom to satisfy our request.
10113  */
10114 static int
10115 ahd_wait_seeprom(struct ahd_softc *ahd)
10116 {
10117         int cnt;
10118
10119         cnt = 5000;
10120         while ((ahd_inb(ahd, SEESTAT) & (SEEARBACK|SEEBUSY)) != 0 && --cnt)
10121                 ahd_delay(5);
10122
10123         if (cnt == 0)
10124                 return (ETIMEDOUT);
10125         return (0);
10126 }
10127
10128 /*
10129  * Validate the two checksums in the per_channel
10130  * vital product data struct.
10131  */
10132 static int
10133 ahd_verify_vpd_cksum(struct vpd_config *vpd)
10134 {
10135         int i;
10136         int maxaddr;
10137         uint32_t checksum;
10138         uint8_t *vpdarray;
10139
10140         vpdarray = (uint8_t *)vpd;
10141         maxaddr = offsetof(struct vpd_config, vpd_checksum);
10142         checksum = 0;
10143         for (i = offsetof(struct vpd_config, resource_type); i < maxaddr; i++)
10144                 checksum = checksum + vpdarray[i];
10145         if (checksum == 0
10146          || (-checksum & 0xFF) != vpd->vpd_checksum)
10147                 return (0);
10148
10149         checksum = 0;
10150         maxaddr = offsetof(struct vpd_config, checksum);
10151         for (i = offsetof(struct vpd_config, default_target_flags);
10152              i < maxaddr; i++)
10153                 checksum = checksum + vpdarray[i];
10154         if (checksum == 0
10155          || (-checksum & 0xFF) != vpd->checksum)
10156                 return (0);
10157         return (1);
10158 }
10159
10160 int
10161 ahd_verify_cksum(struct seeprom_config *sc)
10162 {
10163         int i;
10164         int maxaddr;
10165         uint32_t checksum;
10166         uint16_t *scarray;
10167
10168         maxaddr = (sizeof(*sc)/2) - 1;
10169         checksum = 0;
10170         scarray = (uint16_t *)sc;
10171
10172         for (i = 0; i < maxaddr; i++)
10173                 checksum = checksum + scarray[i];
10174         if (checksum == 0
10175          || (checksum & 0xFFFF) != sc->checksum) {
10176                 return (0);
10177         } else {
10178                 return (1);
10179         }
10180 }
10181
10182 int
10183 ahd_acquire_seeprom(struct ahd_softc *ahd)
10184 {
10185         /*
10186          * We should be able to determine the SEEPROM type
10187          * from the flexport logic, but unfortunately not
10188          * all implementations have this logic and there is
10189          * no programatic method for determining if the logic
10190          * is present.
10191          */
10192         return (1);
10193 #if 0
10194         uint8_t seetype;
10195         int     error;
10196
10197         error = ahd_read_flexport(ahd, FLXADDR_ROMSTAT_CURSENSECTL, &seetype);
10198         if (error != 0
10199          || ((seetype & FLX_ROMSTAT_SEECFG) == FLX_ROMSTAT_SEE_NONE))
10200                 return (0);
10201         return (1);
10202 #endif
10203 }
10204
10205 void
10206 ahd_release_seeprom(struct ahd_softc *ahd)
10207 {
10208         /* Currently a no-op */
10209 }
10210
10211 /*
10212  * Wait at most 2 seconds for flexport arbitration to succeed.
10213  */
10214 static int
10215 ahd_wait_flexport(struct ahd_softc *ahd)
10216 {
10217         int cnt;
10218
10219         AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
10220         cnt = 1000000 * 2 / 5;
10221         while ((ahd_inb(ahd, BRDCTL) & FLXARBACK) == 0 && --cnt)
10222                 ahd_delay(5);
10223
10224         if (cnt == 0)
10225                 return (ETIMEDOUT);
10226         return (0);
10227 }
10228
10229 int
10230 ahd_write_flexport(struct ahd_softc *ahd, u_int addr, u_int value)
10231 {
10232         int error;
10233
10234         AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
10235         if (addr > 7)
10236                 panic("ahd_write_flexport: address out of range");
10237         ahd_outb(ahd, BRDCTL, BRDEN|(addr << 3));
10238         error = ahd_wait_flexport(ahd);
10239         if (error != 0)
10240                 return (error);
10241         ahd_outb(ahd, BRDDAT, value);
10242         ahd_flush_device_writes(ahd);
10243         ahd_outb(ahd, BRDCTL, BRDSTB|BRDEN|(addr << 3));
10244         ahd_flush_device_writes(ahd);
10245         ahd_outb(ahd, BRDCTL, BRDEN|(addr << 3));
10246         ahd_flush_device_writes(ahd);
10247         ahd_outb(ahd, BRDCTL, 0);
10248         ahd_flush_device_writes(ahd);
10249         return (0);
10250 }
10251
10252 int
10253 ahd_read_flexport(struct ahd_softc *ahd, u_int addr, uint8_t *value)
10254 {
10255         int     error;
10256
10257         AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
10258         if (addr > 7)
10259                 panic("ahd_read_flexport: address out of range");
10260         ahd_outb(ahd, BRDCTL, BRDRW|BRDEN|(addr << 3));
10261         error = ahd_wait_flexport(ahd);
10262         if (error != 0)
10263                 return (error);
10264         *value = ahd_inb(ahd, BRDDAT);
10265         ahd_outb(ahd, BRDCTL, 0);
10266         ahd_flush_device_writes(ahd);
10267         return (0);
10268 }
10269
10270 /************************* Target Mode ****************************************/
10271 #ifdef AHD_TARGET_MODE
10272 cam_status
10273 ahd_find_tmode_devs(struct ahd_softc *ahd, struct cam_sim *sim, union ccb *ccb,
10274                     struct ahd_tmode_tstate **tstate,
10275                     struct ahd_tmode_lstate **lstate,
10276                     int notfound_failure)
10277 {
10278
10279         if ((ahd->features & AHD_TARGETMODE) == 0)
10280                 return (CAM_REQ_INVALID);
10281
10282         /*
10283          * Handle the 'black hole' device that sucks up
10284          * requests to unattached luns on enabled targets.
10285          */
10286         if (ccb->ccb_h.target_id == CAM_TARGET_WILDCARD
10287          && ccb->ccb_h.target_lun == CAM_LUN_WILDCARD) {
10288                 *tstate = NULL;
10289                 *lstate = ahd->black_hole;
10290         } else {
10291                 u_int max_id;
10292
10293                 max_id = (ahd->features & AHD_WIDE) ? 16 : 8;
10294                 if (ccb->ccb_h.target_id >= max_id)
10295                         return (CAM_TID_INVALID);
10296
10297                 if (ccb->ccb_h.target_lun >= AHD_NUM_LUNS)
10298                         return (CAM_LUN_INVALID);
10299
10300                 *tstate = ahd->enabled_targets[ccb->ccb_h.target_id];
10301                 *lstate = NULL;
10302                 if (*tstate != NULL)
10303                         *lstate =
10304                             (*tstate)->enabled_luns[ccb->ccb_h.target_lun];
10305         }
10306
10307         if (notfound_failure != 0 && *lstate == NULL)
10308                 return (CAM_PATH_INVALID);
10309
10310         return (CAM_REQ_CMP);
10311 }
10312
10313 void
10314 ahd_handle_en_lun(struct ahd_softc *ahd, struct cam_sim *sim, union ccb *ccb)
10315 {
10316 #if NOT_YET
10317         struct     ahd_tmode_tstate *tstate;
10318         struct     ahd_tmode_lstate *lstate;
10319         struct     ccb_en_lun *cel;
10320         cam_status status;
10321         u_int      target;
10322         u_int      lun;
10323         u_int      target_mask;
10324         u_long     s;
10325         char       channel;
10326
10327         status = ahd_find_tmode_devs(ahd, sim, ccb, &tstate, &lstate,
10328                                      /*notfound_failure*/FALSE);
10329
10330         if (status != CAM_REQ_CMP) {
10331                 ccb->ccb_h.status = status;
10332                 return;
10333         }
10334
10335         if ((ahd->features & AHD_MULTIROLE) != 0) {
10336                 u_int      our_id;
10337
10338                 our_id = ahd->our_id;
10339                 if (ccb->ccb_h.target_id != our_id) {
10340                         if ((ahd->features & AHD_MULTI_TID) != 0
10341                          && (ahd->flags & AHD_INITIATORROLE) != 0) {
10342                                 /*
10343                                  * Only allow additional targets if
10344                                  * the initiator role is disabled.
10345                                  * The hardware cannot handle a re-select-in
10346                                  * on the initiator id during a re-select-out
10347                                  * on a different target id.
10348                                  */
10349                                 status = CAM_TID_INVALID;
10350                         } else if ((ahd->flags & AHD_INITIATORROLE) != 0
10351                                 || ahd->enabled_luns > 0) {
10352                                 /*
10353                                  * Only allow our target id to change
10354                                  * if the initiator role is not configured
10355                                  * and there are no enabled luns which
10356                                  * are attached to the currently registered
10357                                  * scsi id.
10358                                  */
10359                                 status = CAM_TID_INVALID;
10360                         }
10361                 }
10362         }
10363
10364         if (status != CAM_REQ_CMP) {
10365                 ccb->ccb_h.status = status;
10366                 return;
10367         }
10368
10369         /*
10370          * We now have an id that is valid.
10371          * If we aren't in target mode, switch modes.
10372          */
10373         if ((ahd->flags & AHD_TARGETROLE) == 0
10374          && ccb->ccb_h.target_id != CAM_TARGET_WILDCARD) {
10375                 u_long  s;
10376
10377                 printf("Configuring Target Mode\n");
10378                 ahd_lock(ahd, &s);
10379                 if (LIST_FIRST(&ahd->pending_scbs) != NULL) {
10380                         ccb->ccb_h.status = CAM_BUSY;
10381                         ahd_unlock(ahd, &s);
10382                         return;
10383                 }
10384                 ahd->flags |= AHD_TARGETROLE;
10385                 if ((ahd->features & AHD_MULTIROLE) == 0)
10386                         ahd->flags &= ~AHD_INITIATORROLE;
10387                 ahd_pause(ahd);
10388                 ahd_loadseq(ahd);
10389                 ahd_restart(ahd);
10390                 ahd_unlock(ahd, &s);
10391         }
10392         cel = &ccb->cel;
10393         target = ccb->ccb_h.target_id;
10394         lun = ccb->ccb_h.target_lun;
10395         channel = SIM_CHANNEL(ahd, sim);
10396         target_mask = 0x01 << target;
10397         if (channel == 'B')
10398                 target_mask <<= 8;
10399
10400         if (cel->enable != 0) {
10401                 u_int scsiseq1;
10402
10403                 /* Are we already enabled?? */
10404                 if (lstate != NULL) {
10405                         xpt_print_path(ccb->ccb_h.path);
10406                         printf("Lun already enabled\n");
10407                         ccb->ccb_h.status = CAM_LUN_ALRDY_ENA;
10408                         return;
10409                 }
10410
10411                 if (cel->grp6_len != 0
10412                  || cel->grp7_len != 0) {
10413                         /*
10414                          * Don't (yet?) support vendor
10415                          * specific commands.
10416                          */
10417                         ccb->ccb_h.status = CAM_REQ_INVALID;
10418                         printf("Non-zero Group Codes\n");
10419                         return;
10420                 }
10421
10422                 /*
10423                  * Seems to be okay.
10424                  * Setup our data structures.
10425                  */
10426                 if (target != CAM_TARGET_WILDCARD && tstate == NULL) {
10427                         tstate = ahd_alloc_tstate(ahd, target, channel);
10428                         if (tstate == NULL) {
10429                                 xpt_print_path(ccb->ccb_h.path);
10430                                 printf("Couldn't allocate tstate\n");
10431                                 ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
10432                                 return;
10433                         }
10434                 }
10435                 lstate = malloc(sizeof(*lstate), M_DEVBUF, M_NOWAIT);
10436                 if (lstate == NULL) {
10437                         xpt_print_path(ccb->ccb_h.path);
10438                         printf("Couldn't allocate lstate\n");
10439                         ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
10440                         return;
10441                 }
10442                 memset(lstate, 0, sizeof(*lstate));
10443                 status = xpt_create_path(&lstate->path, /*periph*/NULL,
10444                                          xpt_path_path_id(ccb->ccb_h.path),
10445                                          xpt_path_target_id(ccb->ccb_h.path),
10446                                          xpt_path_lun_id(ccb->ccb_h.path));
10447                 if (status != CAM_REQ_CMP) {
10448                         free(lstate, M_DEVBUF);
10449                         xpt_print_path(ccb->ccb_h.path);
10450                         printf("Couldn't allocate path\n");
10451                         ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
10452                         return;
10453                 }
10454                 SLIST_INIT(&lstate->accept_tios);
10455                 SLIST_INIT(&lstate->immed_notifies);
10456                 ahd_lock(ahd, &s);
10457                 ahd_pause(ahd);
10458                 if (target != CAM_TARGET_WILDCARD) {
10459                         tstate->enabled_luns[lun] = lstate;
10460                         ahd->enabled_luns++;
10461
10462                         if ((ahd->features & AHD_MULTI_TID) != 0) {
10463                                 u_int targid_mask;
10464
10465                                 targid_mask = ahd_inw(ahd, TARGID);
10466                                 targid_mask |= target_mask;
10467                                 ahd_outw(ahd, TARGID, targid_mask);
10468                                 ahd_update_scsiid(ahd, targid_mask);
10469                         } else {
10470                                 u_int our_id;
10471                                 char  channel;
10472
10473                                 channel = SIM_CHANNEL(ahd, sim);
10474                                 our_id = SIM_SCSI_ID(ahd, sim);
10475
10476                                 /*
10477                                  * This can only happen if selections
10478                                  * are not enabled
10479                                  */
10480                                 if (target != our_id) {
10481                                         u_int sblkctl;
10482                                         char  cur_channel;
10483                                         int   swap;
10484
10485                                         sblkctl = ahd_inb(ahd, SBLKCTL);
10486                                         cur_channel = (sblkctl & SELBUSB)
10487                                                     ? 'B' : 'A';
10488                                         if ((ahd->features & AHD_TWIN) == 0)
10489                                                 cur_channel = 'A';
10490                                         swap = cur_channel != channel;
10491                                         ahd->our_id = target;
10492
10493                                         if (swap)
10494                                                 ahd_outb(ahd, SBLKCTL,
10495                                                          sblkctl ^ SELBUSB);
10496
10497                                         ahd_outb(ahd, SCSIID, target);
10498
10499                                         if (swap)
10500                                                 ahd_outb(ahd, SBLKCTL, sblkctl);
10501                                 }
10502                         }
10503                 } else
10504                         ahd->black_hole = lstate;
10505                 /* Allow select-in operations */
10506                 if (ahd->black_hole != NULL && ahd->enabled_luns > 0) {
10507                         scsiseq1 = ahd_inb(ahd, SCSISEQ_TEMPLATE);
10508                         scsiseq1 |= ENSELI;
10509                         ahd_outb(ahd, SCSISEQ_TEMPLATE, scsiseq1);
10510                         scsiseq1 = ahd_inb(ahd, SCSISEQ1);
10511                         scsiseq1 |= ENSELI;
10512                         ahd_outb(ahd, SCSISEQ1, scsiseq1);
10513                 }
10514                 ahd_unpause(ahd);
10515                 ahd_unlock(ahd, &s);
10516                 ccb->ccb_h.status = CAM_REQ_CMP;
10517                 xpt_print_path(ccb->ccb_h.path);
10518                 printf("Lun now enabled for target mode\n");
10519         } else {
10520                 struct scb *scb;
10521                 int i, empty;
10522
10523                 if (lstate == NULL) {
10524                         ccb->ccb_h.status = CAM_LUN_INVALID;
10525                         return;
10526                 }
10527
10528                 ahd_lock(ahd, &s);
10529
10530                 ccb->ccb_h.status = CAM_REQ_CMP;
10531                 LIST_FOREACH(scb, &ahd->pending_scbs, pending_links) {
10532                         struct ccb_hdr *ccbh;
10533
10534                         ccbh = &scb->io_ctx->ccb_h;
10535                         if (ccbh->func_code == XPT_CONT_TARGET_IO
10536                          && !xpt_path_comp(ccbh->path, ccb->ccb_h.path)){
10537                                 printf("CTIO pending\n");
10538                                 ccb->ccb_h.status = CAM_REQ_INVALID;
10539                                 ahd_unlock(ahd, &s);
10540                                 return;
10541                         }
10542                 }
10543
10544                 if (SLIST_FIRST(&lstate->accept_tios) != NULL) {
10545                         printf("ATIOs pending\n");
10546                         ccb->ccb_h.status = CAM_REQ_INVALID;
10547                 }
10548
10549                 if (SLIST_FIRST(&lstate->immed_notifies) != NULL) {
10550                         printf("INOTs pending\n");
10551                         ccb->ccb_h.status = CAM_REQ_INVALID;
10552                 }
10553
10554                 if (ccb->ccb_h.status != CAM_REQ_CMP) {
10555                         ahd_unlock(ahd, &s);
10556                         return;
10557                 }
10558
10559                 xpt_print_path(ccb->ccb_h.path);
10560                 printf("Target mode disabled\n");
10561                 xpt_free_path(lstate->path);
10562                 free(lstate, M_DEVBUF);
10563
10564                 ahd_pause(ahd);
10565                 /* Can we clean up the target too? */
10566                 if (target != CAM_TARGET_WILDCARD) {
10567                         tstate->enabled_luns[lun] = NULL;
10568                         ahd->enabled_luns--;
10569                         for (empty = 1, i = 0; i < 8; i++)
10570                                 if (tstate->enabled_luns[i] != NULL) {
10571                                         empty = 0;
10572                                         break;
10573                                 }
10574
10575                         if (empty) {
10576                                 ahd_free_tstate(ahd, target, channel,
10577                                                 /*force*/FALSE);
10578                                 if (ahd->features & AHD_MULTI_TID) {
10579                                         u_int targid_mask;
10580
10581                                         targid_mask = ahd_inw(ahd, TARGID);
10582                                         targid_mask &= ~target_mask;
10583                                         ahd_outw(ahd, TARGID, targid_mask);
10584                                         ahd_update_scsiid(ahd, targid_mask);
10585                                 }
10586                         }
10587                 } else {
10588
10589                         ahd->black_hole = NULL;
10590
10591                         /*
10592                          * We can't allow selections without
10593                          * our black hole device.
10594                          */
10595                         empty = TRUE;
10596                 }
10597                 if (ahd->enabled_luns == 0) {
10598                         /* Disallow select-in */
10599                         u_int scsiseq1;
10600
10601                         scsiseq1 = ahd_inb(ahd, SCSISEQ_TEMPLATE);
10602                         scsiseq1 &= ~ENSELI;
10603                         ahd_outb(ahd, SCSISEQ_TEMPLATE, scsiseq1);
10604                         scsiseq1 = ahd_inb(ahd, SCSISEQ1);
10605                         scsiseq1 &= ~ENSELI;
10606                         ahd_outb(ahd, SCSISEQ1, scsiseq1);
10607
10608                         if ((ahd->features & AHD_MULTIROLE) == 0) {
10609                                 printf("Configuring Initiator Mode\n");
10610                                 ahd->flags &= ~AHD_TARGETROLE;
10611                                 ahd->flags |= AHD_INITIATORROLE;
10612                                 ahd_pause(ahd);
10613                                 ahd_loadseq(ahd);
10614                                 ahd_restart(ahd);
10615                                 /*
10616                                  * Unpaused.  The extra unpause
10617                                  * that follows is harmless.
10618                                  */
10619                         }
10620                 }
10621                 ahd_unpause(ahd);
10622                 ahd_unlock(ahd, &s);
10623         }
10624 #endif
10625 }
10626
10627 static void
10628 ahd_update_scsiid(struct ahd_softc *ahd, u_int targid_mask)
10629 {
10630 #if NOT_YET
10631         u_int scsiid_mask;
10632         u_int scsiid;
10633
10634         if ((ahd->features & AHD_MULTI_TID) == 0)
10635                 panic("ahd_update_scsiid called on non-multitid unit\n");
10636
10637         /*
10638          * Since we will rely on the TARGID mask
10639          * for selection enables, ensure that OID
10640          * in SCSIID is not set to some other ID
10641          * that we don't want to allow selections on.
10642          */
10643         if ((ahd->features & AHD_ULTRA2) != 0)
10644                 scsiid = ahd_inb(ahd, SCSIID_ULTRA2);
10645         else
10646                 scsiid = ahd_inb(ahd, SCSIID);
10647         scsiid_mask = 0x1 << (scsiid & OID);
10648         if ((targid_mask & scsiid_mask) == 0) {
10649                 u_int our_id;
10650
10651                 /* ffs counts from 1 */
10652                 our_id = ffs(targid_mask);
10653                 if (our_id == 0)
10654                         our_id = ahd->our_id;
10655                 else
10656                         our_id--;
10657                 scsiid &= TID;
10658                 scsiid |= our_id;
10659         }
10660         if ((ahd->features & AHD_ULTRA2) != 0)
10661                 ahd_outb(ahd, SCSIID_ULTRA2, scsiid);
10662         else
10663                 ahd_outb(ahd, SCSIID, scsiid);
10664 #endif
10665 }
10666
10667 static void
10668 ahd_run_tqinfifo(struct ahd_softc *ahd, int paused)
10669 {
10670         struct target_cmd *cmd;
10671
10672         ahd_sync_tqinfifo(ahd, BUS_DMASYNC_POSTREAD);
10673         while ((cmd = &ahd->targetcmds[ahd->tqinfifonext])->cmd_valid != 0) {
10674
10675                 /*
10676                  * Only advance through the queue if we
10677                  * have the resources to process the command.
10678                  */
10679                 if (ahd_handle_target_cmd(ahd, cmd) != 0)
10680                         break;
10681
10682                 cmd->cmd_valid = 0;
10683                 ahd_dmamap_sync(ahd, ahd->shared_data_dmat,
10684                                 ahd->shared_data_map.dmamap,
10685                                 ahd_targetcmd_offset(ahd, ahd->tqinfifonext),
10686                                 sizeof(struct target_cmd),
10687                                 BUS_DMASYNC_PREREAD);
10688                 ahd->tqinfifonext++;
10689
10690                 /*
10691                  * Lazily update our position in the target mode incoming
10692                  * command queue as seen by the sequencer.
10693                  */
10694                 if ((ahd->tqinfifonext & (HOST_TQINPOS - 1)) == 1) {
10695                         u_int hs_mailbox;
10696
10697                         hs_mailbox = ahd_inb(ahd, HS_MAILBOX);
10698                         hs_mailbox &= ~HOST_TQINPOS;
10699                         hs_mailbox |= ahd->tqinfifonext & HOST_TQINPOS;
10700                         ahd_outb(ahd, HS_MAILBOX, hs_mailbox);
10701                 }
10702         }
10703 }
10704
10705 static int
10706 ahd_handle_target_cmd(struct ahd_softc *ahd, struct target_cmd *cmd)
10707 {
10708         struct    ahd_tmode_tstate *tstate;
10709         struct    ahd_tmode_lstate *lstate;
10710         struct    ccb_accept_tio *atio;
10711         uint8_t *byte;
10712         int       initiator;
10713         int       target;
10714         int       lun;
10715
10716         initiator = SCSIID_TARGET(ahd, cmd->scsiid);
10717         target = SCSIID_OUR_ID(cmd->scsiid);
10718         lun    = (cmd->identify & MSG_IDENTIFY_LUNMASK);
10719
10720         byte = cmd->bytes;
10721         tstate = ahd->enabled_targets[target];
10722         lstate = NULL;
10723         if (tstate != NULL)
10724                 lstate = tstate->enabled_luns[lun];
10725
10726         /*
10727          * Commands for disabled luns go to the black hole driver.
10728          */
10729         if (lstate == NULL)
10730                 lstate = ahd->black_hole;
10731
10732         atio = (struct ccb_accept_tio*)SLIST_FIRST(&lstate->accept_tios);
10733         if (atio == NULL) {
10734                 ahd->flags |= AHD_TQINFIFO_BLOCKED;
10735                 /*
10736                  * Wait for more ATIOs from the peripheral driver for this lun.
10737                  */
10738                 return (1);
10739         } else
10740                 ahd->flags &= ~AHD_TQINFIFO_BLOCKED;
10741 #ifdef AHD_DEBUG
10742         if ((ahd_debug & AHD_SHOW_TQIN) != 0)
10743                 printf("Incoming command from %d for %d:%d%s\n",
10744                        initiator, target, lun,
10745                        lstate == ahd->black_hole ? "(Black Holed)" : "");
10746 #endif
10747         SLIST_REMOVE_HEAD(&lstate->accept_tios, sim_links.sle);
10748
10749         if (lstate == ahd->black_hole) {
10750                 /* Fill in the wildcards */
10751                 atio->ccb_h.target_id = target;
10752                 atio->ccb_h.target_lun = lun;
10753         }
10754
10755         /*
10756          * Package it up and send it off to
10757          * whomever has this lun enabled.
10758          */
10759         atio->sense_len = 0;
10760         atio->init_id = initiator;
10761         if (byte[0] != 0xFF) {
10762                 /* Tag was included */
10763                 atio->tag_action = *byte++;
10764                 atio->tag_id = *byte++;
10765                 atio->ccb_h.flags = CAM_TAG_ACTION_VALID;
10766         } else {
10767                 atio->ccb_h.flags = 0;
10768         }
10769         byte++;
10770
10771         /* Okay.  Now determine the cdb size based on the command code */
10772         switch (*byte >> CMD_GROUP_CODE_SHIFT) {
10773         case 0:
10774                 atio->cdb_len = 6;
10775                 break;
10776         case 1:
10777         case 2:
10778                 atio->cdb_len = 10;
10779                 break;
10780         case 4:
10781                 atio->cdb_len = 16;
10782                 break;
10783         case 5:
10784                 atio->cdb_len = 12;
10785                 break;
10786         case 3:
10787         default:
10788                 /* Only copy the opcode. */
10789                 atio->cdb_len = 1;
10790                 printf("Reserved or VU command code type encountered\n");
10791                 break;
10792         }
10793
10794         memcpy(atio->cdb_io.cdb_bytes, byte, atio->cdb_len);
10795
10796         atio->ccb_h.status |= CAM_CDB_RECVD;
10797
10798         if ((cmd->identify & MSG_IDENTIFY_DISCFLAG) == 0) {
10799                 /*
10800                  * We weren't allowed to disconnect.
10801                  * We're hanging on the bus until a
10802                  * continue target I/O comes in response
10803                  * to this accept tio.
10804                  */
10805 #ifdef AHD_DEBUG
10806                 if ((ahd_debug & AHD_SHOW_TQIN) != 0)
10807                         printf("Received Immediate Command %d:%d:%d - %p\n",
10808                                initiator, target, lun, ahd->pending_device);
10809 #endif
10810                 ahd->pending_device = lstate;
10811                 ahd_freeze_ccb((union ccb *)atio);
10812                 atio->ccb_h.flags |= CAM_DIS_DISCONNECT;
10813         }
10814         xpt_done((union ccb*)atio);
10815         return (0);
10816 }
10817
10818 #endif