git.oblomov.eu Git - linux-2.6/blob - drivers/scsi/aic7xxx/aic7xxx_osm.c

   1 /*
   2  * Adaptec AIC7xxx device driver for Linux.
   3  *
   4  * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.c#235 $
   5  *
   6  * Copyright (c) 1994 John Aycock
   7  *   The University of Calgary Department of Computer Science.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2, or (at your option)
  12  * any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; see the file COPYING.  If not, write to
  21  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  * Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F
  24  * driver (ultrastor.c), various Linux kernel source, the Adaptec EISA
  25  * config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide,
  26  * the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux,
  27  * the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file
  28  * (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual,
  29  * the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the
  30  * ANSI SCSI-2 specification (draft 10c), ...
  31  *
  32  * --------------------------------------------------------------------------
  33  *
  34  *  Modifications by Daniel M. Eischen (deischen@iworks.InterWorks.org):
  35  *
  36  *  Substantially modified to include support for wide and twin bus
  37  *  adapters, DMAing of SCBs, tagged queueing, IRQ sharing, bug fixes,
  38  *  SCB paging, and other rework of the code.
  39  *
  40  * --------------------------------------------------------------------------
  41  * Copyright (c) 1994-2000 Justin T. Gibbs.
  42  * Copyright (c) 2000-2001 Adaptec Inc.
  43  * All rights reserved.
  44  *
  45  * Redistribution and use in source and binary forms, with or without
  46  * modification, are permitted provided that the following conditions
  47  * are met:
  48  * 1. Redistributions of source code must retain the above copyright
  49  *    notice, this list of conditions, and the following disclaimer,
  50  *    without modification.
  51  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  52  *    substantially similar to the "NO WARRANTY" disclaimer below
  53  *    ("Disclaimer") and any redistribution must be conditioned upon
  54  *    including a substantially similar Disclaimer requirement for further
  55  *    binary redistribution.
  56  * 3. Neither the names of the above-listed copyright holders nor the names
  57  *    of any contributors may be used to endorse or promote products derived
  58  *    from this software without specific prior written permission.
  59  *
  60  * Alternatively, this software may be distributed under the terms of the
  61  * GNU General Public License ("GPL") version 2 as published by the Free
  62  * Software Foundation.
  63  *
  64  * NO WARRANTY
  65  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  66  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  67  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  68  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  69  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  70  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  71  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  72  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  73  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  74  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  75  * POSSIBILITY OF SUCH DAMAGES.
  76  *
  77  *---------------------------------------------------------------------------
  78  *
  79  *  Thanks also go to (in alphabetical order) the following:
  80  *
  81  *    Rory Bolt     - Sequencer bug fixes
  82  *    Jay Estabrook - Initial DEC Alpha support
  83  *    Doug Ledford  - Much needed abort/reset bug fixes
  84  *    Kai Makisara  - DMAing of SCBs
  85  *
  86  *  A Boot time option was also added for not resetting the scsi bus.
  87  *
  88  *    Form:  aic7xxx=extended
  89  *           aic7xxx=no_reset
  90  *           aic7xxx=verbose
  91  *
  92  *  Daniel M. Eischen, deischen@iworks.InterWorks.org, 1/23/97
  93  *
  94  *  Id: aic7xxx.c,v 4.1 1997/06/12 08:23:42 deang Exp
  95  */
  96
  97 /*
  98  * Further driver modifications made by Doug Ledford <dledford@redhat.com>
  99  *
 100  * Copyright (c) 1997-1999 Doug Ledford
 101  *
 102  * These changes are released under the same licensing terms as the FreeBSD
 103  * driver written by Justin Gibbs.  Please see his Copyright notice above
 104  * for the exact terms and conditions covering my changes as well as the
 105  * warranty statement.
 106  *
 107  * Modifications made to the aic7xxx.c,v 4.1 driver from Dan Eischen include
 108  * but are not limited to:
 109  *
 110  *  1: Import of the latest FreeBSD sequencer code for this driver
 111  *  2: Modification of kernel code to accommodate different sequencer semantics
 112  *  3: Extensive changes throughout kernel portion of driver to improve
 113  *     abort/reset processing and error hanndling
 114  *  4: Other work contributed by various people on the Internet
 115  *  5: Changes to printk information and verbosity selection code
 116  *  6: General reliability related changes, especially in IRQ management
 117  *  7: Modifications to the default probe/attach order for supported cards
 118  *  8: SMP friendliness has been improved
 119  *
 120  */
 121
 122 #include "aic7xxx_osm.h"
 123 #include "aic7xxx_inline.h"
 124 #include <scsi/scsicam.h>
 125
 126 static struct scsi_transport_template *ahc_linux_transport_template = NULL;
 127
 128 #include <linux/init.h>         /* __setup */
 129 #include <linux/mm.h>           /* For fetching system memory size */
 130 #include <linux/blkdev.h>               /* For block_size() */
 131 #include <linux/delay.h>        /* For ssleep/msleep */
 132
 133
 134 /*
 135  * Set this to the delay in seconds after SCSI bus reset.
 136  * Note, we honor this only for the initial bus reset.
 137  * The scsi error recovery code performs its own bus settle
 138  * delay handling for error recovery actions.
 139  */
 140 #ifdef CONFIG_AIC7XXX_RESET_DELAY_MS
 141 #define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
 142 #else
 143 #define AIC7XXX_RESET_DELAY 5000
 144 #endif
 145
 146 /*
 147  * Control collection of SCSI transfer statistics for the /proc filesystem.
 148  *
 149  * NOTE: Do NOT enable this when running on kernels version 1.2.x and below.
 150  * NOTE: This does affect performance since it has to maintain statistics.
 151  */
 152 #ifdef CONFIG_AIC7XXX_PROC_STATS
 153 #define AIC7XXX_PROC_STATS
 154 #endif
 155
 156 /*
 157  * To change the default number of tagged transactions allowed per-device,
 158  * add a line to the lilo.conf file like:
 159  * append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
 160  * which will result in the first four devices on the first two
 161  * controllers being set to a tagged queue depth of 32.
 162  *
 163  * The tag_commands is an array of 16 to allow for wide and twin adapters.
 164  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
 165  * for channel 1.
 166  */
 167 typedef struct {
 168         uint8_t tag_commands[16];       /* Allow for wide/twin adapters. */
 169 } adapter_tag_info_t;
 170
 171 /*
 172  * Modify this as you see fit for your system.
 173  *
 174  * 0                    tagged queuing disabled
 175  * 1 <= n <= 253        n == max tags ever dispatched.
 176  *
 177  * The driver will throttle the number of commands dispatched to a
 178  * device if it returns queue full.  For devices with a fixed maximum
 179  * queue depth, the driver will eventually determine this depth and
 180  * lock it in (a console message is printed to indicate that a lock
 181  * has occurred).  On some devices, queue full is returned for a temporary
 182  * resource shortage.  These devices will return queue full at varying
 183  * depths.  The driver will throttle back when the queue fulls occur and
 184  * attempt to slowly increase the depth over time as the device recovers
 185  * from the resource shortage.
 186  *
 187  * In this example, the first line will disable tagged queueing for all
 188  * the devices on the first probed aic7xxx adapter.
 189  *
 190  * The second line enables tagged queueing with 4 commands/LUN for IDs
 191  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
 192  * driver to attempt to use up to 64 tags for ID 1.
 193  *
 194  * The third line is the same as the first line.
 195  *
 196  * The fourth line disables tagged queueing for devices 0 and 3.  It
 197  * enables tagged queueing for the other IDs, with 16 commands/LUN
 198  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
 199  * IDs 2, 5-7, and 9-15.
 200  */
 201
 202 /*
 203  * NOTE: The below structure is for reference only, the actual structure
 204  *       to modify in order to change things is just below this comment block.
 205 adapter_tag_info_t aic7xxx_tag_info[] =
 206 {
 207         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 208         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
 209         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 210         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
 211 };
 212 */
 213
 214 #ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE
 215 #define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
 216 #else
 217 #define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
 218 #endif
 219
 220 #define AIC7XXX_CONFIGED_TAG_COMMANDS {                                 \
 221         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 222         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 223         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 224         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 225         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 226         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 227         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 228         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE                \
 229 }
 230
 231 /*
 232  * By default, use the number of commands specified by
 233  * the users kernel configuration.
 234  */
 235 static adapter_tag_info_t aic7xxx_tag_info[] =
 236 {
 237         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 238         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 239         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 240         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 241         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 242         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 243         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 244         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 245         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 246         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 247         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 248         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 249         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 250         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 251         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 252         {AIC7XXX_CONFIGED_TAG_COMMANDS}
 253 };
 254
 255 /*
 256  * There should be a specific return value for this in scsi.h, but
 257  * it seems that most drivers ignore it.
 258  */
 259 #define DID_UNDERFLOW   DID_ERROR
 260
 261 void
 262 ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
 263 {
 264         printk("(scsi%d:%c:%d:%d): ",
 265                ahc->platform_data->host->host_no,
 266                scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
 267                scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
 268                scb != NULL ? SCB_GET_LUN(scb) : -1);
 269 }
 270
 271 /*
 272  * XXX - these options apply unilaterally to _all_ 274x/284x/294x
 273  *       cards in the system.  This should be fixed.  Exceptions to this
 274  *       rule are noted in the comments.
 275  */
 276
 277 /*
 278  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
 279  * has no effect on any later resets that might occur due to things like
 280  * SCSI bus timeouts.
 281  */
 282 static uint32_t aic7xxx_no_reset;
 283
 284 /*
 285  * Should we force EXTENDED translation on a controller.
 286  *     0 == Use whatever is in the SEEPROM or default to off
 287  *     1 == Use whatever is in the SEEPROM or default to on
 288  */
 289 static uint32_t aic7xxx_extended;
 290
 291 /*
 292  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
 293  * dubious at best.  To my knowledge, this option has never actually
 294  * solved a PCI parity problem, but on certain machines with broken PCI
 295  * chipset configurations where stray PCI transactions with bad parity are
 296  * the norm rather than the exception, the error messages can be overwelming.
 297  * It's included in the driver for completeness.
 298  *   0     = Shut off PCI parity check
 299  *   non-0 = reverse polarity pci parity checking
 300  */
 301 static uint32_t aic7xxx_pci_parity = ~0;
 302
 303 /*
 304  * There are lots of broken chipsets in the world.  Some of them will
 305  * violate the PCI spec when we issue byte sized memory writes to our
 306  * controller.  I/O mapped register access, if allowed by the given
 307  * platform, will work in almost all cases.
 308  */
 309 uint32_t aic7xxx_allow_memio = ~0;
 310
 311 /*
 312  * So that we can set how long each device is given as a selection timeout.
 313  * The table of values goes like this:
 314  *   0 - 256ms
 315  *   1 - 128ms
 316  *   2 - 64ms
 317  *   3 - 32ms
 318  * We default to 256ms because some older devices need a longer time
 319  * to respond to initial selection.
 320  */
 321 static uint32_t aic7xxx_seltime;
 322
 323 /*
 324  * Certain devices do not perform any aging on commands.  Should the
 325  * device be saturated by commands in one portion of the disk, it is
 326  * possible for transactions on far away sectors to never be serviced.
 327  * To handle these devices, we can periodically send an ordered tag to
 328  * force all outstanding transactions to be serviced prior to a new
 329  * transaction.
 330  */
 331 uint32_t aic7xxx_periodic_otag;
 332
 333 /*
 334  * Module information and settable options.
 335  */
 336 static char *aic7xxx = NULL;
 337
 338 MODULE_AUTHOR("Maintainer: Justin T. Gibbs <gibbs@scsiguy.com>");
 339 MODULE_DESCRIPTION("Adaptec Aic77XX/78XX SCSI Host Bus Adapter driver");
 340 MODULE_LICENSE("Dual BSD/GPL");
 341 MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
 342 module_param(aic7xxx, charp, 0444);
 343 MODULE_PARM_DESC(aic7xxx,
 344 "period delimited, options string.\n"
 345 "       verbose                 Enable verbose/diagnostic logging\n"
 346 "       allow_memio             Allow device registers to be memory mapped\n"
 347 "       debug                   Bitmask of debug values to enable\n"
 348 "       no_probe                Toggle EISA/VLB controller probing\n"
 349 "       probe_eisa_vl           Toggle EISA/VLB controller probing\n"
 350 "       no_reset                Supress initial bus resets\n"
 351 "       extended                Enable extended geometry on all controllers\n"
 352 "       periodic_otag           Send an ordered tagged transaction\n"
 353 "                               periodically to prevent tag starvation.\n"
 354 "                               This may be required by some older disk\n"
 355 "                               drives or RAID arrays.\n"
 356 "       reverse_scan            Sort PCI devices highest Bus/Slot to lowest\n"
 357 "       tag_info:<tag_str>      Set per-target tag depth\n"
 358 "       global_tag_depth:<int>  Global tag depth for every target\n"
 359 "                               on every bus\n"
 360 "       seltime:<int>           Selection Timeout\n"
 361 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
 362 "\n"
 363 "       Sample /etc/modprobe.conf line:\n"
 364 "               Toggle EISA/VLB probing\n"
 365 "               Set tag depth on Controller 1/Target 1 to 10 tags\n"
 366 "               Shorten the selection timeout to 128ms\n"
 367 "\n"
 368 "       options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
 369 );
 370
 371 static void ahc_linux_handle_scsi_status(struct ahc_softc *,
 372                                          struct scsi_device *,
 373                                          struct scb *);
 374 static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
 375                                          struct scsi_cmnd *cmd);
 376 static void ahc_linux_sem_timeout(u_long arg);
 377 static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
 378 static void ahc_linux_release_simq(u_long arg);
 379 static int  ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
 380 static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
 381 static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
 382                                      struct ahc_devinfo *devinfo);
 383 static void ahc_linux_device_queue_depth(struct scsi_device *);
 384 static int ahc_linux_run_command(struct ahc_softc*,
 385                                  struct ahc_linux_device *,
 386                                  struct scsi_cmnd *);
 387 static void ahc_linux_setup_tag_info_global(char *p);
 388 static int  aic7xxx_setup(char *s);
 389
 390 static int ahc_linux_unit;
 391
 392
 393 /********************************* Inlines ************************************/
 394 static __inline void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
 395
 396 static __inline int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 397                                       struct ahc_dma_seg *sg,
 398                                       dma_addr_t addr, bus_size_t len);
 399
 400 static __inline void
 401 ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
 402 {
 403         struct scsi_cmnd *cmd;
 404
 405         cmd = scb->io_ctx;
 406         ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
 407         if (cmd->use_sg != 0) {
 408                 struct scatterlist *sg;
 409
 410                 sg = (struct scatterlist *)cmd->request_buffer;
 411                 pci_unmap_sg(ahc->dev_softc, sg, cmd->use_sg,
 412                              cmd->sc_data_direction);
 413         } else if (cmd->request_bufflen != 0) {
 414                 pci_unmap_single(ahc->dev_softc,
 415                                  scb->platform_data->buf_busaddr,
 416                                  cmd->request_bufflen,
 417                                  cmd->sc_data_direction);
 418         }
 419 }
 420
 421 static __inline int
 422 ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 423                   struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
 424 {
 425         int      consumed;
 426
 427         if ((scb->sg_count + 1) > AHC_NSEG)
 428                 panic("Too few segs for dma mapping.  "
 429                       "Increase AHC_NSEG\n");
 430
 431         consumed = 1;
 432         sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
 433         scb->platform_data->xfer_len += len;
 434
 435         if (sizeof(dma_addr_t) > 4
 436          && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
 437                 len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
 438
 439         sg->len = ahc_htole32(len);
 440         return (consumed);
 441 }
 442
 443 /*
 444  * Return a string describing the driver.
 445  */
 446 static const char *
 447 ahc_linux_info(struct Scsi_Host *host)
 448 {
 449         static char buffer[512];
 450         char    ahc_info[256];
 451         char   *bp;
 452         struct ahc_softc *ahc;
 453
 454         bp = &buffer[0];
 455         ahc = *(struct ahc_softc **)host->hostdata;
 456         memset(bp, 0, sizeof(buffer));
 457         strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev ");
 458         strcat(bp, AIC7XXX_DRIVER_VERSION);
 459         strcat(bp, "\n");
 460         strcat(bp, "        <");
 461         strcat(bp, ahc->description);
 462         strcat(bp, ">\n");
 463         strcat(bp, "        ");
 464         ahc_controller_info(ahc, ahc_info);
 465         strcat(bp, ahc_info);
 466         strcat(bp, "\n");
 467
 468         return (bp);
 469 }
 470
 471 /*
 472  * Queue an SCB to the controller.
 473  */
 474 static int
 475 ahc_linux_queue(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
 476 {
 477         struct   ahc_softc *ahc;
 478         struct   ahc_linux_device *dev = scsi_transport_device_data(cmd->device);
 479
 480         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 481
 482         /*
 483          * Save the callback on completion function.
 484          */
 485         cmd->scsi_done = scsi_done;
 486
 487         /*
 488          * Close the race of a command that was in the process of
 489          * being queued to us just as our simq was frozen.  Let
 490          * DV commands through so long as we are only frozen to
 491          * perform DV.
 492          */
 493         if (ahc->platform_data->qfrozen != 0)
 494                 return SCSI_MLQUEUE_HOST_BUSY;
 495
 496         cmd->result = CAM_REQ_INPROG << 16;
 497
 498         return ahc_linux_run_command(ahc, dev, cmd);
 499 }
 500
 501 static inline struct scsi_target **
 502 ahc_linux_target_in_softc(struct scsi_target *starget)
 503 {
 504         struct  ahc_softc *ahc =
 505                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 506         unsigned int target_offset;
 507
 508         target_offset = starget->id;
 509         if (starget->channel != 0)
 510                 target_offset += 8;
 511
 512         return &ahc->platform_data->starget[target_offset];
 513 }
 514
 515 static int
 516 ahc_linux_target_alloc(struct scsi_target *starget)
 517 {
 518         struct  ahc_softc *ahc =
 519                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 520         struct seeprom_config *sc = ahc->seep_config;
 521         unsigned long flags;
 522         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 523         struct ahc_linux_target *targ = scsi_transport_target_data(starget);
 524         unsigned short scsirate;
 525         struct ahc_devinfo devinfo;
 526         struct ahc_initiator_tinfo *tinfo;
 527         struct ahc_tmode_tstate *tstate;
 528         char channel = starget->channel + 'A';
 529         unsigned int our_id = ahc->our_id;
 530         unsigned int target_offset;
 531
 532         target_offset = starget->id;
 533         if (starget->channel != 0)
 534                 target_offset += 8;
 535
 536         if (starget->channel)
 537                 our_id = ahc->our_id_b;
 538
 539         ahc_lock(ahc, &flags);
 540
 541         BUG_ON(*ahc_targp != NULL);
 542
 543         *ahc_targp = starget;
 544         memset(targ, 0, sizeof(*targ));
 545
 546         if (sc) {
 547                 int maxsync = AHC_SYNCRATE_DT;
 548                 int ultra = 0;
 549                 int flags = sc->device_flags[target_offset];
 550
 551                 if (ahc->flags & AHC_NEWEEPROM_FMT) {
 552                     if (flags & CFSYNCHISULTRA)
 553                         ultra = 1;
 554                 } else if (flags & CFULTRAEN)
 555                         ultra = 1;
 556                 /* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
 557                  * change it to ultra=0, CFXFER = 0 */
 558                 if(ultra && (flags & CFXFER) == 0x04) {
 559                         ultra = 0;
 560                         flags &= ~CFXFER;
 561                 }
 562
 563                 if ((ahc->features & AHC_ULTRA2) != 0) {
 564                         scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
 565                 } else {
 566                         scsirate = (flags & CFXFER) << 4;
 567                         maxsync = ultra ? AHC_SYNCRATE_ULTRA :
 568                                 AHC_SYNCRATE_FAST;
 569                 }
 570                 spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
 571                 if (!(flags & CFSYNCH))
 572                         spi_max_offset(starget) = 0;
 573                 spi_min_period(starget) =
 574                         ahc_find_period(ahc, scsirate, maxsync);
 575
 576                 tinfo = ahc_fetch_transinfo(ahc, channel, ahc->our_id,
 577                                             starget->id, &tstate);
 578         }
 579         ahc_compile_devinfo(&devinfo, our_id, starget->id,
 580                             CAM_LUN_WILDCARD, channel,
 581                             ROLE_INITIATOR);
 582         ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
 583                          AHC_TRANS_GOAL, /*paused*/FALSE);
 584         ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
 585                       AHC_TRANS_GOAL, /*paused*/FALSE);
 586         ahc_unlock(ahc, &flags);
 587
 588         return 0;
 589 }
 590
 591 static void
 592 ahc_linux_target_destroy(struct scsi_target *starget)
 593 {
 594         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 595
 596         *ahc_targp = NULL;
 597 }
 598
 599 static int
 600 ahc_linux_slave_alloc(struct scsi_device *sdev)
 601 {
 602         struct  ahc_softc *ahc =
 603                 *((struct ahc_softc **)sdev->host->hostdata);
 604         struct scsi_target *starget = sdev->sdev_target;
 605         struct ahc_linux_target *targ = scsi_transport_target_data(starget);
 606         struct ahc_linux_device *dev;
 607
 608         if (bootverbose)
 609                 printf("%s: Slave Alloc %d\n", ahc_name(ahc), sdev->id);
 610
 611         BUG_ON(targ->sdev[sdev->lun] != NULL);
 612
 613         dev = scsi_transport_device_data(sdev);
 614         memset(dev, 0, sizeof(*dev));
 615
 616         /*
 617          * We start out life using untagged
 618          * transactions of which we allow one.
 619          */
 620         dev->openings = 1;
 621
 622         /*
 623          * Set maxtags to 0.  This will be changed if we
 624          * later determine that we are dealing with
 625          * a tagged queuing capable device.
 626          */
 627         dev->maxtags = 0;
 628
 629         targ->sdev[sdev->lun] = sdev;
 630
 631         spi_period(starget) = 0;
 632
 633         return 0;
 634 }
 635
 636 static int
 637 ahc_linux_slave_configure(struct scsi_device *sdev)
 638 {
 639         struct  ahc_softc *ahc;
 640
 641         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 642
 643         if (bootverbose)
 644                 printf("%s: Slave Configure %d\n", ahc_name(ahc), sdev->id);
 645
 646         ahc_linux_device_queue_depth(sdev);
 647
 648         /* Initial Domain Validation */
 649         if (!spi_initial_dv(sdev->sdev_target))
 650                 spi_dv_device(sdev);
 651
 652         return 0;
 653 }
 654
 655 static void
 656 ahc_linux_slave_destroy(struct scsi_device *sdev)
 657 {
 658         struct  ahc_softc *ahc;
 659         struct  ahc_linux_device *dev = scsi_transport_device_data(sdev);
 660         struct  ahc_linux_target *targ = scsi_transport_target_data(sdev->sdev_target);
 661
 662         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 663         if (bootverbose)
 664                 printf("%s: Slave Destroy %d\n", ahc_name(ahc), sdev->id);
 665
 666         BUG_ON(dev->active);
 667
 668         targ->sdev[sdev->lun] = NULL;
 669 }
 670
 671 #if defined(__i386__)
 672 /*
 673  * Return the disk geometry for the given SCSI device.
 674  */
 675 static int
 676 ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 677                     sector_t capacity, int geom[])
 678 {
 679         uint8_t *bh;
 680         int      heads;
 681         int      sectors;
 682         int      cylinders;
 683         int      ret;
 684         int      extended;
 685         struct   ahc_softc *ahc;
 686         u_int    channel;
 687
 688         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 689         channel = sdev->channel;
 690
 691         bh = scsi_bios_ptable(bdev);
 692         if (bh) {
 693                 ret = scsi_partsize(bh, capacity,
 694                                     &geom[2], &geom[0], &geom[1]);
 695                 kfree(bh);
 696                 if (ret != -1)
 697                         return (ret);
 698         }
 699         heads = 64;
 700         sectors = 32;
 701         cylinders = aic_sector_div(capacity, heads, sectors);
 702
 703         if (aic7xxx_extended != 0)
 704                 extended = 1;
 705         else if (channel == 0)
 706                 extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
 707         else
 708                 extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
 709         if (extended && cylinders >= 1024) {
 710                 heads = 255;
 711                 sectors = 63;
 712                 cylinders = aic_sector_div(capacity, heads, sectors);
 713         }
 714         geom[0] = heads;
 715         geom[1] = sectors;
 716         geom[2] = cylinders;
 717         return (0);
 718 }
 719 #endif
 720
 721 /*
 722  * Abort the current SCSI command(s).
 723  */
 724 static int
 725 ahc_linux_abort(struct scsi_cmnd *cmd)
 726 {
 727         int error;
 728
 729         error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
 730         if (error != 0)
 731                 printf("aic7xxx_abort returns 0x%x\n", error);
 732         return (error);
 733 }
 734
 735 /*
 736  * Attempt to send a target reset message to the device that timed out.
 737  */
 738 static int
 739 ahc_linux_dev_reset(struct scsi_cmnd *cmd)
 740 {
 741         int error;
 742
 743         error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
 744         if (error != 0)
 745                 printf("aic7xxx_dev_reset returns 0x%x\n", error);
 746         return (error);
 747 }
 748
 749 /*
 750  * Reset the SCSI bus.
 751  */
 752 static int
 753 ahc_linux_bus_reset(struct scsi_cmnd *cmd)
 754 {
 755         struct ahc_softc *ahc;
 756         int    found;
 757         unsigned long flags;
 758
 759         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 760
 761         ahc_lock(ahc, &flags);
 762         found = ahc_reset_channel(ahc, cmd->device->channel + 'A',
 763                                   /*initiate reset*/TRUE);
 764         ahc_unlock(ahc, &flags);
 765
 766         if (bootverbose)
 767                 printf("%s: SCSI bus reset delivered. "
 768                        "%d SCBs aborted.\n", ahc_name(ahc), found);
 769
 770         return SUCCESS;
 771 }
 772
 773 struct scsi_host_template aic7xxx_driver_template = {
 774         .module                 = THIS_MODULE,
 775         .name                   = "aic7xxx",
 776         .proc_name              = "aic7xxx",
 777         .proc_info              = ahc_linux_proc_info,
 778         .info                   = ahc_linux_info,
 779         .queuecommand           = ahc_linux_queue,
 780         .eh_abort_handler       = ahc_linux_abort,
 781         .eh_device_reset_handler = ahc_linux_dev_reset,
 782         .eh_bus_reset_handler   = ahc_linux_bus_reset,
 783 #if defined(__i386__)
 784         .bios_param             = ahc_linux_biosparam,
 785 #endif
 786         .can_queue              = AHC_MAX_QUEUE,
 787         .this_id                = -1,
 788         .cmd_per_lun            = 2,
 789         .use_clustering         = ENABLE_CLUSTERING,
 790         .slave_alloc            = ahc_linux_slave_alloc,
 791         .slave_configure        = ahc_linux_slave_configure,
 792         .slave_destroy          = ahc_linux_slave_destroy,
 793         .target_alloc           = ahc_linux_target_alloc,
 794         .target_destroy         = ahc_linux_target_destroy,
 795 };
 796
 797 /**************************** Tasklet Handler *********************************/
 798
 799 /******************************** Macros **************************************/
 800 #define BUILD_SCSIID(ahc, cmd)                                              \
 801         ((((cmd)->device->id << TID_SHIFT) & TID)                           \
 802         | (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
 803         | (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
 804
 805 /******************************** Bus DMA *************************************/
 806 int
 807 ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
 808                    bus_size_t alignment, bus_size_t boundary,
 809                    dma_addr_t lowaddr, dma_addr_t highaddr,
 810                    bus_dma_filter_t *filter, void *filterarg,
 811                    bus_size_t maxsize, int nsegments,
 812                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
 813 {
 814         bus_dma_tag_t dmat;
 815
 816         dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT);
 817         if (dmat == NULL)
 818                 return (ENOMEM);
 819
 820         /*
 821          * Linux is very simplistic about DMA memory.  For now don't
 822          * maintain all specification information.  Once Linux supplies
 823          * better facilities for doing these operations, or the
 824          * needs of this particular driver change, we might need to do
 825          * more here.
 826          */
 827         dmat->alignment = alignment;
 828         dmat->boundary = boundary;
 829         dmat->maxsize = maxsize;
 830         *ret_tag = dmat;
 831         return (0);
 832 }
 833
 834 void
 835 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
 836 {
 837         free(dmat, M_DEVBUF);
 838 }
 839
 840 int
 841 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
 842                  int flags, bus_dmamap_t *mapp)
 843 {
 844         *vaddr = pci_alloc_consistent(ahc->dev_softc,
 845                                       dmat->maxsize, mapp);
 846         if (*vaddr == NULL)
 847                 return ENOMEM;
 848         return 0;
 849 }
 850
 851 void
 852 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
 853                 void* vaddr, bus_dmamap_t map)
 854 {
 855         pci_free_consistent(ahc->dev_softc, dmat->maxsize,
 856                             vaddr, map);
 857 }
 858
 859 int
 860 ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
 861                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
 862                 void *cb_arg, int flags)
 863 {
 864         /*
 865          * Assume for now that this will only be used during
 866          * initialization and not for per-transaction buffer mapping.
 867          */
 868         bus_dma_segment_t stack_sg;
 869
 870         stack_sg.ds_addr = map;
 871         stack_sg.ds_len = dmat->maxsize;
 872         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
 873         return (0);
 874 }
 875
 876 void
 877 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 878 {
 879 }
 880
 881 int
 882 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 883 {
 884         /* Nothing to do */
 885         return (0);
 886 }
 887
 888 static void
 889 ahc_linux_setup_tag_info_global(char *p)
 890 {
 891         int tags, i, j;
 892
 893         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
 894         printf("Setting Global Tags= %d\n", tags);
 895
 896         for (i = 0; i < NUM_ELEMENTS(aic7xxx_tag_info); i++) {
 897                 for (j = 0; j < AHC_NUM_TARGETS; j++) {
 898                         aic7xxx_tag_info[i].tag_commands[j] = tags;
 899                 }
 900         }
 901 }
 902
 903 static void
 904 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
 905 {
 906
 907         if ((instance >= 0) && (targ >= 0)
 908          && (instance < NUM_ELEMENTS(aic7xxx_tag_info))
 909          && (targ < AHC_NUM_TARGETS)) {
 910                 aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
 911                 if (bootverbose)
 912                         printf("tag_info[%d:%d] = %d\n", instance, targ, value);
 913         }
 914 }
 915
 916 static char *
 917 ahc_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
 918                        void (*callback)(u_long, int, int, int32_t),
 919                        u_long callback_arg)
 920 {
 921         char    *tok_end;
 922         char    *tok_end2;
 923         int      i;
 924         int      instance;
 925         int      targ;
 926         int      done;
 927         char     tok_list[] = {'.', ',', '{', '}', '\0'};
 928
 929         /* All options use a ':' name/arg separator */
 930         if (*opt_arg != ':')
 931                 return (opt_arg);
 932         opt_arg++;
 933         instance = -1;
 934         targ = -1;
 935         done = FALSE;
 936         /*
 937          * Restore separator that may be in
 938          * the middle of our option argument.
 939          */
 940         tok_end = strchr(opt_arg, '\0');
 941         if (tok_end < end)
 942                 *tok_end = ',';
 943         while (!done) {
 944                 switch (*opt_arg) {
 945                 case '{':
 946                         if (instance == -1) {
 947                                 instance = 0;
 948                         } else {
 949                                 if (depth > 1) {
 950                                         if (targ == -1)
 951                                                 targ = 0;
 952                                 } else {
 953                                         printf("Malformed Option %s\n",
 954                                                opt_name);
 955                                         done = TRUE;
 956                                 }
 957                         }
 958                         opt_arg++;
 959                         break;
 960                 case '}':
 961                         if (targ != -1)
 962                                 targ = -1;
 963                         else if (instance != -1)
 964                                 instance = -1;
 965                         opt_arg++;
 966                         break;
 967                 case ',':
 968                 case '.':
 969                         if (instance == -1)
 970                                 done = TRUE;
 971                         else if (targ >= 0)
 972                                 targ++;
 973                         else if (instance >= 0)
 974                                 instance++;
 975                         opt_arg++;
 976                         break;
 977                 case '\0':
 978                         done = TRUE;
 979                         break;
 980                 default:
 981                         tok_end = end;
 982                         for (i = 0; tok_list[i]; i++) {
 983                                 tok_end2 = strchr(opt_arg, tok_list[i]);
 984                                 if ((tok_end2) && (tok_end2 < tok_end))
 985                                         tok_end = tok_end2;
 986                         }
 987                         callback(callback_arg, instance, targ,
 988                                  simple_strtol(opt_arg, NULL, 0));
 989                         opt_arg = tok_end;
 990                         break;
 991                 }
 992         }
 993         return (opt_arg);
 994 }
 995
 996 /*
 997  * Handle Linux boot parameters. This routine allows for assigning a value
 998  * to a parameter with a ':' between the parameter and the value.
 999  * ie. aic7xxx=stpwlev:1,extended
1000  */
1001 static int
1002 aic7xxx_setup(char *s)
1003 {
1004         int     i, n;
1005         char   *p;
1006         char   *end;
1007
1008         static struct {
1009                 const char *name;
1010                 uint32_t *flag;
1011         } options[] = {
1012                 { "extended", &aic7xxx_extended },
1013                 { "no_reset", &aic7xxx_no_reset },
1014                 { "verbose", &aic7xxx_verbose },
1015                 { "allow_memio", &aic7xxx_allow_memio},
1016 #ifdef AHC_DEBUG
1017                 { "debug", &ahc_debug },
1018 #endif
1019                 { "periodic_otag", &aic7xxx_periodic_otag },
1020                 { "pci_parity", &aic7xxx_pci_parity },
1021                 { "seltime", &aic7xxx_seltime },
1022                 { "tag_info", NULL },
1023                 { "global_tag_depth", NULL },
1024                 { "dv", NULL }
1025         };
1026
1027         end = strchr(s, '\0');
1028
1029         /*
1030          * XXX ia64 gcc isn't smart enough to know that NUM_ELEMENTS
1031          * will never be 0 in this case.
1032          */
1033         n = 0;
1034
1035         while ((p = strsep(&s, ",.")) != NULL) {
1036                 if (*p == '\0')
1037                         continue;
1038                 for (i = 0; i < NUM_ELEMENTS(options); i++) {
1039
1040                         n = strlen(options[i].name);
1041                         if (strncmp(options[i].name, p, n) == 0)
1042                                 break;
1043                 }
1044                 if (i == NUM_ELEMENTS(options))
1045                         continue;
1046
1047                 if (strncmp(p, "global_tag_depth", n) == 0) {
1048                         ahc_linux_setup_tag_info_global(p + n);
1049                 } else if (strncmp(p, "tag_info", n) == 0) {
1050                         s = ahc_parse_brace_option("tag_info", p + n, end,
1051                             2, ahc_linux_setup_tag_info, 0);
1052                 } else if (p[n] == ':') {
1053                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1054                 } else if (strncmp(p, "verbose", n) == 0) {
1055                         *(options[i].flag) = 1;
1056                 } else {
1057                         *(options[i].flag) ^= 0xFFFFFFFF;
1058                 }
1059         }
1060         return 1;
1061 }
1062
1063 __setup("aic7xxx=", aic7xxx_setup);
1064
1065 uint32_t aic7xxx_verbose;
1066
1067 int
1068 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
1069 {
1070         char     buf[80];
1071         struct   Scsi_Host *host;
1072         char    *new_name;
1073         u_long   s;
1074
1075         template->name = ahc->description;
1076         host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
1077         if (host == NULL)
1078                 return (ENOMEM);
1079
1080         *((struct ahc_softc **)host->hostdata) = ahc;
1081         ahc_lock(ahc, &s);
1082         scsi_assign_lock(host, &ahc->platform_data->spin_lock);
1083         ahc->platform_data->host = host;
1084         host->can_queue = AHC_MAX_QUEUE;
1085         host->cmd_per_lun = 2;
1086         /* XXX No way to communicate the ID for multiple channels */
1087         host->this_id = ahc->our_id;
1088         host->irq = ahc->platform_data->irq;
1089         host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1090         host->max_lun = AHC_NUM_LUNS;
1091         host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1092         host->sg_tablesize = AHC_NSEG;
1093         ahc_set_unit(ahc, ahc_linux_unit++);
1094         sprintf(buf, "scsi%d", host->host_no);
1095         new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT);
1096         if (new_name != NULL) {
1097                 strcpy(new_name, buf);
1098                 ahc_set_name(ahc, new_name);
1099         }
1100         host->unique_id = ahc->unit;
1101         ahc_linux_initialize_scsi_bus(ahc);
1102         ahc_intr_enable(ahc, TRUE);
1103         ahc_unlock(ahc, &s);
1104
1105         host->transportt = ahc_linux_transport_template;
1106
1107         scsi_add_host(host, (ahc->dev_softc ? &ahc->dev_softc->dev : NULL)); /* XXX handle failure */
1108         scsi_scan_host(host);
1109         return (0);
1110 }
1111
1112 uint64_t
1113 ahc_linux_get_memsize(void)
1114 {
1115         struct sysinfo si;
1116
1117         si_meminfo(&si);
1118         return ((uint64_t)si.totalram << PAGE_SHIFT);
1119 }
1120
1121 /*
1122  * Place the SCSI bus into a known state by either resetting it,
1123  * or forcing transfer negotiations on the next command to any
1124  * target.
1125  */
1126 void
1127 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1128 {
1129         int i;
1130         int numtarg;
1131
1132         i = 0;
1133         numtarg = 0;
1134
1135         if (aic7xxx_no_reset != 0)
1136                 ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1137
1138         if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1139                 ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
1140         else
1141                 numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1142
1143         if ((ahc->features & AHC_TWIN) != 0) {
1144
1145                 if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1146                         ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
1147                 } else {
1148                         if (numtarg == 0)
1149                                 i = 8;
1150                         numtarg += 8;
1151                 }
1152         }
1153
1154         /*
1155          * Force negotiation to async for all targets that
1156          * will not see an initial bus reset.
1157          */
1158         for (; i < numtarg; i++) {
1159                 struct ahc_devinfo devinfo;
1160                 struct ahc_initiator_tinfo *tinfo;
1161                 struct ahc_tmode_tstate *tstate;
1162                 u_int our_id;
1163                 u_int target_id;
1164                 char channel;
1165
1166                 channel = 'A';
1167                 our_id = ahc->our_id;
1168                 target_id = i;
1169                 if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1170                         channel = 'B';
1171                         our_id = ahc->our_id_b;
1172                         target_id = i % 8;
1173                 }
1174                 tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1175                                             target_id, &tstate);
1176                 ahc_compile_devinfo(&devinfo, our_id, target_id,
1177                                     CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
1178                 ahc_update_neg_request(ahc, &devinfo, tstate,
1179                                        tinfo, AHC_NEG_ALWAYS);
1180         }
1181         /* Give the bus some time to recover */
1182         if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1183                 ahc_linux_freeze_simq(ahc);
1184                 init_timer(&ahc->platform_data->reset_timer);
1185                 ahc->platform_data->reset_timer.data = (u_long)ahc;
1186                 ahc->platform_data->reset_timer.expires =
1187                     jiffies + (AIC7XXX_RESET_DELAY * HZ)/1000;
1188                 ahc->platform_data->reset_timer.function =
1189                     ahc_linux_release_simq;
1190                 add_timer(&ahc->platform_data->reset_timer);
1191         }
1192 }
1193
1194 int
1195 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1196 {
1197
1198         ahc->platform_data =
1199             malloc(sizeof(struct ahc_platform_data), M_DEVBUF, M_NOWAIT);
1200         if (ahc->platform_data == NULL)
1201                 return (ENOMEM);
1202         memset(ahc->platform_data, 0, sizeof(struct ahc_platform_data));
1203         ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1204         ahc_lockinit(ahc);
1205         init_MUTEX_LOCKED(&ahc->platform_data->eh_sem);
1206         ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1207         ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1208         if (aic7xxx_pci_parity == 0)
1209                 ahc->flags |= AHC_DISABLE_PCI_PERR;
1210
1211         return (0);
1212 }
1213
1214 void
1215 ahc_platform_free(struct ahc_softc *ahc)
1216 {
1217         struct scsi_target *starget;
1218         int i, j;
1219
1220         if (ahc->platform_data != NULL) {
1221                 if (ahc->platform_data->host != NULL) {
1222                         scsi_remove_host(ahc->platform_data->host);
1223                         scsi_host_put(ahc->platform_data->host);
1224                 }
1225
1226                 /* destroy all of the device and target objects */
1227                 for (i = 0; i < AHC_NUM_TARGETS; i++) {
1228                         starget = ahc->platform_data->starget[i];
1229                         if (starget != NULL) {
1230                                 for (j = 0; j < AHC_NUM_LUNS; j++) {
1231                                         struct ahc_linux_target *targ =
1232                                                 scsi_transport_target_data(starget);
1233
1234                                         if (targ->sdev[j] == NULL)
1235                                                 continue;
1236                                         targ->sdev[j] = NULL;
1237                                 }
1238                                 ahc->platform_data->starget[i] = NULL;
1239                         }
1240                 }
1241
1242                 if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1243                         free_irq(ahc->platform_data->irq, ahc);
1244                 if (ahc->tag == BUS_SPACE_PIO
1245                  && ahc->bsh.ioport != 0)
1246                         release_region(ahc->bsh.ioport, 256);
1247                 if (ahc->tag == BUS_SPACE_MEMIO
1248                  && ahc->bsh.maddr != NULL) {
1249                         iounmap(ahc->bsh.maddr);
1250                         release_mem_region(ahc->platform_data->mem_busaddr,
1251                                            0x1000);
1252                 }
1253
1254                 free(ahc->platform_data, M_DEVBUF);
1255         }
1256 }
1257
1258 void
1259 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1260 {
1261         ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1262                                 SCB_GET_CHANNEL(ahc, scb),
1263                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1264                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1265 }
1266
1267 void
1268 ahc_platform_set_tags(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
1269                       ahc_queue_alg alg)
1270 {
1271         struct scsi_target *starget;
1272         struct ahc_linux_target *targ;
1273         struct ahc_linux_device *dev;
1274         struct scsi_device *sdev;
1275         u_int target_offset;
1276         int was_queuing;
1277         int now_queuing;
1278
1279         target_offset = devinfo->target;
1280         if (devinfo->channel != 'A')
1281                 target_offset += 8;
1282         starget = ahc->platform_data->starget[target_offset];
1283         targ = scsi_transport_target_data(starget);
1284         BUG_ON(targ == NULL);
1285         sdev = targ->sdev[devinfo->lun];
1286         if (sdev == NULL)
1287                 return;
1288         dev = scsi_transport_device_data(sdev);
1289
1290         was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1291         switch (alg) {
1292         default:
1293         case AHC_QUEUE_NONE:
1294                 now_queuing = 0;
1295                 break;
1296         case AHC_QUEUE_BASIC:
1297                 now_queuing = AHC_DEV_Q_BASIC;
1298                 break;
1299         case AHC_QUEUE_TAGGED:
1300                 now_queuing = AHC_DEV_Q_TAGGED;
1301                 break;
1302         }
1303         if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1304          && (was_queuing != now_queuing)
1305          && (dev->active != 0)) {
1306                 dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1307                 dev->qfrozen++;
1308         }
1309
1310         dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1311         if (now_queuing) {
1312                 u_int usertags;
1313
1314                 usertags = ahc_linux_user_tagdepth(ahc, devinfo);
1315                 if (!was_queuing) {
1316                         /*
1317                          * Start out agressively and allow our
1318                          * dynamic queue depth algorithm to take
1319                          * care of the rest.
1320                          */
1321                         dev->maxtags = usertags;
1322                         dev->openings = dev->maxtags - dev->active;
1323                 }
1324                 if (dev->maxtags == 0) {
1325                         /*
1326                          * Queueing is disabled by the user.
1327                          */
1328                         dev->openings = 1;
1329                 } else if (alg == AHC_QUEUE_TAGGED) {
1330                         dev->flags |= AHC_DEV_Q_TAGGED;
1331                         if (aic7xxx_periodic_otag != 0)
1332                                 dev->flags |= AHC_DEV_PERIODIC_OTAG;
1333                 } else
1334                         dev->flags |= AHC_DEV_Q_BASIC;
1335         } else {
1336                 /* We can only have one opening. */
1337                 dev->maxtags = 0;
1338                 dev->openings =  1 - dev->active;
1339         }
1340         switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1341         case AHC_DEV_Q_BASIC:
1342                 scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
1343                 scsi_activate_tcq(sdev, dev->openings + dev->active);
1344                 break;
1345         case AHC_DEV_Q_TAGGED:
1346                 scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
1347                 scsi_activate_tcq(sdev, dev->openings + dev->active);
1348                 break;
1349         default:
1350                 /*
1351                  * We allow the OS to queue 2 untagged transactions to
1352                  * us at any time even though we can only execute them
1353                  * serially on the controller/device.  This should
1354                  * remove some latency.
1355                  */
1356                 scsi_deactivate_tcq(sdev, 2);
1357                 break;
1358         }
1359 }
1360
1361 int
1362 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1363                         int lun, u_int tag, role_t role, uint32_t status)
1364 {
1365         return 0;
1366 }
1367
1368 static u_int
1369 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1370 {
1371         static int warned_user;
1372         u_int tags;
1373
1374         tags = 0;
1375         if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1376                 if (ahc->unit >= NUM_ELEMENTS(aic7xxx_tag_info)) {
1377                         if (warned_user == 0) {
1378
1379                                 printf(KERN_WARNING
1380 "aic7xxx: WARNING: Insufficient tag_info instances\n"
1381 "aic7xxx: for installed controllers. Using defaults\n"
1382 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
1383 "aic7xxx: the aic7xxx_osm..c source file.\n");
1384                                 warned_user++;
1385                         }
1386                         tags = AHC_MAX_QUEUE;
1387                 } else {
1388                         adapter_tag_info_t *tag_info;
1389
1390                         tag_info = &aic7xxx_tag_info[ahc->unit];
1391                         tags = tag_info->tag_commands[devinfo->target_offset];
1392                         if (tags > AHC_MAX_QUEUE)
1393                                 tags = AHC_MAX_QUEUE;
1394                 }
1395         }
1396         return (tags);
1397 }
1398
1399 /*
1400  * Determines the queue depth for a given device.
1401  */
1402 static void
1403 ahc_linux_device_queue_depth(struct scsi_device *sdev)
1404 {
1405         struct  ahc_devinfo devinfo;
1406         u_int   tags;
1407         struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
1408
1409         ahc_compile_devinfo(&devinfo,
1410                             sdev->sdev_target->channel == 0
1411                           ? ahc->our_id : ahc->our_id_b,
1412                             sdev->sdev_target->id, sdev->lun,
1413                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1414                             ROLE_INITIATOR);
1415         tags = ahc_linux_user_tagdepth(ahc, &devinfo);
1416         if (tags != 0 && sdev->tagged_supported != 0) {
1417
1418                 ahc_set_tags(ahc, &devinfo, AHC_QUEUE_TAGGED);
1419                 ahc_print_devinfo(ahc, &devinfo);
1420                 printf("Tagged Queuing enabled.  Depth %d\n", tags);
1421         } else {
1422                 ahc_set_tags(ahc, &devinfo, AHC_QUEUE_NONE);
1423         }
1424 }
1425
1426 static int
1427 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1428                       struct scsi_cmnd *cmd)
1429 {
1430         struct   scb *scb;
1431         struct   hardware_scb *hscb;
1432         struct   ahc_initiator_tinfo *tinfo;
1433         struct   ahc_tmode_tstate *tstate;
1434         uint16_t mask;
1435         struct scb_tailq *untagged_q = NULL;
1436
1437         /*
1438          * Schedule us to run later.  The only reason we are not
1439          * running is because the whole controller Q is frozen.
1440          */
1441         if (ahc->platform_data->qfrozen != 0)
1442                 return SCSI_MLQUEUE_HOST_BUSY;
1443
1444         /*
1445          * We only allow one untagged transaction
1446          * per target in the initiator role unless
1447          * we are storing a full busy target *lun*
1448          * table in SCB space.
1449          */
1450         if (!blk_rq_tagged(cmd->request)
1451             && (ahc->features & AHC_SCB_BTT) == 0) {
1452                 int target_offset;
1453
1454                 target_offset = cmd->device->id + cmd->device->channel * 8;
1455                 untagged_q = &(ahc->untagged_queues[target_offset]);
1456                 if (!TAILQ_EMPTY(untagged_q))
1457                         /* if we're already executing an untagged command
1458                          * we're busy to another */
1459                         return SCSI_MLQUEUE_DEVICE_BUSY;
1460         }
1461
1462         /*
1463          * Get an scb to use.
1464          */
1465         scb = ahc_get_scb(ahc);
1466         if (!scb)
1467                 return SCSI_MLQUEUE_HOST_BUSY;
1468
1469         scb->io_ctx = cmd;
1470         scb->platform_data->dev = dev;
1471         hscb = scb->hscb;
1472         cmd->host_scribble = (char *)scb;
1473
1474         /*
1475          * Fill out basics of the HSCB.
1476          */
1477         hscb->control = 0;
1478         hscb->scsiid = BUILD_SCSIID(ahc, cmd);
1479         hscb->lun = cmd->device->lun;
1480         mask = SCB_GET_TARGET_MASK(ahc, scb);
1481         tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1482                                     SCB_GET_OUR_ID(scb),
1483                                     SCB_GET_TARGET(ahc, scb), &tstate);
1484         hscb->scsirate = tinfo->scsirate;
1485         hscb->scsioffset = tinfo->curr.offset;
1486         if ((tstate->ultraenb & mask) != 0)
1487                 hscb->control |= ULTRAENB;
1488
1489         if ((ahc->user_discenable & mask) != 0)
1490                 hscb->control |= DISCENB;
1491
1492         if ((tstate->auto_negotiate & mask) != 0) {
1493                 scb->flags |= SCB_AUTO_NEGOTIATE;
1494                 scb->hscb->control |= MK_MESSAGE;
1495         }
1496
1497         if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1498                 int     msg_bytes;
1499                 uint8_t tag_msgs[2];
1500
1501                 msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1502                 if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1503                         hscb->control |= tag_msgs[0];
1504                         if (tag_msgs[0] == MSG_ORDERED_TASK)
1505                                 dev->commands_since_idle_or_otag = 0;
1506                 } else if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1507                                 && (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1508                         hscb->control |= MSG_ORDERED_TASK;
1509                         dev->commands_since_idle_or_otag = 0;
1510                 } else {
1511                         hscb->control |= MSG_SIMPLE_TASK;
1512                 }
1513         }
1514
1515         hscb->cdb_len = cmd->cmd_len;
1516         if (hscb->cdb_len <= 12) {
1517                 memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1518         } else {
1519                 memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1520                 scb->flags |= SCB_CDB32_PTR;
1521         }
1522
1523         scb->platform_data->xfer_len = 0;
1524         ahc_set_residual(scb, 0);
1525         ahc_set_sense_residual(scb, 0);
1526         scb->sg_count = 0;
1527         if (cmd->use_sg != 0) {
1528                 struct  ahc_dma_seg *sg;
1529                 struct  scatterlist *cur_seg;
1530                 struct  scatterlist *end_seg;
1531                 int     nseg;
1532
1533                 cur_seg = (struct scatterlist *)cmd->request_buffer;
1534                 nseg = pci_map_sg(ahc->dev_softc, cur_seg, cmd->use_sg,
1535                                   cmd->sc_data_direction);
1536                 end_seg = cur_seg + nseg;
1537                 /* Copy the segments into the SG list. */
1538                 sg = scb->sg_list;
1539                 /*
1540                  * The sg_count may be larger than nseg if
1541                  * a transfer crosses a 32bit page.
1542                  */
1543                 while (cur_seg < end_seg) {
1544                         dma_addr_t addr;
1545                         bus_size_t len;
1546                         int consumed;
1547
1548                         addr = sg_dma_address(cur_seg);
1549                         len = sg_dma_len(cur_seg);
1550                         consumed = ahc_linux_map_seg(ahc, scb,
1551                                                      sg, addr, len);
1552                         sg += consumed;
1553                         scb->sg_count += consumed;
1554                         cur_seg++;
1555                 }
1556                 sg--;
1557                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1558
1559                 /*
1560                  * Reset the sg list pointer.
1561                  */
1562                 scb->hscb->sgptr =
1563                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1564
1565                 /*
1566                  * Copy the first SG into the "current"
1567                  * data pointer area.
1568                  */
1569                 scb->hscb->dataptr = scb->sg_list->addr;
1570                 scb->hscb->datacnt = scb->sg_list->len;
1571         } else if (cmd->request_bufflen != 0) {
1572                 struct   ahc_dma_seg *sg;
1573                 dma_addr_t addr;
1574
1575                 sg = scb->sg_list;
1576                 addr = pci_map_single(ahc->dev_softc,
1577                                       cmd->request_buffer,
1578                                       cmd->request_bufflen,
1579                                       cmd->sc_data_direction);
1580                 scb->platform_data->buf_busaddr = addr;
1581                 scb->sg_count = ahc_linux_map_seg(ahc, scb,
1582                                                   sg, addr,
1583                                                   cmd->request_bufflen);
1584                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1585
1586                 /*
1587                  * Reset the sg list pointer.
1588                  */
1589                 scb->hscb->sgptr =
1590                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1591
1592                 /*
1593                  * Copy the first SG into the "current"
1594                  * data pointer area.
1595                  */
1596                 scb->hscb->dataptr = sg->addr;
1597                 scb->hscb->datacnt = sg->len;
1598         } else {
1599                 scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1600                 scb->hscb->dataptr = 0;
1601                 scb->hscb->datacnt = 0;
1602                 scb->sg_count = 0;
1603         }
1604
1605         LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1606         dev->openings--;
1607         dev->active++;
1608         dev->commands_issued++;
1609         if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1610                 dev->commands_since_idle_or_otag++;
1611
1612         scb->flags |= SCB_ACTIVE;
1613         if (untagged_q) {
1614                 TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1615                 scb->flags |= SCB_UNTAGGEDQ;
1616         }
1617         ahc_queue_scb(ahc, scb);
1618         return 0;
1619 }
1620
1621 /*
1622  * SCSI controller interrupt handler.
1623  */
1624 irqreturn_t
1625 ahc_linux_isr(int irq, void *dev_id, struct pt_regs * regs)
1626 {
1627         struct  ahc_softc *ahc;
1628         u_long  flags;
1629         int     ours;
1630
1631         ahc = (struct ahc_softc *) dev_id;
1632         ahc_lock(ahc, &flags);
1633         ours = ahc_intr(ahc);
1634         ahc_unlock(ahc, &flags);
1635         return IRQ_RETVAL(ours);
1636 }
1637
1638 void
1639 ahc_platform_flushwork(struct ahc_softc *ahc)
1640 {
1641
1642 }
1643
1644 void
1645 ahc_send_async(struct ahc_softc *ahc, char channel,
1646                u_int target, u_int lun, ac_code code, void *arg)
1647 {
1648         switch (code) {
1649         case AC_TRANSFER_NEG:
1650         {
1651                 char    buf[80];
1652                 struct  scsi_target *starget;
1653                 struct  ahc_linux_target *targ;
1654                 struct  info_str info;
1655                 struct  ahc_initiator_tinfo *tinfo;
1656                 struct  ahc_tmode_tstate *tstate;
1657                 int     target_offset;
1658                 unsigned int target_ppr_options;
1659
1660                 BUG_ON(target == CAM_TARGET_WILDCARD);
1661
1662                 info.buffer = buf;
1663                 info.length = sizeof(buf);
1664                 info.offset = 0;
1665                 info.pos = 0;
1666                 tinfo = ahc_fetch_transinfo(ahc, channel,
1667                                                 channel == 'A' ? ahc->our_id
1668                                                                : ahc->our_id_b,
1669                                                 target, &tstate);
1670
1671                 /*
1672                  * Don't bother reporting results while
1673                  * negotiations are still pending.
1674                  */
1675                 if (tinfo->curr.period != tinfo->goal.period
1676                  || tinfo->curr.width != tinfo->goal.width
1677                  || tinfo->curr.offset != tinfo->goal.offset
1678                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1679                         if (bootverbose == 0)
1680                                 break;
1681
1682                 /*
1683                  * Don't bother reporting results that
1684                  * are identical to those last reported.
1685                  */
1686                 target_offset = target;
1687                 if (channel == 'B')
1688                         target_offset += 8;
1689                 starget = ahc->platform_data->starget[target_offset];
1690                 if (starget == NULL)
1691                         break;
1692                 targ = scsi_transport_target_data(starget);
1693
1694                 target_ppr_options =
1695                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1696                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1697                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0);
1698
1699                 if (tinfo->curr.period == spi_period(starget)
1700                     && tinfo->curr.width == spi_width(starget)
1701                     && tinfo->curr.offset == spi_offset(starget)
1702                  && tinfo->curr.ppr_options == target_ppr_options)
1703                         if (bootverbose == 0)
1704                                 break;
1705
1706                 spi_period(starget) = tinfo->curr.period;
1707                 spi_width(starget) = tinfo->curr.width;
1708                 spi_offset(starget) = tinfo->curr.offset;
1709                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1710                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1711                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1712                 spi_display_xfer_agreement(starget);
1713                 break;
1714         }
1715         case AC_SENT_BDR:
1716         {
1717                 WARN_ON(lun != CAM_LUN_WILDCARD);
1718                 scsi_report_device_reset(ahc->platform_data->host,
1719                                          channel - 'A', target);
1720                 break;
1721         }
1722         case AC_BUS_RESET:
1723                 if (ahc->platform_data->host != NULL) {
1724                         scsi_report_bus_reset(ahc->platform_data->host,
1725                                               channel - 'A');
1726                 }
1727                 break;
1728         default:
1729                 panic("ahc_send_async: Unexpected async event");
1730         }
1731 }
1732
1733 /*
1734  * Calls the higher level scsi done function and frees the scb.
1735  */
1736 void
1737 ahc_done(struct ahc_softc *ahc, struct scb *scb)
1738 {
1739         struct scsi_cmnd *cmd;
1740         struct     ahc_linux_device *dev;
1741
1742         LIST_REMOVE(scb, pending_links);
1743         if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
1744                 struct scb_tailq *untagged_q;
1745                 int target_offset;
1746
1747                 target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
1748                 untagged_q = &(ahc->untagged_queues[target_offset]);
1749                 TAILQ_REMOVE(untagged_q, scb, links.tqe);
1750                 BUG_ON(!TAILQ_EMPTY(untagged_q));
1751         }
1752
1753         if ((scb->flags & SCB_ACTIVE) == 0) {
1754                 printf("SCB %d done'd twice\n", scb->hscb->tag);
1755                 ahc_dump_card_state(ahc);
1756                 panic("Stopping for safety");
1757         }
1758         cmd = scb->io_ctx;
1759         dev = scb->platform_data->dev;
1760         dev->active--;
1761         dev->openings++;
1762         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1763                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1764                 dev->qfrozen--;
1765         }
1766         ahc_linux_unmap_scb(ahc, scb);
1767
1768         /*
1769          * Guard against stale sense data.
1770          * The Linux mid-layer assumes that sense
1771          * was retrieved anytime the first byte of
1772          * the sense buffer looks "sane".
1773          */
1774         cmd->sense_buffer[0] = 0;
1775         if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
1776                 uint32_t amount_xferred;
1777
1778                 amount_xferred =
1779                     ahc_get_transfer_length(scb) - ahc_get_residual(scb);
1780                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1781 #ifdef AHC_DEBUG
1782                         if ((ahc_debug & AHC_SHOW_MISC) != 0) {
1783                                 ahc_print_path(ahc, scb);
1784                                 printf("Set CAM_UNCOR_PARITY\n");
1785                         }
1786 #endif
1787                         ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
1788 #ifdef AHC_REPORT_UNDERFLOWS
1789                 /*
1790                  * This code is disabled by default as some
1791                  * clients of the SCSI system do not properly
1792                  * initialize the underflow parameter.  This
1793                  * results in spurious termination of commands
1794                  * that complete as expected (e.g. underflow is
1795                  * allowed as command can return variable amounts
1796                  * of data.
1797                  */
1798                 } else if (amount_xferred < scb->io_ctx->underflow) {
1799                         u_int i;
1800
1801                         ahc_print_path(ahc, scb);
1802                         printf("CDB:");
1803                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1804                                 printf(" 0x%x", scb->io_ctx->cmnd[i]);
1805                         printf("\n");
1806                         ahc_print_path(ahc, scb);
1807                         printf("Saw underflow (%ld of %ld bytes). "
1808                                "Treated as error\n",
1809                                 ahc_get_residual(scb),
1810                                 ahc_get_transfer_length(scb));
1811                         ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1812 #endif
1813                 } else {
1814                         ahc_set_transaction_status(scb, CAM_REQ_CMP);
1815                 }
1816         } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1817                 ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
1818         }
1819
1820         if (dev->openings == 1
1821          && ahc_get_transaction_status(scb) == CAM_REQ_CMP
1822          && ahc_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1823                 dev->tag_success_count++;
1824         /*
1825          * Some devices deal with temporary internal resource
1826          * shortages by returning queue full.  When the queue
1827          * full occurrs, we throttle back.  Slowly try to get
1828          * back to our previous queue depth.
1829          */
1830         if ((dev->openings + dev->active) < dev->maxtags
1831          && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
1832                 dev->tag_success_count = 0;
1833                 dev->openings++;
1834         }
1835
1836         if (dev->active == 0)
1837                 dev->commands_since_idle_or_otag = 0;
1838
1839         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1840                 printf("Recovery SCB completes\n");
1841                 if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
1842                  || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
1843                         ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1844                 if ((ahc->platform_data->flags & AHC_UP_EH_SEMAPHORE) != 0) {
1845                         ahc->platform_data->flags &= ~AHC_UP_EH_SEMAPHORE;
1846                         up(&ahc->platform_data->eh_sem);
1847                 }
1848         }
1849
1850         ahc_free_scb(ahc, scb);
1851         ahc_linux_queue_cmd_complete(ahc, cmd);
1852 }
1853
1854 static void
1855 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
1856                              struct scsi_device *sdev, struct scb *scb)
1857 {
1858         struct  ahc_devinfo devinfo;
1859         struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
1860
1861         ahc_compile_devinfo(&devinfo,
1862                             ahc->our_id,
1863                             sdev->sdev_target->id, sdev->lun,
1864                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1865                             ROLE_INITIATOR);
1866
1867         /*
1868          * We don't currently trust the mid-layer to
1869          * properly deal with queue full or busy.  So,
1870          * when one occurs, we tell the mid-layer to
1871          * unconditionally requeue the command to us
1872          * so that we can retry it ourselves.  We also
1873          * implement our own throttling mechanism so
1874          * we don't clobber the device with too many
1875          * commands.
1876          */
1877         switch (ahc_get_scsi_status(scb)) {
1878         default:
1879                 break;
1880         case SCSI_STATUS_CHECK_COND:
1881         case SCSI_STATUS_CMD_TERMINATED:
1882         {
1883                 struct scsi_cmnd *cmd;
1884
1885                 /*
1886                  * Copy sense information to the OS's cmd
1887                  * structure if it is available.
1888                  */
1889                 cmd = scb->io_ctx;
1890                 if (scb->flags & SCB_SENSE) {
1891                         u_int sense_size;
1892
1893                         sense_size = MIN(sizeof(struct scsi_sense_data)
1894                                        - ahc_get_sense_residual(scb),
1895                                          sizeof(cmd->sense_buffer));
1896                         memcpy(cmd->sense_buffer,
1897                                ahc_get_sense_buf(ahc, scb), sense_size);
1898                         if (sense_size < sizeof(cmd->sense_buffer))
1899                                 memset(&cmd->sense_buffer[sense_size], 0,
1900                                        sizeof(cmd->sense_buffer) - sense_size);
1901                         cmd->result |= (DRIVER_SENSE << 24);
1902 #ifdef AHC_DEBUG
1903                         if (ahc_debug & AHC_SHOW_SENSE) {
1904                                 int i;
1905
1906                                 printf("Copied %d bytes of sense data:",
1907                                        sense_size);
1908                                 for (i = 0; i < sense_size; i++) {
1909                                         if ((i & 0xF) == 0)
1910                                                 printf("\n");
1911                                         printf("0x%x ", cmd->sense_buffer[i]);
1912                                 }
1913                                 printf("\n");
1914                         }
1915 #endif
1916                 }
1917                 break;
1918         }
1919         case SCSI_STATUS_QUEUE_FULL:
1920         {
1921                 /*
1922                  * By the time the core driver has returned this
1923                  * command, all other commands that were queued
1924                  * to us but not the device have been returned.
1925                  * This ensures that dev->active is equal to
1926                  * the number of commands actually queued to
1927                  * the device.
1928                  */
1929                 dev->tag_success_count = 0;
1930                 if (dev->active != 0) {
1931                         /*
1932                          * Drop our opening count to the number
1933                          * of commands currently outstanding.
1934                          */
1935                         dev->openings = 0;
1936 /*
1937                         ahc_print_path(ahc, scb);
1938                         printf("Dropping tag count to %d\n", dev->active);
1939  */
1940                         if (dev->active == dev->tags_on_last_queuefull) {
1941
1942                                 dev->last_queuefull_same_count++;
1943                                 /*
1944                                  * If we repeatedly see a queue full
1945                                  * at the same queue depth, this
1946                                  * device has a fixed number of tag
1947                                  * slots.  Lock in this tag depth
1948                                  * so we stop seeing queue fulls from
1949                                  * this device.
1950                                  */
1951                                 if (dev->last_queuefull_same_count
1952                                  == AHC_LOCK_TAGS_COUNT) {
1953                                         dev->maxtags = dev->active;
1954                                         ahc_print_path(ahc, scb);
1955                                         printf("Locking max tag count at %d\n",
1956                                                dev->active);
1957                                 }
1958                         } else {
1959                                 dev->tags_on_last_queuefull = dev->active;
1960                                 dev->last_queuefull_same_count = 0;
1961                         }
1962                         ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
1963                         ahc_set_scsi_status(scb, SCSI_STATUS_OK);
1964                         ahc_platform_set_tags(ahc, &devinfo,
1965                                      (dev->flags & AHC_DEV_Q_BASIC)
1966                                    ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1967                         break;
1968                 }
1969                 /*
1970                  * Drop down to a single opening, and treat this
1971                  * as if the target returned BUSY SCSI status.
1972                  */
1973                 dev->openings = 1;
1974                 ahc_set_scsi_status(scb, SCSI_STATUS_BUSY);
1975                 ahc_platform_set_tags(ahc, &devinfo,
1976                              (dev->flags & AHC_DEV_Q_BASIC)
1977                            ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1978                 break;
1979         }
1980         }
1981 }
1982
1983 static void
1984 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
1985 {
1986         /*
1987          * Map CAM error codes into Linux Error codes.  We
1988          * avoid the conversion so that the DV code has the
1989          * full error information available when making
1990          * state change decisions.
1991          */
1992         {
1993                 u_int new_status;
1994
1995                 switch (ahc_cmd_get_transaction_status(cmd)) {
1996                 case CAM_REQ_INPROG:
1997                 case CAM_REQ_CMP:
1998                 case CAM_SCSI_STATUS_ERROR:
1999                         new_status = DID_OK;
2000                         break;
2001                 case CAM_REQ_ABORTED:
2002                         new_status = DID_ABORT;
2003                         break;
2004                 case CAM_BUSY:
2005                         new_status = DID_BUS_BUSY;
2006                         break;
2007                 case CAM_REQ_INVALID:
2008                 case CAM_PATH_INVALID:
2009                         new_status = DID_BAD_TARGET;
2010                         break;
2011                 case CAM_SEL_TIMEOUT:
2012                         new_status = DID_NO_CONNECT;
2013                         break;
2014                 case CAM_SCSI_BUS_RESET:
2015                 case CAM_BDR_SENT:
2016                         new_status = DID_RESET;
2017                         break;
2018                 case CAM_UNCOR_PARITY:
2019                         new_status = DID_PARITY;
2020                         break;
2021                 case CAM_CMD_TIMEOUT:
2022                         new_status = DID_TIME_OUT;
2023                         break;
2024                 case CAM_UA_ABORT:
2025                 case CAM_REQ_CMP_ERR:
2026                 case CAM_AUTOSENSE_FAIL:
2027                 case CAM_NO_HBA:
2028                 case CAM_DATA_RUN_ERR:
2029                 case CAM_UNEXP_BUSFREE:
2030                 case CAM_SEQUENCE_FAIL:
2031                 case CAM_CCB_LEN_ERR:
2032                 case CAM_PROVIDE_FAIL:
2033                 case CAM_REQ_TERMIO:
2034                 case CAM_UNREC_HBA_ERROR:
2035                 case CAM_REQ_TOO_BIG:
2036                         new_status = DID_ERROR;
2037                         break;
2038                 case CAM_REQUEUE_REQ:
2039                         new_status = DID_REQUEUE;
2040                         break;
2041                 default:
2042                         /* We should never get here */
2043                         new_status = DID_ERROR;
2044                         break;
2045                 }
2046
2047                 ahc_cmd_set_transaction_status(cmd, new_status);
2048         }
2049
2050         cmd->scsi_done(cmd);
2051 }
2052
2053 static void
2054 ahc_linux_sem_timeout(u_long arg)
2055 {
2056         struct  ahc_softc *ahc;
2057         u_long  s;
2058
2059         ahc = (struct ahc_softc *)arg;
2060
2061         ahc_lock(ahc, &s);
2062         if ((ahc->platform_data->flags & AHC_UP_EH_SEMAPHORE) != 0) {
2063                 ahc->platform_data->flags &= ~AHC_UP_EH_SEMAPHORE;
2064                 up(&ahc->platform_data->eh_sem);
2065         }
2066         ahc_unlock(ahc, &s);
2067 }
2068
2069 static void
2070 ahc_linux_freeze_simq(struct ahc_softc *ahc)
2071 {
2072         ahc->platform_data->qfrozen++;
2073         if (ahc->platform_data->qfrozen == 1) {
2074                 scsi_block_requests(ahc->platform_data->host);
2075
2076                 /* XXX What about Twin channels? */
2077                 ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2078                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
2079                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
2080         }
2081 }
2082
2083 static void
2084 ahc_linux_release_simq(u_long arg)
2085 {
2086         struct ahc_softc *ahc;
2087         u_long s;
2088         int    unblock_reqs;
2089
2090         ahc = (struct ahc_softc *)arg;
2091
2092         unblock_reqs = 0;
2093         ahc_lock(ahc, &s);
2094         if (ahc->platform_data->qfrozen > 0)
2095                 ahc->platform_data->qfrozen--;
2096         if (ahc->platform_data->qfrozen == 0)
2097                 unblock_reqs = 1;
2098         ahc_unlock(ahc, &s);
2099         /*
2100          * There is still a race here.  The mid-layer
2101          * should keep its own freeze count and use
2102          * a bottom half handler to run the queues
2103          * so we can unblock with our own lock held.
2104          */
2105         if (unblock_reqs)
2106                 scsi_unblock_requests(ahc->platform_data->host);
2107 }
2108
2109 static int
2110 ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2111 {
2112         struct ahc_softc *ahc;
2113         struct ahc_linux_device *dev;
2114         struct scb *pending_scb;
2115         u_int  saved_scbptr;
2116         u_int  active_scb_index;
2117         u_int  last_phase;
2118         u_int  saved_scsiid;
2119         u_int  cdb_byte;
2120         int    retval;
2121         int    was_paused;
2122         int    paused;
2123         int    wait;
2124         int    disconnected;
2125
2126         pending_scb = NULL;
2127         paused = FALSE;
2128         wait = FALSE;
2129         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
2130
2131         printf("%s:%d:%d:%d: Attempting to queue a%s message\n",
2132                ahc_name(ahc), cmd->device->channel,
2133                cmd->device->id, cmd->device->lun,
2134                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2135
2136         printf("CDB:");
2137         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2138                 printf(" 0x%x", cmd->cmnd[cdb_byte]);
2139         printf("\n");
2140
2141         spin_lock_irq(&ahc->platform_data->spin_lock);
2142
2143         /*
2144          * First determine if we currently own this command.
2145          * Start by searching the device queue.  If not found
2146          * there, check the pending_scb list.  If not found
2147          * at all, and the system wanted us to just abort the
2148          * command, return success.
2149          */
2150         dev = scsi_transport_device_data(cmd->device);
2151
2152         if (dev == NULL) {
2153                 /*
2154                  * No target device for this command exists,
2155                  * so we must not still own the command.
2156                  */
2157                 printf("%s:%d:%d:%d: Is not an active device\n",
2158                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2159                        cmd->device->lun);
2160                 retval = SUCCESS;
2161                 goto no_cmd;
2162         }
2163
2164         if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2165          && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
2166                                        cmd->device->channel + 'A',
2167                                        cmd->device->lun,
2168                                        CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
2169                 printf("%s:%d:%d:%d: Command found on untagged queue\n",
2170                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2171                        cmd->device->lun);
2172                 retval = SUCCESS;
2173                 goto done;
2174         }
2175
2176         /*
2177          * See if we can find a matching cmd in the pending list.
2178          */
2179         LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2180                 if (pending_scb->io_ctx == cmd)
2181                         break;
2182         }
2183
2184         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2185
2186                 /* Any SCB for this device will do for a target reset */
2187                 LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2188                         if (ahc_match_scb(ahc, pending_scb, cmd->device->id,
2189                                           cmd->device->channel + 'A',
2190                                           CAM_LUN_WILDCARD,
2191                                           SCB_LIST_NULL, ROLE_INITIATOR) == 0)
2192                                 break;
2193                 }
2194         }
2195
2196         if (pending_scb == NULL) {
2197                 printf("%s:%d:%d:%d: Command not found\n",
2198                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2199                        cmd->device->lun);
2200                 goto no_cmd;
2201         }
2202
2203         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2204                 /*
2205                  * We can't queue two recovery actions using the same SCB
2206                  */
2207                 retval = FAILED;
2208                 goto  done;
2209         }
2210
2211         /*
2212          * Ensure that the card doesn't do anything
2213          * behind our back and that we didn't "just" miss
2214          * an interrupt that would affect this cmd.
2215          */
2216         was_paused = ahc_is_paused(ahc);
2217         ahc_pause_and_flushwork(ahc);
2218         paused = TRUE;
2219
2220         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2221                 printf("%s:%d:%d:%d: Command already completed\n",
2222                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2223                        cmd->device->lun);
2224                 goto no_cmd;
2225         }
2226
2227         printf("%s: At time of recovery, card was %spaused\n",
2228                ahc_name(ahc), was_paused ? "" : "not ");
2229         ahc_dump_card_state(ahc);
2230
2231         disconnected = TRUE;
2232         if (flag == SCB_ABORT) {
2233                 if (ahc_search_qinfifo(ahc, cmd->device->id,
2234                                        cmd->device->channel + 'A',
2235                                        cmd->device->lun,
2236                                        pending_scb->hscb->tag,
2237                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2238                                        SEARCH_COMPLETE) > 0) {
2239                         printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2240                                ahc_name(ahc), cmd->device->channel,
2241                                         cmd->device->id, cmd->device->lun);
2242                         retval = SUCCESS;
2243                         goto done;
2244                 }
2245         } else if (ahc_search_qinfifo(ahc, cmd->device->id,
2246                                       cmd->device->channel + 'A',
2247                                       cmd->device->lun, pending_scb->hscb->tag,
2248                                       ROLE_INITIATOR, /*status*/0,
2249                                       SEARCH_COUNT) > 0) {
2250                 disconnected = FALSE;
2251         }
2252
2253         if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2254                 struct scb *bus_scb;
2255
2256                 bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
2257                 if (bus_scb == pending_scb)
2258                         disconnected = FALSE;
2259                 else if (flag != SCB_ABORT
2260                       && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2261                       && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2262                         disconnected = FALSE;
2263         }
2264
2265         /*
2266          * At this point, pending_scb is the scb associated with the
2267          * passed in command.  That command is currently active on the
2268          * bus, is in the disconnected state, or we're hoping to find
2269          * a command for the same target active on the bus to abuse to
2270          * send a BDR.  Queue the appropriate message based on which of
2271          * these states we are in.
2272          */
2273         last_phase = ahc_inb(ahc, LASTPHASE);
2274         saved_scbptr = ahc_inb(ahc, SCBPTR);
2275         active_scb_index = ahc_inb(ahc, SCB_TAG);
2276         saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2277         if (last_phase != P_BUSFREE
2278          && (pending_scb->hscb->tag == active_scb_index
2279           || (flag == SCB_DEVICE_RESET
2280            && SCSIID_TARGET(ahc, saved_scsiid) == cmd->device->id))) {
2281
2282                 /*
2283                  * We're active on the bus, so assert ATN
2284                  * and hope that the target responds.
2285                  */
2286                 pending_scb = ahc_lookup_scb(ahc, active_scb_index);
2287                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2288                 ahc_outb(ahc, MSG_OUT, HOST_MSG);
2289                 ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2290                 printf("%s:%d:%d:%d: Device is active, asserting ATN\n",
2291                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2292                        cmd->device->lun);
2293                 wait = TRUE;
2294         } else if (disconnected) {
2295
2296                 /*
2297                  * Actually re-queue this SCB in an attempt
2298                  * to select the device before it reconnects.
2299                  * In either case (selection or reselection),
2300                  * we will now issue the approprate message
2301                  * to the timed-out device.
2302                  *
2303                  * Set the MK_MESSAGE control bit indicating
2304                  * that we desire to send a message.  We
2305                  * also set the disconnected flag since
2306                  * in the paging case there is no guarantee
2307                  * that our SCB control byte matches the
2308                  * version on the card.  We don't want the
2309                  * sequencer to abort the command thinking
2310                  * an unsolicited reselection occurred.
2311                  */
2312                 pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2313                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2314
2315                 /*
2316                  * Remove any cached copy of this SCB in the
2317                  * disconnected list in preparation for the
2318                  * queuing of our abort SCB.  We use the
2319                  * same element in the SCB, SCB_NEXT, for
2320                  * both the qinfifo and the disconnected list.
2321                  */
2322                 ahc_search_disc_list(ahc, cmd->device->id,
2323                                      cmd->device->channel + 'A',
2324                                      cmd->device->lun, pending_scb->hscb->tag,
2325                                      /*stop_on_first*/TRUE,
2326                                      /*remove*/TRUE,
2327                                      /*save_state*/FALSE);
2328
2329                 /*
2330                  * In the non-paging case, the sequencer will
2331                  * never re-reference the in-core SCB.
2332                  * To make sure we are notified during
2333                  * reslection, set the MK_MESSAGE flag in
2334                  * the card's copy of the SCB.
2335                  */
2336                 if ((ahc->flags & AHC_PAGESCBS) == 0) {
2337                         ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2338                         ahc_outb(ahc, SCB_CONTROL,
2339                                  ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2340                 }
2341
2342                 /*
2343                  * Clear out any entries in the QINFIFO first
2344                  * so we are the next SCB for this target
2345                  * to run.
2346                  */
2347                 ahc_search_qinfifo(ahc, cmd->device->id,
2348                                    cmd->device->channel + 'A',
2349                                    cmd->device->lun, SCB_LIST_NULL,
2350                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
2351                                    SEARCH_COMPLETE);
2352                 ahc_qinfifo_requeue_tail(ahc, pending_scb);
2353                 ahc_outb(ahc, SCBPTR, saved_scbptr);
2354                 ahc_print_path(ahc, pending_scb);
2355                 printf("Device is disconnected, re-queuing SCB\n");
2356                 wait = TRUE;
2357         } else {
2358                 printf("%s:%d:%d:%d: Unable to deliver message\n",
2359                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2360                        cmd->device->lun);
2361                 retval = FAILED;
2362                 goto done;
2363         }
2364
2365 no_cmd:
2366         /*
2367          * Our assumption is that if we don't have the command, no
2368          * recovery action was required, so we return success.  Again,
2369          * the semantics of the mid-layer recovery engine are not
2370          * well defined, so this may change in time.
2371          */
2372         retval = SUCCESS;
2373 done:
2374         if (paused)
2375                 ahc_unpause(ahc);
2376         if (wait) {
2377                 struct timer_list timer;
2378                 int ret;
2379
2380                 ahc->platform_data->flags |= AHC_UP_EH_SEMAPHORE;
2381                 spin_unlock_irq(&ahc->platform_data->spin_lock);
2382                 init_timer(&timer);
2383                 timer.data = (u_long)ahc;
2384                 timer.expires = jiffies + (5 * HZ);
2385                 timer.function = ahc_linux_sem_timeout;
2386                 add_timer(&timer);
2387                 printf("Recovery code sleeping\n");
2388                 down(&ahc->platform_data->eh_sem);
2389                 printf("Recovery code awake\n");
2390                 ret = del_timer_sync(&timer);
2391                 if (ret == 0) {
2392                         printf("Timer Expired\n");
2393                         retval = FAILED;
2394                 }
2395                 spin_lock_irq(&ahc->platform_data->spin_lock);
2396         }
2397
2398         spin_unlock_irq(&ahc->platform_data->spin_lock);
2399         return (retval);
2400 }
2401
2402 void
2403 ahc_platform_dump_card_state(struct ahc_softc *ahc)
2404 {
2405 }
2406
2407 static void ahc_linux_set_width(struct scsi_target *starget, int width)
2408 {
2409         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2410         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2411         struct ahc_devinfo devinfo;
2412         unsigned long flags;
2413
2414         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2415                             starget->channel + 'A', ROLE_INITIATOR);
2416         ahc_lock(ahc, &flags);
2417         ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
2418         ahc_unlock(ahc, &flags);
2419 }
2420
2421 static void ahc_linux_set_period(struct scsi_target *starget, int period)
2422 {
2423         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2424         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2425         struct ahc_tmode_tstate *tstate;
2426         struct ahc_initiator_tinfo *tinfo
2427                 = ahc_fetch_transinfo(ahc,
2428                                       starget->channel + 'A',
2429                                       shost->this_id, starget->id, &tstate);
2430         struct ahc_devinfo devinfo;
2431         unsigned int ppr_options = tinfo->goal.ppr_options;
2432         unsigned long flags;
2433         unsigned long offset = tinfo->goal.offset;
2434         struct ahc_syncrate *syncrate;
2435
2436         if (offset == 0)
2437                 offset = MAX_OFFSET;
2438
2439         if (period < 9)
2440                 period = 9;     /* 12.5ns is our minimum */
2441         if (period == 9)
2442                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2443
2444         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2445                             starget->channel + 'A', ROLE_INITIATOR);
2446
2447         /* all PPR requests apart from QAS require wide transfers */
2448         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2449                 if (spi_width(starget) == 0)
2450                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2451         }
2452
2453         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2454         ahc_lock(ahc, &flags);
2455         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2456                          ppr_options, AHC_TRANS_GOAL, FALSE);
2457         ahc_unlock(ahc, &flags);
2458 }
2459
2460 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2461 {
2462         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2463         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2464         struct ahc_tmode_tstate *tstate;
2465         struct ahc_initiator_tinfo *tinfo
2466                 = ahc_fetch_transinfo(ahc,
2467                                       starget->channel + 'A',
2468                                       shost->this_id, starget->id, &tstate);
2469         struct ahc_devinfo devinfo;
2470         unsigned int ppr_options = 0;
2471         unsigned int period = 0;
2472         unsigned long flags;
2473         struct ahc_syncrate *syncrate = NULL;
2474
2475         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2476                             starget->channel + 'A', ROLE_INITIATOR);
2477         if (offset != 0) {
2478                 syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2479                 period = tinfo->goal.period;
2480                 ppr_options = tinfo->goal.ppr_options;
2481         }
2482         ahc_lock(ahc, &flags);
2483         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2484                          ppr_options, AHC_TRANS_GOAL, FALSE);
2485         ahc_unlock(ahc, &flags);
2486 }
2487
2488 static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
2489 {
2490         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2491         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2492         struct ahc_tmode_tstate *tstate;
2493         struct ahc_initiator_tinfo *tinfo
2494                 = ahc_fetch_transinfo(ahc,
2495                                       starget->channel + 'A',
2496                                       shost->this_id, starget->id, &tstate);
2497         struct ahc_devinfo devinfo;
2498         unsigned int ppr_options = tinfo->goal.ppr_options
2499                 & ~MSG_EXT_PPR_DT_REQ;
2500         unsigned int period = tinfo->goal.period;
2501         unsigned int width = tinfo->goal.width;
2502         unsigned long flags;
2503         struct ahc_syncrate *syncrate;
2504
2505         if (dt) {
2506                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2507                 if (!width)
2508                         ahc_linux_set_width(starget, 1);
2509         } else if (period == 9)
2510                 period = 10;    /* if resetting DT, period must be >= 25ns */
2511
2512         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2513                             starget->channel + 'A', ROLE_INITIATOR);
2514         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,AHC_SYNCRATE_DT);
2515         ahc_lock(ahc, &flags);
2516         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2517                          ppr_options, AHC_TRANS_GOAL, FALSE);
2518         ahc_unlock(ahc, &flags);
2519 }
2520
2521 #if 0
2522 /* FIXME: This code claims to support IU and QAS.  However, the actual
2523  * sequencer code and aic7xxx_core have no support for these parameters and
2524  * will get into a bad state if they're negotiated.  Do not enable this
2525  * unless you know what you're doing */
2526 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2527 {
2528         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2529         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2530         struct ahc_tmode_tstate *tstate;
2531         struct ahc_initiator_tinfo *tinfo
2532                 = ahc_fetch_transinfo(ahc,
2533                                       starget->channel + 'A',
2534                                       shost->this_id, starget->id, &tstate);
2535         struct ahc_devinfo devinfo;
2536         unsigned int ppr_options = tinfo->goal.ppr_options
2537                 & ~MSG_EXT_PPR_QAS_REQ;
2538         unsigned int period = tinfo->goal.period;
2539         unsigned long flags;
2540         struct ahc_syncrate *syncrate;
2541
2542         if (qas)
2543                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2544
2545         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2546                             starget->channel + 'A', ROLE_INITIATOR);
2547         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2548         ahc_lock(ahc, &flags);
2549         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2550                          ppr_options, AHC_TRANS_GOAL, FALSE);
2551         ahc_unlock(ahc, &flags);
2552 }
2553
2554 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
2555 {
2556         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2557         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2558         struct ahc_tmode_tstate *tstate;
2559         struct ahc_initiator_tinfo *tinfo
2560                 = ahc_fetch_transinfo(ahc,
2561                                       starget->channel + 'A',
2562                                       shost->this_id, starget->id, &tstate);
2563         struct ahc_devinfo devinfo;
2564         unsigned int ppr_options = tinfo->goal.ppr_options
2565                 & ~MSG_EXT_PPR_IU_REQ;
2566         unsigned int period = tinfo->goal.period;
2567         unsigned long flags;
2568         struct ahc_syncrate *syncrate;
2569
2570         if (iu)
2571                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2572
2573         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2574                             starget->channel + 'A', ROLE_INITIATOR);
2575         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2576         ahc_lock(ahc, &flags);
2577         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2578                          ppr_options, AHC_TRANS_GOAL, FALSE);
2579         ahc_unlock(ahc, &flags);
2580 }
2581 #endif
2582
2583 static struct spi_function_template ahc_linux_transport_functions = {
2584         .set_offset     = ahc_linux_set_offset,
2585         .show_offset    = 1,
2586         .set_period     = ahc_linux_set_period,
2587         .show_period    = 1,
2588         .set_width      = ahc_linux_set_width,
2589         .show_width     = 1,
2590         .set_dt         = ahc_linux_set_dt,
2591         .show_dt        = 1,
2592 #if 0
2593         .set_iu         = ahc_linux_set_iu,
2594         .show_iu        = 1,
2595         .set_qas        = ahc_linux_set_qas,
2596         .show_qas       = 1,
2597 #endif
2598 };
2599
2600
2601
2602 static int __init
2603 ahc_linux_init(void)
2604 {
2605         /*
2606          * If we've been passed any parameters, process them now.
2607          */
2608         if (aic7xxx)
2609                 aic7xxx_setup(aic7xxx);
2610
2611         ahc_linux_transport_template =
2612                 spi_attach_transport(&ahc_linux_transport_functions);
2613         if (!ahc_linux_transport_template)
2614                 return -ENODEV;
2615
2616         scsi_transport_reserve_target(ahc_linux_transport_template,
2617                                       sizeof(struct ahc_linux_target));
2618         scsi_transport_reserve_device(ahc_linux_transport_template,
2619                                       sizeof(struct ahc_linux_device));
2620
2621         ahc_linux_pci_init();
2622         ahc_linux_eisa_init();
2623         return 0;
2624 }
2625
2626 static void
2627 ahc_linux_exit(void)
2628 {
2629         ahc_linux_pci_exit();
2630         ahc_linux_eisa_exit();
2631         spi_release_transport(ahc_linux_transport_template);
2632 }
2633
2634 module_init(ahc_linux_init);
2635 module_exit(ahc_linux_exit);