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   1 /*
   2  *  linux/drivers/acorn/scsi/fas216.c
   3  *
   4  *  Copyright (C) 1997-2003 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * Based on information in qlogicfas.c by Tom Zerucha, Michael Griffith, and
  11  * other sources, including:
  12  *   the AMD Am53CF94 data sheet
  13  *   the AMD Am53C94 data sheet
  14  *
  15  * This is a generic driver.  To use it, have a look at cumana_2.c.  You
  16  * should define your own structure that overlays FAS216_Info, eg:
  17  * struct my_host_data {
  18  *    FAS216_Info info;
  19  *    ... my host specific data ...
  20  * };
  21  *
  22  * Changelog:
  23  *  30-08-1997  RMK     Created
  24  *  14-09-1997  RMK     Started disconnect support
  25  *  08-02-1998  RMK     Corrected real DMA support
  26  *  15-02-1998  RMK     Started sync xfer support
  27  *  06-04-1998  RMK     Tightened conditions for printing incomplete
  28  *                      transfers
  29  *  02-05-1998  RMK     Added extra checks in fas216_reset
  30  *  24-05-1998  RMK     Fixed synchronous transfers with period >= 200ns
  31  *  27-06-1998  RMK     Changed asm/delay.h to linux/delay.h
  32  *  26-08-1998  RMK     Improved message support wrt MESSAGE_REJECT
  33  *  02-04-2000  RMK     Converted to use the new error handling, and
  34  *                      automatically request sense data upon check
  35  *                      condition status from targets.
  36  */
  37 #include <linux/module.h>
  38 #include <linux/blkdev.h>
  39 #include <linux/kernel.h>
  40 #include <linux/string.h>
  41 #include <linux/ioport.h>
  42 #include <linux/sched.h>
  43 #include <linux/proc_fs.h>
  44 #include <linux/delay.h>
  45 #include <linux/bitops.h>
  46 #include <linux/init.h>
  47 #include <linux/interrupt.h>
  48
  49 #include <asm/dma.h>
  50 #include <asm/io.h>
  51 #include <asm/irq.h>
  52 #include <asm/ecard.h>
  53
  54 #include "../scsi.h"
  55 #include <scsi/scsi_dbg.h>
  56 #include <scsi/scsi_host.h>
  57 #include "fas216.h"
  58 #include "scsi.h"
  59
  60 /* NOTE: SCSI2 Synchronous transfers *require* DMA according to
  61  *  the data sheet.  This restriction is crazy, especially when
  62  *  you only want to send 16 bytes!  What were the guys who
  63  *  designed this chip on at that time?  Did they read the SCSI2
  64  *  spec at all?  The following sections are taken from the SCSI2
  65  *  standard (s2r10) concerning this:
  66  *
  67  * > IMPLEMENTORS NOTES:
  68  * >   (1)  Re-negotiation at every selection is not recommended, since a
  69  * >   significant performance impact is likely.
  70  *
  71  * >  The implied synchronous agreement shall remain in effect until a BUS DEVICE
  72  * >  RESET message is received, until a hard reset condition occurs, or until one
  73  * >  of the two SCSI devices elects to modify the agreement.  The default data
  74  * >  transfer mode is asynchronous data transfer mode.  The default data transfer
  75  * >  mode is entered at power on, after a BUS DEVICE RESET message, or after a hard
  76  * >  reset condition.
  77  *
  78  *  In total, this means that once you have elected to use synchronous
  79  *  transfers, you must always use DMA.
  80  *
  81  *  I was thinking that this was a good chip until I found this restriction ;(
  82  */
  83 #define SCSI2_SYNC
  84 #undef  SCSI2_TAG
  85
  86 #undef DEBUG_CONNECT
  87 #undef DEBUG_MESSAGES
  88
  89 #undef CHECK_STRUCTURE
  90
  91 #define LOG_CONNECT             (1 << 0)
  92 #define LOG_BUSSERVICE          (1 << 1)
  93 #define LOG_FUNCTIONDONE        (1 << 2)
  94 #define LOG_MESSAGES            (1 << 3)
  95 #define LOG_BUFFER              (1 << 4)
  96 #define LOG_ERROR               (1 << 8)
  97
  98 static int level_mask = LOG_ERROR;
  99
 100 module_param(level_mask, int, 0644);
 101
 102 static int __init fas216_log_setup(char *str)
 103 {
 104         char *s;
 105
 106         level_mask = 0;
 107
 108         while ((s = strsep(&str, ",")) != NULL) {
 109                 switch (s[0]) {
 110                 case 'a':
 111                         if (strcmp(s, "all") == 0)
 112                                 level_mask |= -1;
 113                         break;
 114                 case 'b':
 115                         if (strncmp(s, "bus", 3) == 0)
 116                                 level_mask |= LOG_BUSSERVICE;
 117                         if (strncmp(s, "buf", 3) == 0)
 118                                 level_mask |= LOG_BUFFER;
 119                         break;
 120                 case 'c':
 121                         level_mask |= LOG_CONNECT;
 122                         break;
 123                 case 'e':
 124                         level_mask |= LOG_ERROR;
 125                         break;
 126                 case 'm':
 127                         level_mask |= LOG_MESSAGES;
 128                         break;
 129                 case 'n':
 130                         if (strcmp(s, "none") == 0)
 131                                 level_mask = 0;
 132                         break;
 133                 case 's':
 134                         level_mask |= LOG_FUNCTIONDONE;
 135                         break;
 136                 }
 137         }
 138         return 1;
 139 }
 140
 141 __setup("fas216_logging=", fas216_log_setup);
 142
 143 static inline unsigned char fas216_readb(FAS216_Info *info, unsigned int reg)
 144 {
 145         unsigned int off = reg << info->scsi.io_shift;
 146         return readb(info->scsi.io_base + off);
 147 }
 148
 149 static inline void fas216_writeb(FAS216_Info *info, unsigned int reg, unsigned int val)
 150 {
 151         unsigned int off = reg << info->scsi.io_shift;
 152         writeb(val, info->scsi.io_base + off);
 153 }
 154
 155 static void fas216_dumpstate(FAS216_Info *info)
 156 {
 157         unsigned char is, stat, inst;
 158
 159         is   = fas216_readb(info, REG_IS);
 160         stat = fas216_readb(info, REG_STAT);
 161         inst = fas216_readb(info, REG_INST);
 162
 163         printk("FAS216: CTCL=%02X CTCM=%02X CMD=%02X STAT=%02X"
 164                " INST=%02X IS=%02X CFIS=%02X",
 165                 fas216_readb(info, REG_CTCL),
 166                 fas216_readb(info, REG_CTCM),
 167                 fas216_readb(info, REG_CMD),  stat, inst, is,
 168                 fas216_readb(info, REG_CFIS));
 169         printk(" CNTL1=%02X CNTL2=%02X CNTL3=%02X CTCH=%02X\n",
 170                 fas216_readb(info, REG_CNTL1),
 171                 fas216_readb(info, REG_CNTL2),
 172                 fas216_readb(info, REG_CNTL3),
 173                 fas216_readb(info, REG_CTCH));
 174 }
 175
 176 static void print_SCp(struct scsi_pointer *SCp, const char *prefix, const char *suffix)
 177 {
 178         printk("%sptr %p this_residual 0x%x buffer %p buffers_residual 0x%x%s",
 179                 prefix, SCp->ptr, SCp->this_residual, SCp->buffer,
 180                 SCp->buffers_residual, suffix);
 181 }
 182
 183 static void fas216_dumpinfo(FAS216_Info *info)
 184 {
 185         static int used = 0;
 186         int i;
 187
 188         if (used++)
 189                 return;
 190
 191         printk("FAS216_Info=\n");
 192         printk("  { magic_start=%lX host=%p SCpnt=%p origSCpnt=%p\n",
 193                 info->magic_start, info->host, info->SCpnt,
 194                 info->origSCpnt);
 195         printk("    scsi={ io_shift=%X irq=%X cfg={ %X %X %X %X }\n",
 196                 info->scsi.io_shift, info->scsi.irq,
 197                 info->scsi.cfg[0], info->scsi.cfg[1], info->scsi.cfg[2],
 198                 info->scsi.cfg[3]);
 199         printk("           type=%p phase=%X\n",
 200                 info->scsi.type, info->scsi.phase);
 201         print_SCp(&info->scsi.SCp, "           SCp={ ", " }\n");
 202         printk("      msgs async_stp=%X disconnectable=%d aborting=%d }\n",
 203                 info->scsi.async_stp,
 204                 info->scsi.disconnectable, info->scsi.aborting);
 205         printk("    stats={ queues=%X removes=%X fins=%X reads=%X writes=%X miscs=%X\n"
 206                "            disconnects=%X aborts=%X bus_resets=%X host_resets=%X}\n",
 207                 info->stats.queues, info->stats.removes, info->stats.fins,
 208                 info->stats.reads, info->stats.writes, info->stats.miscs,
 209                 info->stats.disconnects, info->stats.aborts, info->stats.bus_resets,
 210                 info->stats.host_resets);
 211         printk("    ifcfg={ clockrate=%X select_timeout=%X asyncperiod=%X sync_max_depth=%X }\n",
 212                 info->ifcfg.clockrate, info->ifcfg.select_timeout,
 213                 info->ifcfg.asyncperiod, info->ifcfg.sync_max_depth);
 214         for (i = 0; i < 8; i++) {
 215                 printk("    busyluns[%d]=%08lx dev[%d]={ disconnect_ok=%d stp=%X sof=%X sync_state=%X }\n",
 216                         i, info->busyluns[i], i,
 217                         info->device[i].disconnect_ok, info->device[i].stp,
 218                         info->device[i].sof, info->device[i].sync_state);
 219         }
 220         printk("    dma={ transfer_type=%X setup=%p pseudo=%p stop=%p }\n",
 221                 info->dma.transfer_type, info->dma.setup,
 222                 info->dma.pseudo, info->dma.stop);
 223         printk("    internal_done=%X magic_end=%lX }\n",
 224                 info->internal_done, info->magic_end);
 225 }
 226
 227 #ifdef CHECK_STRUCTURE
 228 static void __fas216_checkmagic(FAS216_Info *info, const char *func)
 229 {
 230         int corruption = 0;
 231         if (info->magic_start != MAGIC) {
 232                 printk(KERN_CRIT "FAS216 Error: magic at start corrupted\n");
 233                 corruption++;
 234         }
 235         if (info->magic_end != MAGIC) {
 236                 printk(KERN_CRIT "FAS216 Error: magic at end corrupted\n");
 237                 corruption++;
 238         }
 239         if (corruption) {
 240                 fas216_dumpinfo(info);
 241                 panic("scsi memory space corrupted in %s", func);
 242         }
 243 }
 244 #define fas216_checkmagic(info) __fas216_checkmagic((info), __FUNCTION__)
 245 #else
 246 #define fas216_checkmagic(info)
 247 #endif
 248
 249 static const char *fas216_bus_phase(int stat)
 250 {
 251         static const char *phases[] = {
 252                 "DATA OUT", "DATA IN",
 253                 "COMMAND", "STATUS",
 254                 "MISC OUT", "MISC IN",
 255                 "MESG OUT", "MESG IN"
 256         };
 257
 258         return phases[stat & STAT_BUSMASK];
 259 }
 260
 261 static const char *fas216_drv_phase(FAS216_Info *info)
 262 {
 263         static const char *phases[] = {
 264                 [PHASE_IDLE]            = "idle",
 265                 [PHASE_SELECTION]       = "selection",
 266                 [PHASE_COMMAND]         = "command",
 267                 [PHASE_DATAOUT]         = "data out",
 268                 [PHASE_DATAIN]          = "data in",
 269                 [PHASE_MSGIN]           = "message in",
 270                 [PHASE_MSGIN_DISCONNECT]= "disconnect",
 271                 [PHASE_MSGOUT_EXPECT]   = "expect message out",
 272                 [PHASE_MSGOUT]          = "message out",
 273                 [PHASE_STATUS]          = "status",
 274                 [PHASE_DONE]            = "done",
 275         };
 276
 277         if (info->scsi.phase < ARRAY_SIZE(phases) &&
 278             phases[info->scsi.phase])
 279                 return phases[info->scsi.phase];
 280         return "???";
 281 }
 282
 283 static char fas216_target(FAS216_Info *info)
 284 {
 285         if (info->SCpnt)
 286                 return '0' + info->SCpnt->device->id;
 287         else
 288                 return 'H';
 289 }
 290
 291 static void
 292 fas216_do_log(FAS216_Info *info, char target, char *fmt, va_list ap)
 293 {
 294         static char buf[1024];
 295
 296         vsnprintf(buf, sizeof(buf), fmt, ap);
 297         printk("scsi%d.%c: %s", info->host->host_no, target, buf);
 298 }
 299
 300 static void
 301 fas216_log_command(FAS216_Info *info, int level, Scsi_Cmnd *SCpnt, char *fmt, ...)
 302 {
 303         va_list args;
 304
 305         if (level != 0 && !(level & level_mask))
 306                 return;
 307
 308         va_start(args, fmt);
 309         fas216_do_log(info, '0' + SCpnt->device->id, fmt, args);
 310         va_end(args);
 311
 312         printk(" CDB: ");
 313         __scsi_print_command(SCpnt->cmnd);
 314 }
 315
 316 static void
 317 fas216_log_target(FAS216_Info *info, int level, int target, char *fmt, ...)
 318 {
 319         va_list args;
 320
 321         if (level != 0 && !(level & level_mask))
 322                 return;
 323
 324         if (target < 0)
 325                 target = 'H';
 326         else
 327                 target += '0';
 328
 329         va_start(args, fmt);
 330         fas216_do_log(info, target, fmt, args);
 331         va_end(args);
 332
 333         printk("\n");
 334 }
 335
 336 static void fas216_log(FAS216_Info *info, int level, char *fmt, ...)
 337 {
 338         va_list args;
 339
 340         if (level != 0 && !(level & level_mask))
 341                 return;
 342
 343         va_start(args, fmt);
 344         fas216_do_log(info, fas216_target(info), fmt, args);
 345         va_end(args);
 346
 347         printk("\n");
 348 }
 349
 350 #define PH_SIZE 32
 351
 352 static struct { int stat, ssr, isr, ph; } ph_list[PH_SIZE];
 353 static int ph_ptr;
 354
 355 static void add_debug_list(int stat, int ssr, int isr, int ph)
 356 {
 357         ph_list[ph_ptr].stat = stat;
 358         ph_list[ph_ptr].ssr = ssr;
 359         ph_list[ph_ptr].isr = isr;
 360         ph_list[ph_ptr].ph = ph;
 361
 362         ph_ptr = (ph_ptr + 1) & (PH_SIZE-1);
 363 }
 364
 365 static struct { int command; void *from; } cmd_list[8];
 366 static int cmd_ptr;
 367
 368 static void fas216_cmd(FAS216_Info *info, unsigned int command)
 369 {
 370         cmd_list[cmd_ptr].command = command;
 371         cmd_list[cmd_ptr].from = __builtin_return_address(0);
 372
 373         cmd_ptr = (cmd_ptr + 1) & 7;
 374
 375         fas216_writeb(info, REG_CMD, command);
 376 }
 377
 378 static void print_debug_list(void)
 379 {
 380         int i;
 381
 382         i = ph_ptr;
 383
 384         printk(KERN_ERR "SCSI IRQ trail\n");
 385         do {
 386                 printk(" %02x:%02x:%02x:%1x",
 387                         ph_list[i].stat, ph_list[i].ssr,
 388                         ph_list[i].isr, ph_list[i].ph);
 389                 i = (i + 1) & (PH_SIZE - 1);
 390                 if (((i ^ ph_ptr) & 7) == 0)
 391                         printk("\n");
 392         } while (i != ph_ptr);
 393         if ((i ^ ph_ptr) & 7)
 394                 printk("\n");
 395
 396         i = cmd_ptr;
 397         printk(KERN_ERR "FAS216 commands: ");
 398         do {
 399                 printk("%02x:%p ", cmd_list[i].command, cmd_list[i].from);
 400                 i = (i + 1) & 7;
 401         } while (i != cmd_ptr);
 402         printk("\n");
 403 }
 404
 405 static void fas216_done(FAS216_Info *info, unsigned int result);
 406
 407 /**
 408  * fas216_get_last_msg - retrive last message from the list
 409  * @info: interface to search
 410  * @pos: current fifo position
 411  *
 412  * Retrieve a last message from the list, using position in fifo.
 413  */
 414 static inline unsigned short
 415 fas216_get_last_msg(FAS216_Info *info, int pos)
 416 {
 417         unsigned short packed_msg = NOP;
 418         struct message *msg;
 419         int msgnr = 0;
 420
 421         while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
 422                 if (pos >= msg->fifo)
 423                         break;
 424         }
 425
 426         if (msg) {
 427                 if (msg->msg[0] == EXTENDED_MESSAGE)
 428                         packed_msg = EXTENDED_MESSAGE | msg->msg[2] << 8;
 429                 else
 430                         packed_msg = msg->msg[0];
 431         }
 432
 433         fas216_log(info, LOG_MESSAGES,
 434                 "Message: %04x found at position %02x\n", packed_msg, pos);
 435
 436         return packed_msg;
 437 }
 438
 439 /**
 440  * fas216_syncperiod - calculate STP register value
 441  * @info: state structure for interface connected to device
 442  * @ns: period in ns (between subsequent bytes)
 443  *
 444  * Calculate value to be loaded into the STP register for a given period
 445  * in ns. Returns a value suitable for REG_STP.
 446  */
 447 static int fas216_syncperiod(FAS216_Info *info, int ns)
 448 {
 449         int value = (info->ifcfg.clockrate * ns) / 1000;
 450
 451         fas216_checkmagic(info);
 452
 453         if (value < 4)
 454                 value = 4;
 455         else if (value > 35)
 456                 value = 35;
 457
 458         return value & 31;
 459 }
 460
 461 /**
 462  * fas216_set_sync - setup FAS216 chip for specified transfer period.
 463  * @info: state structure for interface connected to device
 464  * @target: target
 465  *
 466  * Correctly setup FAS216 chip for specified transfer period.
 467  * Notes   : we need to switch the chip out of FASTSCSI mode if we have
 468  *           a transfer period >= 200ns - otherwise the chip will violate
 469  *           the SCSI timings.
 470  */
 471 static void fas216_set_sync(FAS216_Info *info, int target)
 472 {
 473         unsigned int cntl3;
 474
 475         fas216_writeb(info, REG_SOF, info->device[target].sof);
 476         fas216_writeb(info, REG_STP, info->device[target].stp);
 477
 478         cntl3 = info->scsi.cfg[2];
 479         if (info->device[target].period >= (200 / 4))
 480                 cntl3 = cntl3 & ~CNTL3_FASTSCSI;
 481
 482         fas216_writeb(info, REG_CNTL3, cntl3);
 483 }
 484
 485 /* Synchronous transfer support
 486  *
 487  * Note: The SCSI II r10 spec says (5.6.12):
 488  *
 489  *  (2)  Due to historical problems with early host adapters that could
 490  *  not accept an SDTR message, some targets may not initiate synchronous
 491  *  negotiation after a power cycle as required by this standard.  Host
 492  *  adapters that support synchronous mode may avoid the ensuing failure
 493  *  modes when the target is independently power cycled by initiating a
 494  *  synchronous negotiation on each REQUEST SENSE and INQUIRY command.
 495  *  This approach increases the SCSI bus overhead and is not recommended
 496  *  for new implementations.  The correct method is to respond to an
 497  *  SDTR message with a MESSAGE REJECT message if the either the
 498  *  initiator or target devices does not support synchronous transfers
 499  *  or does not want to negotiate for synchronous transfers at the time.
 500  *  Using the correct method assures compatibility with wide data
 501  *  transfers and future enhancements.
 502  *
 503  * We will always initiate a synchronous transfer negotiation request on
 504  * every INQUIRY or REQUEST SENSE message, unless the target itself has
 505  * at some point performed a synchronous transfer negotiation request, or
 506  * we have synchronous transfers disabled for this device.
 507  */
 508
 509 /**
 510  * fas216_handlesync - Handle a synchronous transfer message
 511  * @info: state structure for interface
 512  * @msg: message from target
 513  *
 514  * Handle a synchronous transfer message from the target
 515  */
 516 static void fas216_handlesync(FAS216_Info *info, char *msg)
 517 {
 518         struct fas216_device *dev = &info->device[info->SCpnt->device->id];
 519         enum { sync, async, none, reject } res = none;
 520
 521 #ifdef SCSI2_SYNC
 522         switch (msg[0]) {
 523         case MESSAGE_REJECT:
 524                 /* Synchronous transfer request failed.
 525                  * Note: SCSI II r10:
 526                  *
 527                  *  SCSI devices that are capable of synchronous
 528                  *  data transfers shall not respond to an SDTR
 529                  *  message with a MESSAGE REJECT message.
 530                  *
 531                  * Hence, if we get this condition, we disable
 532                  * negotiation for this device.
 533                  */
 534                 if (dev->sync_state == neg_inprogress) {
 535                         dev->sync_state = neg_invalid;
 536                         res = async;
 537                 }
 538                 break;
 539
 540         case EXTENDED_MESSAGE:
 541                 switch (dev->sync_state) {
 542                 /* We don't accept synchronous transfer requests.
 543                  * Respond with a MESSAGE_REJECT to prevent a
 544                  * synchronous transfer agreement from being reached.
 545                  */
 546                 case neg_invalid:
 547                         res = reject;
 548                         break;
 549
 550                 /* We were not negotiating a synchronous transfer,
 551                  * but the device sent us a negotiation request.
 552                  * Honour the request by sending back a SDTR
 553                  * message containing our capability, limited by
 554                  * the targets capability.
 555                  */
 556                 default:
 557                         fas216_cmd(info, CMD_SETATN);
 558                         if (msg[4] > info->ifcfg.sync_max_depth)
 559                                 msg[4] = info->ifcfg.sync_max_depth;
 560                         if (msg[3] < 1000 / info->ifcfg.clockrate)
 561                                 msg[3] = 1000 / info->ifcfg.clockrate;
 562
 563                         msgqueue_flush(&info->scsi.msgs);
 564                         msgqueue_addmsg(&info->scsi.msgs, 5,
 565                                         EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
 566                                         msg[3], msg[4]);
 567                         info->scsi.phase = PHASE_MSGOUT_EXPECT;
 568
 569                         /* This is wrong.  The agreement is not in effect
 570                          * until this message is accepted by the device
 571                          */
 572                         dev->sync_state = neg_targcomplete;
 573                         res = sync;
 574                         break;
 575
 576                 /* We initiated the synchronous transfer negotiation,
 577                  * and have successfully received a response from the
 578                  * target.  The synchronous transfer agreement has been
 579                  * reached.  Note: if the values returned are out of our
 580                  * bounds, we must reject the message.
 581                  */
 582                 case neg_inprogress:
 583                         res = reject;
 584                         if (msg[4] <= info->ifcfg.sync_max_depth &&
 585                             msg[3] >= 1000 / info->ifcfg.clockrate) {
 586                                 dev->sync_state = neg_complete;
 587                                 res = sync;
 588                         }
 589                         break;
 590                 }
 591         }
 592 #else
 593         res = reject;
 594 #endif
 595
 596         switch (res) {
 597         case sync:
 598                 dev->period = msg[3];
 599                 dev->sof    = msg[4];
 600                 dev->stp    = fas216_syncperiod(info, msg[3] * 4);
 601                 fas216_set_sync(info, info->SCpnt->device->id);
 602                 break;
 603
 604         case reject:
 605                 fas216_cmd(info, CMD_SETATN);
 606                 msgqueue_flush(&info->scsi.msgs);
 607                 msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
 608                 info->scsi.phase = PHASE_MSGOUT_EXPECT;
 609
 610         case async:
 611                 dev->period = info->ifcfg.asyncperiod / 4;
 612                 dev->sof    = 0;
 613                 dev->stp    = info->scsi.async_stp;
 614                 fas216_set_sync(info, info->SCpnt->device->id);
 615                 break;
 616
 617         case none:
 618                 break;
 619         }
 620 }
 621
 622 /**
 623  * fas216_updateptrs - update data pointers after transfer suspended/paused
 624  * @info: interface's local pointer to update
 625  * @bytes_transferred: number of bytes transferred
 626  *
 627  * Update data pointers after transfer suspended/paused
 628  */
 629 static void fas216_updateptrs(FAS216_Info *info, int bytes_transferred)
 630 {
 631         struct scsi_pointer *SCp = &info->scsi.SCp;
 632
 633         fas216_checkmagic(info);
 634
 635         BUG_ON(bytes_transferred < 0);
 636
 637         info->SCpnt->request_bufflen -= bytes_transferred;
 638
 639         while (bytes_transferred != 0) {
 640                 if (SCp->this_residual > bytes_transferred)
 641                         break;
 642                 /*
 643                  * We have used up this buffer.  Move on to the
 644                  * next buffer.
 645                  */
 646                 bytes_transferred -= SCp->this_residual;
 647                 if (!next_SCp(SCp) && bytes_transferred) {
 648                         printk(KERN_WARNING "scsi%d.%c: out of buffers\n",
 649                                 info->host->host_no, '0' + info->SCpnt->device->id);
 650                         return;
 651                 }
 652         }
 653
 654         SCp->this_residual -= bytes_transferred;
 655         if (SCp->this_residual)
 656                 SCp->ptr += bytes_transferred;
 657         else
 658                 SCp->ptr = NULL;
 659 }
 660
 661 /**
 662  * fas216_pio - transfer data off of/on to card using programmed IO
 663  * @info: interface to transfer data to/from
 664  * @direction: direction to transfer data (DMA_OUT/DMA_IN)
 665  *
 666  * Transfer data off of/on to card using programmed IO.
 667  * Notes: this is incredibly slow.
 668  */
 669 static void fas216_pio(FAS216_Info *info, fasdmadir_t direction)
 670 {
 671         struct scsi_pointer *SCp = &info->scsi.SCp;
 672
 673         fas216_checkmagic(info);
 674
 675         if (direction == DMA_OUT)
 676                 fas216_writeb(info, REG_FF, get_next_SCp_byte(SCp));
 677         else
 678                 put_next_SCp_byte(SCp, fas216_readb(info, REG_FF));
 679
 680         if (SCp->this_residual == 0)
 681                 next_SCp(SCp);
 682 }
 683
 684 static void fas216_set_stc(FAS216_Info *info, unsigned int length)
 685 {
 686         fas216_writeb(info, REG_STCL, length);
 687         fas216_writeb(info, REG_STCM, length >> 8);
 688         fas216_writeb(info, REG_STCH, length >> 16);
 689 }
 690
 691 static unsigned int fas216_get_ctc(FAS216_Info *info)
 692 {
 693         return fas216_readb(info, REG_CTCL) +
 694                (fas216_readb(info, REG_CTCM) << 8) +
 695                (fas216_readb(info, REG_CTCH) << 16);
 696 }
 697
 698 /**
 699  * fas216_cleanuptransfer - clean up after a transfer has completed.
 700  * @info: interface to clean up
 701  *
 702  * Update the data pointers according to the number of bytes transferred
 703  * on the SCSI bus.
 704  */
 705 static void fas216_cleanuptransfer(FAS216_Info *info)
 706 {
 707         unsigned long total, residual, fifo;
 708         fasdmatype_t dmatype = info->dma.transfer_type;
 709
 710         info->dma.transfer_type = fasdma_none;
 711
 712         /*
 713          * PIO transfers do not need to be cleaned up.
 714          */
 715         if (dmatype == fasdma_pio || dmatype == fasdma_none)
 716                 return;
 717
 718         if (dmatype == fasdma_real_all)
 719                 total = info->SCpnt->request_bufflen;
 720         else
 721                 total = info->scsi.SCp.this_residual;
 722
 723         residual = fas216_get_ctc(info);
 724
 725         fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
 726
 727         fas216_log(info, LOG_BUFFER, "cleaning up from previous "
 728                    "transfer: length 0x%06x, residual 0x%x, fifo %d",
 729                    total, residual, fifo);
 730
 731         /*
 732          * If we were performing Data-Out, the transfer counter
 733          * counts down each time a byte is transferred by the
 734          * host to the FIFO.  This means we must include the
 735          * bytes left in the FIFO from the transfer counter.
 736          */
 737         if (info->scsi.phase == PHASE_DATAOUT)
 738                 residual += fifo;
 739
 740         fas216_updateptrs(info, total - residual);
 741 }
 742
 743 /**
 744  * fas216_transfer - Perform a DMA/PIO transfer off of/on to card
 745  * @info: interface from which device disconnected from
 746  *
 747  * Start a DMA/PIO transfer off of/on to card
 748  */
 749 static void fas216_transfer(FAS216_Info *info)
 750 {
 751         fasdmadir_t direction;
 752         fasdmatype_t dmatype;
 753
 754         fas216_log(info, LOG_BUFFER,
 755                    "starttransfer: buffer %p length 0x%06x reqlen 0x%06x",
 756                    info->scsi.SCp.ptr, info->scsi.SCp.this_residual,
 757                    info->SCpnt->request_bufflen);
 758
 759         if (!info->scsi.SCp.ptr) {
 760                 fas216_log(info, LOG_ERROR, "null buffer passed to "
 761                            "fas216_starttransfer");
 762                 print_SCp(&info->scsi.SCp, "SCp: ", "\n");
 763                 print_SCp(&info->SCpnt->SCp, "Cmnd SCp: ", "\n");
 764                 return;
 765         }
 766
 767         /*
 768          * If we have a synchronous transfer agreement in effect, we must
 769          * use DMA mode.  If we are using asynchronous transfers, we may
 770          * use DMA mode or PIO mode.
 771          */
 772         if (info->device[info->SCpnt->device->id].sof)
 773                 dmatype = fasdma_real_all;
 774         else
 775                 dmatype = fasdma_pio;
 776
 777         if (info->scsi.phase == PHASE_DATAOUT)
 778                 direction = DMA_OUT;
 779         else
 780                 direction = DMA_IN;
 781
 782         if (info->dma.setup)
 783                 dmatype = info->dma.setup(info->host, &info->scsi.SCp,
 784                                           direction, dmatype);
 785         info->dma.transfer_type = dmatype;
 786
 787         if (dmatype == fasdma_real_all)
 788                 fas216_set_stc(info, info->SCpnt->request_bufflen);
 789         else
 790                 fas216_set_stc(info, info->scsi.SCp.this_residual);
 791
 792         switch (dmatype) {
 793         case fasdma_pio:
 794                 fas216_log(info, LOG_BUFFER, "PIO transfer");
 795                 fas216_writeb(info, REG_SOF, 0);
 796                 fas216_writeb(info, REG_STP, info->scsi.async_stp);
 797                 fas216_cmd(info, CMD_TRANSFERINFO);
 798                 fas216_pio(info, direction);
 799                 break;
 800
 801         case fasdma_pseudo:
 802                 fas216_log(info, LOG_BUFFER, "pseudo transfer");
 803                 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
 804                 info->dma.pseudo(info->host, &info->scsi.SCp,
 805                                  direction, info->SCpnt->transfersize);
 806                 break;
 807
 808         case fasdma_real_block:
 809                 fas216_log(info, LOG_BUFFER, "block dma transfer");
 810                 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
 811                 break;
 812
 813         case fasdma_real_all:
 814                 fas216_log(info, LOG_BUFFER, "total dma transfer");
 815                 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
 816                 break;
 817
 818         default:
 819                 fas216_log(info, LOG_BUFFER | LOG_ERROR,
 820                            "invalid FAS216 DMA type");
 821                 break;
 822         }
 823 }
 824
 825 /**
 826  * fas216_stoptransfer - Stop a DMA transfer onto / off of the card
 827  * @info: interface from which device disconnected from
 828  *
 829  * Called when we switch away from DATA IN or DATA OUT phases.
 830  */
 831 static void fas216_stoptransfer(FAS216_Info *info)
 832 {
 833         fas216_checkmagic(info);
 834
 835         if (info->dma.transfer_type == fasdma_real_all ||
 836             info->dma.transfer_type == fasdma_real_block)
 837                 info->dma.stop(info->host, &info->scsi.SCp);
 838
 839         fas216_cleanuptransfer(info);
 840
 841         if (info->scsi.phase == PHASE_DATAIN) {
 842                 unsigned int fifo;
 843
 844                 /*
 845                  * If we were performing Data-In, then the FIFO counter
 846                  * contains the number of bytes not transferred via DMA
 847                  * from the on-board FIFO.  Read them manually.
 848                  */
 849                 fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
 850                 while (fifo && info->scsi.SCp.ptr) {
 851                         *info->scsi.SCp.ptr = fas216_readb(info, REG_FF);
 852                         fas216_updateptrs(info, 1);
 853                         fifo--;
 854                 }
 855         } else {
 856                 /*
 857                  * After a Data-Out phase, there may be unsent
 858                  * bytes left in the FIFO.  Flush them out.
 859                  */
 860                 fas216_cmd(info, CMD_FLUSHFIFO);
 861         }
 862 }
 863
 864 static void fas216_aborttransfer(FAS216_Info *info)
 865 {
 866         fas216_checkmagic(info);
 867
 868         if (info->dma.transfer_type == fasdma_real_all ||
 869             info->dma.transfer_type == fasdma_real_block)
 870                 info->dma.stop(info->host, &info->scsi.SCp);
 871
 872         info->dma.transfer_type = fasdma_none;
 873         fas216_cmd(info, CMD_FLUSHFIFO);
 874 }
 875
 876 static void fas216_kick(FAS216_Info *info);
 877
 878 /**
 879  * fas216_disconnected_intr - handle device disconnection
 880  * @info: interface from which device disconnected from
 881  *
 882  * Handle device disconnection
 883  */
 884 static void fas216_disconnect_intr(FAS216_Info *info)
 885 {
 886         unsigned long flags;
 887
 888         fas216_checkmagic(info);
 889
 890         fas216_log(info, LOG_CONNECT, "disconnect phase=%02x",
 891                    info->scsi.phase);
 892
 893         msgqueue_flush(&info->scsi.msgs);
 894
 895         switch (info->scsi.phase) {
 896         case PHASE_SELECTION:                   /* while selecting - no target          */
 897         case PHASE_SELSTEPS:
 898                 fas216_done(info, DID_NO_CONNECT);
 899                 break;
 900
 901         case PHASE_MSGIN_DISCONNECT:            /* message in - disconnecting           */
 902                 info->scsi.disconnectable = 1;
 903                 info->scsi.phase = PHASE_IDLE;
 904                 info->stats.disconnects += 1;
 905                 spin_lock_irqsave(&info->host_lock, flags);
 906                 if (info->scsi.phase == PHASE_IDLE)
 907                         fas216_kick(info);
 908                 spin_unlock_irqrestore(&info->host_lock, flags);
 909                 break;
 910
 911         case PHASE_DONE:                        /* at end of command - complete         */
 912                 fas216_done(info, DID_OK);
 913                 break;
 914
 915         case PHASE_MSGOUT:                      /* message out - possible ABORT message */
 916                 if (fas216_get_last_msg(info, info->scsi.msgin_fifo) == ABORT) {
 917                         info->scsi.aborting = 0;
 918                         fas216_done(info, DID_ABORT);
 919                         break;
 920                 }
 921
 922         default:                                /* huh?                                 */
 923                 printk(KERN_ERR "scsi%d.%c: unexpected disconnect in phase %s\n",
 924                         info->host->host_no, fas216_target(info), fas216_drv_phase(info));
 925                 print_debug_list();
 926                 fas216_stoptransfer(info);
 927                 fas216_done(info, DID_ERROR);
 928                 break;
 929         }
 930 }
 931
 932 /**
 933  * fas216_reselected_intr - start reconnection of a device
 934  * @info: interface which was reselected
 935  *
 936  * Start reconnection of a device
 937  */
 938 static void
 939 fas216_reselected_intr(FAS216_Info *info)
 940 {
 941         unsigned int cfis, i;
 942         unsigned char msg[4];
 943         unsigned char target, lun, tag;
 944
 945         fas216_checkmagic(info);
 946
 947         WARN_ON(info->scsi.phase == PHASE_SELECTION ||
 948                 info->scsi.phase == PHASE_SELSTEPS);
 949
 950         cfis = fas216_readb(info, REG_CFIS);
 951
 952         fas216_log(info, LOG_CONNECT, "reconnect phase=%02x cfis=%02x",
 953                    info->scsi.phase, cfis);
 954
 955         cfis &= CFIS_CF;
 956
 957         if (cfis < 2 || cfis > 4) {
 958                 printk(KERN_ERR "scsi%d.H: incorrect number of bytes after reselect\n",
 959                         info->host->host_no);
 960                 goto bad_message;
 961         }
 962
 963         for (i = 0; i < cfis; i++)
 964                 msg[i] = fas216_readb(info, REG_FF);
 965
 966         if (!(msg[0] & (1 << info->host->this_id)) ||
 967             !(msg[1] & 0x80))
 968                 goto initiator_error;
 969
 970         target = msg[0] & ~(1 << info->host->this_id);
 971         target = ffs(target) - 1;
 972         lun = msg[1] & 7;
 973         tag = 0;
 974
 975         if (cfis >= 3) {
 976                 if (msg[2] != SIMPLE_QUEUE_TAG)
 977                         goto initiator_error;
 978
 979                 tag = msg[3];
 980         }
 981
 982         /* set up for synchronous transfers */
 983         fas216_writeb(info, REG_SDID, target);
 984         fas216_set_sync(info, target);
 985         msgqueue_flush(&info->scsi.msgs);
 986
 987         fas216_log(info, LOG_CONNECT, "Reconnected: target %1x lun %1x tag %02x",
 988                    target, lun, tag);
 989
 990         if (info->scsi.disconnectable && info->SCpnt) {
 991                 info->scsi.disconnectable = 0;
 992                 if (info->SCpnt->device->id  == target &&
 993                     info->SCpnt->device->lun == lun &&
 994                     info->SCpnt->tag         == tag) {
 995                         fas216_log(info, LOG_CONNECT, "reconnected previously executing command");
 996                 } else {
 997                         queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
 998                         fas216_log(info, LOG_CONNECT, "had to move command to disconnected queue");
 999                         info->SCpnt = NULL;
1000                 }
1001         }
1002         if (!info->SCpnt) {
1003                 info->SCpnt = queue_remove_tgtluntag(&info->queues.disconnected,
1004                                         target, lun, tag);
1005                 fas216_log(info, LOG_CONNECT, "had to get command");
1006         }
1007
1008         if (info->SCpnt) {
1009                 /*
1010                  * Restore data pointer from SAVED data pointer
1011                  */
1012                 info->scsi.SCp = info->SCpnt->SCp;
1013
1014                 fas216_log(info, LOG_CONNECT, "data pointers: [%p, %X]",
1015                         info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1016                 info->scsi.phase = PHASE_MSGIN;
1017         } else {
1018                 /*
1019                  * Our command structure not found - abort the
1020                  * command on the target.  Since we have no
1021                  * record of this command, we can't send
1022                  * an INITIATOR DETECTED ERROR message.
1023                  */
1024                 fas216_cmd(info, CMD_SETATN);
1025
1026 #if 0
1027                 if (tag)
1028                         msgqueue_addmsg(&info->scsi.msgs, 2, ABORT_TAG, tag);
1029                 else
1030 #endif
1031                         msgqueue_addmsg(&info->scsi.msgs, 1, ABORT);
1032                 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1033                 info->scsi.aborting = 1;
1034         }
1035
1036         fas216_cmd(info, CMD_MSGACCEPTED);
1037         return;
1038
1039  initiator_error:
1040         printk(KERN_ERR "scsi%d.H: error during reselection: bytes",
1041                 info->host->host_no);
1042         for (i = 0; i < cfis; i++)
1043                 printk(" %02x", msg[i]);
1044         printk("\n");
1045  bad_message:
1046         fas216_cmd(info, CMD_SETATN);
1047         msgqueue_flush(&info->scsi.msgs);
1048         msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1049         info->scsi.phase = PHASE_MSGOUT_EXPECT;
1050         fas216_cmd(info, CMD_MSGACCEPTED);
1051 }
1052
1053 static void fas216_parse_message(FAS216_Info *info, unsigned char *message, int msglen)
1054 {
1055         int i;
1056
1057         switch (message[0]) {
1058         case COMMAND_COMPLETE:
1059                 if (msglen != 1)
1060                         goto unrecognised;
1061
1062                 printk(KERN_ERR "scsi%d.%c: command complete with no "
1063                         "status in MESSAGE_IN?\n",
1064                         info->host->host_no, fas216_target(info));
1065                 break;
1066
1067         case SAVE_POINTERS:
1068                 if (msglen != 1)
1069                         goto unrecognised;
1070
1071                 /*
1072                  * Save current data pointer to SAVED data pointer
1073                  * SCSI II standard says that we must not acknowledge
1074                  * this until we have really saved pointers.
1075                  * NOTE: we DO NOT save the command nor status pointers
1076                  * as required by the SCSI II standard.  These always
1077                  * point to the start of their respective areas.
1078                  */
1079                 info->SCpnt->SCp = info->scsi.SCp;
1080                 info->SCpnt->SCp.sent_command = 0;
1081                 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
1082                         "save data pointers: [%p, %X]",
1083                         info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1084                 break;
1085
1086         case RESTORE_POINTERS:
1087                 if (msglen != 1)
1088                         goto unrecognised;
1089
1090                 /*
1091                  * Restore current data pointer from SAVED data pointer
1092                  */
1093                 info->scsi.SCp = info->SCpnt->SCp;
1094                 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
1095                         "restore data pointers: [%p, 0x%x]",
1096                         info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1097                 break;
1098
1099         case DISCONNECT:
1100                 if (msglen != 1)
1101                         goto unrecognised;
1102
1103                 info->scsi.phase = PHASE_MSGIN_DISCONNECT;
1104                 break;
1105
1106         case MESSAGE_REJECT:
1107                 if (msglen != 1)
1108                         goto unrecognised;
1109
1110                 switch (fas216_get_last_msg(info, info->scsi.msgin_fifo)) {
1111                 case EXTENDED_MESSAGE | EXTENDED_SDTR << 8:
1112                         fas216_handlesync(info, message);
1113                         break;
1114
1115                 default:
1116                         fas216_log(info, 0, "reject, last message 0x%04x",
1117                                 fas216_get_last_msg(info, info->scsi.msgin_fifo));
1118                 }
1119                 break;
1120
1121         case NOP:
1122                 break;
1123
1124         case EXTENDED_MESSAGE:
1125                 if (msglen < 3)
1126                         goto unrecognised;
1127
1128                 switch (message[2]) {
1129                 case EXTENDED_SDTR:     /* Sync transfer negotiation request/reply */
1130                         fas216_handlesync(info, message);
1131                         break;
1132
1133                 default:
1134                         goto unrecognised;
1135                 }
1136                 break;
1137
1138         default:
1139                 goto unrecognised;
1140         }
1141         return;
1142
1143 unrecognised:
1144         fas216_log(info, 0, "unrecognised message, rejecting");
1145         printk("scsi%d.%c: message was", info->host->host_no, fas216_target(info));
1146         for (i = 0; i < msglen; i++)
1147                 printk("%s%02X", i & 31 ? " " : "\n  ", message[i]);
1148         printk("\n");
1149
1150         /*
1151          * Something strange seems to be happening here -
1152          * I can't use SETATN since the chip gives me an
1153          * invalid command interrupt when I do.  Weird.
1154          */
1155 fas216_cmd(info, CMD_NOP);
1156 fas216_dumpstate(info);
1157         fas216_cmd(info, CMD_SETATN);
1158         msgqueue_flush(&info->scsi.msgs);
1159         msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
1160         info->scsi.phase = PHASE_MSGOUT_EXPECT;
1161 fas216_dumpstate(info);
1162 }
1163
1164 static int fas216_wait_cmd(FAS216_Info *info, int cmd)
1165 {
1166         int tout;
1167         int stat;
1168
1169         fas216_cmd(info, cmd);
1170
1171         for (tout = 1000; tout; tout -= 1) {
1172                 stat = fas216_readb(info, REG_STAT);
1173                 if (stat & (STAT_INT|STAT_PARITYERROR))
1174                         break;
1175                 udelay(1);
1176         }
1177
1178         return stat;
1179 }
1180
1181 static int fas216_get_msg_byte(FAS216_Info *info)
1182 {
1183         unsigned int stat = fas216_wait_cmd(info, CMD_MSGACCEPTED);
1184
1185         if ((stat & STAT_INT) == 0)
1186                 goto timedout;
1187
1188         if ((stat & STAT_BUSMASK) != STAT_MESGIN)
1189                 goto unexpected_phase_change;
1190
1191         fas216_readb(info, REG_INST);
1192
1193         stat = fas216_wait_cmd(info, CMD_TRANSFERINFO);
1194
1195         if ((stat & STAT_INT) == 0)
1196                 goto timedout;
1197
1198         if (stat & STAT_PARITYERROR)
1199                 goto parity_error;
1200
1201         if ((stat & STAT_BUSMASK) != STAT_MESGIN)
1202                 goto unexpected_phase_change;
1203
1204         fas216_readb(info, REG_INST);
1205
1206         return fas216_readb(info, REG_FF);
1207
1208 timedout:
1209         fas216_log(info, LOG_ERROR, "timed out waiting for message byte");
1210         return -1;
1211
1212 unexpected_phase_change:
1213         fas216_log(info, LOG_ERROR, "unexpected phase change: status = %02x", stat);
1214         return -2;
1215
1216 parity_error:
1217         fas216_log(info, LOG_ERROR, "parity error during message in phase");
1218         return -3;
1219 }
1220
1221 /**
1222  * fas216_message - handle a function done interrupt from FAS216 chip
1223  * @info: interface which caused function done interrupt
1224  *
1225  * Handle a function done interrupt from FAS216 chip
1226  */
1227 static void fas216_message(FAS216_Info *info)
1228 {
1229         unsigned char *message = info->scsi.message;
1230         unsigned int msglen = 1;
1231         int msgbyte = 0;
1232
1233         fas216_checkmagic(info);
1234
1235         message[0] = fas216_readb(info, REG_FF);
1236
1237         if (message[0] == EXTENDED_MESSAGE) {
1238                 msgbyte = fas216_get_msg_byte(info);
1239
1240                 if (msgbyte >= 0) {
1241                         message[1] = msgbyte;
1242
1243                         for (msglen = 2; msglen < message[1] + 2; msglen++) {
1244                                 msgbyte = fas216_get_msg_byte(info);
1245
1246                                 if (msgbyte >= 0)
1247                                         message[msglen] = msgbyte;
1248                                 else
1249                                         break;
1250                         }
1251                 }
1252         }
1253
1254         if (msgbyte == -3)
1255                 goto parity_error;
1256
1257 #ifdef DEBUG_MESSAGES
1258         {
1259                 int i;
1260
1261                 printk("scsi%d.%c: message in: ",
1262                         info->host->host_no, fas216_target(info));
1263                 for (i = 0; i < msglen; i++)
1264                         printk("%02X ", message[i]);
1265                 printk("\n");
1266         }
1267 #endif
1268
1269         fas216_parse_message(info, message, msglen);
1270         fas216_cmd(info, CMD_MSGACCEPTED);
1271         return;
1272
1273 parity_error:
1274         fas216_cmd(info, CMD_SETATN);
1275         msgqueue_flush(&info->scsi.msgs);
1276         msgqueue_addmsg(&info->scsi.msgs, 1, MSG_PARITY_ERROR);
1277         info->scsi.phase = PHASE_MSGOUT_EXPECT;
1278         fas216_cmd(info, CMD_MSGACCEPTED);
1279         return;
1280 }
1281
1282 /**
1283  * fas216_send_command - send command after all message bytes have been sent
1284  * @info: interface which caused bus service
1285  *
1286  * Send a command to a target after all message bytes have been sent
1287  */
1288 static void fas216_send_command(FAS216_Info *info)
1289 {
1290         int i;
1291
1292         fas216_checkmagic(info);
1293
1294         fas216_cmd(info, CMD_NOP|CMD_WITHDMA);
1295         fas216_cmd(info, CMD_FLUSHFIFO);
1296
1297         /* load command */
1298         for (i = info->scsi.SCp.sent_command; i < info->SCpnt->cmd_len; i++)
1299                 fas216_writeb(info, REG_FF, info->SCpnt->cmnd[i]);
1300
1301         fas216_cmd(info, CMD_TRANSFERINFO);
1302
1303         info->scsi.phase = PHASE_COMMAND;
1304 }
1305
1306 /**
1307  * fas216_send_messageout - handle bus service to send a message
1308  * @info: interface which caused bus service
1309  *
1310  * Handle bus service to send a message.
1311  * Note: We do not allow the device to change the data direction!
1312  */
1313 static void fas216_send_messageout(FAS216_Info *info, int start)
1314 {
1315         unsigned int tot_msglen = msgqueue_msglength(&info->scsi.msgs);
1316
1317         fas216_checkmagic(info);
1318
1319         fas216_cmd(info, CMD_FLUSHFIFO);
1320
1321         if (tot_msglen) {
1322                 struct message *msg;
1323                 int msgnr = 0;
1324
1325                 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1326                         int i;
1327
1328                         for (i = start; i < msg->length; i++)
1329                                 fas216_writeb(info, REG_FF, msg->msg[i]);
1330
1331                         msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
1332                         start = 0;
1333                 }
1334         } else
1335                 fas216_writeb(info, REG_FF, NOP);
1336
1337         fas216_cmd(info, CMD_TRANSFERINFO);
1338
1339         info->scsi.phase = PHASE_MSGOUT;
1340 }
1341
1342 /**
1343  * fas216_busservice_intr - handle bus service interrupt from FAS216 chip
1344  * @info: interface which caused bus service interrupt
1345  * @stat: Status register contents
1346  * @is: SCSI Status register contents
1347  *
1348  * Handle a bus service interrupt from FAS216 chip
1349  */
1350 static void fas216_busservice_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
1351 {
1352         fas216_checkmagic(info);
1353
1354         fas216_log(info, LOG_BUSSERVICE,
1355                    "bus service: stat=%02x is=%02x phase=%02x",
1356                    stat, is, info->scsi.phase);
1357
1358         switch (info->scsi.phase) {
1359         case PHASE_SELECTION:
1360                 if ((is & IS_BITS) != IS_MSGBYTESENT)
1361                         goto bad_is;
1362                 break;
1363
1364         case PHASE_SELSTEPS:
1365                 switch (is & IS_BITS) {
1366                 case IS_SELARB:
1367                 case IS_MSGBYTESENT:
1368                         goto bad_is;
1369
1370                 case IS_NOTCOMMAND:
1371                 case IS_EARLYPHASE:
1372                         if ((stat & STAT_BUSMASK) == STAT_MESGIN)
1373                                 break;
1374                         goto bad_is;
1375
1376                 case IS_COMPLETE:
1377                         break;
1378                 }
1379
1380         default:
1381                 break;
1382         }
1383
1384         fas216_cmd(info, CMD_NOP);
1385
1386 #define STATE(st,ph) ((ph) << 3 | (st))
1387         /* This table describes the legal SCSI state transitions,
1388          * as described by the SCSI II spec.
1389          */
1390         switch (STATE(stat & STAT_BUSMASK, info->scsi.phase)) {
1391         case STATE(STAT_DATAIN, PHASE_SELSTEPS):/* Sel w/ steps -> Data In      */
1392         case STATE(STAT_DATAIN, PHASE_MSGOUT):  /* Message Out  -> Data In      */
1393         case STATE(STAT_DATAIN, PHASE_COMMAND): /* Command      -> Data In      */
1394         case STATE(STAT_DATAIN, PHASE_MSGIN):   /* Message In   -> Data In      */
1395                 info->scsi.phase = PHASE_DATAIN;
1396                 fas216_transfer(info);
1397                 return;
1398
1399         case STATE(STAT_DATAIN, PHASE_DATAIN):  /* Data In      -> Data In      */
1400         case STATE(STAT_DATAOUT, PHASE_DATAOUT):/* Data Out     -> Data Out     */
1401                 fas216_cleanuptransfer(info);
1402                 fas216_transfer(info);
1403                 return;
1404
1405         case STATE(STAT_DATAOUT, PHASE_SELSTEPS):/* Sel w/ steps-> Data Out     */
1406         case STATE(STAT_DATAOUT, PHASE_MSGOUT): /* Message Out  -> Data Out     */
1407         case STATE(STAT_DATAOUT, PHASE_COMMAND):/* Command      -> Data Out     */
1408         case STATE(STAT_DATAOUT, PHASE_MSGIN):  /* Message In   -> Data Out     */
1409                 fas216_cmd(info, CMD_FLUSHFIFO);
1410                 info->scsi.phase = PHASE_DATAOUT;
1411                 fas216_transfer(info);
1412                 return;
1413
1414         case STATE(STAT_STATUS, PHASE_DATAOUT): /* Data Out     -> Status       */
1415         case STATE(STAT_STATUS, PHASE_DATAIN):  /* Data In      -> Status       */
1416                 fas216_stoptransfer(info);
1417         case STATE(STAT_STATUS, PHASE_SELSTEPS):/* Sel w/ steps -> Status       */
1418         case STATE(STAT_STATUS, PHASE_MSGOUT):  /* Message Out  -> Status       */
1419         case STATE(STAT_STATUS, PHASE_COMMAND): /* Command      -> Status       */
1420         case STATE(STAT_STATUS, PHASE_MSGIN):   /* Message In   -> Status       */
1421                 fas216_cmd(info, CMD_INITCMDCOMPLETE);
1422                 info->scsi.phase = PHASE_STATUS;
1423                 return;
1424
1425         case STATE(STAT_MESGIN, PHASE_DATAOUT): /* Data Out     -> Message In   */
1426         case STATE(STAT_MESGIN, PHASE_DATAIN):  /* Data In      -> Message In   */
1427                 fas216_stoptransfer(info);
1428         case STATE(STAT_MESGIN, PHASE_COMMAND): /* Command      -> Message In   */
1429         case STATE(STAT_MESGIN, PHASE_SELSTEPS):/* Sel w/ steps -> Message In   */
1430         case STATE(STAT_MESGIN, PHASE_MSGOUT):  /* Message Out  -> Message In   */
1431                 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
1432                 fas216_cmd(info, CMD_FLUSHFIFO);
1433                 fas216_cmd(info, CMD_TRANSFERINFO);
1434                 info->scsi.phase = PHASE_MSGIN;
1435                 return;
1436
1437         case STATE(STAT_MESGIN, PHASE_MSGIN):
1438                 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
1439                 fas216_cmd(info, CMD_TRANSFERINFO);
1440                 return;
1441
1442         case STATE(STAT_COMMAND, PHASE_MSGOUT): /* Message Out  -> Command      */
1443         case STATE(STAT_COMMAND, PHASE_MSGIN):  /* Message In   -> Command      */
1444                 fas216_send_command(info);
1445                 info->scsi.phase = PHASE_COMMAND;
1446                 return;
1447
1448
1449         /*
1450          * Selection    -> Message Out
1451          */
1452         case STATE(STAT_MESGOUT, PHASE_SELECTION):
1453                 fas216_send_messageout(info, 1);
1454                 return;
1455
1456         /*
1457          * Message Out  -> Message Out
1458          */
1459         case STATE(STAT_MESGOUT, PHASE_SELSTEPS):
1460         case STATE(STAT_MESGOUT, PHASE_MSGOUT):
1461                 /*
1462                  * If we get another message out phase, this usually
1463                  * means some parity error occurred.  Resend complete
1464                  * set of messages.  If we have more than one byte to
1465                  * send, we need to assert ATN again.
1466                  */
1467                 if (info->device[info->SCpnt->device->id].parity_check) {
1468                         /*
1469                          * We were testing... good, the device
1470                          * supports parity checking.
1471                          */
1472                         info->device[info->SCpnt->device->id].parity_check = 0;
1473                         info->device[info->SCpnt->device->id].parity_enabled = 1;
1474                         fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
1475                 }
1476
1477                 if (msgqueue_msglength(&info->scsi.msgs) > 1)
1478                         fas216_cmd(info, CMD_SETATN);
1479                 /*FALLTHROUGH*/
1480
1481         /*
1482          * Any          -> Message Out
1483          */
1484         case STATE(STAT_MESGOUT, PHASE_MSGOUT_EXPECT):
1485                 fas216_send_messageout(info, 0);
1486                 return;
1487
1488         /* Error recovery rules.
1489          *   These either attempt to abort or retry the operation.
1490          * TODO: we need more of these
1491          */
1492         case STATE(STAT_COMMAND, PHASE_COMMAND):/* Command      -> Command      */
1493                 /* error - we've sent out all the command bytes
1494                  * we have.
1495                  * NOTE: we need SAVE DATA POINTERS/RESTORE DATA POINTERS
1496                  * to include the command bytes sent for this to work
1497                  * correctly.
1498                  */
1499                 printk(KERN_ERR "scsi%d.%c: "
1500                         "target trying to receive more command bytes\n",
1501                         info->host->host_no, fas216_target(info));
1502                 fas216_cmd(info, CMD_SETATN);
1503                 fas216_set_stc(info, 15);
1504                 fas216_cmd(info, CMD_PADBYTES | CMD_WITHDMA);
1505                 msgqueue_flush(&info->scsi.msgs);
1506                 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1507                 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1508                 return;
1509         }
1510
1511         if (info->scsi.phase == PHASE_MSGIN_DISCONNECT) {
1512                 printk(KERN_ERR "scsi%d.%c: disconnect message received, but bus service %s?\n",
1513                         info->host->host_no, fas216_target(info),
1514                         fas216_bus_phase(stat));
1515                 msgqueue_flush(&info->scsi.msgs);
1516                 fas216_cmd(info, CMD_SETATN);
1517                 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1518                 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1519                 info->scsi.aborting = 1;
1520                 fas216_cmd(info, CMD_TRANSFERINFO);
1521                 return;
1522         }
1523         printk(KERN_ERR "scsi%d.%c: bus phase %s after %s?\n",
1524                 info->host->host_no, fas216_target(info),
1525                 fas216_bus_phase(stat),
1526                 fas216_drv_phase(info));
1527         print_debug_list();
1528         return;
1529
1530 bad_is:
1531         fas216_log(info, 0, "bus service at step %d?", is & IS_BITS);
1532         fas216_dumpstate(info);
1533         print_debug_list();
1534
1535         fas216_done(info, DID_ERROR);
1536 }
1537
1538 /**
1539  * fas216_funcdone_intr - handle a function done interrupt from FAS216 chip
1540  * @info: interface which caused function done interrupt
1541  * @stat: Status register contents
1542  * @is: SCSI Status register contents
1543  *
1544  * Handle a function done interrupt from FAS216 chip
1545  */
1546 static void fas216_funcdone_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
1547 {
1548         unsigned int fifo_len = fas216_readb(info, REG_CFIS) & CFIS_CF;
1549
1550         fas216_checkmagic(info);
1551
1552         fas216_log(info, LOG_FUNCTIONDONE,
1553                    "function done: stat=%02x is=%02x phase=%02x",
1554                    stat, is, info->scsi.phase);
1555
1556         switch (info->scsi.phase) {
1557         case PHASE_STATUS:                      /* status phase - read status and msg   */
1558                 if (fifo_len != 2) {
1559                         fas216_log(info, 0, "odd number of bytes in FIFO: %d", fifo_len);
1560                 }
1561                 /*
1562                  * Read status then message byte.
1563                  */
1564                 info->scsi.SCp.Status = fas216_readb(info, REG_FF);
1565                 info->scsi.SCp.Message = fas216_readb(info, REG_FF);
1566                 info->scsi.phase = PHASE_DONE;
1567                 fas216_cmd(info, CMD_MSGACCEPTED);
1568                 break;
1569
1570         case PHASE_IDLE:
1571         case PHASE_SELECTION:
1572         case PHASE_SELSTEPS:
1573                 break;
1574
1575         case PHASE_MSGIN:                       /* message in phase                     */
1576                 if ((stat & STAT_BUSMASK) == STAT_MESGIN) {
1577                         info->scsi.msgin_fifo = fifo_len;
1578                         fas216_message(info);
1579                         break;
1580                 }
1581
1582         default:
1583                 fas216_log(info, 0, "internal phase %s for function done?"
1584                         "  What do I do with this?",
1585                         fas216_target(info), fas216_drv_phase(info));
1586         }
1587 }
1588
1589 static void fas216_bus_reset(FAS216_Info *info)
1590 {
1591         neg_t sync_state;
1592         int i;
1593
1594         msgqueue_flush(&info->scsi.msgs);
1595
1596         sync_state = neg_invalid;
1597
1598 #ifdef SCSI2_SYNC
1599         if (info->ifcfg.capabilities & (FASCAP_DMA|FASCAP_PSEUDODMA))
1600                 sync_state = neg_wait;
1601 #endif
1602
1603         info->scsi.phase = PHASE_IDLE;
1604         info->SCpnt = NULL; /* bug! */
1605         memset(&info->scsi.SCp, 0, sizeof(info->scsi.SCp));
1606
1607         for (i = 0; i < 8; i++) {
1608                 info->device[i].disconnect_ok   = info->ifcfg.disconnect_ok;
1609                 info->device[i].sync_state      = sync_state;
1610                 info->device[i].period          = info->ifcfg.asyncperiod / 4;
1611                 info->device[i].stp             = info->scsi.async_stp;
1612                 info->device[i].sof             = 0;
1613                 info->device[i].wide_xfer       = 0;
1614         }
1615
1616         info->rst_bus_status = 1;
1617         wake_up(&info->eh_wait);
1618 }
1619
1620 /**
1621  * fas216_intr - handle interrupts to progress a command
1622  * @info: interface to service
1623  *
1624  * Handle interrupts from the interface to progress a command
1625  */
1626 irqreturn_t fas216_intr(FAS216_Info *info)
1627 {
1628         unsigned char inst, is, stat;
1629         int handled = IRQ_NONE;
1630
1631         fas216_checkmagic(info);
1632
1633         stat = fas216_readb(info, REG_STAT);
1634         is = fas216_readb(info, REG_IS);
1635         inst = fas216_readb(info, REG_INST);
1636
1637         add_debug_list(stat, is, inst, info->scsi.phase);
1638
1639         if (stat & STAT_INT) {
1640                 if (inst & INST_BUSRESET) {
1641                         fas216_log(info, 0, "bus reset detected");
1642                         fas216_bus_reset(info);
1643                         scsi_report_bus_reset(info->host, 0);
1644                 } else if (inst & INST_ILLEGALCMD) {
1645                         fas216_log(info, LOG_ERROR, "illegal command given\n");
1646                         fas216_dumpstate(info);
1647                         print_debug_list();
1648                 } else if (inst & INST_DISCONNECT)
1649                         fas216_disconnect_intr(info);
1650                 else if (inst & INST_RESELECTED)        /* reselected                   */
1651                         fas216_reselected_intr(info);
1652                 else if (inst & INST_BUSSERVICE)        /* bus service request          */
1653                         fas216_busservice_intr(info, stat, is);
1654                 else if (inst & INST_FUNCDONE)          /* function done                */
1655                         fas216_funcdone_intr(info, stat, is);
1656                 else
1657                         fas216_log(info, 0, "unknown interrupt received:"
1658                                 " phase %s inst %02X is %02X stat %02X",
1659                                 fas216_drv_phase(info), inst, is, stat);
1660                 handled = IRQ_HANDLED;
1661         }
1662         return handled;
1663 }
1664
1665 static void __fas216_start_command(FAS216_Info *info, Scsi_Cmnd *SCpnt)
1666 {
1667         int tot_msglen;
1668
1669         /* following what the ESP driver says */
1670         fas216_set_stc(info, 0);
1671         fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
1672
1673         /* flush FIFO */
1674         fas216_cmd(info, CMD_FLUSHFIFO);
1675
1676         /* load bus-id and timeout */
1677         fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
1678         fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
1679
1680         /* synchronous transfers */
1681         fas216_set_sync(info, SCpnt->device->id);
1682
1683         tot_msglen = msgqueue_msglength(&info->scsi.msgs);
1684
1685 #ifdef DEBUG_MESSAGES
1686         {
1687                 struct message *msg;
1688                 int msgnr = 0, i;
1689
1690                 printk("scsi%d.%c: message out: ",
1691                         info->host->host_no, '0' + SCpnt->device->id);
1692                 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1693                         printk("{ ");
1694                         for (i = 0; i < msg->length; i++)
1695                                 printk("%02x ", msg->msg[i]);
1696                         printk("} ");
1697                 }
1698                 printk("\n");
1699         }
1700 #endif
1701
1702         if (tot_msglen == 1 || tot_msglen == 3) {
1703                 /*
1704                  * We have an easy message length to send...
1705                  */
1706                 struct message *msg;
1707                 int msgnr = 0, i;
1708
1709                 info->scsi.phase = PHASE_SELSTEPS;
1710
1711                 /* load message bytes */
1712                 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1713                         for (i = 0; i < msg->length; i++)
1714                                 fas216_writeb(info, REG_FF, msg->msg[i]);
1715                         msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
1716                 }
1717
1718                 /* load command */
1719                 for (i = 0; i < SCpnt->cmd_len; i++)
1720                         fas216_writeb(info, REG_FF, SCpnt->cmnd[i]);
1721
1722                 if (tot_msglen == 1)
1723                         fas216_cmd(info, CMD_SELECTATN);
1724                 else
1725                         fas216_cmd(info, CMD_SELECTATN3);
1726         } else {
1727                 /*
1728                  * We have an unusual number of message bytes to send.
1729                  *  Load first byte into fifo, and issue SELECT with ATN and
1730                  *  stop steps.
1731                  */
1732                 struct message *msg = msgqueue_getmsg(&info->scsi.msgs, 0);
1733
1734                 fas216_writeb(info, REG_FF, msg->msg[0]);
1735                 msg->fifo = 1;
1736
1737                 fas216_cmd(info, CMD_SELECTATNSTOP);
1738         }
1739 }
1740
1741 /*
1742  * Decide whether we need to perform a parity test on this device.
1743  * Can also be used to force parity error conditions during initial
1744  * information transfer phase (message out) for test purposes.
1745  */
1746 static int parity_test(FAS216_Info *info, int target)
1747 {
1748 #if 0
1749         if (target == 3) {
1750                 info->device[target].parity_check = 0;
1751                 return 1;
1752         }
1753 #endif
1754         return info->device[target].parity_check;
1755 }
1756
1757 static void fas216_start_command(FAS216_Info *info, Scsi_Cmnd *SCpnt)
1758 {
1759         int disconnect_ok;
1760
1761         /*
1762          * claim host busy
1763          */
1764         info->scsi.phase = PHASE_SELECTION;
1765         info->scsi.SCp = SCpnt->SCp;
1766         info->SCpnt = SCpnt;
1767         info->dma.transfer_type = fasdma_none;
1768
1769         if (parity_test(info, SCpnt->device->id))
1770                 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_PTE);
1771         else
1772                 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
1773
1774         /*
1775          * Don't allow request sense commands to disconnect.
1776          */
1777         disconnect_ok = SCpnt->cmnd[0] != REQUEST_SENSE &&
1778                         info->device[SCpnt->device->id].disconnect_ok;
1779
1780         /*
1781          * build outgoing message bytes
1782          */
1783         msgqueue_flush(&info->scsi.msgs);
1784         msgqueue_addmsg(&info->scsi.msgs, 1, IDENTIFY(disconnect_ok, SCpnt->device->lun));
1785
1786         /*
1787          * add tag message if required
1788          */
1789         if (SCpnt->tag)
1790                 msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG, SCpnt->tag);
1791
1792         do {
1793 #ifdef SCSI2_SYNC
1794                 if ((info->device[SCpnt->device->id].sync_state == neg_wait ||
1795                      info->device[SCpnt->device->id].sync_state == neg_complete) &&
1796                     (SCpnt->cmnd[0] == REQUEST_SENSE ||
1797                      SCpnt->cmnd[0] == INQUIRY)) {
1798                         info->device[SCpnt->device->id].sync_state = neg_inprogress;
1799                         msgqueue_addmsg(&info->scsi.msgs, 5,
1800                                         EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
1801                                         1000 / info->ifcfg.clockrate,
1802                                         info->ifcfg.sync_max_depth);
1803                         break;
1804                 }
1805 #endif
1806         } while (0);
1807
1808         __fas216_start_command(info, SCpnt);
1809 }
1810
1811 static void fas216_allocate_tag(FAS216_Info *info, Scsi_Cmnd *SCpnt)
1812 {
1813 #ifdef SCSI2_TAG
1814         /*
1815          * tagged queuing - allocate a new tag to this command
1816          */
1817         if (SCpnt->device->simple_tags && SCpnt->cmnd[0] != REQUEST_SENSE &&
1818             SCpnt->cmnd[0] != INQUIRY) {
1819             SCpnt->device->current_tag += 1;
1820                 if (SCpnt->device->current_tag == 0)
1821                     SCpnt->device->current_tag = 1;
1822                         SCpnt->tag = SCpnt->device->current_tag;
1823         } else
1824 #endif
1825                 set_bit(SCpnt->device->id * 8 + SCpnt->device->lun, info->busyluns);
1826
1827         info->stats.removes += 1;
1828         switch (SCpnt->cmnd[0]) {
1829         case WRITE_6:
1830         case WRITE_10:
1831         case WRITE_12:
1832                 info->stats.writes += 1;
1833                 break;
1834         case READ_6:
1835         case READ_10:
1836         case READ_12:
1837                 info->stats.reads += 1;
1838                 break;
1839         default:
1840                 info->stats.miscs += 1;
1841                 break;
1842         }
1843 }
1844
1845 static void fas216_do_bus_device_reset(FAS216_Info *info, Scsi_Cmnd *SCpnt)
1846 {
1847         struct message *msg;
1848
1849         /*
1850          * claim host busy
1851          */
1852         info->scsi.phase = PHASE_SELECTION;
1853         info->scsi.SCp = SCpnt->SCp;
1854         info->SCpnt = SCpnt;
1855         info->dma.transfer_type = fasdma_none;
1856
1857         fas216_log(info, LOG_ERROR, "sending bus device reset");
1858
1859         msgqueue_flush(&info->scsi.msgs);
1860         msgqueue_addmsg(&info->scsi.msgs, 1, BUS_DEVICE_RESET);
1861
1862         /* following what the ESP driver says */
1863         fas216_set_stc(info, 0);
1864         fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
1865
1866         /* flush FIFO */
1867         fas216_cmd(info, CMD_FLUSHFIFO);
1868
1869         /* load bus-id and timeout */
1870         fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
1871         fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
1872
1873         /* synchronous transfers */
1874         fas216_set_sync(info, SCpnt->device->id);
1875
1876         msg = msgqueue_getmsg(&info->scsi.msgs, 0);
1877
1878         fas216_writeb(info, REG_FF, BUS_DEVICE_RESET);
1879         msg->fifo = 1;
1880
1881         fas216_cmd(info, CMD_SELECTATNSTOP);
1882 }
1883
1884 /**
1885  * fas216_kick - kick a command to the interface
1886  * @info: our host interface to kick
1887  *
1888  * Kick a command to the interface, interface should be idle.
1889  * Notes: Interrupts are always disabled!
1890  */
1891 static void fas216_kick(FAS216_Info *info)
1892 {
1893         Scsi_Cmnd *SCpnt = NULL;
1894 #define TYPE_OTHER      0
1895 #define TYPE_RESET      1
1896 #define TYPE_QUEUE      2
1897         int where_from = TYPE_OTHER;
1898
1899         fas216_checkmagic(info);
1900
1901         /*
1902          * Obtain the next command to process.
1903          */
1904         do {
1905                 if (info->rstSCpnt) {
1906                         SCpnt = info->rstSCpnt;
1907                         /* don't remove it */
1908                         where_from = TYPE_RESET;
1909                         break;
1910                 }
1911
1912                 if (info->reqSCpnt) {
1913                         SCpnt = info->reqSCpnt;
1914                         info->reqSCpnt = NULL;
1915                         break;
1916                 }
1917
1918                 if (info->origSCpnt) {
1919                         SCpnt = info->origSCpnt;
1920                         info->origSCpnt = NULL;
1921                         break;
1922                 }
1923
1924                 /* retrieve next command */
1925                 if (!SCpnt) {
1926                         SCpnt = queue_remove_exclude(&info->queues.issue,
1927                                                      info->busyluns);
1928                         where_from = TYPE_QUEUE;
1929                         break;
1930                 }
1931         } while (0);
1932
1933         if (!SCpnt) {
1934                 /*
1935                  * no command pending, so enable reselection.
1936                  */
1937                 fas216_cmd(info, CMD_ENABLESEL);
1938                 return;
1939         }
1940
1941         /*
1942          * We're going to start a command, so disable reselection
1943          */
1944         fas216_cmd(info, CMD_DISABLESEL);
1945
1946         if (info->scsi.disconnectable && info->SCpnt) {
1947                 fas216_log(info, LOG_CONNECT,
1948                         "moved command for %d to disconnected queue",
1949                         info->SCpnt->device->id);
1950                 queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
1951                 info->scsi.disconnectable = 0;
1952                 info->SCpnt = NULL;
1953         }
1954
1955         fas216_log_command(info, LOG_CONNECT | LOG_MESSAGES, SCpnt,
1956                            "starting");
1957
1958         switch (where_from) {
1959         case TYPE_QUEUE:
1960                 fas216_allocate_tag(info, SCpnt);
1961         case TYPE_OTHER:
1962                 fas216_start_command(info, SCpnt);
1963                 break;
1964         case TYPE_RESET:
1965                 fas216_do_bus_device_reset(info, SCpnt);
1966                 break;
1967         }
1968
1969         fas216_log(info, LOG_CONNECT, "select: data pointers [%p, %X]",
1970                 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1971
1972         /*
1973          * should now get either DISCONNECT or
1974          * (FUNCTION DONE with BUS SERVICE) interrupt
1975          */
1976 }
1977
1978 /*
1979  * Clean up from issuing a BUS DEVICE RESET message to a device.
1980  */
1981 static void
1982 fas216_devicereset_done(FAS216_Info *info, Scsi_Cmnd *SCpnt, unsigned int result)
1983 {
1984         fas216_log(info, LOG_ERROR, "fas216 device reset complete");
1985
1986         info->rstSCpnt = NULL;
1987         info->rst_dev_status = 1;
1988         wake_up(&info->eh_wait);
1989 }
1990
1991 /**
1992  * fas216_rq_sns_done - Finish processing automatic request sense command
1993  * @info: interface that completed
1994  * @SCpnt: command that completed
1995  * @result: driver byte of result
1996  *
1997  * Finish processing automatic request sense command
1998  */
1999 static void
2000 fas216_rq_sns_done(FAS216_Info *info, Scsi_Cmnd *SCpnt, unsigned int result)
2001 {
2002         fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
2003                    "request sense complete, result=0x%04x%02x%02x",
2004                    result, SCpnt->SCp.Message, SCpnt->SCp.Status);
2005
2006         if (result != DID_OK || SCpnt->SCp.Status != GOOD)
2007                 /*
2008                  * Something went wrong.  Make sure that we don't
2009                  * have valid data in the sense buffer that could
2010                  * confuse the higher levels.
2011                  */
2012                 memset(SCpnt->sense_buffer, 0, sizeof(SCpnt->sense_buffer));
2013 //printk("scsi%d.%c: sense buffer: ", info->host->host_no, '0' + SCpnt->device->id);
2014 //{ int i; for (i = 0; i < 32; i++) printk("%02x ", SCpnt->sense_buffer[i]); printk("\n"); }
2015         /*
2016          * Note that we don't set SCpnt->result, since that should
2017          * reflect the status of the command that we were asked by
2018          * the upper layers to process.  This would have been set
2019          * correctly by fas216_std_done.
2020          */
2021         SCpnt->scsi_done(SCpnt);
2022 }
2023
2024 /**
2025  * fas216_std_done - finish processing of standard command
2026  * @info: interface that completed
2027  * @SCpnt: command that completed
2028  * @result: driver byte of result
2029  *
2030  * Finish processing of standard command
2031  */
2032 static void
2033 fas216_std_done(FAS216_Info *info, Scsi_Cmnd *SCpnt, unsigned int result)
2034 {
2035         info->stats.fins += 1;
2036
2037         SCpnt->result = result << 16 | info->scsi.SCp.Message << 8 |
2038                         info->scsi.SCp.Status;
2039
2040         fas216_log_command(info, LOG_CONNECT, SCpnt,
2041                 "command complete, result=0x%08x", SCpnt->result);
2042
2043         /*
2044          * If the driver detected an error, we're all done.
2045          */
2046         if (host_byte(SCpnt->result) != DID_OK ||
2047             msg_byte(SCpnt->result) != COMMAND_COMPLETE)
2048                 goto done;
2049
2050         /*
2051          * If the command returned CHECK_CONDITION or COMMAND_TERMINATED
2052          * status, request the sense information.
2053          */
2054         if (status_byte(SCpnt->result) == CHECK_CONDITION ||
2055             status_byte(SCpnt->result) == COMMAND_TERMINATED)
2056                 goto request_sense;
2057
2058         /*
2059          * If the command did not complete with GOOD status,
2060          * we are all done here.
2061          */
2062         if (status_byte(SCpnt->result) != GOOD)
2063                 goto done;
2064
2065         /*
2066          * We have successfully completed a command.  Make sure that
2067          * we do not have any buffers left to transfer.  The world
2068          * is not perfect, and we seem to occasionally hit this.
2069          * It can be indicative of a buggy driver, target or the upper
2070          * levels of the SCSI code.
2071          */
2072         if (info->scsi.SCp.ptr) {
2073                 switch (SCpnt->cmnd[0]) {
2074                 case INQUIRY:
2075                 case START_STOP:
2076                 case MODE_SENSE:
2077                         break;
2078
2079                 default:
2080                         printk(KERN_ERR "scsi%d.%c: incomplete data transfer "
2081                                 "detected: res=%08X ptr=%p len=%X CDB: ",
2082                                 info->host->host_no, '0' + SCpnt->device->id,
2083                                 SCpnt->result, info->scsi.SCp.ptr,
2084                                 info->scsi.SCp.this_residual);
2085                         __scsi_print_command(SCpnt->cmnd);
2086                         SCpnt->result &= ~(255 << 16);
2087                         SCpnt->result |= DID_BAD_TARGET << 16;
2088                         goto request_sense;
2089                 }
2090         }
2091
2092 done:
2093         if (SCpnt->scsi_done) {
2094                 SCpnt->scsi_done(SCpnt);
2095                 return;
2096         }
2097
2098         panic("scsi%d.H: null scsi_done function in fas216_done",
2099                 info->host->host_no);
2100
2101
2102 request_sense:
2103         if (SCpnt->cmnd[0] == REQUEST_SENSE)
2104                 goto done;
2105
2106         fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
2107                           "requesting sense");
2108         memset(SCpnt->cmnd, 0, sizeof (SCpnt->cmnd));
2109         SCpnt->cmnd[0] = REQUEST_SENSE;
2110         SCpnt->cmnd[1] = SCpnt->device->lun << 5;
2111         SCpnt->cmnd[4] = sizeof(SCpnt->sense_buffer);
2112         SCpnt->cmd_len = COMMAND_SIZE(SCpnt->cmnd[0]);
2113         SCpnt->SCp.buffer = NULL;
2114         SCpnt->SCp.buffers_residual = 0;
2115         SCpnt->SCp.ptr = (char *)SCpnt->sense_buffer;
2116         SCpnt->SCp.this_residual = sizeof(SCpnt->sense_buffer);
2117         SCpnt->SCp.Message = 0;
2118         SCpnt->SCp.Status = 0;
2119         SCpnt->request_bufflen = sizeof(SCpnt->sense_buffer);
2120         SCpnt->sc_data_direction = DMA_FROM_DEVICE;
2121         SCpnt->use_sg = 0;
2122         SCpnt->tag = 0;
2123         SCpnt->host_scribble = (void *)fas216_rq_sns_done;
2124
2125         /*
2126          * Place this command into the high priority "request
2127          * sense" slot.  This will be the very next command
2128          * executed, unless a target connects to us.
2129          */
2130         if (info->reqSCpnt)
2131                 printk(KERN_WARNING "scsi%d.%c: loosing request command\n",
2132                         info->host->host_no, '0' + SCpnt->device->id);
2133         info->reqSCpnt = SCpnt;
2134 }
2135
2136 /**
2137  * fas216_done - complete processing for current command
2138  * @info: interface that completed
2139  * @result: driver byte of result
2140  *
2141  * Complete processing for current command
2142  */
2143 static void fas216_done(FAS216_Info *info, unsigned int result)
2144 {
2145         void (*fn)(FAS216_Info *, Scsi_Cmnd *, unsigned int);
2146         Scsi_Cmnd *SCpnt;
2147         unsigned long flags;
2148
2149         fas216_checkmagic(info);
2150
2151         if (!info->SCpnt)
2152                 goto no_command;
2153
2154         SCpnt = info->SCpnt;
2155         info->SCpnt = NULL;
2156         info->scsi.phase = PHASE_IDLE;
2157
2158         if (info->scsi.aborting) {
2159                 fas216_log(info, 0, "uncaught abort - returning DID_ABORT");
2160                 result = DID_ABORT;
2161                 info->scsi.aborting = 0;
2162         }
2163
2164         /*
2165          * Sanity check the completion - if we have zero bytes left
2166          * to transfer, we should not have a valid pointer.
2167          */
2168         if (info->scsi.SCp.ptr && info->scsi.SCp.this_residual == 0) {
2169                 printk("scsi%d.%c: zero bytes left to transfer, but "
2170                        "buffer pointer still valid: ptr=%p len=%08x CDB: ",
2171                        info->host->host_no, '0' + SCpnt->device->id,
2172                        info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
2173                 info->scsi.SCp.ptr = NULL;
2174                 __scsi_print_command(SCpnt->cmnd);
2175         }
2176
2177         /*
2178          * Clear down this command as completed.  If we need to request
2179          * the sense information, fas216_kick will re-assert the busy
2180          * status.
2181          */
2182         info->device[SCpnt->device->id].parity_check = 0;
2183         clear_bit(SCpnt->device->id * 8 + SCpnt->device->lun, info->busyluns);
2184
2185         fn = (void (*)(FAS216_Info *, Scsi_Cmnd *, unsigned int))SCpnt->host_scribble;
2186         fn(info, SCpnt, result);
2187
2188         if (info->scsi.irq != NO_IRQ) {
2189                 spin_lock_irqsave(&info->host_lock, flags);
2190                 if (info->scsi.phase == PHASE_IDLE)
2191                         fas216_kick(info);
2192                 spin_unlock_irqrestore(&info->host_lock, flags);
2193         }
2194         return;
2195
2196 no_command:
2197         panic("scsi%d.H: null command in fas216_done",
2198                 info->host->host_no);
2199 }
2200
2201 /**
2202  * fas216_queue_command - queue a command for adapter to process.
2203  * @SCpnt: Command to queue
2204  * @done: done function to call once command is complete
2205  *
2206  * Queue a command for adapter to process.
2207  * Returns: 0 on success, else error.
2208  * Notes: io_request_lock is held, interrupts are disabled.
2209  */
2210 int fas216_queue_command(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *))
2211 {
2212         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2213         int result;
2214
2215         fas216_checkmagic(info);
2216
2217         fas216_log_command(info, LOG_CONNECT, SCpnt,
2218                            "received command (%p)", SCpnt);
2219
2220         SCpnt->scsi_done = done;
2221         SCpnt->host_scribble = (void *)fas216_std_done;
2222         SCpnt->result = 0;
2223
2224         init_SCp(SCpnt);
2225
2226         info->stats.queues += 1;
2227         SCpnt->tag = 0;
2228
2229         spin_lock(&info->host_lock);
2230
2231         /*
2232          * Add command into execute queue and let it complete under
2233          * whatever scheme we're using.
2234          */
2235         result = !queue_add_cmd_ordered(&info->queues.issue, SCpnt);
2236
2237         /*
2238          * If we successfully added the command,
2239          * kick the interface to get it moving.
2240          */
2241         if (result == 0 && info->scsi.phase == PHASE_IDLE)
2242                 fas216_kick(info);
2243         spin_unlock(&info->host_lock);
2244
2245         fas216_log_target(info, LOG_CONNECT, -1, "queue %s",
2246                 result ? "failure" : "success");
2247
2248         return result;
2249 }
2250
2251 /**
2252  * fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command
2253  * @SCpnt: Command to wake
2254  *
2255  * Trigger restart of a waiting thread in fas216_command
2256  */
2257 static void fas216_internal_done(Scsi_Cmnd *SCpnt)
2258 {
2259         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2260
2261         fas216_checkmagic(info);
2262
2263         info->internal_done = 1;
2264 }
2265
2266 /**
2267  * fas216_noqueue_command - process a command for the adapter.
2268  * @SCpnt: Command to queue
2269  *
2270  * Queue a command for adapter to process.
2271  * Returns: scsi result code.
2272  * Notes: io_request_lock is held, interrupts are disabled.
2273  */
2274 int fas216_noqueue_command(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *))
2275 {
2276         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2277
2278         fas216_checkmagic(info);
2279
2280         /*
2281          * We should only be using this if we don't have an interrupt.
2282          * Provide some "incentive" to use the queueing code.
2283          */
2284         BUG_ON(info->scsi.irq != NO_IRQ);
2285
2286         info->internal_done = 0;
2287         fas216_queue_command(SCpnt, fas216_internal_done);
2288
2289         /*
2290          * This wastes time, since we can't return until the command is
2291          * complete. We can't sleep either since we may get re-entered!
2292          * However, we must re-enable interrupts, or else we'll be
2293          * waiting forever.
2294          */
2295         spin_unlock_irq(info->host->host_lock);
2296
2297         while (!info->internal_done) {
2298                 /*
2299                  * If we don't have an IRQ, then we must poll the card for
2300                  * it's interrupt, and use that to call this driver's
2301                  * interrupt routine.  That way, we keep the command
2302                  * progressing.  Maybe we can add some inteligence here
2303                  * and go to sleep if we know that the device is going
2304                  * to be some time (eg, disconnected).
2305                  */
2306                 if (fas216_readb(info, REG_STAT) & STAT_INT) {
2307                         spin_lock_irq(info->host->host_lock);
2308                         fas216_intr(info);
2309                         spin_unlock_irq(info->host->host_lock);
2310                 }
2311         }
2312
2313         spin_lock_irq(info->host->host_lock);
2314
2315         done(SCpnt);
2316
2317         return 0;
2318 }
2319
2320 /*
2321  * Error handler timeout function.  Indicate that we timed out,
2322  * and wake up any error handler process so it can continue.
2323  */
2324 static void fas216_eh_timer(unsigned long data)
2325 {
2326         FAS216_Info *info = (FAS216_Info *)data;
2327
2328         fas216_log(info, LOG_ERROR, "error handling timed out\n");
2329
2330         del_timer(&info->eh_timer);
2331
2332         if (info->rst_bus_status == 0)
2333                 info->rst_bus_status = -1;
2334         if (info->rst_dev_status == 0)
2335                 info->rst_dev_status = -1;
2336
2337         wake_up(&info->eh_wait);
2338 }
2339
2340 enum res_find {
2341         res_failed,             /* not found                    */
2342         res_success,            /* command on issue queue       */
2343         res_hw_abort            /* command on disconnected dev  */
2344 };
2345
2346 /**
2347  * fas216_do_abort - decide how to abort a command
2348  * @SCpnt: command to abort
2349  *
2350  * Decide how to abort a command.
2351  * Returns: abort status
2352  */
2353 static enum res_find fas216_find_command(FAS216_Info *info, Scsi_Cmnd *SCpnt)
2354 {
2355         enum res_find res = res_failed;
2356
2357         if (queue_remove_cmd(&info->queues.issue, SCpnt)) {
2358                 /*
2359                  * The command was on the issue queue, and has not been
2360                  * issued yet.  We can remove the command from the queue,
2361                  * and acknowledge the abort.  Neither the device nor the
2362                  * interface know about the command.
2363                  */
2364                 printk("on issue queue ");
2365
2366                 res = res_success;
2367         } else if (queue_remove_cmd(&info->queues.disconnected, SCpnt)) {
2368                 /*
2369                  * The command was on the disconnected queue.  We must
2370                  * reconnect with the device if possible, and send it
2371                  * an abort message.
2372                  */
2373                 printk("on disconnected queue ");
2374
2375                 res = res_hw_abort;
2376         } else if (info->SCpnt == SCpnt) {
2377                 printk("executing ");
2378
2379                 switch (info->scsi.phase) {
2380                 /*
2381                  * If the interface is idle, and the command is 'disconnectable',
2382                  * then it is the same as on the disconnected queue.
2383                  */
2384                 case PHASE_IDLE:
2385                         if (info->scsi.disconnectable) {
2386                                 info->scsi.disconnectable = 0;
2387                                 info->SCpnt = NULL;
2388                                 res = res_hw_abort;
2389                         }
2390                         break;
2391
2392                 default:
2393                         break;
2394                 }
2395         } else if (info->origSCpnt == SCpnt) {
2396                 /*
2397                  * The command will be executed next, but a command
2398                  * is currently using the interface.  This is similar to
2399                  * being on the issue queue, except the busylun bit has
2400                  * been set.
2401                  */
2402                 info->origSCpnt = NULL;
2403                 clear_bit(SCpnt->device->id * 8 + SCpnt->device->lun, info->busyluns);
2404                 printk("waiting for execution ");
2405                 res = res_success;
2406         } else
2407                 printk("unknown ");
2408
2409         return res;
2410 }
2411
2412 /**
2413  * fas216_eh_abort - abort this command
2414  * @SCpnt: command to abort
2415  *
2416  * Abort this command.
2417  * Returns: FAILED if unable to abort
2418  * Notes: io_request_lock is taken, and irqs are disabled
2419  */
2420 int fas216_eh_abort(Scsi_Cmnd *SCpnt)
2421 {
2422         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2423         int result = FAILED;
2424
2425         fas216_checkmagic(info);
2426
2427         info->stats.aborts += 1;
2428
2429         printk(KERN_WARNING "scsi%d: abort command ", info->host->host_no);
2430         __scsi_print_command(SCpnt->cmnd);
2431
2432         print_debug_list();
2433         fas216_dumpstate(info);
2434
2435         printk(KERN_WARNING "scsi%d: abort %p ", info->host->host_no, SCpnt);
2436
2437         switch (fas216_find_command(info, SCpnt)) {
2438         /*
2439          * We found the command, and cleared it out.  Either
2440          * the command is still known to be executing on the
2441          * target, or the busylun bit is not set.
2442          */
2443         case res_success:
2444                 printk("success\n");
2445                 result = SUCCESS;
2446                 break;
2447
2448         /*
2449          * We need to reconnect to the target and send it an
2450          * ABORT or ABORT_TAG message.  We can only do this
2451          * if the bus is free.
2452          */
2453         case res_hw_abort:
2454
2455
2456         /*
2457          * We are unable to abort the command for some reason.
2458          */
2459         default:
2460         case res_failed:
2461                 printk("failed\n");
2462                 break;
2463         }
2464
2465         return result;
2466 }
2467
2468 /**
2469  * fas216_eh_device_reset - Reset the device associated with this command
2470  * @SCpnt: command specifing device to reset
2471  *
2472  * Reset the device associated with this command.
2473  * Returns: FAILED if unable to reset.
2474  * Notes: We won't be re-entered, so we'll only have one device
2475  * reset on the go at one time.
2476  */
2477 int fas216_eh_device_reset(Scsi_Cmnd *SCpnt)
2478 {
2479         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2480         unsigned long flags;
2481         int i, res = FAILED, target = SCpnt->device->id;
2482
2483         fas216_log(info, LOG_ERROR, "device reset for target %d", target);
2484
2485         spin_lock_irqsave(&info->host_lock, flags);
2486
2487         do {
2488                 /*
2489                  * If we are currently connected to a device, and
2490                  * it is the device we want to reset, there is
2491                  * nothing we can do here.  Chances are it is stuck,
2492                  * and we need a bus reset.
2493                  */
2494                 if (info->SCpnt && !info->scsi.disconnectable &&
2495                     info->SCpnt->device->id == SCpnt->device->id)
2496                         break;
2497
2498                 /*
2499                  * We're going to be resetting this device.  Remove
2500                  * all pending commands from the driver.  By doing
2501                  * so, we guarantee that we won't touch the command
2502                  * structures except to process the reset request.
2503                  */
2504                 queue_remove_all_target(&info->queues.issue, target);
2505                 queue_remove_all_target(&info->queues.disconnected, target);
2506                 if (info->origSCpnt && info->origSCpnt->device->id == target)
2507                         info->origSCpnt = NULL;
2508                 if (info->reqSCpnt && info->reqSCpnt->device->id == target)
2509                         info->reqSCpnt = NULL;
2510                 for (i = 0; i < 8; i++)
2511                         clear_bit(target * 8 + i, info->busyluns);
2512
2513                 /*
2514                  * Hijack this SCSI command structure to send
2515                  * a bus device reset message to this device.
2516                  */
2517                 SCpnt->host_scribble = (void *)fas216_devicereset_done;
2518
2519                 info->rst_dev_status = 0;
2520                 info->rstSCpnt = SCpnt;
2521
2522                 if (info->scsi.phase == PHASE_IDLE)
2523                         fas216_kick(info);
2524
2525                 mod_timer(&info->eh_timer, 30 * HZ);
2526                 spin_unlock_irqrestore(&info->host_lock, flags);
2527
2528                 /*
2529                  * Wait up to 30 seconds for the reset to complete.
2530                  */
2531                 wait_event(info->eh_wait, info->rst_dev_status);
2532
2533                 del_timer_sync(&info->eh_timer);
2534                 spin_lock_irqsave(&info->host_lock, flags);
2535                 info->rstSCpnt = NULL;
2536
2537                 if (info->rst_dev_status == 1)
2538                         res = SUCCESS;
2539         } while (0);
2540
2541         SCpnt->host_scribble = NULL;
2542         spin_unlock_irqrestore(&info->host_lock, flags);
2543
2544         fas216_log(info, LOG_ERROR, "device reset complete: %s\n",
2545                    res == SUCCESS ? "success" : "failed");
2546
2547         return res;
2548 }
2549
2550 /**
2551  * fas216_eh_bus_reset - Reset the bus associated with the command
2552  * @SCpnt: command specifing bus to reset
2553  *
2554  * Reset the bus associated with the command.
2555  * Returns: FAILED if unable to reset.
2556  * Notes: Further commands are blocked.
2557  */
2558 int fas216_eh_bus_reset(Scsi_Cmnd *SCpnt)
2559 {
2560         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2561         unsigned long flags;
2562         struct scsi_device *SDpnt;
2563
2564         fas216_checkmagic(info);
2565         fas216_log(info, LOG_ERROR, "resetting bus");
2566
2567         info->stats.bus_resets += 1;
2568
2569         spin_lock_irqsave(&info->host_lock, flags);
2570
2571         /*
2572          * Stop all activity on this interface.
2573          */
2574         fas216_aborttransfer(info);
2575         fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
2576
2577         /*
2578          * Clear any pending interrupts.
2579          */
2580         while (fas216_readb(info, REG_STAT) & STAT_INT)
2581                 fas216_readb(info, REG_INST);
2582
2583         info->rst_bus_status = 0;
2584
2585         /*
2586          * For each attached hard-reset device, clear out
2587          * all command structures.  Leave the running
2588          * command in place.
2589          */
2590         shost_for_each_device(SDpnt, info->host) {
2591                 int i;
2592
2593                 if (SDpnt->soft_reset)
2594                         continue;
2595
2596                 queue_remove_all_target(&info->queues.issue, SDpnt->id);
2597                 queue_remove_all_target(&info->queues.disconnected, SDpnt->id);
2598                 if (info->origSCpnt && info->origSCpnt->device->id == SDpnt->id)
2599                         info->origSCpnt = NULL;
2600                 if (info->reqSCpnt && info->reqSCpnt->device->id == SDpnt->id)
2601                         info->reqSCpnt = NULL;
2602                 info->SCpnt = NULL;
2603
2604                 for (i = 0; i < 8; i++)
2605                         clear_bit(SDpnt->id * 8 + i, info->busyluns);
2606         }
2607
2608         info->scsi.phase = PHASE_IDLE;
2609
2610         /*
2611          * Reset the SCSI bus.  Device cleanup happens in
2612          * the interrupt handler.
2613          */
2614         fas216_cmd(info, CMD_RESETSCSI);
2615
2616         mod_timer(&info->eh_timer, jiffies + HZ);
2617         spin_unlock_irqrestore(&info->host_lock, flags);
2618
2619         /*
2620          * Wait one second for the interrupt.
2621          */
2622         wait_event(info->eh_wait, info->rst_bus_status);
2623         del_timer_sync(&info->eh_timer);
2624
2625         fas216_log(info, LOG_ERROR, "bus reset complete: %s\n",
2626                    info->rst_bus_status == 1 ? "success" : "failed");
2627
2628         return info->rst_bus_status == 1 ? SUCCESS : FAILED;
2629 }
2630
2631 /**
2632  * fas216_init_chip - Initialise FAS216 state after reset
2633  * @info: state structure for interface
2634  *
2635  * Initialise FAS216 state after reset
2636  */
2637 static void fas216_init_chip(FAS216_Info *info)
2638 {
2639         unsigned int clock = ((info->ifcfg.clockrate - 1) / 5 + 1) & 7;
2640         fas216_writeb(info, REG_CLKF, clock);
2641         fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2642         fas216_writeb(info, REG_CNTL2, info->scsi.cfg[1]);
2643         fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
2644         fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
2645         fas216_writeb(info, REG_SOF, 0);
2646         fas216_writeb(info, REG_STP, info->scsi.async_stp);
2647         fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2648 }
2649
2650 /**
2651  * fas216_eh_host_reset - Reset the host associated with this command
2652  * @SCpnt: command specifing host to reset
2653  *
2654  * Reset the host associated with this command.
2655  * Returns: FAILED if unable to reset.
2656  * Notes: io_request_lock is taken, and irqs are disabled
2657  */
2658 int fas216_eh_host_reset(Scsi_Cmnd *SCpnt)
2659 {
2660         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2661
2662         spin_lock_irq(info->host->host_lock);
2663
2664         fas216_checkmagic(info);
2665
2666         printk("scsi%d.%c: %s: resetting host\n",
2667                 info->host->host_no, '0' + SCpnt->device->id, __FUNCTION__);
2668
2669         /*
2670          * Reset the SCSI chip.
2671          */
2672         fas216_cmd(info, CMD_RESETCHIP);
2673
2674         /*
2675          * Ugly ugly ugly!
2676          * We need to release the host_lock and enable
2677          * IRQs if we sleep, but we must relock and disable
2678          * IRQs after the sleep.
2679          */
2680         spin_unlock_irq(info->host->host_lock);
2681         msleep(50 * 1000/100);
2682         spin_lock_irq(info->host->host_lock);
2683
2684         /*
2685          * Release the SCSI reset.
2686          */
2687         fas216_cmd(info, CMD_NOP);
2688
2689         fas216_init_chip(info);
2690
2691         spin_unlock_irq(info->host->host_lock);
2692         return SUCCESS;
2693 }
2694
2695 #define TYPE_UNKNOWN    0
2696 #define TYPE_NCR53C90   1
2697 #define TYPE_NCR53C90A  2
2698 #define TYPE_NCR53C9x   3
2699 #define TYPE_Am53CF94   4
2700 #define TYPE_EmFAS216   5
2701 #define TYPE_QLFAS216   6
2702
2703 static char *chip_types[] = {
2704         "unknown",
2705         "NS NCR53C90",
2706         "NS NCR53C90A",
2707         "NS NCR53C9x",
2708         "AMD Am53CF94",
2709         "Emulex FAS216",
2710         "QLogic FAS216"
2711 };
2712
2713 static int fas216_detect_type(FAS216_Info *info)
2714 {
2715         int family, rev;
2716
2717         /*
2718          * Reset the chip.
2719          */
2720         fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2721         udelay(50);
2722         fas216_writeb(info, REG_CMD, CMD_NOP);
2723
2724         /*
2725          * Check to see if control reg 2 is present.
2726          */
2727         fas216_writeb(info, REG_CNTL3, 0);
2728         fas216_writeb(info, REG_CNTL2, CNTL2_S2FE);
2729
2730         /*
2731          * If we are unable to read back control reg 2
2732          * correctly, it is not present, and we have a
2733          * NCR53C90.
2734          */
2735         if ((fas216_readb(info, REG_CNTL2) & (~0xe0)) != CNTL2_S2FE)
2736                 return TYPE_NCR53C90;
2737
2738         /*
2739          * Now, check control register 3
2740          */
2741         fas216_writeb(info, REG_CNTL2, 0);
2742         fas216_writeb(info, REG_CNTL3, 0);
2743         fas216_writeb(info, REG_CNTL3, 5);
2744
2745         /*
2746          * If we are unable to read the register back
2747          * correctly, we have a NCR53C90A
2748          */
2749         if (fas216_readb(info, REG_CNTL3) != 5)
2750                 return TYPE_NCR53C90A;
2751
2752         /*
2753          * Now read the ID from the chip.
2754          */
2755         fas216_writeb(info, REG_CNTL3, 0);
2756
2757         fas216_writeb(info, REG_CNTL3, CNTL3_ADIDCHK);
2758         fas216_writeb(info, REG_CNTL3, 0);
2759
2760         fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2761         udelay(50);
2762         fas216_writeb(info, REG_CMD, CMD_WITHDMA | CMD_NOP);
2763
2764         fas216_writeb(info, REG_CNTL2, CNTL2_ENF);
2765         fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2766         udelay(50);
2767         fas216_writeb(info, REG_CMD, CMD_NOP);
2768
2769         rev     = fas216_readb(info, REG_ID);
2770         family  = rev >> 3;
2771         rev    &= 7;
2772
2773         switch (family) {
2774         case 0x01:
2775                 if (rev == 4)
2776                         return TYPE_Am53CF94;
2777                 break;
2778
2779         case 0x02:
2780                 switch (rev) {
2781                 case 2:
2782                         return TYPE_EmFAS216;
2783                 case 3:
2784                         return TYPE_QLFAS216;
2785                 }
2786                 break;
2787
2788         default:
2789                 break;
2790         }
2791         printk("family %x rev %x\n", family, rev);
2792         return TYPE_NCR53C9x;
2793 }
2794
2795 /**
2796  * fas216_reset_state - Initialise driver internal state
2797  * @info: state to initialise
2798  *
2799  * Initialise driver internal state
2800  */
2801 static void fas216_reset_state(FAS216_Info *info)
2802 {
2803         int i;
2804
2805         fas216_checkmagic(info);
2806
2807         fas216_bus_reset(info);
2808
2809         /*
2810          * Clear out all stale info in our state structure
2811          */
2812         memset(info->busyluns, 0, sizeof(info->busyluns));
2813         info->scsi.disconnectable = 0;
2814         info->scsi.aborting = 0;
2815
2816         for (i = 0; i < 8; i++) {
2817                 info->device[i].parity_enabled  = 0;
2818                 info->device[i].parity_check    = 1;
2819         }
2820
2821         /*
2822          * Drain all commands on disconnected queue
2823          */
2824         while (queue_remove(&info->queues.disconnected) != NULL);
2825
2826         /*
2827          * Remove executing commands.
2828          */
2829         info->SCpnt     = NULL;
2830         info->reqSCpnt  = NULL;
2831         info->rstSCpnt  = NULL;
2832         info->origSCpnt = NULL;
2833 }
2834
2835 /**
2836  * fas216_init - initialise FAS/NCR/AMD SCSI structures.
2837  * @host: a driver-specific filled-out structure
2838  *
2839  * Initialise FAS/NCR/AMD SCSI structures.
2840  * Returns: 0 on success
2841  */
2842 int fas216_init(struct Scsi_Host *host)
2843 {
2844         FAS216_Info *info = (FAS216_Info *)host->hostdata;
2845
2846         info->magic_start    = MAGIC;
2847         info->magic_end      = MAGIC;
2848         info->host           = host;
2849         info->scsi.cfg[0]    = host->this_id | CNTL1_PERE;
2850         info->scsi.cfg[1]    = CNTL2_ENF | CNTL2_S2FE;
2851         info->scsi.cfg[2]    = info->ifcfg.cntl3 |
2852                                CNTL3_ADIDCHK | CNTL3_QTAG | CNTL3_G2CB | CNTL3_LBTM;
2853         info->scsi.async_stp = fas216_syncperiod(info, info->ifcfg.asyncperiod);
2854
2855         info->rst_dev_status = -1;
2856         info->rst_bus_status = -1;
2857         init_waitqueue_head(&info->eh_wait);
2858         init_timer(&info->eh_timer);
2859         info->eh_timer.data  = (unsigned long)info;
2860         info->eh_timer.function = fas216_eh_timer;
2861
2862         spin_lock_init(&info->host_lock);
2863
2864         memset(&info->stats, 0, sizeof(info->stats));
2865
2866         msgqueue_initialise(&info->scsi.msgs);
2867
2868         if (!queue_initialise(&info->queues.issue))
2869                 return -ENOMEM;
2870
2871         if (!queue_initialise(&info->queues.disconnected)) {
2872                 queue_free(&info->queues.issue);
2873                 return -ENOMEM;
2874         }
2875
2876         return 0;
2877 }
2878
2879 /**
2880  * fas216_add - initialise FAS/NCR/AMD SCSI ic.
2881  * @host: a driver-specific filled-out structure
2882  * @dev: parent device
2883  *
2884  * Initialise FAS/NCR/AMD SCSI ic.
2885  * Returns: 0 on success
2886  */
2887 int fas216_add(struct Scsi_Host *host, struct device *dev)
2888 {
2889         FAS216_Info *info = (FAS216_Info *)host->hostdata;
2890         int type, ret;
2891
2892         if (info->ifcfg.clockrate <= 10 || info->ifcfg.clockrate > 40) {
2893                 printk(KERN_CRIT "fas216: invalid clock rate %u MHz\n",
2894                         info->ifcfg.clockrate);
2895                 return -EINVAL;
2896         }
2897
2898         fas216_reset_state(info);
2899         type = fas216_detect_type(info);
2900         info->scsi.type = chip_types[type];
2901
2902         udelay(300);
2903
2904         /*
2905          * Initialise the chip correctly.
2906          */
2907         fas216_init_chip(info);
2908
2909         /*
2910          * Reset the SCSI bus.  We don't want to see
2911          * the resulting reset interrupt, so mask it
2912          * out.
2913          */
2914         fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_DISR);
2915         fas216_writeb(info, REG_CMD, CMD_RESETSCSI);
2916
2917         /*
2918          * scsi standard says wait 250ms
2919          */
2920         spin_unlock_irq(info->host->host_lock);
2921         msleep(100*1000/100);
2922         spin_lock_irq(info->host->host_lock);
2923
2924         fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2925         fas216_readb(info, REG_INST);
2926
2927         fas216_checkmagic(info);
2928
2929         ret = scsi_add_host(host, dev);
2930         if (ret)
2931                 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2932         else
2933                 scsi_scan_host(host);
2934
2935         return ret;
2936 }
2937
2938 void fas216_remove(struct Scsi_Host *host)
2939 {
2940         FAS216_Info *info = (FAS216_Info *)host->hostdata;
2941
2942         fas216_checkmagic(info);
2943         scsi_remove_host(host);
2944
2945         fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2946         scsi_host_put(host);
2947 }
2948
2949 /**
2950  * fas216_release - release all resources for FAS/NCR/AMD SCSI ic.
2951  * @host: a driver-specific filled-out structure
2952  *
2953  * release all resources and put everything to bed for FAS/NCR/AMD SCSI ic.
2954  */
2955 void fas216_release(struct Scsi_Host *host)
2956 {
2957         FAS216_Info *info = (FAS216_Info *)host->hostdata;
2958
2959         queue_free(&info->queues.disconnected);
2960         queue_free(&info->queues.issue);
2961 }
2962
2963 int fas216_print_host(FAS216_Info *info, char *buffer)
2964 {
2965         return sprintf(buffer,
2966                         "\n"
2967                         "Chip    : %s\n"
2968                         " Address: 0x%p\n"
2969                         " IRQ    : %d\n"
2970                         " DMA    : %d\n",
2971                         info->scsi.type, info->scsi.io_base,
2972                         info->scsi.irq, info->scsi.dma);
2973 }
2974
2975 int fas216_print_stats(FAS216_Info *info, char *buffer)
2976 {
2977         char *p = buffer;
2978
2979         p += sprintf(p, "\n"
2980                         "Command Statistics:\n"
2981                         " Queued     : %u\n"
2982                         " Issued     : %u\n"
2983                         " Completed  : %u\n"
2984                         " Reads      : %u\n"
2985                         " Writes     : %u\n"
2986                         " Others     : %u\n"
2987                         " Disconnects: %u\n"
2988                         " Aborts     : %u\n"
2989                         " Bus resets : %u\n"
2990                         " Host resets: %u\n",
2991                         info->stats.queues,      info->stats.removes,
2992                         info->stats.fins,        info->stats.reads,
2993                         info->stats.writes,      info->stats.miscs,
2994                         info->stats.disconnects, info->stats.aborts,
2995                         info->stats.bus_resets,  info->stats.host_resets);
2996
2997         return p - buffer;
2998 }
2999
3000 int fas216_print_devices(FAS216_Info *info, char *buffer)
3001 {
3002         struct fas216_device *dev;
3003         struct scsi_device *scd;
3004         char *p = buffer;
3005
3006         p += sprintf(p, "Device/Lun TaggedQ       Parity   Sync\n");
3007
3008         shost_for_each_device(scd, info->host) {
3009                 dev = &info->device[scd->id];
3010                 p += sprintf(p, "     %d/%d   ", scd->id, scd->lun);
3011                 if (scd->tagged_supported)
3012                         p += sprintf(p, "%3sabled(%3d) ",
3013                                      scd->simple_tags ? "en" : "dis",
3014                                      scd->current_tag);
3015                 else
3016                         p += sprintf(p, "unsupported   ");
3017
3018                 p += sprintf(p, "%3sabled ", dev->parity_enabled ? "en" : "dis");
3019
3020                 if (dev->sof)
3021                         p += sprintf(p, "offset %d, %d ns\n",
3022                                      dev->sof, dev->period * 4);
3023                 else
3024                         p += sprintf(p, "async\n");
3025         }
3026
3027         return p - buffer;
3028 }
3029
3030 EXPORT_SYMBOL(fas216_init);
3031 EXPORT_SYMBOL(fas216_add);
3032 EXPORT_SYMBOL(fas216_queue_command);
3033 EXPORT_SYMBOL(fas216_noqueue_command);
3034 EXPORT_SYMBOL(fas216_intr);
3035 EXPORT_SYMBOL(fas216_remove);
3036 EXPORT_SYMBOL(fas216_release);
3037 EXPORT_SYMBOL(fas216_eh_abort);
3038 EXPORT_SYMBOL(fas216_eh_device_reset);
3039 EXPORT_SYMBOL(fas216_eh_bus_reset);
3040 EXPORT_SYMBOL(fas216_eh_host_reset);
3041 EXPORT_SYMBOL(fas216_print_host);
3042 EXPORT_SYMBOL(fas216_print_stats);
3043 EXPORT_SYMBOL(fas216_print_devices);
3044
3045 MODULE_AUTHOR("Russell King");
3046 MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core");
3047 MODULE_LICENSE("GPL");