drivers/scsi/arm/fas216.c

   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/proc_fs.h>
  43 #include <linux/delay.h>
  44 #include <linux/bitops.h>
  45 #include <linux/init.h>
  46 #include <linux/interrupt.h>
  47
  48 #include <asm/dma.h>
  49 #include <asm/io.h>
  50 #include <asm/irq.h>
  51 #include <asm/ecard.h>
  52
  53 #include "../scsi.h"
  54 #include <scsi/scsi_dbg.h>
  55 #include <scsi/scsi_host.h>
  56 #include "fas216.h"
  57 #include "scsi.h"
  58
  59 /* NOTE: SCSI2 Synchronous transfers *require* DMA according to
  60  *  the data sheet.  This restriction is crazy, especially when
  61  *  you only want to send 16 bytes!  What were the guys who
  62  *  designed this chip on at that time?  Did they read the SCSI2
  63  *  spec at all?  The following sections are taken from the SCSI2
  64  *  standard (s2r10) concerning this:
  65  *
  66  * > IMPLEMENTORS NOTES:
  67  * >   (1)  Re-negotiation at every selection is not recommended, since a
  68  * >   significant performance impact is likely.
  69  *
  70  * >  The implied synchronous agreement shall remain in effect until a BUS DEVICE
  71  * >  RESET message is received, until a hard reset condition occurs, or until one
  72  * >  of the two SCSI devices elects to modify the agreement.  The default data
  73  * >  transfer mode is asynchronous data transfer mode.  The default data transfer
  74  * >  mode is entered at power on, after a BUS DEVICE RESET message, or after a hard
  75  * >  reset condition.
  76  *
  77  *  In total, this means that once you have elected to use synchronous
  78  *  transfers, you must always use DMA.
  79  *
  80  *  I was thinking that this was a good chip until I found this restriction ;(
  81  */
  82 #define SCSI2_SYNC
  83 #undef  SCSI2_TAG
  84
  85 #undef DEBUG_CONNECT
  86 #undef DEBUG_MESSAGES
  87
  88 #undef CHECK_STRUCTURE
  89
  90 #define LOG_CONNECT             (1 << 0)
  91 #define LOG_BUSSERVICE          (1 << 1)
  92 #define LOG_FUNCTIONDONE        (1 << 2)
  93 #define LOG_MESSAGES            (1 << 3)
  94 #define LOG_BUFFER              (1 << 4)
  95 #define LOG_ERROR               (1 << 8)
  96
  97 static int level_mask = LOG_ERROR;
  98
  99 module_param(level_mask, int, 0644);
 100
 101 static int __init fas216_log_setup(char *str)
 102 {
 103         char *s;
 104
 105         level_mask = 0;
 106
 107         while ((s = strsep(&str, ",")) != NULL) {
 108                 switch (s[0]) {
 109                 case 'a':
 110                         if (strcmp(s, "all") == 0)
 111                                 level_mask |= -1;
 112                         break;
 113                 case 'b':
 114                         if (strncmp(s, "bus", 3) == 0)
 115                                 level_mask |= LOG_BUSSERVICE;
 116                         if (strncmp(s, "buf", 3) == 0)
 117                                 level_mask |= LOG_BUFFER;
 118                         break;
 119                 case 'c':
 120                         level_mask |= LOG_CONNECT;
 121                         break;
 122                 case 'e':
 123                         level_mask |= LOG_ERROR;
 124                         break;
 125                 case 'm':
 126                         level_mask |= LOG_MESSAGES;
 127                         break;
 128                 case 'n':
 129                         if (strcmp(s, "none") == 0)
 130                                 level_mask = 0;
 131                         break;
 132                 case 's':
 133                         level_mask |= LOG_FUNCTIONDONE;
 134                         break;
 135                 }
 136         }
 137         return 1;
 138 }
 139
 140 __setup("fas216_logging=", fas216_log_setup);
 141
 142 static inline unsigned char fas216_readb(FAS216_Info *info, unsigned int reg)
 143 {
 144         unsigned int off = reg << info->scsi.io_shift;
 145         return readb(info->scsi.io_base + off);
 146 }
 147
 148 static inline void fas216_writeb(FAS216_Info *info, unsigned int reg, unsigned int val)
 149 {
 150         unsigned int off = reg << info->scsi.io_shift;
 151         writeb(val, info->scsi.io_base + off);
 152 }
 153
 154 static void fas216_dumpstate(FAS216_Info *info)
 155 {
 156         unsigned char is, stat, inst;
 157
 158         is   = fas216_readb(info, REG_IS);
 159         stat = fas216_readb(info, REG_STAT);
 160         inst = fas216_readb(info, REG_INST);
 161
 162         printk("FAS216: CTCL=%02X CTCM=%02X CMD=%02X STAT=%02X"
 163                " INST=%02X IS=%02X CFIS=%02X",
 164                 fas216_readb(info, REG_CTCL),
 165                 fas216_readb(info, REG_CTCM),
 166                 fas216_readb(info, REG_CMD),  stat, inst, is,
 167                 fas216_readb(info, REG_CFIS));
 168         printk(" CNTL1=%02X CNTL2=%02X CNTL3=%02X CTCH=%02X\n",
 169                 fas216_readb(info, REG_CNTL1),
 170                 fas216_readb(info, REG_CNTL2),
 171                 fas216_readb(info, REG_CNTL3),
 172                 fas216_readb(info, REG_CTCH));
 173 }
 174
 175 static void print_SCp(struct scsi_pointer *SCp, const char *prefix, const char *suffix)
 176 {
 177         printk("%sptr %p this_residual 0x%x buffer %p buffers_residual 0x%x%s",
 178                 prefix, SCp->ptr, SCp->this_residual, SCp->buffer,
 179                 SCp->buffers_residual, suffix);
 180 }
 181
 182 #ifdef CHECK_STRUCTURE
 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 static void __fas216_checkmagic(FAS216_Info *info, const char *func)
 228 {
 229         int corruption = 0;
 230         if (info->magic_start != MAGIC) {
 231                 printk(KERN_CRIT "FAS216 Error: magic at start corrupted\n");
 232                 corruption++;
 233         }
 234         if (info->magic_end != MAGIC) {
 235                 printk(KERN_CRIT "FAS216 Error: magic at end corrupted\n");
 236                 corruption++;
 237         }
 238         if (corruption) {
 239                 fas216_dumpinfo(info);
 240                 panic("scsi memory space corrupted in %s", func);
 241         }
 242 }
 243 #define fas216_checkmagic(info) __fas216_checkmagic((info), __func__)
 244 #else
 245 #define fas216_checkmagic(info)
 246 #endif
 247
 248 static const char *fas216_bus_phase(int stat)
 249 {
 250         static const char *phases[] = {
 251                 "DATA OUT", "DATA IN",
 252                 "COMMAND", "STATUS",
 253                 "MISC OUT", "MISC IN",
 254                 "MESG OUT", "MESG IN"
 255         };
 256
 257         return phases[stat & STAT_BUSMASK];
 258 }
 259
 260 static const char *fas216_drv_phase(FAS216_Info *info)
 261 {
 262         static const char *phases[] = {
 263                 [PHASE_IDLE]            = "idle",
 264                 [PHASE_SELECTION]       = "selection",
 265                 [PHASE_COMMAND]         = "command",
 266                 [PHASE_DATAOUT]         = "data out",
 267                 [PHASE_DATAIN]          = "data in",
 268                 [PHASE_MSGIN]           = "message in",
 269                 [PHASE_MSGIN_DISCONNECT]= "disconnect",
 270                 [PHASE_MSGOUT_EXPECT]   = "expect message out",
 271                 [PHASE_MSGOUT]          = "message out",
 272                 [PHASE_STATUS]          = "status",
 273                 [PHASE_DONE]            = "done",
 274         };
 275
 276         if (info->scsi.phase < ARRAY_SIZE(phases) &&
 277             phases[info->scsi.phase])
 278                 return phases[info->scsi.phase];
 279         return "???";
 280 }
 281
 282 static char fas216_target(FAS216_Info *info)
 283 {
 284         if (info->SCpnt)
 285                 return '0' + info->SCpnt->device->id;
 286         else
 287                 return 'H';
 288 }
 289
 290 static void
 291 fas216_do_log(FAS216_Info *info, char target, char *fmt, va_list ap)
 292 {
 293         static char buf[1024];
 294
 295         vsnprintf(buf, sizeof(buf), fmt, ap);
 296         printk("scsi%d.%c: %s", info->host->host_no, target, buf);
 297 }
 298
 299 static void fas216_log_command(FAS216_Info *info, int level,
 300                                struct scsi_cmnd *SCpnt, char *fmt, ...)
 301 {
 302         va_list args;
 303
 304         if (level != 0 && !(level & level_mask))
 305                 return;
 306
 307         va_start(args, fmt);
 308         fas216_do_log(info, '0' + SCpnt->device->id, fmt, args);
 309         va_end(args);
 310
 311         printk(" CDB: ");
 312         __scsi_print_command(SCpnt->cmnd);
 313 }
 314
 315 static void
 316 fas216_log_target(FAS216_Info *info, int level, int target, char *fmt, ...)
 317 {
 318         va_list args;
 319
 320         if (level != 0 && !(level & level_mask))
 321                 return;
 322
 323         if (target < 0)
 324                 target = 'H';
 325         else
 326                 target += '0';
 327
 328         va_start(args, fmt);
 329         fas216_do_log(info, target, fmt, args);
 330         va_end(args);
 331
 332         printk("\n");
 333 }
 334
 335 static void fas216_log(FAS216_Info *info, int level, char *fmt, ...)
 336 {
 337         va_list args;
 338
 339         if (level != 0 && !(level & level_mask))
 340                 return;
 341
 342         va_start(args, fmt);
 343         fas216_do_log(info, fas216_target(info), fmt, args);
 344         va_end(args);
 345
 346         printk("\n");
 347 }
 348
 349 #define PH_SIZE 32
 350
 351 static struct { int stat, ssr, isr, ph; } ph_list[PH_SIZE];
 352 static int ph_ptr;
 353
 354 static void add_debug_list(int stat, int ssr, int isr, int ph)
 355 {
 356         ph_list[ph_ptr].stat = stat;
 357         ph_list[ph_ptr].ssr = ssr;
 358         ph_list[ph_ptr].isr = isr;
 359         ph_list[ph_ptr].ph = ph;
 360
 361         ph_ptr = (ph_ptr + 1) & (PH_SIZE-1);
 362 }
 363
 364 static struct { int command; void *from; } cmd_list[8];
 365 static int cmd_ptr;
 366
 367 static void fas216_cmd(FAS216_Info *info, unsigned int command)
 368 {
 369         cmd_list[cmd_ptr].command = command;
 370         cmd_list[cmd_ptr].from = __builtin_return_address(0);
 371
 372         cmd_ptr = (cmd_ptr + 1) & 7;
 373
 374         fas216_writeb(info, REG_CMD, command);
 375 }
 376
 377 static void print_debug_list(void)
 378 {
 379         int i;
 380
 381         i = ph_ptr;
 382
 383         printk(KERN_ERR "SCSI IRQ trail\n");
 384         do {
 385                 printk(" %02x:%02x:%02x:%1x",
 386                         ph_list[i].stat, ph_list[i].ssr,
 387                         ph_list[i].isr, ph_list[i].ph);
 388                 i = (i + 1) & (PH_SIZE - 1);
 389                 if (((i ^ ph_ptr) & 7) == 0)
 390                         printk("\n");
 391         } while (i != ph_ptr);
 392         if ((i ^ ph_ptr) & 7)
 393                 printk("\n");
 394
 395         i = cmd_ptr;
 396         printk(KERN_ERR "FAS216 commands: ");
 397         do {
 398                 printk("%02x:%p ", cmd_list[i].command, cmd_list[i].from);
 399                 i = (i + 1) & 7;
 400         } while (i != cmd_ptr);
 401         printk("\n");
 402 }
 403
 404 static void fas216_done(FAS216_Info *info, unsigned int result);
 405
 406 /**
 407  * fas216_get_last_msg - retrive last message from the list
 408  * @info: interface to search
 409  * @pos: current fifo position
 410  *
 411  * Retrieve a last message from the list, using position in fifo.
 412  */
 413 static inline unsigned short
 414 fas216_get_last_msg(FAS216_Info *info, int pos)
 415 {
 416         unsigned short packed_msg = NOP;
 417         struct message *msg;
 418         int msgnr = 0;
 419
 420         while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
 421                 if (pos >= msg->fifo)
 422                         break;
 423         }
 424
 425         if (msg) {
 426                 if (msg->msg[0] == EXTENDED_MESSAGE)
 427                         packed_msg = EXTENDED_MESSAGE | msg->msg[2] << 8;
 428                 else
 429                         packed_msg = msg->msg[0];
 430         }
 431
 432         fas216_log(info, LOG_MESSAGES,
 433                 "Message: %04x found at position %02x\n", packed_msg, pos);
 434
 435         return packed_msg;
 436 }
 437
 438 /**
 439  * fas216_syncperiod - calculate STP register value
 440  * @info: state structure for interface connected to device
 441  * @ns: period in ns (between subsequent bytes)
 442  *
 443  * Calculate value to be loaded into the STP register for a given period
 444  * in ns. Returns a value suitable for REG_STP.
 445  */
 446 static int fas216_syncperiod(FAS216_Info *info, int ns)
 447 {
 448         int value = (info->ifcfg.clockrate * ns) / 1000;
 449
 450         fas216_checkmagic(info);
 451
 452         if (value < 4)
 453                 value = 4;
 454         else if (value > 35)
 455                 value = 35;
 456
 457         return value & 31;
 458 }
 459
 460 /**
 461  * fas216_set_sync - setup FAS216 chip for specified transfer period.
 462  * @info: state structure for interface connected to device
 463  * @target: target
 464  *
 465  * Correctly setup FAS216 chip for specified transfer period.
 466  * Notes   : we need to switch the chip out of FASTSCSI mode if we have
 467  *           a transfer period >= 200ns - otherwise the chip will violate
 468  *           the SCSI timings.
 469  */
 470 static void fas216_set_sync(FAS216_Info *info, int target)
 471 {
 472         unsigned int cntl3;
 473
 474         fas216_writeb(info, REG_SOF, info->device[target].sof);
 475         fas216_writeb(info, REG_STP, info->device[target].stp);
 476
 477         cntl3 = info->scsi.cfg[2];
 478         if (info->device[target].period >= (200 / 4))
 479                 cntl3 = cntl3 & ~CNTL3_FASTSCSI;
 480
 481         fas216_writeb(info, REG_CNTL3, cntl3);
 482 }
 483
 484 /* Synchronous transfer support
 485  *
 486  * Note: The SCSI II r10 spec says (5.6.12):
 487  *
 488  *  (2)  Due to historical problems with early host adapters that could
 489  *  not accept an SDTR message, some targets may not initiate synchronous
 490  *  negotiation after a power cycle as required by this standard.  Host
 491  *  adapters that support synchronous mode may avoid the ensuing failure
 492  *  modes when the target is independently power cycled by initiating a
 493  *  synchronous negotiation on each REQUEST SENSE and INQUIRY command.
 494  *  This approach increases the SCSI bus overhead and is not recommended
 495  *  for new implementations.  The correct method is to respond to an
 496  *  SDTR message with a MESSAGE REJECT message if the either the
 497  *  initiator or target devices does not support synchronous transfers
 498  *  or does not want to negotiate for synchronous transfers at the time.
 499  *  Using the correct method assures compatibility with wide data
 500  *  transfers and future enhancements.
 501  *
 502  * We will always initiate a synchronous transfer negotiation request on
 503  * every INQUIRY or REQUEST SENSE message, unless the target itself has
 504  * at some point performed a synchronous transfer negotiation request, or
 505  * we have synchronous transfers disabled for this device.
 506  */
 507
 508 /**
 509  * fas216_handlesync - Handle a synchronous transfer message
 510  * @info: state structure for interface
 511  * @msg: message from target
 512  *
 513  * Handle a synchronous transfer message from the target
 514  */
 515 static void fas216_handlesync(FAS216_Info *info, char *msg)
 516 {
 517         struct fas216_device *dev = &info->device[info->SCpnt->device->id];
 518         enum { sync, async, none, reject } res = none;
 519
 520 #ifdef SCSI2_SYNC
 521         switch (msg[0]) {
 522         case MESSAGE_REJECT:
 523                 /* Synchronous transfer request failed.
 524                  * Note: SCSI II r10:
 525                  *
 526                  *  SCSI devices that are capable of synchronous
 527                  *  data transfers shall not respond to an SDTR
 528                  *  message with a MESSAGE REJECT message.
 529                  *
 530                  * Hence, if we get this condition, we disable
 531                  * negotiation for this device.
 532                  */
 533                 if (dev->sync_state == neg_inprogress) {
 534                         dev->sync_state = neg_invalid;
 535                         res = async;
 536                 }
 537                 break;
 538
 539         case EXTENDED_MESSAGE:
 540                 switch (dev->sync_state) {
 541                 /* We don't accept synchronous transfer requests.
 542                  * Respond with a MESSAGE_REJECT to prevent a
 543                  * synchronous transfer agreement from being reached.
 544                  */
 545                 case neg_invalid:
 546                         res = reject;
 547                         break;
 548
 549                 /* We were not negotiating a synchronous transfer,
 550                  * but the device sent us a negotiation request.
 551                  * Honour the request by sending back a SDTR
 552                  * message containing our capability, limited by
 553                  * the targets capability.
 554                  */
 555                 default:
 556                         fas216_cmd(info, CMD_SETATN);
 557                         if (msg[4] > info->ifcfg.sync_max_depth)
 558                                 msg[4] = info->ifcfg.sync_max_depth;
 559                         if (msg[3] < 1000 / info->ifcfg.clockrate)
 560                                 msg[3] = 1000 / info->ifcfg.clockrate;
 561
 562                         msgqueue_flush(&info->scsi.msgs);
 563                         msgqueue_addmsg(&info->scsi.msgs, 5,
 564                                         EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
 565                                         msg[3], msg[4]);
 566                         info->scsi.phase = PHASE_MSGOUT_EXPECT;
 567
 568                         /* This is wrong.  The agreement is not in effect
 569                          * until this message is accepted by the device
 570                          */
 571                         dev->sync_state = neg_targcomplete;
 572                         res = sync;
 573                         break;
 574
 575                 /* We initiated the synchronous transfer negotiation,
 576                  * and have successfully received a response from the
 577                  * target.  The synchronous transfer agreement has been
 578                  * reached.  Note: if the values returned are out of our
 579                  * bounds, we must reject the message.
 580                  */
 581                 case neg_inprogress:
 582                         res = reject;
 583                         if (msg[4] <= info->ifcfg.sync_max_depth &&
 584                             msg[3] >= 1000 / info->ifcfg.clockrate) {
 585                                 dev->sync_state = neg_complete;
 586                                 res = sync;
 587                         }
 588                         break;
 589                 }
 590         }
 591 #else
 592         res = reject;
 593 #endif
 594
 595         switch (res) {
 596         case sync:
 597                 dev->period = msg[3];
 598                 dev->sof    = msg[4];
 599                 dev->stp    = fas216_syncperiod(info, msg[3] * 4);
 600                 fas216_set_sync(info, info->SCpnt->device->id);
 601                 break;
 602
 603         case reject:
 604                 fas216_cmd(info, CMD_SETATN);
 605                 msgqueue_flush(&info->scsi.msgs);
 606                 msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
 607                 info->scsi.phase = PHASE_MSGOUT_EXPECT;
 608
 609         case async:
 610                 dev->period = info->ifcfg.asyncperiod / 4;
 611                 dev->sof    = 0;
 612                 dev->stp    = info->scsi.async_stp;
 613                 fas216_set_sync(info, info->SCpnt->device->id);
 614                 break;
 615
 616         case none:
 617                 break;
 618         }
 619 }
 620
 621 /**
 622  * fas216_updateptrs - update data pointers after transfer suspended/paused
 623  * @info: interface's local pointer to update
 624  * @bytes_transferred: number of bytes transferred
 625  *
 626  * Update data pointers after transfer suspended/paused
 627  */
 628 static void fas216_updateptrs(FAS216_Info *info, int bytes_transferred)
 629 {
 630         struct scsi_pointer *SCp = &info->scsi.SCp;
 631
 632         fas216_checkmagic(info);
 633
 634         BUG_ON(bytes_transferred < 0);
 635
 636         SCp->phase -= bytes_transferred;
 637
 638         while (bytes_transferred != 0) {
 639                 if (SCp->this_residual > bytes_transferred)
 640                         break;
 641                 /*
 642                  * We have used up this buffer.  Move on to the
 643                  * next buffer.
 644                  */
 645                 bytes_transferred -= SCp->this_residual;
 646                 if (!next_SCp(SCp) && bytes_transferred) {
 647                         printk(KERN_WARNING "scsi%d.%c: out of buffers\n",
 648                                 info->host->host_no, '0' + info->SCpnt->device->id);
 649                         return;
 650                 }
 651         }
 652
 653         SCp->this_residual -= bytes_transferred;
 654         if (SCp->this_residual)
 655                 SCp->ptr += bytes_transferred;
 656         else
 657                 SCp->ptr = NULL;
 658 }
 659
 660 /**
 661  * fas216_pio - transfer data off of/on to card using programmed IO
 662  * @info: interface to transfer data to/from
 663  * @direction: direction to transfer data (DMA_OUT/DMA_IN)
 664  *
 665  * Transfer data off of/on to card using programmed IO.
 666  * Notes: this is incredibly slow.
 667  */
 668 static void fas216_pio(FAS216_Info *info, fasdmadir_t direction)
 669 {
 670         struct scsi_pointer *SCp = &info->scsi.SCp;
 671
 672         fas216_checkmagic(info);
 673
 674         if (direction == DMA_OUT)
 675                 fas216_writeb(info, REG_FF, get_next_SCp_byte(SCp));
 676         else
 677                 put_next_SCp_byte(SCp, fas216_readb(info, REG_FF));
 678
 679         if (SCp->this_residual == 0)
 680                 next_SCp(SCp);
 681 }
 682
 683 static void fas216_set_stc(FAS216_Info *info, unsigned int length)
 684 {
 685         fas216_writeb(info, REG_STCL, length);
 686         fas216_writeb(info, REG_STCM, length >> 8);
 687         fas216_writeb(info, REG_STCH, length >> 16);
 688 }
 689
 690 static unsigned int fas216_get_ctc(FAS216_Info *info)
 691 {
 692         return fas216_readb(info, REG_CTCL) +
 693                (fas216_readb(info, REG_CTCM) << 8) +
 694                (fas216_readb(info, REG_CTCH) << 16);
 695 }
 696
 697 /**
 698  * fas216_cleanuptransfer - clean up after a transfer has completed.
 699  * @info: interface to clean up
 700  *
 701  * Update the data pointers according to the number of bytes transferred
 702  * on the SCSI bus.
 703  */
 704 static void fas216_cleanuptransfer(FAS216_Info *info)
 705 {
 706         unsigned long total, residual, fifo;
 707         fasdmatype_t dmatype = info->dma.transfer_type;
 708
 709         info->dma.transfer_type = fasdma_none;
 710
 711         /*
 712          * PIO transfers do not need to be cleaned up.
 713          */
 714         if (dmatype == fasdma_pio || dmatype == fasdma_none)
 715                 return;
 716
 717         if (dmatype == fasdma_real_all)
 718                 total = info->scsi.SCp.phase;
 719         else
 720                 total = info->scsi.SCp.this_residual;
 721
 722         residual = fas216_get_ctc(info);
 723
 724         fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
 725
 726         fas216_log(info, LOG_BUFFER, "cleaning up from previous "
 727                    "transfer: length 0x%06x, residual 0x%x, fifo %d",
 728                    total, residual, fifo);
 729
 730         /*
 731          * If we were performing Data-Out, the transfer counter
 732          * counts down each time a byte is transferred by the
 733          * host to the FIFO.  This means we must include the
 734          * bytes left in the FIFO from the transfer counter.
 735          */
 736         if (info->scsi.phase == PHASE_DATAOUT)
 737                 residual += fifo;
 738
 739         fas216_updateptrs(info, total - residual);
 740 }
 741
 742 /**
 743  * fas216_transfer - Perform a DMA/PIO transfer off of/on to card
 744  * @info: interface from which device disconnected from
 745  *
 746  * Start a DMA/PIO transfer off of/on to card
 747  */
 748 static void fas216_transfer(FAS216_Info *info)
 749 {
 750         fasdmadir_t direction;
 751         fasdmatype_t dmatype;
 752
 753         fas216_log(info, LOG_BUFFER,
 754                    "starttransfer: buffer %p length 0x%06x reqlen 0x%06x",
 755                    info->scsi.SCp.ptr, info->scsi.SCp.this_residual,
 756                    info->scsi.SCp.phase);
 757
 758         if (!info->scsi.SCp.ptr) {
 759                 fas216_log(info, LOG_ERROR, "null buffer passed to "
 760                            "fas216_starttransfer");
 761                 print_SCp(&info->scsi.SCp, "SCp: ", "\n");
 762                 print_SCp(&info->SCpnt->SCp, "Cmnd SCp: ", "\n");
 763                 return;
 764         }
 765
 766         /*
 767          * If we have a synchronous transfer agreement in effect, we must
 768          * use DMA mode.  If we are using asynchronous transfers, we may
 769          * use DMA mode or PIO mode.
 770          */
 771         if (info->device[info->SCpnt->device->id].sof)
 772                 dmatype = fasdma_real_all;
 773         else
 774                 dmatype = fasdma_pio;
 775
 776         if (info->scsi.phase == PHASE_DATAOUT)
 777                 direction = DMA_OUT;
 778         else
 779                 direction = DMA_IN;
 780
 781         if (info->dma.setup)
 782                 dmatype = info->dma.setup(info->host, &info->scsi.SCp,
 783                                           direction, dmatype);
 784         info->dma.transfer_type = dmatype;
 785
 786         if (dmatype == fasdma_real_all)
 787                 fas216_set_stc(info, info->scsi.SCp.phase);
 788         else
 789                 fas216_set_stc(info, info->scsi.SCp.this_residual);
 790
 791         switch (dmatype) {
 792         case fasdma_pio:
 793                 fas216_log(info, LOG_BUFFER, "PIO transfer");
 794                 fas216_writeb(info, REG_SOF, 0);
 795                 fas216_writeb(info, REG_STP, info->scsi.async_stp);
 796                 fas216_cmd(info, CMD_TRANSFERINFO);
 797                 fas216_pio(info, direction);
 798                 break;
 799
 800         case fasdma_pseudo:
 801                 fas216_log(info, LOG_BUFFER, "pseudo transfer");
 802                 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
 803                 info->dma.pseudo(info->host, &info->scsi.SCp,
 804                                  direction, info->SCpnt->transfersize);
 805                 break;
 806
 807         case fasdma_real_block:
 808                 fas216_log(info, LOG_BUFFER, "block dma transfer");
 809                 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
 810                 break;
 811
 812         case fasdma_real_all:
 813                 fas216_log(info, LOG_BUFFER, "total dma transfer");
 814                 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
 815                 break;
 816
 817         default:
 818                 fas216_log(info, LOG_BUFFER | LOG_ERROR,
 819                            "invalid FAS216 DMA type");
 820                 break;
 821         }
 822 }
 823
 824 /**
 825  * fas216_stoptransfer - Stop a DMA transfer onto / off of the card
 826  * @info: interface from which device disconnected from
 827  *
 828  * Called when we switch away from DATA IN or DATA OUT phases.
 829  */
 830 static void fas216_stoptransfer(FAS216_Info *info)
 831 {
 832         fas216_checkmagic(info);
 833
 834         if (info->dma.transfer_type == fasdma_real_all ||
 835             info->dma.transfer_type == fasdma_real_block)
 836                 info->dma.stop(info->host, &info->scsi.SCp);
 837
 838         fas216_cleanuptransfer(info);
 839
 840         if (info->scsi.phase == PHASE_DATAIN) {
 841                 unsigned int fifo;
 842
 843                 /*
 844                  * If we were performing Data-In, then the FIFO counter
 845                  * contains the number of bytes not transferred via DMA
 846                  * from the on-board FIFO.  Read them manually.
 847                  */
 848                 fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
 849                 while (fifo && info->scsi.SCp.ptr) {
 850                         *info->scsi.SCp.ptr = fas216_readb(info, REG_FF);
 851                         fas216_updateptrs(info, 1);
 852                         fifo--;
 853                 }
 854         } else {
 855                 /*
 856                  * After a Data-Out phase, there may be unsent
 857                  * bytes left in the FIFO.  Flush them out.
 858                  */
 859                 fas216_cmd(info, CMD_FLUSHFIFO);
 860         }
 861 }
 862
 863 static void fas216_aborttransfer(FAS216_Info *info)
 864 {
 865         fas216_checkmagic(info);
 866
 867         if (info->dma.transfer_type == fasdma_real_all ||
 868             info->dma.transfer_type == fasdma_real_block)
 869                 info->dma.stop(info->host, &info->scsi.SCp);
 870
 871         info->dma.transfer_type = fasdma_none;
 872         fas216_cmd(info, CMD_FLUSHFIFO);
 873 }
 874
 875 static void fas216_kick(FAS216_Info *info);
 876
 877 /**
 878  * fas216_disconnected_intr - handle device disconnection
 879  * @info: interface from which device disconnected from
 880  *
 881  * Handle device disconnection
 882  */
 883 static void fas216_disconnect_intr(FAS216_Info *info)
 884 {
 885         unsigned long flags;
 886
 887         fas216_checkmagic(info);
 888
 889         fas216_log(info, LOG_CONNECT, "disconnect phase=%02x",
 890                    info->scsi.phase);
 891
 892         msgqueue_flush(&info->scsi.msgs);
 893
 894         switch (info->scsi.phase) {
 895         case PHASE_SELECTION:                   /* while selecting - no target          */
 896         case PHASE_SELSTEPS:
 897                 fas216_done(info, DID_NO_CONNECT);
 898                 break;
 899
 900         case PHASE_MSGIN_DISCONNECT:            /* message in - disconnecting           */
 901                 info->scsi.disconnectable = 1;
 902                 info->scsi.phase = PHASE_IDLE;
 903                 info->stats.disconnects += 1;
 904                 spin_lock_irqsave(&info->host_lock, flags);
 905                 if (info->scsi.phase == PHASE_IDLE)
 906                         fas216_kick(info);
 907                 spin_unlock_irqrestore(&info->host_lock, flags);
 908                 break;
 909
 910         case PHASE_DONE:                        /* at end of command - complete         */
 911                 fas216_done(info, DID_OK);
 912                 break;
 913
 914         case PHASE_MSGOUT:                      /* message out - possible ABORT message */
 915                 if (fas216_get_last_msg(info, info->scsi.msgin_fifo) == ABORT) {
 916                         info->scsi.aborting = 0;
 917                         fas216_done(info, DID_ABORT);
 918                         break;
 919                 }
 920
 921         default:                                /* huh?                                 */
 922                 printk(KERN_ERR "scsi%d.%c: unexpected disconnect in phase %s\n",
 923                         info->host->host_no, fas216_target(info), fas216_drv_phase(info));
 924                 print_debug_list();
 925                 fas216_stoptransfer(info);
 926                 fas216_done(info, DID_ERROR);
 927                 break;
 928         }
 929 }
 930
 931 /**
 932  * fas216_reselected_intr - start reconnection of a device
 933  * @info: interface which was reselected
 934  *
 935  * Start reconnection of a device
 936  */
 937 static void
 938 fas216_reselected_intr(FAS216_Info *info)
 939 {
 940         unsigned int cfis, i;
 941         unsigned char msg[4];
 942         unsigned char target, lun, tag;
 943
 944         fas216_checkmagic(info);
 945
 946         WARN_ON(info->scsi.phase == PHASE_SELECTION ||
 947                 info->scsi.phase == PHASE_SELSTEPS);
 948
 949         cfis = fas216_readb(info, REG_CFIS);
 950
 951         fas216_log(info, LOG_CONNECT, "reconnect phase=%02x cfis=%02x",
 952                    info->scsi.phase, cfis);
 953
 954         cfis &= CFIS_CF;
 955
 956         if (cfis < 2 || cfis > 4) {
 957                 printk(KERN_ERR "scsi%d.H: incorrect number of bytes after reselect\n",
 958                         info->host->host_no);
 959                 goto bad_message;
 960         }
 961
 962         for (i = 0; i < cfis; i++)
 963                 msg[i] = fas216_readb(info, REG_FF);
 964
 965         if (!(msg[0] & (1 << info->host->this_id)) ||
 966             !(msg[1] & 0x80))
 967                 goto initiator_error;
 968
 969         target = msg[0] & ~(1 << info->host->this_id);
 970         target = ffs(target) - 1;
 971         lun = msg[1] & 7;
 972         tag = 0;
 973
 974         if (cfis >= 3) {
 975                 if (msg[2] != SIMPLE_QUEUE_TAG)
 976                         goto initiator_error;
 977
 978                 tag = msg[3];
 979         }
 980
 981         /* set up for synchronous transfers */
 982         fas216_writeb(info, REG_SDID, target);
 983         fas216_set_sync(info, target);
 984         msgqueue_flush(&info->scsi.msgs);
 985
 986         fas216_log(info, LOG_CONNECT, "Reconnected: target %1x lun %1x tag %02x",
 987                    target, lun, tag);
 988
 989         if (info->scsi.disconnectable && info->SCpnt) {
 990                 info->scsi.disconnectable = 0;
 991                 if (info->SCpnt->device->id  == target &&
 992                     info->SCpnt->device->lun == lun &&
 993                     info->SCpnt->tag         == tag) {
 994                         fas216_log(info, LOG_CONNECT, "reconnected previously executing command");
 995                 } else {
 996                         queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
 997                         fas216_log(info, LOG_CONNECT, "had to move command to disconnected queue");
 998                         info->SCpnt = NULL;
 999                 }
1000         }
1001         if (!info->SCpnt) {
1002                 info->SCpnt = queue_remove_tgtluntag(&info->queues.disconnected,
1003                                         target, lun, tag);
1004                 fas216_log(info, LOG_CONNECT, "had to get command");
1005         }
1006
1007         if (info->SCpnt) {
1008                 /*
1009                  * Restore data pointer from SAVED data pointer
1010                  */
1011                 info->scsi.SCp = info->SCpnt->SCp;
1012
1013                 fas216_log(info, LOG_CONNECT, "data pointers: [%p, %X]",
1014                         info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1015                 info->scsi.phase = PHASE_MSGIN;
1016         } else {
1017                 /*
1018                  * Our command structure not found - abort the
1019                  * command on the target.  Since we have no
1020                  * record of this command, we can't send
1021                  * an INITIATOR DETECTED ERROR message.
1022                  */
1023                 fas216_cmd(info, CMD_SETATN);
1024
1025 #if 0
1026                 if (tag)
1027                         msgqueue_addmsg(&info->scsi.msgs, 2, ABORT_TAG, tag);
1028                 else
1029 #endif
1030                         msgqueue_addmsg(&info->scsi.msgs, 1, ABORT);
1031                 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1032                 info->scsi.aborting = 1;
1033         }
1034
1035         fas216_cmd(info, CMD_MSGACCEPTED);
1036         return;
1037
1038  initiator_error:
1039         printk(KERN_ERR "scsi%d.H: error during reselection: bytes",
1040                 info->host->host_no);
1041         for (i = 0; i < cfis; i++)
1042                 printk(" %02x", msg[i]);
1043         printk("\n");
1044  bad_message:
1045         fas216_cmd(info, CMD_SETATN);
1046         msgqueue_flush(&info->scsi.msgs);
1047         msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1048         info->scsi.phase = PHASE_MSGOUT_EXPECT;
1049         fas216_cmd(info, CMD_MSGACCEPTED);
1050 }
1051
1052 static void fas216_parse_message(FAS216_Info *info, unsigned char *message, int msglen)
1053 {
1054         int i;
1055
1056         switch (message[0]) {
1057         case COMMAND_COMPLETE:
1058                 if (msglen != 1)
1059                         goto unrecognised;
1060
1061                 printk(KERN_ERR "scsi%d.%c: command complete with no "
1062                         "status in MESSAGE_IN?\n",
1063                         info->host->host_no, fas216_target(info));
1064                 break;
1065
1066         case SAVE_POINTERS:
1067                 if (msglen != 1)
1068                         goto unrecognised;
1069
1070                 /*
1071                  * Save current data pointer to SAVED data pointer
1072                  * SCSI II standard says that we must not acknowledge
1073                  * this until we have really saved pointers.
1074                  * NOTE: we DO NOT save the command nor status pointers
1075                  * as required by the SCSI II standard.  These always
1076                  * point to the start of their respective areas.
1077                  */
1078                 info->SCpnt->SCp = info->scsi.SCp;
1079                 info->SCpnt->SCp.sent_command = 0;
1080                 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
1081                         "save data pointers: [%p, %X]",
1082                         info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1083                 break;
1084
1085         case RESTORE_POINTERS:
1086                 if (msglen != 1)
1087                         goto unrecognised;
1088
1089                 /*
1090                  * Restore current data pointer from SAVED data pointer
1091                  */
1092                 info->scsi.SCp = info->SCpnt->SCp;
1093                 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
1094                         "restore data pointers: [%p, 0x%x]",
1095                         info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1096                 break;
1097
1098         case DISCONNECT:
1099                 if (msglen != 1)
1100                         goto unrecognised;
1101
1102                 info->scsi.phase = PHASE_MSGIN_DISCONNECT;
1103                 break;
1104
1105         case MESSAGE_REJECT:
1106                 if (msglen != 1)
1107                         goto unrecognised;
1108
1109                 switch (fas216_get_last_msg(info, info->scsi.msgin_fifo)) {
1110                 case EXTENDED_MESSAGE | EXTENDED_SDTR << 8:
1111                         fas216_handlesync(info, message);
1112                         break;
1113
1114                 default:
1115                         fas216_log(info, 0, "reject, last message 0x%04x",
1116                                 fas216_get_last_msg(info, info->scsi.msgin_fifo));
1117                 }
1118                 break;
1119
1120         case NOP:
1121                 break;
1122
1123         case EXTENDED_MESSAGE:
1124                 if (msglen < 3)
1125                         goto unrecognised;
1126
1127                 switch (message[2]) {
1128                 case EXTENDED_SDTR:     /* Sync transfer negotiation request/reply */
1129                         fas216_handlesync(info, message);
1130                         break;
1131
1132                 default:
1133                         goto unrecognised;
1134                 }
1135                 break;
1136
1137         default:
1138                 goto unrecognised;
1139         }
1140         return;
1141
1142 unrecognised:
1143         fas216_log(info, 0, "unrecognised message, rejecting");
1144         printk("scsi%d.%c: message was", info->host->host_no, fas216_target(info));
1145         for (i = 0; i < msglen; i++)
1146                 printk("%s%02X", i & 31 ? " " : "\n  ", message[i]);
1147         printk("\n");
1148
1149         /*
1150          * Something strange seems to be happening here -
1151          * I can't use SETATN since the chip gives me an
1152          * invalid command interrupt when I do.  Weird.
1153          */
1154 fas216_cmd(info, CMD_NOP);
1155 fas216_dumpstate(info);
1156         fas216_cmd(info, CMD_SETATN);
1157         msgqueue_flush(&info->scsi.msgs);
1158         msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
1159         info->scsi.phase = PHASE_MSGOUT_EXPECT;
1160 fas216_dumpstate(info);
1161 }
1162
1163 static int fas216_wait_cmd(FAS216_Info *info, int cmd)
1164 {
1165         int tout;
1166         int stat;
1167
1168         fas216_cmd(info, cmd);
1169
1170         for (tout = 1000; tout; tout -= 1) {
1171                 stat = fas216_readb(info, REG_STAT);
1172                 if (stat & (STAT_INT|STAT_PARITYERROR))
1173                         break;
1174                 udelay(1);
1175         }
1176
1177         return stat;
1178 }
1179
1180 static int fas216_get_msg_byte(FAS216_Info *info)
1181 {
1182         unsigned int stat = fas216_wait_cmd(info, CMD_MSGACCEPTED);
1183
1184         if ((stat & STAT_INT) == 0)
1185                 goto timedout;
1186
1187         if ((stat & STAT_BUSMASK) != STAT_MESGIN)
1188                 goto unexpected_phase_change;
1189
1190         fas216_readb(info, REG_INST);
1191
1192         stat = fas216_wait_cmd(info, CMD_TRANSFERINFO);
1193
1194         if ((stat & STAT_INT) == 0)
1195                 goto timedout;
1196
1197         if (stat & STAT_PARITYERROR)
1198                 goto parity_error;
1199
1200         if ((stat & STAT_BUSMASK) != STAT_MESGIN)
1201                 goto unexpected_phase_change;
1202
1203         fas216_readb(info, REG_INST);
1204
1205         return fas216_readb(info, REG_FF);
1206
1207 timedout:
1208         fas216_log(info, LOG_ERROR, "timed out waiting for message byte");
1209         return -1;
1210
1211 unexpected_phase_change:
1212         fas216_log(info, LOG_ERROR, "unexpected phase change: status = %02x", stat);
1213         return -2;
1214
1215 parity_error:
1216         fas216_log(info, LOG_ERROR, "parity error during message in phase");
1217         return -3;
1218 }
1219
1220 /**
1221  * fas216_message - handle a function done interrupt from FAS216 chip
1222  * @info: interface which caused function done interrupt
1223  *
1224  * Handle a function done interrupt from FAS216 chip
1225  */
1226 static void fas216_message(FAS216_Info *info)
1227 {
1228         unsigned char *message = info->scsi.message;
1229         unsigned int msglen = 1;
1230         int msgbyte = 0;
1231
1232         fas216_checkmagic(info);
1233
1234         message[0] = fas216_readb(info, REG_FF);
1235
1236         if (message[0] == EXTENDED_MESSAGE) {
1237                 msgbyte = fas216_get_msg_byte(info);
1238
1239                 if (msgbyte >= 0) {
1240                         message[1] = msgbyte;
1241
1242                         for (msglen = 2; msglen < message[1] + 2; msglen++) {
1243                                 msgbyte = fas216_get_msg_byte(info);
1244
1245                                 if (msgbyte >= 0)
1246                                         message[msglen] = msgbyte;
1247                                 else
1248                                         break;
1249                         }
1250                 }
1251         }
1252
1253         if (msgbyte == -3)
1254                 goto parity_error;
1255
1256 #ifdef DEBUG_MESSAGES
1257         {
1258                 int i;
1259
1260                 printk("scsi%d.%c: message in: ",
1261                         info->host->host_no, fas216_target(info));
1262                 for (i = 0; i < msglen; i++)
1263                         printk("%02X ", message[i]);
1264                 printk("\n");
1265         }
1266 #endif
1267
1268         fas216_parse_message(info, message, msglen);
1269         fas216_cmd(info, CMD_MSGACCEPTED);
1270         return;
1271
1272 parity_error:
1273         fas216_cmd(info, CMD_SETATN);
1274         msgqueue_flush(&info->scsi.msgs);
1275         msgqueue_addmsg(&info->scsi.msgs, 1, MSG_PARITY_ERROR);
1276         info->scsi.phase = PHASE_MSGOUT_EXPECT;
1277         fas216_cmd(info, CMD_MSGACCEPTED);
1278         return;
1279 }
1280
1281 /**
1282  * fas216_send_command - send command after all message bytes have been sent
1283  * @info: interface which caused bus service
1284  *
1285  * Send a command to a target after all message bytes have been sent
1286  */
1287 static void fas216_send_command(FAS216_Info *info)
1288 {
1289         int i;
1290
1291         fas216_checkmagic(info);
1292
1293         fas216_cmd(info, CMD_NOP|CMD_WITHDMA);
1294         fas216_cmd(info, CMD_FLUSHFIFO);
1295
1296         /* load command */
1297         for (i = info->scsi.SCp.sent_command; i < info->SCpnt->cmd_len; i++)
1298                 fas216_writeb(info, REG_FF, info->SCpnt->cmnd[i]);
1299
1300         fas216_cmd(info, CMD_TRANSFERINFO);
1301
1302         info->scsi.phase = PHASE_COMMAND;
1303 }
1304
1305 /**
1306  * fas216_send_messageout - handle bus service to send a message
1307  * @info: interface which caused bus service
1308  *
1309  * Handle bus service to send a message.
1310  * Note: We do not allow the device to change the data direction!
1311  */
1312 static void fas216_send_messageout(FAS216_Info *info, int start)
1313 {
1314         unsigned int tot_msglen = msgqueue_msglength(&info->scsi.msgs);
1315
1316         fas216_checkmagic(info);
1317
1318         fas216_cmd(info, CMD_FLUSHFIFO);
1319
1320         if (tot_msglen) {
1321                 struct message *msg;
1322                 int msgnr = 0;
1323
1324                 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1325                         int i;
1326
1327                         for (i = start; i < msg->length; i++)
1328                                 fas216_writeb(info, REG_FF, msg->msg[i]);
1329
1330                         msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
1331                         start = 0;
1332                 }
1333         } else
1334                 fas216_writeb(info, REG_FF, NOP);
1335
1336         fas216_cmd(info, CMD_TRANSFERINFO);
1337
1338         info->scsi.phase = PHASE_MSGOUT;
1339 }
1340
1341 /**
1342  * fas216_busservice_intr - handle bus service interrupt from FAS216 chip
1343  * @info: interface which caused bus service interrupt
1344  * @stat: Status register contents
1345  * @is: SCSI Status register contents
1346  *
1347  * Handle a bus service interrupt from FAS216 chip
1348  */
1349 static void fas216_busservice_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
1350 {
1351         fas216_checkmagic(info);
1352
1353         fas216_log(info, LOG_BUSSERVICE,
1354                    "bus service: stat=%02x is=%02x phase=%02x",
1355                    stat, is, info->scsi.phase);
1356
1357         switch (info->scsi.phase) {
1358         case PHASE_SELECTION:
1359                 if ((is & IS_BITS) != IS_MSGBYTESENT)
1360                         goto bad_is;
1361                 break;
1362
1363         case PHASE_SELSTEPS:
1364                 switch (is & IS_BITS) {
1365                 case IS_SELARB:
1366                 case IS_MSGBYTESENT:
1367                         goto bad_is;
1368
1369                 case IS_NOTCOMMAND:
1370                 case IS_EARLYPHASE:
1371                         if ((stat & STAT_BUSMASK) == STAT_MESGIN)
1372                                 break;
1373                         goto bad_is;
1374
1375                 case IS_COMPLETE:
1376                         break;
1377                 }
1378
1379         default:
1380                 break;
1381         }
1382
1383         fas216_cmd(info, CMD_NOP);
1384
1385 #define STATE(st,ph) ((ph) << 3 | (st))
1386         /* This table describes the legal SCSI state transitions,
1387          * as described by the SCSI II spec.
1388          */
1389         switch (STATE(stat & STAT_BUSMASK, info->scsi.phase)) {
1390         case STATE(STAT_DATAIN, PHASE_SELSTEPS):/* Sel w/ steps -> Data In      */
1391         case STATE(STAT_DATAIN, PHASE_MSGOUT):  /* Message Out  -> Data In      */
1392         case STATE(STAT_DATAIN, PHASE_COMMAND): /* Command      -> Data In      */
1393         case STATE(STAT_DATAIN, PHASE_MSGIN):   /* Message In   -> Data In      */
1394                 info->scsi.phase = PHASE_DATAIN;
1395                 fas216_transfer(info);
1396                 return;
1397
1398         case STATE(STAT_DATAIN, PHASE_DATAIN):  /* Data In      -> Data In      */
1399         case STATE(STAT_DATAOUT, PHASE_DATAOUT):/* Data Out     -> Data Out     */
1400                 fas216_cleanuptransfer(info);
1401                 fas216_transfer(info);
1402                 return;
1403
1404         case STATE(STAT_DATAOUT, PHASE_SELSTEPS):/* Sel w/ steps-> Data Out     */
1405         case STATE(STAT_DATAOUT, PHASE_MSGOUT): /* Message Out  -> Data Out     */
1406         case STATE(STAT_DATAOUT, PHASE_COMMAND):/* Command      -> Data Out     */
1407         case STATE(STAT_DATAOUT, PHASE_MSGIN):  /* Message In   -> Data Out     */
1408                 fas216_cmd(info, CMD_FLUSHFIFO);
1409                 info->scsi.phase = PHASE_DATAOUT;
1410                 fas216_transfer(info);
1411                 return;
1412
1413         case STATE(STAT_STATUS, PHASE_DATAOUT): /* Data Out     -> Status       */
1414         case STATE(STAT_STATUS, PHASE_DATAIN):  /* Data In      -> Status       */
1415                 fas216_stoptransfer(info);
1416         case STATE(STAT_STATUS, PHASE_SELSTEPS):/* Sel w/ steps -> Status       */
1417         case STATE(STAT_STATUS, PHASE_MSGOUT):  /* Message Out  -> Status       */
1418         case STATE(STAT_STATUS, PHASE_COMMAND): /* Command      -> Status       */
1419         case STATE(STAT_STATUS, PHASE_MSGIN):   /* Message In   -> Status       */
1420                 fas216_cmd(info, CMD_INITCMDCOMPLETE);
1421                 info->scsi.phase = PHASE_STATUS;
1422                 return;
1423
1424         case STATE(STAT_MESGIN, PHASE_DATAOUT): /* Data Out     -> Message In   */
1425         case STATE(STAT_MESGIN, PHASE_DATAIN):  /* Data In      -> Message In   */
1426                 fas216_stoptransfer(info);
1427         case STATE(STAT_MESGIN, PHASE_COMMAND): /* Command      -> Message In   */
1428         case STATE(STAT_MESGIN, PHASE_SELSTEPS):/* Sel w/ steps -> Message In   */
1429         case STATE(STAT_MESGIN, PHASE_MSGOUT):  /* Message Out  -> Message In   */
1430                 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
1431                 fas216_cmd(info, CMD_FLUSHFIFO);
1432                 fas216_cmd(info, CMD_TRANSFERINFO);
1433                 info->scsi.phase = PHASE_MSGIN;
1434                 return;
1435
1436         case STATE(STAT_MESGIN, PHASE_MSGIN):
1437                 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
1438                 fas216_cmd(info, CMD_TRANSFERINFO);
1439                 return;
1440
1441         case STATE(STAT_COMMAND, PHASE_MSGOUT): /* Message Out  -> Command      */
1442         case STATE(STAT_COMMAND, PHASE_MSGIN):  /* Message In   -> Command      */
1443                 fas216_send_command(info);
1444                 info->scsi.phase = PHASE_COMMAND;
1445                 return;
1446
1447
1448         /*
1449          * Selection    -> Message Out
1450          */
1451         case STATE(STAT_MESGOUT, PHASE_SELECTION):
1452                 fas216_send_messageout(info, 1);
1453                 return;
1454
1455         /*
1456          * Message Out  -> Message Out
1457          */
1458         case STATE(STAT_MESGOUT, PHASE_SELSTEPS):
1459         case STATE(STAT_MESGOUT, PHASE_MSGOUT):
1460                 /*
1461                  * If we get another message out phase, this usually
1462                  * means some parity error occurred.  Resend complete
1463                  * set of messages.  If we have more than one byte to
1464                  * send, we need to assert ATN again.
1465                  */
1466                 if (info->device[info->SCpnt->device->id].parity_check) {
1467                         /*
1468                          * We were testing... good, the device
1469                          * supports parity checking.
1470                          */
1471                         info->device[info->SCpnt->device->id].parity_check = 0;
1472                         info->device[info->SCpnt->device->id].parity_enabled = 1;
1473                         fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
1474                 }
1475
1476                 if (msgqueue_msglength(&info->scsi.msgs) > 1)
1477                         fas216_cmd(info, CMD_SETATN);
1478                 /*FALLTHROUGH*/
1479
1480         /*
1481          * Any          -> Message Out
1482          */
1483         case STATE(STAT_MESGOUT, PHASE_MSGOUT_EXPECT):
1484                 fas216_send_messageout(info, 0);
1485                 return;
1486
1487         /* Error recovery rules.
1488          *   These either attempt to abort or retry the operation.
1489          * TODO: we need more of these
1490          */
1491         case STATE(STAT_COMMAND, PHASE_COMMAND):/* Command      -> Command      */
1492                 /* error - we've sent out all the command bytes
1493                  * we have.
1494                  * NOTE: we need SAVE DATA POINTERS/RESTORE DATA POINTERS
1495                  * to include the command bytes sent for this to work
1496                  * correctly.
1497                  */
1498                 printk(KERN_ERR "scsi%d.%c: "
1499                         "target trying to receive more command bytes\n",
1500                         info->host->host_no, fas216_target(info));
1501                 fas216_cmd(info, CMD_SETATN);
1502                 fas216_set_stc(info, 15);
1503                 fas216_cmd(info, CMD_PADBYTES | CMD_WITHDMA);
1504                 msgqueue_flush(&info->scsi.msgs);
1505                 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1506                 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1507                 return;
1508         }
1509
1510         if (info->scsi.phase == PHASE_MSGIN_DISCONNECT) {
1511                 printk(KERN_ERR "scsi%d.%c: disconnect message received, but bus service %s?\n",
1512                         info->host->host_no, fas216_target(info),
1513                         fas216_bus_phase(stat));
1514                 msgqueue_flush(&info->scsi.msgs);
1515                 fas216_cmd(info, CMD_SETATN);
1516                 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1517                 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1518                 info->scsi.aborting = 1;
1519                 fas216_cmd(info, CMD_TRANSFERINFO);
1520                 return;
1521         }
1522         printk(KERN_ERR "scsi%d.%c: bus phase %s after %s?\n",
1523                 info->host->host_no, fas216_target(info),
1524                 fas216_bus_phase(stat),
1525                 fas216_drv_phase(info));
1526         print_debug_list();
1527         return;
1528
1529 bad_is:
1530         fas216_log(info, 0, "bus service at step %d?", is & IS_BITS);
1531         fas216_dumpstate(info);
1532         print_debug_list();
1533
1534         fas216_done(info, DID_ERROR);
1535 }
1536
1537 /**
1538  * fas216_funcdone_intr - handle a function done interrupt from FAS216 chip
1539  * @info: interface which caused function done interrupt
1540  * @stat: Status register contents
1541  * @is: SCSI Status register contents
1542  *
1543  * Handle a function done interrupt from FAS216 chip
1544  */
1545 static void fas216_funcdone_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
1546 {
1547         unsigned int fifo_len = fas216_readb(info, REG_CFIS) & CFIS_CF;
1548
1549         fas216_checkmagic(info);
1550
1551         fas216_log(info, LOG_FUNCTIONDONE,
1552                    "function done: stat=%02x is=%02x phase=%02x",
1553                    stat, is, info->scsi.phase);
1554
1555         switch (info->scsi.phase) {
1556         case PHASE_STATUS:                      /* status phase - read status and msg   */
1557                 if (fifo_len != 2) {
1558                         fas216_log(info, 0, "odd number of bytes in FIFO: %d", fifo_len);
1559                 }
1560                 /*
1561                  * Read status then message byte.
1562                  */
1563                 info->scsi.SCp.Status = fas216_readb(info, REG_FF);
1564                 info->scsi.SCp.Message = fas216_readb(info, REG_FF);
1565                 info->scsi.phase = PHASE_DONE;
1566                 fas216_cmd(info, CMD_MSGACCEPTED);
1567                 break;
1568
1569         case PHASE_IDLE:
1570         case PHASE_SELECTION:
1571         case PHASE_SELSTEPS:
1572                 break;
1573
1574         case PHASE_MSGIN:                       /* message in phase                     */
1575                 if ((stat & STAT_BUSMASK) == STAT_MESGIN) {
1576                         info->scsi.msgin_fifo = fifo_len;
1577                         fas216_message(info);
1578                         break;
1579                 }
1580
1581         default:
1582                 fas216_log(info, 0, "internal phase %s for function done?"
1583                         "  What do I do with this?",
1584                         fas216_target(info), fas216_drv_phase(info));
1585         }
1586 }
1587
1588 static void fas216_bus_reset(FAS216_Info *info)
1589 {
1590         neg_t sync_state;
1591         int i;
1592
1593         msgqueue_flush(&info->scsi.msgs);
1594
1595         sync_state = neg_invalid;
1596
1597 #ifdef SCSI2_SYNC
1598         if (info->ifcfg.capabilities & (FASCAP_DMA|FASCAP_PSEUDODMA))
1599                 sync_state = neg_wait;
1600 #endif
1601
1602         info->scsi.phase = PHASE_IDLE;
1603         info->SCpnt = NULL; /* bug! */
1604         memset(&info->scsi.SCp, 0, sizeof(info->scsi.SCp));
1605
1606         for (i = 0; i < 8; i++) {
1607                 info->device[i].disconnect_ok   = info->ifcfg.disconnect_ok;
1608                 info->device[i].sync_state      = sync_state;
1609                 info->device[i].period          = info->ifcfg.asyncperiod / 4;
1610                 info->device[i].stp             = info->scsi.async_stp;
1611                 info->device[i].sof             = 0;
1612                 info->device[i].wide_xfer       = 0;
1613         }
1614
1615         info->rst_bus_status = 1;
1616         wake_up(&info->eh_wait);
1617 }
1618
1619 /**
1620  * fas216_intr - handle interrupts to progress a command
1621  * @info: interface to service
1622  *
1623  * Handle interrupts from the interface to progress a command
1624  */
1625 irqreturn_t fas216_intr(FAS216_Info *info)
1626 {
1627         unsigned char inst, is, stat;
1628         int handled = IRQ_NONE;
1629
1630         fas216_checkmagic(info);
1631
1632         stat = fas216_readb(info, REG_STAT);
1633         is = fas216_readb(info, REG_IS);
1634         inst = fas216_readb(info, REG_INST);
1635
1636         add_debug_list(stat, is, inst, info->scsi.phase);
1637
1638         if (stat & STAT_INT) {
1639                 if (inst & INST_BUSRESET) {
1640                         fas216_log(info, 0, "bus reset detected");
1641                         fas216_bus_reset(info);
1642                         scsi_report_bus_reset(info->host, 0);
1643                 } else if (inst & INST_ILLEGALCMD) {
1644                         fas216_log(info, LOG_ERROR, "illegal command given\n");
1645                         fas216_dumpstate(info);
1646                         print_debug_list();
1647                 } else if (inst & INST_DISCONNECT)
1648                         fas216_disconnect_intr(info);
1649                 else if (inst & INST_RESELECTED)        /* reselected                   */
1650                         fas216_reselected_intr(info);
1651                 else if (inst & INST_BUSSERVICE)        /* bus service request          */
1652                         fas216_busservice_intr(info, stat, is);
1653                 else if (inst & INST_FUNCDONE)          /* function done                */
1654                         fas216_funcdone_intr(info, stat, is);
1655                 else
1656                         fas216_log(info, 0, "unknown interrupt received:"
1657                                 " phase %s inst %02X is %02X stat %02X",
1658                                 fas216_drv_phase(info), inst, is, stat);
1659                 handled = IRQ_HANDLED;
1660         }
1661         return handled;
1662 }
1663
1664 static void __fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1665 {
1666         int tot_msglen;
1667
1668         /* following what the ESP driver says */
1669         fas216_set_stc(info, 0);
1670         fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
1671
1672         /* flush FIFO */
1673         fas216_cmd(info, CMD_FLUSHFIFO);
1674
1675         /* load bus-id and timeout */
1676         fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
1677         fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
1678
1679         /* synchronous transfers */
1680         fas216_set_sync(info, SCpnt->device->id);
1681
1682         tot_msglen = msgqueue_msglength(&info->scsi.msgs);
1683
1684 #ifdef DEBUG_MESSAGES
1685         {
1686                 struct message *msg;
1687                 int msgnr = 0, i;
1688
1689                 printk("scsi%d.%c: message out: ",
1690                         info->host->host_no, '0' + SCpnt->device->id);
1691                 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1692                         printk("{ ");
1693                         for (i = 0; i < msg->length; i++)
1694                                 printk("%02x ", msg->msg[i]);
1695                         printk("} ");
1696                 }
1697                 printk("\n");
1698         }
1699 #endif
1700
1701         if (tot_msglen == 1 || tot_msglen == 3) {
1702                 /*
1703                  * We have an easy message length to send...
1704                  */
1705                 struct message *msg;
1706                 int msgnr = 0, i;
1707
1708                 info->scsi.phase = PHASE_SELSTEPS;
1709
1710                 /* load message bytes */
1711                 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1712                         for (i = 0; i < msg->length; i++)
1713                                 fas216_writeb(info, REG_FF, msg->msg[i]);
1714                         msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
1715                 }
1716
1717                 /* load command */
1718                 for (i = 0; i < SCpnt->cmd_len; i++)
1719                         fas216_writeb(info, REG_FF, SCpnt->cmnd[i]);
1720
1721                 if (tot_msglen == 1)
1722                         fas216_cmd(info, CMD_SELECTATN);
1723                 else
1724                         fas216_cmd(info, CMD_SELECTATN3);
1725         } else {
1726                 /*
1727                  * We have an unusual number of message bytes to send.
1728                  *  Load first byte into fifo, and issue SELECT with ATN and
1729                  *  stop steps.
1730                  */
1731                 struct message *msg = msgqueue_getmsg(&info->scsi.msgs, 0);
1732
1733                 fas216_writeb(info, REG_FF, msg->msg[0]);
1734                 msg->fifo = 1;
1735
1736                 fas216_cmd(info, CMD_SELECTATNSTOP);
1737         }
1738 }
1739
1740 /*
1741  * Decide whether we need to perform a parity test on this device.
1742  * Can also be used to force parity error conditions during initial
1743  * information transfer phase (message out) for test purposes.
1744  */
1745 static int parity_test(FAS216_Info *info, int target)
1746 {
1747 #if 0
1748         if (target == 3) {
1749                 info->device[target].parity_check = 0;
1750                 return 1;
1751         }
1752 #endif
1753         return info->device[target].parity_check;
1754 }
1755
1756 static void fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1757 {
1758         int disconnect_ok;
1759
1760         /*
1761          * claim host busy
1762          */
1763         info->scsi.phase = PHASE_SELECTION;
1764         info->scsi.SCp = SCpnt->SCp;
1765         info->SCpnt = SCpnt;
1766         info->dma.transfer_type = fasdma_none;
1767
1768         if (parity_test(info, SCpnt->device->id))
1769                 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_PTE);
1770         else
1771                 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
1772
1773         /*
1774          * Don't allow request sense commands to disconnect.
1775          */
1776         disconnect_ok = SCpnt->cmnd[0] != REQUEST_SENSE &&
1777                         info->device[SCpnt->device->id].disconnect_ok;
1778
1779         /*
1780          * build outgoing message bytes
1781          */
1782         msgqueue_flush(&info->scsi.msgs);
1783         msgqueue_addmsg(&info->scsi.msgs, 1, IDENTIFY(disconnect_ok, SCpnt->device->lun));
1784
1785         /*
1786          * add tag message if required
1787          */
1788         if (SCpnt->tag)
1789                 msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG, SCpnt->tag);
1790
1791         do {
1792 #ifdef SCSI2_SYNC
1793                 if ((info->device[SCpnt->device->id].sync_state == neg_wait ||
1794                      info->device[SCpnt->device->id].sync_state == neg_complete) &&
1795                     (SCpnt->cmnd[0] == REQUEST_SENSE ||
1796                      SCpnt->cmnd[0] == INQUIRY)) {
1797                         info->device[SCpnt->device->id].sync_state = neg_inprogress;
1798                         msgqueue_addmsg(&info->scsi.msgs, 5,
1799                                         EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
1800                                         1000 / info->ifcfg.clockrate,
1801                                         info->ifcfg.sync_max_depth);
1802                         break;
1803                 }
1804 #endif
1805         } while (0);
1806
1807         __fas216_start_command(info, SCpnt);
1808 }
1809
1810 static void fas216_allocate_tag(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1811 {
1812 #ifdef SCSI2_TAG
1813         /*
1814          * tagged queuing - allocate a new tag to this command
1815          */
1816         if (SCpnt->device->simple_tags && SCpnt->cmnd[0] != REQUEST_SENSE &&
1817             SCpnt->cmnd[0] != INQUIRY) {
1818             SCpnt->device->current_tag += 1;
1819                 if (SCpnt->device->current_tag == 0)
1820                     SCpnt->device->current_tag = 1;
1821                         SCpnt->tag = SCpnt->device->current_tag;
1822         } else
1823 #endif
1824                 set_bit(SCpnt->device->id * 8 + SCpnt->device->lun, info->busyluns);
1825
1826         info->stats.removes += 1;
1827         switch (SCpnt->cmnd[0]) {
1828         case WRITE_6:
1829         case WRITE_10:
1830         case WRITE_12:
1831                 info->stats.writes += 1;
1832                 break;
1833         case READ_6:
1834         case READ_10:
1835         case READ_12:
1836                 info->stats.reads += 1;
1837                 break;
1838         default:
1839                 info->stats.miscs += 1;
1840                 break;
1841         }
1842 }
1843
1844 static void fas216_do_bus_device_reset(FAS216_Info *info,
1845                                        struct 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         struct 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 fas216_devicereset_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
1982                                     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 fas216_rq_sns_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
2000                                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         scsi_eh_restore_cmnd(SCpnt, &info->ses);
2022         SCpnt->scsi_done(SCpnt);
2023 }
2024
2025 /**
2026  * fas216_std_done - finish processing of standard command
2027  * @info: interface that completed
2028  * @SCpnt: command that completed
2029  * @result: driver byte of result
2030  *
2031  * Finish processing of standard command
2032  */
2033 static void
2034 fas216_std_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, unsigned int result)
2035 {
2036         info->stats.fins += 1;
2037
2038         SCpnt->result = result << 16 | info->scsi.SCp.Message << 8 |
2039                         info->scsi.SCp.Status;
2040
2041         fas216_log_command(info, LOG_CONNECT, SCpnt,
2042                 "command complete, result=0x%08x", SCpnt->result);
2043
2044         /*
2045          * If the driver detected an error, we're all done.
2046          */
2047         if (host_byte(SCpnt->result) != DID_OK ||
2048             msg_byte(SCpnt->result) != COMMAND_COMPLETE)
2049                 goto done;
2050
2051         /*
2052          * If the command returned CHECK_CONDITION or COMMAND_TERMINATED
2053          * status, request the sense information.
2054          */
2055         if (status_byte(SCpnt->result) == CHECK_CONDITION ||
2056             status_byte(SCpnt->result) == COMMAND_TERMINATED)
2057                 goto request_sense;
2058
2059         /*
2060          * If the command did not complete with GOOD status,
2061          * we are all done here.
2062          */
2063         if (status_byte(SCpnt->result) != GOOD)
2064                 goto done;
2065
2066         /*
2067          * We have successfully completed a command.  Make sure that
2068          * we do not have any buffers left to transfer.  The world
2069          * is not perfect, and we seem to occasionally hit this.
2070          * It can be indicative of a buggy driver, target or the upper
2071          * levels of the SCSI code.
2072          */
2073         if (info->scsi.SCp.ptr) {
2074                 switch (SCpnt->cmnd[0]) {
2075                 case INQUIRY:
2076                 case START_STOP:
2077                 case MODE_SENSE:
2078                         break;
2079
2080                 default:
2081                         printk(KERN_ERR "scsi%d.%c: incomplete data transfer "
2082                                 "detected: res=%08X ptr=%p len=%X CDB: ",
2083                                 info->host->host_no, '0' + SCpnt->device->id,
2084                                 SCpnt->result, info->scsi.SCp.ptr,
2085                                 info->scsi.SCp.this_residual);
2086                         __scsi_print_command(SCpnt->cmnd);
2087                         SCpnt->result &= ~(255 << 16);
2088                         SCpnt->result |= DID_BAD_TARGET << 16;
2089                         goto request_sense;
2090                 }
2091         }
2092
2093 done:
2094         if (SCpnt->scsi_done) {
2095                 SCpnt->scsi_done(SCpnt);
2096                 return;
2097         }
2098
2099         panic("scsi%d.H: null scsi_done function in fas216_done",
2100                 info->host->host_no);
2101
2102
2103 request_sense:
2104         if (SCpnt->cmnd[0] == REQUEST_SENSE)
2105                 goto done;
2106
2107         scsi_eh_prep_cmnd(SCpnt, &info->ses, NULL, 0, ~0);
2108         fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
2109                           "requesting sense");
2110         init_SCp(SCpnt);
2111         SCpnt->SCp.Message = 0;
2112         SCpnt->SCp.Status = 0;
2113         SCpnt->tag = 0;
2114         SCpnt->host_scribble = (void *)fas216_rq_sns_done;
2115
2116         /*
2117          * Place this command into the high priority "request
2118          * sense" slot.  This will be the very next command
2119          * executed, unless a target connects to us.
2120          */
2121         if (info->reqSCpnt)
2122                 printk(KERN_WARNING "scsi%d.%c: losing request command\n",
2123                         info->host->host_no, '0' + SCpnt->device->id);
2124         info->reqSCpnt = SCpnt;
2125 }
2126
2127 /**
2128  * fas216_done - complete processing for current command
2129  * @info: interface that completed
2130  * @result: driver byte of result
2131  *
2132  * Complete processing for current command
2133  */
2134 static void fas216_done(FAS216_Info *info, unsigned int result)
2135 {
2136         void (*fn)(FAS216_Info *, struct scsi_cmnd *, unsigned int);
2137         struct scsi_cmnd *SCpnt;
2138         unsigned long flags;
2139
2140         fas216_checkmagic(info);
2141
2142         if (!info->SCpnt)
2143                 goto no_command;
2144
2145         SCpnt = info->SCpnt;
2146         info->SCpnt = NULL;
2147         info->scsi.phase = PHASE_IDLE;
2148
2149         if (info->scsi.aborting) {
2150                 fas216_log(info, 0, "uncaught abort - returning DID_ABORT");
2151                 result = DID_ABORT;
2152                 info->scsi.aborting = 0;
2153         }
2154
2155         /*
2156          * Sanity check the completion - if we have zero bytes left
2157          * to transfer, we should not have a valid pointer.
2158          */
2159         if (info->scsi.SCp.ptr && info->scsi.SCp.this_residual == 0) {
2160                 printk("scsi%d.%c: zero bytes left to transfer, but "
2161                        "buffer pointer still valid: ptr=%p len=%08x CDB: ",
2162                        info->host->host_no, '0' + SCpnt->device->id,
2163                        info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
2164                 info->scsi.SCp.ptr = NULL;
2165                 __scsi_print_command(SCpnt->cmnd);
2166         }
2167
2168         /*
2169          * Clear down this command as completed.  If we need to request
2170          * the sense information, fas216_kick will re-assert the busy
2171          * status.
2172          */
2173         info->device[SCpnt->device->id].parity_check = 0;
2174         clear_bit(SCpnt->device->id * 8 + SCpnt->device->lun, info->busyluns);
2175
2176         fn = (void (*)(FAS216_Info *, struct scsi_cmnd *, unsigned int))SCpnt->host_scribble;
2177         fn(info, SCpnt, result);
2178
2179         if (info->scsi.irq) {
2180                 spin_lock_irqsave(&info->host_lock, flags);
2181                 if (info->scsi.phase == PHASE_IDLE)
2182                         fas216_kick(info);
2183                 spin_unlock_irqrestore(&info->host_lock, flags);
2184         }
2185         return;
2186
2187 no_command:
2188         panic("scsi%d.H: null command in fas216_done",
2189                 info->host->host_no);
2190 }
2191
2192 /**
2193  * fas216_queue_command - queue a command for adapter to process.
2194  * @SCpnt: Command to queue
2195  * @done: done function to call once command is complete
2196  *
2197  * Queue a command for adapter to process.
2198  * Returns: 0 on success, else error.
2199  * Notes: io_request_lock is held, interrupts are disabled.
2200  */
2201 static int fas216_queue_command_lck(struct scsi_cmnd *SCpnt,
2202                          void (*done)(struct scsi_cmnd *))
2203 {
2204         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2205         int result;
2206
2207         fas216_checkmagic(info);
2208
2209         fas216_log_command(info, LOG_CONNECT, SCpnt,
2210                            "received command (%p)", SCpnt);
2211
2212         SCpnt->scsi_done = done;
2213         SCpnt->host_scribble = (void *)fas216_std_done;
2214         SCpnt->result = 0;
2215
2216         init_SCp(SCpnt);
2217
2218         info->stats.queues += 1;
2219         SCpnt->tag = 0;
2220
2221         spin_lock(&info->host_lock);
2222
2223         /*
2224          * Add command into execute queue and let it complete under
2225          * whatever scheme we're using.
2226          */
2227         result = !queue_add_cmd_ordered(&info->queues.issue, SCpnt);
2228
2229         /*
2230          * If we successfully added the command,
2231          * kick the interface to get it moving.
2232          */
2233         if (result == 0 && info->scsi.phase == PHASE_IDLE)
2234                 fas216_kick(info);
2235         spin_unlock(&info->host_lock);
2236
2237         fas216_log_target(info, LOG_CONNECT, -1, "queue %s",
2238                 result ? "failure" : "success");
2239
2240         return result;
2241 }
2242
2243 DEF_SCSI_QCMD(fas216_queue_command)
2244
2245 /**
2246  * fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command
2247  * @SCpnt: Command to wake
2248  *
2249  * Trigger restart of a waiting thread in fas216_command
2250  */
2251 static void fas216_internal_done(struct scsi_cmnd *SCpnt)
2252 {
2253         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2254
2255         fas216_checkmagic(info);
2256
2257         info->internal_done = 1;
2258 }
2259
2260 /**
2261  * fas216_noqueue_command - process a command for the adapter.
2262  * @SCpnt: Command to queue
2263  *
2264  * Queue a command for adapter to process.
2265  * Returns: scsi result code.
2266  * Notes: io_request_lock is held, interrupts are disabled.
2267  */
2268 static int fas216_noqueue_command_lck(struct scsi_cmnd *SCpnt,
2269                            void (*done)(struct scsi_cmnd *))
2270 {
2271         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2272
2273         fas216_checkmagic(info);
2274
2275         /*
2276          * We should only be using this if we don't have an interrupt.
2277          * Provide some "incentive" to use the queueing code.
2278          */
2279         BUG_ON(info->scsi.irq);
2280
2281         info->internal_done = 0;
2282         fas216_queue_command_lck(SCpnt, fas216_internal_done);
2283
2284         /*
2285          * This wastes time, since we can't return until the command is
2286          * complete. We can't sleep either since we may get re-entered!
2287          * However, we must re-enable interrupts, or else we'll be
2288          * waiting forever.
2289          */
2290         spin_unlock_irq(info->host->host_lock);
2291
2292         while (!info->internal_done) {
2293                 /*
2294                  * If we don't have an IRQ, then we must poll the card for
2295                  * it's interrupt, and use that to call this driver's
2296                  * interrupt routine.  That way, we keep the command
2297                  * progressing.  Maybe we can add some intelligence here
2298                  * and go to sleep if we know that the device is going
2299                  * to be some time (eg, disconnected).
2300                  */
2301                 if (fas216_readb(info, REG_STAT) & STAT_INT) {
2302                         spin_lock_irq(info->host->host_lock);
2303                         fas216_intr(info);
2304                         spin_unlock_irq(info->host->host_lock);
2305                 }
2306         }
2307
2308         spin_lock_irq(info->host->host_lock);
2309
2310         done(SCpnt);
2311
2312         return 0;
2313 }
2314
2315 DEF_SCSI_QCMD(fas216_noqueue_command)
2316
2317 /*
2318  * Error handler timeout function.  Indicate that we timed out,
2319  * and wake up any error handler process so it can continue.
2320  */
2321 static void fas216_eh_timer(unsigned long data)
2322 {
2323         FAS216_Info *info = (FAS216_Info *)data;
2324
2325         fas216_log(info, LOG_ERROR, "error handling timed out\n");
2326
2327         del_timer(&info->eh_timer);
2328
2329         if (info->rst_bus_status == 0)
2330                 info->rst_bus_status = -1;
2331         if (info->rst_dev_status == 0)
2332                 info->rst_dev_status = -1;
2333
2334         wake_up(&info->eh_wait);
2335 }
2336
2337 enum res_find {
2338         res_failed,             /* not found                    */
2339         res_success,            /* command on issue queue       */
2340         res_hw_abort            /* command on disconnected dev  */
2341 };
2342
2343 /**
2344  * fas216_do_abort - decide how to abort a command
2345  * @SCpnt: command to abort
2346  *
2347  * Decide how to abort a command.
2348  * Returns: abort status
2349  */
2350 static enum res_find fas216_find_command(FAS216_Info *info,
2351                                          struct scsi_cmnd *SCpnt)
2352 {
2353         enum res_find res = res_failed;
2354
2355         if (queue_remove_cmd(&info->queues.issue, SCpnt)) {
2356                 /*
2357                  * The command was on the issue queue, and has not been
2358                  * issued yet.  We can remove the command from the queue,
2359                  * and acknowledge the abort.  Neither the device nor the
2360                  * interface know about the command.
2361                  */
2362                 printk("on issue queue ");
2363
2364                 res = res_success;
2365         } else if (queue_remove_cmd(&info->queues.disconnected, SCpnt)) {
2366                 /*
2367                  * The command was on the disconnected queue.  We must
2368                  * reconnect with the device if possible, and send it
2369                  * an abort message.
2370                  */
2371                 printk("on disconnected queue ");
2372
2373                 res = res_hw_abort;
2374         } else if (info->SCpnt == SCpnt) {
2375                 printk("executing ");
2376
2377                 switch (info->scsi.phase) {
2378                 /*
2379                  * If the interface is idle, and the command is 'disconnectable',
2380                  * then it is the same as on the disconnected queue.
2381                  */
2382                 case PHASE_IDLE:
2383                         if (info->scsi.disconnectable) {
2384                                 info->scsi.disconnectable = 0;
2385                                 info->SCpnt = NULL;
2386                                 res = res_hw_abort;
2387                         }
2388                         break;
2389
2390                 default:
2391                         break;
2392                 }
2393         } else if (info->origSCpnt == SCpnt) {
2394                 /*
2395                  * The command will be executed next, but a command
2396                  * is currently using the interface.  This is similar to
2397                  * being on the issue queue, except the busylun bit has
2398                  * been set.
2399                  */
2400                 info->origSCpnt = NULL;
2401                 clear_bit(SCpnt->device->id * 8 + SCpnt->device->lun, info->busyluns);
2402                 printk("waiting for execution ");
2403                 res = res_success;
2404         } else
2405                 printk("unknown ");
2406
2407         return res;
2408 }
2409
2410 /**
2411  * fas216_eh_abort - abort this command
2412  * @SCpnt: command to abort
2413  *
2414  * Abort this command.
2415  * Returns: FAILED if unable to abort
2416  * Notes: io_request_lock is taken, and irqs are disabled
2417  */
2418 int fas216_eh_abort(struct scsi_cmnd *SCpnt)
2419 {
2420         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2421         int result = FAILED;
2422
2423         fas216_checkmagic(info);
2424
2425         info->stats.aborts += 1;
2426
2427         printk(KERN_WARNING "scsi%d: abort command ", info->host->host_no);
2428         __scsi_print_command(SCpnt->cmnd);
2429
2430         print_debug_list();
2431         fas216_dumpstate(info);
2432
2433         printk(KERN_WARNING "scsi%d: abort %p ", info->host->host_no, SCpnt);
2434
2435         switch (fas216_find_command(info, SCpnt)) {
2436         /*
2437          * We found the command, and cleared it out.  Either
2438          * the command is still known to be executing on the
2439          * target, or the busylun bit is not set.
2440          */
2441         case res_success:
2442                 printk("success\n");
2443                 result = SUCCESS;
2444                 break;
2445
2446         /*
2447          * We need to reconnect to the target and send it an
2448          * ABORT or ABORT_TAG message.  We can only do this
2449          * if the bus is free.
2450          */
2451         case res_hw_abort:
2452
2453
2454         /*
2455          * We are unable to abort the command for some reason.
2456          */
2457         default:
2458         case res_failed:
2459                 printk("failed\n");
2460                 break;
2461         }
2462
2463         return result;
2464 }
2465
2466 /**
2467  * fas216_eh_device_reset - Reset the device associated with this command
2468  * @SCpnt: command specifing device to reset
2469  *
2470  * Reset the device associated with this command.
2471  * Returns: FAILED if unable to reset.
2472  * Notes: We won't be re-entered, so we'll only have one device
2473  * reset on the go at one time.
2474  */
2475 int fas216_eh_device_reset(struct scsi_cmnd *SCpnt)
2476 {
2477         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2478         unsigned long flags;
2479         int i, res = FAILED, target = SCpnt->device->id;
2480
2481         fas216_log(info, LOG_ERROR, "device reset for target %d", target);
2482
2483         spin_lock_irqsave(&info->host_lock, flags);
2484
2485         do {
2486                 /*
2487                  * If we are currently connected to a device, and
2488                  * it is the device we want to reset, there is
2489                  * nothing we can do here.  Chances are it is stuck,
2490                  * and we need a bus reset.
2491                  */
2492                 if (info->SCpnt && !info->scsi.disconnectable &&
2493                     info->SCpnt->device->id == SCpnt->device->id)
2494                         break;
2495
2496                 /*
2497                  * We're going to be resetting this device.  Remove
2498                  * all pending commands from the driver.  By doing
2499                  * so, we guarantee that we won't touch the command
2500                  * structures except to process the reset request.
2501                  */
2502                 queue_remove_all_target(&info->queues.issue, target);
2503                 queue_remove_all_target(&info->queues.disconnected, target);
2504                 if (info->origSCpnt && info->origSCpnt->device->id == target)
2505                         info->origSCpnt = NULL;
2506                 if (info->reqSCpnt && info->reqSCpnt->device->id == target)
2507                         info->reqSCpnt = NULL;
2508                 for (i = 0; i < 8; i++)
2509                         clear_bit(target * 8 + i, info->busyluns);
2510
2511                 /*
2512                  * Hijack this SCSI command structure to send
2513                  * a bus device reset message to this device.
2514                  */
2515                 SCpnt->host_scribble = (void *)fas216_devicereset_done;
2516
2517                 info->rst_dev_status = 0;
2518                 info->rstSCpnt = SCpnt;
2519
2520                 if (info->scsi.phase == PHASE_IDLE)
2521                         fas216_kick(info);
2522
2523                 mod_timer(&info->eh_timer, jiffies + 30 * HZ);
2524                 spin_unlock_irqrestore(&info->host_lock, flags);
2525
2526                 /*
2527                  * Wait up to 30 seconds for the reset to complete.
2528                  */
2529                 wait_event(info->eh_wait, info->rst_dev_status);
2530
2531                 del_timer_sync(&info->eh_timer);
2532                 spin_lock_irqsave(&info->host_lock, flags);
2533                 info->rstSCpnt = NULL;
2534
2535                 if (info->rst_dev_status == 1)
2536                         res = SUCCESS;
2537         } while (0);
2538
2539         SCpnt->host_scribble = NULL;
2540         spin_unlock_irqrestore(&info->host_lock, flags);
2541
2542         fas216_log(info, LOG_ERROR, "device reset complete: %s\n",
2543                    res == SUCCESS ? "success" : "failed");
2544
2545         return res;
2546 }
2547
2548 /**
2549  * fas216_eh_bus_reset - Reset the bus associated with the command
2550  * @SCpnt: command specifing bus to reset
2551  *
2552  * Reset the bus associated with the command.
2553  * Returns: FAILED if unable to reset.
2554  * Notes: Further commands are blocked.
2555  */
2556 int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt)
2557 {
2558         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2559         unsigned long flags;
2560         struct scsi_device *SDpnt;
2561
2562         fas216_checkmagic(info);
2563         fas216_log(info, LOG_ERROR, "resetting bus");
2564
2565         info->stats.bus_resets += 1;
2566
2567         spin_lock_irqsave(&info->host_lock, flags);
2568
2569         /*
2570          * Stop all activity on this interface.
2571          */
2572         fas216_aborttransfer(info);
2573         fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
2574
2575         /*
2576          * Clear any pending interrupts.
2577          */
2578         while (fas216_readb(info, REG_STAT) & STAT_INT)
2579                 fas216_readb(info, REG_INST);
2580
2581         info->rst_bus_status = 0;
2582
2583         /*
2584          * For each attached hard-reset device, clear out
2585          * all command structures.  Leave the running
2586          * command in place.
2587          */
2588         shost_for_each_device(SDpnt, info->host) {
2589                 int i;
2590
2591                 if (SDpnt->soft_reset)
2592                         continue;
2593
2594                 queue_remove_all_target(&info->queues.issue, SDpnt->id);
2595                 queue_remove_all_target(&info->queues.disconnected, SDpnt->id);
2596                 if (info->origSCpnt && info->origSCpnt->device->id == SDpnt->id)
2597                         info->origSCpnt = NULL;
2598                 if (info->reqSCpnt && info->reqSCpnt->device->id == SDpnt->id)
2599                         info->reqSCpnt = NULL;
2600                 info->SCpnt = NULL;
2601
2602                 for (i = 0; i < 8; i++)
2603                         clear_bit(SDpnt->id * 8 + i, info->busyluns);
2604         }
2605
2606         info->scsi.phase = PHASE_IDLE;
2607
2608         /*
2609          * Reset the SCSI bus.  Device cleanup happens in
2610          * the interrupt handler.
2611          */
2612         fas216_cmd(info, CMD_RESETSCSI);
2613
2614         mod_timer(&info->eh_timer, jiffies + HZ);
2615         spin_unlock_irqrestore(&info->host_lock, flags);
2616
2617         /*
2618          * Wait one second for the interrupt.
2619          */
2620         wait_event(info->eh_wait, info->rst_bus_status);
2621         del_timer_sync(&info->eh_timer);
2622
2623         fas216_log(info, LOG_ERROR, "bus reset complete: %s\n",
2624                    info->rst_bus_status == 1 ? "success" : "failed");
2625
2626         return info->rst_bus_status == 1 ? SUCCESS : FAILED;
2627 }
2628
2629 /**
2630  * fas216_init_chip - Initialise FAS216 state after reset
2631  * @info: state structure for interface
2632  *
2633  * Initialise FAS216 state after reset
2634  */
2635 static void fas216_init_chip(FAS216_Info *info)
2636 {
2637         unsigned int clock = ((info->ifcfg.clockrate - 1) / 5 + 1) & 7;
2638         fas216_writeb(info, REG_CLKF, clock);
2639         fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2640         fas216_writeb(info, REG_CNTL2, info->scsi.cfg[1]);
2641         fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
2642         fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
2643         fas216_writeb(info, REG_SOF, 0);
2644         fas216_writeb(info, REG_STP, info->scsi.async_stp);
2645         fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2646 }
2647
2648 /**
2649  * fas216_eh_host_reset - Reset the host associated with this command
2650  * @SCpnt: command specifing host to reset
2651  *
2652  * Reset the host associated with this command.
2653  * Returns: FAILED if unable to reset.
2654  * Notes: io_request_lock is taken, and irqs are disabled
2655  */
2656 int fas216_eh_host_reset(struct scsi_cmnd *SCpnt)
2657 {
2658         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2659
2660         spin_lock_irq(info->host->host_lock);
2661
2662         fas216_checkmagic(info);
2663
2664         printk("scsi%d.%c: %s: resetting host\n",
2665                 info->host->host_no, '0' + SCpnt->device->id, __func__);
2666
2667         /*
2668          * Reset the SCSI chip.
2669          */
2670         fas216_cmd(info, CMD_RESETCHIP);
2671
2672         /*
2673          * Ugly ugly ugly!
2674          * We need to release the host_lock and enable
2675          * IRQs if we sleep, but we must relock and disable
2676          * IRQs after the sleep.
2677          */
2678         spin_unlock_irq(info->host->host_lock);
2679         msleep(50 * 1000/100);
2680         spin_lock_irq(info->host->host_lock);
2681
2682         /*
2683          * Release the SCSI reset.
2684          */
2685         fas216_cmd(info, CMD_NOP);
2686
2687         fas216_init_chip(info);
2688
2689         spin_unlock_irq(info->host->host_lock);
2690         return SUCCESS;
2691 }
2692
2693 #define TYPE_UNKNOWN    0
2694 #define TYPE_NCR53C90   1
2695 #define TYPE_NCR53C90A  2
2696 #define TYPE_NCR53C9x   3
2697 #define TYPE_Am53CF94   4
2698 #define TYPE_EmFAS216   5
2699 #define TYPE_QLFAS216   6
2700
2701 static char *chip_types[] = {
2702         "unknown",
2703         "NS NCR53C90",
2704         "NS NCR53C90A",
2705         "NS NCR53C9x",
2706         "AMD Am53CF94",
2707         "Emulex FAS216",
2708         "QLogic FAS216"
2709 };
2710
2711 static int fas216_detect_type(FAS216_Info *info)
2712 {
2713         int family, rev;
2714
2715         /*
2716          * Reset the chip.
2717          */
2718         fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2719         udelay(50);
2720         fas216_writeb(info, REG_CMD, CMD_NOP);
2721
2722         /*
2723          * Check to see if control reg 2 is present.
2724          */
2725         fas216_writeb(info, REG_CNTL3, 0);
2726         fas216_writeb(info, REG_CNTL2, CNTL2_S2FE);
2727
2728         /*
2729          * If we are unable to read back control reg 2
2730          * correctly, it is not present, and we have a
2731          * NCR53C90.
2732          */
2733         if ((fas216_readb(info, REG_CNTL2) & (~0xe0)) != CNTL2_S2FE)
2734                 return TYPE_NCR53C90;
2735
2736         /*
2737          * Now, check control register 3
2738          */
2739         fas216_writeb(info, REG_CNTL2, 0);
2740         fas216_writeb(info, REG_CNTL3, 0);
2741         fas216_writeb(info, REG_CNTL3, 5);
2742
2743         /*
2744          * If we are unable to read the register back
2745          * correctly, we have a NCR53C90A
2746          */
2747         if (fas216_readb(info, REG_CNTL3) != 5)
2748                 return TYPE_NCR53C90A;
2749
2750         /*
2751          * Now read the ID from the chip.
2752          */
2753         fas216_writeb(info, REG_CNTL3, 0);
2754
2755         fas216_writeb(info, REG_CNTL3, CNTL3_ADIDCHK);
2756         fas216_writeb(info, REG_CNTL3, 0);
2757
2758         fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2759         udelay(50);
2760         fas216_writeb(info, REG_CMD, CMD_WITHDMA | CMD_NOP);
2761
2762         fas216_writeb(info, REG_CNTL2, CNTL2_ENF);
2763         fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2764         udelay(50);
2765         fas216_writeb(info, REG_CMD, CMD_NOP);
2766
2767         rev     = fas216_readb(info, REG_ID);
2768         family  = rev >> 3;
2769         rev    &= 7;
2770
2771         switch (family) {
2772         case 0x01:
2773                 if (rev == 4)
2774                         return TYPE_Am53CF94;
2775                 break;
2776
2777         case 0x02:
2778                 switch (rev) {
2779                 case 2:
2780                         return TYPE_EmFAS216;
2781                 case 3:
2782                         return TYPE_QLFAS216;
2783                 }
2784                 break;
2785
2786         default:
2787                 break;
2788         }
2789         printk("family %x rev %x\n", family, rev);
2790         return TYPE_NCR53C9x;
2791 }
2792
2793 /**
2794  * fas216_reset_state - Initialise driver internal state
2795  * @info: state to initialise
2796  *
2797  * Initialise driver internal state
2798  */
2799 static void fas216_reset_state(FAS216_Info *info)
2800 {
2801         int i;
2802
2803         fas216_checkmagic(info);
2804
2805         fas216_bus_reset(info);
2806
2807         /*
2808          * Clear out all stale info in our state structure
2809          */
2810         memset(info->busyluns, 0, sizeof(info->busyluns));
2811         info->scsi.disconnectable = 0;
2812         info->scsi.aborting = 0;
2813
2814         for (i = 0; i < 8; i++) {
2815                 info->device[i].parity_enabled  = 0;
2816                 info->device[i].parity_check    = 1;
2817         }
2818
2819         /*
2820          * Drain all commands on disconnected queue
2821          */
2822         while (queue_remove(&info->queues.disconnected) != NULL);
2823
2824         /*
2825          * Remove executing commands.
2826          */
2827         info->SCpnt     = NULL;
2828         info->reqSCpnt  = NULL;
2829         info->rstSCpnt  = NULL;
2830         info->origSCpnt = NULL;
2831 }
2832
2833 /**
2834  * fas216_init - initialise FAS/NCR/AMD SCSI structures.
2835  * @host: a driver-specific filled-out structure
2836  *
2837  * Initialise FAS/NCR/AMD SCSI structures.
2838  * Returns: 0 on success
2839  */
2840 int fas216_init(struct Scsi_Host *host)
2841 {
2842         FAS216_Info *info = (FAS216_Info *)host->hostdata;
2843
2844         info->magic_start    = MAGIC;
2845         info->magic_end      = MAGIC;
2846         info->host           = host;
2847         info->scsi.cfg[0]    = host->this_id | CNTL1_PERE;
2848         info->scsi.cfg[1]    = CNTL2_ENF | CNTL2_S2FE;
2849         info->scsi.cfg[2]    = info->ifcfg.cntl3 |
2850                                CNTL3_ADIDCHK | CNTL3_QTAG | CNTL3_G2CB | CNTL3_LBTM;
2851         info->scsi.async_stp = fas216_syncperiod(info, info->ifcfg.asyncperiod);
2852
2853         info->rst_dev_status = -1;
2854         info->rst_bus_status = -1;
2855         init_waitqueue_head(&info->eh_wait);
2856         init_timer(&info->eh_timer);
2857         info->eh_timer.data  = (unsigned long)info;
2858         info->eh_timer.function = fas216_eh_timer;
2859
2860         spin_lock_init(&info->host_lock);
2861
2862         memset(&info->stats, 0, sizeof(info->stats));
2863
2864         msgqueue_initialise(&info->scsi.msgs);
2865
2866         if (!queue_initialise(&info->queues.issue))
2867                 return -ENOMEM;
2868
2869         if (!queue_initialise(&info->queues.disconnected)) {
2870                 queue_free(&info->queues.issue);
2871                 return -ENOMEM;
2872         }
2873
2874         return 0;
2875 }
2876
2877 /**
2878  * fas216_add - initialise FAS/NCR/AMD SCSI ic.
2879  * @host: a driver-specific filled-out structure
2880  * @dev: parent device
2881  *
2882  * Initialise FAS/NCR/AMD SCSI ic.
2883  * Returns: 0 on success
2884  */
2885 int fas216_add(struct Scsi_Host *host, struct device *dev)
2886 {
2887         FAS216_Info *info = (FAS216_Info *)host->hostdata;
2888         int type, ret;
2889
2890         if (info->ifcfg.clockrate <= 10 || info->ifcfg.clockrate > 40) {
2891                 printk(KERN_CRIT "fas216: invalid clock rate %u MHz\n",
2892                         info->ifcfg.clockrate);
2893                 return -EINVAL;
2894         }
2895
2896         fas216_reset_state(info);
2897         type = fas216_detect_type(info);
2898         info->scsi.type = chip_types[type];
2899
2900         udelay(300);
2901
2902         /*
2903          * Initialise the chip correctly.
2904          */
2905         fas216_init_chip(info);
2906
2907         /*
2908          * Reset the SCSI bus.  We don't want to see
2909          * the resulting reset interrupt, so mask it
2910          * out.
2911          */
2912         fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_DISR);
2913         fas216_writeb(info, REG_CMD, CMD_RESETSCSI);
2914
2915         /*
2916          * scsi standard says wait 250ms
2917          */
2918         spin_unlock_irq(info->host->host_lock);
2919         msleep(100*1000/100);
2920         spin_lock_irq(info->host->host_lock);
2921
2922         fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2923         fas216_readb(info, REG_INST);
2924
2925         fas216_checkmagic(info);
2926
2927         ret = scsi_add_host(host, dev);
2928         if (ret)
2929                 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2930         else
2931                 scsi_scan_host(host);
2932
2933         return ret;
2934 }
2935
2936 void fas216_remove(struct Scsi_Host *host)
2937 {
2938         FAS216_Info *info = (FAS216_Info *)host->hostdata;
2939
2940         fas216_checkmagic(info);
2941         scsi_remove_host(host);
2942
2943         fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2944         scsi_host_put(host);
2945 }
2946
2947 /**
2948  * fas216_release - release all resources for FAS/NCR/AMD SCSI ic.
2949  * @host: a driver-specific filled-out structure
2950  *
2951  * release all resources and put everything to bed for FAS/NCR/AMD SCSI ic.
2952  */
2953 void fas216_release(struct Scsi_Host *host)
2954 {
2955         FAS216_Info *info = (FAS216_Info *)host->hostdata;
2956
2957         queue_free(&info->queues.disconnected);
2958         queue_free(&info->queues.issue);
2959 }
2960
2961 void fas216_print_host(FAS216_Info *info, struct seq_file *m)
2962 {
2963         seq_printf(m,
2964                         "\n"
2965                         "Chip    : %s\n"
2966                         " Address: 0x%p\n"
2967                         " IRQ    : %d\n"
2968                         " DMA    : %d\n",
2969                         info->scsi.type, info->scsi.io_base,
2970                         info->scsi.irq, info->scsi.dma);
2971 }
2972
2973 void fas216_print_stats(FAS216_Info *info, struct seq_file *m)
2974 {
2975         seq_printf(m, "\n"
2976                         "Command Statistics:\n"
2977                         " Queued     : %u\n"
2978                         " Issued     : %u\n"
2979                         " Completed  : %u\n"
2980                         " Reads      : %u\n"
2981                         " Writes     : %u\n"
2982                         " Others     : %u\n"
2983                         " Disconnects: %u\n"
2984                         " Aborts     : %u\n"
2985                         " Bus resets : %u\n"
2986                         " Host resets: %u\n",
2987                         info->stats.queues,      info->stats.removes,
2988                         info->stats.fins,        info->stats.reads,
2989                         info->stats.writes,      info->stats.miscs,
2990                         info->stats.disconnects, info->stats.aborts,
2991                         info->stats.bus_resets,  info->stats.host_resets);
2992 }
2993
2994 void fas216_print_devices(FAS216_Info *info, struct seq_file *m)
2995 {
2996         struct fas216_device *dev;
2997         struct scsi_device *scd;
2998
2999         seq_printf(m, "Device/Lun TaggedQ       Parity   Sync\n");
3000
3001         shost_for_each_device(scd, info->host) {
3002                 dev = &info->device[scd->id];
3003                 seq_printf(m, "     %d/%d   ", scd->id, scd->lun);
3004                 if (scd->tagged_supported)
3005                         seq_printf(m, "%3sabled(%3d) ",
3006                                      scd->simple_tags ? "en" : "dis",
3007                                      scd->current_tag);
3008                 else
3009                         seq_printf(m, "unsupported   ");
3010
3011                 seq_printf(m, "%3sabled ", dev->parity_enabled ? "en" : "dis");
3012
3013                 if (dev->sof)
3014                         seq_printf(m, "offset %d, %d ns\n",
3015                                      dev->sof, dev->period * 4);
3016                 else
3017                         seq_printf(m, "async\n");
3018         }
3019 }
3020
3021 EXPORT_SYMBOL(fas216_init);
3022 EXPORT_SYMBOL(fas216_add);
3023 EXPORT_SYMBOL(fas216_queue_command);
3024 EXPORT_SYMBOL(fas216_noqueue_command);
3025 EXPORT_SYMBOL(fas216_intr);
3026 EXPORT_SYMBOL(fas216_remove);
3027 EXPORT_SYMBOL(fas216_release);
3028 EXPORT_SYMBOL(fas216_eh_abort);
3029 EXPORT_SYMBOL(fas216_eh_device_reset);
3030 EXPORT_SYMBOL(fas216_eh_bus_reset);
3031 EXPORT_SYMBOL(fas216_eh_host_reset);
3032 EXPORT_SYMBOL(fas216_print_host);
3033 EXPORT_SYMBOL(fas216_print_stats);
3034 EXPORT_SYMBOL(fas216_print_devices);
3035
3036 MODULE_AUTHOR("Russell King");
3037 MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core");
3038 MODULE_LICENSE("GPL");