drivers/scsi/arm/fas216.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/drivers/acorn/scsi/fas216.c
   4  *
   5  *  Copyright (C) 1997-2003 Russell King
   6  *
   7  * Based on information in qlogicfas.c by Tom Zerucha, Michael Griffith, and
   8  * other sources, including:
   9  *   the AMD Am53CF94 data sheet
  10  *   the AMD Am53C94 data sheet
  11  *
  12  * This is a generic driver.  To use it, have a look at cumana_2.c.  You
  13  * should define your own structure that overlays FAS216_Info, eg:
  14  * struct my_host_data {
  15  *    FAS216_Info info;
  16  *    ... my host specific data ...
  17  * };
  18  *
  19  * Changelog:
  20  *  30-08-1997  RMK     Created
  21  *  14-09-1997  RMK     Started disconnect support
  22  *  08-02-1998  RMK     Corrected real DMA support
  23  *  15-02-1998  RMK     Started sync xfer support
  24  *  06-04-1998  RMK     Tightened conditions for printing incomplete
  25  *                      transfers
  26  *  02-05-1998  RMK     Added extra checks in fas216_reset
  27  *  24-05-1998  RMK     Fixed synchronous transfers with period >= 200ns
  28  *  27-06-1998  RMK     Changed asm/delay.h to linux/delay.h
  29  *  26-08-1998  RMK     Improved message support wrt MESSAGE_REJECT
  30  *  02-04-2000  RMK     Converted to use the new error handling, and
  31  *                      automatically request sense data upon check
  32  *                      condition status from targets.
  33  */
  34 #include <linux/module.h>
  35 #include <linux/blkdev.h>
  36 #include <linux/kernel.h>
  37 #include <linux/string.h>
  38 #include <linux/ioport.h>
  39 #include <linux/proc_fs.h>
  40 #include <linux/delay.h>
  41 #include <linux/bitops.h>
  42 #include <linux/init.h>
  43 #include <linux/interrupt.h>
  44
  45 #include <asm/dma.h>
  46 #include <asm/io.h>
  47 #include <asm/irq.h>
  48 #include <asm/ecard.h>
  49
  50 #include "../scsi.h"
  51 #include <scsi/scsi_dbg.h>
  52 #include <scsi/scsi_host.h>
  53 #include "fas216.h"
  54 #include "scsi.h"
  55
  56 /* NOTE: SCSI2 Synchronous transfers *require* DMA according to
  57  *  the data sheet.  This restriction is crazy, especially when
  58  *  you only want to send 16 bytes!  What were the guys who
  59  *  designed this chip on at that time?  Did they read the SCSI2
  60  *  spec at all?  The following sections are taken from the SCSI2
  61  *  standard (s2r10) concerning this:
  62  *
  63  * > IMPLEMENTORS NOTES:
  64  * >   (1)  Re-negotiation at every selection is not recommended, since a
  65  * >   significant performance impact is likely.
  66  *
  67  * >  The implied synchronous agreement shall remain in effect until a BUS DEVICE
  68  * >  RESET message is received, until a hard reset condition occurs, or until one
  69  * >  of the two SCSI devices elects to modify the agreement.  The default data
  70  * >  transfer mode is asynchronous data transfer mode.  The default data transfer
  71  * >  mode is entered at power on, after a BUS DEVICE RESET message, or after a hard
  72  * >  reset condition.
  73  *
  74  *  In total, this means that once you have elected to use synchronous
  75  *  transfers, you must always use DMA.
  76  *
  77  *  I was thinking that this was a good chip until I found this restriction ;(
  78  */
  79 #define SCSI2_SYNC
  80 #undef  SCSI2_TAG
  81
  82 #undef DEBUG_CONNECT
  83 #undef DEBUG_MESSAGES
  84
  85 #undef CHECK_STRUCTURE
  86
  87 #define LOG_CONNECT             (1 << 0)
  88 #define LOG_BUSSERVICE          (1 << 1)
  89 #define LOG_FUNCTIONDONE        (1 << 2)
  90 #define LOG_MESSAGES            (1 << 3)
  91 #define LOG_BUFFER              (1 << 4)
  92 #define LOG_ERROR               (1 << 8)
  93
  94 static int level_mask = LOG_ERROR;
  95
  96 module_param(level_mask, int, 0644);
  97
  98 #ifndef MODULE
  99 static int __init fas216_log_setup(char *str)
 100 {
 101         char *s;
 102
 103         level_mask = 0;
 104
 105         while ((s = strsep(&str, ",")) != NULL) {
 106                 switch (s[0]) {
 107                 case 'a':
 108                         if (strcmp(s, "all") == 0)
 109                                 level_mask |= -1;
 110                         break;
 111                 case 'b':
 112                         if (strncmp(s, "bus", 3) == 0)
 113                                 level_mask |= LOG_BUSSERVICE;
 114                         if (strncmp(s, "buf", 3) == 0)
 115                                 level_mask |= LOG_BUFFER;
 116                         break;
 117                 case 'c':
 118                         level_mask |= LOG_CONNECT;
 119                         break;
 120                 case 'e':
 121                         level_mask |= LOG_ERROR;
 122                         break;
 123                 case 'm':
 124                         level_mask |= LOG_MESSAGES;
 125                         break;
 126                 case 'n':
 127                         if (strcmp(s, "none") == 0)
 128                                 level_mask = 0;
 129                         break;
 130                 case 's':
 131                         level_mask |= LOG_FUNCTIONDONE;
 132                         break;
 133                 }
 134         }
 135         return 1;
 136 }
 137
 138 __setup("fas216_logging=", fas216_log_setup);
 139 #endif
 140
 141 static inline unsigned char fas216_readb(FAS216_Info *info, unsigned int reg)
 142 {
 143         unsigned int off = reg << info->scsi.io_shift;
 144         return readb(info->scsi.io_base + off);
 145 }
 146
 147 static inline void fas216_writeb(FAS216_Info *info, unsigned int reg, unsigned int val)
 148 {
 149         unsigned int off = reg << info->scsi.io_shift;
 150         writeb(val, info->scsi.io_base + off);
 151 }
 152
 153 static void fas216_dumpstate(FAS216_Info *info)
 154 {
 155         unsigned char is, stat, inst;
 156
 157         is   = fas216_readb(info, REG_IS);
 158         stat = fas216_readb(info, REG_STAT);
 159         inst = fas216_readb(info, REG_INST);
 160
 161         printk("FAS216: CTCL=%02X CTCM=%02X CMD=%02X STAT=%02X"
 162                " INST=%02X IS=%02X CFIS=%02X",
 163                 fas216_readb(info, REG_CTCL),
 164                 fas216_readb(info, REG_CTCM),
 165                 fas216_readb(info, REG_CMD),  stat, inst, is,
 166                 fas216_readb(info, REG_CFIS));
 167         printk(" CNTL1=%02X CNTL2=%02X CNTL3=%02X CTCH=%02X\n",
 168                 fas216_readb(info, REG_CNTL1),
 169                 fas216_readb(info, REG_CNTL2),
 170                 fas216_readb(info, REG_CNTL3),
 171                 fas216_readb(info, REG_CTCH));
 172 }
 173
 174 static void print_SCp(struct scsi_pointer *SCp, const char *prefix, const char *suffix)
 175 {
 176         printk("%sptr %p this_residual 0x%x buffer %p buffers_residual 0x%x%s",
 177                 prefix, SCp->ptr, SCp->this_residual, SCp->buffer,
 178                 SCp->buffers_residual, suffix);
 179 }
 180
 181 #ifdef CHECK_STRUCTURE
 182 static void fas216_dumpinfo(FAS216_Info *info)
 183 {
 184         static int used = 0;
 185         int i;
 186
 187         if (used++)
 188                 return;
 189
 190         printk("FAS216_Info=\n");
 191         printk("  { magic_start=%lX host=%p SCpnt=%p origSCpnt=%p\n",
 192                 info->magic_start, info->host, info->SCpnt,
 193                 info->origSCpnt);
 194         printk("    scsi={ io_shift=%X irq=%X cfg={ %X %X %X %X }\n",
 195                 info->scsi.io_shift, info->scsi.irq,
 196                 info->scsi.cfg[0], info->scsi.cfg[1], info->scsi.cfg[2],
 197                 info->scsi.cfg[3]);
 198         printk("           type=%p phase=%X\n",
 199                 info->scsi.type, info->scsi.phase);
 200         print_SCp(&info->scsi.SCp, "           SCp={ ", " }\n");
 201         printk("      msgs async_stp=%X disconnectable=%d aborting=%d }\n",
 202                 info->scsi.async_stp,
 203                 info->scsi.disconnectable, info->scsi.aborting);
 204         printk("    stats={ queues=%X removes=%X fins=%X reads=%X writes=%X miscs=%X\n"
 205                "            disconnects=%X aborts=%X bus_resets=%X host_resets=%X}\n",
 206                 info->stats.queues, info->stats.removes, info->stats.fins,
 207                 info->stats.reads, info->stats.writes, info->stats.miscs,
 208                 info->stats.disconnects, info->stats.aborts, info->stats.bus_resets,
 209                 info->stats.host_resets);
 210         printk("    ifcfg={ clockrate=%X select_timeout=%X asyncperiod=%X sync_max_depth=%X }\n",
 211                 info->ifcfg.clockrate, info->ifcfg.select_timeout,
 212                 info->ifcfg.asyncperiod, info->ifcfg.sync_max_depth);
 213         for (i = 0; i < 8; i++) {
 214                 printk("    busyluns[%d]=%08lx dev[%d]={ disconnect_ok=%d stp=%X sof=%X sync_state=%X }\n",
 215                         i, info->busyluns[i], i,
 216                         info->device[i].disconnect_ok, info->device[i].stp,
 217                         info->device[i].sof, info->device[i].sync_state);
 218         }
 219         printk("    dma={ transfer_type=%X setup=%p pseudo=%p stop=%p }\n",
 220                 info->dma.transfer_type, info->dma.setup,
 221                 info->dma.pseudo, info->dma.stop);
 222         printk("    internal_done=%X magic_end=%lX }\n",
 223                 info->internal_done, info->magic_end);
 224 }
 225
 226 static void __fas216_checkmagic(FAS216_Info *info, const char *func)
 227 {
 228         int corruption = 0;
 229         if (info->magic_start != MAGIC) {
 230                 printk(KERN_CRIT "FAS216 Error: magic at start corrupted\n");
 231                 corruption++;
 232         }
 233         if (info->magic_end != MAGIC) {
 234                 printk(KERN_CRIT "FAS216 Error: magic at end corrupted\n");
 235                 corruption++;
 236         }
 237         if (corruption) {
 238                 fas216_dumpinfo(info);
 239                 panic("scsi memory space corrupted in %s", func);
 240         }
 241 }
 242 #define fas216_checkmagic(info) __fas216_checkmagic((info), __func__)
 243 #else
 244 #define fas216_checkmagic(info)
 245 #endif
 246
 247 static const char *fas216_bus_phase(int stat)
 248 {
 249         static const char *phases[] = {
 250                 "DATA OUT", "DATA IN",
 251                 "COMMAND", "STATUS",
 252                 "MISC OUT", "MISC IN",
 253                 "MESG OUT", "MESG IN"
 254         };
 255
 256         return phases[stat & STAT_BUSMASK];
 257 }
 258
 259 static const char *fas216_drv_phase(FAS216_Info *info)
 260 {
 261         static const char *phases[] = {
 262                 [PHASE_IDLE]            = "idle",
 263                 [PHASE_SELECTION]       = "selection",
 264                 [PHASE_COMMAND]         = "command",
 265                 [PHASE_DATAOUT]         = "data out",
 266                 [PHASE_DATAIN]          = "data in",
 267                 [PHASE_MSGIN]           = "message in",
 268                 [PHASE_MSGIN_DISCONNECT]= "disconnect",
 269                 [PHASE_MSGOUT_EXPECT]   = "expect message out",
 270                 [PHASE_MSGOUT]          = "message out",
 271                 [PHASE_STATUS]          = "status",
 272                 [PHASE_DONE]            = "done",
 273         };
 274
 275         if (info->scsi.phase < ARRAY_SIZE(phases) &&
 276             phases[info->scsi.phase])
 277                 return phases[info->scsi.phase];
 278         return "???";
 279 }
 280
 281 static char fas216_target(FAS216_Info *info)
 282 {
 283         if (info->SCpnt)
 284                 return '0' + info->SCpnt->device->id;
 285         else
 286                 return 'H';
 287 }
 288
 289 static void
 290 fas216_do_log(FAS216_Info *info, char target, char *fmt, va_list ap)
 291 {
 292         static char buf[1024];
 293
 294         vsnprintf(buf, sizeof(buf), fmt, ap);
 295         printk("scsi%d.%c: %s", info->host->host_no, target, buf);
 296 }
 297
 298 static void fas216_log_command(FAS216_Info *info, int level,
 299                                struct scsi_cmnd *SCpnt, char *fmt, ...)
 300 {
 301         va_list args;
 302
 303         if (level != 0 && !(level & level_mask))
 304                 return;
 305
 306         va_start(args, fmt);
 307         fas216_do_log(info, '0' + SCpnt->device->id, fmt, args);
 308         va_end(args);
 309
 310         scsi_print_command(SCpnt);
 311 }
 312
 313 static void
 314 fas216_log_target(FAS216_Info *info, int level, int target, char *fmt, ...)
 315 {
 316         va_list args;
 317
 318         if (level != 0 && !(level & level_mask))
 319                 return;
 320
 321         if (target < 0)
 322                 target = 'H';
 323         else
 324                 target += '0';
 325
 326         va_start(args, fmt);
 327         fas216_do_log(info, target, fmt, args);
 328         va_end(args);
 329
 330         printk("\n");
 331 }
 332
 333 static void fas216_log(FAS216_Info *info, int level, char *fmt, ...)
 334 {
 335         va_list args;
 336
 337         if (level != 0 && !(level & level_mask))
 338                 return;
 339
 340         va_start(args, fmt);
 341         fas216_do_log(info, fas216_target(info), fmt, args);
 342         va_end(args);
 343
 344         printk("\n");
 345 }
 346
 347 #define PH_SIZE 32
 348
 349 static struct { int stat, ssr, isr, ph; } ph_list[PH_SIZE];
 350 static int ph_ptr;
 351
 352 static void add_debug_list(int stat, int ssr, int isr, int ph)
 353 {
 354         ph_list[ph_ptr].stat = stat;
 355         ph_list[ph_ptr].ssr = ssr;
 356         ph_list[ph_ptr].isr = isr;
 357         ph_list[ph_ptr].ph = ph;
 358
 359         ph_ptr = (ph_ptr + 1) & (PH_SIZE-1);
 360 }
 361
 362 static struct { int command; void *from; } cmd_list[8];
 363 static int cmd_ptr;
 364
 365 static void fas216_cmd(FAS216_Info *info, unsigned int command)
 366 {
 367         cmd_list[cmd_ptr].command = command;
 368         cmd_list[cmd_ptr].from = __builtin_return_address(0);
 369
 370         cmd_ptr = (cmd_ptr + 1) & 7;
 371
 372         fas216_writeb(info, REG_CMD, command);
 373 }
 374
 375 static void print_debug_list(void)
 376 {
 377         int i;
 378
 379         i = ph_ptr;
 380
 381         printk(KERN_ERR "SCSI IRQ trail\n");
 382         do {
 383                 printk(" %02x:%02x:%02x:%1x",
 384                         ph_list[i].stat, ph_list[i].ssr,
 385                         ph_list[i].isr, ph_list[i].ph);
 386                 i = (i + 1) & (PH_SIZE - 1);
 387                 if (((i ^ ph_ptr) & 7) == 0)
 388                         printk("\n");
 389         } while (i != ph_ptr);
 390         if ((i ^ ph_ptr) & 7)
 391                 printk("\n");
 392
 393         i = cmd_ptr;
 394         printk(KERN_ERR "FAS216 commands: ");
 395         do {
 396                 printk("%02x:%p ", cmd_list[i].command, cmd_list[i].from);
 397                 i = (i + 1) & 7;
 398         } while (i != cmd_ptr);
 399         printk("\n");
 400 }
 401
 402 static void fas216_done(FAS216_Info *info, unsigned int result);
 403
 404 /**
 405  * fas216_get_last_msg - retrive last message from the list
 406  * @info: interface to search
 407  * @pos: current fifo position
 408  *
 409  * Retrieve a last message from the list, using position in fifo.
 410  */
 411 static inline unsigned short
 412 fas216_get_last_msg(FAS216_Info *info, int pos)
 413 {
 414         unsigned short packed_msg = NOP;
 415         struct message *msg;
 416         int msgnr = 0;
 417
 418         while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
 419                 if (pos >= msg->fifo)
 420                         break;
 421         }
 422
 423         if (msg) {
 424                 if (msg->msg[0] == EXTENDED_MESSAGE)
 425                         packed_msg = EXTENDED_MESSAGE | msg->msg[2] << 8;
 426                 else
 427                         packed_msg = msg->msg[0];
 428         }
 429
 430         fas216_log(info, LOG_MESSAGES,
 431                 "Message: %04x found at position %02x\n", packed_msg, pos);
 432
 433         return packed_msg;
 434 }
 435
 436 /**
 437  * fas216_syncperiod - calculate STP register value
 438  * @info: state structure for interface connected to device
 439  * @ns: period in ns (between subsequent bytes)
 440  *
 441  * Calculate value to be loaded into the STP register for a given period
 442  * in ns. Returns a value suitable for REG_STP.
 443  */
 444 static int fas216_syncperiod(FAS216_Info *info, int ns)
 445 {
 446         int value = (info->ifcfg.clockrate * ns) / 1000;
 447
 448         fas216_checkmagic(info);
 449
 450         if (value < 4)
 451                 value = 4;
 452         else if (value > 35)
 453                 value = 35;
 454
 455         return value & 31;
 456 }
 457
 458 /**
 459  * fas216_set_sync - setup FAS216 chip for specified transfer period.
 460  * @info: state structure for interface connected to device
 461  * @target: target
 462  *
 463  * Correctly setup FAS216 chip for specified transfer period.
 464  * Notes   : we need to switch the chip out of FASTSCSI mode if we have
 465  *           a transfer period >= 200ns - otherwise the chip will violate
 466  *           the SCSI timings.
 467  */
 468 static void fas216_set_sync(FAS216_Info *info, int target)
 469 {
 470         unsigned int cntl3;
 471
 472         fas216_writeb(info, REG_SOF, info->device[target].sof);
 473         fas216_writeb(info, REG_STP, info->device[target].stp);
 474
 475         cntl3 = info->scsi.cfg[2];
 476         if (info->device[target].period >= (200 / 4))
 477                 cntl3 = cntl3 & ~CNTL3_FASTSCSI;
 478
 479         fas216_writeb(info, REG_CNTL3, cntl3);
 480 }
 481
 482 /* Synchronous transfer support
 483  *
 484  * Note: The SCSI II r10 spec says (5.6.12):
 485  *
 486  *  (2)  Due to historical problems with early host adapters that could
 487  *  not accept an SDTR message, some targets may not initiate synchronous
 488  *  negotiation after a power cycle as required by this standard.  Host
 489  *  adapters that support synchronous mode may avoid the ensuing failure
 490  *  modes when the target is independently power cycled by initiating a
 491  *  synchronous negotiation on each REQUEST SENSE and INQUIRY command.
 492  *  This approach increases the SCSI bus overhead and is not recommended
 493  *  for new implementations.  The correct method is to respond to an
 494  *  SDTR message with a MESSAGE REJECT message if the either the
 495  *  initiator or target devices does not support synchronous transfers
 496  *  or does not want to negotiate for synchronous transfers at the time.
 497  *  Using the correct method assures compatibility with wide data
 498  *  transfers and future enhancements.
 499  *
 500  * We will always initiate a synchronous transfer negotiation request on
 501  * every INQUIRY or REQUEST SENSE message, unless the target itself has
 502  * at some point performed a synchronous transfer negotiation request, or
 503  * we have synchronous transfers disabled for this device.
 504  */
 505
 506 /**
 507  * fas216_handlesync - Handle a synchronous transfer message
 508  * @info: state structure for interface
 509  * @msg: message from target
 510  *
 511  * Handle a synchronous transfer message from the target
 512  */
 513 static void fas216_handlesync(FAS216_Info *info, char *msg)
 514 {
 515         struct fas216_device *dev = &info->device[info->SCpnt->device->id];
 516         enum { sync, async, none, reject } res = none;
 517
 518 #ifdef SCSI2_SYNC
 519         switch (msg[0]) {
 520         case MESSAGE_REJECT:
 521                 /* Synchronous transfer request failed.
 522                  * Note: SCSI II r10:
 523                  *
 524                  *  SCSI devices that are capable of synchronous
 525                  *  data transfers shall not respond to an SDTR
 526                  *  message with a MESSAGE REJECT message.
 527                  *
 528                  * Hence, if we get this condition, we disable
 529                  * negotiation for this device.
 530                  */
 531                 if (dev->sync_state == neg_inprogress) {
 532                         dev->sync_state = neg_invalid;
 533                         res = async;
 534                 }
 535                 break;
 536
 537         case EXTENDED_MESSAGE:
 538                 switch (dev->sync_state) {
 539                 /* We don't accept synchronous transfer requests.
 540                  * Respond with a MESSAGE_REJECT to prevent a
 541                  * synchronous transfer agreement from being reached.
 542                  */
 543                 case neg_invalid:
 544                         res = reject;
 545                         break;
 546
 547                 /* We were not negotiating a synchronous transfer,
 548                  * but the device sent us a negotiation request.
 549                  * Honour the request by sending back a SDTR
 550                  * message containing our capability, limited by
 551                  * the targets capability.
 552                  */
 553                 default:
 554                         fas216_cmd(info, CMD_SETATN);
 555                         if (msg[4] > info->ifcfg.sync_max_depth)
 556                                 msg[4] = info->ifcfg.sync_max_depth;
 557                         if (msg[3] < 1000 / info->ifcfg.clockrate)
 558                                 msg[3] = 1000 / info->ifcfg.clockrate;
 559
 560                         msgqueue_flush(&info->scsi.msgs);
 561                         msgqueue_addmsg(&info->scsi.msgs, 5,
 562                                         EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
 563                                         msg[3], msg[4]);
 564                         info->scsi.phase = PHASE_MSGOUT_EXPECT;
 565
 566                         /* This is wrong.  The agreement is not in effect
 567                          * until this message is accepted by the device
 568                          */
 569                         dev->sync_state = neg_targcomplete;
 570                         res = sync;
 571                         break;
 572
 573                 /* We initiated the synchronous transfer negotiation,
 574                  * and have successfully received a response from the
 575                  * target.  The synchronous transfer agreement has been
 576                  * reached.  Note: if the values returned are out of our
 577                  * bounds, we must reject the message.
 578                  */
 579                 case neg_inprogress:
 580                         res = reject;
 581                         if (msg[4] <= info->ifcfg.sync_max_depth &&
 582                             msg[3] >= 1000 / info->ifcfg.clockrate) {
 583                                 dev->sync_state = neg_complete;
 584                                 res = sync;
 585                         }
 586                         break;
 587                 }
 588         }
 589 #else
 590         res = reject;
 591 #endif
 592
 593         switch (res) {
 594         case sync:
 595                 dev->period = msg[3];
 596                 dev->sof    = msg[4];
 597                 dev->stp    = fas216_syncperiod(info, msg[3] * 4);
 598                 fas216_set_sync(info, info->SCpnt->device->id);
 599                 break;
 600
 601         case reject:
 602                 fas216_cmd(info, CMD_SETATN);
 603                 msgqueue_flush(&info->scsi.msgs);
 604                 msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
 605                 info->scsi.phase = PHASE_MSGOUT_EXPECT;
 606                 fallthrough;
 607
 608         case async:
 609                 dev->period = info->ifcfg.asyncperiod / 4;
 610                 dev->sof    = 0;
 611                 dev->stp    = info->scsi.async_stp;
 612                 fas216_set_sync(info, info->SCpnt->device->id);
 613                 break;
 614
 615         case none:
 616                 break;
 617         }
 618 }
 619
 620 /**
 621  * fas216_updateptrs - update data pointers after transfer suspended/paused
 622  * @info: interface's local pointer to update
 623  * @bytes_transferred: number of bytes transferred
 624  *
 625  * Update data pointers after transfer suspended/paused
 626  */
 627 static void fas216_updateptrs(FAS216_Info *info, int bytes_transferred)
 628 {
 629         struct scsi_pointer *SCp = &info->scsi.SCp;
 630
 631         fas216_checkmagic(info);
 632
 633         BUG_ON(bytes_transferred < 0);
 634
 635         SCp->phase -= bytes_transferred;
 636
 637         while (bytes_transferred != 0) {
 638                 if (SCp->this_residual > bytes_transferred)
 639                         break;
 640                 /*
 641                  * We have used up this buffer.  Move on to the
 642                  * next buffer.
 643                  */
 644                 bytes_transferred -= SCp->this_residual;
 645                 if (!next_SCp(SCp) && bytes_transferred) {
 646                         printk(KERN_WARNING "scsi%d.%c: out of buffers\n",
 647                                 info->host->host_no, '0' + info->SCpnt->device->id);
 648                         return;
 649                 }
 650         }
 651
 652         SCp->this_residual -= bytes_transferred;
 653         if (SCp->this_residual)
 654                 SCp->ptr += bytes_transferred;
 655         else
 656                 SCp->ptr = NULL;
 657 }
 658
 659 /**
 660  * fas216_pio - transfer data off of/on to card using programmed IO
 661  * @info: interface to transfer data to/from
 662  * @direction: direction to transfer data (DMA_OUT/DMA_IN)
 663  *
 664  * Transfer data off of/on to card using programmed IO.
 665  * Notes: this is incredibly slow.
 666  */
 667 static void fas216_pio(FAS216_Info *info, fasdmadir_t direction)
 668 {
 669         struct scsi_pointer *SCp = &info->scsi.SCp;
 670
 671         fas216_checkmagic(info);
 672
 673         if (direction == DMA_OUT)
 674                 fas216_writeb(info, REG_FF, get_next_SCp_byte(SCp));
 675         else
 676                 put_next_SCp_byte(SCp, fas216_readb(info, REG_FF));
 677
 678         if (SCp->this_residual == 0)
 679                 next_SCp(SCp);
 680 }
 681
 682 static void fas216_set_stc(FAS216_Info *info, unsigned int length)
 683 {
 684         fas216_writeb(info, REG_STCL, length);
 685         fas216_writeb(info, REG_STCM, length >> 8);
 686         fas216_writeb(info, REG_STCH, length >> 16);
 687 }
 688
 689 static unsigned int fas216_get_ctc(FAS216_Info *info)
 690 {
 691         return fas216_readb(info, REG_CTCL) +
 692                (fas216_readb(info, REG_CTCM) << 8) +
 693                (fas216_readb(info, REG_CTCH) << 16);
 694 }
 695
 696 /**
 697  * fas216_cleanuptransfer - clean up after a transfer has completed.
 698  * @info: interface to clean up
 699  *
 700  * Update the data pointers according to the number of bytes transferred
 701  * on the SCSI bus.
 702  */
 703 static void fas216_cleanuptransfer(FAS216_Info *info)
 704 {
 705         unsigned long total, residual, fifo;
 706         fasdmatype_t dmatype = info->dma.transfer_type;
 707
 708         info->dma.transfer_type = fasdma_none;
 709
 710         /*
 711          * PIO transfers do not need to be cleaned up.
 712          */
 713         if (dmatype == fasdma_pio || dmatype == fasdma_none)
 714                 return;
 715
 716         if (dmatype == fasdma_real_all)
 717                 total = info->scsi.SCp.phase;
 718         else
 719                 total = info->scsi.SCp.this_residual;
 720
 721         residual = fas216_get_ctc(info);
 722
 723         fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
 724
 725         fas216_log(info, LOG_BUFFER, "cleaning up from previous "
 726                    "transfer: length 0x%06x, residual 0x%x, fifo %d",
 727                    total, residual, fifo);
 728
 729         /*
 730          * If we were performing Data-Out, the transfer counter
 731          * counts down each time a byte is transferred by the
 732          * host to the FIFO.  This means we must include the
 733          * bytes left in the FIFO from the transfer counter.
 734          */
 735         if (info->scsi.phase == PHASE_DATAOUT)
 736                 residual += fifo;
 737
 738         fas216_updateptrs(info, total - residual);
 739 }
 740
 741 /**
 742  * fas216_transfer - Perform a DMA/PIO transfer off of/on to card
 743  * @info: interface from which device disconnected from
 744  *
 745  * Start a DMA/PIO transfer off of/on to card
 746  */
 747 static void fas216_transfer(FAS216_Info *info)
 748 {
 749         fasdmadir_t direction;
 750         fasdmatype_t dmatype;
 751
 752         fas216_log(info, LOG_BUFFER,
 753                    "starttransfer: buffer %p length 0x%06x reqlen 0x%06x",
 754                    info->scsi.SCp.ptr, info->scsi.SCp.this_residual,
 755                    info->scsi.SCp.phase);
 756
 757         if (!info->scsi.SCp.ptr) {
 758                 fas216_log(info, LOG_ERROR, "null buffer passed to "
 759                            "fas216_starttransfer");
 760                 print_SCp(&info->scsi.SCp, "SCp: ", "\n");
 761                 print_SCp(&info->SCpnt->SCp, "Cmnd SCp: ", "\n");
 762                 return;
 763         }
 764
 765         /*
 766          * If we have a synchronous transfer agreement in effect, we must
 767          * use DMA mode.  If we are using asynchronous transfers, we may
 768          * use DMA mode or PIO mode.
 769          */
 770         if (info->device[info->SCpnt->device->id].sof)
 771                 dmatype = fasdma_real_all;
 772         else
 773                 dmatype = fasdma_pio;
 774
 775         if (info->scsi.phase == PHASE_DATAOUT)
 776                 direction = DMA_OUT;
 777         else
 778                 direction = DMA_IN;
 779
 780         if (info->dma.setup)
 781                 dmatype = info->dma.setup(info->host, &info->scsi.SCp,
 782                                           direction, dmatype);
 783         info->dma.transfer_type = dmatype;
 784
 785         if (dmatype == fasdma_real_all)
 786                 fas216_set_stc(info, info->scsi.SCp.phase);
 787         else
 788                 fas216_set_stc(info, info->scsi.SCp.this_residual);
 789
 790         switch (dmatype) {
 791         case fasdma_pio:
 792                 fas216_log(info, LOG_BUFFER, "PIO transfer");
 793                 fas216_writeb(info, REG_SOF, 0);
 794                 fas216_writeb(info, REG_STP, info->scsi.async_stp);
 795                 fas216_cmd(info, CMD_TRANSFERINFO);
 796                 fas216_pio(info, direction);
 797                 break;
 798
 799         case fasdma_pseudo:
 800                 fas216_log(info, LOG_BUFFER, "pseudo transfer");
 801                 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
 802                 info->dma.pseudo(info->host, &info->scsi.SCp,
 803                                  direction, info->SCpnt->transfersize);
 804                 break;
 805
 806         case fasdma_real_block:
 807                 fas216_log(info, LOG_BUFFER, "block dma transfer");
 808                 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
 809                 break;
 810
 811         case fasdma_real_all:
 812                 fas216_log(info, LOG_BUFFER, "total dma transfer");
 813                 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
 814                 break;
 815
 816         default:
 817                 fas216_log(info, LOG_BUFFER | LOG_ERROR,
 818                            "invalid FAS216 DMA type");
 819                 break;
 820         }
 821 }
 822
 823 /**
 824  * fas216_stoptransfer - Stop a DMA transfer onto / off of the card
 825  * @info: interface from which device disconnected from
 826  *
 827  * Called when we switch away from DATA IN or DATA OUT phases.
 828  */
 829 static void fas216_stoptransfer(FAS216_Info *info)
 830 {
 831         fas216_checkmagic(info);
 832
 833         if (info->dma.transfer_type == fasdma_real_all ||
 834             info->dma.transfer_type == fasdma_real_block)
 835                 info->dma.stop(info->host, &info->scsi.SCp);
 836
 837         fas216_cleanuptransfer(info);
 838
 839         if (info->scsi.phase == PHASE_DATAIN) {
 840                 unsigned int fifo;
 841
 842                 /*
 843                  * If we were performing Data-In, then the FIFO counter
 844                  * contains the number of bytes not transferred via DMA
 845                  * from the on-board FIFO.  Read them manually.
 846                  */
 847                 fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
 848                 while (fifo && info->scsi.SCp.ptr) {
 849                         *info->scsi.SCp.ptr = fas216_readb(info, REG_FF);
 850                         fas216_updateptrs(info, 1);
 851                         fifo--;
 852                 }
 853         } else {
 854                 /*
 855                  * After a Data-Out phase, there may be unsent
 856                  * bytes left in the FIFO.  Flush them out.
 857                  */
 858                 fas216_cmd(info, CMD_FLUSHFIFO);
 859         }
 860 }
 861
 862 static void fas216_aborttransfer(FAS216_Info *info)
 863 {
 864         fas216_checkmagic(info);
 865
 866         if (info->dma.transfer_type == fasdma_real_all ||
 867             info->dma.transfer_type == fasdma_real_block)
 868                 info->dma.stop(info->host, &info->scsi.SCp);
 869
 870         info->dma.transfer_type = fasdma_none;
 871         fas216_cmd(info, CMD_FLUSHFIFO);
 872 }
 873
 874 static void fas216_kick(FAS216_Info *info);
 875
 876 /**
 877  * fas216_disconnected_intr - handle device disconnection
 878  * @info: interface from which device disconnected from
 879  *
 880  * Handle device disconnection
 881  */
 882 static void fas216_disconnect_intr(FAS216_Info *info)
 883 {
 884         unsigned long flags;
 885
 886         fas216_checkmagic(info);
 887
 888         fas216_log(info, LOG_CONNECT, "disconnect phase=%02x",
 889                    info->scsi.phase);
 890
 891         msgqueue_flush(&info->scsi.msgs);
 892
 893         switch (info->scsi.phase) {
 894         case PHASE_SELECTION:                   /* while selecting - no target          */
 895         case PHASE_SELSTEPS:
 896                 fas216_done(info, DID_NO_CONNECT);
 897                 break;
 898
 899         case PHASE_MSGIN_DISCONNECT:            /* message in - disconnecting           */
 900                 info->scsi.disconnectable = 1;
 901                 info->scsi.phase = PHASE_IDLE;
 902                 info->stats.disconnects += 1;
 903                 spin_lock_irqsave(&info->host_lock, flags);
 904                 if (info->scsi.phase == PHASE_IDLE)
 905                         fas216_kick(info);
 906                 spin_unlock_irqrestore(&info->host_lock, flags);
 907                 break;
 908
 909         case PHASE_DONE:                        /* at end of command - complete         */
 910                 fas216_done(info, DID_OK);
 911                 break;
 912
 913         case PHASE_MSGOUT:                      /* message out - possible ABORT message */
 914                 if (fas216_get_last_msg(info, info->scsi.msgin_fifo) == ABORT) {
 915                         info->scsi.aborting = 0;
 916                         fas216_done(info, DID_ABORT);
 917                         break;
 918                 }
 919                 fallthrough;
 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                 break;
1379
1380         default:
1381                 break;
1382         }
1383
1384         fas216_cmd(info, CMD_NOP);
1385
1386 #define STATE(st,ph) ((ph) << 3 | (st))
1387         /* This table describes the legal SCSI state transitions,
1388          * as described by the SCSI II spec.
1389          */
1390         switch (STATE(stat & STAT_BUSMASK, info->scsi.phase)) {
1391         case STATE(STAT_DATAIN, PHASE_SELSTEPS):/* Sel w/ steps -> Data In      */
1392         case STATE(STAT_DATAIN, PHASE_MSGOUT):  /* Message Out  -> Data In      */
1393         case STATE(STAT_DATAIN, PHASE_COMMAND): /* Command      -> Data In      */
1394         case STATE(STAT_DATAIN, PHASE_MSGIN):   /* Message In   -> Data In      */
1395                 info->scsi.phase = PHASE_DATAIN;
1396                 fas216_transfer(info);
1397                 return;
1398
1399         case STATE(STAT_DATAIN, PHASE_DATAIN):  /* Data In      -> Data In      */
1400         case STATE(STAT_DATAOUT, PHASE_DATAOUT):/* Data Out     -> Data Out     */
1401                 fas216_cleanuptransfer(info);
1402                 fas216_transfer(info);
1403                 return;
1404
1405         case STATE(STAT_DATAOUT, PHASE_SELSTEPS):/* Sel w/ steps-> Data Out     */
1406         case STATE(STAT_DATAOUT, PHASE_MSGOUT): /* Message Out  -> Data Out     */
1407         case STATE(STAT_DATAOUT, PHASE_COMMAND):/* Command      -> Data Out     */
1408         case STATE(STAT_DATAOUT, PHASE_MSGIN):  /* Message In   -> Data Out     */
1409                 fas216_cmd(info, CMD_FLUSHFIFO);
1410                 info->scsi.phase = PHASE_DATAOUT;
1411                 fas216_transfer(info);
1412                 return;
1413
1414         case STATE(STAT_STATUS, PHASE_DATAOUT): /* Data Out     -> Status       */
1415         case STATE(STAT_STATUS, PHASE_DATAIN):  /* Data In      -> Status       */
1416                 fas216_stoptransfer(info);
1417                 fallthrough;
1418
1419         case STATE(STAT_STATUS, PHASE_SELSTEPS):/* Sel w/ steps -> Status       */
1420         case STATE(STAT_STATUS, PHASE_MSGOUT):  /* Message Out  -> Status       */
1421         case STATE(STAT_STATUS, PHASE_COMMAND): /* Command      -> Status       */
1422         case STATE(STAT_STATUS, PHASE_MSGIN):   /* Message In   -> Status       */
1423                 fas216_cmd(info, CMD_INITCMDCOMPLETE);
1424                 info->scsi.phase = PHASE_STATUS;
1425                 return;
1426
1427         case STATE(STAT_MESGIN, PHASE_DATAOUT): /* Data Out     -> Message In   */
1428         case STATE(STAT_MESGIN, PHASE_DATAIN):  /* Data In      -> Message In   */
1429                 fas216_stoptransfer(info);
1430                 fallthrough;
1431
1432         case STATE(STAT_MESGIN, PHASE_COMMAND): /* Command      -> Message In   */
1433         case STATE(STAT_MESGIN, PHASE_SELSTEPS):/* Sel w/ steps -> Message In   */
1434         case STATE(STAT_MESGIN, PHASE_MSGOUT):  /* Message Out  -> Message In   */
1435                 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
1436                 fas216_cmd(info, CMD_FLUSHFIFO);
1437                 fas216_cmd(info, CMD_TRANSFERINFO);
1438                 info->scsi.phase = PHASE_MSGIN;
1439                 return;
1440
1441         case STATE(STAT_MESGIN, PHASE_MSGIN):
1442                 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
1443                 fas216_cmd(info, CMD_TRANSFERINFO);
1444                 return;
1445
1446         case STATE(STAT_COMMAND, PHASE_MSGOUT): /* Message Out  -> Command      */
1447         case STATE(STAT_COMMAND, PHASE_MSGIN):  /* Message In   -> Command      */
1448                 fas216_send_command(info);
1449                 info->scsi.phase = PHASE_COMMAND;
1450                 return;
1451
1452
1453         /*
1454          * Selection    -> Message Out
1455          */
1456         case STATE(STAT_MESGOUT, PHASE_SELECTION):
1457                 fas216_send_messageout(info, 1);
1458                 return;
1459
1460         /*
1461          * Message Out  -> Message Out
1462          */
1463         case STATE(STAT_MESGOUT, PHASE_SELSTEPS):
1464         case STATE(STAT_MESGOUT, PHASE_MSGOUT):
1465                 /*
1466                  * If we get another message out phase, this usually
1467                  * means some parity error occurred.  Resend complete
1468                  * set of messages.  If we have more than one byte to
1469                  * send, we need to assert ATN again.
1470                  */
1471                 if (info->device[info->SCpnt->device->id].parity_check) {
1472                         /*
1473                          * We were testing... good, the device
1474                          * supports parity checking.
1475                          */
1476                         info->device[info->SCpnt->device->id].parity_check = 0;
1477                         info->device[info->SCpnt->device->id].parity_enabled = 1;
1478                         fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
1479                 }
1480
1481                 if (msgqueue_msglength(&info->scsi.msgs) > 1)
1482                         fas216_cmd(info, CMD_SETATN);
1483                 fallthrough;
1484
1485         /*
1486          * Any          -> Message Out
1487          */
1488         case STATE(STAT_MESGOUT, PHASE_MSGOUT_EXPECT):
1489                 fas216_send_messageout(info, 0);
1490                 return;
1491
1492         /* Error recovery rules.
1493          *   These either attempt to abort or retry the operation.
1494          * TODO: we need more of these
1495          */
1496         case STATE(STAT_COMMAND, PHASE_COMMAND):/* Command      -> Command      */
1497                 /* error - we've sent out all the command bytes
1498                  * we have.
1499                  * NOTE: we need SAVE DATA POINTERS/RESTORE DATA POINTERS
1500                  * to include the command bytes sent for this to work
1501                  * correctly.
1502                  */
1503                 printk(KERN_ERR "scsi%d.%c: "
1504                         "target trying to receive more command bytes\n",
1505                         info->host->host_no, fas216_target(info));
1506                 fas216_cmd(info, CMD_SETATN);
1507                 fas216_set_stc(info, 15);
1508                 fas216_cmd(info, CMD_PADBYTES | CMD_WITHDMA);
1509                 msgqueue_flush(&info->scsi.msgs);
1510                 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1511                 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1512                 return;
1513         }
1514
1515         if (info->scsi.phase == PHASE_MSGIN_DISCONNECT) {
1516                 printk(KERN_ERR "scsi%d.%c: disconnect message received, but bus service %s?\n",
1517                         info->host->host_no, fas216_target(info),
1518                         fas216_bus_phase(stat));
1519                 msgqueue_flush(&info->scsi.msgs);
1520                 fas216_cmd(info, CMD_SETATN);
1521                 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1522                 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1523                 info->scsi.aborting = 1;
1524                 fas216_cmd(info, CMD_TRANSFERINFO);
1525                 return;
1526         }
1527         printk(KERN_ERR "scsi%d.%c: bus phase %s after %s?\n",
1528                 info->host->host_no, fas216_target(info),
1529                 fas216_bus_phase(stat),
1530                 fas216_drv_phase(info));
1531         print_debug_list();
1532         return;
1533
1534 bad_is:
1535         fas216_log(info, 0, "bus service at step %d?", is & IS_BITS);
1536         fas216_dumpstate(info);
1537         print_debug_list();
1538
1539         fas216_done(info, DID_ERROR);
1540 }
1541
1542 /**
1543  * fas216_funcdone_intr - handle a function done interrupt from FAS216 chip
1544  * @info: interface which caused function done interrupt
1545  * @stat: Status register contents
1546  * @is: SCSI Status register contents
1547  *
1548  * Handle a function done interrupt from FAS216 chip
1549  */
1550 static void fas216_funcdone_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
1551 {
1552         unsigned int fifo_len = fas216_readb(info, REG_CFIS) & CFIS_CF;
1553
1554         fas216_checkmagic(info);
1555
1556         fas216_log(info, LOG_FUNCTIONDONE,
1557                    "function done: stat=%02x is=%02x phase=%02x",
1558                    stat, is, info->scsi.phase);
1559
1560         switch (info->scsi.phase) {
1561         case PHASE_STATUS:                      /* status phase - read status and msg   */
1562                 if (fifo_len != 2) {
1563                         fas216_log(info, 0, "odd number of bytes in FIFO: %d", fifo_len);
1564                 }
1565                 /*
1566                  * Read status then message byte.
1567                  */
1568                 info->scsi.SCp.Status = fas216_readb(info, REG_FF);
1569                 info->scsi.SCp.Message = fas216_readb(info, REG_FF);
1570                 info->scsi.phase = PHASE_DONE;
1571                 fas216_cmd(info, CMD_MSGACCEPTED);
1572                 break;
1573
1574         case PHASE_IDLE:
1575         case PHASE_SELECTION:
1576         case PHASE_SELSTEPS:
1577                 break;
1578
1579         case PHASE_MSGIN:                       /* message in phase                     */
1580                 if ((stat & STAT_BUSMASK) == STAT_MESGIN) {
1581                         info->scsi.msgin_fifo = fifo_len;
1582                         fas216_message(info);
1583                         break;
1584                 }
1585                 fallthrough;
1586
1587         default:
1588                 fas216_log(info, 0, "internal phase %s for function done?"
1589                         "  What do I do with this?",
1590                         fas216_target(info), fas216_drv_phase(info));
1591         }
1592 }
1593
1594 static void fas216_bus_reset(FAS216_Info *info)
1595 {
1596         neg_t sync_state;
1597         int i;
1598
1599         msgqueue_flush(&info->scsi.msgs);
1600
1601         sync_state = neg_invalid;
1602
1603 #ifdef SCSI2_SYNC
1604         if (info->ifcfg.capabilities & (FASCAP_DMA|FASCAP_PSEUDODMA))
1605                 sync_state = neg_wait;
1606 #endif
1607
1608         info->scsi.phase = PHASE_IDLE;
1609         info->SCpnt = NULL; /* bug! */
1610         memset(&info->scsi.SCp, 0, sizeof(info->scsi.SCp));
1611
1612         for (i = 0; i < 8; i++) {
1613                 info->device[i].disconnect_ok   = info->ifcfg.disconnect_ok;
1614                 info->device[i].sync_state      = sync_state;
1615                 info->device[i].period          = info->ifcfg.asyncperiod / 4;
1616                 info->device[i].stp             = info->scsi.async_stp;
1617                 info->device[i].sof             = 0;
1618                 info->device[i].wide_xfer       = 0;
1619         }
1620
1621         info->rst_bus_status = 1;
1622         wake_up(&info->eh_wait);
1623 }
1624
1625 /**
1626  * fas216_intr - handle interrupts to progress a command
1627  * @info: interface to service
1628  *
1629  * Handle interrupts from the interface to progress a command
1630  */
1631 irqreturn_t fas216_intr(FAS216_Info *info)
1632 {
1633         unsigned char inst, is, stat;
1634         int handled = IRQ_NONE;
1635
1636         fas216_checkmagic(info);
1637
1638         stat = fas216_readb(info, REG_STAT);
1639         is = fas216_readb(info, REG_IS);
1640         inst = fas216_readb(info, REG_INST);
1641
1642         add_debug_list(stat, is, inst, info->scsi.phase);
1643
1644         if (stat & STAT_INT) {
1645                 if (inst & INST_BUSRESET) {
1646                         fas216_log(info, 0, "bus reset detected");
1647                         fas216_bus_reset(info);
1648                         scsi_report_bus_reset(info->host, 0);
1649                 } else if (inst & INST_ILLEGALCMD) {
1650                         fas216_log(info, LOG_ERROR, "illegal command given\n");
1651                         fas216_dumpstate(info);
1652                         print_debug_list();
1653                 } else if (inst & INST_DISCONNECT)
1654                         fas216_disconnect_intr(info);
1655                 else if (inst & INST_RESELECTED)        /* reselected                   */
1656                         fas216_reselected_intr(info);
1657                 else if (inst & INST_BUSSERVICE)        /* bus service request          */
1658                         fas216_busservice_intr(info, stat, is);
1659                 else if (inst & INST_FUNCDONE)          /* function done                */
1660                         fas216_funcdone_intr(info, stat, is);
1661                 else
1662                         fas216_log(info, 0, "unknown interrupt received:"
1663                                 " phase %s inst %02X is %02X stat %02X",
1664                                 fas216_drv_phase(info), inst, is, stat);
1665                 handled = IRQ_HANDLED;
1666         }
1667         return handled;
1668 }
1669
1670 static void __fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1671 {
1672         int tot_msglen;
1673
1674         /* following what the ESP driver says */
1675         fas216_set_stc(info, 0);
1676         fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
1677
1678         /* flush FIFO */
1679         fas216_cmd(info, CMD_FLUSHFIFO);
1680
1681         /* load bus-id and timeout */
1682         fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
1683         fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
1684
1685         /* synchronous transfers */
1686         fas216_set_sync(info, SCpnt->device->id);
1687
1688         tot_msglen = msgqueue_msglength(&info->scsi.msgs);
1689
1690 #ifdef DEBUG_MESSAGES
1691         {
1692                 struct message *msg;
1693                 int msgnr = 0, i;
1694
1695                 printk("scsi%d.%c: message out: ",
1696                         info->host->host_no, '0' + SCpnt->device->id);
1697                 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1698                         printk("{ ");
1699                         for (i = 0; i < msg->length; i++)
1700                                 printk("%02x ", msg->msg[i]);
1701                         printk("} ");
1702                 }
1703                 printk("\n");
1704         }
1705 #endif
1706
1707         if (tot_msglen == 1 || tot_msglen == 3) {
1708                 /*
1709                  * We have an easy message length to send...
1710                  */
1711                 struct message *msg;
1712                 int msgnr = 0, i;
1713
1714                 info->scsi.phase = PHASE_SELSTEPS;
1715
1716                 /* load message bytes */
1717                 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1718                         for (i = 0; i < msg->length; i++)
1719                                 fas216_writeb(info, REG_FF, msg->msg[i]);
1720                         msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
1721                 }
1722
1723                 /* load command */
1724                 for (i = 0; i < SCpnt->cmd_len; i++)
1725                         fas216_writeb(info, REG_FF, SCpnt->cmnd[i]);
1726
1727                 if (tot_msglen == 1)
1728                         fas216_cmd(info, CMD_SELECTATN);
1729                 else
1730                         fas216_cmd(info, CMD_SELECTATN3);
1731         } else {
1732                 /*
1733                  * We have an unusual number of message bytes to send.
1734                  *  Load first byte into fifo, and issue SELECT with ATN and
1735                  *  stop steps.
1736                  */
1737                 struct message *msg = msgqueue_getmsg(&info->scsi.msgs, 0);
1738
1739                 fas216_writeb(info, REG_FF, msg->msg[0]);
1740                 msg->fifo = 1;
1741
1742                 fas216_cmd(info, CMD_SELECTATNSTOP);
1743         }
1744 }
1745
1746 /*
1747  * Decide whether we need to perform a parity test on this device.
1748  * Can also be used to force parity error conditions during initial
1749  * information transfer phase (message out) for test purposes.
1750  */
1751 static int parity_test(FAS216_Info *info, int target)
1752 {
1753 #if 0
1754         if (target == 3) {
1755                 info->device[target].parity_check = 0;
1756                 return 1;
1757         }
1758 #endif
1759         return info->device[target].parity_check;
1760 }
1761
1762 static void fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1763 {
1764         int disconnect_ok;
1765
1766         /*
1767          * claim host busy
1768          */
1769         info->scsi.phase = PHASE_SELECTION;
1770         info->scsi.SCp = SCpnt->SCp;
1771         info->SCpnt = SCpnt;
1772         info->dma.transfer_type = fasdma_none;
1773
1774         if (parity_test(info, SCpnt->device->id))
1775                 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_PTE);
1776         else
1777                 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
1778
1779         /*
1780          * Don't allow request sense commands to disconnect.
1781          */
1782         disconnect_ok = SCpnt->cmnd[0] != REQUEST_SENSE &&
1783                         info->device[SCpnt->device->id].disconnect_ok;
1784
1785         /*
1786          * build outgoing message bytes
1787          */
1788         msgqueue_flush(&info->scsi.msgs);
1789         msgqueue_addmsg(&info->scsi.msgs, 1, IDENTIFY(disconnect_ok, SCpnt->device->lun));
1790
1791         /*
1792          * add tag message if required
1793          */
1794         if (SCpnt->tag)
1795                 msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG, SCpnt->tag);
1796
1797         do {
1798 #ifdef SCSI2_SYNC
1799                 if ((info->device[SCpnt->device->id].sync_state == neg_wait ||
1800                      info->device[SCpnt->device->id].sync_state == neg_complete) &&
1801                     (SCpnt->cmnd[0] == REQUEST_SENSE ||
1802                      SCpnt->cmnd[0] == INQUIRY)) {
1803                         info->device[SCpnt->device->id].sync_state = neg_inprogress;
1804                         msgqueue_addmsg(&info->scsi.msgs, 5,
1805                                         EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
1806                                         1000 / info->ifcfg.clockrate,
1807                                         info->ifcfg.sync_max_depth);
1808                         break;
1809                 }
1810 #endif
1811         } while (0);
1812
1813         __fas216_start_command(info, SCpnt);
1814 }
1815
1816 static void fas216_allocate_tag(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1817 {
1818 #ifdef SCSI2_TAG
1819         /*
1820          * tagged queuing - allocate a new tag to this command
1821          */
1822         if (SCpnt->device->simple_tags && SCpnt->cmnd[0] != REQUEST_SENSE &&
1823             SCpnt->cmnd[0] != INQUIRY) {
1824             SCpnt->device->current_tag += 1;
1825                 if (SCpnt->device->current_tag == 0)
1826                     SCpnt->device->current_tag = 1;
1827                         SCpnt->tag = SCpnt->device->current_tag;
1828         } else
1829 #endif
1830                 set_bit(SCpnt->device->id * 8 +
1831                         (u8)(SCpnt->device->lun & 0x7), info->busyluns);
1832
1833         info->stats.removes += 1;
1834         switch (SCpnt->cmnd[0]) {
1835         case WRITE_6:
1836         case WRITE_10:
1837         case WRITE_12:
1838                 info->stats.writes += 1;
1839                 break;
1840         case READ_6:
1841         case READ_10:
1842         case READ_12:
1843                 info->stats.reads += 1;
1844                 break;
1845         default:
1846                 info->stats.miscs += 1;
1847                 break;
1848         }
1849 }
1850
1851 static void fas216_do_bus_device_reset(FAS216_Info *info,
1852                                        struct scsi_cmnd *SCpnt)
1853 {
1854         struct message *msg;
1855
1856         /*
1857          * claim host busy
1858          */
1859         info->scsi.phase = PHASE_SELECTION;
1860         info->scsi.SCp = SCpnt->SCp;
1861         info->SCpnt = SCpnt;
1862         info->dma.transfer_type = fasdma_none;
1863
1864         fas216_log(info, LOG_ERROR, "sending bus device reset");
1865
1866         msgqueue_flush(&info->scsi.msgs);
1867         msgqueue_addmsg(&info->scsi.msgs, 1, BUS_DEVICE_RESET);
1868
1869         /* following what the ESP driver says */
1870         fas216_set_stc(info, 0);
1871         fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
1872
1873         /* flush FIFO */
1874         fas216_cmd(info, CMD_FLUSHFIFO);
1875
1876         /* load bus-id and timeout */
1877         fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
1878         fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
1879
1880         /* synchronous transfers */
1881         fas216_set_sync(info, SCpnt->device->id);
1882
1883         msg = msgqueue_getmsg(&info->scsi.msgs, 0);
1884
1885         fas216_writeb(info, REG_FF, BUS_DEVICE_RESET);
1886         msg->fifo = 1;
1887
1888         fas216_cmd(info, CMD_SELECTATNSTOP);
1889 }
1890
1891 /**
1892  * fas216_kick - kick a command to the interface
1893  * @info: our host interface to kick
1894  *
1895  * Kick a command to the interface, interface should be idle.
1896  * Notes: Interrupts are always disabled!
1897  */
1898 static void fas216_kick(FAS216_Info *info)
1899 {
1900         struct scsi_cmnd *SCpnt = NULL;
1901 #define TYPE_OTHER      0
1902 #define TYPE_RESET      1
1903 #define TYPE_QUEUE      2
1904         int where_from = TYPE_OTHER;
1905
1906         fas216_checkmagic(info);
1907
1908         /*
1909          * Obtain the next command to process.
1910          */
1911         do {
1912                 if (info->rstSCpnt) {
1913                         SCpnt = info->rstSCpnt;
1914                         /* don't remove it */
1915                         where_from = TYPE_RESET;
1916                         break;
1917                 }
1918
1919                 if (info->reqSCpnt) {
1920                         SCpnt = info->reqSCpnt;
1921                         info->reqSCpnt = NULL;
1922                         break;
1923                 }
1924
1925                 if (info->origSCpnt) {
1926                         SCpnt = info->origSCpnt;
1927                         info->origSCpnt = NULL;
1928                         break;
1929                 }
1930
1931                 /* retrieve next command */
1932                 if (!SCpnt) {
1933                         SCpnt = queue_remove_exclude(&info->queues.issue,
1934                                                      info->busyluns);
1935                         where_from = TYPE_QUEUE;
1936                         break;
1937                 }
1938         } while (0);
1939
1940         if (!SCpnt) {
1941                 /*
1942                  * no command pending, so enable reselection.
1943                  */
1944                 fas216_cmd(info, CMD_ENABLESEL);
1945                 return;
1946         }
1947
1948         /*
1949          * We're going to start a command, so disable reselection
1950          */
1951         fas216_cmd(info, CMD_DISABLESEL);
1952
1953         if (info->scsi.disconnectable && info->SCpnt) {
1954                 fas216_log(info, LOG_CONNECT,
1955                         "moved command for %d to disconnected queue",
1956                         info->SCpnt->device->id);
1957                 queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
1958                 info->scsi.disconnectable = 0;
1959                 info->SCpnt = NULL;
1960         }
1961
1962         fas216_log_command(info, LOG_CONNECT | LOG_MESSAGES, SCpnt,
1963                            "starting");
1964
1965         switch (where_from) {
1966         case TYPE_QUEUE:
1967                 fas216_allocate_tag(info, SCpnt);
1968                 fallthrough;
1969         case TYPE_OTHER:
1970                 fas216_start_command(info, SCpnt);
1971                 break;
1972         case TYPE_RESET:
1973                 fas216_do_bus_device_reset(info, SCpnt);
1974                 break;
1975         }
1976
1977         fas216_log(info, LOG_CONNECT, "select: data pointers [%p, %X]",
1978                 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1979
1980         /*
1981          * should now get either DISCONNECT or
1982          * (FUNCTION DONE with BUS SERVICE) interrupt
1983          */
1984 }
1985
1986 /*
1987  * Clean up from issuing a BUS DEVICE RESET message to a device.
1988  */
1989 static void fas216_devicereset_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
1990                                     unsigned int result)
1991 {
1992         fas216_log(info, LOG_ERROR, "fas216 device reset complete");
1993
1994         info->rstSCpnt = NULL;
1995         info->rst_dev_status = 1;
1996         wake_up(&info->eh_wait);
1997 }
1998
1999 /**
2000  * fas216_rq_sns_done - Finish processing automatic request sense command
2001  * @info: interface that completed
2002  * @SCpnt: command that completed
2003  * @result: driver byte of result
2004  *
2005  * Finish processing automatic request sense command
2006  */
2007 static void fas216_rq_sns_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
2008                                unsigned int result)
2009 {
2010         fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
2011                    "request sense complete, result=0x%04x%02x%02x",
2012                    result, SCpnt->SCp.Message, SCpnt->SCp.Status);
2013
2014         if (result != DID_OK || SCpnt->SCp.Status != SAM_STAT_GOOD)
2015                 /*
2016                  * Something went wrong.  Make sure that we don't
2017                  * have valid data in the sense buffer that could
2018                  * confuse the higher levels.
2019                  */
2020                 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2021 //printk("scsi%d.%c: sense buffer: ", info->host->host_no, '0' + SCpnt->device->id);
2022 //{ int i; for (i = 0; i < 32; i++) printk("%02x ", SCpnt->sense_buffer[i]); printk("\n"); }
2023         /*
2024          * Note that we don't set SCpnt->result, since that should
2025          * reflect the status of the command that we were asked by
2026          * the upper layers to process.  This would have been set
2027          * correctly by fas216_std_done.
2028          */
2029         scsi_eh_restore_cmnd(SCpnt, &info->ses);
2030         SCpnt->scsi_done(SCpnt);
2031 }
2032
2033 /**
2034  * fas216_std_done - finish processing of standard command
2035  * @info: interface that completed
2036  * @SCpnt: command that completed
2037  * @result: driver byte of result
2038  *
2039  * Finish processing of standard command
2040  */
2041 static void
2042 fas216_std_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, unsigned int result)
2043 {
2044         info->stats.fins += 1;
2045
2046         set_host_byte(SCpnt, result);
2047         if (result == DID_OK)
2048                 scsi_msg_to_host_byte(SCpnt, info->scsi.SCp.Message);
2049         set_status_byte(SCpnt, info->scsi.SCp.Status);
2050
2051         fas216_log_command(info, LOG_CONNECT, SCpnt,
2052                 "command complete, result=0x%08x", SCpnt->result);
2053
2054         /*
2055          * If the driver detected an error, we're all done.
2056          */
2057         if (get_host_byte(SCpnt) != DID_OK)
2058                 goto done;
2059
2060         /*
2061          * If the command returned CHECK_CONDITION or COMMAND_TERMINATED
2062          * status, request the sense information.
2063          */
2064         if (get_status_byte(SCpnt) == SAM_STAT_CHECK_CONDITION ||
2065             get_status_byte(SCpnt) == SAM_STAT_COMMAND_TERMINATED)
2066                 goto request_sense;
2067
2068         /*
2069          * If the command did not complete with GOOD status,
2070          * we are all done here.
2071          */
2072         if (get_status_byte(SCpnt) != SAM_STAT_GOOD)
2073                 goto done;
2074
2075         /*
2076          * We have successfully completed a command.  Make sure that
2077          * we do not have any buffers left to transfer.  The world
2078          * is not perfect, and we seem to occasionally hit this.
2079          * It can be indicative of a buggy driver, target or the upper
2080          * levels of the SCSI code.
2081          */
2082         if (info->scsi.SCp.ptr) {
2083                 switch (SCpnt->cmnd[0]) {
2084                 case INQUIRY:
2085                 case START_STOP:
2086                 case MODE_SENSE:
2087                         break;
2088
2089                 default:
2090                         scmd_printk(KERN_ERR, SCpnt,
2091                                     "incomplete data transfer detected: res=%08X ptr=%p len=%X\n",
2092                                     SCpnt->result, info->scsi.SCp.ptr,
2093                                     info->scsi.SCp.this_residual);
2094                         scsi_print_command(SCpnt);
2095                         set_host_byte(SCpnt, DID_ERROR);
2096                         goto request_sense;
2097                 }
2098         }
2099
2100 done:
2101         if (SCpnt->scsi_done) {
2102                 SCpnt->scsi_done(SCpnt);
2103                 return;
2104         }
2105
2106         panic("scsi%d.H: null scsi_done function in fas216_done",
2107                 info->host->host_no);
2108
2109
2110 request_sense:
2111         if (SCpnt->cmnd[0] == REQUEST_SENSE)
2112                 goto done;
2113
2114         scsi_eh_prep_cmnd(SCpnt, &info->ses, NULL, 0, ~0);
2115         fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
2116                           "requesting sense");
2117         init_SCp(SCpnt);
2118         SCpnt->SCp.Message = 0;
2119         SCpnt->SCp.Status = 0;
2120         SCpnt->tag = 0;
2121         SCpnt->host_scribble = (void *)fas216_rq_sns_done;
2122
2123         /*
2124          * Place this command into the high priority "request
2125          * sense" slot.  This will be the very next command
2126          * executed, unless a target connects to us.
2127          */
2128         if (info->reqSCpnt)
2129                 printk(KERN_WARNING "scsi%d.%c: losing request command\n",
2130                         info->host->host_no, '0' + SCpnt->device->id);
2131         info->reqSCpnt = SCpnt;
2132 }
2133
2134 /**
2135  * fas216_done - complete processing for current command
2136  * @info: interface that completed
2137  * @result: driver byte of result
2138  *
2139  * Complete processing for current command
2140  */
2141 static void fas216_done(FAS216_Info *info, unsigned int result)
2142 {
2143         void (*fn)(FAS216_Info *, struct scsi_cmnd *, unsigned int);
2144         struct scsi_cmnd *SCpnt;
2145         unsigned long flags;
2146
2147         fas216_checkmagic(info);
2148
2149         if (!info->SCpnt)
2150                 goto no_command;
2151
2152         SCpnt = info->SCpnt;
2153         info->SCpnt = NULL;
2154         info->scsi.phase = PHASE_IDLE;
2155
2156         if (info->scsi.aborting) {
2157                 fas216_log(info, 0, "uncaught abort - returning DID_ABORT");
2158                 result = DID_ABORT;
2159                 info->scsi.aborting = 0;
2160         }
2161
2162         /*
2163          * Sanity check the completion - if we have zero bytes left
2164          * to transfer, we should not have a valid pointer.
2165          */
2166         if (info->scsi.SCp.ptr && info->scsi.SCp.this_residual == 0) {
2167                 scmd_printk(KERN_INFO, SCpnt,
2168                             "zero bytes left to transfer, but buffer pointer still valid: ptr=%p len=%08x\n",
2169                             info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
2170                 info->scsi.SCp.ptr = NULL;
2171                 scsi_print_command(SCpnt);
2172         }
2173
2174         /*
2175          * Clear down this command as completed.  If we need to request
2176          * the sense information, fas216_kick will re-assert the busy
2177          * status.
2178          */
2179         info->device[SCpnt->device->id].parity_check = 0;
2180         clear_bit(SCpnt->device->id * 8 +
2181                   (u8)(SCpnt->device->lun & 0x7), info->busyluns);
2182
2183         fn = (void (*)(FAS216_Info *, struct scsi_cmnd *, unsigned int))SCpnt->host_scribble;
2184         fn(info, SCpnt, result);
2185
2186         if (info->scsi.irq) {
2187                 spin_lock_irqsave(&info->host_lock, flags);
2188                 if (info->scsi.phase == PHASE_IDLE)
2189                         fas216_kick(info);
2190                 spin_unlock_irqrestore(&info->host_lock, flags);
2191         }
2192         return;
2193
2194 no_command:
2195         panic("scsi%d.H: null command in fas216_done",
2196                 info->host->host_no);
2197 }
2198
2199 /**
2200  * fas216_queue_command - queue a command for adapter to process.
2201  * @SCpnt: Command to queue
2202  * @done: done function to call once command is complete
2203  *
2204  * Queue a command for adapter to process.
2205  * Returns: 0 on success, else error.
2206  * Notes: io_request_lock is held, interrupts are disabled.
2207  */
2208 static int fas216_queue_command_lck(struct scsi_cmnd *SCpnt,
2209                          void (*done)(struct scsi_cmnd *))
2210 {
2211         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2212         int result;
2213
2214         fas216_checkmagic(info);
2215
2216         fas216_log_command(info, LOG_CONNECT, SCpnt,
2217                            "received command (%p)", SCpnt);
2218
2219         SCpnt->scsi_done = done;
2220         SCpnt->host_scribble = (void *)fas216_std_done;
2221         SCpnt->result = 0;
2222
2223         init_SCp(SCpnt);
2224
2225         info->stats.queues += 1;
2226         SCpnt->tag = 0;
2227
2228         spin_lock(&info->host_lock);
2229
2230         /*
2231          * Add command into execute queue and let it complete under
2232          * whatever scheme we're using.
2233          */
2234         result = !queue_add_cmd_ordered(&info->queues.issue, SCpnt);
2235
2236         /*
2237          * If we successfully added the command,
2238          * kick the interface to get it moving.
2239          */
2240         if (result == 0 && info->scsi.phase == PHASE_IDLE)
2241                 fas216_kick(info);
2242         spin_unlock(&info->host_lock);
2243
2244         fas216_log_target(info, LOG_CONNECT, -1, "queue %s",
2245                 result ? "failure" : "success");
2246
2247         return result;
2248 }
2249
2250 DEF_SCSI_QCMD(fas216_queue_command)
2251
2252 /**
2253  * fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command
2254  * @SCpnt: Command to wake
2255  *
2256  * Trigger restart of a waiting thread in fas216_command
2257  */
2258 static void fas216_internal_done(struct scsi_cmnd *SCpnt)
2259 {
2260         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2261
2262         fas216_checkmagic(info);
2263
2264         info->internal_done = 1;
2265 }
2266
2267 /**
2268  * fas216_noqueue_command - process a command for the adapter.
2269  * @SCpnt: Command to queue
2270  *
2271  * Queue a command for adapter to process.
2272  * Returns: scsi result code.
2273  * Notes: io_request_lock is held, interrupts are disabled.
2274  */
2275 static int fas216_noqueue_command_lck(struct scsi_cmnd *SCpnt,
2276                            void (*done)(struct scsi_cmnd *))
2277 {
2278         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2279
2280         fas216_checkmagic(info);
2281
2282         /*
2283          * We should only be using this if we don't have an interrupt.
2284          * Provide some "incentive" to use the queueing code.
2285          */
2286         BUG_ON(info->scsi.irq);
2287
2288         info->internal_done = 0;
2289         fas216_queue_command_lck(SCpnt, fas216_internal_done);
2290
2291         /*
2292          * This wastes time, since we can't return until the command is
2293          * complete. We can't sleep either since we may get re-entered!
2294          * However, we must re-enable interrupts, or else we'll be
2295          * waiting forever.
2296          */
2297         spin_unlock_irq(info->host->host_lock);
2298
2299         while (!info->internal_done) {
2300                 /*
2301                  * If we don't have an IRQ, then we must poll the card for
2302                  * it's interrupt, and use that to call this driver's
2303                  * interrupt routine.  That way, we keep the command
2304                  * progressing.  Maybe we can add some intelligence here
2305                  * and go to sleep if we know that the device is going
2306                  * to be some time (eg, disconnected).
2307                  */
2308                 if (fas216_readb(info, REG_STAT) & STAT_INT) {
2309                         spin_lock_irq(info->host->host_lock);
2310                         fas216_intr(info);
2311                         spin_unlock_irq(info->host->host_lock);
2312                 }
2313         }
2314
2315         spin_lock_irq(info->host->host_lock);
2316
2317         done(SCpnt);
2318
2319         return 0;
2320 }
2321
2322 DEF_SCSI_QCMD(fas216_noqueue_command)
2323
2324 /*
2325  * Error handler timeout function.  Indicate that we timed out,
2326  * and wake up any error handler process so it can continue.
2327  */
2328 static void fas216_eh_timer(struct timer_list *t)
2329 {
2330         FAS216_Info *info = from_timer(info, t, eh_timer);
2331
2332         fas216_log(info, LOG_ERROR, "error handling timed out\n");
2333
2334         del_timer(&info->eh_timer);
2335
2336         if (info->rst_bus_status == 0)
2337                 info->rst_bus_status = -1;
2338         if (info->rst_dev_status == 0)
2339                 info->rst_dev_status = -1;
2340
2341         wake_up(&info->eh_wait);
2342 }
2343
2344 enum res_find {
2345         res_failed,             /* not found                    */
2346         res_success,            /* command on issue queue       */
2347         res_hw_abort            /* command on disconnected dev  */
2348 };
2349
2350 /**
2351  * fas216_do_abort - decide how to abort a command
2352  * @SCpnt: command to abort
2353  *
2354  * Decide how to abort a command.
2355  * Returns: abort status
2356  */
2357 static enum res_find fas216_find_command(FAS216_Info *info,
2358                                          struct scsi_cmnd *SCpnt)
2359 {
2360         enum res_find res = res_failed;
2361
2362         if (queue_remove_cmd(&info->queues.issue, SCpnt)) {
2363                 /*
2364                  * The command was on the issue queue, and has not been
2365                  * issued yet.  We can remove the command from the queue,
2366                  * and acknowledge the abort.  Neither the device nor the
2367                  * interface know about the command.
2368                  */
2369                 printk("on issue queue ");
2370
2371                 res = res_success;
2372         } else if (queue_remove_cmd(&info->queues.disconnected, SCpnt)) {
2373                 /*
2374                  * The command was on the disconnected queue.  We must
2375                  * reconnect with the device if possible, and send it
2376                  * an abort message.
2377                  */
2378                 printk("on disconnected queue ");
2379
2380                 res = res_hw_abort;
2381         } else if (info->SCpnt == SCpnt) {
2382                 printk("executing ");
2383
2384                 switch (info->scsi.phase) {
2385                 /*
2386                  * If the interface is idle, and the command is 'disconnectable',
2387                  * then it is the same as on the disconnected queue.
2388                  */
2389                 case PHASE_IDLE:
2390                         if (info->scsi.disconnectable) {
2391                                 info->scsi.disconnectable = 0;
2392                                 info->SCpnt = NULL;
2393                                 res = res_hw_abort;
2394                         }
2395                         break;
2396
2397                 default:
2398                         break;
2399                 }
2400         } else if (info->origSCpnt == SCpnt) {
2401                 /*
2402                  * The command will be executed next, but a command
2403                  * is currently using the interface.  This is similar to
2404                  * being on the issue queue, except the busylun bit has
2405                  * been set.
2406                  */
2407                 info->origSCpnt = NULL;
2408                 clear_bit(SCpnt->device->id * 8 +
2409                           (u8)(SCpnt->device->lun & 0x7), info->busyluns);
2410                 printk("waiting for execution ");
2411                 res = res_success;
2412         } else
2413                 printk("unknown ");
2414
2415         return res;
2416 }
2417
2418 /**
2419  * fas216_eh_abort - abort this command
2420  * @SCpnt: command to abort
2421  *
2422  * Abort this command.
2423  * Returns: FAILED if unable to abort
2424  * Notes: io_request_lock is taken, and irqs are disabled
2425  */
2426 int fas216_eh_abort(struct scsi_cmnd *SCpnt)
2427 {
2428         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2429         int result = FAILED;
2430
2431         fas216_checkmagic(info);
2432
2433         info->stats.aborts += 1;
2434
2435         scmd_printk(KERN_WARNING, SCpnt, "abort command\n");
2436
2437         print_debug_list();
2438         fas216_dumpstate(info);
2439
2440         switch (fas216_find_command(info, SCpnt)) {
2441         /*
2442          * We found the command, and cleared it out.  Either
2443          * the command is still known to be executing on the
2444          * target, or the busylun bit is not set.
2445          */
2446         case res_success:
2447                 scmd_printk(KERN_WARNING, SCpnt, "abort %p success\n", SCpnt);
2448                 result = SUCCESS;
2449                 break;
2450
2451         /*
2452          * We need to reconnect to the target and send it an
2453          * ABORT or ABORT_TAG message.  We can only do this
2454          * if the bus is free.
2455          */
2456         case res_hw_abort:
2457
2458         /*
2459          * We are unable to abort the command for some reason.
2460          */
2461         default:
2462         case res_failed:
2463                 scmd_printk(KERN_WARNING, SCpnt, "abort %p failed\n", SCpnt);
2464                 break;
2465         }
2466
2467         return result;
2468 }
2469
2470 /**
2471  * fas216_eh_device_reset - Reset the device associated with this command
2472  * @SCpnt: command specifing device to reset
2473  *
2474  * Reset the device associated with this command.
2475  * Returns: FAILED if unable to reset.
2476  * Notes: We won't be re-entered, so we'll only have one device
2477  * reset on the go at one time.
2478  */
2479 int fas216_eh_device_reset(struct scsi_cmnd *SCpnt)
2480 {
2481         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2482         unsigned long flags;
2483         int i, res = FAILED, target = SCpnt->device->id;
2484
2485         fas216_log(info, LOG_ERROR, "device reset for target %d", target);
2486
2487         spin_lock_irqsave(&info->host_lock, flags);
2488
2489         do {
2490                 /*
2491                  * If we are currently connected to a device, and
2492                  * it is the device we want to reset, there is
2493                  * nothing we can do here.  Chances are it is stuck,
2494                  * and we need a bus reset.
2495                  */
2496                 if (info->SCpnt && !info->scsi.disconnectable &&
2497                     info->SCpnt->device->id == SCpnt->device->id)
2498                         break;
2499
2500                 /*
2501                  * We're going to be resetting this device.  Remove
2502                  * all pending commands from the driver.  By doing
2503                  * so, we guarantee that we won't touch the command
2504                  * structures except to process the reset request.
2505                  */
2506                 queue_remove_all_target(&info->queues.issue, target);
2507                 queue_remove_all_target(&info->queues.disconnected, target);
2508                 if (info->origSCpnt && info->origSCpnt->device->id == target)
2509                         info->origSCpnt = NULL;
2510                 if (info->reqSCpnt && info->reqSCpnt->device->id == target)
2511                         info->reqSCpnt = NULL;
2512                 for (i = 0; i < 8; i++)
2513                         clear_bit(target * 8 + i, info->busyluns);
2514
2515                 /*
2516                  * Hijack this SCSI command structure to send
2517                  * a bus device reset message to this device.
2518                  */
2519                 SCpnt->host_scribble = (void *)fas216_devicereset_done;
2520
2521                 info->rst_dev_status = 0;
2522                 info->rstSCpnt = SCpnt;
2523
2524                 if (info->scsi.phase == PHASE_IDLE)
2525                         fas216_kick(info);
2526
2527                 mod_timer(&info->eh_timer, jiffies + 30 * HZ);
2528                 spin_unlock_irqrestore(&info->host_lock, flags);
2529
2530                 /*
2531                  * Wait up to 30 seconds for the reset to complete.
2532                  */
2533                 wait_event(info->eh_wait, info->rst_dev_status);
2534
2535                 del_timer_sync(&info->eh_timer);
2536                 spin_lock_irqsave(&info->host_lock, flags);
2537                 info->rstSCpnt = NULL;
2538
2539                 if (info->rst_dev_status == 1)
2540                         res = SUCCESS;
2541         } while (0);
2542
2543         SCpnt->host_scribble = NULL;
2544         spin_unlock_irqrestore(&info->host_lock, flags);
2545
2546         fas216_log(info, LOG_ERROR, "device reset complete: %s\n",
2547                    res == SUCCESS ? "success" : "failed");
2548
2549         return res;
2550 }
2551
2552 /**
2553  * fas216_eh_bus_reset - Reset the bus associated with the command
2554  * @SCpnt: command specifing bus to reset
2555  *
2556  * Reset the bus associated with the command.
2557  * Returns: FAILED if unable to reset.
2558  * Notes: Further commands are blocked.
2559  */
2560 int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt)
2561 {
2562         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2563         unsigned long flags;
2564         struct scsi_device *SDpnt;
2565
2566         fas216_checkmagic(info);
2567         fas216_log(info, LOG_ERROR, "resetting bus");
2568
2569         info->stats.bus_resets += 1;
2570
2571         spin_lock_irqsave(&info->host_lock, flags);
2572
2573         /*
2574          * Stop all activity on this interface.
2575          */
2576         fas216_aborttransfer(info);
2577         fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
2578
2579         /*
2580          * Clear any pending interrupts.
2581          */
2582         while (fas216_readb(info, REG_STAT) & STAT_INT)
2583                 fas216_readb(info, REG_INST);
2584
2585         info->rst_bus_status = 0;
2586
2587         /*
2588          * For each attached hard-reset device, clear out
2589          * all command structures.  Leave the running
2590          * command in place.
2591          */
2592         shost_for_each_device(SDpnt, info->host) {
2593                 int i;
2594
2595                 if (SDpnt->soft_reset)
2596                         continue;
2597
2598                 queue_remove_all_target(&info->queues.issue, SDpnt->id);
2599                 queue_remove_all_target(&info->queues.disconnected, SDpnt->id);
2600                 if (info->origSCpnt && info->origSCpnt->device->id == SDpnt->id)
2601                         info->origSCpnt = NULL;
2602                 if (info->reqSCpnt && info->reqSCpnt->device->id == SDpnt->id)
2603                         info->reqSCpnt = NULL;
2604                 info->SCpnt = NULL;
2605
2606                 for (i = 0; i < 8; i++)
2607                         clear_bit(SDpnt->id * 8 + i, info->busyluns);
2608         }
2609
2610         info->scsi.phase = PHASE_IDLE;
2611
2612         /*
2613          * Reset the SCSI bus.  Device cleanup happens in
2614          * the interrupt handler.
2615          */
2616         fas216_cmd(info, CMD_RESETSCSI);
2617
2618         mod_timer(&info->eh_timer, jiffies + HZ);
2619         spin_unlock_irqrestore(&info->host_lock, flags);
2620
2621         /*
2622          * Wait one second for the interrupt.
2623          */
2624         wait_event(info->eh_wait, info->rst_bus_status);
2625         del_timer_sync(&info->eh_timer);
2626
2627         fas216_log(info, LOG_ERROR, "bus reset complete: %s\n",
2628                    info->rst_bus_status == 1 ? "success" : "failed");
2629
2630         return info->rst_bus_status == 1 ? SUCCESS : FAILED;
2631 }
2632
2633 /**
2634  * fas216_init_chip - Initialise FAS216 state after reset
2635  * @info: state structure for interface
2636  *
2637  * Initialise FAS216 state after reset
2638  */
2639 static void fas216_init_chip(FAS216_Info *info)
2640 {
2641         unsigned int clock = ((info->ifcfg.clockrate - 1) / 5 + 1) & 7;
2642         fas216_writeb(info, REG_CLKF, clock);
2643         fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2644         fas216_writeb(info, REG_CNTL2, info->scsi.cfg[1]);
2645         fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
2646         fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
2647         fas216_writeb(info, REG_SOF, 0);
2648         fas216_writeb(info, REG_STP, info->scsi.async_stp);
2649         fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2650 }
2651
2652 /**
2653  * fas216_eh_host_reset - Reset the host associated with this command
2654  * @SCpnt: command specifing host to reset
2655  *
2656  * Reset the host associated with this command.
2657  * Returns: FAILED if unable to reset.
2658  * Notes: io_request_lock is taken, and irqs are disabled
2659  */
2660 int fas216_eh_host_reset(struct scsi_cmnd *SCpnt)
2661 {
2662         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2663
2664         spin_lock_irq(info->host->host_lock);
2665
2666         fas216_checkmagic(info);
2667
2668         fas216_log(info, LOG_ERROR, "resetting host");
2669
2670         /*
2671          * Reset the SCSI chip.
2672          */
2673         fas216_cmd(info, CMD_RESETCHIP);
2674
2675         /*
2676          * Ugly ugly ugly!
2677          * We need to release the host_lock and enable
2678          * IRQs if we sleep, but we must relock and disable
2679          * IRQs after the sleep.
2680          */
2681         spin_unlock_irq(info->host->host_lock);
2682         msleep(50 * 1000/100);
2683         spin_lock_irq(info->host->host_lock);
2684
2685         /*
2686          * Release the SCSI reset.
2687          */
2688         fas216_cmd(info, CMD_NOP);
2689
2690         fas216_init_chip(info);
2691
2692         spin_unlock_irq(info->host->host_lock);
2693         return SUCCESS;
2694 }
2695
2696 #define TYPE_UNKNOWN    0
2697 #define TYPE_NCR53C90   1
2698 #define TYPE_NCR53C90A  2
2699 #define TYPE_NCR53C9x   3
2700 #define TYPE_Am53CF94   4
2701 #define TYPE_EmFAS216   5
2702 #define TYPE_QLFAS216   6
2703
2704 static char *chip_types[] = {
2705         "unknown",
2706         "NS NCR53C90",
2707         "NS NCR53C90A",
2708         "NS NCR53C9x",
2709         "AMD Am53CF94",
2710         "Emulex FAS216",
2711         "QLogic FAS216"
2712 };
2713
2714 static int fas216_detect_type(FAS216_Info *info)
2715 {
2716         int family, rev;
2717
2718         /*
2719          * Reset the chip.
2720          */
2721         fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2722         udelay(50);
2723         fas216_writeb(info, REG_CMD, CMD_NOP);
2724
2725         /*
2726          * Check to see if control reg 2 is present.
2727          */
2728         fas216_writeb(info, REG_CNTL3, 0);
2729         fas216_writeb(info, REG_CNTL2, CNTL2_S2FE);
2730
2731         /*
2732          * If we are unable to read back control reg 2
2733          * correctly, it is not present, and we have a
2734          * NCR53C90.
2735          */
2736         if ((fas216_readb(info, REG_CNTL2) & (~0xe0)) != CNTL2_S2FE)
2737                 return TYPE_NCR53C90;
2738
2739         /*
2740          * Now, check control register 3
2741          */
2742         fas216_writeb(info, REG_CNTL2, 0);
2743         fas216_writeb(info, REG_CNTL3, 0);
2744         fas216_writeb(info, REG_CNTL3, 5);
2745
2746         /*
2747          * If we are unable to read the register back
2748          * correctly, we have a NCR53C90A
2749          */
2750         if (fas216_readb(info, REG_CNTL3) != 5)
2751                 return TYPE_NCR53C90A;
2752
2753         /*
2754          * Now read the ID from the chip.
2755          */
2756         fas216_writeb(info, REG_CNTL3, 0);
2757
2758         fas216_writeb(info, REG_CNTL3, CNTL3_ADIDCHK);
2759         fas216_writeb(info, REG_CNTL3, 0);
2760
2761         fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2762         udelay(50);
2763         fas216_writeb(info, REG_CMD, CMD_WITHDMA | CMD_NOP);
2764
2765         fas216_writeb(info, REG_CNTL2, CNTL2_ENF);
2766         fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2767         udelay(50);
2768         fas216_writeb(info, REG_CMD, CMD_NOP);
2769
2770         rev     = fas216_readb(info, REG_ID);
2771         family  = rev >> 3;
2772         rev    &= 7;
2773
2774         switch (family) {
2775         case 0x01:
2776                 if (rev == 4)
2777                         return TYPE_Am53CF94;
2778                 break;
2779
2780         case 0x02:
2781                 switch (rev) {
2782                 case 2:
2783                         return TYPE_EmFAS216;
2784                 case 3:
2785                         return TYPE_QLFAS216;
2786                 }
2787                 break;
2788
2789         default:
2790                 break;
2791         }
2792         printk("family %x rev %x\n", family, rev);
2793         return TYPE_NCR53C9x;
2794 }
2795
2796 /**
2797  * fas216_reset_state - Initialise driver internal state
2798  * @info: state to initialise
2799  *
2800  * Initialise driver internal state
2801  */
2802 static void fas216_reset_state(FAS216_Info *info)
2803 {
2804         int i;
2805
2806         fas216_checkmagic(info);
2807
2808         fas216_bus_reset(info);
2809
2810         /*
2811          * Clear out all stale info in our state structure
2812          */
2813         memset(info->busyluns, 0, sizeof(info->busyluns));
2814         info->scsi.disconnectable = 0;
2815         info->scsi.aborting = 0;
2816
2817         for (i = 0; i < 8; i++) {
2818                 info->device[i].parity_enabled  = 0;
2819                 info->device[i].parity_check    = 1;
2820         }
2821
2822         /*
2823          * Drain all commands on disconnected queue
2824          */
2825         while (queue_remove(&info->queues.disconnected) != NULL);
2826
2827         /*
2828          * Remove executing commands.
2829          */
2830         info->SCpnt     = NULL;
2831         info->reqSCpnt  = NULL;
2832         info->rstSCpnt  = NULL;
2833         info->origSCpnt = NULL;
2834 }
2835
2836 /**
2837  * fas216_init - initialise FAS/NCR/AMD SCSI structures.
2838  * @host: a driver-specific filled-out structure
2839  *
2840  * Initialise FAS/NCR/AMD SCSI structures.
2841  * Returns: 0 on success
2842  */
2843 int fas216_init(struct Scsi_Host *host)
2844 {
2845         FAS216_Info *info = (FAS216_Info *)host->hostdata;
2846
2847         info->magic_start    = MAGIC;
2848         info->magic_end      = MAGIC;
2849         info->host           = host;
2850         info->scsi.cfg[0]    = host->this_id | CNTL1_PERE;
2851         info->scsi.cfg[1]    = CNTL2_ENF | CNTL2_S2FE;
2852         info->scsi.cfg[2]    = info->ifcfg.cntl3 |
2853                                CNTL3_ADIDCHK | CNTL3_QTAG | CNTL3_G2CB | CNTL3_LBTM;
2854         info->scsi.async_stp = fas216_syncperiod(info, info->ifcfg.asyncperiod);
2855
2856         info->rst_dev_status = -1;
2857         info->rst_bus_status = -1;
2858         init_waitqueue_head(&info->eh_wait);
2859         timer_setup(&info->eh_timer, fas216_eh_timer, 0);
2860
2861         spin_lock_init(&info->host_lock);
2862
2863         memset(&info->stats, 0, sizeof(info->stats));
2864
2865         msgqueue_initialise(&info->scsi.msgs);
2866
2867         if (!queue_initialise(&info->queues.issue))
2868                 return -ENOMEM;
2869
2870         if (!queue_initialise(&info->queues.disconnected)) {
2871                 queue_free(&info->queues.issue);
2872                 return -ENOMEM;
2873         }
2874
2875         return 0;
2876 }
2877
2878 /**
2879  * fas216_add - initialise FAS/NCR/AMD SCSI ic.
2880  * @host: a driver-specific filled-out structure
2881  * @dev: parent device
2882  *
2883  * Initialise FAS/NCR/AMD SCSI ic.
2884  * Returns: 0 on success
2885  */
2886 int fas216_add(struct Scsi_Host *host, struct device *dev)
2887 {
2888         FAS216_Info *info = (FAS216_Info *)host->hostdata;
2889         int type, ret;
2890
2891         if (info->ifcfg.clockrate <= 10 || info->ifcfg.clockrate > 40) {
2892                 printk(KERN_CRIT "fas216: invalid clock rate %u MHz\n",
2893                         info->ifcfg.clockrate);
2894                 return -EINVAL;
2895         }
2896
2897         fas216_reset_state(info);
2898         type = fas216_detect_type(info);
2899         info->scsi.type = chip_types[type];
2900
2901         udelay(300);
2902
2903         /*
2904          * Initialise the chip correctly.
2905          */
2906         fas216_init_chip(info);
2907
2908         /*
2909          * Reset the SCSI bus.  We don't want to see
2910          * the resulting reset interrupt, so mask it
2911          * out.
2912          */
2913         fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_DISR);
2914         fas216_writeb(info, REG_CMD, CMD_RESETSCSI);
2915
2916         /*
2917          * scsi standard says wait 250ms
2918          */
2919         spin_unlock_irq(info->host->host_lock);
2920         msleep(100*1000/100);
2921         spin_lock_irq(info->host->host_lock);
2922
2923         fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2924         fas216_readb(info, REG_INST);
2925
2926         fas216_checkmagic(info);
2927
2928         ret = scsi_add_host(host, dev);
2929         if (ret)
2930                 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2931         else
2932                 scsi_scan_host(host);
2933
2934         return ret;
2935 }
2936
2937 void fas216_remove(struct Scsi_Host *host)
2938 {
2939         FAS216_Info *info = (FAS216_Info *)host->hostdata;
2940
2941         fas216_checkmagic(info);
2942         scsi_remove_host(host);
2943
2944         fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2945         scsi_host_put(host);
2946 }
2947
2948 /**
2949  * fas216_release - release all resources for FAS/NCR/AMD SCSI ic.
2950  * @host: a driver-specific filled-out structure
2951  *
2952  * release all resources and put everything to bed for FAS/NCR/AMD SCSI ic.
2953  */
2954 void fas216_release(struct Scsi_Host *host)
2955 {
2956         FAS216_Info *info = (FAS216_Info *)host->hostdata;
2957
2958         queue_free(&info->queues.disconnected);
2959         queue_free(&info->queues.issue);
2960 }
2961
2962 void fas216_print_host(FAS216_Info *info, struct seq_file *m)
2963 {
2964         seq_printf(m,
2965                         "\n"
2966                         "Chip    : %s\n"
2967                         " Address: 0x%p\n"
2968                         " IRQ    : %d\n"
2969                         " DMA    : %d\n",
2970                         info->scsi.type, info->scsi.io_base,
2971                         info->scsi.irq, info->scsi.dma);
2972 }
2973
2974 void fas216_print_stats(FAS216_Info *info, struct seq_file *m)
2975 {
2976         seq_printf(m, "\n"
2977                         "Command Statistics:\n"
2978                         " Queued     : %u\n"
2979                         " Issued     : %u\n"
2980                         " Completed  : %u\n"
2981                         " Reads      : %u\n"
2982                         " Writes     : %u\n"
2983                         " Others     : %u\n"
2984                         " Disconnects: %u\n"
2985                         " Aborts     : %u\n"
2986                         " Bus resets : %u\n"
2987                         " Host resets: %u\n",
2988                         info->stats.queues,      info->stats.removes,
2989                         info->stats.fins,        info->stats.reads,
2990                         info->stats.writes,      info->stats.miscs,
2991                         info->stats.disconnects, info->stats.aborts,
2992                         info->stats.bus_resets,  info->stats.host_resets);
2993 }
2994
2995 void fas216_print_devices(FAS216_Info *info, struct seq_file *m)
2996 {
2997         struct fas216_device *dev;
2998         struct scsi_device *scd;
2999
3000         seq_puts(m, "Device/Lun TaggedQ       Parity   Sync\n");
3001
3002         shost_for_each_device(scd, info->host) {
3003                 dev = &info->device[scd->id];
3004                 seq_printf(m, "     %d/%llu   ", scd->id, scd->lun);
3005                 if (scd->tagged_supported)
3006                         seq_printf(m, "%3sabled(%3d) ",
3007                                      scd->simple_tags ? "en" : "dis",
3008                                      scd->current_tag);
3009                 else
3010                         seq_puts(m, "unsupported   ");
3011
3012                 seq_printf(m, "%3sabled ", dev->parity_enabled ? "en" : "dis");
3013
3014                 if (dev->sof)
3015                         seq_printf(m, "offset %d, %d ns\n",
3016                                      dev->sof, dev->period * 4);
3017                 else
3018                         seq_puts(m, "async\n");
3019         }
3020 }
3021
3022 EXPORT_SYMBOL(fas216_init);
3023 EXPORT_SYMBOL(fas216_add);
3024 EXPORT_SYMBOL(fas216_queue_command);
3025 EXPORT_SYMBOL(fas216_noqueue_command);
3026 EXPORT_SYMBOL(fas216_intr);
3027 EXPORT_SYMBOL(fas216_remove);
3028 EXPORT_SYMBOL(fas216_release);
3029 EXPORT_SYMBOL(fas216_eh_abort);
3030 EXPORT_SYMBOL(fas216_eh_device_reset);
3031 EXPORT_SYMBOL(fas216_eh_bus_reset);
3032 EXPORT_SYMBOL(fas216_eh_host_reset);
3033 EXPORT_SYMBOL(fas216_print_host);
3034 EXPORT_SYMBOL(fas216_print_stats);
3035 EXPORT_SYMBOL(fas216_print_devices);
3036
3037 MODULE_AUTHOR("Russell King");
3038 MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core");
3039 MODULE_LICENSE("GPL");