linux/drivers/scsi/arm/fas216.c
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   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
  94static int level_mask = LOG_ERROR;
  95
  96module_param(level_mask, int, 0644);
  97
  98#ifndef MODULE
  99static 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
 141static 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
 147static 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
 153static 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
 174static 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
 182static 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
 226static 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
 247static 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
 259static 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
 281static 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
 289static void
 290fas216_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
 298static 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
 313static void
 314fas216_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
 333static 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
 349static struct { int stat, ssr, isr, ph; } ph_list[PH_SIZE];
 350static int ph_ptr;
 351
 352static 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
 362static struct { int command; void *from; } cmd_list[8];
 363static int cmd_ptr;
 364
 365static 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
 375static 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
 402static 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 */
 411static inline unsigned short
 412fas216_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 */
 444static 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 */
 468static 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 */
 513static 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                /* fall through */
 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 */
 627static 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 */
 667static 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
 682static 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
 689static 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 */
 703static 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 */
 747static 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 */
 829static 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
 862static 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
 874static 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 */
 882static 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                /* else, fall through */
 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 */
 937static void
 938fas216_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
1052static 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
1142unrecognised:
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         */
1154fas216_cmd(info, CMD_NOP);
1155fas216_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;
1160fas216_dumpstate(info);
1161}
1162
1163static 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
1180static 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
1207timedout:
1208        fas216_log(info, LOG_ERROR, "timed out waiting for message byte");
1209        return -1;
1210
1211unexpected_phase_change:
1212        fas216_log(info, LOG_ERROR, "unexpected phase change: status = %02x", stat);
1213        return -2;
1214
1215parity_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 */
1226static 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
1272parity_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 */
1287static 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 */
1312static 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 */
1349static void fas216_busservice_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
1350{
1351        fas216_checkmagic(info);
1352
1353        fas216_log(info, LOG_BUSSERVICE,
1354                   "bus service: stat=%02x is=%02x phase=%02x",
1355                   stat, is, info->scsi.phase);
1356
1357        switch (info->scsi.phase) {
1358        case PHASE_SELECTION:
1359                if ((is & IS_BITS) != IS_MSGBYTESENT)
1360                        goto bad_is;
1361                break;
1362
1363        case PHASE_SELSTEPS:
1364                switch (is & IS_BITS) {
1365                case IS_SELARB:
1366                case IS_MSGBYTESENT:
1367                        goto bad_is;
1368
1369                case IS_NOTCOMMAND:
1370                case IS_EARLYPHASE:
1371                        if ((stat & STAT_BUSMASK) == STAT_MESGIN)
1372                                break;
1373                        goto bad_is;
1374
1375                case IS_COMPLETE:
1376                        break;
1377                }
1378
1379        default:
1380                break;
1381        }
1382
1383        fas216_cmd(info, CMD_NOP);
1384
1385#define STATE(st,ph) ((ph) << 3 | (st))
1386        /* This table describes the legal SCSI state transitions,
1387         * as described by the SCSI II spec.
1388         */
1389        switch (STATE(stat & STAT_BUSMASK, info->scsi.phase)) {
1390        case STATE(STAT_DATAIN, PHASE_SELSTEPS):/* Sel w/ steps -> Data In      */
1391        case STATE(STAT_DATAIN, PHASE_MSGOUT):  /* Message Out  -> Data In      */
1392        case STATE(STAT_DATAIN, PHASE_COMMAND): /* Command      -> Data In      */
1393        case STATE(STAT_DATAIN, PHASE_MSGIN):   /* Message In   -> Data In      */
1394                info->scsi.phase = PHASE_DATAIN;
1395                fas216_transfer(info);
1396                return;
1397
1398        case STATE(STAT_DATAIN, PHASE_DATAIN):  /* Data In      -> Data In      */
1399        case STATE(STAT_DATAOUT, PHASE_DATAOUT):/* Data Out     -> Data Out     */
1400                fas216_cleanuptransfer(info);
1401                fas216_transfer(info);
1402                return;
1403
1404        case STATE(STAT_DATAOUT, PHASE_SELSTEPS):/* Sel w/ steps-> Data Out     */
1405        case STATE(STAT_DATAOUT, PHASE_MSGOUT): /* Message Out  -> Data Out     */
1406        case STATE(STAT_DATAOUT, PHASE_COMMAND):/* Command      -> Data Out     */
1407        case STATE(STAT_DATAOUT, PHASE_MSGIN):  /* Message In   -> Data Out     */
1408                fas216_cmd(info, CMD_FLUSHFIFO);
1409                info->scsi.phase = PHASE_DATAOUT;
1410                fas216_transfer(info);
1411                return;
1412
1413        case STATE(STAT_STATUS, PHASE_DATAOUT): /* Data Out     -> Status       */
1414        case STATE(STAT_STATUS, PHASE_DATAIN):  /* Data In      -> Status       */
1415                fas216_stoptransfer(info);
1416                /* fall through */
1417
1418        case STATE(STAT_STATUS, PHASE_SELSTEPS):/* Sel w/ steps -> Status       */
1419        case STATE(STAT_STATUS, PHASE_MSGOUT):  /* Message Out  -> Status       */
1420        case STATE(STAT_STATUS, PHASE_COMMAND): /* Command      -> Status       */
1421        case STATE(STAT_STATUS, PHASE_MSGIN):   /* Message In   -> Status       */
1422                fas216_cmd(info, CMD_INITCMDCOMPLETE);
1423                info->scsi.phase = PHASE_STATUS;
1424                return;
1425
1426        case STATE(STAT_MESGIN, PHASE_DATAOUT): /* Data Out     -> Message In   */
1427        case STATE(STAT_MESGIN, PHASE_DATAIN):  /* Data In      -> Message In   */
1428                fas216_stoptransfer(info);
1429                /* fall through */
1430
1431        case STATE(STAT_MESGIN, PHASE_COMMAND): /* Command      -> Message In   */
1432        case STATE(STAT_MESGIN, PHASE_SELSTEPS):/* Sel w/ steps -> Message In   */
1433        case STATE(STAT_MESGIN, PHASE_MSGOUT):  /* Message Out  -> Message In   */
1434                info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
1435                fas216_cmd(info, CMD_FLUSHFIFO);
1436                fas216_cmd(info, CMD_TRANSFERINFO);
1437                info->scsi.phase = PHASE_MSGIN;
1438                return;
1439
1440        case STATE(STAT_MESGIN, PHASE_MSGIN):
1441                info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
1442                fas216_cmd(info, CMD_TRANSFERINFO);
1443                return;
1444
1445        case STATE(STAT_COMMAND, PHASE_MSGOUT): /* Message Out  -> Command      */
1446        case STATE(STAT_COMMAND, PHASE_MSGIN):  /* Message In   -> Command      */
1447                fas216_send_command(info);
1448                info->scsi.phase = PHASE_COMMAND;
1449                return;
1450
1451
1452        /*
1453         * Selection    -> Message Out
1454         */
1455        case STATE(STAT_MESGOUT, PHASE_SELECTION):
1456                fas216_send_messageout(info, 1);
1457                return;
1458
1459        /*
1460         * Message Out  -> Message Out
1461         */
1462        case STATE(STAT_MESGOUT, PHASE_SELSTEPS):
1463        case STATE(STAT_MESGOUT, PHASE_MSGOUT):
1464                /*
1465                 * If we get another message out phase, this usually
1466                 * means some parity error occurred.  Resend complete
1467                 * set of messages.  If we have more than one byte to
1468                 * send, we need to assert ATN again.
1469                 */
1470                if (info->device[info->SCpnt->device->id].parity_check) {
1471                        /*
1472                         * We were testing... good, the device
1473                         * supports parity checking.
1474                         */
1475                        info->device[info->SCpnt->device->id].parity_check = 0;
1476                        info->device[info->SCpnt->device->id].parity_enabled = 1;
1477                        fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
1478                }
1479
1480                if (msgqueue_msglength(&info->scsi.msgs) > 1)
1481                        fas216_cmd(info, CMD_SETATN);
1482                /*FALLTHROUGH*/
1483
1484        /*
1485         * Any          -> Message Out
1486         */
1487        case STATE(STAT_MESGOUT, PHASE_MSGOUT_EXPECT):
1488                fas216_send_messageout(info, 0);
1489                return;
1490
1491        /* Error recovery rules.
1492         *   These either attempt to abort or retry the operation.
1493         * TODO: we need more of these
1494         */
1495        case STATE(STAT_COMMAND, PHASE_COMMAND):/* Command      -> Command      */
1496                /* error - we've sent out all the command bytes
1497                 * we have.
1498                 * NOTE: we need SAVE DATA POINTERS/RESTORE DATA POINTERS
1499                 * to include the command bytes sent for this to work
1500                 * correctly.
1501                 */
1502                printk(KERN_ERR "scsi%d.%c: "
1503                        "target trying to receive more command bytes\n",
1504                        info->host->host_no, fas216_target(info));
1505                fas216_cmd(info, CMD_SETATN);
1506                fas216_set_stc(info, 15);
1507                fas216_cmd(info, CMD_PADBYTES | CMD_WITHDMA);
1508                msgqueue_flush(&info->scsi.msgs);
1509                msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1510                info->scsi.phase = PHASE_MSGOUT_EXPECT;
1511                return;
1512        }
1513
1514        if (info->scsi.phase == PHASE_MSGIN_DISCONNECT) {
1515                printk(KERN_ERR "scsi%d.%c: disconnect message received, but bus service %s?\n",
1516                        info->host->host_no, fas216_target(info),
1517                        fas216_bus_phase(stat));
1518                msgqueue_flush(&info->scsi.msgs);
1519                fas216_cmd(info, CMD_SETATN);
1520                msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1521                info->scsi.phase = PHASE_MSGOUT_EXPECT;
1522                info->scsi.aborting = 1;
1523                fas216_cmd(info, CMD_TRANSFERINFO);
1524                return;
1525        }
1526        printk(KERN_ERR "scsi%d.%c: bus phase %s after %s?\n",
1527                info->host->host_no, fas216_target(info),
1528                fas216_bus_phase(stat),
1529                fas216_drv_phase(info));
1530        print_debug_list();
1531        return;
1532
1533bad_is:
1534        fas216_log(info, 0, "bus service at step %d?", is & IS_BITS);
1535        fas216_dumpstate(info);
1536        print_debug_list();
1537
1538        fas216_done(info, DID_ERROR);
1539}
1540
1541/**
1542 * fas216_funcdone_intr - handle a function done interrupt from FAS216 chip
1543 * @info: interface which caused function done interrupt
1544 * @stat: Status register contents
1545 * @is: SCSI Status register contents
1546 *
1547 * Handle a function done interrupt from FAS216 chip
1548 */
1549static void fas216_funcdone_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
1550{
1551        unsigned int fifo_len = fas216_readb(info, REG_CFIS) & CFIS_CF;
1552
1553        fas216_checkmagic(info);
1554
1555        fas216_log(info, LOG_FUNCTIONDONE,
1556                   "function done: stat=%02x is=%02x phase=%02x",
1557                   stat, is, info->scsi.phase);
1558
1559        switch (info->scsi.phase) {
1560        case PHASE_STATUS:                      /* status phase - read status and msg   */
1561                if (fifo_len != 2) {
1562                        fas216_log(info, 0, "odd number of bytes in FIFO: %d", fifo_len);
1563                }
1564                /*
1565                 * Read status then message byte.
1566                 */
1567                info->scsi.SCp.Status = fas216_readb(info, REG_FF);
1568                info->scsi.SCp.Message = fas216_readb(info, REG_FF);
1569                info->scsi.phase = PHASE_DONE;
1570                fas216_cmd(info, CMD_MSGACCEPTED);
1571                break;
1572
1573        case PHASE_IDLE:
1574        case PHASE_SELECTION:
1575        case PHASE_SELSTEPS:
1576                break;
1577
1578        case PHASE_MSGIN:                       /* message in phase                     */
1579                if ((stat & STAT_BUSMASK) == STAT_MESGIN) {
1580                        info->scsi.msgin_fifo = fifo_len;
1581                        fas216_message(info);
1582                        break;
1583                }
1584                /* else, fall through */
1585
1586        default:
1587                fas216_log(info, 0, "internal phase %s for function done?"
1588                        "  What do I do with this?",
1589                        fas216_target(info), fas216_drv_phase(info));
1590        }
1591}
1592
1593static void fas216_bus_reset(FAS216_Info *info)
1594{
1595        neg_t sync_state;
1596        int i;
1597
1598        msgqueue_flush(&info->scsi.msgs);
1599
1600        sync_state = neg_invalid;
1601
1602#ifdef SCSI2_SYNC
1603        if (info->ifcfg.capabilities & (FASCAP_DMA|FASCAP_PSEUDODMA))
1604                sync_state = neg_wait;
1605#endif
1606
1607        info->scsi.phase = PHASE_IDLE;
1608        info->SCpnt = NULL; /* bug! */
1609        memset(&info->scsi.SCp, 0, sizeof(info->scsi.SCp));
1610
1611        for (i = 0; i < 8; i++) {
1612                info->device[i].disconnect_ok   = info->ifcfg.disconnect_ok;
1613                info->device[i].sync_state      = sync_state;
1614                info->device[i].period          = info->ifcfg.asyncperiod / 4;
1615                info->device[i].stp             = info->scsi.async_stp;
1616                info->device[i].sof             = 0;
1617                info->device[i].wide_xfer       = 0;
1618        }
1619
1620        info->rst_bus_status = 1;
1621        wake_up(&info->eh_wait);
1622}
1623
1624/**
1625 * fas216_intr - handle interrupts to progress a command
1626 * @info: interface to service
1627 *
1628 * Handle interrupts from the interface to progress a command
1629 */
1630irqreturn_t fas216_intr(FAS216_Info *info)
1631{
1632        unsigned char inst, is, stat;
1633        int handled = IRQ_NONE;
1634
1635        fas216_checkmagic(info);
1636
1637        stat = fas216_readb(info, REG_STAT);
1638        is = fas216_readb(info, REG_IS);
1639        inst = fas216_readb(info, REG_INST);
1640
1641        add_debug_list(stat, is, inst, info->scsi.phase);
1642
1643        if (stat & STAT_INT) {
1644                if (inst & INST_BUSRESET) {
1645                        fas216_log(info, 0, "bus reset detected");
1646                        fas216_bus_reset(info);
1647                        scsi_report_bus_reset(info->host, 0);
1648                } else if (inst & INST_ILLEGALCMD) {
1649                        fas216_log(info, LOG_ERROR, "illegal command given\n");
1650                        fas216_dumpstate(info);
1651                        print_debug_list();
1652                } else if (inst & INST_DISCONNECT)
1653                        fas216_disconnect_intr(info);
1654                else if (inst & INST_RESELECTED)        /* reselected                   */
1655                        fas216_reselected_intr(info);
1656                else if (inst & INST_BUSSERVICE)        /* bus service request          */
1657                        fas216_busservice_intr(info, stat, is);
1658                else if (inst & INST_FUNCDONE)          /* function done                */
1659                        fas216_funcdone_intr(info, stat, is);
1660                else
1661                        fas216_log(info, 0, "unknown interrupt received:"
1662                                " phase %s inst %02X is %02X stat %02X",
1663                                fas216_drv_phase(info), inst, is, stat);
1664                handled = IRQ_HANDLED;
1665        }
1666        return handled;
1667}
1668
1669static void __fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1670{
1671        int tot_msglen;
1672
1673        /* following what the ESP driver says */
1674        fas216_set_stc(info, 0);
1675        fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
1676
1677        /* flush FIFO */
1678        fas216_cmd(info, CMD_FLUSHFIFO);
1679
1680        /* load bus-id and timeout */
1681        fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
1682        fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
1683
1684        /* synchronous transfers */
1685        fas216_set_sync(info, SCpnt->device->id);
1686
1687        tot_msglen = msgqueue_msglength(&info->scsi.msgs);
1688
1689#ifdef DEBUG_MESSAGES
1690        {
1691                struct message *msg;
1692                int msgnr = 0, i;
1693
1694                printk("scsi%d.%c: message out: ",
1695                        info->host->host_no, '0' + SCpnt->device->id);
1696                while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1697                        printk("{ ");
1698                        for (i = 0; i < msg->length; i++)
1699                                printk("%02x ", msg->msg[i]);
1700                        printk("} ");
1701                }
1702                printk("\n");
1703        }
1704#endif
1705
1706        if (tot_msglen == 1 || tot_msglen == 3) {
1707                /*
1708                 * We have an easy message length to send...
1709                 */
1710                struct message *msg;
1711                int msgnr = 0, i;
1712
1713                info->scsi.phase = PHASE_SELSTEPS;
1714
1715                /* load message bytes */
1716                while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1717                        for (i = 0; i < msg->length; i++)
1718                                fas216_writeb(info, REG_FF, msg->msg[i]);
1719                        msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
1720                }
1721
1722                /* load command */
1723                for (i = 0; i < SCpnt->cmd_len; i++)
1724                        fas216_writeb(info, REG_FF, SCpnt->cmnd[i]);
1725
1726                if (tot_msglen == 1)
1727                        fas216_cmd(info, CMD_SELECTATN);
1728                else
1729                        fas216_cmd(info, CMD_SELECTATN3);
1730        } else {
1731                /*
1732                 * We have an unusual number of message bytes to send.
1733                 *  Load first byte into fifo, and issue SELECT with ATN and
1734                 *  stop steps.
1735                 */
1736                struct message *msg = msgqueue_getmsg(&info->scsi.msgs, 0);
1737
1738                fas216_writeb(info, REG_FF, msg->msg[0]);
1739                msg->fifo = 1;
1740
1741                fas216_cmd(info, CMD_SELECTATNSTOP);
1742        }
1743}
1744
1745/*
1746 * Decide whether we need to perform a parity test on this device.
1747 * Can also be used to force parity error conditions during initial
1748 * information transfer phase (message out) for test purposes.
1749 */
1750static int parity_test(FAS216_Info *info, int target)
1751{
1752#if 0
1753        if (target == 3) {
1754                info->device[target].parity_check = 0;
1755                return 1;
1756        }
1757#endif
1758        return info->device[target].parity_check;
1759}
1760
1761static void fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1762{
1763        int disconnect_ok;
1764
1765        /*
1766         * claim host busy
1767         */
1768        info->scsi.phase = PHASE_SELECTION;
1769        info->scsi.SCp = SCpnt->SCp;
1770        info->SCpnt = SCpnt;
1771        info->dma.transfer_type = fasdma_none;
1772
1773        if (parity_test(info, SCpnt->device->id))
1774                fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_PTE);
1775        else
1776                fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
1777
1778        /*
1779         * Don't allow request sense commands to disconnect.
1780         */
1781        disconnect_ok = SCpnt->cmnd[0] != REQUEST_SENSE &&
1782                        info->device[SCpnt->device->id].disconnect_ok;
1783
1784        /*
1785         * build outgoing message bytes
1786         */
1787        msgqueue_flush(&info->scsi.msgs);
1788        msgqueue_addmsg(&info->scsi.msgs, 1, IDENTIFY(disconnect_ok, SCpnt->device->lun));
1789
1790        /*
1791         * add tag message if required
1792         */
1793        if (SCpnt->tag)
1794                msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG, SCpnt->tag);
1795
1796        do {
1797#ifdef SCSI2_SYNC
1798                if ((info->device[SCpnt->device->id].sync_state == neg_wait ||
1799                     info->device[SCpnt->device->id].sync_state == neg_complete) &&
1800                    (SCpnt->cmnd[0] == REQUEST_SENSE ||
1801                     SCpnt->cmnd[0] == INQUIRY)) {
1802                        info->device[SCpnt->device->id].sync_state = neg_inprogress;
1803                        msgqueue_addmsg(&info->scsi.msgs, 5,
1804                                        EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
1805                                        1000 / info->ifcfg.clockrate,
1806                                        info->ifcfg.sync_max_depth);
1807                        break;
1808                }
1809#endif
1810        } while (0);
1811
1812        __fas216_start_command(info, SCpnt);
1813}
1814
1815static void fas216_allocate_tag(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1816{
1817#ifdef SCSI2_TAG
1818        /*
1819         * tagged queuing - allocate a new tag to this command
1820         */
1821        if (SCpnt->device->simple_tags && SCpnt->cmnd[0] != REQUEST_SENSE &&
1822            SCpnt->cmnd[0] != INQUIRY) {
1823            SCpnt->device->current_tag += 1;
1824                if (SCpnt->device->current_tag == 0)
1825                    SCpnt->device->current_tag = 1;
1826                        SCpnt->tag = SCpnt->device->current_tag;
1827        } else
1828#endif
1829                set_bit(SCpnt->device->id * 8 +
1830                        (u8)(SCpnt->device->lun & 0x7), info->busyluns);
1831
1832        info->stats.removes += 1;
1833        switch (SCpnt->cmnd[0]) {
1834        case WRITE_6:
1835        case WRITE_10:
1836        case WRITE_12:
1837                info->stats.writes += 1;
1838                break;
1839        case READ_6:
1840        case READ_10:
1841        case READ_12:
1842                info->stats.reads += 1;
1843                break;
1844        default:
1845                info->stats.miscs += 1;
1846                break;
1847        }
1848}
1849
1850static void fas216_do_bus_device_reset(FAS216_Info *info,
1851                                       struct scsi_cmnd *SCpnt)
1852{
1853        struct message *msg;
1854
1855        /*
1856         * claim host busy
1857         */
1858        info->scsi.phase = PHASE_SELECTION;
1859        info->scsi.SCp = SCpnt->SCp;
1860        info->SCpnt = SCpnt;
1861        info->dma.transfer_type = fasdma_none;
1862
1863        fas216_log(info, LOG_ERROR, "sending bus device reset");
1864
1865        msgqueue_flush(&info->scsi.msgs);
1866        msgqueue_addmsg(&info->scsi.msgs, 1, BUS_DEVICE_RESET);
1867
1868        /* following what the ESP driver says */
1869        fas216_set_stc(info, 0);
1870        fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
1871
1872        /* flush FIFO */
1873        fas216_cmd(info, CMD_FLUSHFIFO);
1874
1875        /* load bus-id and timeout */
1876        fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
1877        fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
1878
1879        /* synchronous transfers */
1880        fas216_set_sync(info, SCpnt->device->id);
1881
1882        msg = msgqueue_getmsg(&info->scsi.msgs, 0);
1883
1884        fas216_writeb(info, REG_FF, BUS_DEVICE_RESET);
1885        msg->fifo = 1;
1886
1887        fas216_cmd(info, CMD_SELECTATNSTOP);
1888}
1889
1890/**
1891 * fas216_kick - kick a command to the interface
1892 * @info: our host interface to kick
1893 *
1894 * Kick a command to the interface, interface should be idle.
1895 * Notes: Interrupts are always disabled!
1896 */
1897static void fas216_kick(FAS216_Info *info)
1898{
1899        struct scsi_cmnd *SCpnt = NULL;
1900#define TYPE_OTHER      0
1901#define TYPE_RESET      1
1902#define TYPE_QUEUE      2
1903        int where_from = TYPE_OTHER;
1904
1905        fas216_checkmagic(info);
1906
1907        /*
1908         * Obtain the next command to process.
1909         */
1910        do {
1911                if (info->rstSCpnt) {
1912                        SCpnt = info->rstSCpnt;
1913                        /* don't remove it */
1914                        where_from = TYPE_RESET;
1915                        break;
1916                }
1917
1918                if (info->reqSCpnt) {
1919                        SCpnt = info->reqSCpnt;
1920                        info->reqSCpnt = NULL;
1921                        break;
1922                }
1923
1924                if (info->origSCpnt) {
1925                        SCpnt = info->origSCpnt;
1926                        info->origSCpnt = NULL;
1927                        break;
1928                }
1929
1930                /* retrieve next command */
1931                if (!SCpnt) {
1932                        SCpnt = queue_remove_exclude(&info->queues.issue,
1933                                                     info->busyluns);
1934                        where_from = TYPE_QUEUE;
1935                        break;
1936                }
1937        } while (0);
1938
1939        if (!SCpnt) {
1940                /*
1941                 * no command pending, so enable reselection.
1942                 */
1943                fas216_cmd(info, CMD_ENABLESEL);
1944                return;
1945        }
1946
1947        /*
1948         * We're going to start a command, so disable reselection
1949         */
1950        fas216_cmd(info, CMD_DISABLESEL);
1951
1952        if (info->scsi.disconnectable && info->SCpnt) {
1953                fas216_log(info, LOG_CONNECT,
1954                        "moved command for %d to disconnected queue",
1955                        info->SCpnt->device->id);
1956                queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
1957                info->scsi.disconnectable = 0;
1958                info->SCpnt = NULL;
1959        }
1960
1961        fas216_log_command(info, LOG_CONNECT | LOG_MESSAGES, SCpnt,
1962                           "starting");
1963
1964        switch (where_from) {
1965        case TYPE_QUEUE:
1966                fas216_allocate_tag(info, SCpnt);
1967                /* fall through */
1968        case TYPE_OTHER:
1969                fas216_start_command(info, SCpnt);
1970                break;
1971        case TYPE_RESET:
1972                fas216_do_bus_device_reset(info, SCpnt);
1973                break;
1974        }
1975
1976        fas216_log(info, LOG_CONNECT, "select: data pointers [%p, %X]",
1977                info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1978
1979        /*
1980         * should now get either DISCONNECT or
1981         * (FUNCTION DONE with BUS SERVICE) interrupt
1982         */
1983}
1984
1985/*
1986 * Clean up from issuing a BUS DEVICE RESET message to a device.
1987 */
1988static void fas216_devicereset_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
1989                                    unsigned int result)
1990{
1991        fas216_log(info, LOG_ERROR, "fas216 device reset complete");
1992
1993        info->rstSCpnt = NULL;
1994        info->rst_dev_status = 1;
1995        wake_up(&info->eh_wait);
1996}
1997
1998/**
1999 * fas216_rq_sns_done - Finish processing automatic request sense command
2000 * @info: interface that completed
2001 * @SCpnt: command that completed
2002 * @result: driver byte of result
2003 *
2004 * Finish processing automatic request sense command
2005 */
2006static void fas216_rq_sns_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
2007                               unsigned int result)
2008{
2009        fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
2010                   "request sense complete, result=0x%04x%02x%02x",
2011                   result, SCpnt->SCp.Message, SCpnt->SCp.Status);
2012
2013        if (result != DID_OK || SCpnt->SCp.Status != GOOD)
2014                /*
2015                 * Something went wrong.  Make sure that we don't
2016                 * have valid data in the sense buffer that could
2017                 * confuse the higher levels.
2018                 */
2019                memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2020//printk("scsi%d.%c: sense buffer: ", info->host->host_no, '0' + SCpnt->device->id);
2021//{ int i; for (i = 0; i < 32; i++) printk("%02x ", SCpnt->sense_buffer[i]); printk("\n"); }
2022        /*
2023         * Note that we don't set SCpnt->result, since that should
2024         * reflect the status of the command that we were asked by
2025         * the upper layers to process.  This would have been set
2026         * correctly by fas216_std_done.
2027         */
2028        scsi_eh_restore_cmnd(SCpnt, &info->ses);
2029        SCpnt->scsi_done(SCpnt);
2030}
2031
2032/**
2033 * fas216_std_done - finish processing of standard command
2034 * @info: interface that completed
2035 * @SCpnt: command that completed
2036 * @result: driver byte of result
2037 *
2038 * Finish processing of standard command
2039 */
2040static void
2041fas216_std_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, unsigned int result)
2042{
2043        info->stats.fins += 1;
2044
2045        SCpnt->result = result << 16 | info->scsi.SCp.Message << 8 |
2046                        info->scsi.SCp.Status;
2047
2048        fas216_log_command(info, LOG_CONNECT, SCpnt,
2049                "command complete, result=0x%08x", SCpnt->result);
2050
2051        /*
2052         * If the driver detected an error, we're all done.
2053         */
2054        if (host_byte(SCpnt->result) != DID_OK ||
2055            msg_byte(SCpnt->result) != COMMAND_COMPLETE)
2056                goto done;
2057
2058        /*
2059         * If the command returned CHECK_CONDITION or COMMAND_TERMINATED
2060         * status, request the sense information.
2061         */
2062        if (status_byte(SCpnt->result) == CHECK_CONDITION ||
2063            status_byte(SCpnt->result) == COMMAND_TERMINATED)
2064                goto request_sense;
2065
2066        /*
2067         * If the command did not complete with GOOD status,
2068         * we are all done here.
2069         */
2070        if (status_byte(SCpnt->result) != GOOD)
2071                goto done;
2072
2073        /*
2074         * We have successfully completed a command.  Make sure that
2075         * we do not have any buffers left to transfer.  The world
2076         * is not perfect, and we seem to occasionally hit this.
2077         * It can be indicative of a buggy driver, target or the upper
2078         * levels of the SCSI code.
2079         */
2080        if (info->scsi.SCp.ptr) {
2081                switch (SCpnt->cmnd[0]) {
2082                case INQUIRY:
2083                case START_STOP:
2084                case MODE_SENSE:
2085                        break;
2086
2087                default:
2088                        scmd_printk(KERN_ERR, SCpnt,
2089                                    "incomplete data transfer detected: res=%08X ptr=%p len=%X\n",
2090                                    SCpnt->result, info->scsi.SCp.ptr,
2091                                    info->scsi.SCp.this_residual);
2092                        scsi_print_command(SCpnt);
2093                        set_host_byte(SCpnt, DID_ERROR);
2094                        goto request_sense;
2095                }
2096        }
2097
2098done:
2099        if (SCpnt->scsi_done) {
2100                SCpnt->scsi_done(SCpnt);
2101                return;
2102        }
2103
2104        panic("scsi%d.H: null scsi_done function in fas216_done",
2105                info->host->host_no);
2106
2107
2108request_sense:
2109        if (SCpnt->cmnd[0] == REQUEST_SENSE)
2110                goto done;
2111
2112        scsi_eh_prep_cmnd(SCpnt, &info->ses, NULL, 0, ~0);
2113        fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
2114                          "requesting sense");
2115        init_SCp(SCpnt);
2116        SCpnt->SCp.Message = 0;
2117        SCpnt->SCp.Status = 0;
2118        SCpnt->tag = 0;
2119        SCpnt->host_scribble = (void *)fas216_rq_sns_done;
2120
2121        /*
2122         * Place this command into the high priority "request
2123         * sense" slot.  This will be the very next command
2124         * executed, unless a target connects to us.
2125         */
2126        if (info->reqSCpnt)
2127                printk(KERN_WARNING "scsi%d.%c: losing request command\n",
2128                        info->host->host_no, '0' + SCpnt->device->id);
2129        info->reqSCpnt = SCpnt;
2130}
2131
2132/**
2133 * fas216_done - complete processing for current command
2134 * @info: interface that completed
2135 * @result: driver byte of result
2136 *
2137 * Complete processing for current command
2138 */
2139static void fas216_done(FAS216_Info *info, unsigned int result)
2140{
2141        void (*fn)(FAS216_Info *, struct scsi_cmnd *, unsigned int);
2142        struct scsi_cmnd *SCpnt;
2143        unsigned long flags;
2144
2145        fas216_checkmagic(info);
2146
2147        if (!info->SCpnt)
2148                goto no_command;
2149
2150        SCpnt = info->SCpnt;
2151        info->SCpnt = NULL;
2152        info->scsi.phase = PHASE_IDLE;
2153
2154        if (info->scsi.aborting) {
2155                fas216_log(info, 0, "uncaught abort - returning DID_ABORT");
2156                result = DID_ABORT;
2157                info->scsi.aborting = 0;
2158        }
2159
2160        /*
2161         * Sanity check the completion - if we have zero bytes left
2162         * to transfer, we should not have a valid pointer.
2163         */
2164        if (info->scsi.SCp.ptr && info->scsi.SCp.this_residual == 0) {
2165                scmd_printk(KERN_INFO, SCpnt,
2166                            "zero bytes left to transfer, but buffer pointer still valid: ptr=%p len=%08x\n",
2167                            info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
2168                info->scsi.SCp.ptr = NULL;
2169                scsi_print_command(SCpnt);
2170        }
2171
2172        /*
2173         * Clear down this command as completed.  If we need to request
2174         * the sense information, fas216_kick will re-assert the busy
2175         * status.
2176         */
2177        info->device[SCpnt->device->id].parity_check = 0;
2178        clear_bit(SCpnt->device->id * 8 +
2179                  (u8)(SCpnt->device->lun & 0x7), info->busyluns);
2180
2181        fn = (void (*)(FAS216_Info *, struct scsi_cmnd *, unsigned int))SCpnt->host_scribble;
2182        fn(info, SCpnt, result);
2183
2184        if (info->scsi.irq) {
2185                spin_lock_irqsave(&info->host_lock, flags);
2186                if (info->scsi.phase == PHASE_IDLE)
2187                        fas216_kick(info);
2188                spin_unlock_irqrestore(&info->host_lock, flags);
2189        }
2190        return;
2191
2192no_command:
2193        panic("scsi%d.H: null command in fas216_done",
2194                info->host->host_no);
2195}
2196
2197/**
2198 * fas216_queue_command - queue a command for adapter to process.
2199 * @SCpnt: Command to queue
2200 * @done: done function to call once command is complete
2201 *
2202 * Queue a command for adapter to process.
2203 * Returns: 0 on success, else error.
2204 * Notes: io_request_lock is held, interrupts are disabled.
2205 */
2206static int fas216_queue_command_lck(struct scsi_cmnd *SCpnt,
2207                         void (*done)(struct scsi_cmnd *))
2208{
2209        FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2210        int result;
2211
2212        fas216_checkmagic(info);
2213
2214        fas216_log_command(info, LOG_CONNECT, SCpnt,
2215                           "received command (%p)", SCpnt);
2216
2217        SCpnt->scsi_done = done;
2218        SCpnt->host_scribble = (void *)fas216_std_done;
2219        SCpnt->result = 0;
2220
2221        init_SCp(SCpnt);
2222
2223        info->stats.queues += 1;
2224        SCpnt->tag = 0;
2225
2226        spin_lock(&info->host_lock);
2227
2228        /*
2229         * Add command into execute queue and let it complete under
2230         * whatever scheme we're using.
2231         */
2232        result = !queue_add_cmd_ordered(&info->queues.issue, SCpnt);
2233
2234        /*
2235         * If we successfully added the command,
2236         * kick the interface to get it moving.
2237         */
2238        if (result == 0 && info->scsi.phase == PHASE_IDLE)
2239                fas216_kick(info);
2240        spin_unlock(&info->host_lock);
2241
2242        fas216_log_target(info, LOG_CONNECT, -1, "queue %s",
2243                result ? "failure" : "success");
2244
2245        return result;
2246}
2247
2248DEF_SCSI_QCMD(fas216_queue_command)
2249
2250/**
2251 * fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command
2252 * @SCpnt: Command to wake
2253 *
2254 * Trigger restart of a waiting thread in fas216_command
2255 */
2256static void fas216_internal_done(struct scsi_cmnd *SCpnt)
2257{
2258        FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2259
2260        fas216_checkmagic(info);
2261
2262        info->internal_done = 1;
2263}
2264
2265/**
2266 * fas216_noqueue_command - process a command for the adapter.
2267 * @SCpnt: Command to queue
2268 *
2269 * Queue a command for adapter to process.
2270 * Returns: scsi result code.
2271 * Notes: io_request_lock is held, interrupts are disabled.
2272 */
2273static int fas216_noqueue_command_lck(struct scsi_cmnd *SCpnt,
2274                           void (*done)(struct scsi_cmnd *))
2275{
2276        FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2277
2278        fas216_checkmagic(info);
2279
2280        /*
2281         * We should only be using this if we don't have an interrupt.
2282         * Provide some "incentive" to use the queueing code.
2283         */
2284        BUG_ON(info->scsi.irq);
2285
2286        info->internal_done = 0;
2287        fas216_queue_command_lck(SCpnt, fas216_internal_done);
2288
2289        /*
2290         * This wastes time, since we can't return until the command is
2291         * complete. We can't sleep either since we may get re-entered!
2292         * However, we must re-enable interrupts, or else we'll be
2293         * waiting forever.
2294         */
2295        spin_unlock_irq(info->host->host_lock);
2296
2297        while (!info->internal_done) {
2298                /*
2299                 * If we don't have an IRQ, then we must poll the card for
2300                 * it's interrupt, and use that to call this driver's
2301                 * interrupt routine.  That way, we keep the command
2302                 * progressing.  Maybe we can add some intelligence here
2303                 * and go to sleep if we know that the device is going
2304                 * to be some time (eg, disconnected).
2305                 */
2306                if (fas216_readb(info, REG_STAT) & STAT_INT) {
2307                        spin_lock_irq(info->host->host_lock);
2308                        fas216_intr(info);
2309                        spin_unlock_irq(info->host->host_lock);
2310                }
2311        }
2312
2313        spin_lock_irq(info->host->host_lock);
2314
2315        done(SCpnt);
2316
2317        return 0;
2318}
2319
2320DEF_SCSI_QCMD(fas216_noqueue_command)
2321
2322/*
2323 * Error handler timeout function.  Indicate that we timed out,
2324 * and wake up any error handler process so it can continue.
2325 */
2326static void fas216_eh_timer(struct timer_list *t)
2327{
2328        FAS216_Info *info = from_timer(info, t, eh_timer);
2329
2330        fas216_log(info, LOG_ERROR, "error handling timed out\n");
2331
2332        del_timer(&info->eh_timer);
2333
2334        if (info->rst_bus_status == 0)
2335                info->rst_bus_status = -1;
2336        if (info->rst_dev_status == 0)
2337                info->rst_dev_status = -1;
2338
2339        wake_up(&info->eh_wait);
2340}
2341
2342enum res_find {
2343        res_failed,             /* not found                    */
2344        res_success,            /* command on issue queue       */
2345        res_hw_abort            /* command on disconnected dev  */
2346};
2347
2348/**
2349 * fas216_do_abort - decide how to abort a command
2350 * @SCpnt: command to abort
2351 *
2352 * Decide how to abort a command.
2353 * Returns: abort status
2354 */
2355static enum res_find fas216_find_command(FAS216_Info *info,
2356                                         struct scsi_cmnd *SCpnt)
2357{
2358        enum res_find res = res_failed;
2359
2360        if (queue_remove_cmd(&info->queues.issue, SCpnt)) {
2361                /*
2362                 * The command was on the issue queue, and has not been
2363                 * issued yet.  We can remove the command from the queue,
2364                 * and acknowledge the abort.  Neither the device nor the
2365                 * interface know about the command.
2366                 */
2367                printk("on issue queue ");
2368
2369                res = res_success;
2370        } else if (queue_remove_cmd(&info->queues.disconnected, SCpnt)) {
2371                /*
2372                 * The command was on the disconnected queue.  We must
2373                 * reconnect with the device if possible, and send it
2374                 * an abort message.
2375                 */
2376                printk("on disconnected queue ");
2377
2378                res = res_hw_abort;
2379        } else if (info->SCpnt == SCpnt) {
2380                printk("executing ");
2381
2382                switch (info->scsi.phase) {
2383                /*
2384                 * If the interface is idle, and the command is 'disconnectable',
2385                 * then it is the same as on the disconnected queue.
2386                 */
2387                case PHASE_IDLE:
2388                        if (info->scsi.disconnectable) {
2389                                info->scsi.disconnectable = 0;
2390                                info->SCpnt = NULL;
2391                                res = res_hw_abort;
2392                        }
2393                        break;
2394
2395                default:
2396                        break;
2397                }
2398        } else if (info->origSCpnt == SCpnt) {
2399                /*
2400                 * The command will be executed next, but a command
2401                 * is currently using the interface.  This is similar to
2402                 * being on the issue queue, except the busylun bit has
2403                 * been set.
2404                 */
2405                info->origSCpnt = NULL;
2406                clear_bit(SCpnt->device->id * 8 +
2407                          (u8)(SCpnt->device->lun & 0x7), info->busyluns);
2408                printk("waiting for execution ");
2409                res = res_success;
2410        } else
2411                printk("unknown ");
2412
2413        return res;
2414}
2415
2416/**
2417 * fas216_eh_abort - abort this command
2418 * @SCpnt: command to abort
2419 *
2420 * Abort this command.
2421 * Returns: FAILED if unable to abort
2422 * Notes: io_request_lock is taken, and irqs are disabled
2423 */
2424int fas216_eh_abort(struct scsi_cmnd *SCpnt)
2425{
2426        FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2427        int result = FAILED;
2428
2429        fas216_checkmagic(info);
2430
2431        info->stats.aborts += 1;
2432
2433        scmd_printk(KERN_WARNING, SCpnt, "abort command\n");
2434
2435        print_debug_list();
2436        fas216_dumpstate(info);
2437
2438        switch (fas216_find_command(info, SCpnt)) {
2439        /*
2440         * We found the command, and cleared it out.  Either
2441         * the command is still known to be executing on the
2442         * target, or the busylun bit is not set.
2443         */
2444        case res_success:
2445                scmd_printk(KERN_WARNING, SCpnt, "abort %p success\n", SCpnt);
2446                result = SUCCESS;
2447                break;
2448
2449        /*
2450         * We need to reconnect to the target and send it an
2451         * ABORT or ABORT_TAG message.  We can only do this
2452         * if the bus is free.
2453         */
2454        case res_hw_abort:
2455
2456        /*
2457         * We are unable to abort the command for some reason.
2458         */
2459        default:
2460        case res_failed:
2461                scmd_printk(KERN_WARNING, SCpnt, "abort %p failed\n", SCpnt);
2462                break;
2463        }
2464
2465        return result;
2466}
2467
2468/**
2469 * fas216_eh_device_reset - Reset the device associated with this command
2470 * @SCpnt: command specifing device to reset
2471 *
2472 * Reset the device associated with this command.
2473 * Returns: FAILED if unable to reset.
2474 * Notes: We won't be re-entered, so we'll only have one device
2475 * reset on the go at one time.
2476 */
2477int fas216_eh_device_reset(struct scsi_cmnd *SCpnt)
2478{
2479        FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2480        unsigned long flags;
2481        int i, res = FAILED, target = SCpnt->device->id;
2482
2483        fas216_log(info, LOG_ERROR, "device reset for target %d", target);
2484
2485        spin_lock_irqsave(&info->host_lock, flags);
2486
2487        do {
2488                /*
2489                 * If we are currently connected to a device, and
2490                 * it is the device we want to reset, there is
2491                 * nothing we can do here.  Chances are it is stuck,
2492                 * and we need a bus reset.
2493                 */
2494                if (info->SCpnt && !info->scsi.disconnectable &&
2495                    info->SCpnt->device->id == SCpnt->device->id)
2496                        break;
2497
2498                /*
2499                 * We're going to be resetting this device.  Remove
2500                 * all pending commands from the driver.  By doing
2501                 * so, we guarantee that we won't touch the command
2502                 * structures except to process the reset request.
2503                 */
2504                queue_remove_all_target(&info->queues.issue, target);
2505                queue_remove_all_target(&info->queues.disconnected, target);
2506                if (info->origSCpnt && info->origSCpnt->device->id == target)
2507                        info->origSCpnt = NULL;
2508                if (info->reqSCpnt && info->reqSCpnt->device->id == target)
2509                        info->reqSCpnt = NULL;
2510                for (i = 0; i < 8; i++)
2511                        clear_bit(target * 8 + i, info->busyluns);
2512
2513                /*
2514                 * Hijack this SCSI command structure to send
2515                 * a bus device reset message to this device.
2516                 */
2517                SCpnt->host_scribble = (void *)fas216_devicereset_done;
2518
2519                info->rst_dev_status = 0;
2520                info->rstSCpnt = SCpnt;
2521
2522                if (info->scsi.phase == PHASE_IDLE)
2523                        fas216_kick(info);
2524
2525                mod_timer(&info->eh_timer, jiffies + 30 * HZ);
2526                spin_unlock_irqrestore(&info->host_lock, flags);
2527
2528                /*
2529                 * Wait up to 30 seconds for the reset to complete.
2530                 */
2531                wait_event(info->eh_wait, info->rst_dev_status);
2532
2533                del_timer_sync(&info->eh_timer);
2534                spin_lock_irqsave(&info->host_lock, flags);
2535                info->rstSCpnt = NULL;
2536
2537                if (info->rst_dev_status == 1)
2538                        res = SUCCESS;
2539        } while (0);
2540
2541        SCpnt->host_scribble = NULL;
2542        spin_unlock_irqrestore(&info->host_lock, flags);
2543
2544        fas216_log(info, LOG_ERROR, "device reset complete: %s\n",
2545                   res == SUCCESS ? "success" : "failed");
2546
2547        return res;
2548}
2549
2550/**
2551 * fas216_eh_bus_reset - Reset the bus associated with the command
2552 * @SCpnt: command specifing bus to reset
2553 *
2554 * Reset the bus associated with the command.
2555 * Returns: FAILED if unable to reset.
2556 * Notes: Further commands are blocked.
2557 */
2558int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt)
2559{
2560        FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2561        unsigned long flags;
2562        struct scsi_device *SDpnt;
2563
2564        fas216_checkmagic(info);
2565        fas216_log(info, LOG_ERROR, "resetting bus");
2566
2567        info->stats.bus_resets += 1;
2568
2569        spin_lock_irqsave(&info->host_lock, flags);
2570
2571        /*
2572         * Stop all activity on this interface.
2573         */
2574        fas216_aborttransfer(info);
2575        fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
2576
2577        /*
2578         * Clear any pending interrupts.
2579         */
2580        while (fas216_readb(info, REG_STAT) & STAT_INT)
2581                fas216_readb(info, REG_INST);
2582
2583        info->rst_bus_status = 0;
2584
2585        /*
2586         * For each attached hard-reset device, clear out
2587         * all command structures.  Leave the running
2588         * command in place.
2589         */
2590        shost_for_each_device(SDpnt, info->host) {
2591                int i;
2592
2593                if (SDpnt->soft_reset)
2594                        continue;
2595
2596                queue_remove_all_target(&info->queues.issue, SDpnt->id);
2597                queue_remove_all_target(&info->queues.disconnected, SDpnt->id);
2598                if (info->origSCpnt && info->origSCpnt->device->id == SDpnt->id)
2599                        info->origSCpnt = NULL;
2600                if (info->reqSCpnt && info->reqSCpnt->device->id == SDpnt->id)
2601                        info->reqSCpnt = NULL;
2602                info->SCpnt = NULL;
2603
2604                for (i = 0; i < 8; i++)
2605                        clear_bit(SDpnt->id * 8 + i, info->busyluns);
2606        }
2607
2608        info->scsi.phase = PHASE_IDLE;
2609
2610        /*
2611         * Reset the SCSI bus.  Device cleanup happens in
2612         * the interrupt handler.
2613         */
2614        fas216_cmd(info, CMD_RESETSCSI);
2615
2616        mod_timer(&info->eh_timer, jiffies + HZ);
2617        spin_unlock_irqrestore(&info->host_lock, flags);
2618
2619        /*
2620         * Wait one second for the interrupt.
2621         */
2622        wait_event(info->eh_wait, info->rst_bus_status);
2623        del_timer_sync(&info->eh_timer);
2624
2625        fas216_log(info, LOG_ERROR, "bus reset complete: %s\n",
2626                   info->rst_bus_status == 1 ? "success" : "failed");
2627
2628        return info->rst_bus_status == 1 ? SUCCESS : FAILED;
2629}
2630
2631/**
2632 * fas216_init_chip - Initialise FAS216 state after reset
2633 * @info: state structure for interface
2634 *
2635 * Initialise FAS216 state after reset
2636 */
2637static void fas216_init_chip(FAS216_Info *info)
2638{
2639        unsigned int clock = ((info->ifcfg.clockrate - 1) / 5 + 1) & 7;
2640        fas216_writeb(info, REG_CLKF, clock);
2641        fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2642        fas216_writeb(info, REG_CNTL2, info->scsi.cfg[1]);
2643        fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
2644        fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
2645        fas216_writeb(info, REG_SOF, 0);
2646        fas216_writeb(info, REG_STP, info->scsi.async_stp);
2647        fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2648}
2649
2650/**
2651 * fas216_eh_host_reset - Reset the host associated with this command
2652 * @SCpnt: command specifing host to reset
2653 *
2654 * Reset the host associated with this command.
2655 * Returns: FAILED if unable to reset.
2656 * Notes: io_request_lock is taken, and irqs are disabled
2657 */
2658int fas216_eh_host_reset(struct scsi_cmnd *SCpnt)
2659{
2660        FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2661
2662        spin_lock_irq(info->host->host_lock);
2663
2664        fas216_checkmagic(info);
2665
2666        fas216_log(info, LOG_ERROR, "resetting host");
2667
2668        /*
2669         * Reset the SCSI chip.
2670         */
2671        fas216_cmd(info, CMD_RESETCHIP);
2672
2673        /*
2674         * Ugly ugly ugly!
2675         * We need to release the host_lock and enable
2676         * IRQs if we sleep, but we must relock and disable
2677         * IRQs after the sleep.
2678         */
2679        spin_unlock_irq(info->host->host_lock);
2680        msleep(50 * 1000/100);
2681        spin_lock_irq(info->host->host_lock);
2682
2683        /*
2684         * Release the SCSI reset.
2685         */
2686        fas216_cmd(info, CMD_NOP);
2687
2688        fas216_init_chip(info);
2689
2690        spin_unlock_irq(info->host->host_lock);
2691        return SUCCESS;
2692}
2693
2694#define TYPE_UNKNOWN    0
2695#define TYPE_NCR53C90   1
2696#define TYPE_NCR53C90A  2
2697#define TYPE_NCR53C9x   3
2698#define TYPE_Am53CF94   4
2699#define TYPE_EmFAS216   5
2700#define TYPE_QLFAS216   6
2701
2702static char *chip_types[] = {
2703        "unknown",
2704        "NS NCR53C90",
2705        "NS NCR53C90A",
2706        "NS NCR53C9x",
2707        "AMD Am53CF94",
2708        "Emulex FAS216",
2709        "QLogic FAS216"
2710};
2711
2712static int fas216_detect_type(FAS216_Info *info)
2713{
2714        int family, rev;
2715
2716        /*
2717         * Reset the chip.
2718         */
2719        fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2720        udelay(50);
2721        fas216_writeb(info, REG_CMD, CMD_NOP);
2722
2723        /*
2724         * Check to see if control reg 2 is present.
2725         */
2726        fas216_writeb(info, REG_CNTL3, 0);
2727        fas216_writeb(info, REG_CNTL2, CNTL2_S2FE);
2728
2729        /*
2730         * If we are unable to read back control reg 2
2731         * correctly, it is not present, and we have a
2732         * NCR53C90.
2733         */
2734        if ((fas216_readb(info, REG_CNTL2) & (~0xe0)) != CNTL2_S2FE)
2735                return TYPE_NCR53C90;
2736
2737        /*
2738         * Now, check control register 3
2739         */
2740        fas216_writeb(info, REG_CNTL2, 0);
2741        fas216_writeb(info, REG_CNTL3, 0);
2742        fas216_writeb(info, REG_CNTL3, 5);
2743
2744        /*
2745         * If we are unable to read the register back
2746         * correctly, we have a NCR53C90A
2747         */
2748        if (fas216_readb(info, REG_CNTL3) != 5)
2749                return TYPE_NCR53C90A;
2750
2751        /*
2752         * Now read the ID from the chip.
2753         */
2754        fas216_writeb(info, REG_CNTL3, 0);
2755
2756        fas216_writeb(info, REG_CNTL3, CNTL3_ADIDCHK);
2757        fas216_writeb(info, REG_CNTL3, 0);
2758
2759        fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2760        udelay(50);
2761        fas216_writeb(info, REG_CMD, CMD_WITHDMA | CMD_NOP);
2762
2763        fas216_writeb(info, REG_CNTL2, CNTL2_ENF);
2764        fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2765        udelay(50);
2766        fas216_writeb(info, REG_CMD, CMD_NOP);
2767
2768        rev     = fas216_readb(info, REG_ID);
2769        family  = rev >> 3;
2770        rev    &= 7;
2771
2772        switch (family) {
2773        case 0x01:
2774                if (rev == 4)
2775                        return TYPE_Am53CF94;
2776                break;
2777
2778        case 0x02:
2779                switch (rev) {
2780                case 2:
2781                        return TYPE_EmFAS216;
2782                case 3:
2783                        return TYPE_QLFAS216;
2784                }
2785                break;
2786
2787        default:
2788                break;
2789        }
2790        printk("family %x rev %x\n", family, rev);
2791        return TYPE_NCR53C9x;
2792}
2793
2794/**
2795 * fas216_reset_state - Initialise driver internal state
2796 * @info: state to initialise
2797 *
2798 * Initialise driver internal state
2799 */
2800static void fas216_reset_state(FAS216_Info *info)
2801{
2802        int i;
2803
2804        fas216_checkmagic(info);
2805
2806        fas216_bus_reset(info);
2807
2808        /*
2809         * Clear out all stale info in our state structure
2810         */
2811        memset(info->busyluns, 0, sizeof(info->busyluns));
2812        info->scsi.disconnectable = 0;
2813        info->scsi.aborting = 0;
2814
2815        for (i = 0; i < 8; i++) {
2816                info->device[i].parity_enabled  = 0;
2817                info->device[i].parity_check    = 1;
2818        }
2819
2820        /*
2821         * Drain all commands on disconnected queue
2822         */
2823        while (queue_remove(&info->queues.disconnected) != NULL);
2824
2825        /*
2826         * Remove executing commands.
2827         */
2828        info->SCpnt     = NULL;
2829        info->reqSCpnt  = NULL;
2830        info->rstSCpnt  = NULL;
2831        info->origSCpnt = NULL;
2832}
2833
2834/**
2835 * fas216_init - initialise FAS/NCR/AMD SCSI structures.
2836 * @host: a driver-specific filled-out structure
2837 *
2838 * Initialise FAS/NCR/AMD SCSI structures.
2839 * Returns: 0 on success
2840 */
2841int fas216_init(struct Scsi_Host *host)
2842{
2843        FAS216_Info *info = (FAS216_Info *)host->hostdata;
2844
2845        info->magic_start    = MAGIC;
2846        info->magic_end      = MAGIC;
2847        info->host           = host;
2848        info->scsi.cfg[0]    = host->this_id | CNTL1_PERE;
2849        info->scsi.cfg[1]    = CNTL2_ENF | CNTL2_S2FE;
2850        info->scsi.cfg[2]    = info->ifcfg.cntl3 |
2851                               CNTL3_ADIDCHK | CNTL3_QTAG | CNTL3_G2CB | CNTL3_LBTM;
2852        info->scsi.async_stp = fas216_syncperiod(info, info->ifcfg.asyncperiod);
2853
2854        info->rst_dev_status = -1;
2855        info->rst_bus_status = -1;
2856        init_waitqueue_head(&info->eh_wait);
2857        timer_setup(&info->eh_timer, fas216_eh_timer, 0);
2858        
2859        spin_lock_init(&info->host_lock);
2860
2861        memset(&info->stats, 0, sizeof(info->stats));
2862
2863        msgqueue_initialise(&info->scsi.msgs);
2864
2865        if (!queue_initialise(&info->queues.issue))
2866                return -ENOMEM;
2867
2868        if (!queue_initialise(&info->queues.disconnected)) {
2869                queue_free(&info->queues.issue);
2870                return -ENOMEM;
2871        }
2872
2873        return 0;
2874}
2875
2876/**
2877 * fas216_add - initialise FAS/NCR/AMD SCSI ic.
2878 * @host: a driver-specific filled-out structure
2879 * @dev: parent device
2880 *
2881 * Initialise FAS/NCR/AMD SCSI ic.
2882 * Returns: 0 on success
2883 */
2884int fas216_add(struct Scsi_Host *host, struct device *dev)
2885{
2886        FAS216_Info *info = (FAS216_Info *)host->hostdata;
2887        int type, ret;
2888
2889        if (info->ifcfg.clockrate <= 10 || info->ifcfg.clockrate > 40) {
2890                printk(KERN_CRIT "fas216: invalid clock rate %u MHz\n",
2891                        info->ifcfg.clockrate);
2892                return -EINVAL;
2893        }
2894
2895        fas216_reset_state(info);
2896        type = fas216_detect_type(info);
2897        info->scsi.type = chip_types[type];
2898
2899        udelay(300);
2900
2901        /*
2902         * Initialise the chip correctly.
2903         */
2904        fas216_init_chip(info);
2905
2906        /*
2907         * Reset the SCSI bus.  We don't want to see
2908         * the resulting reset interrupt, so mask it
2909         * out.
2910         */
2911        fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_DISR);
2912        fas216_writeb(info, REG_CMD, CMD_RESETSCSI);
2913
2914        /*
2915         * scsi standard says wait 250ms
2916         */
2917        spin_unlock_irq(info->host->host_lock);
2918        msleep(100*1000/100);
2919        spin_lock_irq(info->host->host_lock);
2920
2921        fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2922        fas216_readb(info, REG_INST);
2923
2924        fas216_checkmagic(info);
2925
2926        ret = scsi_add_host(host, dev);
2927        if (ret)
2928                fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2929        else
2930                scsi_scan_host(host);
2931
2932        return ret;
2933}
2934
2935void fas216_remove(struct Scsi_Host *host)
2936{
2937        FAS216_Info *info = (FAS216_Info *)host->hostdata;
2938
2939        fas216_checkmagic(info);
2940        scsi_remove_host(host);
2941
2942        fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2943        scsi_host_put(host);
2944}
2945
2946/**
2947 * fas216_release - release all resources for FAS/NCR/AMD SCSI ic.
2948 * @host: a driver-specific filled-out structure
2949 *
2950 * release all resources and put everything to bed for FAS/NCR/AMD SCSI ic.
2951 */
2952void fas216_release(struct Scsi_Host *host)
2953{
2954        FAS216_Info *info = (FAS216_Info *)host->hostdata;
2955
2956        queue_free(&info->queues.disconnected);
2957        queue_free(&info->queues.issue);
2958}
2959
2960void fas216_print_host(FAS216_Info *info, struct seq_file *m)
2961{
2962        seq_printf(m,
2963                        "\n"
2964                        "Chip    : %s\n"
2965                        " Address: 0x%p\n"
2966                        " IRQ    : %d\n"
2967                        " DMA    : %d\n",
2968                        info->scsi.type, info->scsi.io_base,
2969                        info->scsi.irq, info->scsi.dma);
2970}
2971
2972void fas216_print_stats(FAS216_Info *info, struct seq_file *m)
2973{
2974        seq_printf(m, "\n"
2975                        "Command Statistics:\n"
2976                        " Queued     : %u\n"
2977                        " Issued     : %u\n"
2978                        " Completed  : %u\n"
2979                        " Reads      : %u\n"
2980                        " Writes     : %u\n"
2981                        " Others     : %u\n"
2982                        " Disconnects: %u\n"
2983                        " Aborts     : %u\n"
2984                        " Bus resets : %u\n"
2985                        " Host resets: %u\n",
2986                        info->stats.queues,      info->stats.removes,
2987                        info->stats.fins,        info->stats.reads,
2988                        info->stats.writes,      info->stats.miscs,
2989                        info->stats.disconnects, info->stats.aborts,
2990                        info->stats.bus_resets,  info->stats.host_resets);
2991}
2992
2993void fas216_print_devices(FAS216_Info *info, struct seq_file *m)
2994{
2995        struct fas216_device *dev;
2996        struct scsi_device *scd;
2997
2998        seq_puts(m, "Device/Lun TaggedQ       Parity   Sync\n");
2999
3000        shost_for_each_device(scd, info->host) {
3001                dev = &info->device[scd->id];
3002                seq_printf(m, "     %d/%llu   ", scd->id, scd->lun);
3003                if (scd->tagged_supported)
3004                        seq_printf(m, "%3sabled(%3d) ",
3005                                     scd->simple_tags ? "en" : "dis",
3006                                     scd->current_tag);
3007                else
3008                        seq_puts(m, "unsupported   ");
3009
3010                seq_printf(m, "%3sabled ", dev->parity_enabled ? "en" : "dis");
3011
3012                if (dev->sof)
3013                        seq_printf(m, "offset %d, %d ns\n",
3014                                     dev->sof, dev->period * 4);
3015                else
3016                        seq_puts(m, "async\n");
3017        }
3018}
3019
3020EXPORT_SYMBOL(fas216_init);
3021EXPORT_SYMBOL(fas216_add);
3022EXPORT_SYMBOL(fas216_queue_command);
3023EXPORT_SYMBOL(fas216_noqueue_command);
3024EXPORT_SYMBOL(fas216_intr);
3025EXPORT_SYMBOL(fas216_remove);
3026EXPORT_SYMBOL(fas216_release);
3027EXPORT_SYMBOL(fas216_eh_abort);
3028EXPORT_SYMBOL(fas216_eh_device_reset);
3029EXPORT_SYMBOL(fas216_eh_bus_reset);
3030EXPORT_SYMBOL(fas216_eh_host_reset);
3031EXPORT_SYMBOL(fas216_print_host);
3032EXPORT_SYMBOL(fas216_print_stats);
3033EXPORT_SYMBOL(fas216_print_devices);
3034
3035MODULE_AUTHOR("Russell King");
3036MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core");
3037MODULE_LICENSE("GPL");
3038