linux/drivers/scsi/arm/fas216.c
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   1/*
   2 *  linux/drivers/acorn/scsi/fas216.c
   3 *
   4 *  Copyright (C) 1997-2003 Russell King
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 *
  10 * Based on information in qlogicfas.c by Tom Zerucha, Michael Griffith, and
  11 * other sources, including:
  12 *   the AMD Am53CF94 data sheet
  13 *   the AMD Am53C94 data sheet
  14 *
  15 * This is a generic driver.  To use it, have a look at cumana_2.c.  You
  16 * should define your own structure that overlays FAS216_Info, eg:
  17 * struct my_host_data {
  18 *    FAS216_Info info;
  19 *    ... my host specific data ...
  20 * };
  21 *
  22 * Changelog:
  23 *  30-08-1997  RMK     Created
  24 *  14-09-1997  RMK     Started disconnect support
  25 *  08-02-1998  RMK     Corrected real DMA support
  26 *  15-02-1998  RMK     Started sync xfer support
  27 *  06-04-1998  RMK     Tightened conditions for printing incomplete
  28 *                      transfers
  29 *  02-05-1998  RMK     Added extra checks in fas216_reset
  30 *  24-05-1998  RMK     Fixed synchronous transfers with period >= 200ns
  31 *  27-06-1998  RMK     Changed asm/delay.h to linux/delay.h
  32 *  26-08-1998  RMK     Improved message support wrt MESSAGE_REJECT
  33 *  02-04-2000  RMK     Converted to use the new error handling, and
  34 *                      automatically request sense data upon check
  35 *                      condition status from targets.
  36 */
  37#include <linux/module.h>
  38#include <linux/blkdev.h>
  39#include <linux/kernel.h>
  40#include <linux/string.h>
  41#include <linux/ioport.h>
  42#include <linux/proc_fs.h>
  43#include <linux/delay.h>
  44#include <linux/bitops.h>
  45#include <linux/init.h>
  46#include <linux/interrupt.h>
  47
  48#include <asm/dma.h>
  49#include <asm/io.h>
  50#include <asm/irq.h>
  51#include <asm/ecard.h>
  52
  53#include "../scsi.h"
  54#include <scsi/scsi_dbg.h>
  55#include <scsi/scsi_host.h>
  56#include "fas216.h"
  57#include "scsi.h"
  58
  59/* NOTE: SCSI2 Synchronous transfers *require* DMA according to
  60 *  the data sheet.  This restriction is crazy, especially when
  61 *  you only want to send 16 bytes!  What were the guys who
  62 *  designed this chip on at that time?  Did they read the SCSI2
  63 *  spec at all?  The following sections are taken from the SCSI2
  64 *  standard (s2r10) concerning this:
  65 *
  66 * > IMPLEMENTORS NOTES:
  67 * >   (1)  Re-negotiation at every selection is not recommended, since a
  68 * >   significant performance impact is likely.
  69 *
  70 * >  The implied synchronous agreement shall remain in effect until a BUS DEVICE
  71 * >  RESET message is received, until a hard reset condition occurs, or until one
  72 * >  of the two SCSI devices elects to modify the agreement.  The default data
  73 * >  transfer mode is asynchronous data transfer mode.  The default data transfer
  74 * >  mode is entered at power on, after a BUS DEVICE RESET message, or after a hard
  75 * >  reset condition.
  76 *
  77 *  In total, this means that once you have elected to use synchronous
  78 *  transfers, you must always use DMA.
  79 *
  80 *  I was thinking that this was a good chip until I found this restriction ;(
  81 */
  82#define SCSI2_SYNC
  83#undef  SCSI2_TAG
  84
  85#undef DEBUG_CONNECT
  86#undef DEBUG_MESSAGES
  87
  88#undef CHECK_STRUCTURE
  89
  90#define LOG_CONNECT             (1 << 0)
  91#define LOG_BUSSERVICE          (1 << 1)
  92#define LOG_FUNCTIONDONE        (1 << 2)
  93#define LOG_MESSAGES            (1 << 3)
  94#define LOG_BUFFER              (1 << 4)
  95#define LOG_ERROR               (1 << 8)
  96
  97static int level_mask = LOG_ERROR;
  98
  99module_param(level_mask, int, 0644);
 100
 101#ifndef MODULE
 102static int __init fas216_log_setup(char *str)
 103{
 104        char *s;
 105
 106        level_mask = 0;
 107
 108        while ((s = strsep(&str, ",")) != NULL) {
 109                switch (s[0]) {
 110                case 'a':
 111                        if (strcmp(s, "all") == 0)
 112                                level_mask |= -1;
 113                        break;
 114                case 'b':
 115                        if (strncmp(s, "bus", 3) == 0)
 116                                level_mask |= LOG_BUSSERVICE;
 117                        if (strncmp(s, "buf", 3) == 0)
 118                                level_mask |= LOG_BUFFER;
 119                        break;
 120                case 'c':
 121                        level_mask |= LOG_CONNECT;
 122                        break;
 123                case 'e':
 124                        level_mask |= LOG_ERROR;
 125                        break;
 126                case 'm':
 127                        level_mask |= LOG_MESSAGES;
 128                        break;
 129                case 'n':
 130                        if (strcmp(s, "none") == 0)
 131                                level_mask = 0;
 132                        break;
 133                case 's':
 134                        level_mask |= LOG_FUNCTIONDONE;
 135                        break;
 136                }
 137        }
 138        return 1;
 139}
 140
 141__setup("fas216_logging=", fas216_log_setup);
 142#endif
 143
 144static inline unsigned char fas216_readb(FAS216_Info *info, unsigned int reg)
 145{
 146        unsigned int off = reg << info->scsi.io_shift;
 147        return readb(info->scsi.io_base + off);
 148}
 149
 150static inline void fas216_writeb(FAS216_Info *info, unsigned int reg, unsigned int val)
 151{
 152        unsigned int off = reg << info->scsi.io_shift;
 153        writeb(val, info->scsi.io_base + off);
 154}
 155
 156static void fas216_dumpstate(FAS216_Info *info)
 157{
 158        unsigned char is, stat, inst;
 159
 160        is   = fas216_readb(info, REG_IS);
 161        stat = fas216_readb(info, REG_STAT);
 162        inst = fas216_readb(info, REG_INST);
 163        
 164        printk("FAS216: CTCL=%02X CTCM=%02X CMD=%02X STAT=%02X"
 165               " INST=%02X IS=%02X CFIS=%02X",
 166                fas216_readb(info, REG_CTCL),
 167                fas216_readb(info, REG_CTCM),
 168                fas216_readb(info, REG_CMD),  stat, inst, is,
 169                fas216_readb(info, REG_CFIS));
 170        printk(" CNTL1=%02X CNTL2=%02X CNTL3=%02X CTCH=%02X\n",
 171                fas216_readb(info, REG_CNTL1),
 172                fas216_readb(info, REG_CNTL2),
 173                fas216_readb(info, REG_CNTL3),
 174                fas216_readb(info, REG_CTCH));
 175}
 176
 177static void print_SCp(struct scsi_pointer *SCp, const char *prefix, const char *suffix)
 178{
 179        printk("%sptr %p this_residual 0x%x buffer %p buffers_residual 0x%x%s",
 180                prefix, SCp->ptr, SCp->this_residual, SCp->buffer,
 181                SCp->buffers_residual, suffix);
 182}
 183
 184#ifdef CHECK_STRUCTURE
 185static void fas216_dumpinfo(FAS216_Info *info)
 186{
 187        static int used = 0;
 188        int i;
 189
 190        if (used++)
 191                return;
 192
 193        printk("FAS216_Info=\n");
 194        printk("  { magic_start=%lX host=%p SCpnt=%p origSCpnt=%p\n",
 195                info->magic_start, info->host, info->SCpnt,
 196                info->origSCpnt);
 197        printk("    scsi={ io_shift=%X irq=%X cfg={ %X %X %X %X }\n",
 198                info->scsi.io_shift, info->scsi.irq,
 199                info->scsi.cfg[0], info->scsi.cfg[1], info->scsi.cfg[2],
 200                info->scsi.cfg[3]);
 201        printk("           type=%p phase=%X\n",
 202                info->scsi.type, info->scsi.phase);
 203        print_SCp(&info->scsi.SCp, "           SCp={ ", " }\n");
 204        printk("      msgs async_stp=%X disconnectable=%d aborting=%d }\n",
 205                info->scsi.async_stp,
 206                info->scsi.disconnectable, info->scsi.aborting);
 207        printk("    stats={ queues=%X removes=%X fins=%X reads=%X writes=%X miscs=%X\n"
 208               "            disconnects=%X aborts=%X bus_resets=%X host_resets=%X}\n",
 209                info->stats.queues, info->stats.removes, info->stats.fins,
 210                info->stats.reads, info->stats.writes, info->stats.miscs,
 211                info->stats.disconnects, info->stats.aborts, info->stats.bus_resets,
 212                info->stats.host_resets);
 213        printk("    ifcfg={ clockrate=%X select_timeout=%X asyncperiod=%X sync_max_depth=%X }\n",
 214                info->ifcfg.clockrate, info->ifcfg.select_timeout,
 215                info->ifcfg.asyncperiod, info->ifcfg.sync_max_depth);
 216        for (i = 0; i < 8; i++) {
 217                printk("    busyluns[%d]=%08lx dev[%d]={ disconnect_ok=%d stp=%X sof=%X sync_state=%X }\n",
 218                        i, info->busyluns[i], i,
 219                        info->device[i].disconnect_ok, info->device[i].stp,
 220                        info->device[i].sof, info->device[i].sync_state);
 221        }
 222        printk("    dma={ transfer_type=%X setup=%p pseudo=%p stop=%p }\n",
 223                info->dma.transfer_type, info->dma.setup,
 224                info->dma.pseudo, info->dma.stop);
 225        printk("    internal_done=%X magic_end=%lX }\n",
 226                info->internal_done, info->magic_end);
 227}
 228
 229static void __fas216_checkmagic(FAS216_Info *info, const char *func)
 230{
 231        int corruption = 0;
 232        if (info->magic_start != MAGIC) {
 233                printk(KERN_CRIT "FAS216 Error: magic at start corrupted\n");
 234                corruption++;
 235        }
 236        if (info->magic_end != MAGIC) {
 237                printk(KERN_CRIT "FAS216 Error: magic at end corrupted\n");
 238                corruption++;
 239        }
 240        if (corruption) {
 241                fas216_dumpinfo(info);
 242                panic("scsi memory space corrupted in %s", func);
 243        }
 244}
 245#define fas216_checkmagic(info) __fas216_checkmagic((info), __func__)
 246#else
 247#define fas216_checkmagic(info)
 248#endif
 249
 250static const char *fas216_bus_phase(int stat)
 251{
 252        static const char *phases[] = {
 253                "DATA OUT", "DATA IN",
 254                "COMMAND", "STATUS",
 255                "MISC OUT", "MISC IN",
 256                "MESG OUT", "MESG IN"
 257        };
 258
 259        return phases[stat & STAT_BUSMASK];
 260}
 261
 262static const char *fas216_drv_phase(FAS216_Info *info)
 263{
 264        static const char *phases[] = {
 265                [PHASE_IDLE]            = "idle",
 266                [PHASE_SELECTION]       = "selection",
 267                [PHASE_COMMAND]         = "command",
 268                [PHASE_DATAOUT]         = "data out",
 269                [PHASE_DATAIN]          = "data in",
 270                [PHASE_MSGIN]           = "message in",
 271                [PHASE_MSGIN_DISCONNECT]= "disconnect",
 272                [PHASE_MSGOUT_EXPECT]   = "expect message out",
 273                [PHASE_MSGOUT]          = "message out",
 274                [PHASE_STATUS]          = "status",
 275                [PHASE_DONE]            = "done",
 276        };
 277
 278        if (info->scsi.phase < ARRAY_SIZE(phases) &&
 279            phases[info->scsi.phase])
 280                return phases[info->scsi.phase];
 281        return "???";
 282}
 283
 284static char fas216_target(FAS216_Info *info)
 285{
 286        if (info->SCpnt)
 287                return '0' + info->SCpnt->device->id;
 288        else
 289                return 'H';
 290}
 291
 292static void
 293fas216_do_log(FAS216_Info *info, char target, char *fmt, va_list ap)
 294{
 295        static char buf[1024];
 296
 297        vsnprintf(buf, sizeof(buf), fmt, ap);
 298        printk("scsi%d.%c: %s", info->host->host_no, target, buf);
 299}
 300
 301static void fas216_log_command(FAS216_Info *info, int level,
 302                               struct scsi_cmnd *SCpnt, char *fmt, ...)
 303{
 304        va_list args;
 305
 306        if (level != 0 && !(level & level_mask))
 307                return;
 308
 309        va_start(args, fmt);
 310        fas216_do_log(info, '0' + SCpnt->device->id, fmt, args);
 311        va_end(args);
 312
 313        scsi_print_command(SCpnt);
 314}
 315
 316static void
 317fas216_log_target(FAS216_Info *info, int level, int target, char *fmt, ...)
 318{
 319        va_list args;
 320
 321        if (level != 0 && !(level & level_mask))
 322                return;
 323
 324        if (target < 0)
 325                target = 'H';
 326        else
 327                target += '0';
 328
 329        va_start(args, fmt);
 330        fas216_do_log(info, target, fmt, args);
 331        va_end(args);
 332
 333        printk("\n");
 334}
 335
 336static void fas216_log(FAS216_Info *info, int level, char *fmt, ...)
 337{
 338        va_list args;
 339
 340        if (level != 0 && !(level & level_mask))
 341                return;
 342
 343        va_start(args, fmt);
 344        fas216_do_log(info, fas216_target(info), fmt, args);
 345        va_end(args);
 346
 347        printk("\n");
 348}
 349
 350#define PH_SIZE 32
 351
 352static struct { int stat, ssr, isr, ph; } ph_list[PH_SIZE];
 353static int ph_ptr;
 354
 355static void add_debug_list(int stat, int ssr, int isr, int ph)
 356{
 357        ph_list[ph_ptr].stat = stat;
 358        ph_list[ph_ptr].ssr = ssr;
 359        ph_list[ph_ptr].isr = isr;
 360        ph_list[ph_ptr].ph = ph;
 361
 362        ph_ptr = (ph_ptr + 1) & (PH_SIZE-1);
 363}
 364
 365static struct { int command; void *from; } cmd_list[8];
 366static int cmd_ptr;
 367
 368static void fas216_cmd(FAS216_Info *info, unsigned int command)
 369{
 370        cmd_list[cmd_ptr].command = command;
 371        cmd_list[cmd_ptr].from = __builtin_return_address(0);
 372
 373        cmd_ptr = (cmd_ptr + 1) & 7;
 374
 375        fas216_writeb(info, REG_CMD, command);
 376}
 377
 378static void print_debug_list(void)
 379{
 380        int i;
 381
 382        i = ph_ptr;
 383
 384        printk(KERN_ERR "SCSI IRQ trail\n");
 385        do {
 386                printk(" %02x:%02x:%02x:%1x",
 387                        ph_list[i].stat, ph_list[i].ssr,
 388                        ph_list[i].isr, ph_list[i].ph);
 389                i = (i + 1) & (PH_SIZE - 1);
 390                if (((i ^ ph_ptr) & 7) == 0)
 391                        printk("\n");
 392        } while (i != ph_ptr);
 393        if ((i ^ ph_ptr) & 7)
 394                printk("\n");
 395
 396        i = cmd_ptr;
 397        printk(KERN_ERR "FAS216 commands: ");
 398        do {
 399                printk("%02x:%p ", cmd_list[i].command, cmd_list[i].from);
 400                i = (i + 1) & 7;
 401        } while (i != cmd_ptr);
 402        printk("\n");
 403}
 404
 405static void fas216_done(FAS216_Info *info, unsigned int result);
 406
 407/**
 408 * fas216_get_last_msg - retrive last message from the list
 409 * @info: interface to search
 410 * @pos: current fifo position
 411 *
 412 * Retrieve a last message from the list, using position in fifo.
 413 */
 414static inline unsigned short
 415fas216_get_last_msg(FAS216_Info *info, int pos)
 416{
 417        unsigned short packed_msg = NOP;
 418        struct message *msg;
 419        int msgnr = 0;
 420
 421        while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
 422                if (pos >= msg->fifo)
 423                        break;
 424        }
 425
 426        if (msg) {
 427                if (msg->msg[0] == EXTENDED_MESSAGE)
 428                        packed_msg = EXTENDED_MESSAGE | msg->msg[2] << 8;
 429                else
 430                        packed_msg = msg->msg[0];
 431        }
 432
 433        fas216_log(info, LOG_MESSAGES,
 434                "Message: %04x found at position %02x\n", packed_msg, pos);
 435
 436        return packed_msg;
 437}
 438
 439/**
 440 * fas216_syncperiod - calculate STP register value
 441 * @info: state structure for interface connected to device
 442 * @ns: period in ns (between subsequent bytes)
 443 *
 444 * Calculate value to be loaded into the STP register for a given period
 445 * in ns. Returns a value suitable for REG_STP.
 446 */
 447static int fas216_syncperiod(FAS216_Info *info, int ns)
 448{
 449        int value = (info->ifcfg.clockrate * ns) / 1000;
 450
 451        fas216_checkmagic(info);
 452
 453        if (value < 4)
 454                value = 4;
 455        else if (value > 35)
 456                value = 35;
 457
 458        return value & 31;
 459}
 460
 461/**
 462 * fas216_set_sync - setup FAS216 chip for specified transfer period.
 463 * @info: state structure for interface connected to device
 464 * @target: target
 465 *
 466 * Correctly setup FAS216 chip for specified transfer period.
 467 * Notes   : we need to switch the chip out of FASTSCSI mode if we have
 468 *           a transfer period >= 200ns - otherwise the chip will violate
 469 *           the SCSI timings.
 470 */
 471static void fas216_set_sync(FAS216_Info *info, int target)
 472{
 473        unsigned int cntl3;
 474
 475        fas216_writeb(info, REG_SOF, info->device[target].sof);
 476        fas216_writeb(info, REG_STP, info->device[target].stp);
 477
 478        cntl3 = info->scsi.cfg[2];
 479        if (info->device[target].period >= (200 / 4))
 480                cntl3 = cntl3 & ~CNTL3_FASTSCSI;
 481
 482        fas216_writeb(info, REG_CNTL3, cntl3);
 483}
 484
 485/* Synchronous transfer support
 486 *
 487 * Note: The SCSI II r10 spec says (5.6.12):
 488 *
 489 *  (2)  Due to historical problems with early host adapters that could
 490 *  not accept an SDTR message, some targets may not initiate synchronous
 491 *  negotiation after a power cycle as required by this standard.  Host
 492 *  adapters that support synchronous mode may avoid the ensuing failure
 493 *  modes when the target is independently power cycled by initiating a
 494 *  synchronous negotiation on each REQUEST SENSE and INQUIRY command.
 495 *  This approach increases the SCSI bus overhead and is not recommended
 496 *  for new implementations.  The correct method is to respond to an
 497 *  SDTR message with a MESSAGE REJECT message if the either the
 498 *  initiator or target devices does not support synchronous transfers
 499 *  or does not want to negotiate for synchronous transfers at the time.
 500 *  Using the correct method assures compatibility with wide data
 501 *  transfers and future enhancements.
 502 *
 503 * We will always initiate a synchronous transfer negotiation request on
 504 * every INQUIRY or REQUEST SENSE message, unless the target itself has
 505 * at some point performed a synchronous transfer negotiation request, or
 506 * we have synchronous transfers disabled for this device.
 507 */
 508
 509/**
 510 * fas216_handlesync - Handle a synchronous transfer message
 511 * @info: state structure for interface
 512 * @msg: message from target
 513 *
 514 * Handle a synchronous transfer message from the target
 515 */
 516static void fas216_handlesync(FAS216_Info *info, char *msg)
 517{
 518        struct fas216_device *dev = &info->device[info->SCpnt->device->id];
 519        enum { sync, async, none, reject } res = none;
 520
 521#ifdef SCSI2_SYNC
 522        switch (msg[0]) {
 523        case MESSAGE_REJECT:
 524                /* Synchronous transfer request failed.
 525                 * Note: SCSI II r10:
 526                 *
 527                 *  SCSI devices that are capable of synchronous
 528                 *  data transfers shall not respond to an SDTR
 529                 *  message with a MESSAGE REJECT message.
 530                 *
 531                 * Hence, if we get this condition, we disable
 532                 * negotiation for this device.
 533                 */
 534                if (dev->sync_state == neg_inprogress) {
 535                        dev->sync_state = neg_invalid;
 536                        res = async;
 537                }
 538                break;
 539
 540        case EXTENDED_MESSAGE:
 541                switch (dev->sync_state) {
 542                /* We don't accept synchronous transfer requests.
 543                 * Respond with a MESSAGE_REJECT to prevent a
 544                 * synchronous transfer agreement from being reached.
 545                 */
 546                case neg_invalid:
 547                        res = reject;
 548                        break;
 549
 550                /* We were not negotiating a synchronous transfer,
 551                 * but the device sent us a negotiation request.
 552                 * Honour the request by sending back a SDTR
 553                 * message containing our capability, limited by
 554                 * the targets capability.
 555                 */
 556                default:
 557                        fas216_cmd(info, CMD_SETATN);
 558                        if (msg[4] > info->ifcfg.sync_max_depth)
 559                                msg[4] = info->ifcfg.sync_max_depth;
 560                        if (msg[3] < 1000 / info->ifcfg.clockrate)
 561                                msg[3] = 1000 / info->ifcfg.clockrate;
 562
 563                        msgqueue_flush(&info->scsi.msgs);
 564                        msgqueue_addmsg(&info->scsi.msgs, 5,
 565                                        EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
 566                                        msg[3], msg[4]);
 567                        info->scsi.phase = PHASE_MSGOUT_EXPECT;
 568
 569                        /* This is wrong.  The agreement is not in effect
 570                         * until this message is accepted by the device
 571                         */
 572                        dev->sync_state = neg_targcomplete;
 573                        res = sync;
 574                        break;
 575
 576                /* We initiated the synchronous transfer negotiation,
 577                 * and have successfully received a response from the
 578                 * target.  The synchronous transfer agreement has been
 579                 * reached.  Note: if the values returned are out of our
 580                 * bounds, we must reject the message.
 581                 */
 582                case neg_inprogress:
 583                        res = reject;
 584                        if (msg[4] <= info->ifcfg.sync_max_depth &&
 585                            msg[3] >= 1000 / info->ifcfg.clockrate) {
 586                                dev->sync_state = neg_complete;
 587                                res = sync;
 588                        }
 589                        break;
 590                }
 591        }
 592#else
 593        res = reject;
 594#endif
 595
 596        switch (res) {
 597        case sync:
 598                dev->period = msg[3];
 599                dev->sof    = msg[4];
 600                dev->stp    = fas216_syncperiod(info, msg[3] * 4);
 601                fas216_set_sync(info, info->SCpnt->device->id);
 602                break;
 603
 604        case reject:
 605                fas216_cmd(info, CMD_SETATN);
 606                msgqueue_flush(&info->scsi.msgs);
 607                msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
 608                info->scsi.phase = PHASE_MSGOUT_EXPECT;
 609
 610        case async:
 611                dev->period = info->ifcfg.asyncperiod / 4;
 612                dev->sof    = 0;
 613                dev->stp    = info->scsi.async_stp;
 614                fas216_set_sync(info, info->SCpnt->device->id);
 615                break;
 616
 617        case none:
 618                break;
 619        }
 620}
 621
 622/**
 623 * fas216_updateptrs - update data pointers after transfer suspended/paused
 624 * @info: interface's local pointer to update
 625 * @bytes_transferred: number of bytes transferred
 626 *
 627 * Update data pointers after transfer suspended/paused
 628 */
 629static void fas216_updateptrs(FAS216_Info *info, int bytes_transferred)
 630{
 631        struct scsi_pointer *SCp = &info->scsi.SCp;
 632
 633        fas216_checkmagic(info);
 634
 635        BUG_ON(bytes_transferred < 0);
 636
 637        SCp->phase -= bytes_transferred;
 638
 639        while (bytes_transferred != 0) {
 640                if (SCp->this_residual > bytes_transferred)
 641                        break;
 642                /*
 643                 * We have used up this buffer.  Move on to the
 644                 * next buffer.
 645                 */
 646                bytes_transferred -= SCp->this_residual;
 647                if (!next_SCp(SCp) && bytes_transferred) {
 648                        printk(KERN_WARNING "scsi%d.%c: out of buffers\n",
 649                                info->host->host_no, '0' + info->SCpnt->device->id);
 650                        return;
 651                }
 652        }
 653
 654        SCp->this_residual -= bytes_transferred;
 655        if (SCp->this_residual)
 656                SCp->ptr += bytes_transferred;
 657        else
 658                SCp->ptr = NULL;
 659}
 660
 661/**
 662 * fas216_pio - transfer data off of/on to card using programmed IO
 663 * @info: interface to transfer data to/from
 664 * @direction: direction to transfer data (DMA_OUT/DMA_IN)
 665 *
 666 * Transfer data off of/on to card using programmed IO.
 667 * Notes: this is incredibly slow.
 668 */
 669static void fas216_pio(FAS216_Info *info, fasdmadir_t direction)
 670{
 671        struct scsi_pointer *SCp = &info->scsi.SCp;
 672
 673        fas216_checkmagic(info);
 674
 675        if (direction == DMA_OUT)
 676                fas216_writeb(info, REG_FF, get_next_SCp_byte(SCp));
 677        else
 678                put_next_SCp_byte(SCp, fas216_readb(info, REG_FF));
 679
 680        if (SCp->this_residual == 0)
 681                next_SCp(SCp);
 682}
 683
 684static void fas216_set_stc(FAS216_Info *info, unsigned int length)
 685{
 686        fas216_writeb(info, REG_STCL, length);
 687        fas216_writeb(info, REG_STCM, length >> 8);
 688        fas216_writeb(info, REG_STCH, length >> 16);
 689}
 690
 691static unsigned int fas216_get_ctc(FAS216_Info *info)
 692{
 693        return fas216_readb(info, REG_CTCL) +
 694               (fas216_readb(info, REG_CTCM) << 8) +
 695               (fas216_readb(info, REG_CTCH) << 16);
 696}
 697
 698/**
 699 * fas216_cleanuptransfer - clean up after a transfer has completed.
 700 * @info: interface to clean up
 701 *
 702 * Update the data pointers according to the number of bytes transferred
 703 * on the SCSI bus.
 704 */
 705static void fas216_cleanuptransfer(FAS216_Info *info)
 706{
 707        unsigned long total, residual, fifo;
 708        fasdmatype_t dmatype = info->dma.transfer_type;
 709
 710        info->dma.transfer_type = fasdma_none;
 711
 712        /*
 713         * PIO transfers do not need to be cleaned up.
 714         */
 715        if (dmatype == fasdma_pio || dmatype == fasdma_none)
 716                return;
 717
 718        if (dmatype == fasdma_real_all)
 719                total = info->scsi.SCp.phase;
 720        else
 721                total = info->scsi.SCp.this_residual;
 722
 723        residual = fas216_get_ctc(info);
 724
 725        fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
 726
 727        fas216_log(info, LOG_BUFFER, "cleaning up from previous "
 728                   "transfer: length 0x%06x, residual 0x%x, fifo %d",
 729                   total, residual, fifo);
 730
 731        /*
 732         * If we were performing Data-Out, the transfer counter
 733         * counts down each time a byte is transferred by the
 734         * host to the FIFO.  This means we must include the
 735         * bytes left in the FIFO from the transfer counter.
 736         */
 737        if (info->scsi.phase == PHASE_DATAOUT)
 738                residual += fifo;
 739
 740        fas216_updateptrs(info, total - residual);
 741}
 742
 743/**
 744 * fas216_transfer - Perform a DMA/PIO transfer off of/on to card
 745 * @info: interface from which device disconnected from
 746 *
 747 * Start a DMA/PIO transfer off of/on to card
 748 */
 749static void fas216_transfer(FAS216_Info *info)
 750{
 751        fasdmadir_t direction;
 752        fasdmatype_t dmatype;
 753
 754        fas216_log(info, LOG_BUFFER,
 755                   "starttransfer: buffer %p length 0x%06x reqlen 0x%06x",
 756                   info->scsi.SCp.ptr, info->scsi.SCp.this_residual,
 757                   info->scsi.SCp.phase);
 758
 759        if (!info->scsi.SCp.ptr) {
 760                fas216_log(info, LOG_ERROR, "null buffer passed to "
 761                           "fas216_starttransfer");
 762                print_SCp(&info->scsi.SCp, "SCp: ", "\n");
 763                print_SCp(&info->SCpnt->SCp, "Cmnd SCp: ", "\n");
 764                return;
 765        }
 766
 767        /*
 768         * If we have a synchronous transfer agreement in effect, we must
 769         * use DMA mode.  If we are using asynchronous transfers, we may
 770         * use DMA mode or PIO mode.
 771         */
 772        if (info->device[info->SCpnt->device->id].sof)
 773                dmatype = fasdma_real_all;
 774        else
 775                dmatype = fasdma_pio;
 776
 777        if (info->scsi.phase == PHASE_DATAOUT)
 778                direction = DMA_OUT;
 779        else
 780                direction = DMA_IN;
 781
 782        if (info->dma.setup)
 783                dmatype = info->dma.setup(info->host, &info->scsi.SCp,
 784                                          direction, dmatype);
 785        info->dma.transfer_type = dmatype;
 786
 787        if (dmatype == fasdma_real_all)
 788                fas216_set_stc(info, info->scsi.SCp.phase);
 789        else
 790                fas216_set_stc(info, info->scsi.SCp.this_residual);
 791
 792        switch (dmatype) {
 793        case fasdma_pio:
 794                fas216_log(info, LOG_BUFFER, "PIO transfer");
 795                fas216_writeb(info, REG_SOF, 0);
 796                fas216_writeb(info, REG_STP, info->scsi.async_stp);
 797                fas216_cmd(info, CMD_TRANSFERINFO);
 798                fas216_pio(info, direction);
 799                break;
 800
 801        case fasdma_pseudo:
 802                fas216_log(info, LOG_BUFFER, "pseudo transfer");
 803                fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
 804                info->dma.pseudo(info->host, &info->scsi.SCp,
 805                                 direction, info->SCpnt->transfersize);
 806                break;
 807
 808        case fasdma_real_block:
 809                fas216_log(info, LOG_BUFFER, "block dma transfer");
 810                fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
 811                break;
 812
 813        case fasdma_real_all:
 814                fas216_log(info, LOG_BUFFER, "total dma transfer");
 815                fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
 816                break;
 817
 818        default:
 819                fas216_log(info, LOG_BUFFER | LOG_ERROR,
 820                           "invalid FAS216 DMA type");
 821                break;
 822        }
 823}
 824
 825/**
 826 * fas216_stoptransfer - Stop a DMA transfer onto / off of the card
 827 * @info: interface from which device disconnected from
 828 *
 829 * Called when we switch away from DATA IN or DATA OUT phases.
 830 */
 831static void fas216_stoptransfer(FAS216_Info *info)
 832{
 833        fas216_checkmagic(info);
 834
 835        if (info->dma.transfer_type == fasdma_real_all ||
 836            info->dma.transfer_type == fasdma_real_block)
 837                info->dma.stop(info->host, &info->scsi.SCp);
 838
 839        fas216_cleanuptransfer(info);
 840
 841        if (info->scsi.phase == PHASE_DATAIN) {
 842                unsigned int fifo;
 843
 844                /*
 845                 * If we were performing Data-In, then the FIFO counter
 846                 * contains the number of bytes not transferred via DMA
 847                 * from the on-board FIFO.  Read them manually.
 848                 */
 849                fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
 850                while (fifo && info->scsi.SCp.ptr) {
 851                        *info->scsi.SCp.ptr = fas216_readb(info, REG_FF);
 852                        fas216_updateptrs(info, 1);
 853                        fifo--;
 854                }
 855        } else {
 856                /*
 857                 * After a Data-Out phase, there may be unsent
 858                 * bytes left in the FIFO.  Flush them out.
 859                 */
 860                fas216_cmd(info, CMD_FLUSHFIFO);
 861        }
 862}
 863
 864static void fas216_aborttransfer(FAS216_Info *info)
 865{
 866        fas216_checkmagic(info);
 867
 868        if (info->dma.transfer_type == fasdma_real_all ||
 869            info->dma.transfer_type == fasdma_real_block)
 870                info->dma.stop(info->host, &info->scsi.SCp);
 871
 872        info->dma.transfer_type = fasdma_none;
 873        fas216_cmd(info, CMD_FLUSHFIFO);
 874}
 875
 876static void fas216_kick(FAS216_Info *info);
 877
 878/**
 879 * fas216_disconnected_intr - handle device disconnection
 880 * @info: interface from which device disconnected from
 881 *
 882 * Handle device disconnection
 883 */
 884static void fas216_disconnect_intr(FAS216_Info *info)
 885{
 886        unsigned long flags;
 887
 888        fas216_checkmagic(info);
 889
 890        fas216_log(info, LOG_CONNECT, "disconnect phase=%02x",
 891                   info->scsi.phase);
 892
 893        msgqueue_flush(&info->scsi.msgs);
 894
 895        switch (info->scsi.phase) {
 896        case PHASE_SELECTION:                   /* while selecting - no target          */
 897        case PHASE_SELSTEPS:
 898                fas216_done(info, DID_NO_CONNECT);
 899                break;
 900
 901        case PHASE_MSGIN_DISCONNECT:            /* message in - disconnecting           */
 902                info->scsi.disconnectable = 1;
 903                info->scsi.phase = PHASE_IDLE;
 904                info->stats.disconnects += 1;
 905                spin_lock_irqsave(&info->host_lock, flags);
 906                if (info->scsi.phase == PHASE_IDLE)
 907                        fas216_kick(info);
 908                spin_unlock_irqrestore(&info->host_lock, flags);
 909                break;
 910
 911        case PHASE_DONE:                        /* at end of command - complete         */
 912                fas216_done(info, DID_OK);
 913                break;
 914
 915        case PHASE_MSGOUT:                      /* message out - possible ABORT message */
 916                if (fas216_get_last_msg(info, info->scsi.msgin_fifo) == ABORT) {
 917                        info->scsi.aborting = 0;
 918                        fas216_done(info, DID_ABORT);
 919                        break;
 920                }
 921
 922        default:                                /* huh?                                 */
 923                printk(KERN_ERR "scsi%d.%c: unexpected disconnect in phase %s\n",
 924                        info->host->host_no, fas216_target(info), fas216_drv_phase(info));
 925                print_debug_list();
 926                fas216_stoptransfer(info);
 927                fas216_done(info, DID_ERROR);
 928                break;
 929        }
 930}
 931
 932/**
 933 * fas216_reselected_intr - start reconnection of a device
 934 * @info: interface which was reselected
 935 *
 936 * Start reconnection of a device
 937 */
 938static void
 939fas216_reselected_intr(FAS216_Info *info)
 940{
 941        unsigned int cfis, i;
 942        unsigned char msg[4];
 943        unsigned char target, lun, tag;
 944
 945        fas216_checkmagic(info);
 946
 947        WARN_ON(info->scsi.phase == PHASE_SELECTION ||
 948                info->scsi.phase == PHASE_SELSTEPS);
 949
 950        cfis = fas216_readb(info, REG_CFIS);
 951
 952        fas216_log(info, LOG_CONNECT, "reconnect phase=%02x cfis=%02x",
 953                   info->scsi.phase, cfis);
 954
 955        cfis &= CFIS_CF;
 956
 957        if (cfis < 2 || cfis > 4) {
 958                printk(KERN_ERR "scsi%d.H: incorrect number of bytes after reselect\n",
 959                        info->host->host_no);
 960                goto bad_message;
 961        }
 962
 963        for (i = 0; i < cfis; i++)
 964                msg[i] = fas216_readb(info, REG_FF);
 965
 966        if (!(msg[0] & (1 << info->host->this_id)) ||
 967            !(msg[1] & 0x80))
 968                goto initiator_error;
 969
 970        target = msg[0] & ~(1 << info->host->this_id);
 971        target = ffs(target) - 1;
 972        lun = msg[1] & 7;
 973        tag = 0;
 974
 975        if (cfis >= 3) {
 976                if (msg[2] != SIMPLE_QUEUE_TAG)
 977                        goto initiator_error;
 978
 979                tag = msg[3];
 980        }
 981
 982        /* set up for synchronous transfers */
 983        fas216_writeb(info, REG_SDID, target);
 984        fas216_set_sync(info, target);
 985        msgqueue_flush(&info->scsi.msgs);
 986
 987        fas216_log(info, LOG_CONNECT, "Reconnected: target %1x lun %1x tag %02x",
 988                   target, lun, tag);
 989
 990        if (info->scsi.disconnectable && info->SCpnt) {
 991                info->scsi.disconnectable = 0;
 992                if (info->SCpnt->device->id  == target &&
 993                    info->SCpnt->device->lun == lun &&
 994                    info->SCpnt->tag         == tag) {
 995                        fas216_log(info, LOG_CONNECT, "reconnected previously executing command");
 996                } else {
 997                        queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
 998                        fas216_log(info, LOG_CONNECT, "had to move command to disconnected queue");
 999                        info->SCpnt = NULL;
1000                }
1001        }
1002        if (!info->SCpnt) {
1003                info->SCpnt = queue_remove_tgtluntag(&info->queues.disconnected,
1004                                        target, lun, tag);
1005                fas216_log(info, LOG_CONNECT, "had to get command");
1006        }
1007
1008        if (info->SCpnt) {
1009                /*
1010                 * Restore data pointer from SAVED data pointer
1011                 */
1012                info->scsi.SCp = info->SCpnt->SCp;
1013
1014                fas216_log(info, LOG_CONNECT, "data pointers: [%p, %X]",
1015                        info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1016                info->scsi.phase = PHASE_MSGIN;
1017        } else {
1018                /*
1019                 * Our command structure not found - abort the
1020                 * command on the target.  Since we have no
1021                 * record of this command, we can't send
1022                 * an INITIATOR DETECTED ERROR message.
1023                 */
1024                fas216_cmd(info, CMD_SETATN);
1025
1026#if 0
1027                if (tag)
1028                        msgqueue_addmsg(&info->scsi.msgs, 2, ABORT_TAG, tag);
1029                else
1030#endif
1031                        msgqueue_addmsg(&info->scsi.msgs, 1, ABORT);
1032                info->scsi.phase = PHASE_MSGOUT_EXPECT;
1033                info->scsi.aborting = 1;
1034        }
1035
1036        fas216_cmd(info, CMD_MSGACCEPTED);
1037        return;
1038
1039 initiator_error:
1040        printk(KERN_ERR "scsi%d.H: error during reselection: bytes",
1041                info->host->host_no);
1042        for (i = 0; i < cfis; i++)
1043                printk(" %02x", msg[i]);
1044        printk("\n");
1045 bad_message:
1046        fas216_cmd(info, CMD_SETATN);
1047        msgqueue_flush(&info->scsi.msgs);
1048        msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1049        info->scsi.phase = PHASE_MSGOUT_EXPECT;
1050        fas216_cmd(info, CMD_MSGACCEPTED);
1051}
1052
1053static void fas216_parse_message(FAS216_Info *info, unsigned char *message, int msglen)
1054{
1055        int i;
1056
1057        switch (message[0]) {
1058        case COMMAND_COMPLETE:
1059                if (msglen != 1)
1060                        goto unrecognised;
1061
1062                printk(KERN_ERR "scsi%d.%c: command complete with no "
1063                        "status in MESSAGE_IN?\n",
1064                        info->host->host_no, fas216_target(info));
1065                break;
1066
1067        case SAVE_POINTERS:
1068                if (msglen != 1)
1069                        goto unrecognised;
1070
1071                /*
1072                 * Save current data pointer to SAVED data pointer
1073                 * SCSI II standard says that we must not acknowledge
1074                 * this until we have really saved pointers.
1075                 * NOTE: we DO NOT save the command nor status pointers
1076                 * as required by the SCSI II standard.  These always
1077                 * point to the start of their respective areas.
1078                 */
1079                info->SCpnt->SCp = info->scsi.SCp;
1080                info->SCpnt->SCp.sent_command = 0;
1081                fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
1082                        "save data pointers: [%p, %X]",
1083                        info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1084                break;
1085
1086        case RESTORE_POINTERS:
1087                if (msglen != 1)
1088                        goto unrecognised;
1089
1090                /*
1091                 * Restore current data pointer from SAVED data pointer
1092                 */
1093                info->scsi.SCp = info->SCpnt->SCp;
1094                fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
1095                        "restore data pointers: [%p, 0x%x]",
1096                        info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1097                break;
1098
1099        case DISCONNECT:
1100                if (msglen != 1)
1101                        goto unrecognised;
1102
1103                info->scsi.phase = PHASE_MSGIN_DISCONNECT;
1104                break;
1105
1106        case MESSAGE_REJECT:
1107                if (msglen != 1)
1108                        goto unrecognised;
1109
1110                switch (fas216_get_last_msg(info, info->scsi.msgin_fifo)) {
1111                case EXTENDED_MESSAGE | EXTENDED_SDTR << 8:
1112                        fas216_handlesync(info, message);
1113                        break;
1114
1115                default:
1116                        fas216_log(info, 0, "reject, last message 0x%04x",
1117                                fas216_get_last_msg(info, info->scsi.msgin_fifo));
1118                }
1119                break;
1120
1121        case NOP:
1122                break;
1123
1124        case EXTENDED_MESSAGE:
1125                if (msglen < 3)
1126                        goto unrecognised;
1127
1128                switch (message[2]) {
1129                case EXTENDED_SDTR:     /* Sync transfer negotiation request/reply */
1130                        fas216_handlesync(info, message);
1131                        break;
1132
1133                default:
1134                        goto unrecognised;
1135                }
1136                break;
1137
1138        default:
1139                goto unrecognised;
1140        }
1141        return;
1142
1143unrecognised:
1144        fas216_log(info, 0, "unrecognised message, rejecting");
1145        printk("scsi%d.%c: message was", info->host->host_no, fas216_target(info));
1146        for (i = 0; i < msglen; i++)
1147                printk("%s%02X", i & 31 ? " " : "\n  ", message[i]);
1148        printk("\n");
1149
1150        /*
1151         * Something strange seems to be happening here -
1152         * I can't use SETATN since the chip gives me an
1153         * invalid command interrupt when I do.  Weird.
1154         */
1155fas216_cmd(info, CMD_NOP);
1156fas216_dumpstate(info);
1157        fas216_cmd(info, CMD_SETATN);
1158        msgqueue_flush(&info->scsi.msgs);
1159        msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
1160        info->scsi.phase = PHASE_MSGOUT_EXPECT;
1161fas216_dumpstate(info);
1162}
1163
1164static int fas216_wait_cmd(FAS216_Info *info, int cmd)
1165{
1166        int tout;
1167        int stat;
1168
1169        fas216_cmd(info, cmd);
1170
1171        for (tout = 1000; tout; tout -= 1) {
1172                stat = fas216_readb(info, REG_STAT);
1173                if (stat & (STAT_INT|STAT_PARITYERROR))
1174                        break;
1175                udelay(1);
1176        }
1177
1178        return stat;
1179}
1180
1181static int fas216_get_msg_byte(FAS216_Info *info)
1182{
1183        unsigned int stat = fas216_wait_cmd(info, CMD_MSGACCEPTED);
1184
1185        if ((stat & STAT_INT) == 0)
1186                goto timedout;
1187
1188        if ((stat & STAT_BUSMASK) != STAT_MESGIN)
1189                goto unexpected_phase_change;
1190
1191        fas216_readb(info, REG_INST);
1192
1193        stat = fas216_wait_cmd(info, CMD_TRANSFERINFO);
1194
1195        if ((stat & STAT_INT) == 0)
1196                goto timedout;
1197
1198        if (stat & STAT_PARITYERROR)
1199                goto parity_error;
1200
1201        if ((stat & STAT_BUSMASK) != STAT_MESGIN)
1202                goto unexpected_phase_change;
1203
1204        fas216_readb(info, REG_INST);
1205
1206        return fas216_readb(info, REG_FF);
1207
1208timedout:
1209        fas216_log(info, LOG_ERROR, "timed out waiting for message byte");
1210        return -1;
1211
1212unexpected_phase_change:
1213        fas216_log(info, LOG_ERROR, "unexpected phase change: status = %02x", stat);
1214        return -2;
1215
1216parity_error:
1217        fas216_log(info, LOG_ERROR, "parity error during message in phase");
1218        return -3;
1219}
1220
1221/**
1222 * fas216_message - handle a function done interrupt from FAS216 chip
1223 * @info: interface which caused function done interrupt
1224 *
1225 * Handle a function done interrupt from FAS216 chip
1226 */
1227static void fas216_message(FAS216_Info *info)
1228{
1229        unsigned char *message = info->scsi.message;
1230        unsigned int msglen = 1;
1231        int msgbyte = 0;
1232
1233        fas216_checkmagic(info);
1234
1235        message[0] = fas216_readb(info, REG_FF);
1236
1237        if (message[0] == EXTENDED_MESSAGE) {
1238                msgbyte = fas216_get_msg_byte(info);
1239
1240                if (msgbyte >= 0) {
1241                        message[1] = msgbyte;
1242
1243                        for (msglen = 2; msglen < message[1] + 2; msglen++) {
1244                                msgbyte = fas216_get_msg_byte(info);
1245
1246                                if (msgbyte >= 0)
1247                                        message[msglen] = msgbyte;
1248                                else
1249                                        break;
1250                        }
1251                }
1252        }
1253
1254        if (msgbyte == -3)
1255                goto parity_error;
1256
1257#ifdef DEBUG_MESSAGES
1258        {
1259                int i;
1260
1261                printk("scsi%d.%c: message in: ",
1262                        info->host->host_no, fas216_target(info));
1263                for (i = 0; i < msglen; i++)
1264                        printk("%02X ", message[i]);
1265                printk("\n");
1266        }
1267#endif
1268
1269        fas216_parse_message(info, message, msglen);
1270        fas216_cmd(info, CMD_MSGACCEPTED);
1271        return;
1272
1273parity_error:
1274        fas216_cmd(info, CMD_SETATN);
1275        msgqueue_flush(&info->scsi.msgs);
1276        msgqueue_addmsg(&info->scsi.msgs, 1, MSG_PARITY_ERROR);
1277        info->scsi.phase = PHASE_MSGOUT_EXPECT;
1278        fas216_cmd(info, CMD_MSGACCEPTED);
1279        return;
1280}
1281
1282/**
1283 * fas216_send_command - send command after all message bytes have been sent
1284 * @info: interface which caused bus service
1285 *
1286 * Send a command to a target after all message bytes have been sent
1287 */
1288static void fas216_send_command(FAS216_Info *info)
1289{
1290        int i;
1291
1292        fas216_checkmagic(info);
1293
1294        fas216_cmd(info, CMD_NOP|CMD_WITHDMA);
1295        fas216_cmd(info, CMD_FLUSHFIFO);
1296
1297        /* load command */
1298        for (i = info->scsi.SCp.sent_command; i < info->SCpnt->cmd_len; i++)
1299                fas216_writeb(info, REG_FF, info->SCpnt->cmnd[i]);
1300
1301        fas216_cmd(info, CMD_TRANSFERINFO);
1302
1303        info->scsi.phase = PHASE_COMMAND;
1304}
1305
1306/**
1307 * fas216_send_messageout - handle bus service to send a message
1308 * @info: interface which caused bus service
1309 *
1310 * Handle bus service to send a message.
1311 * Note: We do not allow the device to change the data direction!
1312 */
1313static void fas216_send_messageout(FAS216_Info *info, int start)
1314{
1315        unsigned int tot_msglen = msgqueue_msglength(&info->scsi.msgs);
1316
1317        fas216_checkmagic(info);
1318
1319        fas216_cmd(info, CMD_FLUSHFIFO);
1320
1321        if (tot_msglen) {
1322                struct message *msg;
1323                int msgnr = 0;
1324
1325                while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1326                        int i;
1327
1328                        for (i = start; i < msg->length; i++)
1329                                fas216_writeb(info, REG_FF, msg->msg[i]);
1330
1331                        msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
1332                        start = 0;
1333                }
1334        } else
1335                fas216_writeb(info, REG_FF, NOP);
1336
1337        fas216_cmd(info, CMD_TRANSFERINFO);
1338
1339        info->scsi.phase = PHASE_MSGOUT;
1340}
1341
1342/**
1343 * fas216_busservice_intr - handle bus service interrupt from FAS216 chip
1344 * @info: interface which caused bus service interrupt
1345 * @stat: Status register contents
1346 * @is: SCSI Status register contents
1347 *
1348 * Handle a bus service interrupt from FAS216 chip
1349 */
1350static void fas216_busservice_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
1351{
1352        fas216_checkmagic(info);
1353
1354        fas216_log(info, LOG_BUSSERVICE,
1355                   "bus service: stat=%02x is=%02x phase=%02x",
1356                   stat, is, info->scsi.phase);
1357
1358        switch (info->scsi.phase) {
1359        case PHASE_SELECTION:
1360                if ((is & IS_BITS) != IS_MSGBYTESENT)
1361                        goto bad_is;
1362                break;
1363
1364        case PHASE_SELSTEPS:
1365                switch (is & IS_BITS) {
1366                case IS_SELARB:
1367                case IS_MSGBYTESENT:
1368                        goto bad_is;
1369
1370                case IS_NOTCOMMAND:
1371                case IS_EARLYPHASE:
1372                        if ((stat & STAT_BUSMASK) == STAT_MESGIN)
1373                                break;
1374                        goto bad_is;
1375
1376                case IS_COMPLETE:
1377                        break;
1378                }
1379
1380        default:
1381                break;
1382        }
1383
1384        fas216_cmd(info, CMD_NOP);
1385
1386#define STATE(st,ph) ((ph) << 3 | (st))
1387        /* This table describes the legal SCSI state transitions,
1388         * as described by the SCSI II spec.
1389         */
1390        switch (STATE(stat & STAT_BUSMASK, info->scsi.phase)) {
1391        case STATE(STAT_DATAIN, PHASE_SELSTEPS):/* Sel w/ steps -> Data In      */
1392        case STATE(STAT_DATAIN, PHASE_MSGOUT):  /* Message Out  -> Data In      */
1393        case STATE(STAT_DATAIN, PHASE_COMMAND): /* Command      -> Data In      */
1394        case STATE(STAT_DATAIN, PHASE_MSGIN):   /* Message In   -> Data In      */
1395                info->scsi.phase = PHASE_DATAIN;
1396                fas216_transfer(info);
1397                return;
1398
1399        case STATE(STAT_DATAIN, PHASE_DATAIN):  /* Data In      -> Data In      */
1400        case STATE(STAT_DATAOUT, PHASE_DATAOUT):/* Data Out     -> Data Out     */
1401                fas216_cleanuptransfer(info);
1402                fas216_transfer(info);
1403                return;
1404
1405        case STATE(STAT_DATAOUT, PHASE_SELSTEPS):/* Sel w/ steps-> Data Out     */
1406        case STATE(STAT_DATAOUT, PHASE_MSGOUT): /* Message Out  -> Data Out     */
1407        case STATE(STAT_DATAOUT, PHASE_COMMAND):/* Command      -> Data Out     */
1408        case STATE(STAT_DATAOUT, PHASE_MSGIN):  /* Message In   -> Data Out     */
1409                fas216_cmd(info, CMD_FLUSHFIFO);
1410                info->scsi.phase = PHASE_DATAOUT;
1411                fas216_transfer(info);
1412                return;
1413
1414        case STATE(STAT_STATUS, PHASE_DATAOUT): /* Data Out     -> Status       */
1415        case STATE(STAT_STATUS, PHASE_DATAIN):  /* Data In      -> Status       */
1416                fas216_stoptransfer(info);
1417        case STATE(STAT_STATUS, PHASE_SELSTEPS):/* Sel w/ steps -> Status       */
1418        case STATE(STAT_STATUS, PHASE_MSGOUT):  /* Message Out  -> Status       */
1419        case STATE(STAT_STATUS, PHASE_COMMAND): /* Command      -> Status       */
1420        case STATE(STAT_STATUS, PHASE_MSGIN):   /* Message In   -> Status       */
1421                fas216_cmd(info, CMD_INITCMDCOMPLETE);
1422                info->scsi.phase = PHASE_STATUS;
1423                return;
1424
1425        case STATE(STAT_MESGIN, PHASE_DATAOUT): /* Data Out     -> Message In   */
1426        case STATE(STAT_MESGIN, PHASE_DATAIN):  /* Data In      -> Message In   */
1427                fas216_stoptransfer(info);
1428        case STATE(STAT_MESGIN, PHASE_COMMAND): /* Command      -> Message In   */
1429        case STATE(STAT_MESGIN, PHASE_SELSTEPS):/* Sel w/ steps -> Message In   */
1430        case STATE(STAT_MESGIN, PHASE_MSGOUT):  /* Message Out  -> Message In   */
1431                info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
1432                fas216_cmd(info, CMD_FLUSHFIFO);
1433                fas216_cmd(info, CMD_TRANSFERINFO);
1434                info->scsi.phase = PHASE_MSGIN;
1435                return;
1436
1437        case STATE(STAT_MESGIN, PHASE_MSGIN):
1438                info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
1439                fas216_cmd(info, CMD_TRANSFERINFO);
1440                return;
1441
1442        case STATE(STAT_COMMAND, PHASE_MSGOUT): /* Message Out  -> Command      */
1443        case STATE(STAT_COMMAND, PHASE_MSGIN):  /* Message In   -> Command      */
1444                fas216_send_command(info);
1445                info->scsi.phase = PHASE_COMMAND;
1446                return;
1447
1448
1449        /*
1450         * Selection    -> Message Out
1451         */
1452        case STATE(STAT_MESGOUT, PHASE_SELECTION):
1453                fas216_send_messageout(info, 1);
1454                return;
1455
1456        /*
1457         * Message Out  -> Message Out
1458         */
1459        case STATE(STAT_MESGOUT, PHASE_SELSTEPS):
1460        case STATE(STAT_MESGOUT, PHASE_MSGOUT):
1461                /*
1462                 * If we get another message out phase, this usually
1463                 * means some parity error occurred.  Resend complete
1464                 * set of messages.  If we have more than one byte to
1465                 * send, we need to assert ATN again.
1466                 */
1467                if (info->device[info->SCpnt->device->id].parity_check) {
1468                        /*
1469                         * We were testing... good, the device
1470                         * supports parity checking.
1471                         */
1472                        info->device[info->SCpnt->device->id].parity_check = 0;
1473                        info->device[info->SCpnt->device->id].parity_enabled = 1;
1474                        fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
1475                }
1476
1477                if (msgqueue_msglength(&info->scsi.msgs) > 1)
1478                        fas216_cmd(info, CMD_SETATN);
1479                /*FALLTHROUGH*/
1480
1481        /*
1482         * Any          -> Message Out
1483         */
1484        case STATE(STAT_MESGOUT, PHASE_MSGOUT_EXPECT):
1485                fas216_send_messageout(info, 0);
1486                return;
1487
1488        /* Error recovery rules.
1489         *   These either attempt to abort or retry the operation.
1490         * TODO: we need more of these
1491         */
1492        case STATE(STAT_COMMAND, PHASE_COMMAND):/* Command      -> Command      */
1493                /* error - we've sent out all the command bytes
1494                 * we have.
1495                 * NOTE: we need SAVE DATA POINTERS/RESTORE DATA POINTERS
1496                 * to include the command bytes sent for this to work
1497                 * correctly.
1498                 */
1499                printk(KERN_ERR "scsi%d.%c: "
1500                        "target trying to receive more command bytes\n",
1501                        info->host->host_no, fas216_target(info));
1502                fas216_cmd(info, CMD_SETATN);
1503                fas216_set_stc(info, 15);
1504                fas216_cmd(info, CMD_PADBYTES | CMD_WITHDMA);
1505                msgqueue_flush(&info->scsi.msgs);
1506                msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1507                info->scsi.phase = PHASE_MSGOUT_EXPECT;
1508                return;
1509        }
1510
1511        if (info->scsi.phase == PHASE_MSGIN_DISCONNECT) {
1512                printk(KERN_ERR "scsi%d.%c: disconnect message received, but bus service %s?\n",
1513                        info->host->host_no, fas216_target(info),
1514                        fas216_bus_phase(stat));
1515                msgqueue_flush(&info->scsi.msgs);
1516                fas216_cmd(info, CMD_SETATN);
1517                msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1518                info->scsi.phase = PHASE_MSGOUT_EXPECT;
1519                info->scsi.aborting = 1;
1520                fas216_cmd(info, CMD_TRANSFERINFO);
1521                return;
1522        }
1523        printk(KERN_ERR "scsi%d.%c: bus phase %s after %s?\n",
1524                info->host->host_no, fas216_target(info),
1525                fas216_bus_phase(stat),
1526                fas216_drv_phase(info));
1527        print_debug_list();
1528        return;
1529
1530bad_is:
1531        fas216_log(info, 0, "bus service at step %d?", is & IS_BITS);
1532        fas216_dumpstate(info);
1533        print_debug_list();
1534
1535        fas216_done(info, DID_ERROR);
1536}
1537
1538/**
1539 * fas216_funcdone_intr - handle a function done interrupt from FAS216 chip
1540 * @info: interface which caused function done interrupt
1541 * @stat: Status register contents
1542 * @is: SCSI Status register contents
1543 *
1544 * Handle a function done interrupt from FAS216 chip
1545 */
1546static void fas216_funcdone_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
1547{
1548        unsigned int fifo_len = fas216_readb(info, REG_CFIS) & CFIS_CF;
1549
1550        fas216_checkmagic(info);
1551
1552        fas216_log(info, LOG_FUNCTIONDONE,
1553                   "function done: stat=%02x is=%02x phase=%02x",
1554                   stat, is, info->scsi.phase);
1555
1556        switch (info->scsi.phase) {
1557        case PHASE_STATUS:                      /* status phase - read status and msg   */
1558                if (fifo_len != 2) {
1559                        fas216_log(info, 0, "odd number of bytes in FIFO: %d", fifo_len);
1560                }
1561                /*
1562                 * Read status then message byte.
1563                 */
1564                info->scsi.SCp.Status = fas216_readb(info, REG_FF);
1565                info->scsi.SCp.Message = fas216_readb(info, REG_FF);
1566                info->scsi.phase = PHASE_DONE;
1567                fas216_cmd(info, CMD_MSGACCEPTED);
1568                break;
1569
1570        case PHASE_IDLE:
1571        case PHASE_SELECTION:
1572        case PHASE_SELSTEPS:
1573                break;
1574
1575        case PHASE_MSGIN:                       /* message in phase                     */
1576                if ((stat & STAT_BUSMASK) == STAT_MESGIN) {
1577                        info->scsi.msgin_fifo = fifo_len;
1578                        fas216_message(info);
1579                        break;
1580                }
1581
1582        default:
1583                fas216_log(info, 0, "internal phase %s for function done?"
1584                        "  What do I do with this?",
1585                        fas216_target(info), fas216_drv_phase(info));
1586        }
1587}
1588
1589static void fas216_bus_reset(FAS216_Info *info)
1590{
1591        neg_t sync_state;
1592        int i;
1593
1594        msgqueue_flush(&info->scsi.msgs);
1595
1596        sync_state = neg_invalid;
1597
1598#ifdef SCSI2_SYNC
1599        if (info->ifcfg.capabilities & (FASCAP_DMA|FASCAP_PSEUDODMA))
1600                sync_state = neg_wait;
1601#endif
1602
1603        info->scsi.phase = PHASE_IDLE;
1604        info->SCpnt = NULL; /* bug! */
1605        memset(&info->scsi.SCp, 0, sizeof(info->scsi.SCp));
1606
1607        for (i = 0; i < 8; i++) {
1608                info->device[i].disconnect_ok   = info->ifcfg.disconnect_ok;
1609                info->device[i].sync_state      = sync_state;
1610                info->device[i].period          = info->ifcfg.asyncperiod / 4;
1611                info->device[i].stp             = info->scsi.async_stp;
1612                info->device[i].sof             = 0;
1613                info->device[i].wide_xfer       = 0;
1614        }
1615
1616        info->rst_bus_status = 1;
1617        wake_up(&info->eh_wait);
1618}
1619
1620/**
1621 * fas216_intr - handle interrupts to progress a command
1622 * @info: interface to service
1623 *
1624 * Handle interrupts from the interface to progress a command
1625 */
1626irqreturn_t fas216_intr(FAS216_Info *info)
1627{
1628        unsigned char inst, is, stat;
1629        int handled = IRQ_NONE;
1630
1631        fas216_checkmagic(info);
1632
1633        stat = fas216_readb(info, REG_STAT);
1634        is = fas216_readb(info, REG_IS);
1635        inst = fas216_readb(info, REG_INST);
1636
1637        add_debug_list(stat, is, inst, info->scsi.phase);
1638
1639        if (stat & STAT_INT) {
1640                if (inst & INST_BUSRESET) {
1641                        fas216_log(info, 0, "bus reset detected");
1642                        fas216_bus_reset(info);
1643                        scsi_report_bus_reset(info->host, 0);
1644                } else if (inst & INST_ILLEGALCMD) {
1645                        fas216_log(info, LOG_ERROR, "illegal command given\n");
1646                        fas216_dumpstate(info);
1647                        print_debug_list();
1648                } else if (inst & INST_DISCONNECT)
1649                        fas216_disconnect_intr(info);
1650                else if (inst & INST_RESELECTED)        /* reselected                   */
1651                        fas216_reselected_intr(info);
1652                else if (inst & INST_BUSSERVICE)        /* bus service request          */
1653                        fas216_busservice_intr(info, stat, is);
1654                else if (inst & INST_FUNCDONE)          /* function done                */
1655                        fas216_funcdone_intr(info, stat, is);
1656                else
1657                        fas216_log(info, 0, "unknown interrupt received:"
1658                                " phase %s inst %02X is %02X stat %02X",
1659                                fas216_drv_phase(info), inst, is, stat);
1660                handled = IRQ_HANDLED;
1661        }
1662        return handled;
1663}
1664
1665static void __fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1666{
1667        int tot_msglen;
1668
1669        /* following what the ESP driver says */
1670        fas216_set_stc(info, 0);
1671        fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
1672
1673        /* flush FIFO */
1674        fas216_cmd(info, CMD_FLUSHFIFO);
1675
1676        /* load bus-id and timeout */
1677        fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
1678        fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
1679
1680        /* synchronous transfers */
1681        fas216_set_sync(info, SCpnt->device->id);
1682
1683        tot_msglen = msgqueue_msglength(&info->scsi.msgs);
1684
1685#ifdef DEBUG_MESSAGES
1686        {
1687                struct message *msg;
1688                int msgnr = 0, i;
1689
1690                printk("scsi%d.%c: message out: ",
1691                        info->host->host_no, '0' + SCpnt->device->id);
1692                while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1693                        printk("{ ");
1694                        for (i = 0; i < msg->length; i++)
1695                                printk("%02x ", msg->msg[i]);
1696                        printk("} ");
1697                }
1698                printk("\n");
1699        }
1700#endif
1701
1702        if (tot_msglen == 1 || tot_msglen == 3) {
1703                /*
1704                 * We have an easy message length to send...
1705                 */
1706                struct message *msg;
1707                int msgnr = 0, i;
1708
1709                info->scsi.phase = PHASE_SELSTEPS;
1710
1711                /* load message bytes */
1712                while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1713                        for (i = 0; i < msg->length; i++)
1714                                fas216_writeb(info, REG_FF, msg->msg[i]);
1715                        msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
1716                }
1717
1718                /* load command */
1719                for (i = 0; i < SCpnt->cmd_len; i++)
1720                        fas216_writeb(info, REG_FF, SCpnt->cmnd[i]);
1721
1722                if (tot_msglen == 1)
1723                        fas216_cmd(info, CMD_SELECTATN);
1724                else
1725                        fas216_cmd(info, CMD_SELECTATN3);
1726        } else {
1727                /*
1728                 * We have an unusual number of message bytes to send.
1729                 *  Load first byte into fifo, and issue SELECT with ATN and
1730                 *  stop steps.
1731                 */
1732                struct message *msg = msgqueue_getmsg(&info->scsi.msgs, 0);
1733
1734                fas216_writeb(info, REG_FF, msg->msg[0]);
1735                msg->fifo = 1;
1736
1737                fas216_cmd(info, CMD_SELECTATNSTOP);
1738        }
1739}
1740
1741/*
1742 * Decide whether we need to perform a parity test on this device.
1743 * Can also be used to force parity error conditions during initial
1744 * information transfer phase (message out) for test purposes.
1745 */
1746static int parity_test(FAS216_Info *info, int target)
1747{
1748#if 0
1749        if (target == 3) {
1750                info->device[target].parity_check = 0;
1751                return 1;
1752        }
1753#endif
1754        return info->device[target].parity_check;
1755}
1756
1757static void fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1758{
1759        int disconnect_ok;
1760
1761        /*
1762         * claim host busy
1763         */
1764        info->scsi.phase = PHASE_SELECTION;
1765        info->scsi.SCp = SCpnt->SCp;
1766        info->SCpnt = SCpnt;
1767        info->dma.transfer_type = fasdma_none;
1768
1769        if (parity_test(info, SCpnt->device->id))
1770                fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_PTE);
1771        else
1772                fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
1773
1774        /*
1775         * Don't allow request sense commands to disconnect.
1776         */
1777        disconnect_ok = SCpnt->cmnd[0] != REQUEST_SENSE &&
1778                        info->device[SCpnt->device->id].disconnect_ok;
1779
1780        /*
1781         * build outgoing message bytes
1782         */
1783        msgqueue_flush(&info->scsi.msgs);
1784        msgqueue_addmsg(&info->scsi.msgs, 1, IDENTIFY(disconnect_ok, SCpnt->device->lun));
1785
1786        /*
1787         * add tag message if required
1788         */
1789        if (SCpnt->tag)
1790                msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG, SCpnt->tag);
1791
1792        do {
1793#ifdef SCSI2_SYNC
1794                if ((info->device[SCpnt->device->id].sync_state == neg_wait ||
1795                     info->device[SCpnt->device->id].sync_state == neg_complete) &&
1796                    (SCpnt->cmnd[0] == REQUEST_SENSE ||
1797                     SCpnt->cmnd[0] == INQUIRY)) {
1798                        info->device[SCpnt->device->id].sync_state = neg_inprogress;
1799                        msgqueue_addmsg(&info->scsi.msgs, 5,
1800                                        EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
1801                                        1000 / info->ifcfg.clockrate,
1802                                        info->ifcfg.sync_max_depth);
1803                        break;
1804                }
1805#endif
1806        } while (0);
1807
1808        __fas216_start_command(info, SCpnt);
1809}
1810
1811static void fas216_allocate_tag(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1812{
1813#ifdef SCSI2_TAG
1814        /*
1815         * tagged queuing - allocate a new tag to this command
1816         */
1817        if (SCpnt->device->simple_tags && SCpnt->cmnd[0] != REQUEST_SENSE &&
1818            SCpnt->cmnd[0] != INQUIRY) {
1819            SCpnt->device->current_tag += 1;
1820                if (SCpnt->device->current_tag == 0)
1821                    SCpnt->device->current_tag = 1;
1822                        SCpnt->tag = SCpnt->device->current_tag;
1823        } else
1824#endif
1825                set_bit(SCpnt->device->id * 8 +
1826                        (u8)(SCpnt->device->lun & 0x7), info->busyluns);
1827
1828        info->stats.removes += 1;
1829        switch (SCpnt->cmnd[0]) {
1830        case WRITE_6:
1831        case WRITE_10:
1832        case WRITE_12:
1833                info->stats.writes += 1;
1834                break;
1835        case READ_6:
1836        case READ_10:
1837        case READ_12:
1838                info->stats.reads += 1;
1839                break;
1840        default:
1841                info->stats.miscs += 1;
1842                break;
1843        }
1844}
1845
1846static void fas216_do_bus_device_reset(FAS216_Info *info,
1847                                       struct scsi_cmnd *SCpnt)
1848{
1849        struct message *msg;
1850
1851        /*
1852         * claim host busy
1853         */
1854        info->scsi.phase = PHASE_SELECTION;
1855        info->scsi.SCp = SCpnt->SCp;
1856        info->SCpnt = SCpnt;
1857        info->dma.transfer_type = fasdma_none;
1858
1859        fas216_log(info, LOG_ERROR, "sending bus device reset");
1860
1861        msgqueue_flush(&info->scsi.msgs);
1862        msgqueue_addmsg(&info->scsi.msgs, 1, BUS_DEVICE_RESET);
1863
1864        /* following what the ESP driver says */
1865        fas216_set_stc(info, 0);
1866        fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
1867
1868        /* flush FIFO */
1869        fas216_cmd(info, CMD_FLUSHFIFO);
1870
1871        /* load bus-id and timeout */
1872        fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
1873        fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
1874
1875        /* synchronous transfers */
1876        fas216_set_sync(info, SCpnt->device->id);
1877
1878        msg = msgqueue_getmsg(&info->scsi.msgs, 0);
1879
1880        fas216_writeb(info, REG_FF, BUS_DEVICE_RESET);
1881        msg->fifo = 1;
1882
1883        fas216_cmd(info, CMD_SELECTATNSTOP);
1884}
1885
1886/**
1887 * fas216_kick - kick a command to the interface
1888 * @info: our host interface to kick
1889 *
1890 * Kick a command to the interface, interface should be idle.
1891 * Notes: Interrupts are always disabled!
1892 */
1893static void fas216_kick(FAS216_Info *info)
1894{
1895        struct scsi_cmnd *SCpnt = NULL;
1896#define TYPE_OTHER      0
1897#define TYPE_RESET      1
1898#define TYPE_QUEUE      2
1899        int where_from = TYPE_OTHER;
1900
1901        fas216_checkmagic(info);
1902
1903        /*
1904         * Obtain the next command to process.
1905         */
1906        do {
1907                if (info->rstSCpnt) {
1908                        SCpnt = info->rstSCpnt;
1909                        /* don't remove it */
1910                        where_from = TYPE_RESET;
1911                        break;
1912                }
1913
1914                if (info->reqSCpnt) {
1915                        SCpnt = info->reqSCpnt;
1916                        info->reqSCpnt = NULL;
1917                        break;
1918                }
1919
1920                if (info->origSCpnt) {
1921                        SCpnt = info->origSCpnt;
1922                        info->origSCpnt = NULL;
1923                        break;
1924                }
1925
1926                /* retrieve next command */
1927                if (!SCpnt) {
1928                        SCpnt = queue_remove_exclude(&info->queues.issue,
1929                                                     info->busyluns);
1930                        where_from = TYPE_QUEUE;
1931                        break;
1932                }
1933        } while (0);
1934
1935        if (!SCpnt) {
1936                /*
1937                 * no command pending, so enable reselection.
1938                 */
1939                fas216_cmd(info, CMD_ENABLESEL);
1940                return;
1941        }
1942
1943        /*
1944         * We're going to start a command, so disable reselection
1945         */
1946        fas216_cmd(info, CMD_DISABLESEL);
1947
1948        if (info->scsi.disconnectable && info->SCpnt) {
1949                fas216_log(info, LOG_CONNECT,
1950                        "moved command for %d to disconnected queue",
1951                        info->SCpnt->device->id);
1952                queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
1953                info->scsi.disconnectable = 0;
1954                info->SCpnt = NULL;
1955        }
1956
1957        fas216_log_command(info, LOG_CONNECT | LOG_MESSAGES, SCpnt,
1958                           "starting");
1959
1960        switch (where_from) {
1961        case TYPE_QUEUE:
1962                fas216_allocate_tag(info, SCpnt);
1963        case TYPE_OTHER:
1964                fas216_start_command(info, SCpnt);
1965                break;
1966        case TYPE_RESET:
1967                fas216_do_bus_device_reset(info, SCpnt);
1968                break;
1969        }
1970
1971        fas216_log(info, LOG_CONNECT, "select: data pointers [%p, %X]",
1972                info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1973
1974        /*
1975         * should now get either DISCONNECT or
1976         * (FUNCTION DONE with BUS SERVICE) interrupt
1977         */
1978}
1979
1980/*
1981 * Clean up from issuing a BUS DEVICE RESET message to a device.
1982 */
1983static void fas216_devicereset_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
1984                                    unsigned int result)
1985{
1986        fas216_log(info, LOG_ERROR, "fas216 device reset complete");
1987
1988        info->rstSCpnt = NULL;
1989        info->rst_dev_status = 1;
1990        wake_up(&info->eh_wait);
1991}
1992
1993/**
1994 * fas216_rq_sns_done - Finish processing automatic request sense command
1995 * @info: interface that completed
1996 * @SCpnt: command that completed
1997 * @result: driver byte of result
1998 *
1999 * Finish processing automatic request sense command
2000 */
2001static void fas216_rq_sns_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
2002                               unsigned int result)
2003{
2004        fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
2005                   "request sense complete, result=0x%04x%02x%02x",
2006                   result, SCpnt->SCp.Message, SCpnt->SCp.Status);
2007
2008        if (result != DID_OK || SCpnt->SCp.Status != GOOD)
2009                /*
2010                 * Something went wrong.  Make sure that we don't
2011                 * have valid data in the sense buffer that could
2012                 * confuse the higher levels.
2013                 */
2014                memset(SCpnt->sense_buffer, 0, sizeof(SCpnt->sense_buffer));
2015//printk("scsi%d.%c: sense buffer: ", info->host->host_no, '0' + SCpnt->device->id);
2016//{ int i; for (i = 0; i < 32; i++) printk("%02x ", SCpnt->sense_buffer[i]); printk("\n"); }
2017        /*
2018         * Note that we don't set SCpnt->result, since that should
2019         * reflect the status of the command that we were asked by
2020         * the upper layers to process.  This would have been set
2021         * correctly by fas216_std_done.
2022         */
2023        scsi_eh_restore_cmnd(SCpnt, &info->ses);
2024        SCpnt->scsi_done(SCpnt);
2025}
2026
2027/**
2028 * fas216_std_done - finish processing of standard command
2029 * @info: interface that completed
2030 * @SCpnt: command that completed
2031 * @result: driver byte of result
2032 *
2033 * Finish processing of standard command
2034 */
2035static void
2036fas216_std_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, unsigned int result)
2037{
2038        info->stats.fins += 1;
2039
2040        SCpnt->result = result << 16 | info->scsi.SCp.Message << 8 |
2041                        info->scsi.SCp.Status;
2042
2043        fas216_log_command(info, LOG_CONNECT, SCpnt,
2044                "command complete, result=0x%08x", SCpnt->result);
2045
2046        /*
2047         * If the driver detected an error, we're all done.
2048         */
2049        if (host_byte(SCpnt->result) != DID_OK ||
2050            msg_byte(SCpnt->result) != COMMAND_COMPLETE)
2051                goto done;
2052
2053        /*
2054         * If the command returned CHECK_CONDITION or COMMAND_TERMINATED
2055         * status, request the sense information.
2056         */
2057        if (status_byte(SCpnt->result) == CHECK_CONDITION ||
2058            status_byte(SCpnt->result) == COMMAND_TERMINATED)
2059                goto request_sense;
2060
2061        /*
2062         * If the command did not complete with GOOD status,
2063         * we are all done here.
2064         */
2065        if (status_byte(SCpnt->result) != GOOD)
2066                goto done;
2067
2068        /*
2069         * We have successfully completed a command.  Make sure that
2070         * we do not have any buffers left to transfer.  The world
2071         * is not perfect, and we seem to occasionally hit this.
2072         * It can be indicative of a buggy driver, target or the upper
2073         * levels of the SCSI code.
2074         */
2075        if (info->scsi.SCp.ptr) {
2076                switch (SCpnt->cmnd[0]) {
2077                case INQUIRY:
2078                case START_STOP:
2079                case MODE_SENSE:
2080                        break;
2081
2082                default:
2083                        scmd_printk(KERN_ERR, SCpnt,
2084                                    "incomplete data transfer detected: res=%08X ptr=%p len=%X\n",
2085                                    SCpnt->result, info->scsi.SCp.ptr,
2086                                    info->scsi.SCp.this_residual);
2087                        scsi_print_command(SCpnt);
2088                        set_host_byte(SCpnt, DID_ERROR);
2089                        goto request_sense;
2090                }
2091        }
2092
2093done:
2094        if (SCpnt->scsi_done) {
2095                SCpnt->scsi_done(SCpnt);
2096                return;
2097        }
2098
2099        panic("scsi%d.H: null scsi_done function in fas216_done",
2100                info->host->host_no);
2101
2102
2103request_sense:
2104        if (SCpnt->cmnd[0] == REQUEST_SENSE)
2105                goto done;
2106
2107        scsi_eh_prep_cmnd(SCpnt, &info->ses, NULL, 0, ~0);
2108        fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
2109                          "requesting sense");
2110        init_SCp(SCpnt);
2111        SCpnt->SCp.Message = 0;
2112        SCpnt->SCp.Status = 0;
2113        SCpnt->tag = 0;
2114        SCpnt->host_scribble = (void *)fas216_rq_sns_done;
2115
2116        /*
2117         * Place this command into the high priority "request
2118         * sense" slot.  This will be the very next command
2119         * executed, unless a target connects to us.
2120         */
2121        if (info->reqSCpnt)
2122                printk(KERN_WARNING "scsi%d.%c: losing request command\n",
2123                        info->host->host_no, '0' + SCpnt->device->id);
2124        info->reqSCpnt = SCpnt;
2125}
2126
2127/**
2128 * fas216_done - complete processing for current command
2129 * @info: interface that completed
2130 * @result: driver byte of result
2131 *
2132 * Complete processing for current command
2133 */
2134static void fas216_done(FAS216_Info *info, unsigned int result)
2135{
2136        void (*fn)(FAS216_Info *, struct scsi_cmnd *, unsigned int);
2137        struct scsi_cmnd *SCpnt;
2138        unsigned long flags;
2139
2140        fas216_checkmagic(info);
2141
2142        if (!info->SCpnt)
2143                goto no_command;
2144
2145        SCpnt = info->SCpnt;
2146        info->SCpnt = NULL;
2147        info->scsi.phase = PHASE_IDLE;
2148
2149        if (info->scsi.aborting) {
2150                fas216_log(info, 0, "uncaught abort - returning DID_ABORT");
2151                result = DID_ABORT;
2152                info->scsi.aborting = 0;
2153        }
2154
2155        /*
2156         * Sanity check the completion - if we have zero bytes left
2157         * to transfer, we should not have a valid pointer.
2158         */
2159        if (info->scsi.SCp.ptr && info->scsi.SCp.this_residual == 0) {
2160                scmd_printk(KERN_INFO, SCpnt,
2161                            "zero bytes left to transfer, but buffer pointer still valid: ptr=%p len=%08x\n",
2162                            info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
2163                info->scsi.SCp.ptr = NULL;
2164                scsi_print_command(SCpnt);
2165        }
2166
2167        /*
2168         * Clear down this command as completed.  If we need to request
2169         * the sense information, fas216_kick will re-assert the busy
2170         * status.
2171         */
2172        info->device[SCpnt->device->id].parity_check = 0;
2173        clear_bit(SCpnt->device->id * 8 +
2174                  (u8)(SCpnt->device->lun & 0x7), info->busyluns);
2175
2176        fn = (void (*)(FAS216_Info *, struct scsi_cmnd *, unsigned int))SCpnt->host_scribble;
2177        fn(info, SCpnt, result);
2178
2179        if (info->scsi.irq) {
2180                spin_lock_irqsave(&info->host_lock, flags);
2181                if (info->scsi.phase == PHASE_IDLE)
2182                        fas216_kick(info);
2183                spin_unlock_irqrestore(&info->host_lock, flags);
2184        }
2185        return;
2186
2187no_command:
2188        panic("scsi%d.H: null command in fas216_done",
2189                info->host->host_no);
2190}
2191
2192/**
2193 * fas216_queue_command - queue a command for adapter to process.
2194 * @SCpnt: Command to queue
2195 * @done: done function to call once command is complete
2196 *
2197 * Queue a command for adapter to process.
2198 * Returns: 0 on success, else error.
2199 * Notes: io_request_lock is held, interrupts are disabled.
2200 */
2201static int fas216_queue_command_lck(struct scsi_cmnd *SCpnt,
2202                         void (*done)(struct scsi_cmnd *))
2203{
2204        FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2205        int result;
2206
2207        fas216_checkmagic(info);
2208
2209        fas216_log_command(info, LOG_CONNECT, SCpnt,
2210                           "received command (%p)", SCpnt);
2211
2212        SCpnt->scsi_done = done;
2213        SCpnt->host_scribble = (void *)fas216_std_done;
2214        SCpnt->result = 0;
2215
2216        init_SCp(SCpnt);
2217
2218        info->stats.queues += 1;
2219        SCpnt->tag = 0;
2220
2221        spin_lock(&info->host_lock);
2222
2223        /*
2224         * Add command into execute queue and let it complete under
2225         * whatever scheme we're using.
2226         */
2227        result = !queue_add_cmd_ordered(&info->queues.issue, SCpnt);
2228
2229        /*
2230         * If we successfully added the command,
2231         * kick the interface to get it moving.
2232         */
2233        if (result == 0 && info->scsi.phase == PHASE_IDLE)
2234                fas216_kick(info);
2235        spin_unlock(&info->host_lock);
2236
2237        fas216_log_target(info, LOG_CONNECT, -1, "queue %s",
2238                result ? "failure" : "success");
2239
2240        return result;
2241}
2242
2243DEF_SCSI_QCMD(fas216_queue_command)
2244
2245/**
2246 * fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command
2247 * @SCpnt: Command to wake
2248 *
2249 * Trigger restart of a waiting thread in fas216_command
2250 */
2251static void fas216_internal_done(struct scsi_cmnd *SCpnt)
2252{
2253        FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2254
2255        fas216_checkmagic(info);
2256
2257        info->internal_done = 1;
2258}
2259
2260/**
2261 * fas216_noqueue_command - process a command for the adapter.
2262 * @SCpnt: Command to queue
2263 *
2264 * Queue a command for adapter to process.
2265 * Returns: scsi result code.
2266 * Notes: io_request_lock is held, interrupts are disabled.
2267 */
2268static int fas216_noqueue_command_lck(struct scsi_cmnd *SCpnt,
2269                           void (*done)(struct scsi_cmnd *))
2270{
2271        FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2272
2273        fas216_checkmagic(info);
2274
2275        /*
2276         * We should only be using this if we don't have an interrupt.
2277         * Provide some "incentive" to use the queueing code.
2278         */
2279        BUG_ON(info->scsi.irq);
2280
2281        info->internal_done = 0;
2282        fas216_queue_command_lck(SCpnt, fas216_internal_done);
2283
2284        /*
2285         * This wastes time, since we can't return until the command is
2286         * complete. We can't sleep either since we may get re-entered!
2287         * However, we must re-enable interrupts, or else we'll be
2288         * waiting forever.
2289         */
2290        spin_unlock_irq(info->host->host_lock);
2291
2292        while (!info->internal_done) {
2293                /*
2294                 * If we don't have an IRQ, then we must poll the card for
2295                 * it's interrupt, and use that to call this driver's
2296                 * interrupt routine.  That way, we keep the command
2297                 * progressing.  Maybe we can add some intelligence here
2298                 * and go to sleep if we know that the device is going
2299                 * to be some time (eg, disconnected).
2300                 */
2301                if (fas216_readb(info, REG_STAT) & STAT_INT) {
2302                        spin_lock_irq(info->host->host_lock);
2303                        fas216_intr(info);
2304                        spin_unlock_irq(info->host->host_lock);
2305                }
2306        }
2307
2308        spin_lock_irq(info->host->host_lock);
2309
2310        done(SCpnt);
2311
2312        return 0;
2313}
2314
2315DEF_SCSI_QCMD(fas216_noqueue_command)
2316
2317/*
2318 * Error handler timeout function.  Indicate that we timed out,
2319 * and wake up any error handler process so it can continue.
2320 */
2321static void fas216_eh_timer(unsigned long data)
2322{
2323        FAS216_Info *info = (FAS216_Info *)data;
2324
2325        fas216_log(info, LOG_ERROR, "error handling timed out\n");
2326
2327        del_timer(&info->eh_timer);
2328
2329        if (info->rst_bus_status == 0)
2330                info->rst_bus_status = -1;
2331        if (info->rst_dev_status == 0)
2332                info->rst_dev_status = -1;
2333
2334        wake_up(&info->eh_wait);
2335}
2336
2337enum res_find {
2338        res_failed,             /* not found                    */
2339        res_success,            /* command on issue queue       */
2340        res_hw_abort            /* command on disconnected dev  */
2341};
2342
2343/**
2344 * fas216_do_abort - decide how to abort a command
2345 * @SCpnt: command to abort
2346 *
2347 * Decide how to abort a command.
2348 * Returns: abort status
2349 */
2350static enum res_find fas216_find_command(FAS216_Info *info,
2351                                         struct scsi_cmnd *SCpnt)
2352{
2353        enum res_find res = res_failed;
2354
2355        if (queue_remove_cmd(&info->queues.issue, SCpnt)) {
2356                /*
2357                 * The command was on the issue queue, and has not been
2358                 * issued yet.  We can remove the command from the queue,
2359                 * and acknowledge the abort.  Neither the device nor the
2360                 * interface know about the command.
2361                 */
2362                printk("on issue queue ");
2363
2364                res = res_success;
2365        } else if (queue_remove_cmd(&info->queues.disconnected, SCpnt)) {
2366                /*
2367                 * The command was on the disconnected queue.  We must
2368                 * reconnect with the device if possible, and send it
2369                 * an abort message.
2370                 */
2371                printk("on disconnected queue ");
2372
2373                res = res_hw_abort;
2374        } else if (info->SCpnt == SCpnt) {
2375                printk("executing ");
2376
2377                switch (info->scsi.phase) {
2378                /*
2379                 * If the interface is idle, and the command is 'disconnectable',
2380                 * then it is the same as on the disconnected queue.
2381                 */
2382                case PHASE_IDLE:
2383                        if (info->scsi.disconnectable) {
2384                                info->scsi.disconnectable = 0;
2385                                info->SCpnt = NULL;
2386                                res = res_hw_abort;
2387                        }
2388                        break;
2389
2390                default:
2391                        break;
2392                }
2393        } else if (info->origSCpnt == SCpnt) {
2394                /*
2395                 * The command will be executed next, but a command
2396                 * is currently using the interface.  This is similar to
2397                 * being on the issue queue, except the busylun bit has
2398                 * been set.
2399                 */
2400                info->origSCpnt = NULL;
2401                clear_bit(SCpnt->device->id * 8 +
2402                          (u8)(SCpnt->device->lun & 0x7), info->busyluns);
2403                printk("waiting for execution ");
2404                res = res_success;
2405        } else
2406                printk("unknown ");
2407
2408        return res;
2409}
2410
2411/**
2412 * fas216_eh_abort - abort this command
2413 * @SCpnt: command to abort
2414 *
2415 * Abort this command.
2416 * Returns: FAILED if unable to abort
2417 * Notes: io_request_lock is taken, and irqs are disabled
2418 */
2419int fas216_eh_abort(struct scsi_cmnd *SCpnt)
2420{
2421        FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2422        int result = FAILED;
2423
2424        fas216_checkmagic(info);
2425
2426        info->stats.aborts += 1;
2427
2428        scmd_printk(KERN_WARNING, SCpnt, "abort command\n");
2429
2430        print_debug_list();
2431        fas216_dumpstate(info);
2432
2433        switch (fas216_find_command(info, SCpnt)) {
2434        /*
2435         * We found the command, and cleared it out.  Either
2436         * the command is still known to be executing on the
2437         * target, or the busylun bit is not set.
2438         */
2439        case res_success:
2440                scmd_printk(KERN_WARNING, SCpnt, "abort %p success\n", SCpnt);
2441                result = SUCCESS;
2442                break;
2443
2444        /*
2445         * We need to reconnect to the target and send it an
2446         * ABORT or ABORT_TAG message.  We can only do this
2447         * if the bus is free.
2448         */
2449        case res_hw_abort:
2450
2451        /*
2452         * We are unable to abort the command for some reason.
2453         */
2454        default:
2455        case res_failed:
2456                scmd_printk(KERN_WARNING, SCpnt, "abort %p failed\n", SCpnt);
2457                break;
2458        }
2459
2460        return result;
2461}
2462
2463/**
2464 * fas216_eh_device_reset - Reset the device associated with this command
2465 * @SCpnt: command specifing device to reset
2466 *
2467 * Reset the device associated with this command.
2468 * Returns: FAILED if unable to reset.
2469 * Notes: We won't be re-entered, so we'll only have one device
2470 * reset on the go at one time.
2471 */
2472int fas216_eh_device_reset(struct scsi_cmnd *SCpnt)
2473{
2474        FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2475        unsigned long flags;
2476        int i, res = FAILED, target = SCpnt->device->id;
2477
2478        fas216_log(info, LOG_ERROR, "device reset for target %d", target);
2479
2480        spin_lock_irqsave(&info->host_lock, flags);
2481
2482        do {
2483                /*
2484                 * If we are currently connected to a device, and
2485                 * it is the device we want to reset, there is
2486                 * nothing we can do here.  Chances are it is stuck,
2487                 * and we need a bus reset.
2488                 */
2489                if (info->SCpnt && !info->scsi.disconnectable &&
2490                    info->SCpnt->device->id == SCpnt->device->id)
2491                        break;
2492
2493                /*
2494                 * We're going to be resetting this device.  Remove
2495                 * all pending commands from the driver.  By doing
2496                 * so, we guarantee that we won't touch the command
2497                 * structures except to process the reset request.
2498                 */
2499                queue_remove_all_target(&info->queues.issue, target);
2500                queue_remove_all_target(&info->queues.disconnected, target);
2501                if (info->origSCpnt && info->origSCpnt->device->id == target)
2502                        info->origSCpnt = NULL;
2503                if (info->reqSCpnt && info->reqSCpnt->device->id == target)
2504                        info->reqSCpnt = NULL;
2505                for (i = 0; i < 8; i++)
2506                        clear_bit(target * 8 + i, info->busyluns);
2507
2508                /*
2509                 * Hijack this SCSI command structure to send
2510                 * a bus device reset message to this device.
2511                 */
2512                SCpnt->host_scribble = (void *)fas216_devicereset_done;
2513
2514                info->rst_dev_status = 0;
2515                info->rstSCpnt = SCpnt;
2516
2517                if (info->scsi.phase == PHASE_IDLE)
2518                        fas216_kick(info);
2519
2520                mod_timer(&info->eh_timer, jiffies + 30 * HZ);
2521                spin_unlock_irqrestore(&info->host_lock, flags);
2522
2523                /*
2524                 * Wait up to 30 seconds for the reset to complete.
2525                 */
2526                wait_event(info->eh_wait, info->rst_dev_status);
2527
2528                del_timer_sync(&info->eh_timer);
2529                spin_lock_irqsave(&info->host_lock, flags);
2530                info->rstSCpnt = NULL;
2531
2532                if (info->rst_dev_status == 1)
2533                        res = SUCCESS;
2534        } while (0);
2535
2536        SCpnt->host_scribble = NULL;
2537        spin_unlock_irqrestore(&info->host_lock, flags);
2538
2539        fas216_log(info, LOG_ERROR, "device reset complete: %s\n",
2540                   res == SUCCESS ? "success" : "failed");
2541
2542        return res;
2543}
2544
2545/**
2546 * fas216_eh_bus_reset - Reset the bus associated with the command
2547 * @SCpnt: command specifing bus to reset
2548 *
2549 * Reset the bus associated with the command.
2550 * Returns: FAILED if unable to reset.
2551 * Notes: Further commands are blocked.
2552 */
2553int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt)
2554{
2555        FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2556        unsigned long flags;
2557        struct scsi_device *SDpnt;
2558
2559        fas216_checkmagic(info);
2560        fas216_log(info, LOG_ERROR, "resetting bus");
2561
2562        info->stats.bus_resets += 1;
2563
2564        spin_lock_irqsave(&info->host_lock, flags);
2565
2566        /*
2567         * Stop all activity on this interface.
2568         */
2569        fas216_aborttransfer(info);
2570        fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
2571
2572        /*
2573         * Clear any pending interrupts.
2574         */
2575        while (fas216_readb(info, REG_STAT) & STAT_INT)
2576                fas216_readb(info, REG_INST);
2577
2578        info->rst_bus_status = 0;
2579
2580        /*
2581         * For each attached hard-reset device, clear out
2582         * all command structures.  Leave the running
2583         * command in place.
2584         */
2585        shost_for_each_device(SDpnt, info->host) {
2586                int i;
2587
2588                if (SDpnt->soft_reset)
2589                        continue;
2590
2591                queue_remove_all_target(&info->queues.issue, SDpnt->id);
2592                queue_remove_all_target(&info->queues.disconnected, SDpnt->id);
2593                if (info->origSCpnt && info->origSCpnt->device->id == SDpnt->id)
2594                        info->origSCpnt = NULL;
2595                if (info->reqSCpnt && info->reqSCpnt->device->id == SDpnt->id)
2596                        info->reqSCpnt = NULL;
2597                info->SCpnt = NULL;
2598
2599                for (i = 0; i < 8; i++)
2600                        clear_bit(SDpnt->id * 8 + i, info->busyluns);
2601        }
2602
2603        info->scsi.phase = PHASE_IDLE;
2604
2605        /*
2606         * Reset the SCSI bus.  Device cleanup happens in
2607         * the interrupt handler.
2608         */
2609        fas216_cmd(info, CMD_RESETSCSI);
2610
2611        mod_timer(&info->eh_timer, jiffies + HZ);
2612        spin_unlock_irqrestore(&info->host_lock, flags);
2613
2614        /*
2615         * Wait one second for the interrupt.
2616         */
2617        wait_event(info->eh_wait, info->rst_bus_status);
2618        del_timer_sync(&info->eh_timer);
2619
2620        fas216_log(info, LOG_ERROR, "bus reset complete: %s\n",
2621                   info->rst_bus_status == 1 ? "success" : "failed");
2622
2623        return info->rst_bus_status == 1 ? SUCCESS : FAILED;
2624}
2625
2626/**
2627 * fas216_init_chip - Initialise FAS216 state after reset
2628 * @info: state structure for interface
2629 *
2630 * Initialise FAS216 state after reset
2631 */
2632static void fas216_init_chip(FAS216_Info *info)
2633{
2634        unsigned int clock = ((info->ifcfg.clockrate - 1) / 5 + 1) & 7;
2635        fas216_writeb(info, REG_CLKF, clock);
2636        fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2637        fas216_writeb(info, REG_CNTL2, info->scsi.cfg[1]);
2638        fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
2639        fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
2640        fas216_writeb(info, REG_SOF, 0);
2641        fas216_writeb(info, REG_STP, info->scsi.async_stp);
2642        fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2643}
2644
2645/**
2646 * fas216_eh_host_reset - Reset the host associated with this command
2647 * @SCpnt: command specifing host to reset
2648 *
2649 * Reset the host associated with this command.
2650 * Returns: FAILED if unable to reset.
2651 * Notes: io_request_lock is taken, and irqs are disabled
2652 */
2653int fas216_eh_host_reset(struct scsi_cmnd *SCpnt)
2654{
2655        FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2656
2657        spin_lock_irq(info->host->host_lock);
2658
2659        fas216_checkmagic(info);
2660
2661        fas216_log(info, LOG_ERROR, "resetting host");
2662
2663        /*
2664         * Reset the SCSI chip.
2665         */
2666        fas216_cmd(info, CMD_RESETCHIP);
2667
2668        /*
2669         * Ugly ugly ugly!
2670         * We need to release the host_lock and enable
2671         * IRQs if we sleep, but we must relock and disable
2672         * IRQs after the sleep.
2673         */
2674        spin_unlock_irq(info->host->host_lock);
2675        msleep(50 * 1000/100);
2676        spin_lock_irq(info->host->host_lock);
2677
2678        /*
2679         * Release the SCSI reset.
2680         */
2681        fas216_cmd(info, CMD_NOP);
2682
2683        fas216_init_chip(info);
2684
2685        spin_unlock_irq(info->host->host_lock);
2686        return SUCCESS;
2687}
2688
2689#define TYPE_UNKNOWN    0
2690#define TYPE_NCR53C90   1
2691#define TYPE_NCR53C90A  2
2692#define TYPE_NCR53C9x   3
2693#define TYPE_Am53CF94   4
2694#define TYPE_EmFAS216   5
2695#define TYPE_QLFAS216   6
2696
2697static char *chip_types[] = {
2698        "unknown",
2699        "NS NCR53C90",
2700        "NS NCR53C90A",
2701        "NS NCR53C9x",
2702        "AMD Am53CF94",
2703        "Emulex FAS216",
2704        "QLogic FAS216"
2705};
2706
2707static int fas216_detect_type(FAS216_Info *info)
2708{
2709        int family, rev;
2710
2711        /*
2712         * Reset the chip.
2713         */
2714        fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2715        udelay(50);
2716        fas216_writeb(info, REG_CMD, CMD_NOP);
2717
2718        /*
2719         * Check to see if control reg 2 is present.
2720         */
2721        fas216_writeb(info, REG_CNTL3, 0);
2722        fas216_writeb(info, REG_CNTL2, CNTL2_S2FE);
2723
2724        /*
2725         * If we are unable to read back control reg 2
2726         * correctly, it is not present, and we have a
2727         * NCR53C90.
2728         */
2729        if ((fas216_readb(info, REG_CNTL2) & (~0xe0)) != CNTL2_S2FE)
2730                return TYPE_NCR53C90;
2731
2732        /*
2733         * Now, check control register 3
2734         */
2735        fas216_writeb(info, REG_CNTL2, 0);
2736        fas216_writeb(info, REG_CNTL3, 0);
2737        fas216_writeb(info, REG_CNTL3, 5);
2738
2739        /*
2740         * If we are unable to read the register back
2741         * correctly, we have a NCR53C90A
2742         */
2743        if (fas216_readb(info, REG_CNTL3) != 5)
2744                return TYPE_NCR53C90A;
2745
2746        /*
2747         * Now read the ID from the chip.
2748         */
2749        fas216_writeb(info, REG_CNTL3, 0);
2750
2751        fas216_writeb(info, REG_CNTL3, CNTL3_ADIDCHK);
2752        fas216_writeb(info, REG_CNTL3, 0);
2753
2754        fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2755        udelay(50);
2756        fas216_writeb(info, REG_CMD, CMD_WITHDMA | CMD_NOP);
2757
2758        fas216_writeb(info, REG_CNTL2, CNTL2_ENF);
2759        fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2760        udelay(50);
2761        fas216_writeb(info, REG_CMD, CMD_NOP);
2762
2763        rev     = fas216_readb(info, REG_ID);
2764        family  = rev >> 3;
2765        rev    &= 7;
2766
2767        switch (family) {
2768        case 0x01:
2769                if (rev == 4)
2770                        return TYPE_Am53CF94;
2771                break;
2772
2773        case 0x02:
2774                switch (rev) {
2775                case 2:
2776                        return TYPE_EmFAS216;
2777                case 3:
2778                        return TYPE_QLFAS216;
2779                }
2780                break;
2781
2782        default:
2783                break;
2784        }
2785        printk("family %x rev %x\n", family, rev);
2786        return TYPE_NCR53C9x;
2787}
2788
2789/**
2790 * fas216_reset_state - Initialise driver internal state
2791 * @info: state to initialise
2792 *
2793 * Initialise driver internal state
2794 */
2795static void fas216_reset_state(FAS216_Info *info)
2796{
2797        int i;
2798
2799        fas216_checkmagic(info);
2800
2801        fas216_bus_reset(info);
2802
2803        /*
2804         * Clear out all stale info in our state structure
2805         */
2806        memset(info->busyluns, 0, sizeof(info->busyluns));
2807        info->scsi.disconnectable = 0;
2808        info->scsi.aborting = 0;
2809
2810        for (i = 0; i < 8; i++) {
2811                info->device[i].parity_enabled  = 0;
2812                info->device[i].parity_check    = 1;
2813        }
2814
2815        /*
2816         * Drain all commands on disconnected queue
2817         */
2818        while (queue_remove(&info->queues.disconnected) != NULL);
2819
2820        /*
2821         * Remove executing commands.
2822         */
2823        info->SCpnt     = NULL;
2824        info->reqSCpnt  = NULL;
2825        info->rstSCpnt  = NULL;
2826        info->origSCpnt = NULL;
2827}
2828
2829/**
2830 * fas216_init - initialise FAS/NCR/AMD SCSI structures.
2831 * @host: a driver-specific filled-out structure
2832 *
2833 * Initialise FAS/NCR/AMD SCSI structures.
2834 * Returns: 0 on success
2835 */
2836int fas216_init(struct Scsi_Host *host)
2837{
2838        FAS216_Info *info = (FAS216_Info *)host->hostdata;
2839
2840        info->magic_start    = MAGIC;
2841        info->magic_end      = MAGIC;
2842        info->host           = host;
2843        info->scsi.cfg[0]    = host->this_id | CNTL1_PERE;
2844        info->scsi.cfg[1]    = CNTL2_ENF | CNTL2_S2FE;
2845        info->scsi.cfg[2]    = info->ifcfg.cntl3 |
2846                               CNTL3_ADIDCHK | CNTL3_QTAG | CNTL3_G2CB | CNTL3_LBTM;
2847        info->scsi.async_stp = fas216_syncperiod(info, info->ifcfg.asyncperiod);
2848
2849        info->rst_dev_status = -1;
2850        info->rst_bus_status = -1;
2851        init_waitqueue_head(&info->eh_wait);
2852        init_timer(&info->eh_timer);
2853        info->eh_timer.data  = (unsigned long)info;
2854        info->eh_timer.function = fas216_eh_timer;
2855        
2856        spin_lock_init(&info->host_lock);
2857
2858        memset(&info->stats, 0, sizeof(info->stats));
2859
2860        msgqueue_initialise(&info->scsi.msgs);
2861
2862        if (!queue_initialise(&info->queues.issue))
2863                return -ENOMEM;
2864
2865        if (!queue_initialise(&info->queues.disconnected)) {
2866                queue_free(&info->queues.issue);
2867                return -ENOMEM;
2868        }
2869
2870        return 0;
2871}
2872
2873/**
2874 * fas216_add - initialise FAS/NCR/AMD SCSI ic.
2875 * @host: a driver-specific filled-out structure
2876 * @dev: parent device
2877 *
2878 * Initialise FAS/NCR/AMD SCSI ic.
2879 * Returns: 0 on success
2880 */
2881int fas216_add(struct Scsi_Host *host, struct device *dev)
2882{
2883        FAS216_Info *info = (FAS216_Info *)host->hostdata;
2884        int type, ret;
2885
2886        if (info->ifcfg.clockrate <= 10 || info->ifcfg.clockrate > 40) {
2887                printk(KERN_CRIT "fas216: invalid clock rate %u MHz\n",
2888                        info->ifcfg.clockrate);
2889                return -EINVAL;
2890        }
2891
2892        fas216_reset_state(info);
2893        type = fas216_detect_type(info);
2894        info->scsi.type = chip_types[type];
2895
2896        udelay(300);
2897
2898        /*
2899         * Initialise the chip correctly.
2900         */
2901        fas216_init_chip(info);
2902
2903        /*
2904         * Reset the SCSI bus.  We don't want to see
2905         * the resulting reset interrupt, so mask it
2906         * out.
2907         */
2908        fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_DISR);
2909        fas216_writeb(info, REG_CMD, CMD_RESETSCSI);
2910
2911        /*
2912         * scsi standard says wait 250ms
2913         */
2914        spin_unlock_irq(info->host->host_lock);
2915        msleep(100*1000/100);
2916        spin_lock_irq(info->host->host_lock);
2917
2918        fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2919        fas216_readb(info, REG_INST);
2920
2921        fas216_checkmagic(info);
2922
2923        ret = scsi_add_host(host, dev);
2924        if (ret)
2925                fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2926        else
2927                scsi_scan_host(host);
2928
2929        return ret;
2930}
2931
2932void fas216_remove(struct Scsi_Host *host)
2933{
2934        FAS216_Info *info = (FAS216_Info *)host->hostdata;
2935
2936        fas216_checkmagic(info);
2937        scsi_remove_host(host);
2938
2939        fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2940        scsi_host_put(host);
2941}
2942
2943/**
2944 * fas216_release - release all resources for FAS/NCR/AMD SCSI ic.
2945 * @host: a driver-specific filled-out structure
2946 *
2947 * release all resources and put everything to bed for FAS/NCR/AMD SCSI ic.
2948 */
2949void fas216_release(struct Scsi_Host *host)
2950{
2951        FAS216_Info *info = (FAS216_Info *)host->hostdata;
2952
2953        queue_free(&info->queues.disconnected);
2954        queue_free(&info->queues.issue);
2955}
2956
2957void fas216_print_host(FAS216_Info *info, struct seq_file *m)
2958{
2959        seq_printf(m,
2960                        "\n"
2961                        "Chip    : %s\n"
2962                        " Address: 0x%p\n"
2963                        " IRQ    : %d\n"
2964                        " DMA    : %d\n",
2965                        info->scsi.type, info->scsi.io_base,
2966                        info->scsi.irq, info->scsi.dma);
2967}
2968
2969void fas216_print_stats(FAS216_Info *info, struct seq_file *m)
2970{
2971        seq_printf(m, "\n"
2972                        "Command Statistics:\n"
2973                        " Queued     : %u\n"
2974                        " Issued     : %u\n"
2975                        " Completed  : %u\n"
2976                        " Reads      : %u\n"
2977                        " Writes     : %u\n"
2978                        " Others     : %u\n"
2979                        " Disconnects: %u\n"
2980                        " Aborts     : %u\n"
2981                        " Bus resets : %u\n"
2982                        " Host resets: %u\n",
2983                        info->stats.queues,      info->stats.removes,
2984                        info->stats.fins,        info->stats.reads,
2985                        info->stats.writes,      info->stats.miscs,
2986                        info->stats.disconnects, info->stats.aborts,
2987                        info->stats.bus_resets,  info->stats.host_resets);
2988}
2989
2990void fas216_print_devices(FAS216_Info *info, struct seq_file *m)
2991{
2992        struct fas216_device *dev;
2993        struct scsi_device *scd;
2994
2995        seq_puts(m, "Device/Lun TaggedQ       Parity   Sync\n");
2996
2997        shost_for_each_device(scd, info->host) {
2998                dev = &info->device[scd->id];
2999                seq_printf(m, "     %d/%llu   ", scd->id, scd->lun);
3000                if (scd->tagged_supported)
3001                        seq_printf(m, "%3sabled(%3d) ",
3002                                     scd->simple_tags ? "en" : "dis",
3003                                     scd->current_tag);
3004                else
3005                        seq_puts(m, "unsupported   ");
3006
3007                seq_printf(m, "%3sabled ", dev->parity_enabled ? "en" : "dis");
3008
3009                if (dev->sof)
3010                        seq_printf(m, "offset %d, %d ns\n",
3011                                     dev->sof, dev->period * 4);
3012                else
3013                        seq_puts(m, "async\n");
3014        }
3015}
3016
3017EXPORT_SYMBOL(fas216_init);
3018EXPORT_SYMBOL(fas216_add);
3019EXPORT_SYMBOL(fas216_queue_command);
3020EXPORT_SYMBOL(fas216_noqueue_command);
3021EXPORT_SYMBOL(fas216_intr);
3022EXPORT_SYMBOL(fas216_remove);
3023EXPORT_SYMBOL(fas216_release);
3024EXPORT_SYMBOL(fas216_eh_abort);
3025EXPORT_SYMBOL(fas216_eh_device_reset);
3026EXPORT_SYMBOL(fas216_eh_bus_reset);
3027EXPORT_SYMBOL(fas216_eh_host_reset);
3028EXPORT_SYMBOL(fas216_print_host);
3029EXPORT_SYMBOL(fas216_print_stats);
3030EXPORT_SYMBOL(fas216_print_devices);
3031
3032MODULE_AUTHOR("Russell King");
3033MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core");
3034MODULE_LICENSE("GPL");
3035