linux/drivers/scsi/wd33c93.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Copyright (c) 1996 John Shifflett, GeoLog Consulting
   4 *    john@geolog.com
   5 *    jshiffle@netcom.com
   6 */
   7
   8/*
   9 * Drew Eckhardt's excellent 'Generic NCR5380' sources from Linux-PC
  10 * provided much of the inspiration and some of the code for this
  11 * driver. Everything I know about Amiga DMA was gleaned from careful
  12 * reading of Hamish Mcdonald's original wd33c93 driver; in fact, I
  13 * borrowed shamelessly from all over that source. Thanks Hamish!
  14 *
  15 * _This_ driver is (I feel) an improvement over the old one in
  16 * several respects:
  17 *
  18 *    -  Target Disconnection/Reconnection  is now supported. Any
  19 *          system with more than one device active on the SCSI bus
  20 *          will benefit from this. The driver defaults to what I
  21 *          call 'adaptive disconnect' - meaning that each command
  22 *          is evaluated individually as to whether or not it should
  23 *          be run with the option to disconnect/reselect (if the
  24 *          device chooses), or as a "SCSI-bus-hog".
  25 *
  26 *    -  Synchronous data transfers are now supported. Because of
  27 *          a few devices that choke after telling the driver that
  28 *          they can do sync transfers, we don't automatically use
  29 *          this faster protocol - it can be enabled via the command-
  30 *          line on a device-by-device basis.
  31 *
  32 *    -  Runtime operating parameters can now be specified through
  33 *       the 'amiboot' or the 'insmod' command line. For amiboot do:
  34 *          "amiboot [usual stuff] wd33c93=blah,blah,blah"
  35 *       The defaults should be good for most people. See the comment
  36 *       for 'setup_strings' below for more details.
  37 *
  38 *    -  The old driver relied exclusively on what the Western Digital
  39 *          docs call "Combination Level 2 Commands", which are a great
  40 *          idea in that the CPU is relieved of a lot of interrupt
  41 *          overhead. However, by accepting a certain (user-settable)
  42 *          amount of additional interrupts, this driver achieves
  43 *          better control over the SCSI bus, and data transfers are
  44 *          almost as fast while being much easier to define, track,
  45 *          and debug.
  46 *
  47 *
  48 * TODO:
  49 *       more speed. linked commands.
  50 *
  51 *
  52 * People with bug reports, wish-lists, complaints, comments,
  53 * or improvements are asked to pah-leeez email me (John Shifflett)
  54 * at john@geolog.com or jshiffle@netcom.com! I'm anxious to get
  55 * this thing into as good a shape as possible, and I'm positive
  56 * there are lots of lurking bugs and "Stupid Places".
  57 *
  58 * Updates:
  59 *
  60 * Added support for pre -A chips, which don't have advanced features
  61 * and will generate CSR_RESEL rather than CSR_RESEL_AM.
  62 *      Richard Hirst <richard@sleepie.demon.co.uk>  August 2000
  63 *
  64 * Added support for Burst Mode DMA and Fast SCSI. Enabled the use of
  65 * default_sx_per for asynchronous data transfers. Added adjustment
  66 * of transfer periods in sx_table to the actual input-clock.
  67 *  peter fuerst <post@pfrst.de>  February 2007
  68 */
  69
  70#include <linux/module.h>
  71
  72#include <linux/string.h>
  73#include <linux/delay.h>
  74#include <linux/init.h>
  75#include <linux/interrupt.h>
  76#include <linux/blkdev.h>
  77
  78#include <scsi/scsi.h>
  79#include <scsi/scsi_cmnd.h>
  80#include <scsi/scsi_device.h>
  81#include <scsi/scsi_host.h>
  82
  83#include <asm/irq.h>
  84
  85#include "wd33c93.h"
  86
  87#define optimum_sx_per(hostdata) (hostdata)->sx_table[1].period_ns
  88
  89
  90#define WD33C93_VERSION    "1.26++"
  91#define WD33C93_DATE       "10/Feb/2007"
  92
  93MODULE_AUTHOR("John Shifflett");
  94MODULE_DESCRIPTION("Generic WD33C93 SCSI driver");
  95MODULE_LICENSE("GPL");
  96
  97/*
  98 * 'setup_strings' is a single string used to pass operating parameters and
  99 * settings from the kernel/module command-line to the driver. 'setup_args[]'
 100 * is an array of strings that define the compile-time default values for
 101 * these settings. If Linux boots with an amiboot or insmod command-line,
 102 * those settings are combined with 'setup_args[]'. Note that amiboot
 103 * command-lines are prefixed with "wd33c93=" while insmod uses a
 104 * "setup_strings=" prefix. The driver recognizes the following keywords
 105 * (lower case required) and arguments:
 106 *
 107 * -  nosync:bitmask -bitmask is a byte where the 1st 7 bits correspond with
 108 *                    the 7 possible SCSI devices. Set a bit to negotiate for
 109 *                    asynchronous transfers on that device. To maintain
 110 *                    backwards compatibility, a command-line such as
 111 *                    "wd33c93=255" will be automatically translated to
 112 *                    "wd33c93=nosync:0xff".
 113 * -  nodma:x        -x = 1 to disable DMA, x = 0 to enable it. Argument is
 114 *                    optional - if not present, same as "nodma:1".
 115 * -  period:ns      -ns is the minimum # of nanoseconds in a SCSI data transfer
 116 *                    period. Default is 500; acceptable values are 250 - 1000.
 117 * -  disconnect:x   -x = 0 to never allow disconnects, 2 to always allow them.
 118 *                    x = 1 does 'adaptive' disconnects, which is the default
 119 *                    and generally the best choice.
 120 * -  debug:x        -If 'DEBUGGING_ON' is defined, x is a bit mask that causes
 121 *                    various types of debug output to printed - see the DB_xxx
 122 *                    defines in wd33c93.h
 123 * -  clock:x        -x = clock input in MHz for WD33c93 chip. Normal values
 124 *                    would be from 8 through 20. Default is 8.
 125 * -  burst:x        -x = 1 to use Burst Mode (or Demand-Mode) DMA, x = 0 to use
 126 *                    Single Byte DMA, which is the default. Argument is
 127 *                    optional - if not present, same as "burst:1".
 128 * -  fast:x         -x = 1 to enable Fast SCSI, which is only effective with
 129 *                    input-clock divisor 4 (WD33C93_FS_16_20), x = 0 to disable
 130 *                    it, which is the default.  Argument is optional - if not
 131 *                    present, same as "fast:1".
 132 * -  next           -No argument. Used to separate blocks of keywords when
 133 *                    there's more than one host adapter in the system.
 134 *
 135 * Syntax Notes:
 136 * -  Numeric arguments can be decimal or the '0x' form of hex notation. There
 137 *    _must_ be a colon between a keyword and its numeric argument, with no
 138 *    spaces.
 139 * -  Keywords are separated by commas, no spaces, in the standard kernel
 140 *    command-line manner.
 141 * -  A keyword in the 'nth' comma-separated command-line member will overwrite
 142 *    the 'nth' element of setup_args[]. A blank command-line member (in
 143 *    other words, a comma with no preceding keyword) will _not_ overwrite
 144 *    the corresponding setup_args[] element.
 145 * -  If a keyword is used more than once, the first one applies to the first
 146 *    SCSI host found, the second to the second card, etc, unless the 'next'
 147 *    keyword is used to change the order.
 148 *
 149 * Some amiboot examples (for insmod, use 'setup_strings' instead of 'wd33c93'):
 150 * -  wd33c93=nosync:255
 151 * -  wd33c93=nodma
 152 * -  wd33c93=nodma:1
 153 * -  wd33c93=disconnect:2,nosync:0x08,period:250
 154 * -  wd33c93=debug:0x1c
 155 */
 156
 157/* Normally, no defaults are specified */
 158static char *setup_args[] = { "", "", "", "", "", "", "", "", "", "" };
 159
 160static char *setup_strings;
 161module_param(setup_strings, charp, 0);
 162
 163static void wd33c93_execute(struct Scsi_Host *instance);
 164
 165#ifdef CONFIG_WD33C93_PIO
 166static inline uchar
 167read_wd33c93(const wd33c93_regs regs, uchar reg_num)
 168{
 169        uchar data;
 170
 171        outb(reg_num, regs.SASR);
 172        data = inb(regs.SCMD);
 173        return data;
 174}
 175
 176static inline unsigned long
 177read_wd33c93_count(const wd33c93_regs regs)
 178{
 179        unsigned long value;
 180
 181        outb(WD_TRANSFER_COUNT_MSB, regs.SASR);
 182        value = inb(regs.SCMD) << 16;
 183        value |= inb(regs.SCMD) << 8;
 184        value |= inb(regs.SCMD);
 185        return value;
 186}
 187
 188static inline uchar
 189read_aux_stat(const wd33c93_regs regs)
 190{
 191        return inb(regs.SASR);
 192}
 193
 194static inline void
 195write_wd33c93(const wd33c93_regs regs, uchar reg_num, uchar value)
 196{
 197      outb(reg_num, regs.SASR);
 198      outb(value, regs.SCMD);
 199}
 200
 201static inline void
 202write_wd33c93_count(const wd33c93_regs regs, unsigned long value)
 203{
 204        outb(WD_TRANSFER_COUNT_MSB, regs.SASR);
 205        outb((value >> 16) & 0xff, regs.SCMD);
 206        outb((value >> 8) & 0xff, regs.SCMD);
 207        outb( value & 0xff, regs.SCMD);
 208}
 209
 210#define write_wd33c93_cmd(regs, cmd) \
 211        write_wd33c93((regs), WD_COMMAND, (cmd))
 212
 213static inline void
 214write_wd33c93_cdb(const wd33c93_regs regs, uint len, uchar cmnd[])
 215{
 216        int i;
 217
 218        outb(WD_CDB_1, regs.SASR);
 219        for (i=0; i<len; i++)
 220                outb(cmnd[i], regs.SCMD);
 221}
 222
 223#else /* CONFIG_WD33C93_PIO */
 224static inline uchar
 225read_wd33c93(const wd33c93_regs regs, uchar reg_num)
 226{
 227        *regs.SASR = reg_num;
 228        mb();
 229        return (*regs.SCMD);
 230}
 231
 232static unsigned long
 233read_wd33c93_count(const wd33c93_regs regs)
 234{
 235        unsigned long value;
 236
 237        *regs.SASR = WD_TRANSFER_COUNT_MSB;
 238        mb();
 239        value = *regs.SCMD << 16;
 240        value |= *regs.SCMD << 8;
 241        value |= *regs.SCMD;
 242        mb();
 243        return value;
 244}
 245
 246static inline uchar
 247read_aux_stat(const wd33c93_regs regs)
 248{
 249        return *regs.SASR;
 250}
 251
 252static inline void
 253write_wd33c93(const wd33c93_regs regs, uchar reg_num, uchar value)
 254{
 255        *regs.SASR = reg_num;
 256        mb();
 257        *regs.SCMD = value;
 258        mb();
 259}
 260
 261static void
 262write_wd33c93_count(const wd33c93_regs regs, unsigned long value)
 263{
 264        *regs.SASR = WD_TRANSFER_COUNT_MSB;
 265        mb();
 266        *regs.SCMD = value >> 16;
 267        *regs.SCMD = value >> 8;
 268        *regs.SCMD = value;
 269        mb();
 270}
 271
 272static inline void
 273write_wd33c93_cmd(const wd33c93_regs regs, uchar cmd)
 274{
 275        *regs.SASR = WD_COMMAND;
 276        mb();
 277        *regs.SCMD = cmd;
 278        mb();
 279}
 280
 281static inline void
 282write_wd33c93_cdb(const wd33c93_regs regs, uint len, uchar cmnd[])
 283{
 284        int i;
 285
 286        *regs.SASR = WD_CDB_1;
 287        for (i = 0; i < len; i++)
 288                *regs.SCMD = cmnd[i];
 289}
 290#endif /* CONFIG_WD33C93_PIO */
 291
 292static inline uchar
 293read_1_byte(const wd33c93_regs regs)
 294{
 295        uchar asr;
 296        uchar x = 0;
 297
 298        write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
 299        write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO | 0x80);
 300        do {
 301                asr = read_aux_stat(regs);
 302                if (asr & ASR_DBR)
 303                        x = read_wd33c93(regs, WD_DATA);
 304        } while (!(asr & ASR_INT));
 305        return x;
 306}
 307
 308static int
 309round_period(unsigned int period, const struct sx_period *sx_table)
 310{
 311        int x;
 312
 313        for (x = 1; sx_table[x].period_ns; x++) {
 314                if ((period <= sx_table[x - 0].period_ns) &&
 315                    (period > sx_table[x - 1].period_ns)) {
 316                        return x;
 317                }
 318        }
 319        return 7;
 320}
 321
 322/*
 323 * Calculate Synchronous Transfer Register value from SDTR code.
 324 */
 325static uchar
 326calc_sync_xfer(unsigned int period, unsigned int offset, unsigned int fast,
 327               const struct sx_period *sx_table)
 328{
 329        /* When doing Fast SCSI synchronous data transfers, the corresponding
 330         * value in 'sx_table' is two times the actually used transfer period.
 331         */
 332        uchar result;
 333
 334        if (offset && fast) {
 335                fast = STR_FSS;
 336                period *= 2;
 337        } else {
 338                fast = 0;
 339        }
 340        period *= 4;            /* convert SDTR code to ns */
 341        result = sx_table[round_period(period,sx_table)].reg_value;
 342        result |= (offset < OPTIMUM_SX_OFF) ? offset : OPTIMUM_SX_OFF;
 343        result |= fast;
 344        return result;
 345}
 346
 347/*
 348 * Calculate SDTR code bytes [3],[4] from period and offset.
 349 */
 350static inline void
 351calc_sync_msg(unsigned int period, unsigned int offset, unsigned int fast,
 352                uchar  msg[2])
 353{
 354        /* 'period' is a "normal"-mode value, like the ones in 'sx_table'. The
 355         * actually used transfer period for Fast SCSI synchronous data
 356         * transfers is half that value.
 357         */
 358        period /= 4;
 359        if (offset && fast)
 360                period /= 2;
 361        msg[0] = period;
 362        msg[1] = offset;
 363}
 364
 365static int
 366wd33c93_queuecommand_lck(struct scsi_cmnd *cmd,
 367                void (*done)(struct scsi_cmnd *))
 368{
 369        struct WD33C93_hostdata *hostdata;
 370        struct scsi_cmnd *tmp;
 371
 372        hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata;
 373
 374        DB(DB_QUEUE_COMMAND,
 375           printk("Q-%d-%02x( ", cmd->device->id, cmd->cmnd[0]))
 376
 377/* Set up a few fields in the scsi_cmnd structure for our own use:
 378 *  - host_scribble is the pointer to the next cmd in the input queue
 379 *  - scsi_done points to the routine we call when a cmd is finished
 380 *  - result is what you'd expect
 381 */
 382        cmd->host_scribble = NULL;
 383        cmd->scsi_done = done;
 384        cmd->result = 0;
 385
 386/* We use the Scsi_Pointer structure that's included with each command
 387 * as a scratchpad (as it's intended to be used!). The handy thing about
 388 * the SCp.xxx fields is that they're always associated with a given
 389 * cmd, and are preserved across disconnect-reselect. This means we
 390 * can pretty much ignore SAVE_POINTERS and RESTORE_POINTERS messages
 391 * if we keep all the critical pointers and counters in SCp:
 392 *  - SCp.ptr is the pointer into the RAM buffer
 393 *  - SCp.this_residual is the size of that buffer
 394 *  - SCp.buffer points to the current scatter-gather buffer
 395 *  - SCp.buffers_residual tells us how many S.G. buffers there are
 396 *  - SCp.have_data_in is not used
 397 *  - SCp.sent_command is not used
 398 *  - SCp.phase records this command's SRCID_ER bit setting
 399 */
 400
 401        if (scsi_bufflen(cmd)) {
 402                cmd->SCp.buffer = scsi_sglist(cmd);
 403                cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
 404                cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
 405                cmd->SCp.this_residual = cmd->SCp.buffer->length;
 406        } else {
 407                cmd->SCp.buffer = NULL;
 408                cmd->SCp.buffers_residual = 0;
 409                cmd->SCp.ptr = NULL;
 410                cmd->SCp.this_residual = 0;
 411        }
 412
 413/* WD docs state that at the conclusion of a "LEVEL2" command, the
 414 * status byte can be retrieved from the LUN register. Apparently,
 415 * this is the case only for *uninterrupted* LEVEL2 commands! If
 416 * there are any unexpected phases entered, even if they are 100%
 417 * legal (different devices may choose to do things differently),
 418 * the LEVEL2 command sequence is exited. This often occurs prior
 419 * to receiving the status byte, in which case the driver does a
 420 * status phase interrupt and gets the status byte on its own.
 421 * While such a command can then be "resumed" (ie restarted to
 422 * finish up as a LEVEL2 command), the LUN register will NOT be
 423 * a valid status byte at the command's conclusion, and we must
 424 * use the byte obtained during the earlier interrupt. Here, we
 425 * preset SCp.Status to an illegal value (0xff) so that when
 426 * this command finally completes, we can tell where the actual
 427 * status byte is stored.
 428 */
 429
 430        cmd->SCp.Status = ILLEGAL_STATUS_BYTE;
 431
 432        /*
 433         * Add the cmd to the end of 'input_Q'. Note that REQUEST SENSE
 434         * commands are added to the head of the queue so that the desired
 435         * sense data is not lost before REQUEST_SENSE executes.
 436         */
 437
 438        spin_lock_irq(&hostdata->lock);
 439
 440        if (!(hostdata->input_Q) || (cmd->cmnd[0] == REQUEST_SENSE)) {
 441                cmd->host_scribble = (uchar *) hostdata->input_Q;
 442                hostdata->input_Q = cmd;
 443        } else {                /* find the end of the queue */
 444                for (tmp = (struct scsi_cmnd *) hostdata->input_Q;
 445                     tmp->host_scribble;
 446                     tmp = (struct scsi_cmnd *) tmp->host_scribble) ;
 447                tmp->host_scribble = (uchar *) cmd;
 448        }
 449
 450/* We know that there's at least one command in 'input_Q' now.
 451 * Go see if any of them are runnable!
 452 */
 453
 454        wd33c93_execute(cmd->device->host);
 455
 456        DB(DB_QUEUE_COMMAND, printk(")Q "))
 457
 458        spin_unlock_irq(&hostdata->lock);
 459        return 0;
 460}
 461
 462DEF_SCSI_QCMD(wd33c93_queuecommand)
 463
 464/*
 465 * This routine attempts to start a scsi command. If the host_card is
 466 * already connected, we give up immediately. Otherwise, look through
 467 * the input_Q, using the first command we find that's intended
 468 * for a currently non-busy target/lun.
 469 *
 470 * wd33c93_execute() is always called with interrupts disabled or from
 471 * the wd33c93_intr itself, which means that a wd33c93 interrupt
 472 * cannot occur while we are in here.
 473 */
 474static void
 475wd33c93_execute(struct Scsi_Host *instance)
 476{
 477        struct WD33C93_hostdata *hostdata =
 478            (struct WD33C93_hostdata *) instance->hostdata;
 479        const wd33c93_regs regs = hostdata->regs;
 480        struct scsi_cmnd *cmd, *prev;
 481
 482        DB(DB_EXECUTE, printk("EX("))
 483        if (hostdata->selecting || hostdata->connected) {
 484                DB(DB_EXECUTE, printk(")EX-0 "))
 485                return;
 486        }
 487
 488        /*
 489         * Search through the input_Q for a command destined
 490         * for an idle target/lun.
 491         */
 492
 493        cmd = (struct scsi_cmnd *) hostdata->input_Q;
 494        prev = NULL;
 495        while (cmd) {
 496                if (!(hostdata->busy[cmd->device->id] &
 497                      (1 << (cmd->device->lun & 0xff))))
 498                        break;
 499                prev = cmd;
 500                cmd = (struct scsi_cmnd *) cmd->host_scribble;
 501        }
 502
 503        /* quit if queue empty or all possible targets are busy */
 504
 505        if (!cmd) {
 506                DB(DB_EXECUTE, printk(")EX-1 "))
 507                return;
 508        }
 509
 510        /*  remove command from queue */
 511
 512        if (prev)
 513                prev->host_scribble = cmd->host_scribble;
 514        else
 515                hostdata->input_Q = (struct scsi_cmnd *) cmd->host_scribble;
 516
 517#ifdef PROC_STATISTICS
 518        hostdata->cmd_cnt[cmd->device->id]++;
 519#endif
 520
 521        /*
 522         * Start the selection process
 523         */
 524
 525        if (cmd->sc_data_direction == DMA_TO_DEVICE)
 526                write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id);
 527        else
 528                write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id | DSTID_DPD);
 529
 530/* Now we need to figure out whether or not this command is a good
 531 * candidate for disconnect/reselect. We guess to the best of our
 532 * ability, based on a set of hierarchical rules. When several
 533 * devices are operating simultaneously, disconnects are usually
 534 * an advantage. In a single device system, or if only 1 device
 535 * is being accessed, transfers usually go faster if disconnects
 536 * are not allowed:
 537 *
 538 * + Commands should NEVER disconnect if hostdata->disconnect =
 539 *   DIS_NEVER (this holds for tape drives also), and ALWAYS
 540 *   disconnect if hostdata->disconnect = DIS_ALWAYS.
 541 * + Tape drive commands should always be allowed to disconnect.
 542 * + Disconnect should be allowed if disconnected_Q isn't empty.
 543 * + Commands should NOT disconnect if input_Q is empty.
 544 * + Disconnect should be allowed if there are commands in input_Q
 545 *   for a different target/lun. In this case, the other commands
 546 *   should be made disconnect-able, if not already.
 547 *
 548 * I know, I know - this code would flunk me out of any
 549 * "C Programming 101" class ever offered. But it's easy
 550 * to change around and experiment with for now.
 551 */
 552
 553        cmd->SCp.phase = 0;     /* assume no disconnect */
 554        if (hostdata->disconnect == DIS_NEVER)
 555                goto no;
 556        if (hostdata->disconnect == DIS_ALWAYS)
 557                goto yes;
 558        if (cmd->device->type == 1)     /* tape drive? */
 559                goto yes;
 560        if (hostdata->disconnected_Q)   /* other commands disconnected? */
 561                goto yes;
 562        if (!(hostdata->input_Q))       /* input_Q empty? */
 563                goto no;
 564        for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev;
 565             prev = (struct scsi_cmnd *) prev->host_scribble) {
 566                if ((prev->device->id != cmd->device->id) ||
 567                    (prev->device->lun != cmd->device->lun)) {
 568                        for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev;
 569                             prev = (struct scsi_cmnd *) prev->host_scribble)
 570                                prev->SCp.phase = 1;
 571                        goto yes;
 572                }
 573        }
 574
 575        goto no;
 576
 577 yes:
 578        cmd->SCp.phase = 1;
 579
 580#ifdef PROC_STATISTICS
 581        hostdata->disc_allowed_cnt[cmd->device->id]++;
 582#endif
 583
 584 no:
 585
 586        write_wd33c93(regs, WD_SOURCE_ID, ((cmd->SCp.phase) ? SRCID_ER : 0));
 587
 588        write_wd33c93(regs, WD_TARGET_LUN, (u8)cmd->device->lun);
 589        write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
 590                      hostdata->sync_xfer[cmd->device->id]);
 591        hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF));
 592
 593        if ((hostdata->level2 == L2_NONE) ||
 594            (hostdata->sync_stat[cmd->device->id] == SS_UNSET)) {
 595
 596                /*
 597                 * Do a 'Select-With-ATN' command. This will end with
 598                 * one of the following interrupts:
 599                 *    CSR_RESEL_AM:  failure - can try again later.
 600                 *    CSR_TIMEOUT:   failure - give up.
 601                 *    CSR_SELECT:    success - proceed.
 602                 */
 603
 604                hostdata->selecting = cmd;
 605
 606/* Every target has its own synchronous transfer setting, kept in the
 607 * sync_xfer array, and a corresponding status byte in sync_stat[].
 608 * Each target's sync_stat[] entry is initialized to SX_UNSET, and its
 609 * sync_xfer[] entry is initialized to the default/safe value. SS_UNSET
 610 * means that the parameters are undetermined as yet, and that we
 611 * need to send an SDTR message to this device after selection is
 612 * complete: We set SS_FIRST to tell the interrupt routine to do so.
 613 * If we've been asked not to try synchronous transfers on this
 614 * target (and _all_ luns within it), we'll still send the SDTR message
 615 * later, but at that time we'll negotiate for async by specifying a
 616 * sync fifo depth of 0.
 617 */
 618                if (hostdata->sync_stat[cmd->device->id] == SS_UNSET)
 619                        hostdata->sync_stat[cmd->device->id] = SS_FIRST;
 620                hostdata->state = S_SELECTING;
 621                write_wd33c93_count(regs, 0);   /* guarantee a DATA_PHASE interrupt */
 622                write_wd33c93_cmd(regs, WD_CMD_SEL_ATN);
 623        } else {
 624
 625                /*
 626                 * Do a 'Select-With-ATN-Xfer' command. This will end with
 627                 * one of the following interrupts:
 628                 *    CSR_RESEL_AM:  failure - can try again later.
 629                 *    CSR_TIMEOUT:   failure - give up.
 630                 *    anything else: success - proceed.
 631                 */
 632
 633                hostdata->connected = cmd;
 634                write_wd33c93(regs, WD_COMMAND_PHASE, 0);
 635
 636                /* copy command_descriptor_block into WD chip
 637                 * (take advantage of auto-incrementing)
 638                 */
 639
 640                write_wd33c93_cdb(regs, cmd->cmd_len, cmd->cmnd);
 641
 642                /* The wd33c93 only knows about Group 0, 1, and 5 commands when
 643                 * it's doing a 'select-and-transfer'. To be safe, we write the
 644                 * size of the CDB into the OWN_ID register for every case. This
 645                 * way there won't be problems with vendor-unique, audio, etc.
 646                 */
 647
 648                write_wd33c93(regs, WD_OWN_ID, cmd->cmd_len);
 649
 650                /* When doing a non-disconnect command with DMA, we can save
 651                 * ourselves a DATA phase interrupt later by setting everything
 652                 * up ahead of time.
 653                 */
 654
 655                if ((cmd->SCp.phase == 0) && (hostdata->no_dma == 0)) {
 656                        if (hostdata->dma_setup(cmd,
 657                            (cmd->sc_data_direction == DMA_TO_DEVICE) ?
 658                             DATA_OUT_DIR : DATA_IN_DIR))
 659                                write_wd33c93_count(regs, 0);   /* guarantee a DATA_PHASE interrupt */
 660                        else {
 661                                write_wd33c93_count(regs,
 662                                                    cmd->SCp.this_residual);
 663                                write_wd33c93(regs, WD_CONTROL,
 664                                              CTRL_IDI | CTRL_EDI | hostdata->dma_mode);
 665                                hostdata->dma = D_DMA_RUNNING;
 666                        }
 667                } else
 668                        write_wd33c93_count(regs, 0);   /* guarantee a DATA_PHASE interrupt */
 669
 670                hostdata->state = S_RUNNING_LEVEL2;
 671                write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
 672        }
 673
 674        /*
 675         * Since the SCSI bus can handle only 1 connection at a time,
 676         * we get out of here now. If the selection fails, or when
 677         * the command disconnects, we'll come back to this routine
 678         * to search the input_Q again...
 679         */
 680
 681        DB(DB_EXECUTE,
 682           printk("%s)EX-2 ", (cmd->SCp.phase) ? "d:" : ""))
 683}
 684
 685static void
 686transfer_pio(const wd33c93_regs regs, uchar * buf, int cnt,
 687             int data_in_dir, struct WD33C93_hostdata *hostdata)
 688{
 689        uchar asr;
 690
 691        DB(DB_TRANSFER,
 692           printk("(%p,%d,%s:", buf, cnt, data_in_dir ? "in" : "out"))
 693
 694        write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
 695        write_wd33c93_count(regs, cnt);
 696        write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO);
 697        if (data_in_dir) {
 698                do {
 699                        asr = read_aux_stat(regs);
 700                        if (asr & ASR_DBR)
 701                                *buf++ = read_wd33c93(regs, WD_DATA);
 702                } while (!(asr & ASR_INT));
 703        } else {
 704                do {
 705                        asr = read_aux_stat(regs);
 706                        if (asr & ASR_DBR)
 707                                write_wd33c93(regs, WD_DATA, *buf++);
 708                } while (!(asr & ASR_INT));
 709        }
 710
 711        /* Note: we are returning with the interrupt UN-cleared.
 712         * Since (presumably) an entire I/O operation has
 713         * completed, the bus phase is probably different, and
 714         * the interrupt routine will discover this when it
 715         * responds to the uncleared int.
 716         */
 717
 718}
 719
 720static void
 721transfer_bytes(const wd33c93_regs regs, struct scsi_cmnd *cmd,
 722                int data_in_dir)
 723{
 724        struct WD33C93_hostdata *hostdata;
 725        unsigned long length;
 726
 727        hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata;
 728
 729/* Normally, you'd expect 'this_residual' to be non-zero here.
 730 * In a series of scatter-gather transfers, however, this
 731 * routine will usually be called with 'this_residual' equal
 732 * to 0 and 'buffers_residual' non-zero. This means that a
 733 * previous transfer completed, clearing 'this_residual', and
 734 * now we need to setup the next scatter-gather buffer as the
 735 * source or destination for THIS transfer.
 736 */
 737        if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
 738                cmd->SCp.buffer = sg_next(cmd->SCp.buffer);
 739                --cmd->SCp.buffers_residual;
 740                cmd->SCp.this_residual = cmd->SCp.buffer->length;
 741                cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
 742        }
 743        if (!cmd->SCp.this_residual) /* avoid bogus setups */
 744                return;
 745
 746        write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
 747                      hostdata->sync_xfer[cmd->device->id]);
 748
 749/* 'hostdata->no_dma' is TRUE if we don't even want to try DMA.
 750 * Update 'this_residual' and 'ptr' after 'transfer_pio()' returns.
 751 */
 752
 753        if (hostdata->no_dma || hostdata->dma_setup(cmd, data_in_dir)) {
 754#ifdef PROC_STATISTICS
 755                hostdata->pio_cnt++;
 756#endif
 757                transfer_pio(regs, (uchar *) cmd->SCp.ptr,
 758                             cmd->SCp.this_residual, data_in_dir, hostdata);
 759                length = cmd->SCp.this_residual;
 760                cmd->SCp.this_residual = read_wd33c93_count(regs);
 761                cmd->SCp.ptr += (length - cmd->SCp.this_residual);
 762        }
 763
 764/* We are able to do DMA (in fact, the Amiga hardware is
 765 * already going!), so start up the wd33c93 in DMA mode.
 766 * We set 'hostdata->dma' = D_DMA_RUNNING so that when the
 767 * transfer completes and causes an interrupt, we're
 768 * reminded to tell the Amiga to shut down its end. We'll
 769 * postpone the updating of 'this_residual' and 'ptr'
 770 * until then.
 771 */
 772
 773        else {
 774#ifdef PROC_STATISTICS
 775                hostdata->dma_cnt++;
 776#endif
 777                write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | hostdata->dma_mode);
 778                write_wd33c93_count(regs, cmd->SCp.this_residual);
 779
 780                if ((hostdata->level2 >= L2_DATA) ||
 781                    (hostdata->level2 == L2_BASIC && cmd->SCp.phase == 0)) {
 782                        write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
 783                        write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
 784                        hostdata->state = S_RUNNING_LEVEL2;
 785                } else
 786                        write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO);
 787
 788                hostdata->dma = D_DMA_RUNNING;
 789        }
 790}
 791
 792void
 793wd33c93_intr(struct Scsi_Host *instance)
 794{
 795        struct WD33C93_hostdata *hostdata =
 796            (struct WD33C93_hostdata *) instance->hostdata;
 797        const wd33c93_regs regs = hostdata->regs;
 798        struct scsi_cmnd *patch, *cmd;
 799        uchar asr, sr, phs, id, lun, *ucp, msg;
 800        unsigned long length, flags;
 801
 802        asr = read_aux_stat(regs);
 803        if (!(asr & ASR_INT) || (asr & ASR_BSY))
 804                return;
 805
 806        spin_lock_irqsave(&hostdata->lock, flags);
 807
 808#ifdef PROC_STATISTICS
 809        hostdata->int_cnt++;
 810#endif
 811
 812        cmd = (struct scsi_cmnd *) hostdata->connected; /* assume we're connected */
 813        sr = read_wd33c93(regs, WD_SCSI_STATUS);        /* clear the interrupt */
 814        phs = read_wd33c93(regs, WD_COMMAND_PHASE);
 815
 816        DB(DB_INTR, printk("{%02x:%02x-", asr, sr))
 817
 818/* After starting a DMA transfer, the next interrupt
 819 * is guaranteed to be in response to completion of
 820 * the transfer. Since the Amiga DMA hardware runs in
 821 * in an open-ended fashion, it needs to be told when
 822 * to stop; do that here if D_DMA_RUNNING is true.
 823 * Also, we have to update 'this_residual' and 'ptr'
 824 * based on the contents of the TRANSFER_COUNT register,
 825 * in case the device decided to do an intermediate
 826 * disconnect (a device may do this if it has to do a
 827 * seek, or just to be nice and let other devices have
 828 * some bus time during long transfers). After doing
 829 * whatever is needed, we go on and service the WD3393
 830 * interrupt normally.
 831 */
 832            if (hostdata->dma == D_DMA_RUNNING) {
 833                DB(DB_TRANSFER,
 834                   printk("[%p/%d:", cmd->SCp.ptr, cmd->SCp.this_residual))
 835                    hostdata->dma_stop(cmd->device->host, cmd, 1);
 836                hostdata->dma = D_DMA_OFF;
 837                length = cmd->SCp.this_residual;
 838                cmd->SCp.this_residual = read_wd33c93_count(regs);
 839                cmd->SCp.ptr += (length - cmd->SCp.this_residual);
 840                DB(DB_TRANSFER,
 841                   printk("%p/%d]", cmd->SCp.ptr, cmd->SCp.this_residual))
 842        }
 843
 844/* Respond to the specific WD3393 interrupt - there are quite a few! */
 845        switch (sr) {
 846        case CSR_TIMEOUT:
 847                DB(DB_INTR, printk("TIMEOUT"))
 848
 849                    if (hostdata->state == S_RUNNING_LEVEL2)
 850                        hostdata->connected = NULL;
 851                else {
 852                        cmd = (struct scsi_cmnd *) hostdata->selecting; /* get a valid cmd */
 853                        hostdata->selecting = NULL;
 854                }
 855
 856                cmd->result = DID_NO_CONNECT << 16;
 857                hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
 858                hostdata->state = S_UNCONNECTED;
 859                cmd->scsi_done(cmd);
 860
 861                /* From esp.c:
 862                 * There is a window of time within the scsi_done() path
 863                 * of execution where interrupts are turned back on full
 864                 * blast and left that way.  During that time we could
 865                 * reconnect to a disconnected command, then we'd bomb
 866                 * out below.  We could also end up executing two commands
 867                 * at _once_.  ...just so you know why the restore_flags()
 868                 * is here...
 869                 */
 870
 871                spin_unlock_irqrestore(&hostdata->lock, flags);
 872
 873/* We are not connected to a target - check to see if there
 874 * are commands waiting to be executed.
 875 */
 876
 877                wd33c93_execute(instance);
 878                break;
 879
 880/* Note: this interrupt should not occur in a LEVEL2 command */
 881
 882        case CSR_SELECT:
 883                DB(DB_INTR, printk("SELECT"))
 884                    hostdata->connected = cmd =
 885                    (struct scsi_cmnd *) hostdata->selecting;
 886                hostdata->selecting = NULL;
 887
 888                /* construct an IDENTIFY message with correct disconnect bit */
 889
 890                hostdata->outgoing_msg[0] = IDENTIFY(0, cmd->device->lun);
 891                if (cmd->SCp.phase)
 892                        hostdata->outgoing_msg[0] |= 0x40;
 893
 894                if (hostdata->sync_stat[cmd->device->id] == SS_FIRST) {
 895
 896                        hostdata->sync_stat[cmd->device->id] = SS_WAITING;
 897
 898/* Tack on a 2nd message to ask about synchronous transfers. If we've
 899 * been asked to do only asynchronous transfers on this device, we
 900 * request a fifo depth of 0, which is equivalent to async - should
 901 * solve the problems some people have had with GVP's Guru ROM.
 902 */
 903
 904                        hostdata->outgoing_msg[1] = EXTENDED_MESSAGE;
 905                        hostdata->outgoing_msg[2] = 3;
 906                        hostdata->outgoing_msg[3] = EXTENDED_SDTR;
 907                        if (hostdata->no_sync & (1 << cmd->device->id)) {
 908                                calc_sync_msg(hostdata->default_sx_per, 0,
 909                                                0, hostdata->outgoing_msg + 4);
 910                        } else {
 911                                calc_sync_msg(optimum_sx_per(hostdata),
 912                                                OPTIMUM_SX_OFF,
 913                                                hostdata->fast,
 914                                                hostdata->outgoing_msg + 4);
 915                        }
 916                        hostdata->outgoing_len = 6;
 917#ifdef SYNC_DEBUG
 918                        ucp = hostdata->outgoing_msg + 1;
 919                        printk(" sending SDTR %02x03%02x%02x%02x ",
 920                                ucp[0], ucp[2], ucp[3], ucp[4]);
 921#endif
 922                } else
 923                        hostdata->outgoing_len = 1;
 924
 925                hostdata->state = S_CONNECTED;
 926                spin_unlock_irqrestore(&hostdata->lock, flags);
 927                break;
 928
 929        case CSR_XFER_DONE | PHS_DATA_IN:
 930        case CSR_UNEXP | PHS_DATA_IN:
 931        case CSR_SRV_REQ | PHS_DATA_IN:
 932                DB(DB_INTR,
 933                   printk("IN-%d.%d", cmd->SCp.this_residual,
 934                          cmd->SCp.buffers_residual))
 935                    transfer_bytes(regs, cmd, DATA_IN_DIR);
 936                if (hostdata->state != S_RUNNING_LEVEL2)
 937                        hostdata->state = S_CONNECTED;
 938                spin_unlock_irqrestore(&hostdata->lock, flags);
 939                break;
 940
 941        case CSR_XFER_DONE | PHS_DATA_OUT:
 942        case CSR_UNEXP | PHS_DATA_OUT:
 943        case CSR_SRV_REQ | PHS_DATA_OUT:
 944                DB(DB_INTR,
 945                   printk("OUT-%d.%d", cmd->SCp.this_residual,
 946                          cmd->SCp.buffers_residual))
 947                    transfer_bytes(regs, cmd, DATA_OUT_DIR);
 948                if (hostdata->state != S_RUNNING_LEVEL2)
 949                        hostdata->state = S_CONNECTED;
 950                spin_unlock_irqrestore(&hostdata->lock, flags);
 951                break;
 952
 953/* Note: this interrupt should not occur in a LEVEL2 command */
 954
 955        case CSR_XFER_DONE | PHS_COMMAND:
 956        case CSR_UNEXP | PHS_COMMAND:
 957        case CSR_SRV_REQ | PHS_COMMAND:
 958                DB(DB_INTR, printk("CMND-%02x", cmd->cmnd[0]))
 959                    transfer_pio(regs, cmd->cmnd, cmd->cmd_len, DATA_OUT_DIR,
 960                                 hostdata);
 961                hostdata->state = S_CONNECTED;
 962                spin_unlock_irqrestore(&hostdata->lock, flags);
 963                break;
 964
 965        case CSR_XFER_DONE | PHS_STATUS:
 966        case CSR_UNEXP | PHS_STATUS:
 967        case CSR_SRV_REQ | PHS_STATUS:
 968                DB(DB_INTR, printk("STATUS="))
 969                cmd->SCp.Status = read_1_byte(regs);
 970                DB(DB_INTR, printk("%02x", cmd->SCp.Status))
 971                    if (hostdata->level2 >= L2_BASIC) {
 972                        sr = read_wd33c93(regs, WD_SCSI_STATUS);        /* clear interrupt */
 973                        udelay(7);
 974                        hostdata->state = S_RUNNING_LEVEL2;
 975                        write_wd33c93(regs, WD_COMMAND_PHASE, 0x50);
 976                        write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
 977                } else {
 978                        hostdata->state = S_CONNECTED;
 979                }
 980                spin_unlock_irqrestore(&hostdata->lock, flags);
 981                break;
 982
 983        case CSR_XFER_DONE | PHS_MESS_IN:
 984        case CSR_UNEXP | PHS_MESS_IN:
 985        case CSR_SRV_REQ | PHS_MESS_IN:
 986                DB(DB_INTR, printk("MSG_IN="))
 987
 988                msg = read_1_byte(regs);
 989                sr = read_wd33c93(regs, WD_SCSI_STATUS);        /* clear interrupt */
 990                udelay(7);
 991
 992                hostdata->incoming_msg[hostdata->incoming_ptr] = msg;
 993                if (hostdata->incoming_msg[0] == EXTENDED_MESSAGE)
 994                        msg = EXTENDED_MESSAGE;
 995                else
 996                        hostdata->incoming_ptr = 0;
 997
 998                cmd->SCp.Message = msg;
 999                switch (msg) {
1000
1001                case COMMAND_COMPLETE:
1002                        DB(DB_INTR, printk("CCMP"))
1003                            write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1004                        hostdata->state = S_PRE_CMP_DISC;
1005                        break;
1006
1007                case SAVE_POINTERS:
1008                        DB(DB_INTR, printk("SDP"))
1009                            write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1010                        hostdata->state = S_CONNECTED;
1011                        break;
1012
1013                case RESTORE_POINTERS:
1014                        DB(DB_INTR, printk("RDP"))
1015                            if (hostdata->level2 >= L2_BASIC) {
1016                                write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
1017                                write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
1018                                hostdata->state = S_RUNNING_LEVEL2;
1019                        } else {
1020                                write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1021                                hostdata->state = S_CONNECTED;
1022                        }
1023                        break;
1024
1025                case DISCONNECT:
1026                        DB(DB_INTR, printk("DIS"))
1027                            cmd->device->disconnect = 1;
1028                        write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1029                        hostdata->state = S_PRE_TMP_DISC;
1030                        break;
1031
1032                case MESSAGE_REJECT:
1033                        DB(DB_INTR, printk("REJ"))
1034#ifdef SYNC_DEBUG
1035                            printk("-REJ-");
1036#endif
1037                        if (hostdata->sync_stat[cmd->device->id] == SS_WAITING) {
1038                                hostdata->sync_stat[cmd->device->id] = SS_SET;
1039                                /* we want default_sx_per, not DEFAULT_SX_PER */
1040                                hostdata->sync_xfer[cmd->device->id] =
1041                                        calc_sync_xfer(hostdata->default_sx_per
1042                                                / 4, 0, 0, hostdata->sx_table);
1043                        }
1044                        write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1045                        hostdata->state = S_CONNECTED;
1046                        break;
1047
1048                case EXTENDED_MESSAGE:
1049                        DB(DB_INTR, printk("EXT"))
1050
1051                            ucp = hostdata->incoming_msg;
1052
1053#ifdef SYNC_DEBUG
1054                        printk("%02x", ucp[hostdata->incoming_ptr]);
1055#endif
1056                        /* Is this the last byte of the extended message? */
1057
1058                        if ((hostdata->incoming_ptr >= 2) &&
1059                            (hostdata->incoming_ptr == (ucp[1] + 1))) {
1060
1061                                switch (ucp[2]) {       /* what's the EXTENDED code? */
1062                                case EXTENDED_SDTR:
1063                                        /* default to default async period */
1064                                        id = calc_sync_xfer(hostdata->
1065                                                        default_sx_per / 4, 0,
1066                                                        0, hostdata->sx_table);
1067                                        if (hostdata->sync_stat[cmd->device->id] !=
1068                                            SS_WAITING) {
1069
1070/* A device has sent an unsolicited SDTR message; rather than go
1071 * through the effort of decoding it and then figuring out what
1072 * our reply should be, we're just gonna say that we have a
1073 * synchronous fifo depth of 0. This will result in asynchronous
1074 * transfers - not ideal but so much easier.
1075 * Actually, this is OK because it assures us that if we don't
1076 * specifically ask for sync transfers, we won't do any.
1077 */
1078
1079                                                write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1080                                                hostdata->outgoing_msg[0] =
1081                                                    EXTENDED_MESSAGE;
1082                                                hostdata->outgoing_msg[1] = 3;
1083                                                hostdata->outgoing_msg[2] =
1084                                                    EXTENDED_SDTR;
1085                                                calc_sync_msg(hostdata->
1086                                                        default_sx_per, 0,
1087                                                        0, hostdata->outgoing_msg + 3);
1088                                                hostdata->outgoing_len = 5;
1089                                        } else {
1090                                                if (ucp[4]) /* well, sync transfer */
1091                                                        id = calc_sync_xfer(ucp[3], ucp[4],
1092                                                                        hostdata->fast,
1093                                                                        hostdata->sx_table);
1094                                                else if (ucp[3]) /* very unlikely... */
1095                                                        id = calc_sync_xfer(ucp[3], ucp[4],
1096                                                                        0, hostdata->sx_table);
1097                                        }
1098                                        hostdata->sync_xfer[cmd->device->id] = id;
1099#ifdef SYNC_DEBUG
1100                                        printk(" sync_xfer=%02x\n",
1101                                               hostdata->sync_xfer[cmd->device->id]);
1102#endif
1103                                        hostdata->sync_stat[cmd->device->id] =
1104                                            SS_SET;
1105                                        write_wd33c93_cmd(regs,
1106                                                          WD_CMD_NEGATE_ACK);
1107                                        hostdata->state = S_CONNECTED;
1108                                        break;
1109                                case EXTENDED_WDTR:
1110                                        write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1111                                        printk("sending WDTR ");
1112                                        hostdata->outgoing_msg[0] =
1113                                            EXTENDED_MESSAGE;
1114                                        hostdata->outgoing_msg[1] = 2;
1115                                        hostdata->outgoing_msg[2] =
1116                                            EXTENDED_WDTR;
1117                                        hostdata->outgoing_msg[3] = 0;  /* 8 bit transfer width */
1118                                        hostdata->outgoing_len = 4;
1119                                        write_wd33c93_cmd(regs,
1120                                                          WD_CMD_NEGATE_ACK);
1121                                        hostdata->state = S_CONNECTED;
1122                                        break;
1123                                default:
1124                                        write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1125                                        printk
1126                                            ("Rejecting Unknown Extended Message(%02x). ",
1127                                             ucp[2]);
1128                                        hostdata->outgoing_msg[0] =
1129                                            MESSAGE_REJECT;
1130                                        hostdata->outgoing_len = 1;
1131                                        write_wd33c93_cmd(regs,
1132                                                          WD_CMD_NEGATE_ACK);
1133                                        hostdata->state = S_CONNECTED;
1134                                        break;
1135                                }
1136                                hostdata->incoming_ptr = 0;
1137                        }
1138
1139                        /* We need to read more MESS_IN bytes for the extended message */
1140
1141                        else {
1142                                hostdata->incoming_ptr++;
1143                                write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1144                                hostdata->state = S_CONNECTED;
1145                        }
1146                        break;
1147
1148                default:
1149                        printk("Rejecting Unknown Message(%02x) ", msg);
1150                        write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1151                        hostdata->outgoing_msg[0] = MESSAGE_REJECT;
1152                        hostdata->outgoing_len = 1;
1153                        write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1154                        hostdata->state = S_CONNECTED;
1155                }
1156                spin_unlock_irqrestore(&hostdata->lock, flags);
1157                break;
1158
1159/* Note: this interrupt will occur only after a LEVEL2 command */
1160
1161        case CSR_SEL_XFER_DONE:
1162
1163/* Make sure that reselection is enabled at this point - it may
1164 * have been turned off for the command that just completed.
1165 */
1166
1167                write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
1168                if (phs == 0x60) {
1169                        DB(DB_INTR, printk("SX-DONE"))
1170                            cmd->SCp.Message = COMMAND_COMPLETE;
1171                        lun = read_wd33c93(regs, WD_TARGET_LUN);
1172                        DB(DB_INTR, printk(":%d.%d", cmd->SCp.Status, lun))
1173                            hostdata->connected = NULL;
1174                        hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
1175                        hostdata->state = S_UNCONNECTED;
1176                        if (cmd->SCp.Status == ILLEGAL_STATUS_BYTE)
1177                                cmd->SCp.Status = lun;
1178                        if (cmd->cmnd[0] == REQUEST_SENSE
1179                            && cmd->SCp.Status != SAM_STAT_GOOD)
1180                                cmd->result =
1181                                    (cmd->
1182                                     result & 0x00ffff) | (DID_ERROR << 16);
1183                        else
1184                                cmd->result =
1185                                    cmd->SCp.Status | (cmd->SCp.Message << 8);
1186                        cmd->scsi_done(cmd);
1187
1188/* We are no longer  connected to a target - check to see if
1189 * there are commands waiting to be executed.
1190 */
1191                        spin_unlock_irqrestore(&hostdata->lock, flags);
1192                        wd33c93_execute(instance);
1193                } else {
1194                        printk
1195                            ("%02x:%02x:%02x: Unknown SEL_XFER_DONE phase!!---",
1196                             asr, sr, phs);
1197                        spin_unlock_irqrestore(&hostdata->lock, flags);
1198                }
1199                break;
1200
1201/* Note: this interrupt will occur only after a LEVEL2 command */
1202
1203        case CSR_SDP:
1204                DB(DB_INTR, printk("SDP"))
1205                    hostdata->state = S_RUNNING_LEVEL2;
1206                write_wd33c93(regs, WD_COMMAND_PHASE, 0x41);
1207                write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
1208                spin_unlock_irqrestore(&hostdata->lock, flags);
1209                break;
1210
1211        case CSR_XFER_DONE | PHS_MESS_OUT:
1212        case CSR_UNEXP | PHS_MESS_OUT:
1213        case CSR_SRV_REQ | PHS_MESS_OUT:
1214                DB(DB_INTR, printk("MSG_OUT="))
1215
1216/* To get here, we've probably requested MESSAGE_OUT and have
1217 * already put the correct bytes in outgoing_msg[] and filled
1218 * in outgoing_len. We simply send them out to the SCSI bus.
1219 * Sometimes we get MESSAGE_OUT phase when we're not expecting
1220 * it - like when our SDTR message is rejected by a target. Some
1221 * targets send the REJECT before receiving all of the extended
1222 * message, and then seem to go back to MESSAGE_OUT for a byte
1223 * or two. Not sure why, or if I'm doing something wrong to
1224 * cause this to happen. Regardless, it seems that sending
1225 * NOP messages in these situations results in no harm and
1226 * makes everyone happy.
1227 */
1228                    if (hostdata->outgoing_len == 0) {
1229                        hostdata->outgoing_len = 1;
1230                        hostdata->outgoing_msg[0] = NOP;
1231                }
1232                transfer_pio(regs, hostdata->outgoing_msg,
1233                             hostdata->outgoing_len, DATA_OUT_DIR, hostdata);
1234                DB(DB_INTR, printk("%02x", hostdata->outgoing_msg[0]))
1235                    hostdata->outgoing_len = 0;
1236                hostdata->state = S_CONNECTED;
1237                spin_unlock_irqrestore(&hostdata->lock, flags);
1238                break;
1239
1240        case CSR_UNEXP_DISC:
1241
1242/* I think I've seen this after a request-sense that was in response
1243 * to an error condition, but not sure. We certainly need to do
1244 * something when we get this interrupt - the question is 'what?'.
1245 * Let's think positively, and assume some command has finished
1246 * in a legal manner (like a command that provokes a request-sense),
1247 * so we treat it as a normal command-complete-disconnect.
1248 */
1249
1250/* Make sure that reselection is enabled at this point - it may
1251 * have been turned off for the command that just completed.
1252 */
1253
1254                write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
1255                if (cmd == NULL) {
1256                        printk(" - Already disconnected! ");
1257                        hostdata->state = S_UNCONNECTED;
1258                        spin_unlock_irqrestore(&hostdata->lock, flags);
1259                        return;
1260                }
1261                DB(DB_INTR, printk("UNEXP_DISC"))
1262                    hostdata->connected = NULL;
1263                hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
1264                hostdata->state = S_UNCONNECTED;
1265                if (cmd->cmnd[0] == REQUEST_SENSE && cmd->SCp.Status != SAM_STAT_GOOD)
1266                        cmd->result =
1267                            (cmd->result & 0x00ffff) | (DID_ERROR << 16);
1268                else
1269                        cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
1270                cmd->scsi_done(cmd);
1271
1272/* We are no longer connected to a target - check to see if
1273 * there are commands waiting to be executed.
1274 */
1275                /* look above for comments on scsi_done() */
1276                spin_unlock_irqrestore(&hostdata->lock, flags);
1277                wd33c93_execute(instance);
1278                break;
1279
1280        case CSR_DISC:
1281
1282/* Make sure that reselection is enabled at this point - it may
1283 * have been turned off for the command that just completed.
1284 */
1285
1286                write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
1287                DB(DB_INTR, printk("DISC"))
1288                    if (cmd == NULL) {
1289                        printk(" - Already disconnected! ");
1290                        hostdata->state = S_UNCONNECTED;
1291                }
1292                switch (hostdata->state) {
1293                case S_PRE_CMP_DISC:
1294                        hostdata->connected = NULL;
1295                        hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
1296                        hostdata->state = S_UNCONNECTED;
1297                        DB(DB_INTR, printk(":%d", cmd->SCp.Status))
1298                            if (cmd->cmnd[0] == REQUEST_SENSE
1299                                && cmd->SCp.Status != SAM_STAT_GOOD)
1300                                cmd->result =
1301                                    (cmd->
1302                                     result & 0x00ffff) | (DID_ERROR << 16);
1303                        else
1304                                cmd->result =
1305                                    cmd->SCp.Status | (cmd->SCp.Message << 8);
1306                        cmd->scsi_done(cmd);
1307                        break;
1308                case S_PRE_TMP_DISC:
1309                case S_RUNNING_LEVEL2:
1310                        cmd->host_scribble = (uchar *) hostdata->disconnected_Q;
1311                        hostdata->disconnected_Q = cmd;
1312                        hostdata->connected = NULL;
1313                        hostdata->state = S_UNCONNECTED;
1314
1315#ifdef PROC_STATISTICS
1316                        hostdata->disc_done_cnt[cmd->device->id]++;
1317#endif
1318
1319                        break;
1320                default:
1321                        printk("*** Unexpected DISCONNECT interrupt! ***");
1322                        hostdata->state = S_UNCONNECTED;
1323                }
1324
1325/* We are no longer connected to a target - check to see if
1326 * there are commands waiting to be executed.
1327 */
1328                spin_unlock_irqrestore(&hostdata->lock, flags);
1329                wd33c93_execute(instance);
1330                break;
1331
1332        case CSR_RESEL_AM:
1333        case CSR_RESEL:
1334                DB(DB_INTR, printk("RESEL%s", sr == CSR_RESEL_AM ? "_AM" : ""))
1335
1336                    /* Old chips (pre -A ???) don't have advanced features and will
1337                     * generate CSR_RESEL.  In that case we have to extract the LUN the
1338                     * hard way (see below).
1339                     * First we have to make sure this reselection didn't
1340                     * happen during Arbitration/Selection of some other device.
1341                     * If yes, put losing command back on top of input_Q.
1342                     */
1343                    if (hostdata->level2 <= L2_NONE) {
1344
1345                        if (hostdata->selecting) {
1346                                cmd = (struct scsi_cmnd *) hostdata->selecting;
1347                                hostdata->selecting = NULL;
1348                                hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
1349                                cmd->host_scribble =
1350                                    (uchar *) hostdata->input_Q;
1351                                hostdata->input_Q = cmd;
1352                        }
1353                }
1354
1355                else {
1356
1357                        if (cmd) {
1358                                if (phs == 0x00) {
1359                                        hostdata->busy[cmd->device->id] &=
1360                                                ~(1 << (cmd->device->lun & 0xff));
1361                                        cmd->host_scribble =
1362                                            (uchar *) hostdata->input_Q;
1363                                        hostdata->input_Q = cmd;
1364                                } else {
1365                                        printk
1366                                            ("---%02x:%02x:%02x-TROUBLE: Intrusive ReSelect!---",
1367                                             asr, sr, phs);
1368                                        while (1)
1369                                                printk("\r");
1370                                }
1371                        }
1372
1373                }
1374
1375                /* OK - find out which device reselected us. */
1376
1377                id = read_wd33c93(regs, WD_SOURCE_ID);
1378                id &= SRCID_MASK;
1379
1380                /* and extract the lun from the ID message. (Note that we don't
1381                 * bother to check for a valid message here - I guess this is
1382                 * not the right way to go, but...)
1383                 */
1384
1385                if (sr == CSR_RESEL_AM) {
1386                        lun = read_wd33c93(regs, WD_DATA);
1387                        if (hostdata->level2 < L2_RESELECT)
1388                                write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1389                        lun &= 7;
1390                } else {
1391                        /* Old chip; wait for msgin phase to pick up the LUN. */
1392                        for (lun = 255; lun; lun--) {
1393                                if ((asr = read_aux_stat(regs)) & ASR_INT)
1394                                        break;
1395                                udelay(10);
1396                        }
1397                        if (!(asr & ASR_INT)) {
1398                                printk
1399                                    ("wd33c93: Reselected without IDENTIFY\n");
1400                                lun = 0;
1401                        } else {
1402                                /* Verify this is a change to MSG_IN and read the message */
1403                                sr = read_wd33c93(regs, WD_SCSI_STATUS);
1404                                udelay(7);
1405                                if (sr == (CSR_ABORT | PHS_MESS_IN) ||
1406                                    sr == (CSR_UNEXP | PHS_MESS_IN) ||
1407                                    sr == (CSR_SRV_REQ | PHS_MESS_IN)) {
1408                                        /* Got MSG_IN, grab target LUN */
1409                                        lun = read_1_byte(regs);
1410                                        /* Now we expect a 'paused with ACK asserted' int.. */
1411                                        asr = read_aux_stat(regs);
1412                                        if (!(asr & ASR_INT)) {
1413                                                udelay(10);
1414                                                asr = read_aux_stat(regs);
1415                                                if (!(asr & ASR_INT))
1416                                                        printk
1417                                                            ("wd33c93: No int after LUN on RESEL (%02x)\n",
1418                                                             asr);
1419                                        }
1420                                        sr = read_wd33c93(regs, WD_SCSI_STATUS);
1421                                        udelay(7);
1422                                        if (sr != CSR_MSGIN)
1423                                                printk
1424                                                    ("wd33c93: Not paused with ACK on RESEL (%02x)\n",
1425                                                     sr);
1426                                        lun &= 7;
1427                                        write_wd33c93_cmd(regs,
1428                                                          WD_CMD_NEGATE_ACK);
1429                                } else {
1430                                        printk
1431                                            ("wd33c93: Not MSG_IN on reselect (%02x)\n",
1432                                             sr);
1433                                        lun = 0;
1434                                }
1435                        }
1436                }
1437
1438                /* Now we look for the command that's reconnecting. */
1439
1440                cmd = (struct scsi_cmnd *) hostdata->disconnected_Q;
1441                patch = NULL;
1442                while (cmd) {
1443                        if (id == cmd->device->id && lun == (u8)cmd->device->lun)
1444                                break;
1445                        patch = cmd;
1446                        cmd = (struct scsi_cmnd *) cmd->host_scribble;
1447                }
1448
1449                /* Hmm. Couldn't find a valid command.... What to do? */
1450
1451                if (!cmd) {
1452                        printk
1453                            ("---TROUBLE: target %d.%d not in disconnect queue---",
1454                             id, (u8)lun);
1455                        spin_unlock_irqrestore(&hostdata->lock, flags);
1456                        return;
1457                }
1458
1459                /* Ok, found the command - now start it up again. */
1460
1461                if (patch)
1462                        patch->host_scribble = cmd->host_scribble;
1463                else
1464                        hostdata->disconnected_Q =
1465                            (struct scsi_cmnd *) cmd->host_scribble;
1466                hostdata->connected = cmd;
1467
1468                /* We don't need to worry about 'initialize_SCp()' or 'hostdata->busy[]'
1469                 * because these things are preserved over a disconnect.
1470                 * But we DO need to fix the DPD bit so it's correct for this command.
1471                 */
1472
1473                if (cmd->sc_data_direction == DMA_TO_DEVICE)
1474                        write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id);
1475                else
1476                        write_wd33c93(regs, WD_DESTINATION_ID,
1477                                      cmd->device->id | DSTID_DPD);
1478                if (hostdata->level2 >= L2_RESELECT) {
1479                        write_wd33c93_count(regs, 0);   /* we want a DATA_PHASE interrupt */
1480                        write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
1481                        write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
1482                        hostdata->state = S_RUNNING_LEVEL2;
1483                } else
1484                        hostdata->state = S_CONNECTED;
1485
1486                    spin_unlock_irqrestore(&hostdata->lock, flags);
1487                break;
1488
1489        default:
1490                printk("--UNKNOWN INTERRUPT:%02x:%02x:%02x--", asr, sr, phs);
1491                spin_unlock_irqrestore(&hostdata->lock, flags);
1492        }
1493
1494        DB(DB_INTR, printk("} "))
1495
1496}
1497
1498static void
1499reset_wd33c93(struct Scsi_Host *instance)
1500{
1501        struct WD33C93_hostdata *hostdata =
1502            (struct WD33C93_hostdata *) instance->hostdata;
1503        const wd33c93_regs regs = hostdata->regs;
1504        uchar sr;
1505
1506#ifdef CONFIG_SGI_IP22
1507        {
1508                int busycount = 0;
1509                extern void sgiwd93_reset(unsigned long);
1510                /* wait 'til the chip gets some time for us */
1511                while ((read_aux_stat(regs) & ASR_BSY) && busycount++ < 100)
1512                        udelay (10);
1513        /*
1514         * there are scsi devices out there, which manage to lock up
1515         * the wd33c93 in a busy condition. In this state it won't
1516         * accept the reset command. The only way to solve this is to
1517         * give the chip a hardware reset (if possible). The code below
1518         * does this for the SGI Indy, where this is possible
1519         */
1520        /* still busy ? */
1521        if (read_aux_stat(regs) & ASR_BSY)
1522                sgiwd93_reset(instance->base); /* yeah, give it the hard one */
1523        }
1524#endif
1525
1526        write_wd33c93(regs, WD_OWN_ID, OWNID_EAF | OWNID_RAF |
1527                      instance->this_id | hostdata->clock_freq);
1528        write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
1529        write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
1530                      calc_sync_xfer(hostdata->default_sx_per / 4,
1531                                     DEFAULT_SX_OFF, 0, hostdata->sx_table));
1532        write_wd33c93(regs, WD_COMMAND, WD_CMD_RESET);
1533
1534
1535#ifdef CONFIG_MVME147_SCSI
1536        udelay(25);             /* The old wd33c93 on MVME147 needs this, at least */
1537#endif
1538
1539        while (!(read_aux_stat(regs) & ASR_INT))
1540                ;
1541        sr = read_wd33c93(regs, WD_SCSI_STATUS);
1542
1543        hostdata->microcode = read_wd33c93(regs, WD_CDB_1);
1544        if (sr == 0x00)
1545                hostdata->chip = C_WD33C93;
1546        else if (sr == 0x01) {
1547                write_wd33c93(regs, WD_QUEUE_TAG, 0xa5);        /* any random number */
1548                sr = read_wd33c93(regs, WD_QUEUE_TAG);
1549                if (sr == 0xa5) {
1550                        hostdata->chip = C_WD33C93B;
1551                        write_wd33c93(regs, WD_QUEUE_TAG, 0);
1552                } else
1553                        hostdata->chip = C_WD33C93A;
1554        } else
1555                hostdata->chip = C_UNKNOWN_CHIP;
1556
1557        if (hostdata->chip != C_WD33C93B)       /* Fast SCSI unavailable */
1558                hostdata->fast = 0;
1559
1560        write_wd33c93(regs, WD_TIMEOUT_PERIOD, TIMEOUT_PERIOD_VALUE);
1561        write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
1562}
1563
1564int
1565wd33c93_host_reset(struct scsi_cmnd * SCpnt)
1566{
1567        struct Scsi_Host *instance;
1568        struct WD33C93_hostdata *hostdata;
1569        int i;
1570
1571        instance = SCpnt->device->host;
1572        spin_lock_irq(instance->host_lock);
1573        hostdata = (struct WD33C93_hostdata *) instance->hostdata;
1574
1575        printk("scsi%d: reset. ", instance->host_no);
1576        disable_irq(instance->irq);
1577
1578        hostdata->dma_stop(instance, NULL, 0);
1579        for (i = 0; i < 8; i++) {
1580                hostdata->busy[i] = 0;
1581                hostdata->sync_xfer[i] =
1582                        calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF,
1583                                        0, hostdata->sx_table);
1584                hostdata->sync_stat[i] = SS_UNSET;      /* using default sync values */
1585        }
1586        hostdata->input_Q = NULL;
1587        hostdata->selecting = NULL;
1588        hostdata->connected = NULL;
1589        hostdata->disconnected_Q = NULL;
1590        hostdata->state = S_UNCONNECTED;
1591        hostdata->dma = D_DMA_OFF;
1592        hostdata->incoming_ptr = 0;
1593        hostdata->outgoing_len = 0;
1594
1595        reset_wd33c93(instance);
1596        SCpnt->result = DID_RESET << 16;
1597        enable_irq(instance->irq);
1598        spin_unlock_irq(instance->host_lock);
1599        return SUCCESS;
1600}
1601
1602int
1603wd33c93_abort(struct scsi_cmnd * cmd)
1604{
1605        struct Scsi_Host *instance;
1606        struct WD33C93_hostdata *hostdata;
1607        wd33c93_regs regs;
1608        struct scsi_cmnd *tmp, *prev;
1609
1610        disable_irq(cmd->device->host->irq);
1611
1612        instance = cmd->device->host;
1613        hostdata = (struct WD33C93_hostdata *) instance->hostdata;
1614        regs = hostdata->regs;
1615
1616/*
1617 * Case 1 : If the command hasn't been issued yet, we simply remove it
1618 *     from the input_Q.
1619 */
1620
1621        tmp = (struct scsi_cmnd *) hostdata->input_Q;
1622        prev = NULL;
1623        while (tmp) {
1624                if (tmp == cmd) {
1625                        if (prev)
1626                                prev->host_scribble = cmd->host_scribble;
1627                        else
1628                                hostdata->input_Q =
1629                                    (struct scsi_cmnd *) cmd->host_scribble;
1630                        cmd->host_scribble = NULL;
1631                        cmd->result = DID_ABORT << 16;
1632                        printk
1633                            ("scsi%d: Abort - removing command from input_Q. ",
1634                             instance->host_no);
1635                        enable_irq(cmd->device->host->irq);
1636                        cmd->scsi_done(cmd);
1637                        return SUCCESS;
1638                }
1639                prev = tmp;
1640                tmp = (struct scsi_cmnd *) tmp->host_scribble;
1641        }
1642
1643/*
1644 * Case 2 : If the command is connected, we're going to fail the abort
1645 *     and let the high level SCSI driver retry at a later time or
1646 *     issue a reset.
1647 *
1648 *     Timeouts, and therefore aborted commands, will be highly unlikely
1649 *     and handling them cleanly in this situation would make the common
1650 *     case of noresets less efficient, and would pollute our code.  So,
1651 *     we fail.
1652 */
1653
1654        if (hostdata->connected == cmd) {
1655                uchar sr, asr;
1656                unsigned long timeout;
1657
1658                printk("scsi%d: Aborting connected command - ",
1659                       instance->host_no);
1660
1661                printk("stopping DMA - ");
1662                if (hostdata->dma == D_DMA_RUNNING) {
1663                        hostdata->dma_stop(instance, cmd, 0);
1664                        hostdata->dma = D_DMA_OFF;
1665                }
1666
1667                printk("sending wd33c93 ABORT command - ");
1668                write_wd33c93(regs, WD_CONTROL,
1669                              CTRL_IDI | CTRL_EDI | CTRL_POLLED);
1670                write_wd33c93_cmd(regs, WD_CMD_ABORT);
1671
1672/* Now we have to attempt to flush out the FIFO... */
1673
1674                printk("flushing fifo - ");
1675                timeout = 1000000;
1676                do {
1677                        asr = read_aux_stat(regs);
1678                        if (asr & ASR_DBR)
1679                                read_wd33c93(regs, WD_DATA);
1680                } while (!(asr & ASR_INT) && timeout-- > 0);
1681                sr = read_wd33c93(regs, WD_SCSI_STATUS);
1682                printk
1683                    ("asr=%02x, sr=%02x, %ld bytes un-transferred (timeout=%ld) - ",
1684                     asr, sr, read_wd33c93_count(regs), timeout);
1685
1686                /*
1687                 * Abort command processed.
1688                 * Still connected.
1689                 * We must disconnect.
1690                 */
1691
1692                printk("sending wd33c93 DISCONNECT command - ");
1693                write_wd33c93_cmd(regs, WD_CMD_DISCONNECT);
1694
1695                timeout = 1000000;
1696                asr = read_aux_stat(regs);
1697                while ((asr & ASR_CIP) && timeout-- > 0)
1698                        asr = read_aux_stat(regs);
1699                sr = read_wd33c93(regs, WD_SCSI_STATUS);
1700                printk("asr=%02x, sr=%02x.", asr, sr);
1701
1702                hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
1703                hostdata->connected = NULL;
1704                hostdata->state = S_UNCONNECTED;
1705                cmd->result = DID_ABORT << 16;
1706
1707/*      sti();*/
1708                wd33c93_execute(instance);
1709
1710                enable_irq(cmd->device->host->irq);
1711                cmd->scsi_done(cmd);
1712                return SUCCESS;
1713        }
1714
1715/*
1716 * Case 3: If the command is currently disconnected from the bus,
1717 * we're not going to expend much effort here: Let's just return
1718 * an ABORT_SNOOZE and hope for the best...
1719 */
1720
1721        tmp = (struct scsi_cmnd *) hostdata->disconnected_Q;
1722        while (tmp) {
1723                if (tmp == cmd) {
1724                        printk
1725                            ("scsi%d: Abort - command found on disconnected_Q - ",
1726                             instance->host_no);
1727                        printk("Abort SNOOZE. ");
1728                        enable_irq(cmd->device->host->irq);
1729                        return FAILED;
1730                }
1731                tmp = (struct scsi_cmnd *) tmp->host_scribble;
1732        }
1733
1734/*
1735 * Case 4 : If we reached this point, the command was not found in any of
1736 *     the queues.
1737 *
1738 * We probably reached this point because of an unlikely race condition
1739 * between the command completing successfully and the abortion code,
1740 * so we won't panic, but we will notify the user in case something really
1741 * broke.
1742 */
1743
1744/*   sti();*/
1745        wd33c93_execute(instance);
1746
1747        enable_irq(cmd->device->host->irq);
1748        printk("scsi%d: warning : SCSI command probably completed successfully"
1749               "         before abortion. ", instance->host_no);
1750        return FAILED;
1751}
1752
1753#define MAX_WD33C93_HOSTS 4
1754#define MAX_SETUP_ARGS ARRAY_SIZE(setup_args)
1755#define SETUP_BUFFER_SIZE 200
1756static char setup_buffer[SETUP_BUFFER_SIZE];
1757static char setup_used[MAX_SETUP_ARGS];
1758static int done_setup = 0;
1759
1760static int
1761wd33c93_setup(char *str)
1762{
1763        int i;
1764        char *p1, *p2;
1765
1766        /* The kernel does some processing of the command-line before calling
1767         * this function: If it begins with any decimal or hex number arguments,
1768         * ints[0] = how many numbers found and ints[1] through [n] are the values
1769         * themselves. str points to where the non-numeric arguments (if any)
1770         * start: We do our own parsing of those. We construct synthetic 'nosync'
1771         * keywords out of numeric args (to maintain compatibility with older
1772         * versions) and then add the rest of the arguments.
1773         */
1774
1775        p1 = setup_buffer;
1776        *p1 = '\0';
1777        if (str)
1778                strncpy(p1, str, SETUP_BUFFER_SIZE - strlen(setup_buffer));
1779        setup_buffer[SETUP_BUFFER_SIZE - 1] = '\0';
1780        p1 = setup_buffer;
1781        i = 0;
1782        while (*p1 && (i < MAX_SETUP_ARGS)) {
1783                p2 = strchr(p1, ',');
1784                if (p2) {
1785                        *p2 = '\0';
1786                        if (p1 != p2)
1787                                setup_args[i] = p1;
1788                        p1 = p2 + 1;
1789                        i++;
1790                } else {
1791                        setup_args[i] = p1;
1792                        break;
1793                }
1794        }
1795        for (i = 0; i < MAX_SETUP_ARGS; i++)
1796                setup_used[i] = 0;
1797        done_setup = 1;
1798
1799        return 1;
1800}
1801__setup("wd33c93=", wd33c93_setup);
1802
1803/* check_setup_args() returns index if key found, 0 if not
1804 */
1805static int
1806check_setup_args(char *key, int *flags, int *val, char *buf)
1807{
1808        int x;
1809        char *cp;
1810
1811        for (x = 0; x < MAX_SETUP_ARGS; x++) {
1812                if (setup_used[x])
1813                        continue;
1814                if (!strncmp(setup_args[x], key, strlen(key)))
1815                        break;
1816                if (!strncmp(setup_args[x], "next", strlen("next")))
1817                        return 0;
1818        }
1819        if (x == MAX_SETUP_ARGS)
1820                return 0;
1821        setup_used[x] = 1;
1822        cp = setup_args[x] + strlen(key);
1823        *val = -1;
1824        if (*cp != ':')
1825                return ++x;
1826        cp++;
1827        if ((*cp >= '0') && (*cp <= '9')) {
1828                *val = simple_strtoul(cp, NULL, 0);
1829        }
1830        return ++x;
1831}
1832
1833/*
1834 * Calculate internal data-transfer-clock cycle from input-clock
1835 * frequency (/MHz) and fill 'sx_table'.
1836 *
1837 * The original driver used to rely on a fixed sx_table, containing periods
1838 * for (only) the lower limits of the respective input-clock-frequency ranges
1839 * (8-10/12-15/16-20 MHz). Although it seems, that no problems occurred with
1840 * this setting so far, it might be desirable to adjust the transfer periods
1841 * closer to the really attached, possibly 25% higher, input-clock, since
1842 * - the wd33c93 may really use a significant shorter period, than it has
1843 *   negotiated (eg. thrashing the target, which expects 4/8MHz, with 5/10MHz
1844 *   instead).
1845 * - the wd33c93 may ask the target for a lower transfer rate, than the target
1846 *   is capable of (eg. negotiating for an assumed minimum of 252ns instead of
1847 *   possible 200ns, which indeed shows up in tests as an approx. 10% lower
1848 *   transfer rate).
1849 */
1850static inline unsigned int
1851round_4(unsigned int x)
1852{
1853        switch (x & 3) {
1854                case 1: --x;
1855                        break;
1856                case 2: ++x;
1857                        fallthrough;
1858                case 3: ++x;
1859        }
1860        return x;
1861}
1862
1863static void
1864calc_sx_table(unsigned int mhz, struct sx_period sx_table[9])
1865{
1866        unsigned int d, i;
1867        if (mhz < 11)
1868                d = 2;  /* divisor for  8-10 MHz input-clock */
1869        else if (mhz < 16)
1870                d = 3;  /* divisor for 12-15 MHz input-clock */
1871        else
1872                d = 4;  /* divisor for 16-20 MHz input-clock */
1873
1874        d = (100000 * d) / 2 / mhz; /* 100 x DTCC / nanosec */
1875
1876        sx_table[0].period_ns = 1;
1877        sx_table[0].reg_value = 0x20;
1878        for (i = 1; i < 8; i++) {
1879                sx_table[i].period_ns = round_4((i+1)*d / 100);
1880                sx_table[i].reg_value = (i+1)*0x10;
1881        }
1882        sx_table[7].reg_value = 0;
1883        sx_table[8].period_ns = 0;
1884        sx_table[8].reg_value = 0;
1885}
1886
1887/*
1888 * check and, maybe, map an init- or "clock:"- argument.
1889 */
1890static uchar
1891set_clk_freq(int freq, int *mhz)
1892{
1893        int x = freq;
1894        if (WD33C93_FS_8_10 == freq)
1895                freq = 8;
1896        else if (WD33C93_FS_12_15 == freq)
1897                freq = 12;
1898        else if (WD33C93_FS_16_20 == freq)
1899                freq = 16;
1900        else if (freq > 7 && freq < 11)
1901                x = WD33C93_FS_8_10;
1902                else if (freq > 11 && freq < 16)
1903                x = WD33C93_FS_12_15;
1904                else if (freq > 15 && freq < 21)
1905                x = WD33C93_FS_16_20;
1906        else {
1907                        /* Hmm, wouldn't it be safer to assume highest freq here? */
1908                x = WD33C93_FS_8_10;
1909                freq = 8;
1910        }
1911        *mhz = freq;
1912        return x;
1913}
1914
1915/*
1916 * to be used with the resync: fast: ... options
1917 */
1918static inline void set_resync ( struct WD33C93_hostdata *hd, int mask )
1919{
1920        int i;
1921        for (i = 0; i < 8; i++)
1922                if (mask & (1 << i))
1923                        hd->sync_stat[i] = SS_UNSET;
1924}
1925
1926void
1927wd33c93_init(struct Scsi_Host *instance, const wd33c93_regs regs,
1928             dma_setup_t setup, dma_stop_t stop, int clock_freq)
1929{
1930        struct WD33C93_hostdata *hostdata;
1931        int i;
1932        int flags;
1933        int val;
1934        char buf[32];
1935
1936        if (!done_setup && setup_strings)
1937                wd33c93_setup(setup_strings);
1938
1939        hostdata = (struct WD33C93_hostdata *) instance->hostdata;
1940
1941        hostdata->regs = regs;
1942        hostdata->clock_freq = set_clk_freq(clock_freq, &i);
1943        calc_sx_table(i, hostdata->sx_table);
1944        hostdata->dma_setup = setup;
1945        hostdata->dma_stop = stop;
1946        hostdata->dma_bounce_buffer = NULL;
1947        hostdata->dma_bounce_len = 0;
1948        for (i = 0; i < 8; i++) {
1949                hostdata->busy[i] = 0;
1950                hostdata->sync_xfer[i] =
1951                        calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF,
1952                                        0, hostdata->sx_table);
1953                hostdata->sync_stat[i] = SS_UNSET;      /* using default sync values */
1954#ifdef PROC_STATISTICS
1955                hostdata->cmd_cnt[i] = 0;
1956                hostdata->disc_allowed_cnt[i] = 0;
1957                hostdata->disc_done_cnt[i] = 0;
1958#endif
1959        }
1960        hostdata->input_Q = NULL;
1961        hostdata->selecting = NULL;
1962        hostdata->connected = NULL;
1963        hostdata->disconnected_Q = NULL;
1964        hostdata->state = S_UNCONNECTED;
1965        hostdata->dma = D_DMA_OFF;
1966        hostdata->level2 = L2_BASIC;
1967        hostdata->disconnect = DIS_ADAPTIVE;
1968        hostdata->args = DEBUG_DEFAULTS;
1969        hostdata->incoming_ptr = 0;
1970        hostdata->outgoing_len = 0;
1971        hostdata->default_sx_per = DEFAULT_SX_PER;
1972        hostdata->no_dma = 0;   /* default is DMA enabled */
1973
1974#ifdef PROC_INTERFACE
1975        hostdata->proc = PR_VERSION | PR_INFO | PR_STATISTICS |
1976            PR_CONNECTED | PR_INPUTQ | PR_DISCQ | PR_STOP;
1977#ifdef PROC_STATISTICS
1978        hostdata->dma_cnt = 0;
1979        hostdata->pio_cnt = 0;
1980        hostdata->int_cnt = 0;
1981#endif
1982#endif
1983
1984        if (check_setup_args("clock", &flags, &val, buf)) {
1985                hostdata->clock_freq = set_clk_freq(val, &val);
1986                calc_sx_table(val, hostdata->sx_table);
1987        }
1988
1989        if (check_setup_args("nosync", &flags, &val, buf))
1990                hostdata->no_sync = val;
1991
1992        if (check_setup_args("nodma", &flags, &val, buf))
1993                hostdata->no_dma = (val == -1) ? 1 : val;
1994
1995        if (check_setup_args("period", &flags, &val, buf))
1996                hostdata->default_sx_per =
1997                    hostdata->sx_table[round_period((unsigned int) val,
1998                                                    hostdata->sx_table)].period_ns;
1999
2000        if (check_setup_args("disconnect", &flags, &val, buf)) {
2001                if ((val >= DIS_NEVER) && (val <= DIS_ALWAYS))
2002                        hostdata->disconnect = val;
2003                else
2004                        hostdata->disconnect = DIS_ADAPTIVE;
2005        }
2006
2007        if (check_setup_args("level2", &flags, &val, buf))
2008                hostdata->level2 = val;
2009
2010        if (check_setup_args("debug", &flags, &val, buf))
2011                hostdata->args = val & DB_MASK;
2012
2013        if (check_setup_args("burst", &flags, &val, buf))
2014                hostdata->dma_mode = val ? CTRL_BURST:CTRL_DMA;
2015
2016        if (WD33C93_FS_16_20 == hostdata->clock_freq /* divisor 4 */
2017                && check_setup_args("fast", &flags, &val, buf))
2018                hostdata->fast = !!val;
2019
2020        if ((i = check_setup_args("next", &flags, &val, buf))) {
2021                while (i)
2022                        setup_used[--i] = 1;
2023        }
2024#ifdef PROC_INTERFACE
2025        if (check_setup_args("proc", &flags, &val, buf))
2026                hostdata->proc = val;
2027#endif
2028
2029        spin_lock_irq(&hostdata->lock);
2030        reset_wd33c93(instance);
2031        spin_unlock_irq(&hostdata->lock);
2032
2033        printk("wd33c93-%d: chip=%s/%d no_sync=0x%x no_dma=%d",
2034               instance->host_no,
2035               (hostdata->chip == C_WD33C93) ? "WD33c93" : (hostdata->chip ==
2036                                                            C_WD33C93A) ?
2037               "WD33c93A" : (hostdata->chip ==
2038                             C_WD33C93B) ? "WD33c93B" : "unknown",
2039               hostdata->microcode, hostdata->no_sync, hostdata->no_dma);
2040#ifdef DEBUGGING_ON
2041        printk(" debug_flags=0x%02x\n", hostdata->args);
2042#else
2043        printk(" debugging=OFF\n");
2044#endif
2045        printk("           setup_args=");
2046        for (i = 0; i < MAX_SETUP_ARGS; i++)
2047                printk("%s,", setup_args[i]);
2048        printk("\n");
2049        printk("           Version %s - %s\n", WD33C93_VERSION, WD33C93_DATE);
2050}
2051
2052int wd33c93_write_info(struct Scsi_Host *instance, char *buf, int len)
2053{
2054#ifdef PROC_INTERFACE
2055        char *bp;
2056        struct WD33C93_hostdata *hd;
2057        int x;
2058
2059        hd = (struct WD33C93_hostdata *) instance->hostdata;
2060
2061/* We accept the following
2062 * keywords (same format as command-line, but arguments are not optional):
2063 *    debug
2064 *    disconnect
2065 *    period
2066 *    resync
2067 *    proc
2068 *    nodma
2069 *    level2
2070 *    burst
2071 *    fast
2072 *    nosync
2073 */
2074
2075        buf[len] = '\0';
2076        for (bp = buf; *bp; ) {
2077                while (',' == *bp || ' ' == *bp)
2078                        ++bp;
2079        if (!strncmp(bp, "debug:", 6)) {
2080                        hd->args = simple_strtoul(bp+6, &bp, 0) & DB_MASK;
2081        } else if (!strncmp(bp, "disconnect:", 11)) {
2082                        x = simple_strtoul(bp+11, &bp, 0);
2083                if (x < DIS_NEVER || x > DIS_ALWAYS)
2084                        x = DIS_ADAPTIVE;
2085                hd->disconnect = x;
2086        } else if (!strncmp(bp, "period:", 7)) {
2087                x = simple_strtoul(bp+7, &bp, 0);
2088                hd->default_sx_per =
2089                        hd->sx_table[round_period((unsigned int) x,
2090                                                  hd->sx_table)].period_ns;
2091        } else if (!strncmp(bp, "resync:", 7)) {
2092                        set_resync(hd, (int)simple_strtoul(bp+7, &bp, 0));
2093        } else if (!strncmp(bp, "proc:", 5)) {
2094                        hd->proc = simple_strtoul(bp+5, &bp, 0);
2095        } else if (!strncmp(bp, "nodma:", 6)) {
2096                        hd->no_dma = simple_strtoul(bp+6, &bp, 0);
2097        } else if (!strncmp(bp, "level2:", 7)) {
2098                        hd->level2 = simple_strtoul(bp+7, &bp, 0);
2099                } else if (!strncmp(bp, "burst:", 6)) {
2100                        hd->dma_mode =
2101                                simple_strtol(bp+6, &bp, 0) ? CTRL_BURST:CTRL_DMA;
2102                } else if (!strncmp(bp, "fast:", 5)) {
2103                        x = !!simple_strtol(bp+5, &bp, 0);
2104                        if (x != hd->fast)
2105                                set_resync(hd, 0xff);
2106                        hd->fast = x;
2107                } else if (!strncmp(bp, "nosync:", 7)) {
2108                        x = simple_strtoul(bp+7, &bp, 0);
2109                        set_resync(hd, x ^ hd->no_sync);
2110                        hd->no_sync = x;
2111                } else {
2112                        break; /* unknown keyword,syntax-error,... */
2113                }
2114        }
2115        return len;
2116#else
2117        return 0;
2118#endif
2119}
2120
2121int
2122wd33c93_show_info(struct seq_file *m, struct Scsi_Host *instance)
2123{
2124#ifdef PROC_INTERFACE
2125        struct WD33C93_hostdata *hd;
2126        struct scsi_cmnd *cmd;
2127        int x;
2128
2129        hd = (struct WD33C93_hostdata *) instance->hostdata;
2130
2131        spin_lock_irq(&hd->lock);
2132        if (hd->proc & PR_VERSION)
2133                seq_printf(m, "\nVersion %s - %s.",
2134                        WD33C93_VERSION, WD33C93_DATE);
2135
2136        if (hd->proc & PR_INFO) {
2137                seq_printf(m, "\nclock_freq=%02x no_sync=%02x no_dma=%d"
2138                        " dma_mode=%02x fast=%d",
2139                        hd->clock_freq, hd->no_sync, hd->no_dma, hd->dma_mode, hd->fast);
2140                seq_puts(m, "\nsync_xfer[] =       ");
2141                for (x = 0; x < 7; x++)
2142                        seq_printf(m, "\t%02x", hd->sync_xfer[x]);
2143                seq_puts(m, "\nsync_stat[] =       ");
2144                for (x = 0; x < 7; x++)
2145                        seq_printf(m, "\t%02x", hd->sync_stat[x]);
2146        }
2147#ifdef PROC_STATISTICS
2148        if (hd->proc & PR_STATISTICS) {
2149                seq_puts(m, "\ncommands issued:    ");
2150                for (x = 0; x < 7; x++)
2151                        seq_printf(m, "\t%ld", hd->cmd_cnt[x]);
2152                seq_puts(m, "\ndisconnects allowed:");
2153                for (x = 0; x < 7; x++)
2154                        seq_printf(m, "\t%ld", hd->disc_allowed_cnt[x]);
2155                seq_puts(m, "\ndisconnects done:   ");
2156                for (x = 0; x < 7; x++)
2157                        seq_printf(m, "\t%ld", hd->disc_done_cnt[x]);
2158                seq_printf(m,
2159                        "\ninterrupts: %ld, DATA_PHASE ints: %ld DMA, %ld PIO",
2160                        hd->int_cnt, hd->dma_cnt, hd->pio_cnt);
2161        }
2162#endif
2163        if (hd->proc & PR_CONNECTED) {
2164                seq_puts(m, "\nconnected:     ");
2165                if (hd->connected) {
2166                        cmd = (struct scsi_cmnd *) hd->connected;
2167                        seq_printf(m, " %d:%llu(%02x)",
2168                                cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
2169                }
2170        }
2171        if (hd->proc & PR_INPUTQ) {
2172                seq_puts(m, "\ninput_Q:       ");
2173                cmd = (struct scsi_cmnd *) hd->input_Q;
2174                while (cmd) {
2175                        seq_printf(m, " %d:%llu(%02x)",
2176                                cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
2177                        cmd = (struct scsi_cmnd *) cmd->host_scribble;
2178                }
2179        }
2180        if (hd->proc & PR_DISCQ) {
2181                seq_puts(m, "\ndisconnected_Q:");
2182                cmd = (struct scsi_cmnd *) hd->disconnected_Q;
2183                while (cmd) {
2184                        seq_printf(m, " %d:%llu(%02x)",
2185                                cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
2186                        cmd = (struct scsi_cmnd *) cmd->host_scribble;
2187                }
2188        }
2189        seq_putc(m, '\n');
2190        spin_unlock_irq(&hd->lock);
2191#endif                          /* PROC_INTERFACE */
2192        return 0;
2193}
2194
2195EXPORT_SYMBOL(wd33c93_host_reset);
2196EXPORT_SYMBOL(wd33c93_init);
2197EXPORT_SYMBOL(wd33c93_abort);
2198EXPORT_SYMBOL(wd33c93_queuecommand);
2199EXPORT_SYMBOL(wd33c93_intr);
2200EXPORT_SYMBOL(wd33c93_show_info);
2201EXPORT_SYMBOL(wd33c93_write_info);
2202