git.oblomov.eu Git - linux-2.6/blob - drivers/scsi/ide-scsi.c

   1 /*
   2  * Copyright (C) 1996-1999  Gadi Oxman <gadio@netvision.net.il>
   3  * Copyright (C) 2004-2005  Bartlomiej Zolnierkiewicz
   4  */
   5
   6 /*
   7  * Emulation of a SCSI host adapter for IDE ATAPI devices.
   8  *
   9  * With this driver, one can use the Linux SCSI drivers instead of the
  10  * native IDE ATAPI drivers.
  11  *
  12  * Ver 0.1   Dec  3 96   Initial version.
  13  * Ver 0.2   Jan 26 97   Fixed bug in cleanup_module() and added emulation
  14  *                        of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
  15  *                        to Janos Farkas for pointing this out.
  16  *                       Avoid using bitfields in structures for m68k.
  17  *                       Added Scatter/Gather and DMA support.
  18  * Ver 0.4   Dec  7 97   Add support for ATAPI PD/CD drives.
  19  *                       Use variable timeout for each command.
  20  * Ver 0.5   Jan  2 98   Fix previous PD/CD support.
  21  *                       Allow disabling of SCSI-6 to SCSI-10 transformation.
  22  * Ver 0.6   Jan 27 98   Allow disabling of SCSI command translation layer
  23  *                        for access through /dev/sg.
  24  *                       Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
  25  * Ver 0.7   Dec 04 98   Ignore commands where lun != 0 to avoid multiple
  26  *                        detection of devices with CONFIG_SCSI_MULTI_LUN
  27  * Ver 0.8   Feb 05 99   Optical media need translation too. Reverse 0.7.
  28  * Ver 0.9   Jul 04 99   Fix a bug in SG_SET_TRANSFORM.
  29  * Ver 0.91  Jun 10 02   Fix "off by one" error in transforms
  30  * Ver 0.92  Dec 31 02   Implement new SCSI mid level API
  31  */
  32
  33 #define IDESCSI_VERSION "0.92"
  34
  35 #include <linux/module.h>
  36 #include <linux/types.h>
  37 #include <linux/string.h>
  38 #include <linux/kernel.h>
  39 #include <linux/mm.h>
  40 #include <linux/ioport.h>
  41 #include <linux/blkdev.h>
  42 #include <linux/errno.h>
  43 #include <linux/hdreg.h>
  44 #include <linux/slab.h>
  45 #include <linux/ide.h>
  46 #include <linux/scatterlist.h>
  47 #include <linux/delay.h>
  48 #include <linux/mutex.h>
  49 #include <linux/bitops.h>
  50
  51 #include <asm/io.h>
  52 #include <asm/uaccess.h>
  53
  54 #include <scsi/scsi.h>
  55 #include <scsi/scsi_cmnd.h>
  56 #include <scsi/scsi_device.h>
  57 #include <scsi/scsi_host.h>
  58 #include <scsi/scsi_tcq.h>
  59 #include <scsi/sg.h>
  60
  61 #define IDESCSI_DEBUG_LOG               0
  62
  63 /*
  64  *      SCSI command transformation layer
  65  */
  66 #define IDESCSI_SG_TRANSFORM            1       /* /dev/sg transformation */
  67
  68 /*
  69  *      Log flags
  70  */
  71 #define IDESCSI_LOG_CMD                 0       /* Log SCSI commands */
  72
  73 typedef struct ide_scsi_obj {
  74         ide_drive_t             *drive;
  75         ide_driver_t            *driver;
  76         struct gendisk          *disk;
  77         struct Scsi_Host        *host;
  78
  79         struct ide_atapi_pc *pc;                /* Current packet command */
  80         unsigned long flags;                    /* Status/Action flags */
  81         unsigned long transform;                /* SCSI cmd translation layer */
  82         unsigned long log;                      /* log flags */
  83 } idescsi_scsi_t;
  84
  85 static DEFINE_MUTEX(idescsi_ref_mutex);
  86 /* Set by module param to skip cd */
  87 static int idescsi_nocd;
  88
  89 #define ide_scsi_g(disk) \
  90         container_of((disk)->private_data, struct ide_scsi_obj, driver)
  91
  92 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
  93 {
  94         struct ide_scsi_obj *scsi = NULL;
  95
  96         mutex_lock(&idescsi_ref_mutex);
  97         scsi = ide_scsi_g(disk);
  98         if (scsi)
  99                 scsi_host_get(scsi->host);
 100         mutex_unlock(&idescsi_ref_mutex);
 101         return scsi;
 102 }
 103
 104 static void ide_scsi_put(struct ide_scsi_obj *scsi)
 105 {
 106         mutex_lock(&idescsi_ref_mutex);
 107         scsi_host_put(scsi->host);
 108         mutex_unlock(&idescsi_ref_mutex);
 109 }
 110
 111 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
 112 {
 113         return (idescsi_scsi_t*) (&host[1]);
 114 }
 115
 116 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
 117 {
 118         return scsihost_to_idescsi(ide_drive->driver_data);
 119 }
 120
 121 /*
 122  *      Per ATAPI device status bits.
 123  */
 124 #define IDESCSI_DRQ_INTERRUPT           0       /* DRQ interrupt device */
 125
 126 /*
 127  *      ide-scsi requests.
 128  */
 129 #define IDESCSI_PC_RQ                   90
 130
 131 /*
 132  *      PIO data transfer routines using the scatter gather table.
 133  */
 134 static void idescsi_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
 135                 unsigned int bcount)
 136 {
 137         int count;
 138         char *buf;
 139
 140         while (bcount) {
 141                 count = min(pc->sg->length - pc->b_count, bcount);
 142                 if (PageHighMem(sg_page(pc->sg))) {
 143                         unsigned long flags;
 144
 145                         local_irq_save(flags);
 146                         buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
 147                                         pc->sg->offset;
 148                         drive->hwif->atapi_input_bytes(drive,
 149                                                 buf + pc->b_count, count);
 150                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
 151                         local_irq_restore(flags);
 152                 } else {
 153                         buf = sg_virt(pc->sg);
 154                         drive->hwif->atapi_input_bytes(drive,
 155                                                 buf + pc->b_count, count);
 156                 }
 157                 bcount -= count; pc->b_count += count;
 158                 if (pc->b_count == pc->sg->length) {
 159                         if (!--pc->sg_cnt)
 160                                 break;
 161                         pc->sg = sg_next(pc->sg);
 162                         pc->b_count = 0;
 163                 }
 164         }
 165
 166         if (bcount) {
 167                 printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
 168                 ide_atapi_discard_data(drive, bcount);
 169         }
 170 }
 171
 172 static void idescsi_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
 173                 unsigned int bcount)
 174 {
 175         int count;
 176         char *buf;
 177
 178         while (bcount) {
 179                 count = min(pc->sg->length - pc->b_count, bcount);
 180                 if (PageHighMem(sg_page(pc->sg))) {
 181                         unsigned long flags;
 182
 183                         local_irq_save(flags);
 184                         buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
 185                                                 pc->sg->offset;
 186                         drive->hwif->atapi_output_bytes(drive,
 187                                                 buf + pc->b_count, count);
 188                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
 189                         local_irq_restore(flags);
 190                 } else {
 191                         buf = sg_virt(pc->sg);
 192                         drive->hwif->atapi_output_bytes(drive,
 193                                                 buf + pc->b_count, count);
 194                 }
 195                 bcount -= count; pc->b_count += count;
 196                 if (pc->b_count == pc->sg->length) {
 197                         if (!--pc->sg_cnt)
 198                                 break;
 199                         pc->sg = sg_next(pc->sg);
 200                         pc->b_count = 0;
 201                 }
 202         }
 203
 204         if (bcount) {
 205                 printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
 206                 ide_atapi_write_zeros(drive, bcount);
 207         }
 208 }
 209
 210 static void ide_scsi_hex_dump(u8 *data, int len)
 211 {
 212         print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
 213 }
 214
 215 static int idescsi_check_condition(ide_drive_t *drive,
 216                 struct request *failed_cmd)
 217 {
 218         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 219         struct ide_atapi_pc   *pc;
 220         struct request *rq;
 221         u8             *buf;
 222
 223         /* stuff a sense request in front of our current request */
 224         pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
 225         rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
 226         buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
 227         if (!pc || !rq || !buf) {
 228                 kfree(buf);
 229                 kfree(rq);
 230                 kfree(pc);
 231                 return -ENOMEM;
 232         }
 233         ide_init_drive_cmd(rq);
 234         rq->special = (char *) pc;
 235         pc->rq = rq;
 236         pc->buf = buf;
 237         pc->c[0] = REQUEST_SENSE;
 238         pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
 239         rq->cmd_type = REQ_TYPE_SENSE;
 240         pc->timeout = jiffies + WAIT_READY;
 241         /* NOTE! Save the failed packet command in "rq->buffer" */
 242         rq->buffer = (void *) failed_cmd->special;
 243         pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
 244         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 245                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
 246                 ide_scsi_hex_dump(pc->c, 6);
 247         }
 248         rq->rq_disk = scsi->disk;
 249         return ide_do_drive_cmd(drive, rq, ide_preempt);
 250 }
 251
 252 static int idescsi_end_request(ide_drive_t *, int, int);
 253
 254 static ide_startstop_t
 255 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
 256 {
 257         ide_hwif_t *hwif = drive->hwif;
 258
 259         if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT))
 260                 /* force an abort */
 261                 hwif->OUTB(WIN_IDLEIMMEDIATE,
 262                            hwif->io_ports[IDE_COMMAND_OFFSET]);
 263
 264         rq->errors++;
 265
 266         idescsi_end_request(drive, 0, 0);
 267
 268         return ide_stopped;
 269 }
 270
 271 static ide_startstop_t
 272 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
 273 {
 274 #if IDESCSI_DEBUG_LOG
 275         printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
 276                 ((struct ide_atapi_pc *) rq->special)->scsi_cmd->serial_number);
 277 #endif
 278         rq->errors |= ERROR_MAX;
 279
 280         idescsi_end_request(drive, 0, 0);
 281
 282         return ide_stopped;
 283 }
 284
 285 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
 286 {
 287         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 288         struct request *rq = HWGROUP(drive)->rq;
 289         struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
 290         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
 291         struct Scsi_Host *host;
 292         int errors = rq->errors;
 293         unsigned long flags;
 294
 295         if (!blk_special_request(rq) && !blk_sense_request(rq)) {
 296                 ide_end_request(drive, uptodate, nrsecs);
 297                 return 0;
 298         }
 299         ide_end_drive_cmd (drive, 0, 0);
 300         if (blk_sense_request(rq)) {
 301                 struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
 302                 if (log) {
 303                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
 304                         ide_scsi_hex_dump(pc->buf, 16);
 305                 }
 306                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
 307                         SCSI_SENSE_BUFFERSIZE);
 308                 kfree(pc->buf);
 309                 kfree(pc);
 310                 kfree(rq);
 311                 pc = opc;
 312                 rq = pc->rq;
 313                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
 314                                 (((pc->flags & PC_FLAG_TIMEDOUT) ?
 315                                   DID_TIME_OUT :
 316                                   DID_OK) << 16);
 317         } else if (pc->flags & PC_FLAG_TIMEDOUT) {
 318                 if (log)
 319                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
 320                                         drive->name, pc->scsi_cmd->serial_number);
 321                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
 322         } else if (errors >= ERROR_MAX) {
 323                 pc->scsi_cmd->result = DID_ERROR << 16;
 324                 if (log)
 325                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 326         } else if (errors) {
 327                 if (log)
 328                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 329                 if (!idescsi_check_condition(drive, rq))
 330                         /* we started a request sense, so we'll be back, exit for now */
 331                         return 0;
 332                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
 333         } else {
 334                 pc->scsi_cmd->result = DID_OK << 16;
 335         }
 336         host = pc->scsi_cmd->device->host;
 337         spin_lock_irqsave(host->host_lock, flags);
 338         pc->done(pc->scsi_cmd);
 339         spin_unlock_irqrestore(host->host_lock, flags);
 340         kfree(pc);
 341         kfree(rq);
 342         scsi->pc = NULL;
 343         return 0;
 344 }
 345
 346 static inline unsigned long get_timeout(struct ide_atapi_pc *pc)
 347 {
 348         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
 349 }
 350
 351 static int idescsi_expiry(ide_drive_t *drive)
 352 {
 353         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 354         struct ide_atapi_pc   *pc   = scsi->pc;
 355
 356 #if IDESCSI_DEBUG_LOG
 357         printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
 358 #endif
 359         pc->flags |= PC_FLAG_TIMEDOUT;
 360
 361         return 0;                                       /* we do not want the ide subsystem to retry */
 362 }
 363
 364 /*
 365  *      Our interrupt handler.
 366  */
 367 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
 368 {
 369         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 370         ide_hwif_t *hwif = drive->hwif;
 371         struct ide_atapi_pc *pc = scsi->pc;
 372         struct request *rq = pc->rq;
 373         unsigned int temp;
 374         u16 bcount;
 375         u8 stat, ireason;
 376
 377 #if IDESCSI_DEBUG_LOG
 378         printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
 379 #endif /* IDESCSI_DEBUG_LOG */
 380
 381         if (pc->flags & PC_FLAG_TIMEDOUT) {
 382 #if IDESCSI_DEBUG_LOG
 383                 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet  %lu at %lu\n",
 384                                 pc->scsi_cmd->serial_number, jiffies);
 385 #endif
 386                 /* end this request now - scsi should retry it*/
 387                 idescsi_end_request (drive, 1, 0);
 388                 return ide_stopped;
 389         }
 390         if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
 391                 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 392 #if IDESCSI_DEBUG_LOG
 393                 printk ("ide-scsi: %s: DMA complete\n", drive->name);
 394 #endif /* IDESCSI_DEBUG_LOG */
 395                 pc->xferred = pc->req_xfer;
 396                 (void)hwif->dma_ops->dma_end(drive);
 397         }
 398
 399         /* Clear the interrupt */
 400         stat = ide_read_status(drive);
 401
 402         if ((stat & DRQ_STAT) == 0) {
 403                 /* No more interrupts */
 404                 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 405                         printk(KERN_INFO "Packet command completed, %d bytes"
 406                                         " transferred\n", pc->xferred);
 407                 local_irq_enable_in_hardirq();
 408                 if (stat & ERR_STAT)
 409                         rq->errors++;
 410                 idescsi_end_request (drive, 1, 0);
 411                 return ide_stopped;
 412         }
 413         bcount = (hwif->INB(hwif->io_ports[IDE_BCOUNTH_OFFSET]) << 8) |
 414                   hwif->INB(hwif->io_ports[IDE_BCOUNTL_OFFSET]);
 415         ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
 416
 417         if (ireason & CD) {
 418                 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
 419                 return ide_do_reset (drive);
 420         }
 421         if (ireason & IO) {
 422                 temp = pc->xferred + bcount;
 423                 if (temp > pc->req_xfer) {
 424                         if (temp > pc->buf_size) {
 425                                 printk(KERN_ERR "ide-scsi: The scsi wants to "
 426                                         "send us more data than expected "
 427                                         "- discarding data\n");
 428                                 temp = pc->buf_size - pc->xferred;
 429                                 if (temp) {
 430                                         pc->flags &= ~PC_FLAG_WRITING;
 431                                         if (pc->sg)
 432                                                 idescsi_input_buffers(drive, pc,
 433                                                                         temp);
 434                                         else
 435                                                 drive->hwif->atapi_input_bytes(drive, pc->cur_pos, temp);
 436                                         printk(KERN_ERR "ide-scsi: transferred"
 437                                                         " %d of %d bytes\n",
 438                                                         temp, bcount);
 439                                 }
 440                                 pc->xferred += temp;
 441                                 pc->cur_pos += temp;
 442                                 ide_atapi_discard_data(drive, bcount - temp);
 443                                 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 444                                 return ide_started;
 445                         }
 446 #if IDESCSI_DEBUG_LOG
 447                         printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
 448 #endif /* IDESCSI_DEBUG_LOG */
 449                 }
 450         }
 451         if (ireason & IO) {
 452                 pc->flags &= ~PC_FLAG_WRITING;
 453                 if (pc->sg)
 454                         idescsi_input_buffers(drive, pc, bcount);
 455                 else
 456                         hwif->atapi_input_bytes(drive, pc->cur_pos,
 457                                                 bcount);
 458         } else {
 459                 pc->flags |= PC_FLAG_WRITING;
 460                 if (pc->sg)
 461                         idescsi_output_buffers(drive, pc, bcount);
 462                 else
 463                         hwif->atapi_output_bytes(drive, pc->cur_pos,
 464                                                  bcount);
 465         }
 466         /* Update the current position */
 467         pc->xferred += bcount;
 468         pc->cur_pos += bcount;
 469
 470         /* And set the interrupt handler again */
 471         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 472         return ide_started;
 473 }
 474
 475 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
 476 {
 477         ide_hwif_t *hwif = drive->hwif;
 478         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 479         struct ide_atapi_pc *pc = scsi->pc;
 480         ide_startstop_t startstop;
 481         u8 ireason;
 482
 483         if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
 484                 printk(KERN_ERR "ide-scsi: Strange, packet command "
 485                         "initiated yet DRQ isn't asserted\n");
 486                 return startstop;
 487         }
 488         ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
 489         if ((ireason & CD) == 0 || (ireason & IO)) {
 490                 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
 491                                 "issuing a packet command\n");
 492                 return ide_do_reset (drive);
 493         }
 494         BUG_ON(HWGROUP(drive)->handler != NULL);
 495         /* Set the interrupt routine */
 496         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 497         /* Send the actual packet */
 498         drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
 499         if (pc->flags & PC_FLAG_DMA_OK) {
 500                 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
 501                 hwif->dma_ops->dma_start(drive);
 502         }
 503         return ide_started;
 504 }
 505
 506 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
 507 {
 508         switch (pc->c[0]) {
 509                 case READ_6: case READ_10: case READ_12:
 510                         pc->flags &= ~PC_FLAG_WRITING;
 511                         return 0;
 512                 case WRITE_6: case WRITE_10: case WRITE_12:
 513                         pc->flags |= PC_FLAG_WRITING;
 514                         return 0;
 515                 default:
 516                         return 1;
 517         }
 518 }
 519
 520 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
 521 {
 522         ide_hwif_t *hwif = drive->hwif;
 523         struct scatterlist *sg, *scsi_sg;
 524         int segments;
 525
 526         if (!pc->req_xfer || pc->req_xfer % 1024)
 527                 return 1;
 528
 529         if (idescsi_set_direction(pc))
 530                 return 1;
 531
 532         sg = hwif->sg_table;
 533         scsi_sg = scsi_sglist(pc->scsi_cmd);
 534         segments = scsi_sg_count(pc->scsi_cmd);
 535
 536         if (segments > hwif->sg_max_nents)
 537                 return 1;
 538
 539         hwif->sg_nents = segments;
 540         memcpy(sg, scsi_sg, sizeof(*sg) * segments);
 541
 542         return 0;
 543 }
 544
 545 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
 546                 struct ide_atapi_pc *pc)
 547 {
 548         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 549         ide_hwif_t *hwif = drive->hwif;
 550         u16 bcount;
 551         u8 dma = 0;
 552
 553         /* Set the current packet command */
 554         scsi->pc = pc;
 555         /* We haven't transferred any data yet */
 556         pc->xferred = 0;
 557         pc->cur_pos = pc->buf;
 558         /* Request to transfer the entire buffer at once */
 559         bcount = min(pc->req_xfer, 63 * 1024);
 560
 561         if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
 562                 hwif->sg_mapped = 1;
 563                 dma = !hwif->dma_ops->dma_setup(drive);
 564                 hwif->sg_mapped = 0;
 565         }
 566
 567         ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK, bcount, dma);
 568
 569         if (dma)
 570                 pc->flags |= PC_FLAG_DMA_OK;
 571
 572         if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
 573                 ide_execute_command(drive, WIN_PACKETCMD, &idescsi_transfer_pc,
 574                                     get_timeout(pc), idescsi_expiry);
 575                 return ide_started;
 576         } else {
 577                 /* Issue the packet command */
 578                 hwif->OUTB(WIN_PACKETCMD, hwif->io_ports[IDE_COMMAND_OFFSET]);
 579                 return idescsi_transfer_pc(drive);
 580         }
 581 }
 582
 583 /*
 584  *      idescsi_do_request is our request handling function.
 585  */
 586 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
 587 {
 588 #if IDESCSI_DEBUG_LOG
 589         printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
 590         printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
 591 #endif /* IDESCSI_DEBUG_LOG */
 592
 593         if (blk_sense_request(rq) || blk_special_request(rq)) {
 594                 return idescsi_issue_pc(drive,
 595                                 (struct ide_atapi_pc *) rq->special);
 596         }
 597         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
 598         idescsi_end_request (drive, 0, 0);
 599         return ide_stopped;
 600 }
 601
 602 #ifdef CONFIG_IDE_PROC_FS
 603 static void idescsi_add_settings(ide_drive_t *drive)
 604 {
 605         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 606
 607 /*
 608  *                      drive   setting name    read/write      data type       min     max     mul_factor      div_factor      data pointer            set function
 609  */
 610         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
 611         ide_add_setting(drive,  "bios_head",    SETTING_RW,     TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
 612         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
 613         ide_add_setting(drive,  "transform",    SETTING_RW,     TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
 614         ide_add_setting(drive,  "log",          SETTING_RW,     TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
 615 }
 616 #else
 617 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
 618 #endif
 619
 620 /*
 621  *      Driver initialization.
 622  */
 623 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 624 {
 625         if (drive->id && (drive->id->config & 0x0060) == 0x20)
 626                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
 627         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 628 #if IDESCSI_DEBUG_LOG
 629         set_bit(IDESCSI_LOG_CMD, &scsi->log);
 630 #endif /* IDESCSI_DEBUG_LOG */
 631         idescsi_add_settings(drive);
 632 }
 633
 634 static void ide_scsi_remove(ide_drive_t *drive)
 635 {
 636         struct Scsi_Host *scsihost = drive->driver_data;
 637         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
 638         struct gendisk *g = scsi->disk;
 639
 640         scsi_remove_host(scsihost);
 641         ide_proc_unregister_driver(drive, scsi->driver);
 642
 643         ide_unregister_region(g);
 644
 645         drive->driver_data = NULL;
 646         g->private_data = NULL;
 647         put_disk(g);
 648
 649         ide_scsi_put(scsi);
 650 }
 651
 652 static int ide_scsi_probe(ide_drive_t *);
 653
 654 #ifdef CONFIG_IDE_PROC_FS
 655 static ide_proc_entry_t idescsi_proc[] = {
 656         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
 657         { NULL, 0, NULL, NULL }
 658 };
 659 #endif
 660
 661 static ide_driver_t idescsi_driver = {
 662         .gen_driver = {
 663                 .owner          = THIS_MODULE,
 664                 .name           = "ide-scsi",
 665                 .bus            = &ide_bus_type,
 666         },
 667         .probe                  = ide_scsi_probe,
 668         .remove                 = ide_scsi_remove,
 669         .version                = IDESCSI_VERSION,
 670         .media                  = ide_scsi,
 671         .supports_dsc_overlap   = 0,
 672         .do_request             = idescsi_do_request,
 673         .end_request            = idescsi_end_request,
 674         .error                  = idescsi_atapi_error,
 675         .abort                  = idescsi_atapi_abort,
 676 #ifdef CONFIG_IDE_PROC_FS
 677         .proc                   = idescsi_proc,
 678 #endif
 679 };
 680
 681 static int idescsi_ide_open(struct inode *inode, struct file *filp)
 682 {
 683         struct gendisk *disk = inode->i_bdev->bd_disk;
 684         struct ide_scsi_obj *scsi;
 685
 686         if (!(scsi = ide_scsi_get(disk)))
 687                 return -ENXIO;
 688
 689         return 0;
 690 }
 691
 692 static int idescsi_ide_release(struct inode *inode, struct file *filp)
 693 {
 694         struct gendisk *disk = inode->i_bdev->bd_disk;
 695         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
 696
 697         ide_scsi_put(scsi);
 698
 699         return 0;
 700 }
 701
 702 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
 703                         unsigned int cmd, unsigned long arg)
 704 {
 705         struct block_device *bdev = inode->i_bdev;
 706         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
 707         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
 708 }
 709
 710 static struct block_device_operations idescsi_ops = {
 711         .owner          = THIS_MODULE,
 712         .open           = idescsi_ide_open,
 713         .release        = idescsi_ide_release,
 714         .ioctl          = idescsi_ide_ioctl,
 715 };
 716
 717 static int idescsi_slave_configure(struct scsi_device * sdp)
 718 {
 719         /* Configure detected device */
 720         sdp->use_10_for_rw = 1;
 721         sdp->use_10_for_ms = 1;
 722         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
 723         return 0;
 724 }
 725
 726 static const char *idescsi_info (struct Scsi_Host *host)
 727 {
 728         return "SCSI host adapter emulation for IDE ATAPI devices";
 729 }
 730
 731 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
 732 {
 733         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
 734
 735         if (cmd == SG_SET_TRANSFORM) {
 736                 if (arg)
 737                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 738                 else
 739                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 740                 return 0;
 741         } else if (cmd == SG_GET_TRANSFORM)
 742                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
 743         return -EINVAL;
 744 }
 745
 746 static int idescsi_queue (struct scsi_cmnd *cmd,
 747                 void (*done)(struct scsi_cmnd *))
 748 {
 749         struct Scsi_Host *host = cmd->device->host;
 750         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
 751         ide_drive_t *drive = scsi->drive;
 752         struct request *rq = NULL;
 753         struct ide_atapi_pc *pc = NULL;
 754
 755         if (!drive) {
 756                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
 757                 goto abort;
 758         }
 759         scsi = drive_to_idescsi(drive);
 760         pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
 761         rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
 762         if (rq == NULL || pc == NULL) {
 763                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
 764                 goto abort;
 765         }
 766
 767         memset (pc->c, 0, 12);
 768         pc->flags = 0;
 769         pc->rq = rq;
 770         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
 771         pc->buf = NULL;
 772         pc->sg = scsi_sglist(cmd);
 773         pc->sg_cnt = scsi_sg_count(cmd);
 774         pc->b_count = 0;
 775         pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
 776         pc->scsi_cmd = cmd;
 777         pc->done = done;
 778         pc->timeout = jiffies + cmd->timeout_per_command;
 779
 780         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 781                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
 782                 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
 783                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
 784                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
 785                         ide_scsi_hex_dump(pc->c, 12);
 786                 }
 787         }
 788
 789         ide_init_drive_cmd (rq);
 790         rq->special = (char *) pc;
 791         rq->cmd_type = REQ_TYPE_SPECIAL;
 792         spin_unlock_irq(host->host_lock);
 793         rq->rq_disk = scsi->disk;
 794         (void) ide_do_drive_cmd (drive, rq, ide_end);
 795         spin_lock_irq(host->host_lock);
 796         return 0;
 797 abort:
 798         kfree (pc);
 799         kfree (rq);
 800         cmd->result = DID_ERROR << 16;
 801         done(cmd);
 802         return 0;
 803 }
 804
 805 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
 806 {
 807         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 808         ide_drive_t    *drive = scsi->drive;
 809         int             busy;
 810         int             ret   = FAILED;
 811
 812         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
 813
 814         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 815                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
 816
 817         if (!drive) {
 818                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
 819                 WARN_ON(1);
 820                 goto no_drive;
 821         }
 822
 823         /* First give it some more time, how much is "right" is hard to say :-( */
 824
 825         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
 826         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 827                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
 828
 829         spin_lock_irq(&ide_lock);
 830
 831         /* If there is no pc running we're done (our interrupt took care of it) */
 832         if (!scsi->pc) {
 833                 ret = SUCCESS;
 834                 goto ide_unlock;
 835         }
 836
 837         /* It's somewhere in flight. Does ide subsystem agree? */
 838         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
 839             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
 840                 /*
 841                  * FIXME - not sure this condition can ever occur
 842                  */
 843                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
 844
 845                 if (blk_sense_request(scsi->pc->rq))
 846                         kfree(scsi->pc->buf);
 847                 kfree(scsi->pc->rq);
 848                 kfree(scsi->pc);
 849                 scsi->pc = NULL;
 850
 851                 ret = SUCCESS;
 852         }
 853
 854 ide_unlock:
 855         spin_unlock_irq(&ide_lock);
 856 no_drive:
 857         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 858                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
 859
 860         return ret;
 861 }
 862
 863 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
 864 {
 865         struct request *req;
 866         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 867         ide_drive_t    *drive = scsi->drive;
 868         int             ready = 0;
 869         int             ret   = SUCCESS;
 870
 871         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
 872
 873         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 874                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
 875
 876         if (!drive) {
 877                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
 878                 WARN_ON(1);
 879                 return FAILED;
 880         }
 881
 882         spin_lock_irq(cmd->device->host->host_lock);
 883         spin_lock(&ide_lock);
 884
 885         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
 886                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
 887                 spin_unlock(&ide_lock);
 888                 spin_unlock_irq(cmd->device->host->host_lock);
 889                 return FAILED;
 890         }
 891
 892         /* kill current request */
 893         if (__blk_end_request(req, -EIO, 0))
 894                 BUG();
 895         if (blk_sense_request(req))
 896                 kfree(scsi->pc->buf);
 897         kfree(scsi->pc);
 898         scsi->pc = NULL;
 899         kfree(req);
 900
 901         /* now nuke the drive queue */
 902         while ((req = elv_next_request(drive->queue))) {
 903                 if (__blk_end_request(req, -EIO, 0))
 904                         BUG();
 905         }
 906
 907         HWGROUP(drive)->rq = NULL;
 908         HWGROUP(drive)->handler = NULL;
 909         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
 910         spin_unlock(&ide_lock);
 911
 912         ide_do_reset(drive);
 913
 914         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
 915
 916         do {
 917                 spin_unlock_irq(cmd->device->host->host_lock);
 918                 msleep(50);
 919                 spin_lock_irq(cmd->device->host->host_lock);
 920         } while ( HWGROUP(drive)->handler );
 921
 922         ready = drive_is_ready(drive);
 923         HWGROUP(drive)->busy--;
 924         if (!ready) {
 925                 printk (KERN_ERR "ide-scsi: reset failed!\n");
 926                 ret = FAILED;
 927         }
 928
 929         spin_unlock_irq(cmd->device->host->host_lock);
 930         return ret;
 931 }
 932
 933 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
 934                 sector_t capacity, int *parm)
 935 {
 936         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
 937         ide_drive_t *drive = idescsi->drive;
 938
 939         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
 940                 parm[0] = drive->bios_head;
 941                 parm[1] = drive->bios_sect;
 942                 parm[2] = drive->bios_cyl;
 943         }
 944         return 0;
 945 }
 946
 947 static struct scsi_host_template idescsi_template = {
 948         .module                 = THIS_MODULE,
 949         .name                   = "idescsi",
 950         .info                   = idescsi_info,
 951         .slave_configure        = idescsi_slave_configure,
 952         .ioctl                  = idescsi_ioctl,
 953         .queuecommand           = idescsi_queue,
 954         .eh_abort_handler       = idescsi_eh_abort,
 955         .eh_host_reset_handler  = idescsi_eh_reset,
 956         .bios_param             = idescsi_bios,
 957         .can_queue              = 40,
 958         .this_id                = -1,
 959         .sg_tablesize           = 256,
 960         .cmd_per_lun            = 5,
 961         .max_sectors            = 128,
 962         .use_clustering         = DISABLE_CLUSTERING,
 963         .emulated               = 1,
 964         .proc_name              = "ide-scsi",
 965 };
 966
 967 static int ide_scsi_probe(ide_drive_t *drive)
 968 {
 969         idescsi_scsi_t *idescsi;
 970         struct Scsi_Host *host;
 971         struct gendisk *g;
 972         static int warned;
 973         int err = -ENOMEM;
 974
 975         if (!warned && drive->media == ide_cdrom) {
 976                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
 977                 warned = 1;
 978         }
 979
 980         if (idescsi_nocd && drive->media == ide_cdrom)
 981                 return -ENODEV;
 982
 983         if (!strstr("ide-scsi", drive->driver_req) ||
 984             !drive->present ||
 985             drive->media == ide_disk ||
 986             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
 987                 return -ENODEV;
 988
 989         g = alloc_disk(1 << PARTN_BITS);
 990         if (!g)
 991                 goto out_host_put;
 992
 993         ide_init_disk(g, drive);
 994
 995         host->max_id = 1;
 996
 997 #if IDESCSI_DEBUG_LOG
 998         if (drive->id->last_lun)
 999                 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1000 #endif
1001         if ((drive->id->last_lun & 0x7) != 7)
1002                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1003         else
1004                 host->max_lun = 1;
1005
1006         drive->driver_data = host;
1007         idescsi = scsihost_to_idescsi(host);
1008         idescsi->drive = drive;
1009         idescsi->driver = &idescsi_driver;
1010         idescsi->host = host;
1011         idescsi->disk = g;
1012         g->private_data = &idescsi->driver;
1013         ide_proc_register_driver(drive, &idescsi_driver);
1014         err = 0;
1015         idescsi_setup(drive, idescsi);
1016         g->fops = &idescsi_ops;
1017         ide_register_region(g);
1018         err = scsi_add_host(host, &drive->gendev);
1019         if (!err) {
1020                 scsi_scan_host(host);
1021                 return 0;
1022         }
1023         /* fall through on error */
1024         ide_unregister_region(g);
1025         ide_proc_unregister_driver(drive, &idescsi_driver);
1026
1027         put_disk(g);
1028 out_host_put:
1029         scsi_host_put(host);
1030         return err;
1031 }
1032
1033 static int __init init_idescsi_module(void)
1034 {
1035         return driver_register(&idescsi_driver.gen_driver);
1036 }
1037
1038 static void __exit exit_idescsi_module(void)
1039 {
1040         driver_unregister(&idescsi_driver.gen_driver);
1041 }
1042
1043 module_param(idescsi_nocd, int, 0600);
1044 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1045 module_init(init_idescsi_module);
1046 module_exit(exit_idescsi_module);
1047 MODULE_LICENSE("GPL");