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   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  *      Packet command status bits.
  65  */
  66 #define PC_DMA_IN_PROGRESS              0       /* 1 while DMA in progress */
  67 #define PC_WRITING                      1       /* Data direction */
  68 #define PC_TIMEDOUT                     3       /* command timed out */
  69 #define PC_DMA_OK                       4       /* Use DMA */
  70
  71 /*
  72  *      SCSI command transformation layer
  73  */
  74 #define IDESCSI_SG_TRANSFORM            1       /* /dev/sg transformation */
  75
  76 /*
  77  *      Log flags
  78  */
  79 #define IDESCSI_LOG_CMD                 0       /* Log SCSI commands */
  80
  81 typedef struct ide_scsi_obj {
  82         ide_drive_t             *drive;
  83         ide_driver_t            *driver;
  84         struct gendisk          *disk;
  85         struct Scsi_Host        *host;
  86
  87         struct ide_atapi_pc *pc;                /* Current packet command */
  88         unsigned long flags;                    /* Status/Action flags */
  89         unsigned long transform;                /* SCSI cmd translation layer */
  90         unsigned long log;                      /* log flags */
  91 } idescsi_scsi_t;
  92
  93 static DEFINE_MUTEX(idescsi_ref_mutex);
  94 /* Set by module param to skip cd */
  95 static int idescsi_nocd;
  96
  97 #define ide_scsi_g(disk) \
  98         container_of((disk)->private_data, struct ide_scsi_obj, driver)
  99
 100 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
 101 {
 102         struct ide_scsi_obj *scsi = NULL;
 103
 104         mutex_lock(&idescsi_ref_mutex);
 105         scsi = ide_scsi_g(disk);
 106         if (scsi)
 107                 scsi_host_get(scsi->host);
 108         mutex_unlock(&idescsi_ref_mutex);
 109         return scsi;
 110 }
 111
 112 static void ide_scsi_put(struct ide_scsi_obj *scsi)
 113 {
 114         mutex_lock(&idescsi_ref_mutex);
 115         scsi_host_put(scsi->host);
 116         mutex_unlock(&idescsi_ref_mutex);
 117 }
 118
 119 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
 120 {
 121         return (idescsi_scsi_t*) (&host[1]);
 122 }
 123
 124 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
 125 {
 126         return scsihost_to_idescsi(ide_drive->driver_data);
 127 }
 128
 129 /*
 130  *      Per ATAPI device status bits.
 131  */
 132 #define IDESCSI_DRQ_INTERRUPT           0       /* DRQ interrupt device */
 133
 134 /*
 135  *      ide-scsi requests.
 136  */
 137 #define IDESCSI_PC_RQ                   90
 138
 139 /*
 140  *      PIO data transfer routines using the scatter gather table.
 141  */
 142 static void idescsi_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
 143                 unsigned int bcount)
 144 {
 145         int count;
 146         char *buf;
 147
 148         while (bcount) {
 149                 count = min(pc->sg->length - pc->b_count, bcount);
 150                 if (PageHighMem(sg_page(pc->sg))) {
 151                         unsigned long flags;
 152
 153                         local_irq_save(flags);
 154                         buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
 155                                         pc->sg->offset;
 156                         drive->hwif->atapi_input_bytes(drive,
 157                                                 buf + pc->b_count, count);
 158                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
 159                         local_irq_restore(flags);
 160                 } else {
 161                         buf = sg_virt(pc->sg);
 162                         drive->hwif->atapi_input_bytes(drive,
 163                                                 buf + pc->b_count, count);
 164                 }
 165                 bcount -= count; pc->b_count += count;
 166                 if (pc->b_count == pc->sg->length) {
 167                         if (!--pc->sg_cnt)
 168                                 break;
 169                         pc->sg = sg_next(pc->sg);
 170                         pc->b_count = 0;
 171                 }
 172         }
 173
 174         if (bcount) {
 175                 printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
 176                 ide_atapi_discard_data(drive, bcount);
 177         }
 178 }
 179
 180 static void idescsi_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
 181                 unsigned int bcount)
 182 {
 183         int count;
 184         char *buf;
 185
 186         while (bcount) {
 187                 count = min(pc->sg->length - pc->b_count, bcount);
 188                 if (PageHighMem(sg_page(pc->sg))) {
 189                         unsigned long flags;
 190
 191                         local_irq_save(flags);
 192                         buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
 193                                                 pc->sg->offset;
 194                         drive->hwif->atapi_output_bytes(drive,
 195                                                 buf + pc->b_count, count);
 196                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
 197                         local_irq_restore(flags);
 198                 } else {
 199                         buf = sg_virt(pc->sg);
 200                         drive->hwif->atapi_output_bytes(drive,
 201                                                 buf + pc->b_count, count);
 202                 }
 203                 bcount -= count; pc->b_count += count;
 204                 if (pc->b_count == pc->sg->length) {
 205                         if (!--pc->sg_cnt)
 206                                 break;
 207                         pc->sg = sg_next(pc->sg);
 208                         pc->b_count = 0;
 209                 }
 210         }
 211
 212         if (bcount) {
 213                 printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
 214                 ide_atapi_write_zeros(drive, bcount);
 215         }
 216 }
 217
 218 static void ide_scsi_hex_dump(u8 *data, int len)
 219 {
 220         print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
 221 }
 222
 223 static int idescsi_check_condition(ide_drive_t *drive,
 224                 struct request *failed_cmd)
 225 {
 226         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 227         struct ide_atapi_pc   *pc;
 228         struct request *rq;
 229         u8             *buf;
 230
 231         /* stuff a sense request in front of our current request */
 232         pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
 233         rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
 234         buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
 235         if (!pc || !rq || !buf) {
 236                 kfree(buf);
 237                 kfree(rq);
 238                 kfree(pc);
 239                 return -ENOMEM;
 240         }
 241         ide_init_drive_cmd(rq);
 242         rq->special = (char *) pc;
 243         pc->rq = rq;
 244         pc->buf = buf;
 245         pc->c[0] = REQUEST_SENSE;
 246         pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
 247         rq->cmd_type = REQ_TYPE_SENSE;
 248         pc->timeout = jiffies + WAIT_READY;
 249         /* NOTE! Save the failed packet command in "rq->buffer" */
 250         rq->buffer = (void *) failed_cmd->special;
 251         pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
 252         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 253                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
 254                 ide_scsi_hex_dump(pc->c, 6);
 255         }
 256         rq->rq_disk = scsi->disk;
 257         return ide_do_drive_cmd(drive, rq, ide_preempt);
 258 }
 259
 260 static int idescsi_end_request(ide_drive_t *, int, int);
 261
 262 static ide_startstop_t
 263 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
 264 {
 265         ide_hwif_t *hwif = drive->hwif;
 266
 267         if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT))
 268                 /* force an abort */
 269                 hwif->OUTB(WIN_IDLEIMMEDIATE,
 270                            hwif->io_ports[IDE_COMMAND_OFFSET]);
 271
 272         rq->errors++;
 273
 274         idescsi_end_request(drive, 0, 0);
 275
 276         return ide_stopped;
 277 }
 278
 279 static ide_startstop_t
 280 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
 281 {
 282 #if IDESCSI_DEBUG_LOG
 283         printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
 284                 ((struct ide_atapi_pc *) rq->special)->scsi_cmd->serial_number);
 285 #endif
 286         rq->errors |= ERROR_MAX;
 287
 288         idescsi_end_request(drive, 0, 0);
 289
 290         return ide_stopped;
 291 }
 292
 293 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
 294 {
 295         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 296         struct request *rq = HWGROUP(drive)->rq;
 297         struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
 298         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
 299         struct Scsi_Host *host;
 300         int errors = rq->errors;
 301         unsigned long flags;
 302
 303         if (!blk_special_request(rq) && !blk_sense_request(rq)) {
 304                 ide_end_request(drive, uptodate, nrsecs);
 305                 return 0;
 306         }
 307         ide_end_drive_cmd (drive, 0, 0);
 308         if (blk_sense_request(rq)) {
 309                 struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
 310                 if (log) {
 311                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
 312                         ide_scsi_hex_dump(pc->buf, 16);
 313                 }
 314                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
 315                         SCSI_SENSE_BUFFERSIZE);
 316                 kfree(pc->buf);
 317                 kfree(pc);
 318                 kfree(rq);
 319                 pc = opc;
 320                 rq = pc->rq;
 321                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
 322                                         ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
 323         } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
 324                 if (log)
 325                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
 326                                         drive->name, pc->scsi_cmd->serial_number);
 327                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
 328         } else if (errors >= ERROR_MAX) {
 329                 pc->scsi_cmd->result = DID_ERROR << 16;
 330                 if (log)
 331                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 332         } else if (errors) {
 333                 if (log)
 334                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 335                 if (!idescsi_check_condition(drive, rq))
 336                         /* we started a request sense, so we'll be back, exit for now */
 337                         return 0;
 338                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
 339         } else {
 340                 pc->scsi_cmd->result = DID_OK << 16;
 341         }
 342         host = pc->scsi_cmd->device->host;
 343         spin_lock_irqsave(host->host_lock, flags);
 344         pc->done(pc->scsi_cmd);
 345         spin_unlock_irqrestore(host->host_lock, flags);
 346         kfree(pc);
 347         kfree(rq);
 348         scsi->pc = NULL;
 349         return 0;
 350 }
 351
 352 static inline unsigned long get_timeout(struct ide_atapi_pc *pc)
 353 {
 354         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
 355 }
 356
 357 static int idescsi_expiry(ide_drive_t *drive)
 358 {
 359         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 360         struct ide_atapi_pc   *pc   = scsi->pc;
 361
 362 #if IDESCSI_DEBUG_LOG
 363         printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
 364 #endif
 365         set_bit(PC_TIMEDOUT, &pc->flags);
 366
 367         return 0;                                       /* we do not want the ide subsystem to retry */
 368 }
 369
 370 /*
 371  *      Our interrupt handler.
 372  */
 373 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
 374 {
 375         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 376         ide_hwif_t *hwif = drive->hwif;
 377         struct ide_atapi_pc *pc = scsi->pc;
 378         struct request *rq = pc->rq;
 379         unsigned int temp;
 380         u16 bcount;
 381         u8 stat, ireason;
 382
 383 #if IDESCSI_DEBUG_LOG
 384         printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
 385 #endif /* IDESCSI_DEBUG_LOG */
 386
 387         if (test_bit(PC_TIMEDOUT, &pc->flags)){
 388 #if IDESCSI_DEBUG_LOG
 389                 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet  %lu at %lu\n",
 390                                 pc->scsi_cmd->serial_number, jiffies);
 391 #endif
 392                 /* end this request now - scsi should retry it*/
 393                 idescsi_end_request (drive, 1, 0);
 394                 return ide_stopped;
 395         }
 396         if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
 397 #if IDESCSI_DEBUG_LOG
 398                 printk ("ide-scsi: %s: DMA complete\n", drive->name);
 399 #endif /* IDESCSI_DEBUG_LOG */
 400                 pc->xferred = pc->req_xfer;
 401                 (void) HWIF(drive)->ide_dma_end(drive);
 402         }
 403
 404         /* Clear the interrupt */
 405         stat = ide_read_status(drive);
 406
 407         if ((stat & DRQ_STAT) == 0) {
 408                 /* No more interrupts */
 409                 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 410                         printk(KERN_INFO "Packet command completed, %d bytes"
 411                                         " transferred\n", pc->xferred);
 412                 local_irq_enable_in_hardirq();
 413                 if (stat & ERR_STAT)
 414                         rq->errors++;
 415                 idescsi_end_request (drive, 1, 0);
 416                 return ide_stopped;
 417         }
 418         bcount = (hwif->INB(hwif->io_ports[IDE_BCOUNTH_OFFSET]) << 8) |
 419                   hwif->INB(hwif->io_ports[IDE_BCOUNTL_OFFSET]);
 420         ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
 421
 422         if (ireason & CD) {
 423                 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
 424                 return ide_do_reset (drive);
 425         }
 426         if (ireason & IO) {
 427                 temp = pc->xferred + bcount;
 428                 if (temp > pc->req_xfer) {
 429                         if (temp > pc->buf_size) {
 430                                 printk(KERN_ERR "ide-scsi: The scsi wants to "
 431                                         "send us more data than expected "
 432                                         "- discarding data\n");
 433                                 temp = pc->buf_size - pc->xferred;
 434                                 if (temp) {
 435                                         clear_bit(PC_WRITING, &pc->flags);
 436                                         if (pc->sg)
 437                                                 idescsi_input_buffers(drive, pc,
 438                                                                         temp);
 439                                         else
 440                                                 drive->hwif->atapi_input_bytes(drive, pc->cur_pos, temp);
 441                                         printk(KERN_ERR "ide-scsi: transferred"
 442                                                         " %d of %d bytes\n",
 443                                                         temp, bcount);
 444                                 }
 445                                 pc->xferred += temp;
 446                                 pc->cur_pos += temp;
 447                                 ide_atapi_discard_data(drive, bcount - temp);
 448                                 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 449                                 return ide_started;
 450                         }
 451 #if IDESCSI_DEBUG_LOG
 452                         printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
 453 #endif /* IDESCSI_DEBUG_LOG */
 454                 }
 455         }
 456         if (ireason & IO) {
 457                 clear_bit(PC_WRITING, &pc->flags);
 458                 if (pc->sg)
 459                         idescsi_input_buffers(drive, pc, bcount);
 460                 else
 461                         hwif->atapi_input_bytes(drive, pc->cur_pos,
 462                                                 bcount);
 463         } else {
 464                 set_bit(PC_WRITING, &pc->flags);
 465                 if (pc->sg)
 466                         idescsi_output_buffers(drive, pc, bcount);
 467                 else
 468                         hwif->atapi_output_bytes(drive, pc->cur_pos,
 469                                                  bcount);
 470         }
 471         /* Update the current position */
 472         pc->xferred += bcount;
 473         pc->cur_pos += bcount;
 474
 475         /* And set the interrupt handler again */
 476         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 477         return ide_started;
 478 }
 479
 480 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
 481 {
 482         ide_hwif_t *hwif = drive->hwif;
 483         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 484         struct ide_atapi_pc *pc = scsi->pc;
 485         ide_startstop_t startstop;
 486         u8 ireason;
 487
 488         if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
 489                 printk(KERN_ERR "ide-scsi: Strange, packet command "
 490                         "initiated yet DRQ isn't asserted\n");
 491                 return startstop;
 492         }
 493         ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
 494         if ((ireason & CD) == 0 || (ireason & IO)) {
 495                 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
 496                                 "issuing a packet command\n");
 497                 return ide_do_reset (drive);
 498         }
 499         BUG_ON(HWGROUP(drive)->handler != NULL);
 500         /* Set the interrupt routine */
 501         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 502         /* Send the actual packet */
 503         drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
 504         if (test_bit (PC_DMA_OK, &pc->flags)) {
 505                 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
 506                 hwif->dma_start(drive);
 507         }
 508         return ide_started;
 509 }
 510
 511 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
 512 {
 513         switch (pc->c[0]) {
 514                 case READ_6: case READ_10: case READ_12:
 515                         clear_bit(PC_WRITING, &pc->flags);
 516                         return 0;
 517                 case WRITE_6: case WRITE_10: case WRITE_12:
 518                         set_bit(PC_WRITING, &pc->flags);
 519                         return 0;
 520                 default:
 521                         return 1;
 522         }
 523 }
 524
 525 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
 526 {
 527         ide_hwif_t *hwif = drive->hwif;
 528         struct scatterlist *sg, *scsi_sg;
 529         int segments;
 530
 531         if (!pc->req_xfer || pc->req_xfer % 1024)
 532                 return 1;
 533
 534         if (idescsi_set_direction(pc))
 535                 return 1;
 536
 537         sg = hwif->sg_table;
 538         scsi_sg = scsi_sglist(pc->scsi_cmd);
 539         segments = scsi_sg_count(pc->scsi_cmd);
 540
 541         if (segments > hwif->sg_max_nents)
 542                 return 1;
 543
 544         hwif->sg_nents = segments;
 545         memcpy(sg, scsi_sg, sizeof(*sg) * segments);
 546
 547         return 0;
 548 }
 549
 550 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
 551                 struct ide_atapi_pc *pc)
 552 {
 553         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 554         ide_hwif_t *hwif = drive->hwif;
 555         u16 bcount;
 556         u8 dma = 0;
 557
 558         /* Set the current packet command */
 559         scsi->pc = pc;
 560         /* We haven't transferred any data yet */
 561         pc->xferred = 0;
 562         pc->cur_pos = pc->buf;
 563         /* Request to transfer the entire buffer at once */
 564         bcount = min(pc->req_xfer, 63 * 1024);
 565
 566         if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
 567                 hwif->sg_mapped = 1;
 568                 dma = !hwif->dma_setup(drive);
 569                 hwif->sg_mapped = 0;
 570         }
 571
 572         ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK, bcount, dma);
 573
 574         if (dma)
 575                 set_bit(PC_DMA_OK, &pc->flags);
 576
 577         if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
 578                 ide_execute_command(drive, WIN_PACKETCMD, &idescsi_transfer_pc,
 579                                     get_timeout(pc), idescsi_expiry);
 580                 return ide_started;
 581         } else {
 582                 /* Issue the packet command */
 583                 hwif->OUTB(WIN_PACKETCMD, hwif->io_ports[IDE_COMMAND_OFFSET]);
 584                 return idescsi_transfer_pc(drive);
 585         }
 586 }
 587
 588 /*
 589  *      idescsi_do_request is our request handling function.
 590  */
 591 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
 592 {
 593 #if IDESCSI_DEBUG_LOG
 594         printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
 595         printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
 596 #endif /* IDESCSI_DEBUG_LOG */
 597
 598         if (blk_sense_request(rq) || blk_special_request(rq)) {
 599                 return idescsi_issue_pc(drive,
 600                                 (struct ide_atapi_pc *) rq->special);
 601         }
 602         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
 603         idescsi_end_request (drive, 0, 0);
 604         return ide_stopped;
 605 }
 606
 607 #ifdef CONFIG_IDE_PROC_FS
 608 static void idescsi_add_settings(ide_drive_t *drive)
 609 {
 610         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 611
 612 /*
 613  *                      drive   setting name    read/write      data type       min     max     mul_factor      div_factor      data pointer            set function
 614  */
 615         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
 616         ide_add_setting(drive,  "bios_head",    SETTING_RW,     TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
 617         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
 618         ide_add_setting(drive,  "transform",    SETTING_RW,     TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
 619         ide_add_setting(drive,  "log",          SETTING_RW,     TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
 620 }
 621 #else
 622 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
 623 #endif
 624
 625 /*
 626  *      Driver initialization.
 627  */
 628 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 629 {
 630         if (drive->id && (drive->id->config & 0x0060) == 0x20)
 631                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
 632         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 633 #if IDESCSI_DEBUG_LOG
 634         set_bit(IDESCSI_LOG_CMD, &scsi->log);
 635 #endif /* IDESCSI_DEBUG_LOG */
 636         idescsi_add_settings(drive);
 637 }
 638
 639 static void ide_scsi_remove(ide_drive_t *drive)
 640 {
 641         struct Scsi_Host *scsihost = drive->driver_data;
 642         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
 643         struct gendisk *g = scsi->disk;
 644
 645         scsi_remove_host(scsihost);
 646         ide_proc_unregister_driver(drive, scsi->driver);
 647
 648         ide_unregister_region(g);
 649
 650         drive->driver_data = NULL;
 651         g->private_data = NULL;
 652         put_disk(g);
 653
 654         ide_scsi_put(scsi);
 655 }
 656
 657 static int ide_scsi_probe(ide_drive_t *);
 658
 659 #ifdef CONFIG_IDE_PROC_FS
 660 static ide_proc_entry_t idescsi_proc[] = {
 661         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
 662         { NULL, 0, NULL, NULL }
 663 };
 664 #endif
 665
 666 static ide_driver_t idescsi_driver = {
 667         .gen_driver = {
 668                 .owner          = THIS_MODULE,
 669                 .name           = "ide-scsi",
 670                 .bus            = &ide_bus_type,
 671         },
 672         .probe                  = ide_scsi_probe,
 673         .remove                 = ide_scsi_remove,
 674         .version                = IDESCSI_VERSION,
 675         .media                  = ide_scsi,
 676         .supports_dsc_overlap   = 0,
 677         .do_request             = idescsi_do_request,
 678         .end_request            = idescsi_end_request,
 679         .error                  = idescsi_atapi_error,
 680         .abort                  = idescsi_atapi_abort,
 681 #ifdef CONFIG_IDE_PROC_FS
 682         .proc                   = idescsi_proc,
 683 #endif
 684 };
 685
 686 static int idescsi_ide_open(struct inode *inode, struct file *filp)
 687 {
 688         struct gendisk *disk = inode->i_bdev->bd_disk;
 689         struct ide_scsi_obj *scsi;
 690
 691         if (!(scsi = ide_scsi_get(disk)))
 692                 return -ENXIO;
 693
 694         return 0;
 695 }
 696
 697 static int idescsi_ide_release(struct inode *inode, struct file *filp)
 698 {
 699         struct gendisk *disk = inode->i_bdev->bd_disk;
 700         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
 701
 702         ide_scsi_put(scsi);
 703
 704         return 0;
 705 }
 706
 707 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
 708                         unsigned int cmd, unsigned long arg)
 709 {
 710         struct block_device *bdev = inode->i_bdev;
 711         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
 712         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
 713 }
 714
 715 static struct block_device_operations idescsi_ops = {
 716         .owner          = THIS_MODULE,
 717         .open           = idescsi_ide_open,
 718         .release        = idescsi_ide_release,
 719         .ioctl          = idescsi_ide_ioctl,
 720 };
 721
 722 static int idescsi_slave_configure(struct scsi_device * sdp)
 723 {
 724         /* Configure detected device */
 725         sdp->use_10_for_rw = 1;
 726         sdp->use_10_for_ms = 1;
 727         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
 728         return 0;
 729 }
 730
 731 static const char *idescsi_info (struct Scsi_Host *host)
 732 {
 733         return "SCSI host adapter emulation for IDE ATAPI devices";
 734 }
 735
 736 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
 737 {
 738         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
 739
 740         if (cmd == SG_SET_TRANSFORM) {
 741                 if (arg)
 742                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 743                 else
 744                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 745                 return 0;
 746         } else if (cmd == SG_GET_TRANSFORM)
 747                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
 748         return -EINVAL;
 749 }
 750
 751 static int idescsi_queue (struct scsi_cmnd *cmd,
 752                 void (*done)(struct scsi_cmnd *))
 753 {
 754         struct Scsi_Host *host = cmd->device->host;
 755         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
 756         ide_drive_t *drive = scsi->drive;
 757         struct request *rq = NULL;
 758         struct ide_atapi_pc *pc = NULL;
 759
 760         if (!drive) {
 761                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
 762                 goto abort;
 763         }
 764         scsi = drive_to_idescsi(drive);
 765         pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
 766         rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
 767         if (rq == NULL || pc == NULL) {
 768                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
 769                 goto abort;
 770         }
 771
 772         memset (pc->c, 0, 12);
 773         pc->flags = 0;
 774         pc->rq = rq;
 775         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
 776         pc->buf = NULL;
 777         pc->sg = scsi_sglist(cmd);
 778         pc->sg_cnt = scsi_sg_count(cmd);
 779         pc->b_count = 0;
 780         pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
 781         pc->scsi_cmd = cmd;
 782         pc->done = done;
 783         pc->timeout = jiffies + cmd->timeout_per_command;
 784
 785         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 786                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
 787                 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
 788                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
 789                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
 790                         ide_scsi_hex_dump(pc->c, 12);
 791                 }
 792         }
 793
 794         ide_init_drive_cmd (rq);
 795         rq->special = (char *) pc;
 796         rq->cmd_type = REQ_TYPE_SPECIAL;
 797         spin_unlock_irq(host->host_lock);
 798         rq->rq_disk = scsi->disk;
 799         (void) ide_do_drive_cmd (drive, rq, ide_end);
 800         spin_lock_irq(host->host_lock);
 801         return 0;
 802 abort:
 803         kfree (pc);
 804         kfree (rq);
 805         cmd->result = DID_ERROR << 16;
 806         done(cmd);
 807         return 0;
 808 }
 809
 810 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
 811 {
 812         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 813         ide_drive_t    *drive = scsi->drive;
 814         int             busy;
 815         int             ret   = FAILED;
 816
 817         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
 818
 819         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 820                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
 821
 822         if (!drive) {
 823                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
 824                 WARN_ON(1);
 825                 goto no_drive;
 826         }
 827
 828         /* First give it some more time, how much is "right" is hard to say :-( */
 829
 830         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
 831         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 832                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
 833
 834         spin_lock_irq(&ide_lock);
 835
 836         /* If there is no pc running we're done (our interrupt took care of it) */
 837         if (!scsi->pc) {
 838                 ret = SUCCESS;
 839                 goto ide_unlock;
 840         }
 841
 842         /* It's somewhere in flight. Does ide subsystem agree? */
 843         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
 844             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
 845                 /*
 846                  * FIXME - not sure this condition can ever occur
 847                  */
 848                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
 849
 850                 if (blk_sense_request(scsi->pc->rq))
 851                         kfree(scsi->pc->buf);
 852                 kfree(scsi->pc->rq);
 853                 kfree(scsi->pc);
 854                 scsi->pc = NULL;
 855
 856                 ret = SUCCESS;
 857         }
 858
 859 ide_unlock:
 860         spin_unlock_irq(&ide_lock);
 861 no_drive:
 862         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 863                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
 864
 865         return ret;
 866 }
 867
 868 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
 869 {
 870         struct request *req;
 871         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 872         ide_drive_t    *drive = scsi->drive;
 873         int             ready = 0;
 874         int             ret   = SUCCESS;
 875
 876         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
 877
 878         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 879                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
 880
 881         if (!drive) {
 882                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
 883                 WARN_ON(1);
 884                 return FAILED;
 885         }
 886
 887         spin_lock_irq(cmd->device->host->host_lock);
 888         spin_lock(&ide_lock);
 889
 890         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
 891                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
 892                 spin_unlock(&ide_lock);
 893                 spin_unlock_irq(cmd->device->host->host_lock);
 894                 return FAILED;
 895         }
 896
 897         /* kill current request */
 898         if (__blk_end_request(req, -EIO, 0))
 899                 BUG();
 900         if (blk_sense_request(req))
 901                 kfree(scsi->pc->buf);
 902         kfree(scsi->pc);
 903         scsi->pc = NULL;
 904         kfree(req);
 905
 906         /* now nuke the drive queue */
 907         while ((req = elv_next_request(drive->queue))) {
 908                 if (__blk_end_request(req, -EIO, 0))
 909                         BUG();
 910         }
 911
 912         HWGROUP(drive)->rq = NULL;
 913         HWGROUP(drive)->handler = NULL;
 914         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
 915         spin_unlock(&ide_lock);
 916
 917         ide_do_reset(drive);
 918
 919         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
 920
 921         do {
 922                 spin_unlock_irq(cmd->device->host->host_lock);
 923                 msleep(50);
 924                 spin_lock_irq(cmd->device->host->host_lock);
 925         } while ( HWGROUP(drive)->handler );
 926
 927         ready = drive_is_ready(drive);
 928         HWGROUP(drive)->busy--;
 929         if (!ready) {
 930                 printk (KERN_ERR "ide-scsi: reset failed!\n");
 931                 ret = FAILED;
 932         }
 933
 934         spin_unlock_irq(cmd->device->host->host_lock);
 935         return ret;
 936 }
 937
 938 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
 939                 sector_t capacity, int *parm)
 940 {
 941         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
 942         ide_drive_t *drive = idescsi->drive;
 943
 944         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
 945                 parm[0] = drive->bios_head;
 946                 parm[1] = drive->bios_sect;
 947                 parm[2] = drive->bios_cyl;
 948         }
 949         return 0;
 950 }
 951
 952 static struct scsi_host_template idescsi_template = {
 953         .module                 = THIS_MODULE,
 954         .name                   = "idescsi",
 955         .info                   = idescsi_info,
 956         .slave_configure        = idescsi_slave_configure,
 957         .ioctl                  = idescsi_ioctl,
 958         .queuecommand           = idescsi_queue,
 959         .eh_abort_handler       = idescsi_eh_abort,
 960         .eh_host_reset_handler  = idescsi_eh_reset,
 961         .bios_param             = idescsi_bios,
 962         .can_queue              = 40,
 963         .this_id                = -1,
 964         .sg_tablesize           = 256,
 965         .cmd_per_lun            = 5,
 966         .max_sectors            = 128,
 967         .use_clustering         = DISABLE_CLUSTERING,
 968         .emulated               = 1,
 969         .proc_name              = "ide-scsi",
 970 };
 971
 972 static int ide_scsi_probe(ide_drive_t *drive)
 973 {
 974         idescsi_scsi_t *idescsi;
 975         struct Scsi_Host *host;
 976         struct gendisk *g;
 977         static int warned;
 978         int err = -ENOMEM;
 979
 980         if (!warned && drive->media == ide_cdrom) {
 981                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
 982                 warned = 1;
 983         }
 984
 985         if (idescsi_nocd && drive->media == ide_cdrom)
 986                 return -ENODEV;
 987
 988         if (!strstr("ide-scsi", drive->driver_req) ||
 989             !drive->present ||
 990             drive->media == ide_disk ||
 991             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
 992                 return -ENODEV;
 993
 994         g = alloc_disk(1 << PARTN_BITS);
 995         if (!g)
 996                 goto out_host_put;
 997
 998         ide_init_disk(g, drive);
 999
1000         host->max_id = 1;
1001
1002 #if IDESCSI_DEBUG_LOG
1003         if (drive->id->last_lun)
1004                 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1005 #endif
1006         if ((drive->id->last_lun & 0x7) != 7)
1007                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1008         else
1009                 host->max_lun = 1;
1010
1011         drive->driver_data = host;
1012         idescsi = scsihost_to_idescsi(host);
1013         idescsi->drive = drive;
1014         idescsi->driver = &idescsi_driver;
1015         idescsi->host = host;
1016         idescsi->disk = g;
1017         g->private_data = &idescsi->driver;
1018         ide_proc_register_driver(drive, &idescsi_driver);
1019         err = 0;
1020         idescsi_setup(drive, idescsi);
1021         g->fops = &idescsi_ops;
1022         ide_register_region(g);
1023         err = scsi_add_host(host, &drive->gendev);
1024         if (!err) {
1025                 scsi_scan_host(host);
1026                 return 0;
1027         }
1028         /* fall through on error */
1029         ide_unregister_region(g);
1030         ide_proc_unregister_driver(drive, &idescsi_driver);
1031
1032         put_disk(g);
1033 out_host_put:
1034         scsi_host_put(host);
1035         return err;
1036 }
1037
1038 static int __init init_idescsi_module(void)
1039 {
1040         return driver_register(&idescsi_driver.gen_driver);
1041 }
1042
1043 static void __exit exit_idescsi_module(void)
1044 {
1045         driver_unregister(&idescsi_driver.gen_driver);
1046 }
1047
1048 module_param(idescsi_nocd, int, 0600);
1049 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1050 module_init(init_idescsi_module);
1051 module_exit(exit_idescsi_module);
1052 MODULE_LICENSE("GPL");