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   1 /*
   2  * ATAPI CD-ROM driver.
   3  *
   4  * Copyright (C) 1994-1996   Scott Snyder <snyder@fnald0.fnal.gov>
   5  * Copyright (C) 1996-1998   Erik Andersen <andersee@debian.org>
   6  * Copyright (C) 1998-2000   Jens Axboe <axboe@suse.de>
   7  * Copyright (C) 2005, 2007  Bartlomiej Zolnierkiewicz
   8  *
   9  * May be copied or modified under the terms of the GNU General Public
  10  * License.  See linux/COPYING for more information.
  11  *
  12  * See Documentation/cdrom/ide-cd for usage information.
  13  *
  14  * Suggestions are welcome. Patches that work are more welcome though. ;-)
  15  * For those wishing to work on this driver, please be sure you download
  16  * and comply with the latest Mt. Fuji (SFF8090 version 4) and ATAPI
  17  * (SFF-8020i rev 2.6) standards. These documents can be obtained by
  18  * anonymous ftp from:
  19  * ftp://fission.dt.wdc.com/pub/standards/SFF_atapi/spec/SFF8020-r2.6/PS/8020r26.ps
  20  * ftp://ftp.avc-pioneer.com/Mtfuji4/Spec/Fuji4r10.pdf
  21  *
  22  * For historical changelog please see:
  23  *      Documentation/ide/ChangeLog.ide-cd.1994-2004
  24  */
  25
  26 #define IDECD_VERSION "5.00"
  27
  28 #include <linux/module.h>
  29 #include <linux/types.h>
  30 #include <linux/kernel.h>
  31 #include <linux/delay.h>
  32 #include <linux/timer.h>
  33 #include <linux/slab.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/errno.h>
  36 #include <linux/cdrom.h>
  37 #include <linux/ide.h>
  38 #include <linux/completion.h>
  39 #include <linux/mutex.h>
  40 #include <linux/bcd.h>
  41
  42 /* For SCSI -> ATAPI command conversion */
  43 #include <scsi/scsi.h>
  44
  45 #include <linux/irq.h>
  46 #include <linux/io.h>
  47 #include <asm/byteorder.h>
  48 #include <linux/uaccess.h>
  49 #include <asm/unaligned.h>
  50
  51 #include "ide-cd.h"
  52
  53 static DEFINE_MUTEX(idecd_ref_mutex);
  54
  55 #define to_ide_cd(obj) container_of(obj, struct cdrom_info, kref)
  56
  57 #define ide_cd_g(disk) \
  58         container_of((disk)->private_data, struct cdrom_info, driver)
  59
  60 static struct cdrom_info *ide_cd_get(struct gendisk *disk)
  61 {
  62         struct cdrom_info *cd = NULL;
  63
  64         mutex_lock(&idecd_ref_mutex);
  65         cd = ide_cd_g(disk);
  66         if (cd)
  67                 kref_get(&cd->kref);
  68         mutex_unlock(&idecd_ref_mutex);
  69         return cd;
  70 }
  71
  72 static void ide_cd_release(struct kref *);
  73
  74 static void ide_cd_put(struct cdrom_info *cd)
  75 {
  76         mutex_lock(&idecd_ref_mutex);
  77         kref_put(&cd->kref, ide_cd_release);
  78         mutex_unlock(&idecd_ref_mutex);
  79 }
  80
  81 /*
  82  * Generic packet command support and error handling routines.
  83  */
  84
  85 /* Mark that we've seen a media change and invalidate our internal buffers. */
  86 static void cdrom_saw_media_change(ide_drive_t *drive)
  87 {
  88         struct cdrom_info *cd = drive->driver_data;
  89
  90         cd->cd_flags |= IDE_CD_FLAG_MEDIA_CHANGED;
  91         cd->cd_flags &= ~IDE_CD_FLAG_TOC_VALID;
  92 }
  93
  94 static int cdrom_log_sense(ide_drive_t *drive, struct request *rq,
  95                            struct request_sense *sense)
  96 {
  97         int log = 0;
  98
  99         if (!sense || !rq || (rq->cmd_flags & REQ_QUIET))
 100                 return 0;
 101
 102         switch (sense->sense_key) {
 103         case NO_SENSE:
 104         case RECOVERED_ERROR:
 105                 break;
 106         case NOT_READY:
 107                 /*
 108                  * don't care about tray state messages for e.g. capacity
 109                  * commands or in-progress or becoming ready
 110                  */
 111                 if (sense->asc == 0x3a || sense->asc == 0x04)
 112                         break;
 113                 log = 1;
 114                 break;
 115         case ILLEGAL_REQUEST:
 116                 /*
 117                  * don't log START_STOP unit with LoEj set, since we cannot
 118                  * reliably check if drive can auto-close
 119                  */
 120                 if (rq->cmd[0] == GPCMD_START_STOP_UNIT && sense->asc == 0x24)
 121                         break;
 122                 log = 1;
 123                 break;
 124         case UNIT_ATTENTION:
 125                 /*
 126                  * Make good and sure we've seen this potential media change.
 127                  * Some drives (i.e. Creative) fail to present the correct sense
 128                  * key in the error register.
 129                  */
 130                 cdrom_saw_media_change(drive);
 131                 break;
 132         default:
 133                 log = 1;
 134                 break;
 135         }
 136         return log;
 137 }
 138
 139 static void cdrom_analyze_sense_data(ide_drive_t *drive,
 140                               struct request *failed_command,
 141                               struct request_sense *sense)
 142 {
 143         unsigned long sector;
 144         unsigned long bio_sectors;
 145         struct cdrom_info *info = drive->driver_data;
 146
 147         if (!cdrom_log_sense(drive, failed_command, sense))
 148                 return;
 149
 150         /*
 151          * If a read toc is executed for a CD-R or CD-RW medium where the first
 152          * toc has not been recorded yet, it will fail with 05/24/00 (which is a
 153          * confusing error)
 154          */
 155         if (failed_command && failed_command->cmd[0] == GPCMD_READ_TOC_PMA_ATIP)
 156                 if (sense->sense_key == 0x05 && sense->asc == 0x24)
 157                         return;
 158
 159         /* current error */
 160         if (sense->error_code == 0x70) {
 161                 switch (sense->sense_key) {
 162                 case MEDIUM_ERROR:
 163                 case VOLUME_OVERFLOW:
 164                 case ILLEGAL_REQUEST:
 165                         if (!sense->valid)
 166                                 break;
 167                         if (failed_command == NULL ||
 168                                         !blk_fs_request(failed_command))
 169                                 break;
 170                         sector = (sense->information[0] << 24) |
 171                                  (sense->information[1] << 16) |
 172                                  (sense->information[2] <<  8) |
 173                                  (sense->information[3]);
 174
 175                         if (drive->queue->hardsect_size == 2048)
 176                                 /* device sector size is 2K */
 177                                 sector <<= 2;
 178
 179                         bio_sectors = max(bio_sectors(failed_command->bio), 4U);
 180                         sector &= ~(bio_sectors - 1);
 181
 182                         if (sector < get_capacity(info->disk) &&
 183                             drive->probed_capacity - sector < 4 * 75)
 184                                 set_capacity(info->disk, sector);
 185                 }
 186         }
 187
 188         ide_cd_log_error(drive->name, failed_command, sense);
 189 }
 190
 191 /* Initialize a ide-cd packet command request */
 192 void ide_cd_init_rq(ide_drive_t *drive, struct request *rq)
 193 {
 194         struct cdrom_info *cd = drive->driver_data;
 195
 196         ide_init_drive_cmd(rq);
 197         rq->cmd_type = REQ_TYPE_ATA_PC;
 198         rq->rq_disk = cd->disk;
 199 }
 200
 201 static void cdrom_queue_request_sense(ide_drive_t *drive, void *sense,
 202                                       struct request *failed_command)
 203 {
 204         struct cdrom_info *info         = drive->driver_data;
 205         struct request *rq              = &info->request_sense_request;
 206
 207         if (sense == NULL)
 208                 sense = &info->sense_data;
 209
 210         /* stuff the sense request in front of our current request */
 211         ide_cd_init_rq(drive, rq);
 212
 213         rq->data = sense;
 214         rq->cmd[0] = GPCMD_REQUEST_SENSE;
 215         rq->cmd[4] = 18;
 216         rq->data_len = 18;
 217
 218         rq->cmd_type = REQ_TYPE_SENSE;
 219         rq->cmd_flags |= REQ_PREEMPT;
 220
 221         /* NOTE! Save the failed command in "rq->buffer" */
 222         rq->buffer = (void *) failed_command;
 223
 224         (void) ide_do_drive_cmd(drive, rq, ide_preempt);
 225 }
 226
 227 static void cdrom_end_request(ide_drive_t *drive, int uptodate)
 228 {
 229         struct request *rq = HWGROUP(drive)->rq;
 230         int nsectors = rq->hard_cur_sectors;
 231
 232         if (blk_sense_request(rq) && uptodate) {
 233                 /*
 234                  * For REQ_TYPE_SENSE, "rq->buffer" points to the original
 235                  * failed request
 236                  */
 237                 struct request *failed = (struct request *) rq->buffer;
 238                 struct cdrom_info *info = drive->driver_data;
 239                 void *sense = &info->sense_data;
 240                 unsigned long flags;
 241
 242                 if (failed) {
 243                         if (failed->sense) {
 244                                 sense = failed->sense;
 245                                 failed->sense_len = rq->sense_len;
 246                         }
 247                         cdrom_analyze_sense_data(drive, failed, sense);
 248                         /*
 249                          * now end the failed request
 250                          */
 251                         if (blk_fs_request(failed)) {
 252                                 if (ide_end_dequeued_request(drive, failed, 0,
 253                                                 failed->hard_nr_sectors))
 254                                         BUG();
 255                         } else {
 256                                 spin_lock_irqsave(&ide_lock, flags);
 257                                 if (__blk_end_request(failed, -EIO,
 258                                                       failed->data_len))
 259                                         BUG();
 260                                 spin_unlock_irqrestore(&ide_lock, flags);
 261                         }
 262                 } else
 263                         cdrom_analyze_sense_data(drive, NULL, sense);
 264         }
 265
 266         if (!rq->current_nr_sectors && blk_fs_request(rq))
 267                 uptodate = 1;
 268         /* make sure it's fully ended */
 269         if (blk_pc_request(rq))
 270                 nsectors = (rq->data_len + 511) >> 9;
 271         if (!nsectors)
 272                 nsectors = 1;
 273
 274         ide_end_request(drive, uptodate, nsectors);
 275 }
 276
 277 static void ide_dump_status_no_sense(ide_drive_t *drive, const char *msg, u8 st)
 278 {
 279         if (st & 0x80)
 280                 return;
 281         ide_dump_status(drive, msg, st);
 282 }
 283
 284 /*
 285  * Returns:
 286  * 0: if the request should be continued.
 287  * 1: if the request was ended.
 288  */
 289 static int cdrom_decode_status(ide_drive_t *drive, int good_stat, int *stat_ret)
 290 {
 291         struct request *rq = HWGROUP(drive)->rq;
 292         int stat, err, sense_key;
 293
 294         /* check for errors */
 295         stat = ide_read_status(drive);
 296
 297         if (stat_ret)
 298                 *stat_ret = stat;
 299
 300         if (OK_STAT(stat, good_stat, BAD_R_STAT))
 301                 return 0;
 302
 303         /* get the IDE error register */
 304         err = ide_read_error(drive);
 305         sense_key = err >> 4;
 306
 307         if (rq == NULL) {
 308                 printk(KERN_ERR "%s: missing rq in %s\n",
 309                                 drive->name, __func__);
 310                 return 1;
 311         }
 312
 313         if (blk_sense_request(rq)) {
 314                 /*
 315                  * We got an error trying to get sense info from the drive
 316                  * (probably while trying to recover from a former error).
 317                  * Just give up.
 318                  */
 319                 rq->cmd_flags |= REQ_FAILED;
 320                 cdrom_end_request(drive, 0);
 321                 ide_error(drive, "request sense failure", stat);
 322                 return 1;
 323
 324         } else if (blk_pc_request(rq) || rq->cmd_type == REQ_TYPE_ATA_PC) {
 325                 /* All other functions, except for READ. */
 326
 327                 /*
 328                  * if we have an error, pass back CHECK_CONDITION as the
 329                  * scsi status byte
 330                  */
 331                 if (blk_pc_request(rq) && !rq->errors)
 332                         rq->errors = SAM_STAT_CHECK_CONDITION;
 333
 334                 /* check for tray open */
 335                 if (sense_key == NOT_READY) {
 336                         cdrom_saw_media_change(drive);
 337                 } else if (sense_key == UNIT_ATTENTION) {
 338                         /* check for media change */
 339                         cdrom_saw_media_change(drive);
 340                         return 0;
 341                 } else if (sense_key == ILLEGAL_REQUEST &&
 342                            rq->cmd[0] == GPCMD_START_STOP_UNIT) {
 343                         /*
 344                          * Don't print error message for this condition--
 345                          * SFF8090i indicates that 5/24/00 is the correct
 346                          * response to a request to close the tray if the
 347                          * drive doesn't have that capability.
 348                          * cdrom_log_sense() knows this!
 349                          */
 350                 } else if (!(rq->cmd_flags & REQ_QUIET)) {
 351                         /* otherwise, print an error */
 352                         ide_dump_status(drive, "packet command error", stat);
 353                 }
 354
 355                 rq->cmd_flags |= REQ_FAILED;
 356
 357                 /*
 358                  * instead of playing games with moving completions around,
 359                  * remove failed request completely and end it when the
 360                  * request sense has completed
 361                  */
 362                 goto end_request;
 363
 364         } else if (blk_fs_request(rq)) {
 365                 int do_end_request = 0;
 366
 367                 /* handle errors from READ and WRITE requests */
 368
 369                 if (blk_noretry_request(rq))
 370                         do_end_request = 1;
 371
 372                 if (sense_key == NOT_READY) {
 373                         /* tray open */
 374                         if (rq_data_dir(rq) == READ) {
 375                                 cdrom_saw_media_change(drive);
 376
 377                                 /* fail the request */
 378                                 printk(KERN_ERR "%s: tray open\n", drive->name);
 379                                 do_end_request = 1;
 380                         } else {
 381                                 struct cdrom_info *info = drive->driver_data;
 382
 383                                 /*
 384                                  * Allow the drive 5 seconds to recover, some
 385                                  * devices will return this error while flushing
 386                                  * data from cache.
 387                                  */
 388                                 if (!rq->errors)
 389                                         info->write_timeout = jiffies +
 390                                                         ATAPI_WAIT_WRITE_BUSY;
 391                                 rq->errors = 1;
 392                                 if (time_after(jiffies, info->write_timeout))
 393                                         do_end_request = 1;
 394                                 else {
 395                                         unsigned long flags;
 396
 397                                         /*
 398                                          * take a breather relying on the unplug
 399                                          * timer to kick us again
 400                                          */
 401                                         spin_lock_irqsave(&ide_lock, flags);
 402                                         blk_plug_device(drive->queue);
 403                                         spin_unlock_irqrestore(&ide_lock,
 404                                                                 flags);
 405                                         return 1;
 406                                 }
 407                         }
 408                 } else if (sense_key == UNIT_ATTENTION) {
 409                         /* media change */
 410                         cdrom_saw_media_change(drive);
 411
 412                         /*
 413                          * Arrange to retry the request but be sure to give up
 414                          * if we've retried too many times.
 415                          */
 416                         if (++rq->errors > ERROR_MAX)
 417                                 do_end_request = 1;
 418                 } else if (sense_key == ILLEGAL_REQUEST ||
 419                            sense_key == DATA_PROTECT) {
 420                         /*
 421                          * No point in retrying after an illegal request or data
 422                          * protect error.
 423                          */
 424                         ide_dump_status_no_sense(drive, "command error", stat);
 425                         do_end_request = 1;
 426                 } else if (sense_key == MEDIUM_ERROR) {
 427                         /*
 428                          * No point in re-trying a zillion times on a bad
 429                          * sector. If we got here the error is not correctable.
 430                          */
 431                         ide_dump_status_no_sense(drive,
 432                                                  "media error (bad sector)",
 433                                                  stat);
 434                         do_end_request = 1;
 435                 } else if (sense_key == BLANK_CHECK) {
 436                         /* disk appears blank ?? */
 437                         ide_dump_status_no_sense(drive, "media error (blank)",
 438                                                  stat);
 439                         do_end_request = 1;
 440                 } else if ((err & ~ABRT_ERR) != 0) {
 441                         /* go to the default handler for other errors */
 442                         ide_error(drive, "cdrom_decode_status", stat);
 443                         return 1;
 444                 } else if ((++rq->errors > ERROR_MAX)) {
 445                         /* we've racked up too many retries, abort */
 446                         do_end_request = 1;
 447                 }
 448
 449                 /*
 450                  * End a request through request sense analysis when we have
 451                  * sense data. We need this in order to perform end of media
 452                  * processing.
 453                  */
 454                 if (do_end_request)
 455                         goto end_request;
 456
 457                 /*
 458                  * If we got a CHECK_CONDITION status, queue
 459                  * a request sense command.
 460                  */
 461                 if (stat & ERR_STAT)
 462                         cdrom_queue_request_sense(drive, NULL, NULL);
 463         } else {
 464                 blk_dump_rq_flags(rq, "ide-cd: bad rq");
 465                 cdrom_end_request(drive, 0);
 466         }
 467
 468         /* retry, or handle the next request */
 469         return 1;
 470
 471 end_request:
 472         if (stat & ERR_STAT) {
 473                 unsigned long flags;
 474
 475                 spin_lock_irqsave(&ide_lock, flags);
 476                 blkdev_dequeue_request(rq);
 477                 HWGROUP(drive)->rq = NULL;
 478                 spin_unlock_irqrestore(&ide_lock, flags);
 479
 480                 cdrom_queue_request_sense(drive, rq->sense, rq);
 481         } else
 482                 cdrom_end_request(drive, 0);
 483
 484         return 1;
 485 }
 486
 487 static int cdrom_timer_expiry(ide_drive_t *drive)
 488 {
 489         struct request *rq = HWGROUP(drive)->rq;
 490         unsigned long wait = 0;
 491
 492         /*
 493          * Some commands are *slow* and normally take a long time to complete.
 494          * Usually we can use the ATAPI "disconnect" to bypass this, but not all
 495          * commands/drives support that. Let ide_timer_expiry keep polling us
 496          * for these.
 497          */
 498         switch (rq->cmd[0]) {
 499         case GPCMD_BLANK:
 500         case GPCMD_FORMAT_UNIT:
 501         case GPCMD_RESERVE_RZONE_TRACK:
 502         case GPCMD_CLOSE_TRACK:
 503         case GPCMD_FLUSH_CACHE:
 504                 wait = ATAPI_WAIT_PC;
 505                 break;
 506         default:
 507                 if (!(rq->cmd_flags & REQ_QUIET))
 508                         printk(KERN_INFO "ide-cd: cmd 0x%x timed out\n",
 509                                          rq->cmd[0]);
 510                 wait = 0;
 511                 break;
 512         }
 513         return wait;
 514 }
 515
 516 /*
 517  * Set up the device registers for transferring a packet command on DEV,
 518  * expecting to later transfer XFERLEN bytes.  HANDLER is the routine
 519  * which actually transfers the command to the drive.  If this is a
 520  * drq_interrupt device, this routine will arrange for HANDLER to be
 521  * called when the interrupt from the drive arrives.  Otherwise, HANDLER
 522  * will be called immediately after the drive is prepared for the transfer.
 523  */
 524 static ide_startstop_t cdrom_start_packet_command(ide_drive_t *drive,
 525                                                   int xferlen,
 526                                                   ide_handler_t *handler)
 527 {
 528         ide_startstop_t startstop;
 529         struct cdrom_info *info = drive->driver_data;
 530         ide_hwif_t *hwif = drive->hwif;
 531
 532         /* wait for the controller to be idle */
 533         if (ide_wait_stat(&startstop, drive, 0, BUSY_STAT, WAIT_READY))
 534                 return startstop;
 535
 536         /* FIXME: for Virtual DMA we must check harder */
 537         if (info->dma)
 538                 info->dma = !hwif->dma_ops->dma_setup(drive);
 539
 540         /* set up the controller registers */
 541         ide_pktcmd_tf_load(drive, IDE_TFLAG_OUT_NSECT | IDE_TFLAG_OUT_LBAL |
 542                            IDE_TFLAG_NO_SELECT_MASK, xferlen, info->dma);
 543
 544         if (info->cd_flags & IDE_CD_FLAG_DRQ_INTERRUPT) {
 545                 /* waiting for CDB interrupt, not DMA yet. */
 546                 if (info->dma)
 547                         drive->waiting_for_dma = 0;
 548
 549                 /* packet command */
 550                 ide_execute_command(drive, WIN_PACKETCMD, handler,
 551                                     ATAPI_WAIT_PC, cdrom_timer_expiry);
 552                 return ide_started;
 553         } else {
 554                 ide_execute_pkt_cmd(drive);
 555
 556                 return (*handler) (drive);
 557         }
 558 }
 559
 560 /*
 561  * Send a packet command to DRIVE described by CMD_BUF and CMD_LEN. The device
 562  * registers must have already been prepared by cdrom_start_packet_command.
 563  * HANDLER is the interrupt handler to call when the command completes or
 564  * there's data ready.
 565  */
 566 #define ATAPI_MIN_CDB_BYTES 12
 567 static ide_startstop_t cdrom_transfer_packet_command(ide_drive_t *drive,
 568                                           struct request *rq,
 569                                           ide_handler_t *handler)
 570 {
 571         ide_hwif_t *hwif = drive->hwif;
 572         int cmd_len;
 573         struct cdrom_info *info = drive->driver_data;
 574         ide_startstop_t startstop;
 575
 576         if (info->cd_flags & IDE_CD_FLAG_DRQ_INTERRUPT) {
 577                 /*
 578                  * Here we should have been called after receiving an interrupt
 579                  * from the device.  DRQ should how be set.
 580                  */
 581
 582                 /* check for errors */
 583                 if (cdrom_decode_status(drive, DRQ_STAT, NULL))
 584                         return ide_stopped;
 585
 586                 /* ok, next interrupt will be DMA interrupt */
 587                 if (info->dma)
 588                         drive->waiting_for_dma = 1;
 589         } else {
 590                 /* otherwise, we must wait for DRQ to get set */
 591                 if (ide_wait_stat(&startstop, drive, DRQ_STAT,
 592                                 BUSY_STAT, WAIT_READY))
 593                         return startstop;
 594         }
 595
 596         /* arm the interrupt handler */
 597         ide_set_handler(drive, handler, rq->timeout, cdrom_timer_expiry);
 598
 599         /* ATAPI commands get padded out to 12 bytes minimum */
 600         cmd_len = COMMAND_SIZE(rq->cmd[0]);
 601         if (cmd_len < ATAPI_MIN_CDB_BYTES)
 602                 cmd_len = ATAPI_MIN_CDB_BYTES;
 603
 604         /* send the command to the device */
 605         hwif->output_data(drive, NULL, rq->cmd, cmd_len);
 606
 607         /* start the DMA if need be */
 608         if (info->dma)
 609                 hwif->dma_ops->dma_start(drive);
 610
 611         return ide_started;
 612 }
 613
 614 /*
 615  * Block read functions.
 616  */
 617 static void ide_cd_pad_transfer(ide_drive_t *drive, xfer_func_t *xf, int len)
 618 {
 619         while (len > 0) {
 620                 int dum = 0;
 621                 xf(drive, NULL, &dum, sizeof(dum));
 622                 len -= sizeof(dum);
 623         }
 624 }
 625
 626 static void ide_cd_drain_data(ide_drive_t *drive, int nsects)
 627 {
 628         while (nsects > 0) {
 629                 static char dum[SECTOR_SIZE];
 630
 631                 drive->hwif->input_data(drive, NULL, dum, sizeof(dum));
 632                 nsects--;
 633         }
 634 }
 635
 636 /*
 637  * Check the contents of the interrupt reason register from the cdrom
 638  * and attempt to recover if there are problems.  Returns  0 if everything's
 639  * ok; nonzero if the request has been terminated.
 640  */
 641 static int ide_cd_check_ireason(ide_drive_t *drive, struct request *rq,
 642                                 int len, int ireason, int rw)
 643 {
 644         /*
 645          * ireason == 0: the drive wants to receive data from us
 646          * ireason == 2: the drive is expecting to transfer data to us
 647          */
 648         if (ireason == (!rw << 1))
 649                 return 0;
 650         else if (ireason == (rw << 1)) {
 651                 ide_hwif_t *hwif = drive->hwif;
 652                 xfer_func_t *xf;
 653
 654                 /* whoops... */
 655                 printk(KERN_ERR "%s: %s: wrong transfer direction!\n",
 656                                 drive->name, __func__);
 657
 658                 xf = rw ? hwif->output_data : hwif->input_data;
 659                 ide_cd_pad_transfer(drive, xf, len);
 660         } else  if (rw == 0 && ireason == 1) {
 661                 /*
 662                  * Some drives (ASUS) seem to tell us that status info is
 663                  * available.  Just get it and ignore.
 664                  */
 665                 (void)ide_read_status(drive);
 666                 return 0;
 667         } else {
 668                 /* drive wants a command packet, or invalid ireason... */
 669                 printk(KERN_ERR "%s: %s: bad interrupt reason 0x%02x\n",
 670                                 drive->name, __func__, ireason);
 671         }
 672
 673         if (rq->cmd_type == REQ_TYPE_ATA_PC)
 674                 rq->cmd_flags |= REQ_FAILED;
 675
 676         cdrom_end_request(drive, 0);
 677         return -1;
 678 }
 679
 680 /*
 681  * Assume that the drive will always provide data in multiples of at least
 682  * SECTOR_SIZE, as it gets hairy to keep track of the transfers otherwise.
 683  */
 684 static int ide_cd_check_transfer_size(ide_drive_t *drive, int len)
 685 {
 686         struct cdrom_info *cd = drive->driver_data;
 687
 688         if ((len % SECTOR_SIZE) == 0)
 689                 return 0;
 690
 691         printk(KERN_ERR "%s: %s: Bad transfer size %d\n",
 692                         drive->name, __func__, len);
 693
 694         if (cd->cd_flags & IDE_CD_FLAG_LIMIT_NFRAMES)
 695                 printk(KERN_ERR "  This drive is not supported by "
 696                                 "this version of the driver\n");
 697         else {
 698                 printk(KERN_ERR "  Trying to limit transfer sizes\n");
 699                 cd->cd_flags |= IDE_CD_FLAG_LIMIT_NFRAMES;
 700         }
 701
 702         return 1;
 703 }
 704
 705 static ide_startstop_t cdrom_newpc_intr(ide_drive_t *);
 706
 707 /*
 708  * Routine to send a read/write packet command to the drive. This is usually
 709  * called directly from cdrom_start_{read,write}(). However, for drq_interrupt
 710  * devices, it is called from an interrupt when the drive is ready to accept
 711  * the command.
 712  */
 713 static ide_startstop_t cdrom_start_rw_cont(ide_drive_t *drive)
 714 {
 715         struct request *rq = HWGROUP(drive)->rq;
 716
 717         if (rq_data_dir(rq) == READ) {
 718                 unsigned short sectors_per_frame =
 719                         queue_hardsect_size(drive->queue) >> SECTOR_BITS;
 720                 int nskip = rq->sector & (sectors_per_frame - 1);
 721
 722                 /*
 723                  * If the requested sector doesn't start on a frame boundary,
 724                  * we must adjust the start of the transfer so that it does,
 725                  * and remember to skip the first few sectors.
 726                  *
 727                  * If the rq->current_nr_sectors field is larger than the size
 728                  * of the buffer, it will mean that we're to skip a number of
 729                  * sectors equal to the amount by which rq->current_nr_sectors
 730                  * is larger than the buffer size.
 731                  */
 732                 if (nskip > 0) {
 733                         /* sanity check... */
 734                         if (rq->current_nr_sectors !=
 735                             bio_cur_sectors(rq->bio)) {
 736                                 printk(KERN_ERR "%s: %s: buffer botch (%u)\n",
 737                                                 drive->name, __func__,
 738                                                 rq->current_nr_sectors);
 739                                 cdrom_end_request(drive, 0);
 740                                 return ide_stopped;
 741                         }
 742                         rq->current_nr_sectors += nskip;
 743                 }
 744         }
 745 #if 0
 746         else
 747                 /* the immediate bit */
 748                 rq->cmd[1] = 1 << 3;
 749 #endif
 750         /* set up the command */
 751         rq->timeout = ATAPI_WAIT_PC;
 752
 753         /* send the command to the drive and return */
 754         return cdrom_transfer_packet_command(drive, rq, cdrom_newpc_intr);
 755 }
 756
 757 #define IDECD_SEEK_THRESHOLD    (1000)                  /* 1000 blocks */
 758 #define IDECD_SEEK_TIMER        (5 * WAIT_MIN_SLEEP)    /* 100 ms */
 759 #define IDECD_SEEK_TIMEOUT      (2 * WAIT_CMD)          /* 20 sec */
 760
 761 static ide_startstop_t cdrom_seek_intr(ide_drive_t *drive)
 762 {
 763         struct cdrom_info *info = drive->driver_data;
 764         int stat;
 765         static int retry = 10;
 766
 767         if (cdrom_decode_status(drive, 0, &stat))
 768                 return ide_stopped;
 769
 770         info->cd_flags |= IDE_CD_FLAG_SEEKING;
 771
 772         if (retry && time_after(jiffies, info->start_seek + IDECD_SEEK_TIMER)) {
 773                 if (--retry == 0)
 774                         drive->dsc_overlap = 0;
 775         }
 776         return ide_stopped;
 777 }
 778
 779 static ide_startstop_t cdrom_start_seek_continuation(ide_drive_t *drive)
 780 {
 781         struct request *rq = HWGROUP(drive)->rq;
 782         sector_t frame = rq->sector;
 783
 784         sector_div(frame, queue_hardsect_size(drive->queue) >> SECTOR_BITS);
 785
 786         memset(rq->cmd, 0, BLK_MAX_CDB);
 787         rq->cmd[0] = GPCMD_SEEK;
 788         put_unaligned(cpu_to_be32(frame), (unsigned int *) &rq->cmd[2]);
 789
 790         rq->timeout = ATAPI_WAIT_PC;
 791         return cdrom_transfer_packet_command(drive, rq, &cdrom_seek_intr);
 792 }
 793
 794 static ide_startstop_t cdrom_start_seek(ide_drive_t *drive, unsigned int block)
 795 {
 796         struct cdrom_info *info = drive->driver_data;
 797
 798         info->dma = 0;
 799         info->start_seek = jiffies;
 800         return cdrom_start_packet_command(drive, 0,
 801                                           cdrom_start_seek_continuation);
 802 }
 803
 804 /*
 805  * Fix up a possibly partially-processed request so that we can start it over
 806  * entirely, or even put it back on the request queue.
 807  */
 808 static void restore_request(struct request *rq)
 809 {
 810         if (rq->buffer != bio_data(rq->bio)) {
 811                 sector_t n =
 812                         (rq->buffer - (char *)bio_data(rq->bio)) / SECTOR_SIZE;
 813
 814                 rq->buffer = bio_data(rq->bio);
 815                 rq->nr_sectors += n;
 816                 rq->sector -= n;
 817         }
 818         rq->current_nr_sectors = bio_cur_sectors(rq->bio);
 819         rq->hard_cur_sectors = rq->current_nr_sectors;
 820         rq->hard_nr_sectors = rq->nr_sectors;
 821         rq->hard_sector = rq->sector;
 822         rq->q->prep_rq_fn(rq->q, rq);
 823 }
 824
 825 /*
 826  * All other packet commands.
 827  */
 828 static void ide_cd_request_sense_fixup(struct request *rq)
 829 {
 830         /*
 831          * Some of the trailing request sense fields are optional,
 832          * and some drives don't send them.  Sigh.
 833          */
 834         if (rq->cmd[0] == GPCMD_REQUEST_SENSE &&
 835             rq->data_len > 0 && rq->data_len <= 5)
 836                 while (rq->data_len > 0) {
 837                         *(u8 *)rq->data++ = 0;
 838                         --rq->data_len;
 839                 }
 840 }
 841
 842 int ide_cd_queue_pc(ide_drive_t *drive, struct request *rq)
 843 {
 844         struct request_sense sense;
 845         int retries = 10;
 846         unsigned int flags = rq->cmd_flags;
 847
 848         if (rq->sense == NULL)
 849                 rq->sense = &sense;
 850
 851         /* start of retry loop */
 852         do {
 853                 int error;
 854                 unsigned long time = jiffies;
 855                 rq->cmd_flags = flags;
 856
 857                 error = ide_do_drive_cmd(drive, rq, ide_wait);
 858                 time = jiffies - time;
 859
 860                 /*
 861                  * FIXME: we should probably abort/retry or something in case of
 862                  * failure.
 863                  */
 864                 if (rq->cmd_flags & REQ_FAILED) {
 865                         /*
 866                          * The request failed.  Retry if it was due to a unit
 867                          * attention status (usually means media was changed).
 868                          */
 869                         struct request_sense *reqbuf = rq->sense;
 870
 871                         if (reqbuf->sense_key == UNIT_ATTENTION)
 872                                 cdrom_saw_media_change(drive);
 873                         else if (reqbuf->sense_key == NOT_READY &&
 874                                  reqbuf->asc == 4 && reqbuf->ascq != 4) {
 875                                 /*
 876                                  * The drive is in the process of loading
 877                                  * a disk.  Retry, but wait a little to give
 878                                  * the drive time to complete the load.
 879                                  */
 880                                 ssleep(2);
 881                         } else {
 882                                 /* otherwise, don't retry */
 883                                 retries = 0;
 884                         }
 885                         --retries;
 886                 }
 887
 888                 /* end of retry loop */
 889         } while ((rq->cmd_flags & REQ_FAILED) && retries >= 0);
 890
 891         /* return an error if the command failed */
 892         return (rq->cmd_flags & REQ_FAILED) ? -EIO : 0;
 893 }
 894
 895 /*
 896  * Called from blk_end_request_callback() after the data of the request is
 897  * completed and before the request itself is completed. By returning value '1',
 898  * blk_end_request_callback() returns immediately without completing it.
 899  */
 900 static int cdrom_newpc_intr_dummy_cb(struct request *rq)
 901 {
 902         return 1;
 903 }
 904
 905 static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
 906 {
 907         ide_hwif_t *hwif = drive->hwif;
 908         struct cdrom_info *info = drive->driver_data;
 909         struct request *rq = HWGROUP(drive)->rq;
 910         xfer_func_t *xferfunc;
 911         ide_expiry_t *expiry = NULL;
 912         int dma_error = 0, dma, stat, ireason, len, thislen, uptodate = 0;
 913         int write = (rq_data_dir(rq) == WRITE) ? 1 : 0;
 914         unsigned int timeout;
 915         u8 lowcyl, highcyl;
 916
 917         /* check for errors */
 918         dma = info->dma;
 919         if (dma) {
 920                 info->dma = 0;
 921                 dma_error = hwif->dma_ops->dma_end(drive);
 922                 if (dma_error) {
 923                         printk(KERN_ERR "%s: DMA %s error\n", drive->name,
 924                                         write ? "write" : "read");
 925                         ide_dma_off(drive);
 926                 }
 927         }
 928
 929         if (cdrom_decode_status(drive, 0, &stat))
 930                 return ide_stopped;
 931
 932         /* using dma, transfer is complete now */
 933         if (dma) {
 934                 if (dma_error)
 935                         return ide_error(drive, "dma error", stat);
 936                 if (blk_fs_request(rq)) {
 937                         ide_end_request(drive, 1, rq->nr_sectors);
 938                         return ide_stopped;
 939                 }
 940                 goto end_request;
 941         }
 942
 943         /* ok we fall to pio :/ */
 944         ireason = hwif->INB(hwif->io_ports.nsect_addr) & 0x3;
 945         lowcyl  = hwif->INB(hwif->io_ports.lbam_addr);
 946         highcyl = hwif->INB(hwif->io_ports.lbah_addr);
 947
 948         len = lowcyl + (256 * highcyl);
 949
 950         thislen = blk_fs_request(rq) ? len : rq->data_len;
 951         if (thislen > len)
 952                 thislen = len;
 953
 954         /* If DRQ is clear, the command has completed. */
 955         if ((stat & DRQ_STAT) == 0) {
 956                 if (blk_fs_request(rq)) {
 957                         /*
 958                          * If we're not done reading/writing, complain.
 959                          * Otherwise, complete the command normally.
 960                          */
 961                         uptodate = 1;
 962                         if (rq->current_nr_sectors > 0) {
 963                                 printk(KERN_ERR "%s: %s: data underrun "
 964                                                 "(%d blocks)\n",
 965                                                 drive->name, __func__,
 966                                                 rq->current_nr_sectors);
 967                                 if (!write)
 968                                         rq->cmd_flags |= REQ_FAILED;
 969                                 uptodate = 0;
 970                         }
 971                         cdrom_end_request(drive, uptodate);
 972                         return ide_stopped;
 973                 } else if (!blk_pc_request(rq)) {
 974                         ide_cd_request_sense_fixup(rq);
 975                         /* complain if we still have data left to transfer */
 976                         uptodate = rq->data_len ? 0 : 1;
 977                 }
 978                 goto end_request;
 979         }
 980
 981         /* check which way to transfer data */
 982         if (ide_cd_check_ireason(drive, rq, len, ireason, write))
 983                 return ide_stopped;
 984
 985         if (blk_fs_request(rq)) {
 986                 if (write == 0) {
 987                         int nskip;
 988
 989                         if (ide_cd_check_transfer_size(drive, len)) {
 990                                 cdrom_end_request(drive, 0);
 991                                 return ide_stopped;
 992                         }
 993
 994                         /*
 995                          * First, figure out if we need to bit-bucket
 996                          * any of the leading sectors.
 997                          */
 998                         nskip = min_t(int, rq->current_nr_sectors
 999                                            - bio_cur_sectors(rq->bio),
1000                                            thislen >> 9);
1001                         if (nskip > 0) {
1002                                 ide_cd_drain_data(drive, nskip);
1003                                 rq->current_nr_sectors -= nskip;
1004                                 thislen -= (nskip << 9);
1005                         }
1006                 }
1007         }
1008
1009         if (ireason == 0) {
1010                 write = 1;
1011                 xferfunc = hwif->output_data;
1012         } else {
1013                 write = 0;
1014                 xferfunc = hwif->input_data;
1015         }
1016
1017         /* transfer data */
1018         while (thislen > 0) {
1019                 u8 *ptr = blk_fs_request(rq) ? NULL : rq->data;
1020                 int blen = rq->data_len;
1021
1022                 /* bio backed? */
1023                 if (rq->bio) {
1024                         if (blk_fs_request(rq)) {
1025                                 ptr = rq->buffer;
1026                                 blen = rq->current_nr_sectors << 9;
1027                         } else {
1028                                 ptr = bio_data(rq->bio);
1029                                 blen = bio_iovec(rq->bio)->bv_len;
1030                         }
1031                 }
1032
1033                 if (!ptr) {
1034                         if (blk_fs_request(rq) && !write)
1035                                 /*
1036                                  * If the buffers are full, pipe the rest into
1037                                  * oblivion.
1038                                  */
1039                                 ide_cd_drain_data(drive, thislen >> 9);
1040                         else {
1041                                 printk(KERN_ERR "%s: confused, missing data\n",
1042                                                 drive->name);
1043                                 blk_dump_rq_flags(rq, rq_data_dir(rq)
1044                                                   ? "cdrom_newpc_intr, write"
1045                                                   : "cdrom_newpc_intr, read");
1046                         }
1047                         break;
1048                 }
1049
1050                 if (blen > thislen)
1051                         blen = thislen;
1052
1053                 xferfunc(drive, NULL, ptr, blen);
1054
1055                 thislen -= blen;
1056                 len -= blen;
1057
1058                 if (blk_fs_request(rq)) {
1059                         rq->buffer += blen;
1060                         rq->nr_sectors -= (blen >> 9);
1061                         rq->current_nr_sectors -= (blen >> 9);
1062                         rq->sector += (blen >> 9);
1063
1064                         if (rq->current_nr_sectors == 0 && rq->nr_sectors)
1065                                 cdrom_end_request(drive, 1);
1066                 } else {
1067                         rq->data_len -= blen;
1068
1069                         /*
1070                          * The request can't be completed until DRQ is cleared.
1071                          * So complete the data, but don't complete the request
1072                          * using the dummy function for the callback feature
1073                          * of blk_end_request_callback().
1074                          */
1075                         if (rq->bio)
1076                                 blk_end_request_callback(rq, 0, blen,
1077                                                  cdrom_newpc_intr_dummy_cb);
1078                         else
1079                                 rq->data += blen;
1080                 }
1081                 if (!write && blk_sense_request(rq))
1082                         rq->sense_len += blen;
1083         }
1084
1085         /* pad, if necessary */
1086         if (!blk_fs_request(rq) && len > 0)
1087                 ide_cd_pad_transfer(drive, xferfunc, len);
1088
1089         if (blk_pc_request(rq)) {
1090                 timeout = rq->timeout;
1091         } else {
1092                 timeout = ATAPI_WAIT_PC;
1093                 if (!blk_fs_request(rq))
1094                         expiry = cdrom_timer_expiry;
1095         }
1096
1097         ide_set_handler(drive, cdrom_newpc_intr, timeout, expiry);
1098         return ide_started;
1099
1100 end_request:
1101         if (blk_pc_request(rq)) {
1102                 unsigned long flags;
1103                 unsigned int dlen = rq->data_len;
1104
1105                 if (dma)
1106                         rq->data_len = 0;
1107
1108                 spin_lock_irqsave(&ide_lock, flags);
1109                 if (__blk_end_request(rq, 0, dlen))
1110                         BUG();
1111                 HWGROUP(drive)->rq = NULL;
1112                 spin_unlock_irqrestore(&ide_lock, flags);
1113         } else {
1114                 if (!uptodate)
1115                         rq->cmd_flags |= REQ_FAILED;
1116                 cdrom_end_request(drive, uptodate);
1117         }
1118         return ide_stopped;
1119 }
1120
1121 static ide_startstop_t cdrom_start_rw(ide_drive_t *drive, struct request *rq)
1122 {
1123         struct cdrom_info *cd = drive->driver_data;
1124         int write = rq_data_dir(rq) == WRITE;
1125         unsigned short sectors_per_frame =
1126                 queue_hardsect_size(drive->queue) >> SECTOR_BITS;
1127
1128         if (write) {
1129                 /* disk has become write protected */
1130                 if (cd->disk->policy) {
1131                         cdrom_end_request(drive, 0);
1132                         return ide_stopped;
1133                 }
1134         } else {
1135                 /*
1136                  * We may be retrying this request after an error.  Fix up any
1137                  * weirdness which might be present in the request packet.
1138                  */
1139                 restore_request(rq);
1140         }
1141
1142         /* use DMA, if possible / writes *must* be hardware frame aligned */
1143         if ((rq->nr_sectors & (sectors_per_frame - 1)) ||
1144             (rq->sector & (sectors_per_frame - 1))) {
1145                 if (write) {
1146                         cdrom_end_request(drive, 0);
1147                         return ide_stopped;
1148                 }
1149                 cd->dma = 0;
1150         } else
1151                 cd->dma = drive->using_dma;
1152
1153         if (write)
1154                 cd->devinfo.media_written = 1;
1155
1156         /* start sending the read/write request to the drive */
1157         return cdrom_start_packet_command(drive, 32768, cdrom_start_rw_cont);
1158 }
1159
1160 static ide_startstop_t cdrom_do_newpc_cont(ide_drive_t *drive)
1161 {
1162         struct request *rq = HWGROUP(drive)->rq;
1163
1164         if (!rq->timeout)
1165                 rq->timeout = ATAPI_WAIT_PC;
1166
1167         return cdrom_transfer_packet_command(drive, rq, cdrom_newpc_intr);
1168 }
1169
1170 static ide_startstop_t cdrom_do_block_pc(ide_drive_t *drive, struct request *rq)
1171 {
1172         struct cdrom_info *info = drive->driver_data;
1173
1174         if (blk_pc_request(rq))
1175                 rq->cmd_flags |= REQ_QUIET;
1176         else
1177                 rq->cmd_flags &= ~REQ_FAILED;
1178
1179         info->dma = 0;
1180
1181         /* sg request */
1182         if (rq->bio) {
1183                 int mask = drive->queue->dma_alignment;
1184                 unsigned long addr =
1185                         (unsigned long)page_address(bio_page(rq->bio));
1186
1187                 info->dma = drive->using_dma;
1188
1189                 /*
1190                  * check if dma is safe
1191                  *
1192                  * NOTE! The "len" and "addr" checks should possibly have
1193                  * separate masks.
1194                  */
1195                 if ((rq->data_len & 15) || (addr & mask))
1196                         info->dma = 0;
1197         }
1198
1199         /* start sending the command to the drive */
1200         return cdrom_start_packet_command(drive, rq->data_len,
1201                                           cdrom_do_newpc_cont);
1202 }
1203
1204 /*
1205  * cdrom driver request routine.
1206  */
1207 static ide_startstop_t ide_do_rw_cdrom(ide_drive_t *drive, struct request *rq,
1208                                         sector_t block)
1209 {
1210         ide_startstop_t action;
1211         struct cdrom_info *info = drive->driver_data;
1212
1213         if (blk_fs_request(rq)) {
1214                 if (info->cd_flags & IDE_CD_FLAG_SEEKING) {
1215                         unsigned long elapsed = jiffies - info->start_seek;
1216                         int stat = ide_read_status(drive);
1217
1218                         if ((stat & SEEK_STAT) != SEEK_STAT) {
1219                                 if (elapsed < IDECD_SEEK_TIMEOUT) {
1220                                         ide_stall_queue(drive,
1221                                                         IDECD_SEEK_TIMER);
1222                                         return ide_stopped;
1223                                 }
1224                                 printk(KERN_ERR "%s: DSC timeout\n",
1225                                                 drive->name);
1226                         }
1227                         info->cd_flags &= ~IDE_CD_FLAG_SEEKING;
1228                 }
1229                 if (rq_data_dir(rq) == READ &&
1230                     IDE_LARGE_SEEK(info->last_block, block,
1231                                    IDECD_SEEK_THRESHOLD) &&
1232                     drive->dsc_overlap)
1233                         action = cdrom_start_seek(drive, block);
1234                 else
1235                         action = cdrom_start_rw(drive, rq);
1236                 info->last_block = block;
1237                 return action;
1238         } else if (blk_sense_request(rq) || blk_pc_request(rq) ||
1239                    rq->cmd_type == REQ_TYPE_ATA_PC) {
1240                 return cdrom_do_block_pc(drive, rq);
1241         } else if (blk_special_request(rq)) {
1242                 /* right now this can only be a reset... */
1243                 cdrom_end_request(drive, 1);
1244                 return ide_stopped;
1245         }
1246
1247         blk_dump_rq_flags(rq, "ide-cd bad flags");
1248         cdrom_end_request(drive, 0);
1249         return ide_stopped;
1250 }
1251
1252
1253
1254 /*
1255  * Ioctl handling.
1256  *
1257  * Routines which queue packet commands take as a final argument a pointer to a
1258  * request_sense struct. If execution of the command results in an error with a
1259  * CHECK CONDITION status, this structure will be filled with the results of the
1260  * subsequent request sense command. The pointer can also be NULL, in which case
1261  * no sense information is returned.
1262  */
1263 static void msf_from_bcd(struct atapi_msf *msf)
1264 {
1265         msf->minute = BCD2BIN(msf->minute);
1266         msf->second = BCD2BIN(msf->second);
1267         msf->frame  = BCD2BIN(msf->frame);
1268 }
1269
1270 int cdrom_check_status(ide_drive_t *drive, struct request_sense *sense)
1271 {
1272         struct request req;
1273         struct cdrom_info *info = drive->driver_data;
1274         struct cdrom_device_info *cdi = &info->devinfo;
1275
1276         ide_cd_init_rq(drive, &req);
1277
1278         req.sense = sense;
1279         req.cmd[0] = GPCMD_TEST_UNIT_READY;
1280         req.cmd_flags |= REQ_QUIET;
1281
1282         /*
1283          * Sanyo 3 CD changer uses byte 7 of TEST_UNIT_READY to switch CDs
1284          * instead of supporting the LOAD_UNLOAD opcode.
1285          */
1286         req.cmd[7] = cdi->sanyo_slot % 3;
1287
1288         return ide_cd_queue_pc(drive, &req);
1289 }
1290
1291 static int cdrom_read_capacity(ide_drive_t *drive, unsigned long *capacity,
1292                                unsigned long *sectors_per_frame,
1293                                struct request_sense *sense)
1294 {
1295         struct {
1296                 __u32 lba;
1297                 __u32 blocklen;
1298         } capbuf;
1299
1300         int stat;
1301         struct request req;
1302
1303         ide_cd_init_rq(drive, &req);
1304
1305         req.sense = sense;
1306         req.cmd[0] = GPCMD_READ_CDVD_CAPACITY;
1307         req.data = (char *)&capbuf;
1308         req.data_len = sizeof(capbuf);
1309         req.cmd_flags |= REQ_QUIET;
1310
1311         stat = ide_cd_queue_pc(drive, &req);
1312         if (stat == 0) {
1313                 *capacity = 1 + be32_to_cpu(capbuf.lba);
1314                 *sectors_per_frame =
1315                         be32_to_cpu(capbuf.blocklen) >> SECTOR_BITS;
1316         }
1317
1318         return stat;
1319 }
1320
1321 static int cdrom_read_tocentry(ide_drive_t *drive, int trackno, int msf_flag,
1322                                 int format, char *buf, int buflen,
1323                                 struct request_sense *sense)
1324 {
1325         struct request req;
1326
1327         ide_cd_init_rq(drive, &req);
1328
1329         req.sense = sense;
1330         req.data =  buf;
1331         req.data_len = buflen;
1332         req.cmd_flags |= REQ_QUIET;
1333         req.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
1334         req.cmd[6] = trackno;
1335         req.cmd[7] = (buflen >> 8);
1336         req.cmd[8] = (buflen & 0xff);
1337         req.cmd[9] = (format << 6);
1338
1339         if (msf_flag)
1340                 req.cmd[1] = 2;
1341
1342         return ide_cd_queue_pc(drive, &req);
1343 }
1344
1345 /* Try to read the entire TOC for the disk into our internal buffer. */
1346 int ide_cd_read_toc(ide_drive_t *drive, struct request_sense *sense)
1347 {
1348         int stat, ntracks, i;
1349         struct cdrom_info *info = drive->driver_data;
1350         struct cdrom_device_info *cdi = &info->devinfo;
1351         struct atapi_toc *toc = info->toc;
1352         struct {
1353                 struct atapi_toc_header hdr;
1354                 struct atapi_toc_entry  ent;
1355         } ms_tmp;
1356         long last_written;
1357         unsigned long sectors_per_frame = SECTORS_PER_FRAME;
1358
1359         if (toc == NULL) {
1360                 /* try to allocate space */
1361                 toc = kmalloc(sizeof(struct atapi_toc), GFP_KERNEL);
1362                 if (toc == NULL) {
1363                         printk(KERN_ERR "%s: No cdrom TOC buffer!\n",
1364                                         drive->name);
1365                         return -ENOMEM;
1366                 }
1367                 info->toc = toc;
1368         }
1369
1370         /*
1371          * Check to see if the existing data is still valid. If it is,
1372          * just return.
1373          */
1374         (void) cdrom_check_status(drive, sense);
1375
1376         if (info->cd_flags & IDE_CD_FLAG_TOC_VALID)
1377                 return 0;
1378
1379         /* try to get the total cdrom capacity and sector size */
1380         stat = cdrom_read_capacity(drive, &toc->capacity, &sectors_per_frame,
1381                                    sense);
1382         if (stat)
1383                 toc->capacity = 0x1fffff;
1384
1385         set_capacity(info->disk, toc->capacity * sectors_per_frame);
1386         /* save a private copy of the TOC capacity for error handling */
1387         drive->probed_capacity = toc->capacity * sectors_per_frame;
1388
1389         blk_queue_hardsect_size(drive->queue,
1390                                 sectors_per_frame << SECTOR_BITS);
1391
1392         /* first read just the header, so we know how long the TOC is */
1393         stat = cdrom_read_tocentry(drive, 0, 1, 0, (char *) &toc->hdr,
1394                                     sizeof(struct atapi_toc_header), sense);
1395         if (stat)
1396                 return stat;
1397
1398         if (info->cd_flags & IDE_CD_FLAG_TOCTRACKS_AS_BCD) {
1399                 toc->hdr.first_track = BCD2BIN(toc->hdr.first_track);
1400                 toc->hdr.last_track  = BCD2BIN(toc->hdr.last_track);
1401         }
1402
1403         ntracks = toc->hdr.last_track - toc->hdr.first_track + 1;
1404         if (ntracks <= 0)
1405                 return -EIO;
1406         if (ntracks > MAX_TRACKS)
1407                 ntracks = MAX_TRACKS;
1408
1409         /* now read the whole schmeer */
1410         stat = cdrom_read_tocentry(drive, toc->hdr.first_track, 1, 0,
1411                                   (char *)&toc->hdr,
1412                                    sizeof(struct atapi_toc_header) +
1413                                    (ntracks + 1) *
1414                                    sizeof(struct atapi_toc_entry), sense);
1415
1416         if (stat && toc->hdr.first_track > 1) {
1417                 /*
1418                  * Cds with CDI tracks only don't have any TOC entries, despite
1419                  * of this the returned values are
1420                  * first_track == last_track = number of CDI tracks + 1,
1421                  * so that this case is indistinguishable from the same layout
1422                  * plus an additional audio track. If we get an error for the
1423                  * regular case, we assume a CDI without additional audio
1424                  * tracks. In this case the readable TOC is empty (CDI tracks
1425                  * are not included) and only holds the Leadout entry.
1426                  *
1427                  * Heiko Eißfeldt.
1428                  */
1429                 ntracks = 0;
1430                 stat = cdrom_read_tocentry(drive, CDROM_LEADOUT, 1, 0,
1431                                            (char *)&toc->hdr,
1432                                            sizeof(struct atapi_toc_header) +
1433                                            (ntracks + 1) *
1434                                            sizeof(struct atapi_toc_entry),
1435                                            sense);
1436                 if (stat)
1437                         return stat;
1438
1439                 if (info->cd_flags & IDE_CD_FLAG_TOCTRACKS_AS_BCD) {
1440                         toc->hdr.first_track = (u8)BIN2BCD(CDROM_LEADOUT);
1441                         toc->hdr.last_track = (u8)BIN2BCD(CDROM_LEADOUT);
1442                 } else {
1443                         toc->hdr.first_track = CDROM_LEADOUT;
1444                         toc->hdr.last_track = CDROM_LEADOUT;
1445                 }
1446         }
1447
1448         if (stat)
1449                 return stat;
1450
1451         toc->hdr.toc_length = be16_to_cpu(toc->hdr.toc_length);
1452
1453         if (info->cd_flags & IDE_CD_FLAG_TOCTRACKS_AS_BCD) {
1454                 toc->hdr.first_track = BCD2BIN(toc->hdr.first_track);
1455                 toc->hdr.last_track  = BCD2BIN(toc->hdr.last_track);
1456         }
1457
1458         for (i = 0; i <= ntracks; i++) {
1459                 if (info->cd_flags & IDE_CD_FLAG_TOCADDR_AS_BCD) {
1460                         if (info->cd_flags & IDE_CD_FLAG_TOCTRACKS_AS_BCD)
1461                                 toc->ent[i].track = BCD2BIN(toc->ent[i].track);
1462                         msf_from_bcd(&toc->ent[i].addr.msf);
1463                 }
1464                 toc->ent[i].addr.lba = msf_to_lba(toc->ent[i].addr.msf.minute,
1465                                                   toc->ent[i].addr.msf.second,
1466                                                   toc->ent[i].addr.msf.frame);
1467         }
1468
1469         if (toc->hdr.first_track != CDROM_LEADOUT) {
1470                 /* read the multisession information */
1471                 stat = cdrom_read_tocentry(drive, 0, 0, 1, (char *)&ms_tmp,
1472                                            sizeof(ms_tmp), sense);
1473                 if (stat)
1474                         return stat;
1475
1476                 toc->last_session_lba = be32_to_cpu(ms_tmp.ent.addr.lba);
1477         } else {
1478                 ms_tmp.hdr.last_track = CDROM_LEADOUT;
1479                 ms_tmp.hdr.first_track = ms_tmp.hdr.last_track;
1480                 toc->last_session_lba = msf_to_lba(0, 2, 0); /* 0m 2s 0f */
1481         }
1482
1483         if (info->cd_flags & IDE_CD_FLAG_TOCADDR_AS_BCD) {
1484                 /* re-read multisession information using MSF format */
1485                 stat = cdrom_read_tocentry(drive, 0, 1, 1, (char *)&ms_tmp,
1486                                            sizeof(ms_tmp), sense);
1487                 if (stat)
1488                         return stat;
1489
1490                 msf_from_bcd(&ms_tmp.ent.addr.msf);
1491                 toc->last_session_lba = msf_to_lba(ms_tmp.ent.addr.msf.minute,
1492                                                    ms_tmp.ent.addr.msf.second,
1493                                                    ms_tmp.ent.addr.msf.frame);
1494         }
1495
1496         toc->xa_flag = (ms_tmp.hdr.first_track != ms_tmp.hdr.last_track);
1497
1498         /* now try to get the total cdrom capacity */
1499         stat = cdrom_get_last_written(cdi, &last_written);
1500         if (!stat && (last_written > toc->capacity)) {
1501                 toc->capacity = last_written;
1502                 set_capacity(info->disk, toc->capacity * sectors_per_frame);
1503                 drive->probed_capacity = toc->capacity * sectors_per_frame;
1504         }
1505
1506         /* Remember that we've read this stuff. */
1507         info->cd_flags |= IDE_CD_FLAG_TOC_VALID;
1508
1509         return 0;
1510 }
1511
1512 int ide_cdrom_get_capabilities(ide_drive_t *drive, u8 *buf)
1513 {
1514         struct cdrom_info *info = drive->driver_data;
1515         struct cdrom_device_info *cdi = &info->devinfo;
1516         struct packet_command cgc;
1517         int stat, attempts = 3, size = ATAPI_CAPABILITIES_PAGE_SIZE;
1518
1519         if ((info->cd_flags & IDE_CD_FLAG_FULL_CAPS_PAGE) == 0)
1520                 size -= ATAPI_CAPABILITIES_PAGE_PAD_SIZE;
1521
1522         init_cdrom_command(&cgc, buf, size, CGC_DATA_UNKNOWN);
1523         do {
1524                 /* we seem to get stat=0x01,err=0x00 the first time (??) */
1525                 stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1526                 if (!stat)
1527                         break;
1528         } while (--attempts);
1529         return stat;
1530 }
1531
1532 void ide_cdrom_update_speed(ide_drive_t *drive, u8 *buf)
1533 {
1534         struct cdrom_info *cd = drive->driver_data;
1535         u16 curspeed, maxspeed;
1536
1537         curspeed = *(u16 *)&buf[8 + 14];
1538         maxspeed = *(u16 *)&buf[8 +  8];
1539
1540         if (cd->cd_flags & IDE_CD_FLAG_LE_SPEED_FIELDS) {
1541                 curspeed = le16_to_cpu(curspeed);
1542                 maxspeed = le16_to_cpu(maxspeed);
1543         } else {
1544                 curspeed = be16_to_cpu(curspeed);
1545                 maxspeed = be16_to_cpu(maxspeed);
1546         }
1547
1548         cd->current_speed = (curspeed + (176/2)) / 176;
1549         cd->max_speed = (maxspeed + (176/2)) / 176;
1550 }
1551
1552 #define IDE_CD_CAPABILITIES \
1553         (CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK | CDC_SELECT_SPEED | \
1554          CDC_SELECT_DISC | CDC_MULTI_SESSION | CDC_MCN | CDC_MEDIA_CHANGED | \
1555          CDC_PLAY_AUDIO | CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R | \
1556          CDC_CD_RW | CDC_DVD | CDC_DVD_R | CDC_DVD_RAM | CDC_GENERIC_PACKET | \
1557          CDC_MO_DRIVE | CDC_MRW | CDC_MRW_W | CDC_RAM)
1558
1559 static struct cdrom_device_ops ide_cdrom_dops = {
1560         .open                   = ide_cdrom_open_real,
1561         .release                = ide_cdrom_release_real,
1562         .drive_status           = ide_cdrom_drive_status,
1563         .media_changed          = ide_cdrom_check_media_change_real,
1564         .tray_move              = ide_cdrom_tray_move,
1565         .lock_door              = ide_cdrom_lock_door,
1566         .select_speed           = ide_cdrom_select_speed,
1567         .get_last_session       = ide_cdrom_get_last_session,
1568         .get_mcn                = ide_cdrom_get_mcn,
1569         .reset                  = ide_cdrom_reset,
1570         .audio_ioctl            = ide_cdrom_audio_ioctl,
1571         .capability             = IDE_CD_CAPABILITIES,
1572         .generic_packet         = ide_cdrom_packet,
1573 };
1574
1575 static int ide_cdrom_register(ide_drive_t *drive, int nslots)
1576 {
1577         struct cdrom_info *info = drive->driver_data;
1578         struct cdrom_device_info *devinfo = &info->devinfo;
1579
1580         devinfo->ops = &ide_cdrom_dops;
1581         devinfo->speed = info->current_speed;
1582         devinfo->capacity = nslots;
1583         devinfo->handle = drive;
1584         strcpy(devinfo->name, drive->name);
1585
1586         if (info->cd_flags & IDE_CD_FLAG_NO_SPEED_SELECT)
1587                 devinfo->mask |= CDC_SELECT_SPEED;
1588
1589         devinfo->disk = info->disk;
1590         return register_cdrom(devinfo);
1591 }
1592
1593 static int ide_cdrom_probe_capabilities(ide_drive_t *drive)
1594 {
1595         struct cdrom_info *cd = drive->driver_data;
1596         struct cdrom_device_info *cdi = &cd->devinfo;
1597         u8 buf[ATAPI_CAPABILITIES_PAGE_SIZE];
1598         mechtype_t mechtype;
1599         int nslots = 1;
1600
1601         cdi->mask = (CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R |
1602                      CDC_DVD_RAM | CDC_SELECT_DISC | CDC_PLAY_AUDIO |
1603                      CDC_MO_DRIVE | CDC_RAM);
1604
1605         if (drive->media == ide_optical) {
1606                 cdi->mask &= ~(CDC_MO_DRIVE | CDC_RAM);
1607                 printk(KERN_ERR "%s: ATAPI magneto-optical drive\n",
1608                                 drive->name);
1609                 return nslots;
1610         }
1611
1612         if (cd->cd_flags & IDE_CD_FLAG_PRE_ATAPI12) {
1613                 cd->cd_flags &= ~IDE_CD_FLAG_NO_EJECT;
1614                 cdi->mask &= ~CDC_PLAY_AUDIO;
1615                 return nslots;
1616         }
1617
1618         /*
1619          * We have to cheat a little here. the packet will eventually be queued
1620          * with ide_cdrom_packet(), which extracts the drive from cdi->handle.
1621          * Since this device hasn't been registered with the Uniform layer yet,
1622          * it can't do this. Same goes for cdi->ops.
1623          */
1624         cdi->handle = drive;
1625         cdi->ops = &ide_cdrom_dops;
1626
1627         if (ide_cdrom_get_capabilities(drive, buf))
1628                 return 0;
1629
1630         if ((buf[8 + 6] & 0x01) == 0)
1631                 cd->cd_flags |= IDE_CD_FLAG_NO_DOORLOCK;
1632         if (buf[8 + 6] & 0x08)
1633                 cd->cd_flags &= ~IDE_CD_FLAG_NO_EJECT;
1634         if (buf[8 + 3] & 0x01)
1635                 cdi->mask &= ~CDC_CD_R;
1636         if (buf[8 + 3] & 0x02)
1637                 cdi->mask &= ~(CDC_CD_RW | CDC_RAM);
1638         if (buf[8 + 2] & 0x38)
1639                 cdi->mask &= ~CDC_DVD;
1640         if (buf[8 + 3] & 0x20)
1641                 cdi->mask &= ~(CDC_DVD_RAM | CDC_RAM);
1642         if (buf[8 + 3] & 0x10)
1643                 cdi->mask &= ~CDC_DVD_R;
1644         if ((buf[8 + 4] & 0x01) || (cd->cd_flags & IDE_CD_FLAG_PLAY_AUDIO_OK))
1645                 cdi->mask &= ~CDC_PLAY_AUDIO;
1646
1647         mechtype = buf[8 + 6] >> 5;
1648         if (mechtype == mechtype_caddy || mechtype == mechtype_popup)
1649                 cdi->mask |= CDC_CLOSE_TRAY;
1650
1651         if (cdi->sanyo_slot > 0) {
1652                 cdi->mask &= ~CDC_SELECT_DISC;
1653                 nslots = 3;
1654         } else if (mechtype == mechtype_individual_changer ||
1655                    mechtype == mechtype_cartridge_changer) {
1656                 nslots = cdrom_number_of_slots(cdi);
1657                 if (nslots > 1)
1658                         cdi->mask &= ~CDC_SELECT_DISC;
1659         }
1660
1661         ide_cdrom_update_speed(drive, buf);
1662
1663         printk(KERN_INFO "%s: ATAPI", drive->name);
1664
1665         /* don't print speed if the drive reported 0 */
1666         if (cd->max_speed)
1667                 printk(KERN_CONT " %dX", cd->max_speed);
1668
1669         printk(KERN_CONT " %s", (cdi->mask & CDC_DVD) ? "CD-ROM" : "DVD-ROM");
1670
1671         if ((cdi->mask & CDC_DVD_R) == 0 || (cdi->mask & CDC_DVD_RAM) == 0)
1672                 printk(KERN_CONT " DVD%s%s",
1673                                  (cdi->mask & CDC_DVD_R) ? "" : "-R",
1674                                  (cdi->mask & CDC_DVD_RAM) ? "" : "-RAM");
1675
1676         if ((cdi->mask & CDC_CD_R) == 0 || (cdi->mask & CDC_CD_RW) == 0)
1677                 printk(KERN_CONT " CD%s%s",
1678                                  (cdi->mask & CDC_CD_R) ? "" : "-R",
1679                                  (cdi->mask & CDC_CD_RW) ? "" : "/RW");
1680
1681         if ((cdi->mask & CDC_SELECT_DISC) == 0)
1682                 printk(KERN_CONT " changer w/%d slots", nslots);
1683         else
1684                 printk(KERN_CONT " drive");
1685
1686         printk(KERN_CONT ", %dkB Cache\n", be16_to_cpu(*(u16 *)&buf[8 + 12]));
1687
1688         return nslots;
1689 }
1690
1691 /* standard prep_rq_fn that builds 10 byte cmds */
1692 static int ide_cdrom_prep_fs(struct request_queue *q, struct request *rq)
1693 {
1694         int hard_sect = queue_hardsect_size(q);
1695         long block = (long)rq->hard_sector / (hard_sect >> 9);
1696         unsigned long blocks = rq->hard_nr_sectors / (hard_sect >> 9);
1697
1698         memset(rq->cmd, 0, BLK_MAX_CDB);
1699
1700         if (rq_data_dir(rq) == READ)
1701                 rq->cmd[0] = GPCMD_READ_10;
1702         else
1703                 rq->cmd[0] = GPCMD_WRITE_10;
1704
1705         /*
1706          * fill in lba
1707          */
1708         rq->cmd[2] = (block >> 24) & 0xff;
1709         rq->cmd[3] = (block >> 16) & 0xff;
1710         rq->cmd[4] = (block >>  8) & 0xff;
1711         rq->cmd[5] = block & 0xff;
1712
1713         /*
1714          * and transfer length
1715          */
1716         rq->cmd[7] = (blocks >> 8) & 0xff;
1717         rq->cmd[8] = blocks & 0xff;
1718         rq->cmd_len = 10;
1719         return BLKPREP_OK;
1720 }
1721
1722 /*
1723  * Most of the SCSI commands are supported directly by ATAPI devices.
1724  * This transform handles the few exceptions.
1725  */
1726 static int ide_cdrom_prep_pc(struct request *rq)
1727 {
1728         u8 *c = rq->cmd;
1729
1730         /* transform 6-byte read/write commands to the 10-byte version */
1731         if (c[0] == READ_6 || c[0] == WRITE_6) {
1732                 c[8] = c[4];
1733                 c[5] = c[3];
1734                 c[4] = c[2];
1735                 c[3] = c[1] & 0x1f;
1736                 c[2] = 0;
1737                 c[1] &= 0xe0;
1738                 c[0] += (READ_10 - READ_6);
1739                 rq->cmd_len = 10;
1740                 return BLKPREP_OK;
1741         }
1742
1743         /*
1744          * it's silly to pretend we understand 6-byte sense commands, just
1745          * reject with ILLEGAL_REQUEST and the caller should take the
1746          * appropriate action
1747          */
1748         if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
1749                 rq->errors = ILLEGAL_REQUEST;
1750                 return BLKPREP_KILL;
1751         }
1752
1753         return BLKPREP_OK;
1754 }
1755
1756 static int ide_cdrom_prep_fn(struct request_queue *q, struct request *rq)
1757 {
1758         if (blk_fs_request(rq))
1759                 return ide_cdrom_prep_fs(q, rq);
1760         else if (blk_pc_request(rq))
1761                 return ide_cdrom_prep_pc(rq);
1762
1763         return 0;
1764 }
1765
1766 struct cd_list_entry {
1767         const char      *id_model;
1768         const char      *id_firmware;
1769         unsigned int    cd_flags;
1770 };
1771
1772 #ifdef CONFIG_IDE_PROC_FS
1773 static sector_t ide_cdrom_capacity(ide_drive_t *drive)
1774 {
1775         unsigned long capacity, sectors_per_frame;
1776
1777         if (cdrom_read_capacity(drive, &capacity, &sectors_per_frame, NULL))
1778                 return 0;
1779
1780         return capacity * sectors_per_frame;
1781 }
1782
1783 static int proc_idecd_read_capacity(char *page, char **start, off_t off,
1784                                         int count, int *eof, void *data)
1785 {
1786         ide_drive_t *drive = data;
1787         int len;
1788
1789         len = sprintf(page, "%llu\n", (long long)ide_cdrom_capacity(drive));
1790         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
1791 }
1792
1793 static ide_proc_entry_t idecd_proc[] = {
1794         { "capacity", S_IFREG|S_IRUGO, proc_idecd_read_capacity, NULL },
1795         { NULL, 0, NULL, NULL }
1796 };
1797
1798 static void ide_cdrom_add_settings(ide_drive_t *drive)
1799 {
1800         ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1,
1801                         &drive->dsc_overlap, NULL);
1802 }
1803 #else
1804 static inline void ide_cdrom_add_settings(ide_drive_t *drive) { ; }
1805 #endif
1806
1807 static const struct cd_list_entry ide_cd_quirks_list[] = {
1808         /* Limit transfer size per interrupt. */
1809         { "SAMSUNG CD-ROM SCR-2430", NULL,   IDE_CD_FLAG_LIMIT_NFRAMES      },
1810         { "SAMSUNG CD-ROM SCR-2432", NULL,   IDE_CD_FLAG_LIMIT_NFRAMES      },
1811         /* SCR-3231 doesn't support the SET_CD_SPEED command. */
1812         { "SAMSUNG CD-ROM SCR-3231", NULL,   IDE_CD_FLAG_NO_SPEED_SELECT    },
1813         /* Old NEC260 (not R) was released before ATAPI 1.2 spec. */
1814         { "NEC CD-ROM DRIVE:260",    "1.01", IDE_CD_FLAG_TOCADDR_AS_BCD |
1815                                              IDE_CD_FLAG_PRE_ATAPI12,       },
1816         /* Vertos 300, some versions of this drive like to talk BCD. */
1817         { "V003S0DS",                NULL,   IDE_CD_FLAG_VERTOS_300_SSD,    },
1818         /* Vertos 600 ESD. */
1819         { "V006E0DS",                NULL,   IDE_CD_FLAG_VERTOS_600_ESD,    },
1820         /*
1821          * Sanyo 3 CD changer uses a non-standard command for CD changing
1822          * (by default standard ATAPI support for CD changers is used).
1823          */
1824         { "CD-ROM CDR-C3 G",         NULL,   IDE_CD_FLAG_SANYO_3CD          },
1825         { "CD-ROM CDR-C3G",          NULL,   IDE_CD_FLAG_SANYO_3CD          },
1826         { "CD-ROM CDR_C36",          NULL,   IDE_CD_FLAG_SANYO_3CD          },
1827         /* Stingray 8X CD-ROM. */
1828         { "STINGRAY 8422 IDE 8X CD-ROM 7-27-95", NULL, IDE_CD_FLAG_PRE_ATAPI12},
1829         /*
1830          * ACER 50X CD-ROM and WPI 32X CD-ROM require the full spec length
1831          * mode sense page capabilities size, but older drives break.
1832          */
1833         { "ATAPI CD ROM DRIVE 50X MAX", NULL,   IDE_CD_FLAG_FULL_CAPS_PAGE  },
1834         { "WPI CDS-32X",                NULL,   IDE_CD_FLAG_FULL_CAPS_PAGE  },
1835         /* ACER/AOpen 24X CD-ROM has the speed fields byte-swapped. */
1836         { "",                        "241N", IDE_CD_FLAG_LE_SPEED_FIELDS    },
1837         /*
1838          * Some drives used by Apple don't advertise audio play
1839          * but they do support reading TOC & audio datas.
1840          */
1841         { "MATSHITADVD-ROM SR-8187", NULL,   IDE_CD_FLAG_PLAY_AUDIO_OK      },
1842         { "MATSHITADVD-ROM SR-8186", NULL,   IDE_CD_FLAG_PLAY_AUDIO_OK      },
1843         { "MATSHITADVD-ROM SR-8176", NULL,   IDE_CD_FLAG_PLAY_AUDIO_OK      },
1844         { "MATSHITADVD-ROM SR-8174", NULL,   IDE_CD_FLAG_PLAY_AUDIO_OK      },
1845         { "Optiarc DVD RW AD-5200A", NULL,   IDE_CD_FLAG_PLAY_AUDIO_OK      },
1846         { NULL, NULL, 0 }
1847 };
1848
1849 static unsigned int ide_cd_flags(struct hd_driveid *id)
1850 {
1851         const struct cd_list_entry *cle = ide_cd_quirks_list;
1852
1853         while (cle->id_model) {
1854                 if (strcmp(cle->id_model, id->model) == 0 &&
1855                     (cle->id_firmware == NULL ||
1856                      strstr(id->fw_rev, cle->id_firmware)))
1857                         return cle->cd_flags;
1858                 cle++;
1859         }
1860
1861         return 0;
1862 }
1863
1864 static int ide_cdrom_setup(ide_drive_t *drive)
1865 {
1866         struct cdrom_info *cd = drive->driver_data;
1867         struct cdrom_device_info *cdi = &cd->devinfo;
1868         struct hd_driveid *id = drive->id;
1869         int nslots;
1870
1871         blk_queue_prep_rq(drive->queue, ide_cdrom_prep_fn);
1872         blk_queue_dma_alignment(drive->queue, 31);
1873         drive->queue->unplug_delay = (1 * HZ) / 1000;
1874         if (!drive->queue->unplug_delay)
1875                 drive->queue->unplug_delay = 1;
1876
1877         drive->special.all      = 0;
1878
1879         cd->cd_flags = IDE_CD_FLAG_MEDIA_CHANGED | IDE_CD_FLAG_NO_EJECT |
1880                        ide_cd_flags(id);
1881
1882         if ((id->config & 0x0060) == 0x20)
1883                 cd->cd_flags |= IDE_CD_FLAG_DRQ_INTERRUPT;
1884
1885         if ((cd->cd_flags & IDE_CD_FLAG_VERTOS_300_SSD) &&
1886             id->fw_rev[4] == '1' && id->fw_rev[6] <= '2')
1887                 cd->cd_flags |= (IDE_CD_FLAG_TOCTRACKS_AS_BCD |
1888                                  IDE_CD_FLAG_TOCADDR_AS_BCD);
1889         else if ((cd->cd_flags & IDE_CD_FLAG_VERTOS_600_ESD) &&
1890                  id->fw_rev[4] == '1' && id->fw_rev[6] <= '2')
1891                 cd->cd_flags |= IDE_CD_FLAG_TOCTRACKS_AS_BCD;
1892         else if (cd->cd_flags & IDE_CD_FLAG_SANYO_3CD)
1893                 /* 3 => use CD in slot 0 */
1894                 cdi->sanyo_slot = 3;
1895
1896         nslots = ide_cdrom_probe_capabilities(drive);
1897
1898         /* set correct block size */
1899         blk_queue_hardsect_size(drive->queue, CD_FRAMESIZE);
1900
1901         drive->dsc_overlap = (drive->next != drive);
1902
1903         if (ide_cdrom_register(drive, nslots)) {
1904                 printk(KERN_ERR "%s: %s failed to register device with the"
1905                                 " cdrom driver.\n", drive->name, __func__);
1906                 cd->devinfo.handle = NULL;
1907                 return 1;
1908         }
1909         ide_cdrom_add_settings(drive);
1910         return 0;
1911 }
1912
1913 static void ide_cd_remove(ide_drive_t *drive)
1914 {
1915         struct cdrom_info *info = drive->driver_data;
1916
1917         ide_proc_unregister_driver(drive, info->driver);
1918
1919         del_gendisk(info->disk);
1920
1921         ide_cd_put(info);
1922 }
1923
1924 static void ide_cd_release(struct kref *kref)
1925 {
1926         struct cdrom_info *info = to_ide_cd(kref);
1927         struct cdrom_device_info *devinfo = &info->devinfo;
1928         ide_drive_t *drive = info->drive;
1929         struct gendisk *g = info->disk;
1930
1931         kfree(info->toc);
1932         if (devinfo->handle == drive)
1933                 unregister_cdrom(devinfo);
1934         drive->dsc_overlap = 0;
1935         drive->driver_data = NULL;
1936         blk_queue_prep_rq(drive->queue, NULL);
1937         g->private_data = NULL;
1938         put_disk(g);
1939         kfree(info);
1940 }
1941
1942 static int ide_cd_probe(ide_drive_t *);
1943
1944 static ide_driver_t ide_cdrom_driver = {
1945         .gen_driver = {
1946                 .owner          = THIS_MODULE,
1947                 .name           = "ide-cdrom",
1948                 .bus            = &ide_bus_type,
1949         },
1950         .probe                  = ide_cd_probe,
1951         .remove                 = ide_cd_remove,
1952         .version                = IDECD_VERSION,
1953         .media                  = ide_cdrom,
1954         .supports_dsc_overlap   = 1,
1955         .do_request             = ide_do_rw_cdrom,
1956         .end_request            = ide_end_request,
1957         .error                  = __ide_error,
1958         .abort                  = __ide_abort,
1959 #ifdef CONFIG_IDE_PROC_FS
1960         .proc                   = idecd_proc,
1961 #endif
1962 };
1963
1964 static int idecd_open(struct inode *inode, struct file *file)
1965 {
1966         struct gendisk *disk = inode->i_bdev->bd_disk;
1967         struct cdrom_info *info;
1968         int rc = -ENOMEM;
1969
1970         info = ide_cd_get(disk);
1971         if (!info)
1972                 return -ENXIO;
1973
1974         rc = cdrom_open(&info->devinfo, inode, file);
1975
1976         if (rc < 0)
1977                 ide_cd_put(info);
1978
1979         return rc;
1980 }
1981
1982 static int idecd_release(struct inode *inode, struct file *file)
1983 {
1984         struct gendisk *disk = inode->i_bdev->bd_disk;
1985         struct cdrom_info *info = ide_cd_g(disk);
1986
1987         cdrom_release(&info->devinfo, file);
1988
1989         ide_cd_put(info);
1990
1991         return 0;
1992 }
1993
1994 static int idecd_set_spindown(struct cdrom_device_info *cdi, unsigned long arg)
1995 {
1996         struct packet_command cgc;
1997         char buffer[16];
1998         int stat;
1999         char spindown;
2000
2001         if (copy_from_user(&spindown, (void __user *)arg, sizeof(char)))
2002                 return -EFAULT;
2003
2004         init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_UNKNOWN);
2005
2006         stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CDROM_PAGE, 0);
2007         if (stat)
2008                 return stat;
2009
2010         buffer[11] = (buffer[11] & 0xf0) | (spindown & 0x0f);
2011         return cdrom_mode_select(cdi, &cgc);
2012 }
2013
2014 static int idecd_get_spindown(struct cdrom_device_info *cdi, unsigned long arg)
2015 {
2016         struct packet_command cgc;
2017         char buffer[16];
2018         int stat;
2019         char spindown;
2020
2021         init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_UNKNOWN);
2022
2023         stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CDROM_PAGE, 0);
2024         if (stat)
2025                 return stat;
2026
2027         spindown = buffer[11] & 0x0f;
2028         if (copy_to_user((void __user *)arg, &spindown, sizeof(char)))
2029                 return -EFAULT;
2030         return 0;
2031 }
2032
2033 static int idecd_ioctl(struct inode *inode, struct file *file,
2034                         unsigned int cmd, unsigned long arg)
2035 {
2036         struct block_device *bdev = inode->i_bdev;
2037         struct cdrom_info *info = ide_cd_g(bdev->bd_disk);
2038         int err;
2039
2040         switch (cmd) {
2041         case CDROMSETSPINDOWN:
2042                 return idecd_set_spindown(&info->devinfo, arg);
2043         case CDROMGETSPINDOWN:
2044                 return idecd_get_spindown(&info->devinfo, arg);
2045         default:
2046                 break;
2047         }
2048
2049         err = generic_ide_ioctl(info->drive, file, bdev, cmd, arg);
2050         if (err == -EINVAL)
2051                 err = cdrom_ioctl(file, &info->devinfo, inode, cmd, arg);
2052
2053         return err;
2054 }
2055
2056 static int idecd_media_changed(struct gendisk *disk)
2057 {
2058         struct cdrom_info *info = ide_cd_g(disk);
2059         return cdrom_media_changed(&info->devinfo);
2060 }
2061
2062 static int idecd_revalidate_disk(struct gendisk *disk)
2063 {
2064         struct cdrom_info *info = ide_cd_g(disk);
2065         struct request_sense sense;
2066
2067         ide_cd_read_toc(info->drive, &sense);
2068
2069         return  0;
2070 }
2071
2072 static struct block_device_operations idecd_ops = {
2073         .owner                  = THIS_MODULE,
2074         .open                   = idecd_open,
2075         .release                = idecd_release,
2076         .ioctl                  = idecd_ioctl,
2077         .media_changed          = idecd_media_changed,
2078         .revalidate_disk        = idecd_revalidate_disk
2079 };
2080
2081 /* module options */
2082 static char *ignore;
2083
2084 module_param(ignore, charp, 0400);
2085 MODULE_DESCRIPTION("ATAPI CD-ROM Driver");
2086
2087 static int ide_cd_probe(ide_drive_t *drive)
2088 {
2089         struct cdrom_info *info;
2090         struct gendisk *g;
2091         struct request_sense sense;
2092
2093         if (!strstr("ide-cdrom", drive->driver_req))
2094                 goto failed;
2095         if (!drive->present)
2096                 goto failed;
2097         if (drive->media != ide_cdrom && drive->media != ide_optical)
2098                 goto failed;
2099         /* skip drives that we were told to ignore */
2100         if (ignore != NULL) {
2101                 if (strstr(ignore, drive->name)) {
2102                         printk(KERN_INFO "ide-cd: ignoring drive %s\n",
2103                                          drive->name);
2104                         goto failed;
2105                 }
2106         }
2107         if (drive->scsi) {
2108                 printk(KERN_INFO "ide-cd: passing drive %s to ide-scsi "
2109                                  "emulation.\n", drive->name);
2110                 goto failed;
2111         }
2112         info = kzalloc(sizeof(struct cdrom_info), GFP_KERNEL);
2113         if (info == NULL) {
2114                 printk(KERN_ERR "%s: Can't allocate a cdrom structure\n",
2115                                 drive->name);
2116                 goto failed;
2117         }
2118
2119         g = alloc_disk(1 << PARTN_BITS);
2120         if (!g)
2121                 goto out_free_cd;
2122
2123         ide_init_disk(g, drive);
2124
2125         ide_proc_register_driver(drive, &ide_cdrom_driver);
2126
2127         kref_init(&info->kref);
2128
2129         info->drive = drive;
2130         info->driver = &ide_cdrom_driver;
2131         info->disk = g;
2132
2133         g->private_data = &info->driver;
2134
2135         drive->driver_data = info;
2136
2137         g->minors = 1;
2138         g->driverfs_dev = &drive->gendev;
2139         g->flags = GENHD_FL_CD | GENHD_FL_REMOVABLE;
2140         if (ide_cdrom_setup(drive)) {
2141                 ide_proc_unregister_driver(drive, &ide_cdrom_driver);
2142                 ide_cd_release(&info->kref);
2143                 goto failed;
2144         }
2145
2146         ide_cd_read_toc(drive, &sense);
2147         g->fops = &idecd_ops;
2148         g->flags |= GENHD_FL_REMOVABLE;
2149         add_disk(g);
2150         return 0;
2151
2152 out_free_cd:
2153         kfree(info);
2154 failed:
2155         return -ENODEV;
2156 }
2157
2158 static void __exit ide_cdrom_exit(void)
2159 {
2160         driver_unregister(&ide_cdrom_driver.gen_driver);
2161 }
2162
2163 static int __init ide_cdrom_init(void)
2164 {
2165         return driver_register(&ide_cdrom_driver.gen_driver);
2166 }
2167
2168 MODULE_ALIAS("ide:*m-cdrom*");
2169 MODULE_ALIAS("ide-cd");
2170 module_init(ide_cdrom_init);
2171 module_exit(ide_cdrom_exit);
2172 MODULE_LICENSE("GPL");