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

   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 void ide_cd_release(struct kref *);
  61
  62 static struct cdrom_info *ide_cd_get(struct gendisk *disk)
  63 {
  64         struct cdrom_info *cd = NULL;
  65
  66         mutex_lock(&idecd_ref_mutex);
  67         cd = ide_cd_g(disk);
  68         if (cd) {
  69                 kref_get(&cd->kref);
  70                 if (ide_device_get(cd->drive)) {
  71                         kref_put(&cd->kref, ide_cd_release);
  72                         cd = NULL;
  73                 }
  74         }
  75         mutex_unlock(&idecd_ref_mutex);
  76         return cd;
  77 }
  78
  79 static void ide_cd_put(struct cdrom_info *cd)
  80 {
  81         mutex_lock(&idecd_ref_mutex);
  82         ide_device_put(cd->drive);
  83         kref_put(&cd->kref, ide_cd_release);
  84         mutex_unlock(&idecd_ref_mutex);
  85 }
  86
  87 /*
  88  * Generic packet command support and error handling routines.
  89  */
  90
  91 /* Mark that we've seen a media change and invalidate our internal buffers. */
  92 static void cdrom_saw_media_change(ide_drive_t *drive)
  93 {
  94         drive->atapi_flags |= IDE_AFLAG_MEDIA_CHANGED;
  95         drive->atapi_flags &= ~IDE_AFLAG_TOC_VALID;
  96 }
  97
  98 static int cdrom_log_sense(ide_drive_t *drive, struct request *rq,
  99                            struct request_sense *sense)
 100 {
 101         int log = 0;
 102
 103         if (!sense || !rq || (rq->cmd_flags & REQ_QUIET))
 104                 return 0;
 105
 106         switch (sense->sense_key) {
 107         case NO_SENSE:
 108         case RECOVERED_ERROR:
 109                 break;
 110         case NOT_READY:
 111                 /*
 112                  * don't care about tray state messages for e.g. capacity
 113                  * commands or in-progress or becoming ready
 114                  */
 115                 if (sense->asc == 0x3a || sense->asc == 0x04)
 116                         break;
 117                 log = 1;
 118                 break;
 119         case ILLEGAL_REQUEST:
 120                 /*
 121                  * don't log START_STOP unit with LoEj set, since we cannot
 122                  * reliably check if drive can auto-close
 123                  */
 124                 if (rq->cmd[0] == GPCMD_START_STOP_UNIT && sense->asc == 0x24)
 125                         break;
 126                 log = 1;
 127                 break;
 128         case UNIT_ATTENTION:
 129                 /*
 130                  * Make good and sure we've seen this potential media change.
 131                  * Some drives (i.e. Creative) fail to present the correct sense
 132                  * key in the error register.
 133                  */
 134                 cdrom_saw_media_change(drive);
 135                 break;
 136         default:
 137                 log = 1;
 138                 break;
 139         }
 140         return log;
 141 }
 142
 143 static void cdrom_analyze_sense_data(ide_drive_t *drive,
 144                               struct request *failed_command,
 145                               struct request_sense *sense)
 146 {
 147         unsigned long sector;
 148         unsigned long bio_sectors;
 149         struct cdrom_info *info = drive->driver_data;
 150
 151         if (!cdrom_log_sense(drive, failed_command, sense))
 152                 return;
 153
 154         /*
 155          * If a read toc is executed for a CD-R or CD-RW medium where the first
 156          * toc has not been recorded yet, it will fail with 05/24/00 (which is a
 157          * confusing error)
 158          */
 159         if (failed_command && failed_command->cmd[0] == GPCMD_READ_TOC_PMA_ATIP)
 160                 if (sense->sense_key == 0x05 && sense->asc == 0x24)
 161                         return;
 162
 163         /* current error */
 164         if (sense->error_code == 0x70) {
 165                 switch (sense->sense_key) {
 166                 case MEDIUM_ERROR:
 167                 case VOLUME_OVERFLOW:
 168                 case ILLEGAL_REQUEST:
 169                         if (!sense->valid)
 170                                 break;
 171                         if (failed_command == NULL ||
 172                                         !blk_fs_request(failed_command))
 173                                 break;
 174                         sector = (sense->information[0] << 24) |
 175                                  (sense->information[1] << 16) |
 176                                  (sense->information[2] <<  8) |
 177                                  (sense->information[3]);
 178
 179                         if (drive->queue->hardsect_size == 2048)
 180                                 /* device sector size is 2K */
 181                                 sector <<= 2;
 182
 183                         bio_sectors = max(bio_sectors(failed_command->bio), 4U);
 184                         sector &= ~(bio_sectors - 1);
 185
 186                         if (sector < get_capacity(info->disk) &&
 187                             drive->probed_capacity - sector < 4 * 75)
 188                                 set_capacity(info->disk, sector);
 189                 }
 190         }
 191
 192         ide_cd_log_error(drive->name, failed_command, sense);
 193 }
 194
 195 static void cdrom_queue_request_sense(ide_drive_t *drive, void *sense,
 196                                       struct request *failed_command)
 197 {
 198         struct cdrom_info *info         = drive->driver_data;
 199         struct request *rq              = &info->request_sense_request;
 200
 201         if (sense == NULL)
 202                 sense = &info->sense_data;
 203
 204         /* stuff the sense request in front of our current request */
 205         blk_rq_init(NULL, rq);
 206         rq->cmd_type = REQ_TYPE_ATA_PC;
 207         rq->rq_disk = info->disk;
 208
 209         rq->data = sense;
 210         rq->cmd[0] = GPCMD_REQUEST_SENSE;
 211         rq->cmd[4] = 18;
 212         rq->data_len = 18;
 213
 214         rq->cmd_type = REQ_TYPE_SENSE;
 215         rq->cmd_flags |= REQ_PREEMPT;
 216
 217         /* NOTE! Save the failed command in "rq->buffer" */
 218         rq->buffer = (void *) failed_command;
 219
 220         ide_do_drive_cmd(drive, rq);
 221 }
 222
 223 static void cdrom_end_request(ide_drive_t *drive, int uptodate)
 224 {
 225         struct request *rq = HWGROUP(drive)->rq;
 226         int nsectors = rq->hard_cur_sectors;
 227
 228         if (blk_sense_request(rq) && uptodate) {
 229                 /*
 230                  * For REQ_TYPE_SENSE, "rq->buffer" points to the original
 231                  * failed request
 232                  */
 233                 struct request *failed = (struct request *) rq->buffer;
 234                 struct cdrom_info *info = drive->driver_data;
 235                 void *sense = &info->sense_data;
 236                 unsigned long flags;
 237
 238                 if (failed) {
 239                         if (failed->sense) {
 240                                 sense = failed->sense;
 241                                 failed->sense_len = rq->sense_len;
 242                         }
 243                         cdrom_analyze_sense_data(drive, failed, sense);
 244                         /*
 245                          * now end the failed request
 246                          */
 247                         if (blk_fs_request(failed)) {
 248                                 if (ide_end_dequeued_request(drive, failed, 0,
 249                                                 failed->hard_nr_sectors))
 250                                         BUG();
 251                         } else {
 252                                 spin_lock_irqsave(&ide_lock, flags);
 253                                 if (__blk_end_request(failed, -EIO,
 254                                                       failed->data_len))
 255                                         BUG();
 256                                 spin_unlock_irqrestore(&ide_lock, flags);
 257                         }
 258                 } else
 259                         cdrom_analyze_sense_data(drive, NULL, sense);
 260         }
 261
 262         if (!rq->current_nr_sectors && blk_fs_request(rq))
 263                 uptodate = 1;
 264         /* make sure it's fully ended */
 265         if (blk_pc_request(rq))
 266                 nsectors = (rq->data_len + 511) >> 9;
 267         if (!nsectors)
 268                 nsectors = 1;
 269
 270         ide_end_request(drive, uptodate, nsectors);
 271 }
 272
 273 static void ide_dump_status_no_sense(ide_drive_t *drive, const char *msg, u8 st)
 274 {
 275         if (st & 0x80)
 276                 return;
 277         ide_dump_status(drive, msg, st);
 278 }
 279
 280 /*
 281  * Returns:
 282  * 0: if the request should be continued.
 283  * 1: if the request was ended.
 284  */
 285 static int cdrom_decode_status(ide_drive_t *drive, int good_stat, int *stat_ret)
 286 {
 287         ide_hwif_t *hwif = drive->hwif;
 288         struct request *rq = hwif->hwgroup->rq;
 289         int stat, err, sense_key;
 290
 291         /* check for errors */
 292         stat = hwif->tp_ops->read_status(hwif);
 293
 294         if (stat_ret)
 295                 *stat_ret = stat;
 296
 297         if (OK_STAT(stat, good_stat, BAD_R_STAT))
 298                 return 0;
 299
 300         /* get the IDE error register */
 301         err = ide_read_error(drive);
 302         sense_key = err >> 4;
 303
 304         if (rq == NULL) {
 305                 printk(KERN_ERR "%s: missing rq in %s\n",
 306                                 drive->name, __func__);
 307                 return 1;
 308         }
 309
 310         if (blk_sense_request(rq)) {
 311                 /*
 312                  * We got an error trying to get sense info from the drive
 313                  * (probably while trying to recover from a former error).
 314                  * Just give up.
 315                  */
 316                 rq->cmd_flags |= REQ_FAILED;
 317                 cdrom_end_request(drive, 0);
 318                 ide_error(drive, "request sense failure", stat);
 319                 return 1;
 320
 321         } else if (blk_pc_request(rq) || rq->cmd_type == REQ_TYPE_ATA_PC) {
 322                 /* All other functions, except for READ. */
 323
 324                 /*
 325                  * if we have an error, pass back CHECK_CONDITION as the
 326                  * scsi status byte
 327                  */
 328                 if (blk_pc_request(rq) && !rq->errors)
 329                         rq->errors = SAM_STAT_CHECK_CONDITION;
 330
 331                 /* check for tray open */
 332                 if (sense_key == NOT_READY) {
 333                         cdrom_saw_media_change(drive);
 334                 } else if (sense_key == UNIT_ATTENTION) {
 335                         /* check for media change */
 336                         cdrom_saw_media_change(drive);
 337                         return 0;
 338                 } else if (sense_key == ILLEGAL_REQUEST &&
 339                            rq->cmd[0] == GPCMD_START_STOP_UNIT) {
 340                         /*
 341                          * Don't print error message for this condition--
 342                          * SFF8090i indicates that 5/24/00 is the correct
 343                          * response to a request to close the tray if the
 344                          * drive doesn't have that capability.
 345                          * cdrom_log_sense() knows this!
 346                          */
 347                 } else if (!(rq->cmd_flags & REQ_QUIET)) {
 348                         /* otherwise, print an error */
 349                         ide_dump_status(drive, "packet command error", stat);
 350                 }
 351
 352                 rq->cmd_flags |= REQ_FAILED;
 353
 354                 /*
 355                  * instead of playing games with moving completions around,
 356                  * remove failed request completely and end it when the
 357                  * request sense has completed
 358                  */
 359                 goto end_request;
 360
 361         } else if (blk_fs_request(rq)) {
 362                 int do_end_request = 0;
 363
 364                 /* handle errors from READ and WRITE requests */
 365
 366                 if (blk_noretry_request(rq))
 367                         do_end_request = 1;
 368
 369                 if (sense_key == NOT_READY) {
 370                         /* tray open */
 371                         if (rq_data_dir(rq) == READ) {
 372                                 cdrom_saw_media_change(drive);
 373
 374                                 /* fail the request */
 375                                 printk(KERN_ERR "%s: tray open\n", drive->name);
 376                                 do_end_request = 1;
 377                         } else {
 378                                 struct cdrom_info *info = drive->driver_data;
 379
 380                                 /*
 381                                  * Allow the drive 5 seconds to recover, some
 382                                  * devices will return this error while flushing
 383                                  * data from cache.
 384                                  */
 385                                 if (!rq->errors)
 386                                         info->write_timeout = jiffies +
 387                                                         ATAPI_WAIT_WRITE_BUSY;
 388                                 rq->errors = 1;
 389                                 if (time_after(jiffies, info->write_timeout))
 390                                         do_end_request = 1;
 391                                 else {
 392                                         unsigned long flags;
 393
 394                                         /*
 395                                          * take a breather relying on the unplug
 396                                          * timer to kick us again
 397                                          */
 398                                         spin_lock_irqsave(&ide_lock, flags);
 399                                         blk_plug_device(drive->queue);
 400                                         spin_unlock_irqrestore(&ide_lock,
 401                                                                 flags);
 402                                         return 1;
 403                                 }
 404                         }
 405                 } else if (sense_key == UNIT_ATTENTION) {
 406                         /* media change */
 407                         cdrom_saw_media_change(drive);
 408
 409                         /*
 410                          * Arrange to retry the request but be sure to give up
 411                          * if we've retried too many times.
 412                          */
 413                         if (++rq->errors > ERROR_MAX)
 414                                 do_end_request = 1;
 415                 } else if (sense_key == ILLEGAL_REQUEST ||
 416                            sense_key == DATA_PROTECT) {
 417                         /*
 418                          * No point in retrying after an illegal request or data
 419                          * protect error.
 420                          */
 421                         ide_dump_status_no_sense(drive, "command error", stat);
 422                         do_end_request = 1;
 423                 } else if (sense_key == MEDIUM_ERROR) {
 424                         /*
 425                          * No point in re-trying a zillion times on a bad
 426                          * sector. If we got here the error is not correctable.
 427                          */
 428                         ide_dump_status_no_sense(drive,
 429                                                  "media error (bad sector)",
 430                                                  stat);
 431                         do_end_request = 1;
 432                 } else if (sense_key == BLANK_CHECK) {
 433                         /* disk appears blank ?? */
 434                         ide_dump_status_no_sense(drive, "media error (blank)",
 435                                                  stat);
 436                         do_end_request = 1;
 437                 } else if ((err & ~ABRT_ERR) != 0) {
 438                         /* go to the default handler for other errors */
 439                         ide_error(drive, "cdrom_decode_status", stat);
 440                         return 1;
 441                 } else if ((++rq->errors > ERROR_MAX)) {
 442                         /* we've racked up too many retries, abort */
 443                         do_end_request = 1;
 444                 }
 445
 446                 /*
 447                  * End a request through request sense analysis when we have
 448                  * sense data. We need this in order to perform end of media
 449                  * processing.
 450                  */
 451                 if (do_end_request)
 452                         goto end_request;
 453
 454                 /*
 455                  * If we got a CHECK_CONDITION status, queue
 456                  * a request sense command.
 457                  */
 458                 if (stat & ERR_STAT)
 459                         cdrom_queue_request_sense(drive, NULL, NULL);
 460         } else {
 461                 blk_dump_rq_flags(rq, "ide-cd: bad rq");
 462                 cdrom_end_request(drive, 0);
 463         }
 464
 465         /* retry, or handle the next request */
 466         return 1;
 467
 468 end_request:
 469         if (stat & ERR_STAT) {
 470                 unsigned long flags;
 471
 472                 spin_lock_irqsave(&ide_lock, flags);
 473                 blkdev_dequeue_request(rq);
 474                 HWGROUP(drive)->rq = NULL;
 475                 spin_unlock_irqrestore(&ide_lock, flags);
 476
 477                 cdrom_queue_request_sense(drive, rq->sense, rq);
 478         } else
 479                 cdrom_end_request(drive, 0);
 480
 481         return 1;
 482 }
 483
 484 static int cdrom_timer_expiry(ide_drive_t *drive)
 485 {
 486         struct request *rq = HWGROUP(drive)->rq;
 487         unsigned long wait = 0;
 488
 489         /*
 490          * Some commands are *slow* and normally take a long time to complete.
 491          * Usually we can use the ATAPI "disconnect" to bypass this, but not all
 492          * commands/drives support that. Let ide_timer_expiry keep polling us
 493          * for these.
 494          */
 495         switch (rq->cmd[0]) {
 496         case GPCMD_BLANK:
 497         case GPCMD_FORMAT_UNIT:
 498         case GPCMD_RESERVE_RZONE_TRACK:
 499         case GPCMD_CLOSE_TRACK:
 500         case GPCMD_FLUSH_CACHE:
 501                 wait = ATAPI_WAIT_PC;
 502                 break;
 503         default:
 504                 if (!(rq->cmd_flags & REQ_QUIET))
 505                         printk(KERN_INFO "ide-cd: cmd 0x%x timed out\n",
 506                                          rq->cmd[0]);
 507                 wait = 0;
 508                 break;
 509         }
 510         return wait;
 511 }
 512
 513 /*
 514  * Set up the device registers for transferring a packet command on DEV,
 515  * expecting to later transfer XFERLEN bytes.  HANDLER is the routine
 516  * which actually transfers the command to the drive.  If this is a
 517  * drq_interrupt device, this routine will arrange for HANDLER to be
 518  * called when the interrupt from the drive arrives.  Otherwise, HANDLER
 519  * will be called immediately after the drive is prepared for the transfer.
 520  */
 521 static ide_startstop_t cdrom_start_packet_command(ide_drive_t *drive,
 522                                                   int xferlen,
 523                                                   ide_handler_t *handler)
 524 {
 525         struct cdrom_info *info = drive->driver_data;
 526         ide_hwif_t *hwif = drive->hwif;
 527
 528         /* FIXME: for Virtual DMA we must check harder */
 529         if (info->dma)
 530                 info->dma = !hwif->dma_ops->dma_setup(drive);
 531
 532         /* set up the controller registers */
 533         ide_pktcmd_tf_load(drive, IDE_TFLAG_OUT_NSECT | IDE_TFLAG_OUT_LBAL,
 534                            xferlen, info->dma);
 535
 536         if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
 537                 /* waiting for CDB interrupt, not DMA yet. */
 538                 if (info->dma)
 539                         drive->waiting_for_dma = 0;
 540
 541                 /* packet command */
 542                 ide_execute_command(drive, WIN_PACKETCMD, handler,
 543                                     ATAPI_WAIT_PC, cdrom_timer_expiry);
 544                 return ide_started;
 545         } else {
 546                 ide_execute_pkt_cmd(drive);
 547
 548                 return (*handler) (drive);
 549         }
 550 }
 551
 552 /*
 553  * Send a packet command to DRIVE described by CMD_BUF and CMD_LEN. The device
 554  * registers must have already been prepared by cdrom_start_packet_command.
 555  * HANDLER is the interrupt handler to call when the command completes or
 556  * there's data ready.
 557  */
 558 #define ATAPI_MIN_CDB_BYTES 12
 559 static ide_startstop_t cdrom_transfer_packet_command(ide_drive_t *drive,
 560                                           struct request *rq,
 561                                           ide_handler_t *handler)
 562 {
 563         ide_hwif_t *hwif = drive->hwif;
 564         int cmd_len;
 565         struct cdrom_info *info = drive->driver_data;
 566         ide_startstop_t startstop;
 567
 568         if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
 569                 /*
 570                  * Here we should have been called after receiving an interrupt
 571                  * from the device.  DRQ should how be set.
 572                  */
 573
 574                 /* check for errors */
 575                 if (cdrom_decode_status(drive, DRQ_STAT, NULL))
 576                         return ide_stopped;
 577
 578                 /* ok, next interrupt will be DMA interrupt */
 579                 if (info->dma)
 580                         drive->waiting_for_dma = 1;
 581         } else {
 582                 /* otherwise, we must wait for DRQ to get set */
 583                 if (ide_wait_stat(&startstop, drive, DRQ_STAT,
 584                                 BUSY_STAT, WAIT_READY))
 585                         return startstop;
 586         }
 587
 588         /* arm the interrupt handler */
 589         ide_set_handler(drive, handler, rq->timeout, cdrom_timer_expiry);
 590
 591         /* ATAPI commands get padded out to 12 bytes minimum */
 592         cmd_len = COMMAND_SIZE(rq->cmd[0]);
 593         if (cmd_len < ATAPI_MIN_CDB_BYTES)
 594                 cmd_len = ATAPI_MIN_CDB_BYTES;
 595
 596         /* send the command to the device */
 597         hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);
 598
 599         /* start the DMA if need be */
 600         if (info->dma)
 601                 hwif->dma_ops->dma_start(drive);
 602
 603         return ide_started;
 604 }
 605
 606 /*
 607  * Check the contents of the interrupt reason register from the cdrom
 608  * and attempt to recover if there are problems.  Returns  0 if everything's
 609  * ok; nonzero if the request has been terminated.
 610  */
 611 static int ide_cd_check_ireason(ide_drive_t *drive, struct request *rq,
 612                                 int len, int ireason, int rw)
 613 {
 614         ide_hwif_t *hwif = drive->hwif;
 615
 616         /*
 617          * ireason == 0: the drive wants to receive data from us
 618          * ireason == 2: the drive is expecting to transfer data to us
 619          */
 620         if (ireason == (!rw << 1))
 621                 return 0;
 622         else if (ireason == (rw << 1)) {
 623
 624                 /* whoops... */
 625                 printk(KERN_ERR "%s: %s: wrong transfer direction!\n",
 626                                 drive->name, __func__);
 627
 628                 ide_pad_transfer(drive, rw, len);
 629         } else  if (rw == 0 && ireason == 1) {
 630                 /*
 631                  * Some drives (ASUS) seem to tell us that status info is
 632                  * available.  Just get it and ignore.
 633                  */
 634                 (void)hwif->tp_ops->read_status(hwif);
 635                 return 0;
 636         } else {
 637                 /* drive wants a command packet, or invalid ireason... */
 638                 printk(KERN_ERR "%s: %s: bad interrupt reason 0x%02x\n",
 639                                 drive->name, __func__, ireason);
 640         }
 641
 642         if (rq->cmd_type == REQ_TYPE_ATA_PC)
 643                 rq->cmd_flags |= REQ_FAILED;
 644
 645         cdrom_end_request(drive, 0);
 646         return -1;
 647 }
 648
 649 /*
 650  * Assume that the drive will always provide data in multiples of at least
 651  * SECTOR_SIZE, as it gets hairy to keep track of the transfers otherwise.
 652  */
 653 static int ide_cd_check_transfer_size(ide_drive_t *drive, int len)
 654 {
 655         if ((len % SECTOR_SIZE) == 0)
 656                 return 0;
 657
 658         printk(KERN_ERR "%s: %s: Bad transfer size %d\n",
 659                         drive->name, __func__, len);
 660
 661         if (drive->atapi_flags & IDE_AFLAG_LIMIT_NFRAMES)
 662                 printk(KERN_ERR "  This drive is not supported by "
 663                                 "this version of the driver\n");
 664         else {
 665                 printk(KERN_ERR "  Trying to limit transfer sizes\n");
 666                 drive->atapi_flags |= IDE_AFLAG_LIMIT_NFRAMES;
 667         }
 668
 669         return 1;
 670 }
 671
 672 static ide_startstop_t cdrom_newpc_intr(ide_drive_t *);
 673
 674 static ide_startstop_t ide_cd_prepare_rw_request(ide_drive_t *drive,
 675                                                  struct request *rq)
 676 {
 677         if (rq_data_dir(rq) == READ) {
 678                 unsigned short sectors_per_frame =
 679                         queue_hardsect_size(drive->queue) >> SECTOR_BITS;
 680                 int nskip = rq->sector & (sectors_per_frame - 1);
 681
 682                 /*
 683                  * If the requested sector doesn't start on a frame boundary,
 684                  * we must adjust the start of the transfer so that it does,
 685                  * and remember to skip the first few sectors.
 686                  *
 687                  * If the rq->current_nr_sectors field is larger than the size
 688                  * of the buffer, it will mean that we're to skip a number of
 689                  * sectors equal to the amount by which rq->current_nr_sectors
 690                  * is larger than the buffer size.
 691                  */
 692                 if (nskip > 0) {
 693                         /* sanity check... */
 694                         if (rq->current_nr_sectors !=
 695                             bio_cur_sectors(rq->bio)) {
 696                                 printk(KERN_ERR "%s: %s: buffer botch (%u)\n",
 697                                                 drive->name, __func__,
 698                                                 rq->current_nr_sectors);
 699                                 cdrom_end_request(drive, 0);
 700                                 return ide_stopped;
 701                         }
 702                         rq->current_nr_sectors += nskip;
 703                 }
 704         }
 705 #if 0
 706         else
 707                 /* the immediate bit */
 708                 rq->cmd[1] = 1 << 3;
 709 #endif
 710         /* set up the command */
 711         rq->timeout = ATAPI_WAIT_PC;
 712
 713         return ide_started;
 714 }
 715
 716 /*
 717  * Routine to send a read/write packet command to the drive. This is usually
 718  * called directly from cdrom_start_{read,write}(). However, for drq_interrupt
 719  * devices, it is called from an interrupt when the drive is ready to accept
 720  * the command.
 721  */
 722 static ide_startstop_t cdrom_start_rw_cont(ide_drive_t *drive)
 723 {
 724         struct request *rq = drive->hwif->hwgroup->rq;
 725
 726         /* send the command to the drive and return */
 727         return cdrom_transfer_packet_command(drive, rq, cdrom_newpc_intr);
 728 }
 729
 730 #define IDECD_SEEK_THRESHOLD    (1000)                  /* 1000 blocks */
 731 #define IDECD_SEEK_TIMER        (5 * WAIT_MIN_SLEEP)    /* 100 ms */
 732 #define IDECD_SEEK_TIMEOUT      (2 * WAIT_CMD)          /* 20 sec */
 733
 734 static ide_startstop_t cdrom_seek_intr(ide_drive_t *drive)
 735 {
 736         struct cdrom_info *info = drive->driver_data;
 737         int stat;
 738         static int retry = 10;
 739
 740         if (cdrom_decode_status(drive, 0, &stat))
 741                 return ide_stopped;
 742
 743         drive->atapi_flags |= IDE_AFLAG_SEEKING;
 744
 745         if (retry && time_after(jiffies, info->start_seek + IDECD_SEEK_TIMER)) {
 746                 if (--retry == 0)
 747                         drive->dsc_overlap = 0;
 748         }
 749         return ide_stopped;
 750 }
 751
 752 static void ide_cd_prepare_seek_request(ide_drive_t *drive, struct request *rq)
 753 {
 754         sector_t frame = rq->sector;
 755
 756         sector_div(frame, queue_hardsect_size(drive->queue) >> SECTOR_BITS);
 757
 758         memset(rq->cmd, 0, BLK_MAX_CDB);
 759         rq->cmd[0] = GPCMD_SEEK;
 760         put_unaligned(cpu_to_be32(frame), (unsigned int *) &rq->cmd[2]);
 761
 762         rq->timeout = ATAPI_WAIT_PC;
 763 }
 764
 765 static ide_startstop_t cdrom_start_seek_continuation(ide_drive_t *drive)
 766 {
 767         struct request *rq = drive->hwif->hwgroup->rq;
 768
 769         return cdrom_transfer_packet_command(drive, rq, &cdrom_seek_intr);
 770 }
 771
 772 /*
 773  * Fix up a possibly partially-processed request so that we can start it over
 774  * entirely, or even put it back on the request queue.
 775  */
 776 static void restore_request(struct request *rq)
 777 {
 778         if (rq->buffer != bio_data(rq->bio)) {
 779                 sector_t n =
 780                         (rq->buffer - (char *)bio_data(rq->bio)) / SECTOR_SIZE;
 781
 782                 rq->buffer = bio_data(rq->bio);
 783                 rq->nr_sectors += n;
 784                 rq->sector -= n;
 785         }
 786         rq->current_nr_sectors = bio_cur_sectors(rq->bio);
 787         rq->hard_cur_sectors = rq->current_nr_sectors;
 788         rq->hard_nr_sectors = rq->nr_sectors;
 789         rq->hard_sector = rq->sector;
 790         rq->q->prep_rq_fn(rq->q, rq);
 791 }
 792
 793 /*
 794  * All other packet commands.
 795  */
 796 static void ide_cd_request_sense_fixup(struct request *rq)
 797 {
 798         /*
 799          * Some of the trailing request sense fields are optional,
 800          * and some drives don't send them.  Sigh.
 801          */
 802         if (rq->cmd[0] == GPCMD_REQUEST_SENSE &&
 803             rq->data_len > 0 && rq->data_len <= 5)
 804                 while (rq->data_len > 0) {
 805                         *(u8 *)rq->data++ = 0;
 806                         --rq->data_len;
 807                 }
 808 }
 809
 810 int ide_cd_queue_pc(ide_drive_t *drive, const unsigned char *cmd,
 811                     int write, void *buffer, unsigned *bufflen,
 812                     struct request_sense *sense, int timeout,
 813                     unsigned int cmd_flags)
 814 {
 815         struct cdrom_info *info = drive->driver_data;
 816         struct request_sense local_sense;
 817         int retries = 10;
 818         unsigned int flags = 0;
 819
 820         if (!sense)
 821                 sense = &local_sense;
 822
 823         /* start of retry loop */
 824         do {
 825                 struct request *rq;
 826                 int error;
 827
 828                 rq = blk_get_request(drive->queue, write, __GFP_WAIT);
 829
 830                 memcpy(rq->cmd, cmd, BLK_MAX_CDB);
 831                 rq->cmd_type = REQ_TYPE_ATA_PC;
 832                 rq->sense = sense;
 833                 rq->cmd_flags |= cmd_flags;
 834                 rq->timeout = timeout;
 835                 if (buffer) {
 836                         rq->data = buffer;
 837                         rq->data_len = *bufflen;
 838                 }
 839
 840                 error = blk_execute_rq(drive->queue, info->disk, rq, 0);
 841
 842                 if (buffer)
 843                         *bufflen = rq->data_len;
 844
 845                 flags = rq->cmd_flags;
 846                 blk_put_request(rq);
 847
 848                 /*
 849                  * FIXME: we should probably abort/retry or something in case of
 850                  * failure.
 851                  */
 852                 if (flags & REQ_FAILED) {
 853                         /*
 854                          * The request failed.  Retry if it was due to a unit
 855                          * attention status (usually means media was changed).
 856                          */
 857                         struct request_sense *reqbuf = sense;
 858
 859                         if (reqbuf->sense_key == UNIT_ATTENTION)
 860                                 cdrom_saw_media_change(drive);
 861                         else if (reqbuf->sense_key == NOT_READY &&
 862                                  reqbuf->asc == 4 && reqbuf->ascq != 4) {
 863                                 /*
 864                                  * The drive is in the process of loading
 865                                  * a disk.  Retry, but wait a little to give
 866                                  * the drive time to complete the load.
 867                                  */
 868                                 ssleep(2);
 869                         } else {
 870                                 /* otherwise, don't retry */
 871                                 retries = 0;
 872                         }
 873                         --retries;
 874                 }
 875
 876                 /* end of retry loop */
 877         } while ((flags & REQ_FAILED) && retries >= 0);
 878
 879         /* return an error if the command failed */
 880         return (flags & REQ_FAILED) ? -EIO : 0;
 881 }
 882
 883 /*
 884  * Called from blk_end_request_callback() after the data of the request is
 885  * completed and before the request itself is completed. By returning value '1',
 886  * blk_end_request_callback() returns immediately without completing it.
 887  */
 888 static int cdrom_newpc_intr_dummy_cb(struct request *rq)
 889 {
 890         return 1;
 891 }
 892
 893 static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
 894 {
 895         ide_hwif_t *hwif = drive->hwif;
 896         struct cdrom_info *info = drive->driver_data;
 897         struct request *rq = HWGROUP(drive)->rq;
 898         xfer_func_t *xferfunc;
 899         ide_expiry_t *expiry = NULL;
 900         int dma_error = 0, dma, stat, thislen, uptodate = 0;
 901         int write = (rq_data_dir(rq) == WRITE) ? 1 : 0;
 902         unsigned int timeout;
 903         u16 len;
 904         u8 ireason;
 905
 906         /* check for errors */
 907         dma = info->dma;
 908         if (dma) {
 909                 info->dma = 0;
 910                 dma_error = hwif->dma_ops->dma_end(drive);
 911                 if (dma_error) {
 912                         printk(KERN_ERR "%s: DMA %s error\n", drive->name,
 913                                         write ? "write" : "read");
 914                         ide_dma_off(drive);
 915                 }
 916         }
 917
 918         if (cdrom_decode_status(drive, 0, &stat))
 919                 return ide_stopped;
 920
 921         /* using dma, transfer is complete now */
 922         if (dma) {
 923                 if (dma_error)
 924                         return ide_error(drive, "dma error", stat);
 925                 if (blk_fs_request(rq)) {
 926                         ide_end_request(drive, 1, rq->nr_sectors);
 927                         return ide_stopped;
 928                 }
 929                 goto end_request;
 930         }
 931
 932         ide_read_bcount_and_ireason(drive, &len, &ireason);
 933
 934         thislen = blk_fs_request(rq) ? len : rq->data_len;
 935         if (thislen > len)
 936                 thislen = len;
 937
 938         /* If DRQ is clear, the command has completed. */
 939         if ((stat & DRQ_STAT) == 0) {
 940                 if (blk_fs_request(rq)) {
 941                         /*
 942                          * If we're not done reading/writing, complain.
 943                          * Otherwise, complete the command normally.
 944                          */
 945                         uptodate = 1;
 946                         if (rq->current_nr_sectors > 0) {
 947                                 printk(KERN_ERR "%s: %s: data underrun "
 948                                                 "(%d blocks)\n",
 949                                                 drive->name, __func__,
 950                                                 rq->current_nr_sectors);
 951                                 if (!write)
 952                                         rq->cmd_flags |= REQ_FAILED;
 953                                 uptodate = 0;
 954                         }
 955                         cdrom_end_request(drive, uptodate);
 956                         return ide_stopped;
 957                 } else if (!blk_pc_request(rq)) {
 958                         ide_cd_request_sense_fixup(rq);
 959                         /* complain if we still have data left to transfer */
 960                         uptodate = rq->data_len ? 0 : 1;
 961                 }
 962                 goto end_request;
 963         }
 964
 965         /* check which way to transfer data */
 966         if (ide_cd_check_ireason(drive, rq, len, ireason, write))
 967                 return ide_stopped;
 968
 969         if (blk_fs_request(rq)) {
 970                 if (write == 0) {
 971                         int nskip;
 972
 973                         if (ide_cd_check_transfer_size(drive, len)) {
 974                                 cdrom_end_request(drive, 0);
 975                                 return ide_stopped;
 976                         }
 977
 978                         /*
 979                          * First, figure out if we need to bit-bucket
 980                          * any of the leading sectors.
 981                          */
 982                         nskip = min_t(int, rq->current_nr_sectors
 983                                            - bio_cur_sectors(rq->bio),
 984                                            thislen >> 9);
 985                         if (nskip > 0) {
 986                                 ide_pad_transfer(drive, write, nskip << 9);
 987                                 rq->current_nr_sectors -= nskip;
 988                                 thislen -= (nskip << 9);
 989                         }
 990                 }
 991         }
 992
 993         if (ireason == 0) {
 994                 write = 1;
 995                 xferfunc = hwif->tp_ops->output_data;
 996         } else {
 997                 write = 0;
 998                 xferfunc = hwif->tp_ops->input_data;
 999         }
1000
1001         /* transfer data */
1002         while (thislen > 0) {
1003                 u8 *ptr = blk_fs_request(rq) ? NULL : rq->data;
1004                 int blen = rq->data_len;
1005
1006                 /* bio backed? */
1007                 if (rq->bio) {
1008                         if (blk_fs_request(rq)) {
1009                                 ptr = rq->buffer;
1010                                 blen = rq->current_nr_sectors << 9;
1011                         } else {
1012                                 ptr = bio_data(rq->bio);
1013                                 blen = bio_iovec(rq->bio)->bv_len;
1014                         }
1015                 }
1016
1017                 if (!ptr) {
1018                         if (blk_fs_request(rq) && !write)
1019                                 /*
1020                                  * If the buffers are full, pipe the rest into
1021                                  * oblivion.
1022                                  */
1023                                 ide_pad_transfer(drive, 0, thislen);
1024                         else {
1025                                 printk(KERN_ERR "%s: confused, missing data\n",
1026                                                 drive->name);
1027                                 blk_dump_rq_flags(rq, rq_data_dir(rq)
1028                                                   ? "cdrom_newpc_intr, write"
1029                                                   : "cdrom_newpc_intr, read");
1030                         }
1031                         break;
1032                 }
1033
1034                 if (blen > thislen)
1035                         blen = thislen;
1036
1037                 xferfunc(drive, NULL, ptr, blen);
1038
1039                 thislen -= blen;
1040                 len -= blen;
1041
1042                 if (blk_fs_request(rq)) {
1043                         rq->buffer += blen;
1044                         rq->nr_sectors -= (blen >> 9);
1045                         rq->current_nr_sectors -= (blen >> 9);
1046                         rq->sector += (blen >> 9);
1047
1048                         if (rq->current_nr_sectors == 0 && rq->nr_sectors)
1049                                 cdrom_end_request(drive, 1);
1050                 } else {
1051                         rq->data_len -= blen;
1052
1053                         /*
1054                          * The request can't be completed until DRQ is cleared.
1055                          * So complete the data, but don't complete the request
1056                          * using the dummy function for the callback feature
1057                          * of blk_end_request_callback().
1058                          */
1059                         if (rq->bio)
1060                                 blk_end_request_callback(rq, 0, blen,
1061                                                  cdrom_newpc_intr_dummy_cb);
1062                         else
1063                                 rq->data += blen;
1064                 }
1065                 if (!write && blk_sense_request(rq))
1066                         rq->sense_len += blen;
1067         }
1068
1069         /* pad, if necessary */
1070         if (!blk_fs_request(rq) && len > 0)
1071                 ide_pad_transfer(drive, write, len);
1072
1073         if (blk_pc_request(rq)) {
1074                 timeout = rq->timeout;
1075         } else {
1076                 timeout = ATAPI_WAIT_PC;
1077                 if (!blk_fs_request(rq))
1078                         expiry = cdrom_timer_expiry;
1079         }
1080
1081         ide_set_handler(drive, cdrom_newpc_intr, timeout, expiry);
1082         return ide_started;
1083
1084 end_request:
1085         if (blk_pc_request(rq)) {
1086                 unsigned long flags;
1087                 unsigned int dlen = rq->data_len;
1088
1089                 if (dma)
1090                         rq->data_len = 0;
1091
1092                 spin_lock_irqsave(&ide_lock, flags);
1093                 if (__blk_end_request(rq, 0, dlen))
1094                         BUG();
1095                 HWGROUP(drive)->rq = NULL;
1096                 spin_unlock_irqrestore(&ide_lock, flags);
1097         } else {
1098                 if (!uptodate)
1099                         rq->cmd_flags |= REQ_FAILED;
1100                 cdrom_end_request(drive, uptodate);
1101         }
1102         return ide_stopped;
1103 }
1104
1105 static ide_startstop_t cdrom_start_rw(ide_drive_t *drive, struct request *rq)
1106 {
1107         struct cdrom_info *cd = drive->driver_data;
1108         int write = rq_data_dir(rq) == WRITE;
1109         unsigned short sectors_per_frame =
1110                 queue_hardsect_size(drive->queue) >> SECTOR_BITS;
1111
1112         if (write) {
1113                 /* disk has become write protected */
1114                 if (cd->disk->policy) {
1115                         cdrom_end_request(drive, 0);
1116                         return ide_stopped;
1117                 }
1118         } else {
1119                 /*
1120                  * We may be retrying this request after an error.  Fix up any
1121                  * weirdness which might be present in the request packet.
1122                  */
1123                 restore_request(rq);
1124         }
1125
1126         /* use DMA, if possible / writes *must* be hardware frame aligned */
1127         if ((rq->nr_sectors & (sectors_per_frame - 1)) ||
1128             (rq->sector & (sectors_per_frame - 1))) {
1129                 if (write) {
1130                         cdrom_end_request(drive, 0);
1131                         return ide_stopped;
1132                 }
1133                 cd->dma = 0;
1134         } else
1135                 cd->dma = drive->using_dma;
1136
1137         if (write)
1138                 cd->devinfo.media_written = 1;
1139
1140         return ide_started;
1141 }
1142
1143 static ide_startstop_t cdrom_do_newpc_cont(ide_drive_t *drive)
1144 {
1145         struct request *rq = HWGROUP(drive)->rq;
1146
1147         return cdrom_transfer_packet_command(drive, rq, cdrom_newpc_intr);
1148 }
1149
1150 static void cdrom_do_block_pc(ide_drive_t *drive, struct request *rq)
1151 {
1152         struct cdrom_info *info = drive->driver_data;
1153
1154         if (blk_pc_request(rq))
1155                 rq->cmd_flags |= REQ_QUIET;
1156         else
1157                 rq->cmd_flags &= ~REQ_FAILED;
1158
1159         info->dma = 0;
1160
1161         /* sg request */
1162         if (rq->bio || ((rq->cmd_type == REQ_TYPE_ATA_PC) && rq->data_len)) {
1163                 struct request_queue *q = drive->queue;
1164                 unsigned int alignment;
1165                 unsigned long addr;
1166                 unsigned long stack_mask = ~(THREAD_SIZE - 1);
1167
1168                 if (rq->bio)
1169                         addr = (unsigned long)bio_data(rq->bio);
1170                 else
1171                         addr = (unsigned long)rq->data;
1172
1173                 info->dma = drive->using_dma;
1174
1175                 /*
1176                  * check if dma is safe
1177                  *
1178                  * NOTE! The "len" and "addr" checks should possibly have
1179                  * separate masks.
1180                  */
1181                 alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1182                 if (addr & alignment || rq->data_len & alignment)
1183                         info->dma = 0;
1184
1185                 if (!((addr & stack_mask) ^
1186                       ((unsigned long)current->stack & stack_mask)))
1187                         info->dma = 0;
1188         }
1189 }
1190
1191 /*
1192  * cdrom driver request routine.
1193  */
1194 static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
1195                                         sector_t block)
1196 {
1197         struct cdrom_info *info = drive->driver_data;
1198         ide_handler_t *fn;
1199         int xferlen;
1200
1201         if (blk_fs_request(rq)) {
1202                 if (drive->atapi_flags & IDE_AFLAG_SEEKING) {
1203                         ide_hwif_t *hwif = drive->hwif;
1204                         unsigned long elapsed = jiffies - info->start_seek;
1205                         int stat = hwif->tp_ops->read_status(hwif);
1206
1207                         if ((stat & SEEK_STAT) != SEEK_STAT) {
1208                                 if (elapsed < IDECD_SEEK_TIMEOUT) {
1209                                         ide_stall_queue(drive,
1210                                                         IDECD_SEEK_TIMER);
1211                                         return ide_stopped;
1212                                 }
1213                                 printk(KERN_ERR "%s: DSC timeout\n",
1214                                                 drive->name);
1215                         }
1216                         drive->atapi_flags &= ~IDE_AFLAG_SEEKING;
1217                 }
1218                 if (rq_data_dir(rq) == READ &&
1219                     IDE_LARGE_SEEK(info->last_block, block,
1220                             IDECD_SEEK_THRESHOLD) &&
1221                     drive->dsc_overlap) {
1222                         xferlen = 0;
1223                         fn = cdrom_start_seek_continuation;
1224
1225                         info->dma = 0;
1226                         info->start_seek = jiffies;
1227
1228                         ide_cd_prepare_seek_request(drive, rq);
1229                 } else {
1230                         xferlen = 32768;
1231                         fn = cdrom_start_rw_cont;
1232
1233                         if (cdrom_start_rw(drive, rq) == ide_stopped)
1234                                 return ide_stopped;
1235
1236                         if (ide_cd_prepare_rw_request(drive, rq) == ide_stopped)
1237                                 return ide_stopped;
1238                 }
1239                 info->last_block = block;
1240         } else if (blk_sense_request(rq) || blk_pc_request(rq) ||
1241                    rq->cmd_type == REQ_TYPE_ATA_PC) {
1242                 xferlen = rq->data_len;
1243                 fn = cdrom_do_newpc_cont;
1244
1245                 if (!rq->timeout)
1246                         rq->timeout = ATAPI_WAIT_PC;
1247
1248                 cdrom_do_block_pc(drive, rq);
1249         } else if (blk_special_request(rq)) {
1250                 /* right now this can only be a reset... */
1251                 cdrom_end_request(drive, 1);
1252                 return ide_stopped;
1253         } else {
1254                 blk_dump_rq_flags(rq, "ide-cd bad flags");
1255                 cdrom_end_request(drive, 0);
1256                 return ide_stopped;
1257         }
1258
1259         return cdrom_start_packet_command(drive, xferlen, fn);
1260 }
1261
1262 /*
1263  * Ioctl handling.
1264  *
1265  * Routines which queue packet commands take as a final argument a pointer to a
1266  * request_sense struct. If execution of the command results in an error with a
1267  * CHECK CONDITION status, this structure will be filled with the results of the
1268  * subsequent request sense command. The pointer can also be NULL, in which case
1269  * no sense information is returned.
1270  */
1271 static void msf_from_bcd(struct atapi_msf *msf)
1272 {
1273         msf->minute = BCD2BIN(msf->minute);
1274         msf->second = BCD2BIN(msf->second);
1275         msf->frame  = BCD2BIN(msf->frame);
1276 }
1277
1278 int cdrom_check_status(ide_drive_t *drive, struct request_sense *sense)
1279 {
1280         struct cdrom_info *info = drive->driver_data;
1281         struct cdrom_device_info *cdi = &info->devinfo;
1282         unsigned char cmd[BLK_MAX_CDB];
1283
1284         memset(cmd, 0, BLK_MAX_CDB);
1285         cmd[0] = GPCMD_TEST_UNIT_READY;
1286
1287         /*
1288          * Sanyo 3 CD changer uses byte 7 of TEST_UNIT_READY to switch CDs
1289          * instead of supporting the LOAD_UNLOAD opcode.
1290          */
1291         cmd[7] = cdi->sanyo_slot % 3;
1292
1293         return ide_cd_queue_pc(drive, cmd, 0, NULL, NULL, sense, 0, REQ_QUIET);
1294 }
1295
1296 static int cdrom_read_capacity(ide_drive_t *drive, unsigned long *capacity,
1297                                unsigned long *sectors_per_frame,
1298                                struct request_sense *sense)
1299 {
1300         struct {
1301                 __be32 lba;
1302                 __be32 blocklen;
1303         } capbuf;
1304
1305         int stat;
1306         unsigned char cmd[BLK_MAX_CDB];
1307         unsigned len = sizeof(capbuf);
1308
1309         memset(cmd, 0, BLK_MAX_CDB);
1310         cmd[0] = GPCMD_READ_CDVD_CAPACITY;
1311
1312         stat = ide_cd_queue_pc(drive, cmd, 0, &capbuf, &len, sense, 0,
1313                                REQ_QUIET);
1314         if (stat == 0) {
1315                 *capacity = 1 + be32_to_cpu(capbuf.lba);
1316                 *sectors_per_frame =
1317                         be32_to_cpu(capbuf.blocklen) >> SECTOR_BITS;
1318         }
1319
1320         return stat;
1321 }
1322
1323 static int cdrom_read_tocentry(ide_drive_t *drive, int trackno, int msf_flag,
1324                                 int format, char *buf, int buflen,
1325                                 struct request_sense *sense)
1326 {
1327         unsigned char cmd[BLK_MAX_CDB];
1328
1329         memset(cmd, 0, BLK_MAX_CDB);
1330
1331         cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
1332         cmd[6] = trackno;
1333         cmd[7] = (buflen >> 8);
1334         cmd[8] = (buflen & 0xff);
1335         cmd[9] = (format << 6);
1336
1337         if (msf_flag)
1338                 cmd[1] = 2;
1339
1340         return ide_cd_queue_pc(drive, cmd, 0, buf, &buflen, sense, 0, REQ_QUIET);
1341 }
1342
1343 /* Try to read the entire TOC for the disk into our internal buffer. */
1344 int ide_cd_read_toc(ide_drive_t *drive, struct request_sense *sense)
1345 {
1346         int stat, ntracks, i;
1347         struct cdrom_info *info = drive->driver_data;
1348         struct cdrom_device_info *cdi = &info->devinfo;
1349         struct atapi_toc *toc = info->toc;
1350         struct {
1351                 struct atapi_toc_header hdr;
1352                 struct atapi_toc_entry  ent;
1353         } ms_tmp;
1354         long last_written;
1355         unsigned long sectors_per_frame = SECTORS_PER_FRAME;
1356
1357         if (toc == NULL) {
1358                 /* try to allocate space */
1359                 toc = kmalloc(sizeof(struct atapi_toc), GFP_KERNEL);
1360                 if (toc == NULL) {
1361                         printk(KERN_ERR "%s: No cdrom TOC buffer!\n",
1362                                         drive->name);
1363                         return -ENOMEM;
1364                 }
1365                 info->toc = toc;
1366         }
1367
1368         /*
1369          * Check to see if the existing data is still valid. If it is,
1370          * just return.
1371          */
1372         (void) cdrom_check_status(drive, sense);
1373
1374         if (drive->atapi_flags & IDE_AFLAG_TOC_VALID)
1375                 return 0;
1376
1377         /* try to get the total cdrom capacity and sector size */
1378         stat = cdrom_read_capacity(drive, &toc->capacity, &sectors_per_frame,
1379                                    sense);
1380         if (stat)
1381                 toc->capacity = 0x1fffff;
1382
1383         set_capacity(info->disk, toc->capacity * sectors_per_frame);
1384         /* save a private copy of the TOC capacity for error handling */
1385         drive->probed_capacity = toc->capacity * sectors_per_frame;
1386
1387         blk_queue_hardsect_size(drive->queue,
1388                                 sectors_per_frame << SECTOR_BITS);
1389
1390         /* first read just the header, so we know how long the TOC is */
1391         stat = cdrom_read_tocentry(drive, 0, 1, 0, (char *) &toc->hdr,
1392                                     sizeof(struct atapi_toc_header), sense);
1393         if (stat)
1394                 return stat;
1395
1396         if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
1397                 toc->hdr.first_track = BCD2BIN(toc->hdr.first_track);
1398                 toc->hdr.last_track  = BCD2BIN(toc->hdr.last_track);
1399         }
1400
1401         ntracks = toc->hdr.last_track - toc->hdr.first_track + 1;
1402         if (ntracks <= 0)
1403                 return -EIO;
1404         if (ntracks > MAX_TRACKS)
1405                 ntracks = MAX_TRACKS;
1406
1407         /* now read the whole schmeer */
1408         stat = cdrom_read_tocentry(drive, toc->hdr.first_track, 1, 0,
1409                                   (char *)&toc->hdr,
1410                                    sizeof(struct atapi_toc_header) +
1411                                    (ntracks + 1) *
1412                                    sizeof(struct atapi_toc_entry), sense);
1413
1414         if (stat && toc->hdr.first_track > 1) {
1415                 /*
1416                  * Cds with CDI tracks only don't have any TOC entries, despite
1417                  * of this the returned values are
1418                  * first_track == last_track = number of CDI tracks + 1,
1419                  * so that this case is indistinguishable from the same layout
1420                  * plus an additional audio track. If we get an error for the
1421                  * regular case, we assume a CDI without additional audio
1422                  * tracks. In this case the readable TOC is empty (CDI tracks
1423                  * are not included) and only holds the Leadout entry.
1424                  *
1425                  * Heiko Eißfeldt.
1426                  */
1427                 ntracks = 0;
1428                 stat = cdrom_read_tocentry(drive, CDROM_LEADOUT, 1, 0,
1429                                            (char *)&toc->hdr,
1430                                            sizeof(struct atapi_toc_header) +
1431                                            (ntracks + 1) *
1432                                            sizeof(struct atapi_toc_entry),
1433                                            sense);
1434                 if (stat)
1435                         return stat;
1436
1437                 if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
1438                         toc->hdr.first_track = (u8)BIN2BCD(CDROM_LEADOUT);
1439                         toc->hdr.last_track = (u8)BIN2BCD(CDROM_LEADOUT);
1440                 } else {
1441                         toc->hdr.first_track = CDROM_LEADOUT;
1442                         toc->hdr.last_track = CDROM_LEADOUT;
1443                 }
1444         }
1445
1446         if (stat)
1447                 return stat;
1448
1449         toc->hdr.toc_length = be16_to_cpu(toc->hdr.toc_length);
1450
1451         if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
1452                 toc->hdr.first_track = BCD2BIN(toc->hdr.first_track);
1453                 toc->hdr.last_track  = BCD2BIN(toc->hdr.last_track);
1454         }
1455
1456         for (i = 0; i <= ntracks; i++) {
1457                 if (drive->atapi_flags & IDE_AFLAG_TOCADDR_AS_BCD) {
1458                         if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD)
1459                                 toc->ent[i].track = BCD2BIN(toc->ent[i].track);
1460                         msf_from_bcd(&toc->ent[i].addr.msf);
1461                 }
1462                 toc->ent[i].addr.lba = msf_to_lba(toc->ent[i].addr.msf.minute,
1463                                                   toc->ent[i].addr.msf.second,
1464                                                   toc->ent[i].addr.msf.frame);
1465         }
1466
1467         if (toc->hdr.first_track != CDROM_LEADOUT) {
1468                 /* read the multisession information */
1469                 stat = cdrom_read_tocentry(drive, 0, 0, 1, (char *)&ms_tmp,
1470                                            sizeof(ms_tmp), sense);
1471                 if (stat)
1472                         return stat;
1473
1474                 toc->last_session_lba = be32_to_cpu(ms_tmp.ent.addr.lba);
1475         } else {
1476                 ms_tmp.hdr.last_track = CDROM_LEADOUT;
1477                 ms_tmp.hdr.first_track = ms_tmp.hdr.last_track;
1478                 toc->last_session_lba = msf_to_lba(0, 2, 0); /* 0m 2s 0f */
1479         }
1480
1481         if (drive->atapi_flags & IDE_AFLAG_TOCADDR_AS_BCD) {
1482                 /* re-read multisession information using MSF format */
1483                 stat = cdrom_read_tocentry(drive, 0, 1, 1, (char *)&ms_tmp,
1484                                            sizeof(ms_tmp), sense);
1485                 if (stat)
1486                         return stat;
1487
1488                 msf_from_bcd(&ms_tmp.ent.addr.msf);
1489                 toc->last_session_lba = msf_to_lba(ms_tmp.ent.addr.msf.minute,
1490                                                    ms_tmp.ent.addr.msf.second,
1491                                                    ms_tmp.ent.addr.msf.frame);
1492         }
1493
1494         toc->xa_flag = (ms_tmp.hdr.first_track != ms_tmp.hdr.last_track);
1495
1496         /* now try to get the total cdrom capacity */
1497         stat = cdrom_get_last_written(cdi, &last_written);
1498         if (!stat && (last_written > toc->capacity)) {
1499                 toc->capacity = last_written;
1500                 set_capacity(info->disk, toc->capacity * sectors_per_frame);
1501                 drive->probed_capacity = toc->capacity * sectors_per_frame;
1502         }
1503
1504         /* Remember that we've read this stuff. */
1505         drive->atapi_flags |= IDE_AFLAG_TOC_VALID;
1506
1507         return 0;
1508 }
1509
1510 int ide_cdrom_get_capabilities(ide_drive_t *drive, u8 *buf)
1511 {
1512         struct cdrom_info *info = drive->driver_data;
1513         struct cdrom_device_info *cdi = &info->devinfo;
1514         struct packet_command cgc;
1515         int stat, attempts = 3, size = ATAPI_CAPABILITIES_PAGE_SIZE;
1516
1517         if ((drive->atapi_flags & IDE_AFLAG_FULL_CAPS_PAGE) == 0)
1518                 size -= ATAPI_CAPABILITIES_PAGE_PAD_SIZE;
1519
1520         init_cdrom_command(&cgc, buf, size, CGC_DATA_UNKNOWN);
1521         do {
1522                 /* we seem to get stat=0x01,err=0x00 the first time (??) */
1523                 stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1524                 if (!stat)
1525                         break;
1526         } while (--attempts);
1527         return stat;
1528 }
1529
1530 void ide_cdrom_update_speed(ide_drive_t *drive, u8 *buf)
1531 {
1532         struct cdrom_info *cd = drive->driver_data;
1533         u16 curspeed, maxspeed;
1534
1535         if (drive->atapi_flags & IDE_AFLAG_LE_SPEED_FIELDS) {
1536                 curspeed = le16_to_cpup((__le16 *)&buf[8 + 14]);
1537                 maxspeed = le16_to_cpup((__le16 *)&buf[8 + 8]);
1538         } else {
1539                 curspeed = be16_to_cpup((__be16 *)&buf[8 + 14]);
1540                 maxspeed = be16_to_cpup((__be16 *)&buf[8 + 8]);
1541         }
1542
1543         cd->current_speed = (curspeed + (176/2)) / 176;
1544         cd->max_speed = (maxspeed + (176/2)) / 176;
1545 }
1546
1547 #define IDE_CD_CAPABILITIES \
1548         (CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK | CDC_SELECT_SPEED | \
1549          CDC_SELECT_DISC | CDC_MULTI_SESSION | CDC_MCN | CDC_MEDIA_CHANGED | \
1550          CDC_PLAY_AUDIO | CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R | \
1551          CDC_CD_RW | CDC_DVD | CDC_DVD_R | CDC_DVD_RAM | CDC_GENERIC_PACKET | \
1552          CDC_MO_DRIVE | CDC_MRW | CDC_MRW_W | CDC_RAM)
1553
1554 static struct cdrom_device_ops ide_cdrom_dops = {
1555         .open                   = ide_cdrom_open_real,
1556         .release                = ide_cdrom_release_real,
1557         .drive_status           = ide_cdrom_drive_status,
1558         .media_changed          = ide_cdrom_check_media_change_real,
1559         .tray_move              = ide_cdrom_tray_move,
1560         .lock_door              = ide_cdrom_lock_door,
1561         .select_speed           = ide_cdrom_select_speed,
1562         .get_last_session       = ide_cdrom_get_last_session,
1563         .get_mcn                = ide_cdrom_get_mcn,
1564         .reset                  = ide_cdrom_reset,
1565         .audio_ioctl            = ide_cdrom_audio_ioctl,
1566         .capability             = IDE_CD_CAPABILITIES,
1567         .generic_packet         = ide_cdrom_packet,
1568 };
1569
1570 static int ide_cdrom_register(ide_drive_t *drive, int nslots)
1571 {
1572         struct cdrom_info *info = drive->driver_data;
1573         struct cdrom_device_info *devinfo = &info->devinfo;
1574
1575         devinfo->ops = &ide_cdrom_dops;
1576         devinfo->speed = info->current_speed;
1577         devinfo->capacity = nslots;
1578         devinfo->handle = drive;
1579         strcpy(devinfo->name, drive->name);
1580
1581         if (drive->atapi_flags & IDE_AFLAG_NO_SPEED_SELECT)
1582                 devinfo->mask |= CDC_SELECT_SPEED;
1583
1584         devinfo->disk = info->disk;
1585         return register_cdrom(devinfo);
1586 }
1587
1588 static int ide_cdrom_probe_capabilities(ide_drive_t *drive)
1589 {
1590         struct cdrom_info *cd = drive->driver_data;
1591         struct cdrom_device_info *cdi = &cd->devinfo;
1592         u8 buf[ATAPI_CAPABILITIES_PAGE_SIZE];
1593         mechtype_t mechtype;
1594         int nslots = 1;
1595
1596         cdi->mask = (CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R |
1597                      CDC_DVD_RAM | CDC_SELECT_DISC | CDC_PLAY_AUDIO |
1598                      CDC_MO_DRIVE | CDC_RAM);
1599
1600         if (drive->media == ide_optical) {
1601                 cdi->mask &= ~(CDC_MO_DRIVE | CDC_RAM);
1602                 printk(KERN_ERR "%s: ATAPI magneto-optical drive\n",
1603                                 drive->name);
1604                 return nslots;
1605         }
1606
1607         if (drive->atapi_flags & IDE_AFLAG_PRE_ATAPI12) {
1608                 drive->atapi_flags &= ~IDE_AFLAG_NO_EJECT;
1609                 cdi->mask &= ~CDC_PLAY_AUDIO;
1610                 return nslots;
1611         }
1612
1613         /*
1614          * We have to cheat a little here. the packet will eventually be queued
1615          * with ide_cdrom_packet(), which extracts the drive from cdi->handle.
1616          * Since this device hasn't been registered with the Uniform layer yet,
1617          * it can't do this. Same goes for cdi->ops.
1618          */
1619         cdi->handle = drive;
1620         cdi->ops = &ide_cdrom_dops;
1621
1622         if (ide_cdrom_get_capabilities(drive, buf))
1623                 return 0;
1624
1625         if ((buf[8 + 6] & 0x01) == 0)
1626                 drive->atapi_flags |= IDE_AFLAG_NO_DOORLOCK;
1627         if (buf[8 + 6] & 0x08)
1628                 drive->atapi_flags &= ~IDE_AFLAG_NO_EJECT;
1629         if (buf[8 + 3] & 0x01)
1630                 cdi->mask &= ~CDC_CD_R;
1631         if (buf[8 + 3] & 0x02)
1632                 cdi->mask &= ~(CDC_CD_RW | CDC_RAM);
1633         if (buf[8 + 2] & 0x38)
1634                 cdi->mask &= ~CDC_DVD;
1635         if (buf[8 + 3] & 0x20)
1636                 cdi->mask &= ~(CDC_DVD_RAM | CDC_RAM);
1637         if (buf[8 + 3] & 0x10)
1638                 cdi->mask &= ~CDC_DVD_R;
1639         if ((buf[8 + 4] & 0x01) || (drive->atapi_flags & IDE_AFLAG_PLAY_AUDIO_OK))
1640                 cdi->mask &= ~CDC_PLAY_AUDIO;
1641
1642         mechtype = buf[8 + 6] >> 5;
1643         if (mechtype == mechtype_caddy || mechtype == mechtype_popup)
1644                 cdi->mask |= CDC_CLOSE_TRAY;
1645
1646         if (cdi->sanyo_slot > 0) {
1647                 cdi->mask &= ~CDC_SELECT_DISC;
1648                 nslots = 3;
1649         } else if (mechtype == mechtype_individual_changer ||
1650                    mechtype == mechtype_cartridge_changer) {
1651                 nslots = cdrom_number_of_slots(cdi);
1652                 if (nslots > 1)
1653                         cdi->mask &= ~CDC_SELECT_DISC;
1654         }
1655
1656         ide_cdrom_update_speed(drive, buf);
1657
1658         printk(KERN_INFO "%s: ATAPI", drive->name);
1659
1660         /* don't print speed if the drive reported 0 */
1661         if (cd->max_speed)
1662                 printk(KERN_CONT " %dX", cd->max_speed);
1663
1664         printk(KERN_CONT " %s", (cdi->mask & CDC_DVD) ? "CD-ROM" : "DVD-ROM");
1665
1666         if ((cdi->mask & CDC_DVD_R) == 0 || (cdi->mask & CDC_DVD_RAM) == 0)
1667                 printk(KERN_CONT " DVD%s%s",
1668                                  (cdi->mask & CDC_DVD_R) ? "" : "-R",
1669                                  (cdi->mask & CDC_DVD_RAM) ? "" : "-RAM");
1670
1671         if ((cdi->mask & CDC_CD_R) == 0 || (cdi->mask & CDC_CD_RW) == 0)
1672                 printk(KERN_CONT " CD%s%s",
1673                                  (cdi->mask & CDC_CD_R) ? "" : "-R",
1674                                  (cdi->mask & CDC_CD_RW) ? "" : "/RW");
1675
1676         if ((cdi->mask & CDC_SELECT_DISC) == 0)
1677                 printk(KERN_CONT " changer w/%d slots", nslots);
1678         else
1679                 printk(KERN_CONT " drive");
1680
1681         printk(KERN_CONT ", %dkB Cache\n", be16_to_cpup((__be16 *)&buf[8 + 12]));
1682
1683         return nslots;
1684 }
1685
1686 /* standard prep_rq_fn that builds 10 byte cmds */
1687 static int ide_cdrom_prep_fs(struct request_queue *q, struct request *rq)
1688 {
1689         int hard_sect = queue_hardsect_size(q);
1690         long block = (long)rq->hard_sector / (hard_sect >> 9);
1691         unsigned long blocks = rq->hard_nr_sectors / (hard_sect >> 9);
1692
1693         memset(rq->cmd, 0, BLK_MAX_CDB);
1694
1695         if (rq_data_dir(rq) == READ)
1696                 rq->cmd[0] = GPCMD_READ_10;
1697         else
1698                 rq->cmd[0] = GPCMD_WRITE_10;
1699
1700         /*
1701          * fill in lba
1702          */
1703         rq->cmd[2] = (block >> 24) & 0xff;
1704         rq->cmd[3] = (block >> 16) & 0xff;
1705         rq->cmd[4] = (block >>  8) & 0xff;
1706         rq->cmd[5] = block & 0xff;
1707
1708         /*
1709          * and transfer length
1710          */
1711         rq->cmd[7] = (blocks >> 8) & 0xff;
1712         rq->cmd[8] = blocks & 0xff;
1713         rq->cmd_len = 10;
1714         return BLKPREP_OK;
1715 }
1716
1717 /*
1718  * Most of the SCSI commands are supported directly by ATAPI devices.
1719  * This transform handles the few exceptions.
1720  */
1721 static int ide_cdrom_prep_pc(struct request *rq)
1722 {
1723         u8 *c = rq->cmd;
1724
1725         /* transform 6-byte read/write commands to the 10-byte version */
1726         if (c[0] == READ_6 || c[0] == WRITE_6) {
1727                 c[8] = c[4];
1728                 c[5] = c[3];
1729                 c[4] = c[2];
1730                 c[3] = c[1] & 0x1f;
1731                 c[2] = 0;
1732                 c[1] &= 0xe0;
1733                 c[0] += (READ_10 - READ_6);
1734                 rq->cmd_len = 10;
1735                 return BLKPREP_OK;
1736         }
1737
1738         /*
1739          * it's silly to pretend we understand 6-byte sense commands, just
1740          * reject with ILLEGAL_REQUEST and the caller should take the
1741          * appropriate action
1742          */
1743         if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
1744                 rq->errors = ILLEGAL_REQUEST;
1745                 return BLKPREP_KILL;
1746         }
1747
1748         return BLKPREP_OK;
1749 }
1750
1751 static int ide_cdrom_prep_fn(struct request_queue *q, struct request *rq)
1752 {
1753         if (blk_fs_request(rq))
1754                 return ide_cdrom_prep_fs(q, rq);
1755         else if (blk_pc_request(rq))
1756                 return ide_cdrom_prep_pc(rq);
1757
1758         return 0;
1759 }
1760
1761 struct cd_list_entry {
1762         const char      *id_model;
1763         const char      *id_firmware;
1764         unsigned int    cd_flags;
1765 };
1766
1767 #ifdef CONFIG_IDE_PROC_FS
1768 static sector_t ide_cdrom_capacity(ide_drive_t *drive)
1769 {
1770         unsigned long capacity, sectors_per_frame;
1771
1772         if (cdrom_read_capacity(drive, &capacity, &sectors_per_frame, NULL))
1773                 return 0;
1774
1775         return capacity * sectors_per_frame;
1776 }
1777
1778 static int proc_idecd_read_capacity(char *page, char **start, off_t off,
1779                                         int count, int *eof, void *data)
1780 {
1781         ide_drive_t *drive = data;
1782         int len;
1783
1784         len = sprintf(page, "%llu\n", (long long)ide_cdrom_capacity(drive));
1785         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
1786 }
1787
1788 static ide_proc_entry_t idecd_proc[] = {
1789         { "capacity", S_IFREG|S_IRUGO, proc_idecd_read_capacity, NULL },
1790         { NULL, 0, NULL, NULL }
1791 };
1792
1793 static void ide_cdrom_add_settings(ide_drive_t *drive)
1794 {
1795         ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1,
1796                         &drive->dsc_overlap, NULL);
1797 }
1798 #else
1799 static inline void ide_cdrom_add_settings(ide_drive_t *drive) { ; }
1800 #endif
1801
1802 static const struct cd_list_entry ide_cd_quirks_list[] = {
1803         /* Limit transfer size per interrupt. */
1804         { "SAMSUNG CD-ROM SCR-2430", NULL,   IDE_AFLAG_LIMIT_NFRAMES         },
1805         { "SAMSUNG CD-ROM SCR-2432", NULL,   IDE_AFLAG_LIMIT_NFRAMES         },
1806         /* SCR-3231 doesn't support the SET_CD_SPEED command. */
1807         { "SAMSUNG CD-ROM SCR-3231", NULL,   IDE_AFLAG_NO_SPEED_SELECT       },
1808         /* Old NEC260 (not R) was released before ATAPI 1.2 spec. */
1809         { "NEC CD-ROM DRIVE:260",    "1.01", IDE_AFLAG_TOCADDR_AS_BCD |
1810                                              IDE_AFLAG_PRE_ATAPI12,          },
1811         /* Vertos 300, some versions of this drive like to talk BCD. */
1812         { "V003S0DS",                NULL,   IDE_AFLAG_VERTOS_300_SSD,       },
1813         /* Vertos 600 ESD. */
1814         { "V006E0DS",                NULL,   IDE_AFLAG_VERTOS_600_ESD,       },
1815         /*
1816          * Sanyo 3 CD changer uses a non-standard command for CD changing
1817          * (by default standard ATAPI support for CD changers is used).
1818          */
1819         { "CD-ROM CDR-C3 G",         NULL,   IDE_AFLAG_SANYO_3CD             },
1820         { "CD-ROM CDR-C3G",          NULL,   IDE_AFLAG_SANYO_3CD             },
1821         { "CD-ROM CDR_C36",          NULL,   IDE_AFLAG_SANYO_3CD             },
1822         /* Stingray 8X CD-ROM. */
1823         { "STINGRAY 8422 IDE 8X CD-ROM 7-27-95", NULL, IDE_AFLAG_PRE_ATAPI12 },
1824         /*
1825          * ACER 50X CD-ROM and WPI 32X CD-ROM require the full spec length
1826          * mode sense page capabilities size, but older drives break.
1827          */
1828         { "ATAPI CD ROM DRIVE 50X MAX", NULL,   IDE_AFLAG_FULL_CAPS_PAGE     },
1829         { "WPI CDS-32X",                NULL,   IDE_AFLAG_FULL_CAPS_PAGE     },
1830         /* ACER/AOpen 24X CD-ROM has the speed fields byte-swapped. */
1831         { "",                        "241N", IDE_AFLAG_LE_SPEED_FIELDS       },
1832         /*
1833          * Some drives used by Apple don't advertise audio play
1834          * but they do support reading TOC & audio datas.
1835          */
1836         { "MATSHITADVD-ROM SR-8187", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1837         { "MATSHITADVD-ROM SR-8186", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1838         { "MATSHITADVD-ROM SR-8176", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1839         { "MATSHITADVD-ROM SR-8174", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1840         { "Optiarc DVD RW AD-5200A", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1841         { NULL, NULL, 0 }
1842 };
1843
1844 static unsigned int ide_cd_flags(struct hd_driveid *id)
1845 {
1846         const struct cd_list_entry *cle = ide_cd_quirks_list;
1847
1848         while (cle->id_model) {
1849                 if (strcmp(cle->id_model, id->model) == 0 &&
1850                     (cle->id_firmware == NULL ||
1851                      strstr(id->fw_rev, cle->id_firmware)))
1852                         return cle->cd_flags;
1853                 cle++;
1854         }
1855
1856         return 0;
1857 }
1858
1859 static int ide_cdrom_setup(ide_drive_t *drive)
1860 {
1861         struct cdrom_info *cd = drive->driver_data;
1862         struct cdrom_device_info *cdi = &cd->devinfo;
1863         struct hd_driveid *id = drive->id;
1864         int nslots;
1865
1866         blk_queue_prep_rq(drive->queue, ide_cdrom_prep_fn);
1867         blk_queue_dma_alignment(drive->queue, 31);
1868         blk_queue_update_dma_pad(drive->queue, 15);
1869         drive->queue->unplug_delay = (1 * HZ) / 1000;
1870         if (!drive->queue->unplug_delay)
1871                 drive->queue->unplug_delay = 1;
1872
1873         drive->special.all      = 0;
1874
1875         drive->atapi_flags = IDE_AFLAG_MEDIA_CHANGED | IDE_AFLAG_NO_EJECT |
1876                        ide_cd_flags(id);
1877
1878         if ((id->config & 0x0060) == 0x20)
1879                 drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
1880
1881         if ((drive->atapi_flags & IDE_AFLAG_VERTOS_300_SSD) &&
1882             id->fw_rev[4] == '1' && id->fw_rev[6] <= '2')
1883                 drive->atapi_flags |= (IDE_AFLAG_TOCTRACKS_AS_BCD |
1884                                      IDE_AFLAG_TOCADDR_AS_BCD);
1885         else if ((drive->atapi_flags & IDE_AFLAG_VERTOS_600_ESD) &&
1886                  id->fw_rev[4] == '1' && id->fw_rev[6] <= '2')
1887                 drive->atapi_flags |= IDE_AFLAG_TOCTRACKS_AS_BCD;
1888         else if (drive->atapi_flags & IDE_AFLAG_SANYO_3CD)
1889                 /* 3 => use CD in slot 0 */
1890                 cdi->sanyo_slot = 3;
1891
1892         nslots = ide_cdrom_probe_capabilities(drive);
1893
1894         /* set correct block size */
1895         blk_queue_hardsect_size(drive->queue, CD_FRAMESIZE);
1896
1897         drive->dsc_overlap = (drive->next != drive);
1898
1899         if (ide_cdrom_register(drive, nslots)) {
1900                 printk(KERN_ERR "%s: %s failed to register device with the"
1901                                 " cdrom driver.\n", drive->name, __func__);
1902                 cd->devinfo.handle = NULL;
1903                 return 1;
1904         }
1905         ide_cdrom_add_settings(drive);
1906         return 0;
1907 }
1908
1909 static void ide_cd_remove(ide_drive_t *drive)
1910 {
1911         struct cdrom_info *info = drive->driver_data;
1912
1913         ide_proc_unregister_driver(drive, info->driver);
1914
1915         del_gendisk(info->disk);
1916
1917         ide_cd_put(info);
1918 }
1919
1920 static void ide_cd_release(struct kref *kref)
1921 {
1922         struct cdrom_info *info = to_ide_cd(kref);
1923         struct cdrom_device_info *devinfo = &info->devinfo;
1924         ide_drive_t *drive = info->drive;
1925         struct gendisk *g = info->disk;
1926
1927         kfree(info->toc);
1928         if (devinfo->handle == drive)
1929                 unregister_cdrom(devinfo);
1930         drive->dsc_overlap = 0;
1931         drive->driver_data = NULL;
1932         blk_queue_prep_rq(drive->queue, NULL);
1933         g->private_data = NULL;
1934         put_disk(g);
1935         kfree(info);
1936 }
1937
1938 static int ide_cd_probe(ide_drive_t *);
1939
1940 static ide_driver_t ide_cdrom_driver = {
1941         .gen_driver = {
1942                 .owner          = THIS_MODULE,
1943                 .name           = "ide-cdrom",
1944                 .bus            = &ide_bus_type,
1945         },
1946         .probe                  = ide_cd_probe,
1947         .remove                 = ide_cd_remove,
1948         .version                = IDECD_VERSION,
1949         .media                  = ide_cdrom,
1950         .supports_dsc_overlap   = 1,
1951         .do_request             = ide_cd_do_request,
1952         .end_request            = ide_end_request,
1953         .error                  = __ide_error,
1954 #ifdef CONFIG_IDE_PROC_FS
1955         .proc                   = idecd_proc,
1956 #endif
1957 };
1958
1959 static int idecd_open(struct inode *inode, struct file *file)
1960 {
1961         struct gendisk *disk = inode->i_bdev->bd_disk;
1962         struct cdrom_info *info;
1963         int rc = -ENOMEM;
1964
1965         info = ide_cd_get(disk);
1966         if (!info)
1967                 return -ENXIO;
1968
1969         rc = cdrom_open(&info->devinfo, inode, file);
1970
1971         if (rc < 0)
1972                 ide_cd_put(info);
1973
1974         return rc;
1975 }
1976
1977 static int idecd_release(struct inode *inode, struct file *file)
1978 {
1979         struct gendisk *disk = inode->i_bdev->bd_disk;
1980         struct cdrom_info *info = ide_cd_g(disk);
1981
1982         cdrom_release(&info->devinfo, file);
1983
1984         ide_cd_put(info);
1985
1986         return 0;
1987 }
1988
1989 static int idecd_set_spindown(struct cdrom_device_info *cdi, unsigned long arg)
1990 {
1991         struct packet_command cgc;
1992         char buffer[16];
1993         int stat;
1994         char spindown;
1995
1996         if (copy_from_user(&spindown, (void __user *)arg, sizeof(char)))
1997                 return -EFAULT;
1998
1999         init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_UNKNOWN);
2000
2001         stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CDROM_PAGE, 0);
2002         if (stat)
2003                 return stat;
2004
2005         buffer[11] = (buffer[11] & 0xf0) | (spindown & 0x0f);
2006         return cdrom_mode_select(cdi, &cgc);
2007 }
2008
2009 static int idecd_get_spindown(struct cdrom_device_info *cdi, unsigned long arg)
2010 {
2011         struct packet_command cgc;
2012         char buffer[16];
2013         int stat;
2014         char spindown;
2015
2016         init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_UNKNOWN);
2017
2018         stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CDROM_PAGE, 0);
2019         if (stat)
2020                 return stat;
2021
2022         spindown = buffer[11] & 0x0f;
2023         if (copy_to_user((void __user *)arg, &spindown, sizeof(char)))
2024                 return -EFAULT;
2025         return 0;
2026 }
2027
2028 static int idecd_ioctl(struct inode *inode, struct file *file,
2029                         unsigned int cmd, unsigned long arg)
2030 {
2031         struct block_device *bdev = inode->i_bdev;
2032         struct cdrom_info *info = ide_cd_g(bdev->bd_disk);
2033         int err;
2034
2035         switch (cmd) {
2036         case CDROMSETSPINDOWN:
2037                 return idecd_set_spindown(&info->devinfo, arg);
2038         case CDROMGETSPINDOWN:
2039                 return idecd_get_spindown(&info->devinfo, arg);
2040         default:
2041                 break;
2042         }
2043
2044         err = generic_ide_ioctl(info->drive, file, bdev, cmd, arg);
2045         if (err == -EINVAL)
2046                 err = cdrom_ioctl(file, &info->devinfo, inode, cmd, arg);
2047
2048         return err;
2049 }
2050
2051 static int idecd_media_changed(struct gendisk *disk)
2052 {
2053         struct cdrom_info *info = ide_cd_g(disk);
2054         return cdrom_media_changed(&info->devinfo);
2055 }
2056
2057 static int idecd_revalidate_disk(struct gendisk *disk)
2058 {
2059         struct cdrom_info *info = ide_cd_g(disk);
2060         struct request_sense sense;
2061
2062         ide_cd_read_toc(info->drive, &sense);
2063
2064         return  0;
2065 }
2066
2067 static struct block_device_operations idecd_ops = {
2068         .owner                  = THIS_MODULE,
2069         .open                   = idecd_open,
2070         .release                = idecd_release,
2071         .ioctl                  = idecd_ioctl,
2072         .media_changed          = idecd_media_changed,
2073         .revalidate_disk        = idecd_revalidate_disk
2074 };
2075
2076 /* module options */
2077 static char *ignore;
2078
2079 module_param(ignore, charp, 0400);
2080 MODULE_DESCRIPTION("ATAPI CD-ROM Driver");
2081
2082 static int ide_cd_probe(ide_drive_t *drive)
2083 {
2084         struct cdrom_info *info;
2085         struct gendisk *g;
2086         struct request_sense sense;
2087
2088         if (!strstr("ide-cdrom", drive->driver_req))
2089                 goto failed;
2090         if (!drive->present)
2091                 goto failed;
2092         if (drive->media != ide_cdrom && drive->media != ide_optical)
2093                 goto failed;
2094         /* skip drives that we were told to ignore */
2095         if (ignore != NULL) {
2096                 if (strstr(ignore, drive->name)) {
2097                         printk(KERN_INFO "ide-cd: ignoring drive %s\n",
2098                                          drive->name);
2099                         goto failed;
2100                 }
2101         }
2102         info = kzalloc(sizeof(struct cdrom_info), GFP_KERNEL);
2103         if (info == NULL) {
2104                 printk(KERN_ERR "%s: Can't allocate a cdrom structure\n",
2105                                 drive->name);
2106                 goto failed;
2107         }
2108
2109         g = alloc_disk(1 << PARTN_BITS);
2110         if (!g)
2111                 goto out_free_cd;
2112
2113         ide_init_disk(g, drive);
2114
2115         ide_proc_register_driver(drive, &ide_cdrom_driver);
2116
2117         kref_init(&info->kref);
2118
2119         info->drive = drive;
2120         info->driver = &ide_cdrom_driver;
2121         info->disk = g;
2122
2123         g->private_data = &info->driver;
2124
2125         drive->driver_data = info;
2126
2127         g->minors = 1;
2128         g->driverfs_dev = &drive->gendev;
2129         g->flags = GENHD_FL_CD | GENHD_FL_REMOVABLE;
2130         if (ide_cdrom_setup(drive)) {
2131                 ide_proc_unregister_driver(drive, &ide_cdrom_driver);
2132                 ide_cd_release(&info->kref);
2133                 goto failed;
2134         }
2135
2136         ide_cd_read_toc(drive, &sense);
2137         g->fops = &idecd_ops;
2138         g->flags |= GENHD_FL_REMOVABLE;
2139         add_disk(g);
2140         return 0;
2141
2142 out_free_cd:
2143         kfree(info);
2144 failed:
2145         return -ENODEV;
2146 }
2147
2148 static void __exit ide_cdrom_exit(void)
2149 {
2150         driver_unregister(&ide_cdrom_driver.gen_driver);
2151 }
2152
2153 static int __init ide_cdrom_init(void)
2154 {
2155         return driver_register(&ide_cdrom_driver.gen_driver);
2156 }
2157
2158 MODULE_ALIAS("ide:*m-cdrom*");
2159 MODULE_ALIAS("ide-cd");
2160 module_init(ide_cdrom_init);
2161 module_exit(ide_cdrom_exit);
2162 MODULE_LICENSE("GPL");