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