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, 2007-2009  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  *
  16  * Documentation:
  17  *      Mt. Fuji (SFF8090 version 4) and ATAPI (SFF-8020i rev 2.6) standards.
  18  *
  19  * For historical changelog please see:
  20  *      Documentation/ide/ChangeLog.ide-cd.1994-2004
  21  */
  22
  23 #define DRV_NAME "ide-cd"
  24 #define PFX DRV_NAME ": "
  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/seq_file.h>
  34 #include <linux/slab.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/errno.h>
  37 #include <linux/cdrom.h>
  38 #include <linux/ide.h>
  39 #include <linux/completion.h>
  40 #include <linux/mutex.h>
  41 #include <linux/bcd.h>
  42
  43 /* For SCSI -> ATAPI command conversion */
  44 #include <scsi/scsi.h>
  45
  46 #include <linux/irq.h>
  47 #include <linux/io.h>
  48 #include <asm/byteorder.h>
  49 #include <linux/uaccess.h>
  50 #include <asm/unaligned.h>
  51
  52 #include "ide-cd.h"
  53
  54 static DEFINE_MUTEX(idecd_ref_mutex);
  55
  56 static void ide_cd_release(struct device *);
  57
  58 static struct cdrom_info *ide_cd_get(struct gendisk *disk)
  59 {
  60         struct cdrom_info *cd = NULL;
  61
  62         mutex_lock(&idecd_ref_mutex);
  63         cd = ide_drv_g(disk, cdrom_info);
  64         if (cd) {
  65                 if (ide_device_get(cd->drive))
  66                         cd = NULL;
  67                 else
  68                         get_device(&cd->dev);
  69
  70         }
  71         mutex_unlock(&idecd_ref_mutex);
  72         return cd;
  73 }
  74
  75 static void ide_cd_put(struct cdrom_info *cd)
  76 {
  77         ide_drive_t *drive = cd->drive;
  78
  79         mutex_lock(&idecd_ref_mutex);
  80         put_device(&cd->dev);
  81         ide_device_put(drive);
  82         mutex_unlock(&idecd_ref_mutex);
  83 }
  84
  85 /*
  86  * Generic packet command support and error handling routines.
  87  */
  88
  89 /* Mark that we've seen a media change and invalidate our internal buffers. */
  90 static void cdrom_saw_media_change(ide_drive_t *drive)
  91 {
  92         drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;
  93         drive->atapi_flags &= ~IDE_AFLAG_TOC_VALID;
  94 }
  95
  96 static int cdrom_log_sense(ide_drive_t *drive, struct request *rq)
  97 {
  98         struct request_sense *sense = &drive->sense_data;
  99         int log = 0;
 100
 101         if (!sense || !rq || (rq->cmd_flags & REQ_QUIET))
 102                 return 0;
 103
 104         ide_debug_log(IDE_DBG_SENSE, "sense_key: 0x%x", sense->sense_key);
 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 {
 146         struct request_sense *sense = &drive->sense_data;
 147         struct cdrom_info *info = drive->driver_data;
 148         unsigned long sector;
 149         unsigned long bio_sectors;
 150
 151         ide_debug_log(IDE_DBG_SENSE, "error_code: 0x%x, sense_key: 0x%x",
 152                                      sense->error_code, sense->sense_key);
 153
 154         if (failed_command)
 155                 ide_debug_log(IDE_DBG_SENSE, "failed cmd: 0x%x",
 156                                              failed_command->cmd[0]);
 157
 158         if (!cdrom_log_sense(drive, failed_command))
 159                 return;
 160
 161         /*
 162          * If a read toc is executed for a CD-R or CD-RW medium where the first
 163          * toc has not been recorded yet, it will fail with 05/24/00 (which is a
 164          * confusing error)
 165          */
 166         if (failed_command && failed_command->cmd[0] == GPCMD_READ_TOC_PMA_ATIP)
 167                 if (sense->sense_key == 0x05 && sense->asc == 0x24)
 168                         return;
 169
 170         /* current error */
 171         if (sense->error_code == 0x70) {
 172                 switch (sense->sense_key) {
 173                 case MEDIUM_ERROR:
 174                 case VOLUME_OVERFLOW:
 175                 case ILLEGAL_REQUEST:
 176                         if (!sense->valid)
 177                                 break;
 178                         if (failed_command == NULL ||
 179                             failed_command->cmd_type != REQ_TYPE_FS)
 180                                 break;
 181                         sector = (sense->information[0] << 24) |
 182                                  (sense->information[1] << 16) |
 183                                  (sense->information[2] <<  8) |
 184                                  (sense->information[3]);
 185
 186                         if (queue_logical_block_size(drive->queue) == 2048)
 187                                 /* device sector size is 2K */
 188                                 sector <<= 2;
 189
 190                         bio_sectors = max(bio_sectors(failed_command->bio), 4U);
 191                         sector &= ~(bio_sectors - 1);
 192
 193                         /*
 194                          * The SCSI specification allows for the value
 195                          * returned by READ CAPACITY to be up to 75 2K
 196                          * sectors past the last readable block.
 197                          * Therefore, if we hit a medium error within the
 198                          * last 75 2K sectors, we decrease the saved size
 199                          * value.
 200                          */
 201                         if (sector < get_capacity(info->disk) &&
 202                             drive->probed_capacity - sector < 4 * 75)
 203                                 set_capacity(info->disk, sector);
 204                 }
 205         }
 206
 207         ide_cd_log_error(drive->name, failed_command, sense);
 208 }
 209
 210 static void ide_cd_complete_failed_rq(ide_drive_t *drive, struct request *rq)
 211 {
 212         /*
 213          * For REQ_TYPE_SENSE, "rq->special" points to the original
 214          * failed request.  Also, the sense data should be read
 215          * directly from rq which might be different from the original
 216          * sense buffer if it got copied during mapping.
 217          */
 218         struct request *failed = (struct request *)rq->special;
 219         void *sense = bio_data(rq->bio);
 220
 221         if (failed) {
 222                 if (failed->sense) {
 223                         /*
 224                          * Sense is always read into drive->sense_data.
 225                          * Copy back if the failed request has its
 226                          * sense pointer set.
 227                          */
 228                         memcpy(failed->sense, sense, 18);
 229                         failed->sense_len = rq->sense_len;
 230                 }
 231                 cdrom_analyze_sense_data(drive, failed);
 232
 233                 if (ide_end_rq(drive, failed, -EIO, blk_rq_bytes(failed)))
 234                         BUG();
 235         } else
 236                 cdrom_analyze_sense_data(drive, NULL);
 237 }
 238
 239
 240 /*
 241  * Allow the drive 5 seconds to recover; some devices will return NOT_READY
 242  * while flushing data from cache.
 243  *
 244  * returns: 0 failed (write timeout expired)
 245  *          1 success
 246  */
 247 static int ide_cd_breathe(ide_drive_t *drive, struct request *rq)
 248 {
 249
 250         struct cdrom_info *info = drive->driver_data;
 251
 252         if (!rq->errors)
 253                 info->write_timeout = jiffies + ATAPI_WAIT_WRITE_BUSY;
 254
 255         rq->errors = 1;
 256
 257         if (time_after(jiffies, info->write_timeout))
 258                 return 0;
 259         else {
 260                 struct request_queue *q = drive->queue;
 261                 unsigned long flags;
 262
 263                 /*
 264                  * take a breather relying on the unplug timer to kick us again
 265                  */
 266
 267                 spin_lock_irqsave(q->queue_lock, flags);
 268                 blk_plug_device(q);
 269                 spin_unlock_irqrestore(q->queue_lock, flags);
 270
 271                 return 1;
 272         }
 273 }
 274
 275 /**
 276  * Returns:
 277  * 0: if the request should be continued.
 278  * 1: if the request will be going through error recovery.
 279  * 2: if the request should be ended.
 280  */
 281 static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
 282 {
 283         ide_hwif_t *hwif = drive->hwif;
 284         struct request *rq = hwif->rq;
 285         int err, sense_key, do_end_request = 0;
 286
 287         /* get the IDE error register */
 288         err = ide_read_error(drive);
 289         sense_key = err >> 4;
 290
 291         ide_debug_log(IDE_DBG_RQ, "cmd: 0x%x, rq->cmd_type: 0x%x, err: 0x%x, "
 292                                   "stat 0x%x",
 293                                   rq->cmd[0], rq->cmd_type, err, stat);
 294
 295         if (rq->cmd_type == REQ_TYPE_SENSE) {
 296                 /*
 297                  * We got an error trying to get sense info from the drive
 298                  * (probably while trying to recover from a former error).
 299                  * Just give up.
 300                  */
 301                 rq->cmd_flags |= REQ_FAILED;
 302                 return 2;
 303         }
 304
 305         /* if we have an error, pass CHECK_CONDITION as the SCSI status byte */
 306         if (rq->cmd_type == REQ_TYPE_BLOCK_PC && !rq->errors)
 307                 rq->errors = SAM_STAT_CHECK_CONDITION;
 308
 309         if (blk_noretry_request(rq))
 310                 do_end_request = 1;
 311
 312         switch (sense_key) {
 313         case NOT_READY:
 314                 if (rq->cmd_type == REQ_TYPE_FS && rq_data_dir(rq) == WRITE) {
 315                         if (ide_cd_breathe(drive, rq))
 316                                 return 1;
 317                 } else {
 318                         cdrom_saw_media_change(drive);
 319
 320                         if (rq->cmd_type == REQ_TYPE_FS &&
 321                             !(rq->cmd_flags & REQ_QUIET)) {
 322                                 printk(KERN_ERR PFX "%s: tray open\n",
 323                                         drive->name);
 324                 }
 325                 do_end_request = 1;
 326                 break;
 327         case UNIT_ATTENTION:
 328                 cdrom_saw_media_change(drive);
 329
 330                 if (rq->cmd_type != REQ_TYPE_FS)
 331                         return 0;
 332
 333                 /*
 334                  * Arrange to retry the request but be sure to give up if we've
 335                  * retried too many times.
 336                  */
 337                 if (++rq->errors > ERROR_MAX)
 338                         do_end_request = 1;
 339                 break;
 340         case ILLEGAL_REQUEST:
 341                 /*
 342                  * Don't print error message for this condition -- SFF8090i
 343                  * indicates that 5/24/00 is the correct response to a request
 344                  * to close the tray if the drive doesn't have that capability.
 345                  *
 346                  * cdrom_log_sense() knows this!
 347                  */
 348                 if (rq->cmd[0] == GPCMD_START_STOP_UNIT)
 349                         break;
 350                 /* fall-through */
 351         case DATA_PROTECT:
 352                 /*
 353                  * No point in retrying after an illegal request or data
 354                  * protect error.
 355                  */
 356                 if (!(rq->cmd_flags & REQ_QUIET))
 357                         ide_dump_status(drive, "command error", stat);
 358                 do_end_request = 1;
 359                 break;
 360         case MEDIUM_ERROR:
 361                 /*
 362                  * No point in re-trying a zillion times on a bad sector.
 363                  * If we got here the error is not correctable.
 364                  */
 365                 if (!(rq->cmd_flags & REQ_QUIET))
 366                         ide_dump_status(drive, "media error "
 367                                         "(bad sector)", stat);
 368                 do_end_request = 1;
 369                 break;
 370         case BLANK_CHECK:
 371                 /* disk appears blank? */
 372                 if (!(rq->cmd_flags & REQ_QUIET))
 373                         ide_dump_status(drive, "media error (blank)",
 374                                         stat);
 375                 do_end_request = 1;
 376                 break;
 377         default:
 378                 if (req->cmd_type != REQ_TYPE_FS)
 379                         break;
 380                 if (err & ~ATA_ABORTED) {
 381                         /* go to the default handler for other errors */
 382                         ide_error(drive, "cdrom_decode_status", stat);
 383                         return 1;
 384                 } else if (++rq->errors > ERROR_MAX)
 385                         /* we've racked up too many retries, abort */
 386                         do_end_request = 1;
 387         }
 388
 389         if (rq->cmd_type != REQ_TYPE_FS) {
 390                 rq->cmd_flags |= REQ_FAILED;
 391                 do_end_request = 1;
 392         }
 393
 394         /*
 395          * End a request through request sense analysis when we have sense data.
 396          * We need this in order to perform end of media processing.
 397          */
 398         if (do_end_request)
 399                 goto end_request;
 400
 401         /* if we got a CHECK_CONDITION status, queue a request sense command */
 402         if (stat & ATA_ERR)
 403                 return ide_queue_sense_rq(drive, NULL) ? 2 : 1;
 404         return 1;
 405
 406 end_request:
 407         if (stat & ATA_ERR) {
 408                 hwif->rq = NULL;
 409                 return ide_queue_sense_rq(drive, rq) ? 2 : 1;
 410         } else
 411                 return 2;
 412 }
 413
 414 static void ide_cd_request_sense_fixup(ide_drive_t *drive, struct ide_cmd *cmd)
 415 {
 416         struct request *rq = cmd->rq;
 417
 418         ide_debug_log(IDE_DBG_FUNC, "rq->cmd[0]: 0x%x", rq->cmd[0]);
 419
 420         /*
 421          * Some of the trailing request sense fields are optional,
 422          * and some drives don't send them.  Sigh.
 423          */
 424         if (rq->cmd[0] == GPCMD_REQUEST_SENSE &&
 425             cmd->nleft > 0 && cmd->nleft <= 5)
 426                 cmd->nleft = 0;
 427 }
 428
 429 int ide_cd_queue_pc(ide_drive_t *drive, const unsigned char *cmd,
 430                     int write, void *buffer, unsigned *bufflen,
 431                     struct request_sense *sense, int timeout,
 432                     unsigned int cmd_flags)
 433 {
 434         struct cdrom_info *info = drive->driver_data;
 435         struct request_sense local_sense;
 436         int retries = 10;
 437         unsigned int flags = 0;
 438
 439         if (!sense)
 440                 sense = &local_sense;
 441
 442         ide_debug_log(IDE_DBG_PC, "cmd[0]: 0x%x, write: 0x%x, timeout: %d, "
 443                                   "cmd_flags: 0x%x",
 444                                   cmd[0], write, timeout, cmd_flags);
 445
 446         /* start of retry loop */
 447         do {
 448                 struct request *rq;
 449                 int error;
 450
 451                 rq = blk_get_request(drive->queue, write, __GFP_WAIT);
 452
 453                 memcpy(rq->cmd, cmd, BLK_MAX_CDB);
 454                 rq->cmd_type = REQ_TYPE_ATA_PC;
 455                 rq->sense = sense;
 456                 rq->cmd_flags |= cmd_flags;
 457                 rq->timeout = timeout;
 458                 if (buffer) {
 459                         error = blk_rq_map_kern(drive->queue, rq, buffer,
 460                                                 *bufflen, GFP_NOIO);
 461                         if (error) {
 462                                 blk_put_request(rq);
 463                                 return error;
 464                         }
 465                 }
 466
 467                 error = blk_execute_rq(drive->queue, info->disk, rq, 0);
 468
 469                 if (buffer)
 470                         *bufflen = rq->resid_len;
 471
 472                 flags = rq->cmd_flags;
 473                 blk_put_request(rq);
 474
 475                 /*
 476                  * FIXME: we should probably abort/retry or something in case of
 477                  * failure.
 478                  */
 479                 if (flags & REQ_FAILED) {
 480                         /*
 481                          * The request failed.  Retry if it was due to a unit
 482                          * attention status (usually means media was changed).
 483                          */
 484                         struct request_sense *reqbuf = sense;
 485
 486                         if (reqbuf->sense_key == UNIT_ATTENTION)
 487                                 cdrom_saw_media_change(drive);
 488                         else if (reqbuf->sense_key == NOT_READY &&
 489                                  reqbuf->asc == 4 && reqbuf->ascq != 4) {
 490                                 /*
 491                                  * The drive is in the process of loading
 492                                  * a disk.  Retry, but wait a little to give
 493                                  * the drive time to complete the load.
 494                                  */
 495                                 ssleep(2);
 496                         } else {
 497                                 /* otherwise, don't retry */
 498                                 retries = 0;
 499                         }
 500                         --retries;
 501                 }
 502
 503                 /* end of retry loop */
 504         } while ((flags & REQ_FAILED) && retries >= 0);
 505
 506         /* return an error if the command failed */
 507         return (flags & REQ_FAILED) ? -EIO : 0;
 508 }
 509
 510 static void ide_cd_error_cmd(ide_drive_t *drive, struct ide_cmd *cmd)
 511 {
 512         unsigned int nr_bytes = cmd->nbytes - cmd->nleft;
 513
 514         if (cmd->tf_flags & IDE_TFLAG_WRITE)
 515                 nr_bytes -= cmd->last_xfer_len;
 516
 517         if (nr_bytes > 0)
 518                 ide_complete_rq(drive, 0, nr_bytes);
 519 }
 520
 521 static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
 522 {
 523         ide_hwif_t *hwif = drive->hwif;
 524         struct ide_cmd *cmd = &hwif->cmd;
 525         struct request *rq = hwif->rq;
 526         ide_expiry_t *expiry = NULL;
 527         int dma_error = 0, dma, thislen, uptodate = 0;
 528         int write = (rq_data_dir(rq) == WRITE) ? 1 : 0, rc = 0;
 529         int sense = (rq->cmd_type == REQ_TYPE_SENSE);
 530         unsigned int timeout;
 531         u16 len;
 532         u8 ireason, stat;
 533
 534         ide_debug_log(IDE_DBG_PC, "cmd: 0x%x, write: 0x%x", rq->cmd[0], write);
 535
 536         /* check for errors */
 537         dma = drive->dma;
 538         if (dma) {
 539                 drive->dma = 0;
 540                 drive->waiting_for_dma = 0;
 541                 dma_error = hwif->dma_ops->dma_end(drive);
 542                 ide_dma_unmap_sg(drive, cmd);
 543                 if (dma_error) {
 544                         printk(KERN_ERR PFX "%s: DMA %s error\n", drive->name,
 545                                         write ? "write" : "read");
 546                         ide_dma_off(drive);
 547                 }
 548         }
 549
 550         /* check status */
 551         stat = hwif->tp_ops->read_status(hwif);
 552
 553         if (!OK_STAT(stat, 0, BAD_R_STAT)) {
 554                 rc = cdrom_decode_status(drive, stat);
 555                 if (rc) {
 556                         if (rc == 2)
 557                                 goto out_end;
 558                         return ide_stopped;
 559                 }
 560         }
 561
 562         /* using dma, transfer is complete now */
 563         if (dma) {
 564                 if (dma_error)
 565                         return ide_error(drive, "dma error", stat);
 566                 uptodate = 1;
 567                 goto out_end;
 568         }
 569
 570         ide_read_bcount_and_ireason(drive, &len, &ireason);
 571
 572         thislen = (rq->cmd_type == REQ_TYPE_FS) ? len : cmd->nleft;
 573         if (thislen > len)
 574                 thislen = len;
 575
 576         ide_debug_log(IDE_DBG_PC, "DRQ: stat: 0x%x, thislen: %d",
 577                                   stat, thislen);
 578
 579         /* If DRQ is clear, the command has completed. */
 580         if ((stat & ATA_DRQ) == 0) {
 581                 if (rq->cmd_type == REQ_TYPE_FS) {
 582                         /*
 583                          * If we're not done reading/writing, complain.
 584                          * Otherwise, complete the command normally.
 585                          */
 586                         uptodate = 1;
 587                         if (cmd->nleft > 0) {
 588                                 printk(KERN_ERR PFX "%s: %s: data underrun "
 589                                         "(%u bytes)\n", drive->name, __func__,
 590                                         cmd->nleft);
 591                                 if (!write)
 592                                         rq->cmd_flags |= REQ_FAILED;
 593                                 uptodate = 0;
 594                         }
 595                 } else if (rq->cmd_type != REQ_TYPE_BLOCK_PC) {
 596                         ide_cd_request_sense_fixup(drive, cmd);
 597
 598                         uptodate = cmd->nleft ? 0 : 1;
 599
 600                         /*
 601                          * suck out the remaining bytes from the drive in an
 602                          * attempt to complete the data xfer. (see BZ#13399)
 603                          */
 604                         if (!(stat & ATA_ERR) && !uptodate && thislen) {
 605                                 ide_pio_bytes(drive, cmd, write, thislen);
 606                                 uptodate = cmd->nleft ? 0 : 1;
 607                         }
 608
 609                         if (!uptodate)
 610                                 rq->cmd_flags |= REQ_FAILED;
 611                 }
 612                 goto out_end;
 613         }
 614
 615         rc = ide_check_ireason(drive, rq, len, ireason, write);
 616         if (rc)
 617                 goto out_end;
 618
 619         cmd->last_xfer_len = 0;
 620
 621         ide_debug_log(IDE_DBG_PC, "data transfer, rq->cmd_type: 0x%x, "
 622                                   "ireason: 0x%x",
 623                                   rq->cmd_type, ireason);
 624
 625         /* transfer data */
 626         while (thislen > 0) {
 627                 int blen = min_t(int, thislen, cmd->nleft);
 628
 629                 if (cmd->nleft == 0)
 630                         break;
 631
 632                 ide_pio_bytes(drive, cmd, write, blen);
 633                 cmd->last_xfer_len += blen;
 634
 635                 thislen -= blen;
 636                 len -= blen;
 637
 638                 if (sense && write == 0)
 639                         rq->sense_len += blen;
 640         }
 641
 642         /* pad, if necessary */
 643         if (len > 0) {
 644                 if (rq->cmd_type != REQ_TYPE_FS || write == 0)
 645                         ide_pad_transfer(drive, write, len);
 646                 else {
 647                         printk(KERN_ERR PFX "%s: confused, missing data\n",
 648                                 drive->name);
 649                         blk_dump_rq_flags(rq, "cdrom_newpc_intr");
 650                 }
 651         }
 652
 653         if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
 654                 timeout = rq->timeout;
 655         } else {
 656                 timeout = ATAPI_WAIT_PC;
 657                 if (rq->cmd_type != REQ_TYPE_FS)
 658                         expiry = ide_cd_expiry;
 659         }
 660
 661         hwif->expiry = expiry;
 662         ide_set_handler(drive, cdrom_newpc_intr, timeout);
 663         return ide_started;
 664
 665 out_end:
 666         if (rq->cmd_type == REQ_TYPE_BLOCK_PC && rc == 0) {
 667                 rq->resid_len = 0;
 668                 blk_end_request_all(rq, 0);
 669                 hwif->rq = NULL;
 670         } else {
 671                 if (sense && uptodate)
 672                         ide_cd_complete_failed_rq(drive, rq);
 673
 674                 if (rq->cmd_type == REQ_TYPE_FS) {
 675                         if (cmd->nleft == 0)
 676                                 uptodate = 1;
 677                 } else {
 678                         if (uptodate <= 0 && rq->errors == 0)
 679                                 rq->errors = -EIO;
 680                 }
 681
 682                 if (uptodate == 0 && rq->bio)
 683                         ide_cd_error_cmd(drive, cmd);
 684
 685                 /* make sure it's fully ended */
 686                 if (rq->cmd_type != REQ_TYPE_FS) {
 687                         rq->resid_len -= cmd->nbytes - cmd->nleft;
 688                         if (uptodate == 0 && (cmd->tf_flags & IDE_TFLAG_WRITE))
 689                                 rq->resid_len += cmd->last_xfer_len;
 690                 }
 691
 692                 ide_complete_rq(drive, uptodate ? 0 : -EIO, blk_rq_bytes(rq));
 693
 694                 if (sense && rc == 2)
 695                         ide_error(drive, "request sense failure", stat);
 696         }
 697         return ide_stopped;
 698 }
 699
 700 static ide_startstop_t cdrom_start_rw(ide_drive_t *drive, struct request *rq)
 701 {
 702         struct cdrom_info *cd = drive->driver_data;
 703         struct request_queue *q = drive->queue;
 704         int write = rq_data_dir(rq) == WRITE;
 705         unsigned short sectors_per_frame =
 706                 queue_logical_block_size(q) >> SECTOR_BITS;
 707
 708         ide_debug_log(IDE_DBG_RQ, "rq->cmd[0]: 0x%x, rq->cmd_flags: 0x%x, "
 709                                   "secs_per_frame: %u",
 710                                   rq->cmd[0], rq->cmd_flags, sectors_per_frame);
 711
 712         if (write) {
 713                 /* disk has become write protected */
 714                 if (get_disk_ro(cd->disk))
 715                         return ide_stopped;
 716         } else {
 717                 /*
 718                  * We may be retrying this request after an error.  Fix up any
 719                  * weirdness which might be present in the request packet.
 720                  */
 721                 q->prep_rq_fn(q, rq);
 722         }
 723
 724         /* fs requests *must* be hardware frame aligned */
 725         if ((blk_rq_sectors(rq) & (sectors_per_frame - 1)) ||
 726             (blk_rq_pos(rq) & (sectors_per_frame - 1)))
 727                 return ide_stopped;
 728
 729         /* use DMA, if possible */
 730         drive->dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
 731
 732         if (write)
 733                 cd->devinfo.media_written = 1;
 734
 735         rq->timeout = ATAPI_WAIT_PC;
 736
 737         return ide_started;
 738 }
 739
 740 static void cdrom_do_block_pc(ide_drive_t *drive, struct request *rq)
 741 {
 742
 743         ide_debug_log(IDE_DBG_PC, "rq->cmd[0]: 0x%x, rq->cmd_type: 0x%x",
 744                                   rq->cmd[0], rq->cmd_type);
 745
 746         if (rq->cmd_type == REQ_TYPE_BLOCK_PC)
 747                 rq->cmd_flags |= REQ_QUIET;
 748         else
 749                 rq->cmd_flags &= ~REQ_FAILED;
 750
 751         drive->dma = 0;
 752
 753         /* sg request */
 754         if (rq->bio) {
 755                 struct request_queue *q = drive->queue;
 756                 char *buf = bio_data(rq->bio);
 757                 unsigned int alignment;
 758
 759                 drive->dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
 760
 761                 /*
 762                  * check if dma is safe
 763                  *
 764                  * NOTE! The "len" and "addr" checks should possibly have
 765                  * separate masks.
 766                  */
 767                 alignment = queue_dma_alignment(q) | q->dma_pad_mask;
 768                 if ((unsigned long)buf & alignment
 769                     || blk_rq_bytes(rq) & q->dma_pad_mask
 770                     || object_is_on_stack(buf))
 771                         drive->dma = 0;
 772         }
 773 }
 774
 775 static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
 776                                         sector_t block)
 777 {
 778         struct ide_cmd cmd;
 779         int uptodate = 0, nsectors;
 780
 781         ide_debug_log(IDE_DBG_RQ, "cmd: 0x%x, block: %llu",
 782                                   rq->cmd[0], (unsigned long long)block);
 783
 784         if (drive->debug_mask & IDE_DBG_RQ)
 785                 blk_dump_rq_flags(rq, "ide_cd_do_request");
 786
 787         switch (rq->cmd_type) {
 788         case REQ_TYPE_FS:
 789                 if (cdrom_start_rw(drive, rq) == ide_stopped)
 790                         goto out_end;
 791                 break;
 792         case REQ_TYPE_SENSE:
 793         case REQ_TYPE_BLOCK_PC:
 794         case REQ_TYPE_ATA_PC:
 795                 if (!rq->timeout)
 796                         rq->timeout = ATAPI_WAIT_PC;
 797
 798                 cdrom_do_block_pc(drive, rq);
 799                 break;
 800         case REQ_TYPE_SPECIAL:
 801                 /* right now this can only be a reset... */
 802                 uptodate = 1;
 803                 goto out_end;
 804         default:
 805                 BUG();
 806         }
 807
 808         /* prepare sense request for this command */
 809         ide_prep_sense(drive, rq);
 810
 811         memset(&cmd, 0, sizeof(cmd));
 812
 813         if (rq_data_dir(rq))
 814                 cmd.tf_flags |= IDE_TFLAG_WRITE;
 815
 816         cmd.rq = rq;
 817
 818         if (rq->cmd_type == REQ_TYPE_FS || blk_rq_bytes(rq)) {
 819                 ide_init_sg_cmd(&cmd, blk_rq_bytes(rq));
 820                 ide_map_sg(drive, &cmd);
 821         }
 822
 823         return ide_issue_pc(drive, &cmd);
 824 out_end:
 825         nsectors = blk_rq_sectors(rq);
 826
 827         if (nsectors == 0)
 828                 nsectors = 1;
 829
 830         ide_complete_rq(drive, uptodate ? 0 : -EIO, nsectors << 9);
 831
 832         return ide_stopped;
 833 }
 834
 835 /*
 836  * Ioctl handling.
 837  *
 838  * Routines which queue packet commands take as a final argument a pointer to a
 839  * request_sense struct. If execution of the command results in an error with a
 840  * CHECK CONDITION status, this structure will be filled with the results of the
 841  * subsequent request sense command. The pointer can also be NULL, in which case
 842  * no sense information is returned.
 843  */
 844 static void msf_from_bcd(struct atapi_msf *msf)
 845 {
 846         msf->minute = bcd2bin(msf->minute);
 847         msf->second = bcd2bin(msf->second);
 848         msf->frame  = bcd2bin(msf->frame);
 849 }
 850
 851 int cdrom_check_status(ide_drive_t *drive, struct request_sense *sense)
 852 {
 853         struct cdrom_info *info = drive->driver_data;
 854         struct cdrom_device_info *cdi = &info->devinfo;
 855         unsigned char cmd[BLK_MAX_CDB];
 856
 857         ide_debug_log(IDE_DBG_FUNC, "enter");
 858
 859         memset(cmd, 0, BLK_MAX_CDB);
 860         cmd[0] = GPCMD_TEST_UNIT_READY;
 861
 862         /*
 863          * Sanyo 3 CD changer uses byte 7 of TEST_UNIT_READY to switch CDs
 864          * instead of supporting the LOAD_UNLOAD opcode.
 865          */
 866         cmd[7] = cdi->sanyo_slot % 3;
 867
 868         return ide_cd_queue_pc(drive, cmd, 0, NULL, NULL, sense, 0, REQ_QUIET);
 869 }
 870
 871 static int cdrom_read_capacity(ide_drive_t *drive, unsigned long *capacity,
 872                                unsigned long *sectors_per_frame,
 873                                struct request_sense *sense)
 874 {
 875         struct {
 876                 __be32 lba;
 877                 __be32 blocklen;
 878         } capbuf;
 879
 880         int stat;
 881         unsigned char cmd[BLK_MAX_CDB];
 882         unsigned len = sizeof(capbuf);
 883         u32 blocklen;
 884
 885         ide_debug_log(IDE_DBG_FUNC, "enter");
 886
 887         memset(cmd, 0, BLK_MAX_CDB);
 888         cmd[0] = GPCMD_READ_CDVD_CAPACITY;
 889
 890         stat = ide_cd_queue_pc(drive, cmd, 0, &capbuf, &len, sense, 0,
 891                                REQ_QUIET);
 892         if (stat)
 893                 return stat;
 894
 895         /*
 896          * Sanity check the given block size, in so far as making
 897          * sure the sectors_per_frame we give to the caller won't
 898          * end up being bogus.
 899          */
 900         blocklen = be32_to_cpu(capbuf.blocklen);
 901         blocklen = (blocklen >> SECTOR_BITS) << SECTOR_BITS;
 902         switch (blocklen) {
 903         case 512:
 904         case 1024:
 905         case 2048:
 906         case 4096:
 907                 break;
 908         default:
 909                 printk_once(KERN_ERR PFX "%s: weird block size %u; "
 910                                 "setting default block size to 2048\n",
 911                                 drive->name, blocklen);
 912                 blocklen = 2048;
 913                 break;
 914         }
 915
 916         *capacity = 1 + be32_to_cpu(capbuf.lba);
 917         *sectors_per_frame = blocklen >> SECTOR_BITS;
 918
 919         ide_debug_log(IDE_DBG_PROBE, "cap: %lu, sectors_per_frame: %lu",
 920                                      *capacity, *sectors_per_frame);
 921
 922         return 0;
 923 }
 924
 925 static int cdrom_read_tocentry(ide_drive_t *drive, int trackno, int msf_flag,
 926                                 int format, char *buf, int buflen,
 927                                 struct request_sense *sense)
 928 {
 929         unsigned char cmd[BLK_MAX_CDB];
 930
 931         ide_debug_log(IDE_DBG_FUNC, "enter");
 932
 933         memset(cmd, 0, BLK_MAX_CDB);
 934
 935         cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
 936         cmd[6] = trackno;
 937         cmd[7] = (buflen >> 8);
 938         cmd[8] = (buflen & 0xff);
 939         cmd[9] = (format << 6);
 940
 941         if (msf_flag)
 942                 cmd[1] = 2;
 943
 944         return ide_cd_queue_pc(drive, cmd, 0, buf, &buflen, sense, 0, REQ_QUIET);
 945 }
 946
 947 /* Try to read the entire TOC for the disk into our internal buffer. */
 948 int ide_cd_read_toc(ide_drive_t *drive, struct request_sense *sense)
 949 {
 950         int stat, ntracks, i;
 951         struct cdrom_info *info = drive->driver_data;
 952         struct cdrom_device_info *cdi = &info->devinfo;
 953         struct atapi_toc *toc = info->toc;
 954         struct {
 955                 struct atapi_toc_header hdr;
 956                 struct atapi_toc_entry  ent;
 957         } ms_tmp;
 958         long last_written;
 959         unsigned long sectors_per_frame = SECTORS_PER_FRAME;
 960
 961         ide_debug_log(IDE_DBG_FUNC, "enter");
 962
 963         if (toc == NULL) {
 964                 /* try to allocate space */
 965                 toc = kmalloc(sizeof(struct atapi_toc), GFP_KERNEL);
 966                 if (toc == NULL) {
 967                         printk(KERN_ERR PFX "%s: No cdrom TOC buffer!\n",
 968                                         drive->name);
 969                         return -ENOMEM;
 970                 }
 971                 info->toc = toc;
 972         }
 973
 974         /*
 975          * Check to see if the existing data is still valid. If it is,
 976          * just return.
 977          */
 978         (void) cdrom_check_status(drive, sense);
 979
 980         if (drive->atapi_flags & IDE_AFLAG_TOC_VALID)
 981                 return 0;
 982
 983         /* try to get the total cdrom capacity and sector size */
 984         stat = cdrom_read_capacity(drive, &toc->capacity, &sectors_per_frame,
 985                                    sense);
 986         if (stat)
 987                 toc->capacity = 0x1fffff;
 988
 989         set_capacity(info->disk, toc->capacity * sectors_per_frame);
 990         /* save a private copy of the TOC capacity for error handling */
 991         drive->probed_capacity = toc->capacity * sectors_per_frame;
 992
 993         blk_queue_logical_block_size(drive->queue,
 994                                      sectors_per_frame << SECTOR_BITS);
 995
 996         /* first read just the header, so we know how long the TOC is */
 997         stat = cdrom_read_tocentry(drive, 0, 1, 0, (char *) &toc->hdr,
 998                                     sizeof(struct atapi_toc_header), sense);
 999         if (stat)
1000                 return stat;
1001
1002         if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
1003                 toc->hdr.first_track = bcd2bin(toc->hdr.first_track);
1004                 toc->hdr.last_track  = bcd2bin(toc->hdr.last_track);
1005         }
1006
1007         ntracks = toc->hdr.last_track - toc->hdr.first_track + 1;
1008         if (ntracks <= 0)
1009                 return -EIO;
1010         if (ntracks > MAX_TRACKS)
1011                 ntracks = MAX_TRACKS;
1012
1013         /* now read the whole schmeer */
1014         stat = cdrom_read_tocentry(drive, toc->hdr.first_track, 1, 0,
1015                                   (char *)&toc->hdr,
1016                                    sizeof(struct atapi_toc_header) +
1017                                    (ntracks + 1) *
1018                                    sizeof(struct atapi_toc_entry), sense);
1019
1020         if (stat && toc->hdr.first_track > 1) {
1021                 /*
1022                  * Cds with CDI tracks only don't have any TOC entries, despite
1023                  * of this the returned values are
1024                  * first_track == last_track = number of CDI tracks + 1,
1025                  * so that this case is indistinguishable from the same layout
1026                  * plus an additional audio track. If we get an error for the
1027                  * regular case, we assume a CDI without additional audio
1028                  * tracks. In this case the readable TOC is empty (CDI tracks
1029                  * are not included) and only holds the Leadout entry.
1030                  *
1031                  * Heiko Eißfeldt.
1032                  */
1033                 ntracks = 0;
1034                 stat = cdrom_read_tocentry(drive, CDROM_LEADOUT, 1, 0,
1035                                            (char *)&toc->hdr,
1036                                            sizeof(struct atapi_toc_header) +
1037                                            (ntracks + 1) *
1038                                            sizeof(struct atapi_toc_entry),
1039                                            sense);
1040                 if (stat)
1041                         return stat;
1042
1043                 if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
1044                         toc->hdr.first_track = (u8)bin2bcd(CDROM_LEADOUT);
1045                         toc->hdr.last_track = (u8)bin2bcd(CDROM_LEADOUT);
1046                 } else {
1047                         toc->hdr.first_track = CDROM_LEADOUT;
1048                         toc->hdr.last_track = CDROM_LEADOUT;
1049                 }
1050         }
1051
1052         if (stat)
1053                 return stat;
1054
1055         toc->hdr.toc_length = be16_to_cpu(toc->hdr.toc_length);
1056
1057         if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
1058                 toc->hdr.first_track = bcd2bin(toc->hdr.first_track);
1059                 toc->hdr.last_track  = bcd2bin(toc->hdr.last_track);
1060         }
1061
1062         for (i = 0; i <= ntracks; i++) {
1063                 if (drive->atapi_flags & IDE_AFLAG_TOCADDR_AS_BCD) {
1064                         if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD)
1065                                 toc->ent[i].track = bcd2bin(toc->ent[i].track);
1066                         msf_from_bcd(&toc->ent[i].addr.msf);
1067                 }
1068                 toc->ent[i].addr.lba = msf_to_lba(toc->ent[i].addr.msf.minute,
1069                                                   toc->ent[i].addr.msf.second,
1070                                                   toc->ent[i].addr.msf.frame);
1071         }
1072
1073         if (toc->hdr.first_track != CDROM_LEADOUT) {
1074                 /* read the multisession information */
1075                 stat = cdrom_read_tocentry(drive, 0, 0, 1, (char *)&ms_tmp,
1076                                            sizeof(ms_tmp), sense);
1077                 if (stat)
1078                         return stat;
1079
1080                 toc->last_session_lba = be32_to_cpu(ms_tmp.ent.addr.lba);
1081         } else {
1082                 ms_tmp.hdr.last_track = CDROM_LEADOUT;
1083                 ms_tmp.hdr.first_track = ms_tmp.hdr.last_track;
1084                 toc->last_session_lba = msf_to_lba(0, 2, 0); /* 0m 2s 0f */
1085         }
1086
1087         if (drive->atapi_flags & IDE_AFLAG_TOCADDR_AS_BCD) {
1088                 /* re-read multisession information using MSF format */
1089                 stat = cdrom_read_tocentry(drive, 0, 1, 1, (char *)&ms_tmp,
1090                                            sizeof(ms_tmp), sense);
1091                 if (stat)
1092                         return stat;
1093
1094                 msf_from_bcd(&ms_tmp.ent.addr.msf);
1095                 toc->last_session_lba = msf_to_lba(ms_tmp.ent.addr.msf.minute,
1096                                                    ms_tmp.ent.addr.msf.second,
1097                                                    ms_tmp.ent.addr.msf.frame);
1098         }
1099
1100         toc->xa_flag = (ms_tmp.hdr.first_track != ms_tmp.hdr.last_track);
1101
1102         /* now try to get the total cdrom capacity */
1103         stat = cdrom_get_last_written(cdi, &last_written);
1104         if (!stat && (last_written > toc->capacity)) {
1105                 toc->capacity = last_written;
1106                 set_capacity(info->disk, toc->capacity * sectors_per_frame);
1107                 drive->probed_capacity = toc->capacity * sectors_per_frame;
1108         }
1109
1110         /* Remember that we've read this stuff. */
1111         drive->atapi_flags |= IDE_AFLAG_TOC_VALID;
1112
1113         return 0;
1114 }
1115
1116 int ide_cdrom_get_capabilities(ide_drive_t *drive, u8 *buf)
1117 {
1118         struct cdrom_info *info = drive->driver_data;
1119         struct cdrom_device_info *cdi = &info->devinfo;
1120         struct packet_command cgc;
1121         int stat, attempts = 3, size = ATAPI_CAPABILITIES_PAGE_SIZE;
1122
1123         ide_debug_log(IDE_DBG_FUNC, "enter");
1124
1125         if ((drive->atapi_flags & IDE_AFLAG_FULL_CAPS_PAGE) == 0)
1126                 size -= ATAPI_CAPABILITIES_PAGE_PAD_SIZE;
1127
1128         init_cdrom_command(&cgc, buf, size, CGC_DATA_UNKNOWN);
1129         do {
1130                 /* we seem to get stat=0x01,err=0x00 the first time (??) */
1131                 stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1132                 if (!stat)
1133                         break;
1134         } while (--attempts);
1135         return stat;
1136 }
1137
1138 void ide_cdrom_update_speed(ide_drive_t *drive, u8 *buf)
1139 {
1140         struct cdrom_info *cd = drive->driver_data;
1141         u16 curspeed, maxspeed;
1142
1143         ide_debug_log(IDE_DBG_FUNC, "enter");
1144
1145         if (drive->atapi_flags & IDE_AFLAG_LE_SPEED_FIELDS) {
1146                 curspeed = le16_to_cpup((__le16 *)&buf[8 + 14]);
1147                 maxspeed = le16_to_cpup((__le16 *)&buf[8 + 8]);
1148         } else {
1149                 curspeed = be16_to_cpup((__be16 *)&buf[8 + 14]);
1150                 maxspeed = be16_to_cpup((__be16 *)&buf[8 + 8]);
1151         }
1152
1153         ide_debug_log(IDE_DBG_PROBE, "curspeed: %u, maxspeed: %u",
1154                                      curspeed, maxspeed);
1155
1156         cd->current_speed = DIV_ROUND_CLOSEST(curspeed, 176);
1157         cd->max_speed = DIV_ROUND_CLOSEST(maxspeed, 176);
1158 }
1159
1160 #define IDE_CD_CAPABILITIES \
1161         (CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK | CDC_SELECT_SPEED | \
1162          CDC_SELECT_DISC | CDC_MULTI_SESSION | CDC_MCN | CDC_MEDIA_CHANGED | \
1163          CDC_PLAY_AUDIO | CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R | \
1164          CDC_CD_RW | CDC_DVD | CDC_DVD_R | CDC_DVD_RAM | CDC_GENERIC_PACKET | \
1165          CDC_MO_DRIVE | CDC_MRW | CDC_MRW_W | CDC_RAM)
1166
1167 static struct cdrom_device_ops ide_cdrom_dops = {
1168         .open                   = ide_cdrom_open_real,
1169         .release                = ide_cdrom_release_real,
1170         .drive_status           = ide_cdrom_drive_status,
1171         .media_changed          = ide_cdrom_check_media_change_real,
1172         .tray_move              = ide_cdrom_tray_move,
1173         .lock_door              = ide_cdrom_lock_door,
1174         .select_speed           = ide_cdrom_select_speed,
1175         .get_last_session       = ide_cdrom_get_last_session,
1176         .get_mcn                = ide_cdrom_get_mcn,
1177         .reset                  = ide_cdrom_reset,
1178         .audio_ioctl            = ide_cdrom_audio_ioctl,
1179         .capability             = IDE_CD_CAPABILITIES,
1180         .generic_packet         = ide_cdrom_packet,
1181 };
1182
1183 static int ide_cdrom_register(ide_drive_t *drive, int nslots)
1184 {
1185         struct cdrom_info *info = drive->driver_data;
1186         struct cdrom_device_info *devinfo = &info->devinfo;
1187
1188         ide_debug_log(IDE_DBG_PROBE, "nslots: %d", nslots);
1189
1190         devinfo->ops = &ide_cdrom_dops;
1191         devinfo->speed = info->current_speed;
1192         devinfo->capacity = nslots;
1193         devinfo->handle = drive;
1194         strcpy(devinfo->name, drive->name);
1195
1196         if (drive->atapi_flags & IDE_AFLAG_NO_SPEED_SELECT)
1197                 devinfo->mask |= CDC_SELECT_SPEED;
1198
1199         devinfo->disk = info->disk;
1200         return register_cdrom(devinfo);
1201 }
1202
1203 static int ide_cdrom_probe_capabilities(ide_drive_t *drive)
1204 {
1205         struct cdrom_info *cd = drive->driver_data;
1206         struct cdrom_device_info *cdi = &cd->devinfo;
1207         u8 buf[ATAPI_CAPABILITIES_PAGE_SIZE];
1208         mechtype_t mechtype;
1209         int nslots = 1;
1210
1211         ide_debug_log(IDE_DBG_PROBE, "media: 0x%x, atapi_flags: 0x%lx",
1212                                      drive->media, drive->atapi_flags);
1213
1214         cdi->mask = (CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R |
1215                      CDC_DVD_RAM | CDC_SELECT_DISC | CDC_PLAY_AUDIO |
1216                      CDC_MO_DRIVE | CDC_RAM);
1217
1218         if (drive->media == ide_optical) {
1219                 cdi->mask &= ~(CDC_MO_DRIVE | CDC_RAM);
1220                 printk(KERN_ERR PFX "%s: ATAPI magneto-optical drive\n",
1221                                 drive->name);
1222                 return nslots;
1223         }
1224
1225         if (drive->atapi_flags & IDE_AFLAG_PRE_ATAPI12) {
1226                 drive->atapi_flags &= ~IDE_AFLAG_NO_EJECT;
1227                 cdi->mask &= ~CDC_PLAY_AUDIO;
1228                 return nslots;
1229         }
1230
1231         /*
1232          * We have to cheat a little here. the packet will eventually be queued
1233          * with ide_cdrom_packet(), which extracts the drive from cdi->handle.
1234          * Since this device hasn't been registered with the Uniform layer yet,
1235          * it can't do this. Same goes for cdi->ops.
1236          */
1237         cdi->handle = drive;
1238         cdi->ops = &ide_cdrom_dops;
1239
1240         if (ide_cdrom_get_capabilities(drive, buf))
1241                 return 0;
1242
1243         if ((buf[8 + 6] & 0x01) == 0)
1244                 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
1245         if (buf[8 + 6] & 0x08)
1246                 drive->atapi_flags &= ~IDE_AFLAG_NO_EJECT;
1247         if (buf[8 + 3] & 0x01)
1248                 cdi->mask &= ~CDC_CD_R;
1249         if (buf[8 + 3] & 0x02)
1250                 cdi->mask &= ~(CDC_CD_RW | CDC_RAM);
1251         if (buf[8 + 2] & 0x38)
1252                 cdi->mask &= ~CDC_DVD;
1253         if (buf[8 + 3] & 0x20)
1254                 cdi->mask &= ~(CDC_DVD_RAM | CDC_RAM);
1255         if (buf[8 + 3] & 0x10)
1256                 cdi->mask &= ~CDC_DVD_R;
1257         if ((buf[8 + 4] & 0x01) || (drive->atapi_flags & IDE_AFLAG_PLAY_AUDIO_OK))
1258                 cdi->mask &= ~CDC_PLAY_AUDIO;
1259
1260         mechtype = buf[8 + 6] >> 5;
1261         if (mechtype == mechtype_caddy ||
1262             mechtype == mechtype_popup ||
1263             (drive->atapi_flags & IDE_AFLAG_NO_AUTOCLOSE))
1264                 cdi->mask |= CDC_CLOSE_TRAY;
1265
1266         if (cdi->sanyo_slot > 0) {
1267                 cdi->mask &= ~CDC_SELECT_DISC;
1268                 nslots = 3;
1269         } else if (mechtype == mechtype_individual_changer ||
1270                    mechtype == mechtype_cartridge_changer) {
1271                 nslots = cdrom_number_of_slots(cdi);
1272                 if (nslots > 1)
1273                         cdi->mask &= ~CDC_SELECT_DISC;
1274         }
1275
1276         ide_cdrom_update_speed(drive, buf);
1277
1278         printk(KERN_INFO PFX "%s: ATAPI", drive->name);
1279
1280         /* don't print speed if the drive reported 0 */
1281         if (cd->max_speed)
1282                 printk(KERN_CONT " %dX", cd->max_speed);
1283
1284         printk(KERN_CONT " %s", (cdi->mask & CDC_DVD) ? "CD-ROM" : "DVD-ROM");
1285
1286         if ((cdi->mask & CDC_DVD_R) == 0 || (cdi->mask & CDC_DVD_RAM) == 0)
1287                 printk(KERN_CONT " DVD%s%s",
1288                                  (cdi->mask & CDC_DVD_R) ? "" : "-R",
1289                                  (cdi->mask & CDC_DVD_RAM) ? "" : "/RAM");
1290
1291         if ((cdi->mask & CDC_CD_R) == 0 || (cdi->mask & CDC_CD_RW) == 0)
1292                 printk(KERN_CONT " CD%s%s",
1293                                  (cdi->mask & CDC_CD_R) ? "" : "-R",
1294                                  (cdi->mask & CDC_CD_RW) ? "" : "/RW");
1295
1296         if ((cdi->mask & CDC_SELECT_DISC) == 0)
1297                 printk(KERN_CONT " changer w/%d slots", nslots);
1298         else
1299                 printk(KERN_CONT " drive");
1300
1301         printk(KERN_CONT ", %dkB Cache\n",
1302                          be16_to_cpup((__be16 *)&buf[8 + 12]));
1303
1304         return nslots;
1305 }
1306
1307 /* standard prep_rq_fn that builds 10 byte cmds */
1308 static int ide_cdrom_prep_fs(struct request_queue *q, struct request *rq)
1309 {
1310         int hard_sect = queue_logical_block_size(q);
1311         long block = (long)blk_rq_pos(rq) / (hard_sect >> 9);
1312         unsigned long blocks = blk_rq_sectors(rq) / (hard_sect >> 9);
1313
1314         memset(rq->cmd, 0, BLK_MAX_CDB);
1315
1316         if (rq_data_dir(rq) == READ)
1317                 rq->cmd[0] = GPCMD_READ_10;
1318         else
1319                 rq->cmd[0] = GPCMD_WRITE_10;
1320
1321         /*
1322          * fill in lba
1323          */
1324         rq->cmd[2] = (block >> 24) & 0xff;
1325         rq->cmd[3] = (block >> 16) & 0xff;
1326         rq->cmd[4] = (block >>  8) & 0xff;
1327         rq->cmd[5] = block & 0xff;
1328
1329         /*
1330          * and transfer length
1331          */
1332         rq->cmd[7] = (blocks >> 8) & 0xff;
1333         rq->cmd[8] = blocks & 0xff;
1334         rq->cmd_len = 10;
1335         return BLKPREP_OK;
1336 }
1337
1338 /*
1339  * Most of the SCSI commands are supported directly by ATAPI devices.
1340  * This transform handles the few exceptions.
1341  */
1342 static int ide_cdrom_prep_pc(struct request *rq)
1343 {
1344         u8 *c = rq->cmd;
1345
1346         /* transform 6-byte read/write commands to the 10-byte version */
1347         if (c[0] == READ_6 || c[0] == WRITE_6) {
1348                 c[8] = c[4];
1349                 c[5] = c[3];
1350                 c[4] = c[2];
1351                 c[3] = c[1] & 0x1f;
1352                 c[2] = 0;
1353                 c[1] &= 0xe0;
1354                 c[0] += (READ_10 - READ_6);
1355                 rq->cmd_len = 10;
1356                 return BLKPREP_OK;
1357         }
1358
1359         /*
1360          * it's silly to pretend we understand 6-byte sense commands, just
1361          * reject with ILLEGAL_REQUEST and the caller should take the
1362          * appropriate action
1363          */
1364         if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
1365                 rq->errors = ILLEGAL_REQUEST;
1366                 return BLKPREP_KILL;
1367         }
1368
1369         return BLKPREP_OK;
1370 }
1371
1372 static int ide_cdrom_prep_fn(struct request_queue *q, struct request *rq)
1373 {
1374         if (rq->cmd_type == REQ_TYPE_FS)
1375                 return ide_cdrom_prep_fs(q, rq);
1376         else if (rq->cmd_type == REQ_TYPE_BLOCK_PC)
1377                 return ide_cdrom_prep_pc(rq);
1378
1379         return 0;
1380 }
1381
1382 struct cd_list_entry {
1383         const char      *id_model;
1384         const char      *id_firmware;
1385         unsigned int    cd_flags;
1386 };
1387
1388 #ifdef CONFIG_IDE_PROC_FS
1389 static sector_t ide_cdrom_capacity(ide_drive_t *drive)
1390 {
1391         unsigned long capacity, sectors_per_frame;
1392
1393         if (cdrom_read_capacity(drive, &capacity, &sectors_per_frame, NULL))
1394                 return 0;
1395
1396         return capacity * sectors_per_frame;
1397 }
1398
1399 static int idecd_capacity_proc_show(struct seq_file *m, void *v)
1400 {
1401         ide_drive_t *drive = m->private;
1402
1403         seq_printf(m, "%llu\n", (long long)ide_cdrom_capacity(drive));
1404         return 0;
1405 }
1406
1407 static int idecd_capacity_proc_open(struct inode *inode, struct file *file)
1408 {
1409         return single_open(file, idecd_capacity_proc_show, PDE(inode)->data);
1410 }
1411
1412 static const struct file_operations idecd_capacity_proc_fops = {
1413         .owner          = THIS_MODULE,
1414         .open           = idecd_capacity_proc_open,
1415         .read           = seq_read,
1416         .llseek         = seq_lseek,
1417         .release        = single_release,
1418 };
1419
1420 static ide_proc_entry_t idecd_proc[] = {
1421         { "capacity", S_IFREG|S_IRUGO, &idecd_capacity_proc_fops },
1422         {}
1423 };
1424
1425 static ide_proc_entry_t *ide_cd_proc_entries(ide_drive_t *drive)
1426 {
1427         return idecd_proc;
1428 }
1429
1430 static const struct ide_proc_devset *ide_cd_proc_devsets(ide_drive_t *drive)
1431 {
1432         return NULL;
1433 }
1434 #endif
1435
1436 static const struct cd_list_entry ide_cd_quirks_list[] = {
1437         /* SCR-3231 doesn't support the SET_CD_SPEED command. */
1438         { "SAMSUNG CD-ROM SCR-3231", NULL,   IDE_AFLAG_NO_SPEED_SELECT       },
1439         /* Old NEC260 (not R) was released before ATAPI 1.2 spec. */
1440         { "NEC CD-ROM DRIVE:260",    "1.01", IDE_AFLAG_TOCADDR_AS_BCD |
1441                                              IDE_AFLAG_PRE_ATAPI12,          },
1442         /* Vertos 300, some versions of this drive like to talk BCD. */
1443         { "V003S0DS",                NULL,   IDE_AFLAG_VERTOS_300_SSD,       },
1444         /* Vertos 600 ESD. */
1445         { "V006E0DS",                NULL,   IDE_AFLAG_VERTOS_600_ESD,       },
1446         /*
1447          * Sanyo 3 CD changer uses a non-standard command for CD changing
1448          * (by default standard ATAPI support for CD changers is used).
1449          */
1450         { "CD-ROM CDR-C3 G",         NULL,   IDE_AFLAG_SANYO_3CD             },
1451         { "CD-ROM CDR-C3G",          NULL,   IDE_AFLAG_SANYO_3CD             },
1452         { "CD-ROM CDR_C36",          NULL,   IDE_AFLAG_SANYO_3CD             },
1453         /* Stingray 8X CD-ROM. */
1454         { "STINGRAY 8422 IDE 8X CD-ROM 7-27-95", NULL, IDE_AFLAG_PRE_ATAPI12 },
1455         /*
1456          * ACER 50X CD-ROM and WPI 32X CD-ROM require the full spec length
1457          * mode sense page capabilities size, but older drives break.
1458          */
1459         { "ATAPI CD ROM DRIVE 50X MAX", NULL,   IDE_AFLAG_FULL_CAPS_PAGE     },
1460         { "WPI CDS-32X",                NULL,   IDE_AFLAG_FULL_CAPS_PAGE     },
1461         /* ACER/AOpen 24X CD-ROM has the speed fields byte-swapped. */
1462         { "",                        "241N", IDE_AFLAG_LE_SPEED_FIELDS       },
1463         /*
1464          * Some drives used by Apple don't advertise audio play
1465          * but they do support reading TOC & audio datas.
1466          */
1467         { "MATSHITADVD-ROM SR-8187", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1468         { "MATSHITADVD-ROM SR-8186", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1469         { "MATSHITADVD-ROM SR-8176", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1470         { "MATSHITADVD-ROM SR-8174", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1471         { "Optiarc DVD RW AD-5200A", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1472         { "Optiarc DVD RW AD-7200A", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1473         { "Optiarc DVD RW AD-7543A", NULL,   IDE_AFLAG_NO_AUTOCLOSE          },
1474         { "TEAC CD-ROM CD-224E",     NULL,   IDE_AFLAG_NO_AUTOCLOSE          },
1475         { NULL, NULL, 0 }
1476 };
1477
1478 static unsigned int ide_cd_flags(u16 *id)
1479 {
1480         const struct cd_list_entry *cle = ide_cd_quirks_list;
1481
1482         while (cle->id_model) {
1483                 if (strcmp(cle->id_model, (char *)&id[ATA_ID_PROD]) == 0 &&
1484                     (cle->id_firmware == NULL ||
1485                      strstr((char *)&id[ATA_ID_FW_REV], cle->id_firmware)))
1486                         return cle->cd_flags;
1487                 cle++;
1488         }
1489
1490         return 0;
1491 }
1492
1493 static int ide_cdrom_setup(ide_drive_t *drive)
1494 {
1495         struct cdrom_info *cd = drive->driver_data;
1496         struct cdrom_device_info *cdi = &cd->devinfo;
1497         struct request_queue *q = drive->queue;
1498         u16 *id = drive->id;
1499         char *fw_rev = (char *)&id[ATA_ID_FW_REV];
1500         int nslots;
1501
1502         ide_debug_log(IDE_DBG_PROBE, "enter");
1503
1504         blk_queue_prep_rq(q, ide_cdrom_prep_fn);
1505         blk_queue_dma_alignment(q, 31);
1506         blk_queue_update_dma_pad(q, 15);
1507
1508         q->unplug_delay = max((1 * HZ) / 1000, 1);
1509
1510         drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;
1511         drive->atapi_flags = IDE_AFLAG_NO_EJECT | ide_cd_flags(id);
1512
1513         if ((drive->atapi_flags & IDE_AFLAG_VERTOS_300_SSD) &&
1514             fw_rev[4] == '1' && fw_rev[6] <= '2')
1515                 drive->atapi_flags |= (IDE_AFLAG_TOCTRACKS_AS_BCD |
1516                                      IDE_AFLAG_TOCADDR_AS_BCD);
1517         else if ((drive->atapi_flags & IDE_AFLAG_VERTOS_600_ESD) &&
1518                  fw_rev[4] == '1' && fw_rev[6] <= '2')
1519                 drive->atapi_flags |= IDE_AFLAG_TOCTRACKS_AS_BCD;
1520         else if (drive->atapi_flags & IDE_AFLAG_SANYO_3CD)
1521                 /* 3 => use CD in slot 0 */
1522                 cdi->sanyo_slot = 3;
1523
1524         nslots = ide_cdrom_probe_capabilities(drive);
1525
1526         blk_queue_logical_block_size(q, CD_FRAMESIZE);
1527
1528         if (ide_cdrom_register(drive, nslots)) {
1529                 printk(KERN_ERR PFX "%s: %s failed to register device with the"
1530                                 " cdrom driver.\n", drive->name, __func__);
1531                 cd->devinfo.handle = NULL;
1532                 return 1;
1533         }
1534
1535         ide_proc_register_driver(drive, cd->driver);
1536         return 0;
1537 }
1538
1539 static void ide_cd_remove(ide_drive_t *drive)
1540 {
1541         struct cdrom_info *info = drive->driver_data;
1542
1543         ide_debug_log(IDE_DBG_FUNC, "enter");
1544
1545         ide_proc_unregister_driver(drive, info->driver);
1546         device_del(&info->dev);
1547         del_gendisk(info->disk);
1548
1549         mutex_lock(&idecd_ref_mutex);
1550         put_device(&info->dev);
1551         mutex_unlock(&idecd_ref_mutex);
1552 }
1553
1554 static void ide_cd_release(struct device *dev)
1555 {
1556         struct cdrom_info *info = to_ide_drv(dev, cdrom_info);
1557         struct cdrom_device_info *devinfo = &info->devinfo;
1558         ide_drive_t *drive = info->drive;
1559         struct gendisk *g = info->disk;
1560
1561         ide_debug_log(IDE_DBG_FUNC, "enter");
1562
1563         kfree(info->toc);
1564         if (devinfo->handle == drive)
1565                 unregister_cdrom(devinfo);
1566         drive->driver_data = NULL;
1567         blk_queue_prep_rq(drive->queue, NULL);
1568         g->private_data = NULL;
1569         put_disk(g);
1570         kfree(info);
1571 }
1572
1573 static int ide_cd_probe(ide_drive_t *);
1574
1575 static struct ide_driver ide_cdrom_driver = {
1576         .gen_driver = {
1577                 .owner          = THIS_MODULE,
1578                 .name           = "ide-cdrom",
1579                 .bus            = &ide_bus_type,
1580         },
1581         .probe                  = ide_cd_probe,
1582         .remove                 = ide_cd_remove,
1583         .version                = IDECD_VERSION,
1584         .do_request             = ide_cd_do_request,
1585 #ifdef CONFIG_IDE_PROC_FS
1586         .proc_entries           = ide_cd_proc_entries,
1587         .proc_devsets           = ide_cd_proc_devsets,
1588 #endif
1589 };
1590
1591 static int idecd_open(struct block_device *bdev, fmode_t mode)
1592 {
1593         struct cdrom_info *info = ide_cd_get(bdev->bd_disk);
1594         int rc = -ENOMEM;
1595
1596         if (!info)
1597                 return -ENXIO;
1598
1599         rc = cdrom_open(&info->devinfo, bdev, mode);
1600
1601         if (rc < 0)
1602                 ide_cd_put(info);
1603
1604         return rc;
1605 }
1606
1607 static int idecd_release(struct gendisk *disk, fmode_t mode)
1608 {
1609         struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
1610
1611         cdrom_release(&info->devinfo, mode);
1612
1613         ide_cd_put(info);
1614
1615         return 0;
1616 }
1617
1618 static int idecd_set_spindown(struct cdrom_device_info *cdi, unsigned long arg)
1619 {
1620         struct packet_command cgc;
1621         char buffer[16];
1622         int stat;
1623         char spindown;
1624
1625         if (copy_from_user(&spindown, (void __user *)arg, sizeof(char)))
1626                 return -EFAULT;
1627
1628         init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_UNKNOWN);
1629
1630         stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CDROM_PAGE, 0);
1631         if (stat)
1632                 return stat;
1633
1634         buffer[11] = (buffer[11] & 0xf0) | (spindown & 0x0f);
1635         return cdrom_mode_select(cdi, &cgc);
1636 }
1637
1638 static int idecd_get_spindown(struct cdrom_device_info *cdi, unsigned long arg)
1639 {
1640         struct packet_command cgc;
1641         char buffer[16];
1642         int stat;
1643         char spindown;
1644
1645         init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_UNKNOWN);
1646
1647         stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CDROM_PAGE, 0);
1648         if (stat)
1649                 return stat;
1650
1651         spindown = buffer[11] & 0x0f;
1652         if (copy_to_user((void __user *)arg, &spindown, sizeof(char)))
1653                 return -EFAULT;
1654         return 0;
1655 }
1656
1657 static int idecd_ioctl(struct block_device *bdev, fmode_t mode,
1658                         unsigned int cmd, unsigned long arg)
1659 {
1660         struct cdrom_info *info = ide_drv_g(bdev->bd_disk, cdrom_info);
1661         int err;
1662
1663         switch (cmd) {
1664         case CDROMSETSPINDOWN:
1665                 return idecd_set_spindown(&info->devinfo, arg);
1666         case CDROMGETSPINDOWN:
1667                 return idecd_get_spindown(&info->devinfo, arg);
1668         default:
1669                 break;
1670         }
1671
1672         err = generic_ide_ioctl(info->drive, bdev, cmd, arg);
1673         if (err == -EINVAL)
1674                 err = cdrom_ioctl(&info->devinfo, bdev, mode, cmd, arg);
1675
1676         return err;
1677 }
1678
1679 static int idecd_media_changed(struct gendisk *disk)
1680 {
1681         struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
1682         return cdrom_media_changed(&info->devinfo);
1683 }
1684
1685 static int idecd_revalidate_disk(struct gendisk *disk)
1686 {
1687         struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
1688         struct request_sense sense;
1689
1690         ide_cd_read_toc(info->drive, &sense);
1691
1692         return  0;
1693 }
1694
1695 static const struct block_device_operations idecd_ops = {
1696         .owner                  = THIS_MODULE,
1697         .open                   = idecd_open,
1698         .release                = idecd_release,
1699         .locked_ioctl           = idecd_ioctl,
1700         .media_changed          = idecd_media_changed,
1701         .revalidate_disk        = idecd_revalidate_disk
1702 };
1703
1704 /* module options */
1705 static unsigned long debug_mask;
1706 module_param(debug_mask, ulong, 0644);
1707
1708 MODULE_DESCRIPTION("ATAPI CD-ROM Driver");
1709
1710 static int ide_cd_probe(ide_drive_t *drive)
1711 {
1712         struct cdrom_info *info;
1713         struct gendisk *g;
1714         struct request_sense sense;
1715
1716         ide_debug_log(IDE_DBG_PROBE, "driver_req: %s, media: 0x%x",
1717                                      drive->driver_req, drive->media);
1718
1719         if (!strstr("ide-cdrom", drive->driver_req))
1720                 goto failed;
1721
1722         if (drive->media != ide_cdrom && drive->media != ide_optical)
1723                 goto failed;
1724
1725         drive->debug_mask = debug_mask;
1726         drive->irq_handler = cdrom_newpc_intr;
1727
1728         info = kzalloc(sizeof(struct cdrom_info), GFP_KERNEL);
1729         if (info == NULL) {
1730                 printk(KERN_ERR PFX "%s: Can't allocate a cdrom structure\n",
1731                                 drive->name);
1732                 goto failed;
1733         }
1734
1735         g = alloc_disk(1 << PARTN_BITS);
1736         if (!g)
1737                 goto out_free_cd;
1738
1739         ide_init_disk(g, drive);
1740
1741         info->dev.parent = &drive->gendev;
1742         info->dev.release = ide_cd_release;
1743         dev_set_name(&info->dev, dev_name(&drive->gendev));
1744
1745         if (device_register(&info->dev))
1746                 goto out_free_disk;
1747
1748         info->drive = drive;
1749         info->driver = &ide_cdrom_driver;
1750         info->disk = g;
1751
1752         g->private_data = &info->driver;
1753
1754         drive->driver_data = info;
1755
1756         g->minors = 1;
1757         g->driverfs_dev = &drive->gendev;
1758         g->flags = GENHD_FL_CD | GENHD_FL_REMOVABLE;
1759         if (ide_cdrom_setup(drive)) {
1760                 put_device(&info->dev);
1761                 goto failed;
1762         }
1763
1764         ide_cd_read_toc(drive, &sense);
1765         g->fops = &idecd_ops;
1766         g->flags |= GENHD_FL_REMOVABLE;
1767         add_disk(g);
1768         return 0;
1769
1770 out_free_disk:
1771         put_disk(g);
1772 out_free_cd:
1773         kfree(info);
1774 failed:
1775         return -ENODEV;
1776 }
1777
1778 static void __exit ide_cdrom_exit(void)
1779 {
1780         driver_unregister(&ide_cdrom_driver.gen_driver);
1781 }
1782
1783 static int __init ide_cdrom_init(void)
1784 {
1785         printk(KERN_INFO DRV_NAME " driver " IDECD_VERSION "\n");
1786         return driver_register(&ide_cdrom_driver.gen_driver);
1787 }
1788
1789 MODULE_ALIAS("ide:*m-cdrom*");
1790 MODULE_ALIAS("ide-cd");
1791 module_init(ide_cdrom_init);
1792 module_exit(ide_cdrom_exit);
1793 MODULE_LICENSE("GPL");