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   1 /*
   2  * ATAPI CD-ROM driver.
   3  *
   4  * Copyright (C) 1994-1996   Scott Snyder <snyder@fnald0.fnal.gov>
   5  * Copyright (C) 1996-1998   Erik Andersen <andersee@debian.org>
   6  * Copyright (C) 1998-2000   Jens Axboe <axboe@suse.de>
   7  * Copyright (C) 2005, 2007-2009  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/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 static void ide_cd_release(struct device *);
  56
  57 static struct cdrom_info *ide_cd_get(struct gendisk *disk)
  58 {
  59         struct cdrom_info *cd = NULL;
  60
  61         mutex_lock(&idecd_ref_mutex);
  62         cd = ide_drv_g(disk, cdrom_info);
  63         if (cd) {
  64                 if (ide_device_get(cd->drive))
  65                         cd = NULL;
  66                 else
  67                         get_device(&cd->dev);
  68
  69         }
  70         mutex_unlock(&idecd_ref_mutex);
  71         return cd;
  72 }
  73
  74 static void ide_cd_put(struct cdrom_info *cd)
  75 {
  76         ide_drive_t *drive = cd->drive;
  77
  78         mutex_lock(&idecd_ref_mutex);
  79         put_device(&cd->dev);
  80         ide_device_put(drive);
  81         mutex_unlock(&idecd_ref_mutex);
  82 }
  83
  84 /*
  85  * Generic packet command support and error handling routines.
  86  */
  87
  88 /* Mark that we've seen a media change and invalidate our internal buffers. */
  89 static void cdrom_saw_media_change(ide_drive_t *drive)
  90 {
  91         drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;
  92         drive->atapi_flags &= ~IDE_AFLAG_TOC_VALID;
  93 }
  94
  95 static int cdrom_log_sense(ide_drive_t *drive, struct request *rq,
  96                            struct request_sense *sense)
  97 {
  98         int log = 0;
  99
 100         ide_debug_log(IDE_DBG_SENSE, "sense_key: 0x%x", sense->sense_key);
 101
 102         if (!sense || !rq || (rq->cmd_flags & REQ_QUIET))
 103                 return 0;
 104
 105         switch (sense->sense_key) {
 106         case NO_SENSE:
 107         case RECOVERED_ERROR:
 108                 break;
 109         case NOT_READY:
 110                 /*
 111                  * don't care about tray state messages for e.g. capacity
 112                  * commands or in-progress or becoming ready
 113                  */
 114                 if (sense->asc == 0x3a || sense->asc == 0x04)
 115                         break;
 116                 log = 1;
 117                 break;
 118         case ILLEGAL_REQUEST:
 119                 /*
 120                  * don't log START_STOP unit with LoEj set, since we cannot
 121                  * reliably check if drive can auto-close
 122                  */
 123                 if (rq->cmd[0] == GPCMD_START_STOP_UNIT && sense->asc == 0x24)
 124                         break;
 125                 log = 1;
 126                 break;
 127         case UNIT_ATTENTION:
 128                 /*
 129                  * Make good and sure we've seen this potential media change.
 130                  * Some drives (i.e. Creative) fail to present the correct sense
 131                  * key in the error register.
 132                  */
 133                 cdrom_saw_media_change(drive);
 134                 break;
 135         default:
 136                 log = 1;
 137                 break;
 138         }
 139         return log;
 140 }
 141
 142 static void cdrom_analyze_sense_data(ide_drive_t *drive,
 143                               struct request *failed_command,
 144                               struct request_sense *sense)
 145 {
 146         unsigned long sector;
 147         unsigned long bio_sectors;
 148         struct cdrom_info *info = drive->driver_data;
 149
 150         ide_debug_log(IDE_DBG_SENSE, "error_code: 0x%x, sense_key: 0x%x",
 151                                      sense->error_code, sense->sense_key);
 152
 153         if (failed_command)
 154                 ide_debug_log(IDE_DBG_SENSE, "failed cmd: 0x%x",
 155                                              failed_command->cmd[0]);
 156
 157         if (!cdrom_log_sense(drive, failed_command, sense))
 158                 return;
 159
 160         /*
 161          * If a read toc is executed for a CD-R or CD-RW medium where the first
 162          * toc has not been recorded yet, it will fail with 05/24/00 (which is a
 163          * confusing error)
 164          */
 165         if (failed_command && failed_command->cmd[0] == GPCMD_READ_TOC_PMA_ATIP)
 166                 if (sense->sense_key == 0x05 && sense->asc == 0x24)
 167                         return;
 168
 169         /* current error */
 170         if (sense->error_code == 0x70) {
 171                 switch (sense->sense_key) {
 172                 case MEDIUM_ERROR:
 173                 case VOLUME_OVERFLOW:
 174                 case ILLEGAL_REQUEST:
 175                         if (!sense->valid)
 176                                 break;
 177                         if (failed_command == NULL ||
 178                                         !blk_fs_request(failed_command))
 179                                 break;
 180                         sector = (sense->information[0] << 24) |
 181                                  (sense->information[1] << 16) |
 182                                  (sense->information[2] <<  8) |
 183                                  (sense->information[3]);
 184
 185                         if (drive->queue->hardsect_size == 2048)
 186                                 /* device sector size is 2K */
 187                                 sector <<= 2;
 188
 189                         bio_sectors = max(bio_sectors(failed_command->bio), 4U);
 190                         sector &= ~(bio_sectors - 1);
 191
 192                         /*
 193                          * The SCSI specification allows for the value
 194                          * returned by READ CAPACITY to be up to 75 2K
 195                          * sectors past the last readable block.
 196                          * Therefore, if we hit a medium error within the
 197                          * last 75 2K sectors, we decrease the saved size
 198                          * value.
 199                          */
 200                         if (sector < get_capacity(info->disk) &&
 201                             drive->probed_capacity - sector < 4 * 75)
 202                                 set_capacity(info->disk, sector);
 203                 }
 204         }
 205
 206         ide_cd_log_error(drive->name, failed_command, sense);
 207 }
 208
 209 static void ide_cd_complete_failed_rq(ide_drive_t *drive, struct request *rq)
 210 {
 211         /*
 212          * For REQ_TYPE_SENSE, "rq->special" points to the original
 213          * failed request.  Also, the sense data should be read
 214          * directly from rq which might be different from the original
 215          * sense buffer if it got copied during mapping.
 216          */
 217         struct request *failed = (struct request *)rq->special;
 218         void *sense = bio_data(rq->bio);
 219
 220         if (failed) {
 221                 if (failed->sense) {
 222                         /*
 223                          * Sense is always read into drive->sense_data.
 224                          * Copy back if the failed request has its
 225                          * sense pointer set.
 226                          */
 227                         memcpy(failed->sense, sense, 18);
 228                         sense = failed->sense;
 229                         failed->sense_len = rq->sense_len;
 230                 }
 231                 cdrom_analyze_sense_data(drive, failed, sense);
 232
 233                 if (ide_end_rq(drive, failed, -EIO, blk_rq_bytes(failed)))
 234                         BUG();
 235         } else
 236                 cdrom_analyze_sense_data(drive, NULL, sense);
 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         u8 quiet = rq->cmd_flags & REQ_QUIET;
 287
 288         /* get the IDE error register */
 289         err = ide_read_error(drive);
 290         sense_key = err >> 4;
 291
 292         ide_debug_log(IDE_DBG_RQ, "cmd: 0x%x, rq->cmd_type: 0x%x, err: 0x%x, "
 293                                   "stat 0x%x",
 294                                   rq->cmd[0], rq->cmd_type, err, stat);
 295
 296         if (blk_sense_request(rq)) {
 297                 /*
 298                  * We got an error trying to get sense info from the drive
 299                  * (probably while trying to recover from a former error).
 300                  * Just give up.
 301                  */
 302                 rq->cmd_flags |= REQ_FAILED;
 303                 return 2;
 304         }
 305
 306         /* if we have an error, pass CHECK_CONDITION as the SCSI status byte */
 307         if (blk_pc_request(rq) && !rq->errors)
 308                 rq->errors = SAM_STAT_CHECK_CONDITION;
 309
 310         if (blk_noretry_request(rq))
 311                 do_end_request = 1;
 312
 313         switch (sense_key) {
 314         case NOT_READY:
 315                 if (blk_fs_request(rq) && rq_data_dir(rq) == WRITE) {
 316                         if (ide_cd_breathe(drive, rq))
 317                                 return 1;
 318                 } else {
 319                         cdrom_saw_media_change(drive);
 320
 321                         if (blk_fs_request(rq) && !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 (blk_fs_request(rq) == 0)
 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 (!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 (!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 (!quiet)
 373                         ide_dump_status(drive, "media error (blank)",
 374                                         stat);
 375                 do_end_request = 1;
 376                 break;
 377         default:
 378                 if (blk_fs_request(rq) == 0)
 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 (blk_fs_request(rq) == 0) {
 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 /*
 415  * Check the contents of the interrupt reason register from the cdrom
 416  * and attempt to recover if there are problems.  Returns  0 if everything's
 417  * ok; nonzero if the request has been terminated.
 418  */
 419 static int ide_cd_check_ireason(ide_drive_t *drive, struct request *rq,
 420                                 int len, int ireason, int rw)
 421 {
 422         ide_hwif_t *hwif = drive->hwif;
 423
 424         ide_debug_log(IDE_DBG_FUNC, "ireason: 0x%x, rw: 0x%x", ireason, rw);
 425
 426         /*
 427          * ireason == 0: the drive wants to receive data from us
 428          * ireason == 2: the drive is expecting to transfer data to us
 429          */
 430         if (ireason == (!rw << 1))
 431                 return 0;
 432         else if (ireason == (rw << 1)) {
 433
 434                 /* whoops... */
 435                 printk(KERN_ERR PFX "%s: %s: wrong transfer direction!\n",
 436                                 drive->name, __func__);
 437
 438                 ide_pad_transfer(drive, rw, len);
 439         } else  if (rw == 0 && ireason == 1) {
 440                 /*
 441                  * Some drives (ASUS) seem to tell us that status info is
 442                  * available.  Just get it and ignore.
 443                  */
 444                 (void)hwif->tp_ops->read_status(hwif);
 445                 return 0;
 446         } else {
 447                 /* drive wants a command packet, or invalid ireason... */
 448                 printk(KERN_ERR PFX "%s: %s: bad interrupt reason 0x%02x\n",
 449                                 drive->name, __func__, ireason);
 450         }
 451
 452         if (rq->cmd_type == REQ_TYPE_ATA_PC)
 453                 rq->cmd_flags |= REQ_FAILED;
 454
 455         return -1;
 456 }
 457
 458 static void ide_cd_request_sense_fixup(ide_drive_t *drive, struct ide_cmd *cmd)
 459 {
 460         struct request *rq = cmd->rq;
 461
 462         ide_debug_log(IDE_DBG_FUNC, "rq->cmd[0]: 0x%x", rq->cmd[0]);
 463
 464         /*
 465          * Some of the trailing request sense fields are optional,
 466          * and some drives don't send them.  Sigh.
 467          */
 468         if (rq->cmd[0] == GPCMD_REQUEST_SENSE &&
 469             cmd->nleft > 0 && cmd->nleft <= 5)
 470                 cmd->nleft = 0;
 471 }
 472
 473 int ide_cd_queue_pc(ide_drive_t *drive, const unsigned char *cmd,
 474                     int write, void *buffer, unsigned *bufflen,
 475                     struct request_sense *sense, int timeout,
 476                     unsigned int cmd_flags)
 477 {
 478         struct cdrom_info *info = drive->driver_data;
 479         struct request_sense local_sense;
 480         int retries = 10;
 481         unsigned int flags = 0;
 482
 483         if (!sense)
 484                 sense = &local_sense;
 485
 486         ide_debug_log(IDE_DBG_PC, "cmd[0]: 0x%x, write: 0x%x, timeout: %d, "
 487                                   "cmd_flags: 0x%x",
 488                                   cmd[0], write, timeout, cmd_flags);
 489
 490         /* start of retry loop */
 491         do {
 492                 struct request *rq;
 493                 int error;
 494
 495                 rq = blk_get_request(drive->queue, write, __GFP_WAIT);
 496
 497                 memcpy(rq->cmd, cmd, BLK_MAX_CDB);
 498                 rq->cmd_type = REQ_TYPE_ATA_PC;
 499                 rq->sense = sense;
 500                 rq->cmd_flags |= cmd_flags;
 501                 rq->timeout = timeout;
 502                 if (buffer) {
 503                         error = blk_rq_map_kern(drive->queue, rq, buffer,
 504                                                 *bufflen, GFP_NOIO);
 505                         if (error) {
 506                                 blk_put_request(rq);
 507                                 return error;
 508                         }
 509                 }
 510
 511                 error = blk_execute_rq(drive->queue, info->disk, rq, 0);
 512
 513                 if (buffer)
 514                         *bufflen = rq->resid_len;
 515
 516                 flags = rq->cmd_flags;
 517                 blk_put_request(rq);
 518
 519                 /*
 520                  * FIXME: we should probably abort/retry or something in case of
 521                  * failure.
 522                  */
 523                 if (flags & REQ_FAILED) {
 524                         /*
 525                          * The request failed.  Retry if it was due to a unit
 526                          * attention status (usually means media was changed).
 527                          */
 528                         struct request_sense *reqbuf = sense;
 529
 530                         if (reqbuf->sense_key == UNIT_ATTENTION)
 531                                 cdrom_saw_media_change(drive);
 532                         else if (reqbuf->sense_key == NOT_READY &&
 533                                  reqbuf->asc == 4 && reqbuf->ascq != 4) {
 534                                 /*
 535                                  * The drive is in the process of loading
 536                                  * a disk.  Retry, but wait a little to give
 537                                  * the drive time to complete the load.
 538                                  */
 539                                 ssleep(2);
 540                         } else {
 541                                 /* otherwise, don't retry */
 542                                 retries = 0;
 543                         }
 544                         --retries;
 545                 }
 546
 547                 /* end of retry loop */
 548         } while ((flags & REQ_FAILED) && retries >= 0);
 549
 550         /* return an error if the command failed */
 551         return (flags & REQ_FAILED) ? -EIO : 0;
 552 }
 553
 554 static void ide_cd_error_cmd(ide_drive_t *drive, struct ide_cmd *cmd)
 555 {
 556         unsigned int nr_bytes = cmd->nbytes - cmd->nleft;
 557
 558         if (cmd->tf_flags & IDE_TFLAG_WRITE)
 559                 nr_bytes -= cmd->last_xfer_len;
 560
 561         if (nr_bytes > 0)
 562                 ide_complete_rq(drive, 0, nr_bytes);
 563 }
 564
 565 static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
 566 {
 567         ide_hwif_t *hwif = drive->hwif;
 568         struct ide_cmd *cmd = &hwif->cmd;
 569         struct request *rq = hwif->rq;
 570         ide_expiry_t *expiry = NULL;
 571         int dma_error = 0, dma, thislen, uptodate = 0;
 572         int write = (rq_data_dir(rq) == WRITE) ? 1 : 0, rc = 0;
 573         int sense = blk_sense_request(rq);
 574         unsigned int timeout;
 575         u16 len;
 576         u8 ireason, stat;
 577
 578         ide_debug_log(IDE_DBG_PC, "cmd: 0x%x, write: 0x%x", rq->cmd[0], write);
 579
 580         /* check for errors */
 581         dma = drive->dma;
 582         if (dma) {
 583                 drive->dma = 0;
 584                 drive->waiting_for_dma = 0;
 585                 dma_error = hwif->dma_ops->dma_end(drive);
 586                 ide_dma_unmap_sg(drive, cmd);
 587                 if (dma_error) {
 588                         printk(KERN_ERR PFX "%s: DMA %s error\n", drive->name,
 589                                         write ? "write" : "read");
 590                         ide_dma_off(drive);
 591                 }
 592         }
 593
 594         /* check status */
 595         stat = hwif->tp_ops->read_status(hwif);
 596
 597         if (!OK_STAT(stat, 0, BAD_R_STAT)) {
 598                 rc = cdrom_decode_status(drive, stat);
 599                 if (rc) {
 600                         if (rc == 2)
 601                                 goto out_end;
 602                         return ide_stopped;
 603                 }
 604         }
 605
 606         /* using dma, transfer is complete now */
 607         if (dma) {
 608                 if (dma_error)
 609                         return ide_error(drive, "dma error", stat);
 610                 uptodate = 1;
 611                 goto out_end;
 612         }
 613
 614         ide_read_bcount_and_ireason(drive, &len, &ireason);
 615
 616         thislen = blk_fs_request(rq) ? len : cmd->nleft;
 617         if (thislen > len)
 618                 thislen = len;
 619
 620         ide_debug_log(IDE_DBG_PC, "DRQ: stat: 0x%x, thislen: %d",
 621                                   stat, thislen);
 622
 623         /* If DRQ is clear, the command has completed. */
 624         if ((stat & ATA_DRQ) == 0) {
 625                 if (blk_fs_request(rq)) {
 626                         /*
 627                          * If we're not done reading/writing, complain.
 628                          * Otherwise, complete the command normally.
 629                          */
 630                         uptodate = 1;
 631                         if (cmd->nleft > 0) {
 632                                 printk(KERN_ERR PFX "%s: %s: data underrun "
 633                                         "(%u bytes)\n", drive->name, __func__,
 634                                         cmd->nleft);
 635                                 if (!write)
 636                                         rq->cmd_flags |= REQ_FAILED;
 637                                 uptodate = 0;
 638                         }
 639                 } else if (!blk_pc_request(rq)) {
 640                         ide_cd_request_sense_fixup(drive, cmd);
 641                         /* complain if we still have data left to transfer */
 642                         uptodate = cmd->nleft ? 0 : 1;
 643                         if (uptodate == 0)
 644                                 rq->cmd_flags |= REQ_FAILED;
 645                 }
 646                 goto out_end;
 647         }
 648
 649         /* check which way to transfer data */
 650         rc = ide_cd_check_ireason(drive, rq, len, ireason, write);
 651         if (rc)
 652                 goto out_end;
 653
 654         cmd->last_xfer_len = 0;
 655
 656         ide_debug_log(IDE_DBG_PC, "data transfer, rq->cmd_type: 0x%x, "
 657                                   "ireason: 0x%x",
 658                                   rq->cmd_type, ireason);
 659
 660         /* transfer data */
 661         while (thislen > 0) {
 662                 int blen = min_t(int, thislen, cmd->nleft);
 663
 664                 if (cmd->nleft == 0)
 665                         break;
 666
 667                 ide_pio_bytes(drive, cmd, write, blen);
 668                 cmd->last_xfer_len += blen;
 669
 670                 thislen -= blen;
 671                 len -= blen;
 672
 673                 if (sense && write == 0)
 674                         rq->sense_len += blen;
 675         }
 676
 677         /* pad, if necessary */
 678         if (len > 0) {
 679                 if (blk_fs_request(rq) == 0 || write == 0)
 680                         ide_pad_transfer(drive, write, len);
 681                 else {
 682                         printk(KERN_ERR PFX "%s: confused, missing data\n",
 683                                 drive->name);
 684                         blk_dump_rq_flags(rq, "cdrom_newpc_intr");
 685                 }
 686         }
 687
 688         if (blk_pc_request(rq)) {
 689                 timeout = rq->timeout;
 690         } else {
 691                 timeout = ATAPI_WAIT_PC;
 692                 if (!blk_fs_request(rq))
 693                         expiry = ide_cd_expiry;
 694         }
 695
 696         hwif->expiry = expiry;
 697         ide_set_handler(drive, cdrom_newpc_intr, timeout);
 698         return ide_started;
 699
 700 out_end:
 701         if (blk_pc_request(rq) && rc == 0) {
 702                 blk_end_request_all(rq, 0);
 703                 hwif->rq = NULL;
 704         } else {
 705                 if (sense && uptodate)
 706                         ide_cd_complete_failed_rq(drive, rq);
 707
 708                 if (blk_fs_request(rq)) {
 709                         if (cmd->nleft == 0)
 710                                 uptodate = 1;
 711                 } else {
 712                         if (uptodate <= 0 && rq->errors == 0)
 713                                 rq->errors = -EIO;
 714                 }
 715
 716                 if (uptodate == 0)
 717                         ide_cd_error_cmd(drive, cmd);
 718
 719                 /* make sure it's fully ended */
 720                 if (blk_fs_request(rq) == 0) {
 721                         rq->resid_len = blk_rq_bytes(rq) -
 722                                 (cmd->nbytes - cmd->nleft);
 723                         if (uptodate == 0 && (cmd->tf_flags & IDE_TFLAG_WRITE))
 724                                 rq->resid_len += cmd->last_xfer_len;
 725                 }
 726
 727                 ide_complete_rq(drive, uptodate ? 0 : -EIO, blk_rq_bytes(rq));
 728
 729                 if (sense && rc == 2)
 730                         ide_error(drive, "request sense failure", stat);
 731         }
 732         return ide_stopped;
 733 }
 734
 735 static ide_startstop_t cdrom_start_rw(ide_drive_t *drive, struct request *rq)
 736 {
 737         struct cdrom_info *cd = drive->driver_data;
 738         struct request_queue *q = drive->queue;
 739         int write = rq_data_dir(rq) == WRITE;
 740         unsigned short sectors_per_frame =
 741                 queue_hardsect_size(q) >> SECTOR_BITS;
 742
 743         ide_debug_log(IDE_DBG_RQ, "rq->cmd[0]: 0x%x, rq->cmd_flags: 0x%x, "
 744                                   "secs_per_frame: %u",
 745                                   rq->cmd[0], rq->cmd_flags, sectors_per_frame);
 746
 747         if (write) {
 748                 /* disk has become write protected */
 749                 if (get_disk_ro(cd->disk))
 750                         return ide_stopped;
 751         } else {
 752                 /*
 753                  * We may be retrying this request after an error.  Fix up any
 754                  * weirdness which might be present in the request packet.
 755                  */
 756                 q->prep_rq_fn(q, rq);
 757         }
 758
 759         /* fs requests *must* be hardware frame aligned */
 760         if ((blk_rq_sectors(rq) & (sectors_per_frame - 1)) ||
 761             (blk_rq_pos(rq) & (sectors_per_frame - 1)))
 762                 return ide_stopped;
 763
 764         /* use DMA, if possible */
 765         drive->dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
 766
 767         if (write)
 768                 cd->devinfo.media_written = 1;
 769
 770         rq->timeout = ATAPI_WAIT_PC;
 771
 772         return ide_started;
 773 }
 774
 775 static void cdrom_do_block_pc(ide_drive_t *drive, struct request *rq)
 776 {
 777
 778         ide_debug_log(IDE_DBG_PC, "rq->cmd[0]: 0x%x, rq->cmd_type: 0x%x",
 779                                   rq->cmd[0], rq->cmd_type);
 780
 781         if (blk_pc_request(rq))
 782                 rq->cmd_flags |= REQ_QUIET;
 783         else
 784                 rq->cmd_flags &= ~REQ_FAILED;
 785
 786         drive->dma = 0;
 787
 788         /* sg request */
 789         if (rq->bio) {
 790                 struct request_queue *q = drive->queue;
 791                 char *buf = bio_data(rq->bio);
 792                 unsigned int alignment;
 793
 794                 drive->dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
 795
 796                 /*
 797                  * check if dma is safe
 798                  *
 799                  * NOTE! The "len" and "addr" checks should possibly have
 800                  * separate masks.
 801                  */
 802                 alignment = queue_dma_alignment(q) | q->dma_pad_mask;
 803                 if ((unsigned long)buf & alignment
 804                     || blk_rq_bytes(rq) & q->dma_pad_mask
 805                     || object_is_on_stack(buf))
 806                         drive->dma = 0;
 807         }
 808 }
 809
 810 static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
 811                                         sector_t block)
 812 {
 813         struct ide_cmd cmd;
 814         int uptodate = 0, nsectors;
 815
 816         ide_debug_log(IDE_DBG_RQ, "cmd: 0x%x, block: %llu",
 817                                   rq->cmd[0], (unsigned long long)block);
 818
 819         if (drive->debug_mask & IDE_DBG_RQ)
 820                 blk_dump_rq_flags(rq, "ide_cd_do_request");
 821
 822         if (blk_fs_request(rq)) {
 823                 if (cdrom_start_rw(drive, rq) == ide_stopped)
 824                         goto out_end;
 825         } else if (blk_sense_request(rq) || blk_pc_request(rq) ||
 826                    rq->cmd_type == REQ_TYPE_ATA_PC) {
 827                 if (!rq->timeout)
 828                         rq->timeout = ATAPI_WAIT_PC;
 829
 830                 cdrom_do_block_pc(drive, rq);
 831         } else if (blk_special_request(rq)) {
 832                 /* right now this can only be a reset... */
 833                 uptodate = 1;
 834                 goto out_end;
 835         } else {
 836                 blk_dump_rq_flags(rq, DRV_NAME " bad flags");
 837                 if (rq->errors == 0)
 838                         rq->errors = -EIO;
 839                 goto out_end;
 840         }
 841
 842         /* prepare sense request for this command */
 843         ide_prep_sense(drive, rq);
 844
 845         memset(&cmd, 0, sizeof(cmd));
 846
 847         if (rq_data_dir(rq))
 848                 cmd.tf_flags |= IDE_TFLAG_WRITE;
 849
 850         cmd.rq = rq;
 851
 852         if (blk_fs_request(rq) || blk_rq_bytes(rq)) {
 853                 ide_init_sg_cmd(&cmd, blk_rq_bytes(rq));
 854                 ide_map_sg(drive, &cmd);
 855         }
 856
 857         return ide_issue_pc(drive, &cmd);
 858 out_end:
 859         nsectors = blk_rq_sectors(rq);
 860
 861         if (nsectors == 0)
 862                 nsectors = 1;
 863
 864         ide_complete_rq(drive, uptodate ? 0 : -EIO, nsectors << 9);
 865
 866         return ide_stopped;
 867 }
 868
 869 /*
 870  * Ioctl handling.
 871  *
 872  * Routines which queue packet commands take as a final argument a pointer to a
 873  * request_sense struct. If execution of the command results in an error with a
 874  * CHECK CONDITION status, this structure will be filled with the results of the
 875  * subsequent request sense command. The pointer can also be NULL, in which case
 876  * no sense information is returned.
 877  */
 878 static void msf_from_bcd(struct atapi_msf *msf)
 879 {
 880         msf->minute = bcd2bin(msf->minute);
 881         msf->second = bcd2bin(msf->second);
 882         msf->frame  = bcd2bin(msf->frame);
 883 }
 884
 885 int cdrom_check_status(ide_drive_t *drive, struct request_sense *sense)
 886 {
 887         struct cdrom_info *info = drive->driver_data;
 888         struct cdrom_device_info *cdi = &info->devinfo;
 889         unsigned char cmd[BLK_MAX_CDB];
 890
 891         ide_debug_log(IDE_DBG_FUNC, "enter");
 892
 893         memset(cmd, 0, BLK_MAX_CDB);
 894         cmd[0] = GPCMD_TEST_UNIT_READY;
 895
 896         /*
 897          * Sanyo 3 CD changer uses byte 7 of TEST_UNIT_READY to switch CDs
 898          * instead of supporting the LOAD_UNLOAD opcode.
 899          */
 900         cmd[7] = cdi->sanyo_slot % 3;
 901
 902         return ide_cd_queue_pc(drive, cmd, 0, NULL, NULL, sense, 0, REQ_QUIET);
 903 }
 904
 905 static int cdrom_read_capacity(ide_drive_t *drive, unsigned long *capacity,
 906                                unsigned long *sectors_per_frame,
 907                                struct request_sense *sense)
 908 {
 909         struct {
 910                 __be32 lba;
 911                 __be32 blocklen;
 912         } capbuf;
 913
 914         int stat;
 915         unsigned char cmd[BLK_MAX_CDB];
 916         unsigned len = sizeof(capbuf);
 917         u32 blocklen;
 918
 919         ide_debug_log(IDE_DBG_FUNC, "enter");
 920
 921         memset(cmd, 0, BLK_MAX_CDB);
 922         cmd[0] = GPCMD_READ_CDVD_CAPACITY;
 923
 924         stat = ide_cd_queue_pc(drive, cmd, 0, &capbuf, &len, sense, 0,
 925                                REQ_QUIET);
 926         if (stat)
 927                 return stat;
 928
 929         /*
 930          * Sanity check the given block size
 931          */
 932         blocklen = be32_to_cpu(capbuf.blocklen);
 933         switch (blocklen) {
 934         case 512:
 935         case 1024:
 936         case 2048:
 937         case 4096:
 938                 break;
 939         default:
 940                 printk(KERN_ERR PFX "%s: weird block size %u\n",
 941                                 drive->name, blocklen);
 942                 printk(KERN_ERR PFX "%s: default to 2kb block size\n",
 943                                 drive->name);
 944                 blocklen = 2048;
 945                 break;
 946         }
 947
 948         *capacity = 1 + be32_to_cpu(capbuf.lba);
 949         *sectors_per_frame = blocklen >> SECTOR_BITS;
 950
 951         ide_debug_log(IDE_DBG_PROBE, "cap: %lu, sectors_per_frame: %lu",
 952                                      *capacity, *sectors_per_frame);
 953
 954         return 0;
 955 }
 956
 957 static int cdrom_read_tocentry(ide_drive_t *drive, int trackno, int msf_flag,
 958                                 int format, char *buf, int buflen,
 959                                 struct request_sense *sense)
 960 {
 961         unsigned char cmd[BLK_MAX_CDB];
 962
 963         ide_debug_log(IDE_DBG_FUNC, "enter");
 964
 965         memset(cmd, 0, BLK_MAX_CDB);
 966
 967         cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
 968         cmd[6] = trackno;
 969         cmd[7] = (buflen >> 8);
 970         cmd[8] = (buflen & 0xff);
 971         cmd[9] = (format << 6);
 972
 973         if (msf_flag)
 974                 cmd[1] = 2;
 975
 976         return ide_cd_queue_pc(drive, cmd, 0, buf, &buflen, sense, 0, REQ_QUIET);
 977 }
 978
 979 /* Try to read the entire TOC for the disk into our internal buffer. */
 980 int ide_cd_read_toc(ide_drive_t *drive, struct request_sense *sense)
 981 {
 982         int stat, ntracks, i;
 983         struct cdrom_info *info = drive->driver_data;
 984         struct cdrom_device_info *cdi = &info->devinfo;
 985         struct atapi_toc *toc = info->toc;
 986         struct {
 987                 struct atapi_toc_header hdr;
 988                 struct atapi_toc_entry  ent;
 989         } ms_tmp;
 990         long last_written;
 991         unsigned long sectors_per_frame = SECTORS_PER_FRAME;
 992
 993         ide_debug_log(IDE_DBG_FUNC, "enter");
 994
 995         if (toc == NULL) {
 996                 /* try to allocate space */
 997                 toc = kmalloc(sizeof(struct atapi_toc), GFP_KERNEL);
 998                 if (toc == NULL) {
 999                         printk(KERN_ERR PFX "%s: No cdrom TOC buffer!\n",
1000                                         drive->name);
1001                         return -ENOMEM;
1002                 }
1003                 info->toc = toc;
1004         }
1005
1006         /*
1007          * Check to see if the existing data is still valid. If it is,
1008          * just return.
1009          */
1010         (void) cdrom_check_status(drive, sense);
1011
1012         if (drive->atapi_flags & IDE_AFLAG_TOC_VALID)
1013                 return 0;
1014
1015         /* try to get the total cdrom capacity and sector size */
1016         stat = cdrom_read_capacity(drive, &toc->capacity, &sectors_per_frame,
1017                                    sense);
1018         if (stat)
1019                 toc->capacity = 0x1fffff;
1020
1021         set_capacity(info->disk, toc->capacity * sectors_per_frame);
1022         /* save a private copy of the TOC capacity for error handling */
1023         drive->probed_capacity = toc->capacity * sectors_per_frame;
1024
1025         blk_queue_hardsect_size(drive->queue,
1026                                 sectors_per_frame << SECTOR_BITS);
1027
1028         /* first read just the header, so we know how long the TOC is */
1029         stat = cdrom_read_tocentry(drive, 0, 1, 0, (char *) &toc->hdr,
1030                                     sizeof(struct atapi_toc_header), sense);
1031         if (stat)
1032                 return stat;
1033
1034         if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
1035                 toc->hdr.first_track = bcd2bin(toc->hdr.first_track);
1036                 toc->hdr.last_track  = bcd2bin(toc->hdr.last_track);
1037         }
1038
1039         ntracks = toc->hdr.last_track - toc->hdr.first_track + 1;
1040         if (ntracks <= 0)
1041                 return -EIO;
1042         if (ntracks > MAX_TRACKS)
1043                 ntracks = MAX_TRACKS;
1044
1045         /* now read the whole schmeer */
1046         stat = cdrom_read_tocentry(drive, toc->hdr.first_track, 1, 0,
1047                                   (char *)&toc->hdr,
1048                                    sizeof(struct atapi_toc_header) +
1049                                    (ntracks + 1) *
1050                                    sizeof(struct atapi_toc_entry), sense);
1051
1052         if (stat && toc->hdr.first_track > 1) {
1053                 /*
1054                  * Cds with CDI tracks only don't have any TOC entries, despite
1055                  * of this the returned values are
1056                  * first_track == last_track = number of CDI tracks + 1,
1057                  * so that this case is indistinguishable from the same layout
1058                  * plus an additional audio track. If we get an error for the
1059                  * regular case, we assume a CDI without additional audio
1060                  * tracks. In this case the readable TOC is empty (CDI tracks
1061                  * are not included) and only holds the Leadout entry.
1062                  *
1063                  * Heiko Eißfeldt.
1064                  */
1065                 ntracks = 0;
1066                 stat = cdrom_read_tocentry(drive, CDROM_LEADOUT, 1, 0,
1067                                            (char *)&toc->hdr,
1068                                            sizeof(struct atapi_toc_header) +
1069                                            (ntracks + 1) *
1070                                            sizeof(struct atapi_toc_entry),
1071                                            sense);
1072                 if (stat)
1073                         return stat;
1074
1075                 if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
1076                         toc->hdr.first_track = (u8)bin2bcd(CDROM_LEADOUT);
1077                         toc->hdr.last_track = (u8)bin2bcd(CDROM_LEADOUT);
1078                 } else {
1079                         toc->hdr.first_track = CDROM_LEADOUT;
1080                         toc->hdr.last_track = CDROM_LEADOUT;
1081                 }
1082         }
1083
1084         if (stat)
1085                 return stat;
1086
1087         toc->hdr.toc_length = be16_to_cpu(toc->hdr.toc_length);
1088
1089         if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
1090                 toc->hdr.first_track = bcd2bin(toc->hdr.first_track);
1091                 toc->hdr.last_track  = bcd2bin(toc->hdr.last_track);
1092         }
1093
1094         for (i = 0; i <= ntracks; i++) {
1095                 if (drive->atapi_flags & IDE_AFLAG_TOCADDR_AS_BCD) {
1096                         if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD)
1097                                 toc->ent[i].track = bcd2bin(toc->ent[i].track);
1098                         msf_from_bcd(&toc->ent[i].addr.msf);
1099                 }
1100                 toc->ent[i].addr.lba = msf_to_lba(toc->ent[i].addr.msf.minute,
1101                                                   toc->ent[i].addr.msf.second,
1102                                                   toc->ent[i].addr.msf.frame);
1103         }
1104
1105         if (toc->hdr.first_track != CDROM_LEADOUT) {
1106                 /* read the multisession information */
1107                 stat = cdrom_read_tocentry(drive, 0, 0, 1, (char *)&ms_tmp,
1108                                            sizeof(ms_tmp), sense);
1109                 if (stat)
1110                         return stat;
1111
1112                 toc->last_session_lba = be32_to_cpu(ms_tmp.ent.addr.lba);
1113         } else {
1114                 ms_tmp.hdr.last_track = CDROM_LEADOUT;
1115                 ms_tmp.hdr.first_track = ms_tmp.hdr.last_track;
1116                 toc->last_session_lba = msf_to_lba(0, 2, 0); /* 0m 2s 0f */
1117         }
1118
1119         if (drive->atapi_flags & IDE_AFLAG_TOCADDR_AS_BCD) {
1120                 /* re-read multisession information using MSF format */
1121                 stat = cdrom_read_tocentry(drive, 0, 1, 1, (char *)&ms_tmp,
1122                                            sizeof(ms_tmp), sense);
1123                 if (stat)
1124                         return stat;
1125
1126                 msf_from_bcd(&ms_tmp.ent.addr.msf);
1127                 toc->last_session_lba = msf_to_lba(ms_tmp.ent.addr.msf.minute,
1128                                                    ms_tmp.ent.addr.msf.second,
1129                                                    ms_tmp.ent.addr.msf.frame);
1130         }
1131
1132         toc->xa_flag = (ms_tmp.hdr.first_track != ms_tmp.hdr.last_track);
1133
1134         /* now try to get the total cdrom capacity */
1135         stat = cdrom_get_last_written(cdi, &last_written);
1136         if (!stat && (last_written > toc->capacity)) {
1137                 toc->capacity = last_written;
1138                 set_capacity(info->disk, toc->capacity * sectors_per_frame);
1139                 drive->probed_capacity = toc->capacity * sectors_per_frame;
1140         }
1141
1142         /* Remember that we've read this stuff. */
1143         drive->atapi_flags |= IDE_AFLAG_TOC_VALID;
1144
1145         return 0;
1146 }
1147
1148 int ide_cdrom_get_capabilities(ide_drive_t *drive, u8 *buf)
1149 {
1150         struct cdrom_info *info = drive->driver_data;
1151         struct cdrom_device_info *cdi = &info->devinfo;
1152         struct packet_command cgc;
1153         int stat, attempts = 3, size = ATAPI_CAPABILITIES_PAGE_SIZE;
1154
1155         ide_debug_log(IDE_DBG_FUNC, "enter");
1156
1157         if ((drive->atapi_flags & IDE_AFLAG_FULL_CAPS_PAGE) == 0)
1158                 size -= ATAPI_CAPABILITIES_PAGE_PAD_SIZE;
1159
1160         init_cdrom_command(&cgc, buf, size, CGC_DATA_UNKNOWN);
1161         do {
1162                 /* we seem to get stat=0x01,err=0x00 the first time (??) */
1163                 stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1164                 if (!stat)
1165                         break;
1166         } while (--attempts);
1167         return stat;
1168 }
1169
1170 void ide_cdrom_update_speed(ide_drive_t *drive, u8 *buf)
1171 {
1172         struct cdrom_info *cd = drive->driver_data;
1173         u16 curspeed, maxspeed;
1174
1175         ide_debug_log(IDE_DBG_FUNC, "enter");
1176
1177         if (drive->atapi_flags & IDE_AFLAG_LE_SPEED_FIELDS) {
1178                 curspeed = le16_to_cpup((__le16 *)&buf[8 + 14]);
1179                 maxspeed = le16_to_cpup((__le16 *)&buf[8 + 8]);
1180         } else {
1181                 curspeed = be16_to_cpup((__be16 *)&buf[8 + 14]);
1182                 maxspeed = be16_to_cpup((__be16 *)&buf[8 + 8]);
1183         }
1184
1185         ide_debug_log(IDE_DBG_PROBE, "curspeed: %u, maxspeed: %u",
1186                                      curspeed, maxspeed);
1187
1188         cd->current_speed = (curspeed + (176/2)) / 176;
1189         cd->max_speed = (maxspeed + (176/2)) / 176;
1190 }
1191
1192 #define IDE_CD_CAPABILITIES \
1193         (CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK | CDC_SELECT_SPEED | \
1194          CDC_SELECT_DISC | CDC_MULTI_SESSION | CDC_MCN | CDC_MEDIA_CHANGED | \
1195          CDC_PLAY_AUDIO | CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R | \
1196          CDC_CD_RW | CDC_DVD | CDC_DVD_R | CDC_DVD_RAM | CDC_GENERIC_PACKET | \
1197          CDC_MO_DRIVE | CDC_MRW | CDC_MRW_W | CDC_RAM)
1198
1199 static struct cdrom_device_ops ide_cdrom_dops = {
1200         .open                   = ide_cdrom_open_real,
1201         .release                = ide_cdrom_release_real,
1202         .drive_status           = ide_cdrom_drive_status,
1203         .media_changed          = ide_cdrom_check_media_change_real,
1204         .tray_move              = ide_cdrom_tray_move,
1205         .lock_door              = ide_cdrom_lock_door,
1206         .select_speed           = ide_cdrom_select_speed,
1207         .get_last_session       = ide_cdrom_get_last_session,
1208         .get_mcn                = ide_cdrom_get_mcn,
1209         .reset                  = ide_cdrom_reset,
1210         .audio_ioctl            = ide_cdrom_audio_ioctl,
1211         .capability             = IDE_CD_CAPABILITIES,
1212         .generic_packet         = ide_cdrom_packet,
1213 };
1214
1215 static int ide_cdrom_register(ide_drive_t *drive, int nslots)
1216 {
1217         struct cdrom_info *info = drive->driver_data;
1218         struct cdrom_device_info *devinfo = &info->devinfo;
1219
1220         ide_debug_log(IDE_DBG_PROBE, "nslots: %d", nslots);
1221
1222         devinfo->ops = &ide_cdrom_dops;
1223         devinfo->speed = info->current_speed;
1224         devinfo->capacity = nslots;
1225         devinfo->handle = drive;
1226         strcpy(devinfo->name, drive->name);
1227
1228         if (drive->atapi_flags & IDE_AFLAG_NO_SPEED_SELECT)
1229                 devinfo->mask |= CDC_SELECT_SPEED;
1230
1231         devinfo->disk = info->disk;
1232         return register_cdrom(devinfo);
1233 }
1234
1235 static int ide_cdrom_probe_capabilities(ide_drive_t *drive)
1236 {
1237         struct cdrom_info *cd = drive->driver_data;
1238         struct cdrom_device_info *cdi = &cd->devinfo;
1239         u8 buf[ATAPI_CAPABILITIES_PAGE_SIZE];
1240         mechtype_t mechtype;
1241         int nslots = 1;
1242
1243         ide_debug_log(IDE_DBG_PROBE, "media: 0x%x, atapi_flags: 0x%lx",
1244                                      drive->media, drive->atapi_flags);
1245
1246         cdi->mask = (CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R |
1247                      CDC_DVD_RAM | CDC_SELECT_DISC | CDC_PLAY_AUDIO |
1248                      CDC_MO_DRIVE | CDC_RAM);
1249
1250         if (drive->media == ide_optical) {
1251                 cdi->mask &= ~(CDC_MO_DRIVE | CDC_RAM);
1252                 printk(KERN_ERR PFX "%s: ATAPI magneto-optical drive\n",
1253                                 drive->name);
1254                 return nslots;
1255         }
1256
1257         if (drive->atapi_flags & IDE_AFLAG_PRE_ATAPI12) {
1258                 drive->atapi_flags &= ~IDE_AFLAG_NO_EJECT;
1259                 cdi->mask &= ~CDC_PLAY_AUDIO;
1260                 return nslots;
1261         }
1262
1263         /*
1264          * We have to cheat a little here. the packet will eventually be queued
1265          * with ide_cdrom_packet(), which extracts the drive from cdi->handle.
1266          * Since this device hasn't been registered with the Uniform layer yet,
1267          * it can't do this. Same goes for cdi->ops.
1268          */
1269         cdi->handle = drive;
1270         cdi->ops = &ide_cdrom_dops;
1271
1272         if (ide_cdrom_get_capabilities(drive, buf))
1273                 return 0;
1274
1275         if ((buf[8 + 6] & 0x01) == 0)
1276                 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
1277         if (buf[8 + 6] & 0x08)
1278                 drive->atapi_flags &= ~IDE_AFLAG_NO_EJECT;
1279         if (buf[8 + 3] & 0x01)
1280                 cdi->mask &= ~CDC_CD_R;
1281         if (buf[8 + 3] & 0x02)
1282                 cdi->mask &= ~(CDC_CD_RW | CDC_RAM);
1283         if (buf[8 + 2] & 0x38)
1284                 cdi->mask &= ~CDC_DVD;
1285         if (buf[8 + 3] & 0x20)
1286                 cdi->mask &= ~(CDC_DVD_RAM | CDC_RAM);
1287         if (buf[8 + 3] & 0x10)
1288                 cdi->mask &= ~CDC_DVD_R;
1289         if ((buf[8 + 4] & 0x01) || (drive->atapi_flags & IDE_AFLAG_PLAY_AUDIO_OK))
1290                 cdi->mask &= ~CDC_PLAY_AUDIO;
1291
1292         mechtype = buf[8 + 6] >> 5;
1293         if (mechtype == mechtype_caddy ||
1294             mechtype == mechtype_popup ||
1295             (drive->atapi_flags & IDE_AFLAG_NO_AUTOCLOSE))
1296                 cdi->mask |= CDC_CLOSE_TRAY;
1297
1298         if (cdi->sanyo_slot > 0) {
1299                 cdi->mask &= ~CDC_SELECT_DISC;
1300                 nslots = 3;
1301         } else if (mechtype == mechtype_individual_changer ||
1302                    mechtype == mechtype_cartridge_changer) {
1303                 nslots = cdrom_number_of_slots(cdi);
1304                 if (nslots > 1)
1305                         cdi->mask &= ~CDC_SELECT_DISC;
1306         }
1307
1308         ide_cdrom_update_speed(drive, buf);
1309
1310         printk(KERN_INFO PFX "%s: ATAPI", drive->name);
1311
1312         /* don't print speed if the drive reported 0 */
1313         if (cd->max_speed)
1314                 printk(KERN_CONT " %dX", cd->max_speed);
1315
1316         printk(KERN_CONT " %s", (cdi->mask & CDC_DVD) ? "CD-ROM" : "DVD-ROM");
1317
1318         if ((cdi->mask & CDC_DVD_R) == 0 || (cdi->mask & CDC_DVD_RAM) == 0)
1319                 printk(KERN_CONT " DVD%s%s",
1320                                  (cdi->mask & CDC_DVD_R) ? "" : "-R",
1321                                  (cdi->mask & CDC_DVD_RAM) ? "" : "/RAM");
1322
1323         if ((cdi->mask & CDC_CD_R) == 0 || (cdi->mask & CDC_CD_RW) == 0)
1324                 printk(KERN_CONT " CD%s%s",
1325                                  (cdi->mask & CDC_CD_R) ? "" : "-R",
1326                                  (cdi->mask & CDC_CD_RW) ? "" : "/RW");
1327
1328         if ((cdi->mask & CDC_SELECT_DISC) == 0)
1329                 printk(KERN_CONT " changer w/%d slots", nslots);
1330         else
1331                 printk(KERN_CONT " drive");
1332
1333         printk(KERN_CONT ", %dkB Cache\n",
1334                          be16_to_cpup((__be16 *)&buf[8 + 12]));
1335
1336         return nslots;
1337 }
1338
1339 /* standard prep_rq_fn that builds 10 byte cmds */
1340 static int ide_cdrom_prep_fs(struct request_queue *q, struct request *rq)
1341 {
1342         int hard_sect = queue_hardsect_size(q);
1343         long block = (long)blk_rq_pos(rq) / (hard_sect >> 9);
1344         unsigned long blocks = blk_rq_sectors(rq) / (hard_sect >> 9);
1345
1346         memset(rq->cmd, 0, BLK_MAX_CDB);
1347
1348         if (rq_data_dir(rq) == READ)
1349                 rq->cmd[0] = GPCMD_READ_10;
1350         else
1351                 rq->cmd[0] = GPCMD_WRITE_10;
1352
1353         /*
1354          * fill in lba
1355          */
1356         rq->cmd[2] = (block >> 24) & 0xff;
1357         rq->cmd[3] = (block >> 16) & 0xff;
1358         rq->cmd[4] = (block >>  8) & 0xff;
1359         rq->cmd[5] = block & 0xff;
1360
1361         /*
1362          * and transfer length
1363          */
1364         rq->cmd[7] = (blocks >> 8) & 0xff;
1365         rq->cmd[8] = blocks & 0xff;
1366         rq->cmd_len = 10;
1367         return BLKPREP_OK;
1368 }
1369
1370 /*
1371  * Most of the SCSI commands are supported directly by ATAPI devices.
1372  * This transform handles the few exceptions.
1373  */
1374 static int ide_cdrom_prep_pc(struct request *rq)
1375 {
1376         u8 *c = rq->cmd;
1377
1378         /* transform 6-byte read/write commands to the 10-byte version */
1379         if (c[0] == READ_6 || c[0] == WRITE_6) {
1380                 c[8] = c[4];
1381                 c[5] = c[3];
1382                 c[4] = c[2];
1383                 c[3] = c[1] & 0x1f;
1384                 c[2] = 0;
1385                 c[1] &= 0xe0;
1386                 c[0] += (READ_10 - READ_6);
1387                 rq->cmd_len = 10;
1388                 return BLKPREP_OK;
1389         }
1390
1391         /*
1392          * it's silly to pretend we understand 6-byte sense commands, just
1393          * reject with ILLEGAL_REQUEST and the caller should take the
1394          * appropriate action
1395          */
1396         if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
1397                 rq->errors = ILLEGAL_REQUEST;
1398                 return BLKPREP_KILL;
1399         }
1400
1401         return BLKPREP_OK;
1402 }
1403
1404 static int ide_cdrom_prep_fn(struct request_queue *q, struct request *rq)
1405 {
1406         if (blk_fs_request(rq))
1407                 return ide_cdrom_prep_fs(q, rq);
1408         else if (blk_pc_request(rq))
1409                 return ide_cdrom_prep_pc(rq);
1410
1411         return 0;
1412 }
1413
1414 struct cd_list_entry {
1415         const char      *id_model;
1416         const char      *id_firmware;
1417         unsigned int    cd_flags;
1418 };
1419
1420 #ifdef CONFIG_IDE_PROC_FS
1421 static sector_t ide_cdrom_capacity(ide_drive_t *drive)
1422 {
1423         unsigned long capacity, sectors_per_frame;
1424
1425         if (cdrom_read_capacity(drive, &capacity, &sectors_per_frame, NULL))
1426                 return 0;
1427
1428         return capacity * sectors_per_frame;
1429 }
1430
1431 static int proc_idecd_read_capacity(char *page, char **start, off_t off,
1432                                         int count, int *eof, void *data)
1433 {
1434         ide_drive_t *drive = data;
1435         int len;
1436
1437         len = sprintf(page, "%llu\n", (long long)ide_cdrom_capacity(drive));
1438         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
1439 }
1440
1441 static ide_proc_entry_t idecd_proc[] = {
1442         { "capacity", S_IFREG|S_IRUGO, proc_idecd_read_capacity, NULL },
1443         { NULL, 0, NULL, NULL }
1444 };
1445
1446 static ide_proc_entry_t *ide_cd_proc_entries(ide_drive_t *drive)
1447 {
1448         return idecd_proc;
1449 }
1450
1451 static const struct ide_proc_devset *ide_cd_proc_devsets(ide_drive_t *drive)
1452 {
1453         return NULL;
1454 }
1455 #endif
1456
1457 static const struct cd_list_entry ide_cd_quirks_list[] = {
1458         /* SCR-3231 doesn't support the SET_CD_SPEED command. */
1459         { "SAMSUNG CD-ROM SCR-3231", NULL,   IDE_AFLAG_NO_SPEED_SELECT       },
1460         /* Old NEC260 (not R) was released before ATAPI 1.2 spec. */
1461         { "NEC CD-ROM DRIVE:260",    "1.01", IDE_AFLAG_TOCADDR_AS_BCD |
1462                                              IDE_AFLAG_PRE_ATAPI12,          },
1463         /* Vertos 300, some versions of this drive like to talk BCD. */
1464         { "V003S0DS",                NULL,   IDE_AFLAG_VERTOS_300_SSD,       },
1465         /* Vertos 600 ESD. */
1466         { "V006E0DS",                NULL,   IDE_AFLAG_VERTOS_600_ESD,       },
1467         /*
1468          * Sanyo 3 CD changer uses a non-standard command for CD changing
1469          * (by default standard ATAPI support for CD changers is used).
1470          */
1471         { "CD-ROM CDR-C3 G",         NULL,   IDE_AFLAG_SANYO_3CD             },
1472         { "CD-ROM CDR-C3G",          NULL,   IDE_AFLAG_SANYO_3CD             },
1473         { "CD-ROM CDR_C36",          NULL,   IDE_AFLAG_SANYO_3CD             },
1474         /* Stingray 8X CD-ROM. */
1475         { "STINGRAY 8422 IDE 8X CD-ROM 7-27-95", NULL, IDE_AFLAG_PRE_ATAPI12 },
1476         /*
1477          * ACER 50X CD-ROM and WPI 32X CD-ROM require the full spec length
1478          * mode sense page capabilities size, but older drives break.
1479          */
1480         { "ATAPI CD ROM DRIVE 50X MAX", NULL,   IDE_AFLAG_FULL_CAPS_PAGE     },
1481         { "WPI CDS-32X",                NULL,   IDE_AFLAG_FULL_CAPS_PAGE     },
1482         /* ACER/AOpen 24X CD-ROM has the speed fields byte-swapped. */
1483         { "",                        "241N", IDE_AFLAG_LE_SPEED_FIELDS       },
1484         /*
1485          * Some drives used by Apple don't advertise audio play
1486          * but they do support reading TOC & audio datas.
1487          */
1488         { "MATSHITADVD-ROM SR-8187", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1489         { "MATSHITADVD-ROM SR-8186", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1490         { "MATSHITADVD-ROM SR-8176", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1491         { "MATSHITADVD-ROM SR-8174", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1492         { "Optiarc DVD RW AD-5200A", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1493         { "Optiarc DVD RW AD-7200A", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1494         { "Optiarc DVD RW AD-7543A", NULL,   IDE_AFLAG_NO_AUTOCLOSE          },
1495         { "TEAC CD-ROM CD-224E",     NULL,   IDE_AFLAG_NO_AUTOCLOSE          },
1496         { NULL, NULL, 0 }
1497 };
1498
1499 static unsigned int ide_cd_flags(u16 *id)
1500 {
1501         const struct cd_list_entry *cle = ide_cd_quirks_list;
1502
1503         while (cle->id_model) {
1504                 if (strcmp(cle->id_model, (char *)&id[ATA_ID_PROD]) == 0 &&
1505                     (cle->id_firmware == NULL ||
1506                      strstr((char *)&id[ATA_ID_FW_REV], cle->id_firmware)))
1507                         return cle->cd_flags;
1508                 cle++;
1509         }
1510
1511         return 0;
1512 }
1513
1514 static int ide_cdrom_setup(ide_drive_t *drive)
1515 {
1516         struct cdrom_info *cd = drive->driver_data;
1517         struct cdrom_device_info *cdi = &cd->devinfo;
1518         struct request_queue *q = drive->queue;
1519         u16 *id = drive->id;
1520         char *fw_rev = (char *)&id[ATA_ID_FW_REV];
1521         int nslots;
1522
1523         ide_debug_log(IDE_DBG_PROBE, "enter");
1524
1525         blk_queue_prep_rq(q, ide_cdrom_prep_fn);
1526         blk_queue_dma_alignment(q, 31);
1527         blk_queue_update_dma_pad(q, 15);
1528
1529         q->unplug_delay = max((1 * HZ) / 1000, 1);
1530
1531         drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;
1532         drive->atapi_flags = IDE_AFLAG_NO_EJECT | ide_cd_flags(id);
1533
1534         if ((drive->atapi_flags & IDE_AFLAG_VERTOS_300_SSD) &&
1535             fw_rev[4] == '1' && fw_rev[6] <= '2')
1536                 drive->atapi_flags |= (IDE_AFLAG_TOCTRACKS_AS_BCD |
1537                                      IDE_AFLAG_TOCADDR_AS_BCD);
1538         else if ((drive->atapi_flags & IDE_AFLAG_VERTOS_600_ESD) &&
1539                  fw_rev[4] == '1' && fw_rev[6] <= '2')
1540                 drive->atapi_flags |= IDE_AFLAG_TOCTRACKS_AS_BCD;
1541         else if (drive->atapi_flags & IDE_AFLAG_SANYO_3CD)
1542                 /* 3 => use CD in slot 0 */
1543                 cdi->sanyo_slot = 3;
1544
1545         nslots = ide_cdrom_probe_capabilities(drive);
1546
1547         blk_queue_hardsect_size(q, CD_FRAMESIZE);
1548
1549         if (ide_cdrom_register(drive, nslots)) {
1550                 printk(KERN_ERR PFX "%s: %s failed to register device with the"
1551                                 " cdrom driver.\n", drive->name, __func__);
1552                 cd->devinfo.handle = NULL;
1553                 return 1;
1554         }
1555
1556         ide_proc_register_driver(drive, cd->driver);
1557         return 0;
1558 }
1559
1560 static void ide_cd_remove(ide_drive_t *drive)
1561 {
1562         struct cdrom_info *info = drive->driver_data;
1563
1564         ide_debug_log(IDE_DBG_FUNC, "enter");
1565
1566         ide_proc_unregister_driver(drive, info->driver);
1567         device_del(&info->dev);
1568         del_gendisk(info->disk);
1569
1570         mutex_lock(&idecd_ref_mutex);
1571         put_device(&info->dev);
1572         mutex_unlock(&idecd_ref_mutex);
1573 }
1574
1575 static void ide_cd_release(struct device *dev)
1576 {
1577         struct cdrom_info *info = to_ide_drv(dev, cdrom_info);
1578         struct cdrom_device_info *devinfo = &info->devinfo;
1579         ide_drive_t *drive = info->drive;
1580         struct gendisk *g = info->disk;
1581
1582         ide_debug_log(IDE_DBG_FUNC, "enter");
1583
1584         kfree(info->toc);
1585         if (devinfo->handle == drive)
1586                 unregister_cdrom(devinfo);
1587         drive->driver_data = NULL;
1588         blk_queue_prep_rq(drive->queue, NULL);
1589         g->private_data = NULL;
1590         put_disk(g);
1591         kfree(info);
1592 }
1593
1594 static int ide_cd_probe(ide_drive_t *);
1595
1596 static struct ide_driver ide_cdrom_driver = {
1597         .gen_driver = {
1598                 .owner          = THIS_MODULE,
1599                 .name           = "ide-cdrom",
1600                 .bus            = &ide_bus_type,
1601         },
1602         .probe                  = ide_cd_probe,
1603         .remove                 = ide_cd_remove,
1604         .version                = IDECD_VERSION,
1605         .do_request             = ide_cd_do_request,
1606 #ifdef CONFIG_IDE_PROC_FS
1607         .proc_entries           = ide_cd_proc_entries,
1608         .proc_devsets           = ide_cd_proc_devsets,
1609 #endif
1610 };
1611
1612 static int idecd_open(struct block_device *bdev, fmode_t mode)
1613 {
1614         struct cdrom_info *info = ide_cd_get(bdev->bd_disk);
1615         int rc = -ENOMEM;
1616
1617         if (!info)
1618                 return -ENXIO;
1619
1620         rc = cdrom_open(&info->devinfo, bdev, mode);
1621
1622         if (rc < 0)
1623                 ide_cd_put(info);
1624
1625         return rc;
1626 }
1627
1628 static int idecd_release(struct gendisk *disk, fmode_t mode)
1629 {
1630         struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
1631
1632         cdrom_release(&info->devinfo, mode);
1633
1634         ide_cd_put(info);
1635
1636         return 0;
1637 }
1638
1639 static int idecd_set_spindown(struct cdrom_device_info *cdi, unsigned long arg)
1640 {
1641         struct packet_command cgc;
1642         char buffer[16];
1643         int stat;
1644         char spindown;
1645
1646         if (copy_from_user(&spindown, (void __user *)arg, sizeof(char)))
1647                 return -EFAULT;
1648
1649         init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_UNKNOWN);
1650
1651         stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CDROM_PAGE, 0);
1652         if (stat)
1653                 return stat;
1654
1655         buffer[11] = (buffer[11] & 0xf0) | (spindown & 0x0f);
1656         return cdrom_mode_select(cdi, &cgc);
1657 }
1658
1659 static int idecd_get_spindown(struct cdrom_device_info *cdi, unsigned long arg)
1660 {
1661         struct packet_command cgc;
1662         char buffer[16];
1663         int stat;
1664         char spindown;
1665
1666         init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_UNKNOWN);
1667
1668         stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CDROM_PAGE, 0);
1669         if (stat)
1670                 return stat;
1671
1672         spindown = buffer[11] & 0x0f;
1673         if (copy_to_user((void __user *)arg, &spindown, sizeof(char)))
1674                 return -EFAULT;
1675         return 0;
1676 }
1677
1678 static int idecd_ioctl(struct block_device *bdev, fmode_t mode,
1679                         unsigned int cmd, unsigned long arg)
1680 {
1681         struct cdrom_info *info = ide_drv_g(bdev->bd_disk, cdrom_info);
1682         int err;
1683
1684         switch (cmd) {
1685         case CDROMSETSPINDOWN:
1686                 return idecd_set_spindown(&info->devinfo, arg);
1687         case CDROMGETSPINDOWN:
1688                 return idecd_get_spindown(&info->devinfo, arg);
1689         default:
1690                 break;
1691         }
1692
1693         err = generic_ide_ioctl(info->drive, bdev, cmd, arg);
1694         if (err == -EINVAL)
1695                 err = cdrom_ioctl(&info->devinfo, bdev, mode, cmd, arg);
1696
1697         return err;
1698 }
1699
1700 static int idecd_media_changed(struct gendisk *disk)
1701 {
1702         struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
1703         return cdrom_media_changed(&info->devinfo);
1704 }
1705
1706 static int idecd_revalidate_disk(struct gendisk *disk)
1707 {
1708         struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
1709         struct request_sense sense;
1710
1711         ide_cd_read_toc(info->drive, &sense);
1712
1713         return  0;
1714 }
1715
1716 static struct block_device_operations idecd_ops = {
1717         .owner                  = THIS_MODULE,
1718         .open                   = idecd_open,
1719         .release                = idecd_release,
1720         .locked_ioctl           = idecd_ioctl,
1721         .media_changed          = idecd_media_changed,
1722         .revalidate_disk        = idecd_revalidate_disk
1723 };
1724
1725 /* module options */
1726 static unsigned long debug_mask;
1727 module_param(debug_mask, ulong, 0644);
1728
1729 MODULE_DESCRIPTION("ATAPI CD-ROM Driver");
1730
1731 static int ide_cd_probe(ide_drive_t *drive)
1732 {
1733         struct cdrom_info *info;
1734         struct gendisk *g;
1735         struct request_sense sense;
1736
1737         ide_debug_log(IDE_DBG_PROBE, "driver_req: %s, media: 0x%x",
1738                                      drive->driver_req, drive->media);
1739
1740         if (!strstr("ide-cdrom", drive->driver_req))
1741                 goto failed;
1742
1743         if (drive->media != ide_cdrom && drive->media != ide_optical)
1744                 goto failed;
1745
1746         drive->debug_mask = debug_mask;
1747         drive->irq_handler = cdrom_newpc_intr;
1748
1749         info = kzalloc(sizeof(struct cdrom_info), GFP_KERNEL);
1750         if (info == NULL) {
1751                 printk(KERN_ERR PFX "%s: Can't allocate a cdrom structure\n",
1752                                 drive->name);
1753                 goto failed;
1754         }
1755
1756         g = alloc_disk(1 << PARTN_BITS);
1757         if (!g)
1758                 goto out_free_cd;
1759
1760         ide_init_disk(g, drive);
1761
1762         info->dev.parent = &drive->gendev;
1763         info->dev.release = ide_cd_release;
1764         dev_set_name(&info->dev, dev_name(&drive->gendev));
1765
1766         if (device_register(&info->dev))
1767                 goto out_free_disk;
1768
1769         info->drive = drive;
1770         info->driver = &ide_cdrom_driver;
1771         info->disk = g;
1772
1773         g->private_data = &info->driver;
1774
1775         drive->driver_data = info;
1776
1777         g->minors = 1;
1778         g->driverfs_dev = &drive->gendev;
1779         g->flags = GENHD_FL_CD | GENHD_FL_REMOVABLE;
1780         if (ide_cdrom_setup(drive)) {
1781                 put_device(&info->dev);
1782                 goto failed;
1783         }
1784
1785         ide_cd_read_toc(drive, &sense);
1786         g->fops = &idecd_ops;
1787         g->flags |= GENHD_FL_REMOVABLE;
1788         add_disk(g);
1789         return 0;
1790
1791 out_free_disk:
1792         put_disk(g);
1793 out_free_cd:
1794         kfree(info);
1795 failed:
1796         return -ENODEV;
1797 }
1798
1799 static void __exit ide_cdrom_exit(void)
1800 {
1801         driver_unregister(&ide_cdrom_driver.gen_driver);
1802 }
1803
1804 static int __init ide_cdrom_init(void)
1805 {
1806         printk(KERN_INFO DRV_NAME " driver " IDECD_VERSION "\n");
1807         return driver_register(&ide_cdrom_driver.gen_driver);
1808 }
1809
1810 MODULE_ALIAS("ide:*m-cdrom*");
1811 MODULE_ALIAS("ide-cd");
1812 module_init(ide_cdrom_init);
1813 module_exit(ide_cdrom_exit);
1814 MODULE_LICENSE("GPL");