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

   1 /*
   2  * ATAPI CD-ROM driver.
   3  *
   4  * Copyright (C) 1994-1996   Scott Snyder <snyder@fnald0.fnal.gov>
   5  * Copyright (C) 1996-1998   Erik Andersen <andersee@debian.org>
   6  * Copyright (C) 1998-2000   Jens Axboe <axboe@suse.de>
   7  * Copyright (C) 2005, 2007-2009  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                 struct request_queue *q = drive->queue;
 409                 unsigned long flags;
 410
 411                 spin_lock_irqsave(q->queue_lock, flags);
 412                 blkdev_dequeue_request(rq);
 413                 spin_unlock_irqrestore(q->queue_lock, flags);
 414
 415                 hwif->rq = NULL;
 416
 417                 return ide_queue_sense_rq(drive, rq) ? 2 : 1;
 418         } else
 419                 return 2;
 420 }
 421
 422 /*
 423  * Check the contents of the interrupt reason register from the cdrom
 424  * and attempt to recover if there are problems.  Returns  0 if everything's
 425  * ok; nonzero if the request has been terminated.
 426  */
 427 static int ide_cd_check_ireason(ide_drive_t *drive, struct request *rq,
 428                                 int len, int ireason, int rw)
 429 {
 430         ide_hwif_t *hwif = drive->hwif;
 431
 432         ide_debug_log(IDE_DBG_FUNC, "ireason: 0x%x, rw: 0x%x", ireason, rw);
 433
 434         /*
 435          * ireason == 0: the drive wants to receive data from us
 436          * ireason == 2: the drive is expecting to transfer data to us
 437          */
 438         if (ireason == (!rw << 1))
 439                 return 0;
 440         else if (ireason == (rw << 1)) {
 441
 442                 /* whoops... */
 443                 printk(KERN_ERR PFX "%s: %s: wrong transfer direction!\n",
 444                                 drive->name, __func__);
 445
 446                 ide_pad_transfer(drive, rw, len);
 447         } else  if (rw == 0 && ireason == 1) {
 448                 /*
 449                  * Some drives (ASUS) seem to tell us that status info is
 450                  * available.  Just get it and ignore.
 451                  */
 452                 (void)hwif->tp_ops->read_status(hwif);
 453                 return 0;
 454         } else {
 455                 /* drive wants a command packet, or invalid ireason... */
 456                 printk(KERN_ERR PFX "%s: %s: bad interrupt reason 0x%02x\n",
 457                                 drive->name, __func__, ireason);
 458         }
 459
 460         if (rq->cmd_type == REQ_TYPE_ATA_PC)
 461                 rq->cmd_flags |= REQ_FAILED;
 462
 463         return -1;
 464 }
 465
 466 static void ide_cd_request_sense_fixup(ide_drive_t *drive, struct ide_cmd *cmd)
 467 {
 468         struct request *rq = cmd->rq;
 469
 470         ide_debug_log(IDE_DBG_FUNC, "rq->cmd[0]: 0x%x", rq->cmd[0]);
 471
 472         /*
 473          * Some of the trailing request sense fields are optional,
 474          * and some drives don't send them.  Sigh.
 475          */
 476         if (rq->cmd[0] == GPCMD_REQUEST_SENSE &&
 477             cmd->nleft > 0 && cmd->nleft <= 5)
 478                 cmd->nleft = 0;
 479 }
 480
 481 int ide_cd_queue_pc(ide_drive_t *drive, const unsigned char *cmd,
 482                     int write, void *buffer, unsigned *bufflen,
 483                     struct request_sense *sense, int timeout,
 484                     unsigned int cmd_flags)
 485 {
 486         struct cdrom_info *info = drive->driver_data;
 487         struct request_sense local_sense;
 488         int retries = 10;
 489         unsigned int flags = 0;
 490
 491         if (!sense)
 492                 sense = &local_sense;
 493
 494         ide_debug_log(IDE_DBG_PC, "cmd[0]: 0x%x, write: 0x%x, timeout: %d, "
 495                                   "cmd_flags: 0x%x",
 496                                   cmd[0], write, timeout, cmd_flags);
 497
 498         /* start of retry loop */
 499         do {
 500                 struct request *rq;
 501                 int error;
 502
 503                 rq = blk_get_request(drive->queue, write, __GFP_WAIT);
 504
 505                 memcpy(rq->cmd, cmd, BLK_MAX_CDB);
 506                 rq->cmd_type = REQ_TYPE_ATA_PC;
 507                 rq->sense = sense;
 508                 rq->cmd_flags |= cmd_flags;
 509                 rq->timeout = timeout;
 510                 if (buffer) {
 511                         error = blk_rq_map_kern(drive->queue, rq, buffer,
 512                                                 *bufflen, GFP_NOIO);
 513                         if (error) {
 514                                 blk_put_request(rq);
 515                                 return error;
 516                         }
 517                 }
 518
 519                 error = blk_execute_rq(drive->queue, info->disk, rq, 0);
 520
 521                 if (buffer)
 522                         *bufflen = rq->resid_len;
 523
 524                 flags = rq->cmd_flags;
 525                 blk_put_request(rq);
 526
 527                 /*
 528                  * FIXME: we should probably abort/retry or something in case of
 529                  * failure.
 530                  */
 531                 if (flags & REQ_FAILED) {
 532                         /*
 533                          * The request failed.  Retry if it was due to a unit
 534                          * attention status (usually means media was changed).
 535                          */
 536                         struct request_sense *reqbuf = sense;
 537
 538                         if (reqbuf->sense_key == UNIT_ATTENTION)
 539                                 cdrom_saw_media_change(drive);
 540                         else if (reqbuf->sense_key == NOT_READY &&
 541                                  reqbuf->asc == 4 && reqbuf->ascq != 4) {
 542                                 /*
 543                                  * The drive is in the process of loading
 544                                  * a disk.  Retry, but wait a little to give
 545                                  * the drive time to complete the load.
 546                                  */
 547                                 ssleep(2);
 548                         } else {
 549                                 /* otherwise, don't retry */
 550                                 retries = 0;
 551                         }
 552                         --retries;
 553                 }
 554
 555                 /* end of retry loop */
 556         } while ((flags & REQ_FAILED) && retries >= 0);
 557
 558         /* return an error if the command failed */
 559         return (flags & REQ_FAILED) ? -EIO : 0;
 560 }
 561
 562 static void ide_cd_error_cmd(ide_drive_t *drive, struct ide_cmd *cmd)
 563 {
 564         unsigned int nr_bytes = cmd->nbytes - cmd->nleft;
 565
 566         if (cmd->tf_flags & IDE_TFLAG_WRITE)
 567                 nr_bytes -= cmd->last_xfer_len;
 568
 569         if (nr_bytes > 0)
 570                 ide_complete_rq(drive, 0, nr_bytes);
 571 }
 572
 573 static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
 574 {
 575         ide_hwif_t *hwif = drive->hwif;
 576         struct ide_cmd *cmd = &hwif->cmd;
 577         struct request *rq = hwif->rq;
 578         ide_expiry_t *expiry = NULL;
 579         int dma_error = 0, dma, thislen, uptodate = 0;
 580         int write = (rq_data_dir(rq) == WRITE) ? 1 : 0, rc = 0, nsectors;
 581         int sense = blk_sense_request(rq);
 582         unsigned int timeout;
 583         u16 len;
 584         u8 ireason, stat;
 585
 586         ide_debug_log(IDE_DBG_PC, "cmd: 0x%x, write: 0x%x", rq->cmd[0], write);
 587
 588         /* check for errors */
 589         dma = drive->dma;
 590         if (dma) {
 591                 drive->dma = 0;
 592                 drive->waiting_for_dma = 0;
 593                 dma_error = hwif->dma_ops->dma_end(drive);
 594                 ide_dma_unmap_sg(drive, cmd);
 595                 if (dma_error) {
 596                         printk(KERN_ERR PFX "%s: DMA %s error\n", drive->name,
 597                                         write ? "write" : "read");
 598                         ide_dma_off(drive);
 599                 }
 600         }
 601
 602         /* check status */
 603         stat = hwif->tp_ops->read_status(hwif);
 604
 605         if (!OK_STAT(stat, 0, BAD_R_STAT)) {
 606                 rc = cdrom_decode_status(drive, stat);
 607                 if (rc) {
 608                         if (rc == 2)
 609                                 goto out_end;
 610                         return ide_stopped;
 611                 }
 612         }
 613
 614         /* using dma, transfer is complete now */
 615         if (dma) {
 616                 if (dma_error)
 617                         return ide_error(drive, "dma error", stat);
 618                 uptodate = 1;
 619                 goto out_end;
 620         }
 621
 622         ide_read_bcount_and_ireason(drive, &len, &ireason);
 623
 624         thislen = blk_fs_request(rq) ? len : cmd->nleft;
 625         if (thislen > len)
 626                 thislen = len;
 627
 628         ide_debug_log(IDE_DBG_PC, "DRQ: stat: 0x%x, thislen: %d",
 629                                   stat, thislen);
 630
 631         /* If DRQ is clear, the command has completed. */
 632         if ((stat & ATA_DRQ) == 0) {
 633                 if (blk_fs_request(rq)) {
 634                         /*
 635                          * If we're not done reading/writing, complain.
 636                          * Otherwise, complete the command normally.
 637                          */
 638                         uptodate = 1;
 639                         if (cmd->nleft > 0) {
 640                                 printk(KERN_ERR PFX "%s: %s: data underrun "
 641                                         "(%u bytes)\n", drive->name, __func__,
 642                                         cmd->nleft);
 643                                 if (!write)
 644                                         rq->cmd_flags |= REQ_FAILED;
 645                                 uptodate = 0;
 646                         }
 647                 } else if (!blk_pc_request(rq)) {
 648                         ide_cd_request_sense_fixup(drive, cmd);
 649                         /* complain if we still have data left to transfer */
 650                         uptodate = cmd->nleft ? 0 : 1;
 651                         if (uptodate == 0)
 652                                 rq->cmd_flags |= REQ_FAILED;
 653                 }
 654                 goto out_end;
 655         }
 656
 657         /* check which way to transfer data */
 658         rc = ide_cd_check_ireason(drive, rq, len, ireason, write);
 659         if (rc)
 660                 goto out_end;
 661
 662         cmd->last_xfer_len = 0;
 663
 664         ide_debug_log(IDE_DBG_PC, "data transfer, rq->cmd_type: 0x%x, "
 665                                   "ireason: 0x%x",
 666                                   rq->cmd_type, ireason);
 667
 668         /* transfer data */
 669         while (thislen > 0) {
 670                 int blen = min_t(int, thislen, cmd->nleft);
 671
 672                 if (cmd->nleft == 0)
 673                         break;
 674
 675                 ide_pio_bytes(drive, cmd, write, blen);
 676                 cmd->last_xfer_len += blen;
 677
 678                 thislen -= blen;
 679                 len -= blen;
 680
 681                 if (sense && write == 0)
 682                         rq->sense_len += blen;
 683         }
 684
 685         /* pad, if necessary */
 686         if (len > 0) {
 687                 if (blk_fs_request(rq) == 0 || write == 0)
 688                         ide_pad_transfer(drive, write, len);
 689                 else {
 690                         printk(KERN_ERR PFX "%s: confused, missing data\n",
 691                                 drive->name);
 692                         blk_dump_rq_flags(rq, "cdrom_newpc_intr");
 693                 }
 694         }
 695
 696         if (blk_pc_request(rq)) {
 697                 timeout = rq->timeout;
 698         } else {
 699                 timeout = ATAPI_WAIT_PC;
 700                 if (!blk_fs_request(rq))
 701                         expiry = ide_cd_expiry;
 702         }
 703
 704         hwif->expiry = expiry;
 705         ide_set_handler(drive, cdrom_newpc_intr, timeout);
 706         return ide_started;
 707
 708 out_end:
 709         if (blk_pc_request(rq) && rc == 0) {
 710                 if (blk_end_request(rq, 0, rq->data_len))
 711                         BUG();
 712
 713                 hwif->rq = NULL;
 714         } else {
 715                 if (sense && uptodate)
 716                         ide_cd_complete_failed_rq(drive, rq);
 717
 718                 if (blk_fs_request(rq)) {
 719                         if (cmd->nleft == 0)
 720                                 uptodate = 1;
 721                 } else {
 722                         if (uptodate <= 0 && rq->errors == 0)
 723                                 rq->errors = -EIO;
 724                 }
 725
 726                 if (uptodate == 0)
 727                         ide_cd_error_cmd(drive, cmd);
 728
 729                 /* make sure it's fully ended */
 730                 if (blk_pc_request(rq))
 731                         nsectors = (rq->data_len + 511) >> 9;
 732                 else
 733                         nsectors = rq->hard_nr_sectors;
 734
 735                 if (nsectors == 0)
 736                         nsectors = 1;
 737
 738                 if (blk_fs_request(rq) == 0) {
 739                         rq->resid_len = rq->data_len -
 740                                 (cmd->nbytes - cmd->nleft);
 741                         if (uptodate == 0 && (cmd->tf_flags & IDE_TFLAG_WRITE))
 742                                 rq->resid_len += cmd->last_xfer_len;
 743                 }
 744
 745                 ide_complete_rq(drive, uptodate ? 0 : -EIO, nsectors << 9);
 746
 747                 if (sense && rc == 2)
 748                         ide_error(drive, "request sense failure", stat);
 749         }
 750         return ide_stopped;
 751 }
 752
 753 static ide_startstop_t cdrom_start_rw(ide_drive_t *drive, struct request *rq)
 754 {
 755         struct cdrom_info *cd = drive->driver_data;
 756         struct request_queue *q = drive->queue;
 757         int write = rq_data_dir(rq) == WRITE;
 758         unsigned short sectors_per_frame =
 759                 queue_hardsect_size(q) >> SECTOR_BITS;
 760
 761         ide_debug_log(IDE_DBG_RQ, "rq->cmd[0]: 0x%x, rq->cmd_flags: 0x%x, "
 762                                   "secs_per_frame: %u",
 763                                   rq->cmd[0], rq->cmd_flags, sectors_per_frame);
 764
 765         if (write) {
 766                 /* disk has become write protected */
 767                 if (get_disk_ro(cd->disk))
 768                         return ide_stopped;
 769         } else {
 770                 /*
 771                  * We may be retrying this request after an error.  Fix up any
 772                  * weirdness which might be present in the request packet.
 773                  */
 774                 q->prep_rq_fn(q, rq);
 775         }
 776
 777         /* fs requests *must* be hardware frame aligned */
 778         if ((rq->nr_sectors & (sectors_per_frame - 1)) ||
 779             (rq->sector & (sectors_per_frame - 1)))
 780                 return ide_stopped;
 781
 782         /* use DMA, if possible */
 783         drive->dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
 784
 785         if (write)
 786                 cd->devinfo.media_written = 1;
 787
 788         rq->timeout = ATAPI_WAIT_PC;
 789
 790         return ide_started;
 791 }
 792
 793 static void cdrom_do_block_pc(ide_drive_t *drive, struct request *rq)
 794 {
 795
 796         ide_debug_log(IDE_DBG_PC, "rq->cmd[0]: 0x%x, rq->cmd_type: 0x%x",
 797                                   rq->cmd[0], rq->cmd_type);
 798
 799         if (blk_pc_request(rq))
 800                 rq->cmd_flags |= REQ_QUIET;
 801         else
 802                 rq->cmd_flags &= ~REQ_FAILED;
 803
 804         drive->dma = 0;
 805
 806         /* sg request */
 807         if (rq->bio) {
 808                 struct request_queue *q = drive->queue;
 809                 char *buf = bio_data(rq->bio);
 810                 unsigned int alignment;
 811
 812                 drive->dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
 813
 814                 /*
 815                  * check if dma is safe
 816                  *
 817                  * NOTE! The "len" and "addr" checks should possibly have
 818                  * separate masks.
 819                  */
 820                 alignment = queue_dma_alignment(q) | q->dma_pad_mask;
 821                 if ((unsigned long)buf & alignment
 822                     || rq->data_len & q->dma_pad_mask
 823                     || object_is_on_stack(buf))
 824                         drive->dma = 0;
 825         }
 826 }
 827
 828 static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
 829                                         sector_t block)
 830 {
 831         struct ide_cmd cmd;
 832         int uptodate = 0, nsectors;
 833
 834         ide_debug_log(IDE_DBG_RQ, "cmd: 0x%x, block: %llu",
 835                                   rq->cmd[0], (unsigned long long)block);
 836
 837         if (drive->debug_mask & IDE_DBG_RQ)
 838                 blk_dump_rq_flags(rq, "ide_cd_do_request");
 839
 840         if (blk_fs_request(rq)) {
 841                 if (cdrom_start_rw(drive, rq) == ide_stopped)
 842                         goto out_end;
 843         } else if (blk_sense_request(rq) || blk_pc_request(rq) ||
 844                    rq->cmd_type == REQ_TYPE_ATA_PC) {
 845                 if (!rq->timeout)
 846                         rq->timeout = ATAPI_WAIT_PC;
 847
 848                 cdrom_do_block_pc(drive, rq);
 849         } else if (blk_special_request(rq)) {
 850                 /* right now this can only be a reset... */
 851                 uptodate = 1;
 852                 goto out_end;
 853         } else {
 854                 blk_dump_rq_flags(rq, DRV_NAME " bad flags");
 855                 if (rq->errors == 0)
 856                         rq->errors = -EIO;
 857                 goto out_end;
 858         }
 859
 860         /* prepare sense request for this command */
 861         ide_prep_sense(drive, rq);
 862
 863         memset(&cmd, 0, sizeof(cmd));
 864
 865         if (rq_data_dir(rq))
 866                 cmd.tf_flags |= IDE_TFLAG_WRITE;
 867
 868         cmd.rq = rq;
 869
 870         if (blk_fs_request(rq) || rq->data_len) {
 871                 ide_init_sg_cmd(&cmd, blk_fs_request(rq) ? (rq->nr_sectors << 9)
 872                                                          : rq->data_len);
 873                 ide_map_sg(drive, &cmd);
 874         }
 875
 876         return ide_issue_pc(drive, &cmd);
 877 out_end:
 878         nsectors = rq->hard_nr_sectors;
 879
 880         if (nsectors == 0)
 881                 nsectors = 1;
 882
 883         ide_complete_rq(drive, uptodate ? 0 : -EIO, nsectors << 9);
 884
 885         return ide_stopped;
 886 }
 887
 888 /*
 889  * Ioctl handling.
 890  *
 891  * Routines which queue packet commands take as a final argument a pointer to a
 892  * request_sense struct. If execution of the command results in an error with a
 893  * CHECK CONDITION status, this structure will be filled with the results of the
 894  * subsequent request sense command. The pointer can also be NULL, in which case
 895  * no sense information is returned.
 896  */
 897 static void msf_from_bcd(struct atapi_msf *msf)
 898 {
 899         msf->minute = bcd2bin(msf->minute);
 900         msf->second = bcd2bin(msf->second);
 901         msf->frame  = bcd2bin(msf->frame);
 902 }
 903
 904 int cdrom_check_status(ide_drive_t *drive, struct request_sense *sense)
 905 {
 906         struct cdrom_info *info = drive->driver_data;
 907         struct cdrom_device_info *cdi = &info->devinfo;
 908         unsigned char cmd[BLK_MAX_CDB];
 909
 910         ide_debug_log(IDE_DBG_FUNC, "enter");
 911
 912         memset(cmd, 0, BLK_MAX_CDB);
 913         cmd[0] = GPCMD_TEST_UNIT_READY;
 914
 915         /*
 916          * Sanyo 3 CD changer uses byte 7 of TEST_UNIT_READY to switch CDs
 917          * instead of supporting the LOAD_UNLOAD opcode.
 918          */
 919         cmd[7] = cdi->sanyo_slot % 3;
 920
 921         return ide_cd_queue_pc(drive, cmd, 0, NULL, NULL, sense, 0, REQ_QUIET);
 922 }
 923
 924 static int cdrom_read_capacity(ide_drive_t *drive, unsigned long *capacity,
 925                                unsigned long *sectors_per_frame,
 926                                struct request_sense *sense)
 927 {
 928         struct {
 929                 __be32 lba;
 930                 __be32 blocklen;
 931         } capbuf;
 932
 933         int stat;
 934         unsigned char cmd[BLK_MAX_CDB];
 935         unsigned len = sizeof(capbuf);
 936         u32 blocklen;
 937
 938         ide_debug_log(IDE_DBG_FUNC, "enter");
 939
 940         memset(cmd, 0, BLK_MAX_CDB);
 941         cmd[0] = GPCMD_READ_CDVD_CAPACITY;
 942
 943         stat = ide_cd_queue_pc(drive, cmd, 0, &capbuf, &len, sense, 0,
 944                                REQ_QUIET);
 945         if (stat)
 946                 return stat;
 947
 948         /*
 949          * Sanity check the given block size
 950          */
 951         blocklen = be32_to_cpu(capbuf.blocklen);
 952         switch (blocklen) {
 953         case 512:
 954         case 1024:
 955         case 2048:
 956         case 4096:
 957                 break;
 958         default:
 959                 printk(KERN_ERR PFX "%s: weird block size %u\n",
 960                                 drive->name, blocklen);
 961                 printk(KERN_ERR PFX "%s: default to 2kb block size\n",
 962                                 drive->name);
 963                 blocklen = 2048;
 964                 break;
 965         }
 966
 967         *capacity = 1 + be32_to_cpu(capbuf.lba);
 968         *sectors_per_frame = blocklen >> SECTOR_BITS;
 969
 970         ide_debug_log(IDE_DBG_PROBE, "cap: %lu, sectors_per_frame: %lu",
 971                                      *capacity, *sectors_per_frame);
 972
 973         return 0;
 974 }
 975
 976 static int cdrom_read_tocentry(ide_drive_t *drive, int trackno, int msf_flag,
 977                                 int format, char *buf, int buflen,
 978                                 struct request_sense *sense)
 979 {
 980         unsigned char cmd[BLK_MAX_CDB];
 981
 982         ide_debug_log(IDE_DBG_FUNC, "enter");
 983
 984         memset(cmd, 0, BLK_MAX_CDB);
 985
 986         cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
 987         cmd[6] = trackno;
 988         cmd[7] = (buflen >> 8);
 989         cmd[8] = (buflen & 0xff);
 990         cmd[9] = (format << 6);
 991
 992         if (msf_flag)
 993                 cmd[1] = 2;
 994
 995         return ide_cd_queue_pc(drive, cmd, 0, buf, &buflen, sense, 0, REQ_QUIET);
 996 }
 997
 998 /* Try to read the entire TOC for the disk into our internal buffer. */
 999 int ide_cd_read_toc(ide_drive_t *drive, struct request_sense *sense)
1000 {
1001         int stat, ntracks, i;
1002         struct cdrom_info *info = drive->driver_data;
1003         struct cdrom_device_info *cdi = &info->devinfo;
1004         struct atapi_toc *toc = info->toc;
1005         struct {
1006                 struct atapi_toc_header hdr;
1007                 struct atapi_toc_entry  ent;
1008         } ms_tmp;
1009         long last_written;
1010         unsigned long sectors_per_frame = SECTORS_PER_FRAME;
1011
1012         ide_debug_log(IDE_DBG_FUNC, "enter");
1013
1014         if (toc == NULL) {
1015                 /* try to allocate space */
1016                 toc = kmalloc(sizeof(struct atapi_toc), GFP_KERNEL);
1017                 if (toc == NULL) {
1018                         printk(KERN_ERR PFX "%s: No cdrom TOC buffer!\n",
1019                                         drive->name);
1020                         return -ENOMEM;
1021                 }
1022                 info->toc = toc;
1023         }
1024
1025         /*
1026          * Check to see if the existing data is still valid. If it is,
1027          * just return.
1028          */
1029         (void) cdrom_check_status(drive, sense);
1030
1031         if (drive->atapi_flags & IDE_AFLAG_TOC_VALID)
1032                 return 0;
1033
1034         /* try to get the total cdrom capacity and sector size */
1035         stat = cdrom_read_capacity(drive, &toc->capacity, &sectors_per_frame,
1036                                    sense);
1037         if (stat)
1038                 toc->capacity = 0x1fffff;
1039
1040         set_capacity(info->disk, toc->capacity * sectors_per_frame);
1041         /* save a private copy of the TOC capacity for error handling */
1042         drive->probed_capacity = toc->capacity * sectors_per_frame;
1043
1044         blk_queue_hardsect_size(drive->queue,
1045                                 sectors_per_frame << SECTOR_BITS);
1046
1047         /* first read just the header, so we know how long the TOC is */
1048         stat = cdrom_read_tocentry(drive, 0, 1, 0, (char *) &toc->hdr,
1049                                     sizeof(struct atapi_toc_header), sense);
1050         if (stat)
1051                 return stat;
1052
1053         if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
1054                 toc->hdr.first_track = bcd2bin(toc->hdr.first_track);
1055                 toc->hdr.last_track  = bcd2bin(toc->hdr.last_track);
1056         }
1057
1058         ntracks = toc->hdr.last_track - toc->hdr.first_track + 1;
1059         if (ntracks <= 0)
1060                 return -EIO;
1061         if (ntracks > MAX_TRACKS)
1062                 ntracks = MAX_TRACKS;
1063
1064         /* now read the whole schmeer */
1065         stat = cdrom_read_tocentry(drive, toc->hdr.first_track, 1, 0,
1066                                   (char *)&toc->hdr,
1067                                    sizeof(struct atapi_toc_header) +
1068                                    (ntracks + 1) *
1069                                    sizeof(struct atapi_toc_entry), sense);
1070
1071         if (stat && toc->hdr.first_track > 1) {
1072                 /*
1073                  * Cds with CDI tracks only don't have any TOC entries, despite
1074                  * of this the returned values are
1075                  * first_track == last_track = number of CDI tracks + 1,
1076                  * so that this case is indistinguishable from the same layout
1077                  * plus an additional audio track. If we get an error for the
1078                  * regular case, we assume a CDI without additional audio
1079                  * tracks. In this case the readable TOC is empty (CDI tracks
1080                  * are not included) and only holds the Leadout entry.
1081                  *
1082                  * Heiko Eißfeldt.
1083                  */
1084                 ntracks = 0;
1085                 stat = cdrom_read_tocentry(drive, CDROM_LEADOUT, 1, 0,
1086                                            (char *)&toc->hdr,
1087                                            sizeof(struct atapi_toc_header) +
1088                                            (ntracks + 1) *
1089                                            sizeof(struct atapi_toc_entry),
1090                                            sense);
1091                 if (stat)
1092                         return stat;
1093
1094                 if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
1095                         toc->hdr.first_track = (u8)bin2bcd(CDROM_LEADOUT);
1096                         toc->hdr.last_track = (u8)bin2bcd(CDROM_LEADOUT);
1097                 } else {
1098                         toc->hdr.first_track = CDROM_LEADOUT;
1099                         toc->hdr.last_track = CDROM_LEADOUT;
1100                 }
1101         }
1102
1103         if (stat)
1104                 return stat;
1105
1106         toc->hdr.toc_length = be16_to_cpu(toc->hdr.toc_length);
1107
1108         if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
1109                 toc->hdr.first_track = bcd2bin(toc->hdr.first_track);
1110                 toc->hdr.last_track  = bcd2bin(toc->hdr.last_track);
1111         }
1112
1113         for (i = 0; i <= ntracks; i++) {
1114                 if (drive->atapi_flags & IDE_AFLAG_TOCADDR_AS_BCD) {
1115                         if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD)
1116                                 toc->ent[i].track = bcd2bin(toc->ent[i].track);
1117                         msf_from_bcd(&toc->ent[i].addr.msf);
1118                 }
1119                 toc->ent[i].addr.lba = msf_to_lba(toc->ent[i].addr.msf.minute,
1120                                                   toc->ent[i].addr.msf.second,
1121                                                   toc->ent[i].addr.msf.frame);
1122         }
1123
1124         if (toc->hdr.first_track != CDROM_LEADOUT) {
1125                 /* read the multisession information */
1126                 stat = cdrom_read_tocentry(drive, 0, 0, 1, (char *)&ms_tmp,
1127                                            sizeof(ms_tmp), sense);
1128                 if (stat)
1129                         return stat;
1130
1131                 toc->last_session_lba = be32_to_cpu(ms_tmp.ent.addr.lba);
1132         } else {
1133                 ms_tmp.hdr.last_track = CDROM_LEADOUT;
1134                 ms_tmp.hdr.first_track = ms_tmp.hdr.last_track;
1135                 toc->last_session_lba = msf_to_lba(0, 2, 0); /* 0m 2s 0f */
1136         }
1137
1138         if (drive->atapi_flags & IDE_AFLAG_TOCADDR_AS_BCD) {
1139                 /* re-read multisession information using MSF format */
1140                 stat = cdrom_read_tocentry(drive, 0, 1, 1, (char *)&ms_tmp,
1141                                            sizeof(ms_tmp), sense);
1142                 if (stat)
1143                         return stat;
1144
1145                 msf_from_bcd(&ms_tmp.ent.addr.msf);
1146                 toc->last_session_lba = msf_to_lba(ms_tmp.ent.addr.msf.minute,
1147                                                    ms_tmp.ent.addr.msf.second,
1148                                                    ms_tmp.ent.addr.msf.frame);
1149         }
1150
1151         toc->xa_flag = (ms_tmp.hdr.first_track != ms_tmp.hdr.last_track);
1152
1153         /* now try to get the total cdrom capacity */
1154         stat = cdrom_get_last_written(cdi, &last_written);
1155         if (!stat && (last_written > toc->capacity)) {
1156                 toc->capacity = last_written;
1157                 set_capacity(info->disk, toc->capacity * sectors_per_frame);
1158                 drive->probed_capacity = toc->capacity * sectors_per_frame;
1159         }
1160
1161         /* Remember that we've read this stuff. */
1162         drive->atapi_flags |= IDE_AFLAG_TOC_VALID;
1163
1164         return 0;
1165 }
1166
1167 int ide_cdrom_get_capabilities(ide_drive_t *drive, u8 *buf)
1168 {
1169         struct cdrom_info *info = drive->driver_data;
1170         struct cdrom_device_info *cdi = &info->devinfo;
1171         struct packet_command cgc;
1172         int stat, attempts = 3, size = ATAPI_CAPABILITIES_PAGE_SIZE;
1173
1174         ide_debug_log(IDE_DBG_FUNC, "enter");
1175
1176         if ((drive->atapi_flags & IDE_AFLAG_FULL_CAPS_PAGE) == 0)
1177                 size -= ATAPI_CAPABILITIES_PAGE_PAD_SIZE;
1178
1179         init_cdrom_command(&cgc, buf, size, CGC_DATA_UNKNOWN);
1180         do {
1181                 /* we seem to get stat=0x01,err=0x00 the first time (??) */
1182                 stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1183                 if (!stat)
1184                         break;
1185         } while (--attempts);
1186         return stat;
1187 }
1188
1189 void ide_cdrom_update_speed(ide_drive_t *drive, u8 *buf)
1190 {
1191         struct cdrom_info *cd = drive->driver_data;
1192         u16 curspeed, maxspeed;
1193
1194         ide_debug_log(IDE_DBG_FUNC, "enter");
1195
1196         if (drive->atapi_flags & IDE_AFLAG_LE_SPEED_FIELDS) {
1197                 curspeed = le16_to_cpup((__le16 *)&buf[8 + 14]);
1198                 maxspeed = le16_to_cpup((__le16 *)&buf[8 + 8]);
1199         } else {
1200                 curspeed = be16_to_cpup((__be16 *)&buf[8 + 14]);
1201                 maxspeed = be16_to_cpup((__be16 *)&buf[8 + 8]);
1202         }
1203
1204         ide_debug_log(IDE_DBG_PROBE, "curspeed: %u, maxspeed: %u",
1205                                      curspeed, maxspeed);
1206
1207         cd->current_speed = (curspeed + (176/2)) / 176;
1208         cd->max_speed = (maxspeed + (176/2)) / 176;
1209 }
1210
1211 #define IDE_CD_CAPABILITIES \
1212         (CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK | CDC_SELECT_SPEED | \
1213          CDC_SELECT_DISC | CDC_MULTI_SESSION | CDC_MCN | CDC_MEDIA_CHANGED | \
1214          CDC_PLAY_AUDIO | CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R | \
1215          CDC_CD_RW | CDC_DVD | CDC_DVD_R | CDC_DVD_RAM | CDC_GENERIC_PACKET | \
1216          CDC_MO_DRIVE | CDC_MRW | CDC_MRW_W | CDC_RAM)
1217
1218 static struct cdrom_device_ops ide_cdrom_dops = {
1219         .open                   = ide_cdrom_open_real,
1220         .release                = ide_cdrom_release_real,
1221         .drive_status           = ide_cdrom_drive_status,
1222         .media_changed          = ide_cdrom_check_media_change_real,
1223         .tray_move              = ide_cdrom_tray_move,
1224         .lock_door              = ide_cdrom_lock_door,
1225         .select_speed           = ide_cdrom_select_speed,
1226         .get_last_session       = ide_cdrom_get_last_session,
1227         .get_mcn                = ide_cdrom_get_mcn,
1228         .reset                  = ide_cdrom_reset,
1229         .audio_ioctl            = ide_cdrom_audio_ioctl,
1230         .capability             = IDE_CD_CAPABILITIES,
1231         .generic_packet         = ide_cdrom_packet,
1232 };
1233
1234 static int ide_cdrom_register(ide_drive_t *drive, int nslots)
1235 {
1236         struct cdrom_info *info = drive->driver_data;
1237         struct cdrom_device_info *devinfo = &info->devinfo;
1238
1239         ide_debug_log(IDE_DBG_PROBE, "nslots: %d", nslots);
1240
1241         devinfo->ops = &ide_cdrom_dops;
1242         devinfo->speed = info->current_speed;
1243         devinfo->capacity = nslots;
1244         devinfo->handle = drive;
1245         strcpy(devinfo->name, drive->name);
1246
1247         if (drive->atapi_flags & IDE_AFLAG_NO_SPEED_SELECT)
1248                 devinfo->mask |= CDC_SELECT_SPEED;
1249
1250         devinfo->disk = info->disk;
1251         return register_cdrom(devinfo);
1252 }
1253
1254 static int ide_cdrom_probe_capabilities(ide_drive_t *drive)
1255 {
1256         struct cdrom_info *cd = drive->driver_data;
1257         struct cdrom_device_info *cdi = &cd->devinfo;
1258         u8 buf[ATAPI_CAPABILITIES_PAGE_SIZE];
1259         mechtype_t mechtype;
1260         int nslots = 1;
1261
1262         ide_debug_log(IDE_DBG_PROBE, "media: 0x%x, atapi_flags: 0x%lx",
1263                                      drive->media, drive->atapi_flags);
1264
1265         cdi->mask = (CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R |
1266                      CDC_DVD_RAM | CDC_SELECT_DISC | CDC_PLAY_AUDIO |
1267                      CDC_MO_DRIVE | CDC_RAM);
1268
1269         if (drive->media == ide_optical) {
1270                 cdi->mask &= ~(CDC_MO_DRIVE | CDC_RAM);
1271                 printk(KERN_ERR PFX "%s: ATAPI magneto-optical drive\n",
1272                                 drive->name);
1273                 return nslots;
1274         }
1275
1276         if (drive->atapi_flags & IDE_AFLAG_PRE_ATAPI12) {
1277                 drive->atapi_flags &= ~IDE_AFLAG_NO_EJECT;
1278                 cdi->mask &= ~CDC_PLAY_AUDIO;
1279                 return nslots;
1280         }
1281
1282         /*
1283          * We have to cheat a little here. the packet will eventually be queued
1284          * with ide_cdrom_packet(), which extracts the drive from cdi->handle.
1285          * Since this device hasn't been registered with the Uniform layer yet,
1286          * it can't do this. Same goes for cdi->ops.
1287          */
1288         cdi->handle = drive;
1289         cdi->ops = &ide_cdrom_dops;
1290
1291         if (ide_cdrom_get_capabilities(drive, buf))
1292                 return 0;
1293
1294         if ((buf[8 + 6] & 0x01) == 0)
1295                 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
1296         if (buf[8 + 6] & 0x08)
1297                 drive->atapi_flags &= ~IDE_AFLAG_NO_EJECT;
1298         if (buf[8 + 3] & 0x01)
1299                 cdi->mask &= ~CDC_CD_R;
1300         if (buf[8 + 3] & 0x02)
1301                 cdi->mask &= ~(CDC_CD_RW | CDC_RAM);
1302         if (buf[8 + 2] & 0x38)
1303                 cdi->mask &= ~CDC_DVD;
1304         if (buf[8 + 3] & 0x20)
1305                 cdi->mask &= ~(CDC_DVD_RAM | CDC_RAM);
1306         if (buf[8 + 3] & 0x10)
1307                 cdi->mask &= ~CDC_DVD_R;
1308         if ((buf[8 + 4] & 0x01) || (drive->atapi_flags & IDE_AFLAG_PLAY_AUDIO_OK))
1309                 cdi->mask &= ~CDC_PLAY_AUDIO;
1310
1311         mechtype = buf[8 + 6] >> 5;
1312         if (mechtype == mechtype_caddy ||
1313             mechtype == mechtype_popup ||
1314             (drive->atapi_flags & IDE_AFLAG_NO_AUTOCLOSE))
1315                 cdi->mask |= CDC_CLOSE_TRAY;
1316
1317         if (cdi->sanyo_slot > 0) {
1318                 cdi->mask &= ~CDC_SELECT_DISC;
1319                 nslots = 3;
1320         } else if (mechtype == mechtype_individual_changer ||
1321                    mechtype == mechtype_cartridge_changer) {
1322                 nslots = cdrom_number_of_slots(cdi);
1323                 if (nslots > 1)
1324                         cdi->mask &= ~CDC_SELECT_DISC;
1325         }
1326
1327         ide_cdrom_update_speed(drive, buf);
1328
1329         printk(KERN_INFO PFX "%s: ATAPI", drive->name);
1330
1331         /* don't print speed if the drive reported 0 */
1332         if (cd->max_speed)
1333                 printk(KERN_CONT " %dX", cd->max_speed);
1334
1335         printk(KERN_CONT " %s", (cdi->mask & CDC_DVD) ? "CD-ROM" : "DVD-ROM");
1336
1337         if ((cdi->mask & CDC_DVD_R) == 0 || (cdi->mask & CDC_DVD_RAM) == 0)
1338                 printk(KERN_CONT " DVD%s%s",
1339                                  (cdi->mask & CDC_DVD_R) ? "" : "-R",
1340                                  (cdi->mask & CDC_DVD_RAM) ? "" : "/RAM");
1341
1342         if ((cdi->mask & CDC_CD_R) == 0 || (cdi->mask & CDC_CD_RW) == 0)
1343                 printk(KERN_CONT " CD%s%s",
1344                                  (cdi->mask & CDC_CD_R) ? "" : "-R",
1345                                  (cdi->mask & CDC_CD_RW) ? "" : "/RW");
1346
1347         if ((cdi->mask & CDC_SELECT_DISC) == 0)
1348                 printk(KERN_CONT " changer w/%d slots", nslots);
1349         else
1350                 printk(KERN_CONT " drive");
1351
1352         printk(KERN_CONT ", %dkB Cache\n",
1353                          be16_to_cpup((__be16 *)&buf[8 + 12]));
1354
1355         return nslots;
1356 }
1357
1358 /* standard prep_rq_fn that builds 10 byte cmds */
1359 static int ide_cdrom_prep_fs(struct request_queue *q, struct request *rq)
1360 {
1361         int hard_sect = queue_hardsect_size(q);
1362         long block = (long)rq->hard_sector / (hard_sect >> 9);
1363         unsigned long blocks = rq->hard_nr_sectors / (hard_sect >> 9);
1364
1365         memset(rq->cmd, 0, BLK_MAX_CDB);
1366
1367         if (rq_data_dir(rq) == READ)
1368                 rq->cmd[0] = GPCMD_READ_10;
1369         else
1370                 rq->cmd[0] = GPCMD_WRITE_10;
1371
1372         /*
1373          * fill in lba
1374          */
1375         rq->cmd[2] = (block >> 24) & 0xff;
1376         rq->cmd[3] = (block >> 16) & 0xff;
1377         rq->cmd[4] = (block >>  8) & 0xff;
1378         rq->cmd[5] = block & 0xff;
1379
1380         /*
1381          * and transfer length
1382          */
1383         rq->cmd[7] = (blocks >> 8) & 0xff;
1384         rq->cmd[8] = blocks & 0xff;
1385         rq->cmd_len = 10;
1386         return BLKPREP_OK;
1387 }
1388
1389 /*
1390  * Most of the SCSI commands are supported directly by ATAPI devices.
1391  * This transform handles the few exceptions.
1392  */
1393 static int ide_cdrom_prep_pc(struct request *rq)
1394 {
1395         u8 *c = rq->cmd;
1396
1397         /* transform 6-byte read/write commands to the 10-byte version */
1398         if (c[0] == READ_6 || c[0] == WRITE_6) {
1399                 c[8] = c[4];
1400                 c[5] = c[3];
1401                 c[4] = c[2];
1402                 c[3] = c[1] & 0x1f;
1403                 c[2] = 0;
1404                 c[1] &= 0xe0;
1405                 c[0] += (READ_10 - READ_6);
1406                 rq->cmd_len = 10;
1407                 return BLKPREP_OK;
1408         }
1409
1410         /*
1411          * it's silly to pretend we understand 6-byte sense commands, just
1412          * reject with ILLEGAL_REQUEST and the caller should take the
1413          * appropriate action
1414          */
1415         if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
1416                 rq->errors = ILLEGAL_REQUEST;
1417                 return BLKPREP_KILL;
1418         }
1419
1420         return BLKPREP_OK;
1421 }
1422
1423 static int ide_cdrom_prep_fn(struct request_queue *q, struct request *rq)
1424 {
1425         if (blk_fs_request(rq))
1426                 return ide_cdrom_prep_fs(q, rq);
1427         else if (blk_pc_request(rq))
1428                 return ide_cdrom_prep_pc(rq);
1429
1430         return 0;
1431 }
1432
1433 struct cd_list_entry {
1434         const char      *id_model;
1435         const char      *id_firmware;
1436         unsigned int    cd_flags;
1437 };
1438
1439 #ifdef CONFIG_IDE_PROC_FS
1440 static sector_t ide_cdrom_capacity(ide_drive_t *drive)
1441 {
1442         unsigned long capacity, sectors_per_frame;
1443
1444         if (cdrom_read_capacity(drive, &capacity, &sectors_per_frame, NULL))
1445                 return 0;
1446
1447         return capacity * sectors_per_frame;
1448 }
1449
1450 static int proc_idecd_read_capacity(char *page, char **start, off_t off,
1451                                         int count, int *eof, void *data)
1452 {
1453         ide_drive_t *drive = data;
1454         int len;
1455
1456         len = sprintf(page, "%llu\n", (long long)ide_cdrom_capacity(drive));
1457         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
1458 }
1459
1460 static ide_proc_entry_t idecd_proc[] = {
1461         { "capacity", S_IFREG|S_IRUGO, proc_idecd_read_capacity, NULL },
1462         { NULL, 0, NULL, NULL }
1463 };
1464
1465 static ide_proc_entry_t *ide_cd_proc_entries(ide_drive_t *drive)
1466 {
1467         return idecd_proc;
1468 }
1469
1470 static const struct ide_proc_devset *ide_cd_proc_devsets(ide_drive_t *drive)
1471 {
1472         return NULL;
1473 }
1474 #endif
1475
1476 static const struct cd_list_entry ide_cd_quirks_list[] = {
1477         /* SCR-3231 doesn't support the SET_CD_SPEED command. */
1478         { "SAMSUNG CD-ROM SCR-3231", NULL,   IDE_AFLAG_NO_SPEED_SELECT       },
1479         /* Old NEC260 (not R) was released before ATAPI 1.2 spec. */
1480         { "NEC CD-ROM DRIVE:260",    "1.01", IDE_AFLAG_TOCADDR_AS_BCD |
1481                                              IDE_AFLAG_PRE_ATAPI12,          },
1482         /* Vertos 300, some versions of this drive like to talk BCD. */
1483         { "V003S0DS",                NULL,   IDE_AFLAG_VERTOS_300_SSD,       },
1484         /* Vertos 600 ESD. */
1485         { "V006E0DS",                NULL,   IDE_AFLAG_VERTOS_600_ESD,       },
1486         /*
1487          * Sanyo 3 CD changer uses a non-standard command for CD changing
1488          * (by default standard ATAPI support for CD changers is used).
1489          */
1490         { "CD-ROM CDR-C3 G",         NULL,   IDE_AFLAG_SANYO_3CD             },
1491         { "CD-ROM CDR-C3G",          NULL,   IDE_AFLAG_SANYO_3CD             },
1492         { "CD-ROM CDR_C36",          NULL,   IDE_AFLAG_SANYO_3CD             },
1493         /* Stingray 8X CD-ROM. */
1494         { "STINGRAY 8422 IDE 8X CD-ROM 7-27-95", NULL, IDE_AFLAG_PRE_ATAPI12 },
1495         /*
1496          * ACER 50X CD-ROM and WPI 32X CD-ROM require the full spec length
1497          * mode sense page capabilities size, but older drives break.
1498          */
1499         { "ATAPI CD ROM DRIVE 50X MAX", NULL,   IDE_AFLAG_FULL_CAPS_PAGE     },
1500         { "WPI CDS-32X",                NULL,   IDE_AFLAG_FULL_CAPS_PAGE     },
1501         /* ACER/AOpen 24X CD-ROM has the speed fields byte-swapped. */
1502         { "",                        "241N", IDE_AFLAG_LE_SPEED_FIELDS       },
1503         /*
1504          * Some drives used by Apple don't advertise audio play
1505          * but they do support reading TOC & audio datas.
1506          */
1507         { "MATSHITADVD-ROM SR-8187", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1508         { "MATSHITADVD-ROM SR-8186", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1509         { "MATSHITADVD-ROM SR-8176", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1510         { "MATSHITADVD-ROM SR-8174", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1511         { "Optiarc DVD RW AD-5200A", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1512         { "Optiarc DVD RW AD-7200A", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1513         { "Optiarc DVD RW AD-7543A", NULL,   IDE_AFLAG_NO_AUTOCLOSE          },
1514         { "TEAC CD-ROM CD-224E",     NULL,   IDE_AFLAG_NO_AUTOCLOSE          },
1515         { NULL, NULL, 0 }
1516 };
1517
1518 static unsigned int ide_cd_flags(u16 *id)
1519 {
1520         const struct cd_list_entry *cle = ide_cd_quirks_list;
1521
1522         while (cle->id_model) {
1523                 if (strcmp(cle->id_model, (char *)&id[ATA_ID_PROD]) == 0 &&
1524                     (cle->id_firmware == NULL ||
1525                      strstr((char *)&id[ATA_ID_FW_REV], cle->id_firmware)))
1526                         return cle->cd_flags;
1527                 cle++;
1528         }
1529
1530         return 0;
1531 }
1532
1533 static int ide_cdrom_setup(ide_drive_t *drive)
1534 {
1535         struct cdrom_info *cd = drive->driver_data;
1536         struct cdrom_device_info *cdi = &cd->devinfo;
1537         struct request_queue *q = drive->queue;
1538         u16 *id = drive->id;
1539         char *fw_rev = (char *)&id[ATA_ID_FW_REV];
1540         int nslots;
1541
1542         ide_debug_log(IDE_DBG_PROBE, "enter");
1543
1544         blk_queue_prep_rq(q, ide_cdrom_prep_fn);
1545         blk_queue_dma_alignment(q, 31);
1546         blk_queue_update_dma_pad(q, 15);
1547
1548         q->unplug_delay = max((1 * HZ) / 1000, 1);
1549
1550         drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;
1551         drive->atapi_flags = IDE_AFLAG_NO_EJECT | ide_cd_flags(id);
1552
1553         if ((drive->atapi_flags & IDE_AFLAG_VERTOS_300_SSD) &&
1554             fw_rev[4] == '1' && fw_rev[6] <= '2')
1555                 drive->atapi_flags |= (IDE_AFLAG_TOCTRACKS_AS_BCD |
1556                                      IDE_AFLAG_TOCADDR_AS_BCD);
1557         else if ((drive->atapi_flags & IDE_AFLAG_VERTOS_600_ESD) &&
1558                  fw_rev[4] == '1' && fw_rev[6] <= '2')
1559                 drive->atapi_flags |= IDE_AFLAG_TOCTRACKS_AS_BCD;
1560         else if (drive->atapi_flags & IDE_AFLAG_SANYO_3CD)
1561                 /* 3 => use CD in slot 0 */
1562                 cdi->sanyo_slot = 3;
1563
1564         nslots = ide_cdrom_probe_capabilities(drive);
1565
1566         blk_queue_hardsect_size(q, CD_FRAMESIZE);
1567
1568         if (ide_cdrom_register(drive, nslots)) {
1569                 printk(KERN_ERR PFX "%s: %s failed to register device with the"
1570                                 " cdrom driver.\n", drive->name, __func__);
1571                 cd->devinfo.handle = NULL;
1572                 return 1;
1573         }
1574
1575         ide_proc_register_driver(drive, cd->driver);
1576         return 0;
1577 }
1578
1579 static void ide_cd_remove(ide_drive_t *drive)
1580 {
1581         struct cdrom_info *info = drive->driver_data;
1582
1583         ide_debug_log(IDE_DBG_FUNC, "enter");
1584
1585         ide_proc_unregister_driver(drive, info->driver);
1586         device_del(&info->dev);
1587         del_gendisk(info->disk);
1588
1589         mutex_lock(&idecd_ref_mutex);
1590         put_device(&info->dev);
1591         mutex_unlock(&idecd_ref_mutex);
1592 }
1593
1594 static void ide_cd_release(struct device *dev)
1595 {
1596         struct cdrom_info *info = to_ide_drv(dev, cdrom_info);
1597         struct cdrom_device_info *devinfo = &info->devinfo;
1598         ide_drive_t *drive = info->drive;
1599         struct gendisk *g = info->disk;
1600
1601         ide_debug_log(IDE_DBG_FUNC, "enter");
1602
1603         kfree(info->toc);
1604         if (devinfo->handle == drive)
1605                 unregister_cdrom(devinfo);
1606         drive->driver_data = NULL;
1607         blk_queue_prep_rq(drive->queue, NULL);
1608         g->private_data = NULL;
1609         put_disk(g);
1610         kfree(info);
1611 }
1612
1613 static int ide_cd_probe(ide_drive_t *);
1614
1615 static struct ide_driver ide_cdrom_driver = {
1616         .gen_driver = {
1617                 .owner          = THIS_MODULE,
1618                 .name           = "ide-cdrom",
1619                 .bus            = &ide_bus_type,
1620         },
1621         .probe                  = ide_cd_probe,
1622         .remove                 = ide_cd_remove,
1623         .version                = IDECD_VERSION,
1624         .do_request             = ide_cd_do_request,
1625 #ifdef CONFIG_IDE_PROC_FS
1626         .proc_entries           = ide_cd_proc_entries,
1627         .proc_devsets           = ide_cd_proc_devsets,
1628 #endif
1629 };
1630
1631 static int idecd_open(struct block_device *bdev, fmode_t mode)
1632 {
1633         struct cdrom_info *info = ide_cd_get(bdev->bd_disk);
1634         int rc = -ENOMEM;
1635
1636         if (!info)
1637                 return -ENXIO;
1638
1639         rc = cdrom_open(&info->devinfo, bdev, mode);
1640
1641         if (rc < 0)
1642                 ide_cd_put(info);
1643
1644         return rc;
1645 }
1646
1647 static int idecd_release(struct gendisk *disk, fmode_t mode)
1648 {
1649         struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
1650
1651         cdrom_release(&info->devinfo, mode);
1652
1653         ide_cd_put(info);
1654
1655         return 0;
1656 }
1657
1658 static int idecd_set_spindown(struct cdrom_device_info *cdi, unsigned long arg)
1659 {
1660         struct packet_command cgc;
1661         char buffer[16];
1662         int stat;
1663         char spindown;
1664
1665         if (copy_from_user(&spindown, (void __user *)arg, sizeof(char)))
1666                 return -EFAULT;
1667
1668         init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_UNKNOWN);
1669
1670         stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CDROM_PAGE, 0);
1671         if (stat)
1672                 return stat;
1673
1674         buffer[11] = (buffer[11] & 0xf0) | (spindown & 0x0f);
1675         return cdrom_mode_select(cdi, &cgc);
1676 }
1677
1678 static int idecd_get_spindown(struct cdrom_device_info *cdi, unsigned long arg)
1679 {
1680         struct packet_command cgc;
1681         char buffer[16];
1682         int stat;
1683         char spindown;
1684
1685         init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_UNKNOWN);
1686
1687         stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CDROM_PAGE, 0);
1688         if (stat)
1689                 return stat;
1690
1691         spindown = buffer[11] & 0x0f;
1692         if (copy_to_user((void __user *)arg, &spindown, sizeof(char)))
1693                 return -EFAULT;
1694         return 0;
1695 }
1696
1697 static int idecd_ioctl(struct block_device *bdev, fmode_t mode,
1698                         unsigned int cmd, unsigned long arg)
1699 {
1700         struct cdrom_info *info = ide_drv_g(bdev->bd_disk, cdrom_info);
1701         int err;
1702
1703         switch (cmd) {
1704         case CDROMSETSPINDOWN:
1705                 return idecd_set_spindown(&info->devinfo, arg);
1706         case CDROMGETSPINDOWN:
1707                 return idecd_get_spindown(&info->devinfo, arg);
1708         default:
1709                 break;
1710         }
1711
1712         err = generic_ide_ioctl(info->drive, bdev, cmd, arg);
1713         if (err == -EINVAL)
1714                 err = cdrom_ioctl(&info->devinfo, bdev, mode, cmd, arg);
1715
1716         return err;
1717 }
1718
1719 static int idecd_media_changed(struct gendisk *disk)
1720 {
1721         struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
1722         return cdrom_media_changed(&info->devinfo);
1723 }
1724
1725 static int idecd_revalidate_disk(struct gendisk *disk)
1726 {
1727         struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
1728         struct request_sense sense;
1729
1730         ide_cd_read_toc(info->drive, &sense);
1731
1732         return  0;
1733 }
1734
1735 static struct block_device_operations idecd_ops = {
1736         .owner                  = THIS_MODULE,
1737         .open                   = idecd_open,
1738         .release                = idecd_release,
1739         .locked_ioctl           = idecd_ioctl,
1740         .media_changed          = idecd_media_changed,
1741         .revalidate_disk        = idecd_revalidate_disk
1742 };
1743
1744 /* module options */
1745 static unsigned long debug_mask;
1746 module_param(debug_mask, ulong, 0644);
1747
1748 MODULE_DESCRIPTION("ATAPI CD-ROM Driver");
1749
1750 static int ide_cd_probe(ide_drive_t *drive)
1751 {
1752         struct cdrom_info *info;
1753         struct gendisk *g;
1754         struct request_sense sense;
1755
1756         ide_debug_log(IDE_DBG_PROBE, "driver_req: %s, media: 0x%x",
1757                                      drive->driver_req, drive->media);
1758
1759         if (!strstr("ide-cdrom", drive->driver_req))
1760                 goto failed;
1761
1762         if (drive->media != ide_cdrom && drive->media != ide_optical)
1763                 goto failed;
1764
1765         drive->debug_mask = debug_mask;
1766         drive->irq_handler = cdrom_newpc_intr;
1767
1768         info = kzalloc(sizeof(struct cdrom_info), GFP_KERNEL);
1769         if (info == NULL) {
1770                 printk(KERN_ERR PFX "%s: Can't allocate a cdrom structure\n",
1771                                 drive->name);
1772                 goto failed;
1773         }
1774
1775         g = alloc_disk(1 << PARTN_BITS);
1776         if (!g)
1777                 goto out_free_cd;
1778
1779         ide_init_disk(g, drive);
1780
1781         info->dev.parent = &drive->gendev;
1782         info->dev.release = ide_cd_release;
1783         dev_set_name(&info->dev, dev_name(&drive->gendev));
1784
1785         if (device_register(&info->dev))
1786                 goto out_free_disk;
1787
1788         info->drive = drive;
1789         info->driver = &ide_cdrom_driver;
1790         info->disk = g;
1791
1792         g->private_data = &info->driver;
1793
1794         drive->driver_data = info;
1795
1796         g->minors = 1;
1797         g->driverfs_dev = &drive->gendev;
1798         g->flags = GENHD_FL_CD | GENHD_FL_REMOVABLE;
1799         if (ide_cdrom_setup(drive)) {
1800                 put_device(&info->dev);
1801                 goto failed;
1802         }
1803
1804         ide_cd_read_toc(drive, &sense);
1805         g->fops = &idecd_ops;
1806         g->flags |= GENHD_FL_REMOVABLE;
1807         add_disk(g);
1808         return 0;
1809
1810 out_free_disk:
1811         put_disk(g);
1812 out_free_cd:
1813         kfree(info);
1814 failed:
1815         return -ENODEV;
1816 }
1817
1818 static void __exit ide_cdrom_exit(void)
1819 {
1820         driver_unregister(&ide_cdrom_driver.gen_driver);
1821 }
1822
1823 static int __init ide_cdrom_init(void)
1824 {
1825         printk(KERN_INFO DRV_NAME " driver " IDECD_VERSION "\n");
1826         return driver_register(&ide_cdrom_driver.gen_driver);
1827 }
1828
1829 MODULE_ALIAS("ide:*m-cdrom*");
1830 MODULE_ALIAS("ide-cd");
1831 module_init(ide_cdrom_init);
1832 module_exit(ide_cdrom_exit);
1833 MODULE_LICENSE("GPL");