linux/drivers/ide/ide-cd.c
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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  Bartlomiej Zolnierkiewicz
   8 *
   9 * May be copied or modified under the terms of the GNU General Public
  10 * License.  See linux/COPYING for more information.
  11 *
  12 * See Documentation/cdrom/ide-cd for usage information.
  13 *
  14 * Suggestions are welcome. Patches that work are more welcome though. ;-)
  15 * For those wishing to work on this driver, please be sure you download
  16 * and comply with the latest Mt. Fuji (SFF8090 version 4) and ATAPI
  17 * (SFF-8020i rev 2.6) standards. These documents can be obtained by
  18 * anonymous ftp from:
  19 * ftp://fission.dt.wdc.com/pub/standards/SFF_atapi/spec/SFF8020-r2.6/PS/8020r26.ps
  20 * ftp://ftp.avc-pioneer.com/Mtfuji4/Spec/Fuji4r10.pdf
  21 *
  22 * For historical changelog please see:
  23 *      Documentation/ide/ChangeLog.ide-cd.1994-2004
  24 */
  25
  26#define DRV_NAME "ide-cd"
  27#define PFX DRV_NAME ": "
  28
  29#define IDECD_VERSION "5.00"
  30
  31#include <linux/module.h>
  32#include <linux/types.h>
  33#include <linux/kernel.h>
  34#include <linux/delay.h>
  35#include <linux/timer.h>
  36#include <linux/slab.h>
  37#include <linux/interrupt.h>
  38#include <linux/errno.h>
  39#include <linux/cdrom.h>
  40#include <linux/ide.h>
  41#include <linux/completion.h>
  42#include <linux/mutex.h>
  43#include <linux/bcd.h>
  44
  45/* For SCSI -> ATAPI command conversion */
  46#include <scsi/scsi.h>
  47
  48#include <linux/irq.h>
  49#include <linux/io.h>
  50#include <asm/byteorder.h>
  51#include <linux/uaccess.h>
  52#include <asm/unaligned.h>
  53
  54#include "ide-cd.h"
  55
  56#define IDECD_DEBUG_LOG         1
  57
  58#if IDECD_DEBUG_LOG
  59#define ide_debug_log(lvl, fmt, args...) __ide_debug_log(lvl, fmt, args)
  60#else
  61#define ide_debug_log(lvl, fmt, args...) do {} while (0)
  62#endif
  63
  64static DEFINE_MUTEX(idecd_ref_mutex);
  65
  66static void ide_cd_release(struct kref *);
  67
  68static struct cdrom_info *ide_cd_get(struct gendisk *disk)
  69{
  70        struct cdrom_info *cd = NULL;
  71
  72        mutex_lock(&idecd_ref_mutex);
  73        cd = ide_drv_g(disk, cdrom_info);
  74        if (cd) {
  75                if (ide_device_get(cd->drive))
  76                        cd = NULL;
  77                else
  78                        kref_get(&cd->kref);
  79
  80        }
  81        mutex_unlock(&idecd_ref_mutex);
  82        return cd;
  83}
  84
  85static void ide_cd_put(struct cdrom_info *cd)
  86{
  87        ide_drive_t *drive = cd->drive;
  88
  89        mutex_lock(&idecd_ref_mutex);
  90        kref_put(&cd->kref, ide_cd_release);
  91        ide_device_put(drive);
  92        mutex_unlock(&idecd_ref_mutex);
  93}
  94
  95/*
  96 * Generic packet command support and error handling routines.
  97 */
  98
  99/* Mark that we've seen a media change and invalidate our internal buffers. */
 100static void cdrom_saw_media_change(ide_drive_t *drive)
 101{
 102        drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;
 103        drive->atapi_flags &= ~IDE_AFLAG_TOC_VALID;
 104}
 105
 106static int cdrom_log_sense(ide_drive_t *drive, struct request *rq,
 107                           struct request_sense *sense)
 108{
 109        int log = 0;
 110
 111        ide_debug_log(IDE_DBG_SENSE, "Call %s, sense_key: 0x%x\n", __func__,
 112                      sense->sense_key);
 113
 114        if (!sense || !rq || (rq->cmd_flags & REQ_QUIET))
 115                return 0;
 116
 117        switch (sense->sense_key) {
 118        case NO_SENSE:
 119        case RECOVERED_ERROR:
 120                break;
 121        case NOT_READY:
 122                /*
 123                 * don't care about tray state messages for e.g. capacity
 124                 * commands or in-progress or becoming ready
 125                 */
 126                if (sense->asc == 0x3a || sense->asc == 0x04)
 127                        break;
 128                log = 1;
 129                break;
 130        case ILLEGAL_REQUEST:
 131                /*
 132                 * don't log START_STOP unit with LoEj set, since we cannot
 133                 * reliably check if drive can auto-close
 134                 */
 135                if (rq->cmd[0] == GPCMD_START_STOP_UNIT && sense->asc == 0x24)
 136                        break;
 137                log = 1;
 138                break;
 139        case UNIT_ATTENTION:
 140                /*
 141                 * Make good and sure we've seen this potential media change.
 142                 * Some drives (i.e. Creative) fail to present the correct sense
 143                 * key in the error register.
 144                 */
 145                cdrom_saw_media_change(drive);
 146                break;
 147        default:
 148                log = 1;
 149                break;
 150        }
 151        return log;
 152}
 153
 154static void cdrom_analyze_sense_data(ide_drive_t *drive,
 155                              struct request *failed_command,
 156                              struct request_sense *sense)
 157{
 158        unsigned long sector;
 159        unsigned long bio_sectors;
 160        struct cdrom_info *info = drive->driver_data;
 161
 162        ide_debug_log(IDE_DBG_SENSE, "Call %s, error_code: 0x%x, "
 163                        "sense_key: 0x%x\n", __func__, sense->error_code,
 164                        sense->sense_key);
 165
 166        if (failed_command)
 167                ide_debug_log(IDE_DBG_SENSE, "%s: failed cmd: 0x%x\n",
 168                                __func__, failed_command->cmd[0]);
 169
 170        if (!cdrom_log_sense(drive, failed_command, sense))
 171                return;
 172
 173        /*
 174         * If a read toc is executed for a CD-R or CD-RW medium where the first
 175         * toc has not been recorded yet, it will fail with 05/24/00 (which is a
 176         * confusing error)
 177         */
 178        if (failed_command && failed_command->cmd[0] == GPCMD_READ_TOC_PMA_ATIP)
 179                if (sense->sense_key == 0x05 && sense->asc == 0x24)
 180                        return;
 181
 182        /* current error */
 183        if (sense->error_code == 0x70) {
 184                switch (sense->sense_key) {
 185                case MEDIUM_ERROR:
 186                case VOLUME_OVERFLOW:
 187                case ILLEGAL_REQUEST:
 188                        if (!sense->valid)
 189                                break;
 190                        if (failed_command == NULL ||
 191                                        !blk_fs_request(failed_command))
 192                                break;
 193                        sector = (sense->information[0] << 24) |
 194                                 (sense->information[1] << 16) |
 195                                 (sense->information[2] <<  8) |
 196                                 (sense->information[3]);
 197
 198                        if (drive->queue->hardsect_size == 2048)
 199                                /* device sector size is 2K */
 200                                sector <<= 2;
 201
 202                        bio_sectors = max(bio_sectors(failed_command->bio), 4U);
 203                        sector &= ~(bio_sectors - 1);
 204
 205                        if (sector < get_capacity(info->disk) &&
 206                            drive->probed_capacity - sector < 4 * 75)
 207                                set_capacity(info->disk, sector);
 208                }
 209        }
 210
 211        ide_cd_log_error(drive->name, failed_command, sense);
 212}
 213
 214static void cdrom_queue_request_sense(ide_drive_t *drive, void *sense,
 215                                      struct request *failed_command)
 216{
 217        struct cdrom_info *info         = drive->driver_data;
 218        struct request *rq              = &info->request_sense_request;
 219
 220        ide_debug_log(IDE_DBG_SENSE, "Call %s\n", __func__);
 221
 222        if (sense == NULL)
 223                sense = &info->sense_data;
 224
 225        /* stuff the sense request in front of our current request */
 226        blk_rq_init(NULL, rq);
 227        rq->cmd_type = REQ_TYPE_ATA_PC;
 228        rq->rq_disk = info->disk;
 229
 230        rq->data = sense;
 231        rq->cmd[0] = GPCMD_REQUEST_SENSE;
 232        rq->cmd[4] = 18;
 233        rq->data_len = 18;
 234
 235        rq->cmd_type = REQ_TYPE_SENSE;
 236        rq->cmd_flags |= REQ_PREEMPT;
 237
 238        /* NOTE! Save the failed command in "rq->buffer" */
 239        rq->buffer = (void *) failed_command;
 240
 241        if (failed_command)
 242                ide_debug_log(IDE_DBG_SENSE, "failed_cmd: 0x%x\n",
 243                              failed_command->cmd[0]);
 244
 245        ide_do_drive_cmd(drive, rq);
 246}
 247
 248static void cdrom_end_request(ide_drive_t *drive, int uptodate)
 249{
 250        struct request *rq = HWGROUP(drive)->rq;
 251        int nsectors = rq->hard_cur_sectors;
 252
 253        ide_debug_log(IDE_DBG_FUNC, "Call %s, cmd: 0x%x, uptodate: 0x%x, "
 254                      "nsectors: %d\n", __func__, rq->cmd[0], uptodate,
 255                      nsectors);
 256
 257        if (blk_sense_request(rq) && uptodate) {
 258                /*
 259                 * For REQ_TYPE_SENSE, "rq->buffer" points to the original
 260                 * failed request
 261                 */
 262                struct request *failed = (struct request *) rq->buffer;
 263                struct cdrom_info *info = drive->driver_data;
 264                void *sense = &info->sense_data;
 265                unsigned long flags;
 266
 267                if (failed) {
 268                        if (failed->sense) {
 269                                sense = failed->sense;
 270                                failed->sense_len = rq->sense_len;
 271                        }
 272                        cdrom_analyze_sense_data(drive, failed, sense);
 273                        /*
 274                         * now end the failed request
 275                         */
 276                        if (blk_fs_request(failed)) {
 277                                if (ide_end_dequeued_request(drive, failed, 0,
 278                                                failed->hard_nr_sectors))
 279                                        BUG();
 280                        } else {
 281                                spin_lock_irqsave(&ide_lock, flags);
 282                                if (__blk_end_request(failed, -EIO,
 283                                                      failed->data_len))
 284                                        BUG();
 285                                spin_unlock_irqrestore(&ide_lock, flags);
 286                        }
 287                } else
 288                        cdrom_analyze_sense_data(drive, NULL, sense);
 289        }
 290
 291        if (!rq->current_nr_sectors && blk_fs_request(rq))
 292                uptodate = 1;
 293        /* make sure it's fully ended */
 294        if (blk_pc_request(rq))
 295                nsectors = (rq->data_len + 511) >> 9;
 296        if (!nsectors)
 297                nsectors = 1;
 298
 299        ide_debug_log(IDE_DBG_FUNC, "Exit %s, uptodate: 0x%x, nsectors: %d\n",
 300                      __func__, uptodate, nsectors);
 301
 302        ide_end_request(drive, uptodate, nsectors);
 303}
 304
 305static void ide_dump_status_no_sense(ide_drive_t *drive, const char *msg, u8 st)
 306{
 307        if (st & 0x80)
 308                return;
 309        ide_dump_status(drive, msg, st);
 310}
 311
 312/*
 313 * Returns:
 314 * 0: if the request should be continued.
 315 * 1: if the request was ended.
 316 */
 317static int cdrom_decode_status(ide_drive_t *drive, int good_stat, int *stat_ret)
 318{
 319        ide_hwif_t *hwif = drive->hwif;
 320        struct request *rq = hwif->hwgroup->rq;
 321        int stat, err, sense_key;
 322
 323        /* check for errors */
 324        stat = hwif->tp_ops->read_status(hwif);
 325
 326        if (stat_ret)
 327                *stat_ret = stat;
 328
 329        if (OK_STAT(stat, good_stat, BAD_R_STAT))
 330                return 0;
 331
 332        /* get the IDE error register */
 333        err = ide_read_error(drive);
 334        sense_key = err >> 4;
 335
 336        if (rq == NULL) {
 337                printk(KERN_ERR PFX "%s: missing rq in %s\n",
 338                                drive->name, __func__);
 339                return 1;
 340        }
 341
 342        ide_debug_log(IDE_DBG_RQ, "%s: stat: 0x%x, good_stat: 0x%x, "
 343                      "rq->cmd[0]: 0x%x, rq->cmd_type: 0x%x, err: 0x%x\n",
 344                      __func__, stat, good_stat, rq->cmd[0], rq->cmd_type, err);
 345
 346        if (blk_sense_request(rq)) {
 347                /*
 348                 * We got an error trying to get sense info from the drive
 349                 * (probably while trying to recover from a former error).
 350                 * Just give up.
 351                 */
 352                rq->cmd_flags |= REQ_FAILED;
 353                cdrom_end_request(drive, 0);
 354                ide_error(drive, "request sense failure", stat);
 355                return 1;
 356
 357        } else if (blk_pc_request(rq) || rq->cmd_type == REQ_TYPE_ATA_PC) {
 358                /* All other functions, except for READ. */
 359
 360                /*
 361                 * if we have an error, pass back CHECK_CONDITION as the
 362                 * scsi status byte
 363                 */
 364                if (blk_pc_request(rq) && !rq->errors)
 365                        rq->errors = SAM_STAT_CHECK_CONDITION;
 366
 367                /* check for tray open */
 368                if (sense_key == NOT_READY) {
 369                        cdrom_saw_media_change(drive);
 370                } else if (sense_key == UNIT_ATTENTION) {
 371                        /* check for media change */
 372                        cdrom_saw_media_change(drive);
 373                        return 0;
 374                } else if (sense_key == ILLEGAL_REQUEST &&
 375                           rq->cmd[0] == GPCMD_START_STOP_UNIT) {
 376                        /*
 377                         * Don't print error message for this condition--
 378                         * SFF8090i indicates that 5/24/00 is the correct
 379                         * response to a request to close the tray if the
 380                         * drive doesn't have that capability.
 381                         * cdrom_log_sense() knows this!
 382                         */
 383                } else if (!(rq->cmd_flags & REQ_QUIET)) {
 384                        /* otherwise, print an error */
 385                        ide_dump_status(drive, "packet command error", stat);
 386                }
 387
 388                rq->cmd_flags |= REQ_FAILED;
 389
 390                /*
 391                 * instead of playing games with moving completions around,
 392                 * remove failed request completely and end it when the
 393                 * request sense has completed
 394                 */
 395                goto end_request;
 396
 397        } else if (blk_fs_request(rq)) {
 398                int do_end_request = 0;
 399
 400                /* handle errors from READ and WRITE requests */
 401
 402                if (blk_noretry_request(rq))
 403                        do_end_request = 1;
 404
 405                if (sense_key == NOT_READY) {
 406                        /* tray open */
 407                        if (rq_data_dir(rq) == READ) {
 408                                cdrom_saw_media_change(drive);
 409
 410                                /* fail the request */
 411                                printk(KERN_ERR PFX "%s: tray open\n",
 412                                                drive->name);
 413                                do_end_request = 1;
 414                        } else {
 415                                struct cdrom_info *info = drive->driver_data;
 416
 417                                /*
 418                                 * Allow the drive 5 seconds to recover, some
 419                                 * devices will return this error while flushing
 420                                 * data from cache.
 421                                 */
 422                                if (!rq->errors)
 423                                        info->write_timeout = jiffies +
 424                                                        ATAPI_WAIT_WRITE_BUSY;
 425                                rq->errors = 1;
 426                                if (time_after(jiffies, info->write_timeout))
 427                                        do_end_request = 1;
 428                                else {
 429                                        unsigned long flags;
 430
 431                                        /*
 432                                         * take a breather relying on the unplug
 433                                         * timer to kick us again
 434                                         */
 435                                        spin_lock_irqsave(&ide_lock, flags);
 436                                        blk_plug_device(drive->queue);
 437                                        spin_unlock_irqrestore(&ide_lock,
 438                                                                flags);
 439                                        return 1;
 440                                }
 441                        }
 442                } else if (sense_key == UNIT_ATTENTION) {
 443                        /* media change */
 444                        cdrom_saw_media_change(drive);
 445
 446                        /*
 447                         * Arrange to retry the request but be sure to give up
 448                         * if we've retried too many times.
 449                         */
 450                        if (++rq->errors > ERROR_MAX)
 451                                do_end_request = 1;
 452                } else if (sense_key == ILLEGAL_REQUEST ||
 453                           sense_key == DATA_PROTECT) {
 454                        /*
 455                         * No point in retrying after an illegal request or data
 456                         * protect error.
 457                         */
 458                        ide_dump_status_no_sense(drive, "command error", stat);
 459                        do_end_request = 1;
 460                } else if (sense_key == MEDIUM_ERROR) {
 461                        /*
 462                         * No point in re-trying a zillion times on a bad
 463                         * sector. If we got here the error is not correctable.
 464                         */
 465                        ide_dump_status_no_sense(drive,
 466                                                 "media error (bad sector)",
 467                                                 stat);
 468                        do_end_request = 1;
 469                } else if (sense_key == BLANK_CHECK) {
 470                        /* disk appears blank ?? */
 471                        ide_dump_status_no_sense(drive, "media error (blank)",
 472                                                 stat);
 473                        do_end_request = 1;
 474                } else if ((err & ~ATA_ABORTED) != 0) {
 475                        /* go to the default handler for other errors */
 476                        ide_error(drive, "cdrom_decode_status", stat);
 477                        return 1;
 478                } else if ((++rq->errors > ERROR_MAX)) {
 479                        /* we've racked up too many retries, abort */
 480                        do_end_request = 1;
 481                }
 482
 483                /*
 484                 * End a request through request sense analysis when we have
 485                 * sense data. We need this in order to perform end of media
 486                 * processing.
 487                 */
 488                if (do_end_request)
 489                        goto end_request;
 490
 491                /*
 492                 * If we got a CHECK_CONDITION status, queue
 493                 * a request sense command.
 494                 */
 495                if (stat & ATA_ERR)
 496                        cdrom_queue_request_sense(drive, NULL, NULL);
 497        } else {
 498                blk_dump_rq_flags(rq, PFX "bad rq");
 499                cdrom_end_request(drive, 0);
 500        }
 501
 502        /* retry, or handle the next request */
 503        return 1;
 504
 505end_request:
 506        if (stat & ATA_ERR) {
 507                unsigned long flags;
 508
 509                spin_lock_irqsave(&ide_lock, flags);
 510                blkdev_dequeue_request(rq);
 511                HWGROUP(drive)->rq = NULL;
 512                spin_unlock_irqrestore(&ide_lock, flags);
 513
 514                cdrom_queue_request_sense(drive, rq->sense, rq);
 515        } else
 516                cdrom_end_request(drive, 0);
 517
 518        return 1;
 519}
 520
 521static int cdrom_timer_expiry(ide_drive_t *drive)
 522{
 523        struct request *rq = HWGROUP(drive)->rq;
 524        unsigned long wait = 0;
 525
 526        ide_debug_log(IDE_DBG_RQ, "Call %s: rq->cmd[0]: 0x%x\n", __func__,
 527                      rq->cmd[0]);
 528
 529        /*
 530         * Some commands are *slow* and normally take a long time to complete.
 531         * Usually we can use the ATAPI "disconnect" to bypass this, but not all
 532         * commands/drives support that. Let ide_timer_expiry keep polling us
 533         * for these.
 534         */
 535        switch (rq->cmd[0]) {
 536        case GPCMD_BLANK:
 537        case GPCMD_FORMAT_UNIT:
 538        case GPCMD_RESERVE_RZONE_TRACK:
 539        case GPCMD_CLOSE_TRACK:
 540        case GPCMD_FLUSH_CACHE:
 541                wait = ATAPI_WAIT_PC;
 542                break;
 543        default:
 544                if (!(rq->cmd_flags & REQ_QUIET))
 545                        printk(KERN_INFO PFX "cmd 0x%x timed out\n",
 546                                         rq->cmd[0]);
 547                wait = 0;
 548                break;
 549        }
 550        return wait;
 551}
 552
 553/*
 554 * Set up the device registers for transferring a packet command on DEV,
 555 * expecting to later transfer XFERLEN bytes.  HANDLER is the routine
 556 * which actually transfers the command to the drive.  If this is a
 557 * drq_interrupt device, this routine will arrange for HANDLER to be
 558 * called when the interrupt from the drive arrives.  Otherwise, HANDLER
 559 * will be called immediately after the drive is prepared for the transfer.
 560 */
 561static ide_startstop_t cdrom_start_packet_command(ide_drive_t *drive,
 562                                                  int xferlen,
 563                                                  ide_handler_t *handler)
 564{
 565        ide_hwif_t *hwif = drive->hwif;
 566
 567        ide_debug_log(IDE_DBG_PC, "Call %s, xferlen: %d\n", __func__, xferlen);
 568
 569        /* FIXME: for Virtual DMA we must check harder */
 570        if (drive->dma)
 571                drive->dma = !hwif->dma_ops->dma_setup(drive);
 572
 573        /* set up the controller registers */
 574        ide_pktcmd_tf_load(drive, IDE_TFLAG_OUT_NSECT | IDE_TFLAG_OUT_LBAL,
 575                           xferlen, drive->dma);
 576
 577        if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
 578                /* waiting for CDB interrupt, not DMA yet. */
 579                if (drive->dma)
 580                        drive->waiting_for_dma = 0;
 581
 582                /* packet command */
 583                ide_execute_command(drive, ATA_CMD_PACKET, handler,
 584                                    ATAPI_WAIT_PC, cdrom_timer_expiry);
 585                return ide_started;
 586        } else {
 587                ide_execute_pkt_cmd(drive);
 588
 589                return (*handler) (drive);
 590        }
 591}
 592
 593/*
 594 * Send a packet command to DRIVE described by CMD_BUF and CMD_LEN. The device
 595 * registers must have already been prepared by cdrom_start_packet_command.
 596 * HANDLER is the interrupt handler to call when the command completes or
 597 * there's data ready.
 598 */
 599#define ATAPI_MIN_CDB_BYTES 12
 600static ide_startstop_t cdrom_transfer_packet_command(ide_drive_t *drive,
 601                                          struct request *rq,
 602                                          ide_handler_t *handler)
 603{
 604        ide_hwif_t *hwif = drive->hwif;
 605        int cmd_len;
 606        ide_startstop_t startstop;
 607
 608        ide_debug_log(IDE_DBG_PC, "Call %s\n", __func__);
 609
 610        if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
 611                /*
 612                 * Here we should have been called after receiving an interrupt
 613                 * from the device.  DRQ should how be set.
 614                 */
 615
 616                /* check for errors */
 617                if (cdrom_decode_status(drive, ATA_DRQ, NULL))
 618                        return ide_stopped;
 619
 620                /* ok, next interrupt will be DMA interrupt */
 621                if (drive->dma)
 622                        drive->waiting_for_dma = 1;
 623        } else {
 624                /* otherwise, we must wait for DRQ to get set */
 625                if (ide_wait_stat(&startstop, drive, ATA_DRQ,
 626                                  ATA_BUSY, WAIT_READY))
 627                        return startstop;
 628        }
 629
 630        /* arm the interrupt handler */
 631        ide_set_handler(drive, handler, rq->timeout, cdrom_timer_expiry);
 632
 633        /* ATAPI commands get padded out to 12 bytes minimum */
 634        cmd_len = COMMAND_SIZE(rq->cmd[0]);
 635        if (cmd_len < ATAPI_MIN_CDB_BYTES)
 636                cmd_len = ATAPI_MIN_CDB_BYTES;
 637
 638        /* send the command to the device */
 639        hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);
 640
 641        /* start the DMA if need be */
 642        if (drive->dma)
 643                hwif->dma_ops->dma_start(drive);
 644
 645        return ide_started;
 646}
 647
 648/*
 649 * Check the contents of the interrupt reason register from the cdrom
 650 * and attempt to recover if there are problems.  Returns  0 if everything's
 651 * ok; nonzero if the request has been terminated.
 652 */
 653static int ide_cd_check_ireason(ide_drive_t *drive, struct request *rq,
 654                                int len, int ireason, int rw)
 655{
 656        ide_hwif_t *hwif = drive->hwif;
 657
 658        ide_debug_log(IDE_DBG_FUNC, "Call %s, ireason: 0x%x, rw: 0x%x\n",
 659                      __func__, ireason, rw);
 660
 661        /*
 662         * ireason == 0: the drive wants to receive data from us
 663         * ireason == 2: the drive is expecting to transfer data to us
 664         */
 665        if (ireason == (!rw << 1))
 666                return 0;
 667        else if (ireason == (rw << 1)) {
 668
 669                /* whoops... */
 670                printk(KERN_ERR PFX "%s: %s: wrong transfer direction!\n",
 671                                drive->name, __func__);
 672
 673                ide_pad_transfer(drive, rw, len);
 674        } else  if (rw == 0 && ireason == 1) {
 675                /*
 676                 * Some drives (ASUS) seem to tell us that status info is
 677                 * available.  Just get it and ignore.
 678                 */
 679                (void)hwif->tp_ops->read_status(hwif);
 680                return 0;
 681        } else {
 682                /* drive wants a command packet, or invalid ireason... */
 683                printk(KERN_ERR PFX "%s: %s: bad interrupt reason 0x%02x\n",
 684                                drive->name, __func__, ireason);
 685        }
 686
 687        if (rq->cmd_type == REQ_TYPE_ATA_PC)
 688                rq->cmd_flags |= REQ_FAILED;
 689
 690        cdrom_end_request(drive, 0);
 691        return -1;
 692}
 693
 694/*
 695 * Assume that the drive will always provide data in multiples of at least
 696 * SECTOR_SIZE, as it gets hairy to keep track of the transfers otherwise.
 697 */
 698static int ide_cd_check_transfer_size(ide_drive_t *drive, int len)
 699{
 700        ide_debug_log(IDE_DBG_FUNC, "Call %s, len: %d\n", __func__, len);
 701
 702        if ((len % SECTOR_SIZE) == 0)
 703                return 0;
 704
 705        printk(KERN_ERR PFX "%s: %s: Bad transfer size %d\n", drive->name,
 706                        __func__, len);
 707
 708        if (drive->atapi_flags & IDE_AFLAG_LIMIT_NFRAMES)
 709                printk(KERN_ERR PFX "This drive is not supported by this "
 710                                "version of the driver\n");
 711        else {
 712                printk(KERN_ERR PFX "Trying to limit transfer sizes\n");
 713                drive->atapi_flags |= IDE_AFLAG_LIMIT_NFRAMES;
 714        }
 715
 716        return 1;
 717}
 718
 719static ide_startstop_t cdrom_newpc_intr(ide_drive_t *);
 720
 721static ide_startstop_t ide_cd_prepare_rw_request(ide_drive_t *drive,
 722                                                 struct request *rq)
 723{
 724        ide_debug_log(IDE_DBG_RQ, "Call %s: rq->cmd_flags: 0x%x\n", __func__,
 725                      rq->cmd_flags);
 726
 727        if (rq_data_dir(rq) == READ) {
 728                unsigned short sectors_per_frame =
 729                        queue_hardsect_size(drive->queue) >> SECTOR_BITS;
 730                int nskip = rq->sector & (sectors_per_frame - 1);
 731
 732                /*
 733                 * If the requested sector doesn't start on a frame boundary,
 734                 * we must adjust the start of the transfer so that it does,
 735                 * and remember to skip the first few sectors.
 736                 *
 737                 * If the rq->current_nr_sectors field is larger than the size
 738                 * of the buffer, it will mean that we're to skip a number of
 739                 * sectors equal to the amount by which rq->current_nr_sectors
 740                 * is larger than the buffer size.
 741                 */
 742                if (nskip > 0) {
 743                        /* sanity check... */
 744                        if (rq->current_nr_sectors !=
 745                            bio_cur_sectors(rq->bio)) {
 746                                printk(KERN_ERR PFX "%s: %s: buffer botch (%u)\n",
 747                                                drive->name, __func__,
 748                                                rq->current_nr_sectors);
 749                                cdrom_end_request(drive, 0);
 750                                return ide_stopped;
 751                        }
 752                        rq->current_nr_sectors += nskip;
 753                }
 754        }
 755
 756        /* set up the command */
 757        rq->timeout = ATAPI_WAIT_PC;
 758
 759        return ide_started;
 760}
 761
 762/*
 763 * Routine to send a read/write packet command to the drive. This is usually
 764 * called directly from cdrom_start_{read,write}(). However, for drq_interrupt
 765 * devices, it is called from an interrupt when the drive is ready to accept
 766 * the command.
 767 */
 768static ide_startstop_t cdrom_start_rw_cont(ide_drive_t *drive)
 769{
 770        struct request *rq = drive->hwif->hwgroup->rq;
 771
 772        /* send the command to the drive and return */
 773        return cdrom_transfer_packet_command(drive, rq, cdrom_newpc_intr);
 774}
 775
 776#define IDECD_SEEK_THRESHOLD    (1000)                  /* 1000 blocks */
 777#define IDECD_SEEK_TIMER        (5 * WAIT_MIN_SLEEP)    /* 100 ms */
 778#define IDECD_SEEK_TIMEOUT      (2 * WAIT_CMD)          /* 20 sec */
 779
 780static ide_startstop_t cdrom_seek_intr(ide_drive_t *drive)
 781{
 782        struct cdrom_info *info = drive->driver_data;
 783        int stat;
 784        static int retry = 10;
 785
 786        ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
 787
 788        if (cdrom_decode_status(drive, 0, &stat))
 789                return ide_stopped;
 790
 791        drive->atapi_flags |= IDE_AFLAG_SEEKING;
 792
 793        if (retry && time_after(jiffies, info->start_seek + IDECD_SEEK_TIMER)) {
 794                if (--retry == 0)
 795                        drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
 796        }
 797        return ide_stopped;
 798}
 799
 800static void ide_cd_prepare_seek_request(ide_drive_t *drive, struct request *rq)
 801{
 802        sector_t frame = rq->sector;
 803
 804        ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
 805
 806        sector_div(frame, queue_hardsect_size(drive->queue) >> SECTOR_BITS);
 807
 808        memset(rq->cmd, 0, BLK_MAX_CDB);
 809        rq->cmd[0] = GPCMD_SEEK;
 810        put_unaligned(cpu_to_be32(frame), (unsigned int *) &rq->cmd[2]);
 811
 812        rq->timeout = ATAPI_WAIT_PC;
 813}
 814
 815static ide_startstop_t cdrom_start_seek_continuation(ide_drive_t *drive)
 816{
 817        struct request *rq = drive->hwif->hwgroup->rq;
 818
 819        return cdrom_transfer_packet_command(drive, rq, &cdrom_seek_intr);
 820}
 821
 822/*
 823 * Fix up a possibly partially-processed request so that we can start it over
 824 * entirely, or even put it back on the request queue.
 825 */
 826static void ide_cd_restore_request(ide_drive_t *drive, struct request *rq)
 827{
 828
 829        ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
 830
 831        if (rq->buffer != bio_data(rq->bio)) {
 832                sector_t n =
 833                        (rq->buffer - (char *)bio_data(rq->bio)) / SECTOR_SIZE;
 834
 835                rq->buffer = bio_data(rq->bio);
 836                rq->nr_sectors += n;
 837                rq->sector -= n;
 838        }
 839        rq->current_nr_sectors = bio_cur_sectors(rq->bio);
 840        rq->hard_cur_sectors = rq->current_nr_sectors;
 841        rq->hard_nr_sectors = rq->nr_sectors;
 842        rq->hard_sector = rq->sector;
 843        rq->q->prep_rq_fn(rq->q, rq);
 844}
 845
 846static void ide_cd_request_sense_fixup(ide_drive_t *drive, struct request *rq)
 847{
 848        ide_debug_log(IDE_DBG_FUNC, "Call %s, rq->cmd[0]: 0x%x\n",
 849                      __func__, rq->cmd[0]);
 850
 851        /*
 852         * Some of the trailing request sense fields are optional,
 853         * and some drives don't send them.  Sigh.
 854         */
 855        if (rq->cmd[0] == GPCMD_REQUEST_SENSE &&
 856            rq->data_len > 0 && rq->data_len <= 5)
 857                while (rq->data_len > 0) {
 858                        *(u8 *)rq->data++ = 0;
 859                        --rq->data_len;
 860                }
 861}
 862
 863int ide_cd_queue_pc(ide_drive_t *drive, const unsigned char *cmd,
 864                    int write, void *buffer, unsigned *bufflen,
 865                    struct request_sense *sense, int timeout,
 866                    unsigned int cmd_flags)
 867{
 868        struct cdrom_info *info = drive->driver_data;
 869        struct request_sense local_sense;
 870        int retries = 10;
 871        unsigned int flags = 0;
 872
 873        if (!sense)
 874                sense = &local_sense;
 875
 876        ide_debug_log(IDE_DBG_PC, "Call %s, cmd[0]: 0x%x, write: 0x%x, "
 877                      "timeout: %d, cmd_flags: 0x%x\n", __func__, cmd[0], write,
 878                      timeout, cmd_flags);
 879
 880        /* start of retry loop */
 881        do {
 882                struct request *rq;
 883                int error;
 884
 885                rq = blk_get_request(drive->queue, write, __GFP_WAIT);
 886
 887                memcpy(rq->cmd, cmd, BLK_MAX_CDB);
 888                rq->cmd_type = REQ_TYPE_ATA_PC;
 889                rq->sense = sense;
 890                rq->cmd_flags |= cmd_flags;
 891                rq->timeout = timeout;
 892                if (buffer) {
 893                        rq->data = buffer;
 894                        rq->data_len = *bufflen;
 895                }
 896
 897                error = blk_execute_rq(drive->queue, info->disk, rq, 0);
 898
 899                if (buffer)
 900                        *bufflen = rq->data_len;
 901
 902                flags = rq->cmd_flags;
 903                blk_put_request(rq);
 904
 905                /*
 906                 * FIXME: we should probably abort/retry or something in case of
 907                 * failure.
 908                 */
 909                if (flags & REQ_FAILED) {
 910                        /*
 911                         * The request failed.  Retry if it was due to a unit
 912                         * attention status (usually means media was changed).
 913                         */
 914                        struct request_sense *reqbuf = sense;
 915
 916                        if (reqbuf->sense_key == UNIT_ATTENTION)
 917                                cdrom_saw_media_change(drive);
 918                        else if (reqbuf->sense_key == NOT_READY &&
 919                                 reqbuf->asc == 4 && reqbuf->ascq != 4) {
 920                                /*
 921                                 * The drive is in the process of loading
 922                                 * a disk.  Retry, but wait a little to give
 923                                 * the drive time to complete the load.
 924                                 */
 925                                ssleep(2);
 926                        } else {
 927                                /* otherwise, don't retry */
 928                                retries = 0;
 929                        }
 930                        --retries;
 931                }
 932
 933                /* end of retry loop */
 934        } while ((flags & REQ_FAILED) && retries >= 0);
 935
 936        /* return an error if the command failed */
 937        return (flags & REQ_FAILED) ? -EIO : 0;
 938}
 939
 940/*
 941 * Called from blk_end_request_callback() after the data of the request is
 942 * completed and before the request itself is completed. By returning value '1',
 943 * blk_end_request_callback() returns immediately without completing it.
 944 */
 945static int cdrom_newpc_intr_dummy_cb(struct request *rq)
 946{
 947        return 1;
 948}
 949
 950static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
 951{
 952        ide_hwif_t *hwif = drive->hwif;
 953        struct request *rq = HWGROUP(drive)->rq;
 954        xfer_func_t *xferfunc;
 955        ide_expiry_t *expiry = NULL;
 956        int dma_error = 0, dma, stat, thislen, uptodate = 0;
 957        int write = (rq_data_dir(rq) == WRITE) ? 1 : 0;
 958        unsigned int timeout;
 959        u16 len;
 960        u8 ireason;
 961
 962        ide_debug_log(IDE_DBG_PC, "Call %s, rq->cmd[0]: 0x%x, write: 0x%x\n",
 963                      __func__, rq->cmd[0], write);
 964
 965        /* check for errors */
 966        dma = drive->dma;
 967        if (dma) {
 968                drive->dma = 0;
 969                dma_error = hwif->dma_ops->dma_end(drive);
 970                if (dma_error) {
 971                        printk(KERN_ERR PFX "%s: DMA %s error\n", drive->name,
 972                                        write ? "write" : "read");
 973                        ide_dma_off(drive);
 974                }
 975        }
 976
 977        if (cdrom_decode_status(drive, 0, &stat))
 978                return ide_stopped;
 979
 980        /* using dma, transfer is complete now */
 981        if (dma) {
 982                if (dma_error)
 983                        return ide_error(drive, "dma error", stat);
 984                if (blk_fs_request(rq)) {
 985                        ide_end_request(drive, 1, rq->nr_sectors);
 986                        return ide_stopped;
 987                }
 988                goto end_request;
 989        }
 990
 991        ide_read_bcount_and_ireason(drive, &len, &ireason);
 992
 993        thislen = blk_fs_request(rq) ? len : rq->data_len;
 994        if (thislen > len)
 995                thislen = len;
 996
 997        ide_debug_log(IDE_DBG_PC, "%s: DRQ: stat: 0x%x, thislen: %d\n",
 998                      __func__, stat, thislen);
 999
1000        /* If DRQ is clear, the command has completed. */
1001        if ((stat & ATA_DRQ) == 0) {
1002                if (blk_fs_request(rq)) {
1003                        /*
1004                         * If we're not done reading/writing, complain.
1005                         * Otherwise, complete the command normally.
1006                         */
1007                        uptodate = 1;
1008                        if (rq->current_nr_sectors > 0) {
1009                                printk(KERN_ERR PFX "%s: %s: data underrun "
1010                                                "(%d blocks)\n",
1011                                                drive->name, __func__,
1012                                                rq->current_nr_sectors);
1013                                if (!write)
1014                                        rq->cmd_flags |= REQ_FAILED;
1015                                uptodate = 0;
1016                        }
1017                        cdrom_end_request(drive, uptodate);
1018                        return ide_stopped;
1019                } else if (!blk_pc_request(rq)) {
1020                        ide_cd_request_sense_fixup(drive, rq);
1021                        /* complain if we still have data left to transfer */
1022                        uptodate = rq->data_len ? 0 : 1;
1023                }
1024                goto end_request;
1025        }
1026
1027        /* check which way to transfer data */
1028        if (ide_cd_check_ireason(drive, rq, len, ireason, write))
1029                return ide_stopped;
1030
1031        if (blk_fs_request(rq)) {
1032                if (write == 0) {
1033                        int nskip;
1034
1035                        if (ide_cd_check_transfer_size(drive, len)) {
1036                                cdrom_end_request(drive, 0);
1037                                return ide_stopped;
1038                        }
1039
1040                        /*
1041                         * First, figure out if we need to bit-bucket
1042                         * any of the leading sectors.
1043                         */
1044                        nskip = min_t(int, rq->current_nr_sectors
1045                                           - bio_cur_sectors(rq->bio),
1046                                           thislen >> 9);
1047                        if (nskip > 0) {
1048                                ide_pad_transfer(drive, write, nskip << 9);
1049                                rq->current_nr_sectors -= nskip;
1050                                thislen -= (nskip << 9);
1051                        }
1052                }
1053        }
1054
1055        if (ireason == 0) {
1056                write = 1;
1057                xferfunc = hwif->tp_ops->output_data;
1058        } else {
1059                write = 0;
1060                xferfunc = hwif->tp_ops->input_data;
1061        }
1062
1063        ide_debug_log(IDE_DBG_PC, "%s: data transfer, rq->cmd_type: 0x%x, "
1064                      "ireason: 0x%x\n", __func__, rq->cmd_type, ireason);
1065
1066        /* transfer data */
1067        while (thislen > 0) {
1068                u8 *ptr = blk_fs_request(rq) ? NULL : rq->data;
1069                int blen = rq->data_len;
1070
1071                /* bio backed? */
1072                if (rq->bio) {
1073                        if (blk_fs_request(rq)) {
1074                                ptr = rq->buffer;
1075                                blen = rq->current_nr_sectors << 9;
1076                        } else {
1077                                ptr = bio_data(rq->bio);
1078                                blen = bio_iovec(rq->bio)->bv_len;
1079                        }
1080                }
1081
1082                if (!ptr) {
1083                        if (blk_fs_request(rq) && !write)
1084                                /*
1085                                 * If the buffers are full, pipe the rest into
1086                                 * oblivion.
1087                                 */
1088                                ide_pad_transfer(drive, 0, thislen);
1089                        else {
1090                                printk(KERN_ERR PFX "%s: confused, missing data\n",
1091                                                drive->name);
1092                                blk_dump_rq_flags(rq, rq_data_dir(rq)
1093                                                  ? "cdrom_newpc_intr, write"
1094                                                  : "cdrom_newpc_intr, read");
1095                        }
1096                        break;
1097                }
1098
1099                if (blen > thislen)
1100                        blen = thislen;
1101
1102                xferfunc(drive, NULL, ptr, blen);
1103
1104                thislen -= blen;
1105                len -= blen;
1106
1107                if (blk_fs_request(rq)) {
1108                        rq->buffer += blen;
1109                        rq->nr_sectors -= (blen >> 9);
1110                        rq->current_nr_sectors -= (blen >> 9);
1111                        rq->sector += (blen >> 9);
1112
1113                        if (rq->current_nr_sectors == 0 && rq->nr_sectors)
1114                                cdrom_end_request(drive, 1);
1115                } else {
1116                        rq->data_len -= blen;
1117
1118                        /*
1119                         * The request can't be completed until DRQ is cleared.
1120                         * So complete the data, but don't complete the request
1121                         * using the dummy function for the callback feature
1122                         * of blk_end_request_callback().
1123                         */
1124                        if (rq->bio)
1125                                blk_end_request_callback(rq, 0, blen,
1126                                                 cdrom_newpc_intr_dummy_cb);
1127                        else
1128                                rq->data += blen;
1129                }
1130                if (!write && blk_sense_request(rq))
1131                        rq->sense_len += blen;
1132        }
1133
1134        /* pad, if necessary */
1135        if (!blk_fs_request(rq) && len > 0)
1136                ide_pad_transfer(drive, write, len);
1137
1138        if (blk_pc_request(rq)) {
1139                timeout = rq->timeout;
1140        } else {
1141                timeout = ATAPI_WAIT_PC;
1142                if (!blk_fs_request(rq))
1143                        expiry = cdrom_timer_expiry;
1144        }
1145
1146        ide_set_handler(drive, cdrom_newpc_intr, timeout, expiry);
1147        return ide_started;
1148
1149end_request:
1150        if (blk_pc_request(rq)) {
1151                unsigned long flags;
1152                unsigned int dlen = rq->data_len;
1153
1154                if (dma)
1155                        rq->data_len = 0;
1156
1157                spin_lock_irqsave(&ide_lock, flags);
1158                if (__blk_end_request(rq, 0, dlen))
1159                        BUG();
1160                HWGROUP(drive)->rq = NULL;
1161                spin_unlock_irqrestore(&ide_lock, flags);
1162        } else {
1163                if (!uptodate)
1164                        rq->cmd_flags |= REQ_FAILED;
1165                cdrom_end_request(drive, uptodate);
1166        }
1167        return ide_stopped;
1168}
1169
1170static ide_startstop_t cdrom_start_rw(ide_drive_t *drive, struct request *rq)
1171{
1172        struct cdrom_info *cd = drive->driver_data;
1173        int write = rq_data_dir(rq) == WRITE;
1174        unsigned short sectors_per_frame =
1175                queue_hardsect_size(drive->queue) >> SECTOR_BITS;
1176
1177        ide_debug_log(IDE_DBG_RQ, "Call %s, rq->cmd[0]: 0x%x, write: 0x%x, "
1178                      "secs_per_frame: %u\n",
1179                      __func__, rq->cmd[0], write, sectors_per_frame);
1180
1181        if (write) {
1182                /* disk has become write protected */
1183                if (get_disk_ro(cd->disk)) {
1184                        cdrom_end_request(drive, 0);
1185                        return ide_stopped;
1186                }
1187        } else {
1188                /*
1189                 * We may be retrying this request after an error.  Fix up any
1190                 * weirdness which might be present in the request packet.
1191                 */
1192                ide_cd_restore_request(drive, rq);
1193        }
1194
1195        /* use DMA, if possible / writes *must* be hardware frame aligned */
1196        if ((rq->nr_sectors & (sectors_per_frame - 1)) ||
1197            (rq->sector & (sectors_per_frame - 1))) {
1198                if (write) {
1199                        cdrom_end_request(drive, 0);
1200                        return ide_stopped;
1201                }
1202                drive->dma = 0;
1203        } else
1204                drive->dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
1205
1206        if (write)
1207                cd->devinfo.media_written = 1;
1208
1209        return ide_started;
1210}
1211
1212static ide_startstop_t cdrom_do_newpc_cont(ide_drive_t *drive)
1213{
1214        struct request *rq = HWGROUP(drive)->rq;
1215
1216        return cdrom_transfer_packet_command(drive, rq, cdrom_newpc_intr);
1217}
1218
1219static void cdrom_do_block_pc(ide_drive_t *drive, struct request *rq)
1220{
1221
1222        ide_debug_log(IDE_DBG_PC, "Call %s, rq->cmd[0]: 0x%x, "
1223                      "rq->cmd_type: 0x%x\n", __func__, rq->cmd[0],
1224                      rq->cmd_type);
1225
1226        if (blk_pc_request(rq))
1227                rq->cmd_flags |= REQ_QUIET;
1228        else
1229                rq->cmd_flags &= ~REQ_FAILED;
1230
1231        drive->dma = 0;
1232
1233        /* sg request */
1234        if (rq->bio || ((rq->cmd_type == REQ_TYPE_ATA_PC) && rq->data_len)) {
1235                struct request_queue *q = drive->queue;
1236                unsigned int alignment;
1237                char *buf;
1238
1239                if (rq->bio)
1240                        buf = bio_data(rq->bio);
1241                else
1242                        buf = rq->data;
1243
1244                drive->dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
1245
1246                /*
1247                 * check if dma is safe
1248                 *
1249                 * NOTE! The "len" and "addr" checks should possibly have
1250                 * separate masks.
1251                 */
1252                alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1253                if ((unsigned long)buf & alignment
1254                    || rq->data_len & q->dma_pad_mask
1255                    || object_is_on_stack(buf))
1256                        drive->dma = 0;
1257        }
1258}
1259
1260static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
1261                                        sector_t block)
1262{
1263        struct cdrom_info *info = drive->driver_data;
1264        ide_handler_t *fn;
1265        int xferlen;
1266
1267        ide_debug_log(IDE_DBG_RQ, "Call %s, rq->cmd[0]: 0x%x, "
1268                      "rq->cmd_type: 0x%x, block: %llu\n",
1269                      __func__, rq->cmd[0], rq->cmd_type,
1270                      (unsigned long long)block);
1271
1272        if (blk_fs_request(rq)) {
1273                if (drive->atapi_flags & IDE_AFLAG_SEEKING) {
1274                        ide_hwif_t *hwif = drive->hwif;
1275                        unsigned long elapsed = jiffies - info->start_seek;
1276                        int stat = hwif->tp_ops->read_status(hwif);
1277
1278                        if ((stat & ATA_DSC) != ATA_DSC) {
1279                                if (elapsed < IDECD_SEEK_TIMEOUT) {
1280                                        ide_stall_queue(drive,
1281                                                        IDECD_SEEK_TIMER);
1282                                        return ide_stopped;
1283                                }
1284                                printk(KERN_ERR PFX "%s: DSC timeout\n",
1285                                                drive->name);
1286                        }
1287                        drive->atapi_flags &= ~IDE_AFLAG_SEEKING;
1288                }
1289                if (rq_data_dir(rq) == READ &&
1290                    IDE_LARGE_SEEK(info->last_block, block,
1291                            IDECD_SEEK_THRESHOLD) &&
1292                    (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP)) {
1293                        xferlen = 0;
1294                        fn = cdrom_start_seek_continuation;
1295
1296                        drive->dma = 0;
1297                        info->start_seek = jiffies;
1298
1299                        ide_cd_prepare_seek_request(drive, rq);
1300                } else {
1301                        xferlen = 32768;
1302                        fn = cdrom_start_rw_cont;
1303
1304                        if (cdrom_start_rw(drive, rq) == ide_stopped)
1305                                return ide_stopped;
1306
1307                        if (ide_cd_prepare_rw_request(drive, rq) == ide_stopped)
1308                                return ide_stopped;
1309                }
1310                info->last_block = block;
1311        } else if (blk_sense_request(rq) || blk_pc_request(rq) ||
1312                   rq->cmd_type == REQ_TYPE_ATA_PC) {
1313                xferlen = rq->data_len;
1314                fn = cdrom_do_newpc_cont;
1315
1316                if (!rq->timeout)
1317                        rq->timeout = ATAPI_WAIT_PC;
1318
1319                cdrom_do_block_pc(drive, rq);
1320        } else if (blk_special_request(rq)) {
1321                /* right now this can only be a reset... */
1322                cdrom_end_request(drive, 1);
1323                return ide_stopped;
1324        } else {
1325                blk_dump_rq_flags(rq, DRV_NAME " bad flags");
1326                cdrom_end_request(drive, 0);
1327                return ide_stopped;
1328        }
1329
1330        return cdrom_start_packet_command(drive, xferlen, fn);
1331}
1332
1333/*
1334 * Ioctl handling.
1335 *
1336 * Routines which queue packet commands take as a final argument a pointer to a
1337 * request_sense struct. If execution of the command results in an error with a
1338 * CHECK CONDITION status, this structure will be filled with the results of the
1339 * subsequent request sense command. The pointer can also be NULL, in which case
1340 * no sense information is returned.
1341 */
1342static void msf_from_bcd(struct atapi_msf *msf)
1343{
1344        msf->minute = bcd2bin(msf->minute);
1345        msf->second = bcd2bin(msf->second);
1346        msf->frame  = bcd2bin(msf->frame);
1347}
1348
1349int cdrom_check_status(ide_drive_t *drive, struct request_sense *sense)
1350{
1351        struct cdrom_info *info = drive->driver_data;
1352        struct cdrom_device_info *cdi = &info->devinfo;
1353        unsigned char cmd[BLK_MAX_CDB];
1354
1355        ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
1356
1357        memset(cmd, 0, BLK_MAX_CDB);
1358        cmd[0] = GPCMD_TEST_UNIT_READY;
1359
1360        /*
1361         * Sanyo 3 CD changer uses byte 7 of TEST_UNIT_READY to switch CDs
1362         * instead of supporting the LOAD_UNLOAD opcode.
1363         */
1364        cmd[7] = cdi->sanyo_slot % 3;
1365
1366        return ide_cd_queue_pc(drive, cmd, 0, NULL, NULL, sense, 0, REQ_QUIET);
1367}
1368
1369static int cdrom_read_capacity(ide_drive_t *drive, unsigned long *capacity,
1370                               unsigned long *sectors_per_frame,
1371                               struct request_sense *sense)
1372{
1373        struct {
1374                __be32 lba;
1375                __be32 blocklen;
1376        } capbuf;
1377
1378        int stat;
1379        unsigned char cmd[BLK_MAX_CDB];
1380        unsigned len = sizeof(capbuf);
1381        u32 blocklen;
1382
1383        ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
1384
1385        memset(cmd, 0, BLK_MAX_CDB);
1386        cmd[0] = GPCMD_READ_CDVD_CAPACITY;
1387
1388        stat = ide_cd_queue_pc(drive, cmd, 0, &capbuf, &len, sense, 0,
1389                               REQ_QUIET);
1390        if (stat)
1391                return stat;
1392
1393        /*
1394         * Sanity check the given block size
1395         */
1396        blocklen = be32_to_cpu(capbuf.blocklen);
1397        switch (blocklen) {
1398        case 512:
1399        case 1024:
1400        case 2048:
1401        case 4096:
1402                break;
1403        default:
1404                printk(KERN_ERR PFX "%s: weird block size %u\n",
1405                                drive->name, blocklen);
1406                printk(KERN_ERR PFX "%s: default to 2kb block size\n",
1407                                drive->name);
1408                blocklen = 2048;
1409                break;
1410        }
1411
1412        *capacity = 1 + be32_to_cpu(capbuf.lba);
1413        *sectors_per_frame = blocklen >> SECTOR_BITS;
1414
1415        ide_debug_log(IDE_DBG_PROBE, "%s: cap: %lu, sectors_per_frame: %lu\n",
1416                      __func__, *capacity, *sectors_per_frame);
1417
1418        return 0;
1419}
1420
1421static int cdrom_read_tocentry(ide_drive_t *drive, int trackno, int msf_flag,
1422                                int format, char *buf, int buflen,
1423                                struct request_sense *sense)
1424{
1425        unsigned char cmd[BLK_MAX_CDB];
1426
1427        ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
1428
1429        memset(cmd, 0, BLK_MAX_CDB);
1430
1431        cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
1432        cmd[6] = trackno;
1433        cmd[7] = (buflen >> 8);
1434        cmd[8] = (buflen & 0xff);
1435        cmd[9] = (format << 6);
1436
1437        if (msf_flag)
1438                cmd[1] = 2;
1439
1440        return ide_cd_queue_pc(drive, cmd, 0, buf, &buflen, sense, 0, REQ_QUIET);
1441}
1442
1443/* Try to read the entire TOC for the disk into our internal buffer. */
1444int ide_cd_read_toc(ide_drive_t *drive, struct request_sense *sense)
1445{
1446        int stat, ntracks, i;
1447        struct cdrom_info *info = drive->driver_data;
1448        struct cdrom_device_info *cdi = &info->devinfo;
1449        struct atapi_toc *toc = info->toc;
1450        struct {
1451                struct atapi_toc_header hdr;
1452                struct atapi_toc_entry  ent;
1453        } ms_tmp;
1454        long last_written;
1455        unsigned long sectors_per_frame = SECTORS_PER_FRAME;
1456
1457        ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
1458
1459        if (toc == NULL) {
1460                /* try to allocate space */
1461                toc = kmalloc(sizeof(struct atapi_toc), GFP_KERNEL);
1462                if (toc == NULL) {
1463                        printk(KERN_ERR PFX "%s: No cdrom TOC buffer!\n",
1464                                        drive->name);
1465                        return -ENOMEM;
1466                }
1467                info->toc = toc;
1468        }
1469
1470        /*
1471         * Check to see if the existing data is still valid. If it is,
1472         * just return.
1473         */
1474        (void) cdrom_check_status(drive, sense);
1475
1476        if (drive->atapi_flags & IDE_AFLAG_TOC_VALID)
1477                return 0;
1478
1479        /* try to get the total cdrom capacity and sector size */
1480        stat = cdrom_read_capacity(drive, &toc->capacity, &sectors_per_frame,
1481                                   sense);
1482        if (stat)
1483                toc->capacity = 0x1fffff;
1484
1485        set_capacity(info->disk, toc->capacity * sectors_per_frame);
1486        /* save a private copy of the TOC capacity for error handling */
1487        drive->probed_capacity = toc->capacity * sectors_per_frame;
1488
1489        blk_queue_hardsect_size(drive->queue,
1490                                sectors_per_frame << SECTOR_BITS);
1491
1492        /* first read just the header, so we know how long the TOC is */
1493        stat = cdrom_read_tocentry(drive, 0, 1, 0, (char *) &toc->hdr,
1494                                    sizeof(struct atapi_toc_header), sense);
1495        if (stat)
1496                return stat;
1497
1498        if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
1499                toc->hdr.first_track = bcd2bin(toc->hdr.first_track);
1500                toc->hdr.last_track  = bcd2bin(toc->hdr.last_track);
1501        }
1502
1503        ntracks = toc->hdr.last_track - toc->hdr.first_track + 1;
1504        if (ntracks <= 0)
1505                return -EIO;
1506        if (ntracks > MAX_TRACKS)
1507                ntracks = MAX_TRACKS;
1508
1509        /* now read the whole schmeer */
1510        stat = cdrom_read_tocentry(drive, toc->hdr.first_track, 1, 0,
1511                                  (char *)&toc->hdr,
1512                                   sizeof(struct atapi_toc_header) +
1513                                   (ntracks + 1) *
1514                                   sizeof(struct atapi_toc_entry), sense);
1515
1516        if (stat && toc->hdr.first_track > 1) {
1517                /*
1518                 * Cds with CDI tracks only don't have any TOC entries, despite
1519                 * of this the returned values are
1520                 * first_track == last_track = number of CDI tracks + 1,
1521                 * so that this case is indistinguishable from the same layout
1522                 * plus an additional audio track. If we get an error for the
1523                 * regular case, we assume a CDI without additional audio
1524                 * tracks. In this case the readable TOC is empty (CDI tracks
1525                 * are not included) and only holds the Leadout entry.
1526                 *
1527                 * Heiko Ei\xC3\x9Ffeldt.
1528                 */
1529                ntracks = 0;
1530                stat = cdrom_read_tocentry(drive, CDROM_LEADOUT, 1, 0,
1531                                           (char *)&toc->hdr,
1532                                           sizeof(struct atapi_toc_header) +
1533                                           (ntracks + 1) *
1534                                           sizeof(struct atapi_toc_entry),
1535                                           sense);
1536                if (stat)
1537                        return stat;
1538
1539                if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
1540                        toc->hdr.first_track = (u8)bin2bcd(CDROM_LEADOUT);
1541                        toc->hdr.last_track = (u8)bin2bcd(CDROM_LEADOUT);
1542                } else {
1543                        toc->hdr.first_track = CDROM_LEADOUT;
1544                        toc->hdr.last_track = CDROM_LEADOUT;
1545                }
1546        }
1547
1548        if (stat)
1549                return stat;
1550
1551        toc->hdr.toc_length = be16_to_cpu(toc->hdr.toc_length);
1552
1553        if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
1554                toc->hdr.first_track = bcd2bin(toc->hdr.first_track);
1555                toc->hdr.last_track  = bcd2bin(toc->hdr.last_track);
1556        }
1557
1558        for (i = 0; i <= ntracks; i++) {
1559                if (drive->atapi_flags & IDE_AFLAG_TOCADDR_AS_BCD) {
1560                        if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD)
1561                                toc->ent[i].track = bcd2bin(toc->ent[i].track);
1562                        msf_from_bcd(&toc->ent[i].addr.msf);
1563                }
1564                toc->ent[i].addr.lba = msf_to_lba(toc->ent[i].addr.msf.minute,
1565                                                  toc->ent[i].addr.msf.second,
1566                                                  toc->ent[i].addr.msf.frame);
1567        }
1568
1569        if (toc->hdr.first_track != CDROM_LEADOUT) {
1570                /* read the multisession information */
1571                stat = cdrom_read_tocentry(drive, 0, 0, 1, (char *)&ms_tmp,
1572                                           sizeof(ms_tmp), sense);
1573                if (stat)
1574                        return stat;
1575
1576                toc->last_session_lba = be32_to_cpu(ms_tmp.ent.addr.lba);
1577        } else {
1578                ms_tmp.hdr.last_track = CDROM_LEADOUT;
1579                ms_tmp.hdr.first_track = ms_tmp.hdr.last_track;
1580                toc->last_session_lba = msf_to_lba(0, 2, 0); /* 0m 2s 0f */
1581        }
1582
1583        if (drive->atapi_flags & IDE_AFLAG_TOCADDR_AS_BCD) {
1584                /* re-read multisession information using MSF format */
1585                stat = cdrom_read_tocentry(drive, 0, 1, 1, (char *)&ms_tmp,
1586                                           sizeof(ms_tmp), sense);
1587                if (stat)
1588                        return stat;
1589
1590                msf_from_bcd(&ms_tmp.ent.addr.msf);
1591                toc->last_session_lba = msf_to_lba(ms_tmp.ent.addr.msf.minute,
1592                                                   ms_tmp.ent.addr.msf.second,
1593                                                   ms_tmp.ent.addr.msf.frame);
1594        }
1595
1596        toc->xa_flag = (ms_tmp.hdr.first_track != ms_tmp.hdr.last_track);
1597
1598        /* now try to get the total cdrom capacity */
1599        stat = cdrom_get_last_written(cdi, &last_written);
1600        if (!stat && (last_written > toc->capacity)) {
1601                toc->capacity = last_written;
1602                set_capacity(info->disk, toc->capacity * sectors_per_frame);
1603                drive->probed_capacity = toc->capacity * sectors_per_frame;
1604        }
1605
1606        /* Remember that we've read this stuff. */
1607        drive->atapi_flags |= IDE_AFLAG_TOC_VALID;
1608
1609        return 0;
1610}
1611
1612int ide_cdrom_get_capabilities(ide_drive_t *drive, u8 *buf)
1613{
1614        struct cdrom_info *info = drive->driver_data;
1615        struct cdrom_device_info *cdi = &info->devinfo;
1616        struct packet_command cgc;
1617        int stat, attempts = 3, size = ATAPI_CAPABILITIES_PAGE_SIZE;
1618
1619        ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
1620
1621        if ((drive->atapi_flags & IDE_AFLAG_FULL_CAPS_PAGE) == 0)
1622                size -= ATAPI_CAPABILITIES_PAGE_PAD_SIZE;
1623
1624        init_cdrom_command(&cgc, buf, size, CGC_DATA_UNKNOWN);
1625        do {
1626                /* we seem to get stat=0x01,err=0x00 the first time (??) */
1627                stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1628                if (!stat)
1629                        break;
1630        } while (--attempts);
1631        return stat;
1632}
1633
1634void ide_cdrom_update_speed(ide_drive_t *drive, u8 *buf)
1635{
1636        struct cdrom_info *cd = drive->driver_data;
1637        u16 curspeed, maxspeed;
1638
1639        ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
1640
1641        if (drive->atapi_flags & IDE_AFLAG_LE_SPEED_FIELDS) {
1642                curspeed = le16_to_cpup((__le16 *)&buf[8 + 14]);
1643                maxspeed = le16_to_cpup((__le16 *)&buf[8 + 8]);
1644        } else {
1645                curspeed = be16_to_cpup((__be16 *)&buf[8 + 14]);
1646                maxspeed = be16_to_cpup((__be16 *)&buf[8 + 8]);
1647        }
1648
1649        ide_debug_log(IDE_DBG_PROBE, "%s: curspeed: %u, maxspeed: %u\n",
1650                      __func__, curspeed, maxspeed);
1651
1652        cd->current_speed = (curspeed + (176/2)) / 176;
1653        cd->max_speed = (maxspeed + (176/2)) / 176;
1654}
1655
1656#define IDE_CD_CAPABILITIES \
1657        (CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK | CDC_SELECT_SPEED | \
1658         CDC_SELECT_DISC | CDC_MULTI_SESSION | CDC_MCN | CDC_MEDIA_CHANGED | \
1659         CDC_PLAY_AUDIO | CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R | \
1660         CDC_CD_RW | CDC_DVD | CDC_DVD_R | CDC_DVD_RAM | CDC_GENERIC_PACKET | \
1661         CDC_MO_DRIVE | CDC_MRW | CDC_MRW_W | CDC_RAM)
1662
1663static struct cdrom_device_ops ide_cdrom_dops = {
1664        .open                   = ide_cdrom_open_real,
1665        .release                = ide_cdrom_release_real,
1666        .drive_status           = ide_cdrom_drive_status,
1667        .media_changed          = ide_cdrom_check_media_change_real,
1668        .tray_move              = ide_cdrom_tray_move,
1669        .lock_door              = ide_cdrom_lock_door,
1670        .select_speed           = ide_cdrom_select_speed,
1671        .get_last_session       = ide_cdrom_get_last_session,
1672        .get_mcn                = ide_cdrom_get_mcn,
1673        .reset                  = ide_cdrom_reset,
1674        .audio_ioctl            = ide_cdrom_audio_ioctl,
1675        .capability             = IDE_CD_CAPABILITIES,
1676        .generic_packet         = ide_cdrom_packet,
1677};
1678
1679static int ide_cdrom_register(ide_drive_t *drive, int nslots)
1680{
1681        struct cdrom_info *info = drive->driver_data;
1682        struct cdrom_device_info *devinfo = &info->devinfo;
1683
1684        ide_debug_log(IDE_DBG_PROBE, "Call %s, nslots: %d\n", __func__, nslots);
1685
1686        devinfo->ops = &ide_cdrom_dops;
1687        devinfo->speed = info->current_speed;
1688        devinfo->capacity = nslots;
1689        devinfo->handle = drive;
1690        strcpy(devinfo->name, drive->name);
1691
1692        if (drive->atapi_flags & IDE_AFLAG_NO_SPEED_SELECT)
1693                devinfo->mask |= CDC_SELECT_SPEED;
1694
1695        devinfo->disk = info->disk;
1696        return register_cdrom(devinfo);
1697}
1698
1699static int ide_cdrom_probe_capabilities(ide_drive_t *drive)
1700{
1701        struct cdrom_info *cd = drive->driver_data;
1702        struct cdrom_device_info *cdi = &cd->devinfo;
1703        u8 buf[ATAPI_CAPABILITIES_PAGE_SIZE];
1704        mechtype_t mechtype;
1705        int nslots = 1;
1706
1707        ide_debug_log(IDE_DBG_PROBE, "Call %s, drive->media: 0x%x, "
1708                      "drive->atapi_flags: 0x%lx\n", __func__, drive->media,
1709                      drive->atapi_flags);
1710
1711        cdi->mask = (CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R |
1712                     CDC_DVD_RAM | CDC_SELECT_DISC | CDC_PLAY_AUDIO |
1713                     CDC_MO_DRIVE | CDC_RAM);
1714
1715        if (drive->media == ide_optical) {
1716                cdi->mask &= ~(CDC_MO_DRIVE | CDC_RAM);
1717                printk(KERN_ERR PFX "%s: ATAPI magneto-optical drive\n",
1718                                drive->name);
1719                return nslots;
1720        }
1721
1722        if (drive->atapi_flags & IDE_AFLAG_PRE_ATAPI12) {
1723                drive->atapi_flags &= ~IDE_AFLAG_NO_EJECT;
1724                cdi->mask &= ~CDC_PLAY_AUDIO;
1725                return nslots;
1726        }
1727
1728        /*
1729         * We have to cheat a little here. the packet will eventually be queued
1730         * with ide_cdrom_packet(), which extracts the drive from cdi->handle.
1731         * Since this device hasn't been registered with the Uniform layer yet,
1732         * it can't do this. Same goes for cdi->ops.
1733         */
1734        cdi->handle = drive;
1735        cdi->ops = &ide_cdrom_dops;
1736
1737        if (ide_cdrom_get_capabilities(drive, buf))
1738                return 0;
1739
1740        if ((buf[8 + 6] & 0x01) == 0)
1741                drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
1742        if (buf[8 + 6] & 0x08)
1743                drive->atapi_flags &= ~IDE_AFLAG_NO_EJECT;
1744        if (buf[8 + 3] & 0x01)
1745                cdi->mask &= ~CDC_CD_R;
1746        if (buf[8 + 3] & 0x02)
1747                cdi->mask &= ~(CDC_CD_RW | CDC_RAM);
1748        if (buf[8 + 2] & 0x38)
1749                cdi->mask &= ~CDC_DVD;
1750        if (buf[8 + 3] & 0x20)
1751                cdi->mask &= ~(CDC_DVD_RAM | CDC_RAM);
1752        if (buf[8 + 3] & 0x10)
1753                cdi->mask &= ~CDC_DVD_R;
1754        if ((buf[8 + 4] & 0x01) || (drive->atapi_flags & IDE_AFLAG_PLAY_AUDIO_OK))
1755                cdi->mask &= ~CDC_PLAY_AUDIO;
1756
1757        mechtype = buf[8 + 6] >> 5;
1758        if (mechtype == mechtype_caddy ||
1759            mechtype == mechtype_popup ||
1760            (drive->atapi_flags & IDE_AFLAG_NO_AUTOCLOSE))
1761                cdi->mask |= CDC_CLOSE_TRAY;
1762
1763        if (cdi->sanyo_slot > 0) {
1764                cdi->mask &= ~CDC_SELECT_DISC;
1765                nslots = 3;
1766        } else if (mechtype == mechtype_individual_changer ||
1767                   mechtype == mechtype_cartridge_changer) {
1768                nslots = cdrom_number_of_slots(cdi);
1769                if (nslots > 1)
1770                        cdi->mask &= ~CDC_SELECT_DISC;
1771        }
1772
1773        ide_cdrom_update_speed(drive, buf);
1774
1775        printk(KERN_INFO PFX "%s: ATAPI", drive->name);
1776
1777        /* don't print speed if the drive reported 0 */
1778        if (cd->max_speed)
1779                printk(KERN_CONT " %dX", cd->max_speed);
1780
1781        printk(KERN_CONT " %s", (cdi->mask & CDC_DVD) ? "CD-ROM" : "DVD-ROM");
1782
1783        if ((cdi->mask & CDC_DVD_R) == 0 || (cdi->mask & CDC_DVD_RAM) == 0)
1784                printk(KERN_CONT " DVD%s%s",
1785                                 (cdi->mask & CDC_DVD_R) ? "" : "-R",
1786                                 (cdi->mask & CDC_DVD_RAM) ? "" : "/RAM");
1787
1788        if ((cdi->mask & CDC_CD_R) == 0 || (cdi->mask & CDC_CD_RW) == 0)
1789                printk(KERN_CONT " CD%s%s",
1790                                 (cdi->mask & CDC_CD_R) ? "" : "-R",
1791                                 (cdi->mask & CDC_CD_RW) ? "" : "/RW");
1792
1793        if ((cdi->mask & CDC_SELECT_DISC) == 0)
1794                printk(KERN_CONT " changer w/%d slots", nslots);
1795        else
1796                printk(KERN_CONT " drive");
1797
1798        printk(KERN_CONT ", %dkB Cache\n",
1799                         be16_to_cpup((__be16 *)&buf[8 + 12]));
1800
1801        return nslots;
1802}
1803
1804/* standard prep_rq_fn that builds 10 byte cmds */
1805static int ide_cdrom_prep_fs(struct request_queue *q, struct request *rq)
1806{
1807        int hard_sect = queue_hardsect_size(q);
1808        long block = (long)rq->hard_sector / (hard_sect >> 9);
1809        unsigned long blocks = rq->hard_nr_sectors / (hard_sect >> 9);
1810
1811        memset(rq->cmd, 0, BLK_MAX_CDB);
1812
1813        if (rq_data_dir(rq) == READ)
1814                rq->cmd[0] = GPCMD_READ_10;
1815        else
1816                rq->cmd[0] = GPCMD_WRITE_10;
1817
1818        /*
1819         * fill in lba
1820         */
1821        rq->cmd[2] = (block >> 24) & 0xff;
1822        rq->cmd[3] = (block >> 16) & 0xff;
1823        rq->cmd[4] = (block >>  8) & 0xff;
1824        rq->cmd[5] = block & 0xff;
1825
1826        /*
1827         * and transfer length
1828         */
1829        rq->cmd[7] = (blocks >> 8) & 0xff;
1830        rq->cmd[8] = blocks & 0xff;
1831        rq->cmd_len = 10;
1832        return BLKPREP_OK;
1833}
1834
1835/*
1836 * Most of the SCSI commands are supported directly by ATAPI devices.
1837 * This transform handles the few exceptions.
1838 */
1839static int ide_cdrom_prep_pc(struct request *rq)
1840{
1841        u8 *c = rq->cmd;
1842
1843        /* transform 6-byte read/write commands to the 10-byte version */
1844        if (c[0] == READ_6 || c[0] == WRITE_6) {
1845                c[8] = c[4];
1846                c[5] = c[3];
1847                c[4] = c[2];
1848                c[3] = c[1] & 0x1f;
1849                c[2] = 0;
1850                c[1] &= 0xe0;
1851                c[0] += (READ_10 - READ_6);
1852                rq->cmd_len = 10;
1853                return BLKPREP_OK;
1854        }
1855
1856        /*
1857         * it's silly to pretend we understand 6-byte sense commands, just
1858         * reject with ILLEGAL_REQUEST and the caller should take the
1859         * appropriate action
1860         */
1861        if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
1862                rq->errors = ILLEGAL_REQUEST;
1863                return BLKPREP_KILL;
1864        }
1865
1866        return BLKPREP_OK;
1867}
1868
1869static int ide_cdrom_prep_fn(struct request_queue *q, struct request *rq)
1870{
1871        if (blk_fs_request(rq))
1872                return ide_cdrom_prep_fs(q, rq);
1873        else if (blk_pc_request(rq))
1874                return ide_cdrom_prep_pc(rq);
1875
1876        return 0;
1877}
1878
1879struct cd_list_entry {
1880        const char      *id_model;
1881        const char      *id_firmware;
1882        unsigned int    cd_flags;
1883};
1884
1885#ifdef CONFIG_IDE_PROC_FS
1886static sector_t ide_cdrom_capacity(ide_drive_t *drive)
1887{
1888        unsigned long capacity, sectors_per_frame;
1889
1890        if (cdrom_read_capacity(drive, &capacity, &sectors_per_frame, NULL))
1891                return 0;
1892
1893        return capacity * sectors_per_frame;
1894}
1895
1896static int proc_idecd_read_capacity(char *page, char **start, off_t off,
1897                                        int count, int *eof, void *data)
1898{
1899        ide_drive_t *drive = data;
1900        int len;
1901
1902        len = sprintf(page, "%llu\n", (long long)ide_cdrom_capacity(drive));
1903        PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
1904}
1905
1906static ide_proc_entry_t idecd_proc[] = {
1907        { "capacity", S_IFREG|S_IRUGO, proc_idecd_read_capacity, NULL },
1908        { NULL, 0, NULL, NULL }
1909};
1910
1911ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP);
1912
1913static const struct ide_proc_devset idecd_settings[] = {
1914        IDE_PROC_DEVSET(dsc_overlap, 0, 1),
1915        { 0 },
1916};
1917
1918static ide_proc_entry_t *ide_cd_proc_entries(ide_drive_t *drive)
1919{
1920        return idecd_proc;
1921}
1922
1923static const struct ide_proc_devset *ide_cd_proc_devsets(ide_drive_t *drive)
1924{
1925        return idecd_settings;
1926}
1927#endif
1928
1929static const struct cd_list_entry ide_cd_quirks_list[] = {
1930        /* Limit transfer size per interrupt. */
1931        { "SAMSUNG CD-ROM SCR-2430", NULL,   IDE_AFLAG_LIMIT_NFRAMES         },
1932        { "SAMSUNG CD-ROM SCR-2432", NULL,   IDE_AFLAG_LIMIT_NFRAMES         },
1933        /* SCR-3231 doesn't support the SET_CD_SPEED command. */
1934        { "SAMSUNG CD-ROM SCR-3231", NULL,   IDE_AFLAG_NO_SPEED_SELECT       },
1935        /* Old NEC260 (not R) was released before ATAPI 1.2 spec. */
1936        { "NEC CD-ROM DRIVE:260",    "1.01", IDE_AFLAG_TOCADDR_AS_BCD |
1937                                             IDE_AFLAG_PRE_ATAPI12,          },
1938        /* Vertos 300, some versions of this drive like to talk BCD. */
1939        { "V003S0DS",                NULL,   IDE_AFLAG_VERTOS_300_SSD,       },
1940        /* Vertos 600 ESD. */
1941        { "V006E0DS",                NULL,   IDE_AFLAG_VERTOS_600_ESD,       },
1942        /*
1943         * Sanyo 3 CD changer uses a non-standard command for CD changing
1944         * (by default standard ATAPI support for CD changers is used).
1945         */
1946        { "CD-ROM CDR-C3 G",         NULL,   IDE_AFLAG_SANYO_3CD             },
1947        { "CD-ROM CDR-C3G",          NULL,   IDE_AFLAG_SANYO_3CD             },
1948        { "CD-ROM CDR_C36",          NULL,   IDE_AFLAG_SANYO_3CD             },
1949        /* Stingray 8X CD-ROM. */
1950        { "STINGRAY 8422 IDE 8X CD-ROM 7-27-95", NULL, IDE_AFLAG_PRE_ATAPI12 },
1951        /*
1952         * ACER 50X CD-ROM and WPI 32X CD-ROM require the full spec length
1953         * mode sense page capabilities size, but older drives break.
1954         */
1955        { "ATAPI CD ROM DRIVE 50X MAX", NULL,   IDE_AFLAG_FULL_CAPS_PAGE     },
1956        { "WPI CDS-32X",                NULL,   IDE_AFLAG_FULL_CAPS_PAGE     },
1957        /* ACER/AOpen 24X CD-ROM has the speed fields byte-swapped. */
1958        { "",                        "241N", IDE_AFLAG_LE_SPEED_FIELDS       },
1959        /*
1960         * Some drives used by Apple don't advertise audio play
1961         * but they do support reading TOC & audio datas.
1962         */
1963        { "MATSHITADVD-ROM SR-8187", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1964        { "MATSHITADVD-ROM SR-8186", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1965        { "MATSHITADVD-ROM SR-8176", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1966        { "MATSHITADVD-ROM SR-8174", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1967        { "Optiarc DVD RW AD-5200A", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1968        { "Optiarc DVD RW AD-7200A", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1969        { "Optiarc DVD RW AD-7543A", NULL,   IDE_AFLAG_NO_AUTOCLOSE          },
1970        { "TEAC CD-ROM CD-224E",     NULL,   IDE_AFLAG_NO_AUTOCLOSE          },
1971        { NULL, NULL, 0 }
1972};
1973
1974static unsigned int ide_cd_flags(u16 *id)
1975{
1976        const struct cd_list_entry *cle = ide_cd_quirks_list;
1977
1978        while (cle->id_model) {
1979                if (strcmp(cle->id_model, (char *)&id[ATA_ID_PROD]) == 0 &&
1980                    (cle->id_firmware == NULL ||
1981                     strstr((char *)&id[ATA_ID_FW_REV], cle->id_firmware)))
1982                        return cle->cd_flags;
1983                cle++;
1984        }
1985
1986        return 0;
1987}
1988
1989static int ide_cdrom_setup(ide_drive_t *drive)
1990{
1991        struct cdrom_info *cd = drive->driver_data;
1992        struct cdrom_device_info *cdi = &cd->devinfo;
1993        u16 *id = drive->id;
1994        char *fw_rev = (char *)&id[ATA_ID_FW_REV];
1995        int nslots;
1996
1997        ide_debug_log(IDE_DBG_PROBE, "Call %s\n", __func__);
1998
1999        blk_queue_prep_rq(drive->queue, ide_cdrom_prep_fn);
2000        blk_queue_dma_alignment(drive->queue, 31);
2001        blk_queue_update_dma_pad(drive->queue, 15);
2002        drive->queue->unplug_delay = (1 * HZ) / 1000;
2003        if (!drive->queue->unplug_delay)
2004                drive->queue->unplug_delay = 1;
2005
2006        drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;
2007        drive->atapi_flags = IDE_AFLAG_NO_EJECT | ide_cd_flags(id);
2008
2009        if ((drive->atapi_flags & IDE_AFLAG_VERTOS_300_SSD) &&
2010            fw_rev[4] == '1' && fw_rev[6] <= '2')
2011                drive->atapi_flags |= (IDE_AFLAG_TOCTRACKS_AS_BCD |
2012                                     IDE_AFLAG_TOCADDR_AS_BCD);
2013        else if ((drive->atapi_flags & IDE_AFLAG_VERTOS_600_ESD) &&
2014                 fw_rev[4] == '1' && fw_rev[6] <= '2')
2015                drive->atapi_flags |= IDE_AFLAG_TOCTRACKS_AS_BCD;
2016        else if (drive->atapi_flags & IDE_AFLAG_SANYO_3CD)
2017                /* 3 => use CD in slot 0 */
2018                cdi->sanyo_slot = 3;
2019
2020        nslots = ide_cdrom_probe_capabilities(drive);
2021
2022        /* set correct block size */
2023        blk_queue_hardsect_size(drive->queue, CD_FRAMESIZE);
2024
2025        if (drive->next != drive)
2026                drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP;
2027        else
2028                drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
2029
2030        if (ide_cdrom_register(drive, nslots)) {
2031                printk(KERN_ERR PFX "%s: %s failed to register device with the"
2032                                " cdrom driver.\n", drive->name, __func__);
2033                cd->devinfo.handle = NULL;
2034                return 1;
2035        }
2036
2037        ide_proc_register_driver(drive, cd->driver);
2038        return 0;
2039}
2040
2041static void ide_cd_remove(ide_drive_t *drive)
2042{
2043        struct cdrom_info *info = drive->driver_data;
2044
2045        ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
2046
2047        ide_proc_unregister_driver(drive, info->driver);
2048
2049        del_gendisk(info->disk);
2050
2051        ide_cd_put(info);
2052}
2053
2054static void ide_cd_release(struct kref *kref)
2055{
2056        struct cdrom_info *info = to_ide_drv(kref, cdrom_info);
2057        struct cdrom_device_info *devinfo = &info->devinfo;
2058        ide_drive_t *drive = info->drive;
2059        struct gendisk *g = info->disk;
2060
2061        ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
2062
2063        kfree(info->toc);
2064        if (devinfo->handle == drive)
2065                unregister_cdrom(devinfo);
2066        drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
2067        drive->driver_data = NULL;
2068        blk_queue_prep_rq(drive->queue, NULL);
2069        g->private_data = NULL;
2070        put_disk(g);
2071        kfree(info);
2072}
2073
2074static int ide_cd_probe(ide_drive_t *);
2075
2076static ide_driver_t ide_cdrom_driver = {
2077        .gen_driver = {
2078                .owner          = THIS_MODULE,
2079                .name           = "ide-cdrom",
2080                .bus            = &ide_bus_type,
2081        },
2082        .probe                  = ide_cd_probe,
2083        .remove                 = ide_cd_remove,
2084        .version                = IDECD_VERSION,
2085        .do_request             = ide_cd_do_request,
2086        .end_request            = ide_end_request,
2087        .error                  = __ide_error,
2088#ifdef CONFIG_IDE_PROC_FS
2089        .proc_entries           = ide_cd_proc_entries,
2090        .proc_devsets           = ide_cd_proc_devsets,
2091#endif
2092};
2093
2094static int idecd_open(struct block_device *bdev, fmode_t mode)
2095{
2096        struct cdrom_info *info = ide_cd_get(bdev->bd_disk);
2097        int rc = -ENOMEM;
2098
2099        if (!info)
2100                return -ENXIO;
2101
2102        rc = cdrom_open(&info->devinfo, bdev, mode);
2103
2104        if (rc < 0)
2105                ide_cd_put(info);
2106
2107        return rc;
2108}
2109
2110static int idecd_release(struct gendisk *disk, fmode_t mode)
2111{
2112        struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
2113
2114        cdrom_release(&info->devinfo, mode);
2115
2116        ide_cd_put(info);
2117
2118        return 0;
2119}
2120
2121static int idecd_set_spindown(struct cdrom_device_info *cdi, unsigned long arg)
2122{
2123        struct packet_command cgc;
2124        char buffer[16];
2125        int stat;
2126        char spindown;
2127
2128        if (copy_from_user(&spindown, (void __user *)arg, sizeof(char)))
2129                return -EFAULT;
2130
2131        init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_UNKNOWN);
2132
2133        stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CDROM_PAGE, 0);
2134        if (stat)
2135                return stat;
2136
2137        buffer[11] = (buffer[11] & 0xf0) | (spindown & 0x0f);
2138        return cdrom_mode_select(cdi, &cgc);
2139}
2140
2141static int idecd_get_spindown(struct cdrom_device_info *cdi, unsigned long arg)
2142{
2143        struct packet_command cgc;
2144        char buffer[16];
2145        int stat;
2146        char spindown;
2147
2148        init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_UNKNOWN);
2149
2150        stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CDROM_PAGE, 0);
2151        if (stat)
2152                return stat;
2153
2154        spindown = buffer[11] & 0x0f;
2155        if (copy_to_user((void __user *)arg, &spindown, sizeof(char)))
2156                return -EFAULT;
2157        return 0;
2158}
2159
2160static int idecd_ioctl(struct block_device *bdev, fmode_t mode,
2161                        unsigned int cmd, unsigned long arg)
2162{
2163        struct cdrom_info *info = ide_drv_g(bdev->bd_disk, cdrom_info);
2164        int err;
2165
2166        switch (cmd) {
2167        case CDROMSETSPINDOWN:
2168                return idecd_set_spindown(&info->devinfo, arg);
2169        case CDROMGETSPINDOWN:
2170                return idecd_get_spindown(&info->devinfo, arg);
2171        default:
2172                break;
2173        }
2174
2175        err = generic_ide_ioctl(info->drive, bdev, cmd, arg);
2176        if (err == -EINVAL)
2177                err = cdrom_ioctl(&info->devinfo, bdev, mode, cmd, arg);
2178
2179        return err;
2180}
2181
2182static int idecd_media_changed(struct gendisk *disk)
2183{
2184        struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
2185        return cdrom_media_changed(&info->devinfo);
2186}
2187
2188static int idecd_revalidate_disk(struct gendisk *disk)
2189{
2190        struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
2191        struct request_sense sense;
2192
2193        ide_cd_read_toc(info->drive, &sense);
2194
2195        return  0;
2196}
2197
2198static struct block_device_operations idecd_ops = {
2199        .owner                  = THIS_MODULE,
2200        .open                   = idecd_open,
2201        .release                = idecd_release,
2202        .locked_ioctl           = idecd_ioctl,
2203        .media_changed          = idecd_media_changed,
2204        .revalidate_disk        = idecd_revalidate_disk
2205};
2206
2207/* module options */
2208static char *ignore;
2209module_param(ignore, charp, 0400);
2210
2211static unsigned long debug_mask;
2212module_param(debug_mask, ulong, 0644);
2213
2214MODULE_DESCRIPTION("ATAPI CD-ROM Driver");
2215
2216static int ide_cd_probe(ide_drive_t *drive)
2217{
2218        struct cdrom_info *info;
2219        struct gendisk *g;
2220        struct request_sense sense;
2221
2222        ide_debug_log(IDE_DBG_PROBE, "Call %s, drive->driver_req: %s, "
2223                      "drive->media: 0x%x\n", __func__, drive->driver_req,
2224                      drive->media);
2225
2226        if (!strstr("ide-cdrom", drive->driver_req))
2227                goto failed;
2228
2229        if (drive->media != ide_cdrom && drive->media != ide_optical)
2230                goto failed;
2231
2232        /* skip drives that we were told to ignore */
2233        if (ignore != NULL) {
2234                if (strstr(ignore, drive->name)) {
2235                        printk(KERN_INFO PFX "ignoring drive %s\n",
2236                                         drive->name);
2237                        goto failed;
2238                }
2239        }
2240
2241        drive->debug_mask = debug_mask;
2242
2243        info = kzalloc(sizeof(struct cdrom_info), GFP_KERNEL);
2244        if (info == NULL) {
2245                printk(KERN_ERR PFX "%s: Can't allocate a cdrom structure\n",
2246                                drive->name);
2247                goto failed;
2248        }
2249
2250        g = alloc_disk(1 << PARTN_BITS);
2251        if (!g)
2252                goto out_free_cd;
2253
2254        ide_init_disk(g, drive);
2255
2256        kref_init(&info->kref);
2257
2258        info->drive = drive;
2259        info->driver = &ide_cdrom_driver;
2260        info->disk = g;
2261
2262        g->private_data = &info->driver;
2263
2264        drive->driver_data = info;
2265
2266        g->minors = 1;
2267        g->driverfs_dev = &drive->gendev;
2268        g->flags = GENHD_FL_CD | GENHD_FL_REMOVABLE;
2269        if (ide_cdrom_setup(drive)) {
2270                ide_cd_release(&info->kref);
2271                goto failed;
2272        }
2273
2274        ide_cd_read_toc(drive, &sense);
2275        g->fops = &idecd_ops;
2276        g->flags |= GENHD_FL_REMOVABLE;
2277        add_disk(g);
2278        return 0;
2279
2280out_free_cd:
2281        kfree(info);
2282failed:
2283        return -ENODEV;
2284}
2285
2286static void __exit ide_cdrom_exit(void)
2287{
2288        driver_unregister(&ide_cdrom_driver.gen_driver);
2289}
2290
2291static int __init ide_cdrom_init(void)
2292{
2293        printk(KERN_INFO DRV_NAME " driver " IDECD_VERSION "\n");
2294        return driver_register(&ide_cdrom_driver.gen_driver);
2295}
2296
2297MODULE_ALIAS("ide:*m-cdrom*");
2298MODULE_ALIAS("ide-cd");
2299module_init(ide_cdrom_init);
2300module_exit(ide_cdrom_exit);
2301MODULE_LICENSE("GPL");
2302