ide: fix regression caused by ide_device_{get,put}() addition (take 2)
[linux-2.6.git] / drivers / ide / ide-cd.c
1 /*
2  * ATAPI CD-ROM driver.
3  *
4  * Copyright (C) 1994-1996   Scott Snyder <snyder@fnald0.fnal.gov>
5  * Copyright (C) 1996-1998   Erik Andersen <andersee@debian.org>
6  * Copyright (C) 1998-2000   Jens Axboe <axboe@suse.de>
7  * Copyright (C) 2005, 2007  Bartlomiej Zolnierkiewicz
8  *
9  * May be copied or modified under the terms of the GNU General Public
10  * License.  See linux/COPYING for more information.
11  *
12  * See Documentation/cdrom/ide-cd for usage information.
13  *
14  * Suggestions are welcome. Patches that work are more welcome though. ;-)
15  * For those wishing to work on this driver, please be sure you download
16  * and comply with the latest Mt. Fuji (SFF8090 version 4) and ATAPI
17  * (SFF-8020i rev 2.6) standards. These documents can be obtained by
18  * anonymous ftp from:
19  * ftp://fission.dt.wdc.com/pub/standards/SFF_atapi/spec/SFF8020-r2.6/PS/8020r26.ps
20  * ftp://ftp.avc-pioneer.com/Mtfuji4/Spec/Fuji4r10.pdf
21  *
22  * For historical changelog please see:
23  *      Documentation/ide/ChangeLog.ide-cd.1994-2004
24  */
25
26 #define IDECD_VERSION "5.00"
27
28 #include <linux/module.h>
29 #include <linux/types.h>
30 #include <linux/kernel.h>
31 #include <linux/delay.h>
32 #include <linux/timer.h>
33 #include <linux/slab.h>
34 #include <linux/interrupt.h>
35 #include <linux/errno.h>
36 #include <linux/cdrom.h>
37 #include <linux/ide.h>
38 #include <linux/completion.h>
39 #include <linux/mutex.h>
40 #include <linux/bcd.h>
41
42 /* For SCSI -> ATAPI command conversion */
43 #include <scsi/scsi.h>
44
45 #include <linux/irq.h>
46 #include <linux/io.h>
47 #include <asm/byteorder.h>
48 #include <linux/uaccess.h>
49 #include <asm/unaligned.h>
50
51 #include "ide-cd.h"
52
53 static DEFINE_MUTEX(idecd_ref_mutex);
54
55 #define to_ide_cd(obj) container_of(obj, struct cdrom_info, kref)
56
57 #define ide_cd_g(disk) \
58         container_of((disk)->private_data, struct cdrom_info, driver)
59
60 static void ide_cd_release(struct kref *);
61
62 static struct cdrom_info *ide_cd_get(struct gendisk *disk)
63 {
64         struct cdrom_info *cd = NULL;
65
66         mutex_lock(&idecd_ref_mutex);
67         cd = ide_cd_g(disk);
68         if (cd) {
69                 if (ide_device_get(cd->drive))
70                         cd = NULL;
71                 else
72                         kref_get(&cd->kref);
73
74         }
75         mutex_unlock(&idecd_ref_mutex);
76         return cd;
77 }
78
79 static void ide_cd_put(struct cdrom_info *cd)
80 {
81         ide_drive_t *drive = cd->drive;
82
83         mutex_lock(&idecd_ref_mutex);
84         kref_put(&cd->kref, ide_cd_release);
85         ide_device_put(drive);
86         mutex_unlock(&idecd_ref_mutex);
87 }
88
89 /*
90  * Generic packet command support and error handling routines.
91  */
92
93 /* Mark that we've seen a media change and invalidate our internal buffers. */
94 static void cdrom_saw_media_change(ide_drive_t *drive)
95 {
96         drive->atapi_flags |= IDE_AFLAG_MEDIA_CHANGED;
97         drive->atapi_flags &= ~IDE_AFLAG_TOC_VALID;
98 }
99
100 static int cdrom_log_sense(ide_drive_t *drive, struct request *rq,
101                            struct request_sense *sense)
102 {
103         int log = 0;
104
105         if (!sense || !rq || (rq->cmd_flags & REQ_QUIET))
106                 return 0;
107
108         switch (sense->sense_key) {
109         case NO_SENSE:
110         case RECOVERED_ERROR:
111                 break;
112         case NOT_READY:
113                 /*
114                  * don't care about tray state messages for e.g. capacity
115                  * commands or in-progress or becoming ready
116                  */
117                 if (sense->asc == 0x3a || sense->asc == 0x04)
118                         break;
119                 log = 1;
120                 break;
121         case ILLEGAL_REQUEST:
122                 /*
123                  * don't log START_STOP unit with LoEj set, since we cannot
124                  * reliably check if drive can auto-close
125                  */
126                 if (rq->cmd[0] == GPCMD_START_STOP_UNIT && sense->asc == 0x24)
127                         break;
128                 log = 1;
129                 break;
130         case UNIT_ATTENTION:
131                 /*
132                  * Make good and sure we've seen this potential media change.
133                  * Some drives (i.e. Creative) fail to present the correct sense
134                  * key in the error register.
135                  */
136                 cdrom_saw_media_change(drive);
137                 break;
138         default:
139                 log = 1;
140                 break;
141         }
142         return log;
143 }
144
145 static void cdrom_analyze_sense_data(ide_drive_t *drive,
146                               struct request *failed_command,
147                               struct request_sense *sense)
148 {
149         unsigned long sector;
150         unsigned long bio_sectors;
151         struct cdrom_info *info = drive->driver_data;
152
153         if (!cdrom_log_sense(drive, failed_command, sense))
154                 return;
155
156         /*
157          * If a read toc is executed for a CD-R or CD-RW medium where the first
158          * toc has not been recorded yet, it will fail with 05/24/00 (which is a
159          * confusing error)
160          */
161         if (failed_command && failed_command->cmd[0] == GPCMD_READ_TOC_PMA_ATIP)
162                 if (sense->sense_key == 0x05 && sense->asc == 0x24)
163                         return;
164
165         /* current error */
166         if (sense->error_code == 0x70) {
167                 switch (sense->sense_key) {
168                 case MEDIUM_ERROR:
169                 case VOLUME_OVERFLOW:
170                 case ILLEGAL_REQUEST:
171                         if (!sense->valid)
172                                 break;
173                         if (failed_command == NULL ||
174                                         !blk_fs_request(failed_command))
175                                 break;
176                         sector = (sense->information[0] << 24) |
177                                  (sense->information[1] << 16) |
178                                  (sense->information[2] <<  8) |
179                                  (sense->information[3]);
180
181                         if (drive->queue->hardsect_size == 2048)
182                                 /* device sector size is 2K */
183                                 sector <<= 2;
184
185                         bio_sectors = max(bio_sectors(failed_command->bio), 4U);
186                         sector &= ~(bio_sectors - 1);
187
188                         if (sector < get_capacity(info->disk) &&
189                             drive->probed_capacity - sector < 4 * 75)
190                                 set_capacity(info->disk, sector);
191                 }
192         }
193
194         ide_cd_log_error(drive->name, failed_command, sense);
195 }
196
197 static void cdrom_queue_request_sense(ide_drive_t *drive, void *sense,
198                                       struct request *failed_command)
199 {
200         struct cdrom_info *info         = drive->driver_data;
201         struct request *rq              = &info->request_sense_request;
202
203         if (sense == NULL)
204                 sense = &info->sense_data;
205
206         /* stuff the sense request in front of our current request */
207         blk_rq_init(NULL, rq);
208         rq->cmd_type = REQ_TYPE_ATA_PC;
209         rq->rq_disk = info->disk;
210
211         rq->data = sense;
212         rq->cmd[0] = GPCMD_REQUEST_SENSE;
213         rq->cmd[4] = 18;
214         rq->data_len = 18;
215
216         rq->cmd_type = REQ_TYPE_SENSE;
217         rq->cmd_flags |= REQ_PREEMPT;
218
219         /* NOTE! Save the failed command in "rq->buffer" */
220         rq->buffer = (void *) failed_command;
221
222         ide_do_drive_cmd(drive, rq);
223 }
224
225 static void cdrom_end_request(ide_drive_t *drive, int uptodate)
226 {
227         struct request *rq = HWGROUP(drive)->rq;
228         int nsectors = rq->hard_cur_sectors;
229
230         if (blk_sense_request(rq) && uptodate) {
231                 /*
232                  * For REQ_TYPE_SENSE, "rq->buffer" points to the original
233                  * failed request
234                  */
235                 struct request *failed = (struct request *) rq->buffer;
236                 struct cdrom_info *info = drive->driver_data;
237                 void *sense = &info->sense_data;
238                 unsigned long flags;
239
240                 if (failed) {
241                         if (failed->sense) {
242                                 sense = failed->sense;
243                                 failed->sense_len = rq->sense_len;
244                         }
245                         cdrom_analyze_sense_data(drive, failed, sense);
246                         /*
247                          * now end the failed request
248                          */
249                         if (blk_fs_request(failed)) {
250                                 if (ide_end_dequeued_request(drive, failed, 0,
251                                                 failed->hard_nr_sectors))
252                                         BUG();
253                         } else {
254                                 spin_lock_irqsave(&ide_lock, flags);
255                                 if (__blk_end_request(failed, -EIO,
256                                                       failed->data_len))
257                                         BUG();
258                                 spin_unlock_irqrestore(&ide_lock, flags);
259                         }
260                 } else
261                         cdrom_analyze_sense_data(drive, NULL, sense);
262         }
263
264         if (!rq->current_nr_sectors && blk_fs_request(rq))
265                 uptodate = 1;
266         /* make sure it's fully ended */
267         if (blk_pc_request(rq))
268                 nsectors = (rq->data_len + 511) >> 9;
269         if (!nsectors)
270                 nsectors = 1;
271
272         ide_end_request(drive, uptodate, nsectors);
273 }
274
275 static void ide_dump_status_no_sense(ide_drive_t *drive, const char *msg, u8 st)
276 {
277         if (st & 0x80)
278                 return;
279         ide_dump_status(drive, msg, st);
280 }
281
282 /*
283  * Returns:
284  * 0: if the request should be continued.
285  * 1: if the request was ended.
286  */
287 static int cdrom_decode_status(ide_drive_t *drive, int good_stat, int *stat_ret)
288 {
289         ide_hwif_t *hwif = drive->hwif;
290         struct request *rq = hwif->hwgroup->rq;
291         int stat, err, sense_key;
292
293         /* check for errors */
294         stat = hwif->tp_ops->read_status(hwif);
295
296         if (stat_ret)
297                 *stat_ret = stat;
298
299         if (OK_STAT(stat, good_stat, BAD_R_STAT))
300                 return 0;
301
302         /* get the IDE error register */
303         err = ide_read_error(drive);
304         sense_key = err >> 4;
305
306         if (rq == NULL) {
307                 printk(KERN_ERR "%s: missing rq in %s\n",
308                                 drive->name, __func__);
309                 return 1;
310         }
311
312         if (blk_sense_request(rq)) {
313                 /*
314                  * We got an error trying to get sense info from the drive
315                  * (probably while trying to recover from a former error).
316                  * Just give up.
317                  */
318                 rq->cmd_flags |= REQ_FAILED;
319                 cdrom_end_request(drive, 0);
320                 ide_error(drive, "request sense failure", stat);
321                 return 1;
322
323         } else if (blk_pc_request(rq) || rq->cmd_type == REQ_TYPE_ATA_PC) {
324                 /* All other functions, except for READ. */
325
326                 /*
327                  * if we have an error, pass back CHECK_CONDITION as the
328                  * scsi status byte
329                  */
330                 if (blk_pc_request(rq) && !rq->errors)
331                         rq->errors = SAM_STAT_CHECK_CONDITION;
332
333                 /* check for tray open */
334                 if (sense_key == NOT_READY) {
335                         cdrom_saw_media_change(drive);
336                 } else if (sense_key == UNIT_ATTENTION) {
337                         /* check for media change */
338                         cdrom_saw_media_change(drive);
339                         return 0;
340                 } else if (sense_key == ILLEGAL_REQUEST &&
341                            rq->cmd[0] == GPCMD_START_STOP_UNIT) {
342                         /*
343                          * Don't print error message for this condition--
344                          * SFF8090i indicates that 5/24/00 is the correct
345                          * response to a request to close the tray if the
346                          * drive doesn't have that capability.
347                          * cdrom_log_sense() knows this!
348                          */
349                 } else if (!(rq->cmd_flags & REQ_QUIET)) {
350                         /* otherwise, print an error */
351                         ide_dump_status(drive, "packet command error", stat);
352                 }
353
354                 rq->cmd_flags |= REQ_FAILED;
355
356                 /*
357                  * instead of playing games with moving completions around,
358                  * remove failed request completely and end it when the
359                  * request sense has completed
360                  */
361                 goto end_request;
362
363         } else if (blk_fs_request(rq)) {
364                 int do_end_request = 0;
365
366                 /* handle errors from READ and WRITE requests */
367
368                 if (blk_noretry_request(rq))
369                         do_end_request = 1;
370
371                 if (sense_key == NOT_READY) {
372                         /* tray open */
373                         if (rq_data_dir(rq) == READ) {
374                                 cdrom_saw_media_change(drive);
375
376                                 /* fail the request */
377                                 printk(KERN_ERR "%s: tray open\n", drive->name);
378                                 do_end_request = 1;
379                         } else {
380                                 struct cdrom_info *info = drive->driver_data;
381
382                                 /*
383                                  * Allow the drive 5 seconds to recover, some
384                                  * devices will return this error while flushing
385                                  * data from cache.
386                                  */
387                                 if (!rq->errors)
388                                         info->write_timeout = jiffies +
389                                                         ATAPI_WAIT_WRITE_BUSY;
390                                 rq->errors = 1;
391                                 if (time_after(jiffies, info->write_timeout))
392                                         do_end_request = 1;
393                                 else {
394                                         unsigned long flags;
395
396                                         /*
397                                          * take a breather relying on the unplug
398                                          * timer to kick us again
399                                          */
400                                         spin_lock_irqsave(&ide_lock, flags);
401                                         blk_plug_device(drive->queue);
402                                         spin_unlock_irqrestore(&ide_lock,
403                                                                 flags);
404                                         return 1;
405                                 }
406                         }
407                 } else if (sense_key == UNIT_ATTENTION) {
408                         /* media change */
409                         cdrom_saw_media_change(drive);
410
411                         /*
412                          * Arrange to retry the request but be sure to give up
413                          * if we've retried too many times.
414                          */
415                         if (++rq->errors > ERROR_MAX)
416                                 do_end_request = 1;
417                 } else if (sense_key == ILLEGAL_REQUEST ||
418                            sense_key == DATA_PROTECT) {
419                         /*
420                          * No point in retrying after an illegal request or data
421                          * protect error.
422                          */
423                         ide_dump_status_no_sense(drive, "command error", stat);
424                         do_end_request = 1;
425                 } else if (sense_key == MEDIUM_ERROR) {
426                         /*
427                          * No point in re-trying a zillion times on a bad
428                          * sector. If we got here the error is not correctable.
429                          */
430                         ide_dump_status_no_sense(drive,
431                                                  "media error (bad sector)",
432                                                  stat);
433                         do_end_request = 1;
434                 } else if (sense_key == BLANK_CHECK) {
435                         /* disk appears blank ?? */
436                         ide_dump_status_no_sense(drive, "media error (blank)",
437                                                  stat);
438                         do_end_request = 1;
439                 } else if ((err & ~ABRT_ERR) != 0) {
440                         /* go to the default handler for other errors */
441                         ide_error(drive, "cdrom_decode_status", stat);
442                         return 1;
443                 } else if ((++rq->errors > ERROR_MAX)) {
444                         /* we've racked up too many retries, abort */
445                         do_end_request = 1;
446                 }
447
448                 /*
449                  * End a request through request sense analysis when we have
450                  * sense data. We need this in order to perform end of media
451                  * processing.
452                  */
453                 if (do_end_request)
454                         goto end_request;
455
456                 /*
457                  * If we got a CHECK_CONDITION status, queue
458                  * a request sense command.
459                  */
460                 if (stat & ERR_STAT)
461                         cdrom_queue_request_sense(drive, NULL, NULL);
462         } else {
463                 blk_dump_rq_flags(rq, "ide-cd: bad rq");
464                 cdrom_end_request(drive, 0);
465         }
466
467         /* retry, or handle the next request */
468         return 1;
469
470 end_request:
471         if (stat & ERR_STAT) {
472                 unsigned long flags;
473
474                 spin_lock_irqsave(&ide_lock, flags);
475                 blkdev_dequeue_request(rq);
476                 HWGROUP(drive)->rq = NULL;
477                 spin_unlock_irqrestore(&ide_lock, flags);
478
479                 cdrom_queue_request_sense(drive, rq->sense, rq);
480         } else
481                 cdrom_end_request(drive, 0);
482
483         return 1;
484 }
485
486 static int cdrom_timer_expiry(ide_drive_t *drive)
487 {
488         struct request *rq = HWGROUP(drive)->rq;
489         unsigned long wait = 0;
490
491         /*
492          * Some commands are *slow* and normally take a long time to complete.
493          * Usually we can use the ATAPI "disconnect" to bypass this, but not all
494          * commands/drives support that. Let ide_timer_expiry keep polling us
495          * for these.
496          */
497         switch (rq->cmd[0]) {
498         case GPCMD_BLANK:
499         case GPCMD_FORMAT_UNIT:
500         case GPCMD_RESERVE_RZONE_TRACK:
501         case GPCMD_CLOSE_TRACK:
502         case GPCMD_FLUSH_CACHE:
503                 wait = ATAPI_WAIT_PC;
504                 break;
505         default:
506                 if (!(rq->cmd_flags & REQ_QUIET))
507                         printk(KERN_INFO "ide-cd: cmd 0x%x timed out\n",
508                                          rq->cmd[0]);
509                 wait = 0;
510                 break;
511         }
512         return wait;
513 }
514
515 /*
516  * Set up the device registers for transferring a packet command on DEV,
517  * expecting to later transfer XFERLEN bytes.  HANDLER is the routine
518  * which actually transfers the command to the drive.  If this is a
519  * drq_interrupt device, this routine will arrange for HANDLER to be
520  * called when the interrupt from the drive arrives.  Otherwise, HANDLER
521  * will be called immediately after the drive is prepared for the transfer.
522  */
523 static ide_startstop_t cdrom_start_packet_command(ide_drive_t *drive,
524                                                   int xferlen,
525                                                   ide_handler_t *handler)
526 {
527         struct cdrom_info *info = drive->driver_data;
528         ide_hwif_t *hwif = drive->hwif;
529
530         /* FIXME: for Virtual DMA we must check harder */
531         if (info->dma)
532                 info->dma = !hwif->dma_ops->dma_setup(drive);
533
534         /* set up the controller registers */
535         ide_pktcmd_tf_load(drive, IDE_TFLAG_OUT_NSECT | IDE_TFLAG_OUT_LBAL,
536                            xferlen, info->dma);
537
538         if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
539                 /* waiting for CDB interrupt, not DMA yet. */
540                 if (info->dma)
541                         drive->waiting_for_dma = 0;
542
543                 /* packet command */
544                 ide_execute_command(drive, WIN_PACKETCMD, handler,
545                                     ATAPI_WAIT_PC, cdrom_timer_expiry);
546                 return ide_started;
547         } else {
548                 ide_execute_pkt_cmd(drive);
549
550                 return (*handler) (drive);
551         }
552 }
553
554 /*
555  * Send a packet command to DRIVE described by CMD_BUF and CMD_LEN. The device
556  * registers must have already been prepared by cdrom_start_packet_command.
557  * HANDLER is the interrupt handler to call when the command completes or
558  * there's data ready.
559  */
560 #define ATAPI_MIN_CDB_BYTES 12
561 static ide_startstop_t cdrom_transfer_packet_command(ide_drive_t *drive,
562                                           struct request *rq,
563                                           ide_handler_t *handler)
564 {
565         ide_hwif_t *hwif = drive->hwif;
566         int cmd_len;
567         struct cdrom_info *info = drive->driver_data;
568         ide_startstop_t startstop;
569
570         if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
571                 /*
572                  * Here we should have been called after receiving an interrupt
573                  * from the device.  DRQ should how be set.
574                  */
575
576                 /* check for errors */
577                 if (cdrom_decode_status(drive, DRQ_STAT, NULL))
578                         return ide_stopped;
579
580                 /* ok, next interrupt will be DMA interrupt */
581                 if (info->dma)
582                         drive->waiting_for_dma = 1;
583         } else {
584                 /* otherwise, we must wait for DRQ to get set */
585                 if (ide_wait_stat(&startstop, drive, DRQ_STAT,
586                                 BUSY_STAT, WAIT_READY))
587                         return startstop;
588         }
589
590         /* arm the interrupt handler */
591         ide_set_handler(drive, handler, rq->timeout, cdrom_timer_expiry);
592
593         /* ATAPI commands get padded out to 12 bytes minimum */
594         cmd_len = COMMAND_SIZE(rq->cmd[0]);
595         if (cmd_len < ATAPI_MIN_CDB_BYTES)
596                 cmd_len = ATAPI_MIN_CDB_BYTES;
597
598         /* send the command to the device */
599         hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);
600
601         /* start the DMA if need be */
602         if (info->dma)
603                 hwif->dma_ops->dma_start(drive);
604
605         return ide_started;
606 }
607
608 /*
609  * Check the contents of the interrupt reason register from the cdrom
610  * and attempt to recover if there are problems.  Returns  0 if everything's
611  * ok; nonzero if the request has been terminated.
612  */
613 static int ide_cd_check_ireason(ide_drive_t *drive, struct request *rq,
614                                 int len, int ireason, int rw)
615 {
616         ide_hwif_t *hwif = drive->hwif;
617
618         /*
619          * ireason == 0: the drive wants to receive data from us
620          * ireason == 2: the drive is expecting to transfer data to us
621          */
622         if (ireason == (!rw << 1))
623                 return 0;
624         else if (ireason == (rw << 1)) {
625
626                 /* whoops... */
627                 printk(KERN_ERR "%s: %s: wrong transfer direction!\n",
628                                 drive->name, __func__);
629
630                 ide_pad_transfer(drive, rw, len);
631         } else  if (rw == 0 && ireason == 1) {
632                 /*
633                  * Some drives (ASUS) seem to tell us that status info is
634                  * available.  Just get it and ignore.
635                  */
636                 (void)hwif->tp_ops->read_status(hwif);
637                 return 0;
638         } else {
639                 /* drive wants a command packet, or invalid ireason... */
640                 printk(KERN_ERR "%s: %s: bad interrupt reason 0x%02x\n",
641                                 drive->name, __func__, ireason);
642         }
643
644         if (rq->cmd_type == REQ_TYPE_ATA_PC)
645                 rq->cmd_flags |= REQ_FAILED;
646
647         cdrom_end_request(drive, 0);
648         return -1;
649 }
650
651 /*
652  * Assume that the drive will always provide data in multiples of at least
653  * SECTOR_SIZE, as it gets hairy to keep track of the transfers otherwise.
654  */
655 static int ide_cd_check_transfer_size(ide_drive_t *drive, int len)
656 {
657         if ((len % SECTOR_SIZE) == 0)
658                 return 0;
659
660         printk(KERN_ERR "%s: %s: Bad transfer size %d\n",
661                         drive->name, __func__, len);
662
663         if (drive->atapi_flags & IDE_AFLAG_LIMIT_NFRAMES)
664                 printk(KERN_ERR "  This drive is not supported by "
665                                 "this version of the driver\n");
666         else {
667                 printk(KERN_ERR "  Trying to limit transfer sizes\n");
668                 drive->atapi_flags |= IDE_AFLAG_LIMIT_NFRAMES;
669         }
670
671         return 1;
672 }
673
674 static ide_startstop_t cdrom_newpc_intr(ide_drive_t *);
675
676 static ide_startstop_t ide_cd_prepare_rw_request(ide_drive_t *drive,
677                                                  struct request *rq)
678 {
679         if (rq_data_dir(rq) == READ) {
680                 unsigned short sectors_per_frame =
681                         queue_hardsect_size(drive->queue) >> SECTOR_BITS;
682                 int nskip = rq->sector & (sectors_per_frame - 1);
683
684                 /*
685                  * If the requested sector doesn't start on a frame boundary,
686                  * we must adjust the start of the transfer so that it does,
687                  * and remember to skip the first few sectors.
688                  *
689                  * If the rq->current_nr_sectors field is larger than the size
690                  * of the buffer, it will mean that we're to skip a number of
691                  * sectors equal to the amount by which rq->current_nr_sectors
692                  * is larger than the buffer size.
693                  */
694                 if (nskip > 0) {
695                         /* sanity check... */
696                         if (rq->current_nr_sectors !=
697                             bio_cur_sectors(rq->bio)) {
698                                 printk(KERN_ERR "%s: %s: buffer botch (%u)\n",
699                                                 drive->name, __func__,
700                                                 rq->current_nr_sectors);
701                                 cdrom_end_request(drive, 0);
702                                 return ide_stopped;
703                         }
704                         rq->current_nr_sectors += nskip;
705                 }
706         }
707 #if 0
708         else
709                 /* the immediate bit */
710                 rq->cmd[1] = 1 << 3;
711 #endif
712         /* set up the command */
713         rq->timeout = ATAPI_WAIT_PC;
714
715         return ide_started;
716 }
717
718 /*
719  * Routine to send a read/write packet command to the drive. This is usually
720  * called directly from cdrom_start_{read,write}(). However, for drq_interrupt
721  * devices, it is called from an interrupt when the drive is ready to accept
722  * the command.
723  */
724 static ide_startstop_t cdrom_start_rw_cont(ide_drive_t *drive)
725 {
726         struct request *rq = drive->hwif->hwgroup->rq;
727
728         /* send the command to the drive and return */
729         return cdrom_transfer_packet_command(drive, rq, cdrom_newpc_intr);
730 }
731
732 #define IDECD_SEEK_THRESHOLD    (1000)                  /* 1000 blocks */
733 #define IDECD_SEEK_TIMER        (5 * WAIT_MIN_SLEEP)    /* 100 ms */
734 #define IDECD_SEEK_TIMEOUT      (2 * WAIT_CMD)          /* 20 sec */
735
736 static ide_startstop_t cdrom_seek_intr(ide_drive_t *drive)
737 {
738         struct cdrom_info *info = drive->driver_data;
739         int stat;
740         static int retry = 10;
741
742         if (cdrom_decode_status(drive, 0, &stat))
743                 return ide_stopped;
744
745         drive->atapi_flags |= IDE_AFLAG_SEEKING;
746
747         if (retry && time_after(jiffies, info->start_seek + IDECD_SEEK_TIMER)) {
748                 if (--retry == 0)
749                         drive->dsc_overlap = 0;
750         }
751         return ide_stopped;
752 }
753
754 static void ide_cd_prepare_seek_request(ide_drive_t *drive, struct request *rq)
755 {
756         sector_t frame = rq->sector;
757
758         sector_div(frame, queue_hardsect_size(drive->queue) >> SECTOR_BITS);
759
760         memset(rq->cmd, 0, BLK_MAX_CDB);
761         rq->cmd[0] = GPCMD_SEEK;
762         put_unaligned(cpu_to_be32(frame), (unsigned int *) &rq->cmd[2]);
763
764         rq->timeout = ATAPI_WAIT_PC;
765 }
766
767 static ide_startstop_t cdrom_start_seek_continuation(ide_drive_t *drive)
768 {
769         struct request *rq = drive->hwif->hwgroup->rq;
770
771         return cdrom_transfer_packet_command(drive, rq, &cdrom_seek_intr);
772 }
773
774 /*
775  * Fix up a possibly partially-processed request so that we can start it over
776  * entirely, or even put it back on the request queue.
777  */
778 static void restore_request(struct request *rq)
779 {
780         if (rq->buffer != bio_data(rq->bio)) {
781                 sector_t n =
782                         (rq->buffer - (char *)bio_data(rq->bio)) / SECTOR_SIZE;
783
784                 rq->buffer = bio_data(rq->bio);
785                 rq->nr_sectors += n;
786                 rq->sector -= n;
787         }
788         rq->current_nr_sectors = bio_cur_sectors(rq->bio);
789         rq->hard_cur_sectors = rq->current_nr_sectors;
790         rq->hard_nr_sectors = rq->nr_sectors;
791         rq->hard_sector = rq->sector;
792         rq->q->prep_rq_fn(rq->q, rq);
793 }
794
795 /*
796  * All other packet commands.
797  */
798 static void ide_cd_request_sense_fixup(struct request *rq)
799 {
800         /*
801          * Some of the trailing request sense fields are optional,
802          * and some drives don't send them.  Sigh.
803          */
804         if (rq->cmd[0] == GPCMD_REQUEST_SENSE &&
805             rq->data_len > 0 && rq->data_len <= 5)
806                 while (rq->data_len > 0) {
807                         *(u8 *)rq->data++ = 0;
808                         --rq->data_len;
809                 }
810 }
811
812 int ide_cd_queue_pc(ide_drive_t *drive, const unsigned char *cmd,
813                     int write, void *buffer, unsigned *bufflen,
814                     struct request_sense *sense, int timeout,
815                     unsigned int cmd_flags)
816 {
817         struct cdrom_info *info = drive->driver_data;
818         struct request_sense local_sense;
819         int retries = 10;
820         unsigned int flags = 0;
821
822         if (!sense)
823                 sense = &local_sense;
824
825         /* start of retry loop */
826         do {
827                 struct request *rq;
828                 int error;
829
830                 rq = blk_get_request(drive->queue, write, __GFP_WAIT);
831
832                 memcpy(rq->cmd, cmd, BLK_MAX_CDB);
833                 rq->cmd_type = REQ_TYPE_ATA_PC;
834                 rq->sense = sense;
835                 rq->cmd_flags |= cmd_flags;
836                 rq->timeout = timeout;
837                 if (buffer) {
838                         rq->data = buffer;
839                         rq->data_len = *bufflen;
840                 }
841
842                 error = blk_execute_rq(drive->queue, info->disk, rq, 0);
843
844                 if (buffer)
845                         *bufflen = rq->data_len;
846
847                 flags = rq->cmd_flags;
848                 blk_put_request(rq);
849
850                 /*
851                  * FIXME: we should probably abort/retry or something in case of
852                  * failure.
853                  */
854                 if (flags & REQ_FAILED) {
855                         /*
856                          * The request failed.  Retry if it was due to a unit
857                          * attention status (usually means media was changed).
858                          */
859                         struct request_sense *reqbuf = sense;
860
861                         if (reqbuf->sense_key == UNIT_ATTENTION)
862                                 cdrom_saw_media_change(drive);
863                         else if (reqbuf->sense_key == NOT_READY &&
864                                  reqbuf->asc == 4 && reqbuf->ascq != 4) {
865                                 /*
866                                  * The drive is in the process of loading
867                                  * a disk.  Retry, but wait a little to give
868                                  * the drive time to complete the load.
869                                  */
870                                 ssleep(2);
871                         } else {
872                                 /* otherwise, don't retry */
873                                 retries = 0;
874                         }
875                         --retries;
876                 }
877
878                 /* end of retry loop */
879         } while ((flags & REQ_FAILED) && retries >= 0);
880
881         /* return an error if the command failed */
882         return (flags & REQ_FAILED) ? -EIO : 0;
883 }
884
885 /*
886  * Called from blk_end_request_callback() after the data of the request is
887  * completed and before the request itself is completed. By returning value '1',
888  * blk_end_request_callback() returns immediately without completing it.
889  */
890 static int cdrom_newpc_intr_dummy_cb(struct request *rq)
891 {
892         return 1;
893 }
894
895 static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
896 {
897         ide_hwif_t *hwif = drive->hwif;
898         struct cdrom_info *info = drive->driver_data;
899         struct request *rq = HWGROUP(drive)->rq;
900         xfer_func_t *xferfunc;
901         ide_expiry_t *expiry = NULL;
902         int dma_error = 0, dma, stat, thislen, uptodate = 0;
903         int write = (rq_data_dir(rq) == WRITE) ? 1 : 0;
904         unsigned int timeout;
905         u16 len;
906         u8 ireason;
907
908         /* check for errors */
909         dma = info->dma;
910         if (dma) {
911                 info->dma = 0;
912                 dma_error = hwif->dma_ops->dma_end(drive);
913                 if (dma_error) {
914                         printk(KERN_ERR "%s: DMA %s error\n", drive->name,
915                                         write ? "write" : "read");
916                         ide_dma_off(drive);
917                 }
918         }
919
920         if (cdrom_decode_status(drive, 0, &stat))
921                 return ide_stopped;
922
923         /* using dma, transfer is complete now */
924         if (dma) {
925                 if (dma_error)
926                         return ide_error(drive, "dma error", stat);
927                 if (blk_fs_request(rq)) {
928                         ide_end_request(drive, 1, rq->nr_sectors);
929                         return ide_stopped;
930                 }
931                 goto end_request;
932         }
933
934         ide_read_bcount_and_ireason(drive, &len, &ireason);
935
936         thislen = blk_fs_request(rq) ? len : rq->data_len;
937         if (thislen > len)
938                 thislen = len;
939
940         /* If DRQ is clear, the command has completed. */
941         if ((stat & DRQ_STAT) == 0) {
942                 if (blk_fs_request(rq)) {
943                         /*
944                          * If we're not done reading/writing, complain.
945                          * Otherwise, complete the command normally.
946                          */
947                         uptodate = 1;
948                         if (rq->current_nr_sectors > 0) {
949                                 printk(KERN_ERR "%s: %s: data underrun "
950                                                 "(%d blocks)\n",
951                                                 drive->name, __func__,
952                                                 rq->current_nr_sectors);
953                                 if (!write)
954                                         rq->cmd_flags |= REQ_FAILED;
955                                 uptodate = 0;
956                         }
957                         cdrom_end_request(drive, uptodate);
958                         return ide_stopped;
959                 } else if (!blk_pc_request(rq)) {
960                         ide_cd_request_sense_fixup(rq);
961                         /* complain if we still have data left to transfer */
962                         uptodate = rq->data_len ? 0 : 1;
963                 }
964                 goto end_request;
965         }
966
967         /* check which way to transfer data */
968         if (ide_cd_check_ireason(drive, rq, len, ireason, write))
969                 return ide_stopped;
970
971         if (blk_fs_request(rq)) {
972                 if (write == 0) {
973                         int nskip;
974
975                         if (ide_cd_check_transfer_size(drive, len)) {
976                                 cdrom_end_request(drive, 0);
977                                 return ide_stopped;
978                         }
979
980                         /*
981                          * First, figure out if we need to bit-bucket
982                          * any of the leading sectors.
983                          */
984                         nskip = min_t(int, rq->current_nr_sectors
985                                            - bio_cur_sectors(rq->bio),
986                                            thislen >> 9);
987                         if (nskip > 0) {
988                                 ide_pad_transfer(drive, write, nskip << 9);
989                                 rq->current_nr_sectors -= nskip;
990                                 thislen -= (nskip << 9);
991                         }
992                 }
993         }
994
995         if (ireason == 0) {
996                 write = 1;
997                 xferfunc = hwif->tp_ops->output_data;
998         } else {
999                 write = 0;
1000                 xferfunc = hwif->tp_ops->input_data;
1001         }
1002
1003         /* transfer data */
1004         while (thislen > 0) {
1005                 u8 *ptr = blk_fs_request(rq) ? NULL : rq->data;
1006                 int blen = rq->data_len;
1007
1008                 /* bio backed? */
1009                 if (rq->bio) {
1010                         if (blk_fs_request(rq)) {
1011                                 ptr = rq->buffer;
1012                                 blen = rq->current_nr_sectors << 9;
1013                         } else {
1014                                 ptr = bio_data(rq->bio);
1015                                 blen = bio_iovec(rq->bio)->bv_len;
1016                         }
1017                 }
1018
1019                 if (!ptr) {
1020                         if (blk_fs_request(rq) && !write)
1021                                 /*
1022                                  * If the buffers are full, pipe the rest into
1023                                  * oblivion.
1024                                  */
1025                                 ide_pad_transfer(drive, 0, thislen);
1026                         else {
1027                                 printk(KERN_ERR "%s: confused, missing data\n",
1028                                                 drive->name);
1029                                 blk_dump_rq_flags(rq, rq_data_dir(rq)
1030                                                   ? "cdrom_newpc_intr, write"
1031                                                   : "cdrom_newpc_intr, read");
1032                         }
1033                         break;
1034                 }
1035
1036                 if (blen > thislen)
1037                         blen = thislen;
1038
1039                 xferfunc(drive, NULL, ptr, blen);
1040
1041                 thislen -= blen;
1042                 len -= blen;
1043
1044                 if (blk_fs_request(rq)) {
1045                         rq->buffer += blen;
1046                         rq->nr_sectors -= (blen >> 9);
1047                         rq->current_nr_sectors -= (blen >> 9);
1048                         rq->sector += (blen >> 9);
1049
1050                         if (rq->current_nr_sectors == 0 && rq->nr_sectors)
1051                                 cdrom_end_request(drive, 1);
1052                 } else {
1053                         rq->data_len -= blen;
1054
1055                         /*
1056                          * The request can't be completed until DRQ is cleared.
1057                          * So complete the data, but don't complete the request
1058                          * using the dummy function for the callback feature
1059                          * of blk_end_request_callback().
1060                          */
1061                         if (rq->bio)
1062                                 blk_end_request_callback(rq, 0, blen,
1063                                                  cdrom_newpc_intr_dummy_cb);
1064                         else
1065                                 rq->data += blen;
1066                 }
1067                 if (!write && blk_sense_request(rq))
1068                         rq->sense_len += blen;
1069         }
1070
1071         /* pad, if necessary */
1072         if (!blk_fs_request(rq) && len > 0)
1073                 ide_pad_transfer(drive, write, len);
1074
1075         if (blk_pc_request(rq)) {
1076                 timeout = rq->timeout;
1077         } else {
1078                 timeout = ATAPI_WAIT_PC;
1079                 if (!blk_fs_request(rq))
1080                         expiry = cdrom_timer_expiry;
1081         }
1082
1083         ide_set_handler(drive, cdrom_newpc_intr, timeout, expiry);
1084         return ide_started;
1085
1086 end_request:
1087         if (blk_pc_request(rq)) {
1088                 unsigned long flags;
1089                 unsigned int dlen = rq->data_len;
1090
1091                 if (dma)
1092                         rq->data_len = 0;
1093
1094                 spin_lock_irqsave(&ide_lock, flags);
1095                 if (__blk_end_request(rq, 0, dlen))
1096                         BUG();
1097                 HWGROUP(drive)->rq = NULL;
1098                 spin_unlock_irqrestore(&ide_lock, flags);
1099         } else {
1100                 if (!uptodate)
1101                         rq->cmd_flags |= REQ_FAILED;
1102                 cdrom_end_request(drive, uptodate);
1103         }
1104         return ide_stopped;
1105 }
1106
1107 static ide_startstop_t cdrom_start_rw(ide_drive_t *drive, struct request *rq)
1108 {
1109         struct cdrom_info *cd = drive->driver_data;
1110         int write = rq_data_dir(rq) == WRITE;
1111         unsigned short sectors_per_frame =
1112                 queue_hardsect_size(drive->queue) >> SECTOR_BITS;
1113
1114         if (write) {
1115                 /* disk has become write protected */
1116                 if (cd->disk->policy) {
1117                         cdrom_end_request(drive, 0);
1118                         return ide_stopped;
1119                 }
1120         } else {
1121                 /*
1122                  * We may be retrying this request after an error.  Fix up any
1123                  * weirdness which might be present in the request packet.
1124                  */
1125                 restore_request(rq);
1126         }
1127
1128         /* use DMA, if possible / writes *must* be hardware frame aligned */
1129         if ((rq->nr_sectors & (sectors_per_frame - 1)) ||
1130             (rq->sector & (sectors_per_frame - 1))) {
1131                 if (write) {
1132                         cdrom_end_request(drive, 0);
1133                         return ide_stopped;
1134                 }
1135                 cd->dma = 0;
1136         } else
1137                 cd->dma = drive->using_dma;
1138
1139         if (write)
1140                 cd->devinfo.media_written = 1;
1141
1142         return ide_started;
1143 }
1144
1145 static ide_startstop_t cdrom_do_newpc_cont(ide_drive_t *drive)
1146 {
1147         struct request *rq = HWGROUP(drive)->rq;
1148
1149         return cdrom_transfer_packet_command(drive, rq, cdrom_newpc_intr);
1150 }
1151
1152 static void cdrom_do_block_pc(ide_drive_t *drive, struct request *rq)
1153 {
1154         struct cdrom_info *info = drive->driver_data;
1155
1156         if (blk_pc_request(rq))
1157                 rq->cmd_flags |= REQ_QUIET;
1158         else
1159                 rq->cmd_flags &= ~REQ_FAILED;
1160
1161         info->dma = 0;
1162
1163         /* sg request */
1164         if (rq->bio || ((rq->cmd_type == REQ_TYPE_ATA_PC) && rq->data_len)) {
1165                 struct request_queue *q = drive->queue;
1166                 unsigned int alignment;
1167                 unsigned long addr;
1168                 unsigned long stack_mask = ~(THREAD_SIZE - 1);
1169
1170                 if (rq->bio)
1171                         addr = (unsigned long)bio_data(rq->bio);
1172                 else
1173                         addr = (unsigned long)rq->data;
1174
1175                 info->dma = drive->using_dma;
1176
1177                 /*
1178                  * check if dma is safe
1179                  *
1180                  * NOTE! The "len" and "addr" checks should possibly have
1181                  * separate masks.
1182                  */
1183                 alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1184                 if (addr & alignment || rq->data_len & alignment)
1185                         info->dma = 0;
1186
1187                 if (!((addr & stack_mask) ^
1188                       ((unsigned long)current->stack & stack_mask)))
1189                         info->dma = 0;
1190         }
1191 }
1192
1193 /*
1194  * cdrom driver request routine.
1195  */
1196 static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
1197                                         sector_t block)
1198 {
1199         struct cdrom_info *info = drive->driver_data;
1200         ide_handler_t *fn;
1201         int xferlen;
1202
1203         if (blk_fs_request(rq)) {
1204                 if (drive->atapi_flags & IDE_AFLAG_SEEKING) {
1205                         ide_hwif_t *hwif = drive->hwif;
1206                         unsigned long elapsed = jiffies - info->start_seek;
1207                         int stat = hwif->tp_ops->read_status(hwif);
1208
1209                         if ((stat & SEEK_STAT) != SEEK_STAT) {
1210                                 if (elapsed < IDECD_SEEK_TIMEOUT) {
1211                                         ide_stall_queue(drive,
1212                                                         IDECD_SEEK_TIMER);
1213                                         return ide_stopped;
1214                                 }
1215                                 printk(KERN_ERR "%s: DSC timeout\n",
1216                                                 drive->name);
1217                         }
1218                         drive->atapi_flags &= ~IDE_AFLAG_SEEKING;
1219                 }
1220                 if (rq_data_dir(rq) == READ &&
1221                     IDE_LARGE_SEEK(info->last_block, block,
1222                             IDECD_SEEK_THRESHOLD) &&
1223                     drive->dsc_overlap) {
1224                         xferlen = 0;
1225                         fn = cdrom_start_seek_continuation;
1226
1227                         info->dma = 0;
1228                         info->start_seek = jiffies;
1229
1230                         ide_cd_prepare_seek_request(drive, rq);
1231                 } else {
1232                         xferlen = 32768;
1233                         fn = cdrom_start_rw_cont;
1234
1235                         if (cdrom_start_rw(drive, rq) == ide_stopped)
1236                                 return ide_stopped;
1237
1238                         if (ide_cd_prepare_rw_request(drive, rq) == ide_stopped)
1239                                 return ide_stopped;
1240                 }
1241                 info->last_block = block;
1242         } else if (blk_sense_request(rq) || blk_pc_request(rq) ||
1243                    rq->cmd_type == REQ_TYPE_ATA_PC) {
1244                 xferlen = rq->data_len;
1245                 fn = cdrom_do_newpc_cont;
1246
1247                 if (!rq->timeout)
1248                         rq->timeout = ATAPI_WAIT_PC;
1249
1250                 cdrom_do_block_pc(drive, rq);
1251         } else if (blk_special_request(rq)) {
1252                 /* right now this can only be a reset... */
1253                 cdrom_end_request(drive, 1);
1254                 return ide_stopped;
1255         } else {
1256                 blk_dump_rq_flags(rq, "ide-cd bad flags");
1257                 cdrom_end_request(drive, 0);
1258                 return ide_stopped;
1259         }
1260
1261         return cdrom_start_packet_command(drive, xferlen, fn);
1262 }
1263
1264 /*
1265  * Ioctl handling.
1266  *
1267  * Routines which queue packet commands take as a final argument a pointer to a
1268  * request_sense struct. If execution of the command results in an error with a
1269  * CHECK CONDITION status, this structure will be filled with the results of the
1270  * subsequent request sense command. The pointer can also be NULL, in which case
1271  * no sense information is returned.
1272  */
1273 static void msf_from_bcd(struct atapi_msf *msf)
1274 {
1275         msf->minute = BCD2BIN(msf->minute);
1276         msf->second = BCD2BIN(msf->second);
1277         msf->frame  = BCD2BIN(msf->frame);
1278 }
1279
1280 int cdrom_check_status(ide_drive_t *drive, struct request_sense *sense)
1281 {
1282         struct cdrom_info *info = drive->driver_data;
1283         struct cdrom_device_info *cdi = &info->devinfo;
1284         unsigned char cmd[BLK_MAX_CDB];
1285
1286         memset(cmd, 0, BLK_MAX_CDB);
1287         cmd[0] = GPCMD_TEST_UNIT_READY;
1288
1289         /*
1290          * Sanyo 3 CD changer uses byte 7 of TEST_UNIT_READY to switch CDs
1291          * instead of supporting the LOAD_UNLOAD opcode.
1292          */
1293         cmd[7] = cdi->sanyo_slot % 3;
1294
1295         return ide_cd_queue_pc(drive, cmd, 0, NULL, NULL, sense, 0, REQ_QUIET);
1296 }
1297
1298 static int cdrom_read_capacity(ide_drive_t *drive, unsigned long *capacity,
1299                                unsigned long *sectors_per_frame,
1300                                struct request_sense *sense)
1301 {
1302         struct {
1303                 __be32 lba;
1304                 __be32 blocklen;
1305         } capbuf;
1306
1307         int stat;
1308         unsigned char cmd[BLK_MAX_CDB];
1309         unsigned len = sizeof(capbuf);
1310
1311         memset(cmd, 0, BLK_MAX_CDB);
1312         cmd[0] = GPCMD_READ_CDVD_CAPACITY;
1313
1314         stat = ide_cd_queue_pc(drive, cmd, 0, &capbuf, &len, sense, 0,
1315                                REQ_QUIET);
1316         if (stat)
1317                 return stat;
1318
1319         /*
1320          * Sanity check the given block size
1321          */
1322         switch (capbuf.blocklen) {
1323         case __constant_cpu_to_be32(512):
1324         case __constant_cpu_to_be32(1024):
1325         case __constant_cpu_to_be32(2048):
1326         case __constant_cpu_to_be32(4096):
1327                 break;
1328         default:
1329                 printk(KERN_ERR "%s: weird block size %u\n",
1330                         drive->name, capbuf.blocklen);
1331                 printk(KERN_ERR "%s: default to 2kb block size\n",
1332                         drive->name);
1333                 capbuf.blocklen = __constant_cpu_to_be32(2048);
1334                 break;
1335         }
1336
1337         *capacity = 1 + be32_to_cpu(capbuf.lba);
1338         *sectors_per_frame = be32_to_cpu(capbuf.blocklen) >> SECTOR_BITS;
1339         return 0;
1340 }
1341
1342 static int cdrom_read_tocentry(ide_drive_t *drive, int trackno, int msf_flag,
1343                                 int format, char *buf, int buflen,
1344                                 struct request_sense *sense)
1345 {
1346         unsigned char cmd[BLK_MAX_CDB];
1347
1348         memset(cmd, 0, BLK_MAX_CDB);
1349
1350         cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
1351         cmd[6] = trackno;
1352         cmd[7] = (buflen >> 8);
1353         cmd[8] = (buflen & 0xff);
1354         cmd[9] = (format << 6);
1355
1356         if (msf_flag)
1357                 cmd[1] = 2;
1358
1359         return ide_cd_queue_pc(drive, cmd, 0, buf, &buflen, sense, 0, REQ_QUIET);
1360 }
1361
1362 /* Try to read the entire TOC for the disk into our internal buffer. */
1363 int ide_cd_read_toc(ide_drive_t *drive, struct request_sense *sense)
1364 {
1365         int stat, ntracks, i;
1366         struct cdrom_info *info = drive->driver_data;
1367         struct cdrom_device_info *cdi = &info->devinfo;
1368         struct atapi_toc *toc = info->toc;
1369         struct {
1370                 struct atapi_toc_header hdr;
1371                 struct atapi_toc_entry  ent;
1372         } ms_tmp;
1373         long last_written;
1374         unsigned long sectors_per_frame = SECTORS_PER_FRAME;
1375
1376         if (toc == NULL) {
1377                 /* try to allocate space */
1378                 toc = kmalloc(sizeof(struct atapi_toc), GFP_KERNEL);
1379                 if (toc == NULL) {
1380                         printk(KERN_ERR "%s: No cdrom TOC buffer!\n",
1381                                         drive->name);
1382                         return -ENOMEM;
1383                 }
1384                 info->toc = toc;
1385         }
1386
1387         /*
1388          * Check to see if the existing data is still valid. If it is,
1389          * just return.
1390          */
1391         (void) cdrom_check_status(drive, sense);
1392
1393         if (drive->atapi_flags & IDE_AFLAG_TOC_VALID)
1394                 return 0;
1395
1396         /* try to get the total cdrom capacity and sector size */
1397         stat = cdrom_read_capacity(drive, &toc->capacity, &sectors_per_frame,
1398                                    sense);
1399         if (stat)
1400                 toc->capacity = 0x1fffff;
1401
1402         set_capacity(info->disk, toc->capacity * sectors_per_frame);
1403         /* save a private copy of the TOC capacity for error handling */
1404         drive->probed_capacity = toc->capacity * sectors_per_frame;
1405
1406         blk_queue_hardsect_size(drive->queue,
1407                                 sectors_per_frame << SECTOR_BITS);
1408
1409         /* first read just the header, so we know how long the TOC is */
1410         stat = cdrom_read_tocentry(drive, 0, 1, 0, (char *) &toc->hdr,
1411                                     sizeof(struct atapi_toc_header), sense);
1412         if (stat)
1413                 return stat;
1414
1415         if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
1416                 toc->hdr.first_track = BCD2BIN(toc->hdr.first_track);
1417                 toc->hdr.last_track  = BCD2BIN(toc->hdr.last_track);
1418         }
1419
1420         ntracks = toc->hdr.last_track - toc->hdr.first_track + 1;
1421         if (ntracks <= 0)
1422                 return -EIO;
1423         if (ntracks > MAX_TRACKS)
1424                 ntracks = MAX_TRACKS;
1425
1426         /* now read the whole schmeer */
1427         stat = cdrom_read_tocentry(drive, toc->hdr.first_track, 1, 0,
1428                                   (char *)&toc->hdr,
1429                                    sizeof(struct atapi_toc_header) +
1430                                    (ntracks + 1) *
1431                                    sizeof(struct atapi_toc_entry), sense);
1432
1433         if (stat && toc->hdr.first_track > 1) {
1434                 /*
1435                  * Cds with CDI tracks only don't have any TOC entries, despite
1436                  * of this the returned values are
1437                  * first_track == last_track = number of CDI tracks + 1,
1438                  * so that this case is indistinguishable from the same layout
1439                  * plus an additional audio track. If we get an error for the
1440                  * regular case, we assume a CDI without additional audio
1441                  * tracks. In this case the readable TOC is empty (CDI tracks
1442                  * are not included) and only holds the Leadout entry.
1443                  *
1444                  * Heiko EiƟfeldt.
1445                  */
1446                 ntracks = 0;
1447                 stat = cdrom_read_tocentry(drive, CDROM_LEADOUT, 1, 0,
1448                                            (char *)&toc->hdr,
1449                                            sizeof(struct atapi_toc_header) +
1450                                            (ntracks + 1) *
1451                                            sizeof(struct atapi_toc_entry),
1452                                            sense);
1453                 if (stat)
1454                         return stat;
1455
1456                 if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
1457                         toc->hdr.first_track = (u8)BIN2BCD(CDROM_LEADOUT);
1458                         toc->hdr.last_track = (u8)BIN2BCD(CDROM_LEADOUT);
1459                 } else {
1460                         toc->hdr.first_track = CDROM_LEADOUT;
1461                         toc->hdr.last_track = CDROM_LEADOUT;
1462                 }
1463         }
1464
1465         if (stat)
1466                 return stat;
1467
1468         toc->hdr.toc_length = be16_to_cpu(toc->hdr.toc_length);
1469
1470         if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
1471                 toc->hdr.first_track = BCD2BIN(toc->hdr.first_track);
1472                 toc->hdr.last_track  = BCD2BIN(toc->hdr.last_track);
1473         }
1474
1475         for (i = 0; i <= ntracks; i++) {
1476                 if (drive->atapi_flags & IDE_AFLAG_TOCADDR_AS_BCD) {
1477                         if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD)
1478                                 toc->ent[i].track = BCD2BIN(toc->ent[i].track);
1479                         msf_from_bcd(&toc->ent[i].addr.msf);
1480                 }
1481                 toc->ent[i].addr.lba = msf_to_lba(toc->ent[i].addr.msf.minute,
1482                                                   toc->ent[i].addr.msf.second,
1483                                                   toc->ent[i].addr.msf.frame);
1484         }
1485
1486         if (toc->hdr.first_track != CDROM_LEADOUT) {
1487                 /* read the multisession information */
1488                 stat = cdrom_read_tocentry(drive, 0, 0, 1, (char *)&ms_tmp,
1489                                            sizeof(ms_tmp), sense);
1490                 if (stat)
1491                         return stat;
1492
1493                 toc->last_session_lba = be32_to_cpu(ms_tmp.ent.addr.lba);
1494         } else {
1495                 ms_tmp.hdr.last_track = CDROM_LEADOUT;
1496                 ms_tmp.hdr.first_track = ms_tmp.hdr.last_track;
1497                 toc->last_session_lba = msf_to_lba(0, 2, 0); /* 0m 2s 0f */
1498         }
1499
1500         if (drive->atapi_flags & IDE_AFLAG_TOCADDR_AS_BCD) {
1501                 /* re-read multisession information using MSF format */
1502                 stat = cdrom_read_tocentry(drive, 0, 1, 1, (char *)&ms_tmp,
1503                                            sizeof(ms_tmp), sense);
1504                 if (stat)
1505                         return stat;
1506
1507                 msf_from_bcd(&ms_tmp.ent.addr.msf);
1508                 toc->last_session_lba = msf_to_lba(ms_tmp.ent.addr.msf.minute,
1509                                                    ms_tmp.ent.addr.msf.second,
1510                                                    ms_tmp.ent.addr.msf.frame);
1511         }
1512
1513         toc->xa_flag = (ms_tmp.hdr.first_track != ms_tmp.hdr.last_track);
1514
1515         /* now try to get the total cdrom capacity */
1516         stat = cdrom_get_last_written(cdi, &last_written);
1517         if (!stat && (last_written > toc->capacity)) {
1518                 toc->capacity = last_written;
1519                 set_capacity(info->disk, toc->capacity * sectors_per_frame);
1520                 drive->probed_capacity = toc->capacity * sectors_per_frame;
1521         }
1522
1523         /* Remember that we've read this stuff. */
1524         drive->atapi_flags |= IDE_AFLAG_TOC_VALID;
1525
1526         return 0;
1527 }
1528
1529 int ide_cdrom_get_capabilities(ide_drive_t *drive, u8 *buf)
1530 {
1531         struct cdrom_info *info = drive->driver_data;
1532         struct cdrom_device_info *cdi = &info->devinfo;
1533         struct packet_command cgc;
1534         int stat, attempts = 3, size = ATAPI_CAPABILITIES_PAGE_SIZE;
1535
1536         if ((drive->atapi_flags & IDE_AFLAG_FULL_CAPS_PAGE) == 0)
1537                 size -= ATAPI_CAPABILITIES_PAGE_PAD_SIZE;
1538
1539         init_cdrom_command(&cgc, buf, size, CGC_DATA_UNKNOWN);
1540         do {
1541                 /* we seem to get stat=0x01,err=0x00 the first time (??) */
1542                 stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1543                 if (!stat)
1544                         break;
1545         } while (--attempts);
1546         return stat;
1547 }
1548
1549 void ide_cdrom_update_speed(ide_drive_t *drive, u8 *buf)
1550 {
1551         struct cdrom_info *cd = drive->driver_data;
1552         u16 curspeed, maxspeed;
1553
1554         if (drive->atapi_flags & IDE_AFLAG_LE_SPEED_FIELDS) {
1555                 curspeed = le16_to_cpup((__le16 *)&buf[8 + 14]);
1556                 maxspeed = le16_to_cpup((__le16 *)&buf[8 + 8]);
1557         } else {
1558                 curspeed = be16_to_cpup((__be16 *)&buf[8 + 14]);
1559                 maxspeed = be16_to_cpup((__be16 *)&buf[8 + 8]);
1560         }
1561
1562         cd->current_speed = (curspeed + (176/2)) / 176;
1563         cd->max_speed = (maxspeed + (176/2)) / 176;
1564 }
1565
1566 #define IDE_CD_CAPABILITIES \
1567         (CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK | CDC_SELECT_SPEED | \
1568          CDC_SELECT_DISC | CDC_MULTI_SESSION | CDC_MCN | CDC_MEDIA_CHANGED | \
1569          CDC_PLAY_AUDIO | CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R | \
1570          CDC_CD_RW | CDC_DVD | CDC_DVD_R | CDC_DVD_RAM | CDC_GENERIC_PACKET | \
1571          CDC_MO_DRIVE | CDC_MRW | CDC_MRW_W | CDC_RAM)
1572
1573 static struct cdrom_device_ops ide_cdrom_dops = {
1574         .open                   = ide_cdrom_open_real,
1575         .release                = ide_cdrom_release_real,
1576         .drive_status           = ide_cdrom_drive_status,
1577         .media_changed          = ide_cdrom_check_media_change_real,
1578         .tray_move              = ide_cdrom_tray_move,
1579         .lock_door              = ide_cdrom_lock_door,
1580         .select_speed           = ide_cdrom_select_speed,
1581         .get_last_session       = ide_cdrom_get_last_session,
1582         .get_mcn                = ide_cdrom_get_mcn,
1583         .reset                  = ide_cdrom_reset,
1584         .audio_ioctl            = ide_cdrom_audio_ioctl,
1585         .capability             = IDE_CD_CAPABILITIES,
1586         .generic_packet         = ide_cdrom_packet,
1587 };
1588
1589 static int ide_cdrom_register(ide_drive_t *drive, int nslots)
1590 {
1591         struct cdrom_info *info = drive->driver_data;
1592         struct cdrom_device_info *devinfo = &info->devinfo;
1593
1594         devinfo->ops = &ide_cdrom_dops;
1595         devinfo->speed = info->current_speed;
1596         devinfo->capacity = nslots;
1597         devinfo->handle = drive;
1598         strcpy(devinfo->name, drive->name);
1599
1600         if (drive->atapi_flags & IDE_AFLAG_NO_SPEED_SELECT)
1601                 devinfo->mask |= CDC_SELECT_SPEED;
1602
1603         devinfo->disk = info->disk;
1604         return register_cdrom(devinfo);
1605 }
1606
1607 static int ide_cdrom_probe_capabilities(ide_drive_t *drive)
1608 {
1609         struct cdrom_info *cd = drive->driver_data;
1610         struct cdrom_device_info *cdi = &cd->devinfo;
1611         u8 buf[ATAPI_CAPABILITIES_PAGE_SIZE];
1612         mechtype_t mechtype;
1613         int nslots = 1;
1614
1615         cdi->mask = (CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R |
1616                      CDC_DVD_RAM | CDC_SELECT_DISC | CDC_PLAY_AUDIO |
1617                      CDC_MO_DRIVE | CDC_RAM);
1618
1619         if (drive->media == ide_optical) {
1620                 cdi->mask &= ~(CDC_MO_DRIVE | CDC_RAM);
1621                 printk(KERN_ERR "%s: ATAPI magneto-optical drive\n",
1622                                 drive->name);
1623                 return nslots;
1624         }
1625
1626         if (drive->atapi_flags & IDE_AFLAG_PRE_ATAPI12) {
1627                 drive->atapi_flags &= ~IDE_AFLAG_NO_EJECT;
1628                 cdi->mask &= ~CDC_PLAY_AUDIO;
1629                 return nslots;
1630         }
1631
1632         /*
1633          * We have to cheat a little here. the packet will eventually be queued
1634          * with ide_cdrom_packet(), which extracts the drive from cdi->handle.
1635          * Since this device hasn't been registered with the Uniform layer yet,
1636          * it can't do this. Same goes for cdi->ops.
1637          */
1638         cdi->handle = drive;
1639         cdi->ops = &ide_cdrom_dops;
1640
1641         if (ide_cdrom_get_capabilities(drive, buf))
1642                 return 0;
1643
1644         if ((buf[8 + 6] & 0x01) == 0)
1645                 drive->atapi_flags |= IDE_AFLAG_NO_DOORLOCK;
1646         if (buf[8 + 6] & 0x08)
1647                 drive->atapi_flags &= ~IDE_AFLAG_NO_EJECT;
1648         if (buf[8 + 3] & 0x01)
1649                 cdi->mask &= ~CDC_CD_R;
1650         if (buf[8 + 3] & 0x02)
1651                 cdi->mask &= ~(CDC_CD_RW | CDC_RAM);
1652         if (buf[8 + 2] & 0x38)
1653                 cdi->mask &= ~CDC_DVD;
1654         if (buf[8 + 3] & 0x20)
1655                 cdi->mask &= ~(CDC_DVD_RAM | CDC_RAM);
1656         if (buf[8 + 3] & 0x10)
1657                 cdi->mask &= ~CDC_DVD_R;
1658         if ((buf[8 + 4] & 0x01) || (drive->atapi_flags & IDE_AFLAG_PLAY_AUDIO_OK))
1659                 cdi->mask &= ~CDC_PLAY_AUDIO;
1660
1661         mechtype = buf[8 + 6] >> 5;
1662         if (mechtype == mechtype_caddy || mechtype == mechtype_popup)
1663                 cdi->mask |= CDC_CLOSE_TRAY;
1664
1665         if (cdi->sanyo_slot > 0) {
1666                 cdi->mask &= ~CDC_SELECT_DISC;
1667                 nslots = 3;
1668         } else if (mechtype == mechtype_individual_changer ||
1669                    mechtype == mechtype_cartridge_changer) {
1670                 nslots = cdrom_number_of_slots(cdi);
1671                 if (nslots > 1)
1672                         cdi->mask &= ~CDC_SELECT_DISC;
1673         }
1674
1675         ide_cdrom_update_speed(drive, buf);
1676
1677         printk(KERN_INFO "%s: ATAPI", drive->name);
1678
1679         /* don't print speed if the drive reported 0 */
1680         if (cd->max_speed)
1681                 printk(KERN_CONT " %dX", cd->max_speed);
1682
1683         printk(KERN_CONT " %s", (cdi->mask & CDC_DVD) ? "CD-ROM" : "DVD-ROM");
1684
1685         if ((cdi->mask & CDC_DVD_R) == 0 || (cdi->mask & CDC_DVD_RAM) == 0)
1686                 printk(KERN_CONT " DVD%s%s",
1687                                  (cdi->mask & CDC_DVD_R) ? "" : "-R",
1688                                  (cdi->mask & CDC_DVD_RAM) ? "" : "-RAM");
1689
1690         if ((cdi->mask & CDC_CD_R) == 0 || (cdi->mask & CDC_CD_RW) == 0)
1691                 printk(KERN_CONT " CD%s%s",
1692                                  (cdi->mask & CDC_CD_R) ? "" : "-R",
1693                                  (cdi->mask & CDC_CD_RW) ? "" : "/RW");
1694
1695         if ((cdi->mask & CDC_SELECT_DISC) == 0)
1696                 printk(KERN_CONT " changer w/%d slots", nslots);
1697         else
1698                 printk(KERN_CONT " drive");
1699
1700         printk(KERN_CONT ", %dkB Cache\n", be16_to_cpup((__be16 *)&buf[8 + 12]));
1701
1702         return nslots;
1703 }
1704
1705 /* standard prep_rq_fn that builds 10 byte cmds */
1706 static int ide_cdrom_prep_fs(struct request_queue *q, struct request *rq)
1707 {
1708         int hard_sect = queue_hardsect_size(q);
1709         long block = (long)rq->hard_sector / (hard_sect >> 9);
1710         unsigned long blocks = rq->hard_nr_sectors / (hard_sect >> 9);
1711
1712         memset(rq->cmd, 0, BLK_MAX_CDB);
1713
1714         if (rq_data_dir(rq) == READ)
1715                 rq->cmd[0] = GPCMD_READ_10;
1716         else
1717                 rq->cmd[0] = GPCMD_WRITE_10;
1718
1719         /*
1720          * fill in lba
1721          */
1722         rq->cmd[2] = (block >> 24) & 0xff;
1723         rq->cmd[3] = (block >> 16) & 0xff;
1724         rq->cmd[4] = (block >>  8) & 0xff;
1725         rq->cmd[5] = block & 0xff;
1726
1727         /*
1728          * and transfer length
1729          */
1730         rq->cmd[7] = (blocks >> 8) & 0xff;
1731         rq->cmd[8] = blocks & 0xff;
1732         rq->cmd_len = 10;
1733         return BLKPREP_OK;
1734 }
1735
1736 /*
1737  * Most of the SCSI commands are supported directly by ATAPI devices.
1738  * This transform handles the few exceptions.
1739  */
1740 static int ide_cdrom_prep_pc(struct request *rq)
1741 {
1742         u8 *c = rq->cmd;
1743
1744         /* transform 6-byte read/write commands to the 10-byte version */
1745         if (c[0] == READ_6 || c[0] == WRITE_6) {
1746                 c[8] = c[4];
1747                 c[5] = c[3];
1748                 c[4] = c[2];
1749                 c[3] = c[1] & 0x1f;
1750                 c[2] = 0;
1751                 c[1] &= 0xe0;
1752                 c[0] += (READ_10 - READ_6);
1753                 rq->cmd_len = 10;
1754                 return BLKPREP_OK;
1755         }
1756
1757         /*
1758          * it's silly to pretend we understand 6-byte sense commands, just
1759          * reject with ILLEGAL_REQUEST and the caller should take the
1760          * appropriate action
1761          */
1762         if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
1763                 rq->errors = ILLEGAL_REQUEST;
1764                 return BLKPREP_KILL;
1765         }
1766
1767         return BLKPREP_OK;
1768 }
1769
1770 static int ide_cdrom_prep_fn(struct request_queue *q, struct request *rq)
1771 {
1772         if (blk_fs_request(rq))
1773                 return ide_cdrom_prep_fs(q, rq);
1774         else if (blk_pc_request(rq))
1775                 return ide_cdrom_prep_pc(rq);
1776
1777         return 0;
1778 }
1779
1780 struct cd_list_entry {
1781         const char      *id_model;
1782         const char      *id_firmware;
1783         unsigned int    cd_flags;
1784 };
1785
1786 #ifdef CONFIG_IDE_PROC_FS
1787 static sector_t ide_cdrom_capacity(ide_drive_t *drive)
1788 {
1789         unsigned long capacity, sectors_per_frame;
1790
1791         if (cdrom_read_capacity(drive, &capacity, &sectors_per_frame, NULL))
1792                 return 0;
1793
1794         return capacity * sectors_per_frame;
1795 }
1796
1797 static int proc_idecd_read_capacity(char *page, char **start, off_t off,
1798                                         int count, int *eof, void *data)
1799 {
1800         ide_drive_t *drive = data;
1801         int len;
1802
1803         len = sprintf(page, "%llu\n", (long long)ide_cdrom_capacity(drive));
1804         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
1805 }
1806
1807 static ide_proc_entry_t idecd_proc[] = {
1808         { "capacity", S_IFREG|S_IRUGO, proc_idecd_read_capacity, NULL },
1809         { NULL, 0, NULL, NULL }
1810 };
1811
1812 static void ide_cdrom_add_settings(ide_drive_t *drive)
1813 {
1814         ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1,
1815                         &drive->dsc_overlap, NULL);
1816 }
1817 #else
1818 static inline void ide_cdrom_add_settings(ide_drive_t *drive) { ; }
1819 #endif
1820
1821 static const struct cd_list_entry ide_cd_quirks_list[] = {
1822         /* Limit transfer size per interrupt. */
1823         { "SAMSUNG CD-ROM SCR-2430", NULL,   IDE_AFLAG_LIMIT_NFRAMES         },
1824         { "SAMSUNG CD-ROM SCR-2432", NULL,   IDE_AFLAG_LIMIT_NFRAMES         },
1825         /* SCR-3231 doesn't support the SET_CD_SPEED command. */
1826         { "SAMSUNG CD-ROM SCR-3231", NULL,   IDE_AFLAG_NO_SPEED_SELECT       },
1827         /* Old NEC260 (not R) was released before ATAPI 1.2 spec. */
1828         { "NEC CD-ROM DRIVE:260",    "1.01", IDE_AFLAG_TOCADDR_AS_BCD |
1829                                              IDE_AFLAG_PRE_ATAPI12,          },
1830         /* Vertos 300, some versions of this drive like to talk BCD. */
1831         { "V003S0DS",                NULL,   IDE_AFLAG_VERTOS_300_SSD,       },
1832         /* Vertos 600 ESD. */
1833         { "V006E0DS",                NULL,   IDE_AFLAG_VERTOS_600_ESD,       },
1834         /*
1835          * Sanyo 3 CD changer uses a non-standard command for CD changing
1836          * (by default standard ATAPI support for CD changers is used).
1837          */
1838         { "CD-ROM CDR-C3 G",         NULL,   IDE_AFLAG_SANYO_3CD             },
1839         { "CD-ROM CDR-C3G",          NULL,   IDE_AFLAG_SANYO_3CD             },
1840         { "CD-ROM CDR_C36",          NULL,   IDE_AFLAG_SANYO_3CD             },
1841         /* Stingray 8X CD-ROM. */
1842         { "STINGRAY 8422 IDE 8X CD-ROM 7-27-95", NULL, IDE_AFLAG_PRE_ATAPI12 },
1843         /*
1844          * ACER 50X CD-ROM and WPI 32X CD-ROM require the full spec length
1845          * mode sense page capabilities size, but older drives break.
1846          */
1847         { "ATAPI CD ROM DRIVE 50X MAX", NULL,   IDE_AFLAG_FULL_CAPS_PAGE     },
1848         { "WPI CDS-32X",                NULL,   IDE_AFLAG_FULL_CAPS_PAGE     },
1849         /* ACER/AOpen 24X CD-ROM has the speed fields byte-swapped. */
1850         { "",                        "241N", IDE_AFLAG_LE_SPEED_FIELDS       },
1851         /*
1852          * Some drives used by Apple don't advertise audio play
1853          * but they do support reading TOC & audio datas.
1854          */
1855         { "MATSHITADVD-ROM SR-8187", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1856         { "MATSHITADVD-ROM SR-8186", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1857         { "MATSHITADVD-ROM SR-8176", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1858         { "MATSHITADVD-ROM SR-8174", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1859         { "Optiarc DVD RW AD-5200A", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1860         { NULL, NULL, 0 }
1861 };
1862
1863 static unsigned int ide_cd_flags(struct hd_driveid *id)
1864 {
1865         const struct cd_list_entry *cle = ide_cd_quirks_list;
1866
1867         while (cle->id_model) {
1868                 if (strcmp(cle->id_model, id->model) == 0 &&
1869                     (cle->id_firmware == NULL ||
1870                      strstr(id->fw_rev, cle->id_firmware)))
1871                         return cle->cd_flags;
1872                 cle++;
1873         }
1874
1875         return 0;
1876 }
1877
1878 static int ide_cdrom_setup(ide_drive_t *drive)
1879 {
1880         struct cdrom_info *cd = drive->driver_data;
1881         struct cdrom_device_info *cdi = &cd->devinfo;
1882         struct hd_driveid *id = drive->id;
1883         int nslots;
1884
1885         blk_queue_prep_rq(drive->queue, ide_cdrom_prep_fn);
1886         blk_queue_dma_alignment(drive->queue, 31);
1887         blk_queue_update_dma_pad(drive->queue, 15);
1888         drive->queue->unplug_delay = (1 * HZ) / 1000;
1889         if (!drive->queue->unplug_delay)
1890                 drive->queue->unplug_delay = 1;
1891
1892         drive->special.all      = 0;
1893
1894         drive->atapi_flags = IDE_AFLAG_MEDIA_CHANGED | IDE_AFLAG_NO_EJECT |
1895                        ide_cd_flags(id);
1896
1897         if ((id->config & 0x0060) == 0x20)
1898                 drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
1899
1900         if ((drive->atapi_flags & IDE_AFLAG_VERTOS_300_SSD) &&
1901             id->fw_rev[4] == '1' && id->fw_rev[6] <= '2')
1902                 drive->atapi_flags |= (IDE_AFLAG_TOCTRACKS_AS_BCD |
1903                                      IDE_AFLAG_TOCADDR_AS_BCD);
1904         else if ((drive->atapi_flags & IDE_AFLAG_VERTOS_600_ESD) &&
1905                  id->fw_rev[4] == '1' && id->fw_rev[6] <= '2')
1906                 drive->atapi_flags |= IDE_AFLAG_TOCTRACKS_AS_BCD;
1907         else if (drive->atapi_flags & IDE_AFLAG_SANYO_3CD)
1908                 /* 3 => use CD in slot 0 */
1909                 cdi->sanyo_slot = 3;
1910
1911         nslots = ide_cdrom_probe_capabilities(drive);
1912
1913         /* set correct block size */
1914         blk_queue_hardsect_size(drive->queue, CD_FRAMESIZE);
1915
1916         drive->dsc_overlap = (drive->next != drive);
1917
1918         if (ide_cdrom_register(drive, nslots)) {
1919                 printk(KERN_ERR "%s: %s failed to register device with the"
1920                                 " cdrom driver.\n", drive->name, __func__);
1921                 cd->devinfo.handle = NULL;
1922                 return 1;
1923         }
1924         ide_cdrom_add_settings(drive);
1925         return 0;
1926 }
1927
1928 static void ide_cd_remove(ide_drive_t *drive)
1929 {
1930         struct cdrom_info *info = drive->driver_data;
1931
1932         ide_proc_unregister_driver(drive, info->driver);
1933
1934         del_gendisk(info->disk);
1935
1936         ide_cd_put(info);
1937 }
1938
1939 static void ide_cd_release(struct kref *kref)
1940 {
1941         struct cdrom_info *info = to_ide_cd(kref);
1942         struct cdrom_device_info *devinfo = &info->devinfo;
1943         ide_drive_t *drive = info->drive;
1944         struct gendisk *g = info->disk;
1945
1946         kfree(info->toc);
1947         if (devinfo->handle == drive)
1948                 unregister_cdrom(devinfo);
1949         drive->dsc_overlap = 0;
1950         drive->driver_data = NULL;
1951         blk_queue_prep_rq(drive->queue, NULL);
1952         g->private_data = NULL;
1953         put_disk(g);
1954         kfree(info);
1955 }
1956
1957 static int ide_cd_probe(ide_drive_t *);
1958
1959 static ide_driver_t ide_cdrom_driver = {
1960         .gen_driver = {
1961                 .owner          = THIS_MODULE,
1962                 .name           = "ide-cdrom",
1963                 .bus            = &ide_bus_type,
1964         },
1965         .probe                  = ide_cd_probe,
1966         .remove                 = ide_cd_remove,
1967         .version                = IDECD_VERSION,
1968         .media                  = ide_cdrom,
1969         .supports_dsc_overlap   = 1,
1970         .do_request             = ide_cd_do_request,
1971         .end_request            = ide_end_request,
1972         .error                  = __ide_error,
1973 #ifdef CONFIG_IDE_PROC_FS
1974         .proc                   = idecd_proc,
1975 #endif
1976 };
1977
1978 static int idecd_open(struct inode *inode, struct file *file)
1979 {
1980         struct gendisk *disk = inode->i_bdev->bd_disk;
1981         struct cdrom_info *info;
1982         int rc = -ENOMEM;
1983
1984         info = ide_cd_get(disk);
1985         if (!info)
1986                 return -ENXIO;
1987
1988         rc = cdrom_open(&info->devinfo, inode, file);
1989
1990         if (rc < 0)
1991                 ide_cd_put(info);
1992
1993         return rc;
1994 }
1995
1996 static int idecd_release(struct inode *inode, struct file *file)
1997 {
1998         struct gendisk *disk = inode->i_bdev->bd_disk;
1999         struct cdrom_info *info = ide_cd_g(disk);
2000
2001         cdrom_release(&info->devinfo, file);
2002
2003         ide_cd_put(info);
2004
2005         return 0;
2006 }
2007
2008 static int idecd_set_spindown(struct cdrom_device_info *cdi, unsigned long arg)
2009 {
2010         struct packet_command cgc;
2011         char buffer[16];
2012         int stat;
2013         char spindown;
2014
2015         if (copy_from_user(&spindown, (void __user *)arg, sizeof(char)))
2016                 return -EFAULT;
2017
2018         init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_UNKNOWN);
2019
2020         stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CDROM_PAGE, 0);
2021         if (stat)
2022                 return stat;
2023
2024         buffer[11] = (buffer[11] & 0xf0) | (spindown & 0x0f);
2025         return cdrom_mode_select(cdi, &cgc);
2026 }
2027
2028 static int idecd_get_spindown(struct cdrom_device_info *cdi, unsigned long arg)
2029 {
2030         struct packet_command cgc;
2031         char buffer[16];
2032         int stat;
2033         char spindown;
2034
2035         init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_UNKNOWN);
2036
2037         stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CDROM_PAGE, 0);
2038         if (stat)
2039                 return stat;
2040
2041         spindown = buffer[11] & 0x0f;
2042         if (copy_to_user((void __user *)arg, &spindown, sizeof(char)))
2043                 return -EFAULT;
2044         return 0;
2045 }
2046
2047 static int idecd_ioctl(struct inode *inode, struct file *file,
2048                         unsigned int cmd, unsigned long arg)
2049 {
2050         struct block_device *bdev = inode->i_bdev;
2051         struct cdrom_info *info = ide_cd_g(bdev->bd_disk);
2052         int err;
2053
2054         switch (cmd) {
2055         case CDROMSETSPINDOWN:
2056                 return idecd_set_spindown(&info->devinfo, arg);
2057         case CDROMGETSPINDOWN:
2058                 return idecd_get_spindown(&info->devinfo, arg);
2059         default:
2060                 break;
2061         }
2062
2063         err = generic_ide_ioctl(info->drive, file, bdev, cmd, arg);
2064         if (err == -EINVAL)
2065                 err = cdrom_ioctl(file, &info->devinfo, inode, cmd, arg);
2066
2067         return err;
2068 }
2069
2070 static int idecd_media_changed(struct gendisk *disk)
2071 {
2072         struct cdrom_info *info = ide_cd_g(disk);
2073         return cdrom_media_changed(&info->devinfo);
2074 }
2075
2076 static int idecd_revalidate_disk(struct gendisk *disk)
2077 {
2078         struct cdrom_info *info = ide_cd_g(disk);
2079         struct request_sense sense;
2080
2081         ide_cd_read_toc(info->drive, &sense);
2082
2083         return  0;
2084 }
2085
2086 static struct block_device_operations idecd_ops = {
2087         .owner                  = THIS_MODULE,
2088         .open                   = idecd_open,
2089         .release                = idecd_release,
2090         .ioctl                  = idecd_ioctl,
2091         .media_changed          = idecd_media_changed,
2092         .revalidate_disk        = idecd_revalidate_disk
2093 };
2094
2095 /* module options */
2096 static char *ignore;
2097
2098 module_param(ignore, charp, 0400);
2099 MODULE_DESCRIPTION("ATAPI CD-ROM Driver");
2100
2101 static int ide_cd_probe(ide_drive_t *drive)
2102 {
2103         struct cdrom_info *info;
2104         struct gendisk *g;
2105         struct request_sense sense;
2106
2107         if (!strstr("ide-cdrom", drive->driver_req))
2108                 goto failed;
2109         if (!drive->present)
2110                 goto failed;
2111         if (drive->media != ide_cdrom && drive->media != ide_optical)
2112                 goto failed;
2113         /* skip drives that we were told to ignore */
2114         if (ignore != NULL) {
2115                 if (strstr(ignore, drive->name)) {
2116                         printk(KERN_INFO "ide-cd: ignoring drive %s\n",
2117                                          drive->name);
2118                         goto failed;
2119                 }
2120         }
2121         info = kzalloc(sizeof(struct cdrom_info), GFP_KERNEL);
2122         if (info == NULL) {
2123                 printk(KERN_ERR "%s: Can't allocate a cdrom structure\n",
2124                                 drive->name);
2125                 goto failed;
2126         }
2127
2128         g = alloc_disk(1 << PARTN_BITS);
2129         if (!g)
2130                 goto out_free_cd;
2131
2132         ide_init_disk(g, drive);
2133
2134         ide_proc_register_driver(drive, &ide_cdrom_driver);
2135
2136         kref_init(&info->kref);
2137
2138         info->drive = drive;
2139         info->driver = &ide_cdrom_driver;
2140         info->disk = g;
2141
2142         g->private_data = &info->driver;
2143
2144         drive->driver_data = info;
2145
2146         g->minors = 1;
2147         g->driverfs_dev = &drive->gendev;
2148         g->flags = GENHD_FL_CD | GENHD_FL_REMOVABLE;
2149         if (ide_cdrom_setup(drive)) {
2150                 ide_proc_unregister_driver(drive, &ide_cdrom_driver);
2151                 ide_cd_release(&info->kref);
2152                 goto failed;
2153         }
2154
2155         ide_cd_read_toc(drive, &sense);
2156         g->fops = &idecd_ops;
2157         g->flags |= GENHD_FL_REMOVABLE;
2158         add_disk(g);
2159         return 0;
2160
2161 out_free_cd:
2162         kfree(info);
2163 failed:
2164         return -ENODEV;
2165 }
2166
2167 static void __exit ide_cdrom_exit(void)
2168 {
2169         driver_unregister(&ide_cdrom_driver.gen_driver);
2170 }
2171
2172 static int __init ide_cdrom_init(void)
2173 {
2174         return driver_register(&ide_cdrom_driver.gen_driver);
2175 }
2176
2177 MODULE_ALIAS("ide:*m-cdrom*");
2178 MODULE_ALIAS("ide-cd");
2179 module_init(ide_cdrom_init);
2180 module_exit(ide_cdrom_exit);
2181 MODULE_LICENSE("GPL");