const: make block_device_operations const
[linux-3.10.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, 2007-2009  Bartlomiej Zolnierkiewicz
8  *
9  * May be copied or modified under the terms of the GNU General Public
10  * License.  See linux/COPYING for more information.
11  *
12  * See Documentation/cdrom/ide-cd for usage information.
13  *
14  * Suggestions are welcome. Patches that work are more welcome though. ;-)
15  *
16  * Documentation:
17  *      Mt. Fuji (SFF8090 version 4) and ATAPI (SFF-8020i rev 2.6) standards.
18  *
19  * For historical changelog please see:
20  *      Documentation/ide/ChangeLog.ide-cd.1994-2004
21  */
22
23 #define DRV_NAME "ide-cd"
24 #define PFX DRV_NAME ": "
25
26 #define IDECD_VERSION "5.00"
27
28 #include <linux/module.h>
29 #include <linux/types.h>
30 #include <linux/kernel.h>
31 #include <linux/delay.h>
32 #include <linux/timer.h>
33 #include <linux/seq_file.h>
34 #include <linux/slab.h>
35 #include <linux/interrupt.h>
36 #include <linux/errno.h>
37 #include <linux/cdrom.h>
38 #include <linux/ide.h>
39 #include <linux/completion.h>
40 #include <linux/mutex.h>
41 #include <linux/bcd.h>
42
43 /* For SCSI -> ATAPI command conversion */
44 #include <scsi/scsi.h>
45
46 #include <linux/irq.h>
47 #include <linux/io.h>
48 #include <asm/byteorder.h>
49 #include <linux/uaccess.h>
50 #include <asm/unaligned.h>
51
52 #include "ide-cd.h"
53
54 static DEFINE_MUTEX(idecd_ref_mutex);
55
56 static void ide_cd_release(struct device *);
57
58 static struct cdrom_info *ide_cd_get(struct gendisk *disk)
59 {
60         struct cdrom_info *cd = NULL;
61
62         mutex_lock(&idecd_ref_mutex);
63         cd = ide_drv_g(disk, cdrom_info);
64         if (cd) {
65                 if (ide_device_get(cd->drive))
66                         cd = NULL;
67                 else
68                         get_device(&cd->dev);
69
70         }
71         mutex_unlock(&idecd_ref_mutex);
72         return cd;
73 }
74
75 static void ide_cd_put(struct cdrom_info *cd)
76 {
77         ide_drive_t *drive = cd->drive;
78
79         mutex_lock(&idecd_ref_mutex);
80         put_device(&cd->dev);
81         ide_device_put(drive);
82         mutex_unlock(&idecd_ref_mutex);
83 }
84
85 /*
86  * Generic packet command support and error handling routines.
87  */
88
89 /* Mark that we've seen a media change and invalidate our internal buffers. */
90 static void cdrom_saw_media_change(ide_drive_t *drive)
91 {
92         drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;
93         drive->atapi_flags &= ~IDE_AFLAG_TOC_VALID;
94 }
95
96 static int cdrom_log_sense(ide_drive_t *drive, struct request *rq)
97 {
98         struct request_sense *sense = &drive->sense_data;
99         int log = 0;
100
101         if (!sense || !rq || (rq->cmd_flags & REQ_QUIET))
102                 return 0;
103
104         ide_debug_log(IDE_DBG_SENSE, "sense_key: 0x%x", sense->sense_key);
105
106         switch (sense->sense_key) {
107         case NO_SENSE:
108         case RECOVERED_ERROR:
109                 break;
110         case NOT_READY:
111                 /*
112                  * don't care about tray state messages for e.g. capacity
113                  * commands or in-progress or becoming ready
114                  */
115                 if (sense->asc == 0x3a || sense->asc == 0x04)
116                         break;
117                 log = 1;
118                 break;
119         case ILLEGAL_REQUEST:
120                 /*
121                  * don't log START_STOP unit with LoEj set, since we cannot
122                  * reliably check if drive can auto-close
123                  */
124                 if (rq->cmd[0] == GPCMD_START_STOP_UNIT && sense->asc == 0x24)
125                         break;
126                 log = 1;
127                 break;
128         case UNIT_ATTENTION:
129                 /*
130                  * Make good and sure we've seen this potential media change.
131                  * Some drives (i.e. Creative) fail to present the correct sense
132                  * key in the error register.
133                  */
134                 cdrom_saw_media_change(drive);
135                 break;
136         default:
137                 log = 1;
138                 break;
139         }
140         return log;
141 }
142
143 static void cdrom_analyze_sense_data(ide_drive_t *drive,
144                                      struct request *failed_command)
145 {
146         struct request_sense *sense = &drive->sense_data;
147         struct cdrom_info *info = drive->driver_data;
148         unsigned long sector;
149         unsigned long bio_sectors;
150
151         ide_debug_log(IDE_DBG_SENSE, "error_code: 0x%x, sense_key: 0x%x",
152                                      sense->error_code, sense->sense_key);
153
154         if (failed_command)
155                 ide_debug_log(IDE_DBG_SENSE, "failed cmd: 0x%x",
156                                              failed_command->cmd[0]);
157
158         if (!cdrom_log_sense(drive, failed_command))
159                 return;
160
161         /*
162          * If a read toc is executed for a CD-R or CD-RW medium where the first
163          * toc has not been recorded yet, it will fail with 05/24/00 (which is a
164          * confusing error)
165          */
166         if (failed_command && failed_command->cmd[0] == GPCMD_READ_TOC_PMA_ATIP)
167                 if (sense->sense_key == 0x05 && sense->asc == 0x24)
168                         return;
169
170         /* current error */
171         if (sense->error_code == 0x70) {
172                 switch (sense->sense_key) {
173                 case MEDIUM_ERROR:
174                 case VOLUME_OVERFLOW:
175                 case ILLEGAL_REQUEST:
176                         if (!sense->valid)
177                                 break;
178                         if (failed_command == NULL ||
179                                         !blk_fs_request(failed_command))
180                                 break;
181                         sector = (sense->information[0] << 24) |
182                                  (sense->information[1] << 16) |
183                                  (sense->information[2] <<  8) |
184                                  (sense->information[3]);
185
186                         if (queue_logical_block_size(drive->queue) == 2048)
187                                 /* device sector size is 2K */
188                                 sector <<= 2;
189
190                         bio_sectors = max(bio_sectors(failed_command->bio), 4U);
191                         sector &= ~(bio_sectors - 1);
192
193                         /*
194                          * The SCSI specification allows for the value
195                          * returned by READ CAPACITY to be up to 75 2K
196                          * sectors past the last readable block.
197                          * Therefore, if we hit a medium error within the
198                          * last 75 2K sectors, we decrease the saved size
199                          * value.
200                          */
201                         if (sector < get_capacity(info->disk) &&
202                             drive->probed_capacity - sector < 4 * 75)
203                                 set_capacity(info->disk, sector);
204                 }
205         }
206
207         ide_cd_log_error(drive->name, failed_command, sense);
208 }
209
210 static void ide_cd_complete_failed_rq(ide_drive_t *drive, struct request *rq)
211 {
212         /*
213          * For REQ_TYPE_SENSE, "rq->special" points to the original
214          * failed request.  Also, the sense data should be read
215          * directly from rq which might be different from the original
216          * sense buffer if it got copied during mapping.
217          */
218         struct request *failed = (struct request *)rq->special;
219         void *sense = bio_data(rq->bio);
220
221         if (failed) {
222                 if (failed->sense) {
223                         /*
224                          * Sense is always read into drive->sense_data.
225                          * Copy back if the failed request has its
226                          * sense pointer set.
227                          */
228                         memcpy(failed->sense, sense, 18);
229                         failed->sense_len = rq->sense_len;
230                 }
231                 cdrom_analyze_sense_data(drive, failed);
232
233                 if (ide_end_rq(drive, failed, -EIO, blk_rq_bytes(failed)))
234                         BUG();
235         } else
236                 cdrom_analyze_sense_data(drive, NULL);
237 }
238
239
240 /*
241  * Allow the drive 5 seconds to recover; some devices will return NOT_READY
242  * while flushing data from cache.
243  *
244  * returns: 0 failed (write timeout expired)
245  *          1 success
246  */
247 static int ide_cd_breathe(ide_drive_t *drive, struct request *rq)
248 {
249
250         struct cdrom_info *info = drive->driver_data;
251
252         if (!rq->errors)
253                 info->write_timeout = jiffies + ATAPI_WAIT_WRITE_BUSY;
254
255         rq->errors = 1;
256
257         if (time_after(jiffies, info->write_timeout))
258                 return 0;
259         else {
260                 struct request_queue *q = drive->queue;
261                 unsigned long flags;
262
263                 /*
264                  * take a breather relying on the unplug timer to kick us again
265                  */
266
267                 spin_lock_irqsave(q->queue_lock, flags);
268                 blk_plug_device(q);
269                 spin_unlock_irqrestore(q->queue_lock, flags);
270
271                 return 1;
272         }
273 }
274
275 /**
276  * Returns:
277  * 0: if the request should be continued.
278  * 1: if the request will be going through error recovery.
279  * 2: if the request should be ended.
280  */
281 static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
282 {
283         ide_hwif_t *hwif = drive->hwif;
284         struct request *rq = hwif->rq;
285         int err, sense_key, do_end_request = 0;
286
287         /* get the IDE error register */
288         err = ide_read_error(drive);
289         sense_key = err >> 4;
290
291         ide_debug_log(IDE_DBG_RQ, "cmd: 0x%x, rq->cmd_type: 0x%x, err: 0x%x, "
292                                   "stat 0x%x",
293                                   rq->cmd[0], rq->cmd_type, err, stat);
294
295         if (blk_sense_request(rq)) {
296                 /*
297                  * We got an error trying to get sense info from the drive
298                  * (probably while trying to recover from a former error).
299                  * Just give up.
300                  */
301                 rq->cmd_flags |= REQ_FAILED;
302                 return 2;
303         }
304
305         /* if we have an error, pass CHECK_CONDITION as the SCSI status byte */
306         if (blk_pc_request(rq) && !rq->errors)
307                 rq->errors = SAM_STAT_CHECK_CONDITION;
308
309         if (blk_noretry_request(rq))
310                 do_end_request = 1;
311
312         switch (sense_key) {
313         case NOT_READY:
314                 if (blk_fs_request(rq) && rq_data_dir(rq) == WRITE) {
315                         if (ide_cd_breathe(drive, rq))
316                                 return 1;
317                 } else {
318                         cdrom_saw_media_change(drive);
319
320                         if (blk_fs_request(rq) && !blk_rq_quiet(rq))
321                                 printk(KERN_ERR PFX "%s: tray open\n",
322                                         drive->name);
323                 }
324                 do_end_request = 1;
325                 break;
326         case UNIT_ATTENTION:
327                 cdrom_saw_media_change(drive);
328
329                 if (blk_fs_request(rq) == 0)
330                         return 0;
331
332                 /*
333                  * Arrange to retry the request but be sure to give up if we've
334                  * retried too many times.
335                  */
336                 if (++rq->errors > ERROR_MAX)
337                         do_end_request = 1;
338                 break;
339         case ILLEGAL_REQUEST:
340                 /*
341                  * Don't print error message for this condition -- SFF8090i
342                  * indicates that 5/24/00 is the correct response to a request
343                  * to close the tray if the drive doesn't have that capability.
344                  *
345                  * cdrom_log_sense() knows this!
346                  */
347                 if (rq->cmd[0] == GPCMD_START_STOP_UNIT)
348                         break;
349                 /* fall-through */
350         case DATA_PROTECT:
351                 /*
352                  * No point in retrying after an illegal request or data
353                  * protect error.
354                  */
355                 if (!blk_rq_quiet(rq))
356                         ide_dump_status(drive, "command error", stat);
357                 do_end_request = 1;
358                 break;
359         case MEDIUM_ERROR:
360                 /*
361                  * No point in re-trying a zillion times on a bad sector.
362                  * If we got here the error is not correctable.
363                  */
364                 if (!blk_rq_quiet(rq))
365                         ide_dump_status(drive, "media error "
366                                         "(bad sector)", stat);
367                 do_end_request = 1;
368                 break;
369         case BLANK_CHECK:
370                 /* disk appears blank? */
371                 if (!blk_rq_quiet(rq))
372                         ide_dump_status(drive, "media error (blank)",
373                                         stat);
374                 do_end_request = 1;
375                 break;
376         default:
377                 if (blk_fs_request(rq) == 0)
378                         break;
379                 if (err & ~ATA_ABORTED) {
380                         /* go to the default handler for other errors */
381                         ide_error(drive, "cdrom_decode_status", stat);
382                         return 1;
383                 } else if (++rq->errors > ERROR_MAX)
384                         /* we've racked up too many retries, abort */
385                         do_end_request = 1;
386         }
387
388         if (blk_fs_request(rq) == 0) {
389                 rq->cmd_flags |= REQ_FAILED;
390                 do_end_request = 1;
391         }
392
393         /*
394          * End a request through request sense analysis when we have sense data.
395          * We need this in order to perform end of media processing.
396          */
397         if (do_end_request)
398                 goto end_request;
399
400         /* if we got a CHECK_CONDITION status, queue a request sense command */
401         if (stat & ATA_ERR)
402                 return ide_queue_sense_rq(drive, NULL) ? 2 : 1;
403         return 1;
404
405 end_request:
406         if (stat & ATA_ERR) {
407                 hwif->rq = NULL;
408                 return ide_queue_sense_rq(drive, rq) ? 2 : 1;
409         } else
410                 return 2;
411 }
412
413 static void ide_cd_request_sense_fixup(ide_drive_t *drive, struct ide_cmd *cmd)
414 {
415         struct request *rq = cmd->rq;
416
417         ide_debug_log(IDE_DBG_FUNC, "rq->cmd[0]: 0x%x", rq->cmd[0]);
418
419         /*
420          * Some of the trailing request sense fields are optional,
421          * and some drives don't send them.  Sigh.
422          */
423         if (rq->cmd[0] == GPCMD_REQUEST_SENSE &&
424             cmd->nleft > 0 && cmd->nleft <= 5)
425                 cmd->nleft = 0;
426 }
427
428 int ide_cd_queue_pc(ide_drive_t *drive, const unsigned char *cmd,
429                     int write, void *buffer, unsigned *bufflen,
430                     struct request_sense *sense, int timeout,
431                     unsigned int cmd_flags)
432 {
433         struct cdrom_info *info = drive->driver_data;
434         struct request_sense local_sense;
435         int retries = 10;
436         unsigned int flags = 0;
437
438         if (!sense)
439                 sense = &local_sense;
440
441         ide_debug_log(IDE_DBG_PC, "cmd[0]: 0x%x, write: 0x%x, timeout: %d, "
442                                   "cmd_flags: 0x%x",
443                                   cmd[0], write, timeout, cmd_flags);
444
445         /* start of retry loop */
446         do {
447                 struct request *rq;
448                 int error;
449
450                 rq = blk_get_request(drive->queue, write, __GFP_WAIT);
451
452                 memcpy(rq->cmd, cmd, BLK_MAX_CDB);
453                 rq->cmd_type = REQ_TYPE_ATA_PC;
454                 rq->sense = sense;
455                 rq->cmd_flags |= cmd_flags;
456                 rq->timeout = timeout;
457                 if (buffer) {
458                         error = blk_rq_map_kern(drive->queue, rq, buffer,
459                                                 *bufflen, GFP_NOIO);
460                         if (error) {
461                                 blk_put_request(rq);
462                                 return error;
463                         }
464                 }
465
466                 error = blk_execute_rq(drive->queue, info->disk, rq, 0);
467
468                 if (buffer)
469                         *bufflen = rq->resid_len;
470
471                 flags = rq->cmd_flags;
472                 blk_put_request(rq);
473
474                 /*
475                  * FIXME: we should probably abort/retry or something in case of
476                  * failure.
477                  */
478                 if (flags & REQ_FAILED) {
479                         /*
480                          * The request failed.  Retry if it was due to a unit
481                          * attention status (usually means media was changed).
482                          */
483                         struct request_sense *reqbuf = sense;
484
485                         if (reqbuf->sense_key == UNIT_ATTENTION)
486                                 cdrom_saw_media_change(drive);
487                         else if (reqbuf->sense_key == NOT_READY &&
488                                  reqbuf->asc == 4 && reqbuf->ascq != 4) {
489                                 /*
490                                  * The drive is in the process of loading
491                                  * a disk.  Retry, but wait a little to give
492                                  * the drive time to complete the load.
493                                  */
494                                 ssleep(2);
495                         } else {
496                                 /* otherwise, don't retry */
497                                 retries = 0;
498                         }
499                         --retries;
500                 }
501
502                 /* end of retry loop */
503         } while ((flags & REQ_FAILED) && retries >= 0);
504
505         /* return an error if the command failed */
506         return (flags & REQ_FAILED) ? -EIO : 0;
507 }
508
509 static void ide_cd_error_cmd(ide_drive_t *drive, struct ide_cmd *cmd)
510 {
511         unsigned int nr_bytes = cmd->nbytes - cmd->nleft;
512
513         if (cmd->tf_flags & IDE_TFLAG_WRITE)
514                 nr_bytes -= cmd->last_xfer_len;
515
516         if (nr_bytes > 0)
517                 ide_complete_rq(drive, 0, nr_bytes);
518 }
519
520 static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
521 {
522         ide_hwif_t *hwif = drive->hwif;
523         struct ide_cmd *cmd = &hwif->cmd;
524         struct request *rq = hwif->rq;
525         ide_expiry_t *expiry = NULL;
526         int dma_error = 0, dma, thislen, uptodate = 0;
527         int write = (rq_data_dir(rq) == WRITE) ? 1 : 0, rc = 0;
528         int sense = blk_sense_request(rq);
529         unsigned int timeout;
530         u16 len;
531         u8 ireason, stat;
532
533         ide_debug_log(IDE_DBG_PC, "cmd: 0x%x, write: 0x%x", rq->cmd[0], write);
534
535         /* check for errors */
536         dma = drive->dma;
537         if (dma) {
538                 drive->dma = 0;
539                 drive->waiting_for_dma = 0;
540                 dma_error = hwif->dma_ops->dma_end(drive);
541                 ide_dma_unmap_sg(drive, cmd);
542                 if (dma_error) {
543                         printk(KERN_ERR PFX "%s: DMA %s error\n", drive->name,
544                                         write ? "write" : "read");
545                         ide_dma_off(drive);
546                 }
547         }
548
549         /* check status */
550         stat = hwif->tp_ops->read_status(hwif);
551
552         if (!OK_STAT(stat, 0, BAD_R_STAT)) {
553                 rc = cdrom_decode_status(drive, stat);
554                 if (rc) {
555                         if (rc == 2)
556                                 goto out_end;
557                         return ide_stopped;
558                 }
559         }
560
561         /* using dma, transfer is complete now */
562         if (dma) {
563                 if (dma_error)
564                         return ide_error(drive, "dma error", stat);
565                 uptodate = 1;
566                 goto out_end;
567         }
568
569         ide_read_bcount_and_ireason(drive, &len, &ireason);
570
571         thislen = blk_fs_request(rq) ? len : cmd->nleft;
572         if (thislen > len)
573                 thislen = len;
574
575         ide_debug_log(IDE_DBG_PC, "DRQ: stat: 0x%x, thislen: %d",
576                                   stat, thislen);
577
578         /* If DRQ is clear, the command has completed. */
579         if ((stat & ATA_DRQ) == 0) {
580                 if (blk_fs_request(rq)) {
581                         /*
582                          * If we're not done reading/writing, complain.
583                          * Otherwise, complete the command normally.
584                          */
585                         uptodate = 1;
586                         if (cmd->nleft > 0) {
587                                 printk(KERN_ERR PFX "%s: %s: data underrun "
588                                         "(%u bytes)\n", drive->name, __func__,
589                                         cmd->nleft);
590                                 if (!write)
591                                         rq->cmd_flags |= REQ_FAILED;
592                                 uptodate = 0;
593                         }
594                 } else if (!blk_pc_request(rq)) {
595                         ide_cd_request_sense_fixup(drive, cmd);
596
597                         uptodate = cmd->nleft ? 0 : 1;
598
599                         /*
600                          * suck out the remaining bytes from the drive in an
601                          * attempt to complete the data xfer. (see BZ#13399)
602                          */
603                         if (!(stat & ATA_ERR) && !uptodate && thislen) {
604                                 ide_pio_bytes(drive, cmd, write, thislen);
605                                 uptodate = cmd->nleft ? 0 : 1;
606                         }
607
608                         if (!uptodate)
609                                 rq->cmd_flags |= REQ_FAILED;
610                 }
611                 goto out_end;
612         }
613
614         rc = ide_check_ireason(drive, rq, len, ireason, write);
615         if (rc)
616                 goto out_end;
617
618         cmd->last_xfer_len = 0;
619
620         ide_debug_log(IDE_DBG_PC, "data transfer, rq->cmd_type: 0x%x, "
621                                   "ireason: 0x%x",
622                                   rq->cmd_type, ireason);
623
624         /* transfer data */
625         while (thislen > 0) {
626                 int blen = min_t(int, thislen, cmd->nleft);
627
628                 if (cmd->nleft == 0)
629                         break;
630
631                 ide_pio_bytes(drive, cmd, write, blen);
632                 cmd->last_xfer_len += blen;
633
634                 thislen -= blen;
635                 len -= blen;
636
637                 if (sense && write == 0)
638                         rq->sense_len += blen;
639         }
640
641         /* pad, if necessary */
642         if (len > 0) {
643                 if (blk_fs_request(rq) == 0 || write == 0)
644                         ide_pad_transfer(drive, write, len);
645                 else {
646                         printk(KERN_ERR PFX "%s: confused, missing data\n",
647                                 drive->name);
648                         blk_dump_rq_flags(rq, "cdrom_newpc_intr");
649                 }
650         }
651
652         if (blk_pc_request(rq)) {
653                 timeout = rq->timeout;
654         } else {
655                 timeout = ATAPI_WAIT_PC;
656                 if (!blk_fs_request(rq))
657                         expiry = ide_cd_expiry;
658         }
659
660         hwif->expiry = expiry;
661         ide_set_handler(drive, cdrom_newpc_intr, timeout);
662         return ide_started;
663
664 out_end:
665         if (blk_pc_request(rq) && rc == 0) {
666                 rq->resid_len = 0;
667                 blk_end_request_all(rq, 0);
668                 hwif->rq = NULL;
669         } else {
670                 if (sense && uptodate)
671                         ide_cd_complete_failed_rq(drive, rq);
672
673                 if (blk_fs_request(rq)) {
674                         if (cmd->nleft == 0)
675                                 uptodate = 1;
676                 } else {
677                         if (uptodate <= 0 && rq->errors == 0)
678                                 rq->errors = -EIO;
679                 }
680
681                 if (uptodate == 0 && rq->bio)
682                         ide_cd_error_cmd(drive, cmd);
683
684                 /* make sure it's fully ended */
685                 if (blk_fs_request(rq) == 0) {
686                         rq->resid_len -= cmd->nbytes - cmd->nleft;
687                         if (uptodate == 0 && (cmd->tf_flags & IDE_TFLAG_WRITE))
688                                 rq->resid_len += cmd->last_xfer_len;
689                 }
690
691                 ide_complete_rq(drive, uptodate ? 0 : -EIO, blk_rq_bytes(rq));
692
693                 if (sense && rc == 2)
694                         ide_error(drive, "request sense failure", stat);
695         }
696         return ide_stopped;
697 }
698
699 static ide_startstop_t cdrom_start_rw(ide_drive_t *drive, struct request *rq)
700 {
701         struct cdrom_info *cd = drive->driver_data;
702         struct request_queue *q = drive->queue;
703         int write = rq_data_dir(rq) == WRITE;
704         unsigned short sectors_per_frame =
705                 queue_logical_block_size(q) >> SECTOR_BITS;
706
707         ide_debug_log(IDE_DBG_RQ, "rq->cmd[0]: 0x%x, rq->cmd_flags: 0x%x, "
708                                   "secs_per_frame: %u",
709                                   rq->cmd[0], rq->cmd_flags, sectors_per_frame);
710
711         if (write) {
712                 /* disk has become write protected */
713                 if (get_disk_ro(cd->disk))
714                         return ide_stopped;
715         } else {
716                 /*
717                  * We may be retrying this request after an error.  Fix up any
718                  * weirdness which might be present in the request packet.
719                  */
720                 q->prep_rq_fn(q, rq);
721         }
722
723         /* fs requests *must* be hardware frame aligned */
724         if ((blk_rq_sectors(rq) & (sectors_per_frame - 1)) ||
725             (blk_rq_pos(rq) & (sectors_per_frame - 1)))
726                 return ide_stopped;
727
728         /* use DMA, if possible */
729         drive->dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
730
731         if (write)
732                 cd->devinfo.media_written = 1;
733
734         rq->timeout = ATAPI_WAIT_PC;
735
736         return ide_started;
737 }
738
739 static void cdrom_do_block_pc(ide_drive_t *drive, struct request *rq)
740 {
741
742         ide_debug_log(IDE_DBG_PC, "rq->cmd[0]: 0x%x, rq->cmd_type: 0x%x",
743                                   rq->cmd[0], rq->cmd_type);
744
745         if (blk_pc_request(rq))
746                 rq->cmd_flags |= REQ_QUIET;
747         else
748                 rq->cmd_flags &= ~REQ_FAILED;
749
750         drive->dma = 0;
751
752         /* sg request */
753         if (rq->bio) {
754                 struct request_queue *q = drive->queue;
755                 char *buf = bio_data(rq->bio);
756                 unsigned int alignment;
757
758                 drive->dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
759
760                 /*
761                  * check if dma is safe
762                  *
763                  * NOTE! The "len" and "addr" checks should possibly have
764                  * separate masks.
765                  */
766                 alignment = queue_dma_alignment(q) | q->dma_pad_mask;
767                 if ((unsigned long)buf & alignment
768                     || blk_rq_bytes(rq) & q->dma_pad_mask
769                     || object_is_on_stack(buf))
770                         drive->dma = 0;
771         }
772 }
773
774 static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
775                                         sector_t block)
776 {
777         struct ide_cmd cmd;
778         int uptodate = 0, nsectors;
779
780         ide_debug_log(IDE_DBG_RQ, "cmd: 0x%x, block: %llu",
781                                   rq->cmd[0], (unsigned long long)block);
782
783         if (drive->debug_mask & IDE_DBG_RQ)
784                 blk_dump_rq_flags(rq, "ide_cd_do_request");
785
786         if (blk_fs_request(rq)) {
787                 if (cdrom_start_rw(drive, rq) == ide_stopped)
788                         goto out_end;
789         } else if (blk_sense_request(rq) || blk_pc_request(rq) ||
790                    rq->cmd_type == REQ_TYPE_ATA_PC) {
791                 if (!rq->timeout)
792                         rq->timeout = ATAPI_WAIT_PC;
793
794                 cdrom_do_block_pc(drive, rq);
795         } else if (blk_special_request(rq)) {
796                 /* right now this can only be a reset... */
797                 uptodate = 1;
798                 goto out_end;
799         } else
800                 BUG();
801
802         /* prepare sense request for this command */
803         ide_prep_sense(drive, rq);
804
805         memset(&cmd, 0, sizeof(cmd));
806
807         if (rq_data_dir(rq))
808                 cmd.tf_flags |= IDE_TFLAG_WRITE;
809
810         cmd.rq = rq;
811
812         if (blk_fs_request(rq) || blk_rq_bytes(rq)) {
813                 ide_init_sg_cmd(&cmd, blk_rq_bytes(rq));
814                 ide_map_sg(drive, &cmd);
815         }
816
817         return ide_issue_pc(drive, &cmd);
818 out_end:
819         nsectors = blk_rq_sectors(rq);
820
821         if (nsectors == 0)
822                 nsectors = 1;
823
824         ide_complete_rq(drive, uptodate ? 0 : -EIO, nsectors << 9);
825
826         return ide_stopped;
827 }
828
829 /*
830  * Ioctl handling.
831  *
832  * Routines which queue packet commands take as a final argument a pointer to a
833  * request_sense struct. If execution of the command results in an error with a
834  * CHECK CONDITION status, this structure will be filled with the results of the
835  * subsequent request sense command. The pointer can also be NULL, in which case
836  * no sense information is returned.
837  */
838 static void msf_from_bcd(struct atapi_msf *msf)
839 {
840         msf->minute = bcd2bin(msf->minute);
841         msf->second = bcd2bin(msf->second);
842         msf->frame  = bcd2bin(msf->frame);
843 }
844
845 int cdrom_check_status(ide_drive_t *drive, struct request_sense *sense)
846 {
847         struct cdrom_info *info = drive->driver_data;
848         struct cdrom_device_info *cdi = &info->devinfo;
849         unsigned char cmd[BLK_MAX_CDB];
850
851         ide_debug_log(IDE_DBG_FUNC, "enter");
852
853         memset(cmd, 0, BLK_MAX_CDB);
854         cmd[0] = GPCMD_TEST_UNIT_READY;
855
856         /*
857          * Sanyo 3 CD changer uses byte 7 of TEST_UNIT_READY to switch CDs
858          * instead of supporting the LOAD_UNLOAD opcode.
859          */
860         cmd[7] = cdi->sanyo_slot % 3;
861
862         return ide_cd_queue_pc(drive, cmd, 0, NULL, NULL, sense, 0, REQ_QUIET);
863 }
864
865 static int cdrom_read_capacity(ide_drive_t *drive, unsigned long *capacity,
866                                unsigned long *sectors_per_frame,
867                                struct request_sense *sense)
868 {
869         struct {
870                 __be32 lba;
871                 __be32 blocklen;
872         } capbuf;
873
874         int stat;
875         unsigned char cmd[BLK_MAX_CDB];
876         unsigned len = sizeof(capbuf);
877         u32 blocklen;
878
879         ide_debug_log(IDE_DBG_FUNC, "enter");
880
881         memset(cmd, 0, BLK_MAX_CDB);
882         cmd[0] = GPCMD_READ_CDVD_CAPACITY;
883
884         stat = ide_cd_queue_pc(drive, cmd, 0, &capbuf, &len, sense, 0,
885                                REQ_QUIET);
886         if (stat)
887                 return stat;
888
889         /*
890          * Sanity check the given block size, in so far as making
891          * sure the sectors_per_frame we give to the caller won't
892          * end up being bogus.
893          */
894         blocklen = be32_to_cpu(capbuf.blocklen);
895         blocklen = (blocklen >> SECTOR_BITS) << SECTOR_BITS;
896         switch (blocklen) {
897         case 512:
898         case 1024:
899         case 2048:
900         case 4096:
901                 break;
902         default:
903                 printk_once(KERN_ERR PFX "%s: weird block size %u; "
904                                 "setting default block size to 2048\n",
905                                 drive->name, blocklen);
906                 blocklen = 2048;
907                 break;
908         }
909
910         *capacity = 1 + be32_to_cpu(capbuf.lba);
911         *sectors_per_frame = blocklen >> SECTOR_BITS;
912
913         ide_debug_log(IDE_DBG_PROBE, "cap: %lu, sectors_per_frame: %lu",
914                                      *capacity, *sectors_per_frame);
915
916         return 0;
917 }
918
919 static int cdrom_read_tocentry(ide_drive_t *drive, int trackno, int msf_flag,
920                                 int format, char *buf, int buflen,
921                                 struct request_sense *sense)
922 {
923         unsigned char cmd[BLK_MAX_CDB];
924
925         ide_debug_log(IDE_DBG_FUNC, "enter");
926
927         memset(cmd, 0, BLK_MAX_CDB);
928
929         cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
930         cmd[6] = trackno;
931         cmd[7] = (buflen >> 8);
932         cmd[8] = (buflen & 0xff);
933         cmd[9] = (format << 6);
934
935         if (msf_flag)
936                 cmd[1] = 2;
937
938         return ide_cd_queue_pc(drive, cmd, 0, buf, &buflen, sense, 0, REQ_QUIET);
939 }
940
941 /* Try to read the entire TOC for the disk into our internal buffer. */
942 int ide_cd_read_toc(ide_drive_t *drive, struct request_sense *sense)
943 {
944         int stat, ntracks, i;
945         struct cdrom_info *info = drive->driver_data;
946         struct cdrom_device_info *cdi = &info->devinfo;
947         struct atapi_toc *toc = info->toc;
948         struct {
949                 struct atapi_toc_header hdr;
950                 struct atapi_toc_entry  ent;
951         } ms_tmp;
952         long last_written;
953         unsigned long sectors_per_frame = SECTORS_PER_FRAME;
954
955         ide_debug_log(IDE_DBG_FUNC, "enter");
956
957         if (toc == NULL) {
958                 /* try to allocate space */
959                 toc = kmalloc(sizeof(struct atapi_toc), GFP_KERNEL);
960                 if (toc == NULL) {
961                         printk(KERN_ERR PFX "%s: No cdrom TOC buffer!\n",
962                                         drive->name);
963                         return -ENOMEM;
964                 }
965                 info->toc = toc;
966         }
967
968         /*
969          * Check to see if the existing data is still valid. If it is,
970          * just return.
971          */
972         (void) cdrom_check_status(drive, sense);
973
974         if (drive->atapi_flags & IDE_AFLAG_TOC_VALID)
975                 return 0;
976
977         /* try to get the total cdrom capacity and sector size */
978         stat = cdrom_read_capacity(drive, &toc->capacity, &sectors_per_frame,
979                                    sense);
980         if (stat)
981                 toc->capacity = 0x1fffff;
982
983         set_capacity(info->disk, toc->capacity * sectors_per_frame);
984         /* save a private copy of the TOC capacity for error handling */
985         drive->probed_capacity = toc->capacity * sectors_per_frame;
986
987         blk_queue_logical_block_size(drive->queue,
988                                      sectors_per_frame << SECTOR_BITS);
989
990         /* first read just the header, so we know how long the TOC is */
991         stat = cdrom_read_tocentry(drive, 0, 1, 0, (char *) &toc->hdr,
992                                     sizeof(struct atapi_toc_header), sense);
993         if (stat)
994                 return stat;
995
996         if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
997                 toc->hdr.first_track = bcd2bin(toc->hdr.first_track);
998                 toc->hdr.last_track  = bcd2bin(toc->hdr.last_track);
999         }
1000
1001         ntracks = toc->hdr.last_track - toc->hdr.first_track + 1;
1002         if (ntracks <= 0)
1003                 return -EIO;
1004         if (ntracks > MAX_TRACKS)
1005                 ntracks = MAX_TRACKS;
1006
1007         /* now read the whole schmeer */
1008         stat = cdrom_read_tocentry(drive, toc->hdr.first_track, 1, 0,
1009                                   (char *)&toc->hdr,
1010                                    sizeof(struct atapi_toc_header) +
1011                                    (ntracks + 1) *
1012                                    sizeof(struct atapi_toc_entry), sense);
1013
1014         if (stat && toc->hdr.first_track > 1) {
1015                 /*
1016                  * Cds with CDI tracks only don't have any TOC entries, despite
1017                  * of this the returned values are
1018                  * first_track == last_track = number of CDI tracks + 1,
1019                  * so that this case is indistinguishable from the same layout
1020                  * plus an additional audio track. If we get an error for the
1021                  * regular case, we assume a CDI without additional audio
1022                  * tracks. In this case the readable TOC is empty (CDI tracks
1023                  * are not included) and only holds the Leadout entry.
1024                  *
1025                  * Heiko EiƟfeldt.
1026                  */
1027                 ntracks = 0;
1028                 stat = cdrom_read_tocentry(drive, CDROM_LEADOUT, 1, 0,
1029                                            (char *)&toc->hdr,
1030                                            sizeof(struct atapi_toc_header) +
1031                                            (ntracks + 1) *
1032                                            sizeof(struct atapi_toc_entry),
1033                                            sense);
1034                 if (stat)
1035                         return stat;
1036
1037                 if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
1038                         toc->hdr.first_track = (u8)bin2bcd(CDROM_LEADOUT);
1039                         toc->hdr.last_track = (u8)bin2bcd(CDROM_LEADOUT);
1040                 } else {
1041                         toc->hdr.first_track = CDROM_LEADOUT;
1042                         toc->hdr.last_track = CDROM_LEADOUT;
1043                 }
1044         }
1045
1046         if (stat)
1047                 return stat;
1048
1049         toc->hdr.toc_length = be16_to_cpu(toc->hdr.toc_length);
1050
1051         if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
1052                 toc->hdr.first_track = bcd2bin(toc->hdr.first_track);
1053                 toc->hdr.last_track  = bcd2bin(toc->hdr.last_track);
1054         }
1055
1056         for (i = 0; i <= ntracks; i++) {
1057                 if (drive->atapi_flags & IDE_AFLAG_TOCADDR_AS_BCD) {
1058                         if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD)
1059                                 toc->ent[i].track = bcd2bin(toc->ent[i].track);
1060                         msf_from_bcd(&toc->ent[i].addr.msf);
1061                 }
1062                 toc->ent[i].addr.lba = msf_to_lba(toc->ent[i].addr.msf.minute,
1063                                                   toc->ent[i].addr.msf.second,
1064                                                   toc->ent[i].addr.msf.frame);
1065         }
1066
1067         if (toc->hdr.first_track != CDROM_LEADOUT) {
1068                 /* read the multisession information */
1069                 stat = cdrom_read_tocentry(drive, 0, 0, 1, (char *)&ms_tmp,
1070                                            sizeof(ms_tmp), sense);
1071                 if (stat)
1072                         return stat;
1073
1074                 toc->last_session_lba = be32_to_cpu(ms_tmp.ent.addr.lba);
1075         } else {
1076                 ms_tmp.hdr.last_track = CDROM_LEADOUT;
1077                 ms_tmp.hdr.first_track = ms_tmp.hdr.last_track;
1078                 toc->last_session_lba = msf_to_lba(0, 2, 0); /* 0m 2s 0f */
1079         }
1080
1081         if (drive->atapi_flags & IDE_AFLAG_TOCADDR_AS_BCD) {
1082                 /* re-read multisession information using MSF format */
1083                 stat = cdrom_read_tocentry(drive, 0, 1, 1, (char *)&ms_tmp,
1084                                            sizeof(ms_tmp), sense);
1085                 if (stat)
1086                         return stat;
1087
1088                 msf_from_bcd(&ms_tmp.ent.addr.msf);
1089                 toc->last_session_lba = msf_to_lba(ms_tmp.ent.addr.msf.minute,
1090                                                    ms_tmp.ent.addr.msf.second,
1091                                                    ms_tmp.ent.addr.msf.frame);
1092         }
1093
1094         toc->xa_flag = (ms_tmp.hdr.first_track != ms_tmp.hdr.last_track);
1095
1096         /* now try to get the total cdrom capacity */
1097         stat = cdrom_get_last_written(cdi, &last_written);
1098         if (!stat && (last_written > toc->capacity)) {
1099                 toc->capacity = last_written;
1100                 set_capacity(info->disk, toc->capacity * sectors_per_frame);
1101                 drive->probed_capacity = toc->capacity * sectors_per_frame;
1102         }
1103
1104         /* Remember that we've read this stuff. */
1105         drive->atapi_flags |= IDE_AFLAG_TOC_VALID;
1106
1107         return 0;
1108 }
1109
1110 int ide_cdrom_get_capabilities(ide_drive_t *drive, u8 *buf)
1111 {
1112         struct cdrom_info *info = drive->driver_data;
1113         struct cdrom_device_info *cdi = &info->devinfo;
1114         struct packet_command cgc;
1115         int stat, attempts = 3, size = ATAPI_CAPABILITIES_PAGE_SIZE;
1116
1117         ide_debug_log(IDE_DBG_FUNC, "enter");
1118
1119         if ((drive->atapi_flags & IDE_AFLAG_FULL_CAPS_PAGE) == 0)
1120                 size -= ATAPI_CAPABILITIES_PAGE_PAD_SIZE;
1121
1122         init_cdrom_command(&cgc, buf, size, CGC_DATA_UNKNOWN);
1123         do {
1124                 /* we seem to get stat=0x01,err=0x00 the first time (??) */
1125                 stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1126                 if (!stat)
1127                         break;
1128         } while (--attempts);
1129         return stat;
1130 }
1131
1132 void ide_cdrom_update_speed(ide_drive_t *drive, u8 *buf)
1133 {
1134         struct cdrom_info *cd = drive->driver_data;
1135         u16 curspeed, maxspeed;
1136
1137         ide_debug_log(IDE_DBG_FUNC, "enter");
1138
1139         if (drive->atapi_flags & IDE_AFLAG_LE_SPEED_FIELDS) {
1140                 curspeed = le16_to_cpup((__le16 *)&buf[8 + 14]);
1141                 maxspeed = le16_to_cpup((__le16 *)&buf[8 + 8]);
1142         } else {
1143                 curspeed = be16_to_cpup((__be16 *)&buf[8 + 14]);
1144                 maxspeed = be16_to_cpup((__be16 *)&buf[8 + 8]);
1145         }
1146
1147         ide_debug_log(IDE_DBG_PROBE, "curspeed: %u, maxspeed: %u",
1148                                      curspeed, maxspeed);
1149
1150         cd->current_speed = DIV_ROUND_CLOSEST(curspeed, 176);
1151         cd->max_speed = DIV_ROUND_CLOSEST(maxspeed, 176);
1152 }
1153
1154 #define IDE_CD_CAPABILITIES \
1155         (CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK | CDC_SELECT_SPEED | \
1156          CDC_SELECT_DISC | CDC_MULTI_SESSION | CDC_MCN | CDC_MEDIA_CHANGED | \
1157          CDC_PLAY_AUDIO | CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R | \
1158          CDC_CD_RW | CDC_DVD | CDC_DVD_R | CDC_DVD_RAM | CDC_GENERIC_PACKET | \
1159          CDC_MO_DRIVE | CDC_MRW | CDC_MRW_W | CDC_RAM)
1160
1161 static struct cdrom_device_ops ide_cdrom_dops = {
1162         .open                   = ide_cdrom_open_real,
1163         .release                = ide_cdrom_release_real,
1164         .drive_status           = ide_cdrom_drive_status,
1165         .media_changed          = ide_cdrom_check_media_change_real,
1166         .tray_move              = ide_cdrom_tray_move,
1167         .lock_door              = ide_cdrom_lock_door,
1168         .select_speed           = ide_cdrom_select_speed,
1169         .get_last_session       = ide_cdrom_get_last_session,
1170         .get_mcn                = ide_cdrom_get_mcn,
1171         .reset                  = ide_cdrom_reset,
1172         .audio_ioctl            = ide_cdrom_audio_ioctl,
1173         .capability             = IDE_CD_CAPABILITIES,
1174         .generic_packet         = ide_cdrom_packet,
1175 };
1176
1177 static int ide_cdrom_register(ide_drive_t *drive, int nslots)
1178 {
1179         struct cdrom_info *info = drive->driver_data;
1180         struct cdrom_device_info *devinfo = &info->devinfo;
1181
1182         ide_debug_log(IDE_DBG_PROBE, "nslots: %d", nslots);
1183
1184         devinfo->ops = &ide_cdrom_dops;
1185         devinfo->speed = info->current_speed;
1186         devinfo->capacity = nslots;
1187         devinfo->handle = drive;
1188         strcpy(devinfo->name, drive->name);
1189
1190         if (drive->atapi_flags & IDE_AFLAG_NO_SPEED_SELECT)
1191                 devinfo->mask |= CDC_SELECT_SPEED;
1192
1193         devinfo->disk = info->disk;
1194         return register_cdrom(devinfo);
1195 }
1196
1197 static int ide_cdrom_probe_capabilities(ide_drive_t *drive)
1198 {
1199         struct cdrom_info *cd = drive->driver_data;
1200         struct cdrom_device_info *cdi = &cd->devinfo;
1201         u8 buf[ATAPI_CAPABILITIES_PAGE_SIZE];
1202         mechtype_t mechtype;
1203         int nslots = 1;
1204
1205         ide_debug_log(IDE_DBG_PROBE, "media: 0x%x, atapi_flags: 0x%lx",
1206                                      drive->media, drive->atapi_flags);
1207
1208         cdi->mask = (CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R |
1209                      CDC_DVD_RAM | CDC_SELECT_DISC | CDC_PLAY_AUDIO |
1210                      CDC_MO_DRIVE | CDC_RAM);
1211
1212         if (drive->media == ide_optical) {
1213                 cdi->mask &= ~(CDC_MO_DRIVE | CDC_RAM);
1214                 printk(KERN_ERR PFX "%s: ATAPI magneto-optical drive\n",
1215                                 drive->name);
1216                 return nslots;
1217         }
1218
1219         if (drive->atapi_flags & IDE_AFLAG_PRE_ATAPI12) {
1220                 drive->atapi_flags &= ~IDE_AFLAG_NO_EJECT;
1221                 cdi->mask &= ~CDC_PLAY_AUDIO;
1222                 return nslots;
1223         }
1224
1225         /*
1226          * We have to cheat a little here. the packet will eventually be queued
1227          * with ide_cdrom_packet(), which extracts the drive from cdi->handle.
1228          * Since this device hasn't been registered with the Uniform layer yet,
1229          * it can't do this. Same goes for cdi->ops.
1230          */
1231         cdi->handle = drive;
1232         cdi->ops = &ide_cdrom_dops;
1233
1234         if (ide_cdrom_get_capabilities(drive, buf))
1235                 return 0;
1236
1237         if ((buf[8 + 6] & 0x01) == 0)
1238                 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
1239         if (buf[8 + 6] & 0x08)
1240                 drive->atapi_flags &= ~IDE_AFLAG_NO_EJECT;
1241         if (buf[8 + 3] & 0x01)
1242                 cdi->mask &= ~CDC_CD_R;
1243         if (buf[8 + 3] & 0x02)
1244                 cdi->mask &= ~(CDC_CD_RW | CDC_RAM);
1245         if (buf[8 + 2] & 0x38)
1246                 cdi->mask &= ~CDC_DVD;
1247         if (buf[8 + 3] & 0x20)
1248                 cdi->mask &= ~(CDC_DVD_RAM | CDC_RAM);
1249         if (buf[8 + 3] & 0x10)
1250                 cdi->mask &= ~CDC_DVD_R;
1251         if ((buf[8 + 4] & 0x01) || (drive->atapi_flags & IDE_AFLAG_PLAY_AUDIO_OK))
1252                 cdi->mask &= ~CDC_PLAY_AUDIO;
1253
1254         mechtype = buf[8 + 6] >> 5;
1255         if (mechtype == mechtype_caddy ||
1256             mechtype == mechtype_popup ||
1257             (drive->atapi_flags & IDE_AFLAG_NO_AUTOCLOSE))
1258                 cdi->mask |= CDC_CLOSE_TRAY;
1259
1260         if (cdi->sanyo_slot > 0) {
1261                 cdi->mask &= ~CDC_SELECT_DISC;
1262                 nslots = 3;
1263         } else if (mechtype == mechtype_individual_changer ||
1264                    mechtype == mechtype_cartridge_changer) {
1265                 nslots = cdrom_number_of_slots(cdi);
1266                 if (nslots > 1)
1267                         cdi->mask &= ~CDC_SELECT_DISC;
1268         }
1269
1270         ide_cdrom_update_speed(drive, buf);
1271
1272         printk(KERN_INFO PFX "%s: ATAPI", drive->name);
1273
1274         /* don't print speed if the drive reported 0 */
1275         if (cd->max_speed)
1276                 printk(KERN_CONT " %dX", cd->max_speed);
1277
1278         printk(KERN_CONT " %s", (cdi->mask & CDC_DVD) ? "CD-ROM" : "DVD-ROM");
1279
1280         if ((cdi->mask & CDC_DVD_R) == 0 || (cdi->mask & CDC_DVD_RAM) == 0)
1281                 printk(KERN_CONT " DVD%s%s",
1282                                  (cdi->mask & CDC_DVD_R) ? "" : "-R",
1283                                  (cdi->mask & CDC_DVD_RAM) ? "" : "/RAM");
1284
1285         if ((cdi->mask & CDC_CD_R) == 0 || (cdi->mask & CDC_CD_RW) == 0)
1286                 printk(KERN_CONT " CD%s%s",
1287                                  (cdi->mask & CDC_CD_R) ? "" : "-R",
1288                                  (cdi->mask & CDC_CD_RW) ? "" : "/RW");
1289
1290         if ((cdi->mask & CDC_SELECT_DISC) == 0)
1291                 printk(KERN_CONT " changer w/%d slots", nslots);
1292         else
1293                 printk(KERN_CONT " drive");
1294
1295         printk(KERN_CONT ", %dkB Cache\n",
1296                          be16_to_cpup((__be16 *)&buf[8 + 12]));
1297
1298         return nslots;
1299 }
1300
1301 /* standard prep_rq_fn that builds 10 byte cmds */
1302 static int ide_cdrom_prep_fs(struct request_queue *q, struct request *rq)
1303 {
1304         int hard_sect = queue_logical_block_size(q);
1305         long block = (long)blk_rq_pos(rq) / (hard_sect >> 9);
1306         unsigned long blocks = blk_rq_sectors(rq) / (hard_sect >> 9);
1307
1308         memset(rq->cmd, 0, BLK_MAX_CDB);
1309
1310         if (rq_data_dir(rq) == READ)
1311                 rq->cmd[0] = GPCMD_READ_10;
1312         else
1313                 rq->cmd[0] = GPCMD_WRITE_10;
1314
1315         /*
1316          * fill in lba
1317          */
1318         rq->cmd[2] = (block >> 24) & 0xff;
1319         rq->cmd[3] = (block >> 16) & 0xff;
1320         rq->cmd[4] = (block >>  8) & 0xff;
1321         rq->cmd[5] = block & 0xff;
1322
1323         /*
1324          * and transfer length
1325          */
1326         rq->cmd[7] = (blocks >> 8) & 0xff;
1327         rq->cmd[8] = blocks & 0xff;
1328         rq->cmd_len = 10;
1329         return BLKPREP_OK;
1330 }
1331
1332 /*
1333  * Most of the SCSI commands are supported directly by ATAPI devices.
1334  * This transform handles the few exceptions.
1335  */
1336 static int ide_cdrom_prep_pc(struct request *rq)
1337 {
1338         u8 *c = rq->cmd;
1339
1340         /* transform 6-byte read/write commands to the 10-byte version */
1341         if (c[0] == READ_6 || c[0] == WRITE_6) {
1342                 c[8] = c[4];
1343                 c[5] = c[3];
1344                 c[4] = c[2];
1345                 c[3] = c[1] & 0x1f;
1346                 c[2] = 0;
1347                 c[1] &= 0xe0;
1348                 c[0] += (READ_10 - READ_6);
1349                 rq->cmd_len = 10;
1350                 return BLKPREP_OK;
1351         }
1352
1353         /*
1354          * it's silly to pretend we understand 6-byte sense commands, just
1355          * reject with ILLEGAL_REQUEST and the caller should take the
1356          * appropriate action
1357          */
1358         if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
1359                 rq->errors = ILLEGAL_REQUEST;
1360                 return BLKPREP_KILL;
1361         }
1362
1363         return BLKPREP_OK;
1364 }
1365
1366 static int ide_cdrom_prep_fn(struct request_queue *q, struct request *rq)
1367 {
1368         if (blk_fs_request(rq))
1369                 return ide_cdrom_prep_fs(q, rq);
1370         else if (blk_pc_request(rq))
1371                 return ide_cdrom_prep_pc(rq);
1372
1373         return 0;
1374 }
1375
1376 struct cd_list_entry {
1377         const char      *id_model;
1378         const char      *id_firmware;
1379         unsigned int    cd_flags;
1380 };
1381
1382 #ifdef CONFIG_IDE_PROC_FS
1383 static sector_t ide_cdrom_capacity(ide_drive_t *drive)
1384 {
1385         unsigned long capacity, sectors_per_frame;
1386
1387         if (cdrom_read_capacity(drive, &capacity, &sectors_per_frame, NULL))
1388                 return 0;
1389
1390         return capacity * sectors_per_frame;
1391 }
1392
1393 static int idecd_capacity_proc_show(struct seq_file *m, void *v)
1394 {
1395         ide_drive_t *drive = m->private;
1396
1397         seq_printf(m, "%llu\n", (long long)ide_cdrom_capacity(drive));
1398         return 0;
1399 }
1400
1401 static int idecd_capacity_proc_open(struct inode *inode, struct file *file)
1402 {
1403         return single_open(file, idecd_capacity_proc_show, PDE(inode)->data);
1404 }
1405
1406 static const struct file_operations idecd_capacity_proc_fops = {
1407         .owner          = THIS_MODULE,
1408         .open           = idecd_capacity_proc_open,
1409         .read           = seq_read,
1410         .llseek         = seq_lseek,
1411         .release        = single_release,
1412 };
1413
1414 static ide_proc_entry_t idecd_proc[] = {
1415         { "capacity", S_IFREG|S_IRUGO, &idecd_capacity_proc_fops },
1416         {}
1417 };
1418
1419 static ide_proc_entry_t *ide_cd_proc_entries(ide_drive_t *drive)
1420 {
1421         return idecd_proc;
1422 }
1423
1424 static const struct ide_proc_devset *ide_cd_proc_devsets(ide_drive_t *drive)
1425 {
1426         return NULL;
1427 }
1428 #endif
1429
1430 static const struct cd_list_entry ide_cd_quirks_list[] = {
1431         /* SCR-3231 doesn't support the SET_CD_SPEED command. */
1432         { "SAMSUNG CD-ROM SCR-3231", NULL,   IDE_AFLAG_NO_SPEED_SELECT       },
1433         /* Old NEC260 (not R) was released before ATAPI 1.2 spec. */
1434         { "NEC CD-ROM DRIVE:260",    "1.01", IDE_AFLAG_TOCADDR_AS_BCD |
1435                                              IDE_AFLAG_PRE_ATAPI12,          },
1436         /* Vertos 300, some versions of this drive like to talk BCD. */
1437         { "V003S0DS",                NULL,   IDE_AFLAG_VERTOS_300_SSD,       },
1438         /* Vertos 600 ESD. */
1439         { "V006E0DS",                NULL,   IDE_AFLAG_VERTOS_600_ESD,       },
1440         /*
1441          * Sanyo 3 CD changer uses a non-standard command for CD changing
1442          * (by default standard ATAPI support for CD changers is used).
1443          */
1444         { "CD-ROM CDR-C3 G",         NULL,   IDE_AFLAG_SANYO_3CD             },
1445         { "CD-ROM CDR-C3G",          NULL,   IDE_AFLAG_SANYO_3CD             },
1446         { "CD-ROM CDR_C36",          NULL,   IDE_AFLAG_SANYO_3CD             },
1447         /* Stingray 8X CD-ROM. */
1448         { "STINGRAY 8422 IDE 8X CD-ROM 7-27-95", NULL, IDE_AFLAG_PRE_ATAPI12 },
1449         /*
1450          * ACER 50X CD-ROM and WPI 32X CD-ROM require the full spec length
1451          * mode sense page capabilities size, but older drives break.
1452          */
1453         { "ATAPI CD ROM DRIVE 50X MAX", NULL,   IDE_AFLAG_FULL_CAPS_PAGE     },
1454         { "WPI CDS-32X",                NULL,   IDE_AFLAG_FULL_CAPS_PAGE     },
1455         /* ACER/AOpen 24X CD-ROM has the speed fields byte-swapped. */
1456         { "",                        "241N", IDE_AFLAG_LE_SPEED_FIELDS       },
1457         /*
1458          * Some drives used by Apple don't advertise audio play
1459          * but they do support reading TOC & audio datas.
1460          */
1461         { "MATSHITADVD-ROM SR-8187", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1462         { "MATSHITADVD-ROM SR-8186", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1463         { "MATSHITADVD-ROM SR-8176", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1464         { "MATSHITADVD-ROM SR-8174", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1465         { "Optiarc DVD RW AD-5200A", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1466         { "Optiarc DVD RW AD-7200A", NULL,   IDE_AFLAG_PLAY_AUDIO_OK         },
1467         { "Optiarc DVD RW AD-7543A", NULL,   IDE_AFLAG_NO_AUTOCLOSE          },
1468         { "TEAC CD-ROM CD-224E",     NULL,   IDE_AFLAG_NO_AUTOCLOSE          },
1469         { NULL, NULL, 0 }
1470 };
1471
1472 static unsigned int ide_cd_flags(u16 *id)
1473 {
1474         const struct cd_list_entry *cle = ide_cd_quirks_list;
1475
1476         while (cle->id_model) {
1477                 if (strcmp(cle->id_model, (char *)&id[ATA_ID_PROD]) == 0 &&
1478                     (cle->id_firmware == NULL ||
1479                      strstr((char *)&id[ATA_ID_FW_REV], cle->id_firmware)))
1480                         return cle->cd_flags;
1481                 cle++;
1482         }
1483
1484         return 0;
1485 }
1486
1487 static int ide_cdrom_setup(ide_drive_t *drive)
1488 {
1489         struct cdrom_info *cd = drive->driver_data;
1490         struct cdrom_device_info *cdi = &cd->devinfo;
1491         struct request_queue *q = drive->queue;
1492         u16 *id = drive->id;
1493         char *fw_rev = (char *)&id[ATA_ID_FW_REV];
1494         int nslots;
1495
1496         ide_debug_log(IDE_DBG_PROBE, "enter");
1497
1498         blk_queue_prep_rq(q, ide_cdrom_prep_fn);
1499         blk_queue_dma_alignment(q, 31);
1500         blk_queue_update_dma_pad(q, 15);
1501
1502         q->unplug_delay = max((1 * HZ) / 1000, 1);
1503
1504         drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;
1505         drive->atapi_flags = IDE_AFLAG_NO_EJECT | ide_cd_flags(id);
1506
1507         if ((drive->atapi_flags & IDE_AFLAG_VERTOS_300_SSD) &&
1508             fw_rev[4] == '1' && fw_rev[6] <= '2')
1509                 drive->atapi_flags |= (IDE_AFLAG_TOCTRACKS_AS_BCD |
1510                                      IDE_AFLAG_TOCADDR_AS_BCD);
1511         else if ((drive->atapi_flags & IDE_AFLAG_VERTOS_600_ESD) &&
1512                  fw_rev[4] == '1' && fw_rev[6] <= '2')
1513                 drive->atapi_flags |= IDE_AFLAG_TOCTRACKS_AS_BCD;
1514         else if (drive->atapi_flags & IDE_AFLAG_SANYO_3CD)
1515                 /* 3 => use CD in slot 0 */
1516                 cdi->sanyo_slot = 3;
1517
1518         nslots = ide_cdrom_probe_capabilities(drive);
1519
1520         blk_queue_logical_block_size(q, CD_FRAMESIZE);
1521
1522         if (ide_cdrom_register(drive, nslots)) {
1523                 printk(KERN_ERR PFX "%s: %s failed to register device with the"
1524                                 " cdrom driver.\n", drive->name, __func__);
1525                 cd->devinfo.handle = NULL;
1526                 return 1;
1527         }
1528
1529         ide_proc_register_driver(drive, cd->driver);
1530         return 0;
1531 }
1532
1533 static void ide_cd_remove(ide_drive_t *drive)
1534 {
1535         struct cdrom_info *info = drive->driver_data;
1536
1537         ide_debug_log(IDE_DBG_FUNC, "enter");
1538
1539         ide_proc_unregister_driver(drive, info->driver);
1540         device_del(&info->dev);
1541         del_gendisk(info->disk);
1542
1543         mutex_lock(&idecd_ref_mutex);
1544         put_device(&info->dev);
1545         mutex_unlock(&idecd_ref_mutex);
1546 }
1547
1548 static void ide_cd_release(struct device *dev)
1549 {
1550         struct cdrom_info *info = to_ide_drv(dev, cdrom_info);
1551         struct cdrom_device_info *devinfo = &info->devinfo;
1552         ide_drive_t *drive = info->drive;
1553         struct gendisk *g = info->disk;
1554
1555         ide_debug_log(IDE_DBG_FUNC, "enter");
1556
1557         kfree(info->toc);
1558         if (devinfo->handle == drive)
1559                 unregister_cdrom(devinfo);
1560         drive->driver_data = NULL;
1561         blk_queue_prep_rq(drive->queue, NULL);
1562         g->private_data = NULL;
1563         put_disk(g);
1564         kfree(info);
1565 }
1566
1567 static int ide_cd_probe(ide_drive_t *);
1568
1569 static struct ide_driver ide_cdrom_driver = {
1570         .gen_driver = {
1571                 .owner          = THIS_MODULE,
1572                 .name           = "ide-cdrom",
1573                 .bus            = &ide_bus_type,
1574         },
1575         .probe                  = ide_cd_probe,
1576         .remove                 = ide_cd_remove,
1577         .version                = IDECD_VERSION,
1578         .do_request             = ide_cd_do_request,
1579 #ifdef CONFIG_IDE_PROC_FS
1580         .proc_entries           = ide_cd_proc_entries,
1581         .proc_devsets           = ide_cd_proc_devsets,
1582 #endif
1583 };
1584
1585 static int idecd_open(struct block_device *bdev, fmode_t mode)
1586 {
1587         struct cdrom_info *info = ide_cd_get(bdev->bd_disk);
1588         int rc = -ENOMEM;
1589
1590         if (!info)
1591                 return -ENXIO;
1592
1593         rc = cdrom_open(&info->devinfo, bdev, mode);
1594
1595         if (rc < 0)
1596                 ide_cd_put(info);
1597
1598         return rc;
1599 }
1600
1601 static int idecd_release(struct gendisk *disk, fmode_t mode)
1602 {
1603         struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
1604
1605         cdrom_release(&info->devinfo, mode);
1606
1607         ide_cd_put(info);
1608
1609         return 0;
1610 }
1611
1612 static int idecd_set_spindown(struct cdrom_device_info *cdi, unsigned long arg)
1613 {
1614         struct packet_command cgc;
1615         char buffer[16];
1616         int stat;
1617         char spindown;
1618
1619         if (copy_from_user(&spindown, (void __user *)arg, sizeof(char)))
1620                 return -EFAULT;
1621
1622         init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_UNKNOWN);
1623
1624         stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CDROM_PAGE, 0);
1625         if (stat)
1626                 return stat;
1627
1628         buffer[11] = (buffer[11] & 0xf0) | (spindown & 0x0f);
1629         return cdrom_mode_select(cdi, &cgc);
1630 }
1631
1632 static int idecd_get_spindown(struct cdrom_device_info *cdi, unsigned long arg)
1633 {
1634         struct packet_command cgc;
1635         char buffer[16];
1636         int stat;
1637         char spindown;
1638
1639         init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_UNKNOWN);
1640
1641         stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CDROM_PAGE, 0);
1642         if (stat)
1643                 return stat;
1644
1645         spindown = buffer[11] & 0x0f;
1646         if (copy_to_user((void __user *)arg, &spindown, sizeof(char)))
1647                 return -EFAULT;
1648         return 0;
1649 }
1650
1651 static int idecd_ioctl(struct block_device *bdev, fmode_t mode,
1652                         unsigned int cmd, unsigned long arg)
1653 {
1654         struct cdrom_info *info = ide_drv_g(bdev->bd_disk, cdrom_info);
1655         int err;
1656
1657         switch (cmd) {
1658         case CDROMSETSPINDOWN:
1659                 return idecd_set_spindown(&info->devinfo, arg);
1660         case CDROMGETSPINDOWN:
1661                 return idecd_get_spindown(&info->devinfo, arg);
1662         default:
1663                 break;
1664         }
1665
1666         err = generic_ide_ioctl(info->drive, bdev, cmd, arg);
1667         if (err == -EINVAL)
1668                 err = cdrom_ioctl(&info->devinfo, bdev, mode, cmd, arg);
1669
1670         return err;
1671 }
1672
1673 static int idecd_media_changed(struct gendisk *disk)
1674 {
1675         struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
1676         return cdrom_media_changed(&info->devinfo);
1677 }
1678
1679 static int idecd_revalidate_disk(struct gendisk *disk)
1680 {
1681         struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
1682         struct request_sense sense;
1683
1684         ide_cd_read_toc(info->drive, &sense);
1685
1686         return  0;
1687 }
1688
1689 static const struct block_device_operations idecd_ops = {
1690         .owner                  = THIS_MODULE,
1691         .open                   = idecd_open,
1692         .release                = idecd_release,
1693         .locked_ioctl           = idecd_ioctl,
1694         .media_changed          = idecd_media_changed,
1695         .revalidate_disk        = idecd_revalidate_disk
1696 };
1697
1698 /* module options */
1699 static unsigned long debug_mask;
1700 module_param(debug_mask, ulong, 0644);
1701
1702 MODULE_DESCRIPTION("ATAPI CD-ROM Driver");
1703
1704 static int ide_cd_probe(ide_drive_t *drive)
1705 {
1706         struct cdrom_info *info;
1707         struct gendisk *g;
1708         struct request_sense sense;
1709
1710         ide_debug_log(IDE_DBG_PROBE, "driver_req: %s, media: 0x%x",
1711                                      drive->driver_req, drive->media);
1712
1713         if (!strstr("ide-cdrom", drive->driver_req))
1714                 goto failed;
1715
1716         if (drive->media != ide_cdrom && drive->media != ide_optical)
1717                 goto failed;
1718
1719         drive->debug_mask = debug_mask;
1720         drive->irq_handler = cdrom_newpc_intr;
1721
1722         info = kzalloc(sizeof(struct cdrom_info), GFP_KERNEL);
1723         if (info == NULL) {
1724                 printk(KERN_ERR PFX "%s: Can't allocate a cdrom structure\n",
1725                                 drive->name);
1726                 goto failed;
1727         }
1728
1729         g = alloc_disk(1 << PARTN_BITS);
1730         if (!g)
1731                 goto out_free_cd;
1732
1733         ide_init_disk(g, drive);
1734
1735         info->dev.parent = &drive->gendev;
1736         info->dev.release = ide_cd_release;
1737         dev_set_name(&info->dev, dev_name(&drive->gendev));
1738
1739         if (device_register(&info->dev))
1740                 goto out_free_disk;
1741
1742         info->drive = drive;
1743         info->driver = &ide_cdrom_driver;
1744         info->disk = g;
1745
1746         g->private_data = &info->driver;
1747
1748         drive->driver_data = info;
1749
1750         g->minors = 1;
1751         g->driverfs_dev = &drive->gendev;
1752         g->flags = GENHD_FL_CD | GENHD_FL_REMOVABLE;
1753         if (ide_cdrom_setup(drive)) {
1754                 put_device(&info->dev);
1755                 goto failed;
1756         }
1757
1758         ide_cd_read_toc(drive, &sense);
1759         g->fops = &idecd_ops;
1760         g->flags |= GENHD_FL_REMOVABLE;
1761         add_disk(g);
1762         return 0;
1763
1764 out_free_disk:
1765         put_disk(g);
1766 out_free_cd:
1767         kfree(info);
1768 failed:
1769         return -ENODEV;
1770 }
1771
1772 static void __exit ide_cdrom_exit(void)
1773 {
1774         driver_unregister(&ide_cdrom_driver.gen_driver);
1775 }
1776
1777 static int __init ide_cdrom_init(void)
1778 {
1779         printk(KERN_INFO DRV_NAME " driver " IDECD_VERSION "\n");
1780         return driver_register(&ide_cdrom_driver.gen_driver);
1781 }
1782
1783 MODULE_ALIAS("ide:*m-cdrom*");
1784 MODULE_ALIAS("ide-cd");
1785 module_init(ide_cdrom_init);
1786 module_exit(ide_cdrom_exit);
1787 MODULE_LICENSE("GPL");