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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * ATAPI support.
4 */
5
6#include <linux/kernel.h>
7#include <linux/cdrom.h>
8#include <linux/delay.h>
9#include <linux/export.h>
10#include <linux/ide.h>
11#include <linux/scatterlist.h>
12#include <linux/gfp.h>
13
14#include <scsi/scsi.h>
15
16#define DRV_NAME "ide-atapi"
17#define PFX DRV_NAME ": "
18
19#ifdef DEBUG
20#define debug_log(fmt, args...) \
21 printk(KERN_INFO "ide: " fmt, ## args)
22#else
23#define debug_log(fmt, args...) do {} while (0)
24#endif
25
26#define ATAPI_MIN_CDB_BYTES 12
27
28static inline int dev_is_idecd(ide_drive_t *drive)
29{
30 return drive->media == ide_cdrom || drive->media == ide_optical;
31}
32
33/*
34 * Check whether we can support a device,
35 * based on the ATAPI IDENTIFY command results.
36 */
37int ide_check_atapi_device(ide_drive_t *drive, const char *s)
38{
39 u16 *id = drive->id;
40 u8 gcw[2], protocol, device_type, removable, drq_type, packet_size;
41
42 *((u16 *)&gcw) = id[ATA_ID_CONFIG];
43
44 protocol = (gcw[1] & 0xC0) >> 6;
45 device_type = gcw[1] & 0x1F;
46 removable = (gcw[0] & 0x80) >> 7;
47 drq_type = (gcw[0] & 0x60) >> 5;
48 packet_size = gcw[0] & 0x03;
49
50#ifdef CONFIG_PPC
51 /* kludge for Apple PowerBook internal zip */
52 if (drive->media == ide_floppy && device_type == 5 &&
53 !strstr((char *)&id[ATA_ID_PROD], "CD-ROM") &&
54 strstr((char *)&id[ATA_ID_PROD], "ZIP"))
55 device_type = 0;
56#endif
57
58 if (protocol != 2)
59 printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n",
60 s, drive->name, protocol);
61 else if ((drive->media == ide_floppy && device_type != 0) ||
62 (drive->media == ide_tape && device_type != 1))
63 printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n",
64 s, drive->name, device_type);
65 else if (removable == 0)
66 printk(KERN_ERR "%s: %s: the removable flag is not set\n",
67 s, drive->name);
68 else if (drive->media == ide_floppy && drq_type == 3)
69 printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not "
70 "supported\n", s, drive->name, drq_type);
71 else if (packet_size != 0)
72 printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 "
73 "bytes\n", s, drive->name, packet_size);
74 else
75 return 1;
76 return 0;
77}
78EXPORT_SYMBOL_GPL(ide_check_atapi_device);
79
80void ide_init_pc(struct ide_atapi_pc *pc)
81{
82 memset(pc, 0, sizeof(*pc));
83}
84EXPORT_SYMBOL_GPL(ide_init_pc);
85
86/*
87 * Add a special packet command request to the tail of the request queue,
88 * and wait for it to be serviced.
89 */
90int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk,
91 struct ide_atapi_pc *pc, void *buf, unsigned int bufflen)
92{
93 struct request *rq;
94 int error;
95
96 rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, 0);
97 ide_req(rq)->type = ATA_PRIV_MISC;
98 ide_req(rq)->special = pc;
99
100 if (buf && bufflen) {
101 error = blk_rq_map_kern(drive->queue, rq, buf, bufflen,
102 GFP_NOIO);
103 if (error)
104 goto put_req;
105 }
106
107 memcpy(scsi_req(rq)->cmd, pc->c, 12);
108 if (drive->media == ide_tape)
109 scsi_req(rq)->cmd[13] = REQ_IDETAPE_PC1;
110 blk_execute_rq(drive->queue, disk, rq, 0);
111 error = scsi_req(rq)->result ? -EIO : 0;
112put_req:
113 blk_put_request(rq);
114 return error;
115}
116EXPORT_SYMBOL_GPL(ide_queue_pc_tail);
117
118int ide_do_test_unit_ready(ide_drive_t *drive, struct gendisk *disk)
119{
120 struct ide_atapi_pc pc;
121
122 ide_init_pc(&pc);
123 pc.c[0] = TEST_UNIT_READY;
124
125 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
126}
127EXPORT_SYMBOL_GPL(ide_do_test_unit_ready);
128
129int ide_do_start_stop(ide_drive_t *drive, struct gendisk *disk, int start)
130{
131 struct ide_atapi_pc pc;
132
133 ide_init_pc(&pc);
134 pc.c[0] = START_STOP;
135 pc.c[4] = start;
136
137 if (drive->media == ide_tape)
138 pc.flags |= PC_FLAG_WAIT_FOR_DSC;
139
140 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
141}
142EXPORT_SYMBOL_GPL(ide_do_start_stop);
143
144int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on)
145{
146 struct ide_atapi_pc pc;
147
148 if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0)
149 return 0;
150
151 ide_init_pc(&pc);
152 pc.c[0] = ALLOW_MEDIUM_REMOVAL;
153 pc.c[4] = on;
154
155 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
156}
157EXPORT_SYMBOL_GPL(ide_set_media_lock);
158
159void ide_create_request_sense_cmd(ide_drive_t *drive, struct ide_atapi_pc *pc)
160{
161 ide_init_pc(pc);
162 pc->c[0] = REQUEST_SENSE;
163 if (drive->media == ide_floppy) {
164 pc->c[4] = 255;
165 pc->req_xfer = 18;
166 } else {
167 pc->c[4] = 20;
168 pc->req_xfer = 20;
169 }
170}
171EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd);
172
173void ide_prep_sense(ide_drive_t *drive, struct request *rq)
174{
175 struct request_sense *sense = &drive->sense_data;
176 struct request *sense_rq;
177 struct scsi_request *req;
178 unsigned int cmd_len, sense_len;
179 int err;
180
181 switch (drive->media) {
182 case ide_floppy:
183 cmd_len = 255;
184 sense_len = 18;
185 break;
186 case ide_tape:
187 cmd_len = 20;
188 sense_len = 20;
189 break;
190 default:
191 cmd_len = 18;
192 sense_len = 18;
193 }
194
195 BUG_ON(sense_len > sizeof(*sense));
196
197 if (ata_sense_request(rq) || drive->sense_rq_armed)
198 return;
199
200 sense_rq = drive->sense_rq;
201 if (!sense_rq) {
202 sense_rq = blk_mq_alloc_request(drive->queue, REQ_OP_DRV_IN,
203 BLK_MQ_REQ_RESERVED | BLK_MQ_REQ_NOWAIT);
204 drive->sense_rq = sense_rq;
205 }
206 req = scsi_req(sense_rq);
207
208 memset(sense, 0, sizeof(*sense));
209
210 scsi_req_init(req);
211
212 err = blk_rq_map_kern(drive->queue, sense_rq, sense, sense_len,
213 GFP_NOIO);
214 if (unlikely(err)) {
215 if (printk_ratelimit())
216 printk(KERN_WARNING PFX "%s: failed to map sense "
217 "buffer\n", drive->name);
218 blk_mq_free_request(sense_rq);
219 drive->sense_rq = NULL;
220 return;
221 }
222
223 sense_rq->rq_disk = rq->rq_disk;
224 sense_rq->cmd_flags = REQ_OP_DRV_IN;
225 ide_req(sense_rq)->type = ATA_PRIV_SENSE;
226 sense_rq->rq_flags |= RQF_PREEMPT;
227
228 req->cmd[0] = GPCMD_REQUEST_SENSE;
229 req->cmd[4] = cmd_len;
230 if (drive->media == ide_tape)
231 req->cmd[13] = REQ_IDETAPE_PC1;
232
233 drive->sense_rq_armed = true;
234}
235EXPORT_SYMBOL_GPL(ide_prep_sense);
236
237int ide_queue_sense_rq(ide_drive_t *drive, void *special)
238{
239 ide_hwif_t *hwif = drive->hwif;
240 struct request *sense_rq;
241 unsigned long flags;
242
243 spin_lock_irqsave(&hwif->lock, flags);
244
245 /* deferred failure from ide_prep_sense() */
246 if (!drive->sense_rq_armed) {
247 printk(KERN_WARNING PFX "%s: error queuing a sense request\n",
248 drive->name);
249 spin_unlock_irqrestore(&hwif->lock, flags);
250 return -ENOMEM;
251 }
252
253 sense_rq = drive->sense_rq;
254 ide_req(sense_rq)->special = special;
255 drive->sense_rq_armed = false;
256
257 drive->hwif->rq = NULL;
258
259 ide_insert_request_head(drive, sense_rq);
260 spin_unlock_irqrestore(&hwif->lock, flags);
261 return 0;
262}
263EXPORT_SYMBOL_GPL(ide_queue_sense_rq);
264
265/*
266 * Called when an error was detected during the last packet command.
267 * We queue a request sense packet command at the head of the request
268 * queue.
269 */
270void ide_retry_pc(ide_drive_t *drive)
271{
272 struct request *failed_rq = drive->hwif->rq;
273 struct request *sense_rq = drive->sense_rq;
274 struct ide_atapi_pc *pc = &drive->request_sense_pc;
275
276 (void)ide_read_error(drive);
277
278 /* init pc from sense_rq */
279 ide_init_pc(pc);
280 memcpy(pc->c, scsi_req(sense_rq)->cmd, 12);
281
282 if (drive->media == ide_tape)
283 drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC;
284
285 /*
286 * Push back the failed request and put request sense on top
287 * of it. The failed command will be retried after sense data
288 * is acquired.
289 */
290 drive->hwif->rq = NULL;
291 ide_requeue_and_plug(drive, failed_rq);
292 if (ide_queue_sense_rq(drive, pc))
293 ide_complete_rq(drive, BLK_STS_IOERR, blk_rq_bytes(failed_rq));
294}
295EXPORT_SYMBOL_GPL(ide_retry_pc);
296
297int ide_cd_expiry(ide_drive_t *drive)
298{
299 struct request *rq = drive->hwif->rq;
300 unsigned long wait = 0;
301
302 debug_log("%s: scsi_req(rq)->cmd[0]: 0x%x\n", __func__, scsi_req(rq)->cmd[0]);
303
304 /*
305 * Some commands are *slow* and normally take a long time to complete.
306 * Usually we can use the ATAPI "disconnect" to bypass this, but not all
307 * commands/drives support that. Let ide_timer_expiry keep polling us
308 * for these.
309 */
310 switch (scsi_req(rq)->cmd[0]) {
311 case GPCMD_BLANK:
312 case GPCMD_FORMAT_UNIT:
313 case GPCMD_RESERVE_RZONE_TRACK:
314 case GPCMD_CLOSE_TRACK:
315 case GPCMD_FLUSH_CACHE:
316 wait = ATAPI_WAIT_PC;
317 break;
318 default:
319 if (!(rq->rq_flags & RQF_QUIET))
320 printk(KERN_INFO PFX "cmd 0x%x timed out\n",
321 scsi_req(rq)->cmd[0]);
322 wait = 0;
323 break;
324 }
325 return wait;
326}
327EXPORT_SYMBOL_GPL(ide_cd_expiry);
328
329int ide_cd_get_xferlen(struct request *rq)
330{
331 switch (req_op(rq)) {
332 default:
333 return 32768;
334 case REQ_OP_SCSI_IN:
335 case REQ_OP_SCSI_OUT:
336 return blk_rq_bytes(rq);
337 case REQ_OP_DRV_IN:
338 case REQ_OP_DRV_OUT:
339 switch (ide_req(rq)->type) {
340 case ATA_PRIV_PC:
341 case ATA_PRIV_SENSE:
342 return blk_rq_bytes(rq);
343 default:
344 return 0;
345 }
346 }
347}
348EXPORT_SYMBOL_GPL(ide_cd_get_xferlen);
349
350void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason)
351{
352 struct ide_taskfile tf;
353
354 drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT |
355 IDE_VALID_LBAM | IDE_VALID_LBAH);
356
357 *bcount = (tf.lbah << 8) | tf.lbam;
358 *ireason = tf.nsect & 3;
359}
360EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason);
361
362/*
363 * Check the contents of the interrupt reason register and attempt to recover if
364 * there are problems.
365 *
366 * Returns:
367 * - 0 if everything's ok
368 * - 1 if the request has to be terminated.
369 */
370int ide_check_ireason(ide_drive_t *drive, struct request *rq, int len,
371 int ireason, int rw)
372{
373 ide_hwif_t *hwif = drive->hwif;
374
375 debug_log("ireason: 0x%x, rw: 0x%x\n", ireason, rw);
376
377 if (ireason == (!rw << 1))
378 return 0;
379 else if (ireason == (rw << 1)) {
380 printk(KERN_ERR PFX "%s: %s: wrong transfer direction!\n",
381 drive->name, __func__);
382
383 if (dev_is_idecd(drive))
384 ide_pad_transfer(drive, rw, len);
385 } else if (!rw && ireason == ATAPI_COD) {
386 if (dev_is_idecd(drive)) {
387 /*
388 * Some drives (ASUS) seem to tell us that status info
389 * is available. Just get it and ignore.
390 */
391 (void)hwif->tp_ops->read_status(hwif);
392 return 0;
393 }
394 } else {
395 if (ireason & ATAPI_COD)
396 printk(KERN_ERR PFX "%s: CoD != 0 in %s\n", drive->name,
397 __func__);
398
399 /* drive wants a command packet, or invalid ireason... */
400 printk(KERN_ERR PFX "%s: %s: bad interrupt reason 0x%02x\n",
401 drive->name, __func__, ireason);
402 }
403
404 if (dev_is_idecd(drive) && ata_pc_request(rq))
405 rq->rq_flags |= RQF_FAILED;
406
407 return 1;
408}
409EXPORT_SYMBOL_GPL(ide_check_ireason);
410
411/*
412 * This is the usual interrupt handler which will be called during a packet
413 * command. We will transfer some of the data (as requested by the drive)
414 * and will re-point interrupt handler to us.
415 */
416static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
417{
418 struct ide_atapi_pc *pc = drive->pc;
419 ide_hwif_t *hwif = drive->hwif;
420 struct ide_cmd *cmd = &hwif->cmd;
421 struct request *rq = hwif->rq;
422 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
423 unsigned int timeout, done;
424 u16 bcount;
425 u8 stat, ireason, dsc = 0;
426 u8 write = !!(pc->flags & PC_FLAG_WRITING);
427
428 debug_log("Enter %s - interrupt handler\n", __func__);
429
430 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
431 : WAIT_TAPE_CMD;
432
433 /* Clear the interrupt */
434 stat = tp_ops->read_status(hwif);
435
436 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
437 int rc;
438
439 drive->waiting_for_dma = 0;
440 rc = hwif->dma_ops->dma_end(drive);
441 ide_dma_unmap_sg(drive, cmd);
442
443 if (rc || (drive->media == ide_tape && (stat & ATA_ERR))) {
444 if (drive->media == ide_floppy)
445 printk(KERN_ERR PFX "%s: DMA %s error\n",
446 drive->name, rq_data_dir(pc->rq)
447 ? "write" : "read");
448 pc->flags |= PC_FLAG_DMA_ERROR;
449 } else
450 scsi_req(rq)->resid_len = 0;
451 debug_log("%s: DMA finished\n", drive->name);
452 }
453
454 /* No more interrupts */
455 if ((stat & ATA_DRQ) == 0) {
456 int uptodate;
457 blk_status_t error;
458
459 debug_log("Packet command completed, %d bytes transferred\n",
460 blk_rq_bytes(rq));
461
462 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
463
464 local_irq_enable_in_hardirq();
465
466 if (drive->media == ide_tape &&
467 (stat & ATA_ERR) && scsi_req(rq)->cmd[0] == REQUEST_SENSE)
468 stat &= ~ATA_ERR;
469
470 if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) {
471 /* Error detected */
472 debug_log("%s: I/O error\n", drive->name);
473
474 if (drive->media != ide_tape)
475 scsi_req(pc->rq)->result++;
476
477 if (scsi_req(rq)->cmd[0] == REQUEST_SENSE) {
478 printk(KERN_ERR PFX "%s: I/O error in request "
479 "sense command\n", drive->name);
480 return ide_do_reset(drive);
481 }
482
483 debug_log("[cmd %x]: check condition\n", scsi_req(rq)->cmd[0]);
484
485 /* Retry operation */
486 ide_retry_pc(drive);
487
488 /* queued, but not started */
489 return ide_stopped;
490 }
491 pc->error = 0;
492
493 if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0)
494 dsc = 1;
495
496 /*
497 * ->pc_callback() might change rq->data_len for
498 * residual count, cache total length.
499 */
500 done = blk_rq_bytes(rq);
501
502 /* Command finished - Call the callback function */
503 uptodate = drive->pc_callback(drive, dsc);
504
505 if (uptodate == 0)
506 drive->failed_pc = NULL;
507
508 if (ata_misc_request(rq)) {
509 scsi_req(rq)->result = 0;
510 error = BLK_STS_OK;
511 } else {
512
513 if (blk_rq_is_passthrough(rq) && uptodate <= 0) {
514 if (scsi_req(rq)->result == 0)
515 scsi_req(rq)->result = -EIO;
516 }
517
518 error = uptodate ? BLK_STS_OK : BLK_STS_IOERR;
519 }
520
521 ide_complete_rq(drive, error, blk_rq_bytes(rq));
522 return ide_stopped;
523 }
524
525 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
526 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
527 printk(KERN_ERR PFX "%s: The device wants to issue more "
528 "interrupts in DMA mode\n", drive->name);
529 ide_dma_off(drive);
530 return ide_do_reset(drive);
531 }
532
533 /* Get the number of bytes to transfer on this interrupt. */
534 ide_read_bcount_and_ireason(drive, &bcount, &ireason);
535
536 if (ide_check_ireason(drive, rq, bcount, ireason, write))
537 return ide_do_reset(drive);
538
539 done = min_t(unsigned int, bcount, cmd->nleft);
540 ide_pio_bytes(drive, cmd, write, done);
541
542 /* Update transferred byte count */
543 scsi_req(rq)->resid_len -= done;
544
545 bcount -= done;
546
547 if (bcount)
548 ide_pad_transfer(drive, write, bcount);
549
550 debug_log("[cmd %x] transferred %d bytes, padded %d bytes, resid: %u\n",
551 scsi_req(rq)->cmd[0], done, bcount, scsi_req(rq)->resid_len);
552
553 /* And set the interrupt handler again */
554 ide_set_handler(drive, ide_pc_intr, timeout);
555 return ide_started;
556}
557
558static void ide_init_packet_cmd(struct ide_cmd *cmd, u8 valid_tf,
559 u16 bcount, u8 dma)
560{
561 cmd->protocol = dma ? ATAPI_PROT_DMA : ATAPI_PROT_PIO;
562 cmd->valid.out.tf = IDE_VALID_LBAH | IDE_VALID_LBAM |
563 IDE_VALID_FEATURE | valid_tf;
564 cmd->tf.command = ATA_CMD_PACKET;
565 cmd->tf.feature = dma; /* Use PIO/DMA */
566 cmd->tf.lbam = bcount & 0xff;
567 cmd->tf.lbah = (bcount >> 8) & 0xff;
568}
569
570static u8 ide_read_ireason(ide_drive_t *drive)
571{
572 struct ide_taskfile tf;
573
574 drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT);
575
576 return tf.nsect & 3;
577}
578
579static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
580{
581 int retries = 100;
582
583 while (retries-- && ((ireason & ATAPI_COD) == 0 ||
584 (ireason & ATAPI_IO))) {
585 printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing "
586 "a packet command, retrying\n", drive->name);
587 udelay(100);
588 ireason = ide_read_ireason(drive);
589 if (retries == 0) {
590 printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing"
591 " a packet command, ignoring\n",
592 drive->name);
593 ireason |= ATAPI_COD;
594 ireason &= ~ATAPI_IO;
595 }
596 }
597
598 return ireason;
599}
600
601static int ide_delayed_transfer_pc(ide_drive_t *drive)
602{
603 /* Send the actual packet */
604 drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12);
605
606 /* Timeout for the packet command */
607 return WAIT_FLOPPY_CMD;
608}
609
610static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
611{
612 struct ide_atapi_pc *pc;
613 ide_hwif_t *hwif = drive->hwif;
614 struct request *rq = hwif->rq;
615 ide_expiry_t *expiry;
616 unsigned int timeout;
617 int cmd_len;
618 ide_startstop_t startstop;
619 u8 ireason;
620
621 if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
622 printk(KERN_ERR PFX "%s: Strange, packet command initiated yet "
623 "DRQ isn't asserted\n", drive->name);
624 return startstop;
625 }
626
627 if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
628 if (drive->dma)
629 drive->waiting_for_dma = 1;
630 }
631
632 if (dev_is_idecd(drive)) {
633 /* ATAPI commands get padded out to 12 bytes minimum */
634 cmd_len = COMMAND_SIZE(scsi_req(rq)->cmd[0]);
635 if (cmd_len < ATAPI_MIN_CDB_BYTES)
636 cmd_len = ATAPI_MIN_CDB_BYTES;
637
638 timeout = rq->timeout;
639 expiry = ide_cd_expiry;
640 } else {
641 pc = drive->pc;
642
643 cmd_len = ATAPI_MIN_CDB_BYTES;
644
645 /*
646 * If necessary schedule the packet transfer to occur 'timeout'
647 * milliseconds later in ide_delayed_transfer_pc() after the
648 * device says it's ready for a packet.
649 */
650 if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) {
651 timeout = drive->pc_delay;
652 expiry = &ide_delayed_transfer_pc;
653 } else {
654 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
655 : WAIT_TAPE_CMD;
656 expiry = NULL;
657 }
658
659 ireason = ide_read_ireason(drive);
660 if (drive->media == ide_tape)
661 ireason = ide_wait_ireason(drive, ireason);
662
663 if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) {
664 printk(KERN_ERR PFX "%s: (IO,CoD) != (0,1) while "
665 "issuing a packet command\n", drive->name);
666
667 return ide_do_reset(drive);
668 }
669 }
670
671 hwif->expiry = expiry;
672
673 /* Set the interrupt routine */
674 ide_set_handler(drive,
675 (dev_is_idecd(drive) ? drive->irq_handler
676 : ide_pc_intr),
677 timeout);
678
679 /* Send the actual packet */
680 if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
681 hwif->tp_ops->output_data(drive, NULL, scsi_req(rq)->cmd, cmd_len);
682
683 /* Begin DMA, if necessary */
684 if (dev_is_idecd(drive)) {
685 if (drive->dma)
686 hwif->dma_ops->dma_start(drive);
687 } else {
688 if (pc->flags & PC_FLAG_DMA_OK) {
689 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
690 hwif->dma_ops->dma_start(drive);
691 }
692 }
693
694 return ide_started;
695}
696
697ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd)
698{
699 struct ide_atapi_pc *pc;
700 ide_hwif_t *hwif = drive->hwif;
701 ide_expiry_t *expiry = NULL;
702 struct request *rq = hwif->rq;
703 unsigned int timeout, bytes;
704 u16 bcount;
705 u8 valid_tf;
706 u8 drq_int = !!(drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT);
707
708 if (dev_is_idecd(drive)) {
709 valid_tf = IDE_VALID_NSECT | IDE_VALID_LBAL;
710 bcount = ide_cd_get_xferlen(rq);
711 expiry = ide_cd_expiry;
712 timeout = ATAPI_WAIT_PC;
713
714 if (drive->dma)
715 drive->dma = !ide_dma_prepare(drive, cmd);
716 } else {
717 pc = drive->pc;
718
719 valid_tf = IDE_VALID_DEVICE;
720 bytes = blk_rq_bytes(rq);
721 bcount = ((drive->media == ide_tape) ? bytes
722 : min_t(unsigned int,
723 bytes, 63 * 1024));
724
725 /* We haven't transferred any data yet */
726 scsi_req(rq)->resid_len = bcount;
727
728 if (pc->flags & PC_FLAG_DMA_ERROR) {
729 pc->flags &= ~PC_FLAG_DMA_ERROR;
730 ide_dma_off(drive);
731 }
732
733 if (pc->flags & PC_FLAG_DMA_OK)
734 drive->dma = !ide_dma_prepare(drive, cmd);
735
736 if (!drive->dma)
737 pc->flags &= ~PC_FLAG_DMA_OK;
738
739 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
740 : WAIT_TAPE_CMD;
741 }
742
743 ide_init_packet_cmd(cmd, valid_tf, bcount, drive->dma);
744
745 (void)do_rw_taskfile(drive, cmd);
746
747 if (drq_int) {
748 if (drive->dma)
749 drive->waiting_for_dma = 0;
750 hwif->expiry = expiry;
751 }
752
753 ide_execute_command(drive, cmd, ide_transfer_pc, timeout);
754
755 return drq_int ? ide_started : ide_transfer_pc(drive);
756}
757EXPORT_SYMBOL_GPL(ide_issue_pc);
1/*
2 * ATAPI support.
3 */
4
5#include <linux/kernel.h>
6#include <linux/cdrom.h>
7#include <linux/delay.h>
8#include <linux/export.h>
9#include <linux/ide.h>
10#include <linux/scatterlist.h>
11#include <linux/gfp.h>
12
13#include <scsi/scsi.h>
14
15#define DRV_NAME "ide-atapi"
16#define PFX DRV_NAME ": "
17
18#ifdef DEBUG
19#define debug_log(fmt, args...) \
20 printk(KERN_INFO "ide: " fmt, ## args)
21#else
22#define debug_log(fmt, args...) do {} while (0)
23#endif
24
25#define ATAPI_MIN_CDB_BYTES 12
26
27static inline int dev_is_idecd(ide_drive_t *drive)
28{
29 return drive->media == ide_cdrom || drive->media == ide_optical;
30}
31
32/*
33 * Check whether we can support a device,
34 * based on the ATAPI IDENTIFY command results.
35 */
36int ide_check_atapi_device(ide_drive_t *drive, const char *s)
37{
38 u16 *id = drive->id;
39 u8 gcw[2], protocol, device_type, removable, drq_type, packet_size;
40
41 *((u16 *)&gcw) = id[ATA_ID_CONFIG];
42
43 protocol = (gcw[1] & 0xC0) >> 6;
44 device_type = gcw[1] & 0x1F;
45 removable = (gcw[0] & 0x80) >> 7;
46 drq_type = (gcw[0] & 0x60) >> 5;
47 packet_size = gcw[0] & 0x03;
48
49#ifdef CONFIG_PPC
50 /* kludge for Apple PowerBook internal zip */
51 if (drive->media == ide_floppy && device_type == 5 &&
52 !strstr((char *)&id[ATA_ID_PROD], "CD-ROM") &&
53 strstr((char *)&id[ATA_ID_PROD], "ZIP"))
54 device_type = 0;
55#endif
56
57 if (protocol != 2)
58 printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n",
59 s, drive->name, protocol);
60 else if ((drive->media == ide_floppy && device_type != 0) ||
61 (drive->media == ide_tape && device_type != 1))
62 printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n",
63 s, drive->name, device_type);
64 else if (removable == 0)
65 printk(KERN_ERR "%s: %s: the removable flag is not set\n",
66 s, drive->name);
67 else if (drive->media == ide_floppy && drq_type == 3)
68 printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not "
69 "supported\n", s, drive->name, drq_type);
70 else if (packet_size != 0)
71 printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 "
72 "bytes\n", s, drive->name, packet_size);
73 else
74 return 1;
75 return 0;
76}
77EXPORT_SYMBOL_GPL(ide_check_atapi_device);
78
79void ide_init_pc(struct ide_atapi_pc *pc)
80{
81 memset(pc, 0, sizeof(*pc));
82}
83EXPORT_SYMBOL_GPL(ide_init_pc);
84
85/*
86 * Add a special packet command request to the tail of the request queue,
87 * and wait for it to be serviced.
88 */
89int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk,
90 struct ide_atapi_pc *pc, void *buf, unsigned int bufflen)
91{
92 struct request *rq;
93 int error;
94
95 rq = blk_get_request(drive->queue, READ, __GFP_RECLAIM);
96 rq->cmd_type = REQ_TYPE_DRV_PRIV;
97 rq->special = (char *)pc;
98
99 if (buf && bufflen) {
100 error = blk_rq_map_kern(drive->queue, rq, buf, bufflen,
101 GFP_NOIO);
102 if (error)
103 goto put_req;
104 }
105
106 memcpy(rq->cmd, pc->c, 12);
107 if (drive->media == ide_tape)
108 rq->cmd[13] = REQ_IDETAPE_PC1;
109 error = blk_execute_rq(drive->queue, disk, rq, 0);
110put_req:
111 blk_put_request(rq);
112 return error;
113}
114EXPORT_SYMBOL_GPL(ide_queue_pc_tail);
115
116int ide_do_test_unit_ready(ide_drive_t *drive, struct gendisk *disk)
117{
118 struct ide_atapi_pc pc;
119
120 ide_init_pc(&pc);
121 pc.c[0] = TEST_UNIT_READY;
122
123 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
124}
125EXPORT_SYMBOL_GPL(ide_do_test_unit_ready);
126
127int ide_do_start_stop(ide_drive_t *drive, struct gendisk *disk, int start)
128{
129 struct ide_atapi_pc pc;
130
131 ide_init_pc(&pc);
132 pc.c[0] = START_STOP;
133 pc.c[4] = start;
134
135 if (drive->media == ide_tape)
136 pc.flags |= PC_FLAG_WAIT_FOR_DSC;
137
138 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
139}
140EXPORT_SYMBOL_GPL(ide_do_start_stop);
141
142int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on)
143{
144 struct ide_atapi_pc pc;
145
146 if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0)
147 return 0;
148
149 ide_init_pc(&pc);
150 pc.c[0] = ALLOW_MEDIUM_REMOVAL;
151 pc.c[4] = on;
152
153 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
154}
155EXPORT_SYMBOL_GPL(ide_set_media_lock);
156
157void ide_create_request_sense_cmd(ide_drive_t *drive, struct ide_atapi_pc *pc)
158{
159 ide_init_pc(pc);
160 pc->c[0] = REQUEST_SENSE;
161 if (drive->media == ide_floppy) {
162 pc->c[4] = 255;
163 pc->req_xfer = 18;
164 } else {
165 pc->c[4] = 20;
166 pc->req_xfer = 20;
167 }
168}
169EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd);
170
171void ide_prep_sense(ide_drive_t *drive, struct request *rq)
172{
173 struct request_sense *sense = &drive->sense_data;
174 struct request *sense_rq = &drive->sense_rq;
175 unsigned int cmd_len, sense_len;
176 int err;
177
178 switch (drive->media) {
179 case ide_floppy:
180 cmd_len = 255;
181 sense_len = 18;
182 break;
183 case ide_tape:
184 cmd_len = 20;
185 sense_len = 20;
186 break;
187 default:
188 cmd_len = 18;
189 sense_len = 18;
190 }
191
192 BUG_ON(sense_len > sizeof(*sense));
193
194 if (rq->cmd_type == REQ_TYPE_ATA_SENSE || drive->sense_rq_armed)
195 return;
196
197 memset(sense, 0, sizeof(*sense));
198
199 blk_rq_init(rq->q, sense_rq);
200
201 err = blk_rq_map_kern(drive->queue, sense_rq, sense, sense_len,
202 GFP_NOIO);
203 if (unlikely(err)) {
204 if (printk_ratelimit())
205 printk(KERN_WARNING PFX "%s: failed to map sense "
206 "buffer\n", drive->name);
207 return;
208 }
209
210 sense_rq->rq_disk = rq->rq_disk;
211 sense_rq->cmd[0] = GPCMD_REQUEST_SENSE;
212 sense_rq->cmd[4] = cmd_len;
213 sense_rq->cmd_type = REQ_TYPE_ATA_SENSE;
214 sense_rq->cmd_flags |= REQ_PREEMPT;
215
216 if (drive->media == ide_tape)
217 sense_rq->cmd[13] = REQ_IDETAPE_PC1;
218
219 drive->sense_rq_armed = true;
220}
221EXPORT_SYMBOL_GPL(ide_prep_sense);
222
223int ide_queue_sense_rq(ide_drive_t *drive, void *special)
224{
225 /* deferred failure from ide_prep_sense() */
226 if (!drive->sense_rq_armed) {
227 printk(KERN_WARNING PFX "%s: error queuing a sense request\n",
228 drive->name);
229 return -ENOMEM;
230 }
231
232 drive->sense_rq.special = special;
233 drive->sense_rq_armed = false;
234
235 drive->hwif->rq = NULL;
236
237 elv_add_request(drive->queue, &drive->sense_rq, ELEVATOR_INSERT_FRONT);
238 return 0;
239}
240EXPORT_SYMBOL_GPL(ide_queue_sense_rq);
241
242/*
243 * Called when an error was detected during the last packet command.
244 * We queue a request sense packet command at the head of the request
245 * queue.
246 */
247void ide_retry_pc(ide_drive_t *drive)
248{
249 struct request *failed_rq = drive->hwif->rq;
250 struct request *sense_rq = &drive->sense_rq;
251 struct ide_atapi_pc *pc = &drive->request_sense_pc;
252
253 (void)ide_read_error(drive);
254
255 /* init pc from sense_rq */
256 ide_init_pc(pc);
257 memcpy(pc->c, sense_rq->cmd, 12);
258
259 if (drive->media == ide_tape)
260 drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC;
261
262 /*
263 * Push back the failed request and put request sense on top
264 * of it. The failed command will be retried after sense data
265 * is acquired.
266 */
267 drive->hwif->rq = NULL;
268 ide_requeue_and_plug(drive, failed_rq);
269 if (ide_queue_sense_rq(drive, pc)) {
270 blk_start_request(failed_rq);
271 ide_complete_rq(drive, -EIO, blk_rq_bytes(failed_rq));
272 }
273}
274EXPORT_SYMBOL_GPL(ide_retry_pc);
275
276int ide_cd_expiry(ide_drive_t *drive)
277{
278 struct request *rq = drive->hwif->rq;
279 unsigned long wait = 0;
280
281 debug_log("%s: rq->cmd[0]: 0x%x\n", __func__, rq->cmd[0]);
282
283 /*
284 * Some commands are *slow* and normally take a long time to complete.
285 * Usually we can use the ATAPI "disconnect" to bypass this, but not all
286 * commands/drives support that. Let ide_timer_expiry keep polling us
287 * for these.
288 */
289 switch (rq->cmd[0]) {
290 case GPCMD_BLANK:
291 case GPCMD_FORMAT_UNIT:
292 case GPCMD_RESERVE_RZONE_TRACK:
293 case GPCMD_CLOSE_TRACK:
294 case GPCMD_FLUSH_CACHE:
295 wait = ATAPI_WAIT_PC;
296 break;
297 default:
298 if (!(rq->cmd_flags & REQ_QUIET))
299 printk(KERN_INFO PFX "cmd 0x%x timed out\n",
300 rq->cmd[0]);
301 wait = 0;
302 break;
303 }
304 return wait;
305}
306EXPORT_SYMBOL_GPL(ide_cd_expiry);
307
308int ide_cd_get_xferlen(struct request *rq)
309{
310 switch (rq->cmd_type) {
311 case REQ_TYPE_FS:
312 return 32768;
313 case REQ_TYPE_ATA_SENSE:
314 case REQ_TYPE_BLOCK_PC:
315 case REQ_TYPE_ATA_PC:
316 return blk_rq_bytes(rq);
317 default:
318 return 0;
319 }
320}
321EXPORT_SYMBOL_GPL(ide_cd_get_xferlen);
322
323void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason)
324{
325 struct ide_taskfile tf;
326
327 drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT |
328 IDE_VALID_LBAM | IDE_VALID_LBAH);
329
330 *bcount = (tf.lbah << 8) | tf.lbam;
331 *ireason = tf.nsect & 3;
332}
333EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason);
334
335/*
336 * Check the contents of the interrupt reason register and attempt to recover if
337 * there are problems.
338 *
339 * Returns:
340 * - 0 if everything's ok
341 * - 1 if the request has to be terminated.
342 */
343int ide_check_ireason(ide_drive_t *drive, struct request *rq, int len,
344 int ireason, int rw)
345{
346 ide_hwif_t *hwif = drive->hwif;
347
348 debug_log("ireason: 0x%x, rw: 0x%x\n", ireason, rw);
349
350 if (ireason == (!rw << 1))
351 return 0;
352 else if (ireason == (rw << 1)) {
353 printk(KERN_ERR PFX "%s: %s: wrong transfer direction!\n",
354 drive->name, __func__);
355
356 if (dev_is_idecd(drive))
357 ide_pad_transfer(drive, rw, len);
358 } else if (!rw && ireason == ATAPI_COD) {
359 if (dev_is_idecd(drive)) {
360 /*
361 * Some drives (ASUS) seem to tell us that status info
362 * is available. Just get it and ignore.
363 */
364 (void)hwif->tp_ops->read_status(hwif);
365 return 0;
366 }
367 } else {
368 if (ireason & ATAPI_COD)
369 printk(KERN_ERR PFX "%s: CoD != 0 in %s\n", drive->name,
370 __func__);
371
372 /* drive wants a command packet, or invalid ireason... */
373 printk(KERN_ERR PFX "%s: %s: bad interrupt reason 0x%02x\n",
374 drive->name, __func__, ireason);
375 }
376
377 if (dev_is_idecd(drive) && rq->cmd_type == REQ_TYPE_ATA_PC)
378 rq->cmd_flags |= REQ_FAILED;
379
380 return 1;
381}
382EXPORT_SYMBOL_GPL(ide_check_ireason);
383
384/*
385 * This is the usual interrupt handler which will be called during a packet
386 * command. We will transfer some of the data (as requested by the drive)
387 * and will re-point interrupt handler to us.
388 */
389static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
390{
391 struct ide_atapi_pc *pc = drive->pc;
392 ide_hwif_t *hwif = drive->hwif;
393 struct ide_cmd *cmd = &hwif->cmd;
394 struct request *rq = hwif->rq;
395 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
396 unsigned int timeout, done;
397 u16 bcount;
398 u8 stat, ireason, dsc = 0;
399 u8 write = !!(pc->flags & PC_FLAG_WRITING);
400
401 debug_log("Enter %s - interrupt handler\n", __func__);
402
403 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
404 : WAIT_TAPE_CMD;
405
406 /* Clear the interrupt */
407 stat = tp_ops->read_status(hwif);
408
409 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
410 int rc;
411
412 drive->waiting_for_dma = 0;
413 rc = hwif->dma_ops->dma_end(drive);
414 ide_dma_unmap_sg(drive, cmd);
415
416 if (rc || (drive->media == ide_tape && (stat & ATA_ERR))) {
417 if (drive->media == ide_floppy)
418 printk(KERN_ERR PFX "%s: DMA %s error\n",
419 drive->name, rq_data_dir(pc->rq)
420 ? "write" : "read");
421 pc->flags |= PC_FLAG_DMA_ERROR;
422 } else
423 rq->resid_len = 0;
424 debug_log("%s: DMA finished\n", drive->name);
425 }
426
427 /* No more interrupts */
428 if ((stat & ATA_DRQ) == 0) {
429 int uptodate, error;
430
431 debug_log("Packet command completed, %d bytes transferred\n",
432 blk_rq_bytes(rq));
433
434 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
435
436 local_irq_enable_in_hardirq();
437
438 if (drive->media == ide_tape &&
439 (stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE)
440 stat &= ~ATA_ERR;
441
442 if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) {
443 /* Error detected */
444 debug_log("%s: I/O error\n", drive->name);
445
446 if (drive->media != ide_tape)
447 pc->rq->errors++;
448
449 if (rq->cmd[0] == REQUEST_SENSE) {
450 printk(KERN_ERR PFX "%s: I/O error in request "
451 "sense command\n", drive->name);
452 return ide_do_reset(drive);
453 }
454
455 debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
456
457 /* Retry operation */
458 ide_retry_pc(drive);
459
460 /* queued, but not started */
461 return ide_stopped;
462 }
463 pc->error = 0;
464
465 if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0)
466 dsc = 1;
467
468 /*
469 * ->pc_callback() might change rq->data_len for
470 * residual count, cache total length.
471 */
472 done = blk_rq_bytes(rq);
473
474 /* Command finished - Call the callback function */
475 uptodate = drive->pc_callback(drive, dsc);
476
477 if (uptodate == 0)
478 drive->failed_pc = NULL;
479
480 if (rq->cmd_type == REQ_TYPE_DRV_PRIV) {
481 rq->errors = 0;
482 error = 0;
483 } else {
484
485 if (rq->cmd_type != REQ_TYPE_FS && uptodate <= 0) {
486 if (rq->errors == 0)
487 rq->errors = -EIO;
488 }
489
490 error = uptodate ? 0 : -EIO;
491 }
492
493 ide_complete_rq(drive, error, blk_rq_bytes(rq));
494 return ide_stopped;
495 }
496
497 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
498 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
499 printk(KERN_ERR PFX "%s: The device wants to issue more "
500 "interrupts in DMA mode\n", drive->name);
501 ide_dma_off(drive);
502 return ide_do_reset(drive);
503 }
504
505 /* Get the number of bytes to transfer on this interrupt. */
506 ide_read_bcount_and_ireason(drive, &bcount, &ireason);
507
508 if (ide_check_ireason(drive, rq, bcount, ireason, write))
509 return ide_do_reset(drive);
510
511 done = min_t(unsigned int, bcount, cmd->nleft);
512 ide_pio_bytes(drive, cmd, write, done);
513
514 /* Update transferred byte count */
515 rq->resid_len -= done;
516
517 bcount -= done;
518
519 if (bcount)
520 ide_pad_transfer(drive, write, bcount);
521
522 debug_log("[cmd %x] transferred %d bytes, padded %d bytes, resid: %u\n",
523 rq->cmd[0], done, bcount, rq->resid_len);
524
525 /* And set the interrupt handler again */
526 ide_set_handler(drive, ide_pc_intr, timeout);
527 return ide_started;
528}
529
530static void ide_init_packet_cmd(struct ide_cmd *cmd, u8 valid_tf,
531 u16 bcount, u8 dma)
532{
533 cmd->protocol = dma ? ATAPI_PROT_DMA : ATAPI_PROT_PIO;
534 cmd->valid.out.tf = IDE_VALID_LBAH | IDE_VALID_LBAM |
535 IDE_VALID_FEATURE | valid_tf;
536 cmd->tf.command = ATA_CMD_PACKET;
537 cmd->tf.feature = dma; /* Use PIO/DMA */
538 cmd->tf.lbam = bcount & 0xff;
539 cmd->tf.lbah = (bcount >> 8) & 0xff;
540}
541
542static u8 ide_read_ireason(ide_drive_t *drive)
543{
544 struct ide_taskfile tf;
545
546 drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT);
547
548 return tf.nsect & 3;
549}
550
551static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
552{
553 int retries = 100;
554
555 while (retries-- && ((ireason & ATAPI_COD) == 0 ||
556 (ireason & ATAPI_IO))) {
557 printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing "
558 "a packet command, retrying\n", drive->name);
559 udelay(100);
560 ireason = ide_read_ireason(drive);
561 if (retries == 0) {
562 printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing"
563 " a packet command, ignoring\n",
564 drive->name);
565 ireason |= ATAPI_COD;
566 ireason &= ~ATAPI_IO;
567 }
568 }
569
570 return ireason;
571}
572
573static int ide_delayed_transfer_pc(ide_drive_t *drive)
574{
575 /* Send the actual packet */
576 drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12);
577
578 /* Timeout for the packet command */
579 return WAIT_FLOPPY_CMD;
580}
581
582static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
583{
584 struct ide_atapi_pc *uninitialized_var(pc);
585 ide_hwif_t *hwif = drive->hwif;
586 struct request *rq = hwif->rq;
587 ide_expiry_t *expiry;
588 unsigned int timeout;
589 int cmd_len;
590 ide_startstop_t startstop;
591 u8 ireason;
592
593 if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
594 printk(KERN_ERR PFX "%s: Strange, packet command initiated yet "
595 "DRQ isn't asserted\n", drive->name);
596 return startstop;
597 }
598
599 if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
600 if (drive->dma)
601 drive->waiting_for_dma = 1;
602 }
603
604 if (dev_is_idecd(drive)) {
605 /* ATAPI commands get padded out to 12 bytes minimum */
606 cmd_len = COMMAND_SIZE(rq->cmd[0]);
607 if (cmd_len < ATAPI_MIN_CDB_BYTES)
608 cmd_len = ATAPI_MIN_CDB_BYTES;
609
610 timeout = rq->timeout;
611 expiry = ide_cd_expiry;
612 } else {
613 pc = drive->pc;
614
615 cmd_len = ATAPI_MIN_CDB_BYTES;
616
617 /*
618 * If necessary schedule the packet transfer to occur 'timeout'
619 * milliseconds later in ide_delayed_transfer_pc() after the
620 * device says it's ready for a packet.
621 */
622 if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) {
623 timeout = drive->pc_delay;
624 expiry = &ide_delayed_transfer_pc;
625 } else {
626 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
627 : WAIT_TAPE_CMD;
628 expiry = NULL;
629 }
630
631 ireason = ide_read_ireason(drive);
632 if (drive->media == ide_tape)
633 ireason = ide_wait_ireason(drive, ireason);
634
635 if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) {
636 printk(KERN_ERR PFX "%s: (IO,CoD) != (0,1) while "
637 "issuing a packet command\n", drive->name);
638
639 return ide_do_reset(drive);
640 }
641 }
642
643 hwif->expiry = expiry;
644
645 /* Set the interrupt routine */
646 ide_set_handler(drive,
647 (dev_is_idecd(drive) ? drive->irq_handler
648 : ide_pc_intr),
649 timeout);
650
651 /* Send the actual packet */
652 if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
653 hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);
654
655 /* Begin DMA, if necessary */
656 if (dev_is_idecd(drive)) {
657 if (drive->dma)
658 hwif->dma_ops->dma_start(drive);
659 } else {
660 if (pc->flags & PC_FLAG_DMA_OK) {
661 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
662 hwif->dma_ops->dma_start(drive);
663 }
664 }
665
666 return ide_started;
667}
668
669ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd)
670{
671 struct ide_atapi_pc *pc;
672 ide_hwif_t *hwif = drive->hwif;
673 ide_expiry_t *expiry = NULL;
674 struct request *rq = hwif->rq;
675 unsigned int timeout, bytes;
676 u16 bcount;
677 u8 valid_tf;
678 u8 drq_int = !!(drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT);
679
680 if (dev_is_idecd(drive)) {
681 valid_tf = IDE_VALID_NSECT | IDE_VALID_LBAL;
682 bcount = ide_cd_get_xferlen(rq);
683 expiry = ide_cd_expiry;
684 timeout = ATAPI_WAIT_PC;
685
686 if (drive->dma)
687 drive->dma = !ide_dma_prepare(drive, cmd);
688 } else {
689 pc = drive->pc;
690
691 valid_tf = IDE_VALID_DEVICE;
692 bytes = blk_rq_bytes(rq);
693 bcount = ((drive->media == ide_tape) ? bytes
694 : min_t(unsigned int,
695 bytes, 63 * 1024));
696
697 /* We haven't transferred any data yet */
698 rq->resid_len = bcount;
699
700 if (pc->flags & PC_FLAG_DMA_ERROR) {
701 pc->flags &= ~PC_FLAG_DMA_ERROR;
702 ide_dma_off(drive);
703 }
704
705 if (pc->flags & PC_FLAG_DMA_OK)
706 drive->dma = !ide_dma_prepare(drive, cmd);
707
708 if (!drive->dma)
709 pc->flags &= ~PC_FLAG_DMA_OK;
710
711 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
712 : WAIT_TAPE_CMD;
713 }
714
715 ide_init_packet_cmd(cmd, valid_tf, bcount, drive->dma);
716
717 (void)do_rw_taskfile(drive, cmd);
718
719 if (drq_int) {
720 if (drive->dma)
721 drive->waiting_for_dma = 0;
722 hwif->expiry = expiry;
723 }
724
725 ide_execute_command(drive, cmd, ide_transfer_pc, timeout);
726
727 return drq_int ? ide_started : ide_transfer_pc(drive);
728}
729EXPORT_SYMBOL_GPL(ide_issue_pc);