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