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 <scsi/scsi.h>
10
11 #ifdef DEBUG
12 #define debug_log(fmt, args...) \
13 printk(KERN_INFO "ide: " fmt, ## args)
14 #else
15 #define debug_log(fmt, args...) do {} while (0)
16 #endif
17
18 #define ATAPI_MIN_CDB_BYTES 12
19
dev_is_idecd(ide_drive_t * drive)20 static inline int dev_is_idecd(ide_drive_t *drive)
21 {
22 return drive->media == ide_cdrom || drive->media == ide_optical;
23 }
24
25 /*
26 * Check whether we can support a device,
27 * based on the ATAPI IDENTIFY command results.
28 */
ide_check_atapi_device(ide_drive_t * drive,const char * s)29 int ide_check_atapi_device(ide_drive_t *drive, const char *s)
30 {
31 u16 *id = drive->id;
32 u8 gcw[2], protocol, device_type, removable, drq_type, packet_size;
33
34 *((u16 *)&gcw) = id[ATA_ID_CONFIG];
35
36 protocol = (gcw[1] & 0xC0) >> 6;
37 device_type = gcw[1] & 0x1F;
38 removable = (gcw[0] & 0x80) >> 7;
39 drq_type = (gcw[0] & 0x60) >> 5;
40 packet_size = gcw[0] & 0x03;
41
42 #ifdef CONFIG_PPC
43 /* kludge for Apple PowerBook internal zip */
44 if (drive->media == ide_floppy && device_type == 5 &&
45 !strstr((char *)&id[ATA_ID_PROD], "CD-ROM") &&
46 strstr((char *)&id[ATA_ID_PROD], "ZIP"))
47 device_type = 0;
48 #endif
49
50 if (protocol != 2)
51 printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n",
52 s, drive->name, protocol);
53 else if ((drive->media == ide_floppy && device_type != 0) ||
54 (drive->media == ide_tape && device_type != 1))
55 printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n",
56 s, drive->name, device_type);
57 else if (removable == 0)
58 printk(KERN_ERR "%s: %s: the removable flag is not set\n",
59 s, drive->name);
60 else if (drive->media == ide_floppy && drq_type == 3)
61 printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not "
62 "supported\n", s, drive->name, drq_type);
63 else if (packet_size != 0)
64 printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 "
65 "bytes\n", s, drive->name, packet_size);
66 else
67 return 1;
68 return 0;
69 }
70 EXPORT_SYMBOL_GPL(ide_check_atapi_device);
71
72 /* PIO data transfer routine using the scatter gather table. */
ide_io_buffers(ide_drive_t * drive,struct ide_atapi_pc * pc,unsigned int bcount,int write)73 int ide_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
74 unsigned int bcount, int write)
75 {
76 ide_hwif_t *hwif = drive->hwif;
77 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
78 xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data;
79 struct scatterlist *sg = pc->sg;
80 char *buf;
81 int count, done = 0;
82
83 while (bcount) {
84 count = min(sg->length - pc->b_count, bcount);
85
86 if (PageHighMem(sg_page(sg))) {
87 unsigned long flags;
88
89 local_irq_save(flags);
90 buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
91 xf(drive, NULL, buf + pc->b_count, count);
92 kunmap_atomic(buf - sg->offset, KM_IRQ0);
93 local_irq_restore(flags);
94 } else {
95 buf = sg_virt(sg);
96 xf(drive, NULL, buf + pc->b_count, count);
97 }
98
99 bcount -= count;
100 pc->b_count += count;
101 done += count;
102
103 if (pc->b_count == sg->length) {
104 if (!--pc->sg_cnt)
105 break;
106 pc->sg = sg = sg_next(sg);
107 pc->b_count = 0;
108 }
109 }
110
111 if (bcount) {
112 printk(KERN_ERR "%s: %d leftover bytes, %s\n", drive->name,
113 bcount, write ? "padding with zeros"
114 : "discarding data");
115 ide_pad_transfer(drive, write, bcount);
116 }
117
118 return done;
119 }
120 EXPORT_SYMBOL_GPL(ide_io_buffers);
121
ide_init_pc(struct ide_atapi_pc * pc)122 void ide_init_pc(struct ide_atapi_pc *pc)
123 {
124 memset(pc, 0, sizeof(*pc));
125 pc->buf = pc->pc_buf;
126 pc->buf_size = IDE_PC_BUFFER_SIZE;
127 }
128 EXPORT_SYMBOL_GPL(ide_init_pc);
129
130 /*
131 * Generate a new packet command request in front of the request queue, before
132 * the current request, so that it will be processed immediately, on the next
133 * pass through the driver.
134 */
ide_queue_pc_head(ide_drive_t * drive,struct gendisk * disk,struct ide_atapi_pc * pc,struct request * rq)135 static void ide_queue_pc_head(ide_drive_t *drive, struct gendisk *disk,
136 struct ide_atapi_pc *pc, struct request *rq)
137 {
138 blk_rq_init(NULL, rq);
139 rq->cmd_type = REQ_TYPE_SPECIAL;
140 rq->cmd_flags |= REQ_PREEMPT;
141 rq->buffer = (char *)pc;
142 rq->rq_disk = disk;
143
144 if (pc->req_xfer) {
145 rq->data = pc->buf;
146 rq->data_len = pc->req_xfer;
147 }
148
149 memcpy(rq->cmd, pc->c, 12);
150 if (drive->media == ide_tape)
151 rq->cmd[13] = REQ_IDETAPE_PC1;
152 ide_do_drive_cmd(drive, rq);
153 }
154
155 /*
156 * Add a special packet command request to the tail of the request queue,
157 * and wait for it to be serviced.
158 */
ide_queue_pc_tail(ide_drive_t * drive,struct gendisk * disk,struct ide_atapi_pc * pc)159 int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk,
160 struct ide_atapi_pc *pc)
161 {
162 struct request *rq;
163 int error;
164
165 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
166 rq->cmd_type = REQ_TYPE_SPECIAL;
167 rq->buffer = (char *)pc;
168
169 if (pc->req_xfer) {
170 rq->data = pc->buf;
171 rq->data_len = pc->req_xfer;
172 }
173
174 memcpy(rq->cmd, pc->c, 12);
175 if (drive->media == ide_tape)
176 rq->cmd[13] = REQ_IDETAPE_PC1;
177 error = blk_execute_rq(drive->queue, disk, rq, 0);
178 blk_put_request(rq);
179
180 return error;
181 }
182 EXPORT_SYMBOL_GPL(ide_queue_pc_tail);
183
ide_do_test_unit_ready(ide_drive_t * drive,struct gendisk * disk)184 int ide_do_test_unit_ready(ide_drive_t *drive, struct gendisk *disk)
185 {
186 struct ide_atapi_pc pc;
187
188 ide_init_pc(&pc);
189 pc.c[0] = TEST_UNIT_READY;
190
191 return ide_queue_pc_tail(drive, disk, &pc);
192 }
193 EXPORT_SYMBOL_GPL(ide_do_test_unit_ready);
194
ide_do_start_stop(ide_drive_t * drive,struct gendisk * disk,int start)195 int ide_do_start_stop(ide_drive_t *drive, struct gendisk *disk, int start)
196 {
197 struct ide_atapi_pc pc;
198
199 ide_init_pc(&pc);
200 pc.c[0] = START_STOP;
201 pc.c[4] = start;
202
203 if (drive->media == ide_tape)
204 pc.flags |= PC_FLAG_WAIT_FOR_DSC;
205
206 return ide_queue_pc_tail(drive, disk, &pc);
207 }
208 EXPORT_SYMBOL_GPL(ide_do_start_stop);
209
ide_set_media_lock(ide_drive_t * drive,struct gendisk * disk,int on)210 int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on)
211 {
212 struct ide_atapi_pc pc;
213
214 if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0)
215 return 0;
216
217 ide_init_pc(&pc);
218 pc.c[0] = ALLOW_MEDIUM_REMOVAL;
219 pc.c[4] = on;
220
221 return ide_queue_pc_tail(drive, disk, &pc);
222 }
223 EXPORT_SYMBOL_GPL(ide_set_media_lock);
224
ide_create_request_sense_cmd(ide_drive_t * drive,struct ide_atapi_pc * pc)225 void ide_create_request_sense_cmd(ide_drive_t *drive, struct ide_atapi_pc *pc)
226 {
227 ide_init_pc(pc);
228 pc->c[0] = REQUEST_SENSE;
229 if (drive->media == ide_floppy) {
230 pc->c[4] = 255;
231 pc->req_xfer = 18;
232 } else {
233 pc->c[4] = 20;
234 pc->req_xfer = 20;
235 }
236 }
237 EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd);
238
239 /*
240 * Called when an error was detected during the last packet command.
241 * We queue a request sense packet command in the head of the request list.
242 */
ide_retry_pc(ide_drive_t * drive,struct gendisk * disk)243 void ide_retry_pc(ide_drive_t *drive, struct gendisk *disk)
244 {
245 struct request *rq = &drive->request_sense_rq;
246 struct ide_atapi_pc *pc = &drive->request_sense_pc;
247
248 (void)ide_read_error(drive);
249 ide_create_request_sense_cmd(drive, pc);
250 if (drive->media == ide_tape)
251 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
252 ide_queue_pc_head(drive, disk, pc, rq);
253 }
254 EXPORT_SYMBOL_GPL(ide_retry_pc);
255
ide_cd_expiry(ide_drive_t * drive)256 int ide_cd_expiry(ide_drive_t *drive)
257 {
258 struct request *rq = drive->hwif->rq;
259 unsigned long wait = 0;
260
261 debug_log("%s: rq->cmd[0]: 0x%x\n", __func__, rq->cmd[0]);
262
263 /*
264 * Some commands are *slow* and normally take a long time to complete.
265 * Usually we can use the ATAPI "disconnect" to bypass this, but not all
266 * commands/drives support that. Let ide_timer_expiry keep polling us
267 * for these.
268 */
269 switch (rq->cmd[0]) {
270 case GPCMD_BLANK:
271 case GPCMD_FORMAT_UNIT:
272 case GPCMD_RESERVE_RZONE_TRACK:
273 case GPCMD_CLOSE_TRACK:
274 case GPCMD_FLUSH_CACHE:
275 wait = ATAPI_WAIT_PC;
276 break;
277 default:
278 if (!(rq->cmd_flags & REQ_QUIET))
279 printk(KERN_INFO "cmd 0x%x timed out\n",
280 rq->cmd[0]);
281 wait = 0;
282 break;
283 }
284 return wait;
285 }
286 EXPORT_SYMBOL_GPL(ide_cd_expiry);
287
ide_cd_get_xferlen(struct request * rq)288 int ide_cd_get_xferlen(struct request *rq)
289 {
290 if (blk_fs_request(rq))
291 return 32768;
292 else if (blk_sense_request(rq) || blk_pc_request(rq) ||
293 rq->cmd_type == REQ_TYPE_ATA_PC)
294 return rq->data_len;
295 else
296 return 0;
297 }
298 EXPORT_SYMBOL_GPL(ide_cd_get_xferlen);
299
300 /*
301 * This is the usual interrupt handler which will be called during a packet
302 * command. We will transfer some of the data (as requested by the drive)
303 * and will re-point interrupt handler to us.
304 */
ide_pc_intr(ide_drive_t * drive)305 static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
306 {
307 struct ide_atapi_pc *pc = drive->pc;
308 ide_hwif_t *hwif = drive->hwif;
309 struct request *rq = hwif->rq;
310 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
311 xfer_func_t *xferfunc;
312 unsigned int timeout, temp;
313 u16 bcount;
314 u8 stat, ireason, dsc = 0;
315
316 debug_log("Enter %s - interrupt handler\n", __func__);
317
318 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
319 : WAIT_TAPE_CMD;
320
321 if (pc->flags & PC_FLAG_TIMEDOUT) {
322 drive->pc_callback(drive, 0);
323 return ide_stopped;
324 }
325
326 /* Clear the interrupt */
327 stat = tp_ops->read_status(hwif);
328
329 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
330 if (hwif->dma_ops->dma_end(drive) ||
331 (drive->media == ide_tape && (stat & ATA_ERR))) {
332 if (drive->media == ide_floppy)
333 printk(KERN_ERR "%s: DMA %s error\n",
334 drive->name, rq_data_dir(pc->rq)
335 ? "write" : "read");
336 pc->flags |= PC_FLAG_DMA_ERROR;
337 } else {
338 pc->xferred = pc->req_xfer;
339 if (drive->pc_update_buffers)
340 drive->pc_update_buffers(drive, pc);
341 }
342 debug_log("%s: DMA finished\n", drive->name);
343 }
344
345 /* No more interrupts */
346 if ((stat & ATA_DRQ) == 0) {
347 debug_log("Packet command completed, %d bytes transferred\n",
348 pc->xferred);
349
350 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
351
352 local_irq_enable_in_hardirq();
353
354 if (drive->media == ide_tape &&
355 (stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE)
356 stat &= ~ATA_ERR;
357
358 if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) {
359 /* Error detected */
360 debug_log("%s: I/O error\n", drive->name);
361
362 if (drive->media != ide_tape)
363 pc->rq->errors++;
364
365 if (rq->cmd[0] == REQUEST_SENSE) {
366 printk(KERN_ERR "%s: I/O error in request sense"
367 " command\n", drive->name);
368 return ide_do_reset(drive);
369 }
370
371 debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
372
373 /* Retry operation */
374 ide_retry_pc(drive, rq->rq_disk);
375
376 /* queued, but not started */
377 return ide_stopped;
378 }
379 pc->error = 0;
380
381 if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0)
382 dsc = 1;
383
384 /* Command finished - Call the callback function */
385 drive->pc_callback(drive, dsc);
386
387 return ide_stopped;
388 }
389
390 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
391 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
392 printk(KERN_ERR "%s: The device wants to issue more interrupts "
393 "in DMA mode\n", drive->name);
394 ide_dma_off(drive);
395 return ide_do_reset(drive);
396 }
397
398 /* Get the number of bytes to transfer on this interrupt. */
399 ide_read_bcount_and_ireason(drive, &bcount, &ireason);
400
401 if (ireason & ATAPI_COD) {
402 printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
403 return ide_do_reset(drive);
404 }
405
406 if (((ireason & ATAPI_IO) == ATAPI_IO) ==
407 !!(pc->flags & PC_FLAG_WRITING)) {
408 /* Hopefully, we will never get here */
409 printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
410 "to %s!\n", drive->name,
411 (ireason & ATAPI_IO) ? "Write" : "Read",
412 (ireason & ATAPI_IO) ? "Read" : "Write");
413 return ide_do_reset(drive);
414 }
415
416 if (!(pc->flags & PC_FLAG_WRITING)) {
417 /* Reading - Check that we have enough space */
418 temp = pc->xferred + bcount;
419 if (temp > pc->req_xfer) {
420 if (temp > pc->buf_size) {
421 printk(KERN_ERR "%s: The device wants to send "
422 "us more data than expected - "
423 "discarding data\n",
424 drive->name);
425
426 ide_pad_transfer(drive, 0, bcount);
427 goto next_irq;
428 }
429 debug_log("The device wants to send us more data than "
430 "expected - allowing transfer\n");
431 }
432 xferfunc = tp_ops->input_data;
433 } else
434 xferfunc = tp_ops->output_data;
435
436 if ((drive->media == ide_floppy && !pc->buf) ||
437 (drive->media == ide_tape && pc->bh)) {
438 int done = drive->pc_io_buffers(drive, pc, bcount,
439 !!(pc->flags & PC_FLAG_WRITING));
440
441 /* FIXME: don't do partial completions */
442 if (drive->media == ide_floppy)
443 ide_end_request(drive, 1, done >> 9);
444 } else
445 xferfunc(drive, NULL, pc->cur_pos, bcount);
446
447 /* Update the current position */
448 pc->xferred += bcount;
449 pc->cur_pos += bcount;
450
451 debug_log("[cmd %x] transferred %d bytes on that intr.\n",
452 rq->cmd[0], bcount);
453 next_irq:
454 /* And set the interrupt handler again */
455 ide_set_handler(drive, ide_pc_intr, timeout, NULL);
456 return ide_started;
457 }
458
ide_read_ireason(ide_drive_t * drive)459 static u8 ide_read_ireason(ide_drive_t *drive)
460 {
461 ide_task_t task;
462
463 memset(&task, 0, sizeof(task));
464 task.tf_flags = IDE_TFLAG_IN_NSECT;
465
466 drive->hwif->tp_ops->tf_read(drive, &task);
467
468 return task.tf.nsect & 3;
469 }
470
ide_wait_ireason(ide_drive_t * drive,u8 ireason)471 static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
472 {
473 int retries = 100;
474
475 while (retries-- && ((ireason & ATAPI_COD) == 0 ||
476 (ireason & ATAPI_IO))) {
477 printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
478 "a packet command, retrying\n", drive->name);
479 udelay(100);
480 ireason = ide_read_ireason(drive);
481 if (retries == 0) {
482 printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
483 "a packet command, ignoring\n",
484 drive->name);
485 ireason |= ATAPI_COD;
486 ireason &= ~ATAPI_IO;
487 }
488 }
489
490 return ireason;
491 }
492
ide_delayed_transfer_pc(ide_drive_t * drive)493 static int ide_delayed_transfer_pc(ide_drive_t *drive)
494 {
495 /* Send the actual packet */
496 drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12);
497
498 /* Timeout for the packet command */
499 return WAIT_FLOPPY_CMD;
500 }
501
ide_transfer_pc(ide_drive_t * drive)502 static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
503 {
504 struct ide_atapi_pc *uninitialized_var(pc);
505 ide_hwif_t *hwif = drive->hwif;
506 struct request *rq = hwif->rq;
507 ide_expiry_t *expiry;
508 unsigned int timeout;
509 int cmd_len;
510 ide_startstop_t startstop;
511 u8 ireason;
512
513 if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
514 printk(KERN_ERR "%s: Strange, packet command initiated yet "
515 "DRQ isn't asserted\n", drive->name);
516 return startstop;
517 }
518
519 if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
520 if (drive->dma)
521 drive->waiting_for_dma = 1;
522 }
523
524 if (dev_is_idecd(drive)) {
525 /* ATAPI commands get padded out to 12 bytes minimum */
526 cmd_len = COMMAND_SIZE(rq->cmd[0]);
527 if (cmd_len < ATAPI_MIN_CDB_BYTES)
528 cmd_len = ATAPI_MIN_CDB_BYTES;
529
530 timeout = rq->timeout;
531 expiry = ide_cd_expiry;
532 } else {
533 pc = drive->pc;
534
535 cmd_len = ATAPI_MIN_CDB_BYTES;
536
537 /*
538 * If necessary schedule the packet transfer to occur 'timeout'
539 * miliseconds later in ide_delayed_transfer_pc() after the
540 * device says it's ready for a packet.
541 */
542 if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) {
543 timeout = drive->pc_delay;
544 expiry = &ide_delayed_transfer_pc;
545 } else {
546 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
547 : WAIT_TAPE_CMD;
548 expiry = NULL;
549 }
550
551 ireason = ide_read_ireason(drive);
552 if (drive->media == ide_tape)
553 ireason = ide_wait_ireason(drive, ireason);
554
555 if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) {
556 printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
557 "a packet command\n", drive->name);
558
559 return ide_do_reset(drive);
560 }
561 }
562
563 /* Set the interrupt routine */
564 ide_set_handler(drive,
565 (dev_is_idecd(drive) ? drive->irq_handler
566 : ide_pc_intr),
567 timeout, expiry);
568
569 /* Begin DMA, if necessary */
570 if (dev_is_idecd(drive)) {
571 if (drive->dma)
572 hwif->dma_ops->dma_start(drive);
573 } else {
574 if (pc->flags & PC_FLAG_DMA_OK) {
575 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
576 hwif->dma_ops->dma_start(drive);
577 }
578 }
579
580 /* Send the actual packet */
581 if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
582 hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);
583
584 return ide_started;
585 }
586
ide_issue_pc(ide_drive_t * drive)587 ide_startstop_t ide_issue_pc(ide_drive_t *drive)
588 {
589 struct ide_atapi_pc *pc;
590 ide_hwif_t *hwif = drive->hwif;
591 ide_expiry_t *expiry = NULL;
592 unsigned int timeout;
593 u32 tf_flags;
594 u16 bcount;
595
596 if (dev_is_idecd(drive)) {
597 tf_flags = IDE_TFLAG_OUT_NSECT | IDE_TFLAG_OUT_LBAL;
598 bcount = ide_cd_get_xferlen(hwif->rq);
599 expiry = ide_cd_expiry;
600 timeout = ATAPI_WAIT_PC;
601
602 if (drive->dma)
603 drive->dma = !hwif->dma_ops->dma_setup(drive);
604 } else {
605 pc = drive->pc;
606
607 /* We haven't transferred any data yet */
608 pc->xferred = 0;
609 pc->cur_pos = pc->buf;
610
611 tf_flags = IDE_TFLAG_OUT_DEVICE;
612 bcount = ((drive->media == ide_tape) ?
613 pc->req_xfer :
614 min(pc->req_xfer, 63 * 1024));
615
616 if (pc->flags & PC_FLAG_DMA_ERROR) {
617 pc->flags &= ~PC_FLAG_DMA_ERROR;
618 ide_dma_off(drive);
619 }
620
621 if ((pc->flags & PC_FLAG_DMA_OK) &&
622 (drive->dev_flags & IDE_DFLAG_USING_DMA))
623 drive->dma = !hwif->dma_ops->dma_setup(drive);
624
625 if (!drive->dma)
626 pc->flags &= ~PC_FLAG_DMA_OK;
627
628 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
629 : WAIT_TAPE_CMD;
630 }
631
632 ide_pktcmd_tf_load(drive, tf_flags, bcount, drive->dma);
633
634 /* Issue the packet command */
635 if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
636 if (drive->dma)
637 drive->waiting_for_dma = 0;
638 ide_execute_command(drive, ATA_CMD_PACKET, ide_transfer_pc,
639 timeout, expiry);
640 return ide_started;
641 } else {
642 ide_execute_pkt_cmd(drive);
643 return ide_transfer_pc(drive);
644 }
645 }
646 EXPORT_SYMBOL_GPL(ide_issue_pc);
647