5 #include <linux/kernel.h>
6 #include <linux/cdrom.h>
7 #include <linux/delay.h>
9 #include <linux/scatterlist.h>
11 #include <scsi/scsi.h>
14 #define debug_log(fmt, args...) \
15 printk(KERN_INFO "ide: " fmt, ## args)
17 #define debug_log(fmt, args...) do {} while (0)
20 #define ATAPI_MIN_CDB_BYTES 12
22 static inline int dev_is_idecd(ide_drive_t
*drive
)
24 return drive
->media
== ide_cdrom
|| drive
->media
== ide_optical
;
28 * Check whether we can support a device,
29 * based on the ATAPI IDENTIFY command results.
31 int ide_check_atapi_device(ide_drive_t
*drive
, const char *s
)
34 u8 gcw
[2], protocol
, device_type
, removable
, drq_type
, packet_size
;
36 *((u16
*)&gcw
) = id
[ATA_ID_CONFIG
];
38 protocol
= (gcw
[1] & 0xC0) >> 6;
39 device_type
= gcw
[1] & 0x1F;
40 removable
= (gcw
[0] & 0x80) >> 7;
41 drq_type
= (gcw
[0] & 0x60) >> 5;
42 packet_size
= gcw
[0] & 0x03;
45 /* kludge for Apple PowerBook internal zip */
46 if (drive
->media
== ide_floppy
&& device_type
== 5 &&
47 !strstr((char *)&id
[ATA_ID_PROD
], "CD-ROM") &&
48 strstr((char *)&id
[ATA_ID_PROD
], "ZIP"))
53 printk(KERN_ERR
"%s: %s: protocol (0x%02x) is not ATAPI\n",
54 s
, drive
->name
, protocol
);
55 else if ((drive
->media
== ide_floppy
&& device_type
!= 0) ||
56 (drive
->media
== ide_tape
&& device_type
!= 1))
57 printk(KERN_ERR
"%s: %s: invalid device type (0x%02x)\n",
58 s
, drive
->name
, device_type
);
59 else if (removable
== 0)
60 printk(KERN_ERR
"%s: %s: the removable flag is not set\n",
62 else if (drive
->media
== ide_floppy
&& drq_type
== 3)
63 printk(KERN_ERR
"%s: %s: sorry, DRQ type (0x%02x) not "
64 "supported\n", s
, drive
->name
, drq_type
);
65 else if (packet_size
!= 0)
66 printk(KERN_ERR
"%s: %s: packet size (0x%02x) is not 12 "
67 "bytes\n", s
, drive
->name
, packet_size
);
72 EXPORT_SYMBOL_GPL(ide_check_atapi_device
);
74 void ide_init_pc(struct ide_atapi_pc
*pc
)
76 memset(pc
, 0, sizeof(*pc
));
78 pc
->buf_size
= IDE_PC_BUFFER_SIZE
;
80 EXPORT_SYMBOL_GPL(ide_init_pc
);
83 * Generate a new packet command request in front of the request queue, before
84 * the current request, so that it will be processed immediately, on the next
85 * pass through the driver.
87 static void ide_queue_pc_head(ide_drive_t
*drive
, struct gendisk
*disk
,
88 struct ide_atapi_pc
*pc
, struct request
*rq
)
90 blk_rq_init(NULL
, rq
);
91 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
92 rq
->cmd_flags
|= REQ_PREEMPT
;
93 rq
->buffer
= (char *)pc
;
98 rq
->data_len
= pc
->req_xfer
;
101 memcpy(rq
->cmd
, pc
->c
, 12);
102 if (drive
->media
== ide_tape
)
103 rq
->cmd
[13] = REQ_IDETAPE_PC1
;
105 drive
->hwif
->rq
= NULL
;
107 elv_add_request(drive
->queue
, rq
, ELEVATOR_INSERT_FRONT
, 0);
111 * Add a special packet command request to the tail of the request queue,
112 * and wait for it to be serviced.
114 int ide_queue_pc_tail(ide_drive_t
*drive
, struct gendisk
*disk
,
115 struct ide_atapi_pc
*pc
)
120 rq
= blk_get_request(drive
->queue
, READ
, __GFP_WAIT
);
121 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
122 rq
->buffer
= (char *)pc
;
126 rq
->data_len
= pc
->req_xfer
;
129 memcpy(rq
->cmd
, pc
->c
, 12);
130 if (drive
->media
== ide_tape
)
131 rq
->cmd
[13] = REQ_IDETAPE_PC1
;
132 error
= blk_execute_rq(drive
->queue
, disk
, rq
, 0);
137 EXPORT_SYMBOL_GPL(ide_queue_pc_tail
);
139 int ide_do_test_unit_ready(ide_drive_t
*drive
, struct gendisk
*disk
)
141 struct ide_atapi_pc pc
;
144 pc
.c
[0] = TEST_UNIT_READY
;
146 return ide_queue_pc_tail(drive
, disk
, &pc
);
148 EXPORT_SYMBOL_GPL(ide_do_test_unit_ready
);
150 int ide_do_start_stop(ide_drive_t
*drive
, struct gendisk
*disk
, int start
)
152 struct ide_atapi_pc pc
;
155 pc
.c
[0] = START_STOP
;
158 if (drive
->media
== ide_tape
)
159 pc
.flags
|= PC_FLAG_WAIT_FOR_DSC
;
161 return ide_queue_pc_tail(drive
, disk
, &pc
);
163 EXPORT_SYMBOL_GPL(ide_do_start_stop
);
165 int ide_set_media_lock(ide_drive_t
*drive
, struct gendisk
*disk
, int on
)
167 struct ide_atapi_pc pc
;
169 if ((drive
->dev_flags
& IDE_DFLAG_DOORLOCKING
) == 0)
173 pc
.c
[0] = ALLOW_MEDIUM_REMOVAL
;
176 return ide_queue_pc_tail(drive
, disk
, &pc
);
178 EXPORT_SYMBOL_GPL(ide_set_media_lock
);
180 void ide_create_request_sense_cmd(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
)
183 pc
->c
[0] = REQUEST_SENSE
;
184 if (drive
->media
== ide_floppy
) {
192 EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd
);
195 * Called when an error was detected during the last packet command.
196 * We queue a request sense packet command in the head of the request list.
198 void ide_retry_pc(ide_drive_t
*drive
, struct gendisk
*disk
)
200 struct request
*rq
= &drive
->request_sense_rq
;
201 struct ide_atapi_pc
*pc
= &drive
->request_sense_pc
;
203 (void)ide_read_error(drive
);
204 ide_create_request_sense_cmd(drive
, pc
);
205 if (drive
->media
== ide_tape
)
206 set_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
);
207 ide_queue_pc_head(drive
, disk
, pc
, rq
);
209 EXPORT_SYMBOL_GPL(ide_retry_pc
);
211 int ide_cd_expiry(ide_drive_t
*drive
)
213 struct request
*rq
= drive
->hwif
->rq
;
214 unsigned long wait
= 0;
216 debug_log("%s: rq->cmd[0]: 0x%x\n", __func__
, rq
->cmd
[0]);
219 * Some commands are *slow* and normally take a long time to complete.
220 * Usually we can use the ATAPI "disconnect" to bypass this, but not all
221 * commands/drives support that. Let ide_timer_expiry keep polling us
224 switch (rq
->cmd
[0]) {
226 case GPCMD_FORMAT_UNIT
:
227 case GPCMD_RESERVE_RZONE_TRACK
:
228 case GPCMD_CLOSE_TRACK
:
229 case GPCMD_FLUSH_CACHE
:
230 wait
= ATAPI_WAIT_PC
;
233 if (!(rq
->cmd_flags
& REQ_QUIET
))
234 printk(KERN_INFO
"cmd 0x%x timed out\n",
241 EXPORT_SYMBOL_GPL(ide_cd_expiry
);
243 int ide_cd_get_xferlen(struct request
*rq
)
245 if (blk_fs_request(rq
))
247 else if (blk_sense_request(rq
) || blk_pc_request(rq
) ||
248 rq
->cmd_type
== REQ_TYPE_ATA_PC
)
253 EXPORT_SYMBOL_GPL(ide_cd_get_xferlen
);
255 void ide_read_bcount_and_ireason(ide_drive_t
*drive
, u16
*bcount
, u8
*ireason
)
259 memset(&cmd
, 0, sizeof(cmd
));
260 cmd
.tf_flags
= IDE_TFLAG_IN_LBAH
| IDE_TFLAG_IN_LBAM
|
263 drive
->hwif
->tp_ops
->tf_read(drive
, &cmd
);
265 *bcount
= (cmd
.tf
.lbah
<< 8) | cmd
.tf
.lbam
;
266 *ireason
= cmd
.tf
.nsect
& 3;
268 EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason
);
271 * This is the usual interrupt handler which will be called during a packet
272 * command. We will transfer some of the data (as requested by the drive)
273 * and will re-point interrupt handler to us.
275 static ide_startstop_t
ide_pc_intr(ide_drive_t
*drive
)
277 struct ide_atapi_pc
*pc
= drive
->pc
;
278 ide_hwif_t
*hwif
= drive
->hwif
;
279 struct ide_cmd
*cmd
= &hwif
->cmd
;
280 struct request
*rq
= hwif
->rq
;
281 const struct ide_tp_ops
*tp_ops
= hwif
->tp_ops
;
282 xfer_func_t
*xferfunc
;
283 unsigned int timeout
, done
;
285 u8 stat
, ireason
, dsc
= 0;
286 u8 write
= !!(pc
->flags
& PC_FLAG_WRITING
);
288 debug_log("Enter %s - interrupt handler\n", __func__
);
290 timeout
= (drive
->media
== ide_floppy
) ? WAIT_FLOPPY_CMD
293 /* Clear the interrupt */
294 stat
= tp_ops
->read_status(hwif
);
296 if (pc
->flags
& PC_FLAG_DMA_IN_PROGRESS
) {
299 drive
->waiting_for_dma
= 0;
300 rc
= hwif
->dma_ops
->dma_end(drive
);
301 ide_dma_unmap_sg(drive
, cmd
);
303 if (rc
|| (drive
->media
== ide_tape
&& (stat
& ATA_ERR
))) {
304 if (drive
->media
== ide_floppy
)
305 printk(KERN_ERR
"%s: DMA %s error\n",
306 drive
->name
, rq_data_dir(pc
->rq
)
308 pc
->flags
|= PC_FLAG_DMA_ERROR
;
310 pc
->xferred
= pc
->req_xfer
;
311 if (drive
->pc_update_buffers
)
312 drive
->pc_update_buffers(drive
, pc
);
314 debug_log("%s: DMA finished\n", drive
->name
);
317 /* No more interrupts */
318 if ((stat
& ATA_DRQ
) == 0) {
322 debug_log("Packet command completed, %d bytes transferred\n",
325 pc
->flags
&= ~PC_FLAG_DMA_IN_PROGRESS
;
327 local_irq_enable_in_hardirq();
329 if (drive
->media
== ide_tape
&&
330 (stat
& ATA_ERR
) && rq
->cmd
[0] == REQUEST_SENSE
)
333 if ((stat
& ATA_ERR
) || (pc
->flags
& PC_FLAG_DMA_ERROR
)) {
335 debug_log("%s: I/O error\n", drive
->name
);
337 if (drive
->media
!= ide_tape
)
340 if (rq
->cmd
[0] == REQUEST_SENSE
) {
341 printk(KERN_ERR
"%s: I/O error in request sense"
342 " command\n", drive
->name
);
343 return ide_do_reset(drive
);
346 debug_log("[cmd %x]: check condition\n", rq
->cmd
[0]);
348 /* Retry operation */
349 ide_retry_pc(drive
, rq
->rq_disk
);
351 /* queued, but not started */
356 if ((pc
->flags
& PC_FLAG_WAIT_FOR_DSC
) && (stat
& ATA_DSC
) == 0)
359 /* Command finished - Call the callback function */
360 uptodate
= drive
->pc_callback(drive
, dsc
);
363 drive
->failed_pc
= NULL
;
365 if (blk_special_request(rq
)) {
367 done
= blk_rq_bytes(rq
);
371 if (blk_fs_request(rq
) == 0 && uptodate
<= 0) {
376 if (drive
->media
== ide_tape
)
377 done
= ide_rq_bytes(rq
); /* FIXME */
379 done
= blk_rq_bytes(rq
);
381 error
= uptodate
? 0 : -EIO
;
384 ide_complete_rq(drive
, error
, done
);
388 if (pc
->flags
& PC_FLAG_DMA_IN_PROGRESS
) {
389 pc
->flags
&= ~PC_FLAG_DMA_IN_PROGRESS
;
390 printk(KERN_ERR
"%s: The device wants to issue more interrupts "
391 "in DMA mode\n", drive
->name
);
393 return ide_do_reset(drive
);
396 /* Get the number of bytes to transfer on this interrupt. */
397 ide_read_bcount_and_ireason(drive
, &bcount
, &ireason
);
399 if (ireason
& ATAPI_COD
) {
400 printk(KERN_ERR
"%s: CoD != 0 in %s\n", drive
->name
, __func__
);
401 return ide_do_reset(drive
);
404 if (((ireason
& ATAPI_IO
) == ATAPI_IO
) == write
) {
405 /* Hopefully, we will never get here */
406 printk(KERN_ERR
"%s: We wanted to %s, but the device wants us "
407 "to %s!\n", drive
->name
,
408 (ireason
& ATAPI_IO
) ? "Write" : "Read",
409 (ireason
& ATAPI_IO
) ? "Read" : "Write");
410 return ide_do_reset(drive
);
413 xferfunc
= write
? tp_ops
->output_data
: tp_ops
->input_data
;
415 if (drive
->media
== ide_floppy
&& pc
->buf
== NULL
) {
416 done
= min_t(unsigned int, bcount
, cmd
->nleft
);
417 ide_pio_bytes(drive
, cmd
, write
, done
);
418 } else if (drive
->media
== ide_tape
&& pc
->bh
) {
419 done
= drive
->pc_io_buffers(drive
, pc
, bcount
, write
);
421 done
= min_t(unsigned int, bcount
, pc
->req_xfer
- pc
->xferred
);
422 xferfunc(drive
, NULL
, pc
->cur_pos
, done
);
425 /* Update the current position */
432 ide_pad_transfer(drive
, write
, bcount
);
434 debug_log("[cmd %x] transferred %d bytes, padded %d bytes\n",
435 rq
->cmd
[0], done
, bcount
);
437 /* And set the interrupt handler again */
438 ide_set_handler(drive
, ide_pc_intr
, timeout
);
442 static void ide_init_packet_cmd(struct ide_cmd
*cmd
, u32 tf_flags
,
445 cmd
->protocol
= dma
? ATAPI_PROT_DMA
: ATAPI_PROT_PIO
;
446 cmd
->tf_flags
|= IDE_TFLAG_OUT_LBAH
| IDE_TFLAG_OUT_LBAM
|
447 IDE_TFLAG_OUT_FEATURE
| tf_flags
;
448 cmd
->tf
.command
= ATA_CMD_PACKET
;
449 cmd
->tf
.feature
= dma
; /* Use PIO/DMA */
450 cmd
->tf
.lbam
= bcount
& 0xff;
451 cmd
->tf
.lbah
= (bcount
>> 8) & 0xff;
454 static u8
ide_read_ireason(ide_drive_t
*drive
)
458 memset(&cmd
, 0, sizeof(cmd
));
459 cmd
.tf_flags
= IDE_TFLAG_IN_NSECT
;
461 drive
->hwif
->tp_ops
->tf_read(drive
, &cmd
);
463 return cmd
.tf
.nsect
& 3;
466 static u8
ide_wait_ireason(ide_drive_t
*drive
, u8 ireason
)
470 while (retries
-- && ((ireason
& ATAPI_COD
) == 0 ||
471 (ireason
& ATAPI_IO
))) {
472 printk(KERN_ERR
"%s: (IO,CoD != (0,1) while issuing "
473 "a packet command, retrying\n", drive
->name
);
475 ireason
= ide_read_ireason(drive
);
477 printk(KERN_ERR
"%s: (IO,CoD != (0,1) while issuing "
478 "a packet command, ignoring\n",
480 ireason
|= ATAPI_COD
;
481 ireason
&= ~ATAPI_IO
;
488 static int ide_delayed_transfer_pc(ide_drive_t
*drive
)
490 /* Send the actual packet */
491 drive
->hwif
->tp_ops
->output_data(drive
, NULL
, drive
->pc
->c
, 12);
493 /* Timeout for the packet command */
494 return WAIT_FLOPPY_CMD
;
497 static ide_startstop_t
ide_transfer_pc(ide_drive_t
*drive
)
499 struct ide_atapi_pc
*uninitialized_var(pc
);
500 ide_hwif_t
*hwif
= drive
->hwif
;
501 struct request
*rq
= hwif
->rq
;
502 ide_expiry_t
*expiry
;
503 unsigned int timeout
;
505 ide_startstop_t startstop
;
508 if (ide_wait_stat(&startstop
, drive
, ATA_DRQ
, ATA_BUSY
, WAIT_READY
)) {
509 printk(KERN_ERR
"%s: Strange, packet command initiated yet "
510 "DRQ isn't asserted\n", drive
->name
);
514 if (drive
->atapi_flags
& IDE_AFLAG_DRQ_INTERRUPT
) {
516 drive
->waiting_for_dma
= 1;
519 if (dev_is_idecd(drive
)) {
520 /* ATAPI commands get padded out to 12 bytes minimum */
521 cmd_len
= COMMAND_SIZE(rq
->cmd
[0]);
522 if (cmd_len
< ATAPI_MIN_CDB_BYTES
)
523 cmd_len
= ATAPI_MIN_CDB_BYTES
;
525 timeout
= rq
->timeout
;
526 expiry
= ide_cd_expiry
;
530 cmd_len
= ATAPI_MIN_CDB_BYTES
;
533 * If necessary schedule the packet transfer to occur 'timeout'
534 * miliseconds later in ide_delayed_transfer_pc() after the
535 * device says it's ready for a packet.
537 if (drive
->atapi_flags
& IDE_AFLAG_ZIP_DRIVE
) {
538 timeout
= drive
->pc_delay
;
539 expiry
= &ide_delayed_transfer_pc
;
541 timeout
= (drive
->media
== ide_floppy
) ? WAIT_FLOPPY_CMD
546 ireason
= ide_read_ireason(drive
);
547 if (drive
->media
== ide_tape
)
548 ireason
= ide_wait_ireason(drive
, ireason
);
550 if ((ireason
& ATAPI_COD
) == 0 || (ireason
& ATAPI_IO
)) {
551 printk(KERN_ERR
"%s: (IO,CoD) != (0,1) while issuing "
552 "a packet command\n", drive
->name
);
554 return ide_do_reset(drive
);
558 hwif
->expiry
= expiry
;
560 /* Set the interrupt routine */
561 ide_set_handler(drive
,
562 (dev_is_idecd(drive
) ? drive
->irq_handler
566 /* Send the actual packet */
567 if ((drive
->atapi_flags
& IDE_AFLAG_ZIP_DRIVE
) == 0)
568 hwif
->tp_ops
->output_data(drive
, NULL
, rq
->cmd
, cmd_len
);
570 /* Begin DMA, if necessary */
571 if (dev_is_idecd(drive
)) {
573 hwif
->dma_ops
->dma_start(drive
);
575 if (pc
->flags
& PC_FLAG_DMA_OK
) {
576 pc
->flags
|= PC_FLAG_DMA_IN_PROGRESS
;
577 hwif
->dma_ops
->dma_start(drive
);
584 ide_startstop_t
ide_issue_pc(ide_drive_t
*drive
, struct ide_cmd
*cmd
)
586 struct ide_atapi_pc
*pc
;
587 ide_hwif_t
*hwif
= drive
->hwif
;
588 ide_expiry_t
*expiry
= NULL
;
589 struct request
*rq
= hwif
->rq
;
590 unsigned int timeout
;
593 u8 drq_int
= !!(drive
->atapi_flags
& IDE_AFLAG_DRQ_INTERRUPT
);
595 if (dev_is_idecd(drive
)) {
596 tf_flags
= IDE_TFLAG_OUT_NSECT
| IDE_TFLAG_OUT_LBAL
;
597 bcount
= ide_cd_get_xferlen(rq
);
598 expiry
= ide_cd_expiry
;
599 timeout
= ATAPI_WAIT_PC
;
602 drive
->dma
= !ide_dma_prepare(drive
, cmd
);
606 /* We haven't transferred any data yet */
608 pc
->cur_pos
= pc
->buf
;
610 tf_flags
= IDE_TFLAG_OUT_DEVICE
;
611 bcount
= ((drive
->media
== ide_tape
) ?
613 min(pc
->req_xfer
, 63 * 1024));
615 if (pc
->flags
& PC_FLAG_DMA_ERROR
) {
616 pc
->flags
&= ~PC_FLAG_DMA_ERROR
;
620 if (pc
->flags
& PC_FLAG_DMA_OK
)
621 drive
->dma
= !ide_dma_prepare(drive
, cmd
);
624 pc
->flags
&= ~PC_FLAG_DMA_OK
;
626 timeout
= (drive
->media
== ide_floppy
) ? WAIT_FLOPPY_CMD
630 ide_init_packet_cmd(cmd
, tf_flags
, bcount
, drive
->dma
);
632 (void)do_rw_taskfile(drive
, cmd
);
636 drive
->waiting_for_dma
= 0;
637 hwif
->expiry
= expiry
;
640 ide_execute_command(drive
, cmd
, ide_transfer_pc
, timeout
);
642 return drq_int
? ide_started
: ide_transfer_pc(drive
);
644 EXPORT_SYMBOL_GPL(ide_issue_pc
);