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 /* PIO data transfer routine using the scatter gather table. */
75 int ide_io_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
76 unsigned int bcount
, int write
)
78 ide_hwif_t
*hwif
= drive
->hwif
;
79 const struct ide_tp_ops
*tp_ops
= hwif
->tp_ops
;
80 xfer_func_t
*xf
= write
? tp_ops
->output_data
: tp_ops
->input_data
;
81 struct scatterlist
*sg
= pc
->sg
;
86 count
= min(sg
->length
- pc
->b_count
, bcount
);
88 if (PageHighMem(sg_page(sg
))) {
91 local_irq_save(flags
);
92 buf
= kmap_atomic(sg_page(sg
), KM_IRQ0
) + sg
->offset
;
93 xf(drive
, NULL
, buf
+ pc
->b_count
, count
);
94 kunmap_atomic(buf
- sg
->offset
, KM_IRQ0
);
95 local_irq_restore(flags
);
98 xf(drive
, NULL
, buf
+ pc
->b_count
, count
);
102 pc
->b_count
+= count
;
105 if (pc
->b_count
== sg
->length
) {
108 pc
->sg
= sg
= sg_next(sg
);
114 printk(KERN_ERR
"%s: %d leftover bytes, %s\n", drive
->name
,
115 bcount
, write
? "padding with zeros"
116 : "discarding data");
117 ide_pad_transfer(drive
, write
, bcount
);
122 EXPORT_SYMBOL_GPL(ide_io_buffers
);
124 void ide_init_pc(struct ide_atapi_pc
*pc
)
126 memset(pc
, 0, sizeof(*pc
));
127 pc
->buf
= pc
->pc_buf
;
128 pc
->buf_size
= IDE_PC_BUFFER_SIZE
;
130 EXPORT_SYMBOL_GPL(ide_init_pc
);
133 * Generate a new packet command request in front of the request queue, before
134 * the current request, so that it will be processed immediately, on the next
135 * pass through the driver.
137 static void ide_queue_pc_head(ide_drive_t
*drive
, struct gendisk
*disk
,
138 struct ide_atapi_pc
*pc
, struct request
*rq
)
140 blk_rq_init(NULL
, rq
);
141 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
142 rq
->cmd_flags
|= REQ_PREEMPT
;
143 rq
->buffer
= (char *)pc
;
148 rq
->data_len
= pc
->req_xfer
;
151 memcpy(rq
->cmd
, pc
->c
, 12);
152 if (drive
->media
== ide_tape
)
153 rq
->cmd
[13] = REQ_IDETAPE_PC1
;
154 ide_do_drive_cmd(drive
, rq
);
158 * Add a special packet command request to the tail of the request queue,
159 * and wait for it to be serviced.
161 int ide_queue_pc_tail(ide_drive_t
*drive
, struct gendisk
*disk
,
162 struct ide_atapi_pc
*pc
)
167 rq
= blk_get_request(drive
->queue
, READ
, __GFP_WAIT
);
168 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
169 rq
->buffer
= (char *)pc
;
173 rq
->data_len
= pc
->req_xfer
;
176 memcpy(rq
->cmd
, pc
->c
, 12);
177 if (drive
->media
== ide_tape
)
178 rq
->cmd
[13] = REQ_IDETAPE_PC1
;
179 error
= blk_execute_rq(drive
->queue
, disk
, rq
, 0);
184 EXPORT_SYMBOL_GPL(ide_queue_pc_tail
);
186 int ide_do_test_unit_ready(ide_drive_t
*drive
, struct gendisk
*disk
)
188 struct ide_atapi_pc pc
;
191 pc
.c
[0] = TEST_UNIT_READY
;
193 return ide_queue_pc_tail(drive
, disk
, &pc
);
195 EXPORT_SYMBOL_GPL(ide_do_test_unit_ready
);
197 int ide_do_start_stop(ide_drive_t
*drive
, struct gendisk
*disk
, int start
)
199 struct ide_atapi_pc pc
;
202 pc
.c
[0] = START_STOP
;
205 if (drive
->media
== ide_tape
)
206 pc
.flags
|= PC_FLAG_WAIT_FOR_DSC
;
208 return ide_queue_pc_tail(drive
, disk
, &pc
);
210 EXPORT_SYMBOL_GPL(ide_do_start_stop
);
212 int ide_set_media_lock(ide_drive_t
*drive
, struct gendisk
*disk
, int on
)
214 struct ide_atapi_pc pc
;
216 if ((drive
->dev_flags
& IDE_DFLAG_DOORLOCKING
) == 0)
220 pc
.c
[0] = ALLOW_MEDIUM_REMOVAL
;
223 return ide_queue_pc_tail(drive
, disk
, &pc
);
225 EXPORT_SYMBOL_GPL(ide_set_media_lock
);
227 void ide_create_request_sense_cmd(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
)
230 pc
->c
[0] = REQUEST_SENSE
;
231 if (drive
->media
== ide_floppy
) {
239 EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd
);
242 * Called when an error was detected during the last packet command.
243 * We queue a request sense packet command in the head of the request list.
245 void ide_retry_pc(ide_drive_t
*drive
, struct gendisk
*disk
)
247 struct request
*rq
= &drive
->request_sense_rq
;
248 struct ide_atapi_pc
*pc
= &drive
->request_sense_pc
;
250 (void)ide_read_error(drive
);
251 ide_create_request_sense_cmd(drive
, pc
);
252 if (drive
->media
== ide_tape
)
253 set_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
);
254 ide_queue_pc_head(drive
, disk
, pc
, rq
);
256 EXPORT_SYMBOL_GPL(ide_retry_pc
);
258 int ide_cd_expiry(ide_drive_t
*drive
)
260 struct request
*rq
= drive
->hwif
->rq
;
261 unsigned long wait
= 0;
263 debug_log("%s: rq->cmd[0]: 0x%x\n", __func__
, rq
->cmd
[0]);
266 * Some commands are *slow* and normally take a long time to complete.
267 * Usually we can use the ATAPI "disconnect" to bypass this, but not all
268 * commands/drives support that. Let ide_timer_expiry keep polling us
271 switch (rq
->cmd
[0]) {
273 case GPCMD_FORMAT_UNIT
:
274 case GPCMD_RESERVE_RZONE_TRACK
:
275 case GPCMD_CLOSE_TRACK
:
276 case GPCMD_FLUSH_CACHE
:
277 wait
= ATAPI_WAIT_PC
;
280 if (!(rq
->cmd_flags
& REQ_QUIET
))
281 printk(KERN_INFO
"cmd 0x%x timed out\n",
288 EXPORT_SYMBOL_GPL(ide_cd_expiry
);
290 int ide_cd_get_xferlen(struct request
*rq
)
292 if (blk_fs_request(rq
))
294 else if (blk_sense_request(rq
) || blk_pc_request(rq
) ||
295 rq
->cmd_type
== REQ_TYPE_ATA_PC
)
300 EXPORT_SYMBOL_GPL(ide_cd_get_xferlen
);
303 * This is the usual interrupt handler which will be called during a packet
304 * command. We will transfer some of the data (as requested by the drive)
305 * and will re-point interrupt handler to us.
307 static ide_startstop_t
ide_pc_intr(ide_drive_t
*drive
)
309 struct ide_atapi_pc
*pc
= drive
->pc
;
310 ide_hwif_t
*hwif
= drive
->hwif
;
311 struct request
*rq
= hwif
->rq
;
312 const struct ide_tp_ops
*tp_ops
= hwif
->tp_ops
;
313 xfer_func_t
*xferfunc
;
314 unsigned int timeout
, temp
;
316 u8 stat
, ireason
, dsc
= 0;
318 debug_log("Enter %s - interrupt handler\n", __func__
);
320 timeout
= (drive
->media
== ide_floppy
) ? WAIT_FLOPPY_CMD
323 if (pc
->flags
& PC_FLAG_TIMEDOUT
) {
324 drive
->pc_callback(drive
, 0);
328 /* Clear the interrupt */
329 stat
= tp_ops
->read_status(hwif
);
331 if (pc
->flags
& PC_FLAG_DMA_IN_PROGRESS
) {
332 if (hwif
->dma_ops
->dma_end(drive
) ||
333 (drive
->media
== ide_tape
&& (stat
& ATA_ERR
))) {
334 if (drive
->media
== ide_floppy
)
335 printk(KERN_ERR
"%s: DMA %s error\n",
336 drive
->name
, rq_data_dir(pc
->rq
)
338 pc
->flags
|= PC_FLAG_DMA_ERROR
;
340 pc
->xferred
= pc
->req_xfer
;
341 if (drive
->pc_update_buffers
)
342 drive
->pc_update_buffers(drive
, pc
);
344 debug_log("%s: DMA finished\n", drive
->name
);
347 /* No more interrupts */
348 if ((stat
& ATA_DRQ
) == 0) {
349 debug_log("Packet command completed, %d bytes transferred\n",
352 pc
->flags
&= ~PC_FLAG_DMA_IN_PROGRESS
;
354 local_irq_enable_in_hardirq();
356 if (drive
->media
== ide_tape
&&
357 (stat
& ATA_ERR
) && rq
->cmd
[0] == REQUEST_SENSE
)
360 if ((stat
& ATA_ERR
) || (pc
->flags
& PC_FLAG_DMA_ERROR
)) {
362 debug_log("%s: I/O error\n", drive
->name
);
364 if (drive
->media
!= ide_tape
)
367 if (rq
->cmd
[0] == REQUEST_SENSE
) {
368 printk(KERN_ERR
"%s: I/O error in request sense"
369 " command\n", drive
->name
);
370 return ide_do_reset(drive
);
373 debug_log("[cmd %x]: check condition\n", rq
->cmd
[0]);
375 /* Retry operation */
376 ide_retry_pc(drive
, rq
->rq_disk
);
378 /* queued, but not started */
383 if ((pc
->flags
& PC_FLAG_WAIT_FOR_DSC
) && (stat
& ATA_DSC
) == 0)
386 /* Command finished - Call the callback function */
387 drive
->pc_callback(drive
, dsc
);
392 if (pc
->flags
& PC_FLAG_DMA_IN_PROGRESS
) {
393 pc
->flags
&= ~PC_FLAG_DMA_IN_PROGRESS
;
394 printk(KERN_ERR
"%s: The device wants to issue more interrupts "
395 "in DMA mode\n", drive
->name
);
397 return ide_do_reset(drive
);
400 /* Get the number of bytes to transfer on this interrupt. */
401 ide_read_bcount_and_ireason(drive
, &bcount
, &ireason
);
403 if (ireason
& ATAPI_COD
) {
404 printk(KERN_ERR
"%s: CoD != 0 in %s\n", drive
->name
, __func__
);
405 return ide_do_reset(drive
);
408 if (((ireason
& ATAPI_IO
) == ATAPI_IO
) ==
409 !!(pc
->flags
& PC_FLAG_WRITING
)) {
410 /* Hopefully, we will never get here */
411 printk(KERN_ERR
"%s: We wanted to %s, but the device wants us "
412 "to %s!\n", drive
->name
,
413 (ireason
& ATAPI_IO
) ? "Write" : "Read",
414 (ireason
& ATAPI_IO
) ? "Read" : "Write");
415 return ide_do_reset(drive
);
418 if (!(pc
->flags
& PC_FLAG_WRITING
)) {
419 /* Reading - Check that we have enough space */
420 temp
= pc
->xferred
+ bcount
;
421 if (temp
> pc
->req_xfer
) {
422 if (temp
> pc
->buf_size
) {
423 printk(KERN_ERR
"%s: The device wants to send "
424 "us more data than expected - "
428 ide_pad_transfer(drive
, 0, bcount
);
431 debug_log("The device wants to send us more data than "
432 "expected - allowing transfer\n");
434 xferfunc
= tp_ops
->input_data
;
436 xferfunc
= tp_ops
->output_data
;
438 if ((drive
->media
== ide_floppy
&& !pc
->buf
) ||
439 (drive
->media
== ide_tape
&& pc
->bh
)) {
440 int done
= drive
->pc_io_buffers(drive
, pc
, bcount
,
441 !!(pc
->flags
& PC_FLAG_WRITING
));
443 /* FIXME: don't do partial completions */
444 if (drive
->media
== ide_floppy
)
445 ide_end_request(drive
, 1, done
>> 9);
447 xferfunc(drive
, NULL
, pc
->cur_pos
, bcount
);
449 /* Update the current position */
450 pc
->xferred
+= bcount
;
451 pc
->cur_pos
+= bcount
;
453 debug_log("[cmd %x] transferred %d bytes on that intr.\n",
456 /* And set the interrupt handler again */
457 ide_set_handler(drive
, ide_pc_intr
, timeout
, NULL
);
461 static u8
ide_read_ireason(ide_drive_t
*drive
)
465 memset(&task
, 0, sizeof(task
));
466 task
.tf_flags
= IDE_TFLAG_IN_NSECT
;
468 drive
->hwif
->tp_ops
->tf_read(drive
, &task
);
470 return task
.tf
.nsect
& 3;
473 static u8
ide_wait_ireason(ide_drive_t
*drive
, u8 ireason
)
477 while (retries
-- && ((ireason
& ATAPI_COD
) == 0 ||
478 (ireason
& ATAPI_IO
))) {
479 printk(KERN_ERR
"%s: (IO,CoD != (0,1) while issuing "
480 "a packet command, retrying\n", drive
->name
);
482 ireason
= ide_read_ireason(drive
);
484 printk(KERN_ERR
"%s: (IO,CoD != (0,1) while issuing "
485 "a packet command, ignoring\n",
487 ireason
|= ATAPI_COD
;
488 ireason
&= ~ATAPI_IO
;
495 static int ide_delayed_transfer_pc(ide_drive_t
*drive
)
497 /* Send the actual packet */
498 drive
->hwif
->tp_ops
->output_data(drive
, NULL
, drive
->pc
->c
, 12);
500 /* Timeout for the packet command */
501 return WAIT_FLOPPY_CMD
;
504 static ide_startstop_t
ide_transfer_pc(ide_drive_t
*drive
)
506 struct ide_atapi_pc
*uninitialized_var(pc
);
507 ide_hwif_t
*hwif
= drive
->hwif
;
508 struct request
*rq
= hwif
->rq
;
509 ide_expiry_t
*expiry
;
510 unsigned int timeout
;
512 ide_startstop_t startstop
;
515 if (ide_wait_stat(&startstop
, drive
, ATA_DRQ
, ATA_BUSY
, WAIT_READY
)) {
516 printk(KERN_ERR
"%s: Strange, packet command initiated yet "
517 "DRQ isn't asserted\n", drive
->name
);
521 if (drive
->atapi_flags
& IDE_AFLAG_DRQ_INTERRUPT
) {
523 drive
->waiting_for_dma
= 1;
526 if (dev_is_idecd(drive
)) {
527 /* ATAPI commands get padded out to 12 bytes minimum */
528 cmd_len
= COMMAND_SIZE(rq
->cmd
[0]);
529 if (cmd_len
< ATAPI_MIN_CDB_BYTES
)
530 cmd_len
= ATAPI_MIN_CDB_BYTES
;
532 timeout
= rq
->timeout
;
533 expiry
= ide_cd_expiry
;
537 cmd_len
= ATAPI_MIN_CDB_BYTES
;
540 * If necessary schedule the packet transfer to occur 'timeout'
541 * miliseconds later in ide_delayed_transfer_pc() after the
542 * device says it's ready for a packet.
544 if (drive
->atapi_flags
& IDE_AFLAG_ZIP_DRIVE
) {
545 timeout
= drive
->pc_delay
;
546 expiry
= &ide_delayed_transfer_pc
;
548 timeout
= (drive
->media
== ide_floppy
) ? WAIT_FLOPPY_CMD
553 ireason
= ide_read_ireason(drive
);
554 if (drive
->media
== ide_tape
)
555 ireason
= ide_wait_ireason(drive
, ireason
);
557 if ((ireason
& ATAPI_COD
) == 0 || (ireason
& ATAPI_IO
)) {
558 printk(KERN_ERR
"%s: (IO,CoD) != (0,1) while issuing "
559 "a packet command\n", drive
->name
);
561 return ide_do_reset(drive
);
565 /* Set the interrupt routine */
566 ide_set_handler(drive
,
567 (dev_is_idecd(drive
) ? drive
->irq_handler
571 /* Send the actual packet */
572 if ((drive
->atapi_flags
& IDE_AFLAG_ZIP_DRIVE
) == 0)
573 hwif
->tp_ops
->output_data(drive
, NULL
, rq
->cmd
, cmd_len
);
575 /* Begin DMA, if necessary */
576 if (dev_is_idecd(drive
)) {
578 hwif
->dma_ops
->dma_start(drive
);
580 if (pc
->flags
& PC_FLAG_DMA_OK
) {
581 pc
->flags
|= PC_FLAG_DMA_IN_PROGRESS
;
582 hwif
->dma_ops
->dma_start(drive
);
589 ide_startstop_t
ide_issue_pc(ide_drive_t
*drive
)
591 struct ide_atapi_pc
*pc
;
592 ide_hwif_t
*hwif
= drive
->hwif
;
593 ide_expiry_t
*expiry
= NULL
;
594 unsigned int timeout
;
598 if (dev_is_idecd(drive
)) {
599 tf_flags
= IDE_TFLAG_OUT_NSECT
| IDE_TFLAG_OUT_LBAL
;
600 bcount
= ide_cd_get_xferlen(hwif
->rq
);
601 expiry
= ide_cd_expiry
;
602 timeout
= ATAPI_WAIT_PC
;
605 drive
->dma
= !hwif
->dma_ops
->dma_setup(drive
);
609 /* We haven't transferred any data yet */
611 pc
->cur_pos
= pc
->buf
;
613 tf_flags
= IDE_TFLAG_OUT_DEVICE
;
614 bcount
= ((drive
->media
== ide_tape
) ?
616 min(pc
->req_xfer
, 63 * 1024));
618 if (pc
->flags
& PC_FLAG_DMA_ERROR
) {
619 pc
->flags
&= ~PC_FLAG_DMA_ERROR
;
623 if ((pc
->flags
& PC_FLAG_DMA_OK
) &&
624 (drive
->dev_flags
& IDE_DFLAG_USING_DMA
))
625 drive
->dma
= !hwif
->dma_ops
->dma_setup(drive
);
628 pc
->flags
&= ~PC_FLAG_DMA_OK
;
630 timeout
= (drive
->media
== ide_floppy
) ? WAIT_FLOPPY_CMD
634 ide_pktcmd_tf_load(drive
, tf_flags
, bcount
, drive
->dma
);
636 /* Issue the packet command */
637 if (drive
->atapi_flags
& IDE_AFLAG_DRQ_INTERRUPT
) {
639 drive
->waiting_for_dma
= 0;
640 ide_execute_command(drive
, ATA_CMD_PACKET
, ide_transfer_pc
,
644 ide_execute_pkt_cmd(drive
);
645 return ide_transfer_pc(drive
);
648 EXPORT_SYMBOL_GPL(ide_issue_pc
);