4 * Basic PIO and command management functionality.
6 * This code was split off from ide.c. See ide.c for history and original
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2, or (at your option) any
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * For the avoidance of doubt the "preferred form" of this code is one which
20 * is in an open non patent encumbered format. Where cryptographic key signing
21 * forms part of the process of creating an executable the information
22 * including keys needed to generate an equivalently functional executable
23 * are deemed to be part of the source code.
27 #include <linux/module.h>
28 #include <linux/types.h>
29 #include <linux/string.h>
30 #include <linux/kernel.h>
31 #include <linux/timer.h>
33 #include <linux/interrupt.h>
34 #include <linux/major.h>
35 #include <linux/errno.h>
36 #include <linux/genhd.h>
37 #include <linux/blkpg.h>
38 #include <linux/slab.h>
39 #include <linux/init.h>
40 #include <linux/pci.h>
41 #include <linux/delay.h>
42 #include <linux/ide.h>
43 #include <linux/hdreg.h>
44 #include <linux/completion.h>
45 #include <linux/reboot.h>
46 #include <linux/cdrom.h>
47 #include <linux/seq_file.h>
48 #include <linux/device.h>
49 #include <linux/kmod.h>
50 #include <linux/scatterlist.h>
51 #include <linux/bitops.h>
53 #include <asm/byteorder.h>
55 #include <asm/uaccess.h>
58 static int __ide_end_request(ide_drive_t
*drive
, struct request
*rq
,
59 int uptodate
, unsigned int nr_bytes
, int dequeue
)
65 error
= uptodate
? uptodate
: -EIO
;
68 * if failfast is set on a request, override number of sectors and
69 * complete the whole request right now
71 if (blk_noretry_request(rq
) && error
)
72 nr_bytes
= rq
->hard_nr_sectors
<< 9;
74 if (!blk_fs_request(rq
) && error
&& !rq
->errors
)
78 * decide whether to reenable DMA -- 3 is a random magic for now,
79 * if we DMA timeout more than 3 times, just stay in PIO
81 if ((drive
->dev_flags
& IDE_DFLAG_DMA_PIO_RETRY
) &&
82 drive
->retry_pio
<= 3) {
83 drive
->dev_flags
&= ~IDE_DFLAG_DMA_PIO_RETRY
;
87 if (!__blk_end_request(rq
, error
, nr_bytes
)) {
89 HWGROUP(drive
)->rq
= NULL
;
97 * ide_end_request - complete an IDE I/O
98 * @drive: IDE device for the I/O
100 * @nr_sectors: number of sectors completed
102 * This is our end_request wrapper function. We complete the I/O
103 * update random number input and dequeue the request, which if
104 * it was tagged may be out of order.
107 int ide_end_request (ide_drive_t
*drive
, int uptodate
, int nr_sectors
)
109 unsigned int nr_bytes
= nr_sectors
<< 9;
115 * room for locking improvements here, the calls below don't
116 * need the queue lock held at all
118 spin_lock_irqsave(&ide_lock
, flags
);
119 rq
= HWGROUP(drive
)->rq
;
122 if (blk_pc_request(rq
))
123 nr_bytes
= rq
->data_len
;
125 nr_bytes
= rq
->hard_cur_sectors
<< 9;
128 ret
= __ide_end_request(drive
, rq
, uptodate
, nr_bytes
, 1);
130 spin_unlock_irqrestore(&ide_lock
, flags
);
133 EXPORT_SYMBOL(ide_end_request
);
135 static void ide_complete_power_step(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 error
)
137 struct request_pm_state
*pm
= rq
->data
;
139 if (drive
->media
!= ide_disk
)
142 switch (pm
->pm_step
) {
143 case IDE_PM_FLUSH_CACHE
: /* Suspend step 1 (flush cache) */
144 if (pm
->pm_state
== PM_EVENT_FREEZE
)
145 pm
->pm_step
= IDE_PM_COMPLETED
;
147 pm
->pm_step
= IDE_PM_STANDBY
;
149 case IDE_PM_STANDBY
: /* Suspend step 2 (standby) */
150 pm
->pm_step
= IDE_PM_COMPLETED
;
152 case IDE_PM_RESTORE_PIO
: /* Resume step 1 (restore PIO) */
153 pm
->pm_step
= IDE_PM_IDLE
;
155 case IDE_PM_IDLE
: /* Resume step 2 (idle)*/
156 pm
->pm_step
= IDE_PM_RESTORE_DMA
;
161 static ide_startstop_t
ide_start_power_step(ide_drive_t
*drive
, struct request
*rq
)
163 struct request_pm_state
*pm
= rq
->data
;
164 ide_task_t
*args
= rq
->special
;
166 memset(args
, 0, sizeof(*args
));
168 switch (pm
->pm_step
) {
169 case IDE_PM_FLUSH_CACHE
: /* Suspend step 1 (flush cache) */
170 if (drive
->media
!= ide_disk
)
172 /* Not supported? Switch to next step now. */
173 if (ata_id_flush_enabled(drive
->id
) == 0 ||
174 (drive
->dev_flags
& IDE_DFLAG_WCACHE
) == 0) {
175 ide_complete_power_step(drive
, rq
, 0, 0);
178 if (ata_id_flush_ext_enabled(drive
->id
))
179 args
->tf
.command
= ATA_CMD_FLUSH_EXT
;
181 args
->tf
.command
= ATA_CMD_FLUSH
;
183 case IDE_PM_STANDBY
: /* Suspend step 2 (standby) */
184 args
->tf
.command
= ATA_CMD_STANDBYNOW1
;
186 case IDE_PM_RESTORE_PIO
: /* Resume step 1 (restore PIO) */
187 ide_set_max_pio(drive
);
189 * skip IDE_PM_IDLE for ATAPI devices
191 if (drive
->media
!= ide_disk
)
192 pm
->pm_step
= IDE_PM_RESTORE_DMA
;
194 ide_complete_power_step(drive
, rq
, 0, 0);
196 case IDE_PM_IDLE
: /* Resume step 2 (idle) */
197 args
->tf
.command
= ATA_CMD_IDLEIMMEDIATE
;
199 case IDE_PM_RESTORE_DMA
: /* Resume step 3 (restore DMA) */
201 * Right now, all we do is call ide_set_dma(drive),
202 * we could be smarter and check for current xfer_speed
203 * in struct drive etc...
205 if (drive
->hwif
->dma_ops
== NULL
)
208 * TODO: respect IDE_DFLAG_USING_DMA
214 pm
->pm_step
= IDE_PM_COMPLETED
;
218 args
->tf_flags
= IDE_TFLAG_TF
| IDE_TFLAG_DEVICE
;
219 args
->data_phase
= TASKFILE_NO_DATA
;
220 return do_rw_taskfile(drive
, args
);
224 * ide_end_dequeued_request - complete an IDE I/O
225 * @drive: IDE device for the I/O
227 * @nr_sectors: number of sectors completed
229 * Complete an I/O that is no longer on the request queue. This
230 * typically occurs when we pull the request and issue a REQUEST_SENSE.
231 * We must still finish the old request but we must not tamper with the
232 * queue in the meantime.
234 * NOTE: This path does not handle barrier, but barrier is not supported
238 int ide_end_dequeued_request(ide_drive_t
*drive
, struct request
*rq
,
239 int uptodate
, int nr_sectors
)
244 spin_lock_irqsave(&ide_lock
, flags
);
245 BUG_ON(!blk_rq_started(rq
));
246 ret
= __ide_end_request(drive
, rq
, uptodate
, nr_sectors
<< 9, 0);
247 spin_unlock_irqrestore(&ide_lock
, flags
);
251 EXPORT_SYMBOL_GPL(ide_end_dequeued_request
);
255 * ide_complete_pm_request - end the current Power Management request
256 * @drive: target drive
259 * This function cleans up the current PM request and stops the queue
262 static void ide_complete_pm_request (ide_drive_t
*drive
, struct request
*rq
)
267 printk("%s: completing PM request, %s\n", drive
->name
,
268 blk_pm_suspend_request(rq
) ? "suspend" : "resume");
270 spin_lock_irqsave(&ide_lock
, flags
);
271 if (blk_pm_suspend_request(rq
)) {
272 blk_stop_queue(drive
->queue
);
274 drive
->dev_flags
&= ~IDE_DFLAG_BLOCKED
;
275 blk_start_queue(drive
->queue
);
277 HWGROUP(drive
)->rq
= NULL
;
278 if (__blk_end_request(rq
, 0, 0))
280 spin_unlock_irqrestore(&ide_lock
, flags
);
284 * ide_end_drive_cmd - end an explicit drive command
289 * Clean up after success/failure of an explicit drive command.
290 * These get thrown onto the queue so they are synchronized with
291 * real I/O operations on the drive.
293 * In LBA48 mode we have to read the register set twice to get
294 * all the extra information out.
297 void ide_end_drive_cmd (ide_drive_t
*drive
, u8 stat
, u8 err
)
302 spin_lock_irqsave(&ide_lock
, flags
);
303 rq
= HWGROUP(drive
)->rq
;
304 spin_unlock_irqrestore(&ide_lock
, flags
);
306 if (rq
->cmd_type
== REQ_TYPE_ATA_TASKFILE
) {
307 ide_task_t
*task
= (ide_task_t
*)rq
->special
;
310 rq
->errors
= !OK_STAT(stat
, ATA_DRDY
, BAD_STAT
);
313 struct ide_taskfile
*tf
= &task
->tf
;
318 drive
->hwif
->tp_ops
->tf_read(drive
, task
);
320 if (task
->tf_flags
& IDE_TFLAG_DYN
)
323 } else if (blk_pm_request(rq
)) {
324 struct request_pm_state
*pm
= rq
->data
;
326 printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n",
327 drive
->name
, rq
->pm
->pm_step
, stat
, err
);
329 ide_complete_power_step(drive
, rq
, stat
, err
);
330 if (pm
->pm_step
== IDE_PM_COMPLETED
)
331 ide_complete_pm_request(drive
, rq
);
335 spin_lock_irqsave(&ide_lock
, flags
);
336 HWGROUP(drive
)->rq
= NULL
;
338 if (unlikely(__blk_end_request(rq
, (rq
->errors
? -EIO
: 0),
341 spin_unlock_irqrestore(&ide_lock
, flags
);
344 EXPORT_SYMBOL(ide_end_drive_cmd
);
346 static void ide_kill_rq(ide_drive_t
*drive
, struct request
*rq
)
351 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
352 drv
->end_request(drive
, 0, 0);
354 ide_end_request(drive
, 0, 0);
357 static ide_startstop_t
ide_ata_error(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 err
)
359 ide_hwif_t
*hwif
= drive
->hwif
;
361 if ((stat
& ATA_BUSY
) ||
362 ((stat
& ATA_DF
) && (drive
->dev_flags
& IDE_DFLAG_NOWERR
) == 0)) {
363 /* other bits are useless when BUSY */
364 rq
->errors
|= ERROR_RESET
;
365 } else if (stat
& ATA_ERR
) {
366 /* err has different meaning on cdrom and tape */
367 if (err
== ATA_ABORTED
) {
368 if ((drive
->dev_flags
& IDE_DFLAG_LBA
) &&
369 /* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */
370 hwif
->tp_ops
->read_status(hwif
) == ATA_CMD_INIT_DEV_PARAMS
)
372 } else if ((err
& BAD_CRC
) == BAD_CRC
) {
373 /* UDMA crc error, just retry the operation */
375 } else if (err
& (ATA_BBK
| ATA_UNC
)) {
376 /* retries won't help these */
377 rq
->errors
= ERROR_MAX
;
378 } else if (err
& ATA_TRK0NF
) {
379 /* help it find track zero */
380 rq
->errors
|= ERROR_RECAL
;
384 if ((stat
& ATA_DRQ
) && rq_data_dir(rq
) == READ
&&
385 (hwif
->host_flags
& IDE_HFLAG_ERROR_STOPS_FIFO
) == 0) {
386 int nsect
= drive
->mult_count
? drive
->mult_count
: 1;
388 ide_pad_transfer(drive
, READ
, nsect
* SECTOR_SIZE
);
391 if (rq
->errors
>= ERROR_MAX
|| blk_noretry_request(rq
)) {
392 ide_kill_rq(drive
, rq
);
396 if (hwif
->tp_ops
->read_status(hwif
) & (ATA_BUSY
| ATA_DRQ
))
397 rq
->errors
|= ERROR_RESET
;
399 if ((rq
->errors
& ERROR_RESET
) == ERROR_RESET
) {
401 return ide_do_reset(drive
);
404 if ((rq
->errors
& ERROR_RECAL
) == ERROR_RECAL
)
405 drive
->special
.b
.recalibrate
= 1;
412 static ide_startstop_t
ide_atapi_error(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 err
)
414 ide_hwif_t
*hwif
= drive
->hwif
;
416 if ((stat
& ATA_BUSY
) ||
417 ((stat
& ATA_DF
) && (drive
->dev_flags
& IDE_DFLAG_NOWERR
) == 0)) {
418 /* other bits are useless when BUSY */
419 rq
->errors
|= ERROR_RESET
;
421 /* add decoding error stuff */
424 if (hwif
->tp_ops
->read_status(hwif
) & (ATA_BUSY
| ATA_DRQ
))
426 hwif
->tp_ops
->exec_command(hwif
, ATA_CMD_IDLEIMMEDIATE
);
428 if (rq
->errors
>= ERROR_MAX
) {
429 ide_kill_rq(drive
, rq
);
431 if ((rq
->errors
& ERROR_RESET
) == ERROR_RESET
) {
433 return ide_do_reset(drive
);
442 __ide_error(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 err
)
444 if (drive
->media
== ide_disk
)
445 return ide_ata_error(drive
, rq
, stat
, err
);
446 return ide_atapi_error(drive
, rq
, stat
, err
);
449 EXPORT_SYMBOL_GPL(__ide_error
);
452 * ide_error - handle an error on the IDE
453 * @drive: drive the error occurred on
454 * @msg: message to report
457 * ide_error() takes action based on the error returned by the drive.
458 * For normal I/O that may well include retries. We deal with
459 * both new-style (taskfile) and old style command handling here.
460 * In the case of taskfile command handling there is work left to
464 ide_startstop_t
ide_error (ide_drive_t
*drive
, const char *msg
, u8 stat
)
469 err
= ide_dump_status(drive
, msg
, stat
);
471 if ((rq
= HWGROUP(drive
)->rq
) == NULL
)
474 /* retry only "normal" I/O: */
475 if (!blk_fs_request(rq
)) {
477 ide_end_drive_cmd(drive
, stat
, err
);
484 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
485 return drv
->error(drive
, rq
, stat
, err
);
487 return __ide_error(drive
, rq
, stat
, err
);
490 EXPORT_SYMBOL_GPL(ide_error
);
492 static void ide_tf_set_specify_cmd(ide_drive_t
*drive
, struct ide_taskfile
*tf
)
494 tf
->nsect
= drive
->sect
;
495 tf
->lbal
= drive
->sect
;
496 tf
->lbam
= drive
->cyl
;
497 tf
->lbah
= drive
->cyl
>> 8;
498 tf
->device
= (drive
->head
- 1) | drive
->select
;
499 tf
->command
= ATA_CMD_INIT_DEV_PARAMS
;
502 static void ide_tf_set_restore_cmd(ide_drive_t
*drive
, struct ide_taskfile
*tf
)
504 tf
->nsect
= drive
->sect
;
505 tf
->command
= ATA_CMD_RESTORE
;
508 static void ide_tf_set_setmult_cmd(ide_drive_t
*drive
, struct ide_taskfile
*tf
)
510 tf
->nsect
= drive
->mult_req
;
511 tf
->command
= ATA_CMD_SET_MULTI
;
514 static ide_startstop_t
ide_disk_special(ide_drive_t
*drive
)
516 special_t
*s
= &drive
->special
;
519 memset(&args
, 0, sizeof(ide_task_t
));
520 args
.data_phase
= TASKFILE_NO_DATA
;
522 if (s
->b
.set_geometry
) {
523 s
->b
.set_geometry
= 0;
524 ide_tf_set_specify_cmd(drive
, &args
.tf
);
525 } else if (s
->b
.recalibrate
) {
526 s
->b
.recalibrate
= 0;
527 ide_tf_set_restore_cmd(drive
, &args
.tf
);
528 } else if (s
->b
.set_multmode
) {
529 s
->b
.set_multmode
= 0;
530 ide_tf_set_setmult_cmd(drive
, &args
.tf
);
532 int special
= s
->all
;
534 printk(KERN_ERR
"%s: bad special flag: 0x%02x\n", drive
->name
, special
);
538 args
.tf_flags
= IDE_TFLAG_TF
| IDE_TFLAG_DEVICE
|
539 IDE_TFLAG_CUSTOM_HANDLER
;
541 do_rw_taskfile(drive
, &args
);
547 * do_special - issue some special commands
548 * @drive: drive the command is for
550 * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS,
551 * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive.
553 * It used to do much more, but has been scaled back.
556 static ide_startstop_t
do_special (ide_drive_t
*drive
)
558 special_t
*s
= &drive
->special
;
561 printk("%s: do_special: 0x%02x\n", drive
->name
, s
->all
);
563 if (drive
->media
== ide_disk
)
564 return ide_disk_special(drive
);
571 void ide_map_sg(ide_drive_t
*drive
, struct request
*rq
)
573 ide_hwif_t
*hwif
= drive
->hwif
;
574 struct scatterlist
*sg
= hwif
->sg_table
;
576 if (hwif
->sg_mapped
) /* needed by ide-scsi */
579 if (rq
->cmd_type
!= REQ_TYPE_ATA_TASKFILE
) {
580 hwif
->sg_nents
= blk_rq_map_sg(drive
->queue
, rq
, sg
);
582 sg_init_one(sg
, rq
->buffer
, rq
->nr_sectors
* SECTOR_SIZE
);
587 EXPORT_SYMBOL_GPL(ide_map_sg
);
589 void ide_init_sg_cmd(ide_drive_t
*drive
, struct request
*rq
)
591 ide_hwif_t
*hwif
= drive
->hwif
;
593 hwif
->nsect
= hwif
->nleft
= rq
->nr_sectors
;
598 EXPORT_SYMBOL_GPL(ide_init_sg_cmd
);
601 * execute_drive_command - issue special drive command
602 * @drive: the drive to issue the command on
603 * @rq: the request structure holding the command
605 * execute_drive_cmd() issues a special drive command, usually
606 * initiated by ioctl() from the external hdparm program. The
607 * command can be a drive command, drive task or taskfile
608 * operation. Weirdly you can call it with NULL to wait for
609 * all commands to finish. Don't do this as that is due to change
612 static ide_startstop_t
execute_drive_cmd (ide_drive_t
*drive
,
615 ide_hwif_t
*hwif
= HWIF(drive
);
616 ide_task_t
*task
= rq
->special
;
619 hwif
->data_phase
= task
->data_phase
;
621 switch (hwif
->data_phase
) {
622 case TASKFILE_MULTI_OUT
:
624 case TASKFILE_MULTI_IN
:
626 ide_init_sg_cmd(drive
, rq
);
627 ide_map_sg(drive
, rq
);
632 return do_rw_taskfile(drive
, task
);
636 * NULL is actually a valid way of waiting for
637 * all current requests to be flushed from the queue.
640 printk("%s: DRIVE_CMD (null)\n", drive
->name
);
642 ide_end_drive_cmd(drive
, hwif
->tp_ops
->read_status(hwif
),
643 ide_read_error(drive
));
648 int ide_devset_execute(ide_drive_t
*drive
, const struct ide_devset
*setting
,
651 struct request_queue
*q
= drive
->queue
;
655 if (!(setting
->flags
& DS_SYNC
))
656 return setting
->set(drive
, arg
);
658 rq
= blk_get_request(q
, READ
, GFP_KERNEL
);
662 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
664 rq
->cmd
[0] = REQ_DEVSET_EXEC
;
665 *(int *)&rq
->cmd
[1] = arg
;
666 rq
->special
= setting
->set
;
668 if (blk_execute_rq(q
, NULL
, rq
, 0))
674 EXPORT_SYMBOL_GPL(ide_devset_execute
);
676 static ide_startstop_t
ide_special_rq(ide_drive_t
*drive
, struct request
*rq
)
678 switch (rq
->cmd
[0]) {
679 case REQ_DEVSET_EXEC
:
681 int err
, (*setfunc
)(ide_drive_t
*, int) = rq
->special
;
683 err
= setfunc(drive
, *(int *)&rq
->cmd
[1]);
688 ide_end_request(drive
, err
, 0);
691 case REQ_DRIVE_RESET
:
692 return ide_do_reset(drive
);
694 blk_dump_rq_flags(rq
, "ide_special_rq - bad request");
695 ide_end_request(drive
, 0, 0);
700 static void ide_check_pm_state(ide_drive_t
*drive
, struct request
*rq
)
702 struct request_pm_state
*pm
= rq
->data
;
704 if (blk_pm_suspend_request(rq
) &&
705 pm
->pm_step
== IDE_PM_START_SUSPEND
)
706 /* Mark drive blocked when starting the suspend sequence. */
707 drive
->dev_flags
|= IDE_DFLAG_BLOCKED
;
708 else if (blk_pm_resume_request(rq
) &&
709 pm
->pm_step
== IDE_PM_START_RESUME
) {
711 * The first thing we do on wakeup is to wait for BSY bit to
712 * go away (with a looong timeout) as a drive on this hwif may
713 * just be POSTing itself.
714 * We do that before even selecting as the "other" device on
715 * the bus may be broken enough to walk on our toes at this
718 ide_hwif_t
*hwif
= drive
->hwif
;
721 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive
->name
);
723 rc
= ide_wait_not_busy(hwif
, 35000);
725 printk(KERN_WARNING
"%s: bus not ready on wakeup\n", drive
->name
);
727 hwif
->tp_ops
->set_irq(hwif
, 1);
728 rc
= ide_wait_not_busy(hwif
, 100000);
730 printk(KERN_WARNING
"%s: drive not ready on wakeup\n", drive
->name
);
735 * start_request - start of I/O and command issuing for IDE
737 * start_request() initiates handling of a new I/O request. It
738 * accepts commands and I/O (read/write) requests.
740 * FIXME: this function needs a rename
743 static ide_startstop_t
start_request (ide_drive_t
*drive
, struct request
*rq
)
745 ide_startstop_t startstop
;
747 BUG_ON(!blk_rq_started(rq
));
750 printk("%s: start_request: current=0x%08lx\n",
751 HWIF(drive
)->name
, (unsigned long) rq
);
754 /* bail early if we've exceeded max_failures */
755 if (drive
->max_failures
&& (drive
->failures
> drive
->max_failures
)) {
756 rq
->cmd_flags
|= REQ_FAILED
;
760 if (blk_pm_request(rq
))
761 ide_check_pm_state(drive
, rq
);
764 if (ide_wait_stat(&startstop
, drive
, drive
->ready_stat
,
765 ATA_BUSY
| ATA_DRQ
, WAIT_READY
)) {
766 printk(KERN_ERR
"%s: drive not ready for command\n", drive
->name
);
769 if (!drive
->special
.all
) {
773 * We reset the drive so we need to issue a SETFEATURES.
774 * Do it _after_ do_special() restored device parameters.
776 if (drive
->current_speed
== 0xff)
777 ide_config_drive_speed(drive
, drive
->desired_speed
);
779 if (rq
->cmd_type
== REQ_TYPE_ATA_TASKFILE
)
780 return execute_drive_cmd(drive
, rq
);
781 else if (blk_pm_request(rq
)) {
782 struct request_pm_state
*pm
= rq
->data
;
784 printk("%s: start_power_step(step: %d)\n",
785 drive
->name
, rq
->pm
->pm_step
);
787 startstop
= ide_start_power_step(drive
, rq
);
788 if (startstop
== ide_stopped
&&
789 pm
->pm_step
== IDE_PM_COMPLETED
)
790 ide_complete_pm_request(drive
, rq
);
792 } else if (!rq
->rq_disk
&& blk_special_request(rq
))
794 * TODO: Once all ULDs have been modified to
795 * check for specific op codes rather than
796 * blindly accepting any special request, the
797 * check for ->rq_disk above may be replaced
798 * by a more suitable mechanism or even
801 return ide_special_rq(drive
, rq
);
803 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
805 return drv
->do_request(drive
, rq
, rq
->sector
);
807 return do_special(drive
);
809 ide_kill_rq(drive
, rq
);
814 * ide_stall_queue - pause an IDE device
815 * @drive: drive to stall
816 * @timeout: time to stall for (jiffies)
818 * ide_stall_queue() can be used by a drive to give excess bandwidth back
819 * to the hwgroup by sleeping for timeout jiffies.
822 void ide_stall_queue (ide_drive_t
*drive
, unsigned long timeout
)
824 if (timeout
> WAIT_WORSTCASE
)
825 timeout
= WAIT_WORSTCASE
;
826 drive
->sleep
= timeout
+ jiffies
;
827 drive
->dev_flags
|= IDE_DFLAG_SLEEPING
;
830 EXPORT_SYMBOL(ide_stall_queue
);
832 #define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time)
835 * choose_drive - select a drive to service
836 * @hwgroup: hardware group to select on
838 * choose_drive() selects the next drive which will be serviced.
839 * This is necessary because the IDE layer can't issue commands
840 * to both drives on the same cable, unlike SCSI.
843 static inline ide_drive_t
*choose_drive (ide_hwgroup_t
*hwgroup
)
845 ide_drive_t
*drive
, *best
;
849 drive
= hwgroup
->drive
;
852 * drive is doing pre-flush, ordered write, post-flush sequence. even
853 * though that is 3 requests, it must be seen as a single transaction.
854 * we must not preempt this drive until that is complete
856 if (blk_queue_flushing(drive
->queue
)) {
858 * small race where queue could get replugged during
859 * the 3-request flush cycle, just yank the plug since
860 * we want it to finish asap
862 blk_remove_plug(drive
->queue
);
867 u8 dev_s
= !!(drive
->dev_flags
& IDE_DFLAG_SLEEPING
);
868 u8 best_s
= (best
&& !!(best
->dev_flags
& IDE_DFLAG_SLEEPING
));
870 if ((dev_s
== 0 || time_after_eq(jiffies
, drive
->sleep
)) &&
871 !elv_queue_empty(drive
->queue
)) {
873 (dev_s
&& (best_s
== 0 || time_before(drive
->sleep
, best
->sleep
))) ||
874 (best_s
== 0 && time_before(WAKEUP(drive
), WAKEUP(best
)))) {
875 if (!blk_queue_plugged(drive
->queue
))
879 } while ((drive
= drive
->next
) != hwgroup
->drive
);
881 if (best
&& (best
->dev_flags
& IDE_DFLAG_NICE1
) &&
882 (best
->dev_flags
& IDE_DFLAG_SLEEPING
) == 0 &&
883 best
!= hwgroup
->drive
&& best
->service_time
> WAIT_MIN_SLEEP
) {
884 long t
= (signed long)(WAKEUP(best
) - jiffies
);
885 if (t
>= WAIT_MIN_SLEEP
) {
887 * We *may* have some time to spare, but first let's see if
888 * someone can potentially benefit from our nice mood today..
892 if ((drive
->dev_flags
& IDE_DFLAG_SLEEPING
) == 0
893 && time_before(jiffies
- best
->service_time
, WAKEUP(drive
))
894 && time_before(WAKEUP(drive
), jiffies
+ t
))
896 ide_stall_queue(best
, min_t(long, t
, 10 * WAIT_MIN_SLEEP
));
899 } while ((drive
= drive
->next
) != best
);
906 * Issue a new request to a drive from hwgroup
907 * Caller must have already done spin_lock_irqsave(&ide_lock, ..);
909 * A hwgroup is a serialized group of IDE interfaces. Usually there is
910 * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640)
911 * may have both interfaces in a single hwgroup to "serialize" access.
912 * Or possibly multiple ISA interfaces can share a common IRQ by being grouped
913 * together into one hwgroup for serialized access.
915 * Note also that several hwgroups can end up sharing a single IRQ,
916 * possibly along with many other devices. This is especially common in
917 * PCI-based systems with off-board IDE controller cards.
919 * The IDE driver uses the single global ide_lock spinlock to protect
920 * access to the request queues, and to protect the hwgroup->busy flag.
922 * The first thread into the driver for a particular hwgroup sets the
923 * hwgroup->busy flag to indicate that this hwgroup is now active,
924 * and then initiates processing of the top request from the request queue.
926 * Other threads attempting entry notice the busy setting, and will simply
927 * queue their new requests and exit immediately. Note that hwgroup->busy
928 * remains set even when the driver is merely awaiting the next interrupt.
929 * Thus, the meaning is "this hwgroup is busy processing a request".
931 * When processing of a request completes, the completing thread or IRQ-handler
932 * will start the next request from the queue. If no more work remains,
933 * the driver will clear the hwgroup->busy flag and exit.
935 * The ide_lock (spinlock) is used to protect all access to the
936 * hwgroup->busy flag, but is otherwise not needed for most processing in
937 * the driver. This makes the driver much more friendlier to shared IRQs
938 * than previous designs, while remaining 100% (?) SMP safe and capable.
940 static void ide_do_request (ide_hwgroup_t
*hwgroup
, int masked_irq
)
945 ide_startstop_t startstop
;
948 /* for atari only: POSSIBLY BROKEN HERE(?) */
949 ide_get_lock(ide_intr
, hwgroup
);
951 /* caller must own ide_lock */
952 BUG_ON(!irqs_disabled());
954 while (!hwgroup
->busy
) {
956 drive
= choose_drive(hwgroup
);
959 unsigned long sleep
= 0; /* shut up, gcc */
961 drive
= hwgroup
->drive
;
963 if ((drive
->dev_flags
& IDE_DFLAG_SLEEPING
) &&
965 time_before(drive
->sleep
, sleep
))) {
967 sleep
= drive
->sleep
;
969 } while ((drive
= drive
->next
) != hwgroup
->drive
);
972 * Take a short snooze, and then wake up this hwgroup again.
973 * This gives other hwgroups on the same a chance to
974 * play fairly with us, just in case there are big differences
975 * in relative throughputs.. don't want to hog the cpu too much.
977 if (time_before(sleep
, jiffies
+ WAIT_MIN_SLEEP
))
978 sleep
= jiffies
+ WAIT_MIN_SLEEP
;
980 if (timer_pending(&hwgroup
->timer
))
981 printk(KERN_CRIT
"ide_set_handler: timer already active\n");
983 /* so that ide_timer_expiry knows what to do */
984 hwgroup
->sleeping
= 1;
985 hwgroup
->req_gen_timer
= hwgroup
->req_gen
;
986 mod_timer(&hwgroup
->timer
, sleep
);
987 /* we purposely leave hwgroup->busy==1
990 /* Ugly, but how can we sleep for the lock
991 * otherwise? perhaps from tq_disk?
999 /* no more work for this hwgroup (for now) */
1004 if (hwgroup
->hwif
->sharing_irq
&& hwif
!= hwgroup
->hwif
) {
1006 * set nIEN for previous hwif, drives in the
1007 * quirk_list may not like intr setups/cleanups
1009 if (drive
->quirk_list
!= 1)
1010 hwif
->tp_ops
->set_irq(hwif
, 0);
1012 hwgroup
->hwif
= hwif
;
1013 hwgroup
->drive
= drive
;
1014 drive
->dev_flags
&= ~IDE_DFLAG_SLEEPING
;
1015 drive
->service_start
= jiffies
;
1017 if (blk_queue_plugged(drive
->queue
)) {
1018 printk(KERN_ERR
"ide: huh? queue was plugged!\n");
1023 * we know that the queue isn't empty, but this can happen
1024 * if the q->prep_rq_fn() decides to kill a request
1026 rq
= elv_next_request(drive
->queue
);
1033 * Sanity: don't accept a request that isn't a PM request
1034 * if we are currently power managed. This is very important as
1035 * blk_stop_queue() doesn't prevent the elv_next_request()
1036 * above to return us whatever is in the queue. Since we call
1037 * ide_do_request() ourselves, we end up taking requests while
1038 * the queue is blocked...
1040 * We let requests forced at head of queue with ide-preempt
1041 * though. I hope that doesn't happen too much, hopefully not
1042 * unless the subdriver triggers such a thing in its own PM
1045 * We count how many times we loop here to make sure we service
1046 * all drives in the hwgroup without looping for ever
1048 if ((drive
->dev_flags
& IDE_DFLAG_BLOCKED
) &&
1049 blk_pm_request(rq
) == 0 &&
1050 (rq
->cmd_flags
& REQ_PREEMPT
) == 0) {
1051 drive
= drive
->next
? drive
->next
: hwgroup
->drive
;
1052 if (loops
++ < 4 && !blk_queue_plugged(drive
->queue
))
1054 /* We clear busy, there should be no pending ATA command at this point. */
1062 * Some systems have trouble with IDE IRQs arriving while
1063 * the driver is still setting things up. So, here we disable
1064 * the IRQ used by this interface while the request is being started.
1065 * This may look bad at first, but pretty much the same thing
1066 * happens anyway when any interrupt comes in, IDE or otherwise
1067 * -- the kernel masks the IRQ while it is being handled.
1069 if (masked_irq
!= IDE_NO_IRQ
&& hwif
->irq
!= masked_irq
)
1070 disable_irq_nosync(hwif
->irq
);
1071 spin_unlock(&ide_lock
);
1072 local_irq_enable_in_hardirq();
1073 /* allow other IRQs while we start this request */
1074 startstop
= start_request(drive
, rq
);
1075 spin_lock_irq(&ide_lock
);
1076 if (masked_irq
!= IDE_NO_IRQ
&& hwif
->irq
!= masked_irq
)
1077 enable_irq(hwif
->irq
);
1078 if (startstop
== ide_stopped
)
1084 * Passes the stuff to ide_do_request
1086 void do_ide_request(struct request_queue
*q
)
1088 ide_drive_t
*drive
= q
->queuedata
;
1090 ide_do_request(HWGROUP(drive
), IDE_NO_IRQ
);
1094 * un-busy the hwgroup etc, and clear any pending DMA status. we want to
1095 * retry the current request in pio mode instead of risking tossing it
1098 static ide_startstop_t
ide_dma_timeout_retry(ide_drive_t
*drive
, int error
)
1100 ide_hwif_t
*hwif
= HWIF(drive
);
1102 ide_startstop_t ret
= ide_stopped
;
1105 * end current dma transaction
1109 printk(KERN_WARNING
"%s: DMA timeout error\n", drive
->name
);
1110 (void)hwif
->dma_ops
->dma_end(drive
);
1111 ret
= ide_error(drive
, "dma timeout error",
1112 hwif
->tp_ops
->read_status(hwif
));
1114 printk(KERN_WARNING
"%s: DMA timeout retry\n", drive
->name
);
1115 hwif
->dma_ops
->dma_timeout(drive
);
1119 * disable dma for now, but remember that we did so because of
1120 * a timeout -- we'll reenable after we finish this next request
1121 * (or rather the first chunk of it) in pio.
1123 drive
->dev_flags
|= IDE_DFLAG_DMA_PIO_RETRY
;
1125 ide_dma_off_quietly(drive
);
1128 * un-busy drive etc (hwgroup->busy is cleared on return) and
1129 * make sure request is sane
1131 rq
= HWGROUP(drive
)->rq
;
1136 HWGROUP(drive
)->rq
= NULL
;
1143 rq
->sector
= rq
->bio
->bi_sector
;
1144 rq
->current_nr_sectors
= bio_iovec(rq
->bio
)->bv_len
>> 9;
1145 rq
->hard_cur_sectors
= rq
->current_nr_sectors
;
1146 rq
->buffer
= bio_data(rq
->bio
);
1152 * ide_timer_expiry - handle lack of an IDE interrupt
1153 * @data: timer callback magic (hwgroup)
1155 * An IDE command has timed out before the expected drive return
1156 * occurred. At this point we attempt to clean up the current
1157 * mess. If the current handler includes an expiry handler then
1158 * we invoke the expiry handler, and providing it is happy the
1159 * work is done. If that fails we apply generic recovery rules
1160 * invoking the handler and checking the drive DMA status. We
1161 * have an excessively incestuous relationship with the DMA
1162 * logic that wants cleaning up.
1165 void ide_timer_expiry (unsigned long data
)
1167 ide_hwgroup_t
*hwgroup
= (ide_hwgroup_t
*) data
;
1168 ide_handler_t
*handler
;
1169 ide_expiry_t
*expiry
;
1170 unsigned long flags
;
1171 unsigned long wait
= -1;
1173 spin_lock_irqsave(&ide_lock
, flags
);
1175 if (((handler
= hwgroup
->handler
) == NULL
) ||
1176 (hwgroup
->req_gen
!= hwgroup
->req_gen_timer
)) {
1178 * Either a marginal timeout occurred
1179 * (got the interrupt just as timer expired),
1180 * or we were "sleeping" to give other devices a chance.
1181 * Either way, we don't really want to complain about anything.
1183 if (hwgroup
->sleeping
) {
1184 hwgroup
->sleeping
= 0;
1188 ide_drive_t
*drive
= hwgroup
->drive
;
1190 printk(KERN_ERR
"ide_timer_expiry: hwgroup->drive was NULL\n");
1191 hwgroup
->handler
= NULL
;
1194 ide_startstop_t startstop
= ide_stopped
;
1195 if (!hwgroup
->busy
) {
1196 hwgroup
->busy
= 1; /* paranoia */
1197 printk(KERN_ERR
"%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive
->name
);
1199 if ((expiry
= hwgroup
->expiry
) != NULL
) {
1201 if ((wait
= expiry(drive
)) > 0) {
1203 hwgroup
->timer
.expires
= jiffies
+ wait
;
1204 hwgroup
->req_gen_timer
= hwgroup
->req_gen
;
1205 add_timer(&hwgroup
->timer
);
1206 spin_unlock_irqrestore(&ide_lock
, flags
);
1210 hwgroup
->handler
= NULL
;
1212 * We need to simulate a real interrupt when invoking
1213 * the handler() function, which means we need to
1214 * globally mask the specific IRQ:
1216 spin_unlock(&ide_lock
);
1218 /* disable_irq_nosync ?? */
1219 disable_irq(hwif
->irq
);
1221 * as if we were handling an interrupt */
1222 local_irq_disable();
1223 if (hwgroup
->polling
) {
1224 startstop
= handler(drive
);
1225 } else if (drive_is_ready(drive
)) {
1226 if (drive
->waiting_for_dma
)
1227 hwif
->dma_ops
->dma_lost_irq(drive
);
1228 (void)ide_ack_intr(hwif
);
1229 printk(KERN_WARNING
"%s: lost interrupt\n", drive
->name
);
1230 startstop
= handler(drive
);
1232 if (drive
->waiting_for_dma
) {
1233 startstop
= ide_dma_timeout_retry(drive
, wait
);
1236 ide_error(drive
, "irq timeout",
1237 hwif
->tp_ops
->read_status(hwif
));
1239 drive
->service_time
= jiffies
- drive
->service_start
;
1240 spin_lock_irq(&ide_lock
);
1241 enable_irq(hwif
->irq
);
1242 if (startstop
== ide_stopped
)
1246 ide_do_request(hwgroup
, IDE_NO_IRQ
);
1247 spin_unlock_irqrestore(&ide_lock
, flags
);
1251 * unexpected_intr - handle an unexpected IDE interrupt
1252 * @irq: interrupt line
1253 * @hwgroup: hwgroup being processed
1255 * There's nothing really useful we can do with an unexpected interrupt,
1256 * other than reading the status register (to clear it), and logging it.
1257 * There should be no way that an irq can happen before we're ready for it,
1258 * so we needn't worry much about losing an "important" interrupt here.
1260 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever
1261 * the drive enters "idle", "standby", or "sleep" mode, so if the status
1262 * looks "good", we just ignore the interrupt completely.
1264 * This routine assumes __cli() is in effect when called.
1266 * If an unexpected interrupt happens on irq15 while we are handling irq14
1267 * and if the two interfaces are "serialized" (CMD640), then it looks like
1268 * we could screw up by interfering with a new request being set up for
1271 * In reality, this is a non-issue. The new command is not sent unless
1272 * the drive is ready to accept one, in which case we know the drive is
1273 * not trying to interrupt us. And ide_set_handler() is always invoked
1274 * before completing the issuance of any new drive command, so we will not
1275 * be accidentally invoked as a result of any valid command completion
1278 * Note that we must walk the entire hwgroup here. We know which hwif
1279 * is doing the current command, but we don't know which hwif burped
1283 static void unexpected_intr (int irq
, ide_hwgroup_t
*hwgroup
)
1286 ide_hwif_t
*hwif
= hwgroup
->hwif
;
1289 * handle the unexpected interrupt
1292 if (hwif
->irq
== irq
) {
1293 stat
= hwif
->tp_ops
->read_status(hwif
);
1295 if (!OK_STAT(stat
, ATA_DRDY
, BAD_STAT
)) {
1296 /* Try to not flood the console with msgs */
1297 static unsigned long last_msgtime
, count
;
1299 if (time_after(jiffies
, last_msgtime
+ HZ
)) {
1300 last_msgtime
= jiffies
;
1301 printk(KERN_ERR
"%s%s: unexpected interrupt, "
1302 "status=0x%02x, count=%ld\n",
1304 (hwif
->next
==hwgroup
->hwif
) ? "" : "(?)", stat
, count
);
1308 } while ((hwif
= hwif
->next
) != hwgroup
->hwif
);
1312 * ide_intr - default IDE interrupt handler
1313 * @irq: interrupt number
1314 * @dev_id: hwif group
1315 * @regs: unused weirdness from the kernel irq layer
1317 * This is the default IRQ handler for the IDE layer. You should
1318 * not need to override it. If you do be aware it is subtle in
1321 * hwgroup->hwif is the interface in the group currently performing
1322 * a command. hwgroup->drive is the drive and hwgroup->handler is
1323 * the IRQ handler to call. As we issue a command the handlers
1324 * step through multiple states, reassigning the handler to the
1325 * next step in the process. Unlike a smart SCSI controller IDE
1326 * expects the main processor to sequence the various transfer
1327 * stages. We also manage a poll timer to catch up with most
1328 * timeout situations. There are still a few where the handlers
1329 * don't ever decide to give up.
1331 * The handler eventually returns ide_stopped to indicate the
1332 * request completed. At this point we issue the next request
1333 * on the hwgroup and the process begins again.
1336 irqreturn_t
ide_intr (int irq
, void *dev_id
)
1338 unsigned long flags
;
1339 ide_hwgroup_t
*hwgroup
= (ide_hwgroup_t
*)dev_id
;
1342 ide_handler_t
*handler
;
1343 ide_startstop_t startstop
;
1345 spin_lock_irqsave(&ide_lock
, flags
);
1346 hwif
= hwgroup
->hwif
;
1348 if (!ide_ack_intr(hwif
)) {
1349 spin_unlock_irqrestore(&ide_lock
, flags
);
1353 if ((handler
= hwgroup
->handler
) == NULL
|| hwgroup
->polling
) {
1355 * Not expecting an interrupt from this drive.
1356 * That means this could be:
1357 * (1) an interrupt from another PCI device
1358 * sharing the same PCI INT# as us.
1359 * or (2) a drive just entered sleep or standby mode,
1360 * and is interrupting to let us know.
1361 * or (3) a spurious interrupt of unknown origin.
1363 * For PCI, we cannot tell the difference,
1364 * so in that case we just ignore it and hope it goes away.
1366 * FIXME: unexpected_intr should be hwif-> then we can
1367 * remove all the ifdef PCI crap
1369 #ifdef CONFIG_BLK_DEV_IDEPCI
1370 if (hwif
->chipset
!= ide_pci
)
1371 #endif /* CONFIG_BLK_DEV_IDEPCI */
1374 * Probably not a shared PCI interrupt,
1375 * so we can safely try to do something about it:
1377 unexpected_intr(irq
, hwgroup
);
1378 #ifdef CONFIG_BLK_DEV_IDEPCI
1381 * Whack the status register, just in case
1382 * we have a leftover pending IRQ.
1384 (void)hwif
->tp_ops
->read_status(hwif
);
1385 #endif /* CONFIG_BLK_DEV_IDEPCI */
1387 spin_unlock_irqrestore(&ide_lock
, flags
);
1390 drive
= hwgroup
->drive
;
1393 * This should NEVER happen, and there isn't much
1394 * we could do about it here.
1396 * [Note - this can occur if the drive is hot unplugged]
1398 spin_unlock_irqrestore(&ide_lock
, flags
);
1401 if (!drive_is_ready(drive
)) {
1403 * This happens regularly when we share a PCI IRQ with
1404 * another device. Unfortunately, it can also happen
1405 * with some buggy drives that trigger the IRQ before
1406 * their status register is up to date. Hopefully we have
1407 * enough advance overhead that the latter isn't a problem.
1409 spin_unlock_irqrestore(&ide_lock
, flags
);
1412 if (!hwgroup
->busy
) {
1413 hwgroup
->busy
= 1; /* paranoia */
1414 printk(KERN_ERR
"%s: ide_intr: hwgroup->busy was 0 ??\n", drive
->name
);
1416 hwgroup
->handler
= NULL
;
1418 del_timer(&hwgroup
->timer
);
1419 spin_unlock(&ide_lock
);
1421 /* Some controllers might set DMA INTR no matter DMA or PIO;
1422 * bmdma status might need to be cleared even for
1423 * PIO interrupts to prevent spurious/lost irq.
1425 if (hwif
->ide_dma_clear_irq
&& !(drive
->waiting_for_dma
))
1426 /* ide_dma_end() needs bmdma status for error checking.
1427 * So, skip clearing bmdma status here and leave it
1428 * to ide_dma_end() if this is dma interrupt.
1430 hwif
->ide_dma_clear_irq(drive
);
1432 if (drive
->dev_flags
& IDE_DFLAG_UNMASK
)
1433 local_irq_enable_in_hardirq();
1434 /* service this interrupt, may set handler for next interrupt */
1435 startstop
= handler(drive
);
1436 spin_lock_irq(&ide_lock
);
1439 * Note that handler() may have set things up for another
1440 * interrupt to occur soon, but it cannot happen until
1441 * we exit from this routine, because it will be the
1442 * same irq as is currently being serviced here, and Linux
1443 * won't allow another of the same (on any CPU) until we return.
1445 drive
->service_time
= jiffies
- drive
->service_start
;
1446 if (startstop
== ide_stopped
) {
1447 if (hwgroup
->handler
== NULL
) { /* paranoia */
1449 ide_do_request(hwgroup
, hwif
->irq
);
1451 printk(KERN_ERR
"%s: ide_intr: huh? expected NULL handler "
1452 "on exit\n", drive
->name
);
1455 spin_unlock_irqrestore(&ide_lock
, flags
);
1460 * ide_do_drive_cmd - issue IDE special command
1461 * @drive: device to issue command
1462 * @rq: request to issue
1464 * This function issues a special IDE device request
1465 * onto the request queue.
1467 * the rq is queued at the head of the request queue, displacing
1468 * the currently-being-processed request and this function
1469 * returns immediately without waiting for the new rq to be
1470 * completed. This is VERY DANGEROUS, and is intended for
1471 * careful use by the ATAPI tape/cdrom driver code.
1474 void ide_do_drive_cmd(ide_drive_t
*drive
, struct request
*rq
)
1476 unsigned long flags
;
1477 ide_hwgroup_t
*hwgroup
= HWGROUP(drive
);
1479 spin_lock_irqsave(&ide_lock
, flags
);
1481 __elv_add_request(drive
->queue
, rq
, ELEVATOR_INSERT_FRONT
, 1);
1482 __generic_unplug_device(drive
->queue
);
1483 spin_unlock_irqrestore(&ide_lock
, flags
);
1486 EXPORT_SYMBOL(ide_do_drive_cmd
);
1488 void ide_pktcmd_tf_load(ide_drive_t
*drive
, u32 tf_flags
, u16 bcount
, u8 dma
)
1490 ide_hwif_t
*hwif
= drive
->hwif
;
1493 memset(&task
, 0, sizeof(task
));
1494 task
.tf_flags
= IDE_TFLAG_OUT_LBAH
| IDE_TFLAG_OUT_LBAM
|
1495 IDE_TFLAG_OUT_FEATURE
| tf_flags
;
1496 task
.tf
.feature
= dma
; /* Use PIO/DMA */
1497 task
.tf
.lbam
= bcount
& 0xff;
1498 task
.tf
.lbah
= (bcount
>> 8) & 0xff;
1500 ide_tf_dump(drive
->name
, &task
.tf
);
1501 hwif
->tp_ops
->set_irq(hwif
, 1);
1502 SELECT_MASK(drive
, 0);
1503 hwif
->tp_ops
->tf_load(drive
, &task
);
1506 EXPORT_SYMBOL_GPL(ide_pktcmd_tf_load
);
1508 void ide_pad_transfer(ide_drive_t
*drive
, int write
, int len
)
1510 ide_hwif_t
*hwif
= drive
->hwif
;
1515 hwif
->tp_ops
->output_data(drive
, NULL
, buf
, min(4, len
));
1517 hwif
->tp_ops
->input_data(drive
, NULL
, buf
, min(4, len
));
1521 EXPORT_SYMBOL_GPL(ide_pad_transfer
);