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
->state
== DMA_PIO_RETRY
&& drive
->retry_pio
<= 3) {
86 if (!__blk_end_request(rq
, error
, nr_bytes
)) {
88 HWGROUP(drive
)->rq
= NULL
;
96 * ide_end_request - complete an IDE I/O
97 * @drive: IDE device for the I/O
99 * @nr_sectors: number of sectors completed
101 * This is our end_request wrapper function. We complete the I/O
102 * update random number input and dequeue the request, which if
103 * it was tagged may be out of order.
106 int ide_end_request (ide_drive_t
*drive
, int uptodate
, int nr_sectors
)
108 unsigned int nr_bytes
= nr_sectors
<< 9;
114 * room for locking improvements here, the calls below don't
115 * need the queue lock held at all
117 spin_lock_irqsave(&ide_lock
, flags
);
118 rq
= HWGROUP(drive
)->rq
;
121 if (blk_pc_request(rq
))
122 nr_bytes
= rq
->data_len
;
124 nr_bytes
= rq
->hard_cur_sectors
<< 9;
127 ret
= __ide_end_request(drive
, rq
, uptodate
, nr_bytes
, 1);
129 spin_unlock_irqrestore(&ide_lock
, flags
);
132 EXPORT_SYMBOL(ide_end_request
);
135 * Power Management state machine. This one is rather trivial for now,
136 * we should probably add more, like switching back to PIO on suspend
137 * to help some BIOSes, re-do the door locking on resume, etc...
141 ide_pm_flush_cache
= ide_pm_state_start_suspend
,
144 idedisk_pm_restore_pio
= ide_pm_state_start_resume
,
149 static void ide_complete_power_step(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 error
)
151 struct request_pm_state
*pm
= rq
->data
;
153 if (drive
->media
!= ide_disk
)
156 switch (pm
->pm_step
) {
157 case ide_pm_flush_cache
: /* Suspend step 1 (flush cache) complete */
158 if (pm
->pm_state
== PM_EVENT_FREEZE
)
159 pm
->pm_step
= ide_pm_state_completed
;
161 pm
->pm_step
= idedisk_pm_standby
;
163 case idedisk_pm_standby
: /* Suspend step 2 (standby) complete */
164 pm
->pm_step
= ide_pm_state_completed
;
166 case idedisk_pm_restore_pio
: /* Resume step 1 complete */
167 pm
->pm_step
= idedisk_pm_idle
;
169 case idedisk_pm_idle
: /* Resume step 2 (idle) complete */
170 pm
->pm_step
= ide_pm_restore_dma
;
175 static ide_startstop_t
ide_start_power_step(ide_drive_t
*drive
, struct request
*rq
)
177 struct request_pm_state
*pm
= rq
->data
;
178 ide_task_t
*args
= rq
->special
;
180 memset(args
, 0, sizeof(*args
));
182 switch (pm
->pm_step
) {
183 case ide_pm_flush_cache
: /* Suspend step 1 (flush cache) */
184 if (drive
->media
!= ide_disk
)
186 /* Not supported? Switch to next step now. */
187 if (!drive
->wcache
|| ata_id_flush_enabled(drive
->id
) == 0) {
188 ide_complete_power_step(drive
, rq
, 0, 0);
191 if (ide_id_has_flush_cache_ext(drive
->id
))
192 args
->tf
.command
= ATA_CMD_FLUSH_EXT
;
194 args
->tf
.command
= ATA_CMD_FLUSH
;
197 case idedisk_pm_standby
: /* Suspend step 2 (standby) */
198 args
->tf
.command
= ATA_CMD_STANDBYNOW1
;
201 case idedisk_pm_restore_pio
: /* Resume step 1 (restore PIO) */
202 ide_set_max_pio(drive
);
204 * skip idedisk_pm_idle for ATAPI devices
206 if (drive
->media
!= ide_disk
)
207 pm
->pm_step
= ide_pm_restore_dma
;
209 ide_complete_power_step(drive
, rq
, 0, 0);
212 case idedisk_pm_idle
: /* Resume step 2 (idle) */
213 args
->tf
.command
= ATA_CMD_IDLEIMMEDIATE
;
216 case ide_pm_restore_dma
: /* Resume step 3 (restore DMA) */
218 * Right now, all we do is call ide_set_dma(drive),
219 * we could be smarter and check for current xfer_speed
220 * in struct drive etc...
222 if (drive
->hwif
->dma_ops
== NULL
)
225 * TODO: respect ->using_dma setting
230 pm
->pm_step
= ide_pm_state_completed
;
234 args
->tf_flags
= IDE_TFLAG_TF
| IDE_TFLAG_DEVICE
;
235 args
->data_phase
= TASKFILE_NO_DATA
;
236 return do_rw_taskfile(drive
, args
);
240 * ide_end_dequeued_request - complete an IDE I/O
241 * @drive: IDE device for the I/O
243 * @nr_sectors: number of sectors completed
245 * Complete an I/O that is no longer on the request queue. This
246 * typically occurs when we pull the request and issue a REQUEST_SENSE.
247 * We must still finish the old request but we must not tamper with the
248 * queue in the meantime.
250 * NOTE: This path does not handle barrier, but barrier is not supported
254 int ide_end_dequeued_request(ide_drive_t
*drive
, struct request
*rq
,
255 int uptodate
, int nr_sectors
)
260 spin_lock_irqsave(&ide_lock
, flags
);
261 BUG_ON(!blk_rq_started(rq
));
262 ret
= __ide_end_request(drive
, rq
, uptodate
, nr_sectors
<< 9, 0);
263 spin_unlock_irqrestore(&ide_lock
, flags
);
267 EXPORT_SYMBOL_GPL(ide_end_dequeued_request
);
271 * ide_complete_pm_request - end the current Power Management request
272 * @drive: target drive
275 * This function cleans up the current PM request and stops the queue
278 static void ide_complete_pm_request (ide_drive_t
*drive
, struct request
*rq
)
283 printk("%s: completing PM request, %s\n", drive
->name
,
284 blk_pm_suspend_request(rq
) ? "suspend" : "resume");
286 spin_lock_irqsave(&ide_lock
, flags
);
287 if (blk_pm_suspend_request(rq
)) {
288 blk_stop_queue(drive
->queue
);
291 blk_start_queue(drive
->queue
);
293 HWGROUP(drive
)->rq
= NULL
;
294 if (__blk_end_request(rq
, 0, 0))
296 spin_unlock_irqrestore(&ide_lock
, flags
);
300 * ide_end_drive_cmd - end an explicit drive command
305 * Clean up after success/failure of an explicit drive command.
306 * These get thrown onto the queue so they are synchronized with
307 * real I/O operations on the drive.
309 * In LBA48 mode we have to read the register set twice to get
310 * all the extra information out.
313 void ide_end_drive_cmd (ide_drive_t
*drive
, u8 stat
, u8 err
)
318 spin_lock_irqsave(&ide_lock
, flags
);
319 rq
= HWGROUP(drive
)->rq
;
320 spin_unlock_irqrestore(&ide_lock
, flags
);
322 if (rq
->cmd_type
== REQ_TYPE_ATA_TASKFILE
) {
323 ide_task_t
*task
= (ide_task_t
*)rq
->special
;
326 rq
->errors
= !OK_STAT(stat
, ATA_DRDY
, BAD_STAT
);
329 struct ide_taskfile
*tf
= &task
->tf
;
334 drive
->hwif
->tp_ops
->tf_read(drive
, task
);
336 if (task
->tf_flags
& IDE_TFLAG_DYN
)
339 } else if (blk_pm_request(rq
)) {
340 struct request_pm_state
*pm
= rq
->data
;
342 printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n",
343 drive
->name
, rq
->pm
->pm_step
, stat
, err
);
345 ide_complete_power_step(drive
, rq
, stat
, err
);
346 if (pm
->pm_step
== ide_pm_state_completed
)
347 ide_complete_pm_request(drive
, rq
);
351 spin_lock_irqsave(&ide_lock
, flags
);
352 HWGROUP(drive
)->rq
= NULL
;
354 if (unlikely(__blk_end_request(rq
, (rq
->errors
? -EIO
: 0),
357 spin_unlock_irqrestore(&ide_lock
, flags
);
360 EXPORT_SYMBOL(ide_end_drive_cmd
);
362 static void ide_kill_rq(ide_drive_t
*drive
, struct request
*rq
)
367 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
368 drv
->end_request(drive
, 0, 0);
370 ide_end_request(drive
, 0, 0);
373 static ide_startstop_t
ide_ata_error(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 err
)
375 ide_hwif_t
*hwif
= drive
->hwif
;
377 if ((stat
& ATA_BUSY
) || ((stat
& ATA_DF
) && !drive
->nowerr
)) {
378 /* other bits are useless when BUSY */
379 rq
->errors
|= ERROR_RESET
;
380 } else if (stat
& ATA_ERR
) {
381 /* err has different meaning on cdrom and tape */
382 if (err
== ATA_ABORTED
) {
383 if (drive
->select
.b
.lba
&&
384 /* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */
385 hwif
->tp_ops
->read_status(hwif
) == ATA_CMD_INIT_DEV_PARAMS
)
387 } else if ((err
& BAD_CRC
) == BAD_CRC
) {
388 /* UDMA crc error, just retry the operation */
390 } else if (err
& (ATA_BBK
| ATA_UNC
)) {
391 /* retries won't help these */
392 rq
->errors
= ERROR_MAX
;
393 } else if (err
& ATA_TRK0NF
) {
394 /* help it find track zero */
395 rq
->errors
|= ERROR_RECAL
;
399 if ((stat
& ATA_DRQ
) && rq_data_dir(rq
) == READ
&&
400 (hwif
->host_flags
& IDE_HFLAG_ERROR_STOPS_FIFO
) == 0) {
401 int nsect
= drive
->mult_count
? drive
->mult_count
: 1;
403 ide_pad_transfer(drive
, READ
, nsect
* SECTOR_SIZE
);
406 if (rq
->errors
>= ERROR_MAX
|| blk_noretry_request(rq
)) {
407 ide_kill_rq(drive
, rq
);
411 if (hwif
->tp_ops
->read_status(hwif
) & (ATA_BUSY
| ATA_DRQ
))
412 rq
->errors
|= ERROR_RESET
;
414 if ((rq
->errors
& ERROR_RESET
) == ERROR_RESET
) {
416 return ide_do_reset(drive
);
419 if ((rq
->errors
& ERROR_RECAL
) == ERROR_RECAL
)
420 drive
->special
.b
.recalibrate
= 1;
427 static ide_startstop_t
ide_atapi_error(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 err
)
429 ide_hwif_t
*hwif
= drive
->hwif
;
431 if ((stat
& ATA_BUSY
) || ((stat
& ATA_DF
) && !drive
->nowerr
)) {
432 /* other bits are useless when BUSY */
433 rq
->errors
|= ERROR_RESET
;
435 /* add decoding error stuff */
438 if (hwif
->tp_ops
->read_status(hwif
) & (ATA_BUSY
| ATA_DRQ
))
440 hwif
->tp_ops
->exec_command(hwif
, ATA_CMD_IDLEIMMEDIATE
);
442 if (rq
->errors
>= ERROR_MAX
) {
443 ide_kill_rq(drive
, rq
);
445 if ((rq
->errors
& ERROR_RESET
) == ERROR_RESET
) {
447 return ide_do_reset(drive
);
456 __ide_error(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 err
)
458 if (drive
->media
== ide_disk
)
459 return ide_ata_error(drive
, rq
, stat
, err
);
460 return ide_atapi_error(drive
, rq
, stat
, err
);
463 EXPORT_SYMBOL_GPL(__ide_error
);
466 * ide_error - handle an error on the IDE
467 * @drive: drive the error occurred on
468 * @msg: message to report
471 * ide_error() takes action based on the error returned by the drive.
472 * For normal I/O that may well include retries. We deal with
473 * both new-style (taskfile) and old style command handling here.
474 * In the case of taskfile command handling there is work left to
478 ide_startstop_t
ide_error (ide_drive_t
*drive
, const char *msg
, u8 stat
)
483 err
= ide_dump_status(drive
, msg
, stat
);
485 if ((rq
= HWGROUP(drive
)->rq
) == NULL
)
488 /* retry only "normal" I/O: */
489 if (!blk_fs_request(rq
)) {
491 ide_end_drive_cmd(drive
, stat
, err
);
498 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
499 return drv
->error(drive
, rq
, stat
, err
);
501 return __ide_error(drive
, rq
, stat
, err
);
504 EXPORT_SYMBOL_GPL(ide_error
);
506 static void ide_tf_set_specify_cmd(ide_drive_t
*drive
, struct ide_taskfile
*tf
)
508 tf
->nsect
= drive
->sect
;
509 tf
->lbal
= drive
->sect
;
510 tf
->lbam
= drive
->cyl
;
511 tf
->lbah
= drive
->cyl
>> 8;
512 tf
->device
= ((drive
->head
- 1) | drive
->select
.all
) & ~ATA_LBA
;
513 tf
->command
= ATA_CMD_INIT_DEV_PARAMS
;
516 static void ide_tf_set_restore_cmd(ide_drive_t
*drive
, struct ide_taskfile
*tf
)
518 tf
->nsect
= drive
->sect
;
519 tf
->command
= ATA_CMD_RESTORE
;
522 static void ide_tf_set_setmult_cmd(ide_drive_t
*drive
, struct ide_taskfile
*tf
)
524 tf
->nsect
= drive
->mult_req
;
525 tf
->command
= ATA_CMD_SET_MULTI
;
528 static ide_startstop_t
ide_disk_special(ide_drive_t
*drive
)
530 special_t
*s
= &drive
->special
;
533 memset(&args
, 0, sizeof(ide_task_t
));
534 args
.data_phase
= TASKFILE_NO_DATA
;
536 if (s
->b
.set_geometry
) {
537 s
->b
.set_geometry
= 0;
538 ide_tf_set_specify_cmd(drive
, &args
.tf
);
539 } else if (s
->b
.recalibrate
) {
540 s
->b
.recalibrate
= 0;
541 ide_tf_set_restore_cmd(drive
, &args
.tf
);
542 } else if (s
->b
.set_multmode
) {
543 s
->b
.set_multmode
= 0;
544 ide_tf_set_setmult_cmd(drive
, &args
.tf
);
546 int special
= s
->all
;
548 printk(KERN_ERR
"%s: bad special flag: 0x%02x\n", drive
->name
, special
);
552 args
.tf_flags
= IDE_TFLAG_TF
| IDE_TFLAG_DEVICE
|
553 IDE_TFLAG_CUSTOM_HANDLER
;
555 do_rw_taskfile(drive
, &args
);
561 * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away
563 static int set_pio_mode_abuse(ide_hwif_t
*hwif
, u8 req_pio
)
572 return (hwif
->host_flags
& IDE_HFLAG_ABUSE_DMA_MODES
) ? 1 : 0;
575 return (hwif
->host_flags
& IDE_HFLAG_ABUSE_PREFETCH
) ? 1 : 0;
578 return (hwif
->host_flags
& IDE_HFLAG_ABUSE_FAST_DEVSEL
) ? 1 : 0;
585 * do_special - issue some special commands
586 * @drive: drive the command is for
588 * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS,
589 * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive.
591 * It used to do much more, but has been scaled back.
594 static ide_startstop_t
do_special (ide_drive_t
*drive
)
596 special_t
*s
= &drive
->special
;
599 printk("%s: do_special: 0x%02x\n", drive
->name
, s
->all
);
602 ide_hwif_t
*hwif
= drive
->hwif
;
603 const struct ide_port_ops
*port_ops
= hwif
->port_ops
;
604 u8 req_pio
= drive
->tune_req
;
608 if (set_pio_mode_abuse(drive
->hwif
, req_pio
)) {
610 * take ide_lock for drive->[no_]unmask/[no_]io_32bit
612 if (req_pio
== 8 || req_pio
== 9) {
615 spin_lock_irqsave(&ide_lock
, flags
);
616 port_ops
->set_pio_mode(drive
, req_pio
);
617 spin_unlock_irqrestore(&ide_lock
, flags
);
619 port_ops
->set_pio_mode(drive
, req_pio
);
621 int keep_dma
= drive
->using_dma
;
623 ide_set_pio(drive
, req_pio
);
625 if (hwif
->host_flags
& IDE_HFLAG_SET_PIO_MODE_KEEP_DMA
) {
633 if (drive
->media
== ide_disk
)
634 return ide_disk_special(drive
);
642 void ide_map_sg(ide_drive_t
*drive
, struct request
*rq
)
644 ide_hwif_t
*hwif
= drive
->hwif
;
645 struct scatterlist
*sg
= hwif
->sg_table
;
647 if (hwif
->sg_mapped
) /* needed by ide-scsi */
650 if (rq
->cmd_type
!= REQ_TYPE_ATA_TASKFILE
) {
651 hwif
->sg_nents
= blk_rq_map_sg(drive
->queue
, rq
, sg
);
653 sg_init_one(sg
, rq
->buffer
, rq
->nr_sectors
* SECTOR_SIZE
);
658 EXPORT_SYMBOL_GPL(ide_map_sg
);
660 void ide_init_sg_cmd(ide_drive_t
*drive
, struct request
*rq
)
662 ide_hwif_t
*hwif
= drive
->hwif
;
664 hwif
->nsect
= hwif
->nleft
= rq
->nr_sectors
;
669 EXPORT_SYMBOL_GPL(ide_init_sg_cmd
);
672 * execute_drive_command - issue special drive command
673 * @drive: the drive to issue the command on
674 * @rq: the request structure holding the command
676 * execute_drive_cmd() issues a special drive command, usually
677 * initiated by ioctl() from the external hdparm program. The
678 * command can be a drive command, drive task or taskfile
679 * operation. Weirdly you can call it with NULL to wait for
680 * all commands to finish. Don't do this as that is due to change
683 static ide_startstop_t
execute_drive_cmd (ide_drive_t
*drive
,
686 ide_hwif_t
*hwif
= HWIF(drive
);
687 ide_task_t
*task
= rq
->special
;
690 hwif
->data_phase
= task
->data_phase
;
692 switch (hwif
->data_phase
) {
693 case TASKFILE_MULTI_OUT
:
695 case TASKFILE_MULTI_IN
:
697 ide_init_sg_cmd(drive
, rq
);
698 ide_map_sg(drive
, rq
);
703 return do_rw_taskfile(drive
, task
);
707 * NULL is actually a valid way of waiting for
708 * all current requests to be flushed from the queue.
711 printk("%s: DRIVE_CMD (null)\n", drive
->name
);
713 ide_end_drive_cmd(drive
, hwif
->tp_ops
->read_status(hwif
),
714 ide_read_error(drive
));
719 static ide_startstop_t
ide_special_rq(ide_drive_t
*drive
, struct request
*rq
)
721 switch (rq
->cmd
[0]) {
722 case REQ_DRIVE_RESET
:
723 return ide_do_reset(drive
);
725 blk_dump_rq_flags(rq
, "ide_special_rq - bad request");
726 ide_end_request(drive
, 0, 0);
731 static void ide_check_pm_state(ide_drive_t
*drive
, struct request
*rq
)
733 struct request_pm_state
*pm
= rq
->data
;
735 if (blk_pm_suspend_request(rq
) &&
736 pm
->pm_step
== ide_pm_state_start_suspend
)
737 /* Mark drive blocked when starting the suspend sequence. */
739 else if (blk_pm_resume_request(rq
) &&
740 pm
->pm_step
== ide_pm_state_start_resume
) {
742 * The first thing we do on wakeup is to wait for BSY bit to
743 * go away (with a looong timeout) as a drive on this hwif may
744 * just be POSTing itself.
745 * We do that before even selecting as the "other" device on
746 * the bus may be broken enough to walk on our toes at this
749 ide_hwif_t
*hwif
= drive
->hwif
;
752 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive
->name
);
754 rc
= ide_wait_not_busy(hwif
, 35000);
756 printk(KERN_WARNING
"%s: bus not ready on wakeup\n", drive
->name
);
758 hwif
->tp_ops
->set_irq(hwif
, 1);
759 rc
= ide_wait_not_busy(hwif
, 100000);
761 printk(KERN_WARNING
"%s: drive not ready on wakeup\n", drive
->name
);
766 * start_request - start of I/O and command issuing for IDE
768 * start_request() initiates handling of a new I/O request. It
769 * accepts commands and I/O (read/write) requests.
771 * FIXME: this function needs a rename
774 static ide_startstop_t
start_request (ide_drive_t
*drive
, struct request
*rq
)
776 ide_startstop_t startstop
;
778 BUG_ON(!blk_rq_started(rq
));
781 printk("%s: start_request: current=0x%08lx\n",
782 HWIF(drive
)->name
, (unsigned long) rq
);
785 /* bail early if we've exceeded max_failures */
786 if (drive
->max_failures
&& (drive
->failures
> drive
->max_failures
)) {
787 rq
->cmd_flags
|= REQ_FAILED
;
791 if (blk_pm_request(rq
))
792 ide_check_pm_state(drive
, rq
);
795 if (ide_wait_stat(&startstop
, drive
, drive
->ready_stat
,
796 ATA_BUSY
| ATA_DRQ
, WAIT_READY
)) {
797 printk(KERN_ERR
"%s: drive not ready for command\n", drive
->name
);
800 if (!drive
->special
.all
) {
804 * We reset the drive so we need to issue a SETFEATURES.
805 * Do it _after_ do_special() restored device parameters.
807 if (drive
->current_speed
== 0xff)
808 ide_config_drive_speed(drive
, drive
->desired_speed
);
810 if (rq
->cmd_type
== REQ_TYPE_ATA_TASKFILE
)
811 return execute_drive_cmd(drive
, rq
);
812 else if (blk_pm_request(rq
)) {
813 struct request_pm_state
*pm
= rq
->data
;
815 printk("%s: start_power_step(step: %d)\n",
816 drive
->name
, rq
->pm
->pm_step
);
818 startstop
= ide_start_power_step(drive
, rq
);
819 if (startstop
== ide_stopped
&&
820 pm
->pm_step
== ide_pm_state_completed
)
821 ide_complete_pm_request(drive
, rq
);
823 } else if (!rq
->rq_disk
&& blk_special_request(rq
))
825 * TODO: Once all ULDs have been modified to
826 * check for specific op codes rather than
827 * blindly accepting any special request, the
828 * check for ->rq_disk above may be replaced
829 * by a more suitable mechanism or even
832 return ide_special_rq(drive
, rq
);
834 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
836 return drv
->do_request(drive
, rq
, rq
->sector
);
838 return do_special(drive
);
840 ide_kill_rq(drive
, rq
);
845 * ide_stall_queue - pause an IDE device
846 * @drive: drive to stall
847 * @timeout: time to stall for (jiffies)
849 * ide_stall_queue() can be used by a drive to give excess bandwidth back
850 * to the hwgroup by sleeping for timeout jiffies.
853 void ide_stall_queue (ide_drive_t
*drive
, unsigned long timeout
)
855 if (timeout
> WAIT_WORSTCASE
)
856 timeout
= WAIT_WORSTCASE
;
857 drive
->sleep
= timeout
+ jiffies
;
861 EXPORT_SYMBOL(ide_stall_queue
);
863 #define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time)
866 * choose_drive - select a drive to service
867 * @hwgroup: hardware group to select on
869 * choose_drive() selects the next drive which will be serviced.
870 * This is necessary because the IDE layer can't issue commands
871 * to both drives on the same cable, unlike SCSI.
874 static inline ide_drive_t
*choose_drive (ide_hwgroup_t
*hwgroup
)
876 ide_drive_t
*drive
, *best
;
880 drive
= hwgroup
->drive
;
883 * drive is doing pre-flush, ordered write, post-flush sequence. even
884 * though that is 3 requests, it must be seen as a single transaction.
885 * we must not preempt this drive until that is complete
887 if (blk_queue_flushing(drive
->queue
)) {
889 * small race where queue could get replugged during
890 * the 3-request flush cycle, just yank the plug since
891 * we want it to finish asap
893 blk_remove_plug(drive
->queue
);
898 if ((!drive
->sleeping
|| time_after_eq(jiffies
, drive
->sleep
))
899 && !elv_queue_empty(drive
->queue
)) {
901 || (drive
->sleeping
&& (!best
->sleeping
|| time_before(drive
->sleep
, best
->sleep
)))
902 || (!best
->sleeping
&& time_before(WAKEUP(drive
), WAKEUP(best
))))
904 if (!blk_queue_plugged(drive
->queue
))
908 } while ((drive
= drive
->next
) != hwgroup
->drive
);
909 if (best
&& best
->nice1
&& !best
->sleeping
&& best
!= hwgroup
->drive
&& best
->service_time
> WAIT_MIN_SLEEP
) {
910 long t
= (signed long)(WAKEUP(best
) - jiffies
);
911 if (t
>= WAIT_MIN_SLEEP
) {
913 * We *may* have some time to spare, but first let's see if
914 * someone can potentially benefit from our nice mood today..
919 && time_before(jiffies
- best
->service_time
, WAKEUP(drive
))
920 && time_before(WAKEUP(drive
), jiffies
+ t
))
922 ide_stall_queue(best
, min_t(long, t
, 10 * WAIT_MIN_SLEEP
));
925 } while ((drive
= drive
->next
) != best
);
932 * Issue a new request to a drive from hwgroup
933 * Caller must have already done spin_lock_irqsave(&ide_lock, ..);
935 * A hwgroup is a serialized group of IDE interfaces. Usually there is
936 * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640)
937 * may have both interfaces in a single hwgroup to "serialize" access.
938 * Or possibly multiple ISA interfaces can share a common IRQ by being grouped
939 * together into one hwgroup for serialized access.
941 * Note also that several hwgroups can end up sharing a single IRQ,
942 * possibly along with many other devices. This is especially common in
943 * PCI-based systems with off-board IDE controller cards.
945 * The IDE driver uses the single global ide_lock spinlock to protect
946 * access to the request queues, and to protect the hwgroup->busy flag.
948 * The first thread into the driver for a particular hwgroup sets the
949 * hwgroup->busy flag to indicate that this hwgroup is now active,
950 * and then initiates processing of the top request from the request queue.
952 * Other threads attempting entry notice the busy setting, and will simply
953 * queue their new requests and exit immediately. Note that hwgroup->busy
954 * remains set even when the driver is merely awaiting the next interrupt.
955 * Thus, the meaning is "this hwgroup is busy processing a request".
957 * When processing of a request completes, the completing thread or IRQ-handler
958 * will start the next request from the queue. If no more work remains,
959 * the driver will clear the hwgroup->busy flag and exit.
961 * The ide_lock (spinlock) is used to protect all access to the
962 * hwgroup->busy flag, but is otherwise not needed for most processing in
963 * the driver. This makes the driver much more friendlier to shared IRQs
964 * than previous designs, while remaining 100% (?) SMP safe and capable.
966 static void ide_do_request (ide_hwgroup_t
*hwgroup
, int masked_irq
)
971 ide_startstop_t startstop
;
974 /* for atari only: POSSIBLY BROKEN HERE(?) */
975 ide_get_lock(ide_intr
, hwgroup
);
977 /* caller must own ide_lock */
978 BUG_ON(!irqs_disabled());
980 while (!hwgroup
->busy
) {
982 drive
= choose_drive(hwgroup
);
985 unsigned long sleep
= 0; /* shut up, gcc */
987 drive
= hwgroup
->drive
;
989 if (drive
->sleeping
&& (!sleeping
|| time_before(drive
->sleep
, sleep
))) {
991 sleep
= drive
->sleep
;
993 } while ((drive
= drive
->next
) != hwgroup
->drive
);
996 * Take a short snooze, and then wake up this hwgroup again.
997 * This gives other hwgroups on the same a chance to
998 * play fairly with us, just in case there are big differences
999 * in relative throughputs.. don't want to hog the cpu too much.
1001 if (time_before(sleep
, jiffies
+ WAIT_MIN_SLEEP
))
1002 sleep
= jiffies
+ WAIT_MIN_SLEEP
;
1004 if (timer_pending(&hwgroup
->timer
))
1005 printk(KERN_CRIT
"ide_set_handler: timer already active\n");
1007 /* so that ide_timer_expiry knows what to do */
1008 hwgroup
->sleeping
= 1;
1009 hwgroup
->req_gen_timer
= hwgroup
->req_gen
;
1010 mod_timer(&hwgroup
->timer
, sleep
);
1011 /* we purposely leave hwgroup->busy==1
1014 /* Ugly, but how can we sleep for the lock
1015 * otherwise? perhaps from tq_disk?
1018 /* for atari only */
1023 /* no more work for this hwgroup (for now) */
1028 if (hwgroup
->hwif
->sharing_irq
&& hwif
!= hwgroup
->hwif
) {
1030 * set nIEN for previous hwif, drives in the
1031 * quirk_list may not like intr setups/cleanups
1033 if (drive
->quirk_list
!= 1)
1034 hwif
->tp_ops
->set_irq(hwif
, 0);
1036 hwgroup
->hwif
= hwif
;
1037 hwgroup
->drive
= drive
;
1038 drive
->sleeping
= 0;
1039 drive
->service_start
= jiffies
;
1041 if (blk_queue_plugged(drive
->queue
)) {
1042 printk(KERN_ERR
"ide: huh? queue was plugged!\n");
1047 * we know that the queue isn't empty, but this can happen
1048 * if the q->prep_rq_fn() decides to kill a request
1050 rq
= elv_next_request(drive
->queue
);
1057 * Sanity: don't accept a request that isn't a PM request
1058 * if we are currently power managed. This is very important as
1059 * blk_stop_queue() doesn't prevent the elv_next_request()
1060 * above to return us whatever is in the queue. Since we call
1061 * ide_do_request() ourselves, we end up taking requests while
1062 * the queue is blocked...
1064 * We let requests forced at head of queue with ide-preempt
1065 * though. I hope that doesn't happen too much, hopefully not
1066 * unless the subdriver triggers such a thing in its own PM
1069 * We count how many times we loop here to make sure we service
1070 * all drives in the hwgroup without looping for ever
1072 if (drive
->blocked
&& !blk_pm_request(rq
) && !(rq
->cmd_flags
& REQ_PREEMPT
)) {
1073 drive
= drive
->next
? drive
->next
: hwgroup
->drive
;
1074 if (loops
++ < 4 && !blk_queue_plugged(drive
->queue
))
1076 /* We clear busy, there should be no pending ATA command at this point. */
1084 * Some systems have trouble with IDE IRQs arriving while
1085 * the driver is still setting things up. So, here we disable
1086 * the IRQ used by this interface while the request is being started.
1087 * This may look bad at first, but pretty much the same thing
1088 * happens anyway when any interrupt comes in, IDE or otherwise
1089 * -- the kernel masks the IRQ while it is being handled.
1091 if (masked_irq
!= IDE_NO_IRQ
&& hwif
->irq
!= masked_irq
)
1092 disable_irq_nosync(hwif
->irq
);
1093 spin_unlock(&ide_lock
);
1094 local_irq_enable_in_hardirq();
1095 /* allow other IRQs while we start this request */
1096 startstop
= start_request(drive
, rq
);
1097 spin_lock_irq(&ide_lock
);
1098 if (masked_irq
!= IDE_NO_IRQ
&& hwif
->irq
!= masked_irq
)
1099 enable_irq(hwif
->irq
);
1100 if (startstop
== ide_stopped
)
1106 * Passes the stuff to ide_do_request
1108 void do_ide_request(struct request_queue
*q
)
1110 ide_drive_t
*drive
= q
->queuedata
;
1112 ide_do_request(HWGROUP(drive
), IDE_NO_IRQ
);
1116 * un-busy the hwgroup etc, and clear any pending DMA status. we want to
1117 * retry the current request in pio mode instead of risking tossing it
1120 static ide_startstop_t
ide_dma_timeout_retry(ide_drive_t
*drive
, int error
)
1122 ide_hwif_t
*hwif
= HWIF(drive
);
1124 ide_startstop_t ret
= ide_stopped
;
1127 * end current dma transaction
1131 printk(KERN_WARNING
"%s: DMA timeout error\n", drive
->name
);
1132 (void)hwif
->dma_ops
->dma_end(drive
);
1133 ret
= ide_error(drive
, "dma timeout error",
1134 hwif
->tp_ops
->read_status(hwif
));
1136 printk(KERN_WARNING
"%s: DMA timeout retry\n", drive
->name
);
1137 hwif
->dma_ops
->dma_timeout(drive
);
1141 * disable dma for now, but remember that we did so because of
1142 * a timeout -- we'll reenable after we finish this next request
1143 * (or rather the first chunk of it) in pio.
1146 drive
->state
= DMA_PIO_RETRY
;
1147 ide_dma_off_quietly(drive
);
1150 * un-busy drive etc (hwgroup->busy is cleared on return) and
1151 * make sure request is sane
1153 rq
= HWGROUP(drive
)->rq
;
1158 HWGROUP(drive
)->rq
= NULL
;
1165 rq
->sector
= rq
->bio
->bi_sector
;
1166 rq
->current_nr_sectors
= bio_iovec(rq
->bio
)->bv_len
>> 9;
1167 rq
->hard_cur_sectors
= rq
->current_nr_sectors
;
1168 rq
->buffer
= bio_data(rq
->bio
);
1174 * ide_timer_expiry - handle lack of an IDE interrupt
1175 * @data: timer callback magic (hwgroup)
1177 * An IDE command has timed out before the expected drive return
1178 * occurred. At this point we attempt to clean up the current
1179 * mess. If the current handler includes an expiry handler then
1180 * we invoke the expiry handler, and providing it is happy the
1181 * work is done. If that fails we apply generic recovery rules
1182 * invoking the handler and checking the drive DMA status. We
1183 * have an excessively incestuous relationship with the DMA
1184 * logic that wants cleaning up.
1187 void ide_timer_expiry (unsigned long data
)
1189 ide_hwgroup_t
*hwgroup
= (ide_hwgroup_t
*) data
;
1190 ide_handler_t
*handler
;
1191 ide_expiry_t
*expiry
;
1192 unsigned long flags
;
1193 unsigned long wait
= -1;
1195 spin_lock_irqsave(&ide_lock
, flags
);
1197 if (((handler
= hwgroup
->handler
) == NULL
) ||
1198 (hwgroup
->req_gen
!= hwgroup
->req_gen_timer
)) {
1200 * Either a marginal timeout occurred
1201 * (got the interrupt just as timer expired),
1202 * or we were "sleeping" to give other devices a chance.
1203 * Either way, we don't really want to complain about anything.
1205 if (hwgroup
->sleeping
) {
1206 hwgroup
->sleeping
= 0;
1210 ide_drive_t
*drive
= hwgroup
->drive
;
1212 printk(KERN_ERR
"ide_timer_expiry: hwgroup->drive was NULL\n");
1213 hwgroup
->handler
= NULL
;
1216 ide_startstop_t startstop
= ide_stopped
;
1217 if (!hwgroup
->busy
) {
1218 hwgroup
->busy
= 1; /* paranoia */
1219 printk(KERN_ERR
"%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive
->name
);
1221 if ((expiry
= hwgroup
->expiry
) != NULL
) {
1223 if ((wait
= expiry(drive
)) > 0) {
1225 hwgroup
->timer
.expires
= jiffies
+ wait
;
1226 hwgroup
->req_gen_timer
= hwgroup
->req_gen
;
1227 add_timer(&hwgroup
->timer
);
1228 spin_unlock_irqrestore(&ide_lock
, flags
);
1232 hwgroup
->handler
= NULL
;
1234 * We need to simulate a real interrupt when invoking
1235 * the handler() function, which means we need to
1236 * globally mask the specific IRQ:
1238 spin_unlock(&ide_lock
);
1240 /* disable_irq_nosync ?? */
1241 disable_irq(hwif
->irq
);
1243 * as if we were handling an interrupt */
1244 local_irq_disable();
1245 if (hwgroup
->polling
) {
1246 startstop
= handler(drive
);
1247 } else if (drive_is_ready(drive
)) {
1248 if (drive
->waiting_for_dma
)
1249 hwif
->dma_ops
->dma_lost_irq(drive
);
1250 (void)ide_ack_intr(hwif
);
1251 printk(KERN_WARNING
"%s: lost interrupt\n", drive
->name
);
1252 startstop
= handler(drive
);
1254 if (drive
->waiting_for_dma
) {
1255 startstop
= ide_dma_timeout_retry(drive
, wait
);
1258 ide_error(drive
, "irq timeout",
1259 hwif
->tp_ops
->read_status(hwif
));
1261 drive
->service_time
= jiffies
- drive
->service_start
;
1262 spin_lock_irq(&ide_lock
);
1263 enable_irq(hwif
->irq
);
1264 if (startstop
== ide_stopped
)
1268 ide_do_request(hwgroup
, IDE_NO_IRQ
);
1269 spin_unlock_irqrestore(&ide_lock
, flags
);
1273 * unexpected_intr - handle an unexpected IDE interrupt
1274 * @irq: interrupt line
1275 * @hwgroup: hwgroup being processed
1277 * There's nothing really useful we can do with an unexpected interrupt,
1278 * other than reading the status register (to clear it), and logging it.
1279 * There should be no way that an irq can happen before we're ready for it,
1280 * so we needn't worry much about losing an "important" interrupt here.
1282 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever
1283 * the drive enters "idle", "standby", or "sleep" mode, so if the status
1284 * looks "good", we just ignore the interrupt completely.
1286 * This routine assumes __cli() is in effect when called.
1288 * If an unexpected interrupt happens on irq15 while we are handling irq14
1289 * and if the two interfaces are "serialized" (CMD640), then it looks like
1290 * we could screw up by interfering with a new request being set up for
1293 * In reality, this is a non-issue. The new command is not sent unless
1294 * the drive is ready to accept one, in which case we know the drive is
1295 * not trying to interrupt us. And ide_set_handler() is always invoked
1296 * before completing the issuance of any new drive command, so we will not
1297 * be accidentally invoked as a result of any valid command completion
1300 * Note that we must walk the entire hwgroup here. We know which hwif
1301 * is doing the current command, but we don't know which hwif burped
1305 static void unexpected_intr (int irq
, ide_hwgroup_t
*hwgroup
)
1308 ide_hwif_t
*hwif
= hwgroup
->hwif
;
1311 * handle the unexpected interrupt
1314 if (hwif
->irq
== irq
) {
1315 stat
= hwif
->tp_ops
->read_status(hwif
);
1317 if (!OK_STAT(stat
, ATA_DRDY
, BAD_STAT
)) {
1318 /* Try to not flood the console with msgs */
1319 static unsigned long last_msgtime
, count
;
1321 if (time_after(jiffies
, last_msgtime
+ HZ
)) {
1322 last_msgtime
= jiffies
;
1323 printk(KERN_ERR
"%s%s: unexpected interrupt, "
1324 "status=0x%02x, count=%ld\n",
1326 (hwif
->next
==hwgroup
->hwif
) ? "" : "(?)", stat
, count
);
1330 } while ((hwif
= hwif
->next
) != hwgroup
->hwif
);
1334 * ide_intr - default IDE interrupt handler
1335 * @irq: interrupt number
1336 * @dev_id: hwif group
1337 * @regs: unused weirdness from the kernel irq layer
1339 * This is the default IRQ handler for the IDE layer. You should
1340 * not need to override it. If you do be aware it is subtle in
1343 * hwgroup->hwif is the interface in the group currently performing
1344 * a command. hwgroup->drive is the drive and hwgroup->handler is
1345 * the IRQ handler to call. As we issue a command the handlers
1346 * step through multiple states, reassigning the handler to the
1347 * next step in the process. Unlike a smart SCSI controller IDE
1348 * expects the main processor to sequence the various transfer
1349 * stages. We also manage a poll timer to catch up with most
1350 * timeout situations. There are still a few where the handlers
1351 * don't ever decide to give up.
1353 * The handler eventually returns ide_stopped to indicate the
1354 * request completed. At this point we issue the next request
1355 * on the hwgroup and the process begins again.
1358 irqreturn_t
ide_intr (int irq
, void *dev_id
)
1360 unsigned long flags
;
1361 ide_hwgroup_t
*hwgroup
= (ide_hwgroup_t
*)dev_id
;
1364 ide_handler_t
*handler
;
1365 ide_startstop_t startstop
;
1367 spin_lock_irqsave(&ide_lock
, flags
);
1368 hwif
= hwgroup
->hwif
;
1370 if (!ide_ack_intr(hwif
)) {
1371 spin_unlock_irqrestore(&ide_lock
, flags
);
1375 if ((handler
= hwgroup
->handler
) == NULL
|| hwgroup
->polling
) {
1377 * Not expecting an interrupt from this drive.
1378 * That means this could be:
1379 * (1) an interrupt from another PCI device
1380 * sharing the same PCI INT# as us.
1381 * or (2) a drive just entered sleep or standby mode,
1382 * and is interrupting to let us know.
1383 * or (3) a spurious interrupt of unknown origin.
1385 * For PCI, we cannot tell the difference,
1386 * so in that case we just ignore it and hope it goes away.
1388 * FIXME: unexpected_intr should be hwif-> then we can
1389 * remove all the ifdef PCI crap
1391 #ifdef CONFIG_BLK_DEV_IDEPCI
1392 if (hwif
->chipset
!= ide_pci
)
1393 #endif /* CONFIG_BLK_DEV_IDEPCI */
1396 * Probably not a shared PCI interrupt,
1397 * so we can safely try to do something about it:
1399 unexpected_intr(irq
, hwgroup
);
1400 #ifdef CONFIG_BLK_DEV_IDEPCI
1403 * Whack the status register, just in case
1404 * we have a leftover pending IRQ.
1406 (void)hwif
->tp_ops
->read_status(hwif
);
1407 #endif /* CONFIG_BLK_DEV_IDEPCI */
1409 spin_unlock_irqrestore(&ide_lock
, flags
);
1412 drive
= hwgroup
->drive
;
1415 * This should NEVER happen, and there isn't much
1416 * we could do about it here.
1418 * [Note - this can occur if the drive is hot unplugged]
1420 spin_unlock_irqrestore(&ide_lock
, flags
);
1423 if (!drive_is_ready(drive
)) {
1425 * This happens regularly when we share a PCI IRQ with
1426 * another device. Unfortunately, it can also happen
1427 * with some buggy drives that trigger the IRQ before
1428 * their status register is up to date. Hopefully we have
1429 * enough advance overhead that the latter isn't a problem.
1431 spin_unlock_irqrestore(&ide_lock
, flags
);
1434 if (!hwgroup
->busy
) {
1435 hwgroup
->busy
= 1; /* paranoia */
1436 printk(KERN_ERR
"%s: ide_intr: hwgroup->busy was 0 ??\n", drive
->name
);
1438 hwgroup
->handler
= NULL
;
1440 del_timer(&hwgroup
->timer
);
1441 spin_unlock(&ide_lock
);
1443 /* Some controllers might set DMA INTR no matter DMA or PIO;
1444 * bmdma status might need to be cleared even for
1445 * PIO interrupts to prevent spurious/lost irq.
1447 if (hwif
->ide_dma_clear_irq
&& !(drive
->waiting_for_dma
))
1448 /* ide_dma_end() needs bmdma status for error checking.
1449 * So, skip clearing bmdma status here and leave it
1450 * to ide_dma_end() if this is dma interrupt.
1452 hwif
->ide_dma_clear_irq(drive
);
1455 local_irq_enable_in_hardirq();
1456 /* service this interrupt, may set handler for next interrupt */
1457 startstop
= handler(drive
);
1458 spin_lock_irq(&ide_lock
);
1461 * Note that handler() may have set things up for another
1462 * interrupt to occur soon, but it cannot happen until
1463 * we exit from this routine, because it will be the
1464 * same irq as is currently being serviced here, and Linux
1465 * won't allow another of the same (on any CPU) until we return.
1467 drive
->service_time
= jiffies
- drive
->service_start
;
1468 if (startstop
== ide_stopped
) {
1469 if (hwgroup
->handler
== NULL
) { /* paranoia */
1471 ide_do_request(hwgroup
, hwif
->irq
);
1473 printk(KERN_ERR
"%s: ide_intr: huh? expected NULL handler "
1474 "on exit\n", drive
->name
);
1477 spin_unlock_irqrestore(&ide_lock
, flags
);
1482 * ide_do_drive_cmd - issue IDE special command
1483 * @drive: device to issue command
1484 * @rq: request to issue
1486 * This function issues a special IDE device request
1487 * onto the request queue.
1489 * the rq is queued at the head of the request queue, displacing
1490 * the currently-being-processed request and this function
1491 * returns immediately without waiting for the new rq to be
1492 * completed. This is VERY DANGEROUS, and is intended for
1493 * careful use by the ATAPI tape/cdrom driver code.
1496 void ide_do_drive_cmd(ide_drive_t
*drive
, struct request
*rq
)
1498 unsigned long flags
;
1499 ide_hwgroup_t
*hwgroup
= HWGROUP(drive
);
1501 spin_lock_irqsave(&ide_lock
, flags
);
1503 __elv_add_request(drive
->queue
, rq
, ELEVATOR_INSERT_FRONT
, 1);
1504 __generic_unplug_device(drive
->queue
);
1505 spin_unlock_irqrestore(&ide_lock
, flags
);
1508 EXPORT_SYMBOL(ide_do_drive_cmd
);
1510 void ide_pktcmd_tf_load(ide_drive_t
*drive
, u32 tf_flags
, u16 bcount
, u8 dma
)
1512 ide_hwif_t
*hwif
= drive
->hwif
;
1515 memset(&task
, 0, sizeof(task
));
1516 task
.tf_flags
= IDE_TFLAG_OUT_LBAH
| IDE_TFLAG_OUT_LBAM
|
1517 IDE_TFLAG_OUT_FEATURE
| tf_flags
;
1518 task
.tf
.feature
= dma
; /* Use PIO/DMA */
1519 task
.tf
.lbam
= bcount
& 0xff;
1520 task
.tf
.lbah
= (bcount
>> 8) & 0xff;
1522 ide_tf_dump(drive
->name
, &task
.tf
);
1523 hwif
->tp_ops
->set_irq(hwif
, 1);
1524 SELECT_MASK(drive
, 0);
1525 hwif
->tp_ops
->tf_load(drive
, &task
);
1528 EXPORT_SYMBOL_GPL(ide_pktcmd_tf_load
);
1530 void ide_pad_transfer(ide_drive_t
*drive
, int write
, int len
)
1532 ide_hwif_t
*hwif
= drive
->hwif
;
1537 hwif
->tp_ops
->output_data(drive
, NULL
, buf
, min(4, len
));
1539 hwif
->tp_ops
->input_data(drive
, NULL
, buf
, min(4, len
));
1543 EXPORT_SYMBOL_GPL(ide_pad_transfer
);