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/completion.h>
44 #include <linux/reboot.h>
45 #include <linux/cdrom.h>
46 #include <linux/seq_file.h>
47 #include <linux/device.h>
48 #include <linux/kmod.h>
49 #include <linux/scatterlist.h>
50 #include <linux/bitops.h>
52 #include <asm/byteorder.h>
54 #include <asm/uaccess.h>
57 static int __ide_end_request(ide_drive_t
*drive
, struct request
*rq
,
58 int uptodate
, unsigned int nr_bytes
, int dequeue
)
64 error
= uptodate
? uptodate
: -EIO
;
67 * if failfast is set on a request, override number of sectors and
68 * complete the whole request right now
70 if (blk_noretry_request(rq
) && error
)
71 nr_bytes
= rq
->hard_nr_sectors
<< 9;
73 if (!blk_fs_request(rq
) && error
&& !rq
->errors
)
77 * decide whether to reenable DMA -- 3 is a random magic for now,
78 * if we DMA timeout more than 3 times, just stay in PIO
80 if (drive
->state
== DMA_PIO_RETRY
&& drive
->retry_pio
<= 3) {
85 if (!__blk_end_request(rq
, error
, nr_bytes
)) {
87 HWGROUP(drive
)->rq
= NULL
;
95 * ide_end_request - complete an IDE I/O
96 * @drive: IDE device for the I/O
98 * @nr_sectors: number of sectors completed
100 * This is our end_request wrapper function. We complete the I/O
101 * update random number input and dequeue the request, which if
102 * it was tagged may be out of order.
105 int ide_end_request (ide_drive_t
*drive
, int uptodate
, int nr_sectors
)
107 unsigned int nr_bytes
= nr_sectors
<< 9;
113 * room for locking improvements here, the calls below don't
114 * need the queue lock held at all
116 spin_lock_irqsave(&ide_lock
, flags
);
117 rq
= HWGROUP(drive
)->rq
;
120 if (blk_pc_request(rq
))
121 nr_bytes
= rq
->data_len
;
123 nr_bytes
= rq
->hard_cur_sectors
<< 9;
126 ret
= __ide_end_request(drive
, rq
, uptodate
, nr_bytes
, 1);
128 spin_unlock_irqrestore(&ide_lock
, flags
);
131 EXPORT_SYMBOL(ide_end_request
);
134 * Power Management state machine. This one is rather trivial for now,
135 * we should probably add more, like switching back to PIO on suspend
136 * to help some BIOSes, re-do the door locking on resume, etc...
140 ide_pm_flush_cache
= ide_pm_state_start_suspend
,
143 idedisk_pm_restore_pio
= ide_pm_state_start_resume
,
148 static void ide_complete_power_step(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 error
)
150 struct request_pm_state
*pm
= rq
->data
;
152 if (drive
->media
!= ide_disk
)
155 switch (pm
->pm_step
) {
156 case ide_pm_flush_cache
: /* Suspend step 1 (flush cache) complete */
157 if (pm
->pm_state
== PM_EVENT_FREEZE
)
158 pm
->pm_step
= ide_pm_state_completed
;
160 pm
->pm_step
= idedisk_pm_standby
;
162 case idedisk_pm_standby
: /* Suspend step 2 (standby) complete */
163 pm
->pm_step
= ide_pm_state_completed
;
165 case idedisk_pm_restore_pio
: /* Resume step 1 complete */
166 pm
->pm_step
= idedisk_pm_idle
;
168 case idedisk_pm_idle
: /* Resume step 2 (idle) complete */
169 pm
->pm_step
= ide_pm_restore_dma
;
174 static ide_startstop_t
ide_start_power_step(ide_drive_t
*drive
, struct request
*rq
)
176 struct request_pm_state
*pm
= rq
->data
;
177 ide_task_t
*args
= rq
->special
;
179 memset(args
, 0, sizeof(*args
));
181 switch (pm
->pm_step
) {
182 case ide_pm_flush_cache
: /* Suspend step 1 (flush cache) */
183 if (drive
->media
!= ide_disk
)
185 /* Not supported? Switch to next step now. */
186 if (!drive
->wcache
|| !ide_id_has_flush_cache(drive
->id
)) {
187 ide_complete_power_step(drive
, rq
, 0, 0);
190 if (ide_id_has_flush_cache_ext(drive
->id
))
191 args
->tf
.command
= WIN_FLUSH_CACHE_EXT
;
193 args
->tf
.command
= WIN_FLUSH_CACHE
;
196 case idedisk_pm_standby
: /* Suspend step 2 (standby) */
197 args
->tf
.command
= WIN_STANDBYNOW1
;
200 case idedisk_pm_restore_pio
: /* Resume step 1 (restore PIO) */
201 ide_set_max_pio(drive
);
203 * skip idedisk_pm_idle for ATAPI devices
205 if (drive
->media
!= ide_disk
)
206 pm
->pm_step
= ide_pm_restore_dma
;
208 ide_complete_power_step(drive
, rq
, 0, 0);
211 case idedisk_pm_idle
: /* Resume step 2 (idle) */
212 args
->tf
.command
= WIN_IDLEIMMEDIATE
;
215 case ide_pm_restore_dma
: /* Resume step 3 (restore DMA) */
217 * Right now, all we do is call ide_set_dma(drive),
218 * we could be smarter and check for current xfer_speed
219 * in struct drive etc...
221 if (drive
->hwif
->dma_ops
== NULL
)
224 * TODO: respect ->using_dma setting
229 pm
->pm_step
= ide_pm_state_completed
;
233 args
->tf_flags
= IDE_TFLAG_TF
| IDE_TFLAG_DEVICE
;
234 args
->data_phase
= TASKFILE_NO_DATA
;
235 return do_rw_taskfile(drive
, args
);
239 * ide_end_dequeued_request - complete an IDE I/O
240 * @drive: IDE device for the I/O
242 * @nr_sectors: number of sectors completed
244 * Complete an I/O that is no longer on the request queue. This
245 * typically occurs when we pull the request and issue a REQUEST_SENSE.
246 * We must still finish the old request but we must not tamper with the
247 * queue in the meantime.
249 * NOTE: This path does not handle barrier, but barrier is not supported
253 int ide_end_dequeued_request(ide_drive_t
*drive
, struct request
*rq
,
254 int uptodate
, int nr_sectors
)
259 spin_lock_irqsave(&ide_lock
, flags
);
260 BUG_ON(!blk_rq_started(rq
));
261 ret
= __ide_end_request(drive
, rq
, uptodate
, nr_sectors
<< 9, 0);
262 spin_unlock_irqrestore(&ide_lock
, flags
);
266 EXPORT_SYMBOL_GPL(ide_end_dequeued_request
);
270 * ide_complete_pm_request - end the current Power Management request
271 * @drive: target drive
274 * This function cleans up the current PM request and stops the queue
277 static void ide_complete_pm_request (ide_drive_t
*drive
, struct request
*rq
)
282 printk("%s: completing PM request, %s\n", drive
->name
,
283 blk_pm_suspend_request(rq
) ? "suspend" : "resume");
285 spin_lock_irqsave(&ide_lock
, flags
);
286 if (blk_pm_suspend_request(rq
)) {
287 blk_stop_queue(drive
->queue
);
290 blk_start_queue(drive
->queue
);
292 HWGROUP(drive
)->rq
= NULL
;
293 if (__blk_end_request(rq
, 0, 0))
295 spin_unlock_irqrestore(&ide_lock
, flags
);
299 * ide_end_drive_cmd - end an explicit drive command
304 * Clean up after success/failure of an explicit drive command.
305 * These get thrown onto the queue so they are synchronized with
306 * real I/O operations on the drive.
308 * In LBA48 mode we have to read the register set twice to get
309 * all the extra information out.
312 void ide_end_drive_cmd (ide_drive_t
*drive
, u8 stat
, u8 err
)
317 spin_lock_irqsave(&ide_lock
, flags
);
318 rq
= HWGROUP(drive
)->rq
;
319 spin_unlock_irqrestore(&ide_lock
, flags
);
321 if (rq
->cmd_type
== REQ_TYPE_ATA_TASKFILE
) {
322 ide_task_t
*task
= (ide_task_t
*)rq
->special
;
325 rq
->errors
= !OK_STAT(stat
, READY_STAT
, BAD_STAT
);
328 struct ide_taskfile
*tf
= &task
->tf
;
333 drive
->hwif
->tf_read(drive
, task
);
335 if (task
->tf_flags
& IDE_TFLAG_DYN
)
338 } else if (blk_pm_request(rq
)) {
339 struct request_pm_state
*pm
= rq
->data
;
341 printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n",
342 drive
->name
, rq
->pm
->pm_step
, stat
, err
);
344 ide_complete_power_step(drive
, rq
, stat
, err
);
345 if (pm
->pm_step
== ide_pm_state_completed
)
346 ide_complete_pm_request(drive
, rq
);
350 spin_lock_irqsave(&ide_lock
, flags
);
351 HWGROUP(drive
)->rq
= NULL
;
353 if (unlikely(__blk_end_request(rq
, (rq
->errors
? -EIO
: 0),
356 spin_unlock_irqrestore(&ide_lock
, flags
);
359 EXPORT_SYMBOL(ide_end_drive_cmd
);
361 static void ide_kill_rq(ide_drive_t
*drive
, struct request
*rq
)
366 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
367 drv
->end_request(drive
, 0, 0);
369 ide_end_request(drive
, 0, 0);
372 static ide_startstop_t
ide_ata_error(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 err
)
374 ide_hwif_t
*hwif
= drive
->hwif
;
376 if (stat
& BUSY_STAT
|| ((stat
& WRERR_STAT
) && !drive
->nowerr
)) {
377 /* other bits are useless when BUSY */
378 rq
->errors
|= ERROR_RESET
;
379 } else if (stat
& ERR_STAT
) {
380 /* err has different meaning on cdrom and tape */
381 if (err
== ABRT_ERR
) {
382 if (drive
->select
.b
.lba
&&
383 /* some newer drives don't support WIN_SPECIFY */
384 hwif
->INB(hwif
->io_ports
.command_addr
) ==
387 } else if ((err
& BAD_CRC
) == BAD_CRC
) {
388 /* UDMA crc error, just retry the operation */
390 } else if (err
& (BBD_ERR
| ECC_ERR
)) {
391 /* retries won't help these */
392 rq
->errors
= ERROR_MAX
;
393 } else if (err
& TRK0_ERR
) {
394 /* help it find track zero */
395 rq
->errors
|= ERROR_RECAL
;
399 if ((stat
& DRQ_STAT
) && 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 (ide_read_status(drive
) & (BUSY_STAT
| DRQ_STAT
))
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
& BUSY_STAT
|| ((stat
& WRERR_STAT
) && !drive
->nowerr
)) {
432 /* other bits are useless when BUSY */
433 rq
->errors
|= ERROR_RESET
;
435 /* add decoding error stuff */
438 if (ide_read_status(drive
) & (BUSY_STAT
| DRQ_STAT
))
440 hwif
->OUTBSYNC(hwif
, WIN_IDLEIMMEDIATE
,
441 hwif
->io_ports
.command_addr
);
443 if (rq
->errors
>= ERROR_MAX
) {
444 ide_kill_rq(drive
, rq
);
446 if ((rq
->errors
& ERROR_RESET
) == ERROR_RESET
) {
448 return ide_do_reset(drive
);
457 __ide_error(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 err
)
459 if (drive
->media
== ide_disk
)
460 return ide_ata_error(drive
, rq
, stat
, err
);
461 return ide_atapi_error(drive
, rq
, stat
, err
);
464 EXPORT_SYMBOL_GPL(__ide_error
);
467 * ide_error - handle an error on the IDE
468 * @drive: drive the error occurred on
469 * @msg: message to report
472 * ide_error() takes action based on the error returned by the drive.
473 * For normal I/O that may well include retries. We deal with
474 * both new-style (taskfile) and old style command handling here.
475 * In the case of taskfile command handling there is work left to
479 ide_startstop_t
ide_error (ide_drive_t
*drive
, const char *msg
, u8 stat
)
484 err
= ide_dump_status(drive
, msg
, stat
);
486 if ((rq
= HWGROUP(drive
)->rq
) == NULL
)
489 /* retry only "normal" I/O: */
490 if (!blk_fs_request(rq
)) {
492 ide_end_drive_cmd(drive
, stat
, err
);
499 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
500 return drv
->error(drive
, rq
, stat
, err
);
502 return __ide_error(drive
, rq
, stat
, err
);
505 EXPORT_SYMBOL_GPL(ide_error
);
507 ide_startstop_t
__ide_abort(ide_drive_t
*drive
, struct request
*rq
)
509 if (drive
->media
!= ide_disk
)
510 rq
->errors
|= ERROR_RESET
;
512 ide_kill_rq(drive
, rq
);
517 EXPORT_SYMBOL_GPL(__ide_abort
);
520 * ide_abort - abort pending IDE operations
521 * @drive: drive the error occurred on
522 * @msg: message to report
524 * ide_abort kills and cleans up when we are about to do a
525 * host initiated reset on active commands. Longer term we
526 * want handlers to have sensible abort handling themselves
528 * This differs fundamentally from ide_error because in
529 * this case the command is doing just fine when we
533 ide_startstop_t
ide_abort(ide_drive_t
*drive
, const char *msg
)
537 if (drive
== NULL
|| (rq
= HWGROUP(drive
)->rq
) == NULL
)
540 /* retry only "normal" I/O: */
541 if (!blk_fs_request(rq
)) {
543 ide_end_drive_cmd(drive
, BUSY_STAT
, 0);
550 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
551 return drv
->abort(drive
, rq
);
553 return __ide_abort(drive
, rq
);
556 static void ide_tf_set_specify_cmd(ide_drive_t
*drive
, struct ide_taskfile
*tf
)
558 tf
->nsect
= drive
->sect
;
559 tf
->lbal
= drive
->sect
;
560 tf
->lbam
= drive
->cyl
;
561 tf
->lbah
= drive
->cyl
>> 8;
562 tf
->device
= ((drive
->head
- 1) | drive
->select
.all
) & ~ATA_LBA
;
563 tf
->command
= WIN_SPECIFY
;
566 static void ide_tf_set_restore_cmd(ide_drive_t
*drive
, struct ide_taskfile
*tf
)
568 tf
->nsect
= drive
->sect
;
569 tf
->command
= WIN_RESTORE
;
572 static void ide_tf_set_setmult_cmd(ide_drive_t
*drive
, struct ide_taskfile
*tf
)
574 tf
->nsect
= drive
->mult_req
;
575 tf
->command
= WIN_SETMULT
;
578 static ide_startstop_t
ide_disk_special(ide_drive_t
*drive
)
580 special_t
*s
= &drive
->special
;
583 memset(&args
, 0, sizeof(ide_task_t
));
584 args
.data_phase
= TASKFILE_NO_DATA
;
586 if (s
->b
.set_geometry
) {
587 s
->b
.set_geometry
= 0;
588 ide_tf_set_specify_cmd(drive
, &args
.tf
);
589 } else if (s
->b
.recalibrate
) {
590 s
->b
.recalibrate
= 0;
591 ide_tf_set_restore_cmd(drive
, &args
.tf
);
592 } else if (s
->b
.set_multmode
) {
593 s
->b
.set_multmode
= 0;
594 if (drive
->mult_req
> drive
->id
->max_multsect
)
595 drive
->mult_req
= drive
->id
->max_multsect
;
596 ide_tf_set_setmult_cmd(drive
, &args
.tf
);
598 int special
= s
->all
;
600 printk(KERN_ERR
"%s: bad special flag: 0x%02x\n", drive
->name
, special
);
604 args
.tf_flags
= IDE_TFLAG_TF
| IDE_TFLAG_DEVICE
|
605 IDE_TFLAG_CUSTOM_HANDLER
;
607 do_rw_taskfile(drive
, &args
);
613 * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away
615 static int set_pio_mode_abuse(ide_hwif_t
*hwif
, u8 req_pio
)
624 return (hwif
->host_flags
& IDE_HFLAG_ABUSE_DMA_MODES
) ? 1 : 0;
627 return (hwif
->host_flags
& IDE_HFLAG_ABUSE_PREFETCH
) ? 1 : 0;
630 return (hwif
->host_flags
& IDE_HFLAG_ABUSE_FAST_DEVSEL
) ? 1 : 0;
637 * do_special - issue some special commands
638 * @drive: drive the command is for
640 * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
641 * commands to a drive. It used to do much more, but has been scaled
645 static ide_startstop_t
do_special (ide_drive_t
*drive
)
647 special_t
*s
= &drive
->special
;
650 printk("%s: do_special: 0x%02x\n", drive
->name
, s
->all
);
653 ide_hwif_t
*hwif
= drive
->hwif
;
654 const struct ide_port_ops
*port_ops
= hwif
->port_ops
;
655 u8 req_pio
= drive
->tune_req
;
659 if (set_pio_mode_abuse(drive
->hwif
, req_pio
)) {
661 * take ide_lock for drive->[no_]unmask/[no_]io_32bit
663 if (req_pio
== 8 || req_pio
== 9) {
666 spin_lock_irqsave(&ide_lock
, flags
);
667 port_ops
->set_pio_mode(drive
, req_pio
);
668 spin_unlock_irqrestore(&ide_lock
, flags
);
670 port_ops
->set_pio_mode(drive
, req_pio
);
672 int keep_dma
= drive
->using_dma
;
674 ide_set_pio(drive
, req_pio
);
676 if (hwif
->host_flags
& IDE_HFLAG_SET_PIO_MODE_KEEP_DMA
) {
684 if (drive
->media
== ide_disk
)
685 return ide_disk_special(drive
);
693 void ide_map_sg(ide_drive_t
*drive
, struct request
*rq
)
695 ide_hwif_t
*hwif
= drive
->hwif
;
696 struct scatterlist
*sg
= hwif
->sg_table
;
698 if (hwif
->sg_mapped
) /* needed by ide-scsi */
701 if (rq
->cmd_type
!= REQ_TYPE_ATA_TASKFILE
) {
702 hwif
->sg_nents
= blk_rq_map_sg(drive
->queue
, rq
, sg
);
704 sg_init_one(sg
, rq
->buffer
, rq
->nr_sectors
* SECTOR_SIZE
);
709 EXPORT_SYMBOL_GPL(ide_map_sg
);
711 void ide_init_sg_cmd(ide_drive_t
*drive
, struct request
*rq
)
713 ide_hwif_t
*hwif
= drive
->hwif
;
715 hwif
->nsect
= hwif
->nleft
= rq
->nr_sectors
;
720 EXPORT_SYMBOL_GPL(ide_init_sg_cmd
);
723 * execute_drive_command - issue special drive command
724 * @drive: the drive to issue the command on
725 * @rq: the request structure holding the command
727 * execute_drive_cmd() issues a special drive command, usually
728 * initiated by ioctl() from the external hdparm program. The
729 * command can be a drive command, drive task or taskfile
730 * operation. Weirdly you can call it with NULL to wait for
731 * all commands to finish. Don't do this as that is due to change
734 static ide_startstop_t
execute_drive_cmd (ide_drive_t
*drive
,
737 ide_hwif_t
*hwif
= HWIF(drive
);
738 ide_task_t
*task
= rq
->special
;
741 hwif
->data_phase
= task
->data_phase
;
743 switch (hwif
->data_phase
) {
744 case TASKFILE_MULTI_OUT
:
746 case TASKFILE_MULTI_IN
:
748 ide_init_sg_cmd(drive
, rq
);
749 ide_map_sg(drive
, rq
);
754 return do_rw_taskfile(drive
, task
);
758 * NULL is actually a valid way of waiting for
759 * all current requests to be flushed from the queue.
762 printk("%s: DRIVE_CMD (null)\n", drive
->name
);
764 ide_end_drive_cmd(drive
, ide_read_status(drive
), ide_read_error(drive
));
769 static void ide_check_pm_state(ide_drive_t
*drive
, struct request
*rq
)
771 struct request_pm_state
*pm
= rq
->data
;
773 if (blk_pm_suspend_request(rq
) &&
774 pm
->pm_step
== ide_pm_state_start_suspend
)
775 /* Mark drive blocked when starting the suspend sequence. */
777 else if (blk_pm_resume_request(rq
) &&
778 pm
->pm_step
== ide_pm_state_start_resume
) {
780 * The first thing we do on wakeup is to wait for BSY bit to
781 * go away (with a looong timeout) as a drive on this hwif may
782 * just be POSTing itself.
783 * We do that before even selecting as the "other" device on
784 * the bus may be broken enough to walk on our toes at this
789 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive
->name
);
791 rc
= ide_wait_not_busy(HWIF(drive
), 35000);
793 printk(KERN_WARNING
"%s: bus not ready on wakeup\n", drive
->name
);
795 ide_set_irq(drive
, 1);
796 rc
= ide_wait_not_busy(HWIF(drive
), 100000);
798 printk(KERN_WARNING
"%s: drive not ready on wakeup\n", drive
->name
);
803 * start_request - start of I/O and command issuing for IDE
805 * start_request() initiates handling of a new I/O request. It
806 * accepts commands and I/O (read/write) requests. It also does
807 * the final remapping for weird stuff like EZDrive. Once
808 * device mapper can work sector level the EZDrive stuff can go away
810 * FIXME: this function needs a rename
813 static ide_startstop_t
start_request (ide_drive_t
*drive
, struct request
*rq
)
815 ide_startstop_t startstop
;
818 BUG_ON(!blk_rq_started(rq
));
821 printk("%s: start_request: current=0x%08lx\n",
822 HWIF(drive
)->name
, (unsigned long) rq
);
825 /* bail early if we've exceeded max_failures */
826 if (drive
->max_failures
&& (drive
->failures
> drive
->max_failures
)) {
827 rq
->cmd_flags
|= REQ_FAILED
;
832 if (blk_fs_request(rq
) &&
833 (drive
->media
== ide_disk
|| drive
->media
== ide_floppy
)) {
834 block
+= drive
->sect0
;
836 /* Yecch - this will shift the entire interval,
837 possibly killing some innocent following sector */
838 if (block
== 0 && drive
->remap_0_to_1
== 1)
839 block
= 1; /* redirect MBR access to EZ-Drive partn table */
841 if (blk_pm_request(rq
))
842 ide_check_pm_state(drive
, rq
);
845 if (ide_wait_stat(&startstop
, drive
, drive
->ready_stat
, BUSY_STAT
|DRQ_STAT
, WAIT_READY
)) {
846 printk(KERN_ERR
"%s: drive not ready for command\n", drive
->name
);
849 if (!drive
->special
.all
) {
853 * We reset the drive so we need to issue a SETFEATURES.
854 * Do it _after_ do_special() restored device parameters.
856 if (drive
->current_speed
== 0xff)
857 ide_config_drive_speed(drive
, drive
->desired_speed
);
859 if (rq
->cmd_type
== REQ_TYPE_ATA_TASKFILE
)
860 return execute_drive_cmd(drive
, rq
);
861 else if (blk_pm_request(rq
)) {
862 struct request_pm_state
*pm
= rq
->data
;
864 printk("%s: start_power_step(step: %d)\n",
865 drive
->name
, rq
->pm
->pm_step
);
867 startstop
= ide_start_power_step(drive
, rq
);
868 if (startstop
== ide_stopped
&&
869 pm
->pm_step
== ide_pm_state_completed
)
870 ide_complete_pm_request(drive
, rq
);
874 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
875 return drv
->do_request(drive
, rq
, block
);
877 return do_special(drive
);
879 ide_kill_rq(drive
, rq
);
884 * ide_stall_queue - pause an IDE device
885 * @drive: drive to stall
886 * @timeout: time to stall for (jiffies)
888 * ide_stall_queue() can be used by a drive to give excess bandwidth back
889 * to the hwgroup by sleeping for timeout jiffies.
892 void ide_stall_queue (ide_drive_t
*drive
, unsigned long timeout
)
894 if (timeout
> WAIT_WORSTCASE
)
895 timeout
= WAIT_WORSTCASE
;
896 drive
->sleep
= timeout
+ jiffies
;
900 EXPORT_SYMBOL(ide_stall_queue
);
902 #define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time)
905 * choose_drive - select a drive to service
906 * @hwgroup: hardware group to select on
908 * choose_drive() selects the next drive which will be serviced.
909 * This is necessary because the IDE layer can't issue commands
910 * to both drives on the same cable, unlike SCSI.
913 static inline ide_drive_t
*choose_drive (ide_hwgroup_t
*hwgroup
)
915 ide_drive_t
*drive
, *best
;
919 drive
= hwgroup
->drive
;
922 * drive is doing pre-flush, ordered write, post-flush sequence. even
923 * though that is 3 requests, it must be seen as a single transaction.
924 * we must not preempt this drive until that is complete
926 if (blk_queue_flushing(drive
->queue
)) {
928 * small race where queue could get replugged during
929 * the 3-request flush cycle, just yank the plug since
930 * we want it to finish asap
932 blk_remove_plug(drive
->queue
);
937 if ((!drive
->sleeping
|| time_after_eq(jiffies
, drive
->sleep
))
938 && !elv_queue_empty(drive
->queue
)) {
940 || (drive
->sleeping
&& (!best
->sleeping
|| time_before(drive
->sleep
, best
->sleep
)))
941 || (!best
->sleeping
&& time_before(WAKEUP(drive
), WAKEUP(best
))))
943 if (!blk_queue_plugged(drive
->queue
))
947 } while ((drive
= drive
->next
) != hwgroup
->drive
);
948 if (best
&& best
->nice1
&& !best
->sleeping
&& best
!= hwgroup
->drive
&& best
->service_time
> WAIT_MIN_SLEEP
) {
949 long t
= (signed long)(WAKEUP(best
) - jiffies
);
950 if (t
>= WAIT_MIN_SLEEP
) {
952 * We *may* have some time to spare, but first let's see if
953 * someone can potentially benefit from our nice mood today..
958 && time_before(jiffies
- best
->service_time
, WAKEUP(drive
))
959 && time_before(WAKEUP(drive
), jiffies
+ t
))
961 ide_stall_queue(best
, min_t(long, t
, 10 * WAIT_MIN_SLEEP
));
964 } while ((drive
= drive
->next
) != best
);
971 * Issue a new request to a drive from hwgroup
972 * Caller must have already done spin_lock_irqsave(&ide_lock, ..);
974 * A hwgroup is a serialized group of IDE interfaces. Usually there is
975 * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640)
976 * may have both interfaces in a single hwgroup to "serialize" access.
977 * Or possibly multiple ISA interfaces can share a common IRQ by being grouped
978 * together into one hwgroup for serialized access.
980 * Note also that several hwgroups can end up sharing a single IRQ,
981 * possibly along with many other devices. This is especially common in
982 * PCI-based systems with off-board IDE controller cards.
984 * The IDE driver uses the single global ide_lock spinlock to protect
985 * access to the request queues, and to protect the hwgroup->busy flag.
987 * The first thread into the driver for a particular hwgroup sets the
988 * hwgroup->busy flag to indicate that this hwgroup is now active,
989 * and then initiates processing of the top request from the request queue.
991 * Other threads attempting entry notice the busy setting, and will simply
992 * queue their new requests and exit immediately. Note that hwgroup->busy
993 * remains set even when the driver is merely awaiting the next interrupt.
994 * Thus, the meaning is "this hwgroup is busy processing a request".
996 * When processing of a request completes, the completing thread or IRQ-handler
997 * will start the next request from the queue. If no more work remains,
998 * the driver will clear the hwgroup->busy flag and exit.
1000 * The ide_lock (spinlock) is used to protect all access to the
1001 * hwgroup->busy flag, but is otherwise not needed for most processing in
1002 * the driver. This makes the driver much more friendlier to shared IRQs
1003 * than previous designs, while remaining 100% (?) SMP safe and capable.
1005 static void ide_do_request (ide_hwgroup_t
*hwgroup
, int masked_irq
)
1010 ide_startstop_t startstop
;
1013 /* for atari only: POSSIBLY BROKEN HERE(?) */
1014 ide_get_lock(ide_intr
, hwgroup
);
1016 /* caller must own ide_lock */
1017 BUG_ON(!irqs_disabled());
1019 while (!hwgroup
->busy
) {
1021 drive
= choose_drive(hwgroup
);
1022 if (drive
== NULL
) {
1024 unsigned long sleep
= 0; /* shut up, gcc */
1026 drive
= hwgroup
->drive
;
1028 if (drive
->sleeping
&& (!sleeping
|| time_before(drive
->sleep
, sleep
))) {
1030 sleep
= drive
->sleep
;
1032 } while ((drive
= drive
->next
) != hwgroup
->drive
);
1035 * Take a short snooze, and then wake up this hwgroup again.
1036 * This gives other hwgroups on the same a chance to
1037 * play fairly with us, just in case there are big differences
1038 * in relative throughputs.. don't want to hog the cpu too much.
1040 if (time_before(sleep
, jiffies
+ WAIT_MIN_SLEEP
))
1041 sleep
= jiffies
+ WAIT_MIN_SLEEP
;
1043 if (timer_pending(&hwgroup
->timer
))
1044 printk(KERN_CRIT
"ide_set_handler: timer already active\n");
1046 /* so that ide_timer_expiry knows what to do */
1047 hwgroup
->sleeping
= 1;
1048 hwgroup
->req_gen_timer
= hwgroup
->req_gen
;
1049 mod_timer(&hwgroup
->timer
, sleep
);
1050 /* we purposely leave hwgroup->busy==1
1053 /* Ugly, but how can we sleep for the lock
1054 * otherwise? perhaps from tq_disk?
1057 /* for atari only */
1062 /* no more work for this hwgroup (for now) */
1067 if (hwgroup
->hwif
->sharing_irq
&& hwif
!= hwgroup
->hwif
) {
1069 * set nIEN for previous hwif, drives in the
1070 * quirk_list may not like intr setups/cleanups
1072 if (drive
->quirk_list
!= 1)
1073 ide_set_irq(drive
, 0);
1075 hwgroup
->hwif
= hwif
;
1076 hwgroup
->drive
= drive
;
1077 drive
->sleeping
= 0;
1078 drive
->service_start
= jiffies
;
1080 if (blk_queue_plugged(drive
->queue
)) {
1081 printk(KERN_ERR
"ide: huh? queue was plugged!\n");
1086 * we know that the queue isn't empty, but this can happen
1087 * if the q->prep_rq_fn() decides to kill a request
1089 rq
= elv_next_request(drive
->queue
);
1096 * Sanity: don't accept a request that isn't a PM request
1097 * if we are currently power managed. This is very important as
1098 * blk_stop_queue() doesn't prevent the elv_next_request()
1099 * above to return us whatever is in the queue. Since we call
1100 * ide_do_request() ourselves, we end up taking requests while
1101 * the queue is blocked...
1103 * We let requests forced at head of queue with ide-preempt
1104 * though. I hope that doesn't happen too much, hopefully not
1105 * unless the subdriver triggers such a thing in its own PM
1108 * We count how many times we loop here to make sure we service
1109 * all drives in the hwgroup without looping for ever
1111 if (drive
->blocked
&& !blk_pm_request(rq
) && !(rq
->cmd_flags
& REQ_PREEMPT
)) {
1112 drive
= drive
->next
? drive
->next
: hwgroup
->drive
;
1113 if (loops
++ < 4 && !blk_queue_plugged(drive
->queue
))
1115 /* We clear busy, there should be no pending ATA command at this point. */
1123 * Some systems have trouble with IDE IRQs arriving while
1124 * the driver is still setting things up. So, here we disable
1125 * the IRQ used by this interface while the request is being started.
1126 * This may look bad at first, but pretty much the same thing
1127 * happens anyway when any interrupt comes in, IDE or otherwise
1128 * -- the kernel masks the IRQ while it is being handled.
1130 if (masked_irq
!= IDE_NO_IRQ
&& hwif
->irq
!= masked_irq
)
1131 disable_irq_nosync(hwif
->irq
);
1132 spin_unlock(&ide_lock
);
1133 local_irq_enable_in_hardirq();
1134 /* allow other IRQs while we start this request */
1135 startstop
= start_request(drive
, rq
);
1136 spin_lock_irq(&ide_lock
);
1137 if (masked_irq
!= IDE_NO_IRQ
&& hwif
->irq
!= masked_irq
)
1138 enable_irq(hwif
->irq
);
1139 if (startstop
== ide_stopped
)
1145 * Passes the stuff to ide_do_request
1147 void do_ide_request(struct request_queue
*q
)
1149 ide_drive_t
*drive
= q
->queuedata
;
1151 ide_do_request(HWGROUP(drive
), IDE_NO_IRQ
);
1155 * un-busy the hwgroup etc, and clear any pending DMA status. we want to
1156 * retry the current request in pio mode instead of risking tossing it
1159 static ide_startstop_t
ide_dma_timeout_retry(ide_drive_t
*drive
, int error
)
1161 ide_hwif_t
*hwif
= HWIF(drive
);
1163 ide_startstop_t ret
= ide_stopped
;
1166 * end current dma transaction
1170 printk(KERN_WARNING
"%s: DMA timeout error\n", drive
->name
);
1171 (void)hwif
->dma_ops
->dma_end(drive
);
1172 ret
= ide_error(drive
, "dma timeout error",
1173 ide_read_status(drive
));
1175 printk(KERN_WARNING
"%s: DMA timeout retry\n", drive
->name
);
1176 hwif
->dma_ops
->dma_timeout(drive
);
1180 * disable dma for now, but remember that we did so because of
1181 * a timeout -- we'll reenable after we finish this next request
1182 * (or rather the first chunk of it) in pio.
1185 drive
->state
= DMA_PIO_RETRY
;
1186 ide_dma_off_quietly(drive
);
1189 * un-busy drive etc (hwgroup->busy is cleared on return) and
1190 * make sure request is sane
1192 rq
= HWGROUP(drive
)->rq
;
1197 HWGROUP(drive
)->rq
= NULL
;
1204 rq
->sector
= rq
->bio
->bi_sector
;
1205 rq
->current_nr_sectors
= bio_iovec(rq
->bio
)->bv_len
>> 9;
1206 rq
->hard_cur_sectors
= rq
->current_nr_sectors
;
1207 rq
->buffer
= bio_data(rq
->bio
);
1213 * ide_timer_expiry - handle lack of an IDE interrupt
1214 * @data: timer callback magic (hwgroup)
1216 * An IDE command has timed out before the expected drive return
1217 * occurred. At this point we attempt to clean up the current
1218 * mess. If the current handler includes an expiry handler then
1219 * we invoke the expiry handler, and providing it is happy the
1220 * work is done. If that fails we apply generic recovery rules
1221 * invoking the handler and checking the drive DMA status. We
1222 * have an excessively incestuous relationship with the DMA
1223 * logic that wants cleaning up.
1226 void ide_timer_expiry (unsigned long data
)
1228 ide_hwgroup_t
*hwgroup
= (ide_hwgroup_t
*) data
;
1229 ide_handler_t
*handler
;
1230 ide_expiry_t
*expiry
;
1231 unsigned long flags
;
1232 unsigned long wait
= -1;
1234 spin_lock_irqsave(&ide_lock
, flags
);
1236 if (((handler
= hwgroup
->handler
) == NULL
) ||
1237 (hwgroup
->req_gen
!= hwgroup
->req_gen_timer
)) {
1239 * Either a marginal timeout occurred
1240 * (got the interrupt just as timer expired),
1241 * or we were "sleeping" to give other devices a chance.
1242 * Either way, we don't really want to complain about anything.
1244 if (hwgroup
->sleeping
) {
1245 hwgroup
->sleeping
= 0;
1249 ide_drive_t
*drive
= hwgroup
->drive
;
1251 printk(KERN_ERR
"ide_timer_expiry: hwgroup->drive was NULL\n");
1252 hwgroup
->handler
= NULL
;
1255 ide_startstop_t startstop
= ide_stopped
;
1256 if (!hwgroup
->busy
) {
1257 hwgroup
->busy
= 1; /* paranoia */
1258 printk(KERN_ERR
"%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive
->name
);
1260 if ((expiry
= hwgroup
->expiry
) != NULL
) {
1262 if ((wait
= expiry(drive
)) > 0) {
1264 hwgroup
->timer
.expires
= jiffies
+ wait
;
1265 hwgroup
->req_gen_timer
= hwgroup
->req_gen
;
1266 add_timer(&hwgroup
->timer
);
1267 spin_unlock_irqrestore(&ide_lock
, flags
);
1271 hwgroup
->handler
= NULL
;
1273 * We need to simulate a real interrupt when invoking
1274 * the handler() function, which means we need to
1275 * globally mask the specific IRQ:
1277 spin_unlock(&ide_lock
);
1279 /* disable_irq_nosync ?? */
1280 disable_irq(hwif
->irq
);
1282 * as if we were handling an interrupt */
1283 local_irq_disable();
1284 if (hwgroup
->polling
) {
1285 startstop
= handler(drive
);
1286 } else if (drive_is_ready(drive
)) {
1287 if (drive
->waiting_for_dma
)
1288 hwif
->dma_ops
->dma_lost_irq(drive
);
1289 (void)ide_ack_intr(hwif
);
1290 printk(KERN_WARNING
"%s: lost interrupt\n", drive
->name
);
1291 startstop
= handler(drive
);
1293 if (drive
->waiting_for_dma
) {
1294 startstop
= ide_dma_timeout_retry(drive
, wait
);
1297 ide_error(drive
, "irq timeout",
1298 ide_read_status(drive
));
1300 drive
->service_time
= jiffies
- drive
->service_start
;
1301 spin_lock_irq(&ide_lock
);
1302 enable_irq(hwif
->irq
);
1303 if (startstop
== ide_stopped
)
1307 ide_do_request(hwgroup
, IDE_NO_IRQ
);
1308 spin_unlock_irqrestore(&ide_lock
, flags
);
1312 * unexpected_intr - handle an unexpected IDE interrupt
1313 * @irq: interrupt line
1314 * @hwgroup: hwgroup being processed
1316 * There's nothing really useful we can do with an unexpected interrupt,
1317 * other than reading the status register (to clear it), and logging it.
1318 * There should be no way that an irq can happen before we're ready for it,
1319 * so we needn't worry much about losing an "important" interrupt here.
1321 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever
1322 * the drive enters "idle", "standby", or "sleep" mode, so if the status
1323 * looks "good", we just ignore the interrupt completely.
1325 * This routine assumes __cli() is in effect when called.
1327 * If an unexpected interrupt happens on irq15 while we are handling irq14
1328 * and if the two interfaces are "serialized" (CMD640), then it looks like
1329 * we could screw up by interfering with a new request being set up for
1332 * In reality, this is a non-issue. The new command is not sent unless
1333 * the drive is ready to accept one, in which case we know the drive is
1334 * not trying to interrupt us. And ide_set_handler() is always invoked
1335 * before completing the issuance of any new drive command, so we will not
1336 * be accidentally invoked as a result of any valid command completion
1339 * Note that we must walk the entire hwgroup here. We know which hwif
1340 * is doing the current command, but we don't know which hwif burped
1344 static void unexpected_intr (int irq
, ide_hwgroup_t
*hwgroup
)
1347 ide_hwif_t
*hwif
= hwgroup
->hwif
;
1350 * handle the unexpected interrupt
1353 if (hwif
->irq
== irq
) {
1354 stat
= hwif
->INB(hwif
->io_ports
.status_addr
);
1355 if (!OK_STAT(stat
, READY_STAT
, BAD_STAT
)) {
1356 /* Try to not flood the console with msgs */
1357 static unsigned long last_msgtime
, count
;
1359 if (time_after(jiffies
, last_msgtime
+ HZ
)) {
1360 last_msgtime
= jiffies
;
1361 printk(KERN_ERR
"%s%s: unexpected interrupt, "
1362 "status=0x%02x, count=%ld\n",
1364 (hwif
->next
==hwgroup
->hwif
) ? "" : "(?)", stat
, count
);
1368 } while ((hwif
= hwif
->next
) != hwgroup
->hwif
);
1372 * ide_intr - default IDE interrupt handler
1373 * @irq: interrupt number
1374 * @dev_id: hwif group
1375 * @regs: unused weirdness from the kernel irq layer
1377 * This is the default IRQ handler for the IDE layer. You should
1378 * not need to override it. If you do be aware it is subtle in
1381 * hwgroup->hwif is the interface in the group currently performing
1382 * a command. hwgroup->drive is the drive and hwgroup->handler is
1383 * the IRQ handler to call. As we issue a command the handlers
1384 * step through multiple states, reassigning the handler to the
1385 * next step in the process. Unlike a smart SCSI controller IDE
1386 * expects the main processor to sequence the various transfer
1387 * stages. We also manage a poll timer to catch up with most
1388 * timeout situations. There are still a few where the handlers
1389 * don't ever decide to give up.
1391 * The handler eventually returns ide_stopped to indicate the
1392 * request completed. At this point we issue the next request
1393 * on the hwgroup and the process begins again.
1396 irqreturn_t
ide_intr (int irq
, void *dev_id
)
1398 unsigned long flags
;
1399 ide_hwgroup_t
*hwgroup
= (ide_hwgroup_t
*)dev_id
;
1402 ide_handler_t
*handler
;
1403 ide_startstop_t startstop
;
1405 spin_lock_irqsave(&ide_lock
, flags
);
1406 hwif
= hwgroup
->hwif
;
1408 if (!ide_ack_intr(hwif
)) {
1409 spin_unlock_irqrestore(&ide_lock
, flags
);
1413 if ((handler
= hwgroup
->handler
) == NULL
|| hwgroup
->polling
) {
1415 * Not expecting an interrupt from this drive.
1416 * That means this could be:
1417 * (1) an interrupt from another PCI device
1418 * sharing the same PCI INT# as us.
1419 * or (2) a drive just entered sleep or standby mode,
1420 * and is interrupting to let us know.
1421 * or (3) a spurious interrupt of unknown origin.
1423 * For PCI, we cannot tell the difference,
1424 * so in that case we just ignore it and hope it goes away.
1426 * FIXME: unexpected_intr should be hwif-> then we can
1427 * remove all the ifdef PCI crap
1429 #ifdef CONFIG_BLK_DEV_IDEPCI
1430 if (hwif
->chipset
!= ide_pci
)
1431 #endif /* CONFIG_BLK_DEV_IDEPCI */
1434 * Probably not a shared PCI interrupt,
1435 * so we can safely try to do something about it:
1437 unexpected_intr(irq
, hwgroup
);
1438 #ifdef CONFIG_BLK_DEV_IDEPCI
1441 * Whack the status register, just in case
1442 * we have a leftover pending IRQ.
1444 (void) hwif
->INB(hwif
->io_ports
.status_addr
);
1445 #endif /* CONFIG_BLK_DEV_IDEPCI */
1447 spin_unlock_irqrestore(&ide_lock
, flags
);
1450 drive
= hwgroup
->drive
;
1453 * This should NEVER happen, and there isn't much
1454 * we could do about it here.
1456 * [Note - this can occur if the drive is hot unplugged]
1458 spin_unlock_irqrestore(&ide_lock
, flags
);
1461 if (!drive_is_ready(drive
)) {
1463 * This happens regularly when we share a PCI IRQ with
1464 * another device. Unfortunately, it can also happen
1465 * with some buggy drives that trigger the IRQ before
1466 * their status register is up to date. Hopefully we have
1467 * enough advance overhead that the latter isn't a problem.
1469 spin_unlock_irqrestore(&ide_lock
, flags
);
1472 if (!hwgroup
->busy
) {
1473 hwgroup
->busy
= 1; /* paranoia */
1474 printk(KERN_ERR
"%s: ide_intr: hwgroup->busy was 0 ??\n", drive
->name
);
1476 hwgroup
->handler
= NULL
;
1478 del_timer(&hwgroup
->timer
);
1479 spin_unlock(&ide_lock
);
1481 /* Some controllers might set DMA INTR no matter DMA or PIO;
1482 * bmdma status might need to be cleared even for
1483 * PIO interrupts to prevent spurious/lost irq.
1485 if (hwif
->ide_dma_clear_irq
&& !(drive
->waiting_for_dma
))
1486 /* ide_dma_end() needs bmdma status for error checking.
1487 * So, skip clearing bmdma status here and leave it
1488 * to ide_dma_end() if this is dma interrupt.
1490 hwif
->ide_dma_clear_irq(drive
);
1493 local_irq_enable_in_hardirq();
1494 /* service this interrupt, may set handler for next interrupt */
1495 startstop
= handler(drive
);
1496 spin_lock_irq(&ide_lock
);
1499 * Note that handler() may have set things up for another
1500 * interrupt to occur soon, but it cannot happen until
1501 * we exit from this routine, because it will be the
1502 * same irq as is currently being serviced here, and Linux
1503 * won't allow another of the same (on any CPU) until we return.
1505 drive
->service_time
= jiffies
- drive
->service_start
;
1506 if (startstop
== ide_stopped
) {
1507 if (hwgroup
->handler
== NULL
) { /* paranoia */
1509 ide_do_request(hwgroup
, hwif
->irq
);
1511 printk(KERN_ERR
"%s: ide_intr: huh? expected NULL handler "
1512 "on exit\n", drive
->name
);
1515 spin_unlock_irqrestore(&ide_lock
, flags
);
1520 * ide_do_drive_cmd - issue IDE special command
1521 * @drive: device to issue command
1522 * @rq: request to issue
1524 * This function issues a special IDE device request
1525 * onto the request queue.
1527 * the rq is queued at the head of the request queue, displacing
1528 * the currently-being-processed request and this function
1529 * returns immediately without waiting for the new rq to be
1530 * completed. This is VERY DANGEROUS, and is intended for
1531 * careful use by the ATAPI tape/cdrom driver code.
1534 void ide_do_drive_cmd(ide_drive_t
*drive
, struct request
*rq
)
1536 unsigned long flags
;
1537 ide_hwgroup_t
*hwgroup
= HWGROUP(drive
);
1539 spin_lock_irqsave(&ide_lock
, flags
);
1541 __elv_add_request(drive
->queue
, rq
, ELEVATOR_INSERT_FRONT
, 1);
1542 __generic_unplug_device(drive
->queue
);
1543 spin_unlock_irqrestore(&ide_lock
, flags
);
1546 EXPORT_SYMBOL(ide_do_drive_cmd
);
1548 void ide_pktcmd_tf_load(ide_drive_t
*drive
, u32 tf_flags
, u16 bcount
, u8 dma
)
1552 memset(&task
, 0, sizeof(task
));
1553 task
.tf_flags
= IDE_TFLAG_OUT_LBAH
| IDE_TFLAG_OUT_LBAM
|
1554 IDE_TFLAG_OUT_FEATURE
| tf_flags
;
1555 task
.tf
.feature
= dma
; /* Use PIO/DMA */
1556 task
.tf
.lbam
= bcount
& 0xff;
1557 task
.tf
.lbah
= (bcount
>> 8) & 0xff;
1559 ide_tf_dump(drive
->name
, &task
.tf
);
1560 ide_set_irq(drive
, 1);
1561 SELECT_MASK(drive
, 0);
1562 drive
->hwif
->tf_load(drive
, &task
);
1565 EXPORT_SYMBOL_GPL(ide_pktcmd_tf_load
);
1567 void ide_pad_transfer(ide_drive_t
*drive
, int write
, int len
)
1569 ide_hwif_t
*hwif
= drive
->hwif
;
1574 hwif
->output_data(drive
, NULL
, buf
, min(4, len
));
1576 hwif
->input_data(drive
, NULL
, buf
, min(4, len
));
1580 EXPORT_SYMBOL_GPL(ide_pad_transfer
);