Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * IDE I/O functions | |
3 | * | |
4 | * Basic PIO and command management functionality. | |
5 | * | |
6 | * This code was split off from ide.c. See ide.c for history and original | |
7 | * copyrights. | |
8 | * | |
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 | |
12 | * later version. | |
13 | * | |
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. | |
18 | * | |
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. | |
24 | */ | |
25 | ||
26 | ||
1da177e4 LT |
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> | |
32 | #include <linux/mm.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> | |
3ceca727 | 43 | #include <linux/hdreg.h> |
1da177e4 LT |
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> | |
1977f032 | 51 | #include <linux/bitops.h> |
1da177e4 LT |
52 | |
53 | #include <asm/byteorder.h> | |
54 | #include <asm/irq.h> | |
55 | #include <asm/uaccess.h> | |
56 | #include <asm/io.h> | |
1da177e4 | 57 | |
a7ff7d41 | 58 | static int __ide_end_request(ide_drive_t *drive, struct request *rq, |
bbc615b1 | 59 | int uptodate, unsigned int nr_bytes, int dequeue) |
1da177e4 LT |
60 | { |
61 | int ret = 1; | |
5e36bb6e KU |
62 | int error = 0; |
63 | ||
64 | if (uptodate <= 0) | |
65 | error = uptodate ? uptodate : -EIO; | |
1da177e4 | 66 | |
1da177e4 LT |
67 | /* |
68 | * if failfast is set on a request, override number of sectors and | |
69 | * complete the whole request right now | |
70 | */ | |
5e36bb6e | 71 | if (blk_noretry_request(rq) && error) |
41e9d344 | 72 | nr_bytes = rq->hard_nr_sectors << 9; |
1da177e4 | 73 | |
5e36bb6e | 74 | if (!blk_fs_request(rq) && error && !rq->errors) |
1da177e4 LT |
75 | rq->errors = -EIO; |
76 | ||
77 | /* | |
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 | |
80 | */ | |
c3922048 BZ |
81 | if ((drive->dev_flags & IDE_DFLAG_DMA_PIO_RETRY) && |
82 | drive->retry_pio <= 3) { | |
83 | drive->dev_flags &= ~IDE_DFLAG_DMA_PIO_RETRY; | |
4a546e04 | 84 | ide_dma_on(drive); |
1da177e4 LT |
85 | } |
86 | ||
5e36bb6e KU |
87 | if (!__blk_end_request(rq, error, nr_bytes)) { |
88 | if (dequeue) | |
bbc615b1 | 89 | HWGROUP(drive)->rq = NULL; |
1da177e4 LT |
90 | ret = 0; |
91 | } | |
8672d571 | 92 | |
1da177e4 LT |
93 | return ret; |
94 | } | |
1da177e4 LT |
95 | |
96 | /** | |
97 | * ide_end_request - complete an IDE I/O | |
98 | * @drive: IDE device for the I/O | |
99 | * @uptodate: | |
100 | * @nr_sectors: number of sectors completed | |
101 | * | |
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. | |
105 | */ | |
106 | ||
107 | int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors) | |
108 | { | |
41e9d344 | 109 | unsigned int nr_bytes = nr_sectors << 9; |
1da177e4 LT |
110 | struct request *rq; |
111 | unsigned long flags; | |
112 | int ret = 1; | |
113 | ||
8672d571 JA |
114 | /* |
115 | * room for locking improvements here, the calls below don't | |
116 | * need the queue lock held at all | |
117 | */ | |
1da177e4 LT |
118 | spin_lock_irqsave(&ide_lock, flags); |
119 | rq = HWGROUP(drive)->rq; | |
120 | ||
41e9d344 JA |
121 | if (!nr_bytes) { |
122 | if (blk_pc_request(rq)) | |
123 | nr_bytes = rq->data_len; | |
124 | else | |
125 | nr_bytes = rq->hard_cur_sectors << 9; | |
126 | } | |
1da177e4 | 127 | |
bbc615b1 | 128 | ret = __ide_end_request(drive, rq, uptodate, nr_bytes, 1); |
1da177e4 LT |
129 | |
130 | spin_unlock_irqrestore(&ide_lock, flags); | |
131 | return ret; | |
132 | } | |
133 | EXPORT_SYMBOL(ide_end_request); | |
134 | ||
1da177e4 LT |
135 | static void ide_complete_power_step(ide_drive_t *drive, struct request *rq, u8 stat, u8 error) |
136 | { | |
c00895ab | 137 | struct request_pm_state *pm = rq->data; |
ad3cadda | 138 | |
1da177e4 LT |
139 | if (drive->media != ide_disk) |
140 | return; | |
141 | ||
ad3cadda | 142 | switch (pm->pm_step) { |
0d346ba0 | 143 | case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */ |
ad3cadda | 144 | if (pm->pm_state == PM_EVENT_FREEZE) |
0d346ba0 | 145 | pm->pm_step = IDE_PM_COMPLETED; |
1da177e4 | 146 | else |
0d346ba0 | 147 | pm->pm_step = IDE_PM_STANDBY; |
1da177e4 | 148 | break; |
0d346ba0 BZ |
149 | case IDE_PM_STANDBY: /* Suspend step 2 (standby) */ |
150 | pm->pm_step = IDE_PM_COMPLETED; | |
1da177e4 | 151 | break; |
0d346ba0 BZ |
152 | case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */ |
153 | pm->pm_step = IDE_PM_IDLE; | |
8c2c0118 | 154 | break; |
0d346ba0 BZ |
155 | case IDE_PM_IDLE: /* Resume step 2 (idle)*/ |
156 | pm->pm_step = IDE_PM_RESTORE_DMA; | |
1da177e4 LT |
157 | break; |
158 | } | |
159 | } | |
160 | ||
161 | static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq) | |
162 | { | |
c00895ab | 163 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
164 | ide_task_t *args = rq->special; |
165 | ||
166 | memset(args, 0, sizeof(*args)); | |
167 | ||
ad3cadda | 168 | switch (pm->pm_step) { |
0d346ba0 | 169 | case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */ |
1da177e4 LT |
170 | if (drive->media != ide_disk) |
171 | break; | |
172 | /* Not supported? Switch to next step now. */ | |
97100fc8 BZ |
173 | if (ata_id_flush_enabled(drive->id) == 0 || |
174 | (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) { | |
1da177e4 LT |
175 | ide_complete_power_step(drive, rq, 0, 0); |
176 | return ide_stopped; | |
177 | } | |
ff2779b5 | 178 | if (ata_id_flush_ext_enabled(drive->id)) |
aaaade3f | 179 | args->tf.command = ATA_CMD_FLUSH_EXT; |
1da177e4 | 180 | else |
aaaade3f | 181 | args->tf.command = ATA_CMD_FLUSH; |
74095a91 | 182 | goto out_do_tf; |
0d346ba0 | 183 | case IDE_PM_STANDBY: /* Suspend step 2 (standby) */ |
aaaade3f | 184 | args->tf.command = ATA_CMD_STANDBYNOW1; |
74095a91 | 185 | goto out_do_tf; |
0d346ba0 | 186 | case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */ |
26bcb879 | 187 | ide_set_max_pio(drive); |
317a46a2 | 188 | /* |
0d346ba0 | 189 | * skip IDE_PM_IDLE for ATAPI devices |
317a46a2 BZ |
190 | */ |
191 | if (drive->media != ide_disk) | |
0d346ba0 | 192 | pm->pm_step = IDE_PM_RESTORE_DMA; |
317a46a2 BZ |
193 | else |
194 | ide_complete_power_step(drive, rq, 0, 0); | |
8c2c0118 | 195 | return ide_stopped; |
0d346ba0 | 196 | case IDE_PM_IDLE: /* Resume step 2 (idle) */ |
aaaade3f | 197 | args->tf.command = ATA_CMD_IDLEIMMEDIATE; |
74095a91 | 198 | goto out_do_tf; |
0d346ba0 | 199 | case IDE_PM_RESTORE_DMA: /* Resume step 3 (restore DMA) */ |
1da177e4 | 200 | /* |
0ae2e178 | 201 | * Right now, all we do is call ide_set_dma(drive), |
1da177e4 LT |
202 | * we could be smarter and check for current xfer_speed |
203 | * in struct drive etc... | |
204 | */ | |
5e37bdc0 | 205 | if (drive->hwif->dma_ops == NULL) |
1da177e4 | 206 | break; |
8987d21b | 207 | /* |
97100fc8 | 208 | * TODO: respect IDE_DFLAG_USING_DMA |
8987d21b | 209 | */ |
3608b5d7 | 210 | ide_set_dma(drive); |
1da177e4 LT |
211 | break; |
212 | } | |
0d346ba0 BZ |
213 | |
214 | pm->pm_step = IDE_PM_COMPLETED; | |
1da177e4 | 215 | return ide_stopped; |
74095a91 BZ |
216 | |
217 | out_do_tf: | |
657cc1a8 | 218 | args->tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE; |
ac026ff2 | 219 | args->data_phase = TASKFILE_NO_DATA; |
74095a91 | 220 | return do_rw_taskfile(drive, args); |
1da177e4 LT |
221 | } |
222 | ||
dbe217af AC |
223 | /** |
224 | * ide_end_dequeued_request - complete an IDE I/O | |
225 | * @drive: IDE device for the I/O | |
226 | * @uptodate: | |
227 | * @nr_sectors: number of sectors completed | |
228 | * | |
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. | |
233 | * | |
234 | * NOTE: This path does not handle barrier, but barrier is not supported | |
235 | * on ide-cd anyway. | |
236 | */ | |
237 | ||
238 | int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq, | |
239 | int uptodate, int nr_sectors) | |
240 | { | |
241 | unsigned long flags; | |
bbc615b1 | 242 | int ret; |
dbe217af AC |
243 | |
244 | spin_lock_irqsave(&ide_lock, flags); | |
4aff5e23 | 245 | BUG_ON(!blk_rq_started(rq)); |
bbc615b1 | 246 | ret = __ide_end_request(drive, rq, uptodate, nr_sectors << 9, 0); |
dbe217af | 247 | spin_unlock_irqrestore(&ide_lock, flags); |
bbc615b1 | 248 | |
dbe217af AC |
249 | return ret; |
250 | } | |
251 | EXPORT_SYMBOL_GPL(ide_end_dequeued_request); | |
252 | ||
253 | ||
1da177e4 LT |
254 | /** |
255 | * ide_complete_pm_request - end the current Power Management request | |
256 | * @drive: target drive | |
257 | * @rq: request | |
258 | * | |
259 | * This function cleans up the current PM request and stops the queue | |
260 | * if necessary. | |
261 | */ | |
262 | static void ide_complete_pm_request (ide_drive_t *drive, struct request *rq) | |
263 | { | |
264 | unsigned long flags; | |
265 | ||
266 | #ifdef DEBUG_PM | |
267 | printk("%s: completing PM request, %s\n", drive->name, | |
268 | blk_pm_suspend_request(rq) ? "suspend" : "resume"); | |
269 | #endif | |
270 | spin_lock_irqsave(&ide_lock, flags); | |
271 | if (blk_pm_suspend_request(rq)) { | |
272 | blk_stop_queue(drive->queue); | |
273 | } else { | |
97100fc8 | 274 | drive->dev_flags &= ~IDE_DFLAG_BLOCKED; |
1da177e4 LT |
275 | blk_start_queue(drive->queue); |
276 | } | |
1da177e4 | 277 | HWGROUP(drive)->rq = NULL; |
5e36bb6e KU |
278 | if (__blk_end_request(rq, 0, 0)) |
279 | BUG(); | |
1da177e4 LT |
280 | spin_unlock_irqrestore(&ide_lock, flags); |
281 | } | |
282 | ||
1da177e4 LT |
283 | /** |
284 | * ide_end_drive_cmd - end an explicit drive command | |
285 | * @drive: command | |
286 | * @stat: status bits | |
287 | * @err: error bits | |
288 | * | |
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. | |
292 | * | |
293 | * In LBA48 mode we have to read the register set twice to get | |
294 | * all the extra information out. | |
295 | */ | |
296 | ||
297 | void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err) | |
298 | { | |
1da177e4 LT |
299 | unsigned long flags; |
300 | struct request *rq; | |
301 | ||
302 | spin_lock_irqsave(&ide_lock, flags); | |
303 | rq = HWGROUP(drive)->rq; | |
304 | spin_unlock_irqrestore(&ide_lock, flags); | |
305 | ||
7267c337 | 306 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
395d8ef5 BZ |
307 | ide_task_t *task = (ide_task_t *)rq->special; |
308 | ||
1da177e4 | 309 | if (rq->errors == 0) |
3a7d2484 | 310 | rq->errors = !OK_STAT(stat, ATA_DRDY, BAD_STAT); |
395d8ef5 BZ |
311 | |
312 | if (task) { | |
313 | struct ide_taskfile *tf = &task->tf; | |
650d841d | 314 | |
650d841d | 315 | tf->error = err; |
650d841d | 316 | tf->status = stat; |
1da177e4 | 317 | |
374e042c | 318 | drive->hwif->tp_ops->tf_read(drive, task); |
395d8ef5 BZ |
319 | |
320 | if (task->tf_flags & IDE_TFLAG_DYN) | |
321 | kfree(task); | |
1da177e4 LT |
322 | } |
323 | } else if (blk_pm_request(rq)) { | |
c00895ab | 324 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
325 | #ifdef DEBUG_PM |
326 | printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n", | |
327 | drive->name, rq->pm->pm_step, stat, err); | |
328 | #endif | |
329 | ide_complete_power_step(drive, rq, stat, err); | |
0d346ba0 | 330 | if (pm->pm_step == IDE_PM_COMPLETED) |
1da177e4 LT |
331 | ide_complete_pm_request(drive, rq); |
332 | return; | |
333 | } | |
334 | ||
335 | spin_lock_irqsave(&ide_lock, flags); | |
1da177e4 LT |
336 | HWGROUP(drive)->rq = NULL; |
337 | rq->errors = err; | |
3b0e044d KU |
338 | if (unlikely(__blk_end_request(rq, (rq->errors ? -EIO : 0), |
339 | blk_rq_bytes(rq)))) | |
5e36bb6e | 340 | BUG(); |
1da177e4 LT |
341 | spin_unlock_irqrestore(&ide_lock, flags); |
342 | } | |
343 | ||
344 | EXPORT_SYMBOL(ide_end_drive_cmd); | |
345 | ||
1da177e4 LT |
346 | static void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
347 | { | |
348 | if (rq->rq_disk) { | |
349 | ide_driver_t *drv; | |
350 | ||
351 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
352 | drv->end_request(drive, 0, 0); | |
353 | } else | |
354 | ide_end_request(drive, 0, 0); | |
355 | } | |
356 | ||
357 | static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
358 | { | |
359 | ide_hwif_t *hwif = drive->hwif; | |
360 | ||
97100fc8 BZ |
361 | if ((stat & ATA_BUSY) || |
362 | ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { | |
1da177e4 LT |
363 | /* other bits are useless when BUSY */ |
364 | rq->errors |= ERROR_RESET; | |
3a7d2484 | 365 | } else if (stat & ATA_ERR) { |
1da177e4 | 366 | /* err has different meaning on cdrom and tape */ |
3a7d2484 | 367 | if (err == ATA_ABORTED) { |
d1d76714 | 368 | if ((drive->dev_flags & IDE_DFLAG_LBA) && |
aaaade3f BZ |
369 | /* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */ |
370 | hwif->tp_ops->read_status(hwif) == ATA_CMD_INIT_DEV_PARAMS) | |
1da177e4 LT |
371 | return ide_stopped; |
372 | } else if ((err & BAD_CRC) == BAD_CRC) { | |
373 | /* UDMA crc error, just retry the operation */ | |
374 | drive->crc_count++; | |
3a7d2484 | 375 | } else if (err & (ATA_BBK | ATA_UNC)) { |
1da177e4 LT |
376 | /* retries won't help these */ |
377 | rq->errors = ERROR_MAX; | |
3a7d2484 | 378 | } else if (err & ATA_TRK0NF) { |
1da177e4 LT |
379 | /* help it find track zero */ |
380 | rq->errors |= ERROR_RECAL; | |
381 | } | |
382 | } | |
383 | ||
3a7d2484 | 384 | if ((stat & ATA_DRQ) && rq_data_dir(rq) == READ && |
57279a7a BZ |
385 | (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) { |
386 | int nsect = drive->mult_count ? drive->mult_count : 1; | |
387 | ||
388 | ide_pad_transfer(drive, READ, nsect * SECTOR_SIZE); | |
389 | } | |
1da177e4 | 390 | |
513daadd SS |
391 | if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) { |
392 | ide_kill_rq(drive, rq); | |
393 | return ide_stopped; | |
394 | } | |
395 | ||
3a7d2484 | 396 | if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) |
513daadd | 397 | rq->errors |= ERROR_RESET; |
1da177e4 | 398 | |
513daadd | 399 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { |
1da177e4 | 400 | ++rq->errors; |
513daadd | 401 | return ide_do_reset(drive); |
1da177e4 | 402 | } |
513daadd SS |
403 | |
404 | if ((rq->errors & ERROR_RECAL) == ERROR_RECAL) | |
405 | drive->special.b.recalibrate = 1; | |
406 | ||
407 | ++rq->errors; | |
408 | ||
1da177e4 LT |
409 | return ide_stopped; |
410 | } | |
411 | ||
412 | static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
413 | { | |
414 | ide_hwif_t *hwif = drive->hwif; | |
415 | ||
97100fc8 BZ |
416 | if ((stat & ATA_BUSY) || |
417 | ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { | |
1da177e4 LT |
418 | /* other bits are useless when BUSY */ |
419 | rq->errors |= ERROR_RESET; | |
420 | } else { | |
421 | /* add decoding error stuff */ | |
422 | } | |
423 | ||
3a7d2484 | 424 | if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) |
1da177e4 | 425 | /* force an abort */ |
aaaade3f | 426 | hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE); |
1da177e4 LT |
427 | |
428 | if (rq->errors >= ERROR_MAX) { | |
429 | ide_kill_rq(drive, rq); | |
430 | } else { | |
431 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { | |
432 | ++rq->errors; | |
433 | return ide_do_reset(drive); | |
434 | } | |
435 | ++rq->errors; | |
436 | } | |
437 | ||
438 | return ide_stopped; | |
439 | } | |
440 | ||
441 | ide_startstop_t | |
442 | __ide_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
443 | { | |
444 | if (drive->media == ide_disk) | |
445 | return ide_ata_error(drive, rq, stat, err); | |
446 | return ide_atapi_error(drive, rq, stat, err); | |
447 | } | |
448 | ||
449 | EXPORT_SYMBOL_GPL(__ide_error); | |
450 | ||
451 | /** | |
452 | * ide_error - handle an error on the IDE | |
453 | * @drive: drive the error occurred on | |
454 | * @msg: message to report | |
455 | * @stat: status bits | |
456 | * | |
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 | |
461 | * do | |
462 | */ | |
463 | ||
464 | ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat) | |
465 | { | |
466 | struct request *rq; | |
467 | u8 err; | |
468 | ||
469 | err = ide_dump_status(drive, msg, stat); | |
470 | ||
471 | if ((rq = HWGROUP(drive)->rq) == NULL) | |
472 | return ide_stopped; | |
473 | ||
474 | /* retry only "normal" I/O: */ | |
4aff5e23 | 475 | if (!blk_fs_request(rq)) { |
1da177e4 LT |
476 | rq->errors = 1; |
477 | ide_end_drive_cmd(drive, stat, err); | |
478 | return ide_stopped; | |
479 | } | |
480 | ||
481 | if (rq->rq_disk) { | |
482 | ide_driver_t *drv; | |
483 | ||
484 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
485 | return drv->error(drive, rq, stat, err); | |
486 | } else | |
487 | return __ide_error(drive, rq, stat, err); | |
488 | } | |
489 | ||
490 | EXPORT_SYMBOL_GPL(ide_error); | |
491 | ||
57d7366b | 492 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 493 | { |
57d7366b BZ |
494 | tf->nsect = drive->sect; |
495 | tf->lbal = drive->sect; | |
496 | tf->lbam = drive->cyl; | |
497 | tf->lbah = drive->cyl >> 8; | |
7f612f27 | 498 | tf->device = (drive->head - 1) | drive->select; |
aaaade3f | 499 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
1da177e4 LT |
500 | } |
501 | ||
57d7366b | 502 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 503 | { |
57d7366b | 504 | tf->nsect = drive->sect; |
aaaade3f | 505 | tf->command = ATA_CMD_RESTORE; |
1da177e4 LT |
506 | } |
507 | ||
57d7366b | 508 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 509 | { |
57d7366b | 510 | tf->nsect = drive->mult_req; |
aaaade3f | 511 | tf->command = ATA_CMD_SET_MULTI; |
1da177e4 LT |
512 | } |
513 | ||
514 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) | |
515 | { | |
516 | special_t *s = &drive->special; | |
517 | ide_task_t args; | |
518 | ||
519 | memset(&args, 0, sizeof(ide_task_t)); | |
ac026ff2 | 520 | args.data_phase = TASKFILE_NO_DATA; |
1da177e4 LT |
521 | |
522 | if (s->b.set_geometry) { | |
523 | s->b.set_geometry = 0; | |
57d7366b | 524 | ide_tf_set_specify_cmd(drive, &args.tf); |
1da177e4 LT |
525 | } else if (s->b.recalibrate) { |
526 | s->b.recalibrate = 0; | |
57d7366b | 527 | ide_tf_set_restore_cmd(drive, &args.tf); |
1da177e4 LT |
528 | } else if (s->b.set_multmode) { |
529 | s->b.set_multmode = 0; | |
57d7366b | 530 | ide_tf_set_setmult_cmd(drive, &args.tf); |
1da177e4 LT |
531 | } else if (s->all) { |
532 | int special = s->all; | |
533 | s->all = 0; | |
534 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); | |
535 | return ide_stopped; | |
536 | } | |
537 | ||
657cc1a8 | 538 | args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
57d7366b | 539 | IDE_TFLAG_CUSTOM_HANDLER; |
74095a91 | 540 | |
1da177e4 LT |
541 | do_rw_taskfile(drive, &args); |
542 | ||
543 | return ide_started; | |
544 | } | |
545 | ||
546 | /** | |
547 | * do_special - issue some special commands | |
548 | * @drive: drive the command is for | |
549 | * | |
aaaade3f BZ |
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. | |
552 | * | |
553 | * It used to do much more, but has been scaled back. | |
1da177e4 LT |
554 | */ |
555 | ||
556 | static ide_startstop_t do_special (ide_drive_t *drive) | |
557 | { | |
558 | special_t *s = &drive->special; | |
559 | ||
560 | #ifdef DEBUG | |
561 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); | |
562 | #endif | |
6982daf7 BZ |
563 | if (drive->media == ide_disk) |
564 | return ide_disk_special(drive); | |
1da177e4 | 565 | |
6982daf7 BZ |
566 | s->all = 0; |
567 | drive->mult_req = 0; | |
568 | return ide_stopped; | |
1da177e4 LT |
569 | } |
570 | ||
571 | void ide_map_sg(ide_drive_t *drive, struct request *rq) | |
572 | { | |
573 | ide_hwif_t *hwif = drive->hwif; | |
574 | struct scatterlist *sg = hwif->sg_table; | |
575 | ||
576 | if (hwif->sg_mapped) /* needed by ide-scsi */ | |
577 | return; | |
578 | ||
4aff5e23 | 579 | if (rq->cmd_type != REQ_TYPE_ATA_TASKFILE) { |
1da177e4 LT |
580 | hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); |
581 | } else { | |
582 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); | |
583 | hwif->sg_nents = 1; | |
584 | } | |
585 | } | |
586 | ||
587 | EXPORT_SYMBOL_GPL(ide_map_sg); | |
588 | ||
589 | void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq) | |
590 | { | |
591 | ide_hwif_t *hwif = drive->hwif; | |
592 | ||
593 | hwif->nsect = hwif->nleft = rq->nr_sectors; | |
55c16a70 JA |
594 | hwif->cursg_ofs = 0; |
595 | hwif->cursg = NULL; | |
1da177e4 LT |
596 | } |
597 | ||
598 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); | |
599 | ||
600 | /** | |
601 | * execute_drive_command - issue special drive command | |
338cec32 | 602 | * @drive: the drive to issue the command on |
1da177e4 LT |
603 | * @rq: the request structure holding the command |
604 | * | |
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 | |
610 | */ | |
611 | ||
612 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, | |
613 | struct request *rq) | |
614 | { | |
615 | ide_hwif_t *hwif = HWIF(drive); | |
7267c337 | 616 | ide_task_t *task = rq->special; |
1da177e4 | 617 | |
7267c337 | 618 | if (task) { |
21d535c9 | 619 | hwif->data_phase = task->data_phase; |
1da177e4 LT |
620 | |
621 | switch (hwif->data_phase) { | |
622 | case TASKFILE_MULTI_OUT: | |
623 | case TASKFILE_OUT: | |
624 | case TASKFILE_MULTI_IN: | |
625 | case TASKFILE_IN: | |
626 | ide_init_sg_cmd(drive, rq); | |
627 | ide_map_sg(drive, rq); | |
628 | default: | |
629 | break; | |
630 | } | |
74095a91 | 631 | |
21d535c9 BZ |
632 | return do_rw_taskfile(drive, task); |
633 | } | |
634 | ||
1da177e4 LT |
635 | /* |
636 | * NULL is actually a valid way of waiting for | |
637 | * all current requests to be flushed from the queue. | |
638 | */ | |
639 | #ifdef DEBUG | |
640 | printk("%s: DRIVE_CMD (null)\n", drive->name); | |
641 | #endif | |
374e042c | 642 | ide_end_drive_cmd(drive, hwif->tp_ops->read_status(hwif), |
b73c7ee2 | 643 | ide_read_error(drive)); |
64a57fe4 | 644 | |
1da177e4 LT |
645 | return ide_stopped; |
646 | } | |
647 | ||
92f1f8fd EO |
648 | int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting, |
649 | int arg) | |
650 | { | |
651 | struct request_queue *q = drive->queue; | |
652 | struct request *rq; | |
653 | int ret = 0; | |
654 | ||
655 | if (!(setting->flags & DS_SYNC)) | |
656 | return setting->set(drive, arg); | |
657 | ||
658 | rq = blk_get_request(q, READ, GFP_KERNEL); | |
659 | if (!rq) | |
660 | return -ENOMEM; | |
661 | ||
662 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
663 | rq->cmd_len = 5; | |
664 | rq->cmd[0] = REQ_DEVSET_EXEC; | |
665 | *(int *)&rq->cmd[1] = arg; | |
666 | rq->special = setting->set; | |
667 | ||
668 | if (blk_execute_rq(q, NULL, rq, 0)) | |
669 | ret = rq->errors; | |
670 | blk_put_request(rq); | |
671 | ||
672 | return ret; | |
673 | } | |
674 | EXPORT_SYMBOL_GPL(ide_devset_execute); | |
675 | ||
79e36a9f EO |
676 | static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
677 | { | |
678 | switch (rq->cmd[0]) { | |
92f1f8fd EO |
679 | case REQ_DEVSET_EXEC: |
680 | { | |
681 | int err, (*setfunc)(ide_drive_t *, int) = rq->special; | |
682 | ||
683 | err = setfunc(drive, *(int *)&rq->cmd[1]); | |
684 | if (err) | |
685 | rq->errors = err; | |
686 | else | |
687 | err = 1; | |
688 | ide_end_request(drive, err, 0); | |
689 | return ide_stopped; | |
690 | } | |
79e36a9f EO |
691 | case REQ_DRIVE_RESET: |
692 | return ide_do_reset(drive); | |
693 | default: | |
694 | blk_dump_rq_flags(rq, "ide_special_rq - bad request"); | |
695 | ide_end_request(drive, 0, 0); | |
696 | return ide_stopped; | |
697 | } | |
698 | } | |
699 | ||
ad3cadda JA |
700 | static void ide_check_pm_state(ide_drive_t *drive, struct request *rq) |
701 | { | |
c00895ab | 702 | struct request_pm_state *pm = rq->data; |
ad3cadda JA |
703 | |
704 | if (blk_pm_suspend_request(rq) && | |
0d346ba0 | 705 | pm->pm_step == IDE_PM_START_SUSPEND) |
ad3cadda | 706 | /* Mark drive blocked when starting the suspend sequence. */ |
97100fc8 | 707 | drive->dev_flags |= IDE_DFLAG_BLOCKED; |
ad3cadda | 708 | else if (blk_pm_resume_request(rq) && |
0d346ba0 | 709 | pm->pm_step == IDE_PM_START_RESUME) { |
ad3cadda JA |
710 | /* |
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 | |
716 | * point. | |
717 | */ | |
6e6afb3b | 718 | ide_hwif_t *hwif = drive->hwif; |
ad3cadda JA |
719 | int rc; |
720 | #ifdef DEBUG_PM | |
721 | printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name); | |
722 | #endif | |
6e6afb3b | 723 | rc = ide_wait_not_busy(hwif, 35000); |
ad3cadda JA |
724 | if (rc) |
725 | printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name); | |
726 | SELECT_DRIVE(drive); | |
374e042c | 727 | hwif->tp_ops->set_irq(hwif, 1); |
6e6afb3b | 728 | rc = ide_wait_not_busy(hwif, 100000); |
ad3cadda JA |
729 | if (rc) |
730 | printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name); | |
731 | } | |
732 | } | |
733 | ||
1da177e4 LT |
734 | /** |
735 | * start_request - start of I/O and command issuing for IDE | |
736 | * | |
737 | * start_request() initiates handling of a new I/O request. It | |
3c619ffd | 738 | * accepts commands and I/O (read/write) requests. |
1da177e4 LT |
739 | * |
740 | * FIXME: this function needs a rename | |
741 | */ | |
742 | ||
743 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) | |
744 | { | |
745 | ide_startstop_t startstop; | |
1da177e4 | 746 | |
4aff5e23 | 747 | BUG_ON(!blk_rq_started(rq)); |
1da177e4 LT |
748 | |
749 | #ifdef DEBUG | |
750 | printk("%s: start_request: current=0x%08lx\n", | |
751 | HWIF(drive)->name, (unsigned long) rq); | |
752 | #endif | |
753 | ||
754 | /* bail early if we've exceeded max_failures */ | |
755 | if (drive->max_failures && (drive->failures > drive->max_failures)) { | |
b5e1a4e2 | 756 | rq->cmd_flags |= REQ_FAILED; |
1da177e4 LT |
757 | goto kill_rq; |
758 | } | |
759 | ||
ad3cadda JA |
760 | if (blk_pm_request(rq)) |
761 | ide_check_pm_state(drive, rq); | |
1da177e4 LT |
762 | |
763 | SELECT_DRIVE(drive); | |
3a7d2484 BZ |
764 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
765 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { | |
1da177e4 LT |
766 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
767 | return startstop; | |
768 | } | |
769 | if (!drive->special.all) { | |
770 | ide_driver_t *drv; | |
771 | ||
513daadd SS |
772 | /* |
773 | * We reset the drive so we need to issue a SETFEATURES. | |
774 | * Do it _after_ do_special() restored device parameters. | |
775 | */ | |
776 | if (drive->current_speed == 0xff) | |
777 | ide_config_drive_speed(drive, drive->desired_speed); | |
778 | ||
7267c337 | 779 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
1da177e4 LT |
780 | return execute_drive_cmd(drive, rq); |
781 | else if (blk_pm_request(rq)) { | |
c00895ab | 782 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
783 | #ifdef DEBUG_PM |
784 | printk("%s: start_power_step(step: %d)\n", | |
785 | drive->name, rq->pm->pm_step); | |
786 | #endif | |
787 | startstop = ide_start_power_step(drive, rq); | |
788 | if (startstop == ide_stopped && | |
0d346ba0 | 789 | pm->pm_step == IDE_PM_COMPLETED) |
1da177e4 LT |
790 | ide_complete_pm_request(drive, rq); |
791 | return startstop; | |
79e36a9f EO |
792 | } else if (!rq->rq_disk && blk_special_request(rq)) |
793 | /* | |
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 | |
799 | * dropped entirely. | |
800 | */ | |
801 | return ide_special_rq(drive, rq); | |
1da177e4 LT |
802 | |
803 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
3c619ffd BZ |
804 | |
805 | return drv->do_request(drive, rq, rq->sector); | |
1da177e4 LT |
806 | } |
807 | return do_special(drive); | |
808 | kill_rq: | |
809 | ide_kill_rq(drive, rq); | |
810 | return ide_stopped; | |
811 | } | |
812 | ||
813 | /** | |
814 | * ide_stall_queue - pause an IDE device | |
815 | * @drive: drive to stall | |
816 | * @timeout: time to stall for (jiffies) | |
817 | * | |
818 | * ide_stall_queue() can be used by a drive to give excess bandwidth back | |
819 | * to the hwgroup by sleeping for timeout jiffies. | |
820 | */ | |
821 | ||
822 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) | |
823 | { | |
824 | if (timeout > WAIT_WORSTCASE) | |
825 | timeout = WAIT_WORSTCASE; | |
826 | drive->sleep = timeout + jiffies; | |
97100fc8 | 827 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
1da177e4 LT |
828 | } |
829 | ||
830 | EXPORT_SYMBOL(ide_stall_queue); | |
831 | ||
832 | #define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time) | |
833 | ||
834 | /** | |
835 | * choose_drive - select a drive to service | |
836 | * @hwgroup: hardware group to select on | |
837 | * | |
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. | |
841 | */ | |
842 | ||
843 | static inline ide_drive_t *choose_drive (ide_hwgroup_t *hwgroup) | |
844 | { | |
845 | ide_drive_t *drive, *best; | |
846 | ||
847 | repeat: | |
848 | best = NULL; | |
849 | drive = hwgroup->drive; | |
850 | ||
851 | /* | |
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 | |
855 | */ | |
856 | if (blk_queue_flushing(drive->queue)) { | |
857 | /* | |
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 | |
861 | */ | |
862 | blk_remove_plug(drive->queue); | |
863 | return drive; | |
864 | } | |
865 | ||
866 | do { | |
97100fc8 BZ |
867 | u8 dev_s = !!(drive->dev_flags & IDE_DFLAG_SLEEPING); |
868 | u8 best_s = (best && !!(best->dev_flags & IDE_DFLAG_SLEEPING)); | |
869 | ||
870 | if ((dev_s == 0 || time_after_eq(jiffies, drive->sleep)) && | |
871 | !elv_queue_empty(drive->queue)) { | |
872 | if (best == NULL || | |
873 | (dev_s && (best_s == 0 || time_before(drive->sleep, best->sleep))) || | |
874 | (best_s == 0 && time_before(WAKEUP(drive), WAKEUP(best)))) { | |
1da177e4 LT |
875 | if (!blk_queue_plugged(drive->queue)) |
876 | best = drive; | |
877 | } | |
878 | } | |
879 | } while ((drive = drive->next) != hwgroup->drive); | |
97100fc8 BZ |
880 | |
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) { | |
1da177e4 LT |
884 | long t = (signed long)(WAKEUP(best) - jiffies); |
885 | if (t >= WAIT_MIN_SLEEP) { | |
886 | /* | |
887 | * We *may* have some time to spare, but first let's see if | |
888 | * someone can potentially benefit from our nice mood today.. | |
889 | */ | |
890 | drive = best->next; | |
891 | do { | |
97100fc8 | 892 | if ((drive->dev_flags & IDE_DFLAG_SLEEPING) == 0 |
1da177e4 LT |
893 | && time_before(jiffies - best->service_time, WAKEUP(drive)) |
894 | && time_before(WAKEUP(drive), jiffies + t)) | |
895 | { | |
896 | ide_stall_queue(best, min_t(long, t, 10 * WAIT_MIN_SLEEP)); | |
897 | goto repeat; | |
898 | } | |
899 | } while ((drive = drive->next) != best); | |
900 | } | |
901 | } | |
902 | return best; | |
903 | } | |
904 | ||
905 | /* | |
906 | * Issue a new request to a drive from hwgroup | |
907 | * Caller must have already done spin_lock_irqsave(&ide_lock, ..); | |
908 | * | |
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. | |
914 | * | |
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. | |
918 | * | |
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. | |
921 | * | |
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. | |
925 | * | |
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". | |
930 | * | |
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. | |
934 | * | |
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. | |
939 | */ | |
940 | static void ide_do_request (ide_hwgroup_t *hwgroup, int masked_irq) | |
941 | { | |
942 | ide_drive_t *drive; | |
943 | ide_hwif_t *hwif; | |
944 | struct request *rq; | |
945 | ide_startstop_t startstop; | |
867f8b4e | 946 | int loops = 0; |
1da177e4 LT |
947 | |
948 | /* for atari only: POSSIBLY BROKEN HERE(?) */ | |
949 | ide_get_lock(ide_intr, hwgroup); | |
950 | ||
951 | /* caller must own ide_lock */ | |
952 | BUG_ON(!irqs_disabled()); | |
953 | ||
954 | while (!hwgroup->busy) { | |
955 | hwgroup->busy = 1; | |
956 | drive = choose_drive(hwgroup); | |
957 | if (drive == NULL) { | |
958 | int sleeping = 0; | |
959 | unsigned long sleep = 0; /* shut up, gcc */ | |
960 | hwgroup->rq = NULL; | |
961 | drive = hwgroup->drive; | |
962 | do { | |
97100fc8 BZ |
963 | if ((drive->dev_flags & IDE_DFLAG_SLEEPING) && |
964 | (sleeping == 0 || | |
965 | time_before(drive->sleep, sleep))) { | |
1da177e4 LT |
966 | sleeping = 1; |
967 | sleep = drive->sleep; | |
968 | } | |
969 | } while ((drive = drive->next) != hwgroup->drive); | |
970 | if (sleeping) { | |
971 | /* | |
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. | |
976 | */ | |
977 | if (time_before(sleep, jiffies + WAIT_MIN_SLEEP)) | |
978 | sleep = jiffies + WAIT_MIN_SLEEP; | |
979 | #if 1 | |
980 | if (timer_pending(&hwgroup->timer)) | |
981 | printk(KERN_CRIT "ide_set_handler: timer already active\n"); | |
982 | #endif | |
983 | /* so that ide_timer_expiry knows what to do */ | |
984 | hwgroup->sleeping = 1; | |
23450319 | 985 | hwgroup->req_gen_timer = hwgroup->req_gen; |
1da177e4 LT |
986 | mod_timer(&hwgroup->timer, sleep); |
987 | /* we purposely leave hwgroup->busy==1 | |
988 | * while sleeping */ | |
989 | } else { | |
990 | /* Ugly, but how can we sleep for the lock | |
991 | * otherwise? perhaps from tq_disk? | |
992 | */ | |
993 | ||
994 | /* for atari only */ | |
995 | ide_release_lock(); | |
996 | hwgroup->busy = 0; | |
997 | } | |
998 | ||
999 | /* no more work for this hwgroup (for now) */ | |
1000 | return; | |
1001 | } | |
867f8b4e | 1002 | again: |
1da177e4 | 1003 | hwif = HWIF(drive); |
81ca6919 | 1004 | if (hwgroup->hwif->sharing_irq && hwif != hwgroup->hwif) { |
7299a391 BZ |
1005 | /* |
1006 | * set nIEN for previous hwif, drives in the | |
1007 | * quirk_list may not like intr setups/cleanups | |
1008 | */ | |
1009 | if (drive->quirk_list != 1) | |
374e042c | 1010 | hwif->tp_ops->set_irq(hwif, 0); |
1da177e4 LT |
1011 | } |
1012 | hwgroup->hwif = hwif; | |
1013 | hwgroup->drive = drive; | |
97100fc8 | 1014 | drive->dev_flags &= ~IDE_DFLAG_SLEEPING; |
1da177e4 LT |
1015 | drive->service_start = jiffies; |
1016 | ||
1017 | if (blk_queue_plugged(drive->queue)) { | |
1018 | printk(KERN_ERR "ide: huh? queue was plugged!\n"); | |
1019 | break; | |
1020 | } | |
1021 | ||
1022 | /* | |
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 | |
1025 | */ | |
1026 | rq = elv_next_request(drive->queue); | |
1027 | if (!rq) { | |
1028 | hwgroup->busy = 0; | |
1029 | break; | |
1030 | } | |
1031 | ||
1032 | /* | |
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... | |
1039 | * | |
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 | |
1043 | * state machine. | |
867f8b4e BH |
1044 | * |
1045 | * We count how many times we loop here to make sure we service | |
1046 | * all drives in the hwgroup without looping for ever | |
1da177e4 | 1047 | */ |
97100fc8 BZ |
1048 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
1049 | blk_pm_request(rq) == 0 && | |
1050 | (rq->cmd_flags & REQ_PREEMPT) == 0) { | |
867f8b4e BH |
1051 | drive = drive->next ? drive->next : hwgroup->drive; |
1052 | if (loops++ < 4 && !blk_queue_plugged(drive->queue)) | |
1053 | goto again; | |
1da177e4 LT |
1054 | /* We clear busy, there should be no pending ATA command at this point. */ |
1055 | hwgroup->busy = 0; | |
1056 | break; | |
1057 | } | |
1058 | ||
1059 | hwgroup->rq = rq; | |
1060 | ||
1061 | /* | |
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. | |
1068 | */ | |
1069 | if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq) | |
1070 | disable_irq_nosync(hwif->irq); | |
1071 | spin_unlock(&ide_lock); | |
366c7f55 | 1072 | local_irq_enable_in_hardirq(); |
1da177e4 LT |
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) | |
1079 | hwgroup->busy = 0; | |
1080 | } | |
1081 | } | |
1082 | ||
1083 | /* | |
1084 | * Passes the stuff to ide_do_request | |
1085 | */ | |
165125e1 | 1086 | void do_ide_request(struct request_queue *q) |
1da177e4 LT |
1087 | { |
1088 | ide_drive_t *drive = q->queuedata; | |
1089 | ||
1090 | ide_do_request(HWGROUP(drive), IDE_NO_IRQ); | |
1091 | } | |
1092 | ||
1093 | /* | |
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 | |
1096 | * all away | |
1097 | */ | |
1098 | static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error) | |
1099 | { | |
1100 | ide_hwif_t *hwif = HWIF(drive); | |
1101 | struct request *rq; | |
1102 | ide_startstop_t ret = ide_stopped; | |
1103 | ||
1104 | /* | |
1105 | * end current dma transaction | |
1106 | */ | |
1107 | ||
1108 | if (error < 0) { | |
1109 | printk(KERN_WARNING "%s: DMA timeout error\n", drive->name); | |
5e37bdc0 | 1110 | (void)hwif->dma_ops->dma_end(drive); |
1da177e4 | 1111 | ret = ide_error(drive, "dma timeout error", |
374e042c | 1112 | hwif->tp_ops->read_status(hwif)); |
1da177e4 LT |
1113 | } else { |
1114 | printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name); | |
5e37bdc0 | 1115 | hwif->dma_ops->dma_timeout(drive); |
1da177e4 LT |
1116 | } |
1117 | ||
1118 | /* | |
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. | |
1122 | */ | |
c3922048 | 1123 | drive->dev_flags |= IDE_DFLAG_DMA_PIO_RETRY; |
1da177e4 | 1124 | drive->retry_pio++; |
4a546e04 | 1125 | ide_dma_off_quietly(drive); |
1da177e4 LT |
1126 | |
1127 | /* | |
1128 | * un-busy drive etc (hwgroup->busy is cleared on return) and | |
1129 | * make sure request is sane | |
1130 | */ | |
1131 | rq = HWGROUP(drive)->rq; | |
ce42f191 HZ |
1132 | |
1133 | if (!rq) | |
1134 | goto out; | |
1135 | ||
1da177e4 LT |
1136 | HWGROUP(drive)->rq = NULL; |
1137 | ||
1138 | rq->errors = 0; | |
1139 | ||
1140 | if (!rq->bio) | |
1141 | goto out; | |
1142 | ||
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); | |
1147 | out: | |
1148 | return ret; | |
1149 | } | |
1150 | ||
1151 | /** | |
1152 | * ide_timer_expiry - handle lack of an IDE interrupt | |
1153 | * @data: timer callback magic (hwgroup) | |
1154 | * | |
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. | |
1163 | */ | |
1164 | ||
1165 | void ide_timer_expiry (unsigned long data) | |
1166 | { | |
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; | |
1172 | ||
1173 | spin_lock_irqsave(&ide_lock, flags); | |
1174 | ||
23450319 SS |
1175 | if (((handler = hwgroup->handler) == NULL) || |
1176 | (hwgroup->req_gen != hwgroup->req_gen_timer)) { | |
1da177e4 LT |
1177 | /* |
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. | |
1182 | */ | |
1183 | if (hwgroup->sleeping) { | |
1184 | hwgroup->sleeping = 0; | |
1185 | hwgroup->busy = 0; | |
1186 | } | |
1187 | } else { | |
1188 | ide_drive_t *drive = hwgroup->drive; | |
1189 | if (!drive) { | |
1190 | printk(KERN_ERR "ide_timer_expiry: hwgroup->drive was NULL\n"); | |
1191 | hwgroup->handler = NULL; | |
1192 | } else { | |
1193 | ide_hwif_t *hwif; | |
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); | |
1198 | } | |
1199 | if ((expiry = hwgroup->expiry) != NULL) { | |
1200 | /* continue */ | |
1201 | if ((wait = expiry(drive)) > 0) { | |
1202 | /* reset timer */ | |
1203 | hwgroup->timer.expires = jiffies + wait; | |
23450319 | 1204 | hwgroup->req_gen_timer = hwgroup->req_gen; |
1da177e4 LT |
1205 | add_timer(&hwgroup->timer); |
1206 | spin_unlock_irqrestore(&ide_lock, flags); | |
1207 | return; | |
1208 | } | |
1209 | } | |
1210 | hwgroup->handler = NULL; | |
1211 | /* | |
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: | |
1215 | */ | |
1216 | spin_unlock(&ide_lock); | |
1217 | hwif = HWIF(drive); | |
1da177e4 LT |
1218 | /* disable_irq_nosync ?? */ |
1219 | disable_irq(hwif->irq); | |
1da177e4 LT |
1220 | /* local CPU only, |
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) | |
5e37bdc0 | 1227 | hwif->dma_ops->dma_lost_irq(drive); |
1da177e4 LT |
1228 | (void)ide_ack_intr(hwif); |
1229 | printk(KERN_WARNING "%s: lost interrupt\n", drive->name); | |
1230 | startstop = handler(drive); | |
1231 | } else { | |
1232 | if (drive->waiting_for_dma) { | |
1233 | startstop = ide_dma_timeout_retry(drive, wait); | |
1234 | } else | |
1235 | startstop = | |
c47137a9 | 1236 | ide_error(drive, "irq timeout", |
374e042c | 1237 | hwif->tp_ops->read_status(hwif)); |
1da177e4 LT |
1238 | } |
1239 | drive->service_time = jiffies - drive->service_start; | |
1240 | spin_lock_irq(&ide_lock); | |
1241 | enable_irq(hwif->irq); | |
1242 | if (startstop == ide_stopped) | |
1243 | hwgroup->busy = 0; | |
1244 | } | |
1245 | } | |
1246 | ide_do_request(hwgroup, IDE_NO_IRQ); | |
1247 | spin_unlock_irqrestore(&ide_lock, flags); | |
1248 | } | |
1249 | ||
1250 | /** | |
1251 | * unexpected_intr - handle an unexpected IDE interrupt | |
1252 | * @irq: interrupt line | |
1253 | * @hwgroup: hwgroup being processed | |
1254 | * | |
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. | |
1259 | * | |
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. | |
1263 | * | |
1264 | * This routine assumes __cli() is in effect when called. | |
1265 | * | |
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 | |
1269 | * irq15. | |
1270 | * | |
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 | |
1276 | * interrupt. | |
1277 | * | |
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 | |
1280 | * mysteriously. | |
1281 | */ | |
1282 | ||
1283 | static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup) | |
1284 | { | |
1285 | u8 stat; | |
1286 | ide_hwif_t *hwif = hwgroup->hwif; | |
1287 | ||
1288 | /* | |
1289 | * handle the unexpected interrupt | |
1290 | */ | |
1291 | do { | |
1292 | if (hwif->irq == irq) { | |
374e042c | 1293 | stat = hwif->tp_ops->read_status(hwif); |
b73c7ee2 | 1294 | |
3a7d2484 | 1295 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { |
1da177e4 LT |
1296 | /* Try to not flood the console with msgs */ |
1297 | static unsigned long last_msgtime, count; | |
1298 | ++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", | |
1303 | hwif->name, | |
1304 | (hwif->next==hwgroup->hwif) ? "" : "(?)", stat, count); | |
1305 | } | |
1306 | } | |
1307 | } | |
1308 | } while ((hwif = hwif->next) != hwgroup->hwif); | |
1309 | } | |
1310 | ||
1311 | /** | |
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 | |
1316 | * | |
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 | |
1319 | * places | |
1320 | * | |
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. | |
1330 | * | |
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. | |
1334 | */ | |
1335 | ||
7d12e780 | 1336 | irqreturn_t ide_intr (int irq, void *dev_id) |
1da177e4 LT |
1337 | { |
1338 | unsigned long flags; | |
1339 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id; | |
1340 | ide_hwif_t *hwif; | |
1341 | ide_drive_t *drive; | |
1342 | ide_handler_t *handler; | |
1343 | ide_startstop_t startstop; | |
1344 | ||
1345 | spin_lock_irqsave(&ide_lock, flags); | |
1346 | hwif = hwgroup->hwif; | |
1347 | ||
1348 | if (!ide_ack_intr(hwif)) { | |
1349 | spin_unlock_irqrestore(&ide_lock, flags); | |
1350 | return IRQ_NONE; | |
1351 | } | |
1352 | ||
1353 | if ((handler = hwgroup->handler) == NULL || hwgroup->polling) { | |
1354 | /* | |
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. | |
1362 | * | |
1363 | * For PCI, we cannot tell the difference, | |
1364 | * so in that case we just ignore it and hope it goes away. | |
1365 | * | |
1366 | * FIXME: unexpected_intr should be hwif-> then we can | |
1367 | * remove all the ifdef PCI crap | |
1368 | */ | |
1369 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
425afb61 | 1370 | if (hwif->chipset != ide_pci) |
1da177e4 LT |
1371 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
1372 | { | |
1373 | /* | |
1374 | * Probably not a shared PCI interrupt, | |
1375 | * so we can safely try to do something about it: | |
1376 | */ | |
1377 | unexpected_intr(irq, hwgroup); | |
1378 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
1379 | } else { | |
1380 | /* | |
1381 | * Whack the status register, just in case | |
1382 | * we have a leftover pending IRQ. | |
1383 | */ | |
374e042c | 1384 | (void)hwif->tp_ops->read_status(hwif); |
1da177e4 LT |
1385 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
1386 | } | |
1387 | spin_unlock_irqrestore(&ide_lock, flags); | |
1388 | return IRQ_NONE; | |
1389 | } | |
1390 | drive = hwgroup->drive; | |
1391 | if (!drive) { | |
1392 | /* | |
1393 | * This should NEVER happen, and there isn't much | |
1394 | * we could do about it here. | |
1395 | * | |
1396 | * [Note - this can occur if the drive is hot unplugged] | |
1397 | */ | |
1398 | spin_unlock_irqrestore(&ide_lock, flags); | |
1399 | return IRQ_HANDLED; | |
1400 | } | |
1401 | if (!drive_is_ready(drive)) { | |
1402 | /* | |
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. | |
1408 | */ | |
1409 | spin_unlock_irqrestore(&ide_lock, flags); | |
1410 | return IRQ_NONE; | |
1411 | } | |
1412 | if (!hwgroup->busy) { | |
1413 | hwgroup->busy = 1; /* paranoia */ | |
1414 | printk(KERN_ERR "%s: ide_intr: hwgroup->busy was 0 ??\n", drive->name); | |
1415 | } | |
1416 | hwgroup->handler = NULL; | |
23450319 | 1417 | hwgroup->req_gen++; |
1da177e4 LT |
1418 | del_timer(&hwgroup->timer); |
1419 | spin_unlock(&ide_lock); | |
1420 | ||
bfa7d8e5 BZ |
1421 | if (hwif->port_ops && hwif->port_ops->clear_irq) |
1422 | hwif->port_ops->clear_irq(drive); | |
f0dd8712 | 1423 | |
97100fc8 | 1424 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
366c7f55 | 1425 | local_irq_enable_in_hardirq(); |
bfa7d8e5 | 1426 | |
1da177e4 LT |
1427 | /* service this interrupt, may set handler for next interrupt */ |
1428 | startstop = handler(drive); | |
1da177e4 | 1429 | |
bfa7d8e5 | 1430 | spin_lock_irq(&ide_lock); |
1da177e4 LT |
1431 | /* |
1432 | * Note that handler() may have set things up for another | |
1433 | * interrupt to occur soon, but it cannot happen until | |
1434 | * we exit from this routine, because it will be the | |
1435 | * same irq as is currently being serviced here, and Linux | |
1436 | * won't allow another of the same (on any CPU) until we return. | |
1437 | */ | |
1438 | drive->service_time = jiffies - drive->service_start; | |
1439 | if (startstop == ide_stopped) { | |
1440 | if (hwgroup->handler == NULL) { /* paranoia */ | |
1441 | hwgroup->busy = 0; | |
1442 | ide_do_request(hwgroup, hwif->irq); | |
1443 | } else { | |
1444 | printk(KERN_ERR "%s: ide_intr: huh? expected NULL handler " | |
1445 | "on exit\n", drive->name); | |
1446 | } | |
1447 | } | |
1448 | spin_unlock_irqrestore(&ide_lock, flags); | |
1449 | return IRQ_HANDLED; | |
1450 | } | |
1451 | ||
1da177e4 LT |
1452 | /** |
1453 | * ide_do_drive_cmd - issue IDE special command | |
1454 | * @drive: device to issue command | |
1455 | * @rq: request to issue | |
1da177e4 LT |
1456 | * |
1457 | * This function issues a special IDE device request | |
1458 | * onto the request queue. | |
1459 | * | |
63f5abb0 FT |
1460 | * the rq is queued at the head of the request queue, displacing |
1461 | * the currently-being-processed request and this function | |
1462 | * returns immediately without waiting for the new rq to be | |
1463 | * completed. This is VERY DANGEROUS, and is intended for | |
1464 | * careful use by the ATAPI tape/cdrom driver code. | |
1da177e4 | 1465 | */ |
63f5abb0 FT |
1466 | |
1467 | void ide_do_drive_cmd(ide_drive_t *drive, struct request *rq) | |
1da177e4 LT |
1468 | { |
1469 | unsigned long flags; | |
1470 | ide_hwgroup_t *hwgroup = HWGROUP(drive); | |
e8a96aa7 | 1471 | |
1da177e4 | 1472 | spin_lock_irqsave(&ide_lock, flags); |
63f5abb0 FT |
1473 | hwgroup->rq = NULL; |
1474 | __elv_add_request(drive->queue, rq, ELEVATOR_INSERT_FRONT, 1); | |
c6866a6f | 1475 | __generic_unplug_device(drive->queue); |
1da177e4 | 1476 | spin_unlock_irqrestore(&ide_lock, flags); |
1da177e4 LT |
1477 | } |
1478 | ||
1479 | EXPORT_SYMBOL(ide_do_drive_cmd); | |
2fc57388 BZ |
1480 | |
1481 | void ide_pktcmd_tf_load(ide_drive_t *drive, u32 tf_flags, u16 bcount, u8 dma) | |
1482 | { | |
6e6afb3b | 1483 | ide_hwif_t *hwif = drive->hwif; |
2fc57388 BZ |
1484 | ide_task_t task; |
1485 | ||
1486 | memset(&task, 0, sizeof(task)); | |
1487 | task.tf_flags = IDE_TFLAG_OUT_LBAH | IDE_TFLAG_OUT_LBAM | | |
1488 | IDE_TFLAG_OUT_FEATURE | tf_flags; | |
1489 | task.tf.feature = dma; /* Use PIO/DMA */ | |
1490 | task.tf.lbam = bcount & 0xff; | |
1491 | task.tf.lbah = (bcount >> 8) & 0xff; | |
1492 | ||
089c5c7e | 1493 | ide_tf_dump(drive->name, &task.tf); |
374e042c | 1494 | hwif->tp_ops->set_irq(hwif, 1); |
ed4af48f | 1495 | SELECT_MASK(drive, 0); |
374e042c | 1496 | hwif->tp_ops->tf_load(drive, &task); |
2fc57388 BZ |
1497 | } |
1498 | ||
1499 | EXPORT_SYMBOL_GPL(ide_pktcmd_tf_load); | |
9f87abe8 BZ |
1500 | |
1501 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) | |
1502 | { | |
1503 | ide_hwif_t *hwif = drive->hwif; | |
1504 | u8 buf[4] = { 0 }; | |
1505 | ||
1506 | while (len > 0) { | |
1507 | if (write) | |
374e042c | 1508 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
9f87abe8 | 1509 | else |
374e042c | 1510 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
9f87abe8 BZ |
1511 | len -= 4; |
1512 | } | |
1513 | } | |
1514 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |