Commit | Line | Data |
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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 | 60 | { |
a72b2147 | 61 | unsigned long flags; |
1da177e4 | 62 | int ret = 1; |
5e36bb6e KU |
63 | int error = 0; |
64 | ||
65 | if (uptodate <= 0) | |
66 | error = uptodate ? uptodate : -EIO; | |
1da177e4 | 67 | |
1da177e4 LT |
68 | /* |
69 | * if failfast is set on a request, override number of sectors and | |
70 | * complete the whole request right now | |
71 | */ | |
5e36bb6e | 72 | if (blk_noretry_request(rq) && error) |
41e9d344 | 73 | nr_bytes = rq->hard_nr_sectors << 9; |
1da177e4 | 74 | |
5e36bb6e | 75 | if (!blk_fs_request(rq) && error && !rq->errors) |
1da177e4 LT |
76 | rq->errors = -EIO; |
77 | ||
78 | /* | |
79 | * decide whether to reenable DMA -- 3 is a random magic for now, | |
80 | * if we DMA timeout more than 3 times, just stay in PIO | |
81 | */ | |
c3922048 BZ |
82 | if ((drive->dev_flags & IDE_DFLAG_DMA_PIO_RETRY) && |
83 | drive->retry_pio <= 3) { | |
84 | drive->dev_flags &= ~IDE_DFLAG_DMA_PIO_RETRY; | |
4a546e04 | 85 | ide_dma_on(drive); |
1da177e4 LT |
86 | } |
87 | ||
a72b2147 BZ |
88 | spin_lock_irqsave(&ide_lock, flags); |
89 | if (!__blk_end_request(rq, error, nr_bytes)) | |
1da177e4 | 90 | ret = 0; |
a72b2147 BZ |
91 | spin_unlock_irqrestore(&ide_lock, flags); |
92 | ||
93 | if (ret == 0 && dequeue) | |
94 | drive->hwif->hwgroup->rq = NULL; | |
8672d571 | 95 | |
1da177e4 LT |
96 | return ret; |
97 | } | |
1da177e4 LT |
98 | |
99 | /** | |
100 | * ide_end_request - complete an IDE I/O | |
101 | * @drive: IDE device for the I/O | |
102 | * @uptodate: | |
103 | * @nr_sectors: number of sectors completed | |
104 | * | |
105 | * This is our end_request wrapper function. We complete the I/O | |
106 | * update random number input and dequeue the request, which if | |
107 | * it was tagged may be out of order. | |
108 | */ | |
109 | ||
110 | int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors) | |
111 | { | |
41e9d344 | 112 | unsigned int nr_bytes = nr_sectors << 9; |
1d0bf587 | 113 | struct request *rq = drive->hwif->hwgroup->rq; |
1da177e4 | 114 | |
41e9d344 JA |
115 | if (!nr_bytes) { |
116 | if (blk_pc_request(rq)) | |
117 | nr_bytes = rq->data_len; | |
118 | else | |
119 | nr_bytes = rq->hard_cur_sectors << 9; | |
120 | } | |
1da177e4 | 121 | |
a72b2147 | 122 | return __ide_end_request(drive, rq, uptodate, nr_bytes, 1); |
1da177e4 LT |
123 | } |
124 | EXPORT_SYMBOL(ide_end_request); | |
125 | ||
6b7d8fc3 | 126 | static void ide_complete_power_step(ide_drive_t *drive, struct request *rq) |
1da177e4 | 127 | { |
c00895ab | 128 | struct request_pm_state *pm = rq->data; |
ad3cadda | 129 | |
6b7d8fc3 BZ |
130 | #ifdef DEBUG_PM |
131 | printk(KERN_INFO "%s: complete_power_step(step: %d)\n", | |
132 | drive->name, pm->pm_step); | |
133 | #endif | |
1da177e4 LT |
134 | if (drive->media != ide_disk) |
135 | return; | |
136 | ||
ad3cadda | 137 | switch (pm->pm_step) { |
0d346ba0 | 138 | case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */ |
ad3cadda | 139 | if (pm->pm_state == PM_EVENT_FREEZE) |
0d346ba0 | 140 | pm->pm_step = IDE_PM_COMPLETED; |
1da177e4 | 141 | else |
0d346ba0 | 142 | pm->pm_step = IDE_PM_STANDBY; |
1da177e4 | 143 | break; |
0d346ba0 BZ |
144 | case IDE_PM_STANDBY: /* Suspend step 2 (standby) */ |
145 | pm->pm_step = IDE_PM_COMPLETED; | |
1da177e4 | 146 | break; |
0d346ba0 BZ |
147 | case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */ |
148 | pm->pm_step = IDE_PM_IDLE; | |
8c2c0118 | 149 | break; |
0d346ba0 BZ |
150 | case IDE_PM_IDLE: /* Resume step 2 (idle)*/ |
151 | pm->pm_step = IDE_PM_RESTORE_DMA; | |
1da177e4 LT |
152 | break; |
153 | } | |
154 | } | |
155 | ||
156 | static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq) | |
157 | { | |
c00895ab | 158 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
159 | ide_task_t *args = rq->special; |
160 | ||
161 | memset(args, 0, sizeof(*args)); | |
162 | ||
ad3cadda | 163 | switch (pm->pm_step) { |
0d346ba0 | 164 | case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */ |
1da177e4 LT |
165 | if (drive->media != ide_disk) |
166 | break; | |
167 | /* Not supported? Switch to next step now. */ | |
97100fc8 BZ |
168 | if (ata_id_flush_enabled(drive->id) == 0 || |
169 | (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) { | |
6b7d8fc3 | 170 | ide_complete_power_step(drive, rq); |
1da177e4 LT |
171 | return ide_stopped; |
172 | } | |
ff2779b5 | 173 | if (ata_id_flush_ext_enabled(drive->id)) |
aaaade3f | 174 | args->tf.command = ATA_CMD_FLUSH_EXT; |
1da177e4 | 175 | else |
aaaade3f | 176 | args->tf.command = ATA_CMD_FLUSH; |
74095a91 | 177 | goto out_do_tf; |
0d346ba0 | 178 | case IDE_PM_STANDBY: /* Suspend step 2 (standby) */ |
aaaade3f | 179 | args->tf.command = ATA_CMD_STANDBYNOW1; |
74095a91 | 180 | goto out_do_tf; |
0d346ba0 | 181 | case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */ |
26bcb879 | 182 | ide_set_max_pio(drive); |
317a46a2 | 183 | /* |
0d346ba0 | 184 | * skip IDE_PM_IDLE for ATAPI devices |
317a46a2 BZ |
185 | */ |
186 | if (drive->media != ide_disk) | |
0d346ba0 | 187 | pm->pm_step = IDE_PM_RESTORE_DMA; |
317a46a2 | 188 | else |
6b7d8fc3 | 189 | ide_complete_power_step(drive, rq); |
8c2c0118 | 190 | return ide_stopped; |
0d346ba0 | 191 | case IDE_PM_IDLE: /* Resume step 2 (idle) */ |
aaaade3f | 192 | args->tf.command = ATA_CMD_IDLEIMMEDIATE; |
74095a91 | 193 | goto out_do_tf; |
0d346ba0 | 194 | case IDE_PM_RESTORE_DMA: /* Resume step 3 (restore DMA) */ |
1da177e4 | 195 | /* |
0ae2e178 | 196 | * Right now, all we do is call ide_set_dma(drive), |
1da177e4 LT |
197 | * we could be smarter and check for current xfer_speed |
198 | * in struct drive etc... | |
199 | */ | |
5e37bdc0 | 200 | if (drive->hwif->dma_ops == NULL) |
1da177e4 | 201 | break; |
1a659880 BZ |
202 | /* |
203 | * TODO: respect IDE_DFLAG_USING_DMA | |
204 | */ | |
205 | ide_set_dma(drive); | |
1da177e4 LT |
206 | break; |
207 | } | |
0d346ba0 BZ |
208 | |
209 | pm->pm_step = IDE_PM_COMPLETED; | |
1da177e4 | 210 | return ide_stopped; |
74095a91 BZ |
211 | |
212 | out_do_tf: | |
657cc1a8 | 213 | args->tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE; |
ac026ff2 | 214 | args->data_phase = TASKFILE_NO_DATA; |
74095a91 | 215 | return do_rw_taskfile(drive, args); |
1da177e4 LT |
216 | } |
217 | ||
dbe217af AC |
218 | /** |
219 | * ide_end_dequeued_request - complete an IDE I/O | |
220 | * @drive: IDE device for the I/O | |
221 | * @uptodate: | |
222 | * @nr_sectors: number of sectors completed | |
223 | * | |
224 | * Complete an I/O that is no longer on the request queue. This | |
225 | * typically occurs when we pull the request and issue a REQUEST_SENSE. | |
226 | * We must still finish the old request but we must not tamper with the | |
227 | * queue in the meantime. | |
228 | * | |
229 | * NOTE: This path does not handle barrier, but barrier is not supported | |
230 | * on ide-cd anyway. | |
231 | */ | |
232 | ||
233 | int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq, | |
234 | int uptodate, int nr_sectors) | |
235 | { | |
4aff5e23 | 236 | BUG_ON(!blk_rq_started(rq)); |
1d0bf587 | 237 | |
a72b2147 | 238 | return __ide_end_request(drive, rq, uptodate, nr_sectors << 9, 0); |
dbe217af AC |
239 | } |
240 | EXPORT_SYMBOL_GPL(ide_end_dequeued_request); | |
241 | ||
242 | ||
1da177e4 LT |
243 | /** |
244 | * ide_complete_pm_request - end the current Power Management request | |
245 | * @drive: target drive | |
246 | * @rq: request | |
247 | * | |
248 | * This function cleans up the current PM request and stops the queue | |
249 | * if necessary. | |
250 | */ | |
251 | static void ide_complete_pm_request (ide_drive_t *drive, struct request *rq) | |
252 | { | |
253 | unsigned long flags; | |
254 | ||
255 | #ifdef DEBUG_PM | |
256 | printk("%s: completing PM request, %s\n", drive->name, | |
257 | blk_pm_suspend_request(rq) ? "suspend" : "resume"); | |
258 | #endif | |
259 | spin_lock_irqsave(&ide_lock, flags); | |
260 | if (blk_pm_suspend_request(rq)) { | |
261 | blk_stop_queue(drive->queue); | |
262 | } else { | |
97100fc8 | 263 | drive->dev_flags &= ~IDE_DFLAG_BLOCKED; |
1da177e4 LT |
264 | blk_start_queue(drive->queue); |
265 | } | |
1d0bf587 BZ |
266 | spin_unlock_irqrestore(&ide_lock, flags); |
267 | ||
268 | drive->hwif->hwgroup->rq = NULL; | |
269 | ||
270 | spin_lock_irqsave(&ide_lock, flags); | |
5e36bb6e KU |
271 | if (__blk_end_request(rq, 0, 0)) |
272 | BUG(); | |
1da177e4 LT |
273 | spin_unlock_irqrestore(&ide_lock, flags); |
274 | } | |
275 | ||
1da177e4 LT |
276 | /** |
277 | * ide_end_drive_cmd - end an explicit drive command | |
278 | * @drive: command | |
279 | * @stat: status bits | |
280 | * @err: error bits | |
281 | * | |
282 | * Clean up after success/failure of an explicit drive command. | |
283 | * These get thrown onto the queue so they are synchronized with | |
284 | * real I/O operations on the drive. | |
285 | * | |
286 | * In LBA48 mode we have to read the register set twice to get | |
287 | * all the extra information out. | |
288 | */ | |
289 | ||
290 | void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err) | |
291 | { | |
1d0bf587 BZ |
292 | ide_hwgroup_t *hwgroup = drive->hwif->hwgroup; |
293 | struct request *rq = hwgroup->rq; | |
1da177e4 | 294 | unsigned long flags; |
1da177e4 | 295 | |
7267c337 | 296 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
395d8ef5 BZ |
297 | ide_task_t *task = (ide_task_t *)rq->special; |
298 | ||
1da177e4 | 299 | if (rq->errors == 0) |
3a7d2484 | 300 | rq->errors = !OK_STAT(stat, ATA_DRDY, BAD_STAT); |
395d8ef5 BZ |
301 | |
302 | if (task) { | |
303 | struct ide_taskfile *tf = &task->tf; | |
650d841d | 304 | |
650d841d | 305 | tf->error = err; |
650d841d | 306 | tf->status = stat; |
1da177e4 | 307 | |
374e042c | 308 | drive->hwif->tp_ops->tf_read(drive, task); |
395d8ef5 BZ |
309 | |
310 | if (task->tf_flags & IDE_TFLAG_DYN) | |
311 | kfree(task); | |
1da177e4 LT |
312 | } |
313 | } else if (blk_pm_request(rq)) { | |
c00895ab | 314 | struct request_pm_state *pm = rq->data; |
6b7d8fc3 BZ |
315 | |
316 | ide_complete_power_step(drive, rq); | |
0d346ba0 | 317 | if (pm->pm_step == IDE_PM_COMPLETED) |
1da177e4 LT |
318 | ide_complete_pm_request(drive, rq); |
319 | return; | |
320 | } | |
321 | ||
1d0bf587 BZ |
322 | hwgroup->rq = NULL; |
323 | ||
1da177e4 | 324 | rq->errors = err; |
1d0bf587 BZ |
325 | |
326 | spin_lock_irqsave(&ide_lock, flags); | |
3b0e044d KU |
327 | if (unlikely(__blk_end_request(rq, (rq->errors ? -EIO : 0), |
328 | blk_rq_bytes(rq)))) | |
5e36bb6e | 329 | BUG(); |
1da177e4 LT |
330 | spin_unlock_irqrestore(&ide_lock, flags); |
331 | } | |
1da177e4 LT |
332 | EXPORT_SYMBOL(ide_end_drive_cmd); |
333 | ||
1da177e4 LT |
334 | static void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
335 | { | |
336 | if (rq->rq_disk) { | |
337 | ide_driver_t *drv; | |
338 | ||
339 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
340 | drv->end_request(drive, 0, 0); | |
341 | } else | |
342 | ide_end_request(drive, 0, 0); | |
343 | } | |
344 | ||
345 | static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
346 | { | |
347 | ide_hwif_t *hwif = drive->hwif; | |
348 | ||
97100fc8 BZ |
349 | if ((stat & ATA_BUSY) || |
350 | ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { | |
1da177e4 LT |
351 | /* other bits are useless when BUSY */ |
352 | rq->errors |= ERROR_RESET; | |
3a7d2484 | 353 | } else if (stat & ATA_ERR) { |
1da177e4 | 354 | /* err has different meaning on cdrom and tape */ |
3a7d2484 | 355 | if (err == ATA_ABORTED) { |
d1d76714 | 356 | if ((drive->dev_flags & IDE_DFLAG_LBA) && |
aaaade3f BZ |
357 | /* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */ |
358 | hwif->tp_ops->read_status(hwif) == ATA_CMD_INIT_DEV_PARAMS) | |
1da177e4 LT |
359 | return ide_stopped; |
360 | } else if ((err & BAD_CRC) == BAD_CRC) { | |
361 | /* UDMA crc error, just retry the operation */ | |
362 | drive->crc_count++; | |
3a7d2484 | 363 | } else if (err & (ATA_BBK | ATA_UNC)) { |
1da177e4 LT |
364 | /* retries won't help these */ |
365 | rq->errors = ERROR_MAX; | |
3a7d2484 | 366 | } else if (err & ATA_TRK0NF) { |
1da177e4 LT |
367 | /* help it find track zero */ |
368 | rq->errors |= ERROR_RECAL; | |
369 | } | |
370 | } | |
371 | ||
3a7d2484 | 372 | if ((stat & ATA_DRQ) && rq_data_dir(rq) == READ && |
57279a7a BZ |
373 | (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) { |
374 | int nsect = drive->mult_count ? drive->mult_count : 1; | |
375 | ||
376 | ide_pad_transfer(drive, READ, nsect * SECTOR_SIZE); | |
377 | } | |
1da177e4 | 378 | |
513daadd SS |
379 | if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) { |
380 | ide_kill_rq(drive, rq); | |
381 | return ide_stopped; | |
382 | } | |
383 | ||
3a7d2484 | 384 | if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) |
513daadd | 385 | rq->errors |= ERROR_RESET; |
1da177e4 | 386 | |
513daadd | 387 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { |
1da177e4 | 388 | ++rq->errors; |
513daadd | 389 | return ide_do_reset(drive); |
1da177e4 | 390 | } |
513daadd SS |
391 | |
392 | if ((rq->errors & ERROR_RECAL) == ERROR_RECAL) | |
393 | drive->special.b.recalibrate = 1; | |
394 | ||
395 | ++rq->errors; | |
396 | ||
1da177e4 LT |
397 | return ide_stopped; |
398 | } | |
399 | ||
400 | static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
401 | { | |
402 | ide_hwif_t *hwif = drive->hwif; | |
403 | ||
97100fc8 BZ |
404 | if ((stat & ATA_BUSY) || |
405 | ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { | |
1da177e4 LT |
406 | /* other bits are useless when BUSY */ |
407 | rq->errors |= ERROR_RESET; | |
408 | } else { | |
409 | /* add decoding error stuff */ | |
410 | } | |
411 | ||
3a7d2484 | 412 | if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) |
1da177e4 | 413 | /* force an abort */ |
aaaade3f | 414 | hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE); |
1da177e4 LT |
415 | |
416 | if (rq->errors >= ERROR_MAX) { | |
417 | ide_kill_rq(drive, rq); | |
418 | } else { | |
419 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { | |
420 | ++rq->errors; | |
421 | return ide_do_reset(drive); | |
422 | } | |
423 | ++rq->errors; | |
424 | } | |
425 | ||
426 | return ide_stopped; | |
427 | } | |
428 | ||
429 | ide_startstop_t | |
430 | __ide_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
431 | { | |
432 | if (drive->media == ide_disk) | |
433 | return ide_ata_error(drive, rq, stat, err); | |
434 | return ide_atapi_error(drive, rq, stat, err); | |
435 | } | |
436 | ||
437 | EXPORT_SYMBOL_GPL(__ide_error); | |
438 | ||
439 | /** | |
440 | * ide_error - handle an error on the IDE | |
441 | * @drive: drive the error occurred on | |
442 | * @msg: message to report | |
443 | * @stat: status bits | |
444 | * | |
445 | * ide_error() takes action based on the error returned by the drive. | |
446 | * For normal I/O that may well include retries. We deal with | |
447 | * both new-style (taskfile) and old style command handling here. | |
448 | * In the case of taskfile command handling there is work left to | |
449 | * do | |
450 | */ | |
451 | ||
452 | ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat) | |
453 | { | |
454 | struct request *rq; | |
455 | u8 err; | |
456 | ||
457 | err = ide_dump_status(drive, msg, stat); | |
458 | ||
459 | if ((rq = HWGROUP(drive)->rq) == NULL) | |
460 | return ide_stopped; | |
461 | ||
462 | /* retry only "normal" I/O: */ | |
4aff5e23 | 463 | if (!blk_fs_request(rq)) { |
1da177e4 LT |
464 | rq->errors = 1; |
465 | ide_end_drive_cmd(drive, stat, err); | |
466 | return ide_stopped; | |
467 | } | |
468 | ||
469 | if (rq->rq_disk) { | |
470 | ide_driver_t *drv; | |
471 | ||
472 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
473 | return drv->error(drive, rq, stat, err); | |
474 | } else | |
475 | return __ide_error(drive, rq, stat, err); | |
476 | } | |
477 | ||
478 | EXPORT_SYMBOL_GPL(ide_error); | |
479 | ||
57d7366b | 480 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 481 | { |
57d7366b BZ |
482 | tf->nsect = drive->sect; |
483 | tf->lbal = drive->sect; | |
484 | tf->lbam = drive->cyl; | |
485 | tf->lbah = drive->cyl >> 8; | |
7f612f27 | 486 | tf->device = (drive->head - 1) | drive->select; |
aaaade3f | 487 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
1da177e4 LT |
488 | } |
489 | ||
57d7366b | 490 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 491 | { |
57d7366b | 492 | tf->nsect = drive->sect; |
aaaade3f | 493 | tf->command = ATA_CMD_RESTORE; |
1da177e4 LT |
494 | } |
495 | ||
57d7366b | 496 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 497 | { |
57d7366b | 498 | tf->nsect = drive->mult_req; |
aaaade3f | 499 | tf->command = ATA_CMD_SET_MULTI; |
1da177e4 LT |
500 | } |
501 | ||
502 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) | |
503 | { | |
504 | special_t *s = &drive->special; | |
505 | ide_task_t args; | |
506 | ||
507 | memset(&args, 0, sizeof(ide_task_t)); | |
ac026ff2 | 508 | args.data_phase = TASKFILE_NO_DATA; |
1da177e4 LT |
509 | |
510 | if (s->b.set_geometry) { | |
511 | s->b.set_geometry = 0; | |
57d7366b | 512 | ide_tf_set_specify_cmd(drive, &args.tf); |
1da177e4 LT |
513 | } else if (s->b.recalibrate) { |
514 | s->b.recalibrate = 0; | |
57d7366b | 515 | ide_tf_set_restore_cmd(drive, &args.tf); |
1da177e4 LT |
516 | } else if (s->b.set_multmode) { |
517 | s->b.set_multmode = 0; | |
57d7366b | 518 | ide_tf_set_setmult_cmd(drive, &args.tf); |
1da177e4 LT |
519 | } else if (s->all) { |
520 | int special = s->all; | |
521 | s->all = 0; | |
522 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); | |
523 | return ide_stopped; | |
524 | } | |
525 | ||
657cc1a8 | 526 | args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
57d7366b | 527 | IDE_TFLAG_CUSTOM_HANDLER; |
74095a91 | 528 | |
1da177e4 LT |
529 | do_rw_taskfile(drive, &args); |
530 | ||
531 | return ide_started; | |
532 | } | |
533 | ||
534 | /** | |
535 | * do_special - issue some special commands | |
536 | * @drive: drive the command is for | |
537 | * | |
aaaade3f BZ |
538 | * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, |
539 | * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. | |
540 | * | |
541 | * It used to do much more, but has been scaled back. | |
1da177e4 LT |
542 | */ |
543 | ||
544 | static ide_startstop_t do_special (ide_drive_t *drive) | |
545 | { | |
546 | special_t *s = &drive->special; | |
547 | ||
548 | #ifdef DEBUG | |
549 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); | |
550 | #endif | |
6982daf7 BZ |
551 | if (drive->media == ide_disk) |
552 | return ide_disk_special(drive); | |
1da177e4 | 553 | |
6982daf7 BZ |
554 | s->all = 0; |
555 | drive->mult_req = 0; | |
556 | return ide_stopped; | |
1da177e4 LT |
557 | } |
558 | ||
559 | void ide_map_sg(ide_drive_t *drive, struct request *rq) | |
560 | { | |
561 | ide_hwif_t *hwif = drive->hwif; | |
562 | struct scatterlist *sg = hwif->sg_table; | |
563 | ||
564 | if (hwif->sg_mapped) /* needed by ide-scsi */ | |
565 | return; | |
566 | ||
4aff5e23 | 567 | if (rq->cmd_type != REQ_TYPE_ATA_TASKFILE) { |
1da177e4 LT |
568 | hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); |
569 | } else { | |
570 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); | |
571 | hwif->sg_nents = 1; | |
572 | } | |
573 | } | |
574 | ||
575 | EXPORT_SYMBOL_GPL(ide_map_sg); | |
576 | ||
577 | void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq) | |
578 | { | |
579 | ide_hwif_t *hwif = drive->hwif; | |
580 | ||
581 | hwif->nsect = hwif->nleft = rq->nr_sectors; | |
55c16a70 JA |
582 | hwif->cursg_ofs = 0; |
583 | hwif->cursg = NULL; | |
1da177e4 LT |
584 | } |
585 | ||
586 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); | |
587 | ||
588 | /** | |
589 | * execute_drive_command - issue special drive command | |
338cec32 | 590 | * @drive: the drive to issue the command on |
1da177e4 LT |
591 | * @rq: the request structure holding the command |
592 | * | |
593 | * execute_drive_cmd() issues a special drive command, usually | |
594 | * initiated by ioctl() from the external hdparm program. The | |
595 | * command can be a drive command, drive task or taskfile | |
596 | * operation. Weirdly you can call it with NULL to wait for | |
597 | * all commands to finish. Don't do this as that is due to change | |
598 | */ | |
599 | ||
600 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, | |
601 | struct request *rq) | |
602 | { | |
603 | ide_hwif_t *hwif = HWIF(drive); | |
7267c337 | 604 | ide_task_t *task = rq->special; |
1da177e4 | 605 | |
7267c337 | 606 | if (task) { |
21d535c9 | 607 | hwif->data_phase = task->data_phase; |
1da177e4 LT |
608 | |
609 | switch (hwif->data_phase) { | |
610 | case TASKFILE_MULTI_OUT: | |
611 | case TASKFILE_OUT: | |
612 | case TASKFILE_MULTI_IN: | |
613 | case TASKFILE_IN: | |
614 | ide_init_sg_cmd(drive, rq); | |
615 | ide_map_sg(drive, rq); | |
616 | default: | |
617 | break; | |
618 | } | |
74095a91 | 619 | |
21d535c9 BZ |
620 | return do_rw_taskfile(drive, task); |
621 | } | |
622 | ||
1da177e4 LT |
623 | /* |
624 | * NULL is actually a valid way of waiting for | |
625 | * all current requests to be flushed from the queue. | |
626 | */ | |
627 | #ifdef DEBUG | |
628 | printk("%s: DRIVE_CMD (null)\n", drive->name); | |
629 | #endif | |
374e042c | 630 | ide_end_drive_cmd(drive, hwif->tp_ops->read_status(hwif), |
b73c7ee2 | 631 | ide_read_error(drive)); |
64a57fe4 | 632 | |
1da177e4 LT |
633 | return ide_stopped; |
634 | } | |
635 | ||
92f1f8fd EO |
636 | int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting, |
637 | int arg) | |
638 | { | |
639 | struct request_queue *q = drive->queue; | |
640 | struct request *rq; | |
641 | int ret = 0; | |
642 | ||
643 | if (!(setting->flags & DS_SYNC)) | |
644 | return setting->set(drive, arg); | |
645 | ||
e415e495 | 646 | rq = blk_get_request(q, READ, __GFP_WAIT); |
92f1f8fd EO |
647 | rq->cmd_type = REQ_TYPE_SPECIAL; |
648 | rq->cmd_len = 5; | |
649 | rq->cmd[0] = REQ_DEVSET_EXEC; | |
650 | *(int *)&rq->cmd[1] = arg; | |
651 | rq->special = setting->set; | |
652 | ||
653 | if (blk_execute_rq(q, NULL, rq, 0)) | |
654 | ret = rq->errors; | |
655 | blk_put_request(rq); | |
656 | ||
657 | return ret; | |
658 | } | |
659 | EXPORT_SYMBOL_GPL(ide_devset_execute); | |
660 | ||
79e36a9f EO |
661 | static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
662 | { | |
4abdc6ee EO |
663 | u8 cmd = rq->cmd[0]; |
664 | ||
665 | if (cmd == REQ_PARK_HEADS || cmd == REQ_UNPARK_HEADS) { | |
666 | ide_task_t task; | |
667 | struct ide_taskfile *tf = &task.tf; | |
668 | ||
669 | memset(&task, 0, sizeof(task)); | |
670 | if (cmd == REQ_PARK_HEADS) { | |
671 | drive->sleep = *(unsigned long *)rq->special; | |
672 | drive->dev_flags |= IDE_DFLAG_SLEEPING; | |
673 | tf->command = ATA_CMD_IDLEIMMEDIATE; | |
674 | tf->feature = 0x44; | |
675 | tf->lbal = 0x4c; | |
676 | tf->lbam = 0x4e; | |
677 | tf->lbah = 0x55; | |
678 | task.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER; | |
679 | } else /* cmd == REQ_UNPARK_HEADS */ | |
680 | tf->command = ATA_CMD_CHK_POWER; | |
681 | ||
682 | task.tf_flags |= IDE_TFLAG_TF | IDE_TFLAG_DEVICE; | |
683 | task.rq = rq; | |
684 | drive->hwif->data_phase = task.data_phase = TASKFILE_NO_DATA; | |
685 | return do_rw_taskfile(drive, &task); | |
686 | } | |
687 | ||
688 | switch (cmd) { | |
92f1f8fd EO |
689 | case REQ_DEVSET_EXEC: |
690 | { | |
691 | int err, (*setfunc)(ide_drive_t *, int) = rq->special; | |
692 | ||
693 | err = setfunc(drive, *(int *)&rq->cmd[1]); | |
694 | if (err) | |
695 | rq->errors = err; | |
696 | else | |
697 | err = 1; | |
698 | ide_end_request(drive, err, 0); | |
699 | return ide_stopped; | |
700 | } | |
79e36a9f EO |
701 | case REQ_DRIVE_RESET: |
702 | return ide_do_reset(drive); | |
703 | default: | |
704 | blk_dump_rq_flags(rq, "ide_special_rq - bad request"); | |
705 | ide_end_request(drive, 0, 0); | |
706 | return ide_stopped; | |
707 | } | |
708 | } | |
709 | ||
ad3cadda JA |
710 | static void ide_check_pm_state(ide_drive_t *drive, struct request *rq) |
711 | { | |
c00895ab | 712 | struct request_pm_state *pm = rq->data; |
ad3cadda JA |
713 | |
714 | if (blk_pm_suspend_request(rq) && | |
0d346ba0 | 715 | pm->pm_step == IDE_PM_START_SUSPEND) |
ad3cadda | 716 | /* Mark drive blocked when starting the suspend sequence. */ |
97100fc8 | 717 | drive->dev_flags |= IDE_DFLAG_BLOCKED; |
ad3cadda | 718 | else if (blk_pm_resume_request(rq) && |
0d346ba0 | 719 | pm->pm_step == IDE_PM_START_RESUME) { |
ad3cadda JA |
720 | /* |
721 | * The first thing we do on wakeup is to wait for BSY bit to | |
722 | * go away (with a looong timeout) as a drive on this hwif may | |
723 | * just be POSTing itself. | |
724 | * We do that before even selecting as the "other" device on | |
725 | * the bus may be broken enough to walk on our toes at this | |
726 | * point. | |
727 | */ | |
6e6afb3b | 728 | ide_hwif_t *hwif = drive->hwif; |
ad3cadda JA |
729 | int rc; |
730 | #ifdef DEBUG_PM | |
731 | printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name); | |
732 | #endif | |
6e6afb3b | 733 | rc = ide_wait_not_busy(hwif, 35000); |
ad3cadda JA |
734 | if (rc) |
735 | printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name); | |
736 | SELECT_DRIVE(drive); | |
374e042c | 737 | hwif->tp_ops->set_irq(hwif, 1); |
6e6afb3b | 738 | rc = ide_wait_not_busy(hwif, 100000); |
ad3cadda JA |
739 | if (rc) |
740 | printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name); | |
741 | } | |
742 | } | |
743 | ||
1da177e4 LT |
744 | /** |
745 | * start_request - start of I/O and command issuing for IDE | |
746 | * | |
747 | * start_request() initiates handling of a new I/O request. It | |
3c619ffd | 748 | * accepts commands and I/O (read/write) requests. |
1da177e4 LT |
749 | * |
750 | * FIXME: this function needs a rename | |
751 | */ | |
752 | ||
753 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) | |
754 | { | |
755 | ide_startstop_t startstop; | |
1da177e4 | 756 | |
4aff5e23 | 757 | BUG_ON(!blk_rq_started(rq)); |
1da177e4 LT |
758 | |
759 | #ifdef DEBUG | |
760 | printk("%s: start_request: current=0x%08lx\n", | |
761 | HWIF(drive)->name, (unsigned long) rq); | |
762 | #endif | |
763 | ||
764 | /* bail early if we've exceeded max_failures */ | |
765 | if (drive->max_failures && (drive->failures > drive->max_failures)) { | |
b5e1a4e2 | 766 | rq->cmd_flags |= REQ_FAILED; |
1da177e4 LT |
767 | goto kill_rq; |
768 | } | |
769 | ||
ad3cadda JA |
770 | if (blk_pm_request(rq)) |
771 | ide_check_pm_state(drive, rq); | |
1da177e4 LT |
772 | |
773 | SELECT_DRIVE(drive); | |
3a7d2484 BZ |
774 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
775 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { | |
1da177e4 LT |
776 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
777 | return startstop; | |
778 | } | |
779 | if (!drive->special.all) { | |
780 | ide_driver_t *drv; | |
781 | ||
513daadd SS |
782 | /* |
783 | * We reset the drive so we need to issue a SETFEATURES. | |
784 | * Do it _after_ do_special() restored device parameters. | |
785 | */ | |
786 | if (drive->current_speed == 0xff) | |
787 | ide_config_drive_speed(drive, drive->desired_speed); | |
788 | ||
7267c337 | 789 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
1da177e4 LT |
790 | return execute_drive_cmd(drive, rq); |
791 | else if (blk_pm_request(rq)) { | |
c00895ab | 792 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
793 | #ifdef DEBUG_PM |
794 | printk("%s: start_power_step(step: %d)\n", | |
6b7d8fc3 | 795 | drive->name, pm->pm_step); |
1da177e4 LT |
796 | #endif |
797 | startstop = ide_start_power_step(drive, rq); | |
798 | if (startstop == ide_stopped && | |
0d346ba0 | 799 | pm->pm_step == IDE_PM_COMPLETED) |
1da177e4 LT |
800 | ide_complete_pm_request(drive, rq); |
801 | return startstop; | |
79e36a9f EO |
802 | } else if (!rq->rq_disk && blk_special_request(rq)) |
803 | /* | |
804 | * TODO: Once all ULDs have been modified to | |
805 | * check for specific op codes rather than | |
806 | * blindly accepting any special request, the | |
807 | * check for ->rq_disk above may be replaced | |
808 | * by a more suitable mechanism or even | |
809 | * dropped entirely. | |
810 | */ | |
811 | return ide_special_rq(drive, rq); | |
1da177e4 LT |
812 | |
813 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
3c619ffd BZ |
814 | |
815 | return drv->do_request(drive, rq, rq->sector); | |
1da177e4 LT |
816 | } |
817 | return do_special(drive); | |
818 | kill_rq: | |
819 | ide_kill_rq(drive, rq); | |
820 | return ide_stopped; | |
821 | } | |
822 | ||
823 | /** | |
824 | * ide_stall_queue - pause an IDE device | |
825 | * @drive: drive to stall | |
826 | * @timeout: time to stall for (jiffies) | |
827 | * | |
828 | * ide_stall_queue() can be used by a drive to give excess bandwidth back | |
829 | * to the hwgroup by sleeping for timeout jiffies. | |
830 | */ | |
831 | ||
832 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) | |
833 | { | |
834 | if (timeout > WAIT_WORSTCASE) | |
835 | timeout = WAIT_WORSTCASE; | |
836 | drive->sleep = timeout + jiffies; | |
97100fc8 | 837 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
1da177e4 LT |
838 | } |
839 | ||
840 | EXPORT_SYMBOL(ide_stall_queue); | |
841 | ||
842 | #define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time) | |
843 | ||
844 | /** | |
845 | * choose_drive - select a drive to service | |
846 | * @hwgroup: hardware group to select on | |
847 | * | |
848 | * choose_drive() selects the next drive which will be serviced. | |
849 | * This is necessary because the IDE layer can't issue commands | |
850 | * to both drives on the same cable, unlike SCSI. | |
851 | */ | |
852 | ||
853 | static inline ide_drive_t *choose_drive (ide_hwgroup_t *hwgroup) | |
854 | { | |
855 | ide_drive_t *drive, *best; | |
856 | ||
857 | repeat: | |
858 | best = NULL; | |
859 | drive = hwgroup->drive; | |
860 | ||
861 | /* | |
862 | * drive is doing pre-flush, ordered write, post-flush sequence. even | |
863 | * though that is 3 requests, it must be seen as a single transaction. | |
864 | * we must not preempt this drive until that is complete | |
865 | */ | |
866 | if (blk_queue_flushing(drive->queue)) { | |
867 | /* | |
868 | * small race where queue could get replugged during | |
869 | * the 3-request flush cycle, just yank the plug since | |
870 | * we want it to finish asap | |
871 | */ | |
872 | blk_remove_plug(drive->queue); | |
873 | return drive; | |
874 | } | |
875 | ||
876 | do { | |
97100fc8 BZ |
877 | u8 dev_s = !!(drive->dev_flags & IDE_DFLAG_SLEEPING); |
878 | u8 best_s = (best && !!(best->dev_flags & IDE_DFLAG_SLEEPING)); | |
879 | ||
880 | if ((dev_s == 0 || time_after_eq(jiffies, drive->sleep)) && | |
881 | !elv_queue_empty(drive->queue)) { | |
882 | if (best == NULL || | |
883 | (dev_s && (best_s == 0 || time_before(drive->sleep, best->sleep))) || | |
884 | (best_s == 0 && time_before(WAKEUP(drive), WAKEUP(best)))) { | |
1da177e4 LT |
885 | if (!blk_queue_plugged(drive->queue)) |
886 | best = drive; | |
887 | } | |
888 | } | |
889 | } while ((drive = drive->next) != hwgroup->drive); | |
97100fc8 BZ |
890 | |
891 | if (best && (best->dev_flags & IDE_DFLAG_NICE1) && | |
892 | (best->dev_flags & IDE_DFLAG_SLEEPING) == 0 && | |
893 | best != hwgroup->drive && best->service_time > WAIT_MIN_SLEEP) { | |
1da177e4 LT |
894 | long t = (signed long)(WAKEUP(best) - jiffies); |
895 | if (t >= WAIT_MIN_SLEEP) { | |
896 | /* | |
897 | * We *may* have some time to spare, but first let's see if | |
898 | * someone can potentially benefit from our nice mood today.. | |
899 | */ | |
900 | drive = best->next; | |
901 | do { | |
97100fc8 | 902 | if ((drive->dev_flags & IDE_DFLAG_SLEEPING) == 0 |
1da177e4 LT |
903 | && time_before(jiffies - best->service_time, WAKEUP(drive)) |
904 | && time_before(WAKEUP(drive), jiffies + t)) | |
905 | { | |
906 | ide_stall_queue(best, min_t(long, t, 10 * WAIT_MIN_SLEEP)); | |
907 | goto repeat; | |
908 | } | |
909 | } while ((drive = drive->next) != best); | |
910 | } | |
911 | } | |
912 | return best; | |
913 | } | |
914 | ||
915 | /* | |
916 | * Issue a new request to a drive from hwgroup | |
917 | * Caller must have already done spin_lock_irqsave(&ide_lock, ..); | |
918 | * | |
919 | * A hwgroup is a serialized group of IDE interfaces. Usually there is | |
920 | * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640) | |
921 | * may have both interfaces in a single hwgroup to "serialize" access. | |
922 | * Or possibly multiple ISA interfaces can share a common IRQ by being grouped | |
923 | * together into one hwgroup for serialized access. | |
924 | * | |
925 | * Note also that several hwgroups can end up sharing a single IRQ, | |
926 | * possibly along with many other devices. This is especially common in | |
927 | * PCI-based systems with off-board IDE controller cards. | |
928 | * | |
929 | * The IDE driver uses the single global ide_lock spinlock to protect | |
930 | * access to the request queues, and to protect the hwgroup->busy flag. | |
931 | * | |
932 | * The first thread into the driver for a particular hwgroup sets the | |
933 | * hwgroup->busy flag to indicate that this hwgroup is now active, | |
934 | * and then initiates processing of the top request from the request queue. | |
935 | * | |
936 | * Other threads attempting entry notice the busy setting, and will simply | |
937 | * queue their new requests and exit immediately. Note that hwgroup->busy | |
938 | * remains set even when the driver is merely awaiting the next interrupt. | |
939 | * Thus, the meaning is "this hwgroup is busy processing a request". | |
940 | * | |
941 | * When processing of a request completes, the completing thread or IRQ-handler | |
942 | * will start the next request from the queue. If no more work remains, | |
943 | * the driver will clear the hwgroup->busy flag and exit. | |
944 | * | |
945 | * The ide_lock (spinlock) is used to protect all access to the | |
946 | * hwgroup->busy flag, but is otherwise not needed for most processing in | |
947 | * the driver. This makes the driver much more friendlier to shared IRQs | |
948 | * than previous designs, while remaining 100% (?) SMP safe and capable. | |
949 | */ | |
950 | static void ide_do_request (ide_hwgroup_t *hwgroup, int masked_irq) | |
951 | { | |
952 | ide_drive_t *drive; | |
953 | ide_hwif_t *hwif; | |
954 | struct request *rq; | |
955 | ide_startstop_t startstop; | |
867f8b4e | 956 | int loops = 0; |
1da177e4 | 957 | |
1da177e4 LT |
958 | /* caller must own ide_lock */ |
959 | BUG_ON(!irqs_disabled()); | |
960 | ||
961 | while (!hwgroup->busy) { | |
962 | hwgroup->busy = 1; | |
f9e3326d MS |
963 | /* for atari only */ |
964 | ide_get_lock(ide_intr, hwgroup); | |
1da177e4 LT |
965 | drive = choose_drive(hwgroup); |
966 | if (drive == NULL) { | |
967 | int sleeping = 0; | |
968 | unsigned long sleep = 0; /* shut up, gcc */ | |
969 | hwgroup->rq = NULL; | |
970 | drive = hwgroup->drive; | |
971 | do { | |
97100fc8 BZ |
972 | if ((drive->dev_flags & IDE_DFLAG_SLEEPING) && |
973 | (sleeping == 0 || | |
974 | time_before(drive->sleep, sleep))) { | |
1da177e4 LT |
975 | sleeping = 1; |
976 | sleep = drive->sleep; | |
977 | } | |
978 | } while ((drive = drive->next) != hwgroup->drive); | |
979 | if (sleeping) { | |
980 | /* | |
981 | * Take a short snooze, and then wake up this hwgroup again. | |
982 | * This gives other hwgroups on the same a chance to | |
983 | * play fairly with us, just in case there are big differences | |
984 | * in relative throughputs.. don't want to hog the cpu too much. | |
985 | */ | |
986 | if (time_before(sleep, jiffies + WAIT_MIN_SLEEP)) | |
987 | sleep = jiffies + WAIT_MIN_SLEEP; | |
988 | #if 1 | |
989 | if (timer_pending(&hwgroup->timer)) | |
990 | printk(KERN_CRIT "ide_set_handler: timer already active\n"); | |
991 | #endif | |
992 | /* so that ide_timer_expiry knows what to do */ | |
993 | hwgroup->sleeping = 1; | |
23450319 | 994 | hwgroup->req_gen_timer = hwgroup->req_gen; |
1da177e4 LT |
995 | mod_timer(&hwgroup->timer, sleep); |
996 | /* we purposely leave hwgroup->busy==1 | |
997 | * while sleeping */ | |
998 | } else { | |
999 | /* Ugly, but how can we sleep for the lock | |
1000 | * otherwise? perhaps from tq_disk? | |
1001 | */ | |
1002 | ||
1003 | /* for atari only */ | |
1004 | ide_release_lock(); | |
1005 | hwgroup->busy = 0; | |
1006 | } | |
1007 | ||
1008 | /* no more work for this hwgroup (for now) */ | |
1009 | return; | |
1010 | } | |
867f8b4e | 1011 | again: |
1da177e4 | 1012 | hwif = HWIF(drive); |
81ca6919 | 1013 | if (hwgroup->hwif->sharing_irq && hwif != hwgroup->hwif) { |
7299a391 BZ |
1014 | /* |
1015 | * set nIEN for previous hwif, drives in the | |
1016 | * quirk_list may not like intr setups/cleanups | |
1017 | */ | |
1018 | if (drive->quirk_list != 1) | |
374e042c | 1019 | hwif->tp_ops->set_irq(hwif, 0); |
1da177e4 LT |
1020 | } |
1021 | hwgroup->hwif = hwif; | |
1022 | hwgroup->drive = drive; | |
4abdc6ee | 1023 | drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED); |
1da177e4 LT |
1024 | drive->service_start = jiffies; |
1025 | ||
1026 | if (blk_queue_plugged(drive->queue)) { | |
1027 | printk(KERN_ERR "ide: huh? queue was plugged!\n"); | |
1028 | break; | |
1029 | } | |
1030 | ||
1031 | /* | |
1032 | * we know that the queue isn't empty, but this can happen | |
1033 | * if the q->prep_rq_fn() decides to kill a request | |
1034 | */ | |
1035 | rq = elv_next_request(drive->queue); | |
1036 | if (!rq) { | |
1037 | hwgroup->busy = 0; | |
1038 | break; | |
1039 | } | |
1040 | ||
1041 | /* | |
1042 | * Sanity: don't accept a request that isn't a PM request | |
1043 | * if we are currently power managed. This is very important as | |
1044 | * blk_stop_queue() doesn't prevent the elv_next_request() | |
1045 | * above to return us whatever is in the queue. Since we call | |
1046 | * ide_do_request() ourselves, we end up taking requests while | |
1047 | * the queue is blocked... | |
1048 | * | |
1049 | * We let requests forced at head of queue with ide-preempt | |
1050 | * though. I hope that doesn't happen too much, hopefully not | |
1051 | * unless the subdriver triggers such a thing in its own PM | |
1052 | * state machine. | |
867f8b4e BH |
1053 | * |
1054 | * We count how many times we loop here to make sure we service | |
1055 | * all drives in the hwgroup without looping for ever | |
1da177e4 | 1056 | */ |
97100fc8 BZ |
1057 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
1058 | blk_pm_request(rq) == 0 && | |
1059 | (rq->cmd_flags & REQ_PREEMPT) == 0) { | |
867f8b4e BH |
1060 | drive = drive->next ? drive->next : hwgroup->drive; |
1061 | if (loops++ < 4 && !blk_queue_plugged(drive->queue)) | |
1062 | goto again; | |
1da177e4 LT |
1063 | /* We clear busy, there should be no pending ATA command at this point. */ |
1064 | hwgroup->busy = 0; | |
1065 | break; | |
1066 | } | |
1067 | ||
1068 | hwgroup->rq = rq; | |
1069 | ||
1070 | /* | |
1071 | * Some systems have trouble with IDE IRQs arriving while | |
1072 | * the driver is still setting things up. So, here we disable | |
1073 | * the IRQ used by this interface while the request is being started. | |
1074 | * This may look bad at first, but pretty much the same thing | |
1075 | * happens anyway when any interrupt comes in, IDE or otherwise | |
1076 | * -- the kernel masks the IRQ while it is being handled. | |
1077 | */ | |
1078 | if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq) | |
1079 | disable_irq_nosync(hwif->irq); | |
1080 | spin_unlock(&ide_lock); | |
366c7f55 | 1081 | local_irq_enable_in_hardirq(); |
1da177e4 LT |
1082 | /* allow other IRQs while we start this request */ |
1083 | startstop = start_request(drive, rq); | |
1084 | spin_lock_irq(&ide_lock); | |
1085 | if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq) | |
1086 | enable_irq(hwif->irq); | |
1087 | if (startstop == ide_stopped) | |
1088 | hwgroup->busy = 0; | |
1089 | } | |
1090 | } | |
1091 | ||
1092 | /* | |
1093 | * Passes the stuff to ide_do_request | |
1094 | */ | |
165125e1 | 1095 | void do_ide_request(struct request_queue *q) |
1da177e4 LT |
1096 | { |
1097 | ide_drive_t *drive = q->queuedata; | |
1098 | ||
1099 | ide_do_request(HWGROUP(drive), IDE_NO_IRQ); | |
1100 | } | |
1101 | ||
1102 | /* | |
1103 | * un-busy the hwgroup etc, and clear any pending DMA status. we want to | |
1104 | * retry the current request in pio mode instead of risking tossing it | |
1105 | * all away | |
1106 | */ | |
1107 | static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error) | |
1108 | { | |
1109 | ide_hwif_t *hwif = HWIF(drive); | |
1110 | struct request *rq; | |
1111 | ide_startstop_t ret = ide_stopped; | |
1112 | ||
1113 | /* | |
1114 | * end current dma transaction | |
1115 | */ | |
1116 | ||
1117 | if (error < 0) { | |
1118 | printk(KERN_WARNING "%s: DMA timeout error\n", drive->name); | |
5e37bdc0 | 1119 | (void)hwif->dma_ops->dma_end(drive); |
1da177e4 | 1120 | ret = ide_error(drive, "dma timeout error", |
374e042c | 1121 | hwif->tp_ops->read_status(hwif)); |
1da177e4 LT |
1122 | } else { |
1123 | printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name); | |
5e37bdc0 | 1124 | hwif->dma_ops->dma_timeout(drive); |
1da177e4 LT |
1125 | } |
1126 | ||
1127 | /* | |
1128 | * disable dma for now, but remember that we did so because of | |
1129 | * a timeout -- we'll reenable after we finish this next request | |
1130 | * (or rather the first chunk of it) in pio. | |
1131 | */ | |
c3922048 | 1132 | drive->dev_flags |= IDE_DFLAG_DMA_PIO_RETRY; |
1da177e4 | 1133 | drive->retry_pio++; |
4a546e04 | 1134 | ide_dma_off_quietly(drive); |
1da177e4 LT |
1135 | |
1136 | /* | |
1137 | * un-busy drive etc (hwgroup->busy is cleared on return) and | |
1138 | * make sure request is sane | |
1139 | */ | |
1140 | rq = HWGROUP(drive)->rq; | |
ce42f191 HZ |
1141 | |
1142 | if (!rq) | |
1143 | goto out; | |
1144 | ||
1da177e4 LT |
1145 | HWGROUP(drive)->rq = NULL; |
1146 | ||
1147 | rq->errors = 0; | |
1148 | ||
1149 | if (!rq->bio) | |
1150 | goto out; | |
1151 | ||
1152 | rq->sector = rq->bio->bi_sector; | |
1153 | rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9; | |
1154 | rq->hard_cur_sectors = rq->current_nr_sectors; | |
1155 | rq->buffer = bio_data(rq->bio); | |
1156 | out: | |
1157 | return ret; | |
1158 | } | |
1159 | ||
1160 | /** | |
1161 | * ide_timer_expiry - handle lack of an IDE interrupt | |
1162 | * @data: timer callback magic (hwgroup) | |
1163 | * | |
1164 | * An IDE command has timed out before the expected drive return | |
1165 | * occurred. At this point we attempt to clean up the current | |
1166 | * mess. If the current handler includes an expiry handler then | |
1167 | * we invoke the expiry handler, and providing it is happy the | |
1168 | * work is done. If that fails we apply generic recovery rules | |
1169 | * invoking the handler and checking the drive DMA status. We | |
1170 | * have an excessively incestuous relationship with the DMA | |
1171 | * logic that wants cleaning up. | |
1172 | */ | |
1173 | ||
1174 | void ide_timer_expiry (unsigned long data) | |
1175 | { | |
1176 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data; | |
1177 | ide_handler_t *handler; | |
1178 | ide_expiry_t *expiry; | |
1179 | unsigned long flags; | |
1180 | unsigned long wait = -1; | |
1181 | ||
1182 | spin_lock_irqsave(&ide_lock, flags); | |
1183 | ||
23450319 SS |
1184 | if (((handler = hwgroup->handler) == NULL) || |
1185 | (hwgroup->req_gen != hwgroup->req_gen_timer)) { | |
1da177e4 LT |
1186 | /* |
1187 | * Either a marginal timeout occurred | |
1188 | * (got the interrupt just as timer expired), | |
1189 | * or we were "sleeping" to give other devices a chance. | |
1190 | * Either way, we don't really want to complain about anything. | |
1191 | */ | |
1192 | if (hwgroup->sleeping) { | |
1193 | hwgroup->sleeping = 0; | |
1194 | hwgroup->busy = 0; | |
1195 | } | |
1196 | } else { | |
1197 | ide_drive_t *drive = hwgroup->drive; | |
1198 | if (!drive) { | |
1199 | printk(KERN_ERR "ide_timer_expiry: hwgroup->drive was NULL\n"); | |
1200 | hwgroup->handler = NULL; | |
1201 | } else { | |
1202 | ide_hwif_t *hwif; | |
1203 | ide_startstop_t startstop = ide_stopped; | |
1204 | if (!hwgroup->busy) { | |
1205 | hwgroup->busy = 1; /* paranoia */ | |
1206 | printk(KERN_ERR "%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive->name); | |
1207 | } | |
1208 | if ((expiry = hwgroup->expiry) != NULL) { | |
1209 | /* continue */ | |
1210 | if ((wait = expiry(drive)) > 0) { | |
1211 | /* reset timer */ | |
1212 | hwgroup->timer.expires = jiffies + wait; | |
23450319 | 1213 | hwgroup->req_gen_timer = hwgroup->req_gen; |
1da177e4 LT |
1214 | add_timer(&hwgroup->timer); |
1215 | spin_unlock_irqrestore(&ide_lock, flags); | |
1216 | return; | |
1217 | } | |
1218 | } | |
1219 | hwgroup->handler = NULL; | |
1220 | /* | |
1221 | * We need to simulate a real interrupt when invoking | |
1222 | * the handler() function, which means we need to | |
1223 | * globally mask the specific IRQ: | |
1224 | */ | |
1225 | spin_unlock(&ide_lock); | |
1226 | hwif = HWIF(drive); | |
1da177e4 LT |
1227 | /* disable_irq_nosync ?? */ |
1228 | disable_irq(hwif->irq); | |
1da177e4 LT |
1229 | /* local CPU only, |
1230 | * as if we were handling an interrupt */ | |
1231 | local_irq_disable(); | |
1232 | if (hwgroup->polling) { | |
1233 | startstop = handler(drive); | |
1234 | } else if (drive_is_ready(drive)) { | |
1235 | if (drive->waiting_for_dma) | |
5e37bdc0 | 1236 | hwif->dma_ops->dma_lost_irq(drive); |
1da177e4 LT |
1237 | (void)ide_ack_intr(hwif); |
1238 | printk(KERN_WARNING "%s: lost interrupt\n", drive->name); | |
1239 | startstop = handler(drive); | |
1240 | } else { | |
1241 | if (drive->waiting_for_dma) { | |
1242 | startstop = ide_dma_timeout_retry(drive, wait); | |
1243 | } else | |
1244 | startstop = | |
c47137a9 | 1245 | ide_error(drive, "irq timeout", |
374e042c | 1246 | hwif->tp_ops->read_status(hwif)); |
1da177e4 LT |
1247 | } |
1248 | drive->service_time = jiffies - drive->service_start; | |
1249 | spin_lock_irq(&ide_lock); | |
1250 | enable_irq(hwif->irq); | |
1251 | if (startstop == ide_stopped) | |
1252 | hwgroup->busy = 0; | |
1253 | } | |
1254 | } | |
1255 | ide_do_request(hwgroup, IDE_NO_IRQ); | |
1256 | spin_unlock_irqrestore(&ide_lock, flags); | |
1257 | } | |
1258 | ||
1259 | /** | |
1260 | * unexpected_intr - handle an unexpected IDE interrupt | |
1261 | * @irq: interrupt line | |
1262 | * @hwgroup: hwgroup being processed | |
1263 | * | |
1264 | * There's nothing really useful we can do with an unexpected interrupt, | |
1265 | * other than reading the status register (to clear it), and logging it. | |
1266 | * There should be no way that an irq can happen before we're ready for it, | |
1267 | * so we needn't worry much about losing an "important" interrupt here. | |
1268 | * | |
1269 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever | |
1270 | * the drive enters "idle", "standby", or "sleep" mode, so if the status | |
1271 | * looks "good", we just ignore the interrupt completely. | |
1272 | * | |
1273 | * This routine assumes __cli() is in effect when called. | |
1274 | * | |
1275 | * If an unexpected interrupt happens on irq15 while we are handling irq14 | |
1276 | * and if the two interfaces are "serialized" (CMD640), then it looks like | |
1277 | * we could screw up by interfering with a new request being set up for | |
1278 | * irq15. | |
1279 | * | |
1280 | * In reality, this is a non-issue. The new command is not sent unless | |
1281 | * the drive is ready to accept one, in which case we know the drive is | |
1282 | * not trying to interrupt us. And ide_set_handler() is always invoked | |
1283 | * before completing the issuance of any new drive command, so we will not | |
1284 | * be accidentally invoked as a result of any valid command completion | |
1285 | * interrupt. | |
1286 | * | |
1287 | * Note that we must walk the entire hwgroup here. We know which hwif | |
1288 | * is doing the current command, but we don't know which hwif burped | |
1289 | * mysteriously. | |
1290 | */ | |
1291 | ||
1292 | static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup) | |
1293 | { | |
1294 | u8 stat; | |
1295 | ide_hwif_t *hwif = hwgroup->hwif; | |
1296 | ||
1297 | /* | |
1298 | * handle the unexpected interrupt | |
1299 | */ | |
1300 | do { | |
1301 | if (hwif->irq == irq) { | |
374e042c | 1302 | stat = hwif->tp_ops->read_status(hwif); |
b73c7ee2 | 1303 | |
3a7d2484 | 1304 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { |
1da177e4 LT |
1305 | /* Try to not flood the console with msgs */ |
1306 | static unsigned long last_msgtime, count; | |
1307 | ++count; | |
1308 | if (time_after(jiffies, last_msgtime + HZ)) { | |
1309 | last_msgtime = jiffies; | |
1310 | printk(KERN_ERR "%s%s: unexpected interrupt, " | |
1311 | "status=0x%02x, count=%ld\n", | |
1312 | hwif->name, | |
1313 | (hwif->next==hwgroup->hwif) ? "" : "(?)", stat, count); | |
1314 | } | |
1315 | } | |
1316 | } | |
1317 | } while ((hwif = hwif->next) != hwgroup->hwif); | |
1318 | } | |
1319 | ||
1320 | /** | |
1321 | * ide_intr - default IDE interrupt handler | |
1322 | * @irq: interrupt number | |
1323 | * @dev_id: hwif group | |
1324 | * @regs: unused weirdness from the kernel irq layer | |
1325 | * | |
1326 | * This is the default IRQ handler for the IDE layer. You should | |
1327 | * not need to override it. If you do be aware it is subtle in | |
1328 | * places | |
1329 | * | |
1330 | * hwgroup->hwif is the interface in the group currently performing | |
1331 | * a command. hwgroup->drive is the drive and hwgroup->handler is | |
1332 | * the IRQ handler to call. As we issue a command the handlers | |
1333 | * step through multiple states, reassigning the handler to the | |
1334 | * next step in the process. Unlike a smart SCSI controller IDE | |
1335 | * expects the main processor to sequence the various transfer | |
1336 | * stages. We also manage a poll timer to catch up with most | |
1337 | * timeout situations. There are still a few where the handlers | |
1338 | * don't ever decide to give up. | |
1339 | * | |
1340 | * The handler eventually returns ide_stopped to indicate the | |
1341 | * request completed. At this point we issue the next request | |
1342 | * on the hwgroup and the process begins again. | |
1343 | */ | |
1344 | ||
7d12e780 | 1345 | irqreturn_t ide_intr (int irq, void *dev_id) |
1da177e4 LT |
1346 | { |
1347 | unsigned long flags; | |
1348 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id; | |
1349 | ide_hwif_t *hwif; | |
1350 | ide_drive_t *drive; | |
1351 | ide_handler_t *handler; | |
1352 | ide_startstop_t startstop; | |
3e0e29f7 | 1353 | irqreturn_t irq_ret = IRQ_NONE; |
1da177e4 LT |
1354 | |
1355 | spin_lock_irqsave(&ide_lock, flags); | |
1356 | hwif = hwgroup->hwif; | |
1357 | ||
3e0e29f7 BZ |
1358 | if (!ide_ack_intr(hwif)) |
1359 | goto out; | |
1da177e4 LT |
1360 | |
1361 | if ((handler = hwgroup->handler) == NULL || hwgroup->polling) { | |
1362 | /* | |
1363 | * Not expecting an interrupt from this drive. | |
1364 | * That means this could be: | |
1365 | * (1) an interrupt from another PCI device | |
1366 | * sharing the same PCI INT# as us. | |
1367 | * or (2) a drive just entered sleep or standby mode, | |
1368 | * and is interrupting to let us know. | |
1369 | * or (3) a spurious interrupt of unknown origin. | |
1370 | * | |
1371 | * For PCI, we cannot tell the difference, | |
1372 | * so in that case we just ignore it and hope it goes away. | |
1373 | * | |
1374 | * FIXME: unexpected_intr should be hwif-> then we can | |
1375 | * remove all the ifdef PCI crap | |
1376 | */ | |
1377 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
425afb61 | 1378 | if (hwif->chipset != ide_pci) |
1da177e4 LT |
1379 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
1380 | { | |
1381 | /* | |
1382 | * Probably not a shared PCI interrupt, | |
1383 | * so we can safely try to do something about it: | |
1384 | */ | |
1385 | unexpected_intr(irq, hwgroup); | |
1386 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
1387 | } else { | |
1388 | /* | |
1389 | * Whack the status register, just in case | |
1390 | * we have a leftover pending IRQ. | |
1391 | */ | |
374e042c | 1392 | (void)hwif->tp_ops->read_status(hwif); |
1da177e4 LT |
1393 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
1394 | } | |
3e0e29f7 | 1395 | goto out; |
1da177e4 | 1396 | } |
3e0e29f7 | 1397 | |
1da177e4 LT |
1398 | drive = hwgroup->drive; |
1399 | if (!drive) { | |
1400 | /* | |
1401 | * This should NEVER happen, and there isn't much | |
1402 | * we could do about it here. | |
1403 | * | |
1404 | * [Note - this can occur if the drive is hot unplugged] | |
1405 | */ | |
3e0e29f7 | 1406 | goto out_handled; |
1da177e4 | 1407 | } |
3e0e29f7 BZ |
1408 | |
1409 | if (!drive_is_ready(drive)) | |
1da177e4 LT |
1410 | /* |
1411 | * This happens regularly when we share a PCI IRQ with | |
1412 | * another device. Unfortunately, it can also happen | |
1413 | * with some buggy drives that trigger the IRQ before | |
1414 | * their status register is up to date. Hopefully we have | |
1415 | * enough advance overhead that the latter isn't a problem. | |
1416 | */ | |
3e0e29f7 BZ |
1417 | goto out; |
1418 | ||
1da177e4 LT |
1419 | if (!hwgroup->busy) { |
1420 | hwgroup->busy = 1; /* paranoia */ | |
1421 | printk(KERN_ERR "%s: ide_intr: hwgroup->busy was 0 ??\n", drive->name); | |
1422 | } | |
1423 | hwgroup->handler = NULL; | |
23450319 | 1424 | hwgroup->req_gen++; |
1da177e4 LT |
1425 | del_timer(&hwgroup->timer); |
1426 | spin_unlock(&ide_lock); | |
1427 | ||
bfa7d8e5 BZ |
1428 | if (hwif->port_ops && hwif->port_ops->clear_irq) |
1429 | hwif->port_ops->clear_irq(drive); | |
f0dd8712 | 1430 | |
97100fc8 | 1431 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
366c7f55 | 1432 | local_irq_enable_in_hardirq(); |
bfa7d8e5 | 1433 | |
1da177e4 LT |
1434 | /* service this interrupt, may set handler for next interrupt */ |
1435 | startstop = handler(drive); | |
1da177e4 | 1436 | |
bfa7d8e5 | 1437 | spin_lock_irq(&ide_lock); |
1da177e4 LT |
1438 | /* |
1439 | * Note that handler() may have set things up for another | |
1440 | * interrupt to occur soon, but it cannot happen until | |
1441 | * we exit from this routine, because it will be the | |
1442 | * same irq as is currently being serviced here, and Linux | |
1443 | * won't allow another of the same (on any CPU) until we return. | |
1444 | */ | |
1445 | drive->service_time = jiffies - drive->service_start; | |
1446 | if (startstop == ide_stopped) { | |
1447 | if (hwgroup->handler == NULL) { /* paranoia */ | |
1448 | hwgroup->busy = 0; | |
1449 | ide_do_request(hwgroup, hwif->irq); | |
1450 | } else { | |
1451 | printk(KERN_ERR "%s: ide_intr: huh? expected NULL handler " | |
1452 | "on exit\n", drive->name); | |
1453 | } | |
1454 | } | |
3e0e29f7 BZ |
1455 | out_handled: |
1456 | irq_ret = IRQ_HANDLED; | |
1457 | out: | |
1da177e4 | 1458 | spin_unlock_irqrestore(&ide_lock, flags); |
3e0e29f7 | 1459 | return irq_ret; |
1da177e4 LT |
1460 | } |
1461 | ||
1da177e4 LT |
1462 | /** |
1463 | * ide_do_drive_cmd - issue IDE special command | |
1464 | * @drive: device to issue command | |
1465 | * @rq: request to issue | |
1da177e4 LT |
1466 | * |
1467 | * This function issues a special IDE device request | |
1468 | * onto the request queue. | |
1469 | * | |
63f5abb0 FT |
1470 | * the rq is queued at the head of the request queue, displacing |
1471 | * the currently-being-processed request and this function | |
1472 | * returns immediately without waiting for the new rq to be | |
1473 | * completed. This is VERY DANGEROUS, and is intended for | |
1474 | * careful use by the ATAPI tape/cdrom driver code. | |
1da177e4 | 1475 | */ |
63f5abb0 FT |
1476 | |
1477 | void ide_do_drive_cmd(ide_drive_t *drive, struct request *rq) | |
1da177e4 | 1478 | { |
1d0bf587 | 1479 | ide_hwgroup_t *hwgroup = drive->hwif->hwgroup; |
1da177e4 | 1480 | unsigned long flags; |
e8a96aa7 | 1481 | |
63f5abb0 | 1482 | hwgroup->rq = NULL; |
1d0bf587 BZ |
1483 | |
1484 | spin_lock_irqsave(&ide_lock, flags); | |
f73e2d13 JA |
1485 | __elv_add_request(drive->queue, rq, ELEVATOR_INSERT_FRONT, 0); |
1486 | blk_start_queueing(drive->queue); | |
1da177e4 | 1487 | spin_unlock_irqrestore(&ide_lock, flags); |
1da177e4 LT |
1488 | } |
1489 | ||
1490 | EXPORT_SYMBOL(ide_do_drive_cmd); | |
2fc57388 BZ |
1491 | |
1492 | void ide_pktcmd_tf_load(ide_drive_t *drive, u32 tf_flags, u16 bcount, u8 dma) | |
1493 | { | |
6e6afb3b | 1494 | ide_hwif_t *hwif = drive->hwif; |
2fc57388 BZ |
1495 | ide_task_t task; |
1496 | ||
1497 | memset(&task, 0, sizeof(task)); | |
1498 | task.tf_flags = IDE_TFLAG_OUT_LBAH | IDE_TFLAG_OUT_LBAM | | |
1499 | IDE_TFLAG_OUT_FEATURE | tf_flags; | |
1500 | task.tf.feature = dma; /* Use PIO/DMA */ | |
1501 | task.tf.lbam = bcount & 0xff; | |
1502 | task.tf.lbah = (bcount >> 8) & 0xff; | |
1503 | ||
089c5c7e | 1504 | ide_tf_dump(drive->name, &task.tf); |
374e042c | 1505 | hwif->tp_ops->set_irq(hwif, 1); |
ed4af48f | 1506 | SELECT_MASK(drive, 0); |
374e042c | 1507 | hwif->tp_ops->tf_load(drive, &task); |
2fc57388 BZ |
1508 | } |
1509 | ||
1510 | EXPORT_SYMBOL_GPL(ide_pktcmd_tf_load); | |
9f87abe8 BZ |
1511 | |
1512 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) | |
1513 | { | |
1514 | ide_hwif_t *hwif = drive->hwif; | |
1515 | u8 buf[4] = { 0 }; | |
1516 | ||
1517 | while (len > 0) { | |
1518 | if (write) | |
374e042c | 1519 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
9f87abe8 | 1520 | else |
374e042c | 1521 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
9f87abe8 BZ |
1522 | len -= 4; |
1523 | } | |
1524 | } | |
1525 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |