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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 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 | ||
3c8a2cce | 87 | if (!blk_end_request(rq, error, nr_bytes)) |
1da177e4 | 88 | ret = 0; |
a72b2147 BZ |
89 | |
90 | if (ret == 0 && dequeue) | |
b65fac32 | 91 | drive->hwif->rq = NULL; |
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; |
b65fac32 | 110 | struct request *rq = drive->hwif->rq; |
1da177e4 | 111 | |
41e9d344 JA |
112 | if (!nr_bytes) { |
113 | if (blk_pc_request(rq)) | |
114 | nr_bytes = rq->data_len; | |
115 | else | |
116 | nr_bytes = rq->hard_cur_sectors << 9; | |
117 | } | |
1da177e4 | 118 | |
a72b2147 | 119 | return __ide_end_request(drive, rq, uptodate, nr_bytes, 1); |
1da177e4 LT |
120 | } |
121 | EXPORT_SYMBOL(ide_end_request); | |
122 | ||
dbe217af AC |
123 | /** |
124 | * ide_end_dequeued_request - complete an IDE I/O | |
125 | * @drive: IDE device for the I/O | |
126 | * @uptodate: | |
127 | * @nr_sectors: number of sectors completed | |
128 | * | |
129 | * Complete an I/O that is no longer on the request queue. This | |
130 | * typically occurs when we pull the request and issue a REQUEST_SENSE. | |
131 | * We must still finish the old request but we must not tamper with the | |
132 | * queue in the meantime. | |
133 | * | |
134 | * NOTE: This path does not handle barrier, but barrier is not supported | |
135 | * on ide-cd anyway. | |
136 | */ | |
137 | ||
138 | int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq, | |
139 | int uptodate, int nr_sectors) | |
140 | { | |
4aff5e23 | 141 | BUG_ON(!blk_rq_started(rq)); |
1d0bf587 | 142 | |
a72b2147 | 143 | return __ide_end_request(drive, rq, uptodate, nr_sectors << 9, 0); |
dbe217af AC |
144 | } |
145 | EXPORT_SYMBOL_GPL(ide_end_dequeued_request); | |
146 | ||
1da177e4 LT |
147 | /** |
148 | * ide_end_drive_cmd - end an explicit drive command | |
149 | * @drive: command | |
150 | * @stat: status bits | |
151 | * @err: error bits | |
152 | * | |
153 | * Clean up after success/failure of an explicit drive command. | |
154 | * These get thrown onto the queue so they are synchronized with | |
155 | * real I/O operations on the drive. | |
156 | * | |
157 | * In LBA48 mode we have to read the register set twice to get | |
158 | * all the extra information out. | |
159 | */ | |
160 | ||
161 | void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err) | |
162 | { | |
b65fac32 BZ |
163 | ide_hwif_t *hwif = drive->hwif; |
164 | struct request *rq = hwif->rq; | |
1da177e4 | 165 | |
7267c337 | 166 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
395d8ef5 BZ |
167 | ide_task_t *task = (ide_task_t *)rq->special; |
168 | ||
395d8ef5 BZ |
169 | if (task) { |
170 | struct ide_taskfile *tf = &task->tf; | |
650d841d | 171 | |
650d841d | 172 | tf->error = err; |
650d841d | 173 | tf->status = stat; |
1da177e4 | 174 | |
374e042c | 175 | drive->hwif->tp_ops->tf_read(drive, task); |
395d8ef5 BZ |
176 | |
177 | if (task->tf_flags & IDE_TFLAG_DYN) | |
178 | kfree(task); | |
1da177e4 LT |
179 | } |
180 | } else if (blk_pm_request(rq)) { | |
c00895ab | 181 | struct request_pm_state *pm = rq->data; |
6b7d8fc3 BZ |
182 | |
183 | ide_complete_power_step(drive, rq); | |
0d346ba0 | 184 | if (pm->pm_step == IDE_PM_COMPLETED) |
1da177e4 LT |
185 | ide_complete_pm_request(drive, rq); |
186 | return; | |
187 | } | |
188 | ||
b65fac32 | 189 | hwif->rq = NULL; |
1d0bf587 | 190 | |
1da177e4 | 191 | rq->errors = err; |
1d0bf587 | 192 | |
3c8a2cce BZ |
193 | if (unlikely(blk_end_request(rq, (rq->errors ? -EIO : 0), |
194 | blk_rq_bytes(rq)))) | |
5e36bb6e | 195 | BUG(); |
1da177e4 | 196 | } |
1da177e4 LT |
197 | EXPORT_SYMBOL(ide_end_drive_cmd); |
198 | ||
1da177e4 LT |
199 | static void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
200 | { | |
201 | if (rq->rq_disk) { | |
7f3c868b | 202 | struct ide_driver *drv; |
1da177e4 | 203 | |
7f3c868b | 204 | drv = *(struct ide_driver **)rq->rq_disk->private_data; |
1da177e4 LT |
205 | drv->end_request(drive, 0, 0); |
206 | } else | |
207 | ide_end_request(drive, 0, 0); | |
208 | } | |
209 | ||
210 | static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
211 | { | |
212 | ide_hwif_t *hwif = drive->hwif; | |
213 | ||
97100fc8 BZ |
214 | if ((stat & ATA_BUSY) || |
215 | ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { | |
1da177e4 LT |
216 | /* other bits are useless when BUSY */ |
217 | rq->errors |= ERROR_RESET; | |
3a7d2484 | 218 | } else if (stat & ATA_ERR) { |
1da177e4 | 219 | /* err has different meaning on cdrom and tape */ |
3a7d2484 | 220 | if (err == ATA_ABORTED) { |
d1d76714 | 221 | if ((drive->dev_flags & IDE_DFLAG_LBA) && |
aaaade3f BZ |
222 | /* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */ |
223 | hwif->tp_ops->read_status(hwif) == ATA_CMD_INIT_DEV_PARAMS) | |
1da177e4 LT |
224 | return ide_stopped; |
225 | } else if ((err & BAD_CRC) == BAD_CRC) { | |
226 | /* UDMA crc error, just retry the operation */ | |
227 | drive->crc_count++; | |
3a7d2484 | 228 | } else if (err & (ATA_BBK | ATA_UNC)) { |
1da177e4 LT |
229 | /* retries won't help these */ |
230 | rq->errors = ERROR_MAX; | |
3a7d2484 | 231 | } else if (err & ATA_TRK0NF) { |
1da177e4 LT |
232 | /* help it find track zero */ |
233 | rq->errors |= ERROR_RECAL; | |
234 | } | |
235 | } | |
236 | ||
3a7d2484 | 237 | if ((stat & ATA_DRQ) && rq_data_dir(rq) == READ && |
57279a7a BZ |
238 | (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) { |
239 | int nsect = drive->mult_count ? drive->mult_count : 1; | |
240 | ||
241 | ide_pad_transfer(drive, READ, nsect * SECTOR_SIZE); | |
242 | } | |
1da177e4 | 243 | |
513daadd SS |
244 | if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) { |
245 | ide_kill_rq(drive, rq); | |
246 | return ide_stopped; | |
247 | } | |
248 | ||
3a7d2484 | 249 | if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) |
513daadd | 250 | rq->errors |= ERROR_RESET; |
1da177e4 | 251 | |
513daadd | 252 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { |
1da177e4 | 253 | ++rq->errors; |
513daadd | 254 | return ide_do_reset(drive); |
1da177e4 | 255 | } |
513daadd SS |
256 | |
257 | if ((rq->errors & ERROR_RECAL) == ERROR_RECAL) | |
258 | drive->special.b.recalibrate = 1; | |
259 | ||
260 | ++rq->errors; | |
261 | ||
1da177e4 LT |
262 | return ide_stopped; |
263 | } | |
264 | ||
265 | static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
266 | { | |
267 | ide_hwif_t *hwif = drive->hwif; | |
268 | ||
97100fc8 BZ |
269 | if ((stat & ATA_BUSY) || |
270 | ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { | |
1da177e4 LT |
271 | /* other bits are useless when BUSY */ |
272 | rq->errors |= ERROR_RESET; | |
273 | } else { | |
274 | /* add decoding error stuff */ | |
275 | } | |
276 | ||
3a7d2484 | 277 | if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) |
1da177e4 | 278 | /* force an abort */ |
aaaade3f | 279 | hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE); |
1da177e4 LT |
280 | |
281 | if (rq->errors >= ERROR_MAX) { | |
282 | ide_kill_rq(drive, rq); | |
283 | } else { | |
284 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { | |
285 | ++rq->errors; | |
286 | return ide_do_reset(drive); | |
287 | } | |
288 | ++rq->errors; | |
289 | } | |
290 | ||
291 | return ide_stopped; | |
292 | } | |
293 | ||
627e05da | 294 | static ide_startstop_t |
1da177e4 LT |
295 | __ide_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) |
296 | { | |
297 | if (drive->media == ide_disk) | |
298 | return ide_ata_error(drive, rq, stat, err); | |
299 | return ide_atapi_error(drive, rq, stat, err); | |
300 | } | |
301 | ||
1da177e4 LT |
302 | /** |
303 | * ide_error - handle an error on the IDE | |
304 | * @drive: drive the error occurred on | |
305 | * @msg: message to report | |
306 | * @stat: status bits | |
307 | * | |
308 | * ide_error() takes action based on the error returned by the drive. | |
309 | * For normal I/O that may well include retries. We deal with | |
310 | * both new-style (taskfile) and old style command handling here. | |
311 | * In the case of taskfile command handling there is work left to | |
312 | * do | |
313 | */ | |
314 | ||
315 | ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat) | |
316 | { | |
317 | struct request *rq; | |
318 | u8 err; | |
319 | ||
320 | err = ide_dump_status(drive, msg, stat); | |
321 | ||
b65fac32 BZ |
322 | rq = drive->hwif->rq; |
323 | if (rq == NULL) | |
1da177e4 LT |
324 | return ide_stopped; |
325 | ||
326 | /* retry only "normal" I/O: */ | |
4aff5e23 | 327 | if (!blk_fs_request(rq)) { |
1da177e4 LT |
328 | rq->errors = 1; |
329 | ide_end_drive_cmd(drive, stat, err); | |
330 | return ide_stopped; | |
331 | } | |
332 | ||
627e05da | 333 | return __ide_error(drive, rq, stat, err); |
1da177e4 | 334 | } |
1da177e4 LT |
335 | EXPORT_SYMBOL_GPL(ide_error); |
336 | ||
57d7366b | 337 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 338 | { |
57d7366b BZ |
339 | tf->nsect = drive->sect; |
340 | tf->lbal = drive->sect; | |
341 | tf->lbam = drive->cyl; | |
342 | tf->lbah = drive->cyl >> 8; | |
7f612f27 | 343 | tf->device = (drive->head - 1) | drive->select; |
aaaade3f | 344 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
1da177e4 LT |
345 | } |
346 | ||
57d7366b | 347 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 348 | { |
57d7366b | 349 | tf->nsect = drive->sect; |
aaaade3f | 350 | tf->command = ATA_CMD_RESTORE; |
1da177e4 LT |
351 | } |
352 | ||
57d7366b | 353 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 354 | { |
57d7366b | 355 | tf->nsect = drive->mult_req; |
aaaade3f | 356 | tf->command = ATA_CMD_SET_MULTI; |
1da177e4 LT |
357 | } |
358 | ||
359 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) | |
360 | { | |
361 | special_t *s = &drive->special; | |
362 | ide_task_t args; | |
363 | ||
364 | memset(&args, 0, sizeof(ide_task_t)); | |
ac026ff2 | 365 | args.data_phase = TASKFILE_NO_DATA; |
1da177e4 LT |
366 | |
367 | if (s->b.set_geometry) { | |
368 | s->b.set_geometry = 0; | |
57d7366b | 369 | ide_tf_set_specify_cmd(drive, &args.tf); |
1da177e4 LT |
370 | } else if (s->b.recalibrate) { |
371 | s->b.recalibrate = 0; | |
57d7366b | 372 | ide_tf_set_restore_cmd(drive, &args.tf); |
1da177e4 LT |
373 | } else if (s->b.set_multmode) { |
374 | s->b.set_multmode = 0; | |
57d7366b | 375 | ide_tf_set_setmult_cmd(drive, &args.tf); |
1da177e4 LT |
376 | } else if (s->all) { |
377 | int special = s->all; | |
378 | s->all = 0; | |
379 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); | |
380 | return ide_stopped; | |
381 | } | |
382 | ||
657cc1a8 | 383 | args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
57d7366b | 384 | IDE_TFLAG_CUSTOM_HANDLER; |
74095a91 | 385 | |
1da177e4 LT |
386 | do_rw_taskfile(drive, &args); |
387 | ||
388 | return ide_started; | |
389 | } | |
390 | ||
391 | /** | |
392 | * do_special - issue some special commands | |
393 | * @drive: drive the command is for | |
394 | * | |
aaaade3f BZ |
395 | * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, |
396 | * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. | |
397 | * | |
398 | * It used to do much more, but has been scaled back. | |
1da177e4 LT |
399 | */ |
400 | ||
401 | static ide_startstop_t do_special (ide_drive_t *drive) | |
402 | { | |
403 | special_t *s = &drive->special; | |
404 | ||
405 | #ifdef DEBUG | |
406 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); | |
407 | #endif | |
6982daf7 BZ |
408 | if (drive->media == ide_disk) |
409 | return ide_disk_special(drive); | |
1da177e4 | 410 | |
6982daf7 BZ |
411 | s->all = 0; |
412 | drive->mult_req = 0; | |
413 | return ide_stopped; | |
1da177e4 LT |
414 | } |
415 | ||
416 | void ide_map_sg(ide_drive_t *drive, struct request *rq) | |
417 | { | |
418 | ide_hwif_t *hwif = drive->hwif; | |
419 | struct scatterlist *sg = hwif->sg_table; | |
420 | ||
9e772d01 | 421 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
1da177e4 LT |
422 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); |
423 | hwif->sg_nents = 1; | |
9e772d01 BP |
424 | } else if (!rq->bio) { |
425 | sg_init_one(sg, rq->data, rq->data_len); | |
426 | hwif->sg_nents = 1; | |
427 | } else { | |
428 | hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); | |
1da177e4 LT |
429 | } |
430 | } | |
431 | ||
432 | EXPORT_SYMBOL_GPL(ide_map_sg); | |
433 | ||
434 | void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq) | |
435 | { | |
436 | ide_hwif_t *hwif = drive->hwif; | |
437 | ||
438 | hwif->nsect = hwif->nleft = rq->nr_sectors; | |
55c16a70 JA |
439 | hwif->cursg_ofs = 0; |
440 | hwif->cursg = NULL; | |
1da177e4 LT |
441 | } |
442 | ||
443 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); | |
444 | ||
445 | /** | |
446 | * execute_drive_command - issue special drive command | |
338cec32 | 447 | * @drive: the drive to issue the command on |
1da177e4 LT |
448 | * @rq: the request structure holding the command |
449 | * | |
450 | * execute_drive_cmd() issues a special drive command, usually | |
451 | * initiated by ioctl() from the external hdparm program. The | |
452 | * command can be a drive command, drive task or taskfile | |
453 | * operation. Weirdly you can call it with NULL to wait for | |
454 | * all commands to finish. Don't do this as that is due to change | |
455 | */ | |
456 | ||
457 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, | |
458 | struct request *rq) | |
459 | { | |
898ec223 | 460 | ide_hwif_t *hwif = drive->hwif; |
7267c337 | 461 | ide_task_t *task = rq->special; |
1da177e4 | 462 | |
7267c337 | 463 | if (task) { |
21d535c9 | 464 | hwif->data_phase = task->data_phase; |
1da177e4 LT |
465 | |
466 | switch (hwif->data_phase) { | |
467 | case TASKFILE_MULTI_OUT: | |
468 | case TASKFILE_OUT: | |
469 | case TASKFILE_MULTI_IN: | |
470 | case TASKFILE_IN: | |
471 | ide_init_sg_cmd(drive, rq); | |
472 | ide_map_sg(drive, rq); | |
473 | default: | |
474 | break; | |
475 | } | |
74095a91 | 476 | |
21d535c9 BZ |
477 | return do_rw_taskfile(drive, task); |
478 | } | |
479 | ||
1da177e4 LT |
480 | /* |
481 | * NULL is actually a valid way of waiting for | |
482 | * all current requests to be flushed from the queue. | |
483 | */ | |
484 | #ifdef DEBUG | |
485 | printk("%s: DRIVE_CMD (null)\n", drive->name); | |
486 | #endif | |
374e042c | 487 | ide_end_drive_cmd(drive, hwif->tp_ops->read_status(hwif), |
b73c7ee2 | 488 | ide_read_error(drive)); |
64a57fe4 | 489 | |
1da177e4 | 490 | return ide_stopped; |
1bc6daae BZ |
491 | } |
492 | ||
79e36a9f EO |
493 | static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
494 | { | |
4abdc6ee EO |
495 | u8 cmd = rq->cmd[0]; |
496 | ||
4abdc6ee | 497 | switch (cmd) { |
1bc6daae BZ |
498 | case REQ_PARK_HEADS: |
499 | case REQ_UNPARK_HEADS: | |
500 | return ide_do_park_unpark(drive, rq); | |
92f1f8fd | 501 | case REQ_DEVSET_EXEC: |
1bc6daae | 502 | return ide_do_devset(drive, rq); |
79e36a9f EO |
503 | case REQ_DRIVE_RESET: |
504 | return ide_do_reset(drive); | |
505 | default: | |
506 | blk_dump_rq_flags(rq, "ide_special_rq - bad request"); | |
507 | ide_end_request(drive, 0, 0); | |
508 | return ide_stopped; | |
509 | } | |
510 | } | |
511 | ||
1da177e4 LT |
512 | /** |
513 | * start_request - start of I/O and command issuing for IDE | |
514 | * | |
515 | * start_request() initiates handling of a new I/O request. It | |
3c619ffd | 516 | * accepts commands and I/O (read/write) requests. |
1da177e4 LT |
517 | * |
518 | * FIXME: this function needs a rename | |
519 | */ | |
520 | ||
521 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) | |
522 | { | |
523 | ide_startstop_t startstop; | |
1da177e4 | 524 | |
4aff5e23 | 525 | BUG_ON(!blk_rq_started(rq)); |
1da177e4 LT |
526 | |
527 | #ifdef DEBUG | |
528 | printk("%s: start_request: current=0x%08lx\n", | |
898ec223 | 529 | drive->hwif->name, (unsigned long) rq); |
1da177e4 LT |
530 | #endif |
531 | ||
532 | /* bail early if we've exceeded max_failures */ | |
533 | if (drive->max_failures && (drive->failures > drive->max_failures)) { | |
b5e1a4e2 | 534 | rq->cmd_flags |= REQ_FAILED; |
1da177e4 LT |
535 | goto kill_rq; |
536 | } | |
537 | ||
ad3cadda JA |
538 | if (blk_pm_request(rq)) |
539 | ide_check_pm_state(drive, rq); | |
1da177e4 LT |
540 | |
541 | SELECT_DRIVE(drive); | |
3a7d2484 BZ |
542 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
543 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { | |
1da177e4 LT |
544 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
545 | return startstop; | |
546 | } | |
547 | if (!drive->special.all) { | |
7f3c868b | 548 | struct ide_driver *drv; |
1da177e4 | 549 | |
513daadd SS |
550 | /* |
551 | * We reset the drive so we need to issue a SETFEATURES. | |
552 | * Do it _after_ do_special() restored device parameters. | |
553 | */ | |
554 | if (drive->current_speed == 0xff) | |
555 | ide_config_drive_speed(drive, drive->desired_speed); | |
556 | ||
7267c337 | 557 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
1da177e4 LT |
558 | return execute_drive_cmd(drive, rq); |
559 | else if (blk_pm_request(rq)) { | |
c00895ab | 560 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
561 | #ifdef DEBUG_PM |
562 | printk("%s: start_power_step(step: %d)\n", | |
6b7d8fc3 | 563 | drive->name, pm->pm_step); |
1da177e4 LT |
564 | #endif |
565 | startstop = ide_start_power_step(drive, rq); | |
566 | if (startstop == ide_stopped && | |
0d346ba0 | 567 | pm->pm_step == IDE_PM_COMPLETED) |
1da177e4 LT |
568 | ide_complete_pm_request(drive, rq); |
569 | return startstop; | |
79e36a9f EO |
570 | } else if (!rq->rq_disk && blk_special_request(rq)) |
571 | /* | |
572 | * TODO: Once all ULDs have been modified to | |
573 | * check for specific op codes rather than | |
574 | * blindly accepting any special request, the | |
575 | * check for ->rq_disk above may be replaced | |
576 | * by a more suitable mechanism or even | |
577 | * dropped entirely. | |
578 | */ | |
579 | return ide_special_rq(drive, rq); | |
1da177e4 | 580 | |
7f3c868b | 581 | drv = *(struct ide_driver **)rq->rq_disk->private_data; |
3c619ffd BZ |
582 | |
583 | return drv->do_request(drive, rq, rq->sector); | |
1da177e4 LT |
584 | } |
585 | return do_special(drive); | |
586 | kill_rq: | |
587 | ide_kill_rq(drive, rq); | |
588 | return ide_stopped; | |
589 | } | |
590 | ||
591 | /** | |
592 | * ide_stall_queue - pause an IDE device | |
593 | * @drive: drive to stall | |
594 | * @timeout: time to stall for (jiffies) | |
595 | * | |
596 | * ide_stall_queue() can be used by a drive to give excess bandwidth back | |
b65fac32 | 597 | * to the port by sleeping for timeout jiffies. |
1da177e4 LT |
598 | */ |
599 | ||
600 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) | |
601 | { | |
602 | if (timeout > WAIT_WORSTCASE) | |
603 | timeout = WAIT_WORSTCASE; | |
604 | drive->sleep = timeout + jiffies; | |
97100fc8 | 605 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
1da177e4 | 606 | } |
1da177e4 LT |
607 | EXPORT_SYMBOL(ide_stall_queue); |
608 | ||
5b31f855 BZ |
609 | static inline int ide_lock_port(ide_hwif_t *hwif) |
610 | { | |
611 | if (hwif->busy) | |
612 | return 1; | |
613 | ||
614 | hwif->busy = 1; | |
615 | ||
616 | return 0; | |
617 | } | |
618 | ||
619 | static inline void ide_unlock_port(ide_hwif_t *hwif) | |
620 | { | |
621 | hwif->busy = 0; | |
622 | } | |
623 | ||
624 | static inline int ide_lock_host(struct ide_host *host, ide_hwif_t *hwif) | |
625 | { | |
626 | int rc = 0; | |
627 | ||
628 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { | |
629 | rc = test_and_set_bit_lock(IDE_HOST_BUSY, &host->host_busy); | |
630 | if (rc == 0) { | |
631 | /* for atari only */ | |
632 | ide_get_lock(ide_intr, hwif); | |
633 | } | |
634 | } | |
635 | return rc; | |
636 | } | |
637 | ||
638 | static inline void ide_unlock_host(struct ide_host *host) | |
639 | { | |
640 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { | |
641 | /* for atari only */ | |
642 | ide_release_lock(); | |
643 | clear_bit_unlock(IDE_HOST_BUSY, &host->host_busy); | |
644 | } | |
645 | } | |
646 | ||
1da177e4 | 647 | /* |
b65fac32 | 648 | * Issue a new request to a device. |
1da177e4 | 649 | */ |
295f0004 | 650 | void do_ide_request(struct request_queue *q) |
1da177e4 | 651 | { |
201bffa4 BZ |
652 | ide_drive_t *drive = q->queuedata; |
653 | ide_hwif_t *hwif = drive->hwif; | |
5b31f855 | 654 | struct ide_host *host = hwif->host; |
5b31f855 | 655 | struct request *rq = NULL; |
1da177e4 LT |
656 | ide_startstop_t startstop; |
657 | ||
201bffa4 BZ |
658 | /* |
659 | * drive is doing pre-flush, ordered write, post-flush sequence. even | |
660 | * though that is 3 requests, it must be seen as a single transaction. | |
661 | * we must not preempt this drive until that is complete | |
662 | */ | |
663 | if (blk_queue_flushing(q)) | |
1da177e4 | 664 | /* |
201bffa4 BZ |
665 | * small race where queue could get replugged during |
666 | * the 3-request flush cycle, just yank the plug since | |
667 | * we want it to finish asap | |
1da177e4 | 668 | */ |
201bffa4 | 669 | blk_remove_plug(q); |
1da177e4 | 670 | |
201bffa4 | 671 | spin_unlock_irq(q->queue_lock); |
5b31f855 BZ |
672 | |
673 | if (ide_lock_host(host, hwif)) | |
674 | goto plug_device_2; | |
675 | ||
b65fac32 | 676 | spin_lock_irq(&hwif->lock); |
295f0004 | 677 | |
5b31f855 | 678 | if (!ide_lock_port(hwif)) { |
42cf2611 | 679 | ide_hwif_t *prev_port; |
201bffa4 | 680 | repeat: |
bd53cbcc | 681 | prev_port = hwif->host->cur_port; |
b65fac32 | 682 | hwif->rq = NULL; |
2fb21150 | 683 | |
201bffa4 BZ |
684 | if (drive->dev_flags & IDE_DFLAG_SLEEPING) { |
685 | if (time_before(drive->sleep, jiffies)) { | |
5b31f855 | 686 | ide_unlock_port(hwif); |
201bffa4 BZ |
687 | goto plug_device; |
688 | } | |
689 | } | |
295f0004 | 690 | |
bd53cbcc BZ |
691 | if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) && |
692 | hwif != prev_port) { | |
7299a391 | 693 | /* |
42cf2611 | 694 | * set nIEN for previous port, drives in the |
7299a391 BZ |
695 | * quirk_list may not like intr setups/cleanups |
696 | */ | |
b65fac32 | 697 | if (prev_port && prev_port->cur_dev->quirk_list == 0) |
42cf2611 | 698 | prev_port->tp_ops->set_irq(prev_port, 0); |
bd53cbcc BZ |
699 | |
700 | hwif->host->cur_port = hwif; | |
1da177e4 | 701 | } |
b65fac32 | 702 | hwif->cur_dev = drive; |
4abdc6ee | 703 | drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED); |
1da177e4 | 704 | |
b65fac32 | 705 | spin_unlock_irq(&hwif->lock); |
201bffa4 | 706 | spin_lock_irq(q->queue_lock); |
1da177e4 LT |
707 | /* |
708 | * we know that the queue isn't empty, but this can happen | |
709 | * if the q->prep_rq_fn() decides to kill a request | |
710 | */ | |
711 | rq = elv_next_request(drive->queue); | |
201bffa4 | 712 | spin_unlock_irq(q->queue_lock); |
b65fac32 | 713 | spin_lock_irq(&hwif->lock); |
201bffa4 | 714 | |
1da177e4 | 715 | if (!rq) { |
5b31f855 | 716 | ide_unlock_port(hwif); |
201bffa4 | 717 | goto out; |
1da177e4 LT |
718 | } |
719 | ||
720 | /* | |
721 | * Sanity: don't accept a request that isn't a PM request | |
722 | * if we are currently power managed. This is very important as | |
723 | * blk_stop_queue() doesn't prevent the elv_next_request() | |
724 | * above to return us whatever is in the queue. Since we call | |
725 | * ide_do_request() ourselves, we end up taking requests while | |
726 | * the queue is blocked... | |
727 | * | |
728 | * We let requests forced at head of queue with ide-preempt | |
729 | * though. I hope that doesn't happen too much, hopefully not | |
730 | * unless the subdriver triggers such a thing in its own PM | |
731 | * state machine. | |
732 | */ | |
97100fc8 BZ |
733 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
734 | blk_pm_request(rq) == 0 && | |
735 | (rq->cmd_flags & REQ_PREEMPT) == 0) { | |
631de370 | 736 | /* there should be no pending command at this point */ |
5b31f855 | 737 | ide_unlock_port(hwif); |
295f0004 | 738 | goto plug_device; |
1da177e4 LT |
739 | } |
740 | ||
b65fac32 | 741 | hwif->rq = rq; |
1da177e4 | 742 | |
b65fac32 | 743 | spin_unlock_irq(&hwif->lock); |
1da177e4 | 744 | startstop = start_request(drive, rq); |
b65fac32 | 745 | spin_lock_irq(&hwif->lock); |
295f0004 | 746 | |
201bffa4 BZ |
747 | if (startstop == ide_stopped) |
748 | goto repeat; | |
749 | } else | |
750 | goto plug_device; | |
751 | out: | |
b65fac32 | 752 | spin_unlock_irq(&hwif->lock); |
5b31f855 BZ |
753 | if (rq == NULL) |
754 | ide_unlock_host(host); | |
201bffa4 | 755 | spin_lock_irq(q->queue_lock); |
295f0004 | 756 | return; |
1da177e4 | 757 | |
295f0004 | 758 | plug_device: |
b65fac32 | 759 | spin_unlock_irq(&hwif->lock); |
5b31f855 BZ |
760 | ide_unlock_host(host); |
761 | plug_device_2: | |
201bffa4 BZ |
762 | spin_lock_irq(q->queue_lock); |
763 | ||
764 | if (!elv_queue_empty(q)) | |
765 | blk_plug_device(q); | |
1da177e4 LT |
766 | } |
767 | ||
201bffa4 BZ |
768 | static void ide_plug_device(ide_drive_t *drive) |
769 | { | |
770 | struct request_queue *q = drive->queue; | |
771 | unsigned long flags; | |
772 | ||
773 | spin_lock_irqsave(q->queue_lock, flags); | |
774 | if (!elv_queue_empty(q)) | |
775 | blk_plug_device(q); | |
776 | spin_unlock_irqrestore(q->queue_lock, flags); | |
777 | } | |
778 | ||
b6a45a0b BZ |
779 | static int drive_is_ready(ide_drive_t *drive) |
780 | { | |
781 | ide_hwif_t *hwif = drive->hwif; | |
782 | u8 stat = 0; | |
783 | ||
784 | if (drive->waiting_for_dma) | |
785 | return hwif->dma_ops->dma_test_irq(drive); | |
786 | ||
787 | if (hwif->io_ports.ctl_addr && | |
788 | (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) | |
789 | stat = hwif->tp_ops->read_altstatus(hwif); | |
790 | else | |
791 | /* Note: this may clear a pending IRQ!! */ | |
792 | stat = hwif->tp_ops->read_status(hwif); | |
793 | ||
794 | if (stat & ATA_BUSY) | |
795 | /* drive busy: definitely not interrupting */ | |
796 | return 0; | |
797 | ||
798 | /* drive ready: *might* be interrupting */ | |
799 | return 1; | |
800 | } | |
801 | ||
1da177e4 LT |
802 | /** |
803 | * ide_timer_expiry - handle lack of an IDE interrupt | |
b65fac32 | 804 | * @data: timer callback magic (hwif) |
1da177e4 LT |
805 | * |
806 | * An IDE command has timed out before the expected drive return | |
807 | * occurred. At this point we attempt to clean up the current | |
808 | * mess. If the current handler includes an expiry handler then | |
809 | * we invoke the expiry handler, and providing it is happy the | |
810 | * work is done. If that fails we apply generic recovery rules | |
811 | * invoking the handler and checking the drive DMA status. We | |
812 | * have an excessively incestuous relationship with the DMA | |
813 | * logic that wants cleaning up. | |
814 | */ | |
815 | ||
816 | void ide_timer_expiry (unsigned long data) | |
817 | { | |
b65fac32 | 818 | ide_hwif_t *hwif = (ide_hwif_t *)data; |
201bffa4 | 819 | ide_drive_t *uninitialized_var(drive); |
1da177e4 | 820 | ide_handler_t *handler; |
1da177e4 | 821 | unsigned long flags; |
e0c6dcd8 | 822 | int wait = -1; |
201bffa4 | 823 | int plug_device = 0; |
1da177e4 | 824 | |
b65fac32 BZ |
825 | spin_lock_irqsave(&hwif->lock, flags); |
826 | ||
827 | handler = hwif->handler; | |
1da177e4 | 828 | |
b65fac32 | 829 | if (handler == NULL || hwif->req_gen != hwif->req_gen_timer) { |
1da177e4 LT |
830 | /* |
831 | * Either a marginal timeout occurred | |
832 | * (got the interrupt just as timer expired), | |
833 | * or we were "sleeping" to give other devices a chance. | |
834 | * Either way, we don't really want to complain about anything. | |
835 | */ | |
1da177e4 | 836 | } else { |
c38714ed BZ |
837 | ide_expiry_t *expiry = hwif->expiry; |
838 | ide_startstop_t startstop = ide_stopped; | |
839 | ||
b65fac32 | 840 | drive = hwif->cur_dev; |
c38714ed BZ |
841 | |
842 | if (expiry) { | |
843 | wait = expiry(drive); | |
844 | if (wait > 0) { /* continue */ | |
845 | /* reset timer */ | |
846 | hwif->timer.expires = jiffies + wait; | |
847 | hwif->req_gen_timer = hwif->req_gen; | |
848 | add_timer(&hwif->timer); | |
849 | spin_unlock_irqrestore(&hwif->lock, flags); | |
850 | return; | |
295f0004 | 851 | } |
1da177e4 | 852 | } |
c38714ed BZ |
853 | hwif->handler = NULL; |
854 | /* | |
855 | * We need to simulate a real interrupt when invoking | |
856 | * the handler() function, which means we need to | |
857 | * globally mask the specific IRQ: | |
858 | */ | |
859 | spin_unlock(&hwif->lock); | |
860 | /* disable_irq_nosync ?? */ | |
861 | disable_irq(hwif->irq); | |
862 | /* local CPU only, as if we were handling an interrupt */ | |
863 | local_irq_disable(); | |
864 | if (hwif->polling) { | |
865 | startstop = handler(drive); | |
866 | } else if (drive_is_ready(drive)) { | |
867 | if (drive->waiting_for_dma) | |
868 | hwif->dma_ops->dma_lost_irq(drive); | |
869 | (void)ide_ack_intr(hwif); | |
870 | printk(KERN_WARNING "%s: lost interrupt\n", | |
871 | drive->name); | |
872 | startstop = handler(drive); | |
873 | } else { | |
874 | if (drive->waiting_for_dma) | |
875 | startstop = ide_dma_timeout_retry(drive, wait); | |
876 | else | |
877 | startstop = ide_error(drive, "irq timeout", | |
878 | hwif->tp_ops->read_status(hwif)); | |
879 | } | |
880 | spin_lock_irq(&hwif->lock); | |
881 | enable_irq(hwif->irq); | |
882 | if (startstop == ide_stopped) { | |
883 | ide_unlock_port(hwif); | |
884 | plug_device = 1; | |
885 | } | |
1da177e4 | 886 | } |
b65fac32 | 887 | spin_unlock_irqrestore(&hwif->lock, flags); |
201bffa4 | 888 | |
5b31f855 BZ |
889 | if (plug_device) { |
890 | ide_unlock_host(hwif->host); | |
201bffa4 | 891 | ide_plug_device(drive); |
5b31f855 | 892 | } |
1da177e4 LT |
893 | } |
894 | ||
895 | /** | |
896 | * unexpected_intr - handle an unexpected IDE interrupt | |
897 | * @irq: interrupt line | |
bd53cbcc | 898 | * @hwif: port being processed |
1da177e4 LT |
899 | * |
900 | * There's nothing really useful we can do with an unexpected interrupt, | |
901 | * other than reading the status register (to clear it), and logging it. | |
902 | * There should be no way that an irq can happen before we're ready for it, | |
903 | * so we needn't worry much about losing an "important" interrupt here. | |
904 | * | |
905 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever | |
906 | * the drive enters "idle", "standby", or "sleep" mode, so if the status | |
907 | * looks "good", we just ignore the interrupt completely. | |
908 | * | |
909 | * This routine assumes __cli() is in effect when called. | |
910 | * | |
911 | * If an unexpected interrupt happens on irq15 while we are handling irq14 | |
912 | * and if the two interfaces are "serialized" (CMD640), then it looks like | |
913 | * we could screw up by interfering with a new request being set up for | |
914 | * irq15. | |
915 | * | |
916 | * In reality, this is a non-issue. The new command is not sent unless | |
917 | * the drive is ready to accept one, in which case we know the drive is | |
918 | * not trying to interrupt us. And ide_set_handler() is always invoked | |
919 | * before completing the issuance of any new drive command, so we will not | |
920 | * be accidentally invoked as a result of any valid command completion | |
921 | * interrupt. | |
1da177e4 | 922 | */ |
bd53cbcc BZ |
923 | |
924 | static void unexpected_intr(int irq, ide_hwif_t *hwif) | |
1da177e4 | 925 | { |
ae86afae BZ |
926 | u8 stat = hwif->tp_ops->read_status(hwif); |
927 | ||
928 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { | |
929 | /* Try to not flood the console with msgs */ | |
930 | static unsigned long last_msgtime, count; | |
931 | ++count; | |
932 | ||
933 | if (time_after(jiffies, last_msgtime + HZ)) { | |
934 | last_msgtime = jiffies; | |
935 | printk(KERN_ERR "%s: unexpected interrupt, " | |
936 | "status=0x%02x, count=%ld\n", | |
937 | hwif->name, stat, count); | |
1da177e4 | 938 | } |
ae86afae | 939 | } |
1da177e4 LT |
940 | } |
941 | ||
942 | /** | |
943 | * ide_intr - default IDE interrupt handler | |
944 | * @irq: interrupt number | |
ae86afae | 945 | * @dev_id: hwif |
1da177e4 LT |
946 | * @regs: unused weirdness from the kernel irq layer |
947 | * | |
948 | * This is the default IRQ handler for the IDE layer. You should | |
949 | * not need to override it. If you do be aware it is subtle in | |
950 | * places | |
951 | * | |
bd53cbcc | 952 | * hwif is the interface in the group currently performing |
b65fac32 | 953 | * a command. hwif->cur_dev is the drive and hwif->handler is |
1da177e4 LT |
954 | * the IRQ handler to call. As we issue a command the handlers |
955 | * step through multiple states, reassigning the handler to the | |
956 | * next step in the process. Unlike a smart SCSI controller IDE | |
957 | * expects the main processor to sequence the various transfer | |
958 | * stages. We also manage a poll timer to catch up with most | |
959 | * timeout situations. There are still a few where the handlers | |
960 | * don't ever decide to give up. | |
961 | * | |
962 | * The handler eventually returns ide_stopped to indicate the | |
963 | * request completed. At this point we issue the next request | |
b65fac32 | 964 | * on the port and the process begins again. |
1da177e4 | 965 | */ |
b65fac32 | 966 | |
7d12e780 | 967 | irqreturn_t ide_intr (int irq, void *dev_id) |
1da177e4 | 968 | { |
ae86afae | 969 | ide_hwif_t *hwif = (ide_hwif_t *)dev_id; |
201bffa4 | 970 | ide_drive_t *uninitialized_var(drive); |
1da177e4 | 971 | ide_handler_t *handler; |
ae86afae | 972 | unsigned long flags; |
1da177e4 | 973 | ide_startstop_t startstop; |
3e0e29f7 | 974 | irqreturn_t irq_ret = IRQ_NONE; |
201bffa4 | 975 | int plug_device = 0; |
1da177e4 | 976 | |
ae86afae BZ |
977 | if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE) { |
978 | if (hwif != hwif->host->cur_port) | |
979 | goto out_early; | |
980 | } | |
bd53cbcc | 981 | |
b65fac32 | 982 | spin_lock_irqsave(&hwif->lock, flags); |
1da177e4 | 983 | |
3e0e29f7 BZ |
984 | if (!ide_ack_intr(hwif)) |
985 | goto out; | |
1da177e4 | 986 | |
b65fac32 BZ |
987 | handler = hwif->handler; |
988 | ||
989 | if (handler == NULL || hwif->polling) { | |
1da177e4 LT |
990 | /* |
991 | * Not expecting an interrupt from this drive. | |
992 | * That means this could be: | |
993 | * (1) an interrupt from another PCI device | |
994 | * sharing the same PCI INT# as us. | |
995 | * or (2) a drive just entered sleep or standby mode, | |
996 | * and is interrupting to let us know. | |
997 | * or (3) a spurious interrupt of unknown origin. | |
998 | * | |
999 | * For PCI, we cannot tell the difference, | |
1000 | * so in that case we just ignore it and hope it goes away. | |
1001 | * | |
1002 | * FIXME: unexpected_intr should be hwif-> then we can | |
1003 | * remove all the ifdef PCI crap | |
1004 | */ | |
1005 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
425afb61 | 1006 | if (hwif->chipset != ide_pci) |
1da177e4 LT |
1007 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
1008 | { | |
1009 | /* | |
1010 | * Probably not a shared PCI interrupt, | |
1011 | * so we can safely try to do something about it: | |
1012 | */ | |
bd53cbcc | 1013 | unexpected_intr(irq, hwif); |
1da177e4 LT |
1014 | #ifdef CONFIG_BLK_DEV_IDEPCI |
1015 | } else { | |
1016 | /* | |
1017 | * Whack the status register, just in case | |
1018 | * we have a leftover pending IRQ. | |
1019 | */ | |
374e042c | 1020 | (void)hwif->tp_ops->read_status(hwif); |
1da177e4 LT |
1021 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
1022 | } | |
3e0e29f7 | 1023 | goto out; |
1da177e4 | 1024 | } |
3e0e29f7 | 1025 | |
b65fac32 | 1026 | drive = hwif->cur_dev; |
3e0e29f7 BZ |
1027 | |
1028 | if (!drive_is_ready(drive)) | |
1da177e4 LT |
1029 | /* |
1030 | * This happens regularly when we share a PCI IRQ with | |
1031 | * another device. Unfortunately, it can also happen | |
1032 | * with some buggy drives that trigger the IRQ before | |
1033 | * their status register is up to date. Hopefully we have | |
1034 | * enough advance overhead that the latter isn't a problem. | |
1035 | */ | |
3e0e29f7 BZ |
1036 | goto out; |
1037 | ||
b65fac32 BZ |
1038 | hwif->handler = NULL; |
1039 | hwif->req_gen++; | |
1040 | del_timer(&hwif->timer); | |
1041 | spin_unlock(&hwif->lock); | |
1da177e4 | 1042 | |
bfa7d8e5 BZ |
1043 | if (hwif->port_ops && hwif->port_ops->clear_irq) |
1044 | hwif->port_ops->clear_irq(drive); | |
f0dd8712 | 1045 | |
97100fc8 | 1046 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
366c7f55 | 1047 | local_irq_enable_in_hardirq(); |
bfa7d8e5 | 1048 | |
1da177e4 LT |
1049 | /* service this interrupt, may set handler for next interrupt */ |
1050 | startstop = handler(drive); | |
1da177e4 | 1051 | |
b65fac32 | 1052 | spin_lock_irq(&hwif->lock); |
1da177e4 LT |
1053 | /* |
1054 | * Note that handler() may have set things up for another | |
1055 | * interrupt to occur soon, but it cannot happen until | |
1056 | * we exit from this routine, because it will be the | |
1057 | * same irq as is currently being serviced here, and Linux | |
1058 | * won't allow another of the same (on any CPU) until we return. | |
1059 | */ | |
1da177e4 | 1060 | if (startstop == ide_stopped) { |
9600dcf1 BZ |
1061 | BUG_ON(hwif->handler); |
1062 | ide_unlock_port(hwif); | |
1063 | plug_device = 1; | |
1da177e4 | 1064 | } |
3e0e29f7 BZ |
1065 | irq_ret = IRQ_HANDLED; |
1066 | out: | |
b65fac32 | 1067 | spin_unlock_irqrestore(&hwif->lock, flags); |
ae86afae | 1068 | out_early: |
5b31f855 BZ |
1069 | if (plug_device) { |
1070 | ide_unlock_host(hwif->host); | |
201bffa4 | 1071 | ide_plug_device(drive); |
5b31f855 | 1072 | } |
201bffa4 | 1073 | |
3e0e29f7 | 1074 | return irq_ret; |
1da177e4 | 1075 | } |
849d7130 | 1076 | EXPORT_SYMBOL_GPL(ide_intr); |
1da177e4 | 1077 | |
9f87abe8 BZ |
1078 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) |
1079 | { | |
1080 | ide_hwif_t *hwif = drive->hwif; | |
1081 | u8 buf[4] = { 0 }; | |
1082 | ||
1083 | while (len > 0) { | |
1084 | if (write) | |
374e042c | 1085 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
9f87abe8 | 1086 | else |
374e042c | 1087 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
9f87abe8 BZ |
1088 | len -= 4; |
1089 | } | |
1090 | } | |
1091 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |