]>
Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
204f47c5 BZ |
2 | * IDE DMA support (including IDE PCI BM-DMA). |
3 | * | |
59bca8cc BZ |
4 | * Copyright (C) 1995-1998 Mark Lord |
5 | * Copyright (C) 1999-2000 Andre Hedrick <andre@linux-ide.org> | |
6 | * Copyright (C) 2004, 2007 Bartlomiej Zolnierkiewicz | |
58f189fc | 7 | * |
1da177e4 | 8 | * May be copied or modified under the terms of the GNU General Public License |
204f47c5 BZ |
9 | * |
10 | * DMA is supported for all IDE devices (disk drives, cdroms, tapes, floppies). | |
1da177e4 LT |
11 | */ |
12 | ||
13 | /* | |
14 | * Special Thanks to Mark for his Six years of work. | |
1da177e4 LT |
15 | */ |
16 | ||
17 | /* | |
1da177e4 LT |
18 | * Thanks to "Christopher J. Reimer" <reimer@doe.carleton.ca> for |
19 | * fixing the problem with the BIOS on some Acer motherboards. | |
20 | * | |
21 | * Thanks to "Benoit Poulot-Cazajous" <poulot@chorus.fr> for testing | |
22 | * "TX" chipset compatibility and for providing patches for the "TX" chipset. | |
23 | * | |
24 | * Thanks to Christian Brunner <chb@muc.de> for taking a good first crack | |
25 | * at generic DMA -- his patches were referred to when preparing this code. | |
26 | * | |
27 | * Most importantly, thanks to Robert Bringman <rob@mars.trion.com> | |
28 | * for supplying a Promise UDMA board & WD UDMA drive for this work! | |
1da177e4 LT |
29 | */ |
30 | ||
1da177e4 LT |
31 | #include <linux/types.h> |
32 | #include <linux/kernel.h> | |
1da177e4 | 33 | #include <linux/ide.h> |
1da177e4 | 34 | #include <linux/scatterlist.h> |
5c05ff68 | 35 | #include <linux/dma-mapping.h> |
1da177e4 | 36 | |
db3f99ef | 37 | static const struct drive_list_entry drive_whitelist[] = { |
c2d3ce8c JH |
38 | { "Micropolis 2112A" , NULL }, |
39 | { "CONNER CTMA 4000" , NULL }, | |
40 | { "CONNER CTT8000-A" , NULL }, | |
41 | { "ST34342A" , NULL }, | |
1da177e4 LT |
42 | { NULL , NULL } |
43 | }; | |
44 | ||
db3f99ef | 45 | static const struct drive_list_entry drive_blacklist[] = { |
c2d3ce8c JH |
46 | { "WDC AC11000H" , NULL }, |
47 | { "WDC AC22100H" , NULL }, | |
48 | { "WDC AC32500H" , NULL }, | |
49 | { "WDC AC33100H" , NULL }, | |
50 | { "WDC AC31600H" , NULL }, | |
1da177e4 LT |
51 | { "WDC AC32100H" , "24.09P07" }, |
52 | { "WDC AC23200L" , "21.10N21" }, | |
c2d3ce8c JH |
53 | { "Compaq CRD-8241B" , NULL }, |
54 | { "CRD-8400B" , NULL }, | |
55 | { "CRD-8480B", NULL }, | |
56 | { "CRD-8482B", NULL }, | |
57 | { "CRD-84" , NULL }, | |
58 | { "SanDisk SDP3B" , NULL }, | |
59 | { "SanDisk SDP3B-64" , NULL }, | |
60 | { "SANYO CD-ROM CRD" , NULL }, | |
61 | { "HITACHI CDR-8" , NULL }, | |
62 | { "HITACHI CDR-8335" , NULL }, | |
63 | { "HITACHI CDR-8435" , NULL }, | |
64 | { "Toshiba CD-ROM XM-6202B" , NULL }, | |
65 | { "TOSHIBA CD-ROM XM-1702BC", NULL }, | |
66 | { "CD-532E-A" , NULL }, | |
67 | { "E-IDE CD-ROM CR-840", NULL }, | |
68 | { "CD-ROM Drive/F5A", NULL }, | |
69 | { "WPI CDD-820", NULL }, | |
70 | { "SAMSUNG CD-ROM SC-148C", NULL }, | |
71 | { "SAMSUNG CD-ROM SC", NULL }, | |
72 | { "ATAPI CD-ROM DRIVE 40X MAXIMUM", NULL }, | |
73 | { "_NEC DV5800A", NULL }, | |
5a6248ca | 74 | { "SAMSUNG CD-ROM SN-124", "N001" }, |
c2d3ce8c | 75 | { "Seagate STT20000A", NULL }, |
b0bc65b9 | 76 | { "CD-ROM CDR_U200", "1.09" }, |
1da177e4 LT |
77 | { NULL , NULL } |
78 | ||
79 | }; | |
80 | ||
1da177e4 LT |
81 | /** |
82 | * ide_dma_intr - IDE DMA interrupt handler | |
83 | * @drive: the drive the interrupt is for | |
84 | * | |
db3f99ef | 85 | * Handle an interrupt completing a read/write DMA transfer on an |
1da177e4 LT |
86 | * IDE device |
87 | */ | |
db3f99ef BZ |
88 | |
89 | ide_startstop_t ide_dma_intr(ide_drive_t *drive) | |
1da177e4 | 90 | { |
b73c7ee2 | 91 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 LT |
92 | u8 stat = 0, dma_stat = 0; |
93 | ||
b73c7ee2 | 94 | dma_stat = hwif->dma_ops->dma_end(drive); |
374e042c | 95 | stat = hwif->tp_ops->read_status(hwif); |
c47137a9 | 96 | |
3a7d2484 | 97 | if (OK_STAT(stat, DRIVE_READY, drive->bad_wstat | ATA_DRQ)) { |
1da177e4 | 98 | if (!dma_stat) { |
adb1af98 | 99 | struct ide_cmd *cmd = &hwif->cmd; |
1da177e4 | 100 | |
adb1af98 | 101 | ide_finish_cmd(drive, cmd, stat); |
1da177e4 LT |
102 | return ide_stopped; |
103 | } | |
db3f99ef BZ |
104 | printk(KERN_ERR "%s: %s: bad DMA status (0x%02x)\n", |
105 | drive->name, __func__, dma_stat); | |
1da177e4 LT |
106 | } |
107 | return ide_error(drive, "dma_intr", stat); | |
108 | } | |
1da177e4 LT |
109 | EXPORT_SYMBOL_GPL(ide_dma_intr); |
110 | ||
2dbe7e91 | 111 | int ide_dma_good_drive(ide_drive_t *drive) |
75d7d963 BZ |
112 | { |
113 | return ide_in_drive_list(drive->id, drive_whitelist); | |
114 | } | |
115 | ||
1da177e4 LT |
116 | /** |
117 | * ide_build_sglist - map IDE scatter gather for DMA I/O | |
118 | * @drive: the drive to build the DMA table for | |
119 | * @rq: the request holding the sg list | |
120 | * | |
5c05ff68 BZ |
121 | * Perform the DMA mapping magic necessary to access the source or |
122 | * target buffers of a request via DMA. The lower layers of the | |
1da177e4 | 123 | * kernel provide the necessary cache management so that we can |
5c05ff68 | 124 | * operate in a portable fashion. |
1da177e4 LT |
125 | */ |
126 | ||
127 | int ide_build_sglist(ide_drive_t *drive, struct request *rq) | |
128 | { | |
db3f99ef | 129 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 130 | struct scatterlist *sg = hwif->sg_table; |
5d82720a | 131 | int i; |
1da177e4 | 132 | |
1da177e4 LT |
133 | ide_map_sg(drive, rq); |
134 | ||
135 | if (rq_data_dir(rq) == READ) | |
5c05ff68 | 136 | hwif->sg_dma_direction = DMA_FROM_DEVICE; |
1da177e4 | 137 | else |
5c05ff68 | 138 | hwif->sg_dma_direction = DMA_TO_DEVICE; |
1da177e4 | 139 | |
5d82720a | 140 | i = dma_map_sg(hwif->dev, sg, hwif->sg_nents, hwif->sg_dma_direction); |
e6830a86 BZ |
141 | if (i == 0) |
142 | ide_map_sg(drive, rq); | |
143 | else { | |
5d82720a FT |
144 | hwif->orig_sg_nents = hwif->sg_nents; |
145 | hwif->sg_nents = i; | |
146 | } | |
147 | ||
148 | return i; | |
1da177e4 | 149 | } |
1da177e4 | 150 | |
1da177e4 LT |
151 | /** |
152 | * ide_destroy_dmatable - clean up DMA mapping | |
153 | * @drive: The drive to unmap | |
154 | * | |
155 | * Teardown mappings after DMA has completed. This must be called | |
156 | * after the completion of each use of ide_build_dmatable and before | |
157 | * the next use of ide_build_dmatable. Failure to do so will cause | |
158 | * an oops as only one mapping can be live for each target at a given | |
159 | * time. | |
160 | */ | |
db3f99ef BZ |
161 | |
162 | void ide_destroy_dmatable(ide_drive_t *drive) | |
1da177e4 | 163 | { |
36501650 | 164 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 165 | |
5d82720a | 166 | dma_unmap_sg(hwif->dev, hwif->sg_table, hwif->orig_sg_nents, |
36501650 | 167 | hwif->sg_dma_direction); |
1da177e4 | 168 | } |
1da177e4 LT |
169 | EXPORT_SYMBOL_GPL(ide_destroy_dmatable); |
170 | ||
1da177e4 | 171 | /** |
7469aaf6 | 172 | * ide_dma_off_quietly - Generic DMA kill |
1da177e4 LT |
173 | * @drive: drive to control |
174 | * | |
db3f99ef | 175 | * Turn off the current DMA on this IDE controller. |
1da177e4 LT |
176 | */ |
177 | ||
7469aaf6 | 178 | void ide_dma_off_quietly(ide_drive_t *drive) |
1da177e4 | 179 | { |
97100fc8 | 180 | drive->dev_flags &= ~IDE_DFLAG_USING_DMA; |
1da177e4 LT |
181 | ide_toggle_bounce(drive, 0); |
182 | ||
5e37bdc0 | 183 | drive->hwif->dma_ops->dma_host_set(drive, 0); |
1da177e4 | 184 | } |
7469aaf6 | 185 | EXPORT_SYMBOL(ide_dma_off_quietly); |
1da177e4 LT |
186 | |
187 | /** | |
7469aaf6 | 188 | * ide_dma_off - disable DMA on a device |
1da177e4 LT |
189 | * @drive: drive to disable DMA on |
190 | * | |
191 | * Disable IDE DMA for a device on this IDE controller. | |
192 | * Inform the user that DMA has been disabled. | |
193 | */ | |
194 | ||
7469aaf6 | 195 | void ide_dma_off(ide_drive_t *drive) |
1da177e4 LT |
196 | { |
197 | printk(KERN_INFO "%s: DMA disabled\n", drive->name); | |
4a546e04 | 198 | ide_dma_off_quietly(drive); |
1da177e4 | 199 | } |
7469aaf6 | 200 | EXPORT_SYMBOL(ide_dma_off); |
1da177e4 | 201 | |
1da177e4 | 202 | /** |
4a546e04 | 203 | * ide_dma_on - Enable DMA on a device |
1da177e4 LT |
204 | * @drive: drive to enable DMA on |
205 | * | |
206 | * Enable IDE DMA for a device on this IDE controller. | |
207 | */ | |
4a546e04 BZ |
208 | |
209 | void ide_dma_on(ide_drive_t *drive) | |
1da177e4 | 210 | { |
97100fc8 | 211 | drive->dev_flags |= IDE_DFLAG_USING_DMA; |
1da177e4 LT |
212 | ide_toggle_bounce(drive, 1); |
213 | ||
5e37bdc0 | 214 | drive->hwif->dma_ops->dma_host_set(drive, 1); |
1da177e4 LT |
215 | } |
216 | ||
db3f99ef | 217 | int __ide_dma_bad_drive(ide_drive_t *drive) |
1da177e4 | 218 | { |
4dde4492 | 219 | u16 *id = drive->id; |
1da177e4 | 220 | |
65e5f2e3 | 221 | int blacklist = ide_in_drive_list(id, drive_blacklist); |
1da177e4 LT |
222 | if (blacklist) { |
223 | printk(KERN_WARNING "%s: Disabling (U)DMA for %s (blacklisted)\n", | |
4dde4492 | 224 | drive->name, (char *)&id[ATA_ID_PROD]); |
1da177e4 LT |
225 | return blacklist; |
226 | } | |
227 | return 0; | |
228 | } | |
1da177e4 LT |
229 | EXPORT_SYMBOL(__ide_dma_bad_drive); |
230 | ||
2d5eaa6d BZ |
231 | static const u8 xfer_mode_bases[] = { |
232 | XFER_UDMA_0, | |
233 | XFER_MW_DMA_0, | |
234 | XFER_SW_DMA_0, | |
235 | }; | |
236 | ||
7670df73 | 237 | static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base, u8 req_mode) |
2d5eaa6d | 238 | { |
4dde4492 | 239 | u16 *id = drive->id; |
2d5eaa6d | 240 | ide_hwif_t *hwif = drive->hwif; |
ac95beed | 241 | const struct ide_port_ops *port_ops = hwif->port_ops; |
2d5eaa6d BZ |
242 | unsigned int mask = 0; |
243 | ||
db3f99ef | 244 | switch (base) { |
2d5eaa6d | 245 | case XFER_UDMA_0: |
4dde4492 | 246 | if ((id[ATA_ID_FIELD_VALID] & 4) == 0) |
2d5eaa6d BZ |
247 | break; |
248 | ||
ac95beed BZ |
249 | if (port_ops && port_ops->udma_filter) |
250 | mask = port_ops->udma_filter(drive); | |
851dd33b SS |
251 | else |
252 | mask = hwif->ultra_mask; | |
4dde4492 | 253 | mask &= id[ATA_ID_UDMA_MODES]; |
2d5eaa6d | 254 | |
7670df73 BZ |
255 | /* |
256 | * avoid false cable warning from eighty_ninty_three() | |
257 | */ | |
258 | if (req_mode > XFER_UDMA_2) { | |
259 | if ((mask & 0x78) && (eighty_ninty_three(drive) == 0)) | |
260 | mask &= 0x07; | |
261 | } | |
2d5eaa6d BZ |
262 | break; |
263 | case XFER_MW_DMA_0: | |
4dde4492 | 264 | if ((id[ATA_ID_FIELD_VALID] & 2) == 0) |
b4e44369 | 265 | break; |
ac95beed BZ |
266 | if (port_ops && port_ops->mdma_filter) |
267 | mask = port_ops->mdma_filter(drive); | |
b4e44369 SS |
268 | else |
269 | mask = hwif->mwdma_mask; | |
4dde4492 | 270 | mask &= id[ATA_ID_MWDMA_MODES]; |
2d5eaa6d BZ |
271 | break; |
272 | case XFER_SW_DMA_0: | |
4dde4492 BZ |
273 | if (id[ATA_ID_FIELD_VALID] & 2) { |
274 | mask = id[ATA_ID_SWDMA_MODES] & hwif->swdma_mask; | |
48fb2688 BZ |
275 | } else if (id[ATA_ID_OLD_DMA_MODES] >> 8) { |
276 | u8 mode = id[ATA_ID_OLD_DMA_MODES] >> 8; | |
15a4f943 BZ |
277 | |
278 | /* | |
279 | * if the mode is valid convert it to the mask | |
280 | * (the maximum allowed mode is XFER_SW_DMA_2) | |
281 | */ | |
282 | if (mode <= 2) | |
283 | mask = ((2 << mode) - 1) & hwif->swdma_mask; | |
284 | } | |
2d5eaa6d BZ |
285 | break; |
286 | default: | |
287 | BUG(); | |
288 | break; | |
289 | } | |
290 | ||
291 | return mask; | |
292 | } | |
293 | ||
294 | /** | |
7670df73 | 295 | * ide_find_dma_mode - compute DMA speed |
2d5eaa6d | 296 | * @drive: IDE device |
7670df73 BZ |
297 | * @req_mode: requested mode |
298 | * | |
299 | * Checks the drive/host capabilities and finds the speed to use for | |
300 | * the DMA transfer. The speed is then limited by the requested mode. | |
2d5eaa6d | 301 | * |
7670df73 BZ |
302 | * Returns 0 if the drive/host combination is incapable of DMA transfers |
303 | * or if the requested mode is not a DMA mode. | |
2d5eaa6d BZ |
304 | */ |
305 | ||
7670df73 | 306 | u8 ide_find_dma_mode(ide_drive_t *drive, u8 req_mode) |
2d5eaa6d BZ |
307 | { |
308 | ide_hwif_t *hwif = drive->hwif; | |
309 | unsigned int mask; | |
310 | int x, i; | |
311 | u8 mode = 0; | |
312 | ||
33c1002e BZ |
313 | if (drive->media != ide_disk) { |
314 | if (hwif->host_flags & IDE_HFLAG_NO_ATAPI_DMA) | |
315 | return 0; | |
316 | } | |
2d5eaa6d BZ |
317 | |
318 | for (i = 0; i < ARRAY_SIZE(xfer_mode_bases); i++) { | |
7670df73 BZ |
319 | if (req_mode < xfer_mode_bases[i]) |
320 | continue; | |
321 | mask = ide_get_mode_mask(drive, xfer_mode_bases[i], req_mode); | |
2d5eaa6d BZ |
322 | x = fls(mask) - 1; |
323 | if (x >= 0) { | |
324 | mode = xfer_mode_bases[i] + x; | |
325 | break; | |
326 | } | |
327 | } | |
328 | ||
75d7d963 BZ |
329 | if (hwif->chipset == ide_acorn && mode == 0) { |
330 | /* | |
331 | * is this correct? | |
332 | */ | |
4dde4492 BZ |
333 | if (ide_dma_good_drive(drive) && |
334 | drive->id[ATA_ID_EIDE_DMA_TIME] < 150) | |
75d7d963 BZ |
335 | mode = XFER_MW_DMA_1; |
336 | } | |
337 | ||
3ab7efe8 BZ |
338 | mode = min(mode, req_mode); |
339 | ||
340 | printk(KERN_INFO "%s: %s mode selected\n", drive->name, | |
d34887da | 341 | mode ? ide_xfer_verbose(mode) : "no DMA"); |
2d5eaa6d | 342 | |
3ab7efe8 | 343 | return mode; |
2d5eaa6d | 344 | } |
7670df73 | 345 | EXPORT_SYMBOL_GPL(ide_find_dma_mode); |
2d5eaa6d | 346 | |
0ae2e178 | 347 | static int ide_tune_dma(ide_drive_t *drive) |
29e744d0 | 348 | { |
8704de8f | 349 | ide_hwif_t *hwif = drive->hwif; |
29e744d0 BZ |
350 | u8 speed; |
351 | ||
97100fc8 BZ |
352 | if (ata_id_has_dma(drive->id) == 0 || |
353 | (drive->dev_flags & IDE_DFLAG_NODMA)) | |
122ab088 BZ |
354 | return 0; |
355 | ||
356 | /* consult the list of known "bad" drives */ | |
357 | if (__ide_dma_bad_drive(drive)) | |
29e744d0 BZ |
358 | return 0; |
359 | ||
3ab7efe8 BZ |
360 | if (ide_id_dma_bug(drive)) |
361 | return 0; | |
362 | ||
8704de8f | 363 | if (hwif->host_flags & IDE_HFLAG_TRUST_BIOS_FOR_DMA) |
0ae2e178 BZ |
364 | return config_drive_for_dma(drive); |
365 | ||
29e744d0 BZ |
366 | speed = ide_max_dma_mode(drive); |
367 | ||
951784b6 BZ |
368 | if (!speed) |
369 | return 0; | |
29e744d0 | 370 | |
88b2b32b | 371 | if (ide_set_dma_mode(drive, speed)) |
4728d546 | 372 | return 0; |
29e744d0 | 373 | |
4728d546 | 374 | return 1; |
29e744d0 BZ |
375 | } |
376 | ||
0ae2e178 BZ |
377 | static int ide_dma_check(ide_drive_t *drive) |
378 | { | |
379 | ide_hwif_t *hwif = drive->hwif; | |
0ae2e178 | 380 | |
ba4b2e60 | 381 | if (ide_tune_dma(drive)) |
0ae2e178 BZ |
382 | return 0; |
383 | ||
384 | /* TODO: always do PIO fallback */ | |
385 | if (hwif->host_flags & IDE_HFLAG_TRUST_BIOS_FOR_DMA) | |
386 | return -1; | |
387 | ||
388 | ide_set_max_pio(drive); | |
389 | ||
ba4b2e60 | 390 | return -1; |
0ae2e178 BZ |
391 | } |
392 | ||
3ab7efe8 | 393 | int ide_id_dma_bug(ide_drive_t *drive) |
1da177e4 | 394 | { |
4dde4492 | 395 | u16 *id = drive->id; |
1da177e4 | 396 | |
4dde4492 BZ |
397 | if (id[ATA_ID_FIELD_VALID] & 4) { |
398 | if ((id[ATA_ID_UDMA_MODES] >> 8) && | |
399 | (id[ATA_ID_MWDMA_MODES] >> 8)) | |
3ab7efe8 | 400 | goto err_out; |
4dde4492 BZ |
401 | } else if (id[ATA_ID_FIELD_VALID] & 2) { |
402 | if ((id[ATA_ID_MWDMA_MODES] >> 8) && | |
403 | (id[ATA_ID_SWDMA_MODES] >> 8)) | |
3ab7efe8 | 404 | goto err_out; |
1da177e4 | 405 | } |
3ab7efe8 BZ |
406 | return 0; |
407 | err_out: | |
408 | printk(KERN_ERR "%s: bad DMA info in identify block\n", drive->name); | |
409 | return 1; | |
1da177e4 LT |
410 | } |
411 | ||
3608b5d7 BZ |
412 | int ide_set_dma(ide_drive_t *drive) |
413 | { | |
3608b5d7 BZ |
414 | int rc; |
415 | ||
7b905994 BZ |
416 | /* |
417 | * Force DMAing for the beginning of the check. | |
418 | * Some chipsets appear to do interesting | |
419 | * things, if not checked and cleared. | |
420 | * PARANOIA!!! | |
421 | */ | |
4a546e04 | 422 | ide_dma_off_quietly(drive); |
3608b5d7 | 423 | |
7b905994 BZ |
424 | rc = ide_dma_check(drive); |
425 | if (rc) | |
426 | return rc; | |
3608b5d7 | 427 | |
4a546e04 BZ |
428 | ide_dma_on(drive); |
429 | ||
430 | return 0; | |
3608b5d7 BZ |
431 | } |
432 | ||
578cfa0d BZ |
433 | void ide_check_dma_crc(ide_drive_t *drive) |
434 | { | |
435 | u8 mode; | |
436 | ||
437 | ide_dma_off_quietly(drive); | |
438 | drive->crc_count = 0; | |
439 | mode = drive->current_speed; | |
440 | /* | |
441 | * Don't try non Ultra-DMA modes without iCRC's. Force the | |
442 | * device to PIO and make the user enable SWDMA/MWDMA modes. | |
443 | */ | |
444 | if (mode > XFER_UDMA_0 && mode <= XFER_UDMA_7) | |
445 | mode--; | |
446 | else | |
447 | mode = XFER_PIO_4; | |
448 | ide_set_xfer_rate(drive, mode); | |
449 | if (drive->current_speed >= XFER_SW_DMA_0) | |
450 | ide_dma_on(drive); | |
451 | } | |
452 | ||
de23ec9c | 453 | void ide_dma_lost_irq(ide_drive_t *drive) |
1da177e4 | 454 | { |
de23ec9c | 455 | printk(KERN_ERR "%s: DMA interrupt recovery\n", drive->name); |
1da177e4 | 456 | } |
de23ec9c | 457 | EXPORT_SYMBOL_GPL(ide_dma_lost_irq); |
1da177e4 | 458 | |
ffa15a69 | 459 | void ide_dma_timeout(ide_drive_t *drive) |
1da177e4 | 460 | { |
db3f99ef | 461 | ide_hwif_t *hwif = drive->hwif; |
c283f5db | 462 | |
1da177e4 | 463 | printk(KERN_ERR "%s: timeout waiting for DMA\n", drive->name); |
1da177e4 | 464 | |
5e37bdc0 | 465 | if (hwif->dma_ops->dma_test_irq(drive)) |
c283f5db SS |
466 | return; |
467 | ||
ffa15a69 BZ |
468 | ide_dump_status(drive, "DMA timeout", hwif->tp_ops->read_status(hwif)); |
469 | ||
5e37bdc0 | 470 | hwif->dma_ops->dma_end(drive); |
1da177e4 | 471 | } |
ffa15a69 | 472 | EXPORT_SYMBOL_GPL(ide_dma_timeout); |
1da177e4 | 473 | |
65ca5377 BZ |
474 | /* |
475 | * un-busy the port etc, and clear any pending DMA status. we want to | |
476 | * retry the current request in pio mode instead of risking tossing it | |
477 | * all away | |
478 | */ | |
479 | ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error) | |
480 | { | |
481 | ide_hwif_t *hwif = drive->hwif; | |
482 | struct request *rq; | |
483 | ide_startstop_t ret = ide_stopped; | |
484 | ||
485 | /* | |
486 | * end current dma transaction | |
487 | */ | |
488 | ||
489 | if (error < 0) { | |
490 | printk(KERN_WARNING "%s: DMA timeout error\n", drive->name); | |
491 | (void)hwif->dma_ops->dma_end(drive); | |
492 | ret = ide_error(drive, "dma timeout error", | |
493 | hwif->tp_ops->read_status(hwif)); | |
494 | } else { | |
495 | printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name); | |
496 | hwif->dma_ops->dma_timeout(drive); | |
497 | } | |
498 | ||
499 | /* | |
500 | * disable dma for now, but remember that we did so because of | |
501 | * a timeout -- we'll reenable after we finish this next request | |
502 | * (or rather the first chunk of it) in pio. | |
503 | */ | |
504 | drive->dev_flags |= IDE_DFLAG_DMA_PIO_RETRY; | |
505 | drive->retry_pio++; | |
506 | ide_dma_off_quietly(drive); | |
507 | ||
508 | /* | |
509 | * un-busy drive etc and make sure request is sane | |
510 | */ | |
511 | ||
512 | rq = hwif->rq; | |
513 | if (!rq) | |
514 | goto out; | |
515 | ||
516 | hwif->rq = NULL; | |
517 | ||
518 | rq->errors = 0; | |
519 | ||
520 | if (!rq->bio) | |
521 | goto out; | |
522 | ||
523 | rq->sector = rq->bio->bi_sector; | |
524 | rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9; | |
525 | rq->hard_cur_sectors = rq->current_nr_sectors; | |
526 | rq->buffer = bio_data(rq->bio); | |
527 | out: | |
528 | return ret; | |
529 | } | |
530 | ||
0d1bad21 | 531 | void ide_release_dma_engine(ide_hwif_t *hwif) |
1da177e4 LT |
532 | { |
533 | if (hwif->dmatable_cpu) { | |
2bbd57ca | 534 | int prd_size = hwif->prd_max_nents * hwif->prd_ent_size; |
36501650 | 535 | |
2bbd57ca BZ |
536 | dma_free_coherent(hwif->dev, prd_size, |
537 | hwif->dmatable_cpu, hwif->dmatable_dma); | |
1da177e4 LT |
538 | hwif->dmatable_cpu = NULL; |
539 | } | |
1da177e4 | 540 | } |
2bbd57ca | 541 | EXPORT_SYMBOL_GPL(ide_release_dma_engine); |
1da177e4 | 542 | |
b8e73fba | 543 | int ide_allocate_dma_engine(ide_hwif_t *hwif) |
1da177e4 | 544 | { |
2bbd57ca | 545 | int prd_size; |
36501650 | 546 | |
2bbd57ca BZ |
547 | if (hwif->prd_max_nents == 0) |
548 | hwif->prd_max_nents = PRD_ENTRIES; | |
549 | if (hwif->prd_ent_size == 0) | |
550 | hwif->prd_ent_size = PRD_BYTES; | |
1da177e4 | 551 | |
2bbd57ca | 552 | prd_size = hwif->prd_max_nents * hwif->prd_ent_size; |
1da177e4 | 553 | |
2bbd57ca BZ |
554 | hwif->dmatable_cpu = dma_alloc_coherent(hwif->dev, prd_size, |
555 | &hwif->dmatable_dma, | |
556 | GFP_ATOMIC); | |
557 | if (hwif->dmatable_cpu == NULL) { | |
558 | printk(KERN_ERR "%s: unable to allocate PRD table\n", | |
5e59c236 | 559 | hwif->name); |
2bbd57ca BZ |
560 | return -ENOMEM; |
561 | } | |
1da177e4 | 562 | |
2bbd57ca | 563 | return 0; |
1da177e4 | 564 | } |
b8e73fba | 565 | EXPORT_SYMBOL_GPL(ide_allocate_dma_engine); |