Root/
1 | /* |
2 | * IDE DMA support (including IDE PCI BM-DMA). |
3 | * |
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 |
7 | * |
8 | * May be copied or modified under the terms of the GNU General Public License |
9 | * |
10 | * DMA is supported for all IDE devices (disk drives, cdroms, tapes, floppies). |
11 | */ |
12 | |
13 | /* |
14 | * Special Thanks to Mark for his Six years of work. |
15 | */ |
16 | |
17 | /* |
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! |
29 | */ |
30 | |
31 | #include <linux/types.h> |
32 | #include <linux/gfp.h> |
33 | #include <linux/kernel.h> |
34 | #include <linux/export.h> |
35 | #include <linux/ide.h> |
36 | #include <linux/scatterlist.h> |
37 | #include <linux/dma-mapping.h> |
38 | |
39 | static const struct drive_list_entry drive_whitelist[] = { |
40 | { "Micropolis 2112A" , NULL }, |
41 | { "CONNER CTMA 4000" , NULL }, |
42 | { "CONNER CTT8000-A" , NULL }, |
43 | { "ST34342A" , NULL }, |
44 | { NULL , NULL } |
45 | }; |
46 | |
47 | static const struct drive_list_entry drive_blacklist[] = { |
48 | { "WDC AC11000H" , NULL }, |
49 | { "WDC AC22100H" , NULL }, |
50 | { "WDC AC32500H" , NULL }, |
51 | { "WDC AC33100H" , NULL }, |
52 | { "WDC AC31600H" , NULL }, |
53 | { "WDC AC32100H" , "24.09P07" }, |
54 | { "WDC AC23200L" , "21.10N21" }, |
55 | { "Compaq CRD-8241B" , NULL }, |
56 | { "CRD-8400B" , NULL }, |
57 | { "CRD-8480B", NULL }, |
58 | { "CRD-8482B", NULL }, |
59 | { "CRD-84" , NULL }, |
60 | { "SanDisk SDP3B" , NULL }, |
61 | { "SanDisk SDP3B-64" , NULL }, |
62 | { "SANYO CD-ROM CRD" , NULL }, |
63 | { "HITACHI CDR-8" , NULL }, |
64 | { "HITACHI CDR-8335" , NULL }, |
65 | { "HITACHI CDR-8435" , NULL }, |
66 | { "Toshiba CD-ROM XM-6202B" , NULL }, |
67 | { "TOSHIBA CD-ROM XM-1702BC", NULL }, |
68 | { "CD-532E-A" , NULL }, |
69 | { "E-IDE CD-ROM CR-840", NULL }, |
70 | { "CD-ROM Drive/F5A", NULL }, |
71 | { "WPI CDD-820", NULL }, |
72 | { "SAMSUNG CD-ROM SC-148C", NULL }, |
73 | { "SAMSUNG CD-ROM SC", NULL }, |
74 | { "ATAPI CD-ROM DRIVE 40X MAXIMUM", NULL }, |
75 | { "_NEC DV5800A", NULL }, |
76 | { "SAMSUNG CD-ROM SN-124", "N001" }, |
77 | { "Seagate STT20000A", NULL }, |
78 | { "CD-ROM CDR_U200", "1.09" }, |
79 | { NULL , NULL } |
80 | |
81 | }; |
82 | |
83 | /** |
84 | * ide_dma_intr - IDE DMA interrupt handler |
85 | * @drive: the drive the interrupt is for |
86 | * |
87 | * Handle an interrupt completing a read/write DMA transfer on an |
88 | * IDE device |
89 | */ |
90 | |
91 | ide_startstop_t ide_dma_intr(ide_drive_t *drive) |
92 | { |
93 | ide_hwif_t *hwif = drive->hwif; |
94 | struct ide_cmd *cmd = &hwif->cmd; |
95 | u8 stat = 0, dma_stat = 0; |
96 | |
97 | drive->waiting_for_dma = 0; |
98 | dma_stat = hwif->dma_ops->dma_end(drive); |
99 | ide_dma_unmap_sg(drive, cmd); |
100 | stat = hwif->tp_ops->read_status(hwif); |
101 | |
102 | if (OK_STAT(stat, DRIVE_READY, drive->bad_wstat | ATA_DRQ)) { |
103 | if (!dma_stat) { |
104 | if ((cmd->tf_flags & IDE_TFLAG_FS) == 0) |
105 | ide_finish_cmd(drive, cmd, stat); |
106 | else |
107 | ide_complete_rq(drive, 0, |
108 | blk_rq_sectors(cmd->rq) << 9); |
109 | return ide_stopped; |
110 | } |
111 | printk(KERN_ERR "%s: %s: bad DMA status (0x%02x)\n", |
112 | drive->name, __func__, dma_stat); |
113 | } |
114 | return ide_error(drive, "dma_intr", stat); |
115 | } |
116 | |
117 | int ide_dma_good_drive(ide_drive_t *drive) |
118 | { |
119 | return ide_in_drive_list(drive->id, drive_whitelist); |
120 | } |
121 | |
122 | /** |
123 | * ide_dma_map_sg - map IDE scatter gather for DMA I/O |
124 | * @drive: the drive to map the DMA table for |
125 | * @cmd: command |
126 | * |
127 | * Perform the DMA mapping magic necessary to access the source or |
128 | * target buffers of a request via DMA. The lower layers of the |
129 | * kernel provide the necessary cache management so that we can |
130 | * operate in a portable fashion. |
131 | */ |
132 | |
133 | static int ide_dma_map_sg(ide_drive_t *drive, struct ide_cmd *cmd) |
134 | { |
135 | ide_hwif_t *hwif = drive->hwif; |
136 | struct scatterlist *sg = hwif->sg_table; |
137 | int i; |
138 | |
139 | if (cmd->tf_flags & IDE_TFLAG_WRITE) |
140 | cmd->sg_dma_direction = DMA_TO_DEVICE; |
141 | else |
142 | cmd->sg_dma_direction = DMA_FROM_DEVICE; |
143 | |
144 | i = dma_map_sg(hwif->dev, sg, cmd->sg_nents, cmd->sg_dma_direction); |
145 | if (i) { |
146 | cmd->orig_sg_nents = cmd->sg_nents; |
147 | cmd->sg_nents = i; |
148 | } |
149 | |
150 | return i; |
151 | } |
152 | |
153 | /** |
154 | * ide_dma_unmap_sg - clean up DMA mapping |
155 | * @drive: The drive to unmap |
156 | * |
157 | * Teardown mappings after DMA has completed. This must be called |
158 | * after the completion of each use of ide_build_dmatable and before |
159 | * the next use of ide_build_dmatable. Failure to do so will cause |
160 | * an oops as only one mapping can be live for each target at a given |
161 | * time. |
162 | */ |
163 | |
164 | void ide_dma_unmap_sg(ide_drive_t *drive, struct ide_cmd *cmd) |
165 | { |
166 | ide_hwif_t *hwif = drive->hwif; |
167 | |
168 | dma_unmap_sg(hwif->dev, hwif->sg_table, cmd->orig_sg_nents, |
169 | cmd->sg_dma_direction); |
170 | } |
171 | EXPORT_SYMBOL_GPL(ide_dma_unmap_sg); |
172 | |
173 | /** |
174 | * ide_dma_off_quietly - Generic DMA kill |
175 | * @drive: drive to control |
176 | * |
177 | * Turn off the current DMA on this IDE controller. |
178 | */ |
179 | |
180 | void ide_dma_off_quietly(ide_drive_t *drive) |
181 | { |
182 | drive->dev_flags &= ~IDE_DFLAG_USING_DMA; |
183 | ide_toggle_bounce(drive, 0); |
184 | |
185 | drive->hwif->dma_ops->dma_host_set(drive, 0); |
186 | } |
187 | EXPORT_SYMBOL(ide_dma_off_quietly); |
188 | |
189 | /** |
190 | * ide_dma_off - disable DMA on a device |
191 | * @drive: drive to disable DMA on |
192 | * |
193 | * Disable IDE DMA for a device on this IDE controller. |
194 | * Inform the user that DMA has been disabled. |
195 | */ |
196 | |
197 | void ide_dma_off(ide_drive_t *drive) |
198 | { |
199 | printk(KERN_INFO "%s: DMA disabled\n", drive->name); |
200 | ide_dma_off_quietly(drive); |
201 | } |
202 | EXPORT_SYMBOL(ide_dma_off); |
203 | |
204 | /** |
205 | * ide_dma_on - Enable DMA on a device |
206 | * @drive: drive to enable DMA on |
207 | * |
208 | * Enable IDE DMA for a device on this IDE controller. |
209 | */ |
210 | |
211 | void ide_dma_on(ide_drive_t *drive) |
212 | { |
213 | drive->dev_flags |= IDE_DFLAG_USING_DMA; |
214 | ide_toggle_bounce(drive, 1); |
215 | |
216 | drive->hwif->dma_ops->dma_host_set(drive, 1); |
217 | } |
218 | |
219 | int __ide_dma_bad_drive(ide_drive_t *drive) |
220 | { |
221 | u16 *id = drive->id; |
222 | |
223 | int blacklist = ide_in_drive_list(id, drive_blacklist); |
224 | if (blacklist) { |
225 | printk(KERN_WARNING "%s: Disabling (U)DMA for %s (blacklisted)\n", |
226 | drive->name, (char *)&id[ATA_ID_PROD]); |
227 | return blacklist; |
228 | } |
229 | return 0; |
230 | } |
231 | EXPORT_SYMBOL(__ide_dma_bad_drive); |
232 | |
233 | static const u8 xfer_mode_bases[] = { |
234 | XFER_UDMA_0, |
235 | XFER_MW_DMA_0, |
236 | XFER_SW_DMA_0, |
237 | }; |
238 | |
239 | static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base, u8 req_mode) |
240 | { |
241 | u16 *id = drive->id; |
242 | ide_hwif_t *hwif = drive->hwif; |
243 | const struct ide_port_ops *port_ops = hwif->port_ops; |
244 | unsigned int mask = 0; |
245 | |
246 | switch (base) { |
247 | case XFER_UDMA_0: |
248 | if ((id[ATA_ID_FIELD_VALID] & 4) == 0) |
249 | break; |
250 | mask = id[ATA_ID_UDMA_MODES]; |
251 | if (port_ops && port_ops->udma_filter) |
252 | mask &= port_ops->udma_filter(drive); |
253 | else |
254 | mask &= hwif->ultra_mask; |
255 | |
256 | /* |
257 | * avoid false cable warning from eighty_ninty_three() |
258 | */ |
259 | if (req_mode > XFER_UDMA_2) { |
260 | if ((mask & 0x78) && (eighty_ninty_three(drive) == 0)) |
261 | mask &= 0x07; |
262 | } |
263 | break; |
264 | case XFER_MW_DMA_0: |
265 | mask = id[ATA_ID_MWDMA_MODES]; |
266 | |
267 | /* Also look for the CF specific MWDMA modes... */ |
268 | if (ata_id_is_cfa(id) && (id[ATA_ID_CFA_MODES] & 0x38)) { |
269 | u8 mode = ((id[ATA_ID_CFA_MODES] & 0x38) >> 3) - 1; |
270 | |
271 | mask |= ((2 << mode) - 1) << 3; |
272 | } |
273 | |
274 | if (port_ops && port_ops->mdma_filter) |
275 | mask &= port_ops->mdma_filter(drive); |
276 | else |
277 | mask &= hwif->mwdma_mask; |
278 | break; |
279 | case XFER_SW_DMA_0: |
280 | mask = id[ATA_ID_SWDMA_MODES]; |
281 | if (!(mask & ATA_SWDMA2) && (id[ATA_ID_OLD_DMA_MODES] >> 8)) { |
282 | u8 mode = id[ATA_ID_OLD_DMA_MODES] >> 8; |
283 | |
284 | /* |
285 | * if the mode is valid convert it to the mask |
286 | * (the maximum allowed mode is XFER_SW_DMA_2) |
287 | */ |
288 | if (mode <= 2) |
289 | mask = (2 << mode) - 1; |
290 | } |
291 | mask &= hwif->swdma_mask; |
292 | break; |
293 | default: |
294 | BUG(); |
295 | break; |
296 | } |
297 | |
298 | return mask; |
299 | } |
300 | |
301 | /** |
302 | * ide_find_dma_mode - compute DMA speed |
303 | * @drive: IDE device |
304 | * @req_mode: requested mode |
305 | * |
306 | * Checks the drive/host capabilities and finds the speed to use for |
307 | * the DMA transfer. The speed is then limited by the requested mode. |
308 | * |
309 | * Returns 0 if the drive/host combination is incapable of DMA transfers |
310 | * or if the requested mode is not a DMA mode. |
311 | */ |
312 | |
313 | u8 ide_find_dma_mode(ide_drive_t *drive, u8 req_mode) |
314 | { |
315 | ide_hwif_t *hwif = drive->hwif; |
316 | unsigned int mask; |
317 | int x, i; |
318 | u8 mode = 0; |
319 | |
320 | if (drive->media != ide_disk) { |
321 | if (hwif->host_flags & IDE_HFLAG_NO_ATAPI_DMA) |
322 | return 0; |
323 | } |
324 | |
325 | for (i = 0; i < ARRAY_SIZE(xfer_mode_bases); i++) { |
326 | if (req_mode < xfer_mode_bases[i]) |
327 | continue; |
328 | mask = ide_get_mode_mask(drive, xfer_mode_bases[i], req_mode); |
329 | x = fls(mask) - 1; |
330 | if (x >= 0) { |
331 | mode = xfer_mode_bases[i] + x; |
332 | break; |
333 | } |
334 | } |
335 | |
336 | if (hwif->chipset == ide_acorn && mode == 0) { |
337 | /* |
338 | * is this correct? |
339 | */ |
340 | if (ide_dma_good_drive(drive) && |
341 | drive->id[ATA_ID_EIDE_DMA_TIME] < 150) |
342 | mode = XFER_MW_DMA_1; |
343 | } |
344 | |
345 | mode = min(mode, req_mode); |
346 | |
347 | printk(KERN_INFO "%s: %s mode selected\n", drive->name, |
348 | mode ? ide_xfer_verbose(mode) : "no DMA"); |
349 | |
350 | return mode; |
351 | } |
352 | |
353 | static int ide_tune_dma(ide_drive_t *drive) |
354 | { |
355 | ide_hwif_t *hwif = drive->hwif; |
356 | u8 speed; |
357 | |
358 | if (ata_id_has_dma(drive->id) == 0 || |
359 | (drive->dev_flags & IDE_DFLAG_NODMA)) |
360 | return 0; |
361 | |
362 | /* consult the list of known "bad" drives */ |
363 | if (__ide_dma_bad_drive(drive)) |
364 | return 0; |
365 | |
366 | if (hwif->host_flags & IDE_HFLAG_TRUST_BIOS_FOR_DMA) |
367 | return config_drive_for_dma(drive); |
368 | |
369 | speed = ide_max_dma_mode(drive); |
370 | |
371 | if (!speed) |
372 | return 0; |
373 | |
374 | if (ide_set_dma_mode(drive, speed)) |
375 | return 0; |
376 | |
377 | return 1; |
378 | } |
379 | |
380 | static int ide_dma_check(ide_drive_t *drive) |
381 | { |
382 | ide_hwif_t *hwif = drive->hwif; |
383 | |
384 | if (ide_tune_dma(drive)) |
385 | return 0; |
386 | |
387 | /* TODO: always do PIO fallback */ |
388 | if (hwif->host_flags & IDE_HFLAG_TRUST_BIOS_FOR_DMA) |
389 | return -1; |
390 | |
391 | ide_set_max_pio(drive); |
392 | |
393 | return -1; |
394 | } |
395 | |
396 | int ide_set_dma(ide_drive_t *drive) |
397 | { |
398 | int rc; |
399 | |
400 | /* |
401 | * Force DMAing for the beginning of the check. |
402 | * Some chipsets appear to do interesting |
403 | * things, if not checked and cleared. |
404 | * PARANOIA!!! |
405 | */ |
406 | ide_dma_off_quietly(drive); |
407 | |
408 | rc = ide_dma_check(drive); |
409 | if (rc) |
410 | return rc; |
411 | |
412 | ide_dma_on(drive); |
413 | |
414 | return 0; |
415 | } |
416 | |
417 | void ide_check_dma_crc(ide_drive_t *drive) |
418 | { |
419 | u8 mode; |
420 | |
421 | ide_dma_off_quietly(drive); |
422 | drive->crc_count = 0; |
423 | mode = drive->current_speed; |
424 | /* |
425 | * Don't try non Ultra-DMA modes without iCRC's. Force the |
426 | * device to PIO and make the user enable SWDMA/MWDMA modes. |
427 | */ |
428 | if (mode > XFER_UDMA_0 && mode <= XFER_UDMA_7) |
429 | mode--; |
430 | else |
431 | mode = XFER_PIO_4; |
432 | ide_set_xfer_rate(drive, mode); |
433 | if (drive->current_speed >= XFER_SW_DMA_0) |
434 | ide_dma_on(drive); |
435 | } |
436 | |
437 | void ide_dma_lost_irq(ide_drive_t *drive) |
438 | { |
439 | printk(KERN_ERR "%s: DMA interrupt recovery\n", drive->name); |
440 | } |
441 | EXPORT_SYMBOL_GPL(ide_dma_lost_irq); |
442 | |
443 | /* |
444 | * un-busy the port etc, and clear any pending DMA status. we want to |
445 | * retry the current request in pio mode instead of risking tossing it |
446 | * all away |
447 | */ |
448 | ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error) |
449 | { |
450 | ide_hwif_t *hwif = drive->hwif; |
451 | const struct ide_dma_ops *dma_ops = hwif->dma_ops; |
452 | struct ide_cmd *cmd = &hwif->cmd; |
453 | ide_startstop_t ret = ide_stopped; |
454 | |
455 | /* |
456 | * end current dma transaction |
457 | */ |
458 | |
459 | if (error < 0) { |
460 | printk(KERN_WARNING "%s: DMA timeout error\n", drive->name); |
461 | drive->waiting_for_dma = 0; |
462 | (void)dma_ops->dma_end(drive); |
463 | ide_dma_unmap_sg(drive, cmd); |
464 | ret = ide_error(drive, "dma timeout error", |
465 | hwif->tp_ops->read_status(hwif)); |
466 | } else { |
467 | printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name); |
468 | if (dma_ops->dma_clear) |
469 | dma_ops->dma_clear(drive); |
470 | printk(KERN_ERR "%s: timeout waiting for DMA\n", drive->name); |
471 | if (dma_ops->dma_test_irq(drive) == 0) { |
472 | ide_dump_status(drive, "DMA timeout", |
473 | hwif->tp_ops->read_status(hwif)); |
474 | drive->waiting_for_dma = 0; |
475 | (void)dma_ops->dma_end(drive); |
476 | ide_dma_unmap_sg(drive, cmd); |
477 | } |
478 | } |
479 | |
480 | /* |
481 | * disable dma for now, but remember that we did so because of |
482 | * a timeout -- we'll reenable after we finish this next request |
483 | * (or rather the first chunk of it) in pio. |
484 | */ |
485 | drive->dev_flags |= IDE_DFLAG_DMA_PIO_RETRY; |
486 | drive->retry_pio++; |
487 | ide_dma_off_quietly(drive); |
488 | |
489 | /* |
490 | * make sure request is sane |
491 | */ |
492 | if (hwif->rq) |
493 | hwif->rq->errors = 0; |
494 | return ret; |
495 | } |
496 | |
497 | void ide_release_dma_engine(ide_hwif_t *hwif) |
498 | { |
499 | if (hwif->dmatable_cpu) { |
500 | int prd_size = hwif->prd_max_nents * hwif->prd_ent_size; |
501 | |
502 | dma_free_coherent(hwif->dev, prd_size, |
503 | hwif->dmatable_cpu, hwif->dmatable_dma); |
504 | hwif->dmatable_cpu = NULL; |
505 | } |
506 | } |
507 | EXPORT_SYMBOL_GPL(ide_release_dma_engine); |
508 | |
509 | int ide_allocate_dma_engine(ide_hwif_t *hwif) |
510 | { |
511 | int prd_size; |
512 | |
513 | if (hwif->prd_max_nents == 0) |
514 | hwif->prd_max_nents = PRD_ENTRIES; |
515 | if (hwif->prd_ent_size == 0) |
516 | hwif->prd_ent_size = PRD_BYTES; |
517 | |
518 | prd_size = hwif->prd_max_nents * hwif->prd_ent_size; |
519 | |
520 | hwif->dmatable_cpu = dma_alloc_coherent(hwif->dev, prd_size, |
521 | &hwif->dmatable_dma, |
522 | GFP_ATOMIC); |
523 | if (hwif->dmatable_cpu == NULL) { |
524 | printk(KERN_ERR "%s: unable to allocate PRD table\n", |
525 | hwif->name); |
526 | return -ENOMEM; |
527 | } |
528 | |
529 | return 0; |
530 | } |
531 | EXPORT_SYMBOL_GPL(ide_allocate_dma_engine); |
532 | |
533 | int ide_dma_prepare(ide_drive_t *drive, struct ide_cmd *cmd) |
534 | { |
535 | const struct ide_dma_ops *dma_ops = drive->hwif->dma_ops; |
536 | |
537 | if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0 || |
538 | (dma_ops->dma_check && dma_ops->dma_check(drive, cmd))) |
539 | goto out; |
540 | ide_map_sg(drive, cmd); |
541 | if (ide_dma_map_sg(drive, cmd) == 0) |
542 | goto out_map; |
543 | if (dma_ops->dma_setup(drive, cmd)) |
544 | goto out_dma_unmap; |
545 | drive->waiting_for_dma = 1; |
546 | return 0; |
547 | out_dma_unmap: |
548 | ide_dma_unmap_sg(drive, cmd); |
549 | out_map: |
550 | ide_map_sg(drive, cmd); |
551 | out: |
552 | return 1; |
553 | } |
554 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9