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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
39static 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
47static 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
91ide_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, BLK_STS_OK,
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
117int 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
133static 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
164void 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}
171EXPORT_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
180void ide_dma_off_quietly(ide_drive_t *drive)
181{
182 drive->dev_flags &= ~IDE_DFLAG_USING_DMA;
183
184 drive->hwif->dma_ops->dma_host_set(drive, 0);
185}
186EXPORT_SYMBOL(ide_dma_off_quietly);
187
188/**
189 * ide_dma_off - disable DMA on a device
190 * @drive: drive to disable DMA on
191 *
192 * Disable IDE DMA for a device on this IDE controller.
193 * Inform the user that DMA has been disabled.
194 */
195
196void ide_dma_off(ide_drive_t *drive)
197{
198 printk(KERN_INFO "%s: DMA disabled\n", drive->name);
199 ide_dma_off_quietly(drive);
200}
201EXPORT_SYMBOL(ide_dma_off);
202
203/**
204 * ide_dma_on - Enable DMA on a device
205 * @drive: drive to enable DMA on
206 *
207 * Enable IDE DMA for a device on this IDE controller.
208 */
209
210void ide_dma_on(ide_drive_t *drive)
211{
212 drive->dev_flags |= IDE_DFLAG_USING_DMA;
213
214 drive->hwif->dma_ops->dma_host_set(drive, 1);
215}
216
217int __ide_dma_bad_drive(ide_drive_t *drive)
218{
219 u16 *id = drive->id;
220
221 int blacklist = ide_in_drive_list(id, drive_blacklist);
222 if (blacklist) {
223 printk(KERN_WARNING "%s: Disabling (U)DMA for %s (blacklisted)\n",
224 drive->name, (char *)&id[ATA_ID_PROD]);
225 return blacklist;
226 }
227 return 0;
228}
229EXPORT_SYMBOL(__ide_dma_bad_drive);
230
231static const u8 xfer_mode_bases[] = {
232 XFER_UDMA_0,
233 XFER_MW_DMA_0,
234 XFER_SW_DMA_0,
235};
236
237static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base, u8 req_mode)
238{
239 u16 *id = drive->id;
240 ide_hwif_t *hwif = drive->hwif;
241 const struct ide_port_ops *port_ops = hwif->port_ops;
242 unsigned int mask = 0;
243
244 switch (base) {
245 case XFER_UDMA_0:
246 if ((id[ATA_ID_FIELD_VALID] & 4) == 0)
247 break;
248 mask = id[ATA_ID_UDMA_MODES];
249 if (port_ops && port_ops->udma_filter)
250 mask &= port_ops->udma_filter(drive);
251 else
252 mask &= hwif->ultra_mask;
253
254 /*
255 * avoid false cable warning from eighty_ninty_three()
256 */
257 if (req_mode > XFER_UDMA_2) {
258 if ((mask & 0x78) && (eighty_ninty_three(drive) == 0))
259 mask &= 0x07;
260 }
261 break;
262 case XFER_MW_DMA_0:
263 mask = id[ATA_ID_MWDMA_MODES];
264
265 /* Also look for the CF specific MWDMA modes... */
266 if (ata_id_is_cfa(id) && (id[ATA_ID_CFA_MODES] & 0x38)) {
267 u8 mode = ((id[ATA_ID_CFA_MODES] & 0x38) >> 3) - 1;
268
269 mask |= ((2 << mode) - 1) << 3;
270 }
271
272 if (port_ops && port_ops->mdma_filter)
273 mask &= port_ops->mdma_filter(drive);
274 else
275 mask &= hwif->mwdma_mask;
276 break;
277 case XFER_SW_DMA_0:
278 mask = id[ATA_ID_SWDMA_MODES];
279 if (!(mask & ATA_SWDMA2) && (id[ATA_ID_OLD_DMA_MODES] >> 8)) {
280 u8 mode = id[ATA_ID_OLD_DMA_MODES] >> 8;
281
282 /*
283 * if the mode is valid convert it to the mask
284 * (the maximum allowed mode is XFER_SW_DMA_2)
285 */
286 if (mode <= 2)
287 mask = (2 << mode) - 1;
288 }
289 mask &= hwif->swdma_mask;
290 break;
291 default:
292 BUG();
293 break;
294 }
295
296 return mask;
297}
298
299/**
300 * ide_find_dma_mode - compute DMA speed
301 * @drive: IDE device
302 * @req_mode: requested mode
303 *
304 * Checks the drive/host capabilities and finds the speed to use for
305 * the DMA transfer. The speed is then limited by the requested mode.
306 *
307 * Returns 0 if the drive/host combination is incapable of DMA transfers
308 * or if the requested mode is not a DMA mode.
309 */
310
311u8 ide_find_dma_mode(ide_drive_t *drive, u8 req_mode)
312{
313 ide_hwif_t *hwif = drive->hwif;
314 unsigned int mask;
315 int x, i;
316 u8 mode = 0;
317
318 if (drive->media != ide_disk) {
319 if (hwif->host_flags & IDE_HFLAG_NO_ATAPI_DMA)
320 return 0;
321 }
322
323 for (i = 0; i < ARRAY_SIZE(xfer_mode_bases); i++) {
324 if (req_mode < xfer_mode_bases[i])
325 continue;
326 mask = ide_get_mode_mask(drive, xfer_mode_bases[i], req_mode);
327 x = fls(mask) - 1;
328 if (x >= 0) {
329 mode = xfer_mode_bases[i] + x;
330 break;
331 }
332 }
333
334 if (hwif->chipset == ide_acorn && mode == 0) {
335 /*
336 * is this correct?
337 */
338 if (ide_dma_good_drive(drive) &&
339 drive->id[ATA_ID_EIDE_DMA_TIME] < 150)
340 mode = XFER_MW_DMA_1;
341 }
342
343 mode = min(mode, req_mode);
344
345 printk(KERN_INFO "%s: %s mode selected\n", drive->name,
346 mode ? ide_xfer_verbose(mode) : "no DMA");
347
348 return mode;
349}
350
351static int ide_tune_dma(ide_drive_t *drive)
352{
353 ide_hwif_t *hwif = drive->hwif;
354 u8 speed;
355
356 if (ata_id_has_dma(drive->id) == 0 ||
357 (drive->dev_flags & IDE_DFLAG_NODMA))
358 return 0;
359
360 /* consult the list of known "bad" drives */
361 if (__ide_dma_bad_drive(drive))
362 return 0;
363
364 if (hwif->host_flags & IDE_HFLAG_TRUST_BIOS_FOR_DMA)
365 return config_drive_for_dma(drive);
366
367 speed = ide_max_dma_mode(drive);
368
369 if (!speed)
370 return 0;
371
372 if (ide_set_dma_mode(drive, speed))
373 return 0;
374
375 return 1;
376}
377
378static int ide_dma_check(ide_drive_t *drive)
379{
380 ide_hwif_t *hwif = drive->hwif;
381
382 if (ide_tune_dma(drive))
383 return 0;
384
385 /* TODO: always do PIO fallback */
386 if (hwif->host_flags & IDE_HFLAG_TRUST_BIOS_FOR_DMA)
387 return -1;
388
389 ide_set_max_pio(drive);
390
391 return -1;
392}
393
394int ide_set_dma(ide_drive_t *drive)
395{
396 int rc;
397
398 /*
399 * Force DMAing for the beginning of the check.
400 * Some chipsets appear to do interesting
401 * things, if not checked and cleared.
402 * PARANOIA!!!
403 */
404 ide_dma_off_quietly(drive);
405
406 rc = ide_dma_check(drive);
407 if (rc)
408 return rc;
409
410 ide_dma_on(drive);
411
412 return 0;
413}
414
415void ide_check_dma_crc(ide_drive_t *drive)
416{
417 u8 mode;
418
419 ide_dma_off_quietly(drive);
420 drive->crc_count = 0;
421 mode = drive->current_speed;
422 /*
423 * Don't try non Ultra-DMA modes without iCRC's. Force the
424 * device to PIO and make the user enable SWDMA/MWDMA modes.
425 */
426 if (mode > XFER_UDMA_0 && mode <= XFER_UDMA_7)
427 mode--;
428 else
429 mode = XFER_PIO_4;
430 ide_set_xfer_rate(drive, mode);
431 if (drive->current_speed >= XFER_SW_DMA_0)
432 ide_dma_on(drive);
433}
434
435void ide_dma_lost_irq(ide_drive_t *drive)
436{
437 printk(KERN_ERR "%s: DMA interrupt recovery\n", drive->name);
438}
439EXPORT_SYMBOL_GPL(ide_dma_lost_irq);
440
441/*
442 * un-busy the port etc, and clear any pending DMA status. we want to
443 * retry the current request in pio mode instead of risking tossing it
444 * all away
445 */
446ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error)
447{
448 ide_hwif_t *hwif = drive->hwif;
449 const struct ide_dma_ops *dma_ops = hwif->dma_ops;
450 struct ide_cmd *cmd = &hwif->cmd;
451 ide_startstop_t ret = ide_stopped;
452
453 /*
454 * end current dma transaction
455 */
456
457 if (error < 0) {
458 printk(KERN_WARNING "%s: DMA timeout error\n", drive->name);
459 drive->waiting_for_dma = 0;
460 (void)dma_ops->dma_end(drive);
461 ide_dma_unmap_sg(drive, cmd);
462 ret = ide_error(drive, "dma timeout error",
463 hwif->tp_ops->read_status(hwif));
464 } else {
465 printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name);
466 if (dma_ops->dma_clear)
467 dma_ops->dma_clear(drive);
468 printk(KERN_ERR "%s: timeout waiting for DMA\n", drive->name);
469 if (dma_ops->dma_test_irq(drive) == 0) {
470 ide_dump_status(drive, "DMA timeout",
471 hwif->tp_ops->read_status(hwif));
472 drive->waiting_for_dma = 0;
473 (void)dma_ops->dma_end(drive);
474 ide_dma_unmap_sg(drive, cmd);
475 }
476 }
477
478 /*
479 * disable dma for now, but remember that we did so because of
480 * a timeout -- we'll reenable after we finish this next request
481 * (or rather the first chunk of it) in pio.
482 */
483 drive->dev_flags |= IDE_DFLAG_DMA_PIO_RETRY;
484 drive->retry_pio++;
485 ide_dma_off_quietly(drive);
486
487 /*
488 * make sure request is sane
489 */
490 if (hwif->rq)
491 scsi_req(hwif->rq)->result = 0;
492 return ret;
493}
494
495void ide_release_dma_engine(ide_hwif_t *hwif)
496{
497 if (hwif->dmatable_cpu) {
498 int prd_size = hwif->prd_max_nents * hwif->prd_ent_size;
499
500 dma_free_coherent(hwif->dev, prd_size,
501 hwif->dmatable_cpu, hwif->dmatable_dma);
502 hwif->dmatable_cpu = NULL;
503 }
504}
505EXPORT_SYMBOL_GPL(ide_release_dma_engine);
506
507int ide_allocate_dma_engine(ide_hwif_t *hwif)
508{
509 int prd_size;
510
511 if (hwif->prd_max_nents == 0)
512 hwif->prd_max_nents = PRD_ENTRIES;
513 if (hwif->prd_ent_size == 0)
514 hwif->prd_ent_size = PRD_BYTES;
515
516 prd_size = hwif->prd_max_nents * hwif->prd_ent_size;
517
518 hwif->dmatable_cpu = dma_alloc_coherent(hwif->dev, prd_size,
519 &hwif->dmatable_dma,
520 GFP_ATOMIC);
521 if (hwif->dmatable_cpu == NULL) {
522 printk(KERN_ERR "%s: unable to allocate PRD table\n",
523 hwif->name);
524 return -ENOMEM;
525 }
526
527 return 0;
528}
529EXPORT_SYMBOL_GPL(ide_allocate_dma_engine);
530
531int ide_dma_prepare(ide_drive_t *drive, struct ide_cmd *cmd)
532{
533 const struct ide_dma_ops *dma_ops = drive->hwif->dma_ops;
534
535 if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0 ||
536 (dma_ops->dma_check && dma_ops->dma_check(drive, cmd)))
537 goto out;
538 ide_map_sg(drive, cmd);
539 if (ide_dma_map_sg(drive, cmd) == 0)
540 goto out_map;
541 if (dma_ops->dma_setup(drive, cmd))
542 goto out_dma_unmap;
543 drive->waiting_for_dma = 1;
544 return 0;
545out_dma_unmap:
546 ide_dma_unmap_sg(drive, cmd);
547out_map:
548 ide_map_sg(drive, cmd);
549out:
550 return 1;
551}