2 * IDE DMA support (including IDE PCI BM-DMA).
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
8 * May be copied or modified under the terms of the GNU General Public License
10 * DMA is supported for all IDE devices (disk drives, cdroms, tapes, floppies).
14 * Special Thanks to Mark for his Six years of work.
18 * Thanks to "Christopher J. Reimer" <reimer@doe.carleton.ca> for
19 * fixing the problem with the BIOS on some Acer motherboards.
21 * Thanks to "Benoit Poulot-Cazajous" <poulot@chorus.fr> for testing
22 * "TX" chipset compatibility and for providing patches for the "TX" chipset.
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.
27 * Most importantly, thanks to Robert Bringman <rob@mars.trion.com>
28 * for supplying a Promise UDMA board & WD UDMA drive for this work!
31 #include <linux/types.h>
32 #include <linux/kernel.h>
33 #include <linux/ide.h>
34 #include <linux/scatterlist.h>
35 #include <linux/dma-mapping.h>
37 static const struct drive_list_entry drive_whitelist[] = {
38 { "Micropolis 2112A" , NULL },
39 { "CONNER CTMA 4000" , NULL },
40 { "CONNER CTT8000-A" , NULL },
41 { "ST34342A" , NULL },
45 static const struct drive_list_entry drive_blacklist[] = {
46 { "WDC AC11000H" , NULL },
47 { "WDC AC22100H" , NULL },
48 { "WDC AC32500H" , NULL },
49 { "WDC AC33100H" , NULL },
50 { "WDC AC31600H" , NULL },
51 { "WDC AC32100H" , "24.09P07" },
52 { "WDC AC23200L" , "21.10N21" },
53 { "Compaq CRD-8241B" , NULL },
54 { "CRD-8400B" , NULL },
55 { "CRD-8480B", NULL },
56 { "CRD-8482B", 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 },
74 { "SAMSUNG CD-ROM SN-124", "N001" },
75 { "Seagate STT20000A", NULL },
76 { "CD-ROM CDR_U200", "1.09" },
82 * ide_dma_intr - IDE DMA interrupt handler
83 * @drive: the drive the interrupt is for
85 * Handle an interrupt completing a read/write DMA transfer on an
89 ide_startstop_t ide_dma_intr(ide_drive_t *drive)
91 ide_hwif_t *hwif = drive->hwif;
92 u8 stat = 0, dma_stat = 0;
94 dma_stat = hwif->dma_ops->dma_end(drive);
95 stat = hwif->tp_ops->read_status(hwif);
97 if (OK_STAT(stat, DRIVE_READY, drive->bad_wstat | ATA_DRQ)) {
99 struct ide_cmd *cmd = &hwif->cmd;
101 ide_finish_cmd(drive, cmd, stat);
104 printk(KERN_ERR "%s: %s: bad DMA status (0x%02x)\n",
105 drive->name, __func__, dma_stat);
107 return ide_error(drive, "dma_intr", stat);
109 EXPORT_SYMBOL_GPL(ide_dma_intr);
111 int ide_dma_good_drive(ide_drive_t *drive)
113 return ide_in_drive_list(drive->id, drive_whitelist);
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
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
123 * kernel provide the necessary cache management so that we can
124 * operate in a portable fashion.
127 int ide_build_sglist(ide_drive_t *drive, struct request *rq)
129 ide_hwif_t *hwif = drive->hwif;
130 struct scatterlist *sg = hwif->sg_table;
131 struct ide_cmd *cmd = &hwif->cmd;
134 ide_map_sg(drive, rq);
136 if (rq_data_dir(rq) == READ)
137 cmd->sg_dma_direction = DMA_FROM_DEVICE;
139 cmd->sg_dma_direction = DMA_TO_DEVICE;
141 i = dma_map_sg(hwif->dev, sg, cmd->sg_nents, cmd->sg_dma_direction);
143 ide_map_sg(drive, rq);
145 cmd->orig_sg_nents = cmd->sg_nents;
153 * ide_destroy_dmatable - clean up DMA mapping
154 * @drive: The drive to unmap
156 * Teardown mappings after DMA has completed. This must be called
157 * after the completion of each use of ide_build_dmatable and before
158 * the next use of ide_build_dmatable. Failure to do so will cause
159 * an oops as only one mapping can be live for each target at a given
163 void ide_destroy_dmatable(ide_drive_t *drive)
165 ide_hwif_t *hwif = drive->hwif;
166 struct ide_cmd *cmd = &hwif->cmd;
168 dma_unmap_sg(hwif->dev, hwif->sg_table, cmd->orig_sg_nents,
169 cmd->sg_dma_direction);
171 EXPORT_SYMBOL_GPL(ide_destroy_dmatable);
174 * ide_dma_off_quietly - Generic DMA kill
175 * @drive: drive to control
177 * Turn off the current DMA on this IDE controller.
180 void ide_dma_off_quietly(ide_drive_t *drive)
182 drive->dev_flags &= ~IDE_DFLAG_USING_DMA;
183 ide_toggle_bounce(drive, 0);
185 drive->hwif->dma_ops->dma_host_set(drive, 0);
187 EXPORT_SYMBOL(ide_dma_off_quietly);
190 * ide_dma_off - disable DMA on a device
191 * @drive: drive to disable DMA on
193 * Disable IDE DMA for a device on this IDE controller.
194 * Inform the user that DMA has been disabled.
197 void ide_dma_off(ide_drive_t *drive)
199 printk(KERN_INFO "%s: DMA disabled\n", drive->name);
200 ide_dma_off_quietly(drive);
202 EXPORT_SYMBOL(ide_dma_off);
205 * ide_dma_on - Enable DMA on a device
206 * @drive: drive to enable DMA on
208 * Enable IDE DMA for a device on this IDE controller.
211 void ide_dma_on(ide_drive_t *drive)
213 drive->dev_flags |= IDE_DFLAG_USING_DMA;
214 ide_toggle_bounce(drive, 1);
216 drive->hwif->dma_ops->dma_host_set(drive, 1);
219 int __ide_dma_bad_drive(ide_drive_t *drive)
223 int blacklist = ide_in_drive_list(id, drive_blacklist);
225 printk(KERN_WARNING "%s: Disabling (U)DMA for %s (blacklisted)\n",
226 drive->name, (char *)&id[ATA_ID_PROD]);
231 EXPORT_SYMBOL(__ide_dma_bad_drive);
233 static const u8 xfer_mode_bases[] = {
239 static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base, u8 req_mode)
242 ide_hwif_t *hwif = drive->hwif;
243 const struct ide_port_ops *port_ops = hwif->port_ops;
244 unsigned int mask = 0;
248 if ((id[ATA_ID_FIELD_VALID] & 4) == 0)
251 if (port_ops && port_ops->udma_filter)
252 mask = port_ops->udma_filter(drive);
254 mask = hwif->ultra_mask;
255 mask &= id[ATA_ID_UDMA_MODES];
258 * avoid false cable warning from eighty_ninty_three()
260 if (req_mode > XFER_UDMA_2) {
261 if ((mask & 0x78) && (eighty_ninty_three(drive) == 0))
266 if ((id[ATA_ID_FIELD_VALID] & 2) == 0)
268 if (port_ops && port_ops->mdma_filter)
269 mask = port_ops->mdma_filter(drive);
271 mask = hwif->mwdma_mask;
272 mask &= id[ATA_ID_MWDMA_MODES];
275 if (id[ATA_ID_FIELD_VALID] & 2) {
276 mask = id[ATA_ID_SWDMA_MODES] & hwif->swdma_mask;
277 } else if (id[ATA_ID_OLD_DMA_MODES] >> 8) {
278 u8 mode = id[ATA_ID_OLD_DMA_MODES] >> 8;
281 * if the mode is valid convert it to the mask
282 * (the maximum allowed mode is XFER_SW_DMA_2)
285 mask = ((2 << mode) - 1) & hwif->swdma_mask;
297 * ide_find_dma_mode - compute DMA speed
299 * @req_mode: requested mode
301 * Checks the drive/host capabilities and finds the speed to use for
302 * the DMA transfer. The speed is then limited by the requested mode.
304 * Returns 0 if the drive/host combination is incapable of DMA transfers
305 * or if the requested mode is not a DMA mode.
308 u8 ide_find_dma_mode(ide_drive_t *drive, u8 req_mode)
310 ide_hwif_t *hwif = drive->hwif;
315 if (drive->media != ide_disk) {
316 if (hwif->host_flags & IDE_HFLAG_NO_ATAPI_DMA)
320 for (i = 0; i < ARRAY_SIZE(xfer_mode_bases); i++) {
321 if (req_mode < xfer_mode_bases[i])
323 mask = ide_get_mode_mask(drive, xfer_mode_bases[i], req_mode);
326 mode = xfer_mode_bases[i] + x;
331 if (hwif->chipset == ide_acorn && mode == 0) {
335 if (ide_dma_good_drive(drive) &&
336 drive->id[ATA_ID_EIDE_DMA_TIME] < 150)
337 mode = XFER_MW_DMA_1;
340 mode = min(mode, req_mode);
342 printk(KERN_INFO "%s: %s mode selected\n", drive->name,
343 mode ? ide_xfer_verbose(mode) : "no DMA");
347 EXPORT_SYMBOL_GPL(ide_find_dma_mode);
349 static int ide_tune_dma(ide_drive_t *drive)
351 ide_hwif_t *hwif = drive->hwif;
354 if (ata_id_has_dma(drive->id) == 0 ||
355 (drive->dev_flags & IDE_DFLAG_NODMA))
358 /* consult the list of known "bad" drives */
359 if (__ide_dma_bad_drive(drive))
362 if (ide_id_dma_bug(drive))
365 if (hwif->host_flags & IDE_HFLAG_TRUST_BIOS_FOR_DMA)
366 return config_drive_for_dma(drive);
368 speed = ide_max_dma_mode(drive);
373 if (ide_set_dma_mode(drive, speed))
379 static int ide_dma_check(ide_drive_t *drive)
381 ide_hwif_t *hwif = drive->hwif;
383 if (ide_tune_dma(drive))
386 /* TODO: always do PIO fallback */
387 if (hwif->host_flags & IDE_HFLAG_TRUST_BIOS_FOR_DMA)
390 ide_set_max_pio(drive);
395 int ide_id_dma_bug(ide_drive_t *drive)
399 if (id[ATA_ID_FIELD_VALID] & 4) {
400 if ((id[ATA_ID_UDMA_MODES] >> 8) &&
401 (id[ATA_ID_MWDMA_MODES] >> 8))
403 } else if (id[ATA_ID_FIELD_VALID] & 2) {
404 if ((id[ATA_ID_MWDMA_MODES] >> 8) &&
405 (id[ATA_ID_SWDMA_MODES] >> 8))
410 printk(KERN_ERR "%s: bad DMA info in identify block\n", drive->name);
414 int ide_set_dma(ide_drive_t *drive)
419 * Force DMAing for the beginning of the check.
420 * Some chipsets appear to do interesting
421 * things, if not checked and cleared.
424 ide_dma_off_quietly(drive);
426 rc = ide_dma_check(drive);
435 void ide_check_dma_crc(ide_drive_t *drive)
439 ide_dma_off_quietly(drive);
440 drive->crc_count = 0;
441 mode = drive->current_speed;
443 * Don't try non Ultra-DMA modes without iCRC's. Force the
444 * device to PIO and make the user enable SWDMA/MWDMA modes.
446 if (mode > XFER_UDMA_0 && mode <= XFER_UDMA_7)
450 ide_set_xfer_rate(drive, mode);
451 if (drive->current_speed >= XFER_SW_DMA_0)
455 void ide_dma_lost_irq(ide_drive_t *drive)
457 printk(KERN_ERR "%s: DMA interrupt recovery\n", drive->name);
459 EXPORT_SYMBOL_GPL(ide_dma_lost_irq);
461 void ide_dma_timeout(ide_drive_t *drive)
463 ide_hwif_t *hwif = drive->hwif;
465 printk(KERN_ERR "%s: timeout waiting for DMA\n", drive->name);
467 if (hwif->dma_ops->dma_test_irq(drive))
470 ide_dump_status(drive, "DMA timeout", hwif->tp_ops->read_status(hwif));
472 hwif->dma_ops->dma_end(drive);
474 EXPORT_SYMBOL_GPL(ide_dma_timeout);
477 * un-busy the port etc, and clear any pending DMA status. we want to
478 * retry the current request in pio mode instead of risking tossing it
481 ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error)
483 ide_hwif_t *hwif = drive->hwif;
485 ide_startstop_t ret = ide_stopped;
488 * end current dma transaction
492 printk(KERN_WARNING "%s: DMA timeout error\n", drive->name);
493 (void)hwif->dma_ops->dma_end(drive);
494 ret = ide_error(drive, "dma timeout error",
495 hwif->tp_ops->read_status(hwif));
497 printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name);
498 hwif->dma_ops->dma_timeout(drive);
502 * disable dma for now, but remember that we did so because of
503 * a timeout -- we'll reenable after we finish this next request
504 * (or rather the first chunk of it) in pio.
506 drive->dev_flags |= IDE_DFLAG_DMA_PIO_RETRY;
508 ide_dma_off_quietly(drive);
511 * un-busy drive etc and make sure request is sane
525 rq->sector = rq->bio->bi_sector;
526 rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9;
527 rq->hard_cur_sectors = rq->current_nr_sectors;
528 rq->buffer = bio_data(rq->bio);
533 void ide_release_dma_engine(ide_hwif_t *hwif)
535 if (hwif->dmatable_cpu) {
536 int prd_size = hwif->prd_max_nents * hwif->prd_ent_size;
538 dma_free_coherent(hwif->dev, prd_size,
539 hwif->dmatable_cpu, hwif->dmatable_dma);
540 hwif->dmatable_cpu = NULL;
543 EXPORT_SYMBOL_GPL(ide_release_dma_engine);
545 int ide_allocate_dma_engine(ide_hwif_t *hwif)
549 if (hwif->prd_max_nents == 0)
550 hwif->prd_max_nents = PRD_ENTRIES;
551 if (hwif->prd_ent_size == 0)
552 hwif->prd_ent_size = PRD_BYTES;
554 prd_size = hwif->prd_max_nents * hwif->prd_ent_size;
556 hwif->dmatable_cpu = dma_alloc_coherent(hwif->dev, prd_size,
559 if (hwif->dmatable_cpu == NULL) {
560 printk(KERN_ERR "%s: unable to allocate PRD table\n",
567 EXPORT_SYMBOL_GPL(ide_allocate_dma_engine);