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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Bartlomiej Zolnierkiewicz204f47c2008-02-26 21:50:36 +01002 * IDE DMA support (including IDE PCI BM-DMA).
3 *
Bartlomiej Zolnierkiewicz59bca8c2008-02-01 23:09:33 +01004 * Copyright (C) 1995-1998 Mark Lord
5 * Copyright (C) 1999-2000 Andre Hedrick <andre@linux-ide.org>
6 * Copyright (C) 2004, 2007 Bartlomiej Zolnierkiewicz
Bartlomiej Zolnierkiewicz58f189f2008-02-01 23:09:33 +01007 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * May be copied or modified under the terms of the GNU General Public License
Bartlomiej Zolnierkiewicz204f47c2008-02-26 21:50:36 +01009 *
10 * DMA is supported for all IDE devices (disk drives, cdroms, tapes, floppies).
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 */
12
13/*
14 * Special Thanks to Mark for his Six years of work.
Linus Torvalds1da177e2005-04-16 15:20:36 -070015 */
16
17/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 * 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!
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 */
30
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/types.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090032#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/kernel.h>
Paul Gortmaker38789fd2011-07-17 15:33:58 -040034#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/ide.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/scatterlist.h>
Bartlomiej Zolnierkiewicz5c05ff62008-02-01 23:09:32 +010037#include <linux/dma-mapping.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +020039static const struct drive_list_entry drive_whitelist[] = {
Junio C Hamanoc2d3ce82007-07-09 23:17:56 +020040 { "Micropolis 2112A" , NULL },
41 { "CONNER CTMA 4000" , NULL },
42 { "CONNER CTT8000-A" , NULL },
43 { "ST34342A" , NULL },
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 { NULL , NULL }
45};
46
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +020047static const struct drive_list_entry drive_blacklist[] = {
Junio C Hamanoc2d3ce82007-07-09 23:17:56 +020048 { "WDC AC11000H" , NULL },
49 { "WDC AC22100H" , NULL },
50 { "WDC AC32500H" , NULL },
51 { "WDC AC33100H" , NULL },
52 { "WDC AC31600H" , NULL },
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 { "WDC AC32100H" , "24.09P07" },
54 { "WDC AC23200L" , "21.10N21" },
Junio C Hamanoc2d3ce82007-07-09 23:17:56 +020055 { "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 },
Junio C Hamano5a6248c2007-05-24 02:42:38 +020076 { "SAMSUNG CD-ROM SN-124", "N001" },
Junio C Hamanoc2d3ce82007-07-09 23:17:56 +020077 { "Seagate STT20000A", NULL },
Bartlomiej Zolnierkiewiczb0bc65b2007-11-27 21:35:56 +010078 { "CD-ROM CDR_U200", "1.09" },
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 { NULL , NULL }
80
81};
82
83/**
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 * ide_dma_intr - IDE DMA interrupt handler
85 * @drive: the drive the interrupt is for
86 *
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +020087 * Handle an interrupt completing a read/write DMA transfer on an
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 * IDE device
89 */
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +020090
91ide_startstop_t ide_dma_intr(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -070092{
Bartlomiej Zolnierkiewiczb73c7ee2008-07-23 19:55:52 +020093 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewiczf094d4d2009-03-31 20:15:24 +020094 struct ide_cmd *cmd = &hwif->cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 u8 stat = 0, dma_stat = 0;
96
Bartlomiej Zolnierkiewicz88b41322009-03-31 20:15:22 +020097 drive->waiting_for_dma = 0;
Bartlomiej Zolnierkiewiczb73c7ee2008-07-23 19:55:52 +020098 dma_stat = hwif->dma_ops->dma_end(drive);
Bartlomiej Zolnierkiewiczf094d4d2009-03-31 20:15:24 +020099 ide_dma_unmap_sg(drive, cmd);
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200100 stat = hwif->tp_ops->read_status(hwif);
Bartlomiej Zolnierkiewiczc47137a2008-02-06 02:57:51 +0100101
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200102 if (OK_STAT(stat, DRIVE_READY, drive->bad_wstat | ATA_DRQ)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 if (!dma_stat) {
Bartlomiej Zolnierkiewicz2230d90d2009-03-27 12:46:42 +0100104 if ((cmd->tf_flags & IDE_TFLAG_FS) == 0)
105 ide_finish_cmd(drive, cmd, stat);
106 else
Bartlomiej Zolnierkiewicz130e8862009-03-27 12:46:45 +0100107 ide_complete_rq(drive, 0,
Tejun Heo9780e2d2009-05-07 22:24:40 +0900108 blk_rq_sectors(cmd->rq) << 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 return ide_stopped;
110 }
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +0200111 printk(KERN_ERR "%s: %s: bad DMA status (0x%02x)\n",
112 drive->name, __func__, dma_stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 }
114 return ide_error(drive, "dma_intr", stat);
115}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Bartlomiej Zolnierkiewicz2dbe7e92008-10-13 21:39:47 +0200117int ide_dma_good_drive(ide_drive_t *drive)
Bartlomiej Zolnierkiewicz75d7d962007-10-13 17:47:50 +0200118{
119 return ide_in_drive_list(drive->id, drive_whitelist);
120}
121
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122/**
Bartlomiej Zolnierkiewiczf094d4d2009-03-31 20:15:24 +0200123 * ide_dma_map_sg - map IDE scatter gather for DMA I/O
124 * @drive: the drive to map the DMA table for
Bartlomiej Zolnierkiewicz229816942009-03-27 12:46:46 +0100125 * @cmd: command
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 *
Bartlomiej Zolnierkiewicz5c05ff62008-02-01 23:09:32 +0100127 * Perform the DMA mapping magic necessary to access the source or
128 * target buffers of a request via DMA. The lower layers of the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 * kernel provide the necessary cache management so that we can
Bartlomiej Zolnierkiewicz5c05ff62008-02-01 23:09:32 +0100130 * operate in a portable fashion.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 */
132
Bartlomiej Zolnierkiewiczf094d4d2009-03-31 20:15:24 +0200133static int ide_dma_map_sg(ide_drive_t *drive, struct ide_cmd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134{
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +0200135 ide_hwif_t *hwif = drive->hwif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 struct scatterlist *sg = hwif->sg_table;
FUJITA Tomonori5d827202009-03-13 21:16:13 +0100137 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Bartlomiej Zolnierkiewicz229816942009-03-27 12:46:46 +0100139 if (cmd->tf_flags & IDE_TFLAG_WRITE)
Bartlomiej Zolnierkiewiczb6308ee2009-03-27 12:46:38 +0100140 cmd->sg_dma_direction = DMA_TO_DEVICE;
Bartlomiej Zolnierkiewicz229816942009-03-27 12:46:46 +0100141 else
142 cmd->sg_dma_direction = DMA_FROM_DEVICE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Bartlomiej Zolnierkiewiczb6308ee2009-03-27 12:46:38 +0100144 i = dma_map_sg(hwif->dev, sg, cmd->sg_nents, cmd->sg_dma_direction);
Bartlomiej Zolnierkiewiczf094d4d2009-03-31 20:15:24 +0200145 if (i) {
Bartlomiej Zolnierkiewiczb6308ee2009-03-27 12:46:38 +0100146 cmd->orig_sg_nents = cmd->sg_nents;
147 cmd->sg_nents = i;
FUJITA Tomonori5d827202009-03-13 21:16:13 +0100148 }
149
150 return i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153/**
Bartlomiej Zolnierkiewiczf094d4d2009-03-31 20:15:24 +0200154 * ide_dma_unmap_sg - clean up DMA mapping
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 * @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 */
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +0200163
Bartlomiej Zolnierkiewiczf094d4d2009-03-31 20:15:24 +0200164void ide_dma_unmap_sg(ide_drive_t *drive, struct ide_cmd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165{
Bartlomiej Zolnierkiewicz36501652008-02-01 23:09:31 +0100166 ide_hwif_t *hwif = drive->hwif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
Bartlomiej Zolnierkiewiczb6308ee2009-03-27 12:46:38 +0100168 dma_unmap_sg(hwif->dev, hwif->sg_table, cmd->orig_sg_nents,
169 cmd->sg_dma_direction);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170}
Bartlomiej Zolnierkiewiczf094d4d2009-03-31 20:15:24 +0200171EXPORT_SYMBOL_GPL(ide_dma_unmap_sg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173/**
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100174 * ide_dma_off_quietly - Generic DMA kill
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 * @drive: drive to control
176 *
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +0200177 * Turn off the current DMA on this IDE controller.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 */
179
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100180void ide_dma_off_quietly(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181{
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200182 drive->dev_flags &= ~IDE_DFLAG_USING_DMA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 ide_toggle_bounce(drive, 0);
184
Bartlomiej Zolnierkiewicz5e37bdc2008-04-26 22:25:24 +0200185 drive->hwif->dma_ops->dma_host_set(drive, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186}
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100187EXPORT_SYMBOL(ide_dma_off_quietly);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
189/**
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100190 * ide_dma_off - disable DMA on a device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 * @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
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100197void ide_dma_off(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198{
199 printk(KERN_INFO "%s: DMA disabled\n", drive->name);
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +0100200 ide_dma_off_quietly(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201}
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100202EXPORT_SYMBOL(ide_dma_off);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204/**
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +0100205 * ide_dma_on - Enable DMA on a device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 * @drive: drive to enable DMA on
207 *
208 * Enable IDE DMA for a device on this IDE controller.
209 */
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +0100210
211void ide_dma_on(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212{
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200213 drive->dev_flags |= IDE_DFLAG_USING_DMA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 ide_toggle_bounce(drive, 1);
215
Bartlomiej Zolnierkiewicz5e37bdc2008-04-26 22:25:24 +0200216 drive->hwif->dma_ops->dma_host_set(drive, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217}
218
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +0200219int __ide_dma_bad_drive(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220{
Bartlomiej Zolnierkiewicz4dde4492008-10-10 22:39:19 +0200221 u16 *id = drive->id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
Jordan Crouse65e5f2e2005-12-15 02:16:18 +0100223 int blacklist = ide_in_drive_list(id, drive_blacklist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 if (blacklist) {
225 printk(KERN_WARNING "%s: Disabling (U)DMA for %s (blacklisted)\n",
Bartlomiej Zolnierkiewicz4dde4492008-10-10 22:39:19 +0200226 drive->name, (char *)&id[ATA_ID_PROD]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 return blacklist;
228 }
229 return 0;
230}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231EXPORT_SYMBOL(__ide_dma_bad_drive);
232
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200233static const u8 xfer_mode_bases[] = {
234 XFER_UDMA_0,
235 XFER_MW_DMA_0,
236 XFER_SW_DMA_0,
237};
238
Bartlomiej Zolnierkiewicz7670df72007-10-11 23:53:59 +0200239static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base, u8 req_mode)
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200240{
Bartlomiej Zolnierkiewicz4dde4492008-10-10 22:39:19 +0200241 u16 *id = drive->id;
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200242 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewiczac95bee2008-04-26 22:25:14 +0200243 const struct ide_port_ops *port_ops = hwif->port_ops;
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200244 unsigned int mask = 0;
245
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +0200246 switch (base) {
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200247 case XFER_UDMA_0:
Bartlomiej Zolnierkiewicz4dde4492008-10-10 22:39:19 +0200248 if ((id[ATA_ID_FIELD_VALID] & 4) == 0)
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200249 break;
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200250 mask = id[ATA_ID_UDMA_MODES];
Bartlomiej Zolnierkiewiczac95bee2008-04-26 22:25:14 +0200251 if (port_ops && port_ops->udma_filter)
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200252 mask &= port_ops->udma_filter(drive);
Sergei Shtylyov851dd332007-10-11 23:53:59 +0200253 else
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200254 mask &= hwif->ultra_mask;
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200255
Bartlomiej Zolnierkiewicz7670df72007-10-11 23:53:59 +0200256 /*
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 }
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200263 break;
264 case XFER_MW_DMA_0:
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200265 mask = id[ATA_ID_MWDMA_MODES];
Sergei Shtylyov74638c82009-03-31 20:15:28 +0200266
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
Bartlomiej Zolnierkiewiczac95bee2008-04-26 22:25:14 +0200274 if (port_ops && port_ops->mdma_filter)
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200275 mask &= port_ops->mdma_filter(drive);
Sergei Shtylyovb4e44362007-10-11 23:53:58 +0200276 else
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200277 mask &= hwif->mwdma_mask;
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200278 break;
279 case XFER_SW_DMA_0:
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200280 mask = id[ATA_ID_SWDMA_MODES];
281 if (!(mask & ATA_SWDMA2) && (id[ATA_ID_OLD_DMA_MODES] >> 8)) {
Bartlomiej Zolnierkiewicz48fb2682008-10-10 22:39:19 +0200282 u8 mode = id[ATA_ID_OLD_DMA_MODES] >> 8;
Bartlomiej Zolnierkiewicz15a4f942007-07-09 23:17:57 +0200283
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)
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200289 mask = (2 << mode) - 1;
Bartlomiej Zolnierkiewicz15a4f942007-07-09 23:17:57 +0200290 }
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200291 mask &= hwif->swdma_mask;
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200292 break;
293 default:
294 BUG();
295 break;
296 }
297
298 return mask;
299}
300
301/**
Bartlomiej Zolnierkiewicz7670df72007-10-11 23:53:59 +0200302 * ide_find_dma_mode - compute DMA speed
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200303 * @drive: IDE device
Bartlomiej Zolnierkiewicz7670df72007-10-11 23:53:59 +0200304 * @req_mode: requested mode
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200305 *
Bartlomiej Zolnierkiewicz7670df72007-10-11 23:53:59 +0200306 * 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.
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200311 */
312
Bartlomiej Zolnierkiewicz7670df72007-10-11 23:53:59 +0200313u8 ide_find_dma_mode(ide_drive_t *drive, u8 req_mode)
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200314{
315 ide_hwif_t *hwif = drive->hwif;
316 unsigned int mask;
317 int x, i;
318 u8 mode = 0;
319
Bartlomiej Zolnierkiewicz33c10022007-10-19 00:30:06 +0200320 if (drive->media != ide_disk) {
321 if (hwif->host_flags & IDE_HFLAG_NO_ATAPI_DMA)
322 return 0;
323 }
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200324
325 for (i = 0; i < ARRAY_SIZE(xfer_mode_bases); i++) {
Bartlomiej Zolnierkiewicz7670df72007-10-11 23:53:59 +0200326 if (req_mode < xfer_mode_bases[i])
327 continue;
328 mask = ide_get_mode_mask(drive, xfer_mode_bases[i], req_mode);
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200329 x = fls(mask) - 1;
330 if (x >= 0) {
331 mode = xfer_mode_bases[i] + x;
332 break;
333 }
334 }
335
Bartlomiej Zolnierkiewicz75d7d962007-10-13 17:47:50 +0200336 if (hwif->chipset == ide_acorn && mode == 0) {
337 /*
338 * is this correct?
339 */
Bartlomiej Zolnierkiewicz4dde4492008-10-10 22:39:19 +0200340 if (ide_dma_good_drive(drive) &&
341 drive->id[ATA_ID_EIDE_DMA_TIME] < 150)
Bartlomiej Zolnierkiewicz75d7d962007-10-13 17:47:50 +0200342 mode = XFER_MW_DMA_1;
343 }
344
Bartlomiej Zolnierkiewicz3ab7efe2007-12-12 23:31:58 +0100345 mode = min(mode, req_mode);
346
347 printk(KERN_INFO "%s: %s mode selected\n", drive->name,
Bartlomiej Zolnierkiewiczd34887d2007-11-05 21:42:27 +0100348 mode ? ide_xfer_verbose(mode) : "no DMA");
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200349
Bartlomiej Zolnierkiewicz3ab7efe2007-12-12 23:31:58 +0100350 return mode;
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200351}
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200352
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200353static int ide_tune_dma(ide_drive_t *drive)
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200354{
Bartlomiej Zolnierkiewicz8704de82008-01-26 20:13:00 +0100355 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200356 u8 speed;
357
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200358 if (ata_id_has_dma(drive->id) == 0 ||
359 (drive->dev_flags & IDE_DFLAG_NODMA))
Bartlomiej Zolnierkiewicz122ab082007-05-16 00:51:46 +0200360 return 0;
361
362 /* consult the list of known "bad" drives */
363 if (__ide_dma_bad_drive(drive))
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200364 return 0;
365
Bartlomiej Zolnierkiewicz8704de82008-01-26 20:13:00 +0100366 if (hwif->host_flags & IDE_HFLAG_TRUST_BIOS_FOR_DMA)
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200367 return config_drive_for_dma(drive);
368
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200369 speed = ide_max_dma_mode(drive);
370
Bartlomiej Zolnierkiewicz951784b2008-04-26 17:36:38 +0200371 if (!speed)
372 return 0;
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200373
Bartlomiej Zolnierkiewicz88b2b322007-10-13 17:47:51 +0200374 if (ide_set_dma_mode(drive, speed))
Bartlomiej Zolnierkiewicz4728d542007-05-16 00:51:46 +0200375 return 0;
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200376
Bartlomiej Zolnierkiewicz4728d542007-05-16 00:51:46 +0200377 return 1;
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200378}
379
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200380static int ide_dma_check(ide_drive_t *drive)
381{
382 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200383
Bartlomiej Zolnierkiewiczba4b2e62008-07-23 19:55:55 +0200384 if (ide_tune_dma(drive))
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200385 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
Bartlomiej Zolnierkiewiczba4b2e62008-07-23 19:55:55 +0200393 return -1;
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200394}
395
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100396int ide_set_dma(ide_drive_t *drive)
397{
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100398 int rc;
399
Bartlomiej Zolnierkiewicz7b905992008-01-25 22:17:19 +0100400 /*
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 */
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +0100406 ide_dma_off_quietly(drive);
Bartlomiej Zolnierkiewicz7b905992008-01-25 22:17:19 +0100407
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200408 rc = ide_dma_check(drive);
Bartlomiej Zolnierkiewicz7b905992008-01-25 22:17:19 +0100409 if (rc)
410 return rc;
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100411
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +0100412 ide_dma_on(drive);
413
414 return 0;
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100415}
416
Bartlomiej Zolnierkiewicz578cfa02008-02-02 19:56:47 +0100417void 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
Bartlomiej Zolnierkiewiczde23ec92008-10-13 21:39:46 +0200437void ide_dma_lost_irq(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438{
Bartlomiej Zolnierkiewiczde23ec92008-10-13 21:39:46 +0200439 printk(KERN_ERR "%s: DMA interrupt recovery\n", drive->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440}
Bartlomiej Zolnierkiewiczde23ec92008-10-13 21:39:46 +0200441EXPORT_SYMBOL_GPL(ide_dma_lost_irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
Bartlomiej Zolnierkiewicz65ca5372009-03-24 23:22:43 +0100443/*
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 */
448ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error)
449{
450 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewicz35c9b4d2009-03-31 20:15:19 +0200451 const struct ide_dma_ops *dma_ops = hwif->dma_ops;
Bartlomiej Zolnierkiewiczf094d4d2009-03-31 20:15:24 +0200452 struct ide_cmd *cmd = &hwif->cmd;
Bartlomiej Zolnierkiewicz65ca5372009-03-24 23:22:43 +0100453 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);
Bartlomiej Zolnierkiewicz88b41322009-03-31 20:15:22 +0200461 drive->waiting_for_dma = 0;
Bartlomiej Zolnierkiewicz35c9b4d2009-03-31 20:15:19 +0200462 (void)dma_ops->dma_end(drive);
Bartlomiej Zolnierkiewiczf094d4d2009-03-31 20:15:24 +0200463 ide_dma_unmap_sg(drive, cmd);
Bartlomiej Zolnierkiewicz65ca5372009-03-24 23:22:43 +0100464 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);
Bartlomiej Zolnierkiewicz35c9b4d2009-03-31 20:15:19 +0200468 if (dma_ops->dma_clear)
469 dma_ops->dma_clear(drive);
Bartlomiej Zolnierkiewicz1cee52d2009-03-31 20:15:19 +0200470 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));
Bartlomiej Zolnierkiewicz88b41322009-03-31 20:15:22 +0200474 drive->waiting_for_dma = 0;
Bartlomiej Zolnierkiewicz1cee52d2009-03-31 20:15:19 +0200475 (void)dma_ops->dma_end(drive);
Bartlomiej Zolnierkiewiczf094d4d2009-03-31 20:15:24 +0200476 ide_dma_unmap_sg(drive, cmd);
Bartlomiej Zolnierkiewicz1cee52d2009-03-31 20:15:19 +0200477 }
Bartlomiej Zolnierkiewicz65ca5372009-03-24 23:22:43 +0100478 }
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 /*
Tejun Heodd8717d2010-04-08 01:45:46 -0700490 * make sure request is sane
Bartlomiej Zolnierkiewicz65ca5372009-03-24 23:22:43 +0100491 */
Tejun Heodd8717d2010-04-08 01:45:46 -0700492 if (hwif->rq)
493 hwif->rq->errors = 0;
Bartlomiej Zolnierkiewicz65ca5372009-03-24 23:22:43 +0100494 return ret;
495}
496
Bartlomiej Zolnierkiewicz0d1bad22008-04-26 22:25:19 +0200497void ide_release_dma_engine(ide_hwif_t *hwif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498{
499 if (hwif->dmatable_cpu) {
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200500 int prd_size = hwif->prd_max_nents * hwif->prd_ent_size;
Bartlomiej Zolnierkiewicz36501652008-02-01 23:09:31 +0100501
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200502 dma_free_coherent(hwif->dev, prd_size,
503 hwif->dmatable_cpu, hwif->dmatable_dma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 hwif->dmatable_cpu = NULL;
505 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506}
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200507EXPORT_SYMBOL_GPL(ide_release_dma_engine);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
Bartlomiej Zolnierkiewiczb8e73fb2008-04-26 22:25:21 +0200509int ide_allocate_dma_engine(ide_hwif_t *hwif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510{
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200511 int prd_size;
Bartlomiej Zolnierkiewicz36501652008-02-01 23:09:31 +0100512
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200513 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200518 prd_size = hwif->prd_max_nents * hwif->prd_ent_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200520 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",
Bartlomiej Zolnierkiewicz5e59c232008-04-26 22:25:20 +0200525 hwif->name);
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200526 return -ENOMEM;
527 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200529 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530}
Bartlomiej Zolnierkiewiczb8e73fb2008-04-26 22:25:21 +0200531EXPORT_SYMBOL_GPL(ide_allocate_dma_engine);
Bartlomiej Zolnierkiewicz5ae54122009-03-31 20:15:20 +0200532
533int ide_dma_prepare(ide_drive_t *drive, struct ide_cmd *cmd)
534{
Bartlomiej Zolnierkiewicz8a4a5732009-03-31 20:15:21 +0200535 const struct ide_dma_ops *dma_ops = drive->hwif->dma_ops;
536
Bartlomiej Zolnierkiewicz5ae54122009-03-31 20:15:20 +0200537 if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0 ||
Bartlomiej Zolnierkiewiczf094d4d2009-03-31 20:15:24 +0200538 (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;
Bartlomiej Zolnierkiewicz88b41322009-03-31 20:15:22 +0200545 drive->waiting_for_dma = 1;
Bartlomiej Zolnierkiewicz5ae54122009-03-31 20:15:20 +0200546 return 0;
Bartlomiej Zolnierkiewiczf094d4d2009-03-31 20:15:24 +0200547out_dma_unmap:
548 ide_dma_unmap_sg(drive, cmd);
549out_map:
550 ide_map_sg(drive, cmd);
551out:
552 return 1;
Bartlomiej Zolnierkiewicz5ae54122009-03-31 20:15:20 +0200553}