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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/ide.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/scatterlist.h>
Bartlomiej Zolnierkiewicz5c05ff62008-02-01 23:09:32 +010036#include <linux/dma-mapping.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +020038static const struct drive_list_entry drive_whitelist[] = {
Junio C Hamanoc2d3ce82007-07-09 23:17:56 +020039 { "Micropolis 2112A" , NULL },
40 { "CONNER CTMA 4000" , NULL },
41 { "CONNER CTT8000-A" , NULL },
42 { "ST34342A" , NULL },
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 { NULL , NULL }
44};
45
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +020046static const struct drive_list_entry drive_blacklist[] = {
Junio C Hamanoc2d3ce82007-07-09 23:17:56 +020047 { "WDC AC11000H" , NULL },
48 { "WDC AC22100H" , NULL },
49 { "WDC AC32500H" , NULL },
50 { "WDC AC33100H" , NULL },
51 { "WDC AC31600H" , NULL },
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 { "WDC AC32100H" , "24.09P07" },
53 { "WDC AC23200L" , "21.10N21" },
Junio C Hamanoc2d3ce82007-07-09 23:17:56 +020054 { "Compaq CRD-8241B" , NULL },
55 { "CRD-8400B" , NULL },
56 { "CRD-8480B", NULL },
57 { "CRD-8482B", NULL },
58 { "CRD-84" , NULL },
59 { "SanDisk SDP3B" , NULL },
60 { "SanDisk SDP3B-64" , NULL },
61 { "SANYO CD-ROM CRD" , NULL },
62 { "HITACHI CDR-8" , NULL },
63 { "HITACHI CDR-8335" , NULL },
64 { "HITACHI CDR-8435" , NULL },
65 { "Toshiba CD-ROM XM-6202B" , NULL },
66 { "TOSHIBA CD-ROM XM-1702BC", NULL },
67 { "CD-532E-A" , NULL },
68 { "E-IDE CD-ROM CR-840", NULL },
69 { "CD-ROM Drive/F5A", NULL },
70 { "WPI CDD-820", NULL },
71 { "SAMSUNG CD-ROM SC-148C", NULL },
72 { "SAMSUNG CD-ROM SC", NULL },
73 { "ATAPI CD-ROM DRIVE 40X MAXIMUM", NULL },
74 { "_NEC DV5800A", NULL },
Junio C Hamano5a6248c2007-05-24 02:42:38 +020075 { "SAMSUNG CD-ROM SN-124", "N001" },
Junio C Hamanoc2d3ce82007-07-09 23:17:56 +020076 { "Seagate STT20000A", NULL },
Bartlomiej Zolnierkiewiczb0bc65b2007-11-27 21:35:56 +010077 { "CD-ROM CDR_U200", "1.09" },
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 { NULL , NULL }
79
80};
81
82/**
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 * ide_dma_intr - IDE DMA interrupt handler
84 * @drive: the drive the interrupt is for
85 *
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +020086 * Handle an interrupt completing a read/write DMA transfer on an
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 * IDE device
88 */
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +020089
90ide_startstop_t ide_dma_intr(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -070091{
Bartlomiej Zolnierkiewiczb73c7ee2008-07-23 19:55:52 +020092 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +020093 struct ide_cmd *cmd = &hwif->cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 u8 stat = 0, dma_stat = 0;
95
Bartlomiej Zolnierkiewicz88b41322009-03-31 20:15:22 +020096 drive->waiting_for_dma = 0;
Bartlomiej Zolnierkiewiczb73c7ee2008-07-23 19:55:52 +020097 dma_stat = hwif->dma_ops->dma_end(drive);
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +020098 ide_dma_unmap_sg(drive, cmd);
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +020099 stat = hwif->tp_ops->read_status(hwif);
Bartlomiej Zolnierkiewiczc47137a2008-02-06 02:57:51 +0100100
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200101 if (OK_STAT(stat, DRIVE_READY, drive->bad_wstat | ATA_DRQ)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 if (!dma_stat) {
Bartlomiej Zolnierkiewicz2230d90d2009-03-27 12:46:42 +0100103 if ((cmd->tf_flags & IDE_TFLAG_FS) == 0)
104 ide_finish_cmd(drive, cmd, stat);
105 else
Bartlomiej Zolnierkiewicz130e8862009-03-27 12:46:45 +0100106 ide_complete_rq(drive, 0,
Tejun Heo9780e2d2009-05-07 22:24:40 +0900107 blk_rq_sectors(cmd->rq) << 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 return ide_stopped;
109 }
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +0200110 printk(KERN_ERR "%s: %s: bad DMA status (0x%02x)\n",
111 drive->name, __func__, dma_stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 }
113 return ide_error(drive, "dma_intr", stat);
114}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
Bartlomiej Zolnierkiewicz2dbe7e92008-10-13 21:39:47 +0200116int ide_dma_good_drive(ide_drive_t *drive)
Bartlomiej Zolnierkiewicz75d7d962007-10-13 17:47:50 +0200117{
118 return ide_in_drive_list(drive->id, drive_whitelist);
119}
120
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121/**
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +0200122 * ide_dma_map_sg - map IDE scatter gather for DMA I/O
123 * @drive: the drive to map the DMA table for
Bartlomiej Zolnierkiewicz229816942009-03-27 12:46:46 +0100124 * @cmd: command
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 *
Bartlomiej Zolnierkiewicz5c05ff62008-02-01 23:09:32 +0100126 * Perform the DMA mapping magic necessary to access the source or
127 * target buffers of a request via DMA. The lower layers of the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 * kernel provide the necessary cache management so that we can
Bartlomiej Zolnierkiewicz5c05ff62008-02-01 23:09:32 +0100129 * operate in a portable fashion.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 */
131
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +0200132static int ide_dma_map_sg(ide_drive_t *drive, struct ide_cmd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133{
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +0200134 ide_hwif_t *hwif = drive->hwif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 struct scatterlist *sg = hwif->sg_table;
FUJITA Tomonori5d827202009-03-13 21:16:13 +0100136 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Bartlomiej Zolnierkiewicz229816942009-03-27 12:46:46 +0100138 if (cmd->tf_flags & IDE_TFLAG_WRITE)
Bartlomiej Zolnierkiewiczb6308ee2009-03-27 12:46:38 +0100139 cmd->sg_dma_direction = DMA_TO_DEVICE;
Bartlomiej Zolnierkiewicz229816942009-03-27 12:46:46 +0100140 else
141 cmd->sg_dma_direction = DMA_FROM_DEVICE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
Bartlomiej Zolnierkiewiczb6308ee2009-03-27 12:46:38 +0100143 i = dma_map_sg(hwif->dev, sg, cmd->sg_nents, cmd->sg_dma_direction);
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +0200144 if (i) {
Bartlomiej Zolnierkiewiczb6308ee2009-03-27 12:46:38 +0100145 cmd->orig_sg_nents = cmd->sg_nents;
146 cmd->sg_nents = i;
FUJITA Tomonori5d827202009-03-13 21:16:13 +0100147 }
148
149 return i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152/**
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +0200153 * ide_dma_unmap_sg - clean up DMA mapping
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 * @drive: The drive to unmap
155 *
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
160 * time.
161 */
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +0200162
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +0200163void ide_dma_unmap_sg(ide_drive_t *drive, struct ide_cmd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164{
Bartlomiej Zolnierkiewicz36501652008-02-01 23:09:31 +0100165 ide_hwif_t *hwif = drive->hwif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
Bartlomiej Zolnierkiewiczb6308ee2009-03-27 12:46:38 +0100167 dma_unmap_sg(hwif->dev, hwif->sg_table, cmd->orig_sg_nents,
168 cmd->sg_dma_direction);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169}
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +0200170EXPORT_SYMBOL_GPL(ide_dma_unmap_sg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172/**
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100173 * ide_dma_off_quietly - Generic DMA kill
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 * @drive: drive to control
175 *
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +0200176 * Turn off the current DMA on this IDE controller.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 */
178
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100179void ide_dma_off_quietly(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180{
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200181 drive->dev_flags &= ~IDE_DFLAG_USING_DMA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 ide_toggle_bounce(drive, 0);
183
Bartlomiej Zolnierkiewicz5e37bdc2008-04-26 22:25:24 +0200184 drive->hwif->dma_ops->dma_host_set(drive, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185}
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100186EXPORT_SYMBOL(ide_dma_off_quietly);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
188/**
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100189 * ide_dma_off - disable DMA on a device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 * @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
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100196void ide_dma_off(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197{
198 printk(KERN_INFO "%s: DMA disabled\n", drive->name);
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +0100199 ide_dma_off_quietly(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200}
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100201EXPORT_SYMBOL(ide_dma_off);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203/**
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +0100204 * ide_dma_on - Enable DMA on a device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 * @drive: drive to enable DMA on
206 *
207 * Enable IDE DMA for a device on this IDE controller.
208 */
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +0100209
210void ide_dma_on(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211{
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200212 drive->dev_flags |= IDE_DFLAG_USING_DMA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 ide_toggle_bounce(drive, 1);
214
Bartlomiej Zolnierkiewicz5e37bdc2008-04-26 22:25:24 +0200215 drive->hwif->dma_ops->dma_host_set(drive, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216}
217
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +0200218int __ide_dma_bad_drive(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219{
Bartlomiej Zolnierkiewicz4dde4492008-10-10 22:39:19 +0200220 u16 *id = drive->id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
Jordan Crouse65e5f2e2005-12-15 02:16:18 +0100222 int blacklist = ide_in_drive_list(id, drive_blacklist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 if (blacklist) {
224 printk(KERN_WARNING "%s: Disabling (U)DMA for %s (blacklisted)\n",
Bartlomiej Zolnierkiewicz4dde4492008-10-10 22:39:19 +0200225 drive->name, (char *)&id[ATA_ID_PROD]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 return blacklist;
227 }
228 return 0;
229}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230EXPORT_SYMBOL(__ide_dma_bad_drive);
231
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200232static const u8 xfer_mode_bases[] = {
233 XFER_UDMA_0,
234 XFER_MW_DMA_0,
235 XFER_SW_DMA_0,
236};
237
Bartlomiej Zolnierkiewicz7670df72007-10-11 23:53:59 +0200238static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base, u8 req_mode)
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200239{
Bartlomiej Zolnierkiewicz4dde4492008-10-10 22:39:19 +0200240 u16 *id = drive->id;
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200241 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewiczac95bee2008-04-26 22:25:14 +0200242 const struct ide_port_ops *port_ops = hwif->port_ops;
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200243 unsigned int mask = 0;
244
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +0200245 switch (base) {
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200246 case XFER_UDMA_0:
Bartlomiej Zolnierkiewicz4dde4492008-10-10 22:39:19 +0200247 if ((id[ATA_ID_FIELD_VALID] & 4) == 0)
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200248 break;
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200249 mask = id[ATA_ID_UDMA_MODES];
Bartlomiej Zolnierkiewiczac95bee2008-04-26 22:25:14 +0200250 if (port_ops && port_ops->udma_filter)
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200251 mask &= port_ops->udma_filter(drive);
Sergei Shtylyov851dd332007-10-11 23:53:59 +0200252 else
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200253 mask &= hwif->ultra_mask;
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200254
Bartlomiej Zolnierkiewicz7670df72007-10-11 23:53:59 +0200255 /*
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 }
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200262 break;
263 case XFER_MW_DMA_0:
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200264 mask = id[ATA_ID_MWDMA_MODES];
Sergei Shtylyov74638c82009-03-31 20:15:28 +0200265
266 /* Also look for the CF specific MWDMA modes... */
267 if (ata_id_is_cfa(id) && (id[ATA_ID_CFA_MODES] & 0x38)) {
268 u8 mode = ((id[ATA_ID_CFA_MODES] & 0x38) >> 3) - 1;
269
270 mask |= ((2 << mode) - 1) << 3;
271 }
272
Bartlomiej Zolnierkiewiczac95bee2008-04-26 22:25:14 +0200273 if (port_ops && port_ops->mdma_filter)
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200274 mask &= port_ops->mdma_filter(drive);
Sergei Shtylyovb4e44362007-10-11 23:53:58 +0200275 else
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200276 mask &= hwif->mwdma_mask;
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200277 break;
278 case XFER_SW_DMA_0:
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200279 mask = id[ATA_ID_SWDMA_MODES];
280 if (!(mask & ATA_SWDMA2) && (id[ATA_ID_OLD_DMA_MODES] >> 8)) {
Bartlomiej Zolnierkiewicz48fb2682008-10-10 22:39:19 +0200281 u8 mode = id[ATA_ID_OLD_DMA_MODES] >> 8;
Bartlomiej Zolnierkiewicz15a4f942007-07-09 23:17:57 +0200282
283 /*
284 * if the mode is valid convert it to the mask
285 * (the maximum allowed mode is XFER_SW_DMA_2)
286 */
287 if (mode <= 2)
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200288 mask = (2 << mode) - 1;
Bartlomiej Zolnierkiewicz15a4f942007-07-09 23:17:57 +0200289 }
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200290 mask &= hwif->swdma_mask;
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200291 break;
292 default:
293 BUG();
294 break;
295 }
296
297 return mask;
298}
299
300/**
Bartlomiej Zolnierkiewicz7670df72007-10-11 23:53:59 +0200301 * ide_find_dma_mode - compute DMA speed
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200302 * @drive: IDE device
Bartlomiej Zolnierkiewicz7670df72007-10-11 23:53:59 +0200303 * @req_mode: requested mode
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200304 *
Bartlomiej Zolnierkiewicz7670df72007-10-11 23:53:59 +0200305 * Checks the drive/host capabilities and finds the speed to use for
306 * the DMA transfer. The speed is then limited by the requested mode.
307 *
308 * Returns 0 if the drive/host combination is incapable of DMA transfers
309 * or if the requested mode is not a DMA mode.
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200310 */
311
Bartlomiej Zolnierkiewicz7670df72007-10-11 23:53:59 +0200312u8 ide_find_dma_mode(ide_drive_t *drive, u8 req_mode)
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200313{
314 ide_hwif_t *hwif = drive->hwif;
315 unsigned int mask;
316 int x, i;
317 u8 mode = 0;
318
Bartlomiej Zolnierkiewicz33c10022007-10-19 00:30:06 +0200319 if (drive->media != ide_disk) {
320 if (hwif->host_flags & IDE_HFLAG_NO_ATAPI_DMA)
321 return 0;
322 }
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200323
324 for (i = 0; i < ARRAY_SIZE(xfer_mode_bases); i++) {
Bartlomiej Zolnierkiewicz7670df72007-10-11 23:53:59 +0200325 if (req_mode < xfer_mode_bases[i])
326 continue;
327 mask = ide_get_mode_mask(drive, xfer_mode_bases[i], req_mode);
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200328 x = fls(mask) - 1;
329 if (x >= 0) {
330 mode = xfer_mode_bases[i] + x;
331 break;
332 }
333 }
334
Bartlomiej Zolnierkiewicz75d7d962007-10-13 17:47:50 +0200335 if (hwif->chipset == ide_acorn && mode == 0) {
336 /*
337 * is this correct?
338 */
Bartlomiej Zolnierkiewicz4dde4492008-10-10 22:39:19 +0200339 if (ide_dma_good_drive(drive) &&
340 drive->id[ATA_ID_EIDE_DMA_TIME] < 150)
Bartlomiej Zolnierkiewicz75d7d962007-10-13 17:47:50 +0200341 mode = XFER_MW_DMA_1;
342 }
343
Bartlomiej Zolnierkiewicz3ab7efe2007-12-12 23:31:58 +0100344 mode = min(mode, req_mode);
345
346 printk(KERN_INFO "%s: %s mode selected\n", drive->name,
Bartlomiej Zolnierkiewiczd34887d2007-11-05 21:42:27 +0100347 mode ? ide_xfer_verbose(mode) : "no DMA");
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200348
Bartlomiej Zolnierkiewicz3ab7efe2007-12-12 23:31:58 +0100349 return mode;
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200350}
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200351
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200352static int ide_tune_dma(ide_drive_t *drive)
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200353{
Bartlomiej Zolnierkiewicz8704de82008-01-26 20:13:00 +0100354 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200355 u8 speed;
356
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200357 if (ata_id_has_dma(drive->id) == 0 ||
358 (drive->dev_flags & IDE_DFLAG_NODMA))
Bartlomiej Zolnierkiewicz122ab082007-05-16 00:51:46 +0200359 return 0;
360
361 /* consult the list of known "bad" drives */
362 if (__ide_dma_bad_drive(drive))
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200363 return 0;
364
Bartlomiej Zolnierkiewicz8704de82008-01-26 20:13:00 +0100365 if (hwif->host_flags & IDE_HFLAG_TRUST_BIOS_FOR_DMA)
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200366 return config_drive_for_dma(drive);
367
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200368 speed = ide_max_dma_mode(drive);
369
Bartlomiej Zolnierkiewicz951784b2008-04-26 17:36:38 +0200370 if (!speed)
371 return 0;
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200372
Bartlomiej Zolnierkiewicz88b2b322007-10-13 17:47:51 +0200373 if (ide_set_dma_mode(drive, speed))
Bartlomiej Zolnierkiewicz4728d542007-05-16 00:51:46 +0200374 return 0;
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200375
Bartlomiej Zolnierkiewicz4728d542007-05-16 00:51:46 +0200376 return 1;
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200377}
378
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200379static int ide_dma_check(ide_drive_t *drive)
380{
381 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200382
Bartlomiej Zolnierkiewiczba4b2e62008-07-23 19:55:55 +0200383 if (ide_tune_dma(drive))
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200384 return 0;
385
386 /* TODO: always do PIO fallback */
387 if (hwif->host_flags & IDE_HFLAG_TRUST_BIOS_FOR_DMA)
388 return -1;
389
390 ide_set_max_pio(drive);
391
Bartlomiej Zolnierkiewiczba4b2e62008-07-23 19:55:55 +0200392 return -1;
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200393}
394
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100395int ide_set_dma(ide_drive_t *drive)
396{
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100397 int rc;
398
Bartlomiej Zolnierkiewicz7b905992008-01-25 22:17:19 +0100399 /*
400 * Force DMAing for the beginning of the check.
401 * Some chipsets appear to do interesting
402 * things, if not checked and cleared.
403 * PARANOIA!!!
404 */
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +0100405 ide_dma_off_quietly(drive);
Bartlomiej Zolnierkiewicz7b905992008-01-25 22:17:19 +0100406
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200407 rc = ide_dma_check(drive);
Bartlomiej Zolnierkiewicz7b905992008-01-25 22:17:19 +0100408 if (rc)
409 return rc;
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100410
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +0100411 ide_dma_on(drive);
412
413 return 0;
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100414}
415
Bartlomiej Zolnierkiewicz578cfa02008-02-02 19:56:47 +0100416void ide_check_dma_crc(ide_drive_t *drive)
417{
418 u8 mode;
419
420 ide_dma_off_quietly(drive);
421 drive->crc_count = 0;
422 mode = drive->current_speed;
423 /*
424 * Don't try non Ultra-DMA modes without iCRC's. Force the
425 * device to PIO and make the user enable SWDMA/MWDMA modes.
426 */
427 if (mode > XFER_UDMA_0 && mode <= XFER_UDMA_7)
428 mode--;
429 else
430 mode = XFER_PIO_4;
431 ide_set_xfer_rate(drive, mode);
432 if (drive->current_speed >= XFER_SW_DMA_0)
433 ide_dma_on(drive);
434}
435
Bartlomiej Zolnierkiewiczde23ec92008-10-13 21:39:46 +0200436void ide_dma_lost_irq(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437{
Bartlomiej Zolnierkiewiczde23ec92008-10-13 21:39:46 +0200438 printk(KERN_ERR "%s: DMA interrupt recovery\n", drive->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439}
Bartlomiej Zolnierkiewiczde23ec92008-10-13 21:39:46 +0200440EXPORT_SYMBOL_GPL(ide_dma_lost_irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441
Bartlomiej Zolnierkiewicz65ca5372009-03-24 23:22:43 +0100442/*
443 * un-busy the port etc, and clear any pending DMA status. we want to
444 * retry the current request in pio mode instead of risking tossing it
445 * all away
446 */
447ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error)
448{
449 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewicz35c9b4d2009-03-31 20:15:19 +0200450 const struct ide_dma_ops *dma_ops = hwif->dma_ops;
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +0200451 struct ide_cmd *cmd = &hwif->cmd;
Bartlomiej Zolnierkiewicz65ca5372009-03-24 23:22:43 +0100452 struct request *rq;
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);
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 Zolnierkiewiczf094d4d82009-03-31 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 Zolnierkiewiczf094d4d82009-03-31 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 /*
490 * un-busy drive etc and make sure request is sane
491 */
Bartlomiej Zolnierkiewicz65ca5372009-03-24 23:22:43 +0100492 rq = hwif->rq;
Tejun Heo586cf262009-04-21 12:16:56 +0900493 if (rq) {
494 hwif->rq = NULL;
495 rq->errors = 0;
Herbert Xu6072f742010-03-31 20:11:59 +0000496 ide_requeue_and_plug(drive, rq);
Tejun Heo586cf262009-04-21 12:16:56 +0900497 }
Bartlomiej Zolnierkiewicz65ca5372009-03-24 23:22:43 +0100498 return ret;
499}
500
Bartlomiej Zolnierkiewicz0d1bad22008-04-26 22:25:19 +0200501void ide_release_dma_engine(ide_hwif_t *hwif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502{
503 if (hwif->dmatable_cpu) {
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200504 int prd_size = hwif->prd_max_nents * hwif->prd_ent_size;
Bartlomiej Zolnierkiewicz36501652008-02-01 23:09:31 +0100505
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200506 dma_free_coherent(hwif->dev, prd_size,
507 hwif->dmatable_cpu, hwif->dmatable_dma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 hwif->dmatable_cpu = NULL;
509 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510}
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200511EXPORT_SYMBOL_GPL(ide_release_dma_engine);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512
Bartlomiej Zolnierkiewiczb8e73fb2008-04-26 22:25:21 +0200513int ide_allocate_dma_engine(ide_hwif_t *hwif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514{
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200515 int prd_size;
Bartlomiej Zolnierkiewicz36501652008-02-01 23:09:31 +0100516
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200517 if (hwif->prd_max_nents == 0)
518 hwif->prd_max_nents = PRD_ENTRIES;
519 if (hwif->prd_ent_size == 0)
520 hwif->prd_ent_size = PRD_BYTES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200522 prd_size = hwif->prd_max_nents * hwif->prd_ent_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200524 hwif->dmatable_cpu = dma_alloc_coherent(hwif->dev, prd_size,
525 &hwif->dmatable_dma,
526 GFP_ATOMIC);
527 if (hwif->dmatable_cpu == NULL) {
528 printk(KERN_ERR "%s: unable to allocate PRD table\n",
Bartlomiej Zolnierkiewicz5e59c232008-04-26 22:25:20 +0200529 hwif->name);
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200530 return -ENOMEM;
531 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200533 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534}
Bartlomiej Zolnierkiewiczb8e73fb2008-04-26 22:25:21 +0200535EXPORT_SYMBOL_GPL(ide_allocate_dma_engine);
Bartlomiej Zolnierkiewicz5ae54122009-03-31 20:15:20 +0200536
537int ide_dma_prepare(ide_drive_t *drive, struct ide_cmd *cmd)
538{
Bartlomiej Zolnierkiewicz8a4a5732009-03-31 20:15:21 +0200539 const struct ide_dma_ops *dma_ops = drive->hwif->dma_ops;
540
Bartlomiej Zolnierkiewicz5ae54122009-03-31 20:15:20 +0200541 if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0 ||
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +0200542 (dma_ops->dma_check && dma_ops->dma_check(drive, cmd)))
543 goto out;
544 ide_map_sg(drive, cmd);
545 if (ide_dma_map_sg(drive, cmd) == 0)
546 goto out_map;
547 if (dma_ops->dma_setup(drive, cmd))
548 goto out_dma_unmap;
Bartlomiej Zolnierkiewicz88b41322009-03-31 20:15:22 +0200549 drive->waiting_for_dma = 1;
Bartlomiej Zolnierkiewicz5ae54122009-03-31 20:15:20 +0200550 return 0;
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +0200551out_dma_unmap:
552 ide_dma_unmap_sg(drive, cmd);
553out_map:
554 ide_map_sg(drive, cmd);
555out:
556 return 1;
Bartlomiej Zolnierkiewicz5ae54122009-03-31 20:15:20 +0200557}