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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>
32#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/ide.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/scatterlist.h>
Bartlomiej Zolnierkiewicz5c05ff62008-02-01 23:09:32 +010035#include <linux/dma-mapping.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +020037static const struct drive_list_entry drive_whitelist[] = {
Junio C Hamanoc2d3ce82007-07-09 23:17:56 +020038 { "Micropolis 2112A" , NULL },
39 { "CONNER CTMA 4000" , NULL },
40 { "CONNER CTT8000-A" , NULL },
41 { "ST34342A" , NULL },
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 { NULL , NULL }
43};
44
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +020045static const struct drive_list_entry drive_blacklist[] = {
Junio C Hamanoc2d3ce82007-07-09 23:17:56 +020046 { "WDC AC11000H" , NULL },
47 { "WDC AC22100H" , NULL },
48 { "WDC AC32500H" , NULL },
49 { "WDC AC33100H" , NULL },
50 { "WDC AC31600H" , NULL },
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 { "WDC AC32100H" , "24.09P07" },
52 { "WDC AC23200L" , "21.10N21" },
Junio C Hamanoc2d3ce82007-07-09 23:17:56 +020053 { "Compaq CRD-8241B" , NULL },
54 { "CRD-8400B" , NULL },
55 { "CRD-8480B", NULL },
56 { "CRD-8482B", NULL },
57 { "CRD-84" , 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 },
Junio C Hamano5a6248c2007-05-24 02:42:38 +020074 { "SAMSUNG CD-ROM SN-124", "N001" },
Junio C Hamanoc2d3ce82007-07-09 23:17:56 +020075 { "Seagate STT20000A", NULL },
Bartlomiej Zolnierkiewiczb0bc65b2007-11-27 21:35:56 +010076 { "CD-ROM CDR_U200", "1.09" },
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 { NULL , NULL }
78
79};
80
81/**
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 * ide_dma_intr - IDE DMA interrupt handler
83 * @drive: the drive the interrupt is for
84 *
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +020085 * Handle an interrupt completing a read/write DMA transfer on an
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 * IDE device
87 */
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +020088
89ide_startstop_t ide_dma_intr(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -070090{
Bartlomiej Zolnierkiewiczb73c7ee2008-07-23 19:55:52 +020091 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +020092 struct ide_cmd *cmd = &hwif->cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 u8 stat = 0, dma_stat = 0;
94
Bartlomiej Zolnierkiewicz88b41322009-03-31 20:15:22 +020095 drive->waiting_for_dma = 0;
Bartlomiej Zolnierkiewiczb73c7ee2008-07-23 19:55:52 +020096 dma_stat = hwif->dma_ops->dma_end(drive);
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +020097 ide_dma_unmap_sg(drive, cmd);
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +020098 stat = hwif->tp_ops->read_status(hwif);
Bartlomiej Zolnierkiewiczc47137a2008-02-06 02:57:51 +010099
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200100 if (OK_STAT(stat, DRIVE_READY, drive->bad_wstat | ATA_DRQ)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 if (!dma_stat) {
Bartlomiej Zolnierkiewicz2230d90d2009-03-27 12:46:42 +0100102 if ((cmd->tf_flags & IDE_TFLAG_FS) == 0)
103 ide_finish_cmd(drive, cmd, stat);
104 else
Bartlomiej Zolnierkiewicz130e8862009-03-27 12:46:45 +0100105 ide_complete_rq(drive, 0,
Tejun Heo9780e2d2009-05-07 22:24:40 +0900106 blk_rq_sectors(cmd->rq) << 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 return ide_stopped;
108 }
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +0200109 printk(KERN_ERR "%s: %s: bad DMA status (0x%02x)\n",
110 drive->name, __func__, dma_stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 }
112 return ide_error(drive, "dma_intr", stat);
113}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Bartlomiej Zolnierkiewicz2dbe7e92008-10-13 21:39:47 +0200115int ide_dma_good_drive(ide_drive_t *drive)
Bartlomiej Zolnierkiewicz75d7d962007-10-13 17:47:50 +0200116{
117 return ide_in_drive_list(drive->id, drive_whitelist);
118}
119
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120/**
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +0200121 * ide_dma_map_sg - map IDE scatter gather for DMA I/O
122 * @drive: the drive to map the DMA table for
Bartlomiej Zolnierkiewicz229816942009-03-27 12:46:46 +0100123 * @cmd: command
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 *
Bartlomiej Zolnierkiewicz5c05ff62008-02-01 23:09:32 +0100125 * Perform the DMA mapping magic necessary to access the source or
126 * target buffers of a request via DMA. The lower layers of the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 * kernel provide the necessary cache management so that we can
Bartlomiej Zolnierkiewicz5c05ff62008-02-01 23:09:32 +0100128 * operate in a portable fashion.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 */
130
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +0200131static int ide_dma_map_sg(ide_drive_t *drive, struct ide_cmd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132{
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +0200133 ide_hwif_t *hwif = drive->hwif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 struct scatterlist *sg = hwif->sg_table;
FUJITA Tomonori5d827202009-03-13 21:16:13 +0100135 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
Bartlomiej Zolnierkiewicz229816942009-03-27 12:46:46 +0100137 if (cmd->tf_flags & IDE_TFLAG_WRITE)
Bartlomiej Zolnierkiewiczb6308ee2009-03-27 12:46:38 +0100138 cmd->sg_dma_direction = DMA_TO_DEVICE;
Bartlomiej Zolnierkiewicz229816942009-03-27 12:46:46 +0100139 else
140 cmd->sg_dma_direction = DMA_FROM_DEVICE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
Bartlomiej Zolnierkiewiczb6308ee2009-03-27 12:46:38 +0100142 i = dma_map_sg(hwif->dev, sg, cmd->sg_nents, cmd->sg_dma_direction);
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +0200143 if (i) {
Bartlomiej Zolnierkiewiczb6308ee2009-03-27 12:46:38 +0100144 cmd->orig_sg_nents = cmd->sg_nents;
145 cmd->sg_nents = i;
FUJITA Tomonori5d827202009-03-13 21:16:13 +0100146 }
147
148 return i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151/**
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +0200152 * ide_dma_unmap_sg - clean up DMA mapping
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 * @drive: The drive to unmap
154 *
155 * Teardown mappings after DMA has completed. This must be called
156 * after the completion of each use of ide_build_dmatable and before
157 * the next use of ide_build_dmatable. Failure to do so will cause
158 * an oops as only one mapping can be live for each target at a given
159 * time.
160 */
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +0200161
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +0200162void ide_dma_unmap_sg(ide_drive_t *drive, struct ide_cmd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163{
Bartlomiej Zolnierkiewicz36501652008-02-01 23:09:31 +0100164 ide_hwif_t *hwif = drive->hwif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
Bartlomiej Zolnierkiewiczb6308ee2009-03-27 12:46:38 +0100166 dma_unmap_sg(hwif->dev, hwif->sg_table, cmd->orig_sg_nents,
167 cmd->sg_dma_direction);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168}
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +0200169EXPORT_SYMBOL_GPL(ide_dma_unmap_sg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171/**
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100172 * ide_dma_off_quietly - Generic DMA kill
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 * @drive: drive to control
174 *
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +0200175 * Turn off the current DMA on this IDE controller.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 */
177
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100178void ide_dma_off_quietly(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179{
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200180 drive->dev_flags &= ~IDE_DFLAG_USING_DMA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 ide_toggle_bounce(drive, 0);
182
Bartlomiej Zolnierkiewicz5e37bdc2008-04-26 22:25:24 +0200183 drive->hwif->dma_ops->dma_host_set(drive, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184}
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100185EXPORT_SYMBOL(ide_dma_off_quietly);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
187/**
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100188 * ide_dma_off - disable DMA on a device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 * @drive: drive to disable DMA on
190 *
191 * Disable IDE DMA for a device on this IDE controller.
192 * Inform the user that DMA has been disabled.
193 */
194
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100195void ide_dma_off(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196{
197 printk(KERN_INFO "%s: DMA disabled\n", drive->name);
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +0100198 ide_dma_off_quietly(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199}
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100200EXPORT_SYMBOL(ide_dma_off);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202/**
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +0100203 * ide_dma_on - Enable DMA on a device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 * @drive: drive to enable DMA on
205 *
206 * Enable IDE DMA for a device on this IDE controller.
207 */
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +0100208
209void ide_dma_on(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210{
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200211 drive->dev_flags |= IDE_DFLAG_USING_DMA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 ide_toggle_bounce(drive, 1);
213
Bartlomiej Zolnierkiewicz5e37bdc2008-04-26 22:25:24 +0200214 drive->hwif->dma_ops->dma_host_set(drive, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215}
216
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +0200217int __ide_dma_bad_drive(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218{
Bartlomiej Zolnierkiewicz4dde4492008-10-10 22:39:19 +0200219 u16 *id = drive->id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
Jordan Crouse65e5f2e2005-12-15 02:16:18 +0100221 int blacklist = ide_in_drive_list(id, drive_blacklist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 if (blacklist) {
223 printk(KERN_WARNING "%s: Disabling (U)DMA for %s (blacklisted)\n",
Bartlomiej Zolnierkiewicz4dde4492008-10-10 22:39:19 +0200224 drive->name, (char *)&id[ATA_ID_PROD]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 return blacklist;
226 }
227 return 0;
228}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229EXPORT_SYMBOL(__ide_dma_bad_drive);
230
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200231static const u8 xfer_mode_bases[] = {
232 XFER_UDMA_0,
233 XFER_MW_DMA_0,
234 XFER_SW_DMA_0,
235};
236
Bartlomiej Zolnierkiewicz7670df72007-10-11 23:53:59 +0200237static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base, u8 req_mode)
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200238{
Bartlomiej Zolnierkiewicz4dde4492008-10-10 22:39:19 +0200239 u16 *id = drive->id;
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200240 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewiczac95bee2008-04-26 22:25:14 +0200241 const struct ide_port_ops *port_ops = hwif->port_ops;
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200242 unsigned int mask = 0;
243
Bartlomiej Zolnierkiewiczdb3f99e2008-10-13 21:39:47 +0200244 switch (base) {
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200245 case XFER_UDMA_0:
Bartlomiej Zolnierkiewicz4dde4492008-10-10 22:39:19 +0200246 if ((id[ATA_ID_FIELD_VALID] & 4) == 0)
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200247 break;
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200248 mask = id[ATA_ID_UDMA_MODES];
Bartlomiej Zolnierkiewiczac95bee2008-04-26 22:25:14 +0200249 if (port_ops && port_ops->udma_filter)
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200250 mask &= port_ops->udma_filter(drive);
Sergei Shtylyov851dd332007-10-11 23:53:59 +0200251 else
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200252 mask &= hwif->ultra_mask;
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200253
Bartlomiej Zolnierkiewicz7670df72007-10-11 23:53:59 +0200254 /*
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 }
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200261 break;
262 case XFER_MW_DMA_0:
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200263 mask = id[ATA_ID_MWDMA_MODES];
Sergei Shtylyov74638c82009-03-31 20:15:28 +0200264
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
Bartlomiej Zolnierkiewiczac95bee2008-04-26 22:25:14 +0200272 if (port_ops && port_ops->mdma_filter)
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200273 mask &= port_ops->mdma_filter(drive);
Sergei Shtylyovb4e44362007-10-11 23:53:58 +0200274 else
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200275 mask &= hwif->mwdma_mask;
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200276 break;
277 case XFER_SW_DMA_0:
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200278 mask = id[ATA_ID_SWDMA_MODES];
279 if (!(mask & ATA_SWDMA2) && (id[ATA_ID_OLD_DMA_MODES] >> 8)) {
Bartlomiej Zolnierkiewicz48fb2682008-10-10 22:39:19 +0200280 u8 mode = id[ATA_ID_OLD_DMA_MODES] >> 8;
Bartlomiej Zolnierkiewicz15a4f942007-07-09 23:17:57 +0200281
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)
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200287 mask = (2 << mode) - 1;
Bartlomiej Zolnierkiewicz15a4f942007-07-09 23:17:57 +0200288 }
Sergei Shtylyov8d64fcd2009-03-31 20:15:27 +0200289 mask &= hwif->swdma_mask;
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200290 break;
291 default:
292 BUG();
293 break;
294 }
295
296 return mask;
297}
298
299/**
Bartlomiej Zolnierkiewicz7670df72007-10-11 23:53:59 +0200300 * ide_find_dma_mode - compute DMA speed
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200301 * @drive: IDE device
Bartlomiej Zolnierkiewicz7670df72007-10-11 23:53:59 +0200302 * @req_mode: requested mode
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200303 *
Bartlomiej Zolnierkiewicz7670df72007-10-11 23:53:59 +0200304 * 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.
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200309 */
310
Bartlomiej Zolnierkiewicz7670df72007-10-11 23:53:59 +0200311u8 ide_find_dma_mode(ide_drive_t *drive, u8 req_mode)
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200312{
313 ide_hwif_t *hwif = drive->hwif;
314 unsigned int mask;
315 int x, i;
316 u8 mode = 0;
317
Bartlomiej Zolnierkiewicz33c10022007-10-19 00:30:06 +0200318 if (drive->media != ide_disk) {
319 if (hwif->host_flags & IDE_HFLAG_NO_ATAPI_DMA)
320 return 0;
321 }
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200322
323 for (i = 0; i < ARRAY_SIZE(xfer_mode_bases); i++) {
Bartlomiej Zolnierkiewicz7670df72007-10-11 23:53:59 +0200324 if (req_mode < xfer_mode_bases[i])
325 continue;
326 mask = ide_get_mode_mask(drive, xfer_mode_bases[i], req_mode);
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200327 x = fls(mask) - 1;
328 if (x >= 0) {
329 mode = xfer_mode_bases[i] + x;
330 break;
331 }
332 }
333
Bartlomiej Zolnierkiewicz75d7d962007-10-13 17:47:50 +0200334 if (hwif->chipset == ide_acorn && mode == 0) {
335 /*
336 * is this correct?
337 */
Bartlomiej Zolnierkiewicz4dde4492008-10-10 22:39:19 +0200338 if (ide_dma_good_drive(drive) &&
339 drive->id[ATA_ID_EIDE_DMA_TIME] < 150)
Bartlomiej Zolnierkiewicz75d7d962007-10-13 17:47:50 +0200340 mode = XFER_MW_DMA_1;
341 }
342
Bartlomiej Zolnierkiewicz3ab7efe2007-12-12 23:31:58 +0100343 mode = min(mode, req_mode);
344
345 printk(KERN_INFO "%s: %s mode selected\n", drive->name,
Bartlomiej Zolnierkiewiczd34887d2007-11-05 21:42:27 +0100346 mode ? ide_xfer_verbose(mode) : "no DMA");
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200347
Bartlomiej Zolnierkiewicz3ab7efe2007-12-12 23:31:58 +0100348 return mode;
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200349}
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200350
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200351static int ide_tune_dma(ide_drive_t *drive)
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200352{
Bartlomiej Zolnierkiewicz8704de82008-01-26 20:13:00 +0100353 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200354 u8 speed;
355
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200356 if (ata_id_has_dma(drive->id) == 0 ||
357 (drive->dev_flags & IDE_DFLAG_NODMA))
Bartlomiej Zolnierkiewicz122ab082007-05-16 00:51:46 +0200358 return 0;
359
360 /* consult the list of known "bad" drives */
361 if (__ide_dma_bad_drive(drive))
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200362 return 0;
363
Bartlomiej Zolnierkiewicz8704de82008-01-26 20:13:00 +0100364 if (hwif->host_flags & IDE_HFLAG_TRUST_BIOS_FOR_DMA)
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200365 return config_drive_for_dma(drive);
366
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200367 speed = ide_max_dma_mode(drive);
368
Bartlomiej Zolnierkiewicz951784b2008-04-26 17:36:38 +0200369 if (!speed)
370 return 0;
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200371
Bartlomiej Zolnierkiewicz88b2b322007-10-13 17:47:51 +0200372 if (ide_set_dma_mode(drive, speed))
Bartlomiej Zolnierkiewicz4728d542007-05-16 00:51:46 +0200373 return 0;
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200374
Bartlomiej Zolnierkiewicz4728d542007-05-16 00:51:46 +0200375 return 1;
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200376}
377
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200378static int ide_dma_check(ide_drive_t *drive)
379{
380 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200381
Bartlomiej Zolnierkiewiczba4b2e62008-07-23 19:55:55 +0200382 if (ide_tune_dma(drive))
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200383 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
Bartlomiej Zolnierkiewiczba4b2e62008-07-23 19:55:55 +0200391 return -1;
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200392}
393
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100394int ide_set_dma(ide_drive_t *drive)
395{
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100396 int rc;
397
Bartlomiej Zolnierkiewicz7b905992008-01-25 22:17:19 +0100398 /*
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 */
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +0100404 ide_dma_off_quietly(drive);
Bartlomiej Zolnierkiewicz7b905992008-01-25 22:17:19 +0100405
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200406 rc = ide_dma_check(drive);
Bartlomiej Zolnierkiewicz7b905992008-01-25 22:17:19 +0100407 if (rc)
408 return rc;
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100409
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +0100410 ide_dma_on(drive);
411
412 return 0;
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100413}
414
Bartlomiej Zolnierkiewicz578cfa02008-02-02 19:56:47 +0100415void 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
Bartlomiej Zolnierkiewiczde23ec92008-10-13 21:39:46 +0200435void ide_dma_lost_irq(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436{
Bartlomiej Zolnierkiewiczde23ec92008-10-13 21:39:46 +0200437 printk(KERN_ERR "%s: DMA interrupt recovery\n", drive->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438}
Bartlomiej Zolnierkiewiczde23ec92008-10-13 21:39:46 +0200439EXPORT_SYMBOL_GPL(ide_dma_lost_irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
Bartlomiej Zolnierkiewicz65ca5372009-03-24 23:22:43 +0100441/*
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;
Bartlomiej Zolnierkiewicz35c9b4d2009-03-31 20:15:19 +0200449 const struct ide_dma_ops *dma_ops = hwif->dma_ops;
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +0200450 struct ide_cmd *cmd = &hwif->cmd;
Bartlomiej Zolnierkiewicz65ca5372009-03-24 23:22:43 +0100451 struct request *rq;
452 ide_startstop_t ret = ide_stopped;
453
454 /*
455 * end current dma transaction
456 */
457
458 if (error < 0) {
459 printk(KERN_WARNING "%s: DMA timeout error\n", drive->name);
Bartlomiej Zolnierkiewicz88b41322009-03-31 20:15:22 +0200460 drive->waiting_for_dma = 0;
Bartlomiej Zolnierkiewicz35c9b4d2009-03-31 20:15:19 +0200461 (void)dma_ops->dma_end(drive);
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +0200462 ide_dma_unmap_sg(drive, cmd);
Bartlomiej Zolnierkiewicz65ca5372009-03-24 23:22:43 +0100463 ret = ide_error(drive, "dma timeout error",
464 hwif->tp_ops->read_status(hwif));
465 } else {
466 printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name);
Bartlomiej Zolnierkiewicz35c9b4d2009-03-31 20:15:19 +0200467 if (dma_ops->dma_clear)
468 dma_ops->dma_clear(drive);
Bartlomiej Zolnierkiewicz1cee52d2009-03-31 20:15:19 +0200469 printk(KERN_ERR "%s: timeout waiting for DMA\n", drive->name);
470 if (dma_ops->dma_test_irq(drive) == 0) {
471 ide_dump_status(drive, "DMA timeout",
472 hwif->tp_ops->read_status(hwif));
Bartlomiej Zolnierkiewicz88b41322009-03-31 20:15:22 +0200473 drive->waiting_for_dma = 0;
Bartlomiej Zolnierkiewicz1cee52d2009-03-31 20:15:19 +0200474 (void)dma_ops->dma_end(drive);
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +0200475 ide_dma_unmap_sg(drive, cmd);
Bartlomiej Zolnierkiewicz1cee52d2009-03-31 20:15:19 +0200476 }
Bartlomiej Zolnierkiewicz65ca5372009-03-24 23:22:43 +0100477 }
478
479 /*
480 * disable dma for now, but remember that we did so because of
481 * a timeout -- we'll reenable after we finish this next request
482 * (or rather the first chunk of it) in pio.
483 */
484 drive->dev_flags |= IDE_DFLAG_DMA_PIO_RETRY;
485 drive->retry_pio++;
486 ide_dma_off_quietly(drive);
487
488 /*
489 * un-busy drive etc and make sure request is sane
490 */
Bartlomiej Zolnierkiewicz65ca5372009-03-24 23:22:43 +0100491 rq = hwif->rq;
Tejun Heo586cf262009-04-21 12:16:56 +0900492 if (rq) {
493 hwif->rq = NULL;
494 rq->errors = 0;
495 }
Bartlomiej Zolnierkiewicz65ca5372009-03-24 23:22:43 +0100496 return ret;
497}
498
Bartlomiej Zolnierkiewicz0d1bad22008-04-26 22:25:19 +0200499void ide_release_dma_engine(ide_hwif_t *hwif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500{
501 if (hwif->dmatable_cpu) {
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200502 int prd_size = hwif->prd_max_nents * hwif->prd_ent_size;
Bartlomiej Zolnierkiewicz36501652008-02-01 23:09:31 +0100503
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200504 dma_free_coherent(hwif->dev, prd_size,
505 hwif->dmatable_cpu, hwif->dmatable_dma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 hwif->dmatable_cpu = NULL;
507 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508}
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200509EXPORT_SYMBOL_GPL(ide_release_dma_engine);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510
Bartlomiej Zolnierkiewiczb8e73fb2008-04-26 22:25:21 +0200511int ide_allocate_dma_engine(ide_hwif_t *hwif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512{
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200513 int prd_size;
Bartlomiej Zolnierkiewicz36501652008-02-01 23:09:31 +0100514
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200515 if (hwif->prd_max_nents == 0)
516 hwif->prd_max_nents = PRD_ENTRIES;
517 if (hwif->prd_ent_size == 0)
518 hwif->prd_ent_size = PRD_BYTES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200520 prd_size = hwif->prd_max_nents * hwif->prd_ent_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200522 hwif->dmatable_cpu = dma_alloc_coherent(hwif->dev, prd_size,
523 &hwif->dmatable_dma,
524 GFP_ATOMIC);
525 if (hwif->dmatable_cpu == NULL) {
526 printk(KERN_ERR "%s: unable to allocate PRD table\n",
Bartlomiej Zolnierkiewicz5e59c232008-04-26 22:25:20 +0200527 hwif->name);
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200528 return -ENOMEM;
529 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
Bartlomiej Zolnierkiewicz2bbd57c2008-10-13 21:39:47 +0200531 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532}
Bartlomiej Zolnierkiewiczb8e73fb2008-04-26 22:25:21 +0200533EXPORT_SYMBOL_GPL(ide_allocate_dma_engine);
Bartlomiej Zolnierkiewicz5ae54122009-03-31 20:15:20 +0200534
535int ide_dma_prepare(ide_drive_t *drive, struct ide_cmd *cmd)
536{
Bartlomiej Zolnierkiewicz8a4a5732009-03-31 20:15:21 +0200537 const struct ide_dma_ops *dma_ops = drive->hwif->dma_ops;
538
Bartlomiej Zolnierkiewicz5ae54122009-03-31 20:15:20 +0200539 if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0 ||
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +0200540 (dma_ops->dma_check && dma_ops->dma_check(drive, cmd)))
541 goto out;
542 ide_map_sg(drive, cmd);
543 if (ide_dma_map_sg(drive, cmd) == 0)
544 goto out_map;
545 if (dma_ops->dma_setup(drive, cmd))
546 goto out_dma_unmap;
Bartlomiej Zolnierkiewicz88b41322009-03-31 20:15:22 +0200547 drive->waiting_for_dma = 1;
Bartlomiej Zolnierkiewicz5ae54122009-03-31 20:15:20 +0200548 return 0;
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +0200549out_dma_unmap:
550 ide_dma_unmap_sg(drive, cmd);
551out_map:
552 ide_map_sg(drive, cmd);
553out:
554 return 1;
Bartlomiej Zolnierkiewicz5ae54122009-03-31 20:15:20 +0200555}