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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/drivers/ide/ide-dma.c Version 4.10 June 9, 2000
3 *
4 * Copyright (c) 1999-2000 Andre Hedrick <andre@linux-ide.org>
5 * May be copied or modified under the terms of the GNU General Public License
6 */
7
8/*
9 * Special Thanks to Mark for his Six years of work.
10 *
11 * Copyright (c) 1995-1998 Mark Lord
12 * May be copied or modified under the terms of the GNU General Public License
13 */
14
15/*
16 * This module provides support for the bus-master IDE DMA functions
17 * of various PCI chipsets, including the Intel PIIX (i82371FB for
18 * the 430 FX chipset), the PIIX3 (i82371SB for the 430 HX/VX and
19 * 440 chipsets), and the PIIX4 (i82371AB for the 430 TX chipset)
20 * ("PIIX" stands for "PCI ISA IDE Xcellerator").
21 *
22 * Pretty much the same code works for other IDE PCI bus-mastering chipsets.
23 *
24 * DMA is supported for all IDE devices (disk drives, cdroms, tapes, floppies).
25 *
26 * By default, DMA support is prepared for use, but is currently enabled only
27 * for drives which already have DMA enabled (UltraDMA or mode 2 multi/single),
28 * or which are recognized as "good" (see table below). Drives with only mode0
29 * or mode1 (multi/single) DMA should also work with this chipset/driver
30 * (eg. MC2112A) but are not enabled by default.
31 *
32 * Use "hdparm -i" to view modes supported by a given drive.
33 *
34 * The hdparm-3.5 (or later) utility can be used for manually enabling/disabling
35 * DMA support, but must be (re-)compiled against this kernel version or later.
36 *
37 * To enable DMA, use "hdparm -d1 /dev/hd?" on a per-drive basis after booting.
38 * If problems arise, ide.c will disable DMA operation after a few retries.
39 * This error recovery mechanism works and has been extremely well exercised.
40 *
41 * IDE drives, depending on their vintage, may support several different modes
42 * of DMA operation. The boot-time modes are indicated with a "*" in
43 * the "hdparm -i" listing, and can be changed with *knowledgeable* use of
44 * the "hdparm -X" feature. There is seldom a need to do this, as drives
45 * normally power-up with their "best" PIO/DMA modes enabled.
46 *
47 * Testing has been done with a rather extensive number of drives,
48 * with Quantum & Western Digital models generally outperforming the pack,
49 * and Fujitsu & Conner (and some Seagate which are really Conner) drives
50 * showing more lackluster throughput.
51 *
52 * Keep an eye on /var/adm/messages for "DMA disabled" messages.
53 *
54 * Some people have reported trouble with Intel Zappa motherboards.
55 * This can be fixed by upgrading the AMI BIOS to version 1.00.04.BS0,
56 * available from ftp://ftp.intel.com/pub/bios/10004bs0.exe
57 * (thanks to Glen Morrell <glen@spin.Stanford.edu> for researching this).
58 *
59 * Thanks to "Christopher J. Reimer" <reimer@doe.carleton.ca> for
60 * fixing the problem with the BIOS on some Acer motherboards.
61 *
62 * Thanks to "Benoit Poulot-Cazajous" <poulot@chorus.fr> for testing
63 * "TX" chipset compatibility and for providing patches for the "TX" chipset.
64 *
65 * Thanks to Christian Brunner <chb@muc.de> for taking a good first crack
66 * at generic DMA -- his patches were referred to when preparing this code.
67 *
68 * Most importantly, thanks to Robert Bringman <rob@mars.trion.com>
69 * for supplying a Promise UDMA board & WD UDMA drive for this work!
70 *
71 * And, yes, Intel Zappa boards really *do* use both PIIX IDE ports.
72 *
73 * ATA-66/100 and recovery functions, I forgot the rest......
74 *
75 */
76
Linus Torvalds1da177e2005-04-16 15:20:36 -070077#include <linux/module.h>
78#include <linux/types.h>
79#include <linux/kernel.h>
80#include <linux/timer.h>
81#include <linux/mm.h>
82#include <linux/interrupt.h>
83#include <linux/pci.h>
84#include <linux/init.h>
85#include <linux/ide.h>
86#include <linux/delay.h>
87#include <linux/scatterlist.h>
88
89#include <asm/io.h>
90#include <asm/irq.h>
91
Linus Torvalds1da177e2005-04-16 15:20:36 -070092static const struct drive_list_entry drive_whitelist [] = {
93
94 { "Micropolis 2112A" , "ALL" },
95 { "CONNER CTMA 4000" , "ALL" },
96 { "CONNER CTT8000-A" , "ALL" },
97 { "ST34342A" , "ALL" },
98 { NULL , NULL }
99};
100
101static const struct drive_list_entry drive_blacklist [] = {
102
103 { "WDC AC11000H" , "ALL" },
104 { "WDC AC22100H" , "ALL" },
105 { "WDC AC32500H" , "ALL" },
106 { "WDC AC33100H" , "ALL" },
107 { "WDC AC31600H" , "ALL" },
108 { "WDC AC32100H" , "24.09P07" },
109 { "WDC AC23200L" , "21.10N21" },
110 { "Compaq CRD-8241B" , "ALL" },
111 { "CRD-8400B" , "ALL" },
112 { "CRD-8480B", "ALL" },
113 { "CRD-8482B", "ALL" },
114 { "CRD-84" , "ALL" },
115 { "SanDisk SDP3B" , "ALL" },
116 { "SanDisk SDP3B-64" , "ALL" },
117 { "SANYO CD-ROM CRD" , "ALL" },
118 { "HITACHI CDR-8" , "ALL" },
119 { "HITACHI CDR-8335" , "ALL" },
120 { "HITACHI CDR-8435" , "ALL" },
121 { "Toshiba CD-ROM XM-6202B" , "ALL" },
Junio C Hamano5a6248c2007-05-24 02:42:38 +0200122 { "TOSHIBA CD-ROM XM-1702BC", "ALL" },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 { "CD-532E-A" , "ALL" },
124 { "E-IDE CD-ROM CR-840", "ALL" },
125 { "CD-ROM Drive/F5A", "ALL" },
126 { "WPI CDD-820", "ALL" },
127 { "SAMSUNG CD-ROM SC-148C", "ALL" },
128 { "SAMSUNG CD-ROM SC", "ALL" },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 { "ATAPI CD-ROM DRIVE 40X MAXIMUM", "ALL" },
130 { "_NEC DV5800A", "ALL" },
Junio C Hamano5a6248c2007-05-24 02:42:38 +0200131 { "SAMSUNG CD-ROM SN-124", "N001" },
132 { "Seagate STT20000A", "ALL" },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 { NULL , NULL }
134
135};
136
137/**
Jordan Crouse65e5f2e2005-12-15 02:16:18 +0100138 * ide_in_drive_list - look for drive in black/white list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 * @id: drive identifier
140 * @drive_table: list to inspect
141 *
142 * Look for a drive in the blacklist and the whitelist tables
143 * Returns 1 if the drive is found in the table.
144 */
145
Jordan Crouse65e5f2e2005-12-15 02:16:18 +0100146int ide_in_drive_list(struct hd_driveid *id, const struct drive_list_entry *drive_table)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147{
148 for ( ; drive_table->id_model ; drive_table++)
149 if ((!strcmp(drive_table->id_model, id->model)) &&
Kirill Smelkov14e0a192006-10-03 01:14:18 -0700150 ((strstr(id->fw_rev, drive_table->id_firmware)) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 (!strcmp(drive_table->id_firmware, "ALL"))))
152 return 1;
153 return 0;
154}
155
156/**
157 * ide_dma_intr - IDE DMA interrupt handler
158 * @drive: the drive the interrupt is for
159 *
160 * Handle an interrupt completing a read/write DMA transfer on an
161 * IDE device
162 */
163
164ide_startstop_t ide_dma_intr (ide_drive_t *drive)
165{
166 u8 stat = 0, dma_stat = 0;
167
168 dma_stat = HWIF(drive)->ide_dma_end(drive);
169 stat = HWIF(drive)->INB(IDE_STATUS_REG); /* get drive status */
170 if (OK_STAT(stat,DRIVE_READY,drive->bad_wstat|DRQ_STAT)) {
171 if (!dma_stat) {
172 struct request *rq = HWGROUP(drive)->rq;
173
174 if (rq->rq_disk) {
175 ide_driver_t *drv;
176
Alexey Dobriyan53b35312006-03-24 03:16:13 -0800177 drv = *(ide_driver_t **)rq->rq_disk->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 drv->end_request(drive, 1, rq->nr_sectors);
179 } else
180 ide_end_request(drive, 1, rq->nr_sectors);
181 return ide_stopped;
182 }
183 printk(KERN_ERR "%s: dma_intr: bad DMA status (dma_stat=%x)\n",
184 drive->name, dma_stat);
185 }
186 return ide_error(drive, "dma_intr", stat);
187}
188
189EXPORT_SYMBOL_GPL(ide_dma_intr);
190
191#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
192/**
193 * ide_build_sglist - map IDE scatter gather for DMA I/O
194 * @drive: the drive to build the DMA table for
195 * @rq: the request holding the sg list
196 *
197 * Perform the PCI mapping magic necessary to access the source or
198 * target buffers of a request via PCI DMA. The lower layers of the
199 * kernel provide the necessary cache management so that we can
200 * operate in a portable fashion
201 */
202
203int ide_build_sglist(ide_drive_t *drive, struct request *rq)
204{
205 ide_hwif_t *hwif = HWIF(drive);
206 struct scatterlist *sg = hwif->sg_table;
207
Jens Axboe4aff5e22006-08-10 08:44:47 +0200208 BUG_ON((rq->cmd_type == REQ_TYPE_ATA_TASKFILE) && rq->nr_sectors > 256);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
210 ide_map_sg(drive, rq);
211
212 if (rq_data_dir(rq) == READ)
213 hwif->sg_dma_direction = PCI_DMA_FROMDEVICE;
214 else
215 hwif->sg_dma_direction = PCI_DMA_TODEVICE;
216
217 return pci_map_sg(hwif->pci_dev, sg, hwif->sg_nents, hwif->sg_dma_direction);
218}
219
220EXPORT_SYMBOL_GPL(ide_build_sglist);
221
222/**
223 * ide_build_dmatable - build IDE DMA table
224 *
225 * ide_build_dmatable() prepares a dma request. We map the command
226 * to get the pci bus addresses of the buffers and then build up
227 * the PRD table that the IDE layer wants to be fed. The code
228 * knows about the 64K wrap bug in the CS5530.
229 *
230 * Returns the number of built PRD entries if all went okay,
231 * returns 0 otherwise.
232 *
233 * May also be invoked from trm290.c
234 */
235
236int ide_build_dmatable (ide_drive_t *drive, struct request *rq)
237{
238 ide_hwif_t *hwif = HWIF(drive);
239 unsigned int *table = hwif->dmatable_cpu;
240 unsigned int is_trm290 = (hwif->chipset == ide_trm290) ? 1 : 0;
241 unsigned int count = 0;
242 int i;
243 struct scatterlist *sg;
244
245 hwif->sg_nents = i = ide_build_sglist(drive, rq);
246
247 if (!i)
248 return 0;
249
250 sg = hwif->sg_table;
251 while (i) {
252 u32 cur_addr;
253 u32 cur_len;
254
255 cur_addr = sg_dma_address(sg);
256 cur_len = sg_dma_len(sg);
257
258 /*
259 * Fill in the dma table, without crossing any 64kB boundaries.
260 * Most hardware requires 16-bit alignment of all blocks,
261 * but the trm290 requires 32-bit alignment.
262 */
263
264 while (cur_len) {
265 if (count++ >= PRD_ENTRIES) {
266 printk(KERN_ERR "%s: DMA table too small\n", drive->name);
267 goto use_pio_instead;
268 } else {
269 u32 xcount, bcount = 0x10000 - (cur_addr & 0xffff);
270
271 if (bcount > cur_len)
272 bcount = cur_len;
273 *table++ = cpu_to_le32(cur_addr);
274 xcount = bcount & 0xffff;
275 if (is_trm290)
276 xcount = ((xcount >> 2) - 1) << 16;
277 if (xcount == 0x0000) {
278 /*
279 * Most chipsets correctly interpret a length of 0x0000 as 64KB,
280 * but at least one (e.g. CS5530) misinterprets it as zero (!).
281 * So here we break the 64KB entry into two 32KB entries instead.
282 */
283 if (count++ >= PRD_ENTRIES) {
284 printk(KERN_ERR "%s: DMA table too small\n", drive->name);
285 goto use_pio_instead;
286 }
287 *table++ = cpu_to_le32(0x8000);
288 *table++ = cpu_to_le32(cur_addr + 0x8000);
289 xcount = 0x8000;
290 }
291 *table++ = cpu_to_le32(xcount);
292 cur_addr += bcount;
293 cur_len -= bcount;
294 }
295 }
296
297 sg++;
298 i--;
299 }
300
301 if (count) {
302 if (!is_trm290)
303 *--table |= cpu_to_le32(0x80000000);
304 return count;
305 }
306 printk(KERN_ERR "%s: empty DMA table?\n", drive->name);
307use_pio_instead:
308 pci_unmap_sg(hwif->pci_dev,
309 hwif->sg_table,
310 hwif->sg_nents,
311 hwif->sg_dma_direction);
312 return 0; /* revert to PIO for this request */
313}
314
315EXPORT_SYMBOL_GPL(ide_build_dmatable);
316
317/**
318 * ide_destroy_dmatable - clean up DMA mapping
319 * @drive: The drive to unmap
320 *
321 * Teardown mappings after DMA has completed. This must be called
322 * after the completion of each use of ide_build_dmatable and before
323 * the next use of ide_build_dmatable. Failure to do so will cause
324 * an oops as only one mapping can be live for each target at a given
325 * time.
326 */
327
328void ide_destroy_dmatable (ide_drive_t *drive)
329{
330 struct pci_dev *dev = HWIF(drive)->pci_dev;
331 struct scatterlist *sg = HWIF(drive)->sg_table;
332 int nents = HWIF(drive)->sg_nents;
333
334 pci_unmap_sg(dev, sg, nents, HWIF(drive)->sg_dma_direction);
335}
336
337EXPORT_SYMBOL_GPL(ide_destroy_dmatable);
338
339/**
340 * config_drive_for_dma - attempt to activate IDE DMA
341 * @drive: the drive to place in DMA mode
342 *
343 * If the drive supports at least mode 2 DMA or UDMA of any kind
344 * then attempt to place it into DMA mode. Drives that are known to
345 * support DMA but predate the DMA properties or that are known
346 * to have DMA handling bugs are also set up appropriately based
347 * on the good/bad drive lists.
348 */
349
350static int config_drive_for_dma (ide_drive_t *drive)
351{
352 struct hd_driveid *id = drive->id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100354 if ((id->capability & 1) && drive->hwif->autodma) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 /*
356 * Enable DMA on any drive that has
357 * UltraDMA (mode 0/1/2/3/4/5/6) enabled
358 */
359 if ((id->field_valid & 4) && ((id->dma_ultra >> 8) & 0x7f))
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100360 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 /*
362 * Enable DMA on any drive that has mode2 DMA
363 * (multi or single) enabled
364 */
365 if (id->field_valid & 2) /* regular DMA */
366 if ((id->dma_mword & 0x404) == 0x404 ||
367 (id->dma_1word & 0x404) == 0x404)
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100368 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369
370 /* Consult the list of known "good" drives */
371 if (__ide_dma_good_drive(drive))
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100372 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 }
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100374
375 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376}
377
378/**
379 * dma_timer_expiry - handle a DMA timeout
380 * @drive: Drive that timed out
381 *
382 * An IDE DMA transfer timed out. In the event of an error we ask
383 * the driver to resolve the problem, if a DMA transfer is still
384 * in progress we continue to wait (arguably we need to add a
385 * secondary 'I don't care what the drive thinks' timeout here)
386 * Finally if we have an interrupt we let it complete the I/O.
387 * But only one time - we clear expiry and if it's still not
388 * completed after WAIT_CMD, we error and retry in PIO.
389 * This can occur if an interrupt is lost or due to hang or bugs.
390 */
391
392static int dma_timer_expiry (ide_drive_t *drive)
393{
394 ide_hwif_t *hwif = HWIF(drive);
395 u8 dma_stat = hwif->INB(hwif->dma_status);
396
397 printk(KERN_WARNING "%s: dma_timer_expiry: dma status == 0x%02x\n",
398 drive->name, dma_stat);
399
400 if ((dma_stat & 0x18) == 0x18) /* BUSY Stupid Early Timer !! */
401 return WAIT_CMD;
402
403 HWGROUP(drive)->expiry = NULL; /* one free ride for now */
404
405 /* 1 dmaing, 2 error, 4 intr */
406 if (dma_stat & 2) /* ERROR */
407 return -1;
408
409 if (dma_stat & 1) /* DMAing */
410 return WAIT_CMD;
411
412 if (dma_stat & 4) /* Got an Interrupt */
413 return WAIT_CMD;
414
415 return 0; /* Status is unknown -- reset the bus */
416}
417
418/**
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100419 * ide_dma_host_off - Generic DMA kill
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 * @drive: drive to control
421 *
422 * Perform the generic IDE controller DMA off operation. This
423 * works for most IDE bus mastering controllers
424 */
425
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100426void ide_dma_host_off(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427{
428 ide_hwif_t *hwif = HWIF(drive);
429 u8 unit = (drive->select.b.unit & 0x01);
430 u8 dma_stat = hwif->INB(hwif->dma_status);
431
432 hwif->OUTB((dma_stat & ~(1<<(5+unit))), hwif->dma_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433}
434
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100435EXPORT_SYMBOL(ide_dma_host_off);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436
437/**
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100438 * ide_dma_off_quietly - Generic DMA kill
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 * @drive: drive to control
440 *
441 * Turn off the current DMA on this IDE controller.
442 */
443
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100444void ide_dma_off_quietly(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445{
446 drive->using_dma = 0;
447 ide_toggle_bounce(drive, 0);
448
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100449 drive->hwif->dma_host_off(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450}
451
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100452EXPORT_SYMBOL(ide_dma_off_quietly);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
454
455/**
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100456 * ide_dma_off - disable DMA on a device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 * @drive: drive to disable DMA on
458 *
459 * Disable IDE DMA for a device on this IDE controller.
460 * Inform the user that DMA has been disabled.
461 */
462
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100463void ide_dma_off(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464{
465 printk(KERN_INFO "%s: DMA disabled\n", drive->name);
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100466 drive->hwif->dma_off_quietly(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467}
468
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100469EXPORT_SYMBOL(ide_dma_off);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470
471#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
472/**
Bartlomiej Zolnierkiewiczccf35282007-02-17 02:40:26 +0100473 * ide_dma_host_on - Enable DMA on a host
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 * @drive: drive to enable for DMA
475 *
476 * Enable DMA on an IDE controller following generic bus mastering
477 * IDE controller behaviour
478 */
Bartlomiej Zolnierkiewiczccf35282007-02-17 02:40:26 +0100479
480void ide_dma_host_on(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481{
482 if (drive->using_dma) {
483 ide_hwif_t *hwif = HWIF(drive);
484 u8 unit = (drive->select.b.unit & 0x01);
485 u8 dma_stat = hwif->INB(hwif->dma_status);
486
487 hwif->OUTB((dma_stat|(1<<(5+unit))), hwif->dma_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489}
490
Bartlomiej Zolnierkiewiczccf35282007-02-17 02:40:26 +0100491EXPORT_SYMBOL(ide_dma_host_on);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492
493/**
494 * __ide_dma_on - Enable DMA on a device
495 * @drive: drive to enable DMA on
496 *
497 * Enable IDE DMA for a device on this IDE controller.
498 */
499
500int __ide_dma_on (ide_drive_t *drive)
501{
502 /* consult the list of known "bad" drives */
503 if (__ide_dma_bad_drive(drive))
504 return 1;
505
506 drive->using_dma = 1;
507 ide_toggle_bounce(drive, 1);
508
Bartlomiej Zolnierkiewiczccf35282007-02-17 02:40:26 +0100509 drive->hwif->dma_host_on(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510
511 return 0;
512}
513
514EXPORT_SYMBOL(__ide_dma_on);
515
516/**
517 * __ide_dma_check - check DMA setup
518 * @drive: drive to check
519 *
520 * Don't use - due for extermination
521 */
522
523int __ide_dma_check (ide_drive_t *drive)
524{
525 return config_drive_for_dma(drive);
526}
527
528EXPORT_SYMBOL(__ide_dma_check);
529
530/**
531 * ide_dma_setup - begin a DMA phase
532 * @drive: target device
533 *
534 * Build an IDE DMA PRD (IDE speak for scatter gather table)
535 * and then set up the DMA transfer registers for a device
536 * that follows generic IDE PCI DMA behaviour. Controllers can
537 * override this function if they need to
538 *
539 * Returns 0 on success. If a PIO fallback is required then 1
540 * is returned.
541 */
542
543int ide_dma_setup(ide_drive_t *drive)
544{
545 ide_hwif_t *hwif = drive->hwif;
546 struct request *rq = HWGROUP(drive)->rq;
547 unsigned int reading;
548 u8 dma_stat;
549
550 if (rq_data_dir(rq))
551 reading = 0;
552 else
553 reading = 1 << 3;
554
555 /* fall back to pio! */
556 if (!ide_build_dmatable(drive, rq)) {
557 ide_map_sg(drive, rq);
558 return 1;
559 }
560
561 /* PRD table */
Bartlomiej Zolnierkiewicz2ad1e552007-02-17 02:40:25 +0100562 if (hwif->mmio)
Bartlomiej Zolnierkiewicz0ecdca22007-02-17 02:40:25 +0100563 writel(hwif->dmatable_dma, (void __iomem *)hwif->dma_prdtable);
564 else
565 outl(hwif->dmatable_dma, hwif->dma_prdtable);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
567 /* specify r/w */
568 hwif->OUTB(reading, hwif->dma_command);
569
570 /* read dma_status for INTR & ERROR flags */
571 dma_stat = hwif->INB(hwif->dma_status);
572
573 /* clear INTR & ERROR flags */
574 hwif->OUTB(dma_stat|6, hwif->dma_status);
575 drive->waiting_for_dma = 1;
576 return 0;
577}
578
579EXPORT_SYMBOL_GPL(ide_dma_setup);
580
581static void ide_dma_exec_cmd(ide_drive_t *drive, u8 command)
582{
583 /* issue cmd to drive */
584 ide_execute_command(drive, command, &ide_dma_intr, 2*WAIT_CMD, dma_timer_expiry);
585}
586
587void ide_dma_start(ide_drive_t *drive)
588{
589 ide_hwif_t *hwif = HWIF(drive);
590 u8 dma_cmd = hwif->INB(hwif->dma_command);
591
592 /* Note that this is done *after* the cmd has
593 * been issued to the drive, as per the BM-IDE spec.
594 * The Promise Ultra33 doesn't work correctly when
595 * we do this part before issuing the drive cmd.
596 */
597 /* start DMA */
598 hwif->OUTB(dma_cmd|1, hwif->dma_command);
599 hwif->dma = 1;
600 wmb();
601}
602
603EXPORT_SYMBOL_GPL(ide_dma_start);
604
605/* returns 1 on error, 0 otherwise */
606int __ide_dma_end (ide_drive_t *drive)
607{
608 ide_hwif_t *hwif = HWIF(drive);
609 u8 dma_stat = 0, dma_cmd = 0;
610
611 drive->waiting_for_dma = 0;
612 /* get dma_command mode */
613 dma_cmd = hwif->INB(hwif->dma_command);
614 /* stop DMA */
615 hwif->OUTB(dma_cmd&~1, hwif->dma_command);
616 /* get DMA status */
617 dma_stat = hwif->INB(hwif->dma_status);
618 /* clear the INTR & ERROR bits */
619 hwif->OUTB(dma_stat|6, hwif->dma_status);
620 /* purge DMA mappings */
621 ide_destroy_dmatable(drive);
622 /* verify good DMA status */
623 hwif->dma = 0;
624 wmb();
625 return (dma_stat & 7) != 4 ? (0x10 | dma_stat) : 0;
626}
627
628EXPORT_SYMBOL(__ide_dma_end);
629
630/* returns 1 if dma irq issued, 0 otherwise */
631static int __ide_dma_test_irq(ide_drive_t *drive)
632{
633 ide_hwif_t *hwif = HWIF(drive);
634 u8 dma_stat = hwif->INB(hwif->dma_status);
635
636#if 0 /* do not set unless you know what you are doing */
637 if (dma_stat & 4) {
638 u8 stat = hwif->INB(IDE_STATUS_REG);
639 hwif->OUTB(hwif->dma_status, dma_stat & 0xE4);
640 }
641#endif
642 /* return 1 if INTR asserted */
643 if ((dma_stat & 4) == 4)
644 return 1;
645 if (!drive->waiting_for_dma)
646 printk(KERN_WARNING "%s: (%s) called while not waiting\n",
647 drive->name, __FUNCTION__);
648 return 0;
649}
650#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
651
652int __ide_dma_bad_drive (ide_drive_t *drive)
653{
654 struct hd_driveid *id = drive->id;
655
Jordan Crouse65e5f2e2005-12-15 02:16:18 +0100656 int blacklist = ide_in_drive_list(id, drive_blacklist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 if (blacklist) {
658 printk(KERN_WARNING "%s: Disabling (U)DMA for %s (blacklisted)\n",
659 drive->name, id->model);
660 return blacklist;
661 }
662 return 0;
663}
664
665EXPORT_SYMBOL(__ide_dma_bad_drive);
666
667int __ide_dma_good_drive (ide_drive_t *drive)
668{
669 struct hd_driveid *id = drive->id;
Jordan Crouse65e5f2e2005-12-15 02:16:18 +0100670 return ide_in_drive_list(id, drive_whitelist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671}
672
673EXPORT_SYMBOL(__ide_dma_good_drive);
674
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200675static const u8 xfer_mode_bases[] = {
676 XFER_UDMA_0,
677 XFER_MW_DMA_0,
678 XFER_SW_DMA_0,
679};
680
681static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base)
682{
683 struct hd_driveid *id = drive->id;
684 ide_hwif_t *hwif = drive->hwif;
685 unsigned int mask = 0;
686
687 switch(base) {
688 case XFER_UDMA_0:
689 if ((id->field_valid & 4) == 0)
690 break;
691
692 mask = id->dma_ultra & hwif->ultra_mask;
693
694 if (hwif->udma_filter)
695 mask &= hwif->udma_filter(drive);
696
697 if ((mask & 0x78) && (eighty_ninty_three(drive) == 0))
698 mask &= 0x07;
699 break;
700 case XFER_MW_DMA_0:
Bartlomiej Zolnierkiewicz3649c062007-05-16 00:51:46 +0200701 if (id->field_valid & 2)
702 mask = id->dma_mword & hwif->mwdma_mask;
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200703 break;
704 case XFER_SW_DMA_0:
Bartlomiej Zolnierkiewicz3649c062007-05-16 00:51:46 +0200705 if (id->field_valid & 2)
706 mask = id->dma_1word & hwif->swdma_mask;
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200707 break;
708 default:
709 BUG();
710 break;
711 }
712
713 return mask;
714}
715
716/**
717 * ide_max_dma_mode - compute DMA speed
718 * @drive: IDE device
719 *
720 * Checks the drive capabilities and returns the speed to use
721 * for the DMA transfer. Returns 0 if the drive is incapable
722 * of DMA transfers.
723 */
724
725u8 ide_max_dma_mode(ide_drive_t *drive)
726{
727 ide_hwif_t *hwif = drive->hwif;
728 unsigned int mask;
729 int x, i;
730 u8 mode = 0;
731
732 if (drive->media != ide_disk && hwif->atapi_dma == 0)
733 return 0;
734
735 for (i = 0; i < ARRAY_SIZE(xfer_mode_bases); i++) {
736 mask = ide_get_mode_mask(drive, xfer_mode_bases[i]);
737 x = fls(mask) - 1;
738 if (x >= 0) {
739 mode = xfer_mode_bases[i] + x;
740 break;
741 }
742 }
743
744 printk(KERN_DEBUG "%s: selected mode 0x%x\n", drive->name, mode);
745
746 return mode;
747}
748
749EXPORT_SYMBOL_GPL(ide_max_dma_mode);
750
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200751int ide_tune_dma(ide_drive_t *drive)
752{
753 u8 speed;
754
Bartlomiej Zolnierkiewicz122ab082007-05-16 00:51:46 +0200755 if ((drive->id->capability & 1) == 0 || drive->autodma == 0)
756 return 0;
757
758 /* consult the list of known "bad" drives */
759 if (__ide_dma_bad_drive(drive))
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200760 return 0;
761
762 speed = ide_max_dma_mode(drive);
763
764 if (!speed)
765 return 0;
766
Bartlomiej Zolnierkiewicz4728d542007-05-16 00:51:46 +0200767 if (drive->hwif->speedproc(drive, speed))
768 return 0;
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200769
Bartlomiej Zolnierkiewicz4728d542007-05-16 00:51:46 +0200770 return 1;
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200771}
772
773EXPORT_SYMBOL_GPL(ide_tune_dma);
774
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775void ide_dma_verbose(ide_drive_t *drive)
776{
777 struct hd_driveid *id = drive->id;
778 ide_hwif_t *hwif = HWIF(drive);
779
780 if (id->field_valid & 4) {
781 if ((id->dma_ultra >> 8) && (id->dma_mword >> 8))
782 goto bug_dma_off;
783 if (id->dma_ultra & ((id->dma_ultra >> 8) & hwif->ultra_mask)) {
784 if (((id->dma_ultra >> 11) & 0x1F) &&
785 eighty_ninty_three(drive)) {
786 if ((id->dma_ultra >> 15) & 1) {
787 printk(", UDMA(mode 7)");
788 } else if ((id->dma_ultra >> 14) & 1) {
789 printk(", UDMA(133)");
790 } else if ((id->dma_ultra >> 13) & 1) {
791 printk(", UDMA(100)");
792 } else if ((id->dma_ultra >> 12) & 1) {
793 printk(", UDMA(66)");
794 } else if ((id->dma_ultra >> 11) & 1) {
795 printk(", UDMA(44)");
796 } else
797 goto mode_two;
798 } else {
799 mode_two:
800 if ((id->dma_ultra >> 10) & 1) {
801 printk(", UDMA(33)");
802 } else if ((id->dma_ultra >> 9) & 1) {
803 printk(", UDMA(25)");
804 } else if ((id->dma_ultra >> 8) & 1) {
805 printk(", UDMA(16)");
806 }
807 }
808 } else {
809 printk(", (U)DMA"); /* Can be BIOS-enabled! */
810 }
811 } else if (id->field_valid & 2) {
812 if ((id->dma_mword >> 8) && (id->dma_1word >> 8))
813 goto bug_dma_off;
814 printk(", DMA");
815 } else if (id->field_valid & 1) {
Jens Axboe0a8348d2006-07-28 08:58:26 +0200816 goto bug_dma_off;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 }
818 return;
819bug_dma_off:
820 printk(", BUG DMA OFF");
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100821 hwif->dma_off_quietly(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 return;
823}
824
825EXPORT_SYMBOL(ide_dma_verbose);
826
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100827int ide_set_dma(ide_drive_t *drive)
828{
829 ide_hwif_t *hwif = drive->hwif;
830 int rc;
831
832 rc = hwif->ide_dma_check(drive);
833
834 switch(rc) {
835 case -1: /* DMA needs to be disabled */
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100836 hwif->dma_off_quietly(drive);
Bartlomiej Zolnierkiewicz6f5050a2007-03-17 21:57:39 +0100837 return -1;
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100838 case 0: /* DMA needs to be enabled */
839 return hwif->ide_dma_on(drive);
840 case 1: /* DMA setting cannot be changed */
841 break;
842 default:
843 BUG();
844 break;
845 }
846
847 return rc;
848}
849
850EXPORT_SYMBOL_GPL(ide_set_dma);
851
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
Sergei Shtylyov841d2a92007-07-09 23:17:54 +0200853void ide_dma_lost_irq (ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854{
855 printk("%s: DMA interrupt recovery\n", drive->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856}
857
Sergei Shtylyov841d2a92007-07-09 23:17:54 +0200858EXPORT_SYMBOL(ide_dma_lost_irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859
860int __ide_dma_timeout (ide_drive_t *drive)
861{
862 printk(KERN_ERR "%s: timeout waiting for DMA\n", drive->name);
863 if (HWIF(drive)->ide_dma_test_irq(drive))
864 return 0;
865
866 return HWIF(drive)->ide_dma_end(drive);
867}
868
869EXPORT_SYMBOL(__ide_dma_timeout);
870
871/*
872 * Needed for allowing full modular support of ide-driver
873 */
874static int ide_release_dma_engine(ide_hwif_t *hwif)
875{
876 if (hwif->dmatable_cpu) {
877 pci_free_consistent(hwif->pci_dev,
878 PRD_ENTRIES * PRD_BYTES,
879 hwif->dmatable_cpu,
880 hwif->dmatable_dma);
881 hwif->dmatable_cpu = NULL;
882 }
883 return 1;
884}
885
886static int ide_release_iomio_dma(ide_hwif_t *hwif)
887{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 release_region(hwif->dma_base, 8);
Sergei Shtylylov020e3222006-10-03 01:14:13 -0700889 if (hwif->extra_ports)
890 release_region(hwif->extra_base, hwif->extra_ports);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 return 1;
892}
893
894/*
895 * Needed for allowing full modular support of ide-driver
896 */
Sergei Shtylylovdc844e02006-10-03 01:14:14 -0700897int ide_release_dma(ide_hwif_t *hwif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898{
Sergei Shtylylovdc844e02006-10-03 01:14:14 -0700899 ide_release_dma_engine(hwif);
900
Bartlomiej Zolnierkiewicz2ad1e552007-02-17 02:40:25 +0100901 if (hwif->mmio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 return 1;
Sergei Shtylylovdc844e02006-10-03 01:14:14 -0700903 else
904 return ide_release_iomio_dma(hwif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905}
906
907static int ide_allocate_dma_engine(ide_hwif_t *hwif)
908{
909 hwif->dmatable_cpu = pci_alloc_consistent(hwif->pci_dev,
910 PRD_ENTRIES * PRD_BYTES,
911 &hwif->dmatable_dma);
912
913 if (hwif->dmatable_cpu)
914 return 0;
915
Sergei Shtylylovdc844e02006-10-03 01:14:14 -0700916 printk(KERN_ERR "%s: -- Error, unable to allocate DMA table.\n",
917 hwif->cds->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 return 1;
920}
921
922static int ide_mapped_mmio_dma(ide_hwif_t *hwif, unsigned long base, unsigned int ports)
923{
924 printk(KERN_INFO " %s: MMIO-DMA ", hwif->name);
925
Sergei Shtylylov020e3222006-10-03 01:14:13 -0700926 hwif->dma_base = base;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927
928 if(hwif->mate)
929 hwif->dma_master = (hwif->channel) ? hwif->mate->dma_base : base;
930 else
931 hwif->dma_master = base;
932 return 0;
933}
934
935static int ide_iomio_dma(ide_hwif_t *hwif, unsigned long base, unsigned int ports)
936{
937 printk(KERN_INFO " %s: BM-DMA at 0x%04lx-0x%04lx",
Sergei Shtylylov020e3222006-10-03 01:14:13 -0700938 hwif->name, base, base + ports - 1);
939
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 if (!request_region(base, ports, hwif->name)) {
941 printk(" -- Error, ports in use.\n");
942 return 1;
943 }
Sergei Shtylylov020e3222006-10-03 01:14:13 -0700944
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 hwif->dma_base = base;
Sergei Shtylylov020e3222006-10-03 01:14:13 -0700946
947 if (hwif->cds->extra) {
948 hwif->extra_base = base + (hwif->channel ? 8 : 16);
949
950 if (!hwif->mate || !hwif->mate->extra_ports) {
951 if (!request_region(hwif->extra_base,
952 hwif->cds->extra, hwif->cds->name)) {
953 printk(" -- Error, extra ports in use.\n");
954 release_region(base, ports);
955 return 1;
956 }
957 hwif->extra_ports = hwif->cds->extra;
958 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 }
Sergei Shtylylov020e3222006-10-03 01:14:13 -0700960
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 if(hwif->mate)
Sergei Shtylyov3f63c5e2006-10-03 01:14:25 -0700962 hwif->dma_master = (hwif->channel) ? hwif->mate->dma_base:base;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 else
964 hwif->dma_master = base;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 return 0;
966}
967
968static int ide_dma_iobase(ide_hwif_t *hwif, unsigned long base, unsigned int ports)
969{
Bartlomiej Zolnierkiewicz2ad1e552007-02-17 02:40:25 +0100970 if (hwif->mmio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 return ide_mapped_mmio_dma(hwif, base,ports);
Bartlomiej Zolnierkiewicz2ad1e552007-02-17 02:40:25 +0100972
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 return ide_iomio_dma(hwif, base, ports);
974}
975
976/*
977 * This can be called for a dynamically installed interface. Don't __init it
978 */
979void ide_setup_dma (ide_hwif_t *hwif, unsigned long dma_base, unsigned int num_ports)
980{
981 if (ide_dma_iobase(hwif, dma_base, num_ports))
982 return;
983
984 if (ide_allocate_dma_engine(hwif)) {
985 ide_release_dma(hwif);
986 return;
987 }
988
989 if (!(hwif->dma_command))
990 hwif->dma_command = hwif->dma_base;
991 if (!(hwif->dma_vendor1))
992 hwif->dma_vendor1 = (hwif->dma_base + 1);
993 if (!(hwif->dma_status))
994 hwif->dma_status = (hwif->dma_base + 2);
995 if (!(hwif->dma_vendor3))
996 hwif->dma_vendor3 = (hwif->dma_base + 3);
997 if (!(hwif->dma_prdtable))
998 hwif->dma_prdtable = (hwif->dma_base + 4);
999
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +01001000 if (!hwif->dma_off_quietly)
1001 hwif->dma_off_quietly = &ide_dma_off_quietly;
1002 if (!hwif->dma_host_off)
1003 hwif->dma_host_off = &ide_dma_host_off;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004 if (!hwif->ide_dma_on)
1005 hwif->ide_dma_on = &__ide_dma_on;
Bartlomiej Zolnierkiewiczccf35282007-02-17 02:40:26 +01001006 if (!hwif->dma_host_on)
1007 hwif->dma_host_on = &ide_dma_host_on;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 if (!hwif->ide_dma_check)
1009 hwif->ide_dma_check = &__ide_dma_check;
1010 if (!hwif->dma_setup)
1011 hwif->dma_setup = &ide_dma_setup;
1012 if (!hwif->dma_exec_cmd)
1013 hwif->dma_exec_cmd = &ide_dma_exec_cmd;
1014 if (!hwif->dma_start)
1015 hwif->dma_start = &ide_dma_start;
1016 if (!hwif->ide_dma_end)
1017 hwif->ide_dma_end = &__ide_dma_end;
1018 if (!hwif->ide_dma_test_irq)
1019 hwif->ide_dma_test_irq = &__ide_dma_test_irq;
1020 if (!hwif->ide_dma_timeout)
1021 hwif->ide_dma_timeout = &__ide_dma_timeout;
Sergei Shtylyov841d2a92007-07-09 23:17:54 +02001022 if (!hwif->dma_lost_irq)
1023 hwif->dma_lost_irq = &ide_dma_lost_irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024
1025 if (hwif->chipset != ide_trm290) {
1026 u8 dma_stat = hwif->INB(hwif->dma_status);
1027 printk(", BIOS settings: %s:%s, %s:%s",
1028 hwif->drives[0].name, (dma_stat & 0x20) ? "DMA" : "pio",
1029 hwif->drives[1].name, (dma_stat & 0x40) ? "DMA" : "pio");
1030 }
1031 printk("\n");
1032
Eric Sesterhenn125e1872006-06-23 02:06:06 -07001033 BUG_ON(!hwif->dma_master);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034}
1035
1036EXPORT_SYMBOL_GPL(ide_setup_dma);
1037#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */