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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
Junio C Hamanoc2d3ce82007-07-09 23:17:56 +020094 { "Micropolis 2112A" , NULL },
95 { "CONNER CTMA 4000" , NULL },
96 { "CONNER CTT8000-A" , NULL },
97 { "ST34342A" , NULL },
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 { NULL , NULL }
99};
100
101static const struct drive_list_entry drive_blacklist [] = {
102
Junio C Hamanoc2d3ce82007-07-09 23:17:56 +0200103 { "WDC AC11000H" , NULL },
104 { "WDC AC22100H" , NULL },
105 { "WDC AC32500H" , NULL },
106 { "WDC AC33100H" , NULL },
107 { "WDC AC31600H" , NULL },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 { "WDC AC32100H" , "24.09P07" },
109 { "WDC AC23200L" , "21.10N21" },
Junio C Hamanoc2d3ce82007-07-09 23:17:56 +0200110 { "Compaq CRD-8241B" , NULL },
111 { "CRD-8400B" , NULL },
112 { "CRD-8480B", NULL },
113 { "CRD-8482B", NULL },
114 { "CRD-84" , NULL },
115 { "SanDisk SDP3B" , NULL },
116 { "SanDisk SDP3B-64" , NULL },
117 { "SANYO CD-ROM CRD" , NULL },
118 { "HITACHI CDR-8" , NULL },
119 { "HITACHI CDR-8335" , NULL },
120 { "HITACHI CDR-8435" , NULL },
121 { "Toshiba CD-ROM XM-6202B" , NULL },
122 { "TOSHIBA CD-ROM XM-1702BC", NULL },
123 { "CD-532E-A" , NULL },
124 { "E-IDE CD-ROM CR-840", NULL },
125 { "CD-ROM Drive/F5A", NULL },
126 { "WPI CDD-820", NULL },
127 { "SAMSUNG CD-ROM SC-148C", NULL },
128 { "SAMSUNG CD-ROM SC", NULL },
129 { "ATAPI CD-ROM DRIVE 40X MAXIMUM", NULL },
130 { "_NEC DV5800A", NULL },
Junio C Hamano5a6248c2007-05-24 02:42:38 +0200131 { "SAMSUNG CD-ROM SN-124", "N001" },
Junio C Hamanoc2d3ce82007-07-09 23:17:56 +0200132 { "Seagate STT20000A", NULL },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 { NULL , NULL }
134
135};
136
137/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 * ide_dma_intr - IDE DMA interrupt handler
139 * @drive: the drive the interrupt is for
140 *
141 * Handle an interrupt completing a read/write DMA transfer on an
142 * IDE device
143 */
144
145ide_startstop_t ide_dma_intr (ide_drive_t *drive)
146{
147 u8 stat = 0, dma_stat = 0;
148
149 dma_stat = HWIF(drive)->ide_dma_end(drive);
150 stat = HWIF(drive)->INB(IDE_STATUS_REG); /* get drive status */
151 if (OK_STAT(stat,DRIVE_READY,drive->bad_wstat|DRQ_STAT)) {
152 if (!dma_stat) {
153 struct request *rq = HWGROUP(drive)->rq;
154
155 if (rq->rq_disk) {
156 ide_driver_t *drv;
157
Alexey Dobriyan53b35312006-03-24 03:16:13 -0800158 drv = *(ide_driver_t **)rq->rq_disk->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 drv->end_request(drive, 1, rq->nr_sectors);
160 } else
161 ide_end_request(drive, 1, rq->nr_sectors);
162 return ide_stopped;
163 }
164 printk(KERN_ERR "%s: dma_intr: bad DMA status (dma_stat=%x)\n",
165 drive->name, dma_stat);
166 }
167 return ide_error(drive, "dma_intr", stat);
168}
169
170EXPORT_SYMBOL_GPL(ide_dma_intr);
171
172#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
173/**
174 * ide_build_sglist - map IDE scatter gather for DMA I/O
175 * @drive: the drive to build the DMA table for
176 * @rq: the request holding the sg list
177 *
178 * Perform the PCI mapping magic necessary to access the source or
179 * target buffers of a request via PCI DMA. The lower layers of the
180 * kernel provide the necessary cache management so that we can
181 * operate in a portable fashion
182 */
183
184int ide_build_sglist(ide_drive_t *drive, struct request *rq)
185{
186 ide_hwif_t *hwif = HWIF(drive);
187 struct scatterlist *sg = hwif->sg_table;
188
Jens Axboe4aff5e22006-08-10 08:44:47 +0200189 BUG_ON((rq->cmd_type == REQ_TYPE_ATA_TASKFILE) && rq->nr_sectors > 256);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
191 ide_map_sg(drive, rq);
192
193 if (rq_data_dir(rq) == READ)
194 hwif->sg_dma_direction = PCI_DMA_FROMDEVICE;
195 else
196 hwif->sg_dma_direction = PCI_DMA_TODEVICE;
197
198 return pci_map_sg(hwif->pci_dev, sg, hwif->sg_nents, hwif->sg_dma_direction);
199}
200
201EXPORT_SYMBOL_GPL(ide_build_sglist);
202
203/**
204 * ide_build_dmatable - build IDE DMA table
205 *
206 * ide_build_dmatable() prepares a dma request. We map the command
207 * to get the pci bus addresses of the buffers and then build up
208 * the PRD table that the IDE layer wants to be fed. The code
209 * knows about the 64K wrap bug in the CS5530.
210 *
211 * Returns the number of built PRD entries if all went okay,
212 * returns 0 otherwise.
213 *
214 * May also be invoked from trm290.c
215 */
216
217int ide_build_dmatable (ide_drive_t *drive, struct request *rq)
218{
219 ide_hwif_t *hwif = HWIF(drive);
220 unsigned int *table = hwif->dmatable_cpu;
221 unsigned int is_trm290 = (hwif->chipset == ide_trm290) ? 1 : 0;
222 unsigned int count = 0;
223 int i;
224 struct scatterlist *sg;
225
226 hwif->sg_nents = i = ide_build_sglist(drive, rq);
227
228 if (!i)
229 return 0;
230
231 sg = hwif->sg_table;
232 while (i) {
233 u32 cur_addr;
234 u32 cur_len;
235
236 cur_addr = sg_dma_address(sg);
237 cur_len = sg_dma_len(sg);
238
239 /*
240 * Fill in the dma table, without crossing any 64kB boundaries.
241 * Most hardware requires 16-bit alignment of all blocks,
242 * but the trm290 requires 32-bit alignment.
243 */
244
245 while (cur_len) {
246 if (count++ >= PRD_ENTRIES) {
247 printk(KERN_ERR "%s: DMA table too small\n", drive->name);
248 goto use_pio_instead;
249 } else {
250 u32 xcount, bcount = 0x10000 - (cur_addr & 0xffff);
251
252 if (bcount > cur_len)
253 bcount = cur_len;
254 *table++ = cpu_to_le32(cur_addr);
255 xcount = bcount & 0xffff;
256 if (is_trm290)
257 xcount = ((xcount >> 2) - 1) << 16;
258 if (xcount == 0x0000) {
259 /*
260 * Most chipsets correctly interpret a length of 0x0000 as 64KB,
261 * but at least one (e.g. CS5530) misinterprets it as zero (!).
262 * So here we break the 64KB entry into two 32KB entries instead.
263 */
264 if (count++ >= PRD_ENTRIES) {
265 printk(KERN_ERR "%s: DMA table too small\n", drive->name);
266 goto use_pio_instead;
267 }
268 *table++ = cpu_to_le32(0x8000);
269 *table++ = cpu_to_le32(cur_addr + 0x8000);
270 xcount = 0x8000;
271 }
272 *table++ = cpu_to_le32(xcount);
273 cur_addr += bcount;
274 cur_len -= bcount;
275 }
276 }
277
278 sg++;
279 i--;
280 }
281
282 if (count) {
283 if (!is_trm290)
284 *--table |= cpu_to_le32(0x80000000);
285 return count;
286 }
287 printk(KERN_ERR "%s: empty DMA table?\n", drive->name);
288use_pio_instead:
289 pci_unmap_sg(hwif->pci_dev,
290 hwif->sg_table,
291 hwif->sg_nents,
292 hwif->sg_dma_direction);
293 return 0; /* revert to PIO for this request */
294}
295
296EXPORT_SYMBOL_GPL(ide_build_dmatable);
297
298/**
299 * ide_destroy_dmatable - clean up DMA mapping
300 * @drive: The drive to unmap
301 *
302 * Teardown mappings after DMA has completed. This must be called
303 * after the completion of each use of ide_build_dmatable and before
304 * the next use of ide_build_dmatable. Failure to do so will cause
305 * an oops as only one mapping can be live for each target at a given
306 * time.
307 */
308
309void ide_destroy_dmatable (ide_drive_t *drive)
310{
311 struct pci_dev *dev = HWIF(drive)->pci_dev;
312 struct scatterlist *sg = HWIF(drive)->sg_table;
313 int nents = HWIF(drive)->sg_nents;
314
315 pci_unmap_sg(dev, sg, nents, HWIF(drive)->sg_dma_direction);
316}
317
318EXPORT_SYMBOL_GPL(ide_destroy_dmatable);
319
320/**
321 * config_drive_for_dma - attempt to activate IDE DMA
322 * @drive: the drive to place in DMA mode
323 *
324 * If the drive supports at least mode 2 DMA or UDMA of any kind
325 * then attempt to place it into DMA mode. Drives that are known to
326 * support DMA but predate the DMA properties or that are known
327 * to have DMA handling bugs are also set up appropriately based
328 * on the good/bad drive lists.
329 */
330
331static int config_drive_for_dma (ide_drive_t *drive)
332{
Bartlomiej Zolnierkiewicz1116fae2007-08-20 22:42:55 +0200333 ide_hwif_t *hwif = drive->hwif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 struct hd_driveid *id = drive->id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
Bartlomiej Zolnierkiewicz1116fae2007-08-20 22:42:55 +0200336 /* consult the list of known "bad" drives */
337 if (__ide_dma_bad_drive(drive))
338 return -1;
339
340 if (drive->media != ide_disk && hwif->atapi_dma == 0)
341 return -1;
342
343 if ((id->capability & 1) && drive->autodma) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 /*
345 * Enable DMA on any drive that has
346 * UltraDMA (mode 0/1/2/3/4/5/6) enabled
347 */
348 if ((id->field_valid & 4) && ((id->dma_ultra >> 8) & 0x7f))
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100349 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 /*
351 * Enable DMA on any drive that has mode2 DMA
352 * (multi or single) enabled
353 */
354 if (id->field_valid & 2) /* regular DMA */
355 if ((id->dma_mword & 0x404) == 0x404 ||
356 (id->dma_1word & 0x404) == 0x404)
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100357 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
359 /* Consult the list of known "good" drives */
360 if (__ide_dma_good_drive(drive))
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100361 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 }
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100363
364 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365}
366
367/**
368 * dma_timer_expiry - handle a DMA timeout
369 * @drive: Drive that timed out
370 *
371 * An IDE DMA transfer timed out. In the event of an error we ask
372 * the driver to resolve the problem, if a DMA transfer is still
373 * in progress we continue to wait (arguably we need to add a
374 * secondary 'I don't care what the drive thinks' timeout here)
375 * Finally if we have an interrupt we let it complete the I/O.
376 * But only one time - we clear expiry and if it's still not
377 * completed after WAIT_CMD, we error and retry in PIO.
378 * This can occur if an interrupt is lost or due to hang or bugs.
379 */
380
381static int dma_timer_expiry (ide_drive_t *drive)
382{
383 ide_hwif_t *hwif = HWIF(drive);
384 u8 dma_stat = hwif->INB(hwif->dma_status);
385
386 printk(KERN_WARNING "%s: dma_timer_expiry: dma status == 0x%02x\n",
387 drive->name, dma_stat);
388
389 if ((dma_stat & 0x18) == 0x18) /* BUSY Stupid Early Timer !! */
390 return WAIT_CMD;
391
392 HWGROUP(drive)->expiry = NULL; /* one free ride for now */
393
394 /* 1 dmaing, 2 error, 4 intr */
395 if (dma_stat & 2) /* ERROR */
396 return -1;
397
398 if (dma_stat & 1) /* DMAing */
399 return WAIT_CMD;
400
401 if (dma_stat & 4) /* Got an Interrupt */
402 return WAIT_CMD;
403
404 return 0; /* Status is unknown -- reset the bus */
405}
406
407/**
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100408 * ide_dma_host_off - Generic DMA kill
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 * @drive: drive to control
410 *
411 * Perform the generic IDE controller DMA off operation. This
412 * works for most IDE bus mastering controllers
413 */
414
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100415void ide_dma_host_off(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416{
417 ide_hwif_t *hwif = HWIF(drive);
418 u8 unit = (drive->select.b.unit & 0x01);
419 u8 dma_stat = hwif->INB(hwif->dma_status);
420
421 hwif->OUTB((dma_stat & ~(1<<(5+unit))), hwif->dma_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422}
423
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100424EXPORT_SYMBOL(ide_dma_host_off);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
426/**
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100427 * ide_dma_off_quietly - Generic DMA kill
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 * @drive: drive to control
429 *
430 * Turn off the current DMA on this IDE controller.
431 */
432
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100433void ide_dma_off_quietly(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434{
435 drive->using_dma = 0;
436 ide_toggle_bounce(drive, 0);
437
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100438 drive->hwif->dma_host_off(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439}
440
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100441EXPORT_SYMBOL(ide_dma_off_quietly);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
443
444/**
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100445 * ide_dma_off - disable DMA on a device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 * @drive: drive to disable DMA on
447 *
448 * Disable IDE DMA for a device on this IDE controller.
449 * Inform the user that DMA has been disabled.
450 */
451
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100452void ide_dma_off(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453{
454 printk(KERN_INFO "%s: DMA disabled\n", drive->name);
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100455 drive->hwif->dma_off_quietly(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456}
457
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100458EXPORT_SYMBOL(ide_dma_off);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459
460#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
461/**
Bartlomiej Zolnierkiewiczccf35282007-02-17 02:40:26 +0100462 * ide_dma_host_on - Enable DMA on a host
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 * @drive: drive to enable for DMA
464 *
465 * Enable DMA on an IDE controller following generic bus mastering
466 * IDE controller behaviour
467 */
Bartlomiej Zolnierkiewiczccf35282007-02-17 02:40:26 +0100468
469void ide_dma_host_on(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470{
471 if (drive->using_dma) {
472 ide_hwif_t *hwif = HWIF(drive);
473 u8 unit = (drive->select.b.unit & 0x01);
474 u8 dma_stat = hwif->INB(hwif->dma_status);
475
476 hwif->OUTB((dma_stat|(1<<(5+unit))), hwif->dma_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478}
479
Bartlomiej Zolnierkiewiczccf35282007-02-17 02:40:26 +0100480EXPORT_SYMBOL(ide_dma_host_on);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481
482/**
483 * __ide_dma_on - Enable DMA on a device
484 * @drive: drive to enable DMA on
485 *
486 * Enable IDE DMA for a device on this IDE controller.
487 */
488
489int __ide_dma_on (ide_drive_t *drive)
490{
491 /* consult the list of known "bad" drives */
492 if (__ide_dma_bad_drive(drive))
493 return 1;
494
495 drive->using_dma = 1;
496 ide_toggle_bounce(drive, 1);
497
Bartlomiej Zolnierkiewiczccf35282007-02-17 02:40:26 +0100498 drive->hwif->dma_host_on(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
500 return 0;
501}
502
503EXPORT_SYMBOL(__ide_dma_on);
504
505/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 * ide_dma_setup - begin a DMA phase
507 * @drive: target device
508 *
509 * Build an IDE DMA PRD (IDE speak for scatter gather table)
510 * and then set up the DMA transfer registers for a device
511 * that follows generic IDE PCI DMA behaviour. Controllers can
512 * override this function if they need to
513 *
514 * Returns 0 on success. If a PIO fallback is required then 1
515 * is returned.
516 */
517
518int ide_dma_setup(ide_drive_t *drive)
519{
520 ide_hwif_t *hwif = drive->hwif;
521 struct request *rq = HWGROUP(drive)->rq;
522 unsigned int reading;
523 u8 dma_stat;
524
525 if (rq_data_dir(rq))
526 reading = 0;
527 else
528 reading = 1 << 3;
529
530 /* fall back to pio! */
531 if (!ide_build_dmatable(drive, rq)) {
532 ide_map_sg(drive, rq);
533 return 1;
534 }
535
536 /* PRD table */
Bartlomiej Zolnierkiewicz2ad1e552007-02-17 02:40:25 +0100537 if (hwif->mmio)
Bartlomiej Zolnierkiewicz0ecdca22007-02-17 02:40:25 +0100538 writel(hwif->dmatable_dma, (void __iomem *)hwif->dma_prdtable);
539 else
540 outl(hwif->dmatable_dma, hwif->dma_prdtable);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541
542 /* specify r/w */
543 hwif->OUTB(reading, hwif->dma_command);
544
545 /* read dma_status for INTR & ERROR flags */
546 dma_stat = hwif->INB(hwif->dma_status);
547
548 /* clear INTR & ERROR flags */
549 hwif->OUTB(dma_stat|6, hwif->dma_status);
550 drive->waiting_for_dma = 1;
551 return 0;
552}
553
554EXPORT_SYMBOL_GPL(ide_dma_setup);
555
556static void ide_dma_exec_cmd(ide_drive_t *drive, u8 command)
557{
558 /* issue cmd to drive */
559 ide_execute_command(drive, command, &ide_dma_intr, 2*WAIT_CMD, dma_timer_expiry);
560}
561
562void ide_dma_start(ide_drive_t *drive)
563{
564 ide_hwif_t *hwif = HWIF(drive);
565 u8 dma_cmd = hwif->INB(hwif->dma_command);
566
567 /* Note that this is done *after* the cmd has
568 * been issued to the drive, as per the BM-IDE spec.
569 * The Promise Ultra33 doesn't work correctly when
570 * we do this part before issuing the drive cmd.
571 */
572 /* start DMA */
573 hwif->OUTB(dma_cmd|1, hwif->dma_command);
574 hwif->dma = 1;
575 wmb();
576}
577
578EXPORT_SYMBOL_GPL(ide_dma_start);
579
580/* returns 1 on error, 0 otherwise */
581int __ide_dma_end (ide_drive_t *drive)
582{
583 ide_hwif_t *hwif = HWIF(drive);
584 u8 dma_stat = 0, dma_cmd = 0;
585
586 drive->waiting_for_dma = 0;
587 /* get dma_command mode */
588 dma_cmd = hwif->INB(hwif->dma_command);
589 /* stop DMA */
590 hwif->OUTB(dma_cmd&~1, hwif->dma_command);
591 /* get DMA status */
592 dma_stat = hwif->INB(hwif->dma_status);
593 /* clear the INTR & ERROR bits */
594 hwif->OUTB(dma_stat|6, hwif->dma_status);
595 /* purge DMA mappings */
596 ide_destroy_dmatable(drive);
597 /* verify good DMA status */
598 hwif->dma = 0;
599 wmb();
600 return (dma_stat & 7) != 4 ? (0x10 | dma_stat) : 0;
601}
602
603EXPORT_SYMBOL(__ide_dma_end);
604
605/* returns 1 if dma irq issued, 0 otherwise */
606static int __ide_dma_test_irq(ide_drive_t *drive)
607{
608 ide_hwif_t *hwif = HWIF(drive);
609 u8 dma_stat = hwif->INB(hwif->dma_status);
610
611#if 0 /* do not set unless you know what you are doing */
612 if (dma_stat & 4) {
613 u8 stat = hwif->INB(IDE_STATUS_REG);
614 hwif->OUTB(hwif->dma_status, dma_stat & 0xE4);
615 }
616#endif
617 /* return 1 if INTR asserted */
618 if ((dma_stat & 4) == 4)
619 return 1;
620 if (!drive->waiting_for_dma)
621 printk(KERN_WARNING "%s: (%s) called while not waiting\n",
622 drive->name, __FUNCTION__);
623 return 0;
624}
625#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
626
627int __ide_dma_bad_drive (ide_drive_t *drive)
628{
629 struct hd_driveid *id = drive->id;
630
Jordan Crouse65e5f2e2005-12-15 02:16:18 +0100631 int blacklist = ide_in_drive_list(id, drive_blacklist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 if (blacklist) {
633 printk(KERN_WARNING "%s: Disabling (U)DMA for %s (blacklisted)\n",
634 drive->name, id->model);
635 return blacklist;
636 }
637 return 0;
638}
639
640EXPORT_SYMBOL(__ide_dma_bad_drive);
641
642int __ide_dma_good_drive (ide_drive_t *drive)
643{
644 struct hd_driveid *id = drive->id;
Jordan Crouse65e5f2e2005-12-15 02:16:18 +0100645 return ide_in_drive_list(id, drive_whitelist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646}
647
648EXPORT_SYMBOL(__ide_dma_good_drive);
649
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200650static const u8 xfer_mode_bases[] = {
651 XFER_UDMA_0,
652 XFER_MW_DMA_0,
653 XFER_SW_DMA_0,
654};
655
656static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base)
657{
658 struct hd_driveid *id = drive->id;
659 ide_hwif_t *hwif = drive->hwif;
660 unsigned int mask = 0;
661
662 switch(base) {
663 case XFER_UDMA_0:
664 if ((id->field_valid & 4) == 0)
665 break;
666
667 mask = id->dma_ultra & hwif->ultra_mask;
668
669 if (hwif->udma_filter)
670 mask &= hwif->udma_filter(drive);
671
672 if ((mask & 0x78) && (eighty_ninty_three(drive) == 0))
673 mask &= 0x07;
674 break;
675 case XFER_MW_DMA_0:
Bartlomiej Zolnierkiewicz3649c062007-05-16 00:51:46 +0200676 if (id->field_valid & 2)
677 mask = id->dma_mword & hwif->mwdma_mask;
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200678 break;
679 case XFER_SW_DMA_0:
Bartlomiej Zolnierkiewicz15a4f942007-07-09 23:17:57 +0200680 if (id->field_valid & 2) {
Bartlomiej Zolnierkiewicz3649c062007-05-16 00:51:46 +0200681 mask = id->dma_1word & hwif->swdma_mask;
Bartlomiej Zolnierkiewicz15a4f942007-07-09 23:17:57 +0200682 } else if (id->tDMA) {
683 /*
684 * ide_fix_driveid() doesn't convert ->tDMA to the
685 * CPU endianness so we need to do it here
686 */
687 u8 mode = le16_to_cpu(id->tDMA);
688
689 /*
690 * if the mode is valid convert it to the mask
691 * (the maximum allowed mode is XFER_SW_DMA_2)
692 */
693 if (mode <= 2)
694 mask = ((2 << mode) - 1) & hwif->swdma_mask;
695 }
Bartlomiej Zolnierkiewicz2d5eaa62007-05-10 00:01:08 +0200696 break;
697 default:
698 BUG();
699 break;
700 }
701
702 return mask;
703}
704
705/**
706 * ide_max_dma_mode - compute DMA speed
707 * @drive: IDE device
708 *
709 * Checks the drive capabilities and returns the speed to use
710 * for the DMA transfer. Returns 0 if the drive is incapable
711 * of DMA transfers.
712 */
713
714u8 ide_max_dma_mode(ide_drive_t *drive)
715{
716 ide_hwif_t *hwif = drive->hwif;
717 unsigned int mask;
718 int x, i;
719 u8 mode = 0;
720
721 if (drive->media != ide_disk && hwif->atapi_dma == 0)
722 return 0;
723
724 for (i = 0; i < ARRAY_SIZE(xfer_mode_bases); i++) {
725 mask = ide_get_mode_mask(drive, xfer_mode_bases[i]);
726 x = fls(mask) - 1;
727 if (x >= 0) {
728 mode = xfer_mode_bases[i] + x;
729 break;
730 }
731 }
732
733 printk(KERN_DEBUG "%s: selected mode 0x%x\n", drive->name, mode);
734
735 return mode;
736}
737
738EXPORT_SYMBOL_GPL(ide_max_dma_mode);
739
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200740int ide_tune_dma(ide_drive_t *drive)
741{
742 u8 speed;
743
Bartlomiej Zolnierkiewicz122ab082007-05-16 00:51:46 +0200744 if ((drive->id->capability & 1) == 0 || drive->autodma == 0)
745 return 0;
746
747 /* consult the list of known "bad" drives */
748 if (__ide_dma_bad_drive(drive))
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200749 return 0;
750
751 speed = ide_max_dma_mode(drive);
752
753 if (!speed)
754 return 0;
755
Bartlomiej Zolnierkiewicz4728d542007-05-16 00:51:46 +0200756 if (drive->hwif->speedproc(drive, speed))
757 return 0;
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200758
Bartlomiej Zolnierkiewicz4728d542007-05-16 00:51:46 +0200759 return 1;
Bartlomiej Zolnierkiewicz29e744d2007-05-10 00:01:09 +0200760}
761
762EXPORT_SYMBOL_GPL(ide_tune_dma);
763
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764void ide_dma_verbose(ide_drive_t *drive)
765{
766 struct hd_driveid *id = drive->id;
767 ide_hwif_t *hwif = HWIF(drive);
768
769 if (id->field_valid & 4) {
770 if ((id->dma_ultra >> 8) && (id->dma_mword >> 8))
771 goto bug_dma_off;
772 if (id->dma_ultra & ((id->dma_ultra >> 8) & hwif->ultra_mask)) {
773 if (((id->dma_ultra >> 11) & 0x1F) &&
774 eighty_ninty_three(drive)) {
775 if ((id->dma_ultra >> 15) & 1) {
776 printk(", UDMA(mode 7)");
777 } else if ((id->dma_ultra >> 14) & 1) {
778 printk(", UDMA(133)");
779 } else if ((id->dma_ultra >> 13) & 1) {
780 printk(", UDMA(100)");
781 } else if ((id->dma_ultra >> 12) & 1) {
782 printk(", UDMA(66)");
783 } else if ((id->dma_ultra >> 11) & 1) {
784 printk(", UDMA(44)");
785 } else
786 goto mode_two;
787 } else {
788 mode_two:
789 if ((id->dma_ultra >> 10) & 1) {
790 printk(", UDMA(33)");
791 } else if ((id->dma_ultra >> 9) & 1) {
792 printk(", UDMA(25)");
793 } else if ((id->dma_ultra >> 8) & 1) {
794 printk(", UDMA(16)");
795 }
796 }
797 } else {
798 printk(", (U)DMA"); /* Can be BIOS-enabled! */
799 }
800 } else if (id->field_valid & 2) {
801 if ((id->dma_mword >> 8) && (id->dma_1word >> 8))
802 goto bug_dma_off;
803 printk(", DMA");
804 } else if (id->field_valid & 1) {
Jens Axboe0a8348d2006-07-28 08:58:26 +0200805 goto bug_dma_off;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 }
807 return;
808bug_dma_off:
809 printk(", BUG DMA OFF");
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100810 hwif->dma_off_quietly(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 return;
812}
813
814EXPORT_SYMBOL(ide_dma_verbose);
815
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100816int ide_set_dma(ide_drive_t *drive)
817{
818 ide_hwif_t *hwif = drive->hwif;
819 int rc;
820
821 rc = hwif->ide_dma_check(drive);
822
823 switch(rc) {
824 case -1: /* DMA needs to be disabled */
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100825 hwif->dma_off_quietly(drive);
Bartlomiej Zolnierkiewicz6f5050a2007-03-17 21:57:39 +0100826 return -1;
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100827 case 0: /* DMA needs to be enabled */
828 return hwif->ide_dma_on(drive);
829 case 1: /* DMA setting cannot be changed */
830 break;
831 default:
832 BUG();
833 break;
834 }
835
836 return rc;
837}
838
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
Sergei Shtylyov841d2a92007-07-09 23:17:54 +0200840void ide_dma_lost_irq (ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841{
842 printk("%s: DMA interrupt recovery\n", drive->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843}
844
Sergei Shtylyov841d2a92007-07-09 23:17:54 +0200845EXPORT_SYMBOL(ide_dma_lost_irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846
Sergei Shtylyovc283f5d2007-07-09 23:17:54 +0200847void ide_dma_timeout (ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848{
Sergei Shtylyovc283f5d2007-07-09 23:17:54 +0200849 ide_hwif_t *hwif = HWIF(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850
Sergei Shtylyovc283f5d2007-07-09 23:17:54 +0200851 printk(KERN_ERR "%s: timeout waiting for DMA\n", drive->name);
852
853 if (hwif->ide_dma_test_irq(drive))
854 return;
855
856 hwif->ide_dma_end(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857}
858
Sergei Shtylyovc283f5d2007-07-09 23:17:54 +0200859EXPORT_SYMBOL(ide_dma_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860
861/*
862 * Needed for allowing full modular support of ide-driver
863 */
864static int ide_release_dma_engine(ide_hwif_t *hwif)
865{
866 if (hwif->dmatable_cpu) {
867 pci_free_consistent(hwif->pci_dev,
868 PRD_ENTRIES * PRD_BYTES,
869 hwif->dmatable_cpu,
870 hwif->dmatable_dma);
871 hwif->dmatable_cpu = NULL;
872 }
873 return 1;
874}
875
876static int ide_release_iomio_dma(ide_hwif_t *hwif)
877{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 release_region(hwif->dma_base, 8);
Sergei Shtylylov020e3222006-10-03 01:14:13 -0700879 if (hwif->extra_ports)
880 release_region(hwif->extra_base, hwif->extra_ports);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 return 1;
882}
883
884/*
885 * Needed for allowing full modular support of ide-driver
886 */
Sergei Shtylylovdc844e02006-10-03 01:14:14 -0700887int ide_release_dma(ide_hwif_t *hwif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888{
Sergei Shtylylovdc844e02006-10-03 01:14:14 -0700889 ide_release_dma_engine(hwif);
890
Bartlomiej Zolnierkiewicz2ad1e552007-02-17 02:40:25 +0100891 if (hwif->mmio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 return 1;
Sergei Shtylylovdc844e02006-10-03 01:14:14 -0700893 else
894 return ide_release_iomio_dma(hwif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895}
896
897static int ide_allocate_dma_engine(ide_hwif_t *hwif)
898{
899 hwif->dmatable_cpu = pci_alloc_consistent(hwif->pci_dev,
900 PRD_ENTRIES * PRD_BYTES,
901 &hwif->dmatable_dma);
902
903 if (hwif->dmatable_cpu)
904 return 0;
905
Sergei Shtylylovdc844e02006-10-03 01:14:14 -0700906 printk(KERN_ERR "%s: -- Error, unable to allocate DMA table.\n",
907 hwif->cds->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 return 1;
910}
911
912static int ide_mapped_mmio_dma(ide_hwif_t *hwif, unsigned long base, unsigned int ports)
913{
914 printk(KERN_INFO " %s: MMIO-DMA ", hwif->name);
915
Sergei Shtylylov020e3222006-10-03 01:14:13 -0700916 hwif->dma_base = base;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917
918 if(hwif->mate)
919 hwif->dma_master = (hwif->channel) ? hwif->mate->dma_base : base;
920 else
921 hwif->dma_master = base;
922 return 0;
923}
924
925static int ide_iomio_dma(ide_hwif_t *hwif, unsigned long base, unsigned int ports)
926{
927 printk(KERN_INFO " %s: BM-DMA at 0x%04lx-0x%04lx",
Sergei Shtylylov020e3222006-10-03 01:14:13 -0700928 hwif->name, base, base + ports - 1);
929
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 if (!request_region(base, ports, hwif->name)) {
931 printk(" -- Error, ports in use.\n");
932 return 1;
933 }
Sergei Shtylylov020e3222006-10-03 01:14:13 -0700934
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 hwif->dma_base = base;
Sergei Shtylylov020e3222006-10-03 01:14:13 -0700936
937 if (hwif->cds->extra) {
938 hwif->extra_base = base + (hwif->channel ? 8 : 16);
939
940 if (!hwif->mate || !hwif->mate->extra_ports) {
941 if (!request_region(hwif->extra_base,
942 hwif->cds->extra, hwif->cds->name)) {
943 printk(" -- Error, extra ports in use.\n");
944 release_region(base, ports);
945 return 1;
946 }
947 hwif->extra_ports = hwif->cds->extra;
948 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 }
Sergei Shtylylov020e3222006-10-03 01:14:13 -0700950
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 if(hwif->mate)
Sergei Shtylyov3f63c5e2006-10-03 01:14:25 -0700952 hwif->dma_master = (hwif->channel) ? hwif->mate->dma_base:base;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953 else
954 hwif->dma_master = base;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955 return 0;
956}
957
958static int ide_dma_iobase(ide_hwif_t *hwif, unsigned long base, unsigned int ports)
959{
Bartlomiej Zolnierkiewicz2ad1e552007-02-17 02:40:25 +0100960 if (hwif->mmio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 return ide_mapped_mmio_dma(hwif, base,ports);
Bartlomiej Zolnierkiewicz2ad1e552007-02-17 02:40:25 +0100962
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 return ide_iomio_dma(hwif, base, ports);
964}
965
966/*
967 * This can be called for a dynamically installed interface. Don't __init it
968 */
969void ide_setup_dma (ide_hwif_t *hwif, unsigned long dma_base, unsigned int num_ports)
970{
971 if (ide_dma_iobase(hwif, dma_base, num_ports))
972 return;
973
974 if (ide_allocate_dma_engine(hwif)) {
975 ide_release_dma(hwif);
976 return;
977 }
978
979 if (!(hwif->dma_command))
980 hwif->dma_command = hwif->dma_base;
981 if (!(hwif->dma_vendor1))
982 hwif->dma_vendor1 = (hwif->dma_base + 1);
983 if (!(hwif->dma_status))
984 hwif->dma_status = (hwif->dma_base + 2);
985 if (!(hwif->dma_vendor3))
986 hwif->dma_vendor3 = (hwif->dma_base + 3);
987 if (!(hwif->dma_prdtable))
988 hwif->dma_prdtable = (hwif->dma_base + 4);
989
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100990 if (!hwif->dma_off_quietly)
991 hwif->dma_off_quietly = &ide_dma_off_quietly;
992 if (!hwif->dma_host_off)
993 hwif->dma_host_off = &ide_dma_host_off;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 if (!hwif->ide_dma_on)
995 hwif->ide_dma_on = &__ide_dma_on;
Bartlomiej Zolnierkiewiczccf35282007-02-17 02:40:26 +0100996 if (!hwif->dma_host_on)
997 hwif->dma_host_on = &ide_dma_host_on;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 if (!hwif->ide_dma_check)
Bartlomiej Zolnierkiewicz1116fae2007-08-20 22:42:55 +0200999 hwif->ide_dma_check = &config_drive_for_dma;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 if (!hwif->dma_setup)
1001 hwif->dma_setup = &ide_dma_setup;
1002 if (!hwif->dma_exec_cmd)
1003 hwif->dma_exec_cmd = &ide_dma_exec_cmd;
1004 if (!hwif->dma_start)
1005 hwif->dma_start = &ide_dma_start;
1006 if (!hwif->ide_dma_end)
1007 hwif->ide_dma_end = &__ide_dma_end;
1008 if (!hwif->ide_dma_test_irq)
1009 hwif->ide_dma_test_irq = &__ide_dma_test_irq;
Sergei Shtylyovc283f5d2007-07-09 23:17:54 +02001010 if (!hwif->dma_timeout)
1011 hwif->dma_timeout = &ide_dma_timeout;
Sergei Shtylyov841d2a92007-07-09 23:17:54 +02001012 if (!hwif->dma_lost_irq)
1013 hwif->dma_lost_irq = &ide_dma_lost_irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014
1015 if (hwif->chipset != ide_trm290) {
1016 u8 dma_stat = hwif->INB(hwif->dma_status);
1017 printk(", BIOS settings: %s:%s, %s:%s",
1018 hwif->drives[0].name, (dma_stat & 0x20) ? "DMA" : "pio",
1019 hwif->drives[1].name, (dma_stat & 0x40) ? "DMA" : "pio");
1020 }
1021 printk("\n");
1022
Eric Sesterhenn125e1872006-06-23 02:06:06 -07001023 BUG_ON(!hwif->dma_master);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024}
1025
1026EXPORT_SYMBOL_GPL(ide_setup_dma);
1027#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */