ide-dma.c 26.3 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
/*
 *  linux/drivers/ide/ide-dma.c		Version 4.10	June 9, 2000
 *
 *  Copyright (c) 1999-2000	Andre Hedrick <andre@linux-ide.org>
 *  May be copied or modified under the terms of the GNU General Public License
 */

/*
 *  Special Thanks to Mark for his Six years of work.
 *
 *  Copyright (c) 1995-1998  Mark Lord
 *  May be copied or modified under the terms of the GNU General Public License
 */

/*
 * This module provides support for the bus-master IDE DMA functions
 * of various PCI chipsets, including the Intel PIIX (i82371FB for
 * the 430 FX chipset), the PIIX3 (i82371SB for the 430 HX/VX and 
 * 440 chipsets), and the PIIX4 (i82371AB for the 430 TX chipset)
 * ("PIIX" stands for "PCI ISA IDE Xcellerator").
 *
 * Pretty much the same code works for other IDE PCI bus-mastering chipsets.
 *
 * DMA is supported for all IDE devices (disk drives, cdroms, tapes, floppies).
 *
 * By default, DMA support is prepared for use, but is currently enabled only
 * for drives which already have DMA enabled (UltraDMA or mode 2 multi/single),
 * or which are recognized as "good" (see table below).  Drives with only mode0
 * or mode1 (multi/single) DMA should also work with this chipset/driver
 * (eg. MC2112A) but are not enabled by default.
 *
 * Use "hdparm -i" to view modes supported by a given drive.
 *
 * The hdparm-3.5 (or later) utility can be used for manually enabling/disabling
 * DMA support, but must be (re-)compiled against this kernel version or later.
 *
 * To enable DMA, use "hdparm -d1 /dev/hd?" on a per-drive basis after booting.
 * If problems arise, ide.c will disable DMA operation after a few retries.
 * This error recovery mechanism works and has been extremely well exercised.
 *
 * IDE drives, depending on their vintage, may support several different modes
 * of DMA operation.  The boot-time modes are indicated with a "*" in
 * the "hdparm -i" listing, and can be changed with *knowledgeable* use of
 * the "hdparm -X" feature.  There is seldom a need to do this, as drives
 * normally power-up with their "best" PIO/DMA modes enabled.
 *
 * Testing has been done with a rather extensive number of drives,
 * with Quantum & Western Digital models generally outperforming the pack,
 * and Fujitsu & Conner (and some Seagate which are really Conner) drives
 * showing more lackluster throughput.
 *
 * Keep an eye on /var/adm/messages for "DMA disabled" messages.
 *
 * Some people have reported trouble with Intel Zappa motherboards.
 * This can be fixed by upgrading the AMI BIOS to version 1.00.04.BS0,
 * available from ftp://ftp.intel.com/pub/bios/10004bs0.exe
 * (thanks to Glen Morrell <glen@spin.Stanford.edu> for researching this).
 *
 * Thanks to "Christopher J. Reimer" <reimer@doe.carleton.ca> for
 * fixing the problem with the BIOS on some Acer motherboards.
 *
 * Thanks to "Benoit Poulot-Cazajous" <poulot@chorus.fr> for testing
 * "TX" chipset compatibility and for providing patches for the "TX" chipset.
 *
 * Thanks to Christian Brunner <chb@muc.de> for taking a good first crack
 * at generic DMA -- his patches were referred to when preparing this code.
 *
 * Most importantly, thanks to Robert Bringman <rob@mars.trion.com>
 * for supplying a Promise UDMA board & WD UDMA drive for this work!
 *
 * And, yes, Intel Zappa boards really *do* use both PIIX IDE ports.
 *
 * ATA-66/100 and recovery functions, I forgot the rest......
 *
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/ide.h>
#include <linux/delay.h>
#include <linux/scatterlist.h>

#include <asm/io.h>
#include <asm/irq.h>

static const struct drive_list_entry drive_whitelist [] = {

	{ "Micropolis 2112A"	,       "ALL"		},
	{ "CONNER CTMA 4000"	,       "ALL"		},
	{ "CONNER CTT8000-A"	,       "ALL"		},
	{ "ST34342A"		,	"ALL"		},
	{ NULL			,	NULL		}
};

static const struct drive_list_entry drive_blacklist [] = {

	{ "WDC AC11000H"	,	"ALL"		},
	{ "WDC AC22100H"	,	"ALL"		},
	{ "WDC AC32500H"	,	"ALL"		},
	{ "WDC AC33100H"	,	"ALL"		},
	{ "WDC AC31600H"	,	"ALL"		},
	{ "WDC AC32100H"	,	"24.09P07"	},
	{ "WDC AC23200L"	,	"21.10N21"	},
	{ "Compaq CRD-8241B"	,	"ALL"		},
	{ "CRD-8400B"		,	"ALL"		},
	{ "CRD-8480B",			"ALL"		},
	{ "CRD-8482B",			"ALL"		},
 	{ "CRD-84"		,	"ALL"		},
	{ "SanDisk SDP3B"	,	"ALL"		},
	{ "SanDisk SDP3B-64"	,	"ALL"		},
	{ "SANYO CD-ROM CRD"	,	"ALL"		},
	{ "HITACHI CDR-8"	,	"ALL"		},
	{ "HITACHI CDR-8335"	,	"ALL"		},
	{ "HITACHI CDR-8435"	,	"ALL"		},
	{ "Toshiba CD-ROM XM-6202B"	,	"ALL"		},
122
	{ "TOSHIBA CD-ROM XM-1702BC",	"ALL"		},
Linus Torvalds's avatar
Linus Torvalds committed
123
124
125
126
127
128
129
130
	{ "CD-532E-A"		,	"ALL"		},
	{ "E-IDE CD-ROM CR-840",	"ALL"		},
	{ "CD-ROM Drive/F5A",	"ALL"		},
	{ "WPI CDD-820",		"ALL"		},
	{ "SAMSUNG CD-ROM SC-148C",	"ALL"		},
	{ "SAMSUNG CD-ROM SC",	"ALL"		},
	{ "ATAPI CD-ROM DRIVE 40X MAXIMUM",	"ALL"		},
	{ "_NEC DV5800A",               "ALL"           },  
131
132
	{ "SAMSUNG CD-ROM SN-124",	"N001" },
	{ "Seagate STT20000A",		"ALL" },
Linus Torvalds's avatar
Linus Torvalds committed
133
134
135
136
137
	{ NULL			,	NULL		}

};

/**
138
 *	ide_in_drive_list	-	look for drive in black/white list
Linus Torvalds's avatar
Linus Torvalds committed
139
140
141
142
143
144
145
 *	@id: drive identifier
 *	@drive_table: list to inspect
 *
 *	Look for a drive in the blacklist and the whitelist tables
 *	Returns 1 if the drive is found in the table.
 */

146
int ide_in_drive_list(struct hd_driveid *id, const struct drive_list_entry *drive_table)
Linus Torvalds's avatar
Linus Torvalds committed
147
148
149
{
	for ( ; drive_table->id_model ; drive_table++)
		if ((!strcmp(drive_table->id_model, id->model)) &&
150
		    ((strstr(id->fw_rev, drive_table->id_firmware)) ||
Linus Torvalds's avatar
Linus Torvalds committed
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
		     (!strcmp(drive_table->id_firmware, "ALL"))))
			return 1;
	return 0;
}

/**
 *	ide_dma_intr	-	IDE DMA interrupt handler
 *	@drive: the drive the interrupt is for
 *
 *	Handle an interrupt completing a read/write DMA transfer on an 
 *	IDE device
 */
 
ide_startstop_t ide_dma_intr (ide_drive_t *drive)
{
	u8 stat = 0, dma_stat = 0;

	dma_stat = HWIF(drive)->ide_dma_end(drive);
	stat = HWIF(drive)->INB(IDE_STATUS_REG);	/* get drive status */
	if (OK_STAT(stat,DRIVE_READY,drive->bad_wstat|DRQ_STAT)) {
		if (!dma_stat) {
			struct request *rq = HWGROUP(drive)->rq;

			if (rq->rq_disk) {
				ide_driver_t *drv;

Alexey Dobriyan's avatar
Alexey Dobriyan committed
177
				drv = *(ide_driver_t **)rq->rq_disk->private_data;
Linus Torvalds's avatar
Linus Torvalds committed
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
				drv->end_request(drive, 1, rq->nr_sectors);
			} else
				ide_end_request(drive, 1, rq->nr_sectors);
			return ide_stopped;
		}
		printk(KERN_ERR "%s: dma_intr: bad DMA status (dma_stat=%x)\n", 
		       drive->name, dma_stat);
	}
	return ide_error(drive, "dma_intr", stat);
}

EXPORT_SYMBOL_GPL(ide_dma_intr);

#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
/**
 *	ide_build_sglist	-	map IDE scatter gather for DMA I/O
 *	@drive: the drive to build the DMA table for
 *	@rq: the request holding the sg list
 *
 *	Perform the PCI mapping magic necessary to access the source or
 *	target buffers of a request via PCI DMA. The lower layers of the
 *	kernel provide the necessary cache management so that we can
 *	operate in a portable fashion
 */

int ide_build_sglist(ide_drive_t *drive, struct request *rq)
{
	ide_hwif_t *hwif = HWIF(drive);
	struct scatterlist *sg = hwif->sg_table;

208
	BUG_ON((rq->cmd_type == REQ_TYPE_ATA_TASKFILE) && rq->nr_sectors > 256);
Linus Torvalds's avatar
Linus Torvalds committed
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353

	ide_map_sg(drive, rq);

	if (rq_data_dir(rq) == READ)
		hwif->sg_dma_direction = PCI_DMA_FROMDEVICE;
	else
		hwif->sg_dma_direction = PCI_DMA_TODEVICE;

	return pci_map_sg(hwif->pci_dev, sg, hwif->sg_nents, hwif->sg_dma_direction);
}

EXPORT_SYMBOL_GPL(ide_build_sglist);

/**
 *	ide_build_dmatable	-	build IDE DMA table
 *
 *	ide_build_dmatable() prepares a dma request. We map the command
 *	to get the pci bus addresses of the buffers and then build up
 *	the PRD table that the IDE layer wants to be fed. The code
 *	knows about the 64K wrap bug in the CS5530.
 *
 *	Returns the number of built PRD entries if all went okay,
 *	returns 0 otherwise.
 *
 *	May also be invoked from trm290.c
 */
 
int ide_build_dmatable (ide_drive_t *drive, struct request *rq)
{
	ide_hwif_t *hwif	= HWIF(drive);
	unsigned int *table	= hwif->dmatable_cpu;
	unsigned int is_trm290	= (hwif->chipset == ide_trm290) ? 1 : 0;
	unsigned int count = 0;
	int i;
	struct scatterlist *sg;

	hwif->sg_nents = i = ide_build_sglist(drive, rq);

	if (!i)
		return 0;

	sg = hwif->sg_table;
	while (i) {
		u32 cur_addr;
		u32 cur_len;

		cur_addr = sg_dma_address(sg);
		cur_len = sg_dma_len(sg);

		/*
		 * Fill in the dma table, without crossing any 64kB boundaries.
		 * Most hardware requires 16-bit alignment of all blocks,
		 * but the trm290 requires 32-bit alignment.
		 */

		while (cur_len) {
			if (count++ >= PRD_ENTRIES) {
				printk(KERN_ERR "%s: DMA table too small\n", drive->name);
				goto use_pio_instead;
			} else {
				u32 xcount, bcount = 0x10000 - (cur_addr & 0xffff);

				if (bcount > cur_len)
					bcount = cur_len;
				*table++ = cpu_to_le32(cur_addr);
				xcount = bcount & 0xffff;
				if (is_trm290)
					xcount = ((xcount >> 2) - 1) << 16;
				if (xcount == 0x0000) {
	/* 
	 * Most chipsets correctly interpret a length of 0x0000 as 64KB,
	 * but at least one (e.g. CS5530) misinterprets it as zero (!).
	 * So here we break the 64KB entry into two 32KB entries instead.
	 */
					if (count++ >= PRD_ENTRIES) {
						printk(KERN_ERR "%s: DMA table too small\n", drive->name);
						goto use_pio_instead;
					}
					*table++ = cpu_to_le32(0x8000);
					*table++ = cpu_to_le32(cur_addr + 0x8000);
					xcount = 0x8000;
				}
				*table++ = cpu_to_le32(xcount);
				cur_addr += bcount;
				cur_len -= bcount;
			}
		}

		sg++;
		i--;
	}

	if (count) {
		if (!is_trm290)
			*--table |= cpu_to_le32(0x80000000);
		return count;
	}
	printk(KERN_ERR "%s: empty DMA table?\n", drive->name);
use_pio_instead:
	pci_unmap_sg(hwif->pci_dev,
		     hwif->sg_table,
		     hwif->sg_nents,
		     hwif->sg_dma_direction);
	return 0; /* revert to PIO for this request */
}

EXPORT_SYMBOL_GPL(ide_build_dmatable);

/**
 *	ide_destroy_dmatable	-	clean up DMA mapping
 *	@drive: The drive to unmap
 *
 *	Teardown mappings after DMA has completed. This must be called
 *	after the completion of each use of ide_build_dmatable and before
 *	the next use of ide_build_dmatable. Failure to do so will cause
 *	an oops as only one mapping can be live for each target at a given
 *	time.
 */
 
void ide_destroy_dmatable (ide_drive_t *drive)
{
	struct pci_dev *dev = HWIF(drive)->pci_dev;
	struct scatterlist *sg = HWIF(drive)->sg_table;
	int nents = HWIF(drive)->sg_nents;

	pci_unmap_sg(dev, sg, nents, HWIF(drive)->sg_dma_direction);
}

EXPORT_SYMBOL_GPL(ide_destroy_dmatable);

/**
 *	config_drive_for_dma	-	attempt to activate IDE DMA
 *	@drive: the drive to place in DMA mode
 *
 *	If the drive supports at least mode 2 DMA or UDMA of any kind
 *	then attempt to place it into DMA mode. Drives that are known to
 *	support DMA but predate the DMA properties or that are known
 *	to have DMA handling bugs are also set up appropriately based
 *	on the good/bad drive lists.
 */
 
static int config_drive_for_dma (ide_drive_t *drive)
{
	struct hd_driveid *id = drive->id;

354
	if ((id->capability & 1) && drive->hwif->autodma) {
Linus Torvalds's avatar
Linus Torvalds committed
355
356
357
358
359
		/*
		 * Enable DMA on any drive that has
		 * UltraDMA (mode 0/1/2/3/4/5/6) enabled
		 */
		if ((id->field_valid & 4) && ((id->dma_ultra >> 8) & 0x7f))
360
			return 0;
Linus Torvalds's avatar
Linus Torvalds committed
361
362
363
364
365
366
367
		/*
		 * Enable DMA on any drive that has mode2 DMA
		 * (multi or single) enabled
		 */
		if (id->field_valid & 2)	/* regular DMA */
			if ((id->dma_mword & 0x404) == 0x404 ||
			    (id->dma_1word & 0x404) == 0x404)
368
				return 0;
Linus Torvalds's avatar
Linus Torvalds committed
369
370
371

		/* Consult the list of known "good" drives */
		if (__ide_dma_good_drive(drive))
372
			return 0;
Linus Torvalds's avatar
Linus Torvalds committed
373
	}
374
375

	return -1;
Linus Torvalds's avatar
Linus Torvalds committed
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
}

/**
 *	dma_timer_expiry	-	handle a DMA timeout
 *	@drive: Drive that timed out
 *
 *	An IDE DMA transfer timed out. In the event of an error we ask
 *	the driver to resolve the problem, if a DMA transfer is still
 *	in progress we continue to wait (arguably we need to add a 
 *	secondary 'I don't care what the drive thinks' timeout here)
 *	Finally if we have an interrupt we let it complete the I/O.
 *	But only one time - we clear expiry and if it's still not
 *	completed after WAIT_CMD, we error and retry in PIO.
 *	This can occur if an interrupt is lost or due to hang or bugs.
 */
 
static int dma_timer_expiry (ide_drive_t *drive)
{
	ide_hwif_t *hwif	= HWIF(drive);
	u8 dma_stat		= hwif->INB(hwif->dma_status);

	printk(KERN_WARNING "%s: dma_timer_expiry: dma status == 0x%02x\n",
		drive->name, dma_stat);

	if ((dma_stat & 0x18) == 0x18)	/* BUSY Stupid Early Timer !! */
		return WAIT_CMD;

	HWGROUP(drive)->expiry = NULL;	/* one free ride for now */

	/* 1 dmaing, 2 error, 4 intr */
	if (dma_stat & 2)	/* ERROR */
		return -1;

	if (dma_stat & 1)	/* DMAing */
		return WAIT_CMD;

	if (dma_stat & 4)	/* Got an Interrupt */
		return WAIT_CMD;

	return 0;	/* Status is unknown -- reset the bus */
}

/**
419
 *	ide_dma_host_off	-	Generic DMA kill
Linus Torvalds's avatar
Linus Torvalds committed
420
421
422
423
424
425
 *	@drive: drive to control
 *
 *	Perform the generic IDE controller DMA off operation. This
 *	works for most IDE bus mastering controllers
 */

426
void ide_dma_host_off(ide_drive_t *drive)
Linus Torvalds's avatar
Linus Torvalds committed
427
428
429
430
431
432
433
434
{
	ide_hwif_t *hwif	= HWIF(drive);
	u8 unit			= (drive->select.b.unit & 0x01);
	u8 dma_stat		= hwif->INB(hwif->dma_status);

	hwif->OUTB((dma_stat & ~(1<<(5+unit))), hwif->dma_status);
}

435
EXPORT_SYMBOL(ide_dma_host_off);
Linus Torvalds's avatar
Linus Torvalds committed
436
437

/**
438
 *	ide_dma_off_quietly	-	Generic DMA kill
Linus Torvalds's avatar
Linus Torvalds committed
439
440
441
442
443
 *	@drive: drive to control
 *
 *	Turn off the current DMA on this IDE controller. 
 */

444
void ide_dma_off_quietly(ide_drive_t *drive)
Linus Torvalds's avatar
Linus Torvalds committed
445
446
447
448
{
	drive->using_dma = 0;
	ide_toggle_bounce(drive, 0);

449
	drive->hwif->dma_host_off(drive);
Linus Torvalds's avatar
Linus Torvalds committed
450
451
}

452
EXPORT_SYMBOL(ide_dma_off_quietly);
Linus Torvalds's avatar
Linus Torvalds committed
453
454
455
#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */

/**
456
 *	ide_dma_off	-	disable DMA on a device
Linus Torvalds's avatar
Linus Torvalds committed
457
458
459
460
461
462
 *	@drive: drive to disable DMA on
 *
 *	Disable IDE DMA for a device on this IDE controller.
 *	Inform the user that DMA has been disabled.
 */

463
void ide_dma_off(ide_drive_t *drive)
Linus Torvalds's avatar
Linus Torvalds committed
464
465
{
	printk(KERN_INFO "%s: DMA disabled\n", drive->name);
466
	drive->hwif->dma_off_quietly(drive);
Linus Torvalds's avatar
Linus Torvalds committed
467
468
}

469
EXPORT_SYMBOL(ide_dma_off);
Linus Torvalds's avatar
Linus Torvalds committed
470
471
472

#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
/**
473
 *	ide_dma_host_on	-	Enable DMA on a host
Linus Torvalds's avatar
Linus Torvalds committed
474
475
476
477
478
 *	@drive: drive to enable for DMA
 *
 *	Enable DMA on an IDE controller following generic bus mastering
 *	IDE controller behaviour
 */
479
480

void ide_dma_host_on(ide_drive_t *drive)
Linus Torvalds's avatar
Linus Torvalds committed
481
482
483
484
485
486
487
488
489
490
{
	if (drive->using_dma) {
		ide_hwif_t *hwif	= HWIF(drive);
		u8 unit			= (drive->select.b.unit & 0x01);
		u8 dma_stat		= hwif->INB(hwif->dma_status);

		hwif->OUTB((dma_stat|(1<<(5+unit))), hwif->dma_status);
	}
}

491
EXPORT_SYMBOL(ide_dma_host_on);
Linus Torvalds's avatar
Linus Torvalds committed
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508

/**
 *	__ide_dma_on		-	Enable DMA on a device
 *	@drive: drive to enable DMA on
 *
 *	Enable IDE DMA for a device on this IDE controller.
 */
 
int __ide_dma_on (ide_drive_t *drive)
{
	/* consult the list of known "bad" drives */
	if (__ide_dma_bad_drive(drive))
		return 1;

	drive->using_dma = 1;
	ide_toggle_bounce(drive, 1);

509
	drive->hwif->dma_host_on(drive);
Linus Torvalds's avatar
Linus Torvalds committed
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561

	return 0;
}

EXPORT_SYMBOL(__ide_dma_on);

/**
 *	__ide_dma_check		-	check DMA setup
 *	@drive: drive to check
 *
 *	Don't use - due for extermination
 */
 
int __ide_dma_check (ide_drive_t *drive)
{
	return config_drive_for_dma(drive);
}

EXPORT_SYMBOL(__ide_dma_check);

/**
 *	ide_dma_setup	-	begin a DMA phase
 *	@drive: target device
 *
 *	Build an IDE DMA PRD (IDE speak for scatter gather table)
 *	and then set up the DMA transfer registers for a device
 *	that follows generic IDE PCI DMA behaviour. Controllers can
 *	override this function if they need to
 *
 *	Returns 0 on success. If a PIO fallback is required then 1
 *	is returned. 
 */

int ide_dma_setup(ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	struct request *rq = HWGROUP(drive)->rq;
	unsigned int reading;
	u8 dma_stat;

	if (rq_data_dir(rq))
		reading = 0;
	else
		reading = 1 << 3;

	/* fall back to pio! */
	if (!ide_build_dmatable(drive, rq)) {
		ide_map_sg(drive, rq);
		return 1;
	}

	/* PRD table */
562
	if (hwif->mmio)
563
564
565
		writel(hwif->dmatable_dma, (void __iomem *)hwif->dma_prdtable);
	else
		outl(hwif->dmatable_dma, hwif->dma_prdtable);
Linus Torvalds's avatar
Linus Torvalds committed
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655

	/* specify r/w */
	hwif->OUTB(reading, hwif->dma_command);

	/* read dma_status for INTR & ERROR flags */
	dma_stat = hwif->INB(hwif->dma_status);

	/* clear INTR & ERROR flags */
	hwif->OUTB(dma_stat|6, hwif->dma_status);
	drive->waiting_for_dma = 1;
	return 0;
}

EXPORT_SYMBOL_GPL(ide_dma_setup);

static void ide_dma_exec_cmd(ide_drive_t *drive, u8 command)
{
	/* issue cmd to drive */
	ide_execute_command(drive, command, &ide_dma_intr, 2*WAIT_CMD, dma_timer_expiry);
}

void ide_dma_start(ide_drive_t *drive)
{
	ide_hwif_t *hwif	= HWIF(drive);
	u8 dma_cmd		= hwif->INB(hwif->dma_command);

	/* Note that this is done *after* the cmd has
	 * been issued to the drive, as per the BM-IDE spec.
	 * The Promise Ultra33 doesn't work correctly when
	 * we do this part before issuing the drive cmd.
	 */
	/* start DMA */
	hwif->OUTB(dma_cmd|1, hwif->dma_command);
	hwif->dma = 1;
	wmb();
}

EXPORT_SYMBOL_GPL(ide_dma_start);

/* returns 1 on error, 0 otherwise */
int __ide_dma_end (ide_drive_t *drive)
{
	ide_hwif_t *hwif	= HWIF(drive);
	u8 dma_stat = 0, dma_cmd = 0;

	drive->waiting_for_dma = 0;
	/* get dma_command mode */
	dma_cmd = hwif->INB(hwif->dma_command);
	/* stop DMA */
	hwif->OUTB(dma_cmd&~1, hwif->dma_command);
	/* get DMA status */
	dma_stat = hwif->INB(hwif->dma_status);
	/* clear the INTR & ERROR bits */
	hwif->OUTB(dma_stat|6, hwif->dma_status);
	/* purge DMA mappings */
	ide_destroy_dmatable(drive);
	/* verify good DMA status */
	hwif->dma = 0;
	wmb();
	return (dma_stat & 7) != 4 ? (0x10 | dma_stat) : 0;
}

EXPORT_SYMBOL(__ide_dma_end);

/* returns 1 if dma irq issued, 0 otherwise */
static int __ide_dma_test_irq(ide_drive_t *drive)
{
	ide_hwif_t *hwif	= HWIF(drive);
	u8 dma_stat		= hwif->INB(hwif->dma_status);

#if 0  /* do not set unless you know what you are doing */
	if (dma_stat & 4) {
		u8 stat = hwif->INB(IDE_STATUS_REG);
		hwif->OUTB(hwif->dma_status, dma_stat & 0xE4);
	}
#endif
	/* return 1 if INTR asserted */
	if ((dma_stat & 4) == 4)
		return 1;
	if (!drive->waiting_for_dma)
		printk(KERN_WARNING "%s: (%s) called while not waiting\n",
			drive->name, __FUNCTION__);
	return 0;
}
#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */

int __ide_dma_bad_drive (ide_drive_t *drive)
{
	struct hd_driveid *id = drive->id;

656
	int blacklist = ide_in_drive_list(id, drive_blacklist);
Linus Torvalds's avatar
Linus Torvalds committed
657
658
659
660
661
662
663
664
665
666
667
668
669
	if (blacklist) {
		printk(KERN_WARNING "%s: Disabling (U)DMA for %s (blacklisted)\n",
				    drive->name, id->model);
		return blacklist;
	}
	return 0;
}

EXPORT_SYMBOL(__ide_dma_bad_drive);

int __ide_dma_good_drive (ide_drive_t *drive)
{
	struct hd_driveid *id = drive->id;
670
	return ide_in_drive_list(id, drive_whitelist);
Linus Torvalds's avatar
Linus Torvalds committed
671
672
673
674
}

EXPORT_SYMBOL(__ide_dma_good_drive);

675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
static const u8 xfer_mode_bases[] = {
	XFER_UDMA_0,
	XFER_MW_DMA_0,
	XFER_SW_DMA_0,
};

static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base)
{
	struct hd_driveid *id = drive->id;
	ide_hwif_t *hwif = drive->hwif;
	unsigned int mask = 0;

	switch(base) {
	case XFER_UDMA_0:
		if ((id->field_valid & 4) == 0)
			break;

		mask = id->dma_ultra & hwif->ultra_mask;

		if (hwif->udma_filter)
			mask &= hwif->udma_filter(drive);

		if ((mask & 0x78) && (eighty_ninty_three(drive) == 0))
			mask &= 0x07;
		break;
	case XFER_MW_DMA_0:
701
702
		if (id->field_valid & 2)
			mask = id->dma_mword & hwif->mwdma_mask;
703
704
		break;
	case XFER_SW_DMA_0:
705
706
		if (id->field_valid & 2)
			mask = id->dma_1word & hwif->swdma_mask;
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
		break;
	default:
		BUG();
		break;
	}

	return mask;
}

/**
 *	ide_max_dma_mode	-	compute DMA speed
 *	@drive: IDE device
 *
 *	Checks the drive capabilities and returns the speed to use
 *	for the DMA transfer.  Returns 0 if the drive is incapable
 *	of DMA transfers.
 */

u8 ide_max_dma_mode(ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	unsigned int mask;
	int x, i;
	u8 mode = 0;

	if (drive->media != ide_disk && hwif->atapi_dma == 0)
		return 0;

	for (i = 0; i < ARRAY_SIZE(xfer_mode_bases); i++) {
		mask = ide_get_mode_mask(drive, xfer_mode_bases[i]);
		x = fls(mask) - 1;
		if (x >= 0) {
			mode = xfer_mode_bases[i] + x;
			break;
		}
	}

	printk(KERN_DEBUG "%s: selected mode 0x%x\n", drive->name, mode);

	return mode;
}

EXPORT_SYMBOL_GPL(ide_max_dma_mode);

751
752
753
754
int ide_tune_dma(ide_drive_t *drive)
{
	u8 speed;

755
756
757
758
759
	if ((drive->id->capability & 1) == 0 || drive->autodma == 0)
		return 0;

	/* consult the list of known "bad" drives */
	if (__ide_dma_bad_drive(drive))
760
761
762
763
764
765
766
		return 0;

	speed = ide_max_dma_mode(drive);

	if (!speed)
		return 0;

767
768
	if (drive->hwif->speedproc(drive, speed))
		return 0;
769

770
	return 1;
771
772
773
774
}

EXPORT_SYMBOL_GPL(ide_tune_dma);

Linus Torvalds's avatar
Linus Torvalds committed
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
void ide_dma_verbose(ide_drive_t *drive)
{
	struct hd_driveid *id	= drive->id;
	ide_hwif_t *hwif	= HWIF(drive);

	if (id->field_valid & 4) {
		if ((id->dma_ultra >> 8) && (id->dma_mword >> 8))
			goto bug_dma_off;
		if (id->dma_ultra & ((id->dma_ultra >> 8) & hwif->ultra_mask)) {
			if (((id->dma_ultra >> 11) & 0x1F) &&
			    eighty_ninty_three(drive)) {
				if ((id->dma_ultra >> 15) & 1) {
					printk(", UDMA(mode 7)");
				} else if ((id->dma_ultra >> 14) & 1) {
					printk(", UDMA(133)");
				} else if ((id->dma_ultra >> 13) & 1) {
					printk(", UDMA(100)");
				} else if ((id->dma_ultra >> 12) & 1) {
					printk(", UDMA(66)");
				} else if ((id->dma_ultra >> 11) & 1) {
					printk(", UDMA(44)");
				} else
					goto mode_two;
			} else {
		mode_two:
				if ((id->dma_ultra >> 10) & 1) {
					printk(", UDMA(33)");
				} else if ((id->dma_ultra >> 9) & 1) {
					printk(", UDMA(25)");
				} else if ((id->dma_ultra >> 8) & 1) {
					printk(", UDMA(16)");
				}
			}
		} else {
			printk(", (U)DMA");	/* Can be BIOS-enabled! */
		}
	} else if (id->field_valid & 2) {
		if ((id->dma_mword >> 8) && (id->dma_1word >> 8))
			goto bug_dma_off;
		printk(", DMA");
	} else if (id->field_valid & 1) {
816
		goto bug_dma_off;
Linus Torvalds's avatar
Linus Torvalds committed
817
818
819
820
	}
	return;
bug_dma_off:
	printk(", BUG DMA OFF");
821
	hwif->dma_off_quietly(drive);
Linus Torvalds's avatar
Linus Torvalds committed
822
823
824
825
826
	return;
}

EXPORT_SYMBOL(ide_dma_verbose);

827
828
829
830
831
832
833
834
835
int ide_set_dma(ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	int rc;

	rc = hwif->ide_dma_check(drive);

	switch(rc) {
	case -1: /* DMA needs to be disabled */
836
		hwif->dma_off_quietly(drive);
837
		return -1;
838
839
840
841
842
843
844
845
846
847
848
849
850
851
	case  0: /* DMA needs to be enabled */
		return hwif->ide_dma_on(drive);
	case  1: /* DMA setting cannot be changed */
		break;
	default:
		BUG();
		break;
	}

	return rc;
}

EXPORT_SYMBOL_GPL(ide_set_dma);

Linus Torvalds's avatar
Linus Torvalds committed
852
#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
853
void ide_dma_lost_irq (ide_drive_t *drive)
Linus Torvalds's avatar
Linus Torvalds committed
854
855
856
857
{
	printk("%s: DMA interrupt recovery\n", drive->name);
}

858
EXPORT_SYMBOL(ide_dma_lost_irq);
Linus Torvalds's avatar
Linus Torvalds committed
859

860
void ide_dma_timeout (ide_drive_t *drive)
Linus Torvalds's avatar
Linus Torvalds committed
861
{
862
863
	ide_hwif_t *hwif = HWIF(drive);

Linus Torvalds's avatar
Linus Torvalds committed
864
865
	printk(KERN_ERR "%s: timeout waiting for DMA\n", drive->name);

866
867
868
869
	if (hwif->ide_dma_test_irq(drive))
		return;

	hwif->ide_dma_end(drive);
Linus Torvalds's avatar
Linus Torvalds committed
870
871
}

872
EXPORT_SYMBOL(ide_dma_timeout);
Linus Torvalds's avatar
Linus Torvalds committed
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891

/*
 * Needed for allowing full modular support of ide-driver
 */
static int ide_release_dma_engine(ide_hwif_t *hwif)
{
	if (hwif->dmatable_cpu) {
		pci_free_consistent(hwif->pci_dev,
				    PRD_ENTRIES * PRD_BYTES,
				    hwif->dmatable_cpu,
				    hwif->dmatable_dma);
		hwif->dmatable_cpu = NULL;
	}
	return 1;
}

static int ide_release_iomio_dma(ide_hwif_t *hwif)
{
	release_region(hwif->dma_base, 8);
892
893
	if (hwif->extra_ports)
		release_region(hwif->extra_base, hwif->extra_ports);
Linus Torvalds's avatar
Linus Torvalds committed
894
895
896
897
898
899
	return 1;
}

/*
 * Needed for allowing full modular support of ide-driver
 */
900
int ide_release_dma(ide_hwif_t *hwif)
Linus Torvalds's avatar
Linus Torvalds committed
901
{
902
903
	ide_release_dma_engine(hwif);

904
	if (hwif->mmio)
Linus Torvalds's avatar
Linus Torvalds committed
905
		return 1;
906
907
	else
		return ide_release_iomio_dma(hwif);
Linus Torvalds's avatar
Linus Torvalds committed
908
909
910
911
912
913
914
915
916
917
918
}

static int ide_allocate_dma_engine(ide_hwif_t *hwif)
{
	hwif->dmatable_cpu = pci_alloc_consistent(hwif->pci_dev,
						  PRD_ENTRIES * PRD_BYTES,
						  &hwif->dmatable_dma);

	if (hwif->dmatable_cpu)
		return 0;

919
920
	printk(KERN_ERR "%s: -- Error, unable to allocate DMA table.\n",
	       hwif->cds->name);
Linus Torvalds's avatar
Linus Torvalds committed
921
922
923
924
925
926
927
928

	return 1;
}

static int ide_mapped_mmio_dma(ide_hwif_t *hwif, unsigned long base, unsigned int ports)
{
	printk(KERN_INFO "    %s: MMIO-DMA ", hwif->name);

929
 	hwif->dma_base = base;
Linus Torvalds's avatar
Linus Torvalds committed
930
931
932
933
934
935
936
937
938
939
940

	if(hwif->mate)
		hwif->dma_master = (hwif->channel) ? hwif->mate->dma_base : base;
	else
		hwif->dma_master = base;
	return 0;
}

static int ide_iomio_dma(ide_hwif_t *hwif, unsigned long base, unsigned int ports)
{
	printk(KERN_INFO "    %s: BM-DMA at 0x%04lx-0x%04lx",
941
942
	       hwif->name, base, base + ports - 1);

Linus Torvalds's avatar
Linus Torvalds committed
943
944
945
946
	if (!request_region(base, ports, hwif->name)) {
		printk(" -- Error, ports in use.\n");
		return 1;
	}
947

Linus Torvalds's avatar
Linus Torvalds committed
948
	hwif->dma_base = base;
949
950
951
952
953
954
955
956
957
958
959
960
961

	if (hwif->cds->extra) {
		hwif->extra_base = base + (hwif->channel ? 8 : 16);

		if (!hwif->mate || !hwif->mate->extra_ports) {
			if (!request_region(hwif->extra_base,
					    hwif->cds->extra, hwif->cds->name)) {
				printk(" -- Error, extra ports in use.\n");
				release_region(base, ports);
				return 1;
			}
			hwif->extra_ports = hwif->cds->extra;
		}
Linus Torvalds's avatar
Linus Torvalds committed
962
	}
963

Linus Torvalds's avatar
Linus Torvalds committed
964
	if(hwif->mate)
965
		hwif->dma_master = (hwif->channel) ? hwif->mate->dma_base:base;
Linus Torvalds's avatar
Linus Torvalds committed
966
967
968
969
970
971
972
	else
		hwif->dma_master = base;
	return 0;
}

static int ide_dma_iobase(ide_hwif_t *hwif, unsigned long base, unsigned int ports)
{
973
	if (hwif->mmio)
Linus Torvalds's avatar
Linus Torvalds committed
974
		return ide_mapped_mmio_dma(hwif, base,ports);
975

Linus Torvalds's avatar
Linus Torvalds committed
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
	return ide_iomio_dma(hwif, base, ports);
}

/*
 * This can be called for a dynamically installed interface. Don't __init it
 */
void ide_setup_dma (ide_hwif_t *hwif, unsigned long dma_base, unsigned int num_ports)
{
	if (ide_dma_iobase(hwif, dma_base, num_ports))
		return;

	if (ide_allocate_dma_engine(hwif)) {
		ide_release_dma(hwif);
		return;
	}

	if (!(hwif->dma_command))
		hwif->dma_command	= hwif->dma_base;
	if (!(hwif->dma_vendor1))
		hwif->dma_vendor1	= (hwif->dma_base + 1);
	if (!(hwif->dma_status))
		hwif->dma_status	= (hwif->dma_base + 2);
	if (!(hwif->dma_vendor3))
		hwif->dma_vendor3	= (hwif->dma_base + 3);
	if (!(hwif->dma_prdtable))
		hwif->dma_prdtable	= (hwif->dma_base + 4);

1003
1004
1005
1006
	if (!hwif->dma_off_quietly)
		hwif->dma_off_quietly = &ide_dma_off_quietly;
	if (!hwif->dma_host_off)
		hwif->dma_host_off = &ide_dma_host_off;
Linus Torvalds's avatar
Linus Torvalds committed
1007
1008
	if (!hwif->ide_dma_on)
		hwif->ide_dma_on = &__ide_dma_on;
1009
1010
	if (!hwif->dma_host_on)
		hwif->dma_host_on = &ide_dma_host_on;
Linus Torvalds's avatar
Linus Torvalds committed
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
	if (!hwif->ide_dma_check)
		hwif->ide_dma_check = &__ide_dma_check;
	if (!hwif->dma_setup)
		hwif->dma_setup = &ide_dma_setup;
	if (!hwif->dma_exec_cmd)
		hwif->dma_exec_cmd = &ide_dma_exec_cmd;
	if (!hwif->dma_start)
		hwif->dma_start = &ide_dma_start;
	if (!hwif->ide_dma_end)
		hwif->ide_dma_end = &__ide_dma_end;
	if (!hwif->ide_dma_test_irq)
		hwif->ide_dma_test_irq = &__ide_dma_test_irq;
1023
1024
	if (!hwif->dma_timeout)
		hwif->dma_timeout = &ide_dma_timeout;
1025
1026
	if (!hwif->dma_lost_irq)
		hwif->dma_lost_irq = &ide_dma_lost_irq;
Linus Torvalds's avatar
Linus Torvalds committed
1027
1028
1029
1030
1031
1032
1033
1034
1035

	if (hwif->chipset != ide_trm290) {
		u8 dma_stat = hwif->INB(hwif->dma_status);
		printk(", BIOS settings: %s:%s, %s:%s",
		       hwif->drives[0].name, (dma_stat & 0x20) ? "DMA" : "pio",
		       hwif->drives[1].name, (dma_stat & 0x40) ? "DMA" : "pio");
	}
	printk("\n");

1036
	BUG_ON(!hwif->dma_master);
Linus Torvalds's avatar
Linus Torvalds committed
1037
1038
1039
1040
}

EXPORT_SYMBOL_GPL(ide_setup_dma);
#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */