summaryrefslogtreecommitdiff
path: root/drivers/ide/pci/via82cxxx.c
blob: afdaee3c15c936147fd821aa5384375cdfd05877 (plain)
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
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
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
177
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
208
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
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
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
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
/*
 *
 * Version 3.38
 *
 * VIA IDE driver for Linux. Supported southbridges:
 *
 *   vt82c576, vt82c586, vt82c586a, vt82c586b, vt82c596a, vt82c596b,
 *   vt82c686, vt82c686a, vt82c686b, vt8231, vt8233, vt8233c, vt8233a,
 *   vt8235, vt8237
 *
 * Copyright (c) 2000-2002 Vojtech Pavlik
 *
 * Based on the work of:
 *	Michel Aubry
 *	Jeff Garzik
 *	Andre Hedrick
 *
 * Documentation:
 *	Obsolete device documentation publically available from via.com.tw
 *	Current device documentation available under NDA only
 */

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/blkdev.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/ide.h>
#include <asm/io.h>

#ifdef CONFIG_PPC_MULTIPLATFORM
#include <asm/processor.h>
#endif

#include "ide-timing.h"

#define DISPLAY_VIA_TIMINGS

#define VIA_IDE_ENABLE		0x40
#define VIA_IDE_CONFIG		0x41
#define VIA_FIFO_CONFIG		0x43
#define VIA_MISC_1		0x44
#define VIA_MISC_2		0x45
#define VIA_MISC_3		0x46
#define VIA_DRIVE_TIMING	0x48
#define VIA_8BIT_TIMING		0x4e
#define VIA_ADDRESS_SETUP	0x4c
#define VIA_UDMA_TIMING		0x50

#define VIA_UDMA		0x007
#define VIA_UDMA_NONE		0x000
#define VIA_UDMA_33		0x001
#define VIA_UDMA_66		0x002
#define VIA_UDMA_100		0x003
#define VIA_UDMA_133		0x004
#define VIA_BAD_PREQ		0x010	/* Crashes if PREQ# till DDACK# set */
#define VIA_BAD_CLK66		0x020	/* 66 MHz clock doesn't work correctly */
#define VIA_SET_FIFO		0x040	/* Needs to have FIFO split set */
#define VIA_NO_UNMASK		0x080	/* Doesn't work with IRQ unmasking on */
#define VIA_BAD_ID		0x100	/* Has wrong vendor ID (0x1107) */
#define VIA_BAD_AST		0x200	/* Don't touch Address Setup Timing */

/*
 * VIA SouthBridge chips.
 */

static struct via_isa_bridge {
	char *name;
	u16 id;
	u8 rev_min;
	u8 rev_max;
	u16 flags;
} via_isa_bridges[] = {
	{ "vt6410",	PCI_DEVICE_ID_VIA_6410,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
	{ "vt8251",	PCI_DEVICE_ID_VIA_8251,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
	{ "vt8237",	PCI_DEVICE_ID_VIA_8237,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
	{ "vt8235",	PCI_DEVICE_ID_VIA_8235,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
	{ "vt8233a",	PCI_DEVICE_ID_VIA_8233A,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
	{ "vt8233c",	PCI_DEVICE_ID_VIA_8233C_0,  0x00, 0x2f, VIA_UDMA_100 },
	{ "vt8233",	PCI_DEVICE_ID_VIA_8233_0,   0x00, 0x2f, VIA_UDMA_100 },
	{ "vt8231",	PCI_DEVICE_ID_VIA_8231,     0x00, 0x2f, VIA_UDMA_100 },
	{ "vt82c686b",	PCI_DEVICE_ID_VIA_82C686,   0x40, 0x4f, VIA_UDMA_100 },
	{ "vt82c686a",	PCI_DEVICE_ID_VIA_82C686,   0x10, 0x2f, VIA_UDMA_66 },
	{ "vt82c686",	PCI_DEVICE_ID_VIA_82C686,   0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
	{ "vt82c596b",	PCI_DEVICE_ID_VIA_82C596,   0x10, 0x2f, VIA_UDMA_66 },
	{ "vt82c596a",	PCI_DEVICE_ID_VIA_82C596,   0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
	{ "vt82c586b",	PCI_DEVICE_ID_VIA_82C586_0, 0x47, 0x4f, VIA_UDMA_33 | VIA_SET_FIFO },
	{ "vt82c586b",	PCI_DEVICE_ID_VIA_82C586_0, 0x40, 0x46, VIA_UDMA_33 | VIA_SET_FIFO | VIA_BAD_PREQ },
	{ "vt82c586b",	PCI_DEVICE_ID_VIA_82C586_0, 0x30, 0x3f, VIA_UDMA_33 | VIA_SET_FIFO },
	{ "vt82c586a",	PCI_DEVICE_ID_VIA_82C586_0, 0x20, 0x2f, VIA_UDMA_33 | VIA_SET_FIFO },
	{ "vt82c586",	PCI_DEVICE_ID_VIA_82C586_0, 0x00, 0x0f, VIA_UDMA_NONE | VIA_SET_FIFO },
	{ "vt82c576",	PCI_DEVICE_ID_VIA_82C576,   0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK },
	{ "vt82c576",	PCI_DEVICE_ID_VIA_82C576,   0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK | VIA_BAD_ID },
	{ NULL }
};

static unsigned int via_clock;
static char *via_dma[] = { "MWDMA16", "UDMA33", "UDMA66", "UDMA100", "UDMA133" };

struct via82cxxx_dev
{
	struct via_isa_bridge *via_config;
	unsigned int via_80w;
};

/**
 *	via_set_speed			-	write timing registers
 *	@dev: PCI device
 *	@dn: device
 *	@timing: IDE timing data to use
 *
 *	via_set_speed writes timing values to the chipset registers
 */

static void via_set_speed(ide_hwif_t *hwif, u8 dn, struct ide_timing *timing)
{
	struct pci_dev *dev = hwif->pci_dev;
	struct via82cxxx_dev *vdev = ide_get_hwifdata(hwif);
	u8 t;

	if (~vdev->via_config->flags & VIA_BAD_AST) {
		pci_read_config_byte(dev, VIA_ADDRESS_SETUP, &t);
		t = (t & ~(3 << ((3 - dn) << 1))) | ((FIT(timing->setup, 1, 4) - 1) << ((3 - dn) << 1));
		pci_write_config_byte(dev, VIA_ADDRESS_SETUP, t);
	}

	pci_write_config_byte(dev, VIA_8BIT_TIMING + (1 - (dn >> 1)),
		((FIT(timing->act8b, 1, 16) - 1) << 4) | (FIT(timing->rec8b, 1, 16) - 1));

	pci_write_config_byte(dev, VIA_DRIVE_TIMING + (3 - dn),
		((FIT(timing->active, 1, 16) - 1) << 4) | (FIT(timing->recover, 1, 16) - 1));

	switch (vdev->via_config->flags & VIA_UDMA) {
		case VIA_UDMA_33:  t = timing->udma ? (0xe0 | (FIT(timing->udma, 2, 5) - 2)) : 0x03; break;
		case VIA_UDMA_66:  t = timing->udma ? (0xe8 | (FIT(timing->udma, 2, 9) - 2)) : 0x0f; break;
		case VIA_UDMA_100: t = timing->udma ? (0xe0 | (FIT(timing->udma, 2, 9) - 2)) : 0x07; break;
		case VIA_UDMA_133: t = timing->udma ? (0xe0 | (FIT(timing->udma, 2, 9) - 2)) : 0x07; break;
		default: return;
	}

	pci_write_config_byte(dev, VIA_UDMA_TIMING + (3 - dn), t);
}

/**
 *	via_set_drive		-	configure transfer mode
 *	@drive: Drive to set up
 *	@speed: desired speed
 *
 *	via_set_drive() computes timing values configures the drive and
 *	the chipset to a desired transfer mode. It also can be called
 *	by upper layers.
 */

static int via_set_drive(ide_drive_t *drive, u8 speed)
{
	ide_drive_t *peer = HWIF(drive)->drives + (~drive->dn & 1);
	struct via82cxxx_dev *vdev = ide_get_hwifdata(drive->hwif);
	struct ide_timing t, p;
	unsigned int T, UT;

	if (speed != XFER_PIO_SLOW)
		ide_config_drive_speed(drive, speed);

	T = 1000000000 / via_clock;

	switch (vdev->via_config->flags & VIA_UDMA) {
		case VIA_UDMA_33:   UT = T;   break;
		case VIA_UDMA_66:   UT = T/2; break;
		case VIA_UDMA_100:  UT = T/3; break;
		case VIA_UDMA_133:  UT = T/4; break;
		default: UT = T;
	}

	ide_timing_compute(drive, speed, &t, T, UT);

	if (peer->present) {
		ide_timing_compute(peer, peer->current_speed, &p, T, UT);
		ide_timing_merge(&p, &t, &t, IDE_TIMING_8BIT);
	}

	via_set_speed(HWIF(drive), drive->dn, &t);

	if (!drive->init_speed)
		drive->init_speed = speed;
	drive->current_speed = speed;

	return 0;
}

/**
 *	via82cxxx_tune_drive	-	PIO setup
 *	@drive: drive to set up
 *	@pio: mode to use (255 for 'best possible')
 *
 *	A callback from the upper layers for PIO-only tuning.
 */

static void via82cxxx_tune_drive(ide_drive_t *drive, u8 pio)
{
	if (pio == 255) {
		via_set_drive(drive,
			ide_find_best_mode(drive, XFER_PIO | XFER_EPIO));
		return;
	}

	via_set_drive(drive, XFER_PIO_0 + min_t(u8, pio, 5));
}

/**
 *	via82cxxx_ide_dma_check		-	set up for DMA if possible
 *	@drive: IDE drive to set up
 *
 *	Set up the drive for the highest supported speed considering the
 *	driver, controller and cable
 */
 
static int via82cxxx_ide_dma_check (ide_drive_t *drive)
{
	ide_hwif_t *hwif = HWIF(drive);
	struct via82cxxx_dev *vdev = ide_get_hwifdata(hwif);
	u16 w80 = hwif->udma_four;

	u16 speed = ide_find_best_mode(drive,
		XFER_PIO | XFER_EPIO | XFER_SWDMA | XFER_MWDMA |
		(vdev->via_config->flags & VIA_UDMA ? XFER_UDMA : 0) |
		(w80 && (vdev->via_config->flags & VIA_UDMA) >= VIA_UDMA_66 ? XFER_UDMA_66 : 0) |
		(w80 && (vdev->via_config->flags & VIA_UDMA) >= VIA_UDMA_100 ? XFER_UDMA_100 : 0) |
		(w80 && (vdev->via_config->flags & VIA_UDMA) >= VIA_UDMA_133 ? XFER_UDMA_133 : 0));

	via_set_drive(drive, speed);

	if (drive->autodma && (speed & XFER_MODE) != XFER_PIO)
		return hwif->ide_dma_on(drive);
	return hwif->ide_dma_off_quietly(drive);
}

static struct via_isa_bridge *via_config_find(struct pci_dev **isa)
{
	struct via_isa_bridge *via_config;
	u8 t;

	for (via_config = via_isa_bridges; via_config->id; via_config++)
		if ((*isa = pci_find_device(PCI_VENDOR_ID_VIA +
			!!(via_config->flags & VIA_BAD_ID),
			via_config->id, NULL))) {

			pci_read_config_byte(*isa, PCI_REVISION_ID, &t);
			if (t >= via_config->rev_min &&
			    t <= via_config->rev_max)
				break;
		}

	return via_config;
}

/**
 *	init_chipset_via82cxxx	-	initialization handler
 *	@dev: PCI device
 *	@name: Name of interface
 *
 *	The initialization callback. Here we determine the IDE chip type
 *	and initialize its drive independent registers.
 */

static unsigned int __devinit init_chipset_via82cxxx(struct pci_dev *dev, const char *name)
{
	struct pci_dev *isa = NULL;
	struct via_isa_bridge *via_config;
	u8 t, v;
	unsigned int u;

	/*
	 * Find the ISA bridge to see how good the IDE is.
	 */
	via_config = via_config_find(&isa);
	if (!via_config->id) {
		printk(KERN_WARNING "VP_IDE: Unknown VIA SouthBridge, disabling DMA.\n");
		return -ENODEV;
	}

	/*
	 * Setup or disable Clk66 if appropriate
	 */

	if ((via_config->flags & VIA_UDMA) == VIA_UDMA_66) {
		/* Enable Clk66 */
		pci_read_config_dword(dev, VIA_UDMA_TIMING, &u);
		pci_write_config_dword(dev, VIA_UDMA_TIMING, u|0x80008);
	} else if (via_config->flags & VIA_BAD_CLK66) {
		/* Would cause trouble on 596a and 686 */
		pci_read_config_dword(dev, VIA_UDMA_TIMING, &u);
		pci_write_config_dword(dev, VIA_UDMA_TIMING, u & ~0x80008);
	}

	/*
	 * Check whether interfaces are enabled.
	 */

	pci_read_config_byte(dev, VIA_IDE_ENABLE, &v);

	/*
	 * Set up FIFO sizes and thresholds.
	 */

	pci_read_config_byte(dev, VIA_FIFO_CONFIG, &t);

	/* Disable PREQ# till DDACK# */
	if (via_config->flags & VIA_BAD_PREQ) {
		/* Would crash on 586b rev 41 */
		t &= 0x7f;
	}

	/* Fix FIFO split between channels */
	if (via_config->flags & VIA_SET_FIFO) {
		t &= (t & 0x9f);
		switch (v & 3) {
			case 2: t |= 0x00; break;	/* 16 on primary */
			case 1: t |= 0x60; break;	/* 16 on secondary */
			case 3: t |= 0x20; break;	/* 8 pri 8 sec */
		}
	}

	pci_write_config_byte(dev, VIA_FIFO_CONFIG, t);

	/*
	 * Determine system bus clock.
	 */

	via_clock = system_bus_clock() * 1000;

	switch (via_clock) {
		case 33000: via_clock = 33333; break;
		case 37000: via_clock = 37500; break;
		case 41000: via_clock = 41666; break;
	}

	if (via_clock < 20000 || via_clock > 50000) {
		printk(KERN_WARNING "VP_IDE: User given PCI clock speed "
			"impossible (%d), using 33 MHz instead.\n", via_clock);
		printk(KERN_WARNING "VP_IDE: Use ide0=ata66 if you want "
			"to assume 80-wire cable.\n");
		via_clock = 33333;
	}

	/*
	 * Print the boot message.
	 */

	pci_read_config_byte(isa, PCI_REVISION_ID, &t);
	printk(KERN_INFO "VP_IDE: VIA %s (rev %02x) IDE %s "
		"controller on pci%s\n",
		via_config->name, t,
		via_dma[via_config->flags & VIA_UDMA],
		pci_name(dev));

	return 0;
}

/*
 * Check and handle 80-wire cable presence
 */
static void __devinit via_cable_detect(struct pci_dev *dev, struct via82cxxx_dev *vdev)
{
	unsigned int u;
	int i;
	pci_read_config_dword(dev, VIA_UDMA_TIMING, &u);

	switch (vdev->via_config->flags & VIA_UDMA) {

		case VIA_UDMA_66:
			for (i = 24; i >= 0; i -= 8)
				if (((u >> (i & 16)) & 8) &&
				    ((u >> i) & 0x20) &&
				     (((u >> i) & 7) < 2)) {
					/*
					 * 2x PCI clock and
					 * UDMA w/ < 3T/cycle
					 */
					vdev->via_80w |= (1 << (1 - (i >> 4)));
				}
			break;

		case VIA_UDMA_100:
			for (i = 24; i >= 0; i -= 8)
				if (((u >> i) & 0x10) ||
				    (((u >> i) & 0x20) &&
				     (((u >> i) & 7) < 4))) {
					/* BIOS 80-wire bit or
					 * UDMA w/ < 60ns/cycle
					 */
					vdev->via_80w |= (1 << (1 - (i >> 4)));
				}
			break;

		case VIA_UDMA_133:
			for (i = 24; i >= 0; i -= 8)
				if (((u >> i) & 0x10) ||
				    (((u >> i) & 0x20) &&
				     (((u >> i) & 7) < 6))) {
					/* BIOS 80-wire bit or
					 * UDMA w/ < 60ns/cycle
					 */
					vdev->via_80w |= (1 << (1 - (i >> 4)));
				}
			break;

	}
}

static void __devinit init_hwif_via82cxxx(ide_hwif_t *hwif)
{
	struct via82cxxx_dev *vdev = kmalloc(sizeof(struct via82cxxx_dev),
		GFP_KERNEL);
	struct pci_dev *isa = NULL;
	int i;

	if (vdev == NULL) {
		printk(KERN_ERR "VP_IDE: out of memory :(\n");
		return;
	}

	memset(vdev, 0, sizeof(struct via82cxxx_dev));
	ide_set_hwifdata(hwif, vdev);

	vdev->via_config = via_config_find(&isa);
	via_cable_detect(hwif->pci_dev, vdev);

	hwif->autodma = 0;

	hwif->tuneproc = &via82cxxx_tune_drive;
	hwif->speedproc = &via_set_drive;


#if defined(CONFIG_PPC_CHRP) && defined(CONFIG_PPC32)
	if(machine_is(chrp) && _chrp_type == _CHRP_Pegasos) {
		hwif->irq = hwif->channel ? 15 : 14;
	}
#endif

	for (i = 0; i < 2; i++) {
		hwif->drives[i].io_32bit = 1;
		hwif->drives[i].unmask = (vdev->via_config->flags & VIA_NO_UNMASK) ? 0 : 1;
		hwif->drives[i].autotune = 1;
		hwif->drives[i].dn = hwif->channel * 2 + i;
	}

	if (!hwif->dma_base)
		return;

	hwif->atapi_dma = 1;
	hwif->ultra_mask = 0x7f;
	hwif->mwdma_mask = 0x07;
	hwif->swdma_mask = 0x07;

	if (!hwif->udma_four)
		hwif->udma_four = (vdev->via_80w >> hwif->channel) & 1;
	hwif->ide_dma_check = &via82cxxx_ide_dma_check;
	if (!noautodma)
		hwif->autodma = 1;
	hwif->drives[0].autodma = hwif->autodma;
	hwif->drives[1].autodma = hwif->autodma;
}

static ide_pci_device_t via82cxxx_chipsets[] __devinitdata = {
	{	/* 0 */
		.name		= "VP_IDE",
		.init_chipset	= init_chipset_via82cxxx,
		.init_hwif	= init_hwif_via82cxxx,
		.channels	= 2,
		.autodma	= NOAUTODMA,
		.enablebits	= {{0x40,0x02,0x02}, {0x40,0x01,0x01}},
		.bootable	= ON_BOARD
	},{	/* 1 */
		.name		= "VP_IDE",
		.init_chipset	= init_chipset_via82cxxx,
		.init_hwif	= init_hwif_via82cxxx,
		.channels	= 2,
		.autodma	= AUTODMA,
		.enablebits	= {{0x00,0x00,0x00}, {0x00,0x00,0x00}},
		.bootable	= ON_BOARD,
	}
};

static int __devinit via_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
	return ide_setup_pci_device(dev, &via82cxxx_chipsets[id->driver_data]);
}

static struct pci_device_id via_pci_tbl[] = {
	{ PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C576_1, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{ PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_1, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{ PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_6410,     PCI_ANY_ID, PCI_ANY_ID, 0, 0, 1},
	{ 0, },
};
MODULE_DEVICE_TABLE(pci, via_pci_tbl);

static struct pci_driver driver = {
	.name 		= "VIA_IDE",
	.id_table 	= via_pci_tbl,
	.probe 		= via_init_one,
};

static int via_ide_init(void)
{
	return ide_pci_register_driver(&driver);
}

module_init(via_ide_init);

MODULE_AUTHOR("Vojtech Pavlik, Michel Aubry, Jeff Garzik, Andre Hedrick");
MODULE_DESCRIPTION("PCI driver module for VIA IDE");
MODULE_LICENSE("GPL");