summaryrefslogtreecommitdiffstats
path: root/drivers/ide/pci/cs5530.c
blob: 0381961db263160f7a2a72ba923c1c6feb9607dd (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
/*
 * linux/drivers/ide/pci/cs5530.c		Version 0.7	Sept 10, 2002
 *
 * Copyright (C) 2000			Andre Hedrick <andre@linux-ide.org>
 * Ditto of GNU General Public License.
 *
 * Copyright (C) 2000			Mark Lord <mlord@pobox.com>
 * May be copied or modified under the terms of the GNU General Public License
 *
 * Development of this chipset driver was funded
 * by the nice folks at National Semiconductor.
 *
 * Documentation:
 *	CS5530 documentation available from National Semiconductor.
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/blkdev.h>
#include <linux/hdreg.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/ide.h>
#include <asm/io.h>
#include <asm/irq.h>

/**
 *	cs5530_xfer_set_mode	-	set a new transfer mode at the drive
 *	@drive: drive to tune
 *	@mode: new mode
 *
 *	Logging wrapper to the IDE driver speed configuration. This can
 *	probably go away now.
 */
 
static int cs5530_set_xfer_mode (ide_drive_t *drive, u8 mode)
{
	printk(KERN_DEBUG "%s: cs5530_set_xfer_mode(%s)\n",
		drive->name, ide_xfer_verbose(mode));
	return (ide_config_drive_speed(drive, mode));
}

/*
 * Here are the standard PIO mode 0-4 timings for each "format".
 * Format-0 uses fast data reg timings, with slower command reg timings.
 * Format-1 uses fast timings for all registers, but won't work with all drives.
 */
static unsigned int cs5530_pio_timings[2][5] = {
	{0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010},
	{0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}
};

/*
 * After chip reset, the PIO timings are set to 0x0000e132, which is not valid.
 */
#define CS5530_BAD_PIO(timings) (((timings)&~0x80000000)==0x0000e132)
#define CS5530_BASEREG(hwif)	(((hwif)->dma_base & ~0xf) + ((hwif)->channel ? 0x30 : 0x20))

/**
 *	cs5530_tuneproc		-	select/set PIO modes
 *
 *	cs5530_tuneproc() handles selection/setting of PIO modes
 *	for both the chipset and drive.
 *
 *	The ide_init_cs5530() routine guarantees that all drives
 *	will have valid default PIO timings set up before we get here.
 */

static void cs5530_tuneproc (ide_drive_t *drive, u8 pio)	/* pio=255 means "autotune" */
{
	ide_hwif_t	*hwif = HWIF(drive);
	unsigned int	format;
	unsigned long basereg = CS5530_BASEREG(hwif);
	static u8	modes[5] = { XFER_PIO_0, XFER_PIO_1, XFER_PIO_2, XFER_PIO_3, XFER_PIO_4};

	pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
	if (!cs5530_set_xfer_mode(drive, modes[pio])) {
		format = (hwif->INL(basereg+4) >> 31) & 1;
		hwif->OUTL(cs5530_pio_timings[format][pio],
			basereg+(drive->select.b.unit<<3));
	}
}

/**
 *	cs5530_config_dma	-	select/set DMA and UDMA modes
 *	@drive: drive to tune
 *
 *	cs5530_config_dma() handles selection/setting of DMA/UDMA modes
 *	for both the chipset and drive. The CS5530 has limitations about
 *	mixing DMA/UDMA on the same cable.
 */
 
static int cs5530_config_dma (ide_drive_t *drive)
{
	int			udma_ok = 1, mode = 0;
	ide_hwif_t		*hwif = HWIF(drive);
	int			unit = drive->select.b.unit;
	ide_drive_t		*mate = &hwif->drives[unit^1];
	struct hd_driveid	*id = drive->id;
	unsigned int		reg, timings;
	unsigned long		basereg;

	/*
	 * Default to DMA-off in case we run into trouble here.
	 */
	hwif->ide_dma_off_quietly(drive);
	/* turn off DMA while we fiddle */
	hwif->ide_dma_host_off(drive);
	/* clear DMA_capable bit */

	/*
	 * The CS5530 specifies that two drives sharing a cable cannot
	 * mix UDMA/MDMA.  It has to be one or the other, for the pair,
	 * though different timings can still be chosen for each drive.
	 * We could set the appropriate timing bits on the fly,
	 * but that might be a bit confusing.  So, for now we statically
	 * handle this requirement by looking at our mate drive to see
	 * what it is capable of, before choosing a mode for our own drive.
	 *
	 * Note: This relies on the fact we never fail from UDMA to MWDMA_2
	 * but instead drop to PIO
	 */
	if (mate->present) {
		struct hd_driveid *mateid = mate->id;
		if (mateid && (mateid->capability & 1) &&
		    !__ide_dma_bad_drive(mate)) {
			if ((mateid->field_valid & 4) &&
			    (mateid->dma_ultra & 7))
				udma_ok = 1;
			else if ((mateid->field_valid & 2) &&
				 (mateid->dma_mword & 7))
				udma_ok = 0;
			else
				udma_ok = 1;
		}
	}

	/*
	 * Now see what the current drive is capable of,
	 * selecting UDMA only if the mate said it was ok.
	 */
	if (id && (id->capability & 1) && drive->autodma &&
	    !__ide_dma_bad_drive(drive)) {
		if (udma_ok && (id->field_valid & 4) && (id->dma_ultra & 7)) {
			if      (id->dma_ultra & 4)
				mode = XFER_UDMA_2;
			else if (id->dma_ultra & 2)
				mode = XFER_UDMA_1;
			else if (id->dma_ultra & 1)
				mode = XFER_UDMA_0;
		}
		if (!mode && (id->field_valid & 2) && (id->dma_mword & 7)) {
			if      (id->dma_mword & 4)
				mode = XFER_MW_DMA_2;
			else if (id->dma_mword & 2)
				mode = XFER_MW_DMA_1;
			else if (id->dma_mword & 1)
				mode = XFER_MW_DMA_0;
		}
	}

	/*
	 * Tell the drive to switch to the new mode; abort on failure.
	 */
	if (!mode || cs5530_set_xfer_mode(drive, mode))
		return 1;	/* failure */

	/*
	 * Now tune the chipset to match the drive:
	 */
	switch (mode) {
		case XFER_UDMA_0:	timings = 0x00921250; break;
		case XFER_UDMA_1:	timings = 0x00911140; break;
		case XFER_UDMA_2:	timings = 0x00911030; break;
		case XFER_MW_DMA_0:	timings = 0x00077771; break;
		case XFER_MW_DMA_1:	timings = 0x00012121; break;
		case XFER_MW_DMA_2:	timings = 0x00002020; break;
		default:
			printk(KERN_ERR "%s: cs5530_config_dma: huh? mode=%02x\n",
				drive->name, mode);
			return 1;	/* failure */
	}
	basereg = CS5530_BASEREG(hwif);
	reg = hwif->INL(basereg+4);		/* get drive0 config register */
	timings |= reg & 0x80000000;		/* preserve PIO format bit */
	if (unit == 0) {			/* are we configuring drive0? */
		hwif->OUTL(timings, basereg+4);	/* write drive0 config register */
	} else {
		if (timings & 0x00100000)
			reg |=  0x00100000;	/* enable UDMA timings for both drives */
		else
			reg &= ~0x00100000;	/* disable UDMA timings for both drives */
		hwif->OUTL(reg,     basereg+4);	/* write drive0 config register */
		hwif->OUTL(timings, basereg+12);	/* write drive1 config register */
	}
	(void) hwif->ide_dma_host_on(drive);
	/* set DMA_capable bit */

	/*
	 * Finally, turn DMA on in software, and exit.
	 */
	return hwif->ide_dma_on(drive);	/* success */
}

/**
 *	init_chipset_5530	-	set up 5530 bridge
 *	@dev: PCI device
 *	@name: device name
 *
 *	Initialize the cs5530 bridge for reliable IDE DMA operation.
 */

static unsigned int __init init_chipset_cs5530 (struct pci_dev *dev, const char *name)
{
	struct pci_dev *master_0 = NULL, *cs5530_0 = NULL;
	unsigned long flags;

	dev = NULL;
	while ((dev = pci_find_device(PCI_VENDOR_ID_CYRIX, PCI_ANY_ID, dev)) != NULL) {
		switch (dev->device) {
			case PCI_DEVICE_ID_CYRIX_PCI_MASTER:
				master_0 = dev;
				break;
			case PCI_DEVICE_ID_CYRIX_5530_LEGACY:
				cs5530_0 = dev;
				break;
		}
	}
	if (!master_0) {
		printk(KERN_ERR "%s: unable to locate PCI MASTER function\n", name);
		return 0;
	}
	if (!cs5530_0) {
		printk(KERN_ERR "%s: unable to locate CS5530 LEGACY function\n", name);
		return 0;
	}

	spin_lock_irqsave(&ide_lock, flags);
		/* all CPUs (there should only be one CPU with this chipset) */

	/*
	 * Enable BusMaster and MemoryWriteAndInvalidate for the cs5530:
	 * -->  OR 0x14 into 16-bit PCI COMMAND reg of function 0 of the cs5530
	 */

	pci_set_master(cs5530_0);
	pci_set_mwi(cs5530_0);

	/*
	 * Set PCI CacheLineSize to 16-bytes:
	 * --> Write 0x04 into 8-bit PCI CACHELINESIZE reg of function 0 of the cs5530
	 */

	pci_write_config_byte(cs5530_0, PCI_CACHE_LINE_SIZE, 0x04);

	/*
	 * Disable trapping of UDMA register accesses (Win98 hack):
	 * --> Write 0x5006 into 16-bit reg at offset 0xd0 of function 0 of the cs5530
	 */

	pci_write_config_word(cs5530_0, 0xd0, 0x5006);

	/*
	 * Bit-1 at 0x40 enables MemoryWriteAndInvalidate on internal X-bus:
	 * The other settings are what is necessary to get the register
	 * into a sane state for IDE DMA operation.
	 */

	pci_write_config_byte(master_0, 0x40, 0x1e);

	/* 
	 * Set max PCI burst size (16-bytes seems to work best):
	 *	   16bytes: set bit-1 at 0x41 (reg value of 0x16)
	 *	all others: clear bit-1 at 0x41, and do:
	 *	  128bytes: OR 0x00 at 0x41
	 *	  256bytes: OR 0x04 at 0x41
	 *	  512bytes: OR 0x08 at 0x41
	 *	 1024bytes: OR 0x0c at 0x41
	 */

	pci_write_config_byte(master_0, 0x41, 0x14);

	/*
	 * These settings are necessary to get the chip
	 * into a sane state for IDE DMA operation.
	 */

	pci_write_config_byte(master_0, 0x42, 0x00);
	pci_write_config_byte(master_0, 0x43, 0xc1);

	spin_unlock_irqrestore(&ide_lock, flags);

	return 0;
}

/**
 *	init_hwif_cs5530	-	initialise an IDE channel
 *	@hwif: IDE to initialize
 *
 *	This gets invoked by the IDE driver once for each channel. It
 *	performs channel-specific pre-initialization before drive probing.
 */

static void __init init_hwif_cs5530 (ide_hwif_t *hwif)
{
	unsigned long basereg;
	u32 d0_timings;
	hwif->autodma = 0;

	if (hwif->mate)
		hwif->serialized = hwif->mate->serialized = 1;

	hwif->tuneproc = &cs5530_tuneproc;
	basereg = CS5530_BASEREG(hwif);
	d0_timings = hwif->INL(basereg+0);
	if (CS5530_BAD_PIO(d0_timings)) {
		/* PIO timings not initialized? */
		hwif->OUTL(cs5530_pio_timings[(d0_timings>>31)&1][0], basereg+0);
		if (!hwif->drives[0].autotune)
			hwif->drives[0].autotune = 1;
			/* needs autotuning later */
	}
	if (CS5530_BAD_PIO(hwif->INL(basereg+8))) {
	/* PIO timings not initialized? */
		hwif->OUTL(cs5530_pio_timings[(d0_timings>>31)&1][0], basereg+8);
		if (!hwif->drives[1].autotune)
			hwif->drives[1].autotune = 1;
			/* needs autotuning later */
	}

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

	hwif->ide_dma_check = &cs5530_config_dma;
	if (!noautodma)
		hwif->autodma = 1;
	hwif->drives[0].autodma = hwif->autodma;
	hwif->drives[1].autodma = hwif->autodma;
}

static ide_pci_device_t cs5530_chipset __devinitdata = {
	.name		= "CS5530",
	.init_chipset	= init_chipset_cs5530,
	.init_hwif	= init_hwif_cs5530,
	.channels	= 2,
	.autodma	= AUTODMA,
	.bootable	= ON_BOARD,
};

static int __devinit cs5530_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
	return ide_setup_pci_device(dev, &cs5530_chipset);
}

static struct pci_device_id cs5530_pci_tbl[] = {
	{ PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_IDE, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{ 0, },
};
MODULE_DEVICE_TABLE(pci, cs5530_pci_tbl);

static struct pci_driver driver = {
	.name		= "CS5530 IDE",
	.id_table	= cs5530_pci_tbl,
	.probe		= cs5530_init_one,
};

static int cs5530_ide_init(void)
{
	return ide_pci_register_driver(&driver);
}

module_init(cs5530_ide_init);

MODULE_AUTHOR("Mark Lord");
MODULE_DESCRIPTION("PCI driver module for Cyrix/NS 5530 IDE");
MODULE_LICENSE("GPL");