summaryrefslogtreecommitdiff
path: root/drivers/i2c/busses/i2c-piix4.c
blob: a6f54ba27e2a5ff62bb24fca2982f13a2aed0aa3 (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
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
562
563
564
565
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
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
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
701
702
703
704
/*
    Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl> and
    Philip Edelbrock <phil@netroedge.com>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/*
   Supports:
	Intel PIIX4, 440MX
	Serverworks OSB4, CSB5, CSB6, HT-1000, HT-1100
	ATI IXP200, IXP300, IXP400, SB600, SB700/SP5100, SB800
	AMD Hudson-2, ML, CZ
	SMSC Victory66

   Note: we assume there can only be one device, with one or more
   SMBus interfaces.
*/

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/stddef.h>
#include <linux/ioport.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/dmi.h>
#include <linux/acpi.h>
#include <linux/io.h>


/* PIIX4 SMBus address offsets */
#define SMBHSTSTS	(0 + piix4_smba)
#define SMBHSLVSTS	(1 + piix4_smba)
#define SMBHSTCNT	(2 + piix4_smba)
#define SMBHSTCMD	(3 + piix4_smba)
#define SMBHSTADD	(4 + piix4_smba)
#define SMBHSTDAT0	(5 + piix4_smba)
#define SMBHSTDAT1	(6 + piix4_smba)
#define SMBBLKDAT	(7 + piix4_smba)
#define SMBSLVCNT	(8 + piix4_smba)
#define SMBSHDWCMD	(9 + piix4_smba)
#define SMBSLVEVT	(0xA + piix4_smba)
#define SMBSLVDAT	(0xC + piix4_smba)

/* count for request_region */
#define SMBIOSIZE	8

/* PCI Address Constants */
#define SMBBA		0x090
#define SMBHSTCFG	0x0D2
#define SMBSLVC		0x0D3
#define SMBSHDW1	0x0D4
#define SMBSHDW2	0x0D5
#define SMBREV		0x0D6

/* Other settings */
#define MAX_TIMEOUT	500
#define  ENABLE_INT9	0

/* PIIX4 constants */
#define PIIX4_QUICK		0x00
#define PIIX4_BYTE		0x04
#define PIIX4_BYTE_DATA		0x08
#define PIIX4_WORD_DATA		0x0C
#define PIIX4_BLOCK_DATA	0x14

/* insmod parameters */

/* If force is set to anything different from 0, we forcibly enable the
   PIIX4. DANGEROUS! */
static int force;
module_param (force, int, 0);
MODULE_PARM_DESC(force, "Forcibly enable the PIIX4. DANGEROUS!");

/* If force_addr is set to anything different from 0, we forcibly enable
   the PIIX4 at the given address. VERY DANGEROUS! */
static int force_addr;
module_param (force_addr, int, 0);
MODULE_PARM_DESC(force_addr,
		 "Forcibly enable the PIIX4 at the given address. "
		 "EXTREMELY DANGEROUS!");

static int srvrworks_csb5_delay;
static struct pci_driver piix4_driver;

static const struct dmi_system_id piix4_dmi_blacklist[] = {
	{
		.ident = "Sapphire AM2RD790",
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "SAPPHIRE Inc."),
			DMI_MATCH(DMI_BOARD_NAME, "PC-AM2RD790"),
		},
	},
	{
		.ident = "DFI Lanparty UT 790FX",
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "DFI Inc."),
			DMI_MATCH(DMI_BOARD_NAME, "LP UT 790FX"),
		},
	},
	{ }
};

/* The IBM entry is in a separate table because we only check it
   on Intel-based systems */
static const struct dmi_system_id piix4_dmi_ibm[] = {
	{
		.ident = "IBM",
		.matches = { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
	},
	{ },
};

struct i2c_piix4_adapdata {
	unsigned short smba;
};

static int piix4_setup(struct pci_dev *PIIX4_dev,
		       const struct pci_device_id *id)
{
	unsigned char temp;
	unsigned short piix4_smba;

	if ((PIIX4_dev->vendor == PCI_VENDOR_ID_SERVERWORKS) &&
	    (PIIX4_dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5))
		srvrworks_csb5_delay = 1;

	/* On some motherboards, it was reported that accessing the SMBus
	   caused severe hardware problems */
	if (dmi_check_system(piix4_dmi_blacklist)) {
		dev_err(&PIIX4_dev->dev,
			"Accessing the SMBus on this system is unsafe!\n");
		return -EPERM;
	}

	/* Don't access SMBus on IBM systems which get corrupted eeproms */
	if (dmi_check_system(piix4_dmi_ibm) &&
			PIIX4_dev->vendor == PCI_VENDOR_ID_INTEL) {
		dev_err(&PIIX4_dev->dev, "IBM system detected; this module "
			"may corrupt your serial eeprom! Refusing to load "
			"module!\n");
		return -EPERM;
	}

	/* Determine the address of the SMBus areas */
	if (force_addr) {
		piix4_smba = force_addr & 0xfff0;
		force = 0;
	} else {
		pci_read_config_word(PIIX4_dev, SMBBA, &piix4_smba);
		piix4_smba &= 0xfff0;
		if(piix4_smba == 0) {
			dev_err(&PIIX4_dev->dev, "SMBus base address "
				"uninitialized - upgrade BIOS or use "
				"force_addr=0xaddr\n");
			return -ENODEV;
		}
	}

	if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
		return -ENODEV;

	if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
		dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
			piix4_smba);
		return -EBUSY;
	}

	pci_read_config_byte(PIIX4_dev, SMBHSTCFG, &temp);

	/* If force_addr is set, we program the new address here. Just to make
	   sure, we disable the PIIX4 first. */
	if (force_addr) {
		pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp & 0xfe);
		pci_write_config_word(PIIX4_dev, SMBBA, piix4_smba);
		pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp | 0x01);
		dev_info(&PIIX4_dev->dev, "WARNING: SMBus interface set to "
			"new address %04x!\n", piix4_smba);
	} else if ((temp & 1) == 0) {
		if (force) {
			/* This should never need to be done, but has been
			 * noted that many Dell machines have the SMBus
			 * interface on the PIIX4 disabled!? NOTE: This assumes
			 * I/O space and other allocations WERE done by the
			 * Bios!  Don't complain if your hardware does weird
			 * things after enabling this. :') Check for Bios
			 * updates before resorting to this.
			 */
			pci_write_config_byte(PIIX4_dev, SMBHSTCFG,
					      temp | 1);
			dev_notice(&PIIX4_dev->dev,
				   "WARNING: SMBus interface has been FORCEFULLY ENABLED!\n");
		} else {
			dev_err(&PIIX4_dev->dev,
				"SMBus Host Controller not enabled!\n");
			release_region(piix4_smba, SMBIOSIZE);
			return -ENODEV;
		}
	}

	if (((temp & 0x0E) == 8) || ((temp & 0x0E) == 2))
		dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus\n");
	else if ((temp & 0x0E) == 0)
		dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus\n");
	else
		dev_err(&PIIX4_dev->dev, "Illegal Interrupt configuration "
			"(or code out of date)!\n");

	pci_read_config_byte(PIIX4_dev, SMBREV, &temp);
	dev_info(&PIIX4_dev->dev,
		 "SMBus Host Controller at 0x%x, revision %d\n",
		 piix4_smba, temp);

	return piix4_smba;
}

static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
			     const struct pci_device_id *id, u8 aux)
{
	unsigned short piix4_smba;
	unsigned short smba_idx = 0xcd6;
	u8 smba_en_lo, smba_en_hi, smb_en, smb_en_status;
	u8 i2ccfg, i2ccfg_offset = 0x10;

	/* SB800 and later SMBus does not support forcing address */
	if (force || force_addr) {
		dev_err(&PIIX4_dev->dev, "SMBus does not support "
			"forcing address!\n");
		return -EINVAL;
	}

	/* Determine the address of the SMBus areas */
	if ((PIIX4_dev->vendor == PCI_VENDOR_ID_AMD &&
	     PIIX4_dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS &&
	     PIIX4_dev->revision >= 0x41) ||
	    (PIIX4_dev->vendor == PCI_VENDOR_ID_AMD &&
	     PIIX4_dev->device == 0x790b &&
	     PIIX4_dev->revision >= 0x49))
		smb_en = 0x00;
	else
		smb_en = (aux) ? 0x28 : 0x2c;

	if (!request_region(smba_idx, 2, "smba_idx")) {
		dev_err(&PIIX4_dev->dev, "SMBus base address index region "
			"0x%x already in use!\n", smba_idx);
		return -EBUSY;
	}
	outb_p(smb_en, smba_idx);
	smba_en_lo = inb_p(smba_idx + 1);
	outb_p(smb_en + 1, smba_idx);
	smba_en_hi = inb_p(smba_idx + 1);
	release_region(smba_idx, 2);

	if (!smb_en) {
		smb_en_status = smba_en_lo & 0x10;
		piix4_smba = smba_en_hi << 8;
		if (aux)
			piix4_smba |= 0x20;
	} else {
		smb_en_status = smba_en_lo & 0x01;
		piix4_smba = ((smba_en_hi << 8) | smba_en_lo) & 0xffe0;
	}

	if (!smb_en_status) {
		dev_err(&PIIX4_dev->dev,
			"SMBus Host Controller not enabled!\n");
		return -ENODEV;
	}

	if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
		return -ENODEV;

	if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
		dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
			piix4_smba);
		return -EBUSY;
	}

	/* Aux SMBus does not support IRQ information */
	if (aux) {
		dev_info(&PIIX4_dev->dev,
			 "Auxiliary SMBus Host Controller at 0x%x\n",
			 piix4_smba);
		return piix4_smba;
	}

	/* Request the SMBus I2C bus config region */
	if (!request_region(piix4_smba + i2ccfg_offset, 1, "i2ccfg")) {
		dev_err(&PIIX4_dev->dev, "SMBus I2C bus config region "
			"0x%x already in use!\n", piix4_smba + i2ccfg_offset);
		release_region(piix4_smba, SMBIOSIZE);
		return -EBUSY;
	}
	i2ccfg = inb_p(piix4_smba + i2ccfg_offset);
	release_region(piix4_smba + i2ccfg_offset, 1);

	if (i2ccfg & 1)
		dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus\n");
	else
		dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus\n");

	dev_info(&PIIX4_dev->dev,
		 "SMBus Host Controller at 0x%x, revision %d\n",
		 piix4_smba, i2ccfg >> 4);

	return piix4_smba;
}

static int piix4_setup_aux(struct pci_dev *PIIX4_dev,
			   const struct pci_device_id *id,
			   unsigned short base_reg_addr)
{
	/* Set up auxiliary SMBus controllers found on some
	 * AMD chipsets e.g. SP5100 (SB700 derivative) */

	unsigned short piix4_smba;

	/* Read address of auxiliary SMBus controller */
	pci_read_config_word(PIIX4_dev, base_reg_addr, &piix4_smba);
	if ((piix4_smba & 1) == 0) {
		dev_dbg(&PIIX4_dev->dev,
			"Auxiliary SMBus controller not enabled\n");
		return -ENODEV;
	}

	piix4_smba &= 0xfff0;
	if (piix4_smba == 0) {
		dev_dbg(&PIIX4_dev->dev,
			"Auxiliary SMBus base address uninitialized\n");
		return -ENODEV;
	}

	if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
		return -ENODEV;

	if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
		dev_err(&PIIX4_dev->dev, "Auxiliary SMBus region 0x%x "
			"already in use!\n", piix4_smba);
		return -EBUSY;
	}

	dev_info(&PIIX4_dev->dev,
		 "Auxiliary SMBus Host Controller at 0x%x\n",
		 piix4_smba);

	return piix4_smba;
}

static int piix4_transaction(struct i2c_adapter *piix4_adapter)
{
	struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(piix4_adapter);
	unsigned short piix4_smba = adapdata->smba;
	int temp;
	int result = 0;
	int timeout = 0;

	dev_dbg(&piix4_adapter->dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
		"ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
		inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
		inb_p(SMBHSTDAT1));

	/* Make sure the SMBus host is ready to start transmitting */
	if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
		dev_dbg(&piix4_adapter->dev, "SMBus busy (%02x). "
			"Resetting...\n", temp);
		outb_p(temp, SMBHSTSTS);
		if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
			dev_err(&piix4_adapter->dev, "Failed! (%02x)\n", temp);
			return -EBUSY;
		} else {
			dev_dbg(&piix4_adapter->dev, "Successful!\n");
		}
	}

	/* start the transaction by setting bit 6 */
	outb_p(inb(SMBHSTCNT) | 0x040, SMBHSTCNT);

	/* We will always wait for a fraction of a second! (See PIIX4 docs errata) */
	if (srvrworks_csb5_delay) /* Extra delay for SERVERWORKS_CSB5 */
		msleep(2);
	else
		msleep(1);

	while ((++timeout < MAX_TIMEOUT) &&
	       ((temp = inb_p(SMBHSTSTS)) & 0x01))
		msleep(1);

	/* If the SMBus is still busy, we give up */
	if (timeout == MAX_TIMEOUT) {
		dev_err(&piix4_adapter->dev, "SMBus Timeout!\n");
		result = -ETIMEDOUT;
	}

	if (temp & 0x10) {
		result = -EIO;
		dev_err(&piix4_adapter->dev, "Error: Failed bus transaction\n");
	}

	if (temp & 0x08) {
		result = -EIO;
		dev_dbg(&piix4_adapter->dev, "Bus collision! SMBus may be "
			"locked until next hard reset. (sorry!)\n");
		/* Clock stops and slave is stuck in mid-transmission */
	}

	if (temp & 0x04) {
		result = -ENXIO;
		dev_dbg(&piix4_adapter->dev, "Error: no response!\n");
	}

	if (inb_p(SMBHSTSTS) != 0x00)
		outb_p(inb(SMBHSTSTS), SMBHSTSTS);

	if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
		dev_err(&piix4_adapter->dev, "Failed reset at end of "
			"transaction (%02x)\n", temp);
	}
	dev_dbg(&piix4_adapter->dev, "Transaction (post): CNT=%02x, CMD=%02x, "
		"ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
		inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
		inb_p(SMBHSTDAT1));
	return result;
}

/* Return negative errno on error. */
static s32 piix4_access(struct i2c_adapter * adap, u16 addr,
		 unsigned short flags, char read_write,
		 u8 command, int size, union i2c_smbus_data * data)
{
	struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
	unsigned short piix4_smba = adapdata->smba;
	int i, len;
	int status;

	switch (size) {
	case I2C_SMBUS_QUICK:
		outb_p((addr << 1) | read_write,
		       SMBHSTADD);
		size = PIIX4_QUICK;
		break;
	case I2C_SMBUS_BYTE:
		outb_p((addr << 1) | read_write,
		       SMBHSTADD);
		if (read_write == I2C_SMBUS_WRITE)
			outb_p(command, SMBHSTCMD);
		size = PIIX4_BYTE;
		break;
	case I2C_SMBUS_BYTE_DATA:
		outb_p((addr << 1) | read_write,
		       SMBHSTADD);
		outb_p(command, SMBHSTCMD);
		if (read_write == I2C_SMBUS_WRITE)
			outb_p(data->byte, SMBHSTDAT0);
		size = PIIX4_BYTE_DATA;
		break;
	case I2C_SMBUS_WORD_DATA:
		outb_p((addr << 1) | read_write,
		       SMBHSTADD);
		outb_p(command, SMBHSTCMD);
		if (read_write == I2C_SMBUS_WRITE) {
			outb_p(data->word & 0xff, SMBHSTDAT0);
			outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
		}
		size = PIIX4_WORD_DATA;
		break;
	case I2C_SMBUS_BLOCK_DATA:
		outb_p((addr << 1) | read_write,
		       SMBHSTADD);
		outb_p(command, SMBHSTCMD);
		if (read_write == I2C_SMBUS_WRITE) {
			len = data->block[0];
			if (len == 0 || len > I2C_SMBUS_BLOCK_MAX)
				return -EINVAL;
			outb_p(len, SMBHSTDAT0);
			i = inb_p(SMBHSTCNT);	/* Reset SMBBLKDAT */
			for (i = 1; i <= len; i++)
				outb_p(data->block[i], SMBBLKDAT);
		}
		size = PIIX4_BLOCK_DATA;
		break;
	default:
		dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
		return -EOPNOTSUPP;
	}

	outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT);

	status = piix4_transaction(adap);
	if (status)
		return status;

	if ((read_write == I2C_SMBUS_WRITE) || (size == PIIX4_QUICK))
		return 0;


	switch (size) {
	case PIIX4_BYTE:
	case PIIX4_BYTE_DATA:
		data->byte = inb_p(SMBHSTDAT0);
		break;
	case PIIX4_WORD_DATA:
		data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
		break;
	case PIIX4_BLOCK_DATA:
		data->block[0] = inb_p(SMBHSTDAT0);
		if (data->block[0] == 0 || data->block[0] > I2C_SMBUS_BLOCK_MAX)
			return -EPROTO;
		i = inb_p(SMBHSTCNT);	/* Reset SMBBLKDAT */
		for (i = 1; i <= data->block[0]; i++)
			data->block[i] = inb_p(SMBBLKDAT);
		break;
	}
	return 0;
}

static u32 piix4_func(struct i2c_adapter *adapter)
{
	return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
	    I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
	    I2C_FUNC_SMBUS_BLOCK_DATA;
}

static const struct i2c_algorithm smbus_algorithm = {
	.smbus_xfer	= piix4_access,
	.functionality	= piix4_func,
};

static const struct pci_device_id piix4_ids[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3) },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443MX_3) },
	{ PCI_DEVICE(PCI_VENDOR_ID_EFAR, PCI_DEVICE_ID_EFAR_SLC90E66_3) },
	{ PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP200_SMBUS) },
	{ PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP300_SMBUS) },
	{ PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS) },
	{ PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS) },
	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_HUDSON2_SMBUS) },
	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x790b) },
	{ PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
		     PCI_DEVICE_ID_SERVERWORKS_OSB4) },
	{ PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
		     PCI_DEVICE_ID_SERVERWORKS_CSB5) },
	{ PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
		     PCI_DEVICE_ID_SERVERWORKS_CSB6) },
	{ PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
		     PCI_DEVICE_ID_SERVERWORKS_HT1000SB) },
	{ PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
		     PCI_DEVICE_ID_SERVERWORKS_HT1100LD) },
	{ 0, }
};

MODULE_DEVICE_TABLE (pci, piix4_ids);

static struct i2c_adapter *piix4_main_adapter;
static struct i2c_adapter *piix4_aux_adapter;

static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba,
			     struct i2c_adapter **padap)
{
	struct i2c_adapter *adap;
	struct i2c_piix4_adapdata *adapdata;
	int retval;

	adap = kzalloc(sizeof(*adap), GFP_KERNEL);
	if (adap == NULL) {
		release_region(smba, SMBIOSIZE);
		return -ENOMEM;
	}

	adap->owner = THIS_MODULE;
	adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
	adap->algo = &smbus_algorithm;

	adapdata = kzalloc(sizeof(*adapdata), GFP_KERNEL);
	if (adapdata == NULL) {
		kfree(adap);
		release_region(smba, SMBIOSIZE);
		return -ENOMEM;
	}

	adapdata->smba = smba;

	/* set up the sysfs linkage to our parent device */
	adap->dev.parent = &dev->dev;

	snprintf(adap->name, sizeof(adap->name),
		"SMBus PIIX4 adapter at %04x", smba);

	i2c_set_adapdata(adap, adapdata);

	retval = i2c_add_adapter(adap);
	if (retval) {
		dev_err(&dev->dev, "Couldn't register adapter!\n");
		kfree(adapdata);
		kfree(adap);
		release_region(smba, SMBIOSIZE);
		return retval;
	}

	*padap = adap;
	return 0;
}

static int piix4_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
	int retval;

	if ((dev->vendor == PCI_VENDOR_ID_ATI &&
	     dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
	     dev->revision >= 0x40) ||
	    dev->vendor == PCI_VENDOR_ID_AMD)
		/* base address location etc changed in SB800 */
		retval = piix4_setup_sb800(dev, id, 0);
	else
		retval = piix4_setup(dev, id);

	/* If no main SMBus found, give up */
	if (retval < 0)
		return retval;

	/* Try to register main SMBus adapter, give up if we can't */
	retval = piix4_add_adapter(dev, retval, &piix4_main_adapter);
	if (retval < 0)
		return retval;

	/* Check for auxiliary SMBus on some AMD chipsets */
	retval = -ENODEV;

	if (dev->vendor == PCI_VENDOR_ID_ATI &&
	    dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS) {
		if (dev->revision < 0x40) {
			retval = piix4_setup_aux(dev, id, 0x58);
		} else {
			/* SB800 added aux bus too */
			retval = piix4_setup_sb800(dev, id, 1);
		}
	}

	if (dev->vendor == PCI_VENDOR_ID_AMD &&
	    dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS) {
		retval = piix4_setup_sb800(dev, id, 1);
	}

	if (retval > 0) {
		/* Try to add the aux adapter if it exists,
		 * piix4_add_adapter will clean up if this fails */
		piix4_add_adapter(dev, retval, &piix4_aux_adapter);
	}

	return 0;
}

static void piix4_adap_remove(struct i2c_adapter *adap)
{
	struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);

	if (adapdata->smba) {
		i2c_del_adapter(adap);
		release_region(adapdata->smba, SMBIOSIZE);
		kfree(adapdata);
		kfree(adap);
	}
}

static void piix4_remove(struct pci_dev *dev)
{
	if (piix4_main_adapter) {
		piix4_adap_remove(piix4_main_adapter);
		piix4_main_adapter = NULL;
	}

	if (piix4_aux_adapter) {
		piix4_adap_remove(piix4_aux_adapter);
		piix4_aux_adapter = NULL;
	}
}

static struct pci_driver piix4_driver = {
	.name		= "piix4_smbus",
	.id_table	= piix4_ids,
	.probe		= piix4_probe,
	.remove		= piix4_remove,
};

module_pci_driver(piix4_driver);

MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
		"Philip Edelbrock <phil@netroedge.com>");
MODULE_DESCRIPTION("PIIX4 SMBus driver");
MODULE_LICENSE("GPL");