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Linux 2.6.33-rc8
[linux-2.6/lguest.git] / drivers / i2c / busses / i2c-piix4.c
blobe56e4b6823ca24ac91d63a22f168e99564aac1d2
1 /*
2 Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl> and
3 Philip Edelbrock <phil@netroedge.com>
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19
20 /*
21 Supports:
22 Intel PIIX4, 440MX
23 Serverworks OSB4, CSB5, CSB6, HT-1000, HT-1100
24 ATI IXP200, IXP300, IXP400, SB600, SB700, SB800
25 AMD Hudson-2
26 SMSC Victory66
27
28 Note: we assume there can only be one device, with one SMBus interface.
29 */
30
31 #include <linux/module.h>
32 #include <linux/moduleparam.h>
33 #include <linux/pci.h>
34 #include <linux/kernel.h>
35 #include <linux/delay.h>
36 #include <linux/stddef.h>
37 #include <linux/ioport.h>
38 #include <linux/i2c.h>
39 #include <linux/init.h>
40 #include <linux/dmi.h>
41 #include <linux/acpi.h>
42 #include <asm/io.h>
43
44
45 /* PIIX4 SMBus address offsets */
46 #define SMBHSTSTS (0 + piix4_smba)
47 #define SMBHSLVSTS (1 + piix4_smba)
48 #define SMBHSTCNT (2 + piix4_smba)
49 #define SMBHSTCMD (3 + piix4_smba)
50 #define SMBHSTADD (4 + piix4_smba)
51 #define SMBHSTDAT0 (5 + piix4_smba)
52 #define SMBHSTDAT1 (6 + piix4_smba)
53 #define SMBBLKDAT (7 + piix4_smba)
54 #define SMBSLVCNT (8 + piix4_smba)
55 #define SMBSHDWCMD (9 + piix4_smba)
56 #define SMBSLVEVT (0xA + piix4_smba)
57 #define SMBSLVDAT (0xC + piix4_smba)
58
59 /* count for request_region */
60 #define SMBIOSIZE 8
61
62 /* PCI Address Constants */
63 #define SMBBA 0x090
64 #define SMBHSTCFG 0x0D2
65 #define SMBSLVC 0x0D3
66 #define SMBSHDW1 0x0D4
67 #define SMBSHDW2 0x0D5
68 #define SMBREV 0x0D6
69
70 /* Other settings */
71 #define MAX_TIMEOUT 500
72 #define ENABLE_INT9 0
73
74 /* PIIX4 constants */
75 #define PIIX4_QUICK 0x00
76 #define PIIX4_BYTE 0x04
77 #define PIIX4_BYTE_DATA 0x08
78 #define PIIX4_WORD_DATA 0x0C
79 #define PIIX4_BLOCK_DATA 0x14
80
81 /* insmod parameters */
82
83 /* If force is set to anything different from 0, we forcibly enable the
84 PIIX4. DANGEROUS! */
85 static int force;
86 module_param (force, int, 0);
87 MODULE_PARM_DESC(force, "Forcibly enable the PIIX4. DANGEROUS!");
88
89 /* If force_addr is set to anything different from 0, we forcibly enable
90 the PIIX4 at the given address. VERY DANGEROUS! */
91 static int force_addr;
92 module_param (force_addr, int, 0);
93 MODULE_PARM_DESC(force_addr,
94 "Forcibly enable the PIIX4 at the given address. "
95 "EXTREMELY DANGEROUS!");
96
97 static unsigned short piix4_smba;
98 static int srvrworks_csb5_delay;
99 static struct pci_driver piix4_driver;
100 static struct i2c_adapter piix4_adapter;
101
102 static struct dmi_system_id __devinitdata piix4_dmi_blacklist[] = {
103 {
104 .ident = "Sapphire AM2RD790",
105 .matches = {
106 DMI_MATCH(DMI_BOARD_VENDOR, "SAPPHIRE Inc."),
107 DMI_MATCH(DMI_BOARD_NAME, "PC-AM2RD790"),
108 },
109 },
110 {
111 .ident = "DFI Lanparty UT 790FX",
112 .matches = {
113 DMI_MATCH(DMI_BOARD_VENDOR, "DFI Inc."),
114 DMI_MATCH(DMI_BOARD_NAME, "LP UT 790FX"),
115 },
116 },
117 { }
118 };
119
120 /* The IBM entry is in a separate table because we only check it
121 on Intel-based systems */
122 static struct dmi_system_id __devinitdata piix4_dmi_ibm[] = {
123 {
124 .ident = "IBM",
125 .matches = { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
126 },
127 { },
128 };
129
130 static int __devinit piix4_setup(struct pci_dev *PIIX4_dev,
131 const struct pci_device_id *id)
132 {
133 unsigned char temp;
134
135 if ((PIIX4_dev->vendor == PCI_VENDOR_ID_SERVERWORKS) &&
136 (PIIX4_dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5))
137 srvrworks_csb5_delay = 1;
138
139 /* On some motherboards, it was reported that accessing the SMBus
140 caused severe hardware problems */
141 if (dmi_check_system(piix4_dmi_blacklist)) {
142 dev_err(&PIIX4_dev->dev,
143 "Accessing the SMBus on this system is unsafe!\n");
144 return -EPERM;
145 }
146
147 /* Don't access SMBus on IBM systems which get corrupted eeproms */
148 if (dmi_check_system(piix4_dmi_ibm) &&
149 PIIX4_dev->vendor == PCI_VENDOR_ID_INTEL) {
150 dev_err(&PIIX4_dev->dev, "IBM system detected; this module "
151 "may corrupt your serial eeprom! Refusing to load "
152 "module!\n");
153 return -EPERM;
154 }
155
156 /* Determine the address of the SMBus areas */
157 if (force_addr) {
158 piix4_smba = force_addr & 0xfff0;
159 force = 0;
160 } else {
161 pci_read_config_word(PIIX4_dev, SMBBA, &piix4_smba);
162 piix4_smba &= 0xfff0;
163 if(piix4_smba == 0) {
164 dev_err(&PIIX4_dev->dev, "SMBus base address "
165 "uninitialized - upgrade BIOS or use "
166 "force_addr=0xaddr\n");
167 return -ENODEV;
168 }
169 }
170
171 if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
172 return -ENODEV;
173
174 if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
175 dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
176 piix4_smba);
177 return -EBUSY;
178 }
179
180 pci_read_config_byte(PIIX4_dev, SMBHSTCFG, &temp);
181
182 /* If force_addr is set, we program the new address here. Just to make
183 sure, we disable the PIIX4 first. */
184 if (force_addr) {
185 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp & 0xfe);
186 pci_write_config_word(PIIX4_dev, SMBBA, piix4_smba);
187 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp | 0x01);
188 dev_info(&PIIX4_dev->dev, "WARNING: SMBus interface set to "
189 "new address %04x!\n", piix4_smba);
190 } else if ((temp & 1) == 0) {
191 if (force) {
192 /* This should never need to be done, but has been
193 * noted that many Dell machines have the SMBus
194 * interface on the PIIX4 disabled!? NOTE: This assumes
195 * I/O space and other allocations WERE done by the
196 * Bios! Don't complain if your hardware does weird
197 * things after enabling this. :') Check for Bios
198 * updates before resorting to this.
199 */
200 pci_write_config_byte(PIIX4_dev, SMBHSTCFG,
201 temp | 1);
202 dev_printk(KERN_NOTICE, &PIIX4_dev->dev,
203 "WARNING: SMBus interface has been "
204 "FORCEFULLY ENABLED!\n");
205 } else {
206 dev_err(&PIIX4_dev->dev,
207 "Host SMBus controller not enabled!\n");
208 release_region(piix4_smba, SMBIOSIZE);
209 piix4_smba = 0;
210 return -ENODEV;
211 }
212 }
213
214 if (((temp & 0x0E) == 8) || ((temp & 0x0E) == 2))
215 dev_dbg(&PIIX4_dev->dev, "Using Interrupt 9 for SMBus.\n");
216 else if ((temp & 0x0E) == 0)
217 dev_dbg(&PIIX4_dev->dev, "Using Interrupt SMI# for SMBus.\n");
218 else
219 dev_err(&PIIX4_dev->dev, "Illegal Interrupt configuration "
220 "(or code out of date)!\n");
221
222 pci_read_config_byte(PIIX4_dev, SMBREV, &temp);
223 dev_info(&PIIX4_dev->dev,
224 "SMBus Host Controller at 0x%x, revision %d\n",
225 piix4_smba, temp);
226
227 return 0;
228 }
229
230 static int __devinit piix4_setup_sb800(struct pci_dev *PIIX4_dev,
231 const struct pci_device_id *id)
232 {
233 unsigned short smba_idx = 0xcd6;
234 u8 smba_en_lo, smba_en_hi, i2ccfg, i2ccfg_offset = 0x10, smb_en = 0x2c;
235
236 /* SB800 and later SMBus does not support forcing address */
237 if (force || force_addr) {
238 dev_err(&PIIX4_dev->dev, "SMBus does not support "
239 "forcing address!\n");
240 return -EINVAL;
241 }
242
243 /* Determine the address of the SMBus areas */
244 if (!request_region(smba_idx, 2, "smba_idx")) {
245 dev_err(&PIIX4_dev->dev, "SMBus base address index region "
246 "0x%x already in use!\n", smba_idx);
247 return -EBUSY;
248 }
249 outb_p(smb_en, smba_idx);
250 smba_en_lo = inb_p(smba_idx + 1);
251 outb_p(smb_en + 1, smba_idx);
252 smba_en_hi = inb_p(smba_idx + 1);
253 release_region(smba_idx, 2);
254
255 if ((smba_en_lo & 1) == 0) {
256 dev_err(&PIIX4_dev->dev,
257 "Host SMBus controller not enabled!\n");
258 return -ENODEV;
259 }
260
261 piix4_smba = ((smba_en_hi << 8) | smba_en_lo) & 0xffe0;
262 if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
263 return -ENODEV;
264
265 if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
266 dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
267 piix4_smba);
268 return -EBUSY;
269 }
270
271 /* Request the SMBus I2C bus config region */
272 if (!request_region(piix4_smba + i2ccfg_offset, 1, "i2ccfg")) {
273 dev_err(&PIIX4_dev->dev, "SMBus I2C bus config region "
274 "0x%x already in use!\n", piix4_smba + i2ccfg_offset);
275 release_region(piix4_smba, SMBIOSIZE);
276 piix4_smba = 0;
277 return -EBUSY;
278 }
279 i2ccfg = inb_p(piix4_smba + i2ccfg_offset);
280 release_region(piix4_smba + i2ccfg_offset, 1);
281
282 if (i2ccfg & 1)
283 dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus.\n");
284 else
285 dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus.\n");
286
287 dev_info(&PIIX4_dev->dev,
288 "SMBus Host Controller at 0x%x, revision %d\n",
289 piix4_smba, i2ccfg >> 4);
290
291 return 0;
292 }
293
294 static int piix4_transaction(void)
295 {
296 int temp;
297 int result = 0;
298 int timeout = 0;
299
300 dev_dbg(&piix4_adapter.dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
301 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
302 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
303 inb_p(SMBHSTDAT1));
304
305 /* Make sure the SMBus host is ready to start transmitting */
306 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
307 dev_dbg(&piix4_adapter.dev, "SMBus busy (%02x). "
308 "Resetting...\n", temp);
309 outb_p(temp, SMBHSTSTS);
310 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
311 dev_err(&piix4_adapter.dev, "Failed! (%02x)\n", temp);
312 return -EBUSY;
313 } else {
314 dev_dbg(&piix4_adapter.dev, "Successful!\n");
315 }
316 }
317
318 /* start the transaction by setting bit 6 */
319 outb_p(inb(SMBHSTCNT) | 0x040, SMBHSTCNT);
320
321 /* We will always wait for a fraction of a second! (See PIIX4 docs errata) */
322 if (srvrworks_csb5_delay) /* Extra delay for SERVERWORKS_CSB5 */
323 msleep(2);
324 else
325 msleep(1);
326
327 while ((++timeout < MAX_TIMEOUT) &&
328 ((temp = inb_p(SMBHSTSTS)) & 0x01))
329 msleep(1);
330
331 /* If the SMBus is still busy, we give up */
332 if (timeout == MAX_TIMEOUT) {
333 dev_err(&piix4_adapter.dev, "SMBus Timeout!\n");
334 result = -ETIMEDOUT;
335 }
336
337 if (temp & 0x10) {
338 result = -EIO;
339 dev_err(&piix4_adapter.dev, "Error: Failed bus transaction\n");
340 }
341
342 if (temp & 0x08) {
343 result = -EIO;
344 dev_dbg(&piix4_adapter.dev, "Bus collision! SMBus may be "
345 "locked until next hard reset. (sorry!)\n");
346 /* Clock stops and slave is stuck in mid-transmission */
347 }
348
349 if (temp & 0x04) {
350 result = -ENXIO;
351 dev_dbg(&piix4_adapter.dev, "Error: no response!\n");
352 }
353
354 if (inb_p(SMBHSTSTS) != 0x00)
355 outb_p(inb(SMBHSTSTS), SMBHSTSTS);
356
357 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
358 dev_err(&piix4_adapter.dev, "Failed reset at end of "
359 "transaction (%02x)\n", temp);
360 }
361 dev_dbg(&piix4_adapter.dev, "Transaction (post): CNT=%02x, CMD=%02x, "
362 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
363 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
364 inb_p(SMBHSTDAT1));
365 return result;
366 }
367
368 /* Return negative errno on error. */
369 static s32 piix4_access(struct i2c_adapter * adap, u16 addr,
370 unsigned short flags, char read_write,
371 u8 command, int size, union i2c_smbus_data * data)
372 {
373 int i, len;
374 int status;
375
376 switch (size) {
377 case I2C_SMBUS_QUICK:
378 outb_p((addr << 1) | read_write,
379 SMBHSTADD);
380 size = PIIX4_QUICK;
381 break;
382 case I2C_SMBUS_BYTE:
383 outb_p((addr << 1) | read_write,
384 SMBHSTADD);
385 if (read_write == I2C_SMBUS_WRITE)
386 outb_p(command, SMBHSTCMD);
387 size = PIIX4_BYTE;
388 break;
389 case I2C_SMBUS_BYTE_DATA:
390 outb_p((addr << 1) | read_write,
391 SMBHSTADD);
392 outb_p(command, SMBHSTCMD);
393 if (read_write == I2C_SMBUS_WRITE)
394 outb_p(data->byte, SMBHSTDAT0);
395 size = PIIX4_BYTE_DATA;
396 break;
397 case I2C_SMBUS_WORD_DATA:
398 outb_p((addr << 1) | read_write,
399 SMBHSTADD);
400 outb_p(command, SMBHSTCMD);
401 if (read_write == I2C_SMBUS_WRITE) {
402 outb_p(data->word & 0xff, SMBHSTDAT0);
403 outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
404 }
405 size = PIIX4_WORD_DATA;
406 break;
407 case I2C_SMBUS_BLOCK_DATA:
408 outb_p((addr << 1) | read_write,
409 SMBHSTADD);
410 outb_p(command, SMBHSTCMD);
411 if (read_write == I2C_SMBUS_WRITE) {
412 len = data->block[0];
413 if (len == 0 || len > I2C_SMBUS_BLOCK_MAX)
414 return -EINVAL;
415 outb_p(len, SMBHSTDAT0);
416 i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
417 for (i = 1; i <= len; i++)
418 outb_p(data->block[i], SMBBLKDAT);
419 }
420 size = PIIX4_BLOCK_DATA;
421 break;
422 default:
423 dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
424 return -EOPNOTSUPP;
425 }
426
427 outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT);
428
429 status = piix4_transaction();
430 if (status)
431 return status;
432
433 if ((read_write == I2C_SMBUS_WRITE) || (size == PIIX4_QUICK))
434 return 0;
435
436
437 switch (size) {
438 case PIIX4_BYTE:
439 case PIIX4_BYTE_DATA:
440 data->byte = inb_p(SMBHSTDAT0);
441 break;
442 case PIIX4_WORD_DATA:
443 data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
444 break;
445 case PIIX4_BLOCK_DATA:
446 data->block[0] = inb_p(SMBHSTDAT0);
447 if (data->block[0] == 0 || data->block[0] > I2C_SMBUS_BLOCK_MAX)
448 return -EPROTO;
449 i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
450 for (i = 1; i <= data->block[0]; i++)
451 data->block[i] = inb_p(SMBBLKDAT);
452 break;
453 }
454 return 0;
455 }
456
457 static u32 piix4_func(struct i2c_adapter *adapter)
458 {
459 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
460 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
461 I2C_FUNC_SMBUS_BLOCK_DATA;
462 }
463
464 static const struct i2c_algorithm smbus_algorithm = {
465 .smbus_xfer = piix4_access,
466 .functionality = piix4_func,
467 };
468
469 static struct i2c_adapter piix4_adapter = {
470 .owner = THIS_MODULE,
471 .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
472 .algo = &smbus_algorithm,
473 };
474
475 static struct pci_device_id piix4_ids[] = {
476 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3) },
477 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443MX_3) },
478 { PCI_DEVICE(PCI_VENDOR_ID_EFAR, PCI_DEVICE_ID_EFAR_SLC90E66_3) },
479 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP200_SMBUS) },
480 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP300_SMBUS) },
481 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS) },
482 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS) },
483 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_HUDSON2_SMBUS) },
484 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
485 PCI_DEVICE_ID_SERVERWORKS_OSB4) },
486 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
487 PCI_DEVICE_ID_SERVERWORKS_CSB5) },
488 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
489 PCI_DEVICE_ID_SERVERWORKS_CSB6) },
490 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
491 PCI_DEVICE_ID_SERVERWORKS_HT1000SB) },
492 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
493 PCI_DEVICE_ID_SERVERWORKS_HT1100LD) },
494 { 0, }
495 };
496
497 MODULE_DEVICE_TABLE (pci, piix4_ids);
498
499 static int __devinit piix4_probe(struct pci_dev *dev,
500 const struct pci_device_id *id)
501 {
502 int retval;
503
504 if ((dev->vendor == PCI_VENDOR_ID_ATI &&
505 dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
506 dev->revision >= 0x40) ||
507 dev->vendor == PCI_VENDOR_ID_AMD)
508 /* base address location etc changed in SB800 */
509 retval = piix4_setup_sb800(dev, id);
510 else
511 retval = piix4_setup(dev, id);
512
513 if (retval)
514 return retval;
515
516 /* set up the sysfs linkage to our parent device */
517 piix4_adapter.dev.parent = &dev->dev;
518
519 snprintf(piix4_adapter.name, sizeof(piix4_adapter.name),
520 "SMBus PIIX4 adapter at %04x", piix4_smba);
521
522 if ((retval = i2c_add_adapter(&piix4_adapter))) {
523 dev_err(&dev->dev, "Couldn't register adapter!\n");
524 release_region(piix4_smba, SMBIOSIZE);
525 piix4_smba = 0;
526 }
527
528 return retval;
529 }
530
531 static void __devexit piix4_remove(struct pci_dev *dev)
532 {
533 if (piix4_smba) {
534 i2c_del_adapter(&piix4_adapter);
535 release_region(piix4_smba, SMBIOSIZE);
536 piix4_smba = 0;
537 }
538 }
539
540 static struct pci_driver piix4_driver = {
541 .name = "piix4_smbus",
542 .id_table = piix4_ids,
543 .probe = piix4_probe,
544 .remove = __devexit_p(piix4_remove),
545 };
546
547 static int __init i2c_piix4_init(void)
548 {
549 return pci_register_driver(&piix4_driver);
550 }
551
552 static void __exit i2c_piix4_exit(void)
553 {
554 pci_unregister_driver(&piix4_driver);
555 }
556
557 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
558 "Philip Edelbrock <phil@netroedge.com>");
559 MODULE_DESCRIPTION("PIIX4 SMBus driver");
560 MODULE_LICENSE("GPL");
561
562 module_init(i2c_piix4_init);
563 module_exit(i2c_piix4_exit);
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