blob: 03bcd07c4697721b35810bf0b379465baffd23f2 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 Copyright (c) 1999-2002 Merlin Hughes <merlin@merlin.org>
3
4 Shamelessly ripped from i2c-piix4.c:
5
6 Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
7 Philip Edelbrock <phil@netroedge.com>
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22*/
23
24/*
25 2002-04-08: Added nForce support. (Csaba Halasz)
26 2002-10-03: Fixed nForce PnP I/O port. (Michael Steil)
27 2002-12-28: Rewritten into something that resembles a Linux driver (hch)
28 2003-11-29: Added back AMD8111 removed by the previous rewrite.
29 (Philip Pokorny)
30*/
31
32/*
33 Supports AMD756, AMD766, AMD768, AMD8111 and nVidia nForce
34 Note: we assume there can only be one device, with one SMBus interface.
35*/
36
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <linux/module.h>
38#include <linux/pci.h>
39#include <linux/kernel.h>
40#include <linux/delay.h>
41#include <linux/stddef.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <linux/ioport.h>
43#include <linux/i2c.h>
44#include <linux/init.h>
Jean Delvare54fb4a052008-07-14 22:38:33 +020045#include <linux/acpi.h>
H Hartley Sweeten21782182010-05-21 18:41:01 +020046#include <linux/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48/* AMD756 SMBus address offsets */
49#define SMB_ADDR_OFFSET 0xE0
50#define SMB_IOSIZE 16
51#define SMB_GLOBAL_STATUS (0x0 + amd756_ioport)
52#define SMB_GLOBAL_ENABLE (0x2 + amd756_ioport)
53#define SMB_HOST_ADDRESS (0x4 + amd756_ioport)
54#define SMB_HOST_DATA (0x6 + amd756_ioport)
55#define SMB_HOST_COMMAND (0x8 + amd756_ioport)
56#define SMB_HOST_BLOCK_DATA (0x9 + amd756_ioport)
57#define SMB_HAS_DATA (0xA + amd756_ioport)
58#define SMB_HAS_DEVICE_ADDRESS (0xC + amd756_ioport)
59#define SMB_HAS_HOST_ADDRESS (0xE + amd756_ioport)
60#define SMB_SNOOP_ADDRESS (0xF + amd756_ioport)
61
62/* PCI Address Constants */
63
64/* address of I/O space */
65#define SMBBA 0x058 /* mh */
66#define SMBBANFORCE 0x014
67
68/* general configuration */
69#define SMBGCFG 0x041 /* mh */
70
71/* silicon revision code */
72#define SMBREV 0x008
73
74/* Other settings */
75#define MAX_TIMEOUT 500
76
77/* AMD756 constants */
78#define AMD756_QUICK 0x00
79#define AMD756_BYTE 0x01
80#define AMD756_BYTE_DATA 0x02
81#define AMD756_WORD_DATA 0x03
82#define AMD756_PROCESS_CALL 0x04
83#define AMD756_BLOCK_DATA 0x05
84
Jean Delvared6072f82005-09-25 16:37:04 +020085static struct pci_driver amd756_driver;
Jean Delvare60507092005-09-25 16:23:07 +020086static unsigned short amd756_ioport;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88/*
89 SMBUS event = I/O 28-29 bit 11
90 see E0 for the status bits and enabled in E2
91
92*/
93#define GS_ABRT_STS (1 << 0)
94#define GS_COL_STS (1 << 1)
95#define GS_PRERR_STS (1 << 2)
96#define GS_HST_STS (1 << 3)
97#define GS_HCYC_STS (1 << 4)
98#define GS_TO_STS (1 << 5)
99#define GS_SMB_STS (1 << 11)
100
101#define GS_CLEAR_STS (GS_ABRT_STS | GS_COL_STS | GS_PRERR_STS | \
102 GS_HCYC_STS | GS_TO_STS )
103
104#define GE_CYC_TYPE_MASK (7)
105#define GE_HOST_STC (1 << 3)
106#define GE_ABORT (1 << 5)
107
108
109static int amd756_transaction(struct i2c_adapter *adap)
110{
111 int temp;
112 int result = 0;
113 int timeout = 0;
114
115 dev_dbg(&adap->dev, "Transaction (pre): GS=%04x, GE=%04x, ADD=%04x, "
116 "DAT=%04x\n", inw_p(SMB_GLOBAL_STATUS),
117 inw_p(SMB_GLOBAL_ENABLE), inw_p(SMB_HOST_ADDRESS),
118 inb_p(SMB_HOST_DATA));
119
120 /* Make sure the SMBus host is ready to start transmitting */
121 if ((temp = inw_p(SMB_GLOBAL_STATUS)) & (GS_HST_STS | GS_SMB_STS)) {
122 dev_dbg(&adap->dev, "SMBus busy (%04x). Waiting...\n", temp);
123 do {
124 msleep(1);
125 temp = inw_p(SMB_GLOBAL_STATUS);
126 } while ((temp & (GS_HST_STS | GS_SMB_STS)) &&
127 (timeout++ < MAX_TIMEOUT));
128 /* If the SMBus is still busy, we give up */
Roel Kluin4ccc28f2009-05-05 08:39:24 +0200129 if (timeout > MAX_TIMEOUT) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 dev_dbg(&adap->dev, "Busy wait timeout (%04x)\n", temp);
131 goto abort;
132 }
133 timeout = 0;
134 }
135
136 /* start the transaction by setting the start bit */
137 outw_p(inw(SMB_GLOBAL_ENABLE) | GE_HOST_STC, SMB_GLOBAL_ENABLE);
138
139 /* We will always wait for a fraction of a second! */
140 do {
141 msleep(1);
142 temp = inw_p(SMB_GLOBAL_STATUS);
143 } while ((temp & GS_HST_STS) && (timeout++ < MAX_TIMEOUT));
144
145 /* If the SMBus is still busy, we give up */
Roel Kluin4ccc28f2009-05-05 08:39:24 +0200146 if (timeout > MAX_TIMEOUT) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 dev_dbg(&adap->dev, "Completion timeout!\n");
148 goto abort;
149 }
150
151 if (temp & GS_PRERR_STS) {
David Brownell97140342008-07-14 22:38:25 +0200152 result = -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 dev_dbg(&adap->dev, "SMBus Protocol error (no response)!\n");
154 }
155
156 if (temp & GS_COL_STS) {
David Brownell97140342008-07-14 22:38:25 +0200157 result = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 dev_warn(&adap->dev, "SMBus collision!\n");
159 }
160
161 if (temp & GS_TO_STS) {
David Brownell97140342008-07-14 22:38:25 +0200162 result = -ETIMEDOUT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 dev_dbg(&adap->dev, "SMBus protocol timeout!\n");
164 }
165
166 if (temp & GS_HCYC_STS)
167 dev_dbg(&adap->dev, "SMBus protocol success!\n");
168
169 outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);
170
171#ifdef DEBUG
172 if (((temp = inw_p(SMB_GLOBAL_STATUS)) & GS_CLEAR_STS) != 0x00) {
173 dev_dbg(&adap->dev,
174 "Failed reset at end of transaction (%04x)\n", temp);
175 }
176#endif
177
178 dev_dbg(&adap->dev,
179 "Transaction (post): GS=%04x, GE=%04x, ADD=%04x, DAT=%04x\n",
180 inw_p(SMB_GLOBAL_STATUS), inw_p(SMB_GLOBAL_ENABLE),
181 inw_p(SMB_HOST_ADDRESS), inb_p(SMB_HOST_DATA));
182
183 return result;
184
185 abort:
186 dev_warn(&adap->dev, "Sending abort\n");
187 outw_p(inw(SMB_GLOBAL_ENABLE) | GE_ABORT, SMB_GLOBAL_ENABLE);
188 msleep(100);
189 outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);
David Brownell97140342008-07-14 22:38:25 +0200190 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191}
192
David Brownell97140342008-07-14 22:38:25 +0200193/* Return negative errno on error. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194static s32 amd756_access(struct i2c_adapter * adap, u16 addr,
195 unsigned short flags, char read_write,
196 u8 command, int size, union i2c_smbus_data * data)
197{
198 int i, len;
David Brownell97140342008-07-14 22:38:25 +0200199 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 switch (size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 case I2C_SMBUS_QUICK:
203 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
204 SMB_HOST_ADDRESS);
205 size = AMD756_QUICK;
206 break;
207 case I2C_SMBUS_BYTE:
208 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
209 SMB_HOST_ADDRESS);
210 if (read_write == I2C_SMBUS_WRITE)
211 outb_p(command, SMB_HOST_DATA);
212 size = AMD756_BYTE;
213 break;
214 case I2C_SMBUS_BYTE_DATA:
215 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
216 SMB_HOST_ADDRESS);
217 outb_p(command, SMB_HOST_COMMAND);
218 if (read_write == I2C_SMBUS_WRITE)
219 outw_p(data->byte, SMB_HOST_DATA);
220 size = AMD756_BYTE_DATA;
221 break;
222 case I2C_SMBUS_WORD_DATA:
223 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
224 SMB_HOST_ADDRESS);
225 outb_p(command, SMB_HOST_COMMAND);
226 if (read_write == I2C_SMBUS_WRITE)
227 outw_p(data->word, SMB_HOST_DATA); /* TODO: endian???? */
228 size = AMD756_WORD_DATA;
229 break;
230 case I2C_SMBUS_BLOCK_DATA:
231 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
232 SMB_HOST_ADDRESS);
233 outb_p(command, SMB_HOST_COMMAND);
234 if (read_write == I2C_SMBUS_WRITE) {
235 len = data->block[0];
236 if (len < 0)
237 len = 0;
238 if (len > 32)
239 len = 32;
240 outw_p(len, SMB_HOST_DATA);
241 /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */
242 for (i = 1; i <= len; i++)
243 outb_p(data->block[i],
244 SMB_HOST_BLOCK_DATA);
245 }
246 size = AMD756_BLOCK_DATA;
247 break;
Jean Delvareac7fc4f2008-07-14 22:38:25 +0200248 default:
249 dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
250 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 }
252
253 /* How about enabling interrupts... */
254 outw_p(size & GE_CYC_TYPE_MASK, SMB_GLOBAL_ENABLE);
255
David Brownell97140342008-07-14 22:38:25 +0200256 status = amd756_transaction(adap);
257 if (status)
258 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
260 if ((read_write == I2C_SMBUS_WRITE) || (size == AMD756_QUICK))
261 return 0;
262
263
264 switch (size) {
265 case AMD756_BYTE:
266 data->byte = inw_p(SMB_HOST_DATA);
267 break;
268 case AMD756_BYTE_DATA:
269 data->byte = inw_p(SMB_HOST_DATA);
270 break;
271 case AMD756_WORD_DATA:
272 data->word = inw_p(SMB_HOST_DATA); /* TODO: endian???? */
273 break;
274 case AMD756_BLOCK_DATA:
275 data->block[0] = inw_p(SMB_HOST_DATA) & 0x3f;
276 if(data->block[0] > 32)
277 data->block[0] = 32;
278 /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */
279 for (i = 1; i <= data->block[0]; i++)
280 data->block[i] = inb_p(SMB_HOST_BLOCK_DATA);
281 break;
282 }
283
284 return 0;
285}
286
287static u32 amd756_func(struct i2c_adapter *adapter)
288{
289 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
290 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
Jean Delvare875b0a42008-05-18 20:49:41 +0200291 I2C_FUNC_SMBUS_BLOCK_DATA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292}
293
Jean Delvare8f9082c2006-09-03 22:39:46 +0200294static const struct i2c_algorithm smbus_algorithm = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 .smbus_xfer = amd756_access,
296 .functionality = amd756_func,
297};
298
299struct i2c_adapter amd756_smbus = {
300 .owner = THIS_MODULE,
Jean Delvare3401b2f2008-07-14 22:38:29 +0200301 .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 .algo = &smbus_algorithm,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303};
304
305enum chiptype { AMD756, AMD766, AMD768, NFORCE, AMD8111 };
306static const char* chipname[] = {
307 "AMD756", "AMD766", "AMD768",
308 "nVidia nForce", "AMD8111",
309};
310
Márton Németh4111ecd2010-03-02 12:23:37 +0100311static const struct pci_device_id amd756_ids[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_740B),
313 .driver_data = AMD756 },
314 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7413),
315 .driver_data = AMD766 },
316 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_OPUS_7443),
317 .driver_data = AMD768 },
318 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS),
319 .driver_data = AMD8111 },
320 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_SMBUS),
321 .driver_data = NFORCE },
322 { 0, }
323};
324
325MODULE_DEVICE_TABLE (pci, amd756_ids);
326
327static int __devinit amd756_probe(struct pci_dev *pdev,
328 const struct pci_device_id *id)
329{
330 int nforce = (id->driver_data == NFORCE);
331 int error;
332 u8 temp;
333
334 if (amd756_ioport) {
335 dev_err(&pdev->dev, "Only one device supported "
336 "(you have a strange motherboard, btw)\n");
337 return -ENODEV;
338 }
339
340 if (nforce) {
341 if (PCI_FUNC(pdev->devfn) != 1)
342 return -ENODEV;
343
344 pci_read_config_word(pdev, SMBBANFORCE, &amd756_ioport);
345 amd756_ioport &= 0xfffc;
346 } else { /* amd */
347 if (PCI_FUNC(pdev->devfn) != 3)
348 return -ENODEV;
349
350 pci_read_config_byte(pdev, SMBGCFG, &temp);
351 if ((temp & 128) == 0) {
352 dev_err(&pdev->dev,
353 "Error: SMBus controller I/O not enabled!\n");
354 return -ENODEV;
355 }
356
357 /* Determine the address of the SMBus areas */
358 /* Technically it is a dword but... */
359 pci_read_config_word(pdev, SMBBA, &amd756_ioport);
360 amd756_ioport &= 0xff00;
361 amd756_ioport += SMB_ADDR_OFFSET;
362 }
363
Jean Delvare54fb4a052008-07-14 22:38:33 +0200364 error = acpi_check_region(amd756_ioport, SMB_IOSIZE,
365 amd756_driver.name);
366 if (error)
Jean Delvare18669ea2009-10-04 22:53:45 +0200367 return -ENODEV;
Jean Delvare54fb4a052008-07-14 22:38:33 +0200368
Jean Delvared6072f82005-09-25 16:37:04 +0200369 if (!request_region(amd756_ioport, SMB_IOSIZE, amd756_driver.name)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 dev_err(&pdev->dev, "SMB region 0x%x already in use!\n",
371 amd756_ioport);
372 return -ENODEV;
373 }
374
375 pci_read_config_byte(pdev, SMBREV, &temp);
376 dev_dbg(&pdev->dev, "SMBREV = 0x%X\n", temp);
377 dev_dbg(&pdev->dev, "AMD756_smba = 0x%X\n", amd756_ioport);
378
Robert P. J. Day405ae7d2007-02-17 19:13:42 +0100379 /* set up the sysfs linkage to our parent device */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 amd756_smbus.dev.parent = &pdev->dev;
381
Jean Delvare66c7acf2009-01-07 14:29:18 +0100382 snprintf(amd756_smbus.name, sizeof(amd756_smbus.name),
383 "SMBus %s adapter at %04x", chipname[id->driver_data],
384 amd756_ioport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
386 error = i2c_add_adapter(&amd756_smbus);
387 if (error) {
388 dev_err(&pdev->dev,
389 "Adapter registration failed, module not inserted\n");
390 goto out_err;
391 }
392
393 return 0;
394
395 out_err:
396 release_region(amd756_ioport, SMB_IOSIZE);
397 return error;
398}
399
400static void __devexit amd756_remove(struct pci_dev *dev)
401{
402 i2c_del_adapter(&amd756_smbus);
403 release_region(amd756_ioport, SMB_IOSIZE);
404}
405
406static struct pci_driver amd756_driver = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 .name = "amd756_smbus",
408 .id_table = amd756_ids,
409 .probe = amd756_probe,
410 .remove = __devexit_p(amd756_remove),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411};
412
413static int __init amd756_init(void)
414{
415 return pci_register_driver(&amd756_driver);
416}
417
418static void __exit amd756_exit(void)
419{
420 pci_unregister_driver(&amd756_driver);
421}
422
423MODULE_AUTHOR("Merlin Hughes <merlin@merlin.org>");
424MODULE_DESCRIPTION("AMD756/766/768/8111 and nVidia nForce SMBus driver");
425MODULE_LICENSE("GPL");
426
427EXPORT_SYMBOL(amd756_smbus);
428
429module_init(amd756_init)
430module_exit(amd756_exit)