blob: f320ab27da463ae26b4d2ed078d250fa7c72d2c9 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 Copyright (c) 1998, 1999 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/* Note: we assume there can only be one SIS5595 with one SMBus interface */
21
22/*
23 Note: all have mfr. ID 0x1039.
24 SUPPORTED PCI ID
25 5595 0008
26
27 Note: these chips contain a 0008 device which is incompatible with the
28 5595. We recognize these by the presence of the listed
29 "blacklist" PCI ID and refuse to load.
30
31 NOT SUPPORTED PCI ID BLACKLIST PCI ID
32 540 0008 0540
33 550 0008 0550
34 5513 0008 5511
35 5581 0008 5597
36 5582 0008 5597
37 5597 0008 5597
38 5598 0008 5597/5598
39 630 0008 0630
40 645 0008 0645
41 646 0008 0646
42 648 0008 0648
43 650 0008 0650
44 651 0008 0651
45 730 0008 0730
46 735 0008 0735
47 745 0008 0745
48 746 0008 0746
49*/
50
51/* TO DO:
52 * Add Block Transfers (ugly, but supported by the adapter)
53 * Add adapter resets
54 */
55
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include <linux/kernel.h>
57#include <linux/module.h>
58#include <linux/delay.h>
59#include <linux/pci.h>
60#include <linux/ioport.h>
61#include <linux/init.h>
62#include <linux/i2c.h>
Jean Delvare54fb4a052008-07-14 22:38:33 +020063#include <linux/acpi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#include <asm/io.h>
65
66static int blacklist[] = {
67 PCI_DEVICE_ID_SI_540,
68 PCI_DEVICE_ID_SI_550,
69 PCI_DEVICE_ID_SI_630,
70 PCI_DEVICE_ID_SI_645,
71 PCI_DEVICE_ID_SI_646,
72 PCI_DEVICE_ID_SI_648,
73 PCI_DEVICE_ID_SI_650,
74 PCI_DEVICE_ID_SI_651,
75 PCI_DEVICE_ID_SI_730,
76 PCI_DEVICE_ID_SI_735,
77 PCI_DEVICE_ID_SI_745,
78 PCI_DEVICE_ID_SI_746,
79 PCI_DEVICE_ID_SI_5511, /* 5513 chip has the 0008 device but that ID
80 shows up in other chips so we use the 5511
81 ID for recognition */
82 PCI_DEVICE_ID_SI_5597,
83 PCI_DEVICE_ID_SI_5598,
84 0, /* terminates the list */
85};
86
87/* Length of ISA address segment */
88#define SIS5595_EXTENT 8
89/* SIS5595 SMBus registers */
90#define SMB_STS_LO 0x00
91#define SMB_STS_HI 0x01
92#define SMB_CTL_LO 0x02
93#define SMB_CTL_HI 0x03
94#define SMB_ADDR 0x04
95#define SMB_CMD 0x05
96#define SMB_PCNT 0x06
97#define SMB_CNT 0x07
98#define SMB_BYTE 0x08
99#define SMB_DEV 0x10
100#define SMB_DB0 0x11
101#define SMB_DB1 0x12
102#define SMB_HAA 0x13
103
104/* PCI Address Constants */
105#define SMB_INDEX 0x38
106#define SMB_DAT 0x39
107#define SIS5595_ENABLE_REG 0x40
108#define ACPI_BASE 0x90
109
110/* Other settings */
111#define MAX_TIMEOUT 500
112
113/* SIS5595 constants */
114#define SIS5595_QUICK 0x00
115#define SIS5595_BYTE 0x02
116#define SIS5595_BYTE_DATA 0x04
117#define SIS5595_WORD_DATA 0x06
118#define SIS5595_PROC_CALL 0x08
119#define SIS5595_BLOCK_DATA 0x0A
120
121/* insmod parameters */
122
123/* If force_addr is set to anything different from 0, we forcibly enable
124 the device at the given address. */
Jean Delvare60507092005-09-25 16:23:07 +0200125static u16 force_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126module_param(force_addr, ushort, 0);
127MODULE_PARM_DESC(force_addr, "Initialize the base address of the i2c controller");
128
Jean Delvared6072f82005-09-25 16:37:04 +0200129static struct pci_driver sis5595_driver;
Jean Delvare60507092005-09-25 16:23:07 +0200130static unsigned short sis5595_base;
Jean Delvare7375cd82007-07-12 14:12:30 +0200131static struct pci_dev *sis5595_pdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
133static u8 sis5595_read(u8 reg)
134{
135 outb(reg, sis5595_base + SMB_INDEX);
136 return inb(sis5595_base + SMB_DAT);
137}
138
139static void sis5595_write(u8 reg, u8 data)
140{
141 outb(reg, sis5595_base + SMB_INDEX);
142 outb(data, sis5595_base + SMB_DAT);
143}
144
145static int sis5595_setup(struct pci_dev *SIS5595_dev)
146{
147 u16 a;
148 u8 val;
149 int *i;
150 int retval = -ENODEV;
151
152 /* Look for imposters */
153 for (i = blacklist; *i != 0; i++) {
154 struct pci_dev *dev;
155 dev = pci_get_device(PCI_VENDOR_ID_SI, *i, NULL);
156 if (dev) {
157 dev_err(&SIS5595_dev->dev, "Looked for SIS5595 but found unsupported device %.4x\n", *i);
158 pci_dev_put(dev);
159 return -ENODEV;
160 }
161 }
162
163 /* Determine the address of the SMBus areas */
164 pci_read_config_word(SIS5595_dev, ACPI_BASE, &sis5595_base);
165 if (sis5595_base == 0 && force_addr == 0) {
166 dev_err(&SIS5595_dev->dev, "ACPI base address uninitialized - upgrade BIOS or use force_addr=0xaddr\n");
167 return -ENODEV;
168 }
169
170 if (force_addr)
171 sis5595_base = force_addr & ~(SIS5595_EXTENT - 1);
172 dev_dbg(&SIS5595_dev->dev, "ACPI Base address: %04x\n", sis5595_base);
173
174 /* NB: We grab just the two SMBus registers here, but this may still
175 * interfere with ACPI :-( */
Jean Delvare54fb4a052008-07-14 22:38:33 +0200176 retval = acpi_check_region(sis5595_base + SMB_INDEX, 2,
177 sis5595_driver.name);
178 if (retval)
179 return retval;
180
Jean Delvared6072f82005-09-25 16:37:04 +0200181 if (!request_region(sis5595_base + SMB_INDEX, 2,
182 sis5595_driver.name)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 dev_err(&SIS5595_dev->dev, "SMBus registers 0x%04x-0x%04x already in use!\n",
184 sis5595_base + SMB_INDEX, sis5595_base + SMB_INDEX + 1);
185 return -ENODEV;
186 }
187
188 if (force_addr) {
189 dev_info(&SIS5595_dev->dev, "forcing ISA address 0x%04X\n", sis5595_base);
190 if (pci_write_config_word(SIS5595_dev, ACPI_BASE, sis5595_base)
191 != PCIBIOS_SUCCESSFUL)
192 goto error;
193 if (pci_read_config_word(SIS5595_dev, ACPI_BASE, &a)
194 != PCIBIOS_SUCCESSFUL)
195 goto error;
196 if ((a & ~(SIS5595_EXTENT - 1)) != sis5595_base) {
197 /* doesn't work for some chips! */
198 dev_err(&SIS5595_dev->dev, "force address failed - not supported?\n");
199 goto error;
200 }
201 }
202
203 if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
204 != PCIBIOS_SUCCESSFUL)
205 goto error;
206 if ((val & 0x80) == 0) {
207 dev_info(&SIS5595_dev->dev, "enabling ACPI\n");
208 if (pci_write_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, val | 0x80)
209 != PCIBIOS_SUCCESSFUL)
210 goto error;
211 if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
212 != PCIBIOS_SUCCESSFUL)
213 goto error;
214 if ((val & 0x80) == 0) {
215 /* doesn't work for some chips? */
216 dev_err(&SIS5595_dev->dev, "ACPI enable failed - not supported?\n");
217 goto error;
218 }
219 }
220
221 /* Everything is happy */
222 return 0;
223
224error:
225 release_region(sis5595_base + SMB_INDEX, 2);
226 return retval;
227}
228
229static int sis5595_transaction(struct i2c_adapter *adap)
230{
231 int temp;
232 int result = 0;
233 int timeout = 0;
234
235 /* Make sure the SMBus host is ready to start transmitting */
236 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
237 if (temp != 0x00) {
Jean Delvare541e6a02005-06-23 22:18:08 +0200238 dev_dbg(&adap->dev, "SMBus busy (%04x). Resetting...\n", temp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 sis5595_write(SMB_STS_LO, temp & 0xff);
240 sis5595_write(SMB_STS_HI, temp >> 8);
241 if ((temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8)) != 0x00) {
242 dev_dbg(&adap->dev, "Failed! (%02x)\n", temp);
David Brownell97140342008-07-14 22:38:25 +0200243 return -EBUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 } else {
Jean Delvarec5d21b72008-04-29 23:11:37 +0200245 dev_dbg(&adap->dev, "Successful!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 }
247 }
248
249 /* start the transaction by setting bit 4 */
250 sis5595_write(SMB_CTL_LO, sis5595_read(SMB_CTL_LO) | 0x10);
251
252 /* We will always wait for a fraction of a second! */
253 do {
254 msleep(1);
255 temp = sis5595_read(SMB_STS_LO);
256 } while (!(temp & 0x40) && (timeout++ < MAX_TIMEOUT));
257
258 /* If the SMBus is still busy, we give up */
259 if (timeout >= MAX_TIMEOUT) {
260 dev_dbg(&adap->dev, "SMBus Timeout!\n");
David Brownell97140342008-07-14 22:38:25 +0200261 result = -ETIMEDOUT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 }
263
264 if (temp & 0x10) {
265 dev_dbg(&adap->dev, "Error: Failed bus transaction\n");
David Brownell97140342008-07-14 22:38:25 +0200266 result = -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 }
268
269 if (temp & 0x20) {
270 dev_err(&adap->dev, "Bus collision! SMBus may be locked until "
271 "next hard reset (or not...)\n");
272 /* Clock stops and slave is stuck in mid-transmission */
David Brownell97140342008-07-14 22:38:25 +0200273 result = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 }
275
276 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
277 if (temp != 0x00) {
278 sis5595_write(SMB_STS_LO, temp & 0xff);
279 sis5595_write(SMB_STS_HI, temp >> 8);
280 }
281
282 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
283 if (temp != 0x00)
284 dev_dbg(&adap->dev, "Failed reset at end of transaction (%02x)\n", temp);
285
286 return result;
287}
288
David Brownell97140342008-07-14 22:38:25 +0200289/* Return negative errno on error. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290static s32 sis5595_access(struct i2c_adapter *adap, u16 addr,
291 unsigned short flags, char read_write,
292 u8 command, int size, union i2c_smbus_data *data)
293{
David Brownell97140342008-07-14 22:38:25 +0200294 int status;
295
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 switch (size) {
297 case I2C_SMBUS_QUICK:
298 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
299 size = SIS5595_QUICK;
300 break;
301 case I2C_SMBUS_BYTE:
302 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
303 if (read_write == I2C_SMBUS_WRITE)
304 sis5595_write(SMB_CMD, command);
305 size = SIS5595_BYTE;
306 break;
307 case I2C_SMBUS_BYTE_DATA:
308 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
309 sis5595_write(SMB_CMD, command);
310 if (read_write == I2C_SMBUS_WRITE)
311 sis5595_write(SMB_BYTE, data->byte);
312 size = SIS5595_BYTE_DATA;
313 break;
314 case I2C_SMBUS_PROC_CALL:
315 case I2C_SMBUS_WORD_DATA:
316 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
317 sis5595_write(SMB_CMD, command);
318 if (read_write == I2C_SMBUS_WRITE) {
319 sis5595_write(SMB_BYTE, data->word & 0xff);
320 sis5595_write(SMB_BYTE + 1,
321 (data->word & 0xff00) >> 8);
322 }
323 size = (size == I2C_SMBUS_PROC_CALL) ? SIS5595_PROC_CALL : SIS5595_WORD_DATA;
324 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 default:
Jean Delvare1842cc22008-04-29 23:11:38 +0200326 dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
David Brownell97140342008-07-14 22:38:25 +0200327 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 }
329
330 sis5595_write(SMB_CTL_LO, ((size & 0x0E)));
331
David Brownell97140342008-07-14 22:38:25 +0200332 status = sis5595_transaction(adap);
333 if (status)
334 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
336 if ((size != SIS5595_PROC_CALL) &&
337 ((read_write == I2C_SMBUS_WRITE) || (size == SIS5595_QUICK)))
338 return 0;
339
340
341 switch (size) {
Jean Delvare1842cc22008-04-29 23:11:38 +0200342 case SIS5595_BYTE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 case SIS5595_BYTE_DATA:
344 data->byte = sis5595_read(SMB_BYTE);
345 break;
346 case SIS5595_WORD_DATA:
347 case SIS5595_PROC_CALL:
348 data->word = sis5595_read(SMB_BYTE) + (sis5595_read(SMB_BYTE + 1) << 8);
349 break;
350 }
351 return 0;
352}
353
354static u32 sis5595_func(struct i2c_adapter *adapter)
355{
356 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
357 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
358 I2C_FUNC_SMBUS_PROC_CALL;
359}
360
Jean Delvare8f9082c2006-09-03 22:39:46 +0200361static const struct i2c_algorithm smbus_algorithm = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 .smbus_xfer = sis5595_access,
363 .functionality = sis5595_func,
364};
365
366static struct i2c_adapter sis5595_adapter = {
367 .owner = THIS_MODULE,
Jean Delvare3401b2f2008-07-14 22:38:29 +0200368 .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 .algo = &smbus_algorithm,
370};
371
372static struct pci_device_id sis5595_ids[] __devinitdata = {
373 { PCI_DEVICE(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_503) },
374 { 0, }
375};
376
377MODULE_DEVICE_TABLE (pci, sis5595_ids);
378
379static int __devinit sis5595_probe(struct pci_dev *dev, const struct pci_device_id *id)
380{
Jean Delvare7375cd82007-07-12 14:12:30 +0200381 int err;
382
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 if (sis5595_setup(dev)) {
384 dev_err(&dev->dev, "SIS5595 not detected, module not inserted.\n");
385 return -ENODEV;
386 }
387
Robert P. J. Day405ae7d2007-02-17 19:13:42 +0100388 /* set up the sysfs linkage to our parent device */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 sis5595_adapter.dev.parent = &dev->dev;
390
Jean Delvare66c7acf2009-01-07 14:29:18 +0100391 snprintf(sis5595_adapter.name, sizeof(sis5595_adapter.name),
392 "SMBus SIS5595 adapter at %04x", sis5595_base + SMB_INDEX);
Jean Delvare7375cd82007-07-12 14:12:30 +0200393 err = i2c_add_adapter(&sis5595_adapter);
394 if (err) {
395 release_region(sis5595_base + SMB_INDEX, 2);
396 return err;
397 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
Jean Delvare7375cd82007-07-12 14:12:30 +0200399 /* Always return failure here. This is to allow other drivers to bind
400 * to this pci device. We don't really want to have control over the
401 * pci device, we only wanted to read as few register values from it.
402 */
403 sis5595_pdev = pci_dev_get(dev);
404 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405}
406
407static struct pci_driver sis5595_driver = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 .name = "sis5595_smbus",
409 .id_table = sis5595_ids,
410 .probe = sis5595_probe,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411};
412
413static int __init i2c_sis5595_init(void)
414{
415 return pci_register_driver(&sis5595_driver);
416}
417
418static void __exit i2c_sis5595_exit(void)
419{
420 pci_unregister_driver(&sis5595_driver);
Jean Delvare7375cd82007-07-12 14:12:30 +0200421 if (sis5595_pdev) {
422 i2c_del_adapter(&sis5595_adapter);
423 release_region(sis5595_base + SMB_INDEX, 2);
424 pci_dev_put(sis5595_pdev);
425 sis5595_pdev = NULL;
426 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427}
428
429MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
430MODULE_DESCRIPTION("SIS5595 SMBus driver");
431MODULE_LICENSE("GPL");
432
433module_init(i2c_sis5595_init);
434module_exit(i2c_sis5595_exit);