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1da177e4 LT |
1 | /* |
2 | i2c-sis630.c - Part of lm_sensors, Linux kernel modules for hardware | |
3 | monitoring | |
4 | ||
5 | Copyright (c) 2002,2003 Alexander Malysh <amalysh@web.de> | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | */ | |
21 | ||
22 | /* | |
23 | Changes: | |
24 | 24.08.2002 | |
25 | Fixed the typo in sis630_access (Thanks to Mark M. Hoffman) | |
26 | Changed sis630_transaction.(Thanks to Mark M. Hoffman) | |
27 | 18.09.2002 | |
28 | Added SIS730 as supported. | |
29 | 21.09.2002 | |
30 | Added high_clock module option.If this option is set | |
31 | used Host Master Clock 56KHz (default 14KHz).For now we save old Host | |
32 | Master Clock and after transaction completed restore (otherwise | |
33 | it's confuse BIOS and hung Machine). | |
34 | 24.09.2002 | |
35 | Fixed typo in sis630_access | |
36 | Fixed logical error by restoring of Host Master Clock | |
37 | 31.07.2003 | |
38 | Added block data read/write support. | |
39 | */ | |
40 | ||
41 | /* | |
42 | Status: beta | |
43 | ||
44 | Supports: | |
45 | SIS 630 | |
46 | SIS 730 | |
47 | ||
48 | Note: we assume there can only be one device, with one SMBus interface. | |
49 | */ | |
50 | ||
1da177e4 LT |
51 | #include <linux/kernel.h> |
52 | #include <linux/module.h> | |
53 | #include <linux/delay.h> | |
54 | #include <linux/pci.h> | |
55 | #include <linux/ioport.h> | |
56 | #include <linux/init.h> | |
57 | #include <linux/i2c.h> | |
58 | #include <asm/io.h> | |
59 | ||
60 | /* SIS630 SMBus registers */ | |
61 | #define SMB_STS 0x80 /* status */ | |
62 | #define SMB_EN 0x81 /* status enable */ | |
63 | #define SMB_CNT 0x82 | |
64 | #define SMBHOST_CNT 0x83 | |
65 | #define SMB_ADDR 0x84 | |
66 | #define SMB_CMD 0x85 | |
67 | #define SMB_PCOUNT 0x86 /* processed count */ | |
68 | #define SMB_COUNT 0x87 | |
69 | #define SMB_BYTE 0x88 /* ~0x8F data byte field */ | |
70 | #define SMBDEV_ADDR 0x90 | |
71 | #define SMB_DB0 0x91 | |
72 | #define SMB_DB1 0x92 | |
73 | #define SMB_SAA 0x93 | |
74 | ||
75 | /* register count for request_region */ | |
76 | #define SIS630_SMB_IOREGION 20 | |
77 | ||
78 | /* PCI address constants */ | |
79 | /* acpi base address register */ | |
80 | #define SIS630_ACPI_BASE_REG 0x74 | |
81 | /* bios control register */ | |
82 | #define SIS630_BIOS_CTL_REG 0x40 | |
83 | ||
84 | /* Other settings */ | |
85 | #define MAX_TIMEOUT 500 | |
86 | ||
87 | /* SIS630 constants */ | |
88 | #define SIS630_QUICK 0x00 | |
89 | #define SIS630_BYTE 0x01 | |
90 | #define SIS630_BYTE_DATA 0x02 | |
91 | #define SIS630_WORD_DATA 0x03 | |
92 | #define SIS630_PCALL 0x04 | |
93 | #define SIS630_BLOCK_DATA 0x05 | |
94 | ||
d6072f84 JD |
95 | static struct pci_driver sis630_driver; |
96 | ||
1da177e4 LT |
97 | /* insmod parameters */ |
98 | static int high_clock; | |
99 | static int force; | |
100 | module_param(high_clock, bool, 0); | |
101 | MODULE_PARM_DESC(high_clock, "Set Host Master Clock to 56KHz (default 14KHz)."); | |
102 | module_param(force, bool, 0); | |
103 | MODULE_PARM_DESC(force, "Forcibly enable the SIS630. DANGEROUS!"); | |
104 | ||
105 | /* acpi base address */ | |
60507095 | 106 | static unsigned short acpi_base; |
1da177e4 LT |
107 | |
108 | /* supported chips */ | |
109 | static int supported[] = { | |
110 | PCI_DEVICE_ID_SI_630, | |
111 | PCI_DEVICE_ID_SI_730, | |
112 | 0 /* terminates the list */ | |
113 | }; | |
114 | ||
115 | static inline u8 sis630_read(u8 reg) | |
116 | { | |
117 | return inb(acpi_base + reg); | |
118 | } | |
119 | ||
120 | static inline void sis630_write(u8 reg, u8 data) | |
121 | { | |
122 | outb(data, acpi_base + reg); | |
123 | } | |
124 | ||
125 | static int sis630_transaction_start(struct i2c_adapter *adap, int size, u8 *oldclock) | |
126 | { | |
127 | int temp; | |
128 | ||
129 | /* Make sure the SMBus host is ready to start transmitting. */ | |
130 | if ((temp = sis630_read(SMB_CNT) & 0x03) != 0x00) { | |
131 | dev_dbg(&adap->dev, "SMBus busy (%02x).Resetting...\n",temp); | |
132 | /* kill smbus transaction */ | |
133 | sis630_write(SMBHOST_CNT, 0x20); | |
134 | ||
135 | if ((temp = sis630_read(SMB_CNT) & 0x03) != 0x00) { | |
136 | dev_dbg(&adap->dev, "Failed! (%02x)\n", temp); | |
97140342 | 137 | return -EBUSY; |
1da177e4 | 138 | } else { |
c5d21b7f | 139 | dev_dbg(&adap->dev, "Successful!\n"); |
1da177e4 LT |
140 | } |
141 | } | |
142 | ||
143 | /* save old clock, so we can prevent machine for hung */ | |
144 | *oldclock = sis630_read(SMB_CNT); | |
145 | ||
146 | dev_dbg(&adap->dev, "saved clock 0x%02x\n", *oldclock); | |
147 | ||
148 | /* disable timeout interrupt , set Host Master Clock to 56KHz if requested */ | |
149 | if (high_clock) | |
150 | sis630_write(SMB_CNT, 0x20); | |
151 | else | |
152 | sis630_write(SMB_CNT, (*oldclock & ~0x40)); | |
153 | ||
154 | /* clear all sticky bits */ | |
155 | temp = sis630_read(SMB_STS); | |
156 | sis630_write(SMB_STS, temp & 0x1e); | |
157 | ||
158 | /* start the transaction by setting bit 4 and size */ | |
159 | sis630_write(SMBHOST_CNT,0x10 | (size & 0x07)); | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | static int sis630_transaction_wait(struct i2c_adapter *adap, int size) | |
165 | { | |
166 | int temp, result = 0, timeout = 0; | |
167 | ||
168 | /* We will always wait for a fraction of a second! */ | |
169 | do { | |
170 | msleep(1); | |
171 | temp = sis630_read(SMB_STS); | |
172 | /* check if block transmitted */ | |
173 | if (size == SIS630_BLOCK_DATA && (temp & 0x10)) | |
174 | break; | |
175 | } while (!(temp & 0x0e) && (timeout++ < MAX_TIMEOUT)); | |
176 | ||
177 | /* If the SMBus is still busy, we give up */ | |
178 | if (timeout >= MAX_TIMEOUT) { | |
179 | dev_dbg(&adap->dev, "SMBus Timeout!\n"); | |
97140342 | 180 | result = -ETIMEDOUT; |
1da177e4 LT |
181 | } |
182 | ||
183 | if (temp & 0x02) { | |
184 | dev_dbg(&adap->dev, "Error: Failed bus transaction\n"); | |
97140342 | 185 | result = -ENXIO; |
1da177e4 LT |
186 | } |
187 | ||
188 | if (temp & 0x04) { | |
189 | dev_err(&adap->dev, "Bus collision!\n"); | |
97140342 | 190 | result = -EIO; |
1da177e4 LT |
191 | /* |
192 | TBD: Datasheet say: | |
193 | the software should clear this bit and restart SMBUS operation. | |
194 | Should we do it or user start request again? | |
195 | */ | |
196 | } | |
197 | ||
198 | return result; | |
199 | } | |
200 | ||
201 | static void sis630_transaction_end(struct i2c_adapter *adap, u8 oldclock) | |
202 | { | |
203 | int temp = 0; | |
204 | ||
205 | /* clear all status "sticky" bits */ | |
206 | sis630_write(SMB_STS, temp); | |
207 | ||
208 | dev_dbg(&adap->dev, "SMB_CNT before clock restore 0x%02x\n", sis630_read(SMB_CNT)); | |
209 | ||
210 | /* | |
211 | * restore old Host Master Clock if high_clock is set | |
212 | * and oldclock was not 56KHz | |
213 | */ | |
214 | if (high_clock && !(oldclock & 0x20)) | |
215 | sis630_write(SMB_CNT,(sis630_read(SMB_CNT) & ~0x20)); | |
216 | ||
217 | dev_dbg(&adap->dev, "SMB_CNT after clock restore 0x%02x\n", sis630_read(SMB_CNT)); | |
218 | } | |
219 | ||
220 | static int sis630_transaction(struct i2c_adapter *adap, int size) | |
221 | { | |
222 | int result = 0; | |
223 | u8 oldclock = 0; | |
224 | ||
225 | result = sis630_transaction_start(adap, size, &oldclock); | |
226 | if (!result) { | |
227 | result = sis630_transaction_wait(adap, size); | |
228 | sis630_transaction_end(adap, oldclock); | |
229 | } | |
230 | ||
231 | return result; | |
232 | } | |
233 | ||
234 | static int sis630_block_data(struct i2c_adapter *adap, union i2c_smbus_data *data, int read_write) | |
235 | { | |
236 | int i, len = 0, rc = 0; | |
237 | u8 oldclock = 0; | |
238 | ||
239 | if (read_write == I2C_SMBUS_WRITE) { | |
240 | len = data->block[0]; | |
241 | if (len < 0) | |
242 | len = 0; | |
243 | else if (len > 32) | |
244 | len = 32; | |
245 | sis630_write(SMB_COUNT, len); | |
246 | for (i=1; i <= len; i++) { | |
247 | dev_dbg(&adap->dev, "set data 0x%02x\n", data->block[i]); | |
248 | /* set data */ | |
249 | sis630_write(SMB_BYTE+(i-1)%8, data->block[i]); | |
250 | if (i==8 || (len<8 && i==len)) { | |
251 | dev_dbg(&adap->dev, "start trans len=%d i=%d\n",len ,i); | |
252 | /* first transaction */ | |
97140342 DB |
253 | rc = sis630_transaction_start(adap, |
254 | SIS630_BLOCK_DATA, &oldclock); | |
255 | if (rc) | |
256 | return rc; | |
1da177e4 LT |
257 | } |
258 | else if ((i-1)%8 == 7 || i==len) { | |
259 | dev_dbg(&adap->dev, "trans_wait len=%d i=%d\n",len,i); | |
260 | if (i>8) { | |
261 | dev_dbg(&adap->dev, "clear smbary_sts len=%d i=%d\n",len,i); | |
262 | /* | |
263 | If this is not first transaction, | |
264 | we must clear sticky bit. | |
265 | clear SMBARY_STS | |
266 | */ | |
267 | sis630_write(SMB_STS,0x10); | |
268 | } | |
97140342 DB |
269 | rc = sis630_transaction_wait(adap, |
270 | SIS630_BLOCK_DATA); | |
271 | if (rc) { | |
1da177e4 | 272 | dev_dbg(&adap->dev, "trans_wait failed\n"); |
1da177e4 LT |
273 | break; |
274 | } | |
275 | } | |
276 | } | |
277 | } | |
278 | else { | |
279 | /* read request */ | |
280 | data->block[0] = len = 0; | |
97140342 DB |
281 | rc = sis630_transaction_start(adap, |
282 | SIS630_BLOCK_DATA, &oldclock); | |
283 | if (rc) | |
284 | return rc; | |
1da177e4 | 285 | do { |
97140342 DB |
286 | rc = sis630_transaction_wait(adap, SIS630_BLOCK_DATA); |
287 | if (rc) { | |
1da177e4 | 288 | dev_dbg(&adap->dev, "trans_wait failed\n"); |
1da177e4 LT |
289 | break; |
290 | } | |
291 | /* if this first transaction then read byte count */ | |
292 | if (len == 0) | |
293 | data->block[0] = sis630_read(SMB_COUNT); | |
294 | ||
295 | /* just to be sure */ | |
296 | if (data->block[0] > 32) | |
297 | data->block[0] = 32; | |
298 | ||
299 | dev_dbg(&adap->dev, "block data read len=0x%x\n", data->block[0]); | |
300 | ||
301 | for (i=0; i < 8 && len < data->block[0]; i++,len++) { | |
302 | dev_dbg(&adap->dev, "read i=%d len=%d\n", i, len); | |
303 | data->block[len+1] = sis630_read(SMB_BYTE+i); | |
304 | } | |
305 | ||
306 | dev_dbg(&adap->dev, "clear smbary_sts len=%d i=%d\n",len,i); | |
307 | ||
308 | /* clear SMBARY_STS */ | |
309 | sis630_write(SMB_STS,0x10); | |
310 | } while(len < data->block[0]); | |
311 | } | |
312 | ||
313 | sis630_transaction_end(adap, oldclock); | |
314 | ||
315 | return rc; | |
316 | } | |
317 | ||
97140342 | 318 | /* Return negative errno on error. */ |
1da177e4 LT |
319 | static s32 sis630_access(struct i2c_adapter *adap, u16 addr, |
320 | unsigned short flags, char read_write, | |
321 | u8 command, int size, union i2c_smbus_data *data) | |
322 | { | |
97140342 DB |
323 | int status; |
324 | ||
1da177e4 LT |
325 | switch (size) { |
326 | case I2C_SMBUS_QUICK: | |
327 | sis630_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01)); | |
328 | size = SIS630_QUICK; | |
329 | break; | |
330 | case I2C_SMBUS_BYTE: | |
331 | sis630_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01)); | |
332 | if (read_write == I2C_SMBUS_WRITE) | |
333 | sis630_write(SMB_CMD, command); | |
334 | size = SIS630_BYTE; | |
335 | break; | |
336 | case I2C_SMBUS_BYTE_DATA: | |
337 | sis630_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01)); | |
338 | sis630_write(SMB_CMD, command); | |
339 | if (read_write == I2C_SMBUS_WRITE) | |
340 | sis630_write(SMB_BYTE, data->byte); | |
341 | size = SIS630_BYTE_DATA; | |
342 | break; | |
343 | case I2C_SMBUS_PROC_CALL: | |
344 | case I2C_SMBUS_WORD_DATA: | |
345 | sis630_write(SMB_ADDR,((addr & 0x7f) << 1) | (read_write & 0x01)); | |
346 | sis630_write(SMB_CMD, command); | |
347 | if (read_write == I2C_SMBUS_WRITE) { | |
348 | sis630_write(SMB_BYTE, data->word & 0xff); | |
349 | sis630_write(SMB_BYTE + 1,(data->word & 0xff00) >> 8); | |
350 | } | |
351 | size = (size == I2C_SMBUS_PROC_CALL ? SIS630_PCALL : SIS630_WORD_DATA); | |
352 | break; | |
353 | case I2C_SMBUS_BLOCK_DATA: | |
354 | sis630_write(SMB_ADDR,((addr & 0x7f) << 1) | (read_write & 0x01)); | |
355 | sis630_write(SMB_CMD, command); | |
356 | size = SIS630_BLOCK_DATA; | |
357 | return sis630_block_data(adap, data, read_write); | |
358 | default: | |
ac7fc4fb JD |
359 | dev_warn(&adap->dev, "Unsupported transaction %d\n", |
360 | size); | |
97140342 | 361 | return -EOPNOTSUPP; |
1da177e4 LT |
362 | } |
363 | ||
97140342 DB |
364 | status = sis630_transaction(adap, size); |
365 | if (status) | |
366 | return status; | |
1da177e4 LT |
367 | |
368 | if ((size != SIS630_PCALL) && | |
369 | ((read_write == I2C_SMBUS_WRITE) || (size == SIS630_QUICK))) { | |
370 | return 0; | |
371 | } | |
372 | ||
373 | switch(size) { | |
374 | case SIS630_BYTE: | |
375 | case SIS630_BYTE_DATA: | |
376 | data->byte = sis630_read(SMB_BYTE); | |
377 | break; | |
378 | case SIS630_PCALL: | |
379 | case SIS630_WORD_DATA: | |
380 | data->word = sis630_read(SMB_BYTE) + (sis630_read(SMB_BYTE + 1) << 8); | |
381 | break; | |
1da177e4 LT |
382 | } |
383 | ||
384 | return 0; | |
385 | } | |
386 | ||
387 | static u32 sis630_func(struct i2c_adapter *adapter) | |
388 | { | |
389 | return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_BYTE_DATA | | |
390 | I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_PROC_CALL | | |
391 | I2C_FUNC_SMBUS_BLOCK_DATA; | |
392 | } | |
393 | ||
394 | static int sis630_setup(struct pci_dev *sis630_dev) | |
395 | { | |
396 | unsigned char b; | |
397 | struct pci_dev *dummy = NULL; | |
398 | int retval = -ENODEV, i; | |
399 | ||
400 | /* check for supported SiS devices */ | |
401 | for (i=0; supported[i] > 0 ; i++) { | |
402 | if ((dummy = pci_get_device(PCI_VENDOR_ID_SI, supported[i], dummy))) | |
403 | break; /* found */ | |
404 | } | |
405 | ||
406 | if (dummy) { | |
407 | pci_dev_put(dummy); | |
408 | } | |
409 | else if (force) { | |
410 | dev_err(&sis630_dev->dev, "WARNING: Can't detect SIS630 compatible device, but " | |
411 | "loading because of force option enabled\n"); | |
412 | } | |
413 | else { | |
414 | return -ENODEV; | |
415 | } | |
416 | ||
417 | /* | |
418 | Enable ACPI first , so we can accsess reg 74-75 | |
419 | in acpi io space and read acpi base addr | |
420 | */ | |
421 | if (pci_read_config_byte(sis630_dev, SIS630_BIOS_CTL_REG,&b)) { | |
422 | dev_err(&sis630_dev->dev, "Error: Can't read bios ctl reg\n"); | |
423 | goto exit; | |
424 | } | |
425 | /* if ACPI already enabled , do nothing */ | |
426 | if (!(b & 0x80) && | |
427 | pci_write_config_byte(sis630_dev, SIS630_BIOS_CTL_REG, b | 0x80)) { | |
428 | dev_err(&sis630_dev->dev, "Error: Can't enable ACPI\n"); | |
429 | goto exit; | |
430 | } | |
431 | ||
432 | /* Determine the ACPI base address */ | |
433 | if (pci_read_config_word(sis630_dev,SIS630_ACPI_BASE_REG,&acpi_base)) { | |
434 | dev_err(&sis630_dev->dev, "Error: Can't determine ACPI base address\n"); | |
435 | goto exit; | |
436 | } | |
437 | ||
438 | dev_dbg(&sis630_dev->dev, "ACPI base at 0x%04x\n", acpi_base); | |
439 | ||
440 | /* Everything is happy, let's grab the memory and set things up. */ | |
d6072f84 JD |
441 | if (!request_region(acpi_base + SMB_STS, SIS630_SMB_IOREGION, |
442 | sis630_driver.name)) { | |
1da177e4 LT |
443 | dev_err(&sis630_dev->dev, "SMBus registers 0x%04x-0x%04x already " |
444 | "in use!\n", acpi_base + SMB_STS, acpi_base + SMB_SAA); | |
445 | goto exit; | |
446 | } | |
447 | ||
448 | retval = 0; | |
449 | ||
450 | exit: | |
451 | if (retval) | |
452 | acpi_base = 0; | |
453 | return retval; | |
454 | } | |
455 | ||
456 | ||
8f9082c5 | 457 | static const struct i2c_algorithm smbus_algorithm = { |
1da177e4 LT |
458 | .smbus_xfer = sis630_access, |
459 | .functionality = sis630_func, | |
460 | }; | |
461 | ||
462 | static struct i2c_adapter sis630_adapter = { | |
463 | .owner = THIS_MODULE, | |
9ace555d | 464 | .id = I2C_HW_SMBUS_SIS630, |
3401b2ff | 465 | .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, |
1da177e4 LT |
466 | .algo = &smbus_algorithm, |
467 | }; | |
468 | ||
469 | static struct pci_device_id sis630_ids[] __devinitdata = { | |
470 | { PCI_DEVICE(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_503) }, | |
471 | { PCI_DEVICE(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_LPC) }, | |
472 | { 0, } | |
473 | }; | |
474 | ||
475 | MODULE_DEVICE_TABLE (pci, sis630_ids); | |
476 | ||
477 | static int __devinit sis630_probe(struct pci_dev *dev, const struct pci_device_id *id) | |
478 | { | |
479 | if (sis630_setup(dev)) { | |
480 | dev_err(&dev->dev, "SIS630 comp. bus not detected, module not inserted.\n"); | |
481 | return -ENODEV; | |
482 | } | |
483 | ||
405ae7d3 | 484 | /* set up the sysfs linkage to our parent device */ |
1da177e4 LT |
485 | sis630_adapter.dev.parent = &dev->dev; |
486 | ||
487 | sprintf(sis630_adapter.name, "SMBus SIS630 adapter at %04x", | |
488 | acpi_base + SMB_STS); | |
489 | ||
490 | return i2c_add_adapter(&sis630_adapter); | |
491 | } | |
492 | ||
493 | static void __devexit sis630_remove(struct pci_dev *dev) | |
494 | { | |
495 | if (acpi_base) { | |
496 | i2c_del_adapter(&sis630_adapter); | |
497 | release_region(acpi_base + SMB_STS, SIS630_SMB_IOREGION); | |
498 | acpi_base = 0; | |
499 | } | |
500 | } | |
501 | ||
502 | ||
503 | static struct pci_driver sis630_driver = { | |
504 | .name = "sis630_smbus", | |
505 | .id_table = sis630_ids, | |
506 | .probe = sis630_probe, | |
507 | .remove = __devexit_p(sis630_remove), | |
508 | }; | |
509 | ||
510 | static int __init i2c_sis630_init(void) | |
511 | { | |
512 | return pci_register_driver(&sis630_driver); | |
513 | } | |
514 | ||
515 | ||
516 | static void __exit i2c_sis630_exit(void) | |
517 | { | |
518 | pci_unregister_driver(&sis630_driver); | |
519 | } | |
520 | ||
521 | ||
522 | MODULE_LICENSE("GPL"); | |
523 | MODULE_AUTHOR("Alexander Malysh <amalysh@web.de>"); | |
524 | MODULE_DESCRIPTION("SIS630 SMBus driver"); | |
525 | ||
526 | module_init(i2c_sis630_init); | |
527 | module_exit(i2c_sis630_exit); |