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Commit | Line | Data |
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1da177e4 | 1 | /* |
455f3323 | 2 | i2c-i801.c - Part of lm_sensors, Linux kernel modules for hardware |
1da177e4 LT |
3 | monitoring |
4 | Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl>, | |
5 | Philip Edelbrock <phil@netroedge.com>, and Mark D. Studebaker | |
6 | <mdsxyz123@yahoo.com> | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | */ | |
22 | ||
23 | /* | |
24 | SUPPORTED DEVICES PCI ID | |
25 | 82801AA 2413 | |
26 | 82801AB 2423 | |
27 | 82801BA 2443 | |
28 | 82801CA/CAM 2483 | |
29 | 82801DB 24C3 (HW PEC supported, 32 byte buffer not supported) | |
30 | 82801EB 24D3 (HW PEC supported, 32 byte buffer not supported) | |
31 | 6300ESB 25A4 | |
32 | ICH6 266A | |
33 | ICH7 27DA | |
b0a70b57 | 34 | ESB2 269B |
8254fc4a | 35 | ICH8 283E |
1da177e4 LT |
36 | This driver supports several versions of Intel's I/O Controller Hubs (ICH). |
37 | For SMBus support, they are similar to the PIIX4 and are part | |
38 | of Intel's '810' and other chipsets. | |
455f3323 | 39 | See the file Documentation/i2c/busses/i2c-i801 for details. |
1da177e4 LT |
40 | I2C Block Read and Process Call are not supported. |
41 | */ | |
42 | ||
43 | /* Note: we assume there can only be one I801, with one SMBus interface */ | |
44 | ||
1da177e4 LT |
45 | #include <linux/module.h> |
46 | #include <linux/pci.h> | |
47 | #include <linux/kernel.h> | |
48 | #include <linux/stddef.h> | |
49 | #include <linux/delay.h> | |
50 | #include <linux/sched.h> | |
51 | #include <linux/ioport.h> | |
52 | #include <linux/init.h> | |
53 | #include <linux/i2c.h> | |
54 | #include <asm/io.h> | |
55 | ||
1da177e4 LT |
56 | /* I801 SMBus address offsets */ |
57 | #define SMBHSTSTS (0 + i801_smba) | |
58 | #define SMBHSTCNT (2 + i801_smba) | |
59 | #define SMBHSTCMD (3 + i801_smba) | |
60 | #define SMBHSTADD (4 + i801_smba) | |
61 | #define SMBHSTDAT0 (5 + i801_smba) | |
62 | #define SMBHSTDAT1 (6 + i801_smba) | |
63 | #define SMBBLKDAT (7 + i801_smba) | |
64 | #define SMBPEC (8 + i801_smba) /* ICH4 only */ | |
65 | #define SMBAUXSTS (12 + i801_smba) /* ICH4 only */ | |
66 | #define SMBAUXCTL (13 + i801_smba) /* ICH4 only */ | |
67 | ||
68 | /* PCI Address Constants */ | |
6dcc19df | 69 | #define SMBBAR 4 |
1da177e4 | 70 | #define SMBHSTCFG 0x040 |
1da177e4 LT |
71 | |
72 | /* Host configuration bits for SMBHSTCFG */ | |
73 | #define SMBHSTCFG_HST_EN 1 | |
74 | #define SMBHSTCFG_SMB_SMI_EN 2 | |
75 | #define SMBHSTCFG_I2C_EN 4 | |
76 | ||
77 | /* Other settings */ | |
78 | #define MAX_TIMEOUT 100 | |
79 | #define ENABLE_INT9 0 /* set to 0x01 to enable - untested */ | |
80 | ||
81 | /* I801 command constants */ | |
82 | #define I801_QUICK 0x00 | |
83 | #define I801_BYTE 0x04 | |
84 | #define I801_BYTE_DATA 0x08 | |
85 | #define I801_WORD_DATA 0x0C | |
86 | #define I801_PROC_CALL 0x10 /* later chips only, unimplemented */ | |
87 | #define I801_BLOCK_DATA 0x14 | |
88 | #define I801_I2C_BLOCK_DATA 0x18 /* unimplemented */ | |
89 | #define I801_BLOCK_LAST 0x34 | |
90 | #define I801_I2C_BLOCK_LAST 0x38 /* unimplemented */ | |
91 | #define I801_START 0x40 | |
92 | #define I801_PEC_EN 0x80 /* ICH4 only */ | |
93 | ||
1da177e4 LT |
94 | |
95 | static int i801_transaction(void); | |
585b3160 JD |
96 | static int i801_block_transaction(union i2c_smbus_data *data, char read_write, |
97 | int command, int hwpec); | |
1da177e4 | 98 | |
6dcc19df | 99 | static unsigned long i801_smba; |
d6072f84 | 100 | static struct pci_driver i801_driver; |
1da177e4 LT |
101 | static struct pci_dev *I801_dev; |
102 | static int isich4; | |
103 | ||
1da177e4 LT |
104 | static int i801_transaction(void) |
105 | { | |
106 | int temp; | |
107 | int result = 0; | |
108 | int timeout = 0; | |
109 | ||
368609c5 | 110 | dev_dbg(&I801_dev->dev, "Transaction (pre): CNT=%02x, CMD=%02x, " |
1da177e4 LT |
111 | "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT), |
112 | inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), | |
113 | inb_p(SMBHSTDAT1)); | |
114 | ||
115 | /* Make sure the SMBus host is ready to start transmitting */ | |
116 | /* 0x1f = Failed, Bus_Err, Dev_Err, Intr, Host_Busy */ | |
117 | if ((temp = (0x1f & inb_p(SMBHSTSTS))) != 0x00) { | |
541e6a02 | 118 | dev_dbg(&I801_dev->dev, "SMBus busy (%02x). Resetting...\n", |
1da177e4 LT |
119 | temp); |
120 | outb_p(temp, SMBHSTSTS); | |
121 | if ((temp = (0x1f & inb_p(SMBHSTSTS))) != 0x00) { | |
122 | dev_dbg(&I801_dev->dev, "Failed! (%02x)\n", temp); | |
123 | return -1; | |
124 | } else { | |
125 | dev_dbg(&I801_dev->dev, "Successfull!\n"); | |
126 | } | |
127 | } | |
128 | ||
129 | outb_p(inb(SMBHSTCNT) | I801_START, SMBHSTCNT); | |
130 | ||
131 | /* We will always wait for a fraction of a second! */ | |
132 | do { | |
133 | msleep(1); | |
134 | temp = inb_p(SMBHSTSTS); | |
135 | } while ((temp & 0x01) && (timeout++ < MAX_TIMEOUT)); | |
136 | ||
137 | /* If the SMBus is still busy, we give up */ | |
138 | if (timeout >= MAX_TIMEOUT) { | |
139 | dev_dbg(&I801_dev->dev, "SMBus Timeout!\n"); | |
140 | result = -1; | |
141 | } | |
142 | ||
143 | if (temp & 0x10) { | |
144 | result = -1; | |
145 | dev_dbg(&I801_dev->dev, "Error: Failed bus transaction\n"); | |
146 | } | |
147 | ||
148 | if (temp & 0x08) { | |
149 | result = -1; | |
150 | dev_err(&I801_dev->dev, "Bus collision! SMBus may be locked " | |
151 | "until next hard reset. (sorry!)\n"); | |
152 | /* Clock stops and slave is stuck in mid-transmission */ | |
153 | } | |
154 | ||
155 | if (temp & 0x04) { | |
156 | result = -1; | |
157 | dev_dbg(&I801_dev->dev, "Error: no response!\n"); | |
158 | } | |
159 | ||
160 | if ((inb_p(SMBHSTSTS) & 0x1f) != 0x00) | |
161 | outb_p(inb(SMBHSTSTS), SMBHSTSTS); | |
162 | ||
163 | if ((temp = (0x1f & inb_p(SMBHSTSTS))) != 0x00) { | |
368609c5 | 164 | dev_dbg(&I801_dev->dev, "Failed reset at end of transaction " |
1da177e4 LT |
165 | "(%02x)\n", temp); |
166 | } | |
167 | dev_dbg(&I801_dev->dev, "Transaction (post): CNT=%02x, CMD=%02x, " | |
168 | "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT), | |
169 | inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), | |
170 | inb_p(SMBHSTDAT1)); | |
171 | return result; | |
172 | } | |
173 | ||
174 | /* All-inclusive block transaction function */ | |
175 | static int i801_block_transaction(union i2c_smbus_data *data, char read_write, | |
585b3160 | 176 | int command, int hwpec) |
1da177e4 LT |
177 | { |
178 | int i, len; | |
179 | int smbcmd; | |
180 | int temp; | |
181 | int result = 0; | |
182 | int timeout; | |
183 | unsigned char hostc, errmask; | |
184 | ||
185 | if (command == I2C_SMBUS_I2C_BLOCK_DATA) { | |
186 | if (read_write == I2C_SMBUS_WRITE) { | |
187 | /* set I2C_EN bit in configuration register */ | |
188 | pci_read_config_byte(I801_dev, SMBHSTCFG, &hostc); | |
189 | pci_write_config_byte(I801_dev, SMBHSTCFG, | |
190 | hostc | SMBHSTCFG_I2C_EN); | |
191 | } else { | |
192 | dev_err(&I801_dev->dev, | |
193 | "I2C_SMBUS_I2C_BLOCK_READ not DB!\n"); | |
194 | return -1; | |
195 | } | |
196 | } | |
197 | ||
198 | if (read_write == I2C_SMBUS_WRITE) { | |
199 | len = data->block[0]; | |
200 | if (len < 1) | |
201 | len = 1; | |
202 | if (len > 32) | |
203 | len = 32; | |
204 | outb_p(len, SMBHSTDAT0); | |
205 | outb_p(data->block[1], SMBBLKDAT); | |
206 | } else { | |
207 | len = 32; /* max for reads */ | |
208 | } | |
209 | ||
210 | if(isich4 && command != I2C_SMBUS_I2C_BLOCK_DATA) { | |
211 | /* set 32 byte buffer */ | |
212 | } | |
213 | ||
214 | for (i = 1; i <= len; i++) { | |
215 | if (i == len && read_write == I2C_SMBUS_READ) | |
216 | smbcmd = I801_BLOCK_LAST; | |
217 | else | |
218 | smbcmd = I801_BLOCK_DATA; | |
219 | outb_p(smbcmd | ENABLE_INT9, SMBHSTCNT); | |
220 | ||
221 | dev_dbg(&I801_dev->dev, "Block (pre %d): CNT=%02x, CMD=%02x, " | |
222 | "ADD=%02x, DAT0=%02x, BLKDAT=%02x\n", i, | |
223 | inb_p(SMBHSTCNT), inb_p(SMBHSTCMD), inb_p(SMBHSTADD), | |
224 | inb_p(SMBHSTDAT0), inb_p(SMBBLKDAT)); | |
225 | ||
226 | /* Make sure the SMBus host is ready to start transmitting */ | |
227 | temp = inb_p(SMBHSTSTS); | |
228 | if (i == 1) { | |
229 | /* Erronenous conditions before transaction: | |
230 | * Byte_Done, Failed, Bus_Err, Dev_Err, Intr, Host_Busy */ | |
231 | errmask=0x9f; | |
232 | } else { | |
233 | /* Erronenous conditions during transaction: | |
234 | * Failed, Bus_Err, Dev_Err, Intr */ | |
235 | errmask=0x1e; | |
236 | } | |
237 | if (temp & errmask) { | |
238 | dev_dbg(&I801_dev->dev, "SMBus busy (%02x). " | |
541e6a02 | 239 | "Resetting...\n", temp); |
1da177e4 LT |
240 | outb_p(temp, SMBHSTSTS); |
241 | if (((temp = inb_p(SMBHSTSTS)) & errmask) != 0x00) { | |
242 | dev_err(&I801_dev->dev, | |
243 | "Reset failed! (%02x)\n", temp); | |
244 | result = -1; | |
245 | goto END; | |
246 | } | |
247 | if (i != 1) { | |
248 | /* if die in middle of block transaction, fail */ | |
249 | result = -1; | |
250 | goto END; | |
251 | } | |
252 | } | |
253 | ||
254 | if (i == 1) | |
255 | outb_p(inb(SMBHSTCNT) | I801_START, SMBHSTCNT); | |
256 | ||
257 | /* We will always wait for a fraction of a second! */ | |
258 | timeout = 0; | |
259 | do { | |
1da177e4 | 260 | msleep(1); |
397e2f66 | 261 | temp = inb_p(SMBHSTSTS); |
1da177e4 LT |
262 | } |
263 | while ((!(temp & 0x80)) | |
264 | && (timeout++ < MAX_TIMEOUT)); | |
265 | ||
266 | /* If the SMBus is still busy, we give up */ | |
267 | if (timeout >= MAX_TIMEOUT) { | |
268 | result = -1; | |
269 | dev_dbg(&I801_dev->dev, "SMBus Timeout!\n"); | |
270 | } | |
271 | ||
272 | if (temp & 0x10) { | |
273 | result = -1; | |
274 | dev_dbg(&I801_dev->dev, | |
275 | "Error: Failed bus transaction\n"); | |
276 | } else if (temp & 0x08) { | |
277 | result = -1; | |
278 | dev_err(&I801_dev->dev, "Bus collision!\n"); | |
279 | } else if (temp & 0x04) { | |
280 | result = -1; | |
281 | dev_dbg(&I801_dev->dev, "Error: no response!\n"); | |
282 | } | |
283 | ||
284 | if (i == 1 && read_write == I2C_SMBUS_READ) { | |
285 | len = inb_p(SMBHSTDAT0); | |
286 | if (len < 1) | |
287 | len = 1; | |
288 | if (len > 32) | |
289 | len = 32; | |
290 | data->block[0] = len; | |
291 | } | |
292 | ||
293 | /* Retrieve/store value in SMBBLKDAT */ | |
294 | if (read_write == I2C_SMBUS_READ) | |
295 | data->block[i] = inb_p(SMBBLKDAT); | |
296 | if (read_write == I2C_SMBUS_WRITE && i+1 <= len) | |
297 | outb_p(data->block[i+1], SMBBLKDAT); | |
298 | if ((temp & 0x9e) != 0x00) | |
299 | outb_p(temp, SMBHSTSTS); /* signals SMBBLKDAT ready */ | |
300 | ||
301 | if ((temp = (0x1e & inb_p(SMBHSTSTS))) != 0x00) { | |
302 | dev_dbg(&I801_dev->dev, | |
303 | "Bad status (%02x) at end of transaction\n", | |
304 | temp); | |
305 | } | |
306 | dev_dbg(&I801_dev->dev, "Block (post %d): CNT=%02x, CMD=%02x, " | |
307 | "ADD=%02x, DAT0=%02x, BLKDAT=%02x\n", i, | |
308 | inb_p(SMBHSTCNT), inb_p(SMBHSTCMD), inb_p(SMBHSTADD), | |
309 | inb_p(SMBHSTDAT0), inb_p(SMBBLKDAT)); | |
310 | ||
311 | if (result < 0) | |
312 | goto END; | |
313 | } | |
314 | ||
e8aac4a9 | 315 | if (hwpec) { |
1da177e4 LT |
316 | /* wait for INTR bit as advised by Intel */ |
317 | timeout = 0; | |
318 | do { | |
1da177e4 | 319 | msleep(1); |
397e2f66 | 320 | temp = inb_p(SMBHSTSTS); |
1da177e4 LT |
321 | } while ((!(temp & 0x02)) |
322 | && (timeout++ < MAX_TIMEOUT)); | |
323 | ||
324 | if (timeout >= MAX_TIMEOUT) { | |
325 | dev_dbg(&I801_dev->dev, "PEC Timeout!\n"); | |
326 | } | |
327 | outb_p(temp, SMBHSTSTS); | |
328 | } | |
1da177e4 LT |
329 | result = 0; |
330 | END: | |
331 | if (command == I2C_SMBUS_I2C_BLOCK_DATA) { | |
332 | /* restore saved configuration register value */ | |
333 | pci_write_config_byte(I801_dev, SMBHSTCFG, hostc); | |
334 | } | |
335 | return result; | |
336 | } | |
337 | ||
338 | /* Return -1 on error. */ | |
339 | static s32 i801_access(struct i2c_adapter * adap, u16 addr, | |
340 | unsigned short flags, char read_write, u8 command, | |
341 | int size, union i2c_smbus_data * data) | |
342 | { | |
e8aac4a9 | 343 | int hwpec; |
1da177e4 LT |
344 | int block = 0; |
345 | int ret, xact = 0; | |
346 | ||
e8aac4a9 JD |
347 | hwpec = isich4 && (flags & I2C_CLIENT_PEC) |
348 | && size != I2C_SMBUS_QUICK | |
349 | && size != I2C_SMBUS_I2C_BLOCK_DATA; | |
1da177e4 LT |
350 | |
351 | switch (size) { | |
352 | case I2C_SMBUS_QUICK: | |
353 | outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), | |
354 | SMBHSTADD); | |
355 | xact = I801_QUICK; | |
356 | break; | |
357 | case I2C_SMBUS_BYTE: | |
358 | outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), | |
359 | SMBHSTADD); | |
360 | if (read_write == I2C_SMBUS_WRITE) | |
361 | outb_p(command, SMBHSTCMD); | |
362 | xact = I801_BYTE; | |
363 | break; | |
364 | case I2C_SMBUS_BYTE_DATA: | |
365 | outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), | |
366 | SMBHSTADD); | |
367 | outb_p(command, SMBHSTCMD); | |
368 | if (read_write == I2C_SMBUS_WRITE) | |
369 | outb_p(data->byte, SMBHSTDAT0); | |
370 | xact = I801_BYTE_DATA; | |
371 | break; | |
372 | case I2C_SMBUS_WORD_DATA: | |
373 | outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), | |
374 | SMBHSTADD); | |
375 | outb_p(command, SMBHSTCMD); | |
376 | if (read_write == I2C_SMBUS_WRITE) { | |
377 | outb_p(data->word & 0xff, SMBHSTDAT0); | |
378 | outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1); | |
379 | } | |
380 | xact = I801_WORD_DATA; | |
381 | break; | |
382 | case I2C_SMBUS_BLOCK_DATA: | |
383 | case I2C_SMBUS_I2C_BLOCK_DATA: | |
1da177e4 LT |
384 | outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
385 | SMBHSTADD); | |
386 | outb_p(command, SMBHSTCMD); | |
387 | block = 1; | |
388 | break; | |
389 | case I2C_SMBUS_PROC_CALL: | |
390 | default: | |
391 | dev_err(&I801_dev->dev, "Unsupported transaction %d\n", size); | |
392 | return -1; | |
393 | } | |
394 | ||
2e3e13f8 | 395 | outb_p(hwpec, SMBAUXCTL); /* enable/disable hardware PEC */ |
e8aac4a9 | 396 | |
1da177e4 | 397 | if(block) |
585b3160 | 398 | ret = i801_block_transaction(data, read_write, size, hwpec); |
1da177e4 LT |
399 | else { |
400 | outb_p(xact | ENABLE_INT9, SMBHSTCNT); | |
401 | ret = i801_transaction(); | |
402 | } | |
403 | ||
c79cfbac JD |
404 | /* Some BIOSes don't like it when PEC is enabled at reboot or resume |
405 | time, so we forcibly disable it after every transaction. */ | |
406 | if (hwpec) | |
407 | outb_p(0, SMBAUXCTL); | |
408 | ||
1da177e4 LT |
409 | if(block) |
410 | return ret; | |
411 | if(ret) | |
412 | return -1; | |
413 | if ((read_write == I2C_SMBUS_WRITE) || (xact == I801_QUICK)) | |
414 | return 0; | |
415 | ||
416 | switch (xact & 0x7f) { | |
417 | case I801_BYTE: /* Result put in SMBHSTDAT0 */ | |
418 | case I801_BYTE_DATA: | |
419 | data->byte = inb_p(SMBHSTDAT0); | |
420 | break; | |
421 | case I801_WORD_DATA: | |
422 | data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8); | |
423 | break; | |
424 | } | |
425 | return 0; | |
426 | } | |
427 | ||
428 | ||
429 | static u32 i801_func(struct i2c_adapter *adapter) | |
430 | { | |
431 | return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | | |
432 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | | |
433 | I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_WRITE_I2C_BLOCK | |
b8095544 | 434 | | (isich4 ? I2C_FUNC_SMBUS_HWPEC_CALC : 0); |
1da177e4 LT |
435 | } |
436 | ||
437 | static struct i2c_algorithm smbus_algorithm = { | |
1da177e4 LT |
438 | .smbus_xfer = i801_access, |
439 | .functionality = i801_func, | |
440 | }; | |
441 | ||
442 | static struct i2c_adapter i801_adapter = { | |
443 | .owner = THIS_MODULE, | |
444 | .class = I2C_CLASS_HWMON, | |
445 | .algo = &smbus_algorithm, | |
1da177e4 LT |
446 | }; |
447 | ||
448 | static struct pci_device_id i801_ids[] = { | |
449 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AA_3) }, | |
450 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AB_3) }, | |
451 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_2) }, | |
452 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_3) }, | |
453 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_3) }, | |
454 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_3) }, | |
455 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_4) }, | |
456 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_16) }, | |
457 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_17) }, | |
b0a70b57 | 458 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB2_17) }, |
8254fc4a | 459 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH8_5) }, |
1da177e4 LT |
460 | { 0, } |
461 | }; | |
462 | ||
463 | MODULE_DEVICE_TABLE (pci, i801_ids); | |
464 | ||
465 | static int __devinit i801_probe(struct pci_dev *dev, const struct pci_device_id *id) | |
466 | { | |
02dd7ae2 | 467 | unsigned char temp; |
455f3323 | 468 | int err; |
1da177e4 | 469 | |
02dd7ae2 JD |
470 | I801_dev = dev; |
471 | if ((dev->device == PCI_DEVICE_ID_INTEL_82801DB_3) || | |
472 | (dev->device == PCI_DEVICE_ID_INTEL_82801EB_3) || | |
473 | (dev->device == PCI_DEVICE_ID_INTEL_ESB_4)) | |
474 | isich4 = 1; | |
475 | else | |
476 | isich4 = 0; | |
477 | ||
478 | err = pci_enable_device(dev); | |
479 | if (err) { | |
480 | dev_err(&dev->dev, "Failed to enable SMBus PCI device (%d)\n", | |
481 | err); | |
482 | goto exit; | |
483 | } | |
484 | ||
485 | /* Determine the address of the SMBus area */ | |
486 | i801_smba = pci_resource_start(dev, SMBBAR); | |
487 | if (!i801_smba) { | |
488 | dev_err(&dev->dev, "SMBus base address uninitialized, " | |
489 | "upgrade BIOS\n"); | |
490 | err = -ENODEV; | |
d6fcb3b9 | 491 | goto exit; |
02dd7ae2 JD |
492 | } |
493 | ||
494 | err = pci_request_region(dev, SMBBAR, i801_driver.name); | |
495 | if (err) { | |
496 | dev_err(&dev->dev, "Failed to request SMBus region " | |
497 | "0x%lx-0x%lx\n", i801_smba, | |
498 | pci_resource_end(dev, SMBBAR)); | |
d6fcb3b9 | 499 | goto exit; |
02dd7ae2 JD |
500 | } |
501 | ||
502 | pci_read_config_byte(I801_dev, SMBHSTCFG, &temp); | |
503 | temp &= ~SMBHSTCFG_I2C_EN; /* SMBus timing */ | |
504 | if (!(temp & SMBHSTCFG_HST_EN)) { | |
505 | dev_info(&dev->dev, "Enabling SMBus device\n"); | |
506 | temp |= SMBHSTCFG_HST_EN; | |
507 | } | |
508 | pci_write_config_byte(I801_dev, SMBHSTCFG, temp); | |
509 | ||
510 | if (temp & SMBHSTCFG_SMB_SMI_EN) | |
511 | dev_dbg(&dev->dev, "SMBus using interrupt SMI#\n"); | |
512 | else | |
513 | dev_dbg(&dev->dev, "SMBus using PCI Interrupt\n"); | |
1da177e4 LT |
514 | |
515 | /* set up the driverfs linkage to our parent device */ | |
516 | i801_adapter.dev.parent = &dev->dev; | |
517 | ||
518 | snprintf(i801_adapter.name, I2C_NAME_SIZE, | |
6dcc19df | 519 | "SMBus I801 adapter at %04lx", i801_smba); |
02dd7ae2 JD |
520 | err = i2c_add_adapter(&i801_adapter); |
521 | if (err) { | |
522 | dev_err(&dev->dev, "Failed to add SMBus adapter\n"); | |
d6fcb3b9 | 523 | goto exit_release; |
02dd7ae2 | 524 | } |
d6fcb3b9 | 525 | return 0; |
02dd7ae2 | 526 | |
d6fcb3b9 DR |
527 | exit_release: |
528 | pci_release_region(dev, SMBBAR); | |
02dd7ae2 JD |
529 | exit: |
530 | return err; | |
1da177e4 LT |
531 | } |
532 | ||
533 | static void __devexit i801_remove(struct pci_dev *dev) | |
534 | { | |
535 | i2c_del_adapter(&i801_adapter); | |
6dcc19df | 536 | pci_release_region(dev, SMBBAR); |
d6fcb3b9 DR |
537 | /* |
538 | * do not call pci_disable_device(dev) since it can cause hard hangs on | |
539 | * some systems during power-off (eg. Fujitsu-Siemens Lifebook E8010) | |
540 | */ | |
1da177e4 LT |
541 | } |
542 | ||
543 | static struct pci_driver i801_driver = { | |
544 | .name = "i801_smbus", | |
545 | .id_table = i801_ids, | |
546 | .probe = i801_probe, | |
547 | .remove = __devexit_p(i801_remove), | |
548 | }; | |
549 | ||
550 | static int __init i2c_i801_init(void) | |
551 | { | |
552 | return pci_register_driver(&i801_driver); | |
553 | } | |
554 | ||
555 | static void __exit i2c_i801_exit(void) | |
556 | { | |
557 | pci_unregister_driver(&i801_driver); | |
558 | } | |
559 | ||
560 | MODULE_AUTHOR ("Frodo Looijaard <frodol@dds.nl>, " | |
561 | "Philip Edelbrock <phil@netroedge.com>, " | |
562 | "and Mark D. Studebaker <mdsxyz123@yahoo.com>"); | |
563 | MODULE_DESCRIPTION("I801 SMBus driver"); | |
564 | MODULE_LICENSE("GPL"); | |
565 | ||
566 | module_init(i2c_i801_init); | |
567 | module_exit(i2c_i801_exit); |