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1da177e4 LT |
1 | /** |
2 | * i2c-ali1563.c - i2c driver for the ALi 1563 Southbridge | |
3 | * | |
4 | * Copyright (C) 2004 Patrick Mochel | |
5 | * | |
6 | * The 1563 southbridge is deceptively similar to the 1533, with a | |
7 | * few notable exceptions. One of those happens to be the fact they | |
8 | * upgraded the i2c core to be 2.0 compliant, and happens to be almost | |
9 | * identical to the i2c controller found in the Intel 801 south | |
10 | * bridges. | |
11 | * | |
12 | * This driver is based on a mix of the 15x3, 1535, and i801 drivers, | |
13 | * with a little help from the ALi 1563 spec. | |
14 | * | |
15 | * This file is released under the GPLv2 | |
16 | */ | |
17 | ||
18 | #include <linux/module.h> | |
19 | #include <linux/delay.h> | |
20 | #include <linux/i2c.h> | |
21 | #include <linux/pci.h> | |
22 | #include <linux/init.h> | |
23 | ||
24 | #define ALI1563_MAX_TIMEOUT 500 | |
25 | #define ALI1563_SMBBA 0x80 | |
26 | #define ALI1563_SMB_IOEN 1 | |
27 | #define ALI1563_SMB_HOSTEN 2 | |
28 | #define ALI1563_SMB_IOSIZE 16 | |
29 | ||
30 | #define SMB_HST_STS (ali1563_smba + 0) | |
31 | #define SMB_HST_CNTL1 (ali1563_smba + 1) | |
32 | #define SMB_HST_CNTL2 (ali1563_smba + 2) | |
33 | #define SMB_HST_CMD (ali1563_smba + 3) | |
34 | #define SMB_HST_ADD (ali1563_smba + 4) | |
35 | #define SMB_HST_DAT0 (ali1563_smba + 5) | |
36 | #define SMB_HST_DAT1 (ali1563_smba + 6) | |
37 | #define SMB_BLK_DAT (ali1563_smba + 7) | |
38 | ||
39 | #define HST_STS_BUSY 0x01 | |
40 | #define HST_STS_INTR 0x02 | |
41 | #define HST_STS_DEVERR 0x04 | |
42 | #define HST_STS_BUSERR 0x08 | |
43 | #define HST_STS_FAIL 0x10 | |
44 | #define HST_STS_DONE 0x80 | |
45 | #define HST_STS_BAD 0x1c | |
46 | ||
47 | ||
48 | #define HST_CNTL1_TIMEOUT 0x80 | |
49 | #define HST_CNTL1_LAST 0x40 | |
50 | ||
51 | #define HST_CNTL2_KILL 0x04 | |
52 | #define HST_CNTL2_START 0x40 | |
53 | #define HST_CNTL2_QUICK 0x00 | |
54 | #define HST_CNTL2_BYTE 0x01 | |
55 | #define HST_CNTL2_BYTE_DATA 0x02 | |
56 | #define HST_CNTL2_WORD_DATA 0x03 | |
57 | #define HST_CNTL2_BLOCK 0x05 | |
58 | ||
59 | ||
60 | ||
61 | static unsigned short ali1563_smba; | |
62 | ||
63 | static int ali1563_transaction(struct i2c_adapter * a) | |
64 | { | |
65 | u32 data; | |
66 | int timeout; | |
67 | ||
68 | dev_dbg(&a->dev, "Transaction (pre): STS=%02x, CNTL1=%02x, " | |
69 | "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n", | |
70 | inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2), | |
71 | inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0), | |
72 | inb_p(SMB_HST_DAT1)); | |
73 | ||
74 | data = inb_p(SMB_HST_STS); | |
75 | if (data & HST_STS_BAD) { | |
76 | dev_warn(&a->dev,"ali1563: Trying to reset busy device\n"); | |
77 | outb_p(data | HST_STS_BAD,SMB_HST_STS); | |
78 | data = inb_p(SMB_HST_STS); | |
79 | if (data & HST_STS_BAD) | |
80 | return -EBUSY; | |
81 | } | |
82 | outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2); | |
83 | ||
84 | timeout = ALI1563_MAX_TIMEOUT; | |
85 | do | |
86 | msleep(1); | |
87 | while (((data = inb_p(SMB_HST_STS)) & HST_STS_BUSY) && --timeout); | |
88 | ||
89 | dev_dbg(&a->dev, "Transaction (post): STS=%02x, CNTL1=%02x, " | |
90 | "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n", | |
91 | inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2), | |
92 | inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0), | |
93 | inb_p(SMB_HST_DAT1)); | |
94 | ||
95 | if (timeout && !(data & HST_STS_BAD)) | |
96 | return 0; | |
97 | dev_warn(&a->dev, "SMBus Error: %s%s%s%s%s\n", | |
98 | timeout ? "Timeout " : "", | |
99 | data & HST_STS_FAIL ? "Transaction Failed " : "", | |
100 | data & HST_STS_BUSERR ? "No response or Bus Collision " : "", | |
101 | data & HST_STS_DEVERR ? "Device Error " : "", | |
102 | !(data & HST_STS_DONE) ? "Transaction Never Finished " : ""); | |
103 | ||
104 | if (!(data & HST_STS_DONE)) | |
105 | /* Issue 'kill' to host controller */ | |
106 | outb_p(HST_CNTL2_KILL,SMB_HST_CNTL2); | |
107 | else | |
108 | /* Issue timeout to reset all devices on bus */ | |
109 | outb_p(HST_CNTL1_TIMEOUT,SMB_HST_CNTL1); | |
110 | return -1; | |
111 | } | |
112 | ||
113 | static int ali1563_block_start(struct i2c_adapter * a) | |
114 | { | |
115 | u32 data; | |
116 | int timeout; | |
117 | ||
118 | dev_dbg(&a->dev, "Block (pre): STS=%02x, CNTL1=%02x, " | |
119 | "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n", | |
120 | inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2), | |
121 | inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0), | |
122 | inb_p(SMB_HST_DAT1)); | |
123 | ||
124 | data = inb_p(SMB_HST_STS); | |
125 | if (data & HST_STS_BAD) { | |
126 | dev_warn(&a->dev,"ali1563: Trying to reset busy device\n"); | |
127 | outb_p(data | HST_STS_BAD,SMB_HST_STS); | |
128 | data = inb_p(SMB_HST_STS); | |
129 | if (data & HST_STS_BAD) | |
130 | return -EBUSY; | |
131 | } | |
132 | ||
133 | /* Clear byte-ready bit */ | |
134 | outb_p(data | HST_STS_DONE, SMB_HST_STS); | |
135 | ||
136 | /* Start transaction and wait for byte-ready bit to be set */ | |
137 | outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2); | |
138 | ||
139 | timeout = ALI1563_MAX_TIMEOUT; | |
140 | do | |
141 | msleep(1); | |
142 | while (!((data = inb_p(SMB_HST_STS)) & HST_STS_DONE) && --timeout); | |
143 | ||
144 | dev_dbg(&a->dev, "Block (post): STS=%02x, CNTL1=%02x, " | |
145 | "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n", | |
146 | inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2), | |
147 | inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0), | |
148 | inb_p(SMB_HST_DAT1)); | |
149 | ||
150 | if (timeout && !(data & HST_STS_BAD)) | |
151 | return 0; | |
152 | dev_warn(&a->dev, "SMBus Error: %s%s%s%s%s\n", | |
153 | timeout ? "Timeout " : "", | |
154 | data & HST_STS_FAIL ? "Transaction Failed " : "", | |
155 | data & HST_STS_BUSERR ? "No response or Bus Collision " : "", | |
156 | data & HST_STS_DEVERR ? "Device Error " : "", | |
157 | !(data & HST_STS_DONE) ? "Transaction Never Finished " : ""); | |
158 | return -1; | |
159 | } | |
160 | ||
161 | static int ali1563_block(struct i2c_adapter * a, union i2c_smbus_data * data, u8 rw) | |
162 | { | |
163 | int i, len; | |
164 | int error = 0; | |
165 | ||
166 | /* Do we need this? */ | |
167 | outb_p(HST_CNTL1_LAST,SMB_HST_CNTL1); | |
168 | ||
169 | if (rw == I2C_SMBUS_WRITE) { | |
170 | len = data->block[0]; | |
171 | if (len < 1) | |
172 | len = 1; | |
173 | else if (len > 32) | |
174 | len = 32; | |
175 | outb_p(len,SMB_HST_DAT0); | |
176 | outb_p(data->block[1],SMB_BLK_DAT); | |
177 | } else | |
178 | len = 32; | |
179 | ||
180 | outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_BLOCK, SMB_HST_CNTL2); | |
181 | ||
182 | for (i = 0; i < len; i++) { | |
183 | if (rw == I2C_SMBUS_WRITE) { | |
184 | outb_p(data->block[i + 1], SMB_BLK_DAT); | |
185 | if ((error = ali1563_block_start(a))) | |
186 | break; | |
187 | } else { | |
188 | if ((error = ali1563_block_start(a))) | |
189 | break; | |
190 | if (i == 0) { | |
191 | len = inb_p(SMB_HST_DAT0); | |
192 | if (len < 1) | |
193 | len = 1; | |
194 | else if (len > 32) | |
195 | len = 32; | |
196 | } | |
197 | data->block[i+1] = inb_p(SMB_BLK_DAT); | |
198 | } | |
199 | } | |
200 | /* Do we need this? */ | |
201 | outb_p(HST_CNTL1_LAST,SMB_HST_CNTL1); | |
202 | return error; | |
203 | } | |
204 | ||
205 | static s32 ali1563_access(struct i2c_adapter * a, u16 addr, | |
206 | unsigned short flags, char rw, u8 cmd, | |
207 | int size, union i2c_smbus_data * data) | |
208 | { | |
209 | int error = 0; | |
210 | int timeout; | |
211 | u32 reg; | |
212 | ||
213 | for (timeout = ALI1563_MAX_TIMEOUT; timeout; timeout--) { | |
214 | if (!(reg = inb_p(SMB_HST_STS) & HST_STS_BUSY)) | |
215 | break; | |
216 | } | |
217 | if (!timeout) | |
218 | dev_warn(&a->dev,"SMBus not idle. HST_STS = %02x\n",reg); | |
219 | outb_p(0xff,SMB_HST_STS); | |
220 | ||
221 | /* Map the size to what the chip understands */ | |
222 | switch (size) { | |
223 | case I2C_SMBUS_PROC_CALL: | |
224 | dev_err(&a->dev, "I2C_SMBUS_PROC_CALL not supported!\n"); | |
225 | error = -EINVAL; | |
226 | break; | |
227 | case I2C_SMBUS_QUICK: | |
228 | size = HST_CNTL2_QUICK; | |
229 | break; | |
230 | case I2C_SMBUS_BYTE: | |
231 | size = HST_CNTL2_BYTE; | |
232 | break; | |
233 | case I2C_SMBUS_BYTE_DATA: | |
234 | size = HST_CNTL2_BYTE_DATA; | |
235 | break; | |
236 | case I2C_SMBUS_WORD_DATA: | |
237 | size = HST_CNTL2_WORD_DATA; | |
238 | break; | |
239 | case I2C_SMBUS_BLOCK_DATA: | |
240 | size = HST_CNTL2_BLOCK; | |
241 | break; | |
242 | } | |
243 | ||
244 | outb_p(((addr & 0x7f) << 1) | (rw & 0x01), SMB_HST_ADD); | |
245 | outb_p(inb_p(SMB_HST_CNTL2) | (size << 3), SMB_HST_CNTL2); | |
246 | ||
247 | /* Write the command register */ | |
248 | switch(size) { | |
249 | case HST_CNTL2_BYTE: | |
250 | if (rw== I2C_SMBUS_WRITE) | |
251 | outb_p(cmd, SMB_HST_CMD); | |
252 | break; | |
253 | case HST_CNTL2_BYTE_DATA: | |
254 | outb_p(cmd, SMB_HST_CMD); | |
255 | if (rw == I2C_SMBUS_WRITE) | |
256 | outb_p(data->byte, SMB_HST_DAT0); | |
257 | break; | |
258 | case HST_CNTL2_WORD_DATA: | |
259 | outb_p(cmd, SMB_HST_CMD); | |
260 | if (rw == I2C_SMBUS_WRITE) { | |
261 | outb_p(data->word & 0xff, SMB_HST_DAT0); | |
262 | outb_p((data->word & 0xff00) >> 8, SMB_HST_DAT1); | |
263 | } | |
264 | break; | |
265 | case HST_CNTL2_BLOCK: | |
266 | outb_p(cmd, SMB_HST_CMD); | |
267 | error = ali1563_block(a,data,rw); | |
268 | goto Done; | |
269 | } | |
270 | ||
271 | if ((error = ali1563_transaction(a))) | |
272 | goto Done; | |
273 | ||
274 | if ((rw == I2C_SMBUS_WRITE) || (size == HST_CNTL2_QUICK)) | |
275 | goto Done; | |
276 | ||
277 | switch (size) { | |
278 | case HST_CNTL2_BYTE: /* Result put in SMBHSTDAT0 */ | |
279 | data->byte = inb_p(SMB_HST_DAT0); | |
280 | break; | |
281 | case HST_CNTL2_BYTE_DATA: | |
282 | data->byte = inb_p(SMB_HST_DAT0); | |
283 | break; | |
284 | case HST_CNTL2_WORD_DATA: | |
285 | data->word = inb_p(SMB_HST_DAT0) + (inb_p(SMB_HST_DAT1) << 8); | |
286 | break; | |
287 | } | |
288 | Done: | |
289 | return error; | |
290 | } | |
291 | ||
292 | static u32 ali1563_func(struct i2c_adapter * a) | |
293 | { | |
294 | return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | | |
295 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | | |
296 | I2C_FUNC_SMBUS_BLOCK_DATA; | |
297 | } | |
298 | ||
299 | ||
300 | static void ali1563_enable(struct pci_dev * dev) | |
301 | { | |
302 | u16 ctrl; | |
303 | ||
304 | pci_read_config_word(dev,ALI1563_SMBBA,&ctrl); | |
305 | ctrl |= 0x7; | |
306 | pci_write_config_word(dev,ALI1563_SMBBA,ctrl); | |
307 | } | |
308 | ||
309 | static int __devinit ali1563_setup(struct pci_dev * dev) | |
310 | { | |
311 | u16 ctrl; | |
312 | ||
313 | pci_read_config_word(dev,ALI1563_SMBBA,&ctrl); | |
314 | printk("ali1563: SMBus control = %04x\n",ctrl); | |
315 | ||
316 | /* Check if device is even enabled first */ | |
317 | if (!(ctrl & ALI1563_SMB_IOEN)) { | |
318 | dev_warn(&dev->dev,"I/O space not enabled, trying manually\n"); | |
319 | ali1563_enable(dev); | |
320 | } | |
321 | if (!(ctrl & ALI1563_SMB_IOEN)) { | |
322 | dev_warn(&dev->dev,"I/O space still not enabled, giving up\n"); | |
323 | goto Err; | |
324 | } | |
325 | if (!(ctrl & ALI1563_SMB_HOSTEN)) { | |
326 | dev_warn(&dev->dev,"Host Controller not enabled\n"); | |
327 | goto Err; | |
328 | } | |
329 | ||
330 | /* SMB I/O Base in high 12 bits and must be aligned with the | |
331 | * size of the I/O space. */ | |
332 | ali1563_smba = ctrl & ~(ALI1563_SMB_IOSIZE - 1); | |
333 | if (!ali1563_smba) { | |
334 | dev_warn(&dev->dev,"ali1563_smba Uninitialized\n"); | |
335 | goto Err; | |
336 | } | |
337 | if (!request_region(ali1563_smba,ALI1563_SMB_IOSIZE,"i2c-ali1563")) { | |
338 | dev_warn(&dev->dev,"Could not allocate I/O space"); | |
339 | goto Err; | |
340 | } | |
341 | ||
342 | return 0; | |
343 | Err: | |
344 | return -ENODEV; | |
345 | } | |
346 | ||
347 | static void ali1563_shutdown(struct pci_dev *dev) | |
348 | { | |
349 | release_region(ali1563_smba,ALI1563_SMB_IOSIZE); | |
350 | } | |
351 | ||
352 | static struct i2c_algorithm ali1563_algorithm = { | |
353 | .name = "Non-i2c SMBus adapter", | |
354 | .id = I2C_ALGO_SMBUS, | |
355 | .smbus_xfer = ali1563_access, | |
356 | .functionality = ali1563_func, | |
357 | }; | |
358 | ||
359 | static struct i2c_adapter ali1563_adapter = { | |
360 | .owner = THIS_MODULE, | |
361 | .class = I2C_CLASS_HWMON, | |
362 | .algo = &ali1563_algorithm, | |
363 | }; | |
364 | ||
365 | static int __devinit ali1563_probe(struct pci_dev * dev, | |
366 | const struct pci_device_id * id_table) | |
367 | { | |
368 | int error; | |
369 | ||
370 | if ((error = ali1563_setup(dev))) | |
371 | return error; | |
372 | ali1563_adapter.dev.parent = &dev->dev; | |
373 | sprintf(ali1563_adapter.name,"SMBus ALi 1563 Adapter @ %04x", | |
374 | ali1563_smba); | |
375 | if ((error = i2c_add_adapter(&ali1563_adapter))) | |
376 | ali1563_shutdown(dev); | |
377 | printk("%s: Returning %d\n",__FUNCTION__,error); | |
378 | return error; | |
379 | } | |
380 | ||
381 | static void __devexit ali1563_remove(struct pci_dev * dev) | |
382 | { | |
383 | i2c_del_adapter(&ali1563_adapter); | |
384 | ali1563_shutdown(dev); | |
385 | } | |
386 | ||
387 | static struct pci_device_id __devinitdata ali1563_id_table[] = { | |
388 | { PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1563) }, | |
389 | {}, | |
390 | }; | |
391 | ||
392 | MODULE_DEVICE_TABLE (pci, ali1563_id_table); | |
393 | ||
394 | static struct pci_driver ali1563_pci_driver = { | |
395 | .name = "ali1563_i2c", | |
396 | .id_table = ali1563_id_table, | |
397 | .probe = ali1563_probe, | |
398 | .remove = __devexit_p(ali1563_remove), | |
399 | }; | |
400 | ||
401 | static int __init ali1563_init(void) | |
402 | { | |
403 | return pci_register_driver(&ali1563_pci_driver); | |
404 | } | |
405 | ||
406 | module_init(ali1563_init); | |
407 | ||
408 | static void __exit ali1563_exit(void) | |
409 | { | |
410 | pci_unregister_driver(&ali1563_pci_driver); | |
411 | } | |
412 | ||
413 | module_exit(ali1563_exit); | |
414 | ||
415 | MODULE_LICENSE("GPL"); |