?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
MIPS: Yosemite, Emma: Fix off-by-two in arcs_cmdline buffer size check
[linux-2.6/linux-mips.git] / drivers / i2c / busses / i2c-amd8111.c
blob6b6a6b1d70252539f6be0c0da874281d624d817e
1 /*
2 * SMBus 2.0 driver for AMD-8111 IO-Hub.
3 *
4 * Copyright (c) 2002 Vojtech Pavlik
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation version 2.
9 */
10
11 #include <linux/module.h>
12 #include <linux/pci.h>
13 #include <linux/kernel.h>
14 #include <linux/stddef.h>
15 #include <linux/ioport.h>
16 #include <linux/init.h>
17 #include <linux/i2c.h>
18 #include <linux/delay.h>
19 #include <linux/acpi.h>
20 #include <linux/slab.h>
21 #include <linux/io.h>
22
23 MODULE_LICENSE("GPL");
24 MODULE_AUTHOR ("Vojtech Pavlik <vojtech@suse.cz>");
25 MODULE_DESCRIPTION("AMD8111 SMBus 2.0 driver");
26
27 struct amd_smbus {
28 struct pci_dev *dev;
29 struct i2c_adapter adapter;
30 int base;
31 int size;
32 };
33
34 static struct pci_driver amd8111_driver;
35
36 /*
37 * AMD PCI control registers definitions.
38 */
39
40 #define AMD_PCI_MISC 0x48
41
42 #define AMD_PCI_MISC_SCI 0x04 /* deliver SCI */
43 #define AMD_PCI_MISC_INT 0x02 /* deliver PCI IRQ */
44 #define AMD_PCI_MISC_SPEEDUP 0x01 /* 16x clock speedup */
45
46 /*
47 * ACPI 2.0 chapter 13 PCI interface definitions.
48 */
49
50 #define AMD_EC_DATA 0x00 /* data register */
51 #define AMD_EC_SC 0x04 /* status of controller */
52 #define AMD_EC_CMD 0x04 /* command register */
53 #define AMD_EC_ICR 0x08 /* interrupt control register */
54
55 #define AMD_EC_SC_SMI 0x04 /* smi event pending */
56 #define AMD_EC_SC_SCI 0x02 /* sci event pending */
57 #define AMD_EC_SC_BURST 0x01 /* burst mode enabled */
58 #define AMD_EC_SC_CMD 0x08 /* byte in data reg is command */
59 #define AMD_EC_SC_IBF 0x02 /* data ready for embedded controller */
60 #define AMD_EC_SC_OBF 0x01 /* data ready for host */
61
62 #define AMD_EC_CMD_RD 0x80 /* read EC */
63 #define AMD_EC_CMD_WR 0x81 /* write EC */
64 #define AMD_EC_CMD_BE 0x82 /* enable burst mode */
65 #define AMD_EC_CMD_BD 0x83 /* disable burst mode */
66 #define AMD_EC_CMD_QR 0x84 /* query EC */
67
68 /*
69 * ACPI 2.0 chapter 13 access of registers of the EC
70 */
71
72 static int amd_ec_wait_write(struct amd_smbus *smbus)
73 {
74 int timeout = 500;
75
76 while ((inb(smbus->base + AMD_EC_SC) & AMD_EC_SC_IBF) && --timeout)
77 udelay(1);
78
79 if (!timeout) {
80 dev_warn(&smbus->dev->dev,
81 "Timeout while waiting for IBF to clear\n");
82 return -ETIMEDOUT;
83 }
84
85 return 0;
86 }
87
88 static int amd_ec_wait_read(struct amd_smbus *smbus)
89 {
90 int timeout = 500;
91
92 while ((~inb(smbus->base + AMD_EC_SC) & AMD_EC_SC_OBF) && --timeout)
93 udelay(1);
94
95 if (!timeout) {
96 dev_warn(&smbus->dev->dev,
97 "Timeout while waiting for OBF to set\n");
98 return -ETIMEDOUT;
99 }
100
101 return 0;
102 }
103
104 static int amd_ec_read(struct amd_smbus *smbus, unsigned char address,
105 unsigned char *data)
106 {
107 int status;
108
109 status = amd_ec_wait_write(smbus);
110 if (status)
111 return status;
112 outb(AMD_EC_CMD_RD, smbus->base + AMD_EC_CMD);
113
114 status = amd_ec_wait_write(smbus);
115 if (status)
116 return status;
117 outb(address, smbus->base + AMD_EC_DATA);
118
119 status = amd_ec_wait_read(smbus);
120 if (status)
121 return status;
122 *data = inb(smbus->base + AMD_EC_DATA);
123
124 return 0;
125 }
126
127 static int amd_ec_write(struct amd_smbus *smbus, unsigned char address,
128 unsigned char data)
129 {
130 int status;
131
132 status = amd_ec_wait_write(smbus);
133 if (status)
134 return status;
135 outb(AMD_EC_CMD_WR, smbus->base + AMD_EC_CMD);
136
137 status = amd_ec_wait_write(smbus);
138 if (status)
139 return status;
140 outb(address, smbus->base + AMD_EC_DATA);
141
142 status = amd_ec_wait_write(smbus);
143 if (status)
144 return status;
145 outb(data, smbus->base + AMD_EC_DATA);
146
147 return 0;
148 }
149
150 /*
151 * ACPI 2.0 chapter 13 SMBus 2.0 EC register model
152 */
153
154 #define AMD_SMB_PRTCL 0x00 /* protocol, PEC */
155 #define AMD_SMB_STS 0x01 /* status */
156 #define AMD_SMB_ADDR 0x02 /* address */
157 #define AMD_SMB_CMD 0x03 /* command */
158 #define AMD_SMB_DATA 0x04 /* 32 data registers */
159 #define AMD_SMB_BCNT 0x24 /* number of data bytes */
160 #define AMD_SMB_ALRM_A 0x25 /* alarm address */
161 #define AMD_SMB_ALRM_D 0x26 /* 2 bytes alarm data */
162
163 #define AMD_SMB_STS_DONE 0x80
164 #define AMD_SMB_STS_ALRM 0x40
165 #define AMD_SMB_STS_RES 0x20
166 #define AMD_SMB_STS_STATUS 0x1f
167
168 #define AMD_SMB_STATUS_OK 0x00
169 #define AMD_SMB_STATUS_FAIL 0x07
170 #define AMD_SMB_STATUS_DNAK 0x10
171 #define AMD_SMB_STATUS_DERR 0x11
172 #define AMD_SMB_STATUS_CMD_DENY 0x12
173 #define AMD_SMB_STATUS_UNKNOWN 0x13
174 #define AMD_SMB_STATUS_ACC_DENY 0x17
175 #define AMD_SMB_STATUS_TIMEOUT 0x18
176 #define AMD_SMB_STATUS_NOTSUP 0x19
177 #define AMD_SMB_STATUS_BUSY 0x1A
178 #define AMD_SMB_STATUS_PEC 0x1F
179
180 #define AMD_SMB_PRTCL_WRITE 0x00
181 #define AMD_SMB_PRTCL_READ 0x01
182 #define AMD_SMB_PRTCL_QUICK 0x02
183 #define AMD_SMB_PRTCL_BYTE 0x04
184 #define AMD_SMB_PRTCL_BYTE_DATA 0x06
185 #define AMD_SMB_PRTCL_WORD_DATA 0x08
186 #define AMD_SMB_PRTCL_BLOCK_DATA 0x0a
187 #define AMD_SMB_PRTCL_PROC_CALL 0x0c
188 #define AMD_SMB_PRTCL_BLOCK_PROC_CALL 0x0d
189 #define AMD_SMB_PRTCL_I2C_BLOCK_DATA 0x4a
190 #define AMD_SMB_PRTCL_PEC 0x80
191
192
193 static s32 amd8111_access(struct i2c_adapter * adap, u16 addr,
194 unsigned short flags, char read_write, u8 command, int size,
195 union i2c_smbus_data * data)
196 {
197 struct amd_smbus *smbus = adap->algo_data;
198 unsigned char protocol, len, pec, temp[2];
199 int i, status;
200
201 protocol = (read_write == I2C_SMBUS_READ) ? AMD_SMB_PRTCL_READ
202 : AMD_SMB_PRTCL_WRITE;
203 pec = (flags & I2C_CLIENT_PEC) ? AMD_SMB_PRTCL_PEC : 0;
204
205 switch (size) {
206 case I2C_SMBUS_QUICK:
207 protocol |= AMD_SMB_PRTCL_QUICK;
208 read_write = I2C_SMBUS_WRITE;
209 break;
210
211 case I2C_SMBUS_BYTE:
212 if (read_write == I2C_SMBUS_WRITE) {
213 status = amd_ec_write(smbus, AMD_SMB_CMD,
214 command);
215 if (status)
216 return status;
217 }
218 protocol |= AMD_SMB_PRTCL_BYTE;
219 break;
220
221 case I2C_SMBUS_BYTE_DATA:
222 status = amd_ec_write(smbus, AMD_SMB_CMD, command);
223 if (status)
224 return status;
225 if (read_write == I2C_SMBUS_WRITE) {
226 status = amd_ec_write(smbus, AMD_SMB_DATA,
227 data->byte);
228 if (status)
229 return status;
230 }
231 protocol |= AMD_SMB_PRTCL_BYTE_DATA;
232 break;
233
234 case I2C_SMBUS_WORD_DATA:
235 status = amd_ec_write(smbus, AMD_SMB_CMD, command);
236 if (status)
237 return status;
238 if (read_write == I2C_SMBUS_WRITE) {
239 status = amd_ec_write(smbus, AMD_SMB_DATA,
240 data->word & 0xff);
241 if (status)
242 return status;
243 status = amd_ec_write(smbus, AMD_SMB_DATA + 1,
244 data->word >> 8);
245 if (status)
246 return status;
247 }
248 protocol |= AMD_SMB_PRTCL_WORD_DATA | pec;
249 break;
250
251 case I2C_SMBUS_BLOCK_DATA:
252 status = amd_ec_write(smbus, AMD_SMB_CMD, command);
253 if (status)
254 return status;
255 if (read_write == I2C_SMBUS_WRITE) {
256 len = min_t(u8, data->block[0],
257 I2C_SMBUS_BLOCK_MAX);
258 status = amd_ec_write(smbus, AMD_SMB_BCNT, len);
259 if (status)
260 return status;
261 for (i = 0; i < len; i++) {
262 status =
263 amd_ec_write(smbus, AMD_SMB_DATA + i,
264 data->block[i + 1]);
265 if (status)
266 return status;
267 }
268 }
269 protocol |= AMD_SMB_PRTCL_BLOCK_DATA | pec;
270 break;
271
272 case I2C_SMBUS_I2C_BLOCK_DATA:
273 len = min_t(u8, data->block[0],
274 I2C_SMBUS_BLOCK_MAX);
275 status = amd_ec_write(smbus, AMD_SMB_CMD, command);
276 if (status)
277 return status;
278 status = amd_ec_write(smbus, AMD_SMB_BCNT, len);
279 if (status)
280 return status;
281 if (read_write == I2C_SMBUS_WRITE)
282 for (i = 0; i < len; i++) {
283 status =
284 amd_ec_write(smbus, AMD_SMB_DATA + i,
285 data->block[i + 1]);
286 if (status)
287 return status;
288 }
289 protocol |= AMD_SMB_PRTCL_I2C_BLOCK_DATA;
290 break;
291
292 case I2C_SMBUS_PROC_CALL:
293 status = amd_ec_write(smbus, AMD_SMB_CMD, command);
294 if (status)
295 return status;
296 status = amd_ec_write(smbus, AMD_SMB_DATA,
297 data->word & 0xff);
298 if (status)
299 return status;
300 status = amd_ec_write(smbus, AMD_SMB_DATA + 1,
301 data->word >> 8);
302 if (status)
303 return status;
304 protocol = AMD_SMB_PRTCL_PROC_CALL | pec;
305 read_write = I2C_SMBUS_READ;
306 break;
307
308 case I2C_SMBUS_BLOCK_PROC_CALL:
309 len = min_t(u8, data->block[0],
310 I2C_SMBUS_BLOCK_MAX - 1);
311 status = amd_ec_write(smbus, AMD_SMB_CMD, command);
312 if (status)
313 return status;
314 status = amd_ec_write(smbus, AMD_SMB_BCNT, len);
315 if (status)
316 return status;
317 for (i = 0; i < len; i++) {
318 status = amd_ec_write(smbus, AMD_SMB_DATA + i,
319 data->block[i + 1]);
320 if (status)
321 return status;
322 }
323 protocol = AMD_SMB_PRTCL_BLOCK_PROC_CALL | pec;
324 read_write = I2C_SMBUS_READ;
325 break;
326
327 default:
328 dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
329 return -EOPNOTSUPP;
330 }
331
332 status = amd_ec_write(smbus, AMD_SMB_ADDR, addr << 1);
333 if (status)
334 return status;
335 status = amd_ec_write(smbus, AMD_SMB_PRTCL, protocol);
336 if (status)
337 return status;
338
339 status = amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
340 if (status)
341 return status;
342
343 if (~temp[0] & AMD_SMB_STS_DONE) {
344 udelay(500);
345 status = amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
346 if (status)
347 return status;
348 }
349
350 if (~temp[0] & AMD_SMB_STS_DONE) {
351 msleep(1);
352 status = amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
353 if (status)
354 return status;
355 }
356
357 if ((~temp[0] & AMD_SMB_STS_DONE) || (temp[0] & AMD_SMB_STS_STATUS))
358 return -EIO;
359
360 if (read_write == I2C_SMBUS_WRITE)
361 return 0;
362
363 switch (size) {
364 case I2C_SMBUS_BYTE:
365 case I2C_SMBUS_BYTE_DATA:
366 status = amd_ec_read(smbus, AMD_SMB_DATA, &data->byte);
367 if (status)
368 return status;
369 break;
370
371 case I2C_SMBUS_WORD_DATA:
372 case I2C_SMBUS_PROC_CALL:
373 status = amd_ec_read(smbus, AMD_SMB_DATA, temp + 0);
374 if (status)
375 return status;
376 status = amd_ec_read(smbus, AMD_SMB_DATA + 1, temp + 1);
377 if (status)
378 return status;
379 data->word = (temp[1] << 8) | temp[0];
380 break;
381
382 case I2C_SMBUS_BLOCK_DATA:
383 case I2C_SMBUS_BLOCK_PROC_CALL:
384 status = amd_ec_read(smbus, AMD_SMB_BCNT, &len);
385 if (status)
386 return status;
387 len = min_t(u8, len, I2C_SMBUS_BLOCK_MAX);
388 case I2C_SMBUS_I2C_BLOCK_DATA:
389 for (i = 0; i < len; i++) {
390 status = amd_ec_read(smbus, AMD_SMB_DATA + i,
391 data->block + i + 1);
392 if (status)
393 return status;
394 }
395 data->block[0] = len;
396 break;
397 }
398
399 return 0;
400 }
401
402
403 static u32 amd8111_func(struct i2c_adapter *adapter)
404 {
405 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
406 I2C_FUNC_SMBUS_BYTE_DATA |
407 I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_BLOCK_DATA |
408 I2C_FUNC_SMBUS_PROC_CALL | I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
409 I2C_FUNC_SMBUS_I2C_BLOCK | I2C_FUNC_SMBUS_PEC;
410 }
411
412 static const struct i2c_algorithm smbus_algorithm = {
413 .smbus_xfer = amd8111_access,
414 .functionality = amd8111_func,
415 };
416
417
418 static const struct pci_device_id amd8111_ids[] = {
419 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS2) },
420 { 0, }
421 };
422
423 MODULE_DEVICE_TABLE (pci, amd8111_ids);
424
425 static int __devinit amd8111_probe(struct pci_dev *dev,
426 const struct pci_device_id *id)
427 {
428 struct amd_smbus *smbus;
429 int error;
430
431 if (!(pci_resource_flags(dev, 0) & IORESOURCE_IO))
432 return -ENODEV;
433
434 smbus = kzalloc(sizeof(struct amd_smbus), GFP_KERNEL);
435 if (!smbus)
436 return -ENOMEM;
437
438 smbus->dev = dev;
439 smbus->base = pci_resource_start(dev, 0);
440 smbus->size = pci_resource_len(dev, 0);
441
442 error = acpi_check_resource_conflict(&dev->resource[0]);
443 if (error) {
444 error = -ENODEV;
445 goto out_kfree;
446 }
447
448 if (!request_region(smbus->base, smbus->size, amd8111_driver.name)) {
449 error = -EBUSY;
450 goto out_kfree;
451 }
452
453 smbus->adapter.owner = THIS_MODULE;
454 snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),
455 "SMBus2 AMD8111 adapter at %04x", smbus->base);
456 smbus->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
457 smbus->adapter.algo = &smbus_algorithm;
458 smbus->adapter.algo_data = smbus;
459
460 /* set up the sysfs linkage to our parent device */
461 smbus->adapter.dev.parent = &dev->dev;
462
463 pci_write_config_dword(smbus->dev, AMD_PCI_MISC, 0);
464 error = i2c_add_adapter(&smbus->adapter);
465 if (error)
466 goto out_release_region;
467
468 pci_set_drvdata(dev, smbus);
469 return 0;
470
471 out_release_region:
472 release_region(smbus->base, smbus->size);
473 out_kfree:
474 kfree(smbus);
475 return error;
476 }
477
478 static void __devexit amd8111_remove(struct pci_dev *dev)
479 {
480 struct amd_smbus *smbus = pci_get_drvdata(dev);
481
482 i2c_del_adapter(&smbus->adapter);
483 release_region(smbus->base, smbus->size);
484 kfree(smbus);
485 }
486
487 static struct pci_driver amd8111_driver = {
488 .name = "amd8111_smbus2",
489 .id_table = amd8111_ids,
490 .probe = amd8111_probe,
491 .remove = __devexit_p(amd8111_remove),
492 };
493
494 static int __init i2c_amd8111_init(void)
495 {
496 return pci_register_driver(&amd8111_driver);
497 }
498
499 static void __exit i2c_amd8111_exit(void)
500 {
501 pci_unregister_driver(&amd8111_driver);
502 }
503
504 module_init(i2c_amd8111_init);
505 module_exit(i2c_amd8111_exit);
Mirror of the linux-mips.org kernel tree