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