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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
22MODULE_LICENSE("GPL");
23MODULE_AUTHOR ("Vojtech Pavlik <vojtech@suse.cz>");
24MODULE_DESCRIPTION("AMD8111 SMBus 2.0 driver");
25
26struct amd_smbus {
27 struct pci_dev *dev;
28 struct i2c_adapter adapter;
29 int base;
30 int size;
31};
32
33static struct pci_driver amd8111_driver;
34
35
36
37
38
39#define AMD_PCI_MISC 0x48
40
41#define AMD_PCI_MISC_SCI 0x04
42#define AMD_PCI_MISC_INT 0x02
43#define AMD_PCI_MISC_SPEEDUP 0x01
44
45
46
47
48
49#define AMD_EC_DATA 0x00
50#define AMD_EC_SC 0x04
51#define AMD_EC_CMD 0x04
52#define AMD_EC_ICR 0x08
53
54#define AMD_EC_SC_SMI 0x04
55#define AMD_EC_SC_SCI 0x02
56#define AMD_EC_SC_BURST 0x01
57#define AMD_EC_SC_CMD 0x08
58#define AMD_EC_SC_IBF 0x02
59#define AMD_EC_SC_OBF 0x01
60
61#define AMD_EC_CMD_RD 0x80
62#define AMD_EC_CMD_WR 0x81
63#define AMD_EC_CMD_BE 0x82
64#define AMD_EC_CMD_BD 0x83
65#define AMD_EC_CMD_QR 0x84
66
67
68
69
70
71static 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
87static 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
103static 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
126static 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
151
152
153#define AMD_SMB_PRTCL 0x00
154#define AMD_SMB_STS 0x01
155#define AMD_SMB_ADDR 0x02
156#define AMD_SMB_CMD 0x03
157#define AMD_SMB_DATA 0x04
158#define AMD_SMB_BCNT 0x24
159#define AMD_SMB_ALRM_A 0x25
160#define AMD_SMB_ALRM_D 0x26
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
192static 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 case I2C_SMBUS_I2C_BLOCK_DATA:
388 for (i = 0; i < len; i++) {
389 status = amd_ec_read(smbus, AMD_SMB_DATA + i,
390 data->block + i + 1);
391 if (status)
392 return status;
393 }
394 data->block[0] = len;
395 break;
396 }
397
398 return 0;
399}
400
401
402static u32 amd8111_func(struct i2c_adapter *adapter)
403{
404 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
405 I2C_FUNC_SMBUS_BYTE_DATA |
406 I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_BLOCK_DATA |
407 I2C_FUNC_SMBUS_PROC_CALL | I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
408 I2C_FUNC_SMBUS_I2C_BLOCK | I2C_FUNC_SMBUS_PEC;
409}
410
411static const struct i2c_algorithm smbus_algorithm = {
412 .smbus_xfer = amd8111_access,
413 .functionality = amd8111_func,
414};
415
416
417static const struct pci_device_id amd8111_ids[] = {
418 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS2) },
419 { 0, }
420};
421
422MODULE_DEVICE_TABLE (pci, amd8111_ids);
423
424static int amd8111_probe(struct pci_dev *dev, const struct pci_device_id *id)
425{
426 struct amd_smbus *smbus;
427 int error;
428
429 if (!(pci_resource_flags(dev, 0) & IORESOURCE_IO))
430 return -ENODEV;
431
432 smbus = kzalloc(sizeof(struct amd_smbus), GFP_KERNEL);
433 if (!smbus)
434 return -ENOMEM;
435
436 smbus->dev = dev;
437 smbus->base = pci_resource_start(dev, 0);
438 smbus->size = pci_resource_len(dev, 0);
439
440 error = acpi_check_resource_conflict(&dev->resource[0]);
441 if (error) {
442 error = -ENODEV;
443 goto out_kfree;
444 }
445
446 if (!request_region(smbus->base, smbus->size, amd8111_driver.name)) {
447 error = -EBUSY;
448 goto out_kfree;
449 }
450
451 smbus->adapter.owner = THIS_MODULE;
452 snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),
453 "SMBus2 AMD8111 adapter at %04x", smbus->base);
454 smbus->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
455 smbus->adapter.algo = &smbus_algorithm;
456 smbus->adapter.algo_data = smbus;
457
458
459 smbus->adapter.dev.parent = &dev->dev;
460
461 pci_write_config_dword(smbus->dev, AMD_PCI_MISC, 0);
462 error = i2c_add_adapter(&smbus->adapter);
463 if (error)
464 goto out_release_region;
465
466 pci_set_drvdata(dev, smbus);
467 return 0;
468
469 out_release_region:
470 release_region(smbus->base, smbus->size);
471 out_kfree:
472 kfree(smbus);
473 return error;
474}
475
476static void amd8111_remove(struct pci_dev *dev)
477{
478 struct amd_smbus *smbus = pci_get_drvdata(dev);
479
480 i2c_del_adapter(&smbus->adapter);
481 release_region(smbus->base, smbus->size);
482 kfree(smbus);
483}
484
485static struct pci_driver amd8111_driver = {
486 .name = "amd8111_smbus2",
487 .id_table = amd8111_ids,
488 .probe = amd8111_probe,
489 .remove = amd8111_remove,
490};
491
492module_pci_driver(amd8111_driver);
493
