?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 2.6.26-rc5
[linux-2.6/openmoko-kernel/knife-kernel.git] / drivers / i2c / busses / i2c-amd8111.c
blob5d1a27ef250450bc76457c8f34b48484beba5e54
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 <asm/io.h>
20
21 MODULE_LICENSE("GPL");
22 MODULE_AUTHOR ("Vojtech Pavlik <vojtech@suse.cz>");
23 MODULE_DESCRIPTION("AMD8111 SMBus 2.0 driver");
24
25 struct amd_smbus {
26 struct pci_dev *dev;
27 struct i2c_adapter adapter;
28 int base;
29 int size;
30 };
31
32 static struct pci_driver amd8111_driver;
33
34 /*
35 * AMD PCI control registers definitions.
36 */
37
38 #define AMD_PCI_MISC 0x48
39
40 #define AMD_PCI_MISC_SCI 0x04 /* deliver SCI */
41 #define AMD_PCI_MISC_INT 0x02 /* deliver PCI IRQ */
42 #define AMD_PCI_MISC_SPEEDUP 0x01 /* 16x clock speedup */
43
44 /*
45 * ACPI 2.0 chapter 13 PCI interface definitions.
46 */
47
48 #define AMD_EC_DATA 0x00 /* data register */
49 #define AMD_EC_SC 0x04 /* status of controller */
50 #define AMD_EC_CMD 0x04 /* command register */
51 #define AMD_EC_ICR 0x08 /* interrupt control register */
52
53 #define AMD_EC_SC_SMI 0x04 /* smi event pending */
54 #define AMD_EC_SC_SCI 0x02 /* sci event pending */
55 #define AMD_EC_SC_BURST 0x01 /* burst mode enabled */
56 #define AMD_EC_SC_CMD 0x08 /* byte in data reg is command */
57 #define AMD_EC_SC_IBF 0x02 /* data ready for embedded controller */
58 #define AMD_EC_SC_OBF 0x01 /* data ready for host */
59
60 #define AMD_EC_CMD_RD 0x80 /* read EC */
61 #define AMD_EC_CMD_WR 0x81 /* write EC */
62 #define AMD_EC_CMD_BE 0x82 /* enable burst mode */
63 #define AMD_EC_CMD_BD 0x83 /* disable burst mode */
64 #define AMD_EC_CMD_QR 0x84 /* query EC */
65
66 /*
67 * ACPI 2.0 chapter 13 access of registers of the EC
68 */
69
70 static unsigned int amd_ec_wait_write(struct amd_smbus *smbus)
71 {
72 int timeout = 500;
73
74 while (timeout-- && (inb(smbus->base + AMD_EC_SC) & AMD_EC_SC_IBF))
75 udelay(1);
76
77 if (!timeout) {
78 dev_warn(&smbus->dev->dev,
79 "Timeout while waiting for IBF to clear\n");
80 return -1;
81 }
82
83 return 0;
84 }
85
86 static unsigned int amd_ec_wait_read(struct amd_smbus *smbus)
87 {
88 int timeout = 500;
89
90 while (timeout-- && (~inb(smbus->base + AMD_EC_SC) & AMD_EC_SC_OBF))
91 udelay(1);
92
93 if (!timeout) {
94 dev_warn(&smbus->dev->dev,
95 "Timeout while waiting for OBF to set\n");
96 return -1;
97 }
98
99 return 0;
100 }
101
102 static unsigned int amd_ec_read(struct amd_smbus *smbus, unsigned char address,
103 unsigned char *data)
104 {
105 if (amd_ec_wait_write(smbus))
106 return -1;
107 outb(AMD_EC_CMD_RD, smbus->base + AMD_EC_CMD);
108
109 if (amd_ec_wait_write(smbus))
110 return -1;
111 outb(address, smbus->base + AMD_EC_DATA);
112
113 if (amd_ec_wait_read(smbus))
114 return -1;
115 *data = inb(smbus->base + AMD_EC_DATA);
116
117 return 0;
118 }
119
120 static unsigned int amd_ec_write(struct amd_smbus *smbus, unsigned char address,
121 unsigned char data)
122 {
123 if (amd_ec_wait_write(smbus))
124 return -1;
125 outb(AMD_EC_CMD_WR, smbus->base + AMD_EC_CMD);
126
127 if (amd_ec_wait_write(smbus))
128 return -1;
129 outb(address, smbus->base + AMD_EC_DATA);
130
131 if (amd_ec_wait_write(smbus))
132 return -1;
133 outb(data, smbus->base + AMD_EC_DATA);
134
135 return 0;
136 }
137
138 /*
139 * ACPI 2.0 chapter 13 SMBus 2.0 EC register model
140 */
141
142 #define AMD_SMB_PRTCL 0x00 /* protocol, PEC */
143 #define AMD_SMB_STS 0x01 /* status */
144 #define AMD_SMB_ADDR 0x02 /* address */
145 #define AMD_SMB_CMD 0x03 /* command */
146 #define AMD_SMB_DATA 0x04 /* 32 data registers */
147 #define AMD_SMB_BCNT 0x24 /* number of data bytes */
148 #define AMD_SMB_ALRM_A 0x25 /* alarm address */
149 #define AMD_SMB_ALRM_D 0x26 /* 2 bytes alarm data */
150
151 #define AMD_SMB_STS_DONE 0x80
152 #define AMD_SMB_STS_ALRM 0x40
153 #define AMD_SMB_STS_RES 0x20
154 #define AMD_SMB_STS_STATUS 0x1f
155
156 #define AMD_SMB_STATUS_OK 0x00
157 #define AMD_SMB_STATUS_FAIL 0x07
158 #define AMD_SMB_STATUS_DNAK 0x10
159 #define AMD_SMB_STATUS_DERR 0x11
160 #define AMD_SMB_STATUS_CMD_DENY 0x12
161 #define AMD_SMB_STATUS_UNKNOWN 0x13
162 #define AMD_SMB_STATUS_ACC_DENY 0x17
163 #define AMD_SMB_STATUS_TIMEOUT 0x18
164 #define AMD_SMB_STATUS_NOTSUP 0x19
165 #define AMD_SMB_STATUS_BUSY 0x1A
166 #define AMD_SMB_STATUS_PEC 0x1F
167
168 #define AMD_SMB_PRTCL_WRITE 0x00
169 #define AMD_SMB_PRTCL_READ 0x01
170 #define AMD_SMB_PRTCL_QUICK 0x02
171 #define AMD_SMB_PRTCL_BYTE 0x04
172 #define AMD_SMB_PRTCL_BYTE_DATA 0x06
173 #define AMD_SMB_PRTCL_WORD_DATA 0x08
174 #define AMD_SMB_PRTCL_BLOCK_DATA 0x0a
175 #define AMD_SMB_PRTCL_PROC_CALL 0x0c
176 #define AMD_SMB_PRTCL_BLOCK_PROC_CALL 0x0d
177 #define AMD_SMB_PRTCL_I2C_BLOCK_DATA 0x4a
178 #define AMD_SMB_PRTCL_PEC 0x80
179
180
181 static s32 amd8111_access(struct i2c_adapter * adap, u16 addr,
182 unsigned short flags, char read_write, u8 command, int size,
183 union i2c_smbus_data * data)
184 {
185 struct amd_smbus *smbus = adap->algo_data;
186 unsigned char protocol, len, pec, temp[2];
187 int i;
188
189 protocol = (read_write == I2C_SMBUS_READ) ? AMD_SMB_PRTCL_READ
190 : AMD_SMB_PRTCL_WRITE;
191 pec = (flags & I2C_CLIENT_PEC) ? AMD_SMB_PRTCL_PEC : 0;
192
193 switch (size) {
194 case I2C_SMBUS_QUICK:
195 protocol |= AMD_SMB_PRTCL_QUICK;
196 read_write = I2C_SMBUS_WRITE;
197 break;
198
199 case I2C_SMBUS_BYTE:
200 if (read_write == I2C_SMBUS_WRITE)
201 amd_ec_write(smbus, AMD_SMB_CMD, command);
202 protocol |= AMD_SMB_PRTCL_BYTE;
203 break;
204
205 case I2C_SMBUS_BYTE_DATA:
206 amd_ec_write(smbus, AMD_SMB_CMD, command);
207 if (read_write == I2C_SMBUS_WRITE)
208 amd_ec_write(smbus, AMD_SMB_DATA, data->byte);
209 protocol |= AMD_SMB_PRTCL_BYTE_DATA;
210 break;
211
212 case I2C_SMBUS_WORD_DATA:
213 amd_ec_write(smbus, AMD_SMB_CMD, command);
214 if (read_write == I2C_SMBUS_WRITE) {
215 amd_ec_write(smbus, AMD_SMB_DATA,
216 data->word & 0xff);
217 amd_ec_write(smbus, AMD_SMB_DATA + 1,
218 data->word >> 8);
219 }
220 protocol |= AMD_SMB_PRTCL_WORD_DATA | pec;
221 break;
222
223 case I2C_SMBUS_BLOCK_DATA:
224 amd_ec_write(smbus, AMD_SMB_CMD, command);
225 if (read_write == I2C_SMBUS_WRITE) {
226 len = min_t(u8, data->block[0],
227 I2C_SMBUS_BLOCK_MAX);
228 amd_ec_write(smbus, AMD_SMB_BCNT, len);
229 for (i = 0; i < len; i++)
230 amd_ec_write(smbus, AMD_SMB_DATA + i,
231 data->block[i + 1]);
232 }
233 protocol |= AMD_SMB_PRTCL_BLOCK_DATA | pec;
234 break;
235
236 case I2C_SMBUS_I2C_BLOCK_DATA:
237 len = min_t(u8, data->block[0],
238 I2C_SMBUS_BLOCK_MAX);
239 amd_ec_write(smbus, AMD_SMB_CMD, command);
240 amd_ec_write(smbus, AMD_SMB_BCNT, len);
241 if (read_write == I2C_SMBUS_WRITE)
242 for (i = 0; i < len; i++)
243 amd_ec_write(smbus, AMD_SMB_DATA + i,
244 data->block[i + 1]);
245 protocol |= AMD_SMB_PRTCL_I2C_BLOCK_DATA;
246 break;
247
248 case I2C_SMBUS_PROC_CALL:
249 amd_ec_write(smbus, AMD_SMB_CMD, command);
250 amd_ec_write(smbus, AMD_SMB_DATA, data->word & 0xff);
251 amd_ec_write(smbus, AMD_SMB_DATA + 1, data->word >> 8);
252 protocol = AMD_SMB_PRTCL_PROC_CALL | pec;
253 read_write = I2C_SMBUS_READ;
254 break;
255
256 case I2C_SMBUS_BLOCK_PROC_CALL:
257 len = min_t(u8, data->block[0],
258 I2C_SMBUS_BLOCK_MAX - 1);
259 amd_ec_write(smbus, AMD_SMB_CMD, command);
260 amd_ec_write(smbus, AMD_SMB_BCNT, len);
261 for (i = 0; i < len; i++)
262 amd_ec_write(smbus, AMD_SMB_DATA + i,
263 data->block[i + 1]);
264 protocol = AMD_SMB_PRTCL_BLOCK_PROC_CALL | pec;
265 read_write = I2C_SMBUS_READ;
266 break;
267
268 default:
269 dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
270 return -1;
271 }
272
273 amd_ec_write(smbus, AMD_SMB_ADDR, addr << 1);
274 amd_ec_write(smbus, AMD_SMB_PRTCL, protocol);
275
276 amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
277
278 if (~temp[0] & AMD_SMB_STS_DONE) {
279 udelay(500);
280 amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
281 }
282
283 if (~temp[0] & AMD_SMB_STS_DONE) {
284 msleep(1);
285 amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
286 }
287
288 if ((~temp[0] & AMD_SMB_STS_DONE) || (temp[0] & AMD_SMB_STS_STATUS))
289 return -1;
290
291 if (read_write == I2C_SMBUS_WRITE)
292 return 0;
293
294 switch (size) {
295 case I2C_SMBUS_BYTE:
296 case I2C_SMBUS_BYTE_DATA:
297 amd_ec_read(smbus, AMD_SMB_DATA, &data->byte);
298 break;
299
300 case I2C_SMBUS_WORD_DATA:
301 case I2C_SMBUS_PROC_CALL:
302 amd_ec_read(smbus, AMD_SMB_DATA, temp + 0);
303 amd_ec_read(smbus, AMD_SMB_DATA + 1, temp + 1);
304 data->word = (temp[1] << 8) | temp[0];
305 break;
306
307 case I2C_SMBUS_BLOCK_DATA:
308 case I2C_SMBUS_BLOCK_PROC_CALL:
309 amd_ec_read(smbus, AMD_SMB_BCNT, &len);
310 len = min_t(u8, len, I2C_SMBUS_BLOCK_MAX);
311 case I2C_SMBUS_I2C_BLOCK_DATA:
312 for (i = 0; i < len; i++)
313 amd_ec_read(smbus, AMD_SMB_DATA + i,
314 data->block + i + 1);
315 data->block[0] = len;
316 break;
317 }
318
319 return 0;
320 }
321
322
323 static u32 amd8111_func(struct i2c_adapter *adapter)
324 {
325 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
326 I2C_FUNC_SMBUS_BYTE_DATA |
327 I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_BLOCK_DATA |
328 I2C_FUNC_SMBUS_PROC_CALL | I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
329 I2C_FUNC_SMBUS_I2C_BLOCK | I2C_FUNC_SMBUS_PEC;
330 }
331
332 static const struct i2c_algorithm smbus_algorithm = {
333 .smbus_xfer = amd8111_access,
334 .functionality = amd8111_func,
335 };
336
337
338 static struct pci_device_id amd8111_ids[] = {
339 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS2) },
340 { 0, }
341 };
342
343 MODULE_DEVICE_TABLE (pci, amd8111_ids);
344
345 static int __devinit amd8111_probe(struct pci_dev *dev,
346 const struct pci_device_id *id)
347 {
348 struct amd_smbus *smbus;
349 int error;
350
351 if (!(pci_resource_flags(dev, 0) & IORESOURCE_IO))
352 return -ENODEV;
353
354 smbus = kzalloc(sizeof(struct amd_smbus), GFP_KERNEL);
355 if (!smbus)
356 return -ENOMEM;
357
358 smbus->dev = dev;
359 smbus->base = pci_resource_start(dev, 0);
360 smbus->size = pci_resource_len(dev, 0);
361
362 if (!request_region(smbus->base, smbus->size, amd8111_driver.name)) {
363 error = -EBUSY;
364 goto out_kfree;
365 }
366
367 smbus->adapter.owner = THIS_MODULE;
368 snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),
369 "SMBus2 AMD8111 adapter at %04x", smbus->base);
370 smbus->adapter.id = I2C_HW_SMBUS_AMD8111;
371 smbus->adapter.class = I2C_CLASS_HWMON;
372 smbus->adapter.algo = &smbus_algorithm;
373 smbus->adapter.algo_data = smbus;
374
375 /* set up the sysfs linkage to our parent device */
376 smbus->adapter.dev.parent = &dev->dev;
377
378 pci_write_config_dword(smbus->dev, AMD_PCI_MISC, 0);
379 error = i2c_add_adapter(&smbus->adapter);
380 if (error)
381 goto out_release_region;
382
383 pci_set_drvdata(dev, smbus);
384 return 0;
385
386 out_release_region:
387 release_region(smbus->base, smbus->size);
388 out_kfree:
389 kfree(smbus);
390 return error;
391 }
392
393 static void __devexit amd8111_remove(struct pci_dev *dev)
394 {
395 struct amd_smbus *smbus = pci_get_drvdata(dev);
396
397 i2c_del_adapter(&smbus->adapter);
398 release_region(smbus->base, smbus->size);
399 kfree(smbus);
400 }
401
402 static struct pci_driver amd8111_driver = {
403 .name = "amd8111_smbus2",
404 .id_table = amd8111_ids,
405 .probe = amd8111_probe,
406 .remove = __devexit_p(amd8111_remove),
407 };
408
409 static int __init i2c_amd8111_init(void)
410 {
411 return pci_register_driver(&amd8111_driver);
412 }
413
414 static void __exit i2c_amd8111_exit(void)
415 {
416 pci_unregister_driver(&amd8111_driver);
417 }
418
419 module_init(i2c_amd8111_init);
420 module_exit(i2c_amd8111_exit);
Community contributions to the Openmoko Kernel