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Diffstat (limited to 'drivers/i2c/busses/i2c-ali1563.c')
-rw-r--r--drivers/i2c/busses/i2c-ali1563.c415
1 files changed, 415 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-ali1563.c b/drivers/i2c/busses/i2c-ali1563.c
new file mode 100644
index 000000000000..35710818fe47
--- /dev/null
+++ b/drivers/i2c/busses/i2c-ali1563.c
@@ -0,0 +1,415 @@
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
61static unsigned short ali1563_smba;
62
63static 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
113static 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
161static 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
205static 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 }
288Done:
289 return error;
290}
291
292static 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
300static 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
309static 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;
343Err:
344 return -ENODEV;
345}
346
347static void ali1563_shutdown(struct pci_dev *dev)
348{
349 release_region(ali1563_smba,ALI1563_SMB_IOSIZE);
350}
351
352static 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
359static struct i2c_adapter ali1563_adapter = {
360 .owner = THIS_MODULE,
361 .class = I2C_CLASS_HWMON,
362 .algo = &ali1563_algorithm,
363};
364
365static 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
381static void __devexit ali1563_remove(struct pci_dev * dev)
382{
383 i2c_del_adapter(&ali1563_adapter);
384 ali1563_shutdown(dev);
385}
386
387static struct pci_device_id __devinitdata ali1563_id_table[] = {
388 { PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1563) },
389 {},
390};
391
392MODULE_DEVICE_TABLE (pci, ali1563_id_table);
393
394static 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
401static int __init ali1563_init(void)
402{
403 return pci_register_driver(&ali1563_pci_driver);
404}
405
406module_init(ali1563_init);
407
408static void __exit ali1563_exit(void)
409{
410 pci_unregister_driver(&ali1563_pci_driver);
411}
412
413module_exit(ali1563_exit);
414
415MODULE_LICENSE("GPL");
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