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19#include <linux/module.h>
20#include <linux/delay.h>
21#include <linux/i2c.h>
22#include <linux/pci.h>
23#include <linux/init.h>
24#include <linux/acpi.h>
25
26#define ALI1563_MAX_TIMEOUT 500
27#define ALI1563_SMBBA 0x80
28#define ALI1563_SMB_IOEN 1
29#define ALI1563_SMB_HOSTEN 2
30#define ALI1563_SMB_IOSIZE 16
31
32#define SMB_HST_STS (ali1563_smba + 0)
33#define SMB_HST_CNTL1 (ali1563_smba + 1)
34#define SMB_HST_CNTL2 (ali1563_smba + 2)
35#define SMB_HST_CMD (ali1563_smba + 3)
36#define SMB_HST_ADD (ali1563_smba + 4)
37#define SMB_HST_DAT0 (ali1563_smba + 5)
38#define SMB_HST_DAT1 (ali1563_smba + 6)
39#define SMB_BLK_DAT (ali1563_smba + 7)
40
41#define HST_STS_BUSY 0x01
42#define HST_STS_INTR 0x02
43#define HST_STS_DEVERR 0x04
44#define HST_STS_BUSERR 0x08
45#define HST_STS_FAIL 0x10
46#define HST_STS_DONE 0x80
47#define HST_STS_BAD 0x1c
48
49
50#define HST_CNTL1_TIMEOUT 0x80
51#define HST_CNTL1_LAST 0x40
52
53#define HST_CNTL2_KILL 0x04
54#define HST_CNTL2_START 0x40
55#define HST_CNTL2_QUICK 0x00
56#define HST_CNTL2_BYTE 0x01
57#define HST_CNTL2_BYTE_DATA 0x02
58#define HST_CNTL2_WORD_DATA 0x03
59#define HST_CNTL2_BLOCK 0x05
60
61
62#define HST_CNTL2_SIZEMASK 0x38
63
64static struct pci_driver ali1563_pci_driver;
65static unsigned short ali1563_smba;
66
67static int ali1563_transaction(struct i2c_adapter * a, int size)
68{
69 u32 data;
70 int timeout;
71 int status = -EIO;
72
73 dev_dbg(&a->dev, "Transaction (pre): STS=%02x, CNTL1=%02x, "
74 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
75 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
76 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
77 inb_p(SMB_HST_DAT1));
78
79 data = inb_p(SMB_HST_STS);
80 if (data & HST_STS_BAD) {
81 dev_err(&a->dev, "ali1563: Trying to reset busy device\n");
82 outb_p(data | HST_STS_BAD,SMB_HST_STS);
83 data = inb_p(SMB_HST_STS);
84 if (data & HST_STS_BAD)
85 return -EBUSY;
86 }
87 outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2);
88
89 timeout = ALI1563_MAX_TIMEOUT;
90 do {
91 msleep(1);
92 } while (((data = inb_p(SMB_HST_STS)) & HST_STS_BUSY) && --timeout);
93
94 dev_dbg(&a->dev, "Transaction (post): STS=%02x, CNTL1=%02x, "
95 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
96 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
97 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
98 inb_p(SMB_HST_DAT1));
99
100 if (timeout && !(data & HST_STS_BAD))
101 return 0;
102
103 if (!timeout) {
104 dev_err(&a->dev, "Timeout - Trying to KILL transaction!\n");
105
106 outb_p(HST_CNTL2_KILL,SMB_HST_CNTL2);
107 data = inb_p(SMB_HST_STS);
108 status = -ETIMEDOUT;
109 }
110
111
112 if (data & HST_STS_DEVERR) {
113 if (size != HST_CNTL2_QUICK)
114 dev_err(&a->dev, "Device error!\n");
115 status = -ENXIO;
116 }
117
118 if (data & HST_STS_BUSERR) {
119 dev_err(&a->dev, "Bus collision!\n");
120
121 outb_p(HST_CNTL1_TIMEOUT,SMB_HST_CNTL1);
122 }
123
124 if (data & HST_STS_FAIL) {
125 dev_err(&a->dev, "Cleaning fail after KILL!\n");
126 outb_p(0x0,SMB_HST_CNTL2);
127 }
128
129 return status;
130}
131
132static int ali1563_block_start(struct i2c_adapter * a)
133{
134 u32 data;
135 int timeout;
136 int status = -EIO;
137
138 dev_dbg(&a->dev, "Block (pre): STS=%02x, CNTL1=%02x, "
139 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
140 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
141 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
142 inb_p(SMB_HST_DAT1));
143
144 data = inb_p(SMB_HST_STS);
145 if (data & HST_STS_BAD) {
146 dev_warn(&a->dev,"ali1563: Trying to reset busy device\n");
147 outb_p(data | HST_STS_BAD,SMB_HST_STS);
148 data = inb_p(SMB_HST_STS);
149 if (data & HST_STS_BAD)
150 return -EBUSY;
151 }
152
153
154 outb_p(data | HST_STS_DONE, SMB_HST_STS);
155
156
157 outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2);
158
159 timeout = ALI1563_MAX_TIMEOUT;
160 do {
161 msleep(1);
162 } while (!((data = inb_p(SMB_HST_STS)) & HST_STS_DONE) && --timeout);
163
164 dev_dbg(&a->dev, "Block (post): STS=%02x, CNTL1=%02x, "
165 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
166 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
167 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
168 inb_p(SMB_HST_DAT1));
169
170 if (timeout && !(data & HST_STS_BAD))
171 return 0;
172
173 if (timeout == 0)
174 status = -ETIMEDOUT;
175
176 if (data & HST_STS_DEVERR)
177 status = -ENXIO;
178
179 dev_err(&a->dev, "SMBus Error: %s%s%s%s%s\n",
180 timeout ? "" : "Timeout ",
181 data & HST_STS_FAIL ? "Transaction Failed " : "",
182 data & HST_STS_BUSERR ? "No response or Bus Collision " : "",
183 data & HST_STS_DEVERR ? "Device Error " : "",
184 !(data & HST_STS_DONE) ? "Transaction Never Finished " : "");
185 return status;
186}
187
188static int ali1563_block(struct i2c_adapter * a, union i2c_smbus_data * data, u8 rw)
189{
190 int i, len;
191 int error = 0;
192
193
194 outb_p(HST_CNTL1_LAST,SMB_HST_CNTL1);
195
196 if (rw == I2C_SMBUS_WRITE) {
197 len = data->block[0];
198 if (len < 1)
199 len = 1;
200 else if (len > 32)
201 len = 32;
202 outb_p(len,SMB_HST_DAT0);
203 outb_p(data->block[1],SMB_BLK_DAT);
204 } else
205 len = 32;
206
207 outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_BLOCK, SMB_HST_CNTL2);
208
209 for (i = 0; i < len; i++) {
210 if (rw == I2C_SMBUS_WRITE) {
211 outb_p(data->block[i + 1], SMB_BLK_DAT);
212 if ((error = ali1563_block_start(a)))
213 break;
214 } else {
215 if ((error = ali1563_block_start(a)))
216 break;
217 if (i == 0) {
218 len = inb_p(SMB_HST_DAT0);
219 if (len < 1)
220 len = 1;
221 else if (len > 32)
222 len = 32;
223 }
224 data->block[i+1] = inb_p(SMB_BLK_DAT);
225 }
226 }
227
228 outb_p(HST_CNTL1_LAST,SMB_HST_CNTL1);
229 return error;
230}
231
232static s32 ali1563_access(struct i2c_adapter * a, u16 addr,
233 unsigned short flags, char rw, u8 cmd,
234 int size, union i2c_smbus_data * data)
235{
236 int error = 0;
237 int timeout;
238 u32 reg;
239
240 for (timeout = ALI1563_MAX_TIMEOUT; timeout; timeout--) {
241 if (!(reg = inb_p(SMB_HST_STS) & HST_STS_BUSY))
242 break;
243 }
244 if (!timeout)
245 dev_warn(&a->dev,"SMBus not idle. HST_STS = %02x\n",reg);
246 outb_p(0xff,SMB_HST_STS);
247
248
249 switch (size) {
250 case I2C_SMBUS_QUICK:
251 size = HST_CNTL2_QUICK;
252 break;
253 case I2C_SMBUS_BYTE:
254 size = HST_CNTL2_BYTE;
255 break;
256 case I2C_SMBUS_BYTE_DATA:
257 size = HST_CNTL2_BYTE_DATA;
258 break;
259 case I2C_SMBUS_WORD_DATA:
260 size = HST_CNTL2_WORD_DATA;
261 break;
262 case I2C_SMBUS_BLOCK_DATA:
263 size = HST_CNTL2_BLOCK;
264 break;
265 default:
266 dev_warn(&a->dev, "Unsupported transaction %d\n", size);
267 error = -EOPNOTSUPP;
268 goto Done;
269 }
270
271 outb_p(((addr & 0x7f) << 1) | (rw & 0x01), SMB_HST_ADD);
272 outb_p((inb_p(SMB_HST_CNTL2) & ~HST_CNTL2_SIZEMASK) | (size << 3), SMB_HST_CNTL2);
273
274
275
276 switch(size) {
277 case HST_CNTL2_BYTE:
278 if (rw== I2C_SMBUS_WRITE)
279
280 outb_p(cmd, SMB_HST_DAT0);
281 break;
282 case HST_CNTL2_BYTE_DATA:
283 outb_p(cmd, SMB_HST_CMD);
284 if (rw == I2C_SMBUS_WRITE)
285 outb_p(data->byte, SMB_HST_DAT0);
286 break;
287 case HST_CNTL2_WORD_DATA:
288 outb_p(cmd, SMB_HST_CMD);
289 if (rw == I2C_SMBUS_WRITE) {
290 outb_p(data->word & 0xff, SMB_HST_DAT0);
291 outb_p((data->word & 0xff00) >> 8, SMB_HST_DAT1);
292 }
293 break;
294 case HST_CNTL2_BLOCK:
295 outb_p(cmd, SMB_HST_CMD);
296 error = ali1563_block(a,data,rw);
297 goto Done;
298 }
299
300 if ((error = ali1563_transaction(a, size)))
301 goto Done;
302
303 if ((rw == I2C_SMBUS_WRITE) || (size == HST_CNTL2_QUICK))
304 goto Done;
305
306 switch (size) {
307 case HST_CNTL2_BYTE:
308 data->byte = inb_p(SMB_HST_DAT0);
309 break;
310 case HST_CNTL2_BYTE_DATA:
311 data->byte = inb_p(SMB_HST_DAT0);
312 break;
313 case HST_CNTL2_WORD_DATA:
314 data->word = inb_p(SMB_HST_DAT0) + (inb_p(SMB_HST_DAT1) << 8);
315 break;
316 }
317Done:
318 return error;
319}
320
321static u32 ali1563_func(struct i2c_adapter * a)
322{
323 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
324 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
325 I2C_FUNC_SMBUS_BLOCK_DATA;
326}
327
328
329static int ali1563_setup(struct pci_dev *dev)
330{
331 u16 ctrl;
332
333 pci_read_config_word(dev,ALI1563_SMBBA,&ctrl);
334
335
336
337 ali1563_smba = ctrl & ~(ALI1563_SMB_IOSIZE - 1);
338 if (!ali1563_smba) {
339 dev_warn(&dev->dev,"ali1563_smba Uninitialized\n");
340 goto Err;
341 }
342
343
344 if (!(ctrl & ALI1563_SMB_HOSTEN)) {
345 dev_warn(&dev->dev, "Host Controller not enabled\n");
346 goto Err;
347 }
348 if (!(ctrl & ALI1563_SMB_IOEN)) {
349 dev_warn(&dev->dev, "I/O space not enabled, trying manually\n");
350 pci_write_config_word(dev, ALI1563_SMBBA,
351 ctrl | ALI1563_SMB_IOEN);
352 pci_read_config_word(dev, ALI1563_SMBBA, &ctrl);
353 if (!(ctrl & ALI1563_SMB_IOEN)) {
354 dev_err(&dev->dev, "I/O space still not enabled, "
355 "giving up\n");
356 goto Err;
357 }
358 }
359
360 if (acpi_check_region(ali1563_smba, ALI1563_SMB_IOSIZE,
361 ali1563_pci_driver.name))
362 goto Err;
363
364 if (!request_region(ali1563_smba, ALI1563_SMB_IOSIZE,
365 ali1563_pci_driver.name)) {
366 dev_err(&dev->dev, "Could not allocate I/O space at 0x%04x\n",
367 ali1563_smba);
368 goto Err;
369 }
370 dev_info(&dev->dev, "Found ALi1563 SMBus at 0x%04x\n", ali1563_smba);
371
372 return 0;
373Err:
374 return -ENODEV;
375}
376
377static void ali1563_shutdown(struct pci_dev *dev)
378{
379 release_region(ali1563_smba,ALI1563_SMB_IOSIZE);
380}
381
382static const struct i2c_algorithm ali1563_algorithm = {
383 .smbus_xfer = ali1563_access,
384 .functionality = ali1563_func,
385};
386
387static struct i2c_adapter ali1563_adapter = {
388 .owner = THIS_MODULE,
389 .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
390 .algo = &ali1563_algorithm,
391};
392
393static int ali1563_probe(struct pci_dev *dev,
394 const struct pci_device_id *id_table)
395{
396 int error;
397
398 if ((error = ali1563_setup(dev)))
399 goto exit;
400 ali1563_adapter.dev.parent = &dev->dev;
401 snprintf(ali1563_adapter.name, sizeof(ali1563_adapter.name),
402 "SMBus ALi 1563 Adapter @ %04x", ali1563_smba);
403 if ((error = i2c_add_adapter(&ali1563_adapter)))
404 goto exit_shutdown;
405 return 0;
406
407exit_shutdown:
408 ali1563_shutdown(dev);
409exit:
410 dev_warn(&dev->dev, "ALi1563 SMBus probe failed (%d)\n", error);
411 return error;
412}
413
414static void ali1563_remove(struct pci_dev *dev)
415{
416 i2c_del_adapter(&ali1563_adapter);
417 ali1563_shutdown(dev);
418}
419
420static DEFINE_PCI_DEVICE_TABLE(ali1563_id_table) = {
421 { PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1563) },
422 {},
423};
424
425MODULE_DEVICE_TABLE (pci, ali1563_id_table);
426
427static struct pci_driver ali1563_pci_driver = {
428 .name = "ali1563_smbus",
429 .id_table = ali1563_id_table,
430 .probe = ali1563_probe,
431 .remove = ali1563_remove,
432};
433
434module_pci_driver(ali1563_pci_driver);
435
436MODULE_LICENSE("GPL");
437
