1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45#include <linux/module.h>
46#include <linux/delay.h>
47#include <linux/pci.h>
48#include <linux/kernel.h>
49#include <linux/stddef.h>
50#include <linux/ioport.h>
51#include <linux/i2c.h>
52#include <linux/init.h>
53#include <linux/acpi.h>
54#include <asm/io.h>
55
56static struct pci_dev *vt596_pdev;
57
58#define SMBBA1 0x90
59#define SMBBA2 0x80
60#define SMBBA3 0xD0
61
62
63static unsigned short vt596_smba;
64#define SMBHSTSTS (vt596_smba + 0)
65#define SMBHSTCNT (vt596_smba + 2)
66#define SMBHSTCMD (vt596_smba + 3)
67#define SMBHSTADD (vt596_smba + 4)
68#define SMBHSTDAT0 (vt596_smba + 5)
69#define SMBHSTDAT1 (vt596_smba + 6)
70#define SMBBLKDAT (vt596_smba + 7)
71
72
73
74
75
76
77static unsigned short SMBHSTCFG = 0xD2;
78
79
80#define MAX_TIMEOUT 500
81
82
83#define VT596_QUICK 0x00
84#define VT596_BYTE 0x04
85#define VT596_BYTE_DATA 0x08
86#define VT596_WORD_DATA 0x0C
87#define VT596_PROC_CALL 0x10
88#define VT596_BLOCK_DATA 0x14
89#define VT596_I2C_BLOCK_DATA 0x34
90
91
92
93
94static int force;
95module_param(force, bool, 0);
96MODULE_PARM_DESC(force, "Forcibly enable the SMBus. DANGEROUS!");
97
98
99
100static u16 force_addr;
101module_param(force_addr, ushort, 0);
102MODULE_PARM_DESC(force_addr,
103 "Forcibly enable the SMBus at the given address. "
104 "EXTREMELY DANGEROUS!");
105
106
107static struct pci_driver vt596_driver;
108static struct i2c_adapter vt596_adapter;
109
110#define FEATURE_I2CBLOCK (1<<0)
111static unsigned int vt596_features;
112
113#ifdef DEBUG
114static void vt596_dump_regs(const char *msg, u8 size)
115{
116 dev_dbg(&vt596_adapter.dev, "%s: STS=%02x CNT=%02x CMD=%02x ADD=%02x "
117 "DAT=%02x,%02x\n", msg, inb_p(SMBHSTSTS), inb_p(SMBHSTCNT),
118 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
119 inb_p(SMBHSTDAT1));
120
121 if (size == VT596_BLOCK_DATA
122 || size == VT596_I2C_BLOCK_DATA) {
123 int i;
124
125 dev_dbg(&vt596_adapter.dev, "BLK=");
126 for (i = 0; i < I2C_SMBUS_BLOCK_MAX / 2; i++)
127 printk("%02x,", inb_p(SMBBLKDAT));
128 printk("\n");
129 dev_dbg(&vt596_adapter.dev, " ");
130 for (; i < I2C_SMBUS_BLOCK_MAX - 1; i++)
131 printk("%02x,", inb_p(SMBBLKDAT));
132 printk("%02x\n", inb_p(SMBBLKDAT));
133 }
134}
135#else
136static inline void vt596_dump_regs(const char *msg, u8 size) { }
137#endif
138
139
140static int vt596_transaction(u8 size)
141{
142 int temp;
143 int result = 0;
144 int timeout = 0;
145
146 vt596_dump_regs("Transaction (pre)", size);
147
148
149 if ((temp = inb_p(SMBHSTSTS)) & 0x1F) {
150 dev_dbg(&vt596_adapter.dev, "SMBus busy (0x%02x). "
151 "Resetting...\n", temp);
152
153 outb_p(temp, SMBHSTSTS);
154 if ((temp = inb_p(SMBHSTSTS)) & 0x1F) {
155 dev_err(&vt596_adapter.dev, "SMBus reset failed! "
156 "(0x%02x)\n", temp);
157 return -EBUSY;
158 }
159 }
160
161
162 outb_p(0x40 | size, SMBHSTCNT);
163
164
165 do {
166 msleep(1);
167 temp = inb_p(SMBHSTSTS);
168 } while ((temp & 0x01) && (timeout++ < MAX_TIMEOUT));
169
170
171 if (timeout >= MAX_TIMEOUT) {
172 result = -ETIMEDOUT;
173 dev_err(&vt596_adapter.dev, "SMBus timeout!\n");
174 }
175
176 if (temp & 0x10) {
177 result = -EIO;
178 dev_err(&vt596_adapter.dev, "Transaction failed (0x%02x)\n",
179 size);
180 }
181
182 if (temp & 0x08) {
183 result = -EIO;
184 dev_err(&vt596_adapter.dev, "SMBus collision!\n");
185 }
186
187 if (temp & 0x04) {
188 int read = inb_p(SMBHSTADD) & 0x01;
189 result = -ENXIO;
190
191
192
193 if (!((size == VT596_QUICK && !read) ||
194 (size == VT596_BYTE && read)))
195 dev_err(&vt596_adapter.dev, "Transaction error!\n");
196 }
197
198
199 if (temp & 0x1F)
200 outb_p(temp, SMBHSTSTS);
201
202 vt596_dump_regs("Transaction (post)", size);
203
204 return result;
205}
206
207
208static s32 vt596_access(struct i2c_adapter *adap, u16 addr,
209 unsigned short flags, char read_write, u8 command,
210 int size, union i2c_smbus_data *data)
211{
212 int i;
213 int status;
214
215 switch (size) {
216 case I2C_SMBUS_QUICK:
217 size = VT596_QUICK;
218 break;
219 case I2C_SMBUS_BYTE:
220 if (read_write == I2C_SMBUS_WRITE)
221 outb_p(command, SMBHSTCMD);
222 size = VT596_BYTE;
223 break;
224 case I2C_SMBUS_BYTE_DATA:
225 outb_p(command, SMBHSTCMD);
226 if (read_write == I2C_SMBUS_WRITE)
227 outb_p(data->byte, SMBHSTDAT0);
228 size = VT596_BYTE_DATA;
229 break;
230 case I2C_SMBUS_WORD_DATA:
231 outb_p(command, SMBHSTCMD);
232 if (read_write == I2C_SMBUS_WRITE) {
233 outb_p(data->word & 0xff, SMBHSTDAT0);
234 outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
235 }
236 size = VT596_WORD_DATA;
237 break;
238 case I2C_SMBUS_PROC_CALL:
239 outb_p(command, SMBHSTCMD);
240 outb_p(data->word & 0xff, SMBHSTDAT0);
241 outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
242 size = VT596_PROC_CALL;
243 break;
244 case I2C_SMBUS_I2C_BLOCK_DATA:
245 if (!(vt596_features & FEATURE_I2CBLOCK))
246 goto exit_unsupported;
247 if (read_write == I2C_SMBUS_READ)
248 outb_p(data->block[0], SMBHSTDAT0);
249
250 case I2C_SMBUS_BLOCK_DATA:
251 outb_p(command, SMBHSTCMD);
252 if (read_write == I2C_SMBUS_WRITE) {
253 u8 len = data->block[0];
254 if (len > I2C_SMBUS_BLOCK_MAX)
255 len = I2C_SMBUS_BLOCK_MAX;
256 outb_p(len, SMBHSTDAT0);
257 inb_p(SMBHSTCNT);
258 for (i = 1; i <= len; i++)
259 outb_p(data->block[i], SMBBLKDAT);
260 }
261 size = (size == I2C_SMBUS_I2C_BLOCK_DATA) ?
262 VT596_I2C_BLOCK_DATA : VT596_BLOCK_DATA;
263 break;
264 default:
265 goto exit_unsupported;
266 }
267
268 outb_p(((addr & 0x7f) << 1) | read_write, SMBHSTADD);
269
270 status = vt596_transaction(size);
271 if (status)
272 return status;
273
274 if (size == VT596_PROC_CALL)
275 read_write = I2C_SMBUS_READ;
276
277 if ((read_write == I2C_SMBUS_WRITE) || (size == VT596_QUICK))
278 return 0;
279
280 switch (size) {
281 case VT596_BYTE:
282 case VT596_BYTE_DATA:
283 data->byte = inb_p(SMBHSTDAT0);
284 break;
285 case VT596_WORD_DATA:
286 case VT596_PROC_CALL:
287 data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
288 break;
289 case VT596_I2C_BLOCK_DATA:
290 case VT596_BLOCK_DATA:
291 data->block[0] = inb_p(SMBHSTDAT0);
292 if (data->block[0] > I2C_SMBUS_BLOCK_MAX)
293 data->block[0] = I2C_SMBUS_BLOCK_MAX;
294 inb_p(SMBHSTCNT);
295 for (i = 1; i <= data->block[0]; i++)
296 data->block[i] = inb_p(SMBBLKDAT);
297 break;
298 }
299 return 0;
300
301exit_unsupported:
302 dev_warn(&vt596_adapter.dev, "Unsupported transaction %d\n",
303 size);
304 return -EOPNOTSUPP;
305}
306
307static u32 vt596_func(struct i2c_adapter *adapter)
308{
309 u32 func = I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
310 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
311 I2C_SMBUS_PROC_CALL | I2C_FUNC_SMBUS_BLOCK_DATA;
312
313 if (vt596_features & FEATURE_I2CBLOCK)
314 func |= I2C_FUNC_SMBUS_I2C_BLOCK;
315 return func;
316}
317
318static const struct i2c_algorithm smbus_algorithm = {
319 .smbus_xfer = vt596_access,
320 .functionality = vt596_func,
321};
322
323static struct i2c_adapter vt596_adapter = {
324 .owner = THIS_MODULE,
325 .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
326 .algo = &smbus_algorithm,
327};
328
329static int __devinit vt596_probe(struct pci_dev *pdev,
330 const struct pci_device_id *id)
331{
332 unsigned char temp;
333 int error = -ENODEV;
334
335
336 if (force_addr) {
337 vt596_smba = force_addr & 0xfff0;
338 force = 0;
339 goto found;
340 }
341
342 if ((pci_read_config_word(pdev, id->driver_data, &vt596_smba)) ||
343 !(vt596_smba & 0x0001)) {
344
345 if (id->device == PCI_DEVICE_ID_VIA_82C596_3 &&
346 !pci_read_config_word(pdev, SMBBA2, &vt596_smba) &&
347 (vt596_smba & 0x0001)) {
348 SMBHSTCFG = 0x84;
349 } else {
350
351 dev_err(&pdev->dev, "Cannot configure "
352 "SMBus I/O Base address\n");
353 return -ENODEV;
354 }
355 }
356
357 vt596_smba &= 0xfff0;
358 if (vt596_smba == 0) {
359 dev_err(&pdev->dev, "SMBus base address "
360 "uninitialized - upgrade BIOS or use "
361 "force_addr=0xaddr\n");
362 return -ENODEV;
363 }
364
365found:
366 error = acpi_check_region(vt596_smba, 8, vt596_driver.name);
367 if (error)
368 return -ENODEV;
369
370 if (!request_region(vt596_smba, 8, vt596_driver.name)) {
371 dev_err(&pdev->dev, "SMBus region 0x%x already in use!\n",
372 vt596_smba);
373 return -ENODEV;
374 }
375
376 pci_read_config_byte(pdev, SMBHSTCFG, &temp);
377
378
379 if (force_addr) {
380 pci_write_config_byte(pdev, SMBHSTCFG, temp & 0xfe);
381 pci_write_config_word(pdev, id->driver_data, vt596_smba);
382 pci_write_config_byte(pdev, SMBHSTCFG, temp | 0x01);
383 dev_warn(&pdev->dev, "WARNING: SMBus interface set to new "
384 "address 0x%04x!\n", vt596_smba);
385 } else if (!(temp & 0x01)) {
386 if (force) {
387
388
389
390
391
392
393 pci_write_config_byte(pdev, SMBHSTCFG, temp | 0x01);
394 dev_info(&pdev->dev, "Enabling SMBus device\n");
395 } else {
396 dev_err(&pdev->dev, "SMBUS: Error: Host SMBus "
397 "controller not enabled! - upgrade BIOS or "
398 "use force=1\n");
399 goto release_region;
400 }
401 }
402
403 dev_dbg(&pdev->dev, "VT596_smba = 0x%X\n", vt596_smba);
404
405 switch (pdev->device) {
406 case PCI_DEVICE_ID_VIA_CX700:
407 case PCI_DEVICE_ID_VIA_VX800:
408 case PCI_DEVICE_ID_VIA_VX855:
409 case PCI_DEVICE_ID_VIA_8251:
410 case PCI_DEVICE_ID_VIA_8237:
411 case PCI_DEVICE_ID_VIA_8237A:
412 case PCI_DEVICE_ID_VIA_8237S:
413 case PCI_DEVICE_ID_VIA_8235:
414 case PCI_DEVICE_ID_VIA_8233A:
415 case PCI_DEVICE_ID_VIA_8233_0:
416 vt596_features |= FEATURE_I2CBLOCK;
417 break;
418 case PCI_DEVICE_ID_VIA_82C686_4:
419
420
421 if (pdev->revision >= 0x40)
422 vt596_features |= FEATURE_I2CBLOCK;
423 break;
424 }
425
426 vt596_adapter.dev.parent = &pdev->dev;
427 snprintf(vt596_adapter.name, sizeof(vt596_adapter.name),
428 "SMBus Via Pro adapter at %04x", vt596_smba);
429
430 vt596_pdev = pci_dev_get(pdev);
431 if (i2c_add_adapter(&vt596_adapter)) {
432 pci_dev_put(vt596_pdev);
433 vt596_pdev = NULL;
434 }
435
436
437
438
439
440 return -ENODEV;
441
442release_region:
443 release_region(vt596_smba, 8);
444 return error;
445}
446
447static struct pci_device_id vt596_ids[] = {
448 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C596_3),
449 .driver_data = SMBBA1 },
450 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C596B_3),
451 .driver_data = SMBBA1 },
452 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4),
453 .driver_data = SMBBA1 },
454 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8233_0),
455 .driver_data = SMBBA3 },
456 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8233A),
457 .driver_data = SMBBA3 },
458 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235),
459 .driver_data = SMBBA3 },
460 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237),
461 .driver_data = SMBBA3 },
462 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237A),
463 .driver_data = SMBBA3 },
464 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237S),
465 .driver_data = SMBBA3 },
466 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231_4),
467 .driver_data = SMBBA1 },
468 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8251),
469 .driver_data = SMBBA3 },
470 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_CX700),
471 .driver_data = SMBBA3 },
472 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX800),
473 .driver_data = SMBBA3 },
474 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX855),
475 .driver_data = SMBBA3 },
476 { 0, }
477};
478
479MODULE_DEVICE_TABLE(pci, vt596_ids);
480
481static struct pci_driver vt596_driver = {
482 .name = "vt596_smbus",
483 .id_table = vt596_ids,
484 .probe = vt596_probe,
485};
486
487static int __init i2c_vt596_init(void)
488{
489 return pci_register_driver(&vt596_driver);
490}
491
492
493static void __exit i2c_vt596_exit(void)
494{
495 pci_unregister_driver(&vt596_driver);
496 if (vt596_pdev != NULL) {
497 i2c_del_adapter(&vt596_adapter);
498 release_region(vt596_smba, 8);
499 pci_dev_put(vt596_pdev);
500 vt596_pdev = NULL;
501 }
502}
503
504MODULE_AUTHOR("Kyosti Malkki <kmalkki@cc.hut.fi>, "
505 "Mark D. Studebaker <mdsxyz123@yahoo.com> and "
506 "Jean Delvare <khali@linux-fr.org>");
507MODULE_DESCRIPTION("vt82c596 SMBus driver");
508MODULE_LICENSE("GPL");
509
510module_init(i2c_vt596_init);
511module_exit(i2c_vt596_exit);
512
