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41#include <linux/module.h>
42#include <linux/delay.h>
43#include <linux/pci.h>
44#include <linux/kernel.h>
45#include <linux/stddef.h>
46#include <linux/ioport.h>
47#include <linux/i2c.h>
48#include <linux/init.h>
49#include <linux/acpi.h>
50#include <linux/io.h>
51
52static struct pci_dev *vt596_pdev;
53
54#define SMBBA1 0x90
55#define SMBBA2 0x80
56#define SMBBA3 0xD0
57
58
59static unsigned short vt596_smba;
60#define SMBHSTSTS (vt596_smba + 0)
61#define SMBHSTCNT (vt596_smba + 2)
62#define SMBHSTCMD (vt596_smba + 3)
63#define SMBHSTADD (vt596_smba + 4)
64#define SMBHSTDAT0 (vt596_smba + 5)
65#define SMBHSTDAT1 (vt596_smba + 6)
66#define SMBBLKDAT (vt596_smba + 7)
67
68
69
70
71
72
73static unsigned short SMBHSTCFG = 0xD2;
74
75
76#define MAX_TIMEOUT 500
77
78
79#define VT596_QUICK 0x00
80#define VT596_BYTE 0x04
81#define VT596_BYTE_DATA 0x08
82#define VT596_WORD_DATA 0x0C
83#define VT596_PROC_CALL 0x10
84#define VT596_BLOCK_DATA 0x14
85#define VT596_I2C_BLOCK_DATA 0x34
86
87
88
89
90static bool force;
91module_param(force, bool, 0);
92MODULE_PARM_DESC(force, "Forcibly enable the SMBus. DANGEROUS!");
93
94
95
96static u16 force_addr;
97module_param(force_addr, ushort, 0);
98MODULE_PARM_DESC(force_addr,
99 "Forcibly enable the SMBus at the given address. "
100 "EXTREMELY DANGEROUS!");
101
102
103static struct pci_driver vt596_driver;
104static struct i2c_adapter vt596_adapter;
105
106#define FEATURE_I2CBLOCK (1<<0)
107static unsigned int vt596_features;
108
109#ifdef DEBUG
110static void vt596_dump_regs(const char *msg, u8 size)
111{
112 dev_dbg(&vt596_adapter.dev, "%s: STS=%02x CNT=%02x CMD=%02x ADD=%02x "
113 "DAT=%02x,%02x\n", msg, inb_p(SMBHSTSTS), inb_p(SMBHSTCNT),
114 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
115 inb_p(SMBHSTDAT1));
116
117 if (size == VT596_BLOCK_DATA
118 || size == VT596_I2C_BLOCK_DATA) {
119 int i;
120
121 dev_dbg(&vt596_adapter.dev, "BLK=");
122 for (i = 0; i < I2C_SMBUS_BLOCK_MAX / 2; i++)
123 printk("%02x,", inb_p(SMBBLKDAT));
124 printk("\n");
125 dev_dbg(&vt596_adapter.dev, " ");
126 for (; i < I2C_SMBUS_BLOCK_MAX - 1; i++)
127 printk("%02x,", inb_p(SMBBLKDAT));
128 printk("%02x\n", inb_p(SMBBLKDAT));
129 }
130}
131#else
132static inline void vt596_dump_regs(const char *msg, u8 size) { }
133#endif
134
135
136static int vt596_transaction(u8 size)
137{
138 int temp;
139 int result = 0;
140 int timeout = 0;
141
142 vt596_dump_regs("Transaction (pre)", size);
143
144
145 if ((temp = inb_p(SMBHSTSTS)) & 0x1F) {
146 dev_dbg(&vt596_adapter.dev, "SMBus busy (0x%02x). "
147 "Resetting...\n", temp);
148
149 outb_p(temp, SMBHSTSTS);
150 if ((temp = inb_p(SMBHSTSTS)) & 0x1F) {
151 dev_err(&vt596_adapter.dev, "SMBus reset failed! "
152 "(0x%02x)\n", temp);
153 return -EBUSY;
154 }
155 }
156
157
158 outb_p(0x40 | size, SMBHSTCNT);
159
160
161 do {
162 msleep(1);
163 temp = inb_p(SMBHSTSTS);
164 } while ((temp & 0x01) && (++timeout < MAX_TIMEOUT));
165
166
167 if (timeout == MAX_TIMEOUT) {
168 result = -ETIMEDOUT;
169 dev_err(&vt596_adapter.dev, "SMBus timeout!\n");
170 }
171
172 if (temp & 0x10) {
173 result = -EIO;
174 dev_err(&vt596_adapter.dev, "Transaction failed (0x%02x)\n",
175 size);
176 }
177
178 if (temp & 0x08) {
179 result = -EIO;
180 dev_err(&vt596_adapter.dev, "SMBus collision!\n");
181 }
182
183 if (temp & 0x04) {
184 result = -ENXIO;
185 dev_dbg(&vt596_adapter.dev, "No response\n");
186 }
187
188
189 if (temp & 0x1F)
190 outb_p(temp, SMBHSTSTS);
191
192 vt596_dump_regs("Transaction (post)", size);
193
194 return result;
195}
196
197
198static s32 vt596_access(struct i2c_adapter *adap, u16 addr,
199 unsigned short flags, char read_write, u8 command,
200 int size, union i2c_smbus_data *data)
201{
202 int i;
203 int status;
204
205 switch (size) {
206 case I2C_SMBUS_QUICK:
207 size = VT596_QUICK;
208 break;
209 case I2C_SMBUS_BYTE:
210 if (read_write == I2C_SMBUS_WRITE)
211 outb_p(command, SMBHSTCMD);
212 size = VT596_BYTE;
213 break;
214 case I2C_SMBUS_BYTE_DATA:
215 outb_p(command, SMBHSTCMD);
216 if (read_write == I2C_SMBUS_WRITE)
217 outb_p(data->byte, SMBHSTDAT0);
218 size = VT596_BYTE_DATA;
219 break;
220 case I2C_SMBUS_WORD_DATA:
221 outb_p(command, SMBHSTCMD);
222 if (read_write == I2C_SMBUS_WRITE) {
223 outb_p(data->word & 0xff, SMBHSTDAT0);
224 outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
225 }
226 size = VT596_WORD_DATA;
227 break;
228 case I2C_SMBUS_PROC_CALL:
229 outb_p(command, SMBHSTCMD);
230 outb_p(data->word & 0xff, SMBHSTDAT0);
231 outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
232 size = VT596_PROC_CALL;
233 break;
234 case I2C_SMBUS_I2C_BLOCK_DATA:
235 if (!(vt596_features & FEATURE_I2CBLOCK))
236 goto exit_unsupported;
237 if (read_write == I2C_SMBUS_READ)
238 outb_p(data->block[0], SMBHSTDAT0);
239
240 case I2C_SMBUS_BLOCK_DATA:
241 outb_p(command, SMBHSTCMD);
242 if (read_write == I2C_SMBUS_WRITE) {
243 u8 len = data->block[0];
244 if (len > I2C_SMBUS_BLOCK_MAX)
245 len = I2C_SMBUS_BLOCK_MAX;
246 outb_p(len, SMBHSTDAT0);
247 inb_p(SMBHSTCNT);
248 for (i = 1; i <= len; i++)
249 outb_p(data->block[i], SMBBLKDAT);
250 }
251 size = (size == I2C_SMBUS_I2C_BLOCK_DATA) ?
252 VT596_I2C_BLOCK_DATA : VT596_BLOCK_DATA;
253 break;
254 default:
255 goto exit_unsupported;
256 }
257
258 outb_p(((addr & 0x7f) << 1) | read_write, SMBHSTADD);
259
260 status = vt596_transaction(size);
261 if (status)
262 return status;
263
264 if (size == VT596_PROC_CALL)
265 read_write = I2C_SMBUS_READ;
266
267 if ((read_write == I2C_SMBUS_WRITE) || (size == VT596_QUICK))
268 return 0;
269
270 switch (size) {
271 case VT596_BYTE:
272 case VT596_BYTE_DATA:
273 data->byte = inb_p(SMBHSTDAT0);
274 break;
275 case VT596_WORD_DATA:
276 case VT596_PROC_CALL:
277 data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
278 break;
279 case VT596_I2C_BLOCK_DATA:
280 case VT596_BLOCK_DATA:
281 data->block[0] = inb_p(SMBHSTDAT0);
282 if (data->block[0] > I2C_SMBUS_BLOCK_MAX)
283 data->block[0] = I2C_SMBUS_BLOCK_MAX;
284 inb_p(SMBHSTCNT);
285 for (i = 1; i <= data->block[0]; i++)
286 data->block[i] = inb_p(SMBBLKDAT);
287 break;
288 }
289 return 0;
290
291exit_unsupported:
292 dev_warn(&vt596_adapter.dev, "Unsupported transaction %d\n",
293 size);
294 return -EOPNOTSUPP;
295}
296
297static u32 vt596_func(struct i2c_adapter *adapter)
298{
299 u32 func = I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
300 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
301 I2C_SMBUS_PROC_CALL | I2C_FUNC_SMBUS_BLOCK_DATA;
302
303 if (vt596_features & FEATURE_I2CBLOCK)
304 func |= I2C_FUNC_SMBUS_I2C_BLOCK;
305 return func;
306}
307
308static const struct i2c_algorithm smbus_algorithm = {
309 .smbus_xfer = vt596_access,
310 .functionality = vt596_func,
311};
312
313static struct i2c_adapter vt596_adapter = {
314 .owner = THIS_MODULE,
315 .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
316 .algo = &smbus_algorithm,
317};
318
319static int vt596_probe(struct pci_dev *pdev,
320 const struct pci_device_id *id)
321{
322 unsigned char temp;
323 int error;
324
325
326 if (force_addr) {
327 vt596_smba = force_addr & 0xfff0;
328 force = 0;
329 goto found;
330 }
331
332 if ((pci_read_config_word(pdev, id->driver_data, &vt596_smba)) ||
333 !(vt596_smba & 0x0001)) {
334
335 if (id->device == PCI_DEVICE_ID_VIA_82C596_3 &&
336 !pci_read_config_word(pdev, SMBBA2, &vt596_smba) &&
337 (vt596_smba & 0x0001)) {
338 SMBHSTCFG = 0x84;
339 } else {
340
341 dev_err(&pdev->dev, "Cannot configure "
342 "SMBus I/O Base address\n");
343 return -ENODEV;
344 }
345 }
346
347 vt596_smba &= 0xfff0;
348 if (vt596_smba == 0) {
349 dev_err(&pdev->dev, "SMBus base address "
350 "uninitialized - upgrade BIOS or use "
351 "force_addr=0xaddr\n");
352 return -ENODEV;
353 }
354
355found:
356 error = acpi_check_region(vt596_smba, 8, vt596_driver.name);
357 if (error)
358 return -ENODEV;
359
360 if (!request_region(vt596_smba, 8, vt596_driver.name)) {
361 dev_err(&pdev->dev, "SMBus region 0x%x already in use!\n",
362 vt596_smba);
363 return -ENODEV;
364 }
365
366 pci_read_config_byte(pdev, SMBHSTCFG, &temp);
367
368
369 if (force_addr) {
370 pci_write_config_byte(pdev, SMBHSTCFG, temp & 0xfe);
371 pci_write_config_word(pdev, id->driver_data, vt596_smba);
372 pci_write_config_byte(pdev, SMBHSTCFG, temp | 0x01);
373 dev_warn(&pdev->dev, "WARNING: SMBus interface set to new "
374 "address 0x%04x!\n", vt596_smba);
375 } else if (!(temp & 0x01)) {
376 if (force) {
377
378
379
380
381
382
383 pci_write_config_byte(pdev, SMBHSTCFG, temp | 0x01);
384 dev_info(&pdev->dev, "Enabling SMBus device\n");
385 } else {
386 dev_err(&pdev->dev, "SMBUS: Error: Host SMBus "
387 "controller not enabled! - upgrade BIOS or "
388 "use force=1\n");
389 error = -ENODEV;
390 goto release_region;
391 }
392 }
393
394 dev_dbg(&pdev->dev, "VT596_smba = 0x%X\n", vt596_smba);
395
396 switch (pdev->device) {
397 case PCI_DEVICE_ID_VIA_CX700:
398 case PCI_DEVICE_ID_VIA_VX800:
399 case PCI_DEVICE_ID_VIA_VX855:
400 case PCI_DEVICE_ID_VIA_VX900:
401 case PCI_DEVICE_ID_VIA_8251:
402 case PCI_DEVICE_ID_VIA_8237:
403 case PCI_DEVICE_ID_VIA_8237A:
404 case PCI_DEVICE_ID_VIA_8237S:
405 case PCI_DEVICE_ID_VIA_8235:
406 case PCI_DEVICE_ID_VIA_8233A:
407 case PCI_DEVICE_ID_VIA_8233_0:
408 vt596_features |= FEATURE_I2CBLOCK;
409 break;
410 case PCI_DEVICE_ID_VIA_82C686_4:
411
412
413 if (pdev->revision >= 0x40)
414 vt596_features |= FEATURE_I2CBLOCK;
415 break;
416 }
417
418 vt596_adapter.dev.parent = &pdev->dev;
419 snprintf(vt596_adapter.name, sizeof(vt596_adapter.name),
420 "SMBus Via Pro adapter at %04x", vt596_smba);
421
422 vt596_pdev = pci_dev_get(pdev);
423 error = i2c_add_adapter(&vt596_adapter);
424 if (error) {
425 pci_dev_put(vt596_pdev);
426 vt596_pdev = NULL;
427 goto release_region;
428 }
429
430
431
432
433
434 return -ENODEV;
435
436release_region:
437 release_region(vt596_smba, 8);
438 return error;
439}
440
441static const struct pci_device_id vt596_ids[] = {
442 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C596_3),
443 .driver_data = SMBBA1 },
444 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C596B_3),
445 .driver_data = SMBBA1 },
446 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4),
447 .driver_data = SMBBA1 },
448 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8233_0),
449 .driver_data = SMBBA3 },
450 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8233A),
451 .driver_data = SMBBA3 },
452 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235),
453 .driver_data = SMBBA3 },
454 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237),
455 .driver_data = SMBBA3 },
456 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237A),
457 .driver_data = SMBBA3 },
458 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237S),
459 .driver_data = SMBBA3 },
460 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231_4),
461 .driver_data = SMBBA1 },
462 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8251),
463 .driver_data = SMBBA3 },
464 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_CX700),
465 .driver_data = SMBBA3 },
466 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX800),
467 .driver_data = SMBBA3 },
468 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX855),
469 .driver_data = SMBBA3 },
470 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX900),
471 .driver_data = SMBBA3 },
472 { 0, }
473};
474
475MODULE_DEVICE_TABLE(pci, vt596_ids);
476
477static struct pci_driver vt596_driver = {
478 .name = "vt596_smbus",
479 .id_table = vt596_ids,
480 .probe = vt596_probe,
481};
482
483static int __init i2c_vt596_init(void)
484{
485 return pci_register_driver(&vt596_driver);
486}
487
488
489static void __exit i2c_vt596_exit(void)
490{
491 pci_unregister_driver(&vt596_driver);
492 if (vt596_pdev != NULL) {
493 i2c_del_adapter(&vt596_adapter);
494 release_region(vt596_smba, 8);
495 pci_dev_put(vt596_pdev);
496 vt596_pdev = NULL;
497 }
498}
499
500MODULE_AUTHOR("Kyosti Malkki <kmalkki@cc.hut.fi>, "
501 "Mark D. Studebaker <mdsxyz123@yahoo.com> and "
502 "Jean Delvare <jdelvare@suse.de>");
503MODULE_DESCRIPTION("vt82c596 SMBus driver");
504MODULE_LICENSE("GPL");
505
506module_init(i2c_vt596_init);
507module_exit(i2c_vt596_exit);
508
