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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 <linux/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 bool 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 result = -ENXIO;
189 dev_dbg(&vt596_adapter.dev, "No response\n");
190 }
191
192
193 if (temp & 0x1F)
194 outb_p(temp, SMBHSTSTS);
195
196 vt596_dump_regs("Transaction (post)", size);
197
198 return result;
199}
200
201
202static s32 vt596_access(struct i2c_adapter *adap, u16 addr,
203 unsigned short flags, char read_write, u8 command,
204 int size, union i2c_smbus_data *data)
205{
206 int i;
207 int status;
208
209 switch (size) {
210 case I2C_SMBUS_QUICK:
211 size = VT596_QUICK;
212 break;
213 case I2C_SMBUS_BYTE:
214 if (read_write == I2C_SMBUS_WRITE)
215 outb_p(command, SMBHSTCMD);
216 size = VT596_BYTE;
217 break;
218 case I2C_SMBUS_BYTE_DATA:
219 outb_p(command, SMBHSTCMD);
220 if (read_write == I2C_SMBUS_WRITE)
221 outb_p(data->byte, SMBHSTDAT0);
222 size = VT596_BYTE_DATA;
223 break;
224 case I2C_SMBUS_WORD_DATA:
225 outb_p(command, SMBHSTCMD);
226 if (read_write == I2C_SMBUS_WRITE) {
227 outb_p(data->word & 0xff, SMBHSTDAT0);
228 outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
229 }
230 size = VT596_WORD_DATA;
231 break;
232 case I2C_SMBUS_PROC_CALL:
233 outb_p(command, SMBHSTCMD);
234 outb_p(data->word & 0xff, SMBHSTDAT0);
235 outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
236 size = VT596_PROC_CALL;
237 break;
238 case I2C_SMBUS_I2C_BLOCK_DATA:
239 if (!(vt596_features & FEATURE_I2CBLOCK))
240 goto exit_unsupported;
241 if (read_write == I2C_SMBUS_READ)
242 outb_p(data->block[0], SMBHSTDAT0);
243
244 case I2C_SMBUS_BLOCK_DATA:
245 outb_p(command, SMBHSTCMD);
246 if (read_write == I2C_SMBUS_WRITE) {
247 u8 len = data->block[0];
248 if (len > I2C_SMBUS_BLOCK_MAX)
249 len = I2C_SMBUS_BLOCK_MAX;
250 outb_p(len, SMBHSTDAT0);
251 inb_p(SMBHSTCNT);
252 for (i = 1; i <= len; i++)
253 outb_p(data->block[i], SMBBLKDAT);
254 }
255 size = (size == I2C_SMBUS_I2C_BLOCK_DATA) ?
256 VT596_I2C_BLOCK_DATA : VT596_BLOCK_DATA;
257 break;
258 default:
259 goto exit_unsupported;
260 }
261
262 outb_p(((addr & 0x7f) << 1) | read_write, SMBHSTADD);
263
264 status = vt596_transaction(size);
265 if (status)
266 return status;
267
268 if (size == VT596_PROC_CALL)
269 read_write = I2C_SMBUS_READ;
270
271 if ((read_write == I2C_SMBUS_WRITE) || (size == VT596_QUICK))
272 return 0;
273
274 switch (size) {
275 case VT596_BYTE:
276 case VT596_BYTE_DATA:
277 data->byte = inb_p(SMBHSTDAT0);
278 break;
279 case VT596_WORD_DATA:
280 case VT596_PROC_CALL:
281 data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
282 break;
283 case VT596_I2C_BLOCK_DATA:
284 case VT596_BLOCK_DATA:
285 data->block[0] = inb_p(SMBHSTDAT0);
286 if (data->block[0] > I2C_SMBUS_BLOCK_MAX)
287 data->block[0] = I2C_SMBUS_BLOCK_MAX;
288 inb_p(SMBHSTCNT);
289 for (i = 1; i <= data->block[0]; i++)
290 data->block[i] = inb_p(SMBBLKDAT);
291 break;
292 }
293 return 0;
294
295exit_unsupported:
296 dev_warn(&vt596_adapter.dev, "Unsupported transaction %d\n",
297 size);
298 return -EOPNOTSUPP;
299}
300
301static u32 vt596_func(struct i2c_adapter *adapter)
302{
303 u32 func = I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
304 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
305 I2C_SMBUS_PROC_CALL | I2C_FUNC_SMBUS_BLOCK_DATA;
306
307 if (vt596_features & FEATURE_I2CBLOCK)
308 func |= I2C_FUNC_SMBUS_I2C_BLOCK;
309 return func;
310}
311
312static const struct i2c_algorithm smbus_algorithm = {
313 .smbus_xfer = vt596_access,
314 .functionality = vt596_func,
315};
316
317static struct i2c_adapter vt596_adapter = {
318 .owner = THIS_MODULE,
319 .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
320 .algo = &smbus_algorithm,
321};
322
323static int vt596_probe(struct pci_dev *pdev,
324 const struct pci_device_id *id)
325{
326 unsigned char temp;
327 int error;
328
329
330 if (force_addr) {
331 vt596_smba = force_addr & 0xfff0;
332 force = 0;
333 goto found;
334 }
335
336 if ((pci_read_config_word(pdev, id->driver_data, &vt596_smba)) ||
337 !(vt596_smba & 0x0001)) {
338
339 if (id->device == PCI_DEVICE_ID_VIA_82C596_3 &&
340 !pci_read_config_word(pdev, SMBBA2, &vt596_smba) &&
341 (vt596_smba & 0x0001)) {
342 SMBHSTCFG = 0x84;
343 } else {
344
345 dev_err(&pdev->dev, "Cannot configure "
346 "SMBus I/O Base address\n");
347 return -ENODEV;
348 }
349 }
350
351 vt596_smba &= 0xfff0;
352 if (vt596_smba == 0) {
353 dev_err(&pdev->dev, "SMBus base address "
354 "uninitialized - upgrade BIOS or use "
355 "force_addr=0xaddr\n");
356 return -ENODEV;
357 }
358
359found:
360 error = acpi_check_region(vt596_smba, 8, vt596_driver.name);
361 if (error)
362 return -ENODEV;
363
364 if (!request_region(vt596_smba, 8, vt596_driver.name)) {
365 dev_err(&pdev->dev, "SMBus region 0x%x already in use!\n",
366 vt596_smba);
367 return -ENODEV;
368 }
369
370 pci_read_config_byte(pdev, SMBHSTCFG, &temp);
371
372
373 if (force_addr) {
374 pci_write_config_byte(pdev, SMBHSTCFG, temp & 0xfe);
375 pci_write_config_word(pdev, id->driver_data, vt596_smba);
376 pci_write_config_byte(pdev, SMBHSTCFG, temp | 0x01);
377 dev_warn(&pdev->dev, "WARNING: SMBus interface set to new "
378 "address 0x%04x!\n", vt596_smba);
379 } else if (!(temp & 0x01)) {
380 if (force) {
381
382
383
384
385
386
387 pci_write_config_byte(pdev, SMBHSTCFG, temp | 0x01);
388 dev_info(&pdev->dev, "Enabling SMBus device\n");
389 } else {
390 dev_err(&pdev->dev, "SMBUS: Error: Host SMBus "
391 "controller not enabled! - upgrade BIOS or "
392 "use force=1\n");
393 error = -ENODEV;
394 goto release_region;
395 }
396 }
397
398 dev_dbg(&pdev->dev, "VT596_smba = 0x%X\n", vt596_smba);
399
400 switch (pdev->device) {
401 case PCI_DEVICE_ID_VIA_CX700:
402 case PCI_DEVICE_ID_VIA_VX800:
403 case PCI_DEVICE_ID_VIA_VX855:
404 case PCI_DEVICE_ID_VIA_VX900:
405 case PCI_DEVICE_ID_VIA_8251:
406 case PCI_DEVICE_ID_VIA_8237:
407 case PCI_DEVICE_ID_VIA_8237A:
408 case PCI_DEVICE_ID_VIA_8237S:
409 case PCI_DEVICE_ID_VIA_8235:
410 case PCI_DEVICE_ID_VIA_8233A:
411 case PCI_DEVICE_ID_VIA_8233_0:
412 vt596_features |= FEATURE_I2CBLOCK;
413 break;
414 case PCI_DEVICE_ID_VIA_82C686_4:
415
416
417 if (pdev->revision >= 0x40)
418 vt596_features |= FEATURE_I2CBLOCK;
419 break;
420 }
421
422 vt596_adapter.dev.parent = &pdev->dev;
423 snprintf(vt596_adapter.name, sizeof(vt596_adapter.name),
424 "SMBus Via Pro adapter at %04x", vt596_smba);
425
426 vt596_pdev = pci_dev_get(pdev);
427 error = i2c_add_adapter(&vt596_adapter);
428 if (error) {
429 pci_dev_put(vt596_pdev);
430 vt596_pdev = NULL;
431 goto release_region;
432 }
433
434
435
436
437
438 return -ENODEV;
439
440release_region:
441 release_region(vt596_smba, 8);
442 return error;
443}
444
445static DEFINE_PCI_DEVICE_TABLE(vt596_ids) = {
446 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C596_3),
447 .driver_data = SMBBA1 },
448 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C596B_3),
449 .driver_data = SMBBA1 },
450 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4),
451 .driver_data = SMBBA1 },
452 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8233_0),
453 .driver_data = SMBBA3 },
454 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8233A),
455 .driver_data = SMBBA3 },
456 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235),
457 .driver_data = SMBBA3 },
458 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237),
459 .driver_data = SMBBA3 },
460 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237A),
461 .driver_data = SMBBA3 },
462 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237S),
463 .driver_data = SMBBA3 },
464 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231_4),
465 .driver_data = SMBBA1 },
466 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8251),
467 .driver_data = SMBBA3 },
468 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_CX700),
469 .driver_data = SMBBA3 },
470 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX800),
471 .driver_data = SMBBA3 },
472 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX855),
473 .driver_data = SMBBA3 },
474 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX900),
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
