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