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37#include <linux/module.h>
38#include <linux/pci.h>
39#include <linux/kernel.h>
40#include <linux/stddef.h>
41#include <linux/ioport.h>
42#include <linux/i2c.h>
43#include <linux/delay.h>
44#include <linux/dmi.h>
45#include <linux/acpi.h>
46#include <linux/slab.h>
47#include <linux/io.h>
48
49MODULE_LICENSE("GPL");
50MODULE_AUTHOR("Hans-Frieder Vogt <hfvogt@gmx.net>");
51MODULE_DESCRIPTION("nForce2/3/4/5xx SMBus driver");
52
53
54struct nforce2_smbus {
55 struct i2c_adapter adapter;
56 int base;
57 int size;
58 int blockops;
59 int can_abort;
60};
61
62
63
64
65
66
67#define NFORCE_PCI_SMB1 0x50
68#define NFORCE_PCI_SMB2 0x54
69
70
71
72
73
74#define NVIDIA_SMB_PRTCL (smbus->base + 0x00)
75#define NVIDIA_SMB_STS (smbus->base + 0x01)
76#define NVIDIA_SMB_ADDR (smbus->base + 0x02)
77#define NVIDIA_SMB_CMD (smbus->base + 0x03)
78#define NVIDIA_SMB_DATA (smbus->base + 0x04)
79#define NVIDIA_SMB_BCNT (smbus->base + 0x24)
80
81#define NVIDIA_SMB_STATUS_ABRT (smbus->base + 0x3c)
82
83
84#define NVIDIA_SMB_CTRL (smbus->base + 0x3e)
85
86#define NVIDIA_SMB_STATUS_ABRT_STS 0x01
87
88#define NVIDIA_SMB_CTRL_ABORT 0x20
89#define NVIDIA_SMB_STS_DONE 0x80
90#define NVIDIA_SMB_STS_ALRM 0x40
91#define NVIDIA_SMB_STS_RES 0x20
92#define NVIDIA_SMB_STS_STATUS 0x1f
93
94#define NVIDIA_SMB_PRTCL_WRITE 0x00
95#define NVIDIA_SMB_PRTCL_READ 0x01
96#define NVIDIA_SMB_PRTCL_QUICK 0x02
97#define NVIDIA_SMB_PRTCL_BYTE 0x04
98#define NVIDIA_SMB_PRTCL_BYTE_DATA 0x06
99#define NVIDIA_SMB_PRTCL_WORD_DATA 0x08
100#define NVIDIA_SMB_PRTCL_BLOCK_DATA 0x0a
101#define NVIDIA_SMB_PRTCL_PEC 0x80
102
103
104#define MAX_TIMEOUT 100
105
106
107static const struct dmi_system_id nforce2_dmi_blacklist2[] = {
108 {
109 .ident = "DFI Lanparty NF4 Expert",
110 .matches = {
111 DMI_MATCH(DMI_BOARD_VENDOR, "DFI Corp,LTD"),
112 DMI_MATCH(DMI_BOARD_NAME, "LP UT NF4 Expert"),
113 },
114 },
115 { }
116};
117
118static struct pci_driver nforce2_driver;
119
120
121
122#if IS_ENABLED(CONFIG_I2C_NFORCE2_S4985)
123struct i2c_adapter *nforce2_smbus;
124EXPORT_SYMBOL_GPL(nforce2_smbus);
125
126static void nforce2_set_reference(struct i2c_adapter *adap)
127{
128 nforce2_smbus = adap;
129}
130#else
131static inline void nforce2_set_reference(struct i2c_adapter *adap) { }
132#endif
133
134static void nforce2_abort(struct i2c_adapter *adap)
135{
136 struct nforce2_smbus *smbus = adap->algo_data;
137 int timeout = 0;
138 unsigned char temp;
139
140 dev_dbg(&adap->dev, "Aborting current transaction\n");
141
142 outb_p(NVIDIA_SMB_CTRL_ABORT, NVIDIA_SMB_CTRL);
143 do {
144 msleep(1);
145 temp = inb_p(NVIDIA_SMB_STATUS_ABRT);
146 } while (!(temp & NVIDIA_SMB_STATUS_ABRT_STS) &&
147 (timeout++ < MAX_TIMEOUT));
148 if (!(temp & NVIDIA_SMB_STATUS_ABRT_STS))
149 dev_err(&adap->dev, "Can't reset the smbus\n");
150 outb_p(NVIDIA_SMB_STATUS_ABRT_STS, NVIDIA_SMB_STATUS_ABRT);
151}
152
153static int nforce2_check_status(struct i2c_adapter *adap)
154{
155 struct nforce2_smbus *smbus = adap->algo_data;
156 int timeout = 0;
157 unsigned char temp;
158
159 do {
160 msleep(1);
161 temp = inb_p(NVIDIA_SMB_STS);
162 } while ((!temp) && (timeout++ < MAX_TIMEOUT));
163
164 if (timeout > MAX_TIMEOUT) {
165 dev_dbg(&adap->dev, "SMBus Timeout!\n");
166 if (smbus->can_abort)
167 nforce2_abort(adap);
168 return -ETIMEDOUT;
169 }
170 if (!(temp & NVIDIA_SMB_STS_DONE) || (temp & NVIDIA_SMB_STS_STATUS)) {
171 dev_dbg(&adap->dev, "Transaction failed (0x%02x)!\n", temp);
172 return -EIO;
173 }
174 return 0;
175}
176
177
178static s32 nforce2_access(struct i2c_adapter *adap, u16 addr,
179 unsigned short flags, char read_write,
180 u8 command, int size, union i2c_smbus_data *data)
181{
182 struct nforce2_smbus *smbus = adap->algo_data;
183 unsigned char protocol, pec;
184 u8 len;
185 int i, status;
186
187 protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ :
188 NVIDIA_SMB_PRTCL_WRITE;
189 pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0;
190
191 switch (size) {
192 case I2C_SMBUS_QUICK:
193 protocol |= NVIDIA_SMB_PRTCL_QUICK;
194 read_write = I2C_SMBUS_WRITE;
195 break;
196
197 case I2C_SMBUS_BYTE:
198 if (read_write == I2C_SMBUS_WRITE)
199 outb_p(command, NVIDIA_SMB_CMD);
200 protocol |= NVIDIA_SMB_PRTCL_BYTE;
201 break;
202
203 case I2C_SMBUS_BYTE_DATA:
204 outb_p(command, NVIDIA_SMB_CMD);
205 if (read_write == I2C_SMBUS_WRITE)
206 outb_p(data->byte, NVIDIA_SMB_DATA);
207 protocol |= NVIDIA_SMB_PRTCL_BYTE_DATA;
208 break;
209
210 case I2C_SMBUS_WORD_DATA:
211 outb_p(command, NVIDIA_SMB_CMD);
212 if (read_write == I2C_SMBUS_WRITE) {
213 outb_p(data->word, NVIDIA_SMB_DATA);
214 outb_p(data->word >> 8, NVIDIA_SMB_DATA + 1);
215 }
216 protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec;
217 break;
218
219 case I2C_SMBUS_BLOCK_DATA:
220 outb_p(command, NVIDIA_SMB_CMD);
221 if (read_write == I2C_SMBUS_WRITE) {
222 len = data->block[0];
223 if ((len == 0) || (len > I2C_SMBUS_BLOCK_MAX)) {
224 dev_err(&adap->dev,
225 "Transaction failed (requested block size: %d)\n",
226 len);
227 return -EINVAL;
228 }
229 outb_p(len, NVIDIA_SMB_BCNT);
230 for (i = 0; i < I2C_SMBUS_BLOCK_MAX; i++)
231 outb_p(data->block[i + 1],
232 NVIDIA_SMB_DATA + i);
233 }
234 protocol |= NVIDIA_SMB_PRTCL_BLOCK_DATA | pec;
235 break;
236
237 default:
238 dev_err(&adap->dev, "Unsupported transaction %d\n", size);
239 return -EOPNOTSUPP;
240 }
241
242 outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR);
243 outb_p(protocol, NVIDIA_SMB_PRTCL);
244
245 status = nforce2_check_status(adap);
246 if (status)
247 return status;
248
249 if (read_write == I2C_SMBUS_WRITE)
250 return 0;
251
252 switch (size) {
253 case I2C_SMBUS_BYTE:
254 case I2C_SMBUS_BYTE_DATA:
255 data->byte = inb_p(NVIDIA_SMB_DATA);
256 break;
257
258 case I2C_SMBUS_WORD_DATA:
259 data->word = inb_p(NVIDIA_SMB_DATA) |
260 (inb_p(NVIDIA_SMB_DATA + 1) << 8);
261 break;
262
263 case I2C_SMBUS_BLOCK_DATA:
264 len = inb_p(NVIDIA_SMB_BCNT);
265 if ((len <= 0) || (len > I2C_SMBUS_BLOCK_MAX)) {
266 dev_err(&adap->dev,
267 "Transaction failed (received block size: 0x%02x)\n",
268 len);
269 return -EPROTO;
270 }
271 for (i = 0; i < len; i++)
272 data->block[i + 1] = inb_p(NVIDIA_SMB_DATA + i);
273 data->block[0] = len;
274 break;
275 }
276
277 return 0;
278}
279
280
281static u32 nforce2_func(struct i2c_adapter *adapter)
282{
283
284 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
285 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
286 I2C_FUNC_SMBUS_PEC |
287 (((struct nforce2_smbus *)adapter->algo_data)->blockops ?
288 I2C_FUNC_SMBUS_BLOCK_DATA : 0);
289}
290
291static const struct i2c_algorithm smbus_algorithm = {
292 .smbus_xfer = nforce2_access,
293 .functionality = nforce2_func,
294};
295
296
297static const struct pci_device_id nforce2_ids[] = {
298 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) },
299 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) },
300 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) },
301 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) },
302 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) },
303 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_SMBUS) },
304 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS) },
305 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS) },
306 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SMBUS) },
307 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP65_SMBUS) },
308 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP67_SMBUS) },
309 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP73_SMBUS) },
310 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP78S_SMBUS) },
311 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP79_SMBUS) },
312 { 0 }
313};
314
315MODULE_DEVICE_TABLE(pci, nforce2_ids);
316
317
318static int nforce2_probe_smb(struct pci_dev *dev, int bar, int alt_reg,
319 struct nforce2_smbus *smbus, const char *name)
320{
321 int error;
322
323 smbus->base = pci_resource_start(dev, bar);
324 if (smbus->base) {
325 smbus->size = pci_resource_len(dev, bar);
326 } else {
327
328 u16 iobase;
329
330 if (pci_read_config_word(dev, alt_reg, &iobase)
331 != PCIBIOS_SUCCESSFUL) {
332 dev_err(&dev->dev, "Error reading PCI config for %s\n",
333 name);
334 return -EIO;
335 }
336
337 smbus->base = iobase & PCI_BASE_ADDRESS_IO_MASK;
338 smbus->size = 64;
339 }
340
341 error = acpi_check_region(smbus->base, smbus->size,
342 nforce2_driver.name);
343 if (error)
344 return error;
345
346 if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) {
347 dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n",
348 smbus->base, smbus->base+smbus->size-1, name);
349 return -EBUSY;
350 }
351 smbus->adapter.owner = THIS_MODULE;
352 smbus->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
353 smbus->adapter.algo = &smbus_algorithm;
354 smbus->adapter.algo_data = smbus;
355 smbus->adapter.dev.parent = &dev->dev;
356 snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),
357 "SMBus nForce2 adapter at %04x", smbus->base);
358
359 error = i2c_add_adapter(&smbus->adapter);
360 if (error) {
361 release_region(smbus->base, smbus->size);
362 return error;
363 }
364 dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n",
365 smbus->base);
366 return 0;
367}
368
369
370static int nforce2_probe(struct pci_dev *dev, const struct pci_device_id *id)
371{
372 struct nforce2_smbus *smbuses;
373 int res1, res2;
374
375
376 smbuses = kcalloc(2, sizeof(struct nforce2_smbus), GFP_KERNEL);
377 if (!smbuses)
378 return -ENOMEM;
379 pci_set_drvdata(dev, smbuses);
380
381 switch (dev->device) {
382 case PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS:
383 case PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS:
384 case PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS:
385 smbuses[0].blockops = 1;
386 smbuses[1].blockops = 1;
387 smbuses[0].can_abort = 1;
388 smbuses[1].can_abort = 1;
389 }
390
391
392 res1 = nforce2_probe_smb(dev, 4, NFORCE_PCI_SMB1, &smbuses[0], "SMB1");
393 if (res1 < 0)
394 smbuses[0].base = 0;
395
396
397 if (dmi_check_system(nforce2_dmi_blacklist2)) {
398 dev_err(&dev->dev, "Disabling SMB2 for safety reasons.\n");
399 res2 = -EPERM;
400 smbuses[1].base = 0;
401 } else {
402 res2 = nforce2_probe_smb(dev, 5, NFORCE_PCI_SMB2, &smbuses[1],
403 "SMB2");
404 if (res2 < 0)
405 smbuses[1].base = 0;
406 }
407
408 if ((res1 < 0) && (res2 < 0)) {
409
410 kfree(smbuses);
411 return -ENODEV;
412 }
413
414 nforce2_set_reference(&smbuses[0].adapter);
415 return 0;
416}
417
418
419static void nforce2_remove(struct pci_dev *dev)
420{
421 struct nforce2_smbus *smbuses = pci_get_drvdata(dev);
422
423 nforce2_set_reference(NULL);
424 if (smbuses[0].base) {
425 i2c_del_adapter(&smbuses[0].adapter);
426 release_region(smbuses[0].base, smbuses[0].size);
427 }
428 if (smbuses[1].base) {
429 i2c_del_adapter(&smbuses[1].adapter);
430 release_region(smbuses[1].base, smbuses[1].size);
431 }
432 kfree(smbuses);
433}
434
435static struct pci_driver nforce2_driver = {
436 .name = "nForce2_smbus",
437 .id_table = nforce2_ids,
438 .probe = nforce2_probe,
439 .remove = nforce2_remove,
440};
441
442module_pci_driver(nforce2_driver);
443
