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45#include <linux/module.h>
46#include <linux/pci.h>
47#include <linux/kernel.h>
48#include <linux/stddef.h>
49#include <linux/ioport.h>
50#include <linux/i2c.h>
51#include <linux/delay.h>
52#include <linux/dmi.h>
53#include <linux/acpi.h>
54#include <linux/slab.h>
55#include <linux/io.h>
56
57MODULE_LICENSE("GPL");
58MODULE_AUTHOR("Hans-Frieder Vogt <hfvogt@gmx.net>");
59MODULE_DESCRIPTION("nForce2/3/4/5xx SMBus driver");
60
61
62struct nforce2_smbus {
63 struct i2c_adapter adapter;
64 int base;
65 int size;
66 int blockops;
67 int can_abort;
68};
69
70
71
72
73
74
75#define NFORCE_PCI_SMB1 0x50
76#define NFORCE_PCI_SMB2 0x54
77
78
79
80
81
82#define NVIDIA_SMB_PRTCL (smbus->base + 0x00)
83#define NVIDIA_SMB_STS (smbus->base + 0x01)
84#define NVIDIA_SMB_ADDR (smbus->base + 0x02)
85#define NVIDIA_SMB_CMD (smbus->base + 0x03)
86#define NVIDIA_SMB_DATA (smbus->base + 0x04)
87#define NVIDIA_SMB_BCNT (smbus->base + 0x24)
88
89#define NVIDIA_SMB_STATUS_ABRT (smbus->base + 0x3c)
90
91
92#define NVIDIA_SMB_CTRL (smbus->base + 0x3e)
93
94#define NVIDIA_SMB_STATUS_ABRT_STS 0x01
95
96#define NVIDIA_SMB_CTRL_ABORT 0x20
97#define NVIDIA_SMB_STS_DONE 0x80
98#define NVIDIA_SMB_STS_ALRM 0x40
99#define NVIDIA_SMB_STS_RES 0x20
100#define NVIDIA_SMB_STS_STATUS 0x1f
101
102#define NVIDIA_SMB_PRTCL_WRITE 0x00
103#define NVIDIA_SMB_PRTCL_READ 0x01
104#define NVIDIA_SMB_PRTCL_QUICK 0x02
105#define NVIDIA_SMB_PRTCL_BYTE 0x04
106#define NVIDIA_SMB_PRTCL_BYTE_DATA 0x06
107#define NVIDIA_SMB_PRTCL_WORD_DATA 0x08
108#define NVIDIA_SMB_PRTCL_BLOCK_DATA 0x0a
109#define NVIDIA_SMB_PRTCL_PEC 0x80
110
111
112#define MAX_TIMEOUT 100
113
114
115static const struct dmi_system_id nforce2_dmi_blacklist2[] = {
116 {
117 .ident = "DFI Lanparty NF4 Expert",
118 .matches = {
119 DMI_MATCH(DMI_BOARD_VENDOR, "DFI Corp,LTD"),
120 DMI_MATCH(DMI_BOARD_NAME, "LP UT NF4 Expert"),
121 },
122 },
123 { }
124};
125
126static struct pci_driver nforce2_driver;
127
128
129
130#if IS_ENABLED(CONFIG_I2C_NFORCE2_S4985)
131struct i2c_adapter *nforce2_smbus;
132EXPORT_SYMBOL_GPL(nforce2_smbus);
133
134static void nforce2_set_reference(struct i2c_adapter *adap)
135{
136 nforce2_smbus = adap;
137}
138#else
139static inline void nforce2_set_reference(struct i2c_adapter *adap) { }
140#endif
141
142static void nforce2_abort(struct i2c_adapter *adap)
143{
144 struct nforce2_smbus *smbus = adap->algo_data;
145 int timeout = 0;
146 unsigned char temp;
147
148 dev_dbg(&adap->dev, "Aborting current transaction\n");
149
150 outb_p(NVIDIA_SMB_CTRL_ABORT, NVIDIA_SMB_CTRL);
151 do {
152 msleep(1);
153 temp = inb_p(NVIDIA_SMB_STATUS_ABRT);
154 } while (!(temp & NVIDIA_SMB_STATUS_ABRT_STS) &&
155 (timeout++ < MAX_TIMEOUT));
156 if (!(temp & NVIDIA_SMB_STATUS_ABRT_STS))
157 dev_err(&adap->dev, "Can't reset the smbus\n");
158 outb_p(NVIDIA_SMB_STATUS_ABRT_STS, NVIDIA_SMB_STATUS_ABRT);
159}
160
161static int nforce2_check_status(struct i2c_adapter *adap)
162{
163 struct nforce2_smbus *smbus = adap->algo_data;
164 int timeout = 0;
165 unsigned char temp;
166
167 do {
168 msleep(1);
169 temp = inb_p(NVIDIA_SMB_STS);
170 } while ((!temp) && (timeout++ < MAX_TIMEOUT));
171
172 if (timeout > MAX_TIMEOUT) {
173 dev_dbg(&adap->dev, "SMBus Timeout!\n");
174 if (smbus->can_abort)
175 nforce2_abort(adap);
176 return -ETIMEDOUT;
177 }
178 if (!(temp & NVIDIA_SMB_STS_DONE) || (temp & NVIDIA_SMB_STS_STATUS)) {
179 dev_dbg(&adap->dev, "Transaction failed (0x%02x)!\n", temp);
180 return -EIO;
181 }
182 return 0;
183}
184
185
186static s32 nforce2_access(struct i2c_adapter *adap, u16 addr,
187 unsigned short flags, char read_write,
188 u8 command, int size, union i2c_smbus_data *data)
189{
190 struct nforce2_smbus *smbus = adap->algo_data;
191 unsigned char protocol, pec;
192 u8 len;
193 int i, status;
194
195 protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ :
196 NVIDIA_SMB_PRTCL_WRITE;
197 pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0;
198
199 switch (size) {
200 case I2C_SMBUS_QUICK:
201 protocol |= NVIDIA_SMB_PRTCL_QUICK;
202 read_write = I2C_SMBUS_WRITE;
203 break;
204
205 case I2C_SMBUS_BYTE:
206 if (read_write == I2C_SMBUS_WRITE)
207 outb_p(command, NVIDIA_SMB_CMD);
208 protocol |= NVIDIA_SMB_PRTCL_BYTE;
209 break;
210
211 case I2C_SMBUS_BYTE_DATA:
212 outb_p(command, NVIDIA_SMB_CMD);
213 if (read_write == I2C_SMBUS_WRITE)
214 outb_p(data->byte, NVIDIA_SMB_DATA);
215 protocol |= NVIDIA_SMB_PRTCL_BYTE_DATA;
216 break;
217
218 case I2C_SMBUS_WORD_DATA:
219 outb_p(command, NVIDIA_SMB_CMD);
220 if (read_write == I2C_SMBUS_WRITE) {
221 outb_p(data->word, NVIDIA_SMB_DATA);
222 outb_p(data->word >> 8, NVIDIA_SMB_DATA + 1);
223 }
224 protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec;
225 break;
226
227 case I2C_SMBUS_BLOCK_DATA:
228 outb_p(command, NVIDIA_SMB_CMD);
229 if (read_write == I2C_SMBUS_WRITE) {
230 len = data->block[0];
231 if ((len == 0) || (len > I2C_SMBUS_BLOCK_MAX)) {
232 dev_err(&adap->dev,
233 "Transaction failed (requested block size: %d)\n",
234 len);
235 return -EINVAL;
236 }
237 outb_p(len, NVIDIA_SMB_BCNT);
238 for (i = 0; i < I2C_SMBUS_BLOCK_MAX; i++)
239 outb_p(data->block[i + 1],
240 NVIDIA_SMB_DATA + i);
241 }
242 protocol |= NVIDIA_SMB_PRTCL_BLOCK_DATA | pec;
243 break;
244
245 default:
246 dev_err(&adap->dev, "Unsupported transaction %d\n", size);
247 return -EOPNOTSUPP;
248 }
249
250 outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR);
251 outb_p(protocol, NVIDIA_SMB_PRTCL);
252
253 status = nforce2_check_status(adap);
254 if (status)
255 return status;
256
257 if (read_write == I2C_SMBUS_WRITE)
258 return 0;
259
260 switch (size) {
261 case I2C_SMBUS_BYTE:
262 case I2C_SMBUS_BYTE_DATA:
263 data->byte = inb_p(NVIDIA_SMB_DATA);
264 break;
265
266 case I2C_SMBUS_WORD_DATA:
267 data->word = inb_p(NVIDIA_SMB_DATA) |
268 (inb_p(NVIDIA_SMB_DATA + 1) << 8);
269 break;
270
271 case I2C_SMBUS_BLOCK_DATA:
272 len = inb_p(NVIDIA_SMB_BCNT);
273 if ((len <= 0) || (len > I2C_SMBUS_BLOCK_MAX)) {
274 dev_err(&adap->dev,
275 "Transaction failed (received block size: 0x%02x)\n",
276 len);
277 return -EPROTO;
278 }
279 for (i = 0; i < len; i++)
280 data->block[i + 1] = inb_p(NVIDIA_SMB_DATA + i);
281 data->block[0] = len;
282 break;
283 }
284
285 return 0;
286}
287
288
289static u32 nforce2_func(struct i2c_adapter *adapter)
290{
291
292 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
293 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
294 I2C_FUNC_SMBUS_PEC |
295 (((struct nforce2_smbus *)adapter->algo_data)->blockops ?
296 I2C_FUNC_SMBUS_BLOCK_DATA : 0);
297}
298
299static const struct i2c_algorithm smbus_algorithm = {
300 .smbus_xfer = nforce2_access,
301 .functionality = nforce2_func,
302};
303
304
305static const struct pci_device_id nforce2_ids[] = {
306 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) },
307 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) },
308 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) },
309 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) },
310 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) },
311 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_SMBUS) },
312 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS) },
313 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS) },
314 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SMBUS) },
315 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP65_SMBUS) },
316 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP67_SMBUS) },
317 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP73_SMBUS) },
318 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP78S_SMBUS) },
319 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP79_SMBUS) },
320 { 0 }
321};
322
323MODULE_DEVICE_TABLE(pci, nforce2_ids);
324
325
326static int nforce2_probe_smb(struct pci_dev *dev, int bar, int alt_reg,
327 struct nforce2_smbus *smbus, const char *name)
328{
329 int error;
330
331 smbus->base = pci_resource_start(dev, bar);
332 if (smbus->base) {
333 smbus->size = pci_resource_len(dev, bar);
334 } else {
335
336 u16 iobase;
337
338 if (pci_read_config_word(dev, alt_reg, &iobase)
339 != PCIBIOS_SUCCESSFUL) {
340 dev_err(&dev->dev, "Error reading PCI config for %s\n",
341 name);
342 return -EIO;
343 }
344
345 smbus->base = iobase & PCI_BASE_ADDRESS_IO_MASK;
346 smbus->size = 64;
347 }
348
349 error = acpi_check_region(smbus->base, smbus->size,
350 nforce2_driver.name);
351 if (error)
352 return error;
353
354 if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) {
355 dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n",
356 smbus->base, smbus->base+smbus->size-1, name);
357 return -EBUSY;
358 }
359 smbus->adapter.owner = THIS_MODULE;
360 smbus->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
361 smbus->adapter.algo = &smbus_algorithm;
362 smbus->adapter.algo_data = smbus;
363 smbus->adapter.dev.parent = &dev->dev;
364 snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),
365 "SMBus nForce2 adapter at %04x", smbus->base);
366
367 error = i2c_add_adapter(&smbus->adapter);
368 if (error) {
369 release_region(smbus->base, smbus->size);
370 return error;
371 }
372 dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n",
373 smbus->base);
374 return 0;
375}
376
377
378static int nforce2_probe(struct pci_dev *dev, const struct pci_device_id *id)
379{
380 struct nforce2_smbus *smbuses;
381 int res1, res2;
382
383
384 smbuses = kzalloc(2 * sizeof(struct nforce2_smbus), GFP_KERNEL);
385 if (!smbuses)
386 return -ENOMEM;
387 pci_set_drvdata(dev, smbuses);
388
389 switch (dev->device) {
390 case PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS:
391 case PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS:
392 case PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS:
393 smbuses[0].blockops = 1;
394 smbuses[1].blockops = 1;
395 smbuses[0].can_abort = 1;
396 smbuses[1].can_abort = 1;
397 }
398
399
400 res1 = nforce2_probe_smb(dev, 4, NFORCE_PCI_SMB1, &smbuses[0], "SMB1");
401 if (res1 < 0)
402 smbuses[0].base = 0;
403
404
405 if (dmi_check_system(nforce2_dmi_blacklist2)) {
406 dev_err(&dev->dev, "Disabling SMB2 for safety reasons.\n");
407 res2 = -EPERM;
408 smbuses[1].base = 0;
409 } else {
410 res2 = nforce2_probe_smb(dev, 5, NFORCE_PCI_SMB2, &smbuses[1],
411 "SMB2");
412 if (res2 < 0)
413 smbuses[1].base = 0;
414 }
415
416 if ((res1 < 0) && (res2 < 0)) {
417
418 kfree(smbuses);
419 return -ENODEV;
420 }
421
422 nforce2_set_reference(&smbuses[0].adapter);
423 return 0;
424}
425
426
427static void nforce2_remove(struct pci_dev *dev)
428{
429 struct nforce2_smbus *smbuses = pci_get_drvdata(dev);
430
431 nforce2_set_reference(NULL);
432 if (smbuses[0].base) {
433 i2c_del_adapter(&smbuses[0].adapter);
434 release_region(smbuses[0].base, smbuses[0].size);
435 }
436 if (smbuses[1].base) {
437 i2c_del_adapter(&smbuses[1].adapter);
438 release_region(smbuses[1].base, smbuses[1].size);
439 }
440 kfree(smbuses);
441}
442
443static struct pci_driver nforce2_driver = {
444 .name = "nForce2_smbus",
445 .id_table = nforce2_ids,
446 .probe = nforce2_probe,
447 .remove = nforce2_remove,
448};
449
450module_pci_driver(nforce2_driver);
451
