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beb58aa3 OJ |
1 | /* |
2 | * Copyright (C) 2006-2007 PA Semi, Inc | |
3 | * | |
4 | * SMBus host driver for PA Semi PWRficient | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/pci.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/stddef.h> | |
24 | #include <linux/sched.h> | |
25 | #include <linux/i2c.h> | |
26 | #include <linux/delay.h> | |
27 | #include <asm/io.h> | |
28 | ||
29 | static struct pci_driver pasemi_smb_driver; | |
30 | ||
31 | struct pasemi_smbus { | |
32 | struct pci_dev *dev; | |
33 | struct i2c_adapter adapter; | |
34 | unsigned long base; | |
35 | int size; | |
36 | }; | |
37 | ||
38 | /* Register offsets */ | |
39 | #define REG_MTXFIFO 0x00 | |
40 | #define REG_MRXFIFO 0x04 | |
41 | #define REG_SMSTA 0x14 | |
42 | #define REG_CTL 0x1c | |
43 | ||
44 | /* Register defs */ | |
45 | #define MTXFIFO_READ 0x00000400 | |
46 | #define MTXFIFO_STOP 0x00000200 | |
47 | #define MTXFIFO_START 0x00000100 | |
48 | #define MTXFIFO_DATA_M 0x000000ff | |
49 | ||
50 | #define MRXFIFO_EMPTY 0x00000100 | |
51 | #define MRXFIFO_DATA_M 0x000000ff | |
52 | ||
53 | #define SMSTA_XEN 0x08000000 | |
be8a1f7c | 54 | #define SMSTA_MTN 0x00200000 |
beb58aa3 OJ |
55 | |
56 | #define CTL_MRR 0x00000400 | |
57 | #define CTL_MTR 0x00000200 | |
58 | #define CTL_CLK_M 0x000000ff | |
59 | ||
60 | #define CLK_100K_DIV 84 | |
61 | #define CLK_400K_DIV 21 | |
62 | ||
63 | static inline void reg_write(struct pasemi_smbus *smbus, int reg, int val) | |
64 | { | |
65 | dev_dbg(&smbus->dev->dev, "smbus write reg %lx val %08x\n", | |
66 | smbus->base + reg, val); | |
67 | outl(val, smbus->base + reg); | |
68 | } | |
69 | ||
70 | static inline int reg_read(struct pasemi_smbus *smbus, int reg) | |
71 | { | |
72 | int ret; | |
73 | ret = inl(smbus->base + reg); | |
74 | dev_dbg(&smbus->dev->dev, "smbus read reg %lx val %08x\n", | |
75 | smbus->base + reg, ret); | |
76 | return ret; | |
77 | } | |
78 | ||
79 | #define TXFIFO_WR(smbus, reg) reg_write((smbus), REG_MTXFIFO, (reg)) | |
80 | #define RXFIFO_RD(smbus) reg_read((smbus), REG_MRXFIFO) | |
81 | ||
82 | static void pasemi_smb_clear(struct pasemi_smbus *smbus) | |
83 | { | |
84 | unsigned int status; | |
85 | ||
86 | status = reg_read(smbus, REG_SMSTA); | |
87 | reg_write(smbus, REG_SMSTA, status); | |
88 | } | |
89 | ||
90 | static unsigned int pasemi_smb_waitready(struct pasemi_smbus *smbus) | |
91 | { | |
92 | int timeout = 10; | |
93 | unsigned int status; | |
94 | ||
95 | status = reg_read(smbus, REG_SMSTA); | |
96 | ||
97 | while (!(status & SMSTA_XEN) && timeout--) { | |
98 | msleep(1); | |
99 | status = reg_read(smbus, REG_SMSTA); | |
100 | } | |
101 | ||
be8a1f7c OJ |
102 | /* Got NACK? */ |
103 | if (status & SMSTA_MTN) | |
104 | return -ENXIO; | |
105 | ||
beb58aa3 OJ |
106 | if (timeout < 0) { |
107 | dev_warn(&smbus->dev->dev, "Timeout, status 0x%08x\n", status); | |
108 | reg_write(smbus, REG_SMSTA, status); | |
109 | return -ETIME; | |
110 | } | |
111 | ||
112 | /* Clear XEN */ | |
113 | reg_write(smbus, REG_SMSTA, SMSTA_XEN); | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | static int pasemi_i2c_xfer_msg(struct i2c_adapter *adapter, | |
119 | struct i2c_msg *msg, int stop) | |
120 | { | |
121 | struct pasemi_smbus *smbus = adapter->algo_data; | |
122 | int read, i, err; | |
123 | u32 rd; | |
124 | ||
125 | read = msg->flags & I2C_M_RD ? 1 : 0; | |
126 | ||
127 | TXFIFO_WR(smbus, MTXFIFO_START | (msg->addr << 1) | read); | |
128 | ||
129 | if (read) { | |
130 | TXFIFO_WR(smbus, msg->len | MTXFIFO_READ | | |
131 | (stop ? MTXFIFO_STOP : 0)); | |
132 | ||
133 | err = pasemi_smb_waitready(smbus); | |
134 | if (err) | |
135 | goto reset_out; | |
136 | ||
137 | for (i = 0; i < msg->len; i++) { | |
138 | rd = RXFIFO_RD(smbus); | |
139 | if (rd & MRXFIFO_EMPTY) { | |
140 | err = -ENODATA; | |
141 | goto reset_out; | |
142 | } | |
143 | msg->buf[i] = rd & MRXFIFO_DATA_M; | |
144 | } | |
145 | } else { | |
146 | for (i = 0; i < msg->len - 1; i++) | |
147 | TXFIFO_WR(smbus, msg->buf[i]); | |
148 | ||
080dfbe1 | 149 | TXFIFO_WR(smbus, msg->buf[msg->len-1] | |
beb58aa3 OJ |
150 | (stop ? MTXFIFO_STOP : 0)); |
151 | } | |
152 | ||
153 | return 0; | |
154 | ||
155 | reset_out: | |
156 | reg_write(smbus, REG_CTL, (CTL_MTR | CTL_MRR | | |
157 | (CLK_100K_DIV & CTL_CLK_M))); | |
158 | return err; | |
159 | } | |
160 | ||
161 | static int pasemi_i2c_xfer(struct i2c_adapter *adapter, | |
162 | struct i2c_msg *msgs, int num) | |
163 | { | |
164 | struct pasemi_smbus *smbus = adapter->algo_data; | |
165 | int ret, i; | |
166 | ||
167 | pasemi_smb_clear(smbus); | |
168 | ||
169 | ret = 0; | |
170 | ||
171 | for (i = 0; i < num && !ret; i++) | |
172 | ret = pasemi_i2c_xfer_msg(adapter, &msgs[i], (i == (num - 1))); | |
173 | ||
174 | return ret ? ret : num; | |
175 | } | |
176 | ||
177 | static int pasemi_smb_xfer(struct i2c_adapter *adapter, | |
178 | u16 addr, unsigned short flags, char read_write, u8 command, | |
179 | int size, union i2c_smbus_data *data) | |
180 | { | |
181 | struct pasemi_smbus *smbus = adapter->algo_data; | |
182 | unsigned int rd; | |
183 | int read_flag, err; | |
184 | int len = 0, i; | |
185 | ||
186 | /* All our ops take 8-bit shifted addresses */ | |
187 | addr <<= 1; | |
188 | read_flag = read_write == I2C_SMBUS_READ; | |
189 | ||
190 | pasemi_smb_clear(smbus); | |
191 | ||
192 | switch (size) { | |
193 | case I2C_SMBUS_QUICK: | |
194 | TXFIFO_WR(smbus, addr | read_flag | MTXFIFO_START | | |
195 | MTXFIFO_STOP); | |
196 | break; | |
197 | case I2C_SMBUS_BYTE: | |
198 | TXFIFO_WR(smbus, addr | read_flag | MTXFIFO_START); | |
199 | if (read_write) | |
200 | TXFIFO_WR(smbus, 1 | MTXFIFO_STOP | MTXFIFO_READ); | |
201 | else | |
202 | TXFIFO_WR(smbus, MTXFIFO_STOP | command); | |
203 | break; | |
204 | case I2C_SMBUS_BYTE_DATA: | |
205 | TXFIFO_WR(smbus, addr | MTXFIFO_START); | |
206 | TXFIFO_WR(smbus, command); | |
207 | if (read_write) { | |
208 | TXFIFO_WR(smbus, addr | I2C_SMBUS_READ | MTXFIFO_START); | |
209 | TXFIFO_WR(smbus, 1 | MTXFIFO_READ | MTXFIFO_STOP); | |
210 | } else { | |
211 | TXFIFO_WR(smbus, MTXFIFO_STOP | data->byte); | |
212 | } | |
213 | break; | |
214 | case I2C_SMBUS_WORD_DATA: | |
215 | TXFIFO_WR(smbus, addr | MTXFIFO_START); | |
216 | TXFIFO_WR(smbus, command); | |
217 | if (read_write) { | |
218 | TXFIFO_WR(smbus, addr | I2C_SMBUS_READ | MTXFIFO_START); | |
219 | TXFIFO_WR(smbus, 2 | MTXFIFO_READ | MTXFIFO_STOP); | |
220 | } else { | |
221 | TXFIFO_WR(smbus, data->word & MTXFIFO_DATA_M); | |
222 | TXFIFO_WR(smbus, MTXFIFO_STOP | (data->word >> 8)); | |
223 | } | |
224 | break; | |
225 | case I2C_SMBUS_BLOCK_DATA: | |
226 | TXFIFO_WR(smbus, addr | MTXFIFO_START); | |
227 | TXFIFO_WR(smbus, command); | |
228 | if (read_write) { | |
229 | TXFIFO_WR(smbus, addr | I2C_SMBUS_READ | MTXFIFO_START); | |
230 | TXFIFO_WR(smbus, 1 | MTXFIFO_READ); | |
231 | rd = RXFIFO_RD(smbus); | |
232 | len = min_t(u8, (rd & MRXFIFO_DATA_M), | |
233 | I2C_SMBUS_BLOCK_MAX); | |
080dfbe1 | 234 | TXFIFO_WR(smbus, len | MTXFIFO_READ | |
beb58aa3 OJ |
235 | MTXFIFO_STOP); |
236 | } else { | |
237 | len = min_t(u8, data->block[0], I2C_SMBUS_BLOCK_MAX); | |
238 | TXFIFO_WR(smbus, len); | |
239 | for (i = 1; i < len; i++) | |
240 | TXFIFO_WR(smbus, data->block[i]); | |
241 | TXFIFO_WR(smbus, data->block[len] | MTXFIFO_STOP); | |
242 | } | |
243 | break; | |
244 | case I2C_SMBUS_PROC_CALL: | |
245 | read_write = I2C_SMBUS_READ; | |
246 | TXFIFO_WR(smbus, addr | MTXFIFO_START); | |
247 | TXFIFO_WR(smbus, command); | |
248 | TXFIFO_WR(smbus, data->word & MTXFIFO_DATA_M); | |
249 | TXFIFO_WR(smbus, (data->word >> 8) & MTXFIFO_DATA_M); | |
250 | TXFIFO_WR(smbus, addr | I2C_SMBUS_READ | MTXFIFO_START); | |
251 | TXFIFO_WR(smbus, 2 | MTXFIFO_STOP | MTXFIFO_READ); | |
252 | break; | |
253 | case I2C_SMBUS_BLOCK_PROC_CALL: | |
254 | len = min_t(u8, data->block[0], I2C_SMBUS_BLOCK_MAX - 1); | |
255 | read_write = I2C_SMBUS_READ; | |
256 | TXFIFO_WR(smbus, addr | MTXFIFO_START); | |
257 | TXFIFO_WR(smbus, command); | |
258 | TXFIFO_WR(smbus, len); | |
259 | for (i = 1; i <= len; i++) | |
260 | TXFIFO_WR(smbus, data->block[i]); | |
261 | TXFIFO_WR(smbus, addr | I2C_SMBUS_READ); | |
262 | TXFIFO_WR(smbus, MTXFIFO_READ | 1); | |
263 | rd = RXFIFO_RD(smbus); | |
264 | len = min_t(u8, (rd & MRXFIFO_DATA_M), | |
265 | I2C_SMBUS_BLOCK_MAX - len); | |
080dfbe1 | 266 | TXFIFO_WR(smbus, len | MTXFIFO_READ | MTXFIFO_STOP); |
beb58aa3 OJ |
267 | break; |
268 | ||
269 | default: | |
270 | dev_warn(&adapter->dev, "Unsupported transaction %d\n", size); | |
271 | return -EINVAL; | |
272 | } | |
273 | ||
274 | err = pasemi_smb_waitready(smbus); | |
275 | if (err) | |
276 | goto reset_out; | |
277 | ||
278 | if (read_write == I2C_SMBUS_WRITE) | |
279 | return 0; | |
280 | ||
281 | switch (size) { | |
282 | case I2C_SMBUS_BYTE: | |
283 | case I2C_SMBUS_BYTE_DATA: | |
284 | rd = RXFIFO_RD(smbus); | |
285 | if (rd & MRXFIFO_EMPTY) { | |
286 | err = -ENODATA; | |
287 | goto reset_out; | |
288 | } | |
289 | data->byte = rd & MRXFIFO_DATA_M; | |
290 | break; | |
291 | case I2C_SMBUS_WORD_DATA: | |
292 | case I2C_SMBUS_PROC_CALL: | |
293 | rd = RXFIFO_RD(smbus); | |
294 | if (rd & MRXFIFO_EMPTY) { | |
295 | err = -ENODATA; | |
296 | goto reset_out; | |
297 | } | |
298 | data->word = rd & MRXFIFO_DATA_M; | |
299 | rd = RXFIFO_RD(smbus); | |
300 | if (rd & MRXFIFO_EMPTY) { | |
301 | err = -ENODATA; | |
302 | goto reset_out; | |
303 | } | |
304 | data->word |= (rd & MRXFIFO_DATA_M) << 8; | |
305 | break; | |
306 | case I2C_SMBUS_BLOCK_DATA: | |
307 | case I2C_SMBUS_BLOCK_PROC_CALL: | |
308 | data->block[0] = len; | |
309 | for (i = 1; i <= len; i ++) { | |
310 | rd = RXFIFO_RD(smbus); | |
311 | if (rd & MRXFIFO_EMPTY) { | |
312 | err = -ENODATA; | |
313 | goto reset_out; | |
314 | } | |
315 | data->block[i] = rd & MRXFIFO_DATA_M; | |
316 | } | |
317 | break; | |
318 | } | |
319 | ||
320 | return 0; | |
321 | ||
322 | reset_out: | |
323 | reg_write(smbus, REG_CTL, (CTL_MTR | CTL_MRR | | |
324 | (CLK_100K_DIV & CTL_CLK_M))); | |
325 | return err; | |
326 | } | |
327 | ||
328 | static u32 pasemi_smb_func(struct i2c_adapter *adapter) | |
329 | { | |
330 | return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | | |
331 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | | |
332 | I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_PROC_CALL | | |
333 | I2C_FUNC_SMBUS_BLOCK_PROC_CALL | I2C_FUNC_I2C; | |
334 | } | |
335 | ||
336 | static const struct i2c_algorithm smbus_algorithm = { | |
337 | .master_xfer = pasemi_i2c_xfer, | |
338 | .smbus_xfer = pasemi_smb_xfer, | |
339 | .functionality = pasemi_smb_func, | |
340 | }; | |
341 | ||
342 | static int __devinit pasemi_smb_probe(struct pci_dev *dev, | |
343 | const struct pci_device_id *id) | |
344 | { | |
345 | struct pasemi_smbus *smbus; | |
346 | int error; | |
347 | ||
348 | if (!(pci_resource_flags(dev, 0) & IORESOURCE_IO)) | |
349 | return -ENODEV; | |
350 | ||
351 | smbus = kzalloc(sizeof(struct pasemi_smbus), GFP_KERNEL); | |
352 | if (!smbus) | |
353 | return -ENOMEM; | |
354 | ||
355 | smbus->dev = dev; | |
356 | smbus->base = pci_resource_start(dev, 0); | |
357 | smbus->size = pci_resource_len(dev, 0); | |
358 | ||
359 | if (!request_region(smbus->base, smbus->size, | |
360 | pasemi_smb_driver.name)) { | |
361 | error = -EBUSY; | |
362 | goto out_kfree; | |
363 | } | |
364 | ||
365 | smbus->adapter.owner = THIS_MODULE; | |
2096b956 | 366 | snprintf(smbus->adapter.name, sizeof(smbus->adapter.name), |
beb58aa3 | 367 | "PA Semi SMBus adapter at 0x%lx", smbus->base); |
3401b2ff | 368 | smbus->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD; |
beb58aa3 OJ |
369 | smbus->adapter.algo = &smbus_algorithm; |
370 | smbus->adapter.algo_data = smbus; | |
ccf60d85 | 371 | smbus->adapter.nr = PCI_FUNC(dev->devfn); |
beb58aa3 | 372 | |
ff23f3ea | 373 | /* set up the sysfs linkage to our parent device */ |
beb58aa3 OJ |
374 | smbus->adapter.dev.parent = &dev->dev; |
375 | ||
376 | reg_write(smbus, REG_CTL, (CTL_MTR | CTL_MRR | | |
377 | (CLK_100K_DIV & CTL_CLK_M))); | |
378 | ||
ccf60d85 | 379 | error = i2c_add_numbered_adapter(&smbus->adapter); |
beb58aa3 OJ |
380 | if (error) |
381 | goto out_release_region; | |
382 | ||
383 | pci_set_drvdata(dev, smbus); | |
384 | ||
385 | return 0; | |
386 | ||
387 | out_release_region: | |
388 | release_region(smbus->base, smbus->size); | |
389 | out_kfree: | |
390 | kfree(smbus); | |
391 | return error; | |
392 | } | |
393 | ||
394 | static void __devexit pasemi_smb_remove(struct pci_dev *dev) | |
395 | { | |
396 | struct pasemi_smbus *smbus = pci_get_drvdata(dev); | |
397 | ||
398 | i2c_del_adapter(&smbus->adapter); | |
399 | release_region(smbus->base, smbus->size); | |
400 | kfree(smbus); | |
401 | } | |
402 | ||
403 | static struct pci_device_id pasemi_smb_ids[] = { | |
404 | { PCI_DEVICE(0x1959, 0xa003) }, | |
405 | { 0, } | |
406 | }; | |
407 | ||
408 | MODULE_DEVICE_TABLE(pci, pasemi_smb_ids); | |
409 | ||
410 | static struct pci_driver pasemi_smb_driver = { | |
411 | .name = "i2c-pasemi", | |
412 | .id_table = pasemi_smb_ids, | |
413 | .probe = pasemi_smb_probe, | |
414 | .remove = __devexit_p(pasemi_smb_remove), | |
415 | }; | |
416 | ||
417 | static int __init pasemi_smb_init(void) | |
418 | { | |
419 | return pci_register_driver(&pasemi_smb_driver); | |
420 | } | |
421 | ||
422 | static void __exit pasemi_smb_exit(void) | |
423 | { | |
424 | pci_unregister_driver(&pasemi_smb_driver); | |
425 | } | |
426 | ||
427 | MODULE_LICENSE("GPL"); | |
428 | MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>"); | |
429 | MODULE_DESCRIPTION("PA Semi PWRficient SMBus driver"); | |
430 | ||
431 | module_init(pasemi_smb_init); | |
432 | module_exit(pasemi_smb_exit); |