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adfs: work around bogus sparse warning
[linux-2.6/openmoko-kernel/knife-kernel.git] / drivers / hwmon / i5k_amb.c
blob6ac5c6f53585cf8df96a1b2786abfceac1b6f5b8
1 /*
2 * A hwmon driver for the Intel 5000 series chipset FB-DIMM AMB
3 * temperature sensors
4 * Copyright (C) 2007 IBM
5 *
6 * Author: Darrick J. Wong <djwong@us.ibm.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23 #include <linux/module.h>
24 #include <linux/jiffies.h>
25 #include <linux/hwmon.h>
26 #include <linux/hwmon-sysfs.h>
27 #include <linux/err.h>
28 #include <linux/mutex.h>
29 #include <linux/delay.h>
30 #include <linux/log2.h>
31 #include <linux/pci.h>
32 #include <linux/platform_device.h>
33
34 #define DRVNAME "i5k_amb"
35
36 #define I5K_REG_AMB_BASE_ADDR 0x48
37 #define I5K_REG_AMB_LEN_ADDR 0x50
38 #define I5K_REG_CHAN0_PRESENCE_ADDR 0x64
39 #define I5K_REG_CHAN1_PRESENCE_ADDR 0x66
40
41 #define AMB_REG_TEMP_MIN_ADDR 0x80
42 #define AMB_REG_TEMP_MID_ADDR 0x81
43 #define AMB_REG_TEMP_MAX_ADDR 0x82
44 #define AMB_REG_TEMP_STATUS_ADDR 0x84
45 #define AMB_REG_TEMP_ADDR 0x85
46
47 #define AMB_CONFIG_SIZE 2048
48 #define AMB_FUNC_3_OFFSET 768
49
50 static unsigned long amb_reg_temp_status(unsigned int amb)
51 {
52 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR +
53 AMB_CONFIG_SIZE * amb;
54 }
55
56 static unsigned long amb_reg_temp_min(unsigned int amb)
57 {
58 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR +
59 AMB_CONFIG_SIZE * amb;
60 }
61
62 static unsigned long amb_reg_temp_mid(unsigned int amb)
63 {
64 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR +
65 AMB_CONFIG_SIZE * amb;
66 }
67
68 static unsigned long amb_reg_temp_max(unsigned int amb)
69 {
70 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR +
71 AMB_CONFIG_SIZE * amb;
72 }
73
74 static unsigned long amb_reg_temp(unsigned int amb)
75 {
76 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR +
77 AMB_CONFIG_SIZE * amb;
78 }
79
80 #define MAX_MEM_CHANNELS 4
81 #define MAX_AMBS_PER_CHANNEL 16
82 #define MAX_AMBS (MAX_MEM_CHANNELS * \
83 MAX_AMBS_PER_CHANNEL)
84 /*
85 * Ugly hack: For some reason the highest bit is set if there
86 * are _any_ DIMMs in the channel. Attempting to read from
87 * this "high-order" AMB results in a memory bus error, so
88 * for now we'll just ignore that top bit, even though that
89 * might prevent us from seeing the 16th DIMM in the channel.
90 */
91 #define REAL_MAX_AMBS_PER_CHANNEL 15
92 #define KNOBS_PER_AMB 5
93
94 static unsigned long amb_num_from_reg(unsigned int byte_num, unsigned int bit)
95 {
96 return byte_num * MAX_AMBS_PER_CHANNEL + bit;
97 }
98
99 #define AMB_SYSFS_NAME_LEN 16
100 struct i5k_device_attribute {
101 struct sensor_device_attribute s_attr;
102 char name[AMB_SYSFS_NAME_LEN];
103 };
104
105 struct i5k_amb_data {
106 struct device *hwmon_dev;
107
108 unsigned long amb_base;
109 unsigned long amb_len;
110 u16 amb_present[MAX_MEM_CHANNELS];
111 void __iomem *amb_mmio;
112 struct i5k_device_attribute *attrs;
113 unsigned int num_attrs;
114 };
115
116 static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
117 char *buf)
118 {
119 return sprintf(buf, "%s\n", DRVNAME);
120 }
121
122
123 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
124
125 static struct platform_device *amb_pdev;
126
127 static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset)
128 {
129 return ioread8(data->amb_mmio + offset);
130 }
131
132 static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset,
133 u8 val)
134 {
135 iowrite8(val, data->amb_mmio + offset);
136 }
137
138 static ssize_t show_amb_alarm(struct device *dev,
139 struct device_attribute *devattr,
140 char *buf)
141 {
142 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
143 struct i5k_amb_data *data = dev_get_drvdata(dev);
144
145 if (!(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x20) &&
146 (amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x8))
147 return sprintf(buf, "1\n");
148 else
149 return sprintf(buf, "0\n");
150 }
151
152 static ssize_t store_amb_min(struct device *dev,
153 struct device_attribute *devattr,
154 const char *buf,
155 size_t count)
156 {
157 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
158 struct i5k_amb_data *data = dev_get_drvdata(dev);
159 unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;
160
161 if (temp > 255)
162 temp = 255;
163
164 amb_write_byte(data, amb_reg_temp_min(attr->index), temp);
165 return count;
166 }
167
168 static ssize_t store_amb_mid(struct device *dev,
169 struct device_attribute *devattr,
170 const char *buf,
171 size_t count)
172 {
173 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
174 struct i5k_amb_data *data = dev_get_drvdata(dev);
175 unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;
176
177 if (temp > 255)
178 temp = 255;
179
180 amb_write_byte(data, amb_reg_temp_mid(attr->index), temp);
181 return count;
182 }
183
184 static ssize_t store_amb_max(struct device *dev,
185 struct device_attribute *devattr,
186 const char *buf,
187 size_t count)
188 {
189 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
190 struct i5k_amb_data *data = dev_get_drvdata(dev);
191 unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;
192
193 if (temp > 255)
194 temp = 255;
195
196 amb_write_byte(data, amb_reg_temp_max(attr->index), temp);
197 return count;
198 }
199
200 static ssize_t show_amb_min(struct device *dev,
201 struct device_attribute *devattr,
202 char *buf)
203 {
204 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
205 struct i5k_amb_data *data = dev_get_drvdata(dev);
206 return sprintf(buf, "%d\n",
207 500 * amb_read_byte(data, amb_reg_temp_min(attr->index)));
208 }
209
210 static ssize_t show_amb_mid(struct device *dev,
211 struct device_attribute *devattr,
212 char *buf)
213 {
214 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
215 struct i5k_amb_data *data = dev_get_drvdata(dev);
216 return sprintf(buf, "%d\n",
217 500 * amb_read_byte(data, amb_reg_temp_mid(attr->index)));
218 }
219
220 static ssize_t show_amb_max(struct device *dev,
221 struct device_attribute *devattr,
222 char *buf)
223 {
224 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
225 struct i5k_amb_data *data = dev_get_drvdata(dev);
226 return sprintf(buf, "%d\n",
227 500 * amb_read_byte(data, amb_reg_temp_max(attr->index)));
228 }
229
230 static ssize_t show_amb_temp(struct device *dev,
231 struct device_attribute *devattr,
232 char *buf)
233 {
234 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
235 struct i5k_amb_data *data = dev_get_drvdata(dev);
236 return sprintf(buf, "%d\n",
237 500 * amb_read_byte(data, amb_reg_temp(attr->index)));
238 }
239
240 static int __devinit i5k_amb_hwmon_init(struct platform_device *pdev)
241 {
242 int i, j, k, d = 0;
243 u16 c;
244 int res = 0;
245 int num_ambs = 0;
246 struct i5k_amb_data *data = platform_get_drvdata(pdev);
247
248 /* Count the number of AMBs found */
249 /* ignore the high-order bit, see "Ugly hack" comment above */
250 for (i = 0; i < MAX_MEM_CHANNELS; i++)
251 num_ambs += hweight16(data->amb_present[i] & 0x7fff);
252
253 /* Set up sysfs stuff */
254 data->attrs = kzalloc(sizeof(*data->attrs) * num_ambs * KNOBS_PER_AMB,
255 GFP_KERNEL);
256 if (!data->attrs)
257 return -ENOMEM;
258 data->num_attrs = 0;
259
260 for (i = 0; i < MAX_MEM_CHANNELS; i++) {
261 c = data->amb_present[i];
262 for (j = 0; j < REAL_MAX_AMBS_PER_CHANNEL; j++, c >>= 1) {
263 struct i5k_device_attribute *iattr;
264
265 k = amb_num_from_reg(i, j);
266 if (!(c & 0x1))
267 continue;
268 d++;
269
270 /* Temperature sysfs knob */
271 iattr = data->attrs + data->num_attrs;
272 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
273 "temp%d_input", d);
274 iattr->s_attr.dev_attr.attr.name = iattr->name;
275 iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
276 iattr->s_attr.dev_attr.show = show_amb_temp;
277 iattr->s_attr.index = k;
278 res = device_create_file(&pdev->dev,
279 &iattr->s_attr.dev_attr);
280 if (res)
281 goto exit_remove;
282 data->num_attrs++;
283
284 /* Temperature min sysfs knob */
285 iattr = data->attrs + data->num_attrs;
286 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
287 "temp%d_min", d);
288 iattr->s_attr.dev_attr.attr.name = iattr->name;
289 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
290 iattr->s_attr.dev_attr.show = show_amb_min;
291 iattr->s_attr.dev_attr.store = store_amb_min;
292 iattr->s_attr.index = k;
293 res = device_create_file(&pdev->dev,
294 &iattr->s_attr.dev_attr);
295 if (res)
296 goto exit_remove;
297 data->num_attrs++;
298
299 /* Temperature mid sysfs knob */
300 iattr = data->attrs + data->num_attrs;
301 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
302 "temp%d_mid", d);
303 iattr->s_attr.dev_attr.attr.name = iattr->name;
304 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
305 iattr->s_attr.dev_attr.show = show_amb_mid;
306 iattr->s_attr.dev_attr.store = store_amb_mid;
307 iattr->s_attr.index = k;
308 res = device_create_file(&pdev->dev,
309 &iattr->s_attr.dev_attr);
310 if (res)
311 goto exit_remove;
312 data->num_attrs++;
313
314 /* Temperature max sysfs knob */
315 iattr = data->attrs + data->num_attrs;
316 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
317 "temp%d_max", d);
318 iattr->s_attr.dev_attr.attr.name = iattr->name;
319 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
320 iattr->s_attr.dev_attr.show = show_amb_max;
321 iattr->s_attr.dev_attr.store = store_amb_max;
322 iattr->s_attr.index = k;
323 res = device_create_file(&pdev->dev,
324 &iattr->s_attr.dev_attr);
325 if (res)
326 goto exit_remove;
327 data->num_attrs++;
328
329 /* Temperature alarm sysfs knob */
330 iattr = data->attrs + data->num_attrs;
331 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
332 "temp%d_alarm", d);
333 iattr->s_attr.dev_attr.attr.name = iattr->name;
334 iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
335 iattr->s_attr.dev_attr.show = show_amb_alarm;
336 iattr->s_attr.index = k;
337 res = device_create_file(&pdev->dev,
338 &iattr->s_attr.dev_attr);
339 if (res)
340 goto exit_remove;
341 data->num_attrs++;
342 }
343 }
344
345 res = device_create_file(&pdev->dev, &dev_attr_name);
346 if (res)
347 goto exit_remove;
348
349 data->hwmon_dev = hwmon_device_register(&pdev->dev);
350 if (IS_ERR(data->hwmon_dev)) {
351 res = PTR_ERR(data->hwmon_dev);
352 goto exit_remove;
353 }
354
355 return res;
356
357 exit_remove:
358 device_remove_file(&pdev->dev, &dev_attr_name);
359 for (i = 0; i < data->num_attrs; i++)
360 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
361 kfree(data->attrs);
362
363 return res;
364 }
365
366 static int __devinit i5k_amb_add(void)
367 {
368 int res = -ENODEV;
369
370 /* only ever going to be one of these */
371 amb_pdev = platform_device_alloc(DRVNAME, 0);
372 if (!amb_pdev)
373 return -ENOMEM;
374
375 res = platform_device_add(amb_pdev);
376 if (res)
377 goto err;
378 return 0;
379
380 err:
381 platform_device_put(amb_pdev);
382 return res;
383 }
384
385 static int __devinit i5k_find_amb_registers(struct i5k_amb_data *data)
386 {
387 struct pci_dev *pcidev;
388 u32 val32;
389 int res = -ENODEV;
390
391 /* Find AMB register memory space */
392 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL,
393 PCI_DEVICE_ID_INTEL_5000_ERR,
394 NULL);
395 if (!pcidev)
396 return -ENODEV;
397
398 if (pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32))
399 goto out;
400 data->amb_base = val32;
401
402 if (pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32))
403 goto out;
404 data->amb_len = val32;
405
406 /* Is it big enough? */
407 if (data->amb_len < AMB_CONFIG_SIZE * MAX_AMBS) {
408 dev_err(&pcidev->dev, "AMB region too small!\n");
409 goto out;
410 }
411
412 res = 0;
413 out:
414 pci_dev_put(pcidev);
415 return res;
416 }
417
418 static int __devinit i5k_channel_probe(u16 *amb_present, unsigned long dev_id)
419 {
420 struct pci_dev *pcidev;
421 u16 val16;
422 int res = -ENODEV;
423
424 /* Copy the DIMM presence map for these two channels */
425 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, dev_id, NULL);
426 if (!pcidev)
427 return -ENODEV;
428
429 if (pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16))
430 goto out;
431 amb_present[0] = val16;
432
433 if (pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16))
434 goto out;
435 amb_present[1] = val16;
436
437 res = 0;
438
439 out:
440 pci_dev_put(pcidev);
441 return res;
442 }
443
444 static int __devinit i5k_amb_probe(struct platform_device *pdev)
445 {
446 struct i5k_amb_data *data;
447 struct resource *reso;
448 int res = -ENODEV;
449
450 data = kzalloc(sizeof(*data), GFP_KERNEL);
451 if (!data)
452 return -ENOMEM;
453
454 /* Figure out where the AMB registers live */
455 res = i5k_find_amb_registers(data);
456 if (res)
457 goto err;
458
459 /* Copy the DIMM presence map for the first two channels */
460 res = i5k_channel_probe(&data->amb_present[0],
461 PCI_DEVICE_ID_INTEL_5000_FBD0);
462 if (res)
463 goto err;
464
465 /* Copy the DIMM presence map for the optional second two channels */
466 i5k_channel_probe(&data->amb_present[2],
467 PCI_DEVICE_ID_INTEL_5000_FBD1);
468
469 /* Set up resource regions */
470 reso = request_mem_region(data->amb_base, data->amb_len, DRVNAME);
471 if (!reso) {
472 res = -EBUSY;
473 goto err;
474 }
475
476 data->amb_mmio = ioremap_nocache(data->amb_base, data->amb_len);
477 if (!data->amb_mmio) {
478 res = -EBUSY;
479 goto err_map_failed;
480 }
481
482 platform_set_drvdata(pdev, data);
483
484 res = i5k_amb_hwmon_init(pdev);
485 if (res)
486 goto err_init_failed;
487
488 return res;
489
490 err_init_failed:
491 iounmap(data->amb_mmio);
492 platform_set_drvdata(pdev, NULL);
493 err_map_failed:
494 release_mem_region(data->amb_base, data->amb_len);
495 err:
496 kfree(data);
497 return res;
498 }
499
500 static int __devexit i5k_amb_remove(struct platform_device *pdev)
501 {
502 int i;
503 struct i5k_amb_data *data = platform_get_drvdata(pdev);
504
505 hwmon_device_unregister(data->hwmon_dev);
506 device_remove_file(&pdev->dev, &dev_attr_name);
507 for (i = 0; i < data->num_attrs; i++)
508 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
509 kfree(data->attrs);
510 iounmap(data->amb_mmio);
511 release_mem_region(data->amb_base, data->amb_len);
512 platform_set_drvdata(pdev, NULL);
513 kfree(data);
514 return 0;
515 }
516
517 static struct platform_driver i5k_amb_driver = {
518 .driver = {
519 .owner = THIS_MODULE,
520 .name = DRVNAME,
521 },
522 .probe = i5k_amb_probe,
523 .remove = __devexit_p(i5k_amb_remove),
524 };
525
526 static int __init i5k_amb_init(void)
527 {
528 int res;
529
530 res = platform_driver_register(&i5k_amb_driver);
531 if (res)
532 return res;
533
534 res = i5k_amb_add();
535 if (res)
536 platform_driver_unregister(&i5k_amb_driver);
537
538 return res;
539 }
540
541 static void __exit i5k_amb_exit(void)
542 {
543 platform_device_unregister(amb_pdev);
544 platform_driver_unregister(&i5k_amb_driver);
545 }
546
547 MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
548 MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor");
549 MODULE_LICENSE("GPL");
550
551 module_init(i5k_amb_init);
552 module_exit(i5k_amb_exit);
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