tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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#include <linux/slab.h>
34
35#define DRVNAME "i5k_amb"
36
37#define I5K_REG_AMB_BASE_ADDR 0x48
38#define I5K_REG_AMB_LEN_ADDR 0x50
39#define I5K_REG_CHAN0_PRESENCE_ADDR 0x64
40#define I5K_REG_CHAN1_PRESENCE_ADDR 0x66
41
42#define AMB_REG_TEMP_MIN_ADDR 0x80
43#define AMB_REG_TEMP_MID_ADDR 0x81
44#define AMB_REG_TEMP_MAX_ADDR 0x82
45#define AMB_REG_TEMP_STATUS_ADDR 0x84
46#define AMB_REG_TEMP_ADDR 0x85
47
48#define AMB_CONFIG_SIZE 2048
49#define AMB_FUNC_3_OFFSET 768
50
51static unsigned long amb_reg_temp_status(unsigned int amb)
52{
53 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR +
54 AMB_CONFIG_SIZE * amb;
55}
56
57static unsigned long amb_reg_temp_min(unsigned int amb)
58{
59 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR +
60 AMB_CONFIG_SIZE * amb;
61}
62
63static unsigned long amb_reg_temp_mid(unsigned int amb)
64{
65 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR +
66 AMB_CONFIG_SIZE * amb;
67}
68
69static unsigned long amb_reg_temp_max(unsigned int amb)
70{
71 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR +
72 AMB_CONFIG_SIZE * amb;
73}
74
75static unsigned long amb_reg_temp(unsigned int amb)
76{
77 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR +
78 AMB_CONFIG_SIZE * amb;
79}
80
81#define MAX_MEM_CHANNELS 4
82#define MAX_AMBS_PER_CHANNEL 16
83#define MAX_AMBS (MAX_MEM_CHANNELS * \
84 MAX_AMBS_PER_CHANNEL)
85#define CHANNEL_SHIFT 4
86#define DIMM_MASK 0xF
87/*
88 * Ugly hack: For some reason the highest bit is set if there
89 * are _any_ DIMMs in the channel. Attempting to read from
90 * this "high-order" AMB results in a memory bus error, so
91 * for now we'll just ignore that top bit, even though that
92 * might prevent us from seeing the 16th DIMM in the channel.
93 */
94#define REAL_MAX_AMBS_PER_CHANNEL 15
95#define KNOBS_PER_AMB 6
96
97static unsigned long amb_num_from_reg(unsigned int byte_num, unsigned int bit)
98{
99 return byte_num * MAX_AMBS_PER_CHANNEL + bit;
100}
101
102#define AMB_SYSFS_NAME_LEN 16
103struct i5k_device_attribute {
104 struct sensor_device_attribute s_attr;
105 char name[AMB_SYSFS_NAME_LEN];
106};
107
108struct i5k_amb_data {
109 struct device *hwmon_dev;
110
111 unsigned long amb_base;
112 unsigned long amb_len;
113 u16 amb_present[MAX_MEM_CHANNELS];
114 void __iomem *amb_mmio;
115 struct i5k_device_attribute *attrs;
116 unsigned int num_attrs;
117};
118
119static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
120 char *buf)
121{
122 return sprintf(buf, "%s\n", DRVNAME);
123}
124
125
126static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
127
128static struct platform_device *amb_pdev;
129
130static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset)
131{
132 return ioread8(data->amb_mmio + offset);
133}
134
135static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset,
136 u8 val)
137{
138 iowrite8(val, data->amb_mmio + offset);
139}
140
141static ssize_t show_amb_alarm(struct device *dev,
142 struct device_attribute *devattr,
143 char *buf)
144{
145 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
146 struct i5k_amb_data *data = dev_get_drvdata(dev);
147
148 if (!(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x20) &&
149 (amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x8))
150 return sprintf(buf, "1\n");
151 else
152 return sprintf(buf, "0\n");
153}
154
155static ssize_t store_amb_min(struct device *dev,
156 struct device_attribute *devattr,
157 const char *buf,
158 size_t count)
159{
160 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
161 struct i5k_amb_data *data = dev_get_drvdata(dev);
162 unsigned long temp;
163 int ret = kstrtoul(buf, 10, &temp);
164 if (ret < 0)
165 return ret;
166
167 temp = temp / 500;
168 if (temp > 255)
169 temp = 255;
170
171 amb_write_byte(data, amb_reg_temp_min(attr->index), temp);
172 return count;
173}
174
175static ssize_t store_amb_mid(struct device *dev,
176 struct device_attribute *devattr,
177 const char *buf,
178 size_t count)
179{
180 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
181 struct i5k_amb_data *data = dev_get_drvdata(dev);
182 unsigned long temp;
183 int ret = kstrtoul(buf, 10, &temp);
184 if (ret < 0)
185 return ret;
186
187 temp = temp / 500;
188 if (temp > 255)
189 temp = 255;
190
191 amb_write_byte(data, amb_reg_temp_mid(attr->index), temp);
192 return count;
193}
194
195static ssize_t store_amb_max(struct device *dev,
196 struct device_attribute *devattr,
197 const char *buf,
198 size_t count)
199{
200 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
201 struct i5k_amb_data *data = dev_get_drvdata(dev);
202 unsigned long temp;
203 int ret = kstrtoul(buf, 10, &temp);
204 if (ret < 0)
205 return ret;
206
207 temp = temp / 500;
208 if (temp > 255)
209 temp = 255;
210
211 amb_write_byte(data, amb_reg_temp_max(attr->index), temp);
212 return count;
213}
214
215static ssize_t show_amb_min(struct device *dev,
216 struct device_attribute *devattr,
217 char *buf)
218{
219 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
220 struct i5k_amb_data *data = dev_get_drvdata(dev);
221 return sprintf(buf, "%d\n",
222 500 * amb_read_byte(data, amb_reg_temp_min(attr->index)));
223}
224
225static ssize_t show_amb_mid(struct device *dev,
226 struct device_attribute *devattr,
227 char *buf)
228{
229 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
230 struct i5k_amb_data *data = dev_get_drvdata(dev);
231 return sprintf(buf, "%d\n",
232 500 * amb_read_byte(data, amb_reg_temp_mid(attr->index)));
233}
234
235static ssize_t show_amb_max(struct device *dev,
236 struct device_attribute *devattr,
237 char *buf)
238{
239 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
240 struct i5k_amb_data *data = dev_get_drvdata(dev);
241 return sprintf(buf, "%d\n",
242 500 * amb_read_byte(data, amb_reg_temp_max(attr->index)));
243}
244
245static ssize_t show_amb_temp(struct device *dev,
246 struct device_attribute *devattr,
247 char *buf)
248{
249 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
250 struct i5k_amb_data *data = dev_get_drvdata(dev);
251 return sprintf(buf, "%d\n",
252 500 * amb_read_byte(data, amb_reg_temp(attr->index)));
253}
254
255static ssize_t show_label(struct device *dev,
256 struct device_attribute *devattr,
257 char *buf)
258{
259 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
260
261 return sprintf(buf, "Ch. %d DIMM %d\n", attr->index >> CHANNEL_SHIFT,
262 attr->index & DIMM_MASK);
263}
264
265static int __devinit i5k_amb_hwmon_init(struct platform_device *pdev)
266{
267 int i, j, k, d = 0;
268 u16 c;
269 int res = 0;
270 int num_ambs = 0;
271 struct i5k_amb_data *data = platform_get_drvdata(pdev);
272
273 /* Count the number of AMBs found */
274 /* ignore the high-order bit, see "Ugly hack" comment above */
275 for (i = 0; i < MAX_MEM_CHANNELS; i++)
276 num_ambs += hweight16(data->amb_present[i] & 0x7fff);
277
278 /* Set up sysfs stuff */
279 data->attrs = kzalloc(sizeof(*data->attrs) * num_ambs * KNOBS_PER_AMB,
280 GFP_KERNEL);
281 if (!data->attrs)
282 return -ENOMEM;
283 data->num_attrs = 0;
284
285 for (i = 0; i < MAX_MEM_CHANNELS; i++) {
286 c = data->amb_present[i];
287 for (j = 0; j < REAL_MAX_AMBS_PER_CHANNEL; j++, c >>= 1) {
288 struct i5k_device_attribute *iattr;
289
290 k = amb_num_from_reg(i, j);
291 if (!(c & 0x1))
292 continue;
293 d++;
294
295 /* sysfs label */
296 iattr = data->attrs + data->num_attrs;
297 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
298 "temp%d_label", d);
299 iattr->s_attr.dev_attr.attr.name = iattr->name;
300 iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
301 iattr->s_attr.dev_attr.show = show_label;
302 iattr->s_attr.index = k;
303 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
304 res = device_create_file(&pdev->dev,
305 &iattr->s_attr.dev_attr);
306 if (res)
307 goto exit_remove;
308 data->num_attrs++;
309
310 /* Temperature sysfs knob */
311 iattr = data->attrs + data->num_attrs;
312 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
313 "temp%d_input", d);
314 iattr->s_attr.dev_attr.attr.name = iattr->name;
315 iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
316 iattr->s_attr.dev_attr.show = show_amb_temp;
317 iattr->s_attr.index = k;
318 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
319 res = device_create_file(&pdev->dev,
320 &iattr->s_attr.dev_attr);
321 if (res)
322 goto exit_remove;
323 data->num_attrs++;
324
325 /* Temperature min sysfs knob */
326 iattr = data->attrs + data->num_attrs;
327 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
328 "temp%d_min", d);
329 iattr->s_attr.dev_attr.attr.name = iattr->name;
330 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
331 iattr->s_attr.dev_attr.show = show_amb_min;
332 iattr->s_attr.dev_attr.store = store_amb_min;
333 iattr->s_attr.index = k;
334 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
335 res = device_create_file(&pdev->dev,
336 &iattr->s_attr.dev_attr);
337 if (res)
338 goto exit_remove;
339 data->num_attrs++;
340
341 /* Temperature mid sysfs knob */
342 iattr = data->attrs + data->num_attrs;
343 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
344 "temp%d_mid", d);
345 iattr->s_attr.dev_attr.attr.name = iattr->name;
346 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
347 iattr->s_attr.dev_attr.show = show_amb_mid;
348 iattr->s_attr.dev_attr.store = store_amb_mid;
349 iattr->s_attr.index = k;
350 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
351 res = device_create_file(&pdev->dev,
352 &iattr->s_attr.dev_attr);
353 if (res)
354 goto exit_remove;
355 data->num_attrs++;
356
357 /* Temperature max sysfs knob */
358 iattr = data->attrs + data->num_attrs;
359 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
360 "temp%d_max", d);
361 iattr->s_attr.dev_attr.attr.name = iattr->name;
362 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
363 iattr->s_attr.dev_attr.show = show_amb_max;
364 iattr->s_attr.dev_attr.store = store_amb_max;
365 iattr->s_attr.index = k;
366 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
367 res = device_create_file(&pdev->dev,
368 &iattr->s_attr.dev_attr);
369 if (res)
370 goto exit_remove;
371 data->num_attrs++;
372
373 /* Temperature alarm sysfs knob */
374 iattr = data->attrs + data->num_attrs;
375 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
376 "temp%d_alarm", d);
377 iattr->s_attr.dev_attr.attr.name = iattr->name;
378 iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
379 iattr->s_attr.dev_attr.show = show_amb_alarm;
380 iattr->s_attr.index = k;
381 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
382 res = device_create_file(&pdev->dev,
383 &iattr->s_attr.dev_attr);
384 if (res)
385 goto exit_remove;
386 data->num_attrs++;
387 }
388 }
389
390 res = device_create_file(&pdev->dev, &dev_attr_name);
391 if (res)
392 goto exit_remove;
393
394 data->hwmon_dev = hwmon_device_register(&pdev->dev);
395 if (IS_ERR(data->hwmon_dev)) {
396 res = PTR_ERR(data->hwmon_dev);
397 goto exit_remove;
398 }
399
400 return res;
401
402exit_remove:
403 device_remove_file(&pdev->dev, &dev_attr_name);
404 for (i = 0; i < data->num_attrs; i++)
405 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
406 kfree(data->attrs);
407
408 return res;
409}
410
411static int __devinit i5k_amb_add(void)
412{
413 int res = -ENODEV;
414
415 /* only ever going to be one of these */
416 amb_pdev = platform_device_alloc(DRVNAME, 0);
417 if (!amb_pdev)
418 return -ENOMEM;
419
420 res = platform_device_add(amb_pdev);
421 if (res)
422 goto err;
423 return 0;
424
425err:
426 platform_device_put(amb_pdev);
427 return res;
428}
429
430static int __devinit i5k_find_amb_registers(struct i5k_amb_data *data,
431 unsigned long devid)
432{
433 struct pci_dev *pcidev;
434 u32 val32;
435 int res = -ENODEV;
436
437 /* Find AMB register memory space */
438 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL,
439 devid,
440 NULL);
441 if (!pcidev)
442 return -ENODEV;
443
444 if (pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32))
445 goto out;
446 data->amb_base = val32;
447
448 if (pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32))
449 goto out;
450 data->amb_len = val32;
451
452 /* Is it big enough? */
453 if (data->amb_len < AMB_CONFIG_SIZE * MAX_AMBS) {
454 dev_err(&pcidev->dev, "AMB region too small!\n");
455 goto out;
456 }
457
458 res = 0;
459out:
460 pci_dev_put(pcidev);
461 return res;
462}
463
464static int __devinit i5k_channel_probe(u16 *amb_present, unsigned long dev_id)
465{
466 struct pci_dev *pcidev;
467 u16 val16;
468 int res = -ENODEV;
469
470 /* Copy the DIMM presence map for these two channels */
471 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, dev_id, NULL);
472 if (!pcidev)
473 return -ENODEV;
474
475 if (pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16))
476 goto out;
477 amb_present[0] = val16;
478
479 if (pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16))
480 goto out;
481 amb_present[1] = val16;
482
483 res = 0;
484
485out:
486 pci_dev_put(pcidev);
487 return res;
488}
489
490static struct {
491 unsigned long err;
492 unsigned long fbd0;
493} chipset_ids[] __devinitdata = {
494 { PCI_DEVICE_ID_INTEL_5000_ERR, PCI_DEVICE_ID_INTEL_5000_FBD0 },
495 { PCI_DEVICE_ID_INTEL_5400_ERR, PCI_DEVICE_ID_INTEL_5400_FBD0 },
496 { 0, 0 }
497};
498
499#ifdef MODULE
500static struct pci_device_id i5k_amb_ids[] __devinitdata = {
501 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5000_ERR) },
502 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5400_ERR) },
503 { 0, }
504};
505MODULE_DEVICE_TABLE(pci, i5k_amb_ids);
506#endif
507
508static int __devinit i5k_amb_probe(struct platform_device *pdev)
509{
510 struct i5k_amb_data *data;
511 struct resource *reso;
512 int i, res;
513
514 data = kzalloc(sizeof(*data), GFP_KERNEL);
515 if (!data)
516 return -ENOMEM;
517
518 /* Figure out where the AMB registers live */
519 i = 0;
520 do {
521 res = i5k_find_amb_registers(data, chipset_ids[i].err);
522 if (res == 0)
523 break;
524 i++;
525 } while (chipset_ids[i].err);
526
527 if (res)
528 goto err;
529
530 /* Copy the DIMM presence map for the first two channels */
531 res = i5k_channel_probe(&data->amb_present[0], chipset_ids[i].fbd0);
532 if (res)
533 goto err;
534
535 /* Copy the DIMM presence map for the optional second two channels */
536 i5k_channel_probe(&data->amb_present[2], chipset_ids[i].fbd0 + 1);
537
538 /* Set up resource regions */
539 reso = request_mem_region(data->amb_base, data->amb_len, DRVNAME);
540 if (!reso) {
541 res = -EBUSY;
542 goto err;
543 }
544
545 data->amb_mmio = ioremap_nocache(data->amb_base, data->amb_len);
546 if (!data->amb_mmio) {
547 res = -EBUSY;
548 goto err_map_failed;
549 }
550
551 platform_set_drvdata(pdev, data);
552
553 res = i5k_amb_hwmon_init(pdev);
554 if (res)
555 goto err_init_failed;
556
557 return res;
558
559err_init_failed:
560 iounmap(data->amb_mmio);
561 platform_set_drvdata(pdev, NULL);
562err_map_failed:
563 release_mem_region(data->amb_base, data->amb_len);
564err:
565 kfree(data);
566 return res;
567}
568
569static int __devexit i5k_amb_remove(struct platform_device *pdev)
570{
571 int i;
572 struct i5k_amb_data *data = platform_get_drvdata(pdev);
573
574 hwmon_device_unregister(data->hwmon_dev);
575 device_remove_file(&pdev->dev, &dev_attr_name);
576 for (i = 0; i < data->num_attrs; i++)
577 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
578 kfree(data->attrs);
579 iounmap(data->amb_mmio);
580 release_mem_region(data->amb_base, data->amb_len);
581 platform_set_drvdata(pdev, NULL);
582 kfree(data);
583 return 0;
584}
585
586static struct platform_driver i5k_amb_driver = {
587 .driver = {
588 .owner = THIS_MODULE,
589 .name = DRVNAME,
590 },
591 .probe = i5k_amb_probe,
592 .remove = __devexit_p(i5k_amb_remove),
593};
594
595static int __init i5k_amb_init(void)
596{
597 int res;
598
599 res = platform_driver_register(&i5k_amb_driver);
600 if (res)
601 return res;
602
603 res = i5k_amb_add();
604 if (res)
605 platform_driver_unregister(&i5k_amb_driver);
606
607 return res;
608}
609
610static void __exit i5k_amb_exit(void)
611{
612 platform_device_unregister(amb_pdev);
613 platform_driver_unregister(&i5k_amb_driver);
614}
615
616MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
617MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor");
618MODULE_LICENSE("GPL");
619
620module_init(i5k_amb_init);
621module_exit(i5k_amb_exit);