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i5k_amb.c
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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 <[email protected]>
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/hwmon.h>
25 #include <linux/hwmon-sysfs.h>
26 #include <linux/err.h>
27 #include <linux/mutex.h>
28 #include <linux/log2.h>
29 #include <linux/pci.h>
30 #include <linux/platform_device.h>
31 #include <linux/slab.h>
32 
33 #define DRVNAME "i5k_amb"
34 
35 #define I5K_REG_AMB_BASE_ADDR 0x48
36 #define I5K_REG_AMB_LEN_ADDR 0x50
37 #define I5K_REG_CHAN0_PRESENCE_ADDR 0x64
38 #define I5K_REG_CHAN1_PRESENCE_ADDR 0x66
39 
40 #define AMB_REG_TEMP_MIN_ADDR 0x80
41 #define AMB_REG_TEMP_MID_ADDR 0x81
42 #define AMB_REG_TEMP_MAX_ADDR 0x82
43 #define AMB_REG_TEMP_STATUS_ADDR 0x84
44 #define AMB_REG_TEMP_ADDR 0x85
45 
46 #define AMB_CONFIG_SIZE 2048
47 #define AMB_FUNC_3_OFFSET 768
48 
49 static unsigned long amb_reg_temp_status(unsigned int amb)
50 {
51  return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR +
52  AMB_CONFIG_SIZE * amb;
53 }
54 
55 static unsigned long amb_reg_temp_min(unsigned int amb)
56 {
57  return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR +
58  AMB_CONFIG_SIZE * amb;
59 }
60 
61 static unsigned long amb_reg_temp_mid(unsigned int amb)
62 {
63  return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR +
64  AMB_CONFIG_SIZE * amb;
65 }
66 
67 static unsigned long amb_reg_temp_max(unsigned int amb)
68 {
69  return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR +
70  AMB_CONFIG_SIZE * amb;
71 }
72 
73 static unsigned long amb_reg_temp(unsigned int amb)
74 {
75  return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR +
76  AMB_CONFIG_SIZE * amb;
77 }
78 
79 #define MAX_MEM_CHANNELS 4
80 #define MAX_AMBS_PER_CHANNEL 16
81 #define MAX_AMBS (MAX_MEM_CHANNELS * \
82  MAX_AMBS_PER_CHANNEL)
83 #define CHANNEL_SHIFT 4
84 #define DIMM_MASK 0xF
85 /*
86  * Ugly hack: For some reason the highest bit is set if there
87  * are _any_ DIMMs in the channel. Attempting to read from
88  * this "high-order" AMB results in a memory bus error, so
89  * for now we'll just ignore that top bit, even though that
90  * might prevent us from seeing the 16th DIMM in the channel.
91  */
92 #define REAL_MAX_AMBS_PER_CHANNEL 15
93 #define KNOBS_PER_AMB 6
94 
95 static unsigned long amb_num_from_reg(unsigned int byte_num, unsigned int bit)
96 {
97  return byte_num * MAX_AMBS_PER_CHANNEL + bit;
98 }
99 
100 #define AMB_SYSFS_NAME_LEN 16
101 struct i5k_device_attribute {
102  struct sensor_device_attribute s_attr;
103  char name[AMB_SYSFS_NAME_LEN];
104 };
105 
106 struct i5k_amb_data {
107  struct device *hwmon_dev;
108 
109  unsigned long amb_base;
110  unsigned long amb_len;
111  u16 amb_present[MAX_MEM_CHANNELS];
112  void __iomem *amb_mmio;
113  struct i5k_device_attribute *attrs;
114  unsigned int num_attrs;
115 };
116 
117 static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
118  char *buf)
119 {
120  return sprintf(buf, "%s\n", DRVNAME);
121 }
122 
123 
124 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
125 
126 static struct platform_device *amb_pdev;
127 
128 static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset)
129 {
130  return ioread8(data->amb_mmio + offset);
131 }
132 
133 static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset,
134  u8 val)
135 {
136  iowrite8(val, data->amb_mmio + offset);
137 }
138 
139 static ssize_t show_amb_alarm(struct device *dev,
140  struct device_attribute *devattr,
141  char *buf)
142 {
143  struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
144  struct i5k_amb_data *data = dev_get_drvdata(dev);
145 
146  if (!(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x20) &&
147  (amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x8))
148  return sprintf(buf, "1\n");
149  else
150  return sprintf(buf, "0\n");
151 }
152 
153 static ssize_t store_amb_min(struct device *dev,
154  struct device_attribute *devattr,
155  const char *buf,
156  size_t count)
157 {
158  struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
159  struct i5k_amb_data *data = dev_get_drvdata(dev);
160  unsigned long temp;
161  int ret = kstrtoul(buf, 10, &temp);
162  if (ret < 0)
163  return ret;
164 
165  temp = temp / 500;
166  if (temp > 255)
167  temp = 255;
168 
169  amb_write_byte(data, amb_reg_temp_min(attr->index), temp);
170  return count;
171 }
172 
173 static ssize_t store_amb_mid(struct device *dev,
174  struct device_attribute *devattr,
175  const char *buf,
176  size_t count)
177 {
178  struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
179  struct i5k_amb_data *data = dev_get_drvdata(dev);
180  unsigned long temp;
181  int ret = kstrtoul(buf, 10, &temp);
182  if (ret < 0)
183  return ret;
184 
185  temp = temp / 500;
186  if (temp > 255)
187  temp = 255;
188 
189  amb_write_byte(data, amb_reg_temp_mid(attr->index), temp);
190  return count;
191 }
192 
193 static ssize_t store_amb_max(struct device *dev,
194  struct device_attribute *devattr,
195  const char *buf,
196  size_t count)
197 {
198  struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
199  struct i5k_amb_data *data = dev_get_drvdata(dev);
200  unsigned long temp;
201  int ret = kstrtoul(buf, 10, &temp);
202  if (ret < 0)
203  return ret;
204 
205  temp = temp / 500;
206  if (temp > 255)
207  temp = 255;
208 
209  amb_write_byte(data, amb_reg_temp_max(attr->index), temp);
210  return count;
211 }
212 
213 static ssize_t show_amb_min(struct device *dev,
214  struct device_attribute *devattr,
215  char *buf)
216 {
217  struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
218  struct i5k_amb_data *data = dev_get_drvdata(dev);
219  return sprintf(buf, "%d\n",
220  500 * amb_read_byte(data, amb_reg_temp_min(attr->index)));
221 }
222 
223 static ssize_t show_amb_mid(struct device *dev,
224  struct device_attribute *devattr,
225  char *buf)
226 {
227  struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
228  struct i5k_amb_data *data = dev_get_drvdata(dev);
229  return sprintf(buf, "%d\n",
230  500 * amb_read_byte(data, amb_reg_temp_mid(attr->index)));
231 }
232 
233 static ssize_t show_amb_max(struct device *dev,
234  struct device_attribute *devattr,
235  char *buf)
236 {
237  struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
238  struct i5k_amb_data *data = dev_get_drvdata(dev);
239  return sprintf(buf, "%d\n",
240  500 * amb_read_byte(data, amb_reg_temp_max(attr->index)));
241 }
242 
243 static ssize_t show_amb_temp(struct device *dev,
244  struct device_attribute *devattr,
245  char *buf)
246 {
247  struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
248  struct i5k_amb_data *data = dev_get_drvdata(dev);
249  return sprintf(buf, "%d\n",
250  500 * amb_read_byte(data, amb_reg_temp(attr->index)));
251 }
252 
253 static ssize_t show_label(struct device *dev,
254  struct device_attribute *devattr,
255  char *buf)
256 {
257  struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
258 
259  return sprintf(buf, "Ch. %d DIMM %d\n", attr->index >> CHANNEL_SHIFT,
260  attr->index & DIMM_MASK);
261 }
262 
263 static int __devinit i5k_amb_hwmon_init(struct platform_device *pdev)
264 {
265  int i, j, k, d = 0;
266  u16 c;
267  int res = 0;
268  int num_ambs = 0;
269  struct i5k_amb_data *data = platform_get_drvdata(pdev);
270 
271  /* Count the number of AMBs found */
272  /* ignore the high-order bit, see "Ugly hack" comment above */
273  for (i = 0; i < MAX_MEM_CHANNELS; i++)
274  num_ambs += hweight16(data->amb_present[i] & 0x7fff);
275 
276  /* Set up sysfs stuff */
277  data->attrs = kzalloc(sizeof(*data->attrs) * num_ambs * KNOBS_PER_AMB,
278  GFP_KERNEL);
279  if (!data->attrs)
280  return -ENOMEM;
281  data->num_attrs = 0;
282 
283  for (i = 0; i < MAX_MEM_CHANNELS; i++) {
284  c = data->amb_present[i];
285  for (j = 0; j < REAL_MAX_AMBS_PER_CHANNEL; j++, c >>= 1) {
286  struct i5k_device_attribute *iattr;
287 
288  k = amb_num_from_reg(i, j);
289  if (!(c & 0x1))
290  continue;
291  d++;
292 
293  /* sysfs label */
294  iattr = data->attrs + data->num_attrs;
295  snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
296  "temp%d_label", d);
297  iattr->s_attr.dev_attr.attr.name = iattr->name;
298  iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
299  iattr->s_attr.dev_attr.show = show_label;
300  iattr->s_attr.index = k;
301  sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
302  res = device_create_file(&pdev->dev,
303  &iattr->s_attr.dev_attr);
304  if (res)
305  goto exit_remove;
306  data->num_attrs++;
307 
308  /* Temperature sysfs knob */
309  iattr = data->attrs + data->num_attrs;
310  snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
311  "temp%d_input", d);
312  iattr->s_attr.dev_attr.attr.name = iattr->name;
313  iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
314  iattr->s_attr.dev_attr.show = show_amb_temp;
315  iattr->s_attr.index = k;
316  sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
317  res = device_create_file(&pdev->dev,
318  &iattr->s_attr.dev_attr);
319  if (res)
320  goto exit_remove;
321  data->num_attrs++;
322 
323  /* Temperature min sysfs knob */
324  iattr = data->attrs + data->num_attrs;
325  snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
326  "temp%d_min", d);
327  iattr->s_attr.dev_attr.attr.name = iattr->name;
328  iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
329  iattr->s_attr.dev_attr.show = show_amb_min;
330  iattr->s_attr.dev_attr.store = store_amb_min;
331  iattr->s_attr.index = k;
332  sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
333  res = device_create_file(&pdev->dev,
334  &iattr->s_attr.dev_attr);
335  if (res)
336  goto exit_remove;
337  data->num_attrs++;
338 
339  /* Temperature mid sysfs knob */
340  iattr = data->attrs + data->num_attrs;
341  snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
342  "temp%d_mid", d);
343  iattr->s_attr.dev_attr.attr.name = iattr->name;
344  iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
345  iattr->s_attr.dev_attr.show = show_amb_mid;
346  iattr->s_attr.dev_attr.store = store_amb_mid;
347  iattr->s_attr.index = k;
348  sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
349  res = device_create_file(&pdev->dev,
350  &iattr->s_attr.dev_attr);
351  if (res)
352  goto exit_remove;
353  data->num_attrs++;
354 
355  /* Temperature max sysfs knob */
356  iattr = data->attrs + data->num_attrs;
357  snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
358  "temp%d_max", d);
359  iattr->s_attr.dev_attr.attr.name = iattr->name;
360  iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
361  iattr->s_attr.dev_attr.show = show_amb_max;
362  iattr->s_attr.dev_attr.store = store_amb_max;
363  iattr->s_attr.index = k;
364  sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
365  res = device_create_file(&pdev->dev,
366  &iattr->s_attr.dev_attr);
367  if (res)
368  goto exit_remove;
369  data->num_attrs++;
370 
371  /* Temperature alarm sysfs knob */
372  iattr = data->attrs + data->num_attrs;
373  snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
374  "temp%d_alarm", d);
375  iattr->s_attr.dev_attr.attr.name = iattr->name;
376  iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
377  iattr->s_attr.dev_attr.show = show_amb_alarm;
378  iattr->s_attr.index = k;
379  sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
380  res = device_create_file(&pdev->dev,
381  &iattr->s_attr.dev_attr);
382  if (res)
383  goto exit_remove;
384  data->num_attrs++;
385  }
386  }
387 
388  res = device_create_file(&pdev->dev, &dev_attr_name);
389  if (res)
390  goto exit_remove;
391 
392  data->hwmon_dev = hwmon_device_register(&pdev->dev);
393  if (IS_ERR(data->hwmon_dev)) {
394  res = PTR_ERR(data->hwmon_dev);
395  goto exit_remove;
396  }
397 
398  return res;
399 
400 exit_remove:
401  device_remove_file(&pdev->dev, &dev_attr_name);
402  for (i = 0; i < data->num_attrs; i++)
403  device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
404  kfree(data->attrs);
405 
406  return res;
407 }
408 
409 static int __devinit i5k_amb_add(void)
410 {
411  int res = -ENODEV;
412 
413  /* only ever going to be one of these */
414  amb_pdev = platform_device_alloc(DRVNAME, 0);
415  if (!amb_pdev)
416  return -ENOMEM;
417 
418  res = platform_device_add(amb_pdev);
419  if (res)
420  goto err;
421  return 0;
422 
423 err:
424  platform_device_put(amb_pdev);
425  return res;
426 }
427 
428 static int __devinit i5k_find_amb_registers(struct i5k_amb_data *data,
429  unsigned long devid)
430 {
431  struct pci_dev *pcidev;
432  u32 val32;
433  int res = -ENODEV;
434 
435  /* Find AMB register memory space */
436  pcidev = pci_get_device(PCI_VENDOR_ID_INTEL,
437  devid,
438  NULL);
439  if (!pcidev)
440  return -ENODEV;
441 
442  if (pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32))
443  goto out;
444  data->amb_base = val32;
445 
446  if (pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32))
447  goto out;
448  data->amb_len = val32;
449 
450  /* Is it big enough? */
451  if (data->amb_len < AMB_CONFIG_SIZE * MAX_AMBS) {
452  dev_err(&pcidev->dev, "AMB region too small!\n");
453  goto out;
454  }
455 
456  res = 0;
457 out:
458  pci_dev_put(pcidev);
459  return res;
460 }
461 
462 static int __devinit i5k_channel_probe(u16 *amb_present, unsigned long dev_id)
463 {
464  struct pci_dev *pcidev;
465  u16 val16;
466  int res = -ENODEV;
467 
468  /* Copy the DIMM presence map for these two channels */
469  pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, dev_id, NULL);
470  if (!pcidev)
471  return -ENODEV;
472 
473  if (pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16))
474  goto out;
475  amb_present[0] = val16;
476 
477  if (pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16))
478  goto out;
479  amb_present[1] = val16;
480 
481  res = 0;
482 
483 out:
484  pci_dev_put(pcidev);
485  return res;
486 }
487 
488 static struct {
489  unsigned long err;
490  unsigned long fbd0;
491 } chipset_ids[] __devinitdata = {
492  { PCI_DEVICE_ID_INTEL_5000_ERR, PCI_DEVICE_ID_INTEL_5000_FBD0 },
493  { PCI_DEVICE_ID_INTEL_5400_ERR, PCI_DEVICE_ID_INTEL_5400_FBD0 },
494  { 0, 0 }
495 };
496 
497 #ifdef MODULE
498 static struct pci_device_id i5k_amb_ids[] __devinitdata = {
499  { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5000_ERR) },
500  { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5400_ERR) },
501  { 0, }
502 };
503 MODULE_DEVICE_TABLE(pci, i5k_amb_ids);
504 #endif
505 
506 static int __devinit i5k_amb_probe(struct platform_device *pdev)
507 {
508  struct i5k_amb_data *data;
509  struct resource *reso;
510  int i, res;
511 
512  data = kzalloc(sizeof(*data), GFP_KERNEL);
513  if (!data)
514  return -ENOMEM;
515 
516  /* Figure out where the AMB registers live */
517  i = 0;
518  do {
519  res = i5k_find_amb_registers(data, chipset_ids[i].err);
520  if (res == 0)
521  break;
522  i++;
523  } while (chipset_ids[i].err);
524 
525  if (res)
526  goto err;
527 
528  /* Copy the DIMM presence map for the first two channels */
529  res = i5k_channel_probe(&data->amb_present[0], chipset_ids[i].fbd0);
530  if (res)
531  goto err;
532 
533  /* Copy the DIMM presence map for the optional second two channels */
534  i5k_channel_probe(&data->amb_present[2], chipset_ids[i].fbd0 + 1);
535 
536  /* Set up resource regions */
537  reso = request_mem_region(data->amb_base, data->amb_len, DRVNAME);
538  if (!reso) {
539  res = -EBUSY;
540  goto err;
541  }
542 
543  data->amb_mmio = ioremap_nocache(data->amb_base, data->amb_len);
544  if (!data->amb_mmio) {
545  res = -EBUSY;
546  goto err_map_failed;
547  }
548 
549  platform_set_drvdata(pdev, data);
550 
551  res = i5k_amb_hwmon_init(pdev);
552  if (res)
553  goto err_init_failed;
554 
555  return res;
556 
557 err_init_failed:
558  iounmap(data->amb_mmio);
559  platform_set_drvdata(pdev, NULL);
560 err_map_failed:
561  release_mem_region(data->amb_base, data->amb_len);
562 err:
563  kfree(data);
564  return res;
565 }
566 
567 static int __devexit i5k_amb_remove(struct platform_device *pdev)
568 {
569  int i;
570  struct i5k_amb_data *data = platform_get_drvdata(pdev);
571 
572  hwmon_device_unregister(data->hwmon_dev);
573  device_remove_file(&pdev->dev, &dev_attr_name);
574  for (i = 0; i < data->num_attrs; i++)
575  device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
576  kfree(data->attrs);
577  iounmap(data->amb_mmio);
578  release_mem_region(data->amb_base, data->amb_len);
579  platform_set_drvdata(pdev, NULL);
580  kfree(data);
581  return 0;
582 }
583 
584 static struct platform_driver i5k_amb_driver = {
585  .driver = {
586  .owner = THIS_MODULE,
587  .name = DRVNAME,
588  },
589  .probe = i5k_amb_probe,
590  .remove = __devexit_p(i5k_amb_remove),
591 };
592 
593 static int __init i5k_amb_init(void)
594 {
595  int res;
596 
597  res = platform_driver_register(&i5k_amb_driver);
598  if (res)
599  return res;
600 
601  res = i5k_amb_add();
602  if (res)
603  platform_driver_unregister(&i5k_amb_driver);
604 
605  return res;
606 }
607 
608 static void __exit i5k_amb_exit(void)
609 {
610  platform_device_unregister(amb_pdev);
611  platform_driver_unregister(&i5k_amb_driver);
612 }
613 
614 MODULE_AUTHOR("Darrick J. Wong <[email protected]>");
615 MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor");
616 MODULE_LICENSE("GPL");
617 
618 module_init(i5k_amb_init);
619 module_exit(i5k_amb_exit);
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