Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/hwmon/i5k_amb.c

  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 <darrick.wong@oracle.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/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, "\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 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 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 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 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[]  = {
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[] = {
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 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 err_map_failed:
560         release_mem_region(data->amb_base, data->amb_len);
561 err:
562         kfree(data);
563         return res;
564 }
565 
566 static int i5k_amb_remove(struct platform_device *pdev)
567 {
568         int i;
569         struct i5k_amb_data *data = platform_get_drvdata(pdev);
570 
571         hwmon_device_unregister(data->hwmon_dev);
572         device_remove_file(&pdev->dev, &dev_attr_name);
573         for (i = 0; i < data->num_attrs; i++)
574                 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
575         kfree(data->attrs);
576         iounmap(data->amb_mmio);
577         release_mem_region(data->amb_base, data->amb_len);
578         kfree(data);
579         return 0;
580 }
581 
582 static struct platform_driver i5k_amb_driver = {
583         .driver = {
584                 .owner = THIS_MODULE,
585                 .name = DRVNAME,
586         },
587         .probe = i5k_amb_probe,
588         .remove = i5k_amb_remove,
589 };
590 
591 static int __init i5k_amb_init(void)
592 {
593         int res;
594 
595         res = platform_driver_register(&i5k_amb_driver);
596         if (res)
597                 return res;
598 
599         res = i5k_amb_add();
600         if (res)
601                 platform_driver_unregister(&i5k_amb_driver);
602 
603         return res;
604 }
605 
606 static void __exit i5k_amb_exit(void)
607 {
608         platform_device_unregister(amb_pdev);
609         platform_driver_unregister(&i5k_amb_driver);
610 }
611 
612 MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
613 MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor");
614 MODULE_LICENSE("GPL");
615 
616 module_init(i5k_amb_init);
617 module_exit(i5k_amb_exit);
618 

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