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10#include <linux/module.h>
11#include <linux/hwmon.h>
12#include <linux/hwmon-sysfs.h>
13#include <linux/err.h>
14#include <linux/mutex.h>
15#include <linux/log2.h>
16#include <linux/pci.h>
17#include <linux/platform_device.h>
18#include <linux/slab.h>
19
20#define DRVNAME "i5k_amb"
21
22#define I5K_REG_AMB_BASE_ADDR 0x48
23#define I5K_REG_AMB_LEN_ADDR 0x50
24#define I5K_REG_CHAN0_PRESENCE_ADDR 0x64
25#define I5K_REG_CHAN1_PRESENCE_ADDR 0x66
26
27#define AMB_REG_TEMP_MIN_ADDR 0x80
28#define AMB_REG_TEMP_MID_ADDR 0x81
29#define AMB_REG_TEMP_MAX_ADDR 0x82
30#define AMB_REG_TEMP_STATUS_ADDR 0x84
31#define AMB_REG_TEMP_ADDR 0x85
32
33#define AMB_CONFIG_SIZE 2048
34#define AMB_FUNC_3_OFFSET 768
35
36static unsigned long amb_reg_temp_status(unsigned int amb)
37{
38 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR +
39 AMB_CONFIG_SIZE * amb;
40}
41
42static unsigned long amb_reg_temp_min(unsigned int amb)
43{
44 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR +
45 AMB_CONFIG_SIZE * amb;
46}
47
48static unsigned long amb_reg_temp_mid(unsigned int amb)
49{
50 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR +
51 AMB_CONFIG_SIZE * amb;
52}
53
54static unsigned long amb_reg_temp_max(unsigned int amb)
55{
56 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR +
57 AMB_CONFIG_SIZE * amb;
58}
59
60static unsigned long amb_reg_temp(unsigned int amb)
61{
62 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR +
63 AMB_CONFIG_SIZE * amb;
64}
65
66#define MAX_MEM_CHANNELS 4
67#define MAX_AMBS_PER_CHANNEL 16
68#define MAX_AMBS (MAX_MEM_CHANNELS * \
69 MAX_AMBS_PER_CHANNEL)
70#define CHANNEL_SHIFT 4
71#define DIMM_MASK 0xF
72
73
74
75
76
77
78
79#define REAL_MAX_AMBS_PER_CHANNEL 15
80#define KNOBS_PER_AMB 6
81
82static unsigned long amb_num_from_reg(unsigned int byte_num, unsigned int bit)
83{
84 return byte_num * MAX_AMBS_PER_CHANNEL + bit;
85}
86
87#define AMB_SYSFS_NAME_LEN 16
88struct i5k_device_attribute {
89 struct sensor_device_attribute s_attr;
90 char name[AMB_SYSFS_NAME_LEN];
91};
92
93struct i5k_amb_data {
94 struct device *hwmon_dev;
95
96 unsigned long amb_base;
97 unsigned long amb_len;
98 u16 amb_present[MAX_MEM_CHANNELS];
99 void __iomem *amb_mmio;
100 struct i5k_device_attribute *attrs;
101 unsigned int num_attrs;
102};
103
104static ssize_t name_show(struct device *dev, struct device_attribute *devattr,
105 char *buf)
106{
107 return sprintf(buf, "%s\n", DRVNAME);
108}
109
110
111static DEVICE_ATTR_RO(name);
112
113static struct platform_device *amb_pdev;
114
115static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset)
116{
117 return ioread8(data->amb_mmio + offset);
118}
119
120static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset,
121 u8 val)
122{
123 iowrite8(val, data->amb_mmio + offset);
124}
125
126static ssize_t show_amb_alarm(struct device *dev,
127 struct device_attribute *devattr,
128 char *buf)
129{
130 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
131 struct i5k_amb_data *data = dev_get_drvdata(dev);
132
133 if (!(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x20) &&
134 (amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x8))
135 return sprintf(buf, "1\n");
136 else
137 return sprintf(buf, "0\n");
138}
139
140static ssize_t store_amb_min(struct device *dev,
141 struct device_attribute *devattr,
142 const char *buf,
143 size_t count)
144{
145 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
146 struct i5k_amb_data *data = dev_get_drvdata(dev);
147 unsigned long temp;
148 int ret = kstrtoul(buf, 10, &temp);
149 if (ret < 0)
150 return ret;
151
152 temp = temp / 500;
153 if (temp > 255)
154 temp = 255;
155
156 amb_write_byte(data, amb_reg_temp_min(attr->index), temp);
157 return count;
158}
159
160static ssize_t store_amb_mid(struct device *dev,
161 struct device_attribute *devattr,
162 const char *buf,
163 size_t count)
164{
165 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
166 struct i5k_amb_data *data = dev_get_drvdata(dev);
167 unsigned long temp;
168 int ret = kstrtoul(buf, 10, &temp);
169 if (ret < 0)
170 return ret;
171
172 temp = temp / 500;
173 if (temp > 255)
174 temp = 255;
175
176 amb_write_byte(data, amb_reg_temp_mid(attr->index), temp);
177 return count;
178}
179
180static ssize_t store_amb_max(struct device *dev,
181 struct device_attribute *devattr,
182 const char *buf,
183 size_t count)
184{
185 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
186 struct i5k_amb_data *data = dev_get_drvdata(dev);
187 unsigned long temp;
188 int ret = kstrtoul(buf, 10, &temp);
189 if (ret < 0)
190 return ret;
191
192 temp = temp / 500;
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
200static 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
210static 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
220static 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
230static 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
240static ssize_t show_label(struct device *dev,
241 struct device_attribute *devattr,
242 char *buf)
243{
244 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
245
246 return sprintf(buf, "Ch. %d DIMM %d\n", attr->index >> CHANNEL_SHIFT,
247 attr->index & DIMM_MASK);
248}
249
250static int i5k_amb_hwmon_init(struct platform_device *pdev)
251{
252 int i, j, k, d = 0;
253 u16 c;
254 int res = 0;
255 int num_ambs = 0;
256 struct i5k_amb_data *data = platform_get_drvdata(pdev);
257
258
259
260 for (i = 0; i < MAX_MEM_CHANNELS; i++)
261 num_ambs += hweight16(data->amb_present[i] & 0x7fff);
262
263
264 data->attrs = kzalloc(array3_size(num_ambs, KNOBS_PER_AMB,
265 sizeof(*data->attrs)),
266 GFP_KERNEL);
267 if (!data->attrs)
268 return -ENOMEM;
269 data->num_attrs = 0;
270
271 for (i = 0; i < MAX_MEM_CHANNELS; i++) {
272 c = data->amb_present[i];
273 for (j = 0; j < REAL_MAX_AMBS_PER_CHANNEL; j++, c >>= 1) {
274 struct i5k_device_attribute *iattr;
275
276 k = amb_num_from_reg(i, j);
277 if (!(c & 0x1))
278 continue;
279 d++;
280
281
282 iattr = data->attrs + data->num_attrs;
283 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
284 "temp%d_label", d);
285 iattr->s_attr.dev_attr.attr.name = iattr->name;
286 iattr->s_attr.dev_attr.attr.mode = 0444;
287 iattr->s_attr.dev_attr.show = show_label;
288 iattr->s_attr.index = k;
289 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
290 res = device_create_file(&pdev->dev,
291 &iattr->s_attr.dev_attr);
292 if (res)
293 goto exit_remove;
294 data->num_attrs++;
295
296
297 iattr = data->attrs + data->num_attrs;
298 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
299 "temp%d_input", d);
300 iattr->s_attr.dev_attr.attr.name = iattr->name;
301 iattr->s_attr.dev_attr.attr.mode = 0444;
302 iattr->s_attr.dev_attr.show = show_amb_temp;
303 iattr->s_attr.index = k;
304 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
305 res = device_create_file(&pdev->dev,
306 &iattr->s_attr.dev_attr);
307 if (res)
308 goto exit_remove;
309 data->num_attrs++;
310
311
312 iattr = data->attrs + data->num_attrs;
313 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
314 "temp%d_min", d);
315 iattr->s_attr.dev_attr.attr.name = iattr->name;
316 iattr->s_attr.dev_attr.attr.mode = 0644;
317 iattr->s_attr.dev_attr.show = show_amb_min;
318 iattr->s_attr.dev_attr.store = store_amb_min;
319 iattr->s_attr.index = k;
320 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
321 res = device_create_file(&pdev->dev,
322 &iattr->s_attr.dev_attr);
323 if (res)
324 goto exit_remove;
325 data->num_attrs++;
326
327
328 iattr = data->attrs + data->num_attrs;
329 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
330 "temp%d_mid", d);
331 iattr->s_attr.dev_attr.attr.name = iattr->name;
332 iattr->s_attr.dev_attr.attr.mode = 0644;
333 iattr->s_attr.dev_attr.show = show_amb_mid;
334 iattr->s_attr.dev_attr.store = store_amb_mid;
335 iattr->s_attr.index = k;
336 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
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 iattr = data->attrs + data->num_attrs;
345 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
346 "temp%d_max", d);
347 iattr->s_attr.dev_attr.attr.name = iattr->name;
348 iattr->s_attr.dev_attr.attr.mode = 0644;
349 iattr->s_attr.dev_attr.show = show_amb_max;
350 iattr->s_attr.dev_attr.store = store_amb_max;
351 iattr->s_attr.index = k;
352 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
353 res = device_create_file(&pdev->dev,
354 &iattr->s_attr.dev_attr);
355 if (res)
356 goto exit_remove;
357 data->num_attrs++;
358
359
360 iattr = data->attrs + data->num_attrs;
361 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
362 "temp%d_alarm", d);
363 iattr->s_attr.dev_attr.attr.name = iattr->name;
364 iattr->s_attr.dev_attr.attr.mode = 0444;
365 iattr->s_attr.dev_attr.show = show_amb_alarm;
366 iattr->s_attr.index = k;
367 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
368 res = device_create_file(&pdev->dev,
369 &iattr->s_attr.dev_attr);
370 if (res)
371 goto exit_remove;
372 data->num_attrs++;
373 }
374 }
375
376 res = device_create_file(&pdev->dev, &dev_attr_name);
377 if (res)
378 goto exit_remove;
379
380 data->hwmon_dev = hwmon_device_register(&pdev->dev);
381 if (IS_ERR(data->hwmon_dev)) {
382 res = PTR_ERR(data->hwmon_dev);
383 goto exit_remove;
384 }
385
386 return res;
387
388exit_remove:
389 device_remove_file(&pdev->dev, &dev_attr_name);
390 for (i = 0; i < data->num_attrs; i++)
391 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
392 kfree(data->attrs);
393
394 return res;
395}
396
397static int i5k_amb_add(void)
398{
399 int res = -ENODEV;
400
401
402 amb_pdev = platform_device_alloc(DRVNAME, 0);
403 if (!amb_pdev)
404 return -ENOMEM;
405
406 res = platform_device_add(amb_pdev);
407 if (res)
408 goto err;
409 return 0;
410
411err:
412 platform_device_put(amb_pdev);
413 return res;
414}
415
416static int i5k_find_amb_registers(struct i5k_amb_data *data,
417 unsigned long devid)
418{
419 struct pci_dev *pcidev;
420 u32 val32;
421 int res = -ENODEV;
422
423
424 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL,
425 devid,
426 NULL);
427 if (!pcidev)
428 return -ENODEV;
429
430 if (pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32))
431 goto out;
432 data->amb_base = val32;
433
434 if (pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32))
435 goto out;
436 data->amb_len = val32;
437
438
439 if (data->amb_len < AMB_CONFIG_SIZE * MAX_AMBS) {
440 dev_err(&pcidev->dev, "AMB region too small!\n");
441 goto out;
442 }
443
444 res = 0;
445out:
446 pci_dev_put(pcidev);
447 return res;
448}
449
450static int i5k_channel_probe(u16 *amb_present, unsigned long dev_id)
451{
452 struct pci_dev *pcidev;
453 u16 val16;
454 int res = -ENODEV;
455
456
457 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, dev_id, NULL);
458 if (!pcidev)
459 return -ENODEV;
460
461 if (pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16))
462 goto out;
463 amb_present[0] = val16;
464
465 if (pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16))
466 goto out;
467 amb_present[1] = val16;
468
469 res = 0;
470
471out:
472 pci_dev_put(pcidev);
473 return res;
474}
475
476static struct {
477 unsigned long err;
478 unsigned long fbd0;
479} chipset_ids[] = {
480 { PCI_DEVICE_ID_INTEL_5000_ERR, PCI_DEVICE_ID_INTEL_5000_FBD0 },
481 { PCI_DEVICE_ID_INTEL_5400_ERR, PCI_DEVICE_ID_INTEL_5400_FBD0 },
482 { 0, 0 }
483};
484
485#ifdef MODULE
486static const struct pci_device_id i5k_amb_ids[] = {
487 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5000_ERR) },
488 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5400_ERR) },
489 { 0, }
490};
491MODULE_DEVICE_TABLE(pci, i5k_amb_ids);
492#endif
493
494static int i5k_amb_probe(struct platform_device *pdev)
495{
496 struct i5k_amb_data *data;
497 struct resource *reso;
498 int i, res;
499
500 data = kzalloc(sizeof(*data), GFP_KERNEL);
501 if (!data)
502 return -ENOMEM;
503
504
505 i = 0;
506 do {
507 res = i5k_find_amb_registers(data, chipset_ids[i].err);
508 if (res == 0)
509 break;
510 i++;
511 } while (chipset_ids[i].err);
512
513 if (res)
514 goto err;
515
516
517 res = i5k_channel_probe(&data->amb_present[0], chipset_ids[i].fbd0);
518 if (res)
519 goto err;
520
521
522 i5k_channel_probe(&data->amb_present[2], chipset_ids[i].fbd0 + 1);
523
524
525 reso = request_mem_region(data->amb_base, data->amb_len, DRVNAME);
526 if (!reso) {
527 res = -EBUSY;
528 goto err;
529 }
530
531 data->amb_mmio = ioremap_nocache(data->amb_base, data->amb_len);
532 if (!data->amb_mmio) {
533 res = -EBUSY;
534 goto err_map_failed;
535 }
536
537 platform_set_drvdata(pdev, data);
538
539 res = i5k_amb_hwmon_init(pdev);
540 if (res)
541 goto err_init_failed;
542
543 return res;
544
545err_init_failed:
546 iounmap(data->amb_mmio);
547err_map_failed:
548 release_mem_region(data->amb_base, data->amb_len);
549err:
550 kfree(data);
551 return res;
552}
553
554static int i5k_amb_remove(struct platform_device *pdev)
555{
556 int i;
557 struct i5k_amb_data *data = platform_get_drvdata(pdev);
558
559 hwmon_device_unregister(data->hwmon_dev);
560 device_remove_file(&pdev->dev, &dev_attr_name);
561 for (i = 0; i < data->num_attrs; i++)
562 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
563 kfree(data->attrs);
564 iounmap(data->amb_mmio);
565 release_mem_region(data->amb_base, data->amb_len);
566 kfree(data);
567 return 0;
568}
569
570static struct platform_driver i5k_amb_driver = {
571 .driver = {
572 .name = DRVNAME,
573 },
574 .probe = i5k_amb_probe,
575 .remove = i5k_amb_remove,
576};
577
578static int __init i5k_amb_init(void)
579{
580 int res;
581
582 res = platform_driver_register(&i5k_amb_driver);
583 if (res)
584 return res;
585
586 res = i5k_amb_add();
587 if (res)
588 platform_driver_unregister(&i5k_amb_driver);
589
590 return res;
591}
592
593static void __exit i5k_amb_exit(void)
594{
595 platform_device_unregister(amb_pdev);
596 platform_driver_unregister(&i5k_amb_driver);
597}
598
599MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
600MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor");
601MODULE_LICENSE("GPL");
602
603module_init(i5k_amb_init);
604module_exit(i5k_amb_exit);
605