aboutsummaryrefslogtreecommitdiff
path: root/drivers/hwmon/i5k_amb.c
blob: b09c39abd3a818cf2d710588a9d6267a1360e577 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * A hwmon driver for the Intel 5000 series chipset FB-DIMM AMB
 * temperature sensors
 * Copyright (C) 2007 IBM
 *
 * Author: Darrick J. Wong <darrick.wong@oracle.com>
 */

#include <linux/module.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/log2.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#define DRVNAME "i5k_amb"

#define I5K_REG_AMB_BASE_ADDR		0x48
#define I5K_REG_AMB_LEN_ADDR		0x50
#define I5K_REG_CHAN0_PRESENCE_ADDR	0x64
#define I5K_REG_CHAN1_PRESENCE_ADDR	0x66

#define AMB_REG_TEMP_MIN_ADDR		0x80
#define AMB_REG_TEMP_MID_ADDR		0x81
#define AMB_REG_TEMP_MAX_ADDR		0x82
#define AMB_REG_TEMP_STATUS_ADDR	0x84
#define AMB_REG_TEMP_ADDR		0x85

#define AMB_CONFIG_SIZE			2048
#define AMB_FUNC_3_OFFSET		768

static unsigned long amb_reg_temp_status(unsigned int amb)
{
	return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR +
	       AMB_CONFIG_SIZE * amb;
}

static unsigned long amb_reg_temp_min(unsigned int amb)
{
	return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR +
	       AMB_CONFIG_SIZE * amb;
}

static unsigned long amb_reg_temp_mid(unsigned int amb)
{
	return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR +
	       AMB_CONFIG_SIZE * amb;
}

static unsigned long amb_reg_temp_max(unsigned int amb)
{
	return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR +
	       AMB_CONFIG_SIZE * amb;
}

static unsigned long amb_reg_temp(unsigned int amb)
{
	return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR +
	       AMB_CONFIG_SIZE * amb;
}

#define MAX_MEM_CHANNELS		4
#define MAX_AMBS_PER_CHANNEL		16
#define MAX_AMBS			(MAX_MEM_CHANNELS * \
					 MAX_AMBS_PER_CHANNEL)
#define CHANNEL_SHIFT			4
#define DIMM_MASK			0xF
/*
 * Ugly hack: For some reason the highest bit is set if there
 * are _any_ DIMMs in the channel.  Attempting to read from
 * this "high-order" AMB results in a memory bus error, so
 * for now we'll just ignore that top bit, even though that
 * might prevent us from seeing the 16th DIMM in the channel.
 */
#define REAL_MAX_AMBS_PER_CHANNEL	15
#define KNOBS_PER_AMB			6

static unsigned long amb_num_from_reg(unsigned int byte_num, unsigned int bit)
{
	return byte_num * MAX_AMBS_PER_CHANNEL + bit;
}

#define AMB_SYSFS_NAME_LEN		16
struct i5k_device_attribute {
	struct sensor_device_attribute s_attr;
	char name[AMB_SYSFS_NAME_LEN];
};

struct i5k_amb_data {
	struct device *hwmon_dev;

	unsigned long amb_base;
	unsigned long amb_len;
	u16 amb_present[MAX_MEM_CHANNELS];
	void __iomem *amb_mmio;
	struct i5k_device_attribute *attrs;
	unsigned int num_attrs;
};

static ssize_t name_show(struct device *dev, struct device_attribute *devattr,
			 char *buf)
{
	return sprintf(buf, "%s\n", DRVNAME);
}


static DEVICE_ATTR_RO(name);

static struct platform_device *amb_pdev;

static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset)
{
	return ioread8(data->amb_mmio + offset);
}

static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset,
			   u8 val)
{
	iowrite8(val, data->amb_mmio + offset);
}

static ssize_t show_amb_alarm(struct device *dev,
			     struct device_attribute *devattr,
			     char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct i5k_amb_data *data = dev_get_drvdata(dev);

	if (!(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x20) &&
	     (amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x8))
		return sprintf(buf, "1\n");
	else
		return sprintf(buf, "0\n");
}

static ssize_t store_amb_min(struct device *dev,
			     struct device_attribute *devattr,
			     const char *buf,
			     size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct i5k_amb_data *data = dev_get_drvdata(dev);
	unsigned long temp;
	int ret = kstrtoul(buf, 10, &temp);
	if (ret < 0)
		return ret;

	temp = temp / 500;
	if (temp > 255)
		temp = 255;

	amb_write_byte(data, amb_reg_temp_min(attr->index), temp);
	return count;
}

static ssize_t store_amb_mid(struct device *dev,
			     struct device_attribute *devattr,
			     const char *buf,
			     size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct i5k_amb_data *data = dev_get_drvdata(dev);
	unsigned long temp;
	int ret = kstrtoul(buf, 10, &temp);
	if (ret < 0)
		return ret;

	temp = temp / 500;
	if (temp > 255)
		temp = 255;

	amb_write_byte(data, amb_reg_temp_mid(attr->index), temp);
	return count;
}

static ssize_t store_amb_max(struct device *dev,
			     struct device_attribute *devattr,
			     const char *buf,
			     size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct i5k_amb_data *data = dev_get_drvdata(dev);
	unsigned long temp;
	int ret = kstrtoul(buf, 10, &temp);
	if (ret < 0)
		return ret;

	temp = temp / 500;
	if (temp > 255)
		temp = 255;

	amb_write_byte(data, amb_reg_temp_max(attr->index), temp);
	return count;
}

static ssize_t show_amb_min(struct device *dev,
			     struct device_attribute *devattr,
			     char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct i5k_amb_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n",
		500 * amb_read_byte(data, amb_reg_temp_min(attr->index)));
}

static ssize_t show_amb_mid(struct device *dev,
			     struct device_attribute *devattr,
			     char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct i5k_amb_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n",
		500 * amb_read_byte(data, amb_reg_temp_mid(attr->index)));
}

static ssize_t show_amb_max(struct device *dev,
			     struct device_attribute *devattr,
			     char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct i5k_amb_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n",
		500 * amb_read_byte(data, amb_reg_temp_max(attr->index)));
}

static ssize_t show_amb_temp(struct device *dev,
			     struct device_attribute *devattr,
			     char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct i5k_amb_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n",
		500 * amb_read_byte(data, amb_reg_temp(attr->index)));
}

static ssize_t show_label(struct device *dev,
			  struct device_attribute *devattr,
			  char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

	return sprintf(buf, "Ch. %d DIMM %d\n", attr->index >> CHANNEL_SHIFT,
		       attr->index & DIMM_MASK);
}

static int i5k_amb_hwmon_init(struct platform_device *pdev)
{
	int i, j, k, d = 0;
	u16 c;
	int res = 0;
	int num_ambs = 0;
	struct i5k_amb_data *data = platform_get_drvdata(pdev);

	/* Count the number of AMBs found */
	/* ignore the high-order bit, see "Ugly hack" comment above */
	for (i = 0; i < MAX_MEM_CHANNELS; i++)
		num_ambs += hweight16(data->amb_present[i] & 0x7fff);

	/* Set up sysfs stuff */
	data->attrs = kzalloc(array3_size(num_ambs, KNOBS_PER_AMB,
					  sizeof(*data->attrs)),
			      GFP_KERNEL);
	if (!data->attrs)
		return -ENOMEM;
	data->num_attrs = 0;

	for (i = 0; i < MAX_MEM_CHANNELS; i++) {
		c = data->amb_present[i];
		for (j = 0; j < REAL_MAX_AMBS_PER_CHANNEL; j++, c >>= 1) {
			struct i5k_device_attribute *iattr;

			k = amb_num_from_reg(i, j);
			if (!(c & 0x1))
				continue;
			d++;

			/* sysfs label */
			iattr = data->attrs + data->num_attrs;
			snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
				 "temp%d_label", d);
			iattr->s_attr.dev_attr.attr.name = iattr->name;
			iattr->s_attr.dev_attr.attr.mode = 0444;
			iattr->s_attr.dev_attr.show = show_label;
			iattr->s_attr.index = k;
			sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
			res = device_create_file(&pdev->dev,
						 &iattr->s_attr.dev_attr);
			if (res)
				goto exit_remove;
			data->num_attrs++;

			/* Temperature sysfs knob */
			iattr = data->attrs + data->num_attrs;
			snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
				 "temp%d_input", d);
			iattr->s_attr.dev_attr.attr.name = iattr->name;
			iattr->s_attr.dev_attr.attr.mode = 0444;
			iattr->s_attr.dev_attr.show = show_amb_temp;
			iattr->s_attr.index = k;
			sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
			res = device_create_file(&pdev->dev,
						 &iattr->s_attr.dev_attr);
			if (res)
				goto exit_remove;
			data->num_attrs++;

			/* Temperature min sysfs knob */
			iattr = data->attrs + data->num_attrs;
			snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
				 "temp%d_min", d);
			iattr->s_attr.dev_attr.attr.name = iattr->name;
			iattr->s_attr.dev_attr.attr.mode = 0644;
			iattr->s_attr.dev_attr.show = show_amb_min;
			iattr->s_attr.dev_attr.store = store_amb_min;
			iattr->s_attr.index = k;
			sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
			res = device_create_file(&pdev->dev,
						 &iattr->s_attr.dev_attr);
			if (res)
				goto exit_remove;
			data->num_attrs++;

			/* Temperature mid sysfs knob */
			iattr = data->attrs + data->num_attrs;
			snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
				 "temp%d_mid", d);
			iattr->s_attr.dev_attr.attr.name = iattr->name;
			iattr->s_attr.dev_attr.attr.mode = 0644;
			iattr->s_attr.dev_attr.show = show_amb_mid;
			iattr->s_attr.dev_attr.store = store_amb_mid;
			iattr->s_attr.index = k;
			sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
			res = device_create_file(&pdev->dev,
						 &iattr->s_attr.dev_attr);
			if (res)
				goto exit_remove;
			data->num_attrs++;

			/* Temperature max sysfs knob */
			iattr = data->attrs + data->num_attrs;
			snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
				 "temp%d_max", d);
			iattr->s_attr.dev_attr.attr.name = iattr->name;
			iattr->s_attr.dev_attr.attr.mode = 0644;
			iattr->s_attr.dev_attr.show = show_amb_max;
			iattr->s_attr.dev_attr.store = store_amb_max;
			iattr->s_attr.index = k;
			sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
			res = device_create_file(&pdev->dev,
						 &iattr->s_attr.dev_attr);
			if (res)
				goto exit_remove;
			data->num_attrs++;

			/* Temperature alarm sysfs knob */
			iattr = data->attrs + data->num_attrs;
			snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
				 "temp%d_alarm", d);
			iattr->s_attr.dev_attr.attr.name = iattr->name;
			iattr->s_attr.dev_attr.attr.mode = 0444;
			iattr->s_attr.dev_attr.show = show_amb_alarm;
			iattr->s_attr.index = k;
			sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
			res = device_create_file(&pdev->dev,
						 &iattr->s_attr.dev_attr);
			if (res)
				goto exit_remove;
			data->num_attrs++;
		}
	}

	res = device_create_file(&pdev->dev, &dev_attr_name);
	if (res)
		goto exit_remove;

	data->hwmon_dev = hwmon_device_register(&pdev->dev);
	if (IS_ERR(data->hwmon_dev)) {
		res = PTR_ERR(data->hwmon_dev);
		goto exit_remove;
	}

	return res;

exit_remove:
	device_remove_file(&pdev->dev, &dev_attr_name);
	for (i = 0; i < data->num_attrs; i++)
		device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
	kfree(data->attrs);

	return res;
}

static int i5k_amb_add(void)
{
	int res = -ENODEV;

	/* only ever going to be one of these */
	amb_pdev = platform_device_alloc(DRVNAME, 0);
	if (!amb_pdev)
		return -ENOMEM;

	res = platform_device_add(amb_pdev);
	if (res)
		goto err;
	return 0;

err:
	platform_device_put(amb_pdev);
	return res;
}

static int i5k_find_amb_registers(struct i5k_amb_data *data,
					    unsigned long devid)
{
	struct pci_dev *pcidev;
	u32 val32;
	int res = -ENODEV;

	/* Find AMB register memory space */
	pcidev = pci_get_device(PCI_VENDOR_ID_INTEL,
				devid,
				NULL);
	if (!pcidev)
		return -ENODEV;

	if (pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32))
		goto out;
	data->amb_base = val32;

	if (pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32))
		goto out;
	data->amb_len = val32;

	/* Is it big enough? */
	if (data->amb_len < AMB_CONFIG_SIZE * MAX_AMBS) {
		dev_err(&pcidev->dev, "AMB region too small!\n");
		goto out;
	}

	res = 0;
out:
	pci_dev_put(pcidev);
	return res;
}

static int i5k_channel_probe(u16 *amb_present, unsigned long dev_id)
{
	struct pci_dev *pcidev;
	u16 val16;
	int res = -ENODEV;

	/* Copy the DIMM presence map for these two channels */
	pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, dev_id, NULL);
	if (!pcidev)
		return -ENODEV;

	if (pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16))
		goto out;
	amb_present[0] = val16;

	if (pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16))
		goto out;
	amb_present[1] = val16;

	res = 0;

out:
	pci_dev_put(pcidev);
	return res;
}

static struct {
	unsigned long err;
	unsigned long fbd0;
} chipset_ids[]  = {
	{ PCI_DEVICE_ID_INTEL_5000_ERR, PCI_DEVICE_ID_INTEL_5000_FBD0 },
	{ PCI_DEVICE_ID_INTEL_5400_ERR, PCI_DEVICE_ID_INTEL_5400_FBD0 },
	{ 0, 0 }
};

#ifdef MODULE
static const struct pci_device_id i5k_amb_ids[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5000_ERR) },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5400_ERR) },
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, i5k_amb_ids);
#endif

static int i5k_amb_probe(struct platform_device *pdev)
{
	struct i5k_amb_data *data;
	struct resource *reso;
	int i, res;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	/* Figure out where the AMB registers live */
	i = 0;
	do {
		res = i5k_find_amb_registers(data, chipset_ids[i].err);
		if (res == 0)
			break;
		i++;
	} while (chipset_ids[i].err);

	if (res)
		goto err;

	/* Copy the DIMM presence map for the first two channels */
	res = i5k_channel_probe(&data->amb_present[0], chipset_ids[i].fbd0);
	if (res)
		goto err;

	/* Copy the DIMM presence map for the optional second two channels */
	i5k_channel_probe(&data->amb_present[2], chipset_ids[i].fbd0 + 1);

	/* Set up resource regions */
	reso = request_mem_region(data->amb_base, data->amb_len, DRVNAME);
	if (!reso) {
		res = -EBUSY;
		goto err;
	}

	data->amb_mmio = ioremap_nocache(data->amb_base, data->amb_len);
	if (!data->amb_mmio) {
		res = -EBUSY;
		goto err_map_failed;
	}

	platform_set_drvdata(pdev, data);

	res = i5k_amb_hwmon_init(pdev);
	if (res)
		goto err_init_failed;

	return res;

err_init_failed:
	iounmap(data->amb_mmio);
err_map_failed:
	release_mem_region(data->amb_base, data->amb_len);
err:
	kfree(data);
	return res;
}

static int i5k_amb_remove(struct platform_device *pdev)
{
	int i;
	struct i5k_amb_data *data = platform_get_drvdata(pdev);

	hwmon_device_unregister(data->hwmon_dev);
	device_remove_file(&pdev->dev, &dev_attr_name);
	for (i = 0; i < data->num_attrs; i++)
		device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
	kfree(data->attrs);
	iounmap(data->amb_mmio);
	release_mem_region(data->amb_base, data->amb_len);
	kfree(data);
	return 0;
}

static struct platform_driver i5k_amb_driver = {
	.driver = {
		.name = DRVNAME,
	},
	.probe = i5k_amb_probe,
	.remove = i5k_amb_remove,
};

static int __init i5k_amb_init(void)
{
	int res;

	res = platform_driver_register(&i5k_amb_driver);
	if (res)
		return res;

	res = i5k_amb_add();
	if (res)
		platform_driver_unregister(&i5k_amb_driver);

	return res;
}

static void __exit i5k_amb_exit(void)
{
	platform_device_unregister(amb_pdev);
	platform_driver_unregister(&i5k_amb_driver);
}

MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor");
MODULE_LICENSE("GPL");

module_init(i5k_amb_init);
module_exit(i5k_amb_exit);