summaryrefslogtreecommitdiffstats
path: root/drivers/hwmon/k8temp.c
blob: 143a2f8079a319272477491d8ee2e454c3426e6c (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
/*
 * k8temp.c - Linux kernel module for hardware monitoring
 *
 * Copyright (C) 2006 Rudolf Marek <r.marek@assembler.cz>
 *
 * Inspired from the w83785 and amd756 drivers.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/pci.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <asm/processor.h>

#define TEMP_FROM_REG(val)	(((((val) >> 16) & 0xff) - 49) * 1000)
#define REG_TEMP	0xe4
#define SEL_PLACE	0x40
#define SEL_CORE	0x04

struct k8temp_data {
	struct device *hwmon_dev;
	struct mutex update_lock;
	const char *name;
	char valid;		/* zero until following fields are valid */
	unsigned long last_updated;	/* in jiffies */

	/* registers values */
	u8 sensorsp;		/* sensor presence bits - SEL_CORE, SEL_PLACE */
	u32 temp[2][2];		/* core, place */
	u8 swap_core_select;    /* meaning of SEL_CORE is inverted */
	u32 temp_offset;
};

static struct k8temp_data *k8temp_update_device(struct device *dev)
{
	struct k8temp_data *data = dev_get_drvdata(dev);
	struct pci_dev *pdev = to_pci_dev(dev);
	u8 tmp;

	mutex_lock(&data->update_lock);

	if (!data->valid
	    || time_after(jiffies, data->last_updated + HZ)) {
		pci_read_config_byte(pdev, REG_TEMP, &tmp);
		tmp &= ~(SEL_PLACE | SEL_CORE);	/* Select sensor 0, core0 */
		pci_write_config_byte(pdev, REG_TEMP, tmp);
		pci_read_config_dword(pdev, REG_TEMP, &data->temp[0][0]);

		if (data->sensorsp & SEL_PLACE) {
			tmp |= SEL_PLACE;	/* Select sensor 1, core0 */
			pci_write_config_byte(pdev, REG_TEMP, tmp);
			pci_read_config_dword(pdev, REG_TEMP,
					      &data->temp[0][1]);
		}

		if (data->sensorsp & SEL_CORE) {
			tmp &= ~SEL_PLACE;	/* Select sensor 0, core1 */
			tmp |= SEL_CORE;
			pci_write_config_byte(pdev, REG_TEMP, tmp);
			pci_read_config_dword(pdev, REG_TEMP,
					      &data->temp[1][0]);

			if (data->sensorsp & SEL_PLACE) {
				tmp |= SEL_PLACE; /* Select sensor 1, core1 */
				pci_write_config_byte(pdev, REG_TEMP, tmp);
				pci_read_config_dword(pdev, REG_TEMP,
						      &data->temp[1][1]);
			}
		}

		data->last_updated = jiffies;
		data->valid = 1;
	}

	mutex_unlock(&data->update_lock);
	return data;
}

/*
 * Sysfs stuff
 */

static ssize_t show_name(struct device *dev, struct device_attribute
			 *devattr, char *buf)
{
	struct k8temp_data *data = dev_get_drvdata(dev);

	return sprintf(buf, "%s\n", data->name);
}


static ssize_t show_temp(struct device *dev,
			 struct device_attribute *devattr, char *buf)
{
	struct sensor_device_attribute_2 *attr =
	    to_sensor_dev_attr_2(devattr);
	int core = attr->nr;
	int place = attr->index;
	int temp;
	struct k8temp_data *data = k8temp_update_device(dev);

	if (data->swap_core_select && (data->sensorsp & SEL_CORE))
		core = core ? 0 : 1;

	temp = TEMP_FROM_REG(data->temp[core][place]) + data->temp_offset;

	return sprintf(buf, "%d\n", temp);
}

/* core, place */

static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 1, 0);
static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 1, 1);
static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);

static DEFINE_PCI_DEVICE_TABLE(k8temp_ids) = {
	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
	{ 0 },
};

MODULE_DEVICE_TABLE(pci, k8temp_ids);

static int __devinit is_rev_g_desktop(u8 model)
{
	u32 brandidx;

	if (model < 0x69)
		return 0;

	if (model == 0xc1 || model == 0x6c || model == 0x7c)
		return 0;

	/*
	 * Differentiate between AM2 and ASB1.
	 * See "Constructing the processor Name String" in "Revision
	 * Guide for AMD NPT Family 0Fh Processors" (33610).
	 */
	brandidx = cpuid_ebx(0x80000001);
	brandidx = (brandidx >> 9) & 0x1f;

	/* Single core */
	if ((model == 0x6f || model == 0x7f) &&
	    (brandidx == 0x7 || brandidx == 0x9 || brandidx == 0xc))
		return 0;

	/* Dual core */
	if (model == 0x6b &&
	    (brandidx == 0xb || brandidx == 0xc))
		return 0;

	return 1;
}

static int __devinit k8temp_probe(struct pci_dev *pdev,
				  const struct pci_device_id *id)
{
	int err;
	u8 scfg;
	u32 temp;
	u8 model, stepping;
	struct k8temp_data *data;

	data = devm_kzalloc(&pdev->dev, sizeof(struct k8temp_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	model = boot_cpu_data.x86_model;
	stepping = boot_cpu_data.x86_mask;

	/* feature available since SH-C0, exclude older revisions */
	if ((model == 4 && stepping == 0) ||
	    (model == 5 && stepping <= 1))
		return -ENODEV;

	/*
	 * AMD NPT family 0fh, i.e. RevF and RevG:
	 * meaning of SEL_CORE bit is inverted
	 */
	if (model >= 0x40) {
		data->swap_core_select = 1;
		dev_warn(&pdev->dev, "Temperature readouts might be wrong - "
			 "check erratum #141\n");
	}

	/*
	 * RevG desktop CPUs (i.e. no socket S1G1 or ASB1 parts) need
	 * additional offset, otherwise reported temperature is below
	 * ambient temperature
	 */
	if (is_rev_g_desktop(model))
		data->temp_offset = 21000;

	pci_read_config_byte(pdev, REG_TEMP, &scfg);
	scfg &= ~(SEL_PLACE | SEL_CORE);	/* Select sensor 0, core0 */
	pci_write_config_byte(pdev, REG_TEMP, scfg);
	pci_read_config_byte(pdev, REG_TEMP, &scfg);

	if (scfg & (SEL_PLACE | SEL_CORE)) {
		dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n");
		return -ENODEV;
	}

	scfg |= (SEL_PLACE | SEL_CORE);
	pci_write_config_byte(pdev, REG_TEMP, scfg);

	/* now we know if we can change core and/or sensor */
	pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp);

	if (data->sensorsp & SEL_PLACE) {
		scfg &= ~SEL_CORE;	/* Select sensor 1, core0 */
		pci_write_config_byte(pdev, REG_TEMP, scfg);
		pci_read_config_dword(pdev, REG_TEMP, &temp);
		scfg |= SEL_CORE;	/* prepare for next selection */
		if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is unlikely */
			data->sensorsp &= ~SEL_PLACE;
	}

	if (data->sensorsp & SEL_CORE) {
		scfg &= ~SEL_PLACE;	/* Select sensor 0, core1 */
		pci_write_config_byte(pdev, REG_TEMP, scfg);
		pci_read_config_dword(pdev, REG_TEMP, &temp);
		if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is unlikely */
			data->sensorsp &= ~SEL_CORE;
	}

	data->name = "k8temp";
	mutex_init(&data->update_lock);
	pci_set_drvdata(pdev, data);

	/* Register sysfs hooks */
	err = device_create_file(&pdev->dev,
			   &sensor_dev_attr_temp1_input.dev_attr);
	if (err)
		goto exit_remove;

	/* sensor can be changed and reports something */
	if (data->sensorsp & SEL_PLACE) {
		err = device_create_file(&pdev->dev,
				   &sensor_dev_attr_temp2_input.dev_attr);
		if (err)
			goto exit_remove;
	}

	/* core can be changed and reports something */
	if (data->sensorsp & SEL_CORE) {
		err = device_create_file(&pdev->dev,
				   &sensor_dev_attr_temp3_input.dev_attr);
		if (err)
			goto exit_remove;
		if (data->sensorsp & SEL_PLACE) {
			err = device_create_file(&pdev->dev,
					   &sensor_dev_attr_temp4_input.
					   dev_attr);
			if (err)
				goto exit_remove;
		}
	}

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

	data->hwmon_dev = hwmon_device_register(&pdev->dev);

	if (IS_ERR(data->hwmon_dev)) {
		err = PTR_ERR(data->hwmon_dev);
		goto exit_remove;
	}

	return 0;

exit_remove:
	device_remove_file(&pdev->dev,
			   &sensor_dev_attr_temp1_input.dev_attr);
	device_remove_file(&pdev->dev,
			   &sensor_dev_attr_temp2_input.dev_attr);
	device_remove_file(&pdev->dev,
			   &sensor_dev_attr_temp3_input.dev_attr);
	device_remove_file(&pdev->dev,
			   &sensor_dev_attr_temp4_input.dev_attr);
	device_remove_file(&pdev->dev, &dev_attr_name);
	return err;
}

static void __devexit k8temp_remove(struct pci_dev *pdev)
{
	struct k8temp_data *data = pci_get_drvdata(pdev);

	hwmon_device_unregister(data->hwmon_dev);
	device_remove_file(&pdev->dev,
			   &sensor_dev_attr_temp1_input.dev_attr);
	device_remove_file(&pdev->dev,
			   &sensor_dev_attr_temp2_input.dev_attr);
	device_remove_file(&pdev->dev,
			   &sensor_dev_attr_temp3_input.dev_attr);
	device_remove_file(&pdev->dev,
			   &sensor_dev_attr_temp4_input.dev_attr);
	device_remove_file(&pdev->dev, &dev_attr_name);
}

static struct pci_driver k8temp_driver = {
	.name = "k8temp",
	.id_table = k8temp_ids,
	.probe = k8temp_probe,
	.remove = k8temp_remove,
};

module_pci_driver(k8temp_driver);

MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
MODULE_DESCRIPTION("AMD K8 core temperature monitor");
MODULE_LICENSE("GPL");