summaryrefslogtreecommitdiffstats
path: root/drivers/hwmon/k10temp.c
blob: 2722cdecc79e8b8e339ae08661a9bee990e0152a (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
/*
 * k10temp.c - AMD Family 10h/11h/12h/14h/15h processor hardware monitoring
 *
 * Copyright (c) 2009 Clemens Ladisch <clemens@ladisch.de>
 *
 *
 * This driver is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This driver 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 driver; if not, see <http://www.gnu.org/licenses/>.
 */

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

MODULE_DESCRIPTION("AMD Family 10h+ CPU core temperature monitor");
MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
MODULE_LICENSE("GPL");

static bool force;
module_param(force, bool, 0444);
MODULE_PARM_DESC(force, "force loading on processors with erratum 319");

/* CPUID function 0x80000001, ebx */
#define CPUID_PKGTYPE_MASK	0xf0000000
#define CPUID_PKGTYPE_F		0x00000000
#define CPUID_PKGTYPE_AM2R2_AM3	0x10000000

/* DRAM controller (PCI function 2) */
#define REG_DCT0_CONFIG_HIGH		0x094
#define  DDR3_MODE			0x00000100

/* miscellaneous (PCI function 3) */
#define REG_HARDWARE_THERMAL_CONTROL	0x64
#define  HTC_ENABLE			0x00000001

#define REG_REPORTED_TEMPERATURE	0xa4

#define REG_NORTHBRIDGE_CAPABILITIES	0xe8
#define  NB_CAP_HTC			0x00000400

static ssize_t show_temp(struct device *dev,
			 struct device_attribute *attr, char *buf)
{
	u32 regval;

	pci_read_config_dword(to_pci_dev(dev),
			      REG_REPORTED_TEMPERATURE, &regval);
	return sprintf(buf, "%u\n", (regval >> 21) * 125);
}

static ssize_t show_temp_max(struct device *dev,
			     struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "%d\n", 70 * 1000);
}

static ssize_t show_temp_crit(struct device *dev,
			      struct device_attribute *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	int show_hyst = attr->index;
	u32 regval;
	int value;

	pci_read_config_dword(to_pci_dev(dev),
			      REG_HARDWARE_THERMAL_CONTROL, &regval);
	value = ((regval >> 16) & 0x7f) * 500 + 52000;
	if (show_hyst)
		value -= ((regval >> 24) & 0xf) * 500;
	return sprintf(buf, "%d\n", value);
}

static ssize_t show_name(struct device *dev,
			 struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "k10temp\n");
}

static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
static DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max, NULL);
static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, show_temp_crit, NULL, 1);
static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);

static bool __devinit has_erratum_319(struct pci_dev *pdev)
{
	u32 pkg_type, reg_dram_cfg;

	if (boot_cpu_data.x86 != 0x10)
		return false;

	/*
	 * Erratum 319: The thermal sensor of Socket F/AM2+ processors
	 *              may be unreliable.
	 */
	pkg_type = cpuid_ebx(0x80000001) & CPUID_PKGTYPE_MASK;
	if (pkg_type == CPUID_PKGTYPE_F)
		return true;
	if (pkg_type != CPUID_PKGTYPE_AM2R2_AM3)
		return false;

	/* DDR3 memory implies socket AM3, which is good */
	pci_bus_read_config_dword(pdev->bus,
				  PCI_DEVFN(PCI_SLOT(pdev->devfn), 2),
				  REG_DCT0_CONFIG_HIGH, &reg_dram_cfg);
	if (reg_dram_cfg & DDR3_MODE)
		return false;

	/*
	 * Unfortunately it is possible to run a socket AM3 CPU with DDR2
	 * memory. We blacklist all the cores which do exist in socket AM2+
	 * format. It still isn't perfect, as RB-C2 cores exist in both AM2+
	 * and AM3 formats, but that's the best we can do.
	 */
	return boot_cpu_data.x86_model < 4 ||
	       (boot_cpu_data.x86_model == 4 && boot_cpu_data.x86_mask <= 2);
}

static int __devinit k10temp_probe(struct pci_dev *pdev,
				   const struct pci_device_id *id)
{
	struct device *hwmon_dev;
	u32 reg_caps, reg_htc;
	int unreliable = has_erratum_319(pdev);
	int err;

	if (unreliable && !force) {
		dev_err(&pdev->dev,
			"unreliable CPU thermal sensor; monitoring disabled\n");
		err = -ENODEV;
		goto exit;
	}

	err = device_create_file(&pdev->dev, &dev_attr_temp1_input);
	if (err)
		goto exit;
	err = device_create_file(&pdev->dev, &dev_attr_temp1_max);
	if (err)
		goto exit_remove;

	pci_read_config_dword(pdev, REG_NORTHBRIDGE_CAPABILITIES, &reg_caps);
	pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, &reg_htc);
	if ((reg_caps & NB_CAP_HTC) && (reg_htc & HTC_ENABLE)) {
		err = device_create_file(&pdev->dev,
				&sensor_dev_attr_temp1_crit.dev_attr);
		if (err)
			goto exit_remove;
		err = device_create_file(&pdev->dev,
				&sensor_dev_attr_temp1_crit_hyst.dev_attr);
		if (err)
			goto exit_remove;
	}

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

	hwmon_dev = hwmon_device_register(&pdev->dev);
	if (IS_ERR(hwmon_dev)) {
		err = PTR_ERR(hwmon_dev);
		goto exit_remove;
	}
	pci_set_drvdata(pdev, hwmon_dev);

	if (unreliable && force)
		dev_warn(&pdev->dev,
			 "unreliable CPU thermal sensor; check erratum 319\n");
	return 0;

exit_remove:
	device_remove_file(&pdev->dev, &dev_attr_name);
	device_remove_file(&pdev->dev, &dev_attr_temp1_input);
	device_remove_file(&pdev->dev, &dev_attr_temp1_max);
	device_remove_file(&pdev->dev,
			   &sensor_dev_attr_temp1_crit.dev_attr);
	device_remove_file(&pdev->dev,
			   &sensor_dev_attr_temp1_crit_hyst.dev_attr);
exit:
	return err;
}

static void __devexit k10temp_remove(struct pci_dev *pdev)
{
	hwmon_device_unregister(pci_get_drvdata(pdev));
	device_remove_file(&pdev->dev, &dev_attr_name);
	device_remove_file(&pdev->dev, &dev_attr_temp1_input);
	device_remove_file(&pdev->dev, &dev_attr_temp1_max);
	device_remove_file(&pdev->dev,
			   &sensor_dev_attr_temp1_crit.dev_attr);
	device_remove_file(&pdev->dev,
			   &sensor_dev_attr_temp1_crit_hyst.dev_attr);
	pci_set_drvdata(pdev, NULL);
}

static DEFINE_PCI_DEVICE_TABLE(k10temp_id_table) = {
	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_11H_NB_MISC) },
	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CNB17H_F3) },
	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) },
	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M10H_F3) },
	{}
};
MODULE_DEVICE_TABLE(pci, k10temp_id_table);

static struct pci_driver k10temp_driver = {
	.name = "k10temp",
	.id_table = k10temp_id_table,
	.probe = k10temp_probe,
	.remove = k10temp_remove,
};

module_pci_driver(k10temp_driver);