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Diffstat (limited to 'drivers/hwmon/k10temp.c')
-rw-r--r--drivers/hwmon/k10temp.c197
1 files changed, 197 insertions, 0 deletions
diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
new file mode 100644
index 000000000000..d8a26d16d948
--- /dev/null
+++ b/drivers/hwmon/k10temp.c
@@ -0,0 +1,197 @@
1/*
2 * k10temp.c - AMD Family 10h/11h processor hardware monitoring
3 *
4 * Copyright (c) 2009 Clemens Ladisch <clemens@ladisch.de>
5 *
6 *
7 * This driver is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This driver is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
14 * See the GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this driver; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20#include <linux/err.h>
21#include <linux/hwmon.h>
22#include <linux/hwmon-sysfs.h>
23#include <linux/init.h>
24#include <linux/module.h>
25#include <linux/pci.h>
26#include <asm/processor.h>
27
28MODULE_DESCRIPTION("AMD Family 10h/11h CPU core temperature monitor");
29MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
30MODULE_LICENSE("GPL");
31
32static bool force;
33module_param(force, bool, 0444);
34MODULE_PARM_DESC(force, "force loading on processors with erratum 319");
35
36#define REG_HARDWARE_THERMAL_CONTROL 0x64
37#define HTC_ENABLE 0x00000001
38
39#define REG_REPORTED_TEMPERATURE 0xa4
40
41#define REG_NORTHBRIDGE_CAPABILITIES 0xe8
42#define NB_CAP_HTC 0x00000400
43
44static ssize_t show_temp(struct device *dev,
45 struct device_attribute *attr, char *buf)
46{
47 u32 regval;
48
49 pci_read_config_dword(to_pci_dev(dev),
50 REG_REPORTED_TEMPERATURE, &regval);
51 return sprintf(buf, "%u\n", (regval >> 21) * 125);
52}
53
54static ssize_t show_temp_max(struct device *dev,
55 struct device_attribute *attr, char *buf)
56{
57 return sprintf(buf, "%d\n", 70 * 1000);
58}
59
60static ssize_t show_temp_crit(struct device *dev,
61 struct device_attribute *devattr, char *buf)
62{
63 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
64 int show_hyst = attr->index;
65 u32 regval;
66 int value;
67
68 pci_read_config_dword(to_pci_dev(dev),
69 REG_HARDWARE_THERMAL_CONTROL, &regval);
70 value = ((regval >> 16) & 0x7f) * 500 + 52000;
71 if (show_hyst)
72 value -= ((regval >> 24) & 0xf) * 500;
73 return sprintf(buf, "%d\n", value);
74}
75
76static ssize_t show_name(struct device *dev,
77 struct device_attribute *attr, char *buf)
78{
79 return sprintf(buf, "k10temp\n");
80}
81
82static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
83static DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max, NULL);
84static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0);
85static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, show_temp_crit, NULL, 1);
86static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
87
88static bool __devinit has_erratum_319(void)
89{
90 /*
91 * Erratum 319: The thermal sensor of older Family 10h processors
92 * (B steppings) may be unreliable.
93 */
94 return boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model <= 2;
95}
96
97static int __devinit k10temp_probe(struct pci_dev *pdev,
98 const struct pci_device_id *id)
99{
100 struct device *hwmon_dev;
101 u32 reg_caps, reg_htc;
102 int err;
103
104 if (has_erratum_319() && !force) {
105 dev_err(&pdev->dev,
106 "unreliable CPU thermal sensor; monitoring disabled\n");
107 err = -ENODEV;
108 goto exit;
109 }
110
111 err = device_create_file(&pdev->dev, &dev_attr_temp1_input);
112 if (err)
113 goto exit;
114 err = device_create_file(&pdev->dev, &dev_attr_temp1_max);
115 if (err)
116 goto exit_remove;
117
118 pci_read_config_dword(pdev, REG_NORTHBRIDGE_CAPABILITIES, &reg_caps);
119 pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, &reg_htc);
120 if ((reg_caps & NB_CAP_HTC) && (reg_htc & HTC_ENABLE)) {
121 err = device_create_file(&pdev->dev,
122 &sensor_dev_attr_temp1_crit.dev_attr);
123 if (err)
124 goto exit_remove;
125 err = device_create_file(&pdev->dev,
126 &sensor_dev_attr_temp1_crit_hyst.dev_attr);
127 if (err)
128 goto exit_remove;
129 }
130
131 err = device_create_file(&pdev->dev, &dev_attr_name);
132 if (err)
133 goto exit_remove;
134
135 hwmon_dev = hwmon_device_register(&pdev->dev);
136 if (IS_ERR(hwmon_dev)) {
137 err = PTR_ERR(hwmon_dev);
138 goto exit_remove;
139 }
140 dev_set_drvdata(&pdev->dev, hwmon_dev);
141
142 if (has_erratum_319() && force)
143 dev_warn(&pdev->dev,
144 "unreliable CPU thermal sensor; check erratum 319\n");
145 return 0;
146
147exit_remove:
148 device_remove_file(&pdev->dev, &dev_attr_name);
149 device_remove_file(&pdev->dev, &dev_attr_temp1_input);
150 device_remove_file(&pdev->dev, &dev_attr_temp1_max);
151 device_remove_file(&pdev->dev,
152 &sensor_dev_attr_temp1_crit.dev_attr);
153 device_remove_file(&pdev->dev,
154 &sensor_dev_attr_temp1_crit_hyst.dev_attr);
155exit:
156 return err;
157}
158
159static void __devexit k10temp_remove(struct pci_dev *pdev)
160{
161 hwmon_device_unregister(dev_get_drvdata(&pdev->dev));
162 device_remove_file(&pdev->dev, &dev_attr_name);
163 device_remove_file(&pdev->dev, &dev_attr_temp1_input);
164 device_remove_file(&pdev->dev, &dev_attr_temp1_max);
165 device_remove_file(&pdev->dev,
166 &sensor_dev_attr_temp1_crit.dev_attr);
167 device_remove_file(&pdev->dev,
168 &sensor_dev_attr_temp1_crit_hyst.dev_attr);
169 dev_set_drvdata(&pdev->dev, NULL);
170}
171
172static struct pci_device_id k10temp_id_table[] = {
173 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
174 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_11H_NB_MISC) },
175 {}
176};
177MODULE_DEVICE_TABLE(pci, k10temp_id_table);
178
179static struct pci_driver k10temp_driver = {
180 .name = "k10temp",
181 .id_table = k10temp_id_table,
182 .probe = k10temp_probe,
183 .remove = __devexit_p(k10temp_remove),
184};
185
186static int __init k10temp_init(void)
187{
188 return pci_register_driver(&k10temp_driver);
189}
190
191static void __exit k10temp_exit(void)
192{
193 pci_unregister_driver(&k10temp_driver);
194}
195
196module_init(k10temp_init)
197module_exit(k10temp_exit)
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-29 04:27:51 -0500