/drivers/hwmon/k10temp.c
C | 223 lines | 164 code | 33 blank | 26 comment | 19 complexity | b47274c666cfa90a1a6feebd08c00e19 MD5 | raw file
Possible License(s): CC-BY-SA-3.0, GPL-2.0, LGPL-2.0, AGPL-1.0
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/* CPUID function 0x80000001, ebx */
37#define CPUID_PKGTYPE_MASK 0xf0000000
38#define CPUID_PKGTYPE_F 0x00000000
39#define CPUID_PKGTYPE_AM2R2_AM3 0x10000000
40
41/* DRAM controller (PCI function 2) */
42#define REG_DCT0_CONFIG_HIGH 0x094
43#define DDR3_MODE 0x00000100
44
45/* miscellaneous (PCI function 3) */
46#define REG_HARDWARE_THERMAL_CONTROL 0x64
47#define HTC_ENABLE 0x00000001
48
49#define REG_REPORTED_TEMPERATURE 0xa4
50
51#define REG_NORTHBRIDGE_CAPABILITIES 0xe8
52#define NB_CAP_HTC 0x00000400
53
54static ssize_t show_temp(struct device *dev,
55 struct device_attribute *attr, char *buf)
56{
57 u32 regval;
58
59 pci_read_config_dword(to_pci_dev(dev),
60 REG_REPORTED_TEMPERATURE, ®val);
61 return sprintf(buf, "%u\n", (regval >> 21) * 125);
62}
63
64static ssize_t show_temp_max(struct device *dev,
65 struct device_attribute *attr, char *buf)
66{
67 return sprintf(buf, "%d\n", 70 * 1000);
68}
69
70static ssize_t show_temp_crit(struct device *dev,
71 struct device_attribute *devattr, char *buf)
72{
73 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
74 int show_hyst = attr->index;
75 u32 regval;
76 int value;
77
78 pci_read_config_dword(to_pci_dev(dev),
79 REG_HARDWARE_THERMAL_CONTROL, ®val);
80 value = ((regval >> 16) & 0x7f) * 500 + 52000;
81 if (show_hyst)
82 value -= ((regval >> 24) & 0xf) * 500;
83 return sprintf(buf, "%d\n", value);
84}
85
86static ssize_t show_name(struct device *dev,
87 struct device_attribute *attr, char *buf)
88{
89 return sprintf(buf, "k10temp\n");
90}
91
92static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
93static DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max, NULL);
94static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0);
95static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, show_temp_crit, NULL, 1);
96static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
97
98static bool __devinit has_erratum_319(struct pci_dev *pdev)
99{
100 u32 pkg_type, reg_dram_cfg;
101
102 if (boot_cpu_data.x86 != 0x10)
103 return false;
104
105 /*
106 * Erratum 319: The thermal sensor of Socket F/AM2+ processors
107 * may be unreliable.
108 */
109 pkg_type = cpuid_ebx(0x80000001) & CPUID_PKGTYPE_MASK;
110 if (pkg_type == CPUID_PKGTYPE_F)
111 return true;
112 if (pkg_type != CPUID_PKGTYPE_AM2R2_AM3)
113 return false;
114
115 /* Differentiate between AM2+ (bad) and AM3 (good) */
116 pci_bus_read_config_dword(pdev->bus,
117 PCI_DEVFN(PCI_SLOT(pdev->devfn), 2),
118 REG_DCT0_CONFIG_HIGH, ®_dram_cfg);
119 return !(reg_dram_cfg & DDR3_MODE);
120}
121
122static int __devinit k10temp_probe(struct pci_dev *pdev,
123 const struct pci_device_id *id)
124{
125 struct device *hwmon_dev;
126 u32 reg_caps, reg_htc;
127 int unreliable = has_erratum_319(pdev);
128 int err;
129
130 if (unreliable && !force) {
131 dev_err(&pdev->dev,
132 "unreliable CPU thermal sensor; monitoring disabled\n");
133 err = -ENODEV;
134 goto exit;
135 }
136
137 err = device_create_file(&pdev->dev, &dev_attr_temp1_input);
138 if (err)
139 goto exit;
140 err = device_create_file(&pdev->dev, &dev_attr_temp1_max);
141 if (err)
142 goto exit_remove;
143
144 pci_read_config_dword(pdev, REG_NORTHBRIDGE_CAPABILITIES, ®_caps);
145 pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, ®_htc);
146 if ((reg_caps & NB_CAP_HTC) && (reg_htc & HTC_ENABLE)) {
147 err = device_create_file(&pdev->dev,
148 &sensor_dev_attr_temp1_crit.dev_attr);
149 if (err)
150 goto exit_remove;
151 err = device_create_file(&pdev->dev,
152 &sensor_dev_attr_temp1_crit_hyst.dev_attr);
153 if (err)
154 goto exit_remove;
155 }
156
157 err = device_create_file(&pdev->dev, &dev_attr_name);
158 if (err)
159 goto exit_remove;
160
161 hwmon_dev = hwmon_device_register(&pdev->dev);
162 if (IS_ERR(hwmon_dev)) {
163 err = PTR_ERR(hwmon_dev);
164 goto exit_remove;
165 }
166 dev_set_drvdata(&pdev->dev, hwmon_dev);
167
168 if (unreliable && force)
169 dev_warn(&pdev->dev,
170 "unreliable CPU thermal sensor; check erratum 319\n");
171 return 0;
172
173exit_remove:
174 device_remove_file(&pdev->dev, &dev_attr_name);
175 device_remove_file(&pdev->dev, &dev_attr_temp1_input);
176 device_remove_file(&pdev->dev, &dev_attr_temp1_max);
177 device_remove_file(&pdev->dev,
178 &sensor_dev_attr_temp1_crit.dev_attr);
179 device_remove_file(&pdev->dev,
180 &sensor_dev_attr_temp1_crit_hyst.dev_attr);
181exit:
182 return err;
183}
184
185static void __devexit k10temp_remove(struct pci_dev *pdev)
186{
187 hwmon_device_unregister(dev_get_drvdata(&pdev->dev));
188 device_remove_file(&pdev->dev, &dev_attr_name);
189 device_remove_file(&pdev->dev, &dev_attr_temp1_input);
190 device_remove_file(&pdev->dev, &dev_attr_temp1_max);
191 device_remove_file(&pdev->dev,
192 &sensor_dev_attr_temp1_crit.dev_attr);
193 device_remove_file(&pdev->dev,
194 &sensor_dev_attr_temp1_crit_hyst.dev_attr);
195 dev_set_drvdata(&pdev->dev, NULL);
196}
197
198static const struct pci_device_id k10temp_id_table[] = {
199 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
200 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_11H_NB_MISC) },
201 {}
202};
203MODULE_DEVICE_TABLE(pci, k10temp_id_table);
204
205static struct pci_driver k10temp_driver = {
206 .name = "k10temp",
207 .id_table = k10temp_id_table,
208 .probe = k10temp_probe,
209 .remove = __devexit_p(k10temp_remove),
210};
211
212static int __init k10temp_init(void)
213{
214 return pci_register_driver(&k10temp_driver);
215}
216
217static void __exit k10temp_exit(void)
218{
219 pci_unregister_driver(&k10temp_driver);
220}
221
222module_init(k10temp_init)
223module_exit(k10temp_exit)