hwmon: (lm90) Restore configuration on exit
[linux-2.6.git] / drivers / hwmon / k10temp.c
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
28 MODULE_DESCRIPTION("AMD Family 10h/11h CPU core temperature monitor");
29 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
30 MODULE_LICENSE("GPL");
31
32 static bool force;
33 module_param(force, bool, 0444);
34 MODULE_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
54 static 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, &regval);
61         return sprintf(buf, "%u\n", (regval >> 21) * 125);
62 }
63
64 static 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
70 static 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, &regval);
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
86 static ssize_t show_name(struct device *dev,
87                          struct device_attribute *attr, char *buf)
88 {
89         return sprintf(buf, "k10temp\n");
90 }
91
92 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
93 static DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max, NULL);
94 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0);
95 static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, show_temp_crit, NULL, 1);
96 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
97
98 static 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, &reg_dram_cfg);
119         return !(reg_dram_cfg & DDR3_MODE);
120 }
121
122 static 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, &reg_caps);
145         pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, &reg_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
173 exit_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);
181 exit:
182         return err;
183 }
184
185 static 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
198 static 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 };
203 MODULE_DEVICE_TABLE(pci, k10temp_id_table);
204
205 static 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
212 static int __init k10temp_init(void)
213 {
214         return pci_register_driver(&k10temp_driver);
215 }
216
217 static void __exit k10temp_exit(void)
218 {
219         pci_unregister_driver(&k10temp_driver);
220 }
221
222 module_init(k10temp_init)
223 module_exit(k10temp_exit)