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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, ®val); |
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, ®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 | |
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, ®_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, ®_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 | |
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) |
224 |
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