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1/*
2 * k10temp.c - AMD Family 10h/11h/12h/14h/15h 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+ 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 /* DDR3 memory implies socket AM3, which is 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 if (reg_dram_cfg & DDR3_MODE)
120 return false;
121
122 /*
123 * Unfortunately it is possible to run a socket AM3 CPU with DDR2
124 * memory. We blacklist all the cores which do exist in socket AM2+
125 * format. It still isn't perfect, as RB-C2 cores exist in both AM2+
126 * and AM3 formats, but that's the best we can do.
127 */
128 return boot_cpu_data.x86_model < 4 ||
129 (boot_cpu_data.x86_model == 4 && boot_cpu_data.x86_mask <= 2);
130}
131
132static int __devinit k10temp_probe(struct pci_dev *pdev,
133 const struct pci_device_id *id)
134{
135 struct device *hwmon_dev;
136 u32 reg_caps, reg_htc;
137 int unreliable = has_erratum_319(pdev);
138 int err;
139
140 if (unreliable && !force) {
141 dev_err(&pdev->dev,
142 "unreliable CPU thermal sensor; monitoring disabled\n");
143 err = -ENODEV;
144 goto exit;
145 }
146
147 err = device_create_file(&pdev->dev, &dev_attr_temp1_input);
148 if (err)
149 goto exit;
150 err = device_create_file(&pdev->dev, &dev_attr_temp1_max);
151 if (err)
152 goto exit_remove;
153
154 pci_read_config_dword(pdev, REG_NORTHBRIDGE_CAPABILITIES, ®_caps);
155 pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, ®_htc);
156 if ((reg_caps & NB_CAP_HTC) && (reg_htc & HTC_ENABLE)) {
157 err = device_create_file(&pdev->dev,
158 &sensor_dev_attr_temp1_crit.dev_attr);
159 if (err)
160 goto exit_remove;
161 err = device_create_file(&pdev->dev,
162 &sensor_dev_attr_temp1_crit_hyst.dev_attr);
163 if (err)
164 goto exit_remove;
165 }
166
167 err = device_create_file(&pdev->dev, &dev_attr_name);
168 if (err)
169 goto exit_remove;
170
171 hwmon_dev = hwmon_device_register(&pdev->dev);
172 if (IS_ERR(hwmon_dev)) {
173 err = PTR_ERR(hwmon_dev);
174 goto exit_remove;
175 }
176 pci_set_drvdata(pdev, hwmon_dev);
177
178 if (unreliable && force)
179 dev_warn(&pdev->dev,
180 "unreliable CPU thermal sensor; check erratum 319\n");
181 return 0;
182
183exit_remove:
184 device_remove_file(&pdev->dev, &dev_attr_name);
185 device_remove_file(&pdev->dev, &dev_attr_temp1_input);
186 device_remove_file(&pdev->dev, &dev_attr_temp1_max);
187 device_remove_file(&pdev->dev,
188 &sensor_dev_attr_temp1_crit.dev_attr);
189 device_remove_file(&pdev->dev,
190 &sensor_dev_attr_temp1_crit_hyst.dev_attr);
191exit:
192 return err;
193}
194
195static void __devexit k10temp_remove(struct pci_dev *pdev)
196{
197 hwmon_device_unregister(pci_get_drvdata(pdev));
198 device_remove_file(&pdev->dev, &dev_attr_name);
199 device_remove_file(&pdev->dev, &dev_attr_temp1_input);
200 device_remove_file(&pdev->dev, &dev_attr_temp1_max);
201 device_remove_file(&pdev->dev,
202 &sensor_dev_attr_temp1_crit.dev_attr);
203 device_remove_file(&pdev->dev,
204 &sensor_dev_attr_temp1_crit_hyst.dev_attr);
205 pci_set_drvdata(pdev, NULL);
206}
207
208static const struct pci_device_id k10temp_id_table[] = {
209 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
210 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_11H_NB_MISC) },
211 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CNB17H_F3) },
212 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) },
213 {}
214};
215MODULE_DEVICE_TABLE(pci, k10temp_id_table);
216
217static struct pci_driver k10temp_driver = {
218 .name = "k10temp",
219 .id_table = k10temp_id_table,
220 .probe = k10temp_probe,
221 .remove = __devexit_p(k10temp_remove),
222};
223
224static int __init k10temp_init(void)
225{
226 return pci_register_driver(&k10temp_driver);
227}
228
229static void __exit k10temp_exit(void)
230{
231 pci_unregister_driver(&k10temp_driver);
232}
233
234module_init(k10temp_init)
235module_exit(k10temp_exit)
1/*
2 * k10temp.c - AMD Family 10h/11h/12h/14h/15h/16h 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+ 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 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 /* DDR3 memory implies socket AM3, which is 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 if (reg_dram_cfg & DDR3_MODE)
120 return false;
121
122 /*
123 * Unfortunately it is possible to run a socket AM3 CPU with DDR2
124 * memory. We blacklist all the cores which do exist in socket AM2+
125 * format. It still isn't perfect, as RB-C2 cores exist in both AM2+
126 * and AM3 formats, but that's the best we can do.
127 */
128 return boot_cpu_data.x86_model < 4 ||
129 (boot_cpu_data.x86_model == 4 && boot_cpu_data.x86_mask <= 2);
130}
131
132static int k10temp_probe(struct pci_dev *pdev,
133 const struct pci_device_id *id)
134{
135 struct device *hwmon_dev;
136 u32 reg_caps, reg_htc;
137 int unreliable = has_erratum_319(pdev);
138 int err;
139
140 if (unreliable && !force) {
141 dev_err(&pdev->dev,
142 "unreliable CPU thermal sensor; monitoring disabled\n");
143 err = -ENODEV;
144 goto exit;
145 }
146
147 err = device_create_file(&pdev->dev, &dev_attr_temp1_input);
148 if (err)
149 goto exit;
150 err = device_create_file(&pdev->dev, &dev_attr_temp1_max);
151 if (err)
152 goto exit_remove;
153
154 pci_read_config_dword(pdev, REG_NORTHBRIDGE_CAPABILITIES, ®_caps);
155 pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, ®_htc);
156 if ((reg_caps & NB_CAP_HTC) && (reg_htc & HTC_ENABLE)) {
157 err = device_create_file(&pdev->dev,
158 &sensor_dev_attr_temp1_crit.dev_attr);
159 if (err)
160 goto exit_remove;
161 err = device_create_file(&pdev->dev,
162 &sensor_dev_attr_temp1_crit_hyst.dev_attr);
163 if (err)
164 goto exit_remove;
165 }
166
167 err = device_create_file(&pdev->dev, &dev_attr_name);
168 if (err)
169 goto exit_remove;
170
171 hwmon_dev = hwmon_device_register(&pdev->dev);
172 if (IS_ERR(hwmon_dev)) {
173 err = PTR_ERR(hwmon_dev);
174 goto exit_remove;
175 }
176 pci_set_drvdata(pdev, hwmon_dev);
177
178 if (unreliable && force)
179 dev_warn(&pdev->dev,
180 "unreliable CPU thermal sensor; check erratum 319\n");
181 return 0;
182
183exit_remove:
184 device_remove_file(&pdev->dev, &dev_attr_name);
185 device_remove_file(&pdev->dev, &dev_attr_temp1_input);
186 device_remove_file(&pdev->dev, &dev_attr_temp1_max);
187 device_remove_file(&pdev->dev,
188 &sensor_dev_attr_temp1_crit.dev_attr);
189 device_remove_file(&pdev->dev,
190 &sensor_dev_attr_temp1_crit_hyst.dev_attr);
191exit:
192 return err;
193}
194
195static void k10temp_remove(struct pci_dev *pdev)
196{
197 hwmon_device_unregister(pci_get_drvdata(pdev));
198 device_remove_file(&pdev->dev, &dev_attr_name);
199 device_remove_file(&pdev->dev, &dev_attr_temp1_input);
200 device_remove_file(&pdev->dev, &dev_attr_temp1_max);
201 device_remove_file(&pdev->dev,
202 &sensor_dev_attr_temp1_crit.dev_attr);
203 device_remove_file(&pdev->dev,
204 &sensor_dev_attr_temp1_crit_hyst.dev_attr);
205}
206
207static const struct pci_device_id k10temp_id_table[] = {
208 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
209 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_11H_NB_MISC) },
210 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CNB17H_F3) },
211 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) },
212 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M10H_F3) },
213 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F3) },
214 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_NB_F3) },
215 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F3) },
216 {}
217};
218MODULE_DEVICE_TABLE(pci, k10temp_id_table);
219
220static struct pci_driver k10temp_driver = {
221 .name = "k10temp",
222 .id_table = k10temp_id_table,
223 .probe = k10temp_probe,
224 .remove = k10temp_remove,
225};
226
227module_pci_driver(k10temp_driver);