2 * k10temp.c - AMD Family 10h/11h/12h/14h processor hardware monitoring
4 * Copyright (c) 2009 Clemens Ladisch <clemens@ladisch.de>
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.
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.
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/>.
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>
28 MODULE_DESCRIPTION("AMD Family 10h/11h/12h/14h CPU core temperature monitor");
29 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
30 MODULE_LICENSE("GPL");
33 module_param(force, bool, 0444);
34 MODULE_PARM_DESC(force, "force loading on processors with erratum 319");
36 /* CPUID function 0x80000001, ebx */
37 #define CPUID_PKGTYPE_MASK 0xf0000000
38 #define CPUID_PKGTYPE_F 0x00000000
39 #define CPUID_PKGTYPE_AM2R2_AM3 0x10000000
41 /* DRAM controller (PCI function 2) */
42 #define REG_DCT0_CONFIG_HIGH 0x094
43 #define DDR3_MODE 0x00000100
45 /* miscellaneous (PCI function 3) */
46 #define REG_HARDWARE_THERMAL_CONTROL 0x64
47 #define HTC_ENABLE 0x00000001
49 #define REG_REPORTED_TEMPERATURE 0xa4
51 #define REG_NORTHBRIDGE_CAPABILITIES 0xe8
52 #define NB_CAP_HTC 0x00000400
54 static ssize_t show_temp(struct device *dev,
55 struct device_attribute *attr, char *buf)
59 pci_read_config_dword(to_pci_dev(dev),
60 REG_REPORTED_TEMPERATURE, ®val);
61 return sprintf(buf, "%u\n", (regval >> 21) * 125);
64 static ssize_t show_temp_max(struct device *dev,
65 struct device_attribute *attr, char *buf)
67 return sprintf(buf, "%d\n", 70 * 1000);
70 static ssize_t show_temp_crit(struct device *dev,
71 struct device_attribute *devattr, char *buf)
73 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
74 int show_hyst = attr->index;
78 pci_read_config_dword(to_pci_dev(dev),
79 REG_HARDWARE_THERMAL_CONTROL, ®val);
80 value = ((regval >> 16) & 0x7f) * 500 + 52000;
82 value -= ((regval >> 24) & 0xf) * 500;
83 return sprintf(buf, "%d\n", value);
86 static ssize_t show_name(struct device *dev,
87 struct device_attribute *attr, char *buf)
89 return sprintf(buf, "k10temp\n");
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);
98 static bool __devinit has_erratum_319(struct pci_dev *pdev)
100 u32 pkg_type, reg_dram_cfg;
102 if (boot_cpu_data.x86 != 0x10)
106 * Erratum 319: The thermal sensor of Socket F/AM2+ processors
109 pkg_type = cpuid_ebx(0x80000001) & CPUID_PKGTYPE_MASK;
110 if (pkg_type == CPUID_PKGTYPE_F)
112 if (pkg_type != CPUID_PKGTYPE_AM2R2_AM3)
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)
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.
128 return boot_cpu_data.x86_model < 4 ||
129 (boot_cpu_data.x86_model == 4 && boot_cpu_data.x86_mask <= 2);
132 static int __devinit k10temp_probe(struct pci_dev *pdev,
133 const struct pci_device_id *id)
135 struct device *hwmon_dev;
136 u32 reg_caps, reg_htc;
137 int unreliable = has_erratum_319(pdev);
140 if (unreliable && !force) {
142 "unreliable CPU thermal sensor; monitoring disabled\n");
147 err = device_create_file(&pdev->dev, &dev_attr_temp1_input);
150 err = device_create_file(&pdev->dev, &dev_attr_temp1_max);
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);
161 err = device_create_file(&pdev->dev,
162 &sensor_dev_attr_temp1_crit_hyst.dev_attr);
167 err = device_create_file(&pdev->dev, &dev_attr_name);
171 hwmon_dev = hwmon_device_register(&pdev->dev);
172 if (IS_ERR(hwmon_dev)) {
173 err = PTR_ERR(hwmon_dev);
176 pci_set_drvdata(pdev, hwmon_dev);
178 if (unreliable && force)
180 "unreliable CPU thermal sensor; check erratum 319\n");
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);
195 static void __devexit k10temp_remove(struct pci_dev *pdev)
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);
208 static 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) },
214 MODULE_DEVICE_TABLE(pci, k10temp_id_table);
216 static struct pci_driver k10temp_driver = {
218 .id_table = k10temp_id_table,
219 .probe = k10temp_probe,
220 .remove = __devexit_p(k10temp_remove),
223 static int __init k10temp_init(void)
225 return pci_register_driver(&k10temp_driver);
228 static void __exit k10temp_exit(void)
230 pci_unregister_driver(&k10temp_driver);
233 module_init(k10temp_init)
234 module_exit(k10temp_exit)