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 #define REG_HARDWARE_THERMAL_CONTROL    0x64
  37 #define  HTC_ENABLE                     0x00000001
  38
  39 #define REG_REPORTED_TEMPERATURE        0xa4
  40
  41 #define REG_NORTHBRIDGE_CAPABILITIES    0xe8
  42 #define  NB_CAP_HTC                     0x00000400
  43
  44 static ssize_t show_temp(struct device *dev,
  45                          struct device_attribute *attr, char *buf)
  46 {
  47         u32 regval;
  48
  49         pci_read_config_dword(to_pci_dev(dev),
  50                               REG_REPORTED_TEMPERATURE, &regval);
  51         return sprintf(buf, "%u\n", (regval >> 21) * 125);
  52 }
  53
  54 static ssize_t show_temp_max(struct device *dev,
  55                              struct device_attribute *attr, char *buf)
  56 {
  57         return sprintf(buf, "%d\n", 70 * 1000);
  58 }
  59
  60 static ssize_t show_temp_crit(struct device *dev,
  61                               struct device_attribute *devattr, char *buf)
  62 {
  63         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
  64         int show_hyst = attr->index;
  65         u32 regval;
  66         int value;
  67
  68         pci_read_config_dword(to_pci_dev(dev),
  69                               REG_HARDWARE_THERMAL_CONTROL, &regval);
  70         value = ((regval >> 16) & 0x7f) * 500 + 52000;
  71         if (show_hyst)
  72                 value -= ((regval >> 24) & 0xf) * 500;
  73         return sprintf(buf, "%d\n", value);
  74 }
  75
  76 static ssize_t show_name(struct device *dev,
  77                          struct device_attribute *attr, char *buf)
  78 {
  79         return sprintf(buf, "k10temp\n");
  80 }
  81
  82 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
  83 static DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max, NULL);
  84 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0);
  85 static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, show_temp_crit, NULL, 1);
  86 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
  87
  88 static bool __devinit has_erratum_319(void)
  89 {
  90         /*
  91          * Erratum 319: The thermal sensor of older Family 10h processors
  92          *              (B steppings) may be unreliable.
  93          */
  94         return boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model <= 2;
  95 }
  96
  97 static int __devinit k10temp_probe(struct pci_dev *pdev,
  98                                    const struct pci_device_id *id)
  99 {
 100         struct device *hwmon_dev;
 101         u32 reg_caps, reg_htc;
 102         int err;
 103
 104         if (has_erratum_319() && !force) {
 105                 dev_err(&pdev->dev,
 106                         "unreliable CPU thermal sensor; monitoring disabled\n");
 107                 err = -ENODEV;
 108                 goto exit;
 109         }
 110
 111         err = device_create_file(&pdev->dev, &dev_attr_temp1_input);
 112         if (err)
 113                 goto exit;
 114         err = device_create_file(&pdev->dev, &dev_attr_temp1_max);
 115         if (err)
 116                 goto exit_remove;
 117
 118         pci_read_config_dword(pdev, REG_NORTHBRIDGE_CAPABILITIES, &reg_caps);
 119         pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, &reg_htc);
 120         if ((reg_caps & NB_CAP_HTC) && (reg_htc & HTC_ENABLE)) {
 121                 err = device_create_file(&pdev->dev,
 122                                 &sensor_dev_attr_temp1_crit.dev_attr);
 123                 if (err)
 124                         goto exit_remove;
 125                 err = device_create_file(&pdev->dev,
 126                                 &sensor_dev_attr_temp1_crit_hyst.dev_attr);
 127                 if (err)
 128                         goto exit_remove;
 129         }
 130
 131         err = device_create_file(&pdev->dev, &dev_attr_name);
 132         if (err)
 133                 goto exit_remove;
 134
 135         hwmon_dev = hwmon_device_register(&pdev->dev);
 136         if (IS_ERR(hwmon_dev)) {
 137                 err = PTR_ERR(hwmon_dev);
 138                 goto exit_remove;
 139         }
 140         dev_set_drvdata(&pdev->dev, hwmon_dev);
 141
 142         if (has_erratum_319() && force)
 143                 dev_warn(&pdev->dev,
 144                          "unreliable CPU thermal sensor; check erratum 319\n");
 145         return 0;
 146
 147 exit_remove:
 148         device_remove_file(&pdev->dev, &dev_attr_name);
 149         device_remove_file(&pdev->dev, &dev_attr_temp1_input);
 150         device_remove_file(&pdev->dev, &dev_attr_temp1_max);
 151         device_remove_file(&pdev->dev,
 152                            &sensor_dev_attr_temp1_crit.dev_attr);
 153         device_remove_file(&pdev->dev,
 154                            &sensor_dev_attr_temp1_crit_hyst.dev_attr);
 155 exit:
 156         return err;
 157 }
 158
 159 static void __devexit k10temp_remove(struct pci_dev *pdev)
 160 {
 161         hwmon_device_unregister(dev_get_drvdata(&pdev->dev));
 162         device_remove_file(&pdev->dev, &dev_attr_name);
 163         device_remove_file(&pdev->dev, &dev_attr_temp1_input);
 164         device_remove_file(&pdev->dev, &dev_attr_temp1_max);
 165         device_remove_file(&pdev->dev,
 166                            &sensor_dev_attr_temp1_crit.dev_attr);
 167         device_remove_file(&pdev->dev,
 168                            &sensor_dev_attr_temp1_crit_hyst.dev_attr);
 169         dev_set_drvdata(&pdev->dev, NULL);
 170 }
 171
 172 static struct pci_device_id k10temp_id_table[] = {
 173         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
 174         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_11H_NB_MISC) },
 175         {}
 176 };
 177 MODULE_DEVICE_TABLE(pci, k10temp_id_table);
 178
 179 static struct pci_driver k10temp_driver = {
 180         .name = "k10temp",
 181         .id_table = k10temp_id_table,
 182         .probe = k10temp_probe,
 183         .remove = __devexit_p(k10temp_remove),
 184 };
 185
 186 static int __init k10temp_init(void)
 187 {
 188         return pci_register_driver(&k10temp_driver);
 189 }
 190
 191 static void __exit k10temp_exit(void)
 192 {
 193         pci_unregister_driver(&k10temp_driver);
 194 }
 195
 196 module_init(k10temp_init)
 197 module_exit(k10temp_exit)