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         /* 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, &reg_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
 132 static 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, &reg_caps);
 155         pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, &reg_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         dev_set_drvdata(&pdev->dev, 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
 183 exit_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);
 191 exit:
 192         return err;
 193 }
 194
 195 static void __devexit k10temp_remove(struct pci_dev *pdev)
 196 {
 197         hwmon_device_unregister(dev_get_drvdata(&pdev->dev));
 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         dev_set_drvdata(&pdev->dev, NULL);
 206 }
 207
 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         {}
 212 };
 213 MODULE_DEVICE_TABLE(pci, k10temp_id_table);
 214
 215 static struct pci_driver k10temp_driver = {
 216         .name = "k10temp",
 217         .id_table = k10temp_id_table,
 218         .probe = k10temp_probe,
 219         .remove = __devexit_p(k10temp_remove),
 220 };
 221
 222 static int __init k10temp_init(void)
 223 {
 224         return pci_register_driver(&k10temp_driver);
 225 }
 226
 227 static void __exit k10temp_exit(void)
 228 {
 229         pci_unregister_driver(&k10temp_driver);
 230 }
 231
 232 module_init(k10temp_init)
 233 module_exit(k10temp_exit)