linux/drivers/hwmon/k10temp.c
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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, &regval);
  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, &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
  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, &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
 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, &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        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        pci_set_drvdata(pdev, NULL);
 206}
 207
 208static DEFINE_PCI_DEVICE_TABLE(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        { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M10H_F3) },
 214        {}
 215};
 216MODULE_DEVICE_TABLE(pci, k10temp_id_table);
 217
 218static struct pci_driver k10temp_driver = {
 219        .name = "k10temp",
 220        .id_table = k10temp_id_table,
 221        .probe = k10temp_probe,
 222        .remove = k10temp_remove,
 223};
 224
 225module_pci_driver(k10temp_driver);
 226
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