drivers/hwmon/k10temp.c

   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
  28 MODULE_DESCRIPTION("AMD Family 10h+ 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 /* Provide lock for writing to NB_SMU_IND_ADDR */
  37 static DEFINE_MUTEX(nb_smu_ind_mutex);
  38
  39 /* CPUID function 0x80000001, ebx */
  40 #define CPUID_PKGTYPE_MASK      0xf0000000
  41 #define CPUID_PKGTYPE_F         0x00000000
  42 #define CPUID_PKGTYPE_AM2R2_AM3 0x10000000
  43
  44 /* DRAM controller (PCI function 2) */
  45 #define REG_DCT0_CONFIG_HIGH            0x094
  46 #define  DDR3_MODE                      0x00000100
  47
  48 /* miscellaneous (PCI function 3) */
  49 #define REG_HARDWARE_THERMAL_CONTROL    0x64
  50 #define  HTC_ENABLE                     0x00000001
  51
  52 #define REG_REPORTED_TEMPERATURE        0xa4
  53
  54 #define REG_NORTHBRIDGE_CAPABILITIES    0xe8
  55 #define  NB_CAP_HTC                     0x00000400
  56
  57 /*
  58  * For F15h M60h, functionality of REG_REPORTED_TEMPERATURE
  59  * has been moved to D0F0xBC_xD820_0CA4 [Reported Temperature
  60  * Control]
  61  */
  62 #define F15H_M60H_REPORTED_TEMP_CTRL_OFFSET     0xd8200ca4
  63 #define PCI_DEVICE_ID_AMD_15H_M60H_NB_F3        0x1573
  64
  65 static void amd_nb_smu_index_read(struct pci_dev *pdev, unsigned int devfn,
  66                                   int offset, u32 *val)
  67 {
  68         mutex_lock(&nb_smu_ind_mutex);
  69         pci_bus_write_config_dword(pdev->bus, devfn,
  70                                    0xb8, offset);
  71         pci_bus_read_config_dword(pdev->bus, devfn,
  72                                   0xbc, val);
  73         mutex_unlock(&nb_smu_ind_mutex);
  74 }
  75
  76 static ssize_t show_temp(struct device *dev,
  77                          struct device_attribute *attr, char *buf)
  78 {
  79         u32 regval;
  80         struct pci_dev *pdev = to_pci_dev(dev);
  81
  82         if (boot_cpu_data.x86 == 0x15 && boot_cpu_data.x86_model == 0x60) {
  83                 amd_nb_smu_index_read(pdev, PCI_DEVFN(0, 0),
  84                                       F15H_M60H_REPORTED_TEMP_CTRL_OFFSET,
  85                                       &regval);
  86         } else {
  87                 pci_read_config_dword(pdev, REG_REPORTED_TEMPERATURE, &regval);
  88         }
  89         return sprintf(buf, "%u\n", (regval >> 21) * 125);
  90 }
  91
  92 static ssize_t show_temp_max(struct device *dev,
  93                              struct device_attribute *attr, char *buf)
  94 {
  95         return sprintf(buf, "%d\n", 70 * 1000);
  96 }
  97
  98 static ssize_t show_temp_crit(struct device *dev,
  99                               struct device_attribute *devattr, char *buf)
 100 {
 101         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 102         int show_hyst = attr->index;
 103         u32 regval;
 104         int value;
 105
 106         pci_read_config_dword(to_pci_dev(dev),
 107                               REG_HARDWARE_THERMAL_CONTROL, &regval);
 108         value = ((regval >> 16) & 0x7f) * 500 + 52000;
 109         if (show_hyst)
 110                 value -= ((regval >> 24) & 0xf) * 500;
 111         return sprintf(buf, "%d\n", value);
 112 }
 113
 114 static ssize_t show_name(struct device *dev,
 115                          struct device_attribute *attr, char *buf)
 116 {
 117         return sprintf(buf, "k10temp\n");
 118 }
 119
 120 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
 121 static DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max, NULL);
 122 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0);
 123 static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, show_temp_crit, NULL, 1);
 124 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 125
 126 static bool has_erratum_319(struct pci_dev *pdev)
 127 {
 128         u32 pkg_type, reg_dram_cfg;
 129
 130         if (boot_cpu_data.x86 != 0x10)
 131                 return false;
 132
 133         /*
 134          * Erratum 319: The thermal sensor of Socket F/AM2+ processors
 135          *              may be unreliable.
 136          */
 137         pkg_type = cpuid_ebx(0x80000001) & CPUID_PKGTYPE_MASK;
 138         if (pkg_type == CPUID_PKGTYPE_F)
 139                 return true;
 140         if (pkg_type != CPUID_PKGTYPE_AM2R2_AM3)
 141                 return false;
 142
 143         /* DDR3 memory implies socket AM3, which is good */
 144         pci_bus_read_config_dword(pdev->bus,
 145                                   PCI_DEVFN(PCI_SLOT(pdev->devfn), 2),
 146                                   REG_DCT0_CONFIG_HIGH, &reg_dram_cfg);
 147         if (reg_dram_cfg & DDR3_MODE)
 148                 return false;
 149
 150         /*
 151          * Unfortunately it is possible to run a socket AM3 CPU with DDR2
 152          * memory. We blacklist all the cores which do exist in socket AM2+
 153          * format. It still isn't perfect, as RB-C2 cores exist in both AM2+
 154          * and AM3 formats, but that's the best we can do.
 155          */
 156         return boot_cpu_data.x86_model < 4 ||
 157                (boot_cpu_data.x86_model == 4 && boot_cpu_data.x86_mask <= 2);
 158 }
 159
 160 static int k10temp_probe(struct pci_dev *pdev,
 161                                    const struct pci_device_id *id)
 162 {
 163         struct device *hwmon_dev;
 164         u32 reg_caps, reg_htc;
 165         int unreliable = has_erratum_319(pdev);
 166         int err;
 167
 168         if (unreliable && !force) {
 169                 dev_err(&pdev->dev,
 170                         "unreliable CPU thermal sensor; monitoring disabled\n");
 171                 err = -ENODEV;
 172                 goto exit;
 173         }
 174
 175         err = device_create_file(&pdev->dev, &dev_attr_temp1_input);
 176         if (err)
 177                 goto exit;
 178         err = device_create_file(&pdev->dev, &dev_attr_temp1_max);
 179         if (err)
 180                 goto exit_remove;
 181
 182         pci_read_config_dword(pdev, REG_NORTHBRIDGE_CAPABILITIES, &reg_caps);
 183         pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, &reg_htc);
 184         if ((reg_caps & NB_CAP_HTC) && (reg_htc & HTC_ENABLE)) {
 185                 err = device_create_file(&pdev->dev,
 186                                 &sensor_dev_attr_temp1_crit.dev_attr);
 187                 if (err)
 188                         goto exit_remove;
 189                 err = device_create_file(&pdev->dev,
 190                                 &sensor_dev_attr_temp1_crit_hyst.dev_attr);
 191                 if (err)
 192                         goto exit_remove;
 193         }
 194
 195         err = device_create_file(&pdev->dev, &dev_attr_name);
 196         if (err)
 197                 goto exit_remove;
 198
 199         hwmon_dev = hwmon_device_register(&pdev->dev);
 200         if (IS_ERR(hwmon_dev)) {
 201                 err = PTR_ERR(hwmon_dev);
 202                 goto exit_remove;
 203         }
 204         pci_set_drvdata(pdev, hwmon_dev);
 205
 206         if (unreliable && force)
 207                 dev_warn(&pdev->dev,
 208                          "unreliable CPU thermal sensor; check erratum 319\n");
 209         return 0;
 210
 211 exit_remove:
 212         device_remove_file(&pdev->dev, &dev_attr_name);
 213         device_remove_file(&pdev->dev, &dev_attr_temp1_input);
 214         device_remove_file(&pdev->dev, &dev_attr_temp1_max);
 215         device_remove_file(&pdev->dev,
 216                            &sensor_dev_attr_temp1_crit.dev_attr);
 217         device_remove_file(&pdev->dev,
 218                            &sensor_dev_attr_temp1_crit_hyst.dev_attr);
 219 exit:
 220         return err;
 221 }
 222
 223 static void k10temp_remove(struct pci_dev *pdev)
 224 {
 225         hwmon_device_unregister(pci_get_drvdata(pdev));
 226         device_remove_file(&pdev->dev, &dev_attr_name);
 227         device_remove_file(&pdev->dev, &dev_attr_temp1_input);
 228         device_remove_file(&pdev->dev, &dev_attr_temp1_max);
 229         device_remove_file(&pdev->dev,
 230                            &sensor_dev_attr_temp1_crit.dev_attr);
 231         device_remove_file(&pdev->dev,
 232                            &sensor_dev_attr_temp1_crit_hyst.dev_attr);
 233 }
 234
 235 static const struct pci_device_id k10temp_id_table[] = {
 236         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
 237         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_11H_NB_MISC) },
 238         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CNB17H_F3) },
 239         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) },
 240         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M10H_F3) },
 241         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F3) },
 242         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M60H_NB_F3) },
 243         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_NB_F3) },
 244         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F3) },
 245         {}
 246 };
 247 MODULE_DEVICE_TABLE(pci, k10temp_id_table);
 248
 249 static struct pci_driver k10temp_driver = {
 250         .name = "k10temp",
 251         .id_table = k10temp_id_table,
 252         .probe = k10temp_probe,
 253         .remove = k10temp_remove,
 254 };
 255
 256 module_pci_driver(k10temp_driver);