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hwmon: New driver for AMD Family 10h/11h CPUs
This adds a driver for the internal temperature sensor of AMD Family 10h and 11h CPUs. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Clemens Ladisch
Jean Delvare
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8bea8672ed
commit
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4 changed files with 270 additions and 0 deletions
60
Documentation/hwmon/k10temp
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60
Documentation/hwmon/k10temp
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@ -0,0 +1,60 @@
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Kernel driver k10temp
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=====================
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Supported chips:
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* AMD Family 10h processors:
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Socket F: Quad-Core/Six-Core/Embedded Opteron
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Socket AM2+: Opteron, Phenom (II) X3/X4
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Socket AM3: Quad-Core Opteron, Athlon/Phenom II X2/X3/X4, Sempron II
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Socket S1G3: Athlon II, Sempron, Turion II
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* AMD Family 11h processors:
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Socket S1G2: Athlon (X2), Sempron (X2), Turion X2 (Ultra)
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Prefix: 'k10temp'
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Addresses scanned: PCI space
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Datasheets:
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BIOS and Kernel Developer's Guide (BKDG) For AMD Family 10h Processors:
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http://support.amd.com/us/Processor_TechDocs/31116.pdf
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BIOS and Kernel Developer's Guide (BKDG) for AMD Family 11h Processors:
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http://support.amd.com/us/Processor_TechDocs/41256.pdf
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Revision Guide for AMD Family 10h Processors:
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http://support.amd.com/us/Processor_TechDocs/41322.pdf
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Revision Guide for AMD Family 11h Processors:
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http://support.amd.com/us/Processor_TechDocs/41788.pdf
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AMD Family 11h Processor Power and Thermal Data Sheet for Notebooks:
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http://support.amd.com/us/Processor_TechDocs/43373.pdf
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AMD Family 10h Server and Workstation Processor Power and Thermal Data Sheet:
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http://support.amd.com/us/Processor_TechDocs/43374.pdf
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AMD Family 10h Desktop Processor Power and Thermal Data Sheet:
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http://support.amd.com/us/Processor_TechDocs/43375.pdf
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Author: Clemens Ladisch <clemens@ladisch.de>
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Description
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-----------
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This driver permits reading of the internal temperature sensor of AMD
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Family 10h and 11h processors.
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All these processors have a sensor, but on older revisions of Family 10h
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processors, the sensor may return inconsistent values (erratum 319). The
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driver will refuse to load on these revisions unless you specify the
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"force=1" module parameter.
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There is one temperature measurement value, available as temp1_input in
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sysfs. It is measured in degrees Celsius with a resolution of 1/8th degree.
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Please note that it is defined as a relative value; to quote the AMD manual:
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Tctl is the processor temperature control value, used by the platform to
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control cooling systems. Tctl is a non-physical temperature on an
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arbitrary scale measured in degrees. It does _not_ represent an actual
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physical temperature like die or case temperature. Instead, it specifies
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the processor temperature relative to the point at which the system must
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supply the maximum cooling for the processor's specified maximum case
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temperature and maximum thermal power dissipation.
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The maximum value for Tctl is available in the file temp1_max.
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If the BIOS has enabled hardware temperature control, the threshold at
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which the processor will throttle itself to avoid damage is available in
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temp1_crit and temp1_crit_hyst.
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@ -228,6 +228,18 @@ config SENSORS_K8TEMP
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This driver can also be built as a module. If so, the module
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will be called k8temp.
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config SENSORS_K10TEMP
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tristate "AMD Phenom/Sempron/Turion/Opteron temperature sensor"
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depends on X86 && PCI
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help
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If you say yes here you get support for the temperature
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sensor(s) inside your CPU. Supported are later revisions of
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the AMD Family 10h and all revisions of the AMD Family 11h
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microarchitectures.
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This driver can also be built as a module. If so, the module
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will be called k10temp.
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config SENSORS_AMS
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tristate "Apple Motion Sensor driver"
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depends on PPC_PMAC && !PPC64 && INPUT && ((ADB_PMU && I2C = y) || (ADB_PMU && !I2C) || I2C) && EXPERIMENTAL
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@ -53,6 +53,7 @@ obj-$(CONFIG_SENSORS_IBMAEM) += ibmaem.o
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obj-$(CONFIG_SENSORS_IBMPEX) += ibmpex.o
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obj-$(CONFIG_SENSORS_IT87) += it87.o
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obj-$(CONFIG_SENSORS_K8TEMP) += k8temp.o
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obj-$(CONFIG_SENSORS_K10TEMP) += k10temp.o
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obj-$(CONFIG_SENSORS_LIS3LV02D) += lis3lv02d.o hp_accel.o
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obj-$(CONFIG_SENSORS_LIS3_SPI) += lis3lv02d.o lis3lv02d_spi.o
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obj-$(CONFIG_SENSORS_LM63) += lm63.o
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197
drivers/hwmon/k10temp.c
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197
drivers/hwmon/k10temp.c
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/*
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* k10temp.c - AMD Family 10h/11h processor hardware monitoring
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*
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* Copyright (c) 2009 Clemens Ladisch <clemens@ladisch.de>
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*
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*
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* This driver is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This driver is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this driver; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/err.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <asm/processor.h>
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MODULE_DESCRIPTION("AMD Family 10h/11h CPU core temperature monitor");
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MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
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MODULE_LICENSE("GPL");
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static bool force;
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module_param(force, bool, 0444);
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MODULE_PARM_DESC(force, "force loading on processors with erratum 319");
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#define REG_HARDWARE_THERMAL_CONTROL 0x64
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#define HTC_ENABLE 0x00000001
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#define REG_REPORTED_TEMPERATURE 0xa4
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#define REG_NORTHBRIDGE_CAPABILITIES 0xe8
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#define NB_CAP_HTC 0x00000400
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static ssize_t show_temp(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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u32 regval;
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pci_read_config_dword(to_pci_dev(dev),
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REG_REPORTED_TEMPERATURE, ®val);
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return sprintf(buf, "%u\n", (regval >> 21) * 125);
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}
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static ssize_t show_temp_max(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%d\n", 70 * 1000);
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}
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static ssize_t show_temp_crit(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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int show_hyst = attr->index;
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u32 regval;
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int value;
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pci_read_config_dword(to_pci_dev(dev),
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REG_HARDWARE_THERMAL_CONTROL, ®val);
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value = ((regval >> 16) & 0x7f) * 500 + 52000;
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if (show_hyst)
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value -= ((regval >> 24) & 0xf) * 500;
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return sprintf(buf, "%d\n", value);
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}
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static ssize_t show_name(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "k10temp\n");
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}
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static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
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static DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max, NULL);
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static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, show_temp_crit, NULL, 1);
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static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
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static bool __devinit has_erratum_319(void)
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{
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/*
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* Erratum 319: The thermal sensor of older Family 10h processors
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* (B steppings) may be unreliable.
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*/
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return boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model <= 2;
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}
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static int __devinit k10temp_probe(struct pci_dev *pdev,
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const struct pci_device_id *id)
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{
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struct device *hwmon_dev;
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u32 reg_caps, reg_htc;
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int err;
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if (has_erratum_319() && !force) {
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dev_err(&pdev->dev,
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"unreliable CPU thermal sensor; monitoring disabled\n");
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err = -ENODEV;
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goto exit;
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}
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err = device_create_file(&pdev->dev, &dev_attr_temp1_input);
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if (err)
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goto exit;
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err = device_create_file(&pdev->dev, &dev_attr_temp1_max);
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if (err)
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goto exit_remove;
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pci_read_config_dword(pdev, REG_NORTHBRIDGE_CAPABILITIES, ®_caps);
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pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, ®_htc);
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if ((reg_caps & NB_CAP_HTC) && (reg_htc & HTC_ENABLE)) {
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err = device_create_file(&pdev->dev,
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&sensor_dev_attr_temp1_crit.dev_attr);
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if (err)
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goto exit_remove;
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err = device_create_file(&pdev->dev,
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&sensor_dev_attr_temp1_crit_hyst.dev_attr);
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if (err)
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goto exit_remove;
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}
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err = device_create_file(&pdev->dev, &dev_attr_name);
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if (err)
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goto exit_remove;
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hwmon_dev = hwmon_device_register(&pdev->dev);
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if (IS_ERR(hwmon_dev)) {
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err = PTR_ERR(hwmon_dev);
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goto exit_remove;
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}
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dev_set_drvdata(&pdev->dev, hwmon_dev);
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if (has_erratum_319() && force)
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dev_warn(&pdev->dev,
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"unreliable CPU thermal sensor; check erratum 319\n");
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return 0;
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exit_remove:
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device_remove_file(&pdev->dev, &dev_attr_name);
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device_remove_file(&pdev->dev, &dev_attr_temp1_input);
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device_remove_file(&pdev->dev, &dev_attr_temp1_max);
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device_remove_file(&pdev->dev,
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&sensor_dev_attr_temp1_crit.dev_attr);
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device_remove_file(&pdev->dev,
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&sensor_dev_attr_temp1_crit_hyst.dev_attr);
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exit:
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return err;
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}
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static void __devexit k10temp_remove(struct pci_dev *pdev)
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{
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hwmon_device_unregister(dev_get_drvdata(&pdev->dev));
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device_remove_file(&pdev->dev, &dev_attr_name);
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device_remove_file(&pdev->dev, &dev_attr_temp1_input);
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device_remove_file(&pdev->dev, &dev_attr_temp1_max);
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device_remove_file(&pdev->dev,
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&sensor_dev_attr_temp1_crit.dev_attr);
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device_remove_file(&pdev->dev,
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&sensor_dev_attr_temp1_crit_hyst.dev_attr);
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dev_set_drvdata(&pdev->dev, NULL);
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}
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static struct pci_device_id k10temp_id_table[] = {
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{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
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{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_11H_NB_MISC) },
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{}
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};
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MODULE_DEVICE_TABLE(pci, k10temp_id_table);
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static struct pci_driver k10temp_driver = {
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.name = "k10temp",
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.id_table = k10temp_id_table,
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.probe = k10temp_probe,
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.remove = __devexit_p(k10temp_remove),
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};
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static int __init k10temp_init(void)
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{
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return pci_register_driver(&k10temp_driver);
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}
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static void __exit k10temp_exit(void)
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{
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pci_unregister_driver(&k10temp_driver);
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}
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module_init(k10temp_init)
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module_exit(k10temp_exit)
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