hwmon: New driver for AMD Family 10h/11h CPUs (3c57e89b) · Commits · 戴 / test

Documentation/hwmon/k10temp

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		Kernel driver k10temp
		=====================

		Supported chips:
		* AMD Family 10h processors:
		Socket F: Quad-Core/Six-Core/Embedded Opteron
		Socket AM2+: Opteron, Phenom (II) X3/X4
		Socket AM3: Quad-Core Opteron, Athlon/Phenom II X2/X3/X4, Sempron II
		Socket S1G3: Athlon II, Sempron, Turion II
		* AMD Family 11h processors:
		Socket S1G2: Athlon (X2), Sempron (X2), Turion X2 (Ultra)

		Prefix: 'k10temp'
		Addresses scanned: PCI space
		Datasheets:
		BIOS and Kernel Developer's Guide (BKDG) For AMD Family 10h Processors:
		http://support.amd.com/us/Processor_TechDocs/31116.pdf
		BIOS and Kernel Developer's Guide (BKDG) for AMD Family 11h Processors:
		http://support.amd.com/us/Processor_TechDocs/41256.pdf
		Revision Guide for AMD Family 10h Processors:
		http://support.amd.com/us/Processor_TechDocs/41322.pdf
		Revision Guide for AMD Family 11h Processors:
		http://support.amd.com/us/Processor_TechDocs/41788.pdf
		AMD Family 11h Processor Power and Thermal Data Sheet for Notebooks:
		http://support.amd.com/us/Processor_TechDocs/43373.pdf
		AMD Family 10h Server and Workstation Processor Power and Thermal Data Sheet:
		http://support.amd.com/us/Processor_TechDocs/43374.pdf
		AMD Family 10h Desktop Processor Power and Thermal Data Sheet:
		http://support.amd.com/us/Processor_TechDocs/43375.pdf

		Author: Clemens Ladisch <clemens@ladisch.de>

		Description
		-----------

		This driver permits reading of the internal temperature sensor of AMD
		Family 10h and 11h processors.

		All these processors have a sensor, but on older revisions of Family 10h
		processors, the sensor may return inconsistent values (erratum 319). The
		driver will refuse to load on these revisions unless you specify the
		"force=1" module parameter.

		There is one temperature measurement value, available as temp1_input in
		sysfs. It is measured in degrees Celsius with a resolution of 1/8th degree.
		Please note that it is defined as a relative value; to quote the AMD manual:

		Tctl is the processor temperature control value, used by the platform to
		control cooling systems. Tctl is a non-physical temperature on an
		arbitrary scale measured in degrees. It does _not_ represent an actual
		physical temperature like die or case temperature. Instead, it specifies
		the processor temperature relative to the point at which the system must
		supply the maximum cooling for the processor's specified maximum case
		temperature and maximum thermal power dissipation.

		The maximum value for Tctl is available in the file temp1_max.

		If the BIOS has enabled hardware temperature control, the threshold at
		which the processor will throttle itself to avoid damage is available in
		temp1_crit and temp1_crit_hyst.

drivers/hwmon/Kconfig

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		@@ -228,6 +228,18 @@ config SENSORS_K8TEMP
		This driver can also be built as a module. If so, the module
		will be called k8temp.

		config SENSORS_K10TEMP
		tristate "AMD Phenom/Sempron/Turion/Opteron temperature sensor"
		depends on X86 && PCI
		help
		If you say yes here you get support for the temperature
		sensor(s) inside your CPU. Supported are later revisions of
		the AMD Family 10h and all revisions of the AMD Family 11h
		microarchitectures.

		This driver can also be built as a module. If so, the module
		will be called k10temp.

		config SENSORS_AMS
		tristate "Apple Motion Sensor driver"
		depends on PPC_PMAC && !PPC64 && INPUT && ((ADB_PMU && I2C = y) \|\| (ADB_PMU && !I2C) \|\| I2C) && EXPERIMENTAL

drivers/hwmon/Makefile

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		@@ -53,6 +53,7 @@ obj-$(CONFIG_SENSORS_IBMAEM) += ibmaem.o
		obj-$(CONFIG_SENSORS_IBMPEX) += ibmpex.o
		obj-$(CONFIG_SENSORS_IT87) += it87.o
		obj-$(CONFIG_SENSORS_K8TEMP) += k8temp.o
		obj-$(CONFIG_SENSORS_K10TEMP) += k10temp.o
		obj-$(CONFIG_SENSORS_LIS3LV02D) += lis3lv02d.o hp_accel.o
		obj-$(CONFIG_SENSORS_LIS3_SPI) += lis3lv02d.o lis3lv02d_spi.o
		obj-$(CONFIG_SENSORS_LM63) += lm63.o

drivers/hwmon/k10temp.c

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		/*
		* k10temp.c - AMD Family 10h/11h processor hardware monitoring
		*
		* Copyright (c) 2009 Clemens Ladisch <clemens@ladisch.de>
		*
		*
		* This driver is free software; you can redistribute it and/or
		* modify it under the terms of the GNU General Public License; either
		* version 2 of the License, or (at your option) any later version.
		*
		* This driver is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
		* See the GNU General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this driver; if not, see <http://www.gnu.org/licenses/>.
		*/

		#include <linux/err.h>
		#include <linux/hwmon.h>
		#include <linux/hwmon-sysfs.h>
		#include <linux/init.h>
		#include <linux/module.h>
		#include <linux/pci.h>
		#include <asm/processor.h>

		MODULE_DESCRIPTION("AMD Family 10h/11h CPU core temperature monitor");
		MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
		MODULE_LICENSE("GPL");

		static bool force;
		module_param(force, bool, 0444);
		MODULE_PARM_DESC(force, "force loading on processors with erratum 319");

		#define REG_HARDWARE_THERMAL_CONTROL 0x64
		#define HTC_ENABLE 0x00000001

		#define REG_REPORTED_TEMPERATURE 0xa4

		#define REG_NORTHBRIDGE_CAPABILITIES 0xe8
		#define NB_CAP_HTC 0x00000400

		static ssize_t show_temp(struct device *dev,
		struct device_attribute attr, char buf)
		{
		u32 regval;

		pci_read_config_dword(to_pci_dev(dev),
		REG_REPORTED_TEMPERATURE, &regval);
		return sprintf(buf, "%u\n", (regval >> 21) * 125);
		}

		static ssize_t show_temp_max(struct device *dev,
		struct device_attribute attr, char buf)
		{
		return sprintf(buf, "%d\n", 70 * 1000);
		}

		static ssize_t show_temp_crit(struct device *dev,
		struct device_attribute devattr, char buf)
		{
		struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
		int show_hyst = attr->index;
		u32 regval;
		int value;

		pci_read_config_dword(to_pci_dev(dev),
		REG_HARDWARE_THERMAL_CONTROL, &regval);
		value = ((regval >> 16) & 0x7f) * 500 + 52000;
		if (show_hyst)
		value -= ((regval >> 24) & 0xf) * 500;
		return sprintf(buf, "%d\n", value);
		}

		static ssize_t show_name(struct device *dev,
		struct device_attribute attr, char buf)
		{
		return sprintf(buf, "k10temp\n");
		}

		static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
		static DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max, NULL);
		static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0);
		static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, show_temp_crit, NULL, 1);
		static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);

		static bool __devinit has_erratum_319(void)
		{
		/*
		* Erratum 319: The thermal sensor of older Family 10h processors
		* (B steppings) may be unreliable.
		*/
		return boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model <= 2;
		}

		static int __devinit k10temp_probe(struct pci_dev *pdev,
		const struct pci_device_id *id)
		{
		struct device *hwmon_dev;
		u32 reg_caps, reg_htc;
		int err;

		if (has_erratum_319() && !force) {
		dev_err(&pdev->dev,
		"unreliable CPU thermal sensor; monitoring disabled\n");
		err = -ENODEV;
		goto exit;
		}

		err = device_create_file(&pdev->dev, &dev_attr_temp1_input);
		if (err)
		goto exit;
		err = device_create_file(&pdev->dev, &dev_attr_temp1_max);
		if (err)
		goto exit_remove;

		pci_read_config_dword(pdev, REG_NORTHBRIDGE_CAPABILITIES, &reg_caps);
		pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, &reg_htc);
		if ((reg_caps & NB_CAP_HTC) && (reg_htc & HTC_ENABLE)) {
		err = device_create_file(&pdev->dev,
		&sensor_dev_attr_temp1_crit.dev_attr);
		if (err)
		goto exit_remove;
		err = device_create_file(&pdev->dev,
		&sensor_dev_attr_temp1_crit_hyst.dev_attr);
		if (err)
		goto exit_remove;
		}

		err = device_create_file(&pdev->dev, &dev_attr_name);
		if (err)
		goto exit_remove;

		hwmon_dev = hwmon_device_register(&pdev->dev);
		if (IS_ERR(hwmon_dev)) {
		err = PTR_ERR(hwmon_dev);
		goto exit_remove;
		}
		dev_set_drvdata(&pdev->dev, hwmon_dev);

		if (has_erratum_319() && force)
		dev_warn(&pdev->dev,
		"unreliable CPU thermal sensor; check erratum 319\n");
		return 0;

		exit_remove:
		device_remove_file(&pdev->dev, &dev_attr_name);
		device_remove_file(&pdev->dev, &dev_attr_temp1_input);
		device_remove_file(&pdev->dev, &dev_attr_temp1_max);
		device_remove_file(&pdev->dev,
		&sensor_dev_attr_temp1_crit.dev_attr);
		device_remove_file(&pdev->dev,
		&sensor_dev_attr_temp1_crit_hyst.dev_attr);
		exit:
		return err;
		}

		static void __devexit k10temp_remove(struct pci_dev *pdev)
		{
		hwmon_device_unregister(dev_get_drvdata(&pdev->dev));
		device_remove_file(&pdev->dev, &dev_attr_name);
		device_remove_file(&pdev->dev, &dev_attr_temp1_input);
		device_remove_file(&pdev->dev, &dev_attr_temp1_max);
		device_remove_file(&pdev->dev,
		&sensor_dev_attr_temp1_crit.dev_attr);
		device_remove_file(&pdev->dev,
		&sensor_dev_attr_temp1_crit_hyst.dev_attr);
		dev_set_drvdata(&pdev->dev, NULL);
		}

		static struct pci_device_id k10temp_id_table[] = {
		{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
		{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_11H_NB_MISC) },
		{}
		};
		MODULE_DEVICE_TABLE(pci, k10temp_id_table);

		static struct pci_driver k10temp_driver = {
		.name = "k10temp",
		.id_table = k10temp_id_table,
		.probe = k10temp_probe,
		.remove = __devexit_p(k10temp_remove),
		};

		static int __init k10temp_init(void)
		{
		return pci_register_driver(&k10temp_driver);
		}

		static void __exit k10temp_exit(void)
		{
		pci_unregister_driver(&k10temp_driver);
		}

		module_init(k10temp_init)
		module_exit(k10temp_exit)

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