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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, ®val);
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, ®val);
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, ®_caps);
pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, ®_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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