// SPDX-License-Identifier: GPL-2.0-or-later
/*
* k8temp.c - Linux kernel module for hardware monitoring
*
* Copyright (C) 2006 Rudolf Marek <r.marek@assembler.cz>
*
* Inspired from the w83785 and amd756 drivers.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/pci.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <asm/processor.h>
#define TEMP_FROM_REG(val) (((((val) >> 16) & 0xff) - 49) * 1000)
#define REG_TEMP 0xe4
#define SEL_PLACE 0x40
#define SEL_CORE 0x04
struct k8temp_data {
struct device *hwmon_dev;
struct mutex update_lock;
const char *name;
char valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
/* registers values */
u8 sensorsp; /* sensor presence bits - SEL_CORE, SEL_PLACE */
u32 temp[2][2]; /* core, place */
u8 swap_core_select; /* meaning of SEL_CORE is inverted */
u32 temp_offset;
};
static struct k8temp_data *k8temp_update_device(struct device *dev)
{
struct k8temp_data *data = dev_get_drvdata(dev);
struct pci_dev *pdev = to_pci_dev(dev);
u8 tmp;
mutex_lock(&data->update_lock);
if (!data->valid
|| time_after(jiffies, data->last_updated + HZ)) {
pci_read_config_byte(pdev, REG_TEMP, &tmp);
tmp &= ~(SEL_PLACE | SEL_CORE); /* Select sensor 0, core0 */
pci_write_config_byte(pdev, REG_TEMP, tmp);
pci_read_config_dword(pdev, REG_TEMP, &data->temp[0][0]);
if (data->sensorsp & SEL_PLACE) {
tmp |= SEL_PLACE; /* Select sensor 1, core0 */
pci_write_config_byte(pdev, REG_TEMP, tmp);
pci_read_config_dword(pdev, REG_TEMP,
&data->temp[0][1]);
}
if (data->sensorsp & SEL_CORE) {
tmp &= ~SEL_PLACE; /* Select sensor 0, core1 */
tmp |= SEL_CORE;
pci_write_config_byte(pdev, REG_TEMP, tmp);
pci_read_config_dword(pdev, REG_TEMP,
&data->temp[1][0]);
if (data->sensorsp & SEL_PLACE) {
tmp |= SEL_PLACE; /* Select sensor 1, core1 */
pci_write_config_byte(pdev, REG_TEMP, tmp);
pci_read_config_dword(pdev, REG_TEMP,
&data->temp[1][1]);
}
}
data->last_updated = jiffies;
data->valid = 1;
}
mutex_unlock(&data->update_lock);
return data;
}
/*
* Sysfs stuff
*/
static ssize_t name_show(struct device *dev, struct device_attribute
*devattr, char *buf)
{
struct k8temp_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%s\n", data->name);
}
static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute_2 *attr =
to_sensor_dev_attr_2(devattr);
int core = attr->nr;
int place = attr->index;
int temp;
struct k8temp_data *data = k8temp_update_device(dev);
if (data->swap_core_select && (data->sensorsp & SEL_CORE))
core = core ? 0 : 1;
temp = TEMP_FROM_REG(data->temp[core][place]) + data->temp_offset;
return sprintf(buf, "%d\n", temp);
}
/* core, place */
static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0, 0);
static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 0, 1);
static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 1, 0);
static SENSOR_DEVICE_ATTR_2_RO(temp4_input, temp, 1, 1);
static DEVICE_ATTR_RO(name);
static const struct pci_device_id k8temp_ids[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
{ 0 },
};
MODULE_DEVICE_TABLE(pci, k8temp_ids);
static int is_rev_g_desktop(u8 model)
{
u32 brandidx;
if (model < 0x69)
return 0;
if (model == 0xc1 || model == 0x6c || model == 0x7c)
return 0;
/*
* Differentiate between AM2 and ASB1.
* See "Constructing the processor Name String" in "Revision
* Guide for AMD NPT Family 0Fh Processors" (33610).
*/
brandidx = cpuid_ebx(0x80000001);
brandidx = (brandidx >> 9) & 0x1f;
/* Single core */
if ((model == 0x6f || model == 0x7f) &&
(brandidx == 0x7 || brandidx == 0x9 || brandidx == 0xc))
return 0;
/* Dual core */
if (model == 0x6b &&
(brandidx == 0xb || brandidx == 0xc))
return 0;
return 1;
}
static int k8temp_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
int err;
u8 scfg;
u32 temp;
u8 model, stepping;
struct k8temp_data *data;
data = devm_kzalloc(&pdev->dev, sizeof(struct k8temp_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
model = boot_cpu_data.x86_model;
stepping = boot_cpu_data.x86_stepping;
/* feature available since SH-C0, exclude older revisions */
if ((model == 4 && stepping == 0) ||
(model == 5 && stepping <= 1))
return -ENODEV;
/*
* AMD NPT family 0fh, i.e. RevF and RevG:
* meaning of SEL_CORE bit is inverted
*/
if (model >= 0x40) {
data->swap_core_select = 1;
dev_warn(&pdev->dev,
"Temperature readouts might be wrong - check erratum #141\n");
}
/*
* RevG desktop CPUs (i.e. no socket S1G1 or ASB1 parts) need
* additional offset, otherwise reported temperature is below
* ambient temperature
*/
if (is_rev_g_desktop(model))
data->temp_offset = 21000;
pci_read_config_byte(pdev, REG_TEMP, &scfg);
scfg &= ~(SEL_PLACE | SEL_CORE); /* Select sensor 0, core0 */
pci_write_config_byte(pdev, REG_TEMP, scfg);
pci_read_config_byte(pdev, REG_TEMP, &scfg);
if (scfg & (SEL_PLACE | SEL_CORE)) {
dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n");
return -ENODEV;
}
scfg |= (SEL_PLACE | SEL_CORE);
pci_write_config_byte(pdev, REG_TEMP, scfg);
/* now we know if we can change core and/or sensor */
pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp);
if (data->sensorsp & SEL_PLACE) {
scfg &= ~SEL_CORE; /* Select sensor 1, core0 */
pci_write_config_byte(pdev, REG_TEMP, scfg);
pci_read_config_dword(pdev, REG_TEMP, &temp);
scfg |= SEL_CORE; /* prepare for next selection */
if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is unlikely */
data->sensorsp &= ~SEL_PLACE;
}
if (data->sensorsp & SEL_CORE) {
scfg &= ~SEL_PLACE; /* Select sensor 0, core1 */
pci_write_config_byte(pdev, REG_TEMP, scfg);
pci_read_config_dword(pdev, REG_TEMP, &temp);
if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is unlikely */
data->sensorsp &= ~SEL_CORE;
}
data->name = "k8temp";
mutex_init(&data->update_lock);
pci_set_drvdata(pdev, data);
/* Register sysfs hooks */
err = device_create_file(&pdev->dev,
&sensor_dev_attr_temp1_input.dev_attr);
if (err)
goto exit_remove;
/* sensor can be changed and reports something */
if (data->sensorsp & SEL_PLACE) {
err = device_create_file(&pdev->dev,
&sensor_dev_attr_temp2_input.dev_attr);
if (err)
goto exit_remove;
}
/* core can be changed and reports something */
if (data->sensorsp & SEL_CORE) {
err = device_create_file(&pdev->dev,
&sensor_dev_attr_temp3_input.dev_attr);
if (err)
goto exit_remove;
if (data->sensorsp & SEL_PLACE) {
err = device_create_file(&pdev->dev,
&sensor_dev_attr_temp4_input.
dev_attr);
if (err)
goto exit_remove;
}
}
err = device_create_file(&pdev->dev, &dev_attr_name);
if (err)
goto exit_remove;
data->hwmon_dev = hwmon_device_register(&pdev->dev);
if (IS_ERR(data->hwmon_dev)) {
err = PTR_ERR(data->hwmon_dev);
goto exit_remove;
}
return 0;
exit_remove:
device_remove_file(&pdev->dev,
&sensor_dev_attr_temp1_input.dev_attr);
device_remove_file(&pdev->dev,
&sensor_dev_attr_temp2_input.dev_attr);
device_remove_file(&pdev->dev,
&sensor_dev_attr_temp3_input.dev_attr);
device_remove_file(&pdev->dev,
&sensor_dev_attr_temp4_input.dev_attr);
device_remove_file(&pdev->dev, &dev_attr_name);
return err;
}
static void k8temp_remove(struct pci_dev *pdev)
{
struct k8temp_data *data = pci_get_drvdata(pdev);
hwmon_device_unregister(data->hwmon_dev);
device_remove_file(&pdev->dev,
&sensor_dev_attr_temp1_input.dev_attr);
device_remove_file(&pdev->dev,
&sensor_dev_attr_temp2_input.dev_attr);
device_remove_file(&pdev->dev,
&sensor_dev_attr_temp3_input.dev_attr);
device_remove_file(&pdev->dev,
&sensor_dev_attr_temp4_input.dev_attr);
device_remove_file(&pdev->dev, &dev_attr_name);
}
static struct pci_driver k8temp_driver = {
.name = "k8temp",
.id_table = k8temp_ids,
.probe = k8temp_probe,
.remove = k8temp_remove,
};
module_pci_driver(k8temp_driver);
MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
MODULE_DESCRIPTION("AMD K8 core temperature monitor");
MODULE_LICENSE("GPL");
