linux/drivers/hwmon/k8temp.c

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 1 Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program 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 program if not write to the free software foundation inc 51 franklin street fifth floor boston ma 02110 1301 usa this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option [no]_[pad]_[ctrl] any later version this program 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 program if not write to the free software foundation inc 51 franklin street fifth floor boston ma 02110 1301 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 176 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Jilayne Lovejoy <opensource@jilayne.com> Reviewed-by: Steve Winslow <swinslow@gmail.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190519154040.652910950@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-19 21:51:31 +08:00
// 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/pci.h>
#include <linux/hwmon.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 mutex update_lock;
/* registers values */
u8 sensorsp; /* sensor presence bits - SEL_CORE, SEL_PLACE */
u8 swap_core_select; /* meaning of SEL_CORE is inverted */
u32 temp_offset;
};
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 umode_t
k8temp_is_visible(const void *drvdata, enum hwmon_sensor_types type,
u32 attr, int channel)
{
const struct k8temp_data *data = drvdata;
if ((channel & 1) && !(data->sensorsp & SEL_PLACE))
return 0;
if ((channel & 2) && !(data->sensorsp & SEL_CORE))
return 0;
return 0444;
}
static int
k8temp_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
struct k8temp_data *data = dev_get_drvdata(dev);
struct pci_dev *pdev = to_pci_dev(dev->parent);
int core, place;
u32 temp;
u8 tmp;
core = (channel >> 1) & 1;
place = channel & 1;
core ^= data->swap_core_select;
mutex_lock(&data->update_lock);
pci_read_config_byte(pdev, REG_TEMP, &tmp);
tmp &= ~(SEL_PLACE | SEL_CORE);
if (core)
tmp |= SEL_CORE;
if (place)
tmp |= SEL_PLACE;
pci_write_config_byte(pdev, REG_TEMP, tmp);
pci_read_config_dword(pdev, REG_TEMP, &temp);
mutex_unlock(&data->update_lock);
*val = TEMP_FROM_REG(temp) + data->temp_offset;
return 0;
}
static const struct hwmon_ops k8temp_ops = {
.is_visible = k8temp_is_visible,
.read = k8temp_read,
};
static const struct hwmon_channel_info *k8temp_info[] = {
HWMON_CHANNEL_INFO(temp,
HWMON_T_INPUT, HWMON_T_INPUT, HWMON_T_INPUT, HWMON_T_INPUT),
NULL
};
static const struct hwmon_chip_info k8temp_chip_info = {
.ops = &k8temp_ops,
.info = k8temp_info,
};
static int k8temp_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
u8 scfg;
u32 temp;
u8 model, stepping;
struct k8temp_data *data;
struct device *hwmon_dev;
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;
}
mutex_init(&data->update_lock);
hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev,
"k8temp",
data,
&k8temp_chip_info,
NULL);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static struct pci_driver k8temp_driver = {
.name = "k8temp",
.id_table = k8temp_ids,
.probe = k8temp_probe,
};
module_pci_driver(k8temp_driver);
MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
MODULE_DESCRIPTION("AMD K8 core temperature monitor");
MODULE_LICENSE("GPL");