forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
225 lines
5.4 KiB
225 lines
5.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* k8temp.c - Linux kernel module for hardware monitoring |
|
* |
|
* Copyright (C) 2006 Rudolf Marek <[email protected]> |
|
* |
|
* 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 <[email protected]>"); |
|
MODULE_DESCRIPTION("AMD K8 core temperature monitor"); |
|
MODULE_LICENSE("GPL");
|
|
|