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- // 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");
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