332 lines
8.8 KiB
C
332 lines
8.8 KiB
C
/*
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* k8temp.c - Linux kernel module for hardware monitoring
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*
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* Copyright (C) 2006 Rudolf Marek <r.marek@assembler.cz>
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*
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* Inspired from the w83785 and amd756 drivers.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301 USA.
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*/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/jiffies.h>
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#include <linux/pci.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <asm/processor.h>
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#define TEMP_FROM_REG(val) (((((val) >> 16) & 0xff) - 49) * 1000)
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#define REG_TEMP 0xe4
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#define SEL_PLACE 0x40
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#define SEL_CORE 0x04
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struct k8temp_data {
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struct device *hwmon_dev;
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struct mutex update_lock;
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const char *name;
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char valid; /* zero until following fields are valid */
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unsigned long last_updated; /* in jiffies */
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/* registers values */
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u8 sensorsp; /* sensor presence bits - SEL_CORE & SEL_PLACE */
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u32 temp[2][2]; /* core, place */
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u8 swap_core_select; /* meaning of SEL_CORE is inverted */
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u32 temp_offset;
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};
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static struct k8temp_data *k8temp_update_device(struct device *dev)
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{
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struct k8temp_data *data = dev_get_drvdata(dev);
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struct pci_dev *pdev = to_pci_dev(dev);
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u8 tmp;
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mutex_lock(&data->update_lock);
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if (!data->valid
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|| time_after(jiffies, data->last_updated + HZ)) {
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pci_read_config_byte(pdev, REG_TEMP, &tmp);
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tmp &= ~(SEL_PLACE | SEL_CORE); /* Select sensor 0, core0 */
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pci_write_config_byte(pdev, REG_TEMP, tmp);
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pci_read_config_dword(pdev, REG_TEMP, &data->temp[0][0]);
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if (data->sensorsp & SEL_PLACE) {
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tmp |= SEL_PLACE; /* Select sensor 1, core0 */
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pci_write_config_byte(pdev, REG_TEMP, tmp);
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pci_read_config_dword(pdev, REG_TEMP,
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&data->temp[0][1]);
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}
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if (data->sensorsp & SEL_CORE) {
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tmp &= ~SEL_PLACE; /* Select sensor 0, core1 */
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tmp |= SEL_CORE;
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pci_write_config_byte(pdev, REG_TEMP, tmp);
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pci_read_config_dword(pdev, REG_TEMP,
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&data->temp[1][0]);
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if (data->sensorsp & SEL_PLACE) {
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tmp |= SEL_PLACE; /* Select sensor 1, core1 */
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pci_write_config_byte(pdev, REG_TEMP, tmp);
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pci_read_config_dword(pdev, REG_TEMP,
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&data->temp[1][1]);
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}
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}
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data->last_updated = jiffies;
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data->valid = 1;
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}
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mutex_unlock(&data->update_lock);
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return data;
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}
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/*
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* Sysfs stuff
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*/
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static ssize_t show_name(struct device *dev, struct device_attribute
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*devattr, char *buf)
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{
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struct k8temp_data *data = dev_get_drvdata(dev);
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return sprintf(buf, "%s\n", data->name);
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}
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static ssize_t show_temp(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct sensor_device_attribute_2 *attr =
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to_sensor_dev_attr_2(devattr);
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int core = attr->nr;
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int place = attr->index;
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int temp;
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struct k8temp_data *data = k8temp_update_device(dev);
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if (data->swap_core_select)
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core = core ? 0 : 1;
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temp = TEMP_FROM_REG(data->temp[core][place]) + data->temp_offset;
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return sprintf(buf, "%d\n", temp);
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}
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/* core, place */
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static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
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static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
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static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 1, 0);
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static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 1, 1);
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static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
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static struct pci_device_id k8temp_ids[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
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{ 0 },
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};
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MODULE_DEVICE_TABLE(pci, k8temp_ids);
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static int __devinit k8temp_probe(struct pci_dev *pdev,
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const struct pci_device_id *id)
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{
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int err;
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u8 scfg;
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u32 temp;
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u8 model, stepping;
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struct k8temp_data *data;
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if (!(data = kzalloc(sizeof(struct k8temp_data), GFP_KERNEL))) {
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err = -ENOMEM;
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goto exit;
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}
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model = boot_cpu_data.x86_model;
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stepping = boot_cpu_data.x86_mask;
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switch (boot_cpu_data.x86) {
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case 0xf:
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/* feature available since SH-C0, exclude older revisions */
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if (((model == 4) && (stepping == 0)) ||
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((model == 5) && (stepping <= 1))) {
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err = -ENODEV;
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goto exit_free;
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}
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/*
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* AMD NPT family 0fh, i.e. RevF and RevG:
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* meaning of SEL_CORE bit is inverted
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*/
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if (model >= 0x40) {
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data->swap_core_select = 1;
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dev_warn(&pdev->dev, "Temperature readouts might be "
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"wrong - check erratum #141\n");
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}
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if ((model >= 0x69) &&
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!(model == 0xc1 || model == 0x6c || model == 0x7c)) {
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/*
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* RevG desktop CPUs (i.e. no socket S1G1 parts)
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* need additional offset, otherwise reported
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* temperature is below ambient temperature
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*/
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data->temp_offset = 21000;
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}
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break;
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}
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pci_read_config_byte(pdev, REG_TEMP, &scfg);
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scfg &= ~(SEL_PLACE | SEL_CORE); /* Select sensor 0, core0 */
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pci_write_config_byte(pdev, REG_TEMP, scfg);
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pci_read_config_byte(pdev, REG_TEMP, &scfg);
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if (scfg & (SEL_PLACE | SEL_CORE)) {
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dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n");
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err = -ENODEV;
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goto exit_free;
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}
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scfg |= (SEL_PLACE | SEL_CORE);
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pci_write_config_byte(pdev, REG_TEMP, scfg);
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/* now we know if we can change core and/or sensor */
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pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp);
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if (data->sensorsp & SEL_PLACE) {
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scfg &= ~SEL_CORE; /* Select sensor 1, core0 */
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pci_write_config_byte(pdev, REG_TEMP, scfg);
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pci_read_config_dword(pdev, REG_TEMP, &temp);
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scfg |= SEL_CORE; /* prepare for next selection */
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if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is not likely */
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data->sensorsp &= ~SEL_PLACE;
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}
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if (data->sensorsp & SEL_CORE) {
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scfg &= ~SEL_PLACE; /* Select sensor 0, core1 */
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pci_write_config_byte(pdev, REG_TEMP, scfg);
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pci_read_config_dword(pdev, REG_TEMP, &temp);
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if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is not likely */
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data->sensorsp &= ~SEL_CORE;
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}
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data->name = "k8temp";
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mutex_init(&data->update_lock);
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dev_set_drvdata(&pdev->dev, data);
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/* Register sysfs hooks */
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err = device_create_file(&pdev->dev,
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&sensor_dev_attr_temp1_input.dev_attr);
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if (err)
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goto exit_remove;
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/* sensor can be changed and reports something */
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if (data->sensorsp & SEL_PLACE) {
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err = device_create_file(&pdev->dev,
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&sensor_dev_attr_temp2_input.dev_attr);
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if (err)
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goto exit_remove;
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}
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/* core can be changed and reports something */
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if (data->sensorsp & SEL_CORE) {
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err = device_create_file(&pdev->dev,
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&sensor_dev_attr_temp3_input.dev_attr);
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if (err)
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goto exit_remove;
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if (data->sensorsp & SEL_PLACE)
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err = device_create_file(&pdev->dev,
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&sensor_dev_attr_temp4_input.
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dev_attr);
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if (err)
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goto exit_remove;
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}
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err = device_create_file(&pdev->dev, &dev_attr_name);
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if (err)
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goto exit_remove;
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data->hwmon_dev = hwmon_device_register(&pdev->dev);
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if (IS_ERR(data->hwmon_dev)) {
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err = PTR_ERR(data->hwmon_dev);
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goto exit_remove;
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}
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return 0;
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exit_remove:
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device_remove_file(&pdev->dev,
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&sensor_dev_attr_temp1_input.dev_attr);
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device_remove_file(&pdev->dev,
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&sensor_dev_attr_temp2_input.dev_attr);
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device_remove_file(&pdev->dev,
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&sensor_dev_attr_temp3_input.dev_attr);
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device_remove_file(&pdev->dev,
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&sensor_dev_attr_temp4_input.dev_attr);
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device_remove_file(&pdev->dev, &dev_attr_name);
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exit_free:
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dev_set_drvdata(&pdev->dev, NULL);
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kfree(data);
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exit:
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return err;
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}
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static void __devexit k8temp_remove(struct pci_dev *pdev)
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{
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struct k8temp_data *data = dev_get_drvdata(&pdev->dev);
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hwmon_device_unregister(data->hwmon_dev);
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device_remove_file(&pdev->dev,
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&sensor_dev_attr_temp1_input.dev_attr);
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device_remove_file(&pdev->dev,
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&sensor_dev_attr_temp2_input.dev_attr);
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device_remove_file(&pdev->dev,
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&sensor_dev_attr_temp3_input.dev_attr);
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device_remove_file(&pdev->dev,
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&sensor_dev_attr_temp4_input.dev_attr);
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device_remove_file(&pdev->dev, &dev_attr_name);
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dev_set_drvdata(&pdev->dev, NULL);
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kfree(data);
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}
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static struct pci_driver k8temp_driver = {
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.name = "k8temp",
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.id_table = k8temp_ids,
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.probe = k8temp_probe,
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.remove = __devexit_p(k8temp_remove),
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};
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static int __init k8temp_init(void)
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{
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return pci_register_driver(&k8temp_driver);
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}
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static void __exit k8temp_exit(void)
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{
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pci_unregister_driver(&k8temp_driver);
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}
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MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
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MODULE_DESCRIPTION("AMD K8 core temperature monitor");
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MODULE_LICENSE("GPL");
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module_init(k8temp_init)
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module_exit(k8temp_exit)
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