171 lines
4.3 KiB
C
171 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/reboot.h>
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#include <linux/jiffies.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <loongson.h>
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#include <boot_param.h>
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#include <loongson_hwmon.h>
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#include <loongson_regs.h>
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static int csr_temp_enable;
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/*
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* Loongson-3 series cpu has two sensors inside,
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* each of them from 0 to 255,
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* if more than 127, that is dangerous.
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* here only provide sensor1 data, because it always hot than sensor0
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*/
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int loongson3_cpu_temp(int cpu)
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{
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u32 reg, prid_rev;
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if (csr_temp_enable) {
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reg = (csr_readl(LOONGSON_CSR_CPUTEMP) & 0xff);
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goto out;
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}
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reg = LOONGSON_CHIPTEMP(cpu);
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prid_rev = read_c0_prid() & PRID_REV_MASK;
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switch (prid_rev) {
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case PRID_REV_LOONGSON3A_R1:
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reg = (reg >> 8) & 0xff;
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break;
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case PRID_REV_LOONGSON3B_R1:
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case PRID_REV_LOONGSON3B_R2:
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case PRID_REV_LOONGSON3A_R2_0:
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case PRID_REV_LOONGSON3A_R2_1:
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reg = ((reg >> 8) & 0xff) - 100;
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break;
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case PRID_REV_LOONGSON3A_R3_0:
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case PRID_REV_LOONGSON3A_R3_1:
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default:
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reg = (reg & 0xffff) * 731 / 0x4000 - 273;
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break;
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}
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out:
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return (int)reg * 1000;
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}
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static int nr_packages;
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static struct device *cpu_hwmon_dev;
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static ssize_t cpu_temp_label(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int id = (to_sensor_dev_attr(attr))->index - 1;
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return sprintf(buf, "CPU %d Temperature\n", id);
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}
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static ssize_t get_cpu_temp(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int id = (to_sensor_dev_attr(attr))->index - 1;
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int value = loongson3_cpu_temp(id);
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return sprintf(buf, "%d\n", value);
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}
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static SENSOR_DEVICE_ATTR(temp1_input, 0444, get_cpu_temp, NULL, 1);
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static SENSOR_DEVICE_ATTR(temp1_label, 0444, cpu_temp_label, NULL, 1);
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static SENSOR_DEVICE_ATTR(temp2_input, 0444, get_cpu_temp, NULL, 2);
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static SENSOR_DEVICE_ATTR(temp2_label, 0444, cpu_temp_label, NULL, 2);
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static SENSOR_DEVICE_ATTR(temp3_input, 0444, get_cpu_temp, NULL, 3);
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static SENSOR_DEVICE_ATTR(temp3_label, 0444, cpu_temp_label, NULL, 3);
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static SENSOR_DEVICE_ATTR(temp4_input, 0444, get_cpu_temp, NULL, 4);
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static SENSOR_DEVICE_ATTR(temp4_label, 0444, cpu_temp_label, NULL, 4);
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static struct attribute *cpu_hwmon_attributes[] = {
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp1_label.dev_attr.attr,
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&sensor_dev_attr_temp2_input.dev_attr.attr,
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&sensor_dev_attr_temp2_label.dev_attr.attr,
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&sensor_dev_attr_temp3_input.dev_attr.attr,
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&sensor_dev_attr_temp3_label.dev_attr.attr,
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&sensor_dev_attr_temp4_input.dev_attr.attr,
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&sensor_dev_attr_temp4_label.dev_attr.attr,
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NULL
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};
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static umode_t cpu_hwmon_is_visible(struct kobject *kobj,
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struct attribute *attr, int i)
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{
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int id = i / 2;
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if (id < nr_packages)
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return attr->mode;
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return 0;
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}
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static struct attribute_group cpu_hwmon_group = {
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.attrs = cpu_hwmon_attributes,
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.is_visible = cpu_hwmon_is_visible,
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};
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static const struct attribute_group *cpu_hwmon_groups[] = {
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&cpu_hwmon_group,
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NULL
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};
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#define CPU_THERMAL_THRESHOLD 90000
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static struct delayed_work thermal_work;
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static void do_thermal_timer(struct work_struct *work)
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{
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int i, value;
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for (i = 0; i < nr_packages; i++) {
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value = loongson3_cpu_temp(i);
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if (value > CPU_THERMAL_THRESHOLD) {
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pr_emerg("Power off due to high temp: %d\n", value);
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orderly_poweroff(true);
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}
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}
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schedule_delayed_work(&thermal_work, msecs_to_jiffies(5000));
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}
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static int __init loongson_hwmon_init(void)
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{
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pr_info("Loongson Hwmon Enter...\n");
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if (cpu_has_csr())
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csr_temp_enable = csr_readl(LOONGSON_CSR_FEATURES) &
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LOONGSON_CSRF_TEMP;
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nr_packages = loongson_sysconf.nr_cpus /
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loongson_sysconf.cores_per_package;
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cpu_hwmon_dev = hwmon_device_register_with_groups(NULL, "cpu_hwmon",
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NULL, cpu_hwmon_groups);
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if (IS_ERR(cpu_hwmon_dev)) {
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pr_err("hwmon_device_register fail!\n");
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return PTR_ERR(cpu_hwmon_dev);
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}
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INIT_DEFERRABLE_WORK(&thermal_work, do_thermal_timer);
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schedule_delayed_work(&thermal_work, msecs_to_jiffies(20000));
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return 0;
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}
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static void __exit loongson_hwmon_exit(void)
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{
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cancel_delayed_work_sync(&thermal_work);
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hwmon_device_unregister(cpu_hwmon_dev);
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}
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module_init(loongson_hwmon_init);
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module_exit(loongson_hwmon_exit);
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MODULE_AUTHOR("Yu Xiang <xiangy@lemote.com>");
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MODULE_AUTHOR("Huacai Chen <chenhc@lemote.com>");
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MODULE_DESCRIPTION("Loongson CPU Hwmon driver");
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MODULE_LICENSE("GPL");
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