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1// SPDX-License-Identifier: GPL-2.0-only2#include <linux/err.h>3#include <linux/module.h>4#include <linux/reboot.h>5#include <linux/jiffies.h>6#include <linux/hwmon.h>7#include <linux/hwmon-sysfs.h>8 9#include <loongson.h>10#include <boot_param.h>11#include <loongson_hwmon.h>12#include <loongson_regs.h>13 14static int csr_temp_enable;15 16/*17 * Loongson-3 series cpu has two sensors inside,18 * each of them from 0 to 255,19 * if more than 127, that is dangerous.20 * here only provide sensor1 data, because it always hot than sensor021 */22int loongson3_cpu_temp(int cpu)23{24 u32 reg, prid_rev;25 26 if (csr_temp_enable) {27 reg = (csr_readl(LOONGSON_CSR_CPUTEMP) & 0xff);28 goto out;29 }30 31 reg = LOONGSON_CHIPTEMP(cpu);32 prid_rev = read_c0_prid() & PRID_REV_MASK;33 34 switch (prid_rev) {35 case PRID_REV_LOONGSON3A_R1:36 reg = (reg >> 8) & 0xff;37 break;38 case PRID_REV_LOONGSON3B_R1:39 case PRID_REV_LOONGSON3B_R2:40 case PRID_REV_LOONGSON3A_R2_0:41 case PRID_REV_LOONGSON3A_R2_1:42 reg = ((reg >> 8) & 0xff) - 100;43 break;44 case PRID_REV_LOONGSON3A_R3_0:45 case PRID_REV_LOONGSON3A_R3_1:46 default:47 reg = (reg & 0xffff) * 731 / 0x4000 - 273;48 break;49 }50 51out:52 return (int)reg * 1000;53}54 55static int nr_packages;56static struct device *cpu_hwmon_dev;57 58static ssize_t cpu_temp_label(struct device *dev,59 struct device_attribute *attr, char *buf)60{61 int id = (to_sensor_dev_attr(attr))->index - 1;62 63 return sprintf(buf, "CPU %d Temperature\n", id);64}65 66static ssize_t get_cpu_temp(struct device *dev,67 struct device_attribute *attr, char *buf)68{69 int id = (to_sensor_dev_attr(attr))->index - 1;70 int value = loongson3_cpu_temp(id);71 72 return sprintf(buf, "%d\n", value);73}74 75static SENSOR_DEVICE_ATTR(temp1_input, 0444, get_cpu_temp, NULL, 1);76static SENSOR_DEVICE_ATTR(temp1_label, 0444, cpu_temp_label, NULL, 1);77static SENSOR_DEVICE_ATTR(temp2_input, 0444, get_cpu_temp, NULL, 2);78static SENSOR_DEVICE_ATTR(temp2_label, 0444, cpu_temp_label, NULL, 2);79static SENSOR_DEVICE_ATTR(temp3_input, 0444, get_cpu_temp, NULL, 3);80static SENSOR_DEVICE_ATTR(temp3_label, 0444, cpu_temp_label, NULL, 3);81static SENSOR_DEVICE_ATTR(temp4_input, 0444, get_cpu_temp, NULL, 4);82static SENSOR_DEVICE_ATTR(temp4_label, 0444, cpu_temp_label, NULL, 4);83 84static struct attribute *cpu_hwmon_attributes[] = {85 &sensor_dev_attr_temp1_input.dev_attr.attr,86 &sensor_dev_attr_temp1_label.dev_attr.attr,87 &sensor_dev_attr_temp2_input.dev_attr.attr,88 &sensor_dev_attr_temp2_label.dev_attr.attr,89 &sensor_dev_attr_temp3_input.dev_attr.attr,90 &sensor_dev_attr_temp3_label.dev_attr.attr,91 &sensor_dev_attr_temp4_input.dev_attr.attr,92 &sensor_dev_attr_temp4_label.dev_attr.attr,93 NULL94};95 96static umode_t cpu_hwmon_is_visible(struct kobject *kobj,97 struct attribute *attr, int i)98{99 int id = i / 2;100 101 if (id < nr_packages)102 return attr->mode;103 return 0;104}105 106static struct attribute_group cpu_hwmon_group = {107 .attrs = cpu_hwmon_attributes,108 .is_visible = cpu_hwmon_is_visible,109};110 111static const struct attribute_group *cpu_hwmon_groups[] = {112 &cpu_hwmon_group,113 NULL114};115 116#define CPU_THERMAL_THRESHOLD 90000117static struct delayed_work thermal_work;118 119static void do_thermal_timer(struct work_struct *work)120{121 int i, value;122 123 for (i = 0; i < nr_packages; i++) {124 value = loongson3_cpu_temp(i);125 if (value > CPU_THERMAL_THRESHOLD) {126 pr_emerg("Power off due to high temp: %d\n", value);127 orderly_poweroff(true);128 }129 }130 131 schedule_delayed_work(&thermal_work, msecs_to_jiffies(5000));132}133 134static int __init loongson_hwmon_init(void)135{136 pr_info("Loongson Hwmon Enter...\n");137 138 if (cpu_has_csr())139 csr_temp_enable = csr_readl(LOONGSON_CSR_FEATURES) &140 LOONGSON_CSRF_TEMP;141 142 if (!csr_temp_enable && !loongson_chiptemp[0])143 return -ENODEV;144 145 nr_packages = loongson_sysconf.nr_cpus /146 loongson_sysconf.cores_per_package;147 148 cpu_hwmon_dev = hwmon_device_register_with_groups(NULL, "cpu_hwmon",149 NULL, cpu_hwmon_groups);150 if (IS_ERR(cpu_hwmon_dev)) {151 pr_err("hwmon_device_register fail!\n");152 return PTR_ERR(cpu_hwmon_dev);153 }154 155 INIT_DEFERRABLE_WORK(&thermal_work, do_thermal_timer);156 schedule_delayed_work(&thermal_work, msecs_to_jiffies(20000));157 158 return 0;159}160 161static void __exit loongson_hwmon_exit(void)162{163 cancel_delayed_work_sync(&thermal_work);164 hwmon_device_unregister(cpu_hwmon_dev);165}166 167module_init(loongson_hwmon_init);168module_exit(loongson_hwmon_exit);169 170MODULE_AUTHOR("Yu Xiang <xiangy@lemote.com>");171MODULE_AUTHOR("Huacai Chen <chenhc@lemote.com>");172MODULE_DESCRIPTION("Loongson CPU Hwmon driver");173MODULE_LICENSE("GPL");174