1 // SPDX-License-Identifier: GPL-2.0-only 2 #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 14 static 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 sensor0 21 */ 22 int 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 51 out: 52 return (int)reg * 1000; 53 } 54 55 static int nr_packages; 56 static struct device *cpu_hwmon_dev; 57 58 static SENSOR_DEVICE_ATTR(name, 0444, NULL, NULL, 0); 59 60 static struct attribute *cpu_hwmon_attributes[] = { 61 &sensor_dev_attr_name.dev_attr.attr, 62 NULL 63 }; 64 65 /* Hwmon device attribute group */ 66 static struct attribute_group cpu_hwmon_attribute_group = { 67 .attrs = cpu_hwmon_attributes, 68 }; 69 70 static ssize_t get_cpu_temp(struct device *dev, 71 struct device_attribute *attr, char *buf); 72 static ssize_t cpu_temp_label(struct device *dev, 73 struct device_attribute *attr, char *buf); 74 75 static SENSOR_DEVICE_ATTR(temp1_input, 0444, get_cpu_temp, NULL, 1); 76 static SENSOR_DEVICE_ATTR(temp1_label, 0444, cpu_temp_label, NULL, 1); 77 static SENSOR_DEVICE_ATTR(temp2_input, 0444, get_cpu_temp, NULL, 2); 78 static SENSOR_DEVICE_ATTR(temp2_label, 0444, cpu_temp_label, NULL, 2); 79 static SENSOR_DEVICE_ATTR(temp3_input, 0444, get_cpu_temp, NULL, 3); 80 static SENSOR_DEVICE_ATTR(temp3_label, 0444, cpu_temp_label, NULL, 3); 81 static SENSOR_DEVICE_ATTR(temp4_input, 0444, get_cpu_temp, NULL, 4); 82 static SENSOR_DEVICE_ATTR(temp4_label, 0444, cpu_temp_label, NULL, 4); 83 84 static const struct attribute *hwmon_cputemp[4][3] = { 85 { 86 &sensor_dev_attr_temp1_input.dev_attr.attr, 87 &sensor_dev_attr_temp1_label.dev_attr.attr, 88 NULL 89 }, 90 { 91 &sensor_dev_attr_temp2_input.dev_attr.attr, 92 &sensor_dev_attr_temp2_label.dev_attr.attr, 93 NULL 94 }, 95 { 96 &sensor_dev_attr_temp3_input.dev_attr.attr, 97 &sensor_dev_attr_temp3_label.dev_attr.attr, 98 NULL 99 }, 100 { 101 &sensor_dev_attr_temp4_input.dev_attr.attr, 102 &sensor_dev_attr_temp4_label.dev_attr.attr, 103 NULL 104 } 105 }; 106 107 static ssize_t cpu_temp_label(struct device *dev, 108 struct device_attribute *attr, char *buf) 109 { 110 int id = (to_sensor_dev_attr(attr))->index - 1; 111 112 return sprintf(buf, "CPU %d Temperature\n", id); 113 } 114 115 static ssize_t get_cpu_temp(struct device *dev, 116 struct device_attribute *attr, char *buf) 117 { 118 int id = (to_sensor_dev_attr(attr))->index - 1; 119 int value = loongson3_cpu_temp(id); 120 121 return sprintf(buf, "%d\n", value); 122 } 123 124 static int create_sysfs_cputemp_files(struct kobject *kobj) 125 { 126 int i, ret = 0; 127 128 for (i = 0; i < nr_packages; i++) 129 ret = sysfs_create_files(kobj, hwmon_cputemp[i]); 130 131 return ret; 132 } 133 134 static void remove_sysfs_cputemp_files(struct kobject *kobj) 135 { 136 int i; 137 138 for (i = 0; i < nr_packages; i++) 139 sysfs_remove_files(kobj, hwmon_cputemp[i]); 140 } 141 142 #define CPU_THERMAL_THRESHOLD 90000 143 static struct delayed_work thermal_work; 144 145 static void do_thermal_timer(struct work_struct *work) 146 { 147 int i, value; 148 149 for (i = 0; i < nr_packages; i++) { 150 value = loongson3_cpu_temp(i); 151 if (value > CPU_THERMAL_THRESHOLD) { 152 pr_emerg("Power off due to high temp: %d\n", value); 153 orderly_poweroff(true); 154 } 155 } 156 157 schedule_delayed_work(&thermal_work, msecs_to_jiffies(5000)); 158 } 159 160 static int __init loongson_hwmon_init(void) 161 { 162 int ret; 163 164 pr_info("Loongson Hwmon Enter...\n"); 165 166 if (cpu_has_csr()) 167 csr_temp_enable = csr_readl(LOONGSON_CSR_FEATURES) & 168 LOONGSON_CSRF_TEMP; 169 170 cpu_hwmon_dev = hwmon_device_register_with_info(NULL, "cpu_hwmon", NULL, NULL, NULL); 171 if (IS_ERR(cpu_hwmon_dev)) { 172 ret = PTR_ERR(cpu_hwmon_dev); 173 pr_err("hwmon_device_register fail!\n"); 174 goto fail_hwmon_device_register; 175 } 176 177 nr_packages = loongson_sysconf.nr_cpus / 178 loongson_sysconf.cores_per_package; 179 180 ret = create_sysfs_cputemp_files(&cpu_hwmon_dev->kobj); 181 if (ret) { 182 pr_err("fail to create cpu temperature interface!\n"); 183 goto fail_create_sysfs_cputemp_files; 184 } 185 186 INIT_DEFERRABLE_WORK(&thermal_work, do_thermal_timer); 187 schedule_delayed_work(&thermal_work, msecs_to_jiffies(20000)); 188 189 return ret; 190 191 fail_create_sysfs_cputemp_files: 192 sysfs_remove_group(&cpu_hwmon_dev->kobj, 193 &cpu_hwmon_attribute_group); 194 hwmon_device_unregister(cpu_hwmon_dev); 195 196 fail_hwmon_device_register: 197 return ret; 198 } 199 200 static void __exit loongson_hwmon_exit(void) 201 { 202 cancel_delayed_work_sync(&thermal_work); 203 remove_sysfs_cputemp_files(&cpu_hwmon_dev->kobj); 204 sysfs_remove_group(&cpu_hwmon_dev->kobj, 205 &cpu_hwmon_attribute_group); 206 hwmon_device_unregister(cpu_hwmon_dev); 207 } 208 209 module_init(loongson_hwmon_init); 210 module_exit(loongson_hwmon_exit); 211 212 MODULE_AUTHOR("Yu Xiang <xiangy@lemote.com>"); 213 MODULE_AUTHOR("Huacai Chen <chenhc@lemote.com>"); 214 MODULE_DESCRIPTION("Loongson CPU Hwmon driver"); 215 MODULE_LICENSE("GPL"); 216