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 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 66 static 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 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 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 NULL 94 }; 95 96 static 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 } 105 106 static struct attribute_group cpu_hwmon_group = { 107 .attrs = cpu_hwmon_attributes, 108 .is_visible = cpu_hwmon_is_visible, 109 }; 110 111 static const struct attribute_group *cpu_hwmon_groups[] = { 112 &cpu_hwmon_group, 113 NULL 114 }; 115 116 #define CPU_THERMAL_THRESHOLD 90000 117 static struct delayed_work thermal_work; 118 119 static 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 } 133 134 static 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 } 160 161 static void __exit loongson_hwmon_exit(void) 162 { 163 cancel_delayed_work_sync(&thermal_work); 164 hwmon_device_unregister(cpu_hwmon_dev); 165 } 166 167 module_init(loongson_hwmon_init); 168 module_exit(loongson_hwmon_exit); 169 170 MODULE_AUTHOR("Yu Xiang <xiangy@lemote.com>"); 171 MODULE_AUTHOR("Huacai Chen <chenhc@lemote.com>"); 172 MODULE_DESCRIPTION("Loongson CPU Hwmon driver"); 173 MODULE_LICENSE("GPL"); 174