diff options
Diffstat (limited to 'drivers/platform/mips/cpu_hwmon.c')
| -rw-r--r-- | drivers/platform/mips/cpu_hwmon.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/drivers/platform/mips/cpu_hwmon.c b/drivers/platform/mips/cpu_hwmon.c new file mode 100644 index 000000000..d8c5f9195 --- /dev/null +++ b/drivers/platform/mips/cpu_hwmon.c @@ -0,0 +1,170 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include <linux/err.h> +#include <linux/module.h> +#include <linux/reboot.h> +#include <linux/jiffies.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> + +#include <loongson.h> +#include <boot_param.h> +#include <loongson_hwmon.h> +#include <loongson_regs.h> + +static int csr_temp_enable; + +/* + * Loongson-3 series cpu has two sensors inside, + * each of them from 0 to 255, + * if more than 127, that is dangerous. + * here only provide sensor1 data, because it always hot than sensor0 + */ +int loongson3_cpu_temp(int cpu) +{ + u32 reg, prid_rev; + + if (csr_temp_enable) { + reg = (csr_readl(LOONGSON_CSR_CPUTEMP) & 0xff); + goto out; + } + + reg = LOONGSON_CHIPTEMP(cpu); + prid_rev = read_c0_prid() & PRID_REV_MASK; + + switch (prid_rev) { + case PRID_REV_LOONGSON3A_R1: + reg = (reg >> 8) & 0xff; + break; + case PRID_REV_LOONGSON3B_R1: + case PRID_REV_LOONGSON3B_R2: + case PRID_REV_LOONGSON3A_R2_0: + case PRID_REV_LOONGSON3A_R2_1: + reg = ((reg >> 8) & 0xff) - 100; + break; + case PRID_REV_LOONGSON3A_R3_0: + case PRID_REV_LOONGSON3A_R3_1: + default: + reg = (reg & 0xffff) * 731 / 0x4000 - 273; + break; + } + +out: + return (int)reg * 1000; +} + +static int nr_packages; +static struct device *cpu_hwmon_dev; + +static ssize_t cpu_temp_label(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int id = (to_sensor_dev_attr(attr))->index - 1; + + return sprintf(buf, "CPU %d Temperature\n", id); +} + +static ssize_t get_cpu_temp(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int id = (to_sensor_dev_attr(attr))->index - 1; + int value = loongson3_cpu_temp(id); + + return sprintf(buf, "%d\n", value); +} + +static SENSOR_DEVICE_ATTR(temp1_input, 0444, get_cpu_temp, NULL, 1); +static SENSOR_DEVICE_ATTR(temp1_label, 0444, cpu_temp_label, NULL, 1); +static SENSOR_DEVICE_ATTR(temp2_input, 0444, get_cpu_temp, NULL, 2); +static SENSOR_DEVICE_ATTR(temp2_label, 0444, cpu_temp_label, NULL, 2); +static SENSOR_DEVICE_ATTR(temp3_input, 0444, get_cpu_temp, NULL, 3); +static SENSOR_DEVICE_ATTR(temp3_label, 0444, cpu_temp_label, NULL, 3); +static SENSOR_DEVICE_ATTR(temp4_input, 0444, get_cpu_temp, NULL, 4); +static SENSOR_DEVICE_ATTR(temp4_label, 0444, cpu_temp_label, NULL, 4); + +static struct attribute *cpu_hwmon_attributes[] = { + &sensor_dev_attr_temp1_input.dev_attr.attr, + &sensor_dev_attr_temp1_label.dev_attr.attr, + &sensor_dev_attr_temp2_input.dev_attr.attr, + &sensor_dev_attr_temp2_label.dev_attr.attr, + &sensor_dev_attr_temp3_input.dev_attr.attr, + &sensor_dev_attr_temp3_label.dev_attr.attr, + &sensor_dev_attr_temp4_input.dev_attr.attr, + &sensor_dev_attr_temp4_label.dev_attr.attr, + NULL +}; + +static umode_t cpu_hwmon_is_visible(struct kobject *kobj, + struct attribute *attr, int i) +{ + int id = i / 2; + + if (id < nr_packages) + return attr->mode; + return 0; +} + +static struct attribute_group cpu_hwmon_group = { + .attrs = cpu_hwmon_attributes, + .is_visible = cpu_hwmon_is_visible, +}; + +static const struct attribute_group *cpu_hwmon_groups[] = { + &cpu_hwmon_group, + NULL +}; + +#define CPU_THERMAL_THRESHOLD 90000 +static struct delayed_work thermal_work; + +static void do_thermal_timer(struct work_struct *work) +{ + int i, value; + + for (i = 0; i < nr_packages; i++) { + value = loongson3_cpu_temp(i); + if (value > CPU_THERMAL_THRESHOLD) { + pr_emerg("Power off due to high temp: %d\n", value); + orderly_poweroff(true); + } + } + + schedule_delayed_work(&thermal_work, msecs_to_jiffies(5000)); +} + +static int __init loongson_hwmon_init(void) +{ + pr_info("Loongson Hwmon Enter...\n"); + + if (cpu_has_csr()) + csr_temp_enable = csr_readl(LOONGSON_CSR_FEATURES) & + LOONGSON_CSRF_TEMP; + + nr_packages = loongson_sysconf.nr_cpus / + loongson_sysconf.cores_per_package; + + cpu_hwmon_dev = hwmon_device_register_with_groups(NULL, "cpu_hwmon", + NULL, cpu_hwmon_groups); + if (IS_ERR(cpu_hwmon_dev)) { + pr_err("hwmon_device_register fail!\n"); + return PTR_ERR(cpu_hwmon_dev); + } + + INIT_DEFERRABLE_WORK(&thermal_work, do_thermal_timer); + schedule_delayed_work(&thermal_work, msecs_to_jiffies(20000)); + + return 0; +} + +static void __exit loongson_hwmon_exit(void) +{ + cancel_delayed_work_sync(&thermal_work); + hwmon_device_unregister(cpu_hwmon_dev); +} + +module_init(loongson_hwmon_init); +module_exit(loongson_hwmon_exit); + +MODULE_AUTHOR("Yu Xiang <xiangy@lemote.com>"); +MODULE_AUTHOR("Huacai Chen <chenhc@lemote.com>"); +MODULE_DESCRIPTION("Loongson CPU Hwmon driver"); +MODULE_LICENSE("GPL"); |