Commit bcc26b27 authored by gaojuxin's avatar gaojuxin Committed by Hongchen Zhang
Browse files

LoongArch: Add CPU HWMon platform driver 

LoongArch inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/IBEN7V


CVE: NA

--------------------------------

This add CPU HWMon (temperature sensor) platform driver for Loongson-3.

Change-Id: I1d4c0e0a305f25f2b1ddfe27f371b40fa1689f9e
Tested-by: default avatarXi Ruoyao <xry111@xry111.site>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
Signed-off-by: default avatarKexy Biscuit <kexybiscuit@aosc.io>
Signed-off-by: default avatargaojuxin <gaojuxin@loongson.cn>
parent 1e531b83

drivers/platform/loongarch/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -16,6 +16,14 @@ menuconfig LOONGARCH_PLATFORM_DEVICES 


if LOONGARCH_PLATFORM_DEVICES



config CPU_HWMON

	bool "Loongson CPU HWMon Driver"

	depends on MACH_LOONGSON64

	select HWMON

	default y

	help

	  Loongson-3A/3B/3C CPU HWMon (temperature sensor) driver.



config LOONGSON_LAPTOP

	tristate "Generic Loongson-3 Laptop Driver"

	depends on ACPI

drivers/platform/loongarch/Makefile

+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_LOONGSON_LAPTOP) += loongson-laptop.o

obj-$(CONFIG_CPU_HWMON) += cpu_hwmon.o

drivers/platform/loongarch/cpu_hwmon.c

0 → 100644
+196 −0
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// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright (C) 2022 Loongson Technology Corporation Limited

 */

#include <linux/module.h>

#include <linux/reboot.h>

#include <linux/jiffies.h>

#include <linux/hwmon.h>

#include <linux/hwmon-sysfs.h>



#include <asm/loongson.h>



static int nr_packages;

static struct device *cpu_hwmon_dev;



static int loongson3_cpu_temp(int cpu)

{

	u32 reg;



	reg = iocsr_read32(LOONGARCH_IOCSR_CPUTEMP) & 0xff;



	return (int)((s8)reg) * 1000;

}



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 SENSOR_DEVICE_ATTR(temp5_input, 0444, get_cpu_temp, NULL, 4);

static SENSOR_DEVICE_ATTR(temp5_label, 0444, cpu_temp_label, NULL, 4);

static SENSOR_DEVICE_ATTR(temp6_input, 0444, get_cpu_temp, NULL, 4);

static SENSOR_DEVICE_ATTR(temp6_label, 0444, cpu_temp_label, NULL, 4);

static SENSOR_DEVICE_ATTR(temp7_input, 0444, get_cpu_temp, NULL, 4);

static SENSOR_DEVICE_ATTR(temp7_label, 0444, cpu_temp_label, NULL, 4);

static SENSOR_DEVICE_ATTR(temp8_input, 0444, get_cpu_temp, NULL, 4);

static SENSOR_DEVICE_ATTR(temp8_label, 0444, cpu_temp_label, NULL, 4);

static SENSOR_DEVICE_ATTR(temp9_input, 0444, get_cpu_temp, NULL, 4);

static SENSOR_DEVICE_ATTR(temp9_label, 0444, cpu_temp_label, NULL, 4);

static SENSOR_DEVICE_ATTR(temp10_input, 0444, get_cpu_temp, NULL, 4);

static SENSOR_DEVICE_ATTR(temp10_label, 0444, cpu_temp_label, NULL, 4);

static SENSOR_DEVICE_ATTR(temp11_input, 0444, get_cpu_temp, NULL, 4);

static SENSOR_DEVICE_ATTR(temp11_label, 0444, cpu_temp_label, NULL, 4);

static SENSOR_DEVICE_ATTR(temp12_input, 0444, get_cpu_temp, NULL, 4);

static SENSOR_DEVICE_ATTR(temp12_label, 0444, cpu_temp_label, NULL, 4);

static SENSOR_DEVICE_ATTR(temp13_input, 0444, get_cpu_temp, NULL, 4);

static SENSOR_DEVICE_ATTR(temp13_label, 0444, cpu_temp_label, NULL, 4);

static SENSOR_DEVICE_ATTR(temp14_input, 0444, get_cpu_temp, NULL, 4);

static SENSOR_DEVICE_ATTR(temp14_label, 0444, cpu_temp_label, NULL, 4);

static SENSOR_DEVICE_ATTR(temp15_input, 0444, get_cpu_temp, NULL, 4);

static SENSOR_DEVICE_ATTR(temp15_label, 0444, cpu_temp_label, NULL, 4);

static SENSOR_DEVICE_ATTR(temp16_input, 0444, get_cpu_temp, NULL, 4);

static SENSOR_DEVICE_ATTR(temp16_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,

	&sensor_dev_attr_temp5_input.dev_attr.attr,

	&sensor_dev_attr_temp5_label.dev_attr.attr,

	&sensor_dev_attr_temp6_input.dev_attr.attr,

	&sensor_dev_attr_temp6_label.dev_attr.attr,

	&sensor_dev_attr_temp7_input.dev_attr.attr,

	&sensor_dev_attr_temp7_label.dev_attr.attr,

	&sensor_dev_attr_temp8_input.dev_attr.attr,

	&sensor_dev_attr_temp8_label.dev_attr.attr,

	&sensor_dev_attr_temp9_input.dev_attr.attr,

	&sensor_dev_attr_temp9_label.dev_attr.attr,

	&sensor_dev_attr_temp10_input.dev_attr.attr,

	&sensor_dev_attr_temp10_label.dev_attr.attr,

	&sensor_dev_attr_temp11_input.dev_attr.attr,

	&sensor_dev_attr_temp11_label.dev_attr.attr,

	&sensor_dev_attr_temp12_input.dev_attr.attr,

	&sensor_dev_attr_temp12_label.dev_attr.attr,

	&sensor_dev_attr_temp13_input.dev_attr.attr,

	&sensor_dev_attr_temp13_label.dev_attr.attr,

	&sensor_dev_attr_temp14_input.dev_attr.attr,

	&sensor_dev_attr_temp14_label.dev_attr.attr,

	&sensor_dev_attr_temp15_input.dev_attr.attr,

	&sensor_dev_attr_temp15_label.dev_attr.attr,

	&sensor_dev_attr_temp16_input.dev_attr.attr,

	&sensor_dev_attr_temp16_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

};



static int cpu_initial_threshold = 72000;

static int cpu_thermal_threshold = 96000;

module_param(cpu_thermal_threshold, int, 0644);

MODULE_PARM_DESC(cpu_thermal_threshold, "cpu thermal threshold (96000 (default))");



static struct delayed_work thermal_work;



static void do_thermal_timer(struct work_struct *work)

{

	int i, value, temp_max = 0;



	for (i = 0; i < nr_packages; i++) {

		value = loongson3_cpu_temp(i);

		if (value > temp_max)

			temp_max = value;

	}



	if (temp_max <= cpu_thermal_threshold)

		schedule_delayed_work(&thermal_work, msecs_to_jiffies(5000));

	else

		orderly_poweroff(true);

}



static int __init loongson_hwmon_init(void)

{

	int i, value, temp_max = 0;



	pr_info("Loongson Hwmon Enter...\n");



	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 register fail with %ld!\n", PTR_ERR(cpu_hwmon_dev));

		return PTR_ERR(cpu_hwmon_dev);

	}



	for (i = 0; i < nr_packages; i++) {

		value = loongson3_cpu_temp(i);

		if (value > temp_max)

			temp_max = value;

	}



	pr_info("Initial CPU temperature is %d (highest).\n", temp_max);

	if (temp_max > cpu_initial_threshold)

		cpu_thermal_threshold += temp_max - cpu_initial_threshold;



	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("Huacai Chen <chenhuacai@loongson.cn>");

MODULE_DESCRIPTION("Loongson CPU Hwmon driver");

MODULE_LICENSE("GPL");