Date:   Wed, 9 Nov 2022 16:09:36 +0800
From:   Yinbo Zhu <zhuyinbo@...ngson.cn>
To:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     zhanghongchen <zhanghongchen@...ngson.cn>,
        Liu Peibao <liupeibao@...ngson.cn>
Subject: Re: [PATCH v10 1/2] thermal: loongson-2: add thermal management
 support

Hi Rafael J.Wysocki,

I just have a verified on your tree about my patch again, it is okay,
if no other proplems, please help merge it to your tree and sync it to 
linux mainline tree.

Thanks,
Yinbo.

在 2022/11/3 下午4:34, Yinbo Zhu 写道:
> This patch adds the support for Loongson-2 thermal sensor controller,
> which can support maximum 4 sensors.
> 
> It's based on thermal of framework:
>   - Trip points defined in device tree.
>   - Cpufreq as cooling device registered in Loongson-2 cpufreq driver.
>   - Pwm fan as cooling device registered in hwmon pwm-fan driver.
> 
> Signed-off-by: zhanghongchen <zhanghongchen@...ngson.cn>
> Signed-off-by: Yinbo Zhu <zhuyinbo@...ngson.cn>
> ---
> Change in v10:
> 		1. Add all history change log information.
> Change in v9:
> 		1. Switch new API that use devm_thermal_of_zone_register
> 		   to replace previous interfaces.
> 		2. Add depend on LOONGARCH || COMPILE_TEST.
> Change in v8:
>                  1. Replace string loongson2/Loongson2/LOONGSON2 with loongson-2/
>                     Loongson-2/LOONGSON-2 in Kconfig and commit log and MAINTAINERS
> 		   files.
> Change in v7:
> 		1. Split the modification of patch 3 and merge it into this patch.
> 		2. Remove the unless code annotation to fix the compile warning
> 		   when compile C code with W=1.
> Change in v6:
> 		1. NO change, but other patch in this series of patches set has
> 		   changes.
> Change in v5:
> 		1. NO change, but other patch in this series of patches set has
> 		   changes.
> Change in v4:
> 		1. Fixup the compatible.
> Change in v3:
> 		1. Add a function to gain sensor id an remove dts id.
> Change in v2:
> 		1. Remove error msg printing when addr ioremap has error.
> 		2. Make loongson2 thermal driver was built-in by default.
> 		3. Replace ls2k with loongson2.
> 		4. Remove CONFIG_PM_SLEEP and set pm function type was
> 		   __maybe_unused.
> 
>   MAINTAINERS                         |   7 +
>   drivers/thermal/Kconfig             |  10 ++
>   drivers/thermal/Makefile            |   1 +
>   drivers/thermal/loongson2_thermal.c | 266 ++++++++++++++++++++++++++++
>   4 files changed, 284 insertions(+)
>   create mode 100644 drivers/thermal/loongson2_thermal.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 379945f82a64..37ab451d9258 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -12010,6 +12010,13 @@ F:	drivers/*/*loongarch*
>   F:	Documentation/loongarch/
>   F:	Documentation/translations/zh_CN/loongarch/
>   
> +LOONGSON-2 SOC SERIES THERMAL DRIVER
> +M:	zhanghongchen <zhanghongchen@...ngson.cn>
> +M:	Yinbo Zhu <zhuyinbo@...ngson.cn>
> +L:	linux-pm@...r.kernel.org
> +S:	Maintained
> +F:	drivers/thermal/loongson2_thermal.c
> +
>   LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI)
>   M:	Sathya Prakash <sathya.prakash@...adcom.com>
>   M:	Sreekanth Reddy <sreekanth.reddy@...adcom.com>
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index e052dae614eb..93d84bcb16dd 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -504,4 +504,14 @@ config KHADAS_MCU_FAN_THERMAL
>   	  If you say yes here you get support for the FAN controlled
>   	  by the Microcontroller found on the Khadas VIM boards.
>   
> +config LOONGSON2_THERMAL
> +	tristate "Loongson-2 SoC series thermal driver"
> +	depends on LOONGARCH || COMPILE_TEST
> +	depends on OF
> +	help
> +	  Support for Thermal driver found on Loongson-2 SoC series platforms.
> +	  It supports one critical trip point and one passive trip point. The
> +	  cpufreq and the pwm fan is used as the cooling device to throttle
> +	  CPUs when the passive trip is crossed.
> +
>   endif
> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> index 2506c6c8ca83..02f3db809858 100644
> --- a/drivers/thermal/Makefile
> +++ b/drivers/thermal/Makefile
> @@ -61,3 +61,4 @@ obj-$(CONFIG_UNIPHIER_THERMAL)	+= uniphier_thermal.o
>   obj-$(CONFIG_AMLOGIC_THERMAL)     += amlogic_thermal.o
>   obj-$(CONFIG_SPRD_THERMAL)	+= sprd_thermal.o
>   obj-$(CONFIG_KHADAS_MCU_FAN_THERMAL)	+= khadas_mcu_fan.o
> +obj-$(CONFIG_LOONGSON2_THERMAL)	+= loongson2_thermal.o
> diff --git a/drivers/thermal/loongson2_thermal.c b/drivers/thermal/loongson2_thermal.c
> new file mode 100644
> index 000000000000..87b07731f17e
> --- /dev/null
> +++ b/drivers/thermal/loongson2_thermal.c
> @@ -0,0 +1,266 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Author: zhanghongchen <zhanghongchen@...ngson.cn>
> + *         Yinbo Zhu <zhuyinbo@...ngson.cn>
> + * Copyright (C) 2022-2023 Loongson Technology Corporation Limited
> + */
> +
> +#include <linux/cpufreq.h>
> +#include <linux/delay.h>
> +#include <linux/interrupt.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/io.h>
> +#include <linux/of_device.h>
> +#include <linux/thermal.h>
> +#include "thermal_hwmon.h"
> +
> +#define LOONGSON2_SOC_MAX_SENSOR_NUM			4
> +
> +#define LOONGSON2_TSENSOR_CTRL_HI			0x0
> +#define LOONGSON2_TSENSOR_CTRL_LO			0x8
> +#define LOONGSON2_TSENSOR_STATUS			0x10
> +#define LOONGSON2_TSENSOR_OUT				0x14
> +
> +struct loongson2_thermal_data {
> +	struct thermal_zone_device *tzd;
> +	int irq;
> +	int id;
> +	void __iomem *regs;
> +	struct platform_device *pdev;
> +	u16 ctrl_low_val;
> +	u16 ctrl_hi_val;
> +};
> +
> +static int loongson2_thermal_set(struct loongson2_thermal_data *data,
> +					int low, int high, bool enable)
> +{
> +	u64 reg_ctrl = 0;
> +	int reg_off = data->id * 2;
> +
> +	if (low > high)
> +		return -EINVAL;
> +
> +	low = low < -100 ? -100 : low;
> +	high = high > 155 ? 155 : high;
> +
> +	low += 100;
> +	high += 100;
> +
> +	reg_ctrl |= low;
> +	reg_ctrl |= enable ? 0x100 : 0;
> +	writew(reg_ctrl, data->regs + LOONGSON2_TSENSOR_CTRL_LO + reg_off);
> +
> +	reg_ctrl = 0;
> +	reg_ctrl |= high;
> +	reg_ctrl |= enable ? 0x100 : 0;
> +	writew(reg_ctrl, data->regs + LOONGSON2_TSENSOR_CTRL_HI + reg_off);
> +
> +	return 0;
> +}
> +
> +static int loongson2_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
> +{
> +	u32 reg_val;
> +	struct loongson2_thermal_data *data = tz->devdata;
> +
> +	reg_val = readl(data->regs + LOONGSON2_TSENSOR_OUT);
> +	*temp = ((reg_val & 0xff) - 100) * 1000;
> +
> +	return 0;
> +}
> +
> +static int loongson2_thermal_get_sensor_id(void)
> +{
> +	int ret, id;
> +	struct of_phandle_args sensor_specs;
> +	struct device_node *np, *sensor_np;
> +
> +	np = of_find_node_by_name(NULL, "thermal-zones");
> +	if (!np)
> +		return -ENODEV;
> +
> +	sensor_np = of_get_next_child(np, NULL);
> +	ret = of_parse_phandle_with_args(sensor_np, "thermal-sensors",
> +			"#thermal-sensor-cells",
> +			0, &sensor_specs);
> +	if (ret) {
> +		of_node_put(np);
> +		of_node_put(sensor_np);
> +		return ret;
> +	}
> +
> +	if (sensor_specs.args_count >= 1) {
> +		id = sensor_specs.args[0];
> +		WARN(sensor_specs.args_count > 1,
> +				"%s: too many cells in sensor specifier %d\n",
> +				sensor_specs.np->name, sensor_specs.args_count);
> +	} else {
> +		id = 0;
> +	}
> +
> +	of_node_put(np);
> +	of_node_put(sensor_np);
> +
> +	return id;
> +}
> +
> +static irqreturn_t loongson2_thermal_alarm_irq(int irq, void *dev)
> +{
> +	struct loongson2_thermal_data *data = dev;
> +
> +	/* clear interrupt */
> +	writeb(0x3, data->regs + LOONGSON2_TSENSOR_STATUS);
> +
> +	disable_irq_nosync(irq);
> +
> +	return IRQ_WAKE_THREAD;
> +}
> +
> +static irqreturn_t loongson2_thermal_irq_thread(int irq, void *dev)
> +{
> +	struct loongson2_thermal_data *data = dev;
> +
> +	thermal_zone_device_update(data->tzd,
> +				   THERMAL_EVENT_UNSPECIFIED);
> +	enable_irq(data->irq);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int loongson2_thermal_set_trips(struct thermal_zone_device *tz, int low, int high)
> +{
> +	struct loongson2_thermal_data *data = tz->devdata;
> +
> +	return loongson2_thermal_set(data, low/1000, high/1000, true);
> +}
> +
> +static const struct thermal_zone_device_ops loongson2_of_thermal_ops = {
> +	.get_temp = loongson2_thermal_get_temp,
> +	.set_trips = loongson2_thermal_set_trips,
> +};
> +
> +static int loongson2_thermal_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct resource *res;
> +	struct loongson2_thermal_data *data;
> +	int ret;
> +
> +	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> +	if (!data)
> +		return -ENOMEM;
> +
> +	data->pdev = pdev;
> +	platform_set_drvdata(pdev, data);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	data->regs = devm_ioremap(dev, res->start, resource_size(res));
> +	if (IS_ERR(data->regs))
> +		return PTR_ERR(data->regs);
> +
> +	/* get irq */
> +	data->irq = platform_get_irq(pdev, 0);
> +	if (data->irq < 0)
> +		return data->irq;
> +
> +	/* get id */
> +	data->id = loongson2_thermal_get_sensor_id();
> +	if (data->id > LOONGSON2_SOC_MAX_SENSOR_NUM - 1 || data->id < 0) {
> +		dev_err(dev, "sensor id error,must be in <0 ~ %d>\n",
> +				LOONGSON2_SOC_MAX_SENSOR_NUM - 1);
> +		return -EINVAL;
> +	}
> +
> +	writeb(0xff, data->regs + LOONGSON2_TSENSOR_STATUS);
> +
> +	loongson2_thermal_set(data, 0, 0, false);
> +
> +	data->tzd = devm_thermal_of_zone_register(&pdev->dev,
> +							   data->id, data,
> +							   &loongson2_of_thermal_ops);
> +	if (IS_ERR(data->tzd)) {
> +		ret = PTR_ERR(data->tzd);
> +		data->tzd = NULL;
> +		dev_err(&pdev->dev, "failed to register %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = devm_request_threaded_irq(dev, data->irq,
> +			loongson2_thermal_alarm_irq, loongson2_thermal_irq_thread,
> +			IRQF_ONESHOT, "loongson2_thermal", data);
> +	if (ret < 0) {
> +		dev_err(dev, "failed to request alarm irq: %d\n", ret);
> +		return ret;
> +	}
> +
> +	/*
> +	 * Thermal_zone doesn't enable hwmon as default,
> +	 * enable it here
> +	 */
> +	data->tzd->tzp->no_hwmon = false;
> +	ret = thermal_add_hwmon_sysfs(data->tzd);
> +	if (ret) {
> +		dev_err(dev, "failed to add hwmon sysfs interface %d\n", ret);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int loongson2_thermal_remove(struct platform_device *pdev)
> +{
> +	struct loongson2_thermal_data *data = platform_get_drvdata(pdev);
> +	int reg_off = data->id * 2;
> +
> +	/* disable interrupt */
> +	writew(0, data->regs + LOONGSON2_TSENSOR_CTRL_LO + reg_off);
> +	writew(0, data->regs + LOONGSON2_TSENSOR_CTRL_HI + reg_off);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id of_loongson2_thermal_match[] = {
> +	{ .compatible = "loongson,ls2k-thermal",},
> +	{ /* end */ }
> +};
> +MODULE_DEVICE_TABLE(of, of_loongson2_thermal_match);
> +
> +static int __maybe_unused loongson2_thermal_suspend(struct device *dev)
> +{
> +	struct loongson2_thermal_data *data = dev_get_drvdata(dev);
> +	int reg_off = data->id * 2;
> +
> +	data->ctrl_low_val = readw(data->regs + LOONGSON2_TSENSOR_CTRL_LO + reg_off);
> +	data->ctrl_hi_val = readw(data->regs + LOONGSON2_TSENSOR_CTRL_HI + reg_off);
> +
> +	writew(0, data->regs + LOONGSON2_TSENSOR_CTRL_LO + reg_off);
> +	writew(0, data->regs + LOONGSON2_TSENSOR_CTRL_HI + reg_off);
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused loongson2_thermal_resume(struct device *dev)
> +{
> +	struct loongson2_thermal_data *data = dev_get_drvdata(dev);
> +	int reg_off = data->id * 2;
> +
> +	writew(data->ctrl_low_val, data->regs + LOONGSON2_TSENSOR_CTRL_LO + reg_off);
> +	writew(data->ctrl_hi_val, data->regs + LOONGSON2_TSENSOR_CTRL_HI + reg_off);
> +
> +	return 0;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(loongson2_thermal_pm_ops,
> +			 loongson2_thermal_suspend, loongson2_thermal_resume);
> +
> +static struct platform_driver loongson2_thermal_driver = {
> +	.driver = {
> +		.name		= "loongson2_thermal",
> +		.pm = &loongson2_thermal_pm_ops,
> +		.of_match_table = of_loongson2_thermal_match,
> +	},
> +	.probe	= loongson2_thermal_probe,
> +	.remove	= loongson2_thermal_remove,
> +};
> +module_platform_driver(loongson2_thermal_driver);
> 

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