Date:	Thu, 26 Mar 2015 17:14:22 +0800
From:	YiPing Xu <xuyiping@...ilicon.com>
To:	Xinwei Kong <kong.kongxinwei@...ilicon.com>,
	<rui.zhuang@...el.com>, <edubezval@...il.com>
CC:	<devicetree@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	<linuxarm@...wei.com>, <linux-kernel@...r.kernel.org>,
	<liguozhu@...ilicon.com>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v1 1/2] thermal: hisilicon: add new hisilicon thermal
 sensor driver

在 2015/3/25 15:50, Xinwei Kong 写道:
> From: kongxinwei <kong.kongxinwei@...ilicon.com>
>
> This patch adds the support for hisilicon thermal sensor, within
> hisilicon SoC. there will register sensors for thermal framework
> and use device tree to bind cooling device.
>
> Signed-off-by: Leo Yan <leo.yan@...aro.org>
> Signed-off-by: kongxinwei <kong.kongxinwei@...ilicon.com>
> ---
>   drivers/thermal/Kconfig        |   8 +
>   drivers/thermal/Makefile       |   1 +
>   drivers/thermal/hisi_thermal.c | 526 +++++++++++++++++++++++++++++++++++++++++
>   3 files changed, 535 insertions(+)
>   create mode 100644 drivers/thermal/hisi_thermal.c
>
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index af40db0..81aee01 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -136,6 +136,14 @@ config THERMAL_EMULATION
>   	  because userland can easily disable the thermal policy by simply
>   	  flooding this sysfs node with low temperature values.
>
> +config HISI_THERMAL
> +	tristate "Hisilicon thermal driver"
> +	depends on ARCH_HISI && CPU_THERMAL && OF
> +	help
> +	  Enable this to plug hisilicon's thermal sensor driver into the Linux
> +	  thermal framework. cpufreq is used as the cooling device to throttle
> +	  CPUs when the passive trip is crossed.
> +
>   config IMX_THERMAL
>   	tristate "Temperature sensor driver for Freescale i.MX SoCs"
>   	depends on CPU_THERMAL
> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> index fa0dc48..08ae7ac 100644
> --- a/drivers/thermal/Makefile
> +++ b/drivers/thermal/Makefile
> @@ -39,3 +39,4 @@ obj-$(CONFIG_TI_SOC_THERMAL)	+= ti-soc-thermal/
>   obj-$(CONFIG_INT340X_THERMAL)  += int340x_thermal/
>   obj-$(CONFIG_ST_THERMAL)	+= st/
>   obj-$(CONFIG_TEGRA_SOCTHERM)	+= tegra_soctherm.o
> +obj-$(CONFIG_HISI_THERMAL)     += hisi_thermal.o
> diff --git a/drivers/thermal/hisi_thermal.c b/drivers/thermal/hisi_thermal.c
> new file mode 100644
> index 0000000..8edf83a
> --- /dev/null
> +++ b/drivers/thermal/hisi_thermal.c

    are you sure all the SOCs in hisilicon use the same thermal IP ?

    if not, this driver should not use the "hisi_" prefix.

> @@ -0,0 +1,526 @@
> +/*
> + * Hisilicon thermal sensor driver
> + *
> + * Copyright (c) 2014-2015 Hisilicon Limited.
> + * Copyright (c) 2014-2015 Linaro Limited.
> + *
> + * Xinwei Kong <kong.kongxinwei@...ilicon.com>
> + * Leo Yan <leo.yan@...aro.org>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/cpu_cooling.h>
> +#include <linux/cpufreq.h>
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +#include <linux/thermal.h>
> +#include <linux/types.h>
> +
> +#include "thermal_core.h"
> +
> +#define TEMP0_LAG			(0x0)
> +#define TEMP0_TH			(0x4)
> +#define TEMP0_RST_TH			(0x8)
> +#define TEMP0_CFG			(0xC)
> +#define TEMP0_EN			(0x10)
> +#define TEMP0_INT_EN			(0x14)
> +#define TEMP0_INT_CLR			(0x18)
> +#define TEMP0_RST_MSK			(0x1C)
> +#define TEMP0_RAW_INT			(0x20)
> +#define TEMP0_MSK_INT			(0x24)
> +#define TEMP0_VALUE			(0x28)
> +
> +#define HISI_TEMP_BASE			(-60)
> +#define HISI_TEMP_RESET			(100000)
> +#define HISI_TEMP_PASSIVE		(85000)
> +
> +#define HISI_MAX_SENSORS		4
> +
> +struct hisi_thermal_sensor {
> +	struct hisi_thermal_data *thermal;
> +	struct thermal_zone_device *tzd;
> +	const struct thermal_trip *trip;
> +
> +	uint32_t id;
> +	uint32_t thres_temp, reset_temp;
> +};
> +
> +struct hisi_thermal_data {
> +	struct platform_device *pdev;
> +	struct clk *clk;
> +
> +	int irq, irq_bind_sensor;
> +	bool irq_enabled;
> +
> +	unsigned int sensors_num;
> +	long sensor_temp[HISI_MAX_SENSORS];
> +	struct hisi_thermal_sensor sensors[HISI_MAX_SENSORS];
> +
> +	void __iomem *regs;
> +};
> +
> +static DEFINE_SPINLOCK(thermal_lock);
> +

    "thermal_lock" should be defined in "hisi_thermal_data" to support 
multi device instance.

> +/* in millicelsius */
> +static inline int _step_to_temp(int step)
> +{
> +	/*
> +	 * Every step equals (1 * 200) / 255 celsius, and finally
> +	 * need convert to millicelsius.
> +	 */
> +	return (HISI_TEMP_BASE + (step * 200 / 255)) * 1000;
> +}
> +
> +static inline int _temp_to_step(int temp)
> +{
> +	return ((temp / 1000 - HISI_TEMP_BASE) * 255 / 200);
> +}
> +
> +static long hisi_thermal_get_sensor_temp(struct hisi_thermal_data *data,
> +					 struct hisi_thermal_sensor *sensor)
> +{
> +	unsigned long flags;
> +	int val;
> +
> +	spin_lock_irqsave(&thermal_lock, flags);
> +
> +	/* disable module firstly */
> +	writel(0x0, data->regs + TEMP0_EN);
> +
> +	/* select sensor id */
> +	writel((sensor->id << 12), data->regs + TEMP0_CFG);
> +
> +	/* enable module */
> +	writel(0x1, data->regs + TEMP0_EN);
> +
> +	mdelay(5);
> +
> +	val = readl(data->regs + TEMP0_VALUE);
> +	val = _step_to_temp(val);
> +
> +	/* adjust for negative value */
> +	val = (val < 0) ? 0 : val;
> +
> +	spin_unlock_irqrestore(&thermal_lock, flags);
> +
> +	return val;
> +}
> +
> +static void hisi_thermal_bind_irq(struct hisi_thermal_data *data)
> +{
> +	struct hisi_thermal_sensor *sensor;
> +	unsigned long flags;
> +
> +	sensor = &data->sensors[data->irq_bind_sensor];
> +
> +	spin_lock_irqsave(&thermal_lock, flags);
> +
> +	/* setting the hdak time */
> +	writel(0x0, data->regs + TEMP0_CFG);
> +
> +	/* disable module firstly */
> +	writel(0x0, data->regs + TEMP0_RST_MSK);
> +	writel(0x0, data->regs + TEMP0_EN);
> +
> +	/* select sensor id */
> +	writel((sensor->id << 12), data->regs + TEMP0_CFG);
> +
> +	/* enable for interrupt */
> +	writel(_temp_to_step(sensor->thres_temp)
> +			| 0x0FFFFFF00, data->regs + TEMP0_TH);
> +
> +	writel(_temp_to_step(HISI_TEMP_RESET), data->regs + TEMP0_RST_TH);
> +
> +	/* enable module */
> +	writel(0x1, data->regs + TEMP0_RST_MSK);
> +	writel(0x1, data->regs + TEMP0_EN);
> +
> +	writel(0x0, data->regs + TEMP0_INT_CLR);
> +	writel(0x1, data->regs + TEMP0_INT_EN);
> +
> +	mdelay(5);
> +
> +	spin_unlock_irqrestore(&thermal_lock, flags);
> +
> +}
> +
> +static void hisi_thermal_enable_sensor(struct hisi_thermal_data *data)
> +{
> +	struct hisi_thermal_sensor *sensor;
> +	unsigned long flags;
> +
> +	sensor = &data->sensors[data->irq_bind_sensor];
> +
> +	spin_lock_irqsave(&thermal_lock, flags);
> +
> +	/* setting the hdak time */
> +	writel(0x0, data->regs + TEMP0_CFG);
> +
> +	/* disable module firstly */
> +	writel(0x0, data->regs + TEMP0_RST_MSK);
> +	writel(0x0, data->regs + TEMP0_EN);
> +
> +	/* select sensor id */
> +	writel((sensor->id << 12), data->regs + TEMP0_CFG);
> +
> +	/* enable for interrupt */
> +	writel(_temp_to_step(sensor->thres_temp)
> +			| 0x0FFFFFF00, data->regs + TEMP0_TH);
> +
> +	writel(_temp_to_step(HISI_TEMP_RESET), data->regs + TEMP0_RST_TH);
> +
> +	/* enable module */
> +	writel(0x1, data->regs + TEMP0_RST_MSK);
> +	writel(0x1, data->regs + TEMP0_EN);
> +
> +	writel(0x0, data->regs + TEMP0_INT_CLR);
> +	writel(0x1, data->regs + TEMP0_INT_EN);
> +
> +	mdelay(5);
> +
> +	spin_unlock_irqrestore(&thermal_lock, flags);
> +
> +}
> +
> +static void hisi_thermal_disable_sensor(struct hisi_thermal_data *data)
> +{
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&thermal_lock, flags);
> +
> +	/* disable sensor module */
> +	writel(0x0, data->regs + TEMP0_INT_EN);
> +	writel(0x0, data->regs + TEMP0_RST_MSK);
> +	writel(0x0, data->regs + TEMP0_EN);
> +
> +	spin_unlock_irqrestore(&thermal_lock, flags);
> +
> +}
> +
> +static int hisi_thermal_get_temp(void *_sensor, long *temp)
> +{
> +	struct hisi_thermal_sensor *sensor = _sensor;
> +	struct hisi_thermal_data *data = sensor->thermal;
> +
> +	int sensor_id = 0, i;
> +	long max_temp = 0;
> +
> +	*temp = hisi_thermal_get_sensor_temp(data, sensor);
> +
> +	data->sensor_temp[sensor->id] = *temp;
> +
> +	for (i = 0; i < HISI_MAX_SENSORS; i++) {
> +		if (data->sensor_temp[i] >= max_temp) {
> +			max_temp = data->sensor_temp[i];
> +			sensor_id = i;
> +		}
> +	}
> +
> +	data->irq_bind_sensor = sensor_id;
> +
> +	dev_dbg(&data->pdev->dev, "id=%d, irq=%d, temp=%ld, thres=%d\n",
> +		sensor->id, data->irq_enabled, *temp, sensor->thres_temp);
> +
> +	/*
> +	 * Bind irq to sensor for two cases:
> +	 *   Reenable alarm IRQ if temperature below threshold;
> +	 *   if irq has been enabled, always set it;
> +	 */
> +	if (!data->irq_enabled && max_temp < sensor->thres_temp) {
> +		data->irq_enabled = true;
> +		hisi_thermal_bind_irq(data);
> +	} else if (data->irq_enabled)
> +		hisi_thermal_bind_irq(data);
> +
> +	return 0;
> +}
> +
> +static struct thermal_zone_of_device_ops hisi_of_thermal_ops = {
> +	.get_temp = hisi_thermal_get_temp,
> +};
> +
> +static irqreturn_t hisi_thermal_alarm_irq(int irq, void *dev)
> +{
> +	struct hisi_thermal_data *data = dev;
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&thermal_lock, flags);
> +
> +	/* disable interrupt */
> +	writel(0x0, data->regs + TEMP0_INT_EN);
> +	writel(0x1, data->regs + TEMP0_INT_CLR);
> +
> +	spin_unlock_irqrestore(&thermal_lock, flags);
> +	data->irq_enabled = false;
> +
> +	return IRQ_WAKE_THREAD;
> +}
> +
> +static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev)
> +{
> +	struct hisi_thermal_data *data = dev;
> +	struct hisi_thermal_sensor *sensor;
> +	int i;
> +
> +	sensor = &data->sensors[data->irq_bind_sensor];
> +
> +	dev_crit(&data->pdev->dev, "THERMAL ALARM: T > %d\n",
> +		 sensor->thres_temp / 1000);
> +
> +	for (i = 0; i < data->sensors_num; i++)
> +		thermal_zone_device_update(data->sensors[i].tzd);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int hisi_thermal_init_sensor(struct platform_device *pdev,
> +					struct device_node *np,
> +					struct hisi_thermal_data *data,
> +					int index)
> +{
> +	struct hisi_thermal_sensor *sensor;
> +	int ret, i;
> +
> +	sensor = &data->sensors[index];
> +
> +	ret = of_property_read_u32(np, "hisilicon,tsensor-id",
> +					&sensor->id);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to get id %d: %d\n", index, ret);
> +		return ret;
> +	}
> +
> +	sensor->thermal = data;
> +	sensor->tzd = thermal_zone_of_sensor_register(&pdev->dev, sensor->id,
> +				sensor, &hisi_of_thermal_ops);
> +	if (IS_ERR(sensor->tzd)) {
> +		ret = PTR_ERR(sensor->tzd);
> +		dev_err(&pdev->dev, "failed to register sensor id %d: %d\n",
> +			sensor->id, ret);
> +		return ret;
> +	}
> +
> +	sensor->trip = of_thermal_get_trip_points(sensor->tzd);
> +
> +	for (i = 0; i < of_thermal_get_ntrips(sensor->tzd); i++) {
> +		if (sensor->trip[i].type == THERMAL_TRIP_PASSIVE) {
> +			sensor->thres_temp = sensor->trip[i].temperature;
> +			break;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static int hisi_thermal_get_sensor_data(struct platform_device *pdev)
> +{
> +	struct hisi_thermal_data *data = platform_get_drvdata(pdev);
> +	struct device_node *np = pdev->dev.of_node;
> +	struct device_node *child_np;
> +	int ret, i, index;
> +
> +	/* sensor initialization */
> +	index = 0;
> +	for_each_child_of_node(np, child_np) {
> +
> +		if (index >= HISI_MAX_SENSORS) {
> +			dev_err(&pdev->dev, "unsupported sensor number\n");
> +			ret = -EINVAL;
> +			goto err_init_sensors;
> +		}
> +
> +		ret = hisi_thermal_init_sensor(pdev, child_np, data, index);
> +		if (ret)
> +			goto err_init_sensors;
> +
> +		index++;
> +	}
> +
> +	data->sensors_num = index;
> +	return 0;
> +
> +err_init_sensors:
> +	for (i = 0; i < index; i++)
> +		thermal_zone_of_sensor_unregister(&pdev->dev,
> +				data->sensors[i].tzd);
> +	return ret;
> +}
> +
> +static const struct of_device_id of_hisi_thermal_match[] = {
> +	{ .compatible = "hisilicon,tsensor" },
> +	{ /* end */ }
> +};
> +MODULE_DEVICE_TABLE(of, of_hisi_thermal_match);
> +
> +static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor,
> +				       bool on)
> +{
> +	struct thermal_zone_device *tzd = sensor->tzd;
> +
> +	tzd->ops->set_mode(tzd,
> +		on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED);
> +}
> +
> +static int hisi_thermal_probe(struct platform_device *pdev)
> +{
> +	struct hisi_thermal_data *data;
> +	struct resource *res;
> +	int i;
> +	int ret;
> +
> +	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
> +	if (!data)
> +		return -ENOMEM;
> +
> +	data->pdev = pdev;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	data->regs = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(data->regs)) {
> +		dev_err(&pdev->dev, "failed to get io address\n");
> +		return PTR_ERR(data->regs);
> +	}
> +
> +	data->irq = platform_get_irq(pdev, 0);
> +	if (data->irq < 0)
> +		return data->irq;
> +
> +	ret = devm_request_threaded_irq(&pdev->dev, data->irq,
> +			hisi_thermal_alarm_irq, hisi_thermal_alarm_irq_thread,
> +			0, "hisi_thermal", data);
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
> +		return ret;
> +	}
> +
> +	platform_set_drvdata(pdev, data);
> +
> +	data->clk = devm_clk_get(&pdev->dev, "thermal_clk");
> +	if (IS_ERR(data->clk)) {
> +		ret = PTR_ERR(data->clk);
> +		if (ret != -EPROBE_DEFER)
> +			dev_err(&pdev->dev,
> +				"failed to get thermal clk: %d\n", ret);
> +		return ret;
> +	}
> +
> +	/* enable clock for thermal */
> +	ret = clk_prepare_enable(data->clk);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = hisi_thermal_get_sensor_data(pdev);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to get sensor data\n");
> +		goto err_get_sensor_data;
> +		return ret;
> +	}
> +
> +	hisi_thermal_enable_sensor(data);
> +	data->irq_enabled = true;
> +
> +	for (i = 0; i < data->sensors_num; i++)
> +		hisi_thermal_toggle_sensor(&data->sensors[i], true);
> +
> +	return 0;
> +
> +err_get_sensor_data:
> +	clk_disable_unprepare(data->clk);
> +	return ret;
> +}
> +
> +static int hisi_thermal_remove(struct platform_device *pdev)
> +{
> +	struct hisi_thermal_data *data = platform_get_drvdata(pdev);
> +	int i;
> +
> +	for (i = 0; i < data->sensors_num; i++) {
> +		struct hisi_thermal_sensor *sensor = &data->sensors[i];
> +
> +		hisi_thermal_toggle_sensor(sensor, false);
> +		thermal_zone_of_sensor_unregister(&pdev->dev, sensor->tzd);
> +	}
> +
> +	hisi_thermal_disable_sensor(data);
> +	clk_disable_unprepare(data->clk);
> +	return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int hisi_thermal_suspend(struct device *dev)
> +{
> +	struct hisi_thermal_data *data = dev_get_drvdata(dev);
> +
> +	hisi_thermal_disable_sensor(data);
> +	data->irq_enabled = false;
> +
> +	clk_disable_unprepare(data->clk);
> +
> +	return 0;
> +}
> +
> +static int hisi_thermal_resume(struct device *dev)
> +{
> +	struct hisi_thermal_data *data = dev_get_drvdata(dev);
> +
> +	clk_prepare_enable(data->clk);
> +
> +	data->irq_enabled = true;
> +	hisi_thermal_enable_sensor(data);
> +
> +	return 0;
> +}
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(hisi_thermal_pm_ops,
> +			 hisi_thermal_suspend, hisi_thermal_resume);
> +
> +static struct platform_driver hisi_thermal_driver = {
> +	.driver = {
> +		.name	= "hisi_thermal",
> +		.owner  = THIS_MODULE,
> +		.pm	= &hisi_thermal_pm_ops,
> +		.of_match_table = of_hisi_thermal_match,
> +	},
> +	.probe		= hisi_thermal_probe,
> +	.remove		= hisi_thermal_remove,
> +};
> +
> +static int __init hisi_thermal_init(void)
> +{
> +	return platform_driver_register(&hisi_thermal_driver);
> +}
> +
> +static void __exit hisi_thermal_exit(void)
> +{
> +	platform_driver_unregister(&hisi_thermal_driver);
> +}
> +
> +late_initcall(hisi_thermal_init);
> +module_exit(hisi_thermal_exit);
> +
> +MODULE_AUTHOR("Xinwei Kong <kong.kongxinwei@...ilicon.com>");
> +MODULE_AUTHOR("Leo Yan <leo.yan@...aro.org>");
> +MODULE_DESCRIPTION("Hisilicon thermal driver");
> +MODULE_LICENSE("GPL v2");
>


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