Subject: 答复: [PATCH v3 2/2] thermal: hisilicon: add new hisilicon thermal sensor driver

From: [email-masked] (Xinwei Kong)
Date: Wed, 22 Apr 2015 13:47:40 +0800

On 2015/4/21 17:09, Wangfei (William, Euler) wrote:
> ???: linuxarm-bounces at huawei.com [linuxarm-bounces at huawei.com] ?? Xinwei Kong [kong.kongxinwei at hisilicon.com]
> ????: 2015?4?7? 18:40
> ???: rui.zhuang at intel.com; edubezval at gmail.com; mporter at konsulko.com; jorge.ramirez-ortiz at linaro.org; haojian.zhuang at linaro.org; linux-pm at vger.kernel.org
> ??: devicetree at vger.kernel.org; linux-kernel at vger.kernel.org; Linuxarm; Liguozhu (Kenneth); linux-arm-kernel at lists.infradead.org
> ??: [PATCH v3 2/2] thermal: hisilicon: add new hisilicon thermal sensor driver
> 
> From: kongxinwei <[email-masked]>
> 
> 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 <[email-masked]>
> Signed-off-by: kongxinwei <[email-masked]>
> ---
>  drivers/thermal/Kconfig        |   8 +
>  drivers/thermal/Makefile       |   1 +
>  drivers/thermal/hisi_thermal.c | 438 +++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 447 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..50ffb45
> --- /dev/null
> +++ b/drivers/thermal/hisi_thermal.c
> @@ -0,0 +1,438 @@
> +/*
> + * Hisilicon thermal sensor driver
> + *
> + * Copyright (c) 2014-2015 Hisilicon Limited.
> + * Copyright (c) 2014-2015 Linaro Limited.
> + *
> + * Xinwei Kong <[email-masked]>
> + * Leo Yan <[email-masked]>
> + *
> + * 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)
> 
> Don't use it in this drver

Good comment!!
> 
> +
> +#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;
> +       uint32_t reset_temp;
> +};
> +
> +struct hisi_thermal_data {
> +       struct mutex thermal_lock;
> +       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;
> +};
> +
> +/* 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)
> +{
> +       int val;
> +
> +       mutex_lock(&data->thermal_lock);
> +
> +       /* disable interrupt */
> +       writel(0x0, data->regs + TEMP0_INT_EN);
> +       writel(0x1, data->regs + TEMP0_INT_CLR);
> +
> +       /* 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);
> +
> +       msleep(5);
> 
> usleep_range() replace of msleep(), You can see it: (/Documentation/timers/timers-howto.txt)
> 
I will study it and use it, Thanks!!

> +
> +       val = readl(data->regs + TEMP0_VALUE);
> +       val = _step_to_temp(val);
> +
> +       /* adjust for negative value */
> +       val = (val < 0) ? 0 : val;
> +
> +       mutex_unlock(&data->thermal_lock);
> +
> +       return val;
> +}
> +
> +static void hisi_thermal_bind_irq(struct hisi_thermal_data *data)
> +{
> +       struct hisi_thermal_sensor *sensor;
> +
> +       sensor = &data->sensors[data->irq_bind_sensor];
> +
> +       mutex_lock(&data->thermal_lock);
> +
> +       /* 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);
> +       msleep(5);
> +
> +       mutex_unlock(&data->thermal_lock);
> +
> +}
> +
> +static void hisi_thermal_enable_sensor(struct hisi_thermal_data *data)
> +{
> +       hisi_thermal_bind_irq(data);
> +}
> +
> +static void hisi_thermal_disable_sensor(struct hisi_thermal_data *data)
> +{
> +
> +       mutex_lock(&data->thermal_lock);
> +
> +       /* disable sensor module */
> +       writel(0x0, data->regs + TEMP0_INT_EN);
> +       writel(0x0, data->regs + TEMP0_RST_MSK);
> +       writel(0x0, data->regs + TEMP0_EN);
> +
> +       mutex_unlock(&data->thermal_lock);
> +
> +}
> +
> +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);
> +               enable_irq(data->irq);
> +       } 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;
> +
> +       disable_irq_nosync(irq);
> +       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_register_sensor(struct platform_device *pdev,
> +                                       struct hisi_thermal_data *data,
> +                                       struct hisi_thermal_sensor *sensor,
> +                                       int index)
> +{
> +       int ret, i;
> +
> +       sensor->id = index;
> +       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 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;
> +
> +       mutex_init(&data->thermal_lock);
> +       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;
> +       }
> +
> +       for (i = 0; i < HISI_MAX_SENSORS; ++i) {
> +               ret = hisi_thermal_register_sensor(pdev, data,
> +                                       &data->sensors[i], i);
> +               if (ret) {
> +                       dev_err(&pdev->dev,
> +                       "failed to register thermal sensor: %d\n", ret);
> +                       goto err_get_sensor_data;
> +                       return ret;
> Don't follow return, delete it.
> 
> Feiwang

OK!!

> +               }
> +       }
> +
> +       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,
> +};
> +
> +module_platform_driver(hisi_thermal_driver);
> +
> +MODULE_AUTHOR("Xinwei Kong <[email-masked]>");
> +MODULE_AUTHOR("Leo Yan <[email-masked]>");
> +MODULE_DESCRIPTION("Hisilicon thermal driver");
> +MODULE_LICENSE("GPL v2");
> --
> 1.9.1
> 
> 
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