This patch adds the support for thermal sensor of Hi3660 SoC. this will register sensors for thermal framework and use device tree to bind cooling device. Signed-off-by: Tao Wang <kevin.wangtao@xxxxxxxxxxxxx> Signed-off-by: Leo Yan <leo.yan@xxxxxxxxxx> --- Changes in v2: - correct alphabet order - correct compatible name drivers/thermal/Kconfig | 10 ++ drivers/thermal/Makefile | 1 + drivers/thermal/hi3660_thermal.c | 198 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 209 insertions(+) create mode 100644 drivers/thermal/hi3660_thermal.c diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index b5b5fac..ed22a90 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -192,6 +192,16 @@ config THERMAL_EMULATION because userland can easily disable the thermal policy by simply flooding this sysfs node with low temperature values. +config HI3660_THERMAL + tristate "Hi3660 thermal driver" + depends on ARCH_HISI || COMPILE_TEST + depends on HAS_IOMEM + depends on OF + default y + help + Enable this to plug Hi3660 thermal driver into the Linux thermal + framework. + config HISI_THERMAL tristate "Hisilicon thermal driver" depends on ARCH_HISI || COMPILE_TEST diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index 094d703..f29d0a5 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -55,6 +55,7 @@ obj-$(CONFIG_INTEL_PCH_THERMAL) += intel_pch_thermal.o obj-$(CONFIG_ST_THERMAL) += st/ obj-$(CONFIG_QCOM_TSENS) += qcom/ obj-$(CONFIG_TEGRA_SOCTHERM) += tegra/ +obj-$(CONFIG_HI3660_THERMAL) += hi3660_thermal.o obj-$(CONFIG_HISI_THERMAL) += hisi_thermal.o obj-$(CONFIG_MTK_THERMAL) += mtk_thermal.o obj-$(CONFIG_GENERIC_ADC_THERMAL) += thermal-generic-adc.o diff --git a/drivers/thermal/hi3660_thermal.c b/drivers/thermal/hi3660_thermal.c new file mode 100644 index 0000000..68fa9018 --- /dev/null +++ b/drivers/thermal/hi3660_thermal.c @@ -0,0 +1,198 @@ +/* + * linux/drivers/thermal/hi3660_thermal.c + * + * Copyright (c) 2017 Hisilicon Limited. + * Copyright (c) 2017 Linaro Limited. + * + * Author: Tao Wang <kevin.wangtao@xxxxxxxxxxxxx> + * Author: Leo Yan <leo.yan@xxxxxxxxxx> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/clk.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/of.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/thermal.h> + +#include "thermal_core.h" + +#define HW_MAX_SENSORS 4 +#define HISI_MAX_SENSORS 6 +#define SENSOR_MAX 4 +#define SENSOR_AVG 5 + +#define ADC_MIN 116 +#define ADC_MAX 922 + +/* hi3660 Thermal Sensor Dev Structure */ +struct hi3660_thermal_sensor { + struct hi3660_thermal_data *thermal; + struct thermal_zone_device *tzd; + + uint32_t id; +}; + +struct hi3660_thermal_data { + struct platform_device *pdev; + struct hi3660_thermal_sensor sensors[HISI_MAX_SENSORS]; + void __iomem *thermal_base; +}; + +unsigned int sensor_reg_offset[HW_MAX_SENSORS] = { 0x1c, 0x5c, 0x9c, 0xdc }; + + +static int hi3660_thermal_get_temp(void *_sensor, int *temp) +{ + struct hi3660_thermal_sensor *sensor = _sensor; + struct hi3660_thermal_data *data = sensor->thermal; + unsigned int idx; + int val, average = 0, max = 0; + + if (sensor->id < HW_MAX_SENSORS) { + val = readl(data->thermal_base + sensor_reg_offset[sensor->id]); + val = clamp_val(val, ADC_MIN, ADC_MAX); + } else { + for (idx = 0; idx < HW_MAX_SENSORS; idx++) { + val = readl(data->thermal_base + + sensor_reg_offset[idx]); + val = clamp_val(val, ADC_MIN, ADC_MAX); + average += val; + if (val > max) + max = val; + } + + if (sensor->id == SENSOR_MAX) + val = max; + else if (sensor->id == SENSOR_AVG) + val = average / HW_MAX_SENSORS; + } + + *temp = ((val - ADC_MIN) * 165000) / (ADC_MAX - ADC_MIN) - 40000; + + return 0; +} + +static struct thermal_zone_of_device_ops hi3660_of_thermal_ops = { + .get_temp = hi3660_thermal_get_temp, +}; + +static int hi3660_thermal_register_sensor(struct platform_device *pdev, + struct hi3660_thermal_data *data, + struct hi3660_thermal_sensor *sensor, + int index) +{ + int ret = 0; + + sensor->id = index; + sensor->thermal = data; + + sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev, + sensor->id, sensor, &hi3660_of_thermal_ops); + if (IS_ERR(sensor->tzd)) { + ret = PTR_ERR(sensor->tzd); + sensor->tzd = NULL; + } + + return ret; +} + +static void hi3660_thermal_toggle_sensor(struct hi3660_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 hi3660_thermal_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct hi3660_thermal_data *data; + struct resource *res; + int ret = 0; + int i; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->pdev = pdev; + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + data->thermal_base = devm_ioremap_resource(dev, res); + if (IS_ERR(data->thermal_base)) { + dev_err(dev, "failed get reg base\n"); + return -ENOMEM; + } + + platform_set_drvdata(pdev, data); + + for (i = 0; i < HISI_MAX_SENSORS; ++i) { + ret = hi3660_thermal_register_sensor(pdev, data, + &data->sensors[i], i); + if (ret) + dev_err(&pdev->dev, + "failed to register thermal sensor%d: %d\n", + i, ret); + else + hi3660_thermal_toggle_sensor(&data->sensors[i], true); + } + + dev_info(&pdev->dev, "Thermal Sensor Loaded\n"); + return 0; +} + +static int hi3660_thermal_exit(struct platform_device *pdev) +{ + struct hi3660_thermal_data *data = platform_get_drvdata(pdev); + int i; + + for (i = 0; i < HISI_MAX_SENSORS; i++) { + struct hi3660_thermal_sensor *sensor = &data->sensors[i]; + + if (!sensor->tzd) + continue; + + hi3660_thermal_toggle_sensor(sensor, false); + } + + return 0; +} + +static const struct of_device_id hi3660_thermal_id_table[] = { + { .compatible = "hisilicon,hi3660-thermal" }, + {} +}; +MODULE_DEVICE_TABLE(of, hi3660_thermal_id_table); + +static struct platform_driver hi3660_thermal_driver = { + .probe = hi3660_thermal_probe, + .remove = hi3660_thermal_exit, + .driver = { + .name = "hi3660_thermal", + .of_match_table = hi3660_thermal_id_table, + }, +}; + +module_platform_driver(hi3660_thermal_driver); + +MODULE_AUTHOR("Tao Wang <kevin.wangtao@xxxxxxxxxxxxx>"); +MODULE_AUTHOR("Leo Yan <leo.yan@xxxxxxxxxx>"); +MODULE_DESCRIPTION("hi3660 thermal driver"); +MODULE_LICENSE("GPL v2"); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
