From: Tao Wang <kevin.wangtao@xxxxxxxxxx> 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@xxxxxxxxxx> Signed-off-by: Leo Yan <leo.yan@xxxxxxxxxx> --- drivers/thermal/Kconfig | 13 +++ drivers/thermal/Makefile | 1 + drivers/thermal/hisi_tsensor.c | 209 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 223 insertions(+) create mode 100644 drivers/thermal/hisi_tsensor.c diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index b5b5fac..32f582d 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -203,6 +203,19 @@ config HISI_THERMAL thermal framework. cpufreq is used as the cooling device to throttle CPUs when the passive trip is crossed. +config HISI_TSENSOR + tristate "Hisilicon tsensor driver" + depends on ARCH_HISI || COMPILE_TEST + depends on HAS_IOMEM + depends on OF + default y + help + Enable this to plug Hisilicon's tsensor driver into the Linux thermal + framework. Besides all the hardware sensors, this also support two + virtual sensors, one for maximum of all the hardware sensor, and + one for average of all the hardware sensor. + Compitable with Hi3660 or higher. + config IMX_THERMAL tristate "Temperature sensor driver for Freescale i.MX SoCs" depends on (ARCH_MXC && CPU_THERMAL) || COMPILE_TEST diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index 094d703..8a16bd4 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -56,6 +56,7 @@ obj-$(CONFIG_ST_THERMAL) += st/ obj-$(CONFIG_QCOM_TSENS) += qcom/ obj-$(CONFIG_TEGRA_SOCTHERM) += tegra/ obj-$(CONFIG_HISI_THERMAL) += hisi_thermal.o +obj-$(CONFIG_HISI_TSENSOR) += hisi_tsensor.o obj-$(CONFIG_MTK_THERMAL) += mtk_thermal.o obj-$(CONFIG_GENERIC_ADC_THERMAL) += thermal-generic-adc.o obj-$(CONFIG_ZX2967_THERMAL) += zx2967_thermal.o diff --git a/drivers/thermal/hisi_tsensor.c b/drivers/thermal/hisi_tsensor.c new file mode 100644 index 0000000..34cf2ba --- /dev/null +++ b/drivers/thermal/hisi_tsensor.c @@ -0,0 +1,209 @@ +/* + * linux/drivers/thermal/hisi_tsensor.c + * + * Copyright (c) 2017 Hisilicon Limited. + * Copyright (c) 2017 Linaro Limited. + * + * Author: Tao Wang <kevin.wangtao@xxxxxxxxxx> + * 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 VIRTUAL_SENSORS 2 + +/* hisi Thermal Sensor Dev Structure */ +struct hisi_thermal_sensor { + struct hisi_thermal_data *thermal; + struct thermal_zone_device *tzd; + void __iomem *sensor_reg; + unsigned int id; +}; + +struct hisi_thermal_data { + struct platform_device *pdev; + struct hisi_thermal_sensor *sensors; + unsigned int range[2]; + unsigned int coef[2]; + unsigned int max_hw_sensor; +}; + +static int hisi_thermal_get_temp(void *_sensor, int *temp) +{ + struct hisi_thermal_sensor *sensor = _sensor; + struct hisi_thermal_data *data = sensor->thermal; + unsigned int idx, adc_min, adc_max, max_sensor; + int val, average = 0, max = 0; + + adc_min = data->range[0]; + adc_max = data->range[1]; + max_sensor = data->max_hw_sensor; + + if (sensor->id < max_sensor) { + val = readl(sensor->sensor_reg); + val = clamp_val(val, adc_min, adc_max); + } else { + for (idx = 0; idx < max_sensor; idx++) { + val = readl(data->sensors[idx].sensor_reg); + val = clamp_val(val, adc_min, adc_max); + average += val; + if (val > max) + max = val; + } + + if (sensor->id == max_sensor) + val = max; + else + val = average / max_sensor; + } + + *temp = ((val - adc_min) * data->coef[0]) / (adc_max - adc_min) + + data->coef[1]; + + return 0; +} + +static struct thermal_zone_of_device_ops hisi_of_thermal_ops = { + .get_temp = hisi_thermal_get_temp, +}; + +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 device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct hisi_thermal_data *data; + struct hisi_thermal_sensor *sensor; + struct resource *res; + unsigned int max_sensor; + int ret, i; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->pdev = pdev; + ret = of_property_read_u32(np, "hisi,tsensors", &max_sensor); + if (ret < 0) { + dev_err(dev, "failed to get max sensor\n"); + return -EINVAL; + } + data->max_hw_sensor = max_sensor; + + data->sensors = devm_kzalloc(dev, + sizeof(*data->sensors) * (max_sensor + VIRTUAL_SENSORS), + GFP_KERNEL); + if (IS_ERR(data->sensors)) { + dev_err(dev, "failed to alloc sensors\n"); + return -ENOMEM; + } + + ret = of_property_read_u32_array(np, "hisi,coef", data->coef, 2); + if (ret < 0) { + dev_err(dev, "failed to get coef\n"); + return -EINVAL; + } + + ret = of_property_read_u32_array(np, "hisi,adc-range", data->range, 2); + if (ret < 0) { + dev_err(dev, "failed to get range\n"); + return -EINVAL; + } + + platform_set_drvdata(pdev, data); + + for (i = 0; i < max_sensor + VIRTUAL_SENSORS; ++i) { + sensor = &data->sensors[i]; + if (i < max_sensor) { + res = platform_get_resource(pdev, IORESOURCE_MEM, i); + sensor->sensor_reg = devm_ioremap_resource(dev, res); + if (IS_ERR(sensor->sensor_reg)) { + dev_err(dev, "failed to get reg base\n"); + return -ENOMEM; + } + } + + sensor->id = i; + sensor->thermal = data; + sensor->tzd = thermal_zone_of_sensor_register(dev, + i, sensor, &hisi_of_thermal_ops); + if (IS_ERR(sensor->tzd)) { + sensor->tzd = NULL; + } else { + hisi_thermal_toggle_sensor(sensor, true); + dev_info(dev, "thermal sensor%d registered\n", i); + } + } + + return 0; +} + +static int hisi_thermal_exit(struct platform_device *pdev) +{ + struct hisi_thermal_data *data = platform_get_drvdata(pdev); + int i; + + for (i = 0; i < data->max_hw_sensor + VIRTUAL_SENSORS; i++) { + struct hisi_thermal_sensor *sensor = &data->sensors[i]; + + if (!sensor->tzd) + continue; + + hisi_thermal_toggle_sensor(sensor, false); + thermal_zone_of_sensor_unregister(&pdev->dev, sensor->tzd); + } + + return 0; +} + +static const struct of_device_id hisi_thermal_id_table[] = { + { .compatible = "hisilicon,hi3660-tsensor" }, + {} +}; +MODULE_DEVICE_TABLE(of, hisi_thermal_id_table); + +static struct platform_driver hisi_thermal_driver = { + .probe = hisi_thermal_probe, + .remove = hisi_thermal_exit, + .driver = { + .name = "hisi_tsensor", + .of_match_table = hisi_thermal_id_table, + }, +}; + +module_platform_driver(hisi_thermal_driver); + +MODULE_AUTHOR("Tao Wang <kevin.wangtao@xxxxxxxxxx>"); +MODULE_AUTHOR("Leo Yan <leo.yan@xxxxxxxxxx>"); +MODULE_DESCRIPTION("hisi tsensor driver"); +MODULE_LICENSE("GPL v2"); -- 2.8.1 -- 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
