[PATCH v4 2/3] thermal: hisilicon: add thermal sensor driver for Hi3660
Tao Wang
kevin.wangtao at hisilicon.com
Tue Aug 29 01:17:45 PDT 2017
From: Tao Wang <kevin.wangtao at linaro.org>
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 at linaro.org>
Signed-off-by: Leo Yan <leo.yan at linaro.org>
---
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 at linaro.org>
+ * Author: Leo Yan <leo.yan at linaro.org>
+ *
+ * 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 at linaro.org>");
+MODULE_AUTHOR("Leo Yan <leo.yan at linaro.org>");
+MODULE_DESCRIPTION("hisi tsensor driver");
+MODULE_LICENSE("GPL v2");
--
2.8.1
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