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Date: Thu, 22 Jun 2017 11:42:02 +0800
From: Tao Wang <kevin.wangtao@...ilicon.com>
To: <rui.zhang@...el.com>, <edubezval@...il.com>, <robh+dt@...nel.org>,
<mark.rutland@....com>, <xuwei5@...ilicon.com>,
<catalin.marinas@....com>, <will.deacon@....com>
CC: <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<sunzhaosheng@...ilicon.com>, <leo.yan@...aro.org>,
Tao Wang <kevin.wangtao@...ilicon.com>
Subject: [Patch v2 2/3] thermal: hisilicon: add thermal sensor driver for Hi3660
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@...ilicon.com>
Signed-off-by: Leo Yan <leo.yan@...aro.org>
---
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@...ilicon.com>
+ * Author: 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 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@...ilicon.com>");
+MODULE_AUTHOR("Leo Yan <leo.yan@...aro.org>");
+MODULE_DESCRIPTION("hi3660 thermal driver");
+MODULE_LICENSE("GPL v2");
--
1.7.9.5
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