--- /dev/null
+/*
+ * Hisilicon thermal sensor driver
+ *
+ * Copyright (c) 2014-2015 Hisilicon Limited.
+ * Copyright (c) 2014-2015 Linaro Limited.
+ *
+ * Xinwei Kong <kong.kongxinwei@hisilicon.com>
+ * Leo Yan <leo.yan@linaro.org>
+ *
+ * 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/cpufreq.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+
+#include "thermal_core.h"
+
+#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_VALUE (0x28)
+
+#define HISI_TEMP_BASE (-60)
+#define HISI_TEMP_RESET (100000)
+
+#define HISI_MAX_SENSORS 4
+
+struct hisi_thermal_sensor {
+ struct hisi_thermal_data *thermal;
+ struct thermal_zone_device *tzd;
+
+ long sensor_temp;
+ uint32_t id;
+ uint32_t thres_temp;
+};
+
+struct hisi_thermal_data {
+ struct mutex thermal_lock; /* protects register data */
+ struct platform_device *pdev;
+ struct clk *clk;
+ struct hisi_thermal_sensor sensors[HISI_MAX_SENSORS];
+
+ int irq, irq_bind_sensor;
+ bool irq_enabled;
+
+ 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 long _temp_to_step(long 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)
+{
+ long 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);
+
+ usleep_range(3000, 5000);
+
+ val = readl(data->regs + TEMP0_VALUE);
+ val = _step_to_temp(val);
+
+ mutex_unlock(&data->thermal_lock);
+
+ return val;
+}
+
+static void hisi_thermal_enable_bind_irq_sensor
+ (struct hisi_thermal_data *data)
+{
+ struct hisi_thermal_sensor *sensor;
+
+ mutex_lock(&data->thermal_lock);
+
+ sensor = &data->sensors[data->irq_bind_sensor];
+
+ /* 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);
+
+ usleep_range(3000, 5000);
+
+ mutex_unlock(&data->thermal_lock);
+}
+
+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, int *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);
+
+ sensor->sensor_temp = *temp;
+
+ for (i = 0; i < HISI_MAX_SENSORS; i++) {
+ if (data->sensors[i].sensor_temp >= max_temp) {
+ max_temp = data->sensors[i].sensor_temp;
+ sensor_id = i;
+ }
+ }
+
+ mutex_lock(&data->thermal_lock);
+ data->irq_bind_sensor = sensor_id;
+ mutex_unlock(&data->thermal_lock);
+
+ dev_dbg(&data->pdev->dev, "id=%d, irq=%d, temp=%d, 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) {
+ hisi_thermal_enable_bind_irq_sensor(data);
+ return 0;
+ }
+
+ if (max_temp < sensor->thres_temp) {
+ data->irq_enabled = true;
+ hisi_thermal_enable_bind_irq_sensor(data);
+ enable_irq(data->irq);
+ }
+
+ 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;
+
+ mutex_lock(&data->thermal_lock);
+ sensor = &data->sensors[data->irq_bind_sensor];
+
+ dev_crit(&data->pdev->dev, "THERMAL ALARM: T > %d\n",
+ sensor->thres_temp / 1000);
+ mutex_unlock(&data->thermal_lock);
+
+ for (i = 0; i < HISI_MAX_SENSORS; 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;
+ const struct thermal_trip *trip;
+
+ 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;
+ }
+
+ trip = of_thermal_get_trip_points(sensor->tzd);
+
+ for (i = 0; i < of_thermal_get_ntrips(sensor->tzd); i++) {
+ if (trip[i].type == THERMAL_TRIP_PASSIVE) {
+ sensor->thres_temp = 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;
+ }
+ }
+
+ hisi_thermal_enable_bind_irq_sensor(data);
+ data->irq_enabled = true;
+
+ for (i = 0; i < HISI_MAX_SENSORS; 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 < HISI_MAX_SENSORS; 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_bind_irq_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",
+ .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 <kong.kongxinwei@hisilicon.com>");
+MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>");
+MODULE_DESCRIPTION("Hisilicon thermal driver");
+MODULE_LICENSE("GPL v2");
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