- 根目录:
- drivers
- thermal
- hisi_thermal.c
/*
* 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");