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/*
* 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 * 1000 + (step * 200000 / 255));
}
static inline long _temp_to_step(long temp)
{
return ((temp - HISI_TEMP_BASE * 1000) * 255) / 200000;
}
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 = -1, 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].tzd)
continue;
if (data->sensors[i].sensor_temp >= max_temp) {
max_temp = data->sensors[i].sensor_temp;
sensor_id = i;
}
}
/* If no sensor has been enabled, then skip to enable irq */
if (sensor_id == -1)
return 0;
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++) {
if (!data->sensors[i].tzd)
continue;
thermal_zone_device_update(data->sensors[i].tzd,
THERMAL_EVENT_UNSPECIFIED);
}
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 = devm_thermal_zone_of_sensor_register(&pdev->dev,
sensor->id, sensor, &hisi_of_thermal_ops);
if (IS_ERR(sensor->tzd)) {
ret = PTR_ERR(sensor->tzd);
sensor->tzd = NULL;
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(<
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