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OpenCloudOS-Kernel/drivers/thermal/hisi_thermal.c

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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 <linux/of_device.h>
#include "thermal_core.h"
#define HI6220_TEMP0_LAG (0x0)
#define HI6220_TEMP0_TH (0x4)
#define HI6220_TEMP0_RST_TH (0x8)
#define HI6220_TEMP0_CFG (0xC)
#define HI6220_TEMP0_CFG_SS_MSK (0xF000)
#define HI6220_TEMP0_CFG_HDAK_MSK (0x30)
#define HI6220_TEMP0_EN (0x10)
#define HI6220_TEMP0_INT_EN (0x14)
#define HI6220_TEMP0_INT_CLR (0x18)
#define HI6220_TEMP0_RST_MSK (0x1C)
#define HI6220_TEMP0_VALUE (0x28)
#define HI3660_OFFSET(chan) ((chan) * 0x40)
#define HI3660_TEMP(chan) (HI3660_OFFSET(chan) + 0x1C)
#define HI3660_TH(chan) (HI3660_OFFSET(chan) + 0x20)
#define HI3660_LAG(chan) (HI3660_OFFSET(chan) + 0x28)
#define HI3660_INT_EN(chan) (HI3660_OFFSET(chan) + 0x2C)
#define HI3660_INT_CLR(chan) (HI3660_OFFSET(chan) + 0x30)
#define HI6220_TEMP_BASE (-60000)
#define HI6220_TEMP_RESET (100000)
#define HI6220_TEMP_STEP (785)
#define HI6220_TEMP_LAG (3500)
#define HI3660_TEMP_BASE (-63780)
#define HI3660_TEMP_STEP (205)
#define HI3660_TEMP_LAG (4000)
#define HI6220_DEFAULT_SENSOR 2
#define HI3660_DEFAULT_SENSOR 1
struct hisi_thermal_sensor {
struct thermal_zone_device *tzd;
uint32_t id;
uint32_t thres_temp;
};
struct hisi_thermal_data {
int (*get_temp)(struct hisi_thermal_data *data);
int (*enable_sensor)(struct hisi_thermal_data *data);
int (*disable_sensor)(struct hisi_thermal_data *data);
int (*irq_handler)(struct hisi_thermal_data *data);
struct platform_device *pdev;
struct clk *clk;
struct hisi_thermal_sensor sensor;
void __iomem *regs;
int irq;
};
/*
* The temperature computation on the tsensor is as follow:
* Unit: millidegree Celsius
* Step: 200/255 (0.7843)
* Temperature base: -60°C
*
* The register is programmed in temperature steps, every step is 785
* millidegree and begins at -60 000 m°C
*
* The temperature from the steps:
*
* Temp = TempBase + (steps x 785)
*
* and the steps from the temperature:
*
* steps = (Temp - TempBase) / 785
*
*/
static inline int hi6220_thermal_step_to_temp(int step)
{
return HI6220_TEMP_BASE + (step * HI6220_TEMP_STEP);
}
static inline int hi6220_thermal_temp_to_step(int temp)
{
return DIV_ROUND_UP(temp - HI6220_TEMP_BASE, HI6220_TEMP_STEP);
}
/*
* for Hi3660,
* Step: 189/922 (0.205)
* Temperature base: -63.780°C
*
* The register is programmed in temperature steps, every step is 205
* millidegree and begins at -63 780 m°C
*/
static inline int hi3660_thermal_step_to_temp(int step)
{
return HI3660_TEMP_BASE + step * HI3660_TEMP_STEP;
}
static inline int hi3660_thermal_temp_to_step(int temp)
{
return DIV_ROUND_UP(temp - HI3660_TEMP_BASE, HI3660_TEMP_STEP);
}
/*
* The lag register contains 5 bits encoding the temperature in steps.
*
* Each time the temperature crosses the threshold boundary, an
* interrupt is raised. It could be when the temperature is going
* above the threshold or below. However, if the temperature is
* fluctuating around this value due to the load, we can receive
* several interrupts which may not desired.
*
* We can setup a temperature representing the delta between the
* threshold and the current temperature when the temperature is
* decreasing.
*
* For instance: the lag register is 5°C, the threshold is 65°C, when
* the temperature reaches 65°C an interrupt is raised and when the
* temperature decrease to 65°C - 5°C another interrupt is raised.
*
* A very short lag can lead to an interrupt storm, a long lag
* increase the latency to react to the temperature changes. In our
* case, that is not really a problem as we are polling the
* temperature.
*
* [0:4] : lag register
*
* The temperature is coded in steps, cf. HI6220_TEMP_STEP.
*
* Min : 0x00 : 0.0 °C
* Max : 0x1F : 24.3 °C
*
* The 'value' parameter is in milliCelsius.
*/
static inline void hi6220_thermal_set_lag(void __iomem *addr, int value)
{
writel(DIV_ROUND_UP(value, HI6220_TEMP_STEP) & 0x1F,
addr + HI6220_TEMP0_LAG);
}
static inline void hi6220_thermal_alarm_clear(void __iomem *addr, int value)
{
writel(value, addr + HI6220_TEMP0_INT_CLR);
}
static inline void hi6220_thermal_alarm_enable(void __iomem *addr, int value)
{
writel(value, addr + HI6220_TEMP0_INT_EN);
}
static inline void hi6220_thermal_alarm_set(void __iomem *addr, int temp)
{
writel(hi6220_thermal_temp_to_step(temp) | 0x0FFFFFF00,
addr + HI6220_TEMP0_TH);
}
static inline void hi6220_thermal_reset_set(void __iomem *addr, int temp)
{
writel(hi6220_thermal_temp_to_step(temp), addr + HI6220_TEMP0_RST_TH);
}
static inline void hi6220_thermal_reset_enable(void __iomem *addr, int value)
{
writel(value, addr + HI6220_TEMP0_RST_MSK);
}
static inline void hi6220_thermal_enable(void __iomem *addr, int value)
{
writel(value, addr + HI6220_TEMP0_EN);
}
static inline int hi6220_thermal_get_temperature(void __iomem *addr)
{
return hi6220_thermal_step_to_temp(readl(addr + HI6220_TEMP0_VALUE));
}
/*
* [0:6] lag register
*
* The temperature is coded in steps, cf. HI3660_TEMP_STEP.
*
* Min : 0x00 : 0.0 °C
* Max : 0x7F : 26.0 °C
*
*/
static inline void hi3660_thermal_set_lag(void __iomem *addr,
int id, int value)
{
writel(DIV_ROUND_UP(value, HI3660_TEMP_STEP) & 0x7F,
addr + HI3660_LAG(id));
}
static inline void hi3660_thermal_alarm_clear(void __iomem *addr,
int id, int value)
{
writel(value, addr + HI3660_INT_CLR(id));
}
static inline void hi3660_thermal_alarm_enable(void __iomem *addr,
int id, int value)
{
writel(value, addr + HI3660_INT_EN(id));
}
static inline void hi3660_thermal_alarm_set(void __iomem *addr,
int id, int value)
{
writel(value, addr + HI3660_TH(id));
}
static inline int hi3660_thermal_get_temperature(void __iomem *addr, int id)
{
return hi3660_thermal_step_to_temp(readl(addr + HI3660_TEMP(id)));
}
/*
* Temperature configuration register - Sensor selection
*
* Bits [19:12]
*
* 0x0: local sensor (default)
* 0x1: remote sensor 1 (ACPU cluster 1)
* 0x2: remote sensor 2 (ACPU cluster 0)
* 0x3: remote sensor 3 (G3D)
*/
static inline void hi6220_thermal_sensor_select(void __iomem *addr, int sensor)
{
writel((readl(addr + HI6220_TEMP0_CFG) & ~HI6220_TEMP0_CFG_SS_MSK) |
(sensor << 12), addr + HI6220_TEMP0_CFG);
}
/*
* Temperature configuration register - Hdak conversion polling interval
*
* Bits [5:4]
*
* 0x0 : 0.768 ms
* 0x1 : 6.144 ms
* 0x2 : 49.152 ms
* 0x3 : 393.216 ms
*/
static inline void hi6220_thermal_hdak_set(void __iomem *addr, int value)
{
writel((readl(addr + HI6220_TEMP0_CFG) & ~HI6220_TEMP0_CFG_HDAK_MSK) |
(value << 4), addr + HI6220_TEMP0_CFG);
}
static int hi6220_thermal_irq_handler(struct hisi_thermal_data *data)
{
hi6220_thermal_alarm_clear(data->regs, 1);
return 0;
}
static int hi3660_thermal_irq_handler(struct hisi_thermal_data *data)
{
hi3660_thermal_alarm_clear(data->regs, data->sensor.id, 1);
return 0;
}
static int hi6220_thermal_get_temp(struct hisi_thermal_data *data)
{
return hi6220_thermal_get_temperature(data->regs);
}
static int hi3660_thermal_get_temp(struct hisi_thermal_data *data)
{
return hi3660_thermal_get_temperature(data->regs, data->sensor.id);
}
static int hi6220_thermal_disable_sensor(struct hisi_thermal_data *data)
{
/* disable sensor module */
hi6220_thermal_enable(data->regs, 0);
hi6220_thermal_alarm_enable(data->regs, 0);
hi6220_thermal_reset_enable(data->regs, 0);
clk_disable_unprepare(data->clk);
return 0;
}
static int hi3660_thermal_disable_sensor(struct hisi_thermal_data *data)
{
/* disable sensor module */
hi3660_thermal_alarm_enable(data->regs, data->sensor.id, 0);
return 0;
}
static int hi6220_thermal_enable_sensor(struct hisi_thermal_data *data)
{
struct hisi_thermal_sensor *sensor = &data->sensor;
int ret;
/* enable clock for tsensor */
ret = clk_prepare_enable(data->clk);
if (ret)
return ret;
/* disable module firstly */
hi6220_thermal_reset_enable(data->regs, 0);
hi6220_thermal_enable(data->regs, 0);
/* select sensor id */
hi6220_thermal_sensor_select(data->regs, sensor->id);
/* setting the hdak time */
hi6220_thermal_hdak_set(data->regs, 0);
/* setting lag value between current temp and the threshold */
hi6220_thermal_set_lag(data->regs, HI6220_TEMP_LAG);
/* enable for interrupt */
hi6220_thermal_alarm_set(data->regs, sensor->thres_temp);
hi6220_thermal_reset_set(data->regs, HI6220_TEMP_RESET);
/* enable module */
hi6220_thermal_reset_enable(data->regs, 1);
hi6220_thermal_enable(data->regs, 1);
hi6220_thermal_alarm_clear(data->regs, 0);
hi6220_thermal_alarm_enable(data->regs, 1);
return 0;
}
static int hi3660_thermal_enable_sensor(struct hisi_thermal_data *data)
{
unsigned int value;
struct hisi_thermal_sensor *sensor = &data->sensor;
/* disable interrupt */
hi3660_thermal_alarm_enable(data->regs, sensor->id, 0);
/* setting lag value between current temp and the threshold */
hi3660_thermal_set_lag(data->regs, sensor->id, HI3660_TEMP_LAG);
/* set interrupt threshold */
value = hi3660_thermal_temp_to_step(sensor->thres_temp);
hi3660_thermal_alarm_set(data->regs, sensor->id, value);
/* enable interrupt */
hi3660_thermal_alarm_clear(data->regs, sensor->id, 1);
hi3660_thermal_alarm_enable(data->regs, sensor->id, 1);
return 0;
}
static int hi6220_thermal_probe(struct hisi_thermal_data *data)
{
struct platform_device *pdev = data->pdev;
struct device *dev = &pdev->dev;
struct resource *res;
int ret;
data->get_temp = hi6220_thermal_get_temp;
data->enable_sensor = hi6220_thermal_enable_sensor;
data->disable_sensor = hi6220_thermal_disable_sensor;
data->irq_handler = hi6220_thermal_irq_handler;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
data->regs = devm_ioremap_resource(dev, res);
if (IS_ERR(data->regs)) {
dev_err(dev, "failed to get io address\n");
return PTR_ERR(data->regs);
}
data->clk = devm_clk_get(dev, "thermal_clk");
if (IS_ERR(data->clk)) {
ret = PTR_ERR(data->clk);
if (ret != -EPROBE_DEFER)
dev_err(dev, "failed to get thermal clk: %d\n", ret);
return ret;
}
data->irq = platform_get_irq(pdev, 0);
if (data->irq < 0)
return data->irq;
data->sensor.id = HI6220_DEFAULT_SENSOR;
return 0;
}
static int hi3660_thermal_probe(struct hisi_thermal_data *data)
{
struct platform_device *pdev = data->pdev;
struct device *dev = &pdev->dev;
struct resource *res;
data->get_temp = hi3660_thermal_get_temp;
data->enable_sensor = hi3660_thermal_enable_sensor;
data->disable_sensor = hi3660_thermal_disable_sensor;
data->irq_handler = hi3660_thermal_irq_handler;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
data->regs = devm_ioremap_resource(dev, res);
if (IS_ERR(data->regs)) {
dev_err(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;
data->sensor.id = HI3660_DEFAULT_SENSOR;
return 0;
}
static int hisi_thermal_get_temp(void *__data, int *temp)
{
struct hisi_thermal_data *data = __data;
struct hisi_thermal_sensor *sensor = &data->sensor;
*temp = data->get_temp(data);
dev_dbg(&data->pdev->dev, "id=%d, temp=%d, thres=%d\n",
sensor->id, *temp, sensor->thres_temp);
return 0;
}
static const struct thermal_zone_of_device_ops hisi_of_thermal_ops = {
.get_temp = hisi_thermal_get_temp,
};
static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev)
{
struct hisi_thermal_data *data = dev;
struct hisi_thermal_sensor *sensor = &data->sensor;
int temp = 0;
data->irq_handler(data);
hisi_thermal_get_temp(data, &temp);
if (temp >= sensor->thres_temp) {
dev_crit(&data->pdev->dev, "THERMAL ALARM: %d > %d\n",
temp, sensor->thres_temp);
thermal_zone_device_update(data->sensor.tzd,
THERMAL_EVENT_UNSPECIFIED);
} else {
dev_crit(&data->pdev->dev, "THERMAL ALARM stopped: %d < %d\n",
temp, sensor->thres_temp);
}
return IRQ_HANDLED;
}
static int hisi_thermal_register_sensor(struct platform_device *pdev,
struct hisi_thermal_data *data,
struct hisi_thermal_sensor *sensor)
{
int ret, i;
const struct thermal_trip *trip;
sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
sensor->id, data,
&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",
.data = hi6220_thermal_probe
},
{
.compatible = "hisilicon,hi3660-tsensor",
.data = hi3660_thermal_probe
},
{ /* 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;
int (*platform_probe)(struct hisi_thermal_data *);
struct device *dev = &pdev->dev;
int ret;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->pdev = pdev;
platform_set_drvdata(pdev, data);
platform_probe = of_device_get_match_data(dev);
if (!platform_probe) {
dev_err(dev, "failed to get probe func\n");
return -EINVAL;
}
ret = platform_probe(data);
if (ret)
return ret;
ret = hisi_thermal_register_sensor(pdev, data,
&data->sensor);
if (ret) {
dev_err(dev, "failed to register thermal sensor: %d\n", ret);
return ret;
}
ret = data->enable_sensor(data);
if (ret) {
dev_err(dev, "Failed to setup the sensor: %d\n", ret);
return ret;
}
if (data->irq) {
ret = devm_request_threaded_irq(dev, data->irq, NULL,
hisi_thermal_alarm_irq_thread,
IRQF_ONESHOT, "hisi_thermal", data);
if (ret < 0) {
dev_err(dev, "failed to request alarm irq: %d\n", ret);
return ret;
}
}
hisi_thermal_toggle_sensor(&data->sensor, true);
return 0;
}
static int hisi_thermal_remove(struct platform_device *pdev)
{
struct hisi_thermal_data *data = platform_get_drvdata(pdev);
struct hisi_thermal_sensor *sensor = &data->sensor;
hisi_thermal_toggle_sensor(sensor, false);
data->disable_sensor(data);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int hisi_thermal_suspend(struct device *dev)
{
struct hisi_thermal_data *data = dev_get_drvdata(dev);
data->disable_sensor(data);
return 0;
}
static int hisi_thermal_resume(struct device *dev)
{
struct hisi_thermal_data *data = dev_get_drvdata(dev);
return data->enable_sensor(data);
}
#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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