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alistair23-linux/drivers/thermal/hisi_thermal.c
Daniel Lezcano 7d3a2a2bba thermal/drivers/hisi: Fix number of sensors on hi3660 
Without this patch the thermal driver is broken on hi3660.

The dual sensors support patchset was partially merged, unfortunately
the dual thermal zones definition is not available in the DT yet, so
when the driver tries to register all the sensors that fails.

By reducing to 1 the number of sensors on the hi3660, we switch back
to the previous functionnality.

Fixes: 8c6c36846f (thermal/drivers/hisi: Add the dual clusters sensors for hi3660)
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
2018-12-10 20:13:09 -08:00

675 lines
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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_CLUSTER0_SENSOR 2
#define HI6220_CLUSTER1_SENSOR 1
#define HI3660_LITTLE_SENSOR 0
#define HI3660_BIG_SENSOR 1
#define HI3660_G3D_SENSOR 2
#define HI3660_MODEM_SENSOR 3
struct hisi_thermal_data;
struct hisi_thermal_sensor {
struct hisi_thermal_data *data;
struct thermal_zone_device *tzd;
const char *irq_name;
uint32_t id;
uint32_t thres_temp;
};
struct hisi_thermal_ops {
int (*get_temp)(struct hisi_thermal_sensor *sensor);
int (*enable_sensor)(struct hisi_thermal_sensor *sensor);
int (*disable_sensor)(struct hisi_thermal_sensor *sensor);
int (*irq_handler)(struct hisi_thermal_sensor *sensor);
int (*probe)(struct hisi_thermal_data *data);
};
struct hisi_thermal_data {
const struct hisi_thermal_ops *ops;
struct hisi_thermal_sensor *sensor;
struct platform_device *pdev;
struct clk *clk;
void __iomem *regs;
int nr_sensors;
};
/*
* 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_sensor *sensor)
{
struct hisi_thermal_data *data = sensor->data;
hi6220_thermal_alarm_clear(data->regs, 1);
return 0;
}
static int hi3660_thermal_irq_handler(struct hisi_thermal_sensor *sensor)
{
struct hisi_thermal_data *data = sensor->data;
hi3660_thermal_alarm_clear(data->regs, sensor->id, 1);
return 0;
}
static int hi6220_thermal_get_temp(struct hisi_thermal_sensor *sensor)
{
struct hisi_thermal_data *data = sensor->data;
return hi6220_thermal_get_temperature(data->regs);
}
static int hi3660_thermal_get_temp(struct hisi_thermal_sensor *sensor)
{
struct hisi_thermal_data *data = sensor->data;
return hi3660_thermal_get_temperature(data->regs, sensor->id);
}
static int hi6220_thermal_disable_sensor(struct hisi_thermal_sensor *sensor)
{
struct hisi_thermal_data *data = sensor->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_sensor *sensor)
{
struct hisi_thermal_data *data = sensor->data;
/* disable sensor module */
hi3660_thermal_alarm_enable(data->regs, sensor->id, 0);
return 0;
}
static int hi6220_thermal_enable_sensor(struct hisi_thermal_sensor *sensor)
{
struct hisi_thermal_data *data = sensor->data;
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_sensor *sensor)
{
unsigned int value;
struct hisi_thermal_data *data = sensor->data;
/* 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;
int ret;
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->sensor = devm_kzalloc(dev, sizeof(*data->sensor), GFP_KERNEL);
if (!data->sensor)
return -ENOMEM;
data->sensor[0].id = HI6220_CLUSTER0_SENSOR;
data->sensor[0].irq_name = "tsensor_intr";
data->sensor[0].data = data;
data->nr_sensors = 1;
return 0;
}
static int hi3660_thermal_probe(struct hisi_thermal_data *data)
{
struct platform_device *pdev = data->pdev;
struct device *dev = &pdev->dev;
data->nr_sensors = 1;
data->sensor = devm_kzalloc(dev, sizeof(*data->sensor) *
data->nr_sensors, GFP_KERNEL);
if (!data->sensor)
return -ENOMEM;
data->sensor[0].id = HI3660_BIG_SENSOR;
data->sensor[0].irq_name = "tsensor_a73";
data->sensor[0].data = data;
data->sensor[1].id = HI3660_LITTLE_SENSOR;
data->sensor[1].irq_name = "tsensor_a53";
data->sensor[1].data = data;
return 0;
}
static int hisi_thermal_get_temp(void *__data, int *temp)
{
struct hisi_thermal_sensor *sensor = __data;
struct hisi_thermal_data *data = sensor->data;
*temp = data->ops->get_temp(sensor);
dev_dbg(&data->pdev->dev, "tzd=%p, id=%d, temp=%d, thres=%d\n",
sensor->tzd, 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_sensor *sensor = dev;
struct hisi_thermal_data *data = sensor->data;
int temp = 0;
data->ops->irq_handler(sensor);
hisi_thermal_get_temp(sensor, &temp);
if (temp >= sensor->thres_temp) {
dev_crit(&data->pdev->dev,
"sensor <%d> THERMAL ALARM: %d > %d\n",
sensor->id, temp, sensor->thres_temp);
thermal_zone_device_update(sensor->tzd,
THERMAL_EVENT_UNSPECIFIED);
} else {
dev_crit(&data->pdev->dev,
"sensor <%d> THERMAL ALARM stopped: %d < %d\n",
sensor->id, temp, sensor->thres_temp);
}
return IRQ_HANDLED;
}
static int hisi_thermal_register_sensor(struct platform_device *pdev,
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, 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 hisi_thermal_ops hi6220_ops = {
.get_temp = hi6220_thermal_get_temp,
.enable_sensor = hi6220_thermal_enable_sensor,
.disable_sensor = hi6220_thermal_disable_sensor,
.irq_handler = hi6220_thermal_irq_handler,
.probe = hi6220_thermal_probe,
};
static const struct hisi_thermal_ops hi3660_ops = {
.get_temp = hi3660_thermal_get_temp,
.enable_sensor = hi3660_thermal_enable_sensor,
.disable_sensor = hi3660_thermal_disable_sensor,
.irq_handler = hi3660_thermal_irq_handler,
.probe = hi3660_thermal_probe,
};
static const struct of_device_id of_hisi_thermal_match[] = {
{
.compatible = "hisilicon,tsensor",
.data = &hi6220_ops,
},
{
.compatible = "hisilicon,hi3660-tsensor",
.data = &hi3660_ops,
},
{ /* 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 device *dev = &pdev->dev;
struct resource *res;
int i, ret;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->pdev = pdev;
platform_set_drvdata(pdev, data);
data->ops = of_device_get_match_data(dev);
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);
}
ret = data->ops->probe(data);
if (ret)
return ret;
for (i = 0; i < data->nr_sensors; i++) {
struct hisi_thermal_sensor *sensor = &data->sensor[i];
ret = hisi_thermal_register_sensor(pdev, sensor);
if (ret) {
dev_err(dev, "failed to register thermal sensor: %d\n",
ret);
return ret;
}
ret = platform_get_irq(pdev, 0);
if (ret < 0)
return ret;
ret = devm_request_threaded_irq(dev, ret, NULL,
hisi_thermal_alarm_irq_thread,
IRQF_ONESHOT, sensor->irq_name,
sensor);
if (ret < 0) {
dev_err(dev, "Failed to request alarm irq: %d\n", ret);
return ret;
}
ret = data->ops->enable_sensor(sensor);
if (ret) {
dev_err(dev, "Failed to setup the sensor: %d\n", ret);
return ret;
}
hisi_thermal_toggle_sensor(sensor, true);
}
return 0;
}
static int hisi_thermal_remove(struct platform_device *pdev)
{
struct hisi_thermal_data *data = platform_get_drvdata(pdev);
int i;
for (i = 0; i < data->nr_sensors; i++) {
struct hisi_thermal_sensor *sensor = &data->sensor[i];
hisi_thermal_toggle_sensor(sensor, false);
data->ops->disable_sensor(sensor);
}
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int hisi_thermal_suspend(struct device *dev)
{
struct hisi_thermal_data *data = dev_get_drvdata(dev);
int i;
for (i = 0; i < data->nr_sensors; i++)
data->ops->disable_sensor(&data->sensor[i]);
return 0;
}
static int hisi_thermal_resume(struct device *dev)
{
struct hisi_thermal_data *data = dev_get_drvdata(dev);
int i, ret = 0;
for (i = 0; i < data->nr_sensors; i++)
ret |= data->ops->enable_sensor(&data->sensor[i]);
return ret;
}
#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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