mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Linus Walleij](/assets/img/avatar_default.png)
We are not interested in getting this debug print on our
console all the time.
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Stephan Gerhold <stephan@gerhold.net>
Fixes: 6c375eccde
("thermal: db8500: Rewrite to be a pure OF sensor")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20191119074650.2664-1-linus.walleij@linaro.org
262 lines
6.4 KiB
C
262 lines
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* db8500_thermal.c - DB8500 Thermal Management Implementation
|
|
*
|
|
* Copyright (C) 2012 ST-Ericsson
|
|
* Copyright (C) 2012-2019 Linaro Ltd.
|
|
*
|
|
* Authors: Hongbo Zhang, Linus Walleij
|
|
*/
|
|
|
|
#include <linux/cpu_cooling.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/mfd/dbx500-prcmu.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/thermal.h>
|
|
|
|
#define PRCMU_DEFAULT_MEASURE_TIME 0xFFF
|
|
#define PRCMU_DEFAULT_LOW_TEMP 0
|
|
|
|
/**
|
|
* db8500_thermal_points - the interpolation points that trigger
|
|
* interrupts
|
|
*/
|
|
static const unsigned long db8500_thermal_points[] = {
|
|
15000,
|
|
20000,
|
|
25000,
|
|
30000,
|
|
35000,
|
|
40000,
|
|
45000,
|
|
50000,
|
|
55000,
|
|
60000,
|
|
65000,
|
|
70000,
|
|
75000,
|
|
80000,
|
|
/*
|
|
* This is where things start to get really bad for the
|
|
* SoC and the thermal zones should be set up to trigger
|
|
* critical temperature at 85000 mC so we don't get above
|
|
* this point.
|
|
*/
|
|
85000,
|
|
90000,
|
|
95000,
|
|
100000,
|
|
};
|
|
|
|
struct db8500_thermal_zone {
|
|
struct thermal_zone_device *tz;
|
|
enum thermal_trend trend;
|
|
unsigned long interpolated_temp;
|
|
unsigned int cur_index;
|
|
};
|
|
|
|
/* Callback to get current temperature */
|
|
static int db8500_thermal_get_temp(void *data, int *temp)
|
|
{
|
|
struct db8500_thermal_zone *th = data;
|
|
|
|
/*
|
|
* TODO: There is no PRCMU interface to get temperature data currently,
|
|
* so a pseudo temperature is returned , it works for thermal framework
|
|
* and this will be fixed when the PRCMU interface is available.
|
|
*/
|
|
*temp = th->interpolated_temp;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Callback to get temperature changing trend */
|
|
static int db8500_thermal_get_trend(void *data, int trip, enum thermal_trend *trend)
|
|
{
|
|
struct db8500_thermal_zone *th = data;
|
|
|
|
*trend = th->trend;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct thermal_zone_of_device_ops thdev_ops = {
|
|
.get_temp = db8500_thermal_get_temp,
|
|
.get_trend = db8500_thermal_get_trend,
|
|
};
|
|
|
|
static void db8500_thermal_update_config(struct db8500_thermal_zone *th,
|
|
unsigned int idx,
|
|
enum thermal_trend trend,
|
|
unsigned long next_low,
|
|
unsigned long next_high)
|
|
{
|
|
prcmu_stop_temp_sense();
|
|
|
|
th->cur_index = idx;
|
|
th->interpolated_temp = (next_low + next_high)/2;
|
|
th->trend = trend;
|
|
|
|
/*
|
|
* The PRCMU accept absolute temperatures in celsius so divide
|
|
* down the millicelsius with 1000
|
|
*/
|
|
prcmu_config_hotmon((u8)(next_low/1000), (u8)(next_high/1000));
|
|
prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
|
|
}
|
|
|
|
static irqreturn_t prcmu_low_irq_handler(int irq, void *irq_data)
|
|
{
|
|
struct db8500_thermal_zone *th = irq_data;
|
|
unsigned int idx = th->cur_index;
|
|
unsigned long next_low, next_high;
|
|
|
|
if (idx == 0)
|
|
/* Meaningless for thermal management, ignoring it */
|
|
return IRQ_HANDLED;
|
|
|
|
if (idx == 1) {
|
|
next_high = db8500_thermal_points[0];
|
|
next_low = PRCMU_DEFAULT_LOW_TEMP;
|
|
} else {
|
|
next_high = db8500_thermal_points[idx - 1];
|
|
next_low = db8500_thermal_points[idx - 2];
|
|
}
|
|
idx -= 1;
|
|
|
|
db8500_thermal_update_config(th, idx, THERMAL_TREND_DROPPING,
|
|
next_low, next_high);
|
|
dev_dbg(&th->tz->device,
|
|
"PRCMU set max %ld, min %ld\n", next_high, next_low);
|
|
|
|
thermal_zone_device_update(th->tz, THERMAL_EVENT_UNSPECIFIED);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t prcmu_high_irq_handler(int irq, void *irq_data)
|
|
{
|
|
struct db8500_thermal_zone *th = irq_data;
|
|
unsigned int idx = th->cur_index;
|
|
unsigned long next_low, next_high;
|
|
int num_points = ARRAY_SIZE(db8500_thermal_points);
|
|
|
|
if (idx < num_points - 1) {
|
|
next_high = db8500_thermal_points[idx+1];
|
|
next_low = db8500_thermal_points[idx];
|
|
idx += 1;
|
|
|
|
db8500_thermal_update_config(th, idx, THERMAL_TREND_RAISING,
|
|
next_low, next_high);
|
|
|
|
dev_dbg(&th->tz->device,
|
|
"PRCMU set max %ld, min %ld\n", next_high, next_low);
|
|
} else if (idx == num_points - 1)
|
|
/* So we roof out 1 degree over the max point */
|
|
th->interpolated_temp = db8500_thermal_points[idx] + 1;
|
|
|
|
thermal_zone_device_update(th->tz, THERMAL_EVENT_UNSPECIFIED);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int db8500_thermal_probe(struct platform_device *pdev)
|
|
{
|
|
struct db8500_thermal_zone *th = NULL;
|
|
struct device *dev = &pdev->dev;
|
|
int low_irq, high_irq, ret = 0;
|
|
|
|
th = devm_kzalloc(dev, sizeof(*th), GFP_KERNEL);
|
|
if (!th)
|
|
return -ENOMEM;
|
|
|
|
low_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_LOW");
|
|
if (low_irq < 0) {
|
|
dev_err(dev, "Get IRQ_HOTMON_LOW failed\n");
|
|
return low_irq;
|
|
}
|
|
|
|
ret = devm_request_threaded_irq(dev, low_irq, NULL,
|
|
prcmu_low_irq_handler, IRQF_NO_SUSPEND | IRQF_ONESHOT,
|
|
"dbx500_temp_low", th);
|
|
if (ret < 0) {
|
|
dev_err(dev, "failed to allocate temp low irq\n");
|
|
return ret;
|
|
}
|
|
|
|
high_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_HIGH");
|
|
if (high_irq < 0) {
|
|
dev_err(dev, "Get IRQ_HOTMON_HIGH failed\n");
|
|
return high_irq;
|
|
}
|
|
|
|
ret = devm_request_threaded_irq(dev, high_irq, NULL,
|
|
prcmu_high_irq_handler, IRQF_NO_SUSPEND | IRQF_ONESHOT,
|
|
"dbx500_temp_high", th);
|
|
if (ret < 0) {
|
|
dev_err(dev, "failed to allocate temp high irq\n");
|
|
return ret;
|
|
}
|
|
|
|
/* register of thermal sensor and get info from DT */
|
|
th->tz = devm_thermal_zone_of_sensor_register(dev, 0, th, &thdev_ops);
|
|
if (IS_ERR(th->tz)) {
|
|
dev_err(dev, "register thermal zone sensor failed\n");
|
|
return PTR_ERR(th->tz);
|
|
}
|
|
dev_info(dev, "thermal zone sensor registered\n");
|
|
|
|
/* Start measuring at the lowest point */
|
|
db8500_thermal_update_config(th, 0, THERMAL_TREND_STABLE,
|
|
PRCMU_DEFAULT_LOW_TEMP,
|
|
db8500_thermal_points[0]);
|
|
|
|
platform_set_drvdata(pdev, th);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int db8500_thermal_suspend(struct platform_device *pdev,
|
|
pm_message_t state)
|
|
{
|
|
prcmu_stop_temp_sense();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int db8500_thermal_resume(struct platform_device *pdev)
|
|
{
|
|
struct db8500_thermal_zone *th = platform_get_drvdata(pdev);
|
|
|
|
/* Resume and start measuring at the lowest point */
|
|
db8500_thermal_update_config(th, 0, THERMAL_TREND_STABLE,
|
|
PRCMU_DEFAULT_LOW_TEMP,
|
|
db8500_thermal_points[0]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id db8500_thermal_match[] = {
|
|
{ .compatible = "stericsson,db8500-thermal" },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, db8500_thermal_match);
|
|
|
|
static struct platform_driver db8500_thermal_driver = {
|
|
.driver = {
|
|
.name = "db8500-thermal",
|
|
.of_match_table = of_match_ptr(db8500_thermal_match),
|
|
},
|
|
.probe = db8500_thermal_probe,
|
|
.suspend = db8500_thermal_suspend,
|
|
.resume = db8500_thermal_resume,
|
|
};
|
|
|
|
module_platform_driver(db8500_thermal_driver);
|
|
|
|
MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@stericsson.com>");
|
|
MODULE_DESCRIPTION("DB8500 thermal driver");
|
|
MODULE_LICENSE("GPL");
|