Merge branch 'for_3.12/imx' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal into imx
This commit is contained in:
commit
cba77f5312
17
Documentation/devicetree/bindings/thermal/imx-thermal.txt
Normal file
17
Documentation/devicetree/bindings/thermal/imx-thermal.txt
Normal file
|
@ -0,0 +1,17 @@
|
|||
* Temperature Monitor (TEMPMON) on Freescale i.MX SoCs
|
||||
|
||||
Required properties:
|
||||
- compatible : "fsl,imx6q-thermal"
|
||||
- fsl,tempmon : phandle pointer to system controller that contains TEMPMON
|
||||
control registers, e.g. ANATOP on imx6q.
|
||||
- fsl,tempmon-data : phandle pointer to fuse controller that contains TEMPMON
|
||||
calibration data, e.g. OCOTP on imx6q. The details about calibration data
|
||||
can be found in SoC Reference Manual.
|
||||
|
||||
Example:
|
||||
|
||||
tempmon {
|
||||
compatible = "fsl,imx6q-tempmon";
|
||||
fsl,tempmon = <&anatop>;
|
||||
fsl,tempmon-data = <&ocotp>;
|
||||
};
|
|
@ -91,6 +91,17 @@ config THERMAL_EMULATION
|
|||
because userland can easily disable the thermal policy by simply
|
||||
flooding this sysfs node with low temperature values.
|
||||
|
||||
config IMX_THERMAL
|
||||
tristate "Temperature sensor driver for Freescale i.MX SoCs"
|
||||
depends on CPU_THERMAL
|
||||
depends on MFD_SYSCON
|
||||
depends on OF
|
||||
help
|
||||
Support for Temperature Monitor (TEMPMON) found on Freescale i.MX SoCs.
|
||||
It supports one critical trip point and one passive trip point. The
|
||||
cpufreq is used as the cooling device to throttle CPUs when the
|
||||
passive trip is crossed.
|
||||
|
||||
config SPEAR_THERMAL
|
||||
bool "SPEAr thermal sensor driver"
|
||||
depends on PLAT_SPEAR
|
||||
|
|
|
@ -21,6 +21,7 @@ obj-$(CONFIG_EXYNOS_THERMAL) += exynos_thermal.o
|
|||
obj-$(CONFIG_DOVE_THERMAL) += dove_thermal.o
|
||||
obj-$(CONFIG_DB8500_THERMAL) += db8500_thermal.o
|
||||
obj-$(CONFIG_ARMADA_THERMAL) += armada_thermal.o
|
||||
obj-$(CONFIG_IMX_THERMAL) += imx_thermal.o
|
||||
obj-$(CONFIG_DB8500_CPUFREQ_COOLING) += db8500_cpufreq_cooling.o
|
||||
obj-$(CONFIG_INTEL_POWERCLAMP) += intel_powerclamp.o
|
||||
obj-$(CONFIG_X86_PKG_TEMP_THERMAL) += x86_pkg_temp_thermal.o
|
||||
|
|
397
drivers/thermal/imx_thermal.c
Normal file
397
drivers/thermal/imx_thermal.c
Normal file
|
@ -0,0 +1,397 @@
|
|||
/*
|
||||
* Copyright 2013 Freescale Semiconductor, Inc.
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/cpu_cooling.h>
|
||||
#include <linux/cpufreq.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/device.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/mfd/syscon.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/regmap.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/thermal.h>
|
||||
#include <linux/types.h>
|
||||
|
||||
#define REG_SET 0x4
|
||||
#define REG_CLR 0x8
|
||||
#define REG_TOG 0xc
|
||||
|
||||
#define MISC0 0x0150
|
||||
#define MISC0_REFTOP_SELBIASOFF (1 << 3)
|
||||
|
||||
#define TEMPSENSE0 0x0180
|
||||
#define TEMPSENSE0_TEMP_CNT_SHIFT 8
|
||||
#define TEMPSENSE0_TEMP_CNT_MASK (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT)
|
||||
#define TEMPSENSE0_FINISHED (1 << 2)
|
||||
#define TEMPSENSE0_MEASURE_TEMP (1 << 1)
|
||||
#define TEMPSENSE0_POWER_DOWN (1 << 0)
|
||||
|
||||
#define TEMPSENSE1 0x0190
|
||||
#define TEMPSENSE1_MEASURE_FREQ 0xffff
|
||||
|
||||
#define OCOTP_ANA1 0x04e0
|
||||
|
||||
/* The driver supports 1 passive trip point and 1 critical trip point */
|
||||
enum imx_thermal_trip {
|
||||
IMX_TRIP_PASSIVE,
|
||||
IMX_TRIP_CRITICAL,
|
||||
IMX_TRIP_NUM,
|
||||
};
|
||||
|
||||
/*
|
||||
* It defines the temperature in millicelsius for passive trip point
|
||||
* that will trigger cooling action when crossed.
|
||||
*/
|
||||
#define IMX_TEMP_PASSIVE 85000
|
||||
|
||||
/*
|
||||
* The maximum die temperature on imx parts is 105C, let's give some cushion
|
||||
* for noise and possible temperature rise between measurements.
|
||||
*/
|
||||
#define IMX_TEMP_CRITICAL 100000
|
||||
|
||||
#define IMX_POLLING_DELAY 2000 /* millisecond */
|
||||
#define IMX_PASSIVE_DELAY 1000
|
||||
|
||||
struct imx_thermal_data {
|
||||
struct thermal_zone_device *tz;
|
||||
struct thermal_cooling_device *cdev;
|
||||
enum thermal_device_mode mode;
|
||||
struct regmap *tempmon;
|
||||
int c1, c2; /* See formula in imx_get_sensor_data() */
|
||||
};
|
||||
|
||||
static int imx_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
|
||||
{
|
||||
struct imx_thermal_data *data = tz->devdata;
|
||||
struct regmap *map = data->tempmon;
|
||||
static unsigned long last_temp;
|
||||
unsigned int n_meas;
|
||||
u32 val;
|
||||
|
||||
/*
|
||||
* Every time we measure the temperature, we will power on the
|
||||
* temperature sensor, enable measurements, take a reading,
|
||||
* disable measurements, power off the temperature sensor.
|
||||
*/
|
||||
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
|
||||
regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
|
||||
|
||||
/*
|
||||
* According to the temp sensor designers, it may require up to ~17us
|
||||
* to complete a measurement.
|
||||
*/
|
||||
usleep_range(20, 50);
|
||||
|
||||
regmap_read(map, TEMPSENSE0, &val);
|
||||
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
|
||||
regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
|
||||
|
||||
if ((val & TEMPSENSE0_FINISHED) == 0) {
|
||||
dev_dbg(&tz->device, "temp measurement never finished\n");
|
||||
return -EAGAIN;
|
||||
}
|
||||
|
||||
n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT;
|
||||
|
||||
/* See imx_get_sensor_data() for formula derivation */
|
||||
*temp = data->c2 + data->c1 * n_meas;
|
||||
|
||||
if (*temp != last_temp) {
|
||||
dev_dbg(&tz->device, "millicelsius: %ld\n", *temp);
|
||||
last_temp = *temp;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int imx_get_mode(struct thermal_zone_device *tz,
|
||||
enum thermal_device_mode *mode)
|
||||
{
|
||||
struct imx_thermal_data *data = tz->devdata;
|
||||
|
||||
*mode = data->mode;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int imx_set_mode(struct thermal_zone_device *tz,
|
||||
enum thermal_device_mode mode)
|
||||
{
|
||||
struct imx_thermal_data *data = tz->devdata;
|
||||
|
||||
if (mode == THERMAL_DEVICE_ENABLED) {
|
||||
tz->polling_delay = IMX_POLLING_DELAY;
|
||||
tz->passive_delay = IMX_PASSIVE_DELAY;
|
||||
} else {
|
||||
tz->polling_delay = 0;
|
||||
tz->passive_delay = 0;
|
||||
}
|
||||
|
||||
data->mode = mode;
|
||||
thermal_zone_device_update(tz);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int imx_get_trip_type(struct thermal_zone_device *tz, int trip,
|
||||
enum thermal_trip_type *type)
|
||||
{
|
||||
*type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE :
|
||||
THERMAL_TRIP_CRITICAL;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int imx_get_crit_temp(struct thermal_zone_device *tz,
|
||||
unsigned long *temp)
|
||||
{
|
||||
*temp = IMX_TEMP_CRITICAL;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
|
||||
unsigned long *temp)
|
||||
{
|
||||
*temp = (trip == IMX_TRIP_PASSIVE) ? IMX_TEMP_PASSIVE :
|
||||
IMX_TEMP_CRITICAL;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int imx_bind(struct thermal_zone_device *tz,
|
||||
struct thermal_cooling_device *cdev)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev,
|
||||
THERMAL_NO_LIMIT,
|
||||
THERMAL_NO_LIMIT);
|
||||
if (ret) {
|
||||
dev_err(&tz->device,
|
||||
"binding zone %s with cdev %s failed:%d\n",
|
||||
tz->type, cdev->type, ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int imx_unbind(struct thermal_zone_device *tz,
|
||||
struct thermal_cooling_device *cdev)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev);
|
||||
if (ret) {
|
||||
dev_err(&tz->device,
|
||||
"unbinding zone %s with cdev %s failed:%d\n",
|
||||
tz->type, cdev->type, ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct thermal_zone_device_ops imx_tz_ops = {
|
||||
.bind = imx_bind,
|
||||
.unbind = imx_unbind,
|
||||
.get_temp = imx_get_temp,
|
||||
.get_mode = imx_get_mode,
|
||||
.set_mode = imx_set_mode,
|
||||
.get_trip_type = imx_get_trip_type,
|
||||
.get_trip_temp = imx_get_trip_temp,
|
||||
.get_crit_temp = imx_get_crit_temp,
|
||||
};
|
||||
|
||||
static int imx_get_sensor_data(struct platform_device *pdev)
|
||||
{
|
||||
struct imx_thermal_data *data = platform_get_drvdata(pdev);
|
||||
struct regmap *map;
|
||||
int t1, t2, n1, n2;
|
||||
int ret;
|
||||
u32 val;
|
||||
|
||||
map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
|
||||
"fsl,tempmon-data");
|
||||
if (IS_ERR(map)) {
|
||||
ret = PTR_ERR(map);
|
||||
dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = regmap_read(map, OCOTP_ANA1, &val);
|
||||
if (ret) {
|
||||
dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
if (val == 0 || val == ~0) {
|
||||
dev_err(&pdev->dev, "invalid sensor calibration data\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Sensor data layout:
|
||||
* [31:20] - sensor value @ 25C
|
||||
* [19:8] - sensor value of hot
|
||||
* [7:0] - hot temperature value
|
||||
*/
|
||||
n1 = val >> 20;
|
||||
n2 = (val & 0xfff00) >> 8;
|
||||
t2 = val & 0xff;
|
||||
t1 = 25; /* t1 always 25C */
|
||||
|
||||
/*
|
||||
* Derived from linear interpolation,
|
||||
* Tmeas = T2 + (Nmeas - N2) * (T1 - T2) / (N1 - N2)
|
||||
* We want to reduce this down to the minimum computation necessary
|
||||
* for each temperature read. Also, we want Tmeas in millicelsius
|
||||
* and we don't want to lose precision from integer division. So...
|
||||
* milli_Tmeas = 1000 * T2 + 1000 * (Nmeas - N2) * (T1 - T2) / (N1 - N2)
|
||||
* Let constant c1 = 1000 * (T1 - T2) / (N1 - N2)
|
||||
* milli_Tmeas = (1000 * T2) + c1 * (Nmeas - N2)
|
||||
* milli_Tmeas = (1000 * T2) + (c1 * Nmeas) - (c1 * N2)
|
||||
* Let constant c2 = (1000 * T2) - (c1 * N2)
|
||||
* milli_Tmeas = c2 + (c1 * Nmeas)
|
||||
*/
|
||||
data->c1 = 1000 * (t1 - t2) / (n1 - n2);
|
||||
data->c2 = 1000 * t2 - data->c1 * n2;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int imx_thermal_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct imx_thermal_data *data;
|
||||
struct cpumask clip_cpus;
|
||||
struct regmap *map;
|
||||
int ret;
|
||||
|
||||
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
|
||||
if (!data)
|
||||
return -ENOMEM;
|
||||
|
||||
map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
|
||||
if (IS_ERR(map)) {
|
||||
ret = PTR_ERR(map);
|
||||
dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
data->tempmon = map;
|
||||
|
||||
platform_set_drvdata(pdev, data);
|
||||
|
||||
ret = imx_get_sensor_data(pdev);
|
||||
if (ret) {
|
||||
dev_err(&pdev->dev, "failed to get sensor data\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Make sure sensor is in known good state for measurements */
|
||||
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
|
||||
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
|
||||
regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
|
||||
regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF);
|
||||
regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
|
||||
|
||||
cpumask_set_cpu(0, &clip_cpus);
|
||||
data->cdev = cpufreq_cooling_register(&clip_cpus);
|
||||
if (IS_ERR(data->cdev)) {
|
||||
ret = PTR_ERR(data->cdev);
|
||||
dev_err(&pdev->dev,
|
||||
"failed to register cpufreq cooling device: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
data->tz = thermal_zone_device_register("imx_thermal_zone",
|
||||
IMX_TRIP_NUM, 0, data,
|
||||
&imx_tz_ops, NULL,
|
||||
IMX_PASSIVE_DELAY,
|
||||
IMX_POLLING_DELAY);
|
||||
if (IS_ERR(data->tz)) {
|
||||
ret = PTR_ERR(data->tz);
|
||||
dev_err(&pdev->dev,
|
||||
"failed to register thermal zone device %d\n", ret);
|
||||
cpufreq_cooling_unregister(data->cdev);
|
||||
return ret;
|
||||
}
|
||||
|
||||
data->mode = THERMAL_DEVICE_ENABLED;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int imx_thermal_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct imx_thermal_data *data = platform_get_drvdata(pdev);
|
||||
|
||||
thermal_zone_device_unregister(data->tz);
|
||||
cpufreq_cooling_unregister(data->cdev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM_SLEEP
|
||||
static int imx_thermal_suspend(struct device *dev)
|
||||
{
|
||||
struct imx_thermal_data *data = dev_get_drvdata(dev);
|
||||
struct regmap *map = data->tempmon;
|
||||
u32 val;
|
||||
|
||||
regmap_read(map, TEMPSENSE0, &val);
|
||||
if ((val & TEMPSENSE0_POWER_DOWN) == 0) {
|
||||
/*
|
||||
* If a measurement is taking place, wait for a long enough
|
||||
* time for it to finish, and then check again. If it still
|
||||
* does not finish, something must go wrong.
|
||||
*/
|
||||
udelay(50);
|
||||
regmap_read(map, TEMPSENSE0, &val);
|
||||
if ((val & TEMPSENSE0_POWER_DOWN) == 0)
|
||||
return -ETIMEDOUT;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int imx_thermal_resume(struct device *dev)
|
||||
{
|
||||
/* Nothing to do for now */
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
|
||||
imx_thermal_suspend, imx_thermal_resume);
|
||||
|
||||
static const struct of_device_id of_imx_thermal_match[] = {
|
||||
{ .compatible = "fsl,imx6q-tempmon", },
|
||||
{ /* end */ }
|
||||
};
|
||||
|
||||
static struct platform_driver imx_thermal = {
|
||||
.driver = {
|
||||
.name = "imx_thermal",
|
||||
.owner = THIS_MODULE,
|
||||
.pm = &imx_thermal_pm_ops,
|
||||
.of_match_table = of_imx_thermal_match,
|
||||
},
|
||||
.probe = imx_thermal_probe,
|
||||
.remove = imx_thermal_remove,
|
||||
};
|
||||
module_platform_driver(imx_thermal);
|
||||
|
||||
MODULE_AUTHOR("Freescale Semiconductor, Inc.");
|
||||
MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_ALIAS("platform:imx-thermal");
|
Loading…
Reference in a new issue