2013-06-24 00:30:44 -06:00
|
|
|
/*
|
|
|
|
* 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.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
2013-12-23 13:49:22 -07:00
|
|
|
#include <linux/clk.h>
|
2013-06-24 00:30:44 -06:00
|
|
|
#include <linux/cpu_cooling.h>
|
|
|
|
#include <linux/delay.h>
|
|
|
|
#include <linux/device.h>
|
|
|
|
#include <linux/init.h>
|
2013-08-01 10:33:12 -06:00
|
|
|
#include <linux/interrupt.h>
|
2013-06-24 00:30:44 -06:00
|
|
|
#include <linux/io.h>
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/mfd/syscon.h>
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/of.h>
|
2014-08-06 01:12:09 -06:00
|
|
|
#include <linux/of_device.h>
|
2013-06-24 00:30:44 -06:00
|
|
|
#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)
|
2014-08-06 01:12:09 -06:00
|
|
|
#define MISC1 0x0160
|
|
|
|
#define MISC1_IRQ_TEMPHIGH (1 << 29)
|
|
|
|
/* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */
|
|
|
|
#define MISC1_IRQ_TEMPLOW (1 << 28)
|
|
|
|
#define MISC1_IRQ_TEMPPANIC (1 << 27)
|
2013-06-24 00:30:44 -06:00
|
|
|
|
|
|
|
#define TEMPSENSE0 0x0180
|
2013-08-01 10:33:12 -06:00
|
|
|
#define TEMPSENSE0_ALARM_VALUE_SHIFT 20
|
|
|
|
#define TEMPSENSE0_ALARM_VALUE_MASK (0xfff << TEMPSENSE0_ALARM_VALUE_SHIFT)
|
2013-06-24 00:30:44 -06:00
|
|
|
#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
|
2014-08-06 01:12:09 -06:00
|
|
|
/* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */
|
|
|
|
#define TEMPSENSE2 0x0290
|
|
|
|
#define TEMPSENSE2_LOW_VALUE_SHIFT 0
|
|
|
|
#define TEMPSENSE2_LOW_VALUE_MASK 0xfff
|
|
|
|
#define TEMPSENSE2_PANIC_VALUE_SHIFT 16
|
|
|
|
#define TEMPSENSE2_PANIC_VALUE_MASK 0xfff0000
|
2013-06-24 00:30:44 -06:00
|
|
|
|
|
|
|
#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
|
|
|
|
|
|
|
|
#define IMX_POLLING_DELAY 2000 /* millisecond */
|
|
|
|
#define IMX_PASSIVE_DELAY 1000
|
|
|
|
|
2014-02-12 03:06:35 -07:00
|
|
|
#define FACTOR0 10000000
|
|
|
|
#define FACTOR1 15976
|
|
|
|
#define FACTOR2 4297157
|
|
|
|
|
2014-08-06 01:12:09 -06:00
|
|
|
#define TEMPMON_IMX6Q 1
|
|
|
|
#define TEMPMON_IMX6SX 2
|
|
|
|
|
|
|
|
struct thermal_soc_data {
|
|
|
|
u32 version;
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct thermal_soc_data thermal_imx6q_data = {
|
|
|
|
.version = TEMPMON_IMX6Q,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct thermal_soc_data thermal_imx6sx_data = {
|
|
|
|
.version = TEMPMON_IMX6SX,
|
|
|
|
};
|
|
|
|
|
2013-06-24 00:30:44 -06:00
|
|
|
struct imx_thermal_data {
|
|
|
|
struct thermal_zone_device *tz;
|
|
|
|
struct thermal_cooling_device *cdev;
|
|
|
|
enum thermal_device_mode mode;
|
|
|
|
struct regmap *tempmon;
|
2014-02-12 03:06:35 -07:00
|
|
|
u32 c1, c2; /* See formula in imx_get_sensor_data() */
|
2013-08-01 10:33:11 -06:00
|
|
|
unsigned long temp_passive;
|
|
|
|
unsigned long temp_critical;
|
2013-08-01 10:33:12 -06:00
|
|
|
unsigned long alarm_temp;
|
|
|
|
unsigned long last_temp;
|
|
|
|
bool irq_enabled;
|
|
|
|
int irq;
|
2013-12-23 13:49:22 -07:00
|
|
|
struct clk *thermal_clk;
|
2014-08-06 01:12:09 -06:00
|
|
|
const struct thermal_soc_data *socdata;
|
2013-06-24 00:30:44 -06:00
|
|
|
};
|
|
|
|
|
2014-08-06 01:12:09 -06:00
|
|
|
static void imx_set_panic_temp(struct imx_thermal_data *data,
|
|
|
|
signed long panic_temp)
|
|
|
|
{
|
|
|
|
struct regmap *map = data->tempmon;
|
|
|
|
int critical_value;
|
|
|
|
|
|
|
|
critical_value = (data->c2 - panic_temp) / data->c1;
|
|
|
|
regmap_write(map, TEMPSENSE2 + REG_CLR, TEMPSENSE2_PANIC_VALUE_MASK);
|
|
|
|
regmap_write(map, TEMPSENSE2 + REG_SET, critical_value <<
|
|
|
|
TEMPSENSE2_PANIC_VALUE_SHIFT);
|
|
|
|
}
|
|
|
|
|
2013-08-01 10:33:12 -06:00
|
|
|
static void imx_set_alarm_temp(struct imx_thermal_data *data,
|
|
|
|
signed long alarm_temp)
|
|
|
|
{
|
|
|
|
struct regmap *map = data->tempmon;
|
|
|
|
int alarm_value;
|
|
|
|
|
|
|
|
data->alarm_temp = alarm_temp;
|
2014-02-12 03:06:35 -07:00
|
|
|
alarm_value = (data->c2 - alarm_temp) / data->c1;
|
2013-08-01 10:33:12 -06:00
|
|
|
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_ALARM_VALUE_MASK);
|
|
|
|
regmap_write(map, TEMPSENSE0 + REG_SET, alarm_value <<
|
|
|
|
TEMPSENSE0_ALARM_VALUE_SHIFT);
|
|
|
|
}
|
|
|
|
|
2013-06-24 00:30:44 -06:00
|
|
|
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;
|
|
|
|
unsigned int n_meas;
|
2013-08-01 10:33:12 -06:00
|
|
|
bool wait;
|
2013-06-24 00:30:44 -06:00
|
|
|
u32 val;
|
|
|
|
|
2013-08-01 10:33:12 -06:00
|
|
|
if (data->mode == THERMAL_DEVICE_ENABLED) {
|
|
|
|
/* Check if a measurement is currently in progress */
|
|
|
|
regmap_read(map, TEMPSENSE0, &val);
|
|
|
|
wait = !(val & TEMPSENSE0_FINISHED);
|
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* 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);
|
|
|
|
|
|
|
|
wait = true;
|
|
|
|
}
|
2013-06-24 00:30:44 -06:00
|
|
|
|
|
|
|
/*
|
|
|
|
* According to the temp sensor designers, it may require up to ~17us
|
|
|
|
* to complete a measurement.
|
|
|
|
*/
|
2013-08-01 10:33:12 -06:00
|
|
|
if (wait)
|
|
|
|
usleep_range(20, 50);
|
2013-06-24 00:30:44 -06:00
|
|
|
|
|
|
|
regmap_read(map, TEMPSENSE0, &val);
|
2013-08-01 10:33:12 -06:00
|
|
|
|
|
|
|
if (data->mode != THERMAL_DEVICE_ENABLED) {
|
|
|
|
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
|
|
|
|
regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
|
|
|
|
}
|
2013-06-24 00:30:44 -06:00
|
|
|
|
|
|
|
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 */
|
2014-02-12 03:06:35 -07:00
|
|
|
*temp = data->c2 - n_meas * data->c1;
|
2013-06-24 00:30:44 -06:00
|
|
|
|
2014-08-06 01:12:09 -06:00
|
|
|
/* Update alarm value to next higher trip point for TEMPMON_IMX6Q */
|
|
|
|
if (data->socdata->version == TEMPMON_IMX6Q) {
|
|
|
|
if (data->alarm_temp == data->temp_passive &&
|
|
|
|
*temp >= data->temp_passive)
|
|
|
|
imx_set_alarm_temp(data, data->temp_critical);
|
|
|
|
if (data->alarm_temp == data->temp_critical &&
|
|
|
|
*temp < data->temp_passive) {
|
|
|
|
imx_set_alarm_temp(data, data->temp_passive);
|
|
|
|
dev_dbg(&tz->device, "thermal alarm off: T < %lu\n",
|
|
|
|
data->alarm_temp / 1000);
|
|
|
|
}
|
2013-08-01 10:33:12 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
if (*temp != data->last_temp) {
|
2013-06-24 00:30:44 -06:00
|
|
|
dev_dbg(&tz->device, "millicelsius: %ld\n", *temp);
|
2013-08-01 10:33:12 -06:00
|
|
|
data->last_temp = *temp;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Reenable alarm IRQ if temperature below alarm temperature */
|
|
|
|
if (!data->irq_enabled && *temp < data->alarm_temp) {
|
|
|
|
data->irq_enabled = true;
|
|
|
|
enable_irq(data->irq);
|
2013-06-24 00:30:44 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
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;
|
2013-08-01 10:33:12 -06:00
|
|
|
struct regmap *map = data->tempmon;
|
2013-06-24 00:30:44 -06:00
|
|
|
|
|
|
|
if (mode == THERMAL_DEVICE_ENABLED) {
|
|
|
|
tz->polling_delay = IMX_POLLING_DELAY;
|
|
|
|
tz->passive_delay = IMX_PASSIVE_DELAY;
|
2013-08-01 10:33:12 -06:00
|
|
|
|
|
|
|
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
|
|
|
|
regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
|
|
|
|
|
|
|
|
if (!data->irq_enabled) {
|
|
|
|
data->irq_enabled = true;
|
|
|
|
enable_irq(data->irq);
|
|
|
|
}
|
2013-06-24 00:30:44 -06:00
|
|
|
} else {
|
2013-08-01 10:33:12 -06:00
|
|
|
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
|
|
|
|
regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
|
|
|
|
|
2013-06-24 00:30:44 -06:00
|
|
|
tz->polling_delay = 0;
|
|
|
|
tz->passive_delay = 0;
|
2013-08-01 10:33:12 -06:00
|
|
|
|
|
|
|
if (data->irq_enabled) {
|
|
|
|
disable_irq(data->irq);
|
|
|
|
data->irq_enabled = false;
|
|
|
|
}
|
2013-06-24 00:30:44 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
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)
|
|
|
|
{
|
2013-08-01 10:33:11 -06:00
|
|
|
struct imx_thermal_data *data = tz->devdata;
|
|
|
|
|
|
|
|
*temp = data->temp_critical;
|
2013-06-24 00:30:44 -06:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
|
|
|
|
unsigned long *temp)
|
|
|
|
{
|
2013-08-01 10:33:11 -06:00
|
|
|
struct imx_thermal_data *data = tz->devdata;
|
|
|
|
|
|
|
|
*temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive :
|
|
|
|
data->temp_critical;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
|
|
|
|
unsigned long temp)
|
|
|
|
{
|
|
|
|
struct imx_thermal_data *data = tz->devdata;
|
|
|
|
|
|
|
|
if (trip == IMX_TRIP_CRITICAL)
|
|
|
|
return -EPERM;
|
|
|
|
|
|
|
|
if (temp > IMX_TEMP_PASSIVE)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
data->temp_passive = temp;
|
|
|
|
|
2013-08-01 10:33:12 -06:00
|
|
|
imx_set_alarm_temp(data, temp);
|
|
|
|
|
2013-06-24 00:30:44 -06:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2014-01-06 05:54:34 -07:00
|
|
|
static struct thermal_zone_device_ops imx_tz_ops = {
|
2013-06-24 00:30:44 -06:00
|
|
|
.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,
|
2013-08-01 10:33:11 -06:00
|
|
|
.set_trip_temp = imx_set_trip_temp,
|
2013-06-24 00:30:44 -06:00
|
|
|
};
|
|
|
|
|
|
|
|
static int imx_get_sensor_data(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct imx_thermal_data *data = platform_get_drvdata(pdev);
|
|
|
|
struct regmap *map;
|
2014-06-20 01:03:06 -06:00
|
|
|
int t1, n1;
|
2013-06-24 00:30:44 -06:00
|
|
|
int ret;
|
|
|
|
u32 val;
|
2014-02-12 03:06:35 -07:00
|
|
|
u64 temp64;
|
2013-06-24 00:30:44 -06:00
|
|
|
|
|
|
|
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
|
2014-02-12 03:06:35 -07:00
|
|
|
* Use universal formula now and only need sensor value @ 25C
|
|
|
|
* slope = 0.4297157 - (0.0015976 * 25C fuse)
|
2013-06-24 00:30:44 -06:00
|
|
|
*/
|
|
|
|
n1 = val >> 20;
|
|
|
|
t1 = 25; /* t1 always 25C */
|
|
|
|
|
|
|
|
/*
|
2014-02-12 03:06:35 -07:00
|
|
|
* Derived from linear interpolation:
|
|
|
|
* slope = 0.4297157 - (0.0015976 * 25C fuse)
|
|
|
|
* slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0
|
|
|
|
* (Nmeas - n1) / (Tmeas - t1) = slope
|
2013-06-24 00:30:44 -06:00
|
|
|
* 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...
|
2014-02-12 03:06:35 -07:00
|
|
|
* Tmeas = (Nmeas - n1) / slope + t1
|
|
|
|
* milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1
|
|
|
|
* milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1
|
|
|
|
* Let constant c1 = (-1000 / slope)
|
|
|
|
* milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1
|
|
|
|
* Let constant c2 = n1 *c1 + 1000 * t1
|
|
|
|
* milli_Tmeas = c2 - Nmeas * c1
|
2013-06-24 00:30:44 -06:00
|
|
|
*/
|
2014-02-12 03:06:35 -07:00
|
|
|
temp64 = FACTOR0;
|
|
|
|
temp64 *= 1000;
|
|
|
|
do_div(temp64, FACTOR1 * n1 - FACTOR2);
|
|
|
|
data->c1 = temp64;
|
|
|
|
data->c2 = n1 * data->c1 + 1000 * t1;
|
2013-06-24 00:30:44 -06:00
|
|
|
|
2013-08-01 10:33:11 -06:00
|
|
|
/*
|
2014-06-20 01:03:06 -06:00
|
|
|
* Set the default passive cooling trip point,
|
|
|
|
* can be changed from userspace.
|
2013-08-01 10:33:11 -06:00
|
|
|
*/
|
2014-06-20 01:03:06 -06:00
|
|
|
data->temp_passive = IMX_TEMP_PASSIVE;
|
2013-08-01 10:33:11 -06:00
|
|
|
|
|
|
|
/*
|
2014-06-20 01:03:06 -06:00
|
|
|
* The maximum die temperature set to 20 C higher than
|
|
|
|
* IMX_TEMP_PASSIVE.
|
2013-08-01 10:33:11 -06:00
|
|
|
*/
|
2014-06-20 01:03:06 -06:00
|
|
|
data->temp_critical = 1000 * 20 + data->temp_passive;
|
2013-08-01 10:33:11 -06:00
|
|
|
|
2013-06-24 00:30:44 -06:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2013-08-01 10:33:12 -06:00
|
|
|
static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
|
|
|
|
{
|
|
|
|
struct imx_thermal_data *data = dev;
|
|
|
|
|
|
|
|
disable_irq_nosync(irq);
|
|
|
|
data->irq_enabled = false;
|
|
|
|
|
|
|
|
return IRQ_WAKE_THREAD;
|
|
|
|
}
|
|
|
|
|
|
|
|
static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
|
|
|
|
{
|
|
|
|
struct imx_thermal_data *data = dev;
|
|
|
|
|
|
|
|
dev_dbg(&data->tz->device, "THERMAL ALARM: T > %lu\n",
|
|
|
|
data->alarm_temp / 1000);
|
|
|
|
|
|
|
|
thermal_zone_device_update(data->tz);
|
|
|
|
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
|
2014-08-06 01:12:09 -06:00
|
|
|
static const struct of_device_id of_imx_thermal_match[] = {
|
|
|
|
{ .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
|
|
|
|
{ .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
|
|
|
|
{ /* end */ }
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
|
|
|
|
|
2013-06-24 00:30:44 -06:00
|
|
|
static int imx_thermal_probe(struct platform_device *pdev)
|
|
|
|
{
|
2014-08-06 01:12:09 -06:00
|
|
|
const struct of_device_id *of_id =
|
|
|
|
of_match_device(of_imx_thermal_match, &pdev->dev);
|
2013-06-24 00:30:44 -06:00
|
|
|
struct imx_thermal_data *data;
|
|
|
|
struct regmap *map;
|
2013-08-01 10:33:12 -06:00
|
|
|
int measure_freq;
|
2013-06-24 00:30:44 -06:00
|
|
|
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;
|
|
|
|
|
2014-08-06 01:12:09 -06:00
|
|
|
data->socdata = of_id->data;
|
|
|
|
|
|
|
|
/* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
|
|
|
|
if (data->socdata->version == TEMPMON_IMX6SX) {
|
|
|
|
regmap_write(map, MISC1 + REG_CLR, MISC1_IRQ_TEMPHIGH |
|
|
|
|
MISC1_IRQ_TEMPLOW | MISC1_IRQ_TEMPPANIC);
|
|
|
|
/*
|
|
|
|
* reset value of LOW ALARM is incorrect, set it to lowest
|
|
|
|
* value to avoid false trigger of low alarm.
|
|
|
|
*/
|
|
|
|
regmap_write(map, TEMPSENSE2 + REG_SET,
|
|
|
|
TEMPSENSE2_LOW_VALUE_MASK);
|
|
|
|
}
|
|
|
|
|
2013-08-01 10:33:12 -06:00
|
|
|
data->irq = platform_get_irq(pdev, 0);
|
|
|
|
if (data->irq < 0)
|
|
|
|
return data->irq;
|
|
|
|
|
|
|
|
ret = devm_request_threaded_irq(&pdev->dev, data->irq,
|
|
|
|
imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
|
|
|
|
0, "imx_thermal", data);
|
|
|
|
if (ret < 0) {
|
|
|
|
dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2013-06-24 00:30:44 -06:00
|
|
|
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);
|
|
|
|
|
2014-12-03 21:11:45 -07:00
|
|
|
data->cdev = cpufreq_cooling_register(cpu_present_mask);
|
2013-06-24 00:30:44 -06:00
|
|
|
if (IS_ERR(data->cdev)) {
|
|
|
|
ret = PTR_ERR(data->cdev);
|
2014-12-11 14:11:40 -07:00
|
|
|
if (ret != -EPROBE_DEFER)
|
|
|
|
dev_err(&pdev->dev,
|
|
|
|
"failed to register cpufreq cooling device: %d\n",
|
|
|
|
ret);
|
2013-06-24 00:30:44 -06:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2014-11-08 12:35:54 -07:00
|
|
|
data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
|
|
|
|
if (IS_ERR(data->thermal_clk)) {
|
|
|
|
ret = PTR_ERR(data->thermal_clk);
|
|
|
|
if (ret != -EPROBE_DEFER)
|
|
|
|
dev_err(&pdev->dev,
|
|
|
|
"failed to get thermal clk: %d\n", ret);
|
|
|
|
cpufreq_cooling_unregister(data->cdev);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Thermal sensor needs clk on to get correct value, normally
|
|
|
|
* we should enable its clk before taking measurement and disable
|
|
|
|
* clk after measurement is done, but if alarm function is enabled,
|
|
|
|
* hardware will auto measure the temperature periodically, so we
|
|
|
|
* need to keep the clk always on for alarm function.
|
|
|
|
*/
|
|
|
|
ret = clk_prepare_enable(data->thermal_clk);
|
|
|
|
if (ret) {
|
|
|
|
dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
|
|
|
|
cpufreq_cooling_unregister(data->cdev);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2013-06-24 00:30:44 -06:00
|
|
|
data->tz = thermal_zone_device_register("imx_thermal_zone",
|
2013-08-01 10:33:11 -06:00
|
|
|
IMX_TRIP_NUM,
|
|
|
|
BIT(IMX_TRIP_PASSIVE), data,
|
2013-06-24 00:30:44 -06:00
|
|
|
&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);
|
2014-11-08 12:35:54 -07:00
|
|
|
clk_disable_unprepare(data->thermal_clk);
|
2013-06-24 00:30:44 -06:00
|
|
|
cpufreq_cooling_unregister(data->cdev);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2013-08-01 10:33:12 -06:00
|
|
|
/* Enable measurements at ~ 10 Hz */
|
|
|
|
regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
|
|
|
|
measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
|
|
|
|
regmap_write(map, TEMPSENSE1 + REG_SET, measure_freq);
|
|
|
|
imx_set_alarm_temp(data, data->temp_passive);
|
2014-08-06 01:12:09 -06:00
|
|
|
|
|
|
|
if (data->socdata->version == TEMPMON_IMX6SX)
|
|
|
|
imx_set_panic_temp(data, data->temp_critical);
|
|
|
|
|
2013-08-01 10:33:12 -06:00
|
|
|
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
|
|
|
|
regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
|
|
|
|
|
|
|
|
data->irq_enabled = true;
|
2013-06-24 00:30:44 -06:00
|
|
|
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);
|
2013-08-01 10:33:12 -06:00
|
|
|
struct regmap *map = data->tempmon;
|
|
|
|
|
|
|
|
/* Disable measurements */
|
|
|
|
regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
|
2013-12-23 13:49:22 -07:00
|
|
|
if (!IS_ERR(data->thermal_clk))
|
|
|
|
clk_disable_unprepare(data->thermal_clk);
|
2013-06-24 00:30:44 -06:00
|
|
|
|
|
|
|
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;
|
|
|
|
|
2013-12-24 07:43:24 -07:00
|
|
|
/*
|
|
|
|
* Need to disable thermal sensor, otherwise, when thermal core
|
|
|
|
* try to get temperature before thermal sensor resume, a wrong
|
|
|
|
* temperature will be read as the thermal sensor is powered
|
|
|
|
* down.
|
|
|
|
*/
|
|
|
|
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
|
|
|
|
regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
|
|
|
|
data->mode = THERMAL_DEVICE_DISABLED;
|
2015-01-06 03:50:22 -07:00
|
|
|
clk_disable_unprepare(data->thermal_clk);
|
2013-06-24 00:30:44 -06:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int imx_thermal_resume(struct device *dev)
|
|
|
|
{
|
2013-12-24 07:43:24 -07:00
|
|
|
struct imx_thermal_data *data = dev_get_drvdata(dev);
|
|
|
|
struct regmap *map = data->tempmon;
|
|
|
|
|
2015-01-06 03:50:22 -07:00
|
|
|
clk_prepare_enable(data->thermal_clk);
|
2013-12-24 07:43:24 -07:00
|
|
|
/* Enabled thermal sensor after resume */
|
|
|
|
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
|
|
|
|
regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
|
|
|
|
data->mode = THERMAL_DEVICE_ENABLED;
|
|
|
|
|
2013-06-24 00:30:44 -06:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
|
|
|
|
imx_thermal_suspend, imx_thermal_resume);
|
|
|
|
|
|
|
|
static struct platform_driver imx_thermal = {
|
|
|
|
.driver = {
|
|
|
|
.name = "imx_thermal",
|
|
|
|
.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");
|