blob: fa8151882f8711ae9b1b8356a84c22a38e3e5061 [file] [log] [blame]
/*
* Copyright 2013-2016 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/busfreq-imx.h>
#include <linux/clk.h>
#include <linux/cpu_cooling.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/device_cooling.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.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 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)
/* i.MX6 specific */
#define IMX6_TEMPSENSE0 0X180
#define IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT 20
#define IMX6_TEMPSENSE0_ALARM_VALUE_MASK (0xfff << 20)
#define IMX6_TEMPSENSE0_TEMP_CNT_SHIFT 8
#define IMX6_TEMPSENSE0_TEMP_CNT_MASK (0xfff << 8)
#define IMX6_TEMPSENSE0_FINISHED (1 << 2)
#define IMX6_TEMPSENSE0_MEASURE_TEMP (1 << 1)
#define IMX6_TEMPSENSE0_POWER_DOWN (1 << 0)
#define IMX6_TEMPSENSE1 0X190
#define IMX6_TEMPSENSE1_MEASURE_FREQ 0xffff
#define IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT 0
/* 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
/* i.MX7D specific */
#define IMX7_ANADIG_DIGPROG 0x800
#define IMX7_TEMPSENSE0 0X300
#define IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT 18
#define IMX7_TEMPSENSE0_PANIC_ALARM_MASK (0x1ff << 18)
#define IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT 9
#define IMX7_TEMPSENSE0_HIGH_ALARM_MASK (0x1ff << 9)
#define IMX7_TEMPSENSE0_LOW_ALARM_SHIFT 0
#define IMX7_TEMPSENSE0_LOW_ALARM_MASK 0x1ff
#define IMX7_TEMPSENSE1 0X310
#define IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT 16
#define IMX7_TEMPSENSE1_MEASURE_FREQ_MASK (0xffff << 16)
#define IMX7_TEMPSENSE1_FINISHED (1 << 11)
#define IMX7_TEMPSENSE1_MEASURE_TEMP (1 << 10)
#define IMX7_TEMPSENSE1_POWER_DOWN (1 << 9)
#define IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT 0
#define IMX7_TEMPSENSE1_TEMP_VALUE_MASK 0x1ff
#define IMX6_OCOTP_ANA1 0x04e0
#define IMX7_OCOTP_ANA1 0x04f0
/* 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_TEMP_PASSIVE_COOL_DELTA 10000
#define IMX_POLLING_DELAY 2000 /* millisecond */
#define IMX_PASSIVE_DELAY 1000
#define FACTOR0 10000000
#define FACTOR1 15423
#define FACTOR2 4148468
#define OFFSET 3580661
#define TEMPMON_IMX6Q 1
#define TEMPMON_IMX6SX 2
#define TEMPMON_IMX7 3
/* the register offsets and bitfields may change across
* i.MX SOCs, use below struct as a description of the
* register.
*/
struct thermal_soc_data {
u32 sensor_ctrl; /* tempmon sensor basic control */
u32 power_down_mask;
u32 measure_temp_mask;
u32 measure_freq_ctrl;
u32 measure_freq_mask;
u32 measure_freq_shift;
u32 temp_data;
u32 temp_value_mask;
u32 temp_value_shift;
u32 temp_valid_mask;
u32 panic_alarm_ctrl;
u32 panic_alarm_mask;
u32 panic_alarm_shift;
u32 high_alarm_ctrl;
u32 high_alarm_mask;
u32 high_alarm_shift;
u32 low_alarm_ctrl;
u32 low_alarm_mask;
u32 low_alarm_shift;
u32 version;
};
static struct thermal_soc_data thermal_imx6q_data = {
.version = TEMPMON_IMX6Q,
.sensor_ctrl = IMX6_TEMPSENSE0,
.power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN,
.measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP,
.measure_freq_ctrl = IMX6_TEMPSENSE1,
.measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT,
.measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ,
.temp_data = IMX6_TEMPSENSE0,
.temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK,
.temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT,
.temp_valid_mask = IMX6_TEMPSENSE0_FINISHED,
.high_alarm_ctrl = IMX6_TEMPSENSE0,
.high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK,
.high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT,
};
static struct thermal_soc_data thermal_imx6sx_data = {
.version = TEMPMON_IMX6SX,
.sensor_ctrl = IMX6_TEMPSENSE0,
.power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN,
.measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP,
.measure_freq_ctrl = IMX6_TEMPSENSE1,
.measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT,
.measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ,
.temp_data = IMX6_TEMPSENSE0,
.temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK,
.temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT,
.temp_valid_mask = IMX6_TEMPSENSE0_FINISHED,
.high_alarm_ctrl = IMX6_TEMPSENSE0,
.high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK,
.high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT,
.panic_alarm_ctrl = TEMPSENSE2,
.panic_alarm_mask = TEMPSENSE2_PANIC_VALUE_MASK,
.panic_alarm_shift = TEMPSENSE2_PANIC_VALUE_SHIFT,
};
static struct thermal_soc_data thermal_imx7d_data = {
.version = TEMPMON_IMX7,
.sensor_ctrl = IMX7_TEMPSENSE1,
.power_down_mask = IMX7_TEMPSENSE1_POWER_DOWN,
.measure_temp_mask = IMX7_TEMPSENSE1_MEASURE_TEMP,
.measure_freq_ctrl = IMX7_TEMPSENSE1,
.measure_freq_shift = IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT,
.measure_freq_mask = IMX7_TEMPSENSE1_MEASURE_FREQ_MASK,
.temp_data = IMX7_TEMPSENSE1,
.temp_value_mask = IMX7_TEMPSENSE1_TEMP_VALUE_MASK,
.temp_value_shift = IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT,
.temp_valid_mask = IMX7_TEMPSENSE1_FINISHED,
.panic_alarm_ctrl = IMX7_TEMPSENSE1,
.panic_alarm_mask = IMX7_TEMPSENSE0_PANIC_ALARM_MASK,
.panic_alarm_shift = IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT,
.high_alarm_ctrl = IMX7_TEMPSENSE0,
.high_alarm_mask = IMX7_TEMPSENSE0_HIGH_ALARM_MASK,
.high_alarm_shift = IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT,
.low_alarm_ctrl = IMX7_TEMPSENSE0,
.low_alarm_mask = IMX7_TEMPSENSE0_LOW_ALARM_MASK,
.low_alarm_shift = IMX7_TEMPSENSE0_LOW_ALARM_SHIFT,
};
struct imx_thermal_data {
struct thermal_zone_device *tz;
struct thermal_cooling_device *cdev[2];
enum thermal_device_mode mode;
struct regmap *tempmon;
u32 c1, c2; /* See formula in imx_get_sensor_data() */
unsigned long temp_passive;
unsigned long temp_critical;
unsigned long alarm_temp;
unsigned long last_temp;
bool irq_enabled;
int irq;
struct clk *thermal_clk;
struct mutex mutex;
const struct thermal_soc_data *socdata;
};
static struct imx_thermal_data *imx_thermal_data;
static int skip_finish_check;
static void imx_set_panic_temp(struct imx_thermal_data *data,
signed long panic_temp)
{
const struct thermal_soc_data *soc_data = data->socdata;
struct regmap *map = data->tempmon;
int critical_value;
if (data->socdata->version == TEMPMON_IMX7)
critical_value = panic_temp / 1000 + data->c1 - 25;
else
critical_value = (data->c2 - panic_temp) / data->c1;
regmap_write(map, soc_data->panic_alarm_ctrl + REG_CLR,
soc_data->panic_alarm_mask);
regmap_write(map, soc_data->panic_alarm_ctrl + REG_SET,
critical_value << soc_data->panic_alarm_shift);
}
static void imx_set_alarm_temp(struct imx_thermal_data *data,
signed long alarm_temp)
{
const struct thermal_soc_data *soc_data = data->socdata;
struct regmap *map = data->tempmon;
int alarm_value;
data->alarm_temp = alarm_temp;
if (data->socdata->version == TEMPMON_IMX7)
alarm_value = alarm_temp / 1000 + data->c1 - 25;
else
alarm_value = (data->c2 - alarm_temp) / data->c1;
regmap_write(map, soc_data->high_alarm_ctrl + REG_CLR,
soc_data->high_alarm_mask);
regmap_write(map, soc_data->high_alarm_ctrl + REG_SET,
alarm_value << soc_data->high_alarm_shift);
}
static int imx_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
{
struct imx_thermal_data *data = tz->devdata;
const struct thermal_soc_data *soc_data = data->socdata;
struct regmap *map = data->tempmon;
unsigned int n_meas;
bool wait;
u32 val;
mutex_lock(&data->mutex);
if (data->mode == THERMAL_DEVICE_ENABLED) {
/* Check if a measurement is currently in progress */
regmap_read(map, soc_data->temp_data, &val);
wait = !(val & soc_data->temp_valid_mask);
} 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.
*/
clk_prepare_enable(data->thermal_clk);
regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
soc_data->power_down_mask);
regmap_write(map, soc_data->sensor_ctrl + REG_SET,
soc_data->measure_temp_mask);
wait = true;
}
/*
* According to the temp sensor designers, it may require up to ~17us
* to complete a measurement.
*/
if (wait) {
/*
* On i.MX7 TO1.0, the finish bit can only keep 1us after
* the measured data available. It is hard for software to
* polling this bit. So wait for 20ms to make sure the
* measured data is valid.
*/
if (data->socdata->version == TEMPMON_IMX7 && skip_finish_check)
msleep(20);
else
usleep_range(20, 50);
regmap_read(map, soc_data->temp_data, &val);
}
if (data->mode != THERMAL_DEVICE_ENABLED) {
regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
soc_data->measure_temp_mask);
regmap_write(map, soc_data->sensor_ctrl + REG_SET,
soc_data->power_down_mask);
clk_disable_unprepare(data->thermal_clk);
}
if (!skip_finish_check && ((val & soc_data->temp_valid_mask) == 0)) {
dev_dbg(&tz->device, "temp measurement never finished\n");
mutex_unlock(&data->mutex);
return -EAGAIN;
}
n_meas = (val & soc_data->temp_value_mask) >> soc_data->temp_value_shift;
/* See imx_get_sensor_data() for formula derivation */
*temp = data->c2 - n_meas * data->c1;
if (data->socdata->version == TEMPMON_IMX7)
*temp = (n_meas - data->c1 + 25) * 1000;
else
*temp = data->c2 - n_meas * data->c1;
/* 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);
}
}
if (*temp != data->last_temp) {
dev_dbg(&tz->device, "millicelsius: %ld\n", *temp);
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);
}
mutex_unlock(&data->mutex);
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;
const struct thermal_soc_data *soc_data = data->socdata;
struct regmap *map = data->tempmon;
if (mode == THERMAL_DEVICE_ENABLED) {
tz->polling_delay = IMX_POLLING_DELAY;
tz->passive_delay = IMX_PASSIVE_DELAY;
regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
soc_data->power_down_mask);
regmap_write(map, soc_data->sensor_ctrl + REG_SET,
soc_data->measure_temp_mask);
if (!data->irq_enabled) {
data->irq_enabled = true;
enable_irq(data->irq);
}
} else {
regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
soc_data->measure_temp_mask);
regmap_write(map, soc_data->sensor_ctrl + REG_SET,
soc_data->power_down_mask);
tz->polling_delay = 0;
tz->passive_delay = 0;
if (data->irq_enabled) {
disable_irq(data->irq);
data->irq_enabled = false;
}
}
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)
{
struct imx_thermal_data *data = tz->devdata;
*temp = data->temp_critical;
return 0;
}
static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
unsigned long *temp)
{
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) {
data->temp_critical = temp;
if (data->socdata->version == TEMPMON_IMX6SX)
imx_set_panic_temp(data, temp);
}
if (trip == IMX_TRIP_PASSIVE) {
if (temp > IMX_TEMP_PASSIVE)
return -EINVAL;
data->temp_passive = temp;
imx_set_alarm_temp(data, temp);
}
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 int imx_get_trend(struct thermal_zone_device *tz,
int trip, enum thermal_trend *trend)
{
int ret;
unsigned long trip_temp;
ret = imx_get_trip_temp(tz, trip, &trip_temp);
if (ret < 0)
return ret;
if (tz->temperature >= (trip_temp - IMX_TEMP_PASSIVE_COOL_DELTA))
*trend = THERMAL_TREND_RAISE_FULL;
else
*trend = THERMAL_TREND_DROP_FULL;
return 0;
}
static 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,
.set_trip_temp = imx_set_trip_temp,
.get_trend = imx_get_trend,
};
static inline void imx6_calibrate_data(struct imx_thermal_data *data, u32 val)
{
int t1, t2, n1, n2;
u64 temp64;
/*
* Sensor data layout:
* [31:20] - sensor value @ 25C
* [19:8] - sensor value of hot
* [7:0] - hot temperature value
* Use universal formula now and only need sensor value @ 25C
* slope = 0.4297157 - (0.0015976 * 25C fuse)
*/
n1 = val >> 20;
n2 = (val & 0xfff00) >> 8;
t2 = val & 0xff;
t1 = 25; /* t1 always 25C */
/*
* Derived from linear interpolation:
* slope = 0.4297157 - (0.0015976 * 25C fuse)
* slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0
* offset = OFFSET / 1000000
* (Nmeas - n1) / (Tmeas - t1) = slope
* 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...
* Tmeas = (Nmeas - n1) / slope + t1 + offset
* milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1 + OFFSET / 1000
* milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1 + OFFSET /1000
* Let constant c1 = (-1000 / slope)
* milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1 + OFFSET / 1000
* Let constant c2 = n1 *c1 + 1000 * t1 + OFFSET / 1000
* milli_Tmeas = c2 - Nmeas * c1
*/
temp64 = FACTOR0;
temp64 *= 1000;
do_div(temp64, FACTOR1 * n1 - FACTOR2);
data->c1 = temp64;
temp64 = OFFSET;
do_div(temp64, 1000);
data->c2 = n1 * data->c1 + 1000 * t1 + temp64;
}
/*
* On i.MX7, we only use the calibration data at 25C to get the temp,
* Tmeas = ( Nmeas - n1) + 25; n1 is the fuse value for 25C.
*/
static inline void imx7_calibrate_data(struct imx_thermal_data *data, u32 val)
{
data->c1 = (val >> 9) & 0x1ff;
}
static int imx_get_sensor_data(struct platform_device *pdev)
{
struct imx_thermal_data *data = platform_get_drvdata(pdev);
struct regmap *map;
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;
}
if (data->socdata->version == TEMPMON_IMX7)
ret = regmap_read(map, IMX7_OCOTP_ANA1, &val);
else
ret = regmap_read(map, IMX6_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;
}
if (data->socdata->version == TEMPMON_IMX7)
imx7_calibrate_data(data, val);
else
imx6_calibrate_data(data, val);
/*
* Set the default passive cooling trip point to IMX_TEMP_PASSIVE.
* Can be changed from userspace.
*/
data->temp_passive = IMX_TEMP_PASSIVE;
/*
* Set the default critical trip point to 20 C higher
* than passive trip point. Can be changed from userspace.
*/
data->temp_critical = IMX_TEMP_PASSIVE + 20 * 1000;
return 0;
}
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;
}
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, },
{ .compatible = "fsl,imx7d-tempmon", .data = &thermal_imx7d_data, },
{ /* end */ }
};
MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
static int thermal_notifier_event(struct notifier_block *this,
unsigned long event, void *ptr)
{
const struct thermal_soc_data *soc_data = imx_thermal_data->socdata;
struct regmap *map = imx_thermal_data->tempmon;
mutex_lock(&imx_thermal_data->mutex);
switch (event) {
/*
* In low_bus_freq_mode, the thermal sensor auto measurement
* can be disabled to low the power consumption.
*/
case LOW_BUSFREQ_ENTER:
regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
soc_data->measure_temp_mask);
regmap_write(map, soc_data->sensor_ctrl + REG_SET,
soc_data->power_down_mask);
imx_thermal_data->mode = THERMAL_DEVICE_DISABLED;
disable_irq(imx_thermal_data->irq);
clk_disable_unprepare(imx_thermal_data->thermal_clk);
break;
/* Enabled thermal auto measurement when exiting low_bus_freq_mode */
case LOW_BUSFREQ_EXIT:
clk_prepare_enable(imx_thermal_data->thermal_clk);
regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
soc_data->power_down_mask);
regmap_write(map, soc_data->sensor_ctrl + REG_SET,
soc_data->measure_temp_mask);
imx_thermal_data->mode = THERMAL_DEVICE_ENABLED;
enable_irq(imx_thermal_data->irq);
break;
default:
break;
}
mutex_unlock(&imx_thermal_data->mutex);
return NOTIFY_OK;
}
static struct notifier_block thermal_notifier = {
.notifier_call = thermal_notifier_event,
};
static int imx_thermal_probe(struct platform_device *pdev)
{
const struct of_device_id *of_id =
of_match_device(of_imx_thermal_match, &pdev->dev);
struct imx_thermal_data *data;
struct regmap *map;
int measure_freq;
int ret, revision;
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
imx_thermal_data = data;
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;
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);
}
data->irq = platform_get_irq(pdev, 0);
if (data->irq < 0)
return data->irq;
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;
}
/*
* for i.MX7D TO1.0, finish bit is not available, check the
* SOC revision to skip checking the finish bit status.
*/
regmap_read(map, IMX7_ANADIG_DIGPROG, &revision);
if ((revision & 0xff) == 0x10)
skip_finish_check = 1;
/* Make sure sensor is in known good state for measurements */
regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
data->socdata->power_down_mask);
regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
data->socdata->measure_temp_mask);
regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,
data->socdata->measure_freq_mask);
if (data->socdata->version != TEMPMON_IMX7)
regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF);
regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
data->socdata->power_down_mask);
data->cdev[0] = cpufreq_cooling_register(cpu_present_mask);
if (IS_ERR(data->cdev[0])) {
ret = PTR_ERR(data->cdev[0]);
if (ret != -EPROBE_DEFER)
dev_err(&pdev->dev,
"failed to register cpufreq cooling device: %d\n",
ret);
return ret;
}
data->cdev[1] = devfreq_cooling_register();
if (IS_ERR(data->cdev[1])) {
ret = PTR_ERR(data->cdev[1]);
if (ret != -EPROBE_DEFER) {
dev_err(&pdev->dev,
"failed to register cpufreq cooling device: %d\n",
ret);
cpufreq_cooling_unregister(data->cdev[0]);
}
return ret;
}
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[0]);
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[0]);
devfreq_cooling_unregister(data->cdev[1]);
return ret;
}
mutex_init(&data->mutex);
data->tz = thermal_zone_device_register("imx_thermal_zone",
IMX_TRIP_NUM,
(1 << IMX_TRIP_NUM) - 1, 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);
clk_disable_unprepare(data->thermal_clk);
cpufreq_cooling_unregister(data->cdev[0]);
devfreq_cooling_unregister(data->cdev[1]);
return ret;
}
/* Enable measurements at ~ 10 Hz */
regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,
data->socdata->measure_freq_mask);
measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
regmap_write(map, data->socdata->measure_freq_ctrl + REG_SET,
measure_freq << data->socdata->measure_freq_shift);
imx_set_alarm_temp(data, data->temp_passive);
if (data->socdata->version == TEMPMON_IMX6SX)
imx_set_panic_temp(data, data->temp_critical);
regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
data->socdata->power_down_mask);
regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
data->socdata->measure_temp_mask);
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;
}
data->irq_enabled = true;
data->mode = THERMAL_DEVICE_ENABLED;
/* register the busfreq notifier called in low bus freq */
if (data->socdata->version != TEMPMON_IMX7)
register_busfreq_notifier(&thermal_notifier);
return 0;
}
static int imx_thermal_remove(struct platform_device *pdev)
{
struct imx_thermal_data *data = platform_get_drvdata(pdev);
struct regmap *map = data->tempmon;
/* Disable measurements */
regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
data->socdata->power_down_mask);
if (!IS_ERR(data->thermal_clk))
clk_disable_unprepare(data->thermal_clk);
/* unregister the busfreq notifier called in low bus freq */
if (data->socdata->version != TEMPMON_IMX7)
unregister_busfreq_notifier(&thermal_notifier);
thermal_zone_device_unregister(data->tz);
cpufreq_cooling_unregister(data->cdev[0]);
devfreq_cooling_unregister(data->cdev[1]);
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;
/*
* 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, data->socdata->sensor_ctrl + REG_CLR,
data->socdata->measure_temp_mask);
regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
data->socdata->power_down_mask);
data->mode = THERMAL_DEVICE_DISABLED;
clk_disable_unprepare(data->thermal_clk);
return 0;
}
static int imx_thermal_resume(struct device *dev)
{
struct imx_thermal_data *data = dev_get_drvdata(dev);
struct regmap *map = data->tempmon;
clk_prepare_enable(data->thermal_clk);
/* Enabled thermal sensor after resume */
regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
data->socdata->power_down_mask);
regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
data->socdata->measure_temp_mask);
data->mode = THERMAL_DEVICE_ENABLED;
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");