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/*
* 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/clk.h>
#include <linux/cpu_cooling.h>
#include <linux/cpufreq.h>
#include <linux/delay.h>
#include <linux/device.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/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_ALARM_VALUE_SHIFT 20
#define TEMPSENSE0_ALARM_VALUE_MASK (0xfff << TEMPSENSE0_ALARM_VALUE_SHIFT)
#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
#define IMX_POLLING_DELAY 2000 /* millisecond */
#define IMX_PASSIVE_DELAY 1000
#define FACTOR0 10000000
#define FACTOR1 15976
#define FACTOR2 4297157
struct imx_thermal_data {
struct thermal_zone_device *tz;
struct thermal_cooling_device *cdev;
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;
};
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;
alarm_value = (data->c2 - alarm_temp) / data->c1;
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_ALARM_VALUE_MASK);
regmap_write(map, TEMPSENSE0 + REG_SET, alarm_value <<
TEMPSENSE0_ALARM_VALUE_SHIFT);
}
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;
bool wait;
u32 val;
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;
}
/*
* According to the temp sensor designers, it may require up to ~17us
* to complete a measurement.
*/
if (wait)
usleep_range(20, 50);
regmap_read(map, TEMPSENSE0, &val);
if (data->mode != THERMAL_DEVICE_ENABLED) {
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 - n_meas * data->c1;
/* Update alarm value to next higher trip point */
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);
}
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;
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, 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);
}
} else {
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
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
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