forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
899 lines
24 KiB
899 lines
24 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
// |
|
// Copyright 2013 Freescale Semiconductor, Inc. |
|
|
|
#include <linux/clk.h> |
|
#include <linux/cpufreq.h> |
|
#include <linux/cpu_cooling.h> |
|
#include <linux/delay.h> |
|
#include <linux/interrupt.h> |
|
#include <linux/io.h> |
|
#include <linux/mfd/syscon.h> |
|
#include <linux/module.h> |
|
#include <linux/of.h> |
|
#include <linux/of_device.h> |
|
#include <linux/regmap.h> |
|
#include <linux/thermal.h> |
|
#include <linux/nvmem-consumer.h> |
|
|
|
#define REG_SET 0x4 |
|
#define REG_CLR 0x8 |
|
#define REG_TOG 0xc |
|
|
|
/* i.MX6 specific */ |
|
#define IMX6_MISC0 0x0150 |
|
#define IMX6_MISC0_REFTOP_SELBIASOFF (1 << 3) |
|
#define IMX6_MISC1 0x0160 |
|
#define IMX6_MISC1_IRQ_TEMPHIGH (1 << 29) |
|
/* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */ |
|
#define IMX6_MISC1_IRQ_TEMPLOW (1 << 28) |
|
#define IMX6_MISC1_IRQ_TEMPPANIC (1 << 27) |
|
|
|
#define IMX6_TEMPSENSE0 0x0180 |
|
#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 0x0190 |
|
#define IMX6_TEMPSENSE1_MEASURE_FREQ 0xffff |
|
#define IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT 0 |
|
|
|
#define OCOTP_MEM0 0x0480 |
|
#define OCOTP_ANA1 0x04e0 |
|
|
|
/* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */ |
|
#define IMX6_TEMPSENSE2 0x0290 |
|
#define IMX6_TEMPSENSE2_LOW_VALUE_SHIFT 0 |
|
#define IMX6_TEMPSENSE2_LOW_VALUE_MASK 0xfff |
|
#define IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT 16 |
|
#define IMX6_TEMPSENSE2_PANIC_VALUE_MASK 0xfff0000 |
|
|
|
/* i.MX7 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 |
|
|
|
/* 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, |
|
}; |
|
|
|
#define IMX_POLLING_DELAY 2000 /* millisecond */ |
|
#define IMX_PASSIVE_DELAY 1000 |
|
|
|
#define TEMPMON_IMX6Q 1 |
|
#define TEMPMON_IMX6SX 2 |
|
#define TEMPMON_IMX7D 3 |
|
|
|
struct thermal_soc_data { |
|
u32 version; |
|
|
|
u32 sensor_ctrl; |
|
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; |
|
}; |
|
|
|
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 = IMX6_TEMPSENSE2, |
|
.panic_alarm_mask = IMX6_TEMPSENSE2_PANIC_VALUE_MASK, |
|
.panic_alarm_shift = IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT, |
|
|
|
.low_alarm_ctrl = IMX6_TEMPSENSE2, |
|
.low_alarm_mask = IMX6_TEMPSENSE2_LOW_VALUE_MASK, |
|
.low_alarm_shift = IMX6_TEMPSENSE2_LOW_VALUE_SHIFT, |
|
}; |
|
|
|
static struct thermal_soc_data thermal_imx7d_data = { |
|
.version = TEMPMON_IMX7D, |
|
|
|
.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 cpufreq_policy *policy; |
|
struct thermal_zone_device *tz; |
|
struct thermal_cooling_device *cdev; |
|
struct regmap *tempmon; |
|
u32 c1, c2; /* See formula in imx_init_calib() */ |
|
int temp_passive; |
|
int temp_critical; |
|
int temp_max; |
|
int alarm_temp; |
|
int last_temp; |
|
bool irq_enabled; |
|
int irq; |
|
struct clk *thermal_clk; |
|
const struct thermal_soc_data *socdata; |
|
const char *temp_grade; |
|
}; |
|
|
|
static void imx_set_panic_temp(struct imx_thermal_data *data, |
|
int panic_temp) |
|
{ |
|
const struct thermal_soc_data *soc_data = data->socdata; |
|
struct regmap *map = data->tempmon; |
|
int critical_value; |
|
|
|
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, |
|
int alarm_temp) |
|
{ |
|
struct regmap *map = data->tempmon; |
|
const struct thermal_soc_data *soc_data = data->socdata; |
|
int alarm_value; |
|
|
|
data->alarm_temp = alarm_temp; |
|
|
|
if (data->socdata->version == TEMPMON_IMX7D) |
|
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, int *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, run_measurement; |
|
u32 val; |
|
|
|
run_measurement = !data->irq_enabled; |
|
if (!run_measurement) { |
|
/* 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. |
|
*/ |
|
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) |
|
usleep_range(20, 50); |
|
|
|
regmap_read(map, soc_data->temp_data, &val); |
|
|
|
if (run_measurement) { |
|
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); |
|
} |
|
|
|
if ((val & soc_data->temp_valid_mask) == 0) { |
|
dev_dbg(&tz->device, "temp measurement never finished\n"); |
|
return -EAGAIN; |
|
} |
|
|
|
n_meas = (val & soc_data->temp_value_mask) |
|
>> soc_data->temp_value_shift; |
|
|
|
/* See imx_init_calib() for formula derivation */ |
|
if (data->socdata->version == TEMPMON_IMX7D) |
|
*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 < %d\n", |
|
data->alarm_temp / 1000); |
|
} |
|
} |
|
|
|
if (*temp != data->last_temp) { |
|
dev_dbg(&tz->device, "millicelsius: %d\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_change_mode(struct thermal_zone_device *tz, |
|
enum thermal_device_mode mode) |
|
{ |
|
struct imx_thermal_data *data = tz->devdata; |
|
struct regmap *map = data->tempmon; |
|
const struct thermal_soc_data *soc_data = data->socdata; |
|
|
|
if (mode == THERMAL_DEVICE_ENABLED) { |
|
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); |
|
|
|
if (data->irq_enabled) { |
|
disable_irq(data->irq); |
|
data->irq_enabled = false; |
|
} |
|
} |
|
|
|
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, int *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, |
|
int *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, |
|
int temp) |
|
{ |
|
struct imx_thermal_data *data = tz->devdata; |
|
|
|
/* do not allow changing critical threshold */ |
|
if (trip == IMX_TRIP_CRITICAL) |
|
return -EPERM; |
|
|
|
/* do not allow passive to be set higher than critical */ |
|
if (temp < 0 || temp > data->temp_critical) |
|
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, |
|
THERMAL_WEIGHT_DEFAULT); |
|
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 struct thermal_zone_device_ops imx_tz_ops = { |
|
.bind = imx_bind, |
|
.unbind = imx_unbind, |
|
.get_temp = imx_get_temp, |
|
.change_mode = imx_change_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, |
|
}; |
|
|
|
static int imx_init_calib(struct platform_device *pdev, u32 ocotp_ana1) |
|
{ |
|
struct imx_thermal_data *data = platform_get_drvdata(pdev); |
|
int n1; |
|
u64 temp64; |
|
|
|
if (ocotp_ana1 == 0 || ocotp_ana1 == ~0) { |
|
dev_err(&pdev->dev, "invalid sensor calibration data\n"); |
|
return -EINVAL; |
|
} |
|
|
|
/* |
|
* On i.MX7D, we only use the calibration data at 25C to get the temp, |
|
* Tmeas = ( Nmeas - n1) + 25; n1 is the fuse value for 25C. |
|
*/ |
|
if (data->socdata->version == TEMPMON_IMX7D) { |
|
data->c1 = (ocotp_ana1 >> 9) & 0x1ff; |
|
return 0; |
|
} |
|
|
|
/* |
|
* The sensor is calibrated at 25 °C (aka T1) and the value measured |
|
* (aka N1) at this temperature is provided in bits [31:20] in the |
|
* i.MX's OCOTP value ANA1. |
|
* To find the actual temperature T, the following formula has to be used |
|
* when reading value n from the sensor: |
|
* |
|
* T = T1 + (N - N1) / (0.4148468 - 0.0015423 * N1) °C + 3.580661 °C |
|
* = [T1' - N1 / (0.4148468 - 0.0015423 * N1) °C] + N / (0.4148468 - 0.0015423 * N1) °C |
|
* = [T1' + N1 / (0.0015423 * N1 - 0.4148468) °C] - N / (0.0015423 * N1 - 0.4148468) °C |
|
* = c2 - c1 * N |
|
* |
|
* with |
|
* |
|
* T1' = 28.580661 °C |
|
* c1 = 1 / (0.0015423 * N1 - 0.4297157) °C |
|
* c2 = T1' + N1 / (0.0015423 * N1 - 0.4148468) °C |
|
* = T1' + N1 * c1 |
|
*/ |
|
n1 = ocotp_ana1 >> 20; |
|
|
|
temp64 = 10000000; /* use 10^7 as fixed point constant for values in formula */ |
|
temp64 *= 1000; /* to get result in °mC */ |
|
do_div(temp64, 15423 * n1 - 4148468); |
|
data->c1 = temp64; |
|
data->c2 = n1 * data->c1 + 28581; |
|
|
|
return 0; |
|
} |
|
|
|
static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0) |
|
{ |
|
struct imx_thermal_data *data = platform_get_drvdata(pdev); |
|
|
|
/* The maximum die temp is specified by the Temperature Grade */ |
|
switch ((ocotp_mem0 >> 6) & 0x3) { |
|
case 0: /* Commercial (0 to 95 °C) */ |
|
data->temp_grade = "Commercial"; |
|
data->temp_max = 95000; |
|
break; |
|
case 1: /* Extended Commercial (-20 °C to 105 °C) */ |
|
data->temp_grade = "Extended Commercial"; |
|
data->temp_max = 105000; |
|
break; |
|
case 2: /* Industrial (-40 °C to 105 °C) */ |
|
data->temp_grade = "Industrial"; |
|
data->temp_max = 105000; |
|
break; |
|
case 3: /* Automotive (-40 °C to 125 °C) */ |
|
data->temp_grade = "Automotive"; |
|
data->temp_max = 125000; |
|
break; |
|
} |
|
|
|
/* |
|
* Set the critical trip point at 5 °C under max |
|
* Set the passive trip point at 10 °C under max (changeable via sysfs) |
|
*/ |
|
data->temp_critical = data->temp_max - (1000 * 5); |
|
data->temp_passive = data->temp_max - (1000 * 10); |
|
} |
|
|
|
static int imx_init_from_tempmon_data(struct platform_device *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; |
|
} |
|
|
|
ret = regmap_read(map, OCOTP_ANA1, &val); |
|
if (ret) { |
|
dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); |
|
return ret; |
|
} |
|
ret = imx_init_calib(pdev, val); |
|
if (ret) |
|
return ret; |
|
|
|
ret = regmap_read(map, OCOTP_MEM0, &val); |
|
if (ret) { |
|
dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); |
|
return ret; |
|
} |
|
imx_init_temp_grade(pdev, val); |
|
|
|
return 0; |
|
} |
|
|
|
static int imx_init_from_nvmem_cells(struct platform_device *pdev) |
|
{ |
|
int ret; |
|
u32 val; |
|
|
|
ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val); |
|
if (ret) |
|
return ret; |
|
|
|
ret = imx_init_calib(pdev, val); |
|
if (ret) |
|
return ret; |
|
|
|
ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val); |
|
if (ret) |
|
return ret; |
|
imx_init_temp_grade(pdev, val); |
|
|
|
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 > %d\n", |
|
data->alarm_temp / 1000); |
|
|
|
thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED); |
|
|
|
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); |
|
|
|
#ifdef CONFIG_CPU_FREQ |
|
/* |
|
* Create cooling device in case no #cooling-cells property is available in |
|
* CPU node |
|
*/ |
|
static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data) |
|
{ |
|
struct device_node *np; |
|
int ret = 0; |
|
|
|
data->policy = cpufreq_cpu_get(0); |
|
if (!data->policy) { |
|
pr_debug("%s: CPUFreq policy not found\n", __func__); |
|
return -EPROBE_DEFER; |
|
} |
|
|
|
np = of_get_cpu_node(data->policy->cpu, NULL); |
|
|
|
if (!np || !of_find_property(np, "#cooling-cells", NULL)) { |
|
data->cdev = cpufreq_cooling_register(data->policy); |
|
if (IS_ERR(data->cdev)) { |
|
ret = PTR_ERR(data->cdev); |
|
cpufreq_cpu_put(data->policy); |
|
} |
|
} |
|
|
|
of_node_put(np); |
|
|
|
return ret; |
|
} |
|
|
|
static void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data) |
|
{ |
|
cpufreq_cooling_unregister(data->cdev); |
|
cpufreq_cpu_put(data->policy); |
|
} |
|
|
|
#else |
|
|
|
static inline int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data) |
|
{ |
|
} |
|
#endif |
|
|
|
static int imx_thermal_probe(struct platform_device *pdev) |
|
{ |
|
struct imx_thermal_data *data; |
|
struct regmap *map; |
|
int measure_freq; |
|
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; |
|
|
|
data->socdata = of_device_get_match_data(&pdev->dev); |
|
if (!data->socdata) { |
|
dev_err(&pdev->dev, "no device match found\n"); |
|
return -ENODEV; |
|
} |
|
|
|
/* make sure the IRQ flag is clear before enabling irq on i.MX6SX */ |
|
if (data->socdata->version == TEMPMON_IMX6SX) { |
|
regmap_write(map, IMX6_MISC1 + REG_CLR, |
|
IMX6_MISC1_IRQ_TEMPHIGH | IMX6_MISC1_IRQ_TEMPLOW |
|
| IMX6_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, data->socdata->low_alarm_ctrl + REG_SET, |
|
data->socdata->low_alarm_mask); |
|
} |
|
|
|
data->irq = platform_get_irq(pdev, 0); |
|
if (data->irq < 0) |
|
return data->irq; |
|
|
|
platform_set_drvdata(pdev, data); |
|
|
|
if (of_find_property(pdev->dev.of_node, "nvmem-cells", NULL)) { |
|
ret = imx_init_from_nvmem_cells(pdev); |
|
if (ret) |
|
return dev_err_probe(&pdev->dev, ret, |
|
"failed to init from nvmem\n"); |
|
} else { |
|
ret = imx_init_from_tempmon_data(pdev); |
|
if (ret) { |
|
dev_err(&pdev->dev, "failed to init from fsl,tempmon-data\n"); |
|
return ret; |
|
} |
|
} |
|
|
|
/* 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_IMX7D) |
|
regmap_write(map, IMX6_MISC0 + REG_SET, |
|
IMX6_MISC0_REFTOP_SELBIASOFF); |
|
regmap_write(map, data->socdata->sensor_ctrl + REG_SET, |
|
data->socdata->power_down_mask); |
|
|
|
ret = imx_thermal_register_legacy_cooling(data); |
|
if (ret) |
|
return dev_err_probe(&pdev->dev, ret, |
|
"failed to register cpufreq cooling device\n"); |
|
|
|
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); |
|
goto legacy_cleanup; |
|
} |
|
|
|
/* |
|
* 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); |
|
goto legacy_cleanup; |
|
} |
|
|
|
data->tz = thermal_zone_device_register("imx_thermal_zone", |
|
IMX_TRIP_NUM, |
|
BIT(IMX_TRIP_PASSIVE), 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); |
|
goto clk_disable; |
|
} |
|
|
|
dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC" |
|
" critical:%dC passive:%dC\n", data->temp_grade, |
|
data->temp_max / 1000, data->temp_critical / 1000, |
|
data->temp_passive / 1000); |
|
|
|
/* 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); |
|
|
|
data->irq_enabled = true; |
|
ret = thermal_zone_device_enable(data->tz); |
|
if (ret) |
|
goto thermal_zone_unregister; |
|
|
|
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); |
|
goto thermal_zone_unregister; |
|
} |
|
|
|
return 0; |
|
|
|
thermal_zone_unregister: |
|
thermal_zone_device_unregister(data->tz); |
|
clk_disable: |
|
clk_disable_unprepare(data->thermal_clk); |
|
legacy_cleanup: |
|
imx_thermal_unregister_legacy_cooling(data); |
|
|
|
return ret; |
|
} |
|
|
|
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); |
|
|
|
thermal_zone_device_unregister(data->tz); |
|
imx_thermal_unregister_legacy_cooling(data); |
|
|
|
return 0; |
|
} |
|
|
|
static int __maybe_unused imx_thermal_suspend(struct device *dev) |
|
{ |
|
struct imx_thermal_data *data = dev_get_drvdata(dev); |
|
int ret; |
|
|
|
/* |
|
* 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. This is done in change_mode() operation called from |
|
* thermal_zone_device_disable() |
|
*/ |
|
ret = thermal_zone_device_disable(data->tz); |
|
if (ret) |
|
return ret; |
|
clk_disable_unprepare(data->thermal_clk); |
|
|
|
return 0; |
|
} |
|
|
|
static int __maybe_unused imx_thermal_resume(struct device *dev) |
|
{ |
|
struct imx_thermal_data *data = dev_get_drvdata(dev); |
|
int ret; |
|
|
|
ret = clk_prepare_enable(data->thermal_clk); |
|
if (ret) |
|
return ret; |
|
/* Enabled thermal sensor after resume */ |
|
ret = thermal_zone_device_enable(data->tz); |
|
if (ret) |
|
return ret; |
|
|
|
return 0; |
|
} |
|
|
|
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");
|
|
|