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linux/drivers/thermal/samsung/exynos_tmu.c
Mateusz Majewski 5314b15437 thermal/drivers/exynos: Use set_trips ops 
Currently, each trip point defined in the device tree corresponds to a
single hardware interrupt. This commit instead switches to using two
hardware interrupts, whose values are set dynamically using the
set_trips callback. Additionally, the critical temperature threshold is
handled specifically.

Setting interrupts in this way also fixes a long-standing lockdep
warning, which was caused by calling thermal_zone_get_trips with our
lock being held. Do note that this requires TMU initialization to be
split into two parts, as done by the parent commit: parts of the
initialization call into the thermal_zone_device structure and so must
be done after its registration, but the initialization is also
responsible for setting up calibration, which must be done before
thermal_zone_device registration, which will call set_trips for the
first time; if the calibration is not done in time, the interrupt values
will be silently wrong!

Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Mateusz Majewski <m.majewski2@samsung.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20231201095625.301884-10-m.majewski2@samsung.com
2024-01-02 09:33:19 +01:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* exynos_tmu.c - Samsung Exynos TMU (Thermal Management Unit)
*
* Copyright (C) 2014 Samsung Electronics
* Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
* Lukasz Majewski <l.majewski@samsung.com>
*
* Copyright (C) 2011 Samsung Electronics
* Donggeun Kim <dg77.kim@samsung.com>
* Amit Daniel Kachhap <amit.kachhap@linaro.org>
*/
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/thermal.h>
#include <dt-bindings/thermal/thermal_exynos.h>
/* Exynos generic registers */
#define EXYNOS_TMU_REG_TRIMINFO 0x0
#define EXYNOS_TMU_REG_CONTROL 0x20
#define EXYNOS_TMU_REG_STATUS 0x28
#define EXYNOS_TMU_REG_CURRENT_TEMP 0x40
#define EXYNOS_TMU_REG_INTEN 0x70
#define EXYNOS_TMU_REG_INTSTAT 0x74
#define EXYNOS_TMU_REG_INTCLEAR 0x78
#define EXYNOS_TMU_TEMP_MASK 0xff
#define EXYNOS_TMU_REF_VOLTAGE_SHIFT 24
#define EXYNOS_TMU_REF_VOLTAGE_MASK 0x1f
#define EXYNOS_TMU_BUF_SLOPE_SEL_MASK 0xf
#define EXYNOS_TMU_BUF_SLOPE_SEL_SHIFT 8
#define EXYNOS_TMU_CORE_EN_SHIFT 0
/* Exynos3250 specific registers */
#define EXYNOS_TMU_TRIMINFO_CON1 0x10
/* Exynos4210 specific registers */
#define EXYNOS4210_TMU_REG_THRESHOLD_TEMP 0x44
#define EXYNOS4210_TMU_REG_TRIG_LEVEL0 0x50
/* Exynos5250, Exynos4412, Exynos3250 specific registers */
#define EXYNOS_TMU_TRIMINFO_CON2 0x14
#define EXYNOS_THD_TEMP_RISE 0x50
#define EXYNOS_THD_TEMP_FALL 0x54
#define EXYNOS_EMUL_CON 0x80
#define EXYNOS_TRIMINFO_RELOAD_ENABLE 1
#define EXYNOS_TRIMINFO_25_SHIFT 0
#define EXYNOS_TRIMINFO_85_SHIFT 8
#define EXYNOS_TMU_TRIP_MODE_SHIFT 13
#define EXYNOS_TMU_TRIP_MODE_MASK 0x7
#define EXYNOS_TMU_THERM_TRIP_EN_SHIFT 12
#define EXYNOS_TMU_INTEN_RISE0_SHIFT 0
#define EXYNOS_TMU_INTEN_FALL0_SHIFT 16
#define EXYNOS_EMUL_TIME 0x57F0
#define EXYNOS_EMUL_TIME_MASK 0xffff
#define EXYNOS_EMUL_TIME_SHIFT 16
#define EXYNOS_EMUL_DATA_SHIFT 8
#define EXYNOS_EMUL_DATA_MASK 0xFF
#define EXYNOS_EMUL_ENABLE 0x1
/* Exynos5260 specific */
#define EXYNOS5260_TMU_REG_INTEN 0xC0
#define EXYNOS5260_TMU_REG_INTSTAT 0xC4
#define EXYNOS5260_TMU_REG_INTCLEAR 0xC8
#define EXYNOS5260_EMUL_CON 0x100
/* Exynos4412 specific */
#define EXYNOS4412_MUX_ADDR_VALUE 6
#define EXYNOS4412_MUX_ADDR_SHIFT 20
/* Exynos5433 specific registers */
#define EXYNOS5433_THD_TEMP_RISE3_0 0x050
#define EXYNOS5433_THD_TEMP_RISE7_4 0x054
#define EXYNOS5433_THD_TEMP_FALL3_0 0x060
#define EXYNOS5433_THD_TEMP_FALL7_4 0x064
#define EXYNOS5433_TMU_REG_INTEN 0x0c0
#define EXYNOS5433_TMU_REG_INTPEND 0x0c8
#define EXYNOS5433_TMU_EMUL_CON 0x110
#define EXYNOS5433_TMU_PD_DET_EN 0x130
#define EXYNOS5433_TRIMINFO_SENSOR_ID_SHIFT 16
#define EXYNOS5433_TRIMINFO_CALIB_SEL_SHIFT 23
#define EXYNOS5433_TRIMINFO_SENSOR_ID_MASK \
(0xf << EXYNOS5433_TRIMINFO_SENSOR_ID_SHIFT)
#define EXYNOS5433_TRIMINFO_CALIB_SEL_MASK BIT(23)
#define EXYNOS5433_TRIMINFO_ONE_POINT_TRIMMING 0
#define EXYNOS5433_TRIMINFO_TWO_POINT_TRIMMING 1
#define EXYNOS5433_PD_DET_EN 1
#define EXYNOS5433_G3D_BASE 0x10070000
/* Exynos7 specific registers */
#define EXYNOS7_THD_TEMP_RISE7_6 0x50
#define EXYNOS7_THD_TEMP_FALL7_6 0x60
#define EXYNOS7_TMU_REG_INTEN 0x110
#define EXYNOS7_TMU_REG_INTPEND 0x118
#define EXYNOS7_TMU_REG_EMUL_CON 0x160
#define EXYNOS7_TMU_TEMP_MASK 0x1ff
#define EXYNOS7_PD_DET_EN_SHIFT 23
#define EXYNOS7_TMU_INTEN_RISE0_SHIFT 0
#define EXYNOS7_EMUL_DATA_SHIFT 7
#define EXYNOS7_EMUL_DATA_MASK 0x1ff
#define EXYNOS_FIRST_POINT_TRIM 25
#define EXYNOS_SECOND_POINT_TRIM 85
#define EXYNOS_NOISE_CANCEL_MODE 4
#define MCELSIUS 1000
enum soc_type {
SOC_ARCH_EXYNOS3250 = 1,
SOC_ARCH_EXYNOS4210,
SOC_ARCH_EXYNOS4412,
SOC_ARCH_EXYNOS5250,
SOC_ARCH_EXYNOS5260,
SOC_ARCH_EXYNOS5420,
SOC_ARCH_EXYNOS5420_TRIMINFO,
SOC_ARCH_EXYNOS5433,
SOC_ARCH_EXYNOS7,
};
/**
* struct exynos_tmu_data : A structure to hold the private data of the TMU
* driver
* @base: base address of the single instance of the TMU controller.
* @base_second: base address of the common registers of the TMU controller.
* @irq: irq number of the TMU controller.
* @soc: id of the SOC type.
* @lock: lock to implement synchronization.
* @clk: pointer to the clock structure.
* @clk_sec: pointer to the clock structure for accessing the base_second.
* @sclk: pointer to the clock structure for accessing the tmu special clk.
* @cal_type: calibration type for temperature
* @efuse_value: SoC defined fuse value
* @min_efuse_value: minimum valid trimming data
* @max_efuse_value: maximum valid trimming data
* @temp_error1: fused value of the first point trim.
* @temp_error2: fused value of the second point trim.
* @gain: gain of amplifier in the positive-TC generator block
* 0 < gain <= 15
* @reference_voltage: reference voltage of amplifier
* in the positive-TC generator block
* 0 < reference_voltage <= 31
* @tzd: pointer to thermal_zone_device structure
* @enabled: current status of TMU device
* @tmu_set_low_temp: SoC specific method to set trip (falling threshold)
* @tmu_set_high_temp: SoC specific method to set trip (rising threshold)
* @tmu_set_crit_temp: SoC specific method to set critical temperature
* @tmu_disable_low: SoC specific method to disable an interrupt (falling threshold)
* @tmu_disable_high: SoC specific method to disable an interrupt (rising threshold)
* @tmu_initialize: SoC specific TMU initialization method
* @tmu_control: SoC specific TMU control method
* @tmu_read: SoC specific TMU temperature read method
* @tmu_set_emulation: SoC specific TMU emulation setting method
* @tmu_clear_irqs: SoC specific TMU interrupts clearing method
*/
struct exynos_tmu_data {
void __iomem *base;
void __iomem *base_second;
int irq;
enum soc_type soc;
struct mutex lock;
struct clk *clk, *clk_sec, *sclk;
u32 cal_type;
u32 efuse_value;
u32 min_efuse_value;
u32 max_efuse_value;
u16 temp_error1, temp_error2;
u8 gain;
u8 reference_voltage;
struct thermal_zone_device *tzd;
bool enabled;
void (*tmu_set_low_temp)(struct exynos_tmu_data *data, u8 temp);
void (*tmu_set_high_temp)(struct exynos_tmu_data *data, u8 temp);
void (*tmu_set_crit_temp)(struct exynos_tmu_data *data, u8 temp);
void (*tmu_disable_low)(struct exynos_tmu_data *data);
void (*tmu_disable_high)(struct exynos_tmu_data *data);
void (*tmu_initialize)(struct platform_device *pdev);
void (*tmu_control)(struct platform_device *pdev, bool on);
int (*tmu_read)(struct exynos_tmu_data *data);
void (*tmu_set_emulation)(struct exynos_tmu_data *data, int temp);
void (*tmu_clear_irqs)(struct exynos_tmu_data *data);
};
/*
* TMU treats temperature as a mapped temperature code.
* The temperature is converted differently depending on the calibration type.
*/
static int temp_to_code(struct exynos_tmu_data *data, u8 temp)
{
if (data->cal_type == TYPE_ONE_POINT_TRIMMING)
return temp + data->temp_error1 - EXYNOS_FIRST_POINT_TRIM;
return (temp - EXYNOS_FIRST_POINT_TRIM) *
(data->temp_error2 - data->temp_error1) /
(EXYNOS_SECOND_POINT_TRIM - EXYNOS_FIRST_POINT_TRIM) +
data->temp_error1;
}
/*
* Calculate a temperature value from a temperature code.
* The unit of the temperature is degree Celsius.
*/
static int code_to_temp(struct exynos_tmu_data *data, u16 temp_code)
{
if (data->cal_type == TYPE_ONE_POINT_TRIMMING)
return temp_code - data->temp_error1 + EXYNOS_FIRST_POINT_TRIM;
return (temp_code - data->temp_error1) *
(EXYNOS_SECOND_POINT_TRIM - EXYNOS_FIRST_POINT_TRIM) /
(data->temp_error2 - data->temp_error1) +
EXYNOS_FIRST_POINT_TRIM;
}
static void sanitize_temp_error(struct exynos_tmu_data *data, u32 trim_info)
{
u16 tmu_temp_mask =
(data->soc == SOC_ARCH_EXYNOS7) ? EXYNOS7_TMU_TEMP_MASK
: EXYNOS_TMU_TEMP_MASK;
data->temp_error1 = trim_info & tmu_temp_mask;
data->temp_error2 = ((trim_info >> EXYNOS_TRIMINFO_85_SHIFT) &
EXYNOS_TMU_TEMP_MASK);
if (!data->temp_error1 ||
(data->min_efuse_value > data->temp_error1) ||
(data->temp_error1 > data->max_efuse_value))
data->temp_error1 = data->efuse_value & EXYNOS_TMU_TEMP_MASK;
if (!data->temp_error2)
data->temp_error2 =
(data->efuse_value >> EXYNOS_TRIMINFO_85_SHIFT) &
EXYNOS_TMU_TEMP_MASK;
}
static int exynos_tmu_initialize(struct platform_device *pdev)
{
struct exynos_tmu_data *data = platform_get_drvdata(pdev);
unsigned int status;
int ret = 0;
mutex_lock(&data->lock);
clk_enable(data->clk);
if (!IS_ERR(data->clk_sec))
clk_enable(data->clk_sec);
status = readb(data->base + EXYNOS_TMU_REG_STATUS);
if (!status) {
ret = -EBUSY;
} else {
data->tmu_initialize(pdev);
data->tmu_clear_irqs(data);
}
if (!IS_ERR(data->clk_sec))
clk_disable(data->clk_sec);
clk_disable(data->clk);
mutex_unlock(&data->lock);
return ret;
}
static int exynos_thermal_zone_configure(struct platform_device *pdev)
{
struct exynos_tmu_data *data = platform_get_drvdata(pdev);
struct thermal_zone_device *tzd = data->tzd;
int ret, temp;
ret = thermal_zone_get_crit_temp(tzd, &temp);
if (ret) {
/* FIXME: Remove this special case */
if (data->soc == SOC_ARCH_EXYNOS5433)
return 0;
dev_err(&pdev->dev,
"No CRITICAL trip point defined in device tree!\n");
return ret;
}
mutex_lock(&data->lock);
clk_enable(data->clk);
data->tmu_set_crit_temp(data, temp / MCELSIUS);
clk_disable(data->clk);
mutex_unlock(&data->lock);
return 0;
}
static u32 get_con_reg(struct exynos_tmu_data *data, u32 con)
{
if (data->soc == SOC_ARCH_EXYNOS4412 ||
data->soc == SOC_ARCH_EXYNOS3250)
con |= (EXYNOS4412_MUX_ADDR_VALUE << EXYNOS4412_MUX_ADDR_SHIFT);
con &= ~(EXYNOS_TMU_REF_VOLTAGE_MASK << EXYNOS_TMU_REF_VOLTAGE_SHIFT);
con |= data->reference_voltage << EXYNOS_TMU_REF_VOLTAGE_SHIFT;
con &= ~(EXYNOS_TMU_BUF_SLOPE_SEL_MASK << EXYNOS_TMU_BUF_SLOPE_SEL_SHIFT);
con |= (data->gain << EXYNOS_TMU_BUF_SLOPE_SEL_SHIFT);
con &= ~(EXYNOS_TMU_TRIP_MODE_MASK << EXYNOS_TMU_TRIP_MODE_SHIFT);
con |= (EXYNOS_NOISE_CANCEL_MODE << EXYNOS_TMU_TRIP_MODE_SHIFT);
return con;
}
static void exynos_tmu_control(struct platform_device *pdev, bool on)
{
struct exynos_tmu_data *data = platform_get_drvdata(pdev);
mutex_lock(&data->lock);
clk_enable(data->clk);
data->tmu_control(pdev, on);
data->enabled = on;
clk_disable(data->clk);
mutex_unlock(&data->lock);
}
static void exynos_tmu_update_bit(struct exynos_tmu_data *data, int reg_off,
int bit_off, bool enable)
{
u32 interrupt_en;
interrupt_en = readl(data->base + reg_off);
if (enable)
interrupt_en |= BIT(bit_off);
else
interrupt_en &= ~BIT(bit_off);
writel(interrupt_en, data->base + reg_off);
}
static void exynos_tmu_update_temp(struct exynos_tmu_data *data, int reg_off,
int bit_off, u8 temp)
{
u16 tmu_temp_mask;
u32 th;
tmu_temp_mask =
(data->soc == SOC_ARCH_EXYNOS7) ? EXYNOS7_TMU_TEMP_MASK
: EXYNOS_TMU_TEMP_MASK;
th = readl(data->base + reg_off);
th &= ~(tmu_temp_mask << bit_off);
th |= temp_to_code(data, temp) << bit_off;
writel(th, data->base + reg_off);
}
static void exynos4210_tmu_set_low_temp(struct exynos_tmu_data *data, u8 temp)
{
/*
* Failing thresholds are not supported on Exynos 4210.
* We use polling instead.
*/
}
static void exynos4210_tmu_set_high_temp(struct exynos_tmu_data *data, u8 temp)
{
temp = temp_to_code(data, temp);
writeb(temp, data->base + EXYNOS4210_TMU_REG_TRIG_LEVEL0 + 4);
exynos_tmu_update_bit(data, EXYNOS_TMU_REG_INTEN,
EXYNOS_TMU_INTEN_RISE0_SHIFT + 4, true);
}
static void exynos4210_tmu_disable_low(struct exynos_tmu_data *data)
{
/* Again, this is handled by polling. */
}
static void exynos4210_tmu_disable_high(struct exynos_tmu_data *data)
{
exynos_tmu_update_bit(data, EXYNOS_TMU_REG_INTEN,
EXYNOS_TMU_INTEN_RISE0_SHIFT + 4, false);
}
static void exynos4210_tmu_set_crit_temp(struct exynos_tmu_data *data, u8 temp)
{
/*
* Hardware critical temperature handling is not supported on Exynos 4210.
* We still set the critical temperature threshold, but this is only to
* make sure it is handled as soon as possible. It is just a normal interrupt.
*/
temp = temp_to_code(data, temp);
writeb(temp, data->base + EXYNOS4210_TMU_REG_TRIG_LEVEL0 + 12);
exynos_tmu_update_bit(data, EXYNOS_TMU_REG_INTEN,
EXYNOS_TMU_INTEN_RISE0_SHIFT + 12, true);
}
static void exynos4210_tmu_initialize(struct platform_device *pdev)
{
struct exynos_tmu_data *data = platform_get_drvdata(pdev);
sanitize_temp_error(data, readl(data->base + EXYNOS_TMU_REG_TRIMINFO));
writeb(0, data->base + EXYNOS4210_TMU_REG_THRESHOLD_TEMP);
}
static void exynos4412_tmu_set_low_temp(struct exynos_tmu_data *data, u8 temp)
{
exynos_tmu_update_temp(data, EXYNOS_THD_TEMP_FALL, 0, temp);
exynos_tmu_update_bit(data, EXYNOS_TMU_REG_INTEN,
EXYNOS_TMU_INTEN_FALL0_SHIFT, true);
}
static void exynos4412_tmu_set_high_temp(struct exynos_tmu_data *data, u8 temp)
{
exynos_tmu_update_temp(data, EXYNOS_THD_TEMP_RISE, 8, temp);
exynos_tmu_update_bit(data, EXYNOS_TMU_REG_INTEN,
EXYNOS_TMU_INTEN_RISE0_SHIFT + 4, true);
}
static void exynos4412_tmu_disable_low(struct exynos_tmu_data *data)
{
exynos_tmu_update_bit(data, EXYNOS_TMU_REG_INTEN,
EXYNOS_TMU_INTEN_FALL0_SHIFT, false);
}
static void exynos4412_tmu_set_crit_temp(struct exynos_tmu_data *data, u8 temp)
{
exynos_tmu_update_temp(data, EXYNOS_THD_TEMP_RISE, 24, temp);
exynos_tmu_update_bit(data, EXYNOS_TMU_REG_CONTROL,
EXYNOS_TMU_THERM_TRIP_EN_SHIFT, true);
}
static void exynos4412_tmu_initialize(struct platform_device *pdev)
{
struct exynos_tmu_data *data = platform_get_drvdata(pdev);
unsigned int trim_info, ctrl;
if (data->soc == SOC_ARCH_EXYNOS3250 ||
data->soc == SOC_ARCH_EXYNOS4412 ||
data->soc == SOC_ARCH_EXYNOS5250) {
if (data->soc == SOC_ARCH_EXYNOS3250) {
ctrl = readl(data->base + EXYNOS_TMU_TRIMINFO_CON1);
ctrl |= EXYNOS_TRIMINFO_RELOAD_ENABLE;
writel(ctrl, data->base + EXYNOS_TMU_TRIMINFO_CON1);
}
ctrl = readl(data->base + EXYNOS_TMU_TRIMINFO_CON2);
ctrl |= EXYNOS_TRIMINFO_RELOAD_ENABLE;
writel(ctrl, data->base + EXYNOS_TMU_TRIMINFO_CON2);
}
/* On exynos5420 the triminfo register is in the shared space */
if (data->soc == SOC_ARCH_EXYNOS5420_TRIMINFO)
trim_info = readl(data->base_second + EXYNOS_TMU_REG_TRIMINFO);
else
trim_info = readl(data->base + EXYNOS_TMU_REG_TRIMINFO);
sanitize_temp_error(data, trim_info);
}
static void exynos5433_tmu_set_low_temp(struct exynos_tmu_data *data, u8 temp)
{
exynos_tmu_update_temp(data, EXYNOS5433_THD_TEMP_FALL3_0, 0, temp);
exynos_tmu_update_bit(data, EXYNOS5433_TMU_REG_INTEN,
EXYNOS_TMU_INTEN_FALL0_SHIFT, true);
}
static void exynos5433_tmu_set_high_temp(struct exynos_tmu_data *data, u8 temp)
{
exynos_tmu_update_temp(data, EXYNOS5433_THD_TEMP_RISE3_0, 8, temp);
exynos_tmu_update_bit(data, EXYNOS5433_TMU_REG_INTEN,
EXYNOS7_TMU_INTEN_RISE0_SHIFT + 1, true);
}
static void exynos5433_tmu_disable_low(struct exynos_tmu_data *data)
{
exynos_tmu_update_bit(data, EXYNOS5433_TMU_REG_INTEN,
EXYNOS_TMU_INTEN_FALL0_SHIFT, false);
}
static void exynos5433_tmu_disable_high(struct exynos_tmu_data *data)
{
exynos_tmu_update_bit(data, EXYNOS5433_TMU_REG_INTEN,
EXYNOS7_TMU_INTEN_RISE0_SHIFT + 1, false);
}
static void exynos5433_tmu_set_crit_temp(struct exynos_tmu_data *data, u8 temp)
{
exynos_tmu_update_temp(data, EXYNOS5433_THD_TEMP_RISE7_4, 24, temp);
exynos_tmu_update_bit(data, EXYNOS_TMU_REG_CONTROL,
EXYNOS_TMU_THERM_TRIP_EN_SHIFT, true);
exynos_tmu_update_bit(data, EXYNOS5433_TMU_REG_INTEN,
EXYNOS7_TMU_INTEN_RISE0_SHIFT + 7, true);
}
static void exynos5433_tmu_initialize(struct platform_device *pdev)
{
struct exynos_tmu_data *data = platform_get_drvdata(pdev);
unsigned int trim_info;
int sensor_id, cal_type;
trim_info = readl(data->base + EXYNOS_TMU_REG_TRIMINFO);
sanitize_temp_error(data, trim_info);
/* Read the temperature sensor id */
sensor_id = (trim_info & EXYNOS5433_TRIMINFO_SENSOR_ID_MASK)
>> EXYNOS5433_TRIMINFO_SENSOR_ID_SHIFT;
dev_info(&pdev->dev, "Temperature sensor ID: 0x%x\n", sensor_id);
/* Read the calibration mode */
writel(trim_info, data->base + EXYNOS_TMU_REG_TRIMINFO);
cal_type = (trim_info & EXYNOS5433_TRIMINFO_CALIB_SEL_MASK)
>> EXYNOS5433_TRIMINFO_CALIB_SEL_SHIFT;
switch (cal_type) {
case EXYNOS5433_TRIMINFO_TWO_POINT_TRIMMING:
data->cal_type = TYPE_TWO_POINT_TRIMMING;
break;
case EXYNOS5433_TRIMINFO_ONE_POINT_TRIMMING:
default:
data->cal_type = TYPE_ONE_POINT_TRIMMING;
break;
}
dev_info(&pdev->dev, "Calibration type is %d-point calibration\n",
cal_type ? 2 : 1);
}
static void exynos7_tmu_set_low_temp(struct exynos_tmu_data *data, u8 temp)
{
exynos_tmu_update_temp(data, EXYNOS7_THD_TEMP_FALL7_6 + 12, 0, temp);
exynos_tmu_update_bit(data, EXYNOS7_TMU_REG_INTEN,
EXYNOS_TMU_INTEN_FALL0_SHIFT + 0, true);
}
static void exynos7_tmu_set_high_temp(struct exynos_tmu_data *data, u8 temp)
{
exynos_tmu_update_temp(data, EXYNOS7_THD_TEMP_RISE7_6 + 12, 16, temp);
exynos_tmu_update_bit(data, EXYNOS7_TMU_REG_INTEN,
EXYNOS7_TMU_INTEN_RISE0_SHIFT + 1, true);
}
static void exynos7_tmu_disable_low(struct exynos_tmu_data *data)
{
exynos_tmu_update_bit(data, EXYNOS7_TMU_REG_INTEN,
EXYNOS_TMU_INTEN_FALL0_SHIFT + 0, false);
}
static void exynos7_tmu_disable_high(struct exynos_tmu_data *data)
{
exynos_tmu_update_bit(data, EXYNOS7_TMU_REG_INTEN,
EXYNOS7_TMU_INTEN_RISE0_SHIFT + 1, false);
}
static void exynos7_tmu_set_crit_temp(struct exynos_tmu_data *data, u8 temp)
{
/*
* Like Exynos 4210, Exynos 7 does not seem to support critical temperature
* handling in hardware. Again, we still set a separate interrupt for it.
*/
exynos_tmu_update_temp(data, EXYNOS7_THD_TEMP_RISE7_6 + 0, 16, temp);
exynos_tmu_update_bit(data, EXYNOS7_TMU_REG_INTEN,
EXYNOS7_TMU_INTEN_RISE0_SHIFT + 7, true);
}
static void exynos7_tmu_initialize(struct platform_device *pdev)
{
struct exynos_tmu_data *data = platform_get_drvdata(pdev);
unsigned int trim_info;
trim_info = readl(data->base + EXYNOS_TMU_REG_TRIMINFO);
sanitize_temp_error(data, trim_info);
}
static void exynos4210_tmu_control(struct platform_device *pdev, bool on)
{
struct exynos_tmu_data *data = platform_get_drvdata(pdev);
unsigned int con;
con = get_con_reg(data, readl(data->base + EXYNOS_TMU_REG_CONTROL));
if (on)
con |= BIT(EXYNOS_TMU_CORE_EN_SHIFT);
else
con &= ~BIT(EXYNOS_TMU_CORE_EN_SHIFT);
writel(con, data->base + EXYNOS_TMU_REG_CONTROL);
}
static void exynos5433_tmu_control(struct platform_device *pdev, bool on)
{
struct exynos_tmu_data *data = platform_get_drvdata(pdev);
unsigned int con, pd_det_en;
con = get_con_reg(data, readl(data->base + EXYNOS_TMU_REG_CONTROL));
if (on)
con |= BIT(EXYNOS_TMU_CORE_EN_SHIFT);
else
con &= ~BIT(EXYNOS_TMU_CORE_EN_SHIFT);
pd_det_en = on ? EXYNOS5433_PD_DET_EN : 0;
writel(pd_det_en, data->base + EXYNOS5433_TMU_PD_DET_EN);
writel(con, data->base + EXYNOS_TMU_REG_CONTROL);
}
static void exynos7_tmu_control(struct platform_device *pdev, bool on)
{
struct exynos_tmu_data *data = platform_get_drvdata(pdev);
unsigned int con;
con = get_con_reg(data, readl(data->base + EXYNOS_TMU_REG_CONTROL));
if (on) {
con |= BIT(EXYNOS_TMU_CORE_EN_SHIFT);
con |= BIT(EXYNOS7_PD_DET_EN_SHIFT);
} else {
con &= ~BIT(EXYNOS_TMU_CORE_EN_SHIFT);
con &= ~BIT(EXYNOS7_PD_DET_EN_SHIFT);
}
writel(con, data->base + EXYNOS_TMU_REG_CONTROL);
}
static int exynos_get_temp(struct thermal_zone_device *tz, int *temp)
{
struct exynos_tmu_data *data = thermal_zone_device_priv(tz);
int value, ret = 0;
if (!data || !data->tmu_read)
return -EINVAL;
else if (!data->enabled)
/*
* Called too early, probably
* from thermal_zone_of_sensor_register().
*/
return -EAGAIN;
mutex_lock(&data->lock);
clk_enable(data->clk);
value = data->tmu_read(data);
if (value < 0)
ret = value;
else
*temp = code_to_temp(data, value) * MCELSIUS;
clk_disable(data->clk);
mutex_unlock(&data->lock);
return ret;
}
#ifdef CONFIG_THERMAL_EMULATION
static u32 get_emul_con_reg(struct exynos_tmu_data *data, unsigned int val,
int temp)
{
if (temp) {
temp /= MCELSIUS;
val &= ~(EXYNOS_EMUL_TIME_MASK << EXYNOS_EMUL_TIME_SHIFT);
val |= (EXYNOS_EMUL_TIME << EXYNOS_EMUL_TIME_SHIFT);
if (data->soc == SOC_ARCH_EXYNOS7) {
val &= ~(EXYNOS7_EMUL_DATA_MASK <<
EXYNOS7_EMUL_DATA_SHIFT);
val |= (temp_to_code(data, temp) <<
EXYNOS7_EMUL_DATA_SHIFT) |
EXYNOS_EMUL_ENABLE;
} else {
val &= ~(EXYNOS_EMUL_DATA_MASK <<
EXYNOS_EMUL_DATA_SHIFT);
val |= (temp_to_code(data, temp) <<
EXYNOS_EMUL_DATA_SHIFT) |
EXYNOS_EMUL_ENABLE;
}
} else {
val &= ~EXYNOS_EMUL_ENABLE;
}
return val;
}
static void exynos4412_tmu_set_emulation(struct exynos_tmu_data *data,
int temp)
{
unsigned int val;
u32 emul_con;
if (data->soc == SOC_ARCH_EXYNOS5260)
emul_con = EXYNOS5260_EMUL_CON;
else if (data->soc == SOC_ARCH_EXYNOS5433)
emul_con = EXYNOS5433_TMU_EMUL_CON;
else if (data->soc == SOC_ARCH_EXYNOS7)
emul_con = EXYNOS7_TMU_REG_EMUL_CON;
else
emul_con = EXYNOS_EMUL_CON;
val = readl(data->base + emul_con);
val = get_emul_con_reg(data, val, temp);
writel(val, data->base + emul_con);
}
static int exynos_tmu_set_emulation(struct thermal_zone_device *tz, int temp)
{
struct exynos_tmu_data *data = thermal_zone_device_priv(tz);
int ret = -EINVAL;
if (data->soc == SOC_ARCH_EXYNOS4210)
goto out;
if (temp && temp < MCELSIUS)
goto out;
mutex_lock(&data->lock);
clk_enable(data->clk);
data->tmu_set_emulation(data, temp);
clk_disable(data->clk);
mutex_unlock(&data->lock);
return 0;
out:
return ret;
}
#else
#define exynos4412_tmu_set_emulation NULL
static int exynos_tmu_set_emulation(struct thermal_zone_device *tz, int temp)
{ return -EINVAL; }
#endif /* CONFIG_THERMAL_EMULATION */
static int exynos4210_tmu_read(struct exynos_tmu_data *data)
{
int ret = readb(data->base + EXYNOS_TMU_REG_CURRENT_TEMP);
/* "temp_code" should range between 75 and 175 */
return (ret < 75 || ret > 175) ? -ENODATA : ret;
}
static int exynos4412_tmu_read(struct exynos_tmu_data *data)
{
return readb(data->base + EXYNOS_TMU_REG_CURRENT_TEMP);
}
static int exynos7_tmu_read(struct exynos_tmu_data *data)
{
return readw(data->base + EXYNOS_TMU_REG_CURRENT_TEMP) &
EXYNOS7_TMU_TEMP_MASK;
}
static irqreturn_t exynos_tmu_threaded_irq(int irq, void *id)
{
struct exynos_tmu_data *data = id;
thermal_zone_device_update(data->tzd, THERMAL_EVENT_UNSPECIFIED);
mutex_lock(&data->lock);
clk_enable(data->clk);
/* TODO: take action based on particular interrupt */
data->tmu_clear_irqs(data);
clk_disable(data->clk);
mutex_unlock(&data->lock);
return IRQ_HANDLED;
}
static void exynos4210_tmu_clear_irqs(struct exynos_tmu_data *data)
{
unsigned int val_irq;
u32 tmu_intstat, tmu_intclear;
if (data->soc == SOC_ARCH_EXYNOS5260) {
tmu_intstat = EXYNOS5260_TMU_REG_INTSTAT;
tmu_intclear = EXYNOS5260_TMU_REG_INTCLEAR;
} else if (data->soc == SOC_ARCH_EXYNOS7) {
tmu_intstat = EXYNOS7_TMU_REG_INTPEND;
tmu_intclear = EXYNOS7_TMU_REG_INTPEND;
} else if (data->soc == SOC_ARCH_EXYNOS5433) {
tmu_intstat = EXYNOS5433_TMU_REG_INTPEND;
tmu_intclear = EXYNOS5433_TMU_REG_INTPEND;
} else {
tmu_intstat = EXYNOS_TMU_REG_INTSTAT;
tmu_intclear = EXYNOS_TMU_REG_INTCLEAR;
}
val_irq = readl(data->base + tmu_intstat);
/*
* Clear the interrupts. Please note that the documentation for
* Exynos3250, Exynos4412, Exynos5250 and Exynos5260 incorrectly
* states that INTCLEAR register has a different placing of bits
* responsible for FALL IRQs than INTSTAT register. Exynos5420
* and Exynos5440 documentation is correct (Exynos4210 doesn't
* support FALL IRQs at all).
*/
writel(val_irq, data->base + tmu_intclear);
}
static const struct of_device_id exynos_tmu_match[] = {
{
.compatible = "samsung,exynos3250-tmu",
.data = (const void *)SOC_ARCH_EXYNOS3250,
}, {
.compatible = "samsung,exynos4210-tmu",
.data = (const void *)SOC_ARCH_EXYNOS4210,
}, {
.compatible = "samsung,exynos4412-tmu",
.data = (const void *)SOC_ARCH_EXYNOS4412,
}, {
.compatible = "samsung,exynos5250-tmu",
.data = (const void *)SOC_ARCH_EXYNOS5250,
}, {
.compatible = "samsung,exynos5260-tmu",
.data = (const void *)SOC_ARCH_EXYNOS5260,
}, {
.compatible = "samsung,exynos5420-tmu",
.data = (const void *)SOC_ARCH_EXYNOS5420,
}, {
.compatible = "samsung,exynos5420-tmu-ext-triminfo",
.data = (const void *)SOC_ARCH_EXYNOS5420_TRIMINFO,
}, {
.compatible = "samsung,exynos5433-tmu",
.data = (const void *)SOC_ARCH_EXYNOS5433,
}, {
.compatible = "samsung,exynos7-tmu",
.data = (const void *)SOC_ARCH_EXYNOS7,
},
{ },
};
MODULE_DEVICE_TABLE(of, exynos_tmu_match);
static int exynos_map_dt_data(struct platform_device *pdev)
{
struct exynos_tmu_data *data = platform_get_drvdata(pdev);
struct resource res;
if (!data || !pdev->dev.of_node)
return -ENODEV;
data->irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
if (data->irq <= 0) {
dev_err(&pdev->dev, "failed to get IRQ\n");
return -ENODEV;
}
if (of_address_to_resource(pdev->dev.of_node, 0, &res)) {
dev_err(&pdev->dev, "failed to get Resource 0\n");
return -ENODEV;
}
data->base = devm_ioremap(&pdev->dev, res.start, resource_size(&res));
if (!data->base) {
dev_err(&pdev->dev, "Failed to ioremap memory\n");
return -EADDRNOTAVAIL;
}
data->soc = (uintptr_t)of_device_get_match_data(&pdev->dev);
switch (data->soc) {
case SOC_ARCH_EXYNOS4210:
data->tmu_set_low_temp = exynos4210_tmu_set_low_temp;
data->tmu_set_high_temp = exynos4210_tmu_set_high_temp;
data->tmu_disable_low = exynos4210_tmu_disable_low;
data->tmu_disable_high = exynos4210_tmu_disable_high;
data->tmu_set_crit_temp = exynos4210_tmu_set_crit_temp;
data->tmu_initialize = exynos4210_tmu_initialize;
data->tmu_control = exynos4210_tmu_control;
data->tmu_read = exynos4210_tmu_read;
data->tmu_clear_irqs = exynos4210_tmu_clear_irqs;
data->gain = 15;
data->reference_voltage = 7;
data->efuse_value = 55;
data->min_efuse_value = 40;
data->max_efuse_value = 100;
break;
case SOC_ARCH_EXYNOS3250:
case SOC_ARCH_EXYNOS4412:
case SOC_ARCH_EXYNOS5250:
case SOC_ARCH_EXYNOS5260:
case SOC_ARCH_EXYNOS5420:
case SOC_ARCH_EXYNOS5420_TRIMINFO:
data->tmu_set_low_temp = exynos4412_tmu_set_low_temp;
data->tmu_set_high_temp = exynos4412_tmu_set_high_temp;
data->tmu_disable_low = exynos4412_tmu_disable_low;
data->tmu_disable_high = exynos4210_tmu_disable_high;
data->tmu_set_crit_temp = exynos4412_tmu_set_crit_temp;
data->tmu_initialize = exynos4412_tmu_initialize;
data->tmu_control = exynos4210_tmu_control;
data->tmu_read = exynos4412_tmu_read;
data->tmu_set_emulation = exynos4412_tmu_set_emulation;
data->tmu_clear_irqs = exynos4210_tmu_clear_irqs;
data->gain = 8;
data->reference_voltage = 16;
data->efuse_value = 55;
if (data->soc != SOC_ARCH_EXYNOS5420 &&
data->soc != SOC_ARCH_EXYNOS5420_TRIMINFO)
data->min_efuse_value = 40;
else
data->min_efuse_value = 0;
data->max_efuse_value = 100;
break;
case SOC_ARCH_EXYNOS5433:
data->tmu_set_low_temp = exynos5433_tmu_set_low_temp;
data->tmu_set_high_temp = exynos5433_tmu_set_high_temp;
data->tmu_disable_low = exynos5433_tmu_disable_low;
data->tmu_disable_high = exynos5433_tmu_disable_high;
data->tmu_set_crit_temp = exynos5433_tmu_set_crit_temp;
data->tmu_initialize = exynos5433_tmu_initialize;
data->tmu_control = exynos5433_tmu_control;
data->tmu_read = exynos4412_tmu_read;
data->tmu_set_emulation = exynos4412_tmu_set_emulation;
data->tmu_clear_irqs = exynos4210_tmu_clear_irqs;
data->gain = 8;
if (res.start == EXYNOS5433_G3D_BASE)
data->reference_voltage = 23;
else
data->reference_voltage = 16;
data->efuse_value = 75;
data->min_efuse_value = 40;
data->max_efuse_value = 150;
break;
case SOC_ARCH_EXYNOS7:
data->tmu_set_low_temp = exynos7_tmu_set_low_temp;
data->tmu_set_high_temp = exynos7_tmu_set_high_temp;
data->tmu_disable_low = exynos7_tmu_disable_low;
data->tmu_disable_high = exynos7_tmu_disable_high;
data->tmu_set_crit_temp = exynos7_tmu_set_crit_temp;
data->tmu_initialize = exynos7_tmu_initialize;
data->tmu_control = exynos7_tmu_control;
data->tmu_read = exynos7_tmu_read;
data->tmu_set_emulation = exynos4412_tmu_set_emulation;
data->tmu_clear_irqs = exynos4210_tmu_clear_irqs;
data->gain = 9;
data->reference_voltage = 17;
data->efuse_value = 75;
data->min_efuse_value = 15;
data->max_efuse_value = 100;
break;
default:
dev_err(&pdev->dev, "Platform not supported\n");
return -EINVAL;
}
data->cal_type = TYPE_ONE_POINT_TRIMMING;
/*
* Check if the TMU shares some registers and then try to map the
* memory of common registers.
*/
if (data->soc != SOC_ARCH_EXYNOS5420_TRIMINFO)
return 0;
if (of_address_to_resource(pdev->dev.of_node, 1, &res)) {
dev_err(&pdev->dev, "failed to get Resource 1\n");
return -ENODEV;
}
data->base_second = devm_ioremap(&pdev->dev, res.start,
resource_size(&res));
if (!data->base_second) {
dev_err(&pdev->dev, "Failed to ioremap memory\n");
return -ENOMEM;
}
return 0;
}
static int exynos_set_trips(struct thermal_zone_device *tz, int low, int high)
{
struct exynos_tmu_data *data = thermal_zone_device_priv(tz);
mutex_lock(&data->lock);
clk_enable(data->clk);
if (low > INT_MIN)
data->tmu_set_low_temp(data, low / MCELSIUS);
else
data->tmu_disable_low(data);
if (high < INT_MAX)
data->tmu_set_high_temp(data, high / MCELSIUS);
else
data->tmu_disable_high(data);
clk_disable(data->clk);
mutex_unlock(&data->lock);
return 0;
}
static const struct thermal_zone_device_ops exynos_sensor_ops = {
.get_temp = exynos_get_temp,
.set_emul_temp = exynos_tmu_set_emulation,
.set_trips = exynos_set_trips,
};
static int exynos_tmu_probe(struct platform_device *pdev)
{
struct exynos_tmu_data *data;
int ret;
data = devm_kzalloc(&pdev->dev, sizeof(struct exynos_tmu_data),
GFP_KERNEL);
if (!data)
return -ENOMEM;
platform_set_drvdata(pdev, data);
mutex_init(&data->lock);
/*
* Try enabling the regulator if found
* TODO: Add regulator as an SOC feature, so that regulator enable
* is a compulsory call.
*/
ret = devm_regulator_get_enable_optional(&pdev->dev, "vtmu");
switch (ret) {
case 0:
case -ENODEV:
break;
case -EPROBE_DEFER:
return -EPROBE_DEFER;
default:
dev_err(&pdev->dev, "Failed to get enabled regulator: %d\n",
ret);
return ret;
}
ret = exynos_map_dt_data(pdev);
if (ret)
return ret;
data->clk = devm_clk_get(&pdev->dev, "tmu_apbif");
if (IS_ERR(data->clk)) {
dev_err(&pdev->dev, "Failed to get clock\n");
return PTR_ERR(data->clk);
}
data->clk_sec = devm_clk_get(&pdev->dev, "tmu_triminfo_apbif");
if (IS_ERR(data->clk_sec)) {
if (data->soc == SOC_ARCH_EXYNOS5420_TRIMINFO) {
dev_err(&pdev->dev, "Failed to get triminfo clock\n");
return PTR_ERR(data->clk_sec);
}
} else {
ret = clk_prepare(data->clk_sec);
if (ret) {
dev_err(&pdev->dev, "Failed to get clock\n");
return ret;
}
}
ret = clk_prepare(data->clk);
if (ret) {
dev_err(&pdev->dev, "Failed to get clock\n");
goto err_clk_sec;
}
switch (data->soc) {
case SOC_ARCH_EXYNOS5433:
case SOC_ARCH_EXYNOS7:
data->sclk = devm_clk_get(&pdev->dev, "tmu_sclk");
if (IS_ERR(data->sclk)) {
dev_err(&pdev->dev, "Failed to get sclk\n");
ret = PTR_ERR(data->sclk);
goto err_clk;
} else {
ret = clk_prepare_enable(data->sclk);
if (ret) {
dev_err(&pdev->dev, "Failed to enable sclk\n");
goto err_clk;
}
}
break;
default:
break;
}
ret = exynos_tmu_initialize(pdev);
if (ret) {
dev_err(&pdev->dev, "Failed to initialize TMU\n");
goto err_sclk;
}
data->tzd = devm_thermal_of_zone_register(&pdev->dev, 0, data,
&exynos_sensor_ops);
if (IS_ERR(data->tzd)) {
ret = PTR_ERR(data->tzd);
if (ret != -EPROBE_DEFER)
dev_err(&pdev->dev, "Failed to register sensor: %d\n",
ret);
goto err_sclk;
}
ret = exynos_thermal_zone_configure(pdev);
if (ret) {
dev_err(&pdev->dev, "Failed to configure the thermal zone\n");
goto err_sclk;
}
ret = devm_request_threaded_irq(&pdev->dev, data->irq, NULL,
exynos_tmu_threaded_irq,
IRQF_TRIGGER_RISING
| IRQF_SHARED | IRQF_ONESHOT,
dev_name(&pdev->dev), data);
if (ret) {
dev_err(&pdev->dev, "Failed to request irq: %d\n", data->irq);
goto err_sclk;
}
exynos_tmu_control(pdev, true);
return 0;
err_sclk:
clk_disable_unprepare(data->sclk);
err_clk:
clk_unprepare(data->clk);
err_clk_sec:
if (!IS_ERR(data->clk_sec))
clk_unprepare(data->clk_sec);
return ret;
}
static void exynos_tmu_remove(struct platform_device *pdev)
{
struct exynos_tmu_data *data = platform_get_drvdata(pdev);
exynos_tmu_control(pdev, false);
clk_disable_unprepare(data->sclk);
clk_unprepare(data->clk);
if (!IS_ERR(data->clk_sec))
clk_unprepare(data->clk_sec);
}
#ifdef CONFIG_PM_SLEEP
static int exynos_tmu_suspend(struct device *dev)
{
exynos_tmu_control(to_platform_device(dev), false);
return 0;
}
static int exynos_tmu_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
exynos_tmu_initialize(pdev);
exynos_tmu_control(pdev, true);
return 0;
}
static SIMPLE_DEV_PM_OPS(exynos_tmu_pm,
exynos_tmu_suspend, exynos_tmu_resume);
#define EXYNOS_TMU_PM (&exynos_tmu_pm)
#else
#define EXYNOS_TMU_PM NULL
#endif
static struct platform_driver exynos_tmu_driver = {
.driver = {
.name = "exynos-tmu",
.pm = EXYNOS_TMU_PM,
.of_match_table = exynos_tmu_match,
},
.probe = exynos_tmu_probe,
.remove_new = exynos_tmu_remove,
};
module_platform_driver(exynos_tmu_driver);
MODULE_DESCRIPTION("Exynos TMU Driver");
MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:exynos-tmu");
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