drivers/power/exynos-tmu.c - github/trini/u-boot - Gitiles

 /*
  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
  *      http://www.samsung.com
  * Akshay Saraswat <akshay.s@samsung.com>
  *
  * EXYNOS - Thermal Management Unit
  *
  * See file CREDITS for list of people who contributed to this
  * project.
  *
  * 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.
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  * MA 02111-1307 USA
  */

 #include <common.h>
 #include <errno.h>
 #include <fdtdec.h>
 #include <tmu.h>
 #include <asm/arch/tmu.h>

 #define TRIMINFO_RELOAD		1
 #define CORE_EN			1

 #define INTEN_RISE0		1
 #define INTEN_RISE1		(1 << 4)
 #define INTEN_RISE2		(1 << 8)
 #define INTEN_FALL0		(1 << 16)
 #define INTEN_FALL1		(1 << 20)
 #define INTEN_FALL2		(1 << 24)

 #define TRIM_INFO_MASK		0xff

 #define INTCLEAR_RISE0		1
 #define INTCLEAR_RISE1		(1 << 4)
 #define INTCLEAR_RISE2		(1 << 8)
 #define INTCLEAR_FALL0		(1 << 16)
 #define INTCLEAR_FALL1		(1 << 20)
 #define INTCLEAR_FALL2		(1 << 24)
 #define INTCLEARALL		(INTCLEAR_RISE0 | INTCLEAR_RISE1 | \
 				 INTCLEAR_RISE2 | INTCLEAR_FALL0 | \
 				 INTCLEAR_FALL1 | INTCLEAR_FALL2)

 /* Tmeperature threshold values for various thermal events */
 struct temperature_params {
 	/* minimum value in temperature code range */
 	unsigned int min_val;
 	/* maximum value in temperature code range */
 	unsigned int max_val;
 	/* temperature threshold to start warning */
 	unsigned int start_warning;
 	/* temperature threshold CPU tripping */
 	unsigned int start_tripping;
 };

 /* Pre-defined values and thresholds for calibration of current temperature */
 struct tmu_data {
 	/* pre-defined temperature thresholds */
 	struct temperature_params ts;
 	/* pre-defined efuse range minimum value */
 	unsigned int efuse_min_value;
 	/* pre-defined efuse value for temperature calibration */
 	unsigned int efuse_value;
 	/* pre-defined efuse range maximum value */
 	unsigned int efuse_max_value;
 	/* current temperature sensing slope */
 	unsigned int slope;
 };

 /* TMU device specific details and status */
 struct tmu_info {
 	/* base Address for the TMU */
 	unsigned tmu_base;
 	/* pre-defined values for calibration and thresholds */
 	struct tmu_data data;
 	/* value required for triminfo_25 calibration */
 	unsigned int te1;
 	/* value required for triminfo_85 calibration */
 	unsigned int te2;
 	/* Value for measured data calibration */
 	int dc_value;
 	/* enum value indicating status of the TMU */
 	int tmu_state;
 };

 /* Global struct tmu_info variable to store init values */
 static struct tmu_info gbl_info;

 /*
  * Get current temperature code from register,
  * then calculate and calibrate it's value
  * in degree celsius.
  *
  * @return	current temperature of the chip as sensed by TMU
  */
 static int get_cur_temp(struct tmu_info *info)
 {
 	int cur_temp;
 	struct exynos5_tmu_reg *reg = (struct exynos5_tmu_reg *)info->tmu_base;

 	/*
 	 * Temperature code range between min 25 and max 125.
 	 * May run more than once for first call as initial sensing
 	 * has not yet happened.
 	 */
 	do {
 		cur_temp = readl(&reg->current_temp) & 0xff;
 	} while (cur_temp == 0 && info->tmu_state == TMU_STATUS_NORMAL);

 	/* Calibrate current temperature */
 	cur_temp = cur_temp - info->te1 + info->dc_value;

 	return cur_temp;
 }

 /*
  * Monitors status of the TMU device and exynos temperature
  *
  * @param temp	pointer to the current temperature value
  * @return	enum tmu_status_t value, code indicating event to execute
  */
 enum tmu_status_t tmu_monitor(int *temp)
 {
 	int cur_temp;
 	struct tmu_data *data = &gbl_info.data;

 	if (gbl_info.tmu_state == TMU_STATUS_INIT)
 		return TMU_STATUS_INIT;

 	/* Read current temperature of the SOC */
 	cur_temp = get_cur_temp(&gbl_info);
 	*temp = cur_temp;

 	/* Temperature code lies between min 25 and max 125 */
 	if (cur_temp >= data->ts.start_tripping &&
 			cur_temp <= data->ts.max_val) {
 		return TMU_STATUS_TRIPPED;
 	} else if (cur_temp >= data->ts.start_warning) {
 		return TMU_STATUS_WARNING;
 	} else if (cur_temp < data->ts.start_warning &&
 			cur_temp >= data->ts.min_val) {
 		return TMU_STATUS_NORMAL;
 	} else {
 		/* Temperature code does not lie between min 25 and max 125 */
 		gbl_info.tmu_state = TMU_STATUS_INIT;
 		debug("EXYNOS_TMU: Thermal reading failed\n");
 		return TMU_STATUS_INIT;
 	}
 }

 /*
  * Get TMU specific pre-defined values from FDT
  *
  * @param info	pointer to the tmu_info struct
  * @param blob  FDT blob
  * @return	int value, 0 for success
  */
 static int get_tmu_fdt_values(struct tmu_info *info, const void *blob)
 {
 #ifdef CONFIG_OF_CONTROL
 	int node;
 	int error = 0;

 	/* Get the node from FDT for TMU */
 	node = fdtdec_next_compatible(blob, 0,
 				      COMPAT_SAMSUNG_EXYNOS_TMU);
 	if (node < 0) {
 		debug("EXYNOS_TMU: No node for tmu in device tree\n");
 		return -1;
 	}

 	/*
 	 * Get the pre-defined TMU specific values from FDT.
 	 * All of these are expected to be correct otherwise
 	 * miscalculation of register values in tmu_setup_parameters
 	 * may result in misleading current temperature.
 	 */
 	info->tmu_base = fdtdec_get_addr(blob, node, "reg");
 	if (info->tmu_base == FDT_ADDR_T_NONE) {
 		debug("%s: Missing tmu-base\n", __func__);
 		return -1;
 	}
 	info->data.ts.min_val = fdtdec_get_int(blob,
 				node, "samsung,min-temp", -1);
 	error |= info->data.ts.min_val;
 	info->data.ts.max_val = fdtdec_get_int(blob,
 				node, "samsung,max-temp", -1);
 	error |= info->data.ts.max_val;
 	info->data.ts.start_warning = fdtdec_get_int(blob,
 				node, "samsung,start-warning", -1);
 	error |= info->data.ts.start_warning;
 	info->data.ts.start_tripping = fdtdec_get_int(blob,
 				node, "samsung,start-tripping", -1);
 	error |= info->data.ts.start_tripping;
 	info->data.efuse_min_value = fdtdec_get_int(blob,
 				node, "samsung,efuse-min-value", -1);
 	error |= info->data.efuse_min_value;
 	info->data.efuse_value = fdtdec_get_int(blob,
 				node, "samsung,efuse-value", -1);
 	error |= info->data.efuse_value;
 	info->data.efuse_max_value = fdtdec_get_int(blob,
 				node, "samsung,efuse-max-value", -1);
 	error |= info->data.efuse_max_value;
 	info->data.slope = fdtdec_get_int(blob,
 				node, "samsung,slope", -1);
 	error |= info->data.slope;
 	info->dc_value = fdtdec_get_int(blob,
 				node, "samsung,dc-value", -1);
 	error |= info->dc_value;

 	if (error == -1) {
 		debug("fail to get tmu node properties\n");
 		return -1;
 	}
 #endif

 	return 0;
 }

 /*
  * Calibrate and calculate threshold values and
  * enable interrupt levels
  *
  * @param	info pointer to the tmu_info struct
  */
 static void tmu_setup_parameters(struct tmu_info *info)
 {
 	unsigned int te_code, con;
 	unsigned int warning_code, trip_code;
 	unsigned int cooling_temp;
 	unsigned int rising_value;
 	struct tmu_data *data = &info->data;
 	struct exynos5_tmu_reg *reg = (struct exynos5_tmu_reg *)info->tmu_base;

 	/* Must reload for reading efuse value from triminfo register */
 	writel(TRIMINFO_RELOAD, &reg->triminfo_control);

 	/* Get the compensation parameter */
 	te_code = readl(&reg->triminfo);
 	info->te1 = te_code & TRIM_INFO_MASK;
 	info->te2 = ((te_code >> 8) & TRIM_INFO_MASK);

 	if ((data->efuse_min_value > info->te1) ||
 			(info->te1 > data->efuse_max_value)
 			||  (info->te2 != 0))
 		info->te1 = data->efuse_value;

 	/* Get RISING & FALLING Threshold value */
 	warning_code = data->ts.start_warning
 			+ info->te1 - info->dc_value;
 	trip_code = data->ts.start_tripping
 			+ info->te1 - info->dc_value;
 	cooling_temp = 0;

 	rising_value = ((warning_code << 8) | (trip_code << 16));

 	/* Set interrupt level */
 	writel(rising_value, &reg->threshold_temp_rise);
 	writel(cooling_temp, &reg->threshold_temp_fall);

 	/*
 	 * Init TMU control tuning parameters
 	 * [28:24] VREF - Voltage reference
 	 * [15:13] THERM_TRIP_MODE - Tripping mode
 	 * [12] THERM_TRIP_EN - Thermal tripping enable
 	 * [11:8] BUF_SLOPE_SEL - Gain of amplifier
 	 * [6] THERM_TRIP_BY_TQ_EN - Tripping by TQ pin
 	 */
 	writel(data->slope, &reg->tmu_control);

 	writel(INTCLEARALL, &reg->intclear);

 	/* TMU core enable */
 	con = readl(&reg->tmu_control);
 	con |= CORE_EN;

 	writel(con, &reg->tmu_control);

 	/* LEV0 LEV1 LEV2 interrupt enable */
 	writel(INTEN_RISE0 | INTEN_RISE1 | INTEN_RISE2,	&reg->inten);
 }

 /*
  * Initialize TMU device
  *
  * @param blob  FDT blob
  * @return	int value, 0 for success
  */
 int tmu_init(const void *blob)
 {
 	gbl_info.tmu_state = TMU_STATUS_INIT;
 	if (get_tmu_fdt_values(&gbl_info, blob) < 0)
 		goto ret;

 	tmu_setup_parameters(&gbl_info);
 	gbl_info.tmu_state = TMU_STATUS_NORMAL;
 ret:

 	return gbl_info.tmu_state;
 }
	/*
	* Copyright (c) 2012 Samsung Electronics Co., Ltd.
	* http://www.samsung.com
	* Akshay Saraswat <akshay.s@samsung.com>
	*
	* EXYNOS - Thermal Management Unit
	*
	* See file CREDITS for list of people who contributed to this
	* project.
	*
	* 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.
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	* MA 02111-1307 USA
	*/

	#include <common.h>
	#include <errno.h>
	#include <fdtdec.h>
	#include <tmu.h>
	#include <asm/arch/tmu.h>

	#define TRIMINFO_RELOAD 1
	#define CORE_EN 1

	#define INTEN_RISE0 1
	#define INTEN_RISE1 (1 << 4)
	#define INTEN_RISE2 (1 << 8)
	#define INTEN_FALL0 (1 << 16)
	#define INTEN_FALL1 (1 << 20)
	#define INTEN_FALL2 (1 << 24)

	#define TRIM_INFO_MASK 0xff

	#define INTCLEAR_RISE0 1
	#define INTCLEAR_RISE1 (1 << 4)
	#define INTCLEAR_RISE2 (1 << 8)
	#define INTCLEAR_FALL0 (1 << 16)
	#define INTCLEAR_FALL1 (1 << 20)
	#define INTCLEAR_FALL2 (1 << 24)
	#define INTCLEARALL (INTCLEAR_RISE0 \| INTCLEAR_RISE1 \| \
	INTCLEAR_RISE2 \| INTCLEAR_FALL0 \| \
	INTCLEAR_FALL1 \| INTCLEAR_FALL2)

	/* Tmeperature threshold values for various thermal events */
	struct temperature_params {
	/* minimum value in temperature code range */
	unsigned int min_val;
	/* maximum value in temperature code range */
	unsigned int max_val;
	/* temperature threshold to start warning */
	unsigned int start_warning;
	/* temperature threshold CPU tripping */
	unsigned int start_tripping;
	};

	/* Pre-defined values and thresholds for calibration of current temperature */
	struct tmu_data {
	/* pre-defined temperature thresholds */
	struct temperature_params ts;
	/* pre-defined efuse range minimum value */
	unsigned int efuse_min_value;
	/* pre-defined efuse value for temperature calibration */
	unsigned int efuse_value;
	/* pre-defined efuse range maximum value */
	unsigned int efuse_max_value;
	/* current temperature sensing slope */
	unsigned int slope;
	};

	/* TMU device specific details and status */
	struct tmu_info {
	/* base Address for the TMU */
	unsigned tmu_base;
	/* pre-defined values for calibration and thresholds */
	struct tmu_data data;
	/* value required for triminfo_25 calibration */
	unsigned int te1;
	/* value required for triminfo_85 calibration */
	unsigned int te2;
	/* Value for measured data calibration */
	int dc_value;
	/* enum value indicating status of the TMU */
	int tmu_state;
	};

	/* Global struct tmu_info variable to store init values */
	static struct tmu_info gbl_info;

	/*
	* Get current temperature code from register,
	* then calculate and calibrate it's value
	* in degree celsius.
	*
	* @return current temperature of the chip as sensed by TMU
	*/
	static int get_cur_temp(struct tmu_info *info)
	{
	int cur_temp;
	struct exynos5_tmu_reg reg = (struct exynos5_tmu_reg )info->tmu_base;

	/*
	* Temperature code range between min 25 and max 125.
	* May run more than once for first call as initial sensing
	* has not yet happened.
	*/
	do {
	cur_temp = readl(&reg->current_temp) & 0xff;
	} while (cur_temp == 0 && info->tmu_state == TMU_STATUS_NORMAL);

	/* Calibrate current temperature */
	cur_temp = cur_temp - info->te1 + info->dc_value;

	return cur_temp;
	}

	/*
	* Monitors status of the TMU device and exynos temperature
	*
	* @param temp pointer to the current temperature value
	* @return enum tmu_status_t value, code indicating event to execute
	*/
	enum tmu_status_t tmu_monitor(int *temp)
	{
	int cur_temp;
	struct tmu_data *data = &gbl_info.data;

	if (gbl_info.tmu_state == TMU_STATUS_INIT)
	return TMU_STATUS_INIT;

	/* Read current temperature of the SOC */
	cur_temp = get_cur_temp(&gbl_info);
	*temp = cur_temp;

	/* Temperature code lies between min 25 and max 125 */
	if (cur_temp >= data->ts.start_tripping &&
	cur_temp <= data->ts.max_val) {
	return TMU_STATUS_TRIPPED;
	} else if (cur_temp >= data->ts.start_warning) {
	return TMU_STATUS_WARNING;
	} else if (cur_temp < data->ts.start_warning &&
	cur_temp >= data->ts.min_val) {
	return TMU_STATUS_NORMAL;
	} else {
	/* Temperature code does not lie between min 25 and max 125 */
	gbl_info.tmu_state = TMU_STATUS_INIT;
	debug("EXYNOS_TMU: Thermal reading failed\n");
	return TMU_STATUS_INIT;
	}
	}

	/*
	* Get TMU specific pre-defined values from FDT
	*
	* @param info pointer to the tmu_info struct
	* @param blob FDT blob
	* @return int value, 0 for success
	*/
	static int get_tmu_fdt_values(struct tmu_info info, const void blob)
	{
	#ifdef CONFIG_OF_CONTROL
	int node;
	int error = 0;

	/* Get the node from FDT for TMU */
	node = fdtdec_next_compatible(blob, 0,
	COMPAT_SAMSUNG_EXYNOS_TMU);
	if (node < 0) {
	debug("EXYNOS_TMU: No node for tmu in device tree\n");
	return -1;
	}

	/*
	* Get the pre-defined TMU specific values from FDT.
	* All of these are expected to be correct otherwise
	* miscalculation of register values in tmu_setup_parameters
	* may result in misleading current temperature.
	*/
	info->tmu_base = fdtdec_get_addr(blob, node, "reg");
	if (info->tmu_base == FDT_ADDR_T_NONE) {
	debug("%s: Missing tmu-base\n", __func__);
	return -1;
	}
	info->data.ts.min_val = fdtdec_get_int(blob,
	node, "samsung,min-temp", -1);
	error \|= info->data.ts.min_val;
	info->data.ts.max_val = fdtdec_get_int(blob,
	node, "samsung,max-temp", -1);
	error \|= info->data.ts.max_val;
	info->data.ts.start_warning = fdtdec_get_int(blob,
	node, "samsung,start-warning", -1);
	error \|= info->data.ts.start_warning;
	info->data.ts.start_tripping = fdtdec_get_int(blob,
	node, "samsung,start-tripping", -1);
	error \|= info->data.ts.start_tripping;
	info->data.efuse_min_value = fdtdec_get_int(blob,
	node, "samsung,efuse-min-value", -1);
	error \|= info->data.efuse_min_value;
	info->data.efuse_value = fdtdec_get_int(blob,
	node, "samsung,efuse-value", -1);
	error \|= info->data.efuse_value;
	info->data.efuse_max_value = fdtdec_get_int(blob,
	node, "samsung,efuse-max-value", -1);
	error \|= info->data.efuse_max_value;
	info->data.slope = fdtdec_get_int(blob,
	node, "samsung,slope", -1);
	error \|= info->data.slope;
	info->dc_value = fdtdec_get_int(blob,
	node, "samsung,dc-value", -1);
	error \|= info->dc_value;

	if (error == -1) {
	debug("fail to get tmu node properties\n");
	return -1;
	}
	#endif

	return 0;
	}

	/*
	* Calibrate and calculate threshold values and
	* enable interrupt levels
	*
	* @param info pointer to the tmu_info struct
	*/
	static void tmu_setup_parameters(struct tmu_info *info)
	{
	unsigned int te_code, con;
	unsigned int warning_code, trip_code;
	unsigned int cooling_temp;
	unsigned int rising_value;
	struct tmu_data *data = &info->data;
	struct exynos5_tmu_reg reg = (struct exynos5_tmu_reg )info->tmu_base;

	/* Must reload for reading efuse value from triminfo register */
	writel(TRIMINFO_RELOAD, &reg->triminfo_control);

	/* Get the compensation parameter */
	te_code = readl(&reg->triminfo);
	info->te1 = te_code & TRIM_INFO_MASK;
	info->te2 = ((te_code >> 8) & TRIM_INFO_MASK);

	if ((data->efuse_min_value > info->te1) \|\|
	(info->te1 > data->efuse_max_value)
	\|\| (info->te2 != 0))
	info->te1 = data->efuse_value;

	/* Get RISING & FALLING Threshold value */
	warning_code = data->ts.start_warning
	+ info->te1 - info->dc_value;
	trip_code = data->ts.start_tripping
	+ info->te1 - info->dc_value;
	cooling_temp = 0;

	rising_value = ((warning_code << 8) \| (trip_code << 16));

	/* Set interrupt level */
	writel(rising_value, &reg->threshold_temp_rise);
	writel(cooling_temp, &reg->threshold_temp_fall);

	/*
	* Init TMU control tuning parameters
	* [28:24] VREF - Voltage reference
	* [15:13] THERM_TRIP_MODE - Tripping mode
	* [12] THERM_TRIP_EN - Thermal tripping enable
	* [11:8] BUF_SLOPE_SEL - Gain of amplifier
	* [6] THERM_TRIP_BY_TQ_EN - Tripping by TQ pin
	*/
	writel(data->slope, &reg->tmu_control);

	writel(INTCLEARALL, &reg->intclear);

	/* TMU core enable */
	con = readl(&reg->tmu_control);
	con \|= CORE_EN;

	writel(con, &reg->tmu_control);

	/* LEV0 LEV1 LEV2 interrupt enable */
	writel(INTEN_RISE0 \| INTEN_RISE1 \| INTEN_RISE2, &reg->inten);
	}

	/*
	* Initialize TMU device
	*
	* @param blob FDT blob
	* @return int value, 0 for success
	*/
	int tmu_init(const void *blob)
	{
	gbl_info.tmu_state = TMU_STATUS_INIT;
	if (get_tmu_fdt_values(&gbl_info, blob) < 0)
	goto ret;

	tmu_setup_parameters(&gbl_info);
	gbl_info.tmu_state = TMU_STATUS_NORMAL;
	ret:

	return gbl_info.tmu_state;
	}