[people/ms/u-boot.git] / drivers / power / exynos-tmu.c

/*
 * 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>
#include <asm/arch/power.h>

#define TRIMINFO_RELOAD		1
#define CORE_EN			1
#define THERM_TRIP_EN		(1 << 12)

#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;
	/* temperature threshold for HW tripping */
	unsigned int hardware_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.ts.hardware_tripping = fdtdec_get_int(blob,
				node, "samsung,hw-tripping", -1);
	error |= info->data.ts.hardware_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, hwtrip_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;
	hwtrip_code = data->ts.hardware_tripping
			+ info->te1 - info->dc_value;

	cooling_temp = 0;

	rising_value = ((warning_code << 8) |
			(trip_code << 16) |
			(hwtrip_code << 24));

	/* 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 |= THERM_TRIP_EN | CORE_EN;

	writel(con, &reg->tmu_control);

	/* Enable HW thermal trip */
	set_hw_thermal_trip();

	/* LEV1 LEV2 interrupt enable */
	writel(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;
}
Commit	Line	Data
39d182d3 AS	1	/*
	2	* Copyright (c) 2012 Samsung Electronics Co., Ltd.
	3	* http://www.samsung.com
	4	* Akshay Saraswat <akshay.s@samsung.com>
	5	*
	6	* EXYNOS - Thermal Management Unit
	7	*
	8	* See file CREDITS for list of people who contributed to this
	9	* project.
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License version 2 as
	13	* published by the Free Software Foundation.
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	17	* MA 02111-1307 USA
	18	*/
	19
	20	#include <common.h>
	21	#include <errno.h>
	22	#include <fdtdec.h>
	23	#include <tmu.h>
	24	#include <asm/arch/tmu.h>
3a0b1dae	25	#include <asm/arch/power.h>
39d182d3 AS	26
	27	#define TRIMINFO_RELOAD 1
	28	#define CORE_EN 1
3a0b1dae	29	#define THERM_TRIP_EN (1 << 12)
39d182d3 AS	30
	31	#define INTEN_RISE0 1
	32	#define INTEN_RISE1 (1 << 4)
	33	#define INTEN_RISE2 (1 << 8)
	34	#define INTEN_FALL0 (1 << 16)
	35	#define INTEN_FALL1 (1 << 20)
	36	#define INTEN_FALL2 (1 << 24)
	37
	38	#define TRIM_INFO_MASK 0xff
	39
	40	#define INTCLEAR_RISE0 1
	41	#define INTCLEAR_RISE1 (1 << 4)
	42	#define INTCLEAR_RISE2 (1 << 8)
	43	#define INTCLEAR_FALL0 (1 << 16)
	44	#define INTCLEAR_FALL1 (1 << 20)
	45	#define INTCLEAR_FALL2 (1 << 24)
	46	#define INTCLEARALL (INTCLEAR_RISE0 \| INTCLEAR_RISE1 \| \
	47	INTCLEAR_RISE2 \| INTCLEAR_FALL0 \| \
	48	INTCLEAR_FALL1 \| INTCLEAR_FALL2)
	49
	50	/* Tmeperature threshold values for various thermal events */
	51	struct temperature_params {
	52	/* minimum value in temperature code range */
	53	unsigned int min_val;
	54	/* maximum value in temperature code range */
	55	unsigned int max_val;
	56	/* temperature threshold to start warning */
	57	unsigned int start_warning;
	58	/* temperature threshold CPU tripping */
	59	unsigned int start_tripping;
3a0b1dae AS	60	/* temperature threshold for HW tripping */
3a0b1dae AS	61	unsigned int hardware_tripping;
39d182d3 AS	62	};
	63
	64	/* Pre-defined values and thresholds for calibration of current temperature */
	65	struct tmu_data {
	66	/* pre-defined temperature thresholds */
	67	struct temperature_params ts;
	68	/* pre-defined efuse range minimum value */
	69	unsigned int efuse_min_value;
	70	/* pre-defined efuse value for temperature calibration */
	71	unsigned int efuse_value;
	72	/* pre-defined efuse range maximum value */
	73	unsigned int efuse_max_value;
	74	/* current temperature sensing slope */
	75	unsigned int slope;
	76	};
	77
	78	/* TMU device specific details and status */
	79	struct tmu_info {
	80	/* base Address for the TMU */
	81	unsigned tmu_base;
	82	/* pre-defined values for calibration and thresholds */
	83	struct tmu_data data;
	84	/* value required for triminfo_25 calibration */
	85	unsigned int te1;
	86	/* value required for triminfo_85 calibration */
	87	unsigned int te2;
	88	/* Value for measured data calibration */
	89	int dc_value;
	90	/* enum value indicating status of the TMU */
	91	int tmu_state;
	92	};
	93
	94	/* Global struct tmu_info variable to store init values */
	95	static struct tmu_info gbl_info;
	96
	97	/*
	98	* Get current temperature code from register,
	99	* then calculate and calibrate it's value
	100	* in degree celsius.
	101	*
	102	* @return current temperature of the chip as sensed by TMU
	103	*/
	104	static int get_cur_temp(struct tmu_info *info)
	105	{
	106	int cur_temp;
	107	struct exynos5_tmu_reg reg = (struct exynos5_tmu_reg )info->tmu_base;
	108
	109	/*
	110	* Temperature code range between min 25 and max 125.
	111	* May run more than once for first call as initial sensing
	112	* has not yet happened.
	113	*/
	114	do {
	115	cur_temp = readl(&reg->current_temp) & 0xff;
	116	} while (cur_temp == 0 && info->tmu_state == TMU_STATUS_NORMAL);
	117
	118	/* Calibrate current temperature */
	119	cur_temp = cur_temp - info->te1 + info->dc_value;
	120
	121	return cur_temp;
	122	}
	123
	124	/*
	125	* Monitors status of the TMU device and exynos temperature
126	*
127	* @param temp pointer to the current temperature value
128	* @return enum tmu_status_t value, code indicating event to execute
129	*/
130	enum tmu_status_t tmu_monitor(int *temp)
131	{
132	int cur_temp;
133	struct tmu_data *data = &gbl_info.data;
134
135	if (gbl_info.tmu_state == TMU_STATUS_INIT)
136	return TMU_STATUS_INIT;
137
138	/* Read current temperature of the SOC */
139	cur_temp = get_cur_temp(&gbl_info);
140	*temp = cur_temp;
141
142	/* Temperature code lies between min 25 and max 125 */
143	if (cur_temp >= data->ts.start_tripping &&
144	cur_temp <= data->ts.max_val) {
145	return TMU_STATUS_TRIPPED;
146	} else if (cur_temp >= data->ts.start_warning) {
147	return TMU_STATUS_WARNING;
148	} else if (cur_temp < data->ts.start_warning &&
149	cur_temp >= data->ts.min_val) {
150	return TMU_STATUS_NORMAL;
151	} else {
152	/* Temperature code does not lie between min 25 and max 125 */
153	gbl_info.tmu_state = TMU_STATUS_INIT;
154	debug("EXYNOS_TMU: Thermal reading failed\n");
155	return TMU_STATUS_INIT;
156	}
157	}
158
159	/*
160	* Get TMU specific pre-defined values from FDT
161	*
162	* @param info pointer to the tmu_info struct
163	* @param blob FDT blob
164	* @return int value, 0 for success
165	*/
166	static int get_tmu_fdt_values(struct tmu_info info, const void blob)
167	{
168	#ifdef CONFIG_OF_CONTROL
169	int node;
170	int error = 0;
171
172	/* Get the node from FDT for TMU */
173	node = fdtdec_next_compatible(blob, 0,
174	COMPAT_SAMSUNG_EXYNOS_TMU);
175	if (node < 0) {
176	debug("EXYNOS_TMU: No node for tmu in device tree\n");
177	return -1;
178	}
179
180	/*
181	* Get the pre-defined TMU specific values from FDT.
182	* All of these are expected to be correct otherwise
183	* miscalculation of register values in tmu_setup_parameters
184	* may result in misleading current temperature.
185	*/
186	info->tmu_base = fdtdec_get_addr(blob, node, "reg");
187	if (info->tmu_base == FDT_ADDR_T_NONE) {
188	debug("%s: Missing tmu-base\n", __func__);
189	return -1;
190	}
191	info->data.ts.min_val = fdtdec_get_int(blob,
192	node, "samsung,min-temp", -1);
193	error \|= info->data.ts.min_val;
194	info->data.ts.max_val = fdtdec_get_int(blob,
195	node, "samsung,max-temp", -1);
196	error \|= info->data.ts.max_val;
197	info->data.ts.start_warning = fdtdec_get_int(blob,
198	node, "samsung,start-warning", -1);
199	error \|= info->data.ts.start_warning;
200	info->data.ts.start_tripping = fdtdec_get_int(blob,
201	node, "samsung,start-tripping", -1);
202	error \|= info->data.ts.start_tripping;
3a0b1dae AS	203	info->data.ts.hardware_tripping = fdtdec_get_int(blob,
	204	node, "samsung,hw-tripping", -1);
	205	error \|= info->data.ts.hardware_tripping;
39d182d3 AS	206	info->data.efuse_min_value = fdtdec_get_int(blob,
	207	node, "samsung,efuse-min-value", -1);
	208	error \|= info->data.efuse_min_value;
	209	info->data.efuse_value = fdtdec_get_int(blob,
	210	node, "samsung,efuse-value", -1);
	211	error \|= info->data.efuse_value;
	212	info->data.efuse_max_value = fdtdec_get_int(blob,
	213	node, "samsung,efuse-max-value", -1);
	214	error \|= info->data.efuse_max_value;
	215	info->data.slope = fdtdec_get_int(blob,
	216	node, "samsung,slope", -1);
	217	error \|= info->data.slope;
	218	info->dc_value = fdtdec_get_int(blob,
	219	node, "samsung,dc-value", -1);
	220	error \|= info->dc_value;
	221
	222	if (error == -1) {
	223	debug("fail to get tmu node properties\n");
	224	return -1;
	225	}
	226	#endif
	227
	228	return 0;
	229	}
	230
	231	/*
	232	* Calibrate and calculate threshold values and
	233	* enable interrupt levels
	234	*
	235	* @param info pointer to the tmu_info struct
	236	*/
	237	static void tmu_setup_parameters(struct tmu_info *info)
	238	{
	239	unsigned int te_code, con;
3a0b1dae	240	unsigned int warning_code, trip_code, hwtrip_code;
39d182d3 AS	241	unsigned int cooling_temp;
	242	unsigned int rising_value;
	243	struct tmu_data *data = &info->data;
	244	struct exynos5_tmu_reg reg = (struct exynos5_tmu_reg )info->tmu_base;
	245
	246	/* Must reload for reading efuse value from triminfo register */
	247	writel(TRIMINFO_RELOAD, &reg->triminfo_control);
	248
	249	/* Get the compensation parameter */
	250	te_code = readl(&reg->triminfo);
	251	info->te1 = te_code & TRIM_INFO_MASK;
	252	info->te2 = ((te_code >> 8) & TRIM_INFO_MASK);
	253
	254	if ((data->efuse_min_value > info->te1) \|\|
	255	(info->te1 > data->efuse_max_value)
	256	\|\| (info->te2 != 0))
	257	info->te1 = data->efuse_value;
	258
	259	/* Get RISING & FALLING Threshold value */
	260	warning_code = data->ts.start_warning
	261	+ info->te1 - info->dc_value;
	262	trip_code = data->ts.start_tripping
	263	+ info->te1 - info->dc_value;
3a0b1dae AS	264	hwtrip_code = data->ts.hardware_tripping
	265	+ info->te1 - info->dc_value;
	266
39d182d3 AS	267	cooling_temp = 0;
39d182d3 AS	268
3a0b1dae AS	269	rising_value = ((warning_code << 8) \|
	270	(trip_code << 16) \|
	271	(hwtrip_code << 24));
39d182d3 AS	272
	273	/* Set interrupt level */
	274	writel(rising_value, &reg->threshold_temp_rise);
	275	writel(cooling_temp, &reg->threshold_temp_fall);
	276
	277	/*
	278	* Init TMU control tuning parameters
	279	* [28:24] VREF - Voltage reference
	280	* [15:13] THERM_TRIP_MODE - Tripping mode
	281	* [12] THERM_TRIP_EN - Thermal tripping enable
	282	* [11:8] BUF_SLOPE_SEL - Gain of amplifier
	283	* [6] THERM_TRIP_BY_TQ_EN - Tripping by TQ pin
	284	*/
	285	writel(data->slope, &reg->tmu_control);
	286
	287	writel(INTCLEARALL, &reg->intclear);
	288
	289	/* TMU core enable */
	290	con = readl(&reg->tmu_control);
3a0b1dae	291	con \|= THERM_TRIP_EN \| CORE_EN;
39d182d3 AS	292
	293	writel(con, &reg->tmu_control);
	294
3a0b1dae AS	295	/* Enable HW thermal trip */
	296	set_hw_thermal_trip();
	297
	298	/* LEV1 LEV2 interrupt enable */
	299	writel(INTEN_RISE1 \| INTEN_RISE2, &reg->inten);
39d182d3 AS	300	}
	301
	302	/*
	303	* Initialize TMU device
	304	*
	305	* @param blob FDT blob
	306	* @return int value, 0 for success
	307	*/
	308	int tmu_init(const void *blob)
	309	{
	310	gbl_info.tmu_state = TMU_STATUS_INIT;
	311	if (get_tmu_fdt_values(&gbl_info, blob) < 0)
	312	goto ret;
	313
	314	tmu_setup_parameters(&gbl_info);
	315	gbl_info.tmu_state = TMU_STATUS_NORMAL;
	316	ret:
	317
	318	return gbl_info.tmu_state;
	319	}