u-boot/drivers/power/exynos-tmu.c

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/*
* 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 <log.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 min_val;
/* maximum value in temperature code range */
unsigned max_val;
/* temperature threshold to start warning */
unsigned start_warning;
/* temperature threshold CPU tripping */
unsigned start_tripping;
/* temperature threshold for HW tripping */
unsigned 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 efuse_min_value;
/* pre-defined efuse value for temperature calibration */
unsigned efuse_value;
/* pre-defined efuse range maximum value */
unsigned efuse_max_value;
/* current temperature sensing slope */
unsigned slope;
};
/* TMU device specific details and status */
struct tmu_info {
/* base Address for the TMU */
struct exynos5_tmu_reg *tmu_base;
/* mux Address for the TMU */
int tmu_mux;
/* pre-defined values for calibration and thresholds */
struct tmu_data data;
/* value required for triminfo_25 calibration */
unsigned te1;
/* value required for triminfo_85 calibration */
unsigned 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)
{
struct exynos5_tmu_reg *reg = info->tmu_base;
ulong start;
int cur_temp = 0;
/*
* Temperature code range between min 25 and max 125.
* May run more than once for first call as initial sensing
* has not yet happened.
*/
if (info->tmu_state == TMU_STATUS_NORMAL) {
start = get_timer(0);
do {
cur_temp = readl(&reg->current_temp) & 0xff;
} while ((cur_temp == 0) || (get_timer(start) > 100));
}
if (cur_temp == 0)
return cur_temp;
/* 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);
if (!cur_temp)
goto out;
*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;
if (cur_temp >= data->ts.start_warning)
return TMU_STATUS_WARNING;
if ((cur_temp < data->ts.start_warning) &&
(cur_temp >= data->ts.min_val))
return TMU_STATUS_NORMAL;
out:
/* 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)
{
#if CONFIG_IS_ENABLED(OF_CONTROL)
fdt_addr_t addr;
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 -ENODEV;
}
/*
* 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.
*/
addr = fdtdec_get_addr(blob, node, "reg");
if (addr == FDT_ADDR_T_NONE) {
debug("%s: Missing tmu-base\n", __func__);
return -ENODEV;
}
info->tmu_base = (struct exynos5_tmu_reg *)addr;
/* Optional field. */
info->tmu_mux = fdtdec_get_int(blob,
node, "samsung,mux", -1);
/* Take default value as per the user manual b(110) */
if (info->tmu_mux == -1)
info->tmu_mux = 0x6;
info->data.ts.min_val = fdtdec_get_int(blob,
node, "samsung,min-temp", -1);
error |= (info->data.ts.min_val == -1);
info->data.ts.max_val = fdtdec_get_int(blob,
node, "samsung,max-temp", -1);
error |= (info->data.ts.max_val == -1);
info->data.ts.start_warning = fdtdec_get_int(blob,
node, "samsung,start-warning", -1);
error |= (info->data.ts.start_warning == -1);
info->data.ts.start_tripping = fdtdec_get_int(blob,
node, "samsung,start-tripping", -1);
error |= (info->data.ts.start_tripping == -1);
info->data.ts.hardware_tripping = fdtdec_get_int(blob,
node, "samsung,hw-tripping", -1);
error |= (info->data.ts.hardware_tripping == -1);
info->data.efuse_min_value = fdtdec_get_int(blob,
node, "samsung,efuse-min-value", -1);
error |= (info->data.efuse_min_value == -1);
info->data.efuse_value = fdtdec_get_int(blob,
node, "samsung,efuse-value", -1);
error |= (info->data.efuse_value == -1);
info->data.efuse_max_value = fdtdec_get_int(blob,
node, "samsung,efuse-max-value", -1);
error |= (info->data.efuse_max_value == -1);
info->data.slope = fdtdec_get_int(blob,
node, "samsung,slope", -1);
error |= (info->data.slope == -1);
info->dc_value = fdtdec_get_int(blob,
node, "samsung,dc-value", -1);
error |= (info->dc_value == -1);
if (error) {
debug("fail to get tmu node properties\n");
return -EINVAL;
}
#else
/* Non DT support may never be added. Just in case */
return -ENODEV;
#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 te_code, con;
unsigned warning_code, trip_code, hwtrip_code;
unsigned cooling_temp;
unsigned rising_value;
struct tmu_data *data = &info->data;
struct exynos5_tmu_reg *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 | (info->tmu_mux << 20);
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;
}