3a0b1dae5b
This adds hardware tripping at 110 degrees celsius which must enable forced system shutdown in case TMU fails to power off. Signed-off-by: Akshay Saraswat <akshay.s@samsung.com> Acked-by: Simon Glass <sjg@chromium.org> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
320 lines
8.9 KiB
C
320 lines
8.9 KiB
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(®->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, ®->triminfo_control);
|
|
|
|
/* Get the compensation parameter */
|
|
te_code = readl(®->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, ®->threshold_temp_rise);
|
|
writel(cooling_temp, ®->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, ®->tmu_control);
|
|
|
|
writel(INTCLEARALL, ®->intclear);
|
|
|
|
/* TMU core enable */
|
|
con = readl(®->tmu_control);
|
|
con |= THERM_TRIP_EN | CORE_EN;
|
|
|
|
writel(con, ®->tmu_control);
|
|
|
|
/* Enable HW thermal trip */
|
|
set_hw_thermal_trip();
|
|
|
|
/* LEV1 LEV2 interrupt enable */
|
|
writel(INTEN_RISE1 | INTEN_RISE2, ®->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;
|
|
}
|