| Message ID | 1358766705-2118-2-git-send-email-akshay.s@samsung.com |
|---|---|
| State | Changes Requested |
| Delegated to: | Minkyu Kang |
| Headers | show |
Hi Akshay, On Mon, Jan 21, 2013 at 3:11 AM, Akshay Saraswat <akshay.s@samsung.com> wrote: > Adding Exynos Thermal Management Unit driver to monitor SOC > temperature and take actions corresponding to states of TMU. > > Signed-off-by: Akshay Saraswat <akshay.s@samsung.com> Acked-by: Simon Glass <sjg@chromium.org> See a few nits below in case you do a v5. > --- > Changes since v4: > - Changed return value of get_cur_temp in case of 0 degree temp from -1 to TMU_STATUS_INIT because return value should be enum tmu_status_t. > > arch/arm/include/asm/arch-exynos/exynos-tmu.h | 58 +++++ > drivers/power/Makefile | 1 + > drivers/power/exynos-tmu.c | 297 +++++++++++++++++++++++++ > include/tmu.h | 46 ++++ > 4 files changed, 402 insertions(+) > create mode 100644 arch/arm/include/asm/arch-exynos/exynos-tmu.h > create mode 100644 drivers/power/exynos-tmu.c > create mode 100644 include/tmu.h > > diff --git a/drivers/power/Makefile b/drivers/power/Makefile > index 8c71901..a5c7027 100644 > --- a/drivers/power/Makefile > +++ b/drivers/power/Makefile > @@ -30,6 +30,7 @@ COBJS-$(CONFIG_TPS6586X_POWER) += tps6586x.o > COBJS-$(CONFIG_TWL4030_POWER) += twl4030.o > COBJS-$(CONFIG_TWL6030_POWER) += twl6030.o > COBJS-$(CONFIG_TWL6035_POWER) += twl6035.o > +COBJS-$(CONFIG_EXYNOS_TMU) += exynos-tmu.o Should be in alphabetical order by CONFIG name > > COBJS-$(CONFIG_POWER) += power_core.o > COBJS-$(CONFIG_DIALOG_POWER) += power_dialog.o > diff --git a/drivers/power/exynos-tmu.c b/drivers/power/exynos-tmu.c > new file mode 100644 > index 0000000..c48fe28 > --- /dev/null > +++ b/drivers/power/exynos-tmu.c > @@ -0,0 +1,297 @@ > +/* > + * 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/exynos-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; > + /* 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 int te1; > + /* value required for triminfo_85 calibration */ > + unsigned int te2; > + /* TMU DC value for threshold calculation */ > + 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 > + */ > +int get_cur_temp(struct tmu_info *info) > +{ > + int cur_temp; > + struct tmu_reg *reg = (struct tmu_reg *)info->tmu_base; > + > + /* Temperature code range between min 25 and max 125 */ > + cur_temp = readl(®->current_temp) & 0xff; > + > + /* Calibrate current temperature */ > + if (cur_temp) > + 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) > +{ > + if (gbl_info.tmu_state == TMU_STATUS_INIT) > + return TMU_STATUS_INIT; > + > + int cur_temp; > + struct tmu_data *data = &gbl_info.data; > + > + /* 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; > + /* Temperature code does not lie between min 25 and max 125 */ > + else { > + gbl_info.tmu_state = TMU_STATUS_INIT; > + debug("EXYNOS_TMU: Thermal reading failed\n"); > + return TMU_STATUS_INIT; > + } The else has {} but no the others. Does checkpatch / patman not pick this up? > +} > + > +/* > + * 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 > + */ > +int get_tmu_fdt_values(struct tmu_info *info, const void *blob) > +{ > + 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->tmu_mux = fdtdec_get_int(blob, > + node, "samsung,mux", -1); > + error |= info->tmu_mux; > + 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; > + } > + > + return 0; > +} > + > +/* > + * Calibrate and calculate threshold values and > + * enable interrupt levels > + * > + * @param info pointer to the tmu_info struct > + */ > +void tmu_setup_parameters(struct tmu_info *info) > +{ > + unsigned int te_temp, con; > + unsigned int warning_temp, trip_temp; > + unsigned int cooling_temp; > + unsigned int rising_value; > + struct tmu_data *data = &info->data; > + struct tmu_reg *reg = (struct tmu_reg *)info->tmu_base; > + > + /* Must reload for using efuse value at EXYNOS */ > + writel(TRIMINFO_RELOAD, ®->triminfo_control); > + > + /* Get the compensation parameter */ > + te_temp = readl(®->triminfo); > + info->te1 = te_temp & TRIM_INFO_MASK; > + info->te2 = ((te_temp >> 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_temp = data->ts.start_warning > + + info->te1 - info->dc_value; > + trip_temp = data->ts.start_tripping > + + info->te1 - info->dc_value; > + cooling_temp = 0; > + > + rising_value = ((warning_temp << 8) | (trip_temp << 16)); > + > + /* Set interrupt level */ > + writel(rising_value, ®->threshold_temp_rise); > + writel(cooling_temp, ®->threshold_temp_fall); > + > + /* > + * Need to init all regsiter setting after getting parameter info > + * [28:23] vref [11:8] slope - Tunning parameter > + */ > + writel(data->slope, ®->tmu_control); > + > + writel(INTCLEARALL, ®->intclear); > + /* TMU core enable */ > + con = readl(®->tmu_control); > + con |= (info->tmu_mux << 20) | CORE_EN; > + > + writel(con, ®->tmu_control); > + > + /* LEV0 LEV1 LEV2 interrupt enable */ > + writel(INTEN_RISE0 | 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) > + return -1; > + > + tmu_setup_parameters(&gbl_info); > + gbl_info.tmu_state = TMU_STATUS_NORMAL; > + puts("EXYNOS_TMU: Available\n"); Maybe this should be debug()? > + > + return 0; > +} > diff --git a/include/tmu.h b/include/tmu.h > new file mode 100644 > index 0000000..17e9a85 > --- /dev/null > +++ b/include/tmu.h > @@ -0,0 +1,46 @@ > +/* > + * Copyright (c) 2012 Samsung Electronics Co., Ltd. > + * http://www.samsung.com > + * Akshay Saraswat <akshay.s@samsung.com> > + * > + * 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 > + */ > + > +#ifndef _TMU_H > +#define _TMU_H > + > +enum tmu_status_t { > + TMU_STATUS_INIT = 0, > + TMU_STATUS_NORMAL, > + TMU_STATUS_WARNING, > + TMU_STATUS_TRIPPED, > +}; > + > +/* > + * 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 > + * and -1 on error > + */ > +enum tmu_status_t tmu_monitor(int *temp); > + > +/* > + * Initialize TMU device > + * > + * @param blob FDT blob > + * @return int value, 0 for success > + */ > +int tmu_init(const void *blob); > +#endif /* _THERMAL_H_ */ > -- > 1.7.9.5 > Regards, Simon
diff --git a/arch/arm/include/asm/arch-exynos/exynos-tmu.h b/arch/arm/include/asm/arch-exynos/exynos-tmu.h new file mode 100644 index 0000000..c79a520 --- /dev/null +++ b/arch/arm/include/asm/arch-exynos/exynos-tmu.h @@ -0,0 +1,58 @@ +/* + * 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 + */ + +#ifndef __ASM_ARCH_TMU_H +#define __ASM_ARCH_TMU_H + +struct tmu_reg { + unsigned triminfo; + unsigned rsvd1; + unsigned rsvd2; + unsigned rsvd3; + unsigned rsvd4; + unsigned triminfo_control; + unsigned rsvd5; + unsigned rsvd6; + unsigned tmu_control; + unsigned rsvd7; + unsigned tmu_status; + unsigned sampling_internal; + unsigned counter_value0; + unsigned counter_value1; + unsigned rsvd8; + unsigned rsvd9; + unsigned current_temp; + unsigned rsvd10; + unsigned rsvd11; + unsigned rsvd12; + unsigned threshold_temp_rise; + unsigned threshold_temp_fall; + unsigned rsvd13; + unsigned rsvd14; + unsigned past_temp3_0; + unsigned past_temp7_4; + unsigned past_temp11_8; + unsigned past_temp15_12; + unsigned inten; + unsigned intstat; + unsigned intclear; + unsigned rsvd15; + unsigned emul_con; +}; +#endif /* __ASM_ARCH_THERMAL_H */ diff --git a/drivers/power/Makefile b/drivers/power/Makefile index 8c71901..a5c7027 100644 --- a/drivers/power/Makefile +++ b/drivers/power/Makefile @@ -30,6 +30,7 @@ COBJS-$(CONFIG_TPS6586X_POWER) += tps6586x.o COBJS-$(CONFIG_TWL4030_POWER) += twl4030.o COBJS-$(CONFIG_TWL6030_POWER) += twl6030.o COBJS-$(CONFIG_TWL6035_POWER) += twl6035.o +COBJS-$(CONFIG_EXYNOS_TMU) += exynos-tmu.o COBJS-$(CONFIG_POWER) += power_core.o COBJS-$(CONFIG_DIALOG_POWER) += power_dialog.o diff --git a/drivers/power/exynos-tmu.c b/drivers/power/exynos-tmu.c new file mode 100644 index 0000000..c48fe28 --- /dev/null +++ b/drivers/power/exynos-tmu.c @@ -0,0 +1,297 @@ +/* + * 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/exynos-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; + /* 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 int te1; + /* value required for triminfo_85 calibration */ + unsigned int te2; + /* TMU DC value for threshold calculation */ + 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 + */ +int get_cur_temp(struct tmu_info *info) +{ + int cur_temp; + struct tmu_reg *reg = (struct tmu_reg *)info->tmu_base; + + /* Temperature code range between min 25 and max 125 */ + cur_temp = readl(®->current_temp) & 0xff; + + /* Calibrate current temperature */ + if (cur_temp) + 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) +{ + if (gbl_info.tmu_state == TMU_STATUS_INIT) + return TMU_STATUS_INIT; + + int cur_temp; + struct tmu_data *data = &gbl_info.data; + + /* 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; + /* Temperature code does not lie between min 25 and max 125 */ + else { + 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 + */ +int get_tmu_fdt_values(struct tmu_info *info, const void *blob) +{ + 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->tmu_mux = fdtdec_get_int(blob, + node, "samsung,mux", -1); + error |= info->tmu_mux; + 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; + } + + return 0; +} + +/* + * Calibrate and calculate threshold values and + * enable interrupt levels + * + * @param info pointer to the tmu_info struct + */ +void tmu_setup_parameters(struct tmu_info *info) +{ + unsigned int te_temp, con; + unsigned int warning_temp, trip_temp; + unsigned int cooling_temp; + unsigned int rising_value; + struct tmu_data *data = &info->data; + struct tmu_reg *reg = (struct tmu_reg *)info->tmu_base; + + /* Must reload for using efuse value at EXYNOS */ + writel(TRIMINFO_RELOAD, ®->triminfo_control); + + /* Get the compensation parameter */ + te_temp = readl(®->triminfo); + info->te1 = te_temp & TRIM_INFO_MASK; + info->te2 = ((te_temp >> 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_temp = data->ts.start_warning + + info->te1 - info->dc_value; + trip_temp = data->ts.start_tripping + + info->te1 - info->dc_value; + cooling_temp = 0; + + rising_value = ((warning_temp << 8) | (trip_temp << 16)); + + /* Set interrupt level */ + writel(rising_value, ®->threshold_temp_rise); + writel(cooling_temp, ®->threshold_temp_fall); + + /* + * Need to init all regsiter setting after getting parameter info + * [28:23] vref [11:8] slope - Tunning parameter + */ + writel(data->slope, ®->tmu_control); + + writel(INTCLEARALL, ®->intclear); + /* TMU core enable */ + con = readl(®->tmu_control); + con |= (info->tmu_mux << 20) | CORE_EN; + + writel(con, ®->tmu_control); + + /* LEV0 LEV1 LEV2 interrupt enable */ + writel(INTEN_RISE0 | 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) + return -1; + + tmu_setup_parameters(&gbl_info); + gbl_info.tmu_state = TMU_STATUS_NORMAL; + puts("EXYNOS_TMU: Available\n"); + + return 0; +} diff --git a/include/tmu.h b/include/tmu.h new file mode 100644 index 0000000..17e9a85 --- /dev/null +++ b/include/tmu.h @@ -0,0 +1,46 @@ +/* + * Copyright (c) 2012 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * Akshay Saraswat <akshay.s@samsung.com> + * + * 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 + */ + +#ifndef _TMU_H +#define _TMU_H + +enum tmu_status_t { + TMU_STATUS_INIT = 0, + TMU_STATUS_NORMAL, + TMU_STATUS_WARNING, + TMU_STATUS_TRIPPED, +}; + +/* + * 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 + * and -1 on error + */ +enum tmu_status_t tmu_monitor(int *temp); + +/* + * Initialize TMU device + * + * @param blob FDT blob + * @return int value, 0 for success + */ +int tmu_init(const void *blob); +#endif /* _THERMAL_H_ */
Adding Exynos Thermal Management Unit driver to monitor SOC temperature and take actions corresponding to states of TMU. Signed-off-by: Akshay Saraswat <akshay.s@samsung.com> --- Changes since v4: - Changed return value of get_cur_temp in case of 0 degree temp from -1 to TMU_STATUS_INIT because return value should be enum tmu_status_t. arch/arm/include/asm/arch-exynos/exynos-tmu.h | 58 +++++ drivers/power/Makefile | 1 + drivers/power/exynos-tmu.c | 297 +++++++++++++++++++++++++ include/tmu.h | 46 ++++ 4 files changed, 402 insertions(+) create mode 100644 arch/arm/include/asm/arch-exynos/exynos-tmu.h create mode 100644 drivers/power/exynos-tmu.c create mode 100644 include/tmu.h