Re: [U-Boot] [PATCH 2/8 v2] EXYNOS5: TMU: Add driver for Thermal Management Unit

Hi Hatim,

On Wed, Nov 7, 2012 at 5:08 AM, Hatim Ali hatim.rv@samsung.com wrote:

From: Akshay Saraswat akshay.s@samsung.com

Adding Exynos Thermal Management Unit driver to monitor SOC temperature and take actions corresponding to states of TMU. System will shutdown if tripping temperature is reached.

Signed-off-by: Akshay Saraswat akshay.s@samsung.com Acked-by: Simon Glass sjg@chromium.org

---

Changes since v1: - Added new generic header file include/tmu.h - Added Acked-by: Simon Glass

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(+), 0 deletions(-) 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/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..adfaf0d --- /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_THERMAL_H +#define __ASM_ARCH_THERMAL_H

Suggest renaming this to 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 6bf388c..192a7cb 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 := $(COBJS-y) SRCS := $(COBJS:.o=.c) diff --git a/drivers/power/exynos-tmu.c b/drivers/power/exynos-tmu.c new file mode 100644 index 0000000..ce71408 --- /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;

+/*

• • After reading temperature code from register, compensating
• • its value and calculating celsius temperatue,
• • get current temperatue.
• • @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(&reg->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 -1;
  

•   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 -1;
  

•   }
  

•   return 0;
  

+}

+/*

• • 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, &reg->triminfo_control);
  

•   /* Get the compensation parameter */
  

•   te_temp = readl(&reg->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, &reg->threshold_temp_rise);
  

•   writel(cooling_temp, &reg->threshold_temp_fall);
  

•   /*
  

•    * Need to init all regsiter setting after getting parameter info
  

•    * [28:23] vref [11:8] slope - Tunning parameter
  

•    */
  

•   writel(data->slope, &reg->tmu_control);
  

•   writel(INTCLEARALL, &reg->intclear);
  

•   /* TMU core enable */
  

•   con = readl(&reg->tmu_control);
  

•   con |= (info->tmu_mux << 20) | 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)
  

•           return -1;
  

•   tmu_setup_parameters(&gbl_info);
  

•   gbl_info.tmu_state = TMU_STATUS_NORMAL;
  

•   return 0;
  

+} diff --git a/include/tmu.h b/include/tmu.h new file mode 100644 index 0000000..ba813ce --- /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 _THERMAL_H +#define _THERMAL_H

The guard here should be _TMU_H I think.

+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_ */

1.7.2.3

Regards, Simon