Adding Exynos Thermal Management Unit driver to monitor SOC
temperature and take actions corresponding to states of TMU.

Signed-off-by: Akshay Saraswat <aksha...@samsung.com>
Acked-by: Simon Glass <s...@chromium.org>
---
Changes since v10:
        - Renamed as/asch/exynos-tmu.h to asm/arch/tmu.h.

 arch/arm/include/asm/arch-exynos/tmu.h |  58 +++++++
 drivers/power/Makefile                 |   1 +
 drivers/power/exynos-tmu.c             | 304 +++++++++++++++++++++++++++++++++
 include/tmu.h                          |  46 +++++
 4 files changed, 409 insertions(+)
 create mode 100644 arch/arm/include/asm/arch-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/tmu.h 
b/arch/arm/include/asm/arch-exynos/tmu.h
new file mode 100644
index 0000000..31399b0
--- /dev/null
+++ b/arch/arm/include/asm/arch-exynos/tmu.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ *      http://www.samsung.com
+ * Akshay Saraswat <aksha...@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 exynos5_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_TMU_H */
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index 8c71901..1dac16a 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -25,6 +25,7 @@ include $(TOPDIR)/config.mk
 
 LIB    := $(obj)libpower.o
 
+COBJS-$(CONFIG_EXYNOS_TMU)     += exynos-tmu.o
 COBJS-$(CONFIG_FTPMU010_POWER) += ftpmu010.o
 COBJS-$(CONFIG_TPS6586X_POWER) += tps6586x.o
 COBJS-$(CONFIG_TWL4030_POWER)  += twl4030.o
diff --git a/drivers/power/exynos-tmu.c b/drivers/power/exynos-tmu.c
new file mode 100644
index 0000000..cc5ffee
--- /dev/null
+++ b/drivers/power/exynos-tmu.c
@@ -0,0 +1,304 @@
+/*
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ *      http://www.samsung.com
+ * Akshay Saraswat <aksha...@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>
+
+#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;
+       /* 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.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;
+       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;
+       cooling_temp = 0;
+
+       rising_value = ((warning_code << 8) | (trip_code << 16));
+
+       /* 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 |= 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)
+               goto ret;
+
+       tmu_setup_parameters(&gbl_info);
+       gbl_info.tmu_state = TMU_STATUS_NORMAL;
+ret:
+
+       return gbl_info.tmu_state;
+}
diff --git a/include/tmu.h b/include/tmu.h
new file mode 100644
index 0000000..da07a22
--- /dev/null
+++ b/include/tmu.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ *      http://www.samsung.com
+ * Akshay Saraswat <aksha...@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 = -1,
+       TMU_STATUS_NORMAL = 0,
+       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_ */
-- 
1.8.0

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