--- /dev/null
+/*
+ * 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>
+
+#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(®->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, ®->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;
+ cooling_temp = 0;
+
+ rising_value = ((warning_code << 8) | (trip_code << 16));
+
+ /* 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 |= 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)
+ goto ret;
+
+ tmu_setup_parameters(&gbl_info);
+ gbl_info.tmu_state = TMU_STATUS_NORMAL;
+ret:
+
+ return gbl_info.tmu_state;
+}
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