EXYNOS: Add API for power reset and exit wakeup

This patch adds APIs to get power reset status and exit the wakeup condition for
both exynos5 and exynos4

Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

arch/arm/cpu/armv7/exynos/power.c

@@ -140,3 +140,53 @@ void set_hw_thermal_trip(void)
 		setbits_le32(&power->ps_hold_control, POWER_ENABLE_HW_TRIP);
 	}
 }
+
+static uint32_t exynos5_get_reset_status(void)
+{
+	struct exynos5_power *power =
+		(struct exynos5_power *)samsung_get_base_power();
+
+	return power->inform1;
+}
+
+static uint32_t exynos4_get_reset_status(void)
+{
+	struct exynos4_power *power =
+		(struct exynos4_power *)samsung_get_base_power();
+
+	return power->inform1;
+}
+
+uint32_t get_reset_status(void)
+{
+	if (cpu_is_exynos5())
+		return exynos5_get_reset_status();
+	else
+		return  exynos4_get_reset_status();
+}
+
+static void exynos5_power_exit_wakeup(void)
+{
+	struct exynos5_power *power =
+		(struct exynos5_power *)samsung_get_base_power();
+	typedef void (*resume_func)(void);
+
+	((resume_func)power->inform0)();
+}
+
+static void exynos4_power_exit_wakeup(void)
+{
+	struct exynos4_power *power =
+		(struct exynos4_power *)samsung_get_base_power();
+	typedef void (*resume_func)(void);
+
+	((resume_func)power->inform0)();
+}
+
+void power_exit_wakeup(void)
+{
+	if (cpu_is_exynos5())
+		exynos5_power_exit_wakeup();
+	else
+		exynos4_power_exit_wakeup();
+}

arch/arm/include/asm/arch-exynos/power.h

@@ -888,4 +888,16 @@ void set_ps_hold_ctrl(void);
  * source as XXTI
  */
 void set_xclkout(void);
+
+/*
+ *  Read inform1 to get the reset status.
+ *  @return: the value can be either S5P_CHECK_SLEEP or
+ *  S5P_CHECK_DIDLE or S5P_CHECK_LPA as stored in inform1
+ *  if none of these then its normal booting.
+ */
+uint32_t get_reset_status(void);
+
+
+/* Read the resume function and call it */
+void power_exit_wakeup(void);
 #endif