[U-Boot] [PATCH 3/8 v2] EXYNOS5: Power down API for Thermal Management Unit

[Hatim Ali]

From: Akshay Saraswat <akshay.s at samsung.com>

Adding API in power for system shutdown when tripping value is reached
in Exynos Thermal Management Unit.

Signed-off-by: Akshay Saraswat <akshay.s at samsung.com>
Acked-by: Simon Glass <sjg at chromium.org>
---
Changes since v1:
	- Changed description comment for power_shutdown function
	- Added Acked-by: Simon Glass

 arch/arm/cpu/armv7/exynos/power.c        |   15 +++++++++++++++
 arch/arm/include/asm/arch-exynos/power.h |    8 ++++++++
 2 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/arch/arm/cpu/armv7/exynos/power.c b/arch/arm/cpu/armv7/exynos/power.c
index d4bce6d..725c2d3 100644
--- a/arch/arm/cpu/armv7/exynos/power.c
+++ b/arch/arm/cpu/armv7/exynos/power.c
@@ -95,3 +95,18 @@ void set_dp_phy_ctrl(unsigned int enable)
 	if (cpu_is_exynos5())
 		exynos5_dp_phy_control(enable);
 }
+
+/*
+ * This function never returns.
+ * When called this function makes system hang and PAD driving value high
+ * which in turn makes system power down in case of cold reboot.
+ */
+void power_shutdown(void)
+{
+	struct exynos5_power *power =
+		(struct exynos5_power *)samsung_get_base_power();
+
+	clrbits_le32(&power->ps_hold_control, POWER_PS_HOLD_CONTROL_DATA_HIGH);
+
+	hang();
+}
diff --git a/arch/arm/include/asm/arch-exynos/power.h b/arch/arm/include/asm/arch-exynos/power.h
index d2fdb59..f069a0b 100644
--- a/arch/arm/include/asm/arch-exynos/power.h
+++ b/arch/arm/include/asm/arch-exynos/power.h
@@ -863,5 +863,13 @@ void set_usbhost_phy_ctrl(unsigned int enable);
 void set_dp_phy_ctrl(unsigned int enable);
 
 #define EXYNOS_DP_PHY_ENABLE		(1 << 0)
+#define POWER_PS_HOLD_CONTROL_DATA_HIGH         (1 << 8)
+
+/*
+ * This function never returns.
+ * When called this function makes system hang and PAD driving value high
+ * which in turn makes system power down in case of cold reboot.
+ */
+void power_shutdown(void) __attribute__ ((noreturn));
 
 #endif
-- 
1.7.2.3