From: Rob Herring <rob.herring@calxeda.com>
Date: Sun, 2 Dec 2012 17:06:21 +0000 (+0000)
Subject: ARM: add wfi assembly macro
X-Git-Tag: v2013.04-rc1~48^2~31
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2ff467c05115c709decd7702cbc21679ac449519;p=platform%2Fkernel%2Fu-boot.git

ARM: add wfi assembly macro

Since wfi instruction is only available on ARMv7, add a conditional
macro for it.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
---

diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index 78ca8e0..1918492 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -61,6 +61,12 @@
 
 #define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
 
+#ifdef __ARM_ARCH_7A__
+#define wfi() __asm__ __volatile__ ("wfi" : : : "memory")
+#else
+#define wfi()
+#endif
+
 static inline unsigned int get_cr(void)
 {
 	unsigned int val;