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;