[U-Boot] [PATCH 1/2] ARM: add wfi assembly macro

From: Rob Herring rob.herring@calxeda.com

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

Signed-off-by: Rob Herring rob.herring@calxeda.com --- arch/arm/include/asm/system.h | 6 ++++++ 1 file changed, 6 insertions(+)

diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h index 2b28a26..2f6aecd 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;