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authorRob Herring <rob.herring@calxeda.com>2012-12-02 17:06:21 +0000
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2013-02-03 14:43:58 +0100
commit2ff467c05115c709decd7702cbc21679ac449519 (patch)
tree6d0144cce276706c0f8c2e52a5f034f6d33a4029
parentb0404ea1268540ebfe8c10b718990d82ee1d113f (diff)
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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>
-rw-r--r--arch/arm/include/asm/system.h6
1 files changed, 6 insertions, 0 deletions
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;