[AVR32] Put cpu in sleep 0 when idle.

This patch puts the CPU in sleep 0 when doing nothing, idle. This will
turn of the CPU clock and thus save power. The CPU is waken again when
an interrupt occurs.

Signed-off-by: Hans-Christian Egtvedt <hcegtvedt@atmel.com>
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/asm-avr32/thread_info.h b/include/asm-avr32/thread_info.h
index d1f5b35ebd54..a2e606dd4f4a 100644
--- a/include/asm-avr32/thread_info.h
+++ b/include/asm-avr32/thread_info.h
@@ -83,6 +83,7 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_SINGLE_STEP         6       /* single step after next break */
 #define TIF_MEMDIE              7
 #define TIF_RESTORE_SIGMASK     8       /* restore signal mask in do_signal */
+#define TIF_CPU_GOING_TO_SLEEP  9       /* CPU is entering sleep 0 mode */
 #define TIF_USERSPACE           31      /* true if FS sets userspace */
 
 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
@@ -94,6 +95,7 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_SINGLE_STEP        (1 << TIF_SINGLE_STEP)
 #define _TIF_MEMDIE             (1 << TIF_MEMDIE)
 #define _TIF_RESTORE_SIGMASK    (1 << TIF_RESTORE_SIGMASK)
+#define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP)
 
 /* XXX: These two masks must never span more than 16 bits! */
 /* work to do on interrupt/exception return */