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[AVR32] Put cpu in sleep 0 when idle.

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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 <[email protected]>
Signed-off-by: Haavard Skinnemoen <[email protected]>
This commit is contained in:
Hans-Christian Egtvedt 2007-02-26 13:50:43 +01:00 • committed by Haavard Skinnemoen
commit 19b7ce8bad
3 changed files with 42 additions and 7 deletions
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2
include/asm-avr32/thread_info.h
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@ -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 */