From c2eb5090ee531a50533ba9e739071c21f98a5a77 Mon Sep 17 00:00:00 2001 From: Haavard Skinnemoen Date: Mon, 4 Dec 2006 12:01:36 +0100 Subject: [PATCH] [AVR32] Put the chip in "stop" mode when halting the system Make machine_halt() execute a sleep instruction to put the chip in "stop" mode when the system is halted. This switches off all clocks except the 32 kHz oscillator, which is needed for the RTC to keep ticking. Signed-off-by: Haavard Skinnemoen --- arch/avr32/kernel/process.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/avr32/kernel/process.c b/arch/avr32/kernel/process.c index 317dc50945f2..0b4325946a41 100644 --- a/arch/avr32/kernel/process.c +++ b/arch/avr32/kernel/process.c @@ -38,6 +38,13 @@ void cpu_idle(void) void machine_halt(void) { + /* + * Enter Stop mode. The 32 kHz oscillator will keep running so + * the RTC will keep the time properly and the system will + * boot quickly. + */ + asm volatile("sleep 3\n\t" + "sub pc, -2"); } void machine_power_off(void)