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authorHaavard Skinnemoen <hskinnemoen@atmel.com>2006-12-04 12:01:36 +0100
committerHaavard Skinnemoen <hskinnemoen@atmel.com>2006-12-08 13:06:23 +0100
commitc2eb5090ee531a50533ba9e739071c21f98a5a77 (patch)
tree921853eb78d2a2ab581fd989c3b3615948ad8a65
parent01cb087e747538d6a831c3ab370a1e1fd4538d5c (diff)
downloadblackbird-op-linux-c2eb5090ee531a50533ba9e739071c21f98a5a77.tar.gz
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[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 <hskinnemoen@atmel.com>
-rw-r--r--arch/avr32/kernel/process.c7
1 files changed, 7 insertions, 0 deletions
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)
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