[ARM] 4903/1: [AT91] SAM9/CAP9 system shutdown

Enable system shutdown/power-off on AT91SAM9 and AT91CAP9 based boards.
This does not require power-management to be enabled, and the
pm_power_off method can be overridden in board-specific files if
necessary.

Signed-off-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 8 insertions, 0 deletions

diff --git a/arch/arm/mach-at91/at91sam9rl.c b/arch/arm/mach-at91/at91sam9rl.c
index 4813a35f6cf5..902c79893ec7 100644
--- a/arch/arm/mach-at91/at91sam9rl.c
+++ b/arch/arm/mach-at91/at91sam9rl.c
@@ -10,6 +10,7 @@
  */
 
 #include <linux/module.h>
+#include <linux/pm.h>
 
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
@@ -17,6 +18,7 @@
 #include <asm/arch/at91sam9rl.h>
 #include <asm/arch/at91_pmc.h>
 #include <asm/arch/at91_rstc.h>
+#include <asm/arch/at91_shdwc.h>
 
 #include "generic.h"
 #include "clock.h"
@@ -244,6 +246,11 @@ static void at91sam9rl_reset(void)
         at91_sys_write(AT91_RSTC_CR, AT91_RSTC_KEY | AT91_RSTC_PROCRST | AT91_RSTC_PERRST);
 }
 
+static void at91sam9rl_poweroff(void)
+{
+        at91_sys_write(AT91_SHDW_CR, AT91_SHDW_KEY | AT91_SHDW_SHDW);
+}
+
 
 /* --------------------------------------------------------------------
  *  AT91SAM9RL processor initialization
@@ -274,6 +281,7 @@ void __init at91sam9rl_initialize(unsigned long main_clock)
         iotable_init(at91sam9rl_sram_desc, ARRAY_SIZE(at91sam9rl_sram_desc));
 
         at91_arch_reset = at91sam9rl_reset;
+        pm_power_off = at91sam9rl_poweroff;
         at91_extern_irq = (1 << AT91SAM9RL_ID_IRQ0);
 
         /* Init clock subsystem */