sh: Add notifiers chains for cpu/board code

This patch adds atomic notifier chains for pre/post
sleep events. Useful for cpu code and boards that
need to save and restore register state before and
after entering a sleep mode.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/arch/sh/include/asm/suspend.h b/arch/sh/include/asm/suspend.h
index 5c8ea28ff7a4..d1cc5221645d 100644
--- a/arch/sh/include/asm/suspend.h
+++ b/arch/sh/include/asm/suspend.h
@@ -2,6 +2,7 @@
 #define _ASM_SH_SUSPEND_H
 
 #ifndef __ASSEMBLY__
+#include <linux/notifier.h>
 static inline int arch_prepare_suspend(void) { return 0; }
 
 #include <asm/ptrace.h>
@@ -19,6 +20,16 @@ void sh_mobile_setup_cpuidle(void);
 static inline void sh_mobile_setup_cpuidle(void) {}
 #endif
 
+/* notifier chains for pre/post sleep hooks */
+extern struct atomic_notifier_head sh_mobile_pre_sleep_notifier_list;
+extern struct atomic_notifier_head sh_mobile_post_sleep_notifier_list;
+
+/* priority levels for notifiers */
+#define SH_MOBILE_SLEEP_BOARD   0
+#define SH_MOBILE_SLEEP_CPU     1
+#define SH_MOBILE_PRE(x)        (x)
+#define SH_MOBILE_POST(x)       (-(x))
+
 #endif
 
 /* flags passed to assembly suspend code */