sh: Add notifiers chains for cpu/board code

PATCH In review Magnus Damm 1 participant 1 message Oct 29, 2009

Subsystems (2)

SuperH Hibernation

lore

Share & tools

lore

Magnus Damm

author

2009-10-29 10:51 UTC #0 lore raw

PATCH 2/7 sh: Add notifiers chains for cpu/board code

From: Magnus Damm <[email protected]>

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 <[email protected]>

---

 arch/sh/include/asm/suspend.h    |   11 +++++++++++
 arch/sh/kernel/cpu/shmobile/pm.c |   12 ++++++++++++
 2 files changed, 23 insertions(+)

arch/sh/include/asm/suspend.h +11 -0

@@ -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 */

arch/sh/kernel/cpu/shmobile/pm.c +12 -0

@@ -17,6 +17,12 @@
 #include <asm/uaccess.h>
 
 /*
+ * Notifier lists for pre/post sleep notification
+ */
+ATOMIC_NOTIFIER_HEAD(sh_mobile_pre_sleep_notifier_list);
+ATOMIC_NOTIFIER_HEAD(sh_mobile_post_sleep_notifier_list);
+
+/*
  * Sleep modes available on SuperH Mobile:
  *
  * Sleep mode is just plain "sleep" instruction

@@ -44,8 +50,14 @@ void sh_mobile_call_standby(unsigned lon
 	void *onchip_mem = (void *)ILRAM_BASE;
 	void (*standby_onchip_mem)(unsigned long, unsigned long) = onchip_mem;
 
+	atomic_notifier_call_chain(&sh_mobile_pre_sleep_notifier_list,
+				   mode, NULL);
+
 	/* Let assembly snippet in on-chip memory handle the rest */
 	standby_onchip_mem(mode, ILRAM_BASE);
+
+	atomic_notifier_call_chain(&sh_mobile_post_sleep_notifier_list,
+				   mode, NULL);
 }
 
 static int sh_pm_enter(suspend_state_t state)