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sh: Add notifiers chains for cpu/board code

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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>
This commit is contained in:
Magnus Damm 2009-10-29 10:51:48 +00:00 committed by Paul Mundt
parent eb3118f652
commit 49f42644fd
2 changed files with 23 additions and 0 deletions
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11
arch/sh/include/asm/suspend.h
View file

@ -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 */

12
arch/sh/kernel/cpu/shmobile/pm.c
View file

@ -16,6 +16,12 @@
#include <asm/suspend.h>
#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:
*
@ -44,8 +50,14 @@ void sh_mobile_call_standby(unsigned long mode)
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)