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>
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@ -2,6 +2,7 @@
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#define _ASM_SH_SUSPEND_H
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#ifndef __ASSEMBLY__
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#include <linux/notifier.h>
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static inline int arch_prepare_suspend(void) { return 0; }
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#include <asm/ptrace.h>
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@ -19,6 +20,16 @@ void sh_mobile_setup_cpuidle(void);
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static inline void sh_mobile_setup_cpuidle(void) {}
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#endif
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/* notifier chains for pre/post sleep hooks */
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extern struct atomic_notifier_head sh_mobile_pre_sleep_notifier_list;
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extern struct atomic_notifier_head sh_mobile_post_sleep_notifier_list;
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/* priority levels for notifiers */
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#define SH_MOBILE_SLEEP_BOARD 0
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#define SH_MOBILE_SLEEP_CPU 1
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#define SH_MOBILE_PRE(x) (x)
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#define SH_MOBILE_POST(x) (-(x))
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#endif
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/* flags passed to assembly suspend code */
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@ -16,6 +16,12 @@
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#include <asm/suspend.h>
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#include <asm/uaccess.h>
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/*
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* Notifier lists for pre/post sleep notification
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*/
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ATOMIC_NOTIFIER_HEAD(sh_mobile_pre_sleep_notifier_list);
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ATOMIC_NOTIFIER_HEAD(sh_mobile_post_sleep_notifier_list);
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/*
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* Sleep modes available on SuperH Mobile:
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*
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@ -44,8 +50,14 @@ void sh_mobile_call_standby(unsigned long mode)
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void *onchip_mem = (void *)ILRAM_BASE;
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void (*standby_onchip_mem)(unsigned long, unsigned long) = onchip_mem;
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atomic_notifier_call_chain(&sh_mobile_pre_sleep_notifier_list,
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mode, NULL);
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/* Let assembly snippet in on-chip memory handle the rest */
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standby_onchip_mem(mode, ILRAM_BASE);
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atomic_notifier_call_chain(&sh_mobile_post_sleep_notifier_list,
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mode, NULL);
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}
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static int sh_pm_enter(suspend_state_t state)
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