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author | Jonas Bonn <jonas@southpole.se> | 2011-06-04 22:28:42 +0300 |
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committer | Jonas Bonn <jonas@southpole.se> | 2011-07-22 18:46:35 +0200 |
commit | 2a7be1160a7ccc8b53693ef793fccb4ad2e75bbc (patch) | |
tree | 9a5e78cf0884951ed17bf62ca292a106205f9e5e /arch/openrisc/kernel | |
parent | 09abb90107202d3b18cf5a69076a1d05d11244e6 (diff) | |
download | op-kernel-dev-2a7be1160a7ccc8b53693ef793fccb4ad2e75bbc.zip op-kernel-dev-2a7be1160a7ccc8b53693ef793fccb4ad2e75bbc.tar.gz |
OpenRISC: Idle/Power management
Minimal functionality...
Signed-off-by: Jonas Bonn <jonas@southpole.se>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/openrisc/kernel')
-rw-r--r-- | arch/openrisc/kernel/idle.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/arch/openrisc/kernel/idle.c b/arch/openrisc/kernel/idle.c new file mode 100644 index 0000000..d5bc5f8 --- /dev/null +++ b/arch/openrisc/kernel/idle.c @@ -0,0 +1,77 @@ +/* + * OpenRISC idle.c + * + * Linux architectural port borrowing liberally from similar works of + * others. All original copyrights apply as per the original source + * declaration. + * + * Modifications for the OpenRISC architecture: + * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> + * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * Idle daemon for or32. Idle daemon will handle any action + * that needs to be taken when the system becomes idle. + */ + +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/smp.h> +#include <linux/stddef.h> +#include <linux/unistd.h> +#include <linux/ptrace.h> +#include <linux/slab.h> +#include <linux/tick.h> + +#include <asm/pgtable.h> +#include <asm/uaccess.h> +#include <asm/system.h> +#include <asm/io.h> +#include <asm/processor.h> +#include <asm/mmu.h> +#include <asm/cache.h> +#include <asm/pgalloc.h> + +void (*powersave) (void) = NULL; + +static inline void pm_idle(void) +{ + barrier(); +} + +void cpu_idle(void) +{ + set_thread_flag(TIF_POLLING_NRFLAG); + + /* endless idle loop with no priority at all */ + while (1) { + tick_nohz_stop_sched_tick(1); + + while (!need_resched()) { + check_pgt_cache(); + rmb(); + + clear_thread_flag(TIF_POLLING_NRFLAG); + + local_irq_disable(); + /* Don't trace irqs off for idle */ + stop_critical_timings(); + if (!need_resched() && powersave != NULL) + powersave(); + start_critical_timings(); + local_irq_enable(); + set_thread_flag(TIF_POLLING_NRFLAG); + } + + tick_nohz_restart_sched_tick(); + preempt_enable_no_resched(); + schedule(); + preempt_disable(); + } +} |