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Diffstat (limited to '')
-rw-r--r-- | arch/powerpc/kernel/idle.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/idle.c b/arch/powerpc/kernel/idle.c new file mode 100644 index 000000000..ca79aacfe --- /dev/null +++ b/arch/powerpc/kernel/idle.c @@ -0,0 +1,115 @@ +/* + * Idle daemon for PowerPC. Idle daemon will handle any action + * that needs to be taken when the system becomes idle. + * + * Originally written by Cort Dougan (cort@cs.nmt.edu). + * Subsequent 32-bit hacking by Tom Rini, Armin Kuster, + * Paul Mackerras and others. + * + * iSeries supported added by Mike Corrigan <mikejc@us.ibm.com> + * + * Additional shared processor, SMT, and firmware support + * Copyright (c) 2003 Dave Engebretsen <engebret@us.ibm.com> + * + * 32-bit and 64-bit versions merged by Paul Mackerras <paulus@samba.org> + * + * 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. + */ + +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/smp.h> +#include <linux/cpu.h> +#include <linux/sysctl.h> +#include <linux/tick.h> + +#include <asm/processor.h> +#include <asm/cputable.h> +#include <asm/time.h> +#include <asm/machdep.h> +#include <asm/runlatch.h> +#include <asm/smp.h> + + +unsigned long cpuidle_disable = IDLE_NO_OVERRIDE; +EXPORT_SYMBOL(cpuidle_disable); + +static int __init powersave_off(char *arg) +{ + ppc_md.power_save = NULL; + cpuidle_disable = IDLE_POWERSAVE_OFF; + return 1; +} +__setup("powersave=off", powersave_off); + +#ifdef CONFIG_HOTPLUG_CPU +void arch_cpu_idle_dead(void) +{ + sched_preempt_enable_no_resched(); + cpu_die(); +} +#endif + +void arch_cpu_idle(void) +{ + ppc64_runlatch_off(); + + if (ppc_md.power_save) { + ppc_md.power_save(); + /* + * Some power_save functions return with + * interrupts enabled, some don't. + */ + if (irqs_disabled()) + local_irq_enable(); + } else { + local_irq_enable(); + /* + * Go into low thread priority and possibly + * low power mode. + */ + HMT_low(); + HMT_very_low(); + } + + HMT_medium(); + ppc64_runlatch_on(); +} + +int powersave_nap; + +#ifdef CONFIG_SYSCTL +/* + * Register the sysctl to set/clear powersave_nap. + */ +static struct ctl_table powersave_nap_ctl_table[] = { + { + .procname = "powersave-nap", + .data = &powersave_nap, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + {} +}; +static struct ctl_table powersave_nap_sysctl_root[] = { + { + .procname = "kernel", + .mode = 0555, + .child = powersave_nap_ctl_table, + }, + {} +}; + +static int __init +register_powersave_nap_sysctl(void) +{ + register_sysctl_table(powersave_nap_sysctl_root); + + return 0; +} +__initcall(register_powersave_nap_sysctl); +#endif |