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128 lines
2.6 KiB
128 lines
2.6 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Idle daemon for PowerPC. Idle daemon will handle any action |
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* that needs to be taken when the system becomes idle. |
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* |
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* Originally written by Cort Dougan ([email protected]). |
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* Subsequent 32-bit hacking by Tom Rini, Armin Kuster, |
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* Paul Mackerras and others. |
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* |
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* iSeries supported added by Mike Corrigan <[email protected]> |
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* |
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* Additional shared processor, SMT, and firmware support |
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* Copyright (c) 2003 Dave Engebretsen <[email protected]> |
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* |
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* 32-bit and 64-bit versions merged by Paul Mackerras <[email protected]> |
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*/ |
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#include <linux/sched.h> |
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#include <linux/kernel.h> |
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#include <linux/smp.h> |
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#include <linux/cpu.h> |
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#include <linux/sysctl.h> |
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#include <linux/tick.h> |
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#include <asm/processor.h> |
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#include <asm/cputable.h> |
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#include <asm/time.h> |
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#include <asm/machdep.h> |
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#include <asm/runlatch.h> |
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#include <asm/smp.h> |
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unsigned long cpuidle_disable = IDLE_NO_OVERRIDE; |
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EXPORT_SYMBOL(cpuidle_disable); |
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static int __init powersave_off(char *arg) |
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{ |
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ppc_md.power_save = NULL; |
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cpuidle_disable = IDLE_POWERSAVE_OFF; |
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return 0; |
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} |
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__setup("powersave=off", powersave_off); |
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void arch_cpu_idle(void) |
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{ |
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ppc64_runlatch_off(); |
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if (ppc_md.power_save) { |
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ppc_md.power_save(); |
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/* |
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* Some power_save functions return with |
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* interrupts enabled, some don't. |
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*/ |
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if (irqs_disabled()) |
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raw_local_irq_enable(); |
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} else { |
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raw_local_irq_enable(); |
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/* |
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* Go into low thread priority and possibly |
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* low power mode. |
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*/ |
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HMT_low(); |
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HMT_very_low(); |
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} |
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HMT_medium(); |
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ppc64_runlatch_on(); |
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} |
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int powersave_nap; |
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#ifdef CONFIG_PPC_970_NAP |
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void power4_idle(void) |
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{ |
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if (!cpu_has_feature(CPU_FTR_CAN_NAP)) |
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return; |
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if (!powersave_nap) |
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return; |
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if (!prep_irq_for_idle()) |
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return; |
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if (cpu_has_feature(CPU_FTR_ALTIVEC)) |
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asm volatile("DSSALL ; sync" ::: "memory"); |
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power4_idle_nap(); |
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/* |
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* power4_idle_nap returns with interrupts enabled (soft and hard). |
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* to our caller with interrupts enabled (soft and hard). Our caller |
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* can cope with either interrupts disabled or enabled upon return. |
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*/ |
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} |
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#endif |
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#ifdef CONFIG_SYSCTL |
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/* |
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* Register the sysctl to set/clear powersave_nap. |
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*/ |
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static struct ctl_table powersave_nap_ctl_table[] = { |
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{ |
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.procname = "powersave-nap", |
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.data = &powersave_nap, |
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.maxlen = sizeof(int), |
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.mode = 0644, |
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.proc_handler = proc_dointvec, |
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}, |
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{} |
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}; |
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static struct ctl_table powersave_nap_sysctl_root[] = { |
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{ |
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.procname = "kernel", |
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.mode = 0555, |
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.child = powersave_nap_ctl_table, |
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}, |
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{} |
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}; |
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static int __init |
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register_powersave_nap_sysctl(void) |
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{ |
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register_sysctl_table(powersave_nap_sysctl_root); |
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return 0; |
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} |
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__initcall(register_powersave_nap_sysctl); |
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#endif
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