1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * The idle loop for all SuperH platforms. 4 * 5 * Copyright (C) 2002 - 2009 Paul Mundt 6 */ 7 #include <linux/module.h> 8 #include <linux/init.h> 9 #include <linux/mm.h> 10 #include <linux/pm.h> 11 #include <linux/tick.h> 12 #include <linux/preempt.h> 13 #include <linux/thread_info.h> 14 #include <linux/irqflags.h> 15 #include <linux/smp.h> 16 #include <linux/atomic.h> 17 #include <asm/smp.h> 18 #include <asm/bl_bit.h> 19 20 static void (*sh_idle)(void); 21 22 void default_idle(void) 23 { 24 set_bl_bit(); 25 raw_local_irq_enable(); 26 /* Isn't this racy ? */ 27 cpu_sleep(); 28 raw_local_irq_disable(); 29 clear_bl_bit(); 30 } 31 32 void arch_cpu_idle_dead(void) 33 { 34 play_dead(); 35 } 36 37 void arch_cpu_idle(void) 38 { 39 sh_idle(); 40 } 41 42 void __init select_idle_routine(void) 43 { 44 /* 45 * If a platform has set its own idle routine, leave it alone. 46 */ 47 if (!sh_idle) 48 sh_idle = default_idle; 49 } 50 51 void stop_this_cpu(void *unused) 52 { 53 local_irq_disable(); 54 set_cpu_online(smp_processor_id(), false); 55 56 for (;;) 57 cpu_sleep(); 58 } 59