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/cpu.h> 8 #include <linux/module.h> 9 #include <linux/init.h> 10 #include <linux/mm.h> 11 #include <linux/pm.h> 12 #include <linux/tick.h> 13 #include <linux/preempt.h> 14 #include <linux/thread_info.h> 15 #include <linux/irqflags.h> 16 #include <linux/smp.h> 17 #include <linux/atomic.h> 18 #include <asm/smp.h> 19 #include <asm/bl_bit.h> 20 21 static void (*sh_idle)(void); 22 23 void default_idle(void) 24 { 25 set_bl_bit(); 26 raw_local_irq_enable(); 27 /* Isn't this racy ? */ 28 cpu_sleep(); 29 raw_local_irq_disable(); 30 clear_bl_bit(); 31 } 32 33 void __noreturn arch_cpu_idle_dead(void) 34 { 35 play_dead(); 36 } 37 38 void arch_cpu_idle(void) 39 { 40 sh_idle(); 41 } 42 43 void __init select_idle_routine(void) 44 { 45 /* 46 * If a platform has set its own idle routine, leave it alone. 47 */ 48 if (!sh_idle) 49 sh_idle = default_idle; 50 } 51 52 void stop_this_cpu(void *unused) 53 { 54 local_irq_disable(); 55 set_cpu_online(smp_processor_id(), false); 56 57 for (;;) 58 cpu_sleep(); 59 } 60