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 clear_bl_bit(); 29 } 30 31 void arch_cpu_idle_dead(void) 32 { 33 play_dead(); 34 } 35 36 void arch_cpu_idle(void) 37 { 38 sh_idle(); 39 } 40 41 void __init select_idle_routine(void) 42 { 43 /* 44 * If a platform has set its own idle routine, leave it alone. 45 */ 46 if (!sh_idle) 47 sh_idle = default_idle; 48 } 49 50 void stop_this_cpu(void *unused) 51 { 52 local_irq_disable(); 53 set_cpu_online(smp_processor_id(), false); 54 55 for (;;) 56 cpu_sleep(); 57 } 58