1 /* 2 * The idle loop for all SuperH platforms. 3 * 4 * Copyright (C) 2002 - 2009 Paul Mundt 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file "COPYING" in the main directory of this archive 8 * for more details. 9 */ 10 #include <linux/module.h> 11 #include <linux/init.h> 12 #include <linux/mm.h> 13 #include <linux/pm.h> 14 #include <linux/tick.h> 15 #include <linux/preempt.h> 16 #include <linux/thread_info.h> 17 #include <linux/irqflags.h> 18 #include <linux/smp.h> 19 #include <linux/atomic.h> 20 #include <asm/pgalloc.h> 21 #include <asm/smp.h> 22 #include <asm/bl_bit.h> 23 24 static void (*sh_idle)(void); 25 26 void default_idle(void) 27 { 28 set_bl_bit(); 29 local_irq_enable(); 30 /* Isn't this racy ? */ 31 cpu_sleep(); 32 clear_bl_bit(); 33 } 34 35 void arch_cpu_idle_dead(void) 36 { 37 play_dead(); 38 } 39 40 void arch_cpu_idle(void) 41 { 42 sh_idle(); 43 } 44 45 void __init select_idle_routine(void) 46 { 47 /* 48 * If a platform has set its own idle routine, leave it alone. 49 */ 50 if (!sh_idle) 51 sh_idle = default_idle; 52 } 53 54 void stop_this_cpu(void *unused) 55 { 56 local_irq_disable(); 57 set_cpu_online(smp_processor_id(), false); 58 59 for (;;) 60 cpu_sleep(); 61 } 62