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 
default_idle(void)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 
arch_cpu_idle_dead(void)32 void arch_cpu_idle_dead(void)
33 {
34 	play_dead();
35 }
36 
arch_cpu_idle(void)37 void arch_cpu_idle(void)
38 {
39 	sh_idle();
40 }
41 
select_idle_routine(void)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 
stop_this_cpu(void * unused)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