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/processor.h>
19 #include <asm/smp.h>
20 #include <asm/bl_bit.h>
21
22 static void (*sh_idle)(void);
23
24 void default_idle(void)
25 {
26 set_bl_bit();
27 raw_local_irq_enable();
28 /* Isn't this racy ? */
29 cpu_sleep();
30 raw_local_irq_disable();
31 clear_bl_bit();
32 }
33
34 void __noreturn arch_cpu_idle_dead(void)
35 {
36 play_dead();
37 }
38
39 void arch_cpu_idle(void)
40 {
41 sh_idle();
42 }
43
44 void __init select_idle_routine(void)
45 {
46 /*
47 * If a platform has set its own idle routine, leave it alone.
48 */
49 if (!sh_idle)
50 sh_idle = default_idle;
51 }
52
53 void stop_this_cpu(void *unused)
54 {
55 local_irq_disable();
56 set_cpu_online(smp_processor_id(), false);
57
58 for (;;)
59 cpu_sleep();
60 }
61
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