| 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(), online: false); |
| 57 | |
| 58 | for (;;) |
| 59 | cpu_sleep(); |
| 60 | } |
| 61 |