1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
5 * Author: Fuxin Zhang, zhangfx@lemote.com
6 * Copyright (C) 2009 Lemote, Inc.
7 * Author: Zhangjin Wu, wuzhangjin@gmail.com
8 */
9#include <linux/init.h>
10#include <linux/pm.h>
11
12#include <asm/idle.h>
13#include <asm/reboot.h>
14
15#include <loongson.h>
16
17static inline void loongson_reboot(void)
18{
19#ifndef CONFIG_CPU_JUMP_WORKAROUNDS
20	((void (*)(void))ioremap(LOONGSON_BOOT_BASE, 4)) ();
21#else
22	void (*func)(void);
23
24	func = (void *)ioremap(LOONGSON_BOOT_BASE, 4);
25
26	__asm__ __volatile__(
27	"	.set	noat						\n"
28	"	jr	%[func]						\n"
29	"	.set	at						\n"
30	: /* No outputs */
31	: [func] "r" (func));
32#endif
33}
34
35static void loongson_restart(char *command)
36{
37	/* do preparation for reboot */
38	mach_prepare_reboot();
39
40	/* reboot via jumping to boot base address */
41	loongson_reboot();
42}
43
44static void loongson_poweroff(void)
45{
46	mach_prepare_shutdown();
47
48	/*
49	 * It needs a wait loop here, but mips/kernel/reset.c already calls
50	 * a generic delay loop, machine_hang(), so simply return.
51	 */
52	return;
53}
54
55static void loongson_halt(void)
56{
57	pr_notice("\n\n** You can safely turn off the power now **\n\n");
58	while (1) {
59		if (cpu_wait)
60			cpu_wait();
61	}
62}
63
64static int __init mips_reboot_setup(void)
65{
66	_machine_restart = loongson_restart;
67	_machine_halt = loongson_halt;
68	pm_power_off = loongson_poweroff;
69
70	return 0;
71}
72
73arch_initcall(mips_reboot_setup);
74