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
17 static 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
35 static 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
44 static 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
55 static 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
64 static 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
73 arch_initcall(mips_reboot_setup);
74
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