1 /*
2 * This program is free software; you can redistribute it and/or modify it
3 * under the terms of the GNU General Public License as published by the
4 * Free Software Foundation; either version 2 of the License, or (at your
5 * option) any later version.
6 *
7 * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
8 * Author: Fuxin Zhang, zhangfx@lemote.com
9 * Copyright (C) 2009 Lemote, Inc.
10 * Author: Zhangjin Wu, wuzhangjin@gmail.com
11 */
12 #include <linux/init.h>
13 #include <linux/pm.h>
14
15 #include <asm/idle.h>
16 #include <asm/reboot.h>
17
18 #include <loongson.h>
19 #include <boot_param.h>
20
loongson_reboot(void)21 static inline void loongson_reboot(void)
22 {
23 #ifndef CONFIG_CPU_JUMP_WORKAROUNDS
24 ((void (*)(void))ioremap_nocache(LOONGSON_BOOT_BASE, 4)) ();
25 #else
26 void (*func)(void);
27
28 func = (void *)ioremap_nocache(LOONGSON_BOOT_BASE, 4);
29
30 __asm__ __volatile__(
31 " .set noat \n"
32 " jr %[func] \n"
33 " .set at \n"
34 : /* No outputs */
35 : [func] "r" (func));
36 #endif
37 }
38
loongson_restart(char * command)39 static void loongson_restart(char *command)
40 {
41 #ifndef CONFIG_LEFI_FIRMWARE_INTERFACE
42 /* do preparation for reboot */
43 mach_prepare_reboot();
44
45 /* reboot via jumping to boot base address */
46 loongson_reboot();
47 #else
48 void (*fw_restart)(void) = (void *)loongson_sysconf.restart_addr;
49
50 fw_restart();
51 while (1) {
52 if (cpu_wait)
53 cpu_wait();
54 }
55 #endif
56 }
57
loongson_poweroff(void)58 static void loongson_poweroff(void)
59 {
60 #ifndef CONFIG_LEFI_FIRMWARE_INTERFACE
61 mach_prepare_shutdown();
62
63 /*
64 * It needs a wait loop here, but mips/kernel/reset.c already calls
65 * a generic delay loop, machine_hang(), so simply return.
66 */
67 return;
68 #else
69 void (*fw_poweroff)(void) = (void *)loongson_sysconf.poweroff_addr;
70
71 fw_poweroff();
72 while (1) {
73 if (cpu_wait)
74 cpu_wait();
75 }
76 #endif
77 }
78
loongson_halt(void)79 static void loongson_halt(void)
80 {
81 pr_notice("\n\n** You can safely turn off the power now **\n\n");
82 while (1) {
83 if (cpu_wait)
84 cpu_wait();
85 }
86 }
87
mips_reboot_setup(void)88 static int __init mips_reboot_setup(void)
89 {
90 _machine_restart = loongson_restart;
91 _machine_halt = loongson_halt;
92 pm_power_off = loongson_poweroff;
93
94 return 0;
95 }
96
97 arch_initcall(mips_reboot_setup);
98