reset.c

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/*
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
 * Author: Fuxin Zhang, [email protected]
 * Copyright (C) 2009 Lemote, Inc.
 * Author: Zhangjin Wu, [email protected]
 */
#include <linux/init.h>
#include <linux/pm.h>

#include <asm/reboot.h>

#include <loongson.h>

static inline void loongson_reboot(void)
{
#ifndef CONFIG_CPU_JUMP_WORKAROUNDS
    ((void (*)(void))ioremap_nocache(LOONGSON_BOOT_BASE, 4)) ();
#else
    void (*func)(void);

    func = (void *)ioremap_nocache(LOONGSON_BOOT_BASE, 4);

    __asm__ __volatile__(
    "       .set    noat                                            \n"
    "       jr      %[func]                                         \n"
    "       .set    at                                              \n"
    : /* No outputs */
    : [func] "r" (func));
#endif
}

static void loongson_restart(char *command)
{
    /* do preparation for reboot */
    mach_prepare_reboot();

    /* reboot via jumping to boot base address */
    loongson_reboot();
}

static void loongson_poweroff(void)
{
    mach_prepare_shutdown();
    unreachable();
}

static void loongson_halt(void)
{
    pr_notice("\n\n** You can safely turn off the power now **\n\n");
    while (1) {
        if (cpu_wait)
            cpu_wait();
    }
}

static int __init mips_reboot_setup(void)
{
    _machine_restart = loongson_restart;
    _machine_halt = loongson_halt;
    pm_power_off = loongson_poweroff;

    return 0;
}

arch_initcall(mips_reboot_setup);