LXR linux/arch/mips/pic32/common/reset.c

   1/*
   2 * Joshua Henderson <joshua.henderson@microchip.com>
   3 * Copyright (C) 2015 Microchip Technology Inc.  All rights reserved.
   4 *
   5 *  This program is free software; you can distribute it and/or modify it
   6 *  under the terms of the GNU General Public License (Version 2) as
   7 *  published by the Free Software Foundation.
   8 *
   9 *  This program is distributed in the hope it will be useful, but WITHOUT
  10 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12 *  for more details.
  13 */
  14#include <linux/init.h>
  15#include <linux/pm.h>
  16#include <asm/reboot.h>
  17#include <asm/mach-pic32/pic32.h>
  18
  19#define PIC32_RSWRST            0x10
  20
  21static void pic32_halt(void)
  22{
  23        while (1) {
  24                __asm__(".set push;\n"
  25                        ".set arch=r4000;\n"
  26                        "wait;\n"
  27                        ".set pop;\n"
  28                );
  29        }
  30}
  31
  32static void pic32_machine_restart(char *command)
  33{
  34        void __iomem *reg =
  35                ioremap(PIC32_BASE_RESET + PIC32_RSWRST, sizeof(u32));
  36
  37        pic32_syskey_unlock();
  38
  39        /* magic write/read */
  40        __raw_writel(1, reg);
  41        (void)__raw_readl(reg);
  42
  43        pic32_halt();
  44}
  45
  46static void pic32_machine_halt(void)
  47{
  48        local_irq_disable();
  49
  50        pic32_halt();
  51}
  52
  53static int __init mips_reboot_setup(void)
  54{
  55        _machine_restart = pic32_machine_restart;
  56        _machine_halt = pic32_machine_halt;
  57        pm_power_off = pic32_machine_halt;
  58
  59        return 0;
  60}
  61
  62arch_initcall(mips_reboot_setup);
  63