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

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Joshua Henderson <joshua.henderson@microchip.com>
   4 * Copyright (C) 2015 Microchip Technology Inc.  All rights reserved.
   5 */
   6#include <linux/init.h>
   7#include <linux/pm.h>
   8#include <asm/reboot.h>
   9#include <asm/mach-pic32/pic32.h>
  10
  11#define PIC32_RSWRST            0x10
  12
  13static void pic32_halt(void)
  14{
  15        while (1) {
  16                __asm__(".set push;\n"
  17                        ".set arch=r4000;\n"
  18                        "wait;\n"
  19                        ".set pop;\n"
  20                );
  21        }
  22}
  23
  24static void pic32_machine_restart(char *command)
  25{
  26        void __iomem *reg =
  27                ioremap(PIC32_BASE_RESET + PIC32_RSWRST, sizeof(u32));
  28
  29        pic32_syskey_unlock();
  30
  31        /* magic write/read */
  32        __raw_writel(1, reg);
  33        (void)__raw_readl(reg);
  34
  35        pic32_halt();
  36}
  37
  38static void pic32_machine_halt(void)
  39{
  40        local_irq_disable();
  41
  42        pic32_halt();
  43}
  44
  45static int __init mips_reboot_setup(void)
  46{
  47        _machine_restart = pic32_machine_restart;
  48        _machine_halt = pic32_machine_halt;
  49        pm_power_off = pic32_machine_halt;
  50
  51        return 0;
  52}
  53
  54arch_initcall(mips_reboot_setup);
  55