arch/mips/loongson32/common/reset.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (c) 2011 Zhang, Keguang <keguang.zhang@gmail.com>
   4  */
   5
   6 #include <linux/io.h>
   7 #include <linux/pm.h>
   8 #include <linux/sizes.h>
   9 #include <asm/idle.h>
  10 #include <asm/reboot.h>
  11
  12 #include <loongson1.h>
  13
  14 static void __iomem *wdt_reg_base;
  15
  16 static void ls1x_halt(void)
  17 {
  18         while (1) {
  19                 if (cpu_wait)
  20                         cpu_wait();
  21         }
  22 }
  23
  24 static void ls1x_restart(char *command)
  25 {
  26         __raw_writel(0x1, wdt_reg_base + WDT_EN);
  27         __raw_writel(0x1, wdt_reg_base + WDT_TIMER);
  28         __raw_writel(0x1, wdt_reg_base + WDT_SET);
  29
  30         ls1x_halt();
  31 }
  32
  33 static void ls1x_power_off(void)
  34 {
  35         ls1x_halt();
  36 }
  37
  38 static int __init ls1x_reboot_setup(void)
  39 {
  40         wdt_reg_base = ioremap_nocache(LS1X_WDT_BASE, (SZ_4 + SZ_8));
  41         if (!wdt_reg_base)
  42                 panic("Failed to remap watchdog registers");
  43
  44         _machine_restart = ls1x_restart;
  45         _machine_halt = ls1x_halt;
  46         pm_power_off = ls1x_power_off;
  47
  48         return 0;
  49 }
  50
  51 arch_initcall(ls1x_reboot_setup);