LXR linux/arch/mips/lantiq/falcon/reset.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *
   4 * Copyright (C) 2012 Thomas Langer <thomas.langer@lantiq.com>
   5 * Copyright (C) 2012 John Crispin <john@phrozen.org>
   6 */
   7
   8#include <linux/init.h>
   9#include <linux/io.h>
  10#include <linux/pm.h>
  11#include <asm/reboot.h>
  12#include <linux/export.h>
  13
  14#include <lantiq_soc.h>
  15
  16/*
  17 * Dummy implementation.  Used to allow platform code to find out what
  18 * source was booted from
  19 */
  20unsigned char ltq_boot_select(void)
  21{
  22        return BS_SPI;
  23}
  24
  25#define BOOT_REG_BASE   (KSEG1 | 0x1F200000)
  26#define BOOT_PW1_REG    (BOOT_REG_BASE | 0x20)
  27#define BOOT_PW2_REG    (BOOT_REG_BASE | 0x24)
  28#define BOOT_PW1        0x4C545100
  29#define BOOT_PW2        0x0051544C
  30
  31#define WDT_REG_BASE    (KSEG1 | 0x1F8803F0)
  32#define WDT_PW1         0x00BE0000
  33#define WDT_PW2         0x00DC0000
  34
  35static void machine_restart(char *command)
  36{
  37        local_irq_disable();
  38
  39        /* reboot magic */
  40        ltq_w32(BOOT_PW1, (void *)BOOT_PW1_REG); /* 'LTQ\0' */
  41        ltq_w32(BOOT_PW2, (void *)BOOT_PW2_REG); /* '\0QTL' */
  42        ltq_w32(0, (void *)BOOT_REG_BASE); /* reset Bootreg RVEC */
  43
  44        /* watchdog magic */
  45        ltq_w32(WDT_PW1, (void *)WDT_REG_BASE);
  46        ltq_w32(WDT_PW2 |
  47                (0x3 << 26) | /* PWL */
  48                (0x2 << 24) | /* CLKDIV */
  49                (0x1 << 31) | /* enable */
  50                (1), /* reload */
  51                (void *)WDT_REG_BASE);
  52        unreachable();
  53}
  54
  55static void machine_halt(void)
  56{
  57        local_irq_disable();
  58        unreachable();
  59}
  60
  61static void machine_power_off(void)
  62{
  63        local_irq_disable();
  64        unreachable();
  65}
  66
  67static int __init mips_reboot_setup(void)
  68{
  69        _machine_restart = machine_restart;
  70        _machine_halt = machine_halt;
  71        pm_power_off = machine_power_off;
  72        return 0;
  73}
  74
  75arch_initcall(mips_reboot_setup);
  76