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   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2
   3 /***************************************************************************
   4  *   Copyright (C) 2015 by Ivan Meleca                                     *
   5  *   ivan@artekit.eu                                                       *
   6  ***************************************************************************/
   7
   8         .text
   9         .cpu cortex-m0plus
  10         .code 16
  11         .thumb_func
  12
  13         .align  2
  14
  15         ldr             r3, wdog_cs1
  16         mov             r2, #127
  17         ldrb    r5, [r3]
  18         ldrb    r4, [r3, #1]
  19         and             r2, r5
  20         ldr             r5, unlock1
  21         ldrh    r0, [r3, #4]
  22         ldrh    r1, [r3, #6]
  23         strh    r5, [r3, #2]
  24         ldr             r5, unlock2
  25         strh    r5, [r3, #2]
  26         strb    r4, [r3, #1]
  27         strh    r0, [r3, #4]
  28         strh    r1, [r3, #6]
  29         strb    r2, [r3]
  30         bkpt    #0
  31
  32         .align  2
  33
  34 wdog_cs1:
  35         .word   0x40052000      // Watchdog Control and Status Register 1
  36 unlock1:
  37         .word   0x20C5          // 1st unlock word
  38 unlock2:
  39         .word   0x28D9          // 2nd unlock word