arch/mips/cpu/mips32/incaip/incaip_wdt.S

   1 /*
   2  *  INCA-IP Watchdog timer management code.
   3  *
   4  *  Copyright (c) 2003  Wolfgang Denk <wd@denx.de>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9
  10 #include <config.h>
  11 #include <asm/regdef.h>
  12
  13
  14 #define WD_BASE            0xb8000000
  15 #define WD_CON0(value)     0x0020(value)
  16 #define WD_CON1(value)     0x0024(value)
  17 #define WD_DISABLE         0x00000008
  18 #define WD_ENABLE          0x00000000
  19 #define WD_WRITE_PW        0xFFFC00F8
  20 #define WD_WRITE_ENDINIT   0xFFFC00F3
  21 #define WD_WRITE_INIT      0xFFFC00F2
  22
  23
  24         .globl  disable_incaip_wdt
  25 disable_incaip_wdt:
  26         li      t0, WD_BASE
  27
  28         /* Calculate password.
  29          */
  30         lw      t2, WD_CON1(t0)
  31         and     t2, 0xC
  32
  33         lw      t3, WD_CON0(t0)
  34         and     t3, 0xFFFFFF01
  35
  36         or      t3, t2
  37         or      t3, 0xF0
  38
  39         sw      t3, WD_CON0(t0)         /* write password */
  40
  41         /* Clear ENDINIT.
  42          */
  43         li      t1, WD_WRITE_INIT
  44         sw      t1, WD_CON0(t0)
  45
  46
  47         li      t1, WD_DISABLE
  48         sw      t1, WD_CON1(t0)         /* disable watchdog */
  49         li      t1, WD_WRITE_PW
  50         sw      t1, WD_CON0(t0)         /* write password */
  51         li      t1, WD_WRITE_ENDINIT
  52         sw      t1, WD_CON0(t0)         /* end command */
  53
  54         jr      ra
  55         nop