cpu/mips/incaip_wdt.S

   1 /*
   2  *  INCA-IP Watchdog timer management code.
   3  *
   4  *  Copyright (c) 2003  Wolfgang Denk <wd@denx.de>
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22  * MA 02111-1307 USA
  23  */
  24
  25
  26 #include <config.h>
  27 #include <version.h>
  28 #include <asm/regdef.h>
  29
  30
  31 #define WD_BASE            0xb8000000
  32 #define WD_CON0(value)     0x0020(value)
  33 #define WD_CON1(value)     0x0024(value)
  34 #define WD_DISABLE         0x00000008
  35 #define WD_ENABLE          0x00000000
  36 #define WD_WRITE_PW        0xFFFC00F8
  37 #define WD_WRITE_ENDINIT   0xFFFC00F3
  38 #define WD_WRITE_INIT      0xFFFC00F2
  39
  40
  41         .globl  disable_incaip_wdt
  42 disable_incaip_wdt:
  43         li      t0, WD_BASE
  44
  45         /* Calculate password.
  46          */
  47         lw      t2, WD_CON1(t0)
  48         and     t2, 0xC
  49
  50         lw      t3, WD_CON0(t0)
  51         and     t3, 0xFFFFFF01
  52
  53         or      t3, t2
  54         or      t3, 0xF0
  55
  56         sw      t3, WD_CON0(t0)         /* write password */
  57
  58         /* Clear ENDINIT.
  59          */
  60         li      t1, WD_WRITE_INIT
  61         sw      t1, WD_CON0(t0)
  62
  63
  64         li      t1, WD_DISABLE
  65         sw      t1, WD_CON1(t0)         /* disable watchdog */
  66         li      t1, WD_WRITE_PW
  67         sw      t1, WD_CON0(t0)         /* write password */
  68         li      t1, WD_WRITE_ENDINIT
  69         sw      t1, WD_CON0(t0)         /* end command */
  70
  71         jr      ra
  72         nop