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72 lines
1.7 KiB
ArmAsm
72 lines
1.7 KiB
ArmAsm
/*
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* INCA-IP Watchdog timer management code.
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*
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* Copyright (c) 2003 Wolfgang Denk <wd@denx.de>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <config.h>
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#include <asm/regdef.h>
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#define WD_BASE 0xb8000000
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#define WD_CON0(value) 0x0020(value)
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#define WD_CON1(value) 0x0024(value)
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#define WD_DISABLE 0x00000008
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#define WD_ENABLE 0x00000000
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#define WD_WRITE_PW 0xFFFC00F8
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#define WD_WRITE_ENDINIT 0xFFFC00F3
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#define WD_WRITE_INIT 0xFFFC00F2
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.globl disable_incaip_wdt
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disable_incaip_wdt:
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li t0, WD_BASE
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/* Calculate password.
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*/
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lw t2, WD_CON1(t0)
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and t2, 0xC
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lw t3, WD_CON0(t0)
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and t3, 0xFFFFFF01
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or t3, t2
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or t3, 0xF0
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sw t3, WD_CON0(t0) /* write password */
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/* Clear ENDINIT.
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*/
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li t1, WD_WRITE_INIT
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sw t1, WD_CON0(t0)
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li t1, WD_DISABLE
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sw t1, WD_CON1(t0) /* disable watchdog */
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li t1, WD_WRITE_PW
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sw t1, WD_CON0(t0) /* write password */
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li t1, WD_WRITE_ENDINIT
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sw t1, WD_CON0(t0) /* end command */
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jr ra
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nop
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