blob: 71adaa19dead2da699688885034291cd894ae780 [file] [log] [blame]
wdenkc0218802003-03-27 12:09:35 +00001/*
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
42disable_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 j ra
72 nop