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wdenk07c04872002-09-24 11:14:13 +00001/*
2 * (C) Copyright 2002
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24#include <common.h>
25
26/*
27 * Watchdog test
28 *
29 * The test verifies the watchdog timer operation.
30 * On the first iteration, the test routine disables interrupts and
31 * makes a 10-second delay. If the system does not reboot during this delay,
32 * the watchdog timer is not operational and the test fails. If the system
33 * reboots, on the second iteration the test routine reports a success.
34 */
35
36#ifdef CONFIG_POST
37
38#include <post.h>
39#include <watchdog.h>
40
41#if CONFIG_POST & CFG_POST_WATCHDOG
42
43static ulong gettbl (void)
44{
45 ulong r;
46
47 asm ("mftbl %0":"=r" (r));
48
49 return r;
50}
51
52int watchdog_post_test (int flags)
53{
54 if (flags & POST_REBOOT) {
55 /* Test passed */
56
57 return 0;
58 } else {
59 /* 10-second delay */
60 int ints = disable_interrupts ();
61 ulong base = gettbl ();
62 ulong clk = get_tbclk ();
63
64 while ((gettbl () - base) / 10 < clk);
65
66 if (ints)
67 enable_interrupts ();
68
69 /*
70 * If we have reached this point, the watchdog timer
71 * does not work
72 */
73 return -1;
74 }
75}
76
77#endif /* CONFIG_POST & CFG_POST_WATCHDOG */
78#endif /* CONFIG_POST */