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1 | /* |
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 | ||
ad5bb451 WD |
36 | #include <post.h> |
37 | #include <watchdog.h> | |
38 | ||
6d0f6bcf | 39 | #if CONFIG_POST & CONFIG_SYS_POST_WATCHDOG |
ad5bb451 WD |
40 | |
41 | static ulong gettbl (void) | |
42 | { | |
43 | ulong r; | |
44 | ||
45 | asm ("mftbl %0":"=r" (r)); | |
46 | ||
47 | return r; | |
48 | } | |
49 | ||
50 | int watchdog_post_test (int flags) | |
51 | { | |
52 | if (flags & POST_REBOOT) { | |
53 | /* Test passed */ | |
54 | ||
55 | return 0; | |
56 | } else { | |
57 | /* 10-second delay */ | |
58 | int ints = disable_interrupts (); | |
59 | ulong base = gettbl (); | |
60 | ulong clk = get_tbclk (); | |
61 | ||
62 | while ((gettbl () - base) / 10 < clk); | |
63 | ||
64 | if (ints) | |
65 | enable_interrupts (); | |
66 | ||
67 | /* | |
68 | * If we have reached this point, the watchdog timer | |
69 | * does not work | |
70 | */ | |
71 | return -1; | |
72 | } | |
73 | } | |
74 | ||
6d0f6bcf | 75 | #endif /* CONFIG_POST & CONFIG_SYS_POST_WATCHDOG */ |