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07c04875 WD |
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 | ||
36 | #ifdef CONFIG_POST | |
37 | ||
38 | #include <post.h> | |
39 | #include <watchdog.h> | |
40 | ||
41 | #if CONFIG_POST & CFG_POST_WATCHDOG | |
42 | ||
43 | static ulong gettbl (void) | |
44 | { | |
45 | ulong r; | |
46 | ||
47 | asm ("mftbl %0":"=r" (r)); | |
48 | ||
49 | return r; | |
50 | } | |
51 | ||
52 | int 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 | ||
8bde7f77 WD |
69 | /* |
70 | * If we have reached this point, the watchdog timer | |
07c04875 WD |
71 | * does not work |
72 | */ | |
73 | return -1; | |
74 | } | |
75 | } | |
76 | ||
77 | #endif /* CONFIG_POST & CFG_POST_WATCHDOG */ | |
78 | #endif /* CONFIG_POST */ |