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author | wdenk <wdenk> | 2002-09-24 11:14:13 (GMT) |
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committer | wdenk <wdenk> | 2002-09-24 11:14:13 (GMT) |
commit | 07c04875868e53551f1827606db85d3603c88047 (patch) | |
tree | 0a235babdfd4267fbfed8cc0654bd877ef205313 /post/watchdog.c | |
parent | 3d818266d7fbec49ec6a39ba05da6f5dc9eca611 (diff) | |
download | u-boot-07c04875868e53551f1827606db85d3603c88047.tar.xz |
Initial revision
Diffstat (limited to 'post/watchdog.c')
-rw-r--r-- | post/watchdog.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/post/watchdog.c b/post/watchdog.c new file mode 100644 index 0000000..0cdfbf0 --- /dev/null +++ b/post/watchdog.c @@ -0,0 +1,78 @@ +/* + * (C) Copyright 2002 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> + +/* + * Watchdog test + * + * The test verifies the watchdog timer operation. + * On the first iteration, the test routine disables interrupts and + * makes a 10-second delay. If the system does not reboot during this delay, + * the watchdog timer is not operational and the test fails. If the system + * reboots, on the second iteration the test routine reports a success. + */ + +#ifdef CONFIG_POST + +#include <post.h> +#include <watchdog.h> + +#if CONFIG_POST & CFG_POST_WATCHDOG + +static ulong gettbl (void) +{ + ulong r; + + asm ("mftbl %0":"=r" (r)); + + return r; +} + +int watchdog_post_test (int flags) +{ + if (flags & POST_REBOOT) { + /* Test passed */ + + return 0; + } else { + /* 10-second delay */ + int ints = disable_interrupts (); + ulong base = gettbl (); + ulong clk = get_tbclk (); + + while ((gettbl () - base) / 10 < clk); + + if (ints) + enable_interrupts (); + + /* + * If we have reached this point, the watchdog timer + * does not work + */ + return -1; + } +} + +#endif /* CONFIG_POST & CFG_POST_WATCHDOG */ +#endif /* CONFIG_POST */ |