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/*
* (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.
*/
#include <post.h>
#include <watchdog.h>
#if CONFIG_POST & CONFIG_SYS_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 & CONFIG_SYS_POST_WATCHDOG */
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