/* * (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 */