/* * (C) Copyright 2000, 2001 * Erik Theisen, Wave 7 Optics, etheisen@mindspring.com. * base on code by * 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 <ppc_asm.tmpl> #include <ppc_defs.h> #include <config.h> #include <watchdog.h> /* * unsigned long long get_ticks(void); * * read timebase as "long long" */ .globl get_ticks get_ticks: 1: mftbu r3 mftb r4 mftbu r5 cmp 0,r3,r5 bne 1b blr /* * Delay for a number of ticks */ .globl wait_ticks wait_ticks: mflr r8 /* save link register */ mr r7, r3 /* save tick count */ bl get_ticks /* Get start time */ /* Calculate end time */ addc r7, r4, r7 /* Compute end time lower */ addze r6, r3 /* and end time upper */ WATCHDOG_RESET /* Trigger watchdog, if needed */ 1: bl get_ticks /* Get current time */ subfc r4, r4, r7 /* Subtract current time from end time */ subfe. r3, r3, r6 bge 1b /* Loop until time expired */ mtlr r8 /* restore link register */ blr