1/* 2 * (C) Copyright 2000, 2001 3 * Erik Theisen, Wave 7 Optics, etheisen@mindspring.com. 4 * base on code by 5 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 6 * 7 * See file CREDITS for list of people who contributed to this 8 * project. 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License as 12 * published by the Free Software Foundation; either version 2 of 13 * the License, or (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 23 * MA 02111-1307 USA 24 */ 25 26#include <ppc_asm.tmpl> 27#include <ppc_defs.h> 28#include <config.h> 29#include <watchdog.h> 30 31/* 32 * unsigned long long get_ticks(void); 33 * 34 * read timebase as "long long" 35 */ 36 .globl get_ticks 37get_ticks: 381: mftbu r3 39 mftb r4 40 mftbu r5 41 cmp 0,r3,r5 42 bne 1b 43 blr 44 45/* 46 * Delay for a number of ticks 47 */ 48 .globl wait_ticks 49wait_ticks: 50 stwu r1, -16(r1) 51 mflr r0 /* save link register */ 52 stw r0, 20(r1) /* Use r0 or GDB will be unhappy */ 53 mr r7, r3 /* save tick count */ 54 bl get_ticks /* Get start time */ 55 56 /* Calculate end time */ 57 addc r7, r4, r7 /* Compute end time lower */ 58 addze r6, r3 /* and end time upper */ 59 60 WATCHDOG_RESET /* Trigger watchdog, if needed */ 611: bl get_ticks /* Get current time */ 62 subfc r4, r4, r7 /* Subtract current time from end time */ 63 subfe. r3, r3, r6 64 bge 1b /* Loop until time expired */ 65 66 mtlr r0 /* restore link register */ 67 addi r1,r1,16 68 blr 69