blob: 9e0b2a9290222d41bee031f0d4e5afe208f1323c [file] [log] [blame]
* (C) Copyright 2000, 2001
* Erik Theisen, Wave 7 Optics,
* base on code by
* Wolfgang Denk, DENX Software Engineering,
* 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
* 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., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301 USA
#include <ppc_asm.tmpl>
* unsigned long long _get_ticks(void);
.globl _get_ticks
1: mftbu r3
mftb r4
mftbu r5
cmpw 0,r3,r5
bne 1b
* Delay for a number of ticks
.globl _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 */
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 */