2 * (C) Copyright 2000, 2001
3 * Erik Theisen, Wave 7 Optics, etheisen@mindspring.com.
5 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
7 * See file CREDITS for list of people who contributed to this
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.
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.
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,
26 #include <ppc_asm.tmpl>
32 * unsigned long long get_ticks(void);
34 * read timebase as "long long"
46 * Delay for a number of ticks
51 mflr r0 /* save link register */
52 stw r0, 20(r1) /* Use r0 or GDB will be unhappy */
53 stw r14, 12(r1) /* save used registers */
55 mr r14, r3 /* save tick count */
56 bl get_ticks /* Get start time */
58 /* Calculate end time */
59 addc r14, r4, r14 /* Compute end time lower */
60 addze r15, r3 /* and end time upper */
62 WATCHDOG_RESET /* Trigger watchdog, if needed */
63 1: bl get_ticks /* Get current time */
64 subfc r4, r4, r14 /* Subtract current time from end time */
66 bge 1b /* Loop until time expired */
68 lwz r15, 8(r1) /* restore saved registers */