2 * (C) Copyright 2000, 2001
3 * Erik Theisen, Wave 7 Optics, etheisen@mindspring.com.
5 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
7 * SPDX-License-Identifier: GPL-2.0+
10 #include <ppc_asm.tmpl>
16 * unsigned long long get_ticks(void);
18 * read timebase as "long long"
30 * Delay for a number of ticks
35 mflr r0 /* save link register */
36 stw r0, 20(r1) /* Use r0 or GDB will be unhappy */
37 stw r14, 12(r1) /* save used registers */
39 mr r14, r3 /* save tick count */
40 bl get_ticks /* Get start time */
42 /* Calculate end time */
43 addc r14, r4, r14 /* Compute end time lower */
44 addze r15, r3 /* and end time upper */
46 WATCHDOG_RESET /* Trigger watchdog, if needed */
47 1: bl get_ticks /* Get current time */
48 subfc r4, r4, r14 /* Subtract current time from end time */
50 bge 1b /* Loop until time expired */
52 lwz r15, 8(r1) /* restore saved registers */