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wdenk12e44072001-11-26 22:06:16 +00001/*
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:
Joakim Tjernlund83f83d12012-07-16 21:25:40 +000050 stwu r1, -16(r1)
51 mflr r0 /* save link register */
52 stw r0, 20(r1) /* Use r0 or GDB will be unhappy */
wdenk12e44072001-11-26 22:06:16 +000053 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
Joakim Tjernlund83f83d12012-07-16 21:25:40 +000066 mtlr r0 /* restore link register */
67 addi r1,r1,16
wdenk12e44072001-11-26 22:06:16 +000068 blr