1 /*
2 * (C) Copyright 2000, 2001
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4 *
5 * (C) Copyright 2007
6 * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com.
7 *
8 * See file CREDITS for list of people who contributed to this
9 * project.
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2 of
14 * the License, or (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
24 * MA 02111-1307 USA
25 */
26
27 #include <common.h>
28
29 /* Implemented by SPARC CPUs */
30 extern void cpu_wait_ticks(unsigned long ticks);
31 extern unsigned long cpu_usec2ticks(unsigned long usec);
32 extern unsigned long cpu_ticks2usec(unsigned long ticks);
33
34 /* ------------------------------------------------------------------------- */
35
wait_ticks(unsigned long ticks)36 void wait_ticks(unsigned long ticks)
37 {
38 cpu_wait_ticks(ticks);
39 }
40
41 /*
42 * This function is intended for SHORT delays only.
43 */
usec2ticks(unsigned long usec)44 unsigned long usec2ticks(unsigned long usec)
45 {
46 return cpu_usec2ticks(usec);
47 }
48
49 /* ------------------------------------------------------------------------- */
50
51 /*
52 * We implement the delay by converting the delay (the number of
53 * microseconds to wait) into a number of time base ticks; then we
54 * watch the time base until it has incremented by that amount.
55 */
__udelay(unsigned long usec)56 void __udelay(unsigned long usec)
57 {
58 ulong ticks = usec2ticks(usec);
59
60 wait_ticks(ticks);
61 }
62
63 /* ------------------------------------------------------------------------- */
64
ticks2usec(unsigned long ticks)65 unsigned long ticks2usec(unsigned long ticks)
66 {
67 return cpu_ticks2usec(ticks);
68 }
69
70 /* ------------------------------------------------------------------------- */
71
init_timebase(void)72 int init_timebase(void)
73 {
74
75 return (0);
76 }
77
78 /* ------------------------------------------------------------------------- */
79