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wdenkc0218802003-03-27 12:09:35 +00001/*
2 * (C) Copyright 2003
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24#include <common.h>
25
26
27static inline void mips_compare_set(u32 v)
28{
29 asm volatile ("mtc0 %0, $11" : : "r" (v));
30}
31
32static inline void mips_count_set(u32 v)
33{
34 asm volatile ("mtc0 %0, $9" : : "r" (v));
35}
36
37
38static inline u32 mips_count_get(void)
39{
40 u32 count;
41
42 asm volatile ("mfc0 %0, $9" : "=r" (count) :);
43 return count;
44}
45
46/*
47 * timer without interrupts
48 */
49
50int timer_init(void)
51{
52 mips_compare_set(0);
53 mips_count_set(0);
54
55 return 0;
56}
57
58void reset_timer(void)
59{
60 mips_count_set(0);
61}
62
63ulong get_timer(ulong base)
64{
65 return mips_count_get() - base;
66}
67
68void set_timer(ulong t)
69{
70 mips_count_set(t);
71}
72
73void udelay (unsigned long usec)
74{
75 ulong tmo;
76 ulong start = get_timer(0);
77
wdenke0ac62d2003-08-17 18:55:18 +000078 tmo = usec * (CFG_HZ / 1000000);
wdenkc0218802003-03-27 12:09:35 +000079 while ((ulong)((mips_count_get() - start)) < tmo)
80 /*NOP*/;
81}
82
83/*
84 * This function is derived from PowerPC code (read timebase as long long).
85 * On MIPS it just returns the timer value.
86 */
87unsigned long long get_ticks(void)
88{
89 return mips_count_get();
90}
91
92/*
93 * This function is derived from PowerPC code (timebase clock frequency).
94 * On MIPS it returns the number of timer ticks per second.
95 */
96ulong get_tbclk(void)
97{
98 return CFG_HZ;
99}