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c021880a WD |
1 | /* |
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> | |
c7e38e41 | 25 | #include <asm/mipsregs.h> |
c021880a | 26 | |
a55d4817 SK |
27 | static unsigned long timestamp; |
28 | ||
29 | /* how many counter cycles in a jiffy */ | |
30 | #define CYCLES_PER_JIFFY (CFG_MIPS_TIMER_FREQ + CFG_HZ / 2) / CFG_HZ | |
31 | ||
c021880a WD |
32 | /* |
33 | * timer without interrupts | |
34 | */ | |
35 | ||
36 | int timer_init(void) | |
37 | { | |
a55d4817 SK |
38 | /* Set up the timer for the first expiration. */ |
39 | timestamp = 0; | |
40 | write_c0_compare(read_c0_count() + CYCLES_PER_JIFFY); | |
c021880a WD |
41 | |
42 | return 0; | |
43 | } | |
44 | ||
45 | void reset_timer(void) | |
46 | { | |
a55d4817 SK |
47 | timestamp = 0; |
48 | write_c0_compare(read_c0_count() + CYCLES_PER_JIFFY); | |
c021880a WD |
49 | } |
50 | ||
51 | ulong get_timer(ulong base) | |
52 | { | |
a55d4817 SK |
53 | unsigned int count; |
54 | unsigned int expirelo = read_c0_compare(); | |
55 | ||
56 | /* Check to see if we have missed any timestamps. */ | |
57 | count = read_c0_count(); | |
58 | while ((count - expirelo) < 0x7fffffff) { | |
59 | expirelo += CYCLES_PER_JIFFY; | |
60 | timestamp++; | |
61 | } | |
62 | write_c0_compare(expirelo); | |
63 | ||
64 | return (timestamp - base); | |
c021880a WD |
65 | } |
66 | ||
67 | void set_timer(ulong t) | |
68 | { | |
a55d4817 SK |
69 | timestamp = t; |
70 | write_c0_compare(read_c0_count() + CYCLES_PER_JIFFY); | |
c021880a WD |
71 | } |
72 | ||
199e4f65 | 73 | void udelay(unsigned long usec) |
c021880a | 74 | { |
199e4f65 | 75 | unsigned int tmo; |
c021880a | 76 | |
199e4f65 SK |
77 | tmo = read_c0_count() + (usec * (CFG_MIPS_TIMER_FREQ / 1000000)); |
78 | while ((tmo - read_c0_count()) < 0x7fffffff) | |
c021880a WD |
79 | /*NOP*/; |
80 | } | |
81 | ||
82 | /* | |
83 | * This function is derived from PowerPC code (read timebase as long long). | |
84 | * On MIPS it just returns the timer value. | |
85 | */ | |
86 | unsigned long long get_ticks(void) | |
87 | { | |
a55d4817 | 88 | return get_timer(0); |
c021880a WD |
89 | } |
90 | ||
91 | /* | |
92 | * This function is derived from PowerPC code (timebase clock frequency). | |
93 | * On MIPS it returns the number of timer ticks per second. | |
94 | */ | |
95 | ulong get_tbclk(void) | |
96 | { | |
97 | return CFG_HZ; | |
98 | } |