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f9913a8e YS |
1 | /* |
2 | * (C) Copyright 2007 | |
3 | * Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com> | |
4 | * | |
5 | * (C) Copyright 2007 | |
6 | * Nobobuhiro Iwamatsu <iwamatsu@nigauri.org> | |
7 | * | |
8 | * (C) Copyright 2003 | |
9 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
10 | * | |
11 | * See file CREDITS for list of people who contributed to this | |
12 | * project. | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License as | |
16 | * published by the Free Software Foundation; either version 2 of | |
17 | * the License, or (at your option) any later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
25 | * along with this program; if not, write to the Free Software | |
26 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
27 | * MA 02111-1307 USA | |
28 | */ | |
29 | ||
30 | #include <common.h> | |
31 | #include <asm/processor.h> | |
32 | #include <asm/io.h> | |
33 | ||
34 | #define TMU_MAX_COUNTER (~0UL) | |
35 | ||
36 | static void tmu_timer_start(unsigned int timer) | |
37 | { | |
38 | if (timer > 2) | |
39 | return; | |
40 | ||
41 | outb(inb(TSTR) | (1 << timer), TSTR); | |
42 | } | |
43 | ||
44 | static void tmu_timer_stop(unsigned int timer) | |
45 | { | |
46 | u8 val = inb(TSTR); | |
47 | ||
48 | if (timer > 2) | |
49 | return; | |
50 | outb(val & ~(1 << timer), TSTR); | |
51 | } | |
52 | ||
53 | int timer_init(void) | |
54 | { | |
55 | /* Divide clock by 4 */ | |
56 | outw(0, TCR0); | |
57 | ||
58 | tmu_timer_stop(0); | |
59 | tmu_timer_start(0); | |
60 | return 0; | |
61 | } | |
62 | ||
63 | /* | |
64 | In theory we should return a true 64bit value (ie something that doesn't | |
65 | overflow). However, we don't. Therefore if TMU runs at fastest rate of | |
66 | 6.75 MHz this value will wrap after u-boot has been running for approx | |
67 | 10 minutes. | |
68 | */ | |
69 | unsigned long long get_ticks(void) | |
70 | { | |
71 | return (0 - inl(TCNT0)); | |
72 | } | |
73 | ||
74 | unsigned long get_timer(unsigned long base) | |
75 | { | |
76 | return ((0 - inl(TCNT0)) - base); | |
77 | } | |
78 | ||
79 | void set_timer(unsigned long t) | |
80 | { | |
81 | outl(0 - t, TCNT0); | |
82 | } | |
83 | ||
84 | void reset_timer(void) | |
85 | { | |
86 | tmu_timer_stop(0); | |
87 | set_timer(0); | |
88 | tmu_timer_start(0); | |
89 | } | |
90 | ||
91 | void udelay(unsigned long usec) | |
92 | { | |
93 | unsigned int start = get_timer(0); | |
6d0f6bcf | 94 | unsigned int end = start + (usec * ((CONFIG_SYS_HZ + 500000) / 1000000)); |
f9913a8e YS |
95 | |
96 | while (get_timer(0) < end) | |
97 | continue; | |
98 | } | |
99 | ||
100 | unsigned long get_tbclk(void) | |
101 | { | |
6d0f6bcf | 102 | return CONFIG_SYS_HZ; |
f9913a8e | 103 | } |