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0b135cfc | 1 | /* |
b02bad12 NI |
2 | * (C) Copyright 2007 |
3 | * Nobobuhiro Iwamatsu <iwamatsu@nigauri.org> | |
4 | * | |
0b135cfc NI |
5 | * (C) Copyright 2003 |
6 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
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 | #include <asm/processor.h> | |
29 | ||
30 | #define TMU_MAX_COUNTER (~0UL) | |
31 | ||
32 | static void tmu_timer_start (unsigned int timer) | |
33 | { | |
34 | if (timer > 2) | |
35 | return; | |
36 | ||
b02bad12 NI |
37 | *((volatile unsigned char *) TSTR) |= (1 << timer); |
38 | } | |
39 | ||
40 | static void tmu_timer_stop (unsigned int timer) | |
41 | { | |
42 | u8 val = *((volatile u8 *)TSTR); | |
43 | if (timer > 2) | |
44 | return; | |
45 | *((volatile unsigned char *)TSTR) = val &~(1 << timer); | |
0b135cfc NI |
46 | } |
47 | ||
48 | int timer_init (void) | |
49 | { | |
50 | /* Divide clock by 4 */ | |
51 | *(volatile u16 *)TCR0 = 0; | |
52 | ||
b02bad12 NI |
53 | tmu_timer_stop(0); |
54 | tmu_timer_start(0); | |
0b135cfc NI |
55 | return 0; |
56 | } | |
57 | ||
58 | /* | |
59 | In theory we should return a true 64bit value (ie something that doesn't | |
60 | overflow). However, we don't. Therefore if TMU runs at fastest rate of | |
61 | 6.75 MHz this value will wrap after u-boot has been running for approx | |
62 | 10 minutes. | |
63 | */ | |
64 | unsigned long long get_ticks (void) | |
65 | { | |
b02bad12 | 66 | return (0 - *((volatile u32 *) TCNT0)); |
0b135cfc NI |
67 | } |
68 | ||
69 | unsigned long get_timer (unsigned long base) | |
70 | { | |
b02bad12 | 71 | return ((0 - *((volatile u32 *) TCNT0)) - base); |
0b135cfc NI |
72 | } |
73 | ||
74 | void set_timer (unsigned long t) | |
75 | { | |
76 | *((volatile unsigned int *) TCNT0) = (0 - t); | |
77 | } | |
78 | ||
79 | void reset_timer (void) | |
80 | { | |
b02bad12 | 81 | tmu_timer_stop(0); |
0b135cfc | 82 | set_timer (0); |
b02bad12 | 83 | tmu_timer_start(0); |
0b135cfc NI |
84 | } |
85 | ||
86 | void udelay (unsigned long usec) | |
87 | { | |
88 | unsigned int start = get_timer (0); | |
b02bad12 | 89 | unsigned int end = start + (usec * ((CFG_HZ + 500000) / 1000000)); |
0b135cfc NI |
90 | |
91 | while (get_timer (0) < end) | |
92 | continue; | |
93 | } | |
94 | ||
95 | unsigned long get_tbclk (void) | |
96 | { | |
97 | return CFG_HZ; | |
98 | } |