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074cff0d WD |
1 | /* |
2 | * (C) Copyright 2004 | |
3 | * DAVE Srl | |
4 | * http://www.dave-tech.it | |
5 | * http://www.wawnet.biz | |
6 | * mailto:info@wawnet.biz | |
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/hardware.h> | |
29 | ||
074cff0d WD |
30 | /* we always count down the max. */ |
31 | #define TIMER_LOAD_VAL 0xffff | |
32 | ||
33 | /* macro to read the 16 bit timer */ | |
34 | #define READ_TIMER (TCNTO1 & 0xffff) | |
35 | ||
36 | #ifdef CONFIG_USE_IRQ | |
37 | #error CONFIG_USE_IRQ NOT supported | |
074cff0d WD |
38 | #endif |
39 | ||
074cff0d WD |
40 | static ulong timestamp; |
41 | static ulong lastdec; | |
42 | ||
b54384e3 | 43 | int timer_init (void) |
074cff0d WD |
44 | { |
45 | TCFG0 = 0x000000E9; | |
46 | TCFG1 = 0x00000004; | |
47 | TCON = 0x00000900; | |
48 | TCNTB1 = TIMER_LOAD_VAL; | |
49 | TCMPB1 = 0; | |
50 | TCON = 0x00000B00; | |
51 | TCON = 0x00000900; | |
52 | ||
53 | ||
54 | lastdec = TCNTB1 = TIMER_LOAD_VAL; | |
55 | timestamp = 0; | |
56 | return 0; | |
57 | } | |
58 | ||
59 | /* | |
60 | * timer without interrupts | |
61 | */ | |
62 | ||
63 | void reset_timer (void) | |
64 | { | |
65 | reset_timer_masked (); | |
66 | } | |
67 | ||
68 | ulong get_timer (ulong base) | |
69 | { | |
70 | return get_timer_masked () - base; | |
71 | } | |
72 | ||
73 | void set_timer (ulong t) | |
74 | { | |
75 | timestamp = t; | |
76 | } | |
77 | ||
78 | void udelay (unsigned long usec) | |
79 | { | |
80 | ulong tmo; | |
81 | ||
82 | tmo = usec / 1000; | |
6d0f6bcf | 83 | tmo *= CONFIG_SYS_HZ; |
074cff0d WD |
84 | tmo /= 8; |
85 | ||
86 | tmo += get_timer (0); | |
87 | ||
88 | while (get_timer_masked () < tmo) | |
89 | /*NOP*/; | |
90 | } | |
91 | ||
92 | void reset_timer_masked (void) | |
93 | { | |
94 | /* reset time */ | |
95 | lastdec = READ_TIMER; | |
96 | timestamp = 0; | |
97 | } | |
98 | ||
99 | ulong get_timer_masked (void) | |
100 | { | |
101 | ulong now = READ_TIMER; | |
102 | ||
103 | if (lastdec >= now) { | |
104 | /* normal mode */ | |
105 | timestamp += lastdec - now; | |
106 | } else { | |
107 | /* we have an overflow ... */ | |
108 | timestamp += lastdec + TIMER_LOAD_VAL - now; | |
109 | } | |
110 | lastdec = now; | |
111 | ||
112 | return timestamp; | |
113 | } | |
114 | ||
115 | void udelay_masked (unsigned long usec) | |
116 | { | |
117 | ulong tmo; | |
101e8dfa WD |
118 | ulong endtime; |
119 | signed long diff; | |
074cff0d | 120 | |
101e8dfa WD |
121 | if (usec >= 1000) { |
122 | tmo = usec / 1000; | |
6d0f6bcf | 123 | tmo *= CONFIG_SYS_HZ; |
101e8dfa WD |
124 | tmo /= 8; |
125 | } else { | |
6d0f6bcf | 126 | tmo = usec * CONFIG_SYS_HZ; |
101e8dfa WD |
127 | tmo /= (1000*8); |
128 | } | |
074cff0d | 129 | |
101e8dfa | 130 | endtime = get_timer(0) + tmo; |
074cff0d | 131 | |
101e8dfa WD |
132 | do { |
133 | ulong now = get_timer_masked (); | |
134 | diff = endtime - now; | |
135 | } while (diff >= 0); | |
074cff0d | 136 | } |