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f39748ae WD |
1 | /* |
2 | * (C) Copyright 2002 | |
3 | * Sysgo Real-Time Solutions, GmbH <www.elinos.com> | |
4 | * Marius Groeger <mgroeger@sysgo.de> | |
5 | * | |
6 | * (C) Copyright 2002 | |
7 | * Sysgo Real-Time Solutions, GmbH <www.elinos.com> | |
8 | * Alex Zuepke <azu@sysgo.de> | |
9 | * | |
10 | * (C) Copyright 2002 | |
792a09eb | 11 | * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de> |
f39748ae WD |
12 | * |
13 | * See file CREDITS for list of people who contributed to this | |
14 | * project. | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or | |
17 | * modify it under the terms of the GNU General Public License as | |
18 | * published by the Free Software Foundation; either version 2 of | |
19 | * the License, or (at your option) any later version. | |
20 | * | |
21 | * This program is distributed in the hope that it will be useful, | |
22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24 | * GNU General Public License for more details. | |
25 | * | |
26 | * You should have received a copy of the GNU General Public License | |
27 | * along with this program; if not, write to the Free Software | |
28 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
29 | * MA 02111-1307 USA | |
30 | */ | |
31 | ||
32 | #include <common.h> | |
f39748ae WD |
33 | #include <lh7a40x.h> |
34 | ||
f39748ae WD |
35 | static ulong timer_load_val = 0; |
36 | ||
37 | /* macro to read the 16 bit timer */ | |
38 | static inline ulong READ_TIMER(void) | |
39 | { | |
f832d8a1 | 40 | lh7a40x_timers_t* timers = LH7A40X_TIMERS_PTR; |
f39748ae WD |
41 | lh7a40x_timer_t* timer = &timers->timer1; |
42 | ||
43 | return (timer->value & 0x0000ffff); | |
44 | } | |
45 | ||
f39748ae WD |
46 | static ulong timestamp; |
47 | static ulong lastdec; | |
48 | ||
b54384e3 | 49 | int timer_init (void) |
f39748ae | 50 | { |
f832d8a1 | 51 | lh7a40x_timers_t* timers = LH7A40X_TIMERS_PTR; |
f39748ae WD |
52 | lh7a40x_timer_t* timer = &timers->timer1; |
53 | ||
54 | /* a periodic timer using the 508kHz source */ | |
55 | timer->control = (TIMER_PER | TIMER_CLK508K); | |
56 | ||
57 | if (timer_load_val == 0) { | |
58 | /* | |
59 | * 10ms period with 508.469kHz clock = 5084 | |
60 | */ | |
6d0f6bcf | 61 | timer_load_val = CONFIG_SYS_HZ/100; |
f39748ae WD |
62 | } |
63 | ||
64 | /* load value for 10 ms timeout */ | |
65 | lastdec = timer->load = timer_load_val; | |
66 | ||
67 | /* auto load, start timer */ | |
68 | timer->control = timer->control | TIMER_EN; | |
69 | timestamp = 0; | |
70 | ||
71 | return (0); | |
72 | } | |
73 | ||
74 | /* | |
75 | * timer without interrupts | |
76 | */ | |
f39748ae WD |
77 | ulong get_timer (ulong base) |
78 | { | |
79 | return (get_timer_masked() - base); | |
80 | } | |
81 | ||
3eb90bad | 82 | void __udelay (unsigned long usec) |
f39748ae WD |
83 | { |
84 | ulong tmo,tmp; | |
85 | ||
86 | /* normalize */ | |
87 | if (usec >= 1000) { | |
88 | tmo = usec / 1000; | |
6d0f6bcf | 89 | tmo *= CONFIG_SYS_HZ; |
f39748ae WD |
90 | tmo /= 1000; |
91 | } | |
92 | else { | |
93 | if (usec > 1) { | |
6d0f6bcf | 94 | tmo = usec * CONFIG_SYS_HZ; |
f39748ae WD |
95 | tmo /= (1000*1000); |
96 | } | |
97 | else | |
98 | tmo = 1; | |
99 | } | |
100 | ||
101 | /* check for rollover during this delay */ | |
102 | tmp = get_timer (0); | |
103 | if ((tmp + tmo) < tmp ) | |
104 | reset_timer_masked(); /* timer would roll over */ | |
105 | else | |
106 | tmo += tmp; | |
107 | ||
108 | while (get_timer_masked () < tmo); | |
109 | } | |
110 | ||
111 | void reset_timer_masked (void) | |
112 | { | |
113 | /* reset time */ | |
114 | lastdec = READ_TIMER(); | |
115 | timestamp = 0; | |
116 | } | |
117 | ||
118 | ulong get_timer_masked (void) | |
119 | { | |
120 | ulong now = READ_TIMER(); | |
121 | ||
122 | if (lastdec >= now) { | |
123 | /* normal mode */ | |
124 | timestamp += (lastdec - now); | |
125 | } else { | |
126 | /* we have an overflow ... */ | |
127 | timestamp += ((lastdec + timer_load_val) - now); | |
128 | } | |
129 | lastdec = now; | |
130 | ||
131 | return timestamp; | |
132 | } | |
133 | ||
134 | void udelay_masked (unsigned long usec) | |
135 | { | |
136 | ulong tmo; | |
101e8dfa WD |
137 | ulong endtime; |
138 | signed long diff; | |
f39748ae WD |
139 | |
140 | /* normalize */ | |
141 | if (usec >= 1000) { | |
142 | tmo = usec / 1000; | |
6d0f6bcf | 143 | tmo *= CONFIG_SYS_HZ; |
f39748ae | 144 | tmo /= 1000; |
101e8dfa | 145 | } else { |
f39748ae | 146 | if (usec > 1) { |
6d0f6bcf | 147 | tmo = usec * CONFIG_SYS_HZ; |
f39748ae | 148 | tmo /= (1000*1000); |
101e8dfa | 149 | } else { |
f39748ae | 150 | tmo = 1; |
101e8dfa | 151 | } |
f39748ae WD |
152 | } |
153 | ||
101e8dfa | 154 | endtime = get_timer_masked () + tmo; |
f39748ae | 155 | |
101e8dfa WD |
156 | do { |
157 | ulong now = get_timer_masked (); | |
158 | diff = endtime - now; | |
159 | } while (diff >= 0); | |
f39748ae WD |
160 | } |
161 | ||
162 | /* | |
163 | * This function is derived from PowerPC code (read timebase as long long). | |
164 | * On ARM it just returns the timer value. | |
165 | */ | |
166 | unsigned long long get_ticks(void) | |
167 | { | |
168 | return get_timer(0); | |
169 | } | |
170 | ||
171 | /* | |
172 | * This function is derived from PowerPC code (timebase clock frequency). | |
173 | * On ARM it returns the number of timer ticks per second. | |
174 | */ | |
175 | ulong get_tbclk (void) | |
176 | { | |
177 | ulong tbclk; | |
178 | ||
179 | tbclk = timer_load_val * 100; | |
180 | ||
181 | return tbclk; | |
182 | } |