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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> | |
33 | #include <arm920t.h> | |
34 | #include <lh7a40x.h> | |
35 | ||
f39748ae WD |
36 | static ulong timer_load_val = 0; |
37 | ||
38 | /* macro to read the 16 bit timer */ | |
39 | static inline ulong READ_TIMER(void) | |
40 | { | |
f832d8a1 | 41 | lh7a40x_timers_t* timers = LH7A40X_TIMERS_PTR; |
f39748ae WD |
42 | lh7a40x_timer_t* timer = &timers->timer1; |
43 | ||
44 | return (timer->value & 0x0000ffff); | |
45 | } | |
46 | ||
f39748ae WD |
47 | static ulong timestamp; |
48 | static ulong lastdec; | |
49 | ||
50 | int interrupt_init (void) | |
51 | { | |
f832d8a1 | 52 | lh7a40x_timers_t* timers = LH7A40X_TIMERS_PTR; |
f39748ae WD |
53 | lh7a40x_timer_t* timer = &timers->timer1; |
54 | ||
55 | /* a periodic timer using the 508kHz source */ | |
56 | timer->control = (TIMER_PER | TIMER_CLK508K); | |
57 | ||
58 | if (timer_load_val == 0) { | |
59 | /* | |
60 | * 10ms period with 508.469kHz clock = 5084 | |
61 | */ | |
6d0f6bcf | 62 | timer_load_val = CONFIG_SYS_HZ/100; |
f39748ae WD |
63 | } |
64 | ||
65 | /* load value for 10 ms timeout */ | |
66 | lastdec = timer->load = timer_load_val; | |
67 | ||
68 | /* auto load, start timer */ | |
69 | timer->control = timer->control | TIMER_EN; | |
70 | timestamp = 0; | |
71 | ||
72 | return (0); | |
73 | } | |
74 | ||
75 | /* | |
76 | * timer without interrupts | |
77 | */ | |
78 | ||
79 | void reset_timer (void) | |
80 | { | |
81 | reset_timer_masked (); | |
82 | } | |
83 | ||
84 | ulong get_timer (ulong base) | |
85 | { | |
86 | return (get_timer_masked() - base); | |
87 | } | |
88 | ||
89 | void set_timer (ulong t) | |
90 | { | |
91 | timestamp = t; | |
92 | } | |
93 | ||
94 | void udelay (unsigned long usec) | |
95 | { | |
96 | ulong tmo,tmp; | |
97 | ||
98 | /* normalize */ | |
99 | if (usec >= 1000) { | |
100 | tmo = usec / 1000; | |
6d0f6bcf | 101 | tmo *= CONFIG_SYS_HZ; |
f39748ae WD |
102 | tmo /= 1000; |
103 | } | |
104 | else { | |
105 | if (usec > 1) { | |
6d0f6bcf | 106 | tmo = usec * CONFIG_SYS_HZ; |
f39748ae WD |
107 | tmo /= (1000*1000); |
108 | } | |
109 | else | |
110 | tmo = 1; | |
111 | } | |
112 | ||
113 | /* check for rollover during this delay */ | |
114 | tmp = get_timer (0); | |
115 | if ((tmp + tmo) < tmp ) | |
116 | reset_timer_masked(); /* timer would roll over */ | |
117 | else | |
118 | tmo += tmp; | |
119 | ||
120 | while (get_timer_masked () < tmo); | |
121 | } | |
122 | ||
123 | void reset_timer_masked (void) | |
124 | { | |
125 | /* reset time */ | |
126 | lastdec = READ_TIMER(); | |
127 | timestamp = 0; | |
128 | } | |
129 | ||
130 | ulong get_timer_masked (void) | |
131 | { | |
132 | ulong now = READ_TIMER(); | |
133 | ||
134 | if (lastdec >= now) { | |
135 | /* normal mode */ | |
136 | timestamp += (lastdec - now); | |
137 | } else { | |
138 | /* we have an overflow ... */ | |
139 | timestamp += ((lastdec + timer_load_val) - now); | |
140 | } | |
141 | lastdec = now; | |
142 | ||
143 | return timestamp; | |
144 | } | |
145 | ||
146 | void udelay_masked (unsigned long usec) | |
147 | { | |
148 | ulong tmo; | |
101e8dfa WD |
149 | ulong endtime; |
150 | signed long diff; | |
f39748ae WD |
151 | |
152 | /* normalize */ | |
153 | if (usec >= 1000) { | |
154 | tmo = usec / 1000; | |
6d0f6bcf | 155 | tmo *= CONFIG_SYS_HZ; |
f39748ae | 156 | tmo /= 1000; |
101e8dfa | 157 | } else { |
f39748ae | 158 | if (usec > 1) { |
6d0f6bcf | 159 | tmo = usec * CONFIG_SYS_HZ; |
f39748ae | 160 | tmo /= (1000*1000); |
101e8dfa | 161 | } else { |
f39748ae | 162 | tmo = 1; |
101e8dfa | 163 | } |
f39748ae WD |
164 | } |
165 | ||
101e8dfa | 166 | endtime = get_timer_masked () + tmo; |
f39748ae | 167 | |
101e8dfa WD |
168 | do { |
169 | ulong now = get_timer_masked (); | |
170 | diff = endtime - now; | |
171 | } while (diff >= 0); | |
f39748ae WD |
172 | } |
173 | ||
174 | /* | |
175 | * This function is derived from PowerPC code (read timebase as long long). | |
176 | * On ARM it just returns the timer value. | |
177 | */ | |
178 | unsigned long long get_ticks(void) | |
179 | { | |
180 | return get_timer(0); | |
181 | } | |
182 | ||
183 | /* | |
184 | * This function is derived from PowerPC code (timebase clock frequency). | |
185 | * On ARM it returns the number of timer ticks per second. | |
186 | */ | |
187 | ulong get_tbclk (void) | |
188 | { | |
189 | ulong tbclk; | |
190 | ||
191 | tbclk = timer_load_val * 100; | |
192 | ||
193 | return tbclk; | |
194 | } |