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2e5983d2 WD |
1 | /* |
2 | * (C) Copyright 2003 | |
3 | * Texas Instruments, <www.ti.com> | |
4 | * | |
5 | * (C) Copyright 2002 | |
6 | * Sysgo Real-Time Solutions, GmbH <www.elinos.com> | |
7 | * Marius Groeger <mgroeger@sysgo.de> | |
8 | * | |
9 | * (C) Copyright 2002 | |
10 | * Sysgo Real-Time Solutions, GmbH <www.elinos.com> | |
11 | * Alex Zuepke <azu@sysgo.de> | |
12 | * | |
13 | * (C) Copyright 2002 | |
14 | * Gary Jennejohn, DENX Software Engineering, <gj@denx.de> | |
15 | * | |
16 | * See file CREDITS for list of people who contributed to this | |
17 | * project. | |
18 | * | |
19 | * This program is free software; you can redistribute it and/or | |
20 | * modify it under the terms of the GNU General Public License as | |
21 | * published by the Free Software Foundation; either version 2 of | |
22 | * the License, or (at your option) any later version. | |
23 | * | |
24 | * This program is distributed in the hope that it will be useful, | |
25 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
232c150a | 26 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
2e5983d2 WD |
27 | * GNU General Public License for more details. |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * along with this program; if not, write to the Free Software | |
31 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
32 | * MA 02111-1307 USA | |
33 | */ | |
34 | ||
35 | #include <common.h> | |
36 | #include <arm925t.h> | |
37 | #include <configs/omap1510.h> | |
38 | ||
2e5983d2 WD |
39 | #define TIMER_LOAD_VAL 0xffffffff |
40 | ||
41 | /* macro to read the 32 bit timer */ | |
6d0f6bcf | 42 | #define READ_TIMER (*(volatile ulong *)(CONFIG_SYS_TIMERBASE+8)) |
2e5983d2 | 43 | |
2e5983d2 WD |
44 | static ulong timestamp; |
45 | static ulong lastdec; | |
46 | ||
47 | /* nothing really to do with interrupts, just starts up a counter. */ | |
48 | int interrupt_init (void) | |
49 | { | |
50 | int32_t val; | |
51 | ||
a3ad8e26 | 52 | /* Start the decrementer ticking down from 0xffffffff */ |
6d0f6bcf JCPV |
53 | *((int32_t *) (CONFIG_SYS_TIMERBASE + LOAD_TIM)) = TIMER_LOAD_VAL; |
54 | val = MPUTIM_ST | MPUTIM_AR | MPUTIM_CLOCK_ENABLE | (CONFIG_SYS_PVT << MPUTIM_PTV_BIT); | |
55 | *((int32_t *) (CONFIG_SYS_TIMERBASE + CNTL_TIMER)) = val; | |
a3ad8e26 WD |
56 | |
57 | /* init the timestamp and lastdec value */ | |
58 | reset_timer_masked(); | |
59 | ||
2e5983d2 WD |
60 | return (0); |
61 | } | |
62 | ||
63 | /* | |
64 | * timer without interrupts | |
65 | */ | |
66 | ||
67 | void reset_timer (void) | |
68 | { | |
69 | reset_timer_masked (); | |
70 | } | |
71 | ||
72 | ulong get_timer (ulong base) | |
73 | { | |
74 | return get_timer_masked () - base; | |
75 | } | |
76 | ||
77 | void set_timer (ulong t) | |
78 | { | |
79 | timestamp = t; | |
80 | } | |
81 | ||
0b8fa03b | 82 | /* delay x useconds AND preserve advance timestamp value */ |
2e5983d2 WD |
83 | void udelay (unsigned long usec) |
84 | { | |
a3ad8e26 WD |
85 | ulong tmo, tmp; |
86 | ||
232c150a WD |
87 | if(usec >= 1000){ /* if "big" number, spread normalization to seconds */ |
88 | tmo = usec / 1000; /* start to normalize for usec to ticks per sec */ | |
6d0f6bcf | 89 | tmo *= CONFIG_SYS_HZ; /* find number of "ticks" to wait to achieve target */ |
232c150a WD |
90 | tmo /= 1000; /* finish normalize. */ |
91 | }else{ /* else small number, don't kill it prior to HZ multiply */ | |
6d0f6bcf | 92 | tmo = usec * CONFIG_SYS_HZ; |
a3ad8e26 WD |
93 | tmo /= (1000*1000); |
94 | } | |
2e5983d2 | 95 | |
a3ad8e26 | 96 | tmp = get_timer (0); /* get current timestamp */ |
232c150a | 97 | if( (tmo + tmp + 1) < tmp ) /* if setting this fordward will roll time stamp */ |
a3ad8e26 WD |
98 | reset_timer_masked (); /* reset "advancing" timestamp to 0, set lastdec value */ |
99 | else | |
100 | tmo += tmp; /* else, set advancing stamp wake up time */ | |
2e5983d2 | 101 | |
0b8fa03b | 102 | while (get_timer_masked () < tmo) /* loop till event */ |
2e5983d2 | 103 | /*NOP*/; |
2e5983d2 WD |
104 | } |
105 | ||
106 | void reset_timer_masked (void) | |
107 | { | |
108 | /* reset time */ | |
a3ad8e26 | 109 | lastdec = READ_TIMER; /* capure current decrementer value time */ |
232c150a | 110 | timestamp = 0; /* start "advancing" time stamp from 0 */ |
2e5983d2 WD |
111 | } |
112 | ||
113 | ulong get_timer_masked (void) | |
114 | { | |
a3ad8e26 | 115 | ulong now = READ_TIMER; /* current tick value */ |
2e5983d2 | 116 | |
a3ad8e26 | 117 | if (lastdec >= now) { /* normal mode (non roll) */ |
2e5983d2 | 118 | /* normal mode */ |
a3ad8e26 WD |
119 | timestamp += lastdec - now; /* move stamp fordward with absoulte diff ticks */ |
120 | } else { /* we have overflow of the count down timer */ | |
121 | /* nts = ts + ld + (TLV - now) | |
122 | * ts=old stamp, ld=time that passed before passing through -1 | |
123 | * (TLV-now) amount of time after passing though -1 | |
124 | * nts = new "advancing time stamp"...it could also roll and cause problems. | |
125 | */ | |
2e5983d2 WD |
126 | timestamp += lastdec + TIMER_LOAD_VAL - now; |
127 | } | |
128 | lastdec = now; | |
129 | ||
130 | return timestamp; | |
131 | } | |
132 | ||
a3ad8e26 | 133 | /* waits specified delay value and resets timestamp */ |
2e5983d2 WD |
134 | void udelay_masked (unsigned long usec) |
135 | { | |
136 | #ifdef CONFIG_INNOVATOROMAP1510 | |
137 | #define LOOPS_PER_MSEC 60 /* tuned on omap1510 */ | |
138 | volatile int i, time_remaining = LOOPS_PER_MSEC*usec; | |
139 | for (i=time_remaining; i>0; i--) { } | |
140 | #else | |
141 | ||
232c150a | 142 | ulong tmo; |
101e8dfa WD |
143 | ulong endtime; |
144 | signed long diff; | |
2e5983d2 | 145 | |
101e8dfa | 146 | if (usec >= 1000) { /* if "big" number, spread normalization to seconds */ |
232c150a | 147 | tmo = usec / 1000; /* start to normalize for usec to ticks per sec */ |
6d0f6bcf | 148 | tmo *= CONFIG_SYS_HZ; /* find number of "ticks" to wait to achieve target */ |
232c150a | 149 | tmo /= 1000; /* finish normalize. */ |
101e8dfa | 150 | } else { /* else small number, don't kill it prior to HZ multiply */ |
6d0f6bcf | 151 | tmo = usec * CONFIG_SYS_HZ; |
a3ad8e26 WD |
152 | tmo /= (1000*1000); |
153 | } | |
2e5983d2 | 154 | |
101e8dfa | 155 | endtime = get_timer_masked () + tmo; |
2e5983d2 | 156 | |
101e8dfa WD |
157 | do { |
158 | ulong now = get_timer_masked (); | |
159 | diff = endtime - now; | |
160 | } while (diff >= 0); | |
2e5983d2 WD |
161 | #endif |
162 | } | |
163 | ||
164 | /* | |
165 | * This function is derived from PowerPC code (read timebase as long long). | |
166 | * On ARM it just returns the timer value. | |
167 | */ | |
168 | unsigned long long get_ticks(void) | |
169 | { | |
170 | return get_timer(0); | |
171 | } | |
172 | ||
173 | /* | |
174 | * This function is derived from PowerPC code (timebase clock frequency). | |
175 | * On ARM it returns the number of timer ticks per second. | |
176 | */ | |
177 | ulong get_tbclk (void) | |
a3ad8e26 | 178 | { |
2e5983d2 WD |
179 | ulong tbclk; |
180 | ||
6d0f6bcf | 181 | tbclk = CONFIG_SYS_HZ; |
2e5983d2 WD |
182 | return tbclk; |
183 | } |