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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 2002-2004 | |
792a09eb | 14 | * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de> |
ff7fefe6 WD |
15 | * |
16 | * (C) Copyright 2004 | |
17 | * Philippe Robin, ARM Ltd. <philippe.robin@arm.com> | |
18 | * | |
19 | * See file CREDITS for list of people who contributed to this | |
20 | * project. | |
21 | * | |
22 | * This program is free software; you can redistribute it and/or | |
23 | * modify it under the terms of the GNU General Public License as | |
24 | * published by the Free Software Foundation; either version 2 of | |
25 | * the License, or (at your option) any later version. | |
26 | * | |
27 | * This program is distributed in the hope that it will be useful, | |
28 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
29 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
30 | * GNU General Public License for more details. | |
31 | * | |
32 | * You should have received a copy of the GNU General Public License | |
33 | * along with this program; if not, write to the Free Software | |
34 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
35 | * MA 02111-1307 USA | |
36 | */ | |
37 | ||
38 | #include <common.h> | |
39 | #include <arm926ejs.h> | |
40 | ||
41 | #define TIMER_LOAD_VAL 0xffffffff | |
42 | ||
43 | /* macro to read the 32 bit timer */ | |
6d0f6bcf | 44 | #define READ_TIMER (*(volatile ulong *)(CONFIG_SYS_TIMERBASE+8)) |
ff7fefe6 WD |
45 | |
46 | static ulong timestamp; | |
47 | static ulong lastdec; | |
48 | ||
49 | int timer_init (void) | |
50 | { | |
51 | int32_t val; | |
52 | ||
53 | /* Start the decrementer ticking down from 0xffffffff */ | |
6d0f6bcf | 54 | *((int32_t *) (CONFIG_SYS_TIMERBASE + LOAD_TIM)) = TIMER_LOAD_VAL; |
81472d89 | 55 | val = MPUTIM_ST | MPUTIM_AR | MPUTIM_CLOCK_ENABLE | (CONFIG_SYS_PTV << MPUTIM_PTV_BIT); |
6d0f6bcf | 56 | *((int32_t *) (CONFIG_SYS_TIMERBASE + CNTL_TIMER)) = val; |
ff7fefe6 WD |
57 | |
58 | /* init the timestamp and lastdec value */ | |
59 | reset_timer_masked(); | |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
64 | /* | |
65 | * timer without interrupts | |
66 | */ | |
67 | ||
68 | void reset_timer (void) | |
69 | { | |
70 | reset_timer_masked (); | |
71 | } | |
72 | ||
73 | ulong get_timer (ulong base) | |
74 | { | |
75 | return get_timer_masked () - base; | |
76 | } | |
77 | ||
78 | void set_timer (ulong t) | |
79 | { | |
80 | timestamp = t; | |
81 | } | |
82 | ||
83 | /* delay x useconds AND perserve advance timstamp value */ | |
84 | void udelay (unsigned long usec) | |
85 | { | |
86 | ulong tmo, tmp; | |
87 | ||
88 | if(usec >= 1000){ /* if "big" number, spread normalization to seconds */ | |
89 | tmo = usec / 1000; /* start to normalize for usec to ticks per sec */ | |
6d0f6bcf | 90 | tmo *= CONFIG_SYS_HZ; /* find number of "ticks" to wait to achieve target */ |
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91 | tmo /= 1000; /* finish normalize. */ |
92 | }else{ /* else small number, don't kill it prior to HZ multiply */ | |
6d0f6bcf | 93 | tmo = usec * CONFIG_SYS_HZ; |
ff7fefe6 WD |
94 | tmo /= (1000*1000); |
95 | } | |
96 | ||
97 | tmp = get_timer (0); /* get current timestamp */ | |
98 | if( (tmo + tmp + 1) < tmp ) /* if setting this fordward will roll time stamp */ | |
99 | reset_timer_masked (); /* reset "advancing" timestamp to 0, set lastdec value */ | |
100 | else | |
101 | tmo += tmp; /* else, set advancing stamp wake up time */ | |
102 | ||
103 | while (get_timer_masked () < tmo)/* loop till event */ | |
104 | /*NOP*/; | |
105 | } | |
106 | ||
107 | void reset_timer_masked (void) | |
108 | { | |
109 | /* reset time */ | |
110 | lastdec = READ_TIMER; /* capure current decrementer value time */ | |
111 | timestamp = 0; /* start "advancing" time stamp from 0 */ | |
112 | } | |
113 | ||
114 | ulong get_timer_masked (void) | |
115 | { | |
116 | ulong now = READ_TIMER; /* current tick value */ | |
117 | ||
118 | if (lastdec >= now) { /* normal mode (non roll) */ | |
119 | /* normal mode */ | |
120 | timestamp += lastdec - now; /* move stamp fordward with absoulte diff ticks */ | |
121 | } else { /* we have overflow of the count down timer */ | |
122 | /* nts = ts + ld + (TLV - now) | |
123 | * ts=old stamp, ld=time that passed before passing through -1 | |
124 | * (TLV-now) amount of time after passing though -1 | |
125 | * nts = new "advancing time stamp"...it could also roll and cause problems. | |
126 | */ | |
127 | timestamp += lastdec + TIMER_LOAD_VAL - now; | |
128 | } | |
129 | lastdec = now; | |
130 | ||
131 | return timestamp; | |
132 | } | |
133 | ||
134 | /* waits specified delay value and resets timestamp */ | |
135 | void udelay_masked (unsigned long usec) | |
136 | { | |
137 | ulong tmo; | |
138 | ulong endtime; | |
139 | signed long diff; | |
140 | ||
141 | if (usec >= 1000) { /* if "big" number, spread normalization to seconds */ | |
142 | tmo = usec / 1000; /* start to normalize for usec to ticks per sec */ | |
6d0f6bcf | 143 | tmo *= CONFIG_SYS_HZ; /* find number of "ticks" to wait to achieve target */ |
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144 | tmo /= 1000; /* finish normalize. */ |
145 | } else { /* else small number, don't kill it prior to HZ multiply */ | |
6d0f6bcf | 146 | tmo = usec * CONFIG_SYS_HZ; |
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147 | tmo /= (1000*1000); |
148 | } | |
149 | ||
150 | endtime = get_timer_masked () + tmo; | |
151 | ||
152 | do { | |
153 | ulong now = get_timer_masked (); | |
154 | diff = endtime - now; | |
155 | } while (diff >= 0); | |
156 | } | |
157 | ||
158 | /* | |
159 | * This function is derived from PowerPC code (read timebase as long long). | |
160 | * On ARM it just returns the timer value. | |
161 | */ | |
162 | unsigned long long get_ticks(void) | |
163 | { | |
164 | return get_timer(0); | |
165 | } | |
166 | ||
167 | /* | |
168 | * This function is derived from PowerPC code (timebase clock frequency). | |
169 | * On ARM it returns the number of timer ticks per second. | |
170 | */ | |
171 | ulong get_tbclk (void) | |
172 | { | |
173 | ulong tbclk; | |
174 | ||
6d0f6bcf | 175 | tbclk = CONFIG_SYS_HZ; |
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176 | return tbclk; |
177 | } |