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8ed96046 | 1 | /* |
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2 | * (C) Copyright 2004 |
3 | * Texas Instruments | |
4 | * Richard Woodruff <r-woodruff2@ti.com> | |
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5 | * |
6 | * (C) Copyright 2002 | |
7 | * Sysgo Real-Time Solutions, GmbH <www.elinos.com> | |
8 | * Marius Groeger <mgroeger@sysgo.de> | |
8ed96046 WD |
9 | * Alex Zuepke <azu@sysgo.de> |
10 | * | |
11 | * (C) Copyright 2002 | |
792a09eb | 12 | * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de> |
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13 | * |
14 | * See file CREDITS for list of people who contributed to this | |
15 | * project. | |
16 | * | |
17 | * This program is free software; you can redistribute it and/or | |
18 | * modify it under the terms of the GNU General Public License as | |
19 | * published by the Free Software Foundation; either version 2 of | |
20 | * the License, or (at your option) any later version. | |
21 | * | |
22 | * This program is distributed in the hope that it will be useful, | |
23 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
25 | * GNU General Public License for more details. | |
26 | * | |
27 | * You should have received a copy of the GNU General Public License | |
28 | * along with this program; if not, write to the Free Software | |
29 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
30 | * MA 02111-1307 USA | |
31 | */ | |
32 | ||
33 | #include <common.h> | |
34 | #include <asm/arch/bits.h> | |
5252ed95 | 35 | #include <asm/arch/omap2420.h> |
87cb6862 | 36 | |
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37 | #define TIMER_LOAD_VAL 0 |
38 | ||
39 | /* macro to read the 32 bit timer */ | |
6d0f6bcf | 40 | #define READ_TIMER (*((volatile ulong *)(CONFIG_SYS_TIMERBASE+TCRR))) |
950a3924 | 41 | |
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42 | static ulong timestamp; |
43 | static ulong lastinc; | |
44 | ||
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45 | /* nothing really to do with interrupts, just starts up a counter. */ |
46 | int interrupt_init (void) | |
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47 | { |
48 | int32_t val; | |
49 | ||
50 | /* Start the counter ticking up */ | |
6d0f6bcf | 51 | *((int32_t *) (CONFIG_SYS_TIMERBASE + TLDR)) = TIMER_LOAD_VAL; /* reload value on overflow*/ |
81472d89 | 52 | val = (CONFIG_SYS_PTV << 2) | BIT5 | BIT1 | BIT0; /* mask to enable timer*/ |
6d0f6bcf | 53 | *((int32_t *) (CONFIG_SYS_TIMERBASE + TCLR)) = val; /* start timer */ |
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54 | |
55 | reset_timer_masked(); /* init the timestamp and lastinc value */ | |
56 | ||
57 | return(0); | |
58 | } | |
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59 | /* |
60 | * timer without interrupts | |
61 | */ | |
950a3924 | 62 | void reset_timer (void) |
8ed96046 | 63 | { |
950a3924 | 64 | reset_timer_masked (); |
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65 | } |
66 | ||
950a3924 | 67 | ulong get_timer (ulong base) |
8ed96046 | 68 | { |
950a3924 | 69 | return get_timer_masked () - base; |
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70 | } |
71 | ||
950a3924 | 72 | void set_timer (ulong t) |
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73 | { |
74 | timestamp = t; | |
75 | } | |
76 | ||
77 | /* delay x useconds AND perserve advance timstamp value */ | |
950a3924 | 78 | void udelay (unsigned long usec) |
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79 | { |
80 | ulong tmo, tmp; | |
81 | ||
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82 | if (usec >= 1000) { /* if "big" number, spread normalization to seconds */ |
83 | tmo = usec / 1000; /* start to normalize for usec to ticks per sec */ | |
6d0f6bcf | 84 | tmo *= CONFIG_SYS_HZ; /* find number of "ticks" to wait to achieve target */ |
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85 | tmo /= 1000; /* finish normalize. */ |
86 | } else { /* else small number, don't kill it prior to HZ multiply */ | |
6d0f6bcf | 87 | tmo = usec * CONFIG_SYS_HZ; |
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88 | tmo /= (1000*1000); |
89 | } | |
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90 | |
91 | tmp = get_timer (0); /* get current timestamp */ | |
92 | if ( (tmo + tmp + 1) < tmp )/* if setting this forward will roll time stamp */ | |
93 | reset_timer_masked (); /* reset "advancing" timestamp to 0, set lastinc value */ | |
8ed96046 | 94 | else |
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95 | tmo += tmp; /* else, set advancing stamp wake up time */ |
96 | while (get_timer_masked () < tmo)/* loop till event */ | |
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97 | /*NOP*/; |
98 | } | |
99 | ||
950a3924 | 100 | void reset_timer_masked (void) |
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101 | { |
102 | /* reset time */ | |
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103 | lastinc = READ_TIMER; /* capture current incrementer value time */ |
104 | timestamp = 0; /* start "advancing" time stamp from 0 */ | |
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105 | } |
106 | ||
950a3924 | 107 | ulong get_timer_masked (void) |
8ed96046 | 108 | { |
950a3924 | 109 | ulong now = READ_TIMER; /* current tick value */ |
8ed96046 | 110 | |
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111 | if (now >= lastinc) /* normal mode (non roll) */ |
112 | timestamp += (now - lastinc); /* move stamp fordward with absoulte diff ticks */ | |
113 | else /* we have rollover of incrementer */ | |
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114 | timestamp += (0xFFFFFFFF - lastinc) + now; |
115 | lastinc = now; | |
116 | return timestamp; | |
117 | } | |
118 | ||
119 | /* waits specified delay value and resets timestamp */ | |
950a3924 | 120 | void udelay_masked (unsigned long usec) |
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121 | { |
122 | ulong tmo; | |
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123 | ulong endtime; |
124 | signed long diff; | |
8ed96046 | 125 | |
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126 | if (usec >= 1000) { /* if "big" number, spread normalization to seconds */ |
127 | tmo = usec / 1000; /* start to normalize for usec to ticks per sec */ | |
6d0f6bcf | 128 | tmo *= CONFIG_SYS_HZ; /* find number of "ticks" to wait to achieve target */ |
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129 | tmo /= 1000; /* finish normalize. */ |
130 | } else { /* else small number, don't kill it prior to HZ multiply */ | |
6d0f6bcf | 131 | tmo = usec * CONFIG_SYS_HZ; |
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132 | tmo /= (1000*1000); |
133 | } | |
950a3924 | 134 | endtime = get_timer_masked () + tmo; |
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135 | |
136 | do { | |
950a3924 | 137 | ulong now = get_timer_masked (); |
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138 | diff = endtime - now; |
139 | } while (diff >= 0); | |
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140 | } |
141 | ||
142 | /* | |
143 | * This function is derived from PowerPC code (read timebase as long long). | |
144 | * On ARM it just returns the timer value. | |
145 | */ | |
146 | unsigned long long get_ticks(void) | |
147 | { | |
148 | return get_timer(0); | |
149 | } | |
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150 | /* |
151 | * This function is derived from PowerPC code (timebase clock frequency). | |
152 | * On ARM it returns the number of timer ticks per second. | |
153 | */ | |
950a3924 | 154 | ulong get_tbclk (void) |
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155 | { |
156 | ulong tbclk; | |
6d0f6bcf | 157 | tbclk = CONFIG_SYS_HZ; |
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158 | return tbclk; |
159 | } |