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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 | ||
b54384e3 | 45 | int timer_init (void) |
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46 | { |
47 | int32_t val; | |
48 | ||
49 | /* Start the counter ticking up */ | |
6d0f6bcf | 50 | *((int32_t *) (CONFIG_SYS_TIMERBASE + TLDR)) = TIMER_LOAD_VAL; /* reload value on overflow*/ |
81472d89 | 51 | val = (CONFIG_SYS_PTV << 2) | BIT5 | BIT1 | BIT0; /* mask to enable timer*/ |
6d0f6bcf | 52 | *((int32_t *) (CONFIG_SYS_TIMERBASE + TCLR)) = val; /* start timer */ |
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53 | |
54 | reset_timer_masked(); /* init the timestamp and lastinc value */ | |
55 | ||
56 | return(0); | |
57 | } | |
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58 | /* |
59 | * timer without interrupts | |
60 | */ | |
950a3924 | 61 | void reset_timer (void) |
8ed96046 | 62 | { |
950a3924 | 63 | reset_timer_masked (); |
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64 | } |
65 | ||
950a3924 | 66 | ulong get_timer (ulong base) |
8ed96046 | 67 | { |
950a3924 | 68 | return get_timer_masked () - base; |
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69 | } |
70 | ||
950a3924 | 71 | void set_timer (ulong t) |
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72 | { |
73 | timestamp = t; | |
74 | } | |
75 | ||
76 | /* delay x useconds AND perserve advance timstamp value */ | |
3eb90bad | 77 | void __udelay (unsigned long usec) |
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78 | { |
79 | ulong tmo, tmp; | |
80 | ||
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81 | if (usec >= 1000) { /* if "big" number, spread normalization to seconds */ |
82 | tmo = usec / 1000; /* start to normalize for usec to ticks per sec */ | |
6d0f6bcf | 83 | tmo *= CONFIG_SYS_HZ; /* find number of "ticks" to wait to achieve target */ |
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84 | tmo /= 1000; /* finish normalize. */ |
85 | } else { /* else small number, don't kill it prior to HZ multiply */ | |
6d0f6bcf | 86 | tmo = usec * CONFIG_SYS_HZ; |
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87 | tmo /= (1000*1000); |
88 | } | |
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89 | |
90 | tmp = get_timer (0); /* get current timestamp */ | |
91 | if ( (tmo + tmp + 1) < tmp )/* if setting this forward will roll time stamp */ | |
92 | reset_timer_masked (); /* reset "advancing" timestamp to 0, set lastinc value */ | |
8ed96046 | 93 | else |
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94 | tmo += tmp; /* else, set advancing stamp wake up time */ |
95 | while (get_timer_masked () < tmo)/* loop till event */ | |
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96 | /*NOP*/; |
97 | } | |
98 | ||
950a3924 | 99 | void reset_timer_masked (void) |
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100 | { |
101 | /* reset time */ | |
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102 | lastinc = READ_TIMER; /* capture current incrementer value time */ |
103 | timestamp = 0; /* start "advancing" time stamp from 0 */ | |
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104 | } |
105 | ||
950a3924 | 106 | ulong get_timer_masked (void) |
8ed96046 | 107 | { |
950a3924 | 108 | ulong now = READ_TIMER; /* current tick value */ |
8ed96046 | 109 | |
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110 | if (now >= lastinc) /* normal mode (non roll) */ |
111 | timestamp += (now - lastinc); /* move stamp fordward with absoulte diff ticks */ | |
112 | else /* we have rollover of incrementer */ | |
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113 | timestamp += (0xFFFFFFFF - lastinc) + now; |
114 | lastinc = now; | |
115 | return timestamp; | |
116 | } | |
117 | ||
118 | /* waits specified delay value and resets timestamp */ | |
950a3924 | 119 | void udelay_masked (unsigned long usec) |
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120 | { |
121 | ulong tmo; | |
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122 | ulong endtime; |
123 | signed long diff; | |
8ed96046 | 124 | |
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125 | if (usec >= 1000) { /* if "big" number, spread normalization to seconds */ |
126 | tmo = usec / 1000; /* start to normalize for usec to ticks per sec */ | |
6d0f6bcf | 127 | tmo *= CONFIG_SYS_HZ; /* find number of "ticks" to wait to achieve target */ |
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128 | tmo /= 1000; /* finish normalize. */ |
129 | } else { /* else small number, don't kill it prior to HZ multiply */ | |
6d0f6bcf | 130 | tmo = usec * CONFIG_SYS_HZ; |
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131 | tmo /= (1000*1000); |
132 | } | |
950a3924 | 133 | endtime = get_timer_masked () + tmo; |
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134 | |
135 | do { | |
950a3924 | 136 | ulong now = get_timer_masked (); |
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137 | diff = endtime - now; |
138 | } while (diff >= 0); | |
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139 | } |
140 | ||
141 | /* | |
142 | * This function is derived from PowerPC code (read timebase as long long). | |
143 | * On ARM it just returns the timer value. | |
144 | */ | |
145 | unsigned long long get_ticks(void) | |
146 | { | |
147 | return get_timer(0); | |
148 | } | |
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149 | /* |
150 | * This function is derived from PowerPC code (timebase clock frequency). | |
151 | * On ARM it returns the number of timer ticks per second. | |
152 | */ | |
950a3924 | 153 | ulong get_tbclk (void) |
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154 | { |
155 | ulong tbclk; | |
6d0f6bcf | 156 | tbclk = CONFIG_SYS_HZ; |
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157 | return tbclk; |
158 | } |