blob: 392b158d508eb30c3dddb817ad80e10ee304d135 [file] [log] [blame]
Wolfgang Denkff7fefe2006-03-13 12:37:35 +01001/*
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
Detlev Zundel792a09e2009-05-13 10:54:10 +020014 * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
Wolfgang Denkff7fefe2006-03-13 12:37:35 +010015 *
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>
Wolfgang Denkff7fefe2006-03-13 12:37:35 +010039
40#define TIMER_LOAD_VAL 0xffffffff
41
42/* macro to read the 32 bit timer */
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020043#define READ_TIMER (*(volatile ulong *)(CONFIG_SYS_TIMERBASE+8))
Wolfgang Denkff7fefe2006-03-13 12:37:35 +010044
45static ulong timestamp;
46static ulong lastdec;
47
48int timer_init (void)
49{
50 int32_t val;
51
52 /* Start the decrementer ticking down from 0xffffffff */
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020053 *((int32_t *) (CONFIG_SYS_TIMERBASE + LOAD_TIM)) = TIMER_LOAD_VAL;
Ladislav Michl81472d82009-03-30 18:58:41 +020054 val = MPUTIM_ST | MPUTIM_AR | MPUTIM_CLOCK_ENABLE | (CONFIG_SYS_PTV << MPUTIM_PTV_BIT);
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020055 *((int32_t *) (CONFIG_SYS_TIMERBASE + CNTL_TIMER)) = val;
Wolfgang Denkff7fefe2006-03-13 12:37:35 +010056
57 /* init the timestamp and lastdec value */
58 reset_timer_masked();
59
60 return 0;
61}
62
63/*
64 * timer without interrupts
65 */
66
67void reset_timer (void)
68{
69 reset_timer_masked ();
70}
71
72ulong get_timer (ulong base)
73{
74 return get_timer_masked () - base;
75}
76
77void set_timer (ulong t)
78{
79 timestamp = t;
80}
81
82/* delay x useconds AND perserve advance timstamp value */
83void udelay (unsigned long usec)
84{
85 ulong tmo, tmp;
86
87 if(usec >= 1000){ /* if "big" number, spread normalization to seconds */
88 tmo = usec / 1000; /* start to normalize for usec to ticks per sec */
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020089 tmo *= CONFIG_SYS_HZ; /* find number of "ticks" to wait to achieve target */
Wolfgang Denkff7fefe2006-03-13 12:37:35 +010090 tmo /= 1000; /* finish normalize. */
91 }else{ /* else small number, don't kill it prior to HZ multiply */
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020092 tmo = usec * CONFIG_SYS_HZ;
Wolfgang Denkff7fefe2006-03-13 12:37:35 +010093 tmo /= (1000*1000);
94 }
95
96 tmp = get_timer (0); /* get current timestamp */
97 if( (tmo + tmp + 1) < tmp ) /* if setting this fordward will roll time stamp */
98 reset_timer_masked (); /* reset "advancing" timestamp to 0, set lastdec value */
99 else
100 tmo += tmp; /* else, set advancing stamp wake up time */
101
102 while (get_timer_masked () < tmo)/* loop till event */
103 /*NOP*/;
104}
105
106void reset_timer_masked (void)
107{
108 /* reset time */
109 lastdec = READ_TIMER; /* capure current decrementer value time */
110 timestamp = 0; /* start "advancing" time stamp from 0 */
111}
112
113ulong get_timer_masked (void)
114{
115 ulong now = READ_TIMER; /* current tick value */
116
117 if (lastdec >= now) { /* normal mode (non roll) */
118 /* normal mode */
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 */
126 timestamp += lastdec + TIMER_LOAD_VAL - now;
127 }
128 lastdec = now;
129
130 return timestamp;
131}
132
133/* waits specified delay value and resets timestamp */
134void udelay_masked (unsigned long usec)
135{
136 ulong tmo;
137 ulong endtime;
138 signed long diff;
139
140 if (usec >= 1000) { /* if "big" number, spread normalization to seconds */
141 tmo = usec / 1000; /* start to normalize for usec to ticks per sec */
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200142 tmo *= CONFIG_SYS_HZ; /* find number of "ticks" to wait to achieve target */
Wolfgang Denkff7fefe2006-03-13 12:37:35 +0100143 tmo /= 1000; /* finish normalize. */
144 } else { /* else small number, don't kill it prior to HZ multiply */
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200145 tmo = usec * CONFIG_SYS_HZ;
Wolfgang Denkff7fefe2006-03-13 12:37:35 +0100146 tmo /= (1000*1000);
147 }
148
149 endtime = get_timer_masked () + tmo;
150
151 do {
152 ulong now = get_timer_masked ();
153 diff = endtime - now;
154 } while (diff >= 0);
155}
156
157/*
158 * This function is derived from PowerPC code (read timebase as long long).
159 * On ARM it just returns the timer value.
160 */
161unsigned long long get_ticks(void)
162{
163 return get_timer(0);
164}
165
166/*
167 * This function is derived from PowerPC code (timebase clock frequency).
168 * On ARM it returns the number of timer ticks per second.
169 */
170ulong get_tbclk (void)
171{
172 ulong tbclk;
173
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200174 tbclk = CONFIG_SYS_HZ;
Wolfgang Denkff7fefe2006-03-13 12:37:35 +0100175 return tbclk;
176}