3 * Texas Instruments <www.ti.com>
6 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
7 * Marius Groeger <mgroeger@sysgo.de>
10 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
11 * Alex Zuepke <azu@sysgo.de>
13 * (C) Copyright 2002-2004
14 * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
17 * Philippe Robin, ARM Ltd. <philippe.robin@arm.com>
19 * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
21 * See file CREDITS for list of people who contributed to this
24 * This program is free software; you can redistribute it and/or
25 * modify it under the terms of the GNU General Public License as
26 * published by the Free Software Foundation; either version 2 of
27 * the License, or (at your option) any later version.
29 * This program is distributed in the hope that it will be useful,
30 * but WITHOUT ANY WARRANTY; without even the implied warranty of
31 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
32 * GNU General Public License for more details.
34 * You should have received a copy of the GNU General Public License
35 * along with this program; if not, write to the Free Software
36 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
42 typedef volatile struct {
56 davinci_timer *timer = (davinci_timer *)CONFIG_SYS_TIMERBASE;
58 #define TIMER_LOAD_VAL (CONFIG_SYS_HZ_CLOCK / CONFIG_SYS_HZ)
59 #define TIM_CLK_DIV 16
61 static ulong timestamp;
66 /* We are using timer34 in unchained 32-bit mode, full speed */
69 timer->tgcr = 0x06 | ((TIM_CLK_DIV - 1) << 8);
71 timer->prd34 = TIMER_LOAD_VAL;
79 void reset_timer(void)
88 static ulong get_timer_raw(void)
90 ulong now = timer->tim34;
94 timestamp += now - lastinc;
97 timestamp += now + TIMER_LOAD_VAL - lastinc;
103 ulong get_timer(ulong base)
105 return((get_timer_raw() / (TIMER_LOAD_VAL / TIM_CLK_DIV)) - base);
108 void set_timer(ulong t)
113 void udelay(unsigned long usec)
119 tmo = CONFIG_SYS_HZ_CLOCK / 1000;
121 tmo /= (1000 * TIM_CLK_DIV);
123 endtime = get_timer_raw() + tmo;
126 ulong now = get_timer_raw();
127 diff = endtime - now;
132 * This function is derived from PowerPC code (read timebase as long long).
133 * On ARM it just returns the timer value.
135 unsigned long long get_ticks(void)
137 return(get_timer(0));
141 * This function is derived from PowerPC code (timebase clock frequency).
142 * On ARM it returns the number of timer ticks per second.
144 ulong get_tbclk(void)
146 return CONFIG_SYS_HZ;