166 lines
3.3 KiB
C
166 lines
3.3 KiB
C
/*
|
|
* (C) Copyright 2003
|
|
* Texas Instruments <www.ti.com>
|
|
*
|
|
* (C) Copyright 2002
|
|
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
|
|
* Marius Groeger <mgroeger@sysgo.de>
|
|
*
|
|
* (C) Copyright 2002
|
|
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
|
|
* Alex Zuepke <azu@sysgo.de>
|
|
*
|
|
* (C) Copyright 2002-2004
|
|
* Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
|
|
*
|
|
* (C) Copyright 2004
|
|
* Philippe Robin, ARM Ltd. <philippe.robin@arm.com>
|
|
*
|
|
* Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of
|
|
* the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
|
* MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <arm926ejs.h>
|
|
|
|
typedef volatile struct {
|
|
u_int32_t pid12;
|
|
u_int32_t emumgt_clksped;
|
|
u_int32_t gpint_en;
|
|
u_int32_t gpdir_dat;
|
|
u_int32_t tim12;
|
|
u_int32_t tim34;
|
|
u_int32_t prd12;
|
|
u_int32_t prd34;
|
|
u_int32_t tcr;
|
|
u_int32_t tgcr;
|
|
u_int32_t wdtcr;
|
|
u_int32_t tlgc;
|
|
u_int32_t tlmr;
|
|
} davinci_timer;
|
|
|
|
davinci_timer *timer = (davinci_timer *)CFG_TIMERBASE;
|
|
|
|
#define TIMER_LOAD_VAL (CFG_HZ_CLOCK / CFG_HZ)
|
|
#define READ_TIMER timer->tim34
|
|
|
|
static ulong timestamp;
|
|
static ulong lastinc;
|
|
|
|
int timer_init(void)
|
|
{
|
|
/* We are using timer34 in unchained 32-bit mode, full speed */
|
|
timer->tcr = 0x0;
|
|
timer->tgcr = 0x0;
|
|
timer->tgcr = 0x06;
|
|
timer->tim34 = 0x0;
|
|
timer->prd34 = TIMER_LOAD_VAL;
|
|
lastinc = 0;
|
|
timer->tcr = 0x80 << 16;
|
|
timestamp = 0;
|
|
|
|
return(0);
|
|
}
|
|
|
|
void reset_timer(void)
|
|
{
|
|
reset_timer_masked();
|
|
}
|
|
|
|
ulong get_timer(ulong base)
|
|
{
|
|
return(get_timer_masked() - base);
|
|
}
|
|
|
|
void set_timer(ulong t)
|
|
{
|
|
timestamp = t;
|
|
}
|
|
|
|
void udelay(unsigned long usec)
|
|
{
|
|
udelay_masked(usec);
|
|
}
|
|
|
|
void reset_timer_masked(void)
|
|
{
|
|
lastinc = READ_TIMER;
|
|
timestamp = 0;
|
|
}
|
|
|
|
ulong get_timer_raw(void)
|
|
{
|
|
ulong now = READ_TIMER;
|
|
|
|
if (now >= lastinc) {
|
|
/* normal mode */
|
|
timestamp += now - lastinc;
|
|
} else {
|
|
/* overflow ... */
|
|
timestamp += now + TIMER_LOAD_VAL - lastinc;
|
|
}
|
|
lastinc = now;
|
|
return timestamp;
|
|
}
|
|
|
|
ulong get_timer_masked(void)
|
|
{
|
|
return(get_timer_raw() / TIMER_LOAD_VAL);
|
|
}
|
|
|
|
void udelay_masked(unsigned long usec)
|
|
{
|
|
ulong tmo;
|
|
ulong endtime;
|
|
signed long diff;
|
|
|
|
tmo = CFG_HZ_CLOCK / 1000;
|
|
tmo *= usec;
|
|
tmo /= 1000;
|
|
|
|
endtime = get_timer_raw() + tmo;
|
|
|
|
do {
|
|
ulong now = get_timer_raw();
|
|
diff = endtime - now;
|
|
} while (diff >= 0);
|
|
}
|
|
|
|
/*
|
|
* This function is derived from PowerPC code (read timebase as long long).
|
|
* On ARM it just returns the timer value.
|
|
*/
|
|
unsigned long long get_ticks(void)
|
|
{
|
|
return(get_timer(0));
|
|
}
|
|
|
|
/*
|
|
* This function is derived from PowerPC code (timebase clock frequency).
|
|
* On ARM it returns the number of timer ticks per second.
|
|
*/
|
|
ulong get_tbclk(void)
|
|
{
|
|
ulong tbclk;
|
|
|
|
tbclk = CFG_HZ;
|
|
return(tbclk);
|
|
}
|