mirror of
https://github.com/u-boot/u-boot.git
synced 2024-11-26 21:54:37 +08:00
159 lines
4.0 KiB
C
159 lines
4.0 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>
|
|
*
|
|
* 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 <arm946es.h>
|
|
|
|
#define TIMER_LOAD_VAL 0xffffffff
|
|
extern void reset_cpu(ulong addr);
|
|
|
|
#ifdef CONFIG_INTEGRATOR
|
|
/* Timer functionality supplied by Integrator board (AP or CP) */
|
|
#else
|
|
|
|
static ulong timestamp;
|
|
static ulong lastdec;
|
|
|
|
/* nothing really to do with interrupts, just starts up a counter. */
|
|
int interrupt_init (void)
|
|
{
|
|
/* init the timestamp and lastdec value */
|
|
reset_timer_masked();
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* timer without interrupts
|
|
*/
|
|
|
|
void reset_timer (void)
|
|
{
|
|
reset_timer_masked ();
|
|
}
|
|
|
|
ulong get_timer (ulong base)
|
|
{
|
|
return get_timer_masked () - base;
|
|
}
|
|
|
|
void set_timer (ulong t)
|
|
{
|
|
timestamp = t;
|
|
}
|
|
|
|
/* delay x useconds AND perserve advance timstamp value */
|
|
void udelay(unsigned long usec)
|
|
{
|
|
udelay_masked(usec);
|
|
}
|
|
|
|
void reset_timer_masked (void)
|
|
{
|
|
/* reset time */
|
|
lastdec = READ_TIMER; /* capure current decrementer value time */
|
|
timestamp = 0; /* start "advancing" time stamp from 0 */
|
|
}
|
|
|
|
ulong get_timer_raw (void)
|
|
{
|
|
ulong now = READ_TIMER; /* current tick value */
|
|
|
|
if (lastdec >= now) { /* normal mode (non roll) */
|
|
/* normal mode */
|
|
timestamp += lastdec - now; /* move stamp fordward with absoulte diff ticks */
|
|
} else { /* we have overflow of the count down timer */
|
|
/* nts = ts + ld + (TLV - now)
|
|
* ts=old stamp, ld=time that passed before passing through -1
|
|
* (TLV-now) amount of time after passing though -1
|
|
* nts = new "advancing time stamp"...it could also roll and cause problems.
|
|
*/
|
|
timestamp += lastdec + TIMER_LOAD_VAL - now;
|
|
}
|
|
lastdec = now;
|
|
|
|
return timestamp;
|
|
}
|
|
|
|
ulong get_timer_masked (void)
|
|
{
|
|
return get_timer_raw() / TIMER_LOAD_VAL;
|
|
}
|
|
|
|
/* waits specified delay value and resets timestamp */
|
|
void udelay_masked (unsigned long usec)
|
|
{
|
|
ulong tmo;
|
|
|
|
if(usec >= 1000){ /* if "big" number, spread normalization to seconds */
|
|
tmo = usec / 1000; /* start to normalize for usec to ticks per sec */
|
|
tmo *= CONFIG_SYS_HZ_CLOCK; /* find number of "ticks" to wait to achieve target */
|
|
tmo /= 1000; /* finish normalize. */
|
|
}else{ /* else small number, don't kill it prior to HZ multiply */
|
|
tmo = usec * CONFIG_SYS_HZ_CLOCK;
|
|
tmo /= (1000*1000);
|
|
}
|
|
|
|
reset_timer_masked (); /* set "advancing" timestamp to 0, set lastdec vaule */
|
|
|
|
while (get_timer_raw () < tmo) /* wait for time stamp to overtake tick number.*/
|
|
/*NOP*/;
|
|
}
|
|
|
|
/*
|
|
* 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 = CONFIG_SYS_HZ;
|
|
return tbclk;
|
|
}
|
|
|
|
#endif /* CONFIG_INTEGRATOR */
|