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/*
* (C) Copyright 2003 Josef Baumgartner <josef.baumgartner@telex.de>
*
* (C) Copyright 2000
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* 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 <asm/mcftimer.h>
#ifdef CONFIG_M5272
#include <asm/m5272.h>
#include <asm/immap_5272.h>
#endif
#ifdef CONFIG_M5282
#include <asm/m5282.h>
#endif
static ulong timestamp;
#ifdef CONFIG_M5282
static unsigned short lastinc;
#endif
#if defined(CONFIG_M5272)
/*
* We use timer 3 which is running with a period of 1 us
*/
void udelay(unsigned long usec)
{
volatile timer_t *timerp = (timer_t *) (CFG_MBAR + MCFTIMER_BASE3);
uint start, now, tmp;
while (usec > 0) {
if (usec > 65000)
tmp = 65000;
else
tmp = usec;
usec = usec - tmp;
/* Set up TIMER 3 as timebase clock */
timerp->timer_tmr = MCFTIMER_TMR_DISABLE;
timerp->timer_tcn = 0;
/* set period to 1 us */
timerp->timer_tmr = (((CFG_CLK / 1000000) - 1) << 8) | MCFTIMER_TMR_CLK1 |
MCFTIMER_TMR_FREERUN | MCFTIMER_TMR_ENABLE;
start = now = timerp->timer_tcn;
while (now < start + tmp)
now = timerp->timer_tcn;
}
}
void mcf_timer_interrupt (void * not_used){
volatile timer_t *timerp = (timer_t *) (CFG_MBAR + MCFTIMER_BASE4);
volatile intctrl_t *intp = (intctrl_t *) (CFG_MBAR + MCFSIM_ICR1);
/* check for timer 4 interrupts */
if ((intp->int_isr & 0x01000000) != 0) {
return;
}
/* reset timer */
timerp->timer_ter = MCFTIMER_TER_CAP | MCFTIMER_TER_REF;
timestamp ++;
}
void timer_init (void) {
volatile timer_t *timerp = (timer_t *) (CFG_MBAR + MCFTIMER_BASE4);
volatile intctrl_t *intp = (intctrl_t *) (CFG_MBAR + MCFSIM_ICR1);
timestamp = 0;
/* Set up TIMER 4 as clock */
timerp->timer_tmr = MCFTIMER_TMR_DISABLE;
/* initialize and enable timer 4 interrupt */
irq_install_handler (72, mcf_timer_interrupt, 0);
intp->int_icr1 |= 0x0000000d;
timerp->timer_tcn = 0;
timerp->timer_trr = 1000; /* Interrupt every ms */
/* set a period of 1us, set timer mode to restart and enable timer and interrupt */
timerp->timer_tmr = (((CFG_CLK / 1000000) - 1) << 8) | MCFTIMER_TMR_CLK1 |
MCFTIMER_TMR_RESTART | MCFTIMER_TMR_ENORI | MCFTIMER_TMR_ENABLE;
}
void reset_timer (void)
{
timestamp = 0;
}
ulong get_timer (ulong base)
{
return (timestamp - base);
}
void set_timer (ulong t)
{
timestamp = t;
}
#endif
#if defined(CONFIG_M5282)
void udelay(unsigned long usec)
{
}
void timer_init (void)
{
volatile unsigned short *timerp;
timerp = (volatile unsigned short *) (CFG_MBAR + MCFTIMER_BASE4);
timestamp = 0;
/* Set up TIMER 4 as poll clock */
timerp[MCFTIMER_PCSR] = MCFTIMER_PCSR_OVW;
timerp[MCFTIMER_PMR] = lastinc = 0;
timerp[MCFTIMER_PCSR] =
(5 << 8) | MCFTIMER_PCSR_EN | MCFTIMER_PCSR_OVW;
}
void set_timer (ulong t)
{
volatile unsigned short *timerp;
timerp = (volatile unsigned short *) (CFG_MBAR + MCFTIMER_BASE4);
timestamp = 0;
timerp[MCFTIMER_PMR] = lastinc = 0;
}
ulong get_timer (ulong base)
{
unsigned short now, diff;
volatile unsigned short *timerp;
timerp = (volatile unsigned short *) (CFG_MBAR + MCFTIMER_BASE4);
now = timerp[MCFTIMER_PCNTR];
diff = -(now - lastinc);
timestamp += diff;
lastinc = now;
return timestamp - base;
}
void wait_ticks (unsigned long ticks)
{
set_timer (0);
while (get_timer (0) < ticks);
}
#endif
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