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/*
* (C) Copyright 2007, 2012 Freescale Semiconductor, Inc.
* TsiChung Liew (Tsi-Chung.Liew@freescale.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 <asm/timer.h>
#include <asm/immap.h>
#include <asm/io.h>
DECLARE_GLOBAL_DATA_PTR;
static ulong timestamp;
#if defined(CONFIG_SLTTMR)
#ifndef CONFIG_SYS_UDELAY_BASE
# error "uDelay base not defined!"
#endif
#if !defined(CONFIG_SYS_TMR_BASE) || !defined(CONFIG_SYS_INTR_BASE) || !defined(CONFIG_SYS_TMRINTR_NO) || !defined(CONFIG_SYS_TMRINTR_MASK)
# error "TMR_BASE, INTR_BASE, TMRINTR_NO or TMRINTR_MASk not defined!"
#endif
extern void dtimer_intr_setup(void);
void __udelay(unsigned long usec)
{
slt_t *timerp = (slt_t *) (CONFIG_SYS_UDELAY_BASE);
u32 now, freq;
/* 1 us period */
freq = CONFIG_SYS_TIMER_PRESCALER;
/* Disable */
out_be32(&timerp->cr, 0);
out_be32(&timerp->tcnt, usec * freq);
out_be32(&timerp->cr, SLT_CR_TEN);
now = in_be32(&timerp->cnt);
while (now != 0)
now = in_be32(&timerp->cnt);
setbits_be32(&timerp->sr, SLT_SR_ST);
out_be32(&timerp->cr, 0);
}
void dtimer_interrupt(void *not_used)
{
slt_t *timerp = (slt_t *) (CONFIG_SYS_TMR_BASE);
/* check for timer interrupt asserted */
if ((CONFIG_SYS_TMRPND_REG & CONFIG_SYS_TMRINTR_MASK) == CONFIG_SYS_TMRINTR_PEND) {
setbits_be32(&timerp->sr, SLT_SR_ST);
timestamp++;
return;
}
}
int timer_init(void)
{
slt_t *timerp = (slt_t *) (CONFIG_SYS_TMR_BASE);
timestamp = 0;
/* disable timer */
out_be32(&timerp->cr, 0);
out_be32(&timerp->tcnt, 0);
/* clear status */
out_be32(&timerp->sr, SLT_SR_BE | SLT_SR_ST);
/* initialize and enable timer interrupt */
irq_install_handler(CONFIG_SYS_TMRINTR_NO, dtimer_interrupt, 0);
/* Interrupt every ms */
out_be32(&timerp->tcnt, 1000 * CONFIG_SYS_TIMER_PRESCALER);
dtimer_intr_setup();
/* set a period of 1us, set timer mode to restart and
enable timer and interrupt */
out_be32(&timerp->cr, SLT_CR_RUN | SLT_CR_IEN | SLT_CR_TEN);
return 0;
}
ulong get_timer(ulong base)
{
return (timestamp - base);
}
#endif /* CONFIG_SLTTMR */
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