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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/timer.h>
#include <asm/immap.h>
#include <watchdog.h>
DECLARE_GLOBAL_DATA_PTR;
static volatile ulong timestamp = 0;
#ifndef CONFIG_SYS_WATCHDOG_FREQ
#define CONFIG_SYS_WATCHDOG_FREQ (CONFIG_SYS_HZ / 2)
#endif
#if defined(CONFIG_MCFTMR)
#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)
{
volatile dtmr_t *timerp = (dtmr_t *) (CONFIG_SYS_UDELAY_BASE);
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->tmr = DTIM_DTMR_RST_RST;
timerp->tcn = 0;
/* set period to 1 us */
timerp->tmr =
CONFIG_SYS_TIMER_PRESCALER | DTIM_DTMR_CLK_DIV1 | DTIM_DTMR_FRR |
DTIM_DTMR_RST_EN;
start = now = timerp->tcn;
while (now < start + tmp)
now = timerp->tcn;
}
}
void dtimer_interrupt(void *not_used)
{
volatile dtmr_t *timerp = (dtmr_t *) (CONFIG_SYS_TMR_BASE);
/* check for timer interrupt asserted */
if ((CONFIG_SYS_TMRPND_REG & CONFIG_SYS_TMRINTR_MASK) == CONFIG_SYS_TMRINTR_PEND) {
timerp->ter = (DTIM_DTER_CAP | DTIM_DTER_REF);
timestamp++;
#if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG)
if ((timestamp % (CONFIG_SYS_WATCHDOG_FREQ)) == 0) {
WATCHDOG_RESET ();
}
#endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */
return;
}
}
void timer_init(void)
{
volatile dtmr_t *timerp = (dtmr_t *) (CONFIG_SYS_TMR_BASE);
timestamp = 0;
timerp->tcn = 0;
timerp->trr = 0;
/* Set up TIMER 4 as clock */
timerp->tmr = DTIM_DTMR_RST_RST;
/* initialize and enable timer interrupt */
irq_install_handler(CONFIG_SYS_TMRINTR_NO, dtimer_interrupt, 0);
timerp->tcn = 0;
timerp->trr = 1000; /* Interrupt every ms */
dtimer_intr_setup();
/* set a period of 1us, set timer mode to restart and enable timer and interrupt */
timerp->tmr = CONFIG_SYS_TIMER_PRESCALER | DTIM_DTMR_CLK_DIV1 |
DTIM_DTMR_FRR | DTIM_DTMR_ORRI | DTIM_DTMR_RST_EN;
}
void reset_timer(void)
{
timestamp = 0;
}
ulong get_timer(ulong base)
{
return (timestamp - base);
}
void set_timer(ulong t)
{
timestamp = t;
}
#endif /* CONFIG_MCFTMR */
#if defined(CONFIG_MCFPIT)
#if !defined(CONFIG_SYS_PIT_BASE)
# error "CONFIG_SYS_PIT_BASE not defined!"
#endif
static unsigned short lastinc;
void udelay(unsigned long usec)
{
volatile pit_t *timerp = (pit_t *) (CONFIG_SYS_UDELAY_BASE);
uint tmp;
while (usec > 0) {
if (usec > 65000)
tmp = 65000;
else
tmp = usec;
usec = usec - tmp;
/* Set up TIMER 3 as timebase clock */
timerp->pcsr = PIT_PCSR_OVW;
timerp->pmr = 0;
/* set period to 1 us */
timerp->pcsr |= PIT_PCSR_PRE(CONFIG_SYS_PIT_PRESCALE) | PIT_PCSR_EN;
timerp->pmr = tmp;
while (timerp->pcntr > 0) ;
}
}
void timer_init(void)
{
volatile pit_t *timerp = (pit_t *) (CONFIG_SYS_PIT_BASE);
timestamp = 0;
/* Set up TIMER 4 as poll clock */
timerp->pcsr = PIT_PCSR_OVW;
timerp->pmr = lastinc = 0;
timerp->pcsr |= PIT_PCSR_PRE(CONFIG_SYS_PIT_PRESCALE) | PIT_PCSR_EN;
}
void set_timer(ulong t)
{
volatile pit_t *timerp = (pit_t *) (CONFIG_SYS_PIT_BASE);
timestamp = 0;
timerp->pmr = lastinc = 0;
}
ulong get_timer(ulong base)
{
unsigned short now, diff;
volatile pit_t *timerp = (pit_t *) (CONFIG_SYS_PIT_BASE);
now = timerp->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 /* CONFIG_MCFPIT */
/*
* This function is derived from PowerPC code (read timebase as long long).
* On M68K it just returns the timer value.
*/
unsigned long long get_ticks(void)
{
return get_timer(0);
}
unsigned long usec2ticks(unsigned long usec)
{
return get_timer(usec);
}
/*
* This function is derived from PowerPC code (timebase clock frequency).
* On M68K it returns the number of timer ticks per second.
*/
ulong get_tbclk(void)
{
ulong tbclk;
tbclk = CONFIG_SYS_HZ;
return tbclk;
}
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