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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2003 Josef Baumgartner <josef.baumgartner@telex.de>
*
* (C) Copyright 2000
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*/
#include <common.h>
#include <init.h>
#include <irq_func.h>
#include <time.h>
#include <asm/global_data.h>
#include <linux/delay.h>
#include <asm/timer.h>
#include <asm/immap.h>
#include <watchdog.h>
DECLARE_GLOBAL_DATA_PTR;
static volatile ulong timestamp = 0;
#ifndef CFG_SYS_WATCHDOG_FREQ
#define CFG_SYS_WATCHDOG_FREQ (CONFIG_SYS_HZ / 2)
#endif
#if defined(CONFIG_MCFTMR)
#ifndef CFG_SYS_UDELAY_BASE
# error "uDelay base not defined!"
#endif
#if !defined(CFG_SYS_TMR_BASE) || !defined(CFG_SYS_INTR_BASE) || !defined(CFG_SYS_TMRINTR_NO) || !defined(CFG_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 *) (CFG_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 =
CFG_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 *) (CFG_SYS_TMR_BASE);
/* check for timer interrupt asserted */
if ((CFG_SYS_TMRPND_REG & CFG_SYS_TMRINTR_MASK) == CFG_SYS_TMRINTR_PEND) {
timerp->ter = (DTIM_DTER_CAP | DTIM_DTER_REF);
timestamp++;
#if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG)
if (CFG_SYS_WATCHDOG_FREQ && (timestamp % (CFG_SYS_WATCHDOG_FREQ)) == 0) {
schedule();
}
#endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */
return;
}
}
int timer_init(void)
{
volatile dtmr_t *timerp = (dtmr_t *) (CFG_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(CFG_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 = CFG_SYS_TIMER_PRESCALER | DTIM_DTMR_CLK_DIV1 |
DTIM_DTMR_FRR | DTIM_DTMR_ORRI | DTIM_DTMR_RST_EN;
return 0;
}
ulong get_timer(ulong base)
{
return (timestamp - base);
}
#endif /* CONFIG_MCFTMR */
/*
* 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)
{
return CONFIG_SYS_HZ;
}
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