lib_m68k/time.c

/*
 * (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>
#include <asm/timer.h>
#include <asm/immap.h>

#ifdef	CONFIG_M5271
#include <asm/m5271.h>
#include <asm/immap_5271.h>
#endif

#ifdef	CONFIG_M5272
#include <asm/m5272.h>
#include <asm/immap_5272.h>
#endif

#ifdef	CONFIG_M5282
#include <asm/m5282.h>
#endif

#ifdef	CONFIG_M5249
#include <asm/m5249.h>
#include <asm/immap_5249.h>
#endif

DECLARE_GLOBAL_DATA_PTR;

static ulong timestamp;
#if defined(CONFIG_M5282) || defined(CONFIG_M5271)
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) || defined(CONFIG_M5271)

void udelay(unsigned long usec)
{
	volatile unsigned short *timerp;
	uint tmp;

	timerp = (volatile unsigned short *)(CFG_MBAR + MCFTIMER_BASE3);

	while (usec > 0) {
		if (usec > 65000)
			tmp = 65000;
		else
			tmp = usec;
		usec = usec - tmp;

		/* Set up TIMER 3 as timebase clock */
		timerp[MCFTIMER_PCSR] = MCFTIMER_PCSR_OVW;
		timerp[MCFTIMER_PMR] = 0;
		/* set period to 1 us */
		timerp[MCFTIMER_PCSR] =
#ifdef CONFIG_M5271
		    (6 << 8) | MCFTIMER_PCSR_EN | MCFTIMER_PCSR_OVW;
#else				/* !CONFIG_M5271 */
		    (5 << 8) | MCFTIMER_PCSR_EN | MCFTIMER_PCSR_OVW;
#endif				/* CONFIG_M5271 */

		timerp[MCFTIMER_PMR] = tmp;
		while (timerp[MCFTIMER_PCNTR] > 0) ;
	}
}

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] =
#ifdef CONFIG_M5271
	    (6 << 8) | MCFTIMER_PCSR_EN | MCFTIMER_PCSR_OVW;
#else				/* !CONFIG_M5271 */
	    (5 << 8) | MCFTIMER_PCSR_EN | MCFTIMER_PCSR_OVW;
#endif				/* CONFIG_M5271 */
}

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

#if defined(CONFIG_M5249)
/*
 * We use timer 1 which is running with a period of 1 us
 */
void udelay(unsigned long usec)
{
	volatile timer_t *timerp = (timer_t *) (CFG_MBAR + MCFTIMER_BASE1);
	uint start, now, tmp;

	while (usec > 0) {
		if (usec > 65000)
			tmp = 65000;
		else
			tmp = usec;
		usec = usec - tmp;

		/* Set up TIMER 1 as timebase clock */
		timerp->timer_tmr = MCFTIMER_TMR_DISABLE;
		timerp->timer_tcn = 0;
		/* set period to 1 us */
		/* on m5249 the system clock is (cpu_clk / 2) -> divide by 2000000 */
		timerp->timer_tmr =
		    (((CFG_CLK / 2000000) -
		      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_BASE2);

	/* check for timer 2 interrupts */
	if ((mbar_readLong(MCFSIM_IPR) & 0x00000400) == 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_BASE2);

	timestamp = 0;

	/* Set up TIMER 2 as clock */
	timerp->timer_tmr = MCFTIMER_TMR_DISABLE;

	/* initialize and enable timer 2 interrupt */
	irq_install_handler(31, mcf_timer_interrupt, 0);
	mbar_writeLong(MCFSIM_IMR, mbar_readLong(MCFSIM_IMR) & ~0x00000400);
	mbar_writeByte(MCFSIM_TIMER2ICR,
		       MCFSIM_ICR_AUTOVEC | MCFSIM_ICR_LEVEL7 |
		       MCFSIM_ICR_PRI3);

	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 */
	/* on m5249 the system clock is (cpu_clk / 2) -> divide by 2000000 */
	timerp->timer_tmr =
	    (((CFG_CLK / 2000000) -
	      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_MCFTMR)
#ifndef CFG_UDELAY_BASE
#	error	"uDelay base not defined!"
#endif

#if !defined(CFG_TMR_BASE) || !defined(CFG_INTR_BASE) || !defined(CFG_TMRINTR_NO) || !defined(CFG_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_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_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_TMR_BASE);

	/* check for timer interrupt asserted */
	if ((CFG_TMRPND_REG & CFG_TMRINTR_MASK) == CFG_TMRINTR_PEND) {
		timerp->ter = (DTIM_DTER_CAP | DTIM_DTER_REF);
		timestamp++;
		return;
	}
}

void timer_init(void)
{
	volatile dtmr_t *timerp = (dtmr_t *) (CFG_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_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_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(CFG_PIT_BASE)
#	error	"CFG_PIT_BASE not defined!"
#endif

static unsigned short lastinc;

void udelay(unsigned long usec)
{
	volatile pit_t *timerp = (pit_t *) (CFG_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(CFG_PIT_PRESCALE) | PIT_PCSR_EN;

		timerp->pmr = tmp;
		while (timerp->pcntr > 0) ;
	}
}

void timer_init(void)
{
	volatile pit_t *timerp = (pit_t *) (CFG_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(CFG_PIT_PRESCALE) | PIT_PCSR_EN;
}

void set_timer(ulong t)
{
	volatile pit_t *timerp = (pit_t *) (CFG_PIT_BASE);

	timestamp = 0;
	timerp->pmr = lastinc = 0;
}

ulong get_timer(ulong base)
{
	unsigned short now, diff;
	volatile pit_t *timerp = (pit_t *) (CFG_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);
}

/*
 * 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 = CFG_HZ;
	return tbclk;
}