[people/ms/u-boot.git] / cpu / mcf547x_8x / slicetimer.c

/*
 * (C) Copyright 2007 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>

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)
{
	volatile slt_t *timerp = (slt_t *) (CONFIG_SYS_UDELAY_BASE);
	u32 now, freq;

	/* 1 us period */
	freq = CONFIG_SYS_TIMER_PRESCALER;

	timerp->cr = 0;		/* Disable */
	timerp->tcnt = usec * freq;
	timerp->cr = SLT_CR_TEN;

	now = timerp->cnt;
	while (now != 0)
		now = timerp->cnt;

	timerp->sr |= SLT_SR_ST;
	timerp->cr = 0;
}

void dtimer_interrupt(void *not_used)
{
	volatile 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) {
		timerp->sr |= SLT_SR_ST;
		timestamp++;
		return;
	}
}

void timer_init(void)
{
	volatile slt_t *timerp = (slt_t *) (CONFIG_SYS_TMR_BASE);

	timestamp = 0;

	timerp->cr = 0;		/* disable timer */
	timerp->tcnt = 0;
	timerp->sr = SLT_SR_BE | SLT_SR_ST;	/* clear status */

	/* initialize and enable timer interrupt */
	irq_install_handler(CONFIG_SYS_TMRINTR_NO, dtimer_interrupt, 0);

	/* Interrupt every ms */
	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 */
	timerp->cr = SLT_CR_RUN | SLT_CR_IEN | SLT_CR_TEN;
}

void reset_timer(void)
{
	timestamp = 0;
}

ulong get_timer(ulong base)
{
	return (timestamp - base);
}

void set_timer(ulong t)
{
	timestamp = t;
}
#endif				/* CONFIG_SLTTMR */
Commit	Line	Data
570c0186 TL	1	/*
	2	* (C) Copyright 2007 Freescale Semiconductor, Inc.
	3	* TsiChung Liew (Tsi-Chung.Liew@freescale.com)
	4	*
	5	* See file CREDITS for list of people who contributed to this
	6	* project.
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License as
	10	* published by the Free Software Foundation; either version 2 of
	11	* the License, or (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	21	* MA 02111-1307 USA
	22	*/
	23
	24	#include <common.h>
	25
	26	#include <asm/timer.h>
	27	#include <asm/immap.h>
	28
	29	DECLARE_GLOBAL_DATA_PTR;
	30
	31	static ulong timestamp;
	32
	33	#if defined(CONFIG_SLTTMR)
6d0f6bcf	34	#ifndef CONFIG_SYS_UDELAY_BASE
570c0186 TL	35	# error "uDelay base not defined!"
	36	#endif
	37
6d0f6bcf	38	#if !defined(CONFIG_SYS_TMR_BASE) \|\| !defined(CONFIG_SYS_INTR_BASE) \|\| !defined(CONFIG_SYS_TMRINTR_NO) \|\| !defined(CONFIG_SYS_TMRINTR_MASK)
570c0186 TL	39	# error "TMR_BASE, INTR_BASE, TMRINTR_NO or TMRINTR_MASk not defined!"
	40	#endif
	41	extern void dtimer_intr_setup(void);
	42
	43	void udelay(unsigned long usec)
	44	{
6d0f6bcf	45	volatile slt_t timerp = (slt_t ) (CONFIG_SYS_UDELAY_BASE);
570c0186 TL	46	u32 now, freq;
	47
	48	/* 1 us period */
6d0f6bcf	49	freq = CONFIG_SYS_TIMER_PRESCALER;
570c0186 TL	50
	51	timerp->cr = 0; /* Disable */
	52	timerp->tcnt = usec * freq;
	53	timerp->cr = SLT_CR_TEN;
	54
	55	now = timerp->cnt;
	56	while (now != 0)
	57	now = timerp->cnt;
	58
	59	timerp->sr \|= SLT_SR_ST;
	60	timerp->cr = 0;
	61	}
	62
	63	void dtimer_interrupt(void *not_used)
	64	{
6d0f6bcf	65	volatile slt_t timerp = (slt_t ) (CONFIG_SYS_TMR_BASE);
570c0186 TL	66
570c0186 TL	67	/* check for timer interrupt asserted */
6d0f6bcf	68	if ((CONFIG_SYS_TMRPND_REG & CONFIG_SYS_TMRINTR_MASK) == CONFIG_SYS_TMRINTR_PEND) {
570c0186 TL	69	timerp->sr \|= SLT_SR_ST;
	70	timestamp++;
	71	return;
	72	}
	73	}
	74
	75	void timer_init(void)
	76	{
6d0f6bcf	77	volatile slt_t timerp = (slt_t ) (CONFIG_SYS_TMR_BASE);
570c0186 TL	78
	79	timestamp = 0;
	80
	81	timerp->cr = 0; /* disable timer */
	82	timerp->tcnt = 0;
	83	timerp->sr = SLT_SR_BE \| SLT_SR_ST; /* clear status */
	84
	85	/* initialize and enable timer interrupt */
6d0f6bcf	86	irq_install_handler(CONFIG_SYS_TMRINTR_NO, dtimer_interrupt, 0);
570c0186 TL	87
570c0186 TL	88	/* Interrupt every ms */
6d0f6bcf	89	timerp->tcnt = 1000 * CONFIG_SYS_TIMER_PRESCALER;
570c0186 TL	90
	91	dtimer_intr_setup();
	92
	93	/* set a period of 1us, set timer mode to restart and
	94	enable timer and interrupt */
	95	timerp->cr = SLT_CR_RUN \| SLT_CR_IEN \| SLT_CR_TEN;
	96	}
	97
	98	void reset_timer(void)
	99	{
	100	timestamp = 0;
	101	}
	102
	103	ulong get_timer(ulong base)
	104	{
	105	return (timestamp - base);
	106	}
	107
	108	void set_timer(ulong t)
	109	{
	110	timestamp = t;
	111	}
	112	#endif /* CONFIG_SLTTMR */