[people/ms/u-boot.git] / arch / arm / cpu / tegra-common / timer.c

/*
 * (C) Copyright 2010,2011
 * NVIDIA Corporation <www.nvidia.com>
 *
 * (C) Copyright 2008
 * Texas Instruments
 *
 * Richard Woodruff <r-woodruff2@ti.com>
 * Syed Moahmmed Khasim <khasim@ti.com>
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <mgroeger@sysgo.de>
 * Alex Zuepke <azu@sysgo.de>
 *
 * (C) Copyright 2002
 * Gary Jennejohn, DENX Software Engineering, <garyj@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/io.h>
#include <asm/arch/tegra20.h>
#include <asm/arch/timer.h>

DECLARE_GLOBAL_DATA_PTR;

/* counter runs at 1MHz */
#define TIMER_CLK	1000000
#define TIMER_LOAD_VAL	0xffffffff

/* timer without interrupts */
ulong get_timer(ulong base)
{
	return get_timer_masked() - base;
}

/* delay x useconds */
void __udelay(unsigned long usec)
{
	long tmo = usec * (TIMER_CLK / 1000) / 1000;
	unsigned long now, last = timer_get_us();

	while (tmo > 0) {
		now = timer_get_us();
		if (last > now) /* count up timer overflow */
			tmo -= TIMER_LOAD_VAL - last + now;
		else
			tmo -= now - last;
		last = now;
	}
}

ulong get_timer_masked(void)
{
	ulong now;

	/* current tick value */
	now = timer_get_us() / (TIMER_CLK / CONFIG_SYS_HZ);

	if (now >= gd->lastinc)	/* normal mode (non roll) */
		/* move stamp forward with absolute diff ticks */
		gd->tbl += (now - gd->lastinc);
	else	/* we have rollover of incrementer */
		gd->tbl += ((TIMER_LOAD_VAL / (TIMER_CLK / CONFIG_SYS_HZ))
				- gd->lastinc) + now;
	gd->lastinc = now;
	return gd->tbl;
}

/*
 * This function is derived from PowerPC code (read timebase as long long).
 * On ARM 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 ARM it returns the number of timer ticks per second.
 */
ulong get_tbclk(void)
{
	return CONFIG_SYS_HZ;
}

unsigned long timer_get_us(void)
{
	struct timerus *timer_base = (struct timerus *)NV_PA_TMRUS_BASE;

	return readl(&timer_base->cntr_1us);
}
Commit	Line	Data
3f82b1d3 TW	1	/*
	2	* (C) Copyright 2010,2011
	3	* NVIDIA Corporation <www.nvidia.com>
	4	*
	5	* (C) Copyright 2008
	6	* Texas Instruments
	7	*
	8	* Richard Woodruff <r-woodruff2@ti.com>
	9	* Syed Moahmmed Khasim <khasim@ti.com>
	10	*
	11	* (C) Copyright 2002
	12	* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
	13	* Marius Groeger <mgroeger@sysgo.de>
	14	* Alex Zuepke <azu@sysgo.de>
	15	*
	16	* (C) Copyright 2002
	17	* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
	18	*
	19	* See file CREDITS for list of people who contributed to this
	20	* project.
	21	*
	22	* This program is free software; you can redistribute it and/or
	23	* modify it under the terms of the GNU General Public License as
	24	* published by the Free Software Foundation; either version 2 of
	25	* the License, or (at your option) any later version.
	26	*
	27	* This program is distributed in the hope that it will be useful,
	28	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	29	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	30	* GNU General Public License for more details.
	31	*
	32	* You should have received a copy of the GNU General Public License
	33	* along with this program; if not, write to the Free Software
	34	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	35	* MA 02111-1307 USA
	36	*/
	37
	38	#include <common.h>
	39	#include <asm/io.h>
00a2749d	40	#include <asm/arch/tegra20.h>
39d3416f	41	#include <asm/arch/timer.h>
3f82b1d3 TW	42
	43	DECLARE_GLOBAL_DATA_PTR;
	44
3f82b1d3	45	/* counter runs at 1MHz */
39d3416f	46	#define TIMER_CLK 1000000
3f82b1d3 TW	47	#define TIMER_LOAD_VAL 0xffffffff
	48
	49	/* timer without interrupts */
3f82b1d3 TW	50	ulong get_timer(ulong base)
	51	{
	52	return get_timer_masked() - base;
	53	}
	54
3f82b1d3 TW	55	/* delay x useconds */
	56	void __udelay(unsigned long usec)
	57	{
	58	long tmo = usec * (TIMER_CLK / 1000) / 1000;
39d3416f	59	unsigned long now, last = timer_get_us();
3f82b1d3 TW	60
3f82b1d3 TW	61	while (tmo > 0) {
39d3416f	62	now = timer_get_us();
3f82b1d3 TW	63	if (last > now) /* count up timer overflow */
	64	tmo -= TIMER_LOAD_VAL - last + now;
	65	else
	66	tmo -= now - last;
	67	last = now;
	68	}
	69	}
	70
3f82b1d3 TW	71	ulong get_timer_masked(void)
	72	{
	73	ulong now;
	74
	75	/* current tick value */
39d3416f	76	now = timer_get_us() / (TIMER_CLK / CONFIG_SYS_HZ);
3f82b1d3 TW	77
	78	if (now >= gd->lastinc) /* normal mode (non roll) */
	79	/* move stamp forward with absolute diff ticks */
	80	gd->tbl += (now - gd->lastinc);
	81	else /* we have rollover of incrementer */
	82	gd->tbl += ((TIMER_LOAD_VAL / (TIMER_CLK / CONFIG_SYS_HZ))
	83	- gd->lastinc) + now;
	84	gd->lastinc = now;
	85	return gd->tbl;
	86	}
	87
	88	/*
	89	* This function is derived from PowerPC code (read timebase as long long).
	90	* On ARM it just returns the timer value.
	91	*/
	92	unsigned long long get_ticks(void)
	93	{
	94	return get_timer(0);
	95	}
	96
	97	/*
	98	* This function is derived from PowerPC code (timebase clock frequency).
	99	* On ARM it returns the number of timer ticks per second.
	100	*/
	101	ulong get_tbclk(void)
	102	{
	103	return CONFIG_SYS_HZ;
	104	}
39d3416f SG	105
	106	unsigned long timer_get_us(void)
	107	{
	108	struct timerus timer_base = (struct timerus )NV_PA_TMRUS_BASE;
	109
	110	return readl(&timer_base->cntr_1us);
	111	}