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/*
* (C) Copyright 2007
* Nobobuhiro Iwamatsu <iwamatsu@nigauri.org>
*
* (C) Copyright 2003
* 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/processor.h>
#define TMU_MAX_COUNTER (~0UL)
static void tmu_timer_start (unsigned int timer)
{
if (timer > 2)
return;
*((volatile unsigned char *) TSTR) |= (1 << timer);
}
static void tmu_timer_stop (unsigned int timer)
{
u8 val = *((volatile u8 *)TSTR);
if (timer > 2)
return;
*((volatile unsigned char *)TSTR) = val &~(1 << timer);
}
int timer_init (void)
{
/* Divide clock by 4 */
*(volatile u16 *)TCR0 = 0;
tmu_timer_stop(0);
tmu_timer_start(0);
return 0;
}
/*
In theory we should return a true 64bit value (ie something that doesn't
overflow). However, we don't. Therefore if TMU runs at fastest rate of
6.75 MHz this value will wrap after u-boot has been running for approx
10 minutes.
*/
unsigned long long get_ticks (void)
{
return (0 - *((volatile u32 *) TCNT0));
}
unsigned long get_timer (unsigned long base)
{
return ((0 - *((volatile u32 *) TCNT0)) - base);
}
void set_timer (unsigned long t)
{
*((volatile unsigned int *) TCNT0) = (0 - t);
}
void reset_timer (void)
{
tmu_timer_stop(0);
set_timer (0);
tmu_timer_start(0);
}
void udelay (unsigned long usec)
{
unsigned int start = get_timer (0);
unsigned int end = start + (usec * ((CONFIG_SYS_HZ + 500000) / 1000000));
while (get_timer (0) < end)
continue;
}
unsigned long get_tbclk (void)
{
return CONFIG_SYS_HZ;
}
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