mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-26 06:30:39 +00:00
98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
/*
|
|
* (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 * ((CFG_HZ + 500000) / 1000000));
|
|
|
|
while (get_timer (0) < end)
|
|
continue;
|
|
}
|
|
|
|
unsigned long get_tbclk (void)
|
|
{
|
|
return CFG_HZ;
|
|
}
|