mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-11 15:37:23 +00:00
b54384e3ba
actually the timer init use the interrupt_init as init callback which make the interrupt and timer implementation difficult to follow so now rename it as int timer_init(void) and use interrupt_init for interrupt btw also remane the corresponding file to the functionnality implemented as ixp arch implement two timer - one based on interrupt - so all the timer related code is moved to timer.c Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
137 lines
3.4 KiB
C
137 lines
3.4 KiB
C
/*
|
|
* (C) Copyright 2009
|
|
* 2N Telekomunikace, <www.2n.cz>
|
|
*
|
|
* (C) Copyright 2003
|
|
* Texas Instruments, <www.ti.com>
|
|
*
|
|
* (C) Copyright 2002
|
|
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
|
|
* Marius Groeger <mgroeger@sysgo.de>
|
|
*
|
|
* (C) Copyright 2002
|
|
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
|
|
* 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 <arm925t.h>
|
|
#include <configs/omap1510.h>
|
|
#include <asm/io.h>
|
|
|
|
#define TIMER_LOAD_VAL 0xffffffff
|
|
#define TIMER_CLOCK (CONFIG_SYS_CLK_FREQ / (2 << CONFIG_SYS_PTV))
|
|
|
|
static uint32_t timestamp;
|
|
static uint32_t lastdec;
|
|
|
|
/* nothing really to do with interrupts, just starts up a counter. */
|
|
int timer_init (void)
|
|
{
|
|
/* Start the decrementer ticking down from 0xffffffff */
|
|
__raw_writel(TIMER_LOAD_VAL, CONFIG_SYS_TIMERBASE + LOAD_TIM);
|
|
__raw_writel(MPUTIM_ST | MPUTIM_AR | MPUTIM_CLOCK_ENABLE |
|
|
(CONFIG_SYS_PTV << MPUTIM_PTV_BIT),
|
|
CONFIG_SYS_TIMERBASE + CNTL_TIMER);
|
|
|
|
/* init the timestamp and lastdec value */
|
|
reset_timer_masked();
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* timer without interrupts
|
|
*/
|
|
|
|
void reset_timer (void)
|
|
{
|
|
reset_timer_masked ();
|
|
}
|
|
|
|
ulong get_timer (ulong base)
|
|
{
|
|
return get_timer_masked () - base;
|
|
}
|
|
|
|
void set_timer (ulong t)
|
|
{
|
|
timestamp = t;
|
|
}
|
|
|
|
/* delay x useconds AND preserve advance timestamp value */
|
|
void udelay (unsigned long usec)
|
|
{
|
|
int32_t tmo = usec * (TIMER_CLOCK / 1000) / 1000;
|
|
uint32_t now, last = __raw_readl(CONFIG_SYS_TIMERBASE + READ_TIM);
|
|
|
|
while (tmo > 0) {
|
|
now = __raw_readl(CONFIG_SYS_TIMERBASE + READ_TIM);
|
|
if (last < now) /* count down timer underflow */
|
|
tmo -= TIMER_LOAD_VAL - now + last;
|
|
else
|
|
tmo -= last - now;
|
|
last = now;
|
|
}
|
|
}
|
|
|
|
void reset_timer_masked (void)
|
|
{
|
|
/* reset time */
|
|
lastdec = __raw_readl(CONFIG_SYS_TIMERBASE + READ_TIM) /
|
|
(TIMER_CLOCK / CONFIG_SYS_HZ);
|
|
timestamp = 0; /* start "advancing" time stamp from 0 */
|
|
}
|
|
|
|
ulong get_timer_masked (void)
|
|
{
|
|
uint32_t now = __raw_readl(CONFIG_SYS_TIMERBASE + READ_TIM) /
|
|
(TIMER_CLOCK / CONFIG_SYS_HZ);
|
|
if (lastdec < now) /* count down timer underflow */
|
|
timestamp += TIMER_LOAD_VAL / (TIMER_CLOCK / CONFIG_SYS_HZ) -
|
|
now + lastdec;
|
|
else
|
|
timestamp += lastdec - now;
|
|
lastdec = now;
|
|
|
|
return timestamp;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|