mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-25 20:43:32 +00:00
117 lines
2.8 KiB
C
117 lines
2.8 KiB
C
/*
|
|
* (C) Copyright 2010
|
|
* Michael Schwingen, michael@schwingen.org
|
|
*
|
|
* (C) Copyright 2006
|
|
* Stefan Roese, DENX Software Engineering, sr@denx.de.
|
|
*
|
|
* (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>
|
|
*
|
|
* 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/arch/ixp425.h>
|
|
#include <asm/io.h>
|
|
#include <div64.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
/*
|
|
* The IXP42x time-stamp timer runs at 2*OSC_IN (66.666MHz when using a
|
|
* 33.333MHz crystal).
|
|
*/
|
|
static inline unsigned long long tick_to_time(unsigned long long tick)
|
|
{
|
|
tick *= CONFIG_SYS_HZ;
|
|
do_div(tick, CONFIG_IXP425_TIMER_CLK);
|
|
return tick;
|
|
}
|
|
|
|
static inline unsigned long long time_to_tick(unsigned long long time)
|
|
{
|
|
time *= CONFIG_IXP425_TIMER_CLK;
|
|
do_div(time, CONFIG_SYS_HZ);
|
|
return time;
|
|
}
|
|
|
|
static inline unsigned long long us_to_tick(unsigned long long us)
|
|
{
|
|
us = us * CONFIG_IXP425_TIMER_CLK + 999999;
|
|
do_div(us, 1000000);
|
|
return us;
|
|
}
|
|
|
|
unsigned long long get_ticks(void)
|
|
{
|
|
ulong now = readl(IXP425_OSTS_B);
|
|
|
|
if (readl(IXP425_OSST) & IXP425_OSST_TIMER_TS_PEND) {
|
|
/* rollover of timestamp timer register */
|
|
gd->timestamp += (0xFFFFFFFF - gd->lastinc) + now + 1;
|
|
writel(IXP425_OSST_TIMER_TS_PEND, IXP425_OSST);
|
|
} else {
|
|
/* move stamp forward with absolut diff ticks */
|
|
gd->timestamp += (now - gd->lastinc);
|
|
}
|
|
gd->lastinc = now;
|
|
return gd->timestamp;
|
|
}
|
|
|
|
|
|
void reset_timer_masked(void)
|
|
{
|
|
/* capture current timestamp counter */
|
|
gd->lastinc = readl(IXP425_OSTS_B);
|
|
/* start "advancing" time stamp from 0 */
|
|
gd->timestamp = 0;
|
|
}
|
|
|
|
ulong get_timer_masked(void)
|
|
{
|
|
return tick_to_time(get_ticks());
|
|
}
|
|
|
|
ulong get_timer(ulong base)
|
|
{
|
|
return get_timer_masked() - base;
|
|
}
|
|
|
|
/* delay x useconds AND preserve advance timestamp value */
|
|
void __udelay(unsigned long usec)
|
|
{
|
|
unsigned long long tmp;
|
|
|
|
tmp = get_ticks() + us_to_tick(usec);
|
|
|
|
while (get_ticks() < tmp)
|
|
;
|
|
}
|
|
|
|
int timer_init(void)
|
|
{
|
|
writel(IXP425_OSST_TIMER_TS_PEND, IXP425_OSST);
|
|
return 0;
|
|
}
|