mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-12 16:07:30 +00:00
17659d7de9
In some circumstances, reset_timer_masked() was called be timer_init() in order to perform architecture specific timer initialisation. In such cases, the required code in reset_timer_masked() has been moved into timer_init()
113 lines
2.5 KiB
C
113 lines
2.5 KiB
C
/*
|
|
* (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 <asm/arch/pxa-regs.h>
|
|
#include <asm/io.h>
|
|
#include <common.h>
|
|
#include <div64.h>
|
|
|
|
#ifdef CONFIG_USE_IRQ
|
|
#error: interrupts not implemented yet
|
|
#endif
|
|
|
|
#if defined(CONFIG_PXA27X) || defined(CONFIG_CPU_MONAHANS)
|
|
#define TIMER_FREQ_HZ 3250000
|
|
#elif defined(CONFIG_PXA250)
|
|
#define TIMER_FREQ_HZ 3686400
|
|
#else
|
|
#error "Timer frequency unknown - please config PXA CPU type"
|
|
#endif
|
|
|
|
static inline unsigned long long tick_to_time(unsigned long long tick)
|
|
{
|
|
tick *= CONFIG_SYS_HZ;
|
|
do_div(tick, TIMER_FREQ_HZ);
|
|
return tick;
|
|
}
|
|
|
|
static inline unsigned long long us_to_tick(unsigned long long us)
|
|
{
|
|
us = us * TIMER_FREQ_HZ + 999999;
|
|
do_div(us, 1000000);
|
|
return us;
|
|
}
|
|
|
|
int timer_init (void)
|
|
{
|
|
writel(0, OSCR);
|
|
|
|
return 0;
|
|
}
|
|
|
|
ulong get_timer (ulong base)
|
|
{
|
|
return get_timer_masked () - base;
|
|
}
|
|
|
|
void __udelay (unsigned long usec)
|
|
{
|
|
udelay_masked (usec);
|
|
}
|
|
|
|
ulong get_timer_masked (void)
|
|
{
|
|
return tick_to_time(get_ticks());
|
|
}
|
|
|
|
void udelay_masked (unsigned long usec)
|
|
{
|
|
unsigned long long tmp;
|
|
ulong tmo;
|
|
|
|
tmo = us_to_tick(usec);
|
|
tmp = get_ticks() + tmo; /* get current timestamp */
|
|
|
|
while (get_ticks() < tmp) /* loop till event */
|
|
/*NOP*/;
|
|
|
|
}
|
|
|
|
/*
|
|
* 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 readl(OSCR);
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
ulong tbclk;
|
|
tbclk = TIMER_FREQ_HZ;
|
|
return tbclk;
|
|
}
|