mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 08:57:58 +00:00
101 lines
2.3 KiB
C
101 lines
2.3 KiB
C
/*
|
|
* Marvell PXA2xx/3xx timer driver
|
|
*
|
|
* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
|
|
*
|
|
* 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>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
#define TIMER_LOAD_VAL 0xffffffff
|
|
|
|
#define timestamp (gd->tbl)
|
|
#define lastinc (gd->lastinc)
|
|
|
|
#if defined(CONFIG_CPU_PXA27X) || defined(CONFIG_CPU_MONAHANS)
|
|
#define TIMER_FREQ_HZ 3250000
|
|
#elif defined(CONFIG_CPU_PXA25X)
|
|
#define TIMER_FREQ_HZ 3686400
|
|
#else
|
|
#error "Timer frequency unknown - please config PXA CPU type"
|
|
#endif
|
|
|
|
static unsigned long long tick_to_time(unsigned long long tick)
|
|
{
|
|
return tick * CONFIG_SYS_HZ / TIMER_FREQ_HZ;
|
|
}
|
|
|
|
static unsigned long long us_to_tick(unsigned long long us)
|
|
{
|
|
return (us * TIMER_FREQ_HZ) / 1000000;
|
|
}
|
|
|
|
int timer_init(void)
|
|
{
|
|
writel(0, OSCR);
|
|
return 0;
|
|
}
|
|
|
|
unsigned long long get_ticks(void)
|
|
{
|
|
/* Current tick value */
|
|
uint32_t now = readl(OSCR);
|
|
|
|
if (now >= lastinc) {
|
|
/*
|
|
* Normal mode (non roll)
|
|
* Move stamp forward with absolute diff ticks
|
|
*/
|
|
timestamp += (now - lastinc);
|
|
} else {
|
|
/* We have rollover of incrementer */
|
|
timestamp += (TIMER_LOAD_VAL - lastinc) + now;
|
|
}
|
|
|
|
lastinc = now;
|
|
return timestamp;
|
|
}
|
|
|
|
ulong get_timer(ulong base)
|
|
{
|
|
return tick_to_time(get_ticks()) - base;
|
|
}
|
|
|
|
void __udelay(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*/;
|
|
}
|
|
|
|
ulong get_tbclk(void)
|
|
{
|
|
return TIMER_FREQ_HZ;
|
|
}
|