73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* (C) Copyright 2000, 2001
|
|
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/io.h>
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* This function is intended for SHORT delays only.
|
|
* It will overflow at around 10 seconds @ 400MHz,
|
|
* or 20 seconds @ 200MHz.
|
|
*/
|
|
unsigned long usec2ticks(unsigned long usec)
|
|
{
|
|
ulong ticks;
|
|
|
|
if (usec < 1000) {
|
|
ticks = ((usec * (get_tbclk()/1000)) + 500) / 1000;
|
|
} else {
|
|
ticks = ((usec / 10) * (get_tbclk() / 100000));
|
|
}
|
|
|
|
return (ticks);
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* We implement the delay by converting the delay (the number of
|
|
* microseconds to wait) into a number of time base ticks; then we
|
|
* watch the time base until it has incremented by that amount.
|
|
*/
|
|
void __udelay(unsigned long usec)
|
|
{
|
|
ulong ticks = usec2ticks (usec);
|
|
wait_ticks (ticks);
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
#ifndef CONFIG_NAND_SPL
|
|
unsigned long ticks2usec(unsigned long ticks)
|
|
{
|
|
ulong tbclk = get_tbclk();
|
|
|
|
/* usec = ticks * 1000000 / tbclk
|
|
* Multiplication would overflow at ~4.2e3 ticks,
|
|
* so we break it up into
|
|
* usec = ( ( ticks * 1000) / tbclk ) * 1000;
|
|
*/
|
|
ticks *= 1000L;
|
|
ticks /= tbclk;
|
|
ticks *= 1000L;
|
|
|
|
return ((ulong)ticks);
|
|
}
|
|
#endif
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
int timer_init(void)
|
|
{
|
|
unsigned long temp;
|
|
|
|
/* reset */
|
|
asm volatile("li %0,0 ; mttbl %0 ; mttbu %0;"
|
|
: "=&r"(temp) );
|
|
|
|
return (0);
|
|
}
|
|
/* ------------------------------------------------------------------------- */
|