mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-30 00:21:06 +00:00
107 lines
2.8 KiB
C
107 lines
2.8 KiB
C
/*
|
|
* (C) Copyright 2000, 2001
|
|
* Wolfgang Denk, DENX Software Engineering, wd@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>
|
|
|
|
#ifndef CONFIG_WD_PERIOD
|
|
# define CONFIG_WD_PERIOD (10 * 1000 * 1000) /* 10 seconds default*/
|
|
#endif
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* 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, kv;
|
|
|
|
do {
|
|
kv = usec > CONFIG_WD_PERIOD ? CONFIG_WD_PERIOD : usec;
|
|
ticks = usec2ticks (kv);
|
|
wait_ticks (ticks);
|
|
usec -= kv;
|
|
} while(usec);
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
#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 init_timebase (void)
|
|
{
|
|
#if defined(CONFIG_5xx) || defined(CONFIG_8xx)
|
|
volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
|
|
|
|
/* unlock */
|
|
immap->im_sitk.sitk_tbk = KAPWR_KEY;
|
|
#endif
|
|
|
|
/* reset */
|
|
asm ("li 3,0 ; mttbu 3 ; mttbl 3 ;");
|
|
|
|
#if defined(CONFIG_5xx) || defined(CONFIG_8xx)
|
|
/* enable */
|
|
immap->im_sit.sit_tbscr |= TBSCR_TBE;
|
|
#endif
|
|
return (0);
|
|
}
|
|
/* ------------------------------------------------------------------------- */
|