mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-13 23:02:59 +00:00
3eb90bad65
According to the PPC reference implementation the udelay() function is responsible for resetting the watchdog timer as frequently as needed. Most other architectures do not meet that requirement, so long-running operations might result in a watchdog reset. This patch adds a generic udelay() function which takes care of resetting the watchdog before calling an architecture-specific __udelay(). Signed-off-by: Ingo van Lil <inguin@gmx.de>
193 lines
3.8 KiB
C
193 lines
3.8 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>
|
|
*
|
|
* (C) Copyright 2002
|
|
* Gary Jennejohn, DENX Software Engineering, <garyj@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>
|
|
#include <lh7a40x.h>
|
|
|
|
static ulong timer_load_val = 0;
|
|
|
|
/* macro to read the 16 bit timer */
|
|
static inline ulong READ_TIMER(void)
|
|
{
|
|
lh7a40x_timers_t* timers = LH7A40X_TIMERS_PTR;
|
|
lh7a40x_timer_t* timer = &timers->timer1;
|
|
|
|
return (timer->value & 0x0000ffff);
|
|
}
|
|
|
|
static ulong timestamp;
|
|
static ulong lastdec;
|
|
|
|
int timer_init (void)
|
|
{
|
|
lh7a40x_timers_t* timers = LH7A40X_TIMERS_PTR;
|
|
lh7a40x_timer_t* timer = &timers->timer1;
|
|
|
|
/* a periodic timer using the 508kHz source */
|
|
timer->control = (TIMER_PER | TIMER_CLK508K);
|
|
|
|
if (timer_load_val == 0) {
|
|
/*
|
|
* 10ms period with 508.469kHz clock = 5084
|
|
*/
|
|
timer_load_val = CONFIG_SYS_HZ/100;
|
|
}
|
|
|
|
/* load value for 10 ms timeout */
|
|
lastdec = timer->load = timer_load_val;
|
|
|
|
/* auto load, start timer */
|
|
timer->control = timer->control | TIMER_EN;
|
|
timestamp = 0;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* timer without interrupts
|
|
*/
|
|
|
|
void reset_timer (void)
|
|
{
|
|
reset_timer_masked ();
|
|
}
|
|
|
|
ulong get_timer (ulong base)
|
|
{
|
|
return (get_timer_masked() - base);
|
|
}
|
|
|
|
void set_timer (ulong t)
|
|
{
|
|
timestamp = t;
|
|
}
|
|
|
|
void __udelay (unsigned long usec)
|
|
{
|
|
ulong tmo,tmp;
|
|
|
|
/* normalize */
|
|
if (usec >= 1000) {
|
|
tmo = usec / 1000;
|
|
tmo *= CONFIG_SYS_HZ;
|
|
tmo /= 1000;
|
|
}
|
|
else {
|
|
if (usec > 1) {
|
|
tmo = usec * CONFIG_SYS_HZ;
|
|
tmo /= (1000*1000);
|
|
}
|
|
else
|
|
tmo = 1;
|
|
}
|
|
|
|
/* check for rollover during this delay */
|
|
tmp = get_timer (0);
|
|
if ((tmp + tmo) < tmp )
|
|
reset_timer_masked(); /* timer would roll over */
|
|
else
|
|
tmo += tmp;
|
|
|
|
while (get_timer_masked () < tmo);
|
|
}
|
|
|
|
void reset_timer_masked (void)
|
|
{
|
|
/* reset time */
|
|
lastdec = READ_TIMER();
|
|
timestamp = 0;
|
|
}
|
|
|
|
ulong get_timer_masked (void)
|
|
{
|
|
ulong now = READ_TIMER();
|
|
|
|
if (lastdec >= now) {
|
|
/* normal mode */
|
|
timestamp += (lastdec - now);
|
|
} else {
|
|
/* we have an overflow ... */
|
|
timestamp += ((lastdec + timer_load_val) - now);
|
|
}
|
|
lastdec = now;
|
|
|
|
return timestamp;
|
|
}
|
|
|
|
void udelay_masked (unsigned long usec)
|
|
{
|
|
ulong tmo;
|
|
ulong endtime;
|
|
signed long diff;
|
|
|
|
/* normalize */
|
|
if (usec >= 1000) {
|
|
tmo = usec / 1000;
|
|
tmo *= CONFIG_SYS_HZ;
|
|
tmo /= 1000;
|
|
} else {
|
|
if (usec > 1) {
|
|
tmo = usec * CONFIG_SYS_HZ;
|
|
tmo /= (1000*1000);
|
|
} else {
|
|
tmo = 1;
|
|
}
|
|
}
|
|
|
|
endtime = get_timer_masked () + tmo;
|
|
|
|
do {
|
|
ulong now = get_timer_masked ();
|
|
diff = endtime - now;
|
|
} while (diff >= 0);
|
|
}
|
|
|
|
/*
|
|
* 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 get_timer(0);
|
|
}
|
|
|
|
/*
|
|
* 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_load_val * 100;
|
|
|
|
return tbclk;
|
|
}
|