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/*
* Copyright (c) 2006
* Ingenic Semiconductor, <jlwei@ingenic.cn>
*
* 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 <config.h>
#include <common.h>
#include <asm/io.h>
#include <asm/jz4740.h>
#define TIMER_CHAN 0
#define TIMER_FDATA 0xffff /* Timer full data value */
DECLARE_GLOBAL_DATA_PTR;
static struct jz4740_tcu *tcu = (struct jz4740_tcu *)JZ4740_TCU_BASE;
void reset_timer_masked(void)
{
/* reset time */
gd->lastinc = readw(&tcu->tcnt0);
gd->tbl = 0;
}
ulong get_timer_masked(void)
{
ulong now = readw(&tcu->tcnt0);
if (gd->lastinc <= now)
gd->tbl += now - gd->lastinc; /* normal mode */
else {
/* we have an overflow ... */
gd->tbl += TIMER_FDATA + now - gd->lastinc;
}
gd->lastinc = now;
return gd->tbl;
}
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);
}
int timer_init(void)
{
writew(TCU_TCSR_PRESCALE256 | TCU_TCSR_EXT_EN, &tcu->tcsr0);
writew(0, &tcu->tcnt0);
writew(0, &tcu->tdhr0);
writew(TIMER_FDATA, &tcu->tdfr0);
/* mask irqs */
writel((1 << TIMER_CHAN) | (1 << (TIMER_CHAN + 16)), &tcu->tmsr);
writel(1 << TIMER_CHAN, &tcu->tscr); /* enable timer clock */
writeb(1 << TIMER_CHAN, &tcu->tesr); /* start counting up */
gd->lastinc = 0;
gd->tbl = 0;
return 0;
}
void reset_timer(void)
{
reset_timer_masked();
}
ulong get_timer(ulong base)
{
return get_timer_masked() - base;
}
void set_timer(ulong t)
{
gd->tbl = 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)
;
}
/*
* This function is derived from PowerPC code (read timebase as long long).
* On MIPS 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 MIPS it returns the number of timer ticks per second.
*/
ulong get_tbclk(void)
{
return CONFIG_SYS_HZ;
}
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