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/*
* (C) Copyright 2004
* DAVE Srl
* http://www.dave-tech.it
* http://www.wawnet.biz
* mailto:info@wawnet.biz
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/hardware.h>
/* we always count down the max. */
#define TIMER_LOAD_VAL 0xffff
/* macro to read the 16 bit timer */
#define READ_TIMER (TCNTO1 & 0xffff)
#ifdef CONFIG_USE_IRQ
#error CONFIG_USE_IRQ NOT supported
#endif
static ulong timestamp;
static ulong lastdec;
int timer_init (void)
{
TCFG0 = 0x000000E9;
TCFG1 = 0x00000004;
TCON = 0x00000900;
TCNTB1 = TIMER_LOAD_VAL;
TCMPB1 = 0;
TCON = 0x00000B00;
TCON = 0x00000900;
lastdec = TCNTB1 = TIMER_LOAD_VAL;
timestamp = 0;
return 0;
}
/*
* timer without interrupts
*/
ulong get_timer (ulong base)
{
return get_timer_masked () - base;
}
void __udelay (unsigned long usec)
{
ulong tmo;
tmo = usec / 1000;
tmo *= CONFIG_SYS_HZ;
tmo /= 8;
tmo += get_timer (0);
while (get_timer_masked () < tmo)
/*NOP*/;
}
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;
if (usec >= 1000) {
tmo = usec / 1000;
tmo *= CONFIG_SYS_HZ;
tmo /= 8;
} else {
tmo = usec * CONFIG_SYS_HZ;
tmo /= (1000*8);
}
endtime = get_timer(0) + tmo;
do {
ulong now = get_timer_masked ();
diff = endtime - now;
} while (diff >= 0);
}
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