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/*
* (C) Copyright 2002
* Daniel Engström, Omicron Ceti AB <daniel@omicron.se>.
*
* 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
*/
/* stuff specific for the sc520, but independent of implementation */
#include <common.h>
#include <asm/interrupt.h>
#include <asm/ic/sc520.h>
void reset_timer(void)
{
write_mmcr_word(SC520_GPTMR0CNT, 0);
write_mmcr_word(SC520_GPTMR0CTL, 0x6001);
}
ulong get_timer(ulong base)
{
/* fixme: 30 or 33 */
return read_mmcr_word(SC520_GPTMR0CNT) / 33;
}
void set_timer(ulong t)
{
/* FixMe: use two cascade coupled timers */
write_mmcr_word(SC520_GPTMR0CTL, 0x4001);
write_mmcr_word(SC520_GPTMR0CNT, t*33);
write_mmcr_word(SC520_GPTMR0CTL, 0x6001);
}
void udelay(unsigned long usec)
{
int m=0;
long u;
read_mmcr_word(SC520_SWTMRMILLI);
read_mmcr_word(SC520_SWTMRMICRO);
#if 0
/* do not enable this line, udelay is used in the serial driver -> recursion */
printf("udelay: %ld m.u %d.%d tm.tu %d.%d\n", usec, m, u, tm, tu);
#endif
while (1) {
m += read_mmcr_word(SC520_SWTMRMILLI);
u = read_mmcr_word(SC520_SWTMRMICRO) + (m * 1000);
if (usec <= u) {
break;
}
}
}
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