85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
/*
|
|
* (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 sc520_timer_isr(void)
|
|
{
|
|
/* Ack the GP Timer Interrupt */
|
|
sc520_mmcr->gptmrsta = 0x02;
|
|
}
|
|
|
|
int timer_init(void)
|
|
{
|
|
/* Register the SC520 specific timer interrupt handler */
|
|
register_timer_isr (sc520_timer_isr);
|
|
|
|
/* Install interrupt handler for GP Timer 1 */
|
|
irq_install_handler (0, timer_isr, NULL);
|
|
|
|
/* Map GP Timer 1 to Master PIC IR0 */
|
|
sc520_mmcr->gp_tmr_int_map[1] = 0x01;
|
|
|
|
/* Disable GP Timers 1 & 2 - Allow configuration writes */
|
|
sc520_mmcr->gptmr1ctl = 0x4000;
|
|
sc520_mmcr->gptmr2ctl = 0x4000;
|
|
|
|
/* Reset GP Timers 1 & 2 */
|
|
sc520_mmcr->gptmr1cnt = 0x0000;
|
|
sc520_mmcr->gptmr2cnt = 0x0000;
|
|
|
|
/* Setup GP Timer 2 as a 100kHz (10us) prescaler */
|
|
sc520_mmcr->gptmr2maxcmpa = 83;
|
|
sc520_mmcr->gptmr2ctl = 0xc001;
|
|
|
|
/* Setup GP Timer 1 as a 1000 Hz (1ms) interrupt generator */
|
|
sc520_mmcr->gptmr1maxcmpa = 100;
|
|
sc520_mmcr->gptmr1ctl = 0xe009;
|
|
|
|
unmask_irq (0);
|
|
|
|
/* Clear the GP Timer 1 status register to get the show rolling*/
|
|
sc520_mmcr->gptmrsta = 0x02;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void __udelay(unsigned long usec)
|
|
{
|
|
int m = 0;
|
|
long u;
|
|
long temp;
|
|
|
|
temp = sc520_mmcr->swtmrmilli;
|
|
temp = sc520_mmcr->swtmrmicro;
|
|
|
|
do {
|
|
m += sc520_mmcr->swtmrmilli;
|
|
u = sc520_mmcr->swtmrmicro + (m * 1000);
|
|
} while (u < usec);
|
|
}
|