/*
+ * (C) Copyright 2008-2011
+ * Graeme Russ, <graeme.russ@gmail.com>
+ *
* (C) Copyright 2002
- * Daniel Engström, Omicron Ceti AB <daniel@omicron.se>.
+ * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
*
* See file CREDITS for list of people who contributed to this
* project.
* MA 02111-1307 USA
*/
-/* stuff specific for the sc520, but independent of implementation */
-
#include <common.h>
+#include <asm/io.h>
#include <asm/interrupt.h>
#include <asm/ic/sc520.h>
void sc520_timer_isr(void)
{
/* Ack the GP Timer Interrupt */
- sc520_mmcr->gptmrsta = 0x02;
+ writeb(0x02, &sc520_mmcr->gptmrsta);
}
int timer_init(void)
irq_install_handler (0, timer_isr, NULL);
/* Map GP Timer 1 to Master PIC IR0 */
- sc520_mmcr->gp_tmr_int_map[1] = 0x01;
+ writeb(0x01, &sc520_mmcr->gp_tmr_int_map[1]);
/* Disable GP Timers 1 & 2 - Allow configuration writes */
- sc520_mmcr->gptmr1ctl = 0x4000;
- sc520_mmcr->gptmr2ctl = 0x4000;
+ writew(0x4000, &sc520_mmcr->gptmr1ctl);
+ writew(0x4000, &sc520_mmcr->gptmr2ctl);
/* Reset GP Timers 1 & 2 */
- sc520_mmcr->gptmr1cnt = 0x0000;
- sc520_mmcr->gptmr2cnt = 0x0000;
+ writew(0x0000, &sc520_mmcr->gptmr1cnt);
+ writew(0x0000, &sc520_mmcr->gptmr2cnt);
/* Setup GP Timer 2 as a 100kHz (10us) prescaler */
- sc520_mmcr->gptmr2maxcmpa = 83;
- sc520_mmcr->gptmr2ctl = 0xc001;
+ writew(83, &sc520_mmcr->gptmr2maxcmpa);
+ writew(0xc001, &sc520_mmcr->gptmr2ctl);
/* Setup GP Timer 1 as a 1000 Hz (1ms) interrupt generator */
- sc520_mmcr->gptmr1maxcmpa = 100;
- sc520_mmcr->gptmr1ctl = 0xe009;
+ writew(100, &sc520_mmcr->gptmr1maxcmpa);
+ writew(0xe009, &sc520_mmcr->gptmr1ctl);
unmask_irq (0);
/* Clear the GP Timer 1 status register to get the show rolling*/
- sc520_mmcr->gptmrsta = 0x02;
+ writeb(0x02, &sc520_mmcr->gptmrsta);
return 0;
}
+/* Allow boards to override udelay implementation */
void __udelay(unsigned long usec)
+ __attribute__((weak, alias("sc520_udelay")));
+
+void sc520_udelay(unsigned long usec)
{
int m = 0;
long u;
long temp;
- temp = sc520_mmcr->swtmrmilli;
- temp = sc520_mmcr->swtmrmicro;
+ temp = readw(&sc520_mmcr->swtmrmilli);
+ temp = readw(&sc520_mmcr->swtmrmicro);
do {
- m += sc520_mmcr->swtmrmilli;
- u = sc520_mmcr->swtmrmicro + (m * 1000);
+ m += readw(&sc520_mmcr->swtmrmilli);
+ u = readw(&sc520_mmcr->swtmrmicro) + (m * 1000);
} while (u < usec);
}