intersil.c

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/*
 * arch/m68k/sun3/intersil.c
 *
 * basic routines for accessing the intersil clock within the sun3 machines
 *
 * started 11/12/1999 Sam Creasey
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/kernel.h>
#include <linux/rtc.h>

#include <asm/errno.h>
#include <asm/rtc.h>
#include <asm/intersil.h>


/* bits to set for start/run of the intersil */
#define STOP_VAL (INTERSIL_STOP | INTERSIL_INT_ENABLE | INTERSIL_24H_MODE)
#define START_VAL (INTERSIL_RUN | INTERSIL_INT_ENABLE | INTERSIL_24H_MODE)

/* does this need to be implemented? */
unsigned long sun3_gettimeoffset(void)
{
  return 1;
}


/* get/set hwclock */

int sun3_hwclk(int set, struct rtc_time *t)
{
    volatile struct intersil_dt *todintersil;
    unsigned long flags;

        todintersil = (struct intersil_dt *) &intersil_clock->counter;

    local_irq_save(flags);

    intersil_clock->cmd_reg = STOP_VAL;

    /* set or read the clock */
    if(set) {
        todintersil->csec = 0;
        todintersil->hour = t->tm_hour;
        todintersil->minute = t->tm_min;
        todintersil->second = t->tm_sec;
        todintersil->month = t->tm_mon;
        todintersil->day = t->tm_mday;
        todintersil->year = t->tm_year - 68;
        todintersil->weekday = t->tm_wday;
    } else {
        /* read clock */
        t->tm_sec = todintersil->csec;
        t->tm_hour = todintersil->hour;
        t->tm_min = todintersil->minute;
        t->tm_sec = todintersil->second;
        t->tm_mon = todintersil->month;
        t->tm_mday = todintersil->day;
        t->tm_year = todintersil->year + 68;
        t->tm_wday = todintersil->weekday;
    }

    intersil_clock->cmd_reg = START_VAL;

    local_irq_restore(flags);

    return 0;

}