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intersil.c

/*
 * 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/system.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;

}


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