Subversion Repositories openrisc_2011-10-31

/*

 * Real Time Clock (MK48T08) for RTEMS on MVME162

 *

 *  Author:

 *    COPYRIGHT (C) 1997

 *    by Katsutoshi Shibuya - BU Denken Co.,Ltd. - Sapporo - JAPAN

 *    ALL RIGHTS RESERVED

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  This material is a part of the MVME162 Board Support Package

 *  for the RTEMS executive. Its licensing policies are those of the

 *  RTEMS above.

 *

 *  $Id: tod.c,v 1.2 2001-09-27 12:00:19 chris Exp $

 */

#include <rtems.h>

#include <tod.h>

#define tod     ((volatile unsigned char *)0xfffc1ff8)

static int      getTod(int n, unsigned char mask)

{

    unsigned char       x;

    x = tod[n]&mask;

    return (x>>4)*10+(x&0x0f);

}

static void     setTod(int n, unsigned char d)

{

    tod[n] = ((d/10)<<4)+(d%10);

}

void    setRealTimeToRTEMS()

{

    rtems_time_of_day   t;

    tod[0] |= 0x40;      /* Stop read register */

    t.year = 1900+getTod(7,0xff);

    t.month = getTod(6,0x1f);

    t.day = getTod(5,0x3f);

    t.hour = getTod(3,0x3f);

    t.minute = getTod(2,0x7f);

    t.second = getTod(1,0x7f);

    t.ticks = 0;

    tod[0] &= 0x3f;      /* Release read register */

    rtems_clock_set(&t);

}

void    setRealTimeFromRTEMS()

{

    rtems_time_of_day   t;

    rtems_clock_get(RTEMS_CLOCK_GET_TOD,&t);

    t.year -= 1900;

    tod[0] |= 0x80;      /* Stop write register */

    setTod(7,t.year);

    setTod(6,t.month);

    setTod(5,t.day);

    setTod(4,1);        /* I don't know which day of week is */

    setTod(3,t.hour);

    setTod(2,t.minute);

    setTod(1,t.second);

    tod[0] &= 0x3f;      /* Write these parameters */

}

int     checkRealTime()

{

    rtems_time_of_day   t;

    int         d;

    tod[0] |= 0x40;      /* Stop read register */

    rtems_clock_get(RTEMS_CLOCK_GET_TOD,&t);

    if((t.year != 1900+getTod(7,0xff))

       || (t.month != getTod(6,0x1f))

       || (t.day != getTod(5,0x3f)))

        d = 9999;

    else

        d = (t.hour-getTod(3,0x3f))*3600

            + (t.minute-getTod(3,0x7f))*60

                + (t.second - getTod(1,0x7f));

    tod[1] &= 0x3f;

    return d;

}