Subversion Repositories openrisc

/*

 *  This file contains a typical set of register access routines which may be

 *  used with the mc68681 chip if accesses to the chip are as follows:

 *

 *    + registers are accessed as bytes

 *    + registers are only byte-aligned (no address gaps)

 *

 *  COPYRIGHT (c) 1989-1997.

 *  On-Line Applications Research Corporation (OAR).

 *  Copyright assigned to U.S. Government, 1994.

 *

 *  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.

 *

 *  $Id: mc68681_reg.c,v 1.2 2001-09-27 12:01:42 chris Exp $

 */

#include <rtems.h>

#ifndef _MC68681_MULTIPLIER

#define _MC68681_MULTIPLIER 1

#define _MC68681_NAME(_X) _X

#define _MC68681_TYPE unsigned8

#endif

#define CALCULATE_REGISTER_ADDRESS( _base, _reg ) \

  (_MC68681_TYPE *)((_base) + ((_reg) * _MC68681_MULTIPLIER ))

/*

 *  MC68681 Get Register Routine

 */

unsigned8 _MC68681_NAME(mc68681_get_register)(

  unsigned32  ulCtrlPort,

  unsigned8   ucRegNum

)

{

  _MC68681_TYPE *port;

  port = CALCULATE_REGISTER_ADDRESS( ulCtrlPort, ucRegNum );

  return *port;

}

/*

 *  MC68681 Set Register Routine

 */

void  _MC68681_NAME(mc68681_set_register)(

  unsigned32  ulCtrlPort,

  unsigned8   ucRegNum,

  unsigned8   ucData

)

{

  _MC68681_TYPE *port;

  port = CALCULATE_REGISTER_ADDRESS( ulCtrlPort, ucRegNum );

  *port = ucData;

}