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/*

 *  This file contains the MVME136 console IO package.

 *

 *  COPYRIGHT (c) 1989-1999.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  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.

 *

 *  console.c,v 1.10 1999/11/17 17:51:00 joel Exp

 */

#define M136_INIT

#include <bsp.h>

#include <rtems/libio.h>

/*  console_initialize

 *

 *  This routine initializes the console IO driver.

 *

 *  Input parameters: NONE

 *

 *  Output parameters:  NONE

 *

 *  Return values:

 */

rtems_device_driver console_initialize(

  rtems_device_major_number  major,

  rtems_device_minor_number  minor,

  void                      *arg

)

{

  rtems_status_code status;

  _Write_m681 = ( struct w_m681_info * ) M681ADDR;

  _Read_m681 = ( struct r_m681_info * ) M681ADDR;

  status = rtems_io_register_name(

    "/dev/console",

    major,

    (rtems_device_minor_number) 0

  );

  if (status != RTEMS_SUCCESSFUL)

    rtems_fatal_error_occurred(status);

  return RTEMS_SUCCESSFUL;

}

/*  is_character_ready

 *

 *  This routine returns TRUE if a character is available.

 *

 *  Input parameters: NONE

 *

 *  Output parameters:  NONE

 *

 *  Return values:

 */

rtems_boolean is_character_ready(

  char *ch

)

{

  if ( !(_Read_m681->srb & RXRDYB) )

    return(FALSE);

  *ch = _Read_m681->rbb;

  return(TRUE);

}

/*  inbyte

 *

 *  This routine reads a character from the UART.

 *

 *  Input parameters: NONE

 *

 *  Output parameters:  NONE

 *

 *  Return values:

 *    character read from UART

 */

char inbyte( void )

{

  while ( !(_Read_m681->srb & RXRDYB) );

  return _Read_m681->rbb;

}

/*  outbyte

 *

 *  This routine transmits a character out the M68681.  It supports

 *  XON/XOFF flow control.

 *

 *  Input parameters:

 *    ch  - character to be transmitted

 *

 *  Output parameters:  NONE

 */

void outbyte(

  char ch

)

{

  while ( ! (_Read_m681->srb & TXRDYB) ) ;

  while ( _Read_m681->srb & RXRDYB )        /* must be an XOFF */

    if ( _Read_m681->rbb == XOFF )

      do {

        while ( ! (_Read_m681->srb & RXRDYB) ) ;

      } while ( _Read_m681->rbb != XON );

  _Write_m681->tbb = ch;

  if ( ch == '\n' )

    outbyte( CR );

}

/*

 *  Open entry point

 */

rtems_device_driver console_open(

  rtems_device_major_number major,

  rtems_device_minor_number minor,

  void                    * arg

)

{

  return RTEMS_SUCCESSFUL;

}

/*

 *  Close entry point

 */

rtems_device_driver console_close(

  rtems_device_major_number major,

  rtems_device_minor_number minor,

  void                    * arg

)

{

  return RTEMS_SUCCESSFUL;

}

/*

 * read bytes from the serial port. We only have stdin.

 */

rtems_device_driver console_read(

  rtems_device_major_number major,

  rtems_device_minor_number minor,

  void                    * arg

)

{

  rtems_libio_rw_args_t *rw_args;

  char *buffer;

  int maximum;

  int count = 0;

  rw_args = (rtems_libio_rw_args_t *) arg;

  buffer = rw_args->buffer;

  maximum = rw_args->count;

  for (count = 0; count < maximum; count++) {

    buffer[ count ] = inbyte();

    if (buffer[ count ] == '\n' || buffer[ count ] == '\r') {

      buffer[ count++ ]  = '\n';

      break;

    }

  }

  rw_args->bytes_moved = count;

  return (count >= 0) ? RTEMS_SUCCESSFUL : RTEMS_UNSATISFIED;

}

/*

 * write bytes to the serial port. Stdout and stderr are the same.

 */

rtems_device_driver console_write(

  rtems_device_major_number major,

  rtems_device_minor_number minor,

  void                    * arg

)

{

  int count;

  int maximum;

  rtems_libio_rw_args_t *rw_args;

  char *buffer;

  rw_args = (rtems_libio_rw_args_t *) arg;

  buffer = rw_args->buffer;

  maximum = rw_args->count;

  for (count = 0; count < maximum; count++) {

    if ( buffer[ count ] == '\n') {

      outbyte('\r');

    }

    outbyte( buffer[ count ] );

  }

  rw_args->bytes_moved = maximum;

  return 0;

}

/*

 *  IO Control entry point

 */

rtems_device_driver console_control(

  rtems_device_major_number major,

  rtems_device_minor_number minor,

  void                    * arg

)

{

  return RTEMS_SUCCESSFUL;

}