Subversion Repositories openrisc_2011-10-31

/*

 *  This file contains the hardware specific portions of the TTY driver

 *  for the serial ports on the erc32.

 *

 *  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: console.c,v 1.2 2001-09-27 12:01:02 chris Exp $

 */

#include <bsp.h>

#include <rtems/libio.h>

#include <stdlib.h>

#include <assert.h>

/* external prototypes for monitor interface routines */

void outbyte( char );

char inbyte( void );

/*

 *  console_outbyte_polled

 *

 *  This routine transmits a character using polling.

 */

void console_outbyte_polled(

  int  port,

  char ch

)

{

  outbyte( ch );

}

/*

 *  console_inbyte_nonblocking

 *

 *  This routine polls for a character.

 */

int console_inbyte_nonblocking(

  int port

)

{

  char c;

  c = inbyte();

  if (!c)

    return -1;

  return c;

}

/*

 *  DEBUG_puts

 *

 *  This should be safe in the event of an error.  It attempts to insure

 *  that no TX empty interrupts occur while it is doing polled IO.  Then

 *  it restores the state of that external interrupt.

 *

 *  Input parameters:

 *    string  - pointer to debug output string

 *

 *  Output parameters:  NONE

 *

 *  Return values:      NONE

 */

void DEBUG_puts(

  char *string

)

{

  char *s;

  /* XXX should disable interrupts around this if interrupt driven */

  for ( s = string ; *s ; s++ )

    console_outbyte_polled( 0, *s );

  console_outbyte_polled( 0, '\r' );

  console_outbyte_polled( 0, '\n' );

}

/*

 *  Console Termios Support Entry Points

 *

 */

int console_write_support (

  int minor,

  const char *bufarg,

  int len

)

{

  int nwrite = 0;

  const char *buf = bufarg;

  while (nwrite < len) {

    console_outbyte_polled( minor, *buf++ );

    nwrite++;

  }

  return nwrite;

}

/*

 *  Console Device Driver Entry Points

 *

 */

rtems_device_driver console_initialize(

  rtems_device_major_number  major,

  rtems_device_minor_number  minor,

  void                      *arg

)

{

  rtems_status_code status;

  rtems_termios_initialize();

  /*

   *  Register Device Names

   */

  status = rtems_io_register_name( "/dev/console", major, 0 );

  if (status != RTEMS_SUCCESSFUL)

    rtems_fatal_error_occurred(status);

  return RTEMS_SUCCESSFUL;

}

rtems_device_driver console_open(

  rtems_device_major_number major,

  rtems_device_minor_number minor,

  void                    * arg

)

{

  rtems_status_code sc;

  static const rtems_termios_callbacks pollCallbacks = {

    NULL,                        /* firstOpen */

    NULL,                        /* lastClose */

    console_inbyte_nonblocking,  /* pollRead */

    console_write_support,       /* write */

    NULL,                        /* setAttributes */

    NULL,                        /* stopRemoteTx */

    NULL,                        /* startRemoteTx */

  };

  assert( minor <= 1 );

  if ( minor > 2 )

    return RTEMS_INVALID_NUMBER;

  sc = rtems_termios_open (major, minor, arg, &pollCallbacks );

  return RTEMS_SUCCESSFUL;

}

rtems_device_driver console_close(

  rtems_device_major_number major,

  rtems_device_minor_number minor,

  void                    * arg

)

{

  return rtems_termios_close (arg);

}

rtems_device_driver console_read(

  rtems_device_major_number major,

  rtems_device_minor_number minor,

  void                    * arg

)

{

  return rtems_termios_read (arg);

}

rtems_device_driver console_write(

  rtems_device_major_number major,

  rtems_device_minor_number minor,

  void                    * arg

)

{

  return rtems_termios_write (arg);

}

rtems_device_driver console_control(

  rtems_device_major_number major,

  rtems_device_minor_number minor,

  void                    * arg

)

{

  return rtems_termios_ioctl (arg);

}