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/*

 *  This file contains the TTY driver for the serial ports on the DMV152.

 *  The serial ports use a Zilog Z8530.

 *

 *  NOTE: This driver uses the termios pseudo driver.

 *        This driver is polled only.

 *

 *  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.

 *

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

 */

#include <bsp.h>

#include <rtems/libio.h>

#include <stdlib.h>

#include <assert.h>

/*

 *  console_outbyte_polled

 *

 *  This routine transmits a character using polling.

 */

void console_outbyte_polled(

  int  port,

  char ch

)

{

  rtems_unsigned32 control;

  rtems_unsigned32 data;

  rtems_unsigned8  rr_0;

  if ( port == 0 ) {

    control = CONSOLE_CONTROL_A;

    data    = CONSOLE_DATA_A;

  } else {

    control = CONSOLE_CONTROL_B;

    data    = CONSOLE_DATA_B;

  }

  for ( ; ; ) {

    Z8x30_READ_CONTROL( control, RR_0, rr_0 );

    if ( (rr_0 & RR_0_TX_BUFFER_EMPTY) != 0 )

      break;

  }

  Z8x30_WRITE_DATA( control, ch );

}

/*

 *  console_inbyte_nonblocking

 *

 *  This routine polls for a character.

 */

int console_inbyte_nonblocking(int port)

{

  rtems_unsigned32 control;

  rtems_unsigned32 data;

  rtems_unsigned8  rr_0;

  char             ch;

  if ( port == 0 ) {

    control = CONSOLE_CONTROL_A;

    data    = CONSOLE_DATA_A;

  } else {

    control = CONSOLE_CONTROL_B;

    data    = CONSOLE_DATA_B;

  }

  Z8x30_READ_CONTROL( control, RR_0, rr_0 );

  if ( !(rr_0 & RR_0_RX_DATA_AVAILABLE) )

    return -1;

  Z8x30_READ_DATA( data, ch );

  return (int) ch;

}

/*

 *  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;

  /* should disable interrupts here */

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

      console_outbyte_polled( 0, *s );

    console_outbyte_polled( 0, '\r' );

    console_outbyte_polled( 0, '\n' );

  /* should enable interrupts here */

}

/*

 *  Console Termios Support Entry Points

 *

 */

int console_write_support (int minor, const char *buf, int len)

{

  int nwrite = 0;

  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_device_minor_number  console_minor;

  rtems_termios_initialize();

  /*

   *  Register Device Names

   */

#if (USE_CHANNEL_A == 1)

  console_minor = 0;

#elif (USE_CHANNEL_B == 1)

  console_minor = 1;

#else

#error "DMV152 Console Driver -- no console port configured!!!"

#endif

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

  if (status != RTEMS_SUCCESSFUL)

    rtems_fatal_error_occurred(status);

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

  if (status != RTEMS_SUCCESSFUL)

    rtems_fatal_error_occurred(status);

  status = rtems_io_register_name( "/dev/console_b", major, 1 );

  if (status != RTEMS_SUCCESSFUL)

    rtems_fatal_error_occurred(status);

  /*

   *  Initialize Hardware

   */

  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);

}