/*
 * (C) Copyright 2002
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <config.h>
#include <ppcboot.h>

#include "sconsole.h"

void		(* sconsole_putc) 	(char		c) 	= 0;
void		(* sconsole_puts) 	(const char *	c) 	= 0;
int		(* sconsole_getc) 	(void)			= 0;
int		(* sconsole_tstc) 	(void)			= 0;
void		(* sconsole_setbrg) 	(unsigned long 	dummy,
					 int 		baud)	= 0;

void serial_init (
  unsigned long 	dummy,
  int 			baudrate)
{
  sconsole_buffer_t * 	sb = SCONSOLE_BUFFER;
  
  sb->pos = 0;
  sb->size = 0;
  sb->baud = baudrate;
  sb->max_size = CFG_SCONSOLE_SIZE - sizeof(sconsole_buffer_t);
}

void serial_putc (
  char 			c)
{
  if (sconsole_putc)
  {
    (*sconsole_putc)(c);
  }
  else
  {
    sconsole_buffer_t * sb = SCONSOLE_BUFFER;
  
    if (c)
    {
      sb->data[sb->pos++] = c;
      if (sb->pos == sb->max_size)
      {
        sb->pos = 0;
      }
      if (sb->size < sb->max_size)
      {
        sb->size++;
      }
    }
  }
}

void serial_puts (
  const char *		s)
{
  if (sconsole_puts)
  {
    (*sconsole_puts)(s);
  }
  else
  {
    sconsole_buffer_t * sb = SCONSOLE_BUFFER;

    while (*s)
    {
      sb->data[sb->pos++] = *s++;
      if (sb->pos == sb->max_size)
      {
        sb->pos = 0;
      }
      if (sb->size < sb->max_size)
      {
        sb->size++;
      }
    }
  }
}

int serial_getc (void)
{
  if (sconsole_getc)
  {
    return (*sconsole_getc)();
  }
  else
  {
    return 0;
  }
}

int serial_tstc (void)
{
  if (sconsole_tstc)
  {
    return (*sconsole_tstc)();
  }
  else
  {
    return 0;
  }
}

void serial_setbrg (
  unsigned long 	dummy,
  int 			baudrate)
{
  if (sconsole_setbrg)
  {
    (*sconsole_setbrg)(dummy, baudrate);
  }
  else
  {
    sconsole_buffer_t * sb = SCONSOLE_BUFFER;
    
    sb->baud = baudrate;
  }
}

int sconsole_get_baudrate (void)
{
  sconsole_buffer_t * 	sb = SCONSOLE_BUFFER;
  
  return sb->baud;
}

void sconsole_flush (void)
{
  if (sconsole_putc)
  {
    sconsole_buffer_t * sb = SCONSOLE_BUFFER;
    unsigned int	end = sb->pos < sb->size ?
    			      sb->pos + sb->max_size - sb->size :
			      sb->pos - sb->size;
  
    while (sb->size)
    {
      (*sconsole_putc)(sb->data[end++]);
      if (end == sb->max_size)
      {
        end = 0;
      }
      sb->size--;
    }
  }
}
