LXR linux/arch/mips/mti-malta/malta-console.c

   1/*
   2 * Carsten Langgaard, carstenl@mips.com
   3 * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
   4 *
   5 *  This program is free software; you can distribute it and/or modify it
   6 *  under the terms of the GNU General Public License (Version 2) as
   7 *  published by the Free Software Foundation.
   8 *
   9 *  This program is distributed in the hope it will be useful, but WITHOUT
  10 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12 *  for more details.
  13 *
  14 *  You should have received a copy of the GNU General Public License along
  15 *  with this program; if not, write to the Free Software Foundation, Inc.,
  16 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  17 *
  18 * Putting things on the screen/serial line using YAMONs facilities.
  19 */
  20#include <linux/console.h>
  21#include <linux/init.h>
  22#include <linux/serial_reg.h>
  23#include <asm/io.h>
  24
  25
  26#define PORT(offset) (0x3f8 + (offset))
  27
  28
  29static inline unsigned int serial_in(int offset)
  30{
  31        return inb(PORT(offset));
  32}
  33
  34static inline void serial_out(int offset, int value)
  35{
  36        outb(value, PORT(offset));
  37}
  38
  39int prom_putchar(char c)
  40{
  41        while ((serial_in(UART_LSR) & UART_LSR_THRE) == 0)
  42                ;
  43
  44        serial_out(UART_TX, c);
  45
  46        return 1;
  47}
  48