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}