1/*
2 *  This program is free software; you can distribute it and/or modify it
3 *  under the terms of the GNU General Public License (Version 2) as
4 *  published by the Free Software Foundation.
5 *
6 *  This program is distributed in the hope it will be useful, but WITHOUT
7 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
8 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
9 *  for more details.
10 *
11 *  You should have received a copy of the GNU General Public License along
12 *  with this program; if not, write to the Free Software Foundation, Inc.,
13 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
14 *
15 * Carsten Langgaard, carstenl@mips.com
16 * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
17 * Copyright (C) 2007 MIPS Technologies, Inc.
18 *   written by Ralf Baechle
19 */
20#include <linux/init.h>
21#include <linux/serial_reg.h>
22#include <asm/io.h>
23
24static inline unsigned int serial_in(int offset)
25{
26	return inb(0x3f8 + offset);
27}
28
29static inline void serial_out(int offset, int value)
30{
31	outb(value, 0x3f8 + offset);
32}
33
34void __init prom_putchar(char c)
35{
36	while ((serial_in(UART_LSR) & UART_LSR_THRE) == 0)
37		;
38
39	serial_out(UART_TX, c);
40}
41