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/io.h>
22 #include <linux/serial_reg.h>
23
serial_in(int offset)24 static inline unsigned int serial_in(int offset)
25 {
26 return inb(0x3f8 + offset);
27 }
28
serial_out(int offset,int value)29 static inline void serial_out(int offset, int value)
30 {
31 outb(value, 0x3f8 + offset);
32 }
33
prom_putchar(char c)34 void __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