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
serial_in(int offset)29 static inline unsigned int serial_in(int offset)
30 {
31 return inb(PORT(offset));
32 }
33
serial_out(int offset,int value)34 static inline void serial_out(int offset, int value)
35 {
36 outb(value, PORT(offset));
37 }
38
prom_putchar(char c)39 int 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