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