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 */ 19#include <linux/console.h> 20#include <linux/init.h> 21#include <linux/serial_reg.h> 22#include <asm/io.h> 23 24 25#define SEAD_UART1_REGS_BASE 0xbf000800 /* ttyS1 = RS232 port */ 26#define SEAD_UART0_REGS_BASE 0xbf000900 /* ttyS0 = USB port */ 27 28#define PORT(base_addr, offset) ((unsigned int __iomem *)(base_addr+(offset)*4)) 29 30static inline unsigned int serial_in(int offset, unsigned int base_addr) 31{ 32 return __raw_readl(PORT(base_addr, offset)) & 0xff; 33} 34 35static inline void serial_out(int offset, int value, unsigned int base_addr) 36{ 37 __raw_writel(value, PORT(base_addr, offset)); 38} 39 40int prom_putchar(char c, char port) 41{ 42 unsigned int base_addr; 43 44 base_addr = port ? SEAD_UART1_REGS_BASE : SEAD_UART0_REGS_BASE; 45 46 while ((serial_in(UART_LSR, base_addr) & UART_LSR_THRE) == 0) 47 ; 48 49 serial_out(UART_TX, c, base_addr); 50 51 return 1; 52} 53