/* * Carsten Langgaard, carstenl@mips.com * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved. * * ######################################################################## * *  This program is free software; you can distribute it and/or modify it *  under the terms of the GNU General Public License (Version 2) as *  published by the Free Software Foundation. * *  This program is distributed in the hope it will be useful, but WITHOUT *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License *  for more details. * *  You should have received a copy of the GNU General Public License along *  with this program; if not, write to the Free Software Foundation, Inc., *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA. * * ######################################################################## * * Putting things on the screen/serial line using YAMONs facilities. * */#include <linux/config.h>#include <linux/init.h>#include <linux/kernel.h>#include <linux/serialP.h>#include <linux/serial_reg.h>#include <asm/system.h>#include <asm/io.h>#include <asm/serial.h>#ifdef CONFIG_MIPS_ATLAS /*  * Atlas registers are memory mapped on 64-bit aligned boundaries and  * only word access are allowed. * When reading the UART 8 bit registers only the LSB are valid. */unsigned int atlas_serial_in(struct async_struct *info, int offset){	return (*(volatile unsigned int *)(info->port + mips_io_port_base + offset*8) & 0xff);}void atlas_serial_out(struct async_struct *info, int offset, int value){	*(volatile unsigned int *)(info->port + mips_io_port_base + offset*8) = value;}#define serial_in  atlas_serial_in#define serial_out atlas_serial_out#elsestatic unsigned int serial_in(struct async_struct *info, int offset){	return inb(info->port + offset);}static void serial_out(struct async_struct *info, int offset,				int value){	outb(value, info->port + offset);}#endifstatic struct serial_state rs_table[] = {	SERIAL_PORT_DFNS	/* Defined in serial.h */};/* * Hooks to fake "prom" console I/O before devices  * are fully initialized.  */static struct async_struct prom_port_info = {0};void __init setup_prom_printf(int tty_no) {	struct serial_state *ser = &rs_table[tty_no];	prom_port_info.state = ser;	prom_port_info.magic = SERIAL_MAGIC;	prom_port_info.port = ser->port;	prom_port_info.flags = ser->flags;	/* No setup of UART - assume YAMON left in sane state */}int putPromChar(char c){        if (!prom_port_info.state) { 	/* need to init device first */		return 0;	}	while ((serial_in(&prom_port_info, UART_LSR) & UART_LSR_THRE) == 0)		;	serial_out(&prom_port_info, UART_TX, c);	return 1;}char getPromChar(void){	if (!prom_port_info.state) { 	/* need to init device first */		return 0;	}	while (!(serial_in(&prom_port_info, UART_LSR) & 1))		;	return(serial_in(&prom_port_info, UART_RX));}static char buf[1024];void __init prom_printf(char *fmt, ...){	va_list args;	int l;	char *p, *buf_end;	long flags;	int putPromChar(char);	/* Low level, brute force, not SMP safe... */	save_and_cli(flags);	va_start(args, fmt);	l = vsprintf(buf, fmt, args); /* hopefully i < sizeof(buf) */	va_end(args);	buf_end = buf + l;	for (p = buf; p < buf_end; p++) {		/* Crude cr/nl handling is better than none */		if(*p == '\n')putPromChar('\r');		putPromChar(*p);	}	restore_flags(flags);}