arch/mips/mipssim/sim_console.c

   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
  24 static inline unsigned int serial_in(int offset)
  25 {
  26         return inb(0x3f8 + offset);
  27 }
  28
  29 static inline void serial_out(int offset, int value)
  30 {
  31         outb(value, 0x3f8 + offset);
  32 }
  33
  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 }