arch/mips/mips-boards/generic/display.c

   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  * Display routines for display messages in MIPS boards ascii display.
  19  */
  20
  21 #include <linux/compiler.h>
  22 #include <asm/io.h>
  23 #include <asm/mips-boards/generic.h>
  24
  25 void mips_display_message(const char *str)
  26 {
  27         static volatile unsigned int *display = NULL;
  28         int i;
  29
  30         if (unlikely(display == NULL))
  31                 display = (volatile unsigned int *)ioremap(ASCII_DISPLAY_POS_BASE, 16*sizeof(int));
  32
  33         for (i = 0; i <= 14; i=i+2) {
  34                  if (*str)
  35                          display[i] = *str++;
  36                  else
  37                          display[i] = ' ';
  38         }
  39 }