LXR linux/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 <linux/timer.h>
  23#include <asm/io.h>
  24#include <asm/mips-boards/generic.h>
  25
  26extern const char display_string[];
  27static unsigned int display_count;
  28static unsigned int max_display_count;
  29
  30void mips_display_message(const char *str)
  31{
  32        static unsigned int __iomem *display = NULL;
  33        int i;
  34
  35        if (unlikely(display == NULL))
  36                display = ioremap(ASCII_DISPLAY_POS_BASE, 16*sizeof(int));
  37
  38        for (i = 0; i <= 14; i=i+2) {
  39                 if (*str)
  40                         writel(*str++, display + i);
  41                 else
  42                         writel(' ', display + i);
  43        }
  44}
  45
  46static void scroll_display_message(unsigned long data);
  47static DEFINE_TIMER(mips_scroll_timer, scroll_display_message, HZ, 0);
  48
  49static void scroll_display_message(unsigned long data)
  50{
  51        mips_display_message(&display_string[display_count++]);
  52        if (display_count == max_display_count)
  53                display_count = 0;
  54
  55        mod_timer(&mips_scroll_timer, jiffies + HZ);
  56}
  57
  58void mips_scroll_message(void)
  59{
  60        del_timer_sync(&mips_scroll_timer);
  61        max_display_count = strlen(display_string) + 1 - 8;
  62        mod_timer(&mips_scroll_timer, jiffies + 1);
  63}
  64