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#include <asm/mips-boards/prom.h> 26 27extern const char display_string[]; 28static unsigned int display_count; 29static unsigned int max_display_count; 30 31void mips_display_message(const char *str) 32{ 33 static unsigned int __iomem *display = NULL; 34 int i; 35 36 if (unlikely(display == NULL)) 37 display = ioremap(ASCII_DISPLAY_POS_BASE, 16*sizeof(int)); 38 39 for (i = 0; i <= 14; i=i+2) { 40 if (*str) 41 __raw_writel(*str++, display + i); 42 else 43 __raw_writel(' ', display + i); 44 } 45} 46 47static void scroll_display_message(unsigned long data); 48static DEFINE_TIMER(mips_scroll_timer, scroll_display_message, HZ, 0); 49 50static void scroll_display_message(unsigned long data) 51{ 52 mips_display_message(&display_string[display_count++]); 53 if (display_count == max_display_count) 54 display_count = 0; 55 56 mod_timer(&mips_scroll_timer, jiffies + HZ); 57} 58 59void mips_scroll_message(void) 60{ 61 del_timer_sync(&mips_scroll_timer); 62 max_display_count = strlen(display_string) + 1 - 8; 63 mod_timer(&mips_scroll_timer, jiffies + 1); 64} 65