1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Display routines for display messages in MIPS boards ascii display. 7 * 8 * Copyright (C) 1999,2000,2012 MIPS Technologies, Inc. 9 * All rights reserved. 10 * Authors: Carsten Langgaard <carstenl@mips.com> 11 * Steven J. Hill <sjhill@mips.com> 12 */ 13 #include <linux/compiler.h> 14 #include <linux/timer.h> 15 #include <linux/io.h> 16 17 #include <asm/mips-boards/generic.h> 18 19 extern const char display_string[]; 20 static unsigned int display_count; 21 static unsigned int max_display_count; 22 mips_display_message(const char * str)23void mips_display_message(const char *str) 24 { 25 static unsigned int __iomem *display = NULL; 26 int i; 27 28 if (unlikely(display == NULL)) 29 display = ioremap(ASCII_DISPLAY_POS_BASE, 16*sizeof(int)); 30 31 for (i = 0; i <= 14; i += 2) { 32 if (*str) 33 __raw_writel(*str++, display + i); 34 else 35 __raw_writel(' ', display + i); 36 } 37 } 38 39 static void scroll_display_message(struct timer_list *unused); 40 static DEFINE_TIMER(mips_scroll_timer, scroll_display_message); 41 scroll_display_message(struct timer_list * unused)42static void scroll_display_message(struct timer_list *unused) 43 { 44 mips_display_message(&display_string[display_count++]); 45 if (display_count == max_display_count) 46 display_count = 0; 47 48 mod_timer(&mips_scroll_timer, jiffies + HZ); 49 } 50 mips_scroll_message(void)51void mips_scroll_message(void) 52 { 53 del_timer_sync(&mips_scroll_timer); 54 max_display_count = strlen(display_string) + 1 - 8; 55 mod_timer(&mips_scroll_timer, jiffies + 1); 56 } 57
