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}