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
19extern const char display_string[];
20static unsigned int display_count;
21static unsigned int max_display_count;
22
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
39static void scroll_display_message(unsigned long data);
40static DEFINE_TIMER(mips_scroll_timer, scroll_display_message, HZ, 0);
41
42static void scroll_display_message(unsigned long data)
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
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