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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Ralf Baechle79894c72007-05-16 17:54:08 +020022#include <linux/timer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <asm/io.h>
24#include <asm/mips-boards/generic.h>
Dmitri Vorobievc3dd3de2008-06-18 10:18:23 +030025#include <asm/mips-boards/prom.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
Ralf Baechle79894c72007-05-16 17:54:08 +020027extern const char display_string[];
28static unsigned int display_count;
29static unsigned int max_display_count;
30
Linus Torvalds1da177e2005-04-16 15:20:36 -070031void mips_display_message(const char *str)
32{
Ralf Baechlef1974652007-04-26 15:46:24 +010033 static unsigned int __iomem *display = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 int i;
35
36 if (unlikely(display == NULL))
Ralf Baechlef1974652007-04-26 15:46:24 +010037 display = ioremap(ASCII_DISPLAY_POS_BASE, 16*sizeof(int));
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39 for (i = 0; i <= 14; i=i+2) {
40 if (*str)
Chris Dearman6d2d4192007-12-06 15:35:54 +000041 __raw_writel(*str++, display + i);
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 else
Chris Dearman6d2d4192007-12-06 15:35:54 +000043 __raw_writel(' ', display + i);
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 }
45}
Ralf Baechle79894c72007-05-16 17:54:08 +020046
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}