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1da177e4 LT |
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> | |
79894c7b | 22 | #include <linux/timer.h> |
1da177e4 LT |
23 | #include <asm/io.h> |
24 | #include <asm/mips-boards/generic.h> | |
c3dd3de7 | 25 | #include <asm/mips-boards/prom.h> |
1da177e4 | 26 | |
79894c7b RB |
27 | extern const char display_string[]; |
28 | static unsigned int display_count; | |
29 | static unsigned int max_display_count; | |
30 | ||
1da177e4 LT |
31 | void mips_display_message(const char *str) |
32 | { | |
f1974653 | 33 | static unsigned int __iomem *display = NULL; |
1da177e4 LT |
34 | int i; |
35 | ||
36 | if (unlikely(display == NULL)) | |
f1974653 | 37 | display = ioremap(ASCII_DISPLAY_POS_BASE, 16*sizeof(int)); |
1da177e4 LT |
38 | |
39 | for (i = 0; i <= 14; i=i+2) { | |
40 | if (*str) | |
6d2d419f | 41 | __raw_writel(*str++, display + i); |
1da177e4 | 42 | else |
6d2d419f | 43 | __raw_writel(' ', display + i); |
1da177e4 LT |
44 | } |
45 | } | |
79894c7b RB |
46 | |
47 | static void scroll_display_message(unsigned long data); | |
48 | static DEFINE_TIMER(mips_scroll_timer, scroll_display_message, HZ, 0); | |
49 | ||
50 | static 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 | ||
59 | void 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 | } |