Linux 4.1.18
[linux/fpc-iii.git] / arch / mips / mti-malta / malta-display.c
blobd4f807191ecd74694075ba3ca2748ff0b80bcbb1
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.
6 * Display routines for display messages in MIPS boards ascii display.
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>
13 #include <linux/compiler.h>
14 #include <linux/timer.h>
15 #include <linux/io.h>
17 #include <asm/mips-boards/generic.h>
19 extern const char display_string[];
20 static unsigned int display_count;
21 static unsigned int max_display_count;
23 void mips_display_message(const char *str)
25 static unsigned int __iomem *display = NULL;
26 int i;
28 if (unlikely(display == NULL))
29 display = ioremap(ASCII_DISPLAY_POS_BASE, 16*sizeof(int));
31 for (i = 0; i <= 14; i += 2) {
32 if (*str)
33 __raw_writel(*str++, display + i);
34 else
35 __raw_writel(' ', display + i);
39 static void scroll_display_message(unsigned long data);
40 static DEFINE_TIMER(mips_scroll_timer, scroll_display_message, HZ, 0);
42 static void scroll_display_message(unsigned long data)
44 mips_display_message(&display_string[display_count++]);
45 if (display_count == max_display_count)
46 display_count = 0;
48 mod_timer(&mips_scroll_timer, jiffies + HZ);
51 void mips_scroll_message(void)
53 del_timer_sync(&mips_scroll_timer);
54 max_display_count = strlen(display_string) + 1 - 8;
55 mod_timer(&mips_scroll_timer, jiffies + 1);