blob: 94875991907bd4c3bfda8ac32b825a3513e7a4e8 [file] [log] [blame]
Steven J. Hill30700332012-05-30 21:02:49 +00001/*
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 * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
7 */
8#include <linux/timer.h>
9#include <linux/io.h>
10#include <asm/mips-boards/generic.h>
Steven J. Hill30700332012-05-30 21:02:49 +000011
12static unsigned int display_count;
13static unsigned int max_display_count;
14
15#define LCD_DISPLAY_POS_BASE 0x1f000400
16#define DISPLAY_LCDINSTRUCTION (0*2)
17#define DISPLAY_LCDDATA (1*2)
18#define DISPLAY_CPLDSTATUS (2*2)
19#define DISPLAY_CPLDDATA (3*2)
20#define LCD_SETDDRAM 0x80
21#define LCD_IR_BF 0x80
22
Ralf Baechle70342282013-01-22 12:59:30 +010023const char display_string[] = " LINUX ON SEAD3 ";
Steven J. Hill30700332012-05-30 21:02:49 +000024
25static void scroll_display_message(unsigned long data);
26static DEFINE_TIMER(mips_scroll_timer, scroll_display_message, HZ, 0);
27
28static void lcd_wait(unsigned int __iomem *display)
29{
30 /* Wait for CPLD state machine to become idle. */
31 do { } while (__raw_readl(display + DISPLAY_CPLDSTATUS) & 1);
32
33 do {
34 __raw_readl(display + DISPLAY_LCDINSTRUCTION);
35
36 /* Wait for CPLD state machine to become idle. */
37 do { } while (__raw_readl(display + DISPLAY_CPLDSTATUS) & 1);
38 } while (__raw_readl(display + DISPLAY_CPLDDATA) & LCD_IR_BF);
39}
40
41void mips_display_message(const char *str)
42{
43 static unsigned int __iomem *display;
44 char ch;
45 int i;
46
47 if (unlikely(display == NULL))
48 display = ioremap_nocache(LCD_DISPLAY_POS_BASE,
49 (8 * sizeof(int)));
50
51 for (i = 0; i < 16; i++) {
52 if (*str)
53 ch = *str++;
54 else
55 ch = ' ';
56 lcd_wait(display);
57 __raw_writel((LCD_SETDDRAM | i),
58 (display + DISPLAY_LCDINSTRUCTION));
59 lcd_wait(display);
60 __raw_writel(ch, display + DISPLAY_LCDDATA);
61 }
62}
63
64static void scroll_display_message(unsigned long data)
65{
66 mips_display_message(&display_string[display_count++]);
67 if (display_count == max_display_count)
68 display_count = 0;
69 mod_timer(&mips_scroll_timer, jiffies + HZ);
70}
71
72void mips_scroll_message(void)
73{
74 del_timer_sync(&mips_scroll_timer);
75 max_display_count = strlen(display_string) + 1 - 16;
76 mod_timer(&mips_scroll_timer, jiffies + 1);
77}