78 lines
2.0 KiB
C
78 lines
2.0 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
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*/
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#include <linux/timer.h>
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#include <linux/io.h>
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#include <asm/mips-boards/generic.h>
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static unsigned int display_count;
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static unsigned int max_display_count;
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#define LCD_DISPLAY_POS_BASE 0x1f000400
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#define DISPLAY_LCDINSTRUCTION (0*2)
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#define DISPLAY_LCDDATA (1*2)
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#define DISPLAY_CPLDSTATUS (2*2)
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#define DISPLAY_CPLDDATA (3*2)
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#define LCD_SETDDRAM 0x80
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#define LCD_IR_BF 0x80
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const char display_string[] = " LINUX ON SEAD3 ";
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static void scroll_display_message(unsigned long data);
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static DEFINE_TIMER(mips_scroll_timer, scroll_display_message, HZ, 0);
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static void lcd_wait(unsigned int __iomem *display)
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{
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/* Wait for CPLD state machine to become idle. */
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do { } while (__raw_readl(display + DISPLAY_CPLDSTATUS) & 1);
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do {
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__raw_readl(display + DISPLAY_LCDINSTRUCTION);
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/* Wait for CPLD state machine to become idle. */
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do { } while (__raw_readl(display + DISPLAY_CPLDSTATUS) & 1);
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} while (__raw_readl(display + DISPLAY_CPLDDATA) & LCD_IR_BF);
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}
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void mips_display_message(const char *str)
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{
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static unsigned int __iomem *display;
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char ch;
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int i;
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if (unlikely(display == NULL))
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display = ioremap_nocache(LCD_DISPLAY_POS_BASE,
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(8 * sizeof(int)));
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for (i = 0; i < 16; i++) {
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if (*str)
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ch = *str++;
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else
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ch = ' ';
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lcd_wait(display);
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__raw_writel((LCD_SETDDRAM | i),
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(display + DISPLAY_LCDINSTRUCTION));
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lcd_wait(display);
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__raw_writel(ch, display + DISPLAY_LCDDATA);
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}
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}
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static void scroll_display_message(unsigned long data)
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{
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mips_display_message(&display_string[display_count++]);
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if (display_count == max_display_count)
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display_count = 0;
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mod_timer(&mips_scroll_timer, jiffies + HZ);
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}
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void mips_scroll_message(void)
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{
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del_timer_sync(&mips_scroll_timer);
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max_display_count = strlen(display_string) + 1 - 16;
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mod_timer(&mips_scroll_timer, jiffies + 1);
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}
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