mirror of https://gitee.com/openkylin/linux.git
77 lines
1.6 KiB
C
77 lines
1.6 KiB
C
/*
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* Driver for the LCD display on the Tensilica LX60 Board.
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*
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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) 2001, 2006 Tensilica Inc.
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*/
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/*
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*
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* FIXME: this code is from the examples from the LX60 user guide.
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*
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* The lcd_pause function does busy waiting, which is probably not
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* great. Maybe the code could be changed to use kernel timers, or
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* change the hardware to not need to wait.
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*/
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#include <linux/init.h>
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#include <linux/io.h>
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#include <platform/hardware.h>
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#include <platform/lcd.h>
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#include <linux/delay.h>
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#define LCD_PAUSE_ITERATIONS 4000
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#define LCD_CLEAR 0x1
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#define LCD_DISPLAY_ON 0xc
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/* 8bit and 2 lines display */
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#define LCD_DISPLAY_MODE8BIT 0x38
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#define LCD_DISPLAY_POS 0x80
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#define LCD_SHIFT_LEFT 0x18
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#define LCD_SHIFT_RIGHT 0x1c
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static int __init lcd_init(void)
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{
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*LCD_INSTR_ADDR = LCD_DISPLAY_MODE8BIT;
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mdelay(5);
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*LCD_INSTR_ADDR = LCD_DISPLAY_MODE8BIT;
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udelay(200);
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*LCD_INSTR_ADDR = LCD_DISPLAY_MODE8BIT;
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udelay(50);
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*LCD_INSTR_ADDR = LCD_DISPLAY_ON;
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udelay(50);
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*LCD_INSTR_ADDR = LCD_CLEAR;
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mdelay(10);
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lcd_disp_at_pos("XTENSA LINUX", 0);
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return 0;
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}
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void lcd_disp_at_pos(char *str, unsigned char pos)
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{
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*LCD_INSTR_ADDR = LCD_DISPLAY_POS | pos;
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udelay(100);
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while (*str != 0) {
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*LCD_DATA_ADDR = *str;
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udelay(200);
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str++;
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}
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}
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void lcd_shiftleft(void)
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{
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*LCD_INSTR_ADDR = LCD_SHIFT_LEFT;
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udelay(50);
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}
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void lcd_shiftright(void)
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{
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*LCD_INSTR_ADDR = LCD_SHIFT_RIGHT;
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udelay(50);
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}
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arch_initcall(lcd_init);
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