0d456bad36
The Avnet LX60/LX110/LX200 board is an FPGA board that can be configured with an Xtensa processor and an OpenCores Ethernet device. Signed-off-by: Chris Zankel <chris@zankel.net> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
76 lines
1.6 KiB
C
76 lines
1.6 KiB
C
/*
|
|
* Driver for the LCD display on the Tensilica LX60 Board.
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 2001, 2006 Tensilica Inc.
|
|
*/
|
|
|
|
/*
|
|
*
|
|
* FIXME: this code is from the examples from the LX60 user guide.
|
|
*
|
|
* The lcd_pause function does busy waiting, which is probably not
|
|
* great. Maybe the code could be changed to use kernel timers, or
|
|
* change the hardware to not need to wait.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <platform/hardware.h>
|
|
#include <platform/lcd.h>
|
|
#include <linux/delay.h>
|
|
|
|
#define LCD_PAUSE_ITERATIONS 4000
|
|
#define LCD_CLEAR 0x1
|
|
#define LCD_DISPLAY_ON 0xc
|
|
|
|
/* 8bit and 2 lines display */
|
|
#define LCD_DISPLAY_MODE8BIT 0x38
|
|
#define LCD_DISPLAY_POS 0x80
|
|
#define LCD_SHIFT_LEFT 0x18
|
|
#define LCD_SHIFT_RIGHT 0x1c
|
|
|
|
static int __init lcd_init(void)
|
|
{
|
|
*LCD_INSTR_ADDR = LCD_DISPLAY_MODE8BIT;
|
|
mdelay(5);
|
|
*LCD_INSTR_ADDR = LCD_DISPLAY_MODE8BIT;
|
|
udelay(200);
|
|
*LCD_INSTR_ADDR = LCD_DISPLAY_MODE8BIT;
|
|
udelay(50);
|
|
*LCD_INSTR_ADDR = LCD_DISPLAY_ON;
|
|
udelay(50);
|
|
*LCD_INSTR_ADDR = LCD_CLEAR;
|
|
mdelay(10);
|
|
lcd_disp_at_pos("XTENSA LINUX", 0);
|
|
return 0;
|
|
}
|
|
|
|
void lcd_disp_at_pos(char *str, unsigned char pos)
|
|
{
|
|
*LCD_INSTR_ADDR = LCD_DISPLAY_POS | pos;
|
|
udelay(100);
|
|
while (*str != 0) {
|
|
*LCD_DATA_ADDR = *str;
|
|
udelay(200);
|
|
str++;
|
|
}
|
|
}
|
|
|
|
void lcd_shiftleft(void)
|
|
{
|
|
*LCD_INSTR_ADDR = LCD_SHIFT_LEFT;
|
|
udelay(50);
|
|
}
|
|
|
|
void lcd_shiftright(void)
|
|
{
|
|
*LCD_INSTR_ADDR = LCD_SHIFT_RIGHT;
|
|
udelay(50);
|
|
}
|
|
|
|
arch_initcall(lcd_init);
|