cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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lcd.c (2139B)

      1/*
      2 * Driver for the LCD display on the Tensilica XTFPGA board family.
      3 * http://www.mytechcorp.com/cfdata/productFile/File1/MOC-16216B-B-A0A04.pdf
      4 *
      5 * This file is subject to the terms and conditions of the GNU General Public
      6 * License.  See the file "COPYING" in the main directory of this archive
      7 * for more details.
      8 *
      9 * Copyright (C) 2001, 2006 Tensilica Inc.
     10 * Copyright (C) 2015 Cadence Design Systems Inc.
     11 */
     12
     13#include <linux/delay.h>
     14#include <linux/init.h>
     15#include <linux/io.h>
     16
     17#include <platform/hardware.h>
     18#include <platform/lcd.h>
     19
     20/* LCD instruction and data addresses. */
     21#define LCD_INSTR_ADDR		((char *)IOADDR(CONFIG_XTFPGA_LCD_BASE_ADDR))
     22#define LCD_DATA_ADDR		(LCD_INSTR_ADDR + 4)
     23
     24#define LCD_CLEAR		0x1
     25#define LCD_DISPLAY_ON		0xc
     26
     27/* 8bit and 2 lines display */
     28#define LCD_DISPLAY_MODE8BIT	0x38
     29#define LCD_DISPLAY_MODE4BIT	0x28
     30#define LCD_DISPLAY_POS		0x80
     31#define LCD_SHIFT_LEFT		0x18
     32#define LCD_SHIFT_RIGHT		0x1c
     33
     34static void lcd_put_byte(u8 *addr, u8 data)
     35{
     36#ifdef CONFIG_XTFPGA_LCD_8BIT_ACCESS
     37	WRITE_ONCE(*addr, data);
     38#else
     39	WRITE_ONCE(*addr, data & 0xf0);
     40	WRITE_ONCE(*addr, (data << 4) & 0xf0);
     41#endif
     42}
     43
     44static int __init lcd_init(void)
     45{
     46	WRITE_ONCE(*LCD_INSTR_ADDR, LCD_DISPLAY_MODE8BIT);
     47	mdelay(5);
     48	WRITE_ONCE(*LCD_INSTR_ADDR, LCD_DISPLAY_MODE8BIT);
     49	udelay(200);
     50	WRITE_ONCE(*LCD_INSTR_ADDR, LCD_DISPLAY_MODE8BIT);
     51	udelay(50);
     52#ifndef CONFIG_XTFPGA_LCD_8BIT_ACCESS
     53	WRITE_ONCE(*LCD_INSTR_ADDR, LCD_DISPLAY_MODE4BIT);
     54	udelay(50);
     55	lcd_put_byte(LCD_INSTR_ADDR, LCD_DISPLAY_MODE4BIT);
     56	udelay(50);
     57#endif
     58	lcd_put_byte(LCD_INSTR_ADDR, LCD_DISPLAY_ON);
     59	udelay(50);
     60	lcd_put_byte(LCD_INSTR_ADDR, LCD_CLEAR);
     61	mdelay(10);
     62	lcd_disp_at_pos("XTENSA LINUX", 0);
     63	return 0;
     64}
     65
     66void lcd_disp_at_pos(char *str, unsigned char pos)
     67{
     68	lcd_put_byte(LCD_INSTR_ADDR, LCD_DISPLAY_POS | pos);
     69	udelay(100);
     70	while (*str != 0) {
     71		lcd_put_byte(LCD_DATA_ADDR, *str);
     72		udelay(200);
     73		str++;
     74	}
     75}
     76
     77void lcd_shiftleft(void)
     78{
     79	lcd_put_byte(LCD_INSTR_ADDR, LCD_SHIFT_LEFT);
     80	udelay(50);
     81}
     82
     83void lcd_shiftright(void)
     84{
     85	lcd_put_byte(LCD_INSTR_ADDR, LCD_SHIFT_RIGHT);
     86	udelay(50);
     87}
     88
     89arch_initcall(lcd_init);