From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/xtensa/platforms/xtfpga/lcd.c | 89 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 89 insertions(+) create mode 100644 arch/xtensa/platforms/xtfpga/lcd.c (limited to 'arch/xtensa/platforms/xtfpga/lcd.c') diff --git a/arch/xtensa/platforms/xtfpga/lcd.c b/arch/xtensa/platforms/xtfpga/lcd.c new file mode 100644 index 000000000..2f7eb66c2 --- /dev/null +++ b/arch/xtensa/platforms/xtfpga/lcd.c @@ -0,0 +1,89 @@ +/* + * Driver for the LCD display on the Tensilica XTFPGA board family. + * http://www.mytechcorp.com/cfdata/productFile/File1/MOC-16216B-B-A0A04.pdf + * + * 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. + * Copyright (C) 2015 Cadence Design Systems Inc. + */ + +#include +#include +#include + +#include +#include + +/* LCD instruction and data addresses. */ +#define LCD_INSTR_ADDR ((char *)IOADDR(CONFIG_XTFPGA_LCD_BASE_ADDR)) +#define LCD_DATA_ADDR (LCD_INSTR_ADDR + 4) + +#define LCD_CLEAR 0x1 +#define LCD_DISPLAY_ON 0xc + +/* 8bit and 2 lines display */ +#define LCD_DISPLAY_MODE8BIT 0x38 +#define LCD_DISPLAY_MODE4BIT 0x28 +#define LCD_DISPLAY_POS 0x80 +#define LCD_SHIFT_LEFT 0x18 +#define LCD_SHIFT_RIGHT 0x1c + +static void lcd_put_byte(u8 *addr, u8 data) +{ +#ifdef CONFIG_XTFPGA_LCD_8BIT_ACCESS + WRITE_ONCE(*addr, data); +#else + WRITE_ONCE(*addr, data & 0xf0); + WRITE_ONCE(*addr, (data << 4) & 0xf0); +#endif +} + +static int __init lcd_init(void) +{ + WRITE_ONCE(*LCD_INSTR_ADDR, LCD_DISPLAY_MODE8BIT); + mdelay(5); + WRITE_ONCE(*LCD_INSTR_ADDR, LCD_DISPLAY_MODE8BIT); + udelay(200); + WRITE_ONCE(*LCD_INSTR_ADDR, LCD_DISPLAY_MODE8BIT); + udelay(50); +#ifndef CONFIG_XTFPGA_LCD_8BIT_ACCESS + WRITE_ONCE(*LCD_INSTR_ADDR, LCD_DISPLAY_MODE4BIT); + udelay(50); + lcd_put_byte(LCD_INSTR_ADDR, LCD_DISPLAY_MODE4BIT); + udelay(50); +#endif + lcd_put_byte(LCD_INSTR_ADDR, LCD_DISPLAY_ON); + udelay(50); + lcd_put_byte(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_put_byte(LCD_INSTR_ADDR, LCD_DISPLAY_POS | pos); + udelay(100); + while (*str != 0) { + lcd_put_byte(LCD_DATA_ADDR, *str); + udelay(200); + str++; + } +} + +void lcd_shiftleft(void) +{ + lcd_put_byte(LCD_INSTR_ADDR, LCD_SHIFT_LEFT); + udelay(50); +} + +void lcd_shiftright(void) +{ + lcd_put_byte(LCD_INSTR_ADDR, LCD_SHIFT_RIGHT); + udelay(50); +} + +arch_initcall(lcd_init); -- cgit v1.2.3