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Linux/arch/xtensa/platforms/xtfpga/lcd.c

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  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 
 34 static 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 
 44 static 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 
 66 void 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 
 77 void lcd_shiftleft(void)
 78 {
 79         lcd_put_byte(LCD_INSTR_ADDR, LCD_SHIFT_LEFT);
 80         udelay(50);
 81 }
 82 
 83 void lcd_shiftright(void)
 84 {
 85         lcd_put_byte(LCD_INSTR_ADDR, LCD_SHIFT_RIGHT);
 86         udelay(50);
 87 }
 88 
 89 arch_initcall(lcd_init);
 90 

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