| | 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); |
projects / linux-2.6-block.git / blame_incremental