diff options
Diffstat (limited to 'board/amcc/taihu/lcd.c')
| -rw-r--r-- | board/amcc/taihu/lcd.c | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/board/amcc/taihu/lcd.c b/board/amcc/taihu/lcd.c new file mode 100644 index 0000000..3d042df --- /dev/null +++ b/board/amcc/taihu/lcd.c @@ -0,0 +1,257 @@ +/* + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <config.h> +#include <common.h> +#include <command.h> +#include <asm/io.h> +#include <asm/gpio.h> + +#define LCD_CMD_ADDR 0x50100002 +#define LCD_DATA_ADDR 0x50100003 +#define LCD_BLK_CTRL CPLD_REG1_ADDR + +static char *amcc_logo = "AMCC 405EP TAIHU EVALUATION KIT"; +static int addr_flag = 0x80; + +static void lcd_bl_ctrl(char val) +{ + out_8((u8 *) LCD_BLK_CTRL, in_8((u8 *) LCD_BLK_CTRL) | val); +} + +static void lcd_putc(int val) +{ + int i = 100; + char addr; + + while (i--) { + if ((in_8((u8 *) LCD_CMD_ADDR) & 0x80) != 0x80) { /*BF = 1 ?*/ + udelay(50); + break; + } + udelay(50); + } + + if (in_8((u8 *) LCD_CMD_ADDR) & 0x80) { + printf("LCD is busy\n"); + return; + } + + addr = in_8((u8 *) LCD_CMD_ADDR); + udelay(50); + if ((addr != 0) && (addr % 0x10 == 0)) { + addr_flag ^= 0x40; + out_8((u8 *) LCD_CMD_ADDR, addr_flag); + } + + udelay(50); + out_8((u8 *) LCD_DATA_ADDR, val); + udelay(50); +} + +static void lcd_puts(char *s) +{ + char *p = s; + int i = 100; + + while (i--) { + if ((in_8((u8 *) LCD_CMD_ADDR) & 0x80) != 0x80) { /*BF = 1 ?*/ + udelay(50); + break; + } + udelay(50); + } + + if (in_8((u8 *) LCD_CMD_ADDR) & 0x80) { + printf("LCD is busy\n"); + return; + } + + while (*p) + lcd_putc(*p++); +} + +static void lcd_put_logo(void) +{ + int i = 100; + char *p = amcc_logo; + + while (i--) { + if ((in_8((u8 *) LCD_CMD_ADDR) & 0x80) != 0x80) { /*BF = 1 ?*/ + udelay(50); + break; + } + udelay(50); + } + + if (in_8((u8 *) LCD_CMD_ADDR) & 0x80) { + printf("LCD is busy\n"); + return; + } + + out_8((u8 *) LCD_CMD_ADDR, 0x80); + while (*p) + lcd_putc(*p++); +} + +int lcd_init(void) +{ + puts("LCD: "); + out_8((u8 *) LCD_CMD_ADDR, 0x38); /* set function:8-bit,2-line,5x7 font type */ + udelay(50); + out_8((u8 *) LCD_CMD_ADDR, 0x0f); /* set display on,cursor on,blink on */ + udelay(50); + out_8((u8 *) LCD_CMD_ADDR, 0x01); /* display clear */ + udelay(2000); + out_8((u8 *) LCD_CMD_ADDR, 0x06); /* set entry */ + udelay(50); + lcd_bl_ctrl(0x02); /* set backlight on */ + lcd_put_logo(); + puts("ready\n"); + + return 0; +} + +static int do_lcd_clear (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[]) +{ + out_8((u8 *) LCD_CMD_ADDR, 0x01); + udelay(2000); + + return 0; +} + +static int do_lcd_puts (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[]) +{ + if (argc < 2) { + printf("%s", cmdtp->usage); + return 1; + } + lcd_puts(argv[1]); + + return 0; +} + +static int do_lcd_putc (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[]) +{ + if (argc < 2) { + printf("%s", cmdtp->usage); + return 1; + } + lcd_putc((char)argv[1][0]); + + return 0; +} + +static int do_lcd_cur (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[]) +{ + ulong count; + ulong dir; + char cur_addr; + + if (argc < 3) { + printf("%s", cmdtp->usage); + return 1; + } + + count = simple_strtoul(argv[1], NULL, 16); + if (count > 31) { + printf("unable to shift > 0x20\n"); + count = 0; + } + + dir = simple_strtoul(argv[2], NULL, 16); + cur_addr = in_8((u8 *) LCD_CMD_ADDR); + udelay(50); + + if (dir == 0x0) { + if (addr_flag == 0x80) { + if (count >= (cur_addr & 0xf)) { + out_8((u8 *) LCD_CMD_ADDR, 0x80); + udelay(50); + count = 0; + } + } else { + if (count >= ((cur_addr & 0x0f) + 0x0f)) { + out_8((u8 *) LCD_CMD_ADDR, 0x80); + addr_flag = 0x80; + udelay(50); + count = 0x0; + } else if (count >= ( cur_addr & 0xf)) { + count -= cur_addr & 0xf ; + out_8((u8 *) LCD_CMD_ADDR, 0x80 | 0xf); + addr_flag = 0x80; + udelay(50); + } + } + } else { + if (addr_flag == 0x80) { + if (count >= (0x1f - (cur_addr & 0xf))) { + count = 0x0; + addr_flag = 0xc0; + out_8((u8 *) LCD_CMD_ADDR, 0xc0 | 0xf); + udelay(50); + } else if ((count + (cur_addr & 0xf ))>= 0x0f) { + count = count + (cur_addr & 0xf) - 0x0f; + addr_flag = 0xc0; + out_8((u8 *) LCD_CMD_ADDR, 0xc0); + udelay(50); + } + } else if ((count + (cur_addr & 0xf )) >= 0x0f) { + count = 0x0; + out_8((u8 *) LCD_CMD_ADDR, 0xC0 | 0x0F); + udelay(50); + } + } + while (count--) { + if (dir == 0) + out_8((u8 *) LCD_CMD_ADDR, 0x10); + else + out_8((u8 *) LCD_CMD_ADDR, 0x14); + udelay(50); + } + + return 0; +} + +U_BOOT_CMD( + lcd_cls, 1, 1, do_lcd_clear, + "lcd_cls - lcd clear display\n", + NULL + ); + +U_BOOT_CMD( + lcd_puts, 2, 1, do_lcd_puts, + "lcd_puts - display string on lcd\n", + "<string> - <string> to be displayed\n" + ); + +U_BOOT_CMD( + lcd_putc, 2, 1, do_lcd_putc, + "lcd_putc - display char on lcd\n", + "<char> - <char> to be displayed\n" + ); + +U_BOOT_CMD( + lcd_cur, 3, 1, do_lcd_cur, + "lcd_cur - shift cursor on lcd\n", + "<count> <dir> - shift cursor on lcd <count> times, direction is <dir> \n" + " <count> - 0..31\n" + " <dir> - 0=backward 1=forward\n" + ); |