| /* |
| * Copyright 2010 Sergey Poselenov, Emcraft Systems, <sposelenov@emcraft.com> |
| * Copyright 2010 Ilya Yanok, Emcraft Systems, <yanok@emcraft.com> |
| * |
| * 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., 51 Franklin Street, Fifth Floor, Boston, |
| * MA 02110-1301, USA. |
| */ |
| |
| #include <common.h> |
| #include <led-display.h> |
| #include <asm/io.h> |
| |
| #ifdef CONFIG_CMD_DISPLAY |
| #define CWORD_CLEAR 0x80 |
| #define CLEAR_DELAY (110 * 2) |
| #define DISPLAY_SIZE 8 |
| |
| static int pos; /* Current display position */ |
| |
| /* Handle different display commands */ |
| void display_set(int cmd) |
| { |
| if (cmd & DISPLAY_CLEAR) { |
| out_8((unsigned char *)CONFIG_SYS_DISP_CWORD, CWORD_CLEAR); |
| udelay(1000 * CLEAR_DELAY); |
| } |
| |
| if (cmd & DISPLAY_HOME) { |
| pos = 0; |
| } |
| } |
| |
| /* |
| * Display a character at the current display position. |
| * Characters beyond the display size are ignored. |
| */ |
| int display_putc(char c) |
| { |
| if (pos >= DISPLAY_SIZE) |
| return -1; |
| |
| out_8((unsigned char *)CONFIG_SYS_DISP_CHR_RAM + pos++, c); |
| |
| return c; |
| } |
| #endif |
