LXR uboot/drivers/misc/pdsp188x.c

   1/*
   2 * Copyright 2010 Sergey Poselenov, Emcraft Systems, <sposelenov@emcraft.com>
   3 * Copyright 2010 Ilya Yanok, Emcraft Systems, <yanok@emcraft.com>
   4 *
   5 * This program is free software; you can redistribute it and/or
   6 * modify it under the terms of the GNU General Public License
   7 * as published by the Free Software Foundation; either version 2
   8 * of the License, or (at your option) any later version.
   9 * This program is distributed in the hope that it will be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write to the Free Software
  16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  17 * MA 02110-1301, USA.
  18 */
  19
  20#include <common.h>
  21#include <led-display.h>
  22#include <asm/io.h>
  23
  24#ifdef CONFIG_CMD_DISPLAY
  25#define CWORD_CLEAR     0x80
  26#define CLEAR_DELAY     (110 * 2)
  27#define DISPLAY_SIZE    8
  28
  29static int pos; /* Current display position */
  30
  31/* Handle different display commands */
  32void display_set(int cmd)
  33{
  34        if (cmd & DISPLAY_CLEAR) {
  35                out_8((unsigned char *)CONFIG_SYS_DISP_CWORD, CWORD_CLEAR);
  36                udelay(1000 * CLEAR_DELAY);
  37        }
  38
  39        if (cmd & DISPLAY_HOME) {
  40                pos = 0;
  41        }
  42}
  43
  44/*
  45 * Display a character at the current display position.
  46 * Characters beyond the display size are ignored.
  47 */
  48int display_putc(char c)
  49{
  50        if (pos >= DISPLAY_SIZE)
  51                return -1;
  52
  53        out_8((unsigned char *)CONFIG_SYS_DISP_CHR_RAM + pos++, c);
  54
  55        return c;
  56}
  57#endif
  58