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
  29 static int pos; /* Current display position */
  30
  31 /* Handle different display commands */
  32 void 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  */
  48 int 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