firmware/target/arm/as3525/sansa-clip/lcd-clip.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2008 François Dinel
  11  * Copyright (C) 2008-2009 Rafaël Carré
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  ****************************************************************************/
  22 #include "config.h"
  23
  24 #include "lcd.h"
  25 #include "lcd-clip.h"
  26 #include "system.h"
  27 #include "cpu.h"
  28
  29 void lcd_hw_init(void)
  30 {
  31 /* DBOP initialisation, do what OF does */
  32     CGU_DBOP = (1<<3) | AS3525_DBOP_DIV;
  33
  34     GPIOB_AFSEL = 0x08; /* DBOP on pin 3 */
  35     GPIOC_AFSEL = 0x0f; /* DBOP on pins 3:0 */
  36
  37     DBOP_CTRL      = 0x51008;
  38     DBOP_TIMPOL_01 = 0x6E167;
  39     DBOP_TIMPOL_23 = 0xA167E06F;
  40
  41     GPIOA_DIR |= 0x33; /* pins 5:4 and 1:0 out */
  42     GPIOB_DIR |= 0x40; /* pin 6 out */
  43
  44     GPIOA_PIN(1) = (1<<1);
  45     GPIOA_PIN(0) = (1<<0);
  46     GPIOA_PIN(4) = 0;
  47     GPIOB_PIN(6) = (1<<6);
  48 }
  49
  50 #define LCD_DELAY 1
  51
  52 void lcd_write_command(int byte)
  53 {
  54     volatile int i = 0;
  55     while(i<LCD_DELAY) i++;
  56
  57     /* unset D/C# (data or command) */
  58     GPIOA_PIN(5) = 0;
  59
  60     /* Write command */
  61     /* Only bits 15:12 and 3:0 of DBOP_DOUT are meaningful */
  62     DBOP_DOUT = (byte << 8) | byte;
  63
  64     /* While push fifo is not empty */
  65     while ((DBOP_STAT & (1<<10)) == 0)
  66         ;
  67 }
  68
  69 void lcd_write_data(const fb_data* p_bytes, int count)
  70 {
  71     volatile int i = 0;
  72     while(i<LCD_DELAY) i++;
  73
  74     /* set D/C# (data or command) */
  75     GPIOA_PIN(5) = (1<<5);
  76
  77     while (count--)
  78     {
  79         /* Write pixels */
  80         /* Only bits 15:12 and 3:0 of DBOP_DOUT are meaningful */
  81         DBOP_DOUT = (*p_bytes << 8) | *p_bytes;
  82
  83         p_bytes++; /* next packed pixels */
  84
  85         /* Wait if push fifo is full */
  86         while ((DBOP_STAT & (1<<6)) != 0);
  87     }
  88     /* While push fifo is not empty */
  89     while ((DBOP_STAT & (1<<10)) == 0);
  90 }