firmware/target/arm/pnx0101/iriver-ifp7xx/lcd-ifp7xx.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 by Alan Korr
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #include "config.h"
  22
  23 #include "kernel.h"
  24 #include "lcd.h"
  25 #include "system.h"
  26
  27 /*** definitions ***/
  28
  29 #define LCD_SET_LOWER_COLUMN_ADDRESS              ((char)0x00)
  30 #define LCD_SET_HIGHER_COLUMN_ADDRESS             ((char)0x10)
  31 #define LCD_SET_INTERNAL_REGULATOR_RESISTOR_RATIO ((char)0x20)
  32 #define LCD_SET_POWER_CONTROL_REGISTER            ((char)0x28)
  33 #define LCD_SET_DISPLAY_START_LINE                ((char)0x40)
  34 #define LCD_SET_CONTRAST_CONTROL_REGISTER         ((char)0x81)
  35 #define LCD_SET_SEGMENT_REMAP                     ((char)0xA0)
  36 #define LCD_SET_LCD_BIAS                          ((char)0xA2)
  37 #define LCD_SET_ENTIRE_DISPLAY_OFF                ((char)0xA4)
  38 #define LCD_SET_ENTIRE_DISPLAY_ON                 ((char)0xA5)
  39 #define LCD_SET_NORMAL_DISPLAY                    ((char)0xA6)
  40 #define LCD_SET_REVERSE_DISPLAY                   ((char)0xA7)
  41 #define LCD_SET_MULTIPLEX_RATIO                   ((char)0xA8)
  42 #define LCD_SET_BIAS_TC_OSC                       ((char)0xA9)
  43 #define LCD_SET_1OVER4_BIAS_RATIO                 ((char)0xAA)
  44 #define LCD_SET_INDICATOR_OFF                     ((char)0xAC)
  45 #define LCD_SET_INDICATOR_ON                      ((char)0xAD)
  46 #define LCD_SET_DISPLAY_OFF                       ((char)0xAE)
  47 #define LCD_SET_DISPLAY_ON                        ((char)0xAF)
  48 #define LCD_SET_PAGE_ADDRESS                      ((char)0xB0)
  49 #define LCD_SET_COM_OUTPUT_SCAN_DIRECTION         ((char)0xC0)
  50 #define LCD_SET_TOTAL_FRAME_PHASES                ((char)0xD2)
  51 #define LCD_SET_DISPLAY_OFFSET                    ((char)0xD3)
  52 #define LCD_SET_READ_MODIFY_WRITE_MODE            ((char)0xE0)
  53 #define LCD_SOFTWARE_RESET                        ((char)0xE2)
  54 #define LCD_NOP                                   ((char)0xE3)
  55 #define LCD_SET_END_OF_READ_MODIFY_WRITE_MODE     ((char)0xEE)
  56
  57 /* LCD command codes */
  58 #define LCD_CNTL_RESET          0xe2    /* Software reset */
  59 #define LCD_CNTL_POWER          0x2f    /* Power control */
  60 #define LCD_CNTL_CONTRAST       0x81    /* Contrast */
  61 #define LCD_CNTL_OUTSCAN        0xc8    /* Output scan direction */
  62 #define LCD_CNTL_SEGREMAP       0xa1    /* Segment remap */
  63 #define LCD_CNTL_DISPON         0xaf    /* Display on */
  64
  65 #define LCD_CNTL_PAGE           0xb0    /* Page address */
  66 #define LCD_CNTL_HIGHCOL        0x10    /* Upper column address */
  67 #define LCD_CNTL_LOWCOL         0x00    /* Lower column address */
  68
  69 /*** driver routines ***/
  70
  71 void lcd_write_command(int cmd)
  72 {
  73     while ((LCDSTAT & 3) != 3);
  74     LCDCMD = cmd;
  75 }
  76
  77 void lcd_write_data( const unsigned char* data, int count )
  78 {
  79     int i;
  80     for (i=0; i < count; i++) {
  81         while ((LCDSTAT & 3) != 3);
  82         LCDDATA = data[i];
  83     }
  84 }
  85
  86 /*** hardware configuration ***/
  87
  88 int lcd_default_contrast(void)
  89 {
  90     return 45;
  91 }
  92
  93 void lcd_set_contrast(int val)
  94 {
  95     lcd_write_command(LCD_CNTL_CONTRAST);
  96     lcd_write_command(val);
  97 }
  98
  99 void lcd_set_invert_display(bool yesno)
 100 {
 101     if (yesno)
 102         lcd_write_command(LCD_SET_REVERSE_DISPLAY);
 103     else
 104         lcd_write_command(LCD_SET_NORMAL_DISPLAY);
 105 }
 106
 107 /* turn the display upside down (call lcd_update() afterwards) */
 108 void lcd_set_flip(bool yesno)
 109 {
 110     if (yesno)
 111     {
 112         lcd_write_command(LCD_SET_SEGMENT_REMAP);
 113         lcd_write_command(LCD_SET_COM_OUTPUT_SCAN_DIRECTION);
 114     }
 115     else
 116     {
 117         lcd_write_command(LCD_SET_SEGMENT_REMAP | 0x01);
 118         lcd_write_command(LCD_SET_COM_OUTPUT_SCAN_DIRECTION | 0x08);
 119     }
 120 }
 121
 122 void lcd_init_device(void)
 123 {
 124     LCDREG10 = 0xf;
 125     LCDREG04 = 0x4084;
 126
 127     /* inits like the original firmware */
 128     lcd_write_command(LCD_SOFTWARE_RESET);
 129     lcd_write_command(LCD_SET_INTERNAL_REGULATOR_RESISTOR_RATIO + 4);
 130     lcd_write_command(LCD_SET_LCD_BIAS);
 131     lcd_write_command(LCD_SET_POWER_CONTROL_REGISTER + 7);
 132                /* power control register: op-amp=1, regulator=1, booster=1 */
 133     lcd_write_command(LCD_SET_DISPLAY_ON);
 134     lcd_write_command(LCD_SET_NORMAL_DISPLAY);
 135     lcd_set_flip(false);
 136     lcd_write_command(LCD_SET_DISPLAY_START_LINE + 0);
 137     lcd_set_contrast(lcd_default_contrast());
 138     lcd_write_command(LCD_SET_PAGE_ADDRESS);
 139     lcd_write_command(LCD_SET_LOWER_COLUMN_ADDRESS + 0);
 140     lcd_write_command(LCD_SET_HIGHER_COLUMN_ADDRESS + 0);
 141
 142     lcd_clear_display();
 143     lcd_update();
 144 }
 145
 146 /*** Update functions ***/
 147
 148 /* Performance function that works with an external buffer
 149    note that by and bheight are in 8-pixel units! */
 150 void lcd_blit_mono(const unsigned char *data, int x, int by, int width,
 151                    int bheight, int stride)
 152 {
 153     /* Copy display bitmap to hardware */
 154     while (bheight--)
 155     {
 156         lcd_write_command (LCD_CNTL_PAGE | (by++ & 0xf));
 157         lcd_write_command (LCD_CNTL_HIGHCOL | (((x+4)>>4) & 0xf));
 158         lcd_write_command (LCD_CNTL_LOWCOL | ((x+4) & 0xf));
 159
 160         lcd_write_data(data, width);
 161         data += stride;
 162     }
 163 }
 164
 165
 166 /* Performance function that works with an external buffer
 167    note that by and bheight are in 8-pixel units! */
 168 void lcd_blit_grey_phase(unsigned char *values, unsigned char *phases,
 169                          int x, int by, int width, int bheight, int stride)
 170 {
 171     (void)values;
 172     (void)phases;
 173     (void)x;
 174     (void)by;
 175     (void)width;
 176     (void)bheight;
 177     (void)stride;
 178 }
 179
 180 /* Update the display.
 181    This must be called after all other LCD functions that change the display. */
 182 void lcd_update(void) ICODE_ATTR;
 183 void lcd_update(void)
 184 {
 185     int y;
 186
 187     /* Copy display bitmap to hardware */
 188     for (y = 0; y < LCD_FBHEIGHT; y++)
 189     {
 190         lcd_write_command (LCD_CNTL_PAGE | (y & 0xf));
 191         lcd_write_command (LCD_CNTL_HIGHCOL);
 192         lcd_write_command (LCD_CNTL_LOWCOL | 4);
 193
 194         lcd_write_data (FBADDR(0, y), LCD_WIDTH);
 195     }
 196 }
 197
 198 /* Update a fraction of the display. */
 199 void lcd_update_rect(int, int, int, int) ICODE_ATTR;
 200 void lcd_update_rect(int x, int y, int width, int height)
 201 {
 202     int ymax;
 203
 204     /* The Y coordinates have to work on even 8 pixel rows */
 205     ymax = (y + height-1) >> 3;
 206     y >>= 3;
 207
 208     if(x + width > LCD_WIDTH)
 209         width = LCD_WIDTH - x;
 210     if (width <= 0)
 211         return; /* nothing left to do, 0 is harmful to lcd_write_data() */
 212     if(ymax >= LCD_FBHEIGHT)
 213         ymax = LCD_FBHEIGHT-1;
 214
 215     /* Copy specified rectange bitmap to hardware */
 216     for (; y <= ymax; y++)
 217     {
 218         lcd_write_command (LCD_CNTL_PAGE | (y & 0xf));
 219         lcd_write_command (LCD_CNTL_HIGHCOL | (((x+4) >> 4) & 0xf));
 220         lcd_write_command (LCD_CNTL_LOWCOL | ((x+4) & 0xf));
 221
 222         lcd_write_data (FBADDR(x,y), width);
 223     }
 224 }