firmware/target/coldfire/mpio/hd200/lcd-hd200.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2010 Marcin Bukat
  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
  22 #include "config.h"
  23
  24 #include "system.h"
  25 #include "kernel.h"
  26 #include "lcd.h"
  27
  28 /*** definitions ***/
  29 /* TOMATO LSI 0350 - definitions and slightly tweaked functions
  30  * taken from lcd-remote-iaudio.c
  31  */
  32
  33 #define LCD_SET_DUTY_RATIO 0x48
  34 #define LCD_SELECT_ADC     0xa0
  35 #define LCD_SELECT_SHL     0xc0
  36 #define LCD_SET_COM0       0x44
  37 #define LCD_OSC_ON         0xab
  38 #define LCD_SELECT_DCDC    0x64
  39 #define LCD_SELECT_RES     0x20
  40 #define LCD_SET_VOLUME     0x81
  41 #define LCD_SET_BIAS       0x50
  42 #define LCD_CONTROL_POWER  0x28
  43 #define LCD_DISPLAY_ON     0xae
  44 #define LCD_SET_INITLINE   0x40
  45 #define LCD_SET_COLUMN     0x10
  46 #define LCD_SET_PAGE       0xb0
  47 #define LCD_SET_GRAY       0x88
  48 #define LCD_SET_PWM_FRC    0x90
  49 #define LCD_SET_POWER_SAVE 0xa8
  50 #define LCD_REVERSE        0xa6
  51 #define LCD_RESET          0xe2
  52
  53 /* cached settings */
  54 static bool cached_invert = false;
  55 static bool cached_flip = false;
  56 static int cached_contrast = DEFAULT_CONTRAST_SETTING;
  57
  58 static struct mutex lcd_mtx;    /* The update functions use DMA and yield */
  59
  60 volatile unsigned char page IBSS_ATTR;
  61 unsigned char column IBSS_ATTR;
  62 unsigned int dma_len IBSS_ATTR;
  63 volatile unsigned long dma_count IBSS_ATTR;
  64
  65 /*** hardware configuration ***/
  66 int lcd_default_contrast(void)
  67 {
  68     return DEFAULT_CONTRAST_SETTING;
  69 }
  70
  71 void lcd_powersave(bool on)
  72 {
  73     if (on)
  74         /* enter power saving mode
  75          * this turns off lcd without controller reset
  76          * probably ~1mA saving
  77          */
  78         lcd_write_command(LCD_SET_POWER_SAVE | 1);
  79     else
  80         /* leave lcd power saving mode
  81          * no need to reset and initialize controller
  82          */
  83         lcd_write_command(LCD_SET_POWER_SAVE | 0);
  84 }
  85
  86 void lcd_set_contrast(int val)
  87 {
  88     if (val < MIN_CONTRAST_SETTING)
  89         val = MIN_CONTRAST_SETTING;
  90     else if (val > MAX_CONTRAST_SETTING)
  91         val = MAX_CONTRAST_SETTING;
  92
  93     cached_contrast = val;
  94     lcd_write_command_e(LCD_SET_VOLUME, val);
  95 }
  96
  97 void lcd_set_invert_display(bool yesno)
  98 {
  99     cached_invert = yesno;
 100     lcd_write_command(LCD_REVERSE | yesno);
 101
 102 }
 103
 104 /* turn the display upside down (call lcd_update() afterwards) */
 105 void lcd_set_flip(bool yesno)
 106 {
 107     cached_flip = yesno;
 108     if(yesno)
 109     {
 110         lcd_write_command(LCD_SELECT_ADC | 1);
 111         lcd_write_command(LCD_SELECT_SHL | 0);
 112         lcd_write_command_e(LCD_SET_COM0, 0);
 113     }
 114     else
 115     {
 116         lcd_write_command(LCD_SELECT_ADC | 0);
 117         lcd_write_command(LCD_SELECT_SHL | 8);
 118         lcd_write_command_e(LCD_SET_COM0, 0);
 119     }
 120 }
 121
 122 void lcd_shutdown(void)
 123 {
 124     /* Set power save -> Power OFF (VDD - VSS) .. that's it */
 125     lcd_write_command(LCD_SET_POWER_SAVE | 1);
 126 }
 127
 128 void lcd_init_device(void)
 129 {
 130     and_l(~0x00000800, &GPIO_FUNCTION); /* CS3 line */
 131
 132     /* LCD Reset GPO34 */
 133     or_l(0x00000004, &GPIO1_ENABLE);    /* set as output */
 134     or_l(0x00000004, &GPIO1_FUNCTION);  /* switch to secondary function - GPIO */
 135
 136     and_l(~0x00000004, &GPIO1_OUT);     /* RESET low */
 137     sleep(1);                           /* delay at least 1000 ns */
 138     or_l(0x00000004, &GPIO1_OUT);       /* RESET high */
 139     sleep(1);
 140
 141     /* parameters setup taken from original firmware */
 142     lcd_write_command(LCD_RESET);
 143     lcd_write_command_e(LCD_SET_DUTY_RATIO,0x80); /* 1/128 */
 144     lcd_write_command(LCD_OSC_ON);
 145     lcd_write_command(LCD_SELECT_DCDC | 3); /* DC/DC 6xboost */
 146     lcd_write_command(LCD_SELECT_RES | 7); /* Regulator resistor: 7.2 */
 147     lcd_write_command(LCD_SET_BIAS | 6); /* 1/11 */
 148     lcd_write_command(LCD_SET_PWM_FRC | 6); /* 3FRC + 12PWM */
 149     lcd_write_command_e(LCD_SET_GRAY | 0, 0x00);
 150     lcd_write_command_e(LCD_SET_GRAY | 1, 0x00);
 151     lcd_write_command_e(LCD_SET_GRAY | 2, 0x0c);
 152     lcd_write_command_e(LCD_SET_GRAY | 3, 0x00);
 153     lcd_write_command_e(LCD_SET_GRAY | 4, 0xc4);
 154     lcd_write_command_e(LCD_SET_GRAY | 5, 0x00);
 155     lcd_write_command_e(LCD_SET_GRAY | 6, 0xcc);
 156     lcd_write_command_e(LCD_SET_GRAY | 7, 0x00);
 157
 158     lcd_write_command(LCD_CONTROL_POWER | 7); /* All circuits ON */
 159     lcd_write_command(LCD_DISPLAY_ON | 1); /* display on */
 160
 161     lcd_set_flip(cached_flip);
 162     lcd_set_contrast(cached_contrast);
 163     lcd_set_invert_display(cached_invert);
 164
 165     /* Configure DMA3 */
 166     DAR3 = 0xf0000002;
 167     DSR3 = 1;
 168     DIVR3 = 57;        /* DMA3 is mapped into vector 57 in system.c */
 169     ICR9 = (6 << 2);   /* Enable DMA3 interrupt at level 6, priority 0 */
 170     coldfire_imr_mod(0, 1 << 17);
 171
 172     mutex_init(&lcd_mtx);
 173
 174     lcd_update();
 175 }
 176
 177 /* LCD DMA ISR */
 178 void DMA3(void) __attribute__ ((interrupt_handler, section(".icode")));
 179 void DMA3(void)
 180 {
 181     DSR3 = 1;
 182
 183     if (--dma_count > 0)
 184     {
 185         /* Setup write address in lcd controller ram*/
 186         lcd_write_command(LCD_SET_PAGE | ++page);
 187         lcd_write_command_e(LCD_SET_COLUMN | ((column >> 4) & 0xf),
 188                             column & 0x0f);
 189
 190         SAR3 = (unsigned long)FBADDR(column,page);
 191         BCR3 = dma_len;
 192         DCR3 = DMA_INT | DMA_AA | DMA_BWC(1)
 193              | DMA_SINC | DMA_SSIZE(DMA_SIZE_LINE)
 194              | DMA_DSIZE(DMA_SIZE_BYTE) | DMA_START;
 195
 196     }
 197 }
 198
 199 /* Update the display.
 200    This must be called after all other LCD functions that change the display. */
 201 void lcd_update(void) ICODE_ATTR;
 202 void lcd_update(void)
 203 {
 204     mutex_lock(&lcd_mtx);
 205
 206     /* Setup initial address in lcd controller */
 207     lcd_write_command(LCD_SET_PAGE | 0);
 208     lcd_write_command_e(LCD_SET_COLUMN, 0);
 209
 210     /* Initial lcd ram address */
 211     page = 0;
 212     column = 0;
 213
 214     /* Number of pages to address */
 215     dma_count = LCD_FBHEIGHT;
 216
 217     /* Transfer size in bytes to the given page */
 218     dma_len = LCD_WIDTH*2;
 219
 220     /* Initialize DMA transfer */
 221     SAR3 = (unsigned long)lcd_framebuffer;
 222     BCR3 = LCD_WIDTH*2;
 223     DCR3 = DMA_INT | DMA_AA | DMA_BWC(1)
 224          | DMA_SINC | DMA_SSIZE(DMA_SIZE_LINE)
 225          | DMA_DSIZE(DMA_SIZE_BYTE) | DMA_START;
 226
 227     while (dma_count > 0)
 228         yield();
 229
 230     mutex_unlock(&lcd_mtx);
 231 }
 232
 233 /* Update a fraction of the display. */
 234 void lcd_update_rect(int, int, int, int) ICODE_ATTR;
 235 void lcd_update_rect(int x, int y, int width, int height)
 236 {
 237     int ymax;
 238
 239     /* The Y coordinates have to work on even 8 pixel rows */
 240     ymax = (y + height-1) >> 3;
 241     y >>= 3;
 242
 243     if (x + width > LCD_WIDTH)
 244         width = LCD_WIDTH - x;
 245
 246     if (width <= 0)
 247         return; /* nothing left to do, 0 is harmful to lcd_write_data() */
 248
 249     mutex_lock(&lcd_mtx);
 250
 251     if (ymax >= LCD_FBHEIGHT)
 252         ymax = LCD_FBHEIGHT-1;
 253
 254     /* Initial lcd ram address*/
 255     lcd_write_command(LCD_SET_PAGE | y );
 256     lcd_write_command_e(LCD_SET_COLUMN | ((x >> 4) & 0xf), x & 0x0f);
 257
 258     page = y;
 259     column = x;
 260     dma_len = width*2;
 261     dma_count = ymax - y + 1;
 262
 263     /* Initialize DMA transfer */
 264     SAR3 = (unsigned long)FBADDR(column,page);
 265     BCR3 = dma_len;
 266     DCR3 = DMA_INT | DMA_AA | DMA_BWC(1)
 267          | DMA_SINC | DMA_SSIZE(DMA_SIZE_LINE)
 268          | DMA_DSIZE(DMA_SIZE_BYTE) | DMA_START;
 269
 270     while (dma_count > 0)
 271         yield();
 272
 273     mutex_unlock(&lcd_mtx);
 274
 275 }
 276
 277 /* Helper function. */
 278 void lcd_mono_data(const unsigned char *data, int count);
 279
 280 /* Performance function that works with an external buffer
 281    note that by and bheight are in 8-pixel units! */
 282 void lcd_blit_mono(const unsigned char *data, int x, int by, int width,
 283                    int bheight, int stride)
 284 {
 285     while (bheight--)
 286     {
 287         lcd_write_command(LCD_SET_PAGE | (by & 0xf));
 288         lcd_write_command_e(LCD_SET_COLUMN | ((x >> 4) & 0xf), x & 0xf);
 289
 290         lcd_mono_data(data, width);
 291         data += stride;
 292         by++;
 293     }
 294 }
 295
 296 /* Helper function for lcd_grey_phase_blit(). */
 297 void lcd_grey_data(unsigned char *values, unsigned char *phases, int count);
 298
 299 /* Performance function that works with an external buffer
 300    note that by and bheight are in 8-pixel units! */
 301 void lcd_blit_grey_phase(unsigned char *values, unsigned char *phases,
 302                          int x, int by, int width, int bheight, int stride)
 303 {
 304     stride <<= 3; /* 8 pixels per block */
 305
 306     while (bheight--)
 307     {
 308         lcd_write_command(LCD_SET_PAGE | (by & 0xf));
 309         lcd_write_command_e(LCD_SET_COLUMN | ((x >> 4) & 0xf), x & 0xf);
 310
 311         lcd_grey_data(values, phases, width);
 312         values += stride;
 313         phases += stride;
 314         by++;
 315     }
 316 }
 317