firmware/target/arm/lcd-ssd1815.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 "hwcompat.h"
  24 #include "kernel.h"
  25 #include "lcd.h"
  26 #include "system.h"
  27 #include "cpu.h"
  28
  29 /*** definitions ***/
  30
  31 #define LCD_SET_LOWER_COLUMN_ADDRESS              ((char)0x00)
  32 #define LCD_SET_HIGHER_COLUMN_ADDRESS             ((char)0x10)
  33 #define LCD_SET_INTERNAL_REGULATOR_RESISTOR_RATIO ((char)0x20)
  34 #define LCD_SET_POWER_CONTROL_REGISTER            ((char)0x28)
  35 #define LCD_SET_DISPLAY_START_LINE                ((char)0x40)
  36 #define LCD_SET_CONTRAST_CONTROL_REGISTER         ((char)0x81)
  37 #define LCD_SET_SEGMENT_REMAP                     ((char)0xA0)
  38 #define LCD_SET_LCD_BIAS                          ((char)0xA2)
  39 #define LCD_SET_ENTIRE_DISPLAY_OFF                ((char)0xA4)
  40 #define LCD_SET_ENTIRE_DISPLAY_ON                 ((char)0xA5)
  41 #define LCD_SET_NORMAL_DISPLAY                    ((char)0xA6)
  42 #define LCD_SET_REVERSE_DISPLAY                   ((char)0xA7)
  43 #define LCD_SET_MULTIPLEX_RATIO                   ((char)0xA8)
  44 #define LCD_SET_BIAS_TC_OSC                       ((char)0xA9)
  45 #define LCD_SET_1OVER4_BIAS_RATIO                 ((char)0xAA)
  46 #define LCD_SET_INDICATOR_OFF                     ((char)0xAC)
  47 #define LCD_SET_INDICATOR_ON                      ((char)0xAD)
  48 #define LCD_SET_DISPLAY_OFF                       ((char)0xAE)
  49 #define LCD_SET_DISPLAY_ON                        ((char)0xAF)
  50 #define LCD_SET_PAGE_ADDRESS                      ((char)0xB0)
  51 #define LCD_SET_COM_OUTPUT_SCAN_DIRECTION         ((char)0xC0)
  52 #define LCD_SET_TOTAL_FRAME_PHASES                ((char)0xD2)
  53 #define LCD_SET_DISPLAY_OFFSET                    ((char)0xD3)
  54 #define LCD_SET_READ_MODIFY_WRITE_MODE            ((char)0xE0)
  55 #define LCD_SOFTWARE_RESET                        ((char)0xE2)
  56 #define LCD_NOP                                   ((char)0xE3)
  57 #define LCD_SET_END_OF_READ_MODIFY_WRITE_MODE     ((char)0xEE)
  58
  59 /* LCD command codes */
  60 #define LCD_CNTL_RESET          0xe2    /* Software reset */
  61 #define LCD_CNTL_POWER          0x2f    /* Power control */
  62 #define LCD_CNTL_CONTRAST       0x81    /* Contrast */
  63 #define LCD_CNTL_OUTSCAN        0xc8    /* Output scan direction */
  64 #define LCD_CNTL_SEGREMAP       0xa1    /* Segment remap */
  65 #define LCD_CNTL_DISPON         0xaf    /* Display on */
  66
  67 #define LCD_CNTL_PAGE           0xb0    /* Page address */
  68 #define LCD_CNTL_HIGHCOL        0x10    /* Upper column address */
  69 #define LCD_CNTL_LOWCOL         0x00    /* Lower column address */
  70
  71
  72 #if CONFIG_CPU == AS3525
  73 #include "as3525.h"
  74 #include "clock-target.h"
  75
  76 void lcd_write_command(int byte)
  77 {
  78     DBOP_TIMPOL_23 = 0x6006E;
  79     DBOP_DOUT = byte;
  80
  81     /* While push fifo is not empty */
  82     while ((DBOP_STAT & (1<<10)) == 0)
  83                 ;
  84     DBOP_TIMPOL_23 = 0x6E06F;
  85 }
  86
  87 void lcd_write_data(const fb_data* p_bytes, int count)
  88 {
  89     while (count--)
  90     {
  91         /* Write pixels */
  92         DBOP_DOUT = *p_bytes++;
  93
  94         /* While push fifo is not empty */
  95         while ((DBOP_STAT & (1<<10)) == 0)
  96             ;
  97         /* delay a bit. value arbitrary */
  98         int i = 0;
  99         while(i < 15)
 100            i++;
 101     }
 102 }
 103
 104 static inline void ams3525_dbop_init(void)
 105 {
 106     CGU_DBOP |= (1<<3) | CLK_DIV(AS3525_PCLK_FREQ, AS3525_DBOP_FREQ);
 107
 108     GPIOB_AFSEL = 0x0f; /* DBOP on pin 3:0 */
 109     GPIOC_AFSEL = 0xff; /* DBOP on pins 7:0 */
 110
 111     DBOP_CTRL      = 0x50008;
 112     DBOP_TIMPOL_01 = 0xA167E167;
 113     DBOP_TIMPOL_23 = 0x6E06F; /* this value is used for data (pixels) write */
 114 }
 115
 116
 117 /* LCD init, largely based on what OF does */
 118 void lcd_init_device(void)
 119 {
 120     int delay;
 121
 122     ams3525_dbop_init();
 123
 124     GPIOB_DIR |= (1<<4);
 125     GPIOD_DIR |= (1<<1)|(1<<3);
 126
 127     GPIOD_PIN(1) = (1<<1); /* backlight on */
 128
 129     GPIOD_PIN(3) = (1<<3);
 130     delay = 10; while(delay--) ;
 131
 132     GPIOB_PIN(4) = (1<<4);
 133     delay = 10; while(delay--) ;
 134
 135     lcd_write_command(LCD_SET_LCD_BIAS);
 136     lcd_write_command(LCD_SET_SEGMENT_REMAP);
 137     lcd_write_command(LCD_SET_COM_OUTPUT_SCAN_DIRECTION);
 138     lcd_write_command(LCD_SET_INTERNAL_REGULATOR_RESISTOR_RATIO|0x5);
 139     lcd_set_contrast(lcd_default_contrast());
 140     lcd_write_command(LCD_SET_REVERSE_DISPLAY);
 141     lcd_write_command(LCD_SET_POWER_CONTROL_REGISTER|0x7);
 142     lcd_write_command(LCD_SET_DISPLAY_ON);
 143     lcd_write_command(LCD_SET_DISPLAY_START_LINE);
 144     lcd_write_command(LCD_SET_NORMAL_DISPLAY);
 145 }
 146
 147
 148 #elif defined(CPU_TCC77X)
 149
 150 /* TCC77x specific defines */
 151 #define LCD_BASE 0x50000000
 152 #define LCD_CMD   *(volatile unsigned char*)(LCD_BASE)
 153 #define LCD_DATA  *(volatile unsigned char*)(LCD_BASE+1)
 154
 155 void lcd_write_command(int byte)
 156 {
 157     LCD_CMD = byte;
 158
 159     asm volatile (
 160         "nop      \n\t"
 161         "nop      \n\t"
 162         "nop      \n\t"
 163     );
 164 }
 165
 166 void lcd_write_data(const fb_data* p_bytes, int count)
 167 {
 168     while (count--)
 169     {
 170         LCD_DATA = *(p_bytes++);
 171
 172         asm volatile (
 173             "nop      \n\t"
 174             "nop      \n\t"
 175             "nop      \n\t"
 176         );
 177     }
 178 }
 179
 180 /* LCD init */
 181 void lcd_init_device(void)
 182 {
 183     uint32_t bus_width;
 184
 185     /* Telechips init the same as the original firmware */
 186     CSCFG1 &= 0xc3ffc000;
 187     CSCFG1 |= 0x3400101a;
 188     CSCFG1 |= (1 << 21);
 189     CSCFG1 &= ~(1 << 21);
 190
 191     bus_width = ((MCFG >> 11) & 0x3) ^ 3;
 192
 193     CSCFG1 = (bus_width << 28) |
 194              (3 << 26) |                 /* MTYPE = 3 */
 195              ((LCD_BASE >> 28) << 22) |  /* CSBASE = 0x5 */
 196              (1 << 20) |                 /* Unknown */
 197              (3 << 11) |                 /* Setup time = 3 cycles */
 198              (3 << 3) |                  /* Pulse width = 3+1 cycles */
 199              (1 << 0);                   /* Hold time = 1 cycle */
 200
 201     /* SSD1815 inits like the original firmware */
 202     lcd_write_command(LCD_SET_DISPLAY_OFF);
 203     lcd_set_flip(false);
 204     lcd_write_command(LCD_SET_INTERNAL_REGULATOR_RESISTOR_RATIO | 5);
 205     lcd_set_contrast(lcd_default_contrast());
 206     lcd_write_command(LCD_SET_POWER_CONTROL_REGISTER | 7);
 207                /* power control register: op-amp=1, regulator=1, booster=1 */
 208     lcd_write_command(LCD_SET_BIAS_TC_OSC);
 209
 210     /* 0xc2 = 110 000 10: Osc. Freq 110 - ???
 211                           TC value 000  - "-0.01%/C (TC0, POR)"
 212                           Bias ratio 10 - "1/9, 1/7 (POR)"
 213      */
 214     lcd_write_command(0xc2);
 215     lcd_write_command(LCD_SET_DISPLAY_ON);
 216
 217     lcd_clear_display();
 218     lcd_update();
 219 }
 220
 221 /* End of TCC77x specific defines */
 222 #endif
 223
 224
 225 /** globals **/
 226
 227 static int xoffset; /* needed for flip */
 228
 229 /*** hardware configuration ***/
 230
 231 int lcd_default_contrast(void)
 232 {
 233     return 0x1f;
 234 }
 235
 236 void lcd_set_contrast(int val)
 237 {
 238     lcd_write_command(LCD_CNTL_CONTRAST);
 239     lcd_write_command(val);
 240 }
 241
 242 void lcd_set_invert_display(bool yesno)
 243 {
 244     if (yesno)
 245         lcd_write_command(LCD_SET_REVERSE_DISPLAY);
 246     else
 247         lcd_write_command(LCD_SET_NORMAL_DISPLAY);
 248 }
 249
 250 /* turn the display upside down (call lcd_update() afterwards) */
 251 void lcd_set_flip(bool yesno)
 252 {
 253     (void)yesno;
 254     /* TODO */
 255 }
 256
 257
 258 /*** Update functions ***/
 259
 260 /* Performance function that works with an external buffer
 261    note that by and bheight are in 8-pixel units! */
 262 void lcd_blit_mono(const unsigned char *data, int x, int by, int width,
 263                    int bheight, int stride)
 264 {
 265     /* Copy display bitmap to hardware */
 266     while (bheight--)
 267     {
 268         lcd_write_command (LCD_CNTL_PAGE | (by++ & 0xf));
 269         lcd_write_command (LCD_CNTL_HIGHCOL | (((x+xoffset)>>4) & 0xf));
 270         lcd_write_command (LCD_CNTL_LOWCOL | ((x+xoffset) & 0xf));
 271
 272         lcd_write_data(data, width);
 273         data += stride;
 274     }
 275 }
 276
 277
 278 /* Performance function that works with an external buffer
 279    note that by and bheight are in 8-pixel units! */
 280 void lcd_blit_grey_phase(unsigned char *values, unsigned char *phases,
 281                          int x, int by, int width, int bheight, int stride)
 282 {
 283     (void)values;
 284     (void)phases;
 285     (void)x;
 286     (void)by;
 287     (void)width;
 288     (void)bheight;
 289     (void)stride;
 290 }
 291
 292 /* Update the display.
 293    This must be called after all other LCD functions that change the display. */
 294 void lcd_update(void) ICODE_ATTR;
 295 void lcd_update(void)
 296 {
 297     int y;
 298
 299     /* Copy display bitmap to hardware */
 300     for (y = 0; y < LCD_FBHEIGHT; y++)
 301     {
 302         lcd_write_command (LCD_CNTL_PAGE | (y & 0xf));
 303         lcd_write_command (LCD_CNTL_HIGHCOL | ((xoffset >> 4) & 0xf));
 304         lcd_write_command (LCD_CNTL_LOWCOL | (xoffset & 0xf));
 305
 306         lcd_write_data (FBADDR(0, y), LCD_WIDTH);
 307     }
 308 }
 309
 310 /* Update a fraction of the display. */
 311 void lcd_update_rect(int, int, int, int) ICODE_ATTR;
 312 void lcd_update_rect(int x, int y, int width, int height)
 313 {
 314     int ymax;
 315
 316     /* The Y coordinates have to work on even 8 pixel rows */
 317     ymax = (y + height-1) >> 3;
 318     y >>= 3;
 319
 320     if(x + width > LCD_WIDTH)
 321         width = LCD_WIDTH - x;
 322     if (width <= 0)
 323         return; /* nothing left to do, 0 is harmful to lcd_write_data() */
 324     if(ymax >= LCD_FBHEIGHT)
 325         ymax = LCD_FBHEIGHT-1;
 326
 327     /* Copy specified rectange bitmap to hardware */
 328     for (; y <= ymax; y++)
 329     {
 330         lcd_write_command (LCD_CNTL_PAGE | (y & 0xf));
 331         lcd_write_command (LCD_CNTL_HIGHCOL | (((x+xoffset) >> 4) & 0xf));
 332         lcd_write_command (LCD_CNTL_LOWCOL | ((x+xoffset) & 0xf));
 333
 334         lcd_write_data (FBADDR(x,y), width);
 335     }
 336 }