board/trab/vfd.c

   1 /*
   2  * (C) Copyright 2001
   3  * Wolfgang Denk, DENX Software Engineering -- wd@denx.de
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 /************************************************************************/
  25 /* ** DEBUG SETTINGS                                                    */
  26 /************************************************************************/
  27
  28 /* #define DEBUG        */
  29
  30 /************************************************************************/
  31 /* ** HEADER FILES                                                      */
  32 /************************************************************************/
  33
  34 #include <config.h>
  35 #include <common.h>
  36 #include <version.h>
  37 #include <stdarg.h>
  38 #include <linux/types.h>
  39 #include <devices.h>
  40 #include <s3c2400.h>
  41
  42 #ifdef CONFIG_VFD
  43
  44 /************************************************************************/
  45 /* ** CONFIG STUFF -- should be moved to board config file              */
  46 /************************************************************************/
  47
  48 /************************************************************************/
  49
  50 #ifndef PAGE_SIZE
  51 #define PAGE_SIZE       4096
  52 #endif
  53
  54 #define ROT     0x09
  55 #define BLAU    0x0C
  56 #define VIOLETT 0X0D
  57
  58 /* MAGIC */
  59 #define FRAME_BUF_SIZE  ((256*4*56)/8)
  60 #define frame_buf_offs 4
  61
  62 /* Supported VFD Types */
  63 #define VFD_TYPE_T119C          1       /* Noritake T119C VFD */
  64 #define VFD_TYPE_MN11236        2
  65
  66 /* taken from armboot/common/vfd.c */
  67 unsigned long adr_vfd_table[112][18][2][4][2];
  68 unsigned char bit_vfd_table[112][18][2][4][2];
  69
  70 /*
  71  * initialize the values for the VFD-grid-control in the framebuffer
  72  */
  73 void init_grid_ctrl(void)
  74 {
  75         DECLARE_GLOBAL_DATA_PTR;
  76         ulong adr, grid_cycle;
  77         unsigned int bit, display;
  78         unsigned char temp, bit_nr;
  79
  80         /*
  81          * clear frame buffer (logical clear => set to "black")
  82          */
  83         memset ((void *)(gd->fb_base),
  84                 gd->vfd_inv_data ? 0xFF : 0,
  85                 FRAME_BUF_SIZE);
  86
  87         switch (gd->vfd_type) {
  88         case VFD_TYPE_T119C:
  89             for (display=0; display<4; display++) {
  90                 for(grid_cycle=0; grid_cycle<56; grid_cycle++) {
  91                         bit = grid_cycle * 256  * 4 +
  92                              (grid_cycle + 200) * 4 +
  93                              frame_buf_offs + display;
  94                         /* wrap arround if offset (see manual S3C2400) */
  95                         if (bit>=FRAME_BUF_SIZE*8)
  96                                 bit = bit - (FRAME_BUF_SIZE * 8);
  97                         adr = gd->fb_base + (bit/32) * 4 + (3 - (bit%32) / 8);
  98                         bit_nr = bit % 8;
  99                         bit_nr = (bit_nr > 3) ? bit_nr-4 : bit_nr+4;
 100                         temp=(*(volatile unsigned char*)(adr));
 101                         if (gd->vfd_inv_data)
 102                                 temp &= ~(1<<bit_nr);
 103                         else
 104                                 temp |=  (1<<bit_nr);
 105                         (*(volatile unsigned char*)(adr))=temp;
 106
 107                         if(grid_cycle<55)
 108                                 bit = grid_cycle*256*4+(grid_cycle+201)*4+frame_buf_offs+display;
 109                         else
 110                                 bit = grid_cycle*256*4+200*4+frame_buf_offs+display-4;  /* grid nr. 0 */
 111                         /* wrap arround if offset (see manual S3C2400) */
 112                         if (bit>=FRAME_BUF_SIZE*8)
 113                                 bit = bit-(FRAME_BUF_SIZE*8);
 114                         adr = gd->fb_base+(bit/32)*4+(3-(bit%32)/8);
 115                         bit_nr = bit%8;
 116                         bit_nr = (bit_nr>3)?bit_nr-4:bit_nr+4;
 117                         temp=(*(volatile unsigned char*)(adr));
 118                         if (gd->vfd_inv_data)
 119                                 temp &= ~(1<<bit_nr);
 120                         else
 121                                 temp |=  (1<<bit_nr);
 122                         (*(volatile unsigned char*)(adr))=temp;
 123                 }
 124             }
 125             break;
 126         case VFD_TYPE_MN11236:
 127             for (display=0; display<4; display++) {
 128                 for (grid_cycle=0; grid_cycle<38; grid_cycle++) {
 129                         bit = grid_cycle * 256  * 4 +
 130                              (253 - grid_cycle) * 4 +
 131                              frame_buf_offs + display;
 132                         /* wrap arround if offset (see manual S3C2400) */
 133                         if (bit>=FRAME_BUF_SIZE*8)
 134                                 bit = bit - (FRAME_BUF_SIZE * 8);
 135                         adr = gd->fb_base + (bit/32) * 4 + (3 - (bit%32) / 8);
 136                         bit_nr = bit % 8;
 137                         bit_nr = (bit_nr > 3) ? bit_nr-4 : bit_nr+4;
 138                         temp=(*(volatile unsigned char*)(adr));
 139                         if (gd->vfd_inv_data)
 140                                 temp &= ~(1<<bit_nr);
 141                         else
 142                                 temp |=  (1<<bit_nr);
 143                         (*(volatile unsigned char*)(adr))=temp;
 144
 145                         if(grid_cycle<37)
 146                                 bit = grid_cycle*256*4+(252-grid_cycle)*4+frame_buf_offs+display;
 147
 148                         /* wrap arround if offset (see manual S3C2400) */
 149                         if (bit>=FRAME_BUF_SIZE*8)
 150                                 bit = bit-(FRAME_BUF_SIZE*8);
 151                         adr = gd->fb_base+(bit/32)*4+(3-(bit%32)/8);
 152                         bit_nr = bit%8;
 153                         bit_nr = (bit_nr>3)?bit_nr-4:bit_nr+4;
 154                         temp=(*(volatile unsigned char*)(adr));
 155                         if (gd->vfd_inv_data)
 156                                 temp &= ~(1<<bit_nr);
 157                         else
 158                                 temp |=  (1<<bit_nr);
 159                         (*(volatile unsigned char*)(adr))=temp;
 160                 }
 161             }
 162             break;
 163         default:
 164             printf ("Warning: unknown display type\n");
 165             break;
 166         }
 167 }
 168
 169 /*
 170  *create translation table for getting easy the right position in the
 171  *physical framebuffer for some x/y-coordinates of the VFDs
 172  */
 173 void create_vfd_table(void)
 174 {
 175         DECLARE_GLOBAL_DATA_PTR;
 176         unsigned long vfd_table[112][18][2][4][2];
 177         unsigned int x, y, color, display, entry, pixel;
 178         unsigned int x_abcdef = 0;
 179
 180         switch (gd->vfd_type) {
 181         case VFD_TYPE_T119C:
 182             for(y=0; y<=17; y++) {      /* Line */
 183                 for(x=0; x<=111; x++) { /* Column */
 184                     for(display=0; display <=3; display++) {
 185
 186                             /* Display 0 blue pixels */
 187                             vfd_table[x][y][0][display][0] =
 188                                 (x==0) ? y*16+display
 189                                        : (x%4)*4+y*16+((x-1)/2)*1024+display;
 190                             /* Display 0 red pixels */
 191                             vfd_table[x][y][1][display][0] =
 192                                 (x==0) ? y*16+512+display
 193                                        : (x%4)*4+y*16+((x-1)/2)*1024+512+display;
 194                     }
 195                 }
 196             }
 197             break;
 198         case VFD_TYPE_MN11236:
 199             for(y=0; y<=17; y++) {      /* Line */
 200                 for(x=0; x<=111; x++) { /* Column */
 201                     for(display=0; display <=3; display++) {
 202
 203                             vfd_table[x][y][0][display][0]=0;
 204                             vfd_table[x][y][0][display][1]=0;
 205                             vfd_table[x][y][1][display][0]=0;
 206                             vfd_table[x][y][1][display][1]=0;
 207
 208                             switch (x%6) {
 209                             case 0: x_abcdef=0; break; /* a -> a */
 210                             case 1: x_abcdef=2; break; /* b -> c */
 211                             case 2: x_abcdef=4; break; /* c -> e */
 212                             case 3: x_abcdef=5; break; /* d -> f */
 213                             case 4: x_abcdef=3; break; /* e -> d */
 214                             case 5: x_abcdef=1; break; /* f -> b */
 215                             }
 216
 217                             /* blue pixels */
 218                             vfd_table[x][y][0][display][0] =
 219                                 (x>1) ? x_abcdef*4+((x-1)/3)*1024+y*48+display
 220                                       : x_abcdef*4+             0+y*48+display;
 221                             /* blue pixels */
 222                             if (x>1 && (x-1)%3)
 223                                     vfd_table[x][y][0][display][1] = x_abcdef*4+((x-1)/3+1)*1024+y*48+display;
 224
 225                             /* red pixels */
 226                             vfd_table[x][y][1][display][0] =
 227                                 (x>1) ? x_abcdef*4+24+((x-1)/3)*1024+y*48+display
 228                                       : x_abcdef*4+24+             0+y*48+display;
 229                             /* red pixels */
 230                             if (x>1 && (x-1)%3)
 231                                     vfd_table[x][y][1][display][1] = x_abcdef*4+24+((x-1)/3+1)*1024+y*48+display;
 232                     }
 233                 }
 234             }
 235             break;
 236         default:
 237             /* do nothing */
 238             return;
 239         }
 240
 241         /*
 242          * Create table with entries for physical byte adresses and
 243          * bit-number within the byte
 244          * from table with bit-numbers within the total framebuffer
 245          */
 246         for(y=0;y<18;y++) {
 247             for(x=0;x<112;x++) {
 248                 for(color=0;color<2;color++) {
 249                     for(display=0;display<4;display++) {
 250                         for(entry=0;entry<2;entry++) {
 251                             unsigned long adr  = gd->fb_base;
 252                             unsigned int bit_nr = 0;
 253
 254                             if (vfd_table[x][y][color][display][entry]) {
 255
 256                                 pixel  = vfd_table[x][y][color][display][entry] + frame_buf_offs;
 257                                  /*
 258                                   * wrap arround if offset
 259                                   * (see manual S3C2400)
 260                                   */
 261                                 if (pixel>=FRAME_BUF_SIZE*8)
 262                                         pixel = pixel-(FRAME_BUF_SIZE*8);
 263                                 adr    = gd->fb_base+(pixel/32)*4+(3-(pixel%32)/8);
 264                                 bit_nr = pixel%8;
 265                                 bit_nr = (bit_nr>3)?bit_nr-4:bit_nr+4;
 266                             }
 267                             adr_vfd_table[x][y][color][display][entry] = adr;
 268                             bit_vfd_table[x][y][color][display][entry] = bit_nr;
 269                         }
 270                     }
 271                 }
 272             }
 273         }
 274 }
 275
 276 /*
 277  * Set/clear pixel of the VFDs
 278  */
 279 void set_vfd_pixel(unsigned char x, unsigned char y,
 280                    unsigned char color, unsigned char display,
 281                    unsigned char value)
 282 {
 283         DECLARE_GLOBAL_DATA_PTR;
 284         ulong adr;
 285         unsigned char bit_nr, temp;
 286
 287         if (! gd->vfd_type) {
 288                 /* Unknown type. */
 289                 return;
 290         }
 291
 292         /* Pixel-Eintrag Nr. 1 */
 293         adr = adr_vfd_table[x][y][color][display][0];
 294         /* Pixel-Eintrag Nr. 1 */
 295         bit_nr = bit_vfd_table[x][y][color][display][0];
 296         temp=(*(volatile unsigned char*)(adr));
 297
 298         if (gd->vfd_inv_data) {
 299                 if (value)
 300                         temp &= ~(1<<bit_nr);
 301                 else
 302                         temp |=  (1<<bit_nr);
 303         } else {
 304                 if (value)
 305                         temp |=  (1<<bit_nr);
 306                 else
 307                         temp &= ~(1<<bit_nr);
 308         }
 309
 310         (*(volatile unsigned char*)(adr))=temp;
 311 }
 312
 313 /*
 314  * transfer image from BMP-File
 315  */
 316 void transfer_pic(int display, unsigned char *adr, int height, int width)
 317 {
 318         int x, y;
 319         unsigned char temp;
 320
 321         for (; height > 0; height -= 18)
 322         {
 323                 if (height > 18)
 324                         y = 18;
 325                 else
 326                         y = height;
 327                 for (; y > 0; y--)
 328                 {
 329                         for (x = 0; x < width; x += 2)
 330                         {
 331                                 temp = *adr++;
 332                                 set_vfd_pixel(x, y-1, 0, display, 0);
 333                                 set_vfd_pixel(x, y-1, 1, display, 0);
 334                                 if ((temp >> 4) == BLAU)
 335                                         set_vfd_pixel(x, y-1, 0, display, 1);
 336                                 else if ((temp >> 4) == ROT)
 337                                         set_vfd_pixel(x, y-1, 1, display, 1);
 338                                 else if ((temp >> 4) == VIOLETT)
 339                                 {
 340                                         set_vfd_pixel(x, y-1, 0, display, 1);
 341                                         set_vfd_pixel(x, y-1, 1, display, 1);
 342                                 }
 343                                 set_vfd_pixel(x+1, y-1, 0, display, 0);
 344                                 set_vfd_pixel(x+1, y-1, 1, display, 0);
 345                                 if ((temp & 0x0F) == BLAU)
 346                                         set_vfd_pixel(x+1, y-1, 0, display, 1);
 347                                 else if ((temp & 0x0F) == ROT)
 348                                         set_vfd_pixel(x+1, y-1, 1, display, 1);
 349                                 else if ((temp & 0x0F) == VIOLETT)
 350                                 {
 351                                         set_vfd_pixel(x+1, y-1, 0, display, 1);
 352                                         set_vfd_pixel(x+1, y-1, 1, display, 1);
 353                                 }
 354                         }
 355                 }
 356                 display++;
 357                 if (display > 3)
 358                         display = 0;
 359         }
 360 }
 361
 362 /*
 363  * This function initializes VFD clock that is needed for the CPLD that
 364  * manages the keyboard.
 365  */
 366 int vfd_init_clocks(void)
 367 {
 368         /* Port-Pins als LCD-Ausgang */
 369         rPCCON =   (rPCCON & 0xFFFFFF00)| 0x000000AA;
 370         /* Port-Pins als LCD-Ausgang */
 371         rPDCON =   (rPDCON & 0xFFFFFF03)| 0x000000A8;
 372 #ifdef CFG_WITH_VFRAME
 373         /* mit VFRAME zum Messen */
 374         rPDCON =   (rPDCON & 0xFFFFFF00)| 0x000000AA;
 375 #endif
 376
 377         rLCDCON2 = 0x000DC000;
 378         rLCDCON3 = 0x0051000A;
 379         rLCDCON4 = 0x00000001;
 380         rLCDCON5 = 0x00000440;
 381         rLCDCON1 = 0x00000B75;
 382
 383         return 0;
 384 }
 385
 386 /*
 387  * initialize LCD-Controller of the S3C2400 for using VFDs
 388  *
 389  * VFD detection depends on the board revision:
 390  * starting from Rev. 200 a type code can be read from the data pins,
 391  * driven by some pull-up resistors; all earlier systems must be
 392  * manually configured. The type is set in the "vfd_type" environment
 393  * variable.
 394  */
 395 int drv_vfd_init(void)
 396 {
 397         char *tmp;
 398         ulong palette;
 399         static int vfd_init_done = 0;
 400         int vfd_id;
 401
 402         DECLARE_GLOBAL_DATA_PTR;
 403
 404         if (vfd_init_done != 0)
 405                 return (0);
 406         vfd_init_done = 1;
 407
 408         /* try to determine display type from the value
 409          * defined by pull-ups
 410          */
 411         rPCUP  = (rPCUP & 0xFFF0);      /* activate  GPC0...GPC3 pullups */
 412         rPCCON = (rPCCON & 0xFFFFFF00); /* configure GPC0...GPC3 as inputs */
 413         udelay(10);                     /* allow signals to settle */
 414
 415         vfd_id = (~rPCDAT) & 0x000F;    /* read GPC0...GPC3 port pins */
 416         debug("Detecting Revison of WA4-VFD: ID=0x%X\n", vfd_id);
 417
 418         switch (vfd_id) {
 419         case 0:                 /* board revision < Rev.200 */
 420                 if ((tmp = getenv ("vfd_type")) == NULL) {
 421                         break;
 422                 }
 423                 if (strcmp(tmp, "T119C") == 0) {
 424                         gd->vfd_type = VFD_TYPE_T119C;
 425                 } else if (strcmp(tmp, "MN11236") == 0) {
 426                         gd->vfd_type = VFD_TYPE_MN11236;
 427                 } else {
 428                         /* cannot use printf for a warning here */
 429                         gd->vfd_type = 0;       /* unknown */
 430                 }
 431                 gd->vfd_inv_data = 0;
 432
 433                 break;
 434         default:                /* default to MN11236, data inverted */
 435                 gd->vfd_type = VFD_TYPE_MN11236;
 436                 gd->vfd_inv_data = 1;
 437                 setenv ("vfd_type", "MN11236");
 438         }
 439         debug ("VFD type: %s%s\n",
 440                 (gd->vfd_type == VFD_TYPE_T119C)   ? "T119C" :
 441                 (gd->vfd_type == VFD_TYPE_MN11236) ? "MN11236" :
 442                 "unknown",
 443                 gd->vfd_inv_data ? ", inverted data" : "");
 444
 445         gd->fb_base = gd->fb_base;
 446         create_vfd_table();
 447         init_grid_ctrl();
 448
 449         for (palette=0; palette < 16; palette++)
 450                 (*(volatile unsigned int*)(PALETTE+(palette*4)))=palette;
 451         for (palette=16; palette < 256; palette++)
 452                 (*(volatile unsigned int*)(PALETTE+(palette*4)))=0x00;
 453
 454         /*
 455          * Hinweis: Der Framebuffer ist um genau ein Nibble verschoben
 456          * Das erste angezeigte Pixel wird aus dem zweiten Nibble geholt
 457          * das letzte angezeigte Pixel wird aus dem ersten Nibble geholt
 458          * (wrap around)
 459          * see manual S3C2400
 460          */
 461         /* frame buffer startadr */
 462         rLCDSADDR1 = gd->fb_base >> 1;
 463         /* frame buffer endadr */
 464         rLCDSADDR2 = (gd->fb_base + FRAME_BUF_SIZE) >> 1;
 465         rLCDSADDR3 = ((256/4));
 466
 467         debug ("LCDSADDR1: %lX\n", rLCDSADDR1);
 468         debug ("LCDSADDR2: %lX\n", rLCDSADDR2);
 469         debug ("LCDSADDR3: %lX\n", rLCDSADDR3);
 470
 471         return 0;
 472 }
 473
 474 /************************************************************************/
 475 /* ** ROM capable initialization part - needed to reserve FB memory     */
 476 /************************************************************************/
 477
 478 /*
 479  * This is called early in the system initialization to grab memory
 480  * for the VFD controller.
 481  *
 482  * Note that this is running from ROM, so no write access to global data.
 483  */
 484 ulong vfd_setmem (ulong addr)
 485 {
 486         ulong size;
 487
 488         /* Round up to nearest full page */
 489         size = (FRAME_BUF_SIZE + (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
 490
 491         debug ("Reserving %ldk for VFD Framebuffer at: %08lx\n", size>>10, addr);
 492
 493         return (size);
 494 }
 495
 496 #endif /* CONFIG_VFD */