board/compulab/common/omap3_display.c

   1 /*
   2  * (C) Copyright 2012 - 2013 CompuLab, Ltd. <www.compulab.co.il>
   3  *
   4  * Authors: Nikita Kiryanov <nikita@compulab.co.il>
   5  *
   6  * Parsing code based on linux/drivers/video/pxafb.c
   7  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 #include <common.h>
  12 #include <asm/gpio.h>
  13 #include <asm/io.h>
  14 #include <stdio_dev.h>
  15 #include <asm/arch/dss.h>
  16 #include <lcd.h>
  17 #include <scf0403_lcd.h>
  18 #include <asm/arch-omap3/dss.h>
  19
  20 DECLARE_GLOBAL_DATA_PTR;
  21
  22 enum display_type {
  23         NONE,
  24         DVI,
  25         DVI_CUSTOM,
  26         DATA_IMAGE, /* #define CONFIG_SCF0403_LCD to use */
  27 };
  28
  29 #define CMAP_ADDR       0x80100000
  30
  31 /*
  32  * The frame buffer is allocated before we have the chance to parse user input.
  33  * To make sure enough memory is allocated for all resolutions, we define
  34  * vl_{col | row} to the maximal resolution supported by OMAP3.
  35  */
  36 vidinfo_t panel_info = {
  37         .vl_col  = 1400,
  38         .vl_row  = 1050,
  39         .vl_bpix = LCD_BPP,
  40         .cmap = (ushort *)CMAP_ADDR,
  41 };
  42
  43 static struct panel_config panel_cfg;
  44 static enum display_type lcd_def;
  45
  46 /*
  47  * A note on DVI presets;
  48  * U-Boot can convert 8 bit BMP data to 16 bit BMP data, and OMAP DSS can
  49  * convert 16 bit data into 24 bit data. Thus, GFXFORMAT_RGB16 allows us to
  50  * support two BMP types with one setting.
  51  */
  52 static const struct panel_config preset_dvi_640X480 = {
  53         .lcd_size       = PANEL_LCD_SIZE(640, 480),
  54         .timing_h       = DSS_HBP(48) | DSS_HFP(16) | DSS_HSW(96),
  55         .timing_v       = DSS_VBP(33) | DSS_VFP(10) | DSS_VSW(2),
  56         .pol_freq       = DSS_IHS | DSS_IVS | DSS_IPC,
  57         .divisor        = 12 | (1 << 16),
  58         .data_lines     = LCD_INTERFACE_24_BIT,
  59         .panel_type     = ACTIVE_DISPLAY,
  60         .load_mode      = 2,
  61         .gfx_format     = GFXFORMAT_RGB16,
  62 };
  63
  64 static const struct panel_config preset_dvi_800X600 = {
  65         .lcd_size       = PANEL_LCD_SIZE(800, 600),
  66         .timing_h       = DSS_HBP(88) | DSS_HFP(40) | DSS_HSW(128),
  67         .timing_v       = DSS_VBP(23) | DSS_VFP(1) | DSS_VSW(4),
  68         .pol_freq       = DSS_IHS | DSS_IVS | DSS_IPC,
  69         .divisor        = 8 | (1 << 16),
  70         .data_lines     = LCD_INTERFACE_24_BIT,
  71         .panel_type     = ACTIVE_DISPLAY,
  72         .load_mode      = 2,
  73         .gfx_format     = GFXFORMAT_RGB16,
  74 };
  75
  76 static const struct panel_config preset_dvi_1024X768 = {
  77         .lcd_size       = PANEL_LCD_SIZE(1024, 768),
  78         .timing_h       = DSS_HBP(160) | DSS_HFP(24) | DSS_HSW(136),
  79         .timing_v       = DSS_VBP(29) | DSS_VFP(3) | DSS_VSW(6),
  80         .pol_freq       = DSS_IHS | DSS_IVS | DSS_IPC,
  81         .divisor        = 5 | (1 << 16),
  82         .data_lines     = LCD_INTERFACE_24_BIT,
  83         .panel_type     = ACTIVE_DISPLAY,
  84         .load_mode      = 2,
  85         .gfx_format     = GFXFORMAT_RGB16,
  86 };
  87
  88 static const struct panel_config preset_dvi_1152X864 = {
  89         .lcd_size       = PANEL_LCD_SIZE(1152, 864),
  90         .timing_h       = DSS_HBP(256) | DSS_HFP(64) | DSS_HSW(128),
  91         .timing_v       = DSS_VBP(32) | DSS_VFP(1) | DSS_VSW(3),
  92         .pol_freq       = DSS_IHS | DSS_IVS | DSS_IPC,
  93         .divisor        = 4 | (1 << 16),
  94         .data_lines     = LCD_INTERFACE_24_BIT,
  95         .panel_type     = ACTIVE_DISPLAY,
  96         .load_mode      = 2,
  97         .gfx_format     = GFXFORMAT_RGB16,
  98 };
  99
 100 static const struct panel_config preset_dvi_1280X960 = {
 101         .lcd_size       = PANEL_LCD_SIZE(1280, 960),
 102         .timing_h       = DSS_HBP(312) | DSS_HFP(96) | DSS_HSW(112),
 103         .timing_v       = DSS_VBP(36) | DSS_VFP(1) | DSS_VSW(3),
 104         .pol_freq       = DSS_IHS | DSS_IVS | DSS_IPC,
 105         .divisor        = 3 | (1 << 16),
 106         .data_lines     = LCD_INTERFACE_24_BIT,
 107         .panel_type     = ACTIVE_DISPLAY,
 108         .load_mode      = 2,
 109         .gfx_format     = GFXFORMAT_RGB16,
 110 };
 111
 112 static const struct panel_config preset_dvi_1280X1024 = {
 113         .lcd_size       = PANEL_LCD_SIZE(1280, 1024),
 114         .timing_h       = DSS_HBP(248) | DSS_HFP(48) | DSS_HSW(112),
 115         .timing_v       = DSS_VBP(38) | DSS_VFP(1) | DSS_VSW(3),
 116         .pol_freq       = DSS_IHS | DSS_IVS | DSS_IPC,
 117         .divisor        = 3 | (1 << 16),
 118         .data_lines     = LCD_INTERFACE_24_BIT,
 119         .panel_type     = ACTIVE_DISPLAY,
 120         .load_mode      = 2,
 121         .gfx_format     = GFXFORMAT_RGB16,
 122 };
 123
 124 static const struct panel_config preset_dataimage_480X800 = {
 125         .lcd_size       = PANEL_LCD_SIZE(480, 800),
 126         .timing_h       = DSS_HBP(2) | DSS_HFP(2) | DSS_HSW(2),
 127         .timing_v       = DSS_VBP(17) | DSS_VFP(20) | DSS_VSW(3),
 128         .pol_freq       = DSS_IVS | DSS_IHS | DSS_IPC | DSS_ONOFF,
 129         .divisor        = 10 | (1 << 10),
 130         .data_lines     = LCD_INTERFACE_18_BIT,
 131         .panel_type     = ACTIVE_DISPLAY,
 132         .load_mode      = 2,
 133         .gfx_format     = GFXFORMAT_RGB16,
 134 };
 135
 136 /*
 137  * set_resolution_params()
 138  *
 139  * Due to usage of multiple display related APIs resolution data is located in
 140  * more than one place. This function updates them all.
 141  */
 142 static void set_resolution_params(int x, int y)
 143 {
 144         panel_cfg.lcd_size = PANEL_LCD_SIZE(x, y);
 145         panel_info.vl_col = x;
 146         panel_info.vl_row = y;
 147         lcd_line_length = (panel_info.vl_col * NBITS(panel_info.vl_bpix)) / 8;
 148 }
 149
 150 static void set_preset(const struct panel_config preset, int x_res, int y_res)
 151 {
 152         panel_cfg = preset;
 153         set_resolution_params(x_res, y_res);
 154 }
 155
 156 static enum display_type set_dvi_preset(const struct panel_config preset,
 157                                         int x_res, int y_res)
 158 {
 159         set_preset(preset, x_res, y_res);
 160         return DVI;
 161 }
 162
 163 static enum display_type set_dataimage_preset(const struct panel_config preset,
 164                 int x_res, int y_res)
 165 {
 166         set_preset(preset, x_res, y_res);
 167         return DATA_IMAGE;
 168 }
 169
 170 /*
 171  * parse_mode() - parse the mode parameter of custom lcd settings
 172  *
 173  * @mode:       <res_x>x<res_y>
 174  *
 175  * Returns -1 on error, 0 on success.
 176  */
 177 static int parse_mode(const char *mode)
 178 {
 179         unsigned int modelen = strlen(mode);
 180         int res_specified = 0;
 181         unsigned int xres = 0, yres = 0;
 182         int yres_specified = 0;
 183         int i;
 184
 185         for (i = modelen - 1; i >= 0; i--) {
 186                 switch (mode[i]) {
 187                 case 'x':
 188                         if (!yres_specified) {
 189                                 yres = simple_strtoul(&mode[i + 1], NULL, 0);
 190                                 yres_specified = 1;
 191                         } else {
 192                                 goto done_parsing;
 193                         }
 194
 195                         break;
 196                 case '0' ... '9':
 197                         break;
 198                 default:
 199                         goto done_parsing;
 200                 }
 201         }
 202
 203         if (i < 0 && yres_specified) {
 204                 xres = simple_strtoul(mode, NULL, 0);
 205                 res_specified = 1;
 206         }
 207
 208 done_parsing:
 209         if (res_specified) {
 210                 set_resolution_params(xres, yres);
 211         } else {
 212                 printf("LCD: invalid mode: %s\n", mode);
 213                 return -1;
 214         }
 215
 216         return 0;
 217 }
 218
 219 #define PIXEL_CLK_NUMERATOR (26 * 432 / 39)
 220 /*
 221  * parse_pixclock() - Parse the pixclock parameter of custom lcd settings
 222  *
 223  * @pixclock:   the desired pixel clock
 224  *
 225  * Returns -1 on error, 0 on success.
 226  *
 227  * Handling the pixel_clock:
 228  *
 229  * Pixel clock is defined in the OMAP35x TRM as follows:
 230  * pixel_clock =
 231  * (SYS_CLK * 2 * PRCM.CM_CLKSEL2_PLL[18:8]) /
 232  * (DSS.DISPC_DIVISOR[23:16] * DSS.DISPC_DIVISOR[6:0] *
 233  * PRCM.CM_CLKSEL_DSS[4:0] * (PRCM.CM_CLKSEL2_PLL[6:0] + 1))
 234  *
 235  * In practice, this means that in order to set the
 236  * divisor for the desired pixel clock one needs to
 237  * solve the following equation:
 238  *
 239  * 26 * 432 / (39 * <pixel_clock>) = DSS.DISPC_DIVISOR[6:0]
 240  *
 241  * NOTE: the explicit equation above is reduced. Do not
 242  * try to infer anything from these numbers.
 243  */
 244 static int parse_pixclock(char *pixclock)
 245 {
 246         int divisor, pixclock_val;
 247         char *pixclk_start = pixclock;
 248
 249         pixclock_val = simple_strtoul(pixclock, &pixclock, 10);
 250         divisor = DIV_ROUND_UP(PIXEL_CLK_NUMERATOR, pixclock_val);
 251         /* 0 and 1 are illegal values for PCD */
 252         if (divisor <= 1)
 253                 divisor = 2;
 254
 255         panel_cfg.divisor = divisor | (1 << 16);
 256         if (pixclock[0] != '\0') {
 257                 printf("LCD: invalid value for pixclock:%s\n", pixclk_start);
 258                 return -1;
 259         }
 260
 261         return 0;
 262 }
 263
 264 /*
 265  * parse_setting() - parse a single setting of custom lcd parameters
 266  *
 267  * @setting:    The custom lcd setting <name>:<value>
 268  *
 269  * Returns -1 on failure, 0 on success.
 270  */
 271 static int parse_setting(char *setting)
 272 {
 273         int num_val;
 274         char *setting_start = setting;
 275
 276         if (!strncmp(setting, "mode:", 5)) {
 277                 return parse_mode(setting + 5);
 278         } else if (!strncmp(setting, "pixclock:", 9)) {
 279                 return parse_pixclock(setting + 9);
 280         } else if (!strncmp(setting, "left:", 5)) {
 281                 num_val = simple_strtoul(setting + 5, &setting, 0);
 282                 panel_cfg.timing_h |= DSS_HBP(num_val);
 283         } else if (!strncmp(setting, "right:", 6)) {
 284                 num_val = simple_strtoul(setting + 6, &setting, 0);
 285                 panel_cfg.timing_h |= DSS_HFP(num_val);
 286         } else if (!strncmp(setting, "upper:", 6)) {
 287                 num_val = simple_strtoul(setting + 6, &setting, 0);
 288                 panel_cfg.timing_v |= DSS_VBP(num_val);
 289         } else if (!strncmp(setting, "lower:", 6)) {
 290                 num_val = simple_strtoul(setting + 6, &setting, 0);
 291                 panel_cfg.timing_v |= DSS_VFP(num_val);
 292         } else if (!strncmp(setting, "hsynclen:", 9)) {
 293                 num_val = simple_strtoul(setting + 9, &setting, 0);
 294                 panel_cfg.timing_h |= DSS_HSW(num_val);
 295         } else if (!strncmp(setting, "vsynclen:", 9)) {
 296                 num_val = simple_strtoul(setting + 9, &setting, 0);
 297                 panel_cfg.timing_v |= DSS_VSW(num_val);
 298         } else if (!strncmp(setting, "hsync:", 6)) {
 299                 if (simple_strtoul(setting + 6, &setting, 0) == 0)
 300                         panel_cfg.pol_freq |= DSS_IHS;
 301                 else
 302                         panel_cfg.pol_freq &= ~DSS_IHS;
 303         } else if (!strncmp(setting, "vsync:", 6)) {
 304                 if (simple_strtoul(setting + 6, &setting, 0) == 0)
 305                         panel_cfg.pol_freq |= DSS_IVS;
 306                 else
 307                         panel_cfg.pol_freq &= ~DSS_IVS;
 308         } else if (!strncmp(setting, "outputen:", 9)) {
 309                 if (simple_strtoul(setting + 9, &setting, 0) == 0)
 310                         panel_cfg.pol_freq |= DSS_IEO;
 311                 else
 312                         panel_cfg.pol_freq &= ~DSS_IEO;
 313         } else if (!strncmp(setting, "pixclockpol:", 12)) {
 314                 if (simple_strtoul(setting + 12, &setting, 0) == 0)
 315                         panel_cfg.pol_freq |= DSS_IPC;
 316                 else
 317                         panel_cfg.pol_freq &= ~DSS_IPC;
 318         } else if (!strncmp(setting, "active", 6)) {
 319                 panel_cfg.panel_type = ACTIVE_DISPLAY;
 320                 return 0; /* Avoid sanity check below */
 321         } else if (!strncmp(setting, "passive", 7)) {
 322                 panel_cfg.panel_type = PASSIVE_DISPLAY;
 323                 return 0; /* Avoid sanity check below */
 324         } else if (!strncmp(setting, "display:", 8)) {
 325                 if (!strncmp(setting + 8, "dvi", 3)) {
 326                         lcd_def = DVI_CUSTOM;
 327                         return 0; /* Avoid sanity check below */
 328                 }
 329         } else {
 330                 printf("LCD: unknown option %s\n", setting_start);
 331                 return -1;
 332         }
 333
 334         if (setting[0] != '\0') {
 335                 printf("LCD: invalid value for %s\n", setting_start);
 336                 return -1;
 337         }
 338
 339         return 0;
 340 }
 341
 342 /*
 343  * env_parse_customlcd() - parse custom lcd params from an environment variable.
 344  *
 345  * @custom_lcd_params:  The environment variable containing the lcd params.
 346  *
 347  * Returns -1 on failure, 0 on success.
 348  */
 349 static int parse_customlcd(char *custom_lcd_params)
 350 {
 351         char params_cpy[160];
 352         char *setting;
 353
 354         strncpy(params_cpy, custom_lcd_params, 160);
 355         setting = strtok(params_cpy, ",");
 356         while (setting) {
 357                 if (parse_setting(setting) < 0)
 358                         return -1;
 359
 360                 setting = strtok(NULL, ",");
 361         }
 362
 363         /* Currently we don't support changing this via custom lcd params */
 364         panel_cfg.data_lines = LCD_INTERFACE_24_BIT;
 365         panel_cfg.gfx_format = GFXFORMAT_RGB16; /* See dvi predefines note */
 366
 367         return 0;
 368 }
 369
 370 /*
 371  * env_parse_displaytype() - parse display type.
 372  *
 373  * Parses the environment variable "displaytype", which contains the
 374  * name of the display type or preset, in which case it applies its
 375  * configurations.
 376  *
 377  * Returns the type of display that was specified.
 378  */
 379 static enum display_type env_parse_displaytype(char *displaytype)
 380 {
 381         if (!strncmp(displaytype, "dvi640x480", 10))
 382                 return set_dvi_preset(preset_dvi_640X480, 640, 480);
 383         else if (!strncmp(displaytype, "dvi800x600", 10))
 384                 return set_dvi_preset(preset_dvi_800X600, 800, 600);
 385         else if (!strncmp(displaytype, "dvi1024x768", 11))
 386                 return set_dvi_preset(preset_dvi_1024X768, 1024, 768);
 387         else if (!strncmp(displaytype, "dvi1152x864", 11))
 388                 return set_dvi_preset(preset_dvi_1152X864, 1152, 864);
 389         else if (!strncmp(displaytype, "dvi1280x960", 11))
 390                 return set_dvi_preset(preset_dvi_1280X960, 1280, 960);
 391         else if (!strncmp(displaytype, "dvi1280x1024", 12))
 392                 return set_dvi_preset(preset_dvi_1280X1024, 1280, 1024);
 393         else if (!strncmp(displaytype, "dataimage480x800", 16))
 394                 return set_dataimage_preset(preset_dataimage_480X800, 480, 800);
 395
 396         return NONE;
 397 }
 398
 399 void lcd_ctrl_init(void *lcdbase)
 400 {
 401         struct prcm *prcm = (struct prcm *)PRCM_BASE;
 402         char *custom_lcd;
 403         char *displaytype = getenv("displaytype");
 404
 405         if (displaytype == NULL)
 406                 return;
 407
 408         lcd_def = env_parse_displaytype(displaytype);
 409         /* If we did not recognize the preset, check if it's an env variable */
 410         if (lcd_def == NONE) {
 411                 custom_lcd = getenv(displaytype);
 412                 if (custom_lcd == NULL || parse_customlcd(custom_lcd) < 0)
 413                         return;
 414         }
 415
 416         panel_cfg.frame_buffer = lcdbase;
 417         omap3_dss_panel_config(&panel_cfg);
 418         /*
 419          * Pixel clock is defined with many divisions and only few
 420          * multiplications of the system clock. Since DSS FCLK divisor is set
 421          * to 16 by default, we need to set it to a smaller value, like 3
 422          * (chosen via trial and error).
 423          */
 424         clrsetbits_le32(&prcm->clksel_dss, 0xF, 3);
 425 }
 426
 427 #ifdef CONFIG_SCF0403_LCD
 428 static void scf0403_enable(void)
 429 {
 430         gpio_direction_output(58, 1);
 431         scf0403_init(157);
 432 }
 433 #else
 434 static inline void scf0403_enable(void) {}
 435 #endif
 436
 437 void lcd_enable(void)
 438 {
 439         switch (lcd_def) {
 440         case NONE:
 441                 return;
 442         case DVI:
 443         case DVI_CUSTOM:
 444                 gpio_direction_output(54, 0); /* Turn on DVI */
 445                 break;
 446         case DATA_IMAGE:
 447                 scf0403_enable();
 448                 break;
 449         }
 450
 451         omap3_dss_enable();
 452 }
 453
 454 void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue) {}