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