1 /* 2 * Copyright (c) 2011 The Chromium OS Authors. 3 * See file CREDITS for list of people who contributed to this 4 * project. 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation; either version 2 of 9 * the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 19 * MA 02111-1307 USA 20 */ 21 22 #include <common.h> 23 #include <fdtdec.h> 24 #include <lcd.h> 25 26 #include <asm/system.h> 27 #include <asm/gpio.h> 28 29 #include <asm/arch/clock.h> 30 #include <asm/arch/funcmux.h> 31 #include <asm/arch/pinmux.h> 32 #include <asm/arch/pwm.h> 33 #include <asm/arch/display.h> 34 #include <asm/arch-tegra/timer.h> 35 36 DECLARE_GLOBAL_DATA_PTR; 37 38 /* These are the stages we go throuh in enabling the LCD */ 39 enum stage_t { 40 STAGE_START, 41 STAGE_PANEL_VDD, 42 STAGE_LVDS, 43 STAGE_BACKLIGHT_VDD, 44 STAGE_PWM, 45 STAGE_BACKLIGHT_EN, 46 STAGE_DONE, 47 }; 48 49 static enum stage_t stage; /* Current stage we are at */ 50 static unsigned long timer_next; /* Time we can move onto next stage */ 51 52 /* Our LCD config, set up in handle_stage() */ 53 static struct fdt_panel_config config; 54 struct fdt_disp_config *disp_config; /* Display controller config */ 55 56 enum { 57 /* Maximum LCD size we support */ 58 LCD_MAX_WIDTH = 1366, 59 LCD_MAX_HEIGHT = 768, 60 LCD_MAX_LOG2_BPP = 4, /* 2^4 = 16 bpp */ 61 }; 62 63 int lcd_line_length; 64 int lcd_color_fg; 65 int lcd_color_bg; 66 67 void *lcd_base; /* Start of framebuffer memory */ 68 void *lcd_console_address; /* Start of console buffer */ 69 70 short console_col; 71 short console_row; 72 73 vidinfo_t panel_info = { 74 /* Insert a value here so that we don't end up in the BSS */ 75 .vl_col = -1, 76 }; 77 78 char lcd_cursor_enabled; 79 80 ushort lcd_cursor_width; 81 ushort lcd_cursor_height; 82 83 #ifndef CONFIG_OF_CONTROL 84 #error "You must enable CONFIG_OF_CONTROL to get Tegra LCD support" 85 #endif 86 87 void lcd_cursor_size(ushort width, ushort height) 88 { 89 lcd_cursor_width = width; 90 lcd_cursor_height = height; 91 } 92 93 void lcd_toggle_cursor(void) 94 { 95 ushort x, y; 96 uchar *dest; 97 ushort row; 98 99 x = console_col * lcd_cursor_width; 100 y = console_row * lcd_cursor_height; 101 dest = (uchar *)(lcd_base + y * lcd_line_length + x * (1 << LCD_BPP) / 102 8); 103 104 for (row = 0; row < lcd_cursor_height; ++row, dest += lcd_line_length) { 105 ushort *d = (ushort *)dest; 106 ushort color; 107 int i; 108 109 for (i = 0; i < lcd_cursor_width; ++i) { 110 color = *d; 111 color ^= lcd_color_fg; 112 *d = color; 113 ++d; 114 } 115 } 116 } 117 118 void lcd_cursor_on(void) 119 { 120 lcd_cursor_enabled = 1; 121 lcd_toggle_cursor(); 122 } 123 void lcd_cursor_off(void) 124 { 125 lcd_cursor_enabled = 0; 126 lcd_toggle_cursor(); 127 } 128 129 char lcd_is_cursor_enabled(void) 130 { 131 return lcd_cursor_enabled; 132 } 133 134 static void update_panel_size(struct fdt_disp_config *config) 135 { 136 panel_info.vl_col = config->width; 137 panel_info.vl_row = config->height; 138 panel_info.vl_bpix = config->log2_bpp; 139 } 140 141 /* 142 * Main init function called by lcd driver. 143 * Inits and then prints test pattern if required. 144 */ 145 146 void lcd_ctrl_init(void *lcdbase) 147 { 148 int line_length, size; 149 int type = DCACHE_OFF; 150 151 assert(disp_config); 152 153 lcd_base = (void *)disp_config->frame_buffer; 154 155 /* Make sure that we can acommodate the selected LCD */ 156 assert(disp_config->width <= LCD_MAX_WIDTH); 157 assert(disp_config->height <= LCD_MAX_HEIGHT); 158 assert(disp_config->log2_bpp <= LCD_MAX_LOG2_BPP); 159 if (disp_config->width <= LCD_MAX_WIDTH 160 && disp_config->height <= LCD_MAX_HEIGHT 161 && disp_config->log2_bpp <= LCD_MAX_LOG2_BPP) 162 update_panel_size(disp_config); 163 size = lcd_get_size(&line_length); 164 165 /* Set up the LCD caching as requested */ 166 if (config.cache_type & FDT_LCD_CACHE_WRITE_THROUGH) 167 type = DCACHE_WRITETHROUGH; 168 else if (config.cache_type & FDT_LCD_CACHE_WRITE_BACK) 169 type = DCACHE_WRITEBACK; 170 mmu_set_region_dcache_behaviour(disp_config->frame_buffer, size, type); 171 172 /* Enable flushing after LCD writes if requested */ 173 lcd_set_flush_dcache(config.cache_type & FDT_LCD_CACHE_FLUSH); 174 175 debug("LCD frame buffer at %p\n", lcd_base); 176 } 177 178 ulong calc_fbsize(void) 179 { 180 return (panel_info.vl_col * panel_info.vl_row * 181 NBITS(panel_info.vl_bpix)) / 8; 182 } 183 184 void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue) 185 { 186 } 187 188 void tegra_lcd_early_init(const void *blob) 189 { 190 /* 191 * Go with the maximum size for now. We will fix this up after 192 * relocation. These values are only used for memory alocation. 193 */ 194 panel_info.vl_col = LCD_MAX_WIDTH; 195 panel_info.vl_row = LCD_MAX_HEIGHT; 196 panel_info.vl_bpix = LCD_MAX_LOG2_BPP; 197 } 198 199 /** 200 * Decode the panel information from the fdt. 201 * 202 * @param blob fdt blob 203 * @param config structure to store fdt config into 204 * @return 0 if ok, -ve on error 205 */ 206 static int fdt_decode_lcd(const void *blob, struct fdt_panel_config *config) 207 { 208 int display_node; 209 210 disp_config = tegra_display_get_config(); 211 if (!disp_config) { 212 debug("%s: Display controller is not configured\n", __func__); 213 return -1; 214 } 215 display_node = disp_config->panel_node; 216 if (display_node < 0) { 217 debug("%s: No panel configuration available\n", __func__); 218 return -1; 219 } 220 221 config->pwm_channel = pwm_request(blob, display_node, "nvidia,pwm"); 222 if (config->pwm_channel < 0) { 223 debug("%s: Unable to request PWM channel\n", __func__); 224 return -1; 225 } 226 227 config->cache_type = fdtdec_get_int(blob, display_node, 228 "nvidia,cache-type", 229 FDT_LCD_CACHE_WRITE_BACK_FLUSH); 230 231 /* These GPIOs are all optional */ 232 fdtdec_decode_gpio(blob, display_node, "nvidia,backlight-enable-gpios", 233 &config->backlight_en); 234 fdtdec_decode_gpio(blob, display_node, "nvidia,lvds-shutdown-gpios", 235 &config->lvds_shutdown); 236 fdtdec_decode_gpio(blob, display_node, "nvidia,backlight-vdd-gpios", 237 &config->backlight_vdd); 238 fdtdec_decode_gpio(blob, display_node, "nvidia,panel-vdd-gpios", 239 &config->panel_vdd); 240 241 return fdtdec_get_int_array(blob, display_node, "nvidia,panel-timings", 242 config->panel_timings, FDT_LCD_TIMINGS); 243 } 244 245 /** 246 * Handle the next stage of device init 247 */ 248 static int handle_stage(const void *blob) 249 { 250 debug("%s: stage %d\n", __func__, stage); 251 252 /* do the things for this stage */ 253 switch (stage) { 254 case STAGE_START: 255 /* Initialize the Tegra display controller */ 256 if (tegra_display_probe(gd->fdt_blob, (void *)gd->fb_base)) { 257 printf("%s: Failed to probe display driver\n", 258 __func__); 259 return -1; 260 } 261 262 /* get panel details */ 263 if (fdt_decode_lcd(blob, &config)) { 264 printf("No valid LCD information in device tree\n"); 265 return -1; 266 } 267 268 /* 269 * It is possible that the FDT has requested that the LCD be 270 * disabled. We currently don't support this. It would require 271 * changes to U-Boot LCD subsystem to have LCD support 272 * compiled in but not used. An easier option might be to 273 * still have a frame buffer, but leave the backlight off and 274 * remove all mention of lcd in the stdout environment 275 * variable. 276 */ 277 278 funcmux_select(PERIPH_ID_DISP1, FUNCMUX_DEFAULT); 279 280 fdtdec_setup_gpio(&config.panel_vdd); 281 fdtdec_setup_gpio(&config.lvds_shutdown); 282 fdtdec_setup_gpio(&config.backlight_vdd); 283 fdtdec_setup_gpio(&config.backlight_en); 284 285 /* 286 * TODO: If fdt includes output flag we can omit this code 287 * since fdtdec_setup_gpio will do it for us. 288 */ 289 if (fdt_gpio_isvalid(&config.panel_vdd)) 290 gpio_direction_output(config.panel_vdd.gpio, 0); 291 if (fdt_gpio_isvalid(&config.lvds_shutdown)) 292 gpio_direction_output(config.lvds_shutdown.gpio, 0); 293 if (fdt_gpio_isvalid(&config.backlight_vdd)) 294 gpio_direction_output(config.backlight_vdd.gpio, 0); 295 if (fdt_gpio_isvalid(&config.backlight_en)) 296 gpio_direction_output(config.backlight_en.gpio, 0); 297 break; 298 case STAGE_PANEL_VDD: 299 if (fdt_gpio_isvalid(&config.panel_vdd)) 300 gpio_direction_output(config.panel_vdd.gpio, 1); 301 break; 302 case STAGE_LVDS: 303 if (fdt_gpio_isvalid(&config.lvds_shutdown)) 304 gpio_set_value(config.lvds_shutdown.gpio, 1); 305 break; 306 case STAGE_BACKLIGHT_VDD: 307 if (fdt_gpio_isvalid(&config.backlight_vdd)) 308 gpio_set_value(config.backlight_vdd.gpio, 1); 309 break; 310 case STAGE_PWM: 311 /* Enable PWM at 15/16 high, 32768 Hz with divider 1 */ 312 pinmux_set_func(PINGRP_GPU, PMUX_FUNC_PWM); 313 pinmux_tristate_disable(PINGRP_GPU); 314 315 pwm_enable(config.pwm_channel, 32768, 0xdf, 1); 316 break; 317 case STAGE_BACKLIGHT_EN: 318 if (fdt_gpio_isvalid(&config.backlight_en)) 319 gpio_set_value(config.backlight_en.gpio, 1); 320 break; 321 case STAGE_DONE: 322 break; 323 } 324 325 /* set up timer for next stage */ 326 timer_next = timer_get_us(); 327 if (stage < FDT_LCD_TIMINGS) 328 timer_next += config.panel_timings[stage] * 1000; 329 330 /* move to next stage */ 331 stage++; 332 return 0; 333 } 334 335 int tegra_lcd_check_next_stage(const void *blob, int wait) 336 { 337 if (stage == STAGE_DONE) 338 return 0; 339 340 do { 341 /* wait if we need to */ 342 debug("%s: stage %d\n", __func__, stage); 343 if (stage != STAGE_START) { 344 int delay = timer_next - timer_get_us(); 345 346 if (delay > 0) { 347 if (wait) 348 udelay(delay); 349 else 350 return 0; 351 } 352 } 353 354 if (handle_stage(blob)) 355 return -1; 356 } while (wait && stage != STAGE_DONE); 357 if (stage == STAGE_DONE) 358 debug("%s: LCD init complete\n", __func__); 359 360 return 0; 361 } 362 363 void lcd_enable(void) 364 { 365 /* 366 * Backlight and power init will be done separately in 367 * tegra_lcd_check_next_stage(), which should be called in 368 * board_late_init(). 369 * 370 * U-Boot code supports only colour depth, selected at compile time. 371 * The device tree setting should match this. Otherwise the display 372 * will not look right, and U-Boot may crash. 373 */ 374 if (disp_config->log2_bpp != LCD_BPP) { 375 printf("%s: Error: LCD depth configured in FDT (%d = %dbpp)" 376 " must match setting of LCD_BPP (%d)\n", __func__, 377 disp_config->log2_bpp, disp_config->bpp, LCD_BPP); 378 } 379 } 380