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 65 void *lcd_base; /* Start of framebuffer memory */ 66 void *lcd_console_address; /* Start of console buffer */ 67 68 short console_col; 69 short console_row; 70 71 vidinfo_t panel_info = { 72 /* Insert a value here so that we don't end up in the BSS */ 73 .vl_col = -1, 74 }; 75 76 char lcd_cursor_enabled; 77 78 ushort lcd_cursor_width; 79 ushort lcd_cursor_height; 80 81 #ifndef CONFIG_OF_CONTROL 82 #error "You must enable CONFIG_OF_CONTROL to get Tegra LCD support" 83 #endif 84 85 void lcd_cursor_size(ushort width, ushort height) 86 { 87 lcd_cursor_width = width; 88 lcd_cursor_height = height; 89 } 90 91 void lcd_toggle_cursor(void) 92 { 93 ushort x, y; 94 uchar *dest; 95 ushort row; 96 97 x = console_col * lcd_cursor_width; 98 y = console_row * lcd_cursor_height; 99 dest = (uchar *)(lcd_base + y * lcd_line_length + x * (1 << LCD_BPP) / 100 8); 101 102 for (row = 0; row < lcd_cursor_height; ++row, dest += lcd_line_length) { 103 ushort *d = (ushort *)dest; 104 ushort color; 105 int i; 106 107 for (i = 0; i < lcd_cursor_width; ++i) { 108 color = *d; 109 color ^= lcd_getfgcolor(); 110 *d = color; 111 ++d; 112 } 113 } 114 } 115 116 void lcd_cursor_on(void) 117 { 118 lcd_cursor_enabled = 1; 119 lcd_toggle_cursor(); 120 } 121 void lcd_cursor_off(void) 122 { 123 lcd_cursor_enabled = 0; 124 lcd_toggle_cursor(); 125 } 126 127 char lcd_is_cursor_enabled(void) 128 { 129 return lcd_cursor_enabled; 130 } 131 132 static void update_panel_size(struct fdt_disp_config *config) 133 { 134 panel_info.vl_col = config->width; 135 panel_info.vl_row = config->height; 136 panel_info.vl_bpix = config->log2_bpp; 137 } 138 139 /* 140 * Main init function called by lcd driver. 141 * Inits and then prints test pattern if required. 142 */ 143 144 void lcd_ctrl_init(void *lcdbase) 145 { 146 int type = DCACHE_OFF; 147 int size; 148 149 assert(disp_config); 150 151 lcd_base = (void *)disp_config->frame_buffer; 152 153 /* Make sure that we can acommodate the selected LCD */ 154 assert(disp_config->width <= LCD_MAX_WIDTH); 155 assert(disp_config->height <= LCD_MAX_HEIGHT); 156 assert(disp_config->log2_bpp <= LCD_MAX_LOG2_BPP); 157 if (disp_config->width <= LCD_MAX_WIDTH 158 && disp_config->height <= LCD_MAX_HEIGHT 159 && disp_config->log2_bpp <= LCD_MAX_LOG2_BPP) 160 update_panel_size(disp_config); 161 size = lcd_get_size(&lcd_line_length); 162 163 /* Set up the LCD caching as requested */ 164 if (config.cache_type & FDT_LCD_CACHE_WRITE_THROUGH) 165 type = DCACHE_WRITETHROUGH; 166 else if (config.cache_type & FDT_LCD_CACHE_WRITE_BACK) 167 type = DCACHE_WRITEBACK; 168 mmu_set_region_dcache_behaviour(disp_config->frame_buffer, size, type); 169 170 /* Enable flushing after LCD writes if requested */ 171 lcd_set_flush_dcache(config.cache_type & FDT_LCD_CACHE_FLUSH); 172 173 debug("LCD frame buffer at %p\n", lcd_base); 174 } 175 176 ulong calc_fbsize(void) 177 { 178 return (panel_info.vl_col * panel_info.vl_row * 179 NBITS(panel_info.vl_bpix)) / 8; 180 } 181 182 void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue) 183 { 184 } 185 186 void tegra_lcd_early_init(const void *blob) 187 { 188 /* 189 * Go with the maximum size for now. We will fix this up after 190 * relocation. These values are only used for memory alocation. 191 */ 192 panel_info.vl_col = LCD_MAX_WIDTH; 193 panel_info.vl_row = LCD_MAX_HEIGHT; 194 panel_info.vl_bpix = LCD_MAX_LOG2_BPP; 195 } 196 197 /** 198 * Decode the panel information from the fdt. 199 * 200 * @param blob fdt blob 201 * @param config structure to store fdt config into 202 * @return 0 if ok, -ve on error 203 */ 204 static int fdt_decode_lcd(const void *blob, struct fdt_panel_config *config) 205 { 206 int display_node; 207 208 disp_config = tegra_display_get_config(); 209 if (!disp_config) { 210 debug("%s: Display controller is not configured\n", __func__); 211 return -1; 212 } 213 display_node = disp_config->panel_node; 214 if (display_node < 0) { 215 debug("%s: No panel configuration available\n", __func__); 216 return -1; 217 } 218 219 config->pwm_channel = pwm_request(blob, display_node, "nvidia,pwm"); 220 if (config->pwm_channel < 0) { 221 debug("%s: Unable to request PWM channel\n", __func__); 222 return -1; 223 } 224 225 config->cache_type = fdtdec_get_int(blob, display_node, 226 "nvidia,cache-type", 227 FDT_LCD_CACHE_WRITE_BACK_FLUSH); 228 229 /* These GPIOs are all optional */ 230 fdtdec_decode_gpio(blob, display_node, "nvidia,backlight-enable-gpios", 231 &config->backlight_en); 232 fdtdec_decode_gpio(blob, display_node, "nvidia,lvds-shutdown-gpios", 233 &config->lvds_shutdown); 234 fdtdec_decode_gpio(blob, display_node, "nvidia,backlight-vdd-gpios", 235 &config->backlight_vdd); 236 fdtdec_decode_gpio(blob, display_node, "nvidia,panel-vdd-gpios", 237 &config->panel_vdd); 238 239 return fdtdec_get_int_array(blob, display_node, "nvidia,panel-timings", 240 config->panel_timings, FDT_LCD_TIMINGS); 241 } 242 243 /** 244 * Handle the next stage of device init 245 */ 246 static int handle_stage(const void *blob) 247 { 248 debug("%s: stage %d\n", __func__, stage); 249 250 /* do the things for this stage */ 251 switch (stage) { 252 case STAGE_START: 253 /* Initialize the Tegra display controller */ 254 if (tegra_display_probe(gd->fdt_blob, (void *)gd->fb_base)) { 255 printf("%s: Failed to probe display driver\n", 256 __func__); 257 return -1; 258 } 259 260 /* get panel details */ 261 if (fdt_decode_lcd(blob, &config)) { 262 printf("No valid LCD information in device tree\n"); 263 return -1; 264 } 265 266 /* 267 * It is possible that the FDT has requested that the LCD be 268 * disabled. We currently don't support this. It would require 269 * changes to U-Boot LCD subsystem to have LCD support 270 * compiled in but not used. An easier option might be to 271 * still have a frame buffer, but leave the backlight off and 272 * remove all mention of lcd in the stdout environment 273 * variable. 274 */ 275 276 funcmux_select(PERIPH_ID_DISP1, FUNCMUX_DEFAULT); 277 278 fdtdec_setup_gpio(&config.panel_vdd); 279 fdtdec_setup_gpio(&config.lvds_shutdown); 280 fdtdec_setup_gpio(&config.backlight_vdd); 281 fdtdec_setup_gpio(&config.backlight_en); 282 283 /* 284 * TODO: If fdt includes output flag we can omit this code 285 * since fdtdec_setup_gpio will do it for us. 286 */ 287 if (fdt_gpio_isvalid(&config.panel_vdd)) 288 gpio_direction_output(config.panel_vdd.gpio, 0); 289 if (fdt_gpio_isvalid(&config.lvds_shutdown)) 290 gpio_direction_output(config.lvds_shutdown.gpio, 0); 291 if (fdt_gpio_isvalid(&config.backlight_vdd)) 292 gpio_direction_output(config.backlight_vdd.gpio, 0); 293 if (fdt_gpio_isvalid(&config.backlight_en)) 294 gpio_direction_output(config.backlight_en.gpio, 0); 295 break; 296 case STAGE_PANEL_VDD: 297 if (fdt_gpio_isvalid(&config.panel_vdd)) 298 gpio_direction_output(config.panel_vdd.gpio, 1); 299 break; 300 case STAGE_LVDS: 301 if (fdt_gpio_isvalid(&config.lvds_shutdown)) 302 gpio_set_value(config.lvds_shutdown.gpio, 1); 303 break; 304 case STAGE_BACKLIGHT_VDD: 305 if (fdt_gpio_isvalid(&config.backlight_vdd)) 306 gpio_set_value(config.backlight_vdd.gpio, 1); 307 break; 308 case STAGE_PWM: 309 /* Enable PWM at 15/16 high, 32768 Hz with divider 1 */ 310 pinmux_set_func(PINGRP_GPU, PMUX_FUNC_PWM); 311 pinmux_tristate_disable(PINGRP_GPU); 312 313 pwm_enable(config.pwm_channel, 32768, 0xdf, 1); 314 break; 315 case STAGE_BACKLIGHT_EN: 316 if (fdt_gpio_isvalid(&config.backlight_en)) 317 gpio_set_value(config.backlight_en.gpio, 1); 318 break; 319 case STAGE_DONE: 320 break; 321 } 322 323 /* set up timer for next stage */ 324 timer_next = timer_get_us(); 325 if (stage < FDT_LCD_TIMINGS) 326 timer_next += config.panel_timings[stage] * 1000; 327 328 /* move to next stage */ 329 stage++; 330 return 0; 331 } 332 333 int tegra_lcd_check_next_stage(const void *blob, int wait) 334 { 335 if (stage == STAGE_DONE) 336 return 0; 337 338 do { 339 /* wait if we need to */ 340 debug("%s: stage %d\n", __func__, stage); 341 if (stage != STAGE_START) { 342 int delay = timer_next - timer_get_us(); 343 344 if (delay > 0) { 345 if (wait) 346 udelay(delay); 347 else 348 return 0; 349 } 350 } 351 352 if (handle_stage(blob)) 353 return -1; 354 } while (wait && stage != STAGE_DONE); 355 if (stage == STAGE_DONE) 356 debug("%s: LCD init complete\n", __func__); 357 358 return 0; 359 } 360 361 void lcd_enable(void) 362 { 363 /* 364 * Backlight and power init will be done separately in 365 * tegra_lcd_check_next_stage(), which should be called in 366 * board_late_init(). 367 * 368 * U-Boot code supports only colour depth, selected at compile time. 369 * The device tree setting should match this. Otherwise the display 370 * will not look right, and U-Boot may crash. 371 */ 372 if (disp_config->log2_bpp != LCD_BPP) { 373 printf("%s: Error: LCD depth configured in FDT (%d = %dbpp)" 374 " must match setting of LCD_BPP (%d)\n", __func__, 375 disp_config->log2_bpp, disp_config->bpp, LCD_BPP); 376 } 377 } 378