2 * Copyright (c) 2011 The Chromium OS Authors.
3 * See file CREDITS for list of people who contributed to this
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.
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.
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,
26 #include <asm/system.h>
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>
36 DECLARE_GLOBAL_DATA_PTR;
38 /* These are the stages we go throuh in enabling the LCD */
49 static enum stage_t stage; /* Current stage we are at */
50 static unsigned long timer_next; /* Time we can move onto next stage */
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 */
57 /* Maximum LCD size we support */
60 LCD_MAX_LOG2_BPP = 4, /* 2^4 = 16 bpp */
65 void *lcd_base; /* Start of framebuffer memory */
66 void *lcd_console_address; /* Start of console buffer */
71 vidinfo_t panel_info = {
72 /* Insert a value here so that we don't end up in the BSS */
76 char lcd_cursor_enabled;
78 ushort lcd_cursor_width;
79 ushort lcd_cursor_height;
81 #ifndef CONFIG_OF_CONTROL
82 #error "You must enable CONFIG_OF_CONTROL to get Tegra LCD support"
85 void lcd_cursor_size(ushort width, ushort height)
87 lcd_cursor_width = width;
88 lcd_cursor_height = height;
91 void lcd_toggle_cursor(void)
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) /
102 for (row = 0; row < lcd_cursor_height; ++row, dest += lcd_line_length) {
103 ushort *d = (ushort *)dest;
107 for (i = 0; i < lcd_cursor_width; ++i) {
109 color ^= lcd_getfgcolor();
116 void lcd_cursor_on(void)
118 lcd_cursor_enabled = 1;
121 void lcd_cursor_off(void)
123 lcd_cursor_enabled = 0;
127 char lcd_is_cursor_enabled(void)
129 return lcd_cursor_enabled;
132 static void update_panel_size(struct fdt_disp_config *config)
134 panel_info.vl_col = config->width;
135 panel_info.vl_row = config->height;
136 panel_info.vl_bpix = config->log2_bpp;
140 * Main init function called by lcd driver.
141 * Inits and then prints test pattern if required.
144 void lcd_ctrl_init(void *lcdbase)
146 int type = DCACHE_OFF;
151 lcd_base = (void *)disp_config->frame_buffer;
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);
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);
170 /* Enable flushing after LCD writes if requested */
171 lcd_set_flush_dcache(config.cache_type & FDT_LCD_CACHE_FLUSH);
173 debug("LCD frame buffer at %p\n", lcd_base);
176 ulong calc_fbsize(void)
178 return (panel_info.vl_col * panel_info.vl_row *
179 NBITS(panel_info.vl_bpix)) / 8;
182 void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue)
186 void tegra_lcd_early_init(const void *blob)
189 * Go with the maximum size for now. We will fix this up after
190 * relocation. These values are only used for memory alocation.
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;
198 * Decode the panel information from the fdt.
200 * @param blob fdt blob
201 * @param config structure to store fdt config into
202 * @return 0 if ok, -ve on error
204 static int fdt_decode_lcd(const void *blob, struct fdt_panel_config *config)
208 disp_config = tegra_display_get_config();
210 debug("%s: Display controller is not configured\n", __func__);
213 display_node = disp_config->panel_node;
214 if (display_node < 0) {
215 debug("%s: No panel configuration available\n", __func__);
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__);
225 config->cache_type = fdtdec_get_int(blob, display_node,
227 FDT_LCD_CACHE_WRITE_BACK_FLUSH);
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",
239 return fdtdec_get_int_array(blob, display_node, "nvidia,panel-timings",
240 config->panel_timings, FDT_LCD_TIMINGS);
244 * Handle the next stage of device init
246 static int handle_stage(const void *blob)
248 debug("%s: stage %d\n", __func__, stage);
250 /* do the things for this stage */
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",
260 /* get panel details */
261 if (fdt_decode_lcd(blob, &config)) {
262 printf("No valid LCD information in device tree\n");
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
276 funcmux_select(PERIPH_ID_DISP1, FUNCMUX_DEFAULT);
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);
284 * TODO: If fdt includes output flag we can omit this code
285 * since fdtdec_setup_gpio will do it for us.
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);
296 case STAGE_PANEL_VDD:
297 if (fdt_gpio_isvalid(&config.panel_vdd))
298 gpio_direction_output(config.panel_vdd.gpio, 1);
301 if (fdt_gpio_isvalid(&config.lvds_shutdown))
302 gpio_set_value(config.lvds_shutdown.gpio, 1);
304 case STAGE_BACKLIGHT_VDD:
305 if (fdt_gpio_isvalid(&config.backlight_vdd))
306 gpio_set_value(config.backlight_vdd.gpio, 1);
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);
313 pwm_enable(config.pwm_channel, 32768, 0xdf, 1);
315 case STAGE_BACKLIGHT_EN:
316 if (fdt_gpio_isvalid(&config.backlight_en))
317 gpio_set_value(config.backlight_en.gpio, 1);
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;
328 /* move to next stage */
333 int tegra_lcd_check_next_stage(const void *blob, int wait)
335 if (stage == STAGE_DONE)
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();
352 if (handle_stage(blob))
354 } while (wait && stage != STAGE_DONE);
355 if (stage == STAGE_DONE)
356 debug("%s: LCD init complete\n", __func__);
361 void lcd_enable(void)
364 * Backlight and power init will be done separately in
365 * tegra_lcd_check_next_stage(), which should be called in
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.
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);