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 #ifndef CONFIG_OF_CONTROL
77 #error "You must enable CONFIG_OF_CONTROL to get Tegra LCD support"
80 static void update_panel_size(struct fdt_disp_config *config)
82 panel_info.vl_col = config->width;
83 panel_info.vl_row = config->height;
84 panel_info.vl_bpix = config->log2_bpp;
88 * Main init function called by lcd driver.
89 * Inits and then prints test pattern if required.
92 void lcd_ctrl_init(void *lcdbase)
94 int type = DCACHE_OFF;
99 lcd_base = (void *)disp_config->frame_buffer;
101 /* Make sure that we can acommodate the selected LCD */
102 assert(disp_config->width <= LCD_MAX_WIDTH);
103 assert(disp_config->height <= LCD_MAX_HEIGHT);
104 assert(disp_config->log2_bpp <= LCD_MAX_LOG2_BPP);
105 if (disp_config->width <= LCD_MAX_WIDTH
106 && disp_config->height <= LCD_MAX_HEIGHT
107 && disp_config->log2_bpp <= LCD_MAX_LOG2_BPP)
108 update_panel_size(disp_config);
109 size = lcd_get_size(&lcd_line_length);
111 /* Set up the LCD caching as requested */
112 if (config.cache_type & FDT_LCD_CACHE_WRITE_THROUGH)
113 type = DCACHE_WRITETHROUGH;
114 else if (config.cache_type & FDT_LCD_CACHE_WRITE_BACK)
115 type = DCACHE_WRITEBACK;
116 mmu_set_region_dcache_behaviour(disp_config->frame_buffer, size, type);
118 /* Enable flushing after LCD writes if requested */
119 lcd_set_flush_dcache(config.cache_type & FDT_LCD_CACHE_FLUSH);
121 debug("LCD frame buffer at %p\n", lcd_base);
124 ulong calc_fbsize(void)
126 return (panel_info.vl_col * panel_info.vl_row *
127 NBITS(panel_info.vl_bpix)) / 8;
130 void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue)
134 void tegra_lcd_early_init(const void *blob)
137 * Go with the maximum size for now. We will fix this up after
138 * relocation. These values are only used for memory alocation.
140 panel_info.vl_col = LCD_MAX_WIDTH;
141 panel_info.vl_row = LCD_MAX_HEIGHT;
142 panel_info.vl_bpix = LCD_MAX_LOG2_BPP;
146 * Decode the panel information from the fdt.
148 * @param blob fdt blob
149 * @param config structure to store fdt config into
150 * @return 0 if ok, -ve on error
152 static int fdt_decode_lcd(const void *blob, struct fdt_panel_config *config)
156 disp_config = tegra_display_get_config();
158 debug("%s: Display controller is not configured\n", __func__);
161 display_node = disp_config->panel_node;
162 if (display_node < 0) {
163 debug("%s: No panel configuration available\n", __func__);
167 config->pwm_channel = pwm_request(blob, display_node, "nvidia,pwm");
168 if (config->pwm_channel < 0) {
169 debug("%s: Unable to request PWM channel\n", __func__);
173 config->cache_type = fdtdec_get_int(blob, display_node,
175 FDT_LCD_CACHE_WRITE_BACK_FLUSH);
177 /* These GPIOs are all optional */
178 fdtdec_decode_gpio(blob, display_node, "nvidia,backlight-enable-gpios",
179 &config->backlight_en);
180 fdtdec_decode_gpio(blob, display_node, "nvidia,lvds-shutdown-gpios",
181 &config->lvds_shutdown);
182 fdtdec_decode_gpio(blob, display_node, "nvidia,backlight-vdd-gpios",
183 &config->backlight_vdd);
184 fdtdec_decode_gpio(blob, display_node, "nvidia,panel-vdd-gpios",
187 return fdtdec_get_int_array(blob, display_node, "nvidia,panel-timings",
188 config->panel_timings, FDT_LCD_TIMINGS);
192 * Handle the next stage of device init
194 static int handle_stage(const void *blob)
196 debug("%s: stage %d\n", __func__, stage);
198 /* do the things for this stage */
201 /* Initialize the Tegra display controller */
202 if (tegra_display_probe(gd->fdt_blob, (void *)gd->fb_base)) {
203 printf("%s: Failed to probe display driver\n",
208 /* get panel details */
209 if (fdt_decode_lcd(blob, &config)) {
210 printf("No valid LCD information in device tree\n");
215 * It is possible that the FDT has requested that the LCD be
216 * disabled. We currently don't support this. It would require
217 * changes to U-Boot LCD subsystem to have LCD support
218 * compiled in but not used. An easier option might be to
219 * still have a frame buffer, but leave the backlight off and
220 * remove all mention of lcd in the stdout environment
224 funcmux_select(PERIPH_ID_DISP1, FUNCMUX_DEFAULT);
226 fdtdec_setup_gpio(&config.panel_vdd);
227 fdtdec_setup_gpio(&config.lvds_shutdown);
228 fdtdec_setup_gpio(&config.backlight_vdd);
229 fdtdec_setup_gpio(&config.backlight_en);
232 * TODO: If fdt includes output flag we can omit this code
233 * since fdtdec_setup_gpio will do it for us.
235 if (fdt_gpio_isvalid(&config.panel_vdd))
236 gpio_direction_output(config.panel_vdd.gpio, 0);
237 if (fdt_gpio_isvalid(&config.lvds_shutdown))
238 gpio_direction_output(config.lvds_shutdown.gpio, 0);
239 if (fdt_gpio_isvalid(&config.backlight_vdd))
240 gpio_direction_output(config.backlight_vdd.gpio, 0);
241 if (fdt_gpio_isvalid(&config.backlight_en))
242 gpio_direction_output(config.backlight_en.gpio, 0);
244 case STAGE_PANEL_VDD:
245 if (fdt_gpio_isvalid(&config.panel_vdd))
246 gpio_direction_output(config.panel_vdd.gpio, 1);
249 if (fdt_gpio_isvalid(&config.lvds_shutdown))
250 gpio_set_value(config.lvds_shutdown.gpio, 1);
252 case STAGE_BACKLIGHT_VDD:
253 if (fdt_gpio_isvalid(&config.backlight_vdd))
254 gpio_set_value(config.backlight_vdd.gpio, 1);
257 /* Enable PWM at 15/16 high, 32768 Hz with divider 1 */
258 pinmux_set_func(PINGRP_GPU, PMUX_FUNC_PWM);
259 pinmux_tristate_disable(PINGRP_GPU);
261 pwm_enable(config.pwm_channel, 32768, 0xdf, 1);
263 case STAGE_BACKLIGHT_EN:
264 if (fdt_gpio_isvalid(&config.backlight_en))
265 gpio_set_value(config.backlight_en.gpio, 1);
271 /* set up timer for next stage */
272 timer_next = timer_get_us();
273 if (stage < FDT_LCD_TIMINGS)
274 timer_next += config.panel_timings[stage] * 1000;
276 /* move to next stage */
281 int tegra_lcd_check_next_stage(const void *blob, int wait)
283 if (stage == STAGE_DONE)
287 /* wait if we need to */
288 debug("%s: stage %d\n", __func__, stage);
289 if (stage != STAGE_START) {
290 int delay = timer_next - timer_get_us();
300 if (handle_stage(blob))
302 } while (wait && stage != STAGE_DONE);
303 if (stage == STAGE_DONE)
304 debug("%s: LCD init complete\n", __func__);
309 void lcd_enable(void)
312 * Backlight and power init will be done separately in
313 * tegra_lcd_check_next_stage(), which should be called in
316 * U-Boot code supports only colour depth, selected at compile time.
317 * The device tree setting should match this. Otherwise the display
318 * will not look right, and U-Boot may crash.
320 if (disp_config->log2_bpp != LCD_BPP) {
321 printf("%s: Error: LCD depth configured in FDT (%d = %dbpp)"
322 " must match setting of LCD_BPP (%d)\n", __func__,
323 disp_config->log2_bpp, disp_config->bpp, LCD_BPP);