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 */
67 void *lcd_base
; /* Start of framebuffer memory */
68 void *lcd_console_address
; /* Start of console buffer */
73 vidinfo_t panel_info
= {
74 /* Insert a value here so that we don't end up in the BSS */
78 char lcd_cursor_enabled
;
80 ushort lcd_cursor_width
;
81 ushort lcd_cursor_height
;
83 #ifndef CONFIG_OF_CONTROL
84 #error "You must enable CONFIG_OF_CONTROL to get Tegra LCD support"
87 void lcd_cursor_size(ushort width
, ushort height
)
89 lcd_cursor_width
= width
;
90 lcd_cursor_height
= height
;
93 void lcd_toggle_cursor(void)
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
) /
104 for (row
= 0; row
< lcd_cursor_height
; ++row
, dest
+= lcd_line_length
) {
105 ushort
*d
= (ushort
*)dest
;
109 for (i
= 0; i
< lcd_cursor_width
; ++i
) {
111 color
^= lcd_color_fg
;
118 void lcd_cursor_on(void)
120 lcd_cursor_enabled
= 1;
123 void lcd_cursor_off(void)
125 lcd_cursor_enabled
= 0;
129 char lcd_is_cursor_enabled(void)
131 return lcd_cursor_enabled
;
134 static void update_panel_size(struct fdt_disp_config
*config
)
136 panel_info
.vl_col
= config
->width
;
137 panel_info
.vl_row
= config
->height
;
138 panel_info
.vl_bpix
= config
->log2_bpp
;
142 * Main init function called by lcd driver.
143 * Inits and then prints test pattern if required.
146 void lcd_ctrl_init(void *lcdbase
)
148 int line_length
, size
;
149 int type
= DCACHE_OFF
;
153 lcd_base
= (void *)disp_config
->frame_buffer
;
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
);
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
);
172 /* Enable flushing after LCD writes if requested */
173 lcd_set_flush_dcache(config
.cache_type
& FDT_LCD_CACHE_FLUSH
);
175 debug("LCD frame buffer at %p\n", lcd_base
);
178 ulong
calc_fbsize(void)
180 return (panel_info
.vl_col
* panel_info
.vl_row
*
181 NBITS(panel_info
.vl_bpix
)) / 8;
184 void lcd_setcolreg(ushort regno
, ushort red
, ushort green
, ushort blue
)
188 void tegra_lcd_early_init(const void *blob
)
191 * Go with the maximum size for now. We will fix this up after
192 * relocation. These values are only used for memory alocation.
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
;
200 * Decode the panel information from the fdt.
202 * @param blob fdt blob
203 * @param config structure to store fdt config into
204 * @return 0 if ok, -ve on error
206 static int fdt_decode_lcd(const void *blob
, struct fdt_panel_config
*config
)
210 disp_config
= tegra_display_get_config();
212 debug("%s: Display controller is not configured\n", __func__
);
215 display_node
= disp_config
->panel_node
;
216 if (display_node
< 0) {
217 debug("%s: No panel configuration available\n", __func__
);
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__
);
227 config
->cache_type
= fdtdec_get_int(blob
, display_node
,
229 FDT_LCD_CACHE_WRITE_BACK_FLUSH
);
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",
241 return fdtdec_get_int_array(blob
, display_node
, "nvidia,panel-timings",
242 config
->panel_timings
, FDT_LCD_TIMINGS
);
246 * Handle the next stage of device init
248 static int handle_stage(const void *blob
)
250 debug("%s: stage %d\n", __func__
, stage
);
252 /* do the things for this stage */
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",
262 /* get panel details */
263 if (fdt_decode_lcd(blob
, &config
)) {
264 printf("No valid LCD information in device tree\n");
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
278 funcmux_select(PERIPH_ID_DISP1
, FUNCMUX_DEFAULT
);
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
);
286 * TODO: If fdt includes output flag we can omit this code
287 * since fdtdec_setup_gpio will do it for us.
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);
298 case STAGE_PANEL_VDD
:
299 if (fdt_gpio_isvalid(&config
.panel_vdd
))
300 gpio_direction_output(config
.panel_vdd
.gpio
, 1);
303 if (fdt_gpio_isvalid(&config
.lvds_shutdown
))
304 gpio_set_value(config
.lvds_shutdown
.gpio
, 1);
306 case STAGE_BACKLIGHT_VDD
:
307 if (fdt_gpio_isvalid(&config
.backlight_vdd
))
308 gpio_set_value(config
.backlight_vdd
.gpio
, 1);
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
);
315 pwm_enable(config
.pwm_channel
, 32768, 0xdf, 1);
317 case STAGE_BACKLIGHT_EN
:
318 if (fdt_gpio_isvalid(&config
.backlight_en
))
319 gpio_set_value(config
.backlight_en
.gpio
, 1);
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;
330 /* move to next stage */
335 int tegra_lcd_check_next_stage(const void *blob
, int wait
)
337 if (stage
== STAGE_DONE
)
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();
354 if (handle_stage(blob
))
356 } while (wait
&& stage
!= STAGE_DONE
);
357 if (stage
== STAGE_DONE
)
358 debug("%s: LCD init complete\n", __func__
);
363 void lcd_enable(void)
366 * Backlight and power init will be done separately in
367 * tegra_lcd_check_next_stage(), which should be called in
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.
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
);