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/*
* (C) Copyright 2010
* NVIDIA Corporation <www.nvidia.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __ASM_ARCH_TEGRA_DISPLAY_H
#define __ASM_ARCH_TEGRA_DISPLAY_H
#include <asm/arch/dc.h>
#include <fdtdec.h>
#include <asm/gpio.h>
/* This holds information about a window which can be displayed */
struct disp_ctl_win {
enum win_color_depth_id fmt; /* Color depth/format */
unsigned bpp; /* Bits per pixel */
phys_addr_t phys_addr; /* Physical address in memory */
unsigned x; /* Horizontal address offset (bytes) */
unsigned y; /* Veritical address offset (bytes) */
unsigned w; /* Width of source window */
unsigned h; /* Height of source window */
unsigned stride; /* Number of bytes per line */
unsigned out_x; /* Left edge of output window (col) */
unsigned out_y; /* Top edge of output window (row) */
unsigned out_w; /* Width of output window in pixels */
unsigned out_h; /* Height of output window in pixels */
};
#define FDT_LCD_TIMINGS 4
enum {
FDT_LCD_TIMING_REF_TO_SYNC,
FDT_LCD_TIMING_SYNC_WIDTH,
FDT_LCD_TIMING_BACK_PORCH,
FDT_LCD_TIMING_FRONT_PORCH,
FDT_LCD_TIMING_COUNT,
};
enum lcd_cache_t {
FDT_LCD_CACHE_OFF = 0,
FDT_LCD_CACHE_WRITE_THROUGH = 1 << 0,
FDT_LCD_CACHE_WRITE_BACK = 1 << 1,
FDT_LCD_CACHE_FLUSH = 1 << 2,
FDT_LCD_CACHE_WRITE_BACK_FLUSH = FDT_LCD_CACHE_WRITE_BACK |
FDT_LCD_CACHE_FLUSH,
};
/* Information about the display controller */
struct fdt_disp_config {
int valid; /* config is valid */
int width; /* width in pixels */
int height; /* height in pixels */
int bpp; /* number of bits per pixel */
/*
* log2 of number of bpp, in general, unless it bpp is 24 in which
* case this field holds 24 also! This is a U-Boot thing.
*/
int log2_bpp;
struct disp_ctlr *disp; /* Display controller to use */
fdt_addr_t frame_buffer; /* Address of frame buffer */
unsigned pixel_clock; /* Pixel clock in Hz */
uint horiz_timing[FDT_LCD_TIMING_COUNT]; /* Horizontal timing */
uint vert_timing[FDT_LCD_TIMING_COUNT]; /* Vertical timing */
int panel_node; /* node offset of panel information */
};
/* Information about the LCD panel */
struct fdt_panel_config {
int pwm_channel; /* PWM channel to use for backlight */
enum lcd_cache_t cache_type;
struct gpio_desc backlight_en; /* GPIO for backlight enable */
struct gpio_desc lvds_shutdown; /* GPIO for lvds shutdown */
struct gpio_desc backlight_vdd; /* GPIO for backlight vdd */
struct gpio_desc panel_vdd; /* GPIO for panel vdd */
/*
* Panel required timings
* Timing 1: delay between panel_vdd-rise and data-rise
* Timing 2: delay between data-rise and backlight_vdd-rise
* Timing 3: delay between backlight_vdd and pwm-rise
* Timing 4: delay between pwm-rise and backlight_en-rise
*/
uint panel_timings[FDT_LCD_TIMINGS];
};
/**
* Register a new display based on device tree configuration.
*
* The frame buffer can be positioned by U-Boot or overriden by the fdt.
* You should pass in the U-Boot address here, and check the contents of
* struct fdt_disp_config to see what was actually chosen.
*
* @param blob Device tree blob
* @param default_lcd_base Default address of LCD frame buffer
* @return 0 if ok, -1 on error (unsupported bits per pixel)
*/
int tegra_display_probe(const void *blob, void *default_lcd_base);
/**
* Return the current display configuration
*
* @return pointer to display configuration, or NULL if there is no valid
* config
*/
struct fdt_disp_config *tegra_display_get_config(void);
/**
* Perform the next stage of the LCD init if it is time to do so.
*
* LCD init can be time-consuming because of the number of delays we need
* while waiting for the backlight power supply, etc. This function can
* be called at various times during U-Boot operation to advance the
* initialization of the LCD to the next stage if sufficient time has
* passed since the last stage. It keeps track of what stage it is up to
* and the time that it is permitted to move to the next stage.
*
* The final call should have wait=1 to complete the init.
*
* @param blob fdt blob containing LCD information
* @param wait 1 to wait until all init is complete, and then return
* 0 to return immediately, potentially doing nothing if it is
* not yet time for the next init.
*/
int tegra_lcd_check_next_stage(const void *blob, int wait);
/**
* Set up the maximum LCD size so we can size the frame buffer.
*
* @param blob fdt blob containing LCD information
*/
void tegra_lcd_early_init(const void *blob);
#endif /*__ASM_ARCH_TEGRA_DISPLAY_H*/
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