avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/board/freescale/ls1021aqds/dcu.c

@@ -0,0 +1,92 @@
+/*
+ * Copyright 2014 Freescale Semiconductor, Inc.
+ *
+ * FSL DCU Framebuffer driver
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <asm/io.h>
+#include <common.h>
+#include <fsl_dcu_fb.h>
+#include <i2c.h>
+#include "div64.h"
+#include "../common/diu_ch7301.h"
+#include "ls1021aqds_qixis.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int select_i2c_ch_pca9547(u8 ch)
+{
+	int ret;
+
+	ret = i2c_write(I2C_MUX_PCA_ADDR_PRI, 0, 1, &ch, 1);
+	if (ret) {
+		puts("PCA: failed to select proper channel\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+unsigned int dcu_set_pixel_clock(unsigned int pixclock)
+{
+	unsigned long long div;
+
+	div = (unsigned long long)(gd->bus_clk / 1000);
+	div *= (unsigned long long)pixclock;
+	do_div(div, 1000000000);
+
+	return div;
+}
+
+int platform_dcu_init(unsigned int xres, unsigned int yres,
+		      const char *port,
+		      struct fb_videomode *dcu_fb_videomode)
+{
+	const char *name;
+	unsigned int pixel_format;
+	int ret;
+	u8 ch;
+
+	/* Mux I2C3+I2C4 as HSYNC+VSYNC */
+	ret = i2c_read(CONFIG_SYS_I2C_QIXIS_ADDR, QIXIS_DCU_BRDCFG5,
+		       1, &ch, 1);
+	if (ret) {
+		printf("Error: failed to read I2C @%02x\n",
+		       CONFIG_SYS_I2C_QIXIS_ADDR);
+		return ret;
+	}
+	ch &= 0x1F;
+	ch |= 0xA0;
+	ret = i2c_write(CONFIG_SYS_I2C_QIXIS_ADDR, QIXIS_DCU_BRDCFG5,
+			1, &ch, 1);
+	if (ret) {
+		printf("Error: failed to write I2C @%02x\n",
+		       CONFIG_SYS_I2C_QIXIS_ADDR);
+		return ret;
+	}
+
+	if (strncmp(port, "hdmi", 4) == 0) {
+		unsigned long pixval;
+
+		name = "HDMI";
+
+		pixval = 1000000000 / dcu_fb_videomode->pixclock;
+		pixval *= 1000;
+
+		i2c_set_bus_num(CONFIG_SYS_I2C_DVI_BUS_NUM);
+		select_i2c_ch_pca9547(I2C_MUX_CH_CH7301);
+		diu_set_dvi_encoder(pixval);
+		select_i2c_ch_pca9547(I2C_MUX_CH_DEFAULT);
+	} else {
+		return 0;
+	}
+
+	printf("DCU: Switching to %s monitor @ %ux%u\n", name, xres, yres);
+
+	pixel_format = 32;
+	fsl_dcu_init(xres, yres, pixel_format);
+
+	return 0;
+}