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/drivers/usb/host/ehci-atmel.c

@@ -0,0 +1,43 @@
+/*
+ * (C) Copyright 2012
+ * Atmel Semiconductor <www.atmel.com>
+ * Written-by: Bo Shen <voice.shen@atmel.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <usb.h>
+#include <asm/io.h>
+#include <asm/arch/clk.h>
+
+#include "ehci.h"
+
+int ehci_hcd_init(int index, enum usb_init_type init,
+		struct ehci_hccr **hccr, struct ehci_hcor **hcor)
+{
+	/* Enable UTMI PLL */
+	if (at91_upll_clk_enable())
+		return -1;
+
+	/* Enable USB Host clock */
+	at91_periph_clk_enable(ATMEL_ID_UHPHS);
+
+	*hccr = (struct ehci_hccr *)ATMEL_BASE_EHCI;
+	*hcor = (struct ehci_hcor *)((uint32_t)*hccr +
+			HC_LENGTH(ehci_readl(&(*hccr)->cr_capbase)));
+
+	return 0;
+}
+
+int ehci_hcd_stop(int index)
+{
+	/* Disable USB Host Clock */
+	at91_periph_clk_disable(ATMEL_ID_UHPHS);
+
+	/* Disable UTMI PLL */
+	if (at91_upll_clk_disable())
+		return -1;
+
+	return 0;
+}