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/serial/serial_xuartlite.c

@@ -0,0 +1,142 @@
+/*
+ * (C) Copyright 2008 - 2015 Michal Simek <monstr@monstr.eu>
+ * Clean driver and add xilinx constant from header file
+ *
+ * (C) Copyright 2004 Atmark Techno, Inc.
+ * Yasushi SHOJI <yashi@atmark-techno.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <config.h>
+#include <common.h>
+#include <dm.h>
+#include <asm/io.h>
+#include <linux/compiler.h>
+#include <serial.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define SR_TX_FIFO_FULL		BIT(3) /* transmit FIFO full */
+#define SR_TX_FIFO_EMPTY	BIT(2) /* transmit FIFO empty */
+#define SR_RX_FIFO_VALID_DATA	BIT(0) /* data in receive FIFO */
+#define SR_RX_FIFO_FULL		BIT(1) /* receive FIFO full */
+
+#define ULITE_CONTROL_RST_TX	0x01
+#define ULITE_CONTROL_RST_RX	0x02
+
+struct uartlite {
+	unsigned int rx_fifo;
+	unsigned int tx_fifo;
+	unsigned int status;
+	unsigned int control;
+};
+
+struct uartlite_platdata {
+	struct uartlite *regs;
+};
+
+static int uartlite_serial_putc(struct udevice *dev, const char ch)
+{
+	struct uartlite_platdata *plat = dev_get_platdata(dev);
+	struct uartlite *regs = plat->regs;
+
+	if (in_be32(&regs->status) & SR_TX_FIFO_FULL)
+		return -EAGAIN;
+
+	out_be32(&regs->tx_fifo, ch & 0xff);
+
+	return 0;
+}
+
+static int uartlite_serial_getc(struct udevice *dev)
+{
+	struct uartlite_platdata *plat = dev_get_platdata(dev);
+	struct uartlite *regs = plat->regs;
+
+	if (!(in_be32(&regs->status) & SR_RX_FIFO_VALID_DATA))
+		return -EAGAIN;
+
+	return in_be32(&regs->rx_fifo) & 0xff;
+}
+
+static int uartlite_serial_pending(struct udevice *dev, bool input)
+{
+	struct uartlite_platdata *plat = dev_get_platdata(dev);
+	struct uartlite *regs = plat->regs;
+
+	if (input)
+		return in_be32(&regs->status) & SR_RX_FIFO_VALID_DATA;
+
+	return !(in_be32(&regs->status) & SR_TX_FIFO_EMPTY);
+}
+
+static int uartlite_serial_probe(struct udevice *dev)
+{
+	struct uartlite_platdata *plat = dev_get_platdata(dev);
+	struct uartlite *regs = plat->regs;
+
+	out_be32(&regs->control, 0);
+	out_be32(&regs->control, ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX);
+	in_be32(&regs->control);
+
+	return 0;
+}
+
+static int uartlite_serial_ofdata_to_platdata(struct udevice *dev)
+{
+	struct uartlite_platdata *plat = dev_get_platdata(dev);
+
+	plat->regs = (struct uartlite *)dev_get_addr(dev);
+
+	return 0;
+}
+
+static const struct dm_serial_ops uartlite_serial_ops = {
+	.putc = uartlite_serial_putc,
+	.pending = uartlite_serial_pending,
+	.getc = uartlite_serial_getc,
+};
+
+static const struct udevice_id uartlite_serial_ids[] = {
+	{ .compatible = "xlnx,opb-uartlite-1.00.b", },
+	{ .compatible = "xlnx,xps-uartlite-1.00.a" },
+	{ }
+};
+
+U_BOOT_DRIVER(serial_uartlite) = {
+	.name	= "serial_uartlite",
+	.id	= UCLASS_SERIAL,
+	.of_match = uartlite_serial_ids,
+	.ofdata_to_platdata = uartlite_serial_ofdata_to_platdata,
+	.platdata_auto_alloc_size = sizeof(struct uartlite_platdata),
+	.probe = uartlite_serial_probe,
+	.ops	= &uartlite_serial_ops,
+	.flags = DM_FLAG_PRE_RELOC,
+};
+
+#ifdef CONFIG_DEBUG_UART_UARTLITE
+
+#include <debug_uart.h>
+
+static inline void _debug_uart_init(void)
+{
+	struct uartlite *regs = (struct uartlite *)CONFIG_DEBUG_UART_BASE;
+
+	out_be32(&regs->control, 0);
+	out_be32(&regs->control, ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX);
+	in_be32(&regs->control);
+}
+
+static inline void _debug_uart_putc(int ch)
+{
+	struct uartlite *regs = (struct uartlite *)CONFIG_DEBUG_UART_BASE;
+
+	while (in_be32(&regs->status) & SR_TX_FIFO_FULL)
+		;
+
+	out_be32(&regs->tx_fifo, ch & 0xff);
+}
+
+DEBUG_UART_FUNCS
+#endif