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_uniphier.c

@@ -0,0 +1,145 @@
+/*
+ * Copyright (C) 2012-2015 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <linux/io.h>
+#include <linux/serial_reg.h>
+#include <linux/sizes.h>
+#include <asm/errno.h>
+#include <dm/device.h>
+#include <mapmem.h>
+#include <serial.h>
+#include <fdtdec.h>
+
+/*
+ * Note: Register map is slightly different from that of 16550.
+ */
+struct uniphier_serial {
+	u32 rx;			/* In:  Receive buffer */
+#define tx rx			/* Out: Transmit buffer */
+	u32 ier;		/* Interrupt Enable Register */
+	u32 iir;		/* In: Interrupt ID Register */
+	u32 char_fcr;		/* Charactor / FIFO Control Register */
+	u32 lcr_mcr;		/* Line/Modem Control Register */
+#define LCR_SHIFT	8
+#define LCR_MASK	(0xff << (LCR_SHIFT))
+	u32 lsr;		/* In: Line Status Register */
+	u32 msr;		/* In: Modem Status Register */
+	u32 __rsv0;
+	u32 __rsv1;
+	u32 dlr;		/* Divisor Latch Register */
+};
+
+struct uniphier_serial_private_data {
+	struct uniphier_serial __iomem *membase;
+	unsigned int uartclk;
+};
+
+#define uniphier_serial_port(dev)	\
+	((struct uniphier_serial_private_data *)dev_get_priv(dev))->membase
+
+static int uniphier_serial_setbrg(struct udevice *dev, int baudrate)
+{
+	struct uniphier_serial_private_data *priv = dev_get_priv(dev);
+	struct uniphier_serial __iomem *port = uniphier_serial_port(dev);
+	const unsigned int mode_x_div = 16;
+	unsigned int divisor;
+
+	divisor = DIV_ROUND_CLOSEST(priv->uartclk, mode_x_div * baudrate);
+
+	writel(divisor, &port->dlr);
+
+	return 0;
+}
+
+static int uniphier_serial_getc(struct udevice *dev)
+{
+	struct uniphier_serial __iomem *port = uniphier_serial_port(dev);
+
+	if (!(readl(&port->lsr) & UART_LSR_DR))
+		return -EAGAIN;
+
+	return readl(&port->rx);
+}
+
+static int uniphier_serial_putc(struct udevice *dev, const char c)
+{
+	struct uniphier_serial __iomem *port = uniphier_serial_port(dev);
+
+	if (!(readl(&port->lsr) & UART_LSR_THRE))
+		return -EAGAIN;
+
+	writel(c, &port->tx);
+
+	return 0;
+}
+
+static int uniphier_serial_pending(struct udevice *dev, bool input)
+{
+	struct uniphier_serial __iomem *port = uniphier_serial_port(dev);
+
+	if (input)
+		return readl(&port->lsr) & UART_LSR_DR;
+	else
+		return !(readl(&port->lsr) & UART_LSR_THRE);
+}
+
+static int uniphier_serial_probe(struct udevice *dev)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+	struct uniphier_serial_private_data *priv = dev_get_priv(dev);
+	struct uniphier_serial __iomem *port;
+	fdt_addr_t base;
+	u32 tmp;
+
+	base = dev_get_addr(dev);
+	if (base == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	port = map_sysmem(base, SZ_64);
+	if (!port)
+		return -ENOMEM;
+
+	priv->membase = port;
+
+	priv->uartclk = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
+				       "clock-frequency", 0);
+
+	tmp = readl(&port->lcr_mcr);
+	tmp &= ~LCR_MASK;
+	tmp |= UART_LCR_WLEN8 << LCR_SHIFT;
+	writel(tmp, &port->lcr_mcr);
+
+	return 0;
+}
+
+static int uniphier_serial_remove(struct udevice *dev)
+{
+	unmap_sysmem(uniphier_serial_port(dev));
+
+	return 0;
+}
+
+static const struct udevice_id uniphier_uart_of_match[] = {
+	{ .compatible = "socionext,uniphier-uart" },
+	{ /* sentinel */ }
+};
+
+static const struct dm_serial_ops uniphier_serial_ops = {
+	.setbrg = uniphier_serial_setbrg,
+	.getc = uniphier_serial_getc,
+	.putc = uniphier_serial_putc,
+	.pending = uniphier_serial_pending,
+};
+
+U_BOOT_DRIVER(uniphier_serial) = {
+	.name = "uniphier-uart",
+	.id = UCLASS_SERIAL,
+	.of_match = uniphier_uart_of_match,
+	.probe = uniphier_serial_probe,
+	.remove = uniphier_serial_remove,
+	.priv_auto_alloc_size = sizeof(struct uniphier_serial_private_data),
+	.ops = &uniphier_serial_ops,
+};