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/gpio/rk_gpio.c

@@ -0,0 +1,141 @@
+/*
+ * (C) Copyright 2015 Google, Inc
+ *
+ * (C) Copyright 2008-2014 Rockchip Electronics
+ * Peter, Software Engineering, <superpeter.cai@gmail.com>.
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <syscon.h>
+#include <asm/errno.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+#include <dm/pinctrl.h>
+#include <dt-bindings/clock/rk3288-cru.h>
+
+enum {
+	ROCKCHIP_GPIOS_PER_BANK		= 32,
+};
+
+#define OFFSET_TO_BIT(bit)	(1UL << (bit))
+
+struct rockchip_gpio_priv {
+	struct rockchip_gpio_regs *regs;
+	struct udevice *pinctrl;
+	int bank;
+	char name[2];
+};
+
+static int rockchip_gpio_direction_input(struct udevice *dev, unsigned offset)
+{
+	struct rockchip_gpio_priv *priv = dev_get_priv(dev);
+	struct rockchip_gpio_regs *regs = priv->regs;
+
+	clrbits_le32(&regs->swport_ddr, OFFSET_TO_BIT(offset));
+
+	return 0;
+}
+
+static int rockchip_gpio_direction_output(struct udevice *dev, unsigned offset,
+					  int value)
+{
+	struct rockchip_gpio_priv *priv = dev_get_priv(dev);
+	struct rockchip_gpio_regs *regs = priv->regs;
+	int mask = OFFSET_TO_BIT(offset);
+
+	clrsetbits_le32(&regs->swport_dr, mask, value ? mask : 0);
+	setbits_le32(&regs->swport_ddr, mask);
+
+	return 0;
+}
+
+static int rockchip_gpio_get_value(struct udevice *dev, unsigned offset)
+{
+	struct rockchip_gpio_priv *priv = dev_get_priv(dev);
+	struct rockchip_gpio_regs *regs = priv->regs;
+
+	return readl(&regs->ext_port) & OFFSET_TO_BIT(offset) ? 1 : 0;
+}
+
+static int rockchip_gpio_set_value(struct udevice *dev, unsigned offset,
+				   int value)
+{
+	struct rockchip_gpio_priv *priv = dev_get_priv(dev);
+	struct rockchip_gpio_regs *regs = priv->regs;
+	int mask = OFFSET_TO_BIT(offset);
+
+	clrsetbits_le32(&regs->swport_dr, mask, value ? mask : 0);
+
+	return 0;
+}
+
+static int rockchip_gpio_get_function(struct udevice *dev, unsigned offset)
+{
+#ifdef CONFIG_SPL_BUILD
+	return -ENODATA;
+#else
+	struct rockchip_gpio_priv *priv = dev_get_priv(dev);
+	struct rockchip_gpio_regs *regs = priv->regs;
+	bool is_output;
+	int ret;
+
+	ret = pinctrl_get_gpio_mux(priv->pinctrl, priv->bank, offset);
+	if (ret)
+		return ret;
+
+	/* If it's not 0, then it is not a GPIO */
+	if (ret)
+		return GPIOF_FUNC;
+	is_output = readl(&regs->swport_ddr) & OFFSET_TO_BIT(offset);
+
+	return is_output ? GPIOF_OUTPUT : GPIOF_INPUT;
+#endif
+}
+
+static int rockchip_gpio_probe(struct udevice *dev)
+{
+	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+	struct rockchip_gpio_priv *priv = dev_get_priv(dev);
+	char *end;
+	int ret;
+
+	/* This only supports RK3288 at present */
+	priv->regs = (struct rockchip_gpio_regs *)dev_get_addr(dev);
+	ret = uclass_first_device_err(UCLASS_PINCTRL, &priv->pinctrl);
+	if (ret)
+		return ret;
+
+	uc_priv->gpio_count = ROCKCHIP_GPIOS_PER_BANK;
+	end = strrchr(dev->name, '@');
+	priv->bank = trailing_strtoln(dev->name, end);
+	priv->name[0] = 'A' + priv->bank;
+	uc_priv->bank_name = priv->name;
+
+	return 0;
+}
+
+static const struct dm_gpio_ops gpio_rockchip_ops = {
+	.direction_input	= rockchip_gpio_direction_input,
+	.direction_output	= rockchip_gpio_direction_output,
+	.get_value		= rockchip_gpio_get_value,
+	.set_value		= rockchip_gpio_set_value,
+	.get_function		= rockchip_gpio_get_function,
+};
+
+static const struct udevice_id rockchip_gpio_ids[] = {
+	{ .compatible = "rockchip,gpio-bank" },
+	{ }
+};
+
+U_BOOT_DRIVER(gpio_rockchip) = {
+	.name	= "gpio_rockchip",
+	.id	= UCLASS_GPIO,
+	.of_match = rockchip_gpio_ids,
+	.ops	= &gpio_rockchip_ops,
+	.priv_auto_alloc_size = sizeof(struct rockchip_gpio_priv),
+	.probe	= rockchip_gpio_probe,
+};