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/s3c2440_gpio.c

@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2012
+ * Gabriel Huau <contact@huau-gabriel.fr>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+#include <asm/arch/s3c2440.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+#include <errno.h>
+
+#define GPIO_INPUT  0x0
+#define GPIO_OUTPUT 0x1
+
+#define S3C_GPIO_CON	0x0
+#define S3C_GPIO_DAT	0x4
+
+static uint32_t s3c_gpio_get_bank_addr(unsigned gpio)
+{
+	/* There is up to 16 pins per bank, one bank is 0x10 big. */
+	uint32_t addr = gpio & ~0xf;
+
+	if (addr >= 0x80 && addr != 0xd0) {	/* Wrong GPIO bank. */
+		printf("Invalid GPIO bank (bank %02x)\n", addr);
+		return 0xffffffff;
+	}
+
+	return addr | S3C24X0_GPIO_BASE;
+}
+
+int gpio_set_value(unsigned gpio, int value)
+{
+	uint32_t addr = s3c_gpio_get_bank_addr(gpio);
+
+	if (addr == 0xffffffff)
+		return -EINVAL;
+
+	if (value)
+		setbits_le32(addr | S3C_GPIO_DAT, 1 << (gpio & 0xf));
+	else
+		clrbits_le32(addr | S3C_GPIO_DAT, 1 << (gpio & 0xf));
+
+	return 0;
+}
+
+int gpio_get_value(unsigned gpio)
+{
+	uint32_t addr = s3c_gpio_get_bank_addr(gpio);
+
+	if (addr == 0xffffffff)
+		return -EINVAL;
+
+	return !!(readl(addr | S3C_GPIO_DAT) & (1 << (gpio & 0xf)));
+}
+
+int gpio_request(unsigned gpio, const char *label)
+{
+	return 0;
+}
+
+int gpio_free(unsigned gpio)
+{
+	return 0;
+}
+
+static int s3c_gpio_direction(unsigned gpio, uint8_t dir)
+{
+	uint32_t addr = s3c_gpio_get_bank_addr(gpio);
+	const uint32_t mask = 0x3 << ((gpio & 0xf) << 1);
+	const uint32_t dirm = dir << ((gpio & 0xf) << 1);
+
+	if (addr == 0xffffffff)
+		return -EINVAL;
+
+	clrsetbits_le32(addr | S3C_GPIO_CON, mask, dirm);
+	return 0;
+}
+
+int gpio_direction_input(unsigned gpio)
+{
+	return s3c_gpio_direction(gpio, GPIO_INPUT);
+}
+
+int gpio_direction_output(unsigned gpio, int value)
+{
+	return s3c_gpio_direction(gpio, GPIO_OUTPUT);
+}