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/mxs_gpio.c

@@ -0,0 +1,130 @@
+/*
+ * Freescale i.MX28 GPIO control code
+ *
+ * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
+ * on behalf of DENX Software Engineering GmbH
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/errno.h>
+#include <asm/io.h>
+#include <asm/arch/iomux.h>
+#include <asm/arch/imx-regs.h>
+
+#if	defined(CONFIG_MX23)
+#define	PINCTRL_BANKS		3
+#define	PINCTRL_DOUT(n)		(0x0500 + ((n) * 0x10))
+#define	PINCTRL_DIN(n)		(0x0600 + ((n) * 0x10))
+#define	PINCTRL_DOE(n)		(0x0700 + ((n) * 0x10))
+#define	PINCTRL_PIN2IRQ(n)	(0x0800 + ((n) * 0x10))
+#define	PINCTRL_IRQEN(n)	(0x0900 + ((n) * 0x10))
+#define	PINCTRL_IRQSTAT(n)	(0x0c00 + ((n) * 0x10))
+#elif	defined(CONFIG_MX28)
+#define	PINCTRL_BANKS		5
+#define	PINCTRL_DOUT(n)		(0x0700 + ((n) * 0x10))
+#define	PINCTRL_DIN(n)		(0x0900 + ((n) * 0x10))
+#define	PINCTRL_DOE(n)		(0x0b00 + ((n) * 0x10))
+#define	PINCTRL_PIN2IRQ(n)	(0x1000 + ((n) * 0x10))
+#define	PINCTRL_IRQEN(n)	(0x1100 + ((n) * 0x10))
+#define	PINCTRL_IRQSTAT(n)	(0x1400 + ((n) * 0x10))
+#else
+#error "Please select CONFIG_MX23 or CONFIG_MX28"
+#endif
+
+#define GPIO_INT_FALL_EDGE	0x0
+#define GPIO_INT_LOW_LEV	0x1
+#define GPIO_INT_RISE_EDGE	0x2
+#define GPIO_INT_HIGH_LEV	0x3
+#define GPIO_INT_LEV_MASK	(1 << 0)
+#define GPIO_INT_POL_MASK	(1 << 1)
+
+void mxs_gpio_init(void)
+{
+	int i;
+
+	for (i = 0; i < PINCTRL_BANKS; i++) {
+		writel(0, MXS_PINCTRL_BASE + PINCTRL_PIN2IRQ(i));
+		writel(0, MXS_PINCTRL_BASE + PINCTRL_IRQEN(i));
+		/* Use SCT address here to clear the IRQSTAT bits */
+		writel(0xffffffff, MXS_PINCTRL_BASE + PINCTRL_IRQSTAT(i) + 8);
+	}
+}
+
+int gpio_get_value(unsigned gpio)
+{
+	uint32_t bank = PAD_BANK(gpio);
+	uint32_t offset = PINCTRL_DIN(bank);
+	struct mxs_register_32 *reg =
+		(struct mxs_register_32 *)(MXS_PINCTRL_BASE + offset);
+
+	return (readl(&reg->reg) >> PAD_PIN(gpio)) & 1;
+}
+
+void gpio_set_value(unsigned gpio, int value)
+{
+	uint32_t bank = PAD_BANK(gpio);
+	uint32_t offset = PINCTRL_DOUT(bank);
+	struct mxs_register_32 *reg =
+		(struct mxs_register_32 *)(MXS_PINCTRL_BASE + offset);
+
+	if (value)
+		writel(1 << PAD_PIN(gpio), &reg->reg_set);
+	else
+		writel(1 << PAD_PIN(gpio), &reg->reg_clr);
+}
+
+int gpio_direction_input(unsigned gpio)
+{
+	uint32_t bank = PAD_BANK(gpio);
+	uint32_t offset = PINCTRL_DOE(bank);
+	struct mxs_register_32 *reg =
+		(struct mxs_register_32 *)(MXS_PINCTRL_BASE + offset);
+
+	writel(1 << PAD_PIN(gpio), &reg->reg_clr);
+
+	return 0;
+}
+
+int gpio_direction_output(unsigned gpio, int value)
+{
+	uint32_t bank = PAD_BANK(gpio);
+	uint32_t offset = PINCTRL_DOE(bank);
+	struct mxs_register_32 *reg =
+		(struct mxs_register_32 *)(MXS_PINCTRL_BASE + offset);
+
+	gpio_set_value(gpio, value);
+
+	writel(1 << PAD_PIN(gpio), &reg->reg_set);
+
+	return 0;
+}
+
+int gpio_request(unsigned gpio, const char *label)
+{
+	if (PAD_BANK(gpio) >= PINCTRL_BANKS)
+		return -1;
+
+	return 0;
+}
+
+int gpio_free(unsigned gpio)
+{
+	return 0;
+}
+
+int name_to_gpio(const char *name)
+{
+	unsigned bank, pin;
+	char *end;
+
+	bank = simple_strtoul(name, &end, 10);
+
+	if (!*end || *end != ':')
+		return bank;
+
+	pin = simple_strtoul(end + 1, NULL, 10);
+
+	return (bank << MXS_PAD_BANK_SHIFT) | (pin << MXS_PAD_PIN_SHIFT);
+}