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/board/nvidia/cardhu/cardhu.c

@@ -0,0 +1,131 @@
+/*
+ *  (C) Copyright 2010-2013
+ *  NVIDIA Corporation <www.nvidia.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <asm/arch/pinmux.h>
+#include <asm/arch/gp_padctrl.h>
+#include <asm/arch/gpio.h>
+#include <asm/gpio.h>
+#include "pinmux-config-cardhu.h"
+#include <i2c.h>
+
+#define PMU_I2C_ADDRESS		0x2D
+#define MAX_I2C_RETRY		3
+
+/*
+ * Routine: pinmux_init
+ * Description: Do individual peripheral pinmux configs
+ */
+void pinmux_init(void)
+{
+	pinmux_config_pingrp_table(tegra3_pinmux_common,
+		ARRAY_SIZE(tegra3_pinmux_common));
+
+	pinmux_config_pingrp_table(unused_pins_lowpower,
+		ARRAY_SIZE(unused_pins_lowpower));
+
+	/* Initialize any non-default pad configs (APB_MISC_GP regs) */
+	pinmux_config_drvgrp_table(cardhu_padctrl, ARRAY_SIZE(cardhu_padctrl));
+}
+
+#if defined(CONFIG_TEGRA_MMC)
+/*
+ * Do I2C/PMU writes to bring up SD card bus power
+ *
+ */
+void board_sdmmc_voltage_init(void)
+{
+	struct udevice *dev;
+	uchar reg, data_buffer[1];
+	int ret;
+	int i;
+
+	ret = i2c_get_chip_for_busnum(0, PMU_I2C_ADDRESS, 1, &dev);
+	if (ret) {
+		debug("%s: Cannot find PMIC I2C chip\n", __func__);
+		return;
+	}
+
+	/* TPS659110: LDO5_REG = 3.3v, ACTIVE to SDMMC1 */
+	data_buffer[0] = 0x65;
+	reg = 0x32;
+
+	for (i = 0; i < MAX_I2C_RETRY; ++i) {
+		if (dm_i2c_write(dev, reg, data_buffer, 1))
+			udelay(100);
+	}
+
+	/* TPS659110: GPIO7_REG = PDEN, output a 1 to EN_3V3_SYS */
+	data_buffer[0] = 0x09;
+	reg = 0x67;
+
+	for (i = 0; i < MAX_I2C_RETRY; ++i) {
+		if (dm_i2c_write(dev, reg, data_buffer, 1))
+			udelay(100);
+	}
+}
+
+/*
+ * Routine: pin_mux_mmc
+ * Description: setup the MMC muxes, power rails, etc.
+ */
+void pin_mux_mmc(void)
+{
+	/*
+	 * NOTE: We don't do mmc-specific pin muxes here.
+	 * They were done globally in pinmux_init().
+	 */
+
+	/* Bring up the SDIO1 power rail */
+	board_sdmmc_voltage_init();
+}
+#endif	/* MMC */
+
+#ifdef CONFIG_PCI_TEGRA
+int tegra_pcie_board_init(void)
+{
+	struct udevice *dev;
+	u8 addr, data[1];
+	int err;
+
+	err = i2c_get_chip_for_busnum(0, PMU_I2C_ADDRESS, 1, &dev);
+	if (err) {
+		debug("failed to find PMU bus\n");
+		return err;
+	}
+
+	/* TPS659110: LDO1_REG = 1.05V, ACTIVE */
+	data[0] = 0x15;
+	addr = 0x30;
+
+	err = dm_i2c_write(dev, addr, data, 1);
+	if (err) {
+		debug("failed to set VDD supply\n");
+		return err;
+	}
+
+	/* GPIO: PEX = 3.3V */
+	err = gpio_request(TEGRA_GPIO(L, 7), "PEX");
+	if (err < 0)
+		return err;
+
+	gpio_direction_output(TEGRA_GPIO(L, 7), 1);
+
+	/* TPS659110: LDO2_REG = 1.05V, ACTIVE */
+	data[0] = 0x15;
+	addr = 0x31;
+
+	err = dm_i2c_write(dev, addr, data, 1);
+	if (err) {
+		debug("failed to set AVDD supply\n");
+		return err;
+	}
+
+	return 0;
+}
+#endif /* PCI */