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/usb/ulpi/Kconfig

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+comment "ULPI drivers"
+
+choice
+	prompt "ULPI Viewport type"
+	optional
+	default n
+	help
+	  Select ULPI viewport (SoC-side interface to ULPI) implementation
+	  appropriate for the device if you want to communicate with
+	  UTMI (USB PHY) via ULPI interface.
+
+config USB_ULPI_VIEWPORT
+	bool "Generic ULPI Viewport"
+	help
+	  Support generic ULPI Viewport implementation that is used on
+	  some Tegra and Snapdragon devices.
+
+config USB_ULPI_VIEWPORT_OMAP
+	bool "OMAP ULPI Viewport"
+	help
+	  Support ULPI Viewport implementation that is used on OMAP devices.
+
+endchoice
+
+config USB_ULPI
+	bool "ULPI support"
+	depends on (USB_ULPI_VIEWPORT || USB_ULPI_VIEWPORT_OMAP)
+	help
+	  Select to commnicate with USB PHY via ULPI interface.
+	  ULPI is wrapper on UTMI+ core that is used as
+	  PHY Transreceiver for USB controllers.
+
+	  This driver uses ULPI viewports that are specific for each SoC.

u-boot/drivers/usb/ulpi/Makefile

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+#
+# Copyright (C) 2011 Jana Rapava <fermata7@gmail.com>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-$(CONFIG_USB_ULPI)		+= ulpi.o
+obj-$(CONFIG_USB_ULPI_VIEWPORT)	+= ulpi-viewport.o
+obj-$(CONFIG_USB_ULPI_VIEWPORT_OMAP)	+= omap-ulpi-viewport.o

u-boot/drivers/usb/ulpi/omap-ulpi-viewport.c

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+/*
+ * OMAP ulpi viewport support
+ * Based on drivers/usb/ulpi/ulpi-viewport.c
+ *
+ * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com
+ * Author: Govindraj R <govindraj.raja@ti.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <usb/ulpi.h>
+
+#define OMAP_ULPI_WR_OPSEL	(2 << 22)
+#define OMAP_ULPI_RD_OPSEL	(3 << 22)
+#define OMAP_ULPI_START		(1 << 31)
+
+/*
+ * Wait for having ulpi in done state
+ */
+static int ulpi_wait(struct ulpi_viewport *ulpi_vp, u32 mask)
+{
+	int timeout = CONFIG_USB_ULPI_TIMEOUT;
+
+	while (--timeout) {
+		if (!(readl(ulpi_vp->viewport_addr) & mask))
+			return 0;
+
+		udelay(1);
+	}
+
+	return ULPI_ERROR;
+}
+
+/*
+ * Issue a ULPI read/write request
+ */
+static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value)
+{
+	int err;
+
+	writel(value, ulpi_vp->viewport_addr);
+
+	err = ulpi_wait(ulpi_vp, OMAP_ULPI_START);
+	if (err)
+		debug("ULPI request timed out\n");
+
+	return err;
+}
+
+int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value)
+{
+	u32 val = OMAP_ULPI_START | (((ulpi_vp->port_num + 1) & 0xf) << 24) |
+			OMAP_ULPI_WR_OPSEL | ((u32)reg << 16) | (value & 0xff);
+
+	return ulpi_request(ulpi_vp, val);
+}
+
+u32 ulpi_read(struct ulpi_viewport *ulpi_vp, u8 *reg)
+{
+	int err;
+	u32 val = OMAP_ULPI_START | (((ulpi_vp->port_num + 1) & 0xf) << 24) |
+			 OMAP_ULPI_RD_OPSEL | ((u32)reg << 16);
+
+	err = ulpi_request(ulpi_vp, val);
+	if (err)
+		return err;
+
+	return readl(ulpi_vp->viewport_addr) & 0xff;
+}

u-boot/drivers/usb/ulpi/ulpi-viewport.c

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+/*
+ * Copyright (C) 2011 Jana Rapava <fermata7@gmail.com>
+ * Copyright (C) 2011 CompuLab, Ltd. <www.compulab.co.il>
+ *
+ * Authors: Jana Rapava <fermata7@gmail.com>
+ *	    Igor Grinberg <grinberg@compulab.co.il>
+ *
+ * Based on:
+ * linux/drivers/usb/otg/ulpi_viewport.c
+ *
+ * Original Copyright follow:
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <usb/ulpi.h>
+
+/* ULPI viewport control bits */
+#define ULPI_SS		(1 << 27)
+#define ULPI_RWCTRL	(1 << 29)
+#define ULPI_RWRUN	(1 << 30)
+#define ULPI_WU		(1 << 31)
+
+/*
+ * Wait for the ULPI request to complete
+ *
+ * @ulpi_viewport	- the address of the viewport
+ * @mask		- expected value to wait for
+ *
+ * returns 0 on mask match, ULPI_ERROR on time out.
+ */
+static int ulpi_wait(struct ulpi_viewport *ulpi_vp, u32 mask)
+{
+	int timeout = CONFIG_USB_ULPI_TIMEOUT;
+
+	/* Wait for the bits in mask to become zero. */
+	while (--timeout) {
+		if ((readl(ulpi_vp->viewport_addr) & mask) == 0)
+			return 0;
+
+		udelay(1);
+	}
+
+	return ULPI_ERROR;
+}
+
+/*
+ * Wake the ULPI PHY up for communication
+ *
+ * returns 0 on success.
+ */
+static int ulpi_wakeup(struct ulpi_viewport *ulpi_vp)
+{
+	int err;
+
+	if (readl(ulpi_vp->viewport_addr) & ULPI_SS)
+		return 0; /* already awake */
+
+	writel(ULPI_WU, ulpi_vp->viewport_addr);
+
+	err = ulpi_wait(ulpi_vp, ULPI_WU);
+	if (err)
+		printf("ULPI wakeup timed out\n");
+
+	return err;
+}
+
+/*
+ * Issue a ULPI read/write request
+ *
+ * @value - the ULPI request
+ */
+static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value)
+{
+	int err;
+
+	err = ulpi_wakeup(ulpi_vp);
+	if (err)
+		return err;
+
+	writel(value, ulpi_vp->viewport_addr);
+
+	err = ulpi_wait(ulpi_vp, ULPI_RWRUN);
+	if (err)
+		printf("ULPI request timed out\n");
+
+	return err;
+}
+
+int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value)
+{
+	u32 addr = (uintptr_t)reg & 0xFF;
+	u32 val = ULPI_RWRUN | ULPI_RWCTRL | addr << 16 | (value & 0xff);
+
+	val |= (ulpi_vp->port_num & 0x7) << 24;
+	return ulpi_request(ulpi_vp, val);
+}
+
+u32 ulpi_read(struct ulpi_viewport *ulpi_vp, u8 *reg)
+{
+	int err;
+	u32 val = ULPI_RWRUN | ((uintptr_t)reg & 0xFF) << 16;
+
+	val |= (ulpi_vp->port_num & 0x7) << 24;
+	err = ulpi_request(ulpi_vp, val);
+	if (err)
+		return err;
+
+	return (readl(ulpi_vp->viewport_addr) >> 8) & 0xff;
+}

u-boot/drivers/usb/ulpi/ulpi.c

@@ -0,0 +1,245 @@
+/*
+ * Copyright (C) 2011 Jana Rapava <fermata7@gmail.com>
+ * Copyright (C) 2011 CompuLab, Ltd. <www.compulab.co.il>
+ *
+ * Authors: Jana Rapava <fermata7@gmail.com>
+ *	    Igor Grinberg <grinberg@compulab.co.il>
+ *
+ * Based on:
+ * linux/drivers/usb/otg/ulpi.c
+ * Generic ULPI USB transceiver support
+ *
+ * Original Copyright follow:
+ * Copyright (C) 2009 Daniel Mack <daniel@caiaq.de>
+ *
+ * Based on sources from
+ *
+ *   Sascha Hauer <s.hauer@pengutronix.de>
+ *   Freescale Semiconductors
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <exports.h>
+#include <usb/ulpi.h>
+
+#define ULPI_ID_REGS_COUNT	4
+#define ULPI_TEST_VALUE		0x55	/* 0x55 == 0b01010101 */
+
+static struct ulpi_regs *ulpi = (struct ulpi_regs *)0;
+
+static int ulpi_integrity_check(struct ulpi_viewport *ulpi_vp)
+{
+	u32 val, tval = ULPI_TEST_VALUE;
+	int err, i;
+
+	/* Use the 'special' test value to check all bits */
+	for (i = 0; i < 2; i++, tval <<= 1) {
+		err = ulpi_write(ulpi_vp, &ulpi->scratch, tval);
+		if (err)
+			return err;
+
+		val = ulpi_read(ulpi_vp, &ulpi->scratch);
+		if (val != tval) {
+			printf("ULPI integrity check failed\n");
+			return val;
+		}
+	}
+
+	return 0;
+}
+
+int ulpi_init(struct ulpi_viewport *ulpi_vp)
+{
+	u32 val, id = 0;
+	u8 *reg = &ulpi->product_id_high;
+	int i;
+
+	/* Assemble ID from four ULPI ID registers (8 bits each). */
+	for (i = 0; i < ULPI_ID_REGS_COUNT; i++) {
+		val = ulpi_read(ulpi_vp, reg - i);
+		if (val == ULPI_ERROR)
+			return val;
+
+		id = (id << 8) | val;
+	}
+
+	/* Split ID into vendor and product ID. */
+	debug("ULPI transceiver ID 0x%04x:0x%04x\n", id >> 16, id & 0xffff);
+
+	return ulpi_integrity_check(ulpi_vp);
+}
+
+int ulpi_select_transceiver(struct ulpi_viewport *ulpi_vp, unsigned speed)
+{
+	u32 tspeed = ULPI_FC_FULL_SPEED;
+	u32 val;
+
+	switch (speed) {
+	case ULPI_FC_HIGH_SPEED:
+	case ULPI_FC_FULL_SPEED:
+	case ULPI_FC_LOW_SPEED:
+	case ULPI_FC_FS4LS:
+		tspeed = speed;
+		break;
+	default:
+		printf("ULPI: %s: wrong transceiver speed specified: %u, "
+			"falling back to full speed\n", __func__, speed);
+	}
+
+	val = ulpi_read(ulpi_vp, &ulpi->function_ctrl);
+	if (val == ULPI_ERROR)
+		return val;
+
+	/* clear the previous speed setting */
+	val = (val & ~ULPI_FC_XCVRSEL_MASK) | tspeed;
+
+	return ulpi_write(ulpi_vp, &ulpi->function_ctrl, val);
+}
+
+int ulpi_set_vbus(struct ulpi_viewport *ulpi_vp, int on, int ext_power)
+{
+	u32 flags = ULPI_OTG_DRVVBUS;
+	u8 *reg = on ? &ulpi->otg_ctrl_set : &ulpi->otg_ctrl_clear;
+
+	if (ext_power)
+		flags |= ULPI_OTG_DRVVBUS_EXT;
+
+	return ulpi_write(ulpi_vp, reg, flags);
+}
+
+int ulpi_set_vbus_indicator(struct ulpi_viewport *ulpi_vp, int external,
+			int passthu, int complement)
+{
+	u32 flags, val;
+	u8 *reg;
+
+	reg = external ? &ulpi->otg_ctrl_set : &ulpi->otg_ctrl_clear;
+	val = ulpi_write(ulpi_vp, reg, ULPI_OTG_EXTVBUSIND);
+	if (val)
+		return val;
+
+	flags = passthu ? ULPI_IFACE_PASSTHRU : 0;
+	flags |= complement ? ULPI_IFACE_EXTVBUS_COMPLEMENT : 0;
+
+	val = ulpi_read(ulpi_vp, &ulpi->iface_ctrl);
+	if (val == ULPI_ERROR)
+		return val;
+
+	val = val & ~(ULPI_IFACE_PASSTHRU & ULPI_IFACE_EXTVBUS_COMPLEMENT);
+	val |= flags;
+	val = ulpi_write(ulpi_vp, &ulpi->iface_ctrl, val);
+	if (val)
+		return val;
+
+	return 0;
+}
+
+int ulpi_set_pd(struct ulpi_viewport *ulpi_vp, int enable)
+{
+	u32 val = ULPI_OTG_DP_PULLDOWN | ULPI_OTG_DM_PULLDOWN;
+	u8 *reg = enable ? &ulpi->otg_ctrl_set : &ulpi->otg_ctrl_clear;
+
+	return ulpi_write(ulpi_vp, reg, val);
+}
+
+int ulpi_opmode_sel(struct ulpi_viewport *ulpi_vp, unsigned opmode)
+{
+	u32 topmode = ULPI_FC_OPMODE_NORMAL;
+	u32 val;
+
+	switch (opmode) {
+	case ULPI_FC_OPMODE_NORMAL:
+	case ULPI_FC_OPMODE_NONDRIVING:
+	case ULPI_FC_OPMODE_DISABLE_NRZI:
+	case ULPI_FC_OPMODE_NOSYNC_NOEOP:
+		topmode = opmode;
+		break;
+	default:
+		printf("ULPI: %s: wrong OpMode specified: %u, "
+			"falling back to OpMode Normal\n", __func__, opmode);
+	}
+
+	val = ulpi_read(ulpi_vp, &ulpi->function_ctrl);
+	if (val == ULPI_ERROR)
+		return val;
+
+	/* clear the previous opmode setting */
+	val = (val & ~ULPI_FC_OPMODE_MASK) | topmode;
+
+	return ulpi_write(ulpi_vp, &ulpi->function_ctrl, val);
+}
+
+int ulpi_serial_mode_enable(struct ulpi_viewport *ulpi_vp, unsigned smode)
+{
+	switch (smode) {
+	case ULPI_IFACE_6_PIN_SERIAL_MODE:
+	case ULPI_IFACE_3_PIN_SERIAL_MODE:
+		break;
+	default:
+		printf("ULPI: %s: unrecognized Serial Mode specified: %u\n",
+			__func__, smode);
+		return ULPI_ERROR;
+	}
+
+	return ulpi_write(ulpi_vp, &ulpi->iface_ctrl_set, smode);
+}
+
+int ulpi_suspend(struct ulpi_viewport *ulpi_vp)
+{
+	int err;
+
+	err = ulpi_write(ulpi_vp, &ulpi->function_ctrl_clear,
+			ULPI_FC_SUSPENDM);
+	if (err)
+		printf("ULPI: %s: failed writing the suspend bit\n", __func__);
+
+	return err;
+}
+
+/*
+ * Wait for ULPI PHY reset to complete.
+ * Actual wait for reset must be done in a view port specific way,
+ * because it involves checking the DIR line.
+ */
+static int __ulpi_reset_wait(struct ulpi_viewport *ulpi_vp)
+{
+	u32 val;
+	int timeout = CONFIG_USB_ULPI_TIMEOUT;
+
+	/* Wait for the RESET bit to become zero */
+	while (--timeout) {
+		/*
+		 * This function is generic and suppose to work
+		 * with any viewport, so we cheat here and don't check
+		 * for the error of ulpi_read(), if there is one, then
+		 * there will be a timeout.
+		 */
+		val = ulpi_read(ulpi_vp, &ulpi->function_ctrl);
+		if (!(val & ULPI_FC_RESET))
+			return 0;
+
+		udelay(1);
+	}
+
+	printf("ULPI: %s: reset timed out\n", __func__);
+
+	return ULPI_ERROR;
+}
+int ulpi_reset_wait(struct ulpi_viewport *ulpi_vp)
+	__attribute__((weak, alias("__ulpi_reset_wait")));
+
+int ulpi_reset(struct ulpi_viewport *ulpi_vp)
+{
+	int err;
+
+	err = ulpi_write(ulpi_vp,
+			&ulpi->function_ctrl_set, ULPI_FC_RESET);
+	if (err) {
+		printf("ULPI: %s: failed writing reset bit\n", __func__);
+		return err;
+	}
+
+	return ulpi_reset_wait(ulpi_vp);
+}