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/tpm/tpm-uclass.c

@@ -0,0 +1,133 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <tpm.h>
+#include <linux/unaligned/be_byteshift.h>
+#include "tpm_internal.h"
+
+int tpm_open(struct udevice *dev)
+{
+	struct tpm_ops *ops = tpm_get_ops(dev);
+
+	if (!ops->open)
+		return -ENOSYS;
+
+	return ops->open(dev);
+}
+
+int tpm_close(struct udevice *dev)
+{
+	struct tpm_ops *ops = tpm_get_ops(dev);
+
+	if (!ops->close)
+		return -ENOSYS;
+
+	return ops->close(dev);
+}
+
+int tpm_get_desc(struct udevice *dev, char *buf, int size)
+{
+	struct tpm_ops *ops = tpm_get_ops(dev);
+
+	if (!ops->get_desc)
+		return -ENOSYS;
+
+	return ops->get_desc(dev, buf, size);
+}
+
+/* Returns max number of milliseconds to wait */
+static ulong tpm_tis_i2c_calc_ordinal_duration(struct tpm_chip_priv *priv,
+					       u32 ordinal)
+{
+	int duration_idx = TPM_UNDEFINED;
+	int duration = 0;
+
+	if (ordinal < TPM_MAX_ORDINAL) {
+		duration_idx = tpm_ordinal_duration[ordinal];
+	} else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
+			TPM_MAX_PROTECTED_ORDINAL) {
+		duration_idx = tpm_protected_ordinal_duration[
+				ordinal & TPM_PROTECTED_ORDINAL_MASK];
+	}
+
+	if (duration_idx != TPM_UNDEFINED)
+		duration = priv->duration_ms[duration_idx];
+
+	if (duration <= 0)
+		return 2 * 60 * 1000; /* Two minutes timeout */
+	else
+		return duration;
+}
+
+int tpm_xfer(struct udevice *dev, const uint8_t *sendbuf, size_t send_size,
+	uint8_t *recvbuf, size_t *recv_size)
+{
+	struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
+	struct tpm_ops *ops = tpm_get_ops(dev);
+	ulong start, stop;
+	uint count, ordinal;
+	int ret, ret2;
+
+	if (ops->xfer)
+		return ops->xfer(dev, sendbuf, send_size, recvbuf, recv_size);
+
+	if (!ops->send || !ops->recv)
+		return -ENOSYS;
+
+	/* switch endianess: big->little */
+	count = get_unaligned_be32(sendbuf + TPM_CMD_COUNT_BYTE);
+	ordinal = get_unaligned_be32(sendbuf + TPM_CMD_ORDINAL_BYTE);
+
+	if (count == 0) {
+		debug("no data\n");
+		return -ENODATA;
+	}
+	if (count > send_size) {
+		debug("invalid count value %x %zx\n", count, send_size);
+		return -E2BIG;
+	}
+
+	debug("%s: Calling send\n", __func__);
+	ret = ops->send(dev, sendbuf, send_size);
+	if (ret < 0)
+		return ret;
+
+	start = get_timer(0);
+	stop = tpm_tis_i2c_calc_ordinal_duration(priv, ordinal);
+	do {
+		ret = ops->recv(dev, priv->buf, sizeof(priv->buf));
+		if (ret >= 0) {
+			if (ret > *recv_size)
+				return -ENOSPC;
+			memcpy(recvbuf, priv->buf, ret);
+			*recv_size = ret;
+			ret = 0;
+			break;
+		} else if (ret != -EAGAIN) {
+			return ret;
+		}
+
+		mdelay(priv->retry_time_ms);
+		if (get_timer(start) > stop) {
+			ret = -ETIMEDOUT;
+			break;
+		}
+	} while (ret);
+
+	ret2 = ops->cleanup ? ops->cleanup(dev) : 0;
+
+	return ret2 ? ret2 : ret;
+}
+
+UCLASS_DRIVER(tpm) = {
+	.id             = UCLASS_TPM,
+	.name           = "tpm",
+	.flags          = DM_UC_FLAG_SEQ_ALIAS,
+	.per_device_auto_alloc_size	= sizeof(struct tpm_chip_priv),
+};