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https://github.com/brain-hackers/u-boot-brain
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2a2096ea60
While there is probably no reason to do so in a real life situation, it will allow to compile test both stacks with the same sandbox defconfig. As we cannot define two 'tpm' commands at the same time, the command for TPM v1 is still called 'tpm' and the one for TPM v2 'tpm2'. While this is the exact command name that must be written into eg. test files, any user already using the TPM v2 stack can continue to do so by just writing 'tpm' because as long as TPM v1 support is not compiled, U-Boot prompt will search for the closest command named after 'tpm'. The command set can also be changed at runtime (not supported yet, but ready to be), but as one can compile only either one stack or the other, there is still one spot in the code where conditionals are used: to retrieve the v1 or v2 command set. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Reviewed-by: Simon Glass <sjg@chromium.org> [trini: In sandbox_tpm2_fill_buf() use NULL not \0 to ensure NULL terminated string due to LLVM warning] Signed-off-by: Tom Rini <trini@konsulko.com>
134 lines
2.9 KiB
C
134 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#include <common.h>
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#include <dm.h>
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#include <linux/unaligned/be_byteshift.h>
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#include <tpm-v1.h>
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#include <tpm-v2.h>
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#include "tpm_internal.h"
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int tpm_open(struct udevice *dev)
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{
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struct tpm_ops *ops = tpm_get_ops(dev);
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if (!ops->open)
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return -ENOSYS;
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return ops->open(dev);
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}
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int tpm_close(struct udevice *dev)
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{
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struct tpm_ops *ops = tpm_get_ops(dev);
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if (!ops->close)
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return -ENOSYS;
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return ops->close(dev);
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}
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int tpm_get_desc(struct udevice *dev, char *buf, int size)
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{
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struct tpm_ops *ops = tpm_get_ops(dev);
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if (!ops->get_desc)
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return -ENOSYS;
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return ops->get_desc(dev, buf, size);
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}
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/* Returns max number of milliseconds to wait */
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static ulong tpm_tis_i2c_calc_ordinal_duration(struct tpm_chip_priv *priv,
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u32 ordinal)
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{
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int duration_idx = TPM_UNDEFINED;
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int duration = 0;
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if (ordinal < TPM_MAX_ORDINAL) {
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duration_idx = tpm_ordinal_duration[ordinal];
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} else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
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TPM_MAX_PROTECTED_ORDINAL) {
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duration_idx = tpm_protected_ordinal_duration[
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ordinal & TPM_PROTECTED_ORDINAL_MASK];
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}
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if (duration_idx != TPM_UNDEFINED)
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duration = priv->duration_ms[duration_idx];
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if (duration <= 0)
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return 2 * 60 * 1000; /* Two minutes timeout */
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else
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return duration;
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}
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int tpm_xfer(struct udevice *dev, const uint8_t *sendbuf, size_t send_size,
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uint8_t *recvbuf, size_t *recv_size)
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{
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struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
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struct tpm_ops *ops = tpm_get_ops(dev);
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ulong start, stop;
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uint count, ordinal;
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int ret, ret2;
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if (ops->xfer)
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return ops->xfer(dev, sendbuf, send_size, recvbuf, recv_size);
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if (!ops->send || !ops->recv)
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return -ENOSYS;
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/* switch endianess: big->little */
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count = get_unaligned_be32(sendbuf + TPM_CMD_COUNT_BYTE);
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ordinal = get_unaligned_be32(sendbuf + TPM_CMD_ORDINAL_BYTE);
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if (count == 0) {
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debug("no data\n");
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return -ENODATA;
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}
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if (count > send_size) {
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debug("invalid count value %x %zx\n", count, send_size);
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return -E2BIG;
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}
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debug("%s: Calling send\n", __func__);
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ret = ops->send(dev, sendbuf, send_size);
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if (ret < 0)
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return ret;
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start = get_timer(0);
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stop = tpm_tis_i2c_calc_ordinal_duration(priv, ordinal);
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do {
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ret = ops->recv(dev, priv->buf, sizeof(priv->buf));
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if (ret >= 0) {
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if (ret > *recv_size)
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return -ENOSPC;
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memcpy(recvbuf, priv->buf, ret);
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*recv_size = ret;
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ret = 0;
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break;
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} else if (ret != -EAGAIN) {
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return ret;
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}
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mdelay(priv->retry_time_ms);
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if (get_timer(start) > stop) {
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ret = -ETIMEDOUT;
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break;
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}
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} while (ret);
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ret2 = ops->cleanup ? ops->cleanup(dev) : 0;
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return ret2 ? ret2 : ret;
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}
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UCLASS_DRIVER(tpm) = {
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.id = UCLASS_TPM,
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.name = "tpm",
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.flags = DM_UC_FLAG_SEQ_ALIAS,
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.per_device_auto_alloc_size = sizeof(struct tpm_chip_priv),
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};
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