134 lines
2.9 KiB
C
134 lines
2.9 KiB
C
/*
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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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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <dm.h>
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#include <tpm.h>
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#include <linux/unaligned/be_byteshift.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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