tpm-uclass.c
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/*
* 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),
};