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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*/
#define LOG_CATEGORY UCLASS_TPM
#include <common.h>
#include <dm.h>
#include <log.h>
#include <tpm_api.h>
#include <tpm-v1.h>
#include <tpm-v2.h>
#include <dm/lists.h>
#include <linux/delay.h>
#include <linux/unaligned/be_byteshift.h>
#include "tpm_internal.h"
#define TPM_RNG_DRV_NAME "tpm-rng"
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 = 0;
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) {
log_debug("no data\n");
return -ENODATA;
}
if (count > send_size) {
log_debug("invalid count value %x %zx\n", count, send_size);
return -E2BIG;
}
log_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);
if (ret) {
if (ops->cleanup) {
ret2 = ops->cleanup(dev);
if (ret2)
return log_msg_ret("cleanup", ret2);
}
return log_msg_ret("xfer", ret);
}
return 0;
}
static int tpm_uclass_post_probe(struct udevice *dev)
{
int ret;
const char *drv = TPM_RNG_DRV_NAME;
struct udevice *child;
if (CONFIG_IS_ENABLED(TPM_RNG)) {
ret = device_find_first_child_by_uclass(dev, UCLASS_RNG,
&child);
if (ret != -ENODEV) {
log_debug("RNG child already added to the TPM device\n");
return ret;
}
ret = device_bind_driver(dev, drv, TPM_RNG_DRV_NAME, &child);
if (ret)
return log_msg_ret("bind", ret);
}
return 0;
}
UCLASS_DRIVER(tpm) = {
.id = UCLASS_TPM,
.name = "tpm",
.flags = DM_UC_FLAG_SEQ_ALIAS,
#if CONFIG_IS_ENABLED(OF_REAL)
.post_bind = dm_scan_fdt_dev,
#endif
.post_probe = tpm_uclass_post_probe,
.per_device_auto = sizeof(struct tpm_chip_priv),
};
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