mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-18 18:59:44 +00:00
c89d32a7b1
Adjust the TPM drivers to use livetree (only one does not). Also, sometimes TPMs can have child devices if they provide a service to the system (such as storing secure data), so permit that. Signed-off-by: Simon Glass <sjg@chromium.org>
136 lines
3 KiB
C
136 lines
3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (c) 2015 Google, Inc
|
|
* Written by Simon Glass <sjg@chromium.org>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <linux/unaligned/be_byteshift.h>
|
|
#include <tpm-v1.h>
|
|
#include <tpm-v2.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,
|
|
#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
|
|
.post_bind = dm_scan_fdt_dev,
|
|
#endif
|
|
.per_device_auto_alloc_size = sizeof(struct tpm_chip_priv),
|
|
};
|