mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-23 11:33:32 +00:00
185f812c41
Sphinx expects Return: and not @return to indicate a return value.
find . -name '*.c' -exec \
sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \;
find . -name '*.h' -exec \
sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \;
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
159 lines
3.6 KiB
C
159 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2013 Guntermann & Drunck, GmbH
|
|
*
|
|
* Written by Dirk Eibach <dirk.eibach@gdsys.cc>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <tpm-v1.h>
|
|
#include <i2c.h>
|
|
#include <asm/unaligned.h>
|
|
#include <linux/delay.h>
|
|
|
|
#include "tpm_internal.h"
|
|
|
|
#define ATMEL_TPM_TIMEOUT_MS 5000 /* sufficient for anything but
|
|
generating/exporting keys */
|
|
|
|
/*
|
|
* tpm_atmel_twi_open()
|
|
*
|
|
* Requests access to locality 0 for the caller. After all commands have been
|
|
* completed the caller is supposed to call tis_close().
|
|
*
|
|
* Returns 0 on success, -1 on failure.
|
|
*/
|
|
static int tpm_atmel_twi_open(struct udevice *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* tpm_atmel_twi_close()
|
|
*
|
|
* terminate the currect session with the TPM by releasing the locked
|
|
* locality. Returns 0 on success of -1 on failure (in case lock
|
|
* removal did not succeed).
|
|
*/
|
|
static int tpm_atmel_twi_close(struct udevice *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* tpm_atmel_twi_get_desc()
|
|
*
|
|
* @dev: Device to check
|
|
* @buf: Buffer to put the string
|
|
* @size: Maximum size of buffer
|
|
* Return: length of string, or -ENOSPC it no space
|
|
*/
|
|
static int tpm_atmel_twi_get_desc(struct udevice *dev, char *buf, int size)
|
|
{
|
|
if (size < 50)
|
|
return -ENOSPC;
|
|
|
|
return snprintf(buf, size, "Atmel AT97SC3204T I2C 1.2 TPM (%s)", dev->name);
|
|
}
|
|
|
|
/*
|
|
* tpm_atmel_twi_xfer()
|
|
*
|
|
* Send the requested data to the TPM and then try to get its response
|
|
*
|
|
* @sendbuf - buffer of the data to send
|
|
* @send_size size of the data to send
|
|
* @recvbuf - memory to save the response to
|
|
* @recv_len - pointer to the size of the response buffer
|
|
*
|
|
* Returns 0 on success (and places the number of response bytes at recv_len)
|
|
* or -1 on failure.
|
|
*/
|
|
static int tpm_atmel_twi_xfer(struct udevice *dev,
|
|
const uint8_t *sendbuf, size_t send_size,
|
|
uint8_t *recvbuf, size_t *recv_len)
|
|
{
|
|
int res;
|
|
unsigned long start;
|
|
|
|
#ifdef DEBUG
|
|
memset(recvbuf, 0xcc, *recv_len);
|
|
printf("send to TPM (%d bytes, recv_len=%d):\n", send_size, *recv_len);
|
|
print_buffer(0, (void *)sendbuf, 1, send_size, 0);
|
|
#endif
|
|
|
|
res = dm_i2c_write(dev, 0, sendbuf, send_size);
|
|
if (res) {
|
|
printf("i2c_write returned %d\n", res);
|
|
return -1;
|
|
}
|
|
|
|
start = get_timer(0);
|
|
|
|
while ((res = dm_i2c_read(dev, 0, recvbuf, 10)))
|
|
{
|
|
/* TODO Use TIS_TIMEOUT from tpm_tis_infineon.h */
|
|
if (get_timer(start) > ATMEL_TPM_TIMEOUT_MS) {
|
|
puts("tpm timed out\n");
|
|
return -1;
|
|
}
|
|
udelay(100);
|
|
}
|
|
if (!res) {
|
|
unsigned int hdr_recv_len;
|
|
hdr_recv_len = get_unaligned_be32(recvbuf + 2);
|
|
if (hdr_recv_len < 10) {
|
|
puts("tpm response header too small\n");
|
|
return -1;
|
|
} else if (hdr_recv_len > *recv_len) {
|
|
puts("tpm response length is bigger than receive buffer\n");
|
|
return -1;
|
|
} else {
|
|
*recv_len = hdr_recv_len;
|
|
res = dm_i2c_read(dev, 0, recvbuf, *recv_len);
|
|
}
|
|
}
|
|
if (res) {
|
|
printf("i2c_read returned %d (rlen=%zu)\n", res, *recv_len);
|
|
#ifdef DEBUG
|
|
print_buffer(0, recvbuf, 1, *recv_len, 0);
|
|
#endif
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
if (!res) {
|
|
printf("read from TPM (%d bytes):\n", *recv_len);
|
|
print_buffer(0, recvbuf, 1, *recv_len, 0);
|
|
}
|
|
#endif
|
|
|
|
return res;
|
|
}
|
|
|
|
static int tpm_atmel_twi_probe(struct udevice *dev)
|
|
{
|
|
i2c_set_chip_offset_len(dev, 0);
|
|
return 0;
|
|
}
|
|
|
|
static const struct udevice_id tpm_atmel_twi_ids[] = {
|
|
{ .compatible = "atmel,at97sc3204t"},
|
|
{ }
|
|
};
|
|
|
|
static const struct tpm_ops tpm_atmel_twi_ops = {
|
|
.open = tpm_atmel_twi_open,
|
|
.close = tpm_atmel_twi_close,
|
|
.xfer = tpm_atmel_twi_xfer,
|
|
.get_desc = tpm_atmel_twi_get_desc,
|
|
};
|
|
|
|
U_BOOT_DRIVER(tpm_atmel_twi) = {
|
|
.name = "tpm_atmel_twi",
|
|
.id = UCLASS_TPM,
|
|
.of_match = tpm_atmel_twi_ids,
|
|
.ops = &tpm_atmel_twi_ops,
|
|
.probe = tpm_atmel_twi_probe,
|
|
};
|