Commit c01939c7 authored by Dirk Eibach's avatar Dirk Eibach Committed by Andy Fleming

Add Atmel I2C tpm

Add support for Atmel TPM devices with two wire interface.
Signed-off-by: default avatarDirk Eibach <dirk.eibach@gdsys.cc>
Signed-off-by: default avatarReinhard Pfau <reinhard.pfau@gdsys.cc>
Reviewed-by: default avatarSimon Glass <sjg@chromium.org>
Signed-off-by: default avatarAndy Fleming <afleming@freescale.com>
parent b778c1b5
......@@ -1238,6 +1238,9 @@ The following options need to be configured:
CONFIG_TPM_TIS_I2C_BURST_LIMITATION
Define the burst count bytes upper limit
CONFIG_TPM_ATMEL_TWI
Support for Atmel TWI TPM device. Requires I2C support.
CONFIG_TPM_TIS_LPC
Support for generic parallel port TPM devices. Only one device
per system is supported at this time.
......
......@@ -26,6 +26,7 @@ LIB := $(obj)libtpm.o
$(shell mkdir -p $(obj)slb9635_i2c)
# TODO: Merge tpm_tis_lpc.c with tpm.c
COBJS-$(CONFIG_TPM_ATMEL_TWI) += tpm_atmel_twi.o
COBJS-$(CONFIG_TPM_TIS_I2C) += tpm.o
COBJS-$(CONFIG_TPM_TIS_I2C) += tpm_tis_i2c.o
COBJS-$(CONFIG_TPM_TIS_LPC) += tpm_tis_lpc.o
......
/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <tpm.h>
#include <i2c.h>
#include <asm/unaligned.h>
#define ATMEL_TPM_TIMEOUT_MS 5000 /* sufficient for anything but
generating/exporting keys */
/*
* tis_init()
*
* Initialize the TPM device. Returns 0 on success or -1 on
* failure (in case device probing did not succeed).
*/
int tis_init(void)
{
return 0;
}
/*
* tis_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.
*/
int tis_open(void)
{
return 0;
}
/*
* tis_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).
*/
int tis_close(void)
{
return 0;
}
/*
* tis_sendrecv()
*
* 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.
*/
int tis_sendrecv(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 = i2c_write(0x29, 0, 0, (uchar *)sendbuf, send_size);
if (res) {
printf("i2c_write returned %d\n", res);
return -1;
}
start = get_timer(0);
while ((res = i2c_read(0x29, 0, 0, recvbuf, 10))) {
if (get_timer(start) > ATMEL_TPM_TIMEOUT_MS) {
puts("tpm timed out\n");
return -1;
}
udelay(100);
}
if (!res) {
*recv_len = get_unaligned_be32(recvbuf + 2);
if (*recv_len > 10)
res = i2c_read(0x29, 0, 0, recvbuf, *recv_len);
}
if (res) {
printf("i2c_read returned %d (rlen=%d)\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;
}
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment