mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 00:47:26 +00:00
ec34fa5e43
Add support for Infineon's new SLB 9645 TT 1.2 I2C TPMs, which supports clockstretching, combined reads and a bus speed of up to 400khz. The device also has a new device id. This is based on the kernel patch provided by Infineon : https://gerrit.chromium.org/gerrit/42332 Signed-off-by: Vincent Palatin <vpalatin@chromium.org> Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Luigi Semenzato <semenzato@chromium.org> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Vincent Palatin <vpalatin@chromium.org> Tested-by: Tom Wai-Hong Tam <waihong@chromium.org> Tested-by: Vincent Palatin <vpalatin@chromium.org>
185 lines
3 KiB
C
185 lines
3 KiB
C
/*
|
|
* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*/
|
|
|
|
#include <config.h>
|
|
#include <common.h>
|
|
#include <fdtdec.h>
|
|
#include <i2c.h>
|
|
#include "slb9635_i2c/tpm.h"
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
/* TPM configuration */
|
|
struct tpm {
|
|
int i2c_bus;
|
|
int slave_addr;
|
|
char inited;
|
|
int old_bus;
|
|
} tpm;
|
|
|
|
|
|
static int tpm_select(void)
|
|
{
|
|
int ret;
|
|
|
|
tpm.old_bus = i2c_get_bus_num();
|
|
if (tpm.old_bus != tpm.i2c_bus) {
|
|
ret = i2c_set_bus_num(tpm.i2c_bus);
|
|
if (ret) {
|
|
debug("%s: Fail to set i2c bus %d\n", __func__,
|
|
tpm.i2c_bus);
|
|
return -1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int tpm_deselect(void)
|
|
{
|
|
int ret;
|
|
|
|
if (tpm.old_bus != i2c_get_bus_num()) {
|
|
ret = i2c_set_bus_num(tpm.old_bus);
|
|
if (ret) {
|
|
debug("%s: Fail to restore i2c bus %d\n",
|
|
__func__, tpm.old_bus);
|
|
return -1;
|
|
}
|
|
}
|
|
tpm.old_bus = -1;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Decode TPM configuration.
|
|
*
|
|
* @param dev Returns a configuration of TPM device
|
|
* @return 0 if ok, -1 on error
|
|
*/
|
|
static int tpm_decode_config(struct tpm *dev)
|
|
{
|
|
#ifdef CONFIG_OF_CONTROL
|
|
const void *blob = gd->fdt_blob;
|
|
int node, parent;
|
|
int i2c_bus;
|
|
|
|
node = fdtdec_next_compatible(blob, 0, COMPAT_INFINEON_SLB9635_TPM);
|
|
if (node < 0) {
|
|
node = fdtdec_next_compatible(blob, 0,
|
|
COMPAT_INFINEON_SLB9645_TPM);
|
|
}
|
|
if (node < 0) {
|
|
debug("%s: Node not found\n", __func__);
|
|
return -1;
|
|
}
|
|
parent = fdt_parent_offset(blob, node);
|
|
if (parent < 0) {
|
|
debug("%s: Cannot find node parent\n", __func__);
|
|
return -1;
|
|
}
|
|
i2c_bus = i2c_get_bus_num_fdt(parent);
|
|
if (i2c_bus < 0)
|
|
return -1;
|
|
dev->i2c_bus = i2c_bus;
|
|
dev->slave_addr = fdtdec_get_addr(blob, node, "reg");
|
|
#else
|
|
dev->i2c_bus = CONFIG_INFINEON_TPM_I2C_BUS;
|
|
dev->slave_addr = CONFIG_INFINEON_TPM_I2C_ADDR;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
int tis_init(void)
|
|
{
|
|
if (tpm.inited)
|
|
return 0;
|
|
|
|
if (tpm_decode_config(&tpm))
|
|
return -1;
|
|
|
|
if (tpm_select())
|
|
return -1;
|
|
|
|
/*
|
|
* Probe TPM twice; the first probing might fail because TPM is asleep,
|
|
* and the probing can wake up TPM.
|
|
*/
|
|
if (i2c_probe(tpm.slave_addr) && i2c_probe(tpm.slave_addr)) {
|
|
debug("%s: fail to probe i2c addr 0x%x\n", __func__,
|
|
tpm.slave_addr);
|
|
return -1;
|
|
}
|
|
|
|
tpm_deselect();
|
|
|
|
tpm.inited = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int tis_open(void)
|
|
{
|
|
int rc;
|
|
|
|
if (!tpm.inited)
|
|
return -1;
|
|
|
|
if (tpm_select())
|
|
return -1;
|
|
|
|
rc = tpm_open(tpm.slave_addr);
|
|
|
|
tpm_deselect();
|
|
|
|
return rc;
|
|
}
|
|
|
|
int tis_close(void)
|
|
{
|
|
if (!tpm.inited)
|
|
return -1;
|
|
|
|
if (tpm_select())
|
|
return -1;
|
|
|
|
tpm_close();
|
|
|
|
tpm_deselect();
|
|
|
|
return 0;
|
|
}
|
|
|
|
int tis_sendrecv(const uint8_t *sendbuf, size_t sbuf_size,
|
|
uint8_t *recvbuf, size_t *rbuf_len)
|
|
{
|
|
int len;
|
|
uint8_t buf[4096];
|
|
|
|
if (!tpm.inited)
|
|
return -1;
|
|
|
|
if (sizeof(buf) < sbuf_size)
|
|
return -1;
|
|
|
|
memcpy(buf, sendbuf, sbuf_size);
|
|
|
|
if (tpm_select())
|
|
return -1;
|
|
|
|
len = tpm_transmit(buf, sbuf_size);
|
|
|
|
tpm_deselect();
|
|
|
|
if (len < 10) {
|
|
*rbuf_len = 0;
|
|
return -1;
|
|
}
|
|
|
|
memcpy(recvbuf, buf, len);
|
|
*rbuf_len = len;
|
|
|
|
return 0;
|
|
}
|