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/* SPDX-License-Identifier: BSD-3-Clause */
#include <console/console.h>
#include <security/tpm/tis.h>
#include <security/tpm/tss.h>
/*
* This unit is meant to dispatch to either TPM1.2 or TPM2.0 TSS implementation
* based on TPM family determined on probing during initialization.
*/
enum tpm_family tlcl_tpm_family = TPM_UNKNOWN;
tis_sendrecv_fn tlcl_tis_sendrecv;
/* Probe for TPM device and choose implementation based on the returned TPM family. */
tpm_result_t tlcl_lib_init(void)
{
/* Don't probe for TPM more than once per stage. */
static bool init_done;
if (init_done)
return tlcl_tpm_family == TPM_UNKNOWN ? TPM_CB_NO_DEVICE : TPM_SUCCESS;
/* Set right away to make recursion impossible. */
init_done = true;
tlcl_tis_sendrecv = tis_probe(&tlcl_tpm_family);
if (tlcl_tis_sendrecv == NULL) {
printk(BIOS_ERR, "%s: tis_probe failed\n", __func__);
tlcl_tpm_family = TPM_UNKNOWN;
} else if (tlcl_tpm_family != TPM_1 && tlcl_tpm_family != TPM_2) {
printk(BIOS_ERR, "%s: tis_probe returned incorrect TPM family: %d\n", __func__,
tlcl_tpm_family);
tlcl_tpm_family = TPM_UNKNOWN;
}
return tlcl_tpm_family == TPM_UNKNOWN ? TPM_CB_NO_DEVICE : TPM_SUCCESS;
}
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