src/security/tpm/tss/tss.c

   1 /* SPDX-License-Identifier: BSD-3-Clause */
   2
   3 #include <console/console.h>
   4 #include <drivers/crb/tpm.h>
   5 #include <drivers/i2c/tpm/tpm.h>
   6 #include <drivers/pc80/tpm/tpm.h>
   7 #include <drivers/spi/tpm/tpm.h>
   8 #include <security/tpm/tis.h>
   9 #include <security/tpm/tss.h>
  10
  11 /*
  12  * This unit is meant to dispatch to either TPM1.2 or TPM2.0 TSS implementation
  13  * based on TPM family determined on probing during initialization.
  14  */
  15
  16 enum tpm_family tlcl_tpm_family = TPM_UNKNOWN;
  17
  18 tis_sendrecv_fn tlcl_tis_sendrecv;
  19
  20 /* Probe for TPM device and choose implementation based on the returned TPM family. */
  21 tpm_result_t tlcl_lib_init(void)
  22 {
  23         /* Don't probe for TPM more than once per stage. */
  24         static bool init_done;
  25         if (init_done)
  26                 return tlcl_tpm_family == TPM_UNKNOWN ? TPM_CB_NO_DEVICE : TPM_SUCCESS;
  27
  28         /* Set right away to make recursion impossible. */
  29         init_done = true;
  30
  31         tlcl_tis_sendrecv = NULL;
  32         if (CONFIG(CRB_TPM))
  33                 tlcl_tis_sendrecv = crb_tis_probe(&tlcl_tpm_family);
  34         if (CONFIG(MEMORY_MAPPED_TPM) && tlcl_tis_sendrecv == NULL)
  35                 tlcl_tis_sendrecv = pc80_tis_probe(&tlcl_tpm_family);
  36         if (CONFIG(I2C_TPM) && tlcl_tis_sendrecv == NULL)
  37                 tlcl_tis_sendrecv = i2c_tis_probe(&tlcl_tpm_family);
  38         if (CONFIG(SPI_TPM) && tlcl_tis_sendrecv == NULL)
  39                 tlcl_tis_sendrecv = spi_tis_probe(&tlcl_tpm_family);
  40
  41         if (tlcl_tis_sendrecv == NULL) {
  42                 printk(BIOS_ERR, "%s: TIS probe failed\n", __func__);
  43                 tlcl_tpm_family = TPM_UNKNOWN;
  44         } else if (tlcl_tpm_family != TPM_1 && tlcl_tpm_family != TPM_2) {
  45                 printk(BIOS_ERR, "%s: TIS probe returned incorrect TPM family: %d\n", __func__,
  46                        tlcl_tpm_family);
  47                 tlcl_tpm_family = TPM_UNKNOWN;
  48         }
  49
  50         return tlcl_tpm_family == TPM_UNKNOWN ? TPM_CB_NO_DEVICE : TPM_SUCCESS;
  51 }