1 /* SPDX-License-Identifier: BSD-3-Clause */ 2 3 #ifndef __COREBOOT_SRC_DRIVERS_SPI_TPM_TPM_H 4 #define __COREBOOT_SRC_DRIVERS_SPI_TPM_TPM_H 5 6 #include <drivers/tpm/cr50.h> 7 #include <security/tpm/tis.h> 8 #include <security/tpm/tss_errors.h> 9 #include <stddef.h> 10 #include <spi-generic.h> 11 12 #define TPM_LOCALITY_0_SPI_BASE 0x00d40000 13 14 /* 15 * A TPM device descriptor, values read from the appropriate device registers 16 * are cached here. 17 */ 18 struct tpm2_info { 19 uint16_t vendor_id; 20 uint16_t device_id; 21 uint16_t revision; 22 }; 23 24 /* 25 * Initialize a TPM2 device: read its id, claim locality of zero, verify that 26 * this indeed is a TPM2 device. Use the passed in handle to access the right 27 * SPI port. 28 * 29 * Return 0 on success, non-zero on failure. 30 */ 31 tpm_result_t tpm2_init(struct spi_slave *spi_if); 32 33 /* 34 * Each command processing consists of sending the command to the TPM, by 35 * writing it into the FIFO register, then polling the status register until 36 * the TPM is ready to respond, then reading the response from the FIFO 37 * register. The size of the response can be gleaned from the 6 byte header. 38 * 39 * This function places the response into the tpm2_response buffer and returns 40 * the size of the response. 41 */ 42 size_t tpm2_process_command(const void *tpm2_command, size_t command_size, 43 void *tpm2_response, size_t max_response); 44 45 /* Get information about previously initialized TPM device. */ 46 void tpm2_get_info(struct tpm2_info *info); 47 48 tis_sendrecv_fn spi_tis_probe(enum tpm_family *family); 49 50 #endif /* ! __COREBOOT_SRC_DRIVERS_SPI_TPM_TPM_H */ 51