src/drivers/i2c/tpm/tpm.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 /*
   4  * Description:
   5  * Device driver for TCG/TCPA TPM (trusted platform module).
   6  * Specifications at www.trustedcomputinggroup.org
   7  *
   8  * It is based on the Linux kernel driver tpm.c from Leendert van
   9  * Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall.
  10  */
  11
  12 #ifndef __DRIVERS_TPM_SLB9635_I2C_TPM_H__
  13 #define __DRIVERS_TPM_SLB9635_I2C_TPM_H__
  14
  15 #include <security/tpm/tis.h>
  16 #include <security/tpm/tss_errors.h>
  17 #include <stdint.h>
  18
  19 enum tpm_timeout {
  20         TPM_TIMEOUT = 1,        /* msecs */
  21 };
  22
  23 /* Size of external transmit buffer (used for stack buffer in tpm_sendrecv) */
  24 #define TPM_BUFSIZE 1260
  25
  26 /* Number of bytes in the TPM header */
  27 #define TPM_HEADER_SIZE 10
  28
  29 /* Index of fields in TPM command buffer */
  30 #define TPM_CMD_SIZE_BYTE 2
  31 #define TPM_CMD_ORDINAL_BYTE 6
  32
  33 /* Index of Count field in TPM response buffer */
  34 #define TPM_RSP_SIZE_BYTE 2
  35 #define TPM_RSP_RC_BYTE 6
  36
  37 #define TPM_ACCESS(l)                   (0x0000 | ((l) << 4))
  38 #define TPM_STS(l)                      (0x0001 | ((l) << 4))
  39 #define TPM_DATA_FIFO(l)                (0x0005 | ((l) << 4))
  40 #define TPM_DID_VID(l)                  (0x0006 | ((l) << 4))
  41
  42 struct tpm_chip {
  43         uint8_t req_complete_mask;
  44         uint8_t req_complete_val;
  45         uint8_t req_canceled;
  46
  47         int (*recv)(uint8_t *buf, size_t len);
  48         int (*send)(uint8_t *buf, size_t len);
  49         void (*cancel)(void);
  50         uint8_t (*status)(void);
  51 };
  52
  53 /* ---------- Interface for TPM vendor ------------ */
  54
  55 tpm_result_t tpm_vendor_probe(unsigned int bus, uint32_t addr, enum tpm_family *family);
  56
  57 tpm_result_t tpm_vendor_init(struct tpm_chip *chip, unsigned int bus, uint32_t dev_addr);
  58
  59 tis_sendrecv_fn i2c_tis_probe(enum tpm_family *family);
  60
  61 #endif /* __DRIVERS_TPM_SLB9635_I2C_TPM_H__ */