tpm.h

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/* SPDX-License-Identifier: BSD-3-Clause */
/* This is a driver for a Command Response Buffer Interface */
 
/* CRB driver */
/* address of locality 0 (CRB) */
#define TPM_CRB_BASE_ADDRESS        CONFIG_CRB_TPM_BASE_ADDRESS
 
#define CRB_REG(LOCTY, REG)                                 \
        (void *)(uintptr_t)(CONFIG_CRB_TPM_BASE_ADDRESS + (LOCTY << 12) + REG)
 
/* hardware registers */
#define CRB_REG_LOC_STATE               0x00
#define CRB_REG_LOC_CTRL                0x08
#define CRB_REG_LOC_STS                 0x0C
 
/* LOC_CTRL BIT MASKS */
#define LOC_CTRL_REQ_ACCESS             0x01
 
/* LOC STATE BIT MASKS */
#define LOC_STATE_LOC_ASSIGN    0x02
#define LOC_STATE_REG_VALID_STS 0x80
 
/* LOC STS BIT MASKS */
#define LOC_STS_GRANTED                 0x01
 
#define CRB_REG_INTF_ID                 0x30
#define CRB_REG_REQUEST                 0x40
#define CRB_REG_STATUS                  0x44
#define CRB_REG_CANCEL                  0x48
#define CRB_REG_START                   0x4C
#define CRB_REG_INT_CTRL                0x50
#define CRB_REG_CMD_SIZE                0x58
#define CRB_REG_CMD_ADDR                0x5C
#define CRB_REG_RESP_SIZE               0x64
#define CRB_REG_RESP_ADDR               0x68
 
/* CRB INTF BIT MASK */
#define CRB_INTF_REG_CAP_CRB    (1<<14)
#define CRB_INTF_REG_INTF_SEL   (1<<17)
#define CRB_INTF_REG_INTF_LOCK  (1<<19)
 
/*REQUEST Register related */
#define CRB_REG_REQUEST_CMD_RDY         0x01
#define CRB_REG_REQUEST_GO_IDLE         0x02
 
/* STATUS Register related */
#define CRB_REG_STATUS_ERROR            0x01
#define CRB_REG_STATUS_IDLE                     0x02
 
/* START Register related */
#define CRB_REG_START_START                     0x01
 
/* TPM Info Struct */
struct tpm2_info {
        uint16_t vendor_id;
        uint16_t device_id;
        uint16_t revision;
};
 
int tpm2_init(void);
void tpm2_get_info(struct tpm2_info *tpm2_info);
size_t tpm2_process_command(const void *tpm2_command, size_t command_size,
                            void *tpm2_response, size_t max_response);