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// SPDX-License-Identifier: Apache-2.0
/* Copyright 2013-2018 IBM Corp. */
#ifndef __TPM_H
#define __TPM_H
#include <device.h>
#include "tss/tpmLogMgr.H"
#include "tss/trustedTypes.H"
struct tpm_dev {
/* TPM bus id */
int bus_id;
/* TPM address in the bus */
int i2c_addr;
};
struct tpm_driver {
/* Driver name */
const char* name;
/* Transmit the TPM command stored in buf to the tpm device */
int (*transmit)(struct tpm_dev *dev, uint8_t* buf, size_t cmdlen,
size_t *buflen);
};
struct tpm_chip {
/* TPM chip id */
int id;
/* Indicates whether or not the device and log are functional */
bool enabled;
/* TPM device tree node */
struct dt_node *node;
/* Event log handler */
struct _TpmLogMgr logmgr;
/* TPM device handler */
struct tpm_dev *dev;
/* TPM driver handler */
struct tpm_driver *driver;
struct list_node link;
};
/* TSS tweak */
typedef struct tpm_chip TpmTarget;
/*
* Register a tpm chip by binding the driver to dev.
* Event log is also registered by this function.
*/
extern int tpm_register_chip(struct dt_node *node, struct tpm_dev *dev,
struct tpm_driver *driver);
/*
* tpm_extendl - For each TPM device, this extends the sha1 and sha 256 digests
* to the indicated PCR and also records an event for the same PCR
* in the event log
* This calls a TSS extend function that supports multibank. Both sha1 and
* sha256 digests are extended in a single operation sent to the TPM device.
*
* @pcr: PCR number to be extended and recorded in the event log. The same PCR
* number is extende for both sha1 and sha256 banks.
* @alg1: SHA algorithm of digest1. Either TPM_ALG_SHA1 or TPM_ALG_SHA256
* @digest1: digest1 buffer
* @size1: size of digest1. Either TPM_ALG_SHA1_SIZE or TPM_ALG_SHA256_SIZE
* @alg2: SHA algorithm of digest2. Either TPM_ALG_SHA1 or TPM_ALG_SHA256
* @digest2: digest2 buffer
* @size2: size of digest2. Either TPM_ALG_SHA1_SIZE or TPM_ALG_SHA256_SIZE
* @event_type: event type log. In skiboot, either EV_ACTION or EV_SEPARATOR.
* @event_msg: event log message that describes the event
*
* Returns O for success or a negative number if it fails.
*/
extern int tpm_extendl(TPM_Pcr pcr,
TPM_Alg_Id alg1, uint8_t* digest1, size_t size1,
TPM_Alg_Id alg2, uint8_t* digest2, size_t size2,
uint32_t event_type, const char* event_msg);
/* Add status property to the TPM devices */
extern void tpm_add_status_property(void);
extern int tpm_init(void);
extern void tpm_cleanup(void);
#endif /* __TPM_H */
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