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-The U-Boot Driver Model Project
-===============================
-TPM system analysis
-===================
-Marek Vasut <marek.vasut@gmail.com>
-2012-02-23
-
-I) Overview
------------
-
-There is currently only one TPM chip driver available and therefore the API
-controlling it is very much based on this. The API is very simple:
-
- int tis_open(void);
- int tis_close(void);
- int tis_sendrecv(const u8 *sendbuf, size_t send_size,
- u8 *recvbuf, size_t *recv_len);
-
-The command operating the TPM chip only provides operations to send and receive
-bytes from the chip.
-
-II) Approach
-------------
-
-The API can't be generalised too much considering there's only one TPM chip
-supported. But it's a good idea to split the tis_sendrecv() function in two
-functions. Therefore the new API will use register the TPM chip by calling:
-
- tpm_device_register(struct instance *i, const struct tpm_ops *ops);
-
-And the struct tpm_ops will contain the following members:
-
- struct tpm_ops {
- int (*tpm_open)(struct instance *i);
- int (*tpm_close)(struct instance *i);
- int (*tpm_send)(const uint8_t *buf, const size_t size);
- int (*tpm_recv)(uint8_t *buf, size_t *size);
- };
-
-The behaviour of "tpm_open()" and "tpm_close()" will basically copy the
-behaviour of "tis_open()" and "tis_close()". The "tpm_send()" will be based on
-the "tis_senddata()" and "tis_recv()" will be based on "tis_readresponse()".
-
-III) Analysis of in-tree drivers
---------------------------------
-
-There is only one in-tree driver present, the "drivers/tpm/generic_lpc_tpm.c",
-which will be simply converted as outlined in previous chapter.