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drivers/spi/tpm: Add helper to get cr50 firmware version 

Introduce a helper to get the cached cr50 firmware version. This
information is in turn used to identify the strap configuration
supported by Cr50.

BUG=None
TEST=Ensure that Drawcia board boots to OS. Ensure that the version
cached cr50 firmware version is returned.

Change-Id: Id84b152993f253878a6c133cc433a0da2c990cf2
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44653
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-by: Sam McNally <sammc@google.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Karthikeyan Ramasubramanian 2020-08-20 22:53:00 -06:00 committed by Edward O'Callaghan
parent 4cc87d4e35
commit 7b58f9413d
2 changed files with 15 additions and 5 deletions
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10
src/drivers/spi/tpm/tpm.c
View File

@ -48,11 +48,6 @@ static struct spi_slave spi_slave;
/* Cached TPM device identification. */
static struct tpm2_info tpm_info;
struct cr50_firmware_version {
int epoch;
int major;
int minor;
};
static struct cr50_firmware_version cr50_firmware_version;
/*
@ -849,3 +844,8 @@ size_t tpm2_process_command(const void *tpm2_command, size_t command_size,
return payload_size;
}
void cr50_get_firmware_version(struct cr50_firmware_version *version)
{
memcpy(version, &cr50_firmware_version, sizeof(*version));
}

10
src/drivers/spi/tpm/tpm.h
View File

@ -16,6 +16,13 @@ struct tpm2_info {
uint16_t revision;
};
/* Structure describing the elements of Cr50 firmware version. */
struct cr50_firmware_version {
int epoch;
int major;
int minor;
};
/*
* Initialize a TPM2 device: read its id, claim locality of zero, verify that
* this indeed is a TPM2 device. Use the passed in handle to access the right
@ -44,4 +51,7 @@ void tpm2_get_info(struct tpm2_info *info);
/* Indicates whether Cr50 ready pulses are guaranteed to be at least 100us. */
bool cr50_is_long_interrupt_pulse_enabled(void);
/* Get the cr50 firmware version information. */
void cr50_get_firmware_version(struct cr50_firmware_version *version);
#endif /* ! __COREBOOT_SRC_DRIVERS_SPI_TPM_TPM_H */