diff options
Diffstat (limited to 'src/drivers/spi/tpm')
| -rw-r--r-- | src/drivers/spi/tpm/tpm.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/drivers/spi/tpm/tpm.c b/src/drivers/spi/tpm/tpm.c index b02fc5fbea..4de62d95c4 100644 --- a/src/drivers/spi/tpm/tpm.c +++ b/src/drivers/spi/tpm/tpm.c @@ -32,6 +32,7 @@ #define TPM_DATA_FIFO_REG (TPM_LOCALITY_0_SPI_BASE + 0x24) #define TPM_DID_VID_REG (TPM_LOCALITY_0_SPI_BASE + 0xf00) #define TPM_RID_REG (TPM_LOCALITY_0_SPI_BASE + 0xf04) +#define TPM_FW_VER (TPM_LOCALITY_0_SPI_BASE + 0xf90) /* SPI Interface descriptor used by the driver. */ struct tpm_spi_if { @@ -355,6 +356,36 @@ int tpm2_init(struct spi_slave *spi_if) printk(BIOS_INFO, "Connected to device vid:did:rid of %4.4x:%4.4x:%2.2x\n", tpm_info.vendor_id, tpm_info.device_id, tpm_info.revision); + /* Let's report device FW version if available. */ + if (tpm_info.vendor_id == 0x1ae0) { + int chunk_count = 0; + uint32_t chunk = 0; + char vstr[sizeof(chunk) + 1]; /* room for 4 chars + zero */ + + printk(BIOS_INFO, "Firmware version: "); + + /* + * Does not really matter what's written, this just makes sure + * the version is reported from the beginning. + */ + tpm2_write_reg(TPM_FW_VER, &chunk, sizeof(chunk)); + + /* Print it out in 4 byte chunks. */ + vstr[sizeof(vstr) - 1] = 0; + do { + tpm2_read_reg(TPM_FW_VER, vstr, sizeof(chunk)); + printk(BIOS_INFO, "%s", vstr); + + /* + * While string is not over, and no more than 200 + * characters. + * This is likely result in one extra printk() + * invocation with an empty string, not a big deal. + */ + } while (vstr[0] && (chunk_count++ < (200 / sizeof(chunk)))); + + printk(BIOS_INFO, "\n"); + } return 0; } |