diff options
Diffstat (limited to 'src/soc/amd/stoneyridge/southbridge.c')
| -rw-r--r-- | src/soc/amd/stoneyridge/southbridge.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/soc/amd/stoneyridge/southbridge.c b/src/soc/amd/stoneyridge/southbridge.c index 367c565486..bb3157d395 100644 --- a/src/soc/amd/stoneyridge/southbridge.c +++ b/src/soc/amd/stoneyridge/southbridge.c @@ -470,8 +470,38 @@ void sb_read_mode(u32 mode) & ~SPI_READ_MODE_MASK) | mode); } +/* + * Enable FCH to decode TPM associated Memory and IO regions + * + * Enable decoding of TPM cycles defined in TPM 1.2 spec + * Enable decoding of legacy TPM addresses: IO addresses 0x7f- + * 0x7e and 0xef-0xee. + * This function should be called if TPM is connected in any way to the FCH and + * conforms to the regions decoded. + * Absent any other routing configuration the TPM cycles will be claimed by the + * LPC bus + */ +void sb_tpm_decode(void) +{ + u32 value; + + value = pci_read_config32(SOC_LPC_DEV, LPC_TRUSTED_PLATFORM_MODULE); + value |= TPM_12_EN | TPM_LEGACY_EN; + pci_write_config32(SOC_LPC_DEV, LPC_TRUSTED_PLATFORM_MODULE, value); +} + +/* + * Enable FCH to decode TPM associated Memory and IO regions to SPI + * + * This should be used if TPM is connected to SPI bus. + * Assumes SPI address space is already configured via a call to sb_spibase(). + */ void sb_tpm_decode_spi(void) { + /* Enable TPM decoding to FCH */ + sb_tpm_decode(); + + /* Route TPM accesses to SPI */ u32 spibase = pci_read_config32(SOC_LPC_DEV, SPIROM_BASE_ADDRESS_REGISTER); pci_write_config32(SOC_LPC_DEV, SPIROM_BASE_ADDRESS_REGISTER, spibase |