> > > Am Donnerstag, 4. Dezember 2014, 06:55:18 schrieb Jarkko Sakkinen: > > > From: Will Arthur <[email protected]> > > > > > > Detect TPM 2.0 by using the extended STS (STS3) register. For TPM 2.0, > > > instead of calling tpm_get_timeouts(), assign duration and timeout > > > values defined in the TPM 2.0 PTP specification. > > > > > > Signed-off-by: Will Arthur <[email protected]> > > > Signed-off-by: Jarkko Sakkinen <[email protected]> > > > > > > > + sts3 = ioread8(chip->vendor.iobase + TPM_STS3(1)); > > > + if ((sts3 & TPM_STS3_TPM2_FAM) == TPM_STS3_TPM2_FAM) > > > + chip->flags = TPM_CHIP_FLAG_TPM2; > > > + > > > > > > > > When loading tpm_tis force=1 with my tpm1.2 chip on a machine without bios > > integration, it fets detected as a TPM2.0 chip :/ > > > > sudo rmmod tpm_tis > > # modprobe tpm_tis force=1 > > modprobe: ERROR: could not insert 'tpm_tis': No such device > > # dmesg > > [ 263.903828] tpm_tis tpm_tis: 2.0 TPM (device-id 0xB, rev-id 16) > > [ 263.948049] tpm_tis tpm_tis: A TPM error (10) occurred continue selftest > > [ 263.948120] tpm_tis tpm_tis: TPM self test failed > > > > > > sts3 is reported as 0xff from my TPM1.2 > > > > > Hmm, > my TPM2.0 chip also reports sts3 as 0xff (when loading with force=1 on a > machine without bios integration) > > [ 307.095344] sts3 ff > [ 307.095366] tpm_tis tpm_tis: 2.0 TPM (device-id 0x1A, rev-id 16) > [ 307.140047] tpm_tis tpm_tis: A TPM error (256) occurred continue selftest > [ 307.140056] tpm_tis tpm_tis: TPM self test failed
You are reading "sts3" - before requesting the locality and thus it returns 0xff for a TPM20 chip as well. --> You have to have an active locality first. For a TPM2.0 0xFF is not a valid value (if active locality is set), since reading commandCancel and resetEstablishment bit always return 0 on reads (according to spec). --> 0xFF should be treated as a TPM1.2 (older tpms with TIS 1.2) --> 0x04 should be treated as TPM 2.0 --> 0x08 should be treated as TPM1.2 (newer tpms with TIS1.3 enhanced) Thanks, Peter -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
