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This code is used on x86 platforms to control a standard LPC
based TPM device. The actual driver implementation is based on
the article "Writing a TPM Device Driver" published on
http://ptgmedia.pearsoncmg.com and the submission by Stefan
Berger on Qemu-devel mailing list.
One substantial difference is that in the simplest configuration
(the case of the Alex device under coreboot/u-boot control) the
other than 0 TPM localities do not get mapped by some devices
(for instance, by Infineon slb9635), so this driver provides
access to locality 0 only.
BUG=chrome-os-partner:4547
TEST=manual
Booted an Alex with this code, tried accessing TPM. Access
routines do not fail, even though it is not yet possible to write
data into a TPM location and read it back. This could be related
to the fact that the CLI command does not intialize the TPM
properly.
boot > tpm
generic_lpc_tpm.c:155 found TPM SLB9635 TT 1.2 by Infineon
boot > tpm r 0x1008 10
boot > tpm w 0x1008 1 2 3 4
boot > tpm r 0x1008 4
Change-Id: Id8d23e9bb24ba2bcd999135c99e7612f9010f384
Reviewed-on: http://gerrit.chromium.org/gerrit/5492
Reviewed-by: Stefan Reinauer <reinauer@google.com>
Tested-by: Vadim Bendebury <vbendeb@chromium.org>
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