tree d420e2a7cbda72359ce3f89641d7f38f1fe2a1cc
parent 2ac7b223878502d5e05fa53f1846d7c4564ea526
author Jeetesh Burman <jburman@nvidia.com> 1530887618 +0530
committer Varun Wadekar <vwadekar@nvidia.com> 1583959045 -0700

Tegra194: add SE support to generate SHA256 of TZRAM

The BL3-1 firmware code is stored in TZSRAM on Tegra194 platforms. This
memory loses power when we enter System Suspend and so its contents are
stored to TZDRAM, before entry. This opens up an attack vector where the
TZDRAM contents might be tampered with when we are in the System Suspend
mode. To mitigate this attack the SE engine calculates the hash of entire
TZSRAM and stores it in PMC scratch, before we copy data to TZDRAM. The
WB0 code will validate the TZDRAM and match the hash with the one in PMC
scratch.

This patch adds driver for the SE engine, with APIs to calculate the hash
and store to PMC scratch registers.

Change-Id: I04cc0eb7f54c69d64b6c34fc2ff62e4cfbdd43b2
Signed-off-by: Jeetesh Burman <jburman@nvidia.com>