mt_scp: Enable I/D-cache on boot

Enable cache mapping on boot, add functions for cache support.

Invalidate the cache on boot, and add benchmarching function.

BRANCH=none
BUG=b:117804463
TEST=Boot kukui_scp with TEST-ONLY CL.
TEST=Run dcachetest command, see performance difference,
     and lack of coherency if the data is updated from AP side.
     > dcachetest
  cached: 19745 us (val: ef915230)
  cached+inval: 39402 us (val: ef915230)
  direct: 94096 us (val: ef915230)
TEST=See that icachetest (cached) and perftest have similar performance:
> icachetest
run from DRAM (cached): 102779 us (total: 12a052eb9)
run from DRAM (direct): 1867168 us (total: 12a052eb9)
> perftest
run from SRAM: 102566 us (total: 12a052eb9)
TEST=cacheinfo reports sensible data:
> cacheinfo
Icache hit count:    12000127
Icache access count: 12000131
Dcache hit count:    960034
Dcache access count: 1024034

Change-Id: I3272f4ff9edc0059c4937908b1235346c582c680
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1391529
Reviewed-by: Rong Chang <rongchang@chromium.org>

0 files changed, 0 insertions, 0 deletions