Add workaround for a Juno platform errata ...

This patch adds the recommended workaround for defect id 831273 by triggering
the event stream every 65536 cycles.

Change-Id: I62c947e64396f10af62af495e413d0af846d6628

Revert Cortex-A57 r0p0 errata #814670 ...

This patch reverts the workaround for errata #814670: "A57 DMB barrier does not
guarantee observation of the effects of a cache maintenance operation". Cache
maintenance by set/way operations is performed only for processor power
down. BROADCASTCACHEMAINT = 1'b1 on the Cortex-A57 macro on Juno. Hence this
erratum will have no impact.

Change-Id: I6824044c963b28d59aed39712a6da376dc053b82

Add support for selected Cortex-A57 r0p0 errata ...

This patch ensures that workarounds for erratas #806969, #813420 & #814670 that
affect Cortex-A57 r0p0 as described in the errata notice document are
implemented after every reset on each cpu.

Change-Id: I37ee16bafa623c405197925c5a0e66811d4c50ae

juno: Increase L2RAM wait state to support higher cluster frequencies ...

Change-Id: I7f1fb4ed01ed73de1196ca17ed6fc1524478ec75

Access system registers directly in assembler ...

Instead of using the system register helper functions to read
or write system registers, assembler coded functions should
use MRS/MSR instructions. This results in faster and more
compact code.

This change replaces all usage of the helper functions with
direct register accesses.

Change-Id: I791d5f11f257010bb3e6a72c6c5ab8779f1982b3

Correct usage of data and instruction barriers ...

The current code does not always use data and instruction
barriers as required by the architecture and frequently uses
barriers excessively due to their inclusion in all of the
write_*() helper functions.

Barriers should be used explicitly in assembler or C code
when modifying processor state that requires the barriers in
order to enable review of correctness of the code.

This patch removes the barriers from the helper functions and
introduces them as necessary elsewhere in the code.

PORTING NOTE: check any port of Trusted Firmware for use of
system register helper functions for reliance on the previous
barrier behaviour and add explicit barriers as necessary.

Fixes ARM-software/tf-issues#92

Change-Id: Ie63e187404ff10e0bdcb39292dd9066cb84c53bf

Move include and source files to logical locations ...

Move almost all system include files to a logical sub-directory
under ./include. The only remaining system include directories
not under ./include are specific to the platform. Move the
corresponding source files to match the include directory
structure.

Also remove pm.h as it is no longer used.

Change-Id: Ie5ea6368ec5fad459f3e8a802ad129135527f0b3