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When writing to arbitrary locations in memory using a constructed
pointer, there is no guarantee that the compiler does not optimise away
the access, since it cannot detect any dependency.

One typical solution is to use the "volatile" keyword, but using MMIO
accessors in usually the better answer, to avoid torn writes.

Replace the usage of an array with such an MMIO accessor function in
rpi3_pwr_domain_on(), to make sure the write is really happening.

Change-Id: Ia18163c95e92f1557471089fd18abc6dc7fee0c7
Signed-off-by: Andre Przywara <andre.przywara@arm.com>

The hooks were populated but the power down left the CPU in limbo-land.
What we need to do - until there is a way to actually power off - is to
turn off the MMU and enter the spinning loop as if we were cold-booted.
This allows the on-call to pick up the CPU again.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Change-Id: Iefc7a58424e3578ad3dd355a7bd6eaba4b412699

As the PSCI "power" management functions for the Raspberry Pi 3 port
will be shared with the upcoming RPi4 support, we need to prepare them
for dealing with the GIC interrupt controller.
Splitting this code just for those simple calls to the generic GIC
routines does not seem worthwhile, so just use a #define the protect the
GIC code from being included by the existing RPi3 code.

Change-Id: Iaca6b0214563852b28ad4a088ec45348ae8be40d
Signed-off-by: Andre Przywara <andre.przywara@arm.com>

To be able to share code more easily between the existing Raspberry Pi 3
and the upcoming Raspberry Pi 4 platform, move some code which is not
board specific into a "common" directory.

Change-Id: I9211ab2d754b040128fac13c2f0a30a5cc8c7f2c
Signed-off-by: Andre Przywara <andre.przywara@arm.com>