When all cores in a cluster are powered down the parent cluster can
be also powered down. When the last core has requested powering down
follow by sending the cluster power down sequence to the system
power controller firmware.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Change-Id: I0ffeb339852c66ef62743aecd3e17ca20bad6216

The core number is called 'core_id' but the processor and device IDs are
called 'proc' and 'device'. Rename these to make them less confusing.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Change-Id: I3d7c6dddd7aa37b5dee1aa9689ce31730e9c3b59

We previously left our caches on during power-down to prevent any
non-caching accesses to memory that is cached by other cores. Now with
the last accessed areas all being marked as non-cached by
USE_COHERENT_MEM we can rely on that to workaround our interconnect
issues. Remove the old workaround.

Change-Id: Idadb7696d1449499d1edff4f6f62ab3b99d1efb7
Signed-off-by: Andrew F. Davis <afd@ti.com>

These sections of code are only needed for the coherency workaround
used for AM65x, if this workaround is not needed then this code
is not either. Mark it off to keep it separated from the rest of
the PSCI implementation.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Change-Id: I113ca6a2a1f7881814ab0a64e5bac57139bc03ef

This macro was used when many of these functions were stubbed out,
the macro is not used anymore, remove it.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Change-Id: Ida33f92fe3810a89e6e51faf6e93c1d2ada1a2ee

ATF should be the only host needing to control a processor that it has
started. ATF will need this control to stop the core later. Do not
relinquish control of a core after starting the core.

Signed-off-by: Andrew F. Davis <afd@ti.com>

Now that we have non-blocking TI-SCI functions we can initiate the shutdown
sequence from the PSCI handler without needing the ti_sci_proc_shutdown
helper function, which is removed. This gives us the greater control and
flexibility that will be needed when cluster power down sequences are added.

Signed-off-by: Andrew F. Davis <afd@ti.com>

To ensure WFI is reached before the PSC is trigger to power-down
a processor, the shutdonw API must be used.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Acked-by: Nishanth Menon <nm@ti.com>

Enforce full include path for includes. Deprecate old paths.

The following folders inside include/lib have been left unchanged:

- include/lib/cpus/${ARCH}
- include/lib/el3_runtime/${ARCH}

The reason for this change is that having a global namespace for
includes isn't a good idea. It defeats one of the advantages of having
folders and it introduces problems that are sometimes subtle (because
you may not know the header you are actually including if there are two
of them).

For example, this patch had to be created because two headers were
called the same way: e0ea0928d5b7 ("Fix gpio includes of mt8173 platform
to avoid collision."). More recently, this patch has had similar
problems: 46f9b2c3a282 ("drivers: add tzc380 support").

This problem was introduced in commit 4ecca33988b9 ("Move include and
source files to logical locations"). At that time, there weren't too
many headers so it wasn't a real issue. However, time has shown that
this creates problems.

Platforms that want to preserve the way they include headers may add the
removed paths to PLAT_INCLUDES, but this is discouraged.

Change-Id: I39dc53ed98f9e297a5966e723d1936d6ccf2fc8f
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

Leave the caches on and explicitly flush any data that
may be stale when the core is powered down. This prevents
non-coherent interconnect access which has negative side-
effects on AM65x.

Signed-off-by: Andrew F. Davis <afd@ti.com>

Use TI-SCI messages to request core power down from system controller
firmware.

Signed-off-by: Andrew F. Davis <afd@ti.com>

Use TI-SCI messages to request reset from system controller firmware.

Signed-off-by: Andrew F. Davis <afd@ti.com>

Use TI-SCI messages to request core start from system controller
firmware.

Signed-off-by: Andrew F. Davis <afd@ti.com>

To wake a core from wfi interrupts must be enabled, in some cases they
may not be and so we can lock up here. Unconditionally enable interrupts
before wfi and then restore interrupt state.

Signed-off-by: Andrew F. Davis <afd@ti.com>

These functions are used for the PSCI implementation and are needed to
build BL31, but we cannot implement them until we add several more drivers
related to ti-sci so these are only stubs for now.

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Benjamin Fair <b-fair@ti.com>
Signed-off-by: Andrew F. Davis <afd@ti.com>