tree df1d30547daf8dec1c85dc0ef57dce81f48a2b59
parent 8d6b18a2a2ccbbb3dd53122dae1437fbe588a114
author Chen-Yu Tsai <wens@csie.org> 1516178813 +0800
committer Chen-Yu Tsai <wens@csie.org> 1519096360 +0800

ARM: sun9i: smp: Support cpu0 hotplug

The BROM has a branch that checks if the primary core is hotplugging.
If the magic flag is set, execution jumps to the address set in the
software entry register. (Secondary cores always branch to the that
address.)

This patch sets the flags that makes BROM jump execution on the
primary core (cpu0) to the SMP software entry code when the core is
powered back up. After it is re-integrated into the system, the flag
is cleared.

A custom .cpu_can_disable callback that returns true for all cpus,
so that cpu0 can really be brought down.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>