soc/intel/common: Add option to disable eSPI SMI at runtime

Add an option that will disable eSPI SMI when ACPI mode is enabled,
and re-enable eSPI SMI when ACPI mode is disabled.  Additionally it
ensures eSPI SMI is disabled on the ACPI OS resume path.

This allows a mainboard to ensure that the Embedded Controller will
not be able to assert SMI at runtime when booted into an ACPI aware
operating system.

This was tested on a Sarien board with the Wilco EC to ensure that
the eSPI SMI enable bit is clear when booted into the OS, and remains
clear after resume.

Change-Id: Ic305c3498dfa4b8166cfdb070fc404dd4618ba3c
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/29535
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

0 files changed, 0 insertions, 0 deletions