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Some devices have GPIO pins that control USB port power connected to the EC, so they cannot be toggled by ACPI. This patch adds a memory map between the EC and ACPI that can be used on such devices. It can hold the power state of up to 8 USB ports. Currently, only dumb power ports are supported. BUG=chromium:833436 BRANCH=fizz TEST=On a fizz that runs BIOS with EC_ACPI_MEM_USB_PORT_POWER mapped, check that both reads and writes are propagated. Change-Id: I413defcb9e4d234fea7f54d46b6b8a1a10efa31e Signed-off-by: Emil Lundmark <lndmrk@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/1069273 Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com> Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly