intel/wifi: Add WRDD ACPI method

Hardware / Coreboot - Duncan Laurie [chromium.org] - 8 March 2016 11:42 UTC

Add an ACPI file containing a generic WRDD method that is used by Intel wireless kernel drivers to determine the country code to be used for regulatory domain configuration of the wireless radios.

This requires an NVS variable called 'CID1' to provide an ISO-3166-2 alpha-2 country code or it will just return 0 instead.

This is implemented as a bare method because this needs to be included directly into the wifi device that is defined by the mainboard as it may have board-specific settings like _PRW that need to be provided as well.

BUG=chrome-os-partner:50516 BRANCH=glados TEST=boot on chell with 'region'='us' in VPD and see that it is properly read out by calling WRDD method on the WiFi device.

Change-Id: I27a5e27f65d05ff62a0e79a87a32c1ef0c5d0ef3

8951ed8 intel/wifi: Add WRDD ACPI method
src/drivers/intel/wifi/acpi/wrdd.asl | 37 ++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)

Upstream: review.coreboot.org

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