Attention is currently required from: Arthur Heymans, Cliff Huang, David Ruth, Lance Zhao, Nico Huber, Paul Menzel, Subrata Banik, Subrata Banik, Tim Wawrzynczak.

David Ruth uploaded patch set #9 to this change.

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The following approvals got outdated and were removed: Code-Review+1 by Arthur Heymans, Code-Review+1 by Nico Huber, Verified+1 by build bot (Jenkins)

Add MTCL function to ACPI SSDT tables

The MTCL function provides a country list to the Linux kernel via an
ACPI function in SSDT for MediaTek WiFi chipsets that are capable of
operating on the 6GHz band. The country list is used to selectively
disable 6GHz and 5.9GHz operation based on the country the device is
operating in.

The function needs to read a binary file and send it as a package via
the MTCL method in SSDT for PCIe WiFi with MediaTek chipsets.

Change Summary:
* Adds the mtcl.c file to abstract functionality related to reading the
  binary file that defines the MTCL, and verifying that the format is
  one intended to be handled by this implementation.
  * Reads a binary file called "wifi_mtcl.hex" in cbfs
  * Verifies that the format matches a supported value
  * Writes the verified content as appropriate AML.
* Adds config flag DRIVERS_MTK_WIFI to src/drivers/wifi/generic in order
  to include MediaTek WiFi specific functionality
  * Adds config flag USE_MTCL which depends on DRIVERS_MTK_WIFI and
    enables including the specific ACPI function defined in SSDT
  * Adds config flag CONFIG_WIFI_MTCL_CBFS_FILEPATH which depends on
    DRIVERS_MTK_WIFI which enables configuring the file to add as
    "wifi_mtcl.hex"
* Adds functionality to src/drivers/wifi/generic/acpi.c to include the
  MTCL function in SSDT for WiFi devices when the above flags are
  enabled

BUG=b:295544553
TEST=Add Kconfig entry USE_MTCL for pujjo
TEST=Add wifi_mtcl_defaults.hex blob to cbfs
TEST=Build coreboot for pujjo `emerge-nissa coreboot chromeos-bootimage`
TEST=Verify that MTCL defined in the file is present:
TEST=`acpidump -b`
TEST=`iasl ssdt.dat`
TEST=`less ssdt.dsl`
TEST=Search for MTCL

Signed-off-by: David Ruth <druth@chromium.org>
Change-Id: I9b5e7312a44e114270e664b983626faa6cfee350
---
M src/drivers/wifi/generic/Kconfig
M src/drivers/wifi/generic/Makefile.inc
M src/drivers/wifi/generic/acpi.c
A src/drivers/wifi/generic/mtcl.c
M src/include/device/pci_ids.h
A src/include/mtcl.h
6 files changed, 217 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/70/80170/9

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