drivers/pcie/generic: Add new pcie generic chip driver

This new chip driver will be used for attaching ACPI properties to PCIe
endpoints. The first property it supports is "UntrustedDevice." This
property can be used by a payload to, e.g., restrict the device to its
own IOMMU domain for security purposes. The new property is added by
adding a _DSD and an integer property set to 1.

Example of the property from google/brya0:

Scope (\_SB.PCI0.RP01)
{
    Device (DEV0)
    {
        Name (_ADR, 0x0000000000000000)  // _ADR: Address
        Name (_DSD, Package (0x02)  // _DSD: Device-Specific Data
        {
            ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301") /* Device Properties for _DSD */,
            Package (0x01)
            {
                Package (0x02)
                {
                    "UntrustedDevice",
                    One
                }
            }
        })
    }
}

BUG=b:215424986
TEST=boot patch train on google/brya0, dump SSDT, see above for snippet

Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Change-Id: I53986614dcbf4d10a6bb4010e131f5ff5a9d25cf
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61627
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>

0 files changed, 0 insertions, 0 deletions