drivers/intel/ish: Allow adding DmaProperty to _DSD

On nissa, the ISH is running closed source firmware, so the ChromeOS
security requirements specify it must be behind an IOMMU. Allow adding
DmaProperty to the _DSD of the ISH device. This will result in the
kernel marking the device as untrusted.

BUG=b:249846505
TEST=Check SSDT is correct, and kernel detects the DmaProperty and
firmware-name properties.

SSDT entry on yaviks with both add_acpi_dma_property and firmware_name
set in devictree:
    Scope (\_SB.PCI0.ISHB)
    {
        Name (_DSD, Package (0x04)  // _DSD: Device-Specific Data
        {
            ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301") /* Device Properties for _DSD */,
            Package (0x01)
            {
                Package (0x02)
                {
                    "firmware-name",
                    "adl_ish_lite.bin"
                }
            },

            ToUUID ("70d24161-6dd5-4c9e-8070-705531292865"),
            Package (0x01)
            {
                Package (0x02)
                {
                    "DmaProperty",
                    One
                }
            }
        })
    }

Change-Id: Ie1539fc757e72e995e98c3ecf83e705e3bede8c0
Signed-off-by: Reka Norman <rekanorman@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70632
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Kangheui Won <khwon@chromium.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/drivers/intel/ish/chip.h b/src/drivers/intel/ish/chip.h
index 6f8c0c6df5..e7bb8f87e5 100644
--- a/src/drivers/intel/ish/chip.h
+++ b/src/drivers/intel/ish/chip.h
@@ -6,4 +6,7 @@
 struct drivers_intel_ish_config {
 	/* Firmware name used by kernel for loading ISH firmware */
 	const char *firmware_name;
+
+	/* Add `DmaProperty` in _DSD */
+	bool add_acpi_dma_property;
 };