drivers/gfx: Add generic graphics with SSDT generator

Adds a generic graphics driver that can be added to a devicetree which
populates graphics-related ACPI table. It will write the _DOD method
(Enumerate All Devices Attached to the Display Adapter) and a device
object for each device defined. The device may optionally have a
connected privacy screen which can be controlled with a _DSM.

Example:
chip drivers/generic/gfx
  register "device_count" = "1"
  register "device[0].name" = ""LCD""
  register "device[0].addr" = "0x0400"
  register "device[0].privacy.enabled" = "1"
  register "device[0].privacy.detect_function" = ""\\_SB.PCI0.PVSC.GPVD""
  register "device[0].privacy.status_function" = ""\\_SB.PCI0.PVSC.GPVX""
  register "device[0].privacy.enable_function" = ""\\_SB.PCI0.PVSC.EPVX""
  register "device[0].privacy.disable_function" = ""\\_SB.PCI0.PVSC.DPVX""
  device generic 0 on end
end

ASL
Scope (\_SB.PCI0.GFX0)
{
    Method (_DOD, 0, NotSerialized)  // _DOD: Display Output Devices
    {
        Return (Package (0x01)
        {
            0x00000400
        })
    }

    Device (LCD)
    {
        Name (_ADR, 0x0400)  // _ADR: Address
        Name (_STA, 0x0F)  // _STA: Status
        Method (_DSM, 4, Serialized)  // _DSM: Device-Specific Method
        {
            ToBuffer (Arg0, Local0)
            If ((Local0 == ToUUID ("c7033113-8720-4ceb-9090-9d52b3e52d73")))
            {
                ToInteger (Arg2, Local1)
                If ((Local1 == Zero))
                {
                    Local2 = \_SB.PCI0.PVSC.GPVD ()
                    If ((Local2 == One))
                    {
                        Return (Buffer (One)
                        {
                                0x0F
                        })
                    }
                }

                If ((Local1 == One))
                {
                    ToBuffer (\_SB.PCI0.PVSC.GPVX (), Local2)
                    Return (Local2)
                }

                If ((Local1 == 0x02))
                {
                    \_SB.PCI0.PVSC.EPVX ()
                }

                If ((Local1 == 0x03))
                {
                    \_SB.PCI0.PVSC.DPVX ()
                }

                Return (Buffer (One)
                {
                        0x00
                })
            }

            Return (Buffer (One)
            {
                    0x00
            })
        }
    }
}

BUG=b:142237145
TEST=Added gfx to devicetree on sarien_cml and correct ASL in SSDT

Change-Id: Ida520dd7aad81ee7c1e5f2d0d3f5cc1a766d78a0
Signed-off-by: Mathew King <mathewk@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36041
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/drivers/generic/gfx/Kconfig b/src/drivers/generic/gfx/Kconfig
new file mode 100644
index 0000000000..1152f5bb7d
--- /dev/null
+++ b/src/drivers/generic/gfx/Kconfig
@@ -0,0 +1,6 @@
+config DRIVERS_GENERIC_GFX
+	bool
+	default n
+	depends on HAVE_ACPI_TABLES
+	help
+	  Include support for generic graphics device in devicetree