drivers/intel/gma: Hook up libgfxinit

Add `libgfxinit` as another option for native graphics initialization.
For that, the function gma_gfxinit() (see drivers/intel/gma/i915.h) has
to be called by the respective northbridge/soc code.

A mainboard port needs to select `CONFIG_MAINBOARD_HAS_LIBGFXINIT` and
implement the Ada package `GMA.Mainboard` with a single function `ports`
that returns a list of ports to be probed for displays.

v2: Update 3rdparty/libgfxinit to its latest master commit to make
    things buildable within coreboot.

v3: Another update to 3rdparty/libgfxinit. Including support to select
    the I2C port for VGA.

Change-Id: I4c7be3745f32853797d3f3689396dde07d4ca950
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/16952
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/src/drivers/intel/gma/Makefile.inc b/src/drivers/intel/gma/Makefile.inc
index 88b91f6a20..a4e007c373 100644
--- a/src/drivers/intel/gma/Makefile.inc
+++ b/src/drivers/intel/gma/Makefile.inc
@@ -20,3 +20,26 @@ ifeq ($(CONFIG_VGA_ROM_RUN),y)
 ramstage-$(CONFIG_INTEL_INT15) += int15.c
 endif
 ramstage-$(CONFIG_INTEL_GMA_ACPI) += acpi.c
+
+
+ifeq ($(CONFIG_MAINBOARD_USE_LIBGFXINIT),y)
+
+$(call add-special-class,gfxinit)
+gfxinit-handler = $(eval ramstage-srcs += $(1)$(2))
+
+$(call add-special-class,gfxinit-gen)
+gfxinit-gen-handler = \
+	$(eval additional-dirs += $(dir $(2))) \
+	$(eval ramstage-srcs += $(2)) \
+	$(eval ramstage-ads-deps += $(2)) \
+	$(eval ramstage-adb-deps += $(2)) \
+	$(eval $(2): $(obj)/config.h)
+
+CONFIG_GFX_GMA_DEFAULT_MMIO := 0 # dummy, will be overwritten at runtime
+
+subdirs-y += ../../../../3rdparty/libgfxinit
+
+ramstage-y += gma.ads
+ramstage-y += gma.adb
+
+endif # CONFIG_MAINBOARD_USE_LIBGFXINIT