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, 43 insertions, 0 deletions

diff --git a/src/drivers/intel/gma/gma.ads b/src/drivers/intel/gma/gma.ads
new file mode 100644
index 0000000000..d912df1635
--- /dev/null
+++ b/src/drivers/intel/gma/gma.ads
@@ -0,0 +1,43 @@
+with Interfaces.C;
+
+with HW;
+use HW;
+
+package GMA
+is
+
+   procedure gfxinit
+     (mmio_base   : in     word64;
+      linear_fb   : in     word64;
+      phys_fb     : in     word32;
+      lightup_ok  :    out Interfaces.C.int);
+   pragma Export (C, gfxinit, "gma_gfxinit");
+
+   ----------------------------------------------------------------------------
+
+   function vbe_mode_info_valid return Interfaces.C.int;
+   pragma Export (C, vbe_mode_info_valid, "vbe_mode_info_valid");
+
+   type lb_framebuffer is record
+      tag                  : word32;
+      size                 : word32;
+
+      physical_address     : word64;
+      x_resolution         : word32;
+      y_resolution         : word32;
+      bytes_per_line       : word32;
+      bits_per_pixel       : word8;
+      red_mask_pos         : word8;
+      red_mask_size        : word8;
+      green_mask_pos       : word8;
+      green_mask_size      : word8;
+      blue_mask_pos        : word8;
+      blue_mask_size       : word8;
+      reserved_mask_pos    : word8;
+      reserved_mask_size   : word8;
+   end record;
+
+   procedure fill_lb_framebuffer (framebuffer : out lb_framebuffer);
+   pragma Export (C, fill_lb_framebuffer, "fill_lb_framebuffer");
+
+end GMA;