drivers/intel/gma, soc/intel/common: improve cooperation

Instead of both featuring their own VBT loaders, use a single one.
It's the compression-enabled one from soc/intel/common, but moved to
drivers/intel/gma.

The rationale (besides making all the Kconfig fluff easier) is that
drivers/intel/gma is used in some capacity on all platforms that load a
VBT, while soc/intel/common's VBT code is for use with FSP.

BUG=b:79365806
TEST=GOOGLE_FALCO and GOOGLE_CHELL both build, exercising both affected
code paths.

Change-Id: I8d149c8b480e457a4f3e947f46d49ab45c65ccdc
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/26039
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/drivers/intel/gma/opregion.h b/src/drivers/intel/gma/opregion.h
index 8ef3dcf9be..e6d8648527 100644
--- a/src/drivers/intel/gma/opregion.h
+++ b/src/drivers/intel/gma/opregion.h
@@ -253,4 +253,18 @@ uintptr_t gma_get_gnvs_aslb(const void *gnvs);
 void gma_set_gnvs_aslb(void *gnvs, uintptr_t aslb);
 enum cb_err intel_gma_init_igd_opregion(igd_opregion_t *opregion);
 
+/*
+ * Returns the CBFS filename of the VBT blob.
+ *
+ * The default implementation returns "vbt.bin", but other implementations can
+ * override this.
+ */
+const char *mainboard_vbt_filename(void);
+
+/*
+ * locate vbt.bin file. Returns a pointer to its content.
+ * If vbt_size is non-NULL, also return the vbt's size.
+ */
+void *locate_vbt(size_t *vbt_size);
+
 #endif /* _COMMON_GMA_H_ */