soc/intel/common/block: Add Intel VGA early graphics support

This patch introduces an early graphics driver which can be used in
romstage in cache-as-ram mode. The implementation relies on
`libgfxinit' and provide VGA text mode support.

SoCs wanting to take advantage of this driver must implement the
`early_graphics_soc_panel_init' function to set the panel power
sequence timing parameters.

BUG=b:252792591
BRANCH=firmware-brya-14505.B
TEST=Graphics bring up observed on skolas with extra patches

Change-Id: Ie4ad1215e5fadd0adc1271b6bd6ddb0ea258cb5b
Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70299
Reviewed-by: Tarun Tuli <taruntuli@google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Maulik Vaghela <maulikvaghela@google.com>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 28 insertions, 0 deletions

diff --git a/src/soc/intel/common/block/include/intelblocks/early_graphics.h b/src/soc/intel/common/block/include/intelblocks/early_graphics.h
new file mode 100644
index 0000000000..c0313cf960
--- /dev/null
+++ b/src/soc/intel/common/block/include/intelblocks/early_graphics.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef SOC_INTEL_COMMON_BLOCK_GRAPHICS_EARLY_H
+#define SOC_INTEL_COMMON_BLOCK_GRAPHICS_EARLY_H
+
+#include <stdbool.h>
+
+/*
+ * SoC override
+ *
+ * All new SoC must implement below functionality.
+ */
+
+/* Configure display panel */
+void early_graphics_soc_panel_init(void);
+
+/*
+ * Early graphics module API
+ * Graphics at this stage is limited to VGA text mode.
+ */
+
+/* Initialize graphics.  Return true if VGA text mode is ready to use. */
+bool early_graphics_init(void);
+
+/* Clear graphics configuration, turn off the displays. */
+void early_graphics_stop(void);
+
+#endif	/* SOC_INTEL_COMMON_BLOCK_GRAPHICS_EARLY_H */