soc/amd/common: Add a common graphics block device driver for AMD SoCs

This change adds a common graphics block device driver for AMD
SoCs. In follow-up CLs, this driver will be utilized for Picasso.

This driver is added to enable ACPI name and SSDT generation for
graphics controller.

BUG=b:153858769

Change-Id: I45e2b98fede41e49158d9ff9f93785a34c392c22
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40675
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

src/soc/amd/common/block/graphics/Kconfig

@@ -0,0 +1,5 @@
+config SOC_AMD_COMMON_BLOCK_GRAPHICS
+	bool
+	default n
+	help
+	  Select this option to use AMD common graphics driver support.

src/soc/amd/common/block/graphics/Makefile.inc

@@ -0,0 +1 @@
+ramstage-$(CONFIG_SOC_AMD_COMMON_BLOCK_GRAPHICS) += graphics.c

src/soc/amd/common/block/graphics/graphics.c

@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* This file is part of the coreboot project. */
+
+#include <device/pci.h>
+#include <device/pci_ids.h>
+
+static const char *graphics_acpi_name(const struct device *dev)
+{
+	return "IGFX";
+}
+
+static const struct device_operations graphics_ops = {
+	.read_resources		= pci_dev_read_resources,
+	.set_resources		= pci_dev_set_resources,
+	.enable_resources	= pci_dev_enable_resources,
+	.init			= pci_dev_init,
+	.ops_pci		= &pci_dev_ops_pci,
+	.write_acpi_tables	= pci_rom_write_acpi_tables,
+	.acpi_fill_ssdt		= pci_rom_ssdt,
+	.acpi_name		= graphics_acpi_name,
+};
+
+static const unsigned short pci_device_ids[] = {
+	0,
+};
+
+static const struct pci_driver graphics_driver __pci_driver = {
+	.ops		= &graphics_ops,
+	.vendor		= PCI_VENDOR_ID_ATI,
+	.devices	= pci_device_ids,
+};