vc/google: Show different logos for different ChromeOS devices

This commit adds support for showing different logos on the ChromeOS
firmware splash screen based on the device model (between
Chromebook-Plus and regular ChromeOS devices like Chromebook and
Chromebox). This allows OEMs to customize the branding on their
devices.

This patch also introduces three new Kconfigs:
 - CHROMEOS_FW_SPLASH_SCREEN
 - CHROMEOS_LOGO_PATH
 - CHROMEBOOK_PLUS_LOGO_PATH
which allow users to enable the fw splash screen feature in the
vendorcode. Previously, we were using the BMP_LOGO Kconfig in
drivers/intel/fsp2_0, but we didn't want the top level Kconfigs to be
located inside the architecture specific files.

BUG=b:317880956
BRANCH=None
TEST=emerge-rex coreboot chromeos-bootimage
     verify that FW splash screen appears

Change-Id: I56613d1e7e81e25b31ad034edae0f716c94c4960
Signed-off-by: Shelley Chen <shchen@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79775
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>

src/vendorcode/google/chromeos/Kconfig

@@ -79,5 +79,28 @@ config CHROMEOS_NVS
 	bool
 	depends on ACPI_SOC_NVS
 
+config CHROMEOS_FW_SPLASH_SCREEN
+	bool "Display Splash Screen in firmware"
+	default n
+	select BMP_LOGO
+	select HAVE_CUSTOM_BMP_LOGO
+	help
+	  Select this option to display the manufacturer's logo or
+	  custom image (OEM splash screen) early in the boot process.
+	  This can enhance the user experience by providing visual
+	  feedback while the system starts up. For example, ChromeOS
+	  devices use this option to show their logo before the operating
+	  system loads.
+
+config CHROMEOS_LOGO_PATH
+	string "Path to ChromeOS logo file"
+	depends on CHROMEOS_FW_SPLASH_SCREEN
+	default "3rdparty/blobs/mainboard/\$(MAINBOARDDIR)/logo.bmp"
+
+config CHROMEBOOK_PLUS_LOGO_PATH
+	string "Path to Chromebook Plus logo file"
+	depends on CHROMEOS_FW_SPLASH_SCREEN
+	default "3rdparty/blobs/mainboard/\$(MAINBOARDDIR)/logo.bmp"
+
 endif # CHROMEOS
 endmenu

src/vendorcode/google/chromeos/Makefile.inc

@@ -20,3 +20,15 @@ romstage-y += watchdog.c
 ramstage-y += watchdog.c
 
 romstage-$(CONFIG_CHROMEOS_DRAM_PART_NUMBER_IN_CBI) += dram_part_num_override.c
+ramstage-$(CONFIG_CHROMEOS_FW_SPLASH_SCREEN) += splash.c
+
+# Add logo to the cbfs image
+cbfs-files-$(CONFIG_CHROMEOS_FW_SPLASH_SCREEN) += cb_logo.bmp
+cb_logo.bmp-file := $(call strip_quotes,$(CONFIG_CHROMEOS_LOGO_PATH))
+cb_logo.bmp-type := raw
+cb_logo.bmp-compression := $(CBFS_COMPRESS_FLAG)
+
+cbfs-files-$(CONFIG_CHROMEOS_FW_SPLASH_SCREEN) += cb_plus_logo.bmp
+cb_plus_logo.bmp-file := $(call strip_quotes,$(CONFIG_CHROMEBOOK_PLUS_LOGO_PATH))
+cb_plus_logo.bmp-type := raw
+cb_plus_logo.bmp-compression := $(CBFS_COMPRESS_FLAG)

src/vendorcode/google/chromeos/splash.c

@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <bootsplash.h>
+#include <vendorcode/google/chromeos/chromeos.h>
+
+const char *bmp_logo_filename(void)
+{
+	if (chromeos_device_branded_plus())
+		return "cb_plus_logo.bmp";
+	else
+		return "cb_logo.bmp";
+}