soc/amd/cezanne: select ACPI support and make the compiler happy

Follow-up patches will add more functionality.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I9b806569154e46418fa7d4fa35575a0acfec9132
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50273
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>

src/soc/amd/cezanne/Kconfig

@@ -16,6 +16,7 @@ config SOC_SPECIFIC_OPTIONS
 	select BOOT_DEVICE_SUPPORTS_WRITES if BOOT_DEVICE_SPI_FLASH
 	select FSP_COMPRESS_FSP_M_LZMA
 	select FSP_COMPRESS_FSP_S_LZMA
+	select HAVE_ACPI_TABLES
 	select HAVE_CF9_RESET
 	select HAVE_SMI_HANDLER
 	select IDT_IN_EVERY_STAGE

src/soc/amd/cezanne/Makefile.inc

@@ -24,6 +24,7 @@ romstage-y	+= reset.c
 romstage-y	+= romstage.c
 romstage-y	+= uart.c
 
+ramstage-y	+= acpi.c
 ramstage-y	+= chip.c
 ramstage-y	+= cpu.c
 ramstage-y	+= fch.c
@@ -37,6 +38,7 @@ ramstage-y	+= uart.c
 smm-y		+= smihandler.c
 
 CPPFLAGS_common += -I$(src)/soc/amd/cezanne/include
+CPPFLAGS_common += -I$(src)/soc/amd/cezanne/acpi
 CPPFLAGS_common += -I$(src)/vendorcode/amd/fsp/cezanne
 
 $(call strip_quotes,$(CONFIG_FSP_M_CBFS))-options := -b $(CONFIG_FSP_M_ADDR)

src/soc/amd/cezanne/acpi.c

@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/* ACPI - create the Fixed ACPI Description Tables (FADT) */
+
+#include <acpi/acpi.h>
+
+unsigned long acpi_fill_madt(unsigned long current)
+{
+	/* TODO */
+	return current;
+}
+
+/*
+ * Reference section 5.2.9 Fixed ACPI Description Table (FADT)
+ * in the ACPI 3.0b specification.
+ */
+void acpi_fill_fadt(acpi_fadt_t *fadt)
+{
+	/* TODO */
+}