mb/emulation/qemu-riscv: Enable ACPI by default

Select HAVE_ACPI_TABLES & PCI for QEMU riscv virt machine mainboard. Add
an empty dsdt.asl to fit current build process, but it will not actually
be used since QEMU has its own method of providing DSDT blob.

TEST=build and run successfully on QEMU rvvirt machine. Using command
"qemu-system-riscv64 -machine virt,aia=aplic-imsic,acpi=on -bios
build/coreboot.rom -nographic -pflash build/coreboot.rom".

Change-Id: If8c9b5d86adb69afdcb4bf320d6353b2b2acfb31
Signed-off-by: Ziang Wang <wangziang.ok@bytedance.com>
Signed-off-by: Dong Wei <weidong.wd@bytedance.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/89562
Reviewed-by: Maximilian Brune <maximilian.brune@9elements.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/emulation/qemu-riscv/Kconfig

@@ -38,6 +38,8 @@ config BOARD_SPECIFIC_OPTIONS
 	select RISCV_USE_ARCH_TIMER
 	select FLATTENED_DEVICE_TREE
 	select DRIVERS_EMULATION_QEMU_FW_CFG
+	select PCI
+	select HAVE_ACPI_TABLES
 
 config MEMLAYOUT_LD_FILE
 	string
@@ -49,6 +51,12 @@ config MAINBOARD_DIR
 config MAINBOARD_PART_NUMBER
 	default "QEMU RISCV"
 
+config ECAM_MMCONF_BASE_ADDRESS
+	default 0x30000000
+
+config ECAM_MMCONF_BUS_NUMBER
+	default 256
+
 config MAX_CPUS
 	int
 	default 512 # QEMUs current limit for the virt target

src/mainboard/emulation/qemu-riscv/Makefile.mk

@@ -23,5 +23,6 @@ ramstage-y += cbmem.c
 ramstage-y += chip.c
 ramstage-y += smp.c
 ramstage-y += mmio.c
+ramstage-$(CONFIG_HAVE_ACPI_TABLES) += acpi.c
 
 CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/include

src/mainboard/emulation/qemu-riscv/acpi.c

@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <acpi/acpi.h>
+#include <smbios.h>
+
+smbios_enclosure_type smbios_mainboard_enclosure_type(void)
+{
+	return SMBIOS_ENCLOSURE_MAIN_SERVER_CHASSIS;
+}
+
+void acpi_fill_fadt(acpi_fadt_t *fadt)
+{
+}
+
+unsigned long acpi_fill_madt(unsigned long current)
+{
+	return current;
+}

src/mainboard/emulation/qemu-riscv/dsdt.asl

@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+/*
+ * This DSDT source is meant to be empty since riscv qemu has its own
+ * method to retrieve DSDT blob via fw_cfg.
+ */
+
+#include <acpi/acpi.h>
+
+DefinitionBlock(
+	"dsdt.aml",
+	"DSDT",
+	ACPI_DSDT_REV_2,
+	OEM_ID,
+	ACPI_TABLE_CREATOR,
+	0x20110725	// OEM revision
+)
+{
+}