src/mainboard/emulation/qemu-power9/*: add QEMU POWER9 mainboard

Add initial implementation for booting on QEMU POWER9 emulation.

Change-Id: I079c5b9ad564024dd13296ef75c263bdc40c9d39
Signed-off-by: Yaroslav Kurlaev <yaroslav.kurlaev@3mdeb.com>
Signed-off-by: Sergii Dmytruk <sergii.dmytruk@3mdeb.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57079
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michał Żygowski <michal.zygowski@3mdeb.com>

Documentation/mainboard/emulation/qemu-power9.md

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+# QEMU PPC64 emulator
+This page describes how to build and run coreboot for QEMU/PPC64.
+You can configure ELF payload via `make menuconfig` (make sure "ROM chip size"
+is large enough).
+
+## Running coreboot in QEMU
+```bash
+qemu-system-ppc64 -M powernv,hb-mode=on \
+                  -cpu power9 \
+                  -bios build/coreboot.rom \
+                  -drive file=build/coreboot.rom,if=mtd \
+                  -serial stdio \
+                  -display none
+```
+
+- The default CPU in QEMU for AArch64 is a 604. You specify a suitable
+PowerPC CPU via `-cpu power9`.
+- By default Hostboot mode is off and it needs to be turned on to run coreboot
+as a firmware rather than like an OS.
+- `-bios` specifies initial program (bootloader should suffice, but whole image
+works fine too).
+- `-drive` specifies image for emulated flash device.
+
+## Building coreboot
+```bash
+make defconfig KBUILD_DEFCONFIG=configs/config.emulation_qemu_power9
+make
+```
+
+This builds coreboot with no payload.

configs/config.emulation_qemu_power9

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+CONFIG_BOARD_EMULATION_QEMU_POWER9=y

src/mainboard/emulation/qemu-power9/Kconfig

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+## SPDX-License-Identifier: GPL-2.0-only
+
+# To execute, do:
+# qemu-system-ppc64 -M powernv --cpu power9 --bios 'build/coreboot.rom'
+
+if BOARD_EMULATION_QEMU_POWER9
+
+config BOARD_SPECIFIC_OPTIONS
+	def_bool y
+	select CPU_POWER9
+	select BOARD_ROMSIZE_KB_512
+	select ARCH_BOOTBLOCK_PPC64
+	select ARCH_VERSTAGE_PPC64
+	select ARCH_ROMSTAGE_PPC64
+	select ARCH_RAMSTAGE_PPC64
+	select BOOT_DEVICE_NOT_SPI_FLASH
+	select MISSING_BOARD_RESET
+
+config MEMLAYOUT_LD_FILE
+	string
+	default "src/mainboard/\$(CONFIG_MAINBOARD_DIR)/memlayout.ld"
+
+config MAINBOARD_DIR
+	string
+	default "emulation/qemu-power9"
+
+config MAINBOARD_PART_NUMBER
+	string
+	default "QEMU POWER9"
+
+config MAX_CPUS
+	int
+	default 1
+
+config MAINBOARD_VENDOR
+	string
+	default "Emulation"
+
+config DRAM_SIZE_MB
+	int
+	default 32768
+
+endif #  BOARD_EMULATION_QEMU_POWER9

src/mainboard/emulation/qemu-power9/Kconfig.name

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+config BOARD_EMULATION_QEMU_POWER9
+	bool "QEMU power9"

src/mainboard/emulation/qemu-power9/Makefile.inc

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+## SPDX-License-Identifier: GPL-2.0-only
+
+romstage-y += cbmem.c
+romstage-y += romstage.c

src/mainboard/emulation/qemu-power9/board_info.txt

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+Board name: QEMU POWER9
+Category: emulation

src/mainboard/emulation/qemu-power9/cbmem.c

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+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <cbmem.h>
+
+void *cbmem_top_chipset(void)
+{
+	/* Top of cbmem is at lowest usable DRAM address below 4GiB. */
+	/* For now, last 1M of 4G */
+	void *ptr = (void *) (4ULL * GiB - 1 * MiB);
+	return ptr;
+}

src/mainboard/emulation/qemu-power9/devicetree.cb

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+## SPDX-License-Identifier: GPL-2.0-only
+
+chip cpu/power9
+	device cpu_cluster 0 on end
+end

src/mainboard/emulation/qemu-power9/mainboard.c

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+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+#include <device/device.h>
+#include <cbmem.h>
+
+static void mainboard_enable(struct device *dev)
+{
+	if (!dev)
+		die("No dev0; die\n");
+}
+
+struct chip_operations mainboard_ops = {
+	.enable_dev = mainboard_enable,
+};

src/mainboard/emulation/qemu-power9/memlayout.ld

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+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <memlayout.h>
+
+#include <arch/header.ld>
+
+SECTIONS
+{
+	DRAM_START(0x0)
+
+	BOOTBLOCK(0, 32K)
+
+	STACK(0x8000, 32K)
+
+	PRERAM_CBMEM_CONSOLE(0x10000, 128K)
+	FMAP_CACHE(0x30000, 4K)
+	CBFS_MCACHE(0x31000, 8K)
+	TIMESTAMP(0x33000, 4K)
+	CBFS_CACHE(0x34000, 512K)
+	ROMSTAGE(0x100000, 1M)
+
+	RAMSTAGE(0x300000, 5M)
+}

src/mainboard/emulation/qemu-power9/romstage.c

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+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+#include <program_loading.h>
+
+void main(void)
+{
+	console_init();
+	run_ramstage();
+}