mainboard/emulation/qemu-sbsa: Add qemu-sbsa board

Add coreboot support for qemu's sbsa-ref (Server Base System
Architecture) machine (-m sbsa-ref).

The qemu-sbsa coreboot port runs on EL2 and is the payload of the
EL3 firmware (Arm Trusted Firmware).

Note that, coreboot expects a pointer to the FDT in x0. Make sure
to configure TF-A to handoff the FDT pointer.

Example qemu commandline:

  qemu-system-aarch64 -nographic -m 2048 -M sbsa-ref \
                      -pflash <path/to/TFA.fd> \
                      -pflash <path/to/coreboot.rom>

The Documentation can be found here:
Documentation/mainboard/emulation/qemu-sbsa.md

Change-Id: Iacc9aaf065e0d153336cbef9a9b5b46a9eb24a53
Signed-off-by: David Milosevic <David.Milosevic@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79086
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/src/mainboard/emulation/qemu-sbsa/bootblock.c b/src/mainboard/emulation/qemu-sbsa/bootblock.c
new file mode 100644
index 0000000000..b38df6ec71
--- /dev/null
+++ b/src/mainboard/emulation/qemu-sbsa/bootblock.c
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <arch/mmu.h>
+#include <bootblock_common.h>
+#include <symbols.h>
+
+void bootblock_mainboard_init(void)
+{
+	mmu_init();
+
+	/* Everything below DRAM is device memory */
+	mmu_config_range((void *)0, (uintptr_t)_dram, MA_DEV | MA_RW);
+	/* Set a dummy value for DRAM. ramstage should update the mapping. */
+	mmu_config_range(_dram, ((size_t) CONFIG_DRAM_SIZE_MB) * MiB, MA_MEM | MA_RW);
+
+	mmu_config_range(_ttb, REGION_SIZE(ttb), MA_MEM | MA_S | MA_RW);
+	mmu_config_range(_bootblock, REGION_SIZE(bootblock), MA_MEM | MA_S | MA_RW);
+	mmu_config_range(_ramstage, REGION_SIZE(ramstage), MA_MEM | MA_S | MA_RW);
+	mmu_config_range((void *)CONFIG_ECAM_MMCONF_BASE_ADDRESS, CONFIG_ECAM_MMCONF_LENGTH,
+			 MA_DEV | MA_RW);
+	mmu_enable();
+}