riscv: Add support for AMD/Xilinx MicroBlaze V

MicroBlaze V is new AMD/Xilinx soft-core 32bit RISC-V processor IP.
It is hardware compatible with classic MicroBlaze processor.

The patch contains initial wiring and configuration for initial HW design
with memory, cpu, interrupt controller, timers and uartlite console
(interrupt controller is listed but U-Boot is not using it).

Provided DT is just describing one configuration and should be taken only
as example.

Signed-off-by: Michal Simek <[email protected]>
Reviewed-by: Leo Yu-Chi Liang <[email protected]>
Reviewed-by: Padmarao Begari <[email protected]>

6 files changed, 58 insertions, 1 deletions

diff --git a/board/xilinx/Kconfig b/board/xilinx/Kconfig
index 4f0776e8bd9..843198fa0da 100644
--- a/board/xilinx/Kconfig
+++ b/board/xilinx/Kconfig
@@ -51,10 +51,11 @@ config XILINX_OF_BOARD_DTB_ADDR
 
 config BOOT_SCRIPT_OFFSET
 	hex "Boot script offset"
-	depends on ARCH_ZYNQ || ARCH_ZYNQMP || ARCH_VERSAL || ARCH_VERSAL_NET || MICROBLAZE
+	depends on ARCH_ZYNQ || ARCH_ZYNQMP || ARCH_VERSAL || ARCH_VERSAL_NET || MICROBLAZE || TARGET_XILINX_MBV
 	default 0xFC0000 if ARCH_ZYNQ || MICROBLAZE
 	default 0x3E80000 if ARCH_ZYNQMP
 	default 0x7F80000 if ARCH_VERSAL || ARCH_VERSAL_NET
+	default 0 if TARGET_XILINX_MBV
 	help
 	   Specifies distro boot script offset in NAND/QSPI/NOR flash.
 
diff --git a/board/xilinx/common/board.c b/board/xilinx/common/board.c
index 9309b071269..12a877c7154 100644
--- a/board/xilinx/common/board.c
+++ b/board/xilinx/common/board.c
@@ -652,6 +652,11 @@ int embedded_dtb_select(void)
 #endif
 
 #if defined(CONFIG_LMB)
+
+#ifndef MMU_SECTION_SIZE
+#define MMU_SECTION_SIZE        (1 * 1024 * 1024)
+#endif
+
 phys_addr_t board_get_usable_ram_top(phys_size_t total_size)
 {
 	phys_size_t size;
diff --git a/board/xilinx/mbv/Kconfig b/board/xilinx/mbv/Kconfig
new file mode 100644
index 00000000000..4bc9f72c541
--- /dev/null
+++ b/board/xilinx/mbv/Kconfig
@@ -0,0 +1,28 @@
+if TARGET_XILINX_MBV
+
+config SYS_BOARD
+	default "mbv"
+
+config SYS_VENDOR
+	default "xilinx"
+
+config SYS_CPU
+	default "generic"
+
+config SYS_CONFIG_NAME
+	default "xilinx_mbv"
+
+config TEXT_BASE
+	default 0x80000000 if !RISCV_SMODE
+	default 0x80400000 if RISCV_SMODE && ARCH_RV32I
+
+config BOARD_SPECIFIC_OPTIONS
+	def_bool y
+	select GENERIC_RISCV
+	imply BOARD_LATE_INIT
+	imply CMD_SBI
+	imply CMD_PING
+
+source "board/xilinx/Kconfig"
+
+endif
diff --git a/board/xilinx/mbv/MAINTAINERS b/board/xilinx/mbv/MAINTAINERS
new file mode 100644
index 00000000000..445654fe740
--- /dev/null
+++ b/board/xilinx/mbv/MAINTAINERS
@@ -0,0 +1,7 @@
+XILINX MicroBlaze V BOARD
+M:	Michal Simek <[email protected]>
+S:	Maintained
+F:	arch/riscv/dts/xilinx-mbv*
+F:	board/xilinx/mbv/
+F:	configs/xilinx_mbv*
+F:	include/configs/xilinx_mbv.h
diff --git a/board/xilinx/mbv/Makefile b/board/xilinx/mbv/Makefile
new file mode 100644
index 00000000000..e2fc0c69715
--- /dev/null
+++ b/board/xilinx/mbv/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# (C) Copyright 2023, Advanced Micro Devices, Inc.
+
+obj-y	+= board.o
diff --git a/board/xilinx/mbv/board.c b/board/xilinx/mbv/board.c
new file mode 100644
index 00000000000..ccf4395d6ac
--- /dev/null
+++ b/board/xilinx/mbv/board.c
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2023, Advanced Micro Devices, Inc.
+ *
+ * Michal Simek <[email protected]>
+ */
+
+int board_init(void)
+{
+	return 0;
+}