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 <michal.simek@amd.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
Reviewed-by: Padmarao Begari <padmarao.begari@microchip.com>

2 files changed, 108 insertions, 0 deletions

diff --git a/arch/riscv/dts/Makefile b/arch/riscv/dts/Makefile
index be6c8a4..b05bb56 100644
--- a/arch/riscv/dts/Makefile
+++ b/arch/riscv/dts/Makefile
@@ -9,6 +9,8 @@ dtb-$(CONFIG_TARGET_SIFIVE_UNMATCHED) += hifive-unmatched-a00.dtb
 dtb-$(CONFIG_TARGET_SIPEED_MAIX) += k210-maix-bit.dtb
 dtb-$(CONFIG_TARGET_STARFIVE_VISIONFIVE2) += jh7110-starfive-visionfive-2.dtb
 dtb-$(CONFIG_TARGET_TH1520_LPI4A) += th1520-lichee-pi-4a.dtb
+dtb-$(CONFIG_TARGET_XILINX_MBV) += xilinx-mbv32.dtb
+
 include $(srctree)/scripts/Makefile.dts
 
 targets += $(dtb-y)
diff --git a/arch/riscv/dts/xilinx-mbv32.dts b/arch/riscv/dts/xilinx-mbv32.dts
new file mode 100644
index 0000000..6a6b8b6
--- /dev/null
+++ b/arch/riscv/dts/xilinx-mbv32.dts
@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * dts file for AMD MicroBlaze V
+ *
+ * (C) Copyright 2023, Advanced Micro Devices, Inc.
+ *
+ * Michal Simek <michal.simek@amd.com>
+ */
+
+/dts-v1/;
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+	model = "AMD MicroBlaze V 32bit";
+	compatible = "amd,mbv";
+
+	cpus: cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		timebase-frequency = <102000000>;
+		cpu_0: cpu@0 {
+			compatible = "amd,mbv32", "riscv";
+			device_type = "cpu";
+			reg = <0>;
+			riscv,isa = "rv32imafdc";
+			i-cache-size = <32768>;
+			d-cache-size = <32768>;
+			clock-frequency = <102000000>;
+			cpu0_intc: interrupt-controller {
+				compatible = "riscv,cpu-intc";
+				interrupt-controller;
+				#interrupt-cells = <1>;
+			};
+		};
+	};
+
+	aliases {
+		serial0 = &uart0;
+	};
+
+	chosen {
+		bootargs = "earlycon";
+		stdout-path = "serial0:115200n8";
+	};
+
+	memory@20000000 {
+		device_type = "memory";
+		reg = <0x20000000 0x20000000>;
+	};
+
+	clk102: clock {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <102000000>;
+	};
+
+	axi: axi {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "simple-bus";
+		ranges;
+		bootph-all;
+
+		axi_intc: interrupt-controller@41200000 {
+			compatible = "xlnx,xps-intc-1.00.a";
+			reg = <0x41200000 0x1000>;
+			interrupt-controller;
+			interrupt-parent = <&cpu0_intc>;
+			#interrupt-cells = <2>;
+			kind-of-intr = <0>;
+		};
+
+		xlnx_timer0: timer@41c00000 {
+			compatible = "xlnx,xps-timer-1.00.a";
+			reg = <0x41c00000 0x1000>;
+			interrupt-parent = <&axi_intc>;
+			interrupts = <1 2>;
+			bootph-all;
+			xlnx,one-timer-only = <0>;
+			clock-names = "s_axi_aclk";
+			clocks = <&clk102>;
+		};
+
+		xlnx_timer1: timer@41c20000 {
+			compatible = "xlnx,xps-timer-1.00.a";
+			reg = <0x41c20000 0x1000>;
+			interrupt-parent = <&axi_intc>;
+			interrupts = <0 2>;
+			xlnx,one-timer-only = <0>;
+			clock-names = "s_axi_aclk";
+			clocks = <&clk102>;
+		};
+
+		uart0: serial@40600000 {
+			compatible = "xlnx,xps-uartlite-1.00.a";
+			reg = <0x40600000 0x1000>;
+			interrupt-parent = <&axi_intc>;
+			interrupts = <2 2>;
+			bootph-all;
+			clocks = <&clk102>;
+			current-speed = <115200>;
+			xlnx,data-bits = <8>;
+			xlnx,use-parity = <0>;
+		};
+	};
+};