riscv: dts: Add Tenstorrent Blackhole SoC PCIe cards

Add device tree source describing the Tenstorrent Blackhole SoC and the
Blackhole P100 and P150 PCIe cards. There are no differences between
the P100 and P150 cards from the perspective of an OS kernel like Linux
running on the X280 cores.

There is a virtual UART implemented in OpenSBI firmware that allows a
console program on the PCIe host to communicate through shared memory
with Linux running on the Blackhole card. CONFIG_HVC_RISCV_SBI needs to
be enabled. The boot script on the host adds 'console=hvc0' so that the
full boot output appears in the console program on the host.

Link: https://github.com/tenstorrent/opensbi/
Link: https://github.com/tenstorrent/tt-bh-linux
Reviewed-by: Joel Stanley <jms@oss.tenstorrent.com>
Signed-off-by: Drew Fustini <dfustini@oss.tenstorrent.com>

MAINTAINERS

@@ -22165,6 +22165,7 @@ L:	linux-riscv@lists.infradead.org
 S:	Maintained
 T:	git https://github.com/tenstorrent/linux.git
 F:	Documentation/devicetree/bindings/riscv/tenstorrent.yaml
+F:	arch/riscv/boot/dts/tenstorrent/
 
 RISC-V THEAD SoC SUPPORT
 M:	Drew Fustini <fustini@kernel.org>

arch/riscv/boot/dts/Makefile

@@ -9,4 +9,5 @@ subdir-y += sifive
 subdir-y += sophgo
 subdir-y += spacemit
 subdir-y += starfive
+subdir-y += tenstorrent
 subdir-y += thead

arch/riscv/boot/dts/tenstorrent/Makefile

@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+dtb-$(CONFIG_ARCH_TENSTORRENT) += blackhole-card.dtb

arch/riscv/boot/dts/tenstorrent/blackhole-card.dts

@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/dts-v1/;
+
+#include "blackhole.dtsi"
+
+/ {
+	model = "Tenstorrent Blackhole";
+	compatible = "tenstorrent,blackhole-card", "tenstorrent,blackhole";
+
+	memory@400030000000 {
+		device_type = "memory";
+		reg = <0x4000 0x30000000 0x1 0x00000000>;
+	};
+};

arch/riscv/boot/dts/tenstorrent/blackhole.dtsi

@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+// Copyright 2025 Tenstorrent AI ULC
+/dts-v1/;
+
+/ {
+	compatible = "tenstorrent,blackhole";
+	#address-cells = <2>;
+	#size-cells = <2>;
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		timebase-frequency = <50000000>;
+
+		cpu@0 {
+			compatible = "sifive,x280", "sifive,rocket0", "riscv";
+			device_type = "cpu";
+			reg = <0>;
+			mmu-type = "riscv,sv57";
+			riscv,isa-base = "rv64i";
+			riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "v", "zicsr",
+					       "zifencei", "zfh", "zba", "zbb", "sscofpmf";
+
+			cpu0_intc: interrupt-controller {
+				compatible = "riscv,cpu-intc";
+				#interrupt-cells = <1>;
+				interrupt-controller;
+			};
+		};
+
+		cpu@1 {
+			compatible = "sifive,x280", "sifive,rocket0", "riscv";
+			device_type = "cpu";
+			reg = <1>;
+			mmu-type = "riscv,sv57";
+			riscv,isa-base = "rv64i";
+			riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "v", "zicsr",
+					       "zifencei", "zfh", "zba", "zbb", "sscofpmf";
+
+			cpu1_intc: interrupt-controller {
+				compatible = "riscv,cpu-intc";
+				#interrupt-cells = <1>;
+				interrupt-controller;
+			};
+		};
+
+		cpu@2 {
+			compatible = "sifive,x280", "sifive,rocket0", "riscv";
+			device_type = "cpu";
+			reg = <2>;
+			mmu-type = "riscv,sv57";
+			riscv,isa-base = "rv64i";
+			riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "v", "zicsr",
+					       "zifencei", "zfh", "zba", "zbb", "sscofpmf";
+
+			cpu2_intc: interrupt-controller {
+				compatible = "riscv,cpu-intc";
+				#interrupt-cells = <1>;
+				interrupt-controller;
+			};
+		};
+
+		cpu@3 {
+			compatible = "sifive,x280", "sifive,rocket0", "riscv";
+			device_type = "cpu";
+			reg = <3>;
+			mmu-type = "riscv,sv57";
+			riscv,isa-base = "rv64i";
+			riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "v", "zicsr",
+					       "zifencei", "zfh", "zba", "zbb", "sscofpmf";
+
+			cpu3_intc: interrupt-controller {
+				compatible = "riscv,cpu-intc";
+				#interrupt-cells = <1>;
+				interrupt-controller;
+			};
+		};
+	};
+
+	soc {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		compatible = "simple-bus";
+		ranges;
+
+		clint0: timer@2000000 {
+			compatible = "tenstorrent,blackhole-clint", "sifive,clint0";
+			reg = <0x0 0x2000000 0x0 0x10000>;
+			interrupts-extended = <&cpu0_intc 0x3>, <&cpu0_intc 0x7>,
+					      <&cpu1_intc 0x3>, <&cpu1_intc 0x7>,
+					      <&cpu2_intc 0x3>, <&cpu2_intc 0x7>,
+					      <&cpu3_intc 0x3>, <&cpu3_intc 0x7>;
+		};
+
+		plic0: interrupt-controller@c000000 {
+			compatible = "tenstorrent,blackhole-plic", "sifive,plic-1.0.0";
+			reg = <0x0 0x0c000000 0x0 0x04000000>;
+			interrupts-extended = <&cpu0_intc 11>, <&cpu0_intc 9>,
+					      <&cpu1_intc 11>, <&cpu1_intc 9>,
+					      <&cpu2_intc 11>, <&cpu2_intc 9>,
+					      <&cpu3_intc 11>, <&cpu3_intc 9>;
+			interrupt-controller;
+			#interrupt-cells = <1>;
+			#address-cells = <0>;
+			riscv,ndev = <128>;
+		};
+	};
+};