ARC: Add support for nSIM OSCI System C model

This adds support for an ARC Virtual Platform. This platform is based on the
System C standard promoted by the OSCI (Open System C Initiative) and uses
nSIM to simulate the ARC CPU core itself.

Users can build a virtual SoC by combining System C models of peripherals
and CPU cores.

Signed-off-by: Mischa Jonker <mjonker@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

arch/arc/boot/dts/nsimosci.dts

@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+/dts-v1/;
+
+/include/ "skeleton.dtsi"
+
+/ {
+	compatible = "snps,nsimosci";
+	clock-frequency = <80000000>;	/* 80 MHZ */
+	#address-cells = <1>;
+	#size-cells = <1>;
+	interrupt-parent = <&intc>;
+
+	chosen {
+		bootargs = "console=tty0 consoleblank=0";
+	};
+
+	aliases {
+		serial0 = &uart0;
+	};
+
+	memory {
+		device_type = "memory";
+		reg = <0x80000000 0x10000000>;	/* 256M */
+	};
+
+	fpga {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		/* child and parent address space 1:1 mapped */
+		ranges;
+
+		intc: interrupt-controller {
+			compatible = "snps,arc700-intc";
+			interrupt-controller;
+			#interrupt-cells = <1>;
+		};
+
+		uart0: serial@c0000000 {
+			compatible = "snps,dw-apb-uart";
+			reg = <0xc0000000 0x2000>;
+			interrupts = <11>;
+			#clock-frequency = <80000000>;
+			clock-frequency = <3686400>;
+			baud = <115200>;
+			reg-shift = <2>;
+			reg-io-width = <4>;
+			status = "okay";
+		};
+
+		pgu0: pgu@c9000000 {
+			compatible = "snps,arcpgufb";
+			reg = <0xc9000000 0x400>;
+		};
+
+		ps2: ps2@c9001000 {
+			compatible = "snps,arc_ps2";
+			reg = <0xc9000400 0x14>;
+			interrupts = <13>;
+			interrupt-names = "arc_ps2_irq";
+		};
+
+		eth0: ethernet@c0003000 {
+			compatible = "snps,oscilan";
+			reg = <0xc0003000 0x44>;
+			interrupts = <7>, <8>;
+			interrupt-names = "rx", "tx";
+		};
+	};
+};