xref: /openbmc/linux/arch/arc/boot/dts/axc001.dtsi (revision cbecf716ca618fd44feda6bd9a64a8179d031fc5)

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2013-15 Synopsys, Inc. (www.synopsys.com)
 */

/*
 * Device tree for AXC001 770D/EM6/AS221 CPU card
 * Note that this file only supports the 770D CPU
 */

/include/ "skeleton.dtsi"

/ {
	compatible = "snps,arc";
	#address-cells = <2>;
	#size-cells = <2>;

	cpu_card {
		compatible = "simple-bus";
		#address-cells = <1>;
		#size-cells = <1>;

		ranges = <0x00000000 0x0 0xf0000000 0x10000000>;

		core_clk: core_clk {
			#clock-cells = <0>;
			compatible = "fixed-clock";
			clock-frequency = <750000000>;
		};

		input_clk: input-clk {
			#clock-cells = <0>;
			compatible = "fixed-clock";
			clock-frequency = <33333333>;
		};

		core_intc: arc700-intc@cpu {
			compatible = "snps,arc700-intc";
			interrupt-controller;
			#interrupt-cells = <1>;
		};

		/*
		 * this GPIO block ORs all interrupts on CPU card (creg,..)
		 * to uplink only 1 IRQ to ARC core intc
		 */
		dw-apb-gpio@2000 {
			compatible = "snps,dw-apb-gpio";
			reg = < 0x2000 0x80 >;
			#address-cells = <1>;
			#size-cells = <0>;

			ictl_intc: gpio-controller@0 {
				compatible = "snps,dw-apb-gpio-port";
				gpio-controller;
				#gpio-cells = <2>;
				snps,nr-gpios = <30>;
				reg = <0>;
				interrupt-controller;
				#interrupt-cells = <2>;
				interrupt-parent = <&core_intc>;
				interrupts = <15>;
			};
		};

		debug_uart: dw-apb-uart@5000 {
			compatible = "snps,dw-apb-uart";
			reg = <0x5000 0x100>;
			clock-frequency = <33333000>;
			interrupt-parent = <&ictl_intc>;
			interrupts = <19 4>;
			baud = <115200>;
			reg-shift = <2>;
			reg-io-width = <4>;
		};

		arcpct0: pct {
			compatible = "snps,arc700-pct";
		};
	};

	/*
	 * This INTC is actually connected to DW APB GPIO
	 * which acts as a wire between MB INTC and CPU INTC.
	 * GPIO INTC is configured in platform init code
	 * and here we mimic direct connection from MB INTC to
	 * CPU INTC, thus we set "interrupts = <7>" instead of
	 * "interrupts = <12>"
	 *
	 * This intc actually resides on MB, but we move it here to
	 * avoid duplicating the MB dtsi file given that IRQ from
	 * this intc to cpu intc are different for axs101 and axs103
	 */
	mb_intc: interrupt-controller@e0012000 {
		#interrupt-cells = <1>;
		compatible = "snps,dw-apb-ictl";
		reg = < 0x0 0xe0012000 0x0 0x200 >;
		interrupt-controller;
		interrupt-parent = <&core_intc>;
		interrupts = < 7 >;
	};

	memory {
		device_type = "memory";
		/* CONFIG_LINUX_RAM_BASE needs to match low mem start */
		reg = <0x0 0x80000000 0x0 0x1b000000>;	/* (512 - 32) MiB */
	};

	reserved-memory {
		#address-cells = <2>;
		#size-cells = <2>;
		ranges;
		/*
		 * We just move frame buffer area to the very end of
		 * available DDR. And even though in case of ARC770 there's
		 * no strict requirement for a frame-buffer to be in any
		 * particular location it allows us to use the same
		 * base board's DT node for ARC PGU as for ARc HS38.
		 */
		frame_buffer: frame_buffer@9e000000 {
			compatible = "shared-dma-pool";
			reg = <0x0 0x9e000000 0x0 0x2000000>;
			no-map;
		};
	};
};