airoha: Add new target platform

Airoha is a new ARM platform based on Cortex-A53 which has recently been
merged into linux-next.

Due to BootROM limitations on this platform, the Cortex-A53 can't run in
Aarch64 mode and code must be compiled for 32-Bit ARM.

This support is based mostly on those linux-next commits backported
for kernel 5.15.

Patches:
1 - platform support = linux-next
2 - clock driver = linux-next
3 - gpio driver = linux-next
4 - linux,usable-memory-range dts support = linux-next
5 - mtd spinand driver
6 - spi driver
7 - pci driver (kconfig only, uses mediatek PCI) = linux-next

Still missing:
- Ethernet driver
- Sysupgrade support

A.t.m there exists one subtarget EN7523 with only one evaluation
board.

The initramfs can be run with the following commands from u-boot:
-
u-boot> setenv bootfile \
	openwrt-airoha-airoha_en7523-evb-initramfs-kernel.bin
u-boot> tftpboot
u-boot> bootm 0x81800000
-

Signed-off-by: Daniel Danzberger <daniel@dd-wrt.com>

2 files changed, 292 insertions, 0 deletions

diff --git a/target/linux/airoha/dts/en7523-evb.dts b/target/linux/airoha/dts/en7523-evb.dts
new file mode 100644
index 0000000000..f311c840e0
--- /dev/null
+++ b/target/linux/airoha/dts/en7523-evb.dts
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/dts-v1/;
+
+/* Bootloader installs ATF here */
+/memreserve/ 0x80000000 0x200000;
+
+#include "en7523.dtsi"
+
+/ {
+	model = "Airoha EN7523 Evaluation Board";
+	compatible = "airoha,en7523-evb", "airoha,en7523";
+
+	aliases {
+		serial0 = &uart1;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,115200 earlycon";
+		stdout-path = "serial0:115200n8";
+		linux,usable-memory-range = <0x80200000 0x1fe00000>;
+	};
+
+	memory@80000000 {
+		device_type = "memory";
+		reg = <0x80000000 0x20000000>;
+	};
+};
+
+&gpio0 {
+	status = "okay";
+};
+
+&gpio1 {
+	status = "okay";
+};
+
+&pcie0 {
+	status = "okay";
+};
+
+&pcie1 {
+	status = "okay";
+};
+
+&nand {
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		partition@0 {
+			label = "u-boot";
+			reg = <0x0 0x7C000>;
+			read-only;
+		};
+
+		partition@1 {
+			label = "u-boot-env";
+			reg = <0x7C000 0x4000>;
+		};
+
+		partition@2 {
+			label = "art";
+			reg = <0x80000 0x40000>;
+			read-only;
+		};
+
+		partition@3 {
+			label = "firmware";
+			reg = <0xC0000 0xDF40000>;
+		};
+	};
+};
diff --git a/target/linux/airoha/dts/en7523.dtsi b/target/linux/airoha/dts/en7523.dtsi
new file mode 100644
index 0000000000..72478b225c
--- /dev/null
+++ b/target/linux/airoha/dts/en7523.dtsi
@@ -0,0 +1,219 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+
+#include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/clock/en7523-clk.h>
+
+/ {
+	interrupt-parent = <&gic>;
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		npu_binary@84000000 {
+			no-map;
+			reg = <0x84000000 0xA00000>;
+		};
+
+		npu_flag@84B0000 {
+			no-map;
+			reg = <0x84B00000 0x100000>;
+		};
+
+		npu_pkt@85000000 {
+			no-map;
+			reg = <0x85000000 0x1A00000>;
+		};
+
+		npu_phyaddr@86B00000 {
+			no-map;
+			reg = <0x86B00000 0x100000>;
+		};
+
+		npu_rxdesc@86D00000 {
+			no-map;
+			reg = <0x86D00000 0x100000>;
+		};
+	};
+
+	psci {
+		compatible = "arm,psci-0.2";
+		method = "smc";
+	};
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu-map {
+			cluster0 {
+				core0 {
+					cpu = <&cpu0>;
+				};
+				core1 {
+					cpu = <&cpu1>;
+				};
+			};
+		};
+
+		cpu0: cpu@0 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a53";
+			reg = <0x0>;
+			enable-method = "psci";
+			clock-frequency = <80000000>;
+			next-level-cache = <&L2_0>;
+		};
+
+		cpu1: cpu@1 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a53";
+			reg = <0x1>;
+			enable-method = "psci";
+			clock-frequency = <80000000>;
+			next-level-cache = <&L2_0>;
+		};
+
+		L2_0: l2-cache0 {
+			compatible = "cache";
+		};
+	};
+
+	scu: system-controller@1fa20000 {
+		compatible = "airoha,en7523-scu";
+		reg = <0x1fa20000 0x400>,
+		      <0x1fb00000 0x1000>;
+		#clock-cells = <1>;
+	};
+
+	gic: interrupt-controller@9000000 {
+		compatible = "arm,gic-v3";
+		interrupt-controller;
+		#interrupt-cells = <3>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		reg = <0x09000000 0x20000>,
+		      <0x09080000 0x80000>,
+		      <0x09400000 0x2000>,
+		      <0x09500000 0x2000>,
+		      <0x09600000 0x20000>;
+		interrupts = <GIC_PPI 9 IRQ_TYPE_LEVEL_LOW>;
+	};
+
+	timer {
+		compatible = "arm,armv8-timer";
+		interrupt-parent = <&gic>;
+		interrupts = <GIC_PPI 13 IRQ_TYPE_LEVEL_LOW>,
+			     <GIC_PPI 14 IRQ_TYPE_LEVEL_LOW>,
+			     <GIC_PPI 11 IRQ_TYPE_LEVEL_LOW>,
+			     <GIC_PPI 10 IRQ_TYPE_LEVEL_LOW>;
+	};
+
+	uart1: serial@1fbf0000 {
+		compatible = "ns16550";
+		reg = <0x1fbf0000 0x30>;
+		reg-io-width = <4>;
+		reg-shift = <2>;
+		interrupts = <GIC_SPI 18 IRQ_TYPE_LEVEL_HIGH>;
+		clock-frequency = <1843200>;
+		status = "okay";
+	};
+
+	gpio0: gpio@1fbf0200 {
+		compatible = "airoha,en7523-gpio";
+		reg = <0x1fbf0204 0x4>,
+		      <0x1fbf0200 0x4>,
+		      <0x1fbf0220 0x4>,
+		      <0x1fbf0214 0x4>;
+		gpio-controller;
+		#gpio-cells = <2>;
+	};
+
+	gpio1: gpio@1fbf0270 {
+		compatible = "airoha,en7523-gpio";
+		reg = <0x1fbf0270 0x4>,
+		      <0x1fbf0260 0x4>,
+		      <0x1fbf0264 0x4>,
+		      <0x1fbf0278 0x4>;
+		gpio-controller;
+		#gpio-cells = <2>;
+	};
+
+	pcie0: pcie@1fa91000 {
+		compatible = "airoha,en7523-pcie", "mediatek,mt7622-pcie";
+		device_type = "pci";
+		reg = <0x1fa91000 0x1000>;
+		reg-names = "port0";
+		linux,pci-domain = <0>;
+		#address-cells = <3>;
+		#size-cells = <2>;
+		interrupts = <GIC_SPI 39 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-names = "pcie_irq";
+		clocks = <&scu EN7523_CLK_PCIE>;
+		clock-names = "sys_ck0";
+		bus-range = <0x00 0xff>;
+		ranges = <0x82000000 0 0x20000000  0x20000000  0 0x8000000>;
+		status = "disabled";
+
+		#interrupt-cells = <1>;
+		interrupt-map-mask = <0 0 0 7>;
+		interrupt-map = <0 0 0 1 &pcie_intc0 0>,
+				<0 0 0 2 &pcie_intc0 1>,
+				<0 0 0 3 &pcie_intc0 2>,
+				<0 0 0 4 &pcie_intc0 3>;
+		pcie_intc0: interrupt-controller {
+			interrupt-controller;
+			#address-cells = <0>;
+			#interrupt-cells = <1>;
+		};
+	};
+
+	pcie1: pcie@1fa92000 {
+		compatible = "airoha,en7523-pcie", "mediatek,mt7622-pcie";
+		device_type = "pci";
+		reg = <0x1fa92000 0x1000>;
+		reg-names = "port1";
+		linux,pci-domain = <1>;
+		#address-cells = <3>;
+		#size-cells = <2>;
+		interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-names = "pcie_irq";
+		clocks = <&scu EN7523_CLK_PCIE>;
+		clock-names = "sys_ck1";
+		bus-range = <0x00 0xff>;
+		ranges = <0x82000000 0 0x28000000  0x28000000  0 0x8000000>;
+		status = "disabled";
+
+		#interrupt-cells = <1>;
+		interrupt-map-mask = <0 0 0 7>;
+		interrupt-map = <0 0 0 1 &pcie_intc1 0>,
+				<0 0 0 2 &pcie_intc1 1>,
+				<0 0 0 3 &pcie_intc1 2>,
+				<0 0 0 4 &pcie_intc1 3>;
+		pcie_intc1: interrupt-controller {
+			interrupt-controller;
+			#address-cells = <0>;
+			#interrupt-cells = <1>;
+		};
+	};
+
+	spi_ctrl: spi_controller@1fa10000 {
+		compatible = "airoha,en7523-spi";
+		reg = <0x1fa10000 0x140>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		spi-rx-bus-width = <2>;
+		spi-tx-bus-width = <2>;
+
+		nand: nand@0 {
+			compatible = "spi-nand";
+			reg = <0>;
+			nand-ecc-engine = <&nand>;
+		};
+	};
+};