ramips: add support for Z-ROUTER ZR-2660

This commit adds support for Z-ROUTER ZR-2660 (also known as Routerich
AX1800) wireless WiFi 6 router.

Specification
-------------
- SoC       : MediaTek MT7621AT, MIPS, 880 MHz
- RAM       : 256 MiB
- Flash     : NAND 128 MiB (AMD/Spansion S34ML01G2)
- WLAN      :
  - 2.4 GHz : MediaTek MT7905D/MT7975 (14c3:7916), b/g/n/ax, MIMO 2x2
  - 5 GHz   : MediaTek MT7915E (14c3:7915), a/n/ac/ax, MIMO 2x2
- Ethernet  : 10/100/1000 Mbps x4 (1x WAN, 3x LAN)
- USB       : 1x 2.0
- UART      : 3.3V, 115200n8, pins are silkscreened on the pcb
- Buttons   : 1x Reset
- LEDs      : 1x WiFi 2.4 GHz (green)
              1x WiFi 5 GHz (green)
              1x LAN (green)
              1x WAN (green)
              1x WAN no-internet (red)
- Power     : 12 VDC, 1 A

Installation
------------
1. Run tftp server on your PC (IP: 192.168.2.2) and put OpenWrt initramfs
   image (initramfs.bin) to the tftp root dir
2. Open the following link in the browser to enable telnet:
	http://192.168.2.1/cgi-bin/telnet_ssh
3. Connect to the router (default IP: 192.168.2.1) using telnet shell
   (credentials - user:admin)
4. Run the following commands in the telnet shell (this will install
   OpenWrt initramfs image on nand flash):
	cd /tmp
	tftp -g -r initramfs.bin 192.168.2.2
	mtd write initramfs.bin firmware
	mtd erase firmware_backup
	reboot
5. Copy OpenWrt sysupgrade image (sysupgrade.bin) to the /tmp dir of the
   router
6. Connect to the router (IP: 192.168.1.1) using ssh shell and run
   sysupgrade command:
	sysupgrade -n /tmp/sysupgrade.bin

Return to stock
---------------
1. Copy stock firmware (stock.bin) to the /tmp dir of the router using scp
2. Run following command in the router shell:
	cd /tmp
	mtd write stock.bin firmware
	reboot

Recovery
--------
Connect uart (pins are silkscreened on the pcb), interrupt boot process by
pressing any key, use u-boot menu to flash stock firmware image or OpenWrt
initramfs image.

MAC addresses
-------------
+---------+-------------------+-----------+
|         | MAC               | Algorithm |
+---------+-------------------+-----------+
| LAN     | 24:0f:5e:xx:xx:4c | label     |
| WAN     | 24:0f:5e:xx:xx:4d | label+1   |
| WLAN 2g | 24:0f:5e:xx:xx:4e | label+2   |
| WLAN 5g | 24:0f:5e:xx:xx:4f | label+3   |
+---------+-------------------+-----------+
The WLAN 2.4 MAC was found in 'factory', 0x4
The LAN MAC was found in 'factory', 0xfff4
The WAN MAC was found in 'factory', 0xfffa

Signed-off-by: Mikhail Zhilkin <csharper2005@gmail.com>
(cherry picked from commit 1d3d6ef826)
Signed-off-by: Mikhail Zhilkin <csharper2005@gmail.com>

target/linux/ramips/dts/mt7621_z-router_zr-2660.dts

@@ -0,0 +1,211 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "mt7621.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/leds/common.h>
+
+/ {
+	compatible = "z-router,zr-2660", "mediatek,mt7621-soc";
+	model = "Z-ROUTER ZR-2660";
+
+	aliases {
+		label-mac-device = &gmac0;
+
+		led-boot = &led_power_green;
+		led-failsafe = &led_power_green;
+		led-running = &led_power_green;
+		led-upgrade = &led_power_green;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,115200";
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		key-0 {
+			label = "reset";
+			gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+			debounce-interval = <60>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led-0 {
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_WAN;
+			gpios = <&gpio 4 GPIO_ACTIVE_LOW>;
+		};
+
+		led-1 {
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_WLAN;
+			function-enumerator = <50>;
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy1tpt";
+		};
+
+		led-2 {
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_LAN;
+			gpios = <&gpio 14 GPIO_ACTIVE_LOW>;
+		};
+
+		led-3 {
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_WLAN;
+			function-enumerator = <24>;
+			gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy0tpt";
+		};
+
+		led-4 {
+			color = <LED_COLOR_ID_RED>;
+			function = LED_FUNCTION_WAN;
+			gpios = <&gpio 16 GPIO_ACTIVE_HIGH>;
+		};
+
+		led_power_green: led-5 {
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_POWER;
+			gpios = <&gpio 17 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&gmac0 {
+	nvmem-cells = <&macaddr_factory_3fff4>;
+	nvmem-cell-names = "mac-address";
+};
+
+&gmac1 {
+	status = "okay";
+	label = "wan";
+	phy-handle = <&ethphy4>;
+
+	nvmem-cells = <&macaddr_factory_3fffa>;
+	nvmem-cell-names = "mac-address";
+};
+
+&mdio {
+	ethphy4: ethernet-phy@4 {
+		reg = <4>;
+	};
+};
+
+&nand {
+	status = "okay";
+
+	mediatek,nmbm;
+	mediatek,bmt-max-ratio = <1>;
+	mediatek,bmt-max-reserved-blocks = <64>;
+
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		partition@0 {
+			label = "u-boot";
+			reg = <0x0 0x80000>;
+			read-only;
+		};
+
+		partition@80000 {
+			label = "Config";
+			reg = <0x80000 0x80000>;
+			read-only;
+		};
+
+		partition@100000 {
+			label = "factory";
+			reg = <0x100000 0x80000>;
+			read-only;
+
+			nvmem-layout {
+				compatible = "fixed-layout";
+				#address-cells = <1>;
+				#size-cells = <1>;
+
+				eeprom_factory_0: eeprom@0 {
+					reg = <0x0 0xe00>;
+				};
+
+				macaddr_factory_3fff4: macaddr@3fff4 {
+					reg = <0x3fff4 0x6>;
+				};
+
+				macaddr_factory_3fffa: macaddr@3fffa {
+					reg = <0x3fffa 0x6>;
+				};
+			};
+		};
+
+		partition@180000 {
+			label = "firmware";
+			reg = <0x180000 0x7680000>;
+
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "kernel";
+				reg = <0x0 0x400000>;
+			};
+
+			partition@400000 {
+				label = "ubi";
+				reg = <0x400000 0x7280000>;
+			};
+		};
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+&pcie1 {
+	wifi@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+
+		mediatek,disable-radar-background;
+
+		nvmem-cells = <&eeprom_factory_0>;
+		nvmem-cell-names = "eeprom";
+	};
+};
+
+&state_default {
+	gpio {
+		groups = "i2c", "jtag", "wdt";
+		function = "gpio";
+	};
+};
+
+&switch0 {
+	ports {
+		port@1 {
+			status = "okay";
+			label = "lan1";
+		};
+
+		port@2 {
+			status = "okay";
+			label = "lan2";
+		};
+
+		port@3 {
+			status = "okay";
+			label = "lan3";
+		};
+	};
+};

target/linux/ramips/image/mt7621.mk

@@ -2816,6 +2816,21 @@ define Device/yuncore_g720
 endef
 TARGET_DEVICES += yuncore_g720
 
+define Device/z-router_zr-2660
+  $(Device/dsa-migration)
+  $(Device/nand)
+  DEVICE_VENDOR := Z-ROUTER
+  DEVICE_MODEL := ZR-2660
+  DEVICE_ALT0_VENDOR := Routerich
+  DEVICE_ALT0_MODEL := AX1800
+  IMAGE_SIZE := 90112k
+  KERNEL_LOADADDR := 0x82000000
+  KERNEL := kernel-bin | relocate-kernel $(loadaddr-y) | lzma | \
+	fit lzma $$(KDIR)/image-$$(firstword $$(DEVICE_DTS)).dtb
+  DEVICE_PACKAGES += kmod-mt7915-firmware kmod-usb3 -uboot-envtools
+endef
+TARGET_DEVICES += z-router_zr-2660
+
 define Device/zbtlink_zbt-we1326
   $(Device/dsa-migration)
   $(Device/uimage-lzma-loader)

target/linux/ramips/mt7621/base-files/etc/board.d/01_leds

@@ -246,6 +246,11 @@ yuncore,ax820)
 	ucidef_set_led_netdev "lan" "LAN" "green:lan" "lan"
 	ucidef_set_led_netdev "wan" "WAN" "green:wan" "wan"
 	;;
+z-router,zr-2660)
+	ucidef_set_led_netdev "lan" "lan" "green:lan" "br-lan" "link tx rx"
+	ucidef_set_led_netdev "wan" "wan" "green:wan" "wan" "link tx rx"
+	ucidef_set_led_netdev "wan-off" "wan-off" "red:wan" "wan" "link"
+	;;
 zyxel,lte3301-plus)
 	ucidef_set_led_netdev "internet" "internet" "white:internet" "wwan0"
 	;;

target/linux/ramips/mt7621/base-files/etc/board.d/02_network

@@ -26,6 +26,7 @@ ramips_setup_interfaces()
 	xiaomi,mi-router-cr6608|\
 	xiaomi,mi-router-cr6609|\
 	xiaomi,redmi-router-ac2100|\
+	z-router,zr-2660|\
 	zyxel,wsm20)
 		ucidef_set_interfaces_lan_wan "lan1 lan2 lan3" "wan"
 		;;

target/linux/ramips/mt7621/base-files/etc/hotplug.d/ieee80211/10_fix_wifi_mac

@@ -71,7 +71,8 @@ case "$board" in
 			macaddr_setbit_la "$base_mac" > /sys${DEVPATH}/macaddress
 		fi
 		;;
-	glinet,gl-mt1300)
+	glinet,gl-mt1300|\
+	z-router,zr-2660)
 		[ "$PHYNBR" = "1" ] && \
 			macaddr_add "$(mtd_get_mac_binary factory 0x4)" 1 > /sys${DEVPATH}/macaddress
 		;;

target/linux/ramips/mt7621/base-files/lib/upgrade/platform.sh

@@ -118,6 +118,7 @@ platform_do_upgrade() {
 	xiaomi,mi-router-cr6608|\
 	xiaomi,mi-router-cr6609|\
 	xiaomi,redmi-router-ac2100|\
+	z-router,zr-2660|\
 	zyxel,nwa50ax|\
 	zyxel,nwa55axe)
 		nand_do_upgrade "$1"