ramips: add support for ZyXEL NWA50AX / NWA55AXE

Hardware
--------
CPU:    Mediatek MT7621
RAM:    256M DDR3
FLASH:  128M NAND
ETH:    1x Gigabit Ethernet
WiFi:   Mediatek MT7915 (2.4/5GHz 802.11ax 2x2 DBDC)
BTN:    1x Reset (NWA50AX only)
LED:    1x Multi-Color (NWA50AX only)

UART Console
------------
NWA50AX:
Available below the rubber cover next to the ethernet port.
NWA55AXE:
Available on the board when disassembling the device.

Settings: 115200 8N1

Layout:

<12V> <LAN> GND-RX-TX-VCC

Logic-Level is 3V3. Don't connect VCC to your UART adapter!

Installation Web-UI
-------------------
Upload the Factory image using the devices Web-Interface.

As the device uses a dual-image partition layout, OpenWrt can only
installed on Slot A. This requires the current active image prior
flashing the device to be on Slot B.

If the currently installed image is started from Slot A, the device will
flash OpenWrt to Slot B. OpenWrt will panic upon first boot in this case
and the device will return to the ZyXEL firmware upon next boot.

If this happens, first install a ZyXEL firmware upgrade of any version
and install OpenWrt after that.

Installation TFTP
-----------------
This installation routine is especially useful in case
 * unknown device password (NWA55AXE lacks reset button)
 * bricked device

Attach to the UART console header of the device. Interrupt the boot
procedure by pressing Enter.

The bootloader has a reduced command-set available from CLI, but more
commands can be executed by abusing the atns command.

Boot a OpenWrt initramfs image available on a TFTP server at
192.168.1.66. Rename the image to owrt.bin

 $ atnf owrt.bin
 $ atna 192.168.1.88
 $ atns "192.168.1.66; tftpboot; bootm"

Upon booting, set the booted image to the correct slot:

 $ zyxel-bootconfig /dev/mtd10 get-status
 $ zyxel-bootconfig /dev/mtd10 set-image-status 0 valid
 $ zyxel-bootconfig /dev/mtd10 set-active-image 0

Copy the OpenWrt ramboot-factory image to the device using scp.
Write the factory image to NAND and reboot the device.

 $ mtd write ramboot-factory.bin firmware
 $ reboot

Signed-off-by: David Bauer <mail@david-bauer.net>
(cherry picked from commit a0b7fef0ffe4cd9cca39a652a37e4f3ce8f0a681)

7 files changed, 248 insertions, 2 deletions

diff --git a/target/linux/ramips/dts/mt7621_zyxel_nwa-ax.dtsi b/target/linux/ramips/dts/mt7621_zyxel_nwa-ax.dtsi
new file mode 100644
index 0000000000..e1353346a8
--- /dev/null
+++ b/target/linux/ramips/dts/mt7621_zyxel_nwa-ax.dtsi
@@ -0,0 +1,151 @@
+#include "mt7621.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	aliases {
+		label-mac-device = &gmac0;
+	};
+};
+
+&nand {
+	status = "okay";
+
+	mediatek,nmbm;
+	mediatek,bmt-max-ratio = <15>;
+	mediatek,bmt-max-reserved-blocks = <64>;
+	mediatek,bmt-remap-range =
+		<0x0 0x980000>,
+		<0x2980000 0x7800000>;
+
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		partition@0 {
+			label = "u-boot";
+			reg = <0x0 0x80000>;
+			read-only;
+		};
+
+		partition@80000 {
+			label = "u-boot-env";
+			reg = <0x80000 0x80000>;
+			read-only;
+		};
+
+		factory: partition@100000 {
+			label = "factory";
+			reg = <0x100000 0x80000>;
+			read-only;
+		};
+
+		partition@180000 {
+			label = "firmware";
+			reg = <0x180000 0x2800000>;
+
+			/* This concatenates kernel1 & kernel2 & rootfs */
+
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "kernel";
+				reg = <0x0 0x800000>;
+			};
+
+			partition@400000 {
+				label = "ubi";
+				reg = <0x800000 0x2000000>;
+			};
+		};
+
+		partition@2980000 {
+			label = "zy_firmware_1";
+			reg = <0x2980000 0x2800000>;
+			read-only;
+		};
+
+		partition@5180000 {
+			label = "zy_rootfs_data";
+			reg = <0x5180000 0x1400000>;
+			read-only;
+		};
+
+		partition@6580000 {
+			label = "zy_logs";
+			reg = <0x6580000 0xd00000>;
+			read-only;
+		};
+
+		partition@7280000 {
+			label = "myzyxel";
+			reg = <0x7280000 0x480000>;
+			read-only;
+		};
+
+		partition@7700000 {
+			label = "bootconfig";
+			reg = <0x7700000 0x80000>;
+		};
+
+		mrd: partition@7780000 {
+			label = "mrd";
+			reg = <0x7780000 0x80000>;
+			read-only;
+		};
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+&pcie1 {
+	wlan_5g: wifi@0,0 {
+		reg = <0x0 0 0 0 0>;
+		compatible = "mediatek,mt76";
+
+		mediatek,mtd-eeprom = <&factory 0x0>;
+
+		/* MAC-Address set in userspace */
+	};
+};
+
+&gmac0 {
+	nvmem-cells = <&macaddr_mrd_1fff8>;
+	nvmem-cell-names = "mac-address";
+};
+
+&switch0 {
+	ports {
+		port@4 {
+			status = "okay";
+			label = "lan";
+		};
+	};
+};
+
+&mrd {
+	compatible = "nvmem-cells";
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	macaddr_mrd_1fff8: macaddr@1fff8 {
+		reg = <0x1fff8 0x6>;
+	};
+};
+
+&state_default {
+	gpio {
+		groups = "uart3", "rgmii2";
+		function = "gpio";
+	};
+};
+
+&ethernet {
+	pinctrl-0 = <&mdio_pins>, <&rgmii1_pins>;
+};
diff --git a/target/linux/ramips/dts/mt7621_zyxel_nwa50ax.dts b/target/linux/ramips/dts/mt7621_zyxel_nwa50ax.dts
new file mode 100644
index 0000000000..70323f2422
--- /dev/null
+++ b/target/linux/ramips/dts/mt7621_zyxel_nwa50ax.dts
@@ -0,0 +1,45 @@
+#include "mt7621_zyxel_nwa-ax.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "zyxel,nwa50ax", "mediatek,mt7621-soc";
+	model = "ZyXEL NWA50AX";
+
+	aliases {
+		led-boot = &led_system_green;
+		led-failsafe = &led_system_red;
+		led-running = &led_system_green;
+		led-upgrade = &led_system_red;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_system_red: system_red {
+			label = "red:system";
+			gpios = <&gpio 6 GPIO_ACTIVE_HIGH>;
+		};
+
+		led_system_green: system_green {
+			label = "green:system";
+			gpios = <&gpio 7 GPIO_ACTIVE_HIGH>;
+		};
+
+		system_blue {
+			label = "blue:system";
+			gpios = <&gpio 8 GPIO_ACTIVE_HIGH>;
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			gpios = <&gpio 30 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+};
diff --git a/target/linux/ramips/dts/mt7621_zyxel_nwa55axe.dts b/target/linux/ramips/dts/mt7621_zyxel_nwa55axe.dts
new file mode 100644
index 0000000000..04bbe340f2
--- /dev/null
+++ b/target/linux/ramips/dts/mt7621_zyxel_nwa55axe.dts
@@ -0,0 +1,6 @@
+#include "mt7621_zyxel_nwa-ax.dtsi"
+
+/ {
+	compatible = "zyxel,nwa55axe", "mediatek,mt7621-soc";
+	model = "ZyXEL NWA55AX";
+};
diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index c07ab39afd..a3bdacb32a 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -90,6 +90,13 @@ define Build/zytrx-header
 	mv $@.new $@
 endef
 
+define Build/zyxel-nwa-fit
+	$(TOPDIR)/scripts/mkits-zyxel-fit.sh \
+		$@.its $@ "6b e1 6f e1 ff ff ff ff ff ff"
+	PATH=$(LINUX_DIR)/scripts/dtc:$(PATH) mkimage -f $@.its $@.new
+	@mv $@.new $@
+endef
+
 define Device/dsa-migration
   DEVICE_COMPAT_VERSION := 1.1
   DEVICE_COMPAT_MESSAGE := Config cannot be migrated from swconfig to DSA
@@ -2193,6 +2200,33 @@ define Device/zyxel_nr7101
 endef
 TARGET_DEVICES += zyxel_nr7101
 
+define Device/zyxel_nwa-ax
+  $(Device/dsa-migration)
+  DEVICE_VENDOR := ZyXEL
+  BLOCKSIZE := 128k
+  PAGESIZE := 2048
+  KERNEL_SIZE := 8192k
+  UBINIZE_OPTS := -E 5
+  DEVICE_PACKAGES := kmod-mt7915e uboot-envtools zyxel-bootconfig
+  KERNEL := kernel-bin | lzma | fit lzma $$(KDIR)/image-$$(firstword $$(DEVICE_DTS)).dtb
+  IMAGES += factory.bin ramboot-factory.bin
+  IMAGE/factory.bin := append-kernel | pad-to $$(KERNEL_SIZE) | append-ubi | zyxel-nwa-fit
+  IMAGE/ramboot-factory.bin := append-kernel | pad-to $$(KERNEL_SIZE) | append-ubi
+  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
+endef
+
+define Device/zyxel_nwa50ax
+  $(Device/zyxel_nwa-ax)
+  DEVICE_MODEL := NWA50AX
+endef
+TARGET_DEVICES += zyxel_nwa50ax
+
+define Device/zyxel_nwa55axe
+  $(Device/zyxel_nwa-ax)
+  DEVICE_MODEL := NWA55AXE
+endef
+TARGET_DEVICES += zyxel_nwa55axe
+
 define Device/zyxel_wap6805
   $(Device/dsa-migration)
   BLOCKSIZE := 128k
diff --git a/target/linux/ramips/mt7621/base-files/etc/board.d/02_network b/target/linux/ramips/mt7621/base-files/etc/board.d/02_network
index 4b273e5a15..c285227080 100644
--- a/target/linux/ramips/mt7621/base-files/etc/board.d/02_network
+++ b/target/linux/ramips/mt7621/base-files/etc/board.d/02_network
@@ -21,7 +21,9 @@ ramips_setup_interfaces()
 	tplink,re650-v2|\
 	ubnt,unifi-6-lite|\
 	ubnt,unifi-flexhd|\
-	ubnt,unifi-nanohd)
+	ubnt,unifi-nanohd|\
+	zyxel,nwa50ax|\
+	zyxel,nwa55axe)
 		ucidef_set_interface_lan "lan"
 		;;
 	ampedwireless,ally-r1900k|\
diff --git a/target/linux/ramips/mt7621/base-files/etc/hotplug.d/ieee80211/10_fix_wifi_mac b/target/linux/ramips/mt7621/base-files/etc/hotplug.d/ieee80211/10_fix_wifi_mac
index 0e08fb6df3..b92a4dcda6 100644
--- a/target/linux/ramips/mt7621/base-files/etc/hotplug.d/ieee80211/10_fix_wifi_mac
+++ b/target/linux/ramips/mt7621/base-files/etc/hotplug.d/ieee80211/10_fix_wifi_mac
@@ -106,4 +106,10 @@ case "$board" in
 		[ "$PHYNBR" = "1" ] && \
 			macaddr_setbit_la "$(mtd_get_mac_binary Factory 0xe000)" > /sys${DEVPATH}/macaddress
 		;;
+	zyxel,nwa50ax|\
+	zyxel,nwa55axe)
+		hw_mac_addr="$(mtd_get_mac_binary mrd 0x1fff8)"
+		[ "$PHYNBR" = "0" ] && macaddr_add $hw_mac_addr 1 > /sys${DEVPATH}/macaddress
+		[ "$PHYNBR" = "1" ] && macaddr_add $hw_mac_addr 2 > /sys${DEVPATH}/macaddress
+		;;
 esac
diff --git a/target/linux/ramips/mt7621/base-files/lib/upgrade/platform.sh b/target/linux/ramips/mt7621/base-files/lib/upgrade/platform.sh
index cf3caff702..6cfc852c11 100755
--- a/target/linux/ramips/mt7621/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ramips/mt7621/base-files/lib/upgrade/platform.sh
@@ -95,7 +95,9 @@ platform_do_upgrade() {
 	xiaomi,mi-router-cr6606|\
 	xiaomi,mi-router-cr6608|\
 	xiaomi,mi-router-cr6609|\
-	xiaomi,redmi-router-ac2100)
+	xiaomi,redmi-router-ac2100|\
+	zyxel,nwa50ax|\
+	zyxel,nwa55axe)
 		nand_do_upgrade "$1"
 		;;
 	iodata,wn-ax1167gr2|\