mediatek: add Comfast CF-E393AX support

Comfast CF-E393AX is a dual-band Wi-Fi 6 POE ceiling mount access point.

Oem firmware is a custom openwrt 21.02 snapshot version.

We can gain access via ssh once we remove the root password.

Hardware specification:
  SoC: MediaTek MT7981A 2x A53
  Flash: 128 MB SPI-NAND
  RAM: 256MB DDR3
  Ethernet: 1x 10/100/1000 Mbps built-in PHY (WAN)
            1x 10/100/1000/2500 Mbps MaxLinear GPY211C (LAN)
  Switch: MediaTek MT7531AE
  WiFi: MediaTek MT7976D
  LEDS: 1x (Red, Blue and Green)
  Button: Reset
  UART: 3.3v, 115200n8
  --------------------------
  | Layout |
  | ----------------- |
  | 4 | VCC GND TX RX | <= |
  | ----------------- |
  --------------------------

Gain SSH access:
1. Login into web interface (http://apipaddress/computer/login.html),
   and download the
   configuration(http://apipaddress/computer/config.html).

2. Rename downloaded backup config - 'backup.file to backup.tar.gz',
   Enter 'fakeroot' command then decompress the configuration:
   tar -zxf backup.tar.gz

3. Edit 'etc/shadow', update (remove) root password:
   With password =
   'root:$1$xf7D0Hfg$5gkjmvgQe4qJbe1fi/VLy1:19362:0:99999:7:::'
   'root:$1$xf7D0Hfg$5gkjmvgQe4qJbe1fi/VLy1:19362:0:99999:7:::'
   to
   Without password =
   'root::0:99999:7:::'
   'root::0:99999:7:::'

4. Repack 'etc' directory back to a new backup file:
   tar -zcf backup-ssh.tar.gz etc/
5. Rename new config tar.gz file to 'backup-ssh.file'
   Exit fakeroot - 'exit'

6. Upload new configuration via web interface, now you
   can SSH with the following:

   'ssh -vv -o HostKeyAlgorithms=+ssh-rsa \
   -o PubkeyAcceptedAlgorithms=+ssh-rsa root@192.168.10.1'.

   Backup the mtd partitions
   - https://openwrt.org/docs/guide-user/installation/generic.backup

7. Copy openwrt factory firmware to the tmp folder to install via ssh:

   'scp -o HostKeyAlgorithms=+ssh-rsa \
   -o PubkeyAcceptedAlgorithms=+ssh-rsa \
   *-mediatek-filogic-comfast_cf-e393ax-squashfs-factory.bin \
   root@192.168.10.1:/tmp/'

   'sysupgrade -n -F \
   /tmp/*--mediatek-filogic-comfast_cf-e393ax-squashfs-factory.bin'

8. Once led has stopped flashing - Connect via ssh with the
   default openwrt ip address - 'ssh root@192.168.1.1'

9. SSH copy the openwrt sysupgrade firmware and upgrade
   as per the default instructions.

Signed-off-by: David Bentham <db260179@gmail.com>

4 files changed, 281 insertions, 0 deletions

diff --git a/target/linux/mediatek/dts/mt7981a-comfast-cf-e393ax.dts b/target/linux/mediatek/dts/mt7981a-comfast-cf-e393ax.dts
new file mode 100644
index 00000000000..7445b610dcc
--- /dev/null
+++ b/target/linux/mediatek/dts/mt7981a-comfast-cf-e393ax.dts
@@ -0,0 +1,250 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+/dts-v1/;
+#include "mt7981.dtsi"
+
+/ {
+	model = "COMFAST CF-E393AX";
+	compatible = "comfast,cf-e393ax", "mediatek,mt7981";
+
+	aliases {
+		serial0 = &uart0;
+		led-boot = &led_red;
+		led-failsafe = &led_red;
+		led-running = &led_blue;
+		led-upgrade = &led_green;
+	};
+
+	chosen {
+		bootargs-override = "console=ttyS0,115200n8";
+		stdout-path = "serial0:115200n8";
+	};
+
+	memory {
+		reg = <0 0x40000000 0 0x10000000>; // 256mb
+	};
+
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&pio 1 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_blue: blue {
+			label = "blue:status";
+			gpios = <&pio 8 GPIO_ACTIVE_LOW>;
+			color = <LED_COLOR_ID_BLUE>;
+			function = LED_FUNCTION_STATUS;
+		};
+
+		led_red: red {
+			label = "red:status";
+			gpios = <&pio 34 GPIO_ACTIVE_LOW>;
+			color = <LED_COLOR_ID_RED>;
+			function = LED_FUNCTION_STATUS;
+		};
+
+		led_green: green {
+			label = "green:status";
+			gpios = <&pio 35 GPIO_ACTIVE_LOW>;
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_STATUS;
+		};
+	};
+};
+
+&eth {
+	status = "okay";
+
+	gmac0: mac@0 {
+		/* LAN */
+		compatible = "mediatek,eth-mac";
+		reg = <0>;
+		phy-mode = "2500base-x";
+		nvmem-cells = <&macaddr_factory_e000 0>;
+		nvmem-cell-names = "mac-address";
+
+		fixed-link {
+			speed = <2500>;
+			full-duplex;
+			pause;
+		};
+	};
+
+	gmac1: mac@1 {
+		/* WAN */
+		compatible = "mediatek,eth-mac";
+		reg = <1>;
+		phy-mode = "gmii";
+		phy-handle = <&int_gbe_phy>;
+		nvmem-cells = <&macaddr_factory_e000 1>;
+		nvmem-cell-names = "mac-address";
+	};
+};
+
+&mdio_bus {
+	switch: switch@1f {
+		compatible = "mediatek,mt7531";
+		reg = <31>;
+		interrupt-controller;
+		#interrupt-cells = <1>;
+		interrupt-parent = <&pio>;
+		interrupts = <38 IRQ_TYPE_LEVEL_HIGH>;
+		reset-gpios = <&pio 5 GPIO_ACTIVE_HIGH>;
+	};
+};
+
+&crypto {
+	status = "okay";
+};
+
+&pio {
+	spi0_flash_pins: spi0-pins {
+		mux {
+			function = "spi";
+			groups = "spi0", "spi0_wp_hold";
+		};
+		conf-pu {
+			pins = "SPI0_CS", "SPI0_HOLD", "SPI0_WP";
+			drive-strength = <MTK_DRIVE_8mA>;
+			bias-pull-up = <MTK_PUPD_SET_R1R0_11>;
+		};
+		conf-pd {
+			pins = "SPI0_CLK", "SPI0_MOSI", "SPI0_MISO";
+			drive-strength = <MTK_DRIVE_8mA>;
+			bias-pull-down = <MTK_PUPD_SET_R1R0_11>;
+		};
+	};
+
+};
+
+&spi0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&spi0_flash_pins>;
+	cs-gpios = <0>, <0>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	spi_nand: spi_nand@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "spi-nand";
+		reg = <1>;
+		spi-max-frequency = <52000000>;
+
+		spi-cal-enable;
+		spi-cal-mode = "read-data";
+		spi-cal-datalen = <7>;
+		spi-cal-data = /bits/ 8 <0x53 0x50 0x49 0x4E 0x41 0x4E 0x44>;
+		spi-cal-addrlen = <5>;
+		spi-cal-addr = /bits/ 32 <0x0 0x0 0x0 0x0 0x0>;
+
+		spi-tx-bus-width = <4>;
+		spi-rx-bus-width = <4>;
+		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 = "BL2";
+				reg = <0x00000 0x0100000>;
+				read-only;
+			};
+
+			partition@100000 {
+				label = "u-boot-env";
+				reg = <0x0100000 0x0080000>;
+				read-only;
+			};
+
+			factory: partition@180000 {
+				label = "Factory";
+				reg = <0x180000 0x0200000>;
+				read-only;
+
+				nvmem-layout {
+					compatible = "fixed-layout";
+					#address-cells = <1>;
+					#size-cells = <1>;
+
+					eeprom_factory_0: eeprom@0 {
+						reg = <0x0 0x1000>;
+					};
+
+					macaddr_factory_e000: macaddr@e000 {
+						compatible = "mac-base";
+						reg = <0xe000 0x6>;
+						#nvmem-cell-cells = <1>;
+					};
+				};
+			};
+
+			partition@380000 {
+				label = "FIP";
+				reg = <0x380000 0x0200000>;
+				read-only;
+			};
+
+			partition@580000 {
+				label = "ubi";
+				reg = <0x580000 0x4000000>;
+				compatible = "linux,ubi";
+			};
+		};
+	};
+};
+
+&switch {
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port@0 {
+			reg = <0>;
+			label = "lan1";
+		};
+
+		port@6 {
+			reg = <6>;
+			label = "cpu";
+			ethernet = <&gmac0>;
+			phy-mode = "2500base-x";
+
+			fixed-link {
+				speed = <2500>;
+				full-duplex;
+				pause;
+			};
+		};
+	};
+};
+
+&uart0 {
+	status = "okay";
+};
+
+&watchdog {
+	status = "okay";
+};
+
+&wifi {
+	status = "okay";
+	nvmem-cells = <&eeprom_factory_0>;
+	nvmem-cell-names = "eeprom";
+};
+
diff --git a/target/linux/mediatek/filogic/base-files/etc/board.d/02_network b/target/linux/mediatek/filogic/base-files/etc/board.d/02_network
index a198fb98c99..a9cf0d2305a 100644
--- a/target/linux/mediatek/filogic/base-files/etc/board.d/02_network
+++ b/target/linux/mediatek/filogic/base-files/etc/board.d/02_network
@@ -40,6 +40,9 @@ mediatek_setup_interfaces()
 	zbtlink,zbt-z8103ax)
 		ucidef_set_interfaces_lan_wan "lan1 lan2 lan3" eth1
 		;;
+	comfast,cf-e393ax)
+		ucidef_set_interfaces_lan_wan "lan1" eth1
+		;;
 	glinet,gl-mt2500|\
 	glinet,gl-mt3000)
 		ucidef_set_interfaces_lan_wan eth1 eth0
diff --git a/target/linux/mediatek/filogic/base-files/etc/hotplug.d/ieee80211/11_fix_wifi_mac b/target/linux/mediatek/filogic/base-files/etc/hotplug.d/ieee80211/11_fix_wifi_mac
index 937d39066c0..1f00e9b2854 100644
--- a/target/linux/mediatek/filogic/base-files/etc/hotplug.d/ieee80211/11_fix_wifi_mac
+++ b/target/linux/mediatek/filogic/base-files/etc/hotplug.d/ieee80211/11_fix_wifi_mac
@@ -57,6 +57,10 @@ case "$board" in
 		esac
 		[ "$PHYNBR" = "1" ] && echo "$addr" > /sys${DEVPATH}/macaddress
 		;;
+	comfast,cf-e393ax)
+		addr=$(mtd_get_mac_binary "Factory" 0x8000)
+		[ "$PHYNBR" = "1" ] && macaddr_add $addr 1 > /sys${DEVPATH}/macaddress
+		;;
 	cudy,wr3000-v1)
 		addr=$(mtd_get_mac_binary bdinfo 0xde00)
 		# Originally, phy0 is phy1 mac with LA bit set. However, this would conflict
diff --git a/target/linux/mediatek/image/filogic.mk b/target/linux/mediatek/image/filogic.mk
index c64a46fe247..90a0e91f02c 100644
--- a/target/linux/mediatek/image/filogic.mk
+++ b/target/linux/mediatek/image/filogic.mk
@@ -322,6 +322,30 @@ define Device/cmcc_rax3000m
 endef
 TARGET_DEVICES += cmcc_rax3000m
 
+define Device/comfast_cf-e393ax
+  DEVICE_VENDOR := Comfast
+  DEVICE_MODEL := CF-E393AX
+  DEVICE_DTS := mt7981a-comfast-cf-e393ax
+  DEVICE_DTS_DIR := ../dts
+  DEVICE_DTC_FLAGS := --pad 4096
+  DEVICE_DTS_LOADADDR := 0x43f00000
+  DEVICE_PACKAGES := kmod-mt7981-firmware mt7981-wo-firmware
+  KERNEL_LOADADDR := 0x44000000
+  KERNEL = kernel-bin | lzma | \
+       fit lzma $$(KDIR)/image-$$(firstword $$(DEVICE_DTS)).dtb
+  KERNEL_INITRAMFS = kernel-bin | lzma | \
+       fit lzma $$(KDIR)/image-$$(firstword $$(DEVICE_DTS)).dtb with-initrd
+  UBINIZE_OPTS := -E 5
+  BLOCKSIZE := 128k
+  PAGESIZE := 2048
+  IMAGE_SIZE := 65536k
+  KERNEL_IN_UBI := 1
+  IMAGES := sysupgrade.bin factory.bin
+  IMAGE/factory.bin := append-ubi | check-size $$$$(IMAGE_SIZE)
+  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
+endef
+TARGET_DEVICES += comfast_cf-e393ax
+
 define Device/confiabits_mt7981
   DEVICE_VENDOR := Confiabits
   DEVICE_MODEL := MT7981