mediatek: add support for Confiabits MT7981

Confiabits MT7981 is a Wi-Fi 6 router based on MediaTek MT7981.

Specification:
 - SoC: MediaTek MT7981B
 - CPU: 2x 1.3 GHz Cortex-A53
 - Flash: 128 MiB SPI NAND
 - RAM: 256 MiB
 - WLAN: 2.4 GHz, 5 GHz (MediaTek MT7976CN, 802.11ax)
 - Ethernet: 4x 10/100/1000 Mbps MT7531AE (3xLAN, 1xWAN)
 - USB 2.0 port
 - Buttons: 1 Reset button, 1 Mesh button.
 - LEDs: 7x light-blue, 2x warm-white
 - Serial console: internal 4-pin header, 115200 8n1
 - Power: 12 VDC, 1.5 A

MAC addresses in stock firmware and in this commit:
+---------+-------------------+-----------+
|         | MAC               | Algorithm |
+---------+-------------------+-----------+
| WAN     | 00:0c:43:xx:xx:e1 | label+1   |
| LAN     | 00:0c:43:xx:xx:e0 | label     |
| WLAN 2g | 00:0c:43:xx:xx:e0 | label     |
| WLAN 5g | 02:0c:43:xx:xx:e0 |           |
+---------+-------------------+-----------+
The label MAC was found in 'Factory', 0x4

Installation:
The stock firmware is OpenWrt-based. If you can reach LuCI or SSH, just use the sysupgrade image
with the 'Keep settings' option turned off.

Signed-off-by: Luis Mita <luis@luismita.com>

4 files changed, 319 insertions, 0 deletions

diff --git a/target/linux/mediatek/dts/mt7981b-confiabits-mt7981.dts b/target/linux/mediatek/dts/mt7981b-confiabits-mt7981.dts
new file mode 100644
index 0000000000..2824bbfc84
--- /dev/null
+++ b/target/linux/mediatek/dts/mt7981b-confiabits-mt7981.dts
@@ -0,0 +1,296 @@
+/dts-v1/;
+
+#include "mt7981.dtsi"
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/leds/common.h>
+
+/ {
+	model = "Confiabits MT7981";
+	compatible = "confiabits,mt7981", "mediatek,mt7981";
+
+	aliases {
+		led-boot = &led_power;
+		led-failsafe = &led_power;
+		led-running = &led_power;
+		led-upgrade = &led_power;
+		serial0 = &uart0;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		button-mesh {
+			label = "mesh";
+			linux,input-type = <EV_SW>;
+			linux,code = <BTN_0>;
+			gpios = <&pio 0 GPIO_ACTIVE_HIGH>;
+			debounce-interval = <60>;
+		};
+
+		button-reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&pio 1 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led-wlan5g {
+			color = <LED_COLOR_ID_RED>;
+			function = LED_FUNCTION_WLAN;
+			function-enumerator = <5>;
+			gpios = <&pio 5 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy1tpt";
+		};
+
+		led-wan-red {
+			color = <LED_COLOR_ID_RED>;
+			function = LED_FUNCTION_WAN;
+			gpios = <&pio 6 GPIO_ACTIVE_LOW>;
+		};
+
+		led_power: led-power {
+			label = "blue:power"; // can be removed once #13837 is merged
+			color = <LED_COLOR_ID_BLUE>;
+			function = LED_FUNCTION_POWER;
+			gpios = <&pio 7 GPIO_ACTIVE_LOW>;
+		};
+
+		led-lan1 {
+			color = <LED_COLOR_ID_BLUE>;
+			function = LED_FUNCTION_LAN;
+			function-enumerator = <1>;
+			gpios = <&pio 9 GPIO_ACTIVE_LOW>;
+		};
+
+		led-lan2 {
+			color = <LED_COLOR_ID_BLUE>;
+			function = LED_FUNCTION_LAN;
+			function-enumerator = <2>;
+			gpios = <&pio 10 GPIO_ACTIVE_LOW>;
+		};
+
+		led-lan3 {
+			color = <LED_COLOR_ID_BLUE>;
+			function = LED_FUNCTION_LAN;
+			function-enumerator = <3>;
+			gpios = <&pio 11 GPIO_ACTIVE_LOW>;
+		};
+
+		led-wan-blue {
+			color = <LED_COLOR_ID_BLUE>;
+			function = LED_FUNCTION_WAN;
+			gpios = <&pio 12 GPIO_ACTIVE_LOW>;
+		};
+
+		led-wlan2g {
+			color = <LED_COLOR_ID_RED>;
+			function = LED_FUNCTION_WLAN;
+			function-enumerator = <2>;
+			gpios = <&pio 34 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy0tpt";
+		};
+
+		led-mesh {
+			color = <LED_COLOR_ID_BLUE>;
+			function = "mesh"; // no LED_FUNCTION_MESH yet
+			gpios = <&pio 35 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&uart0 {
+	status = "okay";
+};
+
+&watchdog {
+	status = "okay";
+};
+
+&eth {
+	pinctrl-names = "default";
+	pinctrl-0 = <&mdio_pins>;
+
+	status = "okay";
+
+	gmac0: mac@0 {
+		compatible = "mediatek,eth-mac";
+		reg = <0>;
+		phy-mode = "2500base-x";
+
+		nvmem-cell-names = "mac-address";
+		nvmem-cells = <&macaddr_factory_4 0>;
+
+		fixed-link {
+			speed = <2500>;
+			full-duplex;
+			pause;
+		};
+	};
+};
+
+
+&mdio_bus {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	switch: switch@1f {
+		compatible = "mediatek,mt7531";
+		reg = <31>;
+		reset-gpios = <&pio 39 GPIO_ACTIVE_HIGH>;
+	};
+};
+
+&switch {
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port@0 {
+			reg = <0>;
+			label = "lan1";
+		};
+
+		port@2 {
+			reg = <2>;
+			label = "lan2";
+		};
+
+		port@3 {
+			reg = <3>;
+			label = "lan3";
+		};
+
+		port@4 {
+			reg = <4>;
+			label = "wan";
+
+			nvmem-cell-names = "mac-address";
+			nvmem-cells = <&macaddr_factory_4 1>;
+		};
+
+		port@6 {
+			reg = <6>;
+			label = "cpu";
+			ethernet = <&gmac0>;
+			phy-mode = "2500base-x";
+
+			fixed-link {
+				speed = <2500>;
+				full-duplex;
+				pause;
+			};
+		};
+	};
+};
+
+&spi0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&spi0_flash_pins>;
+	status = "okay";
+
+	spi_nand: flash@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "spi-nand";
+		reg = <0>;
+		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-buswidth = <4>;
+		spi-rx-buswidth = <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_4: macaddr@4 {
+						compatible = "mac-base";
+						reg = <0x4 0x6>;
+						#nvmem-cell-cells = <1>;
+					};
+				};
+			};
+
+			partition@380000 {
+				label = "FIP";
+				reg = <0x380000 0x0200000>;
+				read-only;
+			};
+
+			partition@580000 {
+				label = "ubi";
+				reg = <0x580000 0x4000000>;
+				compatible = "linux,ubi";
+			};
+		};
+	};
+};
+
+&pio {
+	spi0_flash_pins: spi0-pins {
+		mux {
+			function = "spi";
+			groups = "spi0", "spi0_wp_hold";
+		};
+	};
+
+};
+
+&usb_phy {
+	status = "okay";
+};
+
+&xhci {
+	status = "okay";
+	mediatek,u3p-dis-msk = <0x1>;
+};
+
+&wifi {
+	status = "okay";
+	nvmem-cells = <&eeprom_factory_0>;
+	nvmem-cell-names = "eeprom";
+};
diff --git a/target/linux/mediatek/filogic/base-files/etc/board.d/01_leds b/target/linux/mediatek/filogic/base-files/etc/board.d/01_leds
index 84a8cfbc0b..b1411d56d3 100644
--- a/target/linux/mediatek/filogic/base-files/etc/board.d/01_leds
+++ b/target/linux/mediatek/filogic/base-files/etc/board.d/01_leds
@@ -6,6 +6,12 @@ board=$(board_name)
 board_config_update
 
 case $board in
+confiabits,mt7981)
+	ucidef_set_led_netdev "lan1" "lan1" "blue:lan-1" "lan1" "link tx rx"
+	ucidef_set_led_netdev "lan2" "lan2" "blue:lan-2" "lan2" "link tx rx"
+	ucidef_set_led_netdev "lan3" "lan3" "blue:lan-3" "lan3" "link tx rx"
+	ucidef_set_led_netdev "wan" "wan" "blue:wan" "wan" "link tx rx"
+	;;
 cudy,wr3000-v1)
 	ucidef_set_led_netdev "wan" "wan" "blue:wan" "wan"
 	;;
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 0675e87853..275a322a65 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
@@ -23,6 +23,7 @@ mediatek_setup_interfaces()
 		ucidef_set_interfaces_lan_wan "lan1 lan2 lan3 lan4 sfp2" "eth1 wan"
 		;;
 	cetron,ct3003|\
+	confiabits,mt7981|\
 	cudy,wr3000-v1|\
 	jcg,q30-pro|\
 	qihoo,360t7)
diff --git a/target/linux/mediatek/image/filogic.mk b/target/linux/mediatek/image/filogic.mk
index 7c452ecb1e..195fcb5d2c 100644
--- a/target/linux/mediatek/image/filogic.mk
+++ b/target/linux/mediatek/image/filogic.mk
@@ -255,6 +255,22 @@ define Device/cmcc_rax3000m
 endef
 TARGET_DEVICES += cmcc_rax3000m
 
+define Device/confiabits_mt7981
+  DEVICE_VENDOR := Confiabits
+  DEVICE_MODEL := MT7981
+  DEVICE_DTS := mt7981b-confiabits-mt7981
+  DEVICE_DTS_DIR := ../dts
+  SUPPORTED_DEVICES += mediatek,mt7981-spim-snand-2500wan-gmac2-rfb
+  UBINIZE_OPTS := -E 5
+  BLOCKSIZE := 128k
+  PAGESIZE := 2048
+  IMAGE_SIZE := 65536k
+  KERNEL_IN_UBI := 1
+  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
+  DEVICE_PACKAGES := kmod-usb3 kmod-mt7981-firmware
+endef
+TARGET_DEVICES += confiabits_mt7981
+
 define Device/cudy_wr3000-v1
   DEVICE_VENDOR := Cudy
   DEVICE_MODEL := WR3000