ramips: add support for TOZED ZLT S12 PRO

The TOZED ZLT S12 PRO is an AC1200 router featuring 4 Ethernet ports with a
TOZED TL70-C cellular modem which supports the NCM mode.

The stock firmware does SIM locking on the modem by stopping dialing when a
different PLMN is detected. This is not the case on OpenWrt.

Specifications:
- CPU: MediaTek MT7621AT
- RAM: 256MB DDR3
- NOR Flash: MX25L12833FM2I 16MB SPI Flash
- Wi-Fi 2.4Ghz: MT7603E
- Wi-Fi 5Ghz: MT7612E
- Switch: MT7530 4x 1Gbit Ports
- WWAN: Unisoc SL8563 based TOZED TL70-C LTE CAT6 cellular modem
- USB: 1x optional USB2.0 external port
- Switches/Buttons: WPS, Reset, Power Switch
- LEDs: Power, Wi-Fi, Data, Signal 1-5, Phone

Installation and TFTP Recovery:
- Connect to serial console.
- Boot initramfs image by choosing option 1 when U-Boot prompts.
- Install sysupgrade image via OpenWrt.

Serial Pins:
Located at the bottom right when looking from the front, right under the
Reset/WPS buttons. The pinout from the left is:
- RX
- GND
- TX
Baudrate is 115200.

When connecting from a powered off state, disconnect RX as it blocks the
boot process.

Link: http://www.sztozed.com/en/contents/58/84.html
Co-developed-by: Andre Cruz <me@1conan.com>
Signed-off-by: Andre Cruz <me@1conan.com>
Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>

4 files changed, 262 insertions, 0 deletions

diff --git a/target/linux/ramips/dts/mt7621_tozed_zlt-s12-pro.dts b/target/linux/ramips/dts/mt7621_tozed_zlt-s12-pro.dts
new file mode 100644
index 0000000000..5a94bbda82
--- /dev/null
+++ b/target/linux/ramips/dts/mt7621_tozed_zlt-s12-pro.dts
@@ -0,0 +1,245 @@
+// 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 = "tozed,zlt-s12-pro", "mediatek,mt7621-soc";
+	model = "TOZED ZLT S12 PRO";
+
+	aliases {
+		led-boot = &led_power_blue;
+		led-failsafe = &led_power_yellow;
+		led-running = &led_power_blue;
+		led-upgrade = &led_power_blue;
+		label-mac-device = &wifi1;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,115200";
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led-modem-blue {
+			label = "blue:modem";
+			gpios = <&gpio 33 GPIO_ACTIVE_LOW>;
+		};
+
+		led-modem-red {
+			label = "red:modem";
+			gpios = <&gpio 27 GPIO_ACTIVE_LOW>;
+		};
+
+		led_power_blue: led-power-blue {
+			label = "blue:power";
+			gpios = <&gpio 16 GPIO_ACTIVE_LOW>;
+		};
+
+		led_power_yellow: led-power-yellow {
+			label = "yellow:power";
+			gpios = <&gpio 29 GPIO_ACTIVE_LOW>;
+		};
+
+		led-wifi {
+			label = "blue:wifi";
+			gpios = <&gpio 28 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy0tpt";
+		};
+
+		led-signal1 {
+			label = "blue:signal1";
+			gpios = <&gpio 25 GPIO_ACTIVE_LOW>;
+		};
+
+		led-signal2 {
+			label = "blue:signal2";
+			gpios = <&gpio 24 GPIO_ACTIVE_LOW>;
+		};
+
+		led-signal3 {
+			label = "blue:signal3";
+			gpios = <&gpio 23 GPIO_ACTIVE_LOW>;
+		};
+
+		led-signal4 {
+			label = "blue:signal4";
+			gpios = <&gpio 22 GPIO_ACTIVE_LOW>;
+		};
+
+		led-signal5 {
+			label = "blue:signal5";
+			gpios = <&gpio 26 GPIO_ACTIVE_LOW>;
+		};
+
+		led-phone {
+			label = "blue:phone";
+			gpios = <&gpio 31 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		button-reset {
+			label = "reset";
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+
+		button-rfkill {
+			label = "rfkill";
+			gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RFKILL>;
+		};
+
+		button-wps {
+			label = "wps";
+			gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_WPS_BUTTON>;
+		};
+	};
+
+	gpio_export {
+		compatible = "gpio-export";
+
+		lt72_ant0 {
+			gpio-export,name = "lt72_ant0";
+			gpio-export,input = <0>;
+			gpios = <&gpio 6 GPIO_ACTIVE_HIGH>;
+		};
+
+		lt72_ant1 {
+			gpio-export,name = "lt72_ant1";
+			gpio-export,input = <0>;
+			gpios = <&gpio 7 GPIO_ACTIVE_HIGH>;
+		};
+
+		lt72_power {
+			gpio-export,name = "lt72_power";
+			gpio-export,output = <1>;
+			gpios = <&gpio 14 GPIO_ACTIVE_HIGH>;
+		};
+	};
+};
+
+&spi0 {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <10000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "u-boot";
+				reg = <0x0 0x30000>;
+				read-only;
+			};
+
+			partition@30000 {
+				label = "u-boot-env";
+				reg = <0x30000 0x8000>;
+				read-only;
+			};
+
+			// Stock config partition
+			partition@38000 {
+				label = "tozed-conf";
+				reg = <0x38000 0x8000>;
+				read-only;
+			};
+
+			factory: partition@40000 {
+				label = "factory";
+				reg = <0x40000 0x10000>;
+				read-only;
+
+				compatible = "nvmem-cells";
+				#address-cells = <1>;
+				#size-cells = <1>;
+
+				macaddr_factory_e000: macaddr@e000 {
+					reg = <0xe000 0x6>;
+				};
+			};
+
+			partition@50000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x50000 0xfb0000>;
+			};
+		};
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+&pcie0 {
+	wifi0: mt76@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x8000>;
+		ieee80211-freq-limit = <5000000 6000000>;
+	};
+};
+
+&pcie1 {
+	wifi1: mt76@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x0000>;
+		ieee80211-freq-limit = <2400000 2500000>;
+	};
+};
+
+&ethernet {
+	pinctrl-0 = <&mdio_pins>, <&rgmii1_pins>;
+};
+
+&gmac0 {
+	nvmem-cells = <&macaddr_factory_e000>;
+	nvmem-cell-names = "mac-address";
+};
+
+&switch0 {
+	ports {
+		port@0 {
+			status = "okay";
+			label = "wan";
+		};
+
+		port@1 {
+			status = "okay";
+			label = "lan3";
+		};
+
+		port@2 {
+			status = "okay";
+			label = "lan2";
+		};
+
+		port@4 {
+			status = "okay";
+			label = "lan1";
+		};
+	};
+};
+
+&state_default {
+	gpio {
+		groups = "wdt", "rgmii2", "jtag", "uart3";
+		function = "gpio";
+	};
+};
diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index fc532966c8..f717fea5d4 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -2135,6 +2135,16 @@ define Device/totolink_x5000r
 endef
 TARGET_DEVICES += totolink_x5000r
 
+define Device/tozed_zlt-s12-pro
+  $(Device/dsa-migration)
+  $(Device/uimage-lzma-loader)
+  IMAGE_SIZE := 16064k
+  DEVICE_VENDOR := TOZED
+  DEVICE_MODEL := ZLT S12 PRO
+  DEVICE_PACKAGES := kmod-mt7603 kmod-mt76x2 kmod-usb3 comgt-ncm -uboot-envtools
+endef
+TARGET_DEVICES += tozed_zlt-s12-pro
+
 define Device/tplink_archer-ax23-v1
   $(Device/dsa-migration)
   $(Device/tplink-safeloader)
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 5b7cc7f2ca..176d15b730 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
@@ -108,6 +108,10 @@ ramips_setup_interfaces()
 	mikrotik,routerboard-760igs)
 		ucidef_set_interfaces_lan_wan "lan2 lan3 lan4 lan5" "wan sfp"
 		;;
+	tozed,zlt-s12-pro)
+		ucidef_set_interface "wwan" device "/dev/ttyUSB0" protocol "ncm"
+		uci add_list firewall.@zone[1].network='wwan'
+		;;
 	tplink,deco-m4r-v4)
 		ucidef_set_interfaces_lan_wan "eth1" "eth0"
 		;;
diff --git a/target/linux/ramips/mt7621/base-files/etc/board.d/03_gpio_switches b/target/linux/ramips/mt7621/base-files/etc/board.d/03_gpio_switches
index ec2bf695a0..aebb416371 100644
--- a/target/linux/ramips/mt7621/base-files/etc/board.d/03_gpio_switches
+++ b/target/linux/ramips/mt7621/base-files/etc/board.d/03_gpio_switches
@@ -12,6 +12,9 @@ mikrotik,routerboard-760igs)
 telco-electronics,x1)
 	ucidef_add_gpio_switch "modem_reset" "Modem Reset" "496"
 	;;
+tozed,zlt-s12-pro)
+	ucidef_add_gpio_switch "lt72_power" "Power LTE modem" "lt72_power" "1"
+	;;
 tplink,eap235-wall-v1|\
 tplink,eap615-wall-v1)
 	ucidef_add_gpio_switch "poe_passthrough" "PoE Passthrough" "poe-passthrough"