[OpenWrt-Devel] [PATCH] ramips: add support for Xiaomi Mi Wi-Fi Router 3G v2

[Paul Fertser]

- CMIIT ID: 2019AP2581
- SoC:      MediaTek MT7621
- Flash:    16MiB NOR SPI (GigaDevice GD25Q128B)
- RAM:      128MiB DDR3 (ESMT M15T1G1664A)
- Serial:   As marked on PCB, 3V3 logic, baudrate is 115200, 8n1
- Ethernet: 3x 10/100/1000 Mbps (switched, 2xLAN + WAN)
- WIFI0:    MT7603E 2.4GHz 802.11b/g/n
- WIFI1:    MT7612E 5GHz 802.11ac
- Antennas: 4x external (2 per radio), non-detachable
- LEDs:     Programmable "power" LED (two-coloured, yellow/blue)
            Non-programmable "internet" LED (shows WAN activity)
- Buttons:  Reset

INSTALLATION:

Bootloader won't accept any serial input unless "boot_wait" u-boot
environment variable is changed to "on". Vendor firmware (looks like
an illegal OpenWrt fork) won't accept any serial input unless
"uart_en" is set to "1". Tricks to force u-boot to use default
environment do not help as it's restricted in the same way.

With bootloader unlocked the easiest way would be to TFTP the
sysupgrade image or to sysupgrade after loading an initramfs one.

For porting the flash contents were changed externally with an SPI
programmer (after lifting Vcc flash IC pin away from the PCB).

Signed-off-by: Paul Fertser <fercerpav at gmail.com>
---
 .../linux/ramips/base-files/etc/board.d/02_network |   4 +
 target/linux/ramips/dts/mt7621_xiaomi_mir3gv2.dts  | 147 +++++++++++++++++++++
 target/linux/ramips/image/mt7621.mk                |  10 ++
 3 files changed, 161 insertions(+)
 create mode 100644 target/linux/ramips/dts/mt7621_xiaomi_mir3gv2.dts

diff --git a/target/linux/ramips/base-files/etc/board.d/02_network b/target/linux/ramips/base-files/etc/board.d/02_network
index ca111c9d4c..7280da50fc 100755
--- a/target/linux/ramips/base-files/etc/board.d/02_network
+++ b/target/linux/ramips/base-files/etc/board.d/02_network
@@ -464,6 +464,10 @@ ramips_setup_interfaces()
 		ucidef_add_switch "switch0" \
 			"2:lan:2" "3:lan:1" "1:wan" "6t at eth0"
 		;;
+	xiaomi,mir3gv2)
+		ucidef_add_switch "switch0" \
+			"2:lan:2" "3:lan:1" "4:wan" "6t at eth0"
+		;;
 	xiaomi,mir3p)
 		ucidef_add_switch "switch0" \
 			"1:lan:3" "2:lan:2" "3:lan:1" "4:wan" "6 at eth0"
diff --git a/target/linux/ramips/dts/mt7621_xiaomi_mir3gv2.dts b/target/linux/ramips/dts/mt7621_xiaomi_mir3gv2.dts
new file mode 100644
index 0000000000..81f6d20ae8
--- /dev/null
+++ b/target/linux/ramips/dts/mt7621_xiaomi_mir3gv2.dts
@@ -0,0 +1,147 @@
+/dts-v1/;
+
+#include "mt7621.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "xiaomi,mir3gv2", "mediatek,mt7621-soc";
+	model = "Xiaomi Mi Router 3G v2";
+
+	aliases {
+		led-boot = &led_status_yellow;
+		led-failsafe = &led_status_yellow;
+		led-running = &led_status_blue;
+		led-upgrade = &led_status_yellow;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,115200n8";
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_status_blue: status_blue {
+			label = "mir3gv2:blue:status";
+			gpios = <&gpio0 8 GPIO_ACTIVE_LOW>;
+		};
+
+		led_status_yellow: status_yellow {
+			label = "mir3gv2:yellow:status";
+			gpios = <&gpio0 10 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	button {
+		compatible = "gpio-keys-polled";
+		poll-interval = <20>;
+
+		reset {
+			label = "reset";
+			gpios = <&gpio0 18 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+};
+
+&spi0 {
+	status = "okay";
+
+	m25p80 at 0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <80000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition at 0 {
+				label = "u-boot";
+				reg = <0x0 0x30000>;
+				read-only;
+			};
+
+			partition at 30000 {
+				label = "u-boot-env";
+				reg = <0x30000 0x10000>;
+				read-only;
+			};
+
+			partition at 40000 {
+				label = "Bdata";
+				reg = <0x40000 0x10000>;
+				read-only;
+			};
+
+			factory: partition at 50000 {
+				label = "factory";
+				reg = <0x50000 0x10000>;
+				read-only;
+			};
+
+			partition at 60000 {
+				label = "crash";
+				reg = <0x60000 0x10000>;
+				read-only;
+			};
+
+			partition at 70000 {
+				label = "cfg_bak";
+				reg = <0x70000 0x10000>;
+				read-only;
+			};
+
+			partition at 80000 {
+				label = "overlay";
+				reg = <0x80000 0x100000>;
+				read-only;
+			};
+
+			firmware: partition at 180000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x180000 0xe80000>;
+			};
+		};
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+&pcie0 {
+	wifi at 0,0 {
+		compatible = "pci14c3,7662";
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x8000>;
+		ieee80211-freq-limit = <5000000 6000000>;
+	};
+};
+
+&pcie1 {
+	wifi at 0,0 {
+		compatible = "pci14c3,7603";
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x0000>;
+		ieee80211-freq-limit = <2400000 2500000>;
+	};
+};
+
+&ethernet {
+	mtd-mac-address = <&factory 0xe000>;
+	mediatek,portmap = "lllwl";
+};
+
+&pinctrl {
+	state_default: pinctrl0 {
+		gpio {
+			ralink,group = "jtag", "uart2", "uart3", "wdt";
+			ralink,function = "gpio";
+		};
+	};
+};
diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index d32feb7eab..a0c37f0bfe 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -656,6 +656,16 @@ define Device/xiaomi_mir3g
 endef
 TARGET_DEVICES += xiaomi_mir3g
 
+define Device/xiaomi_mir3gv2
+  MTK_SOC := mt7621
+  IMAGE_SIZE := 14848k
+  DEVICE_VENDOR := Xiaomi
+  DEVICE_MODEL := Mi router 3G v2
+  DEVICE_PACKAGES := kmod-mt7603 kmod-mt76x2 wpad-basic
+  SUPPORTED_DEVICES += mir3gv2
+endef
+TARGET_DEVICES += xiaomi_mir3gv2
+
 define Device/xiaomi_mir3p
   MTK_SOC := mt7621
   BLOCKSIZE := 128k
-- 
2.11.0


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