bmips: Add Inteno XG6846 target

This adds a device tree and build options for the XG6846
switch/router to the BMIPS target.

Hardware:
 - SoC: Broadcom BCM6328
 - CPU: BMIPS4350 V7.5
 - RAM: 64 MB DDR
 - NOR Flash: 16 MB parallel (CFE and OS)
 - Ethernet LAN: 4x 1Gbit
 - Ethernet WAN: 2x 1Gbit, fiber and TP
 - Buttons: reset
 - LEDs: 7 or 8, power and USB LEDs are GPIO-based, the
   LAN LEDs are controlled by the Marvell DSA Switch.
 - USB: on some versions
 - UART: yes

The device ODM (original device manufacturer) is XAVi
http://www.xavi.com.tw/

It is possible to boot the initramfs version
openwrt-bmips-bcm6328-inteno_xg6846-initramfs.elf from
CFE by interrupting the boot on the UART console and downloading
it from a TFTP server e.g.:
CFE> r 192.168.1.2:openwrt-bmips-bcm6328-inteno_xg6846-initramfs.elf

Installation to target flash is not possible using CFE because
the image becomes too big for the CFE version found in these
devices. A separate U-Boot two-stage solution exists for
actually booting the device.

This device is called a "managed ethernet switch" by the vendor
and "media converter" or "fiber modem" by some of the ISPs
using it: the main purpose is to convert fiber connections to
ethernet, most devices just act as switches bridging the
fiber SFP to ethernet TP.

The device has a Marvell MV88E6352 DSA switch managed by
a BCM6328 BMIPS SoC.

This port makes it possible to use the XG6846 to grab an IP
number from the fiber connection and use all four LAN
connections out, turning it into a proper router.

This support is based mostly on the observations by the people on
the forum thread "Help with Inteno XG6846" where users NPeca75,
mrhaav, systemcrash and csom helped out to reverse engineer the
device. Then I made it work on the BMIPS target, figured out
the two-level switch hierarchy and settings.

Link: https://forum.openwrt.org/t/help-with-inteno-xg6846/68276/14
Signed-off-by: Paul Donald <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>

target/linux/bmips/bcm6328/base-files/etc/board.d/02_network

@@ -9,6 +9,9 @@ arcadyan,ar7516)
 	ucidef_set_bridge_device switch
 	ucidef_set_interfaces_lan_wan "lan1 lan2 lan3" "wan"
 	;;
+inteno,xg6846)
+	ucidef_set_interfaces_lan_wan "lan1 lan2 lan3 lan4" "wan ext1"
+	;;
 comtrend,ar-5381u |\
 comtrend,ar-5387un |\
 innacomm,w3400v6 |\

target/linux/bmips/dts/bcm6328-inteno-xg6846.dts

@@ -0,0 +1,312 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+/*
+ * Devicetree for the Inteno XG6846 router, mostly used as a
+ * media converter from fiber to twisted pair ethernet
+ * "fiber modem" in many households in Sweden. The Marvell
+ * switch has one of its ports connected to an SFP (Small Form
+ * Factor pluggable) optical fiber receiver, which is bridged
+ * to the twisted pair connector LAN1.
+ *
+ * This device tree is inspired by research from the OpenWrt
+ * and Sweclockers forums, including contributions from
+ * NPeca75, mrhaav and csom.
+ *
+ * Some devices have a USB type A host receptacle mounted,
+ * some do not.
+ */
+#include "bcm6328.dtsi"
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/gpio/gpio.h>
+
+/ {
+	model = "Inteno XG6846";
+	compatible = "inteno,xg6846", "brcm,bcm6328";
+
+	/* OpenWrt-specific aliases */
+	aliases {
+		led-boot = &led_pwr_red;
+		led-failsafe = &led_pwr_red;
+		led-running = &led_pwr_green;
+		led-upgrade = &led_pwr_red;
+		led-usb = &led_usb_green;
+	};
+
+	chosen {
+		bootargs = "rootfstype=squashfs,jffs2 noinitrd console=ttyS0,115200";
+		stdout-path = "serial0:115200n8";
+	};
+
+	/*
+	 * This I2C port is connected to the SFP and reflects the EEPROM etc
+	 * inside the SFP module. If the module is not plugged in, consequently
+	 * nothing will be found on the bus.
+	 */
+	i2c0: i2c-sfp {
+		compatible = "i2c-gpio";
+		sda-gpios = <&gpio 1 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+		scl-gpios = <&gpio 19 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+	};
+
+	/* This I2C bus is used for the external CATV connector (usually unused) */
+	i2c1: i2c-catv {
+		compatible = "i2c-gpio";
+		sda-gpios = <&gpio 23 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+		scl-gpios = <&gpio 7 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+	};
+
+	sfp0: sfp0 {
+		compatible = "sff,sfp";
+		i2c-bus = <&i2c0>;
+		los-gpios = <&gpio 29 GPIO_ACTIVE_HIGH>;
+	};
+
+	keys {
+		compatible = "gpio-keys-polled";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		poll-interval = <20>;
+
+		reset {
+			label = "reset";
+			gpios = <&gpio 24 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+			debounce-interval = <60>;
+		};
+	};
+};
+
+&hsspi {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		/*
+		 * HW 1.0-1.1: Spansion S25FL128S1
+		 * HW 1.3: Winbond W25Q128
+		 *
+		 * Fast Read Data max speed is 50MHz, see the Winbond W25Q128
+		 * datasheet table 9.5 "AC Electrical Characteristics", we can
+		 * use this speed because the chip supports fast reads. Older
+		 * HW has different NOR chips, I assume they can all do fast
+		 * reads.
+		 */
+		spi-max-frequency = <104000000>;
+		spi-tx-bus-width = <2>;
+		spi-rx-bus-width = <2>;
+		m25p,fast-read;
+		reg = <0>;
+
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			cfe: partition@0 {
+				label = "cfe";
+				reg = <0x0000000 0x0010000>;
+				read-only;
+			};
+
+			partition@10000 {
+				compatible = "brcm,bcm963xx-imagetag";
+				reg = <0x010000 0xfe0000>;
+				label = "firmware";
+			};
+
+			partition@ff0000 {
+				reg = <0xff0000 0x010000>;
+				label = "nvram";
+			};
+		};
+	};
+};
+
+&cfe {
+	compatible = "nvmem-cells";
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	macaddr_cfe_6a0: macaddr@6a0 {
+		reg = <0x6a0 0x6>;
+	};
+};
+
+&ethernet {
+	status = "okay";
+
+	nvmem-cells = <&macaddr_cfe_6a0>;
+	nvmem-cell-names = "mac-address";
+};
+
+&switch0 {
+	dsa,member = <0 0>;
+
+	ports {
+		switch0port4: port@4 {
+			reg = <4>;
+			label = "extsw";
+
+			phy-mode = "rgmii";
+			fixed-link {
+				speed = <1000>;
+				full-duplex;
+			};
+		};
+	};
+};
+
+&mdio_ext {
+	switch1: switch@0 {
+		/* The switch is not using any external IRQ, sadly */
+		compatible = "marvell,mv88e6085";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		reg = <0>;
+		interrupt-controller;
+		#interrupt-cells = <2>;
+		dsa,member = <1 0>;
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+				label = "lan1";
+				phy-handle = <&lan1phy>;
+			};
+
+			port@1 {
+				reg = <1>;
+				label = "lan2";
+				phy-handle = <&lan2phy>;
+			};
+
+			port@2 {
+				reg = <2>;
+				label = "lan3";
+				phy-handle = <&lan3phy>;
+			};
+
+			port@3 {
+				reg = <3>;
+				label = "lan4";
+				phy-handle = <&lan4phy>;
+			};
+
+			port@4 {
+				reg = <4>;
+				label = "ext1";
+				phy-handle = <&ext1phy>;
+			};
+
+			port@5 {
+				reg = <5>;
+				phy-mode = "rgmii-id";
+				label = "wan";
+				sfp = <&sfp0>;
+				fixed-link {
+					speed = <1000>;
+					full-duplex;
+				};
+			};
+
+			port@6 {
+				reg = <6>;
+				phy-mode = "rgmii-id";
+				label = "cpu";
+				ethernet = <&switch0port4>;
+				fixed-link {
+					speed = <1000>;
+					full-duplex;
+				};
+			};
+		};
+
+		mdio {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			lan1phy: ethernet-phy@0 {
+				reg = <0>;
+				interrupt-parent = <&switch1>;
+				interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
+			};
+			lan2phy: ethernet-phy@1 {
+				reg = <1>;
+				interrupt-parent = <&switch1>;
+				interrupts = <1 IRQ_TYPE_LEVEL_HIGH>;
+			};
+			lan3phy: ethernet-phy@2 {
+				reg = <2>;
+				interrupt-parent = <&switch1>;
+				interrupts = <2 IRQ_TYPE_LEVEL_HIGH>;
+			};
+			lan4phy: ethernet-phy@3 {
+				reg = <3>;
+				interrupt-parent = <&switch1>;
+				interrupts = <3 IRQ_TYPE_LEVEL_HIGH>;
+			};
+			ext1phy: ethernet-phy@4 {
+				reg = <4>;
+				interrupt-parent = <&switch1>;
+				interrupts = <4 IRQ_TYPE_LEVEL_HIGH>;
+			};
+		};
+	};
+};
+
+&uart0 {
+	status = "okay";
+};
+
+&pinctrl {
+	pinctrl_xg6846_usb_spd_led: xg6846_usb_spd_led-pins {
+		function = "led";
+		pins = "gpio17";
+	};
+};
+
+&leds {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_xg6846_usb_spd_led>, /* GPIO16 LED USB */
+		    <&pinctrl_ephy1_spd_led>, /* GPIO18 LED PWR red */
+		    <&pinctrl_ephy3_spd_led>; /* GPIO20 LED PWR green */
+
+	/* On board variants without USB this LED is not mounted */
+	led_usb_green: led@16 {
+		reg = <16>;
+		active-low;
+		label = "green:usb";
+		default-state = "off";
+	};
+
+	/*
+	 * LED 18 and 20 drive the same physical LED, the PWR
+	 * LED that can be both red and green.
+	 */
+	led_pwr_red: led@18 {
+		reg = <18>;
+		active-low;
+		label = "red:pwr";
+		default-state = "off";
+	};
+
+	led_pwr_green: led@20 {
+		reg = <20>;
+		active-low;
+		label = "green:pwr";
+		default-state = "off";
+	};
+
+};

target/linux/bmips/image/bcm6328.mk

@@ -51,6 +51,20 @@ define Device/innacomm_w3400v6
 endef
 TARGET_DEVICES += innacomm_w3400v6
 
+define Device/inteno_xg6846
+  $(Device/bcm63xx-cfe-legacy)
+  DEVICE_VENDOR := Inteno
+  DEVICE_MODEL := XG6846
+  CHIP_ID := 6328
+  CFE_BOARD_ID := 96328avng
+  FLASH_MB := 16
+  DEVICE_PACKAGES := $(USB2_PACKAGES) \
+    kmod-i2c-core kmod-i2c-gpio \
+    kmod-leds-bcm6328 kmod-dsa-mv88e6xxx \
+    kmod-sfp
+endef
+TARGET_DEVICES += inteno_xg6846
+
 define Device/nucom_r5010unv2
   $(Device/bcm63xx-cfe)
   DEVICE_VENDOR := NuCom