ramips: mt7621: Add DNA Valokuitu Plus EX400

Specifications:
- Device: DNA Valokuitu Plus EX400
- SoC: MT7621A
- Flash: 256MB NAND
- RAM: 256MB
- Ethernet: Built-in, 2 x 1GbE
- Wifi: MT7603 2.4 GHz, MT7615 5 GHz (4x internal antennas)
- USB: 1x 3.0
- LED: 1x green/red, 1x green
- Buttons: Reset

MAC addresses:
- LAN:     u-boot 'ethaddr' (label)
- WAN:     label + 1
- 2.4 GHz: label + 6
- 5 GHz:   label + 7

Serial:
 There is a black block connector next to the red ethernet connector. It
 is accessible also through holes in the casing.

Pinout (TTL 3.3V)
 +---+---+
 |Tx |Rx |
 +---+---+
 |Vcc|Gnd|
 +---+---+

Firmware:
 The vendor firmware is a fork of OpenWrt (Reboot) with a kernel version
 4.4.93. The flash is arranged as below and there is a dual boot
 mechanism alternating between rootfs_0 and rootfs_1.

 +-------+------+------+-----------+-----------+
 |       | env1 | env2 | rootfs_0  |  rootfs_1 |
 |       +------+------+-----------+-----------+
 |       |         UBI volumes                 |
 +-------+-------------------------------------+
 |U-Boot |             UBI                     |
 +-------+-------------------------------------+
 |mtd0   |             mtd1                    |
 +-------+-------------------------------------+
 |                     NAND                    |
 +---------------------------------------------+

 In OpenWrt rootfs_0 will be used as a boot partition that will contain the
 kernel and the dtb. The squashfs rootfs and overlay are standard OpenWrt
 behaviour.

 +-------+------+------+-----------+--------+------------+
 |       | env1 | env2 | rootfs_0  | rootfs | rootfs_data|
 |       +------+------+-----------+--------+------------+
 |       |         UBI volumes                           |
 +-------+-----------------------------------------------+
 |U-Boot |             UBI                               |
 +-------+-----------------------------------------------+
 |mtd0   |             mtd1                              |
 +-------+-----------------------------------------------+
 |                     NAND                              |
 +-------------------------------------------------------+

U-boot:
 With proper serial access booting can be halted to U-boot by pressing any
 key. TFTP and flash writes are available, but only the first one has been
 tested.

 NOTE: Recovery mode can be accessed by holding down the reset button while
 powering on the device. The led 'Update' will show a solid green light
 once ready. A web server will be running at 192.168.1.1:80 and it will
 allow flashing a firmware package. You can cycle between rootfs_0 and
 rootfs_1 by pressing the reset button once.

Root password:
 With the vendor web UI create a backup of your settings and download the
 archive to your computer. Within the archive in the file
 /etc/shadow replace the password hash for root with that of a password you
 know. Restore the configuration with the vendor web UI and you will have
 changed the root password.

SSH access:
 You might need to enable the SSH service for LAN interface as by default
 it's enabled for WAN only.

Installing OpenWrt:
 With the vendor web UI install the OpenWrt factory image. Alternatively,
 ssh to the device and use sysupgrade -n from cli.

 Finalize by installing the OpenWrt sysupgrade image to get a fully
 functioning system.

Reverting to the vendor firmware:

 Boot with OpenWrt initramfs image
  - Remove volumes rootfs_0, rootfs and rootfs_data and create vendor
    volumes.

    ubirmvol /dev/ubi0 -n 2
    ubirmvol /dev/ubi0 -n 3
    ubirmvol /dev/ubi0 -n 4
    ubimkvol /dev/ubi0 -N rootfs_0 -S 990
    ubimkvol /dev/ubi0 -N rootfs_1 -S 990

 Power off and enter to the U-boot recovery to install the vendor
 firmware.

Known issues:
 - MACs for wifi are stored in currently unknown place but it seems
   to persist over power-off. They might be stored on the chip.

Signed-off-by: Mauri Sandberg <maukka@ext.kapsi.fi>
[rmilecki: try NVMEM for MACs]
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

7 files changed, 273 insertions, 0 deletions

diff --git a/package/boot/uboot-envtools/files/ramips b/package/boot/uboot-envtools/files/ramips
index cca394a03b..97e9fc2b1c 100644
--- a/package/boot/uboot-envtools/files/ramips
+++ b/package/boot/uboot-envtools/files/ramips
@@ -146,6 +146,10 @@ xiaomi,mi-router-cr6608|\
 xiaomi,mi-router-cr6609)
 	ubootenv_add_uci_config "/dev/mtd1" "0x0" "0x10000" "0x20000"
 	;;
+dna,valokuitu-plus-ex400)
+	ubootenv_add_uci_config "/dev/ubi0_0" "0x0" "0x1f000" "0x1f000" "1"
+	ubootenv_add_uci_config "/dev/ubi0_1" "0x0" "0x1f000" "0x1f000" "1"
+	;;
 netgear,wax214v2)
 	ubootenv_add_uci_config "/dev/mtd1" "0x0" "0x20000" "0x20000"
 	ubootenv_add_uci_sys_config "/dev/mtd1" "0x20000" "0x8000" "0x20000"
diff --git a/target/linux/ramips/dts/mt7621_dna_valokuitu-plus-ex400.dts b/target/linux/ramips/dts/mt7621_dna_valokuitu-plus-ex400.dts
new file mode 100644
index 0000000000..98b2bbf7b6
--- /dev/null
+++ b/target/linux/ramips/dts/mt7621_dna_valokuitu-plus-ex400.dts
@@ -0,0 +1,130 @@
+// 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 = "dna,valokuitu-plus-ex400", "mediatek,mt7621-soc";
+	model = "DNA Valokuitu Plus EX400";
+
+	aliases {
+		ethernet0 = &gmac0;
+		label-mac-device = &gmac0;
+		led-boot = &led_status_red;
+		led-failsafe = &led_status_red;
+		led-running = &led_status_green;
+		led-upgrade = &led_update_green;
+	};
+
+	chosen {
+		bootargs-override = "console=ttyS0,115200 rootfstype=squashfs,jffs2";
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_status_green: led-0 {
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_STATUS;
+			gpios = <&gpio 8 GPIO_ACTIVE_LOW>;
+		};
+
+		led_status_red: led-1 {
+			color = <LED_COLOR_ID_RED>;
+			function = LED_FUNCTION_STATUS;
+			gpios = <&gpio 11 GPIO_ACTIVE_HIGH>;
+		};
+
+		led_update_green: led-2 {
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_PROGRAMMING;
+			gpios = <&gpio 12 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+&nand {
+	status = "okay";
+
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		partition@0 {
+			reg = <0x00 0x100000>;
+			label = "uboot";
+			read-only;
+		};
+
+		partition@100000 {
+			reg = <0x100000 0xff00000>;
+			label = "ubi";
+
+			volumes {
+				ubi-volume-env1 {
+					volname = "env1";
+
+					nvmem-layout {
+						compatible = "u-boot,env";
+
+						ethaddr: ethaddr {
+							#nvmem-cell-cells = <1>;
+						};
+					};
+				};
+			};
+		};
+	};
+};
+
+&gmac1 {
+	label = "wan";
+	phy-handle = <&ethphy0>;
+	nvmem-cells = <&ethaddr 1>;
+	nvmem-cell-names = "mac-address";
+	status = "okay";
+};
+
+&i2c {
+	status = "okay";
+};
+
+&ethphy0 {
+	/delete-property/ interrupts;
+};
+
+&state_default {
+	gpio {
+		groups = "uart2", "uart3";
+		function = "gpio";
+	};
+};
+
+&switch0 {
+	ports {
+		port@1 {
+			label = "lan";
+			nvmem-cells = <&ethaddr 0>;
+			nvmem-cell-names = "mac-address";
+			status = "okay";
+		};
+	};
+};
diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index 18dbbcadf3..bf700674ef 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -36,6 +36,68 @@ define Build/arcadyan-trx
 	rm $@.hsqs $@.tail
 endef
 
+define Build/dna-header
+	BC='$(STAGING_DIR_HOST)/bin/bc' ;\
+	ubifsofs="1024" ;\
+	ubifs="$$(stat -c%s $@)" ;\
+	pkginfoofs="$$(echo $${ubifsofs} + $${ubifs} | $${BC})" ;\
+	pkginfo="0" ;\
+	scrofs="$$(echo $${pkginfoofs} + $${pkginfo} | $${BC})" ;\
+	scr="0" ;\
+	sigofs="$$(echo $${scrofs} + $${scr} | $${BC})" ;\
+	sig="0" ;\
+	md5ofs="$$(echo $${sigofs} + $${sig} | $${BC})" ;\
+	md5="32" ;\
+	size="$$(echo $${md5ofs} + $${md5} | $${BC})" ;\
+	echo "IntenoIopY" > $@.tmp ;\
+	echo "version 5" >> $@.tmp ;\
+	echo "integrity MD5SUM" >> $@.tmp ;\
+	echo "board EX400" >> $@.tmp ;\
+	echo "chip 7621" >> $@.tmp ;\
+	echo "arch all mipsel_1004kc" >> $@.tmp ;\
+	echo "model EX400" >> $@.tmp ;\
+	echo "release EX400-X-DNA-4.3.6.100-R-210518_0935" >> $@.tmp ;\
+	echo "customer DNA" >> $@.tmp ;\
+	echo "ubifsofs $${ubifsofs}" >> $@.tmp ;\
+	echo "ubifs $${ubifs}" >> $@.tmp ;\
+	echo "pkginfoofs $${pkginfoofs}" >> $@.tmp ;\
+	echo "pkginfo $${pkginfo}" >> $@.tmp ;\
+	echo "scrofs $${scrofs}" >> $@.tmp ;\
+	echo "scr $${scr}" >> $@.tmp ;\
+	echo "sigofs $${sigofs}" >> $@.tmp ;\
+	echo "sig $${sig}" >> $@.tmp ;\
+	echo "md5ofs $${md5ofs}" >> $@.tmp ;\
+	echo "md5 $${md5}" >> $@.tmp ;\
+	echo "size $${size}" >> $@.tmp
+
+	dd if=$@.tmp of=$@.tmp2 bs=1024 count=1 conv=sync
+	cat $@.tmp2 $@ > $@.tmp
+	rm $@.tmp2
+	mv $@.tmp $@
+endef
+
+define Build/dna-bootfs
+	mkdir -p $@.ubifs-dir/boot
+
+	# populate the boot fs with the dtb and with either initramfs kernel or
+	# the normal kernel
+	$(CP) $(KDIR)/image-$(firstword $(DEVICE_DTS)).dtb $@.ubifs-dir/boot/dtb
+
+	$(if $(findstring with-initrd,$(word 1,$(1))),\
+		( \
+			$(CP) $@ $@.ubifs-dir/boot/uImage \
+		) , \
+		( \
+			$(CP) $(IMAGE_KERNEL) $@.ubifs-dir/boot/uImage \
+		) \
+	)
+
+	# create ubifs
+	$(STAGING_DIR_HOST)/bin/mkfs.ubifs ${MKUBIFS_OPTS} -r $@.ubifs-dir/ -o $@.new
+	rm -rf $@.ubifs-dir
+	mv $@.new $@
+endef
+
 define Build/gemtek-trailer
 	printf "%s%08X" ".GEMTEK." "$$(cksum $@ | cut -d ' ' -f1)" >> $@
 endef
@@ -103,6 +165,10 @@ define Build/iodata-mstc-header2
 	mv $@.new $@
 endef
 
+define Build/kernel-initramfs-bin
+	$(CP) $(KDIR)/vmlinux-initramfs $@
+endef
+
 define Build/znet-header
 	$(eval version=$(word 1,$(1)))
 	$(eval magic=$(if $(word 2,$(1)),$(word 2,$(1)),ZNET))
@@ -988,6 +1054,27 @@ define Device/d-team_pbr-m1
 endef
 TARGET_DEVICES += d-team_pbr-m1
 
+define Device/dna_valokuitu-plus-ex400
+  $(Device/dsa-migration)
+  IMAGE_SIZE := 117m
+  PAGESIZE := 2048
+  MKUBIFS_OPTS := --min-io-size=$$(PAGESIZE) --leb-size=124KiB --max-leb-cnt=96 \
+  		  --log-lebs=2 --space-fixup --squash-uids
+  DEVICE_VENDOR := DNA
+  DEVICE_MODEL := Valokuitu Plus EX400
+  KERNEL := kernel-bin | lzma | uImage lzma
+  KERNEL_INITRAMFS := kernel-bin | append-dtb | lzma | uImage lzma
+  IMAGES := factory.bin sysupgrade.tar
+  IMAGE/factory.bin := kernel-initramfs-bin | lzma | uImage lzma | \
+                       dna-bootfs with-initrd | dna-header | \
+                       append-md5sum-ascii-salted
+  IMAGE/sysupgrade.tar := dna-bootfs | sysupgrade-tar kernel=$$$$@ | check-size | \
+  			  append-metadata
+  DEVICE_IMG_NAME = $$(DEVICE_IMG_PREFIX)-$$(2)
+  DEVICE_PACKAGES := kmod-mt7603 kmod-mt7615-firmware kmod-usb3
+endef
+TARGET_DEVICES += dna_valokuitu-plus-ex400
+
 define Device/edimax_ra21s
   $(Device/dsa-migration)
   $(Device/uimage-lzma-loader)
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 b7e3a49b43..f251daddd5 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
@@ -67,6 +67,7 @@ ramips_setup_interfaces()
 		ucidef_set_interface_lan "lan"
 		;;
 	asiarf,ap7621-001|\
+	dna,valokuitu-plus-ex400|\
 	humax,e10|\
 	keenetic,kn-3510|\
 	openfi,5pro|\
diff --git a/target/linux/ramips/mt7621/base-files/etc/init.d/bootcount b/target/linux/ramips/mt7621/base-files/etc/init.d/bootcount
index 06846cd4ca..b83223e7dd 100755
--- a/target/linux/ramips/mt7621/base-files/etc/init.d/bootcount
+++ b/target/linux/ramips/mt7621/base-files/etc/init.d/bootcount
@@ -32,6 +32,10 @@ boot() {
 	samknows,whitebox-v8)
 		fw_setenv bootcount 0
 		;;
+	dna,valokuitu-plus-ex400)
+		fw_setenv boot_cnt_primary 0
+		fw_setenv boot_cnt_alt 0
+		;;
 	zyxel,lte3301-plus)
 		[ $(printf %d $(fw_printenv -n DebugFlag)) -gt 0 ] || fw_setenv DebugFlag 1
 		[ $(printf %d $(fw_printenv -n Image1Stable)) -gt 0 ] || fw_setenv Image1Stable 1
diff --git a/target/linux/ramips/mt7621/base-files/lib/upgrade/dna.sh b/target/linux/ramips/mt7621/base-files/lib/upgrade/dna.sh
new file mode 100644
index 0000000000..d699516ff6
--- /dev/null
+++ b/target/linux/ramips/mt7621/base-files/lib/upgrade/dna.sh
@@ -0,0 +1,44 @@
+#
+# Copyright (C) 2023 Mauri Sandberg
+#
+
+# The vendor UBI is split in volumes 0-3. Volumes 0 and 1 contain U-Boot
+# environments env1 and env2, respectively. The vendor root file systems
+# are in volumes 2 (rootfs_0) and 3 (rootfs_1). Drop the two roots and
+# explicitly use rootfs_0 as a boot partition that contains the dtb and the
+# OpenWrt kernel. This is because the vendor U-Boot expects to find them there.
+# Then continue upgrade with the default method - a SquashFS rootfs will be
+# installed and the rest of UBI will be used as an overlay.
+
+# The 'kernel' inside the sysupgrage.tar is an UBIFS image that contains
+# /boot/dtb and /boot/kernel. The 'root' is an OpenWrt SquashFS root
+
+. /lib/functions.sh
+. /lib/upgrade/nand.sh
+
+dna_do_upgrade () {
+	tar -xaf $1
+
+	# get the size of the new bootfs
+	local _bootfs_size=$(wc -c < ./sysupgrade-dna_valokuitu-plus-ex400/kernel)
+	[ -n "$_bootfs_size" -a "$_bootfs_size" -gt "0" ] || nand_do_upgrade_failed
+
+	# remove existing rootfses and recreate rootfs_0
+	ubirmvol /dev/ubi0 --name=rootfs_0 > /dev/null 2>&1
+	ubirmvol /dev/ubi0 --name=rootfs_1 > /dev/null 2>&1
+	ubirmvol /dev/ubi0 --name=rootfs > /dev/null 2>&1
+	ubirmvol /dev/ubi0 --name=rootfs_data > /dev/null 2>&1
+	ubimkvol /dev/ubi0 --type=static --size=${_bootfs_size} --name=rootfs_0
+
+	# update the rootfs_0 contents
+	local _kern_ubivol=$( nand_find_volume "ubi0" "rootfs_0" )
+	ubiupdatevol /dev/${_kern_ubivol} sysupgrade-dna_valokuitu-plus-ex400/kernel
+
+	fw_setenv root_vol rootfs_0
+	fw_setenv boot_cnt_primary 0
+	fw_setenv boot_cnt_alt 0
+
+	# proceed to upgrade the default way
+	CI_KERNPART=none
+	nand_do_upgrade "$1"
+}
diff --git a/target/linux/ramips/mt7621/base-files/lib/upgrade/platform.sh b/target/linux/ramips/mt7621/base-files/lib/upgrade/platform.sh
index bad7e30ca6..f0d41b0914 100755
--- a/target/linux/ramips/mt7621/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ramips/mt7621/base-files/lib/upgrade/platform.sh
@@ -150,6 +150,9 @@ platform_do_upgrade() {
 	buffalo,wsr-2533dhpls)
 		buffalo_do_upgrade "$1"
 		;;
+	dna,valokuitu-plus-ex400)
+		dna_do_upgrade "$1"
+		;;
 	elecom,wrc-x1800gs)
 		[ "$(fw_printenv -n bootmenu_delay)" != "0" ] || \
 			fw_setenv bootmenu_delay 3