mediatek: add support for ELECOM WRC-X6000GSD

ELECOM WRC-X6000GSD is a 4804Mbps 4xMIMO 2.4/5 GHz 11ax (Wi-Fi 6) router
with 2.5Gbps WAN (stock: 1Gbps max.), based on MT7986B

Specification:

- SoC             : MediaTek MT7986BLA
- RAM             : DDR3 512 MiB (SoC)
- Flash           : Winbond 128MiB SPI NAND (W25N01GVZEIG)
- WLAN            : 2.4/5 GHz 4T4R (MediaTek MT7986)
- Ethernet        : 5x 10/100/1000(/2500) Mbps
  - wan           : Maxlinear Ethernet GPY211C (max. 2500M)
  - lan           : MediaTek MT7531 (max. 1000M)
- LEDs/Keys (GPIO): 11x/4x
- UART            : through-hole on PCB (J1)
  - assignment    : 3.3V, TX, RX, NC, GND from tri-angle marking
  - settings      : 115200n8
- Power           : 12 VDC, 2 A

Flash layout:
dev:  offset     size        name
mtd0: 0x00000000 0x00100000 "BL2"
mtd1: 0x00100000 0x00080000 "Ubootenv"
mtd2: 0x00180000 0x00200000 "Factory"
mtd3: 0x00380000 0x00200000 "FIP"
mtd4: 0x00580000 0x00020000 "Fwheader"
mtd5: 0x005a0000 0x03200000 "ubi"
mtd6: 0x037a0000 0x00380000 "Config"
mtd7: 0x03b20000 0x00020000 "Fwheader_2"
mtd8: 0x03b40000 0x03200000 "ubi_2"
mtd9: 0x06d40000 0x00380000 "Config_2"
mtd10: 0x070c0000 0x00100000 "persist"
mtd11: 0x071c0000 0x00040000 "Mrd"
mtd12: 0x07200000 0x00380000 "Backup"

Flash instruction using factory.bin image:

1. Boot WRC-X6000GSD in router mode normally
2. Access to the WebUI ("http://192.168.2.1/") on the device
   -> その他設定 (Other settings)
   -> フォームウェア更新 (Update firmware)
   -> ローカルファイル指定 (Specify local file)
3. Select the OpenWrt factory.bin image and click apply ("適用") button
4. Wait ~120 seconds to complete flashing

Switching to the stock firmware:

1. Load the elecom.sh script
   . /lib/upgrade/elecom.sh

2. Check the current index of firmware partition
   mstc_rw_bootnum

3. Set the bootnum to opposite value between 1 and 2
   mstc_rw_bootnum value

   example:
   - step2 returned "1": mstc_rw_bootnum 2
   - step2 returned "2": mstc_rw_bootnum 1

4. Reboot, to stock FW

5. Flash the stock FW to fuly revert back to original.

Notes:

- With the stock firmware, it will flash to another partition and
  toggle boot to that partition when any firmware is flashed.
  For example when booting on ubi, the new firmware will be flashed
  to ubi_2 and the router will boot from ubi_2 afterwards.
  The 5th byte of the Persist partition is the boot value (0x01 or 0x02).

- bootmenu_delay=0 is set from factory so uboot menu is hidden by
  default.

- The hardware of WRC-X6000GSD is almost identical to WRC-X6000QS, but
  WAN (labeled as "INTERNET") port is limited to 1000 Mbps on stock FW.
  On OpenWrt FW, 2500 Mbps connection is available on that port.

MAC Addresses:

LAN   : 38:97:A4:xx:xx:58 (Factory, 0x2A(hex)/Ubootenv, "ethaddr"(text))
WAN   : 38:97:A4:xx:xx:5B (Factory, 0x24(hex))
2.4GHz: 38:97:A4:xx:xx:59 (Factory, 0x4(hex))
5GHz  : 38:97:A4:xx:xx:5A (Factory, 0xA(hex)

Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/22926
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/mediatek/dts/mt7986b-elecom-wrc-x6000gsd.dts

@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "mt7986b-elecom-wrc-x6000.dtsi"
+
+/ {
+	model = "ELECOM WRC-X6000GSD";
+	compatible = "elecom,wrc-x6000gsd", "mediatek,mt7986b";
+};

target/linux/mediatek/filogic/base-files/etc/board.d/01_leds

@@ -100,6 +100,7 @@ cudy,wbr3000uax-v1-ubootmod)
 elecom,wrc-x3000gs3)
 	ucidef_set_led_netdev "wan" "wan" "green:wan" "wan"
 	;;
+elecom,wrc-x6000gsd|\
 elecom,wrc-x6000qs)
 	ucidef_set_led_netdev "wan" "wan" "mdio-bus:05:white:wan" "wan" "link tx rx"
 	;;

target/linux/mediatek/filogic/base-files/lib/upgrade/platform.sh

@@ -228,6 +228,7 @@ platform_do_upgrade() {
 		nand_do_upgrade "$1"
 		;;
 	elecom,wrc-x3000gs3|\
+	elecom,wrc-x6000gsd|\
 	elecom,wrc-x6000qs)
 		local bootnum="$(mstc_rw_bootnum)"
 		case "$bootnum" in
@@ -445,6 +446,7 @@ platform_pre_upgrade() {
 	buffalo,wsr-6000ax8)
 		buffalo_initial_setup
 		;;
+	elecom,wrc-x6000gsd|\
 	elecom,wrc-x6000qs)
 		local delay=$(fw_printenv -n bootmenu_delay)
 

target/linux/mediatek/image/filogic.mk

@@ -1578,6 +1578,20 @@ define Device/elecom_wrc-x3000gs3
 endef
 TARGET_DEVICES += elecom_wrc-x3000gs3
 
+define Device/elecom_wrc-x6000gsd
+  DEVICE_VENDOR := ELECOM
+  DEVICE_MODEL := WRC-X6000GSD
+  DEVICE_DTS := mt7986b-elecom-wrc-x6000gsd
+  DEVICE_DTS_DIR := ../dts
+  DEVICE_DTS_LOADADDR := 0x47000000
+  IMAGES += factory.bin
+  IMAGE/factory.bin := sysupgrade-tar | mstc-header 5.04(XZR.0)b90 YTC@ | \
+	elecom-product-header WRC-X6000GS
+  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
+  DEVICE_PACKAGES := kmod-mt7915e kmod-mt7986-firmware mt7986-wo-firmware
+endef
+TARGET_DEVICES += elecom_wrc-x6000gsd
+
 define Device/elecom_wrc-x6000qs
   DEVICE_VENDOR := ELECOM
   DEVICE_MODEL := WRC-X6000QS