qualcommax: ipq50xx: add support for ELECOM WRC-X3000GST2

qualcommax: ipq50xx: add support for ELECOM WRC-X3000GST2

ELECOM WRC-X3000GST2 is a 2.4/5 GHz band 11ax (Wi-Fi 6) router based on
IPQ5018. The only hardware difference from the WRC-X3000GS2 is the RAM
capacity; all other peripherals are identical. This port therefore
reuses the GS2 board-2.bin (ipq-wifi-elecom_wrc-x3000gs2) and ath11k
calibration variant.

Specification:

- SoC             : Qualcomm IPQ5018
- RAM             : DDR3 512 MiB (Kingston Technology D2516ECMDXGJD)
- Flash           : SPI-NAND 128 MiB (Macronix MX35UF1G24AD-Z4I)
- WLAN            : 2.4/5 GHz 2T2R
  - 2.4 GHz       : Qualcomm IPQ5018 (SoC)
  - 5 GHz         : Qualcomm QCN6122
- Ethernet        : 5x 10/100/1000 Mbps
  - wan (phy)     : Qualcomm IPQ5018 (SoC)
  - lan (switch)  : Qualcomm Atheros QCA8337
- LEDs/Keys (GPIO): 8x / 3x (reset, WPS, router/AP slide switch)
- UART            : through-hole on PCB, 4pins near the barcode
  - assignment    : 3.3V, TX, RX, NC, GND from the barcode side
  - settings      : 115200n8
- Power           : 12 VDC, 1 A (Max. 11.5W)

Flash instruction using factory.bin image:

1. Boot WRC-X3000GST2 normally in router mode
2. Access the WebUI ("http://192.168.2.1/") and open the firmware
   update page ("ファームウェア更新")
3. Select the OpenWrt factory.bin image and click apply ("適用")
4. After the device reboots automatically, wait until the green power LED
   stops blinking and stays solid
5. When the green power LED is solid, hold the reset button until the red
   LED starts blinking to clear remaining stock firmware settings

Switching to the stock firmware:

1. Load the elecom.sh script

   . /lib/upgrade/elecom.sh

2. Check the current index of rootfs

   bootconfig_rw_index 0:bootconfig rootfs

3. Set the index to inverted value

   bootconfig_rw_index 0:bootconfig rootfs <value>
   bootconfig_rw_index 0:bootconfig1 rootfs <value>

   example:

   - step2 returned "0":

     bootconfig_rw_index 0:bootconfig rootfs 1
     bootconfig_rw_index 0:bootconfig1 rootfs 1

   - step2 returned "1":

     bootconfig_rw_index 0:bootconfig rootfs 0
     bootconfig_rw_index 0:bootconfig1 rootfs 0

4. Reboot

Partition Layout (Stock FW):

0x000000000000-0x000000080000 : "0:SBL1"
0x000000080000-0x000000100000 : "0:MIBIB"
0x000000100000-0x000000140000 : "0:BOOTCONFIG"
0x000000140000-0x000000180000 : "0:BOOTCONFIG1"
0x000000180000-0x000000280000 : "0:QSEE"
0x000000280000-0x000000380000 : "0:QSEE_1"
0x000000380000-0x0000003c0000 : "0:DEVCFG"
0x0000003c0000-0x000000400000 : "0:DEVCFG_1"
0x000000400000-0x000000440000 : "0:CDT"
0x000000440000-0x000000480000 : "0:CDT_1"
0x000000480000-0x000000500000 : "0:APPSBLENV"
0x000000500000-0x000000640000 : "0:APPSBL"
0x000000640000-0x000000780000 : "0:APPSBL_1"
0x000000780000-0x000000880000 : "0:ART"
0x000000880000-0x000000900000 : "0:TRAINING"
0x000000900000-0x000003c40000 : "rootfs"
0x000003c40000-0x000003fc0000 : "Config"
0x000003fc0000-0x000007300000 : "rootfs_1"
0x000007300000-0x000007680000 : "Config_2"
0x000007680000-0x000007b80000 : "Reserved"
0x000007b80000-0x000007c00000 : "FWHEADER"
0x000007c00000-0x000007c80000 : "Factory"

Notes:

- This device has dual-boot feature and it's managed by the index in the
  0:bootconfig and 0:bootconfig1 partitions.

- Wi-Fi BDF is shared with WRC-X3000GS2 (ipq-wifi-elecom_wrc-x3000gs2)
  as the hardware (SoC, QCN6122, antennas) is identical between the two
  models.

- GST2 stock firmware keeps its configuration even when sysupgrade is
  called with -n. When installing from the OEM WebUI, those stock
  settings can be restored into OpenWrt overlay, so settings must be
  initialized after the first OpenWrt boot.

MAC Addresses:

LAN    : 38:97:A4:xx:xx:40 (0:APPSBLENV, "eth1addr"/"ethaddr"  (text))
WAN    : 38:97:A4:xx:xx:43 (0:APPSBLENV, "eth0addr" (text))
2.4 GHz: 38:97:A4:xx:xx:41 (0:APPSBLENV, "wifi0"    (text))
5 GHz  : 38:97:A4:xx:xx:42 (0:APPSBLENV, "wifi1"    (text))

Signed-off-by: Taiga Ogawa <zectaiga@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/23471
Signed-off-by: Robert Marko <robimarko@gmail.com>