ath79: add support for Dongwon T&I DW02-412H

Dongwon T&I DW02-412H is a 2.4/5GHz band 11ac (WiFi-5) router, based on
Qualcomm Atheros QCA9557.

Specifications
--------------

- SoC: Qualcomm Atheros QCA9557-AT4A
- RAM: DDR2 128MB
- Flash: SPI NOR 2MB (Winbond W25Q16DVSSIG / ESMT F25L16PA(2S)) +
         NAND 64/128MB
- WiFi:
  - 2.4GHz: QCA9557 WMAC
  - 5GHz: QCA9882-BR4A
- Ethernet: 5x 10/100/1000Mbps
  - Switch: QCA8337N-AL3C
- USB: 1x USB 2.0
- UART:
  - JP2: 3.3V, TX, RX, GND (3.3V is the square pad) / 115200 8N1

Installation
--------------

1.  Connect a serial interface to UART header and
    interrupt the autostart of kernel.
2.  Transfer the factory image via TFTP and write it to the NAND flash.
3.  Update U-Boot environment variable.
    > tftpboot 0x81000000 <your image>-factory.img
    > nand erase 0x1000000
    > nand write 0x81000000 0x1000000 ${filesize}
    > setenv bootpart 2
    > saveenv

Revert to stock firmware
--------------

1.  Revert to stock U-Boot environment variable.
    > setenv bootpart 1
    > saveenv

MAC addresses as verified by OEM firmware
--------------

   WAN: *:XX (label)
   LAN: *:XX + 1
  2.4G: *:XX + 3
    5G: *:XX + 4

The label MAC address was found in art 0x0.

Credits
--------------

Credit goes to the @manatails who first developed how to port OpenWRT
to this device and had a significant impact on this patch.

And thanks to @adschm and @mans0n for guiding me to revise the code
in many ways.

Signed-off-by: Jihoon Han <rapid_renard@renard.ga>
Reviewed-by: Sungbo Eo <mans0n@gorani.run>
Tested-by: Sungbo Eo <mans0n@gorani.run>

1 files changed, 48 insertions, 0 deletions

diff --git a/target/linux/ath79/image/nand.mk b/target/linux/ath79/image/nand.mk
index 8d3d2ce5b2..b34e796ac3 100644
--- a/target/linux/ath79/image/nand.mk
+++ b/target/linux/ath79/image/nand.mk
@@ -1,3 +1,16 @@
+define Build/dw-headers
+	head -c 4 $@ >> $@.tmp && \
+	head -c 8 /dev/zero >> $@.tmp && \
+	tail -c +9 $@ >> $@.tmp && \
+	( \
+		header_crc="$$(head -c 68 $@.tmp | gzip -c | \
+			tail -c 8 | od -An -N4 -tx4 --endian little | tr -d ' \n')"; \
+		printf "$$(echo $$header_crc | sed 's/../\\x&/g')" | \
+			dd of=$@.tmp bs=4 count=1 seek=1 conv=notrunc \
+	)
+	mv $@.tmp $@
+endef
+
 # attention: only zlib compression is allowed for the boot fs
 define Build/zyxel-buildkerneljffs
 	mkdir -p $@.tmp/boot
@@ -76,6 +89,41 @@ define Device/domywifi_dw33d
 endef
 TARGET_DEVICES += domywifi_dw33d
 
+define Device/dongwon_dw02-412h
+  SOC := qca9557
+  DEVICE_VENDOR := Dongwon T&I
+  DEVICE_MODEL := DW02-412H
+  DEVICE_ALT0_VENDOR := KT
+  DEVICE_ALT0_MODEL := GiGA WiFi home
+  DEVICE_PACKAGES := kmod-usb2 kmod-ath10k-ct ath10k-firmware-qca988x-ct
+  KERNEL_SIZE := 8192k
+  BLOCKSIZE := 128k
+  PAGESIZE := 2048
+  KERNEL := kernel-bin | append-dtb | lzma | uImage lzma | dw-headers
+  KERNEL_INITRAMFS := kernel-bin | append-dtb | lzma | uImage lzma | dw-headers
+  UBINIZE_OPTS := -E 5
+  IMAGES += factory.img
+  IMAGE/factory.img := append-kernel | pad-to $$$$(KERNEL_SIZE) | append-ubi | \
+	check-size
+  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
+endef
+
+define Device/dongwon_dw02-412h-64m
+  $(Device/dongwon_dw02-412h)
+  DEVICE_VARIANT := (64M)
+  DEVICE_ALT0_VARIANT := (64M)
+  IMAGE_SIZE := 49152k
+endef
+TARGET_DEVICES += dongwon_dw02-412h-64m
+
+define Device/dongwon_dw02-412h-128m
+  $(Device/dongwon_dw02-412h)
+  DEVICE_VARIANT := (128M)
+  DEVICE_ALT0_VARIANT := (128M)
+  IMAGE_SIZE := 114688k
+endef
+TARGET_DEVICES += dongwon_dw02-412h-128m
+
 define Device/glinet_gl-ar300m-common-nand
   SOC := qca9531
   DEVICE_VENDOR := GL.iNet