ath79: add support for Ditel DT-ACU100

Ditel DT-ACU100 is a ceiling mount Router with PoE support,
based on Qualcomm/Atheros QCA9531@650MHz SoC.

Short specification:

- QCA9531 650 MHz SoC
- 1x 10/100/1000 Mbps Ethernet (wan/eth1)
- 1x 10/100/1000 Mbps Ethernet (lan/eth0)
- 128MB of DDR2 RAM (Winbond W971GG6SB)
- 16 MB of FLASH (Winbond W25Q128FV)
- 2T2R 2.4 GHz, 802.11b/g/n (wlan2g)
- 1x RGB LED, 1x button
- UART header on PCB with proper labelling

Initial flashing instructions:

Original firmware is based on OpenWrt.

a) Use sysupgrade image directly in vendor GUI.

b) Or via tftp:

  ipaddr=192.168.1.1
  serverip=192.168.1.10
  bootfile="firmware.bin"

c) Or possibly via u-boot's `httpd` command.

MAC-address mapping follows original firmware:

* eth1 (wan) is the lowest mac address (art @ 0x0)
* eth0 (lan) uses eth1 + 1 (art @ 0x1000)
* wlan2g (phy0) uses eth1 + 2 (art @ 0x06)
* unused MAC (eth1 + 3) (art @ 0x5006)

Art dump (`hexdump /dev/mtd1 |grep ZZZZ`):

0000000 ZZZZ XXXX XXX0 ZZZZ XXXX XXX2 ffff ffff
0001000 0202 ZZZZ XXXX XXX1 0000 0000 0000 0000
0005000 202f bd21 0101 ZZZZ XXXX XXX3 0000 2000

flash Stock :

0x000000-0x040000(u-boot)
00x000000-0x050000(u-boot-env)
0x050000-0xfe0000(firmware)
0xfe0000-0xff0000(ditel)
0xff0000-0x1000000(art)

dev:    size   erasesize  name
mtd0: 00040000 00010000 "u-boot"
mtd1: 00010000 00010000 "u-boot-env"
mtd2: 00f90000 00010000 "firmware"
mtd3: 00290000 00010000 "kernel"
mtd4: 00d00000 00010000 "rootfs"
mtd5: 00190000 00010000 "rootfs_data"
mtd6: 00010000 00010000 "ditel"
mtd7: 00010000 00010000 "art"

Root access to original firmware (only via UART) can be achieved by
making a backup of configuration from web interface. Backup contains
whole `/etc` directory...

package/boot/uboot-envtools/files/ath79

@@ -83,6 +83,7 @@ yuncore,a782|\
 yuncore,a930|\
 yuncore,xd3200|\
 yuncore,xd4200|\
+ditel,dt-acu100|\
 ziking,cpe46b|\
 zyxel,nbg6616)
 	ubootenv_add_uci_config "/dev/mtd1" "0x0" "0x10000" "0x10000"

target/linux/ath79/dts/qca9531_ditel_dt-acu100.dts

@@ -0,0 +1,165 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "qca953x.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/leds/common.h>
+
+/ {
+	compatible = "ditel,dt-acu100", "qca,qca9531";
+	model = "Ditel DT-ACU100";
+
+	aliases {
+		led-boot = &led_status;
+		led-failsafe = &led_status;
+		led-running = &led_status;
+		led-upgrade = &led_status;
+		label-mac-device = &eth1;
+		serial0 = &uart;
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 4 GPIO_ACTIVE_HIGH>;
+			debounce-interval = <60>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_status: status {
+			function = LED_FUNCTION_STATUS;
+			color = <LED_COLOR_ID_GREEN>;
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+		};
+
+		led_wlan: wlan {
+			function = LED_FUNCTION_WLAN;
+			color = <LED_COLOR_ID_RED>;
+			gpios = <&gpio 14 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy0tpt";
+		};
+	};
+
+	i2c: i2c {
+		compatible = "i2c-gpio";
+
+		sda-gpios = <&gpio 3 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
+		scl-gpios = <&gpio 15 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
+	};
+};
+
+&spi {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <25000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "u-boot";
+				reg = <0x000000 0x040000>;
+				read-only;
+			};
+
+			partition@40000 {
+				label = "u-boot-env";
+				reg = <0x040000 0x010000>;
+			};
+
+			firmware: partition@50000 {
+				label = "firmware";
+				reg = <0x050000 0xf90000>;
+				compatible = "denx,uimage";
+			};
+
+			ditel: partition@fe0000 {
+				label = "ditel";
+				reg = <0xfe0000 0x010000>;
+				read-only;
+			};
+
+			art: partition@ff0000 {
+				label = "art";
+				reg = <0xff0000 0x010000>;
+				read-only;
+
+				nvmem-layout {
+					compatible = "fixed-layout";
+					#address-cells = <1>;
+					#size-cells = <1>;
+
+					macaddr_art_0: macaddr@0 {
+						reg = <0x0 0x6>;
+					};
+
+					macaddr_art_6: macaddr@6 {
+						reg = <0x6 0x6>;
+					};
+
+					cal_art_1000: calibration@1000 {
+						reg = <0x1000 0x440>;
+					};
+
+				};
+			};
+		};
+	};
+};
+
+&usb0 {
+	status = "okay";
+};
+
+&usb_phy {
+	status = "okay";
+};
+
+&uart {
+	status = "okay";
+};
+
+&eth0 {
+	status = "okay";
+
+	phy-handle = <&swphy0>;
+
+	nvmem-cells = <&macaddr_art_6>;
+	nvmem-cell-names = "mac-address";
+};
+
+&eth1 {
+	phy-handle = <&swphy4>;
+
+	nvmem-cells = <&macaddr_art_0>;
+	nvmem-cell-names = "mac-address";
+
+	gmac-config {
+		device = <&gmac>;
+		switch-phy-swap = <1>;
+	};
+};
+
+&pcie0 {
+	status = "okay";
+};
+
+&wmac {
+	status = "okay";
+
+	nvmem-cells = <&cal_art_1000>;
+	nvmem-cell-names = "calibration";
+};
+

target/linux/ath79/generic/base-files/etc/board.d/01_leds

@@ -540,6 +540,9 @@ wd,mynet-wifi-rangeextender)
 xiaomi,aiot-ac2350)
 	ucidef_set_led_switch "wan" "WAN" "blue:wan" "switch0" "0x02"
 	;;
+ditel,dt-acu100)
+	ucidef_set_led_netdev "wan" "WAN" "red:wan" "eth0"
+	;;
 yuncore,a770)
 	ucidef_set_led_netdev "wan" "WAN" "green:wan" "eth1"
 	ucidef_set_led_switch "lan" "LAN" "green:lan" "switch0" "0x10"

target/linux/ath79/generic/base-files/etc/board.d/02_network

@@ -472,6 +472,11 @@ ath79_setup_interfaces()
 		ucidef_add_switch "switch0" \
 			"0@eth1" "1:lan" "2:lan" "3:lan" "4:lan"
 		;;
+	ditel,dt-acu100)
+		ucidef_set_interface_wan "eth1"
+		ucidef_add_switch "switch0" \
+			"0u@eth0" "1:lan:1" "2:lan:4" "3:lan:3" "4:lan:2"
+		;;
 	phicomm,k2t)
 		ucidef_add_switch "switch0" \
 			"0@eth0" "3:lan:1" "5:lan:2" "4:wan"

target/linux/ath79/image/generic.mk

@@ -3243,6 +3243,17 @@ define Device/xiaomi_mi-router-4q
 endef
 TARGET_DEVICES += xiaomi_mi-router-4q
 
+define Device/ditel_dt-acu100
+  SOC := qca9531
+  DEVICE_VENDOR := Ditel
+  DEVICE_MODEL := DT-ACU100
+  DEVICE_PACKAGES := -kmod-ath9k -uboot-envtools kmod-usb2
+  IMAGE_SIZE := 15936k
+  LOADER_FLASH_OFFS := 0x50000
+  SUPPORTED_DEVICES += dt-acu100
+endef
+TARGET_DEVICES += ditel_dt-acu100
+
 define Device/yuncore_a770
   SOC := qca9531
   DEVICE_VENDOR := YunCore