ramips: add support for Buffalo WSR-2533DHPL2

Buffalo WSR-2533DHPL2 is a 2.4/5 GHz band 11ac (Wi-Fi 5) router, based
on MediaTek MT7621A.

Specification:

- SoC           : MediaTek MT7621AT
- RAM           : DDR3 128 MiB (Winbond W631GG6MB12J)
- Flash         : RAW-NAND 128 MiB (Winbond W29N01HVSINF)
- WLAN          : 2.4/5 GHz (2x MediaTek MT7615N)
- Ethernet      : 10/100/1000 Mbps x4
  - Switch      : MediaTek MT7530 (SoC)
- LED/keys      : 8x/6x (2x buttons, 1x slide-switch)
- UART          : through-hole on PCB (J4)
  - arrangement : 3.3V, GND, TX, RX from triangle-mark
  - settings    : 57600n8
- Power         : 12VDC 1.5A

Flash instruction using factory.bin image:

1. boot WSR-2533DHPL2 normally with "Router" mode
2. access to the WebI ("http://192.168.11.1/") on the device and open
   firmware update page
   ("管理" -> "ファームウェア更新")
3. select the OpenWrt factory.bin image and click update ("更新実行")
   button
   Attention: do not use "factory-uboot.bin" image
4. Wait ~120 seconds to complete flashing

Flash instruction using initramfs image:

1. prepare the TFTP server with the initramfs image renamed to
   "linux.trx-recovery" and IP address "192.168.11.2"
2. press the "AOSS" button while powering on the WSR-2533DHPL2
3. after 10 seconds, release the "AOSS" button, WSR-2533DHPL2 downloads
   the initramfs image and boot with it automatically
4. on the initramfs image, download the factory-uboot.bin image to the
   device and perform sysupgrade with it and "-F" option
5. wait ~120 seconds to complete flashing

Notes:

- There are 2x factory*.bin images for different purposes.

  - factory.bin      : for flashing on OEM WebUI
  - factory-uboot.bin: for flashing on OEM bootloader or initramfs image

  factory-uboot.bin is useful for recoverying the device, or refreshing
  when the kernel partition is expanded in the future. sysupgrade on
  this device accepts factory-uboot.bin with option "-F", but on that
  situation, user configurations won't be kept, so it's not for normal
  use.

MAC addresses:

LAN    : 18:EC:E7:xx:xx:E0 (board_data, "mac" (text))
WAN    : 18:EC:E7:xx:xx:E0 (board_data, "mac" (text))
2.4 GHz: 18:EC:E7:xx:xx:E1 (Factory, 0x4    (hex))
5 GHz  : 18:EC:E7:xx:xx:E4 (Factory, 0x8004 (hex))

Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>

target/linux/ramips/dts/mt7621_buffalo_wsr-2533dhpl2.dts

@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "mt7621_buffalo_wsr-2533dhplx.dtsi"
+
+/ {
+	compatible = "buffalo,wsr-2533dhpl2", "mediatek,mt7621-soc";
+	model = "Buffalo WSR-2533DHPL2";
+
+	chosen {
+		bootargs = "console=ttyS0,57600n8 ubi.block=0,rootfs root=/dev/ubiblock0_0";
+	};
+};
+
+&nand {
+	status = "okay";
+
+	mediatek,bbt;
+	/*
+	 * -  u-boot - (kernel (6MiB, in "firmware"))
+	 * - Kernel2 - board_data
+	 */
+	mediatek,bmt-remap-range = <0x0 0x740000>,
+				   <0x3e60000 0x4120000>;
+};
+
+&partitions {
+	partition@100000 {
+		label = "factory";
+		reg = <0x100000 0x40000>;
+		read-only;
+
+		nvmem-layout {
+			compatible = "fixed-layout";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			eeprom_factory_0: eeprom@0 {
+				reg = <0x0 0x4da8>;
+			};
+
+			eeprom_factory_8000: eeprom@8000 {
+				reg = <0x8000 0x4da8>;
+			};
+		};
+	};
+
+	partition@140000 {
+		compatible = "brcm,trx";
+		brcm,trx-magic = <0x324c4850>;
+		label = "firmware";
+		reg = <0x140000 0x3d20000>;
+	};
+
+	partition@3e60000 {
+		label = "Kernel2";
+		reg = <0x3e60000 0x3d20000>;
+	};
+
+	partition@7b80000 {
+		label = "glbcfg";
+		reg = <0x7b80000 0x200000>;
+		read-only;
+	};
+
+	partition@7d80000 {
+		label = "board_data";
+		reg = <0x7d80000 0x200000>;
+		read-only;
+	};
+};

target/linux/ramips/image/mt7621.mk

@@ -563,6 +563,14 @@ define Device/buffalo_wsr-2533dhplx
 	sysupgrade-tar kernel=$$$$@ | append-metadata
 endef
 
+define Device/buffalo_wsr-2533dhpl2
+  $(Device/buffalo_wsr-2533dhplx)
+  DEVICE_MODEL := WSR-2533DHPL2
+  BUFFALO_TRX_MAGIC := 0x324c4850
+  IMAGE_SIZE := 62592k
+endef
+TARGET_DEVICES += buffalo_wsr-2533dhpl2
+
 define Device/buffalo_wsr-2533dhpls
   $(Device/buffalo_wsr-2533dhplx)
   DEVICE_MODEL := WSR-2533DHPLS

target/linux/ramips/mt7621/base-files/etc/board.d/02_network

@@ -11,6 +11,7 @@ ramips_setup_interfaces()
 	alfa-network,ax1800rm|\
 	ampedwireless,ally-r1900k|\
 	asus,rt-ax53u|\
+	buffalo,wsr-2533dhpl2|\
 	buffalo,wsr-2533dhpls|\
 	gehua,ghl-r-001|\
 	h3c,tx1800-plus|\
@@ -217,6 +218,7 @@ ramips_setup_macs()
 		lan_mac=$label_mac
 		;;
 	buffalo,wsr-1166dhp|\
+	buffalo,wsr-2533dhpl2|\
 	buffalo,wsr-2533dhpls)
 		wan_mac=$(mtd_get_mac_ascii board_data "mac")
 		lan_mac=$wan_mac

target/linux/ramips/mt7621/base-files/etc/uci-defaults/09_fix_crc

@@ -13,6 +13,9 @@ fixup_trx_crc() {
 }
 
 case "$(board_name)" in
+buffalo,wsr-2533dhpl2)
+	fixup_trx_crc 0x50484c32
+	;;
 buffalo,wsr-2533dhpls)
 	fixup_trx_crc 0x44484C53
 	;;

target/linux/ramips/mt7621/base-files/lib/upgrade/buffalo.sh

@@ -17,6 +17,9 @@
 
 # TRX magic numbers of each model
 case "$(board_name)" in
+buffalo,wsr-2533dhpl2)
+	BUFFALO_TRX_MAGIC="50484c32" # "PHL2"
+	;;
 buffalo,wsr-2533dhpls)
 	BUFFALO_TRX_MAGIC="44484c53" # "DHLS"
 	;;

target/linux/ramips/mt7621/base-files/lib/upgrade/platform.sh

@@ -15,6 +15,7 @@ platform_check_image() {
 	[ "$#" -gt 1 ] && return 1
 
 	case "$board" in
+	buffalo,wsr-2533dhpl2|\
 	buffalo,wsr-2533dhpls)
 		buffalo_check_image "$board" "$magic" "$1" || return 1
 		;;
@@ -143,6 +144,7 @@ platform_do_upgrade() {
 	zyxel,nwa55axe)
 		nand_do_upgrade "$1"
 		;;
+	buffalo,wsr-2533dhpl2|\
 	buffalo,wsr-2533dhpls)
 		buffalo_do_upgrade "$1"
 		;;