ramips: add xiaomi_miwifi-r3 support (#3839)

* ramips: add xiaomi_miwifi-r3 support

Specification:
 - CPU: 580 MHz
 - Flash size: 128 MiB NAND
 - RAM size: 128 MiB DDR2
 - Wireless No1: SoC-integrated: MT7620A 2x2 MIMO 802.11b/g/n (2.4 GHz)
 - Wireless No2: On-board chip: MT7612E 2x2 MIMO 802.11a/n/ac (5 GHz)
 - Switch: MT7620 built-in 10/100 switch w/ vlan support
 - USB: 2.0 x1

Flash instructions:
 1. access ssh via https://wiki.openwrt.org/toh/xiaomi/mir3
 2. in ssh:
      nvram set flag_last_success=1
      nvram set boot_wait=on
      nvram set uart_en=1
      nvram commit
      mtd write lede-ramips-mt7620-miwifi-r3-squashfs-kernel1.bin kernel1
      mtd write lede-ramips-mt7620-miwifi-r3-squashfs-rootfs0.bin rootfs0
      reboot

If you want to revert back to stock fw while on LEDE:
  insert usb stick (FAT/FAT32) with stock fw renamed to miwifi.bin
  fw_setenv flag_last_success 0
  power off the device
  hold the reset button and power on the device, keep holding the reset button until yellow led starts blinking.

Signed-off-by: Chen Minqiang <ptpt52@gmail.com>

* ramips: add mt7620-nand driver for NAND flash

This add the mt7620-nand driver
and enable nand ubifs for subtarget mt7620

Signed-off-by: Chen Minqiang <ptpt52@gmail.com>

Co-authored-by: Chen Minqiang <ptpt52@gmail.com>

package/boot/uboot-envtools/files/ramips

@@ -34,7 +34,8 @@ zbtlink,zbt-wg2626)
 	ubootenv_add_uci_config "/dev/mtd1" "0x0" "0x1000" "0x10000"
 	;;
 xiaomi,mir3p|\
-xiaomi,mir3g)
+xiaomi,mir3g|\
+xiaomi,miwifi-r3)
 	ubootenv_add_uci_config "/dev/mtd1" "0x0" "0x1000" "0x20000"
 	;;
 esac

target/linux/ramips/dts/mt7620a_xiaomi_miwifi-r3.dts

@@ -0,0 +1,169 @@
+/dts-v1/;
+
+#include "mt7620a.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "xiaomi,miwifi-r3", "ralink,mt7620a-soc";
+	model = "Xiaomi Mi Router R3";
+
+	aliases {
+		led-status = &led_status_blue;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,115200";
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			gpios = <&gpio1 6 GPIO_ACTIVE_HIGH>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_status_blue: blue {
+			label = "miwifi-r3:blue:status";
+			gpios = <&gpio1 0 GPIO_ACTIVE_LOW>;
+			default-state = "on";
+		};
+
+		yellow {
+			label = "miwifi-r3:yellow:status";
+			gpios = <&gpio1 2 GPIO_ACTIVE_LOW>;
+		};
+
+		red {
+			label = "miwifi-r3:red:status";
+			gpios = <&gpio1 5 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	nand {
+		status = "okay";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "mtk,mt7620-nand";
+
+		partition@0 {
+			label = "Bootloader";
+			reg = <0x0 0x40000>;
+			read-only;
+		};
+
+		partition@40000 {
+			label = "Config";
+			reg = <0x40000 0x40000>;
+		};
+
+		partition@80000 {
+			label = "Bdata";
+			reg = <0x80000 0x40000>;
+			read-only;
+		};
+
+		factory: partition@0xc0000 {
+			label = "factory";
+			reg = <0xc0000 0x40000>;
+			read-only;
+		};
+
+		partition@100000 {
+			label = "crash";
+			reg = <0x100000 0x40000>;
+			read-only;
+		};
+
+		partition@140000 {
+			label = "crash_syslog";
+			reg = <0x140000 0x40000>;
+			read-only;
+		};
+
+		partition@180000 {
+			label = "reserved0";
+			reg = <0x180000 0x80000>;
+			read-only;
+		};
+
+		partition@200000 {
+			label = "kernel_stock";
+			reg = <0x200000 0x400000>;
+		};
+
+		partition@600000 {
+			label = "kernel";
+			reg = <0x600000 0x400000>;
+		};
+
+		/* ubi partition is the result of squashing
+		 * next consequent stock partitions:
+		 * - rootfs0 (rootfs partition for stock kernel0),
+		 * - rootfs1 (rootfs partition for stock failsafe kernel1),
+		 * - overlay (used as ubi overlay in stock fw)
+		 * resulting 117,5MiB space for packages.
+		 */
+		partition@a00000 {
+			label = "ubi";
+			reg = <0xa00000 0x7600000>;
+		};
+	};
+};
+
+&gpio1 {
+	status = "okay";
+};
+
+&ehci {
+	status = "okay";
+};
+
+&ohci {
+	status = "okay";
+};
+
+&ethernet {
+	pinctrl-names = "default";
+	pinctrl-0 = <&ephy_pins>;
+	mtd-mac-address = <&factory 0x28>;
+	mediatek,portmap = "llllw";
+};
+
+&wmac {
+	ralink,mtd-eeprom = <&factory 0>;
+};
+
+&pcie {
+	status = "okay";
+};
+
+&pcie0 {
+	wifi@0,0 {
+		compatible = "pci14c3,7662";
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x8000>;
+		ieee80211-freq-limit = <5000000 6000000>;
+	};
+};
+
+&pinctrl {
+	state_default: pinctrl0 {
+		gpio {
+			ralink,group = "rgmii1";
+			ralink,function = "gpio";
+		};
+
+		pa {
+			ralink,group = "pa";
+			ralink,function = "pa";
+		};
+	};
+};

target/linux/ramips/image/mt7620.mk

@@ -984,6 +984,23 @@ define Device/xiaomi_miwifi-mini
 endef
 TARGET_DEVICES += xiaomi_miwifi-mini
 
+define Device/xiaomi_miwifi-r3
+  SOC := mt7620a
+  BLOCKSIZE := 128k
+  PAGESIZE := 2048
+  KERNEL_SIZE := 4096k
+  IMAGE_SIZE := 32768k
+  UBINIZE_OPTS := -E 5
+  IMAGES += kernel1.bin rootfs0.bin
+  IMAGE/kernel1.bin := append-kernel | check-size $$$$(KERNEL_SIZE)
+  IMAGE/rootfs0.bin := append-ubi | check-size $$$$(IMAGE_SIZE)
+  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
+  DEVICE_VENDOR := Xiaomi
+  DEVICE_MODEL := Mi Router R3
+  DEVICE_PACKAGES := kmod-mt76x2 kmod-usb2 kmod-usb-ohci uboot-envtools
+endef
+TARGET_DEVICES += xiaomi_miwifi-r3
+
 define Device/youku_yk1
   SOC := mt7620a
   IMAGE_SIZE := 32448k

target/linux/ramips/mt7620/base-files/etc/board.d/02_network

@@ -197,6 +197,10 @@ ramips_setup_interfaces()
 		ucidef_add_switch "switch0" \
 			"0:lan" "4:wan" "6@eth0"
 		;;
+	xiaomi,miwifi-r3)
+		ucidef_add_switch "switch0" \
+			"1:lan" "4:lan" "0:wan" "6@eth0"
+		;;
 	zbtlink,zbt-we1026-5g-16m)
 		ucidef_add_switch "switch0" \
 			"0:lan" "6t@eth0"
@@ -326,6 +330,10 @@ ramips_setup_macs()
 	tplink,archer-mr200)
 		wan_mac=$(macaddr_add "$(mtd_get_mac_binary rom 0xf100)" 1)
 		;;
+	xiaomi,miwifi-r3)
+		wan_mac=$(mtd_get_mac_binary factory 0x28)
+		lan_mac=$(macaddr_setbit_la "$wan_mac")
+		;;
 	zbtlink,zbt-we1026-5g-16m)
 		label_mac=$(mtd_get_mac_binary factory 0x4)
 		;;

target/linux/ramips/mt7620/base-files/lib/upgrade/platform.sh

@@ -30,6 +30,13 @@ platform_do_upgrade() {
 		}
 		default_do_upgrade "$1"
 		;;
+	xiaomi,miwifi-r3)
+		# this make it compatible with breed
+		dd if=/dev/mtd0 bs=64 count=1 2>/dev/null | grep -qi breed && CI_KERNPART_EXT="kernel_stock"
+		dd if=/dev/mtd7 bs=64 count=1 2>/dev/null | grep -o MIPS.*Linux | grep -qi X-WRT && CI_KERNPART_EXT="kernel_stock"
+		dd if=/dev/mtd7 bs=64 count=1 2>/dev/null | grep -o MIPS.*Linux | grep -qi NATCAP && CI_KERNPART_EXT="kernel0_rsvd"
+		nand_do_upgrade "$1"
+		;;
 	*)
 		default_do_upgrade "$1"
 		;;

target/linux/ramips/mt7620/config-4.14

@@ -47,6 +47,10 @@ CONFIG_CPU_R4K_FPU=y
 CONFIG_CPU_SUPPORTS_32BIT_KERNEL=y
 CONFIG_CPU_SUPPORTS_HIGHMEM=y
 CONFIG_CPU_SUPPORTS_MSA=y
+CONFIG_CRC16=y
+CONFIG_CRYPTO_ACOMP2=y
+CONFIG_CRYPTO_DEFLATE=y
+CONFIG_CRYPTO_LZO=y
 CONFIG_CRYPTO_RNG2=y
 CONFIG_CRYPTO_WORKQUEUE=y
 CONFIG_CSRC_R4K=y
@@ -130,6 +134,8 @@ CONFIG_IRQ_INTC=y
 CONFIG_IRQ_MIPS_CPU=y
 CONFIG_IRQ_WORK=y
 CONFIG_LIBFDT=y
+CONFIG_LZO_COMPRESS=y
+CONFIG_LZO_DECOMPRESS=y
 CONFIG_MARVELL_PHY=y
 CONFIG_MDIO_BUS=y
 CONFIG_MDIO_DEVICE=y
@@ -154,6 +160,7 @@ CONFIG_MODULES_USE_ELF_REL=y
 # CONFIG_MTD_CFI_INTELEXT is not set
 CONFIG_MTD_CMDLINE_PARTS=y
 CONFIG_MTD_M25P80=y
+CONFIG_MTD_NAND_MT7620=y
 CONFIG_MTD_PHYSMAP=y
 CONFIG_MTD_SPI_NOR=y
 CONFIG_MTD_SPI_NOR_USE_4K_SECTORS=y
@@ -162,6 +169,12 @@ CONFIG_MTD_SPLIT_JIMAGE_FW=y
 CONFIG_MTD_SPLIT_SEAMA_FW=y
 CONFIG_MTD_SPLIT_TPLINK_FW=y
 CONFIG_MTD_SPLIT_UIMAGE_FW=y
+CONFIG_MTD_UBI=y
+CONFIG_MTD_UBI_BEB_LIMIT=20
+CONFIG_MTD_UBI_BLOCK=y
+# CONFIG_MTD_UBI_FASTMAP is not set
+# CONFIG_MTD_UBI_GLUEBI is not set
+CONFIG_MTD_UBI_WL_THRESHOLD=4096
 CONFIG_NEED_DMA_MAP_STATE=y
 CONFIG_NEED_PER_CPU_KM=y
 CONFIG_NET_MEDIATEK_GSW_MT7620=y
@@ -231,6 +244,13 @@ CONFIG_TICK_CPU_ACCOUNTING=y
 CONFIG_TIMER_OF=y
 CONFIG_TIMER_PROBE=y
 CONFIG_TINY_SRCU=y
+CONFIG_UBIFS_ATIME_SUPPORT=y
+CONFIG_UBIFS_FS=y
+CONFIG_UBIFS_FS_ADVANCED_COMPR=y
+CONFIG_UBIFS_FS_LZO=y
+CONFIG_UBIFS_FS_ZLIB=y
 CONFIG_USB_SUPPORT=y
 CONFIG_USE_OF=y
 CONFIG_WATCHDOG_CORE=y
+CONFIG_ZLIB_DEFLATE=y
+CONFIG_ZLIB_INFLATE=y

target/linux/ramips/mt7620/target.mk

@@ -4,7 +4,7 @@
 
 SUBTARGET:=mt7620
 BOARDNAME:=MT7620 based boards
-FEATURES+=usb ramdisk
+FEATURES+=usb nand ramdisk
 CPU_TYPE:=24kc
 
 DEFAULT_PACKAGES += kmod-rt2800-soc wpad-openssl

target/linux/ramips/mt76x8/config-4.14

@@ -151,6 +151,7 @@ CONFIG_MT7621_WDT=y
 # CONFIG_MTD_CFI_INTELEXT is not set
 CONFIG_MTD_CMDLINE_PARTS=y
 CONFIG_MTD_M25P80=y
+# CONFIG_MTD_NAND_MT7620 is not set
 CONFIG_MTD_PHYSMAP=y
 CONFIG_MTD_SPI_NOR=y
 CONFIG_MTD_SPLIT_TPLINK_FW=y

target/linux/ramips/rt305x/config-4.14

@@ -131,6 +131,7 @@ CONFIG_MODULES_USE_ELF_REL=y
 # CONFIG_MTD_CFI_INTELEXT is not set
 CONFIG_MTD_CMDLINE_PARTS=y
 CONFIG_MTD_M25P80=y
+# CONFIG_MTD_NAND_MT7620 is not set
 CONFIG_MTD_PHYSMAP=y
 CONFIG_MTD_SPI_NOR=y
 CONFIG_MTD_SPI_NOR_USE_4K_SECTORS=y