ath79: add support for MikroTik RouterBOARD 493G (rb4xx series)

This patch adds support for the MikroTik RouterBOARD RB493G, ported
from the ar71xx target.

See https://routerboard.com/RB493G for details

Specification:
- SoC Qualcomm Atheros AR7161
- RAM: 256 MiB
- Storage: 128MiB NAND
- Ethernet: 9x 1000/100/10 Mbps
- USB 1x 2.0 / 1.0 type A
- PCIe: 3x Mini slot
- MicroSD slot

Working:
- Board/system detection
- Ethernet
- SPI
- NAND
- LEDs
- USB
- Sysupgrade

Enabled (but untested due to lack of hardware):
- PCIe - ath79_pci_irq struct has the slot/pin/IRQ mappings if needed

Installation methods:
- tftp boot initramfs image, scp then flash via "sysupgrade -n"
- nand boot existing OpenWrt, scp then flash via "sysupgrade -n"

Notes:
- initramfs image will not work if uncompressed image size over ~8.5Mb
- The "rb4xx" drivers have been enabled

Signed-off-by: Christopher Hill <ch6574@gmail.com>

7 files changed, 259 insertions, 0 deletions

diff --git a/config/Config-images.in b/config/Config-images.in
index 4c54ac9399..27e644d2a4 100644
--- a/config/Config-images.in
+++ b/config/Config-images.in
@@ -16,6 +16,7 @@ menu "Target Images"
 			prompt "Compression"
 			default TARGET_INITRAMFS_COMPRESSION_LZMA if TARGET_apm821xx
 			default TARGET_INITRAMFS_COMPRESSION_LZMA if TARGET_ar71xx
+			default TARGET_INITRAMFS_COMPRESSION_LZMA if TARGET_ath79_mikrotik
 			default TARGET_INITRAMFS_COMPRESSION_LZMA if TARGET_lantiq
 			default TARGET_INITRAMFS_COMPRESSION_LZMA if TARGET_mpc85xx
 			default TARGET_INITRAMFS_COMPRESSION_LZMA if TARGET_ramips
diff --git a/target/linux/ath79/dts/ar7100_mikrotik_routerboard-4xx.dtsi b/target/linux/ath79/dts/ar7100_mikrotik_routerboard-4xx.dtsi
new file mode 100644
index 0000000000..e957a51e27
--- /dev/null
+++ b/target/linux/ath79/dts/ar7100_mikrotik_routerboard-4xx.dtsi
@@ -0,0 +1,180 @@
+// SPDX-License-Identifier: GPL-1.0-or-later OR MIT
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+#include "ar7100.dtsi"
+
+/ {
+	aliases {
+		led-boot = &led_user;
+		led-failsafe = &led_user;
+		led-running = &led_user;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,115200";
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_user: user {
+			label = "mikrotik:yellow:user";
+			gpios = <&gpio 4 GPIO_ACTIVE_HIGH>;
+			default-state = "on";
+		};
+
+		led1 {
+			label = "mikrotik:green:led1";
+			gpios = <&cpld_gpio 0 GPIO_ACTIVE_LOW>;
+		};
+
+		led2 {
+			label = "mikrotik:green:led2";
+			gpios = <&cpld_gpio 2 GPIO_ACTIVE_LOW>;
+		};
+
+		led3 {
+			label = "mikrotik:green:led3";
+			gpios = <&cpld_gpio 1 GPIO_ACTIVE_LOW>;
+		};
+
+		led4 {
+			label = "mikrotik:green:led4";
+			gpios = <&cpld_gpio 3 GPIO_ACTIVE_LOW>;
+		};
+
+		led5 {
+			label = "mikrotik:green:led5";
+			gpios = <&cpld_gpio 8 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&uart {
+	status = "okay";
+};
+
+&gpio {
+	ngpios = <31>;
+	gpio-line-names =
+		"",     "", "", "", "LED", "RDY",  "",  "MDC",
+		"MDIO", "", "", "", "",    "",     "",  "",
+		"",     "", "", "", "",    "",     "",  "",
+		"",     "", "", "", "",    "",     "",  "";
+};
+
+&pcie0 {
+	status = "okay";
+};
+
+&spi {
+	status = "okay";
+
+	compatible = "mikrotik,rb4xx-spi";
+
+	flash@0 {
+		compatible = "pm25lv512", "jedec,spi-nor";
+
+		reg = <0>;
+		spi-max-frequency = <25000000>;
+
+		partitions {
+			compatible = "mikrotik,routerboot-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "routerboot1";
+				reg = <0x0 0x0>;
+				read-only;
+			};
+
+			hard_config {
+				label = "hard_config";
+				read-only;
+			};
+
+			bios {
+				label = "bios";
+				size = <0x1000>;
+				read-only;
+			};
+
+			routerboot2 {
+				label = "routerboot2";
+				read-only;
+			};
+
+			soft_config {
+				label = "soft_config";
+			};
+		};
+	};
+
+	cpld@1 {
+		compatible = "mikrotik,rb4xx-cpld";
+
+		reg = <1>;
+		spi-max-frequency = <25000000>;
+
+		cpld_gpio: gpio {
+			compatible = "mikrotik,rb4xx-gpio";
+
+			base = <32>;
+
+			gpio-controller;
+			#gpio-cells = <2>;
+			gpio-line-names =
+				"LED1", "LED2", "LED3", "LED4",
+				"FAN",  "ALE",  "CLE",  "nCE",
+				"LED5";
+		};
+
+		nand {
+			compatible = "mikrotik,rb4xx-nand";
+
+			gpios = <&cpld_gpio 5 GPIO_ACTIVE_HIGH>, // ALE
+				<&cpld_gpio 6 GPIO_ACTIVE_HIGH>, // CLE
+				<&cpld_gpio 7 GPIO_ACTIVE_HIGH>, // nCE
+				<&gpio      5 GPIO_ACTIVE_HIGH>; // RDY
+
+			partitions {
+				compatible = "fixed-partitions";
+				#address-cells = <1>;
+				#size-cells = <1>;
+
+				partition@0 {
+					label = "booter";
+					reg = <0x0000000 0x0040000>;
+					read-only;
+				};
+
+				partition@40000 {
+					label = "kernel";
+					reg = <0x0040000 0x0800000>;
+				};
+
+				partition@840000 {
+					label = "ubi";
+					reg = <0x0840000 0x77c0000>;
+				};
+			};
+		};
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	phy-handle = <&phy0>;
+};
+
+&mdio0 {
+	status = "okay";
+
+	phy0: ethernet-phy@0 {
+		reg = <0>;
+	};
+};
diff --git a/target/linux/ath79/dts/ar7161_mikrotik_routerboard-493g.dts b/target/linux/ath79/dts/ar7161_mikrotik_routerboard-493g.dts
new file mode 100644
index 0000000000..4a5deb8a44
--- /dev/null
+++ b/target/linux/ath79/dts/ar7161_mikrotik_routerboard-493g.dts
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-1.0-or-later OR MIT
+/dts-v1/;
+
+#include "ar7100_mikrotik_routerboard-4xx.dtsi"
+
+/ {
+	compatible = "mikrotik,routerboard-493g", "qca,ar7161";
+	model = "MikroTik RouterBOARD 493G";
+
+	aliases {
+		mdio-gpio0 = &mdio_gpio0;
+	};
+};
+
+&spi {
+	sdcard: mmc-slot@2 {
+		compatible = "mmc-spi-slot";
+
+		reg = <2>;
+		spi-max-frequency = <25000000>;
+	};
+};
+
+&eth1 {
+	status = "okay";
+
+	phy-handle = <&gpio_phy0>;
+
+	mdio_gpio0: mdio-gpio {
+		compatible = "virtual,mdio-gpio";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		gpios = <&gpio 7 GPIO_ACTIVE_HIGH>, // MDC
+			<&gpio 8 GPIO_ACTIVE_HIGH>; // MDIO
+
+		gpio_phy0: ethernet-phy@0 {
+			reg = <0>;
+		};
+	};
+};
+
+&usb_phy {
+	status = "okay";
+};
+
+&usb2 {
+	status = "okay";
+};
+
+&usb1 {
+	status = "okay";
+};
diff --git a/target/linux/ath79/image/mikrotik.mk b/target/linux/ath79/image/mikrotik.mk
index a9ff129816..b0bd05a81c 100644
--- a/target/linux/ath79/image/mikrotik.mk
+++ b/target/linux/ath79/image/mikrotik.mk
@@ -1,5 +1,16 @@
 include ./common-mikrotik.mk
 
+define Device/mikrotik_routerboard-493g
+  $(Device/mikrotik)
+  SOC := ar7161
+  DEVICE_MODEL := RouterBOARD 493G
+  IMAGE/sysupgrade.bin = append-kernel | kernel2minor -s 2048 -e -c | \
+	sysupgrade-tar kernel=$$$$@ | append-metadata
+  DEVICE_PACKAGES += kmod-usb-ohci kmod-usb2 nand-utils
+  SUPPORTED_DEVICES += rb-493g
+endef
+TARGET_DEVICES += mikrotik_routerboard-493g
+
 define Device/mikrotik_routerboard-922uags-5hpacd
   $(Device/mikrotik)
   SOC := qca9558
diff --git a/target/linux/ath79/mikrotik/base-files/etc/board.d/02_network b/target/linux/ath79/mikrotik/base-files/etc/board.d/02_network
index 7f8327f764..96e0f5610a 100755
--- a/target/linux/ath79/mikrotik/base-files/etc/board.d/02_network
+++ b/target/linux/ath79/mikrotik/base-files/etc/board.d/02_network
@@ -8,6 +8,13 @@ ath79_setup_interfaces()
 	local board="$1"
 
 	case "$board" in
+	mikrotik,routerboard-493g)
+		ucidef_set_interfaces_lan_wan "eth0.1 eth1.1" "eth0.2"
+		ucidef_add_switch "switch0" \
+			"0@eth0" "1:lan:4" "2:lan:1" "3:lan:3" "4:lan:2" "5:wan"
+		ucidef_add_switch "switch1" \
+			"0@eth1" "1:lan:4" "2:lan:1" "3:lan:2" "4:lan:3"
+		;;
 	mikrotik,routerboard-922uags-5hpacd|\
 	mikrotik,routerboard-wap-g-5hact2hnd)
 		ucidef_set_interface_lan "eth0"
diff --git a/target/linux/ath79/mikrotik/base-files/lib/upgrade/platform.sh b/target/linux/ath79/mikrotik/base-files/lib/upgrade/platform.sh
index d2e43d404f..8d11cfc0ce 100644
--- a/target/linux/ath79/mikrotik/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ath79/mikrotik/base-files/lib/upgrade/platform.sh
@@ -31,6 +31,7 @@ platform_do_upgrade() {
 	local board=$(board_name)
 
 	case "$board" in
+	mikrotik,routerboard-493g|\
 	mikrotik,routerboard-922uags-5hpacd)
 		platform_do_upgrade_mikrotik_nand "$1"
 		;;
diff --git a/target/linux/ath79/mikrotik/config-default b/target/linux/ath79/mikrotik/config-default
index 94c63f82fb..ec34a7c143 100644
--- a/target/linux/ath79/mikrotik/config-default
+++ b/target/linux/ath79/mikrotik/config-default
@@ -2,16 +2,20 @@ CONFIG_AT803X_PHY=y
 CONFIG_CRC16=y
 CONFIG_CRYPTO_DEFLATE=y
 CONFIG_GPIO_LATCH=y
+CONFIG_GPIO_RB4XX=y
 CONFIG_GPIO_WATCHDOG=y
 CONFIG_GPIO_WATCHDOG_ARCH_INITCALL=y
 CONFIG_LEDS_RESET=y
 CONFIG_LZO_DECOMPRESS=y
+CONFIG_MDIO_GPIO=y
+CONFIG_MFD_RB4XX_CPLD=y
 CONFIG_MIKROTIK=y
 CONFIG_MIKROTIK_RB_SYSFS=y
 CONFIG_MTD_NAND=y
 CONFIG_MTD_NAND_AR934X=y
 CONFIG_MTD_NAND_CORE=y
 CONFIG_MTD_NAND_ECC=y
+CONFIG_MTD_NAND_RB4XX=y
 CONFIG_MTD_RAW_NAND=y
 CONFIG_MTD_ROUTERBOOT_PARTS=y
 CONFIG_MTD_SPI_NAND=y
@@ -24,10 +28,12 @@ CONFIG_MTD_UBI_BEB_LIMIT=20
 # CONFIG_MTD_UBI_FASTMAP is not set
 # CONFIG_MTD_UBI_GLUEBI is not set
 CONFIG_NET_SWITCHDEV=y
+CONFIG_PCI_AR71XX=y
 CONFIG_PHY_AR7100_USB=y
 CONFIG_PHY_AR7200_USB=y
 CONFIG_REGULATOR=y
 CONFIG_REGULATOR_FIXED_VOLTAGE=y
+CONFIG_SPI_RB4XX=y
 CONFIG_UBIFS_FS=y
 CONFIG_UBIFS_FS_ADVANCED_COMPR=y
 CONFIG_UBIFS_FS_LZO=y