ath79: add support for Linksys EA4500 v3

Add support for the Linksys EA4500 v3 wireless router

Hardware
--------
SoC:    Qualcomm Atheros QCA9558
RAM:    128M DDR2 (Winbond W971GG6KB-25)
FLASH:  128M SPI-NAND (Spansion S34ML01G100TFI00)
WLAN:   QCA9558 3T3R 802.11 bgn
        QCA9580 3T3R 802.11 an
ETH:    Qualcomm Atheros QCA8337
UART:   115200 8n1, same as ea4500 v2
USB:	1 single USB 2.0 host port
BUTTON: Reset - WPS
LED:    1x system-LED
        LEDs besides the ethernet ports are controlled
        by the ethernet switch

MAC Address:
 use        address(sample 1)    source
 label      94:10:3e:xx:xx:6f   caldata@cal_macaddr
 lan        94:10:3e:xx:xx:6f   $label
 wan        94:10:3e:xx:xx:6f   $label
 WiFi4_2G   94:10:3e:xx:xx:70   caldata@cal_ath9k_soc
 WiFi4_5G   94:10:3e:xx:xx:71   caldata@cal_ath9k_pci

Installation from Serial Console
------------

1. Connect to the serial console. Power up the device and interrupt
   autoboot when prompted

2. Connect a TFTP server reachable at 192.168.1.0/24
   (e.g. 192.168.1.66) to the ethernet port. Serve the OpenWrt
   initramfs image as "openwrt.bin"

3. To test OpenWrt only, go to step 4 and never execute step 5;
   To install, auto_recovery should be disabled first, and boot_part
   should be set to 1 if its current value is not.

   ath> setenv auto_recovery no
   ath> setenv boot_part 1
   ath> saveenv

4. Boot the initramfs image using U-Boot

   ath> setenv serverip 192.168.1.66
   ath> tftpboot 0x84000000 openwrt.bin
   ath> bootm

5. Copy the OpenWrt sysupgrade image to the device using scp and
   install it like a normal upgrade (with no need to keeping config
   since no config from "previous OpenWRT installation" could be kept
   at all)

   # sysupgrade -n /path/to/openwrt/sysupgrade.bin

Note: Like many other routers produced by Linksys, it has a dual
      firmware flash layout, but because I do not know how to handle
      it, I decide to disable it for more usable space. (That is why
      the "auto_recovery" above should be disabled before installing
      OpenWRT.) If someone is interested in generating factory
      firmware image capable to flash from stock firmware, as well as
      restoring the dual firmware layout, commented-out layout for the
      original secondary partitions left in the device tree may be a
      useful hint.

Installation from Web Interface
------------

1. Login to the router via its web interface (default password: admin)

2. Find the firmware update interface under "Connectivity/Basic"

3. Choose the OpenWrt factory image and click "Start"

4. If the router still boots into the stock firmware, it means that
   the OpenWrt factory image has been installed to the secondary
   partitions and failed to boot (since OpenWrt on EA4500 v3 does not
   support dual boot yet), and the router switched back to the stock
   firmware on the primary partitions. You have to install a stock
   firmware (e.g. 3.1.6.172023, downloadable from
   https://www.linksys.com/support-article?articleNum=148385 ) first
   (to the secondary partitions) , and after that, install OpenWrt
   factory image (to the primary partitions). After successful
   installation of OpenWrt, auto_recovery will be automatically
   disabled and router will only boot from the primary partitions.

Signed-off-by: Edward Chow <equu@openmail.cc>

4 files changed, 238 insertions, 0 deletions

diff --git a/target/linux/ath79/dts/qca9558_linksys_ea4500-v3.dts b/target/linux/ath79/dts/qca9558_linksys_ea4500-v3.dts
new file mode 100644
index 0000000000..000dbce8e1
--- /dev/null
+++ b/target/linux/ath79/dts/qca9558_linksys_ea4500-v3.dts
@@ -0,0 +1,211 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "qca955x.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "linksys,ea4500-v3", "qca,qca9558";
+	model = "Linksys EA4500 v3";
+
+	aliases {
+		led-boot = &led_system;
+		led-failsafe = &led_system;
+		led-running = &led_system;
+		led-upgrade = &led_system;
+		label-mac-device = &eth1;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_system: system {
+			label = "green:system";
+			gpios = <&gpio 21 GPIO_ACTIVE_HIGH>;
+			default-state = "on";
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 17 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+
+		wps {
+			label = "wps";
+			linux,code = <KEY_WPS_BUTTON>;
+			gpios = <&gpio 16 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+	};
+};
+
+&pcie0 {
+	status = "okay";
+
+	wifi@0,0 {
+		compatible = "pci168c,0033";
+		reg = <0x0000 0 0 0 0>;
+		nvmem-cells = <&cal_ath9k_pci>;
+		nvmem-cell-names = "calibration";
+	};
+};
+
+&usb_phy0 {
+	status = "okay";
+};
+
+&usb0 {
+	status = "okay";
+};
+
+&nand {
+	status = "okay";
+
+	partitions {
+		compatible = "fixed-partitions";
+
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		partition@0 {
+			label = "uboot";
+			reg = <0x0 0x100000>;
+			read-only;
+		};
+
+		partition@100000 {
+			label = "u_env";
+			reg = <0x100000 0x40000>;
+		};
+
+		partition@140000 {
+			label = "caldata";
+			reg = <0x140000 0x40000>;
+			read-only;
+
+			compatible = "nvmem-cells";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			cal_macaddr: macaddr@0 {
+				reg = <0x6 0x6>;
+			};
+
+			cal_ath9k_soc: cal_ath9k@1000 {
+				reg = <0x1000 0x440>;
+			};
+
+			cal_ath9k_pci: cal_ath9k@5000 {
+				reg = <0x5000 0x440>;
+			};
+		};
+
+		partition@180000 {
+			label = "s_env";
+			reg = <0x180000 0x40000>;
+			read-only;
+		};
+
+		partition@1c0000 {
+			label = "devinfo";
+			reg = <0x1c0000 0x100000>;
+			read-only;
+		};
+
+		partition@2c0000 {
+			label = "firmware";
+			reg = <0x2c0000 0x5000000>;
+
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "kernel";
+				reg = <0x0 0x400000>;
+			};
+
+			partition@400000 {
+				label = "ubi";
+				reg = <0x400000 0x4c00000>;
+			};
+
+			/* Original layout for secondary partitions */
+			/* partition@2800000 {
+				label = "kernel2";
+				reg = <0x2800000 0x400000>;
+			};
+
+			partition@2c00000 {
+				label = "ubi2";
+				reg = <0x2c00000 0x2400000>;
+			}; */
+		};
+
+		partition@52c0000 {
+			label = "syscfg";
+			reg = <0x52c0000 0x2d40000>;
+			read-only;
+		};
+	};
+};
+
+&mdio0 {
+	status = "okay";
+
+	phy0: ethernet-phy@0 {
+		reg = <0>;
+
+		qca,ar8327-initvals = <
+			0x04 0x07600000 /* PORT0 PAD MODE CTRL: RGMII, to eth0 */
+			0x0c 0x00000080 /* PORT6 PAD MODE CTRL: SGMII, to eth1 */
+			0x50 0xc833c833 /* LED_CTRL0: orange, blinking with act */
+			0x54 0xcf85cf85 /* LED_CTRL1: green, on with link */
+			0x58 0x00000000	/* LED_CTRL2: unpopulated */
+			0x5c 0x00f3cf00 /* LED_CTRL3: enable led 0 and 1 */
+			0x7c 0x0000007e /* PORT0_STATUS */
+			0x94 0x0000007e /* PORT6 STATUS */
+		>;
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	nvmem-cells = <&cal_macaddr>;
+	nvmem-cell-names = "mac-address";
+	phy-handle = <&phy0>;
+	pll-data = <0x96000000 0x00000101 0x00001616>;
+
+	gmac-config {
+		device = <&gmac>;
+		rgmii-enabled = <1>;
+	};
+};
+
+&eth1 {
+	status = "okay";
+
+	nvmem-cells = <&cal_macaddr>;
+	nvmem-cell-names = "mac-address";
+	pll-data = <0x03000101 0x00000101 0x00001616>;
+
+	fixed-link {
+		speed = <1000>;
+		full-duplex;
+	};
+};
+
+&wmac {
+	status = "okay";
+
+	nvmem-cells = <&cal_ath9k_soc>;
+	nvmem-cell-names = "calibration";
+};
diff --git a/target/linux/ath79/image/nand.mk b/target/linux/ath79/image/nand.mk
index 117f6e99cd..9da47ad38e 100644
--- a/target/linux/ath79/image/nand.mk
+++ b/target/linux/ath79/image/nand.mk
@@ -211,6 +211,25 @@ define Device/glinet_gl-xe300
 endef
 TARGET_DEVICES += glinet_gl-xe300
 
+define Device/linksys_ea4500-v3
+  SOC := qca9558
+  DEVICE_VENDOR := Linksys
+  DEVICE_MODEL := EA4500
+  DEVICE_VARIANT := v3
+  DEVICE_PACKAGES := kmod-usb2
+  BLOCKSIZE := 128k
+  PAGESIZE := 2048
+  KERNEL_SIZE := 4096k
+  IMAGE_SIZE := 81920k
+  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
+  LINKSYS_HWNAME := EA4500V3
+  IMAGES += factory.img
+  IMAGE/factory.img := append-kernel | pad-to $$$$(KERNEL_SIZE) | \
+	append-ubi | check-size | linksys-image type=$$$$(LINKSYS_HWNAME)
+  UBINIZE_OPTS := -E 5
+endef
+TARGET_DEVICES += linksys_ea4500-v3
+
 # fake rootfs is mandatory, pad-offset 129 equals (2 * uimage_header + 0xff)
 define Device/netgear_ath79_nand
   DEVICE_VENDOR := NETGEAR
diff --git a/target/linux/ath79/nand/base-files/etc/board.d/02_network b/target/linux/ath79/nand/base-files/etc/board.d/02_network
index b252d7d9e8..b163b29db1 100644
--- a/target/linux/ath79/nand/base-files/etc/board.d/02_network
+++ b/target/linux/ath79/nand/base-files/etc/board.d/02_network
@@ -30,6 +30,10 @@ ath79_setup_interfaces()
 		ucidef_add_switch "switch0" \
 			"0@eth0" "4:lan"
 		;;
+	linksys,ea4500-v3)
+		ucidef_add_switch "switch0" \
+			"6@eth1" "1:lan" "2:lan" "3:lan" "4:lan" "5:wan" "0@eth0"
+		;;
 	netgear,pgzng1)
 		ucidef_set_interfaces_lan_wan "eth1" "eth0"
 		;;
diff --git a/target/linux/ath79/nand/base-files/etc/init.d/bootcount b/target/linux/ath79/nand/base-files/etc/init.d/bootcount
index 87654ba095..4d7a814f05 100755
--- a/target/linux/ath79/nand/base-files/etc/init.d/bootcount
+++ b/target/linux/ath79/nand/base-files/etc/init.d/bootcount
@@ -8,5 +8,9 @@ boot() {
 	glinet,gl-ar300m-nand)
 		fw_setenv bootcount 0
 		;;
+	linksys,ea4500-v3)
+		[ $(fw_printenv -n auto_recovery) = yes ] && \
+			fw_setenv auto_recovery no
+		;;
 	esac
 }