ARM: dts: ixp4xx: Add USRobotics USR8200 device tree

This is a USRobotics NAS/Firewall/router that has been supported
by OpenWrt in the past. It had dedicated users so let's get it
properly supported.

Some debugging and fixing was provided by Howard Harte.

Link: https://lore.kernel.org/r/20231007-ixp4xx-usr8200-v1-1-aded3d6ff6f1@linaro.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

2 files changed, 231 insertions, 1 deletions

diff --git a/arch/arm/boot/dts/intel/ixp/Makefile b/arch/arm/boot/dts/intel/ixp/Makefile
index 1a25ce3cf84f..ab8525f1ea1d 100644
--- a/arch/arm/boot/dts/intel/ixp/Makefile
+++ b/arch/arm/boot/dts/intel/ixp/Makefile
@@ -16,4 +16,5 @@ dtb-$(CONFIG_ARCH_IXP4XX) += \
 	intel-ixp43x-gateworks-gw2358.dtb \
 	intel-ixp42x-netgear-wg302v1.dtb \
 	intel-ixp42x-arcom-vulcan.dtb \
-	intel-ixp42x-gateway-7001.dtb
+	intel-ixp42x-gateway-7001.dtb \
+	intel-ixp42x-usrobotics-usr8200.dtb
diff --git a/arch/arm/boot/dts/intel/ixp/intel-ixp42x-usrobotics-usr8200.dts b/arch/arm/boot/dts/intel/ixp/intel-ixp42x-usrobotics-usr8200.dts
new file mode 100644
index 000000000000..90fd51b36e7d
--- /dev/null
+++ b/arch/arm/boot/dts/intel/ixp/intel-ixp42x-usrobotics-usr8200.dts
@@ -0,0 +1,229 @@
+// SPDX-License-Identifier: ISC
+/*
+ * Device Tree file for the USRobotics USR8200 firewall
+ * VPN and NAS. Based on know-how from Peter Denison.
+ *
+ * This machine is based on IXP422, the USR internal codename
+ * is "Jeeves".
+ */
+
+/dts-v1/;
+
+#include "intel-ixp42x.dtsi"
+#include <dt-bindings/input/input.h>
+
+/ {
+	model = "USRobotics USR8200";
+	compatible = "usr,usr8200", "intel,ixp42x";
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x00000000 0x4000000>;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,115200n8";
+		stdout-path = "uart1:115200n8";
+	};
+
+	aliases {
+		/* These are switched around */
+		serial0 = &uart1;
+		serial1 = &uart0;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		ieee1394_led: led-1394 {
+			label = "usr8200:green:1394";
+			gpios = <&gpio0 0 GPIO_ACTIVE_LOW>;
+			default-state = "off";
+		};
+		usb1_led: led-usb1 {
+			label = "usr8200:green:usb1";
+			gpios = <&gpio0 1 GPIO_ACTIVE_LOW>;
+			default-state = "off";
+		};
+		usb2_led: led-usb2 {
+			label = "usr8200:green:usb2";
+			gpios = <&gpio0 2 GPIO_ACTIVE_LOW>;
+			default-state = "off";
+		};
+		wireless_led: led-wireless {
+			/*
+			 * This LED is mounted inside the case but cannot be
+			 * seen from the outside: probably USR planned at one
+			 * point for the device to have a wireless card, then
+			 * changed their mind and didn't mount it, leaving the
+			 * LED in place.
+			 */
+			label = "usr8200:green:wireless";
+			gpios = <&gpio0 3 GPIO_ACTIVE_LOW>;
+			default-state = "off";
+		};
+		pwr_led: led-pwr {
+			label = "usr8200:green:pwr";
+			gpios = <&gpio0 14 GPIO_ACTIVE_HIGH>;
+			default-state = "on";
+			linux,default-trigger = "heartbeat";
+		};
+	};
+
+	gpio_keys {
+		compatible = "gpio-keys";
+
+		button-reset {
+			wakeup-source;
+			linux,code = <KEY_RESTART>;
+			label = "reset";
+			gpios = <&gpio0 12 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	soc {
+		bus@c4000000 {
+			flash@0,0 {
+				compatible = "intel,ixp4xx-flash", "cfi-flash";
+				bank-width = <2>;
+				/* Enable writes on the expansion bus */
+				intel,ixp4xx-eb-write-enable = <1>;
+				/* 16 MB of Flash mapped in at CS0 */
+				reg = <0 0x00000000 0x1000000>;
+
+				partitions {
+					compatible = "redboot-fis";
+					/* Eraseblock at 0x0fe0000 */
+					fis-index-block = <0x7f>;
+				};
+			};
+			rtc@2,0 {
+				/* EPSON RTC7301 DG DIL-capsule */
+				compatible = "epson,rtc7301dg";
+				/*
+				 * These timing settings were found in the boardfile patch:
+				 * IXP4XX_EXP_CS2 = 0x3fff000 | IXP4XX_EXP_BUS_SIZE(0) | IXP4XX_EXP_BUS_WR_EN |
+				 *                  IXP4XX_EXP_BUS_CS_EN | IXP4XX_EXP_BUS_BYTE_EN;
+				 */
+				intel,ixp4xx-eb-t1 = <0>; // no cycles extra address phase
+				intel,ixp4xx-eb-t2 = <0>; // no cycles extra setup phase
+				intel,ixp4xx-eb-t3 = <15>; // 15 cycles extra strobe phase
+				intel,ixp4xx-eb-t4 = <3>; // 3 cycles extra hold phase
+				intel,ixp4xx-eb-t5 = <15>; // 15 cycles extra recovery phase
+				intel,ixp4xx-eb-cycle-type = <0>; // Intel cycle
+				intel,ixp4xx-eb-byte-access-on-halfword = <0>;
+				intel,ixp4xx-eb-mux-address-and-data = <0>;
+				intel,ixp4xx-eb-ahb-split-transfers = <0>;
+				intel,ixp4xx-eb-write-enable = <1>;
+				intel,ixp4xx-eb-byte-access = <1>;
+				/* 512 bytes at CS2 */
+				reg = <2 0x00000000 0x0000200>;
+				reg-io-width = <1>;
+				native-endian;
+				/* FIXME: try to check if there is an IRQ for the RTC? */
+			};
+		};
+
+		pci@c0000000 {
+			status = "okay";
+
+			/*
+			 * Taken from USR8200 boardfile from OpenWrt
+			 *
+			 * We have 3 slots (IDSEL) with partly swizzled IRQs on slot 16.
+			 * We assume the same IRQ for all pins on the remaining slots, that
+			 * is what the boardfile was doing.
+			 */
+			#interrupt-cells = <1>;
+			interrupt-map-mask = <0xf800 0 0 7>;
+			interrupt-map =
+			/* IDSEL 14 used for "Wireless" in the board file */
+			<0x7000 0 0 1 &gpio0 7  IRQ_TYPE_LEVEL_LOW>, /* INT A on slot 14 is irq 7 */
+			/* IDSEL 15 used for VIA VT6307 IEEE 1394 Firewire */
+			<0x7800 0 0 1 &gpio0 8  IRQ_TYPE_LEVEL_LOW>, /* INT A on slot 15 is irq 8 */
+			/* IDSEL 16 used for VIA VT6202 USB 2.0 4+1 */
+			<0x8000 0 0 1 &gpio0 11 IRQ_TYPE_LEVEL_LOW>, /* INT A on slot 16 is irq 11 */
+			<0x8000 0 0 2 &gpio0 10 IRQ_TYPE_LEVEL_LOW>, /* INT B on slot 16 is irq 10 */
+			<0x8000 0 0 3 &gpio0 9  IRQ_TYPE_LEVEL_LOW>; /* INT C on slot 16 is irq 9 */
+		};
+
+		gpio@c8004000 {
+			/* Enable clock out on GPIO 15 */
+			intel,ixp4xx-gpio15-clkout;
+		};
+
+		/* EthB WAN */
+		ethernet@c8009000 {
+			status = "okay";
+			queue-rx = <&qmgr 3>;
+			queue-txready = <&qmgr 20>;
+			phy-mode = "rgmii";
+			phy-handle = <&phy9>;
+
+			mdio {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				phy9: ethernet-phy@9 {
+					reg = <9>;
+				};
+
+				/* The switch uses MDIO addresses 16 thru 31 */
+				switch@16 {
+					compatible = "marvell,mv88e6060";
+					reg = <16>;
+
+					ports {
+						#address-cells = <1>;
+						#size-cells = <0>;
+
+						port@0 {
+							reg = <0>;
+							label = "lan1";
+						};
+
+						port@1 {
+							reg = <1>;
+							label = "lan2";
+						};
+
+						port@2 {
+							reg = <2>;
+							label = "lan3";
+						};
+
+						port@3 {
+							reg = <3>;
+							label = "lan4";
+						};
+
+						port@5 {
+							/* Port 5 is the CPU port according to the MV88E6060 datasheet */
+							reg = <5>;
+							phy-mode = "rgmii-id";
+							ethernet = <&ethc>;
+							label = "cpu";
+							fixed-link {
+								speed = <100>;
+								full-duplex;
+							};
+						};
+					};
+				};
+			};
+		};
+
+		/* EthC LAN connected to the Marvell DSA Switch */
+		ethc: ethernet@c800a000 {
+			status = "okay";
+			queue-rx = <&qmgr 4>;
+			queue-txready = <&qmgr 21>;
+			phy-mode = "rgmii";
+			fixed-link {
+				speed = <100>;
+				full-duplex;
+			};
+		};
+	};
+};