realtek: add support for Panasonic Switch-M8eG PN28080K

Panasonic Switch-M8eG PN28080K is a 8 + 1 port gigabit switch, based on
RTL8380M.

Specification:

- SoC		: Realtek RTL8380M
- RAM		: DDR3 128 MiB (Winbond W631GG8KB-15)
- Flash		: SPI-NOR 32 MiB (Macronix MX25L25635FMI-10G)
- Ethernet	: 10/100/1000 Mbps x8 + 1
  - port 1-8	: TP, RTL8218B (SoC)
  - port 9	: SFP, RTL8380M (SoC)
- LEDs/Keys	: 7x / 1x
- UART		: RS-232 port on the front panel (connector: RJ-45)
  - 3:TX, 4:GND, 5:GND, 6:RX (pin number: RJ-45)
  - 9600n8
- Power		: 100-240 VAC, 50/60 Hz, 0.5 A
  - Plug	: IEC 60320-C13
- Stock OS	: VxWorks based

Flash instruction using initramfs image:

1.  Prepare the TFTP server with the IP address 192.168.1.111
2.  Rename the OpenWrt initramfs image to "0101A8C0.img" and place it to
    the TFTP directory
3.  Download the official upgrading firmware (ex: pn28080k_v30000.rom)
    and place it to the TFTP directory
4.  Boot M8eG and interrupt the U-Boot with Ctrl + C keys
5.  Execute the following commands and boot with the OpenWrt initramfs
    image

    rtk network on
    tftpboot 0x81000000
    bootm

6.  Backup mtdblock files to the computer by scp or anything and reboot
7.  Interrupt the U-Boot and execute the following commands to re-create
    filesystem in the flash

    ffsmount c:/
    ffsfmt c:/

    this step takes a long time, about ~ 4 mins

8.  Execute the following commands to put the official images to the
    filesystem

    updatert <official image>

    example:

      updatert pn28080k_v30000.rom

    this step takes about ~ 40 secs

9.  Set the environment variables of the U-Boot by the following commands

    setenv loadaddr 0xb4e00000
    setenv bootcmd bootm
    saveenv

10: Download the OpenWrt initramfs image and boot with it

    tftpboot 0x81000000 0101A8C0.img
    bootm

11: On the initramfs image, download the sysupgrade image and perform
    sysupgrade with it

    sysupgrade <imagename>

12: Wait ~ 120 seconds to complete flashing

Note:

- "Switch-M8eG" is a model name, and "PN28080K" is a model number.
  Switch-M8eG has an another (old) model number ("PN28080"), it's not a
  Realtek based hardware.

- Switch-M8eG has a "POWER" LED (Green), but it's not connected to any
  GPIO pin.

- The U-Boot checks the runtime images in the flash when booting and
  fails to execute anything in "bootcmd" variable if the images are not
  exsisting.

- A filesystem is formed in the flash (0x100000-0x1DFFFFF) on the stock
  firmware and it includes the stock images, configuration files and
  checksum files. It's unknown format, can't be managed on the OpenWrt.
  To get the enough space for OpenWrt, move the filesystem to the head
  of "fs_reserved" partition by execution of "ffsfmt" and "updatert".

- On the other devices in the same series of Switch-M8eG PN28080K, the
  INT pin on the PCA9555 is not connected to anywhere.

Back to the stock firmware:

1. Delete "loadaddr" variable and set "bootcmd" to the original value

   on U-Boot:

     setenv loadaddr
     setenv bootcmd 'bootm 0x81000000'

   on OpenWrt:

     fw_setenv loadaddr
     fw_setenv bootcmd 'bootm 0x81000000'

2. Perform reset or reboot

  on U-Boot:

    reset

  on OpenWrt:

    reboot

Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>
Reviewed-by: Sander Vanheule <sander@svanheule.net>

3 files changed, 338 insertions, 0 deletions

diff --git a/target/linux/realtek/dts-5.10/rtl8380_panasonic_m8eg-pn28080k.dts b/target/linux/realtek/dts-5.10/rtl8380_panasonic_m8eg-pn28080k.dts
new file mode 100644
index 0000000000..f9d58f5b66
--- /dev/null
+++ b/target/linux/realtek/dts-5.10/rtl8380_panasonic_m8eg-pn28080k.dts
@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "rtl838x.dtsi"
+#include "rtl83xx_panasonic_mxxeg-pn28xx0k.dtsi"
+
+#include <dt-bindings/interrupt-controller/irq.h>
+
+/ {
+	compatible = "panasonic,m8eg-pn28080k", "realtek,rtl8380-soc";
+	model = "Panasonic Switch-M8eG PN28080K";
+
+	aliases {
+		led-boot = &led_status_eco_green;
+		led-failsafe = &led_status_eco_amber;
+		led-running = &led_status_eco_green;
+		led-upgrade = &led_status_eco_green;
+	};
+
+	sfp0: sfp-p9 {
+		compatible = "sff,sfp";
+		i2c-bus = <&i2c0>;
+		tx-fault-gpio = <&gpio1 0 GPIO_ACTIVE_HIGH>;
+		tx-disable-gpio = <&gpio1 1 GPIO_ACTIVE_HIGH>;
+		mod-def0-gpio = <&gpio1 2 GPIO_ACTIVE_LOW>;
+		los-gpio = <&gpio1 3 GPIO_ACTIVE_HIGH>;
+	};
+};
+
+&leds {
+	led_status_eco_amber: led-5 {
+		label = "amber:status_eco";
+		gpios = <&gpio2 1 GPIO_ACTIVE_LOW>;
+		color = <LED_COLOR_ID_AMBER>;
+		function = LED_FUNCTION_STATUS;
+		function-enumerator = <1>;
+	};
+
+	led_status_eco_green: led-6 {
+		label = "green:status_eco";
+		gpios = <&gpio2 2 GPIO_ACTIVE_LOW>;
+		color = <LED_COLOR_ID_GREEN>;
+		function = LED_FUNCTION_STATUS;
+		function-enumerator = <2>;
+	};
+};
+
+&i2c_gpio_0 {
+	scl-gpios = <&gpio0 0 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	sda-gpios = <&gpio0 1 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+};
+
+&i2c_gpio_1 {
+	scl-gpios = <&gpio0 12 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	sda-gpios = <&gpio0 13 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+};
+
+&gpio1 {
+	interrupt-controller;
+	#interrupt-cells = <2>;
+	interrupt-parent = <&gpio0>;
+	interrupts = <2 IRQ_TYPE_EDGE_FALLING>;
+};
+
+&gpio2 {
+	interrupt-controller;
+	#interrupt-cells = <2>;
+	interrupt-parent = <&gpio0>;
+	interrupts = <2 IRQ_TYPE_EDGE_FALLING>;
+};
+
+&i2c_switch {
+	i2c0: i2c@0 {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		reg = <0>;
+	};
+};
+
+&ethernet0 {
+	mdio-bus {
+		compatible = "realtek,rtl838x-mdio";
+		regmap = <&ethernet0>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		INTERNAL_PHY(8)
+		INTERNAL_PHY(9)
+		INTERNAL_PHY(10)
+		INTERNAL_PHY(11)
+		INTERNAL_PHY(12)
+		INTERNAL_PHY(13)
+		INTERNAL_PHY(14)
+		INTERNAL_PHY(15)
+
+		INTERNAL_PHY(24)
+	};
+};
+
+&switch0 {
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		SWITCH_PORT(8, 1, internal)
+		SWITCH_PORT(9, 2, internal)
+		SWITCH_PORT(10, 3, internal)
+		SWITCH_PORT(11, 4, internal)
+		SWITCH_PORT(12, 5, internal)
+		SWITCH_PORT(13, 6, internal)
+		SWITCH_PORT(14, 7, internal)
+		SWITCH_PORT(15, 8, internal)
+
+		port@24 {
+			reg = <24>;
+			label = "lan9";
+			phy-mode = "1000base-x";
+			phy-handle = <&phy24>;
+			managed = "in-band-status";
+			sfp = <&sfp0>;
+		};
+
+		port@28 {
+			ethernet = <&ethernet0>;
+			reg = <28>;
+			phy-mode = "internal";
+
+			fixed-link {
+				speed = <1000>;
+				full-duplex;
+			};
+		};
+	};
+};
diff --git a/target/linux/realtek/dts-5.10/rtl83xx_panasonic_mxxeg-pn28xx0k.dtsi b/target/linux/realtek/dts-5.10/rtl83xx_panasonic_mxxeg-pn28xx0k.dtsi
new file mode 100644
index 0000000000..48aa1849d6
--- /dev/null
+++ b/target/linux/realtek/dts-5.10/rtl83xx_panasonic_mxxeg-pn28xx0k.dtsi
@@ -0,0 +1,195 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/leds/common.h>
+
+/ {
+	chosen {
+		bootargs = "console=ttyS0,9600";
+	};
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x0 0x8000000>;
+	};
+
+	leds: leds {
+		compatible = "gpio-leds";
+
+		led-0 {
+			label = "amber:any_col";
+			gpios = <&gpio2 0 GPIO_ACTIVE_LOW>;
+			color = <LED_COLOR_ID_AMBER>;
+			function = LED_FUNCTION_FAULT;
+		};
+
+		led-1 {
+			label = "green:giga";
+			gpios = <&gpio2 8 GPIO_ACTIVE_LOW>;
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_INDICATOR;
+			function-enumerator = <1>;
+		};
+
+		led-2 {
+			label = "green:100m";
+			gpios = <&gpio2 9 GPIO_ACTIVE_LOW>;
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_INDICATOR;
+			function-enumerator = <2>;
+		};
+
+		led-3 {
+			label = "green:full";
+			gpios = <&gpio2 10 GPIO_ACTIVE_LOW>;
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_INDICATOR;
+			function-enumerator = <3>;
+		};
+
+		led-4 {
+			label = "green:loop_history";
+			gpios = <&gpio2 11 GPIO_ACTIVE_LOW>;
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_INDICATOR;
+			function-enumerator = <4>;
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		led_mode {
+			label = "led-mode";
+			gpios = <&gpio2 15 GPIO_ACTIVE_LOW>;
+			linux,code = <BTN_0>;
+		};
+	};
+
+	gpio-restart {
+		compatible = "gpio-restart";
+		gpios = <&gpio2 3 GPIO_ACTIVE_HIGH>;
+	};
+
+	i2c_gpio_0: i2c-gpio-0 {
+		compatible = "i2c-gpio";
+		i2c-gpio,delay-us = <2>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		gpio1: gpio@20 {
+			compatible = "nxp,pca9555";
+			reg = <0x20>;
+			gpio-controller;
+			#gpio-cells = <2>;
+		};
+
+		gpio2: gpio@75 {
+			compatible = "nxp,pca9539";
+			reg = <0x75>;
+			gpio-controller;
+			#gpio-cells = <2>;
+
+			/*
+			 * GPIO14 (IO1_6): Shift Register RESET (port LED)
+			 * - Switch-M8eG  PN28080K:  3x 74HC164
+			 * - Switch-M24eG PN28240K:  6x 74HC164
+			 * - Switch-M48eG PN28480K: 12x 74HC164
+			 */
+			portled_sregister_reset {
+				gpio-hog;
+				gpios = <14 GPIO_ACTIVE_HIGH>;
+				output-high;
+				line-name = "portled-sregister-reset";
+			};
+		};
+	};
+
+	i2c_gpio_1: i2c-gpio-1 {
+		compatible = "i2c-gpio";
+		i2c-gpio,delay-us = <2>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		i2c_switch: i2c-switch@70 {
+			compatible = "nxp,pca9545";
+			reset-gpios = <&gpio2 13 GPIO_ACTIVE_LOW>;
+			reg = <0x70>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+	};
+};
+
+&spi0 {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <10000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "u-boot";
+				reg = <0x0 0x80000>;
+				read-only;
+			};
+
+			partition@80000 {
+				label = "u-boot-env";
+				reg = <0x80000 0x10000>;
+			};
+
+			partition@90000 {
+				label = "u-boot-env2";
+				reg = <0x90000 0x10000>;
+			};
+
+			partition@a0000 {
+				label = "sysinfo";
+				reg = <0xa0000 0x60000>;
+				read-only;
+			};
+
+			/*
+			 * Filesystem area in stock firmware
+			 * (0x100000-0x1DFFFFF)
+			 *
+			 * stock firmware images are required to pass
+			 * the checking by the U-Boot, also for OpenWrt
+			 *
+			 * in OpenWrt:
+			 * - 0x100000-0xDFFFFF (13M): stock images
+			 * - 0xE00000-0x1DFFFFF(16M): OpenWrt image
+			 */
+			partition@100000 {
+				label = "fs_reserved";
+				reg = <0x100000 0xd00000>;
+			};
+
+			partition@e00000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0xe00000 0x1000000>;
+			};
+
+			partition@1e00000 {
+				label = "vlog_data";
+				reg = <0x1e00000 0x100000>;
+				read-only;
+			};
+
+			partition@1f00000 {
+				label = "elog_data";
+				reg = <0x1f00000 0x100000>;
+				read-only;
+			};
+		};
+	};
+};
diff --git a/target/linux/realtek/image/rtl838x.mk b/target/linux/realtek/image/rtl838x.mk
index b9259401b2..9688dd93de 100644
--- a/target/linux/realtek/image/rtl838x.mk
+++ b/target/linux/realtek/image/rtl838x.mk
@@ -85,6 +85,16 @@ define Device/netgear_gs310tp-v1
 endef
 TARGET_DEVICES += netgear_gs310tp-v1
 
+define Device/panasonic_m8eg-pn28080k
+  SOC := rtl8380
+  IMAGE_SIZE := 16384k
+  DEVICE_VENDOR := Panasonic
+  DEVICE_MODEL := Switch-M8eG
+  DEVICE_VARIANT := PN28080K
+  DEVICE_PACKAGES := kmod-i2c-mux-pca954x
+endef
+TARGET_DEVICES += panasonic_m8eg-pn28080k
+
 define Device/zyxel_gs1900
   SOC := rtl8380
   IMAGE_SIZE := 6976k