openwrt/package/boot/uboot-mediatek/patches/001-mtk-0005-mips-mtmips-add-support-for-MediaTek-MT7621-SoC.patch

From e0c82f36ad5180d9582d353407ff1bf34a2734bb Mon Sep 17 00:00:00 2001
From: Weijie Gao <[email protected]>
Date: Fri, 20 May 2022 11:22:21 +0800
Subject: [PATCH 05/25] mips: mtmips: add support for MediaTek MT7621 SoC

This patch adds support for MediaTek MT7621 SoC.
All files are dedicated for u-boot.

The default build target is u-boot-mt7621.bin.

The specification of this chip:
https://www.mediatek.com/products/homenetworking/mt7621

Reviewed-by: Daniel Schwierzeck <[email protected]>
Signed-off-by: Weijie Gao <[email protected]>
---
 arch/mips/dts/mt7621-u-boot.dtsi             | 111 ++++++
 arch/mips/dts/mt7621.dtsi                    | 349 +++++++++++++++++++
 arch/mips/mach-mtmips/Kconfig                |  49 ++-
 arch/mips/mach-mtmips/Makefile               |   4 +
 arch/mips/mach-mtmips/cpu.c                  |   2 +-
 arch/mips/mach-mtmips/mt7621/Kconfig         |  95 +++++
 arch/mips/mach-mtmips/mt7621/Makefile        |  14 +
 arch/mips/mach-mtmips/mt7621/init.c          | 246 +++++++++++++
 arch/mips/mach-mtmips/mt7621/mt7621.h        | 229 ++++++++++++
 arch/mips/mach-mtmips/mt7621/serial.c        |  23 ++
 arch/mips/mach-mtmips/mt7621/spl/Makefile    |   9 +
 arch/mips/mach-mtmips/mt7621/spl/cps.c       | 153 ++++++++
 arch/mips/mach-mtmips/mt7621/spl/dram.c      | 153 ++++++++
 arch/mips/mach-mtmips/mt7621/spl/dram.h      |  39 +++
 arch/mips/mach-mtmips/mt7621/spl/launch.c    | 100 ++++++
 arch/mips/mach-mtmips/mt7621/spl/launch.h    |  52 +++
 arch/mips/mach-mtmips/mt7621/spl/launch_ll.S | 339 ++++++++++++++++++
 arch/mips/mach-mtmips/mt7621/spl/serial.c    |  24 ++
 arch/mips/mach-mtmips/mt7621/spl/spl.c       |  95 +++++
 arch/mips/mach-mtmips/mt7621/spl/start.S     | 226 ++++++++++++
 arch/mips/mach-mtmips/mt7621/sram_init.S     |  22 ++
 arch/mips/mach-mtmips/mt7621/tpl/Makefile    |   4 +
 arch/mips/mach-mtmips/mt7621/tpl/start.S     | 161 +++++++++
 arch/mips/mach-mtmips/mt7621/tpl/tpl.c       | 144 ++++++++
 include/configs/mt7621.h                     |  65 ++++
 25 files changed, 2702 insertions(+), 6 deletions(-)
 create mode 100644 arch/mips/dts/mt7621-u-boot.dtsi
 create mode 100644 arch/mips/dts/mt7621.dtsi
 create mode 100644 arch/mips/mach-mtmips/mt7621/Kconfig
 create mode 100644 arch/mips/mach-mtmips/mt7621/Makefile
 create mode 100644 arch/mips/mach-mtmips/mt7621/init.c
 create mode 100644 arch/mips/mach-mtmips/mt7621/mt7621.h
 create mode 100644 arch/mips/mach-mtmips/mt7621/serial.c
 create mode 100644 arch/mips/mach-mtmips/mt7621/spl/Makefile
 create mode 100644 arch/mips/mach-mtmips/mt7621/spl/cps.c
 create mode 100644 arch/mips/mach-mtmips/mt7621/spl/dram.c
 create mode 100644 arch/mips/mach-mtmips/mt7621/spl/dram.h
 create mode 100644 arch/mips/mach-mtmips/mt7621/spl/launch.c
 create mode 100644 arch/mips/mach-mtmips/mt7621/spl/launch.h
 create mode 100644 arch/mips/mach-mtmips/mt7621/spl/launch_ll.S
 create mode 100644 arch/mips/mach-mtmips/mt7621/spl/serial.c
 create mode 100644 arch/mips/mach-mtmips/mt7621/spl/spl.c
 create mode 100644 arch/mips/mach-mtmips/mt7621/spl/start.S
 create mode 100644 arch/mips/mach-mtmips/mt7621/sram_init.S
 create mode 100644 arch/mips/mach-mtmips/mt7621/tpl/Makefile
 create mode 100644 arch/mips/mach-mtmips/mt7621/tpl/start.S
 create mode 100644 arch/mips/mach-mtmips/mt7621/tpl/tpl.c
 create mode 100644 include/configs/mt7621.h

--- /dev/null
+++ b/arch/mips/dts/mt7621-u-boot.dtsi
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2022 MediaTek Inc. All rights reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#include <linux/stringify.h>
+
+/ {
+	binman: binman {
+		multiple-images;
+	};
+};
+
+&sysc {
+	u-boot,dm-pre-reloc;
+};
+
+&reboot {
+	u-boot,dm-pre-reloc;
+};
+
+&clkctrl {
+	u-boot,dm-pre-reloc;
+};
+
+&rstctrl {
+	u-boot,dm-pre-reloc;
+};
+
+&pinctrl {
+	u-boot,dm-pre-reloc;
+};
+
+&uart0 {
+	u-boot,dm-pre-reloc;
+};
+
+&uart1 {
+	u-boot,dm-pre-reloc;
+};
+
+&uart2 {
+	u-boot,dm-pre-reloc;
+};
+
+&binman {
+	u-boot-spl-ddr {
+		align = <4>;
+		align-size = <4>;
+		filename = "u-boot-spl-ddr.bin";
+		pad-byte = <0xff>;
+
+		u-boot-spl {
+			align-end = <4>;
+			filename = "u-boot-spl.bin";
+		};
+
+		stage_bin {
+			filename = "mt7621_stage_sram.bin";
+			type = "blob-ext";
+		};
+	};
+
+	spl-img {
+		filename = "u-boot-spl-ddr.img";
+
+		mkimage {
+#ifdef CONFIG_MT7621_BOOT_FROM_NAND
+			args = "-T", "mtk_image", "-n", "mt7621=1",
+			       "-a", __stringify(CONFIG_SPL_TEXT_BASE),
+			       "-e", __stringify(CONFIG_SPL_TEXT_BASE);
+#else
+			args = "-A", "mips", "-T", "standalone", "-O", "u-boot",
+			       "-C", "none", "-n", "MT7621 U-Boot SPL",
+			       "-a", __stringify(CONFIG_SPL_TEXT_BASE),
+			       "-e", __stringify(CONFIG_SPL_TEXT_BASE);
+#endif
+
+			blob {
+				filename = "u-boot-spl-ddr.bin";
+			};
+		};
+	};
+
+	mt7621-uboot {
+		filename = "u-boot-mt7621.bin";
+		pad-byte = <0xff>;
+
+#ifndef CONFIG_MT7621_BOOT_FROM_NAND
+		u-boot-tpl {
+			align-end = <4>;
+			filename = "u-boot-tpl.bin";
+		};
+#endif
+
+		spl {
+#ifdef CONFIG_MT7621_BOOT_FROM_NAND
+			align-end = <0x1000>;
+#endif
+			filename = "u-boot-spl-ddr.img";
+			type = "blob";
+		};
+
+		u-boot {
+			filename = "u-boot-lzma.img";
+			type = "blob";
+		};
+	};
+};
--- /dev/null
+++ b/arch/mips/dts/mt7621.dtsi
@@ -0,0 +1,349 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2022 MediaTek Inc. All rights reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#include <dt-bindings/clock/mt7621-clk.h>
+#include <dt-bindings/reset/mt7621-reset.h>
+#include <dt-bindings/phy/phy.h>
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+	compatible = "mediatek,mt7621-soc";
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu@0 {
+			device_type = "cpu";
+			compatible = "mips,mips1004Kc";
+			reg = <0>;
+		};
+
+		cpu@1 {
+			device_type = "cpu";
+			compatible = "mips,mips1004Kc";
+			reg = <1>;
+		};
+	};
+
+	clk48m: clk48m {
+		compatible = "fixed-clock";
+
+		clock-frequency = <48000000>;
+
+		#clock-cells = <0>;
+	};
+
+	clk50m: clk50m {
+		compatible = "fixed-clock";
+
+		clock-frequency = <50000000>;
+
+		#clock-cells = <0>;
+	};
+
+	sysc: sysctrl@1e000000 {
+		compatible = "mediatek,mt7621-sysc", "syscon";
+		reg = <0x1e000000 0x100>;
+
+		clkctrl: clock-controller@1e000030 {
+			compatible = "mediatek,mt7621-clk";
+			mediatek,memc = <&memc>;
+
+			#clock-cells = <1>;
+		};
+	};
+
+	rstctrl: reset-controller@1e000034 {
+		compatible = "mediatek,mtmips-reset";
+		reg = <0x1e000034 0x4>;
+		#reset-cells = <1>;
+	};
+
+	reboot: resetctl-reboot {
+		compatible = "resetctl-reboot";
+
+		resets = <&rstctrl RST_SYS>;
+		reset-names = "sysreset";
+	};
+
+	memc: memctrl@1e005000 {
+		compatible = "mediatek,mt7621-memc", "syscon";
+		reg = <0x1e005000 0x1000>;
+	};
+
+	pinctrl: pinctrl@1e000060 {
+		compatible = "mediatek,mt7621-pinctrl";
+		reg = <0x1e000048 0x30>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&state_default>;
+
+		state_default: pin_state {
+		};
+
+		uart1_pins: uart1_pins {
+			groups = "uart1";
+			function = "uart";
+		};
+
+		uart2_pins: uart2_pins {
+			groups = "uart2";
+			function = "uart";
+		};
+
+		uart3_pins: uart3_pins {
+			groups = "uart3";
+			function = "uart";
+		};
+
+		sdxc_pins: sdxc_pins {
+			groups = "sdxc";
+			function = "sdxc";
+		};
+
+		spi_pins: spi_pins {
+			groups = "spi";
+			function = "spi";
+		};
+
+		eth_pins: eth_pins {
+			mdio_pins {
+				groups = "mdio";
+				function = "mdio";
+			};
+
+			rgmii1_pins {
+				groups = "rgmii1";
+				function = "rgmii";
+			};
+
+			esw_pins {
+				groups = "esw int";
+				function = "esw int";
+			};
+
+			mdio_pconf {
+				groups = "mdio";
+				drive-strength = <2>;
+			};
+		};
+	};
+
+	watchdog: watchdog@1e000100 {
+		compatible = "mediatek,mt7621-wdt";
+		reg = <0x1e000100 0x40>;
+
+		resets = <&rstctrl RST_TIMER>;
+		reset-names = "wdt";
+
+		status = "disabled";
+	};
+
+	gpio: gpio@1e000600 {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		compatible = "mtk,mt7621-gpio";
+		reg = <0x1e000600 0x100>;
+
+		resets = <&rstctrl RST_PIO>;
+		reset-names = "pio";
+
+		gpio0: bank@0 {
+			reg = <0>;
+			compatible = "mtk,mt7621-gpio-bank";
+			gpio-controller;
+			#gpio-cells = <2>;
+		};
+
+		gpio1: bank@1 {
+			reg = <1>;
+			compatible = "mtk,mt7621-gpio-bank";
+			gpio-controller;
+			#gpio-cells = <2>;
+		};
+
+		gpio2: bank@2 {
+			reg = <2>;
+			compatible = "mtk,mt7621-gpio-bank";
+			gpio-controller;
+			#gpio-cells = <2>;
+		};
+	};
+
+	spi: spi@1e000b00 {
+		compatible = "ralink,mt7621-spi";
+		reg = <0x1e000b00 0x40>;
+
+		status = "disabled";
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&spi_pins>;
+
+		resets = <&rstctrl RST_SPI>;
+		reset-names = "spi";
+
+		clocks = <&clkctrl MT7621_CLK_SPI>;
+
+		#address-cells = <1>;
+		#size-cells = <0>;
+	};
+
+	uart0: uart1@1e000c00 {
+		compatible = "mediatek,hsuart", "ns16550a";
+		reg = <0x1e000c00 0x100>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&uart1_pins>;
+
+		clocks = <&clkctrl MT7621_CLK_UART1>;
+
+		resets = <&rstctrl RST_UART1>;
+
+		reg-shift = <2>;
+	};
+
+	uart1: uart2@1e000d00 {
+		compatible = "mediatek,hsuart", "ns16550a";
+		reg = <0x1e000d00 0x100>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&uart2_pins>;
+
+		clocks = <&clkctrl MT7621_CLK_UART2>;
+
+		resets = <&rstctrl RST_UART2>;
+
+		reg-shift = <2>;
+
+		status = "disabled";
+	};
+
+	uart2: uart3@1e000e00 {
+		compatible = "mediatek,hsuart", "ns16550a";
+		reg = <0x1e000e00 0x100>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&uart3_pins>;
+
+		clocks = <&clkctrl MT7621_CLK_UART3>;
+
+		resets = <&rstctrl RST_UART3>;
+
+		reg-shift = <2>;
+
+		status = "disabled";
+	};
+
+	eth: eth@1e100000 {
+		compatible = "mediatek,mt7621-eth";
+		reg = <0x1e100000 0x20000>;
+		mediatek,ethsys = <&sysc>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&eth_pins>;
+
+		resets = <&rstctrl RST_FE>, <&rstctrl RST_GMAC>, <&rstctrl RST_MCM>;
+		reset-names = "fe", "gmac", "mcm";
+
+		clocks = <&clkctrl MT7621_CLK_GDMA>,
+			 <&clkctrl MT7621_CLK_ETH>;
+		clock-names = "gmac", "fe";
+
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		mediatek,gmac-id = <0>;
+		phy-mode = "rgmii";
+		mediatek,switch = "mt7530";
+		mediatek,mcm;
+
+		fixed-link {
+			speed = <1000>;
+			full-duplex;
+		};
+	};
+
+	mmc: mmc@1e130000 {
+		compatible = "mediatek,mt7621-mmc";
+		reg = <0x1e130000 0x4000>;
+
+		status = "disabled";
+
+		bus-width = <4>;
+		builtin-cd = <1>;
+		r_smpl = <1>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&sdxc_pins>;
+
+		clocks = <&clk50m>, <&clkctrl MT7621_CLK_SHXC>;
+		clock-names = "source", "hclk";
+
+		resets = <&rstctrl RST_SDXC>;
+	};
+
+	ssusb: usb@1e1c0000 {
+		compatible = "mediatek,mt7621-xhci", "mediatek,mtk-xhci";
+		reg = <0x1e1c0000 0x1000>, <0x1e1d0700 0x100>;
+		reg-names = "mac", "ippc";
+
+		clocks = <&clk48m>, <&clk48m>;
+		clock-names = "sys_ck", "ref_ck";
+
+		phys = <&u2port0 PHY_TYPE_USB2>,
+		       <&u3port0 PHY_TYPE_USB3>,
+		       <&u2port1 PHY_TYPE_USB2>;
+
+		status = "disabled";
+	};
+
+	u3phy: usb-phy@1e1d0000 {
+		compatible = "mediatek,mt7621-u3phy",
+			     "mediatek,generic-tphy-v1";
+		reg = <0x1e1d0000 0x700>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+		status = "disabled";
+
+		u2port0: usb-phy@1e1d0800 {
+			reg = <0x1e1d0800 0x0100>;
+			#phy-cells = <1>;
+			clocks = <&clk48m>;
+			clock-names = "ref";
+		};
+
+		u3port0: usb-phy@1e1d0900 {
+			reg = <0x1e1d0900 0x0100>;
+			#phy-cells = <1>;
+		};
+
+		u2port1: usb-phy@1e1d1000 {
+			reg = <0x1e1d1000 0x0100>;
+			#phy-cells = <1>;
+			clocks = <&clk48m>;
+			clock-names = "ref";
+		};
+	};
+
+	i2c: i2c@1e000900 {
+		compatible = "i2c-gpio";
+
+		status = "disabled";
+
+		i2c-gpio,delay-us = <3>;
+
+		gpios = <&gpio0 3 1>, /* PIN3 as SDA */
+			<&gpio0 4 1>; /* PIN4 as CLK */
+
+		#address-cells = <1>;
+		#size-cells = <0>;
+	};
+};
--- a/arch/mips/mach-mtmips/Kconfig
+++ b/arch/mips/mach-mtmips/Kconfig
@@ -9,6 +9,7 @@ config SYS_MALLOC_F_LEN
 
 config SYS_SOC
 	default "mt7620" if SOC_MT7620
+	default "mt7621" if SOC_MT7621
 	default "mt7628" if SOC_MT7628
 
 config SYS_DCACHE_SIZE
@@ -18,25 +19,45 @@ config SYS_DCACHE_LINE_SIZE
 	default 32
 
 config SYS_ICACHE_SIZE
-	default 65536
+	default 65536 if SOC_MT7620 || SOC_MT7628
+	default 32768 if SOC_MT7621
 
 config SYS_ICACHE_LINE_SIZE
 	default 32
 
+config SYS_SCACHE_LINE_SIZE
+	default 32 if SOC_MT7621
+
 config SYS_TEXT_BASE
-	default 0x9c000000 if !SPL
-	default 0x80200000 if SPL
+	default 0x9c000000 if !SPL && !SOC_MT7621
+	default 0x80200000 if SPL || SOC_MT7621
 
 config SPL_TEXT_BASE
-	default 0x9c000000
+	default 0x9c000000 if !SOC_MT7621
+	default 0x80100000 if SOC_MT7621
+
+config SPL_SIZE_LIMIT
+	default 0x30000 if SOC_MT7621
+
+config TPL_TEXT_BASE
+	default 0xbfc00000 if SOC_MT7621
+
+config TPL_MAX_SIZE
+	default 4096 if SOC_MT7621
 
 config SPL_PAYLOAD
 	default "u-boot-lzma.img" if SPL_LZMA
 
 config BUILD_TARGET
-	default "u-boot-with-spl.bin" if SPL
+	default "u-boot-with-spl.bin" if SPL && !SOC_MT7621
+	default "u-boot-lzma.img" if SOC_MT7621
 	default "u-boot.bin"
 
+config MAX_MEM_SIZE
+	int
+	default 256 if SOC_MT7620 || SOC_MT7628
+	default 512 if SOC_MT7621
+
 choice
 	prompt "MediaTek MIPS SoC select"
 
@@ -55,6 +76,23 @@ config SOC_MT7620
 	help
 	  This supports MediaTek MT7620.
 
+config SOC_MT7621
+	bool "MT7621"
+	select MIPS_CM
+	select MIPS_L2_CACHE
+	select SYS_CACHE_SHIFT_5
+	select SYS_MIPS_CACHE_INIT_RAM_LOAD
+	select PINCTRL_MT7621
+	select MTK_SERIAL
+	select REGMAP
+	select SYSCON
+	select BINMAN
+	select SUPPORT_TPL
+	select SPL_LOADER_SUPPORT if SPL
+	select SPL_INIT_STACK_WITHOUT_MALLOC_F if SPL
+	help
+	  This supports MediaTek MT7621.
+
 config SOC_MT7628
 	bool "MT7628"
 	select SYS_CACHE_SHIFT_5
@@ -80,6 +118,7 @@ config SOC_MT7628
 endchoice
 
 source "arch/mips/mach-mtmips/mt7620/Kconfig"
+source "arch/mips/mach-mtmips/mt7621/Kconfig"
 source "arch/mips/mach-mtmips/mt7628/Kconfig"
 
 endmenu
--- a/arch/mips/mach-mtmips/Makefile
+++ b/arch/mips/mach-mtmips/Makefile
@@ -1,9 +1,13 @@
 # SPDX-License-Identifier: GPL-2.0+
 
 obj-y += cpu.o
+
+ifneq ($(CONFIG_SOC_MT7621),y)
 obj-y += ddr_init.o
 obj-y += ddr_cal.o
 obj-$(CONFIG_SPL_BUILD) += spl.o
+endif
 
 obj-$(CONFIG_SOC_MT7620) += mt7620/
+obj-$(CONFIG_SOC_MT7621) += mt7621/
 obj-$(CONFIG_SOC_MT7628) += mt7628/
--- a/arch/mips/mach-mtmips/cpu.c
+++ b/arch/mips/mach-mtmips/cpu.c
@@ -16,7 +16,7 @@ DECLARE_GLOBAL_DATA_PTR;
 
 int dram_init(void)
 {
-	gd->ram_size = get_ram_size((void *)KSEG1, SZ_256M);
+	gd->ram_size = get_ram_size((void *)KSEG1, CONFIG_MAX_MEM_SIZE << 20);
 
 	return 0;
 }
--- /dev/null
+++ b/arch/mips/mach-mtmips/mt7621/Kconfig
@@ -0,0 +1,95 @@
+
+if SOC_MT7621
+
+menu "CPU & DDR configuration"
+
+config MT7621_CPU_FREQ
+	int "CPU Frequency (MHz)"
+	range 400 1200
+	default 880
+
+choice
+	prompt "DRAM Frequency"
+	default MT7621_DRAM_FREQ_1200
+
+config MT7621_DRAM_FREQ_400
+	bool "400MHz"
+
+config MT7621_DRAM_FREQ_800
+	bool "800MHz"
+
+config MT7621_DRAM_FREQ_1066
+	bool "1066MHz"
+
+config MT7621_DRAM_FREQ_1200
+	bool "1200MHz"
+
+endchoice
+
+choice
+	prompt "DDR2 timing parameters"
+	default MT7621_DRAM_DDR2_1024M
+
+config MT7621_DRAM_DDR2_512M
+	bool "64MB"
+
+config MT7621_DRAM_DDR2_1024M
+	bool "128MB"
+
+config MT7621_DRAM_DDR2_512M_W9751G6KB_A02_1066MHZ
+	bool "W9751G6KB_A02 @ 1066MHz (64MB)"
+
+config MT7621_DRAM_DDR2_1024M_W971GG6KB25_800MHZ
+	bool "W971GG6KB25 @ 800MHz (128MB)"
+
+config MT7621_DRAM_DDR2_1024M_W971GG6KB18_1066MHZ
+	bool "W971GG6KB18 @ 1066MHz (128MB)"
+
+endchoice
+
+choice
+	prompt "DDR3 timing parameters"
+	default MT7621_DRAM_DDR3_2048M
+
+config MT7621_DRAM_DDR3_1024M
+	bool "128MB"
+
+config MT7621_DRAM_DDR3_1024M_KGD
+	bool "128MB KGD (MT7621DA)"
+
+config MT7621_DRAM_DDR3_2048M
+	bool "256MB"
+
+config MT7621_DRAM_DDR3_4096M
+	bool "512MB"
+
+endchoice
+
+endmenu
+
+config DEBUG_UART_BOARD_INIT
+	default y
+
+config MT7621_BOOT_FROM_NAND
+	bool "Boot from NAND"
+	help
+	  Select this if u-boot will boot from NAND flash. When booting from
+	  NAND, SPL will be loaded by bootrom directly and no TPL is needed.
+
+choice
+	prompt "Board select"
+
+endchoice
+
+config SYS_CONFIG_NAME
+	string "Board configuration name"
+	default "mt7621" if  BOARD_MT7621_RFB || BOARD_MT7621_NAND_RFB
+
+config SYS_BOARD
+	string "Board name"
+	default "mt7621" if  BOARD_MT7621_RFB || BOARD_MT7621_NAND_RFB
+
+config SYS_VENDOR
+	default "mediatek" if BOARD_MT7621_RFB || BOARD_MT7621_NAND_RFB
+
+endif
--- /dev/null
+++ b/arch/mips/mach-mtmips/mt7621/Makefile
@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-y += init.o
+obj-y += serial.o
+
+ifeq ($(CONFIG_SPL_BUILD),y)
+ifeq ($(CONFIG_TPL_BUILD),y)
+obj-y += tpl/
+else
+obj-y += spl/
+endif
+
+obj-y += sram_init.o
+endif
--- /dev/null
+++ b/arch/mips/mach-mtmips/mt7621/init.c
@@ -0,0 +1,246 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2022 MediaTek Inc. All rights reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#include <clk.h>
+#include <dm.h>
+#include <dm/uclass.h>
+#include <dt-bindings/clock/mt7621-clk.h>
+#include <asm/global_data.h>
+#include <linux/io.h>
+#include <linux/bitfield.h>
+#include "mt7621.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static const char *const boot_mode[(CHIP_MODE_M >> CHIP_MODE_S) + 1] = {
+	[1] = "NAND 2K+64",
+	[2] = "SPI-NOR 3-Byte Addr",
+	[3] = "SPI-NOR 4-Byte Addr",
+	[10] = "NAND 2K+128",
+	[11] = "NAND 4K+128",
+	[12] = "NAND 4K+256",
+};
+
+int print_cpuinfo(void)
+{
+	void __iomem *sysc = ioremap_nocache(SYSCTL_BASE, SYSCTL_SIZE);
+	u32 val, ver, eco, pkg, core, dram, chipmode;
+	u32 cpu_clk, ddr_clk, bus_clk, xtal_clk;
+	struct udevice *clkdev;
+	const char *bootdev;
+	struct clk clk;
+	int ret;
+
+	val = readl(sysc + SYSCTL_CHIP_REV_ID_REG);
+	ver = FIELD_GET(VER_ID_M, val);
+	eco = FIELD_GET(ECO_ID_M, val);
+	pkg = FIELD_GET(PKG_ID, val);
+	core = FIELD_GET(CPU_ID, val);
+
+	val = readl(sysc + SYSCTL_SYSCFG0_REG);
+	dram = FIELD_GET(DRAM_TYPE, val);
+	chipmode = FIELD_GET(CHIP_MODE_M, val);
+
+	bootdev = boot_mode[chipmode];
+	if (!bootdev)
+		bootdev = "Unsupported boot mode";
+
+	printf("CPU:   MediaTek MT7621%c ver %u, eco %u\n",
+	       core ? (pkg ? 'A' : 'N') : 'S', ver, eco);
+
+	printf("Boot:  DDR%u, %s\n", dram ? 2 : 3, bootdev);
+
+	ret = uclass_get_device_by_driver(UCLASS_CLK, DM_DRIVER_GET(mt7621_clk),
+					  &clkdev);
+	if (ret)
+		return ret;
+
+	clk.dev = clkdev;
+
+	clk.id = MT7621_CLK_CPU;
+	cpu_clk = clk_get_rate(&clk);
+
+	clk.id = MT7621_CLK_BUS;
+	bus_clk = clk_get_rate(&clk);
+
+	clk.id = MT7621_CLK_DDR;
+	ddr_clk = clk_get_rate(&clk);
+
+	clk.id = MT7621_CLK_XTAL;
+	xtal_clk = clk_get_rate(&clk);
+
+	/* Set final timer frequency */
+	if (cpu_clk)
+		gd->arch.timer_freq = cpu_clk / 2;
+
+	printf("Clock: CPU: %uMHz, DDR: %uMT/s, Bus: %uMHz, XTAL: %uMHz\n",
+	       cpu_clk / 1000000, ddr_clk / 500000, bus_clk / 1000000,
+	       xtal_clk / 1000000);
+
+	return 0;
+}
+
+unsigned long get_xtal_mhz(void)
+{
+	void __iomem *sysc = ioremap_nocache(SYSCTL_BASE, SYSCTL_SIZE);
+	u32 bs, xtal_sel;
+
+	bs = readl(sysc + SYSCTL_SYSCFG0_REG);
+	xtal_sel = FIELD_GET(XTAL_MODE_SEL_M, bs);
+
+	if (xtal_sel <= 2)
+		return 20;
+	else if (xtal_sel <= 5)
+		return 40;
+	else
+		return 25;
+}
+
+static void xhci_config_40mhz(void __iomem *usbh)
+{
+	writel(FIELD_PREP(SSUSB_MAC3_SYS_CK_GATE_MASK_TIME_M, 0x20) |
+	       FIELD_PREP(SSUSB_MAC2_SYS_CK_GATE_MASK_TIME_M, 0x20) |
+	       FIELD_PREP(SSUSB_MAC3_SYS_CK_GATE_MODE_M, 2) |
+	       FIELD_PREP(SSUSB_MAC2_SYS_CK_GATE_MODE_M, 2) | 0x10,
+	       usbh + SSUSB_MAC_CK_CTRL_REG);
+
+	writel(FIELD_PREP(SSUSB_PLL_PREDIV_PE1D_M, 2) |
+	       FIELD_PREP(SSUSB_PLL_PREDIV_U3_M, 1) |
+	       FIELD_PREP(SSUSB_PLL_FBKDI_M, 4),
+	       usbh + DA_SSUSB_U3PHYA_10_REG);
+
+	writel(FIELD_PREP(SSUSB_PLL_FBKDIV_PE2H_M, 0x18) |
+	       FIELD_PREP(SSUSB_PLL_FBKDIV_PE1D_M, 0x18) |
+	       FIELD_PREP(SSUSB_PLL_FBKDIV_PE1H_M, 0x18) |
+	       FIELD_PREP(SSUSB_PLL_FBKDIV_U3_M, 0x1e),
+	       usbh + DA_SSUSB_PLL_FBKDIV_REG);
+
+	writel(FIELD_PREP(SSUSB_PLL_PCW_NCPO_U3_M, 0x1e400000),
+	       usbh + DA_SSUSB_PLL_PCW_NCPO_REG);
+
+	writel(FIELD_PREP(SSUSB_PLL_SSC_DELTA1_PE1H_M, 0x25) |
+	       FIELD_PREP(SSUSB_PLL_SSC_DELTA1_U3_M, 0x73),
+	       usbh + DA_SSUSB_PLL_SSC_DELTA1_REG);
+
+	writel(FIELD_PREP(SSUSB_PLL_SSC_DELTA_U3_M, 0x71) |
+	       FIELD_PREP(SSUSB_PLL_SSC_DELTA1_PE2D_M, 0x4a),
+	       usbh + DA_SSUSB_U3PHYA_21_REG);
+
+	writel(FIELD_PREP(SSUSB_PLL_SSC_PRD_M, 0x140),
+	       usbh + SSUSB_U3PHYA_9_REG);
+
+	writel(FIELD_PREP(SSUSB_SYSPLL_PCW_NCPO_M, 0x11c00000),
+	       usbh + SSUSB_U3PHYA_3_REG);
+
+	writel(FIELD_PREP(SSUSB_PCIE_CLKDRV_AMP_M, 4) |
+	       FIELD_PREP(SSUSB_SYSPLL_FBSEL_M, 1) |
+	       FIELD_PREP(SSUSB_SYSPLL_PREDIV_M, 1),
+	       usbh + SSUSB_U3PHYA_1_REG);
+
+	writel(FIELD_PREP(SSUSB_SYSPLL_FBDIV_M, 0x12) |
+	       SSUSB_SYSPLL_VCO_DIV_SEL | SSUSB_SYSPLL_FPEN |
+	       SSUSB_SYSPLL_MONCK_EN | SSUSB_SYSPLL_VOD_EN,
+	       usbh + SSUSB_U3PHYA_2_REG);
+
+	writel(SSUSB_EQ_CURSEL | FIELD_PREP(SSUSB_RX_DAC_MUX_M, 8) |
+	       FIELD_PREP(SSUSB_PCIE_SIGDET_VTH_M, 1) |
+	       FIELD_PREP(SSUSB_PCIE_SIGDET_LPF_M, 1),
+	       usbh + SSUSB_U3PHYA_11_REG);
+
+	writel(FIELD_PREP(SSUSB_RING_OSC_CNTEND_M, 0x1ff) |
+	       FIELD_PREP(SSUSB_XTAL_OSC_CNTEND_M, 0x7f) |
+	       SSUSB_RING_BYPASS_DET,
+	       usbh + SSUSB_B2_ROSC_0_REG);
+
+	writel(FIELD_PREP(SSUSB_RING_OSC_FRC_RECAL_M, 3) |
+	       SSUSB_RING_OSC_FRC_SEL,
+	       usbh + SSUSB_B2_ROSC_1_REG);
+}
+
+static void xhci_config_25mhz(void __iomem *usbh)
+{
+	writel(FIELD_PREP(SSUSB_MAC3_SYS_CK_GATE_MASK_TIME_M, 0x20) |
+	       FIELD_PREP(SSUSB_MAC2_SYS_CK_GATE_MASK_TIME_M, 0x20) |
+	       FIELD_PREP(SSUSB_MAC3_SYS_CK_GATE_MODE_M, 2) |
+	       FIELD_PREP(SSUSB_MAC2_SYS_CK_GATE_MODE_M, 2) | 0x10,
+	       usbh + SSUSB_MAC_CK_CTRL_REG);
+
+	writel(FIELD_PREP(SSUSB_PLL_PREDIV_PE1D_M, 2) |
+	       FIELD_PREP(SSUSB_PLL_FBKDI_M, 4),
+	       usbh + DA_SSUSB_U3PHYA_10_REG);
+
+	writel(FIELD_PREP(SSUSB_PLL_FBKDIV_PE2H_M, 0x18) |
+	       FIELD_PREP(SSUSB_PLL_FBKDIV_PE1D_M, 0x18) |
+	       FIELD_PREP(SSUSB_PLL_FBKDIV_PE1H_M, 0x18) |
+	       FIELD_PREP(SSUSB_PLL_FBKDIV_U3_M, 0x19),
+	       usbh + DA_SSUSB_PLL_FBKDIV_REG);
+
+	writel(FIELD_PREP(SSUSB_PLL_PCW_NCPO_U3_M, 0x18000000),
+	       usbh + DA_SSUSB_PLL_PCW_NCPO_REG);
+
+	writel(FIELD_PREP(SSUSB_PLL_SSC_DELTA1_PE1H_M, 0x25) |
+	       FIELD_PREP(SSUSB_PLL_SSC_DELTA1_U3_M, 0x4a),
+	       usbh + DA_SSUSB_PLL_SSC_DELTA1_REG);
+
+	writel(FIELD_PREP(SSUSB_PLL_SSC_DELTA_U3_M, 0x48) |
+	       FIELD_PREP(SSUSB_PLL_SSC_DELTA1_PE2D_M, 0x4a),
+	       usbh + DA_SSUSB_U3PHYA_21_REG);
+
+	writel(FIELD_PREP(SSUSB_PLL_SSC_PRD_M, 0x190),
+	       usbh + SSUSB_U3PHYA_9_REG);
+
+	writel(FIELD_PREP(SSUSB_SYSPLL_PCW_NCPO_M, 0xe000000),
+	       usbh + SSUSB_U3PHYA_3_REG);
+
+	writel(FIELD_PREP(SSUSB_PCIE_CLKDRV_AMP_M, 4) |
+	       FIELD_PREP(SSUSB_SYSPLL_FBSEL_M, 1),
+	       usbh + SSUSB_U3PHYA_1_REG);
+
+	writel(FIELD_PREP(SSUSB_SYSPLL_FBDIV_M, 0xf) |
+	       SSUSB_SYSPLL_VCO_DIV_SEL | SSUSB_SYSPLL_FPEN |
+	       SSUSB_SYSPLL_MONCK_EN | SSUSB_SYSPLL_VOD_EN,
+	       usbh + SSUSB_U3PHYA_2_REG);
+
+	writel(SSUSB_EQ_CURSEL | FIELD_PREP(SSUSB_RX_DAC_MUX_M, 8) |
+	       FIELD_PREP(SSUSB_PCIE_SIGDET_VTH_M, 1) |
+	       FIELD_PREP(SSUSB_PCIE_SIGDET_LPF_M, 1),
+	       usbh + SSUSB_U3PHYA_11_REG);
+
+	writel(FIELD_PREP(SSUSB_RING_OSC_CNTEND_M, 0x1ff) |
+	       FIELD_PREP(SSUSB_XTAL_OSC_CNTEND_M, 0x7f) |
+	       SSUSB_RING_BYPASS_DET,
+	       usbh + SSUSB_B2_ROSC_0_REG);
+
+	writel(FIELD_PREP(SSUSB_RING_OSC_FRC_RECAL_M, 3) |
+	       SSUSB_RING_OSC_FRC_SEL,
+	       usbh + SSUSB_B2_ROSC_1_REG);
+}
+
+void lowlevel_init(void)
+{
+	void __iomem *usbh = ioremap_nocache(SSUSB_BASE, SSUSB_SIZE);
+	u32 xtal = get_xtal_mhz();
+
+	/* Setup USB xHCI */
+	if (xtal == 40)
+		xhci_config_40mhz(usbh);
+	else if (xtal == 25)
+		xhci_config_25mhz(usbh);
+}
+
+ulong notrace get_tbclk(void)
+{
+	return gd->arch.timer_freq;
+}
+
+void _machine_restart(void)
+{
+	void __iomem *sysc = ioremap_nocache(SYSCTL_BASE, SYSCTL_SIZE);
+
+	while (1)
+		writel(SYS_RST, sysc + SYSCTL_RSTCTL_REG);
+}
--- /dev/null
+++ b/arch/mips/mach-mtmips/mt7621/mt7621.h
@@ -0,0 +1,229 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2022 MediaTek Inc. All rights reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#ifndef _MT7621_H_
+#define _MT7621_H_
+
+#define SYSCTL_BASE				0x1e000000
+#define SYSCTL_SIZE				0x100
+#define TIMER_BASE				0x1e000100
+#define TIMER_SIZE				0x100
+#define RBUS_BASE				0x1e000400
+#define RBUS_SIZE				0x100
+#define GPIO_BASE				0x1e000600
+#define GPIO_SIZE				0x100
+#define DMA_CFG_ARB_BASE			0x1e000800
+#define DMA_CFG_ARB_SIZE			0x100
+#define SPI_BASE				0x1e000b00
+#define SPI_SIZE				0x100
+#define UART1_BASE				0x1e000c00
+#define UART1_SIZE				0x100
+#define UART2_BASE				0x1e000d00
+#define UART2_SIZE				0x100
+#define UART3_BASE				0x1e000e00
+#define UART3_SIZE				0x100
+#define NFI_BASE				0x1e003000
+#define NFI_SIZE				0x800
+#define NFI_ECC_BASE				0x1e003800
+#define NFI_ECC_SIZE				0x800
+#define DRAMC_BASE				0x1e005000
+#define DRAMC_SIZE				0x1000
+#define FE_BASE					0x1e100000
+#define FE_SIZE					0xe000
+#define GMAC_BASE				0x1e110000
+#define GMAC_SIZE				0x8000
+#define SSUSB_BASE				0x1e1c0000
+#define SSUSB_SIZE				0x40000
+
+ /* GIC Base Address */
+#define MIPS_GIC_BASE				0x1fbc0000
+
+ /* CPC Base Address */
+#define MIPS_CPC_BASE				0x1fbf0000
+
+ /* Flash Memory-mapped Base Address */
+#define FLASH_MMAP_BASE				0x1fc00000
+#define TPL_INFO_OFFSET				0x40
+#define TPL_INFO_MAGIC				0x31323637 /* Magic "7621" */
+
+/* SRAM */
+#define FE_SRAM_BASE1				0x8000
+#define FE_SRAM_BASE2				0xa000
+
+/* SYSCTL_BASE */
+#define SYSCTL_CHIP_REV_ID_REG			0x0c
+#define CPU_ID					0x20000
+#define PKG_ID					0x10000
+#define VER_ID_S				8
+#define VER_ID_M				0xf00
+#define ECO_ID_S				0
+#define ECO_ID_M				0x0f
+
+#define SYSCTL_SYSCFG0_REG			0x10
+#define XTAL_MODE_SEL_S				6
+#define XTAL_MODE_SEL_M				0x1c0
+#define DRAM_TYPE				0x10
+#define CHIP_MODE_S				0
+#define CHIP_MODE_M				0x0f
+
+#define BOOT_SRAM_BASE_REG			0x20
+
+#define SYSCTL_CLKCFG0_REG			0x2c
+#define CPU_CLK_SEL_S				30
+#define CPU_CLK_SEL_M				0xc0000000
+#define MPLL_CFG_SEL_S				23
+#define MPLL_CFG_SEL_M				0x800000
+
+#define SYSCTL_RSTCTL_REG			0x34
+#define MCM_RST					0x04
+#define SYS_RST					0x01
+
+#define SYSCTL_CUR_CLK_STS_REG			0x44
+#define CUR_CPU_FDIV_S				8
+#define CUR_CPU_FDIV_M				0x1f00
+#define CUR_CPU_FFRAC_S				0
+#define CUR_CPU_FFRAC_M				0x1f
+
+#define SYSCTL_GPIOMODE_REG			0x60
+#define UART2_MODE_S				5
+#define UART2_MODE_M				0x60
+#define UART3_MODE_S				3
+#define UART3_MODE_M				0x18
+#define UART1_MODE				0x02
+
+/* RBUS_BASE */
+#define RBUS_DYN_CFG0_REG			0x0010
+#define CPU_FDIV_S				8
+#define CPU_FDIV_M				0x1f00
+#define CPU_FFRAC_S				0
+#define CPU_FFRAC_M				0x1f
+
+/* DMA_CFG_ARB_BASE */
+#define DMA_ROUTE_REG				0x000c
+
+/* SPI_BASE */
+#define SPI_SPACE_REG				0x003c
+#define FS_SLAVE_SEL_S				12
+#define FS_SLAVE_SEL_M				0x70000
+#define FS_CLK_SEL_S				0
+#define FS_CLK_SEL_M				0xfff
+
+/* FE_BASE */
+#define FE_RST_GLO_REG				0x0004
+#define FE_PSE_RAM				0x04
+#define FE_PSE_MEM_EN				0x02
+#define FE_PSE_RESET				0x01
+
+/* SSUSB_BASE */
+#define SSUSB_MAC_CK_CTRL_REG			0x10784
+#define SSUSB_MAC3_SYS_CK_GATE_MASK_TIME_S	16
+#define SSUSB_MAC3_SYS_CK_GATE_MASK_TIME_M	0xff0000
+#define SSUSB_MAC2_SYS_CK_GATE_MASK_TIME_S	8
+#define SSUSB_MAC2_SYS_CK_GATE_MASK_TIME_M	0xff00
+#define SSUSB_MAC3_SYS_CK_GATE_MODE_S		2
+#define SSUSB_MAC3_SYS_CK_GATE_MODE_M		0x0c
+#define SSUSB_MAC2_SYS_CK_GATE_MODE_S		0
+#define SSUSB_MAC2_SYS_CK_GATE_MODE_M		0x03
+
+#define SSUSB_B2_ROSC_0_REG			0x10a40
+#define SSUSB_RING_OSC_CNTEND_S			23
+#define SSUSB_RING_OSC_CNTEND_M			0xff800000
+#define SSUSB_XTAL_OSC_CNTEND_S			16
+#define SSUSB_XTAL_OSC_CNTEND_M			0x7f0000
+#define SSUSB_RING_BYPASS_DET			0x01
+
+#define SSUSB_B2_ROSC_1_REG			0x10a44
+#define SSUSB_RING_OSC_FRC_RECAL_S		17
+#define SSUSB_RING_OSC_FRC_RECAL_M		0x60000
+#define SSUSB_RING_OSC_FRC_SEL			0x01
+
+#define SSUSB_U3PHYA_1_REG			0x10b04
+#define SSUSB_PCIE_CLKDRV_AMP_S			27
+#define SSUSB_PCIE_CLKDRV_AMP_M			0x38000000
+#define SSUSB_SYSPLL_FBSEL_S			2
+#define SSUSB_SYSPLL_FBSEL_M			0x0c
+#define SSUSB_SYSPLL_PREDIV_S			0
+#define SSUSB_SYSPLL_PREDIV_M			0x03
+
+#define SSUSB_U3PHYA_2_REG			0x10b08
+#define SSUSB_SYSPLL_FBDIV_S			24
+#define SSUSB_SYSPLL_FBDIV_M			0x7f000000
+#define SSUSB_SYSPLL_VCO_DIV_SEL		0x200000
+#define SSUSB_SYSPLL_FPEN			0x2000
+#define SSUSB_SYSPLL_MONCK_EN			0x1000
+#define SSUSB_SYSPLL_VOD_EN			0x200
+
+#define SSUSB_U3PHYA_3_REG			0x10b10
+#define SSUSB_SYSPLL_PCW_NCPO_S			1
+#define SSUSB_SYSPLL_PCW_NCPO_M			0xfffffffe
+
+#define SSUSB_U3PHYA_9_REG			0x10b24
+#define SSUSB_PLL_SSC_PRD_S			0
+#define SSUSB_PLL_SSC_PRD_M			0xffff
+
+#define SSUSB_U3PHYA_11_REG			0x10b2c
+#define SSUSB_EQ_CURSEL				0x1000000
+#define SSUSB_RX_DAC_MUX_S			19
+#define SSUSB_RX_DAC_MUX_M			0xf80000
+#define SSUSB_PCIE_SIGDET_VTH_S			5
+#define SSUSB_PCIE_SIGDET_VTH_M			0x60
+#define SSUSB_PCIE_SIGDET_LPF_S			3
+#define SSUSB_PCIE_SIGDET_LPF_M			0x18
+
+#define DA_SSUSB_PLL_FBKDIV_REG			0x10c1c
+#define SSUSB_PLL_FBKDIV_PE2H_S			24
+#define SSUSB_PLL_FBKDIV_PE2H_M			0x7f000000
+#define SSUSB_PLL_FBKDIV_PE1D_S			16
+#define SSUSB_PLL_FBKDIV_PE1D_M			0x7f0000
+#define SSUSB_PLL_FBKDIV_PE1H_S			8
+#define SSUSB_PLL_FBKDIV_PE1H_M			0x7f00
+#define SSUSB_PLL_FBKDIV_U3_S			0
+#define SSUSB_PLL_FBKDIV_U3_M			0x7f
+
+#define DA_SSUSB_U3PHYA_10_REG			0x10c20
+#define SSUSB_PLL_PREDIV_PE1D_S			18
+#define SSUSB_PLL_PREDIV_PE1D_M			0xc0000
+#define SSUSB_PLL_PREDIV_U3_S			8
+#define SSUSB_PLL_PREDIV_U3_M			0x300
+#define SSUSB_PLL_FBKDI_S			0
+#define SSUSB_PLL_FBKDI_M			0x07
+
+#define DA_SSUSB_PLL_PCW_NCPO_REG		0x10c24
+#define SSUSB_PLL_PCW_NCPO_U3_S			0
+#define SSUSB_PLL_PCW_NCPO_U3_M			0x7fffffff
+
+#define DA_SSUSB_PLL_SSC_DELTA1_REG		0x10c38
+#define SSUSB_PLL_SSC_DELTA1_PE1H_S		16
+#define SSUSB_PLL_SSC_DELTA1_PE1H_M		0xffff0000
+#define SSUSB_PLL_SSC_DELTA1_U3_S		0
+#define SSUSB_PLL_SSC_DELTA1_U3_M		0xffff
+
+#define DA_SSUSB_U3PHYA_21_REG			0x10c40
+#define SSUSB_PLL_SSC_DELTA_U3_S		16
+#define SSUSB_PLL_SSC_DELTA_U3_M		0xffff0000
+#define SSUSB_PLL_SSC_DELTA1_PE2D_S		0
+#define SSUSB_PLL_SSC_DELTA1_PE2D_M		0xffff
+
+/* MT7621 specific CM values */
+
+/* GCR_REGx_BASE */
+#define GCR_REG0_BASE_VALUE			0x1c000000
+#define GCR_REG1_BASE_VALUE			0x60000000
+#define GCR_REG2_BASE_VALUE			0x1c000000
+#define GCR_REG3_BASE_VALUE			0x1c000000
+
+/* GCR_REGx_MASK */
+#define GCR_REG0_MASK_VALUE			0x0000fc00 /* 64M Bus */
+#define GCR_REG1_MASK_VALUE			0x0000f000 /* 256M PCI Mem */
+#define GCR_REG2_MASK_VALUE			0x0000fc00 /* unused */
+#define GCR_REG3_MASK_VALUE			0x0000fc00 /* unused */
+
+#ifndef __ASSEMBLY__
+unsigned long get_xtal_mhz(void);
+#endif
+
+#endif /* _MT7621_H_ */
--- /dev/null
+++ b/arch/mips/mach-mtmips/mt7621/serial.c
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2022 MediaTek Inc. All rights reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#include <asm/io.h>
+#include <asm/addrspace.h>
+#include "mt7621.h"
+
+void board_debug_uart_init(void)
+{
+	void __iomem *base = ioremap_nocache(SYSCTL_BASE, SYSCTL_SIZE);
+
+#if CONFIG_DEBUG_UART_BASE == 0xbe000c00 /* KSEG1ADDR(UART1_BASE) */
+	clrbits_32(base + SYSCTL_GPIOMODE_REG, UART1_MODE);
+#elif CONFIG_DEBUG_UART_BASE == 0xbe000d00 /* KSEG1ADDR(UART2_BASE) */
+	clrbits_32(base + SYSCTL_GPIOMODE_REG, UART2_MODE_M);
+#elif CONFIG_DEBUG_UART_BASE == 0xbe000e00 /* KSEG1ADDR(UART3_BASE) */
+	clrbits_32(base + SYSCTL_GPIOMODE_REG, UART3_MODE_M);
+#endif
+}
--- /dev/null
+++ b/arch/mips/mach-mtmips/mt7621/spl/Makefile
@@ -0,0 +1,9 @@
+
+extra-y += start.o
+
+obj-y += spl.o
+obj-y += cps.o
+obj-y += dram.o
+obj-y += serial.o
+obj-y += launch.o
+obj-y += launch_ll.o
--- /dev/null
+++ b/arch/mips/mach-mtmips/mt7621/spl/cps.c
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2022 MediaTek Inc. All rights reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#include <asm/io.h>
+#include <asm/addrspace.h>
+#include <asm/mipsregs.h>
+#include <asm/cm.h>
+#include <linux/bitfield.h>
+#include "../mt7621.h"
+
+/* GIC Shared Register Bases */
+#define GIC_SH_POL_BASE		0x100
+#define GIC_SH_TRIG_BASE	0x180
+#define GIC_SH_RMASK_BASE	0x300
+#define GIC_SH_SMASK_BASE	0x380
+#define GIC_SH_MASK_BASE	0x400
+#define GIC_SH_PEND_BASE	0x480
+#define GIC_SH_MAP_PIN_BASE	0x500
+#define GIC_SH_MAP_VPE_BASE	0x2000
+
+/* GIC Registers */
+#define GIC_SH_POL31_0		(GIC_SH_POL_BASE + 0x00)
+#define GIC_SH_POL63_32		(GIC_SH_POL_BASE + 0x04)
+
+#define GIC_SH_TRIG31_0		(GIC_SH_TRIG_BASE + 0x00)
+#define GIC_SH_TRIG63_32	(GIC_SH_TRIG_BASE + 0x04)
+
+#define GIC_SH_RMASK31_0	(GIC_SH_RMASK_BASE + 0x00)
+#define GIC_SH_RMASK63_32	(GIC_SH_RMASK_BASE + 0x04)
+
+#define GIC_SH_SMASK31_0	(GIC_SH_SMASK_BASE + 0x00)
+#define GIC_SH_SMASK63_32	(GIC_SH_SMASK_BASE + 0x04)
+
+#define GIC_SH_MAP_PIN(n)	(GIC_SH_MAP_PIN_BASE + (n) * 4)
+
+#define GIC_SH_MAP_VPE(n, v)	(GIC_SH_MAP_VPE_BASE + (n) * 0x20 + ((v) / 32) * 4)
+#define GIC_SH_MAP_VPE31_0(n)	GIC_SH_MAP_VPE(n, 0)
+
+/* GIC_SH_MAP_PIN fields */
+#define GIC_MAP_TO_PIN		BIT(31)
+#define GIC_MAP_TO_NMI		BIT(30)
+#define GIC_MAP			GENMASK(5, 0)
+#define GIC_MAP_SHIFT		0
+
+static void cm_init(void __iomem *cm_base)
+{
+	u32 gcrcfg, num_cores;
+
+	gcrcfg = readl(cm_base + GCR_CONFIG);
+	num_cores = FIELD_GET(GCR_CONFIG_PCORES, gcrcfg) + 1;
+
+	writel((1 << num_cores) - 1, cm_base + GCR_ACCESS);
+
+	writel(GCR_REG0_BASE_VALUE, cm_base + GCR_REG0_BASE);
+	writel(GCR_REG1_BASE_VALUE, cm_base + GCR_REG1_BASE);
+	writel(GCR_REG2_BASE_VALUE, cm_base + GCR_REG2_BASE);
+	writel(GCR_REG3_BASE_VALUE, cm_base + GCR_REG3_BASE);
+
+	clrsetbits_32(cm_base + GCR_REG0_MASK,
+		      GCR_REGn_MASK_ADDRMASK | GCR_REGn_MASK_CMTGT,
+		      FIELD_PREP(GCR_REGn_MASK_ADDRMASK, GCR_REG0_MASK_VALUE) |
+		      GCR_REGn_MASK_CMTGT_IOCU0);
+
+	clrsetbits_32(cm_base + GCR_REG1_MASK,
+		      GCR_REGn_MASK_ADDRMASK | GCR_REGn_MASK_CMTGT,
+		      FIELD_PREP(GCR_REGn_MASK_ADDRMASK, GCR_REG1_MASK_VALUE) |
+		      GCR_REGn_MASK_CMTGT_IOCU0);
+
+	clrsetbits_32(cm_base + GCR_REG2_MASK,
+		      GCR_REGn_MASK_ADDRMASK | GCR_REGn_MASK_CMTGT,
+		      FIELD_PREP(GCR_REGn_MASK_ADDRMASK, GCR_REG2_MASK_VALUE) |
+		      GCR_REGn_MASK_CMTGT_IOCU0);
+
+	clrsetbits_32(cm_base + GCR_REG3_MASK,
+		      GCR_REGn_MASK_ADDRMASK | GCR_REGn_MASK_CMTGT,
+		      FIELD_PREP(GCR_REGn_MASK_ADDRMASK, GCR_REG3_MASK_VALUE) |
+		      GCR_REGn_MASK_CMTGT_IOCU0);
+
+	clrbits_32(cm_base + GCR_BASE, CM_DEFAULT_TARGET_MASK);
+	setbits_32(cm_base + GCR_CONTROL, GCR_CONTROL_SYNCCTL);
+}
+
+static void gic_init(void)
+{
+	void __iomem *gic_base = (void *)KSEG1ADDR(MIPS_GIC_BASE);
+	int i;
+
+	/* Interrupt 0..5: Level Trigger, Active High */
+	writel(0, gic_base + GIC_SH_TRIG31_0);
+	writel(0x3f, gic_base + GIC_SH_RMASK31_0);
+	writel(0x3f, gic_base + GIC_SH_POL31_0);
+	writel(0x3f, gic_base + GIC_SH_SMASK31_0);
+
+	/* Interrupt 56..63: Edge Trigger, Rising Edge */
+	/* Hardcoded to set up the last 8 external interrupts for IPI. */
+	writel(0xff000000, gic_base + GIC_SH_TRIG63_32);
+	writel(0xff000000, gic_base + GIC_SH_RMASK63_32);
+	writel(0xff000000, gic_base + GIC_SH_POL63_32);
+	writel(0xff000000, gic_base + GIC_SH_SMASK63_32);
+
+	/* Map interrupt source to particular hardware interrupt pin */
+	/* source {0,1,2,3,4,5} -> pin {0,0,4,3,0,5} */
+	writel(GIC_MAP_TO_PIN | 0, gic_base + GIC_SH_MAP_PIN(0));
+	writel(GIC_MAP_TO_PIN | 0, gic_base + GIC_SH_MAP_PIN(1));
+	writel(GIC_MAP_TO_PIN | 4, gic_base + GIC_SH_MAP_PIN(2));
+	writel(GIC_MAP_TO_PIN | 3, gic_base + GIC_SH_MAP_PIN(3));
+	writel(GIC_MAP_TO_PIN | 0, gic_base + GIC_SH_MAP_PIN(4));
+	writel(GIC_MAP_TO_PIN | 5, gic_base + GIC_SH_MAP_PIN(5));
+
+	/* source 56~59 -> pin 1, 60~63 -> pin 2 */
+	writel(GIC_MAP_TO_PIN | 1, gic_base + GIC_SH_MAP_PIN(56));
+	writel(GIC_MAP_TO_PIN | 1, gic_base + GIC_SH_MAP_PIN(57));
+	writel(GIC_MAP_TO_PIN | 1, gic_base + GIC_SH_MAP_PIN(58));
+	writel(GIC_MAP_TO_PIN | 1, gic_base + GIC_SH_MAP_PIN(59));
+	writel(GIC_MAP_TO_PIN | 2, gic_base + GIC_SH_MAP_PIN(60));
+	writel(GIC_MAP_TO_PIN | 2, gic_base + GIC_SH_MAP_PIN(61));
+	writel(GIC_MAP_TO_PIN | 2, gic_base + GIC_SH_MAP_PIN(62));
+	writel(GIC_MAP_TO_PIN | 2, gic_base + GIC_SH_MAP_PIN(63));
+
+	/* Interrupt map to VPE (bit mask) */
+	for (i = 0; i < 32; i++)
+		writel(BIT(0), gic_base + GIC_SH_MAP_VPE31_0(i));
+
+	/*
+	 * Direct GIC_int 56..63 to vpe 0..3
+	 * MIPS Linux convention that last 16 interrupts implemented be set
+	 * aside for IPI signaling.
+	 * The actual interrupts are tied low and software sends interrupts
+	 * via GIC_SH_WEDGE writes.
+	 */
+	for (i = 0; i < 4; i++) {
+		writel(BIT(i), gic_base + GIC_SH_MAP_VPE31_0(i + 56));
+		writel(BIT(i), gic_base + GIC_SH_MAP_VPE31_0(i + 60));
+	}
+}
+
+void mt7621_cps_init(void)
+{
+	void __iomem *cm_base = (void *)KSEG1ADDR(CONFIG_MIPS_CM_BASE);
+
+	/* Enable GIC */
+	writel(MIPS_GIC_BASE | GCR_GIC_EN, cm_base + GCR_GIC_BASE);
+
+	/* Enable CPC */
+	writel(MIPS_CPC_BASE | GCR_CPC_EN, cm_base + GCR_CPC_BASE);
+
+	gic_init();
+	cm_init(cm_base);
+}
--- /dev/null
+++ b/arch/mips/mach-mtmips/mt7621/spl/dram.c
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2022 MediaTek Inc. All rights reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#include <vsprintf.h>
+#include <asm/io.h>
+#include <asm/sections.h>
+#include <asm/byteorder.h>
+#include <asm/addrspace.h>
+#include <linux/string.h>
+#include "../mt7621.h"
+#include "dram.h"
+
+static const u32 ddr2_act[DDR_PARAM_SIZE] = {
+#if defined(CONFIG_MT7621_DRAM_DDR2_512M)
+	0xAA00AA00, 0xAA00AA00, 0x00000007, 0x22174441,
+	0x00000000, 0xF0748661, 0x40001273, 0x9F0A0481,
+	0x0304692F, 0x15602842, 0x00008888, 0x88888888,
+	0x00000000, 0x00000000, 0x00000000, 0x07100000,
+	0x00001B63, 0x00002000, 0x00004000, 0x00006000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000,
+#elif defined(CONFIG_MT7621_DRAM_DDR2_512M_W9751G6KB_A02_1066MHZ)
+	0xAA00AA00, 0xAA00AA00, 0x00000007, 0x33484584,
+	0x00000000, 0xF07486A1, 0x50001273, 0x9F010481,
+	0x0304693F, 0x15602842, 0x00008888, 0x88888888,
+	0x00000000, 0x00000000, 0x00000010, 0x07100000,
+	0x00001F73, 0x00002000, 0x00004000, 0x00006000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000,
+#elif defined(CONFIG_MT7621_DRAM_DDR2_1024M_W971GG6KB25_800MHZ)
+	0xAA00AA00, 0xAA00AA00, 0x00000007, 0x22174430,
+	0x01000000, 0xF0748661, 0x40001273, 0x9F0F0481,
+	0x0304692F, 0x15602842, 0x00008888, 0x88888888,
+	0x00000000, 0x00000000, 0x00000000, 0x07100000,
+	0x00001B63, 0x00002000, 0x00004000, 0x00006000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000,
+#elif defined(CONFIG_MT7621_DRAM_DDR2_1024M_W971GG6KB18_1066MHZ)
+	0xAA00AA00, 0xAA00AA00, 0x00000007, 0x33484584,
+	0x01000000, 0xF07486A1, 0x50001273, 0x9F070481,
+	0x0304693F, 0x15602842, 0x00008888, 0x88888888,
+	0x00000000, 0x00000000, 0x00000010, 0x07100000,
+	0x00001F73, 0x00002000, 0x00004000, 0x00006000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000,
+#else /* CONFIG_MT7621_DRAM_DDR2_1024M */
+	0xAA00AA00, 0xAA00AA00, 0x00000007, 0x22174441,
+	0x01000000, 0xF0748661, 0x40001273, 0x9F0F0481,
+	0x0304692F, 0x15602842, 0x00008888, 0x88888888,
+	0x00000000, 0x00000000, 0x00000000, 0x07100000,
+	0x00001B63, 0x00002000, 0x00004000, 0x00006000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000,
+#endif
+};
+
+static const u32 ddr3_act[DDR_PARAM_SIZE] = {
+#if defined(CONFIG_MT7621_DRAM_DDR3_1024M)
+	0xAA00AA00, 0xAA00AA00, 0x00000007, 0x44694683,
+	0x01000000, 0xF07486A1, 0xC287221D, 0x9F060481,
+	0x03046948, 0x15602842, 0x00008888, 0x88888888,
+	0x00000000, 0x00000000, 0x00000210, 0x07100000,
+	0x00001B61, 0x00002040, 0x00004010, 0x00006000,
+	0x0C000000, 0x07070000, 0x00000000, 0x00000000,
+#elif defined(CONFIG_MT7621_DRAM_DDR3_4096M)
+	0xAA00AA00, 0xAA00AA00, 0x00000007, 0x44694683,
+	0x01000000, 0xF07486A1, 0xC287221D, 0x9F0F0481,
+	0x03046948, 0x15602842, 0x00008888, 0x88888888,
+	0x00000000, 0x00000000, 0x00000240, 0x07100000,
+	0x00001B61, 0x00002040, 0x00004010, 0x00006000,
+	0x0C000000, 0x07070000, 0x00000000, 0x00000000,
+#elif defined(CONFIG_MT7621_DRAM_DDR3_1024M_KGD)
+	0xFF00FF00, 0xFF00FF00, 0x00000007, 0x44694683,
+	0x01000000, 0xF07406A1, 0xC287221D, 0x9F060481,
+	0x03046923, 0x152f2842, 0x00008888, 0x88888888,
+	0x00000000, 0x00000000, 0x00000210, 0x07100000,
+	0x00001B61, 0x00002040, 0x00004010, 0x00006000,
+	0x0C000000, 0x07070000, 0x000C0000, 0x00000000,
+#else /* CONFIG_MT7621_DRAM_DDR3_2048M */
+	0xAA00AA00, 0xAA00AA00, 0x00000007, 0x44694673,
+	0x01000000, 0xF07486A1, 0xC287221D, 0x9F050481,
+	0x03046948, 0x15602842, 0x00008888, 0x88888888,
+	0x00000000, 0x00000000, 0x00000220, 0x07100000,
+	0x00001B61, 0x00002040, 0x00004010, 0x00006000,
+	0x0C000000, 0x07070000, 0x00000000, 0x00000000,
+#endif
+};
+
+#if defined(CONFIG_MT7621_DRAM_FREQ_400)
+#define DDR_FREQ_PARAM		0x41000000
+#elif defined(CONFIG_MT7621_DRAM_FREQ_1066)
+#define DDR_FREQ_PARAM		0x21000000
+#elif defined(CONFIG_MT7621_DRAM_FREQ_1200)
+#define DDR_FREQ_PARAM		0x11000000
+#else /* CONFIG_MT7621_DRAM_FREQ_800 */
+#define DDR_FREQ_PARAM		0x31000000
+#endif
+
+#define RG_MEPL_FBDIV_S		4
+#define RG_MEPL_FBDIV_M		0x7f
+
+static inline void word_copy(u32 *dest, const u32 *src, u32 count)
+{
+	u32 i;
+
+	for (i = 0; i < count; i++)
+		dest[i] = src[i];
+}
+
+static u32 calc_cpu_pll_val(void)
+{
+	u32 div, baseval, fb;
+
+	div = get_xtal_mhz();
+
+	if (div == 40) {
+		div /= 2;
+		baseval = 0xc0005802;
+	} else {
+		baseval = 0xc0004802;
+	}
+
+	fb = CONFIG_MT7621_CPU_FREQ / div - 1;
+	if (fb > RG_MEPL_FBDIV_M)
+		fb = RG_MEPL_FBDIV_M;
+
+	return baseval | (fb << RG_MEPL_FBDIV_S);
+}
+
+void prepare_stage_bin(void)
+{
+	u32 stage_size;
+
+	const struct stage_header *stock_stage_bin =
+		(const struct stage_header *)__image_copy_end;
+
+	struct stage_header *new_stage_bin =
+		(struct stage_header *)STAGE_LOAD_ADDR;
+
+	if (be32_to_cpu(stock_stage_bin->ep) != STAGE_LOAD_ADDR)
+		panic("Invalid DDR stage binary blob\n");
+
+	stage_size = be32_to_cpu(stock_stage_bin->stage_size);
+
+	word_copy((u32 *)new_stage_bin, (const u32 *)stock_stage_bin,
+		  (stage_size + sizeof(u32) - 1) / sizeof(u32));
+
+	word_copy(new_stage_bin->ddr2_act, ddr2_act, DDR_PARAM_SIZE);
+	word_copy(new_stage_bin->ddr3_act, ddr3_act, DDR_PARAM_SIZE);
+
+	new_stage_bin->cpu_pll_cfg = calc_cpu_pll_val();
+	new_stage_bin->ddr_pll_cfg = DDR_FREQ_PARAM;
+	new_stage_bin->baudrate = CONFIG_BAUDRATE;
+}
--- /dev/null
+++ b/arch/mips/mach-mtmips/mt7621/spl/dram.h
@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2022 MediaTek Inc. All rights reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#ifndef _MT7621_DRAM_H_
+#define _MT7621_DRAM_H_
+
+#define STAGE_LOAD_ADDR			0xBE108800
+
+#ifndef __ASSEMBLY__
+#include <linux/types.h>
+
+#define DDR_PARAM_SIZE			24
+
+struct stage_header {
+	u32 jump_insn[2];
+	u32 ep;
+	u32 stage_size;
+	u32 has_stage2;
+	u32 next_ep;
+	u32 next_size;
+	u32 next_offset;
+	u32 cpu_pll_cfg;
+	u32 ddr_pll_cfg;
+	u32 reserved2[6];
+	char build_tag[32];
+	u32 ddr3_act[DDR_PARAM_SIZE];
+	u32 padding1[2];
+	u32 ddr2_act[DDR_PARAM_SIZE];
+	u32 padding2[2];
+	u32 baudrate;
+	u32 padding3;
+};
+#endif
+
+#endif /* _MT7621_DRAM_H_ */
--- /dev/null
+++ b/arch/mips/mach-mtmips/mt7621/spl/launch.c
@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2022 MediaTek Inc. All rights reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#include <asm/io.h>
+#include <asm/cm.h>
+#include <asm/sections.h>
+#include <asm/addrspace.h>
+#include <asm/mipsmtregs.h>
+#include <linux/sizes.h>
+#include <time.h>
+#include <cpu_func.h>
+#include "launch.h"
+#include "../mt7621.h"
+
+/* Cluster Power Controller (CPC) offsets */
+#define CPC_CL_OTHER			0x2010
+#define CPC_CO_CMD			0x4000
+
+/* CPC_CL_OTHER fields */
+#define CPC_CL_OTHER_CORENUM_SHIFT	16
+#define CPC_CL_OTHER_CORENUM		GENMASK(23, 16)
+
+/* CPC_CO_CMD */
+#define PWR_UP				3
+
+#define NUM_CORES			2
+#define NUM_CPUS			4
+#define WAIT_CPUS_TIMEOUT		4000
+
+static void copy_launch_wait_code(void)
+{
+	memset((void *)KSEG1, 0, SZ_4K);
+
+	memcpy((void *)KSEG1ADDR(LAUNCH_WAITCODE),
+	       &launch_wait_code_start,
+	       &launch_wait_code_end - &launch_wait_code_start);
+
+	invalidate_dcache_range(KSEG0, SZ_4K);
+}
+
+static void bootup_secondary_core(void)
+{
+	void __iomem *cpcbase = (void __iomem *)KSEG1ADDR(MIPS_CPC_BASE);
+	int i;
+
+	for (i = 1; i < NUM_CORES; i++) {
+		writel(i << CPC_CL_OTHER_CORENUM_SHIFT, cpcbase + CPC_CL_OTHER);
+		writel(PWR_UP, cpcbase + CPC_CO_CMD);
+	}
+}
+
+void secondary_cpu_init(void)
+{
+	void __iomem *sysc = (void __iomem *)KSEG1ADDR(SYSCTL_BASE);
+	u32 i, dual_core = 0, cpuready = 1, cpumask = 0x03;
+	ulong wait_tick;
+	struct cpulaunch_t *c;
+
+	/* Copy LAUNCH wait code used by other VPEs */
+	copy_launch_wait_code();
+
+	dual_core = readl(sysc + SYSCTL_CHIP_REV_ID_REG) & CPU_ID;
+
+	if (dual_core) {
+		/* Bootup secondary core for MT7621A */
+		cpumask = 0x0f;
+
+		/* Make BootROM/TPL redirect Core1's bootup flow to our entry point */
+		writel((uintptr_t)&_start, sysc + BOOT_SRAM_BASE_REG);
+
+		bootup_secondary_core();
+	}
+
+	/* Join the coherent domain */
+	join_coherent_domain(dual_core ? 2 : 1);
+
+	/* Bootup Core0/VPE1 */
+	boot_vpe1();
+
+	/* Wait for all CPU ready */
+	wait_tick = get_timer(0) + WAIT_CPUS_TIMEOUT;
+
+	while (time_before(get_timer(0), wait_tick)) {
+		/* CPU0 is obviously ready */
+		for (i = 1; i < NUM_CPUS; i++) {
+			c = (struct cpulaunch_t *)(KSEG0ADDR(CPULAUNCH) +
+						   (i << LOG2CPULAUNCH));
+
+			if (c->flags & LAUNCH_FREADY)
+				cpuready |= BIT(i);
+		}
+
+		if ((cpuready & cpumask) == cpumask)
+			break;
+	}
+}
--- /dev/null
+++ b/arch/mips/mach-mtmips/mt7621/spl/launch.h
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2022 MediaTek Inc. All rights reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#ifndef _LAUNCH_H_
+#define _LAUNCH_H_
+
+#ifndef __ASSEMBLY__
+
+struct cpulaunch_t {
+	unsigned long pc;
+	unsigned long gp;
+	unsigned long sp;
+	unsigned long a0;
+	unsigned long _pad[3]; /* pad to cache line size to avoid thrashing */
+	unsigned long flags;
+};
+
+extern char launch_wait_code_start;
+extern char launch_wait_code_end;
+
+void join_coherent_domain(int ncores);
+void boot_vpe1(void);
+
+#else
+
+#define	LAUNCH_PC		0
+#define	LAUNCH_GP		4
+#define	LAUNCH_SP		8
+#define	LAUNCH_A0		12
+#define	LAUNCH_FLAGS		28
+
+#endif
+
+#define LOG2CPULAUNCH		5
+
+#define LAUNCH_FREADY		1
+#define LAUNCH_FGO		2
+#define LAUNCH_FGONE		4
+
+#define LAUNCH_WAITCODE		0x00000d00
+#define SCRLAUNCH		0x00000e00
+#define CPULAUNCH		0x00000f00
+#define NCPULAUNCH		8
+
+/* Polling period in count cycles for secondary CPU's */
+#define LAUNCHPERIOD		10000
+
+#endif /* _LAUNCH_H_ */
--- /dev/null
+++ b/arch/mips/mach-mtmips/mt7621/spl/launch_ll.S
@@ -0,0 +1,339 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2022 MediaTek Inc. All rights reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#include <asm/cm.h>
+#include <asm/asm.h>
+#include <asm/regdef.h>
+#include <asm/cacheops.h>
+#include <asm/mipsregs.h>
+#include <asm/addrspace.h>
+#include <asm/mipsmtregs.h>
+#include "launch.h"
+
+	.macro cache_loop	curr, end, line_sz, op
+10:	cache		\op, 0(\curr)
+	PTR_ADDU	\curr, \curr, \line_sz
+	bne		\curr, \end, 10b
+	.endm
+
+	.set	mt
+
+/*
+ * Join the coherent domain
+ * a0 = number of cores
+ */
+LEAF(join_coherent_domain)
+	/*
+	 * Enable coherence and allow interventions from all other cores.
+	 * (Write access enabled via GCR_ACCESS by core 0.)
+	 */
+	li	t1, 1
+	sll	t1, a0
+	addiu	t1, -1
+
+	li	t0, KSEG1ADDR(CONFIG_MIPS_CM_BASE)
+	sw	t1, GCR_Cx_COHERENCE(t0)
+	ehb
+
+	move	t2, zero
+
+_next_coherent_core:
+	sll	t1, t2, GCR_Cx_OTHER_CORENUM_SHIFT
+	sw	t1, GCR_Cx_OTHER(t0)
+
+_busy_wait_coherent_core:
+	lw	t1, GCR_CO_COHERENCE(t0)
+	beqz	t1, _busy_wait_coherent_core
+
+	addiu	t2, 1
+	bne	t2, a0, _next_coherent_core
+
+	jr	ra
+	END(join_coherent_domain)
+
+/*
+ * All VPEs other than VPE0 will go here.
+ */
+LEAF(launch_vpe_entry)
+	mfc0	t0, CP0_EBASE
+	and	t0, t0, MIPS_EBASE_CPUNUM
+
+	/* per-VPE cpulaunch_t */
+	li	a0, KSEG0ADDR(CPULAUNCH)
+	sll	t1, t0, LOG2CPULAUNCH
+	addu	a0, t1
+
+	/* Set CPU online flag */
+	li	t0, LAUNCH_FREADY
+	sw	t0, LAUNCH_FLAGS(a0)
+
+	/* Enable count interrupt in mask, but do not enable interrupts */
+	mfc0	t0, CP0_STATUS
+	ori	t0, STATUSF_IP7
+	mtc0	t0, CP0_STATUS
+
+	/* VPEs executing in wait code do not need a stack */
+	li	t9, KSEG0ADDR(LAUNCH_WAITCODE)
+	jr	t9
+	END(launch_vpe_entry)
+
+/*
+ * This function will not be executed in place.
+ * It will be copied into memory, and VPEs other than VPE0 will be
+ * started to run into this in-memory function.
+ */
+LEAF(launch_wait_code)
+	.globl	launch_wait_code_start
+launch_wait_code_start:
+
+	move	t0, a0
+
+start_poll:
+	/* Poll CPU go flag */
+	mtc0	zero, CP0_COUNT
+	li	t1, LAUNCHPERIOD
+	mtc0	t1, CP0_COMPARE
+
+time_wait:
+	/* Software wait */
+	mfc0	t2, CP0_COUNT
+	subu	t2, t1
+	bltz	t2, time_wait
+
+	/* Check the launch flag */
+	lw	t3, LAUNCH_FLAGS(t0)
+	and	t3, LAUNCH_FGO
+	beqz	t3, start_poll
+
+	/* Reset the counter and interrupts to give naive clients a chance */
+	mfc0	t1, CP0_STATUS
+	ins	t1, zero, STATUSB_IP7, 1
+	mtc0	t1, CP0_STATUS
+
+	mfc0	t1, CP0_COUNT
+	subu	t1, 1
+	mtc0	t1, CP0_COMPARE
+
+	/* Jump to kernel */
+	lw	t9, LAUNCH_PC(t0)
+	lw	gp, LAUNCH_GP(t0)
+	lw	sp, LAUNCH_SP(t0)
+	lw	a0, LAUNCH_A0(t0)
+	move	a1, zero
+	move	a2, zero
+	move	a3, zero
+	ori	t3, LAUNCH_FGONE
+	sw	t3, LAUNCH_FLAGS(t0)
+
+	jr	t9
+
+	.globl	launch_wait_code_end
+launch_wait_code_end:
+	END(launch_wait_code)
+
+/*
+ * Core1 will go here.
+ */
+LEAF(launch_core_entry)
+	/* Disable caches */
+	bal	mips_cache_disable
+
+	/* Initialize L1 cache only */
+	li	a0, CONFIG_SYS_ICACHE_SIZE
+	li	a1, CONFIG_SYS_ICACHE_LINE_SIZE
+	li	a2, CONFIG_SYS_DCACHE_SIZE
+	li	a3, CONFIG_SYS_DCACHE_LINE_SIZE
+
+	mtc0	zero, CP0_TAGLO
+	mtc0	zero, CP0_TAGLO, 2
+	ehb
+
+	/*
+	 * Initialize the I-cache first,
+	 */
+	li		t0, KSEG0
+	addu		t1, t0, a0
+	/* clear tag to invalidate */
+	cache_loop	t0, t1, a1, INDEX_STORE_TAG_I
+#ifdef CONFIG_SYS_MIPS_CACHE_INIT_RAM_LOAD
+	/* fill once, so data field parity is correct */
+	PTR_LI		t0, KSEG0
+	cache_loop	t0, t1, a1, FILL
+	/* invalidate again - prudent but not strictly necessary */
+	PTR_LI		t0, KSEG0
+	cache_loop	t0, t1, a1, INDEX_STORE_TAG_I
+#endif
+
+	/*
+	 * then initialize D-cache.
+	 */
+	PTR_LI		t0, KSEG0
+	PTR_ADDU	t1, t0, a2
+	/* clear all tags */
+	cache_loop	t0, t1, a3, INDEX_STORE_TAG_D
+#ifdef CONFIG_SYS_MIPS_CACHE_INIT_RAM_LOAD
+	/* load from each line (in cached space) */
+	PTR_LI		t0, KSEG0
+2:	LONG_L		zero, 0(t0)
+	PTR_ADDU	t0, a3
+	 bne		t0, t1, 2b
+	/* clear all tags */
+	PTR_LI		t0, KSEG0
+	cache_loop	t0, t1, a3, INDEX_STORE_TAG_D
+#endif
+
+	/* Set Cache Mode */
+	mfc0	t0, CP0_CONFIG
+	li	t1, CONF_CM_CACHABLE_COW
+	ins	t0, t1, 0, 3
+	mtc0	t0, CP0_CONFIG
+
+	/* Join the coherent domain */
+	li	a0, 2
+	bal	join_coherent_domain
+
+	/* Bootup Core0/VPE1 */
+	bal	boot_vpe1
+
+	b	launch_vpe_entry
+	END(launch_core_entry)
+
+/*
+ * Bootup VPE1.
+ * This subroutine must be executed from VPE0 with VPECONF0[MVP] already set.
+ */
+LEAF(boot_vpe1)
+	mfc0	t0, CP0_MVPCONF0
+
+	/* a0 = number of TCs - 1 */
+	ext	a0, t0, MVPCONF0_PTC_SHIFT, 8
+	beqz	a0, _vpe1_init_done
+
+	/* a1 = number of VPEs - 1 */
+	ext	a1, t0, MVPCONF0_PVPE_SHIFT, 4
+	beqz	a1, _vpe1_init_done
+
+	/* a2 = current TC No. */
+	move	a2, zero
+
+	/* Enter VPE Configuration State */
+	mfc0	t0, CP0_MVPCONTROL
+	or	t0, MVPCONTROL_VPC
+	mtc0	t0, CP0_MVPCONTROL
+	ehb
+
+_next_tc:
+	/* Set the TC number to be used on MTTR and MFTR instructions */
+	mfc0	t0, CP0_VPECONTROL
+	ins	t0, a2, 0, 8
+	mtc0	t0, CP0_VPECONTROL
+	ehb
+
+	/* TC0 is already bound */
+	beqz	a2, _next_vpe
+
+	/* Halt current TC */
+	li	t0, TCHALT_H
+	mttc0	t0, CP0_TCHALT
+	ehb
+
+	/* If there is spare TC, bind it to the last VPE (VPE[a1]) */
+	slt	t1, a1, a2
+	bnez	t1, _vpe_bind_tc
+	 move	t1, a1
+
+	/* Set Exclusive TC for active TC */
+	mftc0	t0, CP0_VPECONF0
+	ins	t0, a2, VPECONF0_XTC_SHIFT, 8
+	mttc0	t0, CP0_VPECONF0
+
+	move	t1, a2
+_vpe_bind_tc:
+	/* Bind TC to a VPE */
+	mftc0	t0, CP0_TCBIND
+	ins	t0, t1, TCBIND_CURVPE_SHIFT, 4
+	mttc0	t0, CP0_TCBIND
+
+	/*
+	 * Set up CP0_TCSTATUS register:
+	 * Disable Coprocessor Usable bits
+	 * Disable MDMX/DSP ASE
+	 * Clear Dirty TC
+	 * not dynamically allocatable
+	 * not allocated
+	 * Kernel mode
+	 * interrupt exempt
+	 * ASID 0
+	 */
+	li	t0, TCSTATUS_IXMT
+	mttc0	t0, CP0_TCSTATUS
+
+_next_vpe:
+	slt	t1, a1, a2
+	bnez	t1, _done_vpe	# No more VPEs
+
+	/* Disable TC multi-threading */
+	mftc0	t0, CP0_VPECONTROL
+	ins	t0, zero, VPECONTROL_TE_SHIFT, 1
+	mttc0	t0, CP0_VPECONTROL
+
+	/* Skip following configuration for TC0 */
+	beqz	a2, _done_vpe
+
+	/* Deactivate VPE, set Master VPE */
+	mftc0	t0, CP0_VPECONF0
+	ins	t0, zero, VPECONF0_VPA_SHIFT, 1
+	or	t0, VPECONF0_MVP
+	mttc0	t0, CP0_VPECONF0
+
+	mfc0	t0, CP0_STATUS
+	mttc0	t0, CP0_STATUS
+
+	mttc0	zero, CP0_EPC
+	mttc0	zero, CP0_CAUSE
+
+	mfc0	t0, CP0_CONFIG
+	mttc0	t0, CP0_CONFIG
+
+	/*
+	 * VPE1 of each core can execute cached as its L1 I$ has already
+	 * been initialized.
+	 * and the L2$ has been initialized or "disabled" via CCA override.
+	 */
+	PTR_LA	t0, _start
+	mttc0	t0, CP0_TCRESTART
+
+	/* Unset Interrupt Exempt, set Activate Thread */
+	mftc0	t0, CP0_TCSTATUS
+	ins	t0, zero, TCSTATUS_IXMT_SHIFT, 1
+	ori	t0, TCSTATUS_A
+	mttc0	t0, CP0_TCSTATUS
+
+	/* Resume TC */
+	mttc0	zero, CP0_TCHALT
+
+	/* Activate VPE */
+	mftc0	t0, CP0_VPECONF0
+	ori	t0, VPECONF0_VPA
+	mttc0	t0, CP0_VPECONF0
+
+_done_vpe:
+	addu	a2, 1
+	sltu	t0, a0, a2
+	beqz	t0, _next_tc
+
+	mfc0	t0, CP0_MVPCONTROL
+	/* Enable all activated VPE to execute */
+	ori	t0, MVPCONTROL_EVP
+	/* Exit VPE Configuration State */
+	ins	t0, zero, MVPCONTROL_VPC_SHIFT, 1
+	mtc0	t0, CP0_MVPCONTROL
+	ehb
+
+_vpe1_init_done:
+	jr	ra
+	END(boot_vpe1)
--- /dev/null
+++ b/arch/mips/mach-mtmips/mt7621/spl/serial.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2022 MediaTek Inc. All rights reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#include <asm/io.h>
+#include "../mt7621.h"
+
+void mtmips_spl_serial_init(void)
+{
+#ifdef CONFIG_SPL_SERIAL
+	void __iomem *base = ioremap_nocache(SYSCTL_BASE, SYSCTL_SIZE);
+
+#if CONFIG_CONS_INDEX == 1
+	clrbits_32(base + SYSCTL_GPIOMODE_REG, UART1_MODE);
+#elif CONFIG_CONS_INDEX == 2
+	clrbits_32(base + SYSCTL_GPIOMODE_REG, UART2_MODE_M);
+#elif CONFIG_CONS_INDEX == 3
+	clrbits_32(base + SYSCTL_GPIOMODE_REG, UART3_MODE_M);
+#endif /* CONFIG_CONS_INDEX */
+#endif /* CONFIG_SPL_SERIAL */
+}
--- /dev/null
+++ b/arch/mips/mach-mtmips/mt7621/spl/spl.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2022 MediaTek Inc. All rights reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#include <spl.h>
+#include <init.h>
+#include <image.h>
+#include <vsprintf.h>
+#include <malloc.h>
+#include <asm/io.h>
+#include <asm/sections.h>
+#include <asm/addrspace.h>
+#include <asm/byteorder.h>
+#include <asm/global_data.h>
+#include <linux/sizes.h>
+#include <mach/serial.h>
+#include "../mt7621.h"
+#include "dram.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct tpl_info {
+	u32 magic;
+	u32 size;
+};
+
+void set_timer_freq_simple(void)
+{
+	u32 div = get_xtal_mhz();
+
+	/* Round down cpu freq */
+	gd->arch.timer_freq = rounddown(CONFIG_MT7621_CPU_FREQ, div) * 500000;
+}
+
+void __noreturn board_init_f(ulong dummy)
+{
+	spl_init();
+
+#ifdef CONFIG_SPL_SERIAL
+	/*
+	 * mtmips_spl_serial_init() is useful if debug uart is enabled,
+	 * or DM based serial is not enabled.
+	 */
+	mtmips_spl_serial_init();
+	preloader_console_init();
+#endif
+
+	board_init_r(NULL, 0);
+}
+
+void board_boot_order(u32 *spl_boot_list)
+{
+#ifdef CONFIG_MT7621_BOOT_FROM_NAND
+	spl_boot_list[0] = BOOT_DEVICE_NAND;
+#else
+	spl_boot_list[0] = BOOT_DEVICE_NOR;
+#endif
+}
+
+unsigned long spl_nor_get_uboot_base(void)
+{
+	const struct tpl_info *tpli;
+	const image_header_t *hdr;
+	u32 addr;
+
+	addr = FLASH_MMAP_BASE + TPL_INFO_OFFSET;
+	tpli = (const struct tpl_info *)KSEG1ADDR(addr);
+
+	if (tpli->magic == TPL_INFO_MAGIC) {
+		addr = FLASH_MMAP_BASE + tpli->size;
+		hdr = (const image_header_t *)KSEG1ADDR(addr);
+
+		if (image_get_magic(hdr) == IH_MAGIC) {
+			addr += sizeof(*hdr) + image_get_size(hdr);
+			return KSEG1ADDR(addr);
+		}
+	}
+
+	panic("Unable to locate SPL payload\n");
+	return 0;
+}
+
+uint32_t spl_nand_get_uboot_raw_page(void)
+{
+	const struct stage_header *sh = (const struct stage_header *)&_start;
+	u32 addr;
+
+	addr = image_get_header_size() + be32_to_cpu(sh->stage_size);
+	addr = ALIGN(addr, SZ_4K);
+
+	return addr;
+}
--- /dev/null
+++ b/arch/mips/mach-mtmips/mt7621/spl/start.S
@@ -0,0 +1,226 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2022 MediaTek Inc. All rights reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#include <asm-offsets.h>
+#include <config.h>
+#include <asm/asm.h>
+#include <asm/regdef.h>
+#include <asm/mipsregs.h>
+#include <asm/cacheops.h>
+#include <asm/addrspace.h>
+#include <asm/mipsmtregs.h>
+#include <asm/cm.h>
+#include "../mt7621.h"
+#include "dram.h"
+
+#ifndef CONFIG_SYS_INIT_SP_ADDR
+#define CONFIG_SYS_INIT_SP_ADDR	(CONFIG_SYS_SDRAM_BASE + \
+				CONFIG_SYS_INIT_SP_OFFSET)
+#endif
+
+#define SP_ADDR_TEMP		0xbe10dff0
+
+	.macro init_wr sel
+	MTC0	zero, CP0_WATCHLO,\sel
+	mtc0	t1, CP0_WATCHHI,\sel
+	.endm
+
+	.macro setup_stack_gd
+	li	t0, -16
+	PTR_LI	t1, CONFIG_SYS_INIT_SP_ADDR
+	and	sp, t1, t0		# force 16 byte alignment
+	PTR_SUBU \
+		sp, sp, GD_SIZE		# reserve space for gd
+	and	sp, sp, t0		# force 16 byte alignment
+	move	k0, sp			# save gd pointer
+#if CONFIG_VAL(SYS_MALLOC_F_LEN) && \
+    !CONFIG_IS_ENABLED(INIT_STACK_WITHOUT_MALLOC_F)
+	li	t2, CONFIG_VAL(SYS_MALLOC_F_LEN)
+	PTR_SUBU \
+		sp, sp, t2		# reserve space for early malloc
+	and	sp, sp, t0		# force 16 byte alignment
+#endif
+	move	fp, sp
+
+	/* Clear gd */
+	move	t0, k0
+1:
+	PTR_S	zero, 0(t0)
+	PTR_ADDIU t0, PTRSIZE
+	blt	t0, t1, 1b
+	 nop
+
+#if CONFIG_VAL(SYS_MALLOC_F_LEN) && \
+    !CONFIG_IS_ENABLED(INIT_STACK_WITHOUT_MALLOC_F)
+	PTR_S	sp, GD_MALLOC_BASE(k0)	# gd->malloc_base offset
+#endif
+	.endm
+
+	.set	noreorder
+
+ENTRY(_start)
+	b	1f
+	 mtc0	zero, CP0_COUNT
+
+	/* Stage header required by BootROM */
+	.org	0x8
+	.word	0		# ep, filled by mkimage
+	.word	0		# stage_size, filled by mkimage
+	.word	0		# has_stage2
+	.word	0		# next_ep
+	.word	0		# next_size
+	.word	0		# next_offset
+
+1:
+	/* Init CP0 Status */
+	mfc0	t0, CP0_STATUS
+	and	t0, ST0_IMPL
+	or	t0, ST0_BEV | ST0_ERL
+	mtc0	t0, CP0_STATUS
+	ehb
+
+	/* Clear Watch Status bits and disable watch exceptions */
+	li	t1, 0x7		# Clear I, R and W conditions
+	init_wr	0
+	init_wr	1
+	init_wr	2
+	init_wr	3
+
+	/* Clear WP, IV and SW interrupts */
+	mtc0	zero, CP0_CAUSE
+
+	/* Clear timer interrupt (CP0_COUNT cleared on branch to 'reset') */
+	mtc0	zero, CP0_COMPARE
+
+	/* VPE1 goes to wait code directly */
+	mfc0	t0, CP0_TCBIND
+	andi	t0, TCBIND_CURVPE
+	bnez	t0, launch_vpe_entry
+	 nop
+
+	/* Core1 goes to specific launch entry */
+	PTR_LI	t0, KSEG1ADDR(CONFIG_MIPS_CM_BASE)
+	lw	t1, GCR_Cx_ID(t0)
+	bnez	t1, launch_core_entry
+	 nop
+
+	/* MT7530 reset */
+	li	t0, KSEG1ADDR(SYSCTL_BASE)
+	lw	t1, SYSCTL_RSTCTL_REG(t0)
+	ori	t1, MCM_RST
+	sw	t1, SYSCTL_RSTCTL_REG(t0)
+
+	/* Disable DMA route for PSE SRAM set by BootROM */
+	PTR_LI	t0, KSEG1ADDR(DMA_CFG_ARB_BASE)
+	sw	zero, DMA_ROUTE_REG(t0)
+
+	/* Set CPU clock to 500MHz (Required if boot from NAND) */
+	li	t0, KSEG1ADDR(SYSCTL_BASE)
+	lw	t1, SYSCTL_CLKCFG0_REG(t0)
+	ins	t1, zero, 30, 2		# CPU_CLK_SEL
+	sw	t1, SYSCTL_CLKCFG0_REG(t0)
+
+	/* Set CPU clock divider to 1/1 */
+	li	t0, KSEG1ADDR(RBUS_BASE)
+	li	t1, 0x101
+	sw	t1, RBUS_DYN_CFG0_REG(t0)
+
+	/* (Re-)initialize the SRAM */
+	bal	mips_sram_init
+	 nop
+
+	/* Set up temporary stack */
+	li	sp, SP_ADDR_TEMP
+
+	/* Setup full CPS */
+	bal	mips_cm_map
+	 nop
+
+	bal	mt7621_cps_init
+	 nop
+
+	/* Prepare for CPU/DDR initialization binary blob */
+	bal	prepare_stage_bin
+	 nop
+
+	/* Call CPU/DDR initialization binary blob */
+	li	t9, STAGE_LOAD_ADDR
+	jalr	t9
+	 nop
+
+	/* Switch CPU PLL source */
+	li	t0, KSEG1ADDR(SYSCTL_BASE)
+	lw	t1, SYSCTL_CLKCFG0_REG(t0)
+	li	t2, 1
+	ins	t1, t2, CPU_CLK_SEL_S, 2
+	sw	t1, SYSCTL_CLKCFG0_REG(t0)
+
+	/*
+	 * Currently SPL is running on locked L2 cache (on KSEG0).
+	 * To reset the entire cache, we have to writeback SPL to DRAM first.
+	 * Cache flush won't work here. Use memcpy instead.
+	 */
+
+	la	a0, __text_start
+	move	a1, a0
+	la	a2, __image_copy_end
+	sub	a2, a2, a1
+	li	a3, 5
+	ins	a0, a3, 29, 3	# convert to KSEG1
+
+	bal	memcpy
+	 nop
+
+	/* Disable caches */
+	bal	mips_cache_disable
+	 nop
+
+	/* Reset caches */
+	bal	mips_cache_reset
+	 nop
+
+	/* Disable SRAM */
+	li	t0, KSEG1ADDR(FE_BASE)
+	li	t1, FE_PSE_RESET
+	sw	t1, FE_RST_GLO_REG(t0)
+
+	/* Clear the .bss section */
+	la	a0, __bss_start
+	la	a1, __bss_end
+1:	sw	zero, 0(a0)
+	addiu	a0, 4
+	ble	a0, a1, 1b
+	 nop
+
+	/* Set up initial stack and global data */
+	setup_stack_gd
+
+#if CONFIG_IS_ENABLED(INIT_STACK_WITHOUT_MALLOC_F)
+	/* Set malloc base */
+	li	t0, (CONFIG_SYS_INIT_SP_ADDR + 15) & (~15)
+	PTR_S	t0, GD_MALLOC_BASE(k0)	# gd->malloc_base offset
+#endif
+
+#if defined(CONFIG_DEBUG_UART) && defined(CONFIG_SPL_SERIAL)
+	/* Earliest point to set up debug uart */
+	bal	debug_uart_init
+	 nop
+#endif
+
+	/* Setup timer */
+	bal	set_timer_freq_simple
+	 nop
+
+	/* Bootup secondary CPUs */
+	bal	secondary_cpu_init
+	 nop
+
+	move	a0, zero		# a0 <-- boot_flags = 0
+	bal board_init_f
+	 move	ra, zero
+
+	END(_start)
--- /dev/null
+++ b/arch/mips/mach-mtmips/mt7621/sram_init.S
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2022 MediaTek Inc. All rights reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#include <asm/addrspace.h>
+#include <asm/asm.h>
+#include <asm/regdef.h>
+#include "mt7621.h"
+
+LEAF(mips_sram_init)
+	li	t0, KSEG1ADDR(FE_BASE)
+	li	t1, FE_PSE_RESET
+	sw	t1, FE_RST_GLO_REG(t0)
+
+	li	t1, (FE_PSE_RAM | FE_PSE_MEM_EN)
+	sw	t1, FE_RST_GLO_REG(t0)
+
+	jr	ra
+	END(mips_sram_init)
--- /dev/null
+++ b/arch/mips/mach-mtmips/mt7621/tpl/Makefile
@@ -0,0 +1,4 @@
+
+extra-y += start.o
+
+obj-y += tpl.o
--- /dev/null
+++ b/arch/mips/mach-mtmips/mt7621/tpl/start.S
@@ -0,0 +1,161 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2022 MediaTek Inc. All rights reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#include <asm-offsets.h>
+#include <config.h>
+#include <asm/asm.h>
+#include <asm/regdef.h>
+#include <asm/addrspace.h>
+#include <asm/mipsregs.h>
+#include <asm/cm.h>
+#include "../mt7621.h"
+
+#define SP_ADDR_TEMP		0xbe10dff0
+
+	.set noreorder
+
+	.macro init_wr sel
+	MTC0	zero, CP0_WATCHLO,\sel
+	mtc0	t1, CP0_WATCHHI,\sel
+	.endm
+
+	.macro uhi_mips_exception
+	move	k0, t9		# preserve t9 in k0
+	move	k1, a0		# preserve a0 in k1
+	li	t9, 15		# UHI exception operation
+	li	a0, 0		# Use hard register context
+	sdbbp	1		# Invoke UHI operation
+	.endm
+
+ENTRY(_start)
+	b	reset
+	 mtc0	zero, CP0_COUNT
+
+	/*
+	 * Store TPL size here.
+	 * This will be used by SPL to locate u-boot payload.
+	 */
+	.org	TPL_INFO_OFFSET
+	.word	TPL_INFO_MAGIC
+	.word	__image_copy_len
+
+	/* Exception vector */
+	.org 0x200
+	/* TLB refill, 32 bit task */
+	uhi_mips_exception
+
+	.org 0x280
+	/* XTLB refill, 64 bit task */
+	uhi_mips_exception
+
+	.org 0x300
+	/* Cache error exception */
+	uhi_mips_exception
+
+	.org 0x380
+	/* General exception */
+	uhi_mips_exception
+
+	.org 0x400
+	/* Catch interrupt exceptions */
+	uhi_mips_exception
+
+	.org 0x480
+	/* EJTAG debug exception */
+1:	b	1b
+	 nop
+
+	.org 0x500
+
+reset:
+	/* Set KSEG0 to Uncached */
+	mfc0	t0, CP0_CONFIG
+	ins	t0, zero, 0, 3
+	ori	t0, t0, CONF_CM_UNCACHED
+	mtc0	t0, CP0_CONFIG
+	ehb
+
+	/* Check for CPU number */
+	mfc0	t0, CP0_EBASE
+	and	t0, t0, MIPS_EBASE_CPUNUM
+	beqz	t0, 1f
+	 nop
+
+	/* Secondary core goes to specified SPL entry address */
+	li	t0, KSEG1ADDR(SYSCTL_BASE)
+	lw	t0, BOOT_SRAM_BASE_REG(t0)
+	jr	t0
+	 nop
+
+	/* Init CP0 Status */
+1:	mfc0	t0, CP0_STATUS
+	and	t0, ST0_IMPL
+	or	t0, ST0_BEV | ST0_ERL
+	mtc0	t0, CP0_STATUS
+	 nop
+
+	/* Clear Watch Status bits and disable watch exceptions */
+	li	t1, 0x7		# Clear I, R and W conditions
+	init_wr	0
+	init_wr	1
+	init_wr	2
+	init_wr	3
+
+	/* Clear WP, IV and SW interrupts */
+	mtc0	zero, CP0_CAUSE
+
+	/* Clear timer interrupt (CP0_COUNT cleared on branch to 'reset') */
+	mtc0	zero, CP0_COMPARE
+
+	/* Setup basic CPS */
+	bal	mips_cm_map
+	 nop
+
+	li	t0, KSEG1ADDR(CONFIG_MIPS_CM_BASE)
+	li	t1, GCR_REG0_BASE_VALUE
+	sw	t1, GCR_REG0_BASE(t0)
+
+	li	t1, ((GCR_REG0_MASK_VALUE << GCR_REGn_MASK_ADDRMASK_SHIFT) | \
+		    GCR_REGn_MASK_CMTGT_IOCU0)
+	sw	t1, GCR_REG0_MASK(t0)
+
+	lw	t1, GCR_BASE(t0)
+	ins	t1, zero, 0, 2		# CM_DEFAULT_TARGET
+	sw	t1, GCR_BASE(t0)
+
+	lw	t1, GCR_CONTROL(t0)
+	li	t2, GCR_CONTROL_SYNCCTL
+	or	t1, t1, t2
+	sw	t1, GCR_CONTROL(t0)
+
+	/* Increase SPI frequency */
+	li	t0, KSEG1ADDR(SPI_BASE)
+	li	t1, 5
+	sw	t1, SPI_SPACE_REG(t0)
+
+	/* Set CPU clock to 500MHz */
+	li	t0, KSEG1ADDR(SYSCTL_BASE)
+	lw	t1, SYSCTL_CLKCFG0_REG(t0)
+	ins	t1, zero, 30, 2		# CPU_CLK_SEL
+	sw	t1, SYSCTL_CLKCFG0_REG(t0)
+
+	/* Set CPU clock divider to 1/1 */
+	li	t0, KSEG1ADDR(RBUS_BASE)
+	li	t1, 0x101
+	sw	t1, RBUS_DYN_CFG0_REG(t0)
+
+	/* Initialize the SRAM */
+	bal	mips_sram_init
+	 nop
+
+	/* Set up initial stack */
+	li	sp, SP_ADDR_TEMP
+
+	bal	tpl_main
+	 nop
+
+	END(_start)
--- /dev/null
+++ b/arch/mips/mach-mtmips/mt7621/tpl/tpl.c
@@ -0,0 +1,144 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2022 MediaTek Inc. All rights reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#include <image.h>
+#include <asm/system.h>
+#include <asm/sections.h>
+#include <asm/cacheops.h>
+#include <asm/mipsregs.h>
+#include <asm/cm.h>
+
+#define INDEX_STORE_DATA_SD	0x0f
+
+typedef void __noreturn (*image_entry_noargs_t)(void);
+
+/*
+ * Lock L2 cache and fill data
+ * Assume that data is 4-byte aligned and start_addr/size is 32-byte aligned
+ */
+static void fill_lock_l2cache(uintptr_t dataptr, ulong start_addr, ulong size)
+{
+	ulong slsize = CONFIG_SYS_DCACHE_LINE_SIZE;
+	ulong end_addr = start_addr + size;
+	const u32 *data = (u32 *)dataptr;
+	ulong i, addr;
+	u32 val;
+
+	/* Clear WSC & SPR bit in ErrCtl */
+	val = read_c0_ecc();
+	val &= 0xcfffffff;
+	write_c0_ecc(val);
+	execution_hazard_barrier();
+
+	for (addr = start_addr; addr < end_addr; addr += slsize) {
+		/* Set STagLo to lock cache line */
+		write_c0_staglo((addr & 0x1ffff800) | 0xa0);
+		mips_cache(INDEX_STORE_TAG_SD, (void *)addr);
+
+		/* Fill data */
+		for (i = 0; i < slsize; i += 8) {
+			val = *data++;
+			__write_32bit_c0_register($28, 5, val); /* sdtaglo */
+			val = *data++;
+			__write_32bit_c0_register($29, 5, val); /* sdtaghi */
+			mips_cache(INDEX_STORE_DATA_SD, (void *)(addr + i));
+		}
+	}
+
+	sync();
+}
+
+/* A simple function to initialize MT7621's cache */
+static void mt7621_cache_init(void)
+{
+	void __iomem *cm_base = (void *)KSEG1ADDR(CONFIG_MIPS_CM_BASE);
+	ulong lsize = CONFIG_SYS_DCACHE_LINE_SIZE;
+	ulong addr;
+	u32 val;
+
+	/* Enable CCA override. Set to uncached */
+	val = readl(cm_base + GCR_BASE);
+	val &= ~CCA_DEFAULT_OVR_MASK;
+	val |= CCA_DEFAULT_OVREN | (2 << CCA_DEFAULT_OVR_SHIFT);
+	writel(val, cm_base + GCR_BASE);
+
+	/* Initialize L1 I-Cache */
+	write_c0_taglo(0);
+	write_c0_taghi(0);
+
+	for (addr = 0; addr < CONFIG_SYS_ICACHE_SIZE; addr += lsize)
+		mips_cache(INDEX_STORE_TAG_I, (void *)addr);
+
+	/* Initialize L1 D-Cache */
+	write_c0_dtaglo(0);
+	__write_32bit_c0_register($29, 2, 0); /* dtaghi */
+
+	for (addr = 0; addr < CONFIG_SYS_DCACHE_SIZE; addr += lsize)
+		mips_cache(INDEX_STORE_TAG_D, (void *)addr);
+
+	/* Initialize L2 Cache */
+	write_c0_staglo(0);
+	__write_32bit_c0_register($29, 4, 0); /* staghi */
+
+	for (addr = 0; addr < (256 << 10); addr += lsize)
+		mips_cache(INDEX_STORE_TAG_SD, (void *)addr);
+
+	/* Dsiable CCA override */
+	val = readl(cm_base + GCR_BASE);
+	val &= ~(CCA_DEFAULT_OVR_MASK | CCA_DEFAULT_OVREN);
+	writel(val, cm_base + GCR_BASE);
+
+	/* Set KSEG0 to non-coherent cached (important!) */
+	val = read_c0_config();
+	val &= ~CONF_CM_CMASK;
+	val |= CONF_CM_CACHABLE_NONCOHERENT;
+	write_c0_config(val);
+	execution_hazard_barrier();
+
+	/* Again, invalidate L1 D-Cache */
+	for (addr = 0; addr < CONFIG_SYS_DCACHE_SIZE; addr += lsize)
+		mips_cache(INDEX_WRITEBACK_INV_D, (void *)addr);
+
+	/* Invalidate L1 I-Cache */
+	for (addr = 0; addr < CONFIG_SYS_ICACHE_SIZE; addr += lsize)
+		mips_cache(INDEX_INVALIDATE_I, (void *)addr);
+
+	/* Disable L2 cache bypass */
+	val = read_c0_config2();
+	val &= ~MIPS_CONF_IMPL;
+	write_c0_config2(val);
+	execution_hazard_barrier();
+}
+
+void __noreturn tpl_main(void)
+{
+	const image_header_t *hdr = (const image_header_t *)__image_copy_end;
+	image_entry_noargs_t image_entry;
+	u32 loadaddr, size;
+	uintptr_t data;
+
+	/* Initialize the cache first */
+	mt7621_cache_init();
+
+	if (image_get_magic(hdr) != IH_MAGIC)
+		goto failed;
+
+	loadaddr = image_get_load(hdr);
+	size = image_get_size(hdr);
+	image_entry = (image_entry_noargs_t)image_get_ep(hdr);
+
+	/* Load TPL image to L2 cache */
+	data = (uintptr_t)__image_copy_end + sizeof(struct image_header);
+	fill_lock_l2cache(data, loadaddr, size);
+
+	/* Jump to SPL */
+	image_entry();
+
+failed:
+	for (;;)
+		;
+}
--- /dev/null
+++ b/include/configs/mt7621.h
@@ -0,0 +1,65 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2022 MediaTek Inc. All rights reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#ifndef __CONFIG_MT7621_H
+#define __CONFIG_MT7621_H
+
+#define CONFIG_SYS_MIPS_TIMER_FREQ	440000000
+
+#define CONFIG_SYS_BOOTPARAMS_LEN	0x20000
+
+#define CONFIG_SYS_SDRAM_BASE		0x80000000
+
+#define CONFIG_VERY_BIG_RAM
+#define CONFIG_MAX_MEM_MAPPED		0x1c000000
+
+#define CONFIG_SYS_INIT_SP_OFFSET	0x800000
+
+#define CONFIG_SYS_BOOTM_LEN		0x2000000
+
+#define CONFIG_SYS_MAXARGS		16
+#define CONFIG_SYS_CBSIZE		1024
+
+#define CONFIG_SYS_NONCACHED_MEMORY	0x100000
+
+/* MMC */
+#define MMC_SUPPORTS_TUNING
+
+/* NAND */
+#define CONFIG_SYS_MAX_NAND_DEVICE	1
+
+/* Serial SPL */
+#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_SERIAL)
+#define CONFIG_SYS_NS16550_MEM32
+#define CONFIG_SYS_NS16550_CLK		50000000
+#define CONFIG_SYS_NS16550_REG_SIZE	-4
+#define CONFIG_SYS_NS16550_COM1		0xbe000c00
+#endif
+
+/* Serial common */
+#define CONFIG_SYS_BAUDRATE_TABLE	{ 9600, 19200, 38400, 57600, 115200, \
+					  230400, 460800, 921600 }
+
+/* SPL */
+#define CONFIG_SYS_UBOOT_START		CONFIG_SYS_TEXT_BASE
+
+#ifdef CONFIG_TPL_BUILD
+#define CONFIG_SPL_START_S_PATH		"arch/mips/mach-mtmips/mt7621/tpl"
+/* .bss will not be used by TPL */
+#define CONFIG_SPL_BSS_START_ADDR	0x80000000
+#define CONFIG_SPL_BSS_MAX_SIZE		0
+#else
+#define CONFIG_SPL_START_S_PATH		"arch/mips/mach-mtmips/mt7621/spl"
+#define CONFIG_SPL_BSS_START_ADDR	0x80140000
+#define CONFIG_SPL_BSS_MAX_SIZE		0x80000
+#define CONFIG_SPL_MAX_SIZE		0x30000
+#endif
+
+/* Dummy value */
+#define CONFIG_SYS_UBOOT_BASE		0
+
+#endif /* __CONFIG_MT7621_H */