uboot-ath79: add support for NEC Aterm series based on AR9344

Add support for NEC Aterm series devices based on Atheros AR9344.
The following devices have almost the same hardware, so the same U-Boot
binary can be used for them.

- NEC Aterm WR8750N
- NEC Aterm WR9500N
- NEC Aterm WG600HP

By the way, on NetBSD-based NEC Aterm devices, only 0x20000 (128KiB) is
available for a bootloader on the flash chip and that limitation is too
small for mainline U-Boot with the default options. So many
features/commands not required for booting OpenWrt and recoverying are
disabled on that devices, like the followings.

- networking support
- FIT support
- all decompression methods support

etc...

Signed-off-by: INAGAKI Hiroshi <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/15432
Signed-off-by: Hauke Mehrtens <[email protected]>

package/boot/uboot-ath79/Makefile

@@ -18,6 +18,15 @@ define U-Boot/Default
   HIDDEN:=1
 endef
 
+define U-Boot/ar9344_nec_aterm
+  NAME:=NEC Aterm series (AR9344)
+  BUILD_SUBTARGET:= tiny
+  BUILD_DEVICES:=nec_wg600hp nec_wr8750n nec_wr9500n
+  UBOOT_CONFIG:=nec_ar9344_aterm
+endef
+
+UBOOT_TARGETS := ar9344_nec_aterm
+
 # don't stage files to bindir, let target/linux/ath79/image/*.mk do that
 define Package/u-boot/install
 endef

package/boot/uboot-ath79/patches/400-ath79-add-support-for-NEC-AR9344-Aterm-series.patch

@@ -0,0 +1,287 @@
+From 80a7688c478a6a372083c29ff0b1826db4dae5b2 Mon Sep 17 00:00:00 2001
+From: INAGAKI Hiroshi <[email protected]>
+Date: Wed, 24 Apr 2024 23:54:46 +0900
+Subject: [PATCH] ath79: add support for NEC AR9344 Aterm series
+
+---
+ arch/mips/dts/Makefile                |  1 +
+ arch/mips/dts/nec,ar9344-aterm.dts    | 35 +++++++++++++++
+ arch/mips/mach-ath79/Kconfig          |  5 +++
+ board/nec/ar9344_aterm/Kconfig        | 30 +++++++++++++
+ board/nec/ar9344_aterm/Makefile       |  3 ++
+ board/nec/ar9344_aterm/ar9344_aterm.c | 59 ++++++++++++++++++++++++++
+ configs/nec_ar9344_aterm_defconfig    | 61 +++++++++++++++++++++++++++
+ include/configs/nec_ar9344_aterm.h    | 28 ++++++++++++
+ 8 files changed, 222 insertions(+)
+ create mode 100644 arch/mips/dts/nec,ar9344-aterm.dts
+ create mode 100644 board/nec/ar9344_aterm/Kconfig
+ create mode 100644 board/nec/ar9344_aterm/Makefile
+ create mode 100644 board/nec/ar9344_aterm/ar9344_aterm.c
+ create mode 100644 configs/nec_ar9344_aterm_defconfig
+ create mode 100644 include/configs/nec_ar9344_aterm.h
+
+--- a/arch/mips/dts/Makefile
++++ b/arch/mips/dts/Makefile
+@@ -24,6 +24,7 @@ dtb-$(CONFIG_BOARD_GARDENA_SMART_GATEWAY
+ dtb-$(CONFIG_BOARD_LINKIT_SMART_7688) += linkit-smart-7688.dtb
+ dtb-$(CONFIG_TARGET_OCTEON_EBB7304) += mrvl,octeon-ebb7304.dtb
+ dtb-$(CONFIG_TARGET_OCTEON_NIC23) += mrvl,octeon-nic23.dtb
++dtb-$(CONFIG_BOARD_NEC_AR9344_ATERM) += nec,ar9344-aterm.dtb
+ dtb-$(CONFIG_BOARD_NETGEAR_CG3100D) += netgear,cg3100d.dtb
+ dtb-$(CONFIG_BOARD_NETGEAR_DGND3700V2) += netgear,dgnd3700v2.dtb
+ dtb-$(CONFIG_BOARD_SAGEM_FAST1704) += sagem,[email protected]
+--- /dev/null
++++ b/arch/mips/dts/nec,ar9344-aterm.dts
+@@ -0,0 +1,35 @@
++// SPDX-License-Identifier: GPL-2.0+
++/*
++ * Copyright (C) 2024 INAGAKI Hiroshi <[email protected]>
++ */
++
++/dts-v1/;
++#include "ar934x.dtsi"
++
++/ {
++	model = "NEC Aterm series (AR9344)";
++	compatible = "nec,ar9344-aterm", "qca,ar934x";
++
++	aliases {
++		serial0 = &uart0;
++	};
++
++	chosen {
++		stdout-path = "serial0:9600n8";
++	};
++};
++
++&uart0 {
++	clock-frequency = <40000000>;
++	status = "okay";
++};
++
++&xtal {
++	clock-frequency = <40000000>;
++};
++
++/* delete unused nodes to reduce dtb size */
++/delete-node/ &ehci0;
++/delete-node/ &gmac0;
++/delete-node/ &gmac1;
++/delete-node/ &spi0;
+--- a/arch/mips/mach-ath79/Kconfig
++++ b/arch/mips/mach-ath79/Kconfig
+@@ -58,6 +58,10 @@ config TARGET_AP152
+ 	bool "AP152 Reference Board"
+ 	select SOC_QCA956X
+ 
++config BOARD_NEC_AR9344_ATERM
++	bool "NEC Aterm series Boards (AR9344)"
++	select SOC_AR934X
++
+ config BOARD_TPLINK_WDR4300
+ 	bool "TP-Link WDR4300 Board"
+ 	select SOC_AR934X
+@@ -67,6 +71,7 @@ endchoice
+ source "board/qca/ap121/Kconfig"
+ source "board/qca/ap143/Kconfig"
+ source "board/qca/ap152/Kconfig"
++source "board/nec/ar9344_aterm/Kconfig"
+ source "board/tplink/wdr4300/Kconfig"
+ 
+ endmenu
+--- /dev/null
++++ b/board/nec/ar9344_aterm/Kconfig
+@@ -0,0 +1,30 @@
++if BOARD_NEC_AR9344_ATERM
++
++config SYS_VENDOR
++	default "nec"
++
++config SYS_SOC
++	default "ath79"
++
++config SYS_BOARD
++	default "ar9344_aterm"
++
++config SYS_CONFIG_NAME
++	default "nec_ar9344_aterm"
++
++config TEXT_BASE
++	default 0x9f000000
++
++config SYS_DCACHE_SIZE
++	default 32768
++
++config SYS_DCACHE_LINE_SIZE
++	default 32
++
++config SYS_ICACHE_SIZE
++	default 65536
++
++config SYS_ICACHE_LINE_SIZE
++	default 32
++
++endif
+--- /dev/null
++++ b/board/nec/ar9344_aterm/Makefile
+@@ -0,0 +1,3 @@
++# SPDX-License-Identifier: GPL-2.0+
++
++obj-y	= ar9344_aterm.o
+--- /dev/null
++++ b/board/nec/ar9344_aterm/ar9344_aterm.c
+@@ -0,0 +1,59 @@
++// SPDX-License-Identifier: GPL-2.0+
++/*
++ * Copyright (C) 2024 INAGAKI Hiroshi <[email protected]>
++ */
++
++#include <init.h>
++#include <asm/io.h>
++#include <asm/addrspace.h>
++#include <asm/types.h>
++#include <mach/ath79.h>
++#include <mach/ar71xx_regs.h>
++#include <mach/ddr.h>
++#include <debug_uart.h>
++
++static void aterm_pinmux_config(void)
++{
++	void __iomem *regs;
++
++	regs = map_physmem(AR71XX_GPIO_BASE, AR71XX_GPIO_SIZE,
++			   MAP_NOCACHE);
++
++	/* Disable JTAG */
++	writel(0x2, regs + AR934X_GPIO_REG_FUNC);
++
++	/* Configure default GPIO OE/SET regs */
++	writel(0x3db1f, regs + AR71XX_GPIO_REG_OE);
++	writel(0x142000, regs + AR71XX_GPIO_REG_SET);
++
++	/* Configure pin multiplexing */
++	writel(0x00000000, regs + AR934X_GPIO_REG_OUT_FUNC0);
++	writel(0x0b0a0900, regs + AR934X_GPIO_REG_OUT_FUNC1);
++	writel(0x00180000, regs + AR934X_GPIO_REG_OUT_FUNC2);
++	writel(0x00000000, regs + AR934X_GPIO_REG_OUT_FUNC3);
++	writel(0x2f2e0000, regs + AR934X_GPIO_REG_OUT_FUNC4);
++	writel(0x00000000, regs + AR934X_GPIO_REG_OUT_FUNC5);
++}
++
++#ifdef CONFIG_DEBUG_UART_BOARD_INIT
++void board_debug_uart_init(void)
++{
++	aterm_pinmux_config();
++}
++#endif
++
++#ifdef CONFIG_BOARD_EARLY_INIT_F
++int board_early_init_f(void)
++{
++#ifndef CONFIG_DEBUG_UART_BOARD_INIT
++	aterm_pinmux_config();
++#endif
++
++#if !CONFIG_IS_ENABLED(SKIP_LOWLEVEL_INIT)
++	ar934x_pll_init(560, 480, 240);
++	ar934x_ddr_init(560, 480, 240);
++#endif
++
++	return 0;
++}
++#endif
+--- /dev/null
++++ b/configs/nec_ar9344_aterm_defconfig
+@@ -0,0 +1,61 @@
++CONFIG_MIPS=y
++CONFIG_SYS_MALLOC_LEN=0x40000
++CONFIG_HAS_CUSTOM_SYS_INIT_SP_ADDR=y
++CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0xbd007fff
++CONFIG_ENV_SIZE=0x1000
++CONFIG_DEFAULT_DEVICE_TREE="nec,ar9344-aterm"
++CONFIG_SYS_LOAD_ADDR=0x83000000
++CONFIG_ARCH_ATH79=y
++CONFIG_BOARD_NEC_AR9344_ATERM=y
++CONFIG_SYS_MIPS_TIMER_FREQ=280000000
++CONFIG_MIPS_RELOCATION_TABLE_SIZE=0x4000
++# CONFIG_LOCALVERSION_AUTO is not set
++CONFIG_TIMESTAMP=y
++CONFIG_BOOTDELAY=3
++# CONFIG_ARCH_FIXUP_FDT_MEMORY is not set
++CONFIG_USE_BOOTARGS=y
++CONFIG_BOOTARGS="console=ttyS0,115200"
++CONFIG_USE_BOOTCOMMAND=y
++CONFIG_BOOTCOMMAND="bootm 0x9f040000"
++# CONFIG_DISPLAY_BOARDINFO is not set
++CONFIG_BOARD_EARLY_INIT_F=y
++CONFIG_SYS_MALLOC_BOOTPARAMS=y
++# CONFIG_CMDLINE_EDITING is not set
++# CONFIG_AUTO_COMPLETE is not set
++# CONFIG_SYS_LONGHELP is not set
++CONFIG_SYS_MAXARGS=32
++# CONFIG_SYS_XTRACE is not set
++# CONFIG_CMD_BDI is not set
++# CONFIG_CMD_CONSOLE is not set
++# CONFIG_BOOTM_PLAN9 is not set
++# CONFIG_BOOTM_RTEMS is not set
++# CONFIG_BOOTM_VXWORKS is not set
++# CONFIG_CMD_ELF is not set
++# CONFIG_CMD_FDT is not set
++# CONFIG_CMD_RUN is not set
++# CONFIG_CMD_XIMG is not set
++# CONFIG_CMD_EXPORTENV is not set
++# CONFIG_CMD_IMPORTENV is not set
++# CONFIG_CMD_EDITENV is not set
++# CONFIG_CMD_SAVEENV is not set
++# CONFIG_CMD_ENV_EXISTS is not set
++# CONFIG_CMD_CRC32 is not set
++# CONFIG_CMD_DM is not set
++# CONFIG_CMD_LOADS is not set
++# CONFIG_CMD_ECHO is not set
++# CONFIG_CMD_ITEST is not set
++# CONFIG_CMD_SOURCE is not set
++# CONFIG_CMD_SETEXPR is not set
++# CONFIG_CMD_SLEEP is not set
++# CONFIG_ISO_PARTITION is not set
++# CONFIG_OF_TAG_MIGRATE is not set
++CONFIG_SYS_RELOC_GD_ENV_ADDR=y
++# CONFIG_NET is not set
++CONFIG_CLK=y
++# CONFIG_GPIO is not set
++# CONFIG_I2C is not set
++# CONFIG_INPUT is not set
++# CONFIG_POWER is not set
++CONFIG_DM_SERIAL=y
++CONFIG_SYS_NS16550=y
++# CONFIG_GZIP is not set
+--- /dev/null
++++ b/include/configs/nec_ar9344_aterm.h
+@@ -0,0 +1,28 @@
++/* SPDX-License-Identifier: GPL-2.0+ */
++/*
++ * Copyright (C) 2024 INAGAKI Hiroshi <[email protected]>
++ */
++
++#ifndef __NEC_AR9344_ATERM_H
++#define __NEC_AR9344_ATERM_H
++
++#define CFG_SYS_SDRAM_BASE		0x80000000
++
++#define CFG_SYS_INIT_RAM_ADDR	0xbd000000
++#define CFG_SYS_INIT_RAM_SIZE	0x8000
++
++/*
++ * Serial Port
++ */
++#define CFG_SYS_NS16550_CLK		40000000
++
++/*
++ * Command
++ */
++/* Miscellaneous configurable options */
++
++/*
++ * Diagnostics
++ */
++
++#endif  /* __NEC_AR9344_ATERM_H */