arm: lpc32xx: add EA LPC3250 DevKitv2 board support

Add basic support for running U-Boot on the Embedded Artists LPC3250
Developer's Kit v2 board by launching U-Boot from the board's s1l loader
(which comes pre-installed on the board).

Signed-off-by: Trevor Woerner <twoerner@gmail.com>

arch/arm/dts/Makefile

@@ -1117,6 +1117,8 @@ dtb-$(CONFIG_TARGET_PRESIDIO_ASIC) += ca-presidio-engboard.dtb
 
 dtb-$(CONFIG_TARGET_IMX8MM_CL_IOT_GATE) += imx8mm-cl-iot-gate.dtb
 
+dtb-$(CONFIG_TARGET_EA_LPC3250DEVKITV2) += lpc3250-ea3250.dtb
+
 targets += $(dtb-y)
 
 # Add any required device tree compiler flags here

arch/arm/dts/lpc3250-ea3250-u-boot.dtsi

+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2021 Trevor Woerner <twoerner@gmail.com>
+ */
+
+/{
+	model = "Embedded Artists LPC3250 DevKit v2 board based on the NXP LPC3250 SoC";
+	chosen {
+		stdout-path = &uart5;
+	};
+};
+
+&uart5 {
+	compatible = "nxp,lpc3220-uart", "ns16550a";
+};

arch/arm/mach-lpc32xx/Kconfig

@@ -12,9 +12,13 @@ config TARGET_DEVKIT3250
 config TARGET_WORK_92105
 	bool "Work Microwave Work_92105"
 
+config TARGET_EA_LPC3250DEVKITV2
+	bool "Embedded Artists LPC3250 Developer's Kit v2"
+
 endchoice
 
 source "board/timll/devkit3250/Kconfig"
 source "board/work-microwave/work_92105/Kconfig"
+source "board/ea/ea-lpc3250devkitv2/Kconfig"
 
 endif

board/ea/ea-lpc3250devkitv2/Kconfig

+if TARGET_EA_LPC3250DEVKITV2
+
+config SYS_BOARD
+	default "ea-lpc3250devkitv2"
+
+config SYS_VENDOR
+	default "ea"
+
+config SYS_SOC
+	default "lpc32xx"
+
+config SYS_CONFIG_NAME
+	default "ea-lpc3250devkitv2"
+
+endif

board/ea/ea-lpc3250devkitv2/MAINTAINERS

+EMBEDDED ARTISTS LPC3250 DEVKIT v2
+M:	Trevor Woerner <twoerner@gmail.com>
+S:	Maintained
+F:	board/ea/ea-lpc3250devkitv2
+F:	include/configs/ea-lpc3250devkitv2.h
+F:	configs/ea-lpc3250devkitv2_defconfig
+F:	arch/arm/dts/lpc32xx.dtsi
+F:	arch/arm/dts/lpc3250-ea3250.dts
+F:	arch/arm/dts/lpc3250-ea3250-u-boot.dtsi

board/ea/ea-lpc3250devkitv2/Makefile

+# SPDX-License-Identifier: GPL-2.0+
+# Copyright (C) 2021  Trevor Woerner <twoerner@gmail.com>
+
+obj-y += ea-lpc3250devkitv2.o

board/ea/ea-lpc3250devkitv2/README.rst

+.. SPDX-License-Identifier: GPL-2.0+
+
+ToC:
+- Introduction
+- Booting
+- Debugging
+
+
+Introduction
+============
+The Embedded Artists LPC3250 Developer's Kit v2 features the LPC3250 SoC
+which is based on the ARM926EJ-S CPU. The kit features a base board and
+a removable OEM board which features the SoC. Details, schematics, and
+documentation are available from the Embedded Artists product website:
+
+	https://www.embeddedartists.com/products/lpc3250-developers-kit-v2/
+
+The base board includes::
+- 200 pos, 0.6mm pitch SODIMM connector for OEM Board
+- LCD expansion connector with control signals for touch screen interface
+- Expansion connector with all OEM Board signals
+- Ethernet connector (RJ45)
+- CAN interface & connector (provision for second CAN interface, but not mounted)
+- MMC/SD interface & connector
+- USB1: OTG or Host interface & connector
+- USB2: Device or Host interface & connector
+- Provision for NXP JN5148 RF module (former Jennic) interface (RF module not included)
+- Full modem RS232 (cannot be fully used on 32-bit databus OEM boards)
+- RS422/485 interface & connector
+- Provision for IrDA transceiver interface (transceiver not mounted)
+- I2S audio codec (mic in, line in, line out, headphone out)
+- SWD/JTAG connector
+- Trace connector and pads for ETM connector
+- Serial Expansion Connector, 14-pos connector with UART/I2C/SPI/GPIO pins
+- Power supply, either via USB or external 5V DC
+- Optional coin cell battery for RTC and LED on ALARM output (coin cell not included)
+- OEM Board current measuring
+- Parallel NOR flash on external memory bus
+- 16-bit register and LEDs on external memory bus
+- 5-key joystick
+- LM75 temperature sensor (I2C connected)
+- 5 push-button keys (four via I2C and one on ISP-ENABLE)
+- 9 LEDs (8 via I2C and one on ISP-ENABLE)
+- Trimming potentiometer to analog input
+- USB-to-serial bridge on UART #0 (FT232R) and ISP functionality
+- Reset push-button and LED
+- Speaker output on analog output from OEM Board, or from I2S audio codec
+- 160x150 mm in size
+
+The OEM board::
+- ARMv5 ARM926EJ-S @ 266 MHz with hard-float VFPv2
+- 256 KByte IRAM, 64 MByte SDRAM
+- 128 MByte NAND flash
+- 4 MByte NOR Flash
+- Graphics Output: Parallel RGB
+- Hardware 2D/3D Graphic: No
+- Hardware Video: SW only
+- Graphics input: No
+- Audio: I2S
+- Ethernet: 10/100 Mbps
+- USB: 1x FS USB 2.0 OTG
+- Wi-Fi: No
+- FlexIO: No
+- Serial: 2x I2C, 2x SPI, 7x UART
+- ADC/PWM: 3 ch (10-bit) / 2 ch
+- SD: MCI
+- PCIe: No
+- Serial ATA: No
+- Size: 68 x 48 mm
+- Connector: 200 pos SODIMM
+
+
+Booting
+=======
+The processor will start its code execution from an internal ROM,
+containing the boot code. This boot loader can load code from one of four
+external sources to internal RAM (IRAM) at address 0x0::
+- UART5
+- SSP0 (in SPI mode)
+- EMC Static CS0 memory
+- NAND FLASH
+
+The ROM boot loader loads code as a single contiguous block at a maximum
+size of 56 kByte. Programs larger than this size must be loaded in more
+steps, for example, by a secondary boot loader.
+
+Kickstart Loader
+----------------
+By default the Embedded Artists LPC3250 OEM Board is programmed with the
+kickstart loader in block 0 of the NAND flash. The responsibility of this
+loader is to load an application stored in block 1 and onwards of the NAND
+flash. The kickstart loader will load the application into internal RAM
+(IRAM) at address 0x0.
+
+Stage 1 Loader (s1l)
+--------------------
+By default the Embedded Artists LPC3250 OEM Board is programmed with the
+stage 1 loader (s1l) in block 1 of the NAND flash. This application will be
+loaded by the kickstart loader when the LPC3250 OEM Board powers up. The
+S1L loader will initialize the board, such as clocks and external memory
+and then start a console where you can give input commands to the loader.
+S1L offers the following booting options::
+- MMC/SD card
+- UART5
+- NAND Flash
+
+U-Boot with kickstart+s1l
+-------------------------
+Out of the box, the easiest way to get U-Boot running on the EA LPC3250
+DevKit v2 board is to build the ea-lpc3250devkitv2_defconfig, copy the
+resulting u-boot.bin to a vfat-formatted MMC/SD card, insert the MMC/SD card
+into the MMC/SD card slot on the board, reset the board (SW1), and::
+
+	Embedded Artist 3250 Board (S1L 2.0)
+	Build date: Oct 31 2016 13:00:37
+
+	EA3250>load blk u-boot.bin raw 0x83000000
+	File loaded successfully
+
+	EA3250>exec 0x83000000
+
+
+Debugging
+=========
+JTAG debugging of the Embedded Artists LPC3250 Developer's Kit v2 board is
+easy thanks to the included/populated 20-pin JTAG port on the main board (J8).
+openocd 0.11 has been used with this board along with the ARM-USB-OCD-H JTAG
+dongle from Olimex successfully as follows:
+
+	# openocd \
+		-f interface/ftdi/olimex-arm-usb-ocd-h.cfg \
+		-f board/phytec_lpc3250.cfg

board/ea/ea-lpc3250devkitv2/ea-lpc3250devkitv2.c

+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Board init file for Embedded Artists LPC3250 DevKit v2
+ * Copyright (C) 2021  Trevor Woerner <twoerner@gmail.com>
+ */
+
+#include <init.h>
+#include <common.h>
+#include <asm/io.h>
+#include <asm/global_data.h>
+
+#include <asm/arch/clk.h>
+#include <asm/arch/wdt.h>
+#include <asm/arch/sys_proto.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int
+board_early_init_f(void)
+{
+	lpc32xx_uart_init(CONFIG_CONS_INDEX);
+	return 0;
+}
+
+int
+board_init(void)
+{
+	gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x2000;
+	return 0;
+}
+
+int
+dram_init(void)
+{
+	gd->ram_size = get_ram_size((void *)CONFIG_SYS_SDRAM_BASE, SZ_64M);
+	return 0;
+}

configs/ea-lpc3250devkitv2_defconfig

+CONFIG_ARM=y
+CONFIG_SYS_ICACHE_OFF=y
+CONFIG_SYS_DCACHE_OFF=y
+CONFIG_ARCH_CPU_INIT=y
+CONFIG_ARCH_LPC32XX=y
+CONFIG_SYS_TEXT_BASE=0x83000000
+CONFIG_NR_DRAM_BANKS=1
+CONFIG_TARGET_EA_LPC3250DEVKITV2=y
+CONFIG_DEFAULT_DEVICE_TREE="lpc3250-ea3250"
+CONFIG_DISTRO_DEFAULTS=y
+# CONFIG_ARCH_FIXUP_FDT_MEMORY is not set
+# CONFIG_AUTOBOOT is not set
+# CONFIG_USE_BOOTCOMMAND is not set
+CONFIG_BOARD_EARLY_INIT_F=y
+CONFIG_SYS_PROMPT="EA-LPC3250v2=> "
+CONFIG_CMD_GPIO=y
+CONFIG_OF_CONTROL=y
+# CONFIG_NET is not set
+CONFIG_LPC32XX_GPIO=y
+CONFIG_SPECIFY_CONSOLE_INDEX=y
+CONFIG_CONS_INDEX=5
+CONFIG_SYS_NS16550=y
+CONFIG_PANIC_HANG=y

include/configs/ea-lpc3250devkitv2.h

+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Embedded Artists LPC3250 DevKit v2
+ * Copyright (C) 2021  Trevor Woerner <twoerner@gmail.com>
+ */
+
+#ifndef __CONFIG_EA_LPC3250DEVKITV2_H__
+#define __CONFIG_EA_LPC3250DEVKITV2_H__
+
+#include <linux/sizes.h>
+#include <asm/arch/cpu.h>
+
+/*
+ * SoC and board defines
+ */
+#define CONFIG_MACH_TYPE MACH_TYPE_LPC3XXX
+#define CONFIG_SKIP_LOWLEVEL_INIT
+#define CONFIG_BOARD_SIZE_LIMIT 0x000fffff /* maximum allowable size for full U-Boot binary */
+
+/*
+ * RAM
+ */
+#define CONFIG_SYS_MALLOC_LEN SZ_4M
+#define CONFIG_SYS_SDRAM_BASE EMC_DYCS0_BASE
+
+/*
+ * cmd
+ */
+#define CONFIG_SYS_LOAD_ADDR 0x80100000
+#define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_SDRAM_BASE + SZ_4K - GENERATED_GBL_DATA_SIZE)
+
+/*
+ * SoC-specific config
+ */
+#include <asm/arch/config.h>
+
+#endif