ARM: meson: Add Khadas VIM2 board support

This adds platform code for the Khadas VIM2 board based on a
Meson GXM (S912) SoC with the Meson GXM configuration.

This initial submission supports UART, MMC/SDCard and Ethernet.
USB is partially supported.

All the code is from Neil Armstrong! I just rebased the code, do
some cleanup and tested on my board.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Loic Devulder <ldevulder@suse.de>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>

board/amlogic/khadas-vim2/Kconfig

@@ -0,0 +1,12 @@
+if TARGET_KHADAS_VIM2
+
+config SYS_BOARD
+	default "khadas-vim2"
+
+config SYS_VENDOR
+	default "amlogic"
+
+config SYS_CONFIG_NAME
+	default "khadas-vim2"
+
+endif

board/amlogic/khadas-vim2/MAINTAINERS

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+KHADAS-VIM2
+M:	Neil Armstrong <narmstrong@baylibre.com>
+S:	Maintained
+F:	board/amlogic/khadas-vim2/
+F:	include/configs/khadas-vim2.h
+F:	configs/khadas-vim2_defconfig

board/amlogic/khadas-vim2/Makefile

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+# SPDX-License-Identifier: GPL-2.0+
+#
+# (C) Copyright 2016 BayLibre, SAS
+# Author: Neil Armstrong <narmstrong@baylibre.com>
+
+obj-y	:= khadas-vim2.o

board/amlogic/khadas-vim2/README

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+U-Boot for Khadas VIM2
+=======================
+
+Khadas VIM2 is an Open Source DIY Box manufactured by Shenzhen Wesion
+Technology Co., Ltd with the following specifications:
+
+ - Amlogic S912 ARM Cortex-A53 octo-core SoC @ 1.5GHz
+ - ARM Mali T860 GPU
+ - 2/3GB DDR4 SDRAM
+ - 10/100/1000 Ethernet
+ - HDMI 2.0 4K/60Hz display
+ - 40-pin GPIO header
+ - 2 x USB 2.0 Host, 1 x USB 2.0 Type-C OTG
+ - 16GB/32GB/64GB eMMC
+ - 2MB SPI Flash
+ - microSD
+ - SDIO Wifi Module, Bluetooth
+ - Two channels IR receiver
+
+Currently the u-boot port supports the following devices:
+ - serial
+ - eMMC, microSD
+ - Ethernet
+ - I2C
+ - Regulators
+ - Reset controller
+ - Clock controller
+ - USB Host
+ - ADC
+
+U-Boot compilation
+==================
+
+ > export ARCH=arm
+ > export CROSS_COMPILE=aarch64-none-elf-
+ > make khadas-vim2_defconfig
+ > make
+
+Image creation
+==============
+
+Amlogic doesn't provide sources for the firmware and for tools needed
+to create the bootloader image, so it is necessary to obtain them from
+the git tree published by the board vendor:
+
+ > wget https://releases.linaro.org/archive/13.11/components/toolchain/binaries/gcc-linaro-aarch64-none-elf-4.8-2013.11_linux.tar.xz
+ > wget https://releases.linaro.org/archive/13.11/components/toolchain/binaries/gcc-linaro-arm-none-eabi-4.8-2013.11_linux.tar.xz
+ > tar xvfJ gcc-linaro-aarch64-none-elf-4.8-2013.11_linux.tar.xz
+ > tar xvfJ gcc-linaro-arm-none-eabi-4.8-2013.11_linux.tar.xz
+ > export PATH=$PWD/gcc-linaro-aarch64-none-elf-4.8-2013.11_linux/bin:$PWD/gcc-linaro-arm-none-eabi-4.8-2013.11_linux/bin:$PATH
+ > git clone https://github.com/khadas/u-boot -b Vim vim-u-boot
+ > cd vim-u-boot
+ > make kvim_defconfig
+ > make
+ > export FIPDIR=$PWD/fip
+
+Go back to mainline U-Boot source tree then :
+ > mkdir fip
+
+ > cp $FIPDIR/gxl/bl2.bin fip/
+ > cp $FIPDIR/gxl/acs.bin fip/
+ > cp $FIPDIR/gxl/bl21.bin fip/
+ > cp $FIPDIR/gxl/bl30.bin fip/
+ > cp $FIPDIR/gxl/bl301.bin fip/
+ > cp $FIPDIR/gxl/bl31.img fip/
+ > cp u-boot.bin fip/bl33.bin
+
+ > $FIPDIR/blx_fix.sh \
+	fip/bl30.bin \
+	fip/zero_tmp \
+	fip/bl30_zero.bin \
+	fip/bl301.bin \
+	fip/bl301_zero.bin \
+	fip/bl30_new.bin \
+	bl30
+
+ > python $FIPDIR/acs_tool.pyc fip/bl2.bin fip/bl2_acs.bin fip/acs.bin 0
+
+ > $FIPDIR/blx_fix.sh \
+	fip/bl2_acs.bin \
+	fip/zero_tmp \
+	fip/bl2_zero.bin \
+	fip/bl21.bin \
+	fip/bl21_zero.bin \
+	fip/bl2_new.bin \
+	bl2
+
+ > $FIPDIR/gxl/aml_encrypt_gxl --bl3enc --input fip/bl30_new.bin
+ > $FIPDIR/gxl/aml_encrypt_gxl --bl3enc --input fip/bl31.img
+ > $FIPDIR/gxl/aml_encrypt_gxl --bl3enc --input fip/bl33.bin
+ > $FIPDIR/gxl/aml_encrypt_gxl --bl2sig --input fip/bl2_new.bin --output fip/bl2.n.bin.sig
+ > $FIPDIR/gxl/aml_encrypt_gxl --bootmk \
+		--output fip/u-boot.bin \
+		--bl2 fip/bl2.n.bin.sig \
+		--bl30 fip/bl30_new.bin.enc \
+		--bl31 fip/bl31.img.enc \
+		--bl33 fip/bl33.bin.enc
+
+and then write the image to SD with:
+
+ > DEV=/dev/your_sd_device
+ > dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=512 skip=1 seek=1
+ > dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=1 count=444

board/amlogic/khadas-vim2/khadas-vim2.c

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+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2016 BayLibre, SAS
+ * Author: Neil Armstrong <narmstrong@baylibre.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <environment.h>
+#include <asm/io.h>
+#include <asm/arch/gx.h>
+#include <asm/arch/mem.h>
+#include <asm/arch/sm.h>
+#include <asm/arch/eth.h>
+
+#define EFUSE_SN_OFFSET		20
+#define EFUSE_SN_SIZE		16
+#define EFUSE_MAC_OFFSET	52
+#define EFUSE_MAC_SIZE		6
+
+int board_init(void)
+{
+	return 0;
+}
+
+int misc_init_r(void)
+{
+	u8 mac_addr[EFUSE_MAC_SIZE];
+	char serial[EFUSE_SN_SIZE];
+	ssize_t len;
+
+	meson_gx_eth_init(PHY_INTERFACE_MODE_RGMII, 0);
+
+	/* Reset PHY on GPIOZ_14 */
+	clrbits_le32(GX_GPIO_EN(3), BIT(14));
+	clrbits_le32(GX_GPIO_OUT(3), BIT(14));
+	mdelay(10);
+	setbits_le32(GX_GPIO_OUT(3), BIT(14));
+
+	if (!eth_env_get_enetaddr("ethaddr", mac_addr)) {
+		len = meson_sm_read_efuse(EFUSE_MAC_OFFSET,
+					  mac_addr, EFUSE_MAC_SIZE);
+		if (len == EFUSE_MAC_SIZE && is_valid_ethaddr(mac_addr))
+			eth_env_set_enetaddr("ethaddr", mac_addr);
+	}
+
+	if (!env_get("serial#")) {
+		len = meson_sm_read_efuse(EFUSE_SN_OFFSET, serial,
+					  EFUSE_SN_SIZE);
+		if (len == EFUSE_SN_SIZE)
+			env_set("serial#", serial);
+	}
+
+	return 0;
+}
+
+int ft_board_setup(void *blob, bd_t *bd)
+{
+	meson_gx_init_reserved_memory(blob);
+
+	return 0;
+}