bcm96753ref: add initial support

This add the initial support of the broadcom reference
board bcm96753ref with a bcm6753 SoC.

This board has 1 GB of RAM, 256 MB of flash (nand),
2 USB port, 1 UART, and 4 ethernet ports.

Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>

arch/arm/Kconfig

@@ -2213,6 +2213,7 @@ source "board/armltd/vexpress/Kconfig"
 source "board/armltd/vexpress64/Kconfig"
 source "board/cortina/presidio-asic/Kconfig"
 source "board/broadcom/bcm963158/Kconfig"
+source "board/broadcom/bcm96753ref/Kconfig"
 source "board/broadcom/bcm968360bg/Kconfig"
 source "board/broadcom/bcm968580xref/Kconfig"
 source "board/broadcom/bcmns3/Kconfig"

arch/arm/dts/Makefile

@@ -1104,6 +1104,9 @@ dtb-$(CONFIG_ARCH_BCM63158) += \
 dtb-$(CONFIG_ARCH_BCM68360) += \
 	bcm968360bg.dtb
 
+dtb-$(CONFIG_ARCH_BCM6753) += \
+	bcm96753ref.dtb
+
 dtb-$(CONFIG_ARCH_BCM6858) += \
 	bcm968580xref.dtb
 

arch/arm/dts/bcm96753ref.dts

@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2022 Philippe Reynes <philippe.reynes@softathome.com>
+ */
+
+/dts-v1/;
+
+#include "bcm6753.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+
+/ {
+	model = "Broadcom bcm6753ref";
+	compatible = "broadcom,bcm6753ref", "brcm,bcm6753";
+
+	aliases {
+		serial0 = &uart0;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
+	memory {
+		device_type = "memory";
+		reg = <0x0 0x40000000>;
+	};
+};
+
+&uart0 {
+	u-boot,dm-pre-reloc;
+	status = "okay";
+};
+
+&gpio0 {
+	status = "okay";
+};
+
+&gpio1 {
+	status = "okay";
+};
+
+&gpio2 {
+	status = "okay";
+};
+
+&gpio3 {
+	status = "okay";
+};
+
+&gpio4 {
+	status = "okay";
+};
+
+&gpio5 {
+	status = "okay";
+};
+
+&gpio6 {
+	status = "okay";
+};
+
+&gpio7 {
+	status = "okay";
+};
+
+&nand {
+	status = "okay";
+	write-protect = <0>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	nandcs@0 {
+		compatible = "brcm,nandcs";
+		reg = <0>;
+		nand-ecc-strength = <4>;
+		nand-ecc-step-size = <512>;
+		brcm,nand-oob-sector-size = <16>;
+	};
+};

board/broadcom/bcm96753ref/Kconfig

@@ -0,0 +1,16 @@
+if TARGET_BCM96753REF
+
+config SYS_VENDOR
+	default "broadcom"
+
+config SYS_BOARD
+	default "bcm96753ref"
+
+config SYS_CONFIG_NAME
+	default "broadcom_bcm96753ref"
+
+endif
+
+config TARGET_BCM96753REF
+	bool "Support Broadcom bcm96753ref"
+	depends on ARCH_BCM6753

board/broadcom/bcm96753ref/MAINTAINERS

@@ -0,0 +1,6 @@
+BROADCOM BCM96753REF
+M:	Philippe Reynes <philippe.reynes@softathome.com>
+S:	Maintained
+F:	board/broadcom/bcm96753ref
+F:	include/configs/broadcom_bcm96753ref.h
+F:	configs/bcm96753ref_ram_defconfig

board/broadcom/bcm96753ref/Makefile

@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0+
+
+obj-y	+= bcm96753ref.o

board/broadcom/bcm96753ref/bcm96753ref.c

@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2022 Philippe Reynes <philippe.reynes@softathome.com>
+ */
+
+#include <common.h>
+#include <fdtdec.h>
+#include <linux/io.h>
+#include <cpu_func.h>
+
+int board_init(void)
+{
+	return 0;
+}
+
+int dram_init(void)
+{
+	if (fdtdec_setup_mem_size_base() != 0)
+		printf("fdtdec_setup_mem_size_base() has failed\n");
+
+	return 0;
+}
+
+int dram_init_banksize(void)
+{
+	fdtdec_setup_memory_banksize();
+
+	return 0;
+}
+
+int print_cpuinfo(void)
+{
+	return 0;
+}
+
+void enable_caches(void)
+{
+	icache_enable();
+	dcache_enable();
+}

configs/bcm96753ref_ram_defconfig

@@ -0,0 +1,81 @@
+CONFIG_ARM=y
+CONFIG_SKIP_LOWLEVEL_INIT=y
+CONFIG_SKIP_LOWLEVEL_INIT_ONLY=y
+CONFIG_SYS_ARCH_TIMER=y
+CONFIG_ARCH_BCM6753=y
+CONFIG_SYS_TEXT_BASE=0x1000000
+CONFIG_SYS_MALLOC_F_LEN=0x1000
+CONFIG_NR_DRAM_BANKS=1
+CONFIG_ENV_SIZE=0x20000
+CONFIG_DM_GPIO=y
+CONFIG_DEFAULT_DEVICE_TREE="bcm96753ref"
+CONFIG_ARMV7_LPAE=y
+CONFIG_TARGET_BCM96753REF=y
+CONFIG_ENV_VARS_UBOOT_CONFIG=y
+CONFIG_SYS_LOAD_ADDR=0x1000000
+CONFIG_FIT=y
+CONFIG_FIT_SIGNATURE=y
+CONFIG_FIT_CIPHER=y
+CONFIG_FIT_VERBOSE=y
+CONFIG_LEGACY_IMAGE_FORMAT=y
+CONFIG_SUPPORT_RAW_INITRD=y
+CONFIG_OF_STDOUT_VIA_ALIAS=y
+# CONFIG_AUTOBOOT is not set
+CONFIG_SYS_CONSOLE_IS_IN_ENV=y
+CONFIG_HUSH_PARSER=y
+# CONFIG_CMD_BOOTD is not set
+# CONFIG_BOOTM_NETBSD 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_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_MEMINFO=y
+CONFIG_CMD_CLK=y
+CONFIG_CMD_GPIO=y
+# CONFIG_CMD_LOADS is not set
+CONFIG_CMD_MTD=y
+CONFIG_CMD_NAND=y
+CONFIG_CMD_SPI=y
+CONFIG_CMD_WDT=y
+# CONFIG_CMD_SETEXPR is not set
+CONFIG_CMD_CACHE=y
+CONFIG_CMD_MTDPARTS=y
+CONFIG_CMD_UBI=y
+# CONFIG_CMD_UBIFS is not set
+# CONFIG_NET is not set
+CONFIG_REGMAP=y
+CONFIG_SYSCON=y
+CONFIG_BUTTON=y
+CONFIG_BUTTON_GPIO=y
+CONFIG_CLK=y
+CONFIG_BCM6345_GPIO=y
+# CONFIG_INPUT is not set
+CONFIG_LED=y
+CONFIG_LED_BLINK=y
+CONFIG_LED_GPIO=y
+CONFIG_MISC=y
+# CONFIG_MMC is not set
+CONFIG_MTD=y
+CONFIG_DM_MTD=y
+CONFIG_MTD_RAW_NAND=y
+CONFIG_NAND_BRCMNAND=y
+CONFIG_NAND_BRCMNAND_6753=y
+CONFIG_PINCTRL=y
+CONFIG_PINCONF=y
+CONFIG_SPECIFY_CONSOLE_INDEX=y
+CONFIG_DM_SERIAL=y
+CONFIG_PL01X_SERIAL=y
+CONFIG_SPI=y
+CONFIG_DM_SPI=y
+CONFIG_SPI_MEM=y
+CONFIG_SYSRESET=y
+CONFIG_SYSRESET_WATCHDOG=y
+CONFIG_WDT_BCM6345=y
+CONFIG_REGEX=y

include/configs/broadcom_bcm96753ref.h

@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2022 Philippe Reynes <philippe.reynes@softathome.com>
+ */
+
+#include <linux/sizes.h>
+
+/*
+ * common
+ */
+
+/* UART */
+#define CONFIG_SYS_BAUDRATE_TABLE	{ 9600, 19200, 38400, 57600, 115200, \
+					  230400, 500000, 1500000 }
+/* Memory usage */
+#define CONFIG_SYS_MAXARGS		24
+
+/*
+ * 6853
+ */
+
+/* RAM */
+#define CONFIG_SYS_SDRAM_BASE		0x00000000
+
+/* U-Boot */
+#define CONFIG_SYS_INIT_SP_ADDR		(CONFIG_SYS_TEXT_BASE + SZ_16M)
+
+#ifdef CONFIG_MTD_RAW_NAND
+#define CONFIG_SYS_MAX_NAND_DEVICE	1
+#endif /* CONFIG_MTD_RAW_NAND */
+
+/*
+ * 96753ref
+ */