board: sam9x75_curiosity: Add support for sam9x75 curiosity

Add board specific functions for sam9x75 curiosity

Signed-off-by: Manikandan Muralidharan <manikandan.m@microchip.com>
Reviewed-by: Eugen Hristev <eugen.hristev@linaro.org>

arch/arm/mach-at91/Kconfig

@@ -158,6 +158,13 @@ config TARGET_SAM9X60_CURIOSITY
         select BOARD_EARLY_INIT_F
         select BOARD_LATE_INIT
 
+config TARGET_SAM9X75_CURIOSITY
+	bool "SAM9X75 CURIOSITY board"
+	select SAM9X7
+	select BOARD_EARLY_INIT_F
+	select BOARD_LATE_INIT
+	imply OF_UPSTREAM
+
 config TARGET_SAMA5D2_PTC_EK
 	bool "SAMA5D2 PTC EK board"
 	select BOARD_EARLY_INIT_F
@@ -355,6 +362,7 @@ source "board/atmel/at91sam9rlek/Kconfig"
 source "board/atmel/at91sam9x5ek/Kconfig"
 source "board/atmel/sam9x60ek/Kconfig"
 source "board/atmel/sam9x60_curiosity/Kconfig"
+source "board/atmel/sam9x75_curiosity/Kconfig"
 source "board/atmel/sama7g5ek/Kconfig"
 source "board/atmel/sama7g54_curiosity/Kconfig"
 source "board/atmel/sama5d2_ptc_ek/Kconfig"

board/atmel/sam9x75_curiosity/Kconfig

@@ -0,0 +1,15 @@
+if TARGET_SAM9X75_CURIOSITY
+
+config SYS_BOARD
+	default "sam9x75_curiosity"
+
+config SYS_VENDOR
+	default "atmel"
+
+config SYS_SOC
+	default "at91"
+
+config SYS_CONFIG_NAME
+	default "sam9x75_curiosity"
+
+endif

board/atmel/sam9x75_curiosity/MAINTAINERS

@@ -0,0 +1,6 @@
+SAM9X75 CURIOSITY BOARD
+M:	Manikandan Muralidharan <manikandan.m@microchip.com>
+S:	Maintained
+F:	board/atmel/sam9x75_curiosity/
+F:	include/configs/sam9x75_curiosity.h
+F:	arch/arm/dts/at91-sam9x75_curiosity-u-boot.dtsi

board/atmel/sam9x75_curiosity/Makefile

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (C) 2025 Microchip Technology Inc. and its subsidiaries
+#
+# Author: Manikandan Muralidharan <manikandan.m@microchip.com>
+
+obj-y += sam9x75_curiosity.o

board/atmel/sam9x75_curiosity/sam9x75_curiosity.c

@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2025 Microchip Technology Inc. and its subsidiaries
+ *
+ * Author: Manikandan Muralidharan <manikandan.m@microchip.com>
+ */
+
+#include <debug_uart.h>
+#include <init.h>
+#include <asm/io.h>
+#include <asm/arch/at91sam9_smc.h>
+#include <asm/arch/at91_common.h>
+#include <asm/arch/at91_rstc.h>
+#include <asm/arch/at91_sfr.h>
+#include <asm/arch/clk.h>
+#include <asm/arch/gpio.h>
+#include <asm/mach-types.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+void at91_prepare_cpu_var(void);
+
+int board_late_init(void)
+{
+	at91_prepare_cpu_var();
+
+	return 0;
+}
+
+#if (IS_ENABLED(CONFIG_DEBUG_UART_BOARD_INIT))
+static void board_dbgu0_hw_init(void)
+{
+	at91_pio3_set_a_periph(AT91_PIO_PORTA, 26, 1);	/* DRXD */
+	at91_pio3_set_a_periph(AT91_PIO_PORTA, 27, 1);	/* DTXD */
+
+	at91_periph_clk_enable(ATMEL_ID_DBGU);
+}
+
+void board_debug_uart_init(void)
+{
+	board_dbgu0_hw_init();
+}
+#endif
+
+int board_early_init_f(void)
+{
+	return 0;
+}
+
+int board_init(void)
+{
+	/* address of boot parameters */
+	gd->bd->bi_boot_params = gd->bd->bi_dram[0].start + 0x100;
+
+	return 0;
+}
+
+int dram_init_banksize(void)
+{
+	return fdtdec_setup_memory_banksize();
+}
+
+int dram_init(void)
+{
+	return fdtdec_setup_mem_size_base();
+}

include/configs/sam9x75_curiosity.h

@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Configuration settings for the SAM9X75 CURIOSITY board.
+ *
+ * Copyright (C) 2025 Microchip Technology Inc. and its subsidiaries
+ *
+ * Author: Manikandan Muralidharan <manikandan.m@microchip.com>
+ */
+
+#ifndef __CONFIG_H__
+#define __CONFIG_H__
+
+#define CFG_SYS_AT91_SLOW_CLOCK	32768
+#define CFG_SYS_AT91_MAIN_CLOCK	24000000	/* 24 MHz crystal */
+
+#define CFG_USART_BASE   ATMEL_BASE_DBGU
+#define CFG_USART_ID     0 /* ignored in arm */
+
+/* SDRAM */
+#define CFG_SYS_SDRAM_BASE		0x20000000
+#define CFG_SYS_SDRAM_SIZE		0x10000000      /* 256 megs */
+
+#endif