soc: renesas: rx: Initial support for RX261 SOC

This commit to initial support for RX261 SOC.

Signed-off-by: Hau Ho <[email protected]>
Signed-off-by: Phi Tran <[email protected]>

Author: Hau Ho

soc/renesas/rx/rx261/CMakeLists.txt

@@ -0,0 +1,12 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_include_directories(.)
+
+zephyr_sources(
+  soc.c
+)
+
+zephyr_linker_sources(SECTIONS ofsm.ld)
+
+set(SOC_LINKER_SCRIPT ${ZEPHYR_BASE}/include/zephyr/arch/rx/linker.ld CACHE INTERNAL "")

soc/renesas/rx/rx261/Kconfig

@@ -0,0 +1,10 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+config SOC_SERIES_RX261
+	select RX
+	select CPU_RXV3
+	select XIP
+	select CLOCK_CONTROL_RENESAS_RX_CGC if CLOCK_CONTROL
+	select HAS_RENESAS_RX_RDP
+	select CLOCK_CONTROL

soc/renesas/rx/rx261/Kconfig.defconfig

@@ -0,0 +1,23 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+if SOC_SERIES_RX261
+
+DT_CMT_PATH := $(dt_nodelabel_path,cmt)
+
+config SYS_CLOCK_HW_CYCLES_PER_SEC
+	default $(dt_node_int_prop_int,$(DT_CMT_PATH),clock-frequency)
+
+# SYS_CLOCK_TICKS_PER_SEC is set to 100 if PCLKB is 48MHz or less.
+# (PCLKB = SYS_CLOCK_HW_CYCLES_PER_SEC * 8)
+config SYS_CLOCK_TICKS_PER_SEC
+	default 100 if SYS_CLOCK_HW_CYCLES_PER_SEC <= 6000000
+	default 1000
+
+config INITIALIZATION_STACK_SIZE
+	default 512
+
+config BUILD_OUTPUT_HEX
+	default y
+
+endif # SOC_SERIES_RX261

soc/renesas/rx/rx261/Kconfig.soc

@@ -0,0 +1,20 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+config SOC_SERIES_RX261
+	bool
+	select SOC_FAMILY_RENESAS_RX
+	help
+	  Renesas RX261 series
+
+config SOC_R5F52618BGFP
+	bool
+	select SOC_SERIES_RX261
+	help
+	  R5F52618BGFP microcontroller SoC
+
+config SOC_SERIES
+	default "rx261" if SOC_SERIES_RX261
+
+config SOC
+	default "r5f52618bgfp" if SOC_R5F52618BGFP

soc/renesas/rx/rx261/ofsm.ld

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+SECTION_PROLOGUE(.ofsm,,)
+{
+	__OFSM_START = .;
+	KEEP(*(.ofs_mde))
+	. = __OFSM_START + 0x8;
+	KEEP(*(.ofs1))
+	. = __OFSM_START + 0xC;
+	KEEP(*(.ofs0))
+	__OFSM_END = .;
+} GROUP_LINK_IN(OFSM) = 0xFF

soc/renesas/rx/rx261/soc.c

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @brief System/hardware module for RX SOC family
+ */
+
+#include <zephyr/device.h>
+#include <zephyr/init.h>
+#include <zephyr/kernel.h>
+#include <zephyr/arch/cpu.h>
+#include <soc.h>
+
+#include "platform.h"
+#include "r_bsp_cpu.h"
+
+/**
+ * @brief Perform basic hardware initialization at boot.
+ *
+ * This needs to be run from the very beginning.
+ * So the init priority has to be 0 (zero).
+ *
+ * @return 0
+ */
+void soc_early_init_hook(void)
+{
+#ifdef CONFIG_HAS_RENESAS_RX_RDP
+	bsp_ram_initialize();
+	bsp_interrupt_open();
+	bsp_register_protect_open();
+#ifdef CONFIG_RENESAS_NONE_USED_PORT_INIT
+	/*
+	 * This is the function that initializes the unused port.
+	 * Please see datails on this in the "Handling of Unused Pins" section of PORT chapter
+	 *  of RX MCU of User's manual.
+	 * And please MUST set "BSP_PACKAGE_PINS" definition to your device of pin type in
+	 * r_bsp_config.h Otherwise, the port may output without intention.
+	 */
+	bsp_non_existent_port_init();
+
+#endif /* CONFIG_RENESAS_NONE_USED_PORT_INIT */
+#else
+	renesas_rx_register_protect_open();
+#endif /* CONFIG_HAS_RENESAS_RX_RDP */
+}

soc/renesas/rx/rx261/soc.h

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @brief SOC header file for Renesas RX SOC series
+ */
+
+#ifndef _SOC_H_
+#define _SOC_H_
+
+#include "reg_protection.h"
+#include <mcu_clocks.h>
+
+#endif /* _SOC_H_ */

soc/renesas/rx/soc.yml

@@ -7,3 +7,6 @@ family:
       - name: rx62n
         socs:
           - name: r5f562n8
+      - name: rx261
+        socs:
+          - name: r5f52618bgfp