soc: arm: ambiq: apollo4: Add support for Apollo4 Plus SoC

Add all required parts (new SoC family/series, device tree) for
the Ambiq Apollo4 Plus SoC.

Signed-off-by: Maciej Sobkowski <msobkowski@antmicro.com>

dts/arm/ambiq/ambiq_apollo4p.dtsi

@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: Apache-2.0 */
+
+#include <arm/armv7-m.dtsi>
+#include <mem.h>
+
+/ {
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu0: cpu@0 {
+			compatible = "arm,cortex-m4f";
+			reg = <0>;
+		};
+	};
+
+	/* MRAM region */
+	flash0: flash@18000 {
+		compatible = "soc-nv-flash";
+		reg = <0x00018000 0x1e8000>;
+	};
+
+	/* TCM + SRAM region */
+	sram0: memory@10000000 {
+		compatible = "mmio-sram";
+		reg = <0x10000000 0x2C0000>;
+	};
+};
+
+&nvic {
+	arm,num-irq-priority-bits = <3>;
+};

soc/arm/ambiq/CMakeLists.txt

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# Copyright (c) 2023 Antmicro <www.antmicro.com>
+
+add_subdirectory(${SOC_SERIES})
+
+zephyr_include_directories(.)

soc/arm/ambiq/Kconfig

@@ -0,0 +1,16 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# Copyright (c) 2023 Antmicro <www.antmicro.com>
+
+config SOC_FAMILY_AMBIQ
+	bool
+
+if SOC_FAMILY_AMBIQ
+
+config SOC_FAMILY
+	string
+	default "ambiq"
+
+source "soc/arm/ambiq/*/Kconfig.soc"
+
+endif # SOC_FAMILY_AMBIQ

soc/arm/ambiq/Kconfig.defconfig

@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# Copyright (c) 2023 Antmicro <www.antmicro.com>
+
+source "soc/arm/ambiq/*/Kconfig.defconfig.series"

soc/arm/ambiq/Kconfig.soc

@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# Copyright (c) 2023 Antmicro <www.antmicro.com>
+
+source "soc/arm/ambiq/*/Kconfig.series"

soc/arm/ambiq/apollo4x/CMakeLists.txt

@@ -0,0 +1,7 @@
+# Copyright (c) 2023 Antmicro <www.antmicro.com>
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+zephyr_sources(soc.c)
+zephyr_include_directories(${ZEPHYR_BASE}/soc/arm/common/cortex_m)

soc/arm/ambiq/apollo4x/Kconfig.defconfig.apollo4p

@@ -0,0 +1,18 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# Copyright (c) 2023 Antmicro <www.antmicro.com>
+
+if SOC_APOLLO4P
+
+config NUM_IRQS
+	default 83
+
+DT_NODE_SRAM := /memory@0
+
+config SRAM_NC_SIZE
+	default $(dt_node_reg_size_int,$(DT_NODE_SRAM),1,K)
+
+config SRAM_NC_BASE_ADDRESS
+	default $(dt_node_reg_addr_hex,$(DT_NODE_SRAM),1)
+
+endif # SOC_APOLLO4P

soc/arm/ambiq/apollo4x/Kconfig.defconfig.series

@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# Copyright (c) 2023 Antmicro <www.antmicro.com>
+
+if SOC_SERIES_APOLLO4X
+
+source "soc/arm/ambiq/apollo4x/Kconfig.defconfig.apollo4*"
+
+config SOC_SERIES
+	default "apollo4x"
+
+endif # SOC_SERIES_APOLLO4X

soc/arm/ambiq/apollo4x/Kconfig.series

@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# Copyright (c) 2023 Antmicro <www.antmicro.com>
+
+# Ambiq Apollo4 MCU Series
+
+config SOC_SERIES_APOLLO4X
+	bool "Apollo4 Series MCU"
+	select ARM
+	select CPU_CORTEX_M4
+	select CPU_CORTEX_M_HAS_DWT
+	select CPU_HAS_FPU
+	select SOC_FAMILY_AMBIQ
+	select HAS_SWO
+	select AMBIQ_HAL
+	help
+	  Enable support for Apollo4 MCU series

soc/arm/ambiq/apollo4x/Kconfig.soc

@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# Copyright (c) 2023 Antmicro <www.antmicro.com>
+
+choice
+	prompt "Ambiq Apollo4X Selection"
+	depends on SOC_SERIES_APOLLO4X
+
+config SOC_APOLLO4P
+	bool "Apollo4P"
+
+endchoice

soc/arm/ambiq/apollo4x/linker.ld

@@ -0,0 +1,7 @@
+/*
+ * Copyright (c) 2023 Antmicro <www.antmicro.com>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/arch/arm/aarch32/cortex_m/scripts/linker.ld>

soc/arm/ambiq/apollo4x/soc.c

@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2023 Antmicro <www.antmicro.com>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/init.h>
+
+#include <am_mcu_apollo.h>
+
+static int arm_apollo4_init(void)
+{
+	am_hal_pwrctrl_low_power_init();
+	am_hal_rtc_osc_disable();
+
+	return 0;
+}
+
+SYS_INIT(arm_apollo4_init, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);

soc/arm/ambiq/apollo4x/soc.h

@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2023 Antmicro <www.antmicro.com>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef __SOC_H__
+#define __SOC_H__
+
+#include <apollo4p.h>
+
+#endif /* __SOC_H__ */