soc: arm: Add Nuvoton NPCX7M6FB SoC

Initial support for Nuvoton NPCX7M6FB SoC of NPCX series which is a chip
family of embedded controllers (EC) and targeted for a wide range of
portable applications. We implemented the SoC skeleton in
soc/arm/nuvoton_npcx since there're many chip families in Nuvoton and
aim to different markets such as PC, General MCU, and Audio. The
architectures and hardware modules are different between them. Hence, we
suggest using the company name plus with chip series for better
understanding.

Signed-off-by: Mulin Chao <mlchao@nuvoton.com>

CODEOWNERS

@@ -40,6 +40,7 @@
 /soc/arm/nxp*/                            @MaureenHelm
 /soc/arm/nordic_nrf/                      @ioannisg
 /soc/arm/nuvoton/                         @ssekar15
+/soc/arm/nuvoton_npcx/                    @MulinChao
 /soc/arm/qemu_cortex_a53/                 @carlocaione
 /soc/arm/silabs_exx32/efr32mg21/          @l-alfred
 /soc/arm/st_stm32/                        @erwango

dts/arm/nuvoton/npcx7m6fb.dtsi

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2020 Nuvoton Technology Corporation.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <arm/armv7-m.dtsi>
+
+/ {
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu@0 {
+			device_type = "cpu";
+			compatible = "arm,cortex-m4f";
+			reg = <0>;
+		};
+	};
+
+	flash0: flash@10090000 {
+		reg = <0x10090000 0x30000>;
+	};
+
+	sram0: memory@200c0000 {
+		compatible = "mmio-sram";
+		reg = <0x200C0000 0x10000>;
+	};
+};
+
+&nvic {
+	arm,num-irq-priority-bits = <3>;
+};
+

soc/arm/nuvoton_npcx/CMakeLists.txt

@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: Apache-2.0
+
+add_subdirectory(common)
+add_subdirectory(${SOC_SERIES})

soc/arm/nuvoton_npcx/Kconfig

@@ -0,0 +1,17 @@
+# Nuvoton Cortex-M4 Embedded Controller
+
+# Copyright (c) 2020 Nuvoton Technology Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+config SOC_FAMILY_NPCX
+	bool
+
+if SOC_FAMILY_NPCX
+config SOC_FAMILY
+	string
+	default "nuvoton_npcx"
+
+# Select SoC Part No. and configuration options
+source "soc/arm/nuvoton_npcx/*/Kconfig.soc"
+
+endif # SOC_FAMILY_NPCX

soc/arm/nuvoton_npcx/Kconfig.defconfig

@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: Apache-2.0
+
+# Copyright (c) 2020 Nuvoton Technology Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+source "soc/arm/nuvoton_npcx/*/Kconfig.defconfig.series"

soc/arm/nuvoton_npcx/Kconfig.soc

@@ -0,0 +1,6 @@
+# Nuvoton Cortex-M4 Embedded Controller
+
+# Copyright (c) 2020 Nuvoton Technology Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+source "soc/arm/nuvoton_npcx/*/Kconfig.series"

soc/arm/nuvoton_npcx/common/CMakeLists.txt

@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_include_directories(.)

soc/arm/nuvoton_npcx/common/reg/reg_access.h

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2020 Nuvoton Technology Corporation.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef _NUVOTON_NPCX_REG_ACCESS_H
+#define _NUVOTON_NPCX_REG_ACCESS_H
+
+/*
+ * NPCX register bit/field access operations
+ */
+#define IS_BIT_SET(reg, bit)        ((reg >> bit) & (0x1))
+
+#define GET_POS_FIELD(pos, size)    pos
+#define GET_SIZE_FIELD(pos, size)   size
+#define FIELD_POS(field)            GET_POS_##field
+#define FIELD_SIZE(field)           GET_SIZE_##field
+
+#define GET_FIELD(reg, field) \
+	_GET_FIELD_(reg, FIELD_POS(field), FIELD_SIZE(field))
+#define _GET_FIELD_(reg, f_pos, f_size) (((reg)>>(f_pos)) & ((1<<(f_size))-1))
+
+#define SET_FIELD(reg, field, value) \
+	_SET_FIELD_(reg, FIELD_POS(field), FIELD_SIZE(field), value)
+#define _SET_FIELD_(reg, f_pos, f_size, value) \
+	((reg) = ((reg) & (~(((1 << (f_size))-1) << (f_pos)))) \
+			| ((value) << (f_pos)))
+
+#endif /* _NUVOTON_NPCX_REG_ACCESS_H */

soc/arm/nuvoton_npcx/common/reg/reg_def.h

@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2020 Nuvoton Technology Corporation.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef _NUVOTON_NPCX_REG_DEF_H
+#define _NUVOTON_NPCX_REG_DEF_H
+
+#endif /* _NUVOTON_NPCX_REG_DEF_H */
+
+

soc/arm/nuvoton_npcx/npcx7/CMakeLists.txt

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_include_directories(${ZEPHYR_BASE}/drivers)
+
+zephyr_sources(
+  soc.c
+)

soc/arm/nuvoton_npcx/npcx7/Kconfig.defconfig.npcx7m6fb

@@ -0,0 +1,11 @@
+# Nuvoton Cortex-M4 Embedded Controller
+
+# Copyright (c) 2020 Nuvoton Technology Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+if SOC_NPCX7M6FB
+
+config SOC
+	default "npcx76mfb"
+
+endif # SOC_NPCX7M6FB

soc/arm/nuvoton_npcx/npcx7/Kconfig.defconfig.series

@@ -0,0 +1,16 @@
+# Nuvoton Cortex-M4 Embedded Controller
+
+# Copyright (c) 2020 Nuvoton Technology Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+if SOC_SERIES_NPCX7
+
+config SOC_SERIES
+	default "npcx7"
+
+config NUM_IRQS
+	default 64
+	
+source "soc/arm/nuvoton_npcx/npcx7/Kconfig.defconfig.npcx7*"
+
+endif # SOC_SERIES_NPCX7

soc/arm/nuvoton_npcx/npcx7/Kconfig.series

@@ -0,0 +1,15 @@
+# Nuvoton Cortex-M4 Embedded Controller NPCX7 series
+
+# Copyright (c) 2020 Nuvoton Technology Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+config SOC_SERIES_NPCX7
+	bool "Nuvoton NPCX7 Series"
+	select ARM
+	select CPU_CORTEX_M4
+	select CPU_CORTEX_M_HAS_DWT
+	select CPU_HAS_FPU
+	select CPU_HAS_ARM_MPU
+	select SOC_FAMILY_NPCX
+	help
+	  Enable support for Nuvoton NPCX7 series

soc/arm/nuvoton_npcx/npcx7/Kconfig.soc

@@ -0,0 +1,13 @@
+# Nuvoton NPCX7 EC series
+
+# Copyright (c) 2020 Nuvoton Technology Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+choice
+	prompt "NPCX7M6FB Selection"
+	depends on SOC_SERIES_NPCX7
+
+config SOC_NPCX7M6FB
+	bool "NPCX7M6FB"
+
+endchoice

soc/arm/nuvoton_npcx/npcx7/linker.ld

@@ -0,0 +1,9 @@
+/* linker.ld - Linker command/script file */
+
+/*
+ * Copyright (c) 2020 Nuvoton Technology Corporation.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <arch/arm/aarch32/cortex_m/scripts/linker.ld>

soc/arm/nuvoton_npcx/npcx7/soc.c

@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2020 Nuvoton Technology Corporation.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <kernel.h>
+#include <device.h>
+#include <init.h>
+#include <soc.h>
+
+static int soc_init(struct device *dev)
+{
+	ARG_UNUSED(dev);
+
+	return 0;
+}
+
+SYS_INIT(soc_init, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);

soc/arm/nuvoton_npcx/npcx7/soc.h

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2020 Nuvoton Technology Corporation.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef _NUVOTON_NPCX_SOC_H_
+#define _NUVOTON_NPCX_SOC_H_
+
+/* CMSIS required definitions */
+#define __FPU_PRESENT  CONFIG_CPU_HAS_FPU
+#define __MPU_PRESENT  CONFIG_CPU_HAS_ARM_MPU
+
+/* Add include for DTS generated information */
+#include <devicetree.h>
+
+#include <reg/reg_access.h>
+#include <reg/reg_def.h>
+
+#endif /* _NUVOTON_NPCX_SOC_H_ */