soc/arm/st_stm32: Add support for stm32wb soc

Provide basic soc configuration for STM32WB SoCs support in Zephyr.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>

soc/arm/st_stm32/stm32wb/CMakeLists.txt

@@ -0,0 +1,4 @@
+zephyr_include_directories(${ZEPHYR_BASE}/drivers)
+zephyr_sources(
+  soc.c
+  )

soc/arm/st_stm32/stm32wb/Kconfig.defconfig.series

@@ -0,0 +1,15 @@
+# Kconfig - ST Microelectronics STM32WB MCU line
+#
+# Copyright (c) 2019 Linaro Limited
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+if SOC_SERIES_STM32WBX
+
+source "soc/arm/st_stm32/stm32wb/Kconfig.defconfig.stm32wb*"
+
+config SOC_SERIES
+	default "stm32wb"
+
+endif # SOC_SERIES_STM32WBX

soc/arm/st_stm32/stm32wb/Kconfig.defconfig.stm32wb55xx

@@ -0,0 +1,18 @@
+# Kconfig - ST Microelectronics STM32WB55XX MCU
+#
+# Copyright (c) 2019 Linaro Limited
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+if SOC_STM32WB55XG
+
+config SOC
+	string
+	default "stm32wb55xx"
+
+config NUM_IRQS
+	int
+	default 63
+
+endif # SOC_STM32WB55XG

soc/arm/st_stm32/stm32wb/Kconfig.series

@@ -0,0 +1,17 @@
+# Kconfig - ST Microelectronics STM32WB MCU series
+#
+# Copyright (c) 2019 Linaro Limited
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+config SOC_SERIES_STM32WBX
+	bool "STM32WBx Series MCU"
+	select CPU_CORTEX_M4
+	select CPU_HAS_FPU
+	select SOC_FAMILY_STM32
+	select HAS_STM32CUBE
+	select CPU_HAS_ARM_MPU
+	select CPU_HAS_SYSTICK
+	help
+	  Enable support for STM32WB MCU series

soc/arm/st_stm32/stm32wb/Kconfig.soc

@@ -0,0 +1,15 @@
+# Kconfig - ST Microelectronics STM32WB MCU line
+#
+# Copyright (c) 2019 Linaro Limited
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+choice
+	prompt "STM32WBx MCU Selection"
+	depends on SOC_SERIES_STM32WBX
+
+config SOC_STM32WB55XG
+	bool "STM32WB55XX"
+
+endchoice

soc/arm/st_stm32/stm32wb/dts_fixup.h

@@ -0,0 +1,11 @@
+/*
+ * Copyright (c) 2019 Linaro Limited
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/* SoC level DTS fixup file */
+
+#define DT_NUM_IRQ_PRIO_BITS			DT_ARM_V7M_NVIC_E000E100_ARM_NUM_IRQ_PRIORITY_BITS
+
+/* End of SoC Level DTS fixup file */

soc/arm/st_stm32/stm32wb/linker.ld

@@ -0,0 +1,9 @@
+/* linker.ld - Linker command/script file */
+
+/*
+ * Copyright (c) 2014-2016 Wind River Systems, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <arch/arm/cortex_m/scripts/linker.ld>

soc/arm/st_stm32/stm32wb/soc.c

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2018 Linaro Limited
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @file
+ * @brief System/hardware module for STM32WB processor
+ */
+
+#include <device.h>
+#include <init.h>
+#include <arch/cpu.h>
+#include <cortex_m/exc.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
+ */
+static int stm32wb_init(struct device *arg)
+{
+	u32_t key;
+
+	ARG_UNUSED(arg);
+
+	key = irq_lock();
+
+	z_clearfaults();
+
+	/* Install default handler that simply resets the CPU
+	 * if configured in the kernel, NOP otherwise
+	 */
+	NMI_INIT();
+
+	irq_unlock(key);
+
+	/* Update CMSIS SystemCoreClock variable (HCLK) */
+	/* At reset, system core clock is set to 4 MHz from MSI */
+	SystemCoreClock = 4000000;
+
+	return 0;
+}
+
+SYS_INIT(stm32wb_init, PRE_KERNEL_1, 0);

soc/arm/st_stm32/stm32wb/soc.h

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2019 Linaro Limited
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @file SoC configuration macros for the STM32WB family processors.
+ *
+ */
+
+
+#ifndef _STM32WBX_SOC_H_
+#define _STM32WBX_SOC_H_
+
+#ifndef _ASMLANGUAGE
+
+#include <stm32wbxx.h>
+
+/* ARM CMSIS definitions must be included before kernel_includes.h.
+ * Therefore, it is essential to include kernel_includes.h after including
+ * core SOC-specific headers.
+ */
+#include <kernel_includes.h>
+
+#endif /* !_ASMLANGUAGE */
+
+#endif /* _STM32WBX_SOC_H_ */

soc/arm/st_stm32/stm32wb/soc_registers.h

@@ -0,0 +1,10 @@
+/*
+ * Copyright (c) 2018 Linaro Limited
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef _STM32WBX_SOC_REGISTERS_H_
+#define _STM32WBX_SOC_REGISTERS_H_
+
+#endif /* _STM32WBX_SOC_REGISTERS_H_ */