blob: b67f5c7a1e0e4425e3820d6d88a0818077f3aa86 [file] [log] [blame]
/*
* Copyright (c) 2019 Philippe Retornaz <philippe@shapescale.com>
* Copyright (c) 2019 STMicroelectronics
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file
* @brief System/hardware module for STM32G0 processor
*/
#include <device.h>
#include <init.h>
#include <arch/cpu.h>
#include <arch/arm/cortex_m/cmsis.h>
#include <linker/linker-defs.h>
#include <string.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 stm32g0_init(struct device *arg)
{
u32_t key;
ARG_UNUSED(arg);
key = irq_lock();
/* 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 16 MHz from HSI */
SystemCoreClock = 16000000;
return 0;
}
SYS_INIT(stm32g0_init, PRE_KERNEL_1, 0);