soc/st/stm32/stm32l1x/soc.c

/*
 * Copyright (c) 2019 Linaro Ltd.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

/**
 * @file
 * @brief System/hardware module for STM32L1 processor
 */

#include <zephyr/device.h>
#include <zephyr/init.h>
#include <zephyr/linker/linker-defs.h>
#include <string.h>
#include <stm32_ll_bus.h>
#include <stm32_ll_pwr.h>
#include <stm32_ll_system.h>

#include <cmsis_core.h>

/**
 * @brief Perform basic hardware initialization at boot.
 *
 * This needs to be run from the very beginning.
 */
void soc_early_init_hook(void)
{
	/* Enable ART accelerator prefetch */
	LL_FLASH_EnablePrefetch();

	/* Update CMSIS SystemCoreClock variable (HCLK) */
	/* At reset, system core clock is set to 2.1 MHz from MSI */
	SystemCoreClock = 2097000;

	/* Default Voltage scaling range selection (range2)
	 * doesn't allow to configure Max frequency
	 * switch to range1 to match any frequency
	 */
	LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_PWR);
	LL_PWR_SetRegulVoltageScaling(LL_PWR_REGU_VOLTAGE_SCALE1);
}