1 /*
2  * Copyright (c) 2020 STMicroelectronics
3  *
4  * SPDX-License-Identifier: Apache-2.0
5  */
6 
7 /**
8  * @file
9  * @brief System/hardware module for STM32WL processor
10  */
11 
12 #include <zephyr/device.h>
13 #include <zephyr/init.h>
14 
15 #include <stm32wlxx_ll_system.h>
16 
17 #include <zephyr/logging/log.h>
18 
19 #include <cmsis_core.h>
20 
21 #define LOG_LEVEL CONFIG_SOC_LOG_LEVEL
22 LOG_MODULE_REGISTER(soc);
23 
24 extern void stm32_pm_init(void);
25 /**
26  * @brief Perform basic hardware initialization at boot.
27  *
28  * This needs to be run from the very beginning.
29  */
soc_early_init_hook(void)30 void soc_early_init_hook(void)
31 {
32 	/* Enable CPU data and instruction cache and prefetch */
33 	LL_FLASH_EnableInstCache();
34 	LL_FLASH_EnableDataCache();
35 	LL_FLASH_EnablePrefetch();
36 
37 	/* Update CMSIS SystemCoreClock variable (HCLK) */
38 	/* At reset, system core clock is set to 4 MHz from MSI */
39 	SystemCoreClock = 4000000;
40 #if CONFIG_PM
41 	stm32_pm_init();
42 #endif
43 }
44