106 lines
2.3 KiB
C
106 lines
2.3 KiB
C
/*
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* Copyright (c) 2017, Christian Taedcke
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief SoC initialization for the EFM32WG
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*/
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#include <kernel.h>
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#include <init.h>
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#include <soc.h>
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#include <em_cmu.h>
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#include <em_chip.h>
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#include <arch/cpu.h>
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#include <cortex_m/exc.h>
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#ifdef CONFIG_CMU_HFCLK_HFXO
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/**
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* @brief Initialization parameters for the external high frequency oscillator
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*/
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static const CMU_HFXOInit_TypeDef hfxoInit = CMU_HFXOINIT_DEFAULT;
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#elif (defined CONFIG_CMU_HFCLK_LFXO)
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/**
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* @brief Initialization parameters for the external low frequency oscillator
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*/
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static const CMU_LFXOInit_TypeDef lfxoInit = CMU_LFXOINIT_DEFAULT;
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#endif
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/**
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* @brief Initialize the system clock
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*
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* @return N/A
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*
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*/
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static ALWAYS_INLINE void clkInit(void)
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{
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#ifdef CONFIG_CMU_HFCLK_HFXO
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CMU_HFXOInit(&hfxoInit);
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CMU_OscillatorEnable(cmuOsc_HFXO, true, true);
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CMU_ClockSelectSet(cmuClock_HF, cmuSelect_HFXO);
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CMU_OscillatorEnable(cmuOsc_HFRCO, false, false);
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SystemHFXOClockSet(CONFIG_CMU_HFXO_FREQ);
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#elif (defined CONFIG_CMU_HFCLK_LFXO)
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CMU_LFXOInit(&lfxoInit);
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CMU_OscillatorEnable(cmuOsc_LFXO, true, true);
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CMU_ClockSelectSet(cmuClock_HF, cmuSelect_LFXO);
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CMU_OscillatorEnable(cmuOsc_HFRCO, false, false);
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SystemLFXOClockSet(CONFIG_CMU_LFXO_FREQ);
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#elif (defined CONFIG_CMU_HFCLK_HFRCO)
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/*
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* This is the default clock, the controller starts with, so nothing to
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* do here.
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*/
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#else
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#error "Unsupported clock source for HFCLK selected"
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#endif
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/* Enable the High Frequency Peripheral Clock */
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CMU_ClockEnable(cmuClock_HFPER, true);
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#ifdef CONFIG_GPIO_GECKO
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CMU_ClockEnable(cmuClock_GPIO, true);
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#endif
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}
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/**
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* @brief Perform basic hardware initialization
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*
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* Initialize the interrupt controller device drivers.
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* Also initialize the timer device driver, if required.
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*
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* @return 0
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*/
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static int silabs_efm32wg_init(struct device *arg)
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{
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ARG_UNUSED(arg);
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int oldLevel; /* old interrupt lock level */
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/* disable interrupts */
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oldLevel = irq_lock();
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/* handle chip errata */
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CHIP_Init();
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_ClearFaults();
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/* Initialize system clock according to CONFIG_CMU settings */
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clkInit();
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/*
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* install default handler that simply resets the CPU
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* if configured in the kernel, NOP otherwise
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*/
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NMI_INIT();
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/* restore interrupt state */
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irq_unlock(oldLevel);
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return 0;
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}
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SYS_INIT(silabs_efm32wg_init, PRE_KERNEL_1, 0);
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