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/*
* Copyright (c) 2014-2015 Wind River Systems, Inc.
* Copyright (c) 2016, Freescale Semiconductor, Inc.
* Copyright (c) 2018 Prevas A/S
* Copyright (c) 2019 Thomas Burdick <thomas.burdick@gmail.com>
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file
* @brief System/hardware module for fsl_frdm_k22f platform
*
* This module provides routines to initialize and support board-level
* hardware for the fsl_frdm_k22f platform.
*/
#include <kernel.h>
#include <device.h>
#include <init.h>
#include <soc.h>
#include <drivers/uart.h>
#include <fsl_common.h>
#include <fsl_clock.h>
#include <arch/cpu.h>
#include <arch/arm/aarch32/cortex_m/cmsis.h>
#define TIMESRC_OSCERCLK (2)
#define CLOCK_NODEID(clk) \
DT_CHILD(DT_INST(0, nxp_kinetis_sim), clk)
#define CLOCK_DIVIDER(clk) \
DT_PROP_OR(CLOCK_NODEID(clk), clock_div, 1) - 1
static const osc_config_t oscConfig = {
.freq = CONFIG_OSC_XTAL0_FREQ,
.capLoad = 0,
#if defined(CONFIG_OSC_EXTERNAL)
.workMode = kOSC_ModeExt,
#elif defined(CONFIG_OSC_LOW_POWER)
.workMode = kOSC_ModeOscLowPower,
#elif defined(CONFIG_OSC_HIGH_GAIN)
.workMode = kOSC_ModeOscHighGain,
#else
#error "An oscillator mode must be defined"
#endif
.oscerConfig = {
.enableMode = 0U, /* Disable external reference clock */
.erclkDiv = 0U,
},
};
static const mcg_pll_config_t pll0Config = {
.enableMode = 0U,
.prdiv = CONFIG_MCG_PRDIV0,
.vdiv = CONFIG_MCG_VDIV0,
};
static const sim_clock_config_t simConfig = {
.pllFllSel = DT_PROP(DT_INST(0, nxp_kinetis_sim), pllfll_select),
.er32kSrc = DT_PROP(DT_INST(0, nxp_kinetis_sim), er32k_select),
.clkdiv1 = SIM_CLKDIV1_OUTDIV1(CLOCK_DIVIDER(core_clk)) |
SIM_CLKDIV1_OUTDIV2(CLOCK_DIVIDER(bus_clk)) |
SIM_CLKDIV1_OUTDIV3(CLOCK_DIVIDER(flexbus_clk)) |
SIM_CLKDIV1_OUTDIV4(CLOCK_DIVIDER(flash_clk)),
};
/**
*
* @brief Initialize the system clock
*
* This routine will configure the multipurpose clock generator (MCG) to
* set up the system clock.
* The MCG has nine possible modes, including Stop mode. This routine assumes
* that the current MCG mode is FLL Engaged Internal (FEI), as from reset.
* It transitions through the FLL Bypassed External (FBE) and
* PLL Bypassed External (PBE) modes to get to the desired
* PLL Engaged External (PEE) mode and generate the maximum 120 MHz system
* clock.
*
*/
static ALWAYS_INLINE void clock_init(void)
{
CLOCK_SetSimSafeDivs();
CLOCK_InitOsc0(&oscConfig);
CLOCK_SetXtal0Freq(CONFIG_OSC_XTAL0_FREQ);
CLOCK_SetInternalRefClkConfig(kMCG_IrclkEnable, kMCG_IrcSlow,
CONFIG_MCG_FCRDIV);
/* Configure FLL external reference divider (FRDIV). */
CLOCK_SetFllExtRefDiv(0);
CLOCK_BootToPeeMode(kMCG_OscselOsc, kMCG_PllClkSelPll0, &pll0Config);
CLOCK_SetSimConfig(&simConfig);
#if CONFIG_USB_KINETIS
CLOCK_EnableUsbfs0Clock(kCLOCK_UsbSrcPll0,
CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC);
#endif
}
/**
*
* @brief Perform basic hardware initialization
*
* Initialize the interrupt controller device drivers.
* Also initialize the timer device driver, if required.
*
* @return 0
*/
static int fsl_frdm_k22f_init(const struct device *arg)
{
ARG_UNUSED(arg);
unsigned int oldLevel; /* old interrupt lock level */
/* disable interrupts */
oldLevel = irq_lock();
/* release I/O power hold to allow normal run state */
PMC->REGSC |= PMC_REGSC_ACKISO_MASK;
/* Initialize PLL/system clock to 120 MHz */
clock_init();
/*
* install default handler that simply resets the CPU
* if configured in the kernel, NOP otherwise
*/
NMI_INIT();
/* restore interrupt state */
irq_unlock(oldLevel);
return 0;
}
SYS_INIT(fsl_frdm_k22f_init, PRE_KERNEL_1, 0);