soc/arm/nxp_kinetis/kl2x/soc.c

/*
 * Copyright (c) 2017, NXP
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/init.h>
#include <soc.h>
#include <fsl_common.h>
#include <fsl_clock.h>
#include <zephyr/arch/cpu.h>

#define LPSCI0SRC_MCGFLLCLK	(1)

#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

/*******************************************************************************
 * Variables
 ******************************************************************************/

static ALWAYS_INLINE void clock_init(void)
{
   /*
    * Core clock: 48MHz
    * Bus clock: 24MHz
    */
	const mcg_pll_config_t pll0Config = {
	.enableMode = 0U, .prdiv = CONFIG_MCG_PRDIV0, .vdiv = CONFIG_MCG_VDIV0,
	};
	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_OUTDIV4(CLOCK_DIVIDER(flash_clk)),
	};

	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 = kOSC_ErClkEnable,
#if (defined(FSL_FEATURE_OSC_HAS_EXT_REF_CLOCK_DIVIDER) &&	\
	FSL_FEATURE_OSC_HAS_EXT_REF_CLOCK_DIVIDER)
				.erclkDiv = 0U,
#endif
				} };

	CLOCK_SetSimSafeDivs();
	CLOCK_InitOsc0(&oscConfig);

	/* Passing the XTAL0 frequency to clock driver. */
	CLOCK_SetXtal0Freq(CONFIG_OSC_XTAL0_FREQ);

	CLOCK_BootToPeeMode(kMCG_OscselOsc, kMCG_PllClkSelPll0, &pll0Config);

	CLOCK_SetInternalRefClkConfig(kMCG_IrclkEnable, kMCG_IrcSlow, 0);
	CLOCK_SetSimConfig(&simConfig);

#if DT_NODE_HAS_STATUS(DT_NODELABEL(uart0), okay)
	CLOCK_SetLpsci0Clock(LPSCI0SRC_MCGFLLCLK);
#endif
#if CONFIG_USB_KINETIS || CONFIG_UDC_KINETIS
	CLOCK_EnableUsbfs0Clock(kCLOCK_UsbSrcPll0,
				DT_PROP(DT_PATH(cpus, cpu_0), clock_frequency));
#endif
}

static int kl2x_init(void)
{

	unsigned int oldLevel; /* old interrupt lock level */

	/* disable interrupts */
	oldLevel = irq_lock();

	/* Initialize system clock to 48 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;
}

#ifdef CONFIG_PLATFORM_SPECIFIC_INIT

void z_arm_platform_init(void)
{
	SystemInit();
}

#endif /* CONFIG_PLATFORM_SPECIFIC_INIT */

SYS_INIT(kl2x_init, PRE_KERNEL_1, 0);