zephyr/soc/arm/nxp_imx/rt/soc.c

/*
 * Copyright (c) 2017,2018, NXP
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <kernel.h>
#include <device.h>
#include <init.h>
#include <soc.h>
#include <linker/sections.h>
#include <fsl_clock.h>
#include <arch/cpu.h>
#include <cortex_m/exc.h>
#include <fsl_flexspi_nor_boot.h>

#ifdef CONFIG_INIT_ARM_PLL
/* ARM PLL configuration for RUN mode */
const clock_arm_pll_config_t armPllConfig = {
	.loopDivider = 100U
};
#endif

#ifdef CONFIG_INIT_SYS_PLL
/* SYS PLL configuration for RUN mode */
const clock_sys_pll_config_t sysPllConfig = {
	.loopDivider = 1U
};
#endif

#ifdef CONFIG_INIT_USB1_PLL
/* USB1 PLL configuration for RUN mode */
const clock_usb_pll_config_t usb1PllConfig = {
	.loopDivider = 0U
};
#endif

#ifdef CONFIG_INIT_ENET_PLL
/* ENET PLL configuration for RUN mode */
const clock_enet_pll_config_t ethPllConfig = {
#ifdef CONFIG_SOC_MIMXRT1021
	.enableClkOutput500M = true,
#endif
#ifdef CONFIG_ETH_MCUX
	.enableClkOutput = true,
#endif
	.enableClkOutput25M = false,
	.loopDivider = 1,
};
#endif

#ifdef CONFIG_NXP_IMX_RT_BOOT_HEADER
const __imx_boot_data_section BOOT_DATA_T boot_data = {
	.start = CONFIG_FLASH_BASE_ADDRESS,
	.size = CONFIG_FLASH_SIZE,
	.plugin = PLUGIN_FLAG,
	.placeholder = 0xFFFFFFFF,
};

const __imx_boot_ivt_section ivt image_vector_table = {
	.hdr = IVT_HEADER,
	.entry = CONFIG_FLASH_BASE_ADDRESS + CONFIG_TEXT_SECTION_OFFSET,
	.reserved1 = IVT_RSVD,
#ifdef CONFIG_DEVICE_CONFIGURATION_DATA
	.dcd = (uint32_t) dcd_data,
#else
	.dcd = (uint32_t) NULL,
#endif
	.boot_data = (uint32_t) &boot_data,
	.self = (uint32_t) &image_vector_table,
	.csf = (uint32_t)CSF_ADDRESS,
	.reserved2 = IVT_RSVD,
};
#endif

/**
 *
 * @brief Initialize the system clock
 *
 * @return N/A
 *
 */
static ALWAYS_INLINE void clkInit(void)
{
	/* Boot ROM did initialize the XTAL, here we only sets external XTAL
	 * OSC freq
	 */
	CLOCK_SetXtalFreq(24000000U);
	CLOCK_SetRtcXtalFreq(32768U);

	/* Set PERIPH_CLK2 MUX to OSC */
	CLOCK_SetMux(kCLOCK_PeriphClk2Mux, 0x1);

	/* Set PERIPH_CLK MUX to PERIPH_CLK2 */
	CLOCK_SetMux(kCLOCK_PeriphMux, 0x1);

	/* Setting the VDD_SOC to 1.5V. It is necessary to config AHB to 600Mhz
	 */
	DCDC->REG3 = (DCDC->REG3 & (~DCDC_REG3_TRG_MASK)) | DCDC_REG3_TRG(0x12);
	/* Waiting for DCDC_STS_DC_OK bit is asserted */
	while (DCDC_REG0_STS_DC_OK_MASK !=
			(DCDC_REG0_STS_DC_OK_MASK & DCDC->REG0)) {
		;
	}

#ifdef CONFIG_INIT_ARM_PLL
	CLOCK_InitArmPll(&armPllConfig); /* Configure ARM PLL to 1200M */
#endif
#ifdef CONFIG_INIT_SYS_PLL
	CLOCK_InitSysPll(&sysPllConfig); /* Configure SYS PLL to 528M */
#endif
#ifdef CONFIG_INIT_USB1_PLL
	CLOCK_InitUsb1Pll(&usb1PllConfig); /* Configure USB1 PLL to 480M */
#endif
#ifdef CONFIG_INIT_ENET_PLL
	CLOCK_InitEnetPll(&ethPllConfig);
#endif

	CLOCK_SetDiv(kCLOCK_ArmDiv, CONFIG_ARM_DIV); /* Set ARM PODF */
	CLOCK_SetDiv(kCLOCK_AhbDiv, CONFIG_AHB_DIV); /* Set AHB PODF */
	CLOCK_SetDiv(kCLOCK_IpgDiv, CONFIG_IPG_DIV); /* Set IPG PODF */

	/* Set PRE_PERIPH_CLK to PLL1, 1200M */
	CLOCK_SetMux(kCLOCK_PrePeriphMux, 0x3);

	/* Set PERIPH_CLK MUX to PRE_PERIPH_CLK */
	CLOCK_SetMux(kCLOCK_PeriphMux, 0x0);

#ifdef CONFIG_UART_MCUX_LPUART
	/* Configure UART divider to default */
	CLOCK_SetMux(kCLOCK_UartMux, 0); /* Set UART source to PLL3 80M */
	CLOCK_SetDiv(kCLOCK_UartDiv, 0); /* Set UART divider to 1 */
#endif

#ifdef CONFIG_I2C_MCUX_LPI2C
	CLOCK_SetMux(kCLOCK_Lpi2cMux, 0); /* Set I2C source as USB1 PLL 480M */
	CLOCK_SetDiv(kCLOCK_Lpi2cDiv, 5); /* Set I2C divider to 6 */
#endif

#ifdef CONFIG_SPI_MCUX_LPSPI
	CLOCK_SetMux(kCLOCK_LpspiMux, 1); /* Set SPI source to USB1 PFD0 720M */
	CLOCK_SetDiv(kCLOCK_LpspiDiv, 7); /* Set SPI divider to 8 */
#endif

	/* Keep the system clock running so SYSTICK can wake up the system from
	 * wfi.
	 */
	CLOCK_SetMode(kCLOCK_ModeRun);

}

/**
 *
 * @brief Perform basic hardware initialization
 *
 * Initialize the interrupt controller device drivers.
 * Also initialize the timer device driver, if required.
 *
 * @return 0
 */

static int imxrt_init(struct device *arg)
{
	ARG_UNUSED(arg);

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

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

	/* Watchdog disable */
	if ((WDOG1->WCR & WDOG_WCR_WDE_MASK) != 0) {
		WDOG1->WCR &= ~WDOG_WCR_WDE_MASK;
	}

	if ((WDOG2->WCR & WDOG_WCR_WDE_MASK) != 0) {
		WDOG2->WCR &= ~WDOG_WCR_WDE_MASK;
	}

	RTWDOG->CNT = 0xD928C520U; /* 0xD928C520U is the update key */
	RTWDOG->TOVAL = 0xFFFF;
	RTWDOG->CS = (uint32_t) ((RTWDOG->CS) & ~RTWDOG_CS_EN_MASK)
		| RTWDOG_CS_UPDATE_MASK;

	/* Disable Systick which might be enabled by bootrom */
	if ((SysTick->CTRL & SysTick_CTRL_ENABLE_Msk) != 0) {
		SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
	}

	SCB_EnableICache();
	if ((SCB->CCR & SCB_CCR_DC_Msk) == 0) {
		SCB_EnableDCache();
	}

	_ClearFaults();

	/* Initialize system clock */
	clkInit();

	/*
	 * 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(imxrt_init, PRE_KERNEL_1, 0);