soc/atmel/sam/same70/soc_config.c

/*
 * Copyright (c) 2016 Piotr Mienkowski
 * Copyright (c) 2024 Gerson Fernando Budke <nandojve@gmail.com>
 * SPDX-License-Identifier: Apache-2.0
 */

/** @file
 * @brief System module to support early Atmel SAM E70 MCU configuration
 */

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

/**
 * @brief Perform SoC configuration at boot.
 *
 * This should be run early during the boot process but after basic hardware
 * initialization is done.
 */
void atmel_same70_config(void)
{
	if (IS_ENABLED(CONFIG_SOC_ATMEL_SAM_DISABLE_ERASE_PIN)) {
		/* Disable ERASE function on PB12 pin, this is controlled
		 * by Bus Matrix
		 */
		MATRIX->CCFG_SYSIO |= CCFG_SYSIO_SYSIO12;
	}

	/* In Cortex-M based SoCs JTAG interface can be used to perform
	 * IEEE1149.1 JTAG Boundary scan only. It can not be used as a debug
	 * interface therefore there is no harm done by disabling the JTAG TDI
	 * pin by default.
	 */
	/* Disable TDI function on PB4 pin, this is controlled by Bus Matrix */
	MATRIX->CCFG_SYSIO |= CCFG_SYSIO_SYSIO4;

	if (IS_ENABLED(CONFIG_LOG_BACKEND_SWO)) {
		/* Disable PCK3 clock used by ETM module */
		PMC->PMC_SCDR = PMC_SCDR_PCK3;
		while ((PMC->PMC_SCSR) & PMC_SCSR_PCK3) {
			;
		}
		/* Select PLLA clock as PCK3 clock */
		PMC->PMC_PCK[3] = PMC_MCKR_CSS_PLLA_CLK;
		/* Enable PCK3 clock */
		PMC->PMC_SCER = PMC_SCER_PCK3;
		/* Wait for PCK3 setup to complete */
		while (!((PMC->PMC_SR) & PMC_SR_PCKRDY3)) {
			;
		}
		/* Enable TDO/TRACESWO function on PB5 pin */
		MATRIX->CCFG_SYSIO &= ~CCFG_SYSIO_SYSIO5;
	} else {
		/* Disable TDO/TRACESWO function on PB5 pin */
		MATRIX->CCFG_SYSIO |= CCFG_SYSIO_SYSIO5;
	}

}