soc/arm/rpi_pico/rp2/soc.c

/*
 * Copyright (c) 2021 Nordic Semiconductor ASA
 * Copyright (c) 2021 Yonatan Schachter
 *
 * SPDX-License-Identifier: Apache-2.0
 */

/**
 * @file
 * @brief System/hardware module for Raspberry Pi RP2040 family processor
 *
 * This module provides routines to initialize and support board-level hardware
 * for the Raspberry Pi RP2040 family processor.
 */

#include <stdio.h>

#include <zephyr/arch/arm/aarch32/nmi.h>
#include <zephyr/kernel.h>
#include <zephyr/init.h>
#include <zephyr/logging/log.h>
#include <zephyr/fatal.h>

#include <hardware/regs/resets.h>
#include <hardware/clocks.h>
#include <hardware/resets.h>

LOG_MODULE_REGISTER(soc, CONFIG_SOC_LOG_LEVEL);

static int rp2040_init(void)
{
	uint32_t key;

	reset_block(~(RESETS_RESET_IO_QSPI_BITS | RESETS_RESET_PADS_QSPI_BITS |
		      RESETS_RESET_PLL_USB_BITS | RESETS_RESET_PLL_SYS_BITS));

	unreset_block_wait(RESETS_RESET_BITS &
			   ~(RESETS_RESET_ADC_BITS | RESETS_RESET_RTC_BITS |
			     RESETS_RESET_SPI0_BITS | RESETS_RESET_SPI1_BITS |
			     RESETS_RESET_UART0_BITS | RESETS_RESET_UART1_BITS |
			     RESETS_RESET_USBCTRL_BITS | RESETS_RESET_PWM_BITS));

	clocks_init();

	unreset_block_wait(RESETS_RESET_BITS);


	key = irq_lock();

	/* Install default handler that simply resets the CPU
	 * if configured in the kernel, NOP otherwise
	 */
	NMI_INIT();

	irq_unlock(key);

	return 0;
}

/*
 * Some pico-sdk drivers call panic on fatal error.
 * This alternative implementation of panic handles the panic
 * through Zephyr.
 */
void __attribute__((noreturn)) panic(const char *fmt, ...)
{
	va_list args;

	va_start(args, fmt);
	vprintf(fmt, args);
	k_fatal_halt(K_ERR_CPU_EXCEPTION);
}

SYS_INIT(rp2040_init, PRE_KERNEL_1, 0);