u-boot/arch/arm/cpu/sa1100/cpu.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <mgroeger@sysgo.de>
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Alex Zuepke <azu@sysgo.de>
 */

/*
 * CPU specific code
 */

#include <common.h>
#include <command.h>
#include <cpu_func.h>
#include <irq_func.h>
#include <asm/system.h>
#include <asm/io.h>

static void cache_flush(void);

int cleanup_before_linux (void)
{
	/*
	 * this function is called just before we call linux
	 * it prepares the processor for linux
	 *
	 * just disable everything that can disturb booting linux
	 */

	disable_interrupts();

	/* turn off I-cache */
	icache_disable();
	dcache_disable();

	/* flush I-cache */
	cache_flush();

	return (0);
}

/* flush I/D-cache */
static void cache_flush (void)
{
	unsigned long i = 0;

	asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
}

#define RST_BASE 0x90030000
#define RSRR	0x00
#define RCSR	0x04

__attribute__((noreturn)) void reset_cpu(void)
{
	/* repeat endlessly */
	while (1) {
		writel(0, RST_BASE + RCSR);
		writel(1, RST_BASE + RSRR);
	}
}