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

/*
 * (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>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/*
 * CPU specific code
 */

#include <asm/arch/pxa-regs.h>
#include <asm/io.h>
#include <asm/system.h>
#include <command.h>
#include <common.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));
}

#ifndef CONFIG_CPU_MONAHANS
void set_GPIO_mode(int gpio_mode)
{
	int gpio = gpio_mode & GPIO_MD_MASK_NR;
	int fn = (gpio_mode & GPIO_MD_MASK_FN) >> 8;
	int val;

	/* This below changes direction setting of GPIO "gpio" */
	val = readl(GPDR(gpio));

	if (gpio_mode & GPIO_MD_MASK_DIR)
		val |= GPIO_bit(gpio);
	else
		val &= ~GPIO_bit(gpio);

	writel(val, GPDR(gpio));

	/* This below updates only AF of GPIO "gpio" */
	val = readl(GAFR(gpio));
	val &= ~(0x3 << (((gpio) & 0xf) * 2));
	val |= fn << (((gpio) & 0xf) * 2);
	writel(val, GAFR(gpio));
}
#endif /* CONFIG_CPU_MONAHANS */