uboot-vybrid_public/cpu/sa1100/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 <common.h>
#include <command.h>

int cpu_init (void)
{
	/*
	 * setup up stack if necessary
	 */
#ifdef CONFIG_USE_IRQ
	IRQ_STACK_START = _armboot_end +
			CONFIG_STACKSIZE + CONFIG_STACKSIZE_IRQ - 4;
	FIQ_STACK_START = IRQ_STACK_START + CONFIG_STACKSIZE_FIQ;
	_armboot_real_end = FIQ_STACK_START + 4;
#else
	_armboot_real_end = _armboot_end + CONFIG_STACKSIZE;
#endif
	return (0);
}

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
	 */

	unsigned long i;

	disable_interrupts ();

	/* turn off I-cache */
	asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
	i &= ~0x1000;
	asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));

	/* flush I-cache */
	asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));

	return (0);
}

int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
	extern void reset_cpu (ulong addr);

	printf ("resetting ...\n");

	udelay (50000);				/* wait 50 ms */
	disable_interrupts ();
	reset_cpu (0);

	/*NOTREACHED*/
	return (0);
}

/* taken from blob */
void icache_enable (void)
{
	register u32 i;

	/* read control register */
	asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));

	/* set i-cache */
	i |= 0x1000;

	/* write back to control register */
	asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
}

void icache_disable (void)
{
	register u32 i;

	/* read control register */
	asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));

	/* clear i-cache */
	i &= ~0x1000;

	/* write back to control register */
	asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));

	/* flush i-cache */
	asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
}

int icache_status (void)
{
	register u32 i;

	/* read control register */
	asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));

	/* return bit */
	return (i & 0x1000);
}

/* we will never enable dcache, because we have to setup MMU first */
void dcache_enable (void)
{
	return;
}

void dcache_disable (void)
{
	return;
}

int dcache_status (void)
{
	return 0;					/* always off */
}