barebox/arch/arm/mach-omap/am33xx_generic.c

/*
 * (C) Copyright 2012 Teresa Gámez, Phytec Messtechnik GmbH
 * (C) Copyright 2012 Jan Luebbe <j.luebbe@pengutronix.de>
 *
 * 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
 */

#include <io.h>
#include <mach/am33xx-silicon.h>
#include <mach/am33xx-clock.h>
#include <mach/sys_info.h>
#include <mach/xload.h>

void __noreturn reset_cpu(unsigned long addr)
{
	writel(AM33XX_PRM_RSTCTRL_RESET, AM33XX_PRM_RSTCTRL);

	while (1);
}

/**
 * @brief Get the upper address of current execution
 *
 * we can use this to figure out if we are running in SRAM /
 * XIP Flash or in SDRAM
 *
 * @return base address
 */
u32 get_base(void)
{
	u32 val;
	__asm__ __volatile__("mov %0, pc \n":"=r"(val)::"memory");
	val &= 0xF0000000;
	val >>= 28;
	return val;
}

/**
 * @brief Are we running in Flash XIP?
 *
 * If the base is in GPMC address space, we probably are!
 *
 * @return 1 if we are running in XIP mode, else return 0
 */
u32 running_in_flash(void)
{
	if (get_base() < 4)
		return 1;	/* in flash */
	return 0;		/* running in SRAM or SDRAM */
}

/**
 * @brief Are we running in OMAP internal SRAM?
 *
 * If in SRAM address, then yes!
 *
 * @return  1 if we are running in SRAM, else return 0
 */
u32 running_in_sram(void)
{
	if (get_base() == 4)
		return 1;	/* in SRAM */
	return 0;		/* running in FLASH or SDRAM */
}

/**
 * @brief Are we running in SDRAM?
 *
 * if we are not in GPMC nor in SRAM address space,
 * we are in SDRAM execution area
 *
 * @return 1 if we are running from SDRAM, else return 0
 */
u32 running_in_sdram(void)
{
	if (get_base() > 4)
		return 1;	/* in sdram */
	return 0;		/* running in SRAM or FLASH */
}

enum omap_boot_src am33xx_bootsrc(void)
{
	return OMAP_BOOTSRC_MMC1; /* only MMC for now */
}