linux-vybrid_public/arch/mips/alchemy/devboards/prom.c

/*
 * Common code used by all Alchemy develboards.
 *
 * Extracted from files which had this to say:
 *
 * Copyright 2000, 2008 MontaVista Software Inc.
 * Author: MontaVista Software, Inc. <source@mvista.com>
 *
 *  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  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  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.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <asm/bootinfo.h>
#include <asm/mach-au1x00/au1000.h>
#include <prom.h>

#if defined(CONFIG_MIPS_PB1000) || defined(CONFIG_MIPS_DB1000) || \
    defined(CONFIG_MIPS_PB1100) || defined(CONFIG_MIPS_DB1100) || \
    defined(CONFIG_MIPS_PB1500) || defined(CONFIG_MIPS_DB1500) || \
    defined(CONFIG_MIPS_BOSPORUS) || defined(CONFIG_MIPS_MIRAGE)
#define ALCHEMY_BOARD_DEFAULT_MEMSIZE	0x04000000

#else	/* Au1550/Au1200-based develboards */
#define ALCHEMY_BOARD_DEFAULT_MEMSIZE	0x08000000
#endif

void __init prom_init(void)
{
	unsigned char *memsize_str;
	unsigned long memsize;

	prom_argc = (int)fw_arg0;
	prom_argv = (char **)fw_arg1;
	prom_envp = (char **)fw_arg2;

	prom_init_cmdline();
	memsize_str = prom_getenv("memsize");
	if (!memsize_str)
		memsize = ALCHEMY_BOARD_DEFAULT_MEMSIZE;
	else
		strict_strtoul(memsize_str, 0, &memsize);
	add_memory_region(0, memsize, BOOT_MEM_RAM);
}