mem_tx4927.c

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/*
 * common tx4927 memory interface
 *
 * Author: MontaVista Software, Inc.
 *         [email protected]
 *
 * Copyright 2001-2002 MontaVista Software Inc.
 *
 *  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/types.h>
#include <linux/io.h>
#include <asm/txx9/tx4927.h>

static unsigned int __init tx4927_process_sdccr(u64 __iomem *addr)
{
    u64 val;
    unsigned int sdccr_ce;
    unsigned int sdccr_bs;
    unsigned int sdccr_rs;
    unsigned int sdccr_cs;
    unsigned int sdccr_mw;
    unsigned int bs = 0;
    unsigned int rs = 0;
    unsigned int cs = 0;
    unsigned int mw = 0;

    val = __raw_readq(addr);

    /* MVMCP -- need #defs for these bits masks */
    sdccr_ce = ((val & (1 << 10)) >> 10);
    sdccr_bs = ((val & (1 << 8)) >> 8);
    sdccr_rs = ((val & (3 << 5)) >> 5);
    sdccr_cs = ((val & (7 << 2)) >> 2);
    sdccr_mw = ((val & (1 << 0)) >> 0);

    if (sdccr_ce) {
        bs = 2 << sdccr_bs;
        rs = 2048 << sdccr_rs;
        cs = 256 << sdccr_cs;
        mw = 8 >> sdccr_mw;
    }

    return rs * cs * mw * bs;
}

unsigned int __init tx4927_get_mem_size(void)
{
    unsigned int total = 0;
    int i;

    for (i = 0; i < ARRAY_SIZE(tx4927_sdramcptr->cr); i++)
        total += tx4927_process_sdccr(&tx4927_sdramcptr->cr[i]);
    return total;
}