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mem_tx4927.c

/*
 * linux/arch/mips/txx9/generic/mem_tx4927.c
 *
 * common tx4927 memory interface
 *
 * Author: MontaVista Software, Inc.
 *         source@mvista.com
 *
 * 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;
}

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