LXR linux/arch/mips/txx9/generic/mem

   1/*
   2 * common tx4927 memory interface
   3 *
   4 * Author: MontaVista Software, Inc.
   5 *         source@mvista.com
   6 *
   7 * Copyright 2001-2002 MontaVista Software Inc.
   8 *
   9 *  This program is free software; you can redistribute it and/or modify it
  10 *  under the terms of the GNU General Public License as published by the
  11 *  Free Software Foundation; either version 2 of the License, or (at your
  12 *  option) any later version.
  13 *
  14 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  15 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  16 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17 *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  18 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  19 *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
  20 *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  21 *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  22 *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
  23 *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24 *
  25 *  You should have received a copy of the GNU General Public License along
  26 *  with this program; if not, write to the Free Software Foundation, Inc.,
  27 *  675 Mass Ave, Cambridge, MA 02139, USA.
  28 */
  29
  30#include <linux/init.h>
  31#include <linux/types.h>
  32#include <linux/io.h>
  33#include <asm/txx9/tx4927.h>
  34
  35static unsigned int __init tx4927_process_sdccr(u64 __iomem *addr)
  36{
  37        u64 val;
  38        unsigned int sdccr_ce;
  39        unsigned int sdccr_bs;
  40        unsigned int sdccr_rs;
  41        unsigned int sdccr_cs;
  42        unsigned int sdccr_mw;
  43        unsigned int bs = 0;
  44        unsigned int rs = 0;
  45        unsigned int cs = 0;
  46        unsigned int mw = 0;
  47
  48        val = __raw_readq(addr);
  49
  50        /* MVMCP -- need #defs for these bits masks */
  51        sdccr_ce = ((val & (1 << 10)) >> 10);
  52        sdccr_bs = ((val & (1 << 8)) >> 8);
  53        sdccr_rs = ((val & (3 << 5)) >> 5);
  54        sdccr_cs = ((val & (7 << 2)) >> 2);
  55        sdccr_mw = ((val & (1 << 0)) >> 0);
  56
  57        if (sdccr_ce) {
  58                bs = 2 << sdccr_bs;
  59                rs = 2048 << sdccr_rs;
  60                cs = 256 << sdccr_cs;
  61                mw = 8 >> sdccr_mw;
  62        }
  63
  64        return rs * cs * mw * bs;
  65}
  66
  67unsigned int __init tx4927_get_mem_size(void)
  68{
  69        unsigned int total = 0;
  70        int i;
  71
  72        for (i = 0; i < ARRAY_SIZE(tx4927_sdramcptr->cr); i++)
  73                total += tx4927_process_sdccr(&tx4927_sdramcptr->cr[i]);
  74        return total;
  75}
  76