arch/mips/txx9/generic/mem_tx4927.c

   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
  35 static 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
  67 unsigned 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 }