arch/mips/txx9/generic/mem_tx4927.c

   1 /*
   2  * linux/arch/mips/txx9/generic/mem_tx4927.c
   3  *
   4  * common tx4927 memory interface
   5  *
   6  * Author: MontaVista Software, Inc.
   7  *         source@mvista.com
   8  *
   9  * Copyright 2001-2002 MontaVista Software Inc.
  10  *
  11  *  This program is free software; you can redistribute it and/or modify it
  12  *  under the terms of the GNU General Public License as published by the
  13  *  Free Software Foundation; either version 2 of the License, or (at your
  14  *  option) any later version.
  15  *
  16  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  17  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  18  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  21  *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
  22  *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  23  *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  24  *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
  25  *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  *
  27  *  You should have received a copy of the GNU General Public License along
  28  *  with this program; if not, write to the Free Software Foundation, Inc.,
  29  *  675 Mass Ave, Cambridge, MA 02139, USA.
  30  */
  31
  32 #include <linux/init.h>
  33 #include <linux/types.h>
  34 #include <linux/io.h>
  35 #include <asm/txx9/tx4927.h>
  36
  37 static unsigned int __init tx4927_process_sdccr(u64 __iomem *addr)
  38 {
  39         u64 val;
  40         unsigned int sdccr_ce;
  41         unsigned int sdccr_bs;
  42         unsigned int sdccr_rs;
  43         unsigned int sdccr_cs;
  44         unsigned int sdccr_mw;
  45         unsigned int bs = 0;
  46         unsigned int rs = 0;
  47         unsigned int cs = 0;
  48         unsigned int mw = 0;
  49
  50         val = __raw_readq(addr);
  51
  52         /* MVMCP -- need #defs for these bits masks */
  53         sdccr_ce = ((val & (1 << 10)) >> 10);
  54         sdccr_bs = ((val & (1 << 8)) >> 8);
  55         sdccr_rs = ((val & (3 << 5)) >> 5);
  56         sdccr_cs = ((val & (7 << 2)) >> 2);
  57         sdccr_mw = ((val & (1 << 0)) >> 0);
  58
  59         if (sdccr_ce) {
  60                 bs = 2 << sdccr_bs;
  61                 rs = 2048 << sdccr_rs;
  62                 cs = 256 << sdccr_cs;
  63                 mw = 8 >> sdccr_mw;
  64         }
  65
  66         return rs * cs * mw * bs;
  67 }
  68
  69 unsigned int __init tx4927_get_mem_size(void)
  70 {
  71         unsigned int total = 0;
  72         int i;
  73
  74         for (i = 0; i < ARRAY_SIZE(tx4927_sdramcptr->cr); i++)
  75                 total += tx4927_process_sdccr(&tx4927_sdramcptr->cr[i]);
  76         return total;
  77 }