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tx4927_prom.c

/*
 * linux/arch/mips/tx4927/common/tx4927_prom.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/mm.h>
#include <linux/sched.h>
#include <linux/bootmem.h>

#include <asm/addrspace.h>
#include <asm/bootinfo.h>
#include <asm/tx4927/tx4927.h>

static unsigned int __init tx4927_process_sdccr(unsigned long 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;
      unsigned int msize = 0;

      val = __raw_readq((void __iomem *)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 & (3 << 2)) >> 2);
      sdccr_mw = ((val & (1 << 0)) >> 0);

      if (sdccr_ce) {
            switch (sdccr_bs) {
            case 0:{
                        bs = 2;
                        break;
                  }
            case 1:{
                        bs = 4;
                        break;
                  }
            }
            switch (sdccr_rs) {
            case 0:{
                        rs = 2048;
                        break;
                  }
            case 1:{
                        rs = 4096;
                        break;
                  }
            case 2:{
                        rs = 8192;
                        break;
                  }
            case 3:{
                        rs = 0;
                        break;
                  }
            }
            switch (sdccr_cs) {
            case 0:{
                        cs = 256;
                        break;
                  }
            case 1:{
                        cs = 512;
                        break;
                  }
            case 2:{
                        cs = 1024;
                        break;
                  }
            case 3:{
                        cs = 2048;
                        break;
                  }
            }
            switch (sdccr_mw) {
            case 0:{
                        mw = 8;
                        break;
                  }     /* 8 bytes = 64 bits */
            case 1:{
                        mw = 4;
                        break;
                  }     /* 4 bytes = 32 bits */
            }
      }

      /*            bytes per chip     MB per chip      num chips */
      msize = (((rs * cs * mw) / (1024 * 1024)) * bs);

      return (msize);
}


unsigned int __init tx4927_get_mem_size(void)
{
      unsigned int c0;
      unsigned int c1;
      unsigned int c2;
      unsigned int c3;
      unsigned int total;

      /* MVMCP -- need #defs for these registers */
      c0 = tx4927_process_sdccr(0xff1f8000);
      c1 = tx4927_process_sdccr(0xff1f8008);
      c2 = tx4927_process_sdccr(0xff1f8010);
      c3 = tx4927_process_sdccr(0xff1f8018);
      total = c0 + c1 + c2 + c3;

      return (total);
}

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