Logo Search packages:      
Sourcecode: linux version File versions  Download package

prom.c

/*
 * linux/arch/mips/tx4938/common/prom.c
 *
 * common tx4938 memory interface
 * Copyright (C) 2000-2001 Toshiba Corporation
 *
 * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
 * terms of the GNU General Public License version 2. This program is
 * licensed "as is" without any warranty of any kind, whether express
 * or implied.
 *
 * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
 */

#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/tx4938/tx4938.h>

static unsigned int __init
tx4938_process_sdccr(u64 * addr)
{
      u64 val;
      unsigned int sdccr_ce;
      unsigned int sdccr_rs;
      unsigned int sdccr_cs;
      unsigned int sdccr_mw;
      unsigned int rs = 0;
      unsigned int cs = 0;
      unsigned int mw = 0;
      unsigned int bc = 4;
      unsigned int msize = 0;

      val = (*((vu64 *) (addr)));

      /* MVMCP -- need #defs for these bits masks */
      sdccr_ce = ((val & (1 << 10)) >> 10);
      sdccr_rs = ((val & (3 << 5)) >> 5);
      sdccr_cs = ((val & (7 << 2)) >> 2);
      sdccr_mw = ((val & (1 << 0)) >> 0);

      if (sdccr_ce) {
            switch (sdccr_rs) {
            case 0:{
                        rs = 2048;
                        break;
                  }
            case 1:{
                        rs = 4096;
                        break;
                  }
            case 2:{
                        rs = 8192;
                        break;
                  }
            default:{
                        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;
                  }
            case 4:{
                        cs = 4096;
                        break;
                  }
            default:{
                        cs = 0;
                        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          bank count */
      msize = (((rs * cs * mw) / (1024 * 1024)) * (bc));

      /* MVMCP -- bc hard coded to 4 from table 9.3.1     */
      /*          boad supports bc=2 but no way to detect */

      return (msize);
}

unsigned int __init
tx4938_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 = tx4938_process_sdccr((u64 *) 0xff1f8000);
      c1 = tx4938_process_sdccr((u64 *) 0xff1f8008);
      c2 = tx4938_process_sdccr((u64 *) 0xff1f8010);
      c3 = tx4938_process_sdccr((u64 *) 0xff1f8018);
      total = c0 + c1 + c2 + c3;

      return (total);
}

Generated by  Doxygen 1.6.0   Back to index