release/src-rt-6.x/linux/linux-2.6/arch/ppc/boot/simple/cpc700_memory.c

   1 /*
   2  * Find memory based upon settings in the CPC700 bridge
   3  *
   4  * Author: Dan Cox
   5  *
   6  * 2001-2002 (c) MontaVista, Software, Inc.  This file is licensed under
   7  * the terms of the GNU General Public License version 2.  This program
   8  * is licensed "as is" without any warranty of any kind, whether express
   9  * or implied.
  10  */
  11
  12 #include <asm/types.h>
  13 #include <asm/io.h>
  14 #include "cpc700.h"
  15
  16 unsigned long
  17 cpc700_get_mem_size(void)
  18 {
  19         int i;
  20         unsigned long len, amt;
  21
  22         /* Start at MB1EA, since MB0EA will most likely be the ending address
  23            for ROM space. */
  24         for(len = 0, i = CPC700_MB1EA; i <= CPC700_MB4EA; i+=4) {
  25                 amt = cpc700_read_memreg(i);
  26                 if (amt == 0)
  27                         break;
  28                 len = amt;
  29         }
  30
  31         return len;
  32 }
  33
  34