arch/powerpc/boot/44x.c

   1 /*
   2  * Copyright 2007 David Gibson, IBM Corporation.
   3  *
   4  * Based on earlier code:
   5  *   Matt Porter <mporter@kernel.crashing.org>
   6  *   Copyright 2002-2005 MontaVista Software Inc.
   7  *
   8  *   Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
   9  *   Copyright (c) 2003, 2004 Zultys Technologies
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version
  14  * 2 of the License, or (at your option) any later version.
  15  */
  16 #include <stddef.h>
  17 #include "types.h"
  18 #include "string.h"
  19 #include "stdio.h"
  20 #include "ops.h"
  21 #include "reg.h"
  22 #include "dcr.h"
  23
  24 /* Read the 44x memory controller to get size of system memory. */
  25 void ibm44x_fixup_memsize(void)
  26 {
  27         int i;
  28         unsigned long memsize, bank_config;
  29
  30         memsize = 0;
  31         for (i = 0; i < ARRAY_SIZE(sdram_bxcr); i++) {
  32                 mtdcr(DCRN_SDRAM0_CFGADDR, sdram_bxcr[i]);
  33                 bank_config = mfdcr(DCRN_SDRAM0_CFGDATA);
  34
  35                 if (bank_config & SDRAM_CONFIG_BANK_ENABLE)
  36                         memsize += SDRAM_CONFIG_BANK_SIZE(bank_config);
  37         }
  38
  39         dt_fixup_memory(0, memsize);
  40 }