arch/ppc/syslib/ibm440sp_common.c

   1 /*
   2  * arch/ppc/syslib/ibm440sp_common.c
   3  *
   4  * PPC440SP system library
   5  *
   6  * Matt Porter <mporter@kernel.crashing.org>
   7  * Copyright 2002-2005 MontaVista Software Inc.
   8  *
   9  * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
  10  * Copyright (c) 2003, 2004 Zultys Technologies
  11  *
  12  * This program is free software; you can redistribute  it and/or modify it
  13  * under  the terms of  the GNU General  Public License as published by the
  14  * Free Software Foundation;  either version 2 of the  License, or (at your
  15  * option) any later version.
  16  *
  17  */
  18 #include <linux/config.h>
  19 #include <linux/types.h>
  20 #include <linux/serial.h>
  21
  22 #include <asm/param.h>
  23 #include <asm/ibm44x.h>
  24 #include <asm/mmu.h>
  25 #include <asm/machdep.h>
  26 #include <asm/time.h>
  27 #include <asm/ppc4xx_pic.h>
  28
  29 /*
  30  * Read the 440SP memory controller to get size of system memory.
  31  */
  32 unsigned long __init ibm440sp_find_end_of_memory(void)
  33 {
  34         u32 i;
  35         u32 mem_size = 0;
  36
  37         /* Read two bank sizes and sum */
  38         for (i=0; i<2; i++)
  39                 switch (mfdcr(DCRN_MQ0_BS0BAS + i) & MQ0_CONFIG_SIZE_MASK) {
  40                         case MQ0_CONFIG_SIZE_8M:
  41                                 mem_size += PPC44x_MEM_SIZE_8M;
  42                                 break;
  43                         case MQ0_CONFIG_SIZE_16M:
  44                                 mem_size += PPC44x_MEM_SIZE_16M;
  45                                 break;
  46                         case MQ0_CONFIG_SIZE_32M:
  47                                 mem_size += PPC44x_MEM_SIZE_32M;
  48                                 break;
  49                         case MQ0_CONFIG_SIZE_64M:
  50                                 mem_size += PPC44x_MEM_SIZE_64M;
  51                                 break;
  52                         case MQ0_CONFIG_SIZE_128M:
  53                                 mem_size += PPC44x_MEM_SIZE_128M;
  54                                 break;
  55                         case MQ0_CONFIG_SIZE_256M:
  56                                 mem_size += PPC44x_MEM_SIZE_256M;
  57                                 break;
  58                         case MQ0_CONFIG_SIZE_512M:
  59                                 mem_size += PPC44x_MEM_SIZE_512M;
  60                                 break;
  61                         case MQ0_CONFIG_SIZE_1G:
  62                                 mem_size += PPC44x_MEM_SIZE_1G;
  63                                 break;
  64                         case MQ0_CONFIG_SIZE_2G:
  65                                 mem_size += PPC44x_MEM_SIZE_2G;
  66                                 break;
  67                         default:
  68                                 break;
  69                 }
  70         return mem_size;
  71 }