target/linux/adm5120-2.6/files/arch/mips/adm5120/memory.c

   1 /*****************************************************************************
   2  * Carsten Langgaard, carstenl@mips.com
   3  * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
   4  * Copyright (C) 2003 ADMtek Incorporated.
   5  *      daniell@admtek.com.tw
   6  * Copyright (C) 2005 Jeroen Vreeken (pe1rxq@amsat.org)
   7  *
   8  * ########################################################################
   9  *
  10  *  This program is free software; you can distribute it and/or modify it
  11  *  under the terms of the GNU General Public License (Version 2) as
  12  *  published by the Free Software Foundation.
  13  *
  14  *  This program is distributed in the hope it will be useful, but WITHOUT
  15  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17  *  for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * ########################################################################
  24  *
  25  *****************************************************************************/
  26
  27 #include <linux/autoconf.h>
  28 #include <linux/init.h>
  29 #include <linux/mm.h>
  30 #include <linux/bootmem.h>
  31 #include <linux/pfn.h>
  32 #include <linux/string.h>
  33
  34 #include <asm/bootinfo.h>
  35 #include <asm/page.h>
  36 #include <asm/sections.h>
  37
  38 #include <asm/mach-adm5120/adm5120_info.h>
  39 #include <asm-mips/mips-boards/prom.h>
  40
  41 #define PFN_ALIGN(x)    (((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK)
  42
  43 struct prom_pmemblock mdesc[PROM_MAX_PMEMBLOCKS];
  44
  45 struct prom_pmemblock * __init prom_getmdesc(void)
  46 {
  47         unsigned int memsize;
  48         char cmdline[CL_SIZE], *ptr;
  49
  50         memsize = adm5120_memsize;
  51         /* Check the command line for a memsize directive that overrides
  52          * the physical/default amount */
  53         strcpy(cmdline, arcs_cmdline);
  54         ptr = strstr(cmdline, "memsize=");
  55         if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
  56         ptr = strstr(ptr, " memsize=");
  57
  58         if (ptr)
  59                 memsize = memparse(ptr + 8, &ptr);
  60
  61         memset(mdesc, 0, sizeof(mdesc));
  62         mdesc[0].type = BOOT_MEM_RAM;
  63         mdesc[0].base = CPHYSADDR(PFN_ALIGN(&_end));
  64         mdesc[0].size = memsize - mdesc[0].base;
  65
  66         return &mdesc[0];
  67 }
  68
  69 void __init prom_meminit(void)
  70 {
  71         struct prom_pmemblock *p;
  72
  73         p = prom_getmdesc();
  74
  75         while (p->size)
  76         {
  77                 long type;
  78                 unsigned long base, size;
  79                 base = p->base;
  80                 type = p->type,
  81                 size = p->size;
  82                 add_memory_region(base, size, type);
  83                 p++;
  84         }
  85 }
  86
  87 void __init prom_free_prom_memory(void)
  88 {
  89         /* We do not have to prom memory to free */
  90 }