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-mips/mips-boards/prom.h>
  39
  40 extern char *prom_getenv(char *envname);
  41 void prom_printf(char *, ...);
  42
  43 #define PFN_ALIGN(x)    (((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK)
  44
  45 #define ADM5120_MEMCTRL                 0x1200001c
  46 #define ADM5120_MEMCTRL_SDRAM_MASK      0x7
  47
  48 static const unsigned long adm_sdramsize[] __initdata = {
  49         0x0,            /* Reserved */
  50         0x0400000,      /* 4Mb */
  51         0x0800000,      /* 8Mb */
  52         0x1000000,      /* 16Mb */
  53         0x4000000,      /* 64Mb */
  54         0x8000000,      /* 128Mb */
  55 };
  56
  57 /* determined physical memory size, not overridden by command line args  */
  58 unsigned long physical_memsize = 0L;
  59
  60 struct prom_pmemblock mdesc[PROM_MAX_PMEMBLOCKS];
  61
  62 struct prom_pmemblock * __init prom_getmdesc(void)
  63 {
  64         char *memsize_str;
  65         unsigned int memsize;
  66         char cmdline[CL_SIZE], *ptr;
  67
  68         memsize_str = prom_getenv("memsize");
  69
  70         if (!memsize_str)
  71         {
  72                 prom_printf("memsize not set in boot prom, set to default (8Mb)\n");
  73                 physical_memsize = 0x00800000;
  74         }
  75         else
  76 #ifdef DEBUG
  77                 prom_printf("prom_memsize = %s\n", memsize_str);
  78 #endif
  79                 physical_memsize = simple_strtol(memsize_str, NULL, 0);
  80
  81         /* Check the command line for a memsize directive that overrides
  82          * the physical/default amount */
  83         strcpy(cmdline, arcs_cmdline);
  84         ptr = strstr(cmdline, "memsize=");
  85         if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
  86         ptr = strstr(ptr, " memsize=");
  87
  88         if (ptr)
  89                 memsize = memparse(ptr + 8, &ptr);
  90         else
  91                 memsize = physical_memsize;
  92
  93        memset(mdesc, 0, sizeof(mdesc));
  94
  95        mdesc[0].type = BOOT_MEM_RAM;
  96        mdesc[0].base = CPHYSADDR(PFN_ALIGN(&_end));
  97        mdesc[0].size = memsize - mdesc[0].base;
  98
  99        return &mdesc[0];
 100 }
 101
 102 void __init prom_meminit(void)
 103 {
 104         struct prom_pmemblock *p;
 105
 106         p = prom_getmdesc();
 107
 108         while (p->size)
 109         {
 110                 long type;
 111                 unsigned long base, size;
 112                 base = p->base;
 113                 type = p->type,
 114                 size = p->size;
 115                 add_memory_region(base, size, type);
 116                 p++;
 117         }
 118 }
 119
 120 #if 0
 121 void __init prom_meminit(void)
 122 {
 123         unsigned long base = CPHYSADDR(PFN_ALIGN(&_end));
 124         unsigned long size;
 125
 126         u32 memctrl = *(u32*)KSEG1ADDR(ADM5120_MEMCTRL);
 127         size = adm_sdramsize[memctrl & ADM5120_MEMCTRL_SDRAM_MASK];
 128         add_memory_region(base, size-base, BOOT_MEM_RAM);
 129 }
 130 #endif
 131
 132 void __init prom_free_prom_memory(void)
 133 {
 134         /* We do not have to prom memory to free */
 135 }