arch/mips/mti-malta/malta-memory.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * PROM library functions for acquiring/using memory descriptors given to
   7  * us from the YAMON.
   8  *
   9  * Copyright (C) 1999,2000,2012  MIPS Technologies, Inc.
  10  * All rights reserved.
  11  * Authors: Carsten Langgaard <carstenl@mips.com>
  12  *          Steven J. Hill <sjhill@mips.com>
  13  */
  14 #include <linux/init.h>
  15 #include <linux/bootmem.h>
  16 #include <linux/string.h>
  17
  18 #include <asm/bootinfo.h>
  19 #include <asm/sections.h>
  20 #include <asm/fw/fw.h>
  21
  22 static fw_memblock_t mdesc[FW_MAX_MEMBLOCKS];
  23
  24 /* determined physical memory size, not overridden by command line args  */
  25 unsigned long physical_memsize = 0L;
  26
  27 fw_memblock_t * __init fw_getmdesc(void)
  28 {
  29         char *memsize_str, *ptr;
  30         unsigned int memsize;
  31         static char cmdline[COMMAND_LINE_SIZE] __initdata;
  32         long val;
  33         int tmp;
  34
  35         /* otherwise look in the environment */
  36         memsize_str = fw_getenv("memsize");
  37         if (!memsize_str) {
  38                 pr_warn("memsize not set in YAMON, set to default (32Mb)\n");
  39                 physical_memsize = 0x02000000;
  40         } else {
  41                 tmp = kstrtol(memsize_str, 0, &val);
  42                 physical_memsize = (unsigned long)val;
  43         }
  44
  45 #ifdef CONFIG_CPU_BIG_ENDIAN
  46         /* SOC-it swaps, or perhaps doesn't swap, when DMA'ing the last
  47            word of physical memory */
  48         physical_memsize -= PAGE_SIZE;
  49 #endif
  50
  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         else
  61                 memsize = physical_memsize;
  62
  63         memset(mdesc, 0, sizeof(mdesc));
  64
  65         mdesc[0].type = fw_dontuse;
  66         mdesc[0].base = 0x00000000;
  67         mdesc[0].size = 0x00001000;
  68
  69         mdesc[1].type = fw_code;
  70         mdesc[1].base = 0x00001000;
  71         mdesc[1].size = 0x000ef000;
  72
  73         /*
  74          * The area 0x000f0000-0x000fffff is allocated for BIOS memory by the
  75          * south bridge and PCI access always forwarded to the ISA Bus and
  76          * BIOSCS# is always generated.
  77          * This mean that this area can't be used as DMA memory for PCI
  78          * devices.
  79          */
  80         mdesc[2].type = fw_dontuse;
  81         mdesc[2].base = 0x000f0000;
  82         mdesc[2].size = 0x00010000;
  83
  84         mdesc[3].type = fw_dontuse;
  85         mdesc[3].base = 0x00100000;
  86         mdesc[3].size = CPHYSADDR(PFN_ALIGN((unsigned long)&_end)) -
  87                 mdesc[3].base;
  88
  89         mdesc[4].type = fw_free;
  90         mdesc[4].base = CPHYSADDR(PFN_ALIGN(&_end));
  91         mdesc[4].size = memsize - mdesc[4].base;
  92
  93         return &mdesc[0];
  94 }
  95
  96 static int __init fw_memtype_classify(unsigned int type)
  97 {
  98         switch (type) {
  99         case fw_free:
 100                 return BOOT_MEM_RAM;
 101         case fw_code:
 102                 return BOOT_MEM_ROM_DATA;
 103         default:
 104                 return BOOT_MEM_RESERVED;
 105         }
 106 }
 107
 108 void __init fw_meminit(void)
 109 {
 110         fw_memblock_t *p;
 111
 112         p = fw_getmdesc();
 113
 114         while (p->size) {
 115                 long type;
 116                 unsigned long base, size;
 117
 118                 type = fw_memtype_classify(p->type);
 119                 base = p->base;
 120                 size = p->size;
 121
 122                 add_memory_region(base, size, type);
 123                 p++;
 124         }
 125 }
 126
 127 void __init prom_free_prom_memory(void)
 128 {
 129         unsigned long addr;
 130         int i;
 131
 132         for (i = 0; i < boot_mem_map.nr_map; i++) {
 133                 if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
 134                         continue;
 135
 136                 addr = boot_mem_map.map[i].addr;
 137                 free_init_pages("YAMON memory",
 138                                 addr, addr + boot_mem_map.map[i].size);
 139         }
 140 }