LXR linux/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
  22static fw_memblock_t mdesc[FW_MAX_MEMBLOCKS];
  23
  24/* determined physical memory size, not overridden by command line args  */
  25unsigned long physical_memsize = 0L;
  26
  27fw_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
  96static 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
 108void __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
 127void __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}
 141