LXR linux/arch/mips/ar7/memory.c

   1/*
   2 * Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
   3 * Copyright (C) 2007 Eugene Konev <ejka@openwrt.org>
   4 *
   5 * This program is free software; you can redistribute it and/or modify
   6 * it under the terms of the GNU General Public License as published by
   7 * the Free Software Foundation; either version 2 of the License, or
   8 * (at your option) any later version.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, write to the Free Software
  17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18 */
  19#include <linux/bootmem.h>
  20#include <linux/init.h>
  21#include <linux/mm.h>
  22#include <linux/module.h>
  23#include <linux/pfn.h>
  24#include <linux/proc_fs.h>
  25#include <linux/string.h>
  26#include <linux/swap.h>
  27
  28#include <asm/bootinfo.h>
  29#include <asm/page.h>
  30#include <asm/sections.h>
  31
  32#include <asm/mach-ar7/ar7.h>
  33
  34static int __init memsize(void)
  35{
  36        u32 size = (64 << 20);
  37        u32 *addr = (u32 *)KSEG1ADDR(AR7_SDRAM_BASE + size - 4);
  38        u32 *kernel_end = (u32 *)KSEG1ADDR(CPHYSADDR((u32)&_end));
  39        u32 *tmpaddr = addr;
  40
  41        while (tmpaddr > kernel_end) {
  42                *tmpaddr = (u32)tmpaddr;
  43                size >>= 1;
  44                tmpaddr -= size >> 2;
  45        }
  46
  47        do {
  48                tmpaddr += size >> 2;
  49                if (*tmpaddr != (u32)tmpaddr)
  50                        break;
  51                size <<= 1;
  52        } while (size < (64 << 20));
  53
  54        writel((u32)tmpaddr, &addr);
  55
  56        return size;
  57}
  58
  59void __init prom_meminit(void)
  60{
  61        unsigned long pages;
  62
  63        pages = memsize() >> PAGE_SHIFT;
  64        add_memory_region(PHYS_OFFSET, pages << PAGE_SHIFT, BOOT_MEM_RAM);
  65}
  66
  67void __init prom_free_prom_memory(void)
  68{
  69        /* Nothing to free */
  70}
  71