memory.c

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/*
 * Copyright (C) 2007 Felix Fietkau <[email protected]>
 * Copyright (C) 2007 Eugene Konev <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include <linux/bootmem.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/pfn.h>
#include <linux/proc_fs.h>
#include <linux/string.h>
#include <linux/swap.h>

#include <asm/bootinfo.h>
#include <asm/page.h>
#include <asm/sections.h>

#include <asm/mach-ar7/ar7.h>
#include <asm/mips-boards/prom.h>

static int __init memsize(void)
{
    u32 size = (64 << 20);
    u32 *addr = (u32 *)KSEG1ADDR(AR7_SDRAM_BASE + size - 4);
    u32 *kernel_end = (u32 *)KSEG1ADDR(CPHYSADDR((u32)&_end));
    u32 *tmpaddr = addr;

    while (tmpaddr > kernel_end) {
        *tmpaddr = (u32)tmpaddr;
        size >>= 1;
        tmpaddr -= size >> 2;
    }

    do {
        tmpaddr += size >> 2;
        if (*tmpaddr != (u32)tmpaddr)
            break;
        size <<= 1;
    } while (size < (64 << 20));

    writel((u32)tmpaddr, &addr);

    return size;
}

void __init prom_meminit(void)
{
    unsigned long pages;

    pages = memsize() >> PAGE_SHIFT;
    add_memory_region(PHYS_OFFSET, pages << PAGE_SHIFT, BOOT_MEM_RAM);
}

void __init prom_free_prom_memory(void)
{
    /* Nothing to free */
}