72d6668a1a4f8474aaf206c2499a0d84782cdbb9
[openwrt/staging/lynxis/omap.git] / target / linux / ar7 / files / arch / mips / ar7 / memory.c
1 /*
2 * Based on arch/mips/mm/init.c
3 * Copyright (C) 1994 - 2000 Ralf Baechle
4 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
5 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
6 * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22 #include <linux/bootmem.h>
23 #include <linux/init.h>
24 #include <linux/mm.h>
25 #include <linux/module.h>
26 #include <linux/pfn.h>
27 #include <linux/proc_fs.h>
28 #include <linux/string.h>
29 #include <linux/swap.h>
30
31 #include <asm/bootinfo.h>
32 #include <asm/page.h>
33 #include <asm/sections.h>
34
35 #include <asm/mips-boards/prom.h>
36
37 static int __init memsize(void)
38 {
39 u32 size = (64 << 20);
40 volatile u32 *addr = (u32 *)KSEG1ADDR(0x14000000 + size - 4);
41 u32 *kernel_end = (u32 *)KSEG1ADDR(CPHYSADDR((u32)&_end));
42
43 while (addr > kernel_end) {
44 *addr = (u32)addr;
45 size >>= 1;
46 addr -= size >> 2;
47 }
48
49 do {
50 addr += size >> 2;
51 if (*addr != (u32)addr)
52 break;
53 size <<= 1;
54 } while (size < (64 << 20));
55
56 return size;
57 }
58
59 void __init prom_meminit(void)
60 {
61 unsigned long pages;
62
63 pages = memsize() >> PAGE_SHIFT;
64 add_memory_region(PHYS_OFFSET, pages << PAGE_SHIFT,
65 BOOT_MEM_RAM);
66 }
67
68 void __init prom_free_prom_memory(void)
69 {
70 return;
71 }