1/*
2 *  arch/arm/mach-realview/include/mach/memory.h
3 *
4 *  Copyright (C) 2003 ARM Limited
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19 */
20#ifndef __ASM_ARCH_MEMORY_H
21#define __ASM_ARCH_MEMORY_H
22
23#ifdef CONFIG_SPARSEMEM
24
25/*
26 * Sparsemem definitions for RealView PBX.
27 *
28 * The RealView PBX board has another block of 512MB of RAM at 0x20000000,
29 * however only the block at 0x70000000 (or the 256MB mirror at 0x00000000)
30 * may be used for DMA.
31 *
32 * The macros below define a section size of 256MB and a non-linear virtual to
33 * physical mapping:
34 *
35 * 256MB @ 0x00000000 -> PAGE_OFFSET
36 * 512MB @ 0x20000000 -> PAGE_OFFSET + 0x10000000
37 * 256MB @ 0x80000000 -> PAGE_OFFSET + 0x30000000
38 */
39#ifdef CONFIG_REALVIEW_HIGH_PHYS_OFFSET
40#error "SPARSEMEM not available with REALVIEW_HIGH_PHYS_OFFSET"
41#endif
42
43#define MAX_PHYSMEM_BITS	32
44#define SECTION_SIZE_BITS	28
45
46/* bank page offsets */
47#define PAGE_OFFSET1	(PAGE_OFFSET + 0x10000000)
48#define PAGE_OFFSET2	(PAGE_OFFSET + 0x30000000)
49
50#define PHYS_OFFSET PLAT_PHYS_OFFSET
51
52#define __phys_to_virt(phys)						\
53	((phys) >= 0x80000000 ?	(phys) - 0x80000000 + PAGE_OFFSET2 :	\
54	 (phys) >= 0x20000000 ?	(phys) - 0x20000000 + PAGE_OFFSET1 :	\
55	 (phys) + PAGE_OFFSET)
56
57#define __virt_to_phys(virt)						\
58	 ((virt) >= PAGE_OFFSET2 ? (virt) - PAGE_OFFSET2 + 0x80000000 :	\
59	  (virt) >= PAGE_OFFSET1 ? (virt) - PAGE_OFFSET1 + 0x20000000 :	\
60	  (virt) - PAGE_OFFSET)
61
62#endif	/* CONFIG_SPARSEMEM */
63
64#endif
65