1/*
2 *  linux/include/asm-arm/arch-mx1ads/memory.h
3 *
4 *  Copyright (C) 1999 ARM Limited
5 *  Copyright (C) 2002 Shane Nay (shane@minirl.com)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20 */
21#ifndef __ASM_ARCH_MMU_H
22#define __ASM_ARCH_MMU_H
23
24/*
25 * Task size: 3GB
26 */
27#define TASK_SIZE	(0xc0000000UL)
28#define TASK_SIZE_26	(0x04000000UL)
29
30/*
31 * This decides where the kernel will search for a free chunk of vm
32 * space during mmap's.
33 */
34#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
35
36/*
37 * Page offset: 3GB
38 */
39/* Note
40 * This should be hot-swapable with a CONFIG_MX1ADS_SDRAM
41 * or something similar, so we can swap between SRAM and
42 * SDRAM running kernel.
43 */
44
45#ifdef CONFIG_ARCH_MX1ADS_SRAM
46#define PAGE_OFFSET	(0xc0000000UL)
47#define PHYS_OFFSET	(0x12000000UL)
48#else
49#define PAGE_OFFSET	(0xc0000000UL)
50#define PHYS_OFFSET	(0x08000000UL)
51#endif
52
53/*
54 * On mx1, the sdram/sram is contiguous
55 */
56#define __virt_to_phys__is_a_macro
57#define __virt_to_phys(vpage) ((vpage) - PAGE_OFFSET + PHYS_OFFSET)
58#define __phys_to_virt__is_a_macro
59#define __phys_to_virt(ppage) ((ppage) + PAGE_OFFSET - PHYS_OFFSET)
60
61/*
62 * Virtual view <-> DMA view memory address translations
63 * virt_to_bus: Used to translate the virtual address to an
64 *              address suitable to be passed to set_dma_addr
65 * bus_to_virt: Used to convert an address for DMA operations
66 *              to an address that the kernel can use.
67 */
68#define __virt_to_bus__is_a_macro
69#define __virt_to_bus(x)	(x - PAGE_OFFSET +  PHYS_OFFSET)
70#define __bus_to_virt__is_a_macro
71#define __bus_to_virt(x)	(x -  PHYS_OFFSET + PAGE_OFFSET)
72
73#define PHYS_TO_NID(addr)	(0)
74
75#endif
76