1/*
2 * Copyright (C) 2012 ARM Ltd.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
15 */
16#ifndef __ASM_CACHE_H
17#define __ASM_CACHE_H
18
19#include <asm/cachetype.h>
20
21#define L1_CACHE_SHIFT		7
22#define L1_CACHE_BYTES		(1 << L1_CACHE_SHIFT)
23
24/*
25 * Memory returned by kmalloc() may be used for DMA, so we must make
26 * sure that all such allocations are cache aligned. Otherwise,
27 * unrelated code may cause parts of the buffer to be read into the
28 * cache before the transfer is done, causing old data to be seen by
29 * the CPU.
30 */
31#define ARCH_DMA_MINALIGN	L1_CACHE_BYTES
32
33#ifndef __ASSEMBLY__
34
35#define __read_mostly __attribute__((__section__(".data..read_mostly")))
36
37static inline int cache_line_size(void)
38{
39	u32 cwg = cache_type_cwg();
40	return cwg ? 4 << cwg : L1_CACHE_BYTES;
41}
42
43#endif	/* __ASSEMBLY__ */
44
45#endif
46