Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1/*
2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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
9#ifndef __ARC_ASM_CACHE_H
10#define __ARC_ASM_CACHE_H
11
12/* In case $$ not config, setup a dummy number for rest of kernel */
13#ifndef CONFIG_ARC_CACHE_LINE_SHIFT
14#define L1_CACHE_SHIFT 6
15#else
16#define L1_CACHE_SHIFT CONFIG_ARC_CACHE_LINE_SHIFT
17#endif
18
19#define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
20
21#define ARC_ICACHE_WAYS 2
22#define ARC_DCACHE_WAYS 4
23
24/* Helpers */
25#define ARC_ICACHE_LINE_LEN L1_CACHE_BYTES
26#define ARC_DCACHE_LINE_LEN L1_CACHE_BYTES
27
28#define ICACHE_LINE_MASK (~(ARC_ICACHE_LINE_LEN - 1))
29#define DCACHE_LINE_MASK (~(ARC_DCACHE_LINE_LEN - 1))
30
31#if ARC_ICACHE_LINE_LEN != ARC_DCACHE_LINE_LEN
32#error "Need to fix some code as I/D cache lines not same"
33#else
34#define is_not_cache_aligned(p) ((unsigned long)p & (~DCACHE_LINE_MASK))
35#endif
36
37#ifndef __ASSEMBLY__
38
39/* Uncached access macros */
40#define arc_read_uncached_32(ptr) \
41({ \
42 unsigned int __ret; \
43 __asm__ __volatile__( \
44 " ld.di %0, [%1] \n" \
45 : "=r"(__ret) \
46 : "r"(ptr)); \
47 __ret; \
48})
49
50#define arc_write_uncached_32(ptr, data)\
51({ \
52 __asm__ __volatile__( \
53 " st.di %0, [%1] \n" \
54 : \
55 : "r"(data), "r"(ptr)); \
56})
57
58/* used to give SHMLBA a value to avoid Cache Aliasing */
59extern unsigned int ARC_shmlba;
60
61#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
62
63/*
64 * ARC700 doesn't cache any access in top 256M.
65 * Ideal for wiring memory mapped peripherals as we don't need to do
66 * explicit uncached accesses (LD.di/ST.di) hence more portable drivers
67 */
68#define ARC_UNCACHED_ADDR_SPACE 0xc0000000
69
70extern void arc_cache_init(void);
71extern char *arc_cache_mumbojumbo(int cpu_id, char *buf, int len);
72extern void __init read_decode_cache_bcr(void);
73#endif
74
75#endif /* _ASM_CACHE_H */