Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
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#define CACHE_LINE_MASK (~(L1_CACHE_BYTES - 1))
21
22/*
23 * ARC700 doesn't cache any access in top 1G (0xc000_0000 to 0xFFFF_FFFF)
24 * Ideal for wiring memory mapped peripherals as we don't need to do
25 * explicit uncached accesses (LD.di/ST.di) hence more portable drivers
26 */
27#define ARC_UNCACHED_ADDR_SPACE 0xc0000000
28
29#ifndef __ASSEMBLY__
30
31/* Uncached access macros */
32#define arc_read_uncached_32(ptr) \
33({ \
34 unsigned int __ret; \
35 __asm__ __volatile__( \
36 " ld.di %0, [%1] \n" \
37 : "=r"(__ret) \
38 : "r"(ptr)); \
39 __ret; \
40})
41
42#define arc_write_uncached_32(ptr, data)\
43({ \
44 __asm__ __volatile__( \
45 " st.di %0, [%1] \n" \
46 : \
47 : "r"(data), "r"(ptr)); \
48})
49
50#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
51
52extern void arc_cache_init(void);
53extern char *arc_cache_mumbojumbo(int cpu_id, char *buf, int len);
54extern void read_decode_cache_bcr(void);
55
56extern int ioc_exists;
57
58#endif /* !__ASSEMBLY__ */
59
60/* Instruction cache related Auxiliary registers */
61#define ARC_REG_IC_BCR 0x77 /* Build Config reg */
62#define ARC_REG_IC_IVIC 0x10
63#define ARC_REG_IC_CTRL 0x11
64#define ARC_REG_IC_IVIL 0x19
65#if defined(CONFIG_ARC_MMU_V3) || defined(CONFIG_ARC_MMU_V4)
66#define ARC_REG_IC_PTAG 0x1E
67#endif
68#define ARC_REG_IC_PTAG_HI 0x1F
69
70/* Bit val in IC_CTRL */
71#define IC_CTRL_CACHE_DISABLE 0x1
72
73/* Data cache related Auxiliary registers */
74#define ARC_REG_DC_BCR 0x72 /* Build Config reg */
75#define ARC_REG_DC_IVDC 0x47
76#define ARC_REG_DC_CTRL 0x48
77#define ARC_REG_DC_IVDL 0x4A
78#define ARC_REG_DC_FLSH 0x4B
79#define ARC_REG_DC_FLDL 0x4C
80#define ARC_REG_DC_PTAG 0x5C
81#define ARC_REG_DC_PTAG_HI 0x5F
82
83/* Bit val in DC_CTRL */
84#define DC_CTRL_INV_MODE_FLUSH 0x40
85#define DC_CTRL_FLUSH_STATUS 0x100
86
87/*System-level cache (L2 cache) related Auxiliary registers */
88#define ARC_REG_SLC_CFG 0x901
89#define ARC_REG_SLC_CTRL 0x903
90#define ARC_REG_SLC_FLUSH 0x904
91#define ARC_REG_SLC_INVALIDATE 0x905
92#define ARC_REG_SLC_RGN_START 0x914
93#define ARC_REG_SLC_RGN_END 0x916
94
95/* Bit val in SLC_CONTROL */
96#define SLC_CTRL_IM 0x040
97#define SLC_CTRL_DISABLE 0x001
98#define SLC_CTRL_BUSY 0x100
99#define SLC_CTRL_RGN_OP_INV 0x200
100
101/* IO coherency related Auxiliary registers */
102#define ARC_REG_IO_COH_ENABLE 0x500
103#define ARC_REG_IO_COH_PARTIAL 0x501
104#define ARC_REG_IO_COH_AP0_BASE 0x508
105#define ARC_REG_IO_COH_AP0_SIZE 0x509
106
107#endif /* _ASM_CACHE_H */