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1/*
2 * arch/arm/include/asm/outercache.h
3 *
4 * Copyright (C) 2010 ARM Ltd.
5 * Written by Catalin Marinas <catalin.marinas@arm.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 version 2 as
9 * published by the Free Software Foundation.
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
21#ifndef __ASM_OUTERCACHE_H
22#define __ASM_OUTERCACHE_H
23
24#include <linux/types.h>
25
26struct outer_cache_fns {
27 void (*inv_range)(unsigned long, unsigned long);
28 void (*clean_range)(unsigned long, unsigned long);
29 void (*flush_range)(unsigned long, unsigned long);
30 void (*flush_all)(void);
31 void (*disable)(void);
32#ifdef CONFIG_OUTER_CACHE_SYNC
33 void (*sync)(void);
34#endif
35 void (*resume)(void);
36
37 /* This is an ARM L2C thing */
38 void (*write_sec)(unsigned long, unsigned);
39};
40
41extern struct outer_cache_fns outer_cache;
42
43#ifdef CONFIG_OUTER_CACHE
44/**
45 * outer_inv_range - invalidate range of outer cache lines
46 * @start: starting physical address, inclusive
47 * @end: end physical address, exclusive
48 */
49static inline void outer_inv_range(phys_addr_t start, phys_addr_t end)
50{
51 if (outer_cache.inv_range)
52 outer_cache.inv_range(start, end);
53}
54
55/**
56 * outer_clean_range - clean dirty outer cache lines
57 * @start: starting physical address, inclusive
58 * @end: end physical address, exclusive
59 */
60static inline void outer_clean_range(phys_addr_t start, phys_addr_t end)
61{
62 if (outer_cache.clean_range)
63 outer_cache.clean_range(start, end);
64}
65
66/**
67 * outer_flush_range - clean and invalidate outer cache lines
68 * @start: starting physical address, inclusive
69 * @end: end physical address, exclusive
70 */
71static inline void outer_flush_range(phys_addr_t start, phys_addr_t end)
72{
73 if (outer_cache.flush_range)
74 outer_cache.flush_range(start, end);
75}
76
77/**
78 * outer_flush_all - clean and invalidate all cache lines in the outer cache
79 *
80 * Note: depending on implementation, this may not be atomic - it must
81 * only be called with interrupts disabled and no other active outer
82 * cache masters.
83 *
84 * It is intended that this function is only used by implementations
85 * needing to override the outer_cache.disable() method due to security.
86 * (Some implementations perform this as a clean followed by an invalidate.)
87 */
88static inline void outer_flush_all(void)
89{
90 if (outer_cache.flush_all)
91 outer_cache.flush_all();
92}
93
94/**
95 * outer_disable - clean, invalidate and disable the outer cache
96 *
97 * Disable the outer cache, ensuring that any data contained in the outer
98 * cache is pushed out to lower levels of system memory. The note and
99 * conditions above concerning outer_flush_all() applies here.
100 */
101extern void outer_disable(void);
102
103/**
104 * outer_resume - restore the cache configuration and re-enable outer cache
105 *
106 * Restore any configuration that the cache had when previously enabled,
107 * and re-enable the outer cache.
108 */
109static inline void outer_resume(void)
110{
111 if (outer_cache.resume)
112 outer_cache.resume();
113}
114
115#else
116
117static inline void outer_inv_range(phys_addr_t start, phys_addr_t end)
118{ }
119static inline void outer_clean_range(phys_addr_t start, phys_addr_t end)
120{ }
121static inline void outer_flush_range(phys_addr_t start, phys_addr_t end)
122{ }
123static inline void outer_flush_all(void) { }
124static inline void outer_disable(void) { }
125static inline void outer_resume(void) { }
126
127#endif
128
129#ifdef CONFIG_OUTER_CACHE_SYNC
130/**
131 * outer_sync - perform a sync point for outer cache
132 *
133 * Ensure that all outer cache operations are complete and any store
134 * buffers are drained.
135 */
136static inline void outer_sync(void)
137{
138 if (outer_cache.sync)
139 outer_cache.sync();
140}
141#else
142static inline void outer_sync(void)
143{ }
144#endif
145
146#endif /* __ASM_OUTERCACHE_H */