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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 
26 struct l2x0_regs;
27 
28 struct outer_cache_fns {
29 	void (*inv_range)(unsigned long, unsigned long);
30 	void (*clean_range)(unsigned long, unsigned long);
31 	void (*flush_range)(unsigned long, unsigned long);
32 	void (*flush_all)(void);
33 	void (*disable)(void);
34 #ifdef CONFIG_OUTER_CACHE_SYNC
35 	void (*sync)(void);
36 #endif
37 	void (*resume)(void);
38 
39 	/* This is an ARM L2C thing */
40 	void (*write_sec)(unsigned long, unsigned);
41 	void (*configure)(const struct l2x0_regs *);
42 };
43 
44 extern struct outer_cache_fns outer_cache;
45 
46 #ifdef CONFIG_OUTER_CACHE
47 /**
48  * outer_inv_range - invalidate range of outer cache lines
49  * @start: starting physical address, inclusive
50  * @end: end physical address, exclusive
51  */
outer_inv_range(phys_addr_t start,phys_addr_t end)52 static inline void outer_inv_range(phys_addr_t start, phys_addr_t end)
53 {
54 	if (outer_cache.inv_range)
55 		outer_cache.inv_range(start, end);
56 }
57 
58 /**
59  * outer_clean_range - clean dirty outer cache lines
60  * @start: starting physical address, inclusive
61  * @end: end physical address, exclusive
62  */
outer_clean_range(phys_addr_t start,phys_addr_t end)63 static inline void outer_clean_range(phys_addr_t start, phys_addr_t end)
64 {
65 	if (outer_cache.clean_range)
66 		outer_cache.clean_range(start, end);
67 }
68 
69 /**
70  * outer_flush_range - clean and invalidate outer cache lines
71  * @start: starting physical address, inclusive
72  * @end: end physical address, exclusive
73  */
outer_flush_range(phys_addr_t start,phys_addr_t end)74 static inline void outer_flush_range(phys_addr_t start, phys_addr_t end)
75 {
76 	if (outer_cache.flush_range)
77 		outer_cache.flush_range(start, end);
78 }
79 
80 /**
81  * outer_flush_all - clean and invalidate all cache lines in the outer cache
82  *
83  * Note: depending on implementation, this may not be atomic - it must
84  * only be called with interrupts disabled and no other active outer
85  * cache masters.
86  *
87  * It is intended that this function is only used by implementations
88  * needing to override the outer_cache.disable() method due to security.
89  * (Some implementations perform this as a clean followed by an invalidate.)
90  */
outer_flush_all(void)91 static inline void outer_flush_all(void)
92 {
93 	if (outer_cache.flush_all)
94 		outer_cache.flush_all();
95 }
96 
97 /**
98  * outer_disable - clean, invalidate and disable the outer cache
99  *
100  * Disable the outer cache, ensuring that any data contained in the outer
101  * cache is pushed out to lower levels of system memory.  The note and
102  * conditions above concerning outer_flush_all() applies here.
103  */
104 extern void outer_disable(void);
105 
106 /**
107  * outer_resume - restore the cache configuration and re-enable outer cache
108  *
109  * Restore any configuration that the cache had when previously enabled,
110  * and re-enable the outer cache.
111  */
outer_resume(void)112 static inline void outer_resume(void)
113 {
114 	if (outer_cache.resume)
115 		outer_cache.resume();
116 }
117 
118 #else
119 
outer_inv_range(phys_addr_t start,phys_addr_t end)120 static inline void outer_inv_range(phys_addr_t start, phys_addr_t end)
121 { }
outer_clean_range(phys_addr_t start,phys_addr_t end)122 static inline void outer_clean_range(phys_addr_t start, phys_addr_t end)
123 { }
outer_flush_range(phys_addr_t start,phys_addr_t end)124 static inline void outer_flush_range(phys_addr_t start, phys_addr_t end)
125 { }
outer_flush_all(void)126 static inline void outer_flush_all(void) { }
outer_disable(void)127 static inline void outer_disable(void) { }
outer_resume(void)128 static inline void outer_resume(void) { }
129 
130 #endif
131 
132 #endif	/* __ASM_OUTERCACHE_H */
133