1/*
2 * Copyright (C) 2004-2006 Atmel Corporation
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#ifndef __ASM_AVR32_CACHEFLUSH_H
9#define __ASM_AVR32_CACHEFLUSH_H
10
11/* Keep includes the same across arches.  */
12#include <linux/mm.h>
13
14#define CACHE_OP_ICACHE_INVALIDATE	0x01
15#define CACHE_OP_DCACHE_INVALIDATE	0x0b
16#define CACHE_OP_DCACHE_CLEAN		0x0c
17#define CACHE_OP_DCACHE_CLEAN_INVAL	0x0d
18
19/*
20 * Invalidate any cacheline containing virtual address vaddr without
21 * writing anything back to memory.
22 *
23 * Note that this function may corrupt unrelated data structures when
24 * applied on buffers that are not cacheline aligned in both ends.
25 */
26static inline void invalidate_dcache_line(void *vaddr)
27{
28	asm volatile("cache %0[0], %1"
29		     :
30		     : "r"(vaddr), "n"(CACHE_OP_DCACHE_INVALIDATE)
31		     : "memory");
32}
33
34/*
35 * Make sure any cacheline containing virtual address vaddr is written
36 * to memory.
37 */
38static inline void clean_dcache_line(void *vaddr)
39{
40	asm volatile("cache %0[0], %1"
41		     :
42		     : "r"(vaddr), "n"(CACHE_OP_DCACHE_CLEAN)
43		     : "memory");
44}
45
46/*
47 * Make sure any cacheline containing virtual address vaddr is written
48 * to memory and then invalidate it.
49 */
50static inline void flush_dcache_line(void *vaddr)
51{
52	asm volatile("cache %0[0], %1"
53		     :
54		     : "r"(vaddr), "n"(CACHE_OP_DCACHE_CLEAN_INVAL)
55		     : "memory");
56}
57
58/*
59 * Invalidate any instruction cacheline containing virtual address
60 * vaddr.
61 */
62static inline void invalidate_icache_line(void *vaddr)
63{
64	asm volatile("cache %0[0], %1"
65		     :
66		     : "r"(vaddr), "n"(CACHE_OP_ICACHE_INVALIDATE)
67		     : "memory");
68}
69
70/*
71 * Applies the above functions on all lines that are touched by the
72 * specified virtual address range.
73 */
74void invalidate_dcache_region(void *start, size_t len);
75void clean_dcache_region(void *start, size_t len);
76void flush_dcache_region(void *start, size_t len);
77void invalidate_icache_region(void *start, size_t len);
78
79/*
80 * Make sure any pending writes are completed before continuing.
81 */
82#define flush_write_buffer() asm volatile("sync 0" : : : "memory")
83
84/*
85 * The following functions are called when a virtual mapping changes.
86 * We do not need to flush anything in this case.
87 */
88#define flush_cache_all()			do { } while (0)
89#define flush_cache_mm(mm)			do { } while (0)
90#define flush_cache_dup_mm(mm)			do { } while (0)
91#define flush_cache_range(vma, start, end)	do { } while (0)
92#define flush_cache_page(vma, vmaddr, pfn)	do { } while (0)
93#define flush_cache_vmap(start, end)		do { } while (0)
94#define flush_cache_vunmap(start, end)		do { } while (0)
95
96/*
97 * I think we need to implement this one to be able to reliably
98 * execute pages from RAMDISK. However, if we implement the
99 * flush_dcache_*() functions, it might not be needed anymore.
100 *
101 * #define flush_icache_page(vma, page)		do { } while (0)
102 */
103extern void flush_icache_page(struct vm_area_struct *vma, struct page *page);
104
105/*
106 * These are (I think) related to D-cache aliasing.  We might need to
107 * do something here, but only for certain configurations.  No such
108 * configurations exist at this time.
109 */
110#define flush_dcache_page(page)			do { } while (0)
111#define flush_dcache_mmap_lock(page)		do { } while (0)
112#define flush_dcache_mmap_unlock(page)		do { } while (0)
113
114/*
115 * These are for I/D cache coherency. In this case, we do need to
116 * flush with all configurations.
117 */
118extern void flush_icache_range(unsigned long start, unsigned long end);
119extern void flush_icache_user_range(struct vm_area_struct *vma,
120				    struct page *page,
121				    unsigned long addr, int len);
122
123#define copy_to_user_page(vma, page, vaddr, dst, src, len) do {	\
124	memcpy(dst, src, len);					\
125	flush_icache_user_range(vma, page, vaddr, len);		\
126} while(0)
127#define copy_from_user_page(vma, page, vaddr, dst, src, len)	\
128	memcpy(dst, src, len)
129
130#endif /* __ASM_AVR32_CACHEFLUSH_H */
131