1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * (C) 2001 - 2013 Tensilica Inc.
7  */
8 
9 #ifndef _XTENSA_CACHEFLUSH_H
10 #define _XTENSA_CACHEFLUSH_H
11 
12 #include <linux/mm.h>
13 #include <asm/processor.h>
14 #include <asm/page.h>
15 
16 /*
17  * Lo-level routines for cache flushing.
18  *
19  * invalidate data or instruction cache:
20  *
21  * __invalidate_icache_all()
22  * __invalidate_icache_page(adr)
23  * __invalidate_dcache_page(adr)
24  * __invalidate_icache_range(from,size)
25  * __invalidate_dcache_range(from,size)
26  *
27  * flush data cache:
28  *
29  * __flush_dcache_page(adr)
30  *
31  * flush and invalidate data cache:
32  *
33  * __flush_invalidate_dcache_all()
34  * __flush_invalidate_dcache_page(adr)
35  * __flush_invalidate_dcache_range(from,size)
36  *
37  * specials for cache aliasing:
38  *
39  * __flush_invalidate_dcache_page_alias(vaddr,paddr)
40  * __invalidate_dcache_page_alias(vaddr,paddr)
41  * __invalidate_icache_page_alias(vaddr,paddr)
42  */
43 
44 extern void __invalidate_dcache_all(void);
45 extern void __invalidate_icache_all(void);
46 extern void __invalidate_dcache_page(unsigned long);
47 extern void __invalidate_icache_page(unsigned long);
48 extern void __invalidate_icache_range(unsigned long, unsigned long);
49 extern void __invalidate_dcache_range(unsigned long, unsigned long);
50 
51 #if XCHAL_DCACHE_IS_WRITEBACK
52 extern void __flush_invalidate_dcache_all(void);
53 extern void __flush_dcache_page(unsigned long);
54 extern void __flush_dcache_range(unsigned long, unsigned long);
55 extern void __flush_invalidate_dcache_page(unsigned long);
56 extern void __flush_invalidate_dcache_range(unsigned long, unsigned long);
57 #else
58 static inline void __flush_dcache_page(unsigned long va)
59 {
60 }
61 static inline void __flush_dcache_range(unsigned long va, unsigned long sz)
62 {
63 }
64 # define __flush_invalidate_dcache_all()	__invalidate_dcache_all()
65 # define __flush_invalidate_dcache_page(p)	__invalidate_dcache_page(p)
66 # define __flush_invalidate_dcache_range(p,s)	__invalidate_dcache_range(p,s)
67 #endif
68 
69 #if defined(CONFIG_MMU) && (DCACHE_WAY_SIZE > PAGE_SIZE)
70 extern void __flush_invalidate_dcache_page_alias(unsigned long, unsigned long);
71 extern void __invalidate_dcache_page_alias(unsigned long, unsigned long);
72 #else
73 static inline void __flush_invalidate_dcache_page_alias(unsigned long virt,
74 							unsigned long phys) { }
75 static inline void __invalidate_dcache_page_alias(unsigned long virt,
76 						  unsigned long phys) { }
77 #endif
78 #if defined(CONFIG_MMU) && (ICACHE_WAY_SIZE > PAGE_SIZE)
79 extern void __invalidate_icache_page_alias(unsigned long, unsigned long);
80 #else
81 static inline void __invalidate_icache_page_alias(unsigned long virt,
82 						unsigned long phys) { }
83 #endif
84 
85 /*
86  * We have physically tagged caches - nothing to do here -
87  * unless we have cache aliasing.
88  *
89  * Pages can get remapped. Because this might change the 'color' of that page,
90  * we have to flush the cache before the PTE is changed.
91  * (see also Documentation/core-api/cachetlb.rst)
92  */
93 
94 #if defined(CONFIG_MMU) && \
95 	((DCACHE_WAY_SIZE > PAGE_SIZE) || defined(CONFIG_SMP))
96 
97 #ifdef CONFIG_SMP
98 void flush_cache_all(void);
99 void flush_cache_range(struct vm_area_struct*, ulong, ulong);
100 void flush_icache_range(unsigned long start, unsigned long end);
101 void flush_cache_page(struct vm_area_struct*,
102 			     unsigned long, unsigned long);
103 #else
104 #define flush_cache_all local_flush_cache_all
105 #define flush_cache_range local_flush_cache_range
106 #define flush_icache_range local_flush_icache_range
107 #define flush_cache_page  local_flush_cache_page
108 #endif
109 
110 #define local_flush_cache_all()						\
111 	do {								\
112 		__flush_invalidate_dcache_all();			\
113 		__invalidate_icache_all();				\
114 	} while (0)
115 
116 #define flush_cache_mm(mm)		flush_cache_all()
117 #define flush_cache_dup_mm(mm)		flush_cache_mm(mm)
118 
119 #define flush_cache_vmap(start,end)	flush_cache_all()
120 #define flush_cache_vunmap(start,end)	flush_cache_all()
121 
122 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
123 extern void flush_dcache_page(struct page*);
124 
125 void local_flush_cache_range(struct vm_area_struct *vma,
126 		unsigned long start, unsigned long end);
127 void local_flush_cache_page(struct vm_area_struct *vma,
128 		unsigned long address, unsigned long pfn);
129 
130 #else
131 
132 #define flush_cache_all()				do { } while (0)
133 #define flush_cache_mm(mm)				do { } while (0)
134 #define flush_cache_dup_mm(mm)				do { } while (0)
135 
136 #define flush_cache_vmap(start,end)			do { } while (0)
137 #define flush_cache_vunmap(start,end)			do { } while (0)
138 
139 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
140 #define flush_dcache_page(page)				do { } while (0)
141 
142 #define flush_icache_range local_flush_icache_range
143 #define flush_cache_page(vma, addr, pfn)		do { } while (0)
144 #define flush_cache_range(vma, start, end)		do { } while (0)
145 
146 #endif
147 
148 #define flush_icache_user_range flush_icache_range
149 
150 /* Ensure consistency between data and instruction cache. */
151 #define local_flush_icache_range(start, end)				\
152 	do {								\
153 		__flush_dcache_range(start, (end) - (start));		\
154 		__invalidate_icache_range(start,(end) - (start));	\
155 	} while (0)
156 
157 /* This is not required, see Documentation/core-api/cachetlb.rst */
158 #define	flush_icache_page(vma,page)			do { } while (0)
159 
160 #define flush_dcache_mmap_lock(mapping)			do { } while (0)
161 #define flush_dcache_mmap_unlock(mapping)		do { } while (0)
162 
163 #if defined(CONFIG_MMU) && (DCACHE_WAY_SIZE > PAGE_SIZE)
164 
165 extern void copy_to_user_page(struct vm_area_struct*, struct page*,
166 		unsigned long, void*, const void*, unsigned long);
167 extern void copy_from_user_page(struct vm_area_struct*, struct page*,
168 		unsigned long, void*, const void*, unsigned long);
169 
170 #else
171 
172 #define copy_to_user_page(vma, page, vaddr, dst, src, len)		\
173 	do {								\
174 		memcpy(dst, src, len);					\
175 		__flush_dcache_range((unsigned long) dst, len);		\
176 		__invalidate_icache_range((unsigned long) dst, len);	\
177 	} while (0)
178 
179 #define copy_from_user_page(vma, page, vaddr, dst, src, len) \
180 	memcpy(dst, src, len)
181 
182 #endif
183 
184 #endif /* _XTENSA_CACHEFLUSH_H */
185