Linux kernel mirror (for testing)
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1/*
2 * include/asm-xtensa/cacheflush.h
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * (C) 2001 - 2007 Tensilica Inc.
9 */
10
11#ifndef _XTENSA_CACHEFLUSH_H
12#define _XTENSA_CACHEFLUSH_H
13
14#ifdef __KERNEL__
15
16#include <linux/mm.h>
17#include <asm/processor.h>
18#include <asm/page.h>
19
20/*
21 * Lo-level routines for cache flushing.
22 *
23 * invalidate data or instruction cache:
24 *
25 * __invalidate_icache_all()
26 * __invalidate_icache_page(adr)
27 * __invalidate_dcache_page(adr)
28 * __invalidate_icache_range(from,size)
29 * __invalidate_dcache_range(from,size)
30 *
31 * flush data cache:
32 *
33 * __flush_dcache_page(adr)
34 *
35 * flush and invalidate data cache:
36 *
37 * __flush_invalidate_dcache_all()
38 * __flush_invalidate_dcache_page(adr)
39 * __flush_invalidate_dcache_range(from,size)
40 *
41 * specials for cache aliasing:
42 *
43 * __flush_invalidate_dcache_page_alias(vaddr,paddr)
44 * __invalidate_icache_page_alias(vaddr,paddr)
45 */
46
47extern void __invalidate_dcache_all(void);
48extern void __invalidate_icache_all(void);
49extern void __invalidate_dcache_page(unsigned long);
50extern void __invalidate_icache_page(unsigned long);
51extern void __invalidate_icache_range(unsigned long, unsigned long);
52extern void __invalidate_dcache_range(unsigned long, unsigned long);
53
54
55#if XCHAL_DCACHE_IS_WRITEBACK
56extern void __flush_invalidate_dcache_all(void);
57extern void __flush_dcache_page(unsigned long);
58extern void __flush_dcache_range(unsigned long, unsigned long);
59extern void __flush_invalidate_dcache_page(unsigned long);
60extern void __flush_invalidate_dcache_range(unsigned long, unsigned long);
61#else
62# define __flush_dcache_range(p,s) do { } while(0)
63# define __flush_dcache_page(p) do { } while(0)
64# define __flush_invalidate_dcache_page(p) __invalidate_dcache_page(p)
65# define __flush_invalidate_dcache_range(p,s) __invalidate_dcache_range(p,s)
66#endif
67
68#if defined(CONFIG_MMU) && (DCACHE_WAY_SIZE > PAGE_SIZE)
69extern void __flush_invalidate_dcache_page_alias(unsigned long, unsigned long);
70#else
71static inline void __flush_invalidate_dcache_page_alias(unsigned long virt,
72 unsigned long phys) { }
73#endif
74#if defined(CONFIG_MMU) && (ICACHE_WAY_SIZE > PAGE_SIZE)
75extern void __invalidate_icache_page_alias(unsigned long, unsigned long);
76#else
77static inline void __invalidate_icache_page_alias(unsigned long virt,
78 unsigned long phys) { }
79#endif
80
81/*
82 * We have physically tagged caches - nothing to do here -
83 * unless we have cache aliasing.
84 *
85 * Pages can get remapped. Because this might change the 'color' of that page,
86 * we have to flush the cache before the PTE is changed.
87 * (see also Documentation/cachetlb.txt)
88 */
89
90#if (DCACHE_WAY_SIZE > PAGE_SIZE)
91
92#define flush_cache_all() \
93 do { \
94 __flush_invalidate_dcache_all(); \
95 __invalidate_icache_all(); \
96 } while (0)
97
98#define flush_cache_mm(mm) flush_cache_all()
99#define flush_cache_dup_mm(mm) flush_cache_mm(mm)
100
101#define flush_cache_vmap(start,end) flush_cache_all()
102#define flush_cache_vunmap(start,end) flush_cache_all()
103
104#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
105extern void flush_dcache_page(struct page*);
106extern void flush_cache_range(struct vm_area_struct*, ulong, ulong);
107extern void flush_cache_page(struct vm_area_struct*, unsigned long, unsigned long);
108
109#else
110
111#define flush_cache_all() do { } while (0)
112#define flush_cache_mm(mm) do { } while (0)
113#define flush_cache_dup_mm(mm) do { } while (0)
114
115#define flush_cache_vmap(start,end) do { } while (0)
116#define flush_cache_vunmap(start,end) do { } while (0)
117
118#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
119#define flush_dcache_page(page) do { } while (0)
120
121#define flush_cache_page(vma,addr,pfn) do { } while (0)
122#define flush_cache_range(vma,start,end) do { } while (0)
123
124#endif
125
126/* Ensure consistency between data and instruction cache. */
127#define flush_icache_range(start,end) \
128 do { \
129 __flush_dcache_range(start, (end) - (start)); \
130 __invalidate_icache_range(start,(end) - (start)); \
131 } while (0)
132
133/* This is not required, see Documentation/cachetlb.txt */
134#define flush_icache_page(vma,page) do { } while (0)
135
136#define flush_dcache_mmap_lock(mapping) do { } while (0)
137#define flush_dcache_mmap_unlock(mapping) do { } while (0)
138
139#if (DCACHE_WAY_SIZE > PAGE_SIZE)
140
141extern void copy_to_user_page(struct vm_area_struct*, struct page*,
142 unsigned long, void*, const void*, unsigned long);
143extern void copy_from_user_page(struct vm_area_struct*, struct page*,
144 unsigned long, void*, const void*, unsigned long);
145
146#else
147
148#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
149 do { \
150 memcpy(dst, src, len); \
151 __flush_dcache_range((unsigned long) dst, len); \
152 __invalidate_icache_range((unsigned long) dst, len); \
153 } while (0)
154
155#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
156 memcpy(dst, src, len)
157
158#endif
159
160#define XTENSA_CACHEBLK_LOG2 29
161#define XTENSA_CACHEBLK_SIZE (1 << XTENSA_CACHEBLK_LOG2)
162#define XTENSA_CACHEBLK_MASK (7 << XTENSA_CACHEBLK_LOG2)
163
164#if XCHAL_HAVE_CACHEATTR
165static inline u32 xtensa_get_cacheattr(void)
166{
167 u32 r;
168 asm volatile(" rsr %0, CACHEATTR" : "=a"(r));
169 return r;
170}
171
172static inline u32 xtensa_get_dtlb1(u32 addr)
173{
174 u32 r = addr & XTENSA_CACHEBLK_MASK;
175 return r | ((xtensa_get_cacheattr() >> (r >> (XTENSA_CACHEBLK_LOG2-2)))
176 & 0xF);
177}
178#else
179static inline u32 xtensa_get_dtlb1(u32 addr)
180{
181 u32 r;
182 asm volatile(" rdtlb1 %0, %1" : "=a"(r) : "a"(addr));
183 asm volatile(" dsync");
184 return r;
185}
186
187static inline u32 xtensa_get_cacheattr(void)
188{
189 u32 r = 0;
190 u32 a = 0;
191 do {
192 a -= XTENSA_CACHEBLK_SIZE;
193 r = (r << 4) | (xtensa_get_dtlb1(a) & 0xF);
194 } while (a);
195 return r;
196}
197#endif
198
199static inline int xtensa_need_flush_dma_source(u32 addr)
200{
201 return (xtensa_get_dtlb1(addr) & ((1 << XCHAL_CA_BITS) - 1)) >= 4;
202}
203
204static inline int xtensa_need_invalidate_dma_destination(u32 addr)
205{
206 return (xtensa_get_dtlb1(addr) & ((1 << XCHAL_CA_BITS) - 1)) != 2;
207}
208
209static inline void flush_dcache_unaligned(u32 addr, u32 size)
210{
211 u32 cnt;
212 if (size) {
213 cnt = (size + ((XCHAL_DCACHE_LINESIZE - 1) & addr)
214 + XCHAL_DCACHE_LINESIZE - 1) / XCHAL_DCACHE_LINESIZE;
215 while (cnt--) {
216 asm volatile(" dhwb %0, 0" : : "a"(addr));
217 addr += XCHAL_DCACHE_LINESIZE;
218 }
219 asm volatile(" dsync");
220 }
221}
222
223static inline void invalidate_dcache_unaligned(u32 addr, u32 size)
224{
225 int cnt;
226 if (size) {
227 asm volatile(" dhwbi %0, 0 ;" : : "a"(addr));
228 cnt = (size + ((XCHAL_DCACHE_LINESIZE - 1) & addr)
229 - XCHAL_DCACHE_LINESIZE - 1) / XCHAL_DCACHE_LINESIZE;
230 while (cnt-- > 0) {
231 asm volatile(" dhi %0, %1" : : "a"(addr),
232 "n"(XCHAL_DCACHE_LINESIZE));
233 addr += XCHAL_DCACHE_LINESIZE;
234 }
235 asm volatile(" dhwbi %0, %1" : : "a"(addr),
236 "n"(XCHAL_DCACHE_LINESIZE));
237 asm volatile(" dsync");
238 }
239}
240
241static inline void flush_invalidate_dcache_unaligned(u32 addr, u32 size)
242{
243 u32 cnt;
244 if (size) {
245 cnt = (size + ((XCHAL_DCACHE_LINESIZE - 1) & addr)
246 + XCHAL_DCACHE_LINESIZE - 1) / XCHAL_DCACHE_LINESIZE;
247 while (cnt--) {
248 asm volatile(" dhwbi %0, 0" : : "a"(addr));
249 addr += XCHAL_DCACHE_LINESIZE;
250 }
251 asm volatile(" dsync");
252 }
253}
254
255#endif /* __KERNEL__ */
256#endif /* _XTENSA_CACHEFLUSH_H */