2 * linux/arch/arm/mm/cache-v4wb.S
4 * Copyright (C) 1997-2002 Russell king
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 #include <linux/config.h>
11 #include <linux/linkage.h>
12 #include <linux/init.h>
13 #include <asm/memory.h>
15 #include "proc-macros.S"
18 * The size of one data cache line.
20 #define CACHE_DLINESIZE 32
23 * The total size of the data cache.
25 #if defined(CONFIG_CPU_SA110)
26 # define CACHE_DSIZE 16384
27 #elif defined(CONFIG_CPU_SA1100)
28 # define CACHE_DSIZE 8192
30 # error Unknown cache size
34 * This is the size at which it becomes more efficient to
35 * clean the whole cache, rather than using the individual
36 * cache line maintainence instructions.
38 * Size Clean (ticks) Dirty (ticks)
39 * 4096 21 20 21 53 55 54
40 * 8192 40 41 40 106 100 102
41 * 16384 77 77 76 140 140 138
42 * 32768 150 149 150 214 216 212 <---
43 * 65536 296 297 296 351 358 361
44 * 131072 591 591 591 656 657 651
45 * Whole 132 136 132 221 217 207 <---
47 #define CACHE_DLIMIT (CACHE_DSIZE * 4)
55 * flush_user_cache_all()
57 * Clean and invalidate all cache entries in a particular address
60 ENTRY(v4wb_flush_user_cache_all)
63 * flush_kern_cache_all()
65 * Clean and invalidate the entire cache.
67 ENTRY(v4wb_flush_kern_cache_all)
69 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
73 eor r1, r1, #CACHE_DSIZE
75 add r2, r1, #CACHE_DSIZE
79 #ifdef FLUSH_BASE_MINICACHE
80 add r2, r2, #FLUSH_BASE_MINICACHE - FLUSH_BASE
81 sub r1, r2, #512 @ only 512 bytes
86 mcr p15, 0, ip, c7, c10, 4 @ drain write buffer
90 * flush_user_cache_range(start, end, flags)
92 * Invalidate a range of cache entries in the specified
95 * - start - start address (inclusive, page aligned)
96 * - end - end address (exclusive, page aligned)
97 * - flags - vma_area_struct flags describing address space
99 ENTRY(v4wb_flush_user_cache_range)
101 sub r3, r1, r0 @ calculate total size
102 tst r2, #VM_EXEC @ executable region?
103 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
105 cmp r3, #CACHE_DLIMIT @ total size >= limit?
106 bhs __flush_whole_cache @ flush whole D cache
108 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
109 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
110 add r0, r0, #CACHE_DLINESIZE
114 mcrne p15, 0, ip, c7, c10, 4 @ drain write buffer
118 * flush_kern_dcache_page(void *page)
120 * Ensure no D cache aliasing occurs, either with itself or
123 * - addr - page aligned address
125 ENTRY(v4wb_flush_kern_dcache_page)
130 * coherent_kern_range(start, end)
132 * Ensure coherency between the Icache and the Dcache in the
133 * region described by start. If you have non-snooping
134 * Harvard caches, you need to implement this function.
136 * - start - virtual start address
137 * - end - virtual end address
139 ENTRY(v4wb_coherent_kern_range)
143 * coherent_user_range(start, end)
145 * Ensure coherency between the Icache and the Dcache in the
146 * region described by start. If you have non-snooping
147 * Harvard caches, you need to implement this function.
149 * - start - virtual start address
150 * - end - virtual end address
152 ENTRY(v4wb_coherent_user_range)
153 bic r0, r0, #CACHE_DLINESIZE - 1
154 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
155 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
156 add r0, r0, #CACHE_DLINESIZE
160 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
161 mcr p15, 0, ip, c7, c10, 4 @ drain WB
166 * dma_inv_range(start, end)
168 * Invalidate (discard) the specified virtual address range.
169 * May not write back any entries. If 'start' or 'end'
170 * are not cache line aligned, those lines must be written
173 * - start - virtual start address
174 * - end - virtual end address
176 ENTRY(v4wb_dma_inv_range)
177 tst r0, #CACHE_DLINESIZE - 1
178 bic r0, r0, #CACHE_DLINESIZE - 1
179 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
180 tst r1, #CACHE_DLINESIZE - 1
181 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
182 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
183 add r0, r0, #CACHE_DLINESIZE
186 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
190 * dma_clean_range(start, end)
192 * Clean (write back) the specified virtual address range.
194 * - start - virtual start address
195 * - end - virtual end address
197 ENTRY(v4wb_dma_clean_range)
198 bic r0, r0, #CACHE_DLINESIZE - 1
199 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
200 add r0, r0, #CACHE_DLINESIZE
203 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
207 * dma_flush_range(start, end)
209 * Clean and invalidate the specified virtual address range.
211 * - start - virtual start address
212 * - end - virtual end address
214 * This is actually the same as v4wb_coherent_kern_range()
216 .globl v4wb_dma_flush_range
217 .set v4wb_dma_flush_range, v4wb_coherent_kern_range
221 .type v4wb_cache_fns, #object
222 ENTRY(v4wb_cache_fns)
223 .long v4wb_flush_kern_cache_all
224 .long v4wb_flush_user_cache_all
225 .long v4wb_flush_user_cache_range
226 .long v4wb_coherent_kern_range
227 .long v4wb_coherent_user_range
228 .long v4wb_flush_kern_dcache_page
229 .long v4wb_dma_inv_range
230 .long v4wb_dma_clean_range
231 .long v4wb_dma_flush_range
232 .size v4wb_cache_fns, . - v4wb_cache_fns