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 47 extern void __invalidate_dcache_all(void); 48 extern void __invalidate_icache_all(void); 49 extern void __invalidate_dcache_page(unsigned long); 50 extern void __invalidate_icache_page(unsigned long); 51 extern void __invalidate_icache_range(unsigned long, unsigned long); 52 extern void __invalidate_dcache_range(unsigned long, unsigned long); 53 54 55 #if XCHAL_DCACHE_IS_WRITEBACK 56 extern void __flush_invalidate_dcache_all(void); 57 extern void __flush_dcache_page(unsigned long); 58 extern void __flush_dcache_range(unsigned long, unsigned long); 59 extern void __flush_invalidate_dcache_page(unsigned long); 60 extern 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) 69 extern void __flush_invalidate_dcache_page_alias(unsigned long, unsigned long); 70 #else 71 static 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) 75 extern void __invalidate_icache_page_alias(unsigned long, unsigned long); 76 #else 77 static 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 1 105 extern void flush_dcache_page(struct page*); 106 extern void flush_cache_range(struct vm_area_struct*, ulong, ulong); 107 extern 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) 140 141 extern void copy_to_user_page(struct vm_area_struct*, struct page*, 142 unsigned long, void*, const void*, unsigned long); 143 extern 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 165 static inline u32 xtensa_get_cacheattr(void) 166 { 167 u32 r; 168 asm volatile(" rsr %0, cacheattr" : "=a"(r)); 169 return r; 170 } 171 172 static 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 179 static 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 } 186 187 static 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 198 199 static inline int xtensa_need_flush_dma_source(u32 addr) 200 { 201 return (xtensa_get_dtlb1(addr) & ((1 << XCHAL_CA_BITS) - 1)) >= 4; 202 } 203 204 static inline int xtensa_need_invalidate_dma_destination(u32 addr) 205 { 206 return (xtensa_get_dtlb1(addr) & ((1 << XCHAL_CA_BITS) - 1)) != 2; 207 } 208 209 static 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 } 222 223 static 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 } 240 241 static 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 */ 257