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 # define __flush_dcache_range(p,s) do { } while(0) 59 # define __flush_dcache_page(p) do { } while(0) 60 # define __flush_invalidate_dcache_page(p) __invalidate_dcache_page(p) 61 # define __flush_invalidate_dcache_range(p,s) __invalidate_dcache_range(p,s) 62 #endif 63 64 #if defined(CONFIG_MMU) && (DCACHE_WAY_SIZE > PAGE_SIZE) 65 extern void __flush_invalidate_dcache_page_alias(unsigned long, unsigned long); 66 extern void __invalidate_dcache_page_alias(unsigned long, unsigned long); 67 #else 68 static inline void __flush_invalidate_dcache_page_alias(unsigned long virt, 69 unsigned long phys) { } 70 static inline void __invalidate_dcache_page_alias(unsigned long virt, 71 unsigned long phys) { } 72 #endif 73 #if defined(CONFIG_MMU) && (ICACHE_WAY_SIZE > PAGE_SIZE) 74 extern void __invalidate_icache_page_alias(unsigned long, unsigned long); 75 #else 76 static inline void __invalidate_icache_page_alias(unsigned long virt, 77 unsigned long phys) { } 78 #endif 79 80 /* 81 * We have physically tagged caches - nothing to do here - 82 * unless we have cache aliasing. 83 * 84 * Pages can get remapped. Because this might change the 'color' of that page, 85 * we have to flush the cache before the PTE is changed. 86 * (see also Documentation/cachetlb.txt) 87 */ 88 89 #if defined(CONFIG_MMU) && \ 90 ((DCACHE_WAY_SIZE > PAGE_SIZE) || defined(CONFIG_SMP)) 91 92 #ifdef CONFIG_SMP 93 void flush_cache_all(void); 94 void flush_cache_range(struct vm_area_struct*, ulong, ulong); 95 void flush_icache_range(unsigned long start, unsigned long end); 96 void flush_cache_page(struct vm_area_struct*, 97 unsigned long, unsigned long); 98 #else 99 #define flush_cache_all local_flush_cache_all 100 #define flush_cache_range local_flush_cache_range 101 #define flush_icache_range local_flush_icache_range 102 #define flush_cache_page local_flush_cache_page 103 #endif 104 105 #define local_flush_cache_all() \ 106 do { \ 107 __flush_invalidate_dcache_all(); \ 108 __invalidate_icache_all(); \ 109 } while (0) 110 111 #define flush_cache_mm(mm) flush_cache_all() 112 #define flush_cache_dup_mm(mm) flush_cache_mm(mm) 113 114 #define flush_cache_vmap(start,end) flush_cache_all() 115 #define flush_cache_vunmap(start,end) flush_cache_all() 116 117 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1 118 extern void flush_dcache_page(struct page*); 119 120 void local_flush_cache_range(struct vm_area_struct *vma, 121 unsigned long start, unsigned long end); 122 void local_flush_cache_page(struct vm_area_struct *vma, 123 unsigned long address, unsigned long pfn); 124 125 #else 126 127 #define flush_cache_all() do { } while (0) 128 #define flush_cache_mm(mm) do { } while (0) 129 #define flush_cache_dup_mm(mm) do { } while (0) 130 131 #define flush_cache_vmap(start,end) do { } while (0) 132 #define flush_cache_vunmap(start,end) do { } while (0) 133 134 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0 135 #define flush_dcache_page(page) do { } while (0) 136 137 #define flush_icache_range local_flush_icache_range 138 #define flush_cache_page(vma, addr, pfn) do { } while (0) 139 #define flush_cache_range(vma, start, end) do { } while (0) 140 141 #endif 142 143 /* Ensure consistency between data and instruction cache. */ 144 #define local_flush_icache_range(start, end) \ 145 do { \ 146 __flush_dcache_range(start, (end) - (start)); \ 147 __invalidate_icache_range(start,(end) - (start)); \ 148 } while (0) 149 150 /* This is not required, see Documentation/cachetlb.txt */ 151 #define flush_icache_page(vma,page) do { } while (0) 152 153 #define flush_dcache_mmap_lock(mapping) do { } while (0) 154 #define flush_dcache_mmap_unlock(mapping) do { } while (0) 155 156 #if defined(CONFIG_MMU) && (DCACHE_WAY_SIZE > PAGE_SIZE) 157 158 extern void copy_to_user_page(struct vm_area_struct*, struct page*, 159 unsigned long, void*, const void*, unsigned long); 160 extern void copy_from_user_page(struct vm_area_struct*, struct page*, 161 unsigned long, void*, const void*, unsigned long); 162 163 #else 164 165 #define copy_to_user_page(vma, page, vaddr, dst, src, len) \ 166 do { \ 167 memcpy(dst, src, len); \ 168 __flush_dcache_range((unsigned long) dst, len); \ 169 __invalidate_icache_range((unsigned long) dst, len); \ 170 } while (0) 171 172 #define copy_from_user_page(vma, page, vaddr, dst, src, len) \ 173 memcpy(dst, src, len) 174 175 #endif 176 177 #define XTENSA_CACHEBLK_LOG2 29 178 #define XTENSA_CACHEBLK_SIZE (1 << XTENSA_CACHEBLK_LOG2) 179 #define XTENSA_CACHEBLK_MASK (7 << XTENSA_CACHEBLK_LOG2) 180 181 #if XCHAL_HAVE_CACHEATTR 182 static inline u32 xtensa_get_cacheattr(void) 183 { 184 u32 r; 185 asm volatile(" rsr %0, cacheattr" : "=a"(r)); 186 return r; 187 } 188 189 static inline u32 xtensa_get_dtlb1(u32 addr) 190 { 191 u32 r = addr & XTENSA_CACHEBLK_MASK; 192 return r | ((xtensa_get_cacheattr() >> (r >> (XTENSA_CACHEBLK_LOG2-2))) 193 & 0xF); 194 } 195 #else 196 static inline u32 xtensa_get_dtlb1(u32 addr) 197 { 198 u32 r; 199 asm volatile(" rdtlb1 %0, %1" : "=a"(r) : "a"(addr)); 200 asm volatile(" dsync"); 201 return r; 202 } 203 204 static inline u32 xtensa_get_cacheattr(void) 205 { 206 u32 r = 0; 207 u32 a = 0; 208 do { 209 a -= XTENSA_CACHEBLK_SIZE; 210 r = (r << 4) | (xtensa_get_dtlb1(a) & 0xF); 211 } while (a); 212 return r; 213 } 214 #endif 215 216 static inline int xtensa_need_flush_dma_source(u32 addr) 217 { 218 return (xtensa_get_dtlb1(addr) & ((1 << XCHAL_CA_BITS) - 1)) >= 4; 219 } 220 221 static inline int xtensa_need_invalidate_dma_destination(u32 addr) 222 { 223 return (xtensa_get_dtlb1(addr) & ((1 << XCHAL_CA_BITS) - 1)) != 2; 224 } 225 226 static inline void flush_dcache_unaligned(u32 addr, u32 size) 227 { 228 u32 cnt; 229 if (size) { 230 cnt = (size + ((XCHAL_DCACHE_LINESIZE - 1) & addr) 231 + XCHAL_DCACHE_LINESIZE - 1) / XCHAL_DCACHE_LINESIZE; 232 while (cnt--) { 233 asm volatile(" dhwb %0, 0" : : "a"(addr)); 234 addr += XCHAL_DCACHE_LINESIZE; 235 } 236 asm volatile(" dsync"); 237 } 238 } 239 240 static inline void invalidate_dcache_unaligned(u32 addr, u32 size) 241 { 242 int cnt; 243 if (size) { 244 asm volatile(" dhwbi %0, 0 ;" : : "a"(addr)); 245 cnt = (size + ((XCHAL_DCACHE_LINESIZE - 1) & addr) 246 - XCHAL_DCACHE_LINESIZE - 1) / XCHAL_DCACHE_LINESIZE; 247 while (cnt-- > 0) { 248 asm volatile(" dhi %0, %1" : : "a"(addr), 249 "n"(XCHAL_DCACHE_LINESIZE)); 250 addr += XCHAL_DCACHE_LINESIZE; 251 } 252 asm volatile(" dhwbi %0, %1" : : "a"(addr), 253 "n"(XCHAL_DCACHE_LINESIZE)); 254 asm volatile(" dsync"); 255 } 256 } 257 258 static inline void flush_invalidate_dcache_unaligned(u32 addr, u32 size) 259 { 260 u32 cnt; 261 if (size) { 262 cnt = (size + ((XCHAL_DCACHE_LINESIZE - 1) & addr) 263 + XCHAL_DCACHE_LINESIZE - 1) / XCHAL_DCACHE_LINESIZE; 264 while (cnt--) { 265 asm volatile(" dhwbi %0, 0" : : "a"(addr)); 266 addr += XCHAL_DCACHE_LINESIZE; 267 } 268 asm volatile(" dsync"); 269 } 270 } 271 272 #endif /* _XTENSA_CACHEFLUSH_H */ 273