1 /* 2 * (C) Copyright 2010 3 * Texas Instruments, <www.ti.com> 4 * Aneesh V <aneesh@ti.com> 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 #include <linux/types.h> 9 #include <common.h> 10 #include <asm/armv7.h> 11 #include <asm/utils.h> 12 13 #define ARMV7_DCACHE_INVAL_ALL 1 14 #define ARMV7_DCACHE_CLEAN_INVAL_ALL 2 15 #define ARMV7_DCACHE_INVAL_RANGE 3 16 #define ARMV7_DCACHE_CLEAN_INVAL_RANGE 4 17 18 #ifndef CONFIG_SYS_DCACHE_OFF 19 /* 20 * Write the level and type you want to Cache Size Selection Register(CSSELR) 21 * to get size details from Current Cache Size ID Register(CCSIDR) 22 */ 23 static void set_csselr(u32 level, u32 type) 24 { 25 u32 csselr = level << 1 | type; 26 27 /* Write to Cache Size Selection Register(CSSELR) */ 28 asm volatile ("mcr p15, 2, %0, c0, c0, 0" : : "r" (csselr)); 29 } 30 31 static u32 get_ccsidr(void) 32 { 33 u32 ccsidr; 34 35 /* Read current CP15 Cache Size ID Register */ 36 asm volatile ("mrc p15, 1, %0, c0, c0, 0" : "=r" (ccsidr)); 37 return ccsidr; 38 } 39 40 static u32 get_clidr(void) 41 { 42 u32 clidr; 43 44 /* Read current CP15 Cache Level ID Register */ 45 asm volatile ("mrc p15,1,%0,c0,c0,1" : "=r" (clidr)); 46 return clidr; 47 } 48 49 static void v7_inval_dcache_level_setway(u32 level, u32 num_sets, 50 u32 num_ways, u32 way_shift, 51 u32 log2_line_len) 52 { 53 int way, set; 54 u32 setway; 55 56 /* 57 * For optimal assembly code: 58 * a. count down 59 * b. have bigger loop inside 60 */ 61 for (way = num_ways - 1; way >= 0 ; way--) { 62 for (set = num_sets - 1; set >= 0; set--) { 63 setway = (level << 1) | (set << log2_line_len) | 64 (way << way_shift); 65 /* Invalidate data/unified cache line by set/way */ 66 asm volatile (" mcr p15, 0, %0, c7, c6, 2" 67 : : "r" (setway)); 68 } 69 } 70 /* DSB to make sure the operation is complete */ 71 DSB; 72 } 73 74 static void v7_clean_inval_dcache_level_setway(u32 level, u32 num_sets, 75 u32 num_ways, u32 way_shift, 76 u32 log2_line_len) 77 { 78 int way, set; 79 u32 setway; 80 81 /* 82 * For optimal assembly code: 83 * a. count down 84 * b. have bigger loop inside 85 */ 86 for (way = num_ways - 1; way >= 0 ; way--) { 87 for (set = num_sets - 1; set >= 0; set--) { 88 setway = (level << 1) | (set << log2_line_len) | 89 (way << way_shift); 90 /* 91 * Clean & Invalidate data/unified 92 * cache line by set/way 93 */ 94 asm volatile (" mcr p15, 0, %0, c7, c14, 2" 95 : : "r" (setway)); 96 } 97 } 98 /* DSB to make sure the operation is complete */ 99 DSB; 100 } 101 102 static void v7_maint_dcache_level_setway(u32 level, u32 operation) 103 { 104 u32 ccsidr; 105 u32 num_sets, num_ways, log2_line_len, log2_num_ways; 106 u32 way_shift; 107 108 set_csselr(level, ARMV7_CSSELR_IND_DATA_UNIFIED); 109 110 ccsidr = get_ccsidr(); 111 112 log2_line_len = ((ccsidr & CCSIDR_LINE_SIZE_MASK) >> 113 CCSIDR_LINE_SIZE_OFFSET) + 2; 114 /* Converting from words to bytes */ 115 log2_line_len += 2; 116 117 num_ways = ((ccsidr & CCSIDR_ASSOCIATIVITY_MASK) >> 118 CCSIDR_ASSOCIATIVITY_OFFSET) + 1; 119 num_sets = ((ccsidr & CCSIDR_NUM_SETS_MASK) >> 120 CCSIDR_NUM_SETS_OFFSET) + 1; 121 /* 122 * According to ARMv7 ARM number of sets and number of ways need 123 * not be a power of 2 124 */ 125 log2_num_ways = log_2_n_round_up(num_ways); 126 127 way_shift = (32 - log2_num_ways); 128 if (operation == ARMV7_DCACHE_INVAL_ALL) { 129 v7_inval_dcache_level_setway(level, num_sets, num_ways, 130 way_shift, log2_line_len); 131 } else if (operation == ARMV7_DCACHE_CLEAN_INVAL_ALL) { 132 v7_clean_inval_dcache_level_setway(level, num_sets, num_ways, 133 way_shift, log2_line_len); 134 } 135 } 136 137 static void v7_maint_dcache_all(u32 operation) 138 { 139 u32 level, cache_type, level_start_bit = 0; 140 u32 clidr = get_clidr(); 141 142 for (level = 0; level < 7; level++) { 143 cache_type = (clidr >> level_start_bit) & 0x7; 144 if ((cache_type == ARMV7_CLIDR_CTYPE_DATA_ONLY) || 145 (cache_type == ARMV7_CLIDR_CTYPE_INSTRUCTION_DATA) || 146 (cache_type == ARMV7_CLIDR_CTYPE_UNIFIED)) 147 v7_maint_dcache_level_setway(level, operation); 148 level_start_bit += 3; 149 } 150 } 151 152 static void v7_dcache_clean_inval_range(u32 start, u32 stop, u32 line_len) 153 { 154 u32 mva; 155 156 /* Align start to cache line boundary */ 157 start &= ~(line_len - 1); 158 for (mva = start; mva < stop; mva = mva + line_len) { 159 /* DCCIMVAC - Clean & Invalidate data cache by MVA to PoC */ 160 asm volatile ("mcr p15, 0, %0, c7, c14, 1" : : "r" (mva)); 161 } 162 } 163 164 static void v7_dcache_inval_range(u32 start, u32 stop, u32 line_len) 165 { 166 u32 mva; 167 168 /* 169 * If start address is not aligned to cache-line do not 170 * invalidate the first cache-line 171 */ 172 if (start & (line_len - 1)) { 173 printf("ERROR: %s - start address is not aligned - 0x%08x\n", 174 __func__, start); 175 /* move to next cache line */ 176 start = (start + line_len - 1) & ~(line_len - 1); 177 } 178 179 /* 180 * If stop address is not aligned to cache-line do not 181 * invalidate the last cache-line 182 */ 183 if (stop & (line_len - 1)) { 184 printf("ERROR: %s - stop address is not aligned - 0x%08x\n", 185 __func__, stop); 186 /* align to the beginning of this cache line */ 187 stop &= ~(line_len - 1); 188 } 189 190 for (mva = start; mva < stop; mva = mva + line_len) { 191 /* DCIMVAC - Invalidate data cache by MVA to PoC */ 192 asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (mva)); 193 } 194 } 195 196 static void v7_dcache_maint_range(u32 start, u32 stop, u32 range_op) 197 { 198 u32 line_len, ccsidr; 199 200 ccsidr = get_ccsidr(); 201 line_len = ((ccsidr & CCSIDR_LINE_SIZE_MASK) >> 202 CCSIDR_LINE_SIZE_OFFSET) + 2; 203 /* Converting from words to bytes */ 204 line_len += 2; 205 /* converting from log2(linelen) to linelen */ 206 line_len = 1 << line_len; 207 208 switch (range_op) { 209 case ARMV7_DCACHE_CLEAN_INVAL_RANGE: 210 v7_dcache_clean_inval_range(start, stop, line_len); 211 break; 212 case ARMV7_DCACHE_INVAL_RANGE: 213 v7_dcache_inval_range(start, stop, line_len); 214 break; 215 } 216 217 /* DSB to make sure the operation is complete */ 218 DSB; 219 } 220 221 /* Invalidate TLB */ 222 static void v7_inval_tlb(void) 223 { 224 /* Invalidate entire unified TLB */ 225 asm volatile ("mcr p15, 0, %0, c8, c7, 0" : : "r" (0)); 226 /* Invalidate entire data TLB */ 227 asm volatile ("mcr p15, 0, %0, c8, c6, 0" : : "r" (0)); 228 /* Invalidate entire instruction TLB */ 229 asm volatile ("mcr p15, 0, %0, c8, c5, 0" : : "r" (0)); 230 /* Full system DSB - make sure that the invalidation is complete */ 231 DSB; 232 /* Full system ISB - make sure the instruction stream sees it */ 233 ISB; 234 } 235 236 void invalidate_dcache_all(void) 237 { 238 v7_maint_dcache_all(ARMV7_DCACHE_INVAL_ALL); 239 240 v7_outer_cache_inval_all(); 241 } 242 243 /* 244 * Performs a clean & invalidation of the entire data cache 245 * at all levels 246 */ 247 void flush_dcache_all(void) 248 { 249 v7_maint_dcache_all(ARMV7_DCACHE_CLEAN_INVAL_ALL); 250 251 v7_outer_cache_flush_all(); 252 } 253 254 /* 255 * Invalidates range in all levels of D-cache/unified cache used: 256 * Affects the range [start, stop - 1] 257 */ 258 void invalidate_dcache_range(unsigned long start, unsigned long stop) 259 { 260 v7_dcache_maint_range(start, stop, ARMV7_DCACHE_INVAL_RANGE); 261 262 v7_outer_cache_inval_range(start, stop); 263 } 264 265 /* 266 * Flush range(clean & invalidate) from all levels of D-cache/unified 267 * cache used: 268 * Affects the range [start, stop - 1] 269 */ 270 void flush_dcache_range(unsigned long start, unsigned long stop) 271 { 272 v7_dcache_maint_range(start, stop, ARMV7_DCACHE_CLEAN_INVAL_RANGE); 273 274 v7_outer_cache_flush_range(start, stop); 275 } 276 277 void arm_init_before_mmu(void) 278 { 279 v7_outer_cache_enable(); 280 invalidate_dcache_all(); 281 v7_inval_tlb(); 282 } 283 284 void mmu_page_table_flush(unsigned long start, unsigned long stop) 285 { 286 flush_dcache_range(start, stop); 287 v7_inval_tlb(); 288 } 289 290 /* 291 * Flush range from all levels of d-cache/unified-cache used: 292 * Affects the range [start, start + size - 1] 293 */ 294 void flush_cache(unsigned long start, unsigned long size) 295 { 296 flush_dcache_range(start, start + size); 297 } 298 #else /* #ifndef CONFIG_SYS_DCACHE_OFF */ 299 void invalidate_dcache_all(void) 300 { 301 } 302 303 void flush_dcache_all(void) 304 { 305 } 306 307 void invalidate_dcache_range(unsigned long start, unsigned long stop) 308 { 309 } 310 311 void flush_dcache_range(unsigned long start, unsigned long stop) 312 { 313 } 314 315 void arm_init_before_mmu(void) 316 { 317 } 318 319 void flush_cache(unsigned long start, unsigned long size) 320 { 321 } 322 323 void mmu_page_table_flush(unsigned long start, unsigned long stop) 324 { 325 } 326 327 void arm_init_domains(void) 328 { 329 } 330 #endif /* #ifndef CONFIG_SYS_DCACHE_OFF */ 331 332 #ifndef CONFIG_SYS_ICACHE_OFF 333 /* Invalidate entire I-cache and branch predictor array */ 334 void invalidate_icache_all(void) 335 { 336 /* 337 * Invalidate all instruction caches to PoU. 338 * Also flushes branch target cache. 339 */ 340 asm volatile ("mcr p15, 0, %0, c7, c5, 0" : : "r" (0)); 341 342 /* Invalidate entire branch predictor array */ 343 asm volatile ("mcr p15, 0, %0, c7, c5, 6" : : "r" (0)); 344 345 /* Full system DSB - make sure that the invalidation is complete */ 346 DSB; 347 348 /* ISB - make sure the instruction stream sees it */ 349 ISB; 350 } 351 #else 352 void invalidate_icache_all(void) 353 { 354 } 355 #endif 356 357 /* Stub implementations for outer cache operations */ 358 __weak void v7_outer_cache_enable(void) {} 359 __weak void v7_outer_cache_disable(void) {} 360 __weak void v7_outer_cache_flush_all(void) {} 361 __weak void v7_outer_cache_inval_all(void) {} 362 __weak void v7_outer_cache_flush_range(u32 start, u32 end) {} 363 __weak void v7_outer_cache_inval_range(u32 start, u32 end) {} 364