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 * Copyright (C) 1996 David S. Miller (davem@davemloft.net) 7 * Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Ralf Baechle (ralf@gnu.org) 8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc. 9 */ 10 #include <linux/cpu_pm.h> 11 #include <linux/hardirq.h> 12 #include <linux/init.h> 13 #include <linux/highmem.h> 14 #include <linux/kernel.h> 15 #include <linux/linkage.h> 16 #include <linux/preempt.h> 17 #include <linux/sched.h> 18 #include <linux/smp.h> 19 #include <linux/mm.h> 20 #include <linux/export.h> 21 #include <linux/bitops.h> 22 23 #include <asm/bcache.h> 24 #include <asm/bootinfo.h> 25 #include <asm/cache.h> 26 #include <asm/cacheops.h> 27 #include <asm/cpu.h> 28 #include <asm/cpu-features.h> 29 #include <asm/cpu-type.h> 30 #include <asm/io.h> 31 #include <asm/page.h> 32 #include <asm/pgtable.h> 33 #include <asm/r4kcache.h> 34 #include <asm/sections.h> 35 #include <asm/mmu_context.h> 36 #include <asm/war.h> 37 #include <asm/cacheflush.h> /* for run_uncached() */ 38 #include <asm/traps.h> 39 #include <asm/dma-coherence.h> 40 #include <asm/mips-cps.h> 41 42 /* 43 * Bits describing what cache ops an SMP callback function may perform. 44 * 45 * R4K_HIT - Virtual user or kernel address based cache operations. The 46 * active_mm must be checked before using user addresses, falling 47 * back to kmap. 48 * R4K_INDEX - Index based cache operations. 49 */ 50 51 #define R4K_HIT BIT(0) 52 #define R4K_INDEX BIT(1) 53 54 /** 55 * r4k_op_needs_ipi() - Decide if a cache op needs to be done on every core. 56 * @type: Type of cache operations (R4K_HIT or R4K_INDEX). 57 * 58 * Decides whether a cache op needs to be performed on every core in the system. 59 * This may change depending on the @type of cache operation, as well as the set 60 * of online CPUs, so preemption should be disabled by the caller to prevent CPU 61 * hotplug from changing the result. 62 * 63 * Returns: 1 if the cache operation @type should be done on every core in 64 * the system. 65 * 0 if the cache operation @type is globalized and only needs to 66 * be performed on a simple CPU. 67 */ 68 static inline bool r4k_op_needs_ipi(unsigned int type) 69 { 70 /* The MIPS Coherence Manager (CM) globalizes address-based cache ops */ 71 if (type == R4K_HIT && mips_cm_present()) 72 return false; 73 74 /* 75 * Hardware doesn't globalize the required cache ops, so SMP calls may 76 * be needed, but only if there are foreign CPUs (non-siblings with 77 * separate caches). 78 */ 79 /* cpu_foreign_map[] undeclared when !CONFIG_SMP */ 80 #ifdef CONFIG_SMP 81 return !cpumask_empty(&cpu_foreign_map[0]); 82 #else 83 return false; 84 #endif 85 } 86 87 /* 88 * Special Variant of smp_call_function for use by cache functions: 89 * 90 * o No return value 91 * o collapses to normal function call on UP kernels 92 * o collapses to normal function call on systems with a single shared 93 * primary cache. 94 * o doesn't disable interrupts on the local CPU 95 */ 96 static inline void r4k_on_each_cpu(unsigned int type, 97 void (*func)(void *info), void *info) 98 { 99 preempt_disable(); 100 if (r4k_op_needs_ipi(type)) 101 smp_call_function_many(&cpu_foreign_map[smp_processor_id()], 102 func, info, 1); 103 func(info); 104 preempt_enable(); 105 } 106 107 /* 108 * Must die. 109 */ 110 static unsigned long icache_size __read_mostly; 111 static unsigned long dcache_size __read_mostly; 112 static unsigned long vcache_size __read_mostly; 113 static unsigned long scache_size __read_mostly; 114 115 /* 116 * Dummy cache handling routines for machines without boardcaches 117 */ 118 static void cache_noop(void) {} 119 120 static struct bcache_ops no_sc_ops = { 121 .bc_enable = (void *)cache_noop, 122 .bc_disable = (void *)cache_noop, 123 .bc_wback_inv = (void *)cache_noop, 124 .bc_inv = (void *)cache_noop 125 }; 126 127 struct bcache_ops *bcops = &no_sc_ops; 128 129 #define cpu_is_r4600_v1_x() ((read_c0_prid() & 0xfffffff0) == 0x00002010) 130 #define cpu_is_r4600_v2_x() ((read_c0_prid() & 0xfffffff0) == 0x00002020) 131 132 #define R4600_HIT_CACHEOP_WAR_IMPL \ 133 do { \ 134 if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x()) \ 135 *(volatile unsigned long *)CKSEG1; \ 136 if (R4600_V1_HIT_CACHEOP_WAR) \ 137 __asm__ __volatile__("nop;nop;nop;nop"); \ 138 } while (0) 139 140 static void (*r4k_blast_dcache_page)(unsigned long addr); 141 142 static inline void r4k_blast_dcache_page_dc32(unsigned long addr) 143 { 144 R4600_HIT_CACHEOP_WAR_IMPL; 145 blast_dcache32_page(addr); 146 } 147 148 static inline void r4k_blast_dcache_page_dc64(unsigned long addr) 149 { 150 blast_dcache64_page(addr); 151 } 152 153 static inline void r4k_blast_dcache_page_dc128(unsigned long addr) 154 { 155 blast_dcache128_page(addr); 156 } 157 158 static void r4k_blast_dcache_page_setup(void) 159 { 160 unsigned long dc_lsize = cpu_dcache_line_size(); 161 162 switch (dc_lsize) { 163 case 0: 164 r4k_blast_dcache_page = (void *)cache_noop; 165 break; 166 case 16: 167 r4k_blast_dcache_page = blast_dcache16_page; 168 break; 169 case 32: 170 r4k_blast_dcache_page = r4k_blast_dcache_page_dc32; 171 break; 172 case 64: 173 r4k_blast_dcache_page = r4k_blast_dcache_page_dc64; 174 break; 175 case 128: 176 r4k_blast_dcache_page = r4k_blast_dcache_page_dc128; 177 break; 178 default: 179 break; 180 } 181 } 182 183 #ifndef CONFIG_EVA 184 #define r4k_blast_dcache_user_page r4k_blast_dcache_page 185 #else 186 187 static void (*r4k_blast_dcache_user_page)(unsigned long addr); 188 189 static void r4k_blast_dcache_user_page_setup(void) 190 { 191 unsigned long dc_lsize = cpu_dcache_line_size(); 192 193 if (dc_lsize == 0) 194 r4k_blast_dcache_user_page = (void *)cache_noop; 195 else if (dc_lsize == 16) 196 r4k_blast_dcache_user_page = blast_dcache16_user_page; 197 else if (dc_lsize == 32) 198 r4k_blast_dcache_user_page = blast_dcache32_user_page; 199 else if (dc_lsize == 64) 200 r4k_blast_dcache_user_page = blast_dcache64_user_page; 201 } 202 203 #endif 204 205 static void (* r4k_blast_dcache_page_indexed)(unsigned long addr); 206 207 static void r4k_blast_dcache_page_indexed_setup(void) 208 { 209 unsigned long dc_lsize = cpu_dcache_line_size(); 210 211 if (dc_lsize == 0) 212 r4k_blast_dcache_page_indexed = (void *)cache_noop; 213 else if (dc_lsize == 16) 214 r4k_blast_dcache_page_indexed = blast_dcache16_page_indexed; 215 else if (dc_lsize == 32) 216 r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed; 217 else if (dc_lsize == 64) 218 r4k_blast_dcache_page_indexed = blast_dcache64_page_indexed; 219 else if (dc_lsize == 128) 220 r4k_blast_dcache_page_indexed = blast_dcache128_page_indexed; 221 } 222 223 void (* r4k_blast_dcache)(void); 224 EXPORT_SYMBOL(r4k_blast_dcache); 225 226 static void r4k_blast_dcache_setup(void) 227 { 228 unsigned long dc_lsize = cpu_dcache_line_size(); 229 230 if (dc_lsize == 0) 231 r4k_blast_dcache = (void *)cache_noop; 232 else if (dc_lsize == 16) 233 r4k_blast_dcache = blast_dcache16; 234 else if (dc_lsize == 32) 235 r4k_blast_dcache = blast_dcache32; 236 else if (dc_lsize == 64) 237 r4k_blast_dcache = blast_dcache64; 238 else if (dc_lsize == 128) 239 r4k_blast_dcache = blast_dcache128; 240 } 241 242 /* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */ 243 #define JUMP_TO_ALIGN(order) \ 244 __asm__ __volatile__( \ 245 "b\t1f\n\t" \ 246 ".align\t" #order "\n\t" \ 247 "1:\n\t" \ 248 ) 249 #define CACHE32_UNROLL32_ALIGN JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */ 250 #define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11) 251 252 static inline void blast_r4600_v1_icache32(void) 253 { 254 unsigned long flags; 255 256 local_irq_save(flags); 257 blast_icache32(); 258 local_irq_restore(flags); 259 } 260 261 static inline void tx49_blast_icache32(void) 262 { 263 unsigned long start = INDEX_BASE; 264 unsigned long end = start + current_cpu_data.icache.waysize; 265 unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit; 266 unsigned long ws_end = current_cpu_data.icache.ways << 267 current_cpu_data.icache.waybit; 268 unsigned long ws, addr; 269 270 CACHE32_UNROLL32_ALIGN2; 271 /* I'm in even chunk. blast odd chunks */ 272 for (ws = 0; ws < ws_end; ws += ws_inc) 273 for (addr = start + 0x400; addr < end; addr += 0x400 * 2) 274 cache_unroll(32, kernel_cache, Index_Invalidate_I, 275 addr | ws, 32); 276 CACHE32_UNROLL32_ALIGN; 277 /* I'm in odd chunk. blast even chunks */ 278 for (ws = 0; ws < ws_end; ws += ws_inc) 279 for (addr = start; addr < end; addr += 0x400 * 2) 280 cache_unroll(32, kernel_cache, Index_Invalidate_I, 281 addr | ws, 32); 282 } 283 284 static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page) 285 { 286 unsigned long flags; 287 288 local_irq_save(flags); 289 blast_icache32_page_indexed(page); 290 local_irq_restore(flags); 291 } 292 293 static inline void tx49_blast_icache32_page_indexed(unsigned long page) 294 { 295 unsigned long indexmask = current_cpu_data.icache.waysize - 1; 296 unsigned long start = INDEX_BASE + (page & indexmask); 297 unsigned long end = start + PAGE_SIZE; 298 unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit; 299 unsigned long ws_end = current_cpu_data.icache.ways << 300 current_cpu_data.icache.waybit; 301 unsigned long ws, addr; 302 303 CACHE32_UNROLL32_ALIGN2; 304 /* I'm in even chunk. blast odd chunks */ 305 for (ws = 0; ws < ws_end; ws += ws_inc) 306 for (addr = start + 0x400; addr < end; addr += 0x400 * 2) 307 cache_unroll(32, kernel_cache, Index_Invalidate_I, 308 addr | ws, 32); 309 CACHE32_UNROLL32_ALIGN; 310 /* I'm in odd chunk. blast even chunks */ 311 for (ws = 0; ws < ws_end; ws += ws_inc) 312 for (addr = start; addr < end; addr += 0x400 * 2) 313 cache_unroll(32, kernel_cache, Index_Invalidate_I, 314 addr | ws, 32); 315 } 316 317 static void (* r4k_blast_icache_page)(unsigned long addr); 318 319 static void r4k_blast_icache_page_setup(void) 320 { 321 unsigned long ic_lsize = cpu_icache_line_size(); 322 323 if (ic_lsize == 0) 324 r4k_blast_icache_page = (void *)cache_noop; 325 else if (ic_lsize == 16) 326 r4k_blast_icache_page = blast_icache16_page; 327 else if (ic_lsize == 32 && current_cpu_type() == CPU_LOONGSON2EF) 328 r4k_blast_icache_page = loongson2_blast_icache32_page; 329 else if (ic_lsize == 32) 330 r4k_blast_icache_page = blast_icache32_page; 331 else if (ic_lsize == 64) 332 r4k_blast_icache_page = blast_icache64_page; 333 else if (ic_lsize == 128) 334 r4k_blast_icache_page = blast_icache128_page; 335 } 336 337 #ifndef CONFIG_EVA 338 #define r4k_blast_icache_user_page r4k_blast_icache_page 339 #else 340 341 static void (*r4k_blast_icache_user_page)(unsigned long addr); 342 343 static void r4k_blast_icache_user_page_setup(void) 344 { 345 unsigned long ic_lsize = cpu_icache_line_size(); 346 347 if (ic_lsize == 0) 348 r4k_blast_icache_user_page = (void *)cache_noop; 349 else if (ic_lsize == 16) 350 r4k_blast_icache_user_page = blast_icache16_user_page; 351 else if (ic_lsize == 32) 352 r4k_blast_icache_user_page = blast_icache32_user_page; 353 else if (ic_lsize == 64) 354 r4k_blast_icache_user_page = blast_icache64_user_page; 355 } 356 357 #endif 358 359 static void (* r4k_blast_icache_page_indexed)(unsigned long addr); 360 361 static void r4k_blast_icache_page_indexed_setup(void) 362 { 363 unsigned long ic_lsize = cpu_icache_line_size(); 364 365 if (ic_lsize == 0) 366 r4k_blast_icache_page_indexed = (void *)cache_noop; 367 else if (ic_lsize == 16) 368 r4k_blast_icache_page_indexed = blast_icache16_page_indexed; 369 else if (ic_lsize == 32) { 370 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x()) 371 r4k_blast_icache_page_indexed = 372 blast_icache32_r4600_v1_page_indexed; 373 else if (TX49XX_ICACHE_INDEX_INV_WAR) 374 r4k_blast_icache_page_indexed = 375 tx49_blast_icache32_page_indexed; 376 else if (current_cpu_type() == CPU_LOONGSON2EF) 377 r4k_blast_icache_page_indexed = 378 loongson2_blast_icache32_page_indexed; 379 else 380 r4k_blast_icache_page_indexed = 381 blast_icache32_page_indexed; 382 } else if (ic_lsize == 64) 383 r4k_blast_icache_page_indexed = blast_icache64_page_indexed; 384 } 385 386 void (* r4k_blast_icache)(void); 387 EXPORT_SYMBOL(r4k_blast_icache); 388 389 static void r4k_blast_icache_setup(void) 390 { 391 unsigned long ic_lsize = cpu_icache_line_size(); 392 393 if (ic_lsize == 0) 394 r4k_blast_icache = (void *)cache_noop; 395 else if (ic_lsize == 16) 396 r4k_blast_icache = blast_icache16; 397 else if (ic_lsize == 32) { 398 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x()) 399 r4k_blast_icache = blast_r4600_v1_icache32; 400 else if (TX49XX_ICACHE_INDEX_INV_WAR) 401 r4k_blast_icache = tx49_blast_icache32; 402 else if (current_cpu_type() == CPU_LOONGSON2EF) 403 r4k_blast_icache = loongson2_blast_icache32; 404 else 405 r4k_blast_icache = blast_icache32; 406 } else if (ic_lsize == 64) 407 r4k_blast_icache = blast_icache64; 408 else if (ic_lsize == 128) 409 r4k_blast_icache = blast_icache128; 410 } 411 412 static void (* r4k_blast_scache_page)(unsigned long addr); 413 414 static void r4k_blast_scache_page_setup(void) 415 { 416 unsigned long sc_lsize = cpu_scache_line_size(); 417 418 if (scache_size == 0) 419 r4k_blast_scache_page = (void *)cache_noop; 420 else if (sc_lsize == 16) 421 r4k_blast_scache_page = blast_scache16_page; 422 else if (sc_lsize == 32) 423 r4k_blast_scache_page = blast_scache32_page; 424 else if (sc_lsize == 64) 425 r4k_blast_scache_page = blast_scache64_page; 426 else if (sc_lsize == 128) 427 r4k_blast_scache_page = blast_scache128_page; 428 } 429 430 static void (* r4k_blast_scache_page_indexed)(unsigned long addr); 431 432 static void r4k_blast_scache_page_indexed_setup(void) 433 { 434 unsigned long sc_lsize = cpu_scache_line_size(); 435 436 if (scache_size == 0) 437 r4k_blast_scache_page_indexed = (void *)cache_noop; 438 else if (sc_lsize == 16) 439 r4k_blast_scache_page_indexed = blast_scache16_page_indexed; 440 else if (sc_lsize == 32) 441 r4k_blast_scache_page_indexed = blast_scache32_page_indexed; 442 else if (sc_lsize == 64) 443 r4k_blast_scache_page_indexed = blast_scache64_page_indexed; 444 else if (sc_lsize == 128) 445 r4k_blast_scache_page_indexed = blast_scache128_page_indexed; 446 } 447 448 static void (* r4k_blast_scache)(void); 449 450 static void r4k_blast_scache_setup(void) 451 { 452 unsigned long sc_lsize = cpu_scache_line_size(); 453 454 if (scache_size == 0) 455 r4k_blast_scache = (void *)cache_noop; 456 else if (sc_lsize == 16) 457 r4k_blast_scache = blast_scache16; 458 else if (sc_lsize == 32) 459 r4k_blast_scache = blast_scache32; 460 else if (sc_lsize == 64) 461 r4k_blast_scache = blast_scache64; 462 else if (sc_lsize == 128) 463 r4k_blast_scache = blast_scache128; 464 } 465 466 static void (*r4k_blast_scache_node)(long node); 467 468 static void r4k_blast_scache_node_setup(void) 469 { 470 unsigned long sc_lsize = cpu_scache_line_size(); 471 472 if (current_cpu_type() != CPU_LOONGSON64) 473 r4k_blast_scache_node = (void *)cache_noop; 474 else if (sc_lsize == 16) 475 r4k_blast_scache_node = blast_scache16_node; 476 else if (sc_lsize == 32) 477 r4k_blast_scache_node = blast_scache32_node; 478 else if (sc_lsize == 64) 479 r4k_blast_scache_node = blast_scache64_node; 480 else if (sc_lsize == 128) 481 r4k_blast_scache_node = blast_scache128_node; 482 } 483 484 static inline void local_r4k___flush_cache_all(void * args) 485 { 486 switch (current_cpu_type()) { 487 case CPU_LOONGSON2EF: 488 case CPU_R4000SC: 489 case CPU_R4000MC: 490 case CPU_R4400SC: 491 case CPU_R4400MC: 492 case CPU_R10000: 493 case CPU_R12000: 494 case CPU_R14000: 495 case CPU_R16000: 496 /* 497 * These caches are inclusive caches, that is, if something 498 * is not cached in the S-cache, we know it also won't be 499 * in one of the primary caches. 500 */ 501 r4k_blast_scache(); 502 break; 503 504 case CPU_LOONGSON64: 505 /* Use get_ebase_cpunum() for both NUMA=y/n */ 506 r4k_blast_scache_node(get_ebase_cpunum() >> 2); 507 break; 508 509 case CPU_BMIPS5000: 510 r4k_blast_scache(); 511 __sync(); 512 break; 513 514 default: 515 r4k_blast_dcache(); 516 r4k_blast_icache(); 517 break; 518 } 519 } 520 521 static void r4k___flush_cache_all(void) 522 { 523 r4k_on_each_cpu(R4K_INDEX, local_r4k___flush_cache_all, NULL); 524 } 525 526 /** 527 * has_valid_asid() - Determine if an mm already has an ASID. 528 * @mm: Memory map. 529 * @type: R4K_HIT or R4K_INDEX, type of cache op. 530 * 531 * Determines whether @mm already has an ASID on any of the CPUs which cache ops 532 * of type @type within an r4k_on_each_cpu() call will affect. If 533 * r4k_on_each_cpu() does an SMP call to a single VPE in each core, then the 534 * scope of the operation is confined to sibling CPUs, otherwise all online CPUs 535 * will need to be checked. 536 * 537 * Must be called in non-preemptive context. 538 * 539 * Returns: 1 if the CPUs affected by @type cache ops have an ASID for @mm. 540 * 0 otherwise. 541 */ 542 static inline int has_valid_asid(const struct mm_struct *mm, unsigned int type) 543 { 544 unsigned int i; 545 const cpumask_t *mask = cpu_present_mask; 546 547 if (cpu_has_mmid) 548 return cpu_context(0, mm) != 0; 549 550 /* cpu_sibling_map[] undeclared when !CONFIG_SMP */ 551 #ifdef CONFIG_SMP 552 /* 553 * If r4k_on_each_cpu does SMP calls, it does them to a single VPE in 554 * each foreign core, so we only need to worry about siblings. 555 * Otherwise we need to worry about all present CPUs. 556 */ 557 if (r4k_op_needs_ipi(type)) 558 mask = &cpu_sibling_map[smp_processor_id()]; 559 #endif 560 for_each_cpu(i, mask) 561 if (cpu_context(i, mm)) 562 return 1; 563 return 0; 564 } 565 566 static void r4k__flush_cache_vmap(void) 567 { 568 r4k_blast_dcache(); 569 } 570 571 static void r4k__flush_cache_vunmap(void) 572 { 573 r4k_blast_dcache(); 574 } 575 576 /* 577 * Note: flush_tlb_range() assumes flush_cache_range() sufficiently flushes 578 * whole caches when vma is executable. 579 */ 580 static inline void local_r4k_flush_cache_range(void * args) 581 { 582 struct vm_area_struct *vma = args; 583 int exec = vma->vm_flags & VM_EXEC; 584 585 if (!has_valid_asid(vma->vm_mm, R4K_INDEX)) 586 return; 587 588 /* 589 * If dcache can alias, we must blast it since mapping is changing. 590 * If executable, we must ensure any dirty lines are written back far 591 * enough to be visible to icache. 592 */ 593 if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) 594 r4k_blast_dcache(); 595 /* If executable, blast stale lines from icache */ 596 if (exec) 597 r4k_blast_icache(); 598 } 599 600 static void r4k_flush_cache_range(struct vm_area_struct *vma, 601 unsigned long start, unsigned long end) 602 { 603 int exec = vma->vm_flags & VM_EXEC; 604 605 if (cpu_has_dc_aliases || exec) 606 r4k_on_each_cpu(R4K_INDEX, local_r4k_flush_cache_range, vma); 607 } 608 609 static inline void local_r4k_flush_cache_mm(void * args) 610 { 611 struct mm_struct *mm = args; 612 613 if (!has_valid_asid(mm, R4K_INDEX)) 614 return; 615 616 /* 617 * Kludge alert. For obscure reasons R4000SC and R4400SC go nuts if we 618 * only flush the primary caches but R1x000 behave sane ... 619 * R4000SC and R4400SC indexed S-cache ops also invalidate primary 620 * caches, so we can bail out early. 621 */ 622 if (current_cpu_type() == CPU_R4000SC || 623 current_cpu_type() == CPU_R4000MC || 624 current_cpu_type() == CPU_R4400SC || 625 current_cpu_type() == CPU_R4400MC) { 626 r4k_blast_scache(); 627 return; 628 } 629 630 r4k_blast_dcache(); 631 } 632 633 static void r4k_flush_cache_mm(struct mm_struct *mm) 634 { 635 if (!cpu_has_dc_aliases) 636 return; 637 638 r4k_on_each_cpu(R4K_INDEX, local_r4k_flush_cache_mm, mm); 639 } 640 641 struct flush_cache_page_args { 642 struct vm_area_struct *vma; 643 unsigned long addr; 644 unsigned long pfn; 645 }; 646 647 static inline void local_r4k_flush_cache_page(void *args) 648 { 649 struct flush_cache_page_args *fcp_args = args; 650 struct vm_area_struct *vma = fcp_args->vma; 651 unsigned long addr = fcp_args->addr; 652 struct page *page = pfn_to_page(fcp_args->pfn); 653 int exec = vma->vm_flags & VM_EXEC; 654 struct mm_struct *mm = vma->vm_mm; 655 int map_coherent = 0; 656 pgd_t *pgdp; 657 p4d_t *p4dp; 658 pud_t *pudp; 659 pmd_t *pmdp; 660 pte_t *ptep; 661 void *vaddr; 662 663 /* 664 * If owns no valid ASID yet, cannot possibly have gotten 665 * this page into the cache. 666 */ 667 if (!has_valid_asid(mm, R4K_HIT)) 668 return; 669 670 addr &= PAGE_MASK; 671 pgdp = pgd_offset(mm, addr); 672 p4dp = p4d_offset(pgdp, addr); 673 pudp = pud_offset(p4dp, addr); 674 pmdp = pmd_offset(pudp, addr); 675 ptep = pte_offset(pmdp, addr); 676 677 /* 678 * If the page isn't marked valid, the page cannot possibly be 679 * in the cache. 680 */ 681 if (!(pte_present(*ptep))) 682 return; 683 684 if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) 685 vaddr = NULL; 686 else { 687 /* 688 * Use kmap_coherent or kmap_atomic to do flushes for 689 * another ASID than the current one. 690 */ 691 map_coherent = (cpu_has_dc_aliases && 692 page_mapcount(page) && 693 !Page_dcache_dirty(page)); 694 if (map_coherent) 695 vaddr = kmap_coherent(page, addr); 696 else 697 vaddr = kmap_atomic(page); 698 addr = (unsigned long)vaddr; 699 } 700 701 if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) { 702 vaddr ? r4k_blast_dcache_page(addr) : 703 r4k_blast_dcache_user_page(addr); 704 if (exec && !cpu_icache_snoops_remote_store) 705 r4k_blast_scache_page(addr); 706 } 707 if (exec) { 708 if (vaddr && cpu_has_vtag_icache && mm == current->active_mm) { 709 drop_mmu_context(mm); 710 } else 711 vaddr ? r4k_blast_icache_page(addr) : 712 r4k_blast_icache_user_page(addr); 713 } 714 715 if (vaddr) { 716 if (map_coherent) 717 kunmap_coherent(); 718 else 719 kunmap_atomic(vaddr); 720 } 721 } 722 723 static void r4k_flush_cache_page(struct vm_area_struct *vma, 724 unsigned long addr, unsigned long pfn) 725 { 726 struct flush_cache_page_args args; 727 728 args.vma = vma; 729 args.addr = addr; 730 args.pfn = pfn; 731 732 r4k_on_each_cpu(R4K_HIT, local_r4k_flush_cache_page, &args); 733 } 734 735 static inline void local_r4k_flush_data_cache_page(void * addr) 736 { 737 r4k_blast_dcache_page((unsigned long) addr); 738 } 739 740 static void r4k_flush_data_cache_page(unsigned long addr) 741 { 742 if (in_atomic()) 743 local_r4k_flush_data_cache_page((void *)addr); 744 else 745 r4k_on_each_cpu(R4K_HIT, local_r4k_flush_data_cache_page, 746 (void *) addr); 747 } 748 749 struct flush_icache_range_args { 750 unsigned long start; 751 unsigned long end; 752 unsigned int type; 753 bool user; 754 }; 755 756 static inline void __local_r4k_flush_icache_range(unsigned long start, 757 unsigned long end, 758 unsigned int type, 759 bool user) 760 { 761 if (!cpu_has_ic_fills_f_dc) { 762 if (type == R4K_INDEX || 763 (type & R4K_INDEX && end - start >= dcache_size)) { 764 r4k_blast_dcache(); 765 } else { 766 R4600_HIT_CACHEOP_WAR_IMPL; 767 if (user) 768 protected_blast_dcache_range(start, end); 769 else 770 blast_dcache_range(start, end); 771 } 772 } 773 774 if (type == R4K_INDEX || 775 (type & R4K_INDEX && end - start > icache_size)) 776 r4k_blast_icache(); 777 else { 778 switch (boot_cpu_type()) { 779 case CPU_LOONGSON2EF: 780 protected_loongson2_blast_icache_range(start, end); 781 break; 782 783 default: 784 if (user) 785 protected_blast_icache_range(start, end); 786 else 787 blast_icache_range(start, end); 788 break; 789 } 790 } 791 } 792 793 static inline void local_r4k_flush_icache_range(unsigned long start, 794 unsigned long end) 795 { 796 __local_r4k_flush_icache_range(start, end, R4K_HIT | R4K_INDEX, false); 797 } 798 799 static inline void local_r4k_flush_icache_user_range(unsigned long start, 800 unsigned long end) 801 { 802 __local_r4k_flush_icache_range(start, end, R4K_HIT | R4K_INDEX, true); 803 } 804 805 static inline void local_r4k_flush_icache_range_ipi(void *args) 806 { 807 struct flush_icache_range_args *fir_args = args; 808 unsigned long start = fir_args->start; 809 unsigned long end = fir_args->end; 810 unsigned int type = fir_args->type; 811 bool user = fir_args->user; 812 813 __local_r4k_flush_icache_range(start, end, type, user); 814 } 815 816 static void __r4k_flush_icache_range(unsigned long start, unsigned long end, 817 bool user) 818 { 819 struct flush_icache_range_args args; 820 unsigned long size, cache_size; 821 822 args.start = start; 823 args.end = end; 824 args.type = R4K_HIT | R4K_INDEX; 825 args.user = user; 826 827 /* 828 * Indexed cache ops require an SMP call. 829 * Consider if that can or should be avoided. 830 */ 831 preempt_disable(); 832 if (r4k_op_needs_ipi(R4K_INDEX) && !r4k_op_needs_ipi(R4K_HIT)) { 833 /* 834 * If address-based cache ops don't require an SMP call, then 835 * use them exclusively for small flushes. 836 */ 837 size = end - start; 838 cache_size = icache_size; 839 if (!cpu_has_ic_fills_f_dc) { 840 size *= 2; 841 cache_size += dcache_size; 842 } 843 if (size <= cache_size) 844 args.type &= ~R4K_INDEX; 845 } 846 r4k_on_each_cpu(args.type, local_r4k_flush_icache_range_ipi, &args); 847 preempt_enable(); 848 instruction_hazard(); 849 } 850 851 static void r4k_flush_icache_range(unsigned long start, unsigned long end) 852 { 853 return __r4k_flush_icache_range(start, end, false); 854 } 855 856 static void r4k_flush_icache_user_range(unsigned long start, unsigned long end) 857 { 858 return __r4k_flush_icache_range(start, end, true); 859 } 860 861 #ifdef CONFIG_DMA_NONCOHERENT 862 863 static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size) 864 { 865 /* Catch bad driver code */ 866 if (WARN_ON(size == 0)) 867 return; 868 869 preempt_disable(); 870 if (cpu_has_inclusive_pcaches) { 871 if (size >= scache_size) { 872 if (current_cpu_type() != CPU_LOONGSON64) 873 r4k_blast_scache(); 874 else 875 r4k_blast_scache_node(pa_to_nid(addr)); 876 } else { 877 blast_scache_range(addr, addr + size); 878 } 879 preempt_enable(); 880 __sync(); 881 return; 882 } 883 884 /* 885 * Either no secondary cache or the available caches don't have the 886 * subset property so we have to flush the primary caches 887 * explicitly. 888 * If we would need IPI to perform an INDEX-type operation, then 889 * we have to use the HIT-type alternative as IPI cannot be used 890 * here due to interrupts possibly being disabled. 891 */ 892 if (!r4k_op_needs_ipi(R4K_INDEX) && size >= dcache_size) { 893 r4k_blast_dcache(); 894 } else { 895 R4600_HIT_CACHEOP_WAR_IMPL; 896 blast_dcache_range(addr, addr + size); 897 } 898 preempt_enable(); 899 900 bc_wback_inv(addr, size); 901 __sync(); 902 } 903 904 static void prefetch_cache_inv(unsigned long addr, unsigned long size) 905 { 906 unsigned int linesz = cpu_scache_line_size(); 907 unsigned long addr0 = addr, addr1; 908 909 addr0 &= ~(linesz - 1); 910 addr1 = (addr0 + size - 1) & ~(linesz - 1); 911 912 protected_writeback_scache_line(addr0); 913 if (likely(addr1 != addr0)) 914 protected_writeback_scache_line(addr1); 915 else 916 return; 917 918 addr0 += linesz; 919 if (likely(addr1 != addr0)) 920 protected_writeback_scache_line(addr0); 921 else 922 return; 923 924 addr1 -= linesz; 925 if (likely(addr1 > addr0)) 926 protected_writeback_scache_line(addr0); 927 } 928 929 static void r4k_dma_cache_inv(unsigned long addr, unsigned long size) 930 { 931 /* Catch bad driver code */ 932 if (WARN_ON(size == 0)) 933 return; 934 935 preempt_disable(); 936 937 if (current_cpu_type() == CPU_BMIPS5000) 938 prefetch_cache_inv(addr, size); 939 940 if (cpu_has_inclusive_pcaches) { 941 if (size >= scache_size) { 942 if (current_cpu_type() != CPU_LOONGSON64) 943 r4k_blast_scache(); 944 else 945 r4k_blast_scache_node(pa_to_nid(addr)); 946 } else { 947 /* 948 * There is no clearly documented alignment requirement 949 * for the cache instruction on MIPS processors and 950 * some processors, among them the RM5200 and RM7000 951 * QED processors will throw an address error for cache 952 * hit ops with insufficient alignment. Solved by 953 * aligning the address to cache line size. 954 */ 955 blast_inv_scache_range(addr, addr + size); 956 } 957 preempt_enable(); 958 __sync(); 959 return; 960 } 961 962 if (!r4k_op_needs_ipi(R4K_INDEX) && size >= dcache_size) { 963 r4k_blast_dcache(); 964 } else { 965 R4600_HIT_CACHEOP_WAR_IMPL; 966 blast_inv_dcache_range(addr, addr + size); 967 } 968 preempt_enable(); 969 970 bc_inv(addr, size); 971 __sync(); 972 } 973 #endif /* CONFIG_DMA_NONCOHERENT */ 974 975 static void r4k_flush_icache_all(void) 976 { 977 if (cpu_has_vtag_icache) 978 r4k_blast_icache(); 979 } 980 981 struct flush_kernel_vmap_range_args { 982 unsigned long vaddr; 983 int size; 984 }; 985 986 static inline void local_r4k_flush_kernel_vmap_range_index(void *args) 987 { 988 /* 989 * Aliases only affect the primary caches so don't bother with 990 * S-caches or T-caches. 991 */ 992 r4k_blast_dcache(); 993 } 994 995 static inline void local_r4k_flush_kernel_vmap_range(void *args) 996 { 997 struct flush_kernel_vmap_range_args *vmra = args; 998 unsigned long vaddr = vmra->vaddr; 999 int size = vmra->size; 1000 1001 /* 1002 * Aliases only affect the primary caches so don't bother with 1003 * S-caches or T-caches. 1004 */ 1005 R4600_HIT_CACHEOP_WAR_IMPL; 1006 blast_dcache_range(vaddr, vaddr + size); 1007 } 1008 1009 static void r4k_flush_kernel_vmap_range(unsigned long vaddr, int size) 1010 { 1011 struct flush_kernel_vmap_range_args args; 1012 1013 args.vaddr = (unsigned long) vaddr; 1014 args.size = size; 1015 1016 if (size >= dcache_size) 1017 r4k_on_each_cpu(R4K_INDEX, 1018 local_r4k_flush_kernel_vmap_range_index, NULL); 1019 else 1020 r4k_on_each_cpu(R4K_HIT, local_r4k_flush_kernel_vmap_range, 1021 &args); 1022 } 1023 1024 static inline void rm7k_erratum31(void) 1025 { 1026 const unsigned long ic_lsize = 32; 1027 unsigned long addr; 1028 1029 /* RM7000 erratum #31. The icache is screwed at startup. */ 1030 write_c0_taglo(0); 1031 write_c0_taghi(0); 1032 1033 for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) { 1034 __asm__ __volatile__ ( 1035 ".set push\n\t" 1036 ".set noreorder\n\t" 1037 ".set mips3\n\t" 1038 "cache\t%1, 0(%0)\n\t" 1039 "cache\t%1, 0x1000(%0)\n\t" 1040 "cache\t%1, 0x2000(%0)\n\t" 1041 "cache\t%1, 0x3000(%0)\n\t" 1042 "cache\t%2, 0(%0)\n\t" 1043 "cache\t%2, 0x1000(%0)\n\t" 1044 "cache\t%2, 0x2000(%0)\n\t" 1045 "cache\t%2, 0x3000(%0)\n\t" 1046 "cache\t%1, 0(%0)\n\t" 1047 "cache\t%1, 0x1000(%0)\n\t" 1048 "cache\t%1, 0x2000(%0)\n\t" 1049 "cache\t%1, 0x3000(%0)\n\t" 1050 ".set pop\n" 1051 : 1052 : "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill_I)); 1053 } 1054 } 1055 1056 static inline int alias_74k_erratum(struct cpuinfo_mips *c) 1057 { 1058 unsigned int imp = c->processor_id & PRID_IMP_MASK; 1059 unsigned int rev = c->processor_id & PRID_REV_MASK; 1060 int present = 0; 1061 1062 /* 1063 * Early versions of the 74K do not update the cache tags on a 1064 * vtag miss/ptag hit which can occur in the case of KSEG0/KUSEG 1065 * aliases. In this case it is better to treat the cache as always 1066 * having aliases. Also disable the synonym tag update feature 1067 * where available. In this case no opportunistic tag update will 1068 * happen where a load causes a virtual address miss but a physical 1069 * address hit during a D-cache look-up. 1070 */ 1071 switch (imp) { 1072 case PRID_IMP_74K: 1073 if (rev <= PRID_REV_ENCODE_332(2, 4, 0)) 1074 present = 1; 1075 if (rev == PRID_REV_ENCODE_332(2, 4, 0)) 1076 write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND); 1077 break; 1078 case PRID_IMP_1074K: 1079 if (rev <= PRID_REV_ENCODE_332(1, 1, 0)) { 1080 present = 1; 1081 write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND); 1082 } 1083 break; 1084 default: 1085 BUG(); 1086 } 1087 1088 return present; 1089 } 1090 1091 static void b5k_instruction_hazard(void) 1092 { 1093 __sync(); 1094 __sync(); 1095 __asm__ __volatile__( 1096 " nop; nop; nop; nop; nop; nop; nop; nop\n" 1097 " nop; nop; nop; nop; nop; nop; nop; nop\n" 1098 " nop; nop; nop; nop; nop; nop; nop; nop\n" 1099 " nop; nop; nop; nop; nop; nop; nop; nop\n" 1100 : : : "memory"); 1101 } 1102 1103 static char *way_string[] = { NULL, "direct mapped", "2-way", 1104 "3-way", "4-way", "5-way", "6-way", "7-way", "8-way", 1105 "9-way", "10-way", "11-way", "12-way", 1106 "13-way", "14-way", "15-way", "16-way", 1107 }; 1108 1109 static void probe_pcache(void) 1110 { 1111 struct cpuinfo_mips *c = ¤t_cpu_data; 1112 unsigned int config = read_c0_config(); 1113 unsigned int prid = read_c0_prid(); 1114 int has_74k_erratum = 0; 1115 unsigned long config1; 1116 unsigned int lsize; 1117 1118 switch (current_cpu_type()) { 1119 case CPU_R4600: /* QED style two way caches? */ 1120 case CPU_R4700: 1121 case CPU_R5000: 1122 case CPU_NEVADA: 1123 icache_size = 1 << (12 + ((config & CONF_IC) >> 9)); 1124 c->icache.linesz = 16 << ((config & CONF_IB) >> 5); 1125 c->icache.ways = 2; 1126 c->icache.waybit = __ffs(icache_size/2); 1127 1128 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6)); 1129 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); 1130 c->dcache.ways = 2; 1131 c->dcache.waybit= __ffs(dcache_size/2); 1132 1133 c->options |= MIPS_CPU_CACHE_CDEX_P; 1134 break; 1135 1136 case CPU_R5500: 1137 icache_size = 1 << (12 + ((config & CONF_IC) >> 9)); 1138 c->icache.linesz = 16 << ((config & CONF_IB) >> 5); 1139 c->icache.ways = 2; 1140 c->icache.waybit= 0; 1141 1142 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6)); 1143 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); 1144 c->dcache.ways = 2; 1145 c->dcache.waybit = 0; 1146 1147 c->options |= MIPS_CPU_CACHE_CDEX_P | MIPS_CPU_PREFETCH; 1148 break; 1149 1150 case CPU_TX49XX: 1151 icache_size = 1 << (12 + ((config & CONF_IC) >> 9)); 1152 c->icache.linesz = 16 << ((config & CONF_IB) >> 5); 1153 c->icache.ways = 4; 1154 c->icache.waybit= 0; 1155 1156 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6)); 1157 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); 1158 c->dcache.ways = 4; 1159 c->dcache.waybit = 0; 1160 1161 c->options |= MIPS_CPU_CACHE_CDEX_P; 1162 c->options |= MIPS_CPU_PREFETCH; 1163 break; 1164 1165 case CPU_R4000PC: 1166 case CPU_R4000SC: 1167 case CPU_R4000MC: 1168 case CPU_R4400PC: 1169 case CPU_R4400SC: 1170 case CPU_R4400MC: 1171 icache_size = 1 << (12 + ((config & CONF_IC) >> 9)); 1172 c->icache.linesz = 16 << ((config & CONF_IB) >> 5); 1173 c->icache.ways = 1; 1174 c->icache.waybit = 0; /* doesn't matter */ 1175 1176 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6)); 1177 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); 1178 c->dcache.ways = 1; 1179 c->dcache.waybit = 0; /* does not matter */ 1180 1181 c->options |= MIPS_CPU_CACHE_CDEX_P; 1182 break; 1183 1184 case CPU_R10000: 1185 case CPU_R12000: 1186 case CPU_R14000: 1187 case CPU_R16000: 1188 icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29)); 1189 c->icache.linesz = 64; 1190 c->icache.ways = 2; 1191 c->icache.waybit = 0; 1192 1193 dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26)); 1194 c->dcache.linesz = 32; 1195 c->dcache.ways = 2; 1196 c->dcache.waybit = 0; 1197 1198 c->options |= MIPS_CPU_PREFETCH; 1199 break; 1200 1201 case CPU_VR4133: 1202 write_c0_config(config & ~VR41_CONF_P4K); 1203 fallthrough; 1204 case CPU_VR4131: 1205 /* Workaround for cache instruction bug of VR4131 */ 1206 if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U || 1207 c->processor_id == 0x0c82U) { 1208 config |= 0x00400000U; 1209 if (c->processor_id == 0x0c80U) 1210 config |= VR41_CONF_BP; 1211 write_c0_config(config); 1212 } else 1213 c->options |= MIPS_CPU_CACHE_CDEX_P; 1214 1215 icache_size = 1 << (10 + ((config & CONF_IC) >> 9)); 1216 c->icache.linesz = 16 << ((config & CONF_IB) >> 5); 1217 c->icache.ways = 2; 1218 c->icache.waybit = __ffs(icache_size/2); 1219 1220 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6)); 1221 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); 1222 c->dcache.ways = 2; 1223 c->dcache.waybit = __ffs(dcache_size/2); 1224 break; 1225 1226 case CPU_VR41XX: 1227 case CPU_VR4111: 1228 case CPU_VR4121: 1229 case CPU_VR4122: 1230 case CPU_VR4181: 1231 case CPU_VR4181A: 1232 icache_size = 1 << (10 + ((config & CONF_IC) >> 9)); 1233 c->icache.linesz = 16 << ((config & CONF_IB) >> 5); 1234 c->icache.ways = 1; 1235 c->icache.waybit = 0; /* doesn't matter */ 1236 1237 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6)); 1238 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); 1239 c->dcache.ways = 1; 1240 c->dcache.waybit = 0; /* does not matter */ 1241 1242 c->options |= MIPS_CPU_CACHE_CDEX_P; 1243 break; 1244 1245 case CPU_RM7000: 1246 rm7k_erratum31(); 1247 1248 icache_size = 1 << (12 + ((config & CONF_IC) >> 9)); 1249 c->icache.linesz = 16 << ((config & CONF_IB) >> 5); 1250 c->icache.ways = 4; 1251 c->icache.waybit = __ffs(icache_size / c->icache.ways); 1252 1253 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6)); 1254 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); 1255 c->dcache.ways = 4; 1256 c->dcache.waybit = __ffs(dcache_size / c->dcache.ways); 1257 1258 c->options |= MIPS_CPU_CACHE_CDEX_P; 1259 c->options |= MIPS_CPU_PREFETCH; 1260 break; 1261 1262 case CPU_LOONGSON2EF: 1263 icache_size = 1 << (12 + ((config & CONF_IC) >> 9)); 1264 c->icache.linesz = 16 << ((config & CONF_IB) >> 5); 1265 if (prid & 0x3) 1266 c->icache.ways = 4; 1267 else 1268 c->icache.ways = 2; 1269 c->icache.waybit = 0; 1270 1271 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6)); 1272 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); 1273 if (prid & 0x3) 1274 c->dcache.ways = 4; 1275 else 1276 c->dcache.ways = 2; 1277 c->dcache.waybit = 0; 1278 break; 1279 1280 case CPU_LOONGSON64: 1281 config1 = read_c0_config1(); 1282 lsize = (config1 >> 19) & 7; 1283 if (lsize) 1284 c->icache.linesz = 2 << lsize; 1285 else 1286 c->icache.linesz = 0; 1287 c->icache.sets = 64 << ((config1 >> 22) & 7); 1288 c->icache.ways = 1 + ((config1 >> 16) & 7); 1289 icache_size = c->icache.sets * 1290 c->icache.ways * 1291 c->icache.linesz; 1292 c->icache.waybit = 0; 1293 1294 lsize = (config1 >> 10) & 7; 1295 if (lsize) 1296 c->dcache.linesz = 2 << lsize; 1297 else 1298 c->dcache.linesz = 0; 1299 c->dcache.sets = 64 << ((config1 >> 13) & 7); 1300 c->dcache.ways = 1 + ((config1 >> 7) & 7); 1301 dcache_size = c->dcache.sets * 1302 c->dcache.ways * 1303 c->dcache.linesz; 1304 c->dcache.waybit = 0; 1305 if ((c->processor_id & (PRID_IMP_MASK | PRID_REV_MASK)) >= 1306 (PRID_IMP_LOONGSON_64C | PRID_REV_LOONGSON3A_R2_0) || 1307 (c->processor_id & PRID_IMP_MASK) == PRID_IMP_LOONGSON_64R) 1308 c->options |= MIPS_CPU_PREFETCH; 1309 break; 1310 1311 case CPU_CAVIUM_OCTEON3: 1312 /* For now lie about the number of ways. */ 1313 c->icache.linesz = 128; 1314 c->icache.sets = 16; 1315 c->icache.ways = 8; 1316 c->icache.flags |= MIPS_CACHE_VTAG; 1317 icache_size = c->icache.sets * c->icache.ways * c->icache.linesz; 1318 1319 c->dcache.linesz = 128; 1320 c->dcache.ways = 8; 1321 c->dcache.sets = 8; 1322 dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz; 1323 c->options |= MIPS_CPU_PREFETCH; 1324 break; 1325 1326 default: 1327 if (!(config & MIPS_CONF_M)) 1328 panic("Don't know how to probe P-caches on this cpu."); 1329 1330 /* 1331 * So we seem to be a MIPS32 or MIPS64 CPU 1332 * So let's probe the I-cache ... 1333 */ 1334 config1 = read_c0_config1(); 1335 1336 lsize = (config1 >> 19) & 7; 1337 1338 /* IL == 7 is reserved */ 1339 if (lsize == 7) 1340 panic("Invalid icache line size"); 1341 1342 c->icache.linesz = lsize ? 2 << lsize : 0; 1343 1344 c->icache.sets = 32 << (((config1 >> 22) + 1) & 7); 1345 c->icache.ways = 1 + ((config1 >> 16) & 7); 1346 1347 icache_size = c->icache.sets * 1348 c->icache.ways * 1349 c->icache.linesz; 1350 c->icache.waybit = __ffs(icache_size/c->icache.ways); 1351 1352 if (config & MIPS_CONF_VI) 1353 c->icache.flags |= MIPS_CACHE_VTAG; 1354 1355 /* 1356 * Now probe the MIPS32 / MIPS64 data cache. 1357 */ 1358 c->dcache.flags = 0; 1359 1360 lsize = (config1 >> 10) & 7; 1361 1362 /* DL == 7 is reserved */ 1363 if (lsize == 7) 1364 panic("Invalid dcache line size"); 1365 1366 c->dcache.linesz = lsize ? 2 << lsize : 0; 1367 1368 c->dcache.sets = 32 << (((config1 >> 13) + 1) & 7); 1369 c->dcache.ways = 1 + ((config1 >> 7) & 7); 1370 1371 dcache_size = c->dcache.sets * 1372 c->dcache.ways * 1373 c->dcache.linesz; 1374 c->dcache.waybit = __ffs(dcache_size/c->dcache.ways); 1375 1376 c->options |= MIPS_CPU_PREFETCH; 1377 break; 1378 } 1379 1380 /* 1381 * Processor configuration sanity check for the R4000SC erratum 1382 * #5. With page sizes larger than 32kB there is no possibility 1383 * to get a VCE exception anymore so we don't care about this 1384 * misconfiguration. The case is rather theoretical anyway; 1385 * presumably no vendor is shipping his hardware in the "bad" 1386 * configuration. 1387 */ 1388 if ((prid & PRID_IMP_MASK) == PRID_IMP_R4000 && 1389 (prid & PRID_REV_MASK) < PRID_REV_R4400 && 1390 !(config & CONF_SC) && c->icache.linesz != 16 && 1391 PAGE_SIZE <= 0x8000) 1392 panic("Improper R4000SC processor configuration detected"); 1393 1394 /* compute a couple of other cache variables */ 1395 c->icache.waysize = icache_size / c->icache.ways; 1396 c->dcache.waysize = dcache_size / c->dcache.ways; 1397 1398 c->icache.sets = c->icache.linesz ? 1399 icache_size / (c->icache.linesz * c->icache.ways) : 0; 1400 c->dcache.sets = c->dcache.linesz ? 1401 dcache_size / (c->dcache.linesz * c->dcache.ways) : 0; 1402 1403 /* 1404 * R1x000 P-caches are odd in a positive way. They're 32kB 2-way 1405 * virtually indexed so normally would suffer from aliases. So 1406 * normally they'd suffer from aliases but magic in the hardware deals 1407 * with that for us so we don't need to take care ourselves. 1408 */ 1409 switch (current_cpu_type()) { 1410 case CPU_20KC: 1411 case CPU_25KF: 1412 case CPU_I6400: 1413 case CPU_I6500: 1414 case CPU_SB1: 1415 case CPU_SB1A: 1416 case CPU_XLR: 1417 c->dcache.flags |= MIPS_CACHE_PINDEX; 1418 break; 1419 1420 case CPU_R10000: 1421 case CPU_R12000: 1422 case CPU_R14000: 1423 case CPU_R16000: 1424 break; 1425 1426 case CPU_74K: 1427 case CPU_1074K: 1428 has_74k_erratum = alias_74k_erratum(c); 1429 fallthrough; 1430 case CPU_M14KC: 1431 case CPU_M14KEC: 1432 case CPU_24K: 1433 case CPU_34K: 1434 case CPU_1004K: 1435 case CPU_INTERAPTIV: 1436 case CPU_P5600: 1437 case CPU_PROAPTIV: 1438 case CPU_M5150: 1439 case CPU_QEMU_GENERIC: 1440 case CPU_P6600: 1441 case CPU_M6250: 1442 if (!(read_c0_config7() & MIPS_CONF7_IAR) && 1443 (c->icache.waysize > PAGE_SIZE)) 1444 c->icache.flags |= MIPS_CACHE_ALIASES; 1445 if (!has_74k_erratum && (read_c0_config7() & MIPS_CONF7_AR)) { 1446 /* 1447 * Effectively physically indexed dcache, 1448 * thus no virtual aliases. 1449 */ 1450 c->dcache.flags |= MIPS_CACHE_PINDEX; 1451 break; 1452 } 1453 fallthrough; 1454 default: 1455 if (has_74k_erratum || c->dcache.waysize > PAGE_SIZE) 1456 c->dcache.flags |= MIPS_CACHE_ALIASES; 1457 } 1458 1459 /* Physically indexed caches don't suffer from virtual aliasing */ 1460 if (c->dcache.flags & MIPS_CACHE_PINDEX) 1461 c->dcache.flags &= ~MIPS_CACHE_ALIASES; 1462 1463 /* 1464 * In systems with CM the icache fills from L2 or closer caches, and 1465 * thus sees remote stores without needing to write them back any 1466 * further than that. 1467 */ 1468 if (mips_cm_present()) 1469 c->icache.flags |= MIPS_IC_SNOOPS_REMOTE; 1470 1471 switch (current_cpu_type()) { 1472 case CPU_20KC: 1473 /* 1474 * Some older 20Kc chips doesn't have the 'VI' bit in 1475 * the config register. 1476 */ 1477 c->icache.flags |= MIPS_CACHE_VTAG; 1478 break; 1479 1480 case CPU_ALCHEMY: 1481 case CPU_I6400: 1482 case CPU_I6500: 1483 c->icache.flags |= MIPS_CACHE_IC_F_DC; 1484 break; 1485 1486 case CPU_BMIPS5000: 1487 c->icache.flags |= MIPS_CACHE_IC_F_DC; 1488 /* Cache aliases are handled in hardware; allow HIGHMEM */ 1489 c->dcache.flags &= ~MIPS_CACHE_ALIASES; 1490 break; 1491 1492 case CPU_LOONGSON2EF: 1493 /* 1494 * LOONGSON2 has 4 way icache, but when using indexed cache op, 1495 * one op will act on all 4 ways 1496 */ 1497 c->icache.ways = 1; 1498 } 1499 1500 pr_info("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n", 1501 icache_size >> 10, 1502 c->icache.flags & MIPS_CACHE_VTAG ? "VIVT" : "VIPT", 1503 way_string[c->icache.ways], c->icache.linesz); 1504 1505 pr_info("Primary data cache %ldkB, %s, %s, %s, linesize %d bytes\n", 1506 dcache_size >> 10, way_string[c->dcache.ways], 1507 (c->dcache.flags & MIPS_CACHE_PINDEX) ? "PIPT" : "VIPT", 1508 (c->dcache.flags & MIPS_CACHE_ALIASES) ? 1509 "cache aliases" : "no aliases", 1510 c->dcache.linesz); 1511 } 1512 1513 static void probe_vcache(void) 1514 { 1515 struct cpuinfo_mips *c = ¤t_cpu_data; 1516 unsigned int config2, lsize; 1517 1518 if (current_cpu_type() != CPU_LOONGSON64) 1519 return; 1520 1521 config2 = read_c0_config2(); 1522 if ((lsize = ((config2 >> 20) & 15))) 1523 c->vcache.linesz = 2 << lsize; 1524 else 1525 c->vcache.linesz = lsize; 1526 1527 c->vcache.sets = 64 << ((config2 >> 24) & 15); 1528 c->vcache.ways = 1 + ((config2 >> 16) & 15); 1529 1530 vcache_size = c->vcache.sets * c->vcache.ways * c->vcache.linesz; 1531 1532 c->vcache.waybit = 0; 1533 c->vcache.waysize = vcache_size / c->vcache.ways; 1534 1535 pr_info("Unified victim cache %ldkB %s, linesize %d bytes.\n", 1536 vcache_size >> 10, way_string[c->vcache.ways], c->vcache.linesz); 1537 } 1538 1539 /* 1540 * If you even _breathe_ on this function, look at the gcc output and make sure 1541 * it does not pop things on and off the stack for the cache sizing loop that 1542 * executes in KSEG1 space or else you will crash and burn badly. You have 1543 * been warned. 1544 */ 1545 static int probe_scache(void) 1546 { 1547 unsigned long flags, addr, begin, end, pow2; 1548 unsigned int config = read_c0_config(); 1549 struct cpuinfo_mips *c = ¤t_cpu_data; 1550 1551 if (config & CONF_SC) 1552 return 0; 1553 1554 begin = (unsigned long) &_stext; 1555 begin &= ~((4 * 1024 * 1024) - 1); 1556 end = begin + (4 * 1024 * 1024); 1557 1558 /* 1559 * This is such a bitch, you'd think they would make it easy to do 1560 * this. Away you daemons of stupidity! 1561 */ 1562 local_irq_save(flags); 1563 1564 /* Fill each size-multiple cache line with a valid tag. */ 1565 pow2 = (64 * 1024); 1566 for (addr = begin; addr < end; addr = (begin + pow2)) { 1567 unsigned long *p = (unsigned long *) addr; 1568 __asm__ __volatile__("nop" : : "r" (*p)); /* whee... */ 1569 pow2 <<= 1; 1570 } 1571 1572 /* Load first line with zero (therefore invalid) tag. */ 1573 write_c0_taglo(0); 1574 write_c0_taghi(0); 1575 __asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */ 1576 cache_op(Index_Store_Tag_I, begin); 1577 cache_op(Index_Store_Tag_D, begin); 1578 cache_op(Index_Store_Tag_SD, begin); 1579 1580 /* Now search for the wrap around point. */ 1581 pow2 = (128 * 1024); 1582 for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) { 1583 cache_op(Index_Load_Tag_SD, addr); 1584 __asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */ 1585 if (!read_c0_taglo()) 1586 break; 1587 pow2 <<= 1; 1588 } 1589 local_irq_restore(flags); 1590 addr -= begin; 1591 1592 scache_size = addr; 1593 c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22); 1594 c->scache.ways = 1; 1595 c->scache.waybit = 0; /* does not matter */ 1596 1597 return 1; 1598 } 1599 1600 static void __init loongson2_sc_init(void) 1601 { 1602 struct cpuinfo_mips *c = ¤t_cpu_data; 1603 1604 scache_size = 512*1024; 1605 c->scache.linesz = 32; 1606 c->scache.ways = 4; 1607 c->scache.waybit = 0; 1608 c->scache.waysize = scache_size / (c->scache.ways); 1609 c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways); 1610 pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n", 1611 scache_size >> 10, way_string[c->scache.ways], c->scache.linesz); 1612 1613 c->options |= MIPS_CPU_INCLUSIVE_CACHES; 1614 } 1615 1616 static void __init loongson3_sc_init(void) 1617 { 1618 struct cpuinfo_mips *c = ¤t_cpu_data; 1619 unsigned int config2, lsize; 1620 1621 config2 = read_c0_config2(); 1622 lsize = (config2 >> 4) & 15; 1623 if (lsize) 1624 c->scache.linesz = 2 << lsize; 1625 else 1626 c->scache.linesz = 0; 1627 c->scache.sets = 64 << ((config2 >> 8) & 15); 1628 c->scache.ways = 1 + (config2 & 15); 1629 1630 scache_size = c->scache.sets * 1631 c->scache.ways * 1632 c->scache.linesz; 1633 1634 /* Loongson-3 has 4-Scache banks, while Loongson-2K have only 2 banks */ 1635 if ((c->processor_id & PRID_IMP_MASK) == PRID_IMP_LOONGSON_64R) 1636 scache_size *= 2; 1637 else 1638 scache_size *= 4; 1639 1640 c->scache.waybit = 0; 1641 c->scache.waysize = scache_size / c->scache.ways; 1642 pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n", 1643 scache_size >> 10, way_string[c->scache.ways], c->scache.linesz); 1644 if (scache_size) 1645 c->options |= MIPS_CPU_INCLUSIVE_CACHES; 1646 return; 1647 } 1648 1649 extern int r5k_sc_init(void); 1650 extern int rm7k_sc_init(void); 1651 extern int mips_sc_init(void); 1652 1653 static void setup_scache(void) 1654 { 1655 struct cpuinfo_mips *c = ¤t_cpu_data; 1656 unsigned int config = read_c0_config(); 1657 int sc_present = 0; 1658 1659 /* 1660 * Do the probing thing on R4000SC and R4400SC processors. Other 1661 * processors don't have a S-cache that would be relevant to the 1662 * Linux memory management. 1663 */ 1664 switch (current_cpu_type()) { 1665 case CPU_R4000SC: 1666 case CPU_R4000MC: 1667 case CPU_R4400SC: 1668 case CPU_R4400MC: 1669 sc_present = run_uncached(probe_scache); 1670 if (sc_present) 1671 c->options |= MIPS_CPU_CACHE_CDEX_S; 1672 break; 1673 1674 case CPU_R10000: 1675 case CPU_R12000: 1676 case CPU_R14000: 1677 case CPU_R16000: 1678 scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16); 1679 c->scache.linesz = 64 << ((config >> 13) & 1); 1680 c->scache.ways = 2; 1681 c->scache.waybit= 0; 1682 sc_present = 1; 1683 break; 1684 1685 case CPU_R5000: 1686 case CPU_NEVADA: 1687 #ifdef CONFIG_R5000_CPU_SCACHE 1688 r5k_sc_init(); 1689 #endif 1690 return; 1691 1692 case CPU_RM7000: 1693 #ifdef CONFIG_RM7000_CPU_SCACHE 1694 rm7k_sc_init(); 1695 #endif 1696 return; 1697 1698 case CPU_LOONGSON2EF: 1699 loongson2_sc_init(); 1700 return; 1701 1702 case CPU_LOONGSON64: 1703 loongson3_sc_init(); 1704 return; 1705 1706 case CPU_CAVIUM_OCTEON3: 1707 case CPU_XLP: 1708 /* don't need to worry about L2, fully coherent */ 1709 return; 1710 1711 default: 1712 if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M32R2 | 1713 MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R1 | 1714 MIPS_CPU_ISA_M64R2 | MIPS_CPU_ISA_M64R6)) { 1715 #ifdef CONFIG_MIPS_CPU_SCACHE 1716 if (mips_sc_init ()) { 1717 scache_size = c->scache.ways * c->scache.sets * c->scache.linesz; 1718 printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n", 1719 scache_size >> 10, 1720 way_string[c->scache.ways], c->scache.linesz); 1721 } 1722 #else 1723 if (!(c->scache.flags & MIPS_CACHE_NOT_PRESENT)) 1724 panic("Dunno how to handle MIPS32 / MIPS64 second level cache"); 1725 #endif 1726 return; 1727 } 1728 sc_present = 0; 1729 } 1730 1731 if (!sc_present) 1732 return; 1733 1734 /* compute a couple of other cache variables */ 1735 c->scache.waysize = scache_size / c->scache.ways; 1736 1737 c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways); 1738 1739 printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n", 1740 scache_size >> 10, way_string[c->scache.ways], c->scache.linesz); 1741 1742 c->options |= MIPS_CPU_INCLUSIVE_CACHES; 1743 } 1744 1745 void au1x00_fixup_config_od(void) 1746 { 1747 /* 1748 * c0_config.od (bit 19) was write only (and read as 0) 1749 * on the early revisions of Alchemy SOCs. It disables the bus 1750 * transaction overlapping and needs to be set to fix various errata. 1751 */ 1752 switch (read_c0_prid()) { 1753 case 0x00030100: /* Au1000 DA */ 1754 case 0x00030201: /* Au1000 HA */ 1755 case 0x00030202: /* Au1000 HB */ 1756 case 0x01030200: /* Au1500 AB */ 1757 /* 1758 * Au1100 errata actually keeps silence about this bit, so we set it 1759 * just in case for those revisions that require it to be set according 1760 * to the (now gone) cpu table. 1761 */ 1762 case 0x02030200: /* Au1100 AB */ 1763 case 0x02030201: /* Au1100 BA */ 1764 case 0x02030202: /* Au1100 BC */ 1765 set_c0_config(1 << 19); 1766 break; 1767 } 1768 } 1769 1770 /* CP0 hazard avoidance. */ 1771 #define NXP_BARRIER() \ 1772 __asm__ __volatile__( \ 1773 ".set noreorder\n\t" \ 1774 "nop; nop; nop; nop; nop; nop;\n\t" \ 1775 ".set reorder\n\t") 1776 1777 static void nxp_pr4450_fixup_config(void) 1778 { 1779 unsigned long config0; 1780 1781 config0 = read_c0_config(); 1782 1783 /* clear all three cache coherency fields */ 1784 config0 &= ~(0x7 | (7 << 25) | (7 << 28)); 1785 config0 |= (((_page_cachable_default >> _CACHE_SHIFT) << 0) | 1786 ((_page_cachable_default >> _CACHE_SHIFT) << 25) | 1787 ((_page_cachable_default >> _CACHE_SHIFT) << 28)); 1788 write_c0_config(config0); 1789 NXP_BARRIER(); 1790 } 1791 1792 static int cca = -1; 1793 1794 static int __init cca_setup(char *str) 1795 { 1796 get_option(&str, &cca); 1797 1798 return 0; 1799 } 1800 1801 early_param("cca", cca_setup); 1802 1803 static void coherency_setup(void) 1804 { 1805 if (cca < 0 || cca > 7) 1806 cca = read_c0_config() & CONF_CM_CMASK; 1807 _page_cachable_default = cca << _CACHE_SHIFT; 1808 1809 pr_debug("Using cache attribute %d\n", cca); 1810 change_c0_config(CONF_CM_CMASK, cca); 1811 1812 /* 1813 * c0_status.cu=0 specifies that updates by the sc instruction use 1814 * the coherency mode specified by the TLB; 1 means cachable 1815 * coherent update on write will be used. Not all processors have 1816 * this bit and; some wire it to zero, others like Toshiba had the 1817 * silly idea of putting something else there ... 1818 */ 1819 switch (current_cpu_type()) { 1820 case CPU_R4000PC: 1821 case CPU_R4000SC: 1822 case CPU_R4000MC: 1823 case CPU_R4400PC: 1824 case CPU_R4400SC: 1825 case CPU_R4400MC: 1826 clear_c0_config(CONF_CU); 1827 break; 1828 /* 1829 * We need to catch the early Alchemy SOCs with 1830 * the write-only co_config.od bit and set it back to one on: 1831 * Au1000 rev DA, HA, HB; Au1100 AB, BA, BC, Au1500 AB 1832 */ 1833 case CPU_ALCHEMY: 1834 au1x00_fixup_config_od(); 1835 break; 1836 1837 case PRID_IMP_PR4450: 1838 nxp_pr4450_fixup_config(); 1839 break; 1840 } 1841 } 1842 1843 static void r4k_cache_error_setup(void) 1844 { 1845 extern char __weak except_vec2_generic; 1846 extern char __weak except_vec2_sb1; 1847 1848 switch (current_cpu_type()) { 1849 case CPU_SB1: 1850 case CPU_SB1A: 1851 set_uncached_handler(0x100, &except_vec2_sb1, 0x80); 1852 break; 1853 1854 default: 1855 set_uncached_handler(0x100, &except_vec2_generic, 0x80); 1856 break; 1857 } 1858 } 1859 1860 void r4k_cache_init(void) 1861 { 1862 extern void build_clear_page(void); 1863 extern void build_copy_page(void); 1864 struct cpuinfo_mips *c = ¤t_cpu_data; 1865 1866 probe_pcache(); 1867 probe_vcache(); 1868 setup_scache(); 1869 1870 r4k_blast_dcache_page_setup(); 1871 r4k_blast_dcache_page_indexed_setup(); 1872 r4k_blast_dcache_setup(); 1873 r4k_blast_icache_page_setup(); 1874 r4k_blast_icache_page_indexed_setup(); 1875 r4k_blast_icache_setup(); 1876 r4k_blast_scache_page_setup(); 1877 r4k_blast_scache_page_indexed_setup(); 1878 r4k_blast_scache_setup(); 1879 r4k_blast_scache_node_setup(); 1880 #ifdef CONFIG_EVA 1881 r4k_blast_dcache_user_page_setup(); 1882 r4k_blast_icache_user_page_setup(); 1883 #endif 1884 1885 /* 1886 * Some MIPS32 and MIPS64 processors have physically indexed caches. 1887 * This code supports virtually indexed processors and will be 1888 * unnecessarily inefficient on physically indexed processors. 1889 */ 1890 if (c->dcache.linesz && cpu_has_dc_aliases) 1891 shm_align_mask = max_t( unsigned long, 1892 c->dcache.sets * c->dcache.linesz - 1, 1893 PAGE_SIZE - 1); 1894 else 1895 shm_align_mask = PAGE_SIZE-1; 1896 1897 __flush_cache_vmap = r4k__flush_cache_vmap; 1898 __flush_cache_vunmap = r4k__flush_cache_vunmap; 1899 1900 flush_cache_all = cache_noop; 1901 __flush_cache_all = r4k___flush_cache_all; 1902 flush_cache_mm = r4k_flush_cache_mm; 1903 flush_cache_page = r4k_flush_cache_page; 1904 flush_cache_range = r4k_flush_cache_range; 1905 1906 __flush_kernel_vmap_range = r4k_flush_kernel_vmap_range; 1907 1908 flush_icache_all = r4k_flush_icache_all; 1909 local_flush_data_cache_page = local_r4k_flush_data_cache_page; 1910 flush_data_cache_page = r4k_flush_data_cache_page; 1911 flush_icache_range = r4k_flush_icache_range; 1912 local_flush_icache_range = local_r4k_flush_icache_range; 1913 __flush_icache_user_range = r4k_flush_icache_user_range; 1914 __local_flush_icache_user_range = local_r4k_flush_icache_user_range; 1915 1916 #ifdef CONFIG_DMA_NONCOHERENT 1917 #ifdef CONFIG_DMA_MAYBE_COHERENT 1918 if (coherentio == IO_COHERENCE_ENABLED || 1919 (coherentio == IO_COHERENCE_DEFAULT && hw_coherentio)) { 1920 _dma_cache_wback_inv = (void *)cache_noop; 1921 _dma_cache_wback = (void *)cache_noop; 1922 _dma_cache_inv = (void *)cache_noop; 1923 } else 1924 #endif /* CONFIG_DMA_MAYBE_COHERENT */ 1925 { 1926 _dma_cache_wback_inv = r4k_dma_cache_wback_inv; 1927 _dma_cache_wback = r4k_dma_cache_wback_inv; 1928 _dma_cache_inv = r4k_dma_cache_inv; 1929 } 1930 #endif /* CONFIG_DMA_NONCOHERENT */ 1931 1932 build_clear_page(); 1933 build_copy_page(); 1934 1935 /* 1936 * We want to run CMP kernels on core with and without coherent 1937 * caches. Therefore, do not use CONFIG_MIPS_CMP to decide whether 1938 * or not to flush caches. 1939 */ 1940 local_r4k___flush_cache_all(NULL); 1941 1942 coherency_setup(); 1943 board_cache_error_setup = r4k_cache_error_setup; 1944 1945 /* 1946 * Per-CPU overrides 1947 */ 1948 switch (current_cpu_type()) { 1949 case CPU_BMIPS4350: 1950 case CPU_BMIPS4380: 1951 /* No IPI is needed because all CPUs share the same D$ */ 1952 flush_data_cache_page = r4k_blast_dcache_page; 1953 break; 1954 case CPU_BMIPS5000: 1955 /* We lose our superpowers if L2 is disabled */ 1956 if (c->scache.flags & MIPS_CACHE_NOT_PRESENT) 1957 break; 1958 1959 /* I$ fills from D$ just by emptying the write buffers */ 1960 flush_cache_page = (void *)b5k_instruction_hazard; 1961 flush_cache_range = (void *)b5k_instruction_hazard; 1962 local_flush_data_cache_page = (void *)b5k_instruction_hazard; 1963 flush_data_cache_page = (void *)b5k_instruction_hazard; 1964 flush_icache_range = (void *)b5k_instruction_hazard; 1965 local_flush_icache_range = (void *)b5k_instruction_hazard; 1966 1967 1968 /* Optimization: an L2 flush implicitly flushes the L1 */ 1969 current_cpu_data.options |= MIPS_CPU_INCLUSIVE_CACHES; 1970 break; 1971 case CPU_LOONGSON64: 1972 /* Loongson-3 maintains cache coherency by hardware */ 1973 __flush_cache_all = cache_noop; 1974 __flush_cache_vmap = cache_noop; 1975 __flush_cache_vunmap = cache_noop; 1976 __flush_kernel_vmap_range = (void *)cache_noop; 1977 flush_cache_mm = (void *)cache_noop; 1978 flush_cache_page = (void *)cache_noop; 1979 flush_cache_range = (void *)cache_noop; 1980 flush_icache_all = (void *)cache_noop; 1981 flush_data_cache_page = (void *)cache_noop; 1982 local_flush_data_cache_page = (void *)cache_noop; 1983 break; 1984 } 1985 } 1986 1987 static int r4k_cache_pm_notifier(struct notifier_block *self, unsigned long cmd, 1988 void *v) 1989 { 1990 switch (cmd) { 1991 case CPU_PM_ENTER_FAILED: 1992 case CPU_PM_EXIT: 1993 coherency_setup(); 1994 break; 1995 } 1996 1997 return NOTIFY_OK; 1998 } 1999 2000 static struct notifier_block r4k_cache_pm_notifier_block = { 2001 .notifier_call = r4k_cache_pm_notifier, 2002 }; 2003 2004 int __init r4k_cache_init_pm(void) 2005 { 2006 return cpu_pm_register_notifier(&r4k_cache_pm_notifier_block); 2007 } 2008 arch_initcall(r4k_cache_init_pm); 2009