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/module.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 41 /* 42 * Special Variant of smp_call_function for use by cache functions: 43 * 44 * o No return value 45 * o collapses to normal function call on UP kernels 46 * o collapses to normal function call on systems with a single shared 47 * primary cache. 48 * o doesn't disable interrupts on the local CPU 49 */ 50 static inline void r4k_on_each_cpu(void (*func) (void *info), void *info) 51 { 52 preempt_disable(); 53 54 #ifndef CONFIG_MIPS_MT_SMP 55 smp_call_function(func, info, 1); 56 #endif 57 func(info); 58 preempt_enable(); 59 } 60 61 #if defined(CONFIG_MIPS_CMP) || defined(CONFIG_MIPS_CPS) 62 #define cpu_has_safe_index_cacheops 0 63 #else 64 #define cpu_has_safe_index_cacheops 1 65 #endif 66 67 /* 68 * Must die. 69 */ 70 static unsigned long icache_size __read_mostly; 71 static unsigned long dcache_size __read_mostly; 72 static unsigned long scache_size __read_mostly; 73 74 /* 75 * Dummy cache handling routines for machines without boardcaches 76 */ 77 static void cache_noop(void) {} 78 79 static struct bcache_ops no_sc_ops = { 80 .bc_enable = (void *)cache_noop, 81 .bc_disable = (void *)cache_noop, 82 .bc_wback_inv = (void *)cache_noop, 83 .bc_inv = (void *)cache_noop 84 }; 85 86 struct bcache_ops *bcops = &no_sc_ops; 87 88 #define cpu_is_r4600_v1_x() ((read_c0_prid() & 0xfffffff0) == 0x00002010) 89 #define cpu_is_r4600_v2_x() ((read_c0_prid() & 0xfffffff0) == 0x00002020) 90 91 #define R4600_HIT_CACHEOP_WAR_IMPL \ 92 do { \ 93 if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x()) \ 94 *(volatile unsigned long *)CKSEG1; \ 95 if (R4600_V1_HIT_CACHEOP_WAR) \ 96 __asm__ __volatile__("nop;nop;nop;nop"); \ 97 } while (0) 98 99 static void (*r4k_blast_dcache_page)(unsigned long addr); 100 101 static inline void r4k_blast_dcache_page_dc32(unsigned long addr) 102 { 103 R4600_HIT_CACHEOP_WAR_IMPL; 104 blast_dcache32_page(addr); 105 } 106 107 static inline void r4k_blast_dcache_page_dc64(unsigned long addr) 108 { 109 blast_dcache64_page(addr); 110 } 111 112 static inline void r4k_blast_dcache_page_dc128(unsigned long addr) 113 { 114 blast_dcache128_page(addr); 115 } 116 117 static void r4k_blast_dcache_page_setup(void) 118 { 119 unsigned long dc_lsize = cpu_dcache_line_size(); 120 121 switch (dc_lsize) { 122 case 0: 123 r4k_blast_dcache_page = (void *)cache_noop; 124 break; 125 case 16: 126 r4k_blast_dcache_page = blast_dcache16_page; 127 break; 128 case 32: 129 r4k_blast_dcache_page = r4k_blast_dcache_page_dc32; 130 break; 131 case 64: 132 r4k_blast_dcache_page = r4k_blast_dcache_page_dc64; 133 break; 134 case 128: 135 r4k_blast_dcache_page = r4k_blast_dcache_page_dc128; 136 break; 137 default: 138 break; 139 } 140 } 141 142 #ifndef CONFIG_EVA 143 #define r4k_blast_dcache_user_page r4k_blast_dcache_page 144 #else 145 146 static void (*r4k_blast_dcache_user_page)(unsigned long addr); 147 148 static void r4k_blast_dcache_user_page_setup(void) 149 { 150 unsigned long dc_lsize = cpu_dcache_line_size(); 151 152 if (dc_lsize == 0) 153 r4k_blast_dcache_user_page = (void *)cache_noop; 154 else if (dc_lsize == 16) 155 r4k_blast_dcache_user_page = blast_dcache16_user_page; 156 else if (dc_lsize == 32) 157 r4k_blast_dcache_user_page = blast_dcache32_user_page; 158 else if (dc_lsize == 64) 159 r4k_blast_dcache_user_page = blast_dcache64_user_page; 160 } 161 162 #endif 163 164 static void (* r4k_blast_dcache_page_indexed)(unsigned long addr); 165 166 static void r4k_blast_dcache_page_indexed_setup(void) 167 { 168 unsigned long dc_lsize = cpu_dcache_line_size(); 169 170 if (dc_lsize == 0) 171 r4k_blast_dcache_page_indexed = (void *)cache_noop; 172 else if (dc_lsize == 16) 173 r4k_blast_dcache_page_indexed = blast_dcache16_page_indexed; 174 else if (dc_lsize == 32) 175 r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed; 176 else if (dc_lsize == 64) 177 r4k_blast_dcache_page_indexed = blast_dcache64_page_indexed; 178 else if (dc_lsize == 128) 179 r4k_blast_dcache_page_indexed = blast_dcache128_page_indexed; 180 } 181 182 void (* r4k_blast_dcache)(void); 183 EXPORT_SYMBOL(r4k_blast_dcache); 184 185 static void r4k_blast_dcache_setup(void) 186 { 187 unsigned long dc_lsize = cpu_dcache_line_size(); 188 189 if (dc_lsize == 0) 190 r4k_blast_dcache = (void *)cache_noop; 191 else if (dc_lsize == 16) 192 r4k_blast_dcache = blast_dcache16; 193 else if (dc_lsize == 32) 194 r4k_blast_dcache = blast_dcache32; 195 else if (dc_lsize == 64) 196 r4k_blast_dcache = blast_dcache64; 197 else if (dc_lsize == 128) 198 r4k_blast_dcache = blast_dcache128; 199 } 200 201 /* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */ 202 #define JUMP_TO_ALIGN(order) \ 203 __asm__ __volatile__( \ 204 "b\t1f\n\t" \ 205 ".align\t" #order "\n\t" \ 206 "1:\n\t" \ 207 ) 208 #define CACHE32_UNROLL32_ALIGN JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */ 209 #define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11) 210 211 static inline void blast_r4600_v1_icache32(void) 212 { 213 unsigned long flags; 214 215 local_irq_save(flags); 216 blast_icache32(); 217 local_irq_restore(flags); 218 } 219 220 static inline void tx49_blast_icache32(void) 221 { 222 unsigned long start = INDEX_BASE; 223 unsigned long end = start + current_cpu_data.icache.waysize; 224 unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit; 225 unsigned long ws_end = current_cpu_data.icache.ways << 226 current_cpu_data.icache.waybit; 227 unsigned long ws, addr; 228 229 CACHE32_UNROLL32_ALIGN2; 230 /* I'm in even chunk. blast odd chunks */ 231 for (ws = 0; ws < ws_end; ws += ws_inc) 232 for (addr = start + 0x400; addr < end; addr += 0x400 * 2) 233 cache32_unroll32(addr|ws, Index_Invalidate_I); 234 CACHE32_UNROLL32_ALIGN; 235 /* I'm in odd chunk. blast even chunks */ 236 for (ws = 0; ws < ws_end; ws += ws_inc) 237 for (addr = start; addr < end; addr += 0x400 * 2) 238 cache32_unroll32(addr|ws, Index_Invalidate_I); 239 } 240 241 static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page) 242 { 243 unsigned long flags; 244 245 local_irq_save(flags); 246 blast_icache32_page_indexed(page); 247 local_irq_restore(flags); 248 } 249 250 static inline void tx49_blast_icache32_page_indexed(unsigned long page) 251 { 252 unsigned long indexmask = current_cpu_data.icache.waysize - 1; 253 unsigned long start = INDEX_BASE + (page & indexmask); 254 unsigned long end = start + PAGE_SIZE; 255 unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit; 256 unsigned long ws_end = current_cpu_data.icache.ways << 257 current_cpu_data.icache.waybit; 258 unsigned long ws, addr; 259 260 CACHE32_UNROLL32_ALIGN2; 261 /* I'm in even chunk. blast odd chunks */ 262 for (ws = 0; ws < ws_end; ws += ws_inc) 263 for (addr = start + 0x400; addr < end; addr += 0x400 * 2) 264 cache32_unroll32(addr|ws, Index_Invalidate_I); 265 CACHE32_UNROLL32_ALIGN; 266 /* I'm in odd chunk. blast even chunks */ 267 for (ws = 0; ws < ws_end; ws += ws_inc) 268 for (addr = start; addr < end; addr += 0x400 * 2) 269 cache32_unroll32(addr|ws, Index_Invalidate_I); 270 } 271 272 static void (* r4k_blast_icache_page)(unsigned long addr); 273 274 static void r4k_blast_icache_page_setup(void) 275 { 276 unsigned long ic_lsize = cpu_icache_line_size(); 277 278 if (ic_lsize == 0) 279 r4k_blast_icache_page = (void *)cache_noop; 280 else if (ic_lsize == 16) 281 r4k_blast_icache_page = blast_icache16_page; 282 else if (ic_lsize == 32 && current_cpu_type() == CPU_LOONGSON2) 283 r4k_blast_icache_page = loongson2_blast_icache32_page; 284 else if (ic_lsize == 32) 285 r4k_blast_icache_page = blast_icache32_page; 286 else if (ic_lsize == 64) 287 r4k_blast_icache_page = blast_icache64_page; 288 else if (ic_lsize == 128) 289 r4k_blast_icache_page = blast_icache128_page; 290 } 291 292 #ifndef CONFIG_EVA 293 #define r4k_blast_icache_user_page r4k_blast_icache_page 294 #else 295 296 static void (*r4k_blast_icache_user_page)(unsigned long addr); 297 298 static void __cpuinit r4k_blast_icache_user_page_setup(void) 299 { 300 unsigned long ic_lsize = cpu_icache_line_size(); 301 302 if (ic_lsize == 0) 303 r4k_blast_icache_user_page = (void *)cache_noop; 304 else if (ic_lsize == 16) 305 r4k_blast_icache_user_page = blast_icache16_user_page; 306 else if (ic_lsize == 32) 307 r4k_blast_icache_user_page = blast_icache32_user_page; 308 else if (ic_lsize == 64) 309 r4k_blast_icache_user_page = blast_icache64_user_page; 310 } 311 312 #endif 313 314 static void (* r4k_blast_icache_page_indexed)(unsigned long addr); 315 316 static void r4k_blast_icache_page_indexed_setup(void) 317 { 318 unsigned long ic_lsize = cpu_icache_line_size(); 319 320 if (ic_lsize == 0) 321 r4k_blast_icache_page_indexed = (void *)cache_noop; 322 else if (ic_lsize == 16) 323 r4k_blast_icache_page_indexed = blast_icache16_page_indexed; 324 else if (ic_lsize == 32) { 325 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x()) 326 r4k_blast_icache_page_indexed = 327 blast_icache32_r4600_v1_page_indexed; 328 else if (TX49XX_ICACHE_INDEX_INV_WAR) 329 r4k_blast_icache_page_indexed = 330 tx49_blast_icache32_page_indexed; 331 else if (current_cpu_type() == CPU_LOONGSON2) 332 r4k_blast_icache_page_indexed = 333 loongson2_blast_icache32_page_indexed; 334 else 335 r4k_blast_icache_page_indexed = 336 blast_icache32_page_indexed; 337 } else if (ic_lsize == 64) 338 r4k_blast_icache_page_indexed = blast_icache64_page_indexed; 339 } 340 341 void (* r4k_blast_icache)(void); 342 EXPORT_SYMBOL(r4k_blast_icache); 343 344 static void r4k_blast_icache_setup(void) 345 { 346 unsigned long ic_lsize = cpu_icache_line_size(); 347 348 if (ic_lsize == 0) 349 r4k_blast_icache = (void *)cache_noop; 350 else if (ic_lsize == 16) 351 r4k_blast_icache = blast_icache16; 352 else if (ic_lsize == 32) { 353 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x()) 354 r4k_blast_icache = blast_r4600_v1_icache32; 355 else if (TX49XX_ICACHE_INDEX_INV_WAR) 356 r4k_blast_icache = tx49_blast_icache32; 357 else if (current_cpu_type() == CPU_LOONGSON2) 358 r4k_blast_icache = loongson2_blast_icache32; 359 else 360 r4k_blast_icache = blast_icache32; 361 } else if (ic_lsize == 64) 362 r4k_blast_icache = blast_icache64; 363 else if (ic_lsize == 128) 364 r4k_blast_icache = blast_icache128; 365 } 366 367 static void (* r4k_blast_scache_page)(unsigned long addr); 368 369 static void r4k_blast_scache_page_setup(void) 370 { 371 unsigned long sc_lsize = cpu_scache_line_size(); 372 373 if (scache_size == 0) 374 r4k_blast_scache_page = (void *)cache_noop; 375 else if (sc_lsize == 16) 376 r4k_blast_scache_page = blast_scache16_page; 377 else if (sc_lsize == 32) 378 r4k_blast_scache_page = blast_scache32_page; 379 else if (sc_lsize == 64) 380 r4k_blast_scache_page = blast_scache64_page; 381 else if (sc_lsize == 128) 382 r4k_blast_scache_page = blast_scache128_page; 383 } 384 385 static void (* r4k_blast_scache_page_indexed)(unsigned long addr); 386 387 static void r4k_blast_scache_page_indexed_setup(void) 388 { 389 unsigned long sc_lsize = cpu_scache_line_size(); 390 391 if (scache_size == 0) 392 r4k_blast_scache_page_indexed = (void *)cache_noop; 393 else if (sc_lsize == 16) 394 r4k_blast_scache_page_indexed = blast_scache16_page_indexed; 395 else if (sc_lsize == 32) 396 r4k_blast_scache_page_indexed = blast_scache32_page_indexed; 397 else if (sc_lsize == 64) 398 r4k_blast_scache_page_indexed = blast_scache64_page_indexed; 399 else if (sc_lsize == 128) 400 r4k_blast_scache_page_indexed = blast_scache128_page_indexed; 401 } 402 403 static void (* r4k_blast_scache)(void); 404 405 static void r4k_blast_scache_setup(void) 406 { 407 unsigned long sc_lsize = cpu_scache_line_size(); 408 409 if (scache_size == 0) 410 r4k_blast_scache = (void *)cache_noop; 411 else if (sc_lsize == 16) 412 r4k_blast_scache = blast_scache16; 413 else if (sc_lsize == 32) 414 r4k_blast_scache = blast_scache32; 415 else if (sc_lsize == 64) 416 r4k_blast_scache = blast_scache64; 417 else if (sc_lsize == 128) 418 r4k_blast_scache = blast_scache128; 419 } 420 421 static inline void local_r4k___flush_cache_all(void * args) 422 { 423 switch (current_cpu_type()) { 424 case CPU_LOONGSON2: 425 case CPU_LOONGSON3: 426 case CPU_R4000SC: 427 case CPU_R4000MC: 428 case CPU_R4400SC: 429 case CPU_R4400MC: 430 case CPU_R10000: 431 case CPU_R12000: 432 case CPU_R14000: 433 /* 434 * These caches are inclusive caches, that is, if something 435 * is not cached in the S-cache, we know it also won't be 436 * in one of the primary caches. 437 */ 438 r4k_blast_scache(); 439 break; 440 441 default: 442 r4k_blast_dcache(); 443 r4k_blast_icache(); 444 break; 445 } 446 } 447 448 static void r4k___flush_cache_all(void) 449 { 450 r4k_on_each_cpu(local_r4k___flush_cache_all, NULL); 451 } 452 453 static inline int has_valid_asid(const struct mm_struct *mm) 454 { 455 #ifdef CONFIG_MIPS_MT_SMP 456 int i; 457 458 for_each_online_cpu(i) 459 if (cpu_context(i, mm)) 460 return 1; 461 462 return 0; 463 #else 464 return cpu_context(smp_processor_id(), mm); 465 #endif 466 } 467 468 static void r4k__flush_cache_vmap(void) 469 { 470 r4k_blast_dcache(); 471 } 472 473 static void r4k__flush_cache_vunmap(void) 474 { 475 r4k_blast_dcache(); 476 } 477 478 static inline void local_r4k_flush_cache_range(void * args) 479 { 480 struct vm_area_struct *vma = args; 481 int exec = vma->vm_flags & VM_EXEC; 482 483 if (!(has_valid_asid(vma->vm_mm))) 484 return; 485 486 r4k_blast_dcache(); 487 if (exec) 488 r4k_blast_icache(); 489 } 490 491 static void r4k_flush_cache_range(struct vm_area_struct *vma, 492 unsigned long start, unsigned long end) 493 { 494 int exec = vma->vm_flags & VM_EXEC; 495 496 if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) 497 r4k_on_each_cpu(local_r4k_flush_cache_range, vma); 498 } 499 500 static inline void local_r4k_flush_cache_mm(void * args) 501 { 502 struct mm_struct *mm = args; 503 504 if (!has_valid_asid(mm)) 505 return; 506 507 /* 508 * Kludge alert. For obscure reasons R4000SC and R4400SC go nuts if we 509 * only flush the primary caches but R10000 and R12000 behave sane ... 510 * R4000SC and R4400SC indexed S-cache ops also invalidate primary 511 * caches, so we can bail out early. 512 */ 513 if (current_cpu_type() == CPU_R4000SC || 514 current_cpu_type() == CPU_R4000MC || 515 current_cpu_type() == CPU_R4400SC || 516 current_cpu_type() == CPU_R4400MC) { 517 r4k_blast_scache(); 518 return; 519 } 520 521 r4k_blast_dcache(); 522 } 523 524 static void r4k_flush_cache_mm(struct mm_struct *mm) 525 { 526 if (!cpu_has_dc_aliases) 527 return; 528 529 r4k_on_each_cpu(local_r4k_flush_cache_mm, mm); 530 } 531 532 struct flush_cache_page_args { 533 struct vm_area_struct *vma; 534 unsigned long addr; 535 unsigned long pfn; 536 }; 537 538 static inline void local_r4k_flush_cache_page(void *args) 539 { 540 struct flush_cache_page_args *fcp_args = args; 541 struct vm_area_struct *vma = fcp_args->vma; 542 unsigned long addr = fcp_args->addr; 543 struct page *page = pfn_to_page(fcp_args->pfn); 544 int exec = vma->vm_flags & VM_EXEC; 545 struct mm_struct *mm = vma->vm_mm; 546 int map_coherent = 0; 547 pgd_t *pgdp; 548 pud_t *pudp; 549 pmd_t *pmdp; 550 pte_t *ptep; 551 void *vaddr; 552 553 /* 554 * If ownes no valid ASID yet, cannot possibly have gotten 555 * this page into the cache. 556 */ 557 if (!has_valid_asid(mm)) 558 return; 559 560 addr &= PAGE_MASK; 561 pgdp = pgd_offset(mm, addr); 562 pudp = pud_offset(pgdp, addr); 563 pmdp = pmd_offset(pudp, addr); 564 ptep = pte_offset(pmdp, addr); 565 566 /* 567 * If the page isn't marked valid, the page cannot possibly be 568 * in the cache. 569 */ 570 if (!(pte_present(*ptep))) 571 return; 572 573 if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) 574 vaddr = NULL; 575 else { 576 /* 577 * Use kmap_coherent or kmap_atomic to do flushes for 578 * another ASID than the current one. 579 */ 580 map_coherent = (cpu_has_dc_aliases && 581 page_mapped(page) && !Page_dcache_dirty(page)); 582 if (map_coherent) 583 vaddr = kmap_coherent(page, addr); 584 else 585 vaddr = kmap_atomic(page); 586 addr = (unsigned long)vaddr; 587 } 588 589 if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) { 590 vaddr ? r4k_blast_dcache_page(addr) : 591 r4k_blast_dcache_user_page(addr); 592 if (exec && !cpu_icache_snoops_remote_store) 593 r4k_blast_scache_page(addr); 594 } 595 if (exec) { 596 if (vaddr && cpu_has_vtag_icache && mm == current->active_mm) { 597 int cpu = smp_processor_id(); 598 599 if (cpu_context(cpu, mm) != 0) 600 drop_mmu_context(mm, cpu); 601 } else 602 vaddr ? r4k_blast_icache_page(addr) : 603 r4k_blast_icache_user_page(addr); 604 } 605 606 if (vaddr) { 607 if (map_coherent) 608 kunmap_coherent(); 609 else 610 kunmap_atomic(vaddr); 611 } 612 } 613 614 static void r4k_flush_cache_page(struct vm_area_struct *vma, 615 unsigned long addr, unsigned long pfn) 616 { 617 struct flush_cache_page_args args; 618 619 args.vma = vma; 620 args.addr = addr; 621 args.pfn = pfn; 622 623 r4k_on_each_cpu(local_r4k_flush_cache_page, &args); 624 } 625 626 static inline void local_r4k_flush_data_cache_page(void * addr) 627 { 628 r4k_blast_dcache_page((unsigned long) addr); 629 } 630 631 static void r4k_flush_data_cache_page(unsigned long addr) 632 { 633 if (in_atomic()) 634 local_r4k_flush_data_cache_page((void *)addr); 635 else 636 r4k_on_each_cpu(local_r4k_flush_data_cache_page, (void *) addr); 637 } 638 639 struct flush_icache_range_args { 640 unsigned long start; 641 unsigned long end; 642 }; 643 644 static inline void local_r4k_flush_icache_range(unsigned long start, unsigned long end) 645 { 646 if (!cpu_has_ic_fills_f_dc) { 647 if (end - start >= dcache_size) { 648 r4k_blast_dcache(); 649 } else { 650 R4600_HIT_CACHEOP_WAR_IMPL; 651 protected_blast_dcache_range(start, end); 652 } 653 } 654 655 if (end - start > icache_size) 656 r4k_blast_icache(); 657 else { 658 switch (boot_cpu_type()) { 659 case CPU_LOONGSON2: 660 protected_loongson2_blast_icache_range(start, end); 661 break; 662 663 default: 664 protected_blast_icache_range(start, end); 665 break; 666 } 667 } 668 #ifdef CONFIG_EVA 669 /* 670 * Due to all possible segment mappings, there might cache aliases 671 * caused by the bootloader being in non-EVA mode, and the CPU switching 672 * to EVA during early kernel init. It's best to flush the scache 673 * to avoid having secondary cores fetching stale data and lead to 674 * kernel crashes. 675 */ 676 bc_wback_inv(start, (end - start)); 677 __sync(); 678 #endif 679 } 680 681 static inline void local_r4k_flush_icache_range_ipi(void *args) 682 { 683 struct flush_icache_range_args *fir_args = args; 684 unsigned long start = fir_args->start; 685 unsigned long end = fir_args->end; 686 687 local_r4k_flush_icache_range(start, end); 688 } 689 690 static void r4k_flush_icache_range(unsigned long start, unsigned long end) 691 { 692 struct flush_icache_range_args args; 693 694 args.start = start; 695 args.end = end; 696 697 r4k_on_each_cpu(local_r4k_flush_icache_range_ipi, &args); 698 instruction_hazard(); 699 } 700 701 #if defined(CONFIG_DMA_NONCOHERENT) || defined(CONFIG_DMA_MAYBE_COHERENT) 702 703 static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size) 704 { 705 /* Catch bad driver code */ 706 BUG_ON(size == 0); 707 708 preempt_disable(); 709 if (cpu_has_inclusive_pcaches) { 710 if (size >= scache_size) 711 r4k_blast_scache(); 712 else 713 blast_scache_range(addr, addr + size); 714 preempt_enable(); 715 __sync(); 716 return; 717 } 718 719 /* 720 * Either no secondary cache or the available caches don't have the 721 * subset property so we have to flush the primary caches 722 * explicitly 723 */ 724 if (cpu_has_safe_index_cacheops && size >= dcache_size) { 725 r4k_blast_dcache(); 726 } else { 727 R4600_HIT_CACHEOP_WAR_IMPL; 728 blast_dcache_range(addr, addr + size); 729 } 730 preempt_enable(); 731 732 bc_wback_inv(addr, size); 733 __sync(); 734 } 735 736 static void r4k_dma_cache_inv(unsigned long addr, unsigned long size) 737 { 738 /* Catch bad driver code */ 739 BUG_ON(size == 0); 740 741 preempt_disable(); 742 if (cpu_has_inclusive_pcaches) { 743 if (size >= scache_size) 744 r4k_blast_scache(); 745 else { 746 /* 747 * There is no clearly documented alignment requirement 748 * for the cache instruction on MIPS processors and 749 * some processors, among them the RM5200 and RM7000 750 * QED processors will throw an address error for cache 751 * hit ops with insufficient alignment. Solved by 752 * aligning the address to cache line size. 753 */ 754 blast_inv_scache_range(addr, addr + size); 755 } 756 preempt_enable(); 757 __sync(); 758 return; 759 } 760 761 if (cpu_has_safe_index_cacheops && size >= dcache_size) { 762 r4k_blast_dcache(); 763 } else { 764 R4600_HIT_CACHEOP_WAR_IMPL; 765 blast_inv_dcache_range(addr, addr + size); 766 } 767 preempt_enable(); 768 769 bc_inv(addr, size); 770 __sync(); 771 } 772 #endif /* CONFIG_DMA_NONCOHERENT || CONFIG_DMA_MAYBE_COHERENT */ 773 774 /* 775 * While we're protected against bad userland addresses we don't care 776 * very much about what happens in that case. Usually a segmentation 777 * fault will dump the process later on anyway ... 778 */ 779 static void local_r4k_flush_cache_sigtramp(void * arg) 780 { 781 unsigned long ic_lsize = cpu_icache_line_size(); 782 unsigned long dc_lsize = cpu_dcache_line_size(); 783 unsigned long sc_lsize = cpu_scache_line_size(); 784 unsigned long addr = (unsigned long) arg; 785 786 R4600_HIT_CACHEOP_WAR_IMPL; 787 if (dc_lsize) 788 protected_writeback_dcache_line(addr & ~(dc_lsize - 1)); 789 if (!cpu_icache_snoops_remote_store && scache_size) 790 protected_writeback_scache_line(addr & ~(sc_lsize - 1)); 791 if (ic_lsize) 792 protected_flush_icache_line(addr & ~(ic_lsize - 1)); 793 if (MIPS4K_ICACHE_REFILL_WAR) { 794 __asm__ __volatile__ ( 795 ".set push\n\t" 796 ".set noat\n\t" 797 ".set mips3\n\t" 798 #ifdef CONFIG_32BIT 799 "la $at,1f\n\t" 800 #endif 801 #ifdef CONFIG_64BIT 802 "dla $at,1f\n\t" 803 #endif 804 "cache %0,($at)\n\t" 805 "nop; nop; nop\n" 806 "1:\n\t" 807 ".set pop" 808 : 809 : "i" (Hit_Invalidate_I)); 810 } 811 if (MIPS_CACHE_SYNC_WAR) 812 __asm__ __volatile__ ("sync"); 813 } 814 815 static void r4k_flush_cache_sigtramp(unsigned long addr) 816 { 817 r4k_on_each_cpu(local_r4k_flush_cache_sigtramp, (void *) addr); 818 } 819 820 static void r4k_flush_icache_all(void) 821 { 822 if (cpu_has_vtag_icache) 823 r4k_blast_icache(); 824 } 825 826 struct flush_kernel_vmap_range_args { 827 unsigned long vaddr; 828 int size; 829 }; 830 831 static inline void local_r4k_flush_kernel_vmap_range(void *args) 832 { 833 struct flush_kernel_vmap_range_args *vmra = args; 834 unsigned long vaddr = vmra->vaddr; 835 int size = vmra->size; 836 837 /* 838 * Aliases only affect the primary caches so don't bother with 839 * S-caches or T-caches. 840 */ 841 if (cpu_has_safe_index_cacheops && size >= dcache_size) 842 r4k_blast_dcache(); 843 else { 844 R4600_HIT_CACHEOP_WAR_IMPL; 845 blast_dcache_range(vaddr, vaddr + size); 846 } 847 } 848 849 static void r4k_flush_kernel_vmap_range(unsigned long vaddr, int size) 850 { 851 struct flush_kernel_vmap_range_args args; 852 853 args.vaddr = (unsigned long) vaddr; 854 args.size = size; 855 856 r4k_on_each_cpu(local_r4k_flush_kernel_vmap_range, &args); 857 } 858 859 static inline void rm7k_erratum31(void) 860 { 861 const unsigned long ic_lsize = 32; 862 unsigned long addr; 863 864 /* RM7000 erratum #31. The icache is screwed at startup. */ 865 write_c0_taglo(0); 866 write_c0_taghi(0); 867 868 for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) { 869 __asm__ __volatile__ ( 870 ".set push\n\t" 871 ".set noreorder\n\t" 872 ".set mips3\n\t" 873 "cache\t%1, 0(%0)\n\t" 874 "cache\t%1, 0x1000(%0)\n\t" 875 "cache\t%1, 0x2000(%0)\n\t" 876 "cache\t%1, 0x3000(%0)\n\t" 877 "cache\t%2, 0(%0)\n\t" 878 "cache\t%2, 0x1000(%0)\n\t" 879 "cache\t%2, 0x2000(%0)\n\t" 880 "cache\t%2, 0x3000(%0)\n\t" 881 "cache\t%1, 0(%0)\n\t" 882 "cache\t%1, 0x1000(%0)\n\t" 883 "cache\t%1, 0x2000(%0)\n\t" 884 "cache\t%1, 0x3000(%0)\n\t" 885 ".set pop\n" 886 : 887 : "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill)); 888 } 889 } 890 891 static inline void alias_74k_erratum(struct cpuinfo_mips *c) 892 { 893 unsigned int imp = c->processor_id & PRID_IMP_MASK; 894 unsigned int rev = c->processor_id & PRID_REV_MASK; 895 896 /* 897 * Early versions of the 74K do not update the cache tags on a 898 * vtag miss/ptag hit which can occur in the case of KSEG0/KUSEG 899 * aliases. In this case it is better to treat the cache as always 900 * having aliases. 901 */ 902 switch (imp) { 903 case PRID_IMP_74K: 904 if (rev <= PRID_REV_ENCODE_332(2, 4, 0)) 905 c->dcache.flags |= MIPS_CACHE_VTAG; 906 if (rev == PRID_REV_ENCODE_332(2, 4, 0)) 907 write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND); 908 break; 909 case PRID_IMP_1074K: 910 if (rev <= PRID_REV_ENCODE_332(1, 1, 0)) { 911 c->dcache.flags |= MIPS_CACHE_VTAG; 912 write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND); 913 } 914 break; 915 default: 916 BUG(); 917 } 918 } 919 920 static char *way_string[] = { NULL, "direct mapped", "2-way", 921 "3-way", "4-way", "5-way", "6-way", "7-way", "8-way" 922 }; 923 924 static void probe_pcache(void) 925 { 926 struct cpuinfo_mips *c = ¤t_cpu_data; 927 unsigned int config = read_c0_config(); 928 unsigned int prid = read_c0_prid(); 929 unsigned long config1; 930 unsigned int lsize; 931 932 switch (current_cpu_type()) { 933 case CPU_R4600: /* QED style two way caches? */ 934 case CPU_R4700: 935 case CPU_R5000: 936 case CPU_NEVADA: 937 icache_size = 1 << (12 + ((config & CONF_IC) >> 9)); 938 c->icache.linesz = 16 << ((config & CONF_IB) >> 5); 939 c->icache.ways = 2; 940 c->icache.waybit = __ffs(icache_size/2); 941 942 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6)); 943 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); 944 c->dcache.ways = 2; 945 c->dcache.waybit= __ffs(dcache_size/2); 946 947 c->options |= MIPS_CPU_CACHE_CDEX_P; 948 break; 949 950 case CPU_R5432: 951 case CPU_R5500: 952 icache_size = 1 << (12 + ((config & CONF_IC) >> 9)); 953 c->icache.linesz = 16 << ((config & CONF_IB) >> 5); 954 c->icache.ways = 2; 955 c->icache.waybit= 0; 956 957 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6)); 958 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); 959 c->dcache.ways = 2; 960 c->dcache.waybit = 0; 961 962 c->options |= MIPS_CPU_CACHE_CDEX_P | MIPS_CPU_PREFETCH; 963 break; 964 965 case CPU_TX49XX: 966 icache_size = 1 << (12 + ((config & CONF_IC) >> 9)); 967 c->icache.linesz = 16 << ((config & CONF_IB) >> 5); 968 c->icache.ways = 4; 969 c->icache.waybit= 0; 970 971 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6)); 972 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); 973 c->dcache.ways = 4; 974 c->dcache.waybit = 0; 975 976 c->options |= MIPS_CPU_CACHE_CDEX_P; 977 c->options |= MIPS_CPU_PREFETCH; 978 break; 979 980 case CPU_R4000PC: 981 case CPU_R4000SC: 982 case CPU_R4000MC: 983 case CPU_R4400PC: 984 case CPU_R4400SC: 985 case CPU_R4400MC: 986 case CPU_R4300: 987 icache_size = 1 << (12 + ((config & CONF_IC) >> 9)); 988 c->icache.linesz = 16 << ((config & CONF_IB) >> 5); 989 c->icache.ways = 1; 990 c->icache.waybit = 0; /* doesn't matter */ 991 992 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6)); 993 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); 994 c->dcache.ways = 1; 995 c->dcache.waybit = 0; /* does not matter */ 996 997 c->options |= MIPS_CPU_CACHE_CDEX_P; 998 break; 999 1000 case CPU_R10000: 1001 case CPU_R12000: 1002 case CPU_R14000: 1003 icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29)); 1004 c->icache.linesz = 64; 1005 c->icache.ways = 2; 1006 c->icache.waybit = 0; 1007 1008 dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26)); 1009 c->dcache.linesz = 32; 1010 c->dcache.ways = 2; 1011 c->dcache.waybit = 0; 1012 1013 c->options |= MIPS_CPU_PREFETCH; 1014 break; 1015 1016 case CPU_VR4133: 1017 write_c0_config(config & ~VR41_CONF_P4K); 1018 case CPU_VR4131: 1019 /* Workaround for cache instruction bug of VR4131 */ 1020 if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U || 1021 c->processor_id == 0x0c82U) { 1022 config |= 0x00400000U; 1023 if (c->processor_id == 0x0c80U) 1024 config |= VR41_CONF_BP; 1025 write_c0_config(config); 1026 } else 1027 c->options |= MIPS_CPU_CACHE_CDEX_P; 1028 1029 icache_size = 1 << (10 + ((config & CONF_IC) >> 9)); 1030 c->icache.linesz = 16 << ((config & CONF_IB) >> 5); 1031 c->icache.ways = 2; 1032 c->icache.waybit = __ffs(icache_size/2); 1033 1034 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6)); 1035 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); 1036 c->dcache.ways = 2; 1037 c->dcache.waybit = __ffs(dcache_size/2); 1038 break; 1039 1040 case CPU_VR41XX: 1041 case CPU_VR4111: 1042 case CPU_VR4121: 1043 case CPU_VR4122: 1044 case CPU_VR4181: 1045 case CPU_VR4181A: 1046 icache_size = 1 << (10 + ((config & CONF_IC) >> 9)); 1047 c->icache.linesz = 16 << ((config & CONF_IB) >> 5); 1048 c->icache.ways = 1; 1049 c->icache.waybit = 0; /* doesn't matter */ 1050 1051 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6)); 1052 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); 1053 c->dcache.ways = 1; 1054 c->dcache.waybit = 0; /* does not matter */ 1055 1056 c->options |= MIPS_CPU_CACHE_CDEX_P; 1057 break; 1058 1059 case CPU_RM7000: 1060 rm7k_erratum31(); 1061 1062 icache_size = 1 << (12 + ((config & CONF_IC) >> 9)); 1063 c->icache.linesz = 16 << ((config & CONF_IB) >> 5); 1064 c->icache.ways = 4; 1065 c->icache.waybit = __ffs(icache_size / c->icache.ways); 1066 1067 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6)); 1068 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); 1069 c->dcache.ways = 4; 1070 c->dcache.waybit = __ffs(dcache_size / c->dcache.ways); 1071 1072 c->options |= MIPS_CPU_CACHE_CDEX_P; 1073 c->options |= MIPS_CPU_PREFETCH; 1074 break; 1075 1076 case CPU_LOONGSON2: 1077 icache_size = 1 << (12 + ((config & CONF_IC) >> 9)); 1078 c->icache.linesz = 16 << ((config & CONF_IB) >> 5); 1079 if (prid & 0x3) 1080 c->icache.ways = 4; 1081 else 1082 c->icache.ways = 2; 1083 c->icache.waybit = 0; 1084 1085 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6)); 1086 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); 1087 if (prid & 0x3) 1088 c->dcache.ways = 4; 1089 else 1090 c->dcache.ways = 2; 1091 c->dcache.waybit = 0; 1092 break; 1093 1094 case CPU_LOONGSON3: 1095 config1 = read_c0_config1(); 1096 lsize = (config1 >> 19) & 7; 1097 if (lsize) 1098 c->icache.linesz = 2 << lsize; 1099 else 1100 c->icache.linesz = 0; 1101 c->icache.sets = 64 << ((config1 >> 22) & 7); 1102 c->icache.ways = 1 + ((config1 >> 16) & 7); 1103 icache_size = c->icache.sets * 1104 c->icache.ways * 1105 c->icache.linesz; 1106 c->icache.waybit = 0; 1107 1108 lsize = (config1 >> 10) & 7; 1109 if (lsize) 1110 c->dcache.linesz = 2 << lsize; 1111 else 1112 c->dcache.linesz = 0; 1113 c->dcache.sets = 64 << ((config1 >> 13) & 7); 1114 c->dcache.ways = 1 + ((config1 >> 7) & 7); 1115 dcache_size = c->dcache.sets * 1116 c->dcache.ways * 1117 c->dcache.linesz; 1118 c->dcache.waybit = 0; 1119 break; 1120 1121 case CPU_CAVIUM_OCTEON3: 1122 /* For now lie about the number of ways. */ 1123 c->icache.linesz = 128; 1124 c->icache.sets = 16; 1125 c->icache.ways = 8; 1126 c->icache.flags |= MIPS_CACHE_VTAG; 1127 icache_size = c->icache.sets * c->icache.ways * c->icache.linesz; 1128 1129 c->dcache.linesz = 128; 1130 c->dcache.ways = 8; 1131 c->dcache.sets = 8; 1132 dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz; 1133 c->options |= MIPS_CPU_PREFETCH; 1134 break; 1135 1136 default: 1137 if (!(config & MIPS_CONF_M)) 1138 panic("Don't know how to probe P-caches on this cpu."); 1139 1140 /* 1141 * So we seem to be a MIPS32 or MIPS64 CPU 1142 * So let's probe the I-cache ... 1143 */ 1144 config1 = read_c0_config1(); 1145 1146 lsize = (config1 >> 19) & 7; 1147 1148 /* IL == 7 is reserved */ 1149 if (lsize == 7) 1150 panic("Invalid icache line size"); 1151 1152 c->icache.linesz = lsize ? 2 << lsize : 0; 1153 1154 c->icache.sets = 32 << (((config1 >> 22) + 1) & 7); 1155 c->icache.ways = 1 + ((config1 >> 16) & 7); 1156 1157 icache_size = c->icache.sets * 1158 c->icache.ways * 1159 c->icache.linesz; 1160 c->icache.waybit = __ffs(icache_size/c->icache.ways); 1161 1162 if (config & 0x8) /* VI bit */ 1163 c->icache.flags |= MIPS_CACHE_VTAG; 1164 1165 /* 1166 * Now probe the MIPS32 / MIPS64 data cache. 1167 */ 1168 c->dcache.flags = 0; 1169 1170 lsize = (config1 >> 10) & 7; 1171 1172 /* DL == 7 is reserved */ 1173 if (lsize == 7) 1174 panic("Invalid dcache line size"); 1175 1176 c->dcache.linesz = lsize ? 2 << lsize : 0; 1177 1178 c->dcache.sets = 32 << (((config1 >> 13) + 1) & 7); 1179 c->dcache.ways = 1 + ((config1 >> 7) & 7); 1180 1181 dcache_size = c->dcache.sets * 1182 c->dcache.ways * 1183 c->dcache.linesz; 1184 c->dcache.waybit = __ffs(dcache_size/c->dcache.ways); 1185 1186 c->options |= MIPS_CPU_PREFETCH; 1187 break; 1188 } 1189 1190 /* 1191 * Processor configuration sanity check for the R4000SC erratum 1192 * #5. With page sizes larger than 32kB there is no possibility 1193 * to get a VCE exception anymore so we don't care about this 1194 * misconfiguration. The case is rather theoretical anyway; 1195 * presumably no vendor is shipping his hardware in the "bad" 1196 * configuration. 1197 */ 1198 if ((prid & PRID_IMP_MASK) == PRID_IMP_R4000 && 1199 (prid & PRID_REV_MASK) < PRID_REV_R4400 && 1200 !(config & CONF_SC) && c->icache.linesz != 16 && 1201 PAGE_SIZE <= 0x8000) 1202 panic("Improper R4000SC processor configuration detected"); 1203 1204 /* compute a couple of other cache variables */ 1205 c->icache.waysize = icache_size / c->icache.ways; 1206 c->dcache.waysize = dcache_size / c->dcache.ways; 1207 1208 c->icache.sets = c->icache.linesz ? 1209 icache_size / (c->icache.linesz * c->icache.ways) : 0; 1210 c->dcache.sets = c->dcache.linesz ? 1211 dcache_size / (c->dcache.linesz * c->dcache.ways) : 0; 1212 1213 /* 1214 * R10000 and R12000 P-caches are odd in a positive way. They're 32kB 1215 * 2-way virtually indexed so normally would suffer from aliases. So 1216 * normally they'd suffer from aliases but magic in the hardware deals 1217 * with that for us so we don't need to take care ourselves. 1218 */ 1219 switch (current_cpu_type()) { 1220 case CPU_20KC: 1221 case CPU_25KF: 1222 case CPU_SB1: 1223 case CPU_SB1A: 1224 case CPU_XLR: 1225 c->dcache.flags |= MIPS_CACHE_PINDEX; 1226 break; 1227 1228 case CPU_R10000: 1229 case CPU_R12000: 1230 case CPU_R14000: 1231 break; 1232 1233 case CPU_74K: 1234 case CPU_1074K: 1235 alias_74k_erratum(c); 1236 /* Fall through. */ 1237 case CPU_M14KC: 1238 case CPU_M14KEC: 1239 case CPU_24K: 1240 case CPU_34K: 1241 case CPU_1004K: 1242 case CPU_INTERAPTIV: 1243 case CPU_P5600: 1244 case CPU_PROAPTIV: 1245 case CPU_M5150: 1246 if (!(read_c0_config7() & MIPS_CONF7_IAR) && 1247 (c->icache.waysize > PAGE_SIZE)) 1248 c->icache.flags |= MIPS_CACHE_ALIASES; 1249 if (read_c0_config7() & MIPS_CONF7_AR) { 1250 /* 1251 * Effectively physically indexed dcache, 1252 * thus no virtual aliases. 1253 */ 1254 c->dcache.flags |= MIPS_CACHE_PINDEX; 1255 break; 1256 } 1257 default: 1258 if (c->dcache.waysize > PAGE_SIZE) 1259 c->dcache.flags |= MIPS_CACHE_ALIASES; 1260 } 1261 1262 switch (current_cpu_type()) { 1263 case CPU_20KC: 1264 /* 1265 * Some older 20Kc chips doesn't have the 'VI' bit in 1266 * the config register. 1267 */ 1268 c->icache.flags |= MIPS_CACHE_VTAG; 1269 break; 1270 1271 case CPU_ALCHEMY: 1272 c->icache.flags |= MIPS_CACHE_IC_F_DC; 1273 break; 1274 1275 case CPU_LOONGSON2: 1276 /* 1277 * LOONGSON2 has 4 way icache, but when using indexed cache op, 1278 * one op will act on all 4 ways 1279 */ 1280 c->icache.ways = 1; 1281 } 1282 1283 printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n", 1284 icache_size >> 10, 1285 c->icache.flags & MIPS_CACHE_VTAG ? "VIVT" : "VIPT", 1286 way_string[c->icache.ways], c->icache.linesz); 1287 1288 printk("Primary data cache %ldkB, %s, %s, %s, linesize %d bytes\n", 1289 dcache_size >> 10, way_string[c->dcache.ways], 1290 (c->dcache.flags & MIPS_CACHE_PINDEX) ? "PIPT" : "VIPT", 1291 (c->dcache.flags & MIPS_CACHE_ALIASES) ? 1292 "cache aliases" : "no aliases", 1293 c->dcache.linesz); 1294 } 1295 1296 /* 1297 * If you even _breathe_ on this function, look at the gcc output and make sure 1298 * it does not pop things on and off the stack for the cache sizing loop that 1299 * executes in KSEG1 space or else you will crash and burn badly. You have 1300 * been warned. 1301 */ 1302 static int probe_scache(void) 1303 { 1304 unsigned long flags, addr, begin, end, pow2; 1305 unsigned int config = read_c0_config(); 1306 struct cpuinfo_mips *c = ¤t_cpu_data; 1307 1308 if (config & CONF_SC) 1309 return 0; 1310 1311 begin = (unsigned long) &_stext; 1312 begin &= ~((4 * 1024 * 1024) - 1); 1313 end = begin + (4 * 1024 * 1024); 1314 1315 /* 1316 * This is such a bitch, you'd think they would make it easy to do 1317 * this. Away you daemons of stupidity! 1318 */ 1319 local_irq_save(flags); 1320 1321 /* Fill each size-multiple cache line with a valid tag. */ 1322 pow2 = (64 * 1024); 1323 for (addr = begin; addr < end; addr = (begin + pow2)) { 1324 unsigned long *p = (unsigned long *) addr; 1325 __asm__ __volatile__("nop" : : "r" (*p)); /* whee... */ 1326 pow2 <<= 1; 1327 } 1328 1329 /* Load first line with zero (therefore invalid) tag. */ 1330 write_c0_taglo(0); 1331 write_c0_taghi(0); 1332 __asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */ 1333 cache_op(Index_Store_Tag_I, begin); 1334 cache_op(Index_Store_Tag_D, begin); 1335 cache_op(Index_Store_Tag_SD, begin); 1336 1337 /* Now search for the wrap around point. */ 1338 pow2 = (128 * 1024); 1339 for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) { 1340 cache_op(Index_Load_Tag_SD, addr); 1341 __asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */ 1342 if (!read_c0_taglo()) 1343 break; 1344 pow2 <<= 1; 1345 } 1346 local_irq_restore(flags); 1347 addr -= begin; 1348 1349 scache_size = addr; 1350 c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22); 1351 c->scache.ways = 1; 1352 c->dcache.waybit = 0; /* does not matter */ 1353 1354 return 1; 1355 } 1356 1357 static void __init loongson2_sc_init(void) 1358 { 1359 struct cpuinfo_mips *c = ¤t_cpu_data; 1360 1361 scache_size = 512*1024; 1362 c->scache.linesz = 32; 1363 c->scache.ways = 4; 1364 c->scache.waybit = 0; 1365 c->scache.waysize = scache_size / (c->scache.ways); 1366 c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways); 1367 pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n", 1368 scache_size >> 10, way_string[c->scache.ways], c->scache.linesz); 1369 1370 c->options |= MIPS_CPU_INCLUSIVE_CACHES; 1371 } 1372 1373 static void __init loongson3_sc_init(void) 1374 { 1375 struct cpuinfo_mips *c = ¤t_cpu_data; 1376 unsigned int config2, lsize; 1377 1378 config2 = read_c0_config2(); 1379 lsize = (config2 >> 4) & 15; 1380 if (lsize) 1381 c->scache.linesz = 2 << lsize; 1382 else 1383 c->scache.linesz = 0; 1384 c->scache.sets = 64 << ((config2 >> 8) & 15); 1385 c->scache.ways = 1 + (config2 & 15); 1386 1387 scache_size = c->scache.sets * 1388 c->scache.ways * 1389 c->scache.linesz; 1390 /* Loongson-3 has 4 cores, 1MB scache for each. scaches are shared */ 1391 scache_size *= 4; 1392 c->scache.waybit = 0; 1393 pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n", 1394 scache_size >> 10, way_string[c->scache.ways], c->scache.linesz); 1395 if (scache_size) 1396 c->options |= MIPS_CPU_INCLUSIVE_CACHES; 1397 return; 1398 } 1399 1400 extern int r5k_sc_init(void); 1401 extern int rm7k_sc_init(void); 1402 extern int mips_sc_init(void); 1403 1404 static void setup_scache(void) 1405 { 1406 struct cpuinfo_mips *c = ¤t_cpu_data; 1407 unsigned int config = read_c0_config(); 1408 int sc_present = 0; 1409 1410 /* 1411 * Do the probing thing on R4000SC and R4400SC processors. Other 1412 * processors don't have a S-cache that would be relevant to the 1413 * Linux memory management. 1414 */ 1415 switch (current_cpu_type()) { 1416 case CPU_R4000SC: 1417 case CPU_R4000MC: 1418 case CPU_R4400SC: 1419 case CPU_R4400MC: 1420 sc_present = run_uncached(probe_scache); 1421 if (sc_present) 1422 c->options |= MIPS_CPU_CACHE_CDEX_S; 1423 break; 1424 1425 case CPU_R10000: 1426 case CPU_R12000: 1427 case CPU_R14000: 1428 scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16); 1429 c->scache.linesz = 64 << ((config >> 13) & 1); 1430 c->scache.ways = 2; 1431 c->scache.waybit= 0; 1432 sc_present = 1; 1433 break; 1434 1435 case CPU_R5000: 1436 case CPU_NEVADA: 1437 #ifdef CONFIG_R5000_CPU_SCACHE 1438 r5k_sc_init(); 1439 #endif 1440 return; 1441 1442 case CPU_RM7000: 1443 #ifdef CONFIG_RM7000_CPU_SCACHE 1444 rm7k_sc_init(); 1445 #endif 1446 return; 1447 1448 case CPU_LOONGSON2: 1449 loongson2_sc_init(); 1450 return; 1451 1452 case CPU_LOONGSON3: 1453 loongson3_sc_init(); 1454 return; 1455 1456 case CPU_CAVIUM_OCTEON3: 1457 case CPU_XLP: 1458 /* don't need to worry about L2, fully coherent */ 1459 return; 1460 1461 default: 1462 if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M32R2 | 1463 MIPS_CPU_ISA_M64R1 | MIPS_CPU_ISA_M64R2)) { 1464 #ifdef CONFIG_MIPS_CPU_SCACHE 1465 if (mips_sc_init ()) { 1466 scache_size = c->scache.ways * c->scache.sets * c->scache.linesz; 1467 printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n", 1468 scache_size >> 10, 1469 way_string[c->scache.ways], c->scache.linesz); 1470 } 1471 #else 1472 if (!(c->scache.flags & MIPS_CACHE_NOT_PRESENT)) 1473 panic("Dunno how to handle MIPS32 / MIPS64 second level cache"); 1474 #endif 1475 return; 1476 } 1477 sc_present = 0; 1478 } 1479 1480 if (!sc_present) 1481 return; 1482 1483 /* compute a couple of other cache variables */ 1484 c->scache.waysize = scache_size / c->scache.ways; 1485 1486 c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways); 1487 1488 printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n", 1489 scache_size >> 10, way_string[c->scache.ways], c->scache.linesz); 1490 1491 c->options |= MIPS_CPU_INCLUSIVE_CACHES; 1492 } 1493 1494 void au1x00_fixup_config_od(void) 1495 { 1496 /* 1497 * c0_config.od (bit 19) was write only (and read as 0) 1498 * on the early revisions of Alchemy SOCs. It disables the bus 1499 * transaction overlapping and needs to be set to fix various errata. 1500 */ 1501 switch (read_c0_prid()) { 1502 case 0x00030100: /* Au1000 DA */ 1503 case 0x00030201: /* Au1000 HA */ 1504 case 0x00030202: /* Au1000 HB */ 1505 case 0x01030200: /* Au1500 AB */ 1506 /* 1507 * Au1100 errata actually keeps silence about this bit, so we set it 1508 * just in case for those revisions that require it to be set according 1509 * to the (now gone) cpu table. 1510 */ 1511 case 0x02030200: /* Au1100 AB */ 1512 case 0x02030201: /* Au1100 BA */ 1513 case 0x02030202: /* Au1100 BC */ 1514 set_c0_config(1 << 19); 1515 break; 1516 } 1517 } 1518 1519 /* CP0 hazard avoidance. */ 1520 #define NXP_BARRIER() \ 1521 __asm__ __volatile__( \ 1522 ".set noreorder\n\t" \ 1523 "nop; nop; nop; nop; nop; nop;\n\t" \ 1524 ".set reorder\n\t") 1525 1526 static void nxp_pr4450_fixup_config(void) 1527 { 1528 unsigned long config0; 1529 1530 config0 = read_c0_config(); 1531 1532 /* clear all three cache coherency fields */ 1533 config0 &= ~(0x7 | (7 << 25) | (7 << 28)); 1534 config0 |= (((_page_cachable_default >> _CACHE_SHIFT) << 0) | 1535 ((_page_cachable_default >> _CACHE_SHIFT) << 25) | 1536 ((_page_cachable_default >> _CACHE_SHIFT) << 28)); 1537 write_c0_config(config0); 1538 NXP_BARRIER(); 1539 } 1540 1541 static int cca = -1; 1542 1543 static int __init cca_setup(char *str) 1544 { 1545 get_option(&str, &cca); 1546 1547 return 0; 1548 } 1549 1550 early_param("cca", cca_setup); 1551 1552 static void coherency_setup(void) 1553 { 1554 if (cca < 0 || cca > 7) 1555 cca = read_c0_config() & CONF_CM_CMASK; 1556 _page_cachable_default = cca << _CACHE_SHIFT; 1557 1558 pr_debug("Using cache attribute %d\n", cca); 1559 change_c0_config(CONF_CM_CMASK, cca); 1560 1561 /* 1562 * c0_status.cu=0 specifies that updates by the sc instruction use 1563 * the coherency mode specified by the TLB; 1 means cachable 1564 * coherent update on write will be used. Not all processors have 1565 * this bit and; some wire it to zero, others like Toshiba had the 1566 * silly idea of putting something else there ... 1567 */ 1568 switch (current_cpu_type()) { 1569 case CPU_R4000PC: 1570 case CPU_R4000SC: 1571 case CPU_R4000MC: 1572 case CPU_R4400PC: 1573 case CPU_R4400SC: 1574 case CPU_R4400MC: 1575 clear_c0_config(CONF_CU); 1576 break; 1577 /* 1578 * We need to catch the early Alchemy SOCs with 1579 * the write-only co_config.od bit and set it back to one on: 1580 * Au1000 rev DA, HA, HB; Au1100 AB, BA, BC, Au1500 AB 1581 */ 1582 case CPU_ALCHEMY: 1583 au1x00_fixup_config_od(); 1584 break; 1585 1586 case PRID_IMP_PR4450: 1587 nxp_pr4450_fixup_config(); 1588 break; 1589 } 1590 } 1591 1592 static void r4k_cache_error_setup(void) 1593 { 1594 extern char __weak except_vec2_generic; 1595 extern char __weak except_vec2_sb1; 1596 1597 switch (current_cpu_type()) { 1598 case CPU_SB1: 1599 case CPU_SB1A: 1600 set_uncached_handler(0x100, &except_vec2_sb1, 0x80); 1601 break; 1602 1603 default: 1604 set_uncached_handler(0x100, &except_vec2_generic, 0x80); 1605 break; 1606 } 1607 } 1608 1609 void r4k_cache_init(void) 1610 { 1611 extern void build_clear_page(void); 1612 extern void build_copy_page(void); 1613 struct cpuinfo_mips *c = ¤t_cpu_data; 1614 1615 probe_pcache(); 1616 setup_scache(); 1617 1618 r4k_blast_dcache_page_setup(); 1619 r4k_blast_dcache_page_indexed_setup(); 1620 r4k_blast_dcache_setup(); 1621 r4k_blast_icache_page_setup(); 1622 r4k_blast_icache_page_indexed_setup(); 1623 r4k_blast_icache_setup(); 1624 r4k_blast_scache_page_setup(); 1625 r4k_blast_scache_page_indexed_setup(); 1626 r4k_blast_scache_setup(); 1627 #ifdef CONFIG_EVA 1628 r4k_blast_dcache_user_page_setup(); 1629 r4k_blast_icache_user_page_setup(); 1630 #endif 1631 1632 /* 1633 * Some MIPS32 and MIPS64 processors have physically indexed caches. 1634 * This code supports virtually indexed processors and will be 1635 * unnecessarily inefficient on physically indexed processors. 1636 */ 1637 if (c->dcache.linesz) 1638 shm_align_mask = max_t( unsigned long, 1639 c->dcache.sets * c->dcache.linesz - 1, 1640 PAGE_SIZE - 1); 1641 else 1642 shm_align_mask = PAGE_SIZE-1; 1643 1644 __flush_cache_vmap = r4k__flush_cache_vmap; 1645 __flush_cache_vunmap = r4k__flush_cache_vunmap; 1646 1647 flush_cache_all = cache_noop; 1648 __flush_cache_all = r4k___flush_cache_all; 1649 flush_cache_mm = r4k_flush_cache_mm; 1650 flush_cache_page = r4k_flush_cache_page; 1651 flush_cache_range = r4k_flush_cache_range; 1652 1653 __flush_kernel_vmap_range = r4k_flush_kernel_vmap_range; 1654 1655 flush_cache_sigtramp = r4k_flush_cache_sigtramp; 1656 flush_icache_all = r4k_flush_icache_all; 1657 local_flush_data_cache_page = local_r4k_flush_data_cache_page; 1658 flush_data_cache_page = r4k_flush_data_cache_page; 1659 flush_icache_range = r4k_flush_icache_range; 1660 local_flush_icache_range = local_r4k_flush_icache_range; 1661 1662 #if defined(CONFIG_DMA_NONCOHERENT) || defined(CONFIG_DMA_MAYBE_COHERENT) 1663 if (coherentio) { 1664 _dma_cache_wback_inv = (void *)cache_noop; 1665 _dma_cache_wback = (void *)cache_noop; 1666 _dma_cache_inv = (void *)cache_noop; 1667 } else { 1668 _dma_cache_wback_inv = r4k_dma_cache_wback_inv; 1669 _dma_cache_wback = r4k_dma_cache_wback_inv; 1670 _dma_cache_inv = r4k_dma_cache_inv; 1671 } 1672 #endif 1673 1674 build_clear_page(); 1675 build_copy_page(); 1676 1677 /* 1678 * We want to run CMP kernels on core with and without coherent 1679 * caches. Therefore, do not use CONFIG_MIPS_CMP to decide whether 1680 * or not to flush caches. 1681 */ 1682 local_r4k___flush_cache_all(NULL); 1683 1684 coherency_setup(); 1685 board_cache_error_setup = r4k_cache_error_setup; 1686 } 1687 1688 static int r4k_cache_pm_notifier(struct notifier_block *self, unsigned long cmd, 1689 void *v) 1690 { 1691 switch (cmd) { 1692 case CPU_PM_ENTER_FAILED: 1693 case CPU_PM_EXIT: 1694 coherency_setup(); 1695 break; 1696 } 1697 1698 return NOTIFY_OK; 1699 } 1700 1701 static struct notifier_block r4k_cache_pm_notifier_block = { 1702 .notifier_call = r4k_cache_pm_notifier, 1703 }; 1704 1705 int __init r4k_cache_init_pm(void) 1706 { 1707 return cpu_pm_register_notifier(&r4k_cache_pm_notifier_block); 1708 } 1709 arch_initcall(r4k_cache_init_pm); 1710