arch/mips/mm/c-r4k.c

   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/hardirq.h>
  11 #include <linux/init.h>
  12 #include <linux/highmem.h>
  13 #include <linux/kernel.h>
  14 #include <linux/linkage.h>
  15 #include <linux/sched.h>
  16 #include <linux/smp.h>
  17 #include <linux/mm.h>
  18 #include <linux/module.h>
  19 #include <linux/bitops.h>
  20
  21 #include <asm/bcache.h>
  22 #include <asm/bootinfo.h>
  23 #include <asm/cache.h>
  24 #include <asm/cacheops.h>
  25 #include <asm/cpu.h>
  26 #include <asm/cpu-features.h>
  27 #include <asm/io.h>
  28 #include <asm/page.h>
  29 #include <asm/pgtable.h>
  30 #include <asm/r4kcache.h>
  31 #include <asm/sections.h>
  32 #include <asm/mmu_context.h>
  33 #include <asm/war.h>
  34 #include <asm/cacheflush.h> /* for run_uncached() */
  35 #include <asm/traps.h>
  36
  37 /*
  38  * Special Variant of smp_call_function for use by cache functions:
  39  *
  40  *  o No return value
  41  *  o collapses to normal function call on UP kernels
  42  *  o collapses to normal function call on systems with a single shared
  43  *    primary cache.
  44  *  o doesn't disable interrupts on the local CPU
  45  */
  46 static inline void r4k_on_each_cpu(void (*func) (void *info), void *info)
  47 {
  48         preempt_disable();
  49
  50 #if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC)
  51         smp_call_function(func, info, 1);
  52 #endif
  53         func(info);
  54         preempt_enable();
  55 }
  56
  57 #if defined(CONFIG_MIPS_CMP)
  58 #define cpu_has_safe_index_cacheops 0
  59 #else
  60 #define cpu_has_safe_index_cacheops 1
  61 #endif
  62
  63 /*
  64  * Must die.
  65  */
  66 static unsigned long icache_size __read_mostly;
  67 static unsigned long dcache_size __read_mostly;
  68 static unsigned long scache_size __read_mostly;
  69
  70 /*
  71  * Dummy cache handling routines for machines without boardcaches
  72  */
  73 static void cache_noop(void) {}
  74
  75 static struct bcache_ops no_sc_ops = {
  76         .bc_enable = (void *)cache_noop,
  77         .bc_disable = (void *)cache_noop,
  78         .bc_wback_inv = (void *)cache_noop,
  79         .bc_inv = (void *)cache_noop
  80 };
  81
  82 struct bcache_ops *bcops = &no_sc_ops;
  83
  84 #define cpu_is_r4600_v1_x()     ((read_c0_prid() & 0xfffffff0) == 0x00002010)
  85 #define cpu_is_r4600_v2_x()     ((read_c0_prid() & 0xfffffff0) == 0x00002020)
  86
  87 #define R4600_HIT_CACHEOP_WAR_IMPL                                      \
  88 do {                                                                    \
  89         if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x())            \
  90                 *(volatile unsigned long *)CKSEG1;                      \
  91         if (R4600_V1_HIT_CACHEOP_WAR)                                   \
  92                 __asm__ __volatile__("nop;nop;nop;nop");                \
  93 } while (0)
  94
  95 static void (*r4k_blast_dcache_page)(unsigned long addr);
  96
  97 static inline void r4k_blast_dcache_page_dc32(unsigned long addr)
  98 {
  99         R4600_HIT_CACHEOP_WAR_IMPL;
 100         blast_dcache32_page(addr);
 101 }
 102
 103 static inline void r4k_blast_dcache_page_dc64(unsigned long addr)
 104 {
 105         R4600_HIT_CACHEOP_WAR_IMPL;
 106         blast_dcache64_page(addr);
 107 }
 108
 109 static void __cpuinit r4k_blast_dcache_page_setup(void)
 110 {
 111         unsigned long  dc_lsize = cpu_dcache_line_size();
 112
 113         if (dc_lsize == 0)
 114                 r4k_blast_dcache_page = (void *)cache_noop;
 115         else if (dc_lsize == 16)
 116                 r4k_blast_dcache_page = blast_dcache16_page;
 117         else if (dc_lsize == 32)
 118                 r4k_blast_dcache_page = r4k_blast_dcache_page_dc32;
 119         else if (dc_lsize == 64)
 120                 r4k_blast_dcache_page = r4k_blast_dcache_page_dc64;
 121 }
 122
 123 static void (* r4k_blast_dcache_page_indexed)(unsigned long addr);
 124
 125 static void __cpuinit r4k_blast_dcache_page_indexed_setup(void)
 126 {
 127         unsigned long dc_lsize = cpu_dcache_line_size();
 128
 129         if (dc_lsize == 0)
 130                 r4k_blast_dcache_page_indexed = (void *)cache_noop;
 131         else if (dc_lsize == 16)
 132                 r4k_blast_dcache_page_indexed = blast_dcache16_page_indexed;
 133         else if (dc_lsize == 32)
 134                 r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed;
 135         else if (dc_lsize == 64)
 136                 r4k_blast_dcache_page_indexed = blast_dcache64_page_indexed;
 137 }
 138
 139 static void (* r4k_blast_dcache)(void);
 140
 141 static void __cpuinit r4k_blast_dcache_setup(void)
 142 {
 143         unsigned long dc_lsize = cpu_dcache_line_size();
 144
 145         if (dc_lsize == 0)
 146                 r4k_blast_dcache = (void *)cache_noop;
 147         else if (dc_lsize == 16)
 148                 r4k_blast_dcache = blast_dcache16;
 149         else if (dc_lsize == 32)
 150                 r4k_blast_dcache = blast_dcache32;
 151         else if (dc_lsize == 64)
 152                 r4k_blast_dcache = blast_dcache64;
 153 }
 154
 155 /* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
 156 #define JUMP_TO_ALIGN(order) \
 157         __asm__ __volatile__( \
 158                 "b\t1f\n\t" \
 159                 ".align\t" #order "\n\t" \
 160                 "1:\n\t" \
 161                 )
 162 #define CACHE32_UNROLL32_ALIGN  JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
 163 #define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
 164
 165 static inline void blast_r4600_v1_icache32(void)
 166 {
 167         unsigned long flags;
 168
 169         local_irq_save(flags);
 170         blast_icache32();
 171         local_irq_restore(flags);
 172 }
 173
 174 static inline void tx49_blast_icache32(void)
 175 {
 176         unsigned long start = INDEX_BASE;
 177         unsigned long end = start + current_cpu_data.icache.waysize;
 178         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 179         unsigned long ws_end = current_cpu_data.icache.ways <<
 180                                current_cpu_data.icache.waybit;
 181         unsigned long ws, addr;
 182
 183         CACHE32_UNROLL32_ALIGN2;
 184         /* I'm in even chunk.  blast odd chunks */
 185         for (ws = 0; ws < ws_end; ws += ws_inc)
 186                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 187                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 188         CACHE32_UNROLL32_ALIGN;
 189         /* I'm in odd chunk.  blast even chunks */
 190         for (ws = 0; ws < ws_end; ws += ws_inc)
 191                 for (addr = start; addr < end; addr += 0x400 * 2)
 192                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 193 }
 194
 195 static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page)
 196 {
 197         unsigned long flags;
 198
 199         local_irq_save(flags);
 200         blast_icache32_page_indexed(page);
 201         local_irq_restore(flags);
 202 }
 203
 204 static inline void tx49_blast_icache32_page_indexed(unsigned long page)
 205 {
 206         unsigned long indexmask = current_cpu_data.icache.waysize - 1;
 207         unsigned long start = INDEX_BASE + (page & indexmask);
 208         unsigned long end = start + PAGE_SIZE;
 209         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 210         unsigned long ws_end = current_cpu_data.icache.ways <<
 211                                current_cpu_data.icache.waybit;
 212         unsigned long ws, addr;
 213
 214         CACHE32_UNROLL32_ALIGN2;
 215         /* I'm in even chunk.  blast odd chunks */
 216         for (ws = 0; ws < ws_end; ws += ws_inc)
 217                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 218                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 219         CACHE32_UNROLL32_ALIGN;
 220         /* I'm in odd chunk.  blast even chunks */
 221         for (ws = 0; ws < ws_end; ws += ws_inc)
 222                 for (addr = start; addr < end; addr += 0x400 * 2)
 223                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 224 }
 225
 226 static void (* r4k_blast_icache_page)(unsigned long addr);
 227
 228 static void __cpuinit r4k_blast_icache_page_setup(void)
 229 {
 230         unsigned long ic_lsize = cpu_icache_line_size();
 231
 232         if (ic_lsize == 0)
 233                 r4k_blast_icache_page = (void *)cache_noop;
 234         else if (ic_lsize == 16)
 235                 r4k_blast_icache_page = blast_icache16_page;
 236         else if (ic_lsize == 32)
 237                 r4k_blast_icache_page = blast_icache32_page;
 238         else if (ic_lsize == 64)
 239                 r4k_blast_icache_page = blast_icache64_page;
 240 }
 241
 242
 243 static void (* r4k_blast_icache_page_indexed)(unsigned long addr);
 244
 245 static void __cpuinit r4k_blast_icache_page_indexed_setup(void)
 246 {
 247         unsigned long ic_lsize = cpu_icache_line_size();
 248
 249         if (ic_lsize == 0)
 250                 r4k_blast_icache_page_indexed = (void *)cache_noop;
 251         else if (ic_lsize == 16)
 252                 r4k_blast_icache_page_indexed = blast_icache16_page_indexed;
 253         else if (ic_lsize == 32) {
 254                 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
 255                         r4k_blast_icache_page_indexed =
 256                                 blast_icache32_r4600_v1_page_indexed;
 257                 else if (TX49XX_ICACHE_INDEX_INV_WAR)
 258                         r4k_blast_icache_page_indexed =
 259                                 tx49_blast_icache32_page_indexed;
 260                 else
 261                         r4k_blast_icache_page_indexed =
 262                                 blast_icache32_page_indexed;
 263         } else if (ic_lsize == 64)
 264                 r4k_blast_icache_page_indexed = blast_icache64_page_indexed;
 265 }
 266
 267 static void (* r4k_blast_icache)(void);
 268
 269 static void __cpuinit r4k_blast_icache_setup(void)
 270 {
 271         unsigned long ic_lsize = cpu_icache_line_size();
 272
 273         if (ic_lsize == 0)
 274                 r4k_blast_icache = (void *)cache_noop;
 275         else if (ic_lsize == 16)
 276                 r4k_blast_icache = blast_icache16;
 277         else if (ic_lsize == 32) {
 278                 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
 279                         r4k_blast_icache = blast_r4600_v1_icache32;
 280                 else if (TX49XX_ICACHE_INDEX_INV_WAR)
 281                         r4k_blast_icache = tx49_blast_icache32;
 282                 else
 283                         r4k_blast_icache = blast_icache32;
 284         } else if (ic_lsize == 64)
 285                 r4k_blast_icache = blast_icache64;
 286 }
 287
 288 static void (* r4k_blast_scache_page)(unsigned long addr);
 289
 290 static void __cpuinit r4k_blast_scache_page_setup(void)
 291 {
 292         unsigned long sc_lsize = cpu_scache_line_size();
 293
 294         if (scache_size == 0)
 295                 r4k_blast_scache_page = (void *)cache_noop;
 296         else if (sc_lsize == 16)
 297                 r4k_blast_scache_page = blast_scache16_page;
 298         else if (sc_lsize == 32)
 299                 r4k_blast_scache_page = blast_scache32_page;
 300         else if (sc_lsize == 64)
 301                 r4k_blast_scache_page = blast_scache64_page;
 302         else if (sc_lsize == 128)
 303                 r4k_blast_scache_page = blast_scache128_page;
 304 }
 305
 306 static void (* r4k_blast_scache_page_indexed)(unsigned long addr);
 307
 308 static void __cpuinit r4k_blast_scache_page_indexed_setup(void)
 309 {
 310         unsigned long sc_lsize = cpu_scache_line_size();
 311
 312         if (scache_size == 0)
 313                 r4k_blast_scache_page_indexed = (void *)cache_noop;
 314         else if (sc_lsize == 16)
 315                 r4k_blast_scache_page_indexed = blast_scache16_page_indexed;
 316         else if (sc_lsize == 32)
 317                 r4k_blast_scache_page_indexed = blast_scache32_page_indexed;
 318         else if (sc_lsize == 64)
 319                 r4k_blast_scache_page_indexed = blast_scache64_page_indexed;
 320         else if (sc_lsize == 128)
 321                 r4k_blast_scache_page_indexed = blast_scache128_page_indexed;
 322 }
 323
 324 static void (* r4k_blast_scache)(void);
 325
 326 static void __cpuinit r4k_blast_scache_setup(void)
 327 {
 328         unsigned long sc_lsize = cpu_scache_line_size();
 329
 330         if (scache_size == 0)
 331                 r4k_blast_scache = (void *)cache_noop;
 332         else if (sc_lsize == 16)
 333                 r4k_blast_scache = blast_scache16;
 334         else if (sc_lsize == 32)
 335                 r4k_blast_scache = blast_scache32;
 336         else if (sc_lsize == 64)
 337                 r4k_blast_scache = blast_scache64;
 338         else if (sc_lsize == 128)
 339                 r4k_blast_scache = blast_scache128;
 340 }
 341
 342 static inline void local_r4k___flush_cache_all(void * args)
 343 {
 344 #if defined(CONFIG_CPU_LOONGSON2)
 345         r4k_blast_scache();
 346         return;
 347 #endif
 348         r4k_blast_dcache();
 349         r4k_blast_icache();
 350
 351         switch (current_cpu_type()) {
 352         case CPU_R4000SC:
 353         case CPU_R4000MC:
 354         case CPU_R4400SC:
 355         case CPU_R4400MC:
 356         case CPU_R10000:
 357         case CPU_R12000:
 358         case CPU_R14000:
 359                 r4k_blast_scache();
 360         }
 361 }
 362
 363 static void r4k___flush_cache_all(void)
 364 {
 365         r4k_on_each_cpu(local_r4k___flush_cache_all, NULL);
 366 }
 367
 368 static inline int has_valid_asid(const struct mm_struct *mm)
 369 {
 370 #if defined(CONFIG_MIPS_MT_SMP) || defined(CONFIG_MIPS_MT_SMTC)
 371         int i;
 372
 373         for_each_online_cpu(i)
 374                 if (cpu_context(i, mm))
 375                         return 1;
 376
 377         return 0;
 378 #else
 379         return cpu_context(smp_processor_id(), mm);
 380 #endif
 381 }
 382
 383 static void r4k__flush_cache_vmap(void)
 384 {
 385         r4k_blast_dcache();
 386 }
 387
 388 static void r4k__flush_cache_vunmap(void)
 389 {
 390         r4k_blast_dcache();
 391 }
 392
 393 static inline void local_r4k_flush_cache_range(void * args)
 394 {
 395         struct vm_area_struct *vma = args;
 396         int exec = vma->vm_flags & VM_EXEC;
 397
 398         if (!(has_valid_asid(vma->vm_mm)))
 399                 return;
 400
 401         r4k_blast_dcache();
 402         if (exec)
 403                 r4k_blast_icache();
 404 }
 405
 406 static void r4k_flush_cache_range(struct vm_area_struct *vma,
 407         unsigned long start, unsigned long end)
 408 {
 409         int exec = vma->vm_flags & VM_EXEC;
 410
 411         if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc))
 412                 r4k_on_each_cpu(local_r4k_flush_cache_range, vma);
 413 }
 414
 415 static inline void local_r4k_flush_cache_mm(void * args)
 416 {
 417         struct mm_struct *mm = args;
 418
 419         if (!has_valid_asid(mm))
 420                 return;
 421
 422         /*
 423          * Kludge alert.  For obscure reasons R4000SC and R4400SC go nuts if we
 424          * only flush the primary caches but R10000 and R12000 behave sane ...
 425          * R4000SC and R4400SC indexed S-cache ops also invalidate primary
 426          * caches, so we can bail out early.
 427          */
 428         if (current_cpu_type() == CPU_R4000SC ||
 429             current_cpu_type() == CPU_R4000MC ||
 430             current_cpu_type() == CPU_R4400SC ||
 431             current_cpu_type() == CPU_R4400MC) {
 432                 r4k_blast_scache();
 433                 return;
 434         }
 435
 436         r4k_blast_dcache();
 437 }
 438
 439 static void r4k_flush_cache_mm(struct mm_struct *mm)
 440 {
 441         if (!cpu_has_dc_aliases)
 442                 return;
 443
 444         r4k_on_each_cpu(local_r4k_flush_cache_mm, mm);
 445 }
 446
 447 struct flush_cache_page_args {
 448         struct vm_area_struct *vma;
 449         unsigned long addr;
 450         unsigned long pfn;
 451 };
 452
 453 static inline void local_r4k_flush_cache_page(void *args)
 454 {
 455         struct flush_cache_page_args *fcp_args = args;
 456         struct vm_area_struct *vma = fcp_args->vma;
 457         unsigned long addr = fcp_args->addr;
 458         struct page *page = pfn_to_page(fcp_args->pfn);
 459         int exec = vma->vm_flags & VM_EXEC;
 460         struct mm_struct *mm = vma->vm_mm;
 461         int map_coherent = 0;
 462         pgd_t *pgdp;
 463         pud_t *pudp;
 464         pmd_t *pmdp;
 465         pte_t *ptep;
 466         void *vaddr;
 467
 468         /*
 469          * If ownes no valid ASID yet, cannot possibly have gotten
 470          * this page into the cache.
 471          */
 472         if (!has_valid_asid(mm))
 473                 return;
 474
 475         addr &= PAGE_MASK;
 476         pgdp = pgd_offset(mm, addr);
 477         pudp = pud_offset(pgdp, addr);
 478         pmdp = pmd_offset(pudp, addr);
 479         ptep = pte_offset(pmdp, addr);
 480
 481         /*
 482          * If the page isn't marked valid, the page cannot possibly be
 483          * in the cache.
 484          */
 485         if (!(pte_present(*ptep)))
 486                 return;
 487
 488         if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID))
 489                 vaddr = NULL;
 490         else {
 491                 /*
 492                  * Use kmap_coherent or kmap_atomic to do flushes for
 493                  * another ASID than the current one.
 494                  */
 495                 map_coherent = (cpu_has_dc_aliases &&
 496                                 page_mapped(page) && !Page_dcache_dirty(page));
 497                 if (map_coherent)
 498                         vaddr = kmap_coherent(page, addr);
 499                 else
 500                         vaddr = kmap_atomic(page);
 501                 addr = (unsigned long)vaddr;
 502         }
 503
 504         if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
 505                 r4k_blast_dcache_page(addr);
 506                 if (exec && !cpu_icache_snoops_remote_store)
 507                         r4k_blast_scache_page(addr);
 508         }
 509         if (exec) {
 510                 if (vaddr && cpu_has_vtag_icache && mm == current->active_mm) {
 511                         int cpu = smp_processor_id();
 512
 513                         if (cpu_context(cpu, mm) != 0)
 514                                 drop_mmu_context(mm, cpu);
 515                 } else
 516                         r4k_blast_icache_page(addr);
 517         }
 518
 519         if (vaddr) {
 520                 if (map_coherent)
 521                         kunmap_coherent();
 522                 else
 523                         kunmap_atomic(vaddr);
 524         }
 525 }
 526
 527 static void r4k_flush_cache_page(struct vm_area_struct *vma,
 528         unsigned long addr, unsigned long pfn)
 529 {
 530         struct flush_cache_page_args args;
 531
 532         args.vma = vma;
 533         args.addr = addr;
 534         args.pfn = pfn;
 535
 536         r4k_on_each_cpu(local_r4k_flush_cache_page, &args);
 537 }
 538
 539 static inline void local_r4k_flush_data_cache_page(void * addr)
 540 {
 541         r4k_blast_dcache_page((unsigned long) addr);
 542 }
 543
 544 static void r4k_flush_data_cache_page(unsigned long addr)
 545 {
 546         if (in_atomic())
 547                 local_r4k_flush_data_cache_page((void *)addr);
 548         else
 549                 r4k_on_each_cpu(local_r4k_flush_data_cache_page, (void *) addr);
 550 }
 551
 552 struct flush_icache_range_args {
 553         unsigned long start;
 554         unsigned long end;
 555 };
 556
 557 static inline void local_r4k_flush_icache_range(unsigned long start, unsigned long end)
 558 {
 559         if (!cpu_has_ic_fills_f_dc) {
 560                 if (end - start >= dcache_size) {
 561                         r4k_blast_dcache();
 562                 } else {
 563                         R4600_HIT_CACHEOP_WAR_IMPL;
 564                         protected_blast_dcache_range(start, end);
 565                 }
 566         }
 567
 568         if (end - start > icache_size)
 569                 r4k_blast_icache();
 570         else
 571                 protected_blast_icache_range(start, end);
 572 }
 573
 574 static inline void local_r4k_flush_icache_range_ipi(void *args)
 575 {
 576         struct flush_icache_range_args *fir_args = args;
 577         unsigned long start = fir_args->start;
 578         unsigned long end = fir_args->end;
 579
 580         local_r4k_flush_icache_range(start, end);
 581 }
 582
 583 static void r4k_flush_icache_range(unsigned long start, unsigned long end)
 584 {
 585         struct flush_icache_range_args args;
 586
 587         args.start = start;
 588         args.end = end;
 589
 590         r4k_on_each_cpu(local_r4k_flush_icache_range_ipi, &args);
 591         instruction_hazard();
 592 }
 593
 594 #ifdef CONFIG_DMA_NONCOHERENT
 595
 596 static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
 597 {
 598         /* Catch bad driver code */
 599         BUG_ON(size == 0);
 600
 601         if (cpu_has_inclusive_pcaches) {
 602                 if (size >= scache_size)
 603                         r4k_blast_scache();
 604                 else
 605                         blast_scache_range(addr, addr + size);
 606                 __sync();
 607                 return;
 608         }
 609
 610         /*
 611          * Either no secondary cache or the available caches don't have the
 612          * subset property so we have to flush the primary caches
 613          * explicitly
 614          */
 615         if (cpu_has_safe_index_cacheops && size >= dcache_size) {
 616                 r4k_blast_dcache();
 617         } else {
 618                 R4600_HIT_CACHEOP_WAR_IMPL;
 619                 blast_dcache_range(addr, addr + size);
 620         }
 621
 622         bc_wback_inv(addr, size);
 623         __sync();
 624 }
 625
 626 static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
 627 {
 628         /* Catch bad driver code */
 629         BUG_ON(size == 0);
 630
 631         if (cpu_has_inclusive_pcaches) {
 632                 if (size >= scache_size)
 633                         r4k_blast_scache();
 634                 else {
 635                         /*
 636                          * There is no clearly documented alignment requirement
 637                          * for the cache instruction on MIPS processors and
 638                          * some processors, among them the RM5200 and RM7000
 639                          * QED processors will throw an address error for cache
 640                          * hit ops with insufficient alignment.  Solved by
 641                          * aligning the address to cache line size.
 642                          */
 643                         blast_inv_scache_range(addr, addr + size);
 644                 }
 645                 __sync();
 646                 return;
 647         }
 648
 649         if (cpu_has_safe_index_cacheops && size >= dcache_size) {
 650                 r4k_blast_dcache();
 651         } else {
 652                 R4600_HIT_CACHEOP_WAR_IMPL;
 653                 blast_inv_dcache_range(addr, addr + size);
 654         }
 655
 656         bc_inv(addr, size);
 657         __sync();
 658 }
 659 #endif /* CONFIG_DMA_NONCOHERENT */
 660
 661 /*
 662  * While we're protected against bad userland addresses we don't care
 663  * very much about what happens in that case.  Usually a segmentation
 664  * fault will dump the process later on anyway ...
 665  */
 666 static void local_r4k_flush_cache_sigtramp(void * arg)
 667 {
 668         unsigned long ic_lsize = cpu_icache_line_size();
 669         unsigned long dc_lsize = cpu_dcache_line_size();
 670         unsigned long sc_lsize = cpu_scache_line_size();
 671         unsigned long addr = (unsigned long) arg;
 672
 673         R4600_HIT_CACHEOP_WAR_IMPL;
 674         if (dc_lsize)
 675                 protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
 676         if (!cpu_icache_snoops_remote_store && scache_size)
 677                 protected_writeback_scache_line(addr & ~(sc_lsize - 1));
 678         if (ic_lsize)
 679                 protected_flush_icache_line(addr & ~(ic_lsize - 1));
 680         if (MIPS4K_ICACHE_REFILL_WAR) {
 681                 __asm__ __volatile__ (
 682                         ".set push\n\t"
 683                         ".set noat\n\t"
 684                         ".set mips3\n\t"
 685 #ifdef CONFIG_32BIT
 686                         "la     $at,1f\n\t"
 687 #endif
 688 #ifdef CONFIG_64BIT
 689                         "dla    $at,1f\n\t"
 690 #endif
 691                         "cache  %0,($at)\n\t"
 692                         "nop; nop; nop\n"
 693                         "1:\n\t"
 694                         ".set pop"
 695                         :
 696                         : "i" (Hit_Invalidate_I));
 697         }
 698         if (MIPS_CACHE_SYNC_WAR)
 699                 __asm__ __volatile__ ("sync");
 700 }
 701
 702 static void r4k_flush_cache_sigtramp(unsigned long addr)
 703 {
 704         r4k_on_each_cpu(local_r4k_flush_cache_sigtramp, (void *) addr);
 705 }
 706
 707 static void r4k_flush_icache_all(void)
 708 {
 709         if (cpu_has_vtag_icache)
 710                 r4k_blast_icache();
 711 }
 712
 713 struct flush_kernel_vmap_range_args {
 714         unsigned long   vaddr;
 715         int             size;
 716 };
 717
 718 static inline void local_r4k_flush_kernel_vmap_range(void *args)
 719 {
 720         struct flush_kernel_vmap_range_args *vmra = args;
 721         unsigned long vaddr = vmra->vaddr;
 722         int size = vmra->size;
 723
 724         /*
 725          * Aliases only affect the primary caches so don't bother with
 726          * S-caches or T-caches.
 727          */
 728         if (cpu_has_safe_index_cacheops && size >= dcache_size)
 729                 r4k_blast_dcache();
 730         else {
 731                 R4600_HIT_CACHEOP_WAR_IMPL;
 732                 blast_dcache_range(vaddr, vaddr + size);
 733         }
 734 }
 735
 736 static void r4k_flush_kernel_vmap_range(unsigned long vaddr, int size)
 737 {
 738         struct flush_kernel_vmap_range_args args;
 739
 740         args.vaddr = (unsigned long) vaddr;
 741         args.size = size;
 742
 743         r4k_on_each_cpu(local_r4k_flush_kernel_vmap_range, &args);
 744 }
 745
 746 static inline void rm7k_erratum31(void)
 747 {
 748         const unsigned long ic_lsize = 32;
 749         unsigned long addr;
 750
 751         /* RM7000 erratum #31. The icache is screwed at startup. */
 752         write_c0_taglo(0);
 753         write_c0_taghi(0);
 754
 755         for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) {
 756                 __asm__ __volatile__ (
 757                         ".set push\n\t"
 758                         ".set noreorder\n\t"
 759                         ".set mips3\n\t"
 760                         "cache\t%1, 0(%0)\n\t"
 761                         "cache\t%1, 0x1000(%0)\n\t"
 762                         "cache\t%1, 0x2000(%0)\n\t"
 763                         "cache\t%1, 0x3000(%0)\n\t"
 764                         "cache\t%2, 0(%0)\n\t"
 765                         "cache\t%2, 0x1000(%0)\n\t"
 766                         "cache\t%2, 0x2000(%0)\n\t"
 767                         "cache\t%2, 0x3000(%0)\n\t"
 768                         "cache\t%1, 0(%0)\n\t"
 769                         "cache\t%1, 0x1000(%0)\n\t"
 770                         "cache\t%1, 0x2000(%0)\n\t"
 771                         "cache\t%1, 0x3000(%0)\n\t"
 772                         ".set pop\n"
 773                         :
 774                         : "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill));
 775         }
 776 }
 777
 778 static inline void alias_74k_erratum(struct cpuinfo_mips *c)
 779 {
 780         /*
 781          * Early versions of the 74K do not update the cache tags on a
 782          * vtag miss/ptag hit which can occur in the case of KSEG0/KUSEG
 783          * aliases. In this case it is better to treat the cache as always
 784          * having aliases.
 785          */
 786         if ((c->processor_id & 0xff) <= PRID_REV_ENCODE_332(2, 4, 0))
 787                 c->dcache.flags |= MIPS_CACHE_VTAG;
 788         if ((c->processor_id & 0xff) == PRID_REV_ENCODE_332(2, 4, 0))
 789                 write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND);
 790         if (((c->processor_id & 0xff00) == PRID_IMP_1074K) &&
 791             ((c->processor_id & 0xff) <= PRID_REV_ENCODE_332(1, 1, 0))) {
 792                 c->dcache.flags |= MIPS_CACHE_VTAG;
 793                 write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND);
 794         }
 795 }
 796
 797 static char *way_string[] __cpuinitdata = { NULL, "direct mapped", "2-way",
 798         "3-way", "4-way", "5-way", "6-way", "7-way", "8-way"
 799 };
 800
 801 static void __cpuinit probe_pcache(void)
 802 {
 803         struct cpuinfo_mips *c = &current_cpu_data;
 804         unsigned int config = read_c0_config();
 805         unsigned int prid = read_c0_prid();
 806         unsigned long config1;
 807         unsigned int lsize;
 808
 809         switch (c->cputype) {
 810         case CPU_R4600:                 /* QED style two way caches? */
 811         case CPU_R4700:
 812         case CPU_R5000:
 813         case CPU_NEVADA:
 814                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 815                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 816                 c->icache.ways = 2;
 817                 c->icache.waybit = __ffs(icache_size/2);
 818
 819                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 820                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 821                 c->dcache.ways = 2;
 822                 c->dcache.waybit= __ffs(dcache_size/2);
 823
 824                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 825                 break;
 826
 827         case CPU_R5432:
 828         case CPU_R5500:
 829                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 830                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 831                 c->icache.ways = 2;
 832                 c->icache.waybit= 0;
 833
 834                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 835                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 836                 c->dcache.ways = 2;
 837                 c->dcache.waybit = 0;
 838
 839                 c->options |= MIPS_CPU_CACHE_CDEX_P | MIPS_CPU_PREFETCH;
 840                 break;
 841
 842         case CPU_TX49XX:
 843                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 844                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 845                 c->icache.ways = 4;
 846                 c->icache.waybit= 0;
 847
 848                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 849                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 850                 c->dcache.ways = 4;
 851                 c->dcache.waybit = 0;
 852
 853                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 854                 c->options |= MIPS_CPU_PREFETCH;
 855                 break;
 856
 857         case CPU_R4000PC:
 858         case CPU_R4000SC:
 859         case CPU_R4000MC:
 860         case CPU_R4400PC:
 861         case CPU_R4400SC:
 862         case CPU_R4400MC:
 863         case CPU_R4300:
 864                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 865                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 866                 c->icache.ways = 1;
 867                 c->icache.waybit = 0;   /* doesn't matter */
 868
 869                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 870                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 871                 c->dcache.ways = 1;
 872                 c->dcache.waybit = 0;   /* does not matter */
 873
 874                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 875                 break;
 876
 877         case CPU_R10000:
 878         case CPU_R12000:
 879         case CPU_R14000:
 880                 icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29));
 881                 c->icache.linesz = 64;
 882                 c->icache.ways = 2;
 883                 c->icache.waybit = 0;
 884
 885                 dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26));
 886                 c->dcache.linesz = 32;
 887                 c->dcache.ways = 2;
 888                 c->dcache.waybit = 0;
 889
 890                 c->options |= MIPS_CPU_PREFETCH;
 891                 break;
 892
 893         case CPU_VR4133:
 894                 write_c0_config(config & ~VR41_CONF_P4K);
 895         case CPU_VR4131:
 896                 /* Workaround for cache instruction bug of VR4131 */
 897                 if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U ||
 898                     c->processor_id == 0x0c82U) {
 899                         config |= 0x00400000U;
 900                         if (c->processor_id == 0x0c80U)
 901                                 config |= VR41_CONF_BP;
 902                         write_c0_config(config);
 903                 } else
 904                         c->options |= MIPS_CPU_CACHE_CDEX_P;
 905
 906                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
 907                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 908                 c->icache.ways = 2;
 909                 c->icache.waybit = __ffs(icache_size/2);
 910
 911                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
 912                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 913                 c->dcache.ways = 2;
 914                 c->dcache.waybit = __ffs(dcache_size/2);
 915                 break;
 916
 917         case CPU_VR41XX:
 918         case CPU_VR4111:
 919         case CPU_VR4121:
 920         case CPU_VR4122:
 921         case CPU_VR4181:
 922         case CPU_VR4181A:
 923                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
 924                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 925                 c->icache.ways = 1;
 926                 c->icache.waybit = 0;   /* doesn't matter */
 927
 928                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
 929                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 930                 c->dcache.ways = 1;
 931                 c->dcache.waybit = 0;   /* does not matter */
 932
 933                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 934                 break;
 935
 936         case CPU_RM7000:
 937                 rm7k_erratum31();
 938
 939                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 940                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 941                 c->icache.ways = 4;
 942                 c->icache.waybit = __ffs(icache_size / c->icache.ways);
 943
 944                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 945                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 946                 c->dcache.ways = 4;
 947                 c->dcache.waybit = __ffs(dcache_size / c->dcache.ways);
 948
 949                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 950                 c->options |= MIPS_CPU_PREFETCH;
 951                 break;
 952
 953         case CPU_LOONGSON2:
 954                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 955                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 956                 if (prid & 0x3)
 957                         c->icache.ways = 4;
 958                 else
 959                         c->icache.ways = 2;
 960                 c->icache.waybit = 0;
 961
 962                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 963                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 964                 if (prid & 0x3)
 965                         c->dcache.ways = 4;
 966                 else
 967                         c->dcache.ways = 2;
 968                 c->dcache.waybit = 0;
 969                 break;
 970
 971         default:
 972                 if (!(config & MIPS_CONF_M))
 973                         panic("Don't know how to probe P-caches on this cpu.");
 974
 975                 /*
 976                  * So we seem to be a MIPS32 or MIPS64 CPU
 977                  * So let's probe the I-cache ...
 978                  */
 979                 config1 = read_c0_config1();
 980
 981                 if ((lsize = ((config1 >> 19) & 7)))
 982                         c->icache.linesz = 2 << lsize;
 983                 else
 984                         c->icache.linesz = lsize;
 985                 c->icache.sets = 32 << (((config1 >> 22) + 1) & 7);
 986                 c->icache.ways = 1 + ((config1 >> 16) & 7);
 987
 988                 icache_size = c->icache.sets *
 989                               c->icache.ways *
 990                               c->icache.linesz;
 991                 c->icache.waybit = __ffs(icache_size/c->icache.ways);
 992
 993                 if (config & 0x8)               /* VI bit */
 994                         c->icache.flags |= MIPS_CACHE_VTAG;
 995
 996                 /*
 997                  * Now probe the MIPS32 / MIPS64 data cache.
 998                  */
 999                 c->dcache.flags = 0;
1000
1001                 if ((lsize = ((config1 >> 10) & 7)))
1002                         c->dcache.linesz = 2 << lsize;
1003                 else
1004                         c->dcache.linesz= lsize;
1005                 c->dcache.sets = 32 << (((config1 >> 13) + 1) & 7);
1006                 c->dcache.ways = 1 + ((config1 >> 7) & 7);
1007
1008                 dcache_size = c->dcache.sets *
1009                               c->dcache.ways *
1010                               c->dcache.linesz;
1011                 c->dcache.waybit = __ffs(dcache_size/c->dcache.ways);
1012
1013                 c->options |= MIPS_CPU_PREFETCH;
1014                 break;
1015         }
1016
1017         /*
1018          * Processor configuration sanity check for the R4000SC erratum
1019          * #5.  With page sizes larger than 32kB there is no possibility
1020          * to get a VCE exception anymore so we don't care about this
1021          * misconfiguration.  The case is rather theoretical anyway;
1022          * presumably no vendor is shipping his hardware in the "bad"
1023          * configuration.
1024          */
1025         if ((prid & 0xff00) == PRID_IMP_R4000 && (prid & 0xff) < 0x40 &&
1026             !(config & CONF_SC) && c->icache.linesz != 16 &&
1027             PAGE_SIZE <= 0x8000)
1028                 panic("Improper R4000SC processor configuration detected");
1029
1030         /* compute a couple of other cache variables */
1031         c->icache.waysize = icache_size / c->icache.ways;
1032         c->dcache.waysize = dcache_size / c->dcache.ways;
1033
1034         c->icache.sets = c->icache.linesz ?
1035                 icache_size / (c->icache.linesz * c->icache.ways) : 0;
1036         c->dcache.sets = c->dcache.linesz ?
1037                 dcache_size / (c->dcache.linesz * c->dcache.ways) : 0;
1038
1039         /*
1040          * R10000 and R12000 P-caches are odd in a positive way.  They're 32kB
1041          * 2-way virtually indexed so normally would suffer from aliases.  So
1042          * normally they'd suffer from aliases but magic in the hardware deals
1043          * with that for us so we don't need to take care ourselves.
1044          */
1045         switch (c->cputype) {
1046         case CPU_20KC:
1047         case CPU_25KF:
1048         case CPU_SB1:
1049         case CPU_SB1A:
1050         case CPU_XLR:
1051                 c->dcache.flags |= MIPS_CACHE_PINDEX;
1052                 break;
1053
1054         case CPU_R10000:
1055         case CPU_R12000:
1056         case CPU_R14000:
1057                 break;
1058
1059         case CPU_M14KC:
1060         case CPU_24K:
1061         case CPU_34K:
1062         case CPU_74K:
1063         case CPU_1004K:
1064                 if (c->cputype == CPU_74K)
1065                         alias_74k_erratum(c);
1066                 if ((read_c0_config7() & (1 << 16))) {
1067                         /* effectively physically indexed dcache,
1068                            thus no virtual aliases. */
1069                         c->dcache.flags |= MIPS_CACHE_PINDEX;
1070                         break;
1071                 }
1072         default:
1073                 if (c->dcache.waysize > PAGE_SIZE)
1074                         c->dcache.flags |= MIPS_CACHE_ALIASES;
1075         }
1076
1077         switch (c->cputype) {
1078         case CPU_20KC:
1079                 /*
1080                  * Some older 20Kc chips doesn't have the 'VI' bit in
1081                  * the config register.
1082                  */
1083                 c->icache.flags |= MIPS_CACHE_VTAG;
1084                 break;
1085
1086         case CPU_ALCHEMY:
1087                 c->icache.flags |= MIPS_CACHE_IC_F_DC;
1088                 break;
1089         }
1090
1091 #ifdef  CONFIG_CPU_LOONGSON2
1092         /*
1093          * LOONGSON2 has 4 way icache, but when using indexed cache op,
1094          * one op will act on all 4 ways
1095          */
1096         c->icache.ways = 1;
1097 #endif
1098
1099         printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
1100                icache_size >> 10,
1101                c->icache.flags & MIPS_CACHE_VTAG ? "VIVT" : "VIPT",
1102                way_string[c->icache.ways], c->icache.linesz);
1103
1104         printk("Primary data cache %ldkB, %s, %s, %s, linesize %d bytes\n",
1105                dcache_size >> 10, way_string[c->dcache.ways],
1106                (c->dcache.flags & MIPS_CACHE_PINDEX) ? "PIPT" : "VIPT",
1107                (c->dcache.flags & MIPS_CACHE_ALIASES) ?
1108                         "cache aliases" : "no aliases",
1109                c->dcache.linesz);
1110 }
1111
1112 /*
1113  * If you even _breathe_ on this function, look at the gcc output and make sure
1114  * it does not pop things on and off the stack for the cache sizing loop that
1115  * executes in KSEG1 space or else you will crash and burn badly.  You have
1116  * been warned.
1117  */
1118 static int __cpuinit probe_scache(void)
1119 {
1120         unsigned long flags, addr, begin, end, pow2;
1121         unsigned int config = read_c0_config();
1122         struct cpuinfo_mips *c = &current_cpu_data;
1123
1124         if (config & CONF_SC)
1125                 return 0;
1126
1127         begin = (unsigned long) &_stext;
1128         begin &= ~((4 * 1024 * 1024) - 1);
1129         end = begin + (4 * 1024 * 1024);
1130
1131         /*
1132          * This is such a bitch, you'd think they would make it easy to do
1133          * this.  Away you daemons of stupidity!
1134          */
1135         local_irq_save(flags);
1136
1137         /* Fill each size-multiple cache line with a valid tag. */
1138         pow2 = (64 * 1024);
1139         for (addr = begin; addr < end; addr = (begin + pow2)) {
1140                 unsigned long *p = (unsigned long *) addr;
1141                 __asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
1142                 pow2 <<= 1;
1143         }
1144
1145         /* Load first line with zero (therefore invalid) tag. */
1146         write_c0_taglo(0);
1147         write_c0_taghi(0);
1148         __asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
1149         cache_op(Index_Store_Tag_I, begin);
1150         cache_op(Index_Store_Tag_D, begin);
1151         cache_op(Index_Store_Tag_SD, begin);
1152
1153         /* Now search for the wrap around point. */
1154         pow2 = (128 * 1024);
1155         for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) {
1156                 cache_op(Index_Load_Tag_SD, addr);
1157                 __asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
1158                 if (!read_c0_taglo())
1159                         break;
1160                 pow2 <<= 1;
1161         }
1162         local_irq_restore(flags);
1163         addr -= begin;
1164
1165         scache_size = addr;
1166         c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22);
1167         c->scache.ways = 1;
1168         c->dcache.waybit = 0;           /* does not matter */
1169
1170         return 1;
1171 }
1172
1173 #if defined(CONFIG_CPU_LOONGSON2)
1174 static void __init loongson2_sc_init(void)
1175 {
1176         struct cpuinfo_mips *c = &current_cpu_data;
1177
1178         scache_size = 512*1024;
1179         c->scache.linesz = 32;
1180         c->scache.ways = 4;
1181         c->scache.waybit = 0;
1182         c->scache.waysize = scache_size / (c->scache.ways);
1183         c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1184         pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1185                scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1186
1187         c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1188 }
1189 #endif
1190
1191 extern int r5k_sc_init(void);
1192 extern int rm7k_sc_init(void);
1193 extern int mips_sc_init(void);
1194
1195 static void __cpuinit setup_scache(void)
1196 {
1197         struct cpuinfo_mips *c = &current_cpu_data;
1198         unsigned int config = read_c0_config();
1199         int sc_present = 0;
1200
1201         /*
1202          * Do the probing thing on R4000SC and R4400SC processors.  Other
1203          * processors don't have a S-cache that would be relevant to the
1204          * Linux memory management.
1205          */
1206         switch (c->cputype) {
1207         case CPU_R4000SC:
1208         case CPU_R4000MC:
1209         case CPU_R4400SC:
1210         case CPU_R4400MC:
1211                 sc_present = run_uncached(probe_scache);
1212                 if (sc_present)
1213                         c->options |= MIPS_CPU_CACHE_CDEX_S;
1214                 break;
1215
1216         case CPU_R10000:
1217         case CPU_R12000:
1218         case CPU_R14000:
1219                 scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16);
1220                 c->scache.linesz = 64 << ((config >> 13) & 1);
1221                 c->scache.ways = 2;
1222                 c->scache.waybit= 0;
1223                 sc_present = 1;
1224                 break;
1225
1226         case CPU_R5000:
1227         case CPU_NEVADA:
1228 #ifdef CONFIG_R5000_CPU_SCACHE
1229                 r5k_sc_init();
1230 #endif
1231                 return;
1232
1233         case CPU_RM7000:
1234 #ifdef CONFIG_RM7000_CPU_SCACHE
1235                 rm7k_sc_init();
1236 #endif
1237                 return;
1238
1239 #if defined(CONFIG_CPU_LOONGSON2)
1240         case CPU_LOONGSON2:
1241                 loongson2_sc_init();
1242                 return;
1243 #endif
1244         case CPU_XLP:
1245                 /* don't need to worry about L2, fully coherent */
1246                 return;
1247
1248         default:
1249                 if (c->isa_level == MIPS_CPU_ISA_M32R1 ||
1250                     c->isa_level == MIPS_CPU_ISA_M32R2 ||
1251                     c->isa_level == MIPS_CPU_ISA_M64R1 ||
1252                     c->isa_level == MIPS_CPU_ISA_M64R2) {
1253 #ifdef CONFIG_MIPS_CPU_SCACHE
1254                         if (mips_sc_init ()) {
1255                                 scache_size = c->scache.ways * c->scache.sets * c->scache.linesz;
1256                                 printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n",
1257                                        scache_size >> 10,
1258                                        way_string[c->scache.ways], c->scache.linesz);
1259                         }
1260 #else
1261                         if (!(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
1262                                 panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
1263 #endif
1264                         return;
1265                 }
1266                 sc_present = 0;
1267         }
1268
1269         if (!sc_present)
1270                 return;
1271
1272         /* compute a couple of other cache variables */
1273         c->scache.waysize = scache_size / c->scache.ways;
1274
1275         c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1276
1277         printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1278                scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1279
1280         c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1281 }
1282
1283 void au1x00_fixup_config_od(void)
1284 {
1285         /*
1286          * c0_config.od (bit 19) was write only (and read as 0)
1287          * on the early revisions of Alchemy SOCs.  It disables the bus
1288          * transaction overlapping and needs to be set to fix various errata.
1289          */
1290         switch (read_c0_prid()) {
1291         case 0x00030100: /* Au1000 DA */
1292         case 0x00030201: /* Au1000 HA */
1293         case 0x00030202: /* Au1000 HB */
1294         case 0x01030200: /* Au1500 AB */
1295         /*
1296          * Au1100 errata actually keeps silence about this bit, so we set it
1297          * just in case for those revisions that require it to be set according
1298          * to the (now gone) cpu table.
1299          */
1300         case 0x02030200: /* Au1100 AB */
1301         case 0x02030201: /* Au1100 BA */
1302         case 0x02030202: /* Au1100 BC */
1303                 set_c0_config(1 << 19);
1304                 break;
1305         }
1306 }
1307
1308 /* CP0 hazard avoidance. */
1309 #define NXP_BARRIER()                                                   \
1310          __asm__ __volatile__(                                          \
1311         ".set noreorder\n\t"                                            \
1312         "nop; nop; nop; nop; nop; nop;\n\t"                             \
1313         ".set reorder\n\t")
1314
1315 static void nxp_pr4450_fixup_config(void)
1316 {
1317         unsigned long config0;
1318
1319         config0 = read_c0_config();
1320
1321         /* clear all three cache coherency fields */
1322         config0 &= ~(0x7 | (7 << 25) | (7 << 28));
1323         config0 |= (((_page_cachable_default >> _CACHE_SHIFT) <<  0) |
1324                     ((_page_cachable_default >> _CACHE_SHIFT) << 25) |
1325                     ((_page_cachable_default >> _CACHE_SHIFT) << 28));
1326         write_c0_config(config0);
1327         NXP_BARRIER();
1328 }
1329
1330 static int __cpuinitdata cca = -1;
1331
1332 static int __init cca_setup(char *str)
1333 {
1334         get_option(&str, &cca);
1335
1336         return 0;
1337 }
1338
1339 early_param("cca", cca_setup);
1340
1341 static void __cpuinit coherency_setup(void)
1342 {
1343         if (cca < 0 || cca > 7)
1344                 cca = read_c0_config() & CONF_CM_CMASK;
1345         _page_cachable_default = cca << _CACHE_SHIFT;
1346
1347         pr_debug("Using cache attribute %d\n", cca);
1348         change_c0_config(CONF_CM_CMASK, cca);
1349
1350         /*
1351          * c0_status.cu=0 specifies that updates by the sc instruction use
1352          * the coherency mode specified by the TLB; 1 means cachable
1353          * coherent update on write will be used.  Not all processors have
1354          * this bit and; some wire it to zero, others like Toshiba had the
1355          * silly idea of putting something else there ...
1356          */
1357         switch (current_cpu_type()) {
1358         case CPU_R4000PC:
1359         case CPU_R4000SC:
1360         case CPU_R4000MC:
1361         case CPU_R4400PC:
1362         case CPU_R4400SC:
1363         case CPU_R4400MC:
1364                 clear_c0_config(CONF_CU);
1365                 break;
1366         /*
1367          * We need to catch the early Alchemy SOCs with
1368          * the write-only co_config.od bit and set it back to one on:
1369          * Au1000 rev DA, HA, HB;  Au1100 AB, BA, BC, Au1500 AB
1370          */
1371         case CPU_ALCHEMY:
1372                 au1x00_fixup_config_od();
1373                 break;
1374
1375         case PRID_IMP_PR4450:
1376                 nxp_pr4450_fixup_config();
1377                 break;
1378         }
1379 }
1380
1381 #if defined(CONFIG_DMA_NONCOHERENT)
1382
1383 static int __cpuinitdata coherentio;
1384
1385 static int __init setcoherentio(char *str)
1386 {
1387         coherentio = 1;
1388
1389         return 0;
1390 }
1391
1392 early_param("coherentio", setcoherentio);
1393 #endif
1394
1395 static void __cpuinit r4k_cache_error_setup(void)
1396 {
1397         extern char __weak except_vec2_generic;
1398         extern char __weak except_vec2_sb1;
1399         struct cpuinfo_mips *c = &current_cpu_data;
1400
1401         switch (c->cputype) {
1402         case CPU_SB1:
1403         case CPU_SB1A:
1404                 set_uncached_handler(0x100, &except_vec2_sb1, 0x80);
1405                 break;
1406
1407         default:
1408                 set_uncached_handler(0x100, &except_vec2_generic, 0x80);
1409                 break;
1410         }
1411 }
1412
1413 void __cpuinit r4k_cache_init(void)
1414 {
1415         extern void build_clear_page(void);
1416         extern void build_copy_page(void);
1417         struct cpuinfo_mips *c = &current_cpu_data;
1418
1419         probe_pcache();
1420         setup_scache();
1421
1422         r4k_blast_dcache_page_setup();
1423         r4k_blast_dcache_page_indexed_setup();
1424         r4k_blast_dcache_setup();
1425         r4k_blast_icache_page_setup();
1426         r4k_blast_icache_page_indexed_setup();
1427         r4k_blast_icache_setup();
1428         r4k_blast_scache_page_setup();
1429         r4k_blast_scache_page_indexed_setup();
1430         r4k_blast_scache_setup();
1431
1432         /*
1433          * Some MIPS32 and MIPS64 processors have physically indexed caches.
1434          * This code supports virtually indexed processors and will be
1435          * unnecessarily inefficient on physically indexed processors.
1436          */
1437         if (c->dcache.linesz)
1438                 shm_align_mask = max_t( unsigned long,
1439                                         c->dcache.sets * c->dcache.linesz - 1,
1440                                         PAGE_SIZE - 1);
1441         else
1442                 shm_align_mask = PAGE_SIZE-1;
1443
1444         __flush_cache_vmap      = r4k__flush_cache_vmap;
1445         __flush_cache_vunmap    = r4k__flush_cache_vunmap;
1446
1447         flush_cache_all         = cache_noop;
1448         __flush_cache_all       = r4k___flush_cache_all;
1449         flush_cache_mm          = r4k_flush_cache_mm;
1450         flush_cache_page        = r4k_flush_cache_page;
1451         flush_cache_range       = r4k_flush_cache_range;
1452
1453         __flush_kernel_vmap_range = r4k_flush_kernel_vmap_range;
1454
1455         flush_cache_sigtramp    = r4k_flush_cache_sigtramp;
1456         flush_icache_all        = r4k_flush_icache_all;
1457         local_flush_data_cache_page     = local_r4k_flush_data_cache_page;
1458         flush_data_cache_page   = r4k_flush_data_cache_page;
1459         flush_icache_range      = r4k_flush_icache_range;
1460         local_flush_icache_range        = local_r4k_flush_icache_range;
1461
1462 #if defined(CONFIG_DMA_NONCOHERENT)
1463         if (coherentio) {
1464                 _dma_cache_wback_inv    = (void *)cache_noop;
1465                 _dma_cache_wback        = (void *)cache_noop;
1466                 _dma_cache_inv          = (void *)cache_noop;
1467         } else {
1468                 _dma_cache_wback_inv    = r4k_dma_cache_wback_inv;
1469                 _dma_cache_wback        = r4k_dma_cache_wback_inv;
1470                 _dma_cache_inv          = r4k_dma_cache_inv;
1471         }
1472 #endif
1473
1474         build_clear_page();
1475         build_copy_page();
1476 #if !defined(CONFIG_MIPS_CMP)
1477         local_r4k___flush_cache_all(NULL);
1478 #endif
1479         coherency_setup();
1480         board_cache_error_setup = r4k_cache_error_setup;
1481 }