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 void (* r4k_blast_dcache)(void);
 140 EXPORT_SYMBOL(r4k_blast_dcache);
 141
 142 static void __cpuinit r4k_blast_dcache_setup(void)
 143 {
 144         unsigned long dc_lsize = cpu_dcache_line_size();
 145
 146         if (dc_lsize == 0)
 147                 r4k_blast_dcache = (void *)cache_noop;
 148         else if (dc_lsize == 16)
 149                 r4k_blast_dcache = blast_dcache16;
 150         else if (dc_lsize == 32)
 151                 r4k_blast_dcache = blast_dcache32;
 152         else if (dc_lsize == 64)
 153                 r4k_blast_dcache = blast_dcache64;
 154 }
 155
 156 /* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
 157 #define JUMP_TO_ALIGN(order) \
 158         __asm__ __volatile__( \
 159                 "b\t1f\n\t" \
 160                 ".align\t" #order "\n\t" \
 161                 "1:\n\t" \
 162                 )
 163 #define CACHE32_UNROLL32_ALIGN  JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
 164 #define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
 165
 166 static inline void blast_r4600_v1_icache32(void)
 167 {
 168         unsigned long flags;
 169
 170         local_irq_save(flags);
 171         blast_icache32();
 172         local_irq_restore(flags);
 173 }
 174
 175 static inline void tx49_blast_icache32(void)
 176 {
 177         unsigned long start = INDEX_BASE;
 178         unsigned long end = start + current_cpu_data.icache.waysize;
 179         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 180         unsigned long ws_end = current_cpu_data.icache.ways <<
 181                                current_cpu_data.icache.waybit;
 182         unsigned long ws, addr;
 183
 184         CACHE32_UNROLL32_ALIGN2;
 185         /* I'm in even chunk.  blast odd chunks */
 186         for (ws = 0; ws < ws_end; ws += ws_inc)
 187                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 188                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 189         CACHE32_UNROLL32_ALIGN;
 190         /* I'm in odd chunk.  blast even chunks */
 191         for (ws = 0; ws < ws_end; ws += ws_inc)
 192                 for (addr = start; addr < end; addr += 0x400 * 2)
 193                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 194 }
 195
 196 static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page)
 197 {
 198         unsigned long flags;
 199
 200         local_irq_save(flags);
 201         blast_icache32_page_indexed(page);
 202         local_irq_restore(flags);
 203 }
 204
 205 static inline void tx49_blast_icache32_page_indexed(unsigned long page)
 206 {
 207         unsigned long indexmask = current_cpu_data.icache.waysize - 1;
 208         unsigned long start = INDEX_BASE + (page & indexmask);
 209         unsigned long end = start + PAGE_SIZE;
 210         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 211         unsigned long ws_end = current_cpu_data.icache.ways <<
 212                                current_cpu_data.icache.waybit;
 213         unsigned long ws, addr;
 214
 215         CACHE32_UNROLL32_ALIGN2;
 216         /* I'm in even chunk.  blast odd chunks */
 217         for (ws = 0; ws < ws_end; ws += ws_inc)
 218                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 219                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 220         CACHE32_UNROLL32_ALIGN;
 221         /* I'm in odd chunk.  blast even chunks */
 222         for (ws = 0; ws < ws_end; ws += ws_inc)
 223                 for (addr = start; addr < end; addr += 0x400 * 2)
 224                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 225 }
 226
 227 static void (* r4k_blast_icache_page)(unsigned long addr);
 228
 229 static void __cpuinit r4k_blast_icache_page_setup(void)
 230 {
 231         unsigned long ic_lsize = cpu_icache_line_size();
 232
 233         if (ic_lsize == 0)
 234                 r4k_blast_icache_page = (void *)cache_noop;
 235         else if (ic_lsize == 16)
 236                 r4k_blast_icache_page = blast_icache16_page;
 237         else if (ic_lsize == 32)
 238                 r4k_blast_icache_page = blast_icache32_page;
 239         else if (ic_lsize == 64)
 240                 r4k_blast_icache_page = blast_icache64_page;
 241 }
 242
 243
 244 static void (* r4k_blast_icache_page_indexed)(unsigned long addr);
 245
 246 static void __cpuinit r4k_blast_icache_page_indexed_setup(void)
 247 {
 248         unsigned long ic_lsize = cpu_icache_line_size();
 249
 250         if (ic_lsize == 0)
 251                 r4k_blast_icache_page_indexed = (void *)cache_noop;
 252         else if (ic_lsize == 16)
 253                 r4k_blast_icache_page_indexed = blast_icache16_page_indexed;
 254         else if (ic_lsize == 32) {
 255                 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
 256                         r4k_blast_icache_page_indexed =
 257                                 blast_icache32_r4600_v1_page_indexed;
 258                 else if (TX49XX_ICACHE_INDEX_INV_WAR)
 259                         r4k_blast_icache_page_indexed =
 260                                 tx49_blast_icache32_page_indexed;
 261                 else
 262                         r4k_blast_icache_page_indexed =
 263                                 blast_icache32_page_indexed;
 264         } else if (ic_lsize == 64)
 265                 r4k_blast_icache_page_indexed = blast_icache64_page_indexed;
 266 }
 267
 268 void (* r4k_blast_icache)(void);
 269 EXPORT_SYMBOL(r4k_blast_icache);
 270
 271 static void __cpuinit r4k_blast_icache_setup(void)
 272 {
 273         unsigned long ic_lsize = cpu_icache_line_size();
 274
 275         if (ic_lsize == 0)
 276                 r4k_blast_icache = (void *)cache_noop;
 277         else if (ic_lsize == 16)
 278                 r4k_blast_icache = blast_icache16;
 279         else if (ic_lsize == 32) {
 280                 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
 281                         r4k_blast_icache = blast_r4600_v1_icache32;
 282                 else if (TX49XX_ICACHE_INDEX_INV_WAR)
 283                         r4k_blast_icache = tx49_blast_icache32;
 284                 else
 285                         r4k_blast_icache = blast_icache32;
 286         } else if (ic_lsize == 64)
 287                 r4k_blast_icache = blast_icache64;
 288 }
 289
 290 static void (* r4k_blast_scache_page)(unsigned long addr);
 291
 292 static void __cpuinit r4k_blast_scache_page_setup(void)
 293 {
 294         unsigned long sc_lsize = cpu_scache_line_size();
 295
 296         if (scache_size == 0)
 297                 r4k_blast_scache_page = (void *)cache_noop;
 298         else if (sc_lsize == 16)
 299                 r4k_blast_scache_page = blast_scache16_page;
 300         else if (sc_lsize == 32)
 301                 r4k_blast_scache_page = blast_scache32_page;
 302         else if (sc_lsize == 64)
 303                 r4k_blast_scache_page = blast_scache64_page;
 304         else if (sc_lsize == 128)
 305                 r4k_blast_scache_page = blast_scache128_page;
 306 }
 307
 308 static void (* r4k_blast_scache_page_indexed)(unsigned long addr);
 309
 310 static void __cpuinit r4k_blast_scache_page_indexed_setup(void)
 311 {
 312         unsigned long sc_lsize = cpu_scache_line_size();
 313
 314         if (scache_size == 0)
 315                 r4k_blast_scache_page_indexed = (void *)cache_noop;
 316         else if (sc_lsize == 16)
 317                 r4k_blast_scache_page_indexed = blast_scache16_page_indexed;
 318         else if (sc_lsize == 32)
 319                 r4k_blast_scache_page_indexed = blast_scache32_page_indexed;
 320         else if (sc_lsize == 64)
 321                 r4k_blast_scache_page_indexed = blast_scache64_page_indexed;
 322         else if (sc_lsize == 128)
 323                 r4k_blast_scache_page_indexed = blast_scache128_page_indexed;
 324 }
 325
 326 static void (* r4k_blast_scache)(void);
 327
 328 static void __cpuinit r4k_blast_scache_setup(void)
 329 {
 330         unsigned long sc_lsize = cpu_scache_line_size();
 331
 332         if (scache_size == 0)
 333                 r4k_blast_scache = (void *)cache_noop;
 334         else if (sc_lsize == 16)
 335                 r4k_blast_scache = blast_scache16;
 336         else if (sc_lsize == 32)
 337                 r4k_blast_scache = blast_scache32;
 338         else if (sc_lsize == 64)
 339                 r4k_blast_scache = blast_scache64;
 340         else if (sc_lsize == 128)
 341                 r4k_blast_scache = blast_scache128;
 342 }
 343
 344 static inline void local_r4k___flush_cache_all(void * args)
 345 {
 346 #if defined(CONFIG_CPU_LOONGSON2)
 347         r4k_blast_scache();
 348         return;
 349 #endif
 350         r4k_blast_dcache();
 351         r4k_blast_icache();
 352
 353         switch (current_cpu_type()) {
 354         case CPU_R4000SC:
 355         case CPU_R4000MC:
 356         case CPU_R4400SC:
 357         case CPU_R4400MC:
 358         case CPU_R10000:
 359         case CPU_R12000:
 360         case CPU_R14000:
 361                 r4k_blast_scache();
 362         }
 363 }
 364
 365 static void r4k___flush_cache_all(void)
 366 {
 367         r4k_on_each_cpu(local_r4k___flush_cache_all, NULL);
 368 }
 369
 370 static inline int has_valid_asid(const struct mm_struct *mm)
 371 {
 372 #if defined(CONFIG_MIPS_MT_SMP) || defined(CONFIG_MIPS_MT_SMTC)
 373         int i;
 374
 375         for_each_online_cpu(i)
 376                 if (cpu_context(i, mm))
 377                         return 1;
 378
 379         return 0;
 380 #else
 381         return cpu_context(smp_processor_id(), mm);
 382 #endif
 383 }
 384
 385 static void r4k__flush_cache_vmap(void)
 386 {
 387         r4k_blast_dcache();
 388 }
 389
 390 static void r4k__flush_cache_vunmap(void)
 391 {
 392         r4k_blast_dcache();
 393 }
 394
 395 static inline void local_r4k_flush_cache_range(void * args)
 396 {
 397         struct vm_area_struct *vma = args;
 398         int exec = vma->vm_flags & VM_EXEC;
 399
 400         if (!(has_valid_asid(vma->vm_mm)))
 401                 return;
 402
 403         r4k_blast_dcache();
 404         if (exec)
 405                 r4k_blast_icache();
 406 }
 407
 408 static void r4k_flush_cache_range(struct vm_area_struct *vma,
 409         unsigned long start, unsigned long end)
 410 {
 411         int exec = vma->vm_flags & VM_EXEC;
 412
 413         if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc))
 414                 r4k_on_each_cpu(local_r4k_flush_cache_range, vma);
 415 }
 416
 417 static inline void local_r4k_flush_cache_mm(void * args)
 418 {
 419         struct mm_struct *mm = args;
 420
 421         if (!has_valid_asid(mm))
 422                 return;
 423
 424         /*
 425          * Kludge alert.  For obscure reasons R4000SC and R4400SC go nuts if we
 426          * only flush the primary caches but R10000 and R12000 behave sane ...
 427          * R4000SC and R4400SC indexed S-cache ops also invalidate primary
 428          * caches, so we can bail out early.
 429          */
 430         if (current_cpu_type() == CPU_R4000SC ||
 431             current_cpu_type() == CPU_R4000MC ||
 432             current_cpu_type() == CPU_R4400SC ||
 433             current_cpu_type() == CPU_R4400MC) {
 434                 r4k_blast_scache();
 435                 return;
 436         }
 437
 438         r4k_blast_dcache();
 439 }
 440
 441 static void r4k_flush_cache_mm(struct mm_struct *mm)
 442 {
 443         if (!cpu_has_dc_aliases)
 444                 return;
 445
 446         r4k_on_each_cpu(local_r4k_flush_cache_mm, mm);
 447 }
 448
 449 struct flush_cache_page_args {
 450         struct vm_area_struct *vma;
 451         unsigned long addr;
 452         unsigned long pfn;
 453 };
 454
 455 static inline void local_r4k_flush_cache_page(void *args)
 456 {
 457         struct flush_cache_page_args *fcp_args = args;
 458         struct vm_area_struct *vma = fcp_args->vma;
 459         unsigned long addr = fcp_args->addr;
 460         struct page *page = pfn_to_page(fcp_args->pfn);
 461         int exec = vma->vm_flags & VM_EXEC;
 462         struct mm_struct *mm = vma->vm_mm;
 463         int map_coherent = 0;
 464         pgd_t *pgdp;
 465         pud_t *pudp;
 466         pmd_t *pmdp;
 467         pte_t *ptep;
 468         void *vaddr;
 469
 470         /*
 471          * If ownes no valid ASID yet, cannot possibly have gotten
 472          * this page into the cache.
 473          */
 474         if (!has_valid_asid(mm))
 475                 return;
 476
 477         addr &= PAGE_MASK;
 478         pgdp = pgd_offset(mm, addr);
 479         pudp = pud_offset(pgdp, addr);
 480         pmdp = pmd_offset(pudp, addr);
 481         ptep = pte_offset(pmdp, addr);
 482
 483         /*
 484          * If the page isn't marked valid, the page cannot possibly be
 485          * in the cache.
 486          */
 487         if (!(pte_present(*ptep)))
 488                 return;
 489
 490         if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID))
 491                 vaddr = NULL;
 492         else {
 493                 /*
 494                  * Use kmap_coherent or kmap_atomic to do flushes for
 495                  * another ASID than the current one.
 496                  */
 497                 map_coherent = (cpu_has_dc_aliases &&
 498                                 page_mapped(page) && !Page_dcache_dirty(page));
 499                 if (map_coherent)
 500                         vaddr = kmap_coherent(page, addr);
 501                 else
 502                         vaddr = kmap_atomic(page);
 503                 addr = (unsigned long)vaddr;
 504         }
 505
 506         if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
 507                 r4k_blast_dcache_page(addr);
 508                 if (exec && !cpu_icache_snoops_remote_store)
 509                         r4k_blast_scache_page(addr);
 510         }
 511         if (exec) {
 512                 if (vaddr && cpu_has_vtag_icache && mm == current->active_mm) {
 513                         int cpu = smp_processor_id();
 514
 515                         if (cpu_context(cpu, mm) != 0)
 516                                 drop_mmu_context(mm, cpu);
 517                 } else
 518                         r4k_blast_icache_page(addr);
 519         }
 520
 521         if (vaddr) {
 522                 if (map_coherent)
 523                         kunmap_coherent();
 524                 else
 525                         kunmap_atomic(vaddr);
 526         }
 527 }
 528
 529 static void r4k_flush_cache_page(struct vm_area_struct *vma,
 530         unsigned long addr, unsigned long pfn)
 531 {
 532         struct flush_cache_page_args args;
 533
 534         args.vma = vma;
 535         args.addr = addr;
 536         args.pfn = pfn;
 537
 538         r4k_on_each_cpu(local_r4k_flush_cache_page, &args);
 539 }
 540
 541 static inline void local_r4k_flush_data_cache_page(void * addr)
 542 {
 543         r4k_blast_dcache_page((unsigned long) addr);
 544 }
 545
 546 static void r4k_flush_data_cache_page(unsigned long addr)
 547 {
 548         if (in_atomic())
 549                 local_r4k_flush_data_cache_page((void *)addr);
 550         else
 551                 r4k_on_each_cpu(local_r4k_flush_data_cache_page, (void *) addr);
 552 }
 553
 554 struct flush_icache_range_args {
 555         unsigned long start;
 556         unsigned long end;
 557 };
 558
 559 static inline void local_r4k_flush_icache_range(unsigned long start, unsigned long end)
 560 {
 561         if (!cpu_has_ic_fills_f_dc) {
 562                 if (end - start >= dcache_size) {
 563                         r4k_blast_dcache();
 564                 } else {
 565                         R4600_HIT_CACHEOP_WAR_IMPL;
 566                         protected_blast_dcache_range(start, end);
 567                 }
 568         }
 569
 570         if (end - start > icache_size)
 571                 r4k_blast_icache();
 572         else
 573                 protected_blast_icache_range(start, end);
 574 }
 575
 576 static inline void local_r4k_flush_icache_range_ipi(void *args)
 577 {
 578         struct flush_icache_range_args *fir_args = args;
 579         unsigned long start = fir_args->start;
 580         unsigned long end = fir_args->end;
 581
 582         local_r4k_flush_icache_range(start, end);
 583 }
 584
 585 static void r4k_flush_icache_range(unsigned long start, unsigned long end)
 586 {
 587         struct flush_icache_range_args args;
 588
 589         args.start = start;
 590         args.end = end;
 591
 592         r4k_on_each_cpu(local_r4k_flush_icache_range_ipi, &args);
 593         instruction_hazard();
 594 }
 595
 596 #ifdef CONFIG_DMA_NONCOHERENT
 597
 598 static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
 599 {
 600         /* Catch bad driver code */
 601         BUG_ON(size == 0);
 602
 603         if (cpu_has_inclusive_pcaches) {
 604                 if (size >= scache_size)
 605                         r4k_blast_scache();
 606                 else
 607                         blast_scache_range(addr, addr + size);
 608                 __sync();
 609                 return;
 610         }
 611
 612         /*
 613          * Either no secondary cache or the available caches don't have the
 614          * subset property so we have to flush the primary caches
 615          * explicitly
 616          */
 617         if (cpu_has_safe_index_cacheops && size >= dcache_size) {
 618                 r4k_blast_dcache();
 619         } else {
 620                 R4600_HIT_CACHEOP_WAR_IMPL;
 621                 blast_dcache_range(addr, addr + size);
 622         }
 623
 624         bc_wback_inv(addr, size);
 625         __sync();
 626 }
 627
 628 static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
 629 {
 630         /* Catch bad driver code */
 631         BUG_ON(size == 0);
 632
 633         if (cpu_has_inclusive_pcaches) {
 634                 if (size >= scache_size)
 635                         r4k_blast_scache();
 636                 else {
 637                         /*
 638                          * There is no clearly documented alignment requirement
 639                          * for the cache instruction on MIPS processors and
 640                          * some processors, among them the RM5200 and RM7000
 641                          * QED processors will throw an address error for cache
 642                          * hit ops with insufficient alignment.  Solved by
 643                          * aligning the address to cache line size.
 644                          */
 645                         blast_inv_scache_range(addr, addr + size);
 646                 }
 647                 __sync();
 648                 return;
 649         }
 650
 651         if (cpu_has_safe_index_cacheops && size >= dcache_size) {
 652                 r4k_blast_dcache();
 653         } else {
 654                 R4600_HIT_CACHEOP_WAR_IMPL;
 655                 blast_inv_dcache_range(addr, addr + size);
 656         }
 657
 658         bc_inv(addr, size);
 659         __sync();
 660 }
 661 #endif /* CONFIG_DMA_NONCOHERENT */
 662
 663 /*
 664  * While we're protected against bad userland addresses we don't care
 665  * very much about what happens in that case.  Usually a segmentation
 666  * fault will dump the process later on anyway ...
 667  */
 668 static void local_r4k_flush_cache_sigtramp(void * arg)
 669 {
 670         unsigned long ic_lsize = cpu_icache_line_size();
 671         unsigned long dc_lsize = cpu_dcache_line_size();
 672         unsigned long sc_lsize = cpu_scache_line_size();
 673         unsigned long addr = (unsigned long) arg;
 674
 675         R4600_HIT_CACHEOP_WAR_IMPL;
 676         if (dc_lsize)
 677                 protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
 678         if (!cpu_icache_snoops_remote_store && scache_size)
 679                 protected_writeback_scache_line(addr & ~(sc_lsize - 1));
 680         if (ic_lsize)
 681                 protected_flush_icache_line(addr & ~(ic_lsize - 1));
 682         if (MIPS4K_ICACHE_REFILL_WAR) {
 683                 __asm__ __volatile__ (
 684                         ".set push\n\t"
 685                         ".set noat\n\t"
 686                         ".set mips3\n\t"
 687 #ifdef CONFIG_32BIT
 688                         "la     $at,1f\n\t"
 689 #endif
 690 #ifdef CONFIG_64BIT
 691                         "dla    $at,1f\n\t"
 692 #endif
 693                         "cache  %0,($at)\n\t"
 694                         "nop; nop; nop\n"
 695                         "1:\n\t"
 696                         ".set pop"
 697                         :
 698                         : "i" (Hit_Invalidate_I));
 699         }
 700         if (MIPS_CACHE_SYNC_WAR)
 701                 __asm__ __volatile__ ("sync");
 702 }
 703
 704 static void r4k_flush_cache_sigtramp(unsigned long addr)
 705 {
 706         r4k_on_each_cpu(local_r4k_flush_cache_sigtramp, (void *) addr);
 707 }
 708
 709 static void r4k_flush_icache_all(void)
 710 {
 711         if (cpu_has_vtag_icache)
 712                 r4k_blast_icache();
 713 }
 714
 715 struct flush_kernel_vmap_range_args {
 716         unsigned long   vaddr;
 717         int             size;
 718 };
 719
 720 static inline void local_r4k_flush_kernel_vmap_range(void *args)
 721 {
 722         struct flush_kernel_vmap_range_args *vmra = args;
 723         unsigned long vaddr = vmra->vaddr;
 724         int size = vmra->size;
 725
 726         /*
 727          * Aliases only affect the primary caches so don't bother with
 728          * S-caches or T-caches.
 729          */
 730         if (cpu_has_safe_index_cacheops && size >= dcache_size)
 731                 r4k_blast_dcache();
 732         else {
 733                 R4600_HIT_CACHEOP_WAR_IMPL;
 734                 blast_dcache_range(vaddr, vaddr + size);
 735         }
 736 }
 737
 738 static void r4k_flush_kernel_vmap_range(unsigned long vaddr, int size)
 739 {
 740         struct flush_kernel_vmap_range_args args;
 741
 742         args.vaddr = (unsigned long) vaddr;
 743         args.size = size;
 744
 745         r4k_on_each_cpu(local_r4k_flush_kernel_vmap_range, &args);
 746 }
 747
 748 static inline void rm7k_erratum31(void)
 749 {
 750         const unsigned long ic_lsize = 32;
 751         unsigned long addr;
 752
 753         /* RM7000 erratum #31. The icache is screwed at startup. */
 754         write_c0_taglo(0);
 755         write_c0_taghi(0);
 756
 757         for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) {
 758                 __asm__ __volatile__ (
 759                         ".set push\n\t"
 760                         ".set noreorder\n\t"
 761                         ".set mips3\n\t"
 762                         "cache\t%1, 0(%0)\n\t"
 763                         "cache\t%1, 0x1000(%0)\n\t"
 764                         "cache\t%1, 0x2000(%0)\n\t"
 765                         "cache\t%1, 0x3000(%0)\n\t"
 766                         "cache\t%2, 0(%0)\n\t"
 767                         "cache\t%2, 0x1000(%0)\n\t"
 768                         "cache\t%2, 0x2000(%0)\n\t"
 769                         "cache\t%2, 0x3000(%0)\n\t"
 770                         "cache\t%1, 0(%0)\n\t"
 771                         "cache\t%1, 0x1000(%0)\n\t"
 772                         "cache\t%1, 0x2000(%0)\n\t"
 773                         "cache\t%1, 0x3000(%0)\n\t"
 774                         ".set pop\n"
 775                         :
 776                         : "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill));
 777         }
 778 }
 779
 780 static inline void alias_74k_erratum(struct cpuinfo_mips *c)
 781 {
 782         /*
 783          * Early versions of the 74K do not update the cache tags on a
 784          * vtag miss/ptag hit which can occur in the case of KSEG0/KUSEG
 785          * aliases. In this case it is better to treat the cache as always
 786          * having aliases.
 787          */
 788         if ((c->processor_id & 0xff) <= PRID_REV_ENCODE_332(2, 4, 0))
 789                 c->dcache.flags |= MIPS_CACHE_VTAG;
 790         if ((c->processor_id & 0xff) == PRID_REV_ENCODE_332(2, 4, 0))
 791                 write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND);
 792         if (((c->processor_id & 0xff00) == PRID_IMP_1074K) &&
 793             ((c->processor_id & 0xff) <= PRID_REV_ENCODE_332(1, 1, 0))) {
 794                 c->dcache.flags |= MIPS_CACHE_VTAG;
 795                 write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND);
 796         }
 797 }
 798
 799 static char *way_string[] __cpuinitdata = { NULL, "direct mapped", "2-way",
 800         "3-way", "4-way", "5-way", "6-way", "7-way", "8-way"
 801 };
 802
 803 static void __cpuinit probe_pcache(void)
 804 {
 805         struct cpuinfo_mips *c = &current_cpu_data;
 806         unsigned int config = read_c0_config();
 807         unsigned int prid = read_c0_prid();
 808         unsigned long config1;
 809         unsigned int lsize;
 810
 811         switch (c->cputype) {
 812         case CPU_R4600:                 /* QED style two way caches? */
 813         case CPU_R4700:
 814         case CPU_R5000:
 815         case CPU_NEVADA:
 816                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 817                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 818                 c->icache.ways = 2;
 819                 c->icache.waybit = __ffs(icache_size/2);
 820
 821                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 822                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 823                 c->dcache.ways = 2;
 824                 c->dcache.waybit= __ffs(dcache_size/2);
 825
 826                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 827                 break;
 828
 829         case CPU_R5432:
 830         case CPU_R5500:
 831                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 832                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 833                 c->icache.ways = 2;
 834                 c->icache.waybit= 0;
 835
 836                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 837                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 838                 c->dcache.ways = 2;
 839                 c->dcache.waybit = 0;
 840
 841                 c->options |= MIPS_CPU_CACHE_CDEX_P | MIPS_CPU_PREFETCH;
 842                 break;
 843
 844         case CPU_TX49XX:
 845                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 846                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 847                 c->icache.ways = 4;
 848                 c->icache.waybit= 0;
 849
 850                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 851                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 852                 c->dcache.ways = 4;
 853                 c->dcache.waybit = 0;
 854
 855                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 856                 c->options |= MIPS_CPU_PREFETCH;
 857                 break;
 858
 859         case CPU_R4000PC:
 860         case CPU_R4000SC:
 861         case CPU_R4000MC:
 862         case CPU_R4400PC:
 863         case CPU_R4400SC:
 864         case CPU_R4400MC:
 865         case CPU_R4300:
 866                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 867                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 868                 c->icache.ways = 1;
 869                 c->icache.waybit = 0;   /* doesn't matter */
 870
 871                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 872                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 873                 c->dcache.ways = 1;
 874                 c->dcache.waybit = 0;   /* does not matter */
 875
 876                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 877                 break;
 878
 879         case CPU_R10000:
 880         case CPU_R12000:
 881         case CPU_R14000:
 882                 icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29));
 883                 c->icache.linesz = 64;
 884                 c->icache.ways = 2;
 885                 c->icache.waybit = 0;
 886
 887                 dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26));
 888                 c->dcache.linesz = 32;
 889                 c->dcache.ways = 2;
 890                 c->dcache.waybit = 0;
 891
 892                 c->options |= MIPS_CPU_PREFETCH;
 893                 break;
 894
 895         case CPU_VR4133:
 896                 write_c0_config(config & ~VR41_CONF_P4K);
 897         case CPU_VR4131:
 898                 /* Workaround for cache instruction bug of VR4131 */
 899                 if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U ||
 900                     c->processor_id == 0x0c82U) {
 901                         config |= 0x00400000U;
 902                         if (c->processor_id == 0x0c80U)
 903                                 config |= VR41_CONF_BP;
 904                         write_c0_config(config);
 905                 } else
 906                         c->options |= MIPS_CPU_CACHE_CDEX_P;
 907
 908                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
 909                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 910                 c->icache.ways = 2;
 911                 c->icache.waybit = __ffs(icache_size/2);
 912
 913                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
 914                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 915                 c->dcache.ways = 2;
 916                 c->dcache.waybit = __ffs(dcache_size/2);
 917                 break;
 918
 919         case CPU_VR41XX:
 920         case CPU_VR4111:
 921         case CPU_VR4121:
 922         case CPU_VR4122:
 923         case CPU_VR4181:
 924         case CPU_VR4181A:
 925                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
 926                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 927                 c->icache.ways = 1;
 928                 c->icache.waybit = 0;   /* doesn't matter */
 929
 930                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
 931                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 932                 c->dcache.ways = 1;
 933                 c->dcache.waybit = 0;   /* does not matter */
 934
 935                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 936                 break;
 937
 938         case CPU_RM7000:
 939                 rm7k_erratum31();
 940
 941                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 942                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 943                 c->icache.ways = 4;
 944                 c->icache.waybit = __ffs(icache_size / c->icache.ways);
 945
 946                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 947                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 948                 c->dcache.ways = 4;
 949                 c->dcache.waybit = __ffs(dcache_size / c->dcache.ways);
 950
 951                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 952                 c->options |= MIPS_CPU_PREFETCH;
 953                 break;
 954
 955         case CPU_LOONGSON2:
 956                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 957                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 958                 if (prid & 0x3)
 959                         c->icache.ways = 4;
 960                 else
 961                         c->icache.ways = 2;
 962                 c->icache.waybit = 0;
 963
 964                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 965                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 966                 if (prid & 0x3)
 967                         c->dcache.ways = 4;
 968                 else
 969                         c->dcache.ways = 2;
 970                 c->dcache.waybit = 0;
 971                 break;
 972
 973         default:
 974                 if (!(config & MIPS_CONF_M))
 975                         panic("Don't know how to probe P-caches on this cpu.");
 976
 977                 /*
 978                  * So we seem to be a MIPS32 or MIPS64 CPU
 979                  * So let's probe the I-cache ...
 980                  */
 981                 config1 = read_c0_config1();
 982
 983                 if ((lsize = ((config1 >> 19) & 7)))
 984                         c->icache.linesz = 2 << lsize;
 985                 else
 986                         c->icache.linesz = lsize;
 987                 c->icache.sets = 32 << (((config1 >> 22) + 1) & 7);
 988                 c->icache.ways = 1 + ((config1 >> 16) & 7);
 989
 990                 icache_size = c->icache.sets *
 991                               c->icache.ways *
 992                               c->icache.linesz;
 993                 c->icache.waybit = __ffs(icache_size/c->icache.ways);
 994
 995                 if (config & 0x8)               /* VI bit */
 996                         c->icache.flags |= MIPS_CACHE_VTAG;
 997
 998                 /*
 999                  * Now probe the MIPS32 / MIPS64 data cache.
1000                  */
1001                 c->dcache.flags = 0;
1002
1003                 if ((lsize = ((config1 >> 10) & 7)))
1004                         c->dcache.linesz = 2 << lsize;
1005                 else
1006                         c->dcache.linesz= lsize;
1007                 c->dcache.sets = 32 << (((config1 >> 13) + 1) & 7);
1008                 c->dcache.ways = 1 + ((config1 >> 7) & 7);
1009
1010                 dcache_size = c->dcache.sets *
1011                               c->dcache.ways *
1012                               c->dcache.linesz;
1013                 c->dcache.waybit = __ffs(dcache_size/c->dcache.ways);
1014
1015                 c->options |= MIPS_CPU_PREFETCH;
1016                 break;
1017         }
1018
1019         /*
1020          * Processor configuration sanity check for the R4000SC erratum
1021          * #5.  With page sizes larger than 32kB there is no possibility
1022          * to get a VCE exception anymore so we don't care about this
1023          * misconfiguration.  The case is rather theoretical anyway;
1024          * presumably no vendor is shipping his hardware in the "bad"
1025          * configuration.
1026          */
1027         if ((prid & 0xff00) == PRID_IMP_R4000 && (prid & 0xff) < 0x40 &&
1028             !(config & CONF_SC) && c->icache.linesz != 16 &&
1029             PAGE_SIZE <= 0x8000)
1030                 panic("Improper R4000SC processor configuration detected");
1031
1032         /* compute a couple of other cache variables */
1033         c->icache.waysize = icache_size / c->icache.ways;
1034         c->dcache.waysize = dcache_size / c->dcache.ways;
1035
1036         c->icache.sets = c->icache.linesz ?
1037                 icache_size / (c->icache.linesz * c->icache.ways) : 0;
1038         c->dcache.sets = c->dcache.linesz ?
1039                 dcache_size / (c->dcache.linesz * c->dcache.ways) : 0;
1040
1041         /*
1042          * R10000 and R12000 P-caches are odd in a positive way.  They're 32kB
1043          * 2-way virtually indexed so normally would suffer from aliases.  So
1044          * normally they'd suffer from aliases but magic in the hardware deals
1045          * with that for us so we don't need to take care ourselves.
1046          */
1047         switch (c->cputype) {
1048         case CPU_20KC:
1049         case CPU_25KF:
1050         case CPU_SB1:
1051         case CPU_SB1A:
1052         case CPU_XLR:
1053                 c->dcache.flags |= MIPS_CACHE_PINDEX;
1054                 break;
1055
1056         case CPU_R10000:
1057         case CPU_R12000:
1058         case CPU_R14000:
1059                 break;
1060
1061         case CPU_M14KC:
1062         case CPU_M14KEC:
1063         case CPU_24K:
1064         case CPU_34K:
1065         case CPU_74K:
1066         case CPU_1004K:
1067                 if (c->cputype == CPU_74K)
1068                         alias_74k_erratum(c);
1069                 if ((read_c0_config7() & (1 << 16))) {
1070                         /* effectively physically indexed dcache,
1071                            thus no virtual aliases. */
1072                         c->dcache.flags |= MIPS_CACHE_PINDEX;
1073                         break;
1074                 }
1075         default:
1076                 if (c->dcache.waysize > PAGE_SIZE)
1077                         c->dcache.flags |= MIPS_CACHE_ALIASES;
1078         }
1079
1080         switch (c->cputype) {
1081         case CPU_20KC:
1082                 /*
1083                  * Some older 20Kc chips doesn't have the 'VI' bit in
1084                  * the config register.
1085                  */
1086                 c->icache.flags |= MIPS_CACHE_VTAG;
1087                 break;
1088
1089         case CPU_ALCHEMY:
1090                 c->icache.flags |= MIPS_CACHE_IC_F_DC;
1091                 break;
1092         }
1093
1094 #ifdef  CONFIG_CPU_LOONGSON2
1095         /*
1096          * LOONGSON2 has 4 way icache, but when using indexed cache op,
1097          * one op will act on all 4 ways
1098          */
1099         c->icache.ways = 1;
1100 #endif
1101
1102         printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
1103                icache_size >> 10,
1104                c->icache.flags & MIPS_CACHE_VTAG ? "VIVT" : "VIPT",
1105                way_string[c->icache.ways], c->icache.linesz);
1106
1107         printk("Primary data cache %ldkB, %s, %s, %s, linesize %d bytes\n",
1108                dcache_size >> 10, way_string[c->dcache.ways],
1109                (c->dcache.flags & MIPS_CACHE_PINDEX) ? "PIPT" : "VIPT",
1110                (c->dcache.flags & MIPS_CACHE_ALIASES) ?
1111                         "cache aliases" : "no aliases",
1112                c->dcache.linesz);
1113 }
1114
1115 /*
1116  * If you even _breathe_ on this function, look at the gcc output and make sure
1117  * it does not pop things on and off the stack for the cache sizing loop that
1118  * executes in KSEG1 space or else you will crash and burn badly.  You have
1119  * been warned.
1120  */
1121 static int __cpuinit probe_scache(void)
1122 {
1123         unsigned long flags, addr, begin, end, pow2;
1124         unsigned int config = read_c0_config();
1125         struct cpuinfo_mips *c = &current_cpu_data;
1126
1127         if (config & CONF_SC)
1128                 return 0;
1129
1130         begin = (unsigned long) &_stext;
1131         begin &= ~((4 * 1024 * 1024) - 1);
1132         end = begin + (4 * 1024 * 1024);
1133
1134         /*
1135          * This is such a bitch, you'd think they would make it easy to do
1136          * this.  Away you daemons of stupidity!
1137          */
1138         local_irq_save(flags);
1139
1140         /* Fill each size-multiple cache line with a valid tag. */
1141         pow2 = (64 * 1024);
1142         for (addr = begin; addr < end; addr = (begin + pow2)) {
1143                 unsigned long *p = (unsigned long *) addr;
1144                 __asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
1145                 pow2 <<= 1;
1146         }
1147
1148         /* Load first line with zero (therefore invalid) tag. */
1149         write_c0_taglo(0);
1150         write_c0_taghi(0);
1151         __asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
1152         cache_op(Index_Store_Tag_I, begin);
1153         cache_op(Index_Store_Tag_D, begin);
1154         cache_op(Index_Store_Tag_SD, begin);
1155
1156         /* Now search for the wrap around point. */
1157         pow2 = (128 * 1024);
1158         for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) {
1159                 cache_op(Index_Load_Tag_SD, addr);
1160                 __asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
1161                 if (!read_c0_taglo())
1162                         break;
1163                 pow2 <<= 1;
1164         }
1165         local_irq_restore(flags);
1166         addr -= begin;
1167
1168         scache_size = addr;
1169         c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22);
1170         c->scache.ways = 1;
1171         c->dcache.waybit = 0;           /* does not matter */
1172
1173         return 1;
1174 }
1175
1176 #if defined(CONFIG_CPU_LOONGSON2)
1177 static void __init loongson2_sc_init(void)
1178 {
1179         struct cpuinfo_mips *c = &current_cpu_data;
1180
1181         scache_size = 512*1024;
1182         c->scache.linesz = 32;
1183         c->scache.ways = 4;
1184         c->scache.waybit = 0;
1185         c->scache.waysize = scache_size / (c->scache.ways);
1186         c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1187         pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1188                scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1189
1190         c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1191 }
1192 #endif
1193
1194 extern int r5k_sc_init(void);
1195 extern int rm7k_sc_init(void);
1196 extern int mips_sc_init(void);
1197
1198 static void __cpuinit setup_scache(void)
1199 {
1200         struct cpuinfo_mips *c = &current_cpu_data;
1201         unsigned int config = read_c0_config();
1202         int sc_present = 0;
1203
1204         /*
1205          * Do the probing thing on R4000SC and R4400SC processors.  Other
1206          * processors don't have a S-cache that would be relevant to the
1207          * Linux memory management.
1208          */
1209         switch (c->cputype) {
1210         case CPU_R4000SC:
1211         case CPU_R4000MC:
1212         case CPU_R4400SC:
1213         case CPU_R4400MC:
1214                 sc_present = run_uncached(probe_scache);
1215                 if (sc_present)
1216                         c->options |= MIPS_CPU_CACHE_CDEX_S;
1217                 break;
1218
1219         case CPU_R10000:
1220         case CPU_R12000:
1221         case CPU_R14000:
1222                 scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16);
1223                 c->scache.linesz = 64 << ((config >> 13) & 1);
1224                 c->scache.ways = 2;
1225                 c->scache.waybit= 0;
1226                 sc_present = 1;
1227                 break;
1228
1229         case CPU_R5000:
1230         case CPU_NEVADA:
1231 #ifdef CONFIG_R5000_CPU_SCACHE
1232                 r5k_sc_init();
1233 #endif
1234                 return;
1235
1236         case CPU_RM7000:
1237 #ifdef CONFIG_RM7000_CPU_SCACHE
1238                 rm7k_sc_init();
1239 #endif
1240                 return;
1241
1242 #if defined(CONFIG_CPU_LOONGSON2)
1243         case CPU_LOONGSON2:
1244                 loongson2_sc_init();
1245                 return;
1246 #endif
1247         case CPU_XLP:
1248                 /* don't need to worry about L2, fully coherent */
1249                 return;
1250
1251         default:
1252                 if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M32R2 |
1253                                     MIPS_CPU_ISA_M64R1 | MIPS_CPU_ISA_M64R2)) {
1254 #ifdef CONFIG_MIPS_CPU_SCACHE
1255                         if (mips_sc_init ()) {
1256                                 scache_size = c->scache.ways * c->scache.sets * c->scache.linesz;
1257                                 printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n",
1258                                        scache_size >> 10,
1259                                        way_string[c->scache.ways], c->scache.linesz);
1260                         }
1261 #else
1262                         if (!(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
1263                                 panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
1264 #endif
1265                         return;
1266                 }
1267                 sc_present = 0;
1268         }
1269
1270         if (!sc_present)
1271                 return;
1272
1273         /* compute a couple of other cache variables */
1274         c->scache.waysize = scache_size / c->scache.ways;
1275
1276         c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1277
1278         printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1279                scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1280
1281         c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1282 }
1283
1284 void au1x00_fixup_config_od(void)
1285 {
1286         /*
1287          * c0_config.od (bit 19) was write only (and read as 0)
1288          * on the early revisions of Alchemy SOCs.  It disables the bus
1289          * transaction overlapping and needs to be set to fix various errata.
1290          */
1291         switch (read_c0_prid()) {
1292         case 0x00030100: /* Au1000 DA */
1293         case 0x00030201: /* Au1000 HA */
1294         case 0x00030202: /* Au1000 HB */
1295         case 0x01030200: /* Au1500 AB */
1296         /*
1297          * Au1100 errata actually keeps silence about this bit, so we set it
1298          * just in case for those revisions that require it to be set according
1299          * to the (now gone) cpu table.
1300          */
1301         case 0x02030200: /* Au1100 AB */
1302         case 0x02030201: /* Au1100 BA */
1303         case 0x02030202: /* Au1100 BC */
1304                 set_c0_config(1 << 19);
1305                 break;
1306         }
1307 }
1308
1309 /* CP0 hazard avoidance. */
1310 #define NXP_BARRIER()                                                   \
1311          __asm__ __volatile__(                                          \
1312         ".set noreorder\n\t"                                            \
1313         "nop; nop; nop; nop; nop; nop;\n\t"                             \
1314         ".set reorder\n\t")
1315
1316 static void nxp_pr4450_fixup_config(void)
1317 {
1318         unsigned long config0;
1319
1320         config0 = read_c0_config();
1321
1322         /* clear all three cache coherency fields */
1323         config0 &= ~(0x7 | (7 << 25) | (7 << 28));
1324         config0 |= (((_page_cachable_default >> _CACHE_SHIFT) <<  0) |
1325                     ((_page_cachable_default >> _CACHE_SHIFT) << 25) |
1326                     ((_page_cachable_default >> _CACHE_SHIFT) << 28));
1327         write_c0_config(config0);
1328         NXP_BARRIER();
1329 }
1330
1331 static int __cpuinitdata cca = -1;
1332
1333 static int __init cca_setup(char *str)
1334 {
1335         get_option(&str, &cca);
1336
1337         return 0;
1338 }
1339
1340 early_param("cca", cca_setup);
1341
1342 static void __cpuinit coherency_setup(void)
1343 {
1344         if (cca < 0 || cca > 7)
1345                 cca = read_c0_config() & CONF_CM_CMASK;
1346         _page_cachable_default = cca << _CACHE_SHIFT;
1347
1348         pr_debug("Using cache attribute %d\n", cca);
1349         change_c0_config(CONF_CM_CMASK, cca);
1350
1351         /*
1352          * c0_status.cu=0 specifies that updates by the sc instruction use
1353          * the coherency mode specified by the TLB; 1 means cachable
1354          * coherent update on write will be used.  Not all processors have
1355          * this bit and; some wire it to zero, others like Toshiba had the
1356          * silly idea of putting something else there ...
1357          */
1358         switch (current_cpu_type()) {
1359         case CPU_R4000PC:
1360         case CPU_R4000SC:
1361         case CPU_R4000MC:
1362         case CPU_R4400PC:
1363         case CPU_R4400SC:
1364         case CPU_R4400MC:
1365                 clear_c0_config(CONF_CU);
1366                 break;
1367         /*
1368          * We need to catch the early Alchemy SOCs with
1369          * the write-only co_config.od bit and set it back to one on:
1370          * Au1000 rev DA, HA, HB;  Au1100 AB, BA, BC, Au1500 AB
1371          */
1372         case CPU_ALCHEMY:
1373                 au1x00_fixup_config_od();
1374                 break;
1375
1376         case PRID_IMP_PR4450:
1377                 nxp_pr4450_fixup_config();
1378                 break;
1379         }
1380 }
1381
1382 #if defined(CONFIG_DMA_NONCOHERENT)
1383
1384 static int __cpuinitdata coherentio;
1385
1386 static int __init setcoherentio(char *str)
1387 {
1388         coherentio = 1;
1389
1390         return 0;
1391 }
1392
1393 early_param("coherentio", setcoherentio);
1394 #endif
1395
1396 static void __cpuinit r4k_cache_error_setup(void)
1397 {
1398         extern char __weak except_vec2_generic;
1399         extern char __weak except_vec2_sb1;
1400         struct cpuinfo_mips *c = &current_cpu_data;
1401
1402         switch (c->cputype) {
1403         case CPU_SB1:
1404         case CPU_SB1A:
1405                 set_uncached_handler(0x100, &except_vec2_sb1, 0x80);
1406                 break;
1407
1408         default:
1409                 set_uncached_handler(0x100, &except_vec2_generic, 0x80);
1410                 break;
1411         }
1412 }
1413
1414 void __cpuinit r4k_cache_init(void)
1415 {
1416         extern void build_clear_page(void);
1417         extern void build_copy_page(void);
1418         struct cpuinfo_mips *c = &current_cpu_data;
1419
1420         probe_pcache();
1421         setup_scache();
1422
1423         r4k_blast_dcache_page_setup();
1424         r4k_blast_dcache_page_indexed_setup();
1425         r4k_blast_dcache_setup();
1426         r4k_blast_icache_page_setup();
1427         r4k_blast_icache_page_indexed_setup();
1428         r4k_blast_icache_setup();
1429         r4k_blast_scache_page_setup();
1430         r4k_blast_scache_page_indexed_setup();
1431         r4k_blast_scache_setup();
1432
1433         /*
1434          * Some MIPS32 and MIPS64 processors have physically indexed caches.
1435          * This code supports virtually indexed processors and will be
1436          * unnecessarily inefficient on physically indexed processors.
1437          */
1438         if (c->dcache.linesz)
1439                 shm_align_mask = max_t( unsigned long,
1440                                         c->dcache.sets * c->dcache.linesz - 1,
1441                                         PAGE_SIZE - 1);
1442         else
1443                 shm_align_mask = PAGE_SIZE-1;
1444
1445         __flush_cache_vmap      = r4k__flush_cache_vmap;
1446         __flush_cache_vunmap    = r4k__flush_cache_vunmap;
1447
1448         flush_cache_all         = cache_noop;
1449         __flush_cache_all       = r4k___flush_cache_all;
1450         flush_cache_mm          = r4k_flush_cache_mm;
1451         flush_cache_page        = r4k_flush_cache_page;
1452         flush_cache_range       = r4k_flush_cache_range;
1453
1454         __flush_kernel_vmap_range = r4k_flush_kernel_vmap_range;
1455
1456         flush_cache_sigtramp    = r4k_flush_cache_sigtramp;
1457         flush_icache_all        = r4k_flush_icache_all;
1458         local_flush_data_cache_page     = local_r4k_flush_data_cache_page;
1459         flush_data_cache_page   = r4k_flush_data_cache_page;
1460         flush_icache_range      = r4k_flush_icache_range;
1461         local_flush_icache_range        = local_r4k_flush_icache_range;
1462
1463 #if defined(CONFIG_DMA_NONCOHERENT)
1464         if (coherentio) {
1465                 _dma_cache_wback_inv    = (void *)cache_noop;
1466                 _dma_cache_wback        = (void *)cache_noop;
1467                 _dma_cache_inv          = (void *)cache_noop;
1468         } else {
1469                 _dma_cache_wback_inv    = r4k_dma_cache_wback_inv;
1470                 _dma_cache_wback        = r4k_dma_cache_wback_inv;
1471                 _dma_cache_inv          = r4k_dma_cache_inv;
1472         }
1473 #endif
1474
1475         build_clear_page();
1476         build_copy_page();
1477 #if !defined(CONFIG_MIPS_CMP)
1478         local_r4k___flush_cache_all(NULL);
1479 #endif
1480         coherency_setup();
1481         board_cache_error_setup = r4k_cache_error_setup;
1482 }