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/preempt.h>
  16 #include <linux/sched.h>
  17 #include <linux/smp.h>
  18 #include <linux/mm.h>
  19 #include <linux/module.h>
  20 #include <linux/bitops.h>
  21
  22 #include <asm/bcache.h>
  23 #include <asm/bootinfo.h>
  24 #include <asm/cache.h>
  25 #include <asm/cacheops.h>
  26 #include <asm/cpu.h>
  27 #include <asm/cpu-features.h>
  28 #include <asm/cpu-type.h>
  29 #include <asm/io.h>
  30 #include <asm/page.h>
  31 #include <asm/pgtable.h>
  32 #include <asm/r4kcache.h>
  33 #include <asm/sections.h>
  34 #include <asm/mmu_context.h>
  35 #include <asm/war.h>
  36 #include <asm/cacheflush.h> /* for run_uncached() */
  37 #include <asm/traps.h>
  38 #include <asm/dma-coherence.h>
  39
  40 /*
  41  * Special Variant of smp_call_function for use by cache functions:
  42  *
  43  *  o No return value
  44  *  o collapses to normal function call on UP kernels
  45  *  o collapses to normal function call on systems with a single shared
  46  *    primary cache.
  47  *  o doesn't disable interrupts on the local CPU
  48  */
  49 static inline void r4k_on_each_cpu(void (*func) (void *info), void *info)
  50 {
  51         preempt_disable();
  52
  53 #if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC)
  54         smp_call_function(func, info, 1);
  55 #endif
  56         func(info);
  57         preempt_enable();
  58 }
  59
  60 #if defined(CONFIG_MIPS_CMP)
  61 #define cpu_has_safe_index_cacheops 0
  62 #else
  63 #define cpu_has_safe_index_cacheops 1
  64 #endif
  65
  66 /*
  67  * Must die.
  68  */
  69 static unsigned long icache_size __read_mostly;
  70 static unsigned long dcache_size __read_mostly;
  71 static unsigned long scache_size __read_mostly;
  72
  73 /*
  74  * Dummy cache handling routines for machines without boardcaches
  75  */
  76 static void cache_noop(void) {}
  77
  78 static struct bcache_ops no_sc_ops = {
  79         .bc_enable = (void *)cache_noop,
  80         .bc_disable = (void *)cache_noop,
  81         .bc_wback_inv = (void *)cache_noop,
  82         .bc_inv = (void *)cache_noop
  83 };
  84
  85 struct bcache_ops *bcops = &no_sc_ops;
  86
  87 #define cpu_is_r4600_v1_x()     ((read_c0_prid() & 0xfffffff0) == 0x00002010)
  88 #define cpu_is_r4600_v2_x()     ((read_c0_prid() & 0xfffffff0) == 0x00002020)
  89
  90 #define R4600_HIT_CACHEOP_WAR_IMPL                                      \
  91 do {                                                                    \
  92         if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x())            \
  93                 *(volatile unsigned long *)CKSEG1;                      \
  94         if (R4600_V1_HIT_CACHEOP_WAR)                                   \
  95                 __asm__ __volatile__("nop;nop;nop;nop");                \
  96 } while (0)
  97
  98 static void (*r4k_blast_dcache_page)(unsigned long addr);
  99
 100 static inline void r4k_blast_dcache_page_dc32(unsigned long addr)
 101 {
 102         R4600_HIT_CACHEOP_WAR_IMPL;
 103         blast_dcache32_page(addr);
 104 }
 105
 106 static inline void r4k_blast_dcache_page_dc64(unsigned long addr)
 107 {
 108         R4600_HIT_CACHEOP_WAR_IMPL;
 109         blast_dcache64_page(addr);
 110 }
 111
 112 static void r4k_blast_dcache_page_setup(void)
 113 {
 114         unsigned long  dc_lsize = cpu_dcache_line_size();
 115
 116         if (dc_lsize == 0)
 117                 r4k_blast_dcache_page = (void *)cache_noop;
 118         else if (dc_lsize == 16)
 119                 r4k_blast_dcache_page = blast_dcache16_page;
 120         else if (dc_lsize == 32)
 121                 r4k_blast_dcache_page = r4k_blast_dcache_page_dc32;
 122         else if (dc_lsize == 64)
 123                 r4k_blast_dcache_page = r4k_blast_dcache_page_dc64;
 124 }
 125
 126 static void (* r4k_blast_dcache_page_indexed)(unsigned long addr);
 127
 128 static void r4k_blast_dcache_page_indexed_setup(void)
 129 {
 130         unsigned long dc_lsize = cpu_dcache_line_size();
 131
 132         if (dc_lsize == 0)
 133                 r4k_blast_dcache_page_indexed = (void *)cache_noop;
 134         else if (dc_lsize == 16)
 135                 r4k_blast_dcache_page_indexed = blast_dcache16_page_indexed;
 136         else if (dc_lsize == 32)
 137                 r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed;
 138         else if (dc_lsize == 64)
 139                 r4k_blast_dcache_page_indexed = blast_dcache64_page_indexed;
 140 }
 141
 142 void (* r4k_blast_dcache)(void);
 143 EXPORT_SYMBOL(r4k_blast_dcache);
 144
 145 static void r4k_blast_dcache_setup(void)
 146 {
 147         unsigned long dc_lsize = cpu_dcache_line_size();
 148
 149         if (dc_lsize == 0)
 150                 r4k_blast_dcache = (void *)cache_noop;
 151         else if (dc_lsize == 16)
 152                 r4k_blast_dcache = blast_dcache16;
 153         else if (dc_lsize == 32)
 154                 r4k_blast_dcache = blast_dcache32;
 155         else if (dc_lsize == 64)
 156                 r4k_blast_dcache = blast_dcache64;
 157 }
 158
 159 /* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
 160 #define JUMP_TO_ALIGN(order) \
 161         __asm__ __volatile__( \
 162                 "b\t1f\n\t" \
 163                 ".align\t" #order "\n\t" \
 164                 "1:\n\t" \
 165                 )
 166 #define CACHE32_UNROLL32_ALIGN  JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
 167 #define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
 168
 169 static inline void blast_r4600_v1_icache32(void)
 170 {
 171         unsigned long flags;
 172
 173         local_irq_save(flags);
 174         blast_icache32();
 175         local_irq_restore(flags);
 176 }
 177
 178 static inline void tx49_blast_icache32(void)
 179 {
 180         unsigned long start = INDEX_BASE;
 181         unsigned long end = start + current_cpu_data.icache.waysize;
 182         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 183         unsigned long ws_end = current_cpu_data.icache.ways <<
 184                                current_cpu_data.icache.waybit;
 185         unsigned long ws, addr;
 186
 187         CACHE32_UNROLL32_ALIGN2;
 188         /* I'm in even chunk.  blast odd chunks */
 189         for (ws = 0; ws < ws_end; ws += ws_inc)
 190                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 191                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 192         CACHE32_UNROLL32_ALIGN;
 193         /* I'm in odd chunk.  blast even chunks */
 194         for (ws = 0; ws < ws_end; ws += ws_inc)
 195                 for (addr = start; addr < end; addr += 0x400 * 2)
 196                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 197 }
 198
 199 static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page)
 200 {
 201         unsigned long flags;
 202
 203         local_irq_save(flags);
 204         blast_icache32_page_indexed(page);
 205         local_irq_restore(flags);
 206 }
 207
 208 static inline void tx49_blast_icache32_page_indexed(unsigned long page)
 209 {
 210         unsigned long indexmask = current_cpu_data.icache.waysize - 1;
 211         unsigned long start = INDEX_BASE + (page & indexmask);
 212         unsigned long end = start + PAGE_SIZE;
 213         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 214         unsigned long ws_end = current_cpu_data.icache.ways <<
 215                                current_cpu_data.icache.waybit;
 216         unsigned long ws, addr;
 217
 218         CACHE32_UNROLL32_ALIGN2;
 219         /* I'm in even chunk.  blast odd chunks */
 220         for (ws = 0; ws < ws_end; ws += ws_inc)
 221                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 222                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 223         CACHE32_UNROLL32_ALIGN;
 224         /* I'm in odd chunk.  blast even chunks */
 225         for (ws = 0; ws < ws_end; ws += ws_inc)
 226                 for (addr = start; addr < end; addr += 0x400 * 2)
 227                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 228 }
 229
 230 static void (* r4k_blast_icache_page)(unsigned long addr);
 231
 232 static void r4k_blast_icache_page_setup(void)
 233 {
 234         unsigned long ic_lsize = cpu_icache_line_size();
 235
 236         if (ic_lsize == 0)
 237                 r4k_blast_icache_page = (void *)cache_noop;
 238         else if (ic_lsize == 16)
 239                 r4k_blast_icache_page = blast_icache16_page;
 240         else if (ic_lsize == 32)
 241                 r4k_blast_icache_page = blast_icache32_page;
 242         else if (ic_lsize == 64)
 243                 r4k_blast_icache_page = blast_icache64_page;
 244 }
 245
 246
 247 static void (* r4k_blast_icache_page_indexed)(unsigned long addr);
 248
 249 static void r4k_blast_icache_page_indexed_setup(void)
 250 {
 251         unsigned long ic_lsize = cpu_icache_line_size();
 252
 253         if (ic_lsize == 0)
 254                 r4k_blast_icache_page_indexed = (void *)cache_noop;
 255         else if (ic_lsize == 16)
 256                 r4k_blast_icache_page_indexed = blast_icache16_page_indexed;
 257         else if (ic_lsize == 32) {
 258                 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
 259                         r4k_blast_icache_page_indexed =
 260                                 blast_icache32_r4600_v1_page_indexed;
 261                 else if (TX49XX_ICACHE_INDEX_INV_WAR)
 262                         r4k_blast_icache_page_indexed =
 263                                 tx49_blast_icache32_page_indexed;
 264                 else
 265                         r4k_blast_icache_page_indexed =
 266                                 blast_icache32_page_indexed;
 267         } else if (ic_lsize == 64)
 268                 r4k_blast_icache_page_indexed = blast_icache64_page_indexed;
 269 }
 270
 271 void (* r4k_blast_icache)(void);
 272 EXPORT_SYMBOL(r4k_blast_icache);
 273
 274 static void r4k_blast_icache_setup(void)
 275 {
 276         unsigned long ic_lsize = cpu_icache_line_size();
 277
 278         if (ic_lsize == 0)
 279                 r4k_blast_icache = (void *)cache_noop;
 280         else if (ic_lsize == 16)
 281                 r4k_blast_icache = blast_icache16;
 282         else if (ic_lsize == 32) {
 283                 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
 284                         r4k_blast_icache = blast_r4600_v1_icache32;
 285                 else if (TX49XX_ICACHE_INDEX_INV_WAR)
 286                         r4k_blast_icache = tx49_blast_icache32;
 287                 else
 288                         r4k_blast_icache = blast_icache32;
 289         } else if (ic_lsize == 64)
 290                 r4k_blast_icache = blast_icache64;
 291 }
 292
 293 static void (* r4k_blast_scache_page)(unsigned long addr);
 294
 295 static void r4k_blast_scache_page_setup(void)
 296 {
 297         unsigned long sc_lsize = cpu_scache_line_size();
 298
 299         if (scache_size == 0)
 300                 r4k_blast_scache_page = (void *)cache_noop;
 301         else if (sc_lsize == 16)
 302                 r4k_blast_scache_page = blast_scache16_page;
 303         else if (sc_lsize == 32)
 304                 r4k_blast_scache_page = blast_scache32_page;
 305         else if (sc_lsize == 64)
 306                 r4k_blast_scache_page = blast_scache64_page;
 307         else if (sc_lsize == 128)
 308                 r4k_blast_scache_page = blast_scache128_page;
 309 }
 310
 311 static void (* r4k_blast_scache_page_indexed)(unsigned long addr);
 312
 313 static void r4k_blast_scache_page_indexed_setup(void)
 314 {
 315         unsigned long sc_lsize = cpu_scache_line_size();
 316
 317         if (scache_size == 0)
 318                 r4k_blast_scache_page_indexed = (void *)cache_noop;
 319         else if (sc_lsize == 16)
 320                 r4k_blast_scache_page_indexed = blast_scache16_page_indexed;
 321         else if (sc_lsize == 32)
 322                 r4k_blast_scache_page_indexed = blast_scache32_page_indexed;
 323         else if (sc_lsize == 64)
 324                 r4k_blast_scache_page_indexed = blast_scache64_page_indexed;
 325         else if (sc_lsize == 128)
 326                 r4k_blast_scache_page_indexed = blast_scache128_page_indexed;
 327 }
 328
 329 static void (* r4k_blast_scache)(void);
 330
 331 static void r4k_blast_scache_setup(void)
 332 {
 333         unsigned long sc_lsize = cpu_scache_line_size();
 334
 335         if (scache_size == 0)
 336                 r4k_blast_scache = (void *)cache_noop;
 337         else if (sc_lsize == 16)
 338                 r4k_blast_scache = blast_scache16;
 339         else if (sc_lsize == 32)
 340                 r4k_blast_scache = blast_scache32;
 341         else if (sc_lsize == 64)
 342                 r4k_blast_scache = blast_scache64;
 343         else if (sc_lsize == 128)
 344                 r4k_blast_scache = blast_scache128;
 345 }
 346
 347 static inline void local_r4k___flush_cache_all(void * args)
 348 {
 349 #if defined(CONFIG_CPU_LOONGSON2)
 350         r4k_blast_scache();
 351         return;
 352 #endif
 353         r4k_blast_dcache();
 354         r4k_blast_icache();
 355
 356         switch (current_cpu_type()) {
 357         case CPU_R4000SC:
 358         case CPU_R4000MC:
 359         case CPU_R4400SC:
 360         case CPU_R4400MC:
 361         case CPU_R10000:
 362         case CPU_R12000:
 363         case CPU_R14000:
 364                 r4k_blast_scache();
 365         }
 366 }
 367
 368 static void r4k___flush_cache_all(void)
 369 {
 370         r4k_on_each_cpu(local_r4k___flush_cache_all, NULL);
 371 }
 372
 373 static inline int has_valid_asid(const struct mm_struct *mm)
 374 {
 375 #if defined(CONFIG_MIPS_MT_SMP) || defined(CONFIG_MIPS_MT_SMTC)
 376         int i;
 377
 378         for_each_online_cpu(i)
 379                 if (cpu_context(i, mm))
 380                         return 1;
 381
 382         return 0;
 383 #else
 384         return cpu_context(smp_processor_id(), mm);
 385 #endif
 386 }
 387
 388 static void r4k__flush_cache_vmap(void)
 389 {
 390         r4k_blast_dcache();
 391 }
 392
 393 static void r4k__flush_cache_vunmap(void)
 394 {
 395         r4k_blast_dcache();
 396 }
 397
 398 static inline void local_r4k_flush_cache_range(void * args)
 399 {
 400         struct vm_area_struct *vma = args;
 401         int exec = vma->vm_flags & VM_EXEC;
 402
 403         if (!(has_valid_asid(vma->vm_mm)))
 404                 return;
 405
 406         r4k_blast_dcache();
 407         if (exec)
 408                 r4k_blast_icache();
 409 }
 410
 411 static void r4k_flush_cache_range(struct vm_area_struct *vma,
 412         unsigned long start, unsigned long end)
 413 {
 414         int exec = vma->vm_flags & VM_EXEC;
 415
 416         if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc))
 417                 r4k_on_each_cpu(local_r4k_flush_cache_range, vma);
 418 }
 419
 420 static inline void local_r4k_flush_cache_mm(void * args)
 421 {
 422         struct mm_struct *mm = args;
 423
 424         if (!has_valid_asid(mm))
 425                 return;
 426
 427         /*
 428          * Kludge alert.  For obscure reasons R4000SC and R4400SC go nuts if we
 429          * only flush the primary caches but R10000 and R12000 behave sane ...
 430          * R4000SC and R4400SC indexed S-cache ops also invalidate primary
 431          * caches, so we can bail out early.
 432          */
 433         if (current_cpu_type() == CPU_R4000SC ||
 434             current_cpu_type() == CPU_R4000MC ||
 435             current_cpu_type() == CPU_R4400SC ||
 436             current_cpu_type() == CPU_R4400MC) {
 437                 r4k_blast_scache();
 438                 return;
 439         }
 440
 441         r4k_blast_dcache();
 442 }
 443
 444 static void r4k_flush_cache_mm(struct mm_struct *mm)
 445 {
 446         if (!cpu_has_dc_aliases)
 447                 return;
 448
 449         r4k_on_each_cpu(local_r4k_flush_cache_mm, mm);
 450 }
 451
 452 struct flush_cache_page_args {
 453         struct vm_area_struct *vma;
 454         unsigned long addr;
 455         unsigned long pfn;
 456 };
 457
 458 static inline void local_r4k_flush_cache_page(void *args)
 459 {
 460         struct flush_cache_page_args *fcp_args = args;
 461         struct vm_area_struct *vma = fcp_args->vma;
 462         unsigned long addr = fcp_args->addr;
 463         struct page *page = pfn_to_page(fcp_args->pfn);
 464         int exec = vma->vm_flags & VM_EXEC;
 465         struct mm_struct *mm = vma->vm_mm;
 466         int map_coherent = 0;
 467         pgd_t *pgdp;
 468         pud_t *pudp;
 469         pmd_t *pmdp;
 470         pte_t *ptep;
 471         void *vaddr;
 472
 473         /*
 474          * If ownes no valid ASID yet, cannot possibly have gotten
 475          * this page into the cache.
 476          */
 477         if (!has_valid_asid(mm))
 478                 return;
 479
 480         addr &= PAGE_MASK;
 481         pgdp = pgd_offset(mm, addr);
 482         pudp = pud_offset(pgdp, addr);
 483         pmdp = pmd_offset(pudp, addr);
 484         ptep = pte_offset(pmdp, addr);
 485
 486         /*
 487          * If the page isn't marked valid, the page cannot possibly be
 488          * in the cache.
 489          */
 490         if (!(pte_present(*ptep)))
 491                 return;
 492
 493         if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID))
 494                 vaddr = NULL;
 495         else {
 496                 /*
 497                  * Use kmap_coherent or kmap_atomic to do flushes for
 498                  * another ASID than the current one.
 499                  */
 500                 map_coherent = (cpu_has_dc_aliases &&
 501                                 page_mapped(page) && !Page_dcache_dirty(page));
 502                 if (map_coherent)
 503                         vaddr = kmap_coherent(page, addr);
 504                 else
 505                         vaddr = kmap_atomic(page);
 506                 addr = (unsigned long)vaddr;
 507         }
 508
 509         if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
 510                 r4k_blast_dcache_page(addr);
 511                 if (exec && !cpu_icache_snoops_remote_store)
 512                         r4k_blast_scache_page(addr);
 513         }
 514         if (exec) {
 515                 if (vaddr && cpu_has_vtag_icache && mm == current->active_mm) {
 516                         int cpu = smp_processor_id();
 517
 518                         if (cpu_context(cpu, mm) != 0)
 519                                 drop_mmu_context(mm, cpu);
 520                 } else
 521                         r4k_blast_icache_page(addr);
 522         }
 523
 524         if (vaddr) {
 525                 if (map_coherent)
 526                         kunmap_coherent();
 527                 else
 528                         kunmap_atomic(vaddr);
 529         }
 530 }
 531
 532 static void r4k_flush_cache_page(struct vm_area_struct *vma,
 533         unsigned long addr, unsigned long pfn)
 534 {
 535         struct flush_cache_page_args args;
 536
 537         args.vma = vma;
 538         args.addr = addr;
 539         args.pfn = pfn;
 540
 541         r4k_on_each_cpu(local_r4k_flush_cache_page, &args);
 542 }
 543
 544 static inline void local_r4k_flush_data_cache_page(void * addr)
 545 {
 546         r4k_blast_dcache_page((unsigned long) addr);
 547 }
 548
 549 static void r4k_flush_data_cache_page(unsigned long addr)
 550 {
 551         if (in_atomic())
 552                 local_r4k_flush_data_cache_page((void *)addr);
 553         else
 554                 r4k_on_each_cpu(local_r4k_flush_data_cache_page, (void *) addr);
 555 }
 556
 557 struct flush_icache_range_args {
 558         unsigned long start;
 559         unsigned long end;
 560 };
 561
 562 static inline void local_r4k_flush_icache_range(unsigned long start, unsigned long end)
 563 {
 564         if (!cpu_has_ic_fills_f_dc) {
 565                 if (end - start >= dcache_size) {
 566                         r4k_blast_dcache();
 567                 } else {
 568                         R4600_HIT_CACHEOP_WAR_IMPL;
 569                         protected_blast_dcache_range(start, end);
 570                 }
 571         }
 572
 573         if (end - start > icache_size)
 574                 r4k_blast_icache();
 575         else
 576                 protected_blast_icache_range(start, end);
 577 }
 578
 579 static inline void local_r4k_flush_icache_range_ipi(void *args)
 580 {
 581         struct flush_icache_range_args *fir_args = args;
 582         unsigned long start = fir_args->start;
 583         unsigned long end = fir_args->end;
 584
 585         local_r4k_flush_icache_range(start, end);
 586 }
 587
 588 static void r4k_flush_icache_range(unsigned long start, unsigned long end)
 589 {
 590         struct flush_icache_range_args args;
 591
 592         args.start = start;
 593         args.end = end;
 594
 595         r4k_on_each_cpu(local_r4k_flush_icache_range_ipi, &args);
 596         instruction_hazard();
 597 }
 598
 599 #ifdef CONFIG_DMA_NONCOHERENT
 600
 601 static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
 602 {
 603         /* Catch bad driver code */
 604         BUG_ON(size == 0);
 605
 606         preempt_disable();
 607         if (cpu_has_inclusive_pcaches) {
 608                 if (size >= scache_size)
 609                         r4k_blast_scache();
 610                 else
 611                         blast_scache_range(addr, addr + size);
 612                 preempt_enable();
 613                 __sync();
 614                 return;
 615         }
 616
 617         /*
 618          * Either no secondary cache or the available caches don't have the
 619          * subset property so we have to flush the primary caches
 620          * explicitly
 621          */
 622         if (cpu_has_safe_index_cacheops && size >= dcache_size) {
 623                 r4k_blast_dcache();
 624         } else {
 625                 R4600_HIT_CACHEOP_WAR_IMPL;
 626                 blast_dcache_range(addr, addr + size);
 627         }
 628         preempt_enable();
 629
 630         bc_wback_inv(addr, size);
 631         __sync();
 632 }
 633
 634 static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
 635 {
 636         /* Catch bad driver code */
 637         BUG_ON(size == 0);
 638
 639         preempt_disable();
 640         if (cpu_has_inclusive_pcaches) {
 641                 if (size >= scache_size)
 642                         r4k_blast_scache();
 643                 else {
 644                         /*
 645                          * There is no clearly documented alignment requirement
 646                          * for the cache instruction on MIPS processors and
 647                          * some processors, among them the RM5200 and RM7000
 648                          * QED processors will throw an address error for cache
 649                          * hit ops with insufficient alignment.  Solved by
 650                          * aligning the address to cache line size.
 651                          */
 652                         blast_inv_scache_range(addr, addr + size);
 653                 }
 654                 preempt_enable();
 655                 __sync();
 656                 return;
 657         }
 658
 659         if (cpu_has_safe_index_cacheops && size >= dcache_size) {
 660                 r4k_blast_dcache();
 661         } else {
 662                 R4600_HIT_CACHEOP_WAR_IMPL;
 663                 blast_inv_dcache_range(addr, addr + size);
 664         }
 665         preempt_enable();
 666
 667         bc_inv(addr, size);
 668         __sync();
 669 }
 670 #endif /* CONFIG_DMA_NONCOHERENT */
 671
 672 /*
 673  * While we're protected against bad userland addresses we don't care
 674  * very much about what happens in that case.  Usually a segmentation
 675  * fault will dump the process later on anyway ...
 676  */
 677 static void local_r4k_flush_cache_sigtramp(void * arg)
 678 {
 679         unsigned long ic_lsize = cpu_icache_line_size();
 680         unsigned long dc_lsize = cpu_dcache_line_size();
 681         unsigned long sc_lsize = cpu_scache_line_size();
 682         unsigned long addr = (unsigned long) arg;
 683
 684         R4600_HIT_CACHEOP_WAR_IMPL;
 685         if (dc_lsize)
 686                 protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
 687         if (!cpu_icache_snoops_remote_store && scache_size)
 688                 protected_writeback_scache_line(addr & ~(sc_lsize - 1));
 689         if (ic_lsize)
 690                 protected_flush_icache_line(addr & ~(ic_lsize - 1));
 691         if (MIPS4K_ICACHE_REFILL_WAR) {
 692                 __asm__ __volatile__ (
 693                         ".set push\n\t"
 694                         ".set noat\n\t"
 695                         ".set mips3\n\t"
 696 #ifdef CONFIG_32BIT
 697                         "la     $at,1f\n\t"
 698 #endif
 699 #ifdef CONFIG_64BIT
 700                         "dla    $at,1f\n\t"
 701 #endif
 702                         "cache  %0,($at)\n\t"
 703                         "nop; nop; nop\n"
 704                         "1:\n\t"
 705                         ".set pop"
 706                         :
 707                         : "i" (Hit_Invalidate_I));
 708         }
 709         if (MIPS_CACHE_SYNC_WAR)
 710                 __asm__ __volatile__ ("sync");
 711 }
 712
 713 static void r4k_flush_cache_sigtramp(unsigned long addr)
 714 {
 715         r4k_on_each_cpu(local_r4k_flush_cache_sigtramp, (void *) addr);
 716 }
 717
 718 static void r4k_flush_icache_all(void)
 719 {
 720         if (cpu_has_vtag_icache)
 721                 r4k_blast_icache();
 722 }
 723
 724 struct flush_kernel_vmap_range_args {
 725         unsigned long   vaddr;
 726         int             size;
 727 };
 728
 729 static inline void local_r4k_flush_kernel_vmap_range(void *args)
 730 {
 731         struct flush_kernel_vmap_range_args *vmra = args;
 732         unsigned long vaddr = vmra->vaddr;
 733         int size = vmra->size;
 734
 735         /*
 736          * Aliases only affect the primary caches so don't bother with
 737          * S-caches or T-caches.
 738          */
 739         if (cpu_has_safe_index_cacheops && size >= dcache_size)
 740                 r4k_blast_dcache();
 741         else {
 742                 R4600_HIT_CACHEOP_WAR_IMPL;
 743                 blast_dcache_range(vaddr, vaddr + size);
 744         }
 745 }
 746
 747 static void r4k_flush_kernel_vmap_range(unsigned long vaddr, int size)
 748 {
 749         struct flush_kernel_vmap_range_args args;
 750
 751         args.vaddr = (unsigned long) vaddr;
 752         args.size = size;
 753
 754         r4k_on_each_cpu(local_r4k_flush_kernel_vmap_range, &args);
 755 }
 756
 757 static inline void rm7k_erratum31(void)
 758 {
 759         const unsigned long ic_lsize = 32;
 760         unsigned long addr;
 761
 762         /* RM7000 erratum #31. The icache is screwed at startup. */
 763         write_c0_taglo(0);
 764         write_c0_taghi(0);
 765
 766         for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) {
 767                 __asm__ __volatile__ (
 768                         ".set push\n\t"
 769                         ".set noreorder\n\t"
 770                         ".set mips3\n\t"
 771                         "cache\t%1, 0(%0)\n\t"
 772                         "cache\t%1, 0x1000(%0)\n\t"
 773                         "cache\t%1, 0x2000(%0)\n\t"
 774                         "cache\t%1, 0x3000(%0)\n\t"
 775                         "cache\t%2, 0(%0)\n\t"
 776                         "cache\t%2, 0x1000(%0)\n\t"
 777                         "cache\t%2, 0x2000(%0)\n\t"
 778                         "cache\t%2, 0x3000(%0)\n\t"
 779                         "cache\t%1, 0(%0)\n\t"
 780                         "cache\t%1, 0x1000(%0)\n\t"
 781                         "cache\t%1, 0x2000(%0)\n\t"
 782                         "cache\t%1, 0x3000(%0)\n\t"
 783                         ".set pop\n"
 784                         :
 785                         : "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill));
 786         }
 787 }
 788
 789 static inline void alias_74k_erratum(struct cpuinfo_mips *c)
 790 {
 791         unsigned int imp = c->processor_id & PRID_IMP_MASK;
 792         unsigned int rev = c->processor_id & PRID_REV_MASK;
 793
 794         /*
 795          * Early versions of the 74K do not update the cache tags on a
 796          * vtag miss/ptag hit which can occur in the case of KSEG0/KUSEG
 797          * aliases. In this case it is better to treat the cache as always
 798          * having aliases.
 799          */
 800         switch (imp) {
 801         case PRID_IMP_74K:
 802                 if (rev <= PRID_REV_ENCODE_332(2, 4, 0))
 803                         c->dcache.flags |= MIPS_CACHE_VTAG;
 804                 if (rev == PRID_REV_ENCODE_332(2, 4, 0))
 805                         write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND);
 806                 break;
 807         case PRID_IMP_1074K:
 808                 if (rev <= PRID_REV_ENCODE_332(1, 1, 0)) {
 809                         c->dcache.flags |= MIPS_CACHE_VTAG;
 810                         write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND);
 811                 }
 812                 break;
 813         default:
 814                 BUG();
 815         }
 816 }
 817
 818 static char *way_string[] = { NULL, "direct mapped", "2-way",
 819         "3-way", "4-way", "5-way", "6-way", "7-way", "8-way"
 820 };
 821
 822 static void probe_pcache(void)
 823 {
 824         struct cpuinfo_mips *c = &current_cpu_data;
 825         unsigned int config = read_c0_config();
 826         unsigned int prid = read_c0_prid();
 827         unsigned long config1;
 828         unsigned int lsize;
 829
 830         switch (current_cpu_type()) {
 831         case CPU_R4600:                 /* QED style two way caches? */
 832         case CPU_R4700:
 833         case CPU_R5000:
 834         case CPU_NEVADA:
 835                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 836                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 837                 c->icache.ways = 2;
 838                 c->icache.waybit = __ffs(icache_size/2);
 839
 840                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 841                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 842                 c->dcache.ways = 2;
 843                 c->dcache.waybit= __ffs(dcache_size/2);
 844
 845                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 846                 break;
 847
 848         case CPU_R5432:
 849         case CPU_R5500:
 850                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 851                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 852                 c->icache.ways = 2;
 853                 c->icache.waybit= 0;
 854
 855                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 856                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 857                 c->dcache.ways = 2;
 858                 c->dcache.waybit = 0;
 859
 860                 c->options |= MIPS_CPU_CACHE_CDEX_P | MIPS_CPU_PREFETCH;
 861                 break;
 862
 863         case CPU_TX49XX:
 864                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 865                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 866                 c->icache.ways = 4;
 867                 c->icache.waybit= 0;
 868
 869                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 870                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 871                 c->dcache.ways = 4;
 872                 c->dcache.waybit = 0;
 873
 874                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 875                 c->options |= MIPS_CPU_PREFETCH;
 876                 break;
 877
 878         case CPU_R4000PC:
 879         case CPU_R4000SC:
 880         case CPU_R4000MC:
 881         case CPU_R4400PC:
 882         case CPU_R4400SC:
 883         case CPU_R4400MC:
 884         case CPU_R4300:
 885                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 886                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 887                 c->icache.ways = 1;
 888                 c->icache.waybit = 0;   /* doesn't matter */
 889
 890                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 891                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 892                 c->dcache.ways = 1;
 893                 c->dcache.waybit = 0;   /* does not matter */
 894
 895                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 896                 break;
 897
 898         case CPU_R10000:
 899         case CPU_R12000:
 900         case CPU_R14000:
 901                 icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29));
 902                 c->icache.linesz = 64;
 903                 c->icache.ways = 2;
 904                 c->icache.waybit = 0;
 905
 906                 dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26));
 907                 c->dcache.linesz = 32;
 908                 c->dcache.ways = 2;
 909                 c->dcache.waybit = 0;
 910
 911                 c->options |= MIPS_CPU_PREFETCH;
 912                 break;
 913
 914         case CPU_VR4133:
 915                 write_c0_config(config & ~VR41_CONF_P4K);
 916         case CPU_VR4131:
 917                 /* Workaround for cache instruction bug of VR4131 */
 918                 if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U ||
 919                     c->processor_id == 0x0c82U) {
 920                         config |= 0x00400000U;
 921                         if (c->processor_id == 0x0c80U)
 922                                 config |= VR41_CONF_BP;
 923                         write_c0_config(config);
 924                 } else
 925                         c->options |= MIPS_CPU_CACHE_CDEX_P;
 926
 927                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
 928                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 929                 c->icache.ways = 2;
 930                 c->icache.waybit = __ffs(icache_size/2);
 931
 932                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
 933                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 934                 c->dcache.ways = 2;
 935                 c->dcache.waybit = __ffs(dcache_size/2);
 936                 break;
 937
 938         case CPU_VR41XX:
 939         case CPU_VR4111:
 940         case CPU_VR4121:
 941         case CPU_VR4122:
 942         case CPU_VR4181:
 943         case CPU_VR4181A:
 944                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
 945                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 946                 c->icache.ways = 1;
 947                 c->icache.waybit = 0;   /* doesn't matter */
 948
 949                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
 950                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 951                 c->dcache.ways = 1;
 952                 c->dcache.waybit = 0;   /* does not matter */
 953
 954                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 955                 break;
 956
 957         case CPU_RM7000:
 958                 rm7k_erratum31();
 959
 960                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 961                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 962                 c->icache.ways = 4;
 963                 c->icache.waybit = __ffs(icache_size / c->icache.ways);
 964
 965                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 966                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 967                 c->dcache.ways = 4;
 968                 c->dcache.waybit = __ffs(dcache_size / c->dcache.ways);
 969
 970                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 971                 c->options |= MIPS_CPU_PREFETCH;
 972                 break;
 973
 974         case CPU_LOONGSON2:
 975                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 976                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 977                 if (prid & 0x3)
 978                         c->icache.ways = 4;
 979                 else
 980                         c->icache.ways = 2;
 981                 c->icache.waybit = 0;
 982
 983                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 984                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 985                 if (prid & 0x3)
 986                         c->dcache.ways = 4;
 987                 else
 988                         c->dcache.ways = 2;
 989                 c->dcache.waybit = 0;
 990                 break;
 991
 992         default:
 993                 if (!(config & MIPS_CONF_M))
 994                         panic("Don't know how to probe P-caches on this cpu.");
 995
 996                 /*
 997                  * So we seem to be a MIPS32 or MIPS64 CPU
 998                  * So let's probe the I-cache ...
 999                  */
1000                 config1 = read_c0_config1();
1001
1002                 if ((lsize = ((config1 >> 19) & 7)))
1003                         c->icache.linesz = 2 << lsize;
1004                 else
1005                         c->icache.linesz = lsize;
1006                 c->icache.sets = 32 << (((config1 >> 22) + 1) & 7);
1007                 c->icache.ways = 1 + ((config1 >> 16) & 7);
1008
1009                 icache_size = c->icache.sets *
1010                               c->icache.ways *
1011                               c->icache.linesz;
1012                 c->icache.waybit = __ffs(icache_size/c->icache.ways);
1013
1014                 if (config & 0x8)               /* VI bit */
1015                         c->icache.flags |= MIPS_CACHE_VTAG;
1016
1017                 /*
1018                  * Now probe the MIPS32 / MIPS64 data cache.
1019                  */
1020                 c->dcache.flags = 0;
1021
1022                 if ((lsize = ((config1 >> 10) & 7)))
1023                         c->dcache.linesz = 2 << lsize;
1024                 else
1025                         c->dcache.linesz= lsize;
1026                 c->dcache.sets = 32 << (((config1 >> 13) + 1) & 7);
1027                 c->dcache.ways = 1 + ((config1 >> 7) & 7);
1028
1029                 dcache_size = c->dcache.sets *
1030                               c->dcache.ways *
1031                               c->dcache.linesz;
1032                 c->dcache.waybit = __ffs(dcache_size/c->dcache.ways);
1033
1034                 c->options |= MIPS_CPU_PREFETCH;
1035                 break;
1036         }
1037
1038         /*
1039          * Processor configuration sanity check for the R4000SC erratum
1040          * #5.  With page sizes larger than 32kB there is no possibility
1041          * to get a VCE exception anymore so we don't care about this
1042          * misconfiguration.  The case is rather theoretical anyway;
1043          * presumably no vendor is shipping his hardware in the "bad"
1044          * configuration.
1045          */
1046         if ((prid & PRID_IMP_MASK) == PRID_IMP_R4000 &&
1047             (prid & PRID_REV_MASK) < PRID_REV_R4400 &&
1048             !(config & CONF_SC) && c->icache.linesz != 16 &&
1049             PAGE_SIZE <= 0x8000)
1050                 panic("Improper R4000SC processor configuration detected");
1051
1052         /* compute a couple of other cache variables */
1053         c->icache.waysize = icache_size / c->icache.ways;
1054         c->dcache.waysize = dcache_size / c->dcache.ways;
1055
1056         c->icache.sets = c->icache.linesz ?
1057                 icache_size / (c->icache.linesz * c->icache.ways) : 0;
1058         c->dcache.sets = c->dcache.linesz ?
1059                 dcache_size / (c->dcache.linesz * c->dcache.ways) : 0;
1060
1061         /*
1062          * R10000 and R12000 P-caches are odd in a positive way.  They're 32kB
1063          * 2-way virtually indexed so normally would suffer from aliases.  So
1064          * normally they'd suffer from aliases but magic in the hardware deals
1065          * with that for us so we don't need to take care ourselves.
1066          */
1067         switch (current_cpu_type()) {
1068         case CPU_20KC:
1069         case CPU_25KF:
1070         case CPU_SB1:
1071         case CPU_SB1A:
1072         case CPU_XLR:
1073                 c->dcache.flags |= MIPS_CACHE_PINDEX;
1074                 break;
1075
1076         case CPU_R10000:
1077         case CPU_R12000:
1078         case CPU_R14000:
1079                 break;
1080
1081         case CPU_M14KC:
1082         case CPU_M14KEC:
1083         case CPU_24K:
1084         case CPU_34K:
1085         case CPU_74K:
1086         case CPU_1004K:
1087                 if (current_cpu_type() == CPU_74K)
1088                         alias_74k_erratum(c);
1089                 if ((read_c0_config7() & (1 << 16))) {
1090                         /* effectively physically indexed dcache,
1091                            thus no virtual aliases. */
1092                         c->dcache.flags |= MIPS_CACHE_PINDEX;
1093                         break;
1094                 }
1095         default:
1096                 if (c->dcache.waysize > PAGE_SIZE)
1097                         c->dcache.flags |= MIPS_CACHE_ALIASES;
1098         }
1099
1100         switch (current_cpu_type()) {
1101         case CPU_20KC:
1102                 /*
1103                  * Some older 20Kc chips doesn't have the 'VI' bit in
1104                  * the config register.
1105                  */
1106                 c->icache.flags |= MIPS_CACHE_VTAG;
1107                 break;
1108
1109         case CPU_ALCHEMY:
1110                 c->icache.flags |= MIPS_CACHE_IC_F_DC;
1111                 break;
1112         }
1113
1114 #ifdef  CONFIG_CPU_LOONGSON2
1115         /*
1116          * LOONGSON2 has 4 way icache, but when using indexed cache op,
1117          * one op will act on all 4 ways
1118          */
1119         c->icache.ways = 1;
1120 #endif
1121
1122         printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
1123                icache_size >> 10,
1124                c->icache.flags & MIPS_CACHE_VTAG ? "VIVT" : "VIPT",
1125                way_string[c->icache.ways], c->icache.linesz);
1126
1127         printk("Primary data cache %ldkB, %s, %s, %s, linesize %d bytes\n",
1128                dcache_size >> 10, way_string[c->dcache.ways],
1129                (c->dcache.flags & MIPS_CACHE_PINDEX) ? "PIPT" : "VIPT",
1130                (c->dcache.flags & MIPS_CACHE_ALIASES) ?
1131                         "cache aliases" : "no aliases",
1132                c->dcache.linesz);
1133 }
1134
1135 /*
1136  * If you even _breathe_ on this function, look at the gcc output and make sure
1137  * it does not pop things on and off the stack for the cache sizing loop that
1138  * executes in KSEG1 space or else you will crash and burn badly.  You have
1139  * been warned.
1140  */
1141 static int probe_scache(void)
1142 {
1143         unsigned long flags, addr, begin, end, pow2;
1144         unsigned int config = read_c0_config();
1145         struct cpuinfo_mips *c = &current_cpu_data;
1146
1147         if (config & CONF_SC)
1148                 return 0;
1149
1150         begin = (unsigned long) &_stext;
1151         begin &= ~((4 * 1024 * 1024) - 1);
1152         end = begin + (4 * 1024 * 1024);
1153
1154         /*
1155          * This is such a bitch, you'd think they would make it easy to do
1156          * this.  Away you daemons of stupidity!
1157          */
1158         local_irq_save(flags);
1159
1160         /* Fill each size-multiple cache line with a valid tag. */
1161         pow2 = (64 * 1024);
1162         for (addr = begin; addr < end; addr = (begin + pow2)) {
1163                 unsigned long *p = (unsigned long *) addr;
1164                 __asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
1165                 pow2 <<= 1;
1166         }
1167
1168         /* Load first line with zero (therefore invalid) tag. */
1169         write_c0_taglo(0);
1170         write_c0_taghi(0);
1171         __asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
1172         cache_op(Index_Store_Tag_I, begin);
1173         cache_op(Index_Store_Tag_D, begin);
1174         cache_op(Index_Store_Tag_SD, begin);
1175
1176         /* Now search for the wrap around point. */
1177         pow2 = (128 * 1024);
1178         for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) {
1179                 cache_op(Index_Load_Tag_SD, addr);
1180                 __asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
1181                 if (!read_c0_taglo())
1182                         break;
1183                 pow2 <<= 1;
1184         }
1185         local_irq_restore(flags);
1186         addr -= begin;
1187
1188         scache_size = addr;
1189         c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22);
1190         c->scache.ways = 1;
1191         c->dcache.waybit = 0;           /* does not matter */
1192
1193         return 1;
1194 }
1195
1196 #if defined(CONFIG_CPU_LOONGSON2)
1197 static void __init loongson2_sc_init(void)
1198 {
1199         struct cpuinfo_mips *c = &current_cpu_data;
1200
1201         scache_size = 512*1024;
1202         c->scache.linesz = 32;
1203         c->scache.ways = 4;
1204         c->scache.waybit = 0;
1205         c->scache.waysize = scache_size / (c->scache.ways);
1206         c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1207         pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1208                scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1209
1210         c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1211 }
1212 #endif
1213
1214 extern int r5k_sc_init(void);
1215 extern int rm7k_sc_init(void);
1216 extern int mips_sc_init(void);
1217
1218 static void setup_scache(void)
1219 {
1220         struct cpuinfo_mips *c = &current_cpu_data;
1221         unsigned int config = read_c0_config();
1222         int sc_present = 0;
1223
1224         /*
1225          * Do the probing thing on R4000SC and R4400SC processors.  Other
1226          * processors don't have a S-cache that would be relevant to the
1227          * Linux memory management.
1228          */
1229         switch (current_cpu_type()) {
1230         case CPU_R4000SC:
1231         case CPU_R4000MC:
1232         case CPU_R4400SC:
1233         case CPU_R4400MC:
1234                 sc_present = run_uncached(probe_scache);
1235                 if (sc_present)
1236                         c->options |= MIPS_CPU_CACHE_CDEX_S;
1237                 break;
1238
1239         case CPU_R10000:
1240         case CPU_R12000:
1241         case CPU_R14000:
1242                 scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16);
1243                 c->scache.linesz = 64 << ((config >> 13) & 1);
1244                 c->scache.ways = 2;
1245                 c->scache.waybit= 0;
1246                 sc_present = 1;
1247                 break;
1248
1249         case CPU_R5000:
1250         case CPU_NEVADA:
1251 #ifdef CONFIG_R5000_CPU_SCACHE
1252                 r5k_sc_init();
1253 #endif
1254                 return;
1255
1256         case CPU_RM7000:
1257 #ifdef CONFIG_RM7000_CPU_SCACHE
1258                 rm7k_sc_init();
1259 #endif
1260                 return;
1261
1262 #if defined(CONFIG_CPU_LOONGSON2)
1263         case CPU_LOONGSON2:
1264                 loongson2_sc_init();
1265                 return;
1266 #endif
1267         case CPU_XLP:
1268                 /* don't need to worry about L2, fully coherent */
1269                 return;
1270
1271         default:
1272                 if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M32R2 |
1273                                     MIPS_CPU_ISA_M64R1 | MIPS_CPU_ISA_M64R2)) {
1274 #ifdef CONFIG_MIPS_CPU_SCACHE
1275                         if (mips_sc_init ()) {
1276                                 scache_size = c->scache.ways * c->scache.sets * c->scache.linesz;
1277                                 printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n",
1278                                        scache_size >> 10,
1279                                        way_string[c->scache.ways], c->scache.linesz);
1280                         }
1281 #else
1282                         if (!(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
1283                                 panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
1284 #endif
1285                         return;
1286                 }
1287                 sc_present = 0;
1288         }
1289
1290         if (!sc_present)
1291                 return;
1292
1293         /* compute a couple of other cache variables */
1294         c->scache.waysize = scache_size / c->scache.ways;
1295
1296         c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1297
1298         printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1299                scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1300
1301         c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1302 }
1303
1304 void au1x00_fixup_config_od(void)
1305 {
1306         /*
1307          * c0_config.od (bit 19) was write only (and read as 0)
1308          * on the early revisions of Alchemy SOCs.  It disables the bus
1309          * transaction overlapping and needs to be set to fix various errata.
1310          */
1311         switch (read_c0_prid()) {
1312         case 0x00030100: /* Au1000 DA */
1313         case 0x00030201: /* Au1000 HA */
1314         case 0x00030202: /* Au1000 HB */
1315         case 0x01030200: /* Au1500 AB */
1316         /*
1317          * Au1100 errata actually keeps silence about this bit, so we set it
1318          * just in case for those revisions that require it to be set according
1319          * to the (now gone) cpu table.
1320          */
1321         case 0x02030200: /* Au1100 AB */
1322         case 0x02030201: /* Au1100 BA */
1323         case 0x02030202: /* Au1100 BC */
1324                 set_c0_config(1 << 19);
1325                 break;
1326         }
1327 }
1328
1329 /* CP0 hazard avoidance. */
1330 #define NXP_BARRIER()                                                   \
1331          __asm__ __volatile__(                                          \
1332         ".set noreorder\n\t"                                            \
1333         "nop; nop; nop; nop; nop; nop;\n\t"                             \
1334         ".set reorder\n\t")
1335
1336 static void nxp_pr4450_fixup_config(void)
1337 {
1338         unsigned long config0;
1339
1340         config0 = read_c0_config();
1341
1342         /* clear all three cache coherency fields */
1343         config0 &= ~(0x7 | (7 << 25) | (7 << 28));
1344         config0 |= (((_page_cachable_default >> _CACHE_SHIFT) <<  0) |
1345                     ((_page_cachable_default >> _CACHE_SHIFT) << 25) |
1346                     ((_page_cachable_default >> _CACHE_SHIFT) << 28));
1347         write_c0_config(config0);
1348         NXP_BARRIER();
1349 }
1350
1351 static int cca = -1;
1352
1353 static int __init cca_setup(char *str)
1354 {
1355         get_option(&str, &cca);
1356
1357         return 0;
1358 }
1359
1360 early_param("cca", cca_setup);
1361
1362 static void coherency_setup(void)
1363 {
1364         if (cca < 0 || cca > 7)
1365                 cca = read_c0_config() & CONF_CM_CMASK;
1366         _page_cachable_default = cca << _CACHE_SHIFT;
1367
1368         pr_debug("Using cache attribute %d\n", cca);
1369         change_c0_config(CONF_CM_CMASK, cca);
1370
1371         /*
1372          * c0_status.cu=0 specifies that updates by the sc instruction use
1373          * the coherency mode specified by the TLB; 1 means cachable
1374          * coherent update on write will be used.  Not all processors have
1375          * this bit and; some wire it to zero, others like Toshiba had the
1376          * silly idea of putting something else there ...
1377          */
1378         switch (current_cpu_type()) {
1379         case CPU_R4000PC:
1380         case CPU_R4000SC:
1381         case CPU_R4000MC:
1382         case CPU_R4400PC:
1383         case CPU_R4400SC:
1384         case CPU_R4400MC:
1385                 clear_c0_config(CONF_CU);
1386                 break;
1387         /*
1388          * We need to catch the early Alchemy SOCs with
1389          * the write-only co_config.od bit and set it back to one on:
1390          * Au1000 rev DA, HA, HB;  Au1100 AB, BA, BC, Au1500 AB
1391          */
1392         case CPU_ALCHEMY:
1393                 au1x00_fixup_config_od();
1394                 break;
1395
1396         case PRID_IMP_PR4450:
1397                 nxp_pr4450_fixup_config();
1398                 break;
1399         }
1400 }
1401
1402 static void r4k_cache_error_setup(void)
1403 {
1404         extern char __weak except_vec2_generic;
1405         extern char __weak except_vec2_sb1;
1406
1407         switch (current_cpu_type()) {
1408         case CPU_SB1:
1409         case CPU_SB1A:
1410                 set_uncached_handler(0x100, &except_vec2_sb1, 0x80);
1411                 break;
1412
1413         default:
1414                 set_uncached_handler(0x100, &except_vec2_generic, 0x80);
1415                 break;
1416         }
1417 }
1418
1419 void r4k_cache_init(void)
1420 {
1421         extern void build_clear_page(void);
1422         extern void build_copy_page(void);
1423         struct cpuinfo_mips *c = &current_cpu_data;
1424
1425         probe_pcache();
1426         setup_scache();
1427
1428         r4k_blast_dcache_page_setup();
1429         r4k_blast_dcache_page_indexed_setup();
1430         r4k_blast_dcache_setup();
1431         r4k_blast_icache_page_setup();
1432         r4k_blast_icache_page_indexed_setup();
1433         r4k_blast_icache_setup();
1434         r4k_blast_scache_page_setup();
1435         r4k_blast_scache_page_indexed_setup();
1436         r4k_blast_scache_setup();
1437
1438         /*
1439          * Some MIPS32 and MIPS64 processors have physically indexed caches.
1440          * This code supports virtually indexed processors and will be
1441          * unnecessarily inefficient on physically indexed processors.
1442          */
1443         if (c->dcache.linesz)
1444                 shm_align_mask = max_t( unsigned long,
1445                                         c->dcache.sets * c->dcache.linesz - 1,
1446                                         PAGE_SIZE - 1);
1447         else
1448                 shm_align_mask = PAGE_SIZE-1;
1449
1450         __flush_cache_vmap      = r4k__flush_cache_vmap;
1451         __flush_cache_vunmap    = r4k__flush_cache_vunmap;
1452
1453         flush_cache_all         = cache_noop;
1454         __flush_cache_all       = r4k___flush_cache_all;
1455         flush_cache_mm          = r4k_flush_cache_mm;
1456         flush_cache_page        = r4k_flush_cache_page;
1457         flush_cache_range       = r4k_flush_cache_range;
1458
1459         __flush_kernel_vmap_range = r4k_flush_kernel_vmap_range;
1460
1461         flush_cache_sigtramp    = r4k_flush_cache_sigtramp;
1462         flush_icache_all        = r4k_flush_icache_all;
1463         local_flush_data_cache_page     = local_r4k_flush_data_cache_page;
1464         flush_data_cache_page   = r4k_flush_data_cache_page;
1465         flush_icache_range      = r4k_flush_icache_range;
1466         local_flush_icache_range        = local_r4k_flush_icache_range;
1467
1468 #if defined(CONFIG_DMA_NONCOHERENT)
1469         if (coherentio) {
1470                 _dma_cache_wback_inv    = (void *)cache_noop;
1471                 _dma_cache_wback        = (void *)cache_noop;
1472                 _dma_cache_inv          = (void *)cache_noop;
1473         } else {
1474                 _dma_cache_wback_inv    = r4k_dma_cache_wback_inv;
1475                 _dma_cache_wback        = r4k_dma_cache_wback_inv;
1476                 _dma_cache_inv          = r4k_dma_cache_inv;
1477         }
1478 #endif
1479
1480         build_clear_page();
1481         build_copy_page();
1482
1483         /*
1484          * We want to run CMP kernels on core with and without coherent
1485          * caches. Therefore, do not use CONFIG_MIPS_CMP to decide whether
1486          * or not to flush caches.
1487          */
1488         local_r4k___flush_cache_all(NULL);
1489
1490         coherency_setup();
1491         board_cache_error_setup = r4k_cache_error_setup;
1492 }