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 (dm@engr.sgi.com)
   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/mm.h>
  17 #include <linux/bitops.h>
  18
  19 #include <asm/bcache.h>
  20 #include <asm/bootinfo.h>
  21 #include <asm/cache.h>
  22 #include <asm/cacheops.h>
  23 #include <asm/cpu.h>
  24 #include <asm/cpu-features.h>
  25 #include <asm/io.h>
  26 #include <asm/page.h>
  27 #include <asm/pgtable.h>
  28 #include <asm/r4kcache.h>
  29 #include <asm/sections.h>
  30 #include <asm/system.h>
  31 #include <asm/mmu_context.h>
  32 #include <asm/war.h>
  33 #include <asm/cacheflush.h> /* for run_uncached() */
  34
  35
  36 /*
  37  * Special Variant of smp_call_function for use by cache functions:
  38  *
  39  *  o No return value
  40  *  o collapses to normal function call on UP kernels
  41  *  o collapses to normal function call on systems with a single shared
  42  *    primary cache.
  43  */
  44 static inline void r4k_on_each_cpu(void (*func) (void *info), void *info,
  45                                    int retry, int wait)
  46 {
  47         preempt_disable();
  48
  49 #if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC)
  50         smp_call_function(func, info, retry, wait);
  51 #endif
  52         func(info);
  53         preempt_enable();
  54 }
  55
  56 /*
  57  * Must die.
  58  */
  59 static unsigned long icache_size __read_mostly;
  60 static unsigned long dcache_size __read_mostly;
  61 static unsigned long scache_size __read_mostly;
  62
  63 /*
  64  * Dummy cache handling routines for machines without boardcaches
  65  */
  66 static void cache_noop(void) {}
  67
  68 static struct bcache_ops no_sc_ops = {
  69         .bc_enable = (void *)cache_noop,
  70         .bc_disable = (void *)cache_noop,
  71         .bc_wback_inv = (void *)cache_noop,
  72         .bc_inv = (void *)cache_noop
  73 };
  74
  75 struct bcache_ops *bcops = &no_sc_ops;
  76
  77 #define cpu_is_r4600_v1_x()     ((read_c0_prid() & 0xfffffff0) == 0x00002010)
  78 #define cpu_is_r4600_v2_x()     ((read_c0_prid() & 0xfffffff0) == 0x00002020)
  79
  80 #define R4600_HIT_CACHEOP_WAR_IMPL                                      \
  81 do {                                                                    \
  82         if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x())            \
  83                 *(volatile unsigned long *)CKSEG1;                      \
  84         if (R4600_V1_HIT_CACHEOP_WAR)                                   \
  85                 __asm__ __volatile__("nop;nop;nop;nop");                \
  86 } while (0)
  87
  88 static void (*r4k_blast_dcache_page)(unsigned long addr);
  89
  90 static inline void r4k_blast_dcache_page_dc32(unsigned long addr)
  91 {
  92         R4600_HIT_CACHEOP_WAR_IMPL;
  93         blast_dcache32_page(addr);
  94 }
  95
  96 static void __cpuinit r4k_blast_dcache_page_setup(void)
  97 {
  98         unsigned long  dc_lsize = cpu_dcache_line_size();
  99
 100         if (dc_lsize == 0)
 101                 r4k_blast_dcache_page = (void *)cache_noop;
 102         else if (dc_lsize == 16)
 103                 r4k_blast_dcache_page = blast_dcache16_page;
 104         else if (dc_lsize == 32)
 105                 r4k_blast_dcache_page = r4k_blast_dcache_page_dc32;
 106 }
 107
 108 static void (* r4k_blast_dcache_page_indexed)(unsigned long addr);
 109
 110 static void __cpuinit r4k_blast_dcache_page_indexed_setup(void)
 111 {
 112         unsigned long dc_lsize = cpu_dcache_line_size();
 113
 114         if (dc_lsize == 0)
 115                 r4k_blast_dcache_page_indexed = (void *)cache_noop;
 116         else if (dc_lsize == 16)
 117                 r4k_blast_dcache_page_indexed = blast_dcache16_page_indexed;
 118         else if (dc_lsize == 32)
 119                 r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed;
 120 }
 121
 122 static void (* r4k_blast_dcache)(void);
 123
 124 static void __cpuinit r4k_blast_dcache_setup(void)
 125 {
 126         unsigned long dc_lsize = cpu_dcache_line_size();
 127
 128         if (dc_lsize == 0)
 129                 r4k_blast_dcache = (void *)cache_noop;
 130         else if (dc_lsize == 16)
 131                 r4k_blast_dcache = blast_dcache16;
 132         else if (dc_lsize == 32)
 133                 r4k_blast_dcache = blast_dcache32;
 134 }
 135
 136 /* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
 137 #define JUMP_TO_ALIGN(order) \
 138         __asm__ __volatile__( \
 139                 "b\t1f\n\t" \
 140                 ".align\t" #order "\n\t" \
 141                 "1:\n\t" \
 142                 )
 143 #define CACHE32_UNROLL32_ALIGN  JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
 144 #define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
 145
 146 static inline void blast_r4600_v1_icache32(void)
 147 {
 148         unsigned long flags;
 149
 150         local_irq_save(flags);
 151         blast_icache32();
 152         local_irq_restore(flags);
 153 }
 154
 155 static inline void tx49_blast_icache32(void)
 156 {
 157         unsigned long start = INDEX_BASE;
 158         unsigned long end = start + current_cpu_data.icache.waysize;
 159         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 160         unsigned long ws_end = current_cpu_data.icache.ways <<
 161                                current_cpu_data.icache.waybit;
 162         unsigned long ws, addr;
 163
 164         CACHE32_UNROLL32_ALIGN2;
 165         /* I'm in even chunk.  blast odd chunks */
 166         for (ws = 0; ws < ws_end; ws += ws_inc)
 167                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 168                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 169         CACHE32_UNROLL32_ALIGN;
 170         /* I'm in odd chunk.  blast even chunks */
 171         for (ws = 0; ws < ws_end; ws += ws_inc)
 172                 for (addr = start; addr < end; addr += 0x400 * 2)
 173                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 174 }
 175
 176 static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page)
 177 {
 178         unsigned long flags;
 179
 180         local_irq_save(flags);
 181         blast_icache32_page_indexed(page);
 182         local_irq_restore(flags);
 183 }
 184
 185 static inline void tx49_blast_icache32_page_indexed(unsigned long page)
 186 {
 187         unsigned long indexmask = current_cpu_data.icache.waysize - 1;
 188         unsigned long start = INDEX_BASE + (page & indexmask);
 189         unsigned long end = start + PAGE_SIZE;
 190         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 191         unsigned long ws_end = current_cpu_data.icache.ways <<
 192                                current_cpu_data.icache.waybit;
 193         unsigned long ws, addr;
 194
 195         CACHE32_UNROLL32_ALIGN2;
 196         /* I'm in even chunk.  blast odd chunks */
 197         for (ws = 0; ws < ws_end; ws += ws_inc)
 198                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 199                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 200         CACHE32_UNROLL32_ALIGN;
 201         /* I'm in odd chunk.  blast even chunks */
 202         for (ws = 0; ws < ws_end; ws += ws_inc)
 203                 for (addr = start; addr < end; addr += 0x400 * 2)
 204                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 205 }
 206
 207 static void (* r4k_blast_icache_page)(unsigned long addr);
 208
 209 static void __cpuinit r4k_blast_icache_page_setup(void)
 210 {
 211         unsigned long ic_lsize = cpu_icache_line_size();
 212
 213         if (ic_lsize == 0)
 214                 r4k_blast_icache_page = (void *)cache_noop;
 215         else if (ic_lsize == 16)
 216                 r4k_blast_icache_page = blast_icache16_page;
 217         else if (ic_lsize == 32)
 218                 r4k_blast_icache_page = blast_icache32_page;
 219         else if (ic_lsize == 64)
 220                 r4k_blast_icache_page = blast_icache64_page;
 221 }
 222
 223
 224 static void (* r4k_blast_icache_page_indexed)(unsigned long addr);
 225
 226 static void __cpuinit r4k_blast_icache_page_indexed_setup(void)
 227 {
 228         unsigned long ic_lsize = cpu_icache_line_size();
 229
 230         if (ic_lsize == 0)
 231                 r4k_blast_icache_page_indexed = (void *)cache_noop;
 232         else if (ic_lsize == 16)
 233                 r4k_blast_icache_page_indexed = blast_icache16_page_indexed;
 234         else if (ic_lsize == 32) {
 235                 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
 236                         r4k_blast_icache_page_indexed =
 237                                 blast_icache32_r4600_v1_page_indexed;
 238                 else if (TX49XX_ICACHE_INDEX_INV_WAR)
 239                         r4k_blast_icache_page_indexed =
 240                                 tx49_blast_icache32_page_indexed;
 241                 else
 242                         r4k_blast_icache_page_indexed =
 243                                 blast_icache32_page_indexed;
 244         } else if (ic_lsize == 64)
 245                 r4k_blast_icache_page_indexed = blast_icache64_page_indexed;
 246 }
 247
 248 static void (* r4k_blast_icache)(void);
 249
 250 static void __cpuinit r4k_blast_icache_setup(void)
 251 {
 252         unsigned long ic_lsize = cpu_icache_line_size();
 253
 254         if (ic_lsize == 0)
 255                 r4k_blast_icache = (void *)cache_noop;
 256         else if (ic_lsize == 16)
 257                 r4k_blast_icache = blast_icache16;
 258         else if (ic_lsize == 32) {
 259                 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
 260                         r4k_blast_icache = blast_r4600_v1_icache32;
 261                 else if (TX49XX_ICACHE_INDEX_INV_WAR)
 262                         r4k_blast_icache = tx49_blast_icache32;
 263                 else
 264                         r4k_blast_icache = blast_icache32;
 265         } else if (ic_lsize == 64)
 266                 r4k_blast_icache = blast_icache64;
 267 }
 268
 269 static void (* r4k_blast_scache_page)(unsigned long addr);
 270
 271 static void __cpuinit r4k_blast_scache_page_setup(void)
 272 {
 273         unsigned long sc_lsize = cpu_scache_line_size();
 274
 275         if (scache_size == 0)
 276                 r4k_blast_scache_page = (void *)cache_noop;
 277         else if (sc_lsize == 16)
 278                 r4k_blast_scache_page = blast_scache16_page;
 279         else if (sc_lsize == 32)
 280                 r4k_blast_scache_page = blast_scache32_page;
 281         else if (sc_lsize == 64)
 282                 r4k_blast_scache_page = blast_scache64_page;
 283         else if (sc_lsize == 128)
 284                 r4k_blast_scache_page = blast_scache128_page;
 285 }
 286
 287 static void (* r4k_blast_scache_page_indexed)(unsigned long addr);
 288
 289 static void __cpuinit r4k_blast_scache_page_indexed_setup(void)
 290 {
 291         unsigned long sc_lsize = cpu_scache_line_size();
 292
 293         if (scache_size == 0)
 294                 r4k_blast_scache_page_indexed = (void *)cache_noop;
 295         else if (sc_lsize == 16)
 296                 r4k_blast_scache_page_indexed = blast_scache16_page_indexed;
 297         else if (sc_lsize == 32)
 298                 r4k_blast_scache_page_indexed = blast_scache32_page_indexed;
 299         else if (sc_lsize == 64)
 300                 r4k_blast_scache_page_indexed = blast_scache64_page_indexed;
 301         else if (sc_lsize == 128)
 302                 r4k_blast_scache_page_indexed = blast_scache128_page_indexed;
 303 }
 304
 305 static void (* r4k_blast_scache)(void);
 306
 307 static void __cpuinit r4k_blast_scache_setup(void)
 308 {
 309         unsigned long sc_lsize = cpu_scache_line_size();
 310
 311         if (scache_size == 0)
 312                 r4k_blast_scache = (void *)cache_noop;
 313         else if (sc_lsize == 16)
 314                 r4k_blast_scache = blast_scache16;
 315         else if (sc_lsize == 32)
 316                 r4k_blast_scache = blast_scache32;
 317         else if (sc_lsize == 64)
 318                 r4k_blast_scache = blast_scache64;
 319         else if (sc_lsize == 128)
 320                 r4k_blast_scache = blast_scache128;
 321 }
 322
 323 static inline void local_r4k___flush_cache_all(void * args)
 324 {
 325 #if defined(CONFIG_CPU_LOONGSON2)
 326         r4k_blast_scache();
 327         return;
 328 #endif
 329         r4k_blast_dcache();
 330         r4k_blast_icache();
 331
 332         switch (current_cpu_type()) {
 333         case CPU_R4000SC:
 334         case CPU_R4000MC:
 335         case CPU_R4400SC:
 336         case CPU_R4400MC:
 337         case CPU_R10000:
 338         case CPU_R12000:
 339         case CPU_R14000:
 340                 r4k_blast_scache();
 341         }
 342 }
 343
 344 static void r4k___flush_cache_all(void)
 345 {
 346         r4k_on_each_cpu(local_r4k___flush_cache_all, NULL, 1, 1);
 347 }
 348
 349 static inline int has_valid_asid(const struct mm_struct *mm)
 350 {
 351 #if defined(CONFIG_MIPS_MT_SMP) || defined(CONFIG_MIPS_MT_SMTC)
 352         int i;
 353
 354         for_each_online_cpu(i)
 355                 if (cpu_context(i, mm))
 356                         return 1;
 357
 358         return 0;
 359 #else
 360         return cpu_context(smp_processor_id(), mm);
 361 #endif
 362 }
 363
 364 static void r4k__flush_cache_vmap(void)
 365 {
 366         r4k_blast_dcache();
 367 }
 368
 369 static void r4k__flush_cache_vunmap(void)
 370 {
 371         r4k_blast_dcache();
 372 }
 373
 374 static inline void local_r4k_flush_cache_range(void * args)
 375 {
 376         struct vm_area_struct *vma = args;
 377         int exec = vma->vm_flags & VM_EXEC;
 378
 379         if (!(has_valid_asid(vma->vm_mm)))
 380                 return;
 381
 382         r4k_blast_dcache();
 383         if (exec)
 384                 r4k_blast_icache();
 385 }
 386
 387 static void r4k_flush_cache_range(struct vm_area_struct *vma,
 388         unsigned long start, unsigned long end)
 389 {
 390         int exec = vma->vm_flags & VM_EXEC;
 391
 392         if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc))
 393                 r4k_on_each_cpu(local_r4k_flush_cache_range, vma, 1, 1);
 394 }
 395
 396 static inline void local_r4k_flush_cache_mm(void * args)
 397 {
 398         struct mm_struct *mm = args;
 399
 400         if (!has_valid_asid(mm))
 401                 return;
 402
 403         /*
 404          * Kludge alert.  For obscure reasons R4000SC and R4400SC go nuts if we
 405          * only flush the primary caches but R10000 and R12000 behave sane ...
 406          * R4000SC and R4400SC indexed S-cache ops also invalidate primary
 407          * caches, so we can bail out early.
 408          */
 409         if (current_cpu_type() == CPU_R4000SC ||
 410             current_cpu_type() == CPU_R4000MC ||
 411             current_cpu_type() == CPU_R4400SC ||
 412             current_cpu_type() == CPU_R4400MC) {
 413                 r4k_blast_scache();
 414                 return;
 415         }
 416
 417         r4k_blast_dcache();
 418 }
 419
 420 static void r4k_flush_cache_mm(struct mm_struct *mm)
 421 {
 422         if (!cpu_has_dc_aliases)
 423                 return;
 424
 425         r4k_on_each_cpu(local_r4k_flush_cache_mm, mm, 1, 1);
 426 }
 427
 428 struct flush_cache_page_args {
 429         struct vm_area_struct *vma;
 430         unsigned long addr;
 431         unsigned long pfn;
 432 };
 433
 434 static inline void local_r4k_flush_cache_page(void *args)
 435 {
 436         struct flush_cache_page_args *fcp_args = args;
 437         struct vm_area_struct *vma = fcp_args->vma;
 438         unsigned long addr = fcp_args->addr;
 439         struct page *page = pfn_to_page(fcp_args->pfn);
 440         int exec = vma->vm_flags & VM_EXEC;
 441         struct mm_struct *mm = vma->vm_mm;
 442         pgd_t *pgdp;
 443         pud_t *pudp;
 444         pmd_t *pmdp;
 445         pte_t *ptep;
 446         void *vaddr;
 447
 448         /*
 449          * If ownes no valid ASID yet, cannot possibly have gotten
 450          * this page into the cache.
 451          */
 452         if (!has_valid_asid(mm))
 453                 return;
 454
 455         addr &= PAGE_MASK;
 456         pgdp = pgd_offset(mm, addr);
 457         pudp = pud_offset(pgdp, addr);
 458         pmdp = pmd_offset(pudp, addr);
 459         ptep = pte_offset(pmdp, addr);
 460
 461         /*
 462          * If the page isn't marked valid, the page cannot possibly be
 463          * in the cache.
 464          */
 465         if (!(pte_present(*ptep)))
 466                 return;
 467
 468         if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID))
 469                 vaddr = NULL;
 470         else {
 471                 /*
 472                  * Use kmap_coherent or kmap_atomic to do flushes for
 473                  * another ASID than the current one.
 474                  */
 475                 if (cpu_has_dc_aliases)
 476                         vaddr = kmap_coherent(page, addr);
 477                 else
 478                         vaddr = kmap_atomic(page, KM_USER0);
 479                 addr = (unsigned long)vaddr;
 480         }
 481
 482         if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
 483                 r4k_blast_dcache_page(addr);
 484         }
 485         if (exec) {
 486                 if (vaddr && cpu_has_vtag_icache && mm == current->active_mm) {
 487                         int cpu = smp_processor_id();
 488
 489                         if (cpu_context(cpu, mm) != 0)
 490                                 drop_mmu_context(mm, cpu);
 491                 } else
 492                         r4k_blast_icache_page(addr);
 493         }
 494
 495         if (vaddr) {
 496                 if (cpu_has_dc_aliases)
 497                         kunmap_coherent();
 498                 else
 499                         kunmap_atomic(vaddr, KM_USER0);
 500         }
 501 }
 502
 503 static void r4k_flush_cache_page(struct vm_area_struct *vma,
 504         unsigned long addr, unsigned long pfn)
 505 {
 506         struct flush_cache_page_args args;
 507
 508         args.vma = vma;
 509         args.addr = addr;
 510         args.pfn = pfn;
 511
 512         r4k_on_each_cpu(local_r4k_flush_cache_page, &args, 1, 1);
 513 }
 514
 515 static inline void local_r4k_flush_data_cache_page(void * addr)
 516 {
 517         r4k_blast_dcache_page((unsigned long) addr);
 518 }
 519
 520 static void r4k_flush_data_cache_page(unsigned long addr)
 521 {
 522         if (in_atomic())
 523                 local_r4k_flush_data_cache_page((void *)addr);
 524         else
 525                 r4k_on_each_cpu(local_r4k_flush_data_cache_page, (void *) addr,
 526                                 1, 1);
 527 }
 528
 529 struct flush_icache_range_args {
 530         unsigned long start;
 531         unsigned long end;
 532 };
 533
 534 static inline void local_r4k_flush_icache_range(void *args)
 535 {
 536         struct flush_icache_range_args *fir_args = args;
 537         unsigned long start = fir_args->start;
 538         unsigned long end = fir_args->end;
 539
 540         if (!cpu_has_ic_fills_f_dc) {
 541                 if (end - start >= dcache_size) {
 542                         r4k_blast_dcache();
 543                 } else {
 544                         R4600_HIT_CACHEOP_WAR_IMPL;
 545                         protected_blast_dcache_range(start, end);
 546                 }
 547         }
 548
 549         if (end - start > icache_size)
 550                 r4k_blast_icache();
 551         else
 552                 protected_blast_icache_range(start, end);
 553 }
 554
 555 static void r4k_flush_icache_range(unsigned long start, unsigned long end)
 556 {
 557         struct flush_icache_range_args args;
 558
 559         args.start = start;
 560         args.end = end;
 561
 562         r4k_on_each_cpu(local_r4k_flush_icache_range, &args, 1, 1);
 563         instruction_hazard();
 564 }
 565
 566 #ifdef CONFIG_DMA_NONCOHERENT
 567
 568 static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
 569 {
 570         /* Catch bad driver code */
 571         BUG_ON(size == 0);
 572
 573         if (cpu_has_inclusive_pcaches) {
 574                 if (size >= scache_size)
 575                         r4k_blast_scache();
 576                 else
 577                         blast_scache_range(addr, addr + size);
 578                 return;
 579         }
 580
 581         /*
 582          * Either no secondary cache or the available caches don't have the
 583          * subset property so we have to flush the primary caches
 584          * explicitly
 585          */
 586         if (size >= dcache_size) {
 587                 r4k_blast_dcache();
 588         } else {
 589                 R4600_HIT_CACHEOP_WAR_IMPL;
 590                 blast_dcache_range(addr, addr + size);
 591         }
 592
 593         bc_wback_inv(addr, size);
 594 }
 595
 596 static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
 597 {
 598         /* Catch bad driver code */
 599         BUG_ON(size == 0);
 600
 601         if (cpu_has_inclusive_pcaches) {
 602                 if (size >= scache_size)
 603                         r4k_blast_scache();
 604                 else
 605                         blast_inv_scache_range(addr, addr + size);
 606                 return;
 607         }
 608
 609         if (size >= dcache_size) {
 610                 r4k_blast_dcache();
 611         } else {
 612                 R4600_HIT_CACHEOP_WAR_IMPL;
 613                 blast_inv_dcache_range(addr, addr + size);
 614         }
 615
 616         bc_inv(addr, size);
 617 }
 618 #endif /* CONFIG_DMA_NONCOHERENT */
 619
 620 /*
 621  * While we're protected against bad userland addresses we don't care
 622  * very much about what happens in that case.  Usually a segmentation
 623  * fault will dump the process later on anyway ...
 624  */
 625 static void local_r4k_flush_cache_sigtramp(void * arg)
 626 {
 627         unsigned long ic_lsize = cpu_icache_line_size();
 628         unsigned long dc_lsize = cpu_dcache_line_size();
 629         unsigned long sc_lsize = cpu_scache_line_size();
 630         unsigned long addr = (unsigned long) arg;
 631
 632         R4600_HIT_CACHEOP_WAR_IMPL;
 633         if (dc_lsize)
 634                 protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
 635         if (!cpu_icache_snoops_remote_store && scache_size)
 636                 protected_writeback_scache_line(addr & ~(sc_lsize - 1));
 637         if (ic_lsize)
 638                 protected_flush_icache_line(addr & ~(ic_lsize - 1));
 639         if (MIPS4K_ICACHE_REFILL_WAR) {
 640                 __asm__ __volatile__ (
 641                         ".set push\n\t"
 642                         ".set noat\n\t"
 643                         ".set mips3\n\t"
 644 #ifdef CONFIG_32BIT
 645                         "la     $at,1f\n\t"
 646 #endif
 647 #ifdef CONFIG_64BIT
 648                         "dla    $at,1f\n\t"
 649 #endif
 650                         "cache  %0,($at)\n\t"
 651                         "nop; nop; nop\n"
 652                         "1:\n\t"
 653                         ".set pop"
 654                         :
 655                         : "i" (Hit_Invalidate_I));
 656         }
 657         if (MIPS_CACHE_SYNC_WAR)
 658                 __asm__ __volatile__ ("sync");
 659 }
 660
 661 static void r4k_flush_cache_sigtramp(unsigned long addr)
 662 {
 663         r4k_on_each_cpu(local_r4k_flush_cache_sigtramp, (void *) addr, 1, 1);
 664 }
 665
 666 static void r4k_flush_icache_all(void)
 667 {
 668         if (cpu_has_vtag_icache)
 669                 r4k_blast_icache();
 670 }
 671
 672 static inline void rm7k_erratum31(void)
 673 {
 674         const unsigned long ic_lsize = 32;
 675         unsigned long addr;
 676
 677         /* RM7000 erratum #31. The icache is screwed at startup. */
 678         write_c0_taglo(0);
 679         write_c0_taghi(0);
 680
 681         for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) {
 682                 __asm__ __volatile__ (
 683                         ".set push\n\t"
 684                         ".set noreorder\n\t"
 685                         ".set mips3\n\t"
 686                         "cache\t%1, 0(%0)\n\t"
 687                         "cache\t%1, 0x1000(%0)\n\t"
 688                         "cache\t%1, 0x2000(%0)\n\t"
 689                         "cache\t%1, 0x3000(%0)\n\t"
 690                         "cache\t%2, 0(%0)\n\t"
 691                         "cache\t%2, 0x1000(%0)\n\t"
 692                         "cache\t%2, 0x2000(%0)\n\t"
 693                         "cache\t%2, 0x3000(%0)\n\t"
 694                         "cache\t%1, 0(%0)\n\t"
 695                         "cache\t%1, 0x1000(%0)\n\t"
 696                         "cache\t%1, 0x2000(%0)\n\t"
 697                         "cache\t%1, 0x3000(%0)\n\t"
 698                         ".set pop\n"
 699                         :
 700                         : "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill));
 701         }
 702 }
 703
 704 static char *way_string[] __cpuinitdata = { NULL, "direct mapped", "2-way",
 705         "3-way", "4-way", "5-way", "6-way", "7-way", "8-way"
 706 };
 707
 708 static void __cpuinit probe_pcache(void)
 709 {
 710         struct cpuinfo_mips *c = &current_cpu_data;
 711         unsigned int config = read_c0_config();
 712         unsigned int prid = read_c0_prid();
 713         unsigned long config1;
 714         unsigned int lsize;
 715
 716         switch (c->cputype) {
 717         case CPU_R4600:                 /* QED style two way caches? */
 718         case CPU_R4700:
 719         case CPU_R5000:
 720         case CPU_NEVADA:
 721                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 722                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 723                 c->icache.ways = 2;
 724                 c->icache.waybit = __ffs(icache_size/2);
 725
 726                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 727                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 728                 c->dcache.ways = 2;
 729                 c->dcache.waybit= __ffs(dcache_size/2);
 730
 731                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 732                 break;
 733
 734         case CPU_R5432:
 735         case CPU_R5500:
 736                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 737                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 738                 c->icache.ways = 2;
 739                 c->icache.waybit= 0;
 740
 741                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 742                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 743                 c->dcache.ways = 2;
 744                 c->dcache.waybit = 0;
 745
 746                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 747                 break;
 748
 749         case CPU_TX49XX:
 750                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 751                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 752                 c->icache.ways = 4;
 753                 c->icache.waybit= 0;
 754
 755                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 756                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 757                 c->dcache.ways = 4;
 758                 c->dcache.waybit = 0;
 759
 760                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 761                 c->options |= MIPS_CPU_PREFETCH;
 762                 break;
 763
 764         case CPU_R4000PC:
 765         case CPU_R4000SC:
 766         case CPU_R4000MC:
 767         case CPU_R4400PC:
 768         case CPU_R4400SC:
 769         case CPU_R4400MC:
 770         case CPU_R4300:
 771                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 772                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 773                 c->icache.ways = 1;
 774                 c->icache.waybit = 0;   /* doesn't matter */
 775
 776                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 777                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 778                 c->dcache.ways = 1;
 779                 c->dcache.waybit = 0;   /* does not matter */
 780
 781                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 782                 break;
 783
 784         case CPU_R10000:
 785         case CPU_R12000:
 786         case CPU_R14000:
 787                 icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29));
 788                 c->icache.linesz = 64;
 789                 c->icache.ways = 2;
 790                 c->icache.waybit = 0;
 791
 792                 dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26));
 793                 c->dcache.linesz = 32;
 794                 c->dcache.ways = 2;
 795                 c->dcache.waybit = 0;
 796
 797                 c->options |= MIPS_CPU_PREFETCH;
 798                 break;
 799
 800         case CPU_VR4133:
 801                 write_c0_config(config & ~VR41_CONF_P4K);
 802         case CPU_VR4131:
 803                 /* Workaround for cache instruction bug of VR4131 */
 804                 if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U ||
 805                     c->processor_id == 0x0c82U) {
 806                         config |= 0x00400000U;
 807                         if (c->processor_id == 0x0c80U)
 808                                 config |= VR41_CONF_BP;
 809                         write_c0_config(config);
 810                 } else
 811                         c->options |= MIPS_CPU_CACHE_CDEX_P;
 812
 813                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
 814                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 815                 c->icache.ways = 2;
 816                 c->icache.waybit = __ffs(icache_size/2);
 817
 818                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
 819                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 820                 c->dcache.ways = 2;
 821                 c->dcache.waybit = __ffs(dcache_size/2);
 822                 break;
 823
 824         case CPU_VR41XX:
 825         case CPU_VR4111:
 826         case CPU_VR4121:
 827         case CPU_VR4122:
 828         case CPU_VR4181:
 829         case CPU_VR4181A:
 830                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
 831                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 832                 c->icache.ways = 1;
 833                 c->icache.waybit = 0;   /* doesn't matter */
 834
 835                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
 836                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 837                 c->dcache.ways = 1;
 838                 c->dcache.waybit = 0;   /* does not matter */
 839
 840                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 841                 break;
 842
 843         case CPU_RM7000:
 844                 rm7k_erratum31();
 845
 846         case CPU_RM9000:
 847                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 848                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 849                 c->icache.ways = 4;
 850                 c->icache.waybit = __ffs(icache_size / c->icache.ways);
 851
 852                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 853                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 854                 c->dcache.ways = 4;
 855                 c->dcache.waybit = __ffs(dcache_size / c->dcache.ways);
 856
 857 #if !defined(CONFIG_SMP) || !defined(RM9000_CDEX_SMP_WAR)
 858                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 859 #endif
 860                 c->options |= MIPS_CPU_PREFETCH;
 861                 break;
 862
 863         case CPU_LOONGSON2:
 864                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 865                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 866                 if (prid & 0x3)
 867                         c->icache.ways = 4;
 868                 else
 869                         c->icache.ways = 2;
 870                 c->icache.waybit = 0;
 871
 872                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 873                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 874                 if (prid & 0x3)
 875                         c->dcache.ways = 4;
 876                 else
 877                         c->dcache.ways = 2;
 878                 c->dcache.waybit = 0;
 879                 break;
 880
 881         default:
 882                 if (!(config & MIPS_CONF_M))
 883                         panic("Don't know how to probe P-caches on this cpu.");
 884
 885                 /*
 886                  * So we seem to be a MIPS32 or MIPS64 CPU
 887                  * So let's probe the I-cache ...
 888                  */
 889                 config1 = read_c0_config1();
 890
 891                 if ((lsize = ((config1 >> 19) & 7)))
 892                         c->icache.linesz = 2 << lsize;
 893                 else
 894                         c->icache.linesz = lsize;
 895                 c->icache.sets = 64 << ((config1 >> 22) & 7);
 896                 c->icache.ways = 1 + ((config1 >> 16) & 7);
 897
 898                 icache_size = c->icache.sets *
 899                               c->icache.ways *
 900                               c->icache.linesz;
 901                 c->icache.waybit = __ffs(icache_size/c->icache.ways);
 902
 903                 if (config & 0x8)               /* VI bit */
 904                         c->icache.flags |= MIPS_CACHE_VTAG;
 905
 906                 /*
 907                  * Now probe the MIPS32 / MIPS64 data cache.
 908                  */
 909                 c->dcache.flags = 0;
 910
 911                 if ((lsize = ((config1 >> 10) & 7)))
 912                         c->dcache.linesz = 2 << lsize;
 913                 else
 914                         c->dcache.linesz= lsize;
 915                 c->dcache.sets = 64 << ((config1 >> 13) & 7);
 916                 c->dcache.ways = 1 + ((config1 >> 7) & 7);
 917
 918                 dcache_size = c->dcache.sets *
 919                               c->dcache.ways *
 920                               c->dcache.linesz;
 921                 c->dcache.waybit = __ffs(dcache_size/c->dcache.ways);
 922
 923                 c->options |= MIPS_CPU_PREFETCH;
 924                 break;
 925         }
 926
 927         /*
 928          * Processor configuration sanity check for the R4000SC erratum
 929          * #5.  With page sizes larger than 32kB there is no possibility
 930          * to get a VCE exception anymore so we don't care about this
 931          * misconfiguration.  The case is rather theoretical anyway;
 932          * presumably no vendor is shipping his hardware in the "bad"
 933          * configuration.
 934          */
 935         if ((prid & 0xff00) == PRID_IMP_R4000 && (prid & 0xff) < 0x40 &&
 936             !(config & CONF_SC) && c->icache.linesz != 16 &&
 937             PAGE_SIZE <= 0x8000)
 938                 panic("Improper R4000SC processor configuration detected");
 939
 940         /* compute a couple of other cache variables */
 941         c->icache.waysize = icache_size / c->icache.ways;
 942         c->dcache.waysize = dcache_size / c->dcache.ways;
 943
 944         c->icache.sets = c->icache.linesz ?
 945                 icache_size / (c->icache.linesz * c->icache.ways) : 0;
 946         c->dcache.sets = c->dcache.linesz ?
 947                 dcache_size / (c->dcache.linesz * c->dcache.ways) : 0;
 948
 949         /*
 950          * R10000 and R12000 P-caches are odd in a positive way.  They're 32kB
 951          * 2-way virtually indexed so normally would suffer from aliases.  So
 952          * normally they'd suffer from aliases but magic in the hardware deals
 953          * with that for us so we don't need to take care ourselves.
 954          */
 955         switch (c->cputype) {
 956         case CPU_20KC:
 957         case CPU_25KF:
 958         case CPU_SB1:
 959         case CPU_SB1A:
 960                 c->dcache.flags |= MIPS_CACHE_PINDEX;
 961                 break;
 962
 963         case CPU_R10000:
 964         case CPU_R12000:
 965         case CPU_R14000:
 966                 break;
 967
 968         case CPU_24K:
 969         case CPU_34K:
 970         case CPU_74K:
 971                 if ((read_c0_config7() & (1 << 16))) {
 972                         /* effectively physically indexed dcache,
 973                            thus no virtual aliases. */
 974                         c->dcache.flags |= MIPS_CACHE_PINDEX;
 975                         break;
 976                 }
 977         default:
 978                 if (c->dcache.waysize > PAGE_SIZE)
 979                         c->dcache.flags |= MIPS_CACHE_ALIASES;
 980         }
 981
 982         switch (c->cputype) {
 983         case CPU_20KC:
 984                 /*
 985                  * Some older 20Kc chips doesn't have the 'VI' bit in
 986                  * the config register.
 987                  */
 988                 c->icache.flags |= MIPS_CACHE_VTAG;
 989                 break;
 990
 991         case CPU_AU1000:
 992         case CPU_AU1500:
 993         case CPU_AU1100:
 994         case CPU_AU1550:
 995         case CPU_AU1200:
 996         case CPU_AU1210:
 997         case CPU_AU1250:
 998                 c->icache.flags |= MIPS_CACHE_IC_F_DC;
 999                 break;
1000         }
1001
1002 #ifdef  CONFIG_CPU_LOONGSON2
1003         /*
1004          * LOONGSON2 has 4 way icache, but when using indexed cache op,
1005          * one op will act on all 4 ways
1006          */
1007         c->icache.ways = 1;
1008 #endif
1009
1010         printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
1011                icache_size >> 10,
1012                cpu_has_vtag_icache ? "VIVT" : "VIPT",
1013                way_string[c->icache.ways], c->icache.linesz);
1014
1015         printk("Primary data cache %ldkB, %s, %s, %s, linesize %d bytes\n",
1016                dcache_size >> 10, way_string[c->dcache.ways],
1017                (c->dcache.flags & MIPS_CACHE_PINDEX) ? "PIPT" : "VIPT",
1018                (c->dcache.flags & MIPS_CACHE_ALIASES) ?
1019                         "cache aliases" : "no aliases",
1020                c->dcache.linesz);
1021 }
1022
1023 /*
1024  * If you even _breathe_ on this function, look at the gcc output and make sure
1025  * it does not pop things on and off the stack for the cache sizing loop that
1026  * executes in KSEG1 space or else you will crash and burn badly.  You have
1027  * been warned.
1028  */
1029 static int __cpuinit probe_scache(void)
1030 {
1031         unsigned long flags, addr, begin, end, pow2;
1032         unsigned int config = read_c0_config();
1033         struct cpuinfo_mips *c = &current_cpu_data;
1034         int tmp;
1035
1036         if (config & CONF_SC)
1037                 return 0;
1038
1039         begin = (unsigned long) &_stext;
1040         begin &= ~((4 * 1024 * 1024) - 1);
1041         end = begin + (4 * 1024 * 1024);
1042
1043         /*
1044          * This is such a bitch, you'd think they would make it easy to do
1045          * this.  Away you daemons of stupidity!
1046          */
1047         local_irq_save(flags);
1048
1049         /* Fill each size-multiple cache line with a valid tag. */
1050         pow2 = (64 * 1024);
1051         for (addr = begin; addr < end; addr = (begin + pow2)) {
1052                 unsigned long *p = (unsigned long *) addr;
1053                 __asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
1054                 pow2 <<= 1;
1055         }
1056
1057         /* Load first line with zero (therefore invalid) tag. */
1058         write_c0_taglo(0);
1059         write_c0_taghi(0);
1060         __asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
1061         cache_op(Index_Store_Tag_I, begin);
1062         cache_op(Index_Store_Tag_D, begin);
1063         cache_op(Index_Store_Tag_SD, begin);
1064
1065         /* Now search for the wrap around point. */
1066         pow2 = (128 * 1024);
1067         tmp = 0;
1068         for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) {
1069                 cache_op(Index_Load_Tag_SD, addr);
1070                 __asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
1071                 if (!read_c0_taglo())
1072                         break;
1073                 pow2 <<= 1;
1074         }
1075         local_irq_restore(flags);
1076         addr -= begin;
1077
1078         scache_size = addr;
1079         c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22);
1080         c->scache.ways = 1;
1081         c->dcache.waybit = 0;           /* does not matter */
1082
1083         return 1;
1084 }
1085
1086 #if defined(CONFIG_CPU_LOONGSON2)
1087 static void __init loongson2_sc_init(void)
1088 {
1089         struct cpuinfo_mips *c = &current_cpu_data;
1090
1091         scache_size = 512*1024;
1092         c->scache.linesz = 32;
1093         c->scache.ways = 4;
1094         c->scache.waybit = 0;
1095         c->scache.waysize = scache_size / (c->scache.ways);
1096         c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1097         pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1098                scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1099
1100         c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1101 }
1102 #endif
1103
1104 extern int r5k_sc_init(void);
1105 extern int rm7k_sc_init(void);
1106 extern int mips_sc_init(void);
1107
1108 static void __cpuinit setup_scache(void)
1109 {
1110         struct cpuinfo_mips *c = &current_cpu_data;
1111         unsigned int config = read_c0_config();
1112         int sc_present = 0;
1113
1114         /*
1115          * Do the probing thing on R4000SC and R4400SC processors.  Other
1116          * processors don't have a S-cache that would be relevant to the
1117          * Linux memory management.
1118          */
1119         switch (c->cputype) {
1120         case CPU_R4000SC:
1121         case CPU_R4000MC:
1122         case CPU_R4400SC:
1123         case CPU_R4400MC:
1124                 sc_present = run_uncached(probe_scache);
1125                 if (sc_present)
1126                         c->options |= MIPS_CPU_CACHE_CDEX_S;
1127                 break;
1128
1129         case CPU_R10000:
1130         case CPU_R12000:
1131         case CPU_R14000:
1132                 scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16);
1133                 c->scache.linesz = 64 << ((config >> 13) & 1);
1134                 c->scache.ways = 2;
1135                 c->scache.waybit= 0;
1136                 sc_present = 1;
1137                 break;
1138
1139         case CPU_R5000:
1140         case CPU_NEVADA:
1141 #ifdef CONFIG_R5000_CPU_SCACHE
1142                 r5k_sc_init();
1143 #endif
1144                 return;
1145
1146         case CPU_RM7000:
1147         case CPU_RM9000:
1148 #ifdef CONFIG_RM7000_CPU_SCACHE
1149                 rm7k_sc_init();
1150 #endif
1151                 return;
1152
1153 #if defined(CONFIG_CPU_LOONGSON2)
1154         case CPU_LOONGSON2:
1155                 loongson2_sc_init();
1156                 return;
1157 #endif
1158
1159         default:
1160                 if (c->isa_level == MIPS_CPU_ISA_M32R1 ||
1161                     c->isa_level == MIPS_CPU_ISA_M32R2 ||
1162                     c->isa_level == MIPS_CPU_ISA_M64R1 ||
1163                     c->isa_level == MIPS_CPU_ISA_M64R2) {
1164 #ifdef CONFIG_MIPS_CPU_SCACHE
1165                         if (mips_sc_init ()) {
1166                                 scache_size = c->scache.ways * c->scache.sets * c->scache.linesz;
1167                                 printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n",
1168                                        scache_size >> 10,
1169                                        way_string[c->scache.ways], c->scache.linesz);
1170                         }
1171 #else
1172                         if (!(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
1173                                 panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
1174 #endif
1175                         return;
1176                 }
1177                 sc_present = 0;
1178         }
1179
1180         if (!sc_present)
1181                 return;
1182
1183         /* compute a couple of other cache variables */
1184         c->scache.waysize = scache_size / c->scache.ways;
1185
1186         c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1187
1188         printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1189                scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1190
1191         c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1192 }
1193
1194 void au1x00_fixup_config_od(void)
1195 {
1196         /*
1197          * c0_config.od (bit 19) was write only (and read as 0)
1198          * on the early revisions of Alchemy SOCs.  It disables the bus
1199          * transaction overlapping and needs to be set to fix various errata.
1200          */
1201         switch (read_c0_prid()) {
1202         case 0x00030100: /* Au1000 DA */
1203         case 0x00030201: /* Au1000 HA */
1204         case 0x00030202: /* Au1000 HB */
1205         case 0x01030200: /* Au1500 AB */
1206         /*
1207          * Au1100 errata actually keeps silence about this bit, so we set it
1208          * just in case for those revisions that require it to be set according
1209          * to arch/mips/au1000/common/cputable.c
1210          */
1211         case 0x02030200: /* Au1100 AB */
1212         case 0x02030201: /* Au1100 BA */
1213         case 0x02030202: /* Au1100 BC */
1214                 set_c0_config(1 << 19);
1215                 break;
1216         }
1217 }
1218
1219 static void __cpuinit coherency_setup(void)
1220 {
1221         change_c0_config(CONF_CM_CMASK, CONF_CM_DEFAULT);
1222
1223         /*
1224          * c0_status.cu=0 specifies that updates by the sc instruction use
1225          * the coherency mode specified by the TLB; 1 means cachable
1226          * coherent update on write will be used.  Not all processors have
1227          * this bit and; some wire it to zero, others like Toshiba had the
1228          * silly idea of putting something else there ...
1229          */
1230         switch (current_cpu_type()) {
1231         case CPU_R4000PC:
1232         case CPU_R4000SC:
1233         case CPU_R4000MC:
1234         case CPU_R4400PC:
1235         case CPU_R4400SC:
1236         case CPU_R4400MC:
1237                 clear_c0_config(CONF_CU);
1238                 break;
1239         /*
1240          * We need to catch the early Alchemy SOCs with
1241          * the write-only co_config.od bit and set it back to one...
1242          */
1243         case CPU_AU1000: /* rev. DA, HA, HB */
1244         case CPU_AU1100: /* rev. AB, BA, BC ?? */
1245         case CPU_AU1500: /* rev. AB */
1246                 au1x00_fixup_config_od();
1247                 break;
1248         }
1249 }
1250
1251 void __cpuinit r4k_cache_init(void)
1252 {
1253         extern void build_clear_page(void);
1254         extern void build_copy_page(void);
1255         extern char __weak except_vec2_generic;
1256         extern char __weak except_vec2_sb1;
1257         struct cpuinfo_mips *c = &current_cpu_data;
1258
1259         switch (c->cputype) {
1260         case CPU_SB1:
1261         case CPU_SB1A:
1262                 set_uncached_handler(0x100, &except_vec2_sb1, 0x80);
1263                 break;
1264
1265         default:
1266                 set_uncached_handler(0x100, &except_vec2_generic, 0x80);
1267                 break;
1268         }
1269
1270         probe_pcache();
1271         setup_scache();
1272
1273         r4k_blast_dcache_page_setup();
1274         r4k_blast_dcache_page_indexed_setup();
1275         r4k_blast_dcache_setup();
1276         r4k_blast_icache_page_setup();
1277         r4k_blast_icache_page_indexed_setup();
1278         r4k_blast_icache_setup();
1279         r4k_blast_scache_page_setup();
1280         r4k_blast_scache_page_indexed_setup();
1281         r4k_blast_scache_setup();
1282
1283         /*
1284          * Some MIPS32 and MIPS64 processors have physically indexed caches.
1285          * This code supports virtually indexed processors and will be
1286          * unnecessarily inefficient on physically indexed processors.
1287          */
1288         if (c->dcache.linesz)
1289                 shm_align_mask = max_t( unsigned long,
1290                                         c->dcache.sets * c->dcache.linesz - 1,
1291                                         PAGE_SIZE - 1);
1292         else
1293                 shm_align_mask = PAGE_SIZE-1;
1294
1295         __flush_cache_vmap      = r4k__flush_cache_vmap;
1296         __flush_cache_vunmap    = r4k__flush_cache_vunmap;
1297
1298         flush_cache_all         = cache_noop;
1299         __flush_cache_all       = r4k___flush_cache_all;
1300         flush_cache_mm          = r4k_flush_cache_mm;
1301         flush_cache_page        = r4k_flush_cache_page;
1302         flush_cache_range       = r4k_flush_cache_range;
1303
1304         flush_cache_sigtramp    = r4k_flush_cache_sigtramp;
1305         flush_icache_all        = r4k_flush_icache_all;
1306         local_flush_data_cache_page     = local_r4k_flush_data_cache_page;
1307         flush_data_cache_page   = r4k_flush_data_cache_page;
1308         flush_icache_range      = r4k_flush_icache_range;
1309
1310 #ifdef CONFIG_DMA_NONCOHERENT
1311         _dma_cache_wback_inv    = r4k_dma_cache_wback_inv;
1312         _dma_cache_wback        = r4k_dma_cache_wback_inv;
1313         _dma_cache_inv          = r4k_dma_cache_inv;
1314 #endif
1315
1316         build_clear_page();
1317         build_copy_page();
1318         local_r4k___flush_cache_all(NULL);
1319         coherency_setup();
1320 }