git.oblomov.eu Git - linux-2.6/blob - 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/module.h>
  18 #include <linux/bitops.h>
  19
  20 #include <asm/bcache.h>
  21 #include <asm/bootinfo.h>
  22 #include <asm/cache.h>
  23 #include <asm/cacheops.h>
  24 #include <asm/cpu.h>
  25 #include <asm/cpu-features.h>
  26 #include <asm/io.h>
  27 #include <asm/page.h>
  28 #include <asm/pgtable.h>
  29 #include <asm/r4kcache.h>
  30 #include <asm/sections.h>
  31 #include <asm/system.h>
  32 #include <asm/mmu_context.h>
  33 #include <asm/war.h>
  34 #include <asm/cacheflush.h> /* for run_uncached() */
  35
  36
  37 /*
  38  * Special Variant of smp_call_function for use by cache functions:
  39  *
  40  *  o No return value
  41  *  o collapses to normal function call on UP kernels
  42  *  o collapses to normal function call on systems with a single shared
  43  *    primary cache.
  44  */
  45 static inline void r4k_on_each_cpu(void (*func) (void *info), void *info,
  46                                    int retry, int wait)
  47 {
  48         preempt_disable();
  49
  50 #if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC)
  51         smp_call_function(func, info, retry, wait);
  52 #endif
  53         func(info);
  54         preempt_enable();
  55 }
  56
  57 #if defined(CONFIG_MIPS_CMP)
  58 #define cpu_has_safe_index_cacheops 0
  59 #else
  60 #define cpu_has_safe_index_cacheops 1
  61 #endif
  62
  63 /*
  64  * Must die.
  65  */
  66 static unsigned long icache_size __read_mostly;
  67 static unsigned long dcache_size __read_mostly;
  68 static unsigned long scache_size __read_mostly;
  69
  70 /*
  71  * Dummy cache handling routines for machines without boardcaches
  72  */
  73 static void cache_noop(void) {}
  74
  75 static struct bcache_ops no_sc_ops = {
  76         .bc_enable = (void *)cache_noop,
  77         .bc_disable = (void *)cache_noop,
  78         .bc_wback_inv = (void *)cache_noop,
  79         .bc_inv = (void *)cache_noop
  80 };
  81
  82 struct bcache_ops *bcops = &no_sc_ops;
  83
  84 #define cpu_is_r4600_v1_x()     ((read_c0_prid() & 0xfffffff0) == 0x00002010)
  85 #define cpu_is_r4600_v2_x()     ((read_c0_prid() & 0xfffffff0) == 0x00002020)
  86
  87 #define R4600_HIT_CACHEOP_WAR_IMPL                                      \
  88 do {                                                                    \
  89         if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x())            \
  90                 *(volatile unsigned long *)CKSEG1;                      \
  91         if (R4600_V1_HIT_CACHEOP_WAR)                                   \
  92                 __asm__ __volatile__("nop;nop;nop;nop");                \
  93 } while (0)
  94
  95 static void (*r4k_blast_dcache_page)(unsigned long addr);
  96
  97 static inline void r4k_blast_dcache_page_dc32(unsigned long addr)
  98 {
  99         R4600_HIT_CACHEOP_WAR_IMPL;
 100         blast_dcache32_page(addr);
 101 }
 102
 103 static void __cpuinit r4k_blast_dcache_page_setup(void)
 104 {
 105         unsigned long  dc_lsize = cpu_dcache_line_size();
 106
 107         if (dc_lsize == 0)
 108                 r4k_blast_dcache_page = (void *)cache_noop;
 109         else if (dc_lsize == 16)
 110                 r4k_blast_dcache_page = blast_dcache16_page;
 111         else if (dc_lsize == 32)
 112                 r4k_blast_dcache_page = r4k_blast_dcache_page_dc32;
 113 }
 114
 115 static void (* r4k_blast_dcache_page_indexed)(unsigned long addr);
 116
 117 static void __cpuinit r4k_blast_dcache_page_indexed_setup(void)
 118 {
 119         unsigned long dc_lsize = cpu_dcache_line_size();
 120
 121         if (dc_lsize == 0)
 122                 r4k_blast_dcache_page_indexed = (void *)cache_noop;
 123         else if (dc_lsize == 16)
 124                 r4k_blast_dcache_page_indexed = blast_dcache16_page_indexed;
 125         else if (dc_lsize == 32)
 126                 r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed;
 127 }
 128
 129 static void (* r4k_blast_dcache)(void);
 130
 131 static void __cpuinit r4k_blast_dcache_setup(void)
 132 {
 133         unsigned long dc_lsize = cpu_dcache_line_size();
 134
 135         if (dc_lsize == 0)
 136                 r4k_blast_dcache = (void *)cache_noop;
 137         else if (dc_lsize == 16)
 138                 r4k_blast_dcache = blast_dcache16;
 139         else if (dc_lsize == 32)
 140                 r4k_blast_dcache = blast_dcache32;
 141 }
 142
 143 /* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
 144 #define JUMP_TO_ALIGN(order) \
 145         __asm__ __volatile__( \
 146                 "b\t1f\n\t" \
 147                 ".align\t" #order "\n\t" \
 148                 "1:\n\t" \
 149                 )
 150 #define CACHE32_UNROLL32_ALIGN  JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
 151 #define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
 152
 153 static inline void blast_r4600_v1_icache32(void)
 154 {
 155         unsigned long flags;
 156
 157         local_irq_save(flags);
 158         blast_icache32();
 159         local_irq_restore(flags);
 160 }
 161
 162 static inline void tx49_blast_icache32(void)
 163 {
 164         unsigned long start = INDEX_BASE;
 165         unsigned long end = start + current_cpu_data.icache.waysize;
 166         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 167         unsigned long ws_end = current_cpu_data.icache.ways <<
 168                                current_cpu_data.icache.waybit;
 169         unsigned long ws, addr;
 170
 171         CACHE32_UNROLL32_ALIGN2;
 172         /* I'm in even chunk.  blast odd chunks */
 173         for (ws = 0; ws < ws_end; ws += ws_inc)
 174                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 175                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 176         CACHE32_UNROLL32_ALIGN;
 177         /* I'm in odd chunk.  blast even chunks */
 178         for (ws = 0; ws < ws_end; ws += ws_inc)
 179                 for (addr = start; addr < end; addr += 0x400 * 2)
 180                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 181 }
 182
 183 static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page)
 184 {
 185         unsigned long flags;
 186
 187         local_irq_save(flags);
 188         blast_icache32_page_indexed(page);
 189         local_irq_restore(flags);
 190 }
 191
 192 static inline void tx49_blast_icache32_page_indexed(unsigned long page)
 193 {
 194         unsigned long indexmask = current_cpu_data.icache.waysize - 1;
 195         unsigned long start = INDEX_BASE + (page & indexmask);
 196         unsigned long end = start + PAGE_SIZE;
 197         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 198         unsigned long ws_end = current_cpu_data.icache.ways <<
 199                                current_cpu_data.icache.waybit;
 200         unsigned long ws, addr;
 201
 202         CACHE32_UNROLL32_ALIGN2;
 203         /* I'm in even chunk.  blast odd chunks */
 204         for (ws = 0; ws < ws_end; ws += ws_inc)
 205                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 206                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 207         CACHE32_UNROLL32_ALIGN;
 208         /* I'm in odd chunk.  blast even chunks */
 209         for (ws = 0; ws < ws_end; ws += ws_inc)
 210                 for (addr = start; addr < end; addr += 0x400 * 2)
 211                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 212 }
 213
 214 static void (* r4k_blast_icache_page)(unsigned long addr);
 215
 216 static void __cpuinit r4k_blast_icache_page_setup(void)
 217 {
 218         unsigned long ic_lsize = cpu_icache_line_size();
 219
 220         if (ic_lsize == 0)
 221                 r4k_blast_icache_page = (void *)cache_noop;
 222         else if (ic_lsize == 16)
 223                 r4k_blast_icache_page = blast_icache16_page;
 224         else if (ic_lsize == 32)
 225                 r4k_blast_icache_page = blast_icache32_page;
 226         else if (ic_lsize == 64)
 227                 r4k_blast_icache_page = blast_icache64_page;
 228 }
 229
 230
 231 static void (* r4k_blast_icache_page_indexed)(unsigned long addr);
 232
 233 static void __cpuinit r4k_blast_icache_page_indexed_setup(void)
 234 {
 235         unsigned long ic_lsize = cpu_icache_line_size();
 236
 237         if (ic_lsize == 0)
 238                 r4k_blast_icache_page_indexed = (void *)cache_noop;
 239         else if (ic_lsize == 16)
 240                 r4k_blast_icache_page_indexed = blast_icache16_page_indexed;
 241         else if (ic_lsize == 32) {
 242                 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
 243                         r4k_blast_icache_page_indexed =
 244                                 blast_icache32_r4600_v1_page_indexed;
 245                 else if (TX49XX_ICACHE_INDEX_INV_WAR)
 246                         r4k_blast_icache_page_indexed =
 247                                 tx49_blast_icache32_page_indexed;
 248                 else
 249                         r4k_blast_icache_page_indexed =
 250                                 blast_icache32_page_indexed;
 251         } else if (ic_lsize == 64)
 252                 r4k_blast_icache_page_indexed = blast_icache64_page_indexed;
 253 }
 254
 255 static void (* r4k_blast_icache)(void);
 256
 257 static void __cpuinit r4k_blast_icache_setup(void)
 258 {
 259         unsigned long ic_lsize = cpu_icache_line_size();
 260
 261         if (ic_lsize == 0)
 262                 r4k_blast_icache = (void *)cache_noop;
 263         else if (ic_lsize == 16)
 264                 r4k_blast_icache = blast_icache16;
 265         else if (ic_lsize == 32) {
 266                 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
 267                         r4k_blast_icache = blast_r4600_v1_icache32;
 268                 else if (TX49XX_ICACHE_INDEX_INV_WAR)
 269                         r4k_blast_icache = tx49_blast_icache32;
 270                 else
 271                         r4k_blast_icache = blast_icache32;
 272         } else if (ic_lsize == 64)
 273                 r4k_blast_icache = blast_icache64;
 274 }
 275
 276 static void (* r4k_blast_scache_page)(unsigned long addr);
 277
 278 static void __cpuinit r4k_blast_scache_page_setup(void)
 279 {
 280         unsigned long sc_lsize = cpu_scache_line_size();
 281
 282         if (scache_size == 0)
 283                 r4k_blast_scache_page = (void *)cache_noop;
 284         else if (sc_lsize == 16)
 285                 r4k_blast_scache_page = blast_scache16_page;
 286         else if (sc_lsize == 32)
 287                 r4k_blast_scache_page = blast_scache32_page;
 288         else if (sc_lsize == 64)
 289                 r4k_blast_scache_page = blast_scache64_page;
 290         else if (sc_lsize == 128)
 291                 r4k_blast_scache_page = blast_scache128_page;
 292 }
 293
 294 static void (* r4k_blast_scache_page_indexed)(unsigned long addr);
 295
 296 static void __cpuinit r4k_blast_scache_page_indexed_setup(void)
 297 {
 298         unsigned long sc_lsize = cpu_scache_line_size();
 299
 300         if (scache_size == 0)
 301                 r4k_blast_scache_page_indexed = (void *)cache_noop;
 302         else if (sc_lsize == 16)
 303                 r4k_blast_scache_page_indexed = blast_scache16_page_indexed;
 304         else if (sc_lsize == 32)
 305                 r4k_blast_scache_page_indexed = blast_scache32_page_indexed;
 306         else if (sc_lsize == 64)
 307                 r4k_blast_scache_page_indexed = blast_scache64_page_indexed;
 308         else if (sc_lsize == 128)
 309                 r4k_blast_scache_page_indexed = blast_scache128_page_indexed;
 310 }
 311
 312 static void (* r4k_blast_scache)(void);
 313
 314 static void __cpuinit r4k_blast_scache_setup(void)
 315 {
 316         unsigned long sc_lsize = cpu_scache_line_size();
 317
 318         if (scache_size == 0)
 319                 r4k_blast_scache = (void *)cache_noop;
 320         else if (sc_lsize == 16)
 321                 r4k_blast_scache = blast_scache16;
 322         else if (sc_lsize == 32)
 323                 r4k_blast_scache = blast_scache32;
 324         else if (sc_lsize == 64)
 325                 r4k_blast_scache = blast_scache64;
 326         else if (sc_lsize == 128)
 327                 r4k_blast_scache = blast_scache128;
 328 }
 329
 330 static inline void local_r4k___flush_cache_all(void * args)
 331 {
 332 #if defined(CONFIG_CPU_LOONGSON2)
 333         r4k_blast_scache();
 334         return;
 335 #endif
 336         r4k_blast_dcache();
 337         r4k_blast_icache();
 338
 339         switch (current_cpu_type()) {
 340         case CPU_R4000SC:
 341         case CPU_R4000MC:
 342         case CPU_R4400SC:
 343         case CPU_R4400MC:
 344         case CPU_R10000:
 345         case CPU_R12000:
 346         case CPU_R14000:
 347                 r4k_blast_scache();
 348         }
 349 }
 350
 351 static void r4k___flush_cache_all(void)
 352 {
 353         r4k_on_each_cpu(local_r4k___flush_cache_all, NULL, 1, 1);
 354 }
 355
 356 static inline int has_valid_asid(const struct mm_struct *mm)
 357 {
 358 #if defined(CONFIG_MIPS_MT_SMP) || defined(CONFIG_MIPS_MT_SMTC)
 359         int i;
 360
 361         for_each_online_cpu(i)
 362                 if (cpu_context(i, mm))
 363                         return 1;
 364
 365         return 0;
 366 #else
 367         return cpu_context(smp_processor_id(), mm);
 368 #endif
 369 }
 370
 371 static void r4k__flush_cache_vmap(void)
 372 {
 373         r4k_blast_dcache();
 374 }
 375
 376 static void r4k__flush_cache_vunmap(void)
 377 {
 378         r4k_blast_dcache();
 379 }
 380
 381 static inline void local_r4k_flush_cache_range(void * args)
 382 {
 383         struct vm_area_struct *vma = args;
 384         int exec = vma->vm_flags & VM_EXEC;
 385
 386         if (!(has_valid_asid(vma->vm_mm)))
 387                 return;
 388
 389         r4k_blast_dcache();
 390         if (exec)
 391                 r4k_blast_icache();
 392 }
 393
 394 static void r4k_flush_cache_range(struct vm_area_struct *vma,
 395         unsigned long start, unsigned long end)
 396 {
 397         int exec = vma->vm_flags & VM_EXEC;
 398
 399         if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc))
 400                 r4k_on_each_cpu(local_r4k_flush_cache_range, vma, 1, 1);
 401 }
 402
 403 static inline void local_r4k_flush_cache_mm(void * args)
 404 {
 405         struct mm_struct *mm = args;
 406
 407         if (!has_valid_asid(mm))
 408                 return;
 409
 410         /*
 411          * Kludge alert.  For obscure reasons R4000SC and R4400SC go nuts if we
 412          * only flush the primary caches but R10000 and R12000 behave sane ...
 413          * R4000SC and R4400SC indexed S-cache ops also invalidate primary
 414          * caches, so we can bail out early.
 415          */
 416         if (current_cpu_type() == CPU_R4000SC ||
 417             current_cpu_type() == CPU_R4000MC ||
 418             current_cpu_type() == CPU_R4400SC ||
 419             current_cpu_type() == CPU_R4400MC) {
 420                 r4k_blast_scache();
 421                 return;
 422         }
 423
 424         r4k_blast_dcache();
 425 }
 426
 427 static void r4k_flush_cache_mm(struct mm_struct *mm)
 428 {
 429         if (!cpu_has_dc_aliases)
 430                 return;
 431
 432         r4k_on_each_cpu(local_r4k_flush_cache_mm, mm, 1, 1);
 433 }
 434
 435 struct flush_cache_page_args {
 436         struct vm_area_struct *vma;
 437         unsigned long addr;
 438         unsigned long pfn;
 439 };
 440
 441 static inline void local_r4k_flush_cache_page(void *args)
 442 {
 443         struct flush_cache_page_args *fcp_args = args;
 444         struct vm_area_struct *vma = fcp_args->vma;
 445         unsigned long addr = fcp_args->addr;
 446         struct page *page = pfn_to_page(fcp_args->pfn);
 447         int exec = vma->vm_flags & VM_EXEC;
 448         struct mm_struct *mm = vma->vm_mm;
 449         int map_coherent = 0;
 450         pgd_t *pgdp;
 451         pud_t *pudp;
 452         pmd_t *pmdp;
 453         pte_t *ptep;
 454         void *vaddr;
 455
 456         /*
 457          * If ownes no valid ASID yet, cannot possibly have gotten
 458          * this page into the cache.
 459          */
 460         if (!has_valid_asid(mm))
 461                 return;
 462
 463         addr &= PAGE_MASK;
 464         pgdp = pgd_offset(mm, addr);
 465         pudp = pud_offset(pgdp, addr);
 466         pmdp = pmd_offset(pudp, addr);
 467         ptep = pte_offset(pmdp, addr);
 468
 469         /*
 470          * If the page isn't marked valid, the page cannot possibly be
 471          * in the cache.
 472          */
 473         if (!(pte_present(*ptep)))
 474                 return;
 475
 476         if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID))
 477                 vaddr = NULL;
 478         else {
 479                 /*
 480                  * Use kmap_coherent or kmap_atomic to do flushes for
 481                  * another ASID than the current one.
 482                  */
 483                 map_coherent = (cpu_has_dc_aliases &&
 484                                 page_mapped(page) && !Page_dcache_dirty(page));
 485                 if (map_coherent)
 486                         vaddr = kmap_coherent(page, addr);
 487                 else
 488                         vaddr = kmap_atomic(page, KM_USER0);
 489                 addr = (unsigned long)vaddr;
 490         }
 491
 492         if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
 493                 r4k_blast_dcache_page(addr);
 494                 if (exec && !cpu_icache_snoops_remote_store)
 495                         r4k_blast_scache_page(addr);
 496         }
 497         if (exec) {
 498                 if (vaddr && cpu_has_vtag_icache && mm == current->active_mm) {
 499                         int cpu = smp_processor_id();
 500
 501                         if (cpu_context(cpu, mm) != 0)
 502                                 drop_mmu_context(mm, cpu);
 503                 } else
 504                         r4k_blast_icache_page(addr);
 505         }
 506
 507         if (vaddr) {
 508                 if (map_coherent)
 509                         kunmap_coherent();
 510                 else
 511                         kunmap_atomic(vaddr, KM_USER0);
 512         }
 513 }
 514
 515 static void r4k_flush_cache_page(struct vm_area_struct *vma,
 516         unsigned long addr, unsigned long pfn)
 517 {
 518         struct flush_cache_page_args args;
 519
 520         args.vma = vma;
 521         args.addr = addr;
 522         args.pfn = pfn;
 523
 524         r4k_on_each_cpu(local_r4k_flush_cache_page, &args, 1, 1);
 525 }
 526
 527 static inline void local_r4k_flush_data_cache_page(void * addr)
 528 {
 529         r4k_blast_dcache_page((unsigned long) addr);
 530 }
 531
 532 static void r4k_flush_data_cache_page(unsigned long addr)
 533 {
 534         if (in_atomic())
 535                 local_r4k_flush_data_cache_page((void *)addr);
 536         else
 537                 r4k_on_each_cpu(local_r4k_flush_data_cache_page, (void *) addr,
 538                                 1, 1);
 539 }
 540
 541 struct flush_icache_range_args {
 542         unsigned long start;
 543         unsigned long end;
 544 };
 545
 546 static inline void local_r4k_flush_icache_range(void *args)
 547 {
 548         struct flush_icache_range_args *fir_args = args;
 549         unsigned long start = fir_args->start;
 550         unsigned long end = fir_args->end;
 551
 552         if (!cpu_has_ic_fills_f_dc) {
 553                 if (end - start >= dcache_size) {
 554                         r4k_blast_dcache();
 555                 } else {
 556                         R4600_HIT_CACHEOP_WAR_IMPL;
 557                         protected_blast_dcache_range(start, end);
 558                 }
 559         }
 560
 561         if (end - start > icache_size)
 562                 r4k_blast_icache();
 563         else
 564                 protected_blast_icache_range(start, end);
 565 }
 566
 567 static void r4k_flush_icache_range(unsigned long start, unsigned long end)
 568 {
 569         struct flush_icache_range_args args;
 570
 571         args.start = start;
 572         args.end = end;
 573
 574         r4k_on_each_cpu(local_r4k_flush_icache_range, &args, 1, 1);
 575         instruction_hazard();
 576 }
 577
 578 #ifdef CONFIG_DMA_NONCOHERENT
 579
 580 static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
 581 {
 582         /* Catch bad driver code */
 583         BUG_ON(size == 0);
 584
 585         if (cpu_has_inclusive_pcaches) {
 586                 if (size >= scache_size)
 587                         r4k_blast_scache();
 588                 else
 589                         blast_scache_range(addr, addr + size);
 590                 return;
 591         }
 592
 593         /*
 594          * Either no secondary cache or the available caches don't have the
 595          * subset property so we have to flush the primary caches
 596          * explicitly
 597          */
 598         if (cpu_has_safe_index_cacheops && size >= dcache_size) {
 599                 r4k_blast_dcache();
 600         } else {
 601                 R4600_HIT_CACHEOP_WAR_IMPL;
 602                 blast_dcache_range(addr, addr + size);
 603         }
 604
 605         bc_wback_inv(addr, size);
 606 }
 607
 608 static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
 609 {
 610         /* Catch bad driver code */
 611         BUG_ON(size == 0);
 612
 613         if (cpu_has_inclusive_pcaches) {
 614                 if (size >= scache_size)
 615                         r4k_blast_scache();
 616                 else
 617                         blast_inv_scache_range(addr, addr + size);
 618                 return;
 619         }
 620
 621         if (cpu_has_safe_index_cacheops && size >= dcache_size) {
 622                 r4k_blast_dcache();
 623         } else {
 624                 R4600_HIT_CACHEOP_WAR_IMPL;
 625                 blast_inv_dcache_range(addr, addr + size);
 626         }
 627
 628         bc_inv(addr, size);
 629 }
 630 #endif /* CONFIG_DMA_NONCOHERENT */
 631
 632 /*
 633  * While we're protected against bad userland addresses we don't care
 634  * very much about what happens in that case.  Usually a segmentation
 635  * fault will dump the process later on anyway ...
 636  */
 637 static void local_r4k_flush_cache_sigtramp(void * arg)
 638 {
 639         unsigned long ic_lsize = cpu_icache_line_size();
 640         unsigned long dc_lsize = cpu_dcache_line_size();
 641         unsigned long sc_lsize = cpu_scache_line_size();
 642         unsigned long addr = (unsigned long) arg;
 643
 644         R4600_HIT_CACHEOP_WAR_IMPL;
 645         if (dc_lsize)
 646                 protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
 647         if (!cpu_icache_snoops_remote_store && scache_size)
 648                 protected_writeback_scache_line(addr & ~(sc_lsize - 1));
 649         if (ic_lsize)
 650                 protected_flush_icache_line(addr & ~(ic_lsize - 1));
 651         if (MIPS4K_ICACHE_REFILL_WAR) {
 652                 __asm__ __volatile__ (
 653                         ".set push\n\t"
 654                         ".set noat\n\t"
 655                         ".set mips3\n\t"
 656 #ifdef CONFIG_32BIT
 657                         "la     $at,1f\n\t"
 658 #endif
 659 #ifdef CONFIG_64BIT
 660                         "dla    $at,1f\n\t"
 661 #endif
 662                         "cache  %0,($at)\n\t"
 663                         "nop; nop; nop\n"
 664                         "1:\n\t"
 665                         ".set pop"
 666                         :
 667                         : "i" (Hit_Invalidate_I));
 668         }
 669         if (MIPS_CACHE_SYNC_WAR)
 670                 __asm__ __volatile__ ("sync");
 671 }
 672
 673 static void r4k_flush_cache_sigtramp(unsigned long addr)
 674 {
 675         r4k_on_each_cpu(local_r4k_flush_cache_sigtramp, (void *) addr, 1, 1);
 676 }
 677
 678 static void r4k_flush_icache_all(void)
 679 {
 680         if (cpu_has_vtag_icache)
 681                 r4k_blast_icache();
 682 }
 683
 684 static inline void rm7k_erratum31(void)
 685 {
 686         const unsigned long ic_lsize = 32;
 687         unsigned long addr;
 688
 689         /* RM7000 erratum #31. The icache is screwed at startup. */
 690         write_c0_taglo(0);
 691         write_c0_taghi(0);
 692
 693         for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) {
 694                 __asm__ __volatile__ (
 695                         ".set push\n\t"
 696                         ".set noreorder\n\t"
 697                         ".set mips3\n\t"
 698                         "cache\t%1, 0(%0)\n\t"
 699                         "cache\t%1, 0x1000(%0)\n\t"
 700                         "cache\t%1, 0x2000(%0)\n\t"
 701                         "cache\t%1, 0x3000(%0)\n\t"
 702                         "cache\t%2, 0(%0)\n\t"
 703                         "cache\t%2, 0x1000(%0)\n\t"
 704                         "cache\t%2, 0x2000(%0)\n\t"
 705                         "cache\t%2, 0x3000(%0)\n\t"
 706                         "cache\t%1, 0(%0)\n\t"
 707                         "cache\t%1, 0x1000(%0)\n\t"
 708                         "cache\t%1, 0x2000(%0)\n\t"
 709                         "cache\t%1, 0x3000(%0)\n\t"
 710                         ".set pop\n"
 711                         :
 712                         : "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill));
 713         }
 714 }
 715
 716 static char *way_string[] __cpuinitdata = { NULL, "direct mapped", "2-way",
 717         "3-way", "4-way", "5-way", "6-way", "7-way", "8-way"
 718 };
 719
 720 static void __cpuinit probe_pcache(void)
 721 {
 722         struct cpuinfo_mips *c = &current_cpu_data;
 723         unsigned int config = read_c0_config();
 724         unsigned int prid = read_c0_prid();
 725         unsigned long config1;
 726         unsigned int lsize;
 727
 728         switch (c->cputype) {
 729         case CPU_R4600:                 /* QED style two way caches? */
 730         case CPU_R4700:
 731         case CPU_R5000:
 732         case CPU_NEVADA:
 733                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 734                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 735                 c->icache.ways = 2;
 736                 c->icache.waybit = __ffs(icache_size/2);
 737
 738                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 739                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 740                 c->dcache.ways = 2;
 741                 c->dcache.waybit= __ffs(dcache_size/2);
 742
 743                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 744                 break;
 745
 746         case CPU_R5432:
 747         case CPU_R5500:
 748                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 749                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 750                 c->icache.ways = 2;
 751                 c->icache.waybit= 0;
 752
 753                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 754                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 755                 c->dcache.ways = 2;
 756                 c->dcache.waybit = 0;
 757
 758                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 759                 break;
 760
 761         case CPU_TX49XX:
 762                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 763                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 764                 c->icache.ways = 4;
 765                 c->icache.waybit= 0;
 766
 767                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 768                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 769                 c->dcache.ways = 4;
 770                 c->dcache.waybit = 0;
 771
 772                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 773                 c->options |= MIPS_CPU_PREFETCH;
 774                 break;
 775
 776         case CPU_R4000PC:
 777         case CPU_R4000SC:
 778         case CPU_R4000MC:
 779         case CPU_R4400PC:
 780         case CPU_R4400SC:
 781         case CPU_R4400MC:
 782         case CPU_R4300:
 783                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 784                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 785                 c->icache.ways = 1;
 786                 c->icache.waybit = 0;   /* doesn't matter */
 787
 788                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 789                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 790                 c->dcache.ways = 1;
 791                 c->dcache.waybit = 0;   /* does not matter */
 792
 793                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 794                 break;
 795
 796         case CPU_R10000:
 797         case CPU_R12000:
 798         case CPU_R14000:
 799                 icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29));
 800                 c->icache.linesz = 64;
 801                 c->icache.ways = 2;
 802                 c->icache.waybit = 0;
 803
 804                 dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26));
 805                 c->dcache.linesz = 32;
 806                 c->dcache.ways = 2;
 807                 c->dcache.waybit = 0;
 808
 809                 c->options |= MIPS_CPU_PREFETCH;
 810                 break;
 811
 812         case CPU_VR4133:
 813                 write_c0_config(config & ~VR41_CONF_P4K);
 814         case CPU_VR4131:
 815                 /* Workaround for cache instruction bug of VR4131 */
 816                 if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U ||
 817                     c->processor_id == 0x0c82U) {
 818                         config |= 0x00400000U;
 819                         if (c->processor_id == 0x0c80U)
 820                                 config |= VR41_CONF_BP;
 821                         write_c0_config(config);
 822                 } else
 823                         c->options |= MIPS_CPU_CACHE_CDEX_P;
 824
 825                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
 826                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 827                 c->icache.ways = 2;
 828                 c->icache.waybit = __ffs(icache_size/2);
 829
 830                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
 831                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 832                 c->dcache.ways = 2;
 833                 c->dcache.waybit = __ffs(dcache_size/2);
 834                 break;
 835
 836         case CPU_VR41XX:
 837         case CPU_VR4111:
 838         case CPU_VR4121:
 839         case CPU_VR4122:
 840         case CPU_VR4181:
 841         case CPU_VR4181A:
 842                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
 843                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 844                 c->icache.ways = 1;
 845                 c->icache.waybit = 0;   /* doesn't matter */
 846
 847                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
 848                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 849                 c->dcache.ways = 1;
 850                 c->dcache.waybit = 0;   /* does not matter */
 851
 852                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 853                 break;
 854
 855         case CPU_RM7000:
 856                 rm7k_erratum31();
 857
 858         case CPU_RM9000:
 859                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 860                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 861                 c->icache.ways = 4;
 862                 c->icache.waybit = __ffs(icache_size / c->icache.ways);
 863
 864                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 865                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 866                 c->dcache.ways = 4;
 867                 c->dcache.waybit = __ffs(dcache_size / c->dcache.ways);
 868
 869 #if !defined(CONFIG_SMP) || !defined(RM9000_CDEX_SMP_WAR)
 870                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 871 #endif
 872                 c->options |= MIPS_CPU_PREFETCH;
 873                 break;
 874
 875         case CPU_LOONGSON2:
 876                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 877                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 878                 if (prid & 0x3)
 879                         c->icache.ways = 4;
 880                 else
 881                         c->icache.ways = 2;
 882                 c->icache.waybit = 0;
 883
 884                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 885                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 886                 if (prid & 0x3)
 887                         c->dcache.ways = 4;
 888                 else
 889                         c->dcache.ways = 2;
 890                 c->dcache.waybit = 0;
 891                 break;
 892
 893         default:
 894                 if (!(config & MIPS_CONF_M))
 895                         panic("Don't know how to probe P-caches on this cpu.");
 896
 897                 /*
 898                  * So we seem to be a MIPS32 or MIPS64 CPU
 899                  * So let's probe the I-cache ...
 900                  */
 901                 config1 = read_c0_config1();
 902
 903                 if ((lsize = ((config1 >> 19) & 7)))
 904                         c->icache.linesz = 2 << lsize;
 905                 else
 906                         c->icache.linesz = lsize;
 907                 c->icache.sets = 64 << ((config1 >> 22) & 7);
 908                 c->icache.ways = 1 + ((config1 >> 16) & 7);
 909
 910                 icache_size = c->icache.sets *
 911                               c->icache.ways *
 912                               c->icache.linesz;
 913                 c->icache.waybit = __ffs(icache_size/c->icache.ways);
 914
 915                 if (config & 0x8)               /* VI bit */
 916                         c->icache.flags |= MIPS_CACHE_VTAG;
 917
 918                 /*
 919                  * Now probe the MIPS32 / MIPS64 data cache.
 920                  */
 921                 c->dcache.flags = 0;
 922
 923                 if ((lsize = ((config1 >> 10) & 7)))
 924                         c->dcache.linesz = 2 << lsize;
 925                 else
 926                         c->dcache.linesz= lsize;
 927                 c->dcache.sets = 64 << ((config1 >> 13) & 7);
 928                 c->dcache.ways = 1 + ((config1 >> 7) & 7);
 929
 930                 dcache_size = c->dcache.sets *
 931                               c->dcache.ways *
 932                               c->dcache.linesz;
 933                 c->dcache.waybit = __ffs(dcache_size/c->dcache.ways);
 934
 935                 c->options |= MIPS_CPU_PREFETCH;
 936                 break;
 937         }
 938
 939         /*
 940          * Processor configuration sanity check for the R4000SC erratum
 941          * #5.  With page sizes larger than 32kB there is no possibility
 942          * to get a VCE exception anymore so we don't care about this
 943          * misconfiguration.  The case is rather theoretical anyway;
 944          * presumably no vendor is shipping his hardware in the "bad"
 945          * configuration.
 946          */
 947         if ((prid & 0xff00) == PRID_IMP_R4000 && (prid & 0xff) < 0x40 &&
 948             !(config & CONF_SC) && c->icache.linesz != 16 &&
 949             PAGE_SIZE <= 0x8000)
 950                 panic("Improper R4000SC processor configuration detected");
 951
 952         /* compute a couple of other cache variables */
 953         c->icache.waysize = icache_size / c->icache.ways;
 954         c->dcache.waysize = dcache_size / c->dcache.ways;
 955
 956         c->icache.sets = c->icache.linesz ?
 957                 icache_size / (c->icache.linesz * c->icache.ways) : 0;
 958         c->dcache.sets = c->dcache.linesz ?
 959                 dcache_size / (c->dcache.linesz * c->dcache.ways) : 0;
 960
 961         /*
 962          * R10000 and R12000 P-caches are odd in a positive way.  They're 32kB
 963          * 2-way virtually indexed so normally would suffer from aliases.  So
 964          * normally they'd suffer from aliases but magic in the hardware deals
 965          * with that for us so we don't need to take care ourselves.
 966          */
 967         switch (c->cputype) {
 968         case CPU_20KC:
 969         case CPU_25KF:
 970         case CPU_SB1:
 971         case CPU_SB1A:
 972                 c->dcache.flags |= MIPS_CACHE_PINDEX;
 973                 break;
 974
 975         case CPU_R10000:
 976         case CPU_R12000:
 977         case CPU_R14000:
 978                 break;
 979
 980         case CPU_24K:
 981         case CPU_34K:
 982         case CPU_74K:
 983         case CPU_1004K:
 984                 if ((read_c0_config7() & (1 << 16))) {
 985                         /* effectively physically indexed dcache,
 986                            thus no virtual aliases. */
 987                         c->dcache.flags |= MIPS_CACHE_PINDEX;
 988                         break;
 989                 }
 990         default:
 991                 if (c->dcache.waysize > PAGE_SIZE)
 992                         c->dcache.flags |= MIPS_CACHE_ALIASES;
 993         }
 994
 995         switch (c->cputype) {
 996         case CPU_20KC:
 997                 /*
 998                  * Some older 20Kc chips doesn't have the 'VI' bit in
 999                  * the config register.
1000                  */
1001                 c->icache.flags |= MIPS_CACHE_VTAG;
1002                 break;
1003
1004         case CPU_AU1000:
1005         case CPU_AU1500:
1006         case CPU_AU1100:
1007         case CPU_AU1550:
1008         case CPU_AU1200:
1009         case CPU_AU1210:
1010         case CPU_AU1250:
1011                 c->icache.flags |= MIPS_CACHE_IC_F_DC;
1012                 break;
1013         }
1014
1015 #ifdef  CONFIG_CPU_LOONGSON2
1016         /*
1017          * LOONGSON2 has 4 way icache, but when using indexed cache op,
1018          * one op will act on all 4 ways
1019          */
1020         c->icache.ways = 1;
1021 #endif
1022
1023         printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
1024                icache_size >> 10,
1025                cpu_has_vtag_icache ? "VIVT" : "VIPT",
1026                way_string[c->icache.ways], c->icache.linesz);
1027
1028         printk("Primary data cache %ldkB, %s, %s, %s, linesize %d bytes\n",
1029                dcache_size >> 10, way_string[c->dcache.ways],
1030                (c->dcache.flags & MIPS_CACHE_PINDEX) ? "PIPT" : "VIPT",
1031                (c->dcache.flags & MIPS_CACHE_ALIASES) ?
1032                         "cache aliases" : "no aliases",
1033                c->dcache.linesz);
1034 }
1035
1036 /*
1037  * If you even _breathe_ on this function, look at the gcc output and make sure
1038  * it does not pop things on and off the stack for the cache sizing loop that
1039  * executes in KSEG1 space or else you will crash and burn badly.  You have
1040  * been warned.
1041  */
1042 static int __cpuinit probe_scache(void)
1043 {
1044         unsigned long flags, addr, begin, end, pow2;
1045         unsigned int config = read_c0_config();
1046         struct cpuinfo_mips *c = &current_cpu_data;
1047         int tmp;
1048
1049         if (config & CONF_SC)
1050                 return 0;
1051
1052         begin = (unsigned long) &_stext;
1053         begin &= ~((4 * 1024 * 1024) - 1);
1054         end = begin + (4 * 1024 * 1024);
1055
1056         /*
1057          * This is such a bitch, you'd think they would make it easy to do
1058          * this.  Away you daemons of stupidity!
1059          */
1060         local_irq_save(flags);
1061
1062         /* Fill each size-multiple cache line with a valid tag. */
1063         pow2 = (64 * 1024);
1064         for (addr = begin; addr < end; addr = (begin + pow2)) {
1065                 unsigned long *p = (unsigned long *) addr;
1066                 __asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
1067                 pow2 <<= 1;
1068         }
1069
1070         /* Load first line with zero (therefore invalid) tag. */
1071         write_c0_taglo(0);
1072         write_c0_taghi(0);
1073         __asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
1074         cache_op(Index_Store_Tag_I, begin);
1075         cache_op(Index_Store_Tag_D, begin);
1076         cache_op(Index_Store_Tag_SD, begin);
1077
1078         /* Now search for the wrap around point. */
1079         pow2 = (128 * 1024);
1080         tmp = 0;
1081         for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) {
1082                 cache_op(Index_Load_Tag_SD, addr);
1083                 __asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
1084                 if (!read_c0_taglo())
1085                         break;
1086                 pow2 <<= 1;
1087         }
1088         local_irq_restore(flags);
1089         addr -= begin;
1090
1091         scache_size = addr;
1092         c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22);
1093         c->scache.ways = 1;
1094         c->dcache.waybit = 0;           /* does not matter */
1095
1096         return 1;
1097 }
1098
1099 #if defined(CONFIG_CPU_LOONGSON2)
1100 static void __init loongson2_sc_init(void)
1101 {
1102         struct cpuinfo_mips *c = &current_cpu_data;
1103
1104         scache_size = 512*1024;
1105         c->scache.linesz = 32;
1106         c->scache.ways = 4;
1107         c->scache.waybit = 0;
1108         c->scache.waysize = scache_size / (c->scache.ways);
1109         c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1110         pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1111                scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1112
1113         c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1114 }
1115 #endif
1116
1117 extern int r5k_sc_init(void);
1118 extern int rm7k_sc_init(void);
1119 extern int mips_sc_init(void);
1120
1121 static void __cpuinit setup_scache(void)
1122 {
1123         struct cpuinfo_mips *c = &current_cpu_data;
1124         unsigned int config = read_c0_config();
1125         int sc_present = 0;
1126
1127         /*
1128          * Do the probing thing on R4000SC and R4400SC processors.  Other
1129          * processors don't have a S-cache that would be relevant to the
1130          * Linux memory management.
1131          */
1132         switch (c->cputype) {
1133         case CPU_R4000SC:
1134         case CPU_R4000MC:
1135         case CPU_R4400SC:
1136         case CPU_R4400MC:
1137                 sc_present = run_uncached(probe_scache);
1138                 if (sc_present)
1139                         c->options |= MIPS_CPU_CACHE_CDEX_S;
1140                 break;
1141
1142         case CPU_R10000:
1143         case CPU_R12000:
1144         case CPU_R14000:
1145                 scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16);
1146                 c->scache.linesz = 64 << ((config >> 13) & 1);
1147                 c->scache.ways = 2;
1148                 c->scache.waybit= 0;
1149                 sc_present = 1;
1150                 break;
1151
1152         case CPU_R5000:
1153         case CPU_NEVADA:
1154 #ifdef CONFIG_R5000_CPU_SCACHE
1155                 r5k_sc_init();
1156 #endif
1157                 return;
1158
1159         case CPU_RM7000:
1160         case CPU_RM9000:
1161 #ifdef CONFIG_RM7000_CPU_SCACHE
1162                 rm7k_sc_init();
1163 #endif
1164                 return;
1165
1166 #if defined(CONFIG_CPU_LOONGSON2)
1167         case CPU_LOONGSON2:
1168                 loongson2_sc_init();
1169                 return;
1170 #endif
1171
1172         default:
1173                 if (c->isa_level == MIPS_CPU_ISA_M32R1 ||
1174                     c->isa_level == MIPS_CPU_ISA_M32R2 ||
1175                     c->isa_level == MIPS_CPU_ISA_M64R1 ||
1176                     c->isa_level == MIPS_CPU_ISA_M64R2) {
1177 #ifdef CONFIG_MIPS_CPU_SCACHE
1178                         if (mips_sc_init ()) {
1179                                 scache_size = c->scache.ways * c->scache.sets * c->scache.linesz;
1180                                 printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n",
1181                                        scache_size >> 10,
1182                                        way_string[c->scache.ways], c->scache.linesz);
1183                         }
1184 #else
1185                         if (!(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
1186                                 panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
1187 #endif
1188                         return;
1189                 }
1190                 sc_present = 0;
1191         }
1192
1193         if (!sc_present)
1194                 return;
1195
1196         /* compute a couple of other cache variables */
1197         c->scache.waysize = scache_size / c->scache.ways;
1198
1199         c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1200
1201         printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1202                scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1203
1204         c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1205 }
1206
1207 void au1x00_fixup_config_od(void)
1208 {
1209         /*
1210          * c0_config.od (bit 19) was write only (and read as 0)
1211          * on the early revisions of Alchemy SOCs.  It disables the bus
1212          * transaction overlapping and needs to be set to fix various errata.
1213          */
1214         switch (read_c0_prid()) {
1215         case 0x00030100: /* Au1000 DA */
1216         case 0x00030201: /* Au1000 HA */
1217         case 0x00030202: /* Au1000 HB */
1218         case 0x01030200: /* Au1500 AB */
1219         /*
1220          * Au1100 errata actually keeps silence about this bit, so we set it
1221          * just in case for those revisions that require it to be set according
1222          * to arch/mips/au1000/common/cputable.c
1223          */
1224         case 0x02030200: /* Au1100 AB */
1225         case 0x02030201: /* Au1100 BA */
1226         case 0x02030202: /* Au1100 BC */
1227                 set_c0_config(1 << 19);
1228                 break;
1229         }
1230 }
1231
1232 /* CP0 hazard avoidance. */
1233 #define NXP_BARRIER()                                                   \
1234          __asm__ __volatile__(                                          \
1235         ".set noreorder\n\t"                                            \
1236         "nop; nop; nop; nop; nop; nop;\n\t"                             \
1237         ".set reorder\n\t")
1238
1239 static void nxp_pr4450_fixup_config(void)
1240 {
1241         unsigned long config0;
1242
1243         config0 = read_c0_config();
1244
1245         /* clear all three cache coherency fields */
1246         config0 &= ~(0x7 | (7 << 25) | (7 << 28));
1247         config0 |= (((_page_cachable_default >> _CACHE_SHIFT) <<  0) |
1248                     ((_page_cachable_default >> _CACHE_SHIFT) << 25) |
1249                     ((_page_cachable_default >> _CACHE_SHIFT) << 28));
1250         write_c0_config(config0);
1251         NXP_BARRIER();
1252 }
1253
1254 static int __cpuinitdata cca = -1;
1255
1256 static int __init cca_setup(char *str)
1257 {
1258         get_option(&str, &cca);
1259
1260         return 1;
1261 }
1262
1263 __setup("cca=", cca_setup);
1264
1265 static void __cpuinit coherency_setup(void)
1266 {
1267         if (cca < 0 || cca > 7)
1268                 cca = read_c0_config() & CONF_CM_CMASK;
1269         _page_cachable_default = cca << _CACHE_SHIFT;
1270
1271         pr_debug("Using cache attribute %d\n", cca);
1272         change_c0_config(CONF_CM_CMASK, cca);
1273
1274         /*
1275          * c0_status.cu=0 specifies that updates by the sc instruction use
1276          * the coherency mode specified by the TLB; 1 means cachable
1277          * coherent update on write will be used.  Not all processors have
1278          * this bit and; some wire it to zero, others like Toshiba had the
1279          * silly idea of putting something else there ...
1280          */
1281         switch (current_cpu_type()) {
1282         case CPU_R4000PC:
1283         case CPU_R4000SC:
1284         case CPU_R4000MC:
1285         case CPU_R4400PC:
1286         case CPU_R4400SC:
1287         case CPU_R4400MC:
1288                 clear_c0_config(CONF_CU);
1289                 break;
1290         /*
1291          * We need to catch the early Alchemy SOCs with
1292          * the write-only co_config.od bit and set it back to one...
1293          */
1294         case CPU_AU1000: /* rev. DA, HA, HB */
1295         case CPU_AU1100: /* rev. AB, BA, BC ?? */
1296         case CPU_AU1500: /* rev. AB */
1297                 au1x00_fixup_config_od();
1298                 break;
1299
1300         case PRID_IMP_PR4450:
1301                 nxp_pr4450_fixup_config();
1302                 break;
1303         }
1304 }
1305
1306 #if defined(CONFIG_DMA_NONCOHERENT)
1307
1308 static int __cpuinitdata coherentio;
1309
1310 static int __init setcoherentio(char *str)
1311 {
1312         coherentio = 1;
1313
1314         return 1;
1315 }
1316
1317 __setup("coherentio", setcoherentio);
1318 #endif
1319
1320 void __cpuinit r4k_cache_init(void)
1321 {
1322         extern void build_clear_page(void);
1323         extern void build_copy_page(void);
1324         extern char __weak except_vec2_generic;
1325         extern char __weak except_vec2_sb1;
1326         struct cpuinfo_mips *c = &current_cpu_data;
1327
1328         switch (c->cputype) {
1329         case CPU_SB1:
1330         case CPU_SB1A:
1331                 set_uncached_handler(0x100, &except_vec2_sb1, 0x80);
1332                 break;
1333
1334         default:
1335                 set_uncached_handler(0x100, &except_vec2_generic, 0x80);
1336                 break;
1337         }
1338
1339         probe_pcache();
1340         setup_scache();
1341
1342         r4k_blast_dcache_page_setup();
1343         r4k_blast_dcache_page_indexed_setup();
1344         r4k_blast_dcache_setup();
1345         r4k_blast_icache_page_setup();
1346         r4k_blast_icache_page_indexed_setup();
1347         r4k_blast_icache_setup();
1348         r4k_blast_scache_page_setup();
1349         r4k_blast_scache_page_indexed_setup();
1350         r4k_blast_scache_setup();
1351
1352         /*
1353          * Some MIPS32 and MIPS64 processors have physically indexed caches.
1354          * This code supports virtually indexed processors and will be
1355          * unnecessarily inefficient on physically indexed processors.
1356          */
1357         if (c->dcache.linesz)
1358                 shm_align_mask = max_t( unsigned long,
1359                                         c->dcache.sets * c->dcache.linesz - 1,
1360                                         PAGE_SIZE - 1);
1361         else
1362                 shm_align_mask = PAGE_SIZE-1;
1363
1364         __flush_cache_vmap      = r4k__flush_cache_vmap;
1365         __flush_cache_vunmap    = r4k__flush_cache_vunmap;
1366
1367         flush_cache_all         = cache_noop;
1368         __flush_cache_all       = r4k___flush_cache_all;
1369         flush_cache_mm          = r4k_flush_cache_mm;
1370         flush_cache_page        = r4k_flush_cache_page;
1371         flush_cache_range       = r4k_flush_cache_range;
1372
1373         flush_cache_sigtramp    = r4k_flush_cache_sigtramp;
1374         flush_icache_all        = r4k_flush_icache_all;
1375         local_flush_data_cache_page     = local_r4k_flush_data_cache_page;
1376         flush_data_cache_page   = r4k_flush_data_cache_page;
1377         flush_icache_range      = r4k_flush_icache_range;
1378
1379 #if defined(CONFIG_DMA_NONCOHERENT)
1380         if (coherentio) {
1381                 _dma_cache_wback_inv    = (void *)cache_noop;
1382                 _dma_cache_wback        = (void *)cache_noop;
1383                 _dma_cache_inv          = (void *)cache_noop;
1384         } else {
1385                 _dma_cache_wback_inv    = r4k_dma_cache_wback_inv;
1386                 _dma_cache_wback        = r4k_dma_cache_wback_inv;
1387                 _dma_cache_inv          = r4k_dma_cache_inv;
1388         }
1389 #endif
1390
1391         build_clear_page();
1392         build_copy_page();
1393 #if !defined(CONFIG_MIPS_CMP)
1394         local_r4k___flush_cache_all(NULL);
1395 #endif
1396         coherency_setup();
1397 }