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/smp.h>
  17 #include <linux/mm.h>
  18 #include <linux/module.h>
  19 #include <linux/bitops.h>
  20
  21 #include <asm/bcache.h>
  22 #include <asm/bootinfo.h>
  23 #include <asm/cache.h>
  24 #include <asm/cacheops.h>
  25 #include <asm/cpu.h>
  26 #include <asm/cpu-features.h>
  27 #include <asm/io.h>
  28 #include <asm/page.h>
  29 #include <asm/pgtable.h>
  30 #include <asm/r4kcache.h>
  31 #include <asm/sections.h>
  32 #include <asm/system.h>
  33 #include <asm/mmu_context.h>
  34 #include <asm/war.h>
  35 #include <asm/cacheflush.h> /* for run_uncached() */
  36
  37
  38 /*
  39  * Special Variant of smp_call_function for use by cache functions:
  40  *
  41  *  o No return value
  42  *  o collapses to normal function call on UP kernels
  43  *  o collapses to normal function call on systems with a single shared
  44  *    primary cache.
  45  *  o doesn't disable interrupts on the local CPU
  46  */
  47 static inline void r4k_on_each_cpu(void (*func) (void *info), void *info)
  48 {
  49         preempt_disable();
  50
  51 #if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC)
  52         smp_call_function(func, info, 1);
  53 #endif
  54         func(info);
  55         preempt_enable();
  56 }
  57
  58 #if defined(CONFIG_MIPS_CMP)
  59 #define cpu_has_safe_index_cacheops 0
  60 #else
  61 #define cpu_has_safe_index_cacheops 1
  62 #endif
  63
  64 /*
  65  * Must die.
  66  */
  67 static unsigned long icache_size __read_mostly;
  68 static unsigned long dcache_size __read_mostly;
  69 static unsigned long scache_size __read_mostly;
  70
  71 /*
  72  * Dummy cache handling routines for machines without boardcaches
  73  */
  74 static void cache_noop(void) {}
  75
  76 static struct bcache_ops no_sc_ops = {
  77         .bc_enable = (void *)cache_noop,
  78         .bc_disable = (void *)cache_noop,
  79         .bc_wback_inv = (void *)cache_noop,
  80         .bc_inv = (void *)cache_noop
  81 };
  82
  83 struct bcache_ops *bcops = &no_sc_ops;
  84
  85 #define cpu_is_r4600_v1_x()     ((read_c0_prid() & 0xfffffff0) == 0x00002010)
  86 #define cpu_is_r4600_v2_x()     ((read_c0_prid() & 0xfffffff0) == 0x00002020)
  87
  88 #define R4600_HIT_CACHEOP_WAR_IMPL                                      \
  89 do {                                                                    \
  90         if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x())            \
  91                 *(volatile unsigned long *)CKSEG1;                      \
  92         if (R4600_V1_HIT_CACHEOP_WAR)                                   \
  93                 __asm__ __volatile__("nop;nop;nop;nop");                \
  94 } while (0)
  95
  96 static void (*r4k_blast_dcache_page)(unsigned long addr);
  97
  98 static inline void r4k_blast_dcache_page_dc32(unsigned long addr)
  99 {
 100         R4600_HIT_CACHEOP_WAR_IMPL;
 101         blast_dcache32_page(addr);
 102 }
 103
 104 static inline void r4k_blast_dcache_page_dc64(unsigned long addr)
 105 {
 106         R4600_HIT_CACHEOP_WAR_IMPL;
 107         blast_dcache64_page(addr);
 108 }
 109
 110 static void __cpuinit r4k_blast_dcache_page_setup(void)
 111 {
 112         unsigned long  dc_lsize = cpu_dcache_line_size();
 113
 114         if (dc_lsize == 0)
 115                 r4k_blast_dcache_page = (void *)cache_noop;
 116         else if (dc_lsize == 16)
 117                 r4k_blast_dcache_page = blast_dcache16_page;
 118         else if (dc_lsize == 32)
 119                 r4k_blast_dcache_page = r4k_blast_dcache_page_dc32;
 120         else if (dc_lsize == 64)
 121                 r4k_blast_dcache_page = r4k_blast_dcache_page_dc64;
 122 }
 123
 124 static void (* r4k_blast_dcache_page_indexed)(unsigned long addr);
 125
 126 static void __cpuinit r4k_blast_dcache_page_indexed_setup(void)
 127 {
 128         unsigned long dc_lsize = cpu_dcache_line_size();
 129
 130         if (dc_lsize == 0)
 131                 r4k_blast_dcache_page_indexed = (void *)cache_noop;
 132         else if (dc_lsize == 16)
 133                 r4k_blast_dcache_page_indexed = blast_dcache16_page_indexed;
 134         else if (dc_lsize == 32)
 135                 r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed;
 136         else if (dc_lsize == 64)
 137                 r4k_blast_dcache_page_indexed = blast_dcache64_page_indexed;
 138 }
 139
 140 static void (* r4k_blast_dcache)(void);
 141
 142 static void __cpuinit r4k_blast_dcache_setup(void)
 143 {
 144         unsigned long dc_lsize = cpu_dcache_line_size();
 145
 146         if (dc_lsize == 0)
 147                 r4k_blast_dcache = (void *)cache_noop;
 148         else if (dc_lsize == 16)
 149                 r4k_blast_dcache = blast_dcache16;
 150         else if (dc_lsize == 32)
 151                 r4k_blast_dcache = blast_dcache32;
 152         else if (dc_lsize == 64)
 153                 r4k_blast_dcache = blast_dcache64;
 154 }
 155
 156 /* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
 157 #define JUMP_TO_ALIGN(order) \
 158         __asm__ __volatile__( \
 159                 "b\t1f\n\t" \
 160                 ".align\t" #order "\n\t" \
 161                 "1:\n\t" \
 162                 )
 163 #define CACHE32_UNROLL32_ALIGN  JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
 164 #define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
 165
 166 static inline void blast_r4600_v1_icache32(void)
 167 {
 168         unsigned long flags;
 169
 170         local_irq_save(flags);
 171         blast_icache32();
 172         local_irq_restore(flags);
 173 }
 174
 175 static inline void tx49_blast_icache32(void)
 176 {
 177         unsigned long start = INDEX_BASE;
 178         unsigned long end = start + current_cpu_data.icache.waysize;
 179         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 180         unsigned long ws_end = current_cpu_data.icache.ways <<
 181                                current_cpu_data.icache.waybit;
 182         unsigned long ws, addr;
 183
 184         CACHE32_UNROLL32_ALIGN2;
 185         /* I'm in even chunk.  blast odd chunks */
 186         for (ws = 0; ws < ws_end; ws += ws_inc)
 187                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 188                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 189         CACHE32_UNROLL32_ALIGN;
 190         /* I'm in odd chunk.  blast even chunks */
 191         for (ws = 0; ws < ws_end; ws += ws_inc)
 192                 for (addr = start; addr < end; addr += 0x400 * 2)
 193                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 194 }
 195
 196 static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page)
 197 {
 198         unsigned long flags;
 199
 200         local_irq_save(flags);
 201         blast_icache32_page_indexed(page);
 202         local_irq_restore(flags);
 203 }
 204
 205 static inline void tx49_blast_icache32_page_indexed(unsigned long page)
 206 {
 207         unsigned long indexmask = current_cpu_data.icache.waysize - 1;
 208         unsigned long start = INDEX_BASE + (page & indexmask);
 209         unsigned long end = start + PAGE_SIZE;
 210         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 211         unsigned long ws_end = current_cpu_data.icache.ways <<
 212                                current_cpu_data.icache.waybit;
 213         unsigned long ws, addr;
 214
 215         CACHE32_UNROLL32_ALIGN2;
 216         /* I'm in even chunk.  blast odd chunks */
 217         for (ws = 0; ws < ws_end; ws += ws_inc)
 218                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 219                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 220         CACHE32_UNROLL32_ALIGN;
 221         /* I'm in odd chunk.  blast even chunks */
 222         for (ws = 0; ws < ws_end; ws += ws_inc)
 223                 for (addr = start; addr < end; addr += 0x400 * 2)
 224                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 225 }
 226
 227 static void (* r4k_blast_icache_page)(unsigned long addr);
 228
 229 static void __cpuinit r4k_blast_icache_page_setup(void)
 230 {
 231         unsigned long ic_lsize = cpu_icache_line_size();
 232
 233         if (ic_lsize == 0)
 234                 r4k_blast_icache_page = (void *)cache_noop;
 235         else if (ic_lsize == 16)
 236                 r4k_blast_icache_page = blast_icache16_page;
 237         else if (ic_lsize == 32)
 238                 r4k_blast_icache_page = blast_icache32_page;
 239         else if (ic_lsize == 64)
 240                 r4k_blast_icache_page = blast_icache64_page;
 241 }
 242
 243
 244 static void (* r4k_blast_icache_page_indexed)(unsigned long addr);
 245
 246 static void __cpuinit r4k_blast_icache_page_indexed_setup(void)
 247 {
 248         unsigned long ic_lsize = cpu_icache_line_size();
 249
 250         if (ic_lsize == 0)
 251                 r4k_blast_icache_page_indexed = (void *)cache_noop;
 252         else if (ic_lsize == 16)
 253                 r4k_blast_icache_page_indexed = blast_icache16_page_indexed;
 254         else if (ic_lsize == 32) {
 255                 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
 256                         r4k_blast_icache_page_indexed =
 257                                 blast_icache32_r4600_v1_page_indexed;
 258                 else if (TX49XX_ICACHE_INDEX_INV_WAR)
 259                         r4k_blast_icache_page_indexed =
 260                                 tx49_blast_icache32_page_indexed;
 261                 else
 262                         r4k_blast_icache_page_indexed =
 263                                 blast_icache32_page_indexed;
 264         } else if (ic_lsize == 64)
 265                 r4k_blast_icache_page_indexed = blast_icache64_page_indexed;
 266 }
 267
 268 static void (* r4k_blast_icache)(void);
 269
 270 static void __cpuinit r4k_blast_icache_setup(void)
 271 {
 272         unsigned long ic_lsize = cpu_icache_line_size();
 273
 274         if (ic_lsize == 0)
 275                 r4k_blast_icache = (void *)cache_noop;
 276         else if (ic_lsize == 16)
 277                 r4k_blast_icache = blast_icache16;
 278         else if (ic_lsize == 32) {
 279                 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
 280                         r4k_blast_icache = blast_r4600_v1_icache32;
 281                 else if (TX49XX_ICACHE_INDEX_INV_WAR)
 282                         r4k_blast_icache = tx49_blast_icache32;
 283                 else
 284                         r4k_blast_icache = blast_icache32;
 285         } else if (ic_lsize == 64)
 286                 r4k_blast_icache = blast_icache64;
 287 }
 288
 289 static void (* r4k_blast_scache_page)(unsigned long addr);
 290
 291 static void __cpuinit r4k_blast_scache_page_setup(void)
 292 {
 293         unsigned long sc_lsize = cpu_scache_line_size();
 294
 295         if (scache_size == 0)
 296                 r4k_blast_scache_page = (void *)cache_noop;
 297         else if (sc_lsize == 16)
 298                 r4k_blast_scache_page = blast_scache16_page;
 299         else if (sc_lsize == 32)
 300                 r4k_blast_scache_page = blast_scache32_page;
 301         else if (sc_lsize == 64)
 302                 r4k_blast_scache_page = blast_scache64_page;
 303         else if (sc_lsize == 128)
 304                 r4k_blast_scache_page = blast_scache128_page;
 305 }
 306
 307 static void (* r4k_blast_scache_page_indexed)(unsigned long addr);
 308
 309 static void __cpuinit r4k_blast_scache_page_indexed_setup(void)
 310 {
 311         unsigned long sc_lsize = cpu_scache_line_size();
 312
 313         if (scache_size == 0)
 314                 r4k_blast_scache_page_indexed = (void *)cache_noop;
 315         else if (sc_lsize == 16)
 316                 r4k_blast_scache_page_indexed = blast_scache16_page_indexed;
 317         else if (sc_lsize == 32)
 318                 r4k_blast_scache_page_indexed = blast_scache32_page_indexed;
 319         else if (sc_lsize == 64)
 320                 r4k_blast_scache_page_indexed = blast_scache64_page_indexed;
 321         else if (sc_lsize == 128)
 322                 r4k_blast_scache_page_indexed = blast_scache128_page_indexed;
 323 }
 324
 325 static void (* r4k_blast_scache)(void);
 326
 327 static void __cpuinit r4k_blast_scache_setup(void)
 328 {
 329         unsigned long sc_lsize = cpu_scache_line_size();
 330
 331         if (scache_size == 0)
 332                 r4k_blast_scache = (void *)cache_noop;
 333         else if (sc_lsize == 16)
 334                 r4k_blast_scache = blast_scache16;
 335         else if (sc_lsize == 32)
 336                 r4k_blast_scache = blast_scache32;
 337         else if (sc_lsize == 64)
 338                 r4k_blast_scache = blast_scache64;
 339         else if (sc_lsize == 128)
 340                 r4k_blast_scache = blast_scache128;
 341 }
 342
 343 static inline void local_r4k___flush_cache_all(void * args)
 344 {
 345 #if defined(CONFIG_CPU_LOONGSON2)
 346         r4k_blast_scache();
 347         return;
 348 #endif
 349         r4k_blast_dcache();
 350         r4k_blast_icache();
 351
 352         switch (current_cpu_type()) {
 353         case CPU_R4000SC:
 354         case CPU_R4000MC:
 355         case CPU_R4400SC:
 356         case CPU_R4400MC:
 357         case CPU_R10000:
 358         case CPU_R12000:
 359         case CPU_R14000:
 360                 r4k_blast_scache();
 361         }
 362 }
 363
 364 static void r4k___flush_cache_all(void)
 365 {
 366         r4k_on_each_cpu(local_r4k___flush_cache_all, NULL);
 367 }
 368
 369 static inline int has_valid_asid(const struct mm_struct *mm)
 370 {
 371 #if defined(CONFIG_MIPS_MT_SMP) || defined(CONFIG_MIPS_MT_SMTC)
 372         int i;
 373
 374         for_each_online_cpu(i)
 375                 if (cpu_context(i, mm))
 376                         return 1;
 377
 378         return 0;
 379 #else
 380         return cpu_context(smp_processor_id(), mm);
 381 #endif
 382 }
 383
 384 static void r4k__flush_cache_vmap(void)
 385 {
 386         r4k_blast_dcache();
 387 }
 388
 389 static void r4k__flush_cache_vunmap(void)
 390 {
 391         r4k_blast_dcache();
 392 }
 393
 394 static inline void local_r4k_flush_cache_range(void * args)
 395 {
 396         struct vm_area_struct *vma = args;
 397         int exec = vma->vm_flags & VM_EXEC;
 398
 399         if (!(has_valid_asid(vma->vm_mm)))
 400                 return;
 401
 402         r4k_blast_dcache();
 403         if (exec)
 404                 r4k_blast_icache();
 405 }
 406
 407 static void r4k_flush_cache_range(struct vm_area_struct *vma,
 408         unsigned long start, unsigned long end)
 409 {
 410         int exec = vma->vm_flags & VM_EXEC;
 411
 412         if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc))
 413                 r4k_on_each_cpu(local_r4k_flush_cache_range, vma);
 414 }
 415
 416 static inline void local_r4k_flush_cache_mm(void * args)
 417 {
 418         struct mm_struct *mm = args;
 419
 420         if (!has_valid_asid(mm))
 421                 return;
 422
 423         /*
 424          * Kludge alert.  For obscure reasons R4000SC and R4400SC go nuts if we
 425          * only flush the primary caches but R10000 and R12000 behave sane ...
 426          * R4000SC and R4400SC indexed S-cache ops also invalidate primary
 427          * caches, so we can bail out early.
 428          */
 429         if (current_cpu_type() == CPU_R4000SC ||
 430             current_cpu_type() == CPU_R4000MC ||
 431             current_cpu_type() == CPU_R4400SC ||
 432             current_cpu_type() == CPU_R4400MC) {
 433                 r4k_blast_scache();
 434                 return;
 435         }
 436
 437         r4k_blast_dcache();
 438 }
 439
 440 static void r4k_flush_cache_mm(struct mm_struct *mm)
 441 {
 442         if (!cpu_has_dc_aliases)
 443                 return;
 444
 445         r4k_on_each_cpu(local_r4k_flush_cache_mm, mm);
 446 }
 447
 448 struct flush_cache_page_args {
 449         struct vm_area_struct *vma;
 450         unsigned long addr;
 451         unsigned long pfn;
 452 };
 453
 454 static inline void local_r4k_flush_cache_page(void *args)
 455 {
 456         struct flush_cache_page_args *fcp_args = args;
 457         struct vm_area_struct *vma = fcp_args->vma;
 458         unsigned long addr = fcp_args->addr;
 459         struct page *page = pfn_to_page(fcp_args->pfn);
 460         int exec = vma->vm_flags & VM_EXEC;
 461         struct mm_struct *mm = vma->vm_mm;
 462         int map_coherent = 0;
 463         pgd_t *pgdp;
 464         pud_t *pudp;
 465         pmd_t *pmdp;
 466         pte_t *ptep;
 467         void *vaddr;
 468
 469         /*
 470          * If ownes no valid ASID yet, cannot possibly have gotten
 471          * this page into the cache.
 472          */
 473         if (!has_valid_asid(mm))
 474                 return;
 475
 476         addr &= PAGE_MASK;
 477         pgdp = pgd_offset(mm, addr);
 478         pudp = pud_offset(pgdp, addr);
 479         pmdp = pmd_offset(pudp, addr);
 480         ptep = pte_offset(pmdp, addr);
 481
 482         /*
 483          * If the page isn't marked valid, the page cannot possibly be
 484          * in the cache.
 485          */
 486         if (!(pte_present(*ptep)))
 487                 return;
 488
 489         if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID))
 490                 vaddr = NULL;
 491         else {
 492                 /*
 493                  * Use kmap_coherent or kmap_atomic to do flushes for
 494                  * another ASID than the current one.
 495                  */
 496                 map_coherent = (cpu_has_dc_aliases &&
 497                                 page_mapped(page) && !Page_dcache_dirty(page));
 498                 if (map_coherent)
 499                         vaddr = kmap_coherent(page, addr);
 500                 else
 501                         vaddr = kmap_atomic(page, KM_USER0);
 502                 addr = (unsigned long)vaddr;
 503         }
 504
 505         if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
 506                 r4k_blast_dcache_page(addr);
 507                 if (exec && !cpu_icache_snoops_remote_store)
 508                         r4k_blast_scache_page(addr);
 509         }
 510         if (exec) {
 511                 if (vaddr && cpu_has_vtag_icache && mm == current->active_mm) {
 512                         int cpu = smp_processor_id();
 513
 514                         if (cpu_context(cpu, mm) != 0)
 515                                 drop_mmu_context(mm, cpu);
 516                 } else
 517                         r4k_blast_icache_page(addr);
 518         }
 519
 520         if (vaddr) {
 521                 if (map_coherent)
 522                         kunmap_coherent();
 523                 else
 524                         kunmap_atomic(vaddr, KM_USER0);
 525         }
 526 }
 527
 528 static void r4k_flush_cache_page(struct vm_area_struct *vma,
 529         unsigned long addr, unsigned long pfn)
 530 {
 531         struct flush_cache_page_args args;
 532
 533         args.vma = vma;
 534         args.addr = addr;
 535         args.pfn = pfn;
 536
 537         r4k_on_each_cpu(local_r4k_flush_cache_page, &args);
 538 }
 539
 540 static inline void local_r4k_flush_data_cache_page(void * addr)
 541 {
 542         r4k_blast_dcache_page((unsigned long) addr);
 543 }
 544
 545 static void r4k_flush_data_cache_page(unsigned long addr)
 546 {
 547         if (in_atomic())
 548                 local_r4k_flush_data_cache_page((void *)addr);
 549         else
 550                 r4k_on_each_cpu(local_r4k_flush_data_cache_page, (void *) addr);
 551 }
 552
 553 struct flush_icache_range_args {
 554         unsigned long start;
 555         unsigned long end;
 556 };
 557
 558 static inline void local_r4k_flush_icache_range(unsigned long start, unsigned long end)
 559 {
 560         if (!cpu_has_ic_fills_f_dc) {
 561                 if (end - start >= dcache_size) {
 562                         r4k_blast_dcache();
 563                 } else {
 564                         R4600_HIT_CACHEOP_WAR_IMPL;
 565                         protected_blast_dcache_range(start, end);
 566                 }
 567         }
 568
 569         if (end - start > icache_size)
 570                 r4k_blast_icache();
 571         else
 572                 protected_blast_icache_range(start, end);
 573 }
 574
 575 static inline void local_r4k_flush_icache_range_ipi(void *args)
 576 {
 577         struct flush_icache_range_args *fir_args = args;
 578         unsigned long start = fir_args->start;
 579         unsigned long end = fir_args->end;
 580
 581         local_r4k_flush_icache_range(start, end);
 582 }
 583
 584 static void r4k_flush_icache_range(unsigned long start, unsigned long end)
 585 {
 586         struct flush_icache_range_args args;
 587
 588         args.start = start;
 589         args.end = end;
 590
 591         r4k_on_each_cpu(local_r4k_flush_icache_range_ipi, &args);
 592         instruction_hazard();
 593 }
 594
 595 #ifdef CONFIG_DMA_NONCOHERENT
 596
 597 static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
 598 {
 599         /* Catch bad driver code */
 600         BUG_ON(size == 0);
 601
 602         if (cpu_has_inclusive_pcaches) {
 603                 if (size >= scache_size)
 604                         r4k_blast_scache();
 605                 else
 606                         blast_scache_range(addr, addr + size);
 607                 return;
 608         }
 609
 610         /*
 611          * Either no secondary cache or the available caches don't have the
 612          * subset property so we have to flush the primary caches
 613          * explicitly
 614          */
 615         if (cpu_has_safe_index_cacheops && size >= dcache_size) {
 616                 r4k_blast_dcache();
 617         } else {
 618                 R4600_HIT_CACHEOP_WAR_IMPL;
 619                 blast_dcache_range(addr, addr + size);
 620         }
 621
 622         bc_wback_inv(addr, size);
 623 }
 624
 625 static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
 626 {
 627         /* Catch bad driver code */
 628         BUG_ON(size == 0);
 629
 630         if (cpu_has_inclusive_pcaches) {
 631                 if (size >= scache_size)
 632                         r4k_blast_scache();
 633                 else {
 634                         unsigned long lsize = cpu_scache_line_size();
 635                         unsigned long almask = ~(lsize - 1);
 636
 637                         /*
 638                          * There is no clearly documented alignment requirement
 639                          * for the cache instruction on MIPS processors and
 640                          * some processors, among them the RM5200 and RM7000
 641                          * QED processors will throw an address error for cache
 642                          * hit ops with insufficient alignment.  Solved by
 643                          * aligning the address to cache line size.
 644                          */
 645                         cache_op(Hit_Writeback_Inv_SD, addr & almask);
 646                         cache_op(Hit_Writeback_Inv_SD,
 647                                  (addr + size - 1) & almask);
 648                         blast_inv_scache_range(addr, addr + size);
 649                 }
 650                 return;
 651         }
 652
 653         if (cpu_has_safe_index_cacheops && size >= dcache_size) {
 654                 r4k_blast_dcache();
 655         } else {
 656                 unsigned long lsize = cpu_dcache_line_size();
 657                 unsigned long almask = ~(lsize - 1);
 658
 659                 R4600_HIT_CACHEOP_WAR_IMPL;
 660                 cache_op(Hit_Writeback_Inv_D, addr & almask);
 661                 cache_op(Hit_Writeback_Inv_D, (addr + size - 1)  & almask);
 662                 blast_inv_dcache_range(addr, addr + size);
 663         }
 664
 665         bc_inv(addr, size);
 666 }
 667 #endif /* CONFIG_DMA_NONCOHERENT */
 668
 669 /*
 670  * While we're protected against bad userland addresses we don't care
 671  * very much about what happens in that case.  Usually a segmentation
 672  * fault will dump the process later on anyway ...
 673  */
 674 static void local_r4k_flush_cache_sigtramp(void * arg)
 675 {
 676         unsigned long ic_lsize = cpu_icache_line_size();
 677         unsigned long dc_lsize = cpu_dcache_line_size();
 678         unsigned long sc_lsize = cpu_scache_line_size();
 679         unsigned long addr = (unsigned long) arg;
 680
 681         R4600_HIT_CACHEOP_WAR_IMPL;
 682         if (dc_lsize)
 683                 protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
 684         if (!cpu_icache_snoops_remote_store && scache_size)
 685                 protected_writeback_scache_line(addr & ~(sc_lsize - 1));
 686         if (ic_lsize)
 687                 protected_flush_icache_line(addr & ~(ic_lsize - 1));
 688         if (MIPS4K_ICACHE_REFILL_WAR) {
 689                 __asm__ __volatile__ (
 690                         ".set push\n\t"
 691                         ".set noat\n\t"
 692                         ".set mips3\n\t"
 693 #ifdef CONFIG_32BIT
 694                         "la     $at,1f\n\t"
 695 #endif
 696 #ifdef CONFIG_64BIT
 697                         "dla    $at,1f\n\t"
 698 #endif
 699                         "cache  %0,($at)\n\t"
 700                         "nop; nop; nop\n"
 701                         "1:\n\t"
 702                         ".set pop"
 703                         :
 704                         : "i" (Hit_Invalidate_I));
 705         }
 706         if (MIPS_CACHE_SYNC_WAR)
 707                 __asm__ __volatile__ ("sync");
 708 }
 709
 710 static void r4k_flush_cache_sigtramp(unsigned long addr)
 711 {
 712         r4k_on_each_cpu(local_r4k_flush_cache_sigtramp, (void *) addr);
 713 }
 714
 715 static void r4k_flush_icache_all(void)
 716 {
 717         if (cpu_has_vtag_icache)
 718                 r4k_blast_icache();
 719 }
 720
 721 static inline void rm7k_erratum31(void)
 722 {
 723         const unsigned long ic_lsize = 32;
 724         unsigned long addr;
 725
 726         /* RM7000 erratum #31. The icache is screwed at startup. */
 727         write_c0_taglo(0);
 728         write_c0_taghi(0);
 729
 730         for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) {
 731                 __asm__ __volatile__ (
 732                         ".set push\n\t"
 733                         ".set noreorder\n\t"
 734                         ".set mips3\n\t"
 735                         "cache\t%1, 0(%0)\n\t"
 736                         "cache\t%1, 0x1000(%0)\n\t"
 737                         "cache\t%1, 0x2000(%0)\n\t"
 738                         "cache\t%1, 0x3000(%0)\n\t"
 739                         "cache\t%2, 0(%0)\n\t"
 740                         "cache\t%2, 0x1000(%0)\n\t"
 741                         "cache\t%2, 0x2000(%0)\n\t"
 742                         "cache\t%2, 0x3000(%0)\n\t"
 743                         "cache\t%1, 0(%0)\n\t"
 744                         "cache\t%1, 0x1000(%0)\n\t"
 745                         "cache\t%1, 0x2000(%0)\n\t"
 746                         "cache\t%1, 0x3000(%0)\n\t"
 747                         ".set pop\n"
 748                         :
 749                         : "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill));
 750         }
 751 }
 752
 753 static char *way_string[] __cpuinitdata = { NULL, "direct mapped", "2-way",
 754         "3-way", "4-way", "5-way", "6-way", "7-way", "8-way"
 755 };
 756
 757 static void __cpuinit probe_pcache(void)
 758 {
 759         struct cpuinfo_mips *c = &current_cpu_data;
 760         unsigned int config = read_c0_config();
 761         unsigned int prid = read_c0_prid();
 762         unsigned long config1;
 763         unsigned int lsize;
 764
 765         switch (c->cputype) {
 766         case CPU_R4600:                 /* QED style two way caches? */
 767         case CPU_R4700:
 768         case CPU_R5000:
 769         case CPU_NEVADA:
 770                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 771                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 772                 c->icache.ways = 2;
 773                 c->icache.waybit = __ffs(icache_size/2);
 774
 775                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 776                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 777                 c->dcache.ways = 2;
 778                 c->dcache.waybit= __ffs(dcache_size/2);
 779
 780                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 781                 break;
 782
 783         case CPU_R5432:
 784         case CPU_R5500:
 785                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 786                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 787                 c->icache.ways = 2;
 788                 c->icache.waybit= 0;
 789
 790                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 791                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 792                 c->dcache.ways = 2;
 793                 c->dcache.waybit = 0;
 794
 795                 c->options |= MIPS_CPU_CACHE_CDEX_P | MIPS_CPU_PREFETCH;
 796                 break;
 797
 798         case CPU_TX49XX:
 799                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 800                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 801                 c->icache.ways = 4;
 802                 c->icache.waybit= 0;
 803
 804                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 805                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 806                 c->dcache.ways = 4;
 807                 c->dcache.waybit = 0;
 808
 809                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 810                 c->options |= MIPS_CPU_PREFETCH;
 811                 break;
 812
 813         case CPU_R4000PC:
 814         case CPU_R4000SC:
 815         case CPU_R4000MC:
 816         case CPU_R4400PC:
 817         case CPU_R4400SC:
 818         case CPU_R4400MC:
 819         case CPU_R4300:
 820                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 821                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 822                 c->icache.ways = 1;
 823                 c->icache.waybit = 0;   /* doesn't matter */
 824
 825                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 826                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 827                 c->dcache.ways = 1;
 828                 c->dcache.waybit = 0;   /* does not matter */
 829
 830                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 831                 break;
 832
 833         case CPU_R10000:
 834         case CPU_R12000:
 835         case CPU_R14000:
 836                 icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29));
 837                 c->icache.linesz = 64;
 838                 c->icache.ways = 2;
 839                 c->icache.waybit = 0;
 840
 841                 dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26));
 842                 c->dcache.linesz = 32;
 843                 c->dcache.ways = 2;
 844                 c->dcache.waybit = 0;
 845
 846                 c->options |= MIPS_CPU_PREFETCH;
 847                 break;
 848
 849         case CPU_VR4133:
 850                 write_c0_config(config & ~VR41_CONF_P4K);
 851         case CPU_VR4131:
 852                 /* Workaround for cache instruction bug of VR4131 */
 853                 if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U ||
 854                     c->processor_id == 0x0c82U) {
 855                         config |= 0x00400000U;
 856                         if (c->processor_id == 0x0c80U)
 857                                 config |= VR41_CONF_BP;
 858                         write_c0_config(config);
 859                 } else
 860                         c->options |= MIPS_CPU_CACHE_CDEX_P;
 861
 862                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
 863                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 864                 c->icache.ways = 2;
 865                 c->icache.waybit = __ffs(icache_size/2);
 866
 867                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
 868                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 869                 c->dcache.ways = 2;
 870                 c->dcache.waybit = __ffs(dcache_size/2);
 871                 break;
 872
 873         case CPU_VR41XX:
 874         case CPU_VR4111:
 875         case CPU_VR4121:
 876         case CPU_VR4122:
 877         case CPU_VR4181:
 878         case CPU_VR4181A:
 879                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
 880                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 881                 c->icache.ways = 1;
 882                 c->icache.waybit = 0;   /* doesn't matter */
 883
 884                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
 885                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 886                 c->dcache.ways = 1;
 887                 c->dcache.waybit = 0;   /* does not matter */
 888
 889                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 890                 break;
 891
 892         case CPU_RM7000:
 893                 rm7k_erratum31();
 894
 895         case CPU_RM9000:
 896                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 897                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 898                 c->icache.ways = 4;
 899                 c->icache.waybit = __ffs(icache_size / c->icache.ways);
 900
 901                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 902                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 903                 c->dcache.ways = 4;
 904                 c->dcache.waybit = __ffs(dcache_size / c->dcache.ways);
 905
 906 #if !defined(CONFIG_SMP) || !defined(RM9000_CDEX_SMP_WAR)
 907                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 908 #endif
 909                 c->options |= MIPS_CPU_PREFETCH;
 910                 break;
 911
 912         case CPU_LOONGSON2:
 913                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 914                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 915                 if (prid & 0x3)
 916                         c->icache.ways = 4;
 917                 else
 918                         c->icache.ways = 2;
 919                 c->icache.waybit = 0;
 920
 921                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 922                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 923                 if (prid & 0x3)
 924                         c->dcache.ways = 4;
 925                 else
 926                         c->dcache.ways = 2;
 927                 c->dcache.waybit = 0;
 928                 break;
 929
 930         default:
 931                 if (!(config & MIPS_CONF_M))
 932                         panic("Don't know how to probe P-caches on this cpu.");
 933
 934                 /*
 935                  * So we seem to be a MIPS32 or MIPS64 CPU
 936                  * So let's probe the I-cache ...
 937                  */
 938                 config1 = read_c0_config1();
 939
 940                 if ((lsize = ((config1 >> 19) & 7)))
 941                         c->icache.linesz = 2 << lsize;
 942                 else
 943                         c->icache.linesz = lsize;
 944                 c->icache.sets = 64 << ((config1 >> 22) & 7);
 945                 c->icache.ways = 1 + ((config1 >> 16) & 7);
 946
 947                 icache_size = c->icache.sets *
 948                               c->icache.ways *
 949                               c->icache.linesz;
 950                 c->icache.waybit = __ffs(icache_size/c->icache.ways);
 951
 952                 if (config & 0x8)               /* VI bit */
 953                         c->icache.flags |= MIPS_CACHE_VTAG;
 954
 955                 /*
 956                  * Now probe the MIPS32 / MIPS64 data cache.
 957                  */
 958                 c->dcache.flags = 0;
 959
 960                 if ((lsize = ((config1 >> 10) & 7)))
 961                         c->dcache.linesz = 2 << lsize;
 962                 else
 963                         c->dcache.linesz= lsize;
 964                 c->dcache.sets = 64 << ((config1 >> 13) & 7);
 965                 c->dcache.ways = 1 + ((config1 >> 7) & 7);
 966
 967                 dcache_size = c->dcache.sets *
 968                               c->dcache.ways *
 969                               c->dcache.linesz;
 970                 c->dcache.waybit = __ffs(dcache_size/c->dcache.ways);
 971
 972                 c->options |= MIPS_CPU_PREFETCH;
 973                 break;
 974         }
 975
 976         /*
 977          * Processor configuration sanity check for the R4000SC erratum
 978          * #5.  With page sizes larger than 32kB there is no possibility
 979          * to get a VCE exception anymore so we don't care about this
 980          * misconfiguration.  The case is rather theoretical anyway;
 981          * presumably no vendor is shipping his hardware in the "bad"
 982          * configuration.
 983          */
 984         if ((prid & 0xff00) == PRID_IMP_R4000 && (prid & 0xff) < 0x40 &&
 985             !(config & CONF_SC) && c->icache.linesz != 16 &&
 986             PAGE_SIZE <= 0x8000)
 987                 panic("Improper R4000SC processor configuration detected");
 988
 989         /* compute a couple of other cache variables */
 990         c->icache.waysize = icache_size / c->icache.ways;
 991         c->dcache.waysize = dcache_size / c->dcache.ways;
 992
 993         c->icache.sets = c->icache.linesz ?
 994                 icache_size / (c->icache.linesz * c->icache.ways) : 0;
 995         c->dcache.sets = c->dcache.linesz ?
 996                 dcache_size / (c->dcache.linesz * c->dcache.ways) : 0;
 997
 998         /*
 999          * R10000 and R12000 P-caches are odd in a positive way.  They're 32kB
1000          * 2-way virtually indexed so normally would suffer from aliases.  So
1001          * normally they'd suffer from aliases but magic in the hardware deals
1002          * with that for us so we don't need to take care ourselves.
1003          */
1004         switch (c->cputype) {
1005         case CPU_20KC:
1006         case CPU_25KF:
1007         case CPU_SB1:
1008         case CPU_SB1A:
1009                 c->dcache.flags |= MIPS_CACHE_PINDEX;
1010                 break;
1011
1012         case CPU_R10000:
1013         case CPU_R12000:
1014         case CPU_R14000:
1015                 break;
1016
1017         case CPU_24K:
1018         case CPU_34K:
1019         case CPU_74K:
1020         case CPU_1004K:
1021                 if ((read_c0_config7() & (1 << 16))) {
1022                         /* effectively physically indexed dcache,
1023                            thus no virtual aliases. */
1024                         c->dcache.flags |= MIPS_CACHE_PINDEX;
1025                         break;
1026                 }
1027         default:
1028                 if (c->dcache.waysize > PAGE_SIZE)
1029                         c->dcache.flags |= MIPS_CACHE_ALIASES;
1030         }
1031
1032         switch (c->cputype) {
1033         case CPU_20KC:
1034                 /*
1035                  * Some older 20Kc chips doesn't have the 'VI' bit in
1036                  * the config register.
1037                  */
1038                 c->icache.flags |= MIPS_CACHE_VTAG;
1039                 break;
1040
1041         case CPU_ALCHEMY:
1042                 c->icache.flags |= MIPS_CACHE_IC_F_DC;
1043                 break;
1044         }
1045
1046 #ifdef  CONFIG_CPU_LOONGSON2
1047         /*
1048          * LOONGSON2 has 4 way icache, but when using indexed cache op,
1049          * one op will act on all 4 ways
1050          */
1051         c->icache.ways = 1;
1052 #endif
1053
1054         printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
1055                icache_size >> 10,
1056                c->icache.flags & MIPS_CACHE_VTAG ? "VIVT" : "VIPT",
1057                way_string[c->icache.ways], c->icache.linesz);
1058
1059         printk("Primary data cache %ldkB, %s, %s, %s, linesize %d bytes\n",
1060                dcache_size >> 10, way_string[c->dcache.ways],
1061                (c->dcache.flags & MIPS_CACHE_PINDEX) ? "PIPT" : "VIPT",
1062                (c->dcache.flags & MIPS_CACHE_ALIASES) ?
1063                         "cache aliases" : "no aliases",
1064                c->dcache.linesz);
1065 }
1066
1067 /*
1068  * If you even _breathe_ on this function, look at the gcc output and make sure
1069  * it does not pop things on and off the stack for the cache sizing loop that
1070  * executes in KSEG1 space or else you will crash and burn badly.  You have
1071  * been warned.
1072  */
1073 static int __cpuinit probe_scache(void)
1074 {
1075         unsigned long flags, addr, begin, end, pow2;
1076         unsigned int config = read_c0_config();
1077         struct cpuinfo_mips *c = &current_cpu_data;
1078         int tmp;
1079
1080         if (config & CONF_SC)
1081                 return 0;
1082
1083         begin = (unsigned long) &_stext;
1084         begin &= ~((4 * 1024 * 1024) - 1);
1085         end = begin + (4 * 1024 * 1024);
1086
1087         /*
1088          * This is such a bitch, you'd think they would make it easy to do
1089          * this.  Away you daemons of stupidity!
1090          */
1091         local_irq_save(flags);
1092
1093         /* Fill each size-multiple cache line with a valid tag. */
1094         pow2 = (64 * 1024);
1095         for (addr = begin; addr < end; addr = (begin + pow2)) {
1096                 unsigned long *p = (unsigned long *) addr;
1097                 __asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
1098                 pow2 <<= 1;
1099         }
1100
1101         /* Load first line with zero (therefore invalid) tag. */
1102         write_c0_taglo(0);
1103         write_c0_taghi(0);
1104         __asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
1105         cache_op(Index_Store_Tag_I, begin);
1106         cache_op(Index_Store_Tag_D, begin);
1107         cache_op(Index_Store_Tag_SD, begin);
1108
1109         /* Now search for the wrap around point. */
1110         pow2 = (128 * 1024);
1111         tmp = 0;
1112         for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) {
1113                 cache_op(Index_Load_Tag_SD, addr);
1114                 __asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
1115                 if (!read_c0_taglo())
1116                         break;
1117                 pow2 <<= 1;
1118         }
1119         local_irq_restore(flags);
1120         addr -= begin;
1121
1122         scache_size = addr;
1123         c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22);
1124         c->scache.ways = 1;
1125         c->dcache.waybit = 0;           /* does not matter */
1126
1127         return 1;
1128 }
1129
1130 #if defined(CONFIG_CPU_LOONGSON2)
1131 static void __init loongson2_sc_init(void)
1132 {
1133         struct cpuinfo_mips *c = &current_cpu_data;
1134
1135         scache_size = 512*1024;
1136         c->scache.linesz = 32;
1137         c->scache.ways = 4;
1138         c->scache.waybit = 0;
1139         c->scache.waysize = scache_size / (c->scache.ways);
1140         c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1141         pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1142                scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1143
1144         c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1145 }
1146 #endif
1147
1148 extern int r5k_sc_init(void);
1149 extern int rm7k_sc_init(void);
1150 extern int mips_sc_init(void);
1151
1152 static void __cpuinit setup_scache(void)
1153 {
1154         struct cpuinfo_mips *c = &current_cpu_data;
1155         unsigned int config = read_c0_config();
1156         int sc_present = 0;
1157
1158         /*
1159          * Do the probing thing on R4000SC and R4400SC processors.  Other
1160          * processors don't have a S-cache that would be relevant to the
1161          * Linux memory management.
1162          */
1163         switch (c->cputype) {
1164         case CPU_R4000SC:
1165         case CPU_R4000MC:
1166         case CPU_R4400SC:
1167         case CPU_R4400MC:
1168                 sc_present = run_uncached(probe_scache);
1169                 if (sc_present)
1170                         c->options |= MIPS_CPU_CACHE_CDEX_S;
1171                 break;
1172
1173         case CPU_R10000:
1174         case CPU_R12000:
1175         case CPU_R14000:
1176                 scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16);
1177                 c->scache.linesz = 64 << ((config >> 13) & 1);
1178                 c->scache.ways = 2;
1179                 c->scache.waybit= 0;
1180                 sc_present = 1;
1181                 break;
1182
1183         case CPU_R5000:
1184         case CPU_NEVADA:
1185 #ifdef CONFIG_R5000_CPU_SCACHE
1186                 r5k_sc_init();
1187 #endif
1188                 return;
1189
1190         case CPU_RM7000:
1191         case CPU_RM9000:
1192 #ifdef CONFIG_RM7000_CPU_SCACHE
1193                 rm7k_sc_init();
1194 #endif
1195                 return;
1196
1197 #if defined(CONFIG_CPU_LOONGSON2)
1198         case CPU_LOONGSON2:
1199                 loongson2_sc_init();
1200                 return;
1201 #endif
1202
1203         default:
1204                 if (c->isa_level == MIPS_CPU_ISA_M32R1 ||
1205                     c->isa_level == MIPS_CPU_ISA_M32R2 ||
1206                     c->isa_level == MIPS_CPU_ISA_M64R1 ||
1207                     c->isa_level == MIPS_CPU_ISA_M64R2) {
1208 #ifdef CONFIG_MIPS_CPU_SCACHE
1209                         if (mips_sc_init ()) {
1210                                 scache_size = c->scache.ways * c->scache.sets * c->scache.linesz;
1211                                 printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n",
1212                                        scache_size >> 10,
1213                                        way_string[c->scache.ways], c->scache.linesz);
1214                         }
1215 #else
1216                         if (!(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
1217                                 panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
1218 #endif
1219                         return;
1220                 }
1221                 sc_present = 0;
1222         }
1223
1224         if (!sc_present)
1225                 return;
1226
1227         /* compute a couple of other cache variables */
1228         c->scache.waysize = scache_size / c->scache.ways;
1229
1230         c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1231
1232         printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1233                scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1234
1235         c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1236 }
1237
1238 void au1x00_fixup_config_od(void)
1239 {
1240         /*
1241          * c0_config.od (bit 19) was write only (and read as 0)
1242          * on the early revisions of Alchemy SOCs.  It disables the bus
1243          * transaction overlapping and needs to be set to fix various errata.
1244          */
1245         switch (read_c0_prid()) {
1246         case 0x00030100: /* Au1000 DA */
1247         case 0x00030201: /* Au1000 HA */
1248         case 0x00030202: /* Au1000 HB */
1249         case 0x01030200: /* Au1500 AB */
1250         /*
1251          * Au1100 errata actually keeps silence about this bit, so we set it
1252          * just in case for those revisions that require it to be set according
1253          * to the (now gone) cpu table.
1254          */
1255         case 0x02030200: /* Au1100 AB */
1256         case 0x02030201: /* Au1100 BA */
1257         case 0x02030202: /* Au1100 BC */
1258                 set_c0_config(1 << 19);
1259                 break;
1260         }
1261 }
1262
1263 /* CP0 hazard avoidance. */
1264 #define NXP_BARRIER()                                                   \
1265          __asm__ __volatile__(                                          \
1266         ".set noreorder\n\t"                                            \
1267         "nop; nop; nop; nop; nop; nop;\n\t"                             \
1268         ".set reorder\n\t")
1269
1270 static void nxp_pr4450_fixup_config(void)
1271 {
1272         unsigned long config0;
1273
1274         config0 = read_c0_config();
1275
1276         /* clear all three cache coherency fields */
1277         config0 &= ~(0x7 | (7 << 25) | (7 << 28));
1278         config0 |= (((_page_cachable_default >> _CACHE_SHIFT) <<  0) |
1279                     ((_page_cachable_default >> _CACHE_SHIFT) << 25) |
1280                     ((_page_cachable_default >> _CACHE_SHIFT) << 28));
1281         write_c0_config(config0);
1282         NXP_BARRIER();
1283 }
1284
1285 static int __cpuinitdata cca = -1;
1286
1287 static int __init cca_setup(char *str)
1288 {
1289         get_option(&str, &cca);
1290
1291         return 1;
1292 }
1293
1294 __setup("cca=", cca_setup);
1295
1296 static void __cpuinit coherency_setup(void)
1297 {
1298         if (cca < 0 || cca > 7)
1299                 cca = read_c0_config() & CONF_CM_CMASK;
1300         _page_cachable_default = cca << _CACHE_SHIFT;
1301
1302         pr_debug("Using cache attribute %d\n", cca);
1303         change_c0_config(CONF_CM_CMASK, cca);
1304
1305         /*
1306          * c0_status.cu=0 specifies that updates by the sc instruction use
1307          * the coherency mode specified by the TLB; 1 means cachable
1308          * coherent update on write will be used.  Not all processors have
1309          * this bit and; some wire it to zero, others like Toshiba had the
1310          * silly idea of putting something else there ...
1311          */
1312         switch (current_cpu_type()) {
1313         case CPU_R4000PC:
1314         case CPU_R4000SC:
1315         case CPU_R4000MC:
1316         case CPU_R4400PC:
1317         case CPU_R4400SC:
1318         case CPU_R4400MC:
1319                 clear_c0_config(CONF_CU);
1320                 break;
1321         /*
1322          * We need to catch the early Alchemy SOCs with
1323          * the write-only co_config.od bit and set it back to one on:
1324          * Au1000 rev DA, HA, HB;  Au1100 AB, BA, BC, Au1500 AB
1325          */
1326         case CPU_ALCHEMY:
1327                 au1x00_fixup_config_od();
1328                 break;
1329
1330         case PRID_IMP_PR4450:
1331                 nxp_pr4450_fixup_config();
1332                 break;
1333         }
1334 }
1335
1336 #if defined(CONFIG_DMA_NONCOHERENT)
1337
1338 static int __cpuinitdata coherentio;
1339
1340 static int __init setcoherentio(char *str)
1341 {
1342         coherentio = 1;
1343
1344         return 1;
1345 }
1346
1347 __setup("coherentio", setcoherentio);
1348 #endif
1349
1350 void __cpuinit r4k_cache_init(void)
1351 {
1352         extern void build_clear_page(void);
1353         extern void build_copy_page(void);
1354         extern char __weak except_vec2_generic;
1355         extern char __weak except_vec2_sb1;
1356         struct cpuinfo_mips *c = &current_cpu_data;
1357
1358         switch (c->cputype) {
1359         case CPU_SB1:
1360         case CPU_SB1A:
1361                 set_uncached_handler(0x100, &except_vec2_sb1, 0x80);
1362                 break;
1363
1364         default:
1365                 set_uncached_handler(0x100, &except_vec2_generic, 0x80);
1366                 break;
1367         }
1368
1369         probe_pcache();
1370         setup_scache();
1371
1372         r4k_blast_dcache_page_setup();
1373         r4k_blast_dcache_page_indexed_setup();
1374         r4k_blast_dcache_setup();
1375         r4k_blast_icache_page_setup();
1376         r4k_blast_icache_page_indexed_setup();
1377         r4k_blast_icache_setup();
1378         r4k_blast_scache_page_setup();
1379         r4k_blast_scache_page_indexed_setup();
1380         r4k_blast_scache_setup();
1381
1382         /*
1383          * Some MIPS32 and MIPS64 processors have physically indexed caches.
1384          * This code supports virtually indexed processors and will be
1385          * unnecessarily inefficient on physically indexed processors.
1386          */
1387         if (c->dcache.linesz)
1388                 shm_align_mask = max_t( unsigned long,
1389                                         c->dcache.sets * c->dcache.linesz - 1,
1390                                         PAGE_SIZE - 1);
1391         else
1392                 shm_align_mask = PAGE_SIZE-1;
1393
1394         __flush_cache_vmap      = r4k__flush_cache_vmap;
1395         __flush_cache_vunmap    = r4k__flush_cache_vunmap;
1396
1397         flush_cache_all         = cache_noop;
1398         __flush_cache_all       = r4k___flush_cache_all;
1399         flush_cache_mm          = r4k_flush_cache_mm;
1400         flush_cache_page        = r4k_flush_cache_page;
1401         flush_cache_range       = r4k_flush_cache_range;
1402
1403         flush_cache_sigtramp    = r4k_flush_cache_sigtramp;
1404         flush_icache_all        = r4k_flush_icache_all;
1405         local_flush_data_cache_page     = local_r4k_flush_data_cache_page;
1406         flush_data_cache_page   = r4k_flush_data_cache_page;
1407         flush_icache_range      = r4k_flush_icache_range;
1408         local_flush_icache_range        = local_r4k_flush_icache_range;
1409
1410 #if defined(CONFIG_DMA_NONCOHERENT)
1411         if (coherentio) {
1412                 _dma_cache_wback_inv    = (void *)cache_noop;
1413                 _dma_cache_wback        = (void *)cache_noop;
1414                 _dma_cache_inv          = (void *)cache_noop;
1415         } else {
1416                 _dma_cache_wback_inv    = r4k_dma_cache_wback_inv;
1417                 _dma_cache_wback        = r4k_dma_cache_wback_inv;
1418                 _dma_cache_inv          = r4k_dma_cache_inv;
1419         }
1420 #endif
1421
1422         build_clear_page();
1423         build_copy_page();
1424 #if !defined(CONFIG_MIPS_CMP)
1425         local_r4k___flush_cache_all(NULL);
1426 #endif
1427         coherency_setup();
1428 }