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/config.h>
  11 #include <linux/init.h>
  12 #include <linux/kernel.h>
  13 #include <linux/sched.h>
  14 #include <linux/mm.h>
  15 #include <linux/bitops.h>
  16
  17 #include <asm/bcache.h>
  18 #include <asm/bootinfo.h>
  19 #include <asm/cache.h>
  20 #include <asm/cacheops.h>
  21 #include <asm/cpu.h>
  22 #include <asm/cpu-features.h>
  23 #include <asm/io.h>
  24 #include <asm/page.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/r4kcache.h>
  27 #include <asm/system.h>
  28 #include <asm/mmu_context.h>
  29 #include <asm/war.h>
  30 #include <asm/cacheflush.h> /* for run_uncached() */
  31
  32 /*
  33  * Must die.
  34  */
  35 static unsigned long icache_size __read_mostly;
  36 static unsigned long dcache_size __read_mostly;
  37 static unsigned long scache_size __read_mostly;
  38
  39 /*
  40  * Dummy cache handling routines for machines without boardcaches
  41  */
  42 static void no_sc_noop(void) {}
  43
  44 static struct bcache_ops no_sc_ops = {
  45         .bc_enable = (void *)no_sc_noop,
  46         .bc_disable = (void *)no_sc_noop,
  47         .bc_wback_inv = (void *)no_sc_noop,
  48         .bc_inv = (void *)no_sc_noop
  49 };
  50
  51 struct bcache_ops *bcops = &no_sc_ops;
  52
  53 #define cpu_is_r4600_v1_x()     ((read_c0_prid() & 0xfffffff0) == 0x00002010)
  54 #define cpu_is_r4600_v2_x()     ((read_c0_prid() & 0xfffffff0) == 0x00002020)
  55
  56 #define R4600_HIT_CACHEOP_WAR_IMPL                                      \
  57 do {                                                                    \
  58         if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x())            \
  59                 *(volatile unsigned long *)CKSEG1;                      \
  60         if (R4600_V1_HIT_CACHEOP_WAR)                                   \
  61                 __asm__ __volatile__("nop;nop;nop;nop");                \
  62 } while (0)
  63
  64 static void (*r4k_blast_dcache_page)(unsigned long addr);
  65
  66 static inline void r4k_blast_dcache_page_dc32(unsigned long addr)
  67 {
  68         R4600_HIT_CACHEOP_WAR_IMPL;
  69         blast_dcache32_page(addr);
  70 }
  71
  72 static inline void r4k_blast_dcache_page_setup(void)
  73 {
  74         unsigned long  dc_lsize = cpu_dcache_line_size();
  75
  76         if (dc_lsize == 16)
  77                 r4k_blast_dcache_page = blast_dcache16_page;
  78         else if (dc_lsize == 32)
  79                 r4k_blast_dcache_page = r4k_blast_dcache_page_dc32;
  80 }
  81
  82 static void (* r4k_blast_dcache_page_indexed)(unsigned long addr);
  83
  84 static inline void r4k_blast_dcache_page_indexed_setup(void)
  85 {
  86         unsigned long dc_lsize = cpu_dcache_line_size();
  87
  88         if (dc_lsize == 16)
  89                 r4k_blast_dcache_page_indexed = blast_dcache16_page_indexed;
  90         else if (dc_lsize == 32)
  91                 r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed;
  92 }
  93
  94 static void (* r4k_blast_dcache)(void);
  95
  96 static inline void r4k_blast_dcache_setup(void)
  97 {
  98         unsigned long dc_lsize = cpu_dcache_line_size();
  99
 100         if (dc_lsize == 16)
 101                 r4k_blast_dcache = blast_dcache16;
 102         else if (dc_lsize == 32)
 103                 r4k_blast_dcache = blast_dcache32;
 104 }
 105
 106 /* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
 107 #define JUMP_TO_ALIGN(order) \
 108         __asm__ __volatile__( \
 109                 "b\t1f\n\t" \
 110                 ".align\t" #order "\n\t" \
 111                 "1:\n\t" \
 112                 )
 113 #define CACHE32_UNROLL32_ALIGN  JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
 114 #define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
 115
 116 static inline void blast_r4600_v1_icache32(void)
 117 {
 118         unsigned long flags;
 119
 120         local_irq_save(flags);
 121         blast_icache32();
 122         local_irq_restore(flags);
 123 }
 124
 125 static inline void tx49_blast_icache32(void)
 126 {
 127         unsigned long start = INDEX_BASE;
 128         unsigned long end = start + current_cpu_data.icache.waysize;
 129         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 130         unsigned long ws_end = current_cpu_data.icache.ways <<
 131                                current_cpu_data.icache.waybit;
 132         unsigned long ws, addr;
 133
 134         CACHE32_UNROLL32_ALIGN2;
 135         /* I'm in even chunk.  blast odd chunks */
 136         for (ws = 0; ws < ws_end; ws += ws_inc)
 137                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 138                         cache32_unroll32(addr|ws,Index_Invalidate_I);
 139         CACHE32_UNROLL32_ALIGN;
 140         /* I'm in odd chunk.  blast even chunks */
 141         for (ws = 0; ws < ws_end; ws += ws_inc)
 142                 for (addr = start; addr < end; addr += 0x400 * 2)
 143                         cache32_unroll32(addr|ws,Index_Invalidate_I);
 144 }
 145
 146 static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page)
 147 {
 148         unsigned long flags;
 149
 150         local_irq_save(flags);
 151         blast_icache32_page_indexed(page);
 152         local_irq_restore(flags);
 153 }
 154
 155 static inline void tx49_blast_icache32_page_indexed(unsigned long page)
 156 {
 157         unsigned long start = page;
 158         unsigned long end = start + PAGE_SIZE;
 159         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 160         unsigned long ws_end = current_cpu_data.icache.ways <<
 161                                current_cpu_data.icache.waybit;
 162         unsigned long ws, addr;
 163
 164         CACHE32_UNROLL32_ALIGN2;
 165         /* I'm in even chunk.  blast odd chunks */
 166         for (ws = 0; ws < ws_end; ws += ws_inc)
 167                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 168                         cache32_unroll32(addr|ws,Index_Invalidate_I);
 169         CACHE32_UNROLL32_ALIGN;
 170         /* I'm in odd chunk.  blast even chunks */
 171         for (ws = 0; ws < ws_end; ws += ws_inc)
 172                 for (addr = start; addr < end; addr += 0x400 * 2)
 173                         cache32_unroll32(addr|ws,Index_Invalidate_I);
 174 }
 175
 176 static void (* r4k_blast_icache_page)(unsigned long addr);
 177
 178 static inline void r4k_blast_icache_page_setup(void)
 179 {
 180         unsigned long ic_lsize = cpu_icache_line_size();
 181
 182         if (ic_lsize == 16)
 183                 r4k_blast_icache_page = blast_icache16_page;
 184         else if (ic_lsize == 32)
 185                 r4k_blast_icache_page = blast_icache32_page;
 186         else if (ic_lsize == 64)
 187                 r4k_blast_icache_page = blast_icache64_page;
 188 }
 189
 190
 191 static void (* r4k_blast_icache_page_indexed)(unsigned long addr);
 192
 193 static inline void r4k_blast_icache_page_indexed_setup(void)
 194 {
 195         unsigned long ic_lsize = cpu_icache_line_size();
 196
 197         if (ic_lsize == 16)
 198                 r4k_blast_icache_page_indexed = blast_icache16_page_indexed;
 199         else if (ic_lsize == 32) {
 200                 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
 201                         r4k_blast_icache_page_indexed =
 202                                 blast_icache32_r4600_v1_page_indexed;
 203                 else if (TX49XX_ICACHE_INDEX_INV_WAR)
 204                         r4k_blast_icache_page_indexed =
 205                                 tx49_blast_icache32_page_indexed;
 206                 else
 207                         r4k_blast_icache_page_indexed =
 208                                 blast_icache32_page_indexed;
 209         } else if (ic_lsize == 64)
 210                 r4k_blast_icache_page_indexed = blast_icache64_page_indexed;
 211 }
 212
 213 static void (* r4k_blast_icache)(void);
 214
 215 static inline void r4k_blast_icache_setup(void)
 216 {
 217         unsigned long ic_lsize = cpu_icache_line_size();
 218
 219         if (ic_lsize == 16)
 220                 r4k_blast_icache = blast_icache16;
 221         else if (ic_lsize == 32) {
 222                 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
 223                         r4k_blast_icache = blast_r4600_v1_icache32;
 224                 else if (TX49XX_ICACHE_INDEX_INV_WAR)
 225                         r4k_blast_icache = tx49_blast_icache32;
 226                 else
 227                         r4k_blast_icache = blast_icache32;
 228         } else if (ic_lsize == 64)
 229                 r4k_blast_icache = blast_icache64;
 230 }
 231
 232 static void (* r4k_blast_scache_page)(unsigned long addr);
 233
 234 static inline void r4k_blast_scache_page_setup(void)
 235 {
 236         unsigned long sc_lsize = cpu_scache_line_size();
 237
 238         if (scache_size == 0)
 239                 r4k_blast_scache_page = (void *)no_sc_noop;
 240         else if (sc_lsize == 16)
 241                 r4k_blast_scache_page = blast_scache16_page;
 242         else if (sc_lsize == 32)
 243                 r4k_blast_scache_page = blast_scache32_page;
 244         else if (sc_lsize == 64)
 245                 r4k_blast_scache_page = blast_scache64_page;
 246         else if (sc_lsize == 128)
 247                 r4k_blast_scache_page = blast_scache128_page;
 248 }
 249
 250 static void (* r4k_blast_scache_page_indexed)(unsigned long addr);
 251
 252 static inline void r4k_blast_scache_page_indexed_setup(void)
 253 {
 254         unsigned long sc_lsize = cpu_scache_line_size();
 255
 256         if (scache_size == 0)
 257                 r4k_blast_scache_page_indexed = (void *)no_sc_noop;
 258         else if (sc_lsize == 16)
 259                 r4k_blast_scache_page_indexed = blast_scache16_page_indexed;
 260         else if (sc_lsize == 32)
 261                 r4k_blast_scache_page_indexed = blast_scache32_page_indexed;
 262         else if (sc_lsize == 64)
 263                 r4k_blast_scache_page_indexed = blast_scache64_page_indexed;
 264         else if (sc_lsize == 128)
 265                 r4k_blast_scache_page_indexed = blast_scache128_page_indexed;
 266 }
 267
 268 static void (* r4k_blast_scache)(void);
 269
 270 static inline void r4k_blast_scache_setup(void)
 271 {
 272         unsigned long sc_lsize = cpu_scache_line_size();
 273
 274         if (scache_size == 0)
 275                 r4k_blast_scache = (void *)no_sc_noop;
 276         else if (sc_lsize == 16)
 277                 r4k_blast_scache = blast_scache16;
 278         else if (sc_lsize == 32)
 279                 r4k_blast_scache = blast_scache32;
 280         else if (sc_lsize == 64)
 281                 r4k_blast_scache = blast_scache64;
 282         else if (sc_lsize == 128)
 283                 r4k_blast_scache = blast_scache128;
 284 }
 285
 286 /*
 287  * This is former mm's flush_cache_all() which really should be
 288  * flush_cache_vunmap these days ...
 289  */
 290 static inline void local_r4k_flush_cache_all(void * args)
 291 {
 292         r4k_blast_dcache();
 293         r4k_blast_icache();
 294 }
 295
 296 static void r4k_flush_cache_all(void)
 297 {
 298         if (!cpu_has_dc_aliases)
 299                 return;
 300
 301         on_each_cpu(local_r4k_flush_cache_all, NULL, 1, 1);
 302 }
 303
 304 static inline void local_r4k___flush_cache_all(void * args)
 305 {
 306         r4k_blast_dcache();
 307         r4k_blast_icache();
 308
 309         switch (current_cpu_data.cputype) {
 310         case CPU_R4000SC:
 311         case CPU_R4000MC:
 312         case CPU_R4400SC:
 313         case CPU_R4400MC:
 314         case CPU_R10000:
 315         case CPU_R12000:
 316                 r4k_blast_scache();
 317         }
 318 }
 319
 320 static void r4k___flush_cache_all(void)
 321 {
 322         on_each_cpu(local_r4k___flush_cache_all, NULL, 1, 1);
 323 }
 324
 325 static inline void local_r4k_flush_cache_range(void * args)
 326 {
 327         struct vm_area_struct *vma = args;
 328         int exec;
 329
 330         if (!(cpu_context(smp_processor_id(), vma->vm_mm)))
 331                 return;
 332
 333         exec = vma->vm_flags & VM_EXEC;
 334         if (cpu_has_dc_aliases || exec)
 335                 r4k_blast_dcache();
 336         if (exec)
 337                 r4k_blast_icache();
 338 }
 339
 340 static void r4k_flush_cache_range(struct vm_area_struct *vma,
 341         unsigned long start, unsigned long end)
 342 {
 343         on_each_cpu(local_r4k_flush_cache_range, vma, 1, 1);
 344 }
 345
 346 static inline void local_r4k_flush_cache_mm(void * args)
 347 {
 348         struct mm_struct *mm = args;
 349
 350         if (!cpu_context(smp_processor_id(), mm))
 351                 return;
 352
 353         r4k_blast_dcache();
 354         r4k_blast_icache();
 355
 356         /*
 357          * Kludge alert.  For obscure reasons R4000SC and R4400SC go nuts if we
 358          * only flush the primary caches but R10000 and R12000 behave sane ...
 359          */
 360         if (current_cpu_data.cputype == CPU_R4000SC ||
 361             current_cpu_data.cputype == CPU_R4000MC ||
 362             current_cpu_data.cputype == CPU_R4400SC ||
 363             current_cpu_data.cputype == CPU_R4400MC)
 364                 r4k_blast_scache();
 365 }
 366
 367 static void r4k_flush_cache_mm(struct mm_struct *mm)
 368 {
 369         if (!cpu_has_dc_aliases)
 370                 return;
 371
 372         on_each_cpu(local_r4k_flush_cache_mm, mm, 1, 1);
 373 }
 374
 375 struct flush_cache_page_args {
 376         struct vm_area_struct *vma;
 377         unsigned long addr;
 378         unsigned long pfn;
 379 };
 380
 381 static inline void local_r4k_flush_cache_page(void *args)
 382 {
 383         struct flush_cache_page_args *fcp_args = args;
 384         struct vm_area_struct *vma = fcp_args->vma;
 385         unsigned long addr = fcp_args->addr;
 386         unsigned long paddr = fcp_args->pfn << PAGE_SHIFT;
 387         int exec = vma->vm_flags & VM_EXEC;
 388         struct mm_struct *mm = vma->vm_mm;
 389         pgd_t *pgdp;
 390         pud_t *pudp;
 391         pmd_t *pmdp;
 392         pte_t *ptep;
 393
 394         /*
 395          * If ownes no valid ASID yet, cannot possibly have gotten
 396          * this page into the cache.
 397          */
 398         if (cpu_context(smp_processor_id(), mm) == 0)
 399                 return;
 400
 401         addr &= PAGE_MASK;
 402         pgdp = pgd_offset(mm, addr);
 403         pudp = pud_offset(pgdp, addr);
 404         pmdp = pmd_offset(pudp, addr);
 405         ptep = pte_offset(pmdp, addr);
 406
 407         /*
 408          * If the page isn't marked valid, the page cannot possibly be
 409          * in the cache.
 410          */
 411         if (!(pte_val(*ptep) & _PAGE_PRESENT))
 412                 return;
 413
 414         /*
 415          * Doing flushes for another ASID than the current one is
 416          * too difficult since stupid R4k caches do a TLB translation
 417          * for every cache flush operation.  So we do indexed flushes
 418          * in that case, which doesn't overly flush the cache too much.
 419          */
 420         if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) {
 421                 if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
 422                         r4k_blast_dcache_page(addr);
 423                         if (exec && !cpu_icache_snoops_remote_store)
 424                                 r4k_blast_scache_page(addr);
 425                 }
 426                 if (exec)
 427                         r4k_blast_icache_page(addr);
 428
 429                 return;
 430         }
 431
 432         /*
 433          * Do indexed flush, too much work to get the (possible) TLB refills
 434          * to work correctly.
 435          */
 436         if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
 437                 r4k_blast_dcache_page_indexed(cpu_has_pindexed_dcache ?
 438                                               paddr : addr);
 439                 if (exec && !cpu_icache_snoops_remote_store) {
 440                         r4k_blast_scache_page_indexed(paddr);
 441                 }
 442         }
 443         if (exec) {
 444                 if (cpu_has_vtag_icache) {
 445                         int cpu = smp_processor_id();
 446
 447                         if (cpu_context(cpu, mm) != 0)
 448                                 drop_mmu_context(mm, cpu);
 449                 } else
 450                         r4k_blast_icache_page_indexed(addr);
 451         }
 452 }
 453
 454 static void r4k_flush_cache_page(struct vm_area_struct *vma,
 455         unsigned long addr, unsigned long pfn)
 456 {
 457         struct flush_cache_page_args args;
 458
 459         args.vma = vma;
 460         args.addr = addr;
 461         args.pfn = pfn;
 462
 463         on_each_cpu(local_r4k_flush_cache_page, &args, 1, 1);
 464 }
 465
 466 static inline void local_r4k_flush_data_cache_page(void * addr)
 467 {
 468         r4k_blast_dcache_page((unsigned long) addr);
 469 }
 470
 471 static void r4k_flush_data_cache_page(unsigned long addr)
 472 {
 473         on_each_cpu(local_r4k_flush_data_cache_page, (void *) addr, 1, 1);
 474 }
 475
 476 struct flush_icache_range_args {
 477         unsigned long start;
 478         unsigned long end;
 479 };
 480
 481 static inline void local_r4k_flush_icache_range(void *args)
 482 {
 483         struct flush_icache_range_args *fir_args = args;
 484         unsigned long start = fir_args->start;
 485         unsigned long end = fir_args->end;
 486
 487         if (!cpu_has_ic_fills_f_dc) {
 488                 if (end - start > dcache_size) {
 489                         r4k_blast_dcache();
 490                 } else {
 491                         R4600_HIT_CACHEOP_WAR_IMPL;
 492                         protected_blast_dcache_range(start, end);
 493                 }
 494
 495                 if (!cpu_icache_snoops_remote_store && scache_size) {
 496                         if (end - start > scache_size)
 497                                 r4k_blast_scache();
 498                         else
 499                                 protected_blast_scache_range(start, end);
 500                 }
 501         }
 502
 503         if (end - start > icache_size)
 504                 r4k_blast_icache();
 505         else
 506                 protected_blast_icache_range(start, end);
 507 }
 508
 509 static void r4k_flush_icache_range(unsigned long start, unsigned long end)
 510 {
 511         struct flush_icache_range_args args;
 512
 513         args.start = start;
 514         args.end = end;
 515
 516         on_each_cpu(local_r4k_flush_icache_range, &args, 1, 1);
 517         instruction_hazard();
 518 }
 519
 520 /*
 521  * Ok, this seriously sucks.  We use them to flush a user page but don't
 522  * know the virtual address, so we have to blast away the whole icache
 523  * which is significantly more expensive than the real thing.  Otoh we at
 524  * least know the kernel address of the page so we can flush it
 525  * selectivly.
 526  */
 527
 528 struct flush_icache_page_args {
 529         struct vm_area_struct *vma;
 530         struct page *page;
 531 };
 532
 533 static inline void local_r4k_flush_icache_page(void *args)
 534 {
 535         struct flush_icache_page_args *fip_args = args;
 536         struct vm_area_struct *vma = fip_args->vma;
 537         struct page *page = fip_args->page;
 538
 539         /*
 540          * Tricky ...  Because we don't know the virtual address we've got the
 541          * choice of either invalidating the entire primary and secondary
 542          * caches or invalidating the secondary caches also.  With the subset
 543          * enforcment on R4000SC, R4400SC, R10000 and R12000 invalidating the
 544          * secondary cache will result in any entries in the primary caches
 545          * also getting invalidated which hopefully is a bit more economical.
 546          */
 547         if (cpu_has_subset_pcaches) {
 548                 unsigned long addr = (unsigned long) page_address(page);
 549
 550                 r4k_blast_scache_page(addr);
 551                 ClearPageDcacheDirty(page);
 552
 553                 return;
 554         }
 555
 556         if (!cpu_has_ic_fills_f_dc) {
 557                 unsigned long addr = (unsigned long) page_address(page);
 558                 r4k_blast_dcache_page(addr);
 559                 if (!cpu_icache_snoops_remote_store)
 560                         r4k_blast_scache_page(addr);
 561                 ClearPageDcacheDirty(page);
 562         }
 563
 564         /*
 565          * We're not sure of the virtual address(es) involved here, so
 566          * we have to flush the entire I-cache.
 567          */
 568         if (cpu_has_vtag_icache) {
 569                 int cpu = smp_processor_id();
 570
 571                 if (cpu_context(cpu, vma->vm_mm) != 0)
 572                         drop_mmu_context(vma->vm_mm, cpu);
 573         } else
 574                 r4k_blast_icache();
 575 }
 576
 577 static void r4k_flush_icache_page(struct vm_area_struct *vma,
 578         struct page *page)
 579 {
 580         struct flush_icache_page_args args;
 581
 582         /*
 583          * If there's no context yet, or the page isn't executable, no I-cache
 584          * flush is needed.
 585          */
 586         if (!(vma->vm_flags & VM_EXEC))
 587                 return;
 588
 589         args.vma = vma;
 590         args.page = page;
 591
 592         on_each_cpu(local_r4k_flush_icache_page, &args, 1, 1);
 593 }
 594
 595
 596 #ifdef CONFIG_DMA_NONCOHERENT
 597
 598 static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
 599 {
 600         /* Catch bad driver code */
 601         BUG_ON(size == 0);
 602
 603         if (cpu_has_subset_pcaches) {
 604                 if (size >= scache_size)
 605                         r4k_blast_scache();
 606                 else
 607                         blast_scache_range(addr, addr + size);
 608                 return;
 609         }
 610
 611         /*
 612          * Either no secondary cache or the available caches don't have the
 613          * subset property so we have to flush the primary caches
 614          * explicitly
 615          */
 616         if (size >= dcache_size) {
 617                 r4k_blast_dcache();
 618         } else {
 619                 R4600_HIT_CACHEOP_WAR_IMPL;
 620                 blast_dcache_range(addr, addr + size);
 621         }
 622
 623         bc_wback_inv(addr, size);
 624 }
 625
 626 static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
 627 {
 628         /* Catch bad driver code */
 629         BUG_ON(size == 0);
 630
 631         if (cpu_has_subset_pcaches) {
 632                 if (size >= scache_size)
 633                         r4k_blast_scache();
 634                 else
 635                         blast_scache_range(addr, addr + size);
 636                 return;
 637         }
 638
 639         if (size >= dcache_size) {
 640                 r4k_blast_dcache();
 641         } else {
 642                 R4600_HIT_CACHEOP_WAR_IMPL;
 643                 blast_dcache_range(addr, addr + size);
 644         }
 645
 646         bc_inv(addr, size);
 647 }
 648 #endif /* CONFIG_DMA_NONCOHERENT */
 649
 650 /*
 651  * While we're protected against bad userland addresses we don't care
 652  * very much about what happens in that case.  Usually a segmentation
 653  * fault will dump the process later on anyway ...
 654  */
 655 static void local_r4k_flush_cache_sigtramp(void * arg)
 656 {
 657         unsigned long ic_lsize = cpu_icache_line_size();
 658         unsigned long dc_lsize = cpu_dcache_line_size();
 659         unsigned long sc_lsize = cpu_scache_line_size();
 660         unsigned long addr = (unsigned long) arg;
 661
 662         R4600_HIT_CACHEOP_WAR_IMPL;
 663         protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
 664         if (!cpu_icache_snoops_remote_store && scache_size)
 665                 protected_writeback_scache_line(addr & ~(sc_lsize - 1));
 666         protected_flush_icache_line(addr & ~(ic_lsize - 1));
 667         if (MIPS4K_ICACHE_REFILL_WAR) {
 668                 __asm__ __volatile__ (
 669                         ".set push\n\t"
 670                         ".set noat\n\t"
 671                         ".set mips3\n\t"
 672 #ifdef CONFIG_32BIT
 673                         "la     $at,1f\n\t"
 674 #endif
 675 #ifdef CONFIG_64BIT
 676                         "dla    $at,1f\n\t"
 677 #endif
 678                         "cache  %0,($at)\n\t"
 679                         "nop; nop; nop\n"
 680                         "1:\n\t"
 681                         ".set pop"
 682                         :
 683                         : "i" (Hit_Invalidate_I));
 684         }
 685         if (MIPS_CACHE_SYNC_WAR)
 686                 __asm__ __volatile__ ("sync");
 687 }
 688
 689 static void r4k_flush_cache_sigtramp(unsigned long addr)
 690 {
 691         on_each_cpu(local_r4k_flush_cache_sigtramp, (void *) addr, 1, 1);
 692 }
 693
 694 static void r4k_flush_icache_all(void)
 695 {
 696         if (cpu_has_vtag_icache)
 697                 r4k_blast_icache();
 698 }
 699
 700 static inline void rm7k_erratum31(void)
 701 {
 702         const unsigned long ic_lsize = 32;
 703         unsigned long addr;
 704
 705         /* RM7000 erratum #31. The icache is screwed at startup. */
 706         write_c0_taglo(0);
 707         write_c0_taghi(0);
 708
 709         for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) {
 710                 __asm__ __volatile__ (
 711                         ".set push\n\t"
 712                         ".set noreorder\n\t"
 713                         ".set mips3\n\t"
 714                         "cache\t%1, 0(%0)\n\t"
 715                         "cache\t%1, 0x1000(%0)\n\t"
 716                         "cache\t%1, 0x2000(%0)\n\t"
 717                         "cache\t%1, 0x3000(%0)\n\t"
 718                         "cache\t%2, 0(%0)\n\t"
 719                         "cache\t%2, 0x1000(%0)\n\t"
 720                         "cache\t%2, 0x2000(%0)\n\t"
 721                         "cache\t%2, 0x3000(%0)\n\t"
 722                         "cache\t%1, 0(%0)\n\t"
 723                         "cache\t%1, 0x1000(%0)\n\t"
 724                         "cache\t%1, 0x2000(%0)\n\t"
 725                         "cache\t%1, 0x3000(%0)\n\t"
 726                         ".set pop\n"
 727                         :
 728                         : "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill));
 729         }
 730 }
 731
 732 static char *way_string[] __initdata = { NULL, "direct mapped", "2-way",
 733         "3-way", "4-way", "5-way", "6-way", "7-way", "8-way"
 734 };
 735
 736 static void __init probe_pcache(void)
 737 {
 738         struct cpuinfo_mips *c = &current_cpu_data;
 739         unsigned int config = read_c0_config();
 740         unsigned int prid = read_c0_prid();
 741         unsigned long config1;
 742         unsigned int lsize;
 743
 744         switch (c->cputype) {
 745         case CPU_R4600:                 /* QED style two way caches? */
 746         case CPU_R4700:
 747         case CPU_R5000:
 748         case CPU_NEVADA:
 749                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 750                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 751                 c->icache.ways = 2;
 752                 c->icache.waybit = ffs(icache_size/2) - 1;
 753
 754                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 755                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 756                 c->dcache.ways = 2;
 757                 c->dcache.waybit= ffs(dcache_size/2) - 1;
 758
 759                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 760                 break;
 761
 762         case CPU_R5432:
 763         case CPU_R5500:
 764                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 765                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 766                 c->icache.ways = 2;
 767                 c->icache.waybit= 0;
 768
 769                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 770                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 771                 c->dcache.ways = 2;
 772                 c->dcache.waybit = 0;
 773
 774                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 775                 break;
 776
 777         case CPU_TX49XX:
 778                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 779                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 780                 c->icache.ways = 4;
 781                 c->icache.waybit= 0;
 782
 783                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 784                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 785                 c->dcache.ways = 4;
 786                 c->dcache.waybit = 0;
 787
 788                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 789                 c->options |= MIPS_CPU_PREFETCH;
 790                 break;
 791
 792         case CPU_R4000PC:
 793         case CPU_R4000SC:
 794         case CPU_R4000MC:
 795         case CPU_R4400PC:
 796         case CPU_R4400SC:
 797         case CPU_R4400MC:
 798         case CPU_R4300:
 799                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 800                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 801                 c->icache.ways = 1;
 802                 c->icache.waybit = 0;   /* doesn't matter */
 803
 804                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 805                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 806                 c->dcache.ways = 1;
 807                 c->dcache.waybit = 0;   /* does not matter */
 808
 809                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 810                 break;
 811
 812         case CPU_R10000:
 813         case CPU_R12000:
 814                 icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29));
 815                 c->icache.linesz = 64;
 816                 c->icache.ways = 2;
 817                 c->icache.waybit = 0;
 818
 819                 dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26));
 820                 c->dcache.linesz = 32;
 821                 c->dcache.ways = 2;
 822                 c->dcache.waybit = 0;
 823
 824                 c->options |= MIPS_CPU_PREFETCH;
 825                 break;
 826
 827         case CPU_VR4133:
 828                 write_c0_config(config & ~CONF_EB);
 829         case CPU_VR4131:
 830                 /* Workaround for cache instruction bug of VR4131 */
 831                 if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U ||
 832                     c->processor_id == 0x0c82U) {
 833                         config &= ~0x00000030U;
 834                         config |= 0x00410000U;
 835                         write_c0_config(config);
 836                 }
 837                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
 838                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 839                 c->icache.ways = 2;
 840                 c->icache.waybit = ffs(icache_size/2) - 1;
 841
 842                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
 843                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 844                 c->dcache.ways = 2;
 845                 c->dcache.waybit = ffs(dcache_size/2) - 1;
 846
 847                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 848                 break;
 849
 850         case CPU_VR41XX:
 851         case CPU_VR4111:
 852         case CPU_VR4121:
 853         case CPU_VR4122:
 854         case CPU_VR4181:
 855         case CPU_VR4181A:
 856                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
 857                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 858                 c->icache.ways = 1;
 859                 c->icache.waybit = 0;   /* doesn't matter */
 860
 861                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
 862                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 863                 c->dcache.ways = 1;
 864                 c->dcache.waybit = 0;   /* does not matter */
 865
 866                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 867                 break;
 868
 869         case CPU_RM7000:
 870                 rm7k_erratum31();
 871
 872         case CPU_RM9000:
 873                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 874                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 875                 c->icache.ways = 4;
 876                 c->icache.waybit = ffs(icache_size / c->icache.ways) - 1;
 877
 878                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 879                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 880                 c->dcache.ways = 4;
 881                 c->dcache.waybit = ffs(dcache_size / c->dcache.ways) - 1;
 882
 883 #if !defined(CONFIG_SMP) || !defined(RM9000_CDEX_SMP_WAR)
 884                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 885 #endif
 886                 c->options |= MIPS_CPU_PREFETCH;
 887                 break;
 888
 889         default:
 890                 if (!(config & MIPS_CONF_M))
 891                         panic("Don't know how to probe P-caches on this cpu.");
 892
 893                 /*
 894                  * So we seem to be a MIPS32 or MIPS64 CPU
 895                  * So let's probe the I-cache ...
 896                  */
 897                 config1 = read_c0_config1();
 898
 899                 if ((lsize = ((config1 >> 19) & 7)))
 900                         c->icache.linesz = 2 << lsize;
 901                 else
 902                         c->icache.linesz = lsize;
 903                 c->icache.sets = 64 << ((config1 >> 22) & 7);
 904                 c->icache.ways = 1 + ((config1 >> 16) & 7);
 905
 906                 icache_size = c->icache.sets *
 907                               c->icache.ways *
 908                               c->icache.linesz;
 909                 c->icache.waybit = ffs(icache_size/c->icache.ways) - 1;
 910
 911                 if (config & 0x8)               /* VI bit */
 912                         c->icache.flags |= MIPS_CACHE_VTAG;
 913
 914                 /*
 915                  * Now probe the MIPS32 / MIPS64 data cache.
 916                  */
 917                 c->dcache.flags = 0;
 918
 919                 if ((lsize = ((config1 >> 10) & 7)))
 920                         c->dcache.linesz = 2 << lsize;
 921                 else
 922                         c->dcache.linesz= lsize;
 923                 c->dcache.sets = 64 << ((config1 >> 13) & 7);
 924                 c->dcache.ways = 1 + ((config1 >> 7) & 7);
 925
 926                 dcache_size = c->dcache.sets *
 927                               c->dcache.ways *
 928                               c->dcache.linesz;
 929                 c->dcache.waybit = ffs(dcache_size/c->dcache.ways) - 1;
 930
 931                 c->options |= MIPS_CPU_PREFETCH;
 932                 break;
 933         }
 934
 935         /*
 936          * Processor configuration sanity check for the R4000SC erratum
 937          * #5.  With page sizes larger than 32kB there is no possibility
 938          * to get a VCE exception anymore so we don't care about this
 939          * misconfiguration.  The case is rather theoretical anyway;
 940          * presumably no vendor is shipping his hardware in the "bad"
 941          * configuration.
 942          */
 943         if ((prid & 0xff00) == PRID_IMP_R4000 && (prid & 0xff) < 0x40 &&
 944             !(config & CONF_SC) && c->icache.linesz != 16 &&
 945             PAGE_SIZE <= 0x8000)
 946                 panic("Improper R4000SC processor configuration detected");
 947
 948         /* compute a couple of other cache variables */
 949         c->icache.waysize = icache_size / c->icache.ways;
 950         c->dcache.waysize = dcache_size / c->dcache.ways;
 951
 952         c->icache.sets = icache_size / (c->icache.linesz * c->icache.ways);
 953         c->dcache.sets = dcache_size / (c->dcache.linesz * c->dcache.ways);
 954
 955         /*
 956          * R10000 and R12000 P-caches are odd in a positive way.  They're 32kB
 957          * 2-way virtually indexed so normally would suffer from aliases.  So
 958          * normally they'd suffer from aliases but magic in the hardware deals
 959          * with that for us so we don't need to take care ourselves.
 960          */
 961         switch (c->cputype) {
 962         case CPU_20KC:
 963         case CPU_25KF:
 964                 c->dcache.flags |= MIPS_CACHE_PINDEX;
 965         case CPU_R10000:
 966         case CPU_R12000:
 967         case CPU_SB1:
 968                 break;
 969         case CPU_24K:
 970                 if (!(read_c0_config7() & (1 << 16)))
 971         default:
 972                         if (c->dcache.waysize > PAGE_SIZE)
 973                                 c->dcache.flags |= MIPS_CACHE_ALIASES;
 974         }
 975
 976         switch (c->cputype) {
 977         case CPU_20KC:
 978                 /*
 979                  * Some older 20Kc chips doesn't have the 'VI' bit in
 980                  * the config register.
 981                  */
 982                 c->icache.flags |= MIPS_CACHE_VTAG;
 983                 break;
 984
 985         case CPU_AU1000:
 986         case CPU_AU1500:
 987         case CPU_AU1100:
 988         case CPU_AU1550:
 989         case CPU_AU1200:
 990                 c->icache.flags |= MIPS_CACHE_IC_F_DC;
 991                 break;
 992         }
 993
 994         printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
 995                icache_size >> 10,
 996                cpu_has_vtag_icache ? "virtually tagged" : "physically tagged",
 997                way_string[c->icache.ways], c->icache.linesz);
 998
 999         printk("Primary data cache %ldkB, %s, linesize %d bytes.\n",
1000                dcache_size >> 10, way_string[c->dcache.ways], c->dcache.linesz);
1001 }
1002
1003 /*
1004  * If you even _breathe_ on this function, look at the gcc output and make sure
1005  * it does not pop things on and off the stack for the cache sizing loop that
1006  * executes in KSEG1 space or else you will crash and burn badly.  You have
1007  * been warned.
1008  */
1009 static int __init probe_scache(void)
1010 {
1011         extern unsigned long stext;
1012         unsigned long flags, addr, begin, end, pow2;
1013         unsigned int config = read_c0_config();
1014         struct cpuinfo_mips *c = &current_cpu_data;
1015         int tmp;
1016
1017         if (config & CONF_SC)
1018                 return 0;
1019
1020         begin = (unsigned long) &stext;
1021         begin &= ~((4 * 1024 * 1024) - 1);
1022         end = begin + (4 * 1024 * 1024);
1023
1024         /*
1025          * This is such a bitch, you'd think they would make it easy to do
1026          * this.  Away you daemons of stupidity!
1027          */
1028         local_irq_save(flags);
1029
1030         /* Fill each size-multiple cache line with a valid tag. */
1031         pow2 = (64 * 1024);
1032         for (addr = begin; addr < end; addr = (begin + pow2)) {
1033                 unsigned long *p = (unsigned long *) addr;
1034                 __asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
1035                 pow2 <<= 1;
1036         }
1037
1038         /* Load first line with zero (therefore invalid) tag. */
1039         write_c0_taglo(0);
1040         write_c0_taghi(0);
1041         __asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
1042         cache_op(Index_Store_Tag_I, begin);
1043         cache_op(Index_Store_Tag_D, begin);
1044         cache_op(Index_Store_Tag_SD, begin);
1045
1046         /* Now search for the wrap around point. */
1047         pow2 = (128 * 1024);
1048         tmp = 0;
1049         for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) {
1050                 cache_op(Index_Load_Tag_SD, addr);
1051                 __asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
1052                 if (!read_c0_taglo())
1053                         break;
1054                 pow2 <<= 1;
1055         }
1056         local_irq_restore(flags);
1057         addr -= begin;
1058
1059         scache_size = addr;
1060         c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22);
1061         c->scache.ways = 1;
1062         c->dcache.waybit = 0;           /* does not matter */
1063
1064         return 1;
1065 }
1066
1067 extern int r5k_sc_init(void);
1068 extern int rm7k_sc_init(void);
1069
1070 static void __init setup_scache(void)
1071 {
1072         struct cpuinfo_mips *c = &current_cpu_data;
1073         unsigned int config = read_c0_config();
1074         int sc_present = 0;
1075
1076         /*
1077          * Do the probing thing on R4000SC and R4400SC processors.  Other
1078          * processors don't have a S-cache that would be relevant to the
1079          * Linux memory managment.
1080          */
1081         switch (c->cputype) {
1082         case CPU_R4000SC:
1083         case CPU_R4000MC:
1084         case CPU_R4400SC:
1085         case CPU_R4400MC:
1086                 sc_present = run_uncached(probe_scache);
1087                 if (sc_present)
1088                         c->options |= MIPS_CPU_CACHE_CDEX_S;
1089                 break;
1090
1091         case CPU_R10000:
1092         case CPU_R12000:
1093                 scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16);
1094                 c->scache.linesz = 64 << ((config >> 13) & 1);
1095                 c->scache.ways = 2;
1096                 c->scache.waybit= 0;
1097                 sc_present = 1;
1098                 break;
1099
1100         case CPU_R5000:
1101         case CPU_NEVADA:
1102 #ifdef CONFIG_R5000_CPU_SCACHE
1103                 r5k_sc_init();
1104 #endif
1105                 return;
1106
1107         case CPU_RM7000:
1108         case CPU_RM9000:
1109 #ifdef CONFIG_RM7000_CPU_SCACHE
1110                 rm7k_sc_init();
1111 #endif
1112                 return;
1113
1114         default:
1115                 sc_present = 0;
1116         }
1117
1118         if (!sc_present)
1119                 return;
1120
1121         if ((c->isa_level == MIPS_CPU_ISA_M32R1 ||
1122              c->isa_level == MIPS_CPU_ISA_M64R1) &&
1123             !(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
1124                 panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
1125
1126         /* compute a couple of other cache variables */
1127         c->scache.waysize = scache_size / c->scache.ways;
1128
1129         c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1130
1131         printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1132                scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1133
1134         c->options |= MIPS_CPU_SUBSET_CACHES;
1135 }
1136
1137 static inline void coherency_setup(void)
1138 {
1139         change_c0_config(CONF_CM_CMASK, CONF_CM_DEFAULT);
1140
1141         /*
1142          * c0_status.cu=0 specifies that updates by the sc instruction use
1143          * the coherency mode specified by the TLB; 1 means cachable
1144          * coherent update on write will be used.  Not all processors have
1145          * this bit and; some wire it to zero, others like Toshiba had the
1146          * silly idea of putting something else there ...
1147          */
1148         switch (current_cpu_data.cputype) {
1149         case CPU_R4000PC:
1150         case CPU_R4000SC:
1151         case CPU_R4000MC:
1152         case CPU_R4400PC:
1153         case CPU_R4400SC:
1154         case CPU_R4400MC:
1155                 clear_c0_config(CONF_CU);
1156                 break;
1157         }
1158 }
1159
1160 void __init r4k_cache_init(void)
1161 {
1162         extern void build_clear_page(void);
1163         extern void build_copy_page(void);
1164         extern char except_vec2_generic;
1165         struct cpuinfo_mips *c = &current_cpu_data;
1166
1167         /* Default cache error handler for R4000 and R5000 family */
1168         set_uncached_handler (0x100, &except_vec2_generic, 0x80);
1169
1170         probe_pcache();
1171         setup_scache();
1172
1173         r4k_blast_dcache_page_setup();
1174         r4k_blast_dcache_page_indexed_setup();
1175         r4k_blast_dcache_setup();
1176         r4k_blast_icache_page_setup();
1177         r4k_blast_icache_page_indexed_setup();
1178         r4k_blast_icache_setup();
1179         r4k_blast_scache_page_setup();
1180         r4k_blast_scache_page_indexed_setup();
1181         r4k_blast_scache_setup();
1182
1183         /*
1184          * Some MIPS32 and MIPS64 processors have physically indexed caches.
1185          * This code supports virtually indexed processors and will be
1186          * unnecessarily inefficient on physically indexed processors.
1187          */
1188         shm_align_mask = max_t( unsigned long,
1189                                 c->dcache.sets * c->dcache.linesz - 1,
1190                                 PAGE_SIZE - 1);
1191
1192         flush_cache_all         = r4k_flush_cache_all;
1193         __flush_cache_all       = r4k___flush_cache_all;
1194         flush_cache_mm          = r4k_flush_cache_mm;
1195         flush_cache_page        = r4k_flush_cache_page;
1196         flush_icache_page       = r4k_flush_icache_page;
1197         flush_cache_range       = r4k_flush_cache_range;
1198
1199         flush_cache_sigtramp    = r4k_flush_cache_sigtramp;
1200         flush_icache_all        = r4k_flush_icache_all;
1201         flush_data_cache_page   = r4k_flush_data_cache_page;
1202         flush_icache_range      = r4k_flush_icache_range;
1203
1204 #ifdef CONFIG_DMA_NONCOHERENT
1205         _dma_cache_wback_inv    = r4k_dma_cache_wback_inv;
1206         _dma_cache_wback        = r4k_dma_cache_wback_inv;
1207         _dma_cache_inv          = r4k_dma_cache_inv;
1208 #endif
1209
1210         build_clear_page();
1211         build_copy_page();
1212         local_r4k___flush_cache_all(NULL);
1213         coherency_setup();
1214 }