arch/mips/mm/c-r4k.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
   7  * Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Ralf Baechle (ralf@gnu.org)
   8  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
   9  */
  10 #include <linux/cpu_pm.h>
  11 #include <linux/hardirq.h>
  12 #include <linux/init.h>
  13 #include <linux/highmem.h>
  14 #include <linux/kernel.h>
  15 #include <linux/linkage.h>
  16 #include <linux/preempt.h>
  17 #include <linux/sched.h>
  18 #include <linux/smp.h>
  19 #include <linux/mm.h>
  20 #include <linux/export.h>
  21 #include <linux/bitops.h>
  22
  23 #include <asm/bcache.h>
  24 #include <asm/bootinfo.h>
  25 #include <asm/cache.h>
  26 #include <asm/cacheops.h>
  27 #include <asm/cpu.h>
  28 #include <asm/cpu-features.h>
  29 #include <asm/cpu-type.h>
  30 #include <asm/io.h>
  31 #include <asm/page.h>
  32 #include <asm/r4kcache.h>
  33 #include <asm/sections.h>
  34 #include <asm/mmu_context.h>
  35 #include <asm/war.h>
  36 #include <asm/cacheflush.h> /* for run_uncached() */
  37 #include <asm/traps.h>
  38 #include <asm/dma-coherence.h>
  39 #include <asm/mips-cps.h>
  40
  41 /*
  42  * Bits describing what cache ops an SMP callback function may perform.
  43  *
  44  * R4K_HIT   -  Virtual user or kernel address based cache operations. The
  45  *              active_mm must be checked before using user addresses, falling
  46  *              back to kmap.
  47  * R4K_INDEX -  Index based cache operations.
  48  */
  49
  50 #define R4K_HIT         BIT(0)
  51 #define R4K_INDEX       BIT(1)
  52
  53 /**
  54  * r4k_op_needs_ipi() - Decide if a cache op needs to be done on every core.
  55  * @type:       Type of cache operations (R4K_HIT or R4K_INDEX).
  56  *
  57  * Decides whether a cache op needs to be performed on every core in the system.
  58  * This may change depending on the @type of cache operation, as well as the set
  59  * of online CPUs, so preemption should be disabled by the caller to prevent CPU
  60  * hotplug from changing the result.
  61  *
  62  * Returns:     1 if the cache operation @type should be done on every core in
  63  *              the system.
  64  *              0 if the cache operation @type is globalized and only needs to
  65  *              be performed on a simple CPU.
  66  */
  67 static inline bool r4k_op_needs_ipi(unsigned int type)
  68 {
  69         /* The MIPS Coherence Manager (CM) globalizes address-based cache ops */
  70         if (type == R4K_HIT && mips_cm_present())
  71                 return false;
  72
  73         /*
  74          * Hardware doesn't globalize the required cache ops, so SMP calls may
  75          * be needed, but only if there are foreign CPUs (non-siblings with
  76          * separate caches).
  77          */
  78         /* cpu_foreign_map[] undeclared when !CONFIG_SMP */
  79 #ifdef CONFIG_SMP
  80         return !cpumask_empty(&cpu_foreign_map[0]);
  81 #else
  82         return false;
  83 #endif
  84 }
  85
  86 /*
  87  * Special Variant of smp_call_function for use by cache functions:
  88  *
  89  *  o No return value
  90  *  o collapses to normal function call on UP kernels
  91  *  o collapses to normal function call on systems with a single shared
  92  *    primary cache.
  93  *  o doesn't disable interrupts on the local CPU
  94  */
  95 static inline void r4k_on_each_cpu(unsigned int type,
  96                                    void (*func)(void *info), void *info)
  97 {
  98         preempt_disable();
  99         if (r4k_op_needs_ipi(type))
 100                 smp_call_function_many(&cpu_foreign_map[smp_processor_id()],
 101                                        func, info, 1);
 102         func(info);
 103         preempt_enable();
 104 }
 105
 106 /*
 107  * Must die.
 108  */
 109 static unsigned long icache_size __read_mostly;
 110 static unsigned long dcache_size __read_mostly;
 111 static unsigned long vcache_size __read_mostly;
 112 static unsigned long scache_size __read_mostly;
 113
 114 /*
 115  * Dummy cache handling routines for machines without boardcaches
 116  */
 117 static void cache_noop(void) {}
 118
 119 static struct bcache_ops no_sc_ops = {
 120         .bc_enable = (void *)cache_noop,
 121         .bc_disable = (void *)cache_noop,
 122         .bc_wback_inv = (void *)cache_noop,
 123         .bc_inv = (void *)cache_noop
 124 };
 125
 126 struct bcache_ops *bcops = &no_sc_ops;
 127
 128 #define cpu_is_r4600_v1_x()     ((read_c0_prid() & 0xfffffff0) == 0x00002010)
 129 #define cpu_is_r4600_v2_x()     ((read_c0_prid() & 0xfffffff0) == 0x00002020)
 130
 131 #define R4600_HIT_CACHEOP_WAR_IMPL                                      \
 132 do {                                                                    \
 133         if (IS_ENABLED(CONFIG_WAR_R4600_V2_HIT_CACHEOP) &&              \
 134             cpu_is_r4600_v2_x())                                        \
 135                 *(volatile unsigned long *)CKSEG1;                      \
 136         if (IS_ENABLED(CONFIG_WAR_R4600_V1_HIT_CACHEOP))                                        \
 137                 __asm__ __volatile__("nop;nop;nop;nop");                \
 138 } while (0)
 139
 140 static void (*r4k_blast_dcache_page)(unsigned long addr);
 141
 142 static inline void r4k_blast_dcache_page_dc32(unsigned long addr)
 143 {
 144         R4600_HIT_CACHEOP_WAR_IMPL;
 145         blast_dcache32_page(addr);
 146 }
 147
 148 static inline void r4k_blast_dcache_page_dc64(unsigned long addr)
 149 {
 150         blast_dcache64_page(addr);
 151 }
 152
 153 static inline void r4k_blast_dcache_page_dc128(unsigned long addr)
 154 {
 155         blast_dcache128_page(addr);
 156 }
 157
 158 static void r4k_blast_dcache_page_setup(void)
 159 {
 160         unsigned long  dc_lsize = cpu_dcache_line_size();
 161
 162         switch (dc_lsize) {
 163         case 0:
 164                 r4k_blast_dcache_page = (void *)cache_noop;
 165                 break;
 166         case 16:
 167                 r4k_blast_dcache_page = blast_dcache16_page;
 168                 break;
 169         case 32:
 170                 r4k_blast_dcache_page = r4k_blast_dcache_page_dc32;
 171                 break;
 172         case 64:
 173                 r4k_blast_dcache_page = r4k_blast_dcache_page_dc64;
 174                 break;
 175         case 128:
 176                 r4k_blast_dcache_page = r4k_blast_dcache_page_dc128;
 177                 break;
 178         default:
 179                 break;
 180         }
 181 }
 182
 183 #ifndef CONFIG_EVA
 184 #define r4k_blast_dcache_user_page  r4k_blast_dcache_page
 185 #else
 186
 187 static void (*r4k_blast_dcache_user_page)(unsigned long addr);
 188
 189 static void r4k_blast_dcache_user_page_setup(void)
 190 {
 191         unsigned long  dc_lsize = cpu_dcache_line_size();
 192
 193         if (dc_lsize == 0)
 194                 r4k_blast_dcache_user_page = (void *)cache_noop;
 195         else if (dc_lsize == 16)
 196                 r4k_blast_dcache_user_page = blast_dcache16_user_page;
 197         else if (dc_lsize == 32)
 198                 r4k_blast_dcache_user_page = blast_dcache32_user_page;
 199         else if (dc_lsize == 64)
 200                 r4k_blast_dcache_user_page = blast_dcache64_user_page;
 201 }
 202
 203 #endif
 204
 205 static void (* r4k_blast_dcache_page_indexed)(unsigned long addr);
 206
 207 static void r4k_blast_dcache_page_indexed_setup(void)
 208 {
 209         unsigned long dc_lsize = cpu_dcache_line_size();
 210
 211         if (dc_lsize == 0)
 212                 r4k_blast_dcache_page_indexed = (void *)cache_noop;
 213         else if (dc_lsize == 16)
 214                 r4k_blast_dcache_page_indexed = blast_dcache16_page_indexed;
 215         else if (dc_lsize == 32)
 216                 r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed;
 217         else if (dc_lsize == 64)
 218                 r4k_blast_dcache_page_indexed = blast_dcache64_page_indexed;
 219         else if (dc_lsize == 128)
 220                 r4k_blast_dcache_page_indexed = blast_dcache128_page_indexed;
 221 }
 222
 223 void (* r4k_blast_dcache)(void);
 224 EXPORT_SYMBOL(r4k_blast_dcache);
 225
 226 static void r4k_blast_dcache_setup(void)
 227 {
 228         unsigned long dc_lsize = cpu_dcache_line_size();
 229
 230         if (dc_lsize == 0)
 231                 r4k_blast_dcache = (void *)cache_noop;
 232         else if (dc_lsize == 16)
 233                 r4k_blast_dcache = blast_dcache16;
 234         else if (dc_lsize == 32)
 235                 r4k_blast_dcache = blast_dcache32;
 236         else if (dc_lsize == 64)
 237                 r4k_blast_dcache = blast_dcache64;
 238         else if (dc_lsize == 128)
 239                 r4k_blast_dcache = blast_dcache128;
 240 }
 241
 242 /* force code alignment (used for CONFIG_WAR_TX49XX_ICACHE_INDEX_INV) */
 243 #define JUMP_TO_ALIGN(order) \
 244         __asm__ __volatile__( \
 245                 "b\t1f\n\t" \
 246                 ".align\t" #order "\n\t" \
 247                 "1:\n\t" \
 248                 )
 249 #define CACHE32_UNROLL32_ALIGN  JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
 250 #define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
 251
 252 static inline void blast_r4600_v1_icache32(void)
 253 {
 254         unsigned long flags;
 255
 256         local_irq_save(flags);
 257         blast_icache32();
 258         local_irq_restore(flags);
 259 }
 260
 261 static inline void tx49_blast_icache32(void)
 262 {
 263         unsigned long start = INDEX_BASE;
 264         unsigned long end = start + current_cpu_data.icache.waysize;
 265         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 266         unsigned long ws_end = current_cpu_data.icache.ways <<
 267                                current_cpu_data.icache.waybit;
 268         unsigned long ws, addr;
 269
 270         CACHE32_UNROLL32_ALIGN2;
 271         /* I'm in even chunk.  blast odd chunks */
 272         for (ws = 0; ws < ws_end; ws += ws_inc)
 273                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 274                         cache_unroll(32, kernel_cache, Index_Invalidate_I,
 275                                      addr | ws, 32);
 276         CACHE32_UNROLL32_ALIGN;
 277         /* I'm in odd chunk.  blast even chunks */
 278         for (ws = 0; ws < ws_end; ws += ws_inc)
 279                 for (addr = start; addr < end; addr += 0x400 * 2)
 280                         cache_unroll(32, kernel_cache, Index_Invalidate_I,
 281                                      addr | ws, 32);
 282 }
 283
 284 static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page)
 285 {
 286         unsigned long flags;
 287
 288         local_irq_save(flags);
 289         blast_icache32_page_indexed(page);
 290         local_irq_restore(flags);
 291 }
 292
 293 static inline void tx49_blast_icache32_page_indexed(unsigned long page)
 294 {
 295         unsigned long indexmask = current_cpu_data.icache.waysize - 1;
 296         unsigned long start = INDEX_BASE + (page & indexmask);
 297         unsigned long end = start + PAGE_SIZE;
 298         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 299         unsigned long ws_end = current_cpu_data.icache.ways <<
 300                                current_cpu_data.icache.waybit;
 301         unsigned long ws, addr;
 302
 303         CACHE32_UNROLL32_ALIGN2;
 304         /* I'm in even chunk.  blast odd chunks */
 305         for (ws = 0; ws < ws_end; ws += ws_inc)
 306                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 307                         cache_unroll(32, kernel_cache, Index_Invalidate_I,
 308                                      addr | ws, 32);
 309         CACHE32_UNROLL32_ALIGN;
 310         /* I'm in odd chunk.  blast even chunks */
 311         for (ws = 0; ws < ws_end; ws += ws_inc)
 312                 for (addr = start; addr < end; addr += 0x400 * 2)
 313                         cache_unroll(32, kernel_cache, Index_Invalidate_I,
 314                                      addr | ws, 32);
 315 }
 316
 317 static void (* r4k_blast_icache_page)(unsigned long addr);
 318
 319 static void r4k_blast_icache_page_setup(void)
 320 {
 321         unsigned long ic_lsize = cpu_icache_line_size();
 322
 323         if (ic_lsize == 0)
 324                 r4k_blast_icache_page = (void *)cache_noop;
 325         else if (ic_lsize == 16)
 326                 r4k_blast_icache_page = blast_icache16_page;
 327         else if (ic_lsize == 32 && current_cpu_type() == CPU_LOONGSON2EF)
 328                 r4k_blast_icache_page = loongson2_blast_icache32_page;
 329         else if (ic_lsize == 32)
 330                 r4k_blast_icache_page = blast_icache32_page;
 331         else if (ic_lsize == 64)
 332                 r4k_blast_icache_page = blast_icache64_page;
 333         else if (ic_lsize == 128)
 334                 r4k_blast_icache_page = blast_icache128_page;
 335 }
 336
 337 #ifndef CONFIG_EVA
 338 #define r4k_blast_icache_user_page  r4k_blast_icache_page
 339 #else
 340
 341 static void (*r4k_blast_icache_user_page)(unsigned long addr);
 342
 343 static void r4k_blast_icache_user_page_setup(void)
 344 {
 345         unsigned long ic_lsize = cpu_icache_line_size();
 346
 347         if (ic_lsize == 0)
 348                 r4k_blast_icache_user_page = (void *)cache_noop;
 349         else if (ic_lsize == 16)
 350                 r4k_blast_icache_user_page = blast_icache16_user_page;
 351         else if (ic_lsize == 32)
 352                 r4k_blast_icache_user_page = blast_icache32_user_page;
 353         else if (ic_lsize == 64)
 354                 r4k_blast_icache_user_page = blast_icache64_user_page;
 355 }
 356
 357 #endif
 358
 359 static void (* r4k_blast_icache_page_indexed)(unsigned long addr);
 360
 361 static void r4k_blast_icache_page_indexed_setup(void)
 362 {
 363         unsigned long ic_lsize = cpu_icache_line_size();
 364
 365         if (ic_lsize == 0)
 366                 r4k_blast_icache_page_indexed = (void *)cache_noop;
 367         else if (ic_lsize == 16)
 368                 r4k_blast_icache_page_indexed = blast_icache16_page_indexed;
 369         else if (ic_lsize == 32) {
 370                 if (IS_ENABLED(CONFIG_WAR_R4600_V1_INDEX_ICACHEOP) &&
 371                     cpu_is_r4600_v1_x())
 372                         r4k_blast_icache_page_indexed =
 373                                 blast_icache32_r4600_v1_page_indexed;
 374                 else if (IS_ENABLED(CONFIG_WAR_TX49XX_ICACHE_INDEX_INV))
 375                         r4k_blast_icache_page_indexed =
 376                                 tx49_blast_icache32_page_indexed;
 377                 else if (current_cpu_type() == CPU_LOONGSON2EF)
 378                         r4k_blast_icache_page_indexed =
 379                                 loongson2_blast_icache32_page_indexed;
 380                 else
 381                         r4k_blast_icache_page_indexed =
 382                                 blast_icache32_page_indexed;
 383         } else if (ic_lsize == 64)
 384                 r4k_blast_icache_page_indexed = blast_icache64_page_indexed;
 385 }
 386
 387 void (* r4k_blast_icache)(void);
 388 EXPORT_SYMBOL(r4k_blast_icache);
 389
 390 static void r4k_blast_icache_setup(void)
 391 {
 392         unsigned long ic_lsize = cpu_icache_line_size();
 393
 394         if (ic_lsize == 0)
 395                 r4k_blast_icache = (void *)cache_noop;
 396         else if (ic_lsize == 16)
 397                 r4k_blast_icache = blast_icache16;
 398         else if (ic_lsize == 32) {
 399                 if (IS_ENABLED(CONFIG_WAR_R4600_V1_INDEX_ICACHEOP) &&
 400                     cpu_is_r4600_v1_x())
 401                         r4k_blast_icache = blast_r4600_v1_icache32;
 402                 else if (IS_ENABLED(CONFIG_WAR_TX49XX_ICACHE_INDEX_INV))
 403                         r4k_blast_icache = tx49_blast_icache32;
 404                 else if (current_cpu_type() == CPU_LOONGSON2EF)
 405                         r4k_blast_icache = loongson2_blast_icache32;
 406                 else
 407                         r4k_blast_icache = blast_icache32;
 408         } else if (ic_lsize == 64)
 409                 r4k_blast_icache = blast_icache64;
 410         else if (ic_lsize == 128)
 411                 r4k_blast_icache = blast_icache128;
 412 }
 413
 414 static void (* r4k_blast_scache_page)(unsigned long addr);
 415
 416 static void r4k_blast_scache_page_setup(void)
 417 {
 418         unsigned long sc_lsize = cpu_scache_line_size();
 419
 420         if (scache_size == 0)
 421                 r4k_blast_scache_page = (void *)cache_noop;
 422         else if (sc_lsize == 16)
 423                 r4k_blast_scache_page = blast_scache16_page;
 424         else if (sc_lsize == 32)
 425                 r4k_blast_scache_page = blast_scache32_page;
 426         else if (sc_lsize == 64)
 427                 r4k_blast_scache_page = blast_scache64_page;
 428         else if (sc_lsize == 128)
 429                 r4k_blast_scache_page = blast_scache128_page;
 430 }
 431
 432 static void (* r4k_blast_scache_page_indexed)(unsigned long addr);
 433
 434 static void r4k_blast_scache_page_indexed_setup(void)
 435 {
 436         unsigned long sc_lsize = cpu_scache_line_size();
 437
 438         if (scache_size == 0)
 439                 r4k_blast_scache_page_indexed = (void *)cache_noop;
 440         else if (sc_lsize == 16)
 441                 r4k_blast_scache_page_indexed = blast_scache16_page_indexed;
 442         else if (sc_lsize == 32)
 443                 r4k_blast_scache_page_indexed = blast_scache32_page_indexed;
 444         else if (sc_lsize == 64)
 445                 r4k_blast_scache_page_indexed = blast_scache64_page_indexed;
 446         else if (sc_lsize == 128)
 447                 r4k_blast_scache_page_indexed = blast_scache128_page_indexed;
 448 }
 449
 450 static void (* r4k_blast_scache)(void);
 451
 452 static void r4k_blast_scache_setup(void)
 453 {
 454         unsigned long sc_lsize = cpu_scache_line_size();
 455
 456         if (scache_size == 0)
 457                 r4k_blast_scache = (void *)cache_noop;
 458         else if (sc_lsize == 16)
 459                 r4k_blast_scache = blast_scache16;
 460         else if (sc_lsize == 32)
 461                 r4k_blast_scache = blast_scache32;
 462         else if (sc_lsize == 64)
 463                 r4k_blast_scache = blast_scache64;
 464         else if (sc_lsize == 128)
 465                 r4k_blast_scache = blast_scache128;
 466 }
 467
 468 static void (*r4k_blast_scache_node)(long node);
 469
 470 static void r4k_blast_scache_node_setup(void)
 471 {
 472         unsigned long sc_lsize = cpu_scache_line_size();
 473
 474         if (current_cpu_type() != CPU_LOONGSON64)
 475                 r4k_blast_scache_node = (void *)cache_noop;
 476         else if (sc_lsize == 16)
 477                 r4k_blast_scache_node = blast_scache16_node;
 478         else if (sc_lsize == 32)
 479                 r4k_blast_scache_node = blast_scache32_node;
 480         else if (sc_lsize == 64)
 481                 r4k_blast_scache_node = blast_scache64_node;
 482         else if (sc_lsize == 128)
 483                 r4k_blast_scache_node = blast_scache128_node;
 484 }
 485
 486 static inline void local_r4k___flush_cache_all(void * args)
 487 {
 488         switch (current_cpu_type()) {
 489         case CPU_LOONGSON2EF:
 490         case CPU_R4000SC:
 491         case CPU_R4000MC:
 492         case CPU_R4400SC:
 493         case CPU_R4400MC:
 494         case CPU_R10000:
 495         case CPU_R12000:
 496         case CPU_R14000:
 497         case CPU_R16000:
 498                 /*
 499                  * These caches are inclusive caches, that is, if something
 500                  * is not cached in the S-cache, we know it also won't be
 501                  * in one of the primary caches.
 502                  */
 503                 r4k_blast_scache();
 504                 break;
 505
 506         case CPU_LOONGSON64:
 507                 /* Use get_ebase_cpunum() for both NUMA=y/n */
 508                 r4k_blast_scache_node(get_ebase_cpunum() >> 2);
 509                 break;
 510
 511         case CPU_BMIPS5000:
 512                 r4k_blast_scache();
 513                 __sync();
 514                 break;
 515
 516         default:
 517                 r4k_blast_dcache();
 518                 r4k_blast_icache();
 519                 break;
 520         }
 521 }
 522
 523 static void r4k___flush_cache_all(void)
 524 {
 525         r4k_on_each_cpu(R4K_INDEX, local_r4k___flush_cache_all, NULL);
 526 }
 527
 528 /**
 529  * has_valid_asid() - Determine if an mm already has an ASID.
 530  * @mm:         Memory map.
 531  * @type:       R4K_HIT or R4K_INDEX, type of cache op.
 532  *
 533  * Determines whether @mm already has an ASID on any of the CPUs which cache ops
 534  * of type @type within an r4k_on_each_cpu() call will affect. If
 535  * r4k_on_each_cpu() does an SMP call to a single VPE in each core, then the
 536  * scope of the operation is confined to sibling CPUs, otherwise all online CPUs
 537  * will need to be checked.
 538  *
 539  * Must be called in non-preemptive context.
 540  *
 541  * Returns:     1 if the CPUs affected by @type cache ops have an ASID for @mm.
 542  *              0 otherwise.
 543  */
 544 static inline int has_valid_asid(const struct mm_struct *mm, unsigned int type)
 545 {
 546         unsigned int i;
 547         const cpumask_t *mask = cpu_present_mask;
 548
 549         if (cpu_has_mmid)
 550                 return cpu_context(0, mm) != 0;
 551
 552         /* cpu_sibling_map[] undeclared when !CONFIG_SMP */
 553 #ifdef CONFIG_SMP
 554         /*
 555          * If r4k_on_each_cpu does SMP calls, it does them to a single VPE in
 556          * each foreign core, so we only need to worry about siblings.
 557          * Otherwise we need to worry about all present CPUs.
 558          */
 559         if (r4k_op_needs_ipi(type))
 560                 mask = &cpu_sibling_map[smp_processor_id()];
 561 #endif
 562         for_each_cpu(i, mask)
 563                 if (cpu_context(i, mm))
 564                         return 1;
 565         return 0;
 566 }
 567
 568 static void r4k__flush_cache_vmap(void)
 569 {
 570         r4k_blast_dcache();
 571 }
 572
 573 static void r4k__flush_cache_vunmap(void)
 574 {
 575         r4k_blast_dcache();
 576 }
 577
 578 /*
 579  * Note: flush_tlb_range() assumes flush_cache_range() sufficiently flushes
 580  * whole caches when vma is executable.
 581  */
 582 static inline void local_r4k_flush_cache_range(void * args)
 583 {
 584         struct vm_area_struct *vma = args;
 585         int exec = vma->vm_flags & VM_EXEC;
 586
 587         if (!has_valid_asid(vma->vm_mm, R4K_INDEX))
 588                 return;
 589
 590         /*
 591          * If dcache can alias, we must blast it since mapping is changing.
 592          * If executable, we must ensure any dirty lines are written back far
 593          * enough to be visible to icache.
 594          */
 595         if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc))
 596                 r4k_blast_dcache();
 597         /* If executable, blast stale lines from icache */
 598         if (exec)
 599                 r4k_blast_icache();
 600 }
 601
 602 static void r4k_flush_cache_range(struct vm_area_struct *vma,
 603         unsigned long start, unsigned long end)
 604 {
 605         int exec = vma->vm_flags & VM_EXEC;
 606
 607         if (cpu_has_dc_aliases || exec)
 608                 r4k_on_each_cpu(R4K_INDEX, local_r4k_flush_cache_range, vma);
 609 }
 610
 611 static inline void local_r4k_flush_cache_mm(void * args)
 612 {
 613         struct mm_struct *mm = args;
 614
 615         if (!has_valid_asid(mm, R4K_INDEX))
 616                 return;
 617
 618         /*
 619          * Kludge alert.  For obscure reasons R4000SC and R4400SC go nuts if we
 620          * only flush the primary caches but R1x000 behave sane ...
 621          * R4000SC and R4400SC indexed S-cache ops also invalidate primary
 622          * caches, so we can bail out early.
 623          */
 624         if (current_cpu_type() == CPU_R4000SC ||
 625             current_cpu_type() == CPU_R4000MC ||
 626             current_cpu_type() == CPU_R4400SC ||
 627             current_cpu_type() == CPU_R4400MC) {
 628                 r4k_blast_scache();
 629                 return;
 630         }
 631
 632         r4k_blast_dcache();
 633 }
 634
 635 static void r4k_flush_cache_mm(struct mm_struct *mm)
 636 {
 637         if (!cpu_has_dc_aliases)
 638                 return;
 639
 640         r4k_on_each_cpu(R4K_INDEX, local_r4k_flush_cache_mm, mm);
 641 }
 642
 643 struct flush_cache_page_args {
 644         struct vm_area_struct *vma;
 645         unsigned long addr;
 646         unsigned long pfn;
 647 };
 648
 649 static inline void local_r4k_flush_cache_page(void *args)
 650 {
 651         struct flush_cache_page_args *fcp_args = args;
 652         struct vm_area_struct *vma = fcp_args->vma;
 653         unsigned long addr = fcp_args->addr;
 654         struct page *page = pfn_to_page(fcp_args->pfn);
 655         int exec = vma->vm_flags & VM_EXEC;
 656         struct mm_struct *mm = vma->vm_mm;
 657         int map_coherent = 0;
 658         pmd_t *pmdp;
 659         pte_t *ptep;
 660         void *vaddr;
 661
 662         /*
 663          * If owns no valid ASID yet, cannot possibly have gotten
 664          * this page into the cache.
 665          */
 666         if (!has_valid_asid(mm, R4K_HIT))
 667                 return;
 668
 669         addr &= PAGE_MASK;
 670         pmdp = pmd_off(mm, addr);
 671         ptep = pte_offset_kernel(pmdp, addr);
 672
 673         /*
 674          * If the page isn't marked valid, the page cannot possibly be
 675          * in the cache.
 676          */
 677         if (!(pte_present(*ptep)))
 678                 return;
 679
 680         if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID))
 681                 vaddr = NULL;
 682         else {
 683                 /*
 684                  * Use kmap_coherent or kmap_atomic to do flushes for
 685                  * another ASID than the current one.
 686                  */
 687                 map_coherent = (cpu_has_dc_aliases &&
 688                                 page_mapcount(page) &&
 689                                 !Page_dcache_dirty(page));
 690                 if (map_coherent)
 691                         vaddr = kmap_coherent(page, addr);
 692                 else
 693                         vaddr = kmap_atomic(page);
 694                 addr = (unsigned long)vaddr;
 695         }
 696
 697         if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
 698                 vaddr ? r4k_blast_dcache_page(addr) :
 699                         r4k_blast_dcache_user_page(addr);
 700                 if (exec && !cpu_icache_snoops_remote_store)
 701                         r4k_blast_scache_page(addr);
 702         }
 703         if (exec) {
 704                 if (vaddr && cpu_has_vtag_icache && mm == current->active_mm) {
 705                         drop_mmu_context(mm);
 706                 } else
 707                         vaddr ? r4k_blast_icache_page(addr) :
 708                                 r4k_blast_icache_user_page(addr);
 709         }
 710
 711         if (vaddr) {
 712                 if (map_coherent)
 713                         kunmap_coherent();
 714                 else
 715                         kunmap_atomic(vaddr);
 716         }
 717 }
 718
 719 static void r4k_flush_cache_page(struct vm_area_struct *vma,
 720         unsigned long addr, unsigned long pfn)
 721 {
 722         struct flush_cache_page_args args;
 723
 724         args.vma = vma;
 725         args.addr = addr;
 726         args.pfn = pfn;
 727
 728         r4k_on_each_cpu(R4K_HIT, local_r4k_flush_cache_page, &args);
 729 }
 730
 731 static inline void local_r4k_flush_data_cache_page(void * addr)
 732 {
 733         r4k_blast_dcache_page((unsigned long) addr);
 734 }
 735
 736 static void r4k_flush_data_cache_page(unsigned long addr)
 737 {
 738         if (in_atomic())
 739                 local_r4k_flush_data_cache_page((void *)addr);
 740         else
 741                 r4k_on_each_cpu(R4K_HIT, local_r4k_flush_data_cache_page,
 742                                 (void *) addr);
 743 }
 744
 745 struct flush_icache_range_args {
 746         unsigned long start;
 747         unsigned long end;
 748         unsigned int type;
 749         bool user;
 750 };
 751
 752 static inline void __local_r4k_flush_icache_range(unsigned long start,
 753                                                   unsigned long end,
 754                                                   unsigned int type,
 755                                                   bool user)
 756 {
 757         if (!cpu_has_ic_fills_f_dc) {
 758                 if (type == R4K_INDEX ||
 759                     (type & R4K_INDEX && end - start >= dcache_size)) {
 760                         r4k_blast_dcache();
 761                 } else {
 762                         R4600_HIT_CACHEOP_WAR_IMPL;
 763                         if (user)
 764                                 protected_blast_dcache_range(start, end);
 765                         else
 766                                 blast_dcache_range(start, end);
 767                 }
 768         }
 769
 770         if (type == R4K_INDEX ||
 771             (type & R4K_INDEX && end - start > icache_size))
 772                 r4k_blast_icache();
 773         else {
 774                 switch (boot_cpu_type()) {
 775                 case CPU_LOONGSON2EF:
 776                         protected_loongson2_blast_icache_range(start, end);
 777                         break;
 778
 779                 default:
 780                         if (user)
 781                                 protected_blast_icache_range(start, end);
 782                         else
 783                                 blast_icache_range(start, end);
 784                         break;
 785                 }
 786         }
 787 }
 788
 789 static inline void local_r4k_flush_icache_range(unsigned long start,
 790                                                 unsigned long end)
 791 {
 792         __local_r4k_flush_icache_range(start, end, R4K_HIT | R4K_INDEX, false);
 793 }
 794
 795 static inline void local_r4k_flush_icache_user_range(unsigned long start,
 796                                                      unsigned long end)
 797 {
 798         __local_r4k_flush_icache_range(start, end, R4K_HIT | R4K_INDEX, true);
 799 }
 800
 801 static inline void local_r4k_flush_icache_range_ipi(void *args)
 802 {
 803         struct flush_icache_range_args *fir_args = args;
 804         unsigned long start = fir_args->start;
 805         unsigned long end = fir_args->end;
 806         unsigned int type = fir_args->type;
 807         bool user = fir_args->user;
 808
 809         __local_r4k_flush_icache_range(start, end, type, user);
 810 }
 811
 812 static void __r4k_flush_icache_range(unsigned long start, unsigned long end,
 813                                      bool user)
 814 {
 815         struct flush_icache_range_args args;
 816         unsigned long size, cache_size;
 817
 818         args.start = start;
 819         args.end = end;
 820         args.type = R4K_HIT | R4K_INDEX;
 821         args.user = user;
 822
 823         /*
 824          * Indexed cache ops require an SMP call.
 825          * Consider if that can or should be avoided.
 826          */
 827         preempt_disable();
 828         if (r4k_op_needs_ipi(R4K_INDEX) && !r4k_op_needs_ipi(R4K_HIT)) {
 829                 /*
 830                  * If address-based cache ops don't require an SMP call, then
 831                  * use them exclusively for small flushes.
 832                  */
 833                 size = end - start;
 834                 cache_size = icache_size;
 835                 if (!cpu_has_ic_fills_f_dc) {
 836                         size *= 2;
 837                         cache_size += dcache_size;
 838                 }
 839                 if (size <= cache_size)
 840                         args.type &= ~R4K_INDEX;
 841         }
 842         r4k_on_each_cpu(args.type, local_r4k_flush_icache_range_ipi, &args);
 843         preempt_enable();
 844         instruction_hazard();
 845 }
 846
 847 static void r4k_flush_icache_range(unsigned long start, unsigned long end)
 848 {
 849         return __r4k_flush_icache_range(start, end, false);
 850 }
 851
 852 static void r4k_flush_icache_user_range(unsigned long start, unsigned long end)
 853 {
 854         return __r4k_flush_icache_range(start, end, true);
 855 }
 856
 857 #ifdef CONFIG_DMA_NONCOHERENT
 858
 859 static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
 860 {
 861         /* Catch bad driver code */
 862         if (WARN_ON(size == 0))
 863                 return;
 864
 865         preempt_disable();
 866         if (cpu_has_inclusive_pcaches) {
 867                 if (size >= scache_size) {
 868                         if (current_cpu_type() != CPU_LOONGSON64)
 869                                 r4k_blast_scache();
 870                         else
 871                                 r4k_blast_scache_node(pa_to_nid(addr));
 872                 } else {
 873                         blast_scache_range(addr, addr + size);
 874                 }
 875                 preempt_enable();
 876                 __sync();
 877                 return;
 878         }
 879
 880         /*
 881          * Either no secondary cache or the available caches don't have the
 882          * subset property so we have to flush the primary caches
 883          * explicitly.
 884          * If we would need IPI to perform an INDEX-type operation, then
 885          * we have to use the HIT-type alternative as IPI cannot be used
 886          * here due to interrupts possibly being disabled.
 887          */
 888         if (!r4k_op_needs_ipi(R4K_INDEX) && size >= dcache_size) {
 889                 r4k_blast_dcache();
 890         } else {
 891                 R4600_HIT_CACHEOP_WAR_IMPL;
 892                 blast_dcache_range(addr, addr + size);
 893         }
 894         preempt_enable();
 895
 896         bc_wback_inv(addr, size);
 897         __sync();
 898 }
 899
 900 static void prefetch_cache_inv(unsigned long addr, unsigned long size)
 901 {
 902         unsigned int linesz = cpu_scache_line_size();
 903         unsigned long addr0 = addr, addr1;
 904
 905         addr0 &= ~(linesz - 1);
 906         addr1 = (addr0 + size - 1) & ~(linesz - 1);
 907
 908         protected_writeback_scache_line(addr0);
 909         if (likely(addr1 != addr0))
 910                 protected_writeback_scache_line(addr1);
 911         else
 912                 return;
 913
 914         addr0 += linesz;
 915         if (likely(addr1 != addr0))
 916                 protected_writeback_scache_line(addr0);
 917         else
 918                 return;
 919
 920         addr1 -= linesz;
 921         if (likely(addr1 > addr0))
 922                 protected_writeback_scache_line(addr0);
 923 }
 924
 925 static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
 926 {
 927         /* Catch bad driver code */
 928         if (WARN_ON(size == 0))
 929                 return;
 930
 931         preempt_disable();
 932
 933         if (current_cpu_type() == CPU_BMIPS5000)
 934                 prefetch_cache_inv(addr, size);
 935
 936         if (cpu_has_inclusive_pcaches) {
 937                 if (size >= scache_size) {
 938                         if (current_cpu_type() != CPU_LOONGSON64)
 939                                 r4k_blast_scache();
 940                         else
 941                                 r4k_blast_scache_node(pa_to_nid(addr));
 942                 } else {
 943                         /*
 944                          * There is no clearly documented alignment requirement
 945                          * for the cache instruction on MIPS processors and
 946                          * some processors, among them the RM5200 and RM7000
 947                          * QED processors will throw an address error for cache
 948                          * hit ops with insufficient alignment.  Solved by
 949                          * aligning the address to cache line size.
 950                          */
 951                         blast_inv_scache_range(addr, addr + size);
 952                 }
 953                 preempt_enable();
 954                 __sync();
 955                 return;
 956         }
 957
 958         if (!r4k_op_needs_ipi(R4K_INDEX) && size >= dcache_size) {
 959                 r4k_blast_dcache();
 960         } else {
 961                 R4600_HIT_CACHEOP_WAR_IMPL;
 962                 blast_inv_dcache_range(addr, addr + size);
 963         }
 964         preempt_enable();
 965
 966         bc_inv(addr, size);
 967         __sync();
 968 }
 969 #endif /* CONFIG_DMA_NONCOHERENT */
 970
 971 static void r4k_flush_icache_all(void)
 972 {
 973         if (cpu_has_vtag_icache)
 974                 r4k_blast_icache();
 975 }
 976
 977 struct flush_kernel_vmap_range_args {
 978         unsigned long   vaddr;
 979         int             size;
 980 };
 981
 982 static inline void local_r4k_flush_kernel_vmap_range_index(void *args)
 983 {
 984         /*
 985          * Aliases only affect the primary caches so don't bother with
 986          * S-caches or T-caches.
 987          */
 988         r4k_blast_dcache();
 989 }
 990
 991 static inline void local_r4k_flush_kernel_vmap_range(void *args)
 992 {
 993         struct flush_kernel_vmap_range_args *vmra = args;
 994         unsigned long vaddr = vmra->vaddr;
 995         int size = vmra->size;
 996
 997         /*
 998          * Aliases only affect the primary caches so don't bother with
 999          * S-caches or T-caches.
1000          */
1001         R4600_HIT_CACHEOP_WAR_IMPL;
1002         blast_dcache_range(vaddr, vaddr + size);
1003 }
1004
1005 static void r4k_flush_kernel_vmap_range(unsigned long vaddr, int size)
1006 {
1007         struct flush_kernel_vmap_range_args args;
1008
1009         args.vaddr = (unsigned long) vaddr;
1010         args.size = size;
1011
1012         if (size >= dcache_size)
1013                 r4k_on_each_cpu(R4K_INDEX,
1014                                 local_r4k_flush_kernel_vmap_range_index, NULL);
1015         else
1016                 r4k_on_each_cpu(R4K_HIT, local_r4k_flush_kernel_vmap_range,
1017                                 &args);
1018 }
1019
1020 static inline void rm7k_erratum31(void)
1021 {
1022         const unsigned long ic_lsize = 32;
1023         unsigned long addr;
1024
1025         /* RM7000 erratum #31. The icache is screwed at startup. */
1026         write_c0_taglo(0);
1027         write_c0_taghi(0);
1028
1029         for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) {
1030                 __asm__ __volatile__ (
1031                         ".set push\n\t"
1032                         ".set noreorder\n\t"
1033                         ".set mips3\n\t"
1034                         "cache\t%1, 0(%0)\n\t"
1035                         "cache\t%1, 0x1000(%0)\n\t"
1036                         "cache\t%1, 0x2000(%0)\n\t"
1037                         "cache\t%1, 0x3000(%0)\n\t"
1038                         "cache\t%2, 0(%0)\n\t"
1039                         "cache\t%2, 0x1000(%0)\n\t"
1040                         "cache\t%2, 0x2000(%0)\n\t"
1041                         "cache\t%2, 0x3000(%0)\n\t"
1042                         "cache\t%1, 0(%0)\n\t"
1043                         "cache\t%1, 0x1000(%0)\n\t"
1044                         "cache\t%1, 0x2000(%0)\n\t"
1045                         "cache\t%1, 0x3000(%0)\n\t"
1046                         ".set pop\n"
1047                         :
1048                         : "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill_I));
1049         }
1050 }
1051
1052 static inline int alias_74k_erratum(struct cpuinfo_mips *c)
1053 {
1054         unsigned int imp = c->processor_id & PRID_IMP_MASK;
1055         unsigned int rev = c->processor_id & PRID_REV_MASK;
1056         int present = 0;
1057
1058         /*
1059          * Early versions of the 74K do not update the cache tags on a
1060          * vtag miss/ptag hit which can occur in the case of KSEG0/KUSEG
1061          * aliases.  In this case it is better to treat the cache as always
1062          * having aliases.  Also disable the synonym tag update feature
1063          * where available.  In this case no opportunistic tag update will
1064          * happen where a load causes a virtual address miss but a physical
1065          * address hit during a D-cache look-up.
1066          */
1067         switch (imp) {
1068         case PRID_IMP_74K:
1069                 if (rev <= PRID_REV_ENCODE_332(2, 4, 0))
1070                         present = 1;
1071                 if (rev == PRID_REV_ENCODE_332(2, 4, 0))
1072                         write_c0_config6(read_c0_config6() | MTI_CONF6_SYND);
1073                 break;
1074         case PRID_IMP_1074K:
1075                 if (rev <= PRID_REV_ENCODE_332(1, 1, 0)) {
1076                         present = 1;
1077                         write_c0_config6(read_c0_config6() | MTI_CONF6_SYND);
1078                 }
1079                 break;
1080         default:
1081                 BUG();
1082         }
1083
1084         return present;
1085 }
1086
1087 static void b5k_instruction_hazard(void)
1088 {
1089         __sync();
1090         __sync();
1091         __asm__ __volatile__(
1092         "       nop; nop; nop; nop; nop; nop; nop; nop\n"
1093         "       nop; nop; nop; nop; nop; nop; nop; nop\n"
1094         "       nop; nop; nop; nop; nop; nop; nop; nop\n"
1095         "       nop; nop; nop; nop; nop; nop; nop; nop\n"
1096         : : : "memory");
1097 }
1098
1099 static char *way_string[] = { NULL, "direct mapped", "2-way",
1100         "3-way", "4-way", "5-way", "6-way", "7-way", "8-way",
1101         "9-way", "10-way", "11-way", "12-way",
1102         "13-way", "14-way", "15-way", "16-way",
1103 };
1104
1105 static void probe_pcache(void)
1106 {
1107         struct cpuinfo_mips *c = &current_cpu_data;
1108         unsigned int config = read_c0_config();
1109         unsigned int prid = read_c0_prid();
1110         int has_74k_erratum = 0;
1111         unsigned long config1;
1112         unsigned int lsize;
1113
1114         switch (current_cpu_type()) {
1115         case CPU_R4600:                 /* QED style two way caches? */
1116         case CPU_R4700:
1117         case CPU_R5000:
1118         case CPU_NEVADA:
1119                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
1120                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1121                 c->icache.ways = 2;
1122                 c->icache.waybit = __ffs(icache_size/2);
1123
1124                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
1125                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1126                 c->dcache.ways = 2;
1127                 c->dcache.waybit= __ffs(dcache_size/2);
1128
1129                 c->options |= MIPS_CPU_CACHE_CDEX_P;
1130                 break;
1131
1132         case CPU_R5500:
1133                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
1134                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1135                 c->icache.ways = 2;
1136                 c->icache.waybit= 0;
1137
1138                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
1139                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1140                 c->dcache.ways = 2;
1141                 c->dcache.waybit = 0;
1142
1143                 c->options |= MIPS_CPU_CACHE_CDEX_P | MIPS_CPU_PREFETCH;
1144                 break;
1145
1146         case CPU_TX49XX:
1147                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
1148                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1149                 c->icache.ways = 4;
1150                 c->icache.waybit= 0;
1151
1152                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
1153                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1154                 c->dcache.ways = 4;
1155                 c->dcache.waybit = 0;
1156
1157                 c->options |= MIPS_CPU_CACHE_CDEX_P;
1158                 c->options |= MIPS_CPU_PREFETCH;
1159                 break;
1160
1161         case CPU_R4000PC:
1162         case CPU_R4000SC:
1163         case CPU_R4000MC:
1164         case CPU_R4400PC:
1165         case CPU_R4400SC:
1166         case CPU_R4400MC:
1167                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
1168                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1169                 c->icache.ways = 1;
1170                 c->icache.waybit = 0;   /* doesn't matter */
1171
1172                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
1173                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1174                 c->dcache.ways = 1;
1175                 c->dcache.waybit = 0;   /* does not matter */
1176
1177                 c->options |= MIPS_CPU_CACHE_CDEX_P;
1178                 break;
1179
1180         case CPU_R10000:
1181         case CPU_R12000:
1182         case CPU_R14000:
1183         case CPU_R16000:
1184                 icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29));
1185                 c->icache.linesz = 64;
1186                 c->icache.ways = 2;
1187                 c->icache.waybit = 0;
1188
1189                 dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26));
1190                 c->dcache.linesz = 32;
1191                 c->dcache.ways = 2;
1192                 c->dcache.waybit = 0;
1193
1194                 c->options |= MIPS_CPU_PREFETCH;
1195                 break;
1196
1197         case CPU_VR4133:
1198                 write_c0_config(config & ~VR41_CONF_P4K);
1199                 fallthrough;
1200         case CPU_VR4131:
1201                 /* Workaround for cache instruction bug of VR4131 */
1202                 if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U ||
1203                     c->processor_id == 0x0c82U) {
1204                         config |= 0x00400000U;
1205                         if (c->processor_id == 0x0c80U)
1206                                 config |= VR41_CONF_BP;
1207                         write_c0_config(config);
1208                 } else
1209                         c->options |= MIPS_CPU_CACHE_CDEX_P;
1210
1211                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
1212                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1213                 c->icache.ways = 2;
1214                 c->icache.waybit = __ffs(icache_size/2);
1215
1216                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
1217                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1218                 c->dcache.ways = 2;
1219                 c->dcache.waybit = __ffs(dcache_size/2);
1220                 break;
1221
1222         case CPU_VR41XX:
1223         case CPU_VR4111:
1224         case CPU_VR4121:
1225         case CPU_VR4122:
1226         case CPU_VR4181:
1227         case CPU_VR4181A:
1228                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
1229                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1230                 c->icache.ways = 1;
1231                 c->icache.waybit = 0;   /* doesn't matter */
1232
1233                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
1234                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1235                 c->dcache.ways = 1;
1236                 c->dcache.waybit = 0;   /* does not matter */
1237
1238                 c->options |= MIPS_CPU_CACHE_CDEX_P;
1239                 break;
1240
1241         case CPU_RM7000:
1242                 rm7k_erratum31();
1243
1244                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
1245                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1246                 c->icache.ways = 4;
1247                 c->icache.waybit = __ffs(icache_size / c->icache.ways);
1248
1249                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
1250                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1251                 c->dcache.ways = 4;
1252                 c->dcache.waybit = __ffs(dcache_size / c->dcache.ways);
1253
1254                 c->options |= MIPS_CPU_CACHE_CDEX_P;
1255                 c->options |= MIPS_CPU_PREFETCH;
1256                 break;
1257
1258         case CPU_LOONGSON2EF:
1259                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
1260                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1261                 if (prid & 0x3)
1262                         c->icache.ways = 4;
1263                 else
1264                         c->icache.ways = 2;
1265                 c->icache.waybit = 0;
1266
1267                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
1268                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1269                 if (prid & 0x3)
1270                         c->dcache.ways = 4;
1271                 else
1272                         c->dcache.ways = 2;
1273                 c->dcache.waybit = 0;
1274                 break;
1275
1276         case CPU_LOONGSON64:
1277                 config1 = read_c0_config1();
1278                 lsize = (config1 >> 19) & 7;
1279                 if (lsize)
1280                         c->icache.linesz = 2 << lsize;
1281                 else
1282                         c->icache.linesz = 0;
1283                 c->icache.sets = 64 << ((config1 >> 22) & 7);
1284                 c->icache.ways = 1 + ((config1 >> 16) & 7);
1285                 icache_size = c->icache.sets *
1286                                           c->icache.ways *
1287                                           c->icache.linesz;
1288                 c->icache.waybit = 0;
1289
1290                 lsize = (config1 >> 10) & 7;
1291                 if (lsize)
1292                         c->dcache.linesz = 2 << lsize;
1293                 else
1294                         c->dcache.linesz = 0;
1295                 c->dcache.sets = 64 << ((config1 >> 13) & 7);
1296                 c->dcache.ways = 1 + ((config1 >> 7) & 7);
1297                 dcache_size = c->dcache.sets *
1298                                           c->dcache.ways *
1299                                           c->dcache.linesz;
1300                 c->dcache.waybit = 0;
1301                 if ((c->processor_id & (PRID_IMP_MASK | PRID_REV_MASK)) >=
1302                                 (PRID_IMP_LOONGSON_64C | PRID_REV_LOONGSON3A_R2_0) ||
1303                                 (c->processor_id & PRID_IMP_MASK) == PRID_IMP_LOONGSON_64R)
1304                         c->options |= MIPS_CPU_PREFETCH;
1305                 break;
1306
1307         case CPU_CAVIUM_OCTEON3:
1308                 /* For now lie about the number of ways. */
1309                 c->icache.linesz = 128;
1310                 c->icache.sets = 16;
1311                 c->icache.ways = 8;
1312                 c->icache.flags |= MIPS_CACHE_VTAG;
1313                 icache_size = c->icache.sets * c->icache.ways * c->icache.linesz;
1314
1315                 c->dcache.linesz = 128;
1316                 c->dcache.ways = 8;
1317                 c->dcache.sets = 8;
1318                 dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz;
1319                 c->options |= MIPS_CPU_PREFETCH;
1320                 break;
1321
1322         default:
1323                 if (!(config & MIPS_CONF_M))
1324                         panic("Don't know how to probe P-caches on this cpu.");
1325
1326                 /*
1327                  * So we seem to be a MIPS32 or MIPS64 CPU
1328                  * So let's probe the I-cache ...
1329                  */
1330                 config1 = read_c0_config1();
1331
1332                 lsize = (config1 >> 19) & 7;
1333
1334                 /* IL == 7 is reserved */
1335                 if (lsize == 7)
1336                         panic("Invalid icache line size");
1337
1338                 c->icache.linesz = lsize ? 2 << lsize : 0;
1339
1340                 c->icache.sets = 32 << (((config1 >> 22) + 1) & 7);
1341                 c->icache.ways = 1 + ((config1 >> 16) & 7);
1342
1343                 icache_size = c->icache.sets *
1344                               c->icache.ways *
1345                               c->icache.linesz;
1346                 c->icache.waybit = __ffs(icache_size/c->icache.ways);
1347
1348                 if (config & MIPS_CONF_VI)
1349                         c->icache.flags |= MIPS_CACHE_VTAG;
1350
1351                 /*
1352                  * Now probe the MIPS32 / MIPS64 data cache.
1353                  */
1354                 c->dcache.flags = 0;
1355
1356                 lsize = (config1 >> 10) & 7;
1357
1358                 /* DL == 7 is reserved */
1359                 if (lsize == 7)
1360                         panic("Invalid dcache line size");
1361
1362                 c->dcache.linesz = lsize ? 2 << lsize : 0;
1363
1364                 c->dcache.sets = 32 << (((config1 >> 13) + 1) & 7);
1365                 c->dcache.ways = 1 + ((config1 >> 7) & 7);
1366
1367                 dcache_size = c->dcache.sets *
1368                               c->dcache.ways *
1369                               c->dcache.linesz;
1370                 c->dcache.waybit = __ffs(dcache_size/c->dcache.ways);
1371
1372                 c->options |= MIPS_CPU_PREFETCH;
1373                 break;
1374         }
1375
1376         /*
1377          * Processor configuration sanity check for the R4000SC erratum
1378          * #5.  With page sizes larger than 32kB there is no possibility
1379          * to get a VCE exception anymore so we don't care about this
1380          * misconfiguration.  The case is rather theoretical anyway;
1381          * presumably no vendor is shipping his hardware in the "bad"
1382          * configuration.
1383          */
1384         if ((prid & PRID_IMP_MASK) == PRID_IMP_R4000 &&
1385             (prid & PRID_REV_MASK) < PRID_REV_R4400 &&
1386             !(config & CONF_SC) && c->icache.linesz != 16 &&
1387             PAGE_SIZE <= 0x8000)
1388                 panic("Improper R4000SC processor configuration detected");
1389
1390         /* compute a couple of other cache variables */
1391         c->icache.waysize = icache_size / c->icache.ways;
1392         c->dcache.waysize = dcache_size / c->dcache.ways;
1393
1394         c->icache.sets = c->icache.linesz ?
1395                 icache_size / (c->icache.linesz * c->icache.ways) : 0;
1396         c->dcache.sets = c->dcache.linesz ?
1397                 dcache_size / (c->dcache.linesz * c->dcache.ways) : 0;
1398
1399         /*
1400          * R1x000 P-caches are odd in a positive way.  They're 32kB 2-way
1401          * virtually indexed so normally would suffer from aliases.  So
1402          * normally they'd suffer from aliases but magic in the hardware deals
1403          * with that for us so we don't need to take care ourselves.
1404          */
1405         switch (current_cpu_type()) {
1406         case CPU_20KC:
1407         case CPU_25KF:
1408         case CPU_I6400:
1409         case CPU_I6500:
1410         case CPU_SB1:
1411         case CPU_SB1A:
1412         case CPU_XLR:
1413                 c->dcache.flags |= MIPS_CACHE_PINDEX;
1414                 break;
1415
1416         case CPU_R10000:
1417         case CPU_R12000:
1418         case CPU_R14000:
1419         case CPU_R16000:
1420                 break;
1421
1422         case CPU_74K:
1423         case CPU_1074K:
1424                 has_74k_erratum = alias_74k_erratum(c);
1425                 fallthrough;
1426         case CPU_M14KC:
1427         case CPU_M14KEC:
1428         case CPU_24K:
1429         case CPU_34K:
1430         case CPU_1004K:
1431         case CPU_INTERAPTIV:
1432         case CPU_P5600:
1433         case CPU_PROAPTIV:
1434         case CPU_M5150:
1435         case CPU_QEMU_GENERIC:
1436         case CPU_P6600:
1437         case CPU_M6250:
1438                 if (!(read_c0_config7() & MIPS_CONF7_IAR) &&
1439                     (c->icache.waysize > PAGE_SIZE))
1440                         c->icache.flags |= MIPS_CACHE_ALIASES;
1441                 if (!has_74k_erratum && (read_c0_config7() & MIPS_CONF7_AR)) {
1442                         /*
1443                          * Effectively physically indexed dcache,
1444                          * thus no virtual aliases.
1445                         */
1446                         c->dcache.flags |= MIPS_CACHE_PINDEX;
1447                         break;
1448                 }
1449                 fallthrough;
1450         default:
1451                 if (has_74k_erratum || c->dcache.waysize > PAGE_SIZE)
1452                         c->dcache.flags |= MIPS_CACHE_ALIASES;
1453         }
1454
1455         /* Physically indexed caches don't suffer from virtual aliasing */
1456         if (c->dcache.flags & MIPS_CACHE_PINDEX)
1457                 c->dcache.flags &= ~MIPS_CACHE_ALIASES;
1458
1459         /*
1460          * In systems with CM the icache fills from L2 or closer caches, and
1461          * thus sees remote stores without needing to write them back any
1462          * further than that.
1463          */
1464         if (mips_cm_present())
1465                 c->icache.flags |= MIPS_IC_SNOOPS_REMOTE;
1466
1467         switch (current_cpu_type()) {
1468         case CPU_20KC:
1469                 /*
1470                  * Some older 20Kc chips doesn't have the 'VI' bit in
1471                  * the config register.
1472                  */
1473                 c->icache.flags |= MIPS_CACHE_VTAG;
1474                 break;
1475
1476         case CPU_ALCHEMY:
1477         case CPU_I6400:
1478         case CPU_I6500:
1479                 c->icache.flags |= MIPS_CACHE_IC_F_DC;
1480                 break;
1481
1482         case CPU_BMIPS5000:
1483                 c->icache.flags |= MIPS_CACHE_IC_F_DC;
1484                 /* Cache aliases are handled in hardware; allow HIGHMEM */
1485                 c->dcache.flags &= ~MIPS_CACHE_ALIASES;
1486                 break;
1487
1488         case CPU_LOONGSON2EF:
1489                 /*
1490                  * LOONGSON2 has 4 way icache, but when using indexed cache op,
1491                  * one op will act on all 4 ways
1492                  */
1493                 c->icache.ways = 1;
1494         }
1495
1496         pr_info("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
1497                 icache_size >> 10,
1498                 c->icache.flags & MIPS_CACHE_VTAG ? "VIVT" : "VIPT",
1499                 way_string[c->icache.ways], c->icache.linesz);
1500
1501         pr_info("Primary data cache %ldkB, %s, %s, %s, linesize %d bytes\n",
1502                 dcache_size >> 10, way_string[c->dcache.ways],
1503                 (c->dcache.flags & MIPS_CACHE_PINDEX) ? "PIPT" : "VIPT",
1504                 (c->dcache.flags & MIPS_CACHE_ALIASES) ?
1505                         "cache aliases" : "no aliases",
1506                 c->dcache.linesz);
1507 }
1508
1509 static void probe_vcache(void)
1510 {
1511         struct cpuinfo_mips *c = &current_cpu_data;
1512         unsigned int config2, lsize;
1513
1514         if (current_cpu_type() != CPU_LOONGSON64)
1515                 return;
1516
1517         config2 = read_c0_config2();
1518         if ((lsize = ((config2 >> 20) & 15)))
1519                 c->vcache.linesz = 2 << lsize;
1520         else
1521                 c->vcache.linesz = lsize;
1522
1523         c->vcache.sets = 64 << ((config2 >> 24) & 15);
1524         c->vcache.ways = 1 + ((config2 >> 16) & 15);
1525
1526         vcache_size = c->vcache.sets * c->vcache.ways * c->vcache.linesz;
1527
1528         c->vcache.waybit = 0;
1529         c->vcache.waysize = vcache_size / c->vcache.ways;
1530
1531         pr_info("Unified victim cache %ldkB %s, linesize %d bytes.\n",
1532                 vcache_size >> 10, way_string[c->vcache.ways], c->vcache.linesz);
1533 }
1534
1535 /*
1536  * If you even _breathe_ on this function, look at the gcc output and make sure
1537  * it does not pop things on and off the stack for the cache sizing loop that
1538  * executes in KSEG1 space or else you will crash and burn badly.  You have
1539  * been warned.
1540  */
1541 static int probe_scache(void)
1542 {
1543         unsigned long flags, addr, begin, end, pow2;
1544         unsigned int config = read_c0_config();
1545         struct cpuinfo_mips *c = &current_cpu_data;
1546
1547         if (config & CONF_SC)
1548                 return 0;
1549
1550         begin = (unsigned long) &_stext;
1551         begin &= ~((4 * 1024 * 1024) - 1);
1552         end = begin + (4 * 1024 * 1024);
1553
1554         /*
1555          * This is such a bitch, you'd think they would make it easy to do
1556          * this.  Away you daemons of stupidity!
1557          */
1558         local_irq_save(flags);
1559
1560         /* Fill each size-multiple cache line with a valid tag. */
1561         pow2 = (64 * 1024);
1562         for (addr = begin; addr < end; addr = (begin + pow2)) {
1563                 unsigned long *p = (unsigned long *) addr;
1564                 __asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
1565                 pow2 <<= 1;
1566         }
1567
1568         /* Load first line with zero (therefore invalid) tag. */
1569         write_c0_taglo(0);
1570         write_c0_taghi(0);
1571         __asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
1572         cache_op(Index_Store_Tag_I, begin);
1573         cache_op(Index_Store_Tag_D, begin);
1574         cache_op(Index_Store_Tag_SD, begin);
1575
1576         /* Now search for the wrap around point. */
1577         pow2 = (128 * 1024);
1578         for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) {
1579                 cache_op(Index_Load_Tag_SD, addr);
1580                 __asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
1581                 if (!read_c0_taglo())
1582                         break;
1583                 pow2 <<= 1;
1584         }
1585         local_irq_restore(flags);
1586         addr -= begin;
1587
1588         scache_size = addr;
1589         c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22);
1590         c->scache.ways = 1;
1591         c->scache.waybit = 0;           /* does not matter */
1592
1593         return 1;
1594 }
1595
1596 static void __init loongson2_sc_init(void)
1597 {
1598         struct cpuinfo_mips *c = &current_cpu_data;
1599
1600         scache_size = 512*1024;
1601         c->scache.linesz = 32;
1602         c->scache.ways = 4;
1603         c->scache.waybit = 0;
1604         c->scache.waysize = scache_size / (c->scache.ways);
1605         c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1606         pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1607                scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1608
1609         c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1610 }
1611
1612 static void __init loongson3_sc_init(void)
1613 {
1614         struct cpuinfo_mips *c = &current_cpu_data;
1615         unsigned int config2, lsize;
1616
1617         config2 = read_c0_config2();
1618         lsize = (config2 >> 4) & 15;
1619         if (lsize)
1620                 c->scache.linesz = 2 << lsize;
1621         else
1622                 c->scache.linesz = 0;
1623         c->scache.sets = 64 << ((config2 >> 8) & 15);
1624         c->scache.ways = 1 + (config2 & 15);
1625
1626         scache_size = c->scache.sets *
1627                                   c->scache.ways *
1628                                   c->scache.linesz;
1629
1630         /* Loongson-3 has 4-Scache banks, while Loongson-2K have only 2 banks */
1631         if ((c->processor_id & PRID_IMP_MASK) == PRID_IMP_LOONGSON_64R)
1632                 scache_size *= 2;
1633         else
1634                 scache_size *= 4;
1635
1636         c->scache.waybit = 0;
1637         c->scache.waysize = scache_size / c->scache.ways;
1638         pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1639                scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1640         if (scache_size)
1641                 c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1642         return;
1643 }
1644
1645 extern int r5k_sc_init(void);
1646 extern int rm7k_sc_init(void);
1647 extern int mips_sc_init(void);
1648
1649 static void setup_scache(void)
1650 {
1651         struct cpuinfo_mips *c = &current_cpu_data;
1652         unsigned int config = read_c0_config();
1653         int sc_present = 0;
1654
1655         /*
1656          * Do the probing thing on R4000SC and R4400SC processors.  Other
1657          * processors don't have a S-cache that would be relevant to the
1658          * Linux memory management.
1659          */
1660         switch (current_cpu_type()) {
1661         case CPU_R4000SC:
1662         case CPU_R4000MC:
1663         case CPU_R4400SC:
1664         case CPU_R4400MC:
1665                 sc_present = run_uncached(probe_scache);
1666                 if (sc_present)
1667                         c->options |= MIPS_CPU_CACHE_CDEX_S;
1668                 break;
1669
1670         case CPU_R10000:
1671         case CPU_R12000:
1672         case CPU_R14000:
1673         case CPU_R16000:
1674                 scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16);
1675                 c->scache.linesz = 64 << ((config >> 13) & 1);
1676                 c->scache.ways = 2;
1677                 c->scache.waybit= 0;
1678                 sc_present = 1;
1679                 break;
1680
1681         case CPU_R5000:
1682         case CPU_NEVADA:
1683 #ifdef CONFIG_R5000_CPU_SCACHE
1684                 r5k_sc_init();
1685 #endif
1686                 return;
1687
1688         case CPU_RM7000:
1689 #ifdef CONFIG_RM7000_CPU_SCACHE
1690                 rm7k_sc_init();
1691 #endif
1692                 return;
1693
1694         case CPU_LOONGSON2EF:
1695                 loongson2_sc_init();
1696                 return;
1697
1698         case CPU_LOONGSON64:
1699                 loongson3_sc_init();
1700                 return;
1701
1702         case CPU_CAVIUM_OCTEON3:
1703         case CPU_XLP:
1704                 /* don't need to worry about L2, fully coherent */
1705                 return;
1706
1707         default:
1708                 if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1 |
1709                                     MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2 |
1710                                     MIPS_CPU_ISA_M32R5 | MIPS_CPU_ISA_M64R5 |
1711                                     MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6)) {
1712 #ifdef CONFIG_MIPS_CPU_SCACHE
1713                         if (mips_sc_init ()) {
1714                                 scache_size = c->scache.ways * c->scache.sets * c->scache.linesz;
1715                                 printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n",
1716                                        scache_size >> 10,
1717                                        way_string[c->scache.ways], c->scache.linesz);
1718
1719                                 if (current_cpu_type() == CPU_BMIPS5000)
1720                                         c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1721                         }
1722
1723 #else
1724                         if (!(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
1725                                 panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
1726 #endif
1727                         return;
1728                 }
1729                 sc_present = 0;
1730         }
1731
1732         if (!sc_present)
1733                 return;
1734
1735         /* compute a couple of other cache variables */
1736         c->scache.waysize = scache_size / c->scache.ways;
1737
1738         c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1739
1740         printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1741                scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1742
1743         c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1744 }
1745
1746 void au1x00_fixup_config_od(void)
1747 {
1748         /*
1749          * c0_config.od (bit 19) was write only (and read as 0)
1750          * on the early revisions of Alchemy SOCs.  It disables the bus
1751          * transaction overlapping and needs to be set to fix various errata.
1752          */
1753         switch (read_c0_prid()) {
1754         case 0x00030100: /* Au1000 DA */
1755         case 0x00030201: /* Au1000 HA */
1756         case 0x00030202: /* Au1000 HB */
1757         case 0x01030200: /* Au1500 AB */
1758         /*
1759          * Au1100 errata actually keeps silence about this bit, so we set it
1760          * just in case for those revisions that require it to be set according
1761          * to the (now gone) cpu table.
1762          */
1763         case 0x02030200: /* Au1100 AB */
1764         case 0x02030201: /* Au1100 BA */
1765         case 0x02030202: /* Au1100 BC */
1766                 set_c0_config(1 << 19);
1767                 break;
1768         }
1769 }
1770
1771 /* CP0 hazard avoidance. */
1772 #define NXP_BARRIER()                                                   \
1773          __asm__ __volatile__(                                          \
1774         ".set noreorder\n\t"                                            \
1775         "nop; nop; nop; nop; nop; nop;\n\t"                             \
1776         ".set reorder\n\t")
1777
1778 static void nxp_pr4450_fixup_config(void)
1779 {
1780         unsigned long config0;
1781
1782         config0 = read_c0_config();
1783
1784         /* clear all three cache coherency fields */
1785         config0 &= ~(0x7 | (7 << 25) | (7 << 28));
1786         config0 |= (((_page_cachable_default >> _CACHE_SHIFT) <<  0) |
1787                     ((_page_cachable_default >> _CACHE_SHIFT) << 25) |
1788                     ((_page_cachable_default >> _CACHE_SHIFT) << 28));
1789         write_c0_config(config0);
1790         NXP_BARRIER();
1791 }
1792
1793 static int cca = -1;
1794
1795 static int __init cca_setup(char *str)
1796 {
1797         get_option(&str, &cca);
1798
1799         return 0;
1800 }
1801
1802 early_param("cca", cca_setup);
1803
1804 static void coherency_setup(void)
1805 {
1806         if (cca < 0 || cca > 7)
1807                 cca = read_c0_config() & CONF_CM_CMASK;
1808         _page_cachable_default = cca << _CACHE_SHIFT;
1809
1810         pr_debug("Using cache attribute %d\n", cca);
1811         change_c0_config(CONF_CM_CMASK, cca);
1812
1813         /*
1814          * c0_status.cu=0 specifies that updates by the sc instruction use
1815          * the coherency mode specified by the TLB; 1 means cachable
1816          * coherent update on write will be used.  Not all processors have
1817          * this bit and; some wire it to zero, others like Toshiba had the
1818          * silly idea of putting something else there ...
1819          */
1820         switch (current_cpu_type()) {
1821         case CPU_R4000PC:
1822         case CPU_R4000SC:
1823         case CPU_R4000MC:
1824         case CPU_R4400PC:
1825         case CPU_R4400SC:
1826         case CPU_R4400MC:
1827                 clear_c0_config(CONF_CU);
1828                 break;
1829         /*
1830          * We need to catch the early Alchemy SOCs with
1831          * the write-only co_config.od bit and set it back to one on:
1832          * Au1000 rev DA, HA, HB;  Au1100 AB, BA, BC, Au1500 AB
1833          */
1834         case CPU_ALCHEMY:
1835                 au1x00_fixup_config_od();
1836                 break;
1837
1838         case PRID_IMP_PR4450:
1839                 nxp_pr4450_fixup_config();
1840                 break;
1841         }
1842 }
1843
1844 static void r4k_cache_error_setup(void)
1845 {
1846         extern char __weak except_vec2_generic;
1847         extern char __weak except_vec2_sb1;
1848
1849         switch (current_cpu_type()) {
1850         case CPU_SB1:
1851         case CPU_SB1A:
1852                 set_uncached_handler(0x100, &except_vec2_sb1, 0x80);
1853                 break;
1854
1855         default:
1856                 set_uncached_handler(0x100, &except_vec2_generic, 0x80);
1857                 break;
1858         }
1859 }
1860
1861 void r4k_cache_init(void)
1862 {
1863         extern void build_clear_page(void);
1864         extern void build_copy_page(void);
1865         struct cpuinfo_mips *c = &current_cpu_data;
1866
1867         probe_pcache();
1868         probe_vcache();
1869         setup_scache();
1870
1871         r4k_blast_dcache_page_setup();
1872         r4k_blast_dcache_page_indexed_setup();
1873         r4k_blast_dcache_setup();
1874         r4k_blast_icache_page_setup();
1875         r4k_blast_icache_page_indexed_setup();
1876         r4k_blast_icache_setup();
1877         r4k_blast_scache_page_setup();
1878         r4k_blast_scache_page_indexed_setup();
1879         r4k_blast_scache_setup();
1880         r4k_blast_scache_node_setup();
1881 #ifdef CONFIG_EVA
1882         r4k_blast_dcache_user_page_setup();
1883         r4k_blast_icache_user_page_setup();
1884 #endif
1885
1886         /*
1887          * Some MIPS32 and MIPS64 processors have physically indexed caches.
1888          * This code supports virtually indexed processors and will be
1889          * unnecessarily inefficient on physically indexed processors.
1890          */
1891         if (c->dcache.linesz && cpu_has_dc_aliases)
1892                 shm_align_mask = max_t( unsigned long,
1893                                         c->dcache.sets * c->dcache.linesz - 1,
1894                                         PAGE_SIZE - 1);
1895         else
1896                 shm_align_mask = PAGE_SIZE-1;
1897
1898         __flush_cache_vmap      = r4k__flush_cache_vmap;
1899         __flush_cache_vunmap    = r4k__flush_cache_vunmap;
1900
1901         flush_cache_all         = cache_noop;
1902         __flush_cache_all       = r4k___flush_cache_all;
1903         flush_cache_mm          = r4k_flush_cache_mm;
1904         flush_cache_page        = r4k_flush_cache_page;
1905         flush_cache_range       = r4k_flush_cache_range;
1906
1907         __flush_kernel_vmap_range = r4k_flush_kernel_vmap_range;
1908
1909         flush_icache_all        = r4k_flush_icache_all;
1910         local_flush_data_cache_page     = local_r4k_flush_data_cache_page;
1911         flush_data_cache_page   = r4k_flush_data_cache_page;
1912         flush_icache_range      = r4k_flush_icache_range;
1913         local_flush_icache_range        = local_r4k_flush_icache_range;
1914         __flush_icache_user_range       = r4k_flush_icache_user_range;
1915         __local_flush_icache_user_range = local_r4k_flush_icache_user_range;
1916
1917 #ifdef CONFIG_DMA_NONCOHERENT
1918 #ifdef CONFIG_DMA_MAYBE_COHERENT
1919         if (coherentio == IO_COHERENCE_ENABLED ||
1920             (coherentio == IO_COHERENCE_DEFAULT && hw_coherentio)) {
1921                 _dma_cache_wback_inv    = (void *)cache_noop;
1922                 _dma_cache_wback        = (void *)cache_noop;
1923                 _dma_cache_inv          = (void *)cache_noop;
1924         } else
1925 #endif /* CONFIG_DMA_MAYBE_COHERENT */
1926         {
1927                 _dma_cache_wback_inv    = r4k_dma_cache_wback_inv;
1928                 _dma_cache_wback        = r4k_dma_cache_wback_inv;
1929                 _dma_cache_inv          = r4k_dma_cache_inv;
1930         }
1931 #endif /* CONFIG_DMA_NONCOHERENT */
1932
1933         build_clear_page();
1934         build_copy_page();
1935
1936         /*
1937          * We want to run CMP kernels on core with and without coherent
1938          * caches. Therefore, do not use CONFIG_MIPS_CMP to decide whether
1939          * or not to flush caches.
1940          */
1941         local_r4k___flush_cache_all(NULL);
1942
1943         coherency_setup();
1944         board_cache_error_setup = r4k_cache_error_setup;
1945
1946         /*
1947          * Per-CPU overrides
1948          */
1949         switch (current_cpu_type()) {
1950         case CPU_BMIPS4350:
1951         case CPU_BMIPS4380:
1952                 /* No IPI is needed because all CPUs share the same D$ */
1953                 flush_data_cache_page = r4k_blast_dcache_page;
1954                 break;
1955         case CPU_BMIPS5000:
1956                 /* We lose our superpowers if L2 is disabled */
1957                 if (c->scache.flags & MIPS_CACHE_NOT_PRESENT)
1958                         break;
1959
1960                 /* I$ fills from D$ just by emptying the write buffers */
1961                 flush_cache_page = (void *)b5k_instruction_hazard;
1962                 flush_cache_range = (void *)b5k_instruction_hazard;
1963                 local_flush_data_cache_page = (void *)b5k_instruction_hazard;
1964                 flush_data_cache_page = (void *)b5k_instruction_hazard;
1965                 flush_icache_range = (void *)b5k_instruction_hazard;
1966                 local_flush_icache_range = (void *)b5k_instruction_hazard;
1967
1968
1969                 /* Optimization: an L2 flush implicitly flushes the L1 */
1970                 current_cpu_data.options |= MIPS_CPU_INCLUSIVE_CACHES;
1971                 break;
1972         case CPU_LOONGSON64:
1973                 /* Loongson-3 maintains cache coherency by hardware */
1974                 __flush_cache_all       = cache_noop;
1975                 __flush_cache_vmap      = cache_noop;
1976                 __flush_cache_vunmap    = cache_noop;
1977                 __flush_kernel_vmap_range = (void *)cache_noop;
1978                 flush_cache_mm          = (void *)cache_noop;
1979                 flush_cache_page        = (void *)cache_noop;
1980                 flush_cache_range       = (void *)cache_noop;
1981                 flush_icache_all        = (void *)cache_noop;
1982                 flush_data_cache_page   = (void *)cache_noop;
1983                 local_flush_data_cache_page     = (void *)cache_noop;
1984                 break;
1985         }
1986 }
1987
1988 static int r4k_cache_pm_notifier(struct notifier_block *self, unsigned long cmd,
1989                                void *v)
1990 {
1991         switch (cmd) {
1992         case CPU_PM_ENTER_FAILED:
1993         case CPU_PM_EXIT:
1994                 coherency_setup();
1995                 break;
1996         }
1997
1998         return NOTIFY_OK;
1999 }
2000
2001 static struct notifier_block r4k_cache_pm_notifier_block = {
2002         .notifier_call = r4k_cache_pm_notifier,
2003 };
2004
2005 int __init r4k_cache_init_pm(void)
2006 {
2007         return cpu_pm_register_notifier(&r4k_cache_pm_notifier_block);
2008 }
2009 arch_initcall(r4k_cache_init_pm);