root/arch/mips/mm/c-r4k.c

DEFINITIONS

1. r4k_op_needs_ipi
2. r4k_on_each_cpu
3. cache_noop
4. r4k_blast_dcache_page_dc32
5. r4k_blast_dcache_page_dc64
6. r4k_blast_dcache_page_dc128
7. r4k_blast_dcache_page_setup
8. r4k_blast_dcache_user_page_setup
9. r4k_blast_dcache_page_indexed_setup
10. r4k_blast_dcache_setup
11. blast_r4600_v1_icache32
12. tx49_blast_icache32
13. blast_icache32_r4600_v1_page_indexed
14. tx49_blast_icache32_page_indexed
15. r4k_blast_icache_page_setup
16. r4k_blast_icache_user_page_setup
17. r4k_blast_icache_page_indexed_setup
18. r4k_blast_icache_setup
19. r4k_blast_scache_page_setup
20. r4k_blast_scache_page_indexed_setup
21. r4k_blast_scache_setup
22. r4k_blast_scache_node_setup
23. local_r4k___flush_cache_all
24. r4k___flush_cache_all
25. has_valid_asid
26. r4k__flush_cache_vmap
27. r4k__flush_cache_vunmap
28. local_r4k_flush_cache_range
29. r4k_flush_cache_range
30. local_r4k_flush_cache_mm
31. r4k_flush_cache_mm
32. local_r4k_flush_cache_page
33. r4k_flush_cache_page
34. local_r4k_flush_data_cache_page
35. r4k_flush_data_cache_page
36. __local_r4k_flush_icache_range
37. local_r4k_flush_icache_range
38. local_r4k_flush_icache_user_range
39. local_r4k_flush_icache_range_ipi
40. __r4k_flush_icache_range
41. r4k_flush_icache_range
42. r4k_flush_icache_user_range
43. r4k_dma_cache_wback_inv
44. r4k_dma_cache_inv
45. r4k_flush_icache_all
46. local_r4k_flush_kernel_vmap_range_index
47. local_r4k_flush_kernel_vmap_range
48. r4k_flush_kernel_vmap_range
49. rm7k_erratum31
50. alias_74k_erratum
51. b5k_instruction_hazard
52. probe_pcache
53. probe_vcache
54. probe_scache
55. loongson2_sc_init
56. loongson3_sc_init
57. setup_scache
58. au1x00_fixup_config_od
59. nxp_pr4450_fixup_config
60. cca_setup
61. coherency_setup
62. r4k_cache_error_setup
63. r4k_cache_init
64. r4k_cache_pm_notifier
65. r4k_cache_init_pm

   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/pgtable.h>
  33 #include <asm/r4kcache.h>
  34 #include <asm/sections.h>
  35 #include <asm/mmu_context.h>
  36 #include <asm/war.h>
  37 #include <asm/cacheflush.h> /* for run_uncached() */
  38 #include <asm/traps.h>
  39 #include <asm/dma-coherence.h>
  40 #include <asm/mips-cps.h>
  41 
  42 /*
  43  * Bits describing what cache ops an SMP callback function may perform.
  44  *
  45  * R4K_HIT   -  Virtual user or kernel address based cache operations. The
  46  *              active_mm must be checked before using user addresses, falling
  47  *              back to kmap.
  48  * R4K_INDEX -  Index based cache operations.
  49  */
  50 
  51 #define R4K_HIT         BIT(0)
  52 #define R4K_INDEX       BIT(1)
  53 
  54 /**
  55  * r4k_op_needs_ipi() - Decide if a cache op needs to be done on every core.
  56  * @type:       Type of cache operations (R4K_HIT or R4K_INDEX).
  57  *
  58  * Decides whether a cache op needs to be performed on every core in the system.
  59  * This may change depending on the @type of cache operation, as well as the set
  60  * of online CPUs, so preemption should be disabled by the caller to prevent CPU
  61  * hotplug from changing the result.
  62  *
  63  * Returns:     1 if the cache operation @type should be done on every core in
  64  *              the system.
  65  *              0 if the cache operation @type is globalized and only needs to
  66  *              be performed on a simple CPU.
  67  */
  68 static inline bool r4k_op_needs_ipi(unsigned int type)
  69 {
  70         /* The MIPS Coherence Manager (CM) globalizes address-based cache ops */
  71         if (type == R4K_HIT && mips_cm_present())
  72                 return false;
  73 
  74         /*
  75          * Hardware doesn't globalize the required cache ops, so SMP calls may
  76          * be needed, but only if there are foreign CPUs (non-siblings with
  77          * separate caches).
  78          */
  79         /* cpu_foreign_map[] undeclared when !CONFIG_SMP */
  80 #ifdef CONFIG_SMP
  81         return !cpumask_empty(&cpu_foreign_map[0]);
  82 #else
  83         return false;
  84 #endif
  85 }
  86 
  87 /*
  88  * Special Variant of smp_call_function for use by cache functions:
  89  *
  90  *  o No return value
  91  *  o collapses to normal function call on UP kernels
  92  *  o collapses to normal function call on systems with a single shared
  93  *    primary cache.
  94  *  o doesn't disable interrupts on the local CPU
  95  */
  96 static inline void r4k_on_each_cpu(unsigned int type,
  97                                    void (*func)(void *info), void *info)
  98 {
  99         preempt_disable();
 100         if (r4k_op_needs_ipi(type))
 101                 smp_call_function_many(&cpu_foreign_map[smp_processor_id()],
 102                                        func, info, 1);
 103         func(info);
 104         preempt_enable();
 105 }
 106 
 107 /*
 108  * Must die.
 109  */
 110 static unsigned long icache_size __read_mostly;
 111 static unsigned long dcache_size __read_mostly;
 112 static unsigned long vcache_size __read_mostly;
 113 static unsigned long scache_size __read_mostly;
 114 
 115 /*
 116  * Dummy cache handling routines for machines without boardcaches
 117  */
 118 static void cache_noop(void) {}
 119 
 120 static struct bcache_ops no_sc_ops = {
 121         .bc_enable = (void *)cache_noop,
 122         .bc_disable = (void *)cache_noop,
 123         .bc_wback_inv = (void *)cache_noop,
 124         .bc_inv = (void *)cache_noop
 125 };
 126 
 127 struct bcache_ops *bcops = &no_sc_ops;
 128 
 129 #define cpu_is_r4600_v1_x()     ((read_c0_prid() & 0xfffffff0) == 0x00002010)
 130 #define cpu_is_r4600_v2_x()     ((read_c0_prid() & 0xfffffff0) == 0x00002020)
 131 
 132 #define R4600_HIT_CACHEOP_WAR_IMPL                                      \
 133 do {                                                                    \
 134         if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x())            \
 135                 *(volatile unsigned long *)CKSEG1;                      \
 136         if (R4600_V1_HIT_CACHEOP_WAR)                                   \
 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 TX49XX_ICACHE_INDEX_INV_WAR) */
 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                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 275         CACHE32_UNROLL32_ALIGN;
 276         /* I'm in odd chunk.  blast even chunks */
 277         for (ws = 0; ws < ws_end; ws += ws_inc)
 278                 for (addr = start; addr < end; addr += 0x400 * 2)
 279                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 280 }
 281 
 282 static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page)
 283 {
 284         unsigned long flags;
 285 
 286         local_irq_save(flags);
 287         blast_icache32_page_indexed(page);
 288         local_irq_restore(flags);
 289 }
 290 
 291 static inline void tx49_blast_icache32_page_indexed(unsigned long page)
 292 {
 293         unsigned long indexmask = current_cpu_data.icache.waysize - 1;
 294         unsigned long start = INDEX_BASE + (page & indexmask);
 295         unsigned long end = start + PAGE_SIZE;
 296         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 297         unsigned long ws_end = current_cpu_data.icache.ways <<
 298                                current_cpu_data.icache.waybit;
 299         unsigned long ws, addr;
 300 
 301         CACHE32_UNROLL32_ALIGN2;
 302         /* I'm in even chunk.  blast odd chunks */
 303         for (ws = 0; ws < ws_end; ws += ws_inc)
 304                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 305                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 306         CACHE32_UNROLL32_ALIGN;
 307         /* I'm in odd chunk.  blast even chunks */
 308         for (ws = 0; ws < ws_end; ws += ws_inc)
 309                 for (addr = start; addr < end; addr += 0x400 * 2)
 310                         cache32_unroll32(addr|ws, Index_Invalidate_I);
 311 }
 312 
 313 static void (* r4k_blast_icache_page)(unsigned long addr);
 314 
 315 static void r4k_blast_icache_page_setup(void)
 316 {
 317         unsigned long ic_lsize = cpu_icache_line_size();
 318 
 319         if (ic_lsize == 0)
 320                 r4k_blast_icache_page = (void *)cache_noop;
 321         else if (ic_lsize == 16)
 322                 r4k_blast_icache_page = blast_icache16_page;
 323         else if (ic_lsize == 32 && current_cpu_type() == CPU_LOONGSON2)
 324                 r4k_blast_icache_page = loongson2_blast_icache32_page;
 325         else if (ic_lsize == 32)
 326                 r4k_blast_icache_page = blast_icache32_page;
 327         else if (ic_lsize == 64)
 328                 r4k_blast_icache_page = blast_icache64_page;
 329         else if (ic_lsize == 128)
 330                 r4k_blast_icache_page = blast_icache128_page;
 331 }
 332 
 333 #ifndef CONFIG_EVA
 334 #define r4k_blast_icache_user_page  r4k_blast_icache_page
 335 #else
 336 
 337 static void (*r4k_blast_icache_user_page)(unsigned long addr);
 338 
 339 static void r4k_blast_icache_user_page_setup(void)
 340 {
 341         unsigned long ic_lsize = cpu_icache_line_size();
 342 
 343         if (ic_lsize == 0)
 344                 r4k_blast_icache_user_page = (void *)cache_noop;
 345         else if (ic_lsize == 16)
 346                 r4k_blast_icache_user_page = blast_icache16_user_page;
 347         else if (ic_lsize == 32)
 348                 r4k_blast_icache_user_page = blast_icache32_user_page;
 349         else if (ic_lsize == 64)
 350                 r4k_blast_icache_user_page = blast_icache64_user_page;
 351 }
 352 
 353 #endif
 354 
 355 static void (* r4k_blast_icache_page_indexed)(unsigned long addr);
 356 
 357 static void r4k_blast_icache_page_indexed_setup(void)
 358 {
 359         unsigned long ic_lsize = cpu_icache_line_size();
 360 
 361         if (ic_lsize == 0)
 362                 r4k_blast_icache_page_indexed = (void *)cache_noop;
 363         else if (ic_lsize == 16)
 364                 r4k_blast_icache_page_indexed = blast_icache16_page_indexed;
 365         else if (ic_lsize == 32) {
 366                 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
 367                         r4k_blast_icache_page_indexed =
 368                                 blast_icache32_r4600_v1_page_indexed;
 369                 else if (TX49XX_ICACHE_INDEX_INV_WAR)
 370                         r4k_blast_icache_page_indexed =
 371                                 tx49_blast_icache32_page_indexed;
 372                 else if (current_cpu_type() == CPU_LOONGSON2)
 373                         r4k_blast_icache_page_indexed =
 374                                 loongson2_blast_icache32_page_indexed;
 375                 else
 376                         r4k_blast_icache_page_indexed =
 377                                 blast_icache32_page_indexed;
 378         } else if (ic_lsize == 64)
 379                 r4k_blast_icache_page_indexed = blast_icache64_page_indexed;
 380 }
 381 
 382 void (* r4k_blast_icache)(void);
 383 EXPORT_SYMBOL(r4k_blast_icache);
 384 
 385 static void r4k_blast_icache_setup(void)
 386 {
 387         unsigned long ic_lsize = cpu_icache_line_size();
 388 
 389         if (ic_lsize == 0)
 390                 r4k_blast_icache = (void *)cache_noop;
 391         else if (ic_lsize == 16)
 392                 r4k_blast_icache = blast_icache16;
 393         else if (ic_lsize == 32) {
 394                 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
 395                         r4k_blast_icache = blast_r4600_v1_icache32;
 396                 else if (TX49XX_ICACHE_INDEX_INV_WAR)
 397                         r4k_blast_icache = tx49_blast_icache32;
 398                 else if (current_cpu_type() == CPU_LOONGSON2)
 399                         r4k_blast_icache = loongson2_blast_icache32;
 400                 else
 401                         r4k_blast_icache = blast_icache32;
 402         } else if (ic_lsize == 64)
 403                 r4k_blast_icache = blast_icache64;
 404         else if (ic_lsize == 128)
 405                 r4k_blast_icache = blast_icache128;
 406 }
 407 
 408 static void (* r4k_blast_scache_page)(unsigned long addr);
 409 
 410 static void r4k_blast_scache_page_setup(void)
 411 {
 412         unsigned long sc_lsize = cpu_scache_line_size();
 413 
 414         if (scache_size == 0)
 415                 r4k_blast_scache_page = (void *)cache_noop;
 416         else if (sc_lsize == 16)
 417                 r4k_blast_scache_page = blast_scache16_page;
 418         else if (sc_lsize == 32)
 419                 r4k_blast_scache_page = blast_scache32_page;
 420         else if (sc_lsize == 64)
 421                 r4k_blast_scache_page = blast_scache64_page;
 422         else if (sc_lsize == 128)
 423                 r4k_blast_scache_page = blast_scache128_page;
 424 }
 425 
 426 static void (* r4k_blast_scache_page_indexed)(unsigned long addr);
 427 
 428 static void r4k_blast_scache_page_indexed_setup(void)
 429 {
 430         unsigned long sc_lsize = cpu_scache_line_size();
 431 
 432         if (scache_size == 0)
 433                 r4k_blast_scache_page_indexed = (void *)cache_noop;
 434         else if (sc_lsize == 16)
 435                 r4k_blast_scache_page_indexed = blast_scache16_page_indexed;
 436         else if (sc_lsize == 32)
 437                 r4k_blast_scache_page_indexed = blast_scache32_page_indexed;
 438         else if (sc_lsize == 64)
 439                 r4k_blast_scache_page_indexed = blast_scache64_page_indexed;
 440         else if (sc_lsize == 128)
 441                 r4k_blast_scache_page_indexed = blast_scache128_page_indexed;
 442 }
 443 
 444 static void (* r4k_blast_scache)(void);
 445 
 446 static void r4k_blast_scache_setup(void)
 447 {
 448         unsigned long sc_lsize = cpu_scache_line_size();
 449 
 450         if (scache_size == 0)
 451                 r4k_blast_scache = (void *)cache_noop;
 452         else if (sc_lsize == 16)
 453                 r4k_blast_scache = blast_scache16;
 454         else if (sc_lsize == 32)
 455                 r4k_blast_scache = blast_scache32;
 456         else if (sc_lsize == 64)
 457                 r4k_blast_scache = blast_scache64;
 458         else if (sc_lsize == 128)
 459                 r4k_blast_scache = blast_scache128;
 460 }
 461 
 462 static void (*r4k_blast_scache_node)(long node);
 463 
 464 static void r4k_blast_scache_node_setup(void)
 465 {
 466         unsigned long sc_lsize = cpu_scache_line_size();
 467 
 468         if (current_cpu_type() != CPU_LOONGSON3)
 469                 r4k_blast_scache_node = (void *)cache_noop;
 470         else if (sc_lsize == 16)
 471                 r4k_blast_scache_node = blast_scache16_node;
 472         else if (sc_lsize == 32)
 473                 r4k_blast_scache_node = blast_scache32_node;
 474         else if (sc_lsize == 64)
 475                 r4k_blast_scache_node = blast_scache64_node;
 476         else if (sc_lsize == 128)
 477                 r4k_blast_scache_node = blast_scache128_node;
 478 }
 479 
 480 static inline void local_r4k___flush_cache_all(void * args)
 481 {
 482         switch (current_cpu_type()) {
 483         case CPU_LOONGSON2:
 484         case CPU_R4000SC:
 485         case CPU_R4000MC:
 486         case CPU_R4400SC:
 487         case CPU_R4400MC:
 488         case CPU_R10000:
 489         case CPU_R12000:
 490         case CPU_R14000:
 491         case CPU_R16000:
 492                 /*
 493                  * These caches are inclusive caches, that is, if something
 494                  * is not cached in the S-cache, we know it also won't be
 495                  * in one of the primary caches.
 496                  */
 497                 r4k_blast_scache();
 498                 break;
 499 
 500         case CPU_LOONGSON3:
 501                 /* Use get_ebase_cpunum() for both NUMA=y/n */
 502                 r4k_blast_scache_node(get_ebase_cpunum() >> 2);
 503                 break;
 504 
 505         case CPU_BMIPS5000:
 506                 r4k_blast_scache();
 507                 __sync();
 508                 break;
 509 
 510         default:
 511                 r4k_blast_dcache();
 512                 r4k_blast_icache();
 513                 break;
 514         }
 515 }
 516 
 517 static void r4k___flush_cache_all(void)
 518 {
 519         r4k_on_each_cpu(R4K_INDEX, local_r4k___flush_cache_all, NULL);
 520 }
 521 
 522 /**
 523  * has_valid_asid() - Determine if an mm already has an ASID.
 524  * @mm:         Memory map.
 525  * @type:       R4K_HIT or R4K_INDEX, type of cache op.
 526  *
 527  * Determines whether @mm already has an ASID on any of the CPUs which cache ops
 528  * of type @type within an r4k_on_each_cpu() call will affect. If
 529  * r4k_on_each_cpu() does an SMP call to a single VPE in each core, then the
 530  * scope of the operation is confined to sibling CPUs, otherwise all online CPUs
 531  * will need to be checked.
 532  *
 533  * Must be called in non-preemptive context.
 534  *
 535  * Returns:     1 if the CPUs affected by @type cache ops have an ASID for @mm.
 536  *              0 otherwise.
 537  */
 538 static inline int has_valid_asid(const struct mm_struct *mm, unsigned int type)
 539 {
 540         unsigned int i;
 541         const cpumask_t *mask = cpu_present_mask;
 542 
 543         if (cpu_has_mmid)
 544                 return cpu_context(0, mm) != 0;
 545 
 546         /* cpu_sibling_map[] undeclared when !CONFIG_SMP */
 547 #ifdef CONFIG_SMP
 548         /*
 549          * If r4k_on_each_cpu does SMP calls, it does them to a single VPE in
 550          * each foreign core, so we only need to worry about siblings.
 551          * Otherwise we need to worry about all present CPUs.
 552          */
 553         if (r4k_op_needs_ipi(type))
 554                 mask = &cpu_sibling_map[smp_processor_id()];
 555 #endif
 556         for_each_cpu(i, mask)
 557                 if (cpu_context(i, mm))
 558                         return 1;
 559         return 0;
 560 }
 561 
 562 static void r4k__flush_cache_vmap(void)
 563 {
 564         r4k_blast_dcache();
 565 }
 566 
 567 static void r4k__flush_cache_vunmap(void)
 568 {
 569         r4k_blast_dcache();
 570 }
 571 
 572 /*
 573  * Note: flush_tlb_range() assumes flush_cache_range() sufficiently flushes
 574  * whole caches when vma is executable.
 575  */
 576 static inline void local_r4k_flush_cache_range(void * args)
 577 {
 578         struct vm_area_struct *vma = args;
 579         int exec = vma->vm_flags & VM_EXEC;
 580 
 581         if (!has_valid_asid(vma->vm_mm, R4K_INDEX))
 582                 return;
 583 
 584         /*
 585          * If dcache can alias, we must blast it since mapping is changing.
 586          * If executable, we must ensure any dirty lines are written back far
 587          * enough to be visible to icache.
 588          */
 589         if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc))
 590                 r4k_blast_dcache();
 591         /* If executable, blast stale lines from icache */
 592         if (exec)
 593                 r4k_blast_icache();
 594 }
 595 
 596 static void r4k_flush_cache_range(struct vm_area_struct *vma,
 597         unsigned long start, unsigned long end)
 598 {
 599         int exec = vma->vm_flags & VM_EXEC;
 600 
 601         if (cpu_has_dc_aliases || exec)
 602                 r4k_on_each_cpu(R4K_INDEX, local_r4k_flush_cache_range, vma);
 603 }
 604 
 605 static inline void local_r4k_flush_cache_mm(void * args)
 606 {
 607         struct mm_struct *mm = args;
 608 
 609         if (!has_valid_asid(mm, R4K_INDEX))
 610                 return;
 611 
 612         /*
 613          * Kludge alert.  For obscure reasons R4000SC and R4400SC go nuts if we
 614          * only flush the primary caches but R1x000 behave sane ...
 615          * R4000SC and R4400SC indexed S-cache ops also invalidate primary
 616          * caches, so we can bail out early.
 617          */
 618         if (current_cpu_type() == CPU_R4000SC ||
 619             current_cpu_type() == CPU_R4000MC ||
 620             current_cpu_type() == CPU_R4400SC ||
 621             current_cpu_type() == CPU_R4400MC) {
 622                 r4k_blast_scache();
 623                 return;
 624         }
 625 
 626         r4k_blast_dcache();
 627 }
 628 
 629 static void r4k_flush_cache_mm(struct mm_struct *mm)
 630 {
 631         if (!cpu_has_dc_aliases)
 632                 return;
 633 
 634         r4k_on_each_cpu(R4K_INDEX, local_r4k_flush_cache_mm, mm);
 635 }
 636 
 637 struct flush_cache_page_args {
 638         struct vm_area_struct *vma;
 639         unsigned long addr;
 640         unsigned long pfn;
 641 };
 642 
 643 static inline void local_r4k_flush_cache_page(void *args)
 644 {
 645         struct flush_cache_page_args *fcp_args = args;
 646         struct vm_area_struct *vma = fcp_args->vma;
 647         unsigned long addr = fcp_args->addr;
 648         struct page *page = pfn_to_page(fcp_args->pfn);
 649         int exec = vma->vm_flags & VM_EXEC;
 650         struct mm_struct *mm = vma->vm_mm;
 651         int map_coherent = 0;
 652         pgd_t *pgdp;
 653         pud_t *pudp;
 654         pmd_t *pmdp;
 655         pte_t *ptep;
 656         void *vaddr;
 657 
 658         /*
 659          * If owns no valid ASID yet, cannot possibly have gotten
 660          * this page into the cache.
 661          */
 662         if (!has_valid_asid(mm, R4K_HIT))
 663                 return;
 664 
 665         addr &= PAGE_MASK;
 666         pgdp = pgd_offset(mm, addr);
 667         pudp = pud_offset(pgdp, addr);
 668         pmdp = pmd_offset(pudp, addr);
 669         ptep = pte_offset(pmdp, addr);
 670 
 671         /*
 672          * If the page isn't marked valid, the page cannot possibly be
 673          * in the cache.
 674          */
 675         if (!(pte_present(*ptep)))
 676                 return;
 677 
 678         if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID))
 679                 vaddr = NULL;
 680         else {
 681                 /*
 682                  * Use kmap_coherent or kmap_atomic to do flushes for
 683                  * another ASID than the current one.
 684                  */
 685                 map_coherent = (cpu_has_dc_aliases &&
 686                                 page_mapcount(page) &&
 687                                 !Page_dcache_dirty(page));
 688                 if (map_coherent)
 689                         vaddr = kmap_coherent(page, addr);
 690                 else
 691                         vaddr = kmap_atomic(page);
 692                 addr = (unsigned long)vaddr;
 693         }
 694 
 695         if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
 696                 vaddr ? r4k_blast_dcache_page(addr) :
 697                         r4k_blast_dcache_user_page(addr);
 698                 if (exec && !cpu_icache_snoops_remote_store)
 699                         r4k_blast_scache_page(addr);
 700         }
 701         if (exec) {
 702                 if (vaddr && cpu_has_vtag_icache && mm == current->active_mm) {
 703                         drop_mmu_context(mm);
 704                 } else
 705                         vaddr ? r4k_blast_icache_page(addr) :
 706                                 r4k_blast_icache_user_page(addr);
 707         }
 708 
 709         if (vaddr) {
 710                 if (map_coherent)
 711                         kunmap_coherent();
 712                 else
 713                         kunmap_atomic(vaddr);
 714         }
 715 }
 716 
 717 static void r4k_flush_cache_page(struct vm_area_struct *vma,
 718         unsigned long addr, unsigned long pfn)
 719 {
 720         struct flush_cache_page_args args;
 721 
 722         args.vma = vma;
 723         args.addr = addr;
 724         args.pfn = pfn;
 725 
 726         r4k_on_each_cpu(R4K_HIT, local_r4k_flush_cache_page, &args);
 727 }
 728 
 729 static inline void local_r4k_flush_data_cache_page(void * addr)
 730 {
 731         r4k_blast_dcache_page((unsigned long) addr);
 732 }
 733 
 734 static void r4k_flush_data_cache_page(unsigned long addr)
 735 {
 736         if (in_atomic())
 737                 local_r4k_flush_data_cache_page((void *)addr);
 738         else
 739                 r4k_on_each_cpu(R4K_HIT, local_r4k_flush_data_cache_page,
 740                                 (void *) addr);
 741 }
 742 
 743 struct flush_icache_range_args {
 744         unsigned long start;
 745         unsigned long end;
 746         unsigned int type;
 747         bool user;
 748 };
 749 
 750 static inline void __local_r4k_flush_icache_range(unsigned long start,
 751                                                   unsigned long end,
 752                                                   unsigned int type,
 753                                                   bool user)
 754 {
 755         if (!cpu_has_ic_fills_f_dc) {
 756                 if (type == R4K_INDEX ||
 757                     (type & R4K_INDEX && end - start >= dcache_size)) {
 758                         r4k_blast_dcache();
 759                 } else {
 760                         R4600_HIT_CACHEOP_WAR_IMPL;
 761                         if (user)
 762                                 protected_blast_dcache_range(start, end);
 763                         else
 764                                 blast_dcache_range(start, end);
 765                 }
 766         }
 767 
 768         if (type == R4K_INDEX ||
 769             (type & R4K_INDEX && end - start > icache_size))
 770                 r4k_blast_icache();
 771         else {
 772                 switch (boot_cpu_type()) {
 773                 case CPU_LOONGSON2:
 774                         protected_loongson2_blast_icache_range(start, end);
 775                         break;
 776 
 777                 default:
 778                         if (user)
 779                                 protected_blast_icache_range(start, end);
 780                         else
 781                                 blast_icache_range(start, end);
 782                         break;
 783                 }
 784         }
 785 }
 786 
 787 static inline void local_r4k_flush_icache_range(unsigned long start,
 788                                                 unsigned long end)
 789 {
 790         __local_r4k_flush_icache_range(start, end, R4K_HIT | R4K_INDEX, false);
 791 }
 792 
 793 static inline void local_r4k_flush_icache_user_range(unsigned long start,
 794                                                      unsigned long end)
 795 {
 796         __local_r4k_flush_icache_range(start, end, R4K_HIT | R4K_INDEX, true);
 797 }
 798 
 799 static inline void local_r4k_flush_icache_range_ipi(void *args)
 800 {
 801         struct flush_icache_range_args *fir_args = args;
 802         unsigned long start = fir_args->start;
 803         unsigned long end = fir_args->end;
 804         unsigned int type = fir_args->type;
 805         bool user = fir_args->user;
 806 
 807         __local_r4k_flush_icache_range(start, end, type, user);
 808 }
 809 
 810 static void __r4k_flush_icache_range(unsigned long start, unsigned long end,
 811                                      bool user)
 812 {
 813         struct flush_icache_range_args args;
 814         unsigned long size, cache_size;
 815 
 816         args.start = start;
 817         args.end = end;
 818         args.type = R4K_HIT | R4K_INDEX;
 819         args.user = user;
 820 
 821         /*
 822          * Indexed cache ops require an SMP call.
 823          * Consider if that can or should be avoided.
 824          */
 825         preempt_disable();
 826         if (r4k_op_needs_ipi(R4K_INDEX) && !r4k_op_needs_ipi(R4K_HIT)) {
 827                 /*
 828                  * If address-based cache ops don't require an SMP call, then
 829                  * use them exclusively for small flushes.
 830                  */
 831                 size = end - start;
 832                 cache_size = icache_size;
 833                 if (!cpu_has_ic_fills_f_dc) {
 834                         size *= 2;
 835                         cache_size += dcache_size;
 836                 }
 837                 if (size <= cache_size)
 838                         args.type &= ~R4K_INDEX;
 839         }
 840         r4k_on_each_cpu(args.type, local_r4k_flush_icache_range_ipi, &args);
 841         preempt_enable();
 842         instruction_hazard();
 843 }
 844 
 845 static void r4k_flush_icache_range(unsigned long start, unsigned long end)
 846 {
 847         return __r4k_flush_icache_range(start, end, false);
 848 }
 849 
 850 static void r4k_flush_icache_user_range(unsigned long start, unsigned long end)
 851 {
 852         return __r4k_flush_icache_range(start, end, true);
 853 }
 854 
 855 #ifdef CONFIG_DMA_NONCOHERENT
 856 
 857 static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
 858 {
 859         /* Catch bad driver code */
 860         if (WARN_ON(size == 0))
 861                 return;
 862 
 863         preempt_disable();
 864         if (cpu_has_inclusive_pcaches) {
 865                 if (size >= scache_size) {
 866                         if (current_cpu_type() != CPU_LOONGSON3)
 867                                 r4k_blast_scache();
 868                         else
 869                                 r4k_blast_scache_node(pa_to_nid(addr));
 870                 } else {
 871                         blast_scache_range(addr, addr + size);
 872                 }
 873                 preempt_enable();
 874                 __sync();
 875                 return;
 876         }
 877 
 878         /*
 879          * Either no secondary cache or the available caches don't have the
 880          * subset property so we have to flush the primary caches
 881          * explicitly.
 882          * If we would need IPI to perform an INDEX-type operation, then
 883          * we have to use the HIT-type alternative as IPI cannot be used
 884          * here due to interrupts possibly being disabled.
 885          */
 886         if (!r4k_op_needs_ipi(R4K_INDEX) && size >= dcache_size) {
 887                 r4k_blast_dcache();
 888         } else {
 889                 R4600_HIT_CACHEOP_WAR_IMPL;
 890                 blast_dcache_range(addr, addr + size);
 891         }
 892         preempt_enable();
 893 
 894         bc_wback_inv(addr, size);
 895         __sync();
 896 }
 897 
 898 static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
 899 {
 900         /* Catch bad driver code */
 901         if (WARN_ON(size == 0))
 902                 return;
 903 
 904         preempt_disable();
 905         if (cpu_has_inclusive_pcaches) {
 906                 if (size >= scache_size) {
 907                         if (current_cpu_type() != CPU_LOONGSON3)
 908                                 r4k_blast_scache();
 909                         else
 910                                 r4k_blast_scache_node(pa_to_nid(addr));
 911                 } else {
 912                         /*
 913                          * There is no clearly documented alignment requirement
 914                          * for the cache instruction on MIPS processors and
 915                          * some processors, among them the RM5200 and RM7000
 916                          * QED processors will throw an address error for cache
 917                          * hit ops with insufficient alignment.  Solved by
 918                          * aligning the address to cache line size.
 919                          */
 920                         blast_inv_scache_range(addr, addr + size);
 921                 }
 922                 preempt_enable();
 923                 __sync();
 924                 return;
 925         }
 926 
 927         if (!r4k_op_needs_ipi(R4K_INDEX) && size >= dcache_size) {
 928                 r4k_blast_dcache();
 929         } else {
 930                 R4600_HIT_CACHEOP_WAR_IMPL;
 931                 blast_inv_dcache_range(addr, addr + size);
 932         }
 933         preempt_enable();
 934 
 935         bc_inv(addr, size);
 936         __sync();
 937 }
 938 #endif /* CONFIG_DMA_NONCOHERENT */
 939 
 940 static void r4k_flush_icache_all(void)
 941 {
 942         if (cpu_has_vtag_icache)
 943                 r4k_blast_icache();
 944 }
 945 
 946 struct flush_kernel_vmap_range_args {
 947         unsigned long   vaddr;
 948         int             size;
 949 };
 950 
 951 static inline void local_r4k_flush_kernel_vmap_range_index(void *args)
 952 {
 953         /*
 954          * Aliases only affect the primary caches so don't bother with
 955          * S-caches or T-caches.
 956          */
 957         r4k_blast_dcache();
 958 }
 959 
 960 static inline void local_r4k_flush_kernel_vmap_range(void *args)
 961 {
 962         struct flush_kernel_vmap_range_args *vmra = args;
 963         unsigned long vaddr = vmra->vaddr;
 964         int size = vmra->size;
 965 
 966         /*
 967          * Aliases only affect the primary caches so don't bother with
 968          * S-caches or T-caches.
 969          */
 970         R4600_HIT_CACHEOP_WAR_IMPL;
 971         blast_dcache_range(vaddr, vaddr + size);
 972 }
 973 
 974 static void r4k_flush_kernel_vmap_range(unsigned long vaddr, int size)
 975 {
 976         struct flush_kernel_vmap_range_args args;
 977 
 978         args.vaddr = (unsigned long) vaddr;
 979         args.size = size;
 980 
 981         if (size >= dcache_size)
 982                 r4k_on_each_cpu(R4K_INDEX,
 983                                 local_r4k_flush_kernel_vmap_range_index, NULL);
 984         else
 985                 r4k_on_each_cpu(R4K_HIT, local_r4k_flush_kernel_vmap_range,
 986                                 &args);
 987 }
 988 
 989 static inline void rm7k_erratum31(void)
 990 {
 991         const unsigned long ic_lsize = 32;
 992         unsigned long addr;
 993 
 994         /* RM7000 erratum #31. The icache is screwed at startup. */
 995         write_c0_taglo(0);
 996         write_c0_taghi(0);
 997 
 998         for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) {
 999                 __asm__ __volatile__ (
1000                         ".set push\n\t"
1001                         ".set noreorder\n\t"
1002                         ".set mips3\n\t"
1003                         "cache\t%1, 0(%0)\n\t"
1004                         "cache\t%1, 0x1000(%0)\n\t"
1005                         "cache\t%1, 0x2000(%0)\n\t"
1006                         "cache\t%1, 0x3000(%0)\n\t"
1007                         "cache\t%2, 0(%0)\n\t"
1008                         "cache\t%2, 0x1000(%0)\n\t"
1009                         "cache\t%2, 0x2000(%0)\n\t"
1010                         "cache\t%2, 0x3000(%0)\n\t"
1011                         "cache\t%1, 0(%0)\n\t"
1012                         "cache\t%1, 0x1000(%0)\n\t"
1013                         "cache\t%1, 0x2000(%0)\n\t"
1014                         "cache\t%1, 0x3000(%0)\n\t"
1015                         ".set pop\n"
1016                         :
1017                         : "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill));
1018         }
1019 }
1020 
1021 static inline int alias_74k_erratum(struct cpuinfo_mips *c)
1022 {
1023         unsigned int imp = c->processor_id & PRID_IMP_MASK;
1024         unsigned int rev = c->processor_id & PRID_REV_MASK;
1025         int present = 0;
1026 
1027         /*
1028          * Early versions of the 74K do not update the cache tags on a
1029          * vtag miss/ptag hit which can occur in the case of KSEG0/KUSEG
1030          * aliases.  In this case it is better to treat the cache as always
1031          * having aliases.  Also disable the synonym tag update feature
1032          * where available.  In this case no opportunistic tag update will
1033          * happen where a load causes a virtual address miss but a physical
1034          * address hit during a D-cache look-up.
1035          */
1036         switch (imp) {
1037         case PRID_IMP_74K:
1038                 if (rev <= PRID_REV_ENCODE_332(2, 4, 0))
1039                         present = 1;
1040                 if (rev == PRID_REV_ENCODE_332(2, 4, 0))
1041                         write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND);
1042                 break;
1043         case PRID_IMP_1074K:
1044                 if (rev <= PRID_REV_ENCODE_332(1, 1, 0)) {
1045                         present = 1;
1046                         write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND);
1047                 }
1048                 break;
1049         default:
1050                 BUG();
1051         }
1052 
1053         return present;
1054 }
1055 
1056 static void b5k_instruction_hazard(void)
1057 {
1058         __sync();
1059         __sync();
1060         __asm__ __volatile__(
1061         "       nop; nop; nop; nop; nop; nop; nop; nop\n"
1062         "       nop; nop; nop; nop; nop; nop; nop; nop\n"
1063         "       nop; nop; nop; nop; nop; nop; nop; nop\n"
1064         "       nop; nop; nop; nop; nop; nop; nop; nop\n"
1065         : : : "memory");
1066 }
1067 
1068 static char *way_string[] = { NULL, "direct mapped", "2-way",
1069         "3-way", "4-way", "5-way", "6-way", "7-way", "8-way",
1070         "9-way", "10-way", "11-way", "12-way",
1071         "13-way", "14-way", "15-way", "16-way",
1072 };
1073 
1074 static void probe_pcache(void)
1075 {
1076         struct cpuinfo_mips *c = &current_cpu_data;
1077         unsigned int config = read_c0_config();
1078         unsigned int prid = read_c0_prid();
1079         int has_74k_erratum = 0;
1080         unsigned long config1;
1081         unsigned int lsize;
1082 
1083         switch (current_cpu_type()) {
1084         case CPU_R4600:                 /* QED style two way caches? */
1085         case CPU_R4700:
1086         case CPU_R5000:
1087         case CPU_NEVADA:
1088                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
1089                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1090                 c->icache.ways = 2;
1091                 c->icache.waybit = __ffs(icache_size/2);
1092 
1093                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
1094                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1095                 c->dcache.ways = 2;
1096                 c->dcache.waybit= __ffs(dcache_size/2);
1097 
1098                 c->options |= MIPS_CPU_CACHE_CDEX_P;
1099                 break;
1100 
1101         case CPU_R5500:
1102                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
1103                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1104                 c->icache.ways = 2;
1105                 c->icache.waybit= 0;
1106 
1107                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
1108                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1109                 c->dcache.ways = 2;
1110                 c->dcache.waybit = 0;
1111 
1112                 c->options |= MIPS_CPU_CACHE_CDEX_P | MIPS_CPU_PREFETCH;
1113                 break;
1114 
1115         case CPU_TX49XX:
1116                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
1117                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1118                 c->icache.ways = 4;
1119                 c->icache.waybit= 0;
1120 
1121                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
1122                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1123                 c->dcache.ways = 4;
1124                 c->dcache.waybit = 0;
1125 
1126                 c->options |= MIPS_CPU_CACHE_CDEX_P;
1127                 c->options |= MIPS_CPU_PREFETCH;
1128                 break;
1129 
1130         case CPU_R4000PC:
1131         case CPU_R4000SC:
1132         case CPU_R4000MC:
1133         case CPU_R4400PC:
1134         case CPU_R4400SC:
1135         case CPU_R4400MC:
1136                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
1137                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1138                 c->icache.ways = 1;
1139                 c->icache.waybit = 0;   /* doesn't matter */
1140 
1141                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
1142                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1143                 c->dcache.ways = 1;
1144                 c->dcache.waybit = 0;   /* does not matter */
1145 
1146                 c->options |= MIPS_CPU_CACHE_CDEX_P;
1147                 break;
1148 
1149         case CPU_R10000:
1150         case CPU_R12000:
1151         case CPU_R14000:
1152         case CPU_R16000:
1153                 icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29));
1154                 c->icache.linesz = 64;
1155                 c->icache.ways = 2;
1156                 c->icache.waybit = 0;
1157 
1158                 dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26));
1159                 c->dcache.linesz = 32;
1160                 c->dcache.ways = 2;
1161                 c->dcache.waybit = 0;
1162 
1163                 c->options |= MIPS_CPU_PREFETCH;
1164                 break;
1165 
1166         case CPU_VR4133:
1167                 write_c0_config(config & ~VR41_CONF_P4K);
1168                 /* fall through */
1169         case CPU_VR4131:
1170                 /* Workaround for cache instruction bug of VR4131 */
1171                 if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U ||
1172                     c->processor_id == 0x0c82U) {
1173                         config |= 0x00400000U;
1174                         if (c->processor_id == 0x0c80U)
1175                                 config |= VR41_CONF_BP;
1176                         write_c0_config(config);
1177                 } else
1178                         c->options |= MIPS_CPU_CACHE_CDEX_P;
1179 
1180                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
1181                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1182                 c->icache.ways = 2;
1183                 c->icache.waybit = __ffs(icache_size/2);
1184 
1185                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
1186                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1187                 c->dcache.ways = 2;
1188                 c->dcache.waybit = __ffs(dcache_size/2);
1189                 break;
1190 
1191         case CPU_VR41XX:
1192         case CPU_VR4111:
1193         case CPU_VR4121:
1194         case CPU_VR4122:
1195         case CPU_VR4181:
1196         case CPU_VR4181A:
1197                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
1198                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1199                 c->icache.ways = 1;
1200                 c->icache.waybit = 0;   /* doesn't matter */
1201 
1202                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
1203                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1204                 c->dcache.ways = 1;
1205                 c->dcache.waybit = 0;   /* does not matter */
1206 
1207                 c->options |= MIPS_CPU_CACHE_CDEX_P;
1208                 break;
1209 
1210         case CPU_RM7000:
1211                 rm7k_erratum31();
1212 
1213                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
1214                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1215                 c->icache.ways = 4;
1216                 c->icache.waybit = __ffs(icache_size / c->icache.ways);
1217 
1218                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
1219                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1220                 c->dcache.ways = 4;
1221                 c->dcache.waybit = __ffs(dcache_size / c->dcache.ways);
1222 
1223                 c->options |= MIPS_CPU_CACHE_CDEX_P;
1224                 c->options |= MIPS_CPU_PREFETCH;
1225                 break;
1226 
1227         case CPU_LOONGSON2:
1228                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
1229                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1230                 if (prid & 0x3)
1231                         c->icache.ways = 4;
1232                 else
1233                         c->icache.ways = 2;
1234                 c->icache.waybit = 0;
1235 
1236                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
1237                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1238                 if (prid & 0x3)
1239                         c->dcache.ways = 4;
1240                 else
1241                         c->dcache.ways = 2;
1242                 c->dcache.waybit = 0;
1243                 break;
1244 
1245         case CPU_LOONGSON3:
1246                 config1 = read_c0_config1();
1247                 lsize = (config1 >> 19) & 7;
1248                 if (lsize)
1249                         c->icache.linesz = 2 << lsize;
1250                 else
1251                         c->icache.linesz = 0;
1252                 c->icache.sets = 64 << ((config1 >> 22) & 7);
1253                 c->icache.ways = 1 + ((config1 >> 16) & 7);
1254                 icache_size = c->icache.sets *
1255                                           c->icache.ways *
1256                                           c->icache.linesz;
1257                 c->icache.waybit = 0;
1258 
1259                 lsize = (config1 >> 10) & 7;
1260                 if (lsize)
1261                         c->dcache.linesz = 2 << lsize;
1262                 else
1263                         c->dcache.linesz = 0;
1264                 c->dcache.sets = 64 << ((config1 >> 13) & 7);
1265                 c->dcache.ways = 1 + ((config1 >> 7) & 7);
1266                 dcache_size = c->dcache.sets *
1267                                           c->dcache.ways *
1268                                           c->dcache.linesz;
1269                 c->dcache.waybit = 0;
1270                 if ((prid & PRID_REV_MASK) >= PRID_REV_LOONGSON3A_R2_0)
1271                         c->options |= MIPS_CPU_PREFETCH;
1272                 break;
1273 
1274         case CPU_CAVIUM_OCTEON3:
1275                 /* For now lie about the number of ways. */
1276                 c->icache.linesz = 128;
1277                 c->icache.sets = 16;
1278                 c->icache.ways = 8;
1279                 c->icache.flags |= MIPS_CACHE_VTAG;
1280                 icache_size = c->icache.sets * c->icache.ways * c->icache.linesz;
1281 
1282                 c->dcache.linesz = 128;
1283                 c->dcache.ways = 8;
1284                 c->dcache.sets = 8;
1285                 dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz;
1286                 c->options |= MIPS_CPU_PREFETCH;
1287                 break;
1288 
1289         default:
1290                 if (!(config & MIPS_CONF_M))
1291                         panic("Don't know how to probe P-caches on this cpu.");
1292 
1293                 /*
1294                  * So we seem to be a MIPS32 or MIPS64 CPU
1295                  * So let's probe the I-cache ...
1296                  */
1297                 config1 = read_c0_config1();
1298 
1299                 lsize = (config1 >> 19) & 7;
1300 
1301                 /* IL == 7 is reserved */
1302                 if (lsize == 7)
1303                         panic("Invalid icache line size");
1304 
1305                 c->icache.linesz = lsize ? 2 << lsize : 0;
1306 
1307                 c->icache.sets = 32 << (((config1 >> 22) + 1) & 7);
1308                 c->icache.ways = 1 + ((config1 >> 16) & 7);
1309 
1310                 icache_size = c->icache.sets *
1311                               c->icache.ways *
1312                               c->icache.linesz;
1313                 c->icache.waybit = __ffs(icache_size/c->icache.ways);
1314 
1315                 if (config & MIPS_CONF_VI)
1316                         c->icache.flags |= MIPS_CACHE_VTAG;
1317 
1318                 /*
1319                  * Now probe the MIPS32 / MIPS64 data cache.
1320                  */
1321                 c->dcache.flags = 0;
1322 
1323                 lsize = (config1 >> 10) & 7;
1324 
1325                 /* DL == 7 is reserved */
1326                 if (lsize == 7)
1327                         panic("Invalid dcache line size");
1328 
1329                 c->dcache.linesz = lsize ? 2 << lsize : 0;
1330 
1331                 c->dcache.sets = 32 << (((config1 >> 13) + 1) & 7);
1332                 c->dcache.ways = 1 + ((config1 >> 7) & 7);
1333 
1334                 dcache_size = c->dcache.sets *
1335                               c->dcache.ways *
1336                               c->dcache.linesz;
1337                 c->dcache.waybit = __ffs(dcache_size/c->dcache.ways);
1338 
1339                 c->options |= MIPS_CPU_PREFETCH;
1340                 break;
1341         }
1342 
1343         /*
1344          * Processor configuration sanity check for the R4000SC erratum
1345          * #5.  With page sizes larger than 32kB there is no possibility
1346          * to get a VCE exception anymore so we don't care about this
1347          * misconfiguration.  The case is rather theoretical anyway;
1348          * presumably no vendor is shipping his hardware in the "bad"
1349          * configuration.
1350          */
1351         if ((prid & PRID_IMP_MASK) == PRID_IMP_R4000 &&
1352             (prid & PRID_REV_MASK) < PRID_REV_R4400 &&
1353             !(config & CONF_SC) && c->icache.linesz != 16 &&
1354             PAGE_SIZE <= 0x8000)
1355                 panic("Improper R4000SC processor configuration detected");
1356 
1357         /* compute a couple of other cache variables */
1358         c->icache.waysize = icache_size / c->icache.ways;
1359         c->dcache.waysize = dcache_size / c->dcache.ways;
1360 
1361         c->icache.sets = c->icache.linesz ?
1362                 icache_size / (c->icache.linesz * c->icache.ways) : 0;
1363         c->dcache.sets = c->dcache.linesz ?
1364                 dcache_size / (c->dcache.linesz * c->dcache.ways) : 0;
1365 
1366         /*
1367          * R1x000 P-caches are odd in a positive way.  They're 32kB 2-way
1368          * virtually indexed so normally would suffer from aliases.  So
1369          * normally they'd suffer from aliases but magic in the hardware deals
1370          * with that for us so we don't need to take care ourselves.
1371          */
1372         switch (current_cpu_type()) {
1373         case CPU_20KC:
1374         case CPU_25KF:
1375         case CPU_I6400:
1376         case CPU_I6500:
1377         case CPU_SB1:
1378         case CPU_SB1A:
1379         case CPU_XLR:
1380                 c->dcache.flags |= MIPS_CACHE_PINDEX;
1381                 break;
1382 
1383         case CPU_R10000:
1384         case CPU_R12000:
1385         case CPU_R14000:
1386         case CPU_R16000:
1387                 break;
1388 
1389         case CPU_74K:
1390         case CPU_1074K:
1391                 has_74k_erratum = alias_74k_erratum(c);
1392                 /* Fall through. */
1393         case CPU_M14KC:
1394         case CPU_M14KEC:
1395         case CPU_24K:
1396         case CPU_34K:
1397         case CPU_1004K:
1398         case CPU_INTERAPTIV:
1399         case CPU_P5600:
1400         case CPU_PROAPTIV:
1401         case CPU_M5150:
1402         case CPU_QEMU_GENERIC:
1403         case CPU_P6600:
1404         case CPU_M6250:
1405                 if (!(read_c0_config7() & MIPS_CONF7_IAR) &&
1406                     (c->icache.waysize > PAGE_SIZE))
1407                         c->icache.flags |= MIPS_CACHE_ALIASES;
1408                 if (!has_74k_erratum && (read_c0_config7() & MIPS_CONF7_AR)) {
1409                         /*
1410                          * Effectively physically indexed dcache,
1411                          * thus no virtual aliases.
1412                         */
1413                         c->dcache.flags |= MIPS_CACHE_PINDEX;
1414                         break;
1415                 }
1416                 /* fall through */
1417         default:
1418                 if (has_74k_erratum || c->dcache.waysize > PAGE_SIZE)
1419                         c->dcache.flags |= MIPS_CACHE_ALIASES;
1420         }
1421 
1422         /* Physically indexed caches don't suffer from virtual aliasing */
1423         if (c->dcache.flags & MIPS_CACHE_PINDEX)
1424                 c->dcache.flags &= ~MIPS_CACHE_ALIASES;
1425 
1426         /*
1427          * In systems with CM the icache fills from L2 or closer caches, and
1428          * thus sees remote stores without needing to write them back any
1429          * further than that.
1430          */
1431         if (mips_cm_present())
1432                 c->icache.flags |= MIPS_IC_SNOOPS_REMOTE;
1433 
1434         switch (current_cpu_type()) {
1435         case CPU_20KC:
1436                 /*
1437                  * Some older 20Kc chips doesn't have the 'VI' bit in
1438                  * the config register.
1439                  */
1440                 c->icache.flags |= MIPS_CACHE_VTAG;
1441                 break;
1442 
1443         case CPU_ALCHEMY:
1444         case CPU_I6400:
1445         case CPU_I6500:
1446                 c->icache.flags |= MIPS_CACHE_IC_F_DC;
1447                 break;
1448 
1449         case CPU_BMIPS5000:
1450                 c->icache.flags |= MIPS_CACHE_IC_F_DC;
1451                 /* Cache aliases are handled in hardware; allow HIGHMEM */
1452                 c->dcache.flags &= ~MIPS_CACHE_ALIASES;
1453                 break;
1454 
1455         case CPU_LOONGSON2:
1456                 /*
1457                  * LOONGSON2 has 4 way icache, but when using indexed cache op,
1458                  * one op will act on all 4 ways
1459                  */
1460                 c->icache.ways = 1;
1461         }
1462 
1463         printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
1464                icache_size >> 10,
1465                c->icache.flags & MIPS_CACHE_VTAG ? "VIVT" : "VIPT",
1466                way_string[c->icache.ways], c->icache.linesz);
1467 
1468         printk("Primary data cache %ldkB, %s, %s, %s, linesize %d bytes\n",
1469                dcache_size >> 10, way_string[c->dcache.ways],
1470                (c->dcache.flags & MIPS_CACHE_PINDEX) ? "PIPT" : "VIPT",
1471                (c->dcache.flags & MIPS_CACHE_ALIASES) ?
1472                         "cache aliases" : "no aliases",
1473                c->dcache.linesz);
1474 }
1475 
1476 static void probe_vcache(void)
1477 {
1478         struct cpuinfo_mips *c = &current_cpu_data;
1479         unsigned int config2, lsize;
1480 
1481         if (current_cpu_type() != CPU_LOONGSON3)
1482                 return;
1483 
1484         config2 = read_c0_config2();
1485         if ((lsize = ((config2 >> 20) & 15)))
1486                 c->vcache.linesz = 2 << lsize;
1487         else
1488                 c->vcache.linesz = lsize;
1489 
1490         c->vcache.sets = 64 << ((config2 >> 24) & 15);
1491         c->vcache.ways = 1 + ((config2 >> 16) & 15);
1492 
1493         vcache_size = c->vcache.sets * c->vcache.ways * c->vcache.linesz;
1494 
1495         c->vcache.waybit = 0;
1496         c->vcache.waysize = vcache_size / c->vcache.ways;
1497 
1498         pr_info("Unified victim cache %ldkB %s, linesize %d bytes.\n",
1499                 vcache_size >> 10, way_string[c->vcache.ways], c->vcache.linesz);
1500 }
1501 
1502 /*
1503  * If you even _breathe_ on this function, look at the gcc output and make sure
1504  * it does not pop things on and off the stack for the cache sizing loop that
1505  * executes in KSEG1 space or else you will crash and burn badly.  You have
1506  * been warned.
1507  */
1508 static int probe_scache(void)
1509 {
1510         unsigned long flags, addr, begin, end, pow2;
1511         unsigned int config = read_c0_config();
1512         struct cpuinfo_mips *c = &current_cpu_data;
1513 
1514         if (config & CONF_SC)
1515                 return 0;
1516 
1517         begin = (unsigned long) &_stext;
1518         begin &= ~((4 * 1024 * 1024) - 1);
1519         end = begin + (4 * 1024 * 1024);
1520 
1521         /*
1522          * This is such a bitch, you'd think they would make it easy to do
1523          * this.  Away you daemons of stupidity!
1524          */
1525         local_irq_save(flags);
1526 
1527         /* Fill each size-multiple cache line with a valid tag. */
1528         pow2 = (64 * 1024);
1529         for (addr = begin; addr < end; addr = (begin + pow2)) {
1530                 unsigned long *p = (unsigned long *) addr;
1531                 __asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
1532                 pow2 <<= 1;
1533         }
1534 
1535         /* Load first line with zero (therefore invalid) tag. */
1536         write_c0_taglo(0);
1537         write_c0_taghi(0);
1538         __asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
1539         cache_op(Index_Store_Tag_I, begin);
1540         cache_op(Index_Store_Tag_D, begin);
1541         cache_op(Index_Store_Tag_SD, begin);
1542 
1543         /* Now search for the wrap around point. */
1544         pow2 = (128 * 1024);
1545         for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) {
1546                 cache_op(Index_Load_Tag_SD, addr);
1547                 __asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
1548                 if (!read_c0_taglo())
1549                         break;
1550                 pow2 <<= 1;
1551         }
1552         local_irq_restore(flags);
1553         addr -= begin;
1554 
1555         scache_size = addr;
1556         c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22);
1557         c->scache.ways = 1;
1558         c->scache.waybit = 0;           /* does not matter */
1559 
1560         return 1;
1561 }
1562 
1563 static void __init loongson2_sc_init(void)
1564 {
1565         struct cpuinfo_mips *c = &current_cpu_data;
1566 
1567         scache_size = 512*1024;
1568         c->scache.linesz = 32;
1569         c->scache.ways = 4;
1570         c->scache.waybit = 0;
1571         c->scache.waysize = scache_size / (c->scache.ways);
1572         c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1573         pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1574                scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1575 
1576         c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1577 }
1578 
1579 static void __init loongson3_sc_init(void)
1580 {
1581         struct cpuinfo_mips *c = &current_cpu_data;
1582         unsigned int config2, lsize;
1583 
1584         config2 = read_c0_config2();
1585         lsize = (config2 >> 4) & 15;
1586         if (lsize)
1587                 c->scache.linesz = 2 << lsize;
1588         else
1589                 c->scache.linesz = 0;
1590         c->scache.sets = 64 << ((config2 >> 8) & 15);
1591         c->scache.ways = 1 + (config2 & 15);
1592 
1593         scache_size = c->scache.sets *
1594                                   c->scache.ways *
1595                                   c->scache.linesz;
1596         /* Loongson-3 has 4 cores, 1MB scache for each. scaches are shared */
1597         scache_size *= 4;
1598         c->scache.waybit = 0;
1599         c->scache.waysize = scache_size / c->scache.ways;
1600         pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1601                scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1602         if (scache_size)
1603                 c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1604         return;
1605 }
1606 
1607 extern int r5k_sc_init(void);
1608 extern int rm7k_sc_init(void);
1609 extern int mips_sc_init(void);
1610 
1611 static void setup_scache(void)
1612 {
1613         struct cpuinfo_mips *c = &current_cpu_data;
1614         unsigned int config = read_c0_config();
1615         int sc_present = 0;
1616 
1617         /*
1618          * Do the probing thing on R4000SC and R4400SC processors.  Other
1619          * processors don't have a S-cache that would be relevant to the
1620          * Linux memory management.
1621          */
1622         switch (current_cpu_type()) {
1623         case CPU_R4000SC:
1624         case CPU_R4000MC:
1625         case CPU_R4400SC:
1626         case CPU_R4400MC:
1627                 sc_present = run_uncached(probe_scache);
1628                 if (sc_present)
1629                         c->options |= MIPS_CPU_CACHE_CDEX_S;
1630                 break;
1631 
1632         case CPU_R10000:
1633         case CPU_R12000:
1634         case CPU_R14000:
1635         case CPU_R16000:
1636                 scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16);
1637                 c->scache.linesz = 64 << ((config >> 13) & 1);
1638                 c->scache.ways = 2;
1639                 c->scache.waybit= 0;
1640                 sc_present = 1;
1641                 break;
1642 
1643         case CPU_R5000:
1644         case CPU_NEVADA:
1645 #ifdef CONFIG_R5000_CPU_SCACHE
1646                 r5k_sc_init();
1647 #endif
1648                 return;
1649 
1650         case CPU_RM7000:
1651 #ifdef CONFIG_RM7000_CPU_SCACHE
1652                 rm7k_sc_init();
1653 #endif
1654                 return;
1655 
1656         case CPU_LOONGSON2:
1657                 loongson2_sc_init();
1658                 return;
1659 
1660         case CPU_LOONGSON3:
1661                 loongson3_sc_init();
1662                 return;
1663 
1664         case CPU_CAVIUM_OCTEON3:
1665         case CPU_XLP:
1666                 /* don't need to worry about L2, fully coherent */
1667                 return;
1668 
1669         default:
1670                 if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M32R2 |
1671                                     MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R1 |
1672                                     MIPS_CPU_ISA_M64R2 | MIPS_CPU_ISA_M64R6)) {
1673 #ifdef CONFIG_MIPS_CPU_SCACHE
1674                         if (mips_sc_init ()) {
1675                                 scache_size = c->scache.ways * c->scache.sets * c->scache.linesz;
1676                                 printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n",
1677                                        scache_size >> 10,
1678                                        way_string[c->scache.ways], c->scache.linesz);
1679                         }
1680 #else
1681                         if (!(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
1682                                 panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
1683 #endif
1684                         return;
1685                 }
1686                 sc_present = 0;
1687         }
1688 
1689         if (!sc_present)
1690                 return;
1691 
1692         /* compute a couple of other cache variables */
1693         c->scache.waysize = scache_size / c->scache.ways;
1694 
1695         c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1696 
1697         printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1698                scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1699 
1700         c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1701 }
1702 
1703 void au1x00_fixup_config_od(void)
1704 {
1705         /*
1706          * c0_config.od (bit 19) was write only (and read as 0)
1707          * on the early revisions of Alchemy SOCs.  It disables the bus
1708          * transaction overlapping and needs to be set to fix various errata.
1709          */
1710         switch (read_c0_prid()) {
1711         case 0x00030100: /* Au1000 DA */
1712         case 0x00030201: /* Au1000 HA */
1713         case 0x00030202: /* Au1000 HB */
1714         case 0x01030200: /* Au1500 AB */
1715         /*
1716          * Au1100 errata actually keeps silence about this bit, so we set it
1717          * just in case for those revisions that require it to be set according
1718          * to the (now gone) cpu table.
1719          */
1720         case 0x02030200: /* Au1100 AB */
1721         case 0x02030201: /* Au1100 BA */
1722         case 0x02030202: /* Au1100 BC */
1723                 set_c0_config(1 << 19);
1724                 break;
1725         }
1726 }
1727 
1728 /* CP0 hazard avoidance. */
1729 #define NXP_BARRIER()                                                   \
1730          __asm__ __volatile__(                                          \
1731         ".set noreorder\n\t"                                            \
1732         "nop; nop; nop; nop; nop; nop;\n\t"                             \
1733         ".set reorder\n\t")
1734 
1735 static void nxp_pr4450_fixup_config(void)
1736 {
1737         unsigned long config0;
1738 
1739         config0 = read_c0_config();
1740 
1741         /* clear all three cache coherency fields */
1742         config0 &= ~(0x7 | (7 << 25) | (7 << 28));
1743         config0 |= (((_page_cachable_default >> _CACHE_SHIFT) <<  0) |
1744                     ((_page_cachable_default >> _CACHE_SHIFT) << 25) |
1745                     ((_page_cachable_default >> _CACHE_SHIFT) << 28));
1746         write_c0_config(config0);
1747         NXP_BARRIER();
1748 }
1749 
1750 static int cca = -1;
1751 
1752 static int __init cca_setup(char *str)
1753 {
1754         get_option(&str, &cca);
1755 
1756         return 0;
1757 }
1758 
1759 early_param("cca", cca_setup);
1760 
1761 static void coherency_setup(void)
1762 {
1763         if (cca < 0 || cca > 7)
1764                 cca = read_c0_config() & CONF_CM_CMASK;
1765         _page_cachable_default = cca << _CACHE_SHIFT;
1766 
1767         pr_debug("Using cache attribute %d\n", cca);
1768         change_c0_config(CONF_CM_CMASK, cca);
1769 
1770         /*
1771          * c0_status.cu=0 specifies that updates by the sc instruction use
1772          * the coherency mode specified by the TLB; 1 means cachable
1773          * coherent update on write will be used.  Not all processors have
1774          * this bit and; some wire it to zero, others like Toshiba had the
1775          * silly idea of putting something else there ...
1776          */
1777         switch (current_cpu_type()) {
1778         case CPU_R4000PC:
1779         case CPU_R4000SC:
1780         case CPU_R4000MC:
1781         case CPU_R4400PC:
1782         case CPU_R4400SC:
1783         case CPU_R4400MC:
1784                 clear_c0_config(CONF_CU);
1785                 break;
1786         /*
1787          * We need to catch the early Alchemy SOCs with
1788          * the write-only co_config.od bit and set it back to one on:
1789          * Au1000 rev DA, HA, HB;  Au1100 AB, BA, BC, Au1500 AB
1790          */
1791         case CPU_ALCHEMY:
1792                 au1x00_fixup_config_od();
1793                 break;
1794 
1795         case PRID_IMP_PR4450:
1796                 nxp_pr4450_fixup_config();
1797                 break;
1798         }
1799 }
1800 
1801 static void r4k_cache_error_setup(void)
1802 {
1803         extern char __weak except_vec2_generic;
1804         extern char __weak except_vec2_sb1;
1805 
1806         switch (current_cpu_type()) {
1807         case CPU_SB1:
1808         case CPU_SB1A:
1809                 set_uncached_handler(0x100, &except_vec2_sb1, 0x80);
1810                 break;
1811 
1812         default:
1813                 set_uncached_handler(0x100, &except_vec2_generic, 0x80);
1814                 break;
1815         }
1816 }
1817 
1818 void r4k_cache_init(void)
1819 {
1820         extern void build_clear_page(void);
1821         extern void build_copy_page(void);
1822         struct cpuinfo_mips *c = &current_cpu_data;
1823 
1824         probe_pcache();
1825         probe_vcache();
1826         setup_scache();
1827 
1828         r4k_blast_dcache_page_setup();
1829         r4k_blast_dcache_page_indexed_setup();
1830         r4k_blast_dcache_setup();
1831         r4k_blast_icache_page_setup();
1832         r4k_blast_icache_page_indexed_setup();
1833         r4k_blast_icache_setup();
1834         r4k_blast_scache_page_setup();
1835         r4k_blast_scache_page_indexed_setup();
1836         r4k_blast_scache_setup();
1837         r4k_blast_scache_node_setup();
1838 #ifdef CONFIG_EVA
1839         r4k_blast_dcache_user_page_setup();
1840         r4k_blast_icache_user_page_setup();
1841 #endif
1842 
1843         /*
1844          * Some MIPS32 and MIPS64 processors have physically indexed caches.
1845          * This code supports virtually indexed processors and will be
1846          * unnecessarily inefficient on physically indexed processors.
1847          */
1848         if (c->dcache.linesz && cpu_has_dc_aliases)
1849                 shm_align_mask = max_t( unsigned long,
1850                                         c->dcache.sets * c->dcache.linesz - 1,
1851                                         PAGE_SIZE - 1);
1852         else
1853                 shm_align_mask = PAGE_SIZE-1;
1854 
1855         __flush_cache_vmap      = r4k__flush_cache_vmap;
1856         __flush_cache_vunmap    = r4k__flush_cache_vunmap;
1857 
1858         flush_cache_all         = cache_noop;
1859         __flush_cache_all       = r4k___flush_cache_all;
1860         flush_cache_mm          = r4k_flush_cache_mm;
1861         flush_cache_page        = r4k_flush_cache_page;
1862         flush_cache_range       = r4k_flush_cache_range;
1863 
1864         __flush_kernel_vmap_range = r4k_flush_kernel_vmap_range;
1865 
1866         flush_icache_all        = r4k_flush_icache_all;
1867         local_flush_data_cache_page     = local_r4k_flush_data_cache_page;
1868         flush_data_cache_page   = r4k_flush_data_cache_page;
1869         flush_icache_range      = r4k_flush_icache_range;
1870         local_flush_icache_range        = local_r4k_flush_icache_range;
1871         __flush_icache_user_range       = r4k_flush_icache_user_range;
1872         __local_flush_icache_user_range = local_r4k_flush_icache_user_range;
1873 
1874 #ifdef CONFIG_DMA_NONCOHERENT
1875 #ifdef CONFIG_DMA_MAYBE_COHERENT
1876         if (coherentio == IO_COHERENCE_ENABLED ||
1877             (coherentio == IO_COHERENCE_DEFAULT && hw_coherentio)) {
1878                 _dma_cache_wback_inv    = (void *)cache_noop;
1879                 _dma_cache_wback        = (void *)cache_noop;
1880                 _dma_cache_inv          = (void *)cache_noop;
1881         } else
1882 #endif /* CONFIG_DMA_MAYBE_COHERENT */
1883         {
1884                 _dma_cache_wback_inv    = r4k_dma_cache_wback_inv;
1885                 _dma_cache_wback        = r4k_dma_cache_wback_inv;
1886                 _dma_cache_inv          = r4k_dma_cache_inv;
1887         }
1888 #endif /* CONFIG_DMA_NONCOHERENT */
1889 
1890         build_clear_page();
1891         build_copy_page();
1892 
1893         /*
1894          * We want to run CMP kernels on core with and without coherent
1895          * caches. Therefore, do not use CONFIG_MIPS_CMP to decide whether
1896          * or not to flush caches.
1897          */
1898         local_r4k___flush_cache_all(NULL);
1899 
1900         coherency_setup();
1901         board_cache_error_setup = r4k_cache_error_setup;
1902 
1903         /*
1904          * Per-CPU overrides
1905          */
1906         switch (current_cpu_type()) {
1907         case CPU_BMIPS4350:
1908         case CPU_BMIPS4380:
1909                 /* No IPI is needed because all CPUs share the same D$ */
1910                 flush_data_cache_page = r4k_blast_dcache_page;
1911                 break;
1912         case CPU_BMIPS5000:
1913                 /* We lose our superpowers if L2 is disabled */
1914                 if (c->scache.flags & MIPS_CACHE_NOT_PRESENT)
1915                         break;
1916 
1917                 /* I$ fills from D$ just by emptying the write buffers */
1918                 flush_cache_page = (void *)b5k_instruction_hazard;
1919                 flush_cache_range = (void *)b5k_instruction_hazard;
1920                 local_flush_data_cache_page = (void *)b5k_instruction_hazard;
1921                 flush_data_cache_page = (void *)b5k_instruction_hazard;
1922                 flush_icache_range = (void *)b5k_instruction_hazard;
1923                 local_flush_icache_range = (void *)b5k_instruction_hazard;
1924 
1925 
1926                 /* Optimization: an L2 flush implicitly flushes the L1 */
1927                 current_cpu_data.options |= MIPS_CPU_INCLUSIVE_CACHES;
1928                 break;
1929         case CPU_LOONGSON3:
1930                 /* Loongson-3 maintains cache coherency by hardware */
1931                 __flush_cache_all       = cache_noop;
1932                 __flush_cache_vmap      = cache_noop;
1933                 __flush_cache_vunmap    = cache_noop;
1934                 __flush_kernel_vmap_range = (void *)cache_noop;
1935                 flush_cache_mm          = (void *)cache_noop;
1936                 flush_cache_page        = (void *)cache_noop;
1937                 flush_cache_range       = (void *)cache_noop;
1938                 flush_icache_all        = (void *)cache_noop;
1939                 flush_data_cache_page   = (void *)cache_noop;
1940                 local_flush_data_cache_page     = (void *)cache_noop;
1941                 break;
1942         }
1943 }
1944 
1945 static int r4k_cache_pm_notifier(struct notifier_block *self, unsigned long cmd,
1946                                void *v)
1947 {
1948         switch (cmd) {
1949         case CPU_PM_ENTER_FAILED:
1950         case CPU_PM_EXIT:
1951                 coherency_setup();
1952                 break;
1953         }
1954 
1955         return NOTIFY_OK;
1956 }
1957 
1958 static struct notifier_block r4k_cache_pm_notifier_block = {
1959         .notifier_call = r4k_cache_pm_notifier,
1960 };
1961 
1962 int __init r4k_cache_init_pm(void)
1963 {
1964         return cpu_pm_register_notifier(&r4k_cache_pm_notifier_block);
1965 }
1966 arch_initcall(r4k_cache_init_pm);