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/hardirq.h>
11 #include <linux/init.h>
12 #include <linux/highmem.h>
13 #include <linux/kernel.h>
14 #include <linux/linkage.h>
15 #include <linux/sched.h>
16 #include <linux/smp.h>
17 #include <linux/mm.h>
18 #include <linux/module.h>
19 #include <linux/bitops.h>
20
21 #include <asm/bcache.h>
22 #include <asm/bootinfo.h>
23 #include <asm/cache.h>
24 #include <asm/cacheops.h>
25 #include <asm/cpu.h>
26 #include <asm/cpu-features.h>
27 #include <asm/io.h>
28 #include <asm/page.h>
29 #include <asm/pgtable.h>
30 #include <asm/r4kcache.h>
31 #include <asm/sections.h>
32 #include <asm/mmu_context.h>
33 #include <asm/war.h>
34 #include <asm/cacheflush.h> /* for run_uncached() */
35
36
37 /*
38 * Special Variant of smp_call_function for use by cache functions:
39 *
40 * o No return value
41 * o collapses to normal function call on UP kernels
42 * o collapses to normal function call on systems with a single shared
43 * primary cache.
44 * o doesn't disable interrupts on the local CPU
45 */
r4k_on_each_cpu(void (* func)(void * info),void * info)46 static inline void r4k_on_each_cpu(void (*func) (void *info), void *info)
47 {
48 preempt_disable();
49
50 #if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC)
51 smp_call_function(func, info, 1);
52 #endif
53 func(info);
54 preempt_enable();
55 }
56
57 #if defined(CONFIG_MIPS_CMP)
58 #define cpu_has_safe_index_cacheops 0
59 #else
60 #define cpu_has_safe_index_cacheops 1
61 #endif
62
63 /*
64 * Must die.
65 */
66 static unsigned long icache_size __read_mostly;
67 static unsigned long dcache_size __read_mostly;
68 static unsigned long scache_size __read_mostly;
69
70 /*
71 * Dummy cache handling routines for machines without boardcaches
72 */
cache_noop(void)73 static void cache_noop(void) {}
74
75 static struct bcache_ops no_sc_ops = {
76 .bc_enable = (void *)cache_noop,
77 .bc_disable = (void *)cache_noop,
78 .bc_wback_inv = (void *)cache_noop,
79 .bc_inv = (void *)cache_noop
80 };
81
82 struct bcache_ops *bcops = &no_sc_ops;
83
84 #define cpu_is_r4600_v1_x() ((read_c0_prid() & 0xfffffff0) == 0x00002010)
85 #define cpu_is_r4600_v2_x() ((read_c0_prid() & 0xfffffff0) == 0x00002020)
86
87 #define R4600_HIT_CACHEOP_WAR_IMPL \
88 do { \
89 if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x()) \
90 *(volatile unsigned long *)CKSEG1; \
91 if (R4600_V1_HIT_CACHEOP_WAR) \
92 __asm__ __volatile__("nop;nop;nop;nop"); \
93 } while (0)
94
95 static void (*r4k_blast_dcache_page)(unsigned long addr);
96
r4k_blast_dcache_page_dc32(unsigned long addr)97 static inline void r4k_blast_dcache_page_dc32(unsigned long addr)
98 {
99 R4600_HIT_CACHEOP_WAR_IMPL;
100 blast_dcache32_page(addr);
101 }
102
r4k_blast_dcache_page_dc64(unsigned long addr)103 static inline void r4k_blast_dcache_page_dc64(unsigned long addr)
104 {
105 R4600_HIT_CACHEOP_WAR_IMPL;
106 blast_dcache64_page(addr);
107 }
108
r4k_blast_dcache_page_setup(void)109 static void __cpuinit r4k_blast_dcache_page_setup(void)
110 {
111 unsigned long dc_lsize = cpu_dcache_line_size();
112
113 if (dc_lsize == 0)
114 r4k_blast_dcache_page = (void *)cache_noop;
115 else if (dc_lsize == 16)
116 r4k_blast_dcache_page = blast_dcache16_page;
117 else if (dc_lsize == 32)
118 r4k_blast_dcache_page = r4k_blast_dcache_page_dc32;
119 else if (dc_lsize == 64)
120 r4k_blast_dcache_page = r4k_blast_dcache_page_dc64;
121 }
122
123 static void (* r4k_blast_dcache_page_indexed)(unsigned long addr);
124
r4k_blast_dcache_page_indexed_setup(void)125 static void __cpuinit r4k_blast_dcache_page_indexed_setup(void)
126 {
127 unsigned long dc_lsize = cpu_dcache_line_size();
128
129 if (dc_lsize == 0)
130 r4k_blast_dcache_page_indexed = (void *)cache_noop;
131 else if (dc_lsize == 16)
132 r4k_blast_dcache_page_indexed = blast_dcache16_page_indexed;
133 else if (dc_lsize == 32)
134 r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed;
135 else if (dc_lsize == 64)
136 r4k_blast_dcache_page_indexed = blast_dcache64_page_indexed;
137 }
138
139 static void (* r4k_blast_dcache)(void);
140
r4k_blast_dcache_setup(void)141 static void __cpuinit r4k_blast_dcache_setup(void)
142 {
143 unsigned long dc_lsize = cpu_dcache_line_size();
144
145 if (dc_lsize == 0)
146 r4k_blast_dcache = (void *)cache_noop;
147 else if (dc_lsize == 16)
148 r4k_blast_dcache = blast_dcache16;
149 else if (dc_lsize == 32)
150 r4k_blast_dcache = blast_dcache32;
151 else if (dc_lsize == 64)
152 r4k_blast_dcache = blast_dcache64;
153 }
154
155 /* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
156 #define JUMP_TO_ALIGN(order) \
157 __asm__ __volatile__( \
158 "b\t1f\n\t" \
159 ".align\t" #order "\n\t" \
160 "1:\n\t" \
161 )
162 #define CACHE32_UNROLL32_ALIGN JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
163 #define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
164
blast_r4600_v1_icache32(void)165 static inline void blast_r4600_v1_icache32(void)
166 {
167 unsigned long flags;
168
169 local_irq_save(flags);
170 blast_icache32();
171 local_irq_restore(flags);
172 }
173
tx49_blast_icache32(void)174 static inline void tx49_blast_icache32(void)
175 {
176 unsigned long start = INDEX_BASE;
177 unsigned long end = start + current_cpu_data.icache.waysize;
178 unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
179 unsigned long ws_end = current_cpu_data.icache.ways <<
180 current_cpu_data.icache.waybit;
181 unsigned long ws, addr;
182
183 CACHE32_UNROLL32_ALIGN2;
184 /* I'm in even chunk. blast odd chunks */
185 for (ws = 0; ws < ws_end; ws += ws_inc)
186 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
187 cache32_unroll32(addr|ws, Index_Invalidate_I);
188 CACHE32_UNROLL32_ALIGN;
189 /* I'm in odd chunk. blast even chunks */
190 for (ws = 0; ws < ws_end; ws += ws_inc)
191 for (addr = start; addr < end; addr += 0x400 * 2)
192 cache32_unroll32(addr|ws, Index_Invalidate_I);
193 }
194
blast_icache32_r4600_v1_page_indexed(unsigned long page)195 static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page)
196 {
197 unsigned long flags;
198
199 local_irq_save(flags);
200 blast_icache32_page_indexed(page);
201 local_irq_restore(flags);
202 }
203
tx49_blast_icache32_page_indexed(unsigned long page)204 static inline void tx49_blast_icache32_page_indexed(unsigned long page)
205 {
206 unsigned long indexmask = current_cpu_data.icache.waysize - 1;
207 unsigned long start = INDEX_BASE + (page & indexmask);
208 unsigned long end = start + PAGE_SIZE;
209 unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
210 unsigned long ws_end = current_cpu_data.icache.ways <<
211 current_cpu_data.icache.waybit;
212 unsigned long ws, addr;
213
214 CACHE32_UNROLL32_ALIGN2;
215 /* I'm in even chunk. blast odd chunks */
216 for (ws = 0; ws < ws_end; ws += ws_inc)
217 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
218 cache32_unroll32(addr|ws, Index_Invalidate_I);
219 CACHE32_UNROLL32_ALIGN;
220 /* I'm in odd chunk. blast even chunks */
221 for (ws = 0; ws < ws_end; ws += ws_inc)
222 for (addr = start; addr < end; addr += 0x400 * 2)
223 cache32_unroll32(addr|ws, Index_Invalidate_I);
224 }
225
226 static void (* r4k_blast_icache_page)(unsigned long addr);
227
r4k_blast_icache_page_setup(void)228 static void __cpuinit r4k_blast_icache_page_setup(void)
229 {
230 unsigned long ic_lsize = cpu_icache_line_size();
231
232 if (ic_lsize == 0)
233 r4k_blast_icache_page = (void *)cache_noop;
234 else if (ic_lsize == 16)
235 r4k_blast_icache_page = blast_icache16_page;
236 else if (ic_lsize == 32)
237 r4k_blast_icache_page = blast_icache32_page;
238 else if (ic_lsize == 64)
239 r4k_blast_icache_page = blast_icache64_page;
240 }
241
242
243 static void (* r4k_blast_icache_page_indexed)(unsigned long addr);
244
r4k_blast_icache_page_indexed_setup(void)245 static void __cpuinit r4k_blast_icache_page_indexed_setup(void)
246 {
247 unsigned long ic_lsize = cpu_icache_line_size();
248
249 if (ic_lsize == 0)
250 r4k_blast_icache_page_indexed = (void *)cache_noop;
251 else if (ic_lsize == 16)
252 r4k_blast_icache_page_indexed = blast_icache16_page_indexed;
253 else if (ic_lsize == 32) {
254 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
255 r4k_blast_icache_page_indexed =
256 blast_icache32_r4600_v1_page_indexed;
257 else if (TX49XX_ICACHE_INDEX_INV_WAR)
258 r4k_blast_icache_page_indexed =
259 tx49_blast_icache32_page_indexed;
260 else
261 r4k_blast_icache_page_indexed =
262 blast_icache32_page_indexed;
263 } else if (ic_lsize == 64)
264 r4k_blast_icache_page_indexed = blast_icache64_page_indexed;
265 }
266
267 static void (* r4k_blast_icache)(void);
268
r4k_blast_icache_setup(void)269 static void __cpuinit r4k_blast_icache_setup(void)
270 {
271 unsigned long ic_lsize = cpu_icache_line_size();
272
273 if (ic_lsize == 0)
274 r4k_blast_icache = (void *)cache_noop;
275 else if (ic_lsize == 16)
276 r4k_blast_icache = blast_icache16;
277 else if (ic_lsize == 32) {
278 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
279 r4k_blast_icache = blast_r4600_v1_icache32;
280 else if (TX49XX_ICACHE_INDEX_INV_WAR)
281 r4k_blast_icache = tx49_blast_icache32;
282 else
283 r4k_blast_icache = blast_icache32;
284 } else if (ic_lsize == 64)
285 r4k_blast_icache = blast_icache64;
286 }
287
288 static void (* r4k_blast_scache_page)(unsigned long addr);
289
r4k_blast_scache_page_setup(void)290 static void __cpuinit r4k_blast_scache_page_setup(void)
291 {
292 unsigned long sc_lsize = cpu_scache_line_size();
293
294 if (scache_size == 0)
295 r4k_blast_scache_page = (void *)cache_noop;
296 else if (sc_lsize == 16)
297 r4k_blast_scache_page = blast_scache16_page;
298 else if (sc_lsize == 32)
299 r4k_blast_scache_page = blast_scache32_page;
300 else if (sc_lsize == 64)
301 r4k_blast_scache_page = blast_scache64_page;
302 else if (sc_lsize == 128)
303 r4k_blast_scache_page = blast_scache128_page;
304 }
305
306 static void (* r4k_blast_scache_page_indexed)(unsigned long addr);
307
r4k_blast_scache_page_indexed_setup(void)308 static void __cpuinit r4k_blast_scache_page_indexed_setup(void)
309 {
310 unsigned long sc_lsize = cpu_scache_line_size();
311
312 if (scache_size == 0)
313 r4k_blast_scache_page_indexed = (void *)cache_noop;
314 else if (sc_lsize == 16)
315 r4k_blast_scache_page_indexed = blast_scache16_page_indexed;
316 else if (sc_lsize == 32)
317 r4k_blast_scache_page_indexed = blast_scache32_page_indexed;
318 else if (sc_lsize == 64)
319 r4k_blast_scache_page_indexed = blast_scache64_page_indexed;
320 else if (sc_lsize == 128)
321 r4k_blast_scache_page_indexed = blast_scache128_page_indexed;
322 }
323
324 static void (* r4k_blast_scache)(void);
325
r4k_blast_scache_setup(void)326 static void __cpuinit r4k_blast_scache_setup(void)
327 {
328 unsigned long sc_lsize = cpu_scache_line_size();
329
330 if (scache_size == 0)
331 r4k_blast_scache = (void *)cache_noop;
332 else if (sc_lsize == 16)
333 r4k_blast_scache = blast_scache16;
334 else if (sc_lsize == 32)
335 r4k_blast_scache = blast_scache32;
336 else if (sc_lsize == 64)
337 r4k_blast_scache = blast_scache64;
338 else if (sc_lsize == 128)
339 r4k_blast_scache = blast_scache128;
340 }
341
local_r4k___flush_cache_all(void * args)342 static inline void local_r4k___flush_cache_all(void * args)
343 {
344 #if defined(CONFIG_CPU_LOONGSON2)
345 r4k_blast_scache();
346 return;
347 #endif
348 r4k_blast_dcache();
349 r4k_blast_icache();
350
351 switch (current_cpu_type()) {
352 case CPU_R4000SC:
353 case CPU_R4000MC:
354 case CPU_R4400SC:
355 case CPU_R4400MC:
356 case CPU_R10000:
357 case CPU_R12000:
358 case CPU_R14000:
359 r4k_blast_scache();
360 }
361 }
362
r4k___flush_cache_all(void)363 static void r4k___flush_cache_all(void)
364 {
365 r4k_on_each_cpu(local_r4k___flush_cache_all, NULL);
366 }
367
has_valid_asid(const struct mm_struct * mm)368 static inline int has_valid_asid(const struct mm_struct *mm)
369 {
370 #if defined(CONFIG_MIPS_MT_SMP) || defined(CONFIG_MIPS_MT_SMTC)
371 int i;
372
373 for_each_online_cpu(i)
374 if (cpu_context(i, mm))
375 return 1;
376
377 return 0;
378 #else
379 return cpu_context(smp_processor_id(), mm);
380 #endif
381 }
382
r4k__flush_cache_vmap(void)383 static void r4k__flush_cache_vmap(void)
384 {
385 r4k_blast_dcache();
386 }
387
r4k__flush_cache_vunmap(void)388 static void r4k__flush_cache_vunmap(void)
389 {
390 r4k_blast_dcache();
391 }
392
local_r4k_flush_cache_range(void * args)393 static inline void local_r4k_flush_cache_range(void * args)
394 {
395 struct vm_area_struct *vma = args;
396 int exec = vma->vm_flags & VM_EXEC;
397
398 if (!(has_valid_asid(vma->vm_mm)))
399 return;
400
401 r4k_blast_dcache();
402 if (exec)
403 r4k_blast_icache();
404 }
405
r4k_flush_cache_range(struct vm_area_struct * vma,unsigned long start,unsigned long end)406 static void r4k_flush_cache_range(struct vm_area_struct *vma,
407 unsigned long start, unsigned long end)
408 {
409 int exec = vma->vm_flags & VM_EXEC;
410
411 if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc))
412 r4k_on_each_cpu(local_r4k_flush_cache_range, vma);
413 }
414
local_r4k_flush_cache_mm(void * args)415 static inline void local_r4k_flush_cache_mm(void * args)
416 {
417 struct mm_struct *mm = args;
418
419 if (!has_valid_asid(mm))
420 return;
421
422 /*
423 * Kludge alert. For obscure reasons R4000SC and R4400SC go nuts if we
424 * only flush the primary caches but R10000 and R12000 behave sane ...
425 * R4000SC and R4400SC indexed S-cache ops also invalidate primary
426 * caches, so we can bail out early.
427 */
428 if (current_cpu_type() == CPU_R4000SC ||
429 current_cpu_type() == CPU_R4000MC ||
430 current_cpu_type() == CPU_R4400SC ||
431 current_cpu_type() == CPU_R4400MC) {
432 r4k_blast_scache();
433 return;
434 }
435
436 r4k_blast_dcache();
437 }
438
r4k_flush_cache_mm(struct mm_struct * mm)439 static void r4k_flush_cache_mm(struct mm_struct *mm)
440 {
441 if (!cpu_has_dc_aliases)
442 return;
443
444 r4k_on_each_cpu(local_r4k_flush_cache_mm, mm);
445 }
446
447 struct flush_cache_page_args {
448 struct vm_area_struct *vma;
449 unsigned long addr;
450 unsigned long pfn;
451 };
452
local_r4k_flush_cache_page(void * args)453 static inline void local_r4k_flush_cache_page(void *args)
454 {
455 struct flush_cache_page_args *fcp_args = args;
456 struct vm_area_struct *vma = fcp_args->vma;
457 unsigned long addr = fcp_args->addr;
458 struct page *page = pfn_to_page(fcp_args->pfn);
459 int exec = vma->vm_flags & VM_EXEC;
460 struct mm_struct *mm = vma->vm_mm;
461 int map_coherent = 0;
462 pgd_t *pgdp;
463 pud_t *pudp;
464 pmd_t *pmdp;
465 pte_t *ptep;
466 void *vaddr;
467
468 /*
469 * If ownes no valid ASID yet, cannot possibly have gotten
470 * this page into the cache.
471 */
472 if (!has_valid_asid(mm))
473 return;
474
475 addr &= PAGE_MASK;
476 pgdp = pgd_offset(mm, addr);
477 pudp = pud_offset(pgdp, addr);
478 pmdp = pmd_offset(pudp, addr);
479 ptep = pte_offset(pmdp, addr);
480
481 /*
482 * If the page isn't marked valid, the page cannot possibly be
483 * in the cache.
484 */
485 if (!(pte_present(*ptep)))
486 return;
487
488 if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID))
489 vaddr = NULL;
490 else {
491 /*
492 * Use kmap_coherent or kmap_atomic to do flushes for
493 * another ASID than the current one.
494 */
495 map_coherent = (cpu_has_dc_aliases &&
496 page_mapped(page) && !Page_dcache_dirty(page));
497 if (map_coherent)
498 vaddr = kmap_coherent(page, addr);
499 else
500 vaddr = kmap_atomic(page);
501 addr = (unsigned long)vaddr;
502 }
503
504 if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
505 r4k_blast_dcache_page(addr);
506 if (exec && !cpu_icache_snoops_remote_store)
507 r4k_blast_scache_page(addr);
508 }
509 if (exec) {
510 if (vaddr && cpu_has_vtag_icache && mm == current->active_mm) {
511 int cpu = smp_processor_id();
512
513 if (cpu_context(cpu, mm) != 0)
514 drop_mmu_context(mm, cpu);
515 } else
516 r4k_blast_icache_page(addr);
517 }
518
519 if (vaddr) {
520 if (map_coherent)
521 kunmap_coherent();
522 else
523 kunmap_atomic(vaddr);
524 }
525 }
526
r4k_flush_cache_page(struct vm_area_struct * vma,unsigned long addr,unsigned long pfn)527 static void r4k_flush_cache_page(struct vm_area_struct *vma,
528 unsigned long addr, unsigned long pfn)
529 {
530 struct flush_cache_page_args args;
531
532 args.vma = vma;
533 args.addr = addr;
534 args.pfn = pfn;
535
536 r4k_on_each_cpu(local_r4k_flush_cache_page, &args);
537 }
538
local_r4k_flush_data_cache_page(void * addr)539 static inline void local_r4k_flush_data_cache_page(void * addr)
540 {
541 r4k_blast_dcache_page((unsigned long) addr);
542 }
543
r4k_flush_data_cache_page(unsigned long addr)544 static void r4k_flush_data_cache_page(unsigned long addr)
545 {
546 if (in_atomic())
547 local_r4k_flush_data_cache_page((void *)addr);
548 else
549 r4k_on_each_cpu(local_r4k_flush_data_cache_page, (void *) addr);
550 }
551
552 struct flush_icache_range_args {
553 unsigned long start;
554 unsigned long end;
555 };
556
local_r4k_flush_icache_range(unsigned long start,unsigned long end)557 static inline void local_r4k_flush_icache_range(unsigned long start, unsigned long end)
558 {
559 if (!cpu_has_ic_fills_f_dc) {
560 if (end - start >= dcache_size) {
561 r4k_blast_dcache();
562 } else {
563 R4600_HIT_CACHEOP_WAR_IMPL;
564 protected_blast_dcache_range(start, end);
565 }
566 }
567
568 if (end - start > icache_size)
569 r4k_blast_icache();
570 else
571 protected_blast_icache_range(start, end);
572 }
573
local_r4k_flush_icache_range_ipi(void * args)574 static inline void local_r4k_flush_icache_range_ipi(void *args)
575 {
576 struct flush_icache_range_args *fir_args = args;
577 unsigned long start = fir_args->start;
578 unsigned long end = fir_args->end;
579
580 local_r4k_flush_icache_range(start, end);
581 }
582
r4k_flush_icache_range(unsigned long start,unsigned long end)583 static void r4k_flush_icache_range(unsigned long start, unsigned long end)
584 {
585 struct flush_icache_range_args args;
586
587 args.start = start;
588 args.end = end;
589
590 r4k_on_each_cpu(local_r4k_flush_icache_range_ipi, &args);
591 instruction_hazard();
592 }
593
594 #ifdef CONFIG_DMA_NONCOHERENT
595
r4k_dma_cache_wback_inv(unsigned long addr,unsigned long size)596 static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
597 {
598 /* Catch bad driver code */
599 BUG_ON(size == 0);
600
601 if (cpu_has_inclusive_pcaches) {
602 if (size >= scache_size)
603 r4k_blast_scache();
604 else
605 blast_scache_range(addr, addr + size);
606 __sync();
607 return;
608 }
609
610 /*
611 * Either no secondary cache or the available caches don't have the
612 * subset property so we have to flush the primary caches
613 * explicitly
614 */
615 if (cpu_has_safe_index_cacheops && size >= dcache_size) {
616 r4k_blast_dcache();
617 } else {
618 R4600_HIT_CACHEOP_WAR_IMPL;
619 blast_dcache_range(addr, addr + size);
620 }
621
622 bc_wback_inv(addr, size);
623 __sync();
624 }
625
r4k_dma_cache_inv(unsigned long addr,unsigned long size)626 static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
627 {
628 /* Catch bad driver code */
629 BUG_ON(size == 0);
630
631 if (cpu_has_inclusive_pcaches) {
632 if (size >= scache_size)
633 r4k_blast_scache();
634 else {
635 unsigned long lsize = cpu_scache_line_size();
636 unsigned long almask = ~(lsize - 1);
637
638 /*
639 * There is no clearly documented alignment requirement
640 * for the cache instruction on MIPS processors and
641 * some processors, among them the RM5200 and RM7000
642 * QED processors will throw an address error for cache
643 * hit ops with insufficient alignment. Solved by
644 * aligning the address to cache line size.
645 */
646 cache_op(Hit_Writeback_Inv_SD, addr & almask);
647 cache_op(Hit_Writeback_Inv_SD,
648 (addr + size - 1) & almask);
649 blast_inv_scache_range(addr, addr + size);
650 }
651 __sync();
652 return;
653 }
654
655 if (cpu_has_safe_index_cacheops && size >= dcache_size) {
656 r4k_blast_dcache();
657 } else {
658 unsigned long lsize = cpu_dcache_line_size();
659 unsigned long almask = ~(lsize - 1);
660
661 R4600_HIT_CACHEOP_WAR_IMPL;
662 cache_op(Hit_Writeback_Inv_D, addr & almask);
663 cache_op(Hit_Writeback_Inv_D, (addr + size - 1) & almask);
664 blast_inv_dcache_range(addr, addr + size);
665 }
666
667 bc_inv(addr, size);
668 __sync();
669 }
670 #endif /* CONFIG_DMA_NONCOHERENT */
671
672 /*
673 * While we're protected against bad userland addresses we don't care
674 * very much about what happens in that case. Usually a segmentation
675 * fault will dump the process later on anyway ...
676 */
local_r4k_flush_cache_sigtramp(void * arg)677 static void local_r4k_flush_cache_sigtramp(void * arg)
678 {
679 unsigned long ic_lsize = cpu_icache_line_size();
680 unsigned long dc_lsize = cpu_dcache_line_size();
681 unsigned long sc_lsize = cpu_scache_line_size();
682 unsigned long addr = (unsigned long) arg;
683
684 R4600_HIT_CACHEOP_WAR_IMPL;
685 if (dc_lsize)
686 protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
687 if (!cpu_icache_snoops_remote_store && scache_size)
688 protected_writeback_scache_line(addr & ~(sc_lsize - 1));
689 if (ic_lsize)
690 protected_flush_icache_line(addr & ~(ic_lsize - 1));
691 if (MIPS4K_ICACHE_REFILL_WAR) {
692 __asm__ __volatile__ (
693 ".set push\n\t"
694 ".set noat\n\t"
695 ".set mips3\n\t"
696 #ifdef CONFIG_32BIT
697 "la $at,1f\n\t"
698 #endif
699 #ifdef CONFIG_64BIT
700 "dla $at,1f\n\t"
701 #endif
702 "cache %0,($at)\n\t"
703 "nop; nop; nop\n"
704 "1:\n\t"
705 ".set pop"
706 :
707 : "i" (Hit_Invalidate_I));
708 }
709 if (MIPS_CACHE_SYNC_WAR)
710 __asm__ __volatile__ ("sync");
711 }
712
r4k_flush_cache_sigtramp(unsigned long addr)713 static void r4k_flush_cache_sigtramp(unsigned long addr)
714 {
715 r4k_on_each_cpu(local_r4k_flush_cache_sigtramp, (void *) addr);
716 }
717
r4k_flush_icache_all(void)718 static void r4k_flush_icache_all(void)
719 {
720 if (cpu_has_vtag_icache)
721 r4k_blast_icache();
722 }
723
724 struct flush_kernel_vmap_range_args {
725 unsigned long vaddr;
726 int size;
727 };
728
local_r4k_flush_kernel_vmap_range(void * args)729 static inline void local_r4k_flush_kernel_vmap_range(void *args)
730 {
731 struct flush_kernel_vmap_range_args *vmra = args;
732 unsigned long vaddr = vmra->vaddr;
733 int size = vmra->size;
734
735 /*
736 * Aliases only affect the primary caches so don't bother with
737 * S-caches or T-caches.
738 */
739 if (cpu_has_safe_index_cacheops && size >= dcache_size)
740 r4k_blast_dcache();
741 else {
742 R4600_HIT_CACHEOP_WAR_IMPL;
743 blast_dcache_range(vaddr, vaddr + size);
744 }
745 }
746
r4k_flush_kernel_vmap_range(unsigned long vaddr,int size)747 static void r4k_flush_kernel_vmap_range(unsigned long vaddr, int size)
748 {
749 struct flush_kernel_vmap_range_args args;
750
751 args.vaddr = (unsigned long) vaddr;
752 args.size = size;
753
754 r4k_on_each_cpu(local_r4k_flush_kernel_vmap_range, &args);
755 }
756
rm7k_erratum31(void)757 static inline void rm7k_erratum31(void)
758 {
759 const unsigned long ic_lsize = 32;
760 unsigned long addr;
761
762 /* RM7000 erratum #31. The icache is screwed at startup. */
763 write_c0_taglo(0);
764 write_c0_taghi(0);
765
766 for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) {
767 __asm__ __volatile__ (
768 ".set push\n\t"
769 ".set noreorder\n\t"
770 ".set mips3\n\t"
771 "cache\t%1, 0(%0)\n\t"
772 "cache\t%1, 0x1000(%0)\n\t"
773 "cache\t%1, 0x2000(%0)\n\t"
774 "cache\t%1, 0x3000(%0)\n\t"
775 "cache\t%2, 0(%0)\n\t"
776 "cache\t%2, 0x1000(%0)\n\t"
777 "cache\t%2, 0x2000(%0)\n\t"
778 "cache\t%2, 0x3000(%0)\n\t"
779 "cache\t%1, 0(%0)\n\t"
780 "cache\t%1, 0x1000(%0)\n\t"
781 "cache\t%1, 0x2000(%0)\n\t"
782 "cache\t%1, 0x3000(%0)\n\t"
783 ".set pop\n"
784 :
785 : "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill));
786 }
787 }
788
789 static char *way_string[] __cpuinitdata = { NULL, "direct mapped", "2-way",
790 "3-way", "4-way", "5-way", "6-way", "7-way", "8-way"
791 };
792
probe_pcache(void)793 static void __cpuinit probe_pcache(void)
794 {
795 struct cpuinfo_mips *c = ¤t_cpu_data;
796 unsigned int config = read_c0_config();
797 unsigned int prid = read_c0_prid();
798 unsigned long config1;
799 unsigned int lsize;
800
801 switch (c->cputype) {
802 case CPU_R4600: /* QED style two way caches? */
803 case CPU_R4700:
804 case CPU_R5000:
805 case CPU_NEVADA:
806 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
807 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
808 c->icache.ways = 2;
809 c->icache.waybit = __ffs(icache_size/2);
810
811 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
812 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
813 c->dcache.ways = 2;
814 c->dcache.waybit= __ffs(dcache_size/2);
815
816 c->options |= MIPS_CPU_CACHE_CDEX_P;
817 break;
818
819 case CPU_R5432:
820 case CPU_R5500:
821 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
822 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
823 c->icache.ways = 2;
824 c->icache.waybit= 0;
825
826 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
827 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
828 c->dcache.ways = 2;
829 c->dcache.waybit = 0;
830
831 c->options |= MIPS_CPU_CACHE_CDEX_P | MIPS_CPU_PREFETCH;
832 break;
833
834 case CPU_TX49XX:
835 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
836 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
837 c->icache.ways = 4;
838 c->icache.waybit= 0;
839
840 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
841 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
842 c->dcache.ways = 4;
843 c->dcache.waybit = 0;
844
845 c->options |= MIPS_CPU_CACHE_CDEX_P;
846 c->options |= MIPS_CPU_PREFETCH;
847 break;
848
849 case CPU_R4000PC:
850 case CPU_R4000SC:
851 case CPU_R4000MC:
852 case CPU_R4400PC:
853 case CPU_R4400SC:
854 case CPU_R4400MC:
855 case CPU_R4300:
856 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
857 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
858 c->icache.ways = 1;
859 c->icache.waybit = 0; /* doesn't matter */
860
861 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
862 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
863 c->dcache.ways = 1;
864 c->dcache.waybit = 0; /* does not matter */
865
866 c->options |= MIPS_CPU_CACHE_CDEX_P;
867 break;
868
869 case CPU_R10000:
870 case CPU_R12000:
871 case CPU_R14000:
872 icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29));
873 c->icache.linesz = 64;
874 c->icache.ways = 2;
875 c->icache.waybit = 0;
876
877 dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26));
878 c->dcache.linesz = 32;
879 c->dcache.ways = 2;
880 c->dcache.waybit = 0;
881
882 c->options |= MIPS_CPU_PREFETCH;
883 break;
884
885 case CPU_VR4133:
886 write_c0_config(config & ~VR41_CONF_P4K);
887 case CPU_VR4131:
888 /* Workaround for cache instruction bug of VR4131 */
889 if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U ||
890 c->processor_id == 0x0c82U) {
891 config |= 0x00400000U;
892 if (c->processor_id == 0x0c80U)
893 config |= VR41_CONF_BP;
894 write_c0_config(config);
895 } else
896 c->options |= MIPS_CPU_CACHE_CDEX_P;
897
898 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
899 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
900 c->icache.ways = 2;
901 c->icache.waybit = __ffs(icache_size/2);
902
903 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
904 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
905 c->dcache.ways = 2;
906 c->dcache.waybit = __ffs(dcache_size/2);
907 break;
908
909 case CPU_VR41XX:
910 case CPU_VR4111:
911 case CPU_VR4121:
912 case CPU_VR4122:
913 case CPU_VR4181:
914 case CPU_VR4181A:
915 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
916 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
917 c->icache.ways = 1;
918 c->icache.waybit = 0; /* doesn't matter */
919
920 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
921 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
922 c->dcache.ways = 1;
923 c->dcache.waybit = 0; /* does not matter */
924
925 c->options |= MIPS_CPU_CACHE_CDEX_P;
926 break;
927
928 case CPU_RM7000:
929 rm7k_erratum31();
930
931 case CPU_RM9000:
932 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
933 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
934 c->icache.ways = 4;
935 c->icache.waybit = __ffs(icache_size / c->icache.ways);
936
937 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
938 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
939 c->dcache.ways = 4;
940 c->dcache.waybit = __ffs(dcache_size / c->dcache.ways);
941
942 #if !defined(CONFIG_SMP) || !defined(RM9000_CDEX_SMP_WAR)
943 c->options |= MIPS_CPU_CACHE_CDEX_P;
944 #endif
945 c->options |= MIPS_CPU_PREFETCH;
946 break;
947
948 case CPU_LOONGSON2:
949 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
950 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
951 if (prid & 0x3)
952 c->icache.ways = 4;
953 else
954 c->icache.ways = 2;
955 c->icache.waybit = 0;
956
957 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
958 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
959 if (prid & 0x3)
960 c->dcache.ways = 4;
961 else
962 c->dcache.ways = 2;
963 c->dcache.waybit = 0;
964 break;
965
966 default:
967 if (!(config & MIPS_CONF_M))
968 panic("Don't know how to probe P-caches on this cpu.");
969
970 /*
971 * So we seem to be a MIPS32 or MIPS64 CPU
972 * So let's probe the I-cache ...
973 */
974 config1 = read_c0_config1();
975
976 if ((lsize = ((config1 >> 19) & 7)))
977 c->icache.linesz = 2 << lsize;
978 else
979 c->icache.linesz = lsize;
980 c->icache.sets = 64 << ((config1 >> 22) & 7);
981 c->icache.ways = 1 + ((config1 >> 16) & 7);
982
983 icache_size = c->icache.sets *
984 c->icache.ways *
985 c->icache.linesz;
986 c->icache.waybit = __ffs(icache_size/c->icache.ways);
987
988 if (config & 0x8) /* VI bit */
989 c->icache.flags |= MIPS_CACHE_VTAG;
990
991 /*
992 * Now probe the MIPS32 / MIPS64 data cache.
993 */
994 c->dcache.flags = 0;
995
996 if ((lsize = ((config1 >> 10) & 7)))
997 c->dcache.linesz = 2 << lsize;
998 else
999 c->dcache.linesz= lsize;
1000 c->dcache.sets = 64 << ((config1 >> 13) & 7);
1001 c->dcache.ways = 1 + ((config1 >> 7) & 7);
1002
1003 dcache_size = c->dcache.sets *
1004 c->dcache.ways *
1005 c->dcache.linesz;
1006 c->dcache.waybit = __ffs(dcache_size/c->dcache.ways);
1007
1008 c->options |= MIPS_CPU_PREFETCH;
1009 break;
1010 }
1011
1012 /*
1013 * Processor configuration sanity check for the R4000SC erratum
1014 * #5. With page sizes larger than 32kB there is no possibility
1015 * to get a VCE exception anymore so we don't care about this
1016 * misconfiguration. The case is rather theoretical anyway;
1017 * presumably no vendor is shipping his hardware in the "bad"
1018 * configuration.
1019 */
1020 if ((prid & 0xff00) == PRID_IMP_R4000 && (prid & 0xff) < 0x40 &&
1021 !(config & CONF_SC) && c->icache.linesz != 16 &&
1022 PAGE_SIZE <= 0x8000)
1023 panic("Improper R4000SC processor configuration detected");
1024
1025 /* compute a couple of other cache variables */
1026 c->icache.waysize = icache_size / c->icache.ways;
1027 c->dcache.waysize = dcache_size / c->dcache.ways;
1028
1029 c->icache.sets = c->icache.linesz ?
1030 icache_size / (c->icache.linesz * c->icache.ways) : 0;
1031 c->dcache.sets = c->dcache.linesz ?
1032 dcache_size / (c->dcache.linesz * c->dcache.ways) : 0;
1033
1034 /*
1035 * R10000 and R12000 P-caches are odd in a positive way. They're 32kB
1036 * 2-way virtually indexed so normally would suffer from aliases. So
1037 * normally they'd suffer from aliases but magic in the hardware deals
1038 * with that for us so we don't need to take care ourselves.
1039 */
1040 switch (c->cputype) {
1041 case CPU_20KC:
1042 case CPU_25KF:
1043 case CPU_SB1:
1044 case CPU_SB1A:
1045 case CPU_XLR:
1046 c->dcache.flags |= MIPS_CACHE_PINDEX;
1047 break;
1048
1049 case CPU_R10000:
1050 case CPU_R12000:
1051 case CPU_R14000:
1052 break;
1053
1054 case CPU_24K:
1055 case CPU_34K:
1056 case CPU_74K:
1057 case CPU_1004K:
1058 if ((read_c0_config7() & (1 << 16))) {
1059 /* effectively physically indexed dcache,
1060 thus no virtual aliases. */
1061 c->dcache.flags |= MIPS_CACHE_PINDEX;
1062 break;
1063 }
1064 default:
1065 if (c->dcache.waysize > PAGE_SIZE)
1066 c->dcache.flags |= MIPS_CACHE_ALIASES;
1067 }
1068
1069 switch (c->cputype) {
1070 case CPU_20KC:
1071 /*
1072 * Some older 20Kc chips doesn't have the 'VI' bit in
1073 * the config register.
1074 */
1075 c->icache.flags |= MIPS_CACHE_VTAG;
1076 break;
1077
1078 case CPU_ALCHEMY:
1079 c->icache.flags |= MIPS_CACHE_IC_F_DC;
1080 break;
1081 }
1082
1083 #ifdef CONFIG_CPU_LOONGSON2
1084 /*
1085 * LOONGSON2 has 4 way icache, but when using indexed cache op,
1086 * one op will act on all 4 ways
1087 */
1088 c->icache.ways = 1;
1089 #endif
1090
1091 printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
1092 icache_size >> 10,
1093 c->icache.flags & MIPS_CACHE_VTAG ? "VIVT" : "VIPT",
1094 way_string[c->icache.ways], c->icache.linesz);
1095
1096 printk("Primary data cache %ldkB, %s, %s, %s, linesize %d bytes\n",
1097 dcache_size >> 10, way_string[c->dcache.ways],
1098 (c->dcache.flags & MIPS_CACHE_PINDEX) ? "PIPT" : "VIPT",
1099 (c->dcache.flags & MIPS_CACHE_ALIASES) ?
1100 "cache aliases" : "no aliases",
1101 c->dcache.linesz);
1102 }
1103
1104 /*
1105 * If you even _breathe_ on this function, look at the gcc output and make sure
1106 * it does not pop things on and off the stack for the cache sizing loop that
1107 * executes in KSEG1 space or else you will crash and burn badly. You have
1108 * been warned.
1109 */
probe_scache(void)1110 static int __cpuinit probe_scache(void)
1111 {
1112 unsigned long flags, addr, begin, end, pow2;
1113 unsigned int config = read_c0_config();
1114 struct cpuinfo_mips *c = ¤t_cpu_data;
1115
1116 if (config & CONF_SC)
1117 return 0;
1118
1119 begin = (unsigned long) &_stext;
1120 begin &= ~((4 * 1024 * 1024) - 1);
1121 end = begin + (4 * 1024 * 1024);
1122
1123 /*
1124 * This is such a bitch, you'd think they would make it easy to do
1125 * this. Away you daemons of stupidity!
1126 */
1127 local_irq_save(flags);
1128
1129 /* Fill each size-multiple cache line with a valid tag. */
1130 pow2 = (64 * 1024);
1131 for (addr = begin; addr < end; addr = (begin + pow2)) {
1132 unsigned long *p = (unsigned long *) addr;
1133 __asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
1134 pow2 <<= 1;
1135 }
1136
1137 /* Load first line with zero (therefore invalid) tag. */
1138 write_c0_taglo(0);
1139 write_c0_taghi(0);
1140 __asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
1141 cache_op(Index_Store_Tag_I, begin);
1142 cache_op(Index_Store_Tag_D, begin);
1143 cache_op(Index_Store_Tag_SD, begin);
1144
1145 /* Now search for the wrap around point. */
1146 pow2 = (128 * 1024);
1147 for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) {
1148 cache_op(Index_Load_Tag_SD, addr);
1149 __asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
1150 if (!read_c0_taglo())
1151 break;
1152 pow2 <<= 1;
1153 }
1154 local_irq_restore(flags);
1155 addr -= begin;
1156
1157 scache_size = addr;
1158 c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22);
1159 c->scache.ways = 1;
1160 c->dcache.waybit = 0; /* does not matter */
1161
1162 return 1;
1163 }
1164
1165 #if defined(CONFIG_CPU_LOONGSON2)
loongson2_sc_init(void)1166 static void __init loongson2_sc_init(void)
1167 {
1168 struct cpuinfo_mips *c = ¤t_cpu_data;
1169
1170 scache_size = 512*1024;
1171 c->scache.linesz = 32;
1172 c->scache.ways = 4;
1173 c->scache.waybit = 0;
1174 c->scache.waysize = scache_size / (c->scache.ways);
1175 c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1176 pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1177 scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1178
1179 c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1180 }
1181 #endif
1182
1183 extern int r5k_sc_init(void);
1184 extern int rm7k_sc_init(void);
1185 extern int mips_sc_init(void);
1186
setup_scache(void)1187 static void __cpuinit setup_scache(void)
1188 {
1189 struct cpuinfo_mips *c = ¤t_cpu_data;
1190 unsigned int config = read_c0_config();
1191 int sc_present = 0;
1192
1193 /*
1194 * Do the probing thing on R4000SC and R4400SC processors. Other
1195 * processors don't have a S-cache that would be relevant to the
1196 * Linux memory management.
1197 */
1198 switch (c->cputype) {
1199 case CPU_R4000SC:
1200 case CPU_R4000MC:
1201 case CPU_R4400SC:
1202 case CPU_R4400MC:
1203 sc_present = run_uncached(probe_scache);
1204 if (sc_present)
1205 c->options |= MIPS_CPU_CACHE_CDEX_S;
1206 break;
1207
1208 case CPU_R10000:
1209 case CPU_R12000:
1210 case CPU_R14000:
1211 scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16);
1212 c->scache.linesz = 64 << ((config >> 13) & 1);
1213 c->scache.ways = 2;
1214 c->scache.waybit= 0;
1215 sc_present = 1;
1216 break;
1217
1218 case CPU_R5000:
1219 case CPU_NEVADA:
1220 #ifdef CONFIG_R5000_CPU_SCACHE
1221 r5k_sc_init();
1222 #endif
1223 return;
1224
1225 case CPU_RM7000:
1226 case CPU_RM9000:
1227 #ifdef CONFIG_RM7000_CPU_SCACHE
1228 rm7k_sc_init();
1229 #endif
1230 return;
1231
1232 #if defined(CONFIG_CPU_LOONGSON2)
1233 case CPU_LOONGSON2:
1234 loongson2_sc_init();
1235 return;
1236 #endif
1237 case CPU_XLP:
1238 /* don't need to worry about L2, fully coherent */
1239 return;
1240
1241 default:
1242 if (c->isa_level == MIPS_CPU_ISA_M32R1 ||
1243 c->isa_level == MIPS_CPU_ISA_M32R2 ||
1244 c->isa_level == MIPS_CPU_ISA_M64R1 ||
1245 c->isa_level == MIPS_CPU_ISA_M64R2) {
1246 #ifdef CONFIG_MIPS_CPU_SCACHE
1247 if (mips_sc_init ()) {
1248 scache_size = c->scache.ways * c->scache.sets * c->scache.linesz;
1249 printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n",
1250 scache_size >> 10,
1251 way_string[c->scache.ways], c->scache.linesz);
1252 }
1253 #else
1254 if (!(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
1255 panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
1256 #endif
1257 return;
1258 }
1259 sc_present = 0;
1260 }
1261
1262 if (!sc_present)
1263 return;
1264
1265 /* compute a couple of other cache variables */
1266 c->scache.waysize = scache_size / c->scache.ways;
1267
1268 c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1269
1270 printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1271 scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1272
1273 c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1274 }
1275
au1x00_fixup_config_od(void)1276 void au1x00_fixup_config_od(void)
1277 {
1278 /*
1279 * c0_config.od (bit 19) was write only (and read as 0)
1280 * on the early revisions of Alchemy SOCs. It disables the bus
1281 * transaction overlapping and needs to be set to fix various errata.
1282 */
1283 switch (read_c0_prid()) {
1284 case 0x00030100: /* Au1000 DA */
1285 case 0x00030201: /* Au1000 HA */
1286 case 0x00030202: /* Au1000 HB */
1287 case 0x01030200: /* Au1500 AB */
1288 /*
1289 * Au1100 errata actually keeps silence about this bit, so we set it
1290 * just in case for those revisions that require it to be set according
1291 * to the (now gone) cpu table.
1292 */
1293 case 0x02030200: /* Au1100 AB */
1294 case 0x02030201: /* Au1100 BA */
1295 case 0x02030202: /* Au1100 BC */
1296 set_c0_config(1 << 19);
1297 break;
1298 }
1299 }
1300
1301 /* CP0 hazard avoidance. */
1302 #define NXP_BARRIER() \
1303 __asm__ __volatile__( \
1304 ".set noreorder\n\t" \
1305 "nop; nop; nop; nop; nop; nop;\n\t" \
1306 ".set reorder\n\t")
1307
nxp_pr4450_fixup_config(void)1308 static void nxp_pr4450_fixup_config(void)
1309 {
1310 unsigned long config0;
1311
1312 config0 = read_c0_config();
1313
1314 /* clear all three cache coherency fields */
1315 config0 &= ~(0x7 | (7 << 25) | (7 << 28));
1316 config0 |= (((_page_cachable_default >> _CACHE_SHIFT) << 0) |
1317 ((_page_cachable_default >> _CACHE_SHIFT) << 25) |
1318 ((_page_cachable_default >> _CACHE_SHIFT) << 28));
1319 write_c0_config(config0);
1320 NXP_BARRIER();
1321 }
1322
1323 static int __cpuinitdata cca = -1;
1324
cca_setup(char * str)1325 static int __init cca_setup(char *str)
1326 {
1327 get_option(&str, &cca);
1328
1329 return 1;
1330 }
1331
1332 __setup("cca=", cca_setup);
1333
coherency_setup(void)1334 static void __cpuinit coherency_setup(void)
1335 {
1336 if (cca < 0 || cca > 7)
1337 cca = read_c0_config() & CONF_CM_CMASK;
1338 _page_cachable_default = cca << _CACHE_SHIFT;
1339
1340 pr_debug("Using cache attribute %d\n", cca);
1341 change_c0_config(CONF_CM_CMASK, cca);
1342
1343 /*
1344 * c0_status.cu=0 specifies that updates by the sc instruction use
1345 * the coherency mode specified by the TLB; 1 means cachable
1346 * coherent update on write will be used. Not all processors have
1347 * this bit and; some wire it to zero, others like Toshiba had the
1348 * silly idea of putting something else there ...
1349 */
1350 switch (current_cpu_type()) {
1351 case CPU_R4000PC:
1352 case CPU_R4000SC:
1353 case CPU_R4000MC:
1354 case CPU_R4400PC:
1355 case CPU_R4400SC:
1356 case CPU_R4400MC:
1357 clear_c0_config(CONF_CU);
1358 break;
1359 /*
1360 * We need to catch the early Alchemy SOCs with
1361 * the write-only co_config.od bit and set it back to one on:
1362 * Au1000 rev DA, HA, HB; Au1100 AB, BA, BC, Au1500 AB
1363 */
1364 case CPU_ALCHEMY:
1365 au1x00_fixup_config_od();
1366 break;
1367
1368 case PRID_IMP_PR4450:
1369 nxp_pr4450_fixup_config();
1370 break;
1371 }
1372 }
1373
1374 #if defined(CONFIG_DMA_NONCOHERENT)
1375
1376 static int __cpuinitdata coherentio;
1377
setcoherentio(char * str)1378 static int __init setcoherentio(char *str)
1379 {
1380 coherentio = 1;
1381
1382 return 1;
1383 }
1384
1385 __setup("coherentio", setcoherentio);
1386 #endif
1387
r4k_cache_init(void)1388 void __cpuinit r4k_cache_init(void)
1389 {
1390 extern void build_clear_page(void);
1391 extern void build_copy_page(void);
1392 extern char __weak except_vec2_generic;
1393 extern char __weak except_vec2_sb1;
1394 struct cpuinfo_mips *c = ¤t_cpu_data;
1395
1396 switch (c->cputype) {
1397 case CPU_SB1:
1398 case CPU_SB1A:
1399 set_uncached_handler(0x100, &except_vec2_sb1, 0x80);
1400 break;
1401
1402 default:
1403 set_uncached_handler(0x100, &except_vec2_generic, 0x80);
1404 break;
1405 }
1406
1407 probe_pcache();
1408 setup_scache();
1409
1410 r4k_blast_dcache_page_setup();
1411 r4k_blast_dcache_page_indexed_setup();
1412 r4k_blast_dcache_setup();
1413 r4k_blast_icache_page_setup();
1414 r4k_blast_icache_page_indexed_setup();
1415 r4k_blast_icache_setup();
1416 r4k_blast_scache_page_setup();
1417 r4k_blast_scache_page_indexed_setup();
1418 r4k_blast_scache_setup();
1419
1420 /*
1421 * Some MIPS32 and MIPS64 processors have physically indexed caches.
1422 * This code supports virtually indexed processors and will be
1423 * unnecessarily inefficient on physically indexed processors.
1424 */
1425 if (c->dcache.linesz)
1426 shm_align_mask = max_t( unsigned long,
1427 c->dcache.sets * c->dcache.linesz - 1,
1428 PAGE_SIZE - 1);
1429 else
1430 shm_align_mask = PAGE_SIZE-1;
1431
1432 __flush_cache_vmap = r4k__flush_cache_vmap;
1433 __flush_cache_vunmap = r4k__flush_cache_vunmap;
1434
1435 flush_cache_all = cache_noop;
1436 __flush_cache_all = r4k___flush_cache_all;
1437 flush_cache_mm = r4k_flush_cache_mm;
1438 flush_cache_page = r4k_flush_cache_page;
1439 flush_cache_range = r4k_flush_cache_range;
1440
1441 __flush_kernel_vmap_range = r4k_flush_kernel_vmap_range;
1442
1443 flush_cache_sigtramp = r4k_flush_cache_sigtramp;
1444 flush_icache_all = r4k_flush_icache_all;
1445 local_flush_data_cache_page = local_r4k_flush_data_cache_page;
1446 flush_data_cache_page = r4k_flush_data_cache_page;
1447 flush_icache_range = r4k_flush_icache_range;
1448 local_flush_icache_range = local_r4k_flush_icache_range;
1449
1450 #if defined(CONFIG_DMA_NONCOHERENT)
1451 if (coherentio) {
1452 _dma_cache_wback_inv = (void *)cache_noop;
1453 _dma_cache_wback = (void *)cache_noop;
1454 _dma_cache_inv = (void *)cache_noop;
1455 } else {
1456 _dma_cache_wback_inv = r4k_dma_cache_wback_inv;
1457 _dma_cache_wback = r4k_dma_cache_wback_inv;
1458 _dma_cache_inv = r4k_dma_cache_inv;
1459 }
1460 #endif
1461
1462 build_clear_page();
1463 build_copy_page();
1464 #if !defined(CONFIG_MIPS_CMP)
1465 local_r4k___flush_cache_all(NULL);
1466 #endif
1467 coherency_setup();
1468 }
1469