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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
7 * Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Ralf Baechle (ralf@gnu.org)
8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
9 */
10#include <linux/config.h>
11#include <linux/init.h>
12#include <linux/kernel.h>
13#include <linux/sched.h>
14#include <linux/mm.h>
15#include <linux/bitops.h>
16
17#include <asm/bcache.h>
18#include <asm/bootinfo.h>
19#include <asm/cacheops.h>
20#include <asm/cpu.h>
21#include <asm/cpu-features.h>
22#include <asm/io.h>
23#include <asm/page.h>
24#include <asm/pgtable.h>
25#include <asm/r4kcache.h>
26#include <asm/system.h>
27#include <asm/mmu_context.h>
28#include <asm/war.h>
29
30static unsigned long icache_size, dcache_size, scache_size;
31
32/*
33 * Dummy cache handling routines for machines without boardcaches
34 */
35static void no_sc_noop(void) {}
36
37static struct bcache_ops no_sc_ops = {
38 .bc_enable = (void *)no_sc_noop,
39 .bc_disable = (void *)no_sc_noop,
40 .bc_wback_inv = (void *)no_sc_noop,
41 .bc_inv = (void *)no_sc_noop
42};
43
44struct bcache_ops *bcops = &no_sc_ops;
45
46#define cpu_is_r4600_v1_x() ((read_c0_prid() & 0xfffffff0) == 0x2010)
47#define cpu_is_r4600_v2_x() ((read_c0_prid() & 0xfffffff0) == 0x2020)
48
49#define R4600_HIT_CACHEOP_WAR_IMPL \
50do { \
51 if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x()) \
52 *(volatile unsigned long *)CKSEG1; \
53 if (R4600_V1_HIT_CACHEOP_WAR) \
54 __asm__ __volatile__("nop;nop;nop;nop"); \
55} while (0)
56
57static void (*r4k_blast_dcache_page)(unsigned long addr);
58
59static inline void r4k_blast_dcache_page_dc32(unsigned long addr)
60{
61 R4600_HIT_CACHEOP_WAR_IMPL;
62 blast_dcache32_page(addr);
63}
64
65static inline void r4k_blast_dcache_page_setup(void)
66{
67 unsigned long dc_lsize = cpu_dcache_line_size();
68
69 if (dc_lsize == 16)
70 r4k_blast_dcache_page = blast_dcache16_page;
71 else if (dc_lsize == 32)
72 r4k_blast_dcache_page = r4k_blast_dcache_page_dc32;
73}
74
75static void (* r4k_blast_dcache_page_indexed)(unsigned long addr);
76
77static inline void r4k_blast_dcache_page_indexed_setup(void)
78{
79 unsigned long dc_lsize = cpu_dcache_line_size();
80
81 if (dc_lsize == 16)
82 r4k_blast_dcache_page_indexed = blast_dcache16_page_indexed;
83 else if (dc_lsize == 32)
84 r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed;
85}
86
87static void (* r4k_blast_dcache)(void);
88
89static inline void r4k_blast_dcache_setup(void)
90{
91 unsigned long dc_lsize = cpu_dcache_line_size();
92
93 if (dc_lsize == 16)
94 r4k_blast_dcache = blast_dcache16;
95 else if (dc_lsize == 32)
96 r4k_blast_dcache = blast_dcache32;
97}
98
99/* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
100#define JUMP_TO_ALIGN(order) \
101 __asm__ __volatile__( \
102 "b\t1f\n\t" \
103 ".align\t" #order "\n\t" \
104 "1:\n\t" \
105 )
106#define CACHE32_UNROLL32_ALIGN JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
107#define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
108
109static inline void blast_r4600_v1_icache32(void)
110{
111 unsigned long flags;
112
113 local_irq_save(flags);
114 blast_icache32();
115 local_irq_restore(flags);
116}
117
118static inline void tx49_blast_icache32(void)
119{
120 unsigned long start = INDEX_BASE;
121 unsigned long end = start + current_cpu_data.icache.waysize;
122 unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
123 unsigned long ws_end = current_cpu_data.icache.ways <<
124 current_cpu_data.icache.waybit;
125 unsigned long ws, addr;
126
127 CACHE32_UNROLL32_ALIGN2;
128 /* I'm in even chunk. blast odd chunks */
129 for (ws = 0; ws < ws_end; ws += ws_inc)
130 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
131 cache32_unroll32(addr|ws,Index_Invalidate_I);
132 CACHE32_UNROLL32_ALIGN;
133 /* I'm in odd chunk. blast even chunks */
134 for (ws = 0; ws < ws_end; ws += ws_inc)
135 for (addr = start; addr < end; addr += 0x400 * 2)
136 cache32_unroll32(addr|ws,Index_Invalidate_I);
137}
138
139static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page)
140{
141 unsigned long flags;
142
143 local_irq_save(flags);
144 blast_icache32_page_indexed(page);
145 local_irq_restore(flags);
146}
147
148static inline void tx49_blast_icache32_page_indexed(unsigned long page)
149{
150 unsigned long start = page;
151 unsigned long end = start + PAGE_SIZE;
152 unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
153 unsigned long ws_end = current_cpu_data.icache.ways <<
154 current_cpu_data.icache.waybit;
155 unsigned long ws, addr;
156
157 CACHE32_UNROLL32_ALIGN2;
158 /* I'm in even chunk. blast odd chunks */
159 for (ws = 0; ws < ws_end; ws += ws_inc)
160 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
161 cache32_unroll32(addr|ws,Index_Invalidate_I);
162 CACHE32_UNROLL32_ALIGN;
163 /* I'm in odd chunk. blast even chunks */
164 for (ws = 0; ws < ws_end; ws += ws_inc)
165 for (addr = start; addr < end; addr += 0x400 * 2)
166 cache32_unroll32(addr|ws,Index_Invalidate_I);
167}
168
169static void (* r4k_blast_icache_page)(unsigned long addr);
170
171static inline void r4k_blast_icache_page_setup(void)
172{
173 unsigned long ic_lsize = cpu_icache_line_size();
174
175 if (ic_lsize == 16)
176 r4k_blast_icache_page = blast_icache16_page;
177 else if (ic_lsize == 32)
178 r4k_blast_icache_page = blast_icache32_page;
179 else if (ic_lsize == 64)
180 r4k_blast_icache_page = blast_icache64_page;
181}
182
183
184static void (* r4k_blast_icache_page_indexed)(unsigned long addr);
185
186static inline void r4k_blast_icache_page_indexed_setup(void)
187{
188 unsigned long ic_lsize = cpu_icache_line_size();
189
190 if (ic_lsize == 16)
191 r4k_blast_icache_page_indexed = blast_icache16_page_indexed;
192 else if (ic_lsize == 32) {
193 if (TX49XX_ICACHE_INDEX_INV_WAR)
194 r4k_blast_icache_page_indexed =
195 tx49_blast_icache32_page_indexed;
196 else if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
197 r4k_blast_icache_page_indexed =
198 blast_icache32_r4600_v1_page_indexed;
199 else
200 r4k_blast_icache_page_indexed =
201 blast_icache32_page_indexed;
202 } else if (ic_lsize == 64)
203 r4k_blast_icache_page_indexed = blast_icache64_page_indexed;
204}
205
206static void (* r4k_blast_icache)(void);
207
208static inline void r4k_blast_icache_setup(void)
209{
210 unsigned long ic_lsize = cpu_icache_line_size();
211
212 if (ic_lsize == 16)
213 r4k_blast_icache = blast_icache16;
214 else if (ic_lsize == 32) {
215 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
216 r4k_blast_icache = blast_r4600_v1_icache32;
217 else if (TX49XX_ICACHE_INDEX_INV_WAR)
218 r4k_blast_icache = tx49_blast_icache32;
219 else
220 r4k_blast_icache = blast_icache32;
221 } else if (ic_lsize == 64)
222 r4k_blast_icache = blast_icache64;
223}
224
225static void (* r4k_blast_scache_page)(unsigned long addr);
226
227static inline void r4k_blast_scache_page_setup(void)
228{
229 unsigned long sc_lsize = cpu_scache_line_size();
230
231 if (sc_lsize == 16)
232 r4k_blast_scache_page = blast_scache16_page;
233 else if (sc_lsize == 32)
234 r4k_blast_scache_page = blast_scache32_page;
235 else if (sc_lsize == 64)
236 r4k_blast_scache_page = blast_scache64_page;
237 else if (sc_lsize == 128)
238 r4k_blast_scache_page = blast_scache128_page;
239}
240
241static void (* r4k_blast_scache_page_indexed)(unsigned long addr);
242
243static inline void r4k_blast_scache_page_indexed_setup(void)
244{
245 unsigned long sc_lsize = cpu_scache_line_size();
246
247 if (sc_lsize == 16)
248 r4k_blast_scache_page_indexed = blast_scache16_page_indexed;
249 else if (sc_lsize == 32)
250 r4k_blast_scache_page_indexed = blast_scache32_page_indexed;
251 else if (sc_lsize == 64)
252 r4k_blast_scache_page_indexed = blast_scache64_page_indexed;
253 else if (sc_lsize == 128)
254 r4k_blast_scache_page_indexed = blast_scache128_page_indexed;
255}
256
257static void (* r4k_blast_scache)(void);
258
259static inline void r4k_blast_scache_setup(void)
260{
261 unsigned long sc_lsize = cpu_scache_line_size();
262
263 if (sc_lsize == 16)
264 r4k_blast_scache = blast_scache16;
265 else if (sc_lsize == 32)
266 r4k_blast_scache = blast_scache32;
267 else if (sc_lsize == 64)
268 r4k_blast_scache = blast_scache64;
269 else if (sc_lsize == 128)
270 r4k_blast_scache = blast_scache128;
271}
272
273/*
274 * This is former mm's flush_cache_all() which really should be
275 * flush_cache_vunmap these days ...
276 */
277static inline void local_r4k_flush_cache_all(void * args)
278{
279 r4k_blast_dcache();
280 r4k_blast_icache();
281}
282
283static void r4k_flush_cache_all(void)
284{
285 if (!cpu_has_dc_aliases)
286 return;
287
288 on_each_cpu(local_r4k_flush_cache_all, NULL, 1, 1);
289}
290
291static inline void local_r4k___flush_cache_all(void * args)
292{
293 r4k_blast_dcache();
294 r4k_blast_icache();
295
296 switch (current_cpu_data.cputype) {
297 case CPU_R4000SC:
298 case CPU_R4000MC:
299 case CPU_R4400SC:
300 case CPU_R4400MC:
301 case CPU_R10000:
302 case CPU_R12000:
303 r4k_blast_scache();
304 }
305}
306
307static void r4k___flush_cache_all(void)
308{
309 on_each_cpu(local_r4k___flush_cache_all, NULL, 1, 1);
310}
311
312static inline void local_r4k_flush_cache_range(void * args)
313{
314 struct vm_area_struct *vma = args;
315 int exec;
316
317 if (!(cpu_context(smp_processor_id(), vma->vm_mm)))
318 return;
319
320 exec = vma->vm_flags & VM_EXEC;
321 if (cpu_has_dc_aliases || exec)
322 r4k_blast_dcache();
323 if (exec)
324 r4k_blast_icache();
325}
326
327static void r4k_flush_cache_range(struct vm_area_struct *vma,
328 unsigned long start, unsigned long end)
329{
330 on_each_cpu(local_r4k_flush_cache_range, vma, 1, 1);
331}
332
333static inline void local_r4k_flush_cache_mm(void * args)
334{
335 struct mm_struct *mm = args;
336
337 if (!cpu_context(smp_processor_id(), mm))
338 return;
339
340 r4k_blast_dcache();
341 r4k_blast_icache();
342
343 /*
344 * Kludge alert. For obscure reasons R4000SC and R4400SC go nuts if we
345 * only flush the primary caches but R10000 and R12000 behave sane ...
346 */
347 if (current_cpu_data.cputype == CPU_R4000SC ||
348 current_cpu_data.cputype == CPU_R4000MC ||
349 current_cpu_data.cputype == CPU_R4400SC ||
350 current_cpu_data.cputype == CPU_R4400MC)
351 r4k_blast_scache();
352}
353
354static void r4k_flush_cache_mm(struct mm_struct *mm)
355{
356 if (!cpu_has_dc_aliases)
357 return;
358
359 on_each_cpu(local_r4k_flush_cache_mm, mm, 1, 1);
360}
361
362struct flush_cache_page_args {
363 struct vm_area_struct *vma;
364 unsigned long page;
365};
366
367static inline void local_r4k_flush_cache_page(void *args)
368{
369 struct flush_cache_page_args *fcp_args = args;
370 struct vm_area_struct *vma = fcp_args->vma;
371 unsigned long page = fcp_args->page;
372 int exec = vma->vm_flags & VM_EXEC;
373 struct mm_struct *mm = vma->vm_mm;
374 pgd_t *pgdp;
375 pmd_t *pmdp;
376 pte_t *ptep;
377
378 page &= PAGE_MASK;
379 pgdp = pgd_offset(mm, page);
380 pmdp = pmd_offset(pgdp, page);
381 ptep = pte_offset(pmdp, page);
382
383 /*
384 * If the page isn't marked valid, the page cannot possibly be
385 * in the cache.
386 */
387 if (!(pte_val(*ptep) & _PAGE_PRESENT))
388 return;
389
390 /*
391 * Doing flushes for another ASID than the current one is
392 * too difficult since stupid R4k caches do a TLB translation
393 * for every cache flush operation. So we do indexed flushes
394 * in that case, which doesn't overly flush the cache too much.
395 */
396 if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) {
397 if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
398 r4k_blast_dcache_page(page);
399 if (exec && !cpu_icache_snoops_remote_store)
400 r4k_blast_scache_page(page);
401 }
402 if (exec)
403 r4k_blast_icache_page(page);
404
405 return;
406 }
407
408 /*
409 * Do indexed flush, too much work to get the (possible) TLB refills
410 * to work correctly.
411 */
412 page = INDEX_BASE + (page & (dcache_size - 1));
413 if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
414 r4k_blast_dcache_page_indexed(page);
415 if (exec && !cpu_icache_snoops_remote_store)
416 r4k_blast_scache_page_indexed(page);
417 }
418 if (exec) {
419 if (cpu_has_vtag_icache) {
420 int cpu = smp_processor_id();
421
422 if (cpu_context(cpu, vma->vm_mm) != 0)
423 drop_mmu_context(vma->vm_mm, cpu);
424 } else
425 r4k_blast_icache_page_indexed(page);
426 }
427}
428
429static void r4k_flush_cache_page(struct vm_area_struct *vma, unsigned long page, unsigned long pfn)
430{
431 struct flush_cache_page_args args;
432
433 /*
434 * If ownes no valid ASID yet, cannot possibly have gotten
435 * this page into the cache.
436 */
437 if (cpu_context(smp_processor_id(), vma->vm_mm) == 0)
438 return;
439
440 args.vma = vma;
441 args.page = page;
442
443 on_each_cpu(local_r4k_flush_cache_page, &args, 1, 1);
444}
445
446static inline void local_r4k_flush_data_cache_page(void * addr)
447{
448 r4k_blast_dcache_page((unsigned long) addr);
449}
450
451static void r4k_flush_data_cache_page(unsigned long addr)
452{
453 on_each_cpu(local_r4k_flush_data_cache_page, (void *) addr, 1, 1);
454}
455
456struct flush_icache_range_args {
457 unsigned long start;
458 unsigned long end;
459};
460
461static inline void local_r4k_flush_icache_range(void *args)
462{
463 struct flush_icache_range_args *fir_args = args;
464 unsigned long dc_lsize = current_cpu_data.dcache.linesz;
465 unsigned long ic_lsize = current_cpu_data.icache.linesz;
466 unsigned long sc_lsize = current_cpu_data.scache.linesz;
467 unsigned long start = fir_args->start;
468 unsigned long end = fir_args->end;
469 unsigned long addr, aend;
470
471 if (!cpu_has_ic_fills_f_dc) {
472 if (end - start > dcache_size) {
473 r4k_blast_dcache();
474 } else {
475 addr = start & ~(dc_lsize - 1);
476 aend = (end - 1) & ~(dc_lsize - 1);
477
478 while (1) {
479 /* Hit_Writeback_Inv_D */
480 protected_writeback_dcache_line(addr);
481 if (addr == aend)
482 break;
483 addr += dc_lsize;
484 }
485 }
486
487 if (!cpu_icache_snoops_remote_store) {
488 if (end - start > scache_size) {
489 r4k_blast_scache();
490 } else {
491 addr = start & ~(sc_lsize - 1);
492 aend = (end - 1) & ~(sc_lsize - 1);
493
494 while (1) {
495 /* Hit_Writeback_Inv_D */
496 protected_writeback_scache_line(addr);
497 if (addr == aend)
498 break;
499 addr += sc_lsize;
500 }
501 }
502 }
503 }
504
505 if (end - start > icache_size)
506 r4k_blast_icache();
507 else {
508 addr = start & ~(ic_lsize - 1);
509 aend = (end - 1) & ~(ic_lsize - 1);
510 while (1) {
511 /* Hit_Invalidate_I */
512 protected_flush_icache_line(addr);
513 if (addr == aend)
514 break;
515 addr += ic_lsize;
516 }
517 }
518}
519
520static void r4k_flush_icache_range(unsigned long start, unsigned long end)
521{
522 struct flush_icache_range_args args;
523
524 args.start = start;
525 args.end = end;
526
527 on_each_cpu(local_r4k_flush_icache_range, &args, 1, 1);
528}
529
530/*
531 * Ok, this seriously sucks. We use them to flush a user page but don't
532 * know the virtual address, so we have to blast away the whole icache
533 * which is significantly more expensive than the real thing. Otoh we at
534 * least know the kernel address of the page so we can flush it
535 * selectivly.
536 */
537
538struct flush_icache_page_args {
539 struct vm_area_struct *vma;
540 struct page *page;
541};
542
543static inline void local_r4k_flush_icache_page(void *args)
544{
545 struct flush_icache_page_args *fip_args = args;
546 struct vm_area_struct *vma = fip_args->vma;
547 struct page *page = fip_args->page;
548
549 /*
550 * Tricky ... Because we don't know the virtual address we've got the
551 * choice of either invalidating the entire primary and secondary
552 * caches or invalidating the secondary caches also. With the subset
553 * enforcment on R4000SC, R4400SC, R10000 and R12000 invalidating the
554 * secondary cache will result in any entries in the primary caches
555 * also getting invalidated which hopefully is a bit more economical.
556 */
557 if (cpu_has_subset_pcaches) {
558 unsigned long addr = (unsigned long) page_address(page);
559
560 r4k_blast_scache_page(addr);
561 ClearPageDcacheDirty(page);
562
563 return;
564 }
565
566 if (!cpu_has_ic_fills_f_dc) {
567 unsigned long addr = (unsigned long) page_address(page);
568 r4k_blast_dcache_page(addr);
569 if (!cpu_icache_snoops_remote_store)
570 r4k_blast_scache_page(addr);
571 ClearPageDcacheDirty(page);
572 }
573
574 /*
575 * We're not sure of the virtual address(es) involved here, so
576 * we have to flush the entire I-cache.
577 */
578 if (cpu_has_vtag_icache) {
579 int cpu = smp_processor_id();
580
581 if (cpu_context(cpu, vma->vm_mm) != 0)
582 drop_mmu_context(vma->vm_mm, cpu);
583 } else
584 r4k_blast_icache();
585}
586
587static void r4k_flush_icache_page(struct vm_area_struct *vma,
588 struct page *page)
589{
590 struct flush_icache_page_args args;
591
592 /*
593 * If there's no context yet, or the page isn't executable, no I-cache
594 * flush is needed.
595 */
596 if (!(vma->vm_flags & VM_EXEC))
597 return;
598
599 args.vma = vma;
600 args.page = page;
601
602 on_each_cpu(local_r4k_flush_icache_page, &args, 1, 1);
603}
604
605
606#ifdef CONFIG_DMA_NONCOHERENT
607
608static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
609{
610 unsigned long end, a;
611
612 /* Catch bad driver code */
613 BUG_ON(size == 0);
614
615 if (cpu_has_subset_pcaches) {
616 unsigned long sc_lsize = current_cpu_data.scache.linesz;
617
618 if (size >= scache_size) {
619 r4k_blast_scache();
620 return;
621 }
622
623 a = addr & ~(sc_lsize - 1);
624 end = (addr + size - 1) & ~(sc_lsize - 1);
625 while (1) {
626 flush_scache_line(a); /* Hit_Writeback_Inv_SD */
627 if (a == end)
628 break;
629 a += sc_lsize;
630 }
631 return;
632 }
633
634 /*
635 * Either no secondary cache or the available caches don't have the
636 * subset property so we have to flush the primary caches
637 * explicitly
638 */
639 if (size >= dcache_size) {
640 r4k_blast_dcache();
641 } else {
642 unsigned long dc_lsize = current_cpu_data.dcache.linesz;
643
644 R4600_HIT_CACHEOP_WAR_IMPL;
645 a = addr & ~(dc_lsize - 1);
646 end = (addr + size - 1) & ~(dc_lsize - 1);
647 while (1) {
648 flush_dcache_line(a); /* Hit_Writeback_Inv_D */
649 if (a == end)
650 break;
651 a += dc_lsize;
652 }
653 }
654
655 bc_wback_inv(addr, size);
656}
657
658static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
659{
660 unsigned long end, a;
661
662 /* Catch bad driver code */
663 BUG_ON(size == 0);
664
665 if (cpu_has_subset_pcaches) {
666 unsigned long sc_lsize = current_cpu_data.scache.linesz;
667
668 if (size >= scache_size) {
669 r4k_blast_scache();
670 return;
671 }
672
673 a = addr & ~(sc_lsize - 1);
674 end = (addr + size - 1) & ~(sc_lsize - 1);
675 while (1) {
676 flush_scache_line(a); /* Hit_Writeback_Inv_SD */
677 if (a == end)
678 break;
679 a += sc_lsize;
680 }
681 return;
682 }
683
684 if (size >= dcache_size) {
685 r4k_blast_dcache();
686 } else {
687 unsigned long dc_lsize = current_cpu_data.dcache.linesz;
688
689 R4600_HIT_CACHEOP_WAR_IMPL;
690 a = addr & ~(dc_lsize - 1);
691 end = (addr + size - 1) & ~(dc_lsize - 1);
692 while (1) {
693 flush_dcache_line(a); /* Hit_Writeback_Inv_D */
694 if (a == end)
695 break;
696 a += dc_lsize;
697 }
698 }
699
700 bc_inv(addr, size);
701}
702#endif /* CONFIG_DMA_NONCOHERENT */
703
704/*
705 * While we're protected against bad userland addresses we don't care
706 * very much about what happens in that case. Usually a segmentation
707 * fault will dump the process later on anyway ...
708 */
709static void local_r4k_flush_cache_sigtramp(void * arg)
710{
711 unsigned long ic_lsize = current_cpu_data.icache.linesz;
712 unsigned long dc_lsize = current_cpu_data.dcache.linesz;
713 unsigned long sc_lsize = current_cpu_data.scache.linesz;
714 unsigned long addr = (unsigned long) arg;
715
716 R4600_HIT_CACHEOP_WAR_IMPL;
717 protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
718 if (!cpu_icache_snoops_remote_store)
719 protected_writeback_scache_line(addr & ~(sc_lsize - 1));
720 protected_flush_icache_line(addr & ~(ic_lsize - 1));
721 if (MIPS4K_ICACHE_REFILL_WAR) {
722 __asm__ __volatile__ (
723 ".set push\n\t"
724 ".set noat\n\t"
725 ".set mips3\n\t"
726#ifdef CONFIG_MIPS32
727 "la $at,1f\n\t"
728#endif
729#ifdef CONFIG_MIPS64
730 "dla $at,1f\n\t"
731#endif
732 "cache %0,($at)\n\t"
733 "nop; nop; nop\n"
734 "1:\n\t"
735 ".set pop"
736 :
737 : "i" (Hit_Invalidate_I));
738 }
739 if (MIPS_CACHE_SYNC_WAR)
740 __asm__ __volatile__ ("sync");
741}
742
743static void r4k_flush_cache_sigtramp(unsigned long addr)
744{
745 on_each_cpu(local_r4k_flush_cache_sigtramp, (void *) addr, 1, 1);
746}
747
748static void r4k_flush_icache_all(void)
749{
750 if (cpu_has_vtag_icache)
751 r4k_blast_icache();
752}
753
754static inline void rm7k_erratum31(void)
755{
756 const unsigned long ic_lsize = 32;
757 unsigned long addr;
758
759 /* RM7000 erratum #31. The icache is screwed at startup. */
760 write_c0_taglo(0);
761 write_c0_taghi(0);
762
763 for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) {
764 __asm__ __volatile__ (
765 ".set noreorder\n\t"
766 ".set mips3\n\t"
767 "cache\t%1, 0(%0)\n\t"
768 "cache\t%1, 0x1000(%0)\n\t"
769 "cache\t%1, 0x2000(%0)\n\t"
770 "cache\t%1, 0x3000(%0)\n\t"
771 "cache\t%2, 0(%0)\n\t"
772 "cache\t%2, 0x1000(%0)\n\t"
773 "cache\t%2, 0x2000(%0)\n\t"
774 "cache\t%2, 0x3000(%0)\n\t"
775 "cache\t%1, 0(%0)\n\t"
776 "cache\t%1, 0x1000(%0)\n\t"
777 "cache\t%1, 0x2000(%0)\n\t"
778 "cache\t%1, 0x3000(%0)\n\t"
779 ".set\tmips0\n\t"
780 ".set\treorder\n\t"
781 :
782 : "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill));
783 }
784}
785
786static char *way_string[] __initdata = { NULL, "direct mapped", "2-way",
787 "3-way", "4-way", "5-way", "6-way", "7-way", "8-way"
788};
789
790static void __init probe_pcache(void)
791{
792 struct cpuinfo_mips *c = &current_cpu_data;
793 unsigned int config = read_c0_config();
794 unsigned int prid = read_c0_prid();
795 unsigned long config1;
796 unsigned int lsize;
797
798 switch (c->cputype) {
799 case CPU_R4600: /* QED style two way caches? */
800 case CPU_R4700:
801 case CPU_R5000:
802 case CPU_NEVADA:
803 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
804 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
805 c->icache.ways = 2;
806 c->icache.waybit = ffs(icache_size/2) - 1;
807
808 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
809 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
810 c->dcache.ways = 2;
811 c->dcache.waybit= ffs(dcache_size/2) - 1;
812
813 c->options |= MIPS_CPU_CACHE_CDEX_P;
814 break;
815
816 case CPU_R5432:
817 case CPU_R5500:
818 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
819 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
820 c->icache.ways = 2;
821 c->icache.waybit= 0;
822
823 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
824 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
825 c->dcache.ways = 2;
826 c->dcache.waybit = 0;
827
828 c->options |= MIPS_CPU_CACHE_CDEX_P;
829 break;
830
831 case CPU_TX49XX:
832 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
833 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
834 c->icache.ways = 4;
835 c->icache.waybit= 0;
836
837 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
838 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
839 c->dcache.ways = 4;
840 c->dcache.waybit = 0;
841
842 c->options |= MIPS_CPU_CACHE_CDEX_P;
843 break;
844
845 case CPU_R4000PC:
846 case CPU_R4000SC:
847 case CPU_R4000MC:
848 case CPU_R4400PC:
849 case CPU_R4400SC:
850 case CPU_R4400MC:
851 case CPU_R4300:
852 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
853 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
854 c->icache.ways = 1;
855 c->icache.waybit = 0; /* doesn't matter */
856
857 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
858 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
859 c->dcache.ways = 1;
860 c->dcache.waybit = 0; /* does not matter */
861
862 c->options |= MIPS_CPU_CACHE_CDEX_P;
863 break;
864
865 case CPU_R10000:
866 case CPU_R12000:
867 icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29));
868 c->icache.linesz = 64;
869 c->icache.ways = 2;
870 c->icache.waybit = 0;
871
872 dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26));
873 c->dcache.linesz = 32;
874 c->dcache.ways = 2;
875 c->dcache.waybit = 0;
876
877 c->options |= MIPS_CPU_PREFETCH;
878 break;
879
880 case CPU_VR4133:
881 write_c0_config(config & ~CONF_EB);
882 case CPU_VR4131:
883 /* Workaround for cache instruction bug of VR4131 */
884 if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U ||
885 c->processor_id == 0x0c82U) {
886 config &= ~0x00000030U;
887 config |= 0x00410000U;
888 write_c0_config(config);
889 }
890 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
891 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
892 c->icache.ways = 2;
893 c->icache.waybit = ffs(icache_size/2) - 1;
894
895 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
896 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
897 c->dcache.ways = 2;
898 c->dcache.waybit = ffs(dcache_size/2) - 1;
899
900 c->options |= MIPS_CPU_CACHE_CDEX_P;
901 break;
902
903 case CPU_VR41XX:
904 case CPU_VR4111:
905 case CPU_VR4121:
906 case CPU_VR4122:
907 case CPU_VR4181:
908 case CPU_VR4181A:
909 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
910 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
911 c->icache.ways = 1;
912 c->icache.waybit = 0; /* doesn't matter */
913
914 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
915 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
916 c->dcache.ways = 1;
917 c->dcache.waybit = 0; /* does not matter */
918
919 c->options |= MIPS_CPU_CACHE_CDEX_P;
920 break;
921
922 case CPU_RM7000:
923 rm7k_erratum31();
924
925 case CPU_RM9000:
926 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
927 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
928 c->icache.ways = 4;
929 c->icache.waybit = ffs(icache_size / c->icache.ways) - 1;
930
931 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
932 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
933 c->dcache.ways = 4;
934 c->dcache.waybit = ffs(dcache_size / c->dcache.ways) - 1;
935
936#if !defined(CONFIG_SMP) || !defined(RM9000_CDEX_SMP_WAR)
937 c->options |= MIPS_CPU_CACHE_CDEX_P;
938#endif
939 c->options |= MIPS_CPU_PREFETCH;
940 break;
941
942 default:
943 if (!(config & MIPS_CONF_M))
944 panic("Don't know how to probe P-caches on this cpu.");
945
946 /*
947 * So we seem to be a MIPS32 or MIPS64 CPU
948 * So let's probe the I-cache ...
949 */
950 config1 = read_c0_config1();
951
952 if ((lsize = ((config1 >> 19) & 7)))
953 c->icache.linesz = 2 << lsize;
954 else
955 c->icache.linesz = lsize;
956 c->icache.sets = 64 << ((config1 >> 22) & 7);
957 c->icache.ways = 1 + ((config1 >> 16) & 7);
958
959 icache_size = c->icache.sets *
960 c->icache.ways *
961 c->icache.linesz;
962 c->icache.waybit = ffs(icache_size/c->icache.ways) - 1;
963
964 if (config & 0x8) /* VI bit */
965 c->icache.flags |= MIPS_CACHE_VTAG;
966
967 /*
968 * Now probe the MIPS32 / MIPS64 data cache.
969 */
970 c->dcache.flags = 0;
971
972 if ((lsize = ((config1 >> 10) & 7)))
973 c->dcache.linesz = 2 << lsize;
974 else
975 c->dcache.linesz= lsize;
976 c->dcache.sets = 64 << ((config1 >> 13) & 7);
977 c->dcache.ways = 1 + ((config1 >> 7) & 7);
978
979 dcache_size = c->dcache.sets *
980 c->dcache.ways *
981 c->dcache.linesz;
982 c->dcache.waybit = ffs(dcache_size/c->dcache.ways) - 1;
983
984 c->options |= MIPS_CPU_PREFETCH;
985 break;
986 }
987
988 /*
989 * Processor configuration sanity check for the R4000SC erratum
990 * #5. With page sizes larger than 32kB there is no possibility
991 * to get a VCE exception anymore so we don't care about this
992 * misconfiguration. The case is rather theoretical anyway;
993 * presumably no vendor is shipping his hardware in the "bad"
994 * configuration.
995 */
996 if ((prid & 0xff00) == PRID_IMP_R4000 && (prid & 0xff) < 0x40 &&
997 !(config & CONF_SC) && c->icache.linesz != 16 &&
998 PAGE_SIZE <= 0x8000)
999 panic("Improper R4000SC processor configuration detected");
1000
1001 /* compute a couple of other cache variables */
1002 c->icache.waysize = icache_size / c->icache.ways;
1003 c->dcache.waysize = dcache_size / c->dcache.ways;
1004
1005 c->icache.sets = icache_size / (c->icache.linesz * c->icache.ways);
1006 c->dcache.sets = dcache_size / (c->dcache.linesz * c->dcache.ways);
1007
1008 /*
1009 * R10000 and R12000 P-caches are odd in a positive way. They're 32kB
1010 * 2-way virtually indexed so normally would suffer from aliases. So
1011 * normally they'd suffer from aliases but magic in the hardware deals
1012 * with that for us so we don't need to take care ourselves.
1013 */
1014 if (c->cputype != CPU_R10000 && c->cputype != CPU_R12000)
1015 if (c->dcache.waysize > PAGE_SIZE)
1016 c->dcache.flags |= MIPS_CACHE_ALIASES;
1017
1018 switch (c->cputype) {
1019 case CPU_20KC:
1020 /*
1021 * Some older 20Kc chips doesn't have the 'VI' bit in
1022 * the config register.
1023 */
1024 c->icache.flags |= MIPS_CACHE_VTAG;
1025 break;
1026
1027 case CPU_AU1500:
1028 c->icache.flags |= MIPS_CACHE_IC_F_DC;
1029 break;
1030 }
1031
1032 printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
1033 icache_size >> 10,
1034 cpu_has_vtag_icache ? "virtually tagged" : "physically tagged",
1035 way_string[c->icache.ways], c->icache.linesz);
1036
1037 printk("Primary data cache %ldkB, %s, linesize %d bytes.\n",
1038 dcache_size >> 10, way_string[c->dcache.ways], c->dcache.linesz);
1039}
1040
1041/*
1042 * If you even _breathe_ on this function, look at the gcc output and make sure
1043 * it does not pop things on and off the stack for the cache sizing loop that
1044 * executes in KSEG1 space or else you will crash and burn badly. You have
1045 * been warned.
1046 */
1047static int __init probe_scache(void)
1048{
1049 extern unsigned long stext;
1050 unsigned long flags, addr, begin, end, pow2;
1051 unsigned int config = read_c0_config();
1052 struct cpuinfo_mips *c = &current_cpu_data;
1053 int tmp;
1054
1055 if (config & CONF_SC)
1056 return 0;
1057
1058 begin = (unsigned long) &stext;
1059 begin &= ~((4 * 1024 * 1024) - 1);
1060 end = begin + (4 * 1024 * 1024);
1061
1062 /*
1063 * This is such a bitch, you'd think they would make it easy to do
1064 * this. Away you daemons of stupidity!
1065 */
1066 local_irq_save(flags);
1067
1068 /* Fill each size-multiple cache line with a valid tag. */
1069 pow2 = (64 * 1024);
1070 for (addr = begin; addr < end; addr = (begin + pow2)) {
1071 unsigned long *p = (unsigned long *) addr;
1072 __asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
1073 pow2 <<= 1;
1074 }
1075
1076 /* Load first line with zero (therefore invalid) tag. */
1077 write_c0_taglo(0);
1078 write_c0_taghi(0);
1079 __asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
1080 cache_op(Index_Store_Tag_I, begin);
1081 cache_op(Index_Store_Tag_D, begin);
1082 cache_op(Index_Store_Tag_SD, begin);
1083
1084 /* Now search for the wrap around point. */
1085 pow2 = (128 * 1024);
1086 tmp = 0;
1087 for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) {
1088 cache_op(Index_Load_Tag_SD, addr);
1089 __asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
1090 if (!read_c0_taglo())
1091 break;
1092 pow2 <<= 1;
1093 }
1094 local_irq_restore(flags);
1095 addr -= begin;
1096
1097 scache_size = addr;
1098 c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22);
1099 c->scache.ways = 1;
1100 c->dcache.waybit = 0; /* does not matter */
1101
1102 return 1;
1103}
1104
1105typedef int (*probe_func_t)(unsigned long);
1106extern int r5k_sc_init(void);
1107extern int rm7k_sc_init(void);
1108
1109static void __init setup_scache(void)
1110{
1111 struct cpuinfo_mips *c = &current_cpu_data;
1112 unsigned int config = read_c0_config();
1113 probe_func_t probe_scache_kseg1;
1114 int sc_present = 0;
1115
1116 /*
1117 * Do the probing thing on R4000SC and R4400SC processors. Other
1118 * processors don't have a S-cache that would be relevant to the
1119 * Linux memory managment.
1120 */
1121 switch (c->cputype) {
1122 case CPU_R4000SC:
1123 case CPU_R4000MC:
1124 case CPU_R4400SC:
1125 case CPU_R4400MC:
1126 probe_scache_kseg1 = (probe_func_t) (CKSEG1ADDR(&probe_scache));
1127 sc_present = probe_scache_kseg1(config);
1128 if (sc_present)
1129 c->options |= MIPS_CPU_CACHE_CDEX_S;
1130 break;
1131
1132 case CPU_R10000:
1133 case CPU_R12000:
1134 scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16);
1135 c->scache.linesz = 64 << ((config >> 13) & 1);
1136 c->scache.ways = 2;
1137 c->scache.waybit= 0;
1138 sc_present = 1;
1139 break;
1140
1141 case CPU_R5000:
1142 case CPU_NEVADA:
1143#ifdef CONFIG_R5000_CPU_SCACHE
1144 r5k_sc_init();
1145#endif
1146 return;
1147
1148 case CPU_RM7000:
1149 case CPU_RM9000:
1150#ifdef CONFIG_RM7000_CPU_SCACHE
1151 rm7k_sc_init();
1152#endif
1153 return;
1154
1155 default:
1156 sc_present = 0;
1157 }
1158
1159 if (!sc_present)
1160 return;
1161
1162 if ((c->isa_level == MIPS_CPU_ISA_M32 ||
1163 c->isa_level == MIPS_CPU_ISA_M64) &&
1164 !(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
1165 panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
1166
1167 /* compute a couple of other cache variables */
1168 c->scache.waysize = scache_size / c->scache.ways;
1169
1170 c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1171
1172 printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1173 scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1174
1175 c->options |= MIPS_CPU_SUBSET_CACHES;
1176}
1177
1178static inline void coherency_setup(void)
1179{
1180 change_c0_config(CONF_CM_CMASK, CONF_CM_DEFAULT);
1181
1182 /*
1183 * c0_status.cu=0 specifies that updates by the sc instruction use
1184 * the coherency mode specified by the TLB; 1 means cachable
1185 * coherent update on write will be used. Not all processors have
1186 * this bit and; some wire it to zero, others like Toshiba had the
1187 * silly idea of putting something else there ...
1188 */
1189 switch (current_cpu_data.cputype) {
1190 case CPU_R4000PC:
1191 case CPU_R4000SC:
1192 case CPU_R4000MC:
1193 case CPU_R4400PC:
1194 case CPU_R4400SC:
1195 case CPU_R4400MC:
1196 clear_c0_config(CONF_CU);
1197 break;
1198 }
1199}
1200
1201void __init ld_mmu_r4xx0(void)
1202{
1203 extern void build_clear_page(void);
1204 extern void build_copy_page(void);
1205 extern char except_vec2_generic;
1206 struct cpuinfo_mips *c = &current_cpu_data;
1207
1208 /* Default cache error handler for R4000 and R5000 family */
1209 memcpy((void *)(CAC_BASE + 0x100), &except_vec2_generic, 0x80);
1210 memcpy((void *)(UNCAC_BASE + 0x100), &except_vec2_generic, 0x80);
1211
1212 probe_pcache();
1213 setup_scache();
1214
1215 if (c->dcache.sets * c->dcache.ways > PAGE_SIZE)
1216 c->dcache.flags |= MIPS_CACHE_ALIASES;
1217
1218 r4k_blast_dcache_page_setup();
1219 r4k_blast_dcache_page_indexed_setup();
1220 r4k_blast_dcache_setup();
1221 r4k_blast_icache_page_setup();
1222 r4k_blast_icache_page_indexed_setup();
1223 r4k_blast_icache_setup();
1224 r4k_blast_scache_page_setup();
1225 r4k_blast_scache_page_indexed_setup();
1226 r4k_blast_scache_setup();
1227
1228 /*
1229 * Some MIPS32 and MIPS64 processors have physically indexed caches.
1230 * This code supports virtually indexed processors and will be
1231 * unnecessarily inefficient on physically indexed processors.
1232 */
1233 shm_align_mask = max_t( unsigned long,
1234 c->dcache.sets * c->dcache.linesz - 1,
1235 PAGE_SIZE - 1);
1236
1237 flush_cache_all = r4k_flush_cache_all;
1238 __flush_cache_all = r4k___flush_cache_all;
1239 flush_cache_mm = r4k_flush_cache_mm;
1240 flush_cache_page = r4k_flush_cache_page;
1241 flush_icache_page = r4k_flush_icache_page;
1242 flush_cache_range = r4k_flush_cache_range;
1243
1244 flush_cache_sigtramp = r4k_flush_cache_sigtramp;
1245 flush_icache_all = r4k_flush_icache_all;
1246 flush_data_cache_page = r4k_flush_data_cache_page;
1247 flush_icache_range = r4k_flush_icache_range;
1248
1249#ifdef CONFIG_DMA_NONCOHERENT
1250 _dma_cache_wback_inv = r4k_dma_cache_wback_inv;
1251 _dma_cache_wback = r4k_dma_cache_wback_inv;
1252 _dma_cache_inv = r4k_dma_cache_inv;
1253#endif
1254
1255 __flush_cache_all();
1256 coherency_setup();
1257
1258 build_clear_page();
1259 build_copy_page();
1260}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-14 00:04:58 -0500