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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 (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/system.h>
33#include <asm/mmu_context.h>
34#include <asm/war.h>
35#include <asm/cacheflush.h> /* for run_uncached() */
36
37
38/*
39 * Special Variant of smp_call_function for use by cache functions:
40 *
41 * o No return value
42 * o collapses to normal function call on UP kernels
43 * o collapses to normal function call on systems with a single shared
44 * primary cache.
45 * o doesn't disable interrupts on the local CPU
46 */
47static inline void r4k_on_each_cpu(void (*func) (void *info), void *info)
48{
49 preempt_disable();
50
51#if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC)
52 smp_call_function(func, info, 1);
53#endif
54 func(info);
55 preempt_enable();
56}
57
58#if defined(CONFIG_MIPS_CMP)
59#define cpu_has_safe_index_cacheops 0
60#else
61#define cpu_has_safe_index_cacheops 1
62#endif
63
64/*
65 * Must die.
66 */
67static unsigned long icache_size __read_mostly;
68static unsigned long dcache_size __read_mostly;
69static unsigned long scache_size __read_mostly;
70
71/*
72 * Dummy cache handling routines for machines without boardcaches
73 */
74static void cache_noop(void) {}
75
76static struct bcache_ops no_sc_ops = {
77 .bc_enable = (void *)cache_noop,
78 .bc_disable = (void *)cache_noop,
79 .bc_wback_inv = (void *)cache_noop,
80 .bc_inv = (void *)cache_noop
81};
82
83struct bcache_ops *bcops = &no_sc_ops;
84
85#define cpu_is_r4600_v1_x() ((read_c0_prid() & 0xfffffff0) == 0x00002010)
86#define cpu_is_r4600_v2_x() ((read_c0_prid() & 0xfffffff0) == 0x00002020)
87
88#define R4600_HIT_CACHEOP_WAR_IMPL \
89do { \
90 if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x()) \
91 *(volatile unsigned long *)CKSEG1; \
92 if (R4600_V1_HIT_CACHEOP_WAR) \
93 __asm__ __volatile__("nop;nop;nop;nop"); \
94} while (0)
95
96static void (*r4k_blast_dcache_page)(unsigned long addr);
97
98static inline void r4k_blast_dcache_page_dc32(unsigned long addr)
99{
100 R4600_HIT_CACHEOP_WAR_IMPL;
101 blast_dcache32_page(addr);
102}
103
104static inline void r4k_blast_dcache_page_dc64(unsigned long addr)
105{
106 R4600_HIT_CACHEOP_WAR_IMPL;
107 blast_dcache64_page(addr);
108}
109
110static void __cpuinit r4k_blast_dcache_page_setup(void)
111{
112 unsigned long dc_lsize = cpu_dcache_line_size();
113
114 if (dc_lsize == 0)
115 r4k_blast_dcache_page = (void *)cache_noop;
116 else if (dc_lsize == 16)
117 r4k_blast_dcache_page = blast_dcache16_page;
118 else if (dc_lsize == 32)
119 r4k_blast_dcache_page = r4k_blast_dcache_page_dc32;
120 else if (dc_lsize == 64)
121 r4k_blast_dcache_page = r4k_blast_dcache_page_dc64;
122}
123
124static void (* r4k_blast_dcache_page_indexed)(unsigned long addr);
125
126static void __cpuinit r4k_blast_dcache_page_indexed_setup(void)
127{
128 unsigned long dc_lsize = cpu_dcache_line_size();
129
130 if (dc_lsize == 0)
131 r4k_blast_dcache_page_indexed = (void *)cache_noop;
132 else if (dc_lsize == 16)
133 r4k_blast_dcache_page_indexed = blast_dcache16_page_indexed;
134 else if (dc_lsize == 32)
135 r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed;
136 else if (dc_lsize == 64)
137 r4k_blast_dcache_page_indexed = blast_dcache64_page_indexed;
138}
139
140static void (* r4k_blast_dcache)(void);
141
142static void __cpuinit r4k_blast_dcache_setup(void)
143{
144 unsigned long dc_lsize = cpu_dcache_line_size();
145
146 if (dc_lsize == 0)
147 r4k_blast_dcache = (void *)cache_noop;
148 else if (dc_lsize == 16)
149 r4k_blast_dcache = blast_dcache16;
150 else if (dc_lsize == 32)
151 r4k_blast_dcache = blast_dcache32;
152 else if (dc_lsize == 64)
153 r4k_blast_dcache = blast_dcache64;
154}
155
156/* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
157#define JUMP_TO_ALIGN(order) \
158 __asm__ __volatile__( \
159 "b\t1f\n\t" \
160 ".align\t" #order "\n\t" \
161 "1:\n\t" \
162 )
163#define CACHE32_UNROLL32_ALIGN JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
164#define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
165
166static inline void blast_r4600_v1_icache32(void)
167{
168 unsigned long flags;
169
170 local_irq_save(flags);
171 blast_icache32();
172 local_irq_restore(flags);
173}
174
175static inline void tx49_blast_icache32(void)
176{
177 unsigned long start = INDEX_BASE;
178 unsigned long end = start + current_cpu_data.icache.waysize;
179 unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
180 unsigned long ws_end = current_cpu_data.icache.ways <<
181 current_cpu_data.icache.waybit;
182 unsigned long ws, addr;
183
184 CACHE32_UNROLL32_ALIGN2;
185 /* I'm in even chunk. blast odd chunks */
186 for (ws = 0; ws < ws_end; ws += ws_inc)
187 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
188 cache32_unroll32(addr|ws, Index_Invalidate_I);
189 CACHE32_UNROLL32_ALIGN;
190 /* I'm in odd chunk. blast even chunks */
191 for (ws = 0; ws < ws_end; ws += ws_inc)
192 for (addr = start; addr < end; addr += 0x400 * 2)
193 cache32_unroll32(addr|ws, Index_Invalidate_I);
194}
195
196static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page)
197{
198 unsigned long flags;
199
200 local_irq_save(flags);
201 blast_icache32_page_indexed(page);
202 local_irq_restore(flags);
203}
204
205static inline void tx49_blast_icache32_page_indexed(unsigned long page)
206{
207 unsigned long indexmask = current_cpu_data.icache.waysize - 1;
208 unsigned long start = INDEX_BASE + (page & indexmask);
209 unsigned long end = start + PAGE_SIZE;
210 unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
211 unsigned long ws_end = current_cpu_data.icache.ways <<
212 current_cpu_data.icache.waybit;
213 unsigned long ws, addr;
214
215 CACHE32_UNROLL32_ALIGN2;
216 /* I'm in even chunk. blast odd chunks */
217 for (ws = 0; ws < ws_end; ws += ws_inc)
218 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
219 cache32_unroll32(addr|ws, Index_Invalidate_I);
220 CACHE32_UNROLL32_ALIGN;
221 /* I'm in odd chunk. blast even chunks */
222 for (ws = 0; ws < ws_end; ws += ws_inc)
223 for (addr = start; addr < end; addr += 0x400 * 2)
224 cache32_unroll32(addr|ws, Index_Invalidate_I);
225}
226
227static void (* r4k_blast_icache_page)(unsigned long addr);
228
229static void __cpuinit r4k_blast_icache_page_setup(void)
230{
231 unsigned long ic_lsize = cpu_icache_line_size();
232
233 if (ic_lsize == 0)
234 r4k_blast_icache_page = (void *)cache_noop;
235 else if (ic_lsize == 16)
236 r4k_blast_icache_page = blast_icache16_page;
237 else if (ic_lsize == 32)
238 r4k_blast_icache_page = blast_icache32_page;
239 else if (ic_lsize == 64)
240 r4k_blast_icache_page = blast_icache64_page;
241}
242
243
244static void (* r4k_blast_icache_page_indexed)(unsigned long addr);
245
246static void __cpuinit r4k_blast_icache_page_indexed_setup(void)
247{
248 unsigned long ic_lsize = cpu_icache_line_size();
249
250 if (ic_lsize == 0)
251 r4k_blast_icache_page_indexed = (void *)cache_noop;
252 else if (ic_lsize == 16)
253 r4k_blast_icache_page_indexed = blast_icache16_page_indexed;
254 else if (ic_lsize == 32) {
255 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
256 r4k_blast_icache_page_indexed =
257 blast_icache32_r4600_v1_page_indexed;
258 else if (TX49XX_ICACHE_INDEX_INV_WAR)
259 r4k_blast_icache_page_indexed =
260 tx49_blast_icache32_page_indexed;
261 else
262 r4k_blast_icache_page_indexed =
263 blast_icache32_page_indexed;
264 } else if (ic_lsize == 64)
265 r4k_blast_icache_page_indexed = blast_icache64_page_indexed;
266}
267
268static void (* r4k_blast_icache)(void);
269
270static void __cpuinit r4k_blast_icache_setup(void)
271{
272 unsigned long ic_lsize = cpu_icache_line_size();
273
274 if (ic_lsize == 0)
275 r4k_blast_icache = (void *)cache_noop;
276 else if (ic_lsize == 16)
277 r4k_blast_icache = blast_icache16;
278 else if (ic_lsize == 32) {
279 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
280 r4k_blast_icache = blast_r4600_v1_icache32;
281 else if (TX49XX_ICACHE_INDEX_INV_WAR)
282 r4k_blast_icache = tx49_blast_icache32;
283 else
284 r4k_blast_icache = blast_icache32;
285 } else if (ic_lsize == 64)
286 r4k_blast_icache = blast_icache64;
287}
288
289static void (* r4k_blast_scache_page)(unsigned long addr);
290
291static void __cpuinit r4k_blast_scache_page_setup(void)
292{
293 unsigned long sc_lsize = cpu_scache_line_size();
294
295 if (scache_size == 0)
296 r4k_blast_scache_page = (void *)cache_noop;
297 else if (sc_lsize == 16)
298 r4k_blast_scache_page = blast_scache16_page;
299 else if (sc_lsize == 32)
300 r4k_blast_scache_page = blast_scache32_page;
301 else if (sc_lsize == 64)
302 r4k_blast_scache_page = blast_scache64_page;
303 else if (sc_lsize == 128)
304 r4k_blast_scache_page = blast_scache128_page;
305}
306
307static void (* r4k_blast_scache_page_indexed)(unsigned long addr);
308
309static void __cpuinit r4k_blast_scache_page_indexed_setup(void)
310{
311 unsigned long sc_lsize = cpu_scache_line_size();
312
313 if (scache_size == 0)
314 r4k_blast_scache_page_indexed = (void *)cache_noop;
315 else if (sc_lsize == 16)
316 r4k_blast_scache_page_indexed = blast_scache16_page_indexed;
317 else if (sc_lsize == 32)
318 r4k_blast_scache_page_indexed = blast_scache32_page_indexed;
319 else if (sc_lsize == 64)
320 r4k_blast_scache_page_indexed = blast_scache64_page_indexed;
321 else if (sc_lsize == 128)
322 r4k_blast_scache_page_indexed = blast_scache128_page_indexed;
323}
324
325static void (* r4k_blast_scache)(void);
326
327static void __cpuinit r4k_blast_scache_setup(void)
328{
329 unsigned long sc_lsize = cpu_scache_line_size();
330
331 if (scache_size == 0)
332 r4k_blast_scache = (void *)cache_noop;
333 else if (sc_lsize == 16)
334 r4k_blast_scache = blast_scache16;
335 else if (sc_lsize == 32)
336 r4k_blast_scache = blast_scache32;
337 else if (sc_lsize == 64)
338 r4k_blast_scache = blast_scache64;
339 else if (sc_lsize == 128)
340 r4k_blast_scache = blast_scache128;
341}
342
343static inline void local_r4k___flush_cache_all(void * args)
344{
345#if defined(CONFIG_CPU_LOONGSON2)
346 r4k_blast_scache();
347 return;
348#endif
349 r4k_blast_dcache();
350 r4k_blast_icache();
351
352 switch (current_cpu_type()) {
353 case CPU_R4000SC:
354 case CPU_R4000MC:
355 case CPU_R4400SC:
356 case CPU_R4400MC:
357 case CPU_R10000:
358 case CPU_R12000:
359 case CPU_R14000:
360 r4k_blast_scache();
361 }
362}
363
364static void r4k___flush_cache_all(void)
365{
366 r4k_on_each_cpu(local_r4k___flush_cache_all, NULL);
367}
368
369static inline int has_valid_asid(const struct mm_struct *mm)
370{
371#if defined(CONFIG_MIPS_MT_SMP) || defined(CONFIG_MIPS_MT_SMTC)
372 int i;
373
374 for_each_online_cpu(i)
375 if (cpu_context(i, mm))
376 return 1;
377
378 return 0;
379#else
380 return cpu_context(smp_processor_id(), mm);
381#endif
382}
383
384static void r4k__flush_cache_vmap(void)
385{
386 r4k_blast_dcache();
387}
388
389static void r4k__flush_cache_vunmap(void)
390{
391 r4k_blast_dcache();
392}
393
394static inline void local_r4k_flush_cache_range(void * args)
395{
396 struct vm_area_struct *vma = args;
397 int exec = vma->vm_flags & VM_EXEC;
398
399 if (!(has_valid_asid(vma->vm_mm)))
400 return;
401
402 r4k_blast_dcache();
403 if (exec)
404 r4k_blast_icache();
405}
406
407static void r4k_flush_cache_range(struct vm_area_struct *vma,
408 unsigned long start, unsigned long end)
409{
410 int exec = vma->vm_flags & VM_EXEC;
411
412 if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc))
413 r4k_on_each_cpu(local_r4k_flush_cache_range, vma);
414}
415
416static inline void local_r4k_flush_cache_mm(void * args)
417{
418 struct mm_struct *mm = args;
419
420 if (!has_valid_asid(mm))
421 return;
422
423 /*
424 * Kludge alert. For obscure reasons R4000SC and R4400SC go nuts if we
425 * only flush the primary caches but R10000 and R12000 behave sane ...
426 * R4000SC and R4400SC indexed S-cache ops also invalidate primary
427 * caches, so we can bail out early.
428 */
429 if (current_cpu_type() == CPU_R4000SC ||
430 current_cpu_type() == CPU_R4000MC ||
431 current_cpu_type() == CPU_R4400SC ||
432 current_cpu_type() == CPU_R4400MC) {
433 r4k_blast_scache();
434 return;
435 }
436
437 r4k_blast_dcache();
438}
439
440static void r4k_flush_cache_mm(struct mm_struct *mm)
441{
442 if (!cpu_has_dc_aliases)
443 return;
444
445 r4k_on_each_cpu(local_r4k_flush_cache_mm, mm);
446}
447
448struct flush_cache_page_args {
449 struct vm_area_struct *vma;
450 unsigned long addr;
451 unsigned long pfn;
452};
453
454static inline void local_r4k_flush_cache_page(void *args)
455{
456 struct flush_cache_page_args *fcp_args = args;
457 struct vm_area_struct *vma = fcp_args->vma;
458 unsigned long addr = fcp_args->addr;
459 struct page *page = pfn_to_page(fcp_args->pfn);
460 int exec = vma->vm_flags & VM_EXEC;
461 struct mm_struct *mm = vma->vm_mm;
462 int map_coherent = 0;
463 pgd_t *pgdp;
464 pud_t *pudp;
465 pmd_t *pmdp;
466 pte_t *ptep;
467 void *vaddr;
468
469 /*
470 * If ownes no valid ASID yet, cannot possibly have gotten
471 * this page into the cache.
472 */
473 if (!has_valid_asid(mm))
474 return;
475
476 addr &= PAGE_MASK;
477 pgdp = pgd_offset(mm, addr);
478 pudp = pud_offset(pgdp, addr);
479 pmdp = pmd_offset(pudp, addr);
480 ptep = pte_offset(pmdp, addr);
481
482 /*
483 * If the page isn't marked valid, the page cannot possibly be
484 * in the cache.
485 */
486 if (!(pte_present(*ptep)))
487 return;
488
489 if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID))
490 vaddr = NULL;
491 else {
492 /*
493 * Use kmap_coherent or kmap_atomic to do flushes for
494 * another ASID than the current one.
495 */
496 map_coherent = (cpu_has_dc_aliases &&
497 page_mapped(page) && !Page_dcache_dirty(page));
498 if (map_coherent)
499 vaddr = kmap_coherent(page, addr);
500 else
501 vaddr = kmap_atomic(page, KM_USER0);
502 addr = (unsigned long)vaddr;
503 }
504
505 if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
506 r4k_blast_dcache_page(addr);
507 if (exec && !cpu_icache_snoops_remote_store)
508 r4k_blast_scache_page(addr);
509 }
510 if (exec) {
511 if (vaddr && cpu_has_vtag_icache && mm == current->active_mm) {
512 int cpu = smp_processor_id();
513
514 if (cpu_context(cpu, mm) != 0)
515 drop_mmu_context(mm, cpu);
516 } else
517 r4k_blast_icache_page(addr);
518 }
519
520 if (vaddr) {
521 if (map_coherent)
522 kunmap_coherent();
523 else
524 kunmap_atomic(vaddr, KM_USER0);
525 }
526}
527
528static void r4k_flush_cache_page(struct vm_area_struct *vma,
529 unsigned long addr, unsigned long pfn)
530{
531 struct flush_cache_page_args args;
532
533 args.vma = vma;
534 args.addr = addr;
535 args.pfn = pfn;
536
537 r4k_on_each_cpu(local_r4k_flush_cache_page, &args);
538}
539
540static inline void local_r4k_flush_data_cache_page(void * addr)
541{
542 r4k_blast_dcache_page((unsigned long) addr);
543}
544
545static void r4k_flush_data_cache_page(unsigned long addr)
546{
547 if (in_atomic())
548 local_r4k_flush_data_cache_page((void *)addr);
549 else
550 r4k_on_each_cpu(local_r4k_flush_data_cache_page, (void *) addr);
551}
552
553struct flush_icache_range_args {
554 unsigned long start;
555 unsigned long end;
556};
557
558static inline void local_r4k_flush_icache_range(unsigned long start, unsigned long end)
559{
560 if (!cpu_has_ic_fills_f_dc) {
561 if (end - start >= dcache_size) {
562 r4k_blast_dcache();
563 } else {
564 R4600_HIT_CACHEOP_WAR_IMPL;
565 protected_blast_dcache_range(start, end);
566 }
567 }
568
569 if (end - start > icache_size)
570 r4k_blast_icache();
571 else
572 protected_blast_icache_range(start, end);
573}
574
575static inline void local_r4k_flush_icache_range_ipi(void *args)
576{
577 struct flush_icache_range_args *fir_args = args;
578 unsigned long start = fir_args->start;
579 unsigned long end = fir_args->end;
580
581 local_r4k_flush_icache_range(start, end);
582}
583
584static void r4k_flush_icache_range(unsigned long start, unsigned long end)
585{
586 struct flush_icache_range_args args;
587
588 args.start = start;
589 args.end = end;
590
591 r4k_on_each_cpu(local_r4k_flush_icache_range_ipi, &args);
592 instruction_hazard();
593}
594
595#ifdef CONFIG_DMA_NONCOHERENT
596
597static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
598{
599 /* Catch bad driver code */
600 BUG_ON(size == 0);
601
602 if (cpu_has_inclusive_pcaches) {
603 if (size >= scache_size)
604 r4k_blast_scache();
605 else
606 blast_scache_range(addr, addr + size);
607 __sync();
608 return;
609 }
610
611 /*
612 * Either no secondary cache or the available caches don't have the
613 * subset property so we have to flush the primary caches
614 * explicitly
615 */
616 if (cpu_has_safe_index_cacheops && size >= dcache_size) {
617 r4k_blast_dcache();
618 } else {
619 R4600_HIT_CACHEOP_WAR_IMPL;
620 blast_dcache_range(addr, addr + size);
621 }
622
623 bc_wback_inv(addr, size);
624 __sync();
625}
626
627static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
628{
629 /* Catch bad driver code */
630 BUG_ON(size == 0);
631
632 if (cpu_has_inclusive_pcaches) {
633 if (size >= scache_size)
634 r4k_blast_scache();
635 else {
636 unsigned long lsize = cpu_scache_line_size();
637 unsigned long almask = ~(lsize - 1);
638
639 /*
640 * There is no clearly documented alignment requirement
641 * for the cache instruction on MIPS processors and
642 * some processors, among them the RM5200 and RM7000
643 * QED processors will throw an address error for cache
644 * hit ops with insufficient alignment. Solved by
645 * aligning the address to cache line size.
646 */
647 cache_op(Hit_Writeback_Inv_SD, addr & almask);
648 cache_op(Hit_Writeback_Inv_SD,
649 (addr + size - 1) & almask);
650 blast_inv_scache_range(addr, addr + size);
651 }
652 __sync();
653 return;
654 }
655
656 if (cpu_has_safe_index_cacheops && size >= dcache_size) {
657 r4k_blast_dcache();
658 } else {
659 unsigned long lsize = cpu_dcache_line_size();
660 unsigned long almask = ~(lsize - 1);
661
662 R4600_HIT_CACHEOP_WAR_IMPL;
663 cache_op(Hit_Writeback_Inv_D, addr & almask);
664 cache_op(Hit_Writeback_Inv_D, (addr + size - 1) & almask);
665 blast_inv_dcache_range(addr, addr + size);
666 }
667
668 bc_inv(addr, size);
669 __sync();
670}
671#endif /* CONFIG_DMA_NONCOHERENT */
672
673/*
674 * While we're protected against bad userland addresses we don't care
675 * very much about what happens in that case. Usually a segmentation
676 * fault will dump the process later on anyway ...
677 */
678static void local_r4k_flush_cache_sigtramp(void * arg)
679{
680 unsigned long ic_lsize = cpu_icache_line_size();
681 unsigned long dc_lsize = cpu_dcache_line_size();
682 unsigned long sc_lsize = cpu_scache_line_size();
683 unsigned long addr = (unsigned long) arg;
684
685 R4600_HIT_CACHEOP_WAR_IMPL;
686 if (dc_lsize)
687 protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
688 if (!cpu_icache_snoops_remote_store && scache_size)
689 protected_writeback_scache_line(addr & ~(sc_lsize - 1));
690 if (ic_lsize)
691 protected_flush_icache_line(addr & ~(ic_lsize - 1));
692 if (MIPS4K_ICACHE_REFILL_WAR) {
693 __asm__ __volatile__ (
694 ".set push\n\t"
695 ".set noat\n\t"
696 ".set mips3\n\t"
697#ifdef CONFIG_32BIT
698 "la $at,1f\n\t"
699#endif
700#ifdef CONFIG_64BIT
701 "dla $at,1f\n\t"
702#endif
703 "cache %0,($at)\n\t"
704 "nop; nop; nop\n"
705 "1:\n\t"
706 ".set pop"
707 :
708 : "i" (Hit_Invalidate_I));
709 }
710 if (MIPS_CACHE_SYNC_WAR)
711 __asm__ __volatile__ ("sync");
712}
713
714static void r4k_flush_cache_sigtramp(unsigned long addr)
715{
716 r4k_on_each_cpu(local_r4k_flush_cache_sigtramp, (void *) addr);
717}
718
719static void r4k_flush_icache_all(void)
720{
721 if (cpu_has_vtag_icache)
722 r4k_blast_icache();
723}
724
725static inline void rm7k_erratum31(void)
726{
727 const unsigned long ic_lsize = 32;
728 unsigned long addr;
729
730 /* RM7000 erratum #31. The icache is screwed at startup. */
731 write_c0_taglo(0);
732 write_c0_taghi(0);
733
734 for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) {
735 __asm__ __volatile__ (
736 ".set push\n\t"
737 ".set noreorder\n\t"
738 ".set mips3\n\t"
739 "cache\t%1, 0(%0)\n\t"
740 "cache\t%1, 0x1000(%0)\n\t"
741 "cache\t%1, 0x2000(%0)\n\t"
742 "cache\t%1, 0x3000(%0)\n\t"
743 "cache\t%2, 0(%0)\n\t"
744 "cache\t%2, 0x1000(%0)\n\t"
745 "cache\t%2, 0x2000(%0)\n\t"
746 "cache\t%2, 0x3000(%0)\n\t"
747 "cache\t%1, 0(%0)\n\t"
748 "cache\t%1, 0x1000(%0)\n\t"
749 "cache\t%1, 0x2000(%0)\n\t"
750 "cache\t%1, 0x3000(%0)\n\t"
751 ".set pop\n"
752 :
753 : "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill));
754 }
755}
756
757static char *way_string[] __cpuinitdata = { NULL, "direct mapped", "2-way",
758 "3-way", "4-way", "5-way", "6-way", "7-way", "8-way"
759};
760
761static void __cpuinit probe_pcache(void)
762{
763 struct cpuinfo_mips *c = ¤t_cpu_data;
764 unsigned int config = read_c0_config();
765 unsigned int prid = read_c0_prid();
766 unsigned long config1;
767 unsigned int lsize;
768
769 switch (c->cputype) {
770 case CPU_R4600: /* QED style two way caches? */
771 case CPU_R4700:
772 case CPU_R5000:
773 case CPU_NEVADA:
774 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
775 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
776 c->icache.ways = 2;
777 c->icache.waybit = __ffs(icache_size/2);
778
779 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
780 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
781 c->dcache.ways = 2;
782 c->dcache.waybit= __ffs(dcache_size/2);
783
784 c->options |= MIPS_CPU_CACHE_CDEX_P;
785 break;
786
787 case CPU_R5432:
788 case CPU_R5500:
789 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
790 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
791 c->icache.ways = 2;
792 c->icache.waybit= 0;
793
794 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
795 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
796 c->dcache.ways = 2;
797 c->dcache.waybit = 0;
798
799 c->options |= MIPS_CPU_CACHE_CDEX_P | MIPS_CPU_PREFETCH;
800 break;
801
802 case CPU_TX49XX:
803 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
804 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
805 c->icache.ways = 4;
806 c->icache.waybit= 0;
807
808 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
809 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
810 c->dcache.ways = 4;
811 c->dcache.waybit = 0;
812
813 c->options |= MIPS_CPU_CACHE_CDEX_P;
814 c->options |= MIPS_CPU_PREFETCH;
815 break;
816
817 case CPU_R4000PC:
818 case CPU_R4000SC:
819 case CPU_R4000MC:
820 case CPU_R4400PC:
821 case CPU_R4400SC:
822 case CPU_R4400MC:
823 case CPU_R4300:
824 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
825 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
826 c->icache.ways = 1;
827 c->icache.waybit = 0; /* doesn't matter */
828
829 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
830 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
831 c->dcache.ways = 1;
832 c->dcache.waybit = 0; /* does not matter */
833
834 c->options |= MIPS_CPU_CACHE_CDEX_P;
835 break;
836
837 case CPU_R10000:
838 case CPU_R12000:
839 case CPU_R14000:
840 icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29));
841 c->icache.linesz = 64;
842 c->icache.ways = 2;
843 c->icache.waybit = 0;
844
845 dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26));
846 c->dcache.linesz = 32;
847 c->dcache.ways = 2;
848 c->dcache.waybit = 0;
849
850 c->options |= MIPS_CPU_PREFETCH;
851 break;
852
853 case CPU_VR4133:
854 write_c0_config(config & ~VR41_CONF_P4K);
855 case CPU_VR4131:
856 /* Workaround for cache instruction bug of VR4131 */
857 if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U ||
858 c->processor_id == 0x0c82U) {
859 config |= 0x00400000U;
860 if (c->processor_id == 0x0c80U)
861 config |= VR41_CONF_BP;
862 write_c0_config(config);
863 } else
864 c->options |= MIPS_CPU_CACHE_CDEX_P;
865
866 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
867 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
868 c->icache.ways = 2;
869 c->icache.waybit = __ffs(icache_size/2);
870
871 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
872 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
873 c->dcache.ways = 2;
874 c->dcache.waybit = __ffs(dcache_size/2);
875 break;
876
877 case CPU_VR41XX:
878 case CPU_VR4111:
879 case CPU_VR4121:
880 case CPU_VR4122:
881 case CPU_VR4181:
882 case CPU_VR4181A:
883 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
884 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
885 c->icache.ways = 1;
886 c->icache.waybit = 0; /* doesn't matter */
887
888 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
889 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
890 c->dcache.ways = 1;
891 c->dcache.waybit = 0; /* does not matter */
892
893 c->options |= MIPS_CPU_CACHE_CDEX_P;
894 break;
895
896 case CPU_RM7000:
897 rm7k_erratum31();
898
899 case CPU_RM9000:
900 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
901 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
902 c->icache.ways = 4;
903 c->icache.waybit = __ffs(icache_size / c->icache.ways);
904
905 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
906 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
907 c->dcache.ways = 4;
908 c->dcache.waybit = __ffs(dcache_size / c->dcache.ways);
909
910#if !defined(CONFIG_SMP) || !defined(RM9000_CDEX_SMP_WAR)
911 c->options |= MIPS_CPU_CACHE_CDEX_P;
912#endif
913 c->options |= MIPS_CPU_PREFETCH;
914 break;
915
916 case CPU_LOONGSON2:
917 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
918 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
919 if (prid & 0x3)
920 c->icache.ways = 4;
921 else
922 c->icache.ways = 2;
923 c->icache.waybit = 0;
924
925 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
926 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
927 if (prid & 0x3)
928 c->dcache.ways = 4;
929 else
930 c->dcache.ways = 2;
931 c->dcache.waybit = 0;
932 break;
933
934 default:
935 if (!(config & MIPS_CONF_M))
936 panic("Don't know how to probe P-caches on this cpu.");
937
938 /*
939 * So we seem to be a MIPS32 or MIPS64 CPU
940 * So let's probe the I-cache ...
941 */
942 config1 = read_c0_config1();
943
944 if ((lsize = ((config1 >> 19) & 7)))
945 c->icache.linesz = 2 << lsize;
946 else
947 c->icache.linesz = lsize;
948 c->icache.sets = 64 << ((config1 >> 22) & 7);
949 c->icache.ways = 1 + ((config1 >> 16) & 7);
950
951 icache_size = c->icache.sets *
952 c->icache.ways *
953 c->icache.linesz;
954 c->icache.waybit = __ffs(icache_size/c->icache.ways);
955
956 if (config & 0x8) /* VI bit */
957 c->icache.flags |= MIPS_CACHE_VTAG;
958
959 /*
960 * Now probe the MIPS32 / MIPS64 data cache.
961 */
962 c->dcache.flags = 0;
963
964 if ((lsize = ((config1 >> 10) & 7)))
965 c->dcache.linesz = 2 << lsize;
966 else
967 c->dcache.linesz= lsize;
968 c->dcache.sets = 64 << ((config1 >> 13) & 7);
969 c->dcache.ways = 1 + ((config1 >> 7) & 7);
970
971 dcache_size = c->dcache.sets *
972 c->dcache.ways *
973 c->dcache.linesz;
974 c->dcache.waybit = __ffs(dcache_size/c->dcache.ways);
975
976 c->options |= MIPS_CPU_PREFETCH;
977 break;
978 }
979
980 /*
981 * Processor configuration sanity check for the R4000SC erratum
982 * #5. With page sizes larger than 32kB there is no possibility
983 * to get a VCE exception anymore so we don't care about this
984 * misconfiguration. The case is rather theoretical anyway;
985 * presumably no vendor is shipping his hardware in the "bad"
986 * configuration.
987 */
988 if ((prid & 0xff00) == PRID_IMP_R4000 && (prid & 0xff) < 0x40 &&
989 !(config & CONF_SC) && c->icache.linesz != 16 &&
990 PAGE_SIZE <= 0x8000)
991 panic("Improper R4000SC processor configuration detected");
992
993 /* compute a couple of other cache variables */
994 c->icache.waysize = icache_size / c->icache.ways;
995 c->dcache.waysize = dcache_size / c->dcache.ways;
996
997 c->icache.sets = c->icache.linesz ?
998 icache_size / (c->icache.linesz * c->icache.ways) : 0;
999 c->dcache.sets = c->dcache.linesz ?
1000 dcache_size / (c->dcache.linesz * c->dcache.ways) : 0;
1001
1002 /*
1003 * R10000 and R12000 P-caches are odd in a positive way. They're 32kB
1004 * 2-way virtually indexed so normally would suffer from aliases. So
1005 * normally they'd suffer from aliases but magic in the hardware deals
1006 * with that for us so we don't need to take care ourselves.
1007 */
1008 switch (c->cputype) {
1009 case CPU_20KC:
1010 case CPU_25KF:
1011 case CPU_SB1:
1012 case CPU_SB1A:
1013 case CPU_XLR:
1014 c->dcache.flags |= MIPS_CACHE_PINDEX;
1015 break;
1016
1017 case CPU_R10000:
1018 case CPU_R12000:
1019 case CPU_R14000:
1020 break;
1021
1022 case CPU_24K:
1023 case CPU_34K:
1024 case CPU_74K:
1025 case CPU_1004K:
1026 if ((read_c0_config7() & (1 << 16))) {
1027 /* effectively physically indexed dcache,
1028 thus no virtual aliases. */
1029 c->dcache.flags |= MIPS_CACHE_PINDEX;
1030 break;
1031 }
1032 default:
1033 if (c->dcache.waysize > PAGE_SIZE)
1034 c->dcache.flags |= MIPS_CACHE_ALIASES;
1035 }
1036
1037 switch (c->cputype) {
1038 case CPU_20KC:
1039 /*
1040 * Some older 20Kc chips doesn't have the 'VI' bit in
1041 * the config register.
1042 */
1043 c->icache.flags |= MIPS_CACHE_VTAG;
1044 break;
1045
1046 case CPU_ALCHEMY:
1047 c->icache.flags |= MIPS_CACHE_IC_F_DC;
1048 break;
1049 }
1050
1051#ifdef CONFIG_CPU_LOONGSON2
1052 /*
1053 * LOONGSON2 has 4 way icache, but when using indexed cache op,
1054 * one op will act on all 4 ways
1055 */
1056 c->icache.ways = 1;
1057#endif
1058
1059 printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
1060 icache_size >> 10,
1061 c->icache.flags & MIPS_CACHE_VTAG ? "VIVT" : "VIPT",
1062 way_string[c->icache.ways], c->icache.linesz);
1063
1064 printk("Primary data cache %ldkB, %s, %s, %s, linesize %d bytes\n",
1065 dcache_size >> 10, way_string[c->dcache.ways],
1066 (c->dcache.flags & MIPS_CACHE_PINDEX) ? "PIPT" : "VIPT",
1067 (c->dcache.flags & MIPS_CACHE_ALIASES) ?
1068 "cache aliases" : "no aliases",
1069 c->dcache.linesz);
1070}
1071
1072/*
1073 * If you even _breathe_ on this function, look at the gcc output and make sure
1074 * it does not pop things on and off the stack for the cache sizing loop that
1075 * executes in KSEG1 space or else you will crash and burn badly. You have
1076 * been warned.
1077 */
1078static int __cpuinit probe_scache(void)
1079{
1080 unsigned long flags, addr, begin, end, pow2;
1081 unsigned int config = read_c0_config();
1082 struct cpuinfo_mips *c = ¤t_cpu_data;
1083
1084 if (config & CONF_SC)
1085 return 0;
1086
1087 begin = (unsigned long) &_stext;
1088 begin &= ~((4 * 1024 * 1024) - 1);
1089 end = begin + (4 * 1024 * 1024);
1090
1091 /*
1092 * This is such a bitch, you'd think they would make it easy to do
1093 * this. Away you daemons of stupidity!
1094 */
1095 local_irq_save(flags);
1096
1097 /* Fill each size-multiple cache line with a valid tag. */
1098 pow2 = (64 * 1024);
1099 for (addr = begin; addr < end; addr = (begin + pow2)) {
1100 unsigned long *p = (unsigned long *) addr;
1101 __asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
1102 pow2 <<= 1;
1103 }
1104
1105 /* Load first line with zero (therefore invalid) tag. */
1106 write_c0_taglo(0);
1107 write_c0_taghi(0);
1108 __asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
1109 cache_op(Index_Store_Tag_I, begin);
1110 cache_op(Index_Store_Tag_D, begin);
1111 cache_op(Index_Store_Tag_SD, begin);
1112
1113 /* Now search for the wrap around point. */
1114 pow2 = (128 * 1024);
1115 for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) {
1116 cache_op(Index_Load_Tag_SD, addr);
1117 __asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
1118 if (!read_c0_taglo())
1119 break;
1120 pow2 <<= 1;
1121 }
1122 local_irq_restore(flags);
1123 addr -= begin;
1124
1125 scache_size = addr;
1126 c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22);
1127 c->scache.ways = 1;
1128 c->dcache.waybit = 0; /* does not matter */
1129
1130 return 1;
1131}
1132
1133#if defined(CONFIG_CPU_LOONGSON2)
1134static void __init loongson2_sc_init(void)
1135{
1136 struct cpuinfo_mips *c = ¤t_cpu_data;
1137
1138 scache_size = 512*1024;
1139 c->scache.linesz = 32;
1140 c->scache.ways = 4;
1141 c->scache.waybit = 0;
1142 c->scache.waysize = scache_size / (c->scache.ways);
1143 c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1144 pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1145 scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1146
1147 c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1148}
1149#endif
1150
1151extern int r5k_sc_init(void);
1152extern int rm7k_sc_init(void);
1153extern int mips_sc_init(void);
1154
1155static void __cpuinit setup_scache(void)
1156{
1157 struct cpuinfo_mips *c = ¤t_cpu_data;
1158 unsigned int config = read_c0_config();
1159 int sc_present = 0;
1160
1161 /*
1162 * Do the probing thing on R4000SC and R4400SC processors. Other
1163 * processors don't have a S-cache that would be relevant to the
1164 * Linux memory management.
1165 */
1166 switch (c->cputype) {
1167 case CPU_R4000SC:
1168 case CPU_R4000MC:
1169 case CPU_R4400SC:
1170 case CPU_R4400MC:
1171 sc_present = run_uncached(probe_scache);
1172 if (sc_present)
1173 c->options |= MIPS_CPU_CACHE_CDEX_S;
1174 break;
1175
1176 case CPU_R10000:
1177 case CPU_R12000:
1178 case CPU_R14000:
1179 scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16);
1180 c->scache.linesz = 64 << ((config >> 13) & 1);
1181 c->scache.ways = 2;
1182 c->scache.waybit= 0;
1183 sc_present = 1;
1184 break;
1185
1186 case CPU_R5000:
1187 case CPU_NEVADA:
1188#ifdef CONFIG_R5000_CPU_SCACHE
1189 r5k_sc_init();
1190#endif
1191 return;
1192
1193 case CPU_RM7000:
1194 case CPU_RM9000:
1195#ifdef CONFIG_RM7000_CPU_SCACHE
1196 rm7k_sc_init();
1197#endif
1198 return;
1199
1200#if defined(CONFIG_CPU_LOONGSON2)
1201 case CPU_LOONGSON2:
1202 loongson2_sc_init();
1203 return;
1204#endif
1205
1206 default:
1207 if (c->isa_level == MIPS_CPU_ISA_M32R1 ||
1208 c->isa_level == MIPS_CPU_ISA_M32R2 ||
1209 c->isa_level == MIPS_CPU_ISA_M64R1 ||
1210 c->isa_level == MIPS_CPU_ISA_M64R2) {
1211#ifdef CONFIG_MIPS_CPU_SCACHE
1212 if (mips_sc_init ()) {
1213 scache_size = c->scache.ways * c->scache.sets * c->scache.linesz;
1214 printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n",
1215 scache_size >> 10,
1216 way_string[c->scache.ways], c->scache.linesz);
1217 }
1218#else
1219 if (!(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
1220 panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
1221#endif
1222 return;
1223 }
1224 sc_present = 0;
1225 }
1226
1227 if (!sc_present)
1228 return;
1229
1230 /* compute a couple of other cache variables */
1231 c->scache.waysize = scache_size / c->scache.ways;
1232
1233 c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1234
1235 printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1236 scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1237
1238 c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1239}
1240
1241void au1x00_fixup_config_od(void)
1242{
1243 /*
1244 * c0_config.od (bit 19) was write only (and read as 0)
1245 * on the early revisions of Alchemy SOCs. It disables the bus
1246 * transaction overlapping and needs to be set to fix various errata.
1247 */
1248 switch (read_c0_prid()) {
1249 case 0x00030100: /* Au1000 DA */
1250 case 0x00030201: /* Au1000 HA */
1251 case 0x00030202: /* Au1000 HB */
1252 case 0x01030200: /* Au1500 AB */
1253 /*
1254 * Au1100 errata actually keeps silence about this bit, so we set it
1255 * just in case for those revisions that require it to be set according
1256 * to the (now gone) cpu table.
1257 */
1258 case 0x02030200: /* Au1100 AB */
1259 case 0x02030201: /* Au1100 BA */
1260 case 0x02030202: /* Au1100 BC */
1261 set_c0_config(1 << 19);
1262 break;
1263 }
1264}
1265
1266/* CP0 hazard avoidance. */
1267#define NXP_BARRIER() \
1268 __asm__ __volatile__( \
1269 ".set noreorder\n\t" \
1270 "nop; nop; nop; nop; nop; nop;\n\t" \
1271 ".set reorder\n\t")
1272
1273static void nxp_pr4450_fixup_config(void)
1274{
1275 unsigned long config0;
1276
1277 config0 = read_c0_config();
1278
1279 /* clear all three cache coherency fields */
1280 config0 &= ~(0x7 | (7 << 25) | (7 << 28));
1281 config0 |= (((_page_cachable_default >> _CACHE_SHIFT) << 0) |
1282 ((_page_cachable_default >> _CACHE_SHIFT) << 25) |
1283 ((_page_cachable_default >> _CACHE_SHIFT) << 28));
1284 write_c0_config(config0);
1285 NXP_BARRIER();
1286}
1287
1288static int __cpuinitdata cca = -1;
1289
1290static int __init cca_setup(char *str)
1291{
1292 get_option(&str, &cca);
1293
1294 return 1;
1295}
1296
1297__setup("cca=", cca_setup);
1298
1299static void __cpuinit coherency_setup(void)
1300{
1301 if (cca < 0 || cca > 7)
1302 cca = read_c0_config() & CONF_CM_CMASK;
1303 _page_cachable_default = cca << _CACHE_SHIFT;
1304
1305 pr_debug("Using cache attribute %d\n", cca);
1306 change_c0_config(CONF_CM_CMASK, cca);
1307
1308 /*
1309 * c0_status.cu=0 specifies that updates by the sc instruction use
1310 * the coherency mode specified by the TLB; 1 means cachable
1311 * coherent update on write will be used. Not all processors have
1312 * this bit and; some wire it to zero, others like Toshiba had the
1313 * silly idea of putting something else there ...
1314 */
1315 switch (current_cpu_type()) {
1316 case CPU_R4000PC:
1317 case CPU_R4000SC:
1318 case CPU_R4000MC:
1319 case CPU_R4400PC:
1320 case CPU_R4400SC:
1321 case CPU_R4400MC:
1322 clear_c0_config(CONF_CU);
1323 break;
1324 /*
1325 * We need to catch the early Alchemy SOCs with
1326 * the write-only co_config.od bit and set it back to one on:
1327 * Au1000 rev DA, HA, HB; Au1100 AB, BA, BC, Au1500 AB
1328 */
1329 case CPU_ALCHEMY:
1330 au1x00_fixup_config_od();
1331 break;
1332
1333 case PRID_IMP_PR4450:
1334 nxp_pr4450_fixup_config();
1335 break;
1336 }
1337}
1338
1339#if defined(CONFIG_DMA_NONCOHERENT)
1340
1341static int __cpuinitdata coherentio;
1342
1343static int __init setcoherentio(char *str)
1344{
1345 coherentio = 1;
1346
1347 return 1;
1348}
1349
1350__setup("coherentio", setcoherentio);
1351#endif
1352
1353void __cpuinit r4k_cache_init(void)
1354{
1355 extern void build_clear_page(void);
1356 extern void build_copy_page(void);
1357 extern char __weak except_vec2_generic;
1358 extern char __weak except_vec2_sb1;
1359 struct cpuinfo_mips *c = ¤t_cpu_data;
1360
1361 switch (c->cputype) {
1362 case CPU_SB1:
1363 case CPU_SB1A:
1364 set_uncached_handler(0x100, &except_vec2_sb1, 0x80);
1365 break;
1366
1367 default:
1368 set_uncached_handler(0x100, &except_vec2_generic, 0x80);
1369 break;
1370 }
1371
1372 probe_pcache();
1373 setup_scache();
1374
1375 r4k_blast_dcache_page_setup();
1376 r4k_blast_dcache_page_indexed_setup();
1377 r4k_blast_dcache_setup();
1378 r4k_blast_icache_page_setup();
1379 r4k_blast_icache_page_indexed_setup();
1380 r4k_blast_icache_setup();
1381 r4k_blast_scache_page_setup();
1382 r4k_blast_scache_page_indexed_setup();
1383 r4k_blast_scache_setup();
1384
1385 /*
1386 * Some MIPS32 and MIPS64 processors have physically indexed caches.
1387 * This code supports virtually indexed processors and will be
1388 * unnecessarily inefficient on physically indexed processors.
1389 */
1390 if (c->dcache.linesz)
1391 shm_align_mask = max_t( unsigned long,
1392 c->dcache.sets * c->dcache.linesz - 1,
1393 PAGE_SIZE - 1);
1394 else
1395 shm_align_mask = PAGE_SIZE-1;
1396
1397 __flush_cache_vmap = r4k__flush_cache_vmap;
1398 __flush_cache_vunmap = r4k__flush_cache_vunmap;
1399
1400 flush_cache_all = cache_noop;
1401 __flush_cache_all = r4k___flush_cache_all;
1402 flush_cache_mm = r4k_flush_cache_mm;
1403 flush_cache_page = r4k_flush_cache_page;
1404 flush_cache_range = r4k_flush_cache_range;
1405
1406 flush_cache_sigtramp = r4k_flush_cache_sigtramp;
1407 flush_icache_all = r4k_flush_icache_all;
1408 local_flush_data_cache_page = local_r4k_flush_data_cache_page;
1409 flush_data_cache_page = r4k_flush_data_cache_page;
1410 flush_icache_range = r4k_flush_icache_range;
1411 local_flush_icache_range = local_r4k_flush_icache_range;
1412
1413#if defined(CONFIG_DMA_NONCOHERENT)
1414 if (coherentio) {
1415 _dma_cache_wback_inv = (void *)cache_noop;
1416 _dma_cache_wback = (void *)cache_noop;
1417 _dma_cache_inv = (void *)cache_noop;
1418 } else {
1419 _dma_cache_wback_inv = r4k_dma_cache_wback_inv;
1420 _dma_cache_wback = r4k_dma_cache_wback_inv;
1421 _dma_cache_inv = r4k_dma_cache_inv;
1422 }
1423#endif
1424
1425 build_clear_page();
1426 build_copy_page();
1427#if !defined(CONFIG_MIPS_CMP)
1428 local_r4k___flush_cache_all(NULL);
1429#endif
1430 coherency_setup();
1431}
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
7 * Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Ralf Baechle (ralf@gnu.org)
8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
9 */
10#include <linux/cpu_pm.h>
11#include <linux/hardirq.h>
12#include <linux/init.h>
13#include <linux/highmem.h>
14#include <linux/kernel.h>
15#include <linux/linkage.h>
16#include <linux/preempt.h>
17#include <linux/sched.h>
18#include <linux/smp.h>
19#include <linux/mm.h>
20#include <linux/export.h>
21#include <linux/bitops.h>
22
23#include <asm/bcache.h>
24#include <asm/bootinfo.h>
25#include <asm/cache.h>
26#include <asm/cacheops.h>
27#include <asm/cpu.h>
28#include <asm/cpu-features.h>
29#include <asm/cpu-type.h>
30#include <asm/io.h>
31#include <asm/page.h>
32#include <asm/r4kcache.h>
33#include <asm/sections.h>
34#include <asm/mmu_context.h>
35#include <asm/war.h>
36#include <asm/cacheflush.h> /* for run_uncached() */
37#include <asm/traps.h>
38#include <asm/dma-coherence.h>
39#include <asm/mips-cps.h>
40
41/*
42 * Bits describing what cache ops an SMP callback function may perform.
43 *
44 * R4K_HIT - Virtual user or kernel address based cache operations. The
45 * active_mm must be checked before using user addresses, falling
46 * back to kmap.
47 * R4K_INDEX - Index based cache operations.
48 */
49
50#define R4K_HIT BIT(0)
51#define R4K_INDEX BIT(1)
52
53/**
54 * r4k_op_needs_ipi() - Decide if a cache op needs to be done on every core.
55 * @type: Type of cache operations (R4K_HIT or R4K_INDEX).
56 *
57 * Decides whether a cache op needs to be performed on every core in the system.
58 * This may change depending on the @type of cache operation, as well as the set
59 * of online CPUs, so preemption should be disabled by the caller to prevent CPU
60 * hotplug from changing the result.
61 *
62 * Returns: 1 if the cache operation @type should be done on every core in
63 * the system.
64 * 0 if the cache operation @type is globalized and only needs to
65 * be performed on a simple CPU.
66 */
67static inline bool r4k_op_needs_ipi(unsigned int type)
68{
69 /* The MIPS Coherence Manager (CM) globalizes address-based cache ops */
70 if (type == R4K_HIT && mips_cm_present())
71 return false;
72
73 /*
74 * Hardware doesn't globalize the required cache ops, so SMP calls may
75 * be needed, but only if there are foreign CPUs (non-siblings with
76 * separate caches).
77 */
78 /* cpu_foreign_map[] undeclared when !CONFIG_SMP */
79#ifdef CONFIG_SMP
80 return !cpumask_empty(&cpu_foreign_map[0]);
81#else
82 return false;
83#endif
84}
85
86/*
87 * Special Variant of smp_call_function for use by cache functions:
88 *
89 * o No return value
90 * o collapses to normal function call on UP kernels
91 * o collapses to normal function call on systems with a single shared
92 * primary cache.
93 * o doesn't disable interrupts on the local CPU
94 */
95static inline void r4k_on_each_cpu(unsigned int type,
96 void (*func)(void *info), void *info)
97{
98 preempt_disable();
99 if (r4k_op_needs_ipi(type))
100 smp_call_function_many(&cpu_foreign_map[smp_processor_id()],
101 func, info, 1);
102 func(info);
103 preempt_enable();
104}
105
106/*
107 * Must die.
108 */
109static unsigned long icache_size __read_mostly;
110static unsigned long dcache_size __read_mostly;
111static unsigned long vcache_size __read_mostly;
112static unsigned long scache_size __read_mostly;
113
114/*
115 * Dummy cache handling routines for machines without boardcaches
116 */
117static void cache_noop(void) {}
118
119static struct bcache_ops no_sc_ops = {
120 .bc_enable = (void *)cache_noop,
121 .bc_disable = (void *)cache_noop,
122 .bc_wback_inv = (void *)cache_noop,
123 .bc_inv = (void *)cache_noop
124};
125
126struct bcache_ops *bcops = &no_sc_ops;
127
128#define cpu_is_r4600_v1_x() ((read_c0_prid() & 0xfffffff0) == 0x00002010)
129#define cpu_is_r4600_v2_x() ((read_c0_prid() & 0xfffffff0) == 0x00002020)
130
131#define R4600_HIT_CACHEOP_WAR_IMPL \
132do { \
133 if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x()) \
134 *(volatile unsigned long *)CKSEG1; \
135 if (R4600_V1_HIT_CACHEOP_WAR) \
136 __asm__ __volatile__("nop;nop;nop;nop"); \
137} while (0)
138
139static void (*r4k_blast_dcache_page)(unsigned long addr);
140
141static inline void r4k_blast_dcache_page_dc32(unsigned long addr)
142{
143 R4600_HIT_CACHEOP_WAR_IMPL;
144 blast_dcache32_page(addr);
145}
146
147static inline void r4k_blast_dcache_page_dc64(unsigned long addr)
148{
149 blast_dcache64_page(addr);
150}
151
152static inline void r4k_blast_dcache_page_dc128(unsigned long addr)
153{
154 blast_dcache128_page(addr);
155}
156
157static void r4k_blast_dcache_page_setup(void)
158{
159 unsigned long dc_lsize = cpu_dcache_line_size();
160
161 switch (dc_lsize) {
162 case 0:
163 r4k_blast_dcache_page = (void *)cache_noop;
164 break;
165 case 16:
166 r4k_blast_dcache_page = blast_dcache16_page;
167 break;
168 case 32:
169 r4k_blast_dcache_page = r4k_blast_dcache_page_dc32;
170 break;
171 case 64:
172 r4k_blast_dcache_page = r4k_blast_dcache_page_dc64;
173 break;
174 case 128:
175 r4k_blast_dcache_page = r4k_blast_dcache_page_dc128;
176 break;
177 default:
178 break;
179 }
180}
181
182#ifndef CONFIG_EVA
183#define r4k_blast_dcache_user_page r4k_blast_dcache_page
184#else
185
186static void (*r4k_blast_dcache_user_page)(unsigned long addr);
187
188static void r4k_blast_dcache_user_page_setup(void)
189{
190 unsigned long dc_lsize = cpu_dcache_line_size();
191
192 if (dc_lsize == 0)
193 r4k_blast_dcache_user_page = (void *)cache_noop;
194 else if (dc_lsize == 16)
195 r4k_blast_dcache_user_page = blast_dcache16_user_page;
196 else if (dc_lsize == 32)
197 r4k_blast_dcache_user_page = blast_dcache32_user_page;
198 else if (dc_lsize == 64)
199 r4k_blast_dcache_user_page = blast_dcache64_user_page;
200}
201
202#endif
203
204static void (* r4k_blast_dcache_page_indexed)(unsigned long addr);
205
206static void r4k_blast_dcache_page_indexed_setup(void)
207{
208 unsigned long dc_lsize = cpu_dcache_line_size();
209
210 if (dc_lsize == 0)
211 r4k_blast_dcache_page_indexed = (void *)cache_noop;
212 else if (dc_lsize == 16)
213 r4k_blast_dcache_page_indexed = blast_dcache16_page_indexed;
214 else if (dc_lsize == 32)
215 r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed;
216 else if (dc_lsize == 64)
217 r4k_blast_dcache_page_indexed = blast_dcache64_page_indexed;
218 else if (dc_lsize == 128)
219 r4k_blast_dcache_page_indexed = blast_dcache128_page_indexed;
220}
221
222void (* r4k_blast_dcache)(void);
223EXPORT_SYMBOL(r4k_blast_dcache);
224
225static void r4k_blast_dcache_setup(void)
226{
227 unsigned long dc_lsize = cpu_dcache_line_size();
228
229 if (dc_lsize == 0)
230 r4k_blast_dcache = (void *)cache_noop;
231 else if (dc_lsize == 16)
232 r4k_blast_dcache = blast_dcache16;
233 else if (dc_lsize == 32)
234 r4k_blast_dcache = blast_dcache32;
235 else if (dc_lsize == 64)
236 r4k_blast_dcache = blast_dcache64;
237 else if (dc_lsize == 128)
238 r4k_blast_dcache = blast_dcache128;
239}
240
241/* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
242#define JUMP_TO_ALIGN(order) \
243 __asm__ __volatile__( \
244 "b\t1f\n\t" \
245 ".align\t" #order "\n\t" \
246 "1:\n\t" \
247 )
248#define CACHE32_UNROLL32_ALIGN JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
249#define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
250
251static inline void blast_r4600_v1_icache32(void)
252{
253 unsigned long flags;
254
255 local_irq_save(flags);
256 blast_icache32();
257 local_irq_restore(flags);
258}
259
260static inline void tx49_blast_icache32(void)
261{
262 unsigned long start = INDEX_BASE;
263 unsigned long end = start + current_cpu_data.icache.waysize;
264 unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
265 unsigned long ws_end = current_cpu_data.icache.ways <<
266 current_cpu_data.icache.waybit;
267 unsigned long ws, addr;
268
269 CACHE32_UNROLL32_ALIGN2;
270 /* I'm in even chunk. blast odd chunks */
271 for (ws = 0; ws < ws_end; ws += ws_inc)
272 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
273 cache_unroll(32, kernel_cache, Index_Invalidate_I,
274 addr | ws, 32);
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 cache_unroll(32, kernel_cache, Index_Invalidate_I,
280 addr | ws, 32);
281}
282
283static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page)
284{
285 unsigned long flags;
286
287 local_irq_save(flags);
288 blast_icache32_page_indexed(page);
289 local_irq_restore(flags);
290}
291
292static inline void tx49_blast_icache32_page_indexed(unsigned long page)
293{
294 unsigned long indexmask = current_cpu_data.icache.waysize - 1;
295 unsigned long start = INDEX_BASE + (page & indexmask);
296 unsigned long end = start + PAGE_SIZE;
297 unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
298 unsigned long ws_end = current_cpu_data.icache.ways <<
299 current_cpu_data.icache.waybit;
300 unsigned long ws, addr;
301
302 CACHE32_UNROLL32_ALIGN2;
303 /* I'm in even chunk. blast odd chunks */
304 for (ws = 0; ws < ws_end; ws += ws_inc)
305 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
306 cache_unroll(32, kernel_cache, Index_Invalidate_I,
307 addr | ws, 32);
308 CACHE32_UNROLL32_ALIGN;
309 /* I'm in odd chunk. blast even chunks */
310 for (ws = 0; ws < ws_end; ws += ws_inc)
311 for (addr = start; addr < end; addr += 0x400 * 2)
312 cache_unroll(32, kernel_cache, Index_Invalidate_I,
313 addr | ws, 32);
314}
315
316static void (* r4k_blast_icache_page)(unsigned long addr);
317
318static void r4k_blast_icache_page_setup(void)
319{
320 unsigned long ic_lsize = cpu_icache_line_size();
321
322 if (ic_lsize == 0)
323 r4k_blast_icache_page = (void *)cache_noop;
324 else if (ic_lsize == 16)
325 r4k_blast_icache_page = blast_icache16_page;
326 else if (ic_lsize == 32 && current_cpu_type() == CPU_LOONGSON2EF)
327 r4k_blast_icache_page = loongson2_blast_icache32_page;
328 else if (ic_lsize == 32)
329 r4k_blast_icache_page = blast_icache32_page;
330 else if (ic_lsize == 64)
331 r4k_blast_icache_page = blast_icache64_page;
332 else if (ic_lsize == 128)
333 r4k_blast_icache_page = blast_icache128_page;
334}
335
336#ifndef CONFIG_EVA
337#define r4k_blast_icache_user_page r4k_blast_icache_page
338#else
339
340static void (*r4k_blast_icache_user_page)(unsigned long addr);
341
342static void r4k_blast_icache_user_page_setup(void)
343{
344 unsigned long ic_lsize = cpu_icache_line_size();
345
346 if (ic_lsize == 0)
347 r4k_blast_icache_user_page = (void *)cache_noop;
348 else if (ic_lsize == 16)
349 r4k_blast_icache_user_page = blast_icache16_user_page;
350 else if (ic_lsize == 32)
351 r4k_blast_icache_user_page = blast_icache32_user_page;
352 else if (ic_lsize == 64)
353 r4k_blast_icache_user_page = blast_icache64_user_page;
354}
355
356#endif
357
358static void (* r4k_blast_icache_page_indexed)(unsigned long addr);
359
360static void r4k_blast_icache_page_indexed_setup(void)
361{
362 unsigned long ic_lsize = cpu_icache_line_size();
363
364 if (ic_lsize == 0)
365 r4k_blast_icache_page_indexed = (void *)cache_noop;
366 else if (ic_lsize == 16)
367 r4k_blast_icache_page_indexed = blast_icache16_page_indexed;
368 else if (ic_lsize == 32) {
369 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
370 r4k_blast_icache_page_indexed =
371 blast_icache32_r4600_v1_page_indexed;
372 else if (TX49XX_ICACHE_INDEX_INV_WAR)
373 r4k_blast_icache_page_indexed =
374 tx49_blast_icache32_page_indexed;
375 else if (current_cpu_type() == CPU_LOONGSON2EF)
376 r4k_blast_icache_page_indexed =
377 loongson2_blast_icache32_page_indexed;
378 else
379 r4k_blast_icache_page_indexed =
380 blast_icache32_page_indexed;
381 } else if (ic_lsize == 64)
382 r4k_blast_icache_page_indexed = blast_icache64_page_indexed;
383}
384
385void (* r4k_blast_icache)(void);
386EXPORT_SYMBOL(r4k_blast_icache);
387
388static void r4k_blast_icache_setup(void)
389{
390 unsigned long ic_lsize = cpu_icache_line_size();
391
392 if (ic_lsize == 0)
393 r4k_blast_icache = (void *)cache_noop;
394 else if (ic_lsize == 16)
395 r4k_blast_icache = blast_icache16;
396 else if (ic_lsize == 32) {
397 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
398 r4k_blast_icache = blast_r4600_v1_icache32;
399 else if (TX49XX_ICACHE_INDEX_INV_WAR)
400 r4k_blast_icache = tx49_blast_icache32;
401 else if (current_cpu_type() == CPU_LOONGSON2EF)
402 r4k_blast_icache = loongson2_blast_icache32;
403 else
404 r4k_blast_icache = blast_icache32;
405 } else if (ic_lsize == 64)
406 r4k_blast_icache = blast_icache64;
407 else if (ic_lsize == 128)
408 r4k_blast_icache = blast_icache128;
409}
410
411static void (* r4k_blast_scache_page)(unsigned long addr);
412
413static void r4k_blast_scache_page_setup(void)
414{
415 unsigned long sc_lsize = cpu_scache_line_size();
416
417 if (scache_size == 0)
418 r4k_blast_scache_page = (void *)cache_noop;
419 else if (sc_lsize == 16)
420 r4k_blast_scache_page = blast_scache16_page;
421 else if (sc_lsize == 32)
422 r4k_blast_scache_page = blast_scache32_page;
423 else if (sc_lsize == 64)
424 r4k_blast_scache_page = blast_scache64_page;
425 else if (sc_lsize == 128)
426 r4k_blast_scache_page = blast_scache128_page;
427}
428
429static void (* r4k_blast_scache_page_indexed)(unsigned long addr);
430
431static void r4k_blast_scache_page_indexed_setup(void)
432{
433 unsigned long sc_lsize = cpu_scache_line_size();
434
435 if (scache_size == 0)
436 r4k_blast_scache_page_indexed = (void *)cache_noop;
437 else if (sc_lsize == 16)
438 r4k_blast_scache_page_indexed = blast_scache16_page_indexed;
439 else if (sc_lsize == 32)
440 r4k_blast_scache_page_indexed = blast_scache32_page_indexed;
441 else if (sc_lsize == 64)
442 r4k_blast_scache_page_indexed = blast_scache64_page_indexed;
443 else if (sc_lsize == 128)
444 r4k_blast_scache_page_indexed = blast_scache128_page_indexed;
445}
446
447static void (* r4k_blast_scache)(void);
448
449static void r4k_blast_scache_setup(void)
450{
451 unsigned long sc_lsize = cpu_scache_line_size();
452
453 if (scache_size == 0)
454 r4k_blast_scache = (void *)cache_noop;
455 else if (sc_lsize == 16)
456 r4k_blast_scache = blast_scache16;
457 else if (sc_lsize == 32)
458 r4k_blast_scache = blast_scache32;
459 else if (sc_lsize == 64)
460 r4k_blast_scache = blast_scache64;
461 else if (sc_lsize == 128)
462 r4k_blast_scache = blast_scache128;
463}
464
465static void (*r4k_blast_scache_node)(long node);
466
467static void r4k_blast_scache_node_setup(void)
468{
469 unsigned long sc_lsize = cpu_scache_line_size();
470
471 if (current_cpu_type() != CPU_LOONGSON64)
472 r4k_blast_scache_node = (void *)cache_noop;
473 else if (sc_lsize == 16)
474 r4k_blast_scache_node = blast_scache16_node;
475 else if (sc_lsize == 32)
476 r4k_blast_scache_node = blast_scache32_node;
477 else if (sc_lsize == 64)
478 r4k_blast_scache_node = blast_scache64_node;
479 else if (sc_lsize == 128)
480 r4k_blast_scache_node = blast_scache128_node;
481}
482
483static inline void local_r4k___flush_cache_all(void * args)
484{
485 switch (current_cpu_type()) {
486 case CPU_LOONGSON2EF:
487 case CPU_R4000SC:
488 case CPU_R4000MC:
489 case CPU_R4400SC:
490 case CPU_R4400MC:
491 case CPU_R10000:
492 case CPU_R12000:
493 case CPU_R14000:
494 case CPU_R16000:
495 /*
496 * These caches are inclusive caches, that is, if something
497 * is not cached in the S-cache, we know it also won't be
498 * in one of the primary caches.
499 */
500 r4k_blast_scache();
501 break;
502
503 case CPU_LOONGSON64:
504 /* Use get_ebase_cpunum() for both NUMA=y/n */
505 r4k_blast_scache_node(get_ebase_cpunum() >> 2);
506 break;
507
508 case CPU_BMIPS5000:
509 r4k_blast_scache();
510 __sync();
511 break;
512
513 default:
514 r4k_blast_dcache();
515 r4k_blast_icache();
516 break;
517 }
518}
519
520static void r4k___flush_cache_all(void)
521{
522 r4k_on_each_cpu(R4K_INDEX, local_r4k___flush_cache_all, NULL);
523}
524
525/**
526 * has_valid_asid() - Determine if an mm already has an ASID.
527 * @mm: Memory map.
528 * @type: R4K_HIT or R4K_INDEX, type of cache op.
529 *
530 * Determines whether @mm already has an ASID on any of the CPUs which cache ops
531 * of type @type within an r4k_on_each_cpu() call will affect. If
532 * r4k_on_each_cpu() does an SMP call to a single VPE in each core, then the
533 * scope of the operation is confined to sibling CPUs, otherwise all online CPUs
534 * will need to be checked.
535 *
536 * Must be called in non-preemptive context.
537 *
538 * Returns: 1 if the CPUs affected by @type cache ops have an ASID for @mm.
539 * 0 otherwise.
540 */
541static inline int has_valid_asid(const struct mm_struct *mm, unsigned int type)
542{
543 unsigned int i;
544 const cpumask_t *mask = cpu_present_mask;
545
546 if (cpu_has_mmid)
547 return cpu_context(0, mm) != 0;
548
549 /* cpu_sibling_map[] undeclared when !CONFIG_SMP */
550#ifdef CONFIG_SMP
551 /*
552 * If r4k_on_each_cpu does SMP calls, it does them to a single VPE in
553 * each foreign core, so we only need to worry about siblings.
554 * Otherwise we need to worry about all present CPUs.
555 */
556 if (r4k_op_needs_ipi(type))
557 mask = &cpu_sibling_map[smp_processor_id()];
558#endif
559 for_each_cpu(i, mask)
560 if (cpu_context(i, mm))
561 return 1;
562 return 0;
563}
564
565static void r4k__flush_cache_vmap(void)
566{
567 r4k_blast_dcache();
568}
569
570static void r4k__flush_cache_vunmap(void)
571{
572 r4k_blast_dcache();
573}
574
575/*
576 * Note: flush_tlb_range() assumes flush_cache_range() sufficiently flushes
577 * whole caches when vma is executable.
578 */
579static inline void local_r4k_flush_cache_range(void * args)
580{
581 struct vm_area_struct *vma = args;
582 int exec = vma->vm_flags & VM_EXEC;
583
584 if (!has_valid_asid(vma->vm_mm, R4K_INDEX))
585 return;
586
587 /*
588 * If dcache can alias, we must blast it since mapping is changing.
589 * If executable, we must ensure any dirty lines are written back far
590 * enough to be visible to icache.
591 */
592 if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc))
593 r4k_blast_dcache();
594 /* If executable, blast stale lines from icache */
595 if (exec)
596 r4k_blast_icache();
597}
598
599static void r4k_flush_cache_range(struct vm_area_struct *vma,
600 unsigned long start, unsigned long end)
601{
602 int exec = vma->vm_flags & VM_EXEC;
603
604 if (cpu_has_dc_aliases || exec)
605 r4k_on_each_cpu(R4K_INDEX, local_r4k_flush_cache_range, vma);
606}
607
608static inline void local_r4k_flush_cache_mm(void * args)
609{
610 struct mm_struct *mm = args;
611
612 if (!has_valid_asid(mm, R4K_INDEX))
613 return;
614
615 /*
616 * Kludge alert. For obscure reasons R4000SC and R4400SC go nuts if we
617 * only flush the primary caches but R1x000 behave sane ...
618 * R4000SC and R4400SC indexed S-cache ops also invalidate primary
619 * caches, so we can bail out early.
620 */
621 if (current_cpu_type() == CPU_R4000SC ||
622 current_cpu_type() == CPU_R4000MC ||
623 current_cpu_type() == CPU_R4400SC ||
624 current_cpu_type() == CPU_R4400MC) {
625 r4k_blast_scache();
626 return;
627 }
628
629 r4k_blast_dcache();
630}
631
632static void r4k_flush_cache_mm(struct mm_struct *mm)
633{
634 if (!cpu_has_dc_aliases)
635 return;
636
637 r4k_on_each_cpu(R4K_INDEX, local_r4k_flush_cache_mm, mm);
638}
639
640struct flush_cache_page_args {
641 struct vm_area_struct *vma;
642 unsigned long addr;
643 unsigned long pfn;
644};
645
646static inline void local_r4k_flush_cache_page(void *args)
647{
648 struct flush_cache_page_args *fcp_args = args;
649 struct vm_area_struct *vma = fcp_args->vma;
650 unsigned long addr = fcp_args->addr;
651 struct page *page = pfn_to_page(fcp_args->pfn);
652 int exec = vma->vm_flags & VM_EXEC;
653 struct mm_struct *mm = vma->vm_mm;
654 int map_coherent = 0;
655 pmd_t *pmdp;
656 pte_t *ptep;
657 void *vaddr;
658
659 /*
660 * If owns no valid ASID yet, cannot possibly have gotten
661 * this page into the cache.
662 */
663 if (!has_valid_asid(mm, R4K_HIT))
664 return;
665
666 addr &= PAGE_MASK;
667 pmdp = pmd_off(mm, addr);
668 ptep = pte_offset_kernel(pmdp, addr);
669
670 /*
671 * If the page isn't marked valid, the page cannot possibly be
672 * in the cache.
673 */
674 if (!(pte_present(*ptep)))
675 return;
676
677 if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID))
678 vaddr = NULL;
679 else {
680 /*
681 * Use kmap_coherent or kmap_atomic to do flushes for
682 * another ASID than the current one.
683 */
684 map_coherent = (cpu_has_dc_aliases &&
685 page_mapcount(page) &&
686 !Page_dcache_dirty(page));
687 if (map_coherent)
688 vaddr = kmap_coherent(page, addr);
689 else
690 vaddr = kmap_atomic(page);
691 addr = (unsigned long)vaddr;
692 }
693
694 if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
695 vaddr ? r4k_blast_dcache_page(addr) :
696 r4k_blast_dcache_user_page(addr);
697 if (exec && !cpu_icache_snoops_remote_store)
698 r4k_blast_scache_page(addr);
699 }
700 if (exec) {
701 if (vaddr && cpu_has_vtag_icache && mm == current->active_mm) {
702 drop_mmu_context(mm);
703 } else
704 vaddr ? r4k_blast_icache_page(addr) :
705 r4k_blast_icache_user_page(addr);
706 }
707
708 if (vaddr) {
709 if (map_coherent)
710 kunmap_coherent();
711 else
712 kunmap_atomic(vaddr);
713 }
714}
715
716static void r4k_flush_cache_page(struct vm_area_struct *vma,
717 unsigned long addr, unsigned long pfn)
718{
719 struct flush_cache_page_args args;
720
721 args.vma = vma;
722 args.addr = addr;
723 args.pfn = pfn;
724
725 r4k_on_each_cpu(R4K_HIT, local_r4k_flush_cache_page, &args);
726}
727
728static inline void local_r4k_flush_data_cache_page(void * addr)
729{
730 r4k_blast_dcache_page((unsigned long) addr);
731}
732
733static void r4k_flush_data_cache_page(unsigned long addr)
734{
735 if (in_atomic())
736 local_r4k_flush_data_cache_page((void *)addr);
737 else
738 r4k_on_each_cpu(R4K_HIT, local_r4k_flush_data_cache_page,
739 (void *) addr);
740}
741
742struct flush_icache_range_args {
743 unsigned long start;
744 unsigned long end;
745 unsigned int type;
746 bool user;
747};
748
749static inline void __local_r4k_flush_icache_range(unsigned long start,
750 unsigned long end,
751 unsigned int type,
752 bool user)
753{
754 if (!cpu_has_ic_fills_f_dc) {
755 if (type == R4K_INDEX ||
756 (type & R4K_INDEX && end - start >= dcache_size)) {
757 r4k_blast_dcache();
758 } else {
759 R4600_HIT_CACHEOP_WAR_IMPL;
760 if (user)
761 protected_blast_dcache_range(start, end);
762 else
763 blast_dcache_range(start, end);
764 }
765 }
766
767 if (type == R4K_INDEX ||
768 (type & R4K_INDEX && end - start > icache_size))
769 r4k_blast_icache();
770 else {
771 switch (boot_cpu_type()) {
772 case CPU_LOONGSON2EF:
773 protected_loongson2_blast_icache_range(start, end);
774 break;
775
776 default:
777 if (user)
778 protected_blast_icache_range(start, end);
779 else
780 blast_icache_range(start, end);
781 break;
782 }
783 }
784}
785
786static inline void local_r4k_flush_icache_range(unsigned long start,
787 unsigned long end)
788{
789 __local_r4k_flush_icache_range(start, end, R4K_HIT | R4K_INDEX, false);
790}
791
792static inline void local_r4k_flush_icache_user_range(unsigned long start,
793 unsigned long end)
794{
795 __local_r4k_flush_icache_range(start, end, R4K_HIT | R4K_INDEX, true);
796}
797
798static inline void local_r4k_flush_icache_range_ipi(void *args)
799{
800 struct flush_icache_range_args *fir_args = args;
801 unsigned long start = fir_args->start;
802 unsigned long end = fir_args->end;
803 unsigned int type = fir_args->type;
804 bool user = fir_args->user;
805
806 __local_r4k_flush_icache_range(start, end, type, user);
807}
808
809static void __r4k_flush_icache_range(unsigned long start, unsigned long end,
810 bool user)
811{
812 struct flush_icache_range_args args;
813 unsigned long size, cache_size;
814
815 args.start = start;
816 args.end = end;
817 args.type = R4K_HIT | R4K_INDEX;
818 args.user = user;
819
820 /*
821 * Indexed cache ops require an SMP call.
822 * Consider if that can or should be avoided.
823 */
824 preempt_disable();
825 if (r4k_op_needs_ipi(R4K_INDEX) && !r4k_op_needs_ipi(R4K_HIT)) {
826 /*
827 * If address-based cache ops don't require an SMP call, then
828 * use them exclusively for small flushes.
829 */
830 size = end - start;
831 cache_size = icache_size;
832 if (!cpu_has_ic_fills_f_dc) {
833 size *= 2;
834 cache_size += dcache_size;
835 }
836 if (size <= cache_size)
837 args.type &= ~R4K_INDEX;
838 }
839 r4k_on_each_cpu(args.type, local_r4k_flush_icache_range_ipi, &args);
840 preempt_enable();
841 instruction_hazard();
842}
843
844static void r4k_flush_icache_range(unsigned long start, unsigned long end)
845{
846 return __r4k_flush_icache_range(start, end, false);
847}
848
849static void r4k_flush_icache_user_range(unsigned long start, unsigned long end)
850{
851 return __r4k_flush_icache_range(start, end, true);
852}
853
854#ifdef CONFIG_DMA_NONCOHERENT
855
856static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
857{
858 /* Catch bad driver code */
859 if (WARN_ON(size == 0))
860 return;
861
862 preempt_disable();
863 if (cpu_has_inclusive_pcaches) {
864 if (size >= scache_size) {
865 if (current_cpu_type() != CPU_LOONGSON64)
866 r4k_blast_scache();
867 else
868 r4k_blast_scache_node(pa_to_nid(addr));
869 } else {
870 blast_scache_range(addr, addr + size);
871 }
872 preempt_enable();
873 __sync();
874 return;
875 }
876
877 /*
878 * Either no secondary cache or the available caches don't have the
879 * subset property so we have to flush the primary caches
880 * explicitly.
881 * If we would need IPI to perform an INDEX-type operation, then
882 * we have to use the HIT-type alternative as IPI cannot be used
883 * here due to interrupts possibly being disabled.
884 */
885 if (!r4k_op_needs_ipi(R4K_INDEX) && size >= dcache_size) {
886 r4k_blast_dcache();
887 } else {
888 R4600_HIT_CACHEOP_WAR_IMPL;
889 blast_dcache_range(addr, addr + size);
890 }
891 preempt_enable();
892
893 bc_wback_inv(addr, size);
894 __sync();
895}
896
897static void prefetch_cache_inv(unsigned long addr, unsigned long size)
898{
899 unsigned int linesz = cpu_scache_line_size();
900 unsigned long addr0 = addr, addr1;
901
902 addr0 &= ~(linesz - 1);
903 addr1 = (addr0 + size - 1) & ~(linesz - 1);
904
905 protected_writeback_scache_line(addr0);
906 if (likely(addr1 != addr0))
907 protected_writeback_scache_line(addr1);
908 else
909 return;
910
911 addr0 += linesz;
912 if (likely(addr1 != addr0))
913 protected_writeback_scache_line(addr0);
914 else
915 return;
916
917 addr1 -= linesz;
918 if (likely(addr1 > addr0))
919 protected_writeback_scache_line(addr0);
920}
921
922static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
923{
924 /* Catch bad driver code */
925 if (WARN_ON(size == 0))
926 return;
927
928 preempt_disable();
929
930 if (current_cpu_type() == CPU_BMIPS5000)
931 prefetch_cache_inv(addr, size);
932
933 if (cpu_has_inclusive_pcaches) {
934 if (size >= scache_size) {
935 if (current_cpu_type() != CPU_LOONGSON64)
936 r4k_blast_scache();
937 else
938 r4k_blast_scache_node(pa_to_nid(addr));
939 } else {
940 /*
941 * There is no clearly documented alignment requirement
942 * for the cache instruction on MIPS processors and
943 * some processors, among them the RM5200 and RM7000
944 * QED processors will throw an address error for cache
945 * hit ops with insufficient alignment. Solved by
946 * aligning the address to cache line size.
947 */
948 blast_inv_scache_range(addr, addr + size);
949 }
950 preempt_enable();
951 __sync();
952 return;
953 }
954
955 if (!r4k_op_needs_ipi(R4K_INDEX) && size >= dcache_size) {
956 r4k_blast_dcache();
957 } else {
958 R4600_HIT_CACHEOP_WAR_IMPL;
959 blast_inv_dcache_range(addr, addr + size);
960 }
961 preempt_enable();
962
963 bc_inv(addr, size);
964 __sync();
965}
966#endif /* CONFIG_DMA_NONCOHERENT */
967
968static void r4k_flush_icache_all(void)
969{
970 if (cpu_has_vtag_icache)
971 r4k_blast_icache();
972}
973
974struct flush_kernel_vmap_range_args {
975 unsigned long vaddr;
976 int size;
977};
978
979static inline void local_r4k_flush_kernel_vmap_range_index(void *args)
980{
981 /*
982 * Aliases only affect the primary caches so don't bother with
983 * S-caches or T-caches.
984 */
985 r4k_blast_dcache();
986}
987
988static inline void local_r4k_flush_kernel_vmap_range(void *args)
989{
990 struct flush_kernel_vmap_range_args *vmra = args;
991 unsigned long vaddr = vmra->vaddr;
992 int size = vmra->size;
993
994 /*
995 * Aliases only affect the primary caches so don't bother with
996 * S-caches or T-caches.
997 */
998 R4600_HIT_CACHEOP_WAR_IMPL;
999 blast_dcache_range(vaddr, vaddr + size);
1000}
1001
1002static void r4k_flush_kernel_vmap_range(unsigned long vaddr, int size)
1003{
1004 struct flush_kernel_vmap_range_args args;
1005
1006 args.vaddr = (unsigned long) vaddr;
1007 args.size = size;
1008
1009 if (size >= dcache_size)
1010 r4k_on_each_cpu(R4K_INDEX,
1011 local_r4k_flush_kernel_vmap_range_index, NULL);
1012 else
1013 r4k_on_each_cpu(R4K_HIT, local_r4k_flush_kernel_vmap_range,
1014 &args);
1015}
1016
1017static inline void rm7k_erratum31(void)
1018{
1019 const unsigned long ic_lsize = 32;
1020 unsigned long addr;
1021
1022 /* RM7000 erratum #31. The icache is screwed at startup. */
1023 write_c0_taglo(0);
1024 write_c0_taghi(0);
1025
1026 for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) {
1027 __asm__ __volatile__ (
1028 ".set push\n\t"
1029 ".set noreorder\n\t"
1030 ".set mips3\n\t"
1031 "cache\t%1, 0(%0)\n\t"
1032 "cache\t%1, 0x1000(%0)\n\t"
1033 "cache\t%1, 0x2000(%0)\n\t"
1034 "cache\t%1, 0x3000(%0)\n\t"
1035 "cache\t%2, 0(%0)\n\t"
1036 "cache\t%2, 0x1000(%0)\n\t"
1037 "cache\t%2, 0x2000(%0)\n\t"
1038 "cache\t%2, 0x3000(%0)\n\t"
1039 "cache\t%1, 0(%0)\n\t"
1040 "cache\t%1, 0x1000(%0)\n\t"
1041 "cache\t%1, 0x2000(%0)\n\t"
1042 "cache\t%1, 0x3000(%0)\n\t"
1043 ".set pop\n"
1044 :
1045 : "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill_I));
1046 }
1047}
1048
1049static inline int alias_74k_erratum(struct cpuinfo_mips *c)
1050{
1051 unsigned int imp = c->processor_id & PRID_IMP_MASK;
1052 unsigned int rev = c->processor_id & PRID_REV_MASK;
1053 int present = 0;
1054
1055 /*
1056 * Early versions of the 74K do not update the cache tags on a
1057 * vtag miss/ptag hit which can occur in the case of KSEG0/KUSEG
1058 * aliases. In this case it is better to treat the cache as always
1059 * having aliases. Also disable the synonym tag update feature
1060 * where available. In this case no opportunistic tag update will
1061 * happen where a load causes a virtual address miss but a physical
1062 * address hit during a D-cache look-up.
1063 */
1064 switch (imp) {
1065 case PRID_IMP_74K:
1066 if (rev <= PRID_REV_ENCODE_332(2, 4, 0))
1067 present = 1;
1068 if (rev == PRID_REV_ENCODE_332(2, 4, 0))
1069 write_c0_config6(read_c0_config6() | MTI_CONF6_SYND);
1070 break;
1071 case PRID_IMP_1074K:
1072 if (rev <= PRID_REV_ENCODE_332(1, 1, 0)) {
1073 present = 1;
1074 write_c0_config6(read_c0_config6() | MTI_CONF6_SYND);
1075 }
1076 break;
1077 default:
1078 BUG();
1079 }
1080
1081 return present;
1082}
1083
1084static void b5k_instruction_hazard(void)
1085{
1086 __sync();
1087 __sync();
1088 __asm__ __volatile__(
1089 " nop; nop; nop; nop; nop; nop; nop; nop\n"
1090 " nop; nop; nop; nop; nop; nop; nop; nop\n"
1091 " nop; nop; nop; nop; nop; nop; nop; nop\n"
1092 " nop; nop; nop; nop; nop; nop; nop; nop\n"
1093 : : : "memory");
1094}
1095
1096static char *way_string[] = { NULL, "direct mapped", "2-way",
1097 "3-way", "4-way", "5-way", "6-way", "7-way", "8-way",
1098 "9-way", "10-way", "11-way", "12-way",
1099 "13-way", "14-way", "15-way", "16-way",
1100};
1101
1102static void probe_pcache(void)
1103{
1104 struct cpuinfo_mips *c = ¤t_cpu_data;
1105 unsigned int config = read_c0_config();
1106 unsigned int prid = read_c0_prid();
1107 int has_74k_erratum = 0;
1108 unsigned long config1;
1109 unsigned int lsize;
1110
1111 switch (current_cpu_type()) {
1112 case CPU_R4600: /* QED style two way caches? */
1113 case CPU_R4700:
1114 case CPU_R5000:
1115 case CPU_NEVADA:
1116 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
1117 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1118 c->icache.ways = 2;
1119 c->icache.waybit = __ffs(icache_size/2);
1120
1121 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
1122 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1123 c->dcache.ways = 2;
1124 c->dcache.waybit= __ffs(dcache_size/2);
1125
1126 c->options |= MIPS_CPU_CACHE_CDEX_P;
1127 break;
1128
1129 case CPU_R5500:
1130 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
1131 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1132 c->icache.ways = 2;
1133 c->icache.waybit= 0;
1134
1135 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
1136 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1137 c->dcache.ways = 2;
1138 c->dcache.waybit = 0;
1139
1140 c->options |= MIPS_CPU_CACHE_CDEX_P | MIPS_CPU_PREFETCH;
1141 break;
1142
1143 case CPU_TX49XX:
1144 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
1145 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1146 c->icache.ways = 4;
1147 c->icache.waybit= 0;
1148
1149 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
1150 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1151 c->dcache.ways = 4;
1152 c->dcache.waybit = 0;
1153
1154 c->options |= MIPS_CPU_CACHE_CDEX_P;
1155 c->options |= MIPS_CPU_PREFETCH;
1156 break;
1157
1158 case CPU_R4000PC:
1159 case CPU_R4000SC:
1160 case CPU_R4000MC:
1161 case CPU_R4400PC:
1162 case CPU_R4400SC:
1163 case CPU_R4400MC:
1164 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
1165 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1166 c->icache.ways = 1;
1167 c->icache.waybit = 0; /* doesn't matter */
1168
1169 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
1170 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1171 c->dcache.ways = 1;
1172 c->dcache.waybit = 0; /* does not matter */
1173
1174 c->options |= MIPS_CPU_CACHE_CDEX_P;
1175 break;
1176
1177 case CPU_R10000:
1178 case CPU_R12000:
1179 case CPU_R14000:
1180 case CPU_R16000:
1181 icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29));
1182 c->icache.linesz = 64;
1183 c->icache.ways = 2;
1184 c->icache.waybit = 0;
1185
1186 dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26));
1187 c->dcache.linesz = 32;
1188 c->dcache.ways = 2;
1189 c->dcache.waybit = 0;
1190
1191 c->options |= MIPS_CPU_PREFETCH;
1192 break;
1193
1194 case CPU_VR4133:
1195 write_c0_config(config & ~VR41_CONF_P4K);
1196 fallthrough;
1197 case CPU_VR4131:
1198 /* Workaround for cache instruction bug of VR4131 */
1199 if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U ||
1200 c->processor_id == 0x0c82U) {
1201 config |= 0x00400000U;
1202 if (c->processor_id == 0x0c80U)
1203 config |= VR41_CONF_BP;
1204 write_c0_config(config);
1205 } else
1206 c->options |= MIPS_CPU_CACHE_CDEX_P;
1207
1208 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
1209 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1210 c->icache.ways = 2;
1211 c->icache.waybit = __ffs(icache_size/2);
1212
1213 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
1214 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1215 c->dcache.ways = 2;
1216 c->dcache.waybit = __ffs(dcache_size/2);
1217 break;
1218
1219 case CPU_VR41XX:
1220 case CPU_VR4111:
1221 case CPU_VR4121:
1222 case CPU_VR4122:
1223 case CPU_VR4181:
1224 case CPU_VR4181A:
1225 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
1226 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1227 c->icache.ways = 1;
1228 c->icache.waybit = 0; /* doesn't matter */
1229
1230 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
1231 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1232 c->dcache.ways = 1;
1233 c->dcache.waybit = 0; /* does not matter */
1234
1235 c->options |= MIPS_CPU_CACHE_CDEX_P;
1236 break;
1237
1238 case CPU_RM7000:
1239 rm7k_erratum31();
1240
1241 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
1242 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1243 c->icache.ways = 4;
1244 c->icache.waybit = __ffs(icache_size / c->icache.ways);
1245
1246 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
1247 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1248 c->dcache.ways = 4;
1249 c->dcache.waybit = __ffs(dcache_size / c->dcache.ways);
1250
1251 c->options |= MIPS_CPU_CACHE_CDEX_P;
1252 c->options |= MIPS_CPU_PREFETCH;
1253 break;
1254
1255 case CPU_LOONGSON2EF:
1256 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
1257 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
1258 if (prid & 0x3)
1259 c->icache.ways = 4;
1260 else
1261 c->icache.ways = 2;
1262 c->icache.waybit = 0;
1263
1264 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
1265 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
1266 if (prid & 0x3)
1267 c->dcache.ways = 4;
1268 else
1269 c->dcache.ways = 2;
1270 c->dcache.waybit = 0;
1271 break;
1272
1273 case CPU_LOONGSON64:
1274 config1 = read_c0_config1();
1275 lsize = (config1 >> 19) & 7;
1276 if (lsize)
1277 c->icache.linesz = 2 << lsize;
1278 else
1279 c->icache.linesz = 0;
1280 c->icache.sets = 64 << ((config1 >> 22) & 7);
1281 c->icache.ways = 1 + ((config1 >> 16) & 7);
1282 icache_size = c->icache.sets *
1283 c->icache.ways *
1284 c->icache.linesz;
1285 c->icache.waybit = 0;
1286
1287 lsize = (config1 >> 10) & 7;
1288 if (lsize)
1289 c->dcache.linesz = 2 << lsize;
1290 else
1291 c->dcache.linesz = 0;
1292 c->dcache.sets = 64 << ((config1 >> 13) & 7);
1293 c->dcache.ways = 1 + ((config1 >> 7) & 7);
1294 dcache_size = c->dcache.sets *
1295 c->dcache.ways *
1296 c->dcache.linesz;
1297 c->dcache.waybit = 0;
1298 if ((c->processor_id & (PRID_IMP_MASK | PRID_REV_MASK)) >=
1299 (PRID_IMP_LOONGSON_64C | PRID_REV_LOONGSON3A_R2_0) ||
1300 (c->processor_id & PRID_IMP_MASK) == PRID_IMP_LOONGSON_64R)
1301 c->options |= MIPS_CPU_PREFETCH;
1302 break;
1303
1304 case CPU_CAVIUM_OCTEON3:
1305 /* For now lie about the number of ways. */
1306 c->icache.linesz = 128;
1307 c->icache.sets = 16;
1308 c->icache.ways = 8;
1309 c->icache.flags |= MIPS_CACHE_VTAG;
1310 icache_size = c->icache.sets * c->icache.ways * c->icache.linesz;
1311
1312 c->dcache.linesz = 128;
1313 c->dcache.ways = 8;
1314 c->dcache.sets = 8;
1315 dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz;
1316 c->options |= MIPS_CPU_PREFETCH;
1317 break;
1318
1319 default:
1320 if (!(config & MIPS_CONF_M))
1321 panic("Don't know how to probe P-caches on this cpu.");
1322
1323 /*
1324 * So we seem to be a MIPS32 or MIPS64 CPU
1325 * So let's probe the I-cache ...
1326 */
1327 config1 = read_c0_config1();
1328
1329 lsize = (config1 >> 19) & 7;
1330
1331 /* IL == 7 is reserved */
1332 if (lsize == 7)
1333 panic("Invalid icache line size");
1334
1335 c->icache.linesz = lsize ? 2 << lsize : 0;
1336
1337 c->icache.sets = 32 << (((config1 >> 22) + 1) & 7);
1338 c->icache.ways = 1 + ((config1 >> 16) & 7);
1339
1340 icache_size = c->icache.sets *
1341 c->icache.ways *
1342 c->icache.linesz;
1343 c->icache.waybit = __ffs(icache_size/c->icache.ways);
1344
1345 if (config & MIPS_CONF_VI)
1346 c->icache.flags |= MIPS_CACHE_VTAG;
1347
1348 /*
1349 * Now probe the MIPS32 / MIPS64 data cache.
1350 */
1351 c->dcache.flags = 0;
1352
1353 lsize = (config1 >> 10) & 7;
1354
1355 /* DL == 7 is reserved */
1356 if (lsize == 7)
1357 panic("Invalid dcache line size");
1358
1359 c->dcache.linesz = lsize ? 2 << lsize : 0;
1360
1361 c->dcache.sets = 32 << (((config1 >> 13) + 1) & 7);
1362 c->dcache.ways = 1 + ((config1 >> 7) & 7);
1363
1364 dcache_size = c->dcache.sets *
1365 c->dcache.ways *
1366 c->dcache.linesz;
1367 c->dcache.waybit = __ffs(dcache_size/c->dcache.ways);
1368
1369 c->options |= MIPS_CPU_PREFETCH;
1370 break;
1371 }
1372
1373 /*
1374 * Processor configuration sanity check for the R4000SC erratum
1375 * #5. With page sizes larger than 32kB there is no possibility
1376 * to get a VCE exception anymore so we don't care about this
1377 * misconfiguration. The case is rather theoretical anyway;
1378 * presumably no vendor is shipping his hardware in the "bad"
1379 * configuration.
1380 */
1381 if ((prid & PRID_IMP_MASK) == PRID_IMP_R4000 &&
1382 (prid & PRID_REV_MASK) < PRID_REV_R4400 &&
1383 !(config & CONF_SC) && c->icache.linesz != 16 &&
1384 PAGE_SIZE <= 0x8000)
1385 panic("Improper R4000SC processor configuration detected");
1386
1387 /* compute a couple of other cache variables */
1388 c->icache.waysize = icache_size / c->icache.ways;
1389 c->dcache.waysize = dcache_size / c->dcache.ways;
1390
1391 c->icache.sets = c->icache.linesz ?
1392 icache_size / (c->icache.linesz * c->icache.ways) : 0;
1393 c->dcache.sets = c->dcache.linesz ?
1394 dcache_size / (c->dcache.linesz * c->dcache.ways) : 0;
1395
1396 /*
1397 * R1x000 P-caches are odd in a positive way. They're 32kB 2-way
1398 * virtually indexed so normally would suffer from aliases. So
1399 * normally they'd suffer from aliases but magic in the hardware deals
1400 * with that for us so we don't need to take care ourselves.
1401 */
1402 switch (current_cpu_type()) {
1403 case CPU_20KC:
1404 case CPU_25KF:
1405 case CPU_I6400:
1406 case CPU_I6500:
1407 case CPU_SB1:
1408 case CPU_SB1A:
1409 case CPU_XLR:
1410 c->dcache.flags |= MIPS_CACHE_PINDEX;
1411 break;
1412
1413 case CPU_R10000:
1414 case CPU_R12000:
1415 case CPU_R14000:
1416 case CPU_R16000:
1417 break;
1418
1419 case CPU_74K:
1420 case CPU_1074K:
1421 has_74k_erratum = alias_74k_erratum(c);
1422 fallthrough;
1423 case CPU_M14KC:
1424 case CPU_M14KEC:
1425 case CPU_24K:
1426 case CPU_34K:
1427 case CPU_1004K:
1428 case CPU_INTERAPTIV:
1429 case CPU_P5600:
1430 case CPU_PROAPTIV:
1431 case CPU_M5150:
1432 case CPU_QEMU_GENERIC:
1433 case CPU_P6600:
1434 case CPU_M6250:
1435 if (!(read_c0_config7() & MIPS_CONF7_IAR) &&
1436 (c->icache.waysize > PAGE_SIZE))
1437 c->icache.flags |= MIPS_CACHE_ALIASES;
1438 if (!has_74k_erratum && (read_c0_config7() & MIPS_CONF7_AR)) {
1439 /*
1440 * Effectively physically indexed dcache,
1441 * thus no virtual aliases.
1442 */
1443 c->dcache.flags |= MIPS_CACHE_PINDEX;
1444 break;
1445 }
1446 fallthrough;
1447 default:
1448 if (has_74k_erratum || c->dcache.waysize > PAGE_SIZE)
1449 c->dcache.flags |= MIPS_CACHE_ALIASES;
1450 }
1451
1452 /* Physically indexed caches don't suffer from virtual aliasing */
1453 if (c->dcache.flags & MIPS_CACHE_PINDEX)
1454 c->dcache.flags &= ~MIPS_CACHE_ALIASES;
1455
1456 /*
1457 * In systems with CM the icache fills from L2 or closer caches, and
1458 * thus sees remote stores without needing to write them back any
1459 * further than that.
1460 */
1461 if (mips_cm_present())
1462 c->icache.flags |= MIPS_IC_SNOOPS_REMOTE;
1463
1464 switch (current_cpu_type()) {
1465 case CPU_20KC:
1466 /*
1467 * Some older 20Kc chips doesn't have the 'VI' bit in
1468 * the config register.
1469 */
1470 c->icache.flags |= MIPS_CACHE_VTAG;
1471 break;
1472
1473 case CPU_ALCHEMY:
1474 case CPU_I6400:
1475 case CPU_I6500:
1476 c->icache.flags |= MIPS_CACHE_IC_F_DC;
1477 break;
1478
1479 case CPU_BMIPS5000:
1480 c->icache.flags |= MIPS_CACHE_IC_F_DC;
1481 /* Cache aliases are handled in hardware; allow HIGHMEM */
1482 c->dcache.flags &= ~MIPS_CACHE_ALIASES;
1483 break;
1484
1485 case CPU_LOONGSON2EF:
1486 /*
1487 * LOONGSON2 has 4 way icache, but when using indexed cache op,
1488 * one op will act on all 4 ways
1489 */
1490 c->icache.ways = 1;
1491 }
1492
1493 pr_info("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
1494 icache_size >> 10,
1495 c->icache.flags & MIPS_CACHE_VTAG ? "VIVT" : "VIPT",
1496 way_string[c->icache.ways], c->icache.linesz);
1497
1498 pr_info("Primary data cache %ldkB, %s, %s, %s, linesize %d bytes\n",
1499 dcache_size >> 10, way_string[c->dcache.ways],
1500 (c->dcache.flags & MIPS_CACHE_PINDEX) ? "PIPT" : "VIPT",
1501 (c->dcache.flags & MIPS_CACHE_ALIASES) ?
1502 "cache aliases" : "no aliases",
1503 c->dcache.linesz);
1504}
1505
1506static void probe_vcache(void)
1507{
1508 struct cpuinfo_mips *c = ¤t_cpu_data;
1509 unsigned int config2, lsize;
1510
1511 if (current_cpu_type() != CPU_LOONGSON64)
1512 return;
1513
1514 config2 = read_c0_config2();
1515 if ((lsize = ((config2 >> 20) & 15)))
1516 c->vcache.linesz = 2 << lsize;
1517 else
1518 c->vcache.linesz = lsize;
1519
1520 c->vcache.sets = 64 << ((config2 >> 24) & 15);
1521 c->vcache.ways = 1 + ((config2 >> 16) & 15);
1522
1523 vcache_size = c->vcache.sets * c->vcache.ways * c->vcache.linesz;
1524
1525 c->vcache.waybit = 0;
1526 c->vcache.waysize = vcache_size / c->vcache.ways;
1527
1528 pr_info("Unified victim cache %ldkB %s, linesize %d bytes.\n",
1529 vcache_size >> 10, way_string[c->vcache.ways], c->vcache.linesz);
1530}
1531
1532/*
1533 * If you even _breathe_ on this function, look at the gcc output and make sure
1534 * it does not pop things on and off the stack for the cache sizing loop that
1535 * executes in KSEG1 space or else you will crash and burn badly. You have
1536 * been warned.
1537 */
1538static int probe_scache(void)
1539{
1540 unsigned long flags, addr, begin, end, pow2;
1541 unsigned int config = read_c0_config();
1542 struct cpuinfo_mips *c = ¤t_cpu_data;
1543
1544 if (config & CONF_SC)
1545 return 0;
1546
1547 begin = (unsigned long) &_stext;
1548 begin &= ~((4 * 1024 * 1024) - 1);
1549 end = begin + (4 * 1024 * 1024);
1550
1551 /*
1552 * This is such a bitch, you'd think they would make it easy to do
1553 * this. Away you daemons of stupidity!
1554 */
1555 local_irq_save(flags);
1556
1557 /* Fill each size-multiple cache line with a valid tag. */
1558 pow2 = (64 * 1024);
1559 for (addr = begin; addr < end; addr = (begin + pow2)) {
1560 unsigned long *p = (unsigned long *) addr;
1561 __asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
1562 pow2 <<= 1;
1563 }
1564
1565 /* Load first line with zero (therefore invalid) tag. */
1566 write_c0_taglo(0);
1567 write_c0_taghi(0);
1568 __asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
1569 cache_op(Index_Store_Tag_I, begin);
1570 cache_op(Index_Store_Tag_D, begin);
1571 cache_op(Index_Store_Tag_SD, begin);
1572
1573 /* Now search for the wrap around point. */
1574 pow2 = (128 * 1024);
1575 for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) {
1576 cache_op(Index_Load_Tag_SD, addr);
1577 __asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
1578 if (!read_c0_taglo())
1579 break;
1580 pow2 <<= 1;
1581 }
1582 local_irq_restore(flags);
1583 addr -= begin;
1584
1585 scache_size = addr;
1586 c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22);
1587 c->scache.ways = 1;
1588 c->scache.waybit = 0; /* does not matter */
1589
1590 return 1;
1591}
1592
1593static void __init loongson2_sc_init(void)
1594{
1595 struct cpuinfo_mips *c = ¤t_cpu_data;
1596
1597 scache_size = 512*1024;
1598 c->scache.linesz = 32;
1599 c->scache.ways = 4;
1600 c->scache.waybit = 0;
1601 c->scache.waysize = scache_size / (c->scache.ways);
1602 c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1603 pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1604 scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1605
1606 c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1607}
1608
1609static void __init loongson3_sc_init(void)
1610{
1611 struct cpuinfo_mips *c = ¤t_cpu_data;
1612 unsigned int config2, lsize;
1613
1614 config2 = read_c0_config2();
1615 lsize = (config2 >> 4) & 15;
1616 if (lsize)
1617 c->scache.linesz = 2 << lsize;
1618 else
1619 c->scache.linesz = 0;
1620 c->scache.sets = 64 << ((config2 >> 8) & 15);
1621 c->scache.ways = 1 + (config2 & 15);
1622
1623 scache_size = c->scache.sets *
1624 c->scache.ways *
1625 c->scache.linesz;
1626
1627 /* Loongson-3 has 4-Scache banks, while Loongson-2K have only 2 banks */
1628 if ((c->processor_id & PRID_IMP_MASK) == PRID_IMP_LOONGSON_64R)
1629 scache_size *= 2;
1630 else
1631 scache_size *= 4;
1632
1633 c->scache.waybit = 0;
1634 c->scache.waysize = scache_size / c->scache.ways;
1635 pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1636 scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1637 if (scache_size)
1638 c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1639 return;
1640}
1641
1642extern int r5k_sc_init(void);
1643extern int rm7k_sc_init(void);
1644extern int mips_sc_init(void);
1645
1646static void setup_scache(void)
1647{
1648 struct cpuinfo_mips *c = ¤t_cpu_data;
1649 unsigned int config = read_c0_config();
1650 int sc_present = 0;
1651
1652 /*
1653 * Do the probing thing on R4000SC and R4400SC processors. Other
1654 * processors don't have a S-cache that would be relevant to the
1655 * Linux memory management.
1656 */
1657 switch (current_cpu_type()) {
1658 case CPU_R4000SC:
1659 case CPU_R4000MC:
1660 case CPU_R4400SC:
1661 case CPU_R4400MC:
1662 sc_present = run_uncached(probe_scache);
1663 if (sc_present)
1664 c->options |= MIPS_CPU_CACHE_CDEX_S;
1665 break;
1666
1667 case CPU_R10000:
1668 case CPU_R12000:
1669 case CPU_R14000:
1670 case CPU_R16000:
1671 scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16);
1672 c->scache.linesz = 64 << ((config >> 13) & 1);
1673 c->scache.ways = 2;
1674 c->scache.waybit= 0;
1675 sc_present = 1;
1676 break;
1677
1678 case CPU_R5000:
1679 case CPU_NEVADA:
1680#ifdef CONFIG_R5000_CPU_SCACHE
1681 r5k_sc_init();
1682#endif
1683 return;
1684
1685 case CPU_RM7000:
1686#ifdef CONFIG_RM7000_CPU_SCACHE
1687 rm7k_sc_init();
1688#endif
1689 return;
1690
1691 case CPU_LOONGSON2EF:
1692 loongson2_sc_init();
1693 return;
1694
1695 case CPU_LOONGSON64:
1696 loongson3_sc_init();
1697 return;
1698
1699 case CPU_CAVIUM_OCTEON3:
1700 case CPU_XLP:
1701 /* don't need to worry about L2, fully coherent */
1702 return;
1703
1704 default:
1705 if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1 |
1706 MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2 |
1707 MIPS_CPU_ISA_M32R5 | MIPS_CPU_ISA_M64R5 |
1708 MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6)) {
1709#ifdef CONFIG_MIPS_CPU_SCACHE
1710 if (mips_sc_init ()) {
1711 scache_size = c->scache.ways * c->scache.sets * c->scache.linesz;
1712 printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n",
1713 scache_size >> 10,
1714 way_string[c->scache.ways], c->scache.linesz);
1715
1716 if (current_cpu_type() == CPU_BMIPS5000)
1717 c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1718 }
1719
1720#else
1721 if (!(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
1722 panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
1723#endif
1724 return;
1725 }
1726 sc_present = 0;
1727 }
1728
1729 if (!sc_present)
1730 return;
1731
1732 /* compute a couple of other cache variables */
1733 c->scache.waysize = scache_size / c->scache.ways;
1734
1735 c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1736
1737 printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1738 scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1739
1740 c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1741}
1742
1743void au1x00_fixup_config_od(void)
1744{
1745 /*
1746 * c0_config.od (bit 19) was write only (and read as 0)
1747 * on the early revisions of Alchemy SOCs. It disables the bus
1748 * transaction overlapping and needs to be set to fix various errata.
1749 */
1750 switch (read_c0_prid()) {
1751 case 0x00030100: /* Au1000 DA */
1752 case 0x00030201: /* Au1000 HA */
1753 case 0x00030202: /* Au1000 HB */
1754 case 0x01030200: /* Au1500 AB */
1755 /*
1756 * Au1100 errata actually keeps silence about this bit, so we set it
1757 * just in case for those revisions that require it to be set according
1758 * to the (now gone) cpu table.
1759 */
1760 case 0x02030200: /* Au1100 AB */
1761 case 0x02030201: /* Au1100 BA */
1762 case 0x02030202: /* Au1100 BC */
1763 set_c0_config(1 << 19);
1764 break;
1765 }
1766}
1767
1768/* CP0 hazard avoidance. */
1769#define NXP_BARRIER() \
1770 __asm__ __volatile__( \
1771 ".set noreorder\n\t" \
1772 "nop; nop; nop; nop; nop; nop;\n\t" \
1773 ".set reorder\n\t")
1774
1775static void nxp_pr4450_fixup_config(void)
1776{
1777 unsigned long config0;
1778
1779 config0 = read_c0_config();
1780
1781 /* clear all three cache coherency fields */
1782 config0 &= ~(0x7 | (7 << 25) | (7 << 28));
1783 config0 |= (((_page_cachable_default >> _CACHE_SHIFT) << 0) |
1784 ((_page_cachable_default >> _CACHE_SHIFT) << 25) |
1785 ((_page_cachable_default >> _CACHE_SHIFT) << 28));
1786 write_c0_config(config0);
1787 NXP_BARRIER();
1788}
1789
1790static int cca = -1;
1791
1792static int __init cca_setup(char *str)
1793{
1794 get_option(&str, &cca);
1795
1796 return 0;
1797}
1798
1799early_param("cca", cca_setup);
1800
1801static void coherency_setup(void)
1802{
1803 if (cca < 0 || cca > 7)
1804 cca = read_c0_config() & CONF_CM_CMASK;
1805 _page_cachable_default = cca << _CACHE_SHIFT;
1806
1807 pr_debug("Using cache attribute %d\n", cca);
1808 change_c0_config(CONF_CM_CMASK, cca);
1809
1810 /*
1811 * c0_status.cu=0 specifies that updates by the sc instruction use
1812 * the coherency mode specified by the TLB; 1 means cachable
1813 * coherent update on write will be used. Not all processors have
1814 * this bit and; some wire it to zero, others like Toshiba had the
1815 * silly idea of putting something else there ...
1816 */
1817 switch (current_cpu_type()) {
1818 case CPU_R4000PC:
1819 case CPU_R4000SC:
1820 case CPU_R4000MC:
1821 case CPU_R4400PC:
1822 case CPU_R4400SC:
1823 case CPU_R4400MC:
1824 clear_c0_config(CONF_CU);
1825 break;
1826 /*
1827 * We need to catch the early Alchemy SOCs with
1828 * the write-only co_config.od bit and set it back to one on:
1829 * Au1000 rev DA, HA, HB; Au1100 AB, BA, BC, Au1500 AB
1830 */
1831 case CPU_ALCHEMY:
1832 au1x00_fixup_config_od();
1833 break;
1834
1835 case PRID_IMP_PR4450:
1836 nxp_pr4450_fixup_config();
1837 break;
1838 }
1839}
1840
1841static void r4k_cache_error_setup(void)
1842{
1843 extern char __weak except_vec2_generic;
1844 extern char __weak except_vec2_sb1;
1845
1846 switch (current_cpu_type()) {
1847 case CPU_SB1:
1848 case CPU_SB1A:
1849 set_uncached_handler(0x100, &except_vec2_sb1, 0x80);
1850 break;
1851
1852 default:
1853 set_uncached_handler(0x100, &except_vec2_generic, 0x80);
1854 break;
1855 }
1856}
1857
1858void r4k_cache_init(void)
1859{
1860 extern void build_clear_page(void);
1861 extern void build_copy_page(void);
1862 struct cpuinfo_mips *c = ¤t_cpu_data;
1863
1864 probe_pcache();
1865 probe_vcache();
1866 setup_scache();
1867
1868 r4k_blast_dcache_page_setup();
1869 r4k_blast_dcache_page_indexed_setup();
1870 r4k_blast_dcache_setup();
1871 r4k_blast_icache_page_setup();
1872 r4k_blast_icache_page_indexed_setup();
1873 r4k_blast_icache_setup();
1874 r4k_blast_scache_page_setup();
1875 r4k_blast_scache_page_indexed_setup();
1876 r4k_blast_scache_setup();
1877 r4k_blast_scache_node_setup();
1878#ifdef CONFIG_EVA
1879 r4k_blast_dcache_user_page_setup();
1880 r4k_blast_icache_user_page_setup();
1881#endif
1882
1883 /*
1884 * Some MIPS32 and MIPS64 processors have physically indexed caches.
1885 * This code supports virtually indexed processors and will be
1886 * unnecessarily inefficient on physically indexed processors.
1887 */
1888 if (c->dcache.linesz && cpu_has_dc_aliases)
1889 shm_align_mask = max_t( unsigned long,
1890 c->dcache.sets * c->dcache.linesz - 1,
1891 PAGE_SIZE - 1);
1892 else
1893 shm_align_mask = PAGE_SIZE-1;
1894
1895 __flush_cache_vmap = r4k__flush_cache_vmap;
1896 __flush_cache_vunmap = r4k__flush_cache_vunmap;
1897
1898 flush_cache_all = cache_noop;
1899 __flush_cache_all = r4k___flush_cache_all;
1900 flush_cache_mm = r4k_flush_cache_mm;
1901 flush_cache_page = r4k_flush_cache_page;
1902 flush_cache_range = r4k_flush_cache_range;
1903
1904 __flush_kernel_vmap_range = r4k_flush_kernel_vmap_range;
1905
1906 flush_icache_all = r4k_flush_icache_all;
1907 local_flush_data_cache_page = local_r4k_flush_data_cache_page;
1908 flush_data_cache_page = r4k_flush_data_cache_page;
1909 flush_icache_range = r4k_flush_icache_range;
1910 local_flush_icache_range = local_r4k_flush_icache_range;
1911 __flush_icache_user_range = r4k_flush_icache_user_range;
1912 __local_flush_icache_user_range = local_r4k_flush_icache_user_range;
1913
1914#ifdef CONFIG_DMA_NONCOHERENT
1915#ifdef CONFIG_DMA_MAYBE_COHERENT
1916 if (coherentio == IO_COHERENCE_ENABLED ||
1917 (coherentio == IO_COHERENCE_DEFAULT && hw_coherentio)) {
1918 _dma_cache_wback_inv = (void *)cache_noop;
1919 _dma_cache_wback = (void *)cache_noop;
1920 _dma_cache_inv = (void *)cache_noop;
1921 } else
1922#endif /* CONFIG_DMA_MAYBE_COHERENT */
1923 {
1924 _dma_cache_wback_inv = r4k_dma_cache_wback_inv;
1925 _dma_cache_wback = r4k_dma_cache_wback_inv;
1926 _dma_cache_inv = r4k_dma_cache_inv;
1927 }
1928#endif /* CONFIG_DMA_NONCOHERENT */
1929
1930 build_clear_page();
1931 build_copy_page();
1932
1933 /*
1934 * We want to run CMP kernels on core with and without coherent
1935 * caches. Therefore, do not use CONFIG_MIPS_CMP to decide whether
1936 * or not to flush caches.
1937 */
1938 local_r4k___flush_cache_all(NULL);
1939
1940 coherency_setup();
1941 board_cache_error_setup = r4k_cache_error_setup;
1942
1943 /*
1944 * Per-CPU overrides
1945 */
1946 switch (current_cpu_type()) {
1947 case CPU_BMIPS4350:
1948 case CPU_BMIPS4380:
1949 /* No IPI is needed because all CPUs share the same D$ */
1950 flush_data_cache_page = r4k_blast_dcache_page;
1951 break;
1952 case CPU_BMIPS5000:
1953 /* We lose our superpowers if L2 is disabled */
1954 if (c->scache.flags & MIPS_CACHE_NOT_PRESENT)
1955 break;
1956
1957 /* I$ fills from D$ just by emptying the write buffers */
1958 flush_cache_page = (void *)b5k_instruction_hazard;
1959 flush_cache_range = (void *)b5k_instruction_hazard;
1960 local_flush_data_cache_page = (void *)b5k_instruction_hazard;
1961 flush_data_cache_page = (void *)b5k_instruction_hazard;
1962 flush_icache_range = (void *)b5k_instruction_hazard;
1963 local_flush_icache_range = (void *)b5k_instruction_hazard;
1964
1965
1966 /* Optimization: an L2 flush implicitly flushes the L1 */
1967 current_cpu_data.options |= MIPS_CPU_INCLUSIVE_CACHES;
1968 break;
1969 case CPU_LOONGSON64:
1970 /* Loongson-3 maintains cache coherency by hardware */
1971 __flush_cache_all = cache_noop;
1972 __flush_cache_vmap = cache_noop;
1973 __flush_cache_vunmap = cache_noop;
1974 __flush_kernel_vmap_range = (void *)cache_noop;
1975 flush_cache_mm = (void *)cache_noop;
1976 flush_cache_page = (void *)cache_noop;
1977 flush_cache_range = (void *)cache_noop;
1978 flush_icache_all = (void *)cache_noop;
1979 flush_data_cache_page = (void *)cache_noop;
1980 local_flush_data_cache_page = (void *)cache_noop;
1981 break;
1982 }
1983}
1984
1985static int r4k_cache_pm_notifier(struct notifier_block *self, unsigned long cmd,
1986 void *v)
1987{
1988 switch (cmd) {
1989 case CPU_PM_ENTER_FAILED:
1990 case CPU_PM_EXIT:
1991 coherency_setup();
1992 break;
1993 }
1994
1995 return NOTIFY_OK;
1996}
1997
1998static struct notifier_block r4k_cache_pm_notifier_block = {
1999 .notifier_call = r4k_cache_pm_notifier,
2000};
2001
2002int __init r4k_cache_init_pm(void)
2003{
2004 return cpu_pm_register_notifier(&r4k_cache_pm_notifier_block);
2005}
2006arch_initcall(r4k_cache_init_pm);