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
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.
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>
20 #include <linux/module.h>
21 #include <linux/bitops.h>
23 #include <asm/bcache.h>
24 #include <asm/bootinfo.h>
25 #include <asm/cache.h>
26 #include <asm/cacheops.h>
28 #include <asm/cpu-features.h>
29 #include <asm/cpu-type.h>
32 #include <asm/pgtable.h>
33 #include <asm/r4kcache.h>
34 #include <asm/sections.h>
35 #include <asm/mmu_context.h>
37 #include <asm/cacheflush.h> /* for run_uncached() */
38 #include <asm/traps.h>
39 #include <asm/dma-coherence.h>
40 #include <asm/mips-cm.h>
43 * Special Variant of smp_call_function for use by cache functions:
46 * o collapses to normal function call on UP kernels
47 * o collapses to normal function call on systems with a single shared
49 * o doesn't disable interrupts on the local CPU
51 static inline void r4k_on_each_cpu(void (*func
) (void *info
), void *info
)
56 * The Coherent Manager propagates address-based cache ops to other
57 * cores but not index-based ops. However, r4k_on_each_cpu is used
58 * in both cases so there is no easy way to tell what kind of op is
59 * executed to the other cores. The best we can probably do is
60 * to restrict that call when a CM is not present because both
61 * CM-based SMP protocols (CMP & CPS) restrict index-based cache ops.
63 if (!mips_cm_present())
64 smp_call_function_many(&cpu_foreign_map
, func
, info
, 1);
72 static unsigned long icache_size __read_mostly
;
73 static unsigned long dcache_size __read_mostly
;
74 static unsigned long vcache_size __read_mostly
;
75 static unsigned long scache_size __read_mostly
;
78 * Dummy cache handling routines for machines without boardcaches
80 static void cache_noop(void) {}
82 static struct bcache_ops no_sc_ops
= {
83 .bc_enable
= (void *)cache_noop
,
84 .bc_disable
= (void *)cache_noop
,
85 .bc_wback_inv
= (void *)cache_noop
,
86 .bc_inv
= (void *)cache_noop
89 struct bcache_ops
*bcops
= &no_sc_ops
;
91 #define cpu_is_r4600_v1_x() ((read_c0_prid() & 0xfffffff0) == 0x00002010)
92 #define cpu_is_r4600_v2_x() ((read_c0_prid() & 0xfffffff0) == 0x00002020)
94 #define R4600_HIT_CACHEOP_WAR_IMPL \
96 if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x()) \
97 *(volatile unsigned long *)CKSEG1; \
98 if (R4600_V1_HIT_CACHEOP_WAR) \
99 __asm__ __volatile__("nop;nop;nop;nop"); \
102 static void (*r4k_blast_dcache_page
)(unsigned long addr
);
104 static inline void r4k_blast_dcache_page_dc32(unsigned long addr
)
106 R4600_HIT_CACHEOP_WAR_IMPL
;
107 blast_dcache32_page(addr
);
110 static inline void r4k_blast_dcache_page_dc64(unsigned long addr
)
112 blast_dcache64_page(addr
);
115 static inline void r4k_blast_dcache_page_dc128(unsigned long addr
)
117 blast_dcache128_page(addr
);
120 static void r4k_blast_dcache_page_setup(void)
122 unsigned long dc_lsize
= cpu_dcache_line_size();
126 r4k_blast_dcache_page
= (void *)cache_noop
;
129 r4k_blast_dcache_page
= blast_dcache16_page
;
132 r4k_blast_dcache_page
= r4k_blast_dcache_page_dc32
;
135 r4k_blast_dcache_page
= r4k_blast_dcache_page_dc64
;
138 r4k_blast_dcache_page
= r4k_blast_dcache_page_dc128
;
146 #define r4k_blast_dcache_user_page r4k_blast_dcache_page
149 static void (*r4k_blast_dcache_user_page
)(unsigned long addr
);
151 static void r4k_blast_dcache_user_page_setup(void)
153 unsigned long dc_lsize
= cpu_dcache_line_size();
156 r4k_blast_dcache_user_page
= (void *)cache_noop
;
157 else if (dc_lsize
== 16)
158 r4k_blast_dcache_user_page
= blast_dcache16_user_page
;
159 else if (dc_lsize
== 32)
160 r4k_blast_dcache_user_page
= blast_dcache32_user_page
;
161 else if (dc_lsize
== 64)
162 r4k_blast_dcache_user_page
= blast_dcache64_user_page
;
167 static void (* r4k_blast_dcache_page_indexed
)(unsigned long addr
);
169 static void r4k_blast_dcache_page_indexed_setup(void)
171 unsigned long dc_lsize
= cpu_dcache_line_size();
174 r4k_blast_dcache_page_indexed
= (void *)cache_noop
;
175 else if (dc_lsize
== 16)
176 r4k_blast_dcache_page_indexed
= blast_dcache16_page_indexed
;
177 else if (dc_lsize
== 32)
178 r4k_blast_dcache_page_indexed
= blast_dcache32_page_indexed
;
179 else if (dc_lsize
== 64)
180 r4k_blast_dcache_page_indexed
= blast_dcache64_page_indexed
;
181 else if (dc_lsize
== 128)
182 r4k_blast_dcache_page_indexed
= blast_dcache128_page_indexed
;
185 void (* r4k_blast_dcache
)(void);
186 EXPORT_SYMBOL(r4k_blast_dcache
);
188 static void r4k_blast_dcache_setup(void)
190 unsigned long dc_lsize
= cpu_dcache_line_size();
193 r4k_blast_dcache
= (void *)cache_noop
;
194 else if (dc_lsize
== 16)
195 r4k_blast_dcache
= blast_dcache16
;
196 else if (dc_lsize
== 32)
197 r4k_blast_dcache
= blast_dcache32
;
198 else if (dc_lsize
== 64)
199 r4k_blast_dcache
= blast_dcache64
;
200 else if (dc_lsize
== 128)
201 r4k_blast_dcache
= blast_dcache128
;
204 /* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
205 #define JUMP_TO_ALIGN(order) \
206 __asm__ __volatile__( \
208 ".align\t" #order "\n\t" \
211 #define CACHE32_UNROLL32_ALIGN JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
212 #define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
214 static inline void blast_r4600_v1_icache32(void)
218 local_irq_save(flags
);
220 local_irq_restore(flags
);
223 static inline void tx49_blast_icache32(void)
225 unsigned long start
= INDEX_BASE
;
226 unsigned long end
= start
+ current_cpu_data
.icache
.waysize
;
227 unsigned long ws_inc
= 1UL << current_cpu_data
.icache
.waybit
;
228 unsigned long ws_end
= current_cpu_data
.icache
.ways
<<
229 current_cpu_data
.icache
.waybit
;
230 unsigned long ws
, addr
;
232 CACHE32_UNROLL32_ALIGN2
;
233 /* I'm in even chunk. blast odd chunks */
234 for (ws
= 0; ws
< ws_end
; ws
+= ws_inc
)
235 for (addr
= start
+ 0x400; addr
< end
; addr
+= 0x400 * 2)
236 cache32_unroll32(addr
|ws
, Index_Invalidate_I
);
237 CACHE32_UNROLL32_ALIGN
;
238 /* I'm in odd chunk. blast even chunks */
239 for (ws
= 0; ws
< ws_end
; ws
+= ws_inc
)
240 for (addr
= start
; addr
< end
; addr
+= 0x400 * 2)
241 cache32_unroll32(addr
|ws
, Index_Invalidate_I
);
244 static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page
)
248 local_irq_save(flags
);
249 blast_icache32_page_indexed(page
);
250 local_irq_restore(flags
);
253 static inline void tx49_blast_icache32_page_indexed(unsigned long page
)
255 unsigned long indexmask
= current_cpu_data
.icache
.waysize
- 1;
256 unsigned long start
= INDEX_BASE
+ (page
& indexmask
);
257 unsigned long end
= start
+ PAGE_SIZE
;
258 unsigned long ws_inc
= 1UL << current_cpu_data
.icache
.waybit
;
259 unsigned long ws_end
= current_cpu_data
.icache
.ways
<<
260 current_cpu_data
.icache
.waybit
;
261 unsigned long ws
, addr
;
263 CACHE32_UNROLL32_ALIGN2
;
264 /* I'm in even chunk. blast odd chunks */
265 for (ws
= 0; ws
< ws_end
; ws
+= ws_inc
)
266 for (addr
= start
+ 0x400; addr
< end
; addr
+= 0x400 * 2)
267 cache32_unroll32(addr
|ws
, Index_Invalidate_I
);
268 CACHE32_UNROLL32_ALIGN
;
269 /* I'm in odd chunk. blast even chunks */
270 for (ws
= 0; ws
< ws_end
; ws
+= ws_inc
)
271 for (addr
= start
; addr
< end
; addr
+= 0x400 * 2)
272 cache32_unroll32(addr
|ws
, Index_Invalidate_I
);
275 static void (* r4k_blast_icache_page
)(unsigned long addr
);
277 static void r4k_blast_icache_page_setup(void)
279 unsigned long ic_lsize
= cpu_icache_line_size();
282 r4k_blast_icache_page
= (void *)cache_noop
;
283 else if (ic_lsize
== 16)
284 r4k_blast_icache_page
= blast_icache16_page
;
285 else if (ic_lsize
== 32 && current_cpu_type() == CPU_LOONGSON2
)
286 r4k_blast_icache_page
= loongson2_blast_icache32_page
;
287 else if (ic_lsize
== 32)
288 r4k_blast_icache_page
= blast_icache32_page
;
289 else if (ic_lsize
== 64)
290 r4k_blast_icache_page
= blast_icache64_page
;
291 else if (ic_lsize
== 128)
292 r4k_blast_icache_page
= blast_icache128_page
;
296 #define r4k_blast_icache_user_page r4k_blast_icache_page
299 static void (*r4k_blast_icache_user_page
)(unsigned long addr
);
301 static void r4k_blast_icache_user_page_setup(void)
303 unsigned long ic_lsize
= cpu_icache_line_size();
306 r4k_blast_icache_user_page
= (void *)cache_noop
;
307 else if (ic_lsize
== 16)
308 r4k_blast_icache_user_page
= blast_icache16_user_page
;
309 else if (ic_lsize
== 32)
310 r4k_blast_icache_user_page
= blast_icache32_user_page
;
311 else if (ic_lsize
== 64)
312 r4k_blast_icache_user_page
= blast_icache64_user_page
;
317 static void (* r4k_blast_icache_page_indexed
)(unsigned long addr
);
319 static void r4k_blast_icache_page_indexed_setup(void)
321 unsigned long ic_lsize
= cpu_icache_line_size();
324 r4k_blast_icache_page_indexed
= (void *)cache_noop
;
325 else if (ic_lsize
== 16)
326 r4k_blast_icache_page_indexed
= blast_icache16_page_indexed
;
327 else if (ic_lsize
== 32) {
328 if (R4600_V1_INDEX_ICACHEOP_WAR
&& cpu_is_r4600_v1_x())
329 r4k_blast_icache_page_indexed
=
330 blast_icache32_r4600_v1_page_indexed
;
331 else if (TX49XX_ICACHE_INDEX_INV_WAR
)
332 r4k_blast_icache_page_indexed
=
333 tx49_blast_icache32_page_indexed
;
334 else if (current_cpu_type() == CPU_LOONGSON2
)
335 r4k_blast_icache_page_indexed
=
336 loongson2_blast_icache32_page_indexed
;
338 r4k_blast_icache_page_indexed
=
339 blast_icache32_page_indexed
;
340 } else if (ic_lsize
== 64)
341 r4k_blast_icache_page_indexed
= blast_icache64_page_indexed
;
344 void (* r4k_blast_icache
)(void);
345 EXPORT_SYMBOL(r4k_blast_icache
);
347 static void r4k_blast_icache_setup(void)
349 unsigned long ic_lsize
= cpu_icache_line_size();
352 r4k_blast_icache
= (void *)cache_noop
;
353 else if (ic_lsize
== 16)
354 r4k_blast_icache
= blast_icache16
;
355 else if (ic_lsize
== 32) {
356 if (R4600_V1_INDEX_ICACHEOP_WAR
&& cpu_is_r4600_v1_x())
357 r4k_blast_icache
= blast_r4600_v1_icache32
;
358 else if (TX49XX_ICACHE_INDEX_INV_WAR
)
359 r4k_blast_icache
= tx49_blast_icache32
;
360 else if (current_cpu_type() == CPU_LOONGSON2
)
361 r4k_blast_icache
= loongson2_blast_icache32
;
363 r4k_blast_icache
= blast_icache32
;
364 } else if (ic_lsize
== 64)
365 r4k_blast_icache
= blast_icache64
;
366 else if (ic_lsize
== 128)
367 r4k_blast_icache
= blast_icache128
;
370 static void (* r4k_blast_scache_page
)(unsigned long addr
);
372 static void r4k_blast_scache_page_setup(void)
374 unsigned long sc_lsize
= cpu_scache_line_size();
376 if (scache_size
== 0)
377 r4k_blast_scache_page
= (void *)cache_noop
;
378 else if (sc_lsize
== 16)
379 r4k_blast_scache_page
= blast_scache16_page
;
380 else if (sc_lsize
== 32)
381 r4k_blast_scache_page
= blast_scache32_page
;
382 else if (sc_lsize
== 64)
383 r4k_blast_scache_page
= blast_scache64_page
;
384 else if (sc_lsize
== 128)
385 r4k_blast_scache_page
= blast_scache128_page
;
388 static void (* r4k_blast_scache_page_indexed
)(unsigned long addr
);
390 static void r4k_blast_scache_page_indexed_setup(void)
392 unsigned long sc_lsize
= cpu_scache_line_size();
394 if (scache_size
== 0)
395 r4k_blast_scache_page_indexed
= (void *)cache_noop
;
396 else if (sc_lsize
== 16)
397 r4k_blast_scache_page_indexed
= blast_scache16_page_indexed
;
398 else if (sc_lsize
== 32)
399 r4k_blast_scache_page_indexed
= blast_scache32_page_indexed
;
400 else if (sc_lsize
== 64)
401 r4k_blast_scache_page_indexed
= blast_scache64_page_indexed
;
402 else if (sc_lsize
== 128)
403 r4k_blast_scache_page_indexed
= blast_scache128_page_indexed
;
406 static void (* r4k_blast_scache
)(void);
408 static void r4k_blast_scache_setup(void)
410 unsigned long sc_lsize
= cpu_scache_line_size();
412 if (scache_size
== 0)
413 r4k_blast_scache
= (void *)cache_noop
;
414 else if (sc_lsize
== 16)
415 r4k_blast_scache
= blast_scache16
;
416 else if (sc_lsize
== 32)
417 r4k_blast_scache
= blast_scache32
;
418 else if (sc_lsize
== 64)
419 r4k_blast_scache
= blast_scache64
;
420 else if (sc_lsize
== 128)
421 r4k_blast_scache
= blast_scache128
;
424 static inline void local_r4k___flush_cache_all(void * args
)
426 switch (current_cpu_type()) {
438 * These caches are inclusive caches, that is, if something
439 * is not cached in the S-cache, we know it also won't be
440 * in one of the primary caches.
457 static void r4k___flush_cache_all(void)
459 r4k_on_each_cpu(local_r4k___flush_cache_all
, NULL
);
462 static inline int has_valid_asid(const struct mm_struct
*mm
)
464 #ifdef CONFIG_MIPS_MT_SMP
467 for_each_online_cpu(i
)
468 if (cpu_context(i
, mm
))
473 return cpu_context(smp_processor_id(), mm
);
477 static void r4k__flush_cache_vmap(void)
482 static void r4k__flush_cache_vunmap(void)
487 static inline void local_r4k_flush_cache_range(void * args
)
489 struct vm_area_struct
*vma
= args
;
490 int exec
= vma
->vm_flags
& VM_EXEC
;
492 if (!(has_valid_asid(vma
->vm_mm
)))
496 * If dcache can alias, we must blast it since mapping is changing.
497 * If executable, we must ensure any dirty lines are written back far
498 * enough to be visible to icache.
500 if (cpu_has_dc_aliases
|| (exec
&& !cpu_has_ic_fills_f_dc
))
502 /* If executable, blast stale lines from icache */
507 static void r4k_flush_cache_range(struct vm_area_struct
*vma
,
508 unsigned long start
, unsigned long end
)
510 int exec
= vma
->vm_flags
& VM_EXEC
;
512 if (cpu_has_dc_aliases
|| exec
)
513 r4k_on_each_cpu(local_r4k_flush_cache_range
, vma
);
516 static inline void local_r4k_flush_cache_mm(void * args
)
518 struct mm_struct
*mm
= args
;
520 if (!has_valid_asid(mm
))
524 * Kludge alert. For obscure reasons R4000SC and R4400SC go nuts if we
525 * only flush the primary caches but R1x000 behave sane ...
526 * R4000SC and R4400SC indexed S-cache ops also invalidate primary
527 * caches, so we can bail out early.
529 if (current_cpu_type() == CPU_R4000SC
||
530 current_cpu_type() == CPU_R4000MC
||
531 current_cpu_type() == CPU_R4400SC
||
532 current_cpu_type() == CPU_R4400MC
) {
540 static void r4k_flush_cache_mm(struct mm_struct
*mm
)
542 if (!cpu_has_dc_aliases
)
545 r4k_on_each_cpu(local_r4k_flush_cache_mm
, mm
);
548 struct flush_cache_page_args
{
549 struct vm_area_struct
*vma
;
554 static inline void local_r4k_flush_cache_page(void *args
)
556 struct flush_cache_page_args
*fcp_args
= args
;
557 struct vm_area_struct
*vma
= fcp_args
->vma
;
558 unsigned long addr
= fcp_args
->addr
;
559 struct page
*page
= pfn_to_page(fcp_args
->pfn
);
560 int exec
= vma
->vm_flags
& VM_EXEC
;
561 struct mm_struct
*mm
= vma
->vm_mm
;
562 int map_coherent
= 0;
570 * If ownes no valid ASID yet, cannot possibly have gotten
571 * this page into the cache.
573 if (!has_valid_asid(mm
))
577 pgdp
= pgd_offset(mm
, addr
);
578 pudp
= pud_offset(pgdp
, addr
);
579 pmdp
= pmd_offset(pudp
, addr
);
580 ptep
= pte_offset(pmdp
, addr
);
583 * If the page isn't marked valid, the page cannot possibly be
586 if (!(pte_present(*ptep
)))
589 if ((mm
== current
->active_mm
) && (pte_val(*ptep
) & _PAGE_VALID
))
593 * Use kmap_coherent or kmap_atomic to do flushes for
594 * another ASID than the current one.
596 map_coherent
= (cpu_has_dc_aliases
&&
597 page_mapcount(page
) &&
598 !Page_dcache_dirty(page
));
600 vaddr
= kmap_coherent(page
, addr
);
602 vaddr
= kmap_atomic(page
);
603 addr
= (unsigned long)vaddr
;
606 if (cpu_has_dc_aliases
|| (exec
&& !cpu_has_ic_fills_f_dc
)) {
607 vaddr
? r4k_blast_dcache_page(addr
) :
608 r4k_blast_dcache_user_page(addr
);
609 if (exec
&& !cpu_icache_snoops_remote_store
)
610 r4k_blast_scache_page(addr
);
613 if (vaddr
&& cpu_has_vtag_icache
&& mm
== current
->active_mm
) {
614 int cpu
= smp_processor_id();
616 if (cpu_context(cpu
, mm
) != 0)
617 drop_mmu_context(mm
, cpu
);
619 vaddr
? r4k_blast_icache_page(addr
) :
620 r4k_blast_icache_user_page(addr
);
627 kunmap_atomic(vaddr
);
631 static void r4k_flush_cache_page(struct vm_area_struct
*vma
,
632 unsigned long addr
, unsigned long pfn
)
634 struct flush_cache_page_args args
;
640 r4k_on_each_cpu(local_r4k_flush_cache_page
, &args
);
643 static inline void local_r4k_flush_data_cache_page(void * addr
)
645 r4k_blast_dcache_page((unsigned long) addr
);
648 static void r4k_flush_data_cache_page(unsigned long addr
)
651 local_r4k_flush_data_cache_page((void *)addr
);
653 r4k_on_each_cpu(local_r4k_flush_data_cache_page
, (void *) addr
);
656 struct flush_icache_range_args
{
661 static inline void local_r4k_flush_icache_range(unsigned long start
, unsigned long end
)
663 if (!cpu_has_ic_fills_f_dc
) {
664 if (end
- start
>= dcache_size
) {
667 R4600_HIT_CACHEOP_WAR_IMPL
;
668 protected_blast_dcache_range(start
, end
);
672 if (end
- start
> icache_size
)
675 switch (boot_cpu_type()) {
677 protected_loongson2_blast_icache_range(start
, end
);
681 protected_blast_icache_range(start
, end
);
687 * Due to all possible segment mappings, there might cache aliases
688 * caused by the bootloader being in non-EVA mode, and the CPU switching
689 * to EVA during early kernel init. It's best to flush the scache
690 * to avoid having secondary cores fetching stale data and lead to
693 bc_wback_inv(start
, (end
- start
));
698 static inline void local_r4k_flush_icache_range_ipi(void *args
)
700 struct flush_icache_range_args
*fir_args
= args
;
701 unsigned long start
= fir_args
->start
;
702 unsigned long end
= fir_args
->end
;
704 local_r4k_flush_icache_range(start
, end
);
707 static void r4k_flush_icache_range(unsigned long start
, unsigned long end
)
709 struct flush_icache_range_args args
;
714 r4k_on_each_cpu(local_r4k_flush_icache_range_ipi
, &args
);
715 instruction_hazard();
718 #if defined(CONFIG_DMA_NONCOHERENT) || defined(CONFIG_DMA_MAYBE_COHERENT)
720 static void r4k_dma_cache_wback_inv(unsigned long addr
, unsigned long size
)
722 /* Catch bad driver code */
726 if (cpu_has_inclusive_pcaches
) {
727 if (size
>= scache_size
)
730 blast_scache_range(addr
, addr
+ size
);
737 * Either no secondary cache or the available caches don't have the
738 * subset property so we have to flush the primary caches
741 if (size
>= dcache_size
) {
744 R4600_HIT_CACHEOP_WAR_IMPL
;
745 blast_dcache_range(addr
, addr
+ size
);
749 bc_wback_inv(addr
, size
);
753 static void r4k_dma_cache_inv(unsigned long addr
, unsigned long size
)
755 /* Catch bad driver code */
759 if (cpu_has_inclusive_pcaches
) {
760 if (size
>= scache_size
)
764 * There is no clearly documented alignment requirement
765 * for the cache instruction on MIPS processors and
766 * some processors, among them the RM5200 and RM7000
767 * QED processors will throw an address error for cache
768 * hit ops with insufficient alignment. Solved by
769 * aligning the address to cache line size.
771 blast_inv_scache_range(addr
, addr
+ size
);
778 if (size
>= dcache_size
) {
781 R4600_HIT_CACHEOP_WAR_IMPL
;
782 blast_inv_dcache_range(addr
, addr
+ size
);
789 #endif /* CONFIG_DMA_NONCOHERENT || CONFIG_DMA_MAYBE_COHERENT */
792 * While we're protected against bad userland addresses we don't care
793 * very much about what happens in that case. Usually a segmentation
794 * fault will dump the process later on anyway ...
796 static void local_r4k_flush_cache_sigtramp(void * arg
)
798 unsigned long ic_lsize
= cpu_icache_line_size();
799 unsigned long dc_lsize
= cpu_dcache_line_size();
800 unsigned long sc_lsize
= cpu_scache_line_size();
801 unsigned long addr
= (unsigned long) arg
;
803 R4600_HIT_CACHEOP_WAR_IMPL
;
805 protected_writeback_dcache_line(addr
& ~(dc_lsize
- 1));
806 if (!cpu_icache_snoops_remote_store
&& scache_size
)
807 protected_writeback_scache_line(addr
& ~(sc_lsize
- 1));
809 protected_flush_icache_line(addr
& ~(ic_lsize
- 1));
810 if (MIPS4K_ICACHE_REFILL_WAR
) {
811 __asm__
__volatile__ (
814 ".set "MIPS_ISA_LEVEL
"\n\t"
826 : "i" (Hit_Invalidate_I
));
828 if (MIPS_CACHE_SYNC_WAR
)
829 __asm__
__volatile__ ("sync");
832 static void r4k_flush_cache_sigtramp(unsigned long addr
)
834 r4k_on_each_cpu(local_r4k_flush_cache_sigtramp
, (void *) addr
);
837 static void r4k_flush_icache_all(void)
839 if (cpu_has_vtag_icache
)
843 struct flush_kernel_vmap_range_args
{
848 static inline void local_r4k_flush_kernel_vmap_range(void *args
)
850 struct flush_kernel_vmap_range_args
*vmra
= args
;
851 unsigned long vaddr
= vmra
->vaddr
;
852 int size
= vmra
->size
;
855 * Aliases only affect the primary caches so don't bother with
856 * S-caches or T-caches.
858 if (size
>= dcache_size
)
861 R4600_HIT_CACHEOP_WAR_IMPL
;
862 blast_dcache_range(vaddr
, vaddr
+ size
);
866 static void r4k_flush_kernel_vmap_range(unsigned long vaddr
, int size
)
868 struct flush_kernel_vmap_range_args args
;
870 args
.vaddr
= (unsigned long) vaddr
;
873 r4k_on_each_cpu(local_r4k_flush_kernel_vmap_range
, &args
);
876 static inline void rm7k_erratum31(void)
878 const unsigned long ic_lsize
= 32;
881 /* RM7000 erratum #31. The icache is screwed at startup. */
885 for (addr
= INDEX_BASE
; addr
<= INDEX_BASE
+ 4096; addr
+= ic_lsize
) {
886 __asm__
__volatile__ (
890 "cache\t%1, 0(%0)\n\t"
891 "cache\t%1, 0x1000(%0)\n\t"
892 "cache\t%1, 0x2000(%0)\n\t"
893 "cache\t%1, 0x3000(%0)\n\t"
894 "cache\t%2, 0(%0)\n\t"
895 "cache\t%2, 0x1000(%0)\n\t"
896 "cache\t%2, 0x2000(%0)\n\t"
897 "cache\t%2, 0x3000(%0)\n\t"
898 "cache\t%1, 0(%0)\n\t"
899 "cache\t%1, 0x1000(%0)\n\t"
900 "cache\t%1, 0x2000(%0)\n\t"
901 "cache\t%1, 0x3000(%0)\n\t"
904 : "r" (addr
), "i" (Index_Store_Tag_I
), "i" (Fill
));
908 static inline int alias_74k_erratum(struct cpuinfo_mips
*c
)
910 unsigned int imp
= c
->processor_id
& PRID_IMP_MASK
;
911 unsigned int rev
= c
->processor_id
& PRID_REV_MASK
;
915 * Early versions of the 74K do not update the cache tags on a
916 * vtag miss/ptag hit which can occur in the case of KSEG0/KUSEG
917 * aliases. In this case it is better to treat the cache as always
918 * having aliases. Also disable the synonym tag update feature
919 * where available. In this case no opportunistic tag update will
920 * happen where a load causes a virtual address miss but a physical
921 * address hit during a D-cache look-up.
925 if (rev
<= PRID_REV_ENCODE_332(2, 4, 0))
927 if (rev
== PRID_REV_ENCODE_332(2, 4, 0))
928 write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND
);
931 if (rev
<= PRID_REV_ENCODE_332(1, 1, 0)) {
933 write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND
);
943 static void b5k_instruction_hazard(void)
947 __asm__
__volatile__(
948 " nop; nop; nop; nop; nop; nop; nop; nop\n"
949 " nop; nop; nop; nop; nop; nop; nop; nop\n"
950 " nop; nop; nop; nop; nop; nop; nop; nop\n"
951 " nop; nop; nop; nop; nop; nop; nop; nop\n"
955 static char *way_string
[] = { NULL
, "direct mapped", "2-way",
956 "3-way", "4-way", "5-way", "6-way", "7-way", "8-way",
957 "9-way", "10-way", "11-way", "12-way",
958 "13-way", "14-way", "15-way", "16-way",
961 static void probe_pcache(void)
963 struct cpuinfo_mips
*c
= ¤t_cpu_data
;
964 unsigned int config
= read_c0_config();
965 unsigned int prid
= read_c0_prid();
966 int has_74k_erratum
= 0;
967 unsigned long config1
;
970 switch (current_cpu_type()) {
971 case CPU_R4600
: /* QED style two way caches? */
975 icache_size
= 1 << (12 + ((config
& CONF_IC
) >> 9));
976 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
978 c
->icache
.waybit
= __ffs(icache_size
/2);
980 dcache_size
= 1 << (12 + ((config
& CONF_DC
) >> 6));
981 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
983 c
->dcache
.waybit
= __ffs(dcache_size
/2);
985 c
->options
|= MIPS_CPU_CACHE_CDEX_P
;
990 icache_size
= 1 << (12 + ((config
& CONF_IC
) >> 9));
991 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
995 dcache_size
= 1 << (12 + ((config
& CONF_DC
) >> 6));
996 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
998 c
->dcache
.waybit
= 0;
1000 c
->options
|= MIPS_CPU_CACHE_CDEX_P
| MIPS_CPU_PREFETCH
;
1004 icache_size
= 1 << (12 + ((config
& CONF_IC
) >> 9));
1005 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
1007 c
->icache
.waybit
= 0;
1009 dcache_size
= 1 << (12 + ((config
& CONF_DC
) >> 6));
1010 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
1012 c
->dcache
.waybit
= 0;
1014 c
->options
|= MIPS_CPU_CACHE_CDEX_P
;
1015 c
->options
|= MIPS_CPU_PREFETCH
;
1025 icache_size
= 1 << (12 + ((config
& CONF_IC
) >> 9));
1026 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
1028 c
->icache
.waybit
= 0; /* doesn't matter */
1030 dcache_size
= 1 << (12 + ((config
& CONF_DC
) >> 6));
1031 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
1033 c
->dcache
.waybit
= 0; /* does not matter */
1035 c
->options
|= MIPS_CPU_CACHE_CDEX_P
;
1042 icache_size
= 1 << (12 + ((config
& R10K_CONF_IC
) >> 29));
1043 c
->icache
.linesz
= 64;
1045 c
->icache
.waybit
= 0;
1047 dcache_size
= 1 << (12 + ((config
& R10K_CONF_DC
) >> 26));
1048 c
->dcache
.linesz
= 32;
1050 c
->dcache
.waybit
= 0;
1052 c
->options
|= MIPS_CPU_PREFETCH
;
1056 write_c0_config(config
& ~VR41_CONF_P4K
);
1058 /* Workaround for cache instruction bug of VR4131 */
1059 if (c
->processor_id
== 0x0c80U
|| c
->processor_id
== 0x0c81U
||
1060 c
->processor_id
== 0x0c82U
) {
1061 config
|= 0x00400000U
;
1062 if (c
->processor_id
== 0x0c80U
)
1063 config
|= VR41_CONF_BP
;
1064 write_c0_config(config
);
1066 c
->options
|= MIPS_CPU_CACHE_CDEX_P
;
1068 icache_size
= 1 << (10 + ((config
& CONF_IC
) >> 9));
1069 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
1071 c
->icache
.waybit
= __ffs(icache_size
/2);
1073 dcache_size
= 1 << (10 + ((config
& CONF_DC
) >> 6));
1074 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
1076 c
->dcache
.waybit
= __ffs(dcache_size
/2);
1085 icache_size
= 1 << (10 + ((config
& CONF_IC
) >> 9));
1086 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
1088 c
->icache
.waybit
= 0; /* doesn't matter */
1090 dcache_size
= 1 << (10 + ((config
& CONF_DC
) >> 6));
1091 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
1093 c
->dcache
.waybit
= 0; /* does not matter */
1095 c
->options
|= MIPS_CPU_CACHE_CDEX_P
;
1101 icache_size
= 1 << (12 + ((config
& CONF_IC
) >> 9));
1102 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
1104 c
->icache
.waybit
= __ffs(icache_size
/ c
->icache
.ways
);
1106 dcache_size
= 1 << (12 + ((config
& CONF_DC
) >> 6));
1107 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
1109 c
->dcache
.waybit
= __ffs(dcache_size
/ c
->dcache
.ways
);
1111 c
->options
|= MIPS_CPU_CACHE_CDEX_P
;
1112 c
->options
|= MIPS_CPU_PREFETCH
;
1116 icache_size
= 1 << (12 + ((config
& CONF_IC
) >> 9));
1117 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
1122 c
->icache
.waybit
= 0;
1124 dcache_size
= 1 << (12 + ((config
& CONF_DC
) >> 6));
1125 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
1130 c
->dcache
.waybit
= 0;
1134 config1
= read_c0_config1();
1135 lsize
= (config1
>> 19) & 7;
1137 c
->icache
.linesz
= 2 << lsize
;
1139 c
->icache
.linesz
= 0;
1140 c
->icache
.sets
= 64 << ((config1
>> 22) & 7);
1141 c
->icache
.ways
= 1 + ((config1
>> 16) & 7);
1142 icache_size
= c
->icache
.sets
*
1145 c
->icache
.waybit
= 0;
1147 lsize
= (config1
>> 10) & 7;
1149 c
->dcache
.linesz
= 2 << lsize
;
1151 c
->dcache
.linesz
= 0;
1152 c
->dcache
.sets
= 64 << ((config1
>> 13) & 7);
1153 c
->dcache
.ways
= 1 + ((config1
>> 7) & 7);
1154 dcache_size
= c
->dcache
.sets
*
1157 c
->dcache
.waybit
= 0;
1158 if ((prid
& PRID_REV_MASK
) >= PRID_REV_LOONGSON3A_R2
)
1159 c
->options
|= MIPS_CPU_PREFETCH
;
1162 case CPU_CAVIUM_OCTEON3
:
1163 /* For now lie about the number of ways. */
1164 c
->icache
.linesz
= 128;
1165 c
->icache
.sets
= 16;
1167 c
->icache
.flags
|= MIPS_CACHE_VTAG
;
1168 icache_size
= c
->icache
.sets
* c
->icache
.ways
* c
->icache
.linesz
;
1170 c
->dcache
.linesz
= 128;
1173 dcache_size
= c
->dcache
.sets
* c
->dcache
.ways
* c
->dcache
.linesz
;
1174 c
->options
|= MIPS_CPU_PREFETCH
;
1178 if (!(config
& MIPS_CONF_M
))
1179 panic("Don't know how to probe P-caches on this cpu.");
1182 * So we seem to be a MIPS32 or MIPS64 CPU
1183 * So let's probe the I-cache ...
1185 config1
= read_c0_config1();
1187 lsize
= (config1
>> 19) & 7;
1189 /* IL == 7 is reserved */
1191 panic("Invalid icache line size");
1193 c
->icache
.linesz
= lsize
? 2 << lsize
: 0;
1195 c
->icache
.sets
= 32 << (((config1
>> 22) + 1) & 7);
1196 c
->icache
.ways
= 1 + ((config1
>> 16) & 7);
1198 icache_size
= c
->icache
.sets
*
1201 c
->icache
.waybit
= __ffs(icache_size
/c
->icache
.ways
);
1203 if (config
& 0x8) /* VI bit */
1204 c
->icache
.flags
|= MIPS_CACHE_VTAG
;
1207 * Now probe the MIPS32 / MIPS64 data cache.
1209 c
->dcache
.flags
= 0;
1211 lsize
= (config1
>> 10) & 7;
1213 /* DL == 7 is reserved */
1215 panic("Invalid dcache line size");
1217 c
->dcache
.linesz
= lsize
? 2 << lsize
: 0;
1219 c
->dcache
.sets
= 32 << (((config1
>> 13) + 1) & 7);
1220 c
->dcache
.ways
= 1 + ((config1
>> 7) & 7);
1222 dcache_size
= c
->dcache
.sets
*
1225 c
->dcache
.waybit
= __ffs(dcache_size
/c
->dcache
.ways
);
1227 c
->options
|= MIPS_CPU_PREFETCH
;
1232 * Processor configuration sanity check for the R4000SC erratum
1233 * #5. With page sizes larger than 32kB there is no possibility
1234 * to get a VCE exception anymore so we don't care about this
1235 * misconfiguration. The case is rather theoretical anyway;
1236 * presumably no vendor is shipping his hardware in the "bad"
1239 if ((prid
& PRID_IMP_MASK
) == PRID_IMP_R4000
&&
1240 (prid
& PRID_REV_MASK
) < PRID_REV_R4400
&&
1241 !(config
& CONF_SC
) && c
->icache
.linesz
!= 16 &&
1242 PAGE_SIZE
<= 0x8000)
1243 panic("Improper R4000SC processor configuration detected");
1245 /* compute a couple of other cache variables */
1246 c
->icache
.waysize
= icache_size
/ c
->icache
.ways
;
1247 c
->dcache
.waysize
= dcache_size
/ c
->dcache
.ways
;
1249 c
->icache
.sets
= c
->icache
.linesz
?
1250 icache_size
/ (c
->icache
.linesz
* c
->icache
.ways
) : 0;
1251 c
->dcache
.sets
= c
->dcache
.linesz
?
1252 dcache_size
/ (c
->dcache
.linesz
* c
->dcache
.ways
) : 0;
1255 * R1x000 P-caches are odd in a positive way. They're 32kB 2-way
1256 * virtually indexed so normally would suffer from aliases. So
1257 * normally they'd suffer from aliases but magic in the hardware deals
1258 * with that for us so we don't need to take care ourselves.
1260 switch (current_cpu_type()) {
1266 c
->dcache
.flags
|= MIPS_CACHE_PINDEX
;
1277 has_74k_erratum
= alias_74k_erratum(c
);
1284 case CPU_INTERAPTIV
:
1288 case CPU_QEMU_GENERIC
:
1292 if (!(read_c0_config7() & MIPS_CONF7_IAR
) &&
1293 (c
->icache
.waysize
> PAGE_SIZE
))
1294 c
->icache
.flags
|= MIPS_CACHE_ALIASES
;
1295 if (!has_74k_erratum
&& (read_c0_config7() & MIPS_CONF7_AR
)) {
1297 * Effectively physically indexed dcache,
1298 * thus no virtual aliases.
1300 c
->dcache
.flags
|= MIPS_CACHE_PINDEX
;
1304 if (has_74k_erratum
|| c
->dcache
.waysize
> PAGE_SIZE
)
1305 c
->dcache
.flags
|= MIPS_CACHE_ALIASES
;
1308 switch (current_cpu_type()) {
1311 * Some older 20Kc chips doesn't have the 'VI' bit in
1312 * the config register.
1314 c
->icache
.flags
|= MIPS_CACHE_VTAG
;
1319 c
->icache
.flags
|= MIPS_CACHE_IC_F_DC
;
1323 c
->icache
.flags
|= MIPS_CACHE_IC_F_DC
;
1324 /* Cache aliases are handled in hardware; allow HIGHMEM */
1325 c
->dcache
.flags
&= ~MIPS_CACHE_ALIASES
;
1330 * LOONGSON2 has 4 way icache, but when using indexed cache op,
1331 * one op will act on all 4 ways
1336 printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
1338 c
->icache
.flags
& MIPS_CACHE_VTAG
? "VIVT" : "VIPT",
1339 way_string
[c
->icache
.ways
], c
->icache
.linesz
);
1341 printk("Primary data cache %ldkB, %s, %s, %s, linesize %d bytes\n",
1342 dcache_size
>> 10, way_string
[c
->dcache
.ways
],
1343 (c
->dcache
.flags
& MIPS_CACHE_PINDEX
) ? "PIPT" : "VIPT",
1344 (c
->dcache
.flags
& MIPS_CACHE_ALIASES
) ?
1345 "cache aliases" : "no aliases",
1349 static void probe_vcache(void)
1351 struct cpuinfo_mips
*c
= ¤t_cpu_data
;
1352 unsigned int config2
, lsize
;
1354 if (current_cpu_type() != CPU_LOONGSON3
)
1357 config2
= read_c0_config2();
1358 if ((lsize
= ((config2
>> 20) & 15)))
1359 c
->vcache
.linesz
= 2 << lsize
;
1361 c
->vcache
.linesz
= lsize
;
1363 c
->vcache
.sets
= 64 << ((config2
>> 24) & 15);
1364 c
->vcache
.ways
= 1 + ((config2
>> 16) & 15);
1366 vcache_size
= c
->vcache
.sets
* c
->vcache
.ways
* c
->vcache
.linesz
;
1368 c
->vcache
.waybit
= 0;
1370 pr_info("Unified victim cache %ldkB %s, linesize %d bytes.\n",
1371 vcache_size
>> 10, way_string
[c
->vcache
.ways
], c
->vcache
.linesz
);
1375 * If you even _breathe_ on this function, look at the gcc output and make sure
1376 * it does not pop things on and off the stack for the cache sizing loop that
1377 * executes in KSEG1 space or else you will crash and burn badly. You have
1380 static int probe_scache(void)
1382 unsigned long flags
, addr
, begin
, end
, pow2
;
1383 unsigned int config
= read_c0_config();
1384 struct cpuinfo_mips
*c
= ¤t_cpu_data
;
1386 if (config
& CONF_SC
)
1389 begin
= (unsigned long) &_stext
;
1390 begin
&= ~((4 * 1024 * 1024) - 1);
1391 end
= begin
+ (4 * 1024 * 1024);
1394 * This is such a bitch, you'd think they would make it easy to do
1395 * this. Away you daemons of stupidity!
1397 local_irq_save(flags
);
1399 /* Fill each size-multiple cache line with a valid tag. */
1401 for (addr
= begin
; addr
< end
; addr
= (begin
+ pow2
)) {
1402 unsigned long *p
= (unsigned long *) addr
;
1403 __asm__
__volatile__("nop" : : "r" (*p
)); /* whee... */
1407 /* Load first line with zero (therefore invalid) tag. */
1410 __asm__
__volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
1411 cache_op(Index_Store_Tag_I
, begin
);
1412 cache_op(Index_Store_Tag_D
, begin
);
1413 cache_op(Index_Store_Tag_SD
, begin
);
1415 /* Now search for the wrap around point. */
1416 pow2
= (128 * 1024);
1417 for (addr
= begin
+ (128 * 1024); addr
< end
; addr
= begin
+ pow2
) {
1418 cache_op(Index_Load_Tag_SD
, addr
);
1419 __asm__
__volatile__("nop; nop; nop; nop;"); /* hazard... */
1420 if (!read_c0_taglo())
1424 local_irq_restore(flags
);
1428 c
->scache
.linesz
= 16 << ((config
& R4K_CONF_SB
) >> 22);
1430 c
->scache
.waybit
= 0; /* does not matter */
1435 static void __init
loongson2_sc_init(void)
1437 struct cpuinfo_mips
*c
= ¤t_cpu_data
;
1439 scache_size
= 512*1024;
1440 c
->scache
.linesz
= 32;
1442 c
->scache
.waybit
= 0;
1443 c
->scache
.waysize
= scache_size
/ (c
->scache
.ways
);
1444 c
->scache
.sets
= scache_size
/ (c
->scache
.linesz
* c
->scache
.ways
);
1445 pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1446 scache_size
>> 10, way_string
[c
->scache
.ways
], c
->scache
.linesz
);
1448 c
->options
|= MIPS_CPU_INCLUSIVE_CACHES
;
1451 static void __init
loongson3_sc_init(void)
1453 struct cpuinfo_mips
*c
= ¤t_cpu_data
;
1454 unsigned int config2
, lsize
;
1456 config2
= read_c0_config2();
1457 lsize
= (config2
>> 4) & 15;
1459 c
->scache
.linesz
= 2 << lsize
;
1461 c
->scache
.linesz
= 0;
1462 c
->scache
.sets
= 64 << ((config2
>> 8) & 15);
1463 c
->scache
.ways
= 1 + (config2
& 15);
1465 scache_size
= c
->scache
.sets
*
1468 /* Loongson-3 has 4 cores, 1MB scache for each. scaches are shared */
1470 c
->scache
.waybit
= 0;
1471 pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1472 scache_size
>> 10, way_string
[c
->scache
.ways
], c
->scache
.linesz
);
1474 c
->options
|= MIPS_CPU_INCLUSIVE_CACHES
;
1478 extern int r5k_sc_init(void);
1479 extern int rm7k_sc_init(void);
1480 extern int mips_sc_init(void);
1482 static void setup_scache(void)
1484 struct cpuinfo_mips
*c
= ¤t_cpu_data
;
1485 unsigned int config
= read_c0_config();
1489 * Do the probing thing on R4000SC and R4400SC processors. Other
1490 * processors don't have a S-cache that would be relevant to the
1491 * Linux memory management.
1493 switch (current_cpu_type()) {
1498 sc_present
= run_uncached(probe_scache
);
1500 c
->options
|= MIPS_CPU_CACHE_CDEX_S
;
1507 scache_size
= 0x80000 << ((config
& R10K_CONF_SS
) >> 16);
1508 c
->scache
.linesz
= 64 << ((config
>> 13) & 1);
1510 c
->scache
.waybit
= 0;
1516 #ifdef CONFIG_R5000_CPU_SCACHE
1522 #ifdef CONFIG_RM7000_CPU_SCACHE
1528 loongson2_sc_init();
1532 loongson3_sc_init();
1535 case CPU_CAVIUM_OCTEON3
:
1537 /* don't need to worry about L2, fully coherent */
1541 if (c
->isa_level
& (MIPS_CPU_ISA_M32R1
| MIPS_CPU_ISA_M32R2
|
1542 MIPS_CPU_ISA_M32R6
| MIPS_CPU_ISA_M64R1
|
1543 MIPS_CPU_ISA_M64R2
| MIPS_CPU_ISA_M64R6
)) {
1544 #ifdef CONFIG_MIPS_CPU_SCACHE
1545 if (mips_sc_init ()) {
1546 scache_size
= c
->scache
.ways
* c
->scache
.sets
* c
->scache
.linesz
;
1547 printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n",
1549 way_string
[c
->scache
.ways
], c
->scache
.linesz
);
1552 if (!(c
->scache
.flags
& MIPS_CACHE_NOT_PRESENT
))
1553 panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
1563 /* compute a couple of other cache variables */
1564 c
->scache
.waysize
= scache_size
/ c
->scache
.ways
;
1566 c
->scache
.sets
= scache_size
/ (c
->scache
.linesz
* c
->scache
.ways
);
1568 printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1569 scache_size
>> 10, way_string
[c
->scache
.ways
], c
->scache
.linesz
);
1571 c
->options
|= MIPS_CPU_INCLUSIVE_CACHES
;
1574 void au1x00_fixup_config_od(void)
1577 * c0_config.od (bit 19) was write only (and read as 0)
1578 * on the early revisions of Alchemy SOCs. It disables the bus
1579 * transaction overlapping and needs to be set to fix various errata.
1581 switch (read_c0_prid()) {
1582 case 0x00030100: /* Au1000 DA */
1583 case 0x00030201: /* Au1000 HA */
1584 case 0x00030202: /* Au1000 HB */
1585 case 0x01030200: /* Au1500 AB */
1587 * Au1100 errata actually keeps silence about this bit, so we set it
1588 * just in case for those revisions that require it to be set according
1589 * to the (now gone) cpu table.
1591 case 0x02030200: /* Au1100 AB */
1592 case 0x02030201: /* Au1100 BA */
1593 case 0x02030202: /* Au1100 BC */
1594 set_c0_config(1 << 19);
1599 /* CP0 hazard avoidance. */
1600 #define NXP_BARRIER() \
1601 __asm__ __volatile__( \
1602 ".set noreorder\n\t" \
1603 "nop; nop; nop; nop; nop; nop;\n\t" \
1606 static void nxp_pr4450_fixup_config(void)
1608 unsigned long config0
;
1610 config0
= read_c0_config();
1612 /* clear all three cache coherency fields */
1613 config0
&= ~(0x7 | (7 << 25) | (7 << 28));
1614 config0
|= (((_page_cachable_default
>> _CACHE_SHIFT
) << 0) |
1615 ((_page_cachable_default
>> _CACHE_SHIFT
) << 25) |
1616 ((_page_cachable_default
>> _CACHE_SHIFT
) << 28));
1617 write_c0_config(config0
);
1621 static int cca
= -1;
1623 static int __init
cca_setup(char *str
)
1625 get_option(&str
, &cca
);
1630 early_param("cca", cca_setup
);
1632 static void coherency_setup(void)
1634 if (cca
< 0 || cca
> 7)
1635 cca
= read_c0_config() & CONF_CM_CMASK
;
1636 _page_cachable_default
= cca
<< _CACHE_SHIFT
;
1638 pr_debug("Using cache attribute %d\n", cca
);
1639 change_c0_config(CONF_CM_CMASK
, cca
);
1642 * c0_status.cu=0 specifies that updates by the sc instruction use
1643 * the coherency mode specified by the TLB; 1 means cachable
1644 * coherent update on write will be used. Not all processors have
1645 * this bit and; some wire it to zero, others like Toshiba had the
1646 * silly idea of putting something else there ...
1648 switch (current_cpu_type()) {
1655 clear_c0_config(CONF_CU
);
1658 * We need to catch the early Alchemy SOCs with
1659 * the write-only co_config.od bit and set it back to one on:
1660 * Au1000 rev DA, HA, HB; Au1100 AB, BA, BC, Au1500 AB
1663 au1x00_fixup_config_od();
1666 case PRID_IMP_PR4450
:
1667 nxp_pr4450_fixup_config();
1672 static void r4k_cache_error_setup(void)
1674 extern char __weak except_vec2_generic
;
1675 extern char __weak except_vec2_sb1
;
1677 switch (current_cpu_type()) {
1680 set_uncached_handler(0x100, &except_vec2_sb1
, 0x80);
1684 set_uncached_handler(0x100, &except_vec2_generic
, 0x80);
1689 void r4k_cache_init(void)
1691 extern void build_clear_page(void);
1692 extern void build_copy_page(void);
1693 struct cpuinfo_mips
*c
= ¤t_cpu_data
;
1699 r4k_blast_dcache_page_setup();
1700 r4k_blast_dcache_page_indexed_setup();
1701 r4k_blast_dcache_setup();
1702 r4k_blast_icache_page_setup();
1703 r4k_blast_icache_page_indexed_setup();
1704 r4k_blast_icache_setup();
1705 r4k_blast_scache_page_setup();
1706 r4k_blast_scache_page_indexed_setup();
1707 r4k_blast_scache_setup();
1709 r4k_blast_dcache_user_page_setup();
1710 r4k_blast_icache_user_page_setup();
1714 * Some MIPS32 and MIPS64 processors have physically indexed caches.
1715 * This code supports virtually indexed processors and will be
1716 * unnecessarily inefficient on physically indexed processors.
1718 if (c
->dcache
.linesz
&& cpu_has_dc_aliases
)
1719 shm_align_mask
= max_t( unsigned long,
1720 c
->dcache
.sets
* c
->dcache
.linesz
- 1,
1723 shm_align_mask
= PAGE_SIZE
-1;
1725 __flush_cache_vmap
= r4k__flush_cache_vmap
;
1726 __flush_cache_vunmap
= r4k__flush_cache_vunmap
;
1728 flush_cache_all
= cache_noop
;
1729 __flush_cache_all
= r4k___flush_cache_all
;
1730 flush_cache_mm
= r4k_flush_cache_mm
;
1731 flush_cache_page
= r4k_flush_cache_page
;
1732 flush_cache_range
= r4k_flush_cache_range
;
1734 __flush_kernel_vmap_range
= r4k_flush_kernel_vmap_range
;
1736 flush_cache_sigtramp
= r4k_flush_cache_sigtramp
;
1737 flush_icache_all
= r4k_flush_icache_all
;
1738 local_flush_data_cache_page
= local_r4k_flush_data_cache_page
;
1739 flush_data_cache_page
= r4k_flush_data_cache_page
;
1740 flush_icache_range
= r4k_flush_icache_range
;
1741 local_flush_icache_range
= local_r4k_flush_icache_range
;
1743 #if defined(CONFIG_DMA_NONCOHERENT) || defined(CONFIG_DMA_MAYBE_COHERENT)
1745 _dma_cache_wback_inv
= (void *)cache_noop
;
1746 _dma_cache_wback
= (void *)cache_noop
;
1747 _dma_cache_inv
= (void *)cache_noop
;
1749 _dma_cache_wback_inv
= r4k_dma_cache_wback_inv
;
1750 _dma_cache_wback
= r4k_dma_cache_wback_inv
;
1751 _dma_cache_inv
= r4k_dma_cache_inv
;
1759 * We want to run CMP kernels on core with and without coherent
1760 * caches. Therefore, do not use CONFIG_MIPS_CMP to decide whether
1761 * or not to flush caches.
1763 local_r4k___flush_cache_all(NULL
);
1766 board_cache_error_setup
= r4k_cache_error_setup
;
1771 switch (current_cpu_type()) {
1774 /* No IPI is needed because all CPUs share the same D$ */
1775 flush_data_cache_page
= r4k_blast_dcache_page
;
1778 /* We lose our superpowers if L2 is disabled */
1779 if (c
->scache
.flags
& MIPS_CACHE_NOT_PRESENT
)
1782 /* I$ fills from D$ just by emptying the write buffers */
1783 flush_cache_page
= (void *)b5k_instruction_hazard
;
1784 flush_cache_range
= (void *)b5k_instruction_hazard
;
1785 flush_cache_sigtramp
= (void *)b5k_instruction_hazard
;
1786 local_flush_data_cache_page
= (void *)b5k_instruction_hazard
;
1787 flush_data_cache_page
= (void *)b5k_instruction_hazard
;
1788 flush_icache_range
= (void *)b5k_instruction_hazard
;
1789 local_flush_icache_range
= (void *)b5k_instruction_hazard
;
1792 /* Optimization: an L2 flush implicitly flushes the L1 */
1793 current_cpu_data
.options
|= MIPS_CPU_INCLUSIVE_CACHES
;
1796 /* Loongson-3 maintains cache coherency by hardware */
1797 __flush_cache_all
= cache_noop
;
1798 __flush_cache_vmap
= cache_noop
;
1799 __flush_cache_vunmap
= cache_noop
;
1800 __flush_kernel_vmap_range
= (void *)cache_noop
;
1801 flush_cache_mm
= (void *)cache_noop
;
1802 flush_cache_page
= (void *)cache_noop
;
1803 flush_cache_range
= (void *)cache_noop
;
1804 flush_cache_sigtramp
= (void *)cache_noop
;
1805 flush_icache_all
= (void *)cache_noop
;
1806 flush_data_cache_page
= (void *)cache_noop
;
1807 local_flush_data_cache_page
= (void *)cache_noop
;
1812 static int r4k_cache_pm_notifier(struct notifier_block
*self
, unsigned long cmd
,
1816 case CPU_PM_ENTER_FAILED
:
1825 static struct notifier_block r4k_cache_pm_notifier_block
= {
1826 .notifier_call
= r4k_cache_pm_notifier
,
1829 int __init
r4k_cache_init_pm(void)
1831 return cpu_pm_register_notifier(&r4k_cache_pm_notifier_block
);
1833 arch_initcall(r4k_cache_init_pm
);