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/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>
18 #include <linux/module.h>
19 #include <linux/bitops.h>
21 #include <asm/bcache.h>
22 #include <asm/bootinfo.h>
23 #include <asm/cache.h>
24 #include <asm/cacheops.h>
26 #include <asm/cpu-features.h>
29 #include <asm/pgtable.h>
30 #include <asm/r4kcache.h>
31 #include <asm/sections.h>
32 #include <asm/mmu_context.h>
34 #include <asm/cacheflush.h> /* for run_uncached() */
35 #include <asm/traps.h>
38 * Special Variant of smp_call_function for use by cache functions:
41 * o collapses to normal function call on UP kernels
42 * o collapses to normal function call on systems with a single shared
44 * o doesn't disable interrupts on the local CPU
46 static inline void r4k_on_each_cpu(void (*func
) (void *info
), void *info
)
50 #if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC)
51 smp_call_function(func
, info
, 1);
57 #if defined(CONFIG_MIPS_CMP)
58 #define cpu_has_safe_index_cacheops 0
60 #define cpu_has_safe_index_cacheops 1
66 static unsigned long icache_size __read_mostly
;
67 static unsigned long dcache_size __read_mostly
;
68 static unsigned long scache_size __read_mostly
;
71 * Dummy cache handling routines for machines without boardcaches
73 static void cache_noop(void) {}
75 static struct bcache_ops no_sc_ops
= {
76 .bc_enable
= (void *)cache_noop
,
77 .bc_disable
= (void *)cache_noop
,
78 .bc_wback_inv
= (void *)cache_noop
,
79 .bc_inv
= (void *)cache_noop
82 struct bcache_ops
*bcops
= &no_sc_ops
;
84 #define cpu_is_r4600_v1_x() ((read_c0_prid() & 0xfffffff0) == 0x00002010)
85 #define cpu_is_r4600_v2_x() ((read_c0_prid() & 0xfffffff0) == 0x00002020)
87 #define R4600_HIT_CACHEOP_WAR_IMPL \
89 if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x()) \
90 *(volatile unsigned long *)CKSEG1; \
91 if (R4600_V1_HIT_CACHEOP_WAR) \
92 __asm__ __volatile__("nop;nop;nop;nop"); \
95 static void (*r4k_blast_dcache_page
)(unsigned long addr
);
97 static inline void r4k_blast_dcache_page_dc32(unsigned long addr
)
99 R4600_HIT_CACHEOP_WAR_IMPL
;
100 blast_dcache32_page(addr
);
103 static inline void r4k_blast_dcache_page_dc64(unsigned long addr
)
105 R4600_HIT_CACHEOP_WAR_IMPL
;
106 blast_dcache64_page(addr
);
109 static void __cpuinit
r4k_blast_dcache_page_setup(void)
111 unsigned long dc_lsize
= cpu_dcache_line_size();
114 r4k_blast_dcache_page
= (void *)cache_noop
;
115 else if (dc_lsize
== 16)
116 r4k_blast_dcache_page
= blast_dcache16_page
;
117 else if (dc_lsize
== 32)
118 r4k_blast_dcache_page
= r4k_blast_dcache_page_dc32
;
119 else if (dc_lsize
== 64)
120 r4k_blast_dcache_page
= r4k_blast_dcache_page_dc64
;
123 static void (* r4k_blast_dcache_page_indexed
)(unsigned long addr
);
125 static void __cpuinit
r4k_blast_dcache_page_indexed_setup(void)
127 unsigned long dc_lsize
= cpu_dcache_line_size();
130 r4k_blast_dcache_page_indexed
= (void *)cache_noop
;
131 else if (dc_lsize
== 16)
132 r4k_blast_dcache_page_indexed
= blast_dcache16_page_indexed
;
133 else if (dc_lsize
== 32)
134 r4k_blast_dcache_page_indexed
= blast_dcache32_page_indexed
;
135 else if (dc_lsize
== 64)
136 r4k_blast_dcache_page_indexed
= blast_dcache64_page_indexed
;
139 static void (* r4k_blast_dcache
)(void);
141 static void __cpuinit
r4k_blast_dcache_setup(void)
143 unsigned long dc_lsize
= cpu_dcache_line_size();
146 r4k_blast_dcache
= (void *)cache_noop
;
147 else if (dc_lsize
== 16)
148 r4k_blast_dcache
= blast_dcache16
;
149 else if (dc_lsize
== 32)
150 r4k_blast_dcache
= blast_dcache32
;
151 else if (dc_lsize
== 64)
152 r4k_blast_dcache
= blast_dcache64
;
155 /* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
156 #define JUMP_TO_ALIGN(order) \
157 __asm__ __volatile__( \
159 ".align\t" #order "\n\t" \
162 #define CACHE32_UNROLL32_ALIGN JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
163 #define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
165 static inline void blast_r4600_v1_icache32(void)
169 local_irq_save(flags
);
171 local_irq_restore(flags
);
174 static inline void tx49_blast_icache32(void)
176 unsigned long start
= INDEX_BASE
;
177 unsigned long end
= start
+ current_cpu_data
.icache
.waysize
;
178 unsigned long ws_inc
= 1UL << current_cpu_data
.icache
.waybit
;
179 unsigned long ws_end
= current_cpu_data
.icache
.ways
<<
180 current_cpu_data
.icache
.waybit
;
181 unsigned long ws
, addr
;
183 CACHE32_UNROLL32_ALIGN2
;
184 /* I'm in even chunk. blast odd chunks */
185 for (ws
= 0; ws
< ws_end
; ws
+= ws_inc
)
186 for (addr
= start
+ 0x400; addr
< end
; addr
+= 0x400 * 2)
187 cache32_unroll32(addr
|ws
, Index_Invalidate_I
);
188 CACHE32_UNROLL32_ALIGN
;
189 /* I'm in odd chunk. blast even chunks */
190 for (ws
= 0; ws
< ws_end
; ws
+= ws_inc
)
191 for (addr
= start
; addr
< end
; addr
+= 0x400 * 2)
192 cache32_unroll32(addr
|ws
, Index_Invalidate_I
);
195 static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page
)
199 local_irq_save(flags
);
200 blast_icache32_page_indexed(page
);
201 local_irq_restore(flags
);
204 static inline void tx49_blast_icache32_page_indexed(unsigned long page
)
206 unsigned long indexmask
= current_cpu_data
.icache
.waysize
- 1;
207 unsigned long start
= INDEX_BASE
+ (page
& indexmask
);
208 unsigned long end
= start
+ PAGE_SIZE
;
209 unsigned long ws_inc
= 1UL << current_cpu_data
.icache
.waybit
;
210 unsigned long ws_end
= current_cpu_data
.icache
.ways
<<
211 current_cpu_data
.icache
.waybit
;
212 unsigned long ws
, addr
;
214 CACHE32_UNROLL32_ALIGN2
;
215 /* I'm in even chunk. blast odd chunks */
216 for (ws
= 0; ws
< ws_end
; ws
+= ws_inc
)
217 for (addr
= start
+ 0x400; addr
< end
; addr
+= 0x400 * 2)
218 cache32_unroll32(addr
|ws
, Index_Invalidate_I
);
219 CACHE32_UNROLL32_ALIGN
;
220 /* I'm in odd chunk. blast even chunks */
221 for (ws
= 0; ws
< ws_end
; ws
+= ws_inc
)
222 for (addr
= start
; addr
< end
; addr
+= 0x400 * 2)
223 cache32_unroll32(addr
|ws
, Index_Invalidate_I
);
226 static void (* r4k_blast_icache_page
)(unsigned long addr
);
228 static void __cpuinit
r4k_blast_icache_page_setup(void)
230 unsigned long ic_lsize
= cpu_icache_line_size();
233 r4k_blast_icache_page
= (void *)cache_noop
;
234 else if (ic_lsize
== 16)
235 r4k_blast_icache_page
= blast_icache16_page
;
236 else if (ic_lsize
== 32)
237 r4k_blast_icache_page
= blast_icache32_page
;
238 else if (ic_lsize
== 64)
239 r4k_blast_icache_page
= blast_icache64_page
;
243 static void (* r4k_blast_icache_page_indexed
)(unsigned long addr
);
245 static void __cpuinit
r4k_blast_icache_page_indexed_setup(void)
247 unsigned long ic_lsize
= cpu_icache_line_size();
250 r4k_blast_icache_page_indexed
= (void *)cache_noop
;
251 else if (ic_lsize
== 16)
252 r4k_blast_icache_page_indexed
= blast_icache16_page_indexed
;
253 else if (ic_lsize
== 32) {
254 if (R4600_V1_INDEX_ICACHEOP_WAR
&& cpu_is_r4600_v1_x())
255 r4k_blast_icache_page_indexed
=
256 blast_icache32_r4600_v1_page_indexed
;
257 else if (TX49XX_ICACHE_INDEX_INV_WAR
)
258 r4k_blast_icache_page_indexed
=
259 tx49_blast_icache32_page_indexed
;
261 r4k_blast_icache_page_indexed
=
262 blast_icache32_page_indexed
;
263 } else if (ic_lsize
== 64)
264 r4k_blast_icache_page_indexed
= blast_icache64_page_indexed
;
267 static void (* r4k_blast_icache
)(void);
269 static void __cpuinit
r4k_blast_icache_setup(void)
271 unsigned long ic_lsize
= cpu_icache_line_size();
274 r4k_blast_icache
= (void *)cache_noop
;
275 else if (ic_lsize
== 16)
276 r4k_blast_icache
= blast_icache16
;
277 else if (ic_lsize
== 32) {
278 if (R4600_V1_INDEX_ICACHEOP_WAR
&& cpu_is_r4600_v1_x())
279 r4k_blast_icache
= blast_r4600_v1_icache32
;
280 else if (TX49XX_ICACHE_INDEX_INV_WAR
)
281 r4k_blast_icache
= tx49_blast_icache32
;
283 r4k_blast_icache
= blast_icache32
;
284 } else if (ic_lsize
== 64)
285 r4k_blast_icache
= blast_icache64
;
288 static void (* r4k_blast_scache_page
)(unsigned long addr
);
290 static void __cpuinit
r4k_blast_scache_page_setup(void)
292 unsigned long sc_lsize
= cpu_scache_line_size();
294 if (scache_size
== 0)
295 r4k_blast_scache_page
= (void *)cache_noop
;
296 else if (sc_lsize
== 16)
297 r4k_blast_scache_page
= blast_scache16_page
;
298 else if (sc_lsize
== 32)
299 r4k_blast_scache_page
= blast_scache32_page
;
300 else if (sc_lsize
== 64)
301 r4k_blast_scache_page
= blast_scache64_page
;
302 else if (sc_lsize
== 128)
303 r4k_blast_scache_page
= blast_scache128_page
;
306 static void (* r4k_blast_scache_page_indexed
)(unsigned long addr
);
308 static void __cpuinit
r4k_blast_scache_page_indexed_setup(void)
310 unsigned long sc_lsize
= cpu_scache_line_size();
312 if (scache_size
== 0)
313 r4k_blast_scache_page_indexed
= (void *)cache_noop
;
314 else if (sc_lsize
== 16)
315 r4k_blast_scache_page_indexed
= blast_scache16_page_indexed
;
316 else if (sc_lsize
== 32)
317 r4k_blast_scache_page_indexed
= blast_scache32_page_indexed
;
318 else if (sc_lsize
== 64)
319 r4k_blast_scache_page_indexed
= blast_scache64_page_indexed
;
320 else if (sc_lsize
== 128)
321 r4k_blast_scache_page_indexed
= blast_scache128_page_indexed
;
324 static void (* r4k_blast_scache
)(void);
326 static void __cpuinit
r4k_blast_scache_setup(void)
328 unsigned long sc_lsize
= cpu_scache_line_size();
330 if (scache_size
== 0)
331 r4k_blast_scache
= (void *)cache_noop
;
332 else if (sc_lsize
== 16)
333 r4k_blast_scache
= blast_scache16
;
334 else if (sc_lsize
== 32)
335 r4k_blast_scache
= blast_scache32
;
336 else if (sc_lsize
== 64)
337 r4k_blast_scache
= blast_scache64
;
338 else if (sc_lsize
== 128)
339 r4k_blast_scache
= blast_scache128
;
342 static inline void local_r4k___flush_cache_all(void * args
)
344 #if defined(CONFIG_CPU_LOONGSON2)
351 switch (current_cpu_type()) {
363 static void r4k___flush_cache_all(void)
365 r4k_on_each_cpu(local_r4k___flush_cache_all
, NULL
);
368 static inline int has_valid_asid(const struct mm_struct
*mm
)
370 #if defined(CONFIG_MIPS_MT_SMP) || defined(CONFIG_MIPS_MT_SMTC)
373 for_each_online_cpu(i
)
374 if (cpu_context(i
, mm
))
379 return cpu_context(smp_processor_id(), mm
);
383 static void r4k__flush_cache_vmap(void)
388 static void r4k__flush_cache_vunmap(void)
393 static inline void local_r4k_flush_cache_range(void * args
)
395 struct vm_area_struct
*vma
= args
;
396 int exec
= vma
->vm_flags
& VM_EXEC
;
398 if (!(has_valid_asid(vma
->vm_mm
)))
406 static void r4k_flush_cache_range(struct vm_area_struct
*vma
,
407 unsigned long start
, unsigned long end
)
409 int exec
= vma
->vm_flags
& VM_EXEC
;
411 if (cpu_has_dc_aliases
|| (exec
&& !cpu_has_ic_fills_f_dc
))
412 r4k_on_each_cpu(local_r4k_flush_cache_range
, vma
);
415 static inline void local_r4k_flush_cache_mm(void * args
)
417 struct mm_struct
*mm
= args
;
419 if (!has_valid_asid(mm
))
423 * Kludge alert. For obscure reasons R4000SC and R4400SC go nuts if we
424 * only flush the primary caches but R10000 and R12000 behave sane ...
425 * R4000SC and R4400SC indexed S-cache ops also invalidate primary
426 * caches, so we can bail out early.
428 if (current_cpu_type() == CPU_R4000SC
||
429 current_cpu_type() == CPU_R4000MC
||
430 current_cpu_type() == CPU_R4400SC
||
431 current_cpu_type() == CPU_R4400MC
) {
439 static void r4k_flush_cache_mm(struct mm_struct
*mm
)
441 if (!cpu_has_dc_aliases
)
444 r4k_on_each_cpu(local_r4k_flush_cache_mm
, mm
);
447 struct flush_cache_page_args
{
448 struct vm_area_struct
*vma
;
453 static inline void local_r4k_flush_cache_page(void *args
)
455 struct flush_cache_page_args
*fcp_args
= args
;
456 struct vm_area_struct
*vma
= fcp_args
->vma
;
457 unsigned long addr
= fcp_args
->addr
;
458 struct page
*page
= pfn_to_page(fcp_args
->pfn
);
459 int exec
= vma
->vm_flags
& VM_EXEC
;
460 struct mm_struct
*mm
= vma
->vm_mm
;
461 int map_coherent
= 0;
469 * If ownes no valid ASID yet, cannot possibly have gotten
470 * this page into the cache.
472 if (!has_valid_asid(mm
))
476 pgdp
= pgd_offset(mm
, addr
);
477 pudp
= pud_offset(pgdp
, addr
);
478 pmdp
= pmd_offset(pudp
, addr
);
479 ptep
= pte_offset(pmdp
, addr
);
482 * If the page isn't marked valid, the page cannot possibly be
485 if (!(pte_present(*ptep
)))
488 if ((mm
== current
->active_mm
) && (pte_val(*ptep
) & _PAGE_VALID
))
492 * Use kmap_coherent or kmap_atomic to do flushes for
493 * another ASID than the current one.
495 map_coherent
= (cpu_has_dc_aliases
&&
496 page_mapped(page
) && !Page_dcache_dirty(page
));
498 vaddr
= kmap_coherent(page
, addr
);
500 vaddr
= kmap_atomic(page
);
501 addr
= (unsigned long)vaddr
;
504 if (cpu_has_dc_aliases
|| (exec
&& !cpu_has_ic_fills_f_dc
)) {
505 r4k_blast_dcache_page(addr
);
506 if (exec
&& !cpu_icache_snoops_remote_store
)
507 r4k_blast_scache_page(addr
);
510 if (vaddr
&& cpu_has_vtag_icache
&& mm
== current
->active_mm
) {
511 int cpu
= smp_processor_id();
513 if (cpu_context(cpu
, mm
) != 0)
514 drop_mmu_context(mm
, cpu
);
516 r4k_blast_icache_page(addr
);
523 kunmap_atomic(vaddr
);
527 static void r4k_flush_cache_page(struct vm_area_struct
*vma
,
528 unsigned long addr
, unsigned long pfn
)
530 struct flush_cache_page_args args
;
536 r4k_on_each_cpu(local_r4k_flush_cache_page
, &args
);
539 static inline void local_r4k_flush_data_cache_page(void * addr
)
541 r4k_blast_dcache_page((unsigned long) addr
);
544 static void r4k_flush_data_cache_page(unsigned long addr
)
547 local_r4k_flush_data_cache_page((void *)addr
);
549 r4k_on_each_cpu(local_r4k_flush_data_cache_page
, (void *) addr
);
552 struct flush_icache_range_args
{
557 static inline void local_r4k_flush_icache_range(unsigned long start
, unsigned long end
)
559 if (!cpu_has_ic_fills_f_dc
) {
560 if (end
- start
>= dcache_size
) {
563 R4600_HIT_CACHEOP_WAR_IMPL
;
564 protected_blast_dcache_range(start
, end
);
568 if (end
- start
> icache_size
)
571 protected_blast_icache_range(start
, end
);
574 static inline void local_r4k_flush_icache_range_ipi(void *args
)
576 struct flush_icache_range_args
*fir_args
= args
;
577 unsigned long start
= fir_args
->start
;
578 unsigned long end
= fir_args
->end
;
580 local_r4k_flush_icache_range(start
, end
);
583 static void r4k_flush_icache_range(unsigned long start
, unsigned long end
)
585 struct flush_icache_range_args args
;
590 r4k_on_each_cpu(local_r4k_flush_icache_range_ipi
, &args
);
591 instruction_hazard();
594 #ifdef CONFIG_DMA_NONCOHERENT
596 static void r4k_dma_cache_wback_inv(unsigned long addr
, unsigned long size
)
598 /* Catch bad driver code */
601 if (cpu_has_inclusive_pcaches
) {
602 if (size
>= scache_size
)
605 blast_scache_range(addr
, addr
+ size
);
611 * Either no secondary cache or the available caches don't have the
612 * subset property so we have to flush the primary caches
615 if (cpu_has_safe_index_cacheops
&& size
>= dcache_size
) {
618 R4600_HIT_CACHEOP_WAR_IMPL
;
619 blast_dcache_range(addr
, addr
+ size
);
622 bc_wback_inv(addr
, size
);
626 static void r4k_dma_cache_inv(unsigned long addr
, unsigned long size
)
628 /* Catch bad driver code */
631 if (cpu_has_inclusive_pcaches
) {
632 if (size
>= scache_size
)
636 * There is no clearly documented alignment requirement
637 * for the cache instruction on MIPS processors and
638 * some processors, among them the RM5200 and RM7000
639 * QED processors will throw an address error for cache
640 * hit ops with insufficient alignment. Solved by
641 * aligning the address to cache line size.
643 blast_inv_scache_range(addr
, addr
+ size
);
649 if (cpu_has_safe_index_cacheops
&& size
>= dcache_size
) {
652 R4600_HIT_CACHEOP_WAR_IMPL
;
653 blast_inv_dcache_range(addr
, addr
+ size
);
659 #endif /* CONFIG_DMA_NONCOHERENT */
662 * While we're protected against bad userland addresses we don't care
663 * very much about what happens in that case. Usually a segmentation
664 * fault will dump the process later on anyway ...
666 static void local_r4k_flush_cache_sigtramp(void * arg
)
668 unsigned long ic_lsize
= cpu_icache_line_size();
669 unsigned long dc_lsize
= cpu_dcache_line_size();
670 unsigned long sc_lsize
= cpu_scache_line_size();
671 unsigned long addr
= (unsigned long) arg
;
673 R4600_HIT_CACHEOP_WAR_IMPL
;
675 protected_writeback_dcache_line(addr
& ~(dc_lsize
- 1));
676 if (!cpu_icache_snoops_remote_store
&& scache_size
)
677 protected_writeback_scache_line(addr
& ~(sc_lsize
- 1));
679 protected_flush_icache_line(addr
& ~(ic_lsize
- 1));
680 if (MIPS4K_ICACHE_REFILL_WAR
) {
681 __asm__
__volatile__ (
696 : "i" (Hit_Invalidate_I
));
698 if (MIPS_CACHE_SYNC_WAR
)
699 __asm__
__volatile__ ("sync");
702 static void r4k_flush_cache_sigtramp(unsigned long addr
)
704 r4k_on_each_cpu(local_r4k_flush_cache_sigtramp
, (void *) addr
);
707 static void r4k_flush_icache_all(void)
709 if (cpu_has_vtag_icache
)
713 struct flush_kernel_vmap_range_args
{
718 static inline void local_r4k_flush_kernel_vmap_range(void *args
)
720 struct flush_kernel_vmap_range_args
*vmra
= args
;
721 unsigned long vaddr
= vmra
->vaddr
;
722 int size
= vmra
->size
;
725 * Aliases only affect the primary caches so don't bother with
726 * S-caches or T-caches.
728 if (cpu_has_safe_index_cacheops
&& size
>= dcache_size
)
731 R4600_HIT_CACHEOP_WAR_IMPL
;
732 blast_dcache_range(vaddr
, vaddr
+ size
);
736 static void r4k_flush_kernel_vmap_range(unsigned long vaddr
, int size
)
738 struct flush_kernel_vmap_range_args args
;
740 args
.vaddr
= (unsigned long) vaddr
;
743 r4k_on_each_cpu(local_r4k_flush_kernel_vmap_range
, &args
);
746 static inline void rm7k_erratum31(void)
748 const unsigned long ic_lsize
= 32;
751 /* RM7000 erratum #31. The icache is screwed at startup. */
755 for (addr
= INDEX_BASE
; addr
<= INDEX_BASE
+ 4096; addr
+= ic_lsize
) {
756 __asm__
__volatile__ (
760 "cache\t%1, 0(%0)\n\t"
761 "cache\t%1, 0x1000(%0)\n\t"
762 "cache\t%1, 0x2000(%0)\n\t"
763 "cache\t%1, 0x3000(%0)\n\t"
764 "cache\t%2, 0(%0)\n\t"
765 "cache\t%2, 0x1000(%0)\n\t"
766 "cache\t%2, 0x2000(%0)\n\t"
767 "cache\t%2, 0x3000(%0)\n\t"
768 "cache\t%1, 0(%0)\n\t"
769 "cache\t%1, 0x1000(%0)\n\t"
770 "cache\t%1, 0x2000(%0)\n\t"
771 "cache\t%1, 0x3000(%0)\n\t"
774 : "r" (addr
), "i" (Index_Store_Tag_I
), "i" (Fill
));
778 static inline void alias_74k_erratum(struct cpuinfo_mips
*c
)
781 * Early versions of the 74K do not update the cache tags on a
782 * vtag miss/ptag hit which can occur in the case of KSEG0/KUSEG
783 * aliases. In this case it is better to treat the cache as always
786 if ((c
->processor_id
& 0xff) <= PRID_REV_ENCODE_332(2, 4, 0))
787 c
->dcache
.flags
|= MIPS_CACHE_VTAG
;
788 if ((c
->processor_id
& 0xff) == PRID_REV_ENCODE_332(2, 4, 0))
789 write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND
);
790 if (((c
->processor_id
& 0xff00) == PRID_IMP_1074K
) &&
791 ((c
->processor_id
& 0xff) <= PRID_REV_ENCODE_332(1, 1, 0))) {
792 c
->dcache
.flags
|= MIPS_CACHE_VTAG
;
793 write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND
);
797 static char *way_string
[] __cpuinitdata
= { NULL
, "direct mapped", "2-way",
798 "3-way", "4-way", "5-way", "6-way", "7-way", "8-way"
801 static void __cpuinit
probe_pcache(void)
803 struct cpuinfo_mips
*c
= ¤t_cpu_data
;
804 unsigned int config
= read_c0_config();
805 unsigned int prid
= read_c0_prid();
806 unsigned long config1
;
809 switch (c
->cputype
) {
810 case CPU_R4600
: /* QED style two way caches? */
814 icache_size
= 1 << (12 + ((config
& CONF_IC
) >> 9));
815 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
817 c
->icache
.waybit
= __ffs(icache_size
/2);
819 dcache_size
= 1 << (12 + ((config
& CONF_DC
) >> 6));
820 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
822 c
->dcache
.waybit
= __ffs(dcache_size
/2);
824 c
->options
|= MIPS_CPU_CACHE_CDEX_P
;
829 icache_size
= 1 << (12 + ((config
& CONF_IC
) >> 9));
830 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
834 dcache_size
= 1 << (12 + ((config
& CONF_DC
) >> 6));
835 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
837 c
->dcache
.waybit
= 0;
839 c
->options
|= MIPS_CPU_CACHE_CDEX_P
| MIPS_CPU_PREFETCH
;
843 icache_size
= 1 << (12 + ((config
& CONF_IC
) >> 9));
844 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
848 dcache_size
= 1 << (12 + ((config
& CONF_DC
) >> 6));
849 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
851 c
->dcache
.waybit
= 0;
853 c
->options
|= MIPS_CPU_CACHE_CDEX_P
;
854 c
->options
|= MIPS_CPU_PREFETCH
;
864 icache_size
= 1 << (12 + ((config
& CONF_IC
) >> 9));
865 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
867 c
->icache
.waybit
= 0; /* doesn't matter */
869 dcache_size
= 1 << (12 + ((config
& CONF_DC
) >> 6));
870 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
872 c
->dcache
.waybit
= 0; /* does not matter */
874 c
->options
|= MIPS_CPU_CACHE_CDEX_P
;
880 icache_size
= 1 << (12 + ((config
& R10K_CONF_IC
) >> 29));
881 c
->icache
.linesz
= 64;
883 c
->icache
.waybit
= 0;
885 dcache_size
= 1 << (12 + ((config
& R10K_CONF_DC
) >> 26));
886 c
->dcache
.linesz
= 32;
888 c
->dcache
.waybit
= 0;
890 c
->options
|= MIPS_CPU_PREFETCH
;
894 write_c0_config(config
& ~VR41_CONF_P4K
);
896 /* Workaround for cache instruction bug of VR4131 */
897 if (c
->processor_id
== 0x0c80U
|| c
->processor_id
== 0x0c81U
||
898 c
->processor_id
== 0x0c82U
) {
899 config
|= 0x00400000U
;
900 if (c
->processor_id
== 0x0c80U
)
901 config
|= VR41_CONF_BP
;
902 write_c0_config(config
);
904 c
->options
|= MIPS_CPU_CACHE_CDEX_P
;
906 icache_size
= 1 << (10 + ((config
& CONF_IC
) >> 9));
907 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
909 c
->icache
.waybit
= __ffs(icache_size
/2);
911 dcache_size
= 1 << (10 + ((config
& CONF_DC
) >> 6));
912 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
914 c
->dcache
.waybit
= __ffs(dcache_size
/2);
923 icache_size
= 1 << (10 + ((config
& CONF_IC
) >> 9));
924 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
926 c
->icache
.waybit
= 0; /* doesn't matter */
928 dcache_size
= 1 << (10 + ((config
& CONF_DC
) >> 6));
929 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
931 c
->dcache
.waybit
= 0; /* does not matter */
933 c
->options
|= MIPS_CPU_CACHE_CDEX_P
;
939 icache_size
= 1 << (12 + ((config
& CONF_IC
) >> 9));
940 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
942 c
->icache
.waybit
= __ffs(icache_size
/ c
->icache
.ways
);
944 dcache_size
= 1 << (12 + ((config
& CONF_DC
) >> 6));
945 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
947 c
->dcache
.waybit
= __ffs(dcache_size
/ c
->dcache
.ways
);
949 c
->options
|= MIPS_CPU_CACHE_CDEX_P
;
950 c
->options
|= MIPS_CPU_PREFETCH
;
954 icache_size
= 1 << (12 + ((config
& CONF_IC
) >> 9));
955 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
960 c
->icache
.waybit
= 0;
962 dcache_size
= 1 << (12 + ((config
& CONF_DC
) >> 6));
963 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
968 c
->dcache
.waybit
= 0;
972 if (!(config
& MIPS_CONF_M
))
973 panic("Don't know how to probe P-caches on this cpu.");
976 * So we seem to be a MIPS32 or MIPS64 CPU
977 * So let's probe the I-cache ...
979 config1
= read_c0_config1();
981 if ((lsize
= ((config1
>> 19) & 7)))
982 c
->icache
.linesz
= 2 << lsize
;
984 c
->icache
.linesz
= lsize
;
985 c
->icache
.sets
= 32 << (((config1
>> 22) + 1) & 7);
986 c
->icache
.ways
= 1 + ((config1
>> 16) & 7);
988 icache_size
= c
->icache
.sets
*
991 c
->icache
.waybit
= __ffs(icache_size
/c
->icache
.ways
);
993 if (config
& 0x8) /* VI bit */
994 c
->icache
.flags
|= MIPS_CACHE_VTAG
;
997 * Now probe the MIPS32 / MIPS64 data cache.
1001 if ((lsize
= ((config1
>> 10) & 7)))
1002 c
->dcache
.linesz
= 2 << lsize
;
1004 c
->dcache
.linesz
= lsize
;
1005 c
->dcache
.sets
= 32 << (((config1
>> 13) + 1) & 7);
1006 c
->dcache
.ways
= 1 + ((config1
>> 7) & 7);
1008 dcache_size
= c
->dcache
.sets
*
1011 c
->dcache
.waybit
= __ffs(dcache_size
/c
->dcache
.ways
);
1013 c
->options
|= MIPS_CPU_PREFETCH
;
1018 * Processor configuration sanity check for the R4000SC erratum
1019 * #5. With page sizes larger than 32kB there is no possibility
1020 * to get a VCE exception anymore so we don't care about this
1021 * misconfiguration. The case is rather theoretical anyway;
1022 * presumably no vendor is shipping his hardware in the "bad"
1025 if ((prid
& 0xff00) == PRID_IMP_R4000
&& (prid
& 0xff) < 0x40 &&
1026 !(config
& CONF_SC
) && c
->icache
.linesz
!= 16 &&
1027 PAGE_SIZE
<= 0x8000)
1028 panic("Improper R4000SC processor configuration detected");
1030 /* compute a couple of other cache variables */
1031 c
->icache
.waysize
= icache_size
/ c
->icache
.ways
;
1032 c
->dcache
.waysize
= dcache_size
/ c
->dcache
.ways
;
1034 c
->icache
.sets
= c
->icache
.linesz
?
1035 icache_size
/ (c
->icache
.linesz
* c
->icache
.ways
) : 0;
1036 c
->dcache
.sets
= c
->dcache
.linesz
?
1037 dcache_size
/ (c
->dcache
.linesz
* c
->dcache
.ways
) : 0;
1040 * R10000 and R12000 P-caches are odd in a positive way. They're 32kB
1041 * 2-way virtually indexed so normally would suffer from aliases. So
1042 * normally they'd suffer from aliases but magic in the hardware deals
1043 * with that for us so we don't need to take care ourselves.
1045 switch (c
->cputype
) {
1051 c
->dcache
.flags
|= MIPS_CACHE_PINDEX
;
1065 if (c
->cputype
== CPU_74K
)
1066 alias_74k_erratum(c
);
1067 if ((read_c0_config7() & (1 << 16))) {
1068 /* effectively physically indexed dcache,
1069 thus no virtual aliases. */
1070 c
->dcache
.flags
|= MIPS_CACHE_PINDEX
;
1074 if (c
->dcache
.waysize
> PAGE_SIZE
)
1075 c
->dcache
.flags
|= MIPS_CACHE_ALIASES
;
1078 switch (c
->cputype
) {
1081 * Some older 20Kc chips doesn't have the 'VI' bit in
1082 * the config register.
1084 c
->icache
.flags
|= MIPS_CACHE_VTAG
;
1088 c
->icache
.flags
|= MIPS_CACHE_IC_F_DC
;
1092 #ifdef CONFIG_CPU_LOONGSON2
1094 * LOONGSON2 has 4 way icache, but when using indexed cache op,
1095 * one op will act on all 4 ways
1100 printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
1102 c
->icache
.flags
& MIPS_CACHE_VTAG
? "VIVT" : "VIPT",
1103 way_string
[c
->icache
.ways
], c
->icache
.linesz
);
1105 printk("Primary data cache %ldkB, %s, %s, %s, linesize %d bytes\n",
1106 dcache_size
>> 10, way_string
[c
->dcache
.ways
],
1107 (c
->dcache
.flags
& MIPS_CACHE_PINDEX
) ? "PIPT" : "VIPT",
1108 (c
->dcache
.flags
& MIPS_CACHE_ALIASES
) ?
1109 "cache aliases" : "no aliases",
1114 * If you even _breathe_ on this function, look at the gcc output and make sure
1115 * it does not pop things on and off the stack for the cache sizing loop that
1116 * executes in KSEG1 space or else you will crash and burn badly. You have
1119 static int __cpuinit
probe_scache(void)
1121 unsigned long flags
, addr
, begin
, end
, pow2
;
1122 unsigned int config
= read_c0_config();
1123 struct cpuinfo_mips
*c
= ¤t_cpu_data
;
1125 if (config
& CONF_SC
)
1128 begin
= (unsigned long) &_stext
;
1129 begin
&= ~((4 * 1024 * 1024) - 1);
1130 end
= begin
+ (4 * 1024 * 1024);
1133 * This is such a bitch, you'd think they would make it easy to do
1134 * this. Away you daemons of stupidity!
1136 local_irq_save(flags
);
1138 /* Fill each size-multiple cache line with a valid tag. */
1140 for (addr
= begin
; addr
< end
; addr
= (begin
+ pow2
)) {
1141 unsigned long *p
= (unsigned long *) addr
;
1142 __asm__
__volatile__("nop" : : "r" (*p
)); /* whee... */
1146 /* Load first line with zero (therefore invalid) tag. */
1149 __asm__
__volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
1150 cache_op(Index_Store_Tag_I
, begin
);
1151 cache_op(Index_Store_Tag_D
, begin
);
1152 cache_op(Index_Store_Tag_SD
, begin
);
1154 /* Now search for the wrap around point. */
1155 pow2
= (128 * 1024);
1156 for (addr
= begin
+ (128 * 1024); addr
< end
; addr
= begin
+ pow2
) {
1157 cache_op(Index_Load_Tag_SD
, addr
);
1158 __asm__
__volatile__("nop; nop; nop; nop;"); /* hazard... */
1159 if (!read_c0_taglo())
1163 local_irq_restore(flags
);
1167 c
->scache
.linesz
= 16 << ((config
& R4K_CONF_SB
) >> 22);
1169 c
->dcache
.waybit
= 0; /* does not matter */
1174 #if defined(CONFIG_CPU_LOONGSON2)
1175 static void __init
loongson2_sc_init(void)
1177 struct cpuinfo_mips
*c
= ¤t_cpu_data
;
1179 scache_size
= 512*1024;
1180 c
->scache
.linesz
= 32;
1182 c
->scache
.waybit
= 0;
1183 c
->scache
.waysize
= scache_size
/ (c
->scache
.ways
);
1184 c
->scache
.sets
= scache_size
/ (c
->scache
.linesz
* c
->scache
.ways
);
1185 pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1186 scache_size
>> 10, way_string
[c
->scache
.ways
], c
->scache
.linesz
);
1188 c
->options
|= MIPS_CPU_INCLUSIVE_CACHES
;
1192 extern int r5k_sc_init(void);
1193 extern int rm7k_sc_init(void);
1194 extern int mips_sc_init(void);
1196 static void __cpuinit
setup_scache(void)
1198 struct cpuinfo_mips
*c
= ¤t_cpu_data
;
1199 unsigned int config
= read_c0_config();
1203 * Do the probing thing on R4000SC and R4400SC processors. Other
1204 * processors don't have a S-cache that would be relevant to the
1205 * Linux memory management.
1207 switch (c
->cputype
) {
1212 sc_present
= run_uncached(probe_scache
);
1214 c
->options
|= MIPS_CPU_CACHE_CDEX_S
;
1220 scache_size
= 0x80000 << ((config
& R10K_CONF_SS
) >> 16);
1221 c
->scache
.linesz
= 64 << ((config
>> 13) & 1);
1223 c
->scache
.waybit
= 0;
1229 #ifdef CONFIG_R5000_CPU_SCACHE
1235 #ifdef CONFIG_RM7000_CPU_SCACHE
1240 #if defined(CONFIG_CPU_LOONGSON2)
1242 loongson2_sc_init();
1246 /* don't need to worry about L2, fully coherent */
1250 if (c
->isa_level
== MIPS_CPU_ISA_M32R1
||
1251 c
->isa_level
== MIPS_CPU_ISA_M32R2
||
1252 c
->isa_level
== MIPS_CPU_ISA_M64R1
||
1253 c
->isa_level
== MIPS_CPU_ISA_M64R2
) {
1254 #ifdef CONFIG_MIPS_CPU_SCACHE
1255 if (mips_sc_init ()) {
1256 scache_size
= c
->scache
.ways
* c
->scache
.sets
* c
->scache
.linesz
;
1257 printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n",
1259 way_string
[c
->scache
.ways
], c
->scache
.linesz
);
1262 if (!(c
->scache
.flags
& MIPS_CACHE_NOT_PRESENT
))
1263 panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
1273 /* compute a couple of other cache variables */
1274 c
->scache
.waysize
= scache_size
/ c
->scache
.ways
;
1276 c
->scache
.sets
= scache_size
/ (c
->scache
.linesz
* c
->scache
.ways
);
1278 printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1279 scache_size
>> 10, way_string
[c
->scache
.ways
], c
->scache
.linesz
);
1281 c
->options
|= MIPS_CPU_INCLUSIVE_CACHES
;
1284 void au1x00_fixup_config_od(void)
1287 * c0_config.od (bit 19) was write only (and read as 0)
1288 * on the early revisions of Alchemy SOCs. It disables the bus
1289 * transaction overlapping and needs to be set to fix various errata.
1291 switch (read_c0_prid()) {
1292 case 0x00030100: /* Au1000 DA */
1293 case 0x00030201: /* Au1000 HA */
1294 case 0x00030202: /* Au1000 HB */
1295 case 0x01030200: /* Au1500 AB */
1297 * Au1100 errata actually keeps silence about this bit, so we set it
1298 * just in case for those revisions that require it to be set according
1299 * to the (now gone) cpu table.
1301 case 0x02030200: /* Au1100 AB */
1302 case 0x02030201: /* Au1100 BA */
1303 case 0x02030202: /* Au1100 BC */
1304 set_c0_config(1 << 19);
1309 /* CP0 hazard avoidance. */
1310 #define NXP_BARRIER() \
1311 __asm__ __volatile__( \
1312 ".set noreorder\n\t" \
1313 "nop; nop; nop; nop; nop; nop;\n\t" \
1316 static void nxp_pr4450_fixup_config(void)
1318 unsigned long config0
;
1320 config0
= read_c0_config();
1322 /* clear all three cache coherency fields */
1323 config0
&= ~(0x7 | (7 << 25) | (7 << 28));
1324 config0
|= (((_page_cachable_default
>> _CACHE_SHIFT
) << 0) |
1325 ((_page_cachable_default
>> _CACHE_SHIFT
) << 25) |
1326 ((_page_cachable_default
>> _CACHE_SHIFT
) << 28));
1327 write_c0_config(config0
);
1331 static int __cpuinitdata cca
= -1;
1333 static int __init
cca_setup(char *str
)
1335 get_option(&str
, &cca
);
1340 early_param("cca", cca_setup
);
1342 static void __cpuinit
coherency_setup(void)
1344 if (cca
< 0 || cca
> 7)
1345 cca
= read_c0_config() & CONF_CM_CMASK
;
1346 _page_cachable_default
= cca
<< _CACHE_SHIFT
;
1348 pr_debug("Using cache attribute %d\n", cca
);
1349 change_c0_config(CONF_CM_CMASK
, cca
);
1352 * c0_status.cu=0 specifies that updates by the sc instruction use
1353 * the coherency mode specified by the TLB; 1 means cachable
1354 * coherent update on write will be used. Not all processors have
1355 * this bit and; some wire it to zero, others like Toshiba had the
1356 * silly idea of putting something else there ...
1358 switch (current_cpu_type()) {
1365 clear_c0_config(CONF_CU
);
1368 * We need to catch the early Alchemy SOCs with
1369 * the write-only co_config.od bit and set it back to one on:
1370 * Au1000 rev DA, HA, HB; Au1100 AB, BA, BC, Au1500 AB
1373 au1x00_fixup_config_od();
1376 case PRID_IMP_PR4450
:
1377 nxp_pr4450_fixup_config();
1382 #if defined(CONFIG_DMA_NONCOHERENT)
1384 static int __cpuinitdata coherentio
;
1386 static int __init
setcoherentio(char *str
)
1393 early_param("coherentio", setcoherentio
);
1396 static void __cpuinit
r4k_cache_error_setup(void)
1398 extern char __weak except_vec2_generic
;
1399 extern char __weak except_vec2_sb1
;
1400 struct cpuinfo_mips
*c
= ¤t_cpu_data
;
1402 switch (c
->cputype
) {
1405 set_uncached_handler(0x100, &except_vec2_sb1
, 0x80);
1409 set_uncached_handler(0x100, &except_vec2_generic
, 0x80);
1414 void __cpuinit
r4k_cache_init(void)
1416 extern void build_clear_page(void);
1417 extern void build_copy_page(void);
1418 struct cpuinfo_mips
*c
= ¤t_cpu_data
;
1423 r4k_blast_dcache_page_setup();
1424 r4k_blast_dcache_page_indexed_setup();
1425 r4k_blast_dcache_setup();
1426 r4k_blast_icache_page_setup();
1427 r4k_blast_icache_page_indexed_setup();
1428 r4k_blast_icache_setup();
1429 r4k_blast_scache_page_setup();
1430 r4k_blast_scache_page_indexed_setup();
1431 r4k_blast_scache_setup();
1434 * Some MIPS32 and MIPS64 processors have physically indexed caches.
1435 * This code supports virtually indexed processors and will be
1436 * unnecessarily inefficient on physically indexed processors.
1438 if (c
->dcache
.linesz
)
1439 shm_align_mask
= max_t( unsigned long,
1440 c
->dcache
.sets
* c
->dcache
.linesz
- 1,
1443 shm_align_mask
= PAGE_SIZE
-1;
1445 __flush_cache_vmap
= r4k__flush_cache_vmap
;
1446 __flush_cache_vunmap
= r4k__flush_cache_vunmap
;
1448 flush_cache_all
= cache_noop
;
1449 __flush_cache_all
= r4k___flush_cache_all
;
1450 flush_cache_mm
= r4k_flush_cache_mm
;
1451 flush_cache_page
= r4k_flush_cache_page
;
1452 flush_cache_range
= r4k_flush_cache_range
;
1454 __flush_kernel_vmap_range
= r4k_flush_kernel_vmap_range
;
1456 flush_cache_sigtramp
= r4k_flush_cache_sigtramp
;
1457 flush_icache_all
= r4k_flush_icache_all
;
1458 local_flush_data_cache_page
= local_r4k_flush_data_cache_page
;
1459 flush_data_cache_page
= r4k_flush_data_cache_page
;
1460 flush_icache_range
= r4k_flush_icache_range
;
1461 local_flush_icache_range
= local_r4k_flush_icache_range
;
1463 #if defined(CONFIG_DMA_NONCOHERENT)
1465 _dma_cache_wback_inv
= (void *)cache_noop
;
1466 _dma_cache_wback
= (void *)cache_noop
;
1467 _dma_cache_inv
= (void *)cache_noop
;
1469 _dma_cache_wback_inv
= r4k_dma_cache_wback_inv
;
1470 _dma_cache_wback
= r4k_dma_cache_wback_inv
;
1471 _dma_cache_inv
= r4k_dma_cache_inv
;
1477 #if !defined(CONFIG_MIPS_CMP)
1478 local_r4k___flush_cache_all(NULL
);
1481 board_cache_error_setup
= r4k_cache_error_setup
;