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 (dm@engr.sgi.com)
7 * Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Ralf Baechle (ralf@gnu.org)
8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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>
17 #include <linux/bitops.h>
19 #include <asm/bcache.h>
20 #include <asm/bootinfo.h>
21 #include <asm/cache.h>
22 #include <asm/cacheops.h>
24 #include <asm/cpu-features.h>
27 #include <asm/pgtable.h>
28 #include <asm/r4kcache.h>
29 #include <asm/sections.h>
30 #include <asm/system.h>
31 #include <asm/mmu_context.h>
33 #include <asm/cacheflush.h> /* for run_uncached() */
37 * Special Variant of smp_call_function for use by cache functions:
40 * o collapses to normal function call on UP kernels
41 * o collapses to normal function call on systems with a single shared
44 static inline void r4k_on_each_cpu(void (*func
) (void *info
), void *info
,
49 #if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC)
50 smp_call_function(func
, info
, retry
, wait
);
59 static unsigned long icache_size __read_mostly
;
60 static unsigned long dcache_size __read_mostly
;
61 static unsigned long scache_size __read_mostly
;
64 * Dummy cache handling routines for machines without boardcaches
66 static void cache_noop(void) {}
68 static struct bcache_ops no_sc_ops
= {
69 .bc_enable
= (void *)cache_noop
,
70 .bc_disable
= (void *)cache_noop
,
71 .bc_wback_inv
= (void *)cache_noop
,
72 .bc_inv
= (void *)cache_noop
75 struct bcache_ops
*bcops
= &no_sc_ops
;
77 #define cpu_is_r4600_v1_x() ((read_c0_prid() & 0xfffffff0) == 0x00002010)
78 #define cpu_is_r4600_v2_x() ((read_c0_prid() & 0xfffffff0) == 0x00002020)
80 #define R4600_HIT_CACHEOP_WAR_IMPL \
82 if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x()) \
83 *(volatile unsigned long *)CKSEG1; \
84 if (R4600_V1_HIT_CACHEOP_WAR) \
85 __asm__ __volatile__("nop;nop;nop;nop"); \
88 static void (*r4k_blast_dcache_page
)(unsigned long addr
);
90 static inline void r4k_blast_dcache_page_dc32(unsigned long addr
)
92 R4600_HIT_CACHEOP_WAR_IMPL
;
93 blast_dcache32_page(addr
);
96 static void __init
r4k_blast_dcache_page_setup(void)
98 unsigned long dc_lsize
= cpu_dcache_line_size();
101 r4k_blast_dcache_page
= (void *)cache_noop
;
102 else if (dc_lsize
== 16)
103 r4k_blast_dcache_page
= blast_dcache16_page
;
104 else if (dc_lsize
== 32)
105 r4k_blast_dcache_page
= r4k_blast_dcache_page_dc32
;
108 static void (* r4k_blast_dcache_page_indexed
)(unsigned long addr
);
110 static void __init
r4k_blast_dcache_page_indexed_setup(void)
112 unsigned long dc_lsize
= cpu_dcache_line_size();
115 r4k_blast_dcache_page_indexed
= (void *)cache_noop
;
116 else if (dc_lsize
== 16)
117 r4k_blast_dcache_page_indexed
= blast_dcache16_page_indexed
;
118 else if (dc_lsize
== 32)
119 r4k_blast_dcache_page_indexed
= blast_dcache32_page_indexed
;
122 static void (* r4k_blast_dcache
)(void);
124 static void __init
r4k_blast_dcache_setup(void)
126 unsigned long dc_lsize
= cpu_dcache_line_size();
129 r4k_blast_dcache
= (void *)cache_noop
;
130 else if (dc_lsize
== 16)
131 r4k_blast_dcache
= blast_dcache16
;
132 else if (dc_lsize
== 32)
133 r4k_blast_dcache
= blast_dcache32
;
136 /* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
137 #define JUMP_TO_ALIGN(order) \
138 __asm__ __volatile__( \
140 ".align\t" #order "\n\t" \
143 #define CACHE32_UNROLL32_ALIGN JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
144 #define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
146 static inline void blast_r4600_v1_icache32(void)
150 local_irq_save(flags
);
152 local_irq_restore(flags
);
155 static inline void tx49_blast_icache32(void)
157 unsigned long start
= INDEX_BASE
;
158 unsigned long end
= start
+ current_cpu_data
.icache
.waysize
;
159 unsigned long ws_inc
= 1UL << current_cpu_data
.icache
.waybit
;
160 unsigned long ws_end
= current_cpu_data
.icache
.ways
<<
161 current_cpu_data
.icache
.waybit
;
162 unsigned long ws
, addr
;
164 CACHE32_UNROLL32_ALIGN2
;
165 /* I'm in even chunk. blast odd chunks */
166 for (ws
= 0; ws
< ws_end
; ws
+= ws_inc
)
167 for (addr
= start
+ 0x400; addr
< end
; addr
+= 0x400 * 2)
168 cache32_unroll32(addr
|ws
, Index_Invalidate_I
);
169 CACHE32_UNROLL32_ALIGN
;
170 /* I'm in odd chunk. blast even chunks */
171 for (ws
= 0; ws
< ws_end
; ws
+= ws_inc
)
172 for (addr
= start
; addr
< end
; addr
+= 0x400 * 2)
173 cache32_unroll32(addr
|ws
, Index_Invalidate_I
);
176 static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page
)
180 local_irq_save(flags
);
181 blast_icache32_page_indexed(page
);
182 local_irq_restore(flags
);
185 static inline void tx49_blast_icache32_page_indexed(unsigned long page
)
187 unsigned long indexmask
= current_cpu_data
.icache
.waysize
- 1;
188 unsigned long start
= INDEX_BASE
+ (page
& indexmask
);
189 unsigned long end
= start
+ PAGE_SIZE
;
190 unsigned long ws_inc
= 1UL << current_cpu_data
.icache
.waybit
;
191 unsigned long ws_end
= current_cpu_data
.icache
.ways
<<
192 current_cpu_data
.icache
.waybit
;
193 unsigned long ws
, addr
;
195 CACHE32_UNROLL32_ALIGN2
;
196 /* I'm in even chunk. blast odd chunks */
197 for (ws
= 0; ws
< ws_end
; ws
+= ws_inc
)
198 for (addr
= start
+ 0x400; addr
< end
; addr
+= 0x400 * 2)
199 cache32_unroll32(addr
|ws
, Index_Invalidate_I
);
200 CACHE32_UNROLL32_ALIGN
;
201 /* I'm in odd chunk. blast even chunks */
202 for (ws
= 0; ws
< ws_end
; ws
+= ws_inc
)
203 for (addr
= start
; addr
< end
; addr
+= 0x400 * 2)
204 cache32_unroll32(addr
|ws
, Index_Invalidate_I
);
207 static void (* r4k_blast_icache_page
)(unsigned long addr
);
209 static void __init
r4k_blast_icache_page_setup(void)
211 unsigned long ic_lsize
= cpu_icache_line_size();
214 r4k_blast_icache_page
= (void *)cache_noop
;
215 else if (ic_lsize
== 16)
216 r4k_blast_icache_page
= blast_icache16_page
;
217 else if (ic_lsize
== 32)
218 r4k_blast_icache_page
= blast_icache32_page
;
219 else if (ic_lsize
== 64)
220 r4k_blast_icache_page
= blast_icache64_page
;
224 static void (* r4k_blast_icache_page_indexed
)(unsigned long addr
);
226 static void __init
r4k_blast_icache_page_indexed_setup(void)
228 unsigned long ic_lsize
= cpu_icache_line_size();
231 r4k_blast_icache_page_indexed
= (void *)cache_noop
;
232 else if (ic_lsize
== 16)
233 r4k_blast_icache_page_indexed
= blast_icache16_page_indexed
;
234 else if (ic_lsize
== 32) {
235 if (R4600_V1_INDEX_ICACHEOP_WAR
&& cpu_is_r4600_v1_x())
236 r4k_blast_icache_page_indexed
=
237 blast_icache32_r4600_v1_page_indexed
;
238 else if (TX49XX_ICACHE_INDEX_INV_WAR
)
239 r4k_blast_icache_page_indexed
=
240 tx49_blast_icache32_page_indexed
;
242 r4k_blast_icache_page_indexed
=
243 blast_icache32_page_indexed
;
244 } else if (ic_lsize
== 64)
245 r4k_blast_icache_page_indexed
= blast_icache64_page_indexed
;
248 static void (* r4k_blast_icache
)(void);
250 static void __init
r4k_blast_icache_setup(void)
252 unsigned long ic_lsize
= cpu_icache_line_size();
255 r4k_blast_icache
= (void *)cache_noop
;
256 else if (ic_lsize
== 16)
257 r4k_blast_icache
= blast_icache16
;
258 else if (ic_lsize
== 32) {
259 if (R4600_V1_INDEX_ICACHEOP_WAR
&& cpu_is_r4600_v1_x())
260 r4k_blast_icache
= blast_r4600_v1_icache32
;
261 else if (TX49XX_ICACHE_INDEX_INV_WAR
)
262 r4k_blast_icache
= tx49_blast_icache32
;
264 r4k_blast_icache
= blast_icache32
;
265 } else if (ic_lsize
== 64)
266 r4k_blast_icache
= blast_icache64
;
269 static void (* r4k_blast_scache_page
)(unsigned long addr
);
271 static void __init
r4k_blast_scache_page_setup(void)
273 unsigned long sc_lsize
= cpu_scache_line_size();
275 if (scache_size
== 0)
276 r4k_blast_scache_page
= (void *)cache_noop
;
277 else if (sc_lsize
== 16)
278 r4k_blast_scache_page
= blast_scache16_page
;
279 else if (sc_lsize
== 32)
280 r4k_blast_scache_page
= blast_scache32_page
;
281 else if (sc_lsize
== 64)
282 r4k_blast_scache_page
= blast_scache64_page
;
283 else if (sc_lsize
== 128)
284 r4k_blast_scache_page
= blast_scache128_page
;
287 static void (* r4k_blast_scache_page_indexed
)(unsigned long addr
);
289 static void __init
r4k_blast_scache_page_indexed_setup(void)
291 unsigned long sc_lsize
= cpu_scache_line_size();
293 if (scache_size
== 0)
294 r4k_blast_scache_page_indexed
= (void *)cache_noop
;
295 else if (sc_lsize
== 16)
296 r4k_blast_scache_page_indexed
= blast_scache16_page_indexed
;
297 else if (sc_lsize
== 32)
298 r4k_blast_scache_page_indexed
= blast_scache32_page_indexed
;
299 else if (sc_lsize
== 64)
300 r4k_blast_scache_page_indexed
= blast_scache64_page_indexed
;
301 else if (sc_lsize
== 128)
302 r4k_blast_scache_page_indexed
= blast_scache128_page_indexed
;
305 static void (* r4k_blast_scache
)(void);
307 static void __init
r4k_blast_scache_setup(void)
309 unsigned long sc_lsize
= cpu_scache_line_size();
311 if (scache_size
== 0)
312 r4k_blast_scache
= (void *)cache_noop
;
313 else if (sc_lsize
== 16)
314 r4k_blast_scache
= blast_scache16
;
315 else if (sc_lsize
== 32)
316 r4k_blast_scache
= blast_scache32
;
317 else if (sc_lsize
== 64)
318 r4k_blast_scache
= blast_scache64
;
319 else if (sc_lsize
== 128)
320 r4k_blast_scache
= blast_scache128
;
323 static inline void local_r4k___flush_cache_all(void * args
)
325 #if defined(CONFIG_CPU_LOONGSON2)
332 switch (current_cpu_type()) {
344 static void r4k___flush_cache_all(void)
346 r4k_on_each_cpu(local_r4k___flush_cache_all
, NULL
, 1, 1);
349 static inline int has_valid_asid(const struct mm_struct
*mm
)
351 #if defined(CONFIG_MIPS_MT_SMP) || defined(CONFIG_MIPS_MT_SMTC)
354 for_each_online_cpu(i
)
355 if (cpu_context(i
, mm
))
360 return cpu_context(smp_processor_id(), mm
);
364 static inline void local_r4k_flush_cache_range(void * args
)
366 struct vm_area_struct
*vma
= args
;
368 if (!(has_valid_asid(vma
->vm_mm
)))
374 static void r4k_flush_cache_range(struct vm_area_struct
*vma
,
375 unsigned long start
, unsigned long end
)
377 if (!cpu_has_dc_aliases
)
380 r4k_on_each_cpu(local_r4k_flush_cache_range
, vma
, 1, 1);
383 static inline void local_r4k_flush_cache_mm(void * args
)
385 struct mm_struct
*mm
= args
;
387 if (!has_valid_asid(mm
))
391 * Kludge alert. For obscure reasons R4000SC and R4400SC go nuts if we
392 * only flush the primary caches but R10000 and R12000 behave sane ...
393 * R4000SC and R4400SC indexed S-cache ops also invalidate primary
394 * caches, so we can bail out early.
396 if (current_cpu_type() == CPU_R4000SC
||
397 current_cpu_type() == CPU_R4000MC
||
398 current_cpu_type() == CPU_R4400SC
||
399 current_cpu_type() == CPU_R4400MC
) {
407 static void r4k_flush_cache_mm(struct mm_struct
*mm
)
409 if (!cpu_has_dc_aliases
)
412 r4k_on_each_cpu(local_r4k_flush_cache_mm
, mm
, 1, 1);
415 struct flush_cache_page_args
{
416 struct vm_area_struct
*vma
;
421 static inline void local_r4k_flush_cache_page(void *args
)
423 struct flush_cache_page_args
*fcp_args
= args
;
424 struct vm_area_struct
*vma
= fcp_args
->vma
;
425 unsigned long addr
= fcp_args
->addr
;
426 struct page
*page
= pfn_to_page(fcp_args
->pfn
);
427 int exec
= vma
->vm_flags
& VM_EXEC
;
428 struct mm_struct
*mm
= vma
->vm_mm
;
436 * If ownes no valid ASID yet, cannot possibly have gotten
437 * this page into the cache.
439 if (!has_valid_asid(mm
))
443 pgdp
= pgd_offset(mm
, addr
);
444 pudp
= pud_offset(pgdp
, addr
);
445 pmdp
= pmd_offset(pudp
, addr
);
446 ptep
= pte_offset(pmdp
, addr
);
449 * If the page isn't marked valid, the page cannot possibly be
452 if (!(pte_present(*ptep
)))
455 if ((mm
== current
->active_mm
) && (pte_val(*ptep
) & _PAGE_VALID
))
459 * Use kmap_coherent or kmap_atomic to do flushes for
460 * another ASID than the current one.
462 if (cpu_has_dc_aliases
)
463 vaddr
= kmap_coherent(page
, addr
);
465 vaddr
= kmap_atomic(page
, KM_USER0
);
466 addr
= (unsigned long)vaddr
;
469 if (cpu_has_dc_aliases
|| (exec
&& !cpu_has_ic_fills_f_dc
)) {
470 r4k_blast_dcache_page(addr
);
473 if (vaddr
&& cpu_has_vtag_icache
&& mm
== current
->active_mm
) {
474 int cpu
= smp_processor_id();
476 if (cpu_context(cpu
, mm
) != 0)
477 drop_mmu_context(mm
, cpu
);
479 r4k_blast_icache_page(addr
);
483 if (cpu_has_dc_aliases
)
486 kunmap_atomic(vaddr
, KM_USER0
);
490 static void r4k_flush_cache_page(struct vm_area_struct
*vma
,
491 unsigned long addr
, unsigned long pfn
)
493 struct flush_cache_page_args args
;
499 r4k_on_each_cpu(local_r4k_flush_cache_page
, &args
, 1, 1);
502 static inline void local_r4k_flush_data_cache_page(void * addr
)
504 r4k_blast_dcache_page((unsigned long) addr
);
507 static void r4k_flush_data_cache_page(unsigned long addr
)
510 local_r4k_flush_data_cache_page((void *)addr
);
512 r4k_on_each_cpu(local_r4k_flush_data_cache_page
, (void *) addr
,
516 struct flush_icache_range_args
{
521 static inline void local_r4k_flush_icache_range(void *args
)
523 struct flush_icache_range_args
*fir_args
= args
;
524 unsigned long start
= fir_args
->start
;
525 unsigned long end
= fir_args
->end
;
527 if (!cpu_has_ic_fills_f_dc
) {
528 if (end
- start
>= dcache_size
) {
531 R4600_HIT_CACHEOP_WAR_IMPL
;
532 protected_blast_dcache_range(start
, end
);
536 if (end
- start
> icache_size
)
539 protected_blast_icache_range(start
, end
);
542 static void r4k_flush_icache_range(unsigned long start
, unsigned long end
)
544 struct flush_icache_range_args args
;
549 r4k_on_each_cpu(local_r4k_flush_icache_range
, &args
, 1, 1);
550 instruction_hazard();
553 #ifdef CONFIG_DMA_NONCOHERENT
555 static void r4k_dma_cache_wback_inv(unsigned long addr
, unsigned long size
)
557 /* Catch bad driver code */
560 if (cpu_has_inclusive_pcaches
) {
561 if (size
>= scache_size
)
564 blast_scache_range(addr
, addr
+ size
);
569 * Either no secondary cache or the available caches don't have the
570 * subset property so we have to flush the primary caches
573 if (size
>= dcache_size
) {
576 R4600_HIT_CACHEOP_WAR_IMPL
;
577 blast_dcache_range(addr
, addr
+ size
);
580 bc_wback_inv(addr
, size
);
583 static void r4k_dma_cache_inv(unsigned long addr
, unsigned long size
)
585 /* Catch bad driver code */
588 if (cpu_has_inclusive_pcaches
) {
589 if (size
>= scache_size
)
592 blast_inv_scache_range(addr
, addr
+ size
);
596 if (size
>= dcache_size
) {
599 R4600_HIT_CACHEOP_WAR_IMPL
;
600 blast_inv_dcache_range(addr
, addr
+ size
);
605 #endif /* CONFIG_DMA_NONCOHERENT */
608 * While we're protected against bad userland addresses we don't care
609 * very much about what happens in that case. Usually a segmentation
610 * fault will dump the process later on anyway ...
612 static void local_r4k_flush_cache_sigtramp(void * arg
)
614 unsigned long ic_lsize
= cpu_icache_line_size();
615 unsigned long dc_lsize
= cpu_dcache_line_size();
616 unsigned long sc_lsize
= cpu_scache_line_size();
617 unsigned long addr
= (unsigned long) arg
;
619 R4600_HIT_CACHEOP_WAR_IMPL
;
621 protected_writeback_dcache_line(addr
& ~(dc_lsize
- 1));
622 if (!cpu_icache_snoops_remote_store
&& scache_size
)
623 protected_writeback_scache_line(addr
& ~(sc_lsize
- 1));
625 protected_flush_icache_line(addr
& ~(ic_lsize
- 1));
626 if (MIPS4K_ICACHE_REFILL_WAR
) {
627 __asm__
__volatile__ (
642 : "i" (Hit_Invalidate_I
));
644 if (MIPS_CACHE_SYNC_WAR
)
645 __asm__
__volatile__ ("sync");
648 static void r4k_flush_cache_sigtramp(unsigned long addr
)
650 r4k_on_each_cpu(local_r4k_flush_cache_sigtramp
, (void *) addr
, 1, 1);
653 static void r4k_flush_icache_all(void)
655 if (cpu_has_vtag_icache
)
659 static inline void rm7k_erratum31(void)
661 const unsigned long ic_lsize
= 32;
664 /* RM7000 erratum #31. The icache is screwed at startup. */
668 for (addr
= INDEX_BASE
; addr
<= INDEX_BASE
+ 4096; addr
+= ic_lsize
) {
669 __asm__
__volatile__ (
673 "cache\t%1, 0(%0)\n\t"
674 "cache\t%1, 0x1000(%0)\n\t"
675 "cache\t%1, 0x2000(%0)\n\t"
676 "cache\t%1, 0x3000(%0)\n\t"
677 "cache\t%2, 0(%0)\n\t"
678 "cache\t%2, 0x1000(%0)\n\t"
679 "cache\t%2, 0x2000(%0)\n\t"
680 "cache\t%2, 0x3000(%0)\n\t"
681 "cache\t%1, 0(%0)\n\t"
682 "cache\t%1, 0x1000(%0)\n\t"
683 "cache\t%1, 0x2000(%0)\n\t"
684 "cache\t%1, 0x3000(%0)\n\t"
687 : "r" (addr
), "i" (Index_Store_Tag_I
), "i" (Fill
));
691 static char *way_string
[] __initdata
= { NULL
, "direct mapped", "2-way",
692 "3-way", "4-way", "5-way", "6-way", "7-way", "8-way"
695 static void __init
probe_pcache(void)
697 struct cpuinfo_mips
*c
= ¤t_cpu_data
;
698 unsigned int config
= read_c0_config();
699 unsigned int prid
= read_c0_prid();
700 unsigned long config1
;
703 switch (c
->cputype
) {
704 case CPU_R4600
: /* QED style two way caches? */
708 icache_size
= 1 << (12 + ((config
& CONF_IC
) >> 9));
709 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
711 c
->icache
.waybit
= __ffs(icache_size
/2);
713 dcache_size
= 1 << (12 + ((config
& CONF_DC
) >> 6));
714 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
716 c
->dcache
.waybit
= __ffs(dcache_size
/2);
718 c
->options
|= MIPS_CPU_CACHE_CDEX_P
;
723 icache_size
= 1 << (12 + ((config
& CONF_IC
) >> 9));
724 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
728 dcache_size
= 1 << (12 + ((config
& CONF_DC
) >> 6));
729 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
731 c
->dcache
.waybit
= 0;
733 c
->options
|= MIPS_CPU_CACHE_CDEX_P
;
737 icache_size
= 1 << (12 + ((config
& CONF_IC
) >> 9));
738 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
742 dcache_size
= 1 << (12 + ((config
& CONF_DC
) >> 6));
743 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
745 c
->dcache
.waybit
= 0;
747 c
->options
|= MIPS_CPU_CACHE_CDEX_P
;
748 c
->options
|= MIPS_CPU_PREFETCH
;
758 icache_size
= 1 << (12 + ((config
& CONF_IC
) >> 9));
759 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
761 c
->icache
.waybit
= 0; /* doesn't matter */
763 dcache_size
= 1 << (12 + ((config
& CONF_DC
) >> 6));
764 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
766 c
->dcache
.waybit
= 0; /* does not matter */
768 c
->options
|= MIPS_CPU_CACHE_CDEX_P
;
774 icache_size
= 1 << (12 + ((config
& R10K_CONF_IC
) >> 29));
775 c
->icache
.linesz
= 64;
777 c
->icache
.waybit
= 0;
779 dcache_size
= 1 << (12 + ((config
& R10K_CONF_DC
) >> 26));
780 c
->dcache
.linesz
= 32;
782 c
->dcache
.waybit
= 0;
784 c
->options
|= MIPS_CPU_PREFETCH
;
788 write_c0_config(config
& ~VR41_CONF_P4K
);
790 /* Workaround for cache instruction bug of VR4131 */
791 if (c
->processor_id
== 0x0c80U
|| c
->processor_id
== 0x0c81U
||
792 c
->processor_id
== 0x0c82U
) {
793 config
|= 0x00400000U
;
794 if (c
->processor_id
== 0x0c80U
)
795 config
|= VR41_CONF_BP
;
796 write_c0_config(config
);
798 c
->options
|= MIPS_CPU_CACHE_CDEX_P
;
800 icache_size
= 1 << (10 + ((config
& CONF_IC
) >> 9));
801 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
803 c
->icache
.waybit
= __ffs(icache_size
/2);
805 dcache_size
= 1 << (10 + ((config
& CONF_DC
) >> 6));
806 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
808 c
->dcache
.waybit
= __ffs(dcache_size
/2);
817 icache_size
= 1 << (10 + ((config
& CONF_IC
) >> 9));
818 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
820 c
->icache
.waybit
= 0; /* doesn't matter */
822 dcache_size
= 1 << (10 + ((config
& CONF_DC
) >> 6));
823 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
825 c
->dcache
.waybit
= 0; /* does not matter */
827 c
->options
|= MIPS_CPU_CACHE_CDEX_P
;
834 icache_size
= 1 << (12 + ((config
& CONF_IC
) >> 9));
835 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
837 c
->icache
.waybit
= __ffs(icache_size
/ c
->icache
.ways
);
839 dcache_size
= 1 << (12 + ((config
& CONF_DC
) >> 6));
840 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
842 c
->dcache
.waybit
= __ffs(dcache_size
/ c
->dcache
.ways
);
844 #if !defined(CONFIG_SMP) || !defined(RM9000_CDEX_SMP_WAR)
845 c
->options
|= MIPS_CPU_CACHE_CDEX_P
;
847 c
->options
|= MIPS_CPU_PREFETCH
;
851 icache_size
= 1 << (12 + ((config
& CONF_IC
) >> 9));
852 c
->icache
.linesz
= 16 << ((config
& CONF_IB
) >> 5);
857 c
->icache
.waybit
= 0;
859 dcache_size
= 1 << (12 + ((config
& CONF_DC
) >> 6));
860 c
->dcache
.linesz
= 16 << ((config
& CONF_DB
) >> 4);
865 c
->dcache
.waybit
= 0;
869 if (!(config
& MIPS_CONF_M
))
870 panic("Don't know how to probe P-caches on this cpu.");
873 * So we seem to be a MIPS32 or MIPS64 CPU
874 * So let's probe the I-cache ...
876 config1
= read_c0_config1();
878 if ((lsize
= ((config1
>> 19) & 7)))
879 c
->icache
.linesz
= 2 << lsize
;
881 c
->icache
.linesz
= lsize
;
882 c
->icache
.sets
= 64 << ((config1
>> 22) & 7);
883 c
->icache
.ways
= 1 + ((config1
>> 16) & 7);
885 icache_size
= c
->icache
.sets
*
888 c
->icache
.waybit
= __ffs(icache_size
/c
->icache
.ways
);
890 if (config
& 0x8) /* VI bit */
891 c
->icache
.flags
|= MIPS_CACHE_VTAG
;
894 * Now probe the MIPS32 / MIPS64 data cache.
898 if ((lsize
= ((config1
>> 10) & 7)))
899 c
->dcache
.linesz
= 2 << lsize
;
901 c
->dcache
.linesz
= lsize
;
902 c
->dcache
.sets
= 64 << ((config1
>> 13) & 7);
903 c
->dcache
.ways
= 1 + ((config1
>> 7) & 7);
905 dcache_size
= c
->dcache
.sets
*
908 c
->dcache
.waybit
= __ffs(dcache_size
/c
->dcache
.ways
);
910 c
->options
|= MIPS_CPU_PREFETCH
;
915 * Processor configuration sanity check for the R4000SC erratum
916 * #5. With page sizes larger than 32kB there is no possibility
917 * to get a VCE exception anymore so we don't care about this
918 * misconfiguration. The case is rather theoretical anyway;
919 * presumably no vendor is shipping his hardware in the "bad"
922 if ((prid
& 0xff00) == PRID_IMP_R4000
&& (prid
& 0xff) < 0x40 &&
923 !(config
& CONF_SC
) && c
->icache
.linesz
!= 16 &&
925 panic("Improper R4000SC processor configuration detected");
927 /* compute a couple of other cache variables */
928 c
->icache
.waysize
= icache_size
/ c
->icache
.ways
;
929 c
->dcache
.waysize
= dcache_size
/ c
->dcache
.ways
;
931 c
->icache
.sets
= c
->icache
.linesz
?
932 icache_size
/ (c
->icache
.linesz
* c
->icache
.ways
) : 0;
933 c
->dcache
.sets
= c
->dcache
.linesz
?
934 dcache_size
/ (c
->dcache
.linesz
* c
->dcache
.ways
) : 0;
937 * R10000 and R12000 P-caches are odd in a positive way. They're 32kB
938 * 2-way virtually indexed so normally would suffer from aliases. So
939 * normally they'd suffer from aliases but magic in the hardware deals
940 * with that for us so we don't need to take care ourselves.
942 switch (c
->cputype
) {
947 c
->dcache
.flags
|= MIPS_CACHE_PINDEX
;
958 if ((read_c0_config7() & (1 << 16))) {
959 /* effectively physically indexed dcache,
960 thus no virtual aliases. */
961 c
->dcache
.flags
|= MIPS_CACHE_PINDEX
;
965 if (c
->dcache
.waysize
> PAGE_SIZE
)
966 c
->dcache
.flags
|= MIPS_CACHE_ALIASES
;
969 switch (c
->cputype
) {
972 * Some older 20Kc chips doesn't have the 'VI' bit in
973 * the config register.
975 c
->icache
.flags
|= MIPS_CACHE_VTAG
;
985 c
->icache
.flags
|= MIPS_CACHE_IC_F_DC
;
989 #ifdef CONFIG_CPU_LOONGSON2
991 * LOONGSON2 has 4 way icache, but when using indexed cache op,
992 * one op will act on all 4 ways
997 printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
999 cpu_has_vtag_icache
? "VIVT" : "VIPT",
1000 way_string
[c
->icache
.ways
], c
->icache
.linesz
);
1002 printk("Primary data cache %ldkB, %s, %s, %s, linesize %d bytes\n",
1003 dcache_size
>> 10, way_string
[c
->dcache
.ways
],
1004 (c
->dcache
.flags
& MIPS_CACHE_PINDEX
) ? "PIPT" : "VIPT",
1005 (c
->dcache
.flags
& MIPS_CACHE_ALIASES
) ?
1006 "cache aliases" : "no aliases",
1011 * If you even _breathe_ on this function, look at the gcc output and make sure
1012 * it does not pop things on and off the stack for the cache sizing loop that
1013 * executes in KSEG1 space or else you will crash and burn badly. You have
1016 static int __init
probe_scache(void)
1018 unsigned long flags
, addr
, begin
, end
, pow2
;
1019 unsigned int config
= read_c0_config();
1020 struct cpuinfo_mips
*c
= ¤t_cpu_data
;
1023 if (config
& CONF_SC
)
1026 begin
= (unsigned long) &_stext
;
1027 begin
&= ~((4 * 1024 * 1024) - 1);
1028 end
= begin
+ (4 * 1024 * 1024);
1031 * This is such a bitch, you'd think they would make it easy to do
1032 * this. Away you daemons of stupidity!
1034 local_irq_save(flags
);
1036 /* Fill each size-multiple cache line with a valid tag. */
1038 for (addr
= begin
; addr
< end
; addr
= (begin
+ pow2
)) {
1039 unsigned long *p
= (unsigned long *) addr
;
1040 __asm__
__volatile__("nop" : : "r" (*p
)); /* whee... */
1044 /* Load first line with zero (therefore invalid) tag. */
1047 __asm__
__volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
1048 cache_op(Index_Store_Tag_I
, begin
);
1049 cache_op(Index_Store_Tag_D
, begin
);
1050 cache_op(Index_Store_Tag_SD
, begin
);
1052 /* Now search for the wrap around point. */
1053 pow2
= (128 * 1024);
1055 for (addr
= begin
+ (128 * 1024); addr
< end
; addr
= begin
+ pow2
) {
1056 cache_op(Index_Load_Tag_SD
, addr
);
1057 __asm__
__volatile__("nop; nop; nop; nop;"); /* hazard... */
1058 if (!read_c0_taglo())
1062 local_irq_restore(flags
);
1066 c
->scache
.linesz
= 16 << ((config
& R4K_CONF_SB
) >> 22);
1068 c
->dcache
.waybit
= 0; /* does not matter */
1073 #if defined(CONFIG_CPU_LOONGSON2)
1074 static void __init
loongson2_sc_init(void)
1076 struct cpuinfo_mips
*c
= ¤t_cpu_data
;
1078 scache_size
= 512*1024;
1079 c
->scache
.linesz
= 32;
1081 c
->scache
.waybit
= 0;
1082 c
->scache
.waysize
= scache_size
/ (c
->scache
.ways
);
1083 c
->scache
.sets
= scache_size
/ (c
->scache
.linesz
* c
->scache
.ways
);
1084 pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1085 scache_size
>> 10, way_string
[c
->scache
.ways
], c
->scache
.linesz
);
1087 c
->options
|= MIPS_CPU_INCLUSIVE_CACHES
;
1091 extern int r5k_sc_init(void);
1092 extern int rm7k_sc_init(void);
1093 extern int mips_sc_init(void);
1095 static void __init
setup_scache(void)
1097 struct cpuinfo_mips
*c
= ¤t_cpu_data
;
1098 unsigned int config
= read_c0_config();
1102 * Do the probing thing on R4000SC and R4400SC processors. Other
1103 * processors don't have a S-cache that would be relevant to the
1104 * Linux memory management.
1106 switch (c
->cputype
) {
1111 sc_present
= run_uncached(probe_scache
);
1113 c
->options
|= MIPS_CPU_CACHE_CDEX_S
;
1119 scache_size
= 0x80000 << ((config
& R10K_CONF_SS
) >> 16);
1120 c
->scache
.linesz
= 64 << ((config
>> 13) & 1);
1122 c
->scache
.waybit
= 0;
1128 #ifdef CONFIG_R5000_CPU_SCACHE
1135 #ifdef CONFIG_RM7000_CPU_SCACHE
1140 #if defined(CONFIG_CPU_LOONGSON2)
1142 loongson2_sc_init();
1147 if (c
->isa_level
== MIPS_CPU_ISA_M32R1
||
1148 c
->isa_level
== MIPS_CPU_ISA_M32R2
||
1149 c
->isa_level
== MIPS_CPU_ISA_M64R1
||
1150 c
->isa_level
== MIPS_CPU_ISA_M64R2
) {
1151 #ifdef CONFIG_MIPS_CPU_SCACHE
1152 if (mips_sc_init ()) {
1153 scache_size
= c
->scache
.ways
* c
->scache
.sets
* c
->scache
.linesz
;
1154 printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n",
1156 way_string
[c
->scache
.ways
], c
->scache
.linesz
);
1159 if (!(c
->scache
.flags
& MIPS_CACHE_NOT_PRESENT
))
1160 panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
1170 /* compute a couple of other cache variables */
1171 c
->scache
.waysize
= scache_size
/ c
->scache
.ways
;
1173 c
->scache
.sets
= scache_size
/ (c
->scache
.linesz
* c
->scache
.ways
);
1175 printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1176 scache_size
>> 10, way_string
[c
->scache
.ways
], c
->scache
.linesz
);
1178 c
->options
|= MIPS_CPU_INCLUSIVE_CACHES
;
1181 void au1x00_fixup_config_od(void)
1184 * c0_config.od (bit 19) was write only (and read as 0)
1185 * on the early revisions of Alchemy SOCs. It disables the bus
1186 * transaction overlapping and needs to be set to fix various errata.
1188 switch (read_c0_prid()) {
1189 case 0x00030100: /* Au1000 DA */
1190 case 0x00030201: /* Au1000 HA */
1191 case 0x00030202: /* Au1000 HB */
1192 case 0x01030200: /* Au1500 AB */
1194 * Au1100 errata actually keeps silence about this bit, so we set it
1195 * just in case for those revisions that require it to be set according
1196 * to arch/mips/au1000/common/cputable.c
1198 case 0x02030200: /* Au1100 AB */
1199 case 0x02030201: /* Au1100 BA */
1200 case 0x02030202: /* Au1100 BC */
1201 set_c0_config(1 << 19);
1206 static void __init
coherency_setup(void)
1208 change_c0_config(CONF_CM_CMASK
, CONF_CM_DEFAULT
);
1211 * c0_status.cu=0 specifies that updates by the sc instruction use
1212 * the coherency mode specified by the TLB; 1 means cachable
1213 * coherent update on write will be used. Not all processors have
1214 * this bit and; some wire it to zero, others like Toshiba had the
1215 * silly idea of putting something else there ...
1217 switch (current_cpu_type()) {
1224 clear_c0_config(CONF_CU
);
1227 * We need to catch the early Alchemy SOCs with
1228 * the write-only co_config.od bit and set it back to one...
1230 case CPU_AU1000
: /* rev. DA, HA, HB */
1231 case CPU_AU1100
: /* rev. AB, BA, BC ?? */
1232 case CPU_AU1500
: /* rev. AB */
1233 au1x00_fixup_config_od();
1238 void __init
r4k_cache_init(void)
1240 extern void build_clear_page(void);
1241 extern void build_copy_page(void);
1242 extern char __weak except_vec2_generic
;
1243 extern char __weak except_vec2_sb1
;
1244 struct cpuinfo_mips
*c
= ¤t_cpu_data
;
1246 switch (c
->cputype
) {
1249 set_uncached_handler(0x100, &except_vec2_sb1
, 0x80);
1253 set_uncached_handler(0x100, &except_vec2_generic
, 0x80);
1260 r4k_blast_dcache_page_setup();
1261 r4k_blast_dcache_page_indexed_setup();
1262 r4k_blast_dcache_setup();
1263 r4k_blast_icache_page_setup();
1264 r4k_blast_icache_page_indexed_setup();
1265 r4k_blast_icache_setup();
1266 r4k_blast_scache_page_setup();
1267 r4k_blast_scache_page_indexed_setup();
1268 r4k_blast_scache_setup();
1271 * Some MIPS32 and MIPS64 processors have physically indexed caches.
1272 * This code supports virtually indexed processors and will be
1273 * unnecessarily inefficient on physically indexed processors.
1275 if (c
->dcache
.linesz
)
1276 shm_align_mask
= max_t( unsigned long,
1277 c
->dcache
.sets
* c
->dcache
.linesz
- 1,
1280 shm_align_mask
= PAGE_SIZE
-1;
1281 flush_cache_all
= cache_noop
;
1282 __flush_cache_all
= r4k___flush_cache_all
;
1283 flush_cache_mm
= r4k_flush_cache_mm
;
1284 flush_cache_page
= r4k_flush_cache_page
;
1285 flush_cache_range
= r4k_flush_cache_range
;
1287 flush_cache_sigtramp
= r4k_flush_cache_sigtramp
;
1288 flush_icache_all
= r4k_flush_icache_all
;
1289 local_flush_data_cache_page
= local_r4k_flush_data_cache_page
;
1290 flush_data_cache_page
= r4k_flush_data_cache_page
;
1291 flush_icache_range
= r4k_flush_icache_range
;
1293 #ifdef CONFIG_DMA_NONCOHERENT
1294 _dma_cache_wback_inv
= r4k_dma_cache_wback_inv
;
1295 _dma_cache_wback
= r4k_dma_cache_wback_inv
;
1296 _dma_cache_inv
= r4k_dma_cache_inv
;
1301 local_r4k___flush_cache_all(NULL
);