1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
7 * Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Ralf Baechle (ralf@gnu.org)
8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
9 */
10 #include <linux/hardirq.h>
11 #include <linux/init.h>
12 #include <linux/highmem.h>
13 #include <linux/kernel.h>
14 #include <linux/linkage.h>
15 #include <linux/sched.h>
16 #include <linux/smp.h>
17 #include <linux/mm.h>
18 #include <linux/module.h>
19 #include <linux/bitops.h>
20
21 #include <asm/bcache.h>
22 #include <asm/bootinfo.h>
23 #include <asm/cache.h>
24 #include <asm/cacheops.h>
25 #include <asm/cpu.h>
26 #include <asm/cpu-features.h>
27 #include <asm/io.h>
28 #include <asm/page.h>
29 #include <asm/pgtable.h>
30 #include <asm/r4kcache.h>
31 #include <asm/sections.h>
32 #include <asm/system.h>
33 #include <asm/mmu_context.h>
34 #include <asm/war.h>
35 #include <asm/cacheflush.h> /* for run_uncached() */
36
37
38 /*
39 * Special Variant of smp_call_function for use by cache functions:
40 *
41 * o No return value
42 * o collapses to normal function call on UP kernels
43 * o collapses to normal function call on systems with a single shared
44 * primary cache.
45 * o doesn't disable interrupts on the local CPU
46 */
r4k_on_each_cpu(void (* func)(void * info),void * info)47 static inline void r4k_on_each_cpu(void (*func) (void *info), void *info)
48 {
49 preempt_disable();
50
51 #if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC)
52 smp_call_function(func, info, 1);
53 #endif
54 func(info);
55 preempt_enable();
56 }
57
58 #if defined(CONFIG_MIPS_CMP)
59 #define cpu_has_safe_index_cacheops 0
60 #else
61 #define cpu_has_safe_index_cacheops 1
62 #endif
63
64 /*
65 * Must die.
66 */
67 static unsigned long icache_size __read_mostly;
68 static unsigned long dcache_size __read_mostly;
69 static unsigned long scache_size __read_mostly;
70
71 /*
72 * Dummy cache handling routines for machines without boardcaches
73 */
cache_noop(void)74 static void cache_noop(void) {}
75
76 static struct bcache_ops no_sc_ops = {
77 .bc_enable = (void *)cache_noop,
78 .bc_disable = (void *)cache_noop,
79 .bc_wback_inv = (void *)cache_noop,
80 .bc_inv = (void *)cache_noop
81 };
82
83 struct bcache_ops *bcops = &no_sc_ops;
84
85 #define cpu_is_r4600_v1_x() ((read_c0_prid() & 0xfffffff0) == 0x00002010)
86 #define cpu_is_r4600_v2_x() ((read_c0_prid() & 0xfffffff0) == 0x00002020)
87
88 #define R4600_HIT_CACHEOP_WAR_IMPL \
89 do { \
90 if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x()) \
91 *(volatile unsigned long *)CKSEG1; \
92 if (R4600_V1_HIT_CACHEOP_WAR) \
93 __asm__ __volatile__("nop;nop;nop;nop"); \
94 } while (0)
95
96 static void (*r4k_blast_dcache_page)(unsigned long addr);
97
r4k_blast_dcache_page_dc32(unsigned long addr)98 static inline void r4k_blast_dcache_page_dc32(unsigned long addr)
99 {
100 R4600_HIT_CACHEOP_WAR_IMPL;
101 blast_dcache32_page(addr);
102 }
103
r4k_blast_dcache_page_dc64(unsigned long addr)104 static inline void r4k_blast_dcache_page_dc64(unsigned long addr)
105 {
106 R4600_HIT_CACHEOP_WAR_IMPL;
107 blast_dcache64_page(addr);
108 }
109
r4k_blast_dcache_page_setup(void)110 static void __cpuinit r4k_blast_dcache_page_setup(void)
111 {
112 unsigned long dc_lsize = cpu_dcache_line_size();
113
114 if (dc_lsize == 0)
115 r4k_blast_dcache_page = (void *)cache_noop;
116 else if (dc_lsize == 16)
117 r4k_blast_dcache_page = blast_dcache16_page;
118 else if (dc_lsize == 32)
119 r4k_blast_dcache_page = r4k_blast_dcache_page_dc32;
120 else if (dc_lsize == 64)
121 r4k_blast_dcache_page = r4k_blast_dcache_page_dc64;
122 }
123
124 static void (* r4k_blast_dcache_page_indexed)(unsigned long addr);
125
r4k_blast_dcache_page_indexed_setup(void)126 static void __cpuinit r4k_blast_dcache_page_indexed_setup(void)
127 {
128 unsigned long dc_lsize = cpu_dcache_line_size();
129
130 if (dc_lsize == 0)
131 r4k_blast_dcache_page_indexed = (void *)cache_noop;
132 else if (dc_lsize == 16)
133 r4k_blast_dcache_page_indexed = blast_dcache16_page_indexed;
134 else if (dc_lsize == 32)
135 r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed;
136 else if (dc_lsize == 64)
137 r4k_blast_dcache_page_indexed = blast_dcache64_page_indexed;
138 }
139
140 static void (* r4k_blast_dcache)(void);
141
r4k_blast_dcache_setup(void)142 static void __cpuinit r4k_blast_dcache_setup(void)
143 {
144 unsigned long dc_lsize = cpu_dcache_line_size();
145
146 if (dc_lsize == 0)
147 r4k_blast_dcache = (void *)cache_noop;
148 else if (dc_lsize == 16)
149 r4k_blast_dcache = blast_dcache16;
150 else if (dc_lsize == 32)
151 r4k_blast_dcache = blast_dcache32;
152 else if (dc_lsize == 64)
153 r4k_blast_dcache = blast_dcache64;
154 }
155
156 /* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
157 #define JUMP_TO_ALIGN(order) \
158 __asm__ __volatile__( \
159 "b\t1f\n\t" \
160 ".align\t" #order "\n\t" \
161 "1:\n\t" \
162 )
163 #define CACHE32_UNROLL32_ALIGN JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
164 #define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
165
blast_r4600_v1_icache32(void)166 static inline void blast_r4600_v1_icache32(void)
167 {
168 unsigned long flags;
169
170 local_irq_save(flags);
171 blast_icache32();
172 local_irq_restore(flags);
173 }
174
tx49_blast_icache32(void)175 static inline void tx49_blast_icache32(void)
176 {
177 unsigned long start = INDEX_BASE;
178 unsigned long end = start + current_cpu_data.icache.waysize;
179 unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
180 unsigned long ws_end = current_cpu_data.icache.ways <<
181 current_cpu_data.icache.waybit;
182 unsigned long ws, addr;
183
184 CACHE32_UNROLL32_ALIGN2;
185 /* I'm in even chunk. blast odd chunks */
186 for (ws = 0; ws < ws_end; ws += ws_inc)
187 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
188 cache32_unroll32(addr|ws, Index_Invalidate_I);
189 CACHE32_UNROLL32_ALIGN;
190 /* I'm in odd chunk. blast even chunks */
191 for (ws = 0; ws < ws_end; ws += ws_inc)
192 for (addr = start; addr < end; addr += 0x400 * 2)
193 cache32_unroll32(addr|ws, Index_Invalidate_I);
194 }
195
blast_icache32_r4600_v1_page_indexed(unsigned long page)196 static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page)
197 {
198 unsigned long flags;
199
200 local_irq_save(flags);
201 blast_icache32_page_indexed(page);
202 local_irq_restore(flags);
203 }
204
tx49_blast_icache32_page_indexed(unsigned long page)205 static inline void tx49_blast_icache32_page_indexed(unsigned long page)
206 {
207 unsigned long indexmask = current_cpu_data.icache.waysize - 1;
208 unsigned long start = INDEX_BASE + (page & indexmask);
209 unsigned long end = start + PAGE_SIZE;
210 unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
211 unsigned long ws_end = current_cpu_data.icache.ways <<
212 current_cpu_data.icache.waybit;
213 unsigned long ws, addr;
214
215 CACHE32_UNROLL32_ALIGN2;
216 /* I'm in even chunk. blast odd chunks */
217 for (ws = 0; ws < ws_end; ws += ws_inc)
218 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
219 cache32_unroll32(addr|ws, Index_Invalidate_I);
220 CACHE32_UNROLL32_ALIGN;
221 /* I'm in odd chunk. blast even chunks */
222 for (ws = 0; ws < ws_end; ws += ws_inc)
223 for (addr = start; addr < end; addr += 0x400 * 2)
224 cache32_unroll32(addr|ws, Index_Invalidate_I);
225 }
226
227 static void (* r4k_blast_icache_page)(unsigned long addr);
228
r4k_blast_icache_page_setup(void)229 static void __cpuinit r4k_blast_icache_page_setup(void)
230 {
231 unsigned long ic_lsize = cpu_icache_line_size();
232
233 if (ic_lsize == 0)
234 r4k_blast_icache_page = (void *)cache_noop;
235 else if (ic_lsize == 16)
236 r4k_blast_icache_page = blast_icache16_page;
237 else if (ic_lsize == 32)
238 r4k_blast_icache_page = blast_icache32_page;
239 else if (ic_lsize == 64)
240 r4k_blast_icache_page = blast_icache64_page;
241 }
242
243
244 static void (* r4k_blast_icache_page_indexed)(unsigned long addr);
245
r4k_blast_icache_page_indexed_setup(void)246 static void __cpuinit r4k_blast_icache_page_indexed_setup(void)
247 {
248 unsigned long ic_lsize = cpu_icache_line_size();
249
250 if (ic_lsize == 0)
251 r4k_blast_icache_page_indexed = (void *)cache_noop;
252 else if (ic_lsize == 16)
253 r4k_blast_icache_page_indexed = blast_icache16_page_indexed;
254 else if (ic_lsize == 32) {
255 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
256 r4k_blast_icache_page_indexed =
257 blast_icache32_r4600_v1_page_indexed;
258 else if (TX49XX_ICACHE_INDEX_INV_WAR)
259 r4k_blast_icache_page_indexed =
260 tx49_blast_icache32_page_indexed;
261 else
262 r4k_blast_icache_page_indexed =
263 blast_icache32_page_indexed;
264 } else if (ic_lsize == 64)
265 r4k_blast_icache_page_indexed = blast_icache64_page_indexed;
266 }
267
268 static void (* r4k_blast_icache)(void);
269
r4k_blast_icache_setup(void)270 static void __cpuinit r4k_blast_icache_setup(void)
271 {
272 unsigned long ic_lsize = cpu_icache_line_size();
273
274 if (ic_lsize == 0)
275 r4k_blast_icache = (void *)cache_noop;
276 else if (ic_lsize == 16)
277 r4k_blast_icache = blast_icache16;
278 else if (ic_lsize == 32) {
279 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
280 r4k_blast_icache = blast_r4600_v1_icache32;
281 else if (TX49XX_ICACHE_INDEX_INV_WAR)
282 r4k_blast_icache = tx49_blast_icache32;
283 else
284 r4k_blast_icache = blast_icache32;
285 } else if (ic_lsize == 64)
286 r4k_blast_icache = blast_icache64;
287 }
288
289 static void (* r4k_blast_scache_page)(unsigned long addr);
290
r4k_blast_scache_page_setup(void)291 static void __cpuinit r4k_blast_scache_page_setup(void)
292 {
293 unsigned long sc_lsize = cpu_scache_line_size();
294
295 if (scache_size == 0)
296 r4k_blast_scache_page = (void *)cache_noop;
297 else if (sc_lsize == 16)
298 r4k_blast_scache_page = blast_scache16_page;
299 else if (sc_lsize == 32)
300 r4k_blast_scache_page = blast_scache32_page;
301 else if (sc_lsize == 64)
302 r4k_blast_scache_page = blast_scache64_page;
303 else if (sc_lsize == 128)
304 r4k_blast_scache_page = blast_scache128_page;
305 }
306
307 static void (* r4k_blast_scache_page_indexed)(unsigned long addr);
308
r4k_blast_scache_page_indexed_setup(void)309 static void __cpuinit r4k_blast_scache_page_indexed_setup(void)
310 {
311 unsigned long sc_lsize = cpu_scache_line_size();
312
313 if (scache_size == 0)
314 r4k_blast_scache_page_indexed = (void *)cache_noop;
315 else if (sc_lsize == 16)
316 r4k_blast_scache_page_indexed = blast_scache16_page_indexed;
317 else if (sc_lsize == 32)
318 r4k_blast_scache_page_indexed = blast_scache32_page_indexed;
319 else if (sc_lsize == 64)
320 r4k_blast_scache_page_indexed = blast_scache64_page_indexed;
321 else if (sc_lsize == 128)
322 r4k_blast_scache_page_indexed = blast_scache128_page_indexed;
323 }
324
325 static void (* r4k_blast_scache)(void);
326
r4k_blast_scache_setup(void)327 static void __cpuinit r4k_blast_scache_setup(void)
328 {
329 unsigned long sc_lsize = cpu_scache_line_size();
330
331 if (scache_size == 0)
332 r4k_blast_scache = (void *)cache_noop;
333 else if (sc_lsize == 16)
334 r4k_blast_scache = blast_scache16;
335 else if (sc_lsize == 32)
336 r4k_blast_scache = blast_scache32;
337 else if (sc_lsize == 64)
338 r4k_blast_scache = blast_scache64;
339 else if (sc_lsize == 128)
340 r4k_blast_scache = blast_scache128;
341 }
342
local_r4k___flush_cache_all(void * args)343 static inline void local_r4k___flush_cache_all(void * args)
344 {
345 #if defined(CONFIG_CPU_LOONGSON2)
346 r4k_blast_scache();
347 return;
348 #endif
349 r4k_blast_dcache();
350 r4k_blast_icache();
351
352 switch (current_cpu_type()) {
353 case CPU_R4000SC:
354 case CPU_R4000MC:
355 case CPU_R4400SC:
356 case CPU_R4400MC:
357 case CPU_R10000:
358 case CPU_R12000:
359 case CPU_R14000:
360 r4k_blast_scache();
361 }
362 }
363
r4k___flush_cache_all(void)364 static void r4k___flush_cache_all(void)
365 {
366 r4k_on_each_cpu(local_r4k___flush_cache_all, NULL);
367 }
368
has_valid_asid(const struct mm_struct * mm)369 static inline int has_valid_asid(const struct mm_struct *mm)
370 {
371 #if defined(CONFIG_MIPS_MT_SMP) || defined(CONFIG_MIPS_MT_SMTC)
372 int i;
373
374 for_each_online_cpu(i)
375 if (cpu_context(i, mm))
376 return 1;
377
378 return 0;
379 #else
380 return cpu_context(smp_processor_id(), mm);
381 #endif
382 }
383
r4k__flush_cache_vmap(void)384 static void r4k__flush_cache_vmap(void)
385 {
386 r4k_blast_dcache();
387 }
388
r4k__flush_cache_vunmap(void)389 static void r4k__flush_cache_vunmap(void)
390 {
391 r4k_blast_dcache();
392 }
393
local_r4k_flush_cache_range(void * args)394 static inline void local_r4k_flush_cache_range(void * args)
395 {
396 struct vm_area_struct *vma = args;
397 int exec = vma->vm_flags & VM_EXEC;
398
399 if (!(has_valid_asid(vma->vm_mm)))
400 return;
401
402 r4k_blast_dcache();
403 if (exec)
404 r4k_blast_icache();
405 }
406
r4k_flush_cache_range(struct vm_area_struct * vma,unsigned long start,unsigned long end)407 static void r4k_flush_cache_range(struct vm_area_struct *vma,
408 unsigned long start, unsigned long end)
409 {
410 int exec = vma->vm_flags & VM_EXEC;
411
412 if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc))
413 r4k_on_each_cpu(local_r4k_flush_cache_range, vma);
414 }
415
local_r4k_flush_cache_mm(void * args)416 static inline void local_r4k_flush_cache_mm(void * args)
417 {
418 struct mm_struct *mm = args;
419
420 if (!has_valid_asid(mm))
421 return;
422
423 /*
424 * Kludge alert. For obscure reasons R4000SC and R4400SC go nuts if we
425 * only flush the primary caches but R10000 and R12000 behave sane ...
426 * R4000SC and R4400SC indexed S-cache ops also invalidate primary
427 * caches, so we can bail out early.
428 */
429 if (current_cpu_type() == CPU_R4000SC ||
430 current_cpu_type() == CPU_R4000MC ||
431 current_cpu_type() == CPU_R4400SC ||
432 current_cpu_type() == CPU_R4400MC) {
433 r4k_blast_scache();
434 return;
435 }
436
437 r4k_blast_dcache();
438 }
439
r4k_flush_cache_mm(struct mm_struct * mm)440 static void r4k_flush_cache_mm(struct mm_struct *mm)
441 {
442 if (!cpu_has_dc_aliases)
443 return;
444
445 r4k_on_each_cpu(local_r4k_flush_cache_mm, mm);
446 }
447
448 struct flush_cache_page_args {
449 struct vm_area_struct *vma;
450 unsigned long addr;
451 unsigned long pfn;
452 };
453
local_r4k_flush_cache_page(void * args)454 static inline void local_r4k_flush_cache_page(void *args)
455 {
456 struct flush_cache_page_args *fcp_args = args;
457 struct vm_area_struct *vma = fcp_args->vma;
458 unsigned long addr = fcp_args->addr;
459 struct page *page = pfn_to_page(fcp_args->pfn);
460 int exec = vma->vm_flags & VM_EXEC;
461 struct mm_struct *mm = vma->vm_mm;
462 int map_coherent = 0;
463 pgd_t *pgdp;
464 pud_t *pudp;
465 pmd_t *pmdp;
466 pte_t *ptep;
467 void *vaddr;
468
469 /*
470 * If ownes no valid ASID yet, cannot possibly have gotten
471 * this page into the cache.
472 */
473 if (!has_valid_asid(mm))
474 return;
475
476 addr &= PAGE_MASK;
477 pgdp = pgd_offset(mm, addr);
478 pudp = pud_offset(pgdp, addr);
479 pmdp = pmd_offset(pudp, addr);
480 ptep = pte_offset(pmdp, addr);
481
482 /*
483 * If the page isn't marked valid, the page cannot possibly be
484 * in the cache.
485 */
486 if (!(pte_present(*ptep)))
487 return;
488
489 if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID))
490 vaddr = NULL;
491 else {
492 /*
493 * Use kmap_coherent or kmap_atomic to do flushes for
494 * another ASID than the current one.
495 */
496 map_coherent = (cpu_has_dc_aliases &&
497 page_mapped(page) && !Page_dcache_dirty(page));
498 if (map_coherent)
499 vaddr = kmap_coherent(page, addr);
500 else
501 vaddr = kmap_atomic(page, KM_USER0);
502 addr = (unsigned long)vaddr;
503 }
504
505 if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
506 r4k_blast_dcache_page(addr);
507 if (exec && !cpu_icache_snoops_remote_store)
508 r4k_blast_scache_page(addr);
509 }
510 if (exec) {
511 if (vaddr && cpu_has_vtag_icache && mm == current->active_mm) {
512 int cpu = smp_processor_id();
513
514 if (cpu_context(cpu, mm) != 0)
515 drop_mmu_context(mm, cpu);
516 } else
517 r4k_blast_icache_page(addr);
518 }
519
520 if (vaddr) {
521 if (map_coherent)
522 kunmap_coherent();
523 else
524 kunmap_atomic(vaddr, KM_USER0);
525 }
526 }
527
r4k_flush_cache_page(struct vm_area_struct * vma,unsigned long addr,unsigned long pfn)528 static void r4k_flush_cache_page(struct vm_area_struct *vma,
529 unsigned long addr, unsigned long pfn)
530 {
531 struct flush_cache_page_args args;
532
533 args.vma = vma;
534 args.addr = addr;
535 args.pfn = pfn;
536
537 r4k_on_each_cpu(local_r4k_flush_cache_page, &args);
538 }
539
local_r4k_flush_data_cache_page(void * addr)540 static inline void local_r4k_flush_data_cache_page(void * addr)
541 {
542 r4k_blast_dcache_page((unsigned long) addr);
543 }
544
r4k_flush_data_cache_page(unsigned long addr)545 static void r4k_flush_data_cache_page(unsigned long addr)
546 {
547 if (in_atomic())
548 local_r4k_flush_data_cache_page((void *)addr);
549 else
550 r4k_on_each_cpu(local_r4k_flush_data_cache_page, (void *) addr);
551 }
552
553 struct flush_icache_range_args {
554 unsigned long start;
555 unsigned long end;
556 };
557
local_r4k_flush_icache_range(unsigned long start,unsigned long end)558 static inline void local_r4k_flush_icache_range(unsigned long start, unsigned long end)
559 {
560 if (!cpu_has_ic_fills_f_dc) {
561 if (end - start >= dcache_size) {
562 r4k_blast_dcache();
563 } else {
564 R4600_HIT_CACHEOP_WAR_IMPL;
565 protected_blast_dcache_range(start, end);
566 }
567 }
568
569 if (end - start > icache_size)
570 r4k_blast_icache();
571 else
572 protected_blast_icache_range(start, end);
573 }
574
local_r4k_flush_icache_range_ipi(void * args)575 static inline void local_r4k_flush_icache_range_ipi(void *args)
576 {
577 struct flush_icache_range_args *fir_args = args;
578 unsigned long start = fir_args->start;
579 unsigned long end = fir_args->end;
580
581 local_r4k_flush_icache_range(start, end);
582 }
583
r4k_flush_icache_range(unsigned long start,unsigned long end)584 static void r4k_flush_icache_range(unsigned long start, unsigned long end)
585 {
586 struct flush_icache_range_args args;
587
588 args.start = start;
589 args.end = end;
590
591 r4k_on_each_cpu(local_r4k_flush_icache_range_ipi, &args);
592 instruction_hazard();
593 }
594
595 #ifdef CONFIG_DMA_NONCOHERENT
596
r4k_dma_cache_wback_inv(unsigned long addr,unsigned long size)597 static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
598 {
599 /* Catch bad driver code */
600 BUG_ON(size == 0);
601
602 if (cpu_has_inclusive_pcaches) {
603 if (size >= scache_size)
604 r4k_blast_scache();
605 else
606 blast_scache_range(addr, addr + size);
607 return;
608 }
609
610 /*
611 * Either no secondary cache or the available caches don't have the
612 * subset property so we have to flush the primary caches
613 * explicitly
614 */
615 if (cpu_has_safe_index_cacheops && size >= dcache_size) {
616 r4k_blast_dcache();
617 } else {
618 R4600_HIT_CACHEOP_WAR_IMPL;
619 blast_dcache_range(addr, addr + size);
620 }
621
622 bc_wback_inv(addr, size);
623 }
624
r4k_dma_cache_inv(unsigned long addr,unsigned long size)625 static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
626 {
627 /* Catch bad driver code */
628 BUG_ON(size == 0);
629
630 if (cpu_has_inclusive_pcaches) {
631 if (size >= scache_size)
632 r4k_blast_scache();
633 else {
634 unsigned long lsize = cpu_scache_line_size();
635 unsigned long almask = ~(lsize - 1);
636
637 /*
638 * There is no clearly documented alignment requirement
639 * for the cache instruction on MIPS processors and
640 * some processors, among them the RM5200 and RM7000
641 * QED processors will throw an address error for cache
642 * hit ops with insufficient alignment. Solved by
643 * aligning the address to cache line size.
644 */
645 cache_op(Hit_Writeback_Inv_SD, addr & almask);
646 cache_op(Hit_Writeback_Inv_SD,
647 (addr + size - 1) & almask);
648 blast_inv_scache_range(addr, addr + size);
649 }
650 return;
651 }
652
653 if (cpu_has_safe_index_cacheops && size >= dcache_size) {
654 r4k_blast_dcache();
655 } else {
656 unsigned long lsize = cpu_dcache_line_size();
657 unsigned long almask = ~(lsize - 1);
658
659 R4600_HIT_CACHEOP_WAR_IMPL;
660 cache_op(Hit_Writeback_Inv_D, addr & almask);
661 cache_op(Hit_Writeback_Inv_D, (addr + size - 1) & almask);
662 blast_inv_dcache_range(addr, addr + size);
663 }
664
665 bc_inv(addr, size);
666 }
667 #endif /* CONFIG_DMA_NONCOHERENT */
668
669 /*
670 * While we're protected against bad userland addresses we don't care
671 * very much about what happens in that case. Usually a segmentation
672 * fault will dump the process later on anyway ...
673 */
local_r4k_flush_cache_sigtramp(void * arg)674 static void local_r4k_flush_cache_sigtramp(void * arg)
675 {
676 unsigned long ic_lsize = cpu_icache_line_size();
677 unsigned long dc_lsize = cpu_dcache_line_size();
678 unsigned long sc_lsize = cpu_scache_line_size();
679 unsigned long addr = (unsigned long) arg;
680
681 R4600_HIT_CACHEOP_WAR_IMPL;
682 if (dc_lsize)
683 protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
684 if (!cpu_icache_snoops_remote_store && scache_size)
685 protected_writeback_scache_line(addr & ~(sc_lsize - 1));
686 if (ic_lsize)
687 protected_flush_icache_line(addr & ~(ic_lsize - 1));
688 if (MIPS4K_ICACHE_REFILL_WAR) {
689 __asm__ __volatile__ (
690 ".set push\n\t"
691 ".set noat\n\t"
692 ".set mips3\n\t"
693 #ifdef CONFIG_32BIT
694 "la $at,1f\n\t"
695 #endif
696 #ifdef CONFIG_64BIT
697 "dla $at,1f\n\t"
698 #endif
699 "cache %0,($at)\n\t"
700 "nop; nop; nop\n"
701 "1:\n\t"
702 ".set pop"
703 :
704 : "i" (Hit_Invalidate_I));
705 }
706 if (MIPS_CACHE_SYNC_WAR)
707 __asm__ __volatile__ ("sync");
708 }
709
r4k_flush_cache_sigtramp(unsigned long addr)710 static void r4k_flush_cache_sigtramp(unsigned long addr)
711 {
712 r4k_on_each_cpu(local_r4k_flush_cache_sigtramp, (void *) addr);
713 }
714
r4k_flush_icache_all(void)715 static void r4k_flush_icache_all(void)
716 {
717 if (cpu_has_vtag_icache)
718 r4k_blast_icache();
719 }
720
rm7k_erratum31(void)721 static inline void rm7k_erratum31(void)
722 {
723 const unsigned long ic_lsize = 32;
724 unsigned long addr;
725
726 /* RM7000 erratum #31. The icache is screwed at startup. */
727 write_c0_taglo(0);
728 write_c0_taghi(0);
729
730 for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) {
731 __asm__ __volatile__ (
732 ".set push\n\t"
733 ".set noreorder\n\t"
734 ".set mips3\n\t"
735 "cache\t%1, 0(%0)\n\t"
736 "cache\t%1, 0x1000(%0)\n\t"
737 "cache\t%1, 0x2000(%0)\n\t"
738 "cache\t%1, 0x3000(%0)\n\t"
739 "cache\t%2, 0(%0)\n\t"
740 "cache\t%2, 0x1000(%0)\n\t"
741 "cache\t%2, 0x2000(%0)\n\t"
742 "cache\t%2, 0x3000(%0)\n\t"
743 "cache\t%1, 0(%0)\n\t"
744 "cache\t%1, 0x1000(%0)\n\t"
745 "cache\t%1, 0x2000(%0)\n\t"
746 "cache\t%1, 0x3000(%0)\n\t"
747 ".set pop\n"
748 :
749 : "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill));
750 }
751 }
752
753 static char *way_string[] __cpuinitdata = { NULL, "direct mapped", "2-way",
754 "3-way", "4-way", "5-way", "6-way", "7-way", "8-way"
755 };
756
probe_pcache(void)757 static void __cpuinit probe_pcache(void)
758 {
759 struct cpuinfo_mips *c = ¤t_cpu_data;
760 unsigned int config = read_c0_config();
761 unsigned int prid = read_c0_prid();
762 unsigned long config1;
763 unsigned int lsize;
764
765 switch (c->cputype) {
766 case CPU_R4600: /* QED style two way caches? */
767 case CPU_R4700:
768 case CPU_R5000:
769 case CPU_NEVADA:
770 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
771 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
772 c->icache.ways = 2;
773 c->icache.waybit = __ffs(icache_size/2);
774
775 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
776 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
777 c->dcache.ways = 2;
778 c->dcache.waybit= __ffs(dcache_size/2);
779
780 c->options |= MIPS_CPU_CACHE_CDEX_P;
781 break;
782
783 case CPU_R5432:
784 case CPU_R5500:
785 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
786 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
787 c->icache.ways = 2;
788 c->icache.waybit= 0;
789
790 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
791 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
792 c->dcache.ways = 2;
793 c->dcache.waybit = 0;
794
795 c->options |= MIPS_CPU_CACHE_CDEX_P | MIPS_CPU_PREFETCH;
796 break;
797
798 case CPU_TX49XX:
799 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
800 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
801 c->icache.ways = 4;
802 c->icache.waybit= 0;
803
804 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
805 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
806 c->dcache.ways = 4;
807 c->dcache.waybit = 0;
808
809 c->options |= MIPS_CPU_CACHE_CDEX_P;
810 c->options |= MIPS_CPU_PREFETCH;
811 break;
812
813 case CPU_R4000PC:
814 case CPU_R4000SC:
815 case CPU_R4000MC:
816 case CPU_R4400PC:
817 case CPU_R4400SC:
818 case CPU_R4400MC:
819 case CPU_R4300:
820 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
821 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
822 c->icache.ways = 1;
823 c->icache.waybit = 0; /* doesn't matter */
824
825 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
826 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
827 c->dcache.ways = 1;
828 c->dcache.waybit = 0; /* does not matter */
829
830 c->options |= MIPS_CPU_CACHE_CDEX_P;
831 break;
832
833 case CPU_R10000:
834 case CPU_R12000:
835 case CPU_R14000:
836 icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29));
837 c->icache.linesz = 64;
838 c->icache.ways = 2;
839 c->icache.waybit = 0;
840
841 dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26));
842 c->dcache.linesz = 32;
843 c->dcache.ways = 2;
844 c->dcache.waybit = 0;
845
846 c->options |= MIPS_CPU_PREFETCH;
847 break;
848
849 case CPU_VR4133:
850 write_c0_config(config & ~VR41_CONF_P4K);
851 case CPU_VR4131:
852 /* Workaround for cache instruction bug of VR4131 */
853 if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U ||
854 c->processor_id == 0x0c82U) {
855 config |= 0x00400000U;
856 if (c->processor_id == 0x0c80U)
857 config |= VR41_CONF_BP;
858 write_c0_config(config);
859 } else
860 c->options |= MIPS_CPU_CACHE_CDEX_P;
861
862 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
863 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
864 c->icache.ways = 2;
865 c->icache.waybit = __ffs(icache_size/2);
866
867 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
868 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
869 c->dcache.ways = 2;
870 c->dcache.waybit = __ffs(dcache_size/2);
871 break;
872
873 case CPU_VR41XX:
874 case CPU_VR4111:
875 case CPU_VR4121:
876 case CPU_VR4122:
877 case CPU_VR4181:
878 case CPU_VR4181A:
879 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
880 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
881 c->icache.ways = 1;
882 c->icache.waybit = 0; /* doesn't matter */
883
884 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
885 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
886 c->dcache.ways = 1;
887 c->dcache.waybit = 0; /* does not matter */
888
889 c->options |= MIPS_CPU_CACHE_CDEX_P;
890 break;
891
892 case CPU_RM7000:
893 rm7k_erratum31();
894
895 case CPU_RM9000:
896 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
897 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
898 c->icache.ways = 4;
899 c->icache.waybit = __ffs(icache_size / c->icache.ways);
900
901 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
902 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
903 c->dcache.ways = 4;
904 c->dcache.waybit = __ffs(dcache_size / c->dcache.ways);
905
906 #if !defined(CONFIG_SMP) || !defined(RM9000_CDEX_SMP_WAR)
907 c->options |= MIPS_CPU_CACHE_CDEX_P;
908 #endif
909 c->options |= MIPS_CPU_PREFETCH;
910 break;
911
912 case CPU_LOONGSON2:
913 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
914 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
915 if (prid & 0x3)
916 c->icache.ways = 4;
917 else
918 c->icache.ways = 2;
919 c->icache.waybit = 0;
920
921 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
922 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
923 if (prid & 0x3)
924 c->dcache.ways = 4;
925 else
926 c->dcache.ways = 2;
927 c->dcache.waybit = 0;
928 break;
929
930 default:
931 if (!(config & MIPS_CONF_M))
932 panic("Don't know how to probe P-caches on this cpu.");
933
934 /*
935 * So we seem to be a MIPS32 or MIPS64 CPU
936 * So let's probe the I-cache ...
937 */
938 config1 = read_c0_config1();
939
940 if ((lsize = ((config1 >> 19) & 7)))
941 c->icache.linesz = 2 << lsize;
942 else
943 c->icache.linesz = lsize;
944 c->icache.sets = 64 << ((config1 >> 22) & 7);
945 c->icache.ways = 1 + ((config1 >> 16) & 7);
946
947 icache_size = c->icache.sets *
948 c->icache.ways *
949 c->icache.linesz;
950 c->icache.waybit = __ffs(icache_size/c->icache.ways);
951
952 if (config & 0x8) /* VI bit */
953 c->icache.flags |= MIPS_CACHE_VTAG;
954
955 /*
956 * Now probe the MIPS32 / MIPS64 data cache.
957 */
958 c->dcache.flags = 0;
959
960 if ((lsize = ((config1 >> 10) & 7)))
961 c->dcache.linesz = 2 << lsize;
962 else
963 c->dcache.linesz= lsize;
964 c->dcache.sets = 64 << ((config1 >> 13) & 7);
965 c->dcache.ways = 1 + ((config1 >> 7) & 7);
966
967 dcache_size = c->dcache.sets *
968 c->dcache.ways *
969 c->dcache.linesz;
970 c->dcache.waybit = __ffs(dcache_size/c->dcache.ways);
971
972 c->options |= MIPS_CPU_PREFETCH;
973 break;
974 }
975
976 /*
977 * Processor configuration sanity check for the R4000SC erratum
978 * #5. With page sizes larger than 32kB there is no possibility
979 * to get a VCE exception anymore so we don't care about this
980 * misconfiguration. The case is rather theoretical anyway;
981 * presumably no vendor is shipping his hardware in the "bad"
982 * configuration.
983 */
984 if ((prid & 0xff00) == PRID_IMP_R4000 && (prid & 0xff) < 0x40 &&
985 !(config & CONF_SC) && c->icache.linesz != 16 &&
986 PAGE_SIZE <= 0x8000)
987 panic("Improper R4000SC processor configuration detected");
988
989 /* compute a couple of other cache variables */
990 c->icache.waysize = icache_size / c->icache.ways;
991 c->dcache.waysize = dcache_size / c->dcache.ways;
992
993 c->icache.sets = c->icache.linesz ?
994 icache_size / (c->icache.linesz * c->icache.ways) : 0;
995 c->dcache.sets = c->dcache.linesz ?
996 dcache_size / (c->dcache.linesz * c->dcache.ways) : 0;
997
998 /*
999 * R10000 and R12000 P-caches are odd in a positive way. They're 32kB
1000 * 2-way virtually indexed so normally would suffer from aliases. So
1001 * normally they'd suffer from aliases but magic in the hardware deals
1002 * with that for us so we don't need to take care ourselves.
1003 */
1004 switch (c->cputype) {
1005 case CPU_20KC:
1006 case CPU_25KF:
1007 case CPU_SB1:
1008 case CPU_SB1A:
1009 c->dcache.flags |= MIPS_CACHE_PINDEX;
1010 break;
1011
1012 case CPU_R10000:
1013 case CPU_R12000:
1014 case CPU_R14000:
1015 break;
1016
1017 case CPU_24K:
1018 case CPU_34K:
1019 case CPU_74K:
1020 case CPU_1004K:
1021 if ((read_c0_config7() & (1 << 16))) {
1022 /* effectively physically indexed dcache,
1023 thus no virtual aliases. */
1024 c->dcache.flags |= MIPS_CACHE_PINDEX;
1025 break;
1026 }
1027 default:
1028 if (c->dcache.waysize > PAGE_SIZE)
1029 c->dcache.flags |= MIPS_CACHE_ALIASES;
1030 }
1031
1032 switch (c->cputype) {
1033 case CPU_20KC:
1034 /*
1035 * Some older 20Kc chips doesn't have the 'VI' bit in
1036 * the config register.
1037 */
1038 c->icache.flags |= MIPS_CACHE_VTAG;
1039 break;
1040
1041 case CPU_ALCHEMY:
1042 c->icache.flags |= MIPS_CACHE_IC_F_DC;
1043 break;
1044 }
1045
1046 #ifdef CONFIG_CPU_LOONGSON2
1047 /*
1048 * LOONGSON2 has 4 way icache, but when using indexed cache op,
1049 * one op will act on all 4 ways
1050 */
1051 c->icache.ways = 1;
1052 #endif
1053
1054 printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
1055 icache_size >> 10,
1056 c->icache.flags & MIPS_CACHE_VTAG ? "VIVT" : "VIPT",
1057 way_string[c->icache.ways], c->icache.linesz);
1058
1059 printk("Primary data cache %ldkB, %s, %s, %s, linesize %d bytes\n",
1060 dcache_size >> 10, way_string[c->dcache.ways],
1061 (c->dcache.flags & MIPS_CACHE_PINDEX) ? "PIPT" : "VIPT",
1062 (c->dcache.flags & MIPS_CACHE_ALIASES) ?
1063 "cache aliases" : "no aliases",
1064 c->dcache.linesz);
1065 }
1066
1067 /*
1068 * If you even _breathe_ on this function, look at the gcc output and make sure
1069 * it does not pop things on and off the stack for the cache sizing loop that
1070 * executes in KSEG1 space or else you will crash and burn badly. You have
1071 * been warned.
1072 */
probe_scache(void)1073 static int __cpuinit probe_scache(void)
1074 {
1075 unsigned long flags, addr, begin, end, pow2;
1076 unsigned int config = read_c0_config();
1077 struct cpuinfo_mips *c = ¤t_cpu_data;
1078
1079 if (config & CONF_SC)
1080 return 0;
1081
1082 begin = (unsigned long) &_stext;
1083 begin &= ~((4 * 1024 * 1024) - 1);
1084 end = begin + (4 * 1024 * 1024);
1085
1086 /*
1087 * This is such a bitch, you'd think they would make it easy to do
1088 * this. Away you daemons of stupidity!
1089 */
1090 local_irq_save(flags);
1091
1092 /* Fill each size-multiple cache line with a valid tag. */
1093 pow2 = (64 * 1024);
1094 for (addr = begin; addr < end; addr = (begin + pow2)) {
1095 unsigned long *p = (unsigned long *) addr;
1096 __asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
1097 pow2 <<= 1;
1098 }
1099
1100 /* Load first line with zero (therefore invalid) tag. */
1101 write_c0_taglo(0);
1102 write_c0_taghi(0);
1103 __asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
1104 cache_op(Index_Store_Tag_I, begin);
1105 cache_op(Index_Store_Tag_D, begin);
1106 cache_op(Index_Store_Tag_SD, begin);
1107
1108 /* Now search for the wrap around point. */
1109 pow2 = (128 * 1024);
1110 for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) {
1111 cache_op(Index_Load_Tag_SD, addr);
1112 __asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
1113 if (!read_c0_taglo())
1114 break;
1115 pow2 <<= 1;
1116 }
1117 local_irq_restore(flags);
1118 addr -= begin;
1119
1120 scache_size = addr;
1121 c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22);
1122 c->scache.ways = 1;
1123 c->dcache.waybit = 0; /* does not matter */
1124
1125 return 1;
1126 }
1127
1128 #if defined(CONFIG_CPU_LOONGSON2)
loongson2_sc_init(void)1129 static void __init loongson2_sc_init(void)
1130 {
1131 struct cpuinfo_mips *c = ¤t_cpu_data;
1132
1133 scache_size = 512*1024;
1134 c->scache.linesz = 32;
1135 c->scache.ways = 4;
1136 c->scache.waybit = 0;
1137 c->scache.waysize = scache_size / (c->scache.ways);
1138 c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1139 pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1140 scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1141
1142 c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1143 }
1144 #endif
1145
1146 extern int r5k_sc_init(void);
1147 extern int rm7k_sc_init(void);
1148 extern int mips_sc_init(void);
1149
setup_scache(void)1150 static void __cpuinit setup_scache(void)
1151 {
1152 struct cpuinfo_mips *c = ¤t_cpu_data;
1153 unsigned int config = read_c0_config();
1154 int sc_present = 0;
1155
1156 /*
1157 * Do the probing thing on R4000SC and R4400SC processors. Other
1158 * processors don't have a S-cache that would be relevant to the
1159 * Linux memory management.
1160 */
1161 switch (c->cputype) {
1162 case CPU_R4000SC:
1163 case CPU_R4000MC:
1164 case CPU_R4400SC:
1165 case CPU_R4400MC:
1166 sc_present = run_uncached(probe_scache);
1167 if (sc_present)
1168 c->options |= MIPS_CPU_CACHE_CDEX_S;
1169 break;
1170
1171 case CPU_R10000:
1172 case CPU_R12000:
1173 case CPU_R14000:
1174 scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16);
1175 c->scache.linesz = 64 << ((config >> 13) & 1);
1176 c->scache.ways = 2;
1177 c->scache.waybit= 0;
1178 sc_present = 1;
1179 break;
1180
1181 case CPU_R5000:
1182 case CPU_NEVADA:
1183 #ifdef CONFIG_R5000_CPU_SCACHE
1184 r5k_sc_init();
1185 #endif
1186 return;
1187
1188 case CPU_RM7000:
1189 case CPU_RM9000:
1190 #ifdef CONFIG_RM7000_CPU_SCACHE
1191 rm7k_sc_init();
1192 #endif
1193 return;
1194
1195 #if defined(CONFIG_CPU_LOONGSON2)
1196 case CPU_LOONGSON2:
1197 loongson2_sc_init();
1198 return;
1199 #endif
1200
1201 default:
1202 if (c->isa_level == MIPS_CPU_ISA_M32R1 ||
1203 c->isa_level == MIPS_CPU_ISA_M32R2 ||
1204 c->isa_level == MIPS_CPU_ISA_M64R1 ||
1205 c->isa_level == MIPS_CPU_ISA_M64R2) {
1206 #ifdef CONFIG_MIPS_CPU_SCACHE
1207 if (mips_sc_init ()) {
1208 scache_size = c->scache.ways * c->scache.sets * c->scache.linesz;
1209 printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n",
1210 scache_size >> 10,
1211 way_string[c->scache.ways], c->scache.linesz);
1212 }
1213 #else
1214 if (!(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
1215 panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
1216 #endif
1217 return;
1218 }
1219 sc_present = 0;
1220 }
1221
1222 if (!sc_present)
1223 return;
1224
1225 /* compute a couple of other cache variables */
1226 c->scache.waysize = scache_size / c->scache.ways;
1227
1228 c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1229
1230 printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1231 scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1232
1233 c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1234 }
1235
au1x00_fixup_config_od(void)1236 void au1x00_fixup_config_od(void)
1237 {
1238 /*
1239 * c0_config.od (bit 19) was write only (and read as 0)
1240 * on the early revisions of Alchemy SOCs. It disables the bus
1241 * transaction overlapping and needs to be set to fix various errata.
1242 */
1243 switch (read_c0_prid()) {
1244 case 0x00030100: /* Au1000 DA */
1245 case 0x00030201: /* Au1000 HA */
1246 case 0x00030202: /* Au1000 HB */
1247 case 0x01030200: /* Au1500 AB */
1248 /*
1249 * Au1100 errata actually keeps silence about this bit, so we set it
1250 * just in case for those revisions that require it to be set according
1251 * to the (now gone) cpu table.
1252 */
1253 case 0x02030200: /* Au1100 AB */
1254 case 0x02030201: /* Au1100 BA */
1255 case 0x02030202: /* Au1100 BC */
1256 set_c0_config(1 << 19);
1257 break;
1258 }
1259 }
1260
1261 /* CP0 hazard avoidance. */
1262 #define NXP_BARRIER() \
1263 __asm__ __volatile__( \
1264 ".set noreorder\n\t" \
1265 "nop; nop; nop; nop; nop; nop;\n\t" \
1266 ".set reorder\n\t")
1267
nxp_pr4450_fixup_config(void)1268 static void nxp_pr4450_fixup_config(void)
1269 {
1270 unsigned long config0;
1271
1272 config0 = read_c0_config();
1273
1274 /* clear all three cache coherency fields */
1275 config0 &= ~(0x7 | (7 << 25) | (7 << 28));
1276 config0 |= (((_page_cachable_default >> _CACHE_SHIFT) << 0) |
1277 ((_page_cachable_default >> _CACHE_SHIFT) << 25) |
1278 ((_page_cachable_default >> _CACHE_SHIFT) << 28));
1279 write_c0_config(config0);
1280 NXP_BARRIER();
1281 }
1282
1283 static int __cpuinitdata cca = -1;
1284
cca_setup(char * str)1285 static int __init cca_setup(char *str)
1286 {
1287 get_option(&str, &cca);
1288
1289 return 1;
1290 }
1291
1292 __setup("cca=", cca_setup);
1293
coherency_setup(void)1294 static void __cpuinit coherency_setup(void)
1295 {
1296 if (cca < 0 || cca > 7)
1297 cca = read_c0_config() & CONF_CM_CMASK;
1298 _page_cachable_default = cca << _CACHE_SHIFT;
1299
1300 pr_debug("Using cache attribute %d\n", cca);
1301 change_c0_config(CONF_CM_CMASK, cca);
1302
1303 /*
1304 * c0_status.cu=0 specifies that updates by the sc instruction use
1305 * the coherency mode specified by the TLB; 1 means cachable
1306 * coherent update on write will be used. Not all processors have
1307 * this bit and; some wire it to zero, others like Toshiba had the
1308 * silly idea of putting something else there ...
1309 */
1310 switch (current_cpu_type()) {
1311 case CPU_R4000PC:
1312 case CPU_R4000SC:
1313 case CPU_R4000MC:
1314 case CPU_R4400PC:
1315 case CPU_R4400SC:
1316 case CPU_R4400MC:
1317 clear_c0_config(CONF_CU);
1318 break;
1319 /*
1320 * We need to catch the early Alchemy SOCs with
1321 * the write-only co_config.od bit and set it back to one on:
1322 * Au1000 rev DA, HA, HB; Au1100 AB, BA, BC, Au1500 AB
1323 */
1324 case CPU_ALCHEMY:
1325 au1x00_fixup_config_od();
1326 break;
1327
1328 case PRID_IMP_PR4450:
1329 nxp_pr4450_fixup_config();
1330 break;
1331 }
1332 }
1333
1334 #if defined(CONFIG_DMA_NONCOHERENT)
1335
1336 static int __cpuinitdata coherentio;
1337
setcoherentio(char * str)1338 static int __init setcoherentio(char *str)
1339 {
1340 coherentio = 1;
1341
1342 return 1;
1343 }
1344
1345 __setup("coherentio", setcoherentio);
1346 #endif
1347
r4k_cache_init(void)1348 void __cpuinit r4k_cache_init(void)
1349 {
1350 extern void build_clear_page(void);
1351 extern void build_copy_page(void);
1352 extern char __weak except_vec2_generic;
1353 extern char __weak except_vec2_sb1;
1354 struct cpuinfo_mips *c = ¤t_cpu_data;
1355
1356 switch (c->cputype) {
1357 case CPU_SB1:
1358 case CPU_SB1A:
1359 set_uncached_handler(0x100, &except_vec2_sb1, 0x80);
1360 break;
1361
1362 default:
1363 set_uncached_handler(0x100, &except_vec2_generic, 0x80);
1364 break;
1365 }
1366
1367 probe_pcache();
1368 setup_scache();
1369
1370 r4k_blast_dcache_page_setup();
1371 r4k_blast_dcache_page_indexed_setup();
1372 r4k_blast_dcache_setup();
1373 r4k_blast_icache_page_setup();
1374 r4k_blast_icache_page_indexed_setup();
1375 r4k_blast_icache_setup();
1376 r4k_blast_scache_page_setup();
1377 r4k_blast_scache_page_indexed_setup();
1378 r4k_blast_scache_setup();
1379
1380 /*
1381 * Some MIPS32 and MIPS64 processors have physically indexed caches.
1382 * This code supports virtually indexed processors and will be
1383 * unnecessarily inefficient on physically indexed processors.
1384 */
1385 if (c->dcache.linesz)
1386 shm_align_mask = max_t( unsigned long,
1387 c->dcache.sets * c->dcache.linesz - 1,
1388 PAGE_SIZE - 1);
1389 else
1390 shm_align_mask = PAGE_SIZE-1;
1391
1392 __flush_cache_vmap = r4k__flush_cache_vmap;
1393 __flush_cache_vunmap = r4k__flush_cache_vunmap;
1394
1395 flush_cache_all = cache_noop;
1396 __flush_cache_all = r4k___flush_cache_all;
1397 flush_cache_mm = r4k_flush_cache_mm;
1398 flush_cache_page = r4k_flush_cache_page;
1399 flush_cache_range = r4k_flush_cache_range;
1400
1401 flush_cache_sigtramp = r4k_flush_cache_sigtramp;
1402 flush_icache_all = r4k_flush_icache_all;
1403 local_flush_data_cache_page = local_r4k_flush_data_cache_page;
1404 flush_data_cache_page = r4k_flush_data_cache_page;
1405 flush_icache_range = r4k_flush_icache_range;
1406 local_flush_icache_range = local_r4k_flush_icache_range;
1407
1408 #if defined(CONFIG_DMA_NONCOHERENT)
1409 if (coherentio) {
1410 _dma_cache_wback_inv = (void *)cache_noop;
1411 _dma_cache_wback = (void *)cache_noop;
1412 _dma_cache_inv = (void *)cache_noop;
1413 } else {
1414 _dma_cache_wback_inv = r4k_dma_cache_wback_inv;
1415 _dma_cache_wback = r4k_dma_cache_wback_inv;
1416 _dma_cache_inv = r4k_dma_cache_inv;
1417 }
1418 #endif
1419
1420 build_clear_page();
1421 build_copy_page();
1422 #if !defined(CONFIG_MIPS_CMP)
1423 local_r4k___flush_cache_all(NULL);
1424 #endif
1425 coherency_setup();
1426 }
1427