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Linux 2.6.39-rc2
[pohmelfs.git] / arch / microblaze / kernel / cpu / cache.c
blobcf0afd90a2c06071638cec3a78f315dfb1ee2172
1 /*
2 * Cache control for MicroBlaze cache memories
3 *
4 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
5 * Copyright (C) 2007-2009 PetaLogix
6 * Copyright (C) 2007-2009 John Williams <john.williams@petalogix.com>
7 *
8 * This file is subject to the terms and conditions of the GNU General
9 * Public License. See the file COPYING in the main directory of this
10 * archive for more details.
11 */
12
13 #include <asm/cacheflush.h>
14 #include <linux/cache.h>
15 #include <asm/cpuinfo.h>
16 #include <asm/pvr.h>
17
18 static inline void __enable_icache_msr(void)
19 {
20 __asm__ __volatile__ (" msrset r0, %0; \
21 nop; " \
22 : : "i" (MSR_ICE) : "memory");
23 }
24
25 static inline void __disable_icache_msr(void)
26 {
27 __asm__ __volatile__ (" msrclr r0, %0; \
28 nop; " \
29 : : "i" (MSR_ICE) : "memory");
30 }
31
32 static inline void __enable_dcache_msr(void)
33 {
34 __asm__ __volatile__ (" msrset r0, %0; \
35 nop; " \
36 : \
37 : "i" (MSR_DCE) \
38 : "memory");
39 }
40
41 static inline void __disable_dcache_msr(void)
42 {
43 __asm__ __volatile__ (" msrclr r0, %0; \
44 nop; " \
45 : \
46 : "i" (MSR_DCE) \
47 : "memory");
48 }
49
50 static inline void __enable_icache_nomsr(void)
51 {
52 __asm__ __volatile__ (" mfs r12, rmsr; \
53 nop; \
54 ori r12, r12, %0; \
55 mts rmsr, r12; \
56 nop; " \
57 : \
58 : "i" (MSR_ICE) \
59 : "memory", "r12");
60 }
61
62 static inline void __disable_icache_nomsr(void)
63 {
64 __asm__ __volatile__ (" mfs r12, rmsr; \
65 nop; \
66 andi r12, r12, ~%0; \
67 mts rmsr, r12; \
68 nop; " \
69 : \
70 : "i" (MSR_ICE) \
71 : "memory", "r12");
72 }
73
74 static inline void __enable_dcache_nomsr(void)
75 {
76 __asm__ __volatile__ (" mfs r12, rmsr; \
77 nop; \
78 ori r12, r12, %0; \
79 mts rmsr, r12; \
80 nop; " \
81 : \
82 : "i" (MSR_DCE) \
83 : "memory", "r12");
84 }
85
86 static inline void __disable_dcache_nomsr(void)
87 {
88 __asm__ __volatile__ (" mfs r12, rmsr; \
89 nop; \
90 andi r12, r12, ~%0; \
91 mts rmsr, r12; \
92 nop; " \
93 : \
94 : "i" (MSR_DCE) \
95 : "memory", "r12");
96 }
97
98
99 /* Helper macro for computing the limits of cache range loops
100 *
101 * End address can be unaligned which is OK for C implementation.
102 * ASM implementation align it in ASM macros
103 */
104 #define CACHE_LOOP_LIMITS(start, end, cache_line_length, cache_size) \
105 do { \
106 int align = ~(cache_line_length - 1); \
107 end = min(start + cache_size, end); \
108 start &= align; \
109 } while (0);
110
111 /*
112 * Helper macro to loop over the specified cache_size/line_length and
113 * execute 'op' on that cacheline
114 */
115 #define CACHE_ALL_LOOP(cache_size, line_length, op) \
116 do { \
117 unsigned int len = cache_size - line_length; \
118 int step = -line_length; \
119 WARN_ON(step >= 0); \
120 \
121 __asm__ __volatile__ (" 1: " #op " %0, r0; \
122 bgtid %0, 1b; \
123 addk %0, %0, %1; \
124 " : : "r" (len), "r" (step) \
125 : "memory"); \
126 } while (0);
127
128 /* Used for wdc.flush/clear which can use rB for offset which is not possible
129 * to use for simple wdc or wic.
130 *
131 * start address is cache aligned
132 * end address is not aligned, if end is aligned then I have to substract
133 * cacheline length because I can't flush/invalidate the next cacheline.
134 * If is not, I align it because I will flush/invalidate whole line.
135 */
136 #define CACHE_RANGE_LOOP_2(start, end, line_length, op) \
137 do { \
138 int step = -line_length; \
139 int align = ~(line_length - 1); \
140 int count; \
141 end = ((end & align) == end) ? end - line_length : end & align; \
142 count = end - start; \
143 WARN_ON(count < 0); \
144 \
145 __asm__ __volatile__ (" 1: " #op " %0, %1; \
146 bgtid %1, 1b; \
147 addk %1, %1, %2; \
148 " : : "r" (start), "r" (count), \
149 "r" (step) : "memory"); \
150 } while (0);
151
152 /* It is used only first parameter for OP - for wic, wdc */
153 #define CACHE_RANGE_LOOP_1(start, end, line_length, op) \
154 do { \
155 int volatile temp; \
156 int align = ~(line_length - 1); \
157 end = ((end & align) == end) ? end - line_length : end & align; \
158 WARN_ON(end - start < 0); \
159 \
160 __asm__ __volatile__ (" 1: " #op " %1, r0; \
161 cmpu %0, %1, %2; \
162 bgtid %0, 1b; \
163 addk %1, %1, %3; \
164 " : : "r" (temp), "r" (start), "r" (end),\
165 "r" (line_length) : "memory"); \
166 } while (0);
167
168 #define ASM_LOOP
169
170 static void __flush_icache_range_msr_irq(unsigned long start, unsigned long end)
171 {
172 unsigned long flags;
173 #ifndef ASM_LOOP
174 int i;
175 #endif
176 pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
177 (unsigned int)start, (unsigned int) end);
178
179 CACHE_LOOP_LIMITS(start, end,
180 cpuinfo.icache_line_length, cpuinfo.icache_size);
181
182 local_irq_save(flags);
183 __disable_icache_msr();
184
185 #ifdef ASM_LOOP
186 CACHE_RANGE_LOOP_1(start, end, cpuinfo.icache_line_length, wic);
187 #else
188 for (i = start; i < end; i += cpuinfo.icache_line_length)
189 __asm__ __volatile__ ("wic %0, r0;" \
190 : : "r" (i));
191 #endif
192 __enable_icache_msr();
193 local_irq_restore(flags);
194 }
195
196 static void __flush_icache_range_nomsr_irq(unsigned long start,
197 unsigned long end)
198 {
199 unsigned long flags;
200 #ifndef ASM_LOOP
201 int i;
202 #endif
203 pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
204 (unsigned int)start, (unsigned int) end);
205
206 CACHE_LOOP_LIMITS(start, end,
207 cpuinfo.icache_line_length, cpuinfo.icache_size);
208
209 local_irq_save(flags);
210 __disable_icache_nomsr();
211
212 #ifdef ASM_LOOP
213 CACHE_RANGE_LOOP_1(start, end, cpuinfo.icache_line_length, wic);
214 #else
215 for (i = start; i < end; i += cpuinfo.icache_line_length)
216 __asm__ __volatile__ ("wic %0, r0;" \
217 : : "r" (i));
218 #endif
219
220 __enable_icache_nomsr();
221 local_irq_restore(flags);
222 }
223
224 static void __flush_icache_range_noirq(unsigned long start,
225 unsigned long end)
226 {
227 #ifndef ASM_LOOP
228 int i;
229 #endif
230 pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
231 (unsigned int)start, (unsigned int) end);
232
233 CACHE_LOOP_LIMITS(start, end,
234 cpuinfo.icache_line_length, cpuinfo.icache_size);
235 #ifdef ASM_LOOP
236 CACHE_RANGE_LOOP_1(start, end, cpuinfo.icache_line_length, wic);
237 #else
238 for (i = start; i < end; i += cpuinfo.icache_line_length)
239 __asm__ __volatile__ ("wic %0, r0;" \
240 : : "r" (i));
241 #endif
242 }
243
244 static void __flush_icache_all_msr_irq(void)
245 {
246 unsigned long flags;
247 #ifndef ASM_LOOP
248 int i;
249 #endif
250 pr_debug("%s\n", __func__);
251
252 local_irq_save(flags);
253 __disable_icache_msr();
254 #ifdef ASM_LOOP
255 CACHE_ALL_LOOP(cpuinfo.icache_size, cpuinfo.icache_line_length, wic);
256 #else
257 for (i = 0; i < cpuinfo.icache_size;
258 i += cpuinfo.icache_line_length)
259 __asm__ __volatile__ ("wic %0, r0;" \
260 : : "r" (i));
261 #endif
262 __enable_icache_msr();
263 local_irq_restore(flags);
264 }
265
266 static void __flush_icache_all_nomsr_irq(void)
267 {
268 unsigned long flags;
269 #ifndef ASM_LOOP
270 int i;
271 #endif
272 pr_debug("%s\n", __func__);
273
274 local_irq_save(flags);
275 __disable_icache_nomsr();
276 #ifdef ASM_LOOP
277 CACHE_ALL_LOOP(cpuinfo.icache_size, cpuinfo.icache_line_length, wic);
278 #else
279 for (i = 0; i < cpuinfo.icache_size;
280 i += cpuinfo.icache_line_length)
281 __asm__ __volatile__ ("wic %0, r0;" \
282 : : "r" (i));
283 #endif
284 __enable_icache_nomsr();
285 local_irq_restore(flags);
286 }
287
288 static void __flush_icache_all_noirq(void)
289 {
290 #ifndef ASM_LOOP
291 int i;
292 #endif
293 pr_debug("%s\n", __func__);
294 #ifdef ASM_LOOP
295 CACHE_ALL_LOOP(cpuinfo.icache_size, cpuinfo.icache_line_length, wic);
296 #else
297 for (i = 0; i < cpuinfo.icache_size;
298 i += cpuinfo.icache_line_length)
299 __asm__ __volatile__ ("wic %0, r0;" \
300 : : "r" (i));
301 #endif
302 }
303
304 static void __invalidate_dcache_all_msr_irq(void)
305 {
306 unsigned long flags;
307 #ifndef ASM_LOOP
308 int i;
309 #endif
310 pr_debug("%s\n", __func__);
311
312 local_irq_save(flags);
313 __disable_dcache_msr();
314 #ifdef ASM_LOOP
315 CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length, wdc);
316 #else
317 for (i = 0; i < cpuinfo.dcache_size;
318 i += cpuinfo.dcache_line_length)
319 __asm__ __volatile__ ("wdc %0, r0;" \
320 : : "r" (i));
321 #endif
322 __enable_dcache_msr();
323 local_irq_restore(flags);
324 }
325
326 static void __invalidate_dcache_all_nomsr_irq(void)
327 {
328 unsigned long flags;
329 #ifndef ASM_LOOP
330 int i;
331 #endif
332 pr_debug("%s\n", __func__);
333
334 local_irq_save(flags);
335 __disable_dcache_nomsr();
336 #ifdef ASM_LOOP
337 CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length, wdc);
338 #else
339 for (i = 0; i < cpuinfo.dcache_size;
340 i += cpuinfo.dcache_line_length)
341 __asm__ __volatile__ ("wdc %0, r0;" \
342 : : "r" (i));
343 #endif
344 __enable_dcache_nomsr();
345 local_irq_restore(flags);
346 }
347
348 static void __invalidate_dcache_all_noirq_wt(void)
349 {
350 #ifndef ASM_LOOP
351 int i;
352 #endif
353 pr_debug("%s\n", __func__);
354 #ifdef ASM_LOOP
355 CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length, wdc)
356 #else
357 for (i = 0; i < cpuinfo.dcache_size;
358 i += cpuinfo.dcache_line_length)
359 __asm__ __volatile__ ("wdc %0, r0;" \
360 : : "r" (i));
361 #endif
362 }
363
364 /* FIXME It is blindly invalidation as is expected
365 * but can't be called on noMMU in microblaze_cache_init below
366 *
367 * MS: noMMU kernel won't boot if simple wdc is used
368 * The reason should be that there are discared data which kernel needs
369 */
370 static void __invalidate_dcache_all_wb(void)
371 {
372 #ifndef ASM_LOOP
373 int i;
374 #endif
375 pr_debug("%s\n", __func__);
376 #ifdef ASM_LOOP
377 CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length,
378 wdc)
379 #else
380 for (i = 0; i < cpuinfo.dcache_size;
381 i += cpuinfo.dcache_line_length)
382 __asm__ __volatile__ ("wdc %0, r0;" \
383 : : "r" (i));
384 #endif
385 }
386
387 static void __invalidate_dcache_range_wb(unsigned long start,
388 unsigned long end)
389 {
390 #ifndef ASM_LOOP
391 int i;
392 #endif
393 pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
394 (unsigned int)start, (unsigned int) end);
395
396 CACHE_LOOP_LIMITS(start, end,
397 cpuinfo.dcache_line_length, cpuinfo.dcache_size);
398 #ifdef ASM_LOOP
399 CACHE_RANGE_LOOP_2(start, end, cpuinfo.dcache_line_length, wdc.clear);
400 #else
401 for (i = start; i < end; i += cpuinfo.dcache_line_length)
402 __asm__ __volatile__ ("wdc.clear %0, r0;" \
403 : : "r" (i));
404 #endif
405 }
406
407 static void __invalidate_dcache_range_nomsr_wt(unsigned long start,
408 unsigned long end)
409 {
410 #ifndef ASM_LOOP
411 int i;
412 #endif
413 pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
414 (unsigned int)start, (unsigned int) end);
415 CACHE_LOOP_LIMITS(start, end,
416 cpuinfo.dcache_line_length, cpuinfo.dcache_size);
417
418 #ifdef ASM_LOOP
419 CACHE_RANGE_LOOP_1(start, end, cpuinfo.dcache_line_length, wdc);
420 #else
421 for (i = start; i < end; i += cpuinfo.dcache_line_length)
422 __asm__ __volatile__ ("wdc %0, r0;" \
423 : : "r" (i));
424 #endif
425 }
426
427 static void __invalidate_dcache_range_msr_irq_wt(unsigned long start,
428 unsigned long end)
429 {
430 unsigned long flags;
431 #ifndef ASM_LOOP
432 int i;
433 #endif
434 pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
435 (unsigned int)start, (unsigned int) end);
436 CACHE_LOOP_LIMITS(start, end,
437 cpuinfo.dcache_line_length, cpuinfo.dcache_size);
438
439 local_irq_save(flags);
440 __disable_dcache_msr();
441
442 #ifdef ASM_LOOP
443 CACHE_RANGE_LOOP_1(start, end, cpuinfo.dcache_line_length, wdc);
444 #else
445 for (i = start; i < end; i += cpuinfo.dcache_line_length)
446 __asm__ __volatile__ ("wdc %0, r0;" \
447 : : "r" (i));
448 #endif
449
450 __enable_dcache_msr();
451 local_irq_restore(flags);
452 }
453
454 static void __invalidate_dcache_range_nomsr_irq(unsigned long start,
455 unsigned long end)
456 {
457 unsigned long flags;
458 #ifndef ASM_LOOP
459 int i;
460 #endif
461 pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
462 (unsigned int)start, (unsigned int) end);
463
464 CACHE_LOOP_LIMITS(start, end,
465 cpuinfo.dcache_line_length, cpuinfo.dcache_size);
466
467 local_irq_save(flags);
468 __disable_dcache_nomsr();
469
470 #ifdef ASM_LOOP
471 CACHE_RANGE_LOOP_1(start, end, cpuinfo.dcache_line_length, wdc);
472 #else
473 for (i = start; i < end; i += cpuinfo.dcache_line_length)
474 __asm__ __volatile__ ("wdc %0, r0;" \
475 : : "r" (i));
476 #endif
477
478 __enable_dcache_nomsr();
479 local_irq_restore(flags);
480 }
481
482 static void __flush_dcache_all_wb(void)
483 {
484 #ifndef ASM_LOOP
485 int i;
486 #endif
487 pr_debug("%s\n", __func__);
488 #ifdef ASM_LOOP
489 CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length,
490 wdc.flush);
491 #else
492 for (i = 0; i < cpuinfo.dcache_size;
493 i += cpuinfo.dcache_line_length)
494 __asm__ __volatile__ ("wdc.flush %0, r0;" \
495 : : "r" (i));
496 #endif
497 }
498
499 static void __flush_dcache_range_wb(unsigned long start, unsigned long end)
500 {
501 #ifndef ASM_LOOP
502 int i;
503 #endif
504 pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
505 (unsigned int)start, (unsigned int) end);
506
507 CACHE_LOOP_LIMITS(start, end,
508 cpuinfo.dcache_line_length, cpuinfo.dcache_size);
509 #ifdef ASM_LOOP
510 CACHE_RANGE_LOOP_2(start, end, cpuinfo.dcache_line_length, wdc.flush);
511 #else
512 for (i = start; i < end; i += cpuinfo.dcache_line_length)
513 __asm__ __volatile__ ("wdc.flush %0, r0;" \
514 : : "r" (i));
515 #endif
516 }
517
518 /* struct for wb caches and for wt caches */
519 struct scache *mbc;
520
521 /* new wb cache model */
522 static const struct scache wb_msr = {
523 .ie = __enable_icache_msr,
524 .id = __disable_icache_msr,
525 .ifl = __flush_icache_all_noirq,
526 .iflr = __flush_icache_range_noirq,
527 .iin = __flush_icache_all_noirq,
528 .iinr = __flush_icache_range_noirq,
529 .de = __enable_dcache_msr,
530 .dd = __disable_dcache_msr,
531 .dfl = __flush_dcache_all_wb,
532 .dflr = __flush_dcache_range_wb,
533 .din = __invalidate_dcache_all_wb,
534 .dinr = __invalidate_dcache_range_wb,
535 };
536
537 /* There is only difference in ie, id, de, dd functions */
538 static const struct scache wb_nomsr = {
539 .ie = __enable_icache_nomsr,
540 .id = __disable_icache_nomsr,
541 .ifl = __flush_icache_all_noirq,
542 .iflr = __flush_icache_range_noirq,
543 .iin = __flush_icache_all_noirq,
544 .iinr = __flush_icache_range_noirq,
545 .de = __enable_dcache_nomsr,
546 .dd = __disable_dcache_nomsr,
547 .dfl = __flush_dcache_all_wb,
548 .dflr = __flush_dcache_range_wb,
549 .din = __invalidate_dcache_all_wb,
550 .dinr = __invalidate_dcache_range_wb,
551 };
552
553 /* Old wt cache model with disabling irq and turn off cache */
554 static const struct scache wt_msr = {
555 .ie = __enable_icache_msr,
556 .id = __disable_icache_msr,
557 .ifl = __flush_icache_all_msr_irq,
558 .iflr = __flush_icache_range_msr_irq,
559 .iin = __flush_icache_all_msr_irq,
560 .iinr = __flush_icache_range_msr_irq,
561 .de = __enable_dcache_msr,
562 .dd = __disable_dcache_msr,
563 .dfl = __invalidate_dcache_all_msr_irq,
564 .dflr = __invalidate_dcache_range_msr_irq_wt,
565 .din = __invalidate_dcache_all_msr_irq,
566 .dinr = __invalidate_dcache_range_msr_irq_wt,
567 };
568
569 static const struct scache wt_nomsr = {
570 .ie = __enable_icache_nomsr,
571 .id = __disable_icache_nomsr,
572 .ifl = __flush_icache_all_nomsr_irq,
573 .iflr = __flush_icache_range_nomsr_irq,
574 .iin = __flush_icache_all_nomsr_irq,
575 .iinr = __flush_icache_range_nomsr_irq,
576 .de = __enable_dcache_nomsr,
577 .dd = __disable_dcache_nomsr,
578 .dfl = __invalidate_dcache_all_nomsr_irq,
579 .dflr = __invalidate_dcache_range_nomsr_irq,
580 .din = __invalidate_dcache_all_nomsr_irq,
581 .dinr = __invalidate_dcache_range_nomsr_irq,
582 };
583
584 /* New wt cache model for newer Microblaze versions */
585 static const struct scache wt_msr_noirq = {
586 .ie = __enable_icache_msr,
587 .id = __disable_icache_msr,
588 .ifl = __flush_icache_all_noirq,
589 .iflr = __flush_icache_range_noirq,
590 .iin = __flush_icache_all_noirq,
591 .iinr = __flush_icache_range_noirq,
592 .de = __enable_dcache_msr,
593 .dd = __disable_dcache_msr,
594 .dfl = __invalidate_dcache_all_noirq_wt,
595 .dflr = __invalidate_dcache_range_nomsr_wt,
596 .din = __invalidate_dcache_all_noirq_wt,
597 .dinr = __invalidate_dcache_range_nomsr_wt,
598 };
599
600 static const struct scache wt_nomsr_noirq = {
601 .ie = __enable_icache_nomsr,
602 .id = __disable_icache_nomsr,
603 .ifl = __flush_icache_all_noirq,
604 .iflr = __flush_icache_range_noirq,
605 .iin = __flush_icache_all_noirq,
606 .iinr = __flush_icache_range_noirq,
607 .de = __enable_dcache_nomsr,
608 .dd = __disable_dcache_nomsr,
609 .dfl = __invalidate_dcache_all_noirq_wt,
610 .dflr = __invalidate_dcache_range_nomsr_wt,
611 .din = __invalidate_dcache_all_noirq_wt,
612 .dinr = __invalidate_dcache_range_nomsr_wt,
613 };
614
615 /* CPU version code for 7.20.c - see arch/microblaze/kernel/cpu/cpuinfo.c */
616 #define CPUVER_7_20_A 0x0c
617 #define CPUVER_7_20_D 0x0f
618
619 #define INFO(s) printk(KERN_INFO "cache: " s "\n");
620
621 void microblaze_cache_init(void)
622 {
623 if (cpuinfo.use_instr & PVR2_USE_MSR_INSTR) {
624 if (cpuinfo.dcache_wb) {
625 INFO("wb_msr");
626 mbc = (struct scache *)&wb_msr;
627 if (cpuinfo.ver_code <= CPUVER_7_20_D) {
628 /* MS: problem with signal handling - hw bug */
629 INFO("WB won't work properly");
630 }
631 } else {
632 if (cpuinfo.ver_code >= CPUVER_7_20_A) {
633 INFO("wt_msr_noirq");
634 mbc = (struct scache *)&wt_msr_noirq;
635 } else {
636 INFO("wt_msr");
637 mbc = (struct scache *)&wt_msr;
638 }
639 }
640 } else {
641 if (cpuinfo.dcache_wb) {
642 INFO("wb_nomsr");
643 mbc = (struct scache *)&wb_nomsr;
644 if (cpuinfo.ver_code <= CPUVER_7_20_D) {
645 /* MS: problem with signal handling - hw bug */
646 INFO("WB won't work properly");
647 }
648 } else {
649 if (cpuinfo.ver_code >= CPUVER_7_20_A) {
650 INFO("wt_nomsr_noirq");
651 mbc = (struct scache *)&wt_nomsr_noirq;
652 } else {
653 INFO("wt_nomsr");
654 mbc = (struct scache *)&wt_nomsr;
655 }
656 }
657 }
658 /* FIXME Invalidation is done in U-BOOT
659 * WT cache: Data is already written to main memory
660 * WB cache: Discard data on noMMU which caused that kernel doesn't boot
661 */
662 /* invalidate_dcache(); */
663 enable_dcache();
664
665 invalidate_icache();
666 enable_icache();
667 }