Commit | Line | Data |
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1da177e4 LT |
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 | */ | |
1da177e4 LT |
10 | #include <linux/init.h> |
11 | #include <linux/kernel.h> | |
12 | #include <linux/sched.h> | |
13 | #include <linux/mm.h> | |
14 | #include <linux/bitops.h> | |
15 | ||
16 | #include <asm/bcache.h> | |
17 | #include <asm/bootinfo.h> | |
ec74e361 | 18 | #include <asm/cache.h> |
1da177e4 LT |
19 | #include <asm/cacheops.h> |
20 | #include <asm/cpu.h> | |
21 | #include <asm/cpu-features.h> | |
22 | #include <asm/io.h> | |
23 | #include <asm/page.h> | |
24 | #include <asm/pgtable.h> | |
25 | #include <asm/r4kcache.h> | |
26 | #include <asm/system.h> | |
27 | #include <asm/mmu_context.h> | |
28 | #include <asm/war.h> | |
ba5187db | 29 | #include <asm/cacheflush.h> /* for run_uncached() */ |
1da177e4 | 30 | |
7f3f1d01 RB |
31 | |
32 | /* | |
33 | * Special Variant of smp_call_function for use by cache functions: | |
34 | * | |
35 | * o No return value | |
36 | * o collapses to normal function call on UP kernels | |
37 | * o collapses to normal function call on systems with a single shared | |
38 | * primary cache. | |
39 | */ | |
40 | static inline void r4k_on_each_cpu(void (*func) (void *info), void *info, | |
41 | int retry, int wait) | |
42 | { | |
43 | preempt_disable(); | |
44 | ||
45 | #if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC) | |
46 | smp_call_function(func, info, retry, wait); | |
47 | #endif | |
48 | func(info); | |
49 | preempt_enable(); | |
50 | } | |
51 | ||
ec74e361 RB |
52 | /* |
53 | * Must die. | |
54 | */ | |
55 | static unsigned long icache_size __read_mostly; | |
56 | static unsigned long dcache_size __read_mostly; | |
57 | static unsigned long scache_size __read_mostly; | |
1da177e4 LT |
58 | |
59 | /* | |
60 | * Dummy cache handling routines for machines without boardcaches | |
61 | */ | |
73f40352 | 62 | static void cache_noop(void) {} |
1da177e4 LT |
63 | |
64 | static struct bcache_ops no_sc_ops = { | |
73f40352 CD |
65 | .bc_enable = (void *)cache_noop, |
66 | .bc_disable = (void *)cache_noop, | |
67 | .bc_wback_inv = (void *)cache_noop, | |
68 | .bc_inv = (void *)cache_noop | |
1da177e4 LT |
69 | }; |
70 | ||
71 | struct bcache_ops *bcops = &no_sc_ops; | |
72 | ||
330cfe01 TS |
73 | #define cpu_is_r4600_v1_x() ((read_c0_prid() & 0xfffffff0) == 0x00002010) |
74 | #define cpu_is_r4600_v2_x() ((read_c0_prid() & 0xfffffff0) == 0x00002020) | |
1da177e4 LT |
75 | |
76 | #define R4600_HIT_CACHEOP_WAR_IMPL \ | |
77 | do { \ | |
78 | if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x()) \ | |
79 | *(volatile unsigned long *)CKSEG1; \ | |
80 | if (R4600_V1_HIT_CACHEOP_WAR) \ | |
81 | __asm__ __volatile__("nop;nop;nop;nop"); \ | |
82 | } while (0) | |
83 | ||
84 | static void (*r4k_blast_dcache_page)(unsigned long addr); | |
85 | ||
86 | static inline void r4k_blast_dcache_page_dc32(unsigned long addr) | |
87 | { | |
88 | R4600_HIT_CACHEOP_WAR_IMPL; | |
89 | blast_dcache32_page(addr); | |
90 | } | |
91 | ||
92 | static inline void r4k_blast_dcache_page_setup(void) | |
93 | { | |
94 | unsigned long dc_lsize = cpu_dcache_line_size(); | |
95 | ||
73f40352 CD |
96 | if (dc_lsize == 0) |
97 | r4k_blast_dcache_page = (void *)cache_noop; | |
98 | else if (dc_lsize == 16) | |
1da177e4 LT |
99 | r4k_blast_dcache_page = blast_dcache16_page; |
100 | else if (dc_lsize == 32) | |
101 | r4k_blast_dcache_page = r4k_blast_dcache_page_dc32; | |
102 | } | |
103 | ||
104 | static void (* r4k_blast_dcache_page_indexed)(unsigned long addr); | |
105 | ||
106 | static inline void r4k_blast_dcache_page_indexed_setup(void) | |
107 | { | |
108 | unsigned long dc_lsize = cpu_dcache_line_size(); | |
109 | ||
73f40352 CD |
110 | if (dc_lsize == 0) |
111 | r4k_blast_dcache_page_indexed = (void *)cache_noop; | |
112 | else if (dc_lsize == 16) | |
1da177e4 LT |
113 | r4k_blast_dcache_page_indexed = blast_dcache16_page_indexed; |
114 | else if (dc_lsize == 32) | |
115 | r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed; | |
116 | } | |
117 | ||
118 | static void (* r4k_blast_dcache)(void); | |
119 | ||
120 | static inline void r4k_blast_dcache_setup(void) | |
121 | { | |
122 | unsigned long dc_lsize = cpu_dcache_line_size(); | |
123 | ||
73f40352 CD |
124 | if (dc_lsize == 0) |
125 | r4k_blast_dcache = (void *)cache_noop; | |
126 | else if (dc_lsize == 16) | |
1da177e4 LT |
127 | r4k_blast_dcache = blast_dcache16; |
128 | else if (dc_lsize == 32) | |
129 | r4k_blast_dcache = blast_dcache32; | |
130 | } | |
131 | ||
132 | /* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */ | |
133 | #define JUMP_TO_ALIGN(order) \ | |
134 | __asm__ __volatile__( \ | |
135 | "b\t1f\n\t" \ | |
136 | ".align\t" #order "\n\t" \ | |
137 | "1:\n\t" \ | |
138 | ) | |
139 | #define CACHE32_UNROLL32_ALIGN JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */ | |
140 | #define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11) | |
141 | ||
142 | static inline void blast_r4600_v1_icache32(void) | |
143 | { | |
144 | unsigned long flags; | |
145 | ||
146 | local_irq_save(flags); | |
147 | blast_icache32(); | |
148 | local_irq_restore(flags); | |
149 | } | |
150 | ||
151 | static inline void tx49_blast_icache32(void) | |
152 | { | |
153 | unsigned long start = INDEX_BASE; | |
154 | unsigned long end = start + current_cpu_data.icache.waysize; | |
155 | unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit; | |
156 | unsigned long ws_end = current_cpu_data.icache.ways << | |
157 | current_cpu_data.icache.waybit; | |
158 | unsigned long ws, addr; | |
159 | ||
160 | CACHE32_UNROLL32_ALIGN2; | |
161 | /* I'm in even chunk. blast odd chunks */ | |
42a3b4f2 RB |
162 | for (ws = 0; ws < ws_end; ws += ws_inc) |
163 | for (addr = start + 0x400; addr < end; addr += 0x400 * 2) | |
1da177e4 LT |
164 | cache32_unroll32(addr|ws,Index_Invalidate_I); |
165 | CACHE32_UNROLL32_ALIGN; | |
166 | /* I'm in odd chunk. blast even chunks */ | |
42a3b4f2 RB |
167 | for (ws = 0; ws < ws_end; ws += ws_inc) |
168 | for (addr = start; addr < end; addr += 0x400 * 2) | |
1da177e4 LT |
169 | cache32_unroll32(addr|ws,Index_Invalidate_I); |
170 | } | |
171 | ||
172 | static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page) | |
173 | { | |
174 | unsigned long flags; | |
175 | ||
176 | local_irq_save(flags); | |
177 | blast_icache32_page_indexed(page); | |
178 | local_irq_restore(flags); | |
179 | } | |
180 | ||
181 | static inline void tx49_blast_icache32_page_indexed(unsigned long page) | |
182 | { | |
67a3f6de AN |
183 | unsigned long indexmask = current_cpu_data.icache.waysize - 1; |
184 | unsigned long start = INDEX_BASE + (page & indexmask); | |
1da177e4 LT |
185 | unsigned long end = start + PAGE_SIZE; |
186 | unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit; | |
187 | unsigned long ws_end = current_cpu_data.icache.ways << | |
188 | current_cpu_data.icache.waybit; | |
189 | unsigned long ws, addr; | |
190 | ||
191 | CACHE32_UNROLL32_ALIGN2; | |
192 | /* I'm in even chunk. blast odd chunks */ | |
42a3b4f2 RB |
193 | for (ws = 0; ws < ws_end; ws += ws_inc) |
194 | for (addr = start + 0x400; addr < end; addr += 0x400 * 2) | |
1da177e4 LT |
195 | cache32_unroll32(addr|ws,Index_Invalidate_I); |
196 | CACHE32_UNROLL32_ALIGN; | |
197 | /* I'm in odd chunk. blast even chunks */ | |
42a3b4f2 RB |
198 | for (ws = 0; ws < ws_end; ws += ws_inc) |
199 | for (addr = start; addr < end; addr += 0x400 * 2) | |
1da177e4 LT |
200 | cache32_unroll32(addr|ws,Index_Invalidate_I); |
201 | } | |
202 | ||
203 | static void (* r4k_blast_icache_page)(unsigned long addr); | |
204 | ||
205 | static inline void r4k_blast_icache_page_setup(void) | |
206 | { | |
207 | unsigned long ic_lsize = cpu_icache_line_size(); | |
208 | ||
73f40352 CD |
209 | if (ic_lsize == 0) |
210 | r4k_blast_icache_page = (void *)cache_noop; | |
211 | else if (ic_lsize == 16) | |
1da177e4 LT |
212 | r4k_blast_icache_page = blast_icache16_page; |
213 | else if (ic_lsize == 32) | |
214 | r4k_blast_icache_page = blast_icache32_page; | |
215 | else if (ic_lsize == 64) | |
216 | r4k_blast_icache_page = blast_icache64_page; | |
217 | } | |
218 | ||
219 | ||
220 | static void (* r4k_blast_icache_page_indexed)(unsigned long addr); | |
221 | ||
222 | static inline void r4k_blast_icache_page_indexed_setup(void) | |
223 | { | |
224 | unsigned long ic_lsize = cpu_icache_line_size(); | |
225 | ||
73f40352 CD |
226 | if (ic_lsize == 0) |
227 | r4k_blast_icache_page_indexed = (void *)cache_noop; | |
228 | else if (ic_lsize == 16) | |
1da177e4 LT |
229 | r4k_blast_icache_page_indexed = blast_icache16_page_indexed; |
230 | else if (ic_lsize == 32) { | |
02fe2c9c | 231 | if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x()) |
1da177e4 LT |
232 | r4k_blast_icache_page_indexed = |
233 | blast_icache32_r4600_v1_page_indexed; | |
02fe2c9c TS |
234 | else if (TX49XX_ICACHE_INDEX_INV_WAR) |
235 | r4k_blast_icache_page_indexed = | |
236 | tx49_blast_icache32_page_indexed; | |
1da177e4 LT |
237 | else |
238 | r4k_blast_icache_page_indexed = | |
239 | blast_icache32_page_indexed; | |
240 | } else if (ic_lsize == 64) | |
241 | r4k_blast_icache_page_indexed = blast_icache64_page_indexed; | |
242 | } | |
243 | ||
244 | static void (* r4k_blast_icache)(void); | |
245 | ||
246 | static inline void r4k_blast_icache_setup(void) | |
247 | { | |
248 | unsigned long ic_lsize = cpu_icache_line_size(); | |
249 | ||
73f40352 CD |
250 | if (ic_lsize == 0) |
251 | r4k_blast_icache = (void *)cache_noop; | |
252 | else if (ic_lsize == 16) | |
1da177e4 LT |
253 | r4k_blast_icache = blast_icache16; |
254 | else if (ic_lsize == 32) { | |
255 | if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x()) | |
256 | r4k_blast_icache = blast_r4600_v1_icache32; | |
257 | else if (TX49XX_ICACHE_INDEX_INV_WAR) | |
258 | r4k_blast_icache = tx49_blast_icache32; | |
259 | else | |
260 | r4k_blast_icache = blast_icache32; | |
261 | } else if (ic_lsize == 64) | |
262 | r4k_blast_icache = blast_icache64; | |
263 | } | |
264 | ||
265 | static void (* r4k_blast_scache_page)(unsigned long addr); | |
266 | ||
267 | static inline void r4k_blast_scache_page_setup(void) | |
268 | { | |
269 | unsigned long sc_lsize = cpu_scache_line_size(); | |
270 | ||
4debe4f9 | 271 | if (scache_size == 0) |
73f40352 | 272 | r4k_blast_scache_page = (void *)cache_noop; |
4debe4f9 | 273 | else if (sc_lsize == 16) |
1da177e4 LT |
274 | r4k_blast_scache_page = blast_scache16_page; |
275 | else if (sc_lsize == 32) | |
276 | r4k_blast_scache_page = blast_scache32_page; | |
277 | else if (sc_lsize == 64) | |
278 | r4k_blast_scache_page = blast_scache64_page; | |
279 | else if (sc_lsize == 128) | |
280 | r4k_blast_scache_page = blast_scache128_page; | |
281 | } | |
282 | ||
283 | static void (* r4k_blast_scache_page_indexed)(unsigned long addr); | |
284 | ||
285 | static inline void r4k_blast_scache_page_indexed_setup(void) | |
286 | { | |
287 | unsigned long sc_lsize = cpu_scache_line_size(); | |
288 | ||
4debe4f9 | 289 | if (scache_size == 0) |
73f40352 | 290 | r4k_blast_scache_page_indexed = (void *)cache_noop; |
4debe4f9 | 291 | else if (sc_lsize == 16) |
1da177e4 LT |
292 | r4k_blast_scache_page_indexed = blast_scache16_page_indexed; |
293 | else if (sc_lsize == 32) | |
294 | r4k_blast_scache_page_indexed = blast_scache32_page_indexed; | |
295 | else if (sc_lsize == 64) | |
296 | r4k_blast_scache_page_indexed = blast_scache64_page_indexed; | |
297 | else if (sc_lsize == 128) | |
298 | r4k_blast_scache_page_indexed = blast_scache128_page_indexed; | |
299 | } | |
300 | ||
301 | static void (* r4k_blast_scache)(void); | |
302 | ||
303 | static inline void r4k_blast_scache_setup(void) | |
304 | { | |
305 | unsigned long sc_lsize = cpu_scache_line_size(); | |
306 | ||
4debe4f9 | 307 | if (scache_size == 0) |
73f40352 | 308 | r4k_blast_scache = (void *)cache_noop; |
4debe4f9 | 309 | else if (sc_lsize == 16) |
1da177e4 LT |
310 | r4k_blast_scache = blast_scache16; |
311 | else if (sc_lsize == 32) | |
312 | r4k_blast_scache = blast_scache32; | |
313 | else if (sc_lsize == 64) | |
314 | r4k_blast_scache = blast_scache64; | |
315 | else if (sc_lsize == 128) | |
316 | r4k_blast_scache = blast_scache128; | |
317 | } | |
318 | ||
319 | /* | |
320 | * This is former mm's flush_cache_all() which really should be | |
321 | * flush_cache_vunmap these days ... | |
322 | */ | |
323 | static inline void local_r4k_flush_cache_all(void * args) | |
324 | { | |
325 | r4k_blast_dcache(); | |
326 | r4k_blast_icache(); | |
327 | } | |
328 | ||
329 | static void r4k_flush_cache_all(void) | |
330 | { | |
331 | if (!cpu_has_dc_aliases) | |
332 | return; | |
333 | ||
7f3f1d01 | 334 | r4k_on_each_cpu(local_r4k_flush_cache_all, NULL, 1, 1); |
1da177e4 LT |
335 | } |
336 | ||
337 | static inline void local_r4k___flush_cache_all(void * args) | |
338 | { | |
339 | r4k_blast_dcache(); | |
340 | r4k_blast_icache(); | |
341 | ||
342 | switch (current_cpu_data.cputype) { | |
343 | case CPU_R4000SC: | |
344 | case CPU_R4000MC: | |
345 | case CPU_R4400SC: | |
346 | case CPU_R4400MC: | |
347 | case CPU_R10000: | |
348 | case CPU_R12000: | |
44d921b2 | 349 | case CPU_R14000: |
1da177e4 LT |
350 | r4k_blast_scache(); |
351 | } | |
352 | } | |
353 | ||
354 | static void r4k___flush_cache_all(void) | |
355 | { | |
7f3f1d01 | 356 | r4k_on_each_cpu(local_r4k___flush_cache_all, NULL, 1, 1); |
1da177e4 LT |
357 | } |
358 | ||
359 | static inline void local_r4k_flush_cache_range(void * args) | |
360 | { | |
361 | struct vm_area_struct *vma = args; | |
362 | int exec; | |
363 | ||
364 | if (!(cpu_context(smp_processor_id(), vma->vm_mm))) | |
365 | return; | |
366 | ||
367 | exec = vma->vm_flags & VM_EXEC; | |
368 | if (cpu_has_dc_aliases || exec) | |
369 | r4k_blast_dcache(); | |
370 | if (exec) | |
371 | r4k_blast_icache(); | |
372 | } | |
373 | ||
374 | static void r4k_flush_cache_range(struct vm_area_struct *vma, | |
375 | unsigned long start, unsigned long end) | |
376 | { | |
7f3f1d01 | 377 | r4k_on_each_cpu(local_r4k_flush_cache_range, vma, 1, 1); |
1da177e4 LT |
378 | } |
379 | ||
380 | static inline void local_r4k_flush_cache_mm(void * args) | |
381 | { | |
382 | struct mm_struct *mm = args; | |
383 | ||
384 | if (!cpu_context(smp_processor_id(), mm)) | |
385 | return; | |
386 | ||
387 | r4k_blast_dcache(); | |
388 | r4k_blast_icache(); | |
389 | ||
390 | /* | |
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 | */ | |
394 | if (current_cpu_data.cputype == CPU_R4000SC || | |
395 | current_cpu_data.cputype == CPU_R4000MC || | |
396 | current_cpu_data.cputype == CPU_R4400SC || | |
397 | current_cpu_data.cputype == CPU_R4400MC) | |
398 | r4k_blast_scache(); | |
399 | } | |
400 | ||
401 | static void r4k_flush_cache_mm(struct mm_struct *mm) | |
402 | { | |
403 | if (!cpu_has_dc_aliases) | |
404 | return; | |
405 | ||
7f3f1d01 | 406 | r4k_on_each_cpu(local_r4k_flush_cache_mm, mm, 1, 1); |
1da177e4 LT |
407 | } |
408 | ||
409 | struct flush_cache_page_args { | |
410 | struct vm_area_struct *vma; | |
6ec25809 | 411 | unsigned long addr; |
de62893b | 412 | unsigned long pfn; |
1da177e4 LT |
413 | }; |
414 | ||
415 | static inline void local_r4k_flush_cache_page(void *args) | |
416 | { | |
417 | struct flush_cache_page_args *fcp_args = args; | |
418 | struct vm_area_struct *vma = fcp_args->vma; | |
6ec25809 | 419 | unsigned long addr = fcp_args->addr; |
de62893b | 420 | unsigned long paddr = fcp_args->pfn << PAGE_SHIFT; |
1da177e4 LT |
421 | int exec = vma->vm_flags & VM_EXEC; |
422 | struct mm_struct *mm = vma->vm_mm; | |
423 | pgd_t *pgdp; | |
c6e8b587 | 424 | pud_t *pudp; |
1da177e4 LT |
425 | pmd_t *pmdp; |
426 | pte_t *ptep; | |
427 | ||
79acf83e RB |
428 | /* |
429 | * If ownes no valid ASID yet, cannot possibly have gotten | |
430 | * this page into the cache. | |
431 | */ | |
26a51b27 | 432 | if (cpu_context(smp_processor_id(), mm) == 0) |
79acf83e RB |
433 | return; |
434 | ||
6ec25809 RB |
435 | addr &= PAGE_MASK; |
436 | pgdp = pgd_offset(mm, addr); | |
437 | pudp = pud_offset(pgdp, addr); | |
438 | pmdp = pmd_offset(pudp, addr); | |
439 | ptep = pte_offset(pmdp, addr); | |
1da177e4 LT |
440 | |
441 | /* | |
442 | * If the page isn't marked valid, the page cannot possibly be | |
443 | * in the cache. | |
444 | */ | |
445 | if (!(pte_val(*ptep) & _PAGE_PRESENT)) | |
446 | return; | |
447 | ||
448 | /* | |
449 | * Doing flushes for another ASID than the current one is | |
450 | * too difficult since stupid R4k caches do a TLB translation | |
451 | * for every cache flush operation. So we do indexed flushes | |
452 | * in that case, which doesn't overly flush the cache too much. | |
453 | */ | |
454 | if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) { | |
455 | if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) { | |
6ec25809 | 456 | r4k_blast_dcache_page(addr); |
1da177e4 | 457 | if (exec && !cpu_icache_snoops_remote_store) |
6ec25809 | 458 | r4k_blast_scache_page(addr); |
1da177e4 LT |
459 | } |
460 | if (exec) | |
6ec25809 | 461 | r4k_blast_icache_page(addr); |
1da177e4 LT |
462 | |
463 | return; | |
464 | } | |
465 | ||
466 | /* | |
467 | * Do indexed flush, too much work to get the (possible) TLB refills | |
468 | * to work correctly. | |
469 | */ | |
1da177e4 | 470 | if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) { |
de62893b AN |
471 | r4k_blast_dcache_page_indexed(cpu_has_pindexed_dcache ? |
472 | paddr : addr); | |
473 | if (exec && !cpu_icache_snoops_remote_store) { | |
474 | r4k_blast_scache_page_indexed(paddr); | |
475 | } | |
1da177e4 LT |
476 | } |
477 | if (exec) { | |
478 | if (cpu_has_vtag_icache) { | |
479 | int cpu = smp_processor_id(); | |
480 | ||
26a51b27 TS |
481 | if (cpu_context(cpu, mm) != 0) |
482 | drop_mmu_context(mm, cpu); | |
1da177e4 | 483 | } else |
6ec25809 | 484 | r4k_blast_icache_page_indexed(addr); |
1da177e4 LT |
485 | } |
486 | } | |
487 | ||
6ec25809 RB |
488 | static void r4k_flush_cache_page(struct vm_area_struct *vma, |
489 | unsigned long addr, unsigned long pfn) | |
1da177e4 LT |
490 | { |
491 | struct flush_cache_page_args args; | |
492 | ||
1da177e4 | 493 | args.vma = vma; |
6ec25809 | 494 | args.addr = addr; |
de62893b | 495 | args.pfn = pfn; |
1da177e4 | 496 | |
7f3f1d01 | 497 | r4k_on_each_cpu(local_r4k_flush_cache_page, &args, 1, 1); |
1da177e4 LT |
498 | } |
499 | ||
500 | static inline void local_r4k_flush_data_cache_page(void * addr) | |
501 | { | |
502 | r4k_blast_dcache_page((unsigned long) addr); | |
503 | } | |
504 | ||
505 | static void r4k_flush_data_cache_page(unsigned long addr) | |
506 | { | |
7f3f1d01 | 507 | r4k_on_each_cpu(local_r4k_flush_data_cache_page, (void *) addr, 1, 1); |
1da177e4 LT |
508 | } |
509 | ||
510 | struct flush_icache_range_args { | |
d4264f18 AN |
511 | unsigned long start; |
512 | unsigned long end; | |
1da177e4 LT |
513 | }; |
514 | ||
515 | static inline void local_r4k_flush_icache_range(void *args) | |
516 | { | |
517 | struct flush_icache_range_args *fir_args = args; | |
1da177e4 LT |
518 | unsigned long start = fir_args->start; |
519 | unsigned long end = fir_args->end; | |
1da177e4 LT |
520 | |
521 | if (!cpu_has_ic_fills_f_dc) { | |
73f40352 | 522 | if (end - start >= dcache_size) { |
1da177e4 LT |
523 | r4k_blast_dcache(); |
524 | } else { | |
10a3dabd | 525 | R4600_HIT_CACHEOP_WAR_IMPL; |
41700e73 | 526 | protected_blast_dcache_range(start, end); |
1da177e4 LT |
527 | } |
528 | ||
4debe4f9 | 529 | if (!cpu_icache_snoops_remote_store && scache_size) { |
41700e73 | 530 | if (end - start > scache_size) |
1da177e4 | 531 | r4k_blast_scache(); |
41700e73 AN |
532 | else |
533 | protected_blast_scache_range(start, end); | |
1da177e4 LT |
534 | } |
535 | } | |
536 | ||
537 | if (end - start > icache_size) | |
538 | r4k_blast_icache(); | |
41700e73 AN |
539 | else |
540 | protected_blast_icache_range(start, end); | |
1da177e4 LT |
541 | } |
542 | ||
d4264f18 | 543 | static void r4k_flush_icache_range(unsigned long start, unsigned long end) |
1da177e4 LT |
544 | { |
545 | struct flush_icache_range_args args; | |
546 | ||
547 | args.start = start; | |
548 | args.end = end; | |
549 | ||
7f3f1d01 | 550 | r4k_on_each_cpu(local_r4k_flush_icache_range, &args, 1, 1); |
cc61c1fe | 551 | instruction_hazard(); |
1da177e4 LT |
552 | } |
553 | ||
554 | /* | |
555 | * Ok, this seriously sucks. We use them to flush a user page but don't | |
556 | * know the virtual address, so we have to blast away the whole icache | |
557 | * which is significantly more expensive than the real thing. Otoh we at | |
558 | * least know the kernel address of the page so we can flush it | |
559 | * selectivly. | |
560 | */ | |
561 | ||
562 | struct flush_icache_page_args { | |
563 | struct vm_area_struct *vma; | |
564 | struct page *page; | |
565 | }; | |
566 | ||
567 | static inline void local_r4k_flush_icache_page(void *args) | |
568 | { | |
569 | struct flush_icache_page_args *fip_args = args; | |
570 | struct vm_area_struct *vma = fip_args->vma; | |
571 | struct page *page = fip_args->page; | |
572 | ||
573 | /* | |
574 | * Tricky ... Because we don't know the virtual address we've got the | |
575 | * choice of either invalidating the entire primary and secondary | |
576 | * caches or invalidating the secondary caches also. With the subset | |
577 | * enforcment on R4000SC, R4400SC, R10000 and R12000 invalidating the | |
578 | * secondary cache will result in any entries in the primary caches | |
579 | * also getting invalidated which hopefully is a bit more economical. | |
580 | */ | |
fc5d2d27 | 581 | if (cpu_has_inclusive_pcaches) { |
1da177e4 LT |
582 | unsigned long addr = (unsigned long) page_address(page); |
583 | ||
584 | r4k_blast_scache_page(addr); | |
585 | ClearPageDcacheDirty(page); | |
586 | ||
587 | return; | |
588 | } | |
589 | ||
590 | if (!cpu_has_ic_fills_f_dc) { | |
591 | unsigned long addr = (unsigned long) page_address(page); | |
592 | r4k_blast_dcache_page(addr); | |
593 | if (!cpu_icache_snoops_remote_store) | |
594 | r4k_blast_scache_page(addr); | |
595 | ClearPageDcacheDirty(page); | |
596 | } | |
597 | ||
598 | /* | |
599 | * We're not sure of the virtual address(es) involved here, so | |
600 | * we have to flush the entire I-cache. | |
601 | */ | |
602 | if (cpu_has_vtag_icache) { | |
603 | int cpu = smp_processor_id(); | |
604 | ||
605 | if (cpu_context(cpu, vma->vm_mm) != 0) | |
606 | drop_mmu_context(vma->vm_mm, cpu); | |
607 | } else | |
608 | r4k_blast_icache(); | |
609 | } | |
610 | ||
611 | static void r4k_flush_icache_page(struct vm_area_struct *vma, | |
612 | struct page *page) | |
613 | { | |
614 | struct flush_icache_page_args args; | |
615 | ||
616 | /* | |
617 | * If there's no context yet, or the page isn't executable, no I-cache | |
618 | * flush is needed. | |
619 | */ | |
620 | if (!(vma->vm_flags & VM_EXEC)) | |
621 | return; | |
622 | ||
623 | args.vma = vma; | |
624 | args.page = page; | |
625 | ||
7f3f1d01 | 626 | r4k_on_each_cpu(local_r4k_flush_icache_page, &args, 1, 1); |
1da177e4 LT |
627 | } |
628 | ||
629 | ||
630 | #ifdef CONFIG_DMA_NONCOHERENT | |
631 | ||
632 | static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size) | |
633 | { | |
1da177e4 LT |
634 | /* Catch bad driver code */ |
635 | BUG_ON(size == 0); | |
636 | ||
fc5d2d27 | 637 | if (cpu_has_inclusive_pcaches) { |
41700e73 | 638 | if (size >= scache_size) |
1da177e4 | 639 | r4k_blast_scache(); |
41700e73 AN |
640 | else |
641 | blast_scache_range(addr, addr + size); | |
1da177e4 LT |
642 | return; |
643 | } | |
644 | ||
645 | /* | |
646 | * Either no secondary cache or the available caches don't have the | |
647 | * subset property so we have to flush the primary caches | |
648 | * explicitly | |
649 | */ | |
650 | if (size >= dcache_size) { | |
651 | r4k_blast_dcache(); | |
652 | } else { | |
1da177e4 | 653 | R4600_HIT_CACHEOP_WAR_IMPL; |
41700e73 | 654 | blast_dcache_range(addr, addr + size); |
1da177e4 LT |
655 | } |
656 | ||
657 | bc_wback_inv(addr, size); | |
658 | } | |
659 | ||
660 | static void r4k_dma_cache_inv(unsigned long addr, unsigned long size) | |
661 | { | |
1da177e4 LT |
662 | /* Catch bad driver code */ |
663 | BUG_ON(size == 0); | |
664 | ||
fc5d2d27 | 665 | if (cpu_has_inclusive_pcaches) { |
41700e73 | 666 | if (size >= scache_size) |
1da177e4 | 667 | r4k_blast_scache(); |
41700e73 AN |
668 | else |
669 | blast_scache_range(addr, addr + size); | |
1da177e4 LT |
670 | return; |
671 | } | |
672 | ||
673 | if (size >= dcache_size) { | |
674 | r4k_blast_dcache(); | |
675 | } else { | |
1da177e4 | 676 | R4600_HIT_CACHEOP_WAR_IMPL; |
41700e73 | 677 | blast_dcache_range(addr, addr + size); |
1da177e4 LT |
678 | } |
679 | ||
680 | bc_inv(addr, size); | |
681 | } | |
682 | #endif /* CONFIG_DMA_NONCOHERENT */ | |
683 | ||
684 | /* | |
685 | * While we're protected against bad userland addresses we don't care | |
686 | * very much about what happens in that case. Usually a segmentation | |
687 | * fault will dump the process later on anyway ... | |
688 | */ | |
689 | static void local_r4k_flush_cache_sigtramp(void * arg) | |
690 | { | |
02fe2c9c TS |
691 | unsigned long ic_lsize = cpu_icache_line_size(); |
692 | unsigned long dc_lsize = cpu_dcache_line_size(); | |
693 | unsigned long sc_lsize = cpu_scache_line_size(); | |
1da177e4 LT |
694 | unsigned long addr = (unsigned long) arg; |
695 | ||
696 | R4600_HIT_CACHEOP_WAR_IMPL; | |
73f40352 CD |
697 | if (dc_lsize) |
698 | protected_writeback_dcache_line(addr & ~(dc_lsize - 1)); | |
4debe4f9 | 699 | if (!cpu_icache_snoops_remote_store && scache_size) |
1da177e4 | 700 | protected_writeback_scache_line(addr & ~(sc_lsize - 1)); |
73f40352 CD |
701 | if (ic_lsize) |
702 | protected_flush_icache_line(addr & ~(ic_lsize - 1)); | |
1da177e4 LT |
703 | if (MIPS4K_ICACHE_REFILL_WAR) { |
704 | __asm__ __volatile__ ( | |
705 | ".set push\n\t" | |
706 | ".set noat\n\t" | |
707 | ".set mips3\n\t" | |
875d43e7 | 708 | #ifdef CONFIG_32BIT |
1da177e4 LT |
709 | "la $at,1f\n\t" |
710 | #endif | |
875d43e7 | 711 | #ifdef CONFIG_64BIT |
1da177e4 LT |
712 | "dla $at,1f\n\t" |
713 | #endif | |
714 | "cache %0,($at)\n\t" | |
715 | "nop; nop; nop\n" | |
716 | "1:\n\t" | |
717 | ".set pop" | |
718 | : | |
719 | : "i" (Hit_Invalidate_I)); | |
720 | } | |
721 | if (MIPS_CACHE_SYNC_WAR) | |
722 | __asm__ __volatile__ ("sync"); | |
723 | } | |
724 | ||
725 | static void r4k_flush_cache_sigtramp(unsigned long addr) | |
726 | { | |
7f3f1d01 | 727 | r4k_on_each_cpu(local_r4k_flush_cache_sigtramp, (void *) addr, 1, 1); |
1da177e4 LT |
728 | } |
729 | ||
730 | static void r4k_flush_icache_all(void) | |
731 | { | |
732 | if (cpu_has_vtag_icache) | |
733 | r4k_blast_icache(); | |
734 | } | |
735 | ||
736 | static inline void rm7k_erratum31(void) | |
737 | { | |
738 | const unsigned long ic_lsize = 32; | |
739 | unsigned long addr; | |
740 | ||
741 | /* RM7000 erratum #31. The icache is screwed at startup. */ | |
742 | write_c0_taglo(0); | |
743 | write_c0_taghi(0); | |
744 | ||
745 | for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) { | |
746 | __asm__ __volatile__ ( | |
d8748a3a | 747 | ".set push\n\t" |
1da177e4 LT |
748 | ".set noreorder\n\t" |
749 | ".set mips3\n\t" | |
750 | "cache\t%1, 0(%0)\n\t" | |
751 | "cache\t%1, 0x1000(%0)\n\t" | |
752 | "cache\t%1, 0x2000(%0)\n\t" | |
753 | "cache\t%1, 0x3000(%0)\n\t" | |
754 | "cache\t%2, 0(%0)\n\t" | |
755 | "cache\t%2, 0x1000(%0)\n\t" | |
756 | "cache\t%2, 0x2000(%0)\n\t" | |
757 | "cache\t%2, 0x3000(%0)\n\t" | |
758 | "cache\t%1, 0(%0)\n\t" | |
759 | "cache\t%1, 0x1000(%0)\n\t" | |
760 | "cache\t%1, 0x2000(%0)\n\t" | |
761 | "cache\t%1, 0x3000(%0)\n\t" | |
d8748a3a | 762 | ".set pop\n" |
1da177e4 LT |
763 | : |
764 | : "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill)); | |
765 | } | |
766 | } | |
767 | ||
768 | static char *way_string[] __initdata = { NULL, "direct mapped", "2-way", | |
769 | "3-way", "4-way", "5-way", "6-way", "7-way", "8-way" | |
770 | }; | |
771 | ||
772 | static void __init probe_pcache(void) | |
773 | { | |
774 | struct cpuinfo_mips *c = ¤t_cpu_data; | |
775 | unsigned int config = read_c0_config(); | |
776 | unsigned int prid = read_c0_prid(); | |
777 | unsigned long config1; | |
778 | unsigned int lsize; | |
779 | ||
780 | switch (c->cputype) { | |
781 | case CPU_R4600: /* QED style two way caches? */ | |
782 | case CPU_R4700: | |
783 | case CPU_R5000: | |
784 | case CPU_NEVADA: | |
785 | icache_size = 1 << (12 + ((config & CONF_IC) >> 9)); | |
786 | c->icache.linesz = 16 << ((config & CONF_IB) >> 5); | |
787 | c->icache.ways = 2; | |
3c68da79 | 788 | c->icache.waybit = __ffs(icache_size/2); |
1da177e4 LT |
789 | |
790 | dcache_size = 1 << (12 + ((config & CONF_DC) >> 6)); | |
791 | c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); | |
792 | c->dcache.ways = 2; | |
3c68da79 | 793 | c->dcache.waybit= __ffs(dcache_size/2); |
1da177e4 LT |
794 | |
795 | c->options |= MIPS_CPU_CACHE_CDEX_P; | |
796 | break; | |
797 | ||
798 | case CPU_R5432: | |
799 | case CPU_R5500: | |
800 | icache_size = 1 << (12 + ((config & CONF_IC) >> 9)); | |
801 | c->icache.linesz = 16 << ((config & CONF_IB) >> 5); | |
802 | c->icache.ways = 2; | |
803 | c->icache.waybit= 0; | |
804 | ||
805 | dcache_size = 1 << (12 + ((config & CONF_DC) >> 6)); | |
806 | c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); | |
807 | c->dcache.ways = 2; | |
808 | c->dcache.waybit = 0; | |
809 | ||
810 | c->options |= MIPS_CPU_CACHE_CDEX_P; | |
811 | break; | |
812 | ||
813 | case CPU_TX49XX: | |
814 | icache_size = 1 << (12 + ((config & CONF_IC) >> 9)); | |
815 | c->icache.linesz = 16 << ((config & CONF_IB) >> 5); | |
816 | c->icache.ways = 4; | |
817 | c->icache.waybit= 0; | |
818 | ||
819 | dcache_size = 1 << (12 + ((config & CONF_DC) >> 6)); | |
820 | c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); | |
821 | c->dcache.ways = 4; | |
822 | c->dcache.waybit = 0; | |
823 | ||
824 | c->options |= MIPS_CPU_CACHE_CDEX_P; | |
de862b48 | 825 | c->options |= MIPS_CPU_PREFETCH; |
1da177e4 LT |
826 | break; |
827 | ||
828 | case CPU_R4000PC: | |
829 | case CPU_R4000SC: | |
830 | case CPU_R4000MC: | |
831 | case CPU_R4400PC: | |
832 | case CPU_R4400SC: | |
833 | case CPU_R4400MC: | |
834 | case CPU_R4300: | |
835 | icache_size = 1 << (12 + ((config & CONF_IC) >> 9)); | |
836 | c->icache.linesz = 16 << ((config & CONF_IB) >> 5); | |
837 | c->icache.ways = 1; | |
838 | c->icache.waybit = 0; /* doesn't matter */ | |
839 | ||
840 | dcache_size = 1 << (12 + ((config & CONF_DC) >> 6)); | |
841 | c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); | |
842 | c->dcache.ways = 1; | |
843 | c->dcache.waybit = 0; /* does not matter */ | |
844 | ||
845 | c->options |= MIPS_CPU_CACHE_CDEX_P; | |
846 | break; | |
847 | ||
848 | case CPU_R10000: | |
849 | case CPU_R12000: | |
44d921b2 | 850 | case CPU_R14000: |
1da177e4 LT |
851 | icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29)); |
852 | c->icache.linesz = 64; | |
853 | c->icache.ways = 2; | |
854 | c->icache.waybit = 0; | |
855 | ||
856 | dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26)); | |
857 | c->dcache.linesz = 32; | |
858 | c->dcache.ways = 2; | |
859 | c->dcache.waybit = 0; | |
860 | ||
861 | c->options |= MIPS_CPU_PREFETCH; | |
862 | break; | |
863 | ||
864 | case CPU_VR4133: | |
2874fe55 | 865 | write_c0_config(config & ~VR41_CONF_P4K); |
1da177e4 LT |
866 | case CPU_VR4131: |
867 | /* Workaround for cache instruction bug of VR4131 */ | |
868 | if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U || | |
869 | c->processor_id == 0x0c82U) { | |
4e8ab361 YY |
870 | config |= 0x00400000U; |
871 | if (c->processor_id == 0x0c80U) | |
872 | config |= VR41_CONF_BP; | |
1da177e4 | 873 | write_c0_config(config); |
1058ecda YY |
874 | } else |
875 | c->options |= MIPS_CPU_CACHE_CDEX_P; | |
876 | ||
1da177e4 LT |
877 | icache_size = 1 << (10 + ((config & CONF_IC) >> 9)); |
878 | c->icache.linesz = 16 << ((config & CONF_IB) >> 5); | |
879 | c->icache.ways = 2; | |
3c68da79 | 880 | c->icache.waybit = __ffs(icache_size/2); |
1da177e4 LT |
881 | |
882 | dcache_size = 1 << (10 + ((config & CONF_DC) >> 6)); | |
883 | c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); | |
884 | c->dcache.ways = 2; | |
3c68da79 | 885 | c->dcache.waybit = __ffs(dcache_size/2); |
1da177e4 LT |
886 | break; |
887 | ||
888 | case CPU_VR41XX: | |
889 | case CPU_VR4111: | |
890 | case CPU_VR4121: | |
891 | case CPU_VR4122: | |
892 | case CPU_VR4181: | |
893 | case CPU_VR4181A: | |
894 | icache_size = 1 << (10 + ((config & CONF_IC) >> 9)); | |
895 | c->icache.linesz = 16 << ((config & CONF_IB) >> 5); | |
896 | c->icache.ways = 1; | |
897 | c->icache.waybit = 0; /* doesn't matter */ | |
898 | ||
899 | dcache_size = 1 << (10 + ((config & CONF_DC) >> 6)); | |
900 | c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); | |
901 | c->dcache.ways = 1; | |
902 | c->dcache.waybit = 0; /* does not matter */ | |
903 | ||
904 | c->options |= MIPS_CPU_CACHE_CDEX_P; | |
905 | break; | |
906 | ||
907 | case CPU_RM7000: | |
908 | rm7k_erratum31(); | |
909 | ||
910 | case CPU_RM9000: | |
911 | icache_size = 1 << (12 + ((config & CONF_IC) >> 9)); | |
912 | c->icache.linesz = 16 << ((config & CONF_IB) >> 5); | |
913 | c->icache.ways = 4; | |
3c68da79 | 914 | c->icache.waybit = __ffs(icache_size / c->icache.ways); |
1da177e4 LT |
915 | |
916 | dcache_size = 1 << (12 + ((config & CONF_DC) >> 6)); | |
917 | c->dcache.linesz = 16 << ((config & CONF_DB) >> 4); | |
918 | c->dcache.ways = 4; | |
3c68da79 | 919 | c->dcache.waybit = __ffs(dcache_size / c->dcache.ways); |
1da177e4 LT |
920 | |
921 | #if !defined(CONFIG_SMP) || !defined(RM9000_CDEX_SMP_WAR) | |
922 | c->options |= MIPS_CPU_CACHE_CDEX_P; | |
923 | #endif | |
924 | c->options |= MIPS_CPU_PREFETCH; | |
925 | break; | |
926 | ||
927 | default: | |
928 | if (!(config & MIPS_CONF_M)) | |
929 | panic("Don't know how to probe P-caches on this cpu."); | |
930 | ||
931 | /* | |
932 | * So we seem to be a MIPS32 or MIPS64 CPU | |
933 | * So let's probe the I-cache ... | |
934 | */ | |
935 | config1 = read_c0_config1(); | |
936 | ||
937 | if ((lsize = ((config1 >> 19) & 7))) | |
938 | c->icache.linesz = 2 << lsize; | |
939 | else | |
940 | c->icache.linesz = lsize; | |
941 | c->icache.sets = 64 << ((config1 >> 22) & 7); | |
942 | c->icache.ways = 1 + ((config1 >> 16) & 7); | |
943 | ||
944 | icache_size = c->icache.sets * | |
945 | c->icache.ways * | |
946 | c->icache.linesz; | |
3c68da79 | 947 | c->icache.waybit = __ffs(icache_size/c->icache.ways); |
1da177e4 LT |
948 | |
949 | if (config & 0x8) /* VI bit */ | |
950 | c->icache.flags |= MIPS_CACHE_VTAG; | |
951 | ||
952 | /* | |
953 | * Now probe the MIPS32 / MIPS64 data cache. | |
954 | */ | |
955 | c->dcache.flags = 0; | |
956 | ||
957 | if ((lsize = ((config1 >> 10) & 7))) | |
958 | c->dcache.linesz = 2 << lsize; | |
959 | else | |
960 | c->dcache.linesz= lsize; | |
961 | c->dcache.sets = 64 << ((config1 >> 13) & 7); | |
962 | c->dcache.ways = 1 + ((config1 >> 7) & 7); | |
963 | ||
964 | dcache_size = c->dcache.sets * | |
965 | c->dcache.ways * | |
966 | c->dcache.linesz; | |
3c68da79 | 967 | c->dcache.waybit = __ffs(dcache_size/c->dcache.ways); |
1da177e4 LT |
968 | |
969 | c->options |= MIPS_CPU_PREFETCH; | |
970 | break; | |
971 | } | |
972 | ||
973 | /* | |
974 | * Processor configuration sanity check for the R4000SC erratum | |
975 | * #5. With page sizes larger than 32kB there is no possibility | |
976 | * to get a VCE exception anymore so we don't care about this | |
977 | * misconfiguration. The case is rather theoretical anyway; | |
978 | * presumably no vendor is shipping his hardware in the "bad" | |
979 | * configuration. | |
980 | */ | |
981 | if ((prid & 0xff00) == PRID_IMP_R4000 && (prid & 0xff) < 0x40 && | |
982 | !(config & CONF_SC) && c->icache.linesz != 16 && | |
983 | PAGE_SIZE <= 0x8000) | |
984 | panic("Improper R4000SC processor configuration detected"); | |
985 | ||
986 | /* compute a couple of other cache variables */ | |
987 | c->icache.waysize = icache_size / c->icache.ways; | |
988 | c->dcache.waysize = dcache_size / c->dcache.ways; | |
989 | ||
73f40352 CD |
990 | c->icache.sets = c->icache.linesz ? |
991 | icache_size / (c->icache.linesz * c->icache.ways) : 0; | |
992 | c->dcache.sets = c->dcache.linesz ? | |
993 | dcache_size / (c->dcache.linesz * c->dcache.ways) : 0; | |
1da177e4 LT |
994 | |
995 | /* | |
996 | * R10000 and R12000 P-caches are odd in a positive way. They're 32kB | |
997 | * 2-way virtually indexed so normally would suffer from aliases. So | |
998 | * normally they'd suffer from aliases but magic in the hardware deals | |
999 | * with that for us so we don't need to take care ourselves. | |
1000 | */ | |
d1e344e5 | 1001 | switch (c->cputype) { |
a95970f3 | 1002 | case CPU_20KC: |
505403b6 | 1003 | case CPU_25KF: |
de62893b | 1004 | c->dcache.flags |= MIPS_CACHE_PINDEX; |
d1e344e5 RB |
1005 | case CPU_R10000: |
1006 | case CPU_R12000: | |
44d921b2 | 1007 | case CPU_R14000: |
a95970f3 | 1008 | case CPU_SB1: |
d1e344e5 RB |
1009 | break; |
1010 | case CPU_24K: | |
98a41de9 | 1011 | case CPU_34K: |
2e78ae3f | 1012 | case CPU_74K: |
beab375a RB |
1013 | if ((read_c0_config7() & (1 << 16))) { |
1014 | /* effectively physically indexed dcache, | |
1015 | thus no virtual aliases. */ | |
1016 | c->dcache.flags |= MIPS_CACHE_PINDEX; | |
1017 | break; | |
1018 | } | |
d1e344e5 | 1019 | default: |
beab375a RB |
1020 | if (c->dcache.waysize > PAGE_SIZE) |
1021 | c->dcache.flags |= MIPS_CACHE_ALIASES; | |
d1e344e5 | 1022 | } |
1da177e4 LT |
1023 | |
1024 | switch (c->cputype) { | |
1025 | case CPU_20KC: | |
1026 | /* | |
1027 | * Some older 20Kc chips doesn't have the 'VI' bit in | |
1028 | * the config register. | |
1029 | */ | |
1030 | c->icache.flags |= MIPS_CACHE_VTAG; | |
1031 | break; | |
1032 | ||
e3ad1c23 | 1033 | case CPU_AU1000: |
1da177e4 | 1034 | case CPU_AU1500: |
e3ad1c23 PP |
1035 | case CPU_AU1100: |
1036 | case CPU_AU1550: | |
1037 | case CPU_AU1200: | |
1da177e4 LT |
1038 | c->icache.flags |= MIPS_CACHE_IC_F_DC; |
1039 | break; | |
1040 | } | |
1041 | ||
1042 | printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n", | |
1043 | icache_size >> 10, | |
1044 | cpu_has_vtag_icache ? "virtually tagged" : "physically tagged", | |
1045 | way_string[c->icache.ways], c->icache.linesz); | |
1046 | ||
1047 | printk("Primary data cache %ldkB, %s, linesize %d bytes.\n", | |
1048 | dcache_size >> 10, way_string[c->dcache.ways], c->dcache.linesz); | |
1049 | } | |
1050 | ||
1051 | /* | |
1052 | * If you even _breathe_ on this function, look at the gcc output and make sure | |
1053 | * it does not pop things on and off the stack for the cache sizing loop that | |
1054 | * executes in KSEG1 space or else you will crash and burn badly. You have | |
1055 | * been warned. | |
1056 | */ | |
1057 | static int __init probe_scache(void) | |
1058 | { | |
1059 | extern unsigned long stext; | |
1060 | unsigned long flags, addr, begin, end, pow2; | |
1061 | unsigned int config = read_c0_config(); | |
1062 | struct cpuinfo_mips *c = ¤t_cpu_data; | |
1063 | int tmp; | |
1064 | ||
1065 | if (config & CONF_SC) | |
1066 | return 0; | |
1067 | ||
1068 | begin = (unsigned long) &stext; | |
1069 | begin &= ~((4 * 1024 * 1024) - 1); | |
1070 | end = begin + (4 * 1024 * 1024); | |
1071 | ||
1072 | /* | |
1073 | * This is such a bitch, you'd think they would make it easy to do | |
1074 | * this. Away you daemons of stupidity! | |
1075 | */ | |
1076 | local_irq_save(flags); | |
1077 | ||
1078 | /* Fill each size-multiple cache line with a valid tag. */ | |
1079 | pow2 = (64 * 1024); | |
1080 | for (addr = begin; addr < end; addr = (begin + pow2)) { | |
1081 | unsigned long *p = (unsigned long *) addr; | |
1082 | __asm__ __volatile__("nop" : : "r" (*p)); /* whee... */ | |
1083 | pow2 <<= 1; | |
1084 | } | |
1085 | ||
1086 | /* Load first line with zero (therefore invalid) tag. */ | |
1087 | write_c0_taglo(0); | |
1088 | write_c0_taghi(0); | |
1089 | __asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */ | |
1090 | cache_op(Index_Store_Tag_I, begin); | |
1091 | cache_op(Index_Store_Tag_D, begin); | |
1092 | cache_op(Index_Store_Tag_SD, begin); | |
1093 | ||
1094 | /* Now search for the wrap around point. */ | |
1095 | pow2 = (128 * 1024); | |
1096 | tmp = 0; | |
1097 | for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) { | |
1098 | cache_op(Index_Load_Tag_SD, addr); | |
1099 | __asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */ | |
1100 | if (!read_c0_taglo()) | |
1101 | break; | |
1102 | pow2 <<= 1; | |
1103 | } | |
1104 | local_irq_restore(flags); | |
1105 | addr -= begin; | |
1106 | ||
1107 | scache_size = addr; | |
1108 | c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22); | |
1109 | c->scache.ways = 1; | |
1110 | c->dcache.waybit = 0; /* does not matter */ | |
1111 | ||
1112 | return 1; | |
1113 | } | |
1114 | ||
1da177e4 LT |
1115 | extern int r5k_sc_init(void); |
1116 | extern int rm7k_sc_init(void); | |
9318c51a | 1117 | extern int mips_sc_init(void); |
1da177e4 LT |
1118 | |
1119 | static void __init setup_scache(void) | |
1120 | { | |
1121 | struct cpuinfo_mips *c = ¤t_cpu_data; | |
1122 | unsigned int config = read_c0_config(); | |
1da177e4 LT |
1123 | int sc_present = 0; |
1124 | ||
1125 | /* | |
1126 | * Do the probing thing on R4000SC and R4400SC processors. Other | |
1127 | * processors don't have a S-cache that would be relevant to the | |
1128 | * Linux memory managment. | |
1129 | */ | |
1130 | switch (c->cputype) { | |
1131 | case CPU_R4000SC: | |
1132 | case CPU_R4000MC: | |
1133 | case CPU_R4400SC: | |
1134 | case CPU_R4400MC: | |
ba5187db | 1135 | sc_present = run_uncached(probe_scache); |
1da177e4 LT |
1136 | if (sc_present) |
1137 | c->options |= MIPS_CPU_CACHE_CDEX_S; | |
1138 | break; | |
1139 | ||
1140 | case CPU_R10000: | |
1141 | case CPU_R12000: | |
44d921b2 | 1142 | case CPU_R14000: |
1da177e4 LT |
1143 | scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16); |
1144 | c->scache.linesz = 64 << ((config >> 13) & 1); | |
1145 | c->scache.ways = 2; | |
1146 | c->scache.waybit= 0; | |
1147 | sc_present = 1; | |
1148 | break; | |
1149 | ||
1150 | case CPU_R5000: | |
1151 | case CPU_NEVADA: | |
1152 | #ifdef CONFIG_R5000_CPU_SCACHE | |
1153 | r5k_sc_init(); | |
1154 | #endif | |
1155 | return; | |
1156 | ||
1157 | case CPU_RM7000: | |
1158 | case CPU_RM9000: | |
1159 | #ifdef CONFIG_RM7000_CPU_SCACHE | |
1160 | rm7k_sc_init(); | |
1161 | #endif | |
1162 | return; | |
1163 | ||
1164 | default: | |
9318c51a CD |
1165 | if (c->isa_level == MIPS_CPU_ISA_M32R1 || |
1166 | c->isa_level == MIPS_CPU_ISA_M32R2 || | |
1167 | c->isa_level == MIPS_CPU_ISA_M64R1 || | |
1168 | c->isa_level == MIPS_CPU_ISA_M64R2) { | |
1169 | #ifdef CONFIG_MIPS_CPU_SCACHE | |
1170 | if (mips_sc_init ()) { | |
1171 | scache_size = c->scache.ways * c->scache.sets * c->scache.linesz; | |
1172 | printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n", | |
1173 | scache_size >> 10, | |
1174 | way_string[c->scache.ways], c->scache.linesz); | |
1175 | } | |
1176 | #else | |
1177 | if (!(c->scache.flags & MIPS_CACHE_NOT_PRESENT)) | |
1178 | panic("Dunno how to handle MIPS32 / MIPS64 second level cache"); | |
1179 | #endif | |
1180 | return; | |
1181 | } | |
1da177e4 LT |
1182 | sc_present = 0; |
1183 | } | |
1184 | ||
1185 | if (!sc_present) | |
1186 | return; | |
1187 | ||
1da177e4 LT |
1188 | /* compute a couple of other cache variables */ |
1189 | c->scache.waysize = scache_size / c->scache.ways; | |
1190 | ||
1191 | c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways); | |
1192 | ||
1193 | printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n", | |
1194 | scache_size >> 10, way_string[c->scache.ways], c->scache.linesz); | |
1195 | ||
fc5d2d27 | 1196 | c->options |= MIPS_CPU_INCLUSIVE_CACHES; |
1da177e4 LT |
1197 | } |
1198 | ||
9370b351 SS |
1199 | void au1x00_fixup_config_od(void) |
1200 | { | |
1201 | /* | |
1202 | * c0_config.od (bit 19) was write only (and read as 0) | |
1203 | * on the early revisions of Alchemy SOCs. It disables the bus | |
1204 | * transaction overlapping and needs to be set to fix various errata. | |
1205 | */ | |
1206 | switch (read_c0_prid()) { | |
1207 | case 0x00030100: /* Au1000 DA */ | |
1208 | case 0x00030201: /* Au1000 HA */ | |
1209 | case 0x00030202: /* Au1000 HB */ | |
1210 | case 0x01030200: /* Au1500 AB */ | |
1211 | /* | |
1212 | * Au1100 errata actually keeps silence about this bit, so we set it | |
1213 | * just in case for those revisions that require it to be set according | |
1214 | * to arch/mips/au1000/common/cputable.c | |
1215 | */ | |
1216 | case 0x02030200: /* Au1100 AB */ | |
1217 | case 0x02030201: /* Au1100 BA */ | |
1218 | case 0x02030202: /* Au1100 BC */ | |
1219 | set_c0_config(1 << 19); | |
1220 | break; | |
1221 | } | |
1222 | } | |
1223 | ||
1da177e4 LT |
1224 | static inline void coherency_setup(void) |
1225 | { | |
1226 | change_c0_config(CONF_CM_CMASK, CONF_CM_DEFAULT); | |
1227 | ||
1228 | /* | |
1229 | * c0_status.cu=0 specifies that updates by the sc instruction use | |
1230 | * the coherency mode specified by the TLB; 1 means cachable | |
1231 | * coherent update on write will be used. Not all processors have | |
1232 | * this bit and; some wire it to zero, others like Toshiba had the | |
1233 | * silly idea of putting something else there ... | |
1234 | */ | |
1235 | switch (current_cpu_data.cputype) { | |
1236 | case CPU_R4000PC: | |
1237 | case CPU_R4000SC: | |
1238 | case CPU_R4000MC: | |
1239 | case CPU_R4400PC: | |
1240 | case CPU_R4400SC: | |
1241 | case CPU_R4400MC: | |
1242 | clear_c0_config(CONF_CU); | |
1243 | break; | |
9370b351 SS |
1244 | /* |
1245 | * We need to catch the ealry Alchemy SOCs with | |
1246 | * the write-only co_config.od bit and set it back to one... | |
1247 | */ | |
1248 | case CPU_AU1000: /* rev. DA, HA, HB */ | |
1249 | case CPU_AU1100: /* rev. AB, BA, BC ?? */ | |
1250 | case CPU_AU1500: /* rev. AB */ | |
1251 | au1x00_fixup_config_od(); | |
1252 | break; | |
1da177e4 LT |
1253 | } |
1254 | } | |
1255 | ||
02cf2119 | 1256 | void __init r4k_cache_init(void) |
1da177e4 LT |
1257 | { |
1258 | extern void build_clear_page(void); | |
1259 | extern void build_copy_page(void); | |
1260 | extern char except_vec2_generic; | |
1261 | struct cpuinfo_mips *c = ¤t_cpu_data; | |
1262 | ||
1263 | /* Default cache error handler for R4000 and R5000 family */ | |
e01402b1 | 1264 | set_uncached_handler (0x100, &except_vec2_generic, 0x80); |
1da177e4 LT |
1265 | |
1266 | probe_pcache(); | |
1267 | setup_scache(); | |
1268 | ||
1da177e4 LT |
1269 | r4k_blast_dcache_page_setup(); |
1270 | r4k_blast_dcache_page_indexed_setup(); | |
1271 | r4k_blast_dcache_setup(); | |
1272 | r4k_blast_icache_page_setup(); | |
1273 | r4k_blast_icache_page_indexed_setup(); | |
1274 | r4k_blast_icache_setup(); | |
1275 | r4k_blast_scache_page_setup(); | |
1276 | r4k_blast_scache_page_indexed_setup(); | |
1277 | r4k_blast_scache_setup(); | |
1278 | ||
1279 | /* | |
1280 | * Some MIPS32 and MIPS64 processors have physically indexed caches. | |
1281 | * This code supports virtually indexed processors and will be | |
1282 | * unnecessarily inefficient on physically indexed processors. | |
1283 | */ | |
73f40352 CD |
1284 | if (c->dcache.linesz) |
1285 | shm_align_mask = max_t( unsigned long, | |
1286 | c->dcache.sets * c->dcache.linesz - 1, | |
1287 | PAGE_SIZE - 1); | |
1288 | else | |
1289 | shm_align_mask = PAGE_SIZE-1; | |
1da177e4 LT |
1290 | flush_cache_all = r4k_flush_cache_all; |
1291 | __flush_cache_all = r4k___flush_cache_all; | |
1292 | flush_cache_mm = r4k_flush_cache_mm; | |
1293 | flush_cache_page = r4k_flush_cache_page; | |
1294 | flush_icache_page = r4k_flush_icache_page; | |
1295 | flush_cache_range = r4k_flush_cache_range; | |
1296 | ||
1297 | flush_cache_sigtramp = r4k_flush_cache_sigtramp; | |
1298 | flush_icache_all = r4k_flush_icache_all; | |
7e3bfc7c | 1299 | local_flush_data_cache_page = local_r4k_flush_data_cache_page; |
1da177e4 LT |
1300 | flush_data_cache_page = r4k_flush_data_cache_page; |
1301 | flush_icache_range = r4k_flush_icache_range; | |
1302 | ||
1303 | #ifdef CONFIG_DMA_NONCOHERENT | |
1304 | _dma_cache_wback_inv = r4k_dma_cache_wback_inv; | |
1305 | _dma_cache_wback = r4k_dma_cache_wback_inv; | |
1306 | _dma_cache_inv = r4k_dma_cache_inv; | |
1307 | #endif | |
1308 | ||
1da177e4 LT |
1309 | build_clear_page(); |
1310 | build_copy_page(); | |
1d40cfcd RB |
1311 | local_r4k___flush_cache_all(NULL); |
1312 | coherency_setup(); | |
1da177e4 | 1313 | } |