2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
7 * Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Ralf Baechle (ralf@gnu.org)
8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
10 #include <linux/init.h>
11 #include <linux/kernel.h>
12 #include <linux/sched.h>
14 #include <linux/bitops.h>
16 #include <asm/bcache.h>
17 #include <asm/bootinfo.h>
18 #include <asm/cache.h>
19 #include <asm/cacheops.h>
21 #include <asm/cpu-features.h>
24 #include <asm/pgtable.h>
25 #include <asm/r4kcache.h>
26 #include <asm/system.h>
27 #include <asm/mmu_context.h>
29 #include <asm/cacheflush.h> /* for run_uncached() */
33 * Special Variant of smp_call_function for use by cache functions:
36 * o collapses to normal function call on UP kernels
37 * o collapses to normal function call on systems with a single shared
40 static inline void r4k_on_each_cpu(void (*func) (void *info), void *info,
45 #if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC)
46 smp_call_function(func, info, retry, wait);
55 static unsigned long icache_size __read_mostly;
56 static unsigned long dcache_size __read_mostly;
57 static unsigned long scache_size __read_mostly;
60 * Dummy cache handling routines for machines without boardcaches
62 static void cache_noop(void) {}
64 static struct bcache_ops no_sc_ops = {
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
71 struct bcache_ops *bcops = &no_sc_ops;
73 #define cpu_is_r4600_v1_x() ((read_c0_prid() & 0xfffffff0) == 0x00002010)
74 #define cpu_is_r4600_v2_x() ((read_c0_prid() & 0xfffffff0) == 0x00002020)
76 #define R4600_HIT_CACHEOP_WAR_IMPL \
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"); \
84 static void (*r4k_blast_dcache_page)(unsigned long addr);
86 static inline void r4k_blast_dcache_page_dc32(unsigned long addr)
88 R4600_HIT_CACHEOP_WAR_IMPL;
89 blast_dcache32_page(addr);
92 static void __init r4k_blast_dcache_page_setup(void)
94 unsigned long dc_lsize = cpu_dcache_line_size();
97 r4k_blast_dcache_page = (void *)cache_noop;
98 else if (dc_lsize == 16)
99 r4k_blast_dcache_page = blast_dcache16_page;
100 else if (dc_lsize == 32)
101 r4k_blast_dcache_page = r4k_blast_dcache_page_dc32;
104 static void (* r4k_blast_dcache_page_indexed)(unsigned long addr);
106 static void __init r4k_blast_dcache_page_indexed_setup(void)
108 unsigned long dc_lsize = cpu_dcache_line_size();
111 r4k_blast_dcache_page_indexed = (void *)cache_noop;
112 else if (dc_lsize == 16)
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;
118 static void (* r4k_blast_dcache)(void);
120 static void __init r4k_blast_dcache_setup(void)
122 unsigned long dc_lsize = cpu_dcache_line_size();
125 r4k_blast_dcache = (void *)cache_noop;
126 else if (dc_lsize == 16)
127 r4k_blast_dcache = blast_dcache16;
128 else if (dc_lsize == 32)
129 r4k_blast_dcache = blast_dcache32;
132 /* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
133 #define JUMP_TO_ALIGN(order) \
134 __asm__ __volatile__( \
136 ".align\t" #order "\n\t" \
139 #define CACHE32_UNROLL32_ALIGN JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
140 #define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
142 static inline void blast_r4600_v1_icache32(void)
146 local_irq_save(flags);
148 local_irq_restore(flags);
151 static inline void tx49_blast_icache32(void)
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;
160 CACHE32_UNROLL32_ALIGN2;
161 /* I'm in even chunk. blast odd chunks */
162 for (ws = 0; ws < ws_end; ws += ws_inc)
163 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
164 cache32_unroll32(addr|ws,Index_Invalidate_I);
165 CACHE32_UNROLL32_ALIGN;
166 /* I'm in odd chunk. blast even chunks */
167 for (ws = 0; ws < ws_end; ws += ws_inc)
168 for (addr = start; addr < end; addr += 0x400 * 2)
169 cache32_unroll32(addr|ws,Index_Invalidate_I);
172 static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page)
176 local_irq_save(flags);
177 blast_icache32_page_indexed(page);
178 local_irq_restore(flags);
181 static inline void tx49_blast_icache32_page_indexed(unsigned long page)
183 unsigned long indexmask = current_cpu_data.icache.waysize - 1;
184 unsigned long start = INDEX_BASE + (page & indexmask);
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;
191 CACHE32_UNROLL32_ALIGN2;
192 /* I'm in even chunk. blast odd chunks */
193 for (ws = 0; ws < ws_end; ws += ws_inc)
194 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
195 cache32_unroll32(addr|ws,Index_Invalidate_I);
196 CACHE32_UNROLL32_ALIGN;
197 /* I'm in odd chunk. blast even chunks */
198 for (ws = 0; ws < ws_end; ws += ws_inc)
199 for (addr = start; addr < end; addr += 0x400 * 2)
200 cache32_unroll32(addr|ws,Index_Invalidate_I);
203 static void (* r4k_blast_icache_page)(unsigned long addr);
205 static void __init r4k_blast_icache_page_setup(void)
207 unsigned long ic_lsize = cpu_icache_line_size();
210 r4k_blast_icache_page = (void *)cache_noop;
211 else if (ic_lsize == 16)
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;
220 static void (* r4k_blast_icache_page_indexed)(unsigned long addr);
222 static void __init r4k_blast_icache_page_indexed_setup(void)
224 unsigned long ic_lsize = cpu_icache_line_size();
227 r4k_blast_icache_page_indexed = (void *)cache_noop;
228 else if (ic_lsize == 16)
229 r4k_blast_icache_page_indexed = blast_icache16_page_indexed;
230 else if (ic_lsize == 32) {
231 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
232 r4k_blast_icache_page_indexed =
233 blast_icache32_r4600_v1_page_indexed;
234 else if (TX49XX_ICACHE_INDEX_INV_WAR)
235 r4k_blast_icache_page_indexed =
236 tx49_blast_icache32_page_indexed;
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;
244 static void (* r4k_blast_icache)(void);
246 static void __init r4k_blast_icache_setup(void)
248 unsigned long ic_lsize = cpu_icache_line_size();
251 r4k_blast_icache = (void *)cache_noop;
252 else if (ic_lsize == 16)
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;
260 r4k_blast_icache = blast_icache32;
261 } else if (ic_lsize == 64)
262 r4k_blast_icache = blast_icache64;
265 static void (* r4k_blast_scache_page)(unsigned long addr);
267 static void __init r4k_blast_scache_page_setup(void)
269 unsigned long sc_lsize = cpu_scache_line_size();
271 if (scache_size == 0)
272 r4k_blast_scache_page = (void *)cache_noop;
273 else if (sc_lsize == 16)
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;
283 static void (* r4k_blast_scache_page_indexed)(unsigned long addr);
285 static void __init r4k_blast_scache_page_indexed_setup(void)
287 unsigned long sc_lsize = cpu_scache_line_size();
289 if (scache_size == 0)
290 r4k_blast_scache_page_indexed = (void *)cache_noop;
291 else if (sc_lsize == 16)
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;
301 static void (* r4k_blast_scache)(void);
303 static void __init r4k_blast_scache_setup(void)
305 unsigned long sc_lsize = cpu_scache_line_size();
307 if (scache_size == 0)
308 r4k_blast_scache = (void *)cache_noop;
309 else if (sc_lsize == 16)
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;
320 * This is former mm's flush_cache_all() which really should be
321 * flush_cache_vunmap these days ...
323 static inline void local_r4k_flush_cache_all(void * args)
328 static void r4k_flush_cache_all(void)
330 if (!cpu_has_dc_aliases)
333 r4k_on_each_cpu(local_r4k_flush_cache_all, NULL, 1, 1);
336 static inline void local_r4k___flush_cache_all(void * args)
338 #if defined(CONFIG_CPU_LOONGSON2)
345 switch (current_cpu_data.cputype) {
357 static void r4k___flush_cache_all(void)
359 r4k_on_each_cpu(local_r4k___flush_cache_all, NULL, 1, 1);
362 static inline void local_r4k_flush_cache_range(void * args)
364 struct vm_area_struct *vma = args;
366 if (!(cpu_context(smp_processor_id(), vma->vm_mm)))
372 static void r4k_flush_cache_range(struct vm_area_struct *vma,
373 unsigned long start, unsigned long end)
375 if (!cpu_has_dc_aliases)
378 r4k_on_each_cpu(local_r4k_flush_cache_range, vma, 1, 1);
381 static inline void local_r4k_flush_cache_mm(void * args)
383 struct mm_struct *mm = args;
385 if (!cpu_context(smp_processor_id(), mm))
389 * Kludge alert. For obscure reasons R4000SC and R4400SC go nuts if we
390 * only flush the primary caches but R10000 and R12000 behave sane ...
391 * R4000SC and R4400SC indexed S-cache ops also invalidate primary
392 * caches, so we can bail out early.
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) {
405 static void r4k_flush_cache_mm(struct mm_struct *mm)
407 if (!cpu_has_dc_aliases)
410 r4k_on_each_cpu(local_r4k_flush_cache_mm, mm, 1, 1);
413 struct flush_cache_page_args {
414 struct vm_area_struct *vma;
419 static inline void local_r4k_flush_cache_page(void *args)
421 struct flush_cache_page_args *fcp_args = args;
422 struct vm_area_struct *vma = fcp_args->vma;
423 unsigned long addr = fcp_args->addr;
424 unsigned long paddr = fcp_args->pfn << PAGE_SHIFT;
425 int exec = vma->vm_flags & VM_EXEC;
426 struct mm_struct *mm = vma->vm_mm;
433 * If ownes no valid ASID yet, cannot possibly have gotten
434 * this page into the cache.
436 if (cpu_context(smp_processor_id(), mm) == 0)
440 pgdp = pgd_offset(mm, addr);
441 pudp = pud_offset(pgdp, addr);
442 pmdp = pmd_offset(pudp, addr);
443 ptep = pte_offset(pmdp, addr);
446 * If the page isn't marked valid, the page cannot possibly be
449 if (!(pte_val(*ptep) & _PAGE_PRESENT))
453 * Doing flushes for another ASID than the current one is
454 * too difficult since stupid R4k caches do a TLB translation
455 * for every cache flush operation. So we do indexed flushes
456 * in that case, which doesn't overly flush the cache too much.
458 if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) {
459 if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
460 r4k_blast_dcache_page(addr);
461 if (exec && !cpu_icache_snoops_remote_store)
462 r4k_blast_scache_page(addr);
465 r4k_blast_icache_page(addr);
471 * Do indexed flush, too much work to get the (possible) TLB refills
474 if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
475 r4k_blast_dcache_page_indexed(cpu_has_pindexed_dcache ?
477 if (exec && !cpu_icache_snoops_remote_store) {
478 r4k_blast_scache_page_indexed(paddr);
482 if (cpu_has_vtag_icache && mm == current->active_mm) {
483 int cpu = smp_processor_id();
485 if (cpu_context(cpu, mm) != 0)
486 drop_mmu_context(mm, cpu);
488 r4k_blast_icache_page_indexed(addr);
492 static void r4k_flush_cache_page(struct vm_area_struct *vma,
493 unsigned long addr, unsigned long pfn)
495 struct flush_cache_page_args args;
501 r4k_on_each_cpu(local_r4k_flush_cache_page, &args, 1, 1);
504 static inline void local_r4k_flush_data_cache_page(void * addr)
506 r4k_blast_dcache_page((unsigned long) addr);
509 static void r4k_flush_data_cache_page(unsigned long addr)
511 r4k_on_each_cpu(local_r4k_flush_data_cache_page, (void *) addr, 1, 1);
514 struct flush_icache_range_args {
519 static inline void local_r4k_flush_icache_range(void *args)
521 struct flush_icache_range_args *fir_args = args;
522 unsigned long start = fir_args->start;
523 unsigned long end = fir_args->end;
525 if (!cpu_has_ic_fills_f_dc) {
526 if (end - start >= dcache_size) {
529 R4600_HIT_CACHEOP_WAR_IMPL;
530 protected_blast_dcache_range(start, end);
533 if (!cpu_icache_snoops_remote_store && scache_size) {
534 if (end - start > scache_size)
537 protected_blast_scache_range(start, end);
541 if (end - start > icache_size)
544 protected_blast_icache_range(start, end);
547 static void r4k_flush_icache_range(unsigned long start, unsigned long end)
549 struct flush_icache_range_args args;
554 r4k_on_each_cpu(local_r4k_flush_icache_range, &args, 1, 1);
555 instruction_hazard();
558 #ifdef CONFIG_DMA_NONCOHERENT
560 static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
562 /* Catch bad driver code */
565 if (cpu_has_inclusive_pcaches) {
566 if (size >= scache_size)
569 blast_scache_range(addr, addr + size);
574 * Either no secondary cache or the available caches don't have the
575 * subset property so we have to flush the primary caches
578 if (size >= dcache_size) {
581 R4600_HIT_CACHEOP_WAR_IMPL;
582 blast_dcache_range(addr, addr + size);
585 bc_wback_inv(addr, size);
588 static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
590 /* Catch bad driver code */
593 if (cpu_has_inclusive_pcaches) {
594 if (size >= scache_size)
597 blast_scache_range(addr, addr + size);
601 if (size >= dcache_size) {
604 R4600_HIT_CACHEOP_WAR_IMPL;
605 blast_dcache_range(addr, addr + size);
610 #endif /* CONFIG_DMA_NONCOHERENT */
613 * While we're protected against bad userland addresses we don't care
614 * very much about what happens in that case. Usually a segmentation
615 * fault will dump the process later on anyway ...
617 static void local_r4k_flush_cache_sigtramp(void * arg)
619 unsigned long ic_lsize = cpu_icache_line_size();
620 unsigned long dc_lsize = cpu_dcache_line_size();
621 unsigned long sc_lsize = cpu_scache_line_size();
622 unsigned long addr = (unsigned long) arg;
624 R4600_HIT_CACHEOP_WAR_IMPL;
626 protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
627 if (!cpu_icache_snoops_remote_store && scache_size)
628 protected_writeback_scache_line(addr & ~(sc_lsize - 1));
630 protected_flush_icache_line(addr & ~(ic_lsize - 1));
631 if (MIPS4K_ICACHE_REFILL_WAR) {
632 __asm__ __volatile__ (
647 : "i" (Hit_Invalidate_I));
649 if (MIPS_CACHE_SYNC_WAR)
650 __asm__ __volatile__ ("sync");
653 static void r4k_flush_cache_sigtramp(unsigned long addr)
655 r4k_on_each_cpu(local_r4k_flush_cache_sigtramp, (void *) addr, 1, 1);
658 static void r4k_flush_icache_all(void)
660 if (cpu_has_vtag_icache)
664 static inline void rm7k_erratum31(void)
666 const unsigned long ic_lsize = 32;
669 /* RM7000 erratum #31. The icache is screwed at startup. */
673 for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) {
674 __asm__ __volatile__ (
678 "cache\t%1, 0(%0)\n\t"
679 "cache\t%1, 0x1000(%0)\n\t"
680 "cache\t%1, 0x2000(%0)\n\t"
681 "cache\t%1, 0x3000(%0)\n\t"
682 "cache\t%2, 0(%0)\n\t"
683 "cache\t%2, 0x1000(%0)\n\t"
684 "cache\t%2, 0x2000(%0)\n\t"
685 "cache\t%2, 0x3000(%0)\n\t"
686 "cache\t%1, 0(%0)\n\t"
687 "cache\t%1, 0x1000(%0)\n\t"
688 "cache\t%1, 0x2000(%0)\n\t"
689 "cache\t%1, 0x3000(%0)\n\t"
692 : "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill));
696 static char *way_string[] __initdata = { NULL, "direct mapped", "2-way",
697 "3-way", "4-way", "5-way", "6-way", "7-way", "8-way"
700 static void __init probe_pcache(void)
702 struct cpuinfo_mips *c = ¤t_cpu_data;
703 unsigned int config = read_c0_config();
704 unsigned int prid = read_c0_prid();
705 unsigned long config1;
708 switch (c->cputype) {
709 case CPU_R4600: /* QED style two way caches? */
713 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
714 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
716 c->icache.waybit = __ffs(icache_size/2);
718 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
719 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
721 c->dcache.waybit= __ffs(dcache_size/2);
723 c->options |= MIPS_CPU_CACHE_CDEX_P;
728 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
729 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
733 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
734 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
736 c->dcache.waybit = 0;
738 c->options |= MIPS_CPU_CACHE_CDEX_P;
742 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
743 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
747 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
748 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
750 c->dcache.waybit = 0;
752 c->options |= MIPS_CPU_CACHE_CDEX_P;
753 c->options |= MIPS_CPU_PREFETCH;
763 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
764 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
766 c->icache.waybit = 0; /* doesn't matter */
768 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
769 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
771 c->dcache.waybit = 0; /* does not matter */
773 c->options |= MIPS_CPU_CACHE_CDEX_P;
779 icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29));
780 c->icache.linesz = 64;
782 c->icache.waybit = 0;
784 dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26));
785 c->dcache.linesz = 32;
787 c->dcache.waybit = 0;
789 c->options |= MIPS_CPU_PREFETCH;
793 write_c0_config(config & ~VR41_CONF_P4K);
795 /* Workaround for cache instruction bug of VR4131 */
796 if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U ||
797 c->processor_id == 0x0c82U) {
798 config |= 0x00400000U;
799 if (c->processor_id == 0x0c80U)
800 config |= VR41_CONF_BP;
801 write_c0_config(config);
803 c->options |= MIPS_CPU_CACHE_CDEX_P;
805 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
806 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
808 c->icache.waybit = __ffs(icache_size/2);
810 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
811 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
813 c->dcache.waybit = __ffs(dcache_size/2);
822 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
823 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
825 c->icache.waybit = 0; /* doesn't matter */
827 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
828 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
830 c->dcache.waybit = 0; /* does not matter */
832 c->options |= MIPS_CPU_CACHE_CDEX_P;
839 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
840 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
842 c->icache.waybit = __ffs(icache_size / c->icache.ways);
844 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
845 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
847 c->dcache.waybit = __ffs(dcache_size / c->dcache.ways);
849 #if !defined(CONFIG_SMP) || !defined(RM9000_CDEX_SMP_WAR)
850 c->options |= MIPS_CPU_CACHE_CDEX_P;
852 c->options |= MIPS_CPU_PREFETCH;
856 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
857 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
862 c->icache.waybit = 0;
864 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
865 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
870 c->dcache.waybit = 0;
874 if (!(config & MIPS_CONF_M))
875 panic("Don't know how to probe P-caches on this cpu.");
878 * So we seem to be a MIPS32 or MIPS64 CPU
879 * So let's probe the I-cache ...
881 config1 = read_c0_config1();
883 if ((lsize = ((config1 >> 19) & 7)))
884 c->icache.linesz = 2 << lsize;
886 c->icache.linesz = lsize;
887 c->icache.sets = 64 << ((config1 >> 22) & 7);
888 c->icache.ways = 1 + ((config1 >> 16) & 7);
890 icache_size = c->icache.sets *
893 c->icache.waybit = __ffs(icache_size/c->icache.ways);
895 if (config & 0x8) /* VI bit */
896 c->icache.flags |= MIPS_CACHE_VTAG;
899 * Now probe the MIPS32 / MIPS64 data cache.
903 if ((lsize = ((config1 >> 10) & 7)))
904 c->dcache.linesz = 2 << lsize;
906 c->dcache.linesz= lsize;
907 c->dcache.sets = 64 << ((config1 >> 13) & 7);
908 c->dcache.ways = 1 + ((config1 >> 7) & 7);
910 dcache_size = c->dcache.sets *
913 c->dcache.waybit = __ffs(dcache_size/c->dcache.ways);
915 c->options |= MIPS_CPU_PREFETCH;
920 * Processor configuration sanity check for the R4000SC erratum
921 * #5. With page sizes larger than 32kB there is no possibility
922 * to get a VCE exception anymore so we don't care about this
923 * misconfiguration. The case is rather theoretical anyway;
924 * presumably no vendor is shipping his hardware in the "bad"
927 if ((prid & 0xff00) == PRID_IMP_R4000 && (prid & 0xff) < 0x40 &&
928 !(config & CONF_SC) && c->icache.linesz != 16 &&
930 panic("Improper R4000SC processor configuration detected");
932 /* compute a couple of other cache variables */
933 c->icache.waysize = icache_size / c->icache.ways;
934 c->dcache.waysize = dcache_size / c->dcache.ways;
936 c->icache.sets = c->icache.linesz ?
937 icache_size / (c->icache.linesz * c->icache.ways) : 0;
938 c->dcache.sets = c->dcache.linesz ?
939 dcache_size / (c->dcache.linesz * c->dcache.ways) : 0;
942 * R10000 and R12000 P-caches are odd in a positive way. They're 32kB
943 * 2-way virtually indexed so normally would suffer from aliases. So
944 * normally they'd suffer from aliases but magic in the hardware deals
945 * with that for us so we don't need to take care ourselves.
947 switch (c->cputype) {
950 c->dcache.flags |= MIPS_CACHE_PINDEX;
959 if ((read_c0_config7() & (1 << 16))) {
960 /* effectively physically indexed dcache,
961 thus no virtual aliases. */
962 c->dcache.flags |= MIPS_CACHE_PINDEX;
966 if (c->dcache.waysize > PAGE_SIZE)
967 c->dcache.flags |= MIPS_CACHE_ALIASES;
970 switch (c->cputype) {
973 * Some older 20Kc chips doesn't have the 'VI' bit in
974 * the config register.
976 c->icache.flags |= MIPS_CACHE_VTAG;
984 c->icache.flags |= MIPS_CACHE_IC_F_DC;
988 #ifdef CONFIG_CPU_LOONGSON2
990 * LOONGSON2 has 4 way icache, but when using indexed cache op,
991 * one op will act on all 4 ways
996 printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
998 cpu_has_vtag_icache ? "virtually tagged" : "physically tagged",
999 way_string[c->icache.ways], c->icache.linesz);
1001 printk("Primary data cache %ldkB, %s, linesize %d bytes.\n",
1002 dcache_size >> 10, way_string[c->dcache.ways], c->dcache.linesz);
1006 * If you even _breathe_ on this function, look at the gcc output and make sure
1007 * it does not pop things on and off the stack for the cache sizing loop that
1008 * executes in KSEG1 space or else you will crash and burn badly. You have
1011 static int __init probe_scache(void)
1013 extern unsigned long stext;
1014 unsigned long flags, addr, begin, end, pow2;
1015 unsigned int config = read_c0_config();
1016 struct cpuinfo_mips *c = ¤t_cpu_data;
1019 if (config & CONF_SC)
1022 begin = (unsigned long) &stext;
1023 begin &= ~((4 * 1024 * 1024) - 1);
1024 end = begin + (4 * 1024 * 1024);
1027 * This is such a bitch, you'd think they would make it easy to do
1028 * this. Away you daemons of stupidity!
1030 local_irq_save(flags);
1032 /* Fill each size-multiple cache line with a valid tag. */
1034 for (addr = begin; addr < end; addr = (begin + pow2)) {
1035 unsigned long *p = (unsigned long *) addr;
1036 __asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
1040 /* Load first line with zero (therefore invalid) tag. */
1043 __asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
1044 cache_op(Index_Store_Tag_I, begin);
1045 cache_op(Index_Store_Tag_D, begin);
1046 cache_op(Index_Store_Tag_SD, begin);
1048 /* Now search for the wrap around point. */
1049 pow2 = (128 * 1024);
1051 for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) {
1052 cache_op(Index_Load_Tag_SD, addr);
1053 __asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
1054 if (!read_c0_taglo())
1058 local_irq_restore(flags);
1062 c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22);
1064 c->dcache.waybit = 0; /* does not matter */
1069 #if defined(CONFIG_CPU_LOONGSON2)
1070 static void __init loongson2_sc_init(void)
1072 struct cpuinfo_mips *c = ¤t_cpu_data;
1074 scache_size = 512*1024;
1075 c->scache.linesz = 32;
1077 c->scache.waybit = 0;
1078 c->scache.waysize = scache_size / (c->scache.ways);
1079 c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1080 pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1081 scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1083 c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1087 extern int r5k_sc_init(void);
1088 extern int rm7k_sc_init(void);
1089 extern int mips_sc_init(void);
1091 static void __init setup_scache(void)
1093 struct cpuinfo_mips *c = ¤t_cpu_data;
1094 unsigned int config = read_c0_config();
1098 * Do the probing thing on R4000SC and R4400SC processors. Other
1099 * processors don't have a S-cache that would be relevant to the
1100 * Linux memory managment.
1102 switch (c->cputype) {
1107 sc_present = run_uncached(probe_scache);
1109 c->options |= MIPS_CPU_CACHE_CDEX_S;
1115 scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16);
1116 c->scache.linesz = 64 << ((config >> 13) & 1);
1118 c->scache.waybit= 0;
1124 #ifdef CONFIG_R5000_CPU_SCACHE
1131 #ifdef CONFIG_RM7000_CPU_SCACHE
1136 #if defined(CONFIG_CPU_LOONGSON2)
1138 loongson2_sc_init();
1143 if (c->isa_level == MIPS_CPU_ISA_M32R1 ||
1144 c->isa_level == MIPS_CPU_ISA_M32R2 ||
1145 c->isa_level == MIPS_CPU_ISA_M64R1 ||
1146 c->isa_level == MIPS_CPU_ISA_M64R2) {
1147 #ifdef CONFIG_MIPS_CPU_SCACHE
1148 if (mips_sc_init ()) {
1149 scache_size = c->scache.ways * c->scache.sets * c->scache.linesz;
1150 printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n",
1152 way_string[c->scache.ways], c->scache.linesz);
1155 if (!(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
1156 panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
1166 /* compute a couple of other cache variables */
1167 c->scache.waysize = scache_size / c->scache.ways;
1169 c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1171 printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1172 scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1174 c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1177 void au1x00_fixup_config_od(void)
1180 * c0_config.od (bit 19) was write only (and read as 0)
1181 * on the early revisions of Alchemy SOCs. It disables the bus
1182 * transaction overlapping and needs to be set to fix various errata.
1184 switch (read_c0_prid()) {
1185 case 0x00030100: /* Au1000 DA */
1186 case 0x00030201: /* Au1000 HA */
1187 case 0x00030202: /* Au1000 HB */
1188 case 0x01030200: /* Au1500 AB */
1190 * Au1100 errata actually keeps silence about this bit, so we set it
1191 * just in case for those revisions that require it to be set according
1192 * to arch/mips/au1000/common/cputable.c
1194 case 0x02030200: /* Au1100 AB */
1195 case 0x02030201: /* Au1100 BA */
1196 case 0x02030202: /* Au1100 BC */
1197 set_c0_config(1 << 19);
1202 static void __init coherency_setup(void)
1204 change_c0_config(CONF_CM_CMASK, CONF_CM_DEFAULT);
1207 * c0_status.cu=0 specifies that updates by the sc instruction use
1208 * the coherency mode specified by the TLB; 1 means cachable
1209 * coherent update on write will be used. Not all processors have
1210 * this bit and; some wire it to zero, others like Toshiba had the
1211 * silly idea of putting something else there ...
1213 switch (current_cpu_data.cputype) {
1220 clear_c0_config(CONF_CU);
1223 * We need to catch the early Alchemy SOCs with
1224 * the write-only co_config.od bit and set it back to one...
1226 case CPU_AU1000: /* rev. DA, HA, HB */
1227 case CPU_AU1100: /* rev. AB, BA, BC ?? */
1228 case CPU_AU1500: /* rev. AB */
1229 au1x00_fixup_config_od();
1234 void __init r4k_cache_init(void)
1236 extern void build_clear_page(void);
1237 extern void build_copy_page(void);
1238 extern char except_vec2_generic;
1239 struct cpuinfo_mips *c = ¤t_cpu_data;
1241 /* Default cache error handler for R4000 and R5000 family */
1242 set_uncached_handler (0x100, &except_vec2_generic, 0x80);
1247 r4k_blast_dcache_page_setup();
1248 r4k_blast_dcache_page_indexed_setup();
1249 r4k_blast_dcache_setup();
1250 r4k_blast_icache_page_setup();
1251 r4k_blast_icache_page_indexed_setup();
1252 r4k_blast_icache_setup();
1253 r4k_blast_scache_page_setup();
1254 r4k_blast_scache_page_indexed_setup();
1255 r4k_blast_scache_setup();
1258 * Some MIPS32 and MIPS64 processors have physically indexed caches.
1259 * This code supports virtually indexed processors and will be
1260 * unnecessarily inefficient on physically indexed processors.
1262 if (c->dcache.linesz)
1263 shm_align_mask = max_t( unsigned long,
1264 c->dcache.sets * c->dcache.linesz - 1,
1267 shm_align_mask = PAGE_SIZE-1;
1268 flush_cache_all = r4k_flush_cache_all;
1269 __flush_cache_all = r4k___flush_cache_all;
1270 flush_cache_mm = r4k_flush_cache_mm;
1271 flush_cache_page = r4k_flush_cache_page;
1272 flush_cache_range = r4k_flush_cache_range;
1274 flush_cache_sigtramp = r4k_flush_cache_sigtramp;
1275 flush_icache_all = r4k_flush_icache_all;
1276 local_flush_data_cache_page = local_r4k_flush_data_cache_page;
1277 flush_data_cache_page = r4k_flush_data_cache_page;
1278 flush_icache_range = r4k_flush_icache_range;
1280 #ifdef CONFIG_DMA_NONCOHERENT
1281 _dma_cache_wback_inv = r4k_dma_cache_wback_inv;
1282 _dma_cache_wback = r4k_dma_cache_wback_inv;
1283 _dma_cache_inv = r4k_dma_cache_inv;
1288 local_r4k___flush_cache_all(NULL);