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/sections.h>
27 #include <asm/system.h>
28 #include <asm/mmu_context.h>
30 #include <asm/cacheflush.h> /* for run_uncached() */
34 * Special Variant of smp_call_function for use by cache functions:
37 * o collapses to normal function call on UP kernels
38 * o collapses to normal function call on systems with a single shared
41 static inline void r4k_on_each_cpu(void (*func) (void *info), void *info,
46 #if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC)
47 smp_call_function(func, info, retry, wait);
56 static unsigned long icache_size __read_mostly;
57 static unsigned long dcache_size __read_mostly;
58 static unsigned long scache_size __read_mostly;
61 * Dummy cache handling routines for machines without boardcaches
63 static void cache_noop(void) {}
65 static struct bcache_ops no_sc_ops = {
66 .bc_enable = (void *)cache_noop,
67 .bc_disable = (void *)cache_noop,
68 .bc_wback_inv = (void *)cache_noop,
69 .bc_inv = (void *)cache_noop
72 struct bcache_ops *bcops = &no_sc_ops;
74 #define cpu_is_r4600_v1_x() ((read_c0_prid() & 0xfffffff0) == 0x00002010)
75 #define cpu_is_r4600_v2_x() ((read_c0_prid() & 0xfffffff0) == 0x00002020)
77 #define R4600_HIT_CACHEOP_WAR_IMPL \
79 if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x()) \
80 *(volatile unsigned long *)CKSEG1; \
81 if (R4600_V1_HIT_CACHEOP_WAR) \
82 __asm__ __volatile__("nop;nop;nop;nop"); \
85 static void (*r4k_blast_dcache_page)(unsigned long addr);
87 static inline void r4k_blast_dcache_page_dc32(unsigned long addr)
89 R4600_HIT_CACHEOP_WAR_IMPL;
90 blast_dcache32_page(addr);
93 static void __init r4k_blast_dcache_page_setup(void)
95 unsigned long dc_lsize = cpu_dcache_line_size();
98 r4k_blast_dcache_page = (void *)cache_noop;
99 else if (dc_lsize == 16)
100 r4k_blast_dcache_page = blast_dcache16_page;
101 else if (dc_lsize == 32)
102 r4k_blast_dcache_page = r4k_blast_dcache_page_dc32;
105 static void (* r4k_blast_dcache_page_indexed)(unsigned long addr);
107 static void __init r4k_blast_dcache_page_indexed_setup(void)
109 unsigned long dc_lsize = cpu_dcache_line_size();
112 r4k_blast_dcache_page_indexed = (void *)cache_noop;
113 else if (dc_lsize == 16)
114 r4k_blast_dcache_page_indexed = blast_dcache16_page_indexed;
115 else if (dc_lsize == 32)
116 r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed;
119 static void (* r4k_blast_dcache)(void);
121 static void __init r4k_blast_dcache_setup(void)
123 unsigned long dc_lsize = cpu_dcache_line_size();
126 r4k_blast_dcache = (void *)cache_noop;
127 else if (dc_lsize == 16)
128 r4k_blast_dcache = blast_dcache16;
129 else if (dc_lsize == 32)
130 r4k_blast_dcache = blast_dcache32;
133 /* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
134 #define JUMP_TO_ALIGN(order) \
135 __asm__ __volatile__( \
137 ".align\t" #order "\n\t" \
140 #define CACHE32_UNROLL32_ALIGN JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
141 #define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
143 static inline void blast_r4600_v1_icache32(void)
147 local_irq_save(flags);
149 local_irq_restore(flags);
152 static inline void tx49_blast_icache32(void)
154 unsigned long start = INDEX_BASE;
155 unsigned long end = start + current_cpu_data.icache.waysize;
156 unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
157 unsigned long ws_end = current_cpu_data.icache.ways <<
158 current_cpu_data.icache.waybit;
159 unsigned long ws, addr;
161 CACHE32_UNROLL32_ALIGN2;
162 /* I'm in even chunk. blast odd chunks */
163 for (ws = 0; ws < ws_end; ws += ws_inc)
164 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
165 cache32_unroll32(addr|ws,Index_Invalidate_I);
166 CACHE32_UNROLL32_ALIGN;
167 /* I'm in odd chunk. blast even chunks */
168 for (ws = 0; ws < ws_end; ws += ws_inc)
169 for (addr = start; addr < end; addr += 0x400 * 2)
170 cache32_unroll32(addr|ws,Index_Invalidate_I);
173 static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page)
177 local_irq_save(flags);
178 blast_icache32_page_indexed(page);
179 local_irq_restore(flags);
182 static inline void tx49_blast_icache32_page_indexed(unsigned long page)
184 unsigned long indexmask = current_cpu_data.icache.waysize - 1;
185 unsigned long start = INDEX_BASE + (page & indexmask);
186 unsigned long end = start + PAGE_SIZE;
187 unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
188 unsigned long ws_end = current_cpu_data.icache.ways <<
189 current_cpu_data.icache.waybit;
190 unsigned long ws, addr;
192 CACHE32_UNROLL32_ALIGN2;
193 /* I'm in even chunk. blast odd chunks */
194 for (ws = 0; ws < ws_end; ws += ws_inc)
195 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
196 cache32_unroll32(addr|ws,Index_Invalidate_I);
197 CACHE32_UNROLL32_ALIGN;
198 /* I'm in odd chunk. blast even chunks */
199 for (ws = 0; ws < ws_end; ws += ws_inc)
200 for (addr = start; addr < end; addr += 0x400 * 2)
201 cache32_unroll32(addr|ws,Index_Invalidate_I);
204 static void (* r4k_blast_icache_page)(unsigned long addr);
206 static void __init r4k_blast_icache_page_setup(void)
208 unsigned long ic_lsize = cpu_icache_line_size();
211 r4k_blast_icache_page = (void *)cache_noop;
212 else if (ic_lsize == 16)
213 r4k_blast_icache_page = blast_icache16_page;
214 else if (ic_lsize == 32)
215 r4k_blast_icache_page = blast_icache32_page;
216 else if (ic_lsize == 64)
217 r4k_blast_icache_page = blast_icache64_page;
221 static void (* r4k_blast_icache_page_indexed)(unsigned long addr);
223 static void __init r4k_blast_icache_page_indexed_setup(void)
225 unsigned long ic_lsize = cpu_icache_line_size();
228 r4k_blast_icache_page_indexed = (void *)cache_noop;
229 else if (ic_lsize == 16)
230 r4k_blast_icache_page_indexed = blast_icache16_page_indexed;
231 else if (ic_lsize == 32) {
232 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
233 r4k_blast_icache_page_indexed =
234 blast_icache32_r4600_v1_page_indexed;
235 else if (TX49XX_ICACHE_INDEX_INV_WAR)
236 r4k_blast_icache_page_indexed =
237 tx49_blast_icache32_page_indexed;
239 r4k_blast_icache_page_indexed =
240 blast_icache32_page_indexed;
241 } else if (ic_lsize == 64)
242 r4k_blast_icache_page_indexed = blast_icache64_page_indexed;
245 static void (* r4k_blast_icache)(void);
247 static void __init r4k_blast_icache_setup(void)
249 unsigned long ic_lsize = cpu_icache_line_size();
252 r4k_blast_icache = (void *)cache_noop;
253 else if (ic_lsize == 16)
254 r4k_blast_icache = blast_icache16;
255 else if (ic_lsize == 32) {
256 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
257 r4k_blast_icache = blast_r4600_v1_icache32;
258 else if (TX49XX_ICACHE_INDEX_INV_WAR)
259 r4k_blast_icache = tx49_blast_icache32;
261 r4k_blast_icache = blast_icache32;
262 } else if (ic_lsize == 64)
263 r4k_blast_icache = blast_icache64;
266 static void (* r4k_blast_scache_page)(unsigned long addr);
268 static void __init r4k_blast_scache_page_setup(void)
270 unsigned long sc_lsize = cpu_scache_line_size();
272 if (scache_size == 0)
273 r4k_blast_scache_page = (void *)cache_noop;
274 else if (sc_lsize == 16)
275 r4k_blast_scache_page = blast_scache16_page;
276 else if (sc_lsize == 32)
277 r4k_blast_scache_page = blast_scache32_page;
278 else if (sc_lsize == 64)
279 r4k_blast_scache_page = blast_scache64_page;
280 else if (sc_lsize == 128)
281 r4k_blast_scache_page = blast_scache128_page;
284 static void (* r4k_blast_scache_page_indexed)(unsigned long addr);
286 static void __init r4k_blast_scache_page_indexed_setup(void)
288 unsigned long sc_lsize = cpu_scache_line_size();
290 if (scache_size == 0)
291 r4k_blast_scache_page_indexed = (void *)cache_noop;
292 else if (sc_lsize == 16)
293 r4k_blast_scache_page_indexed = blast_scache16_page_indexed;
294 else if (sc_lsize == 32)
295 r4k_blast_scache_page_indexed = blast_scache32_page_indexed;
296 else if (sc_lsize == 64)
297 r4k_blast_scache_page_indexed = blast_scache64_page_indexed;
298 else if (sc_lsize == 128)
299 r4k_blast_scache_page_indexed = blast_scache128_page_indexed;
302 static void (* r4k_blast_scache)(void);
304 static void __init r4k_blast_scache_setup(void)
306 unsigned long sc_lsize = cpu_scache_line_size();
308 if (scache_size == 0)
309 r4k_blast_scache = (void *)cache_noop;
310 else if (sc_lsize == 16)
311 r4k_blast_scache = blast_scache16;
312 else if (sc_lsize == 32)
313 r4k_blast_scache = blast_scache32;
314 else if (sc_lsize == 64)
315 r4k_blast_scache = blast_scache64;
316 else if (sc_lsize == 128)
317 r4k_blast_scache = blast_scache128;
321 * This is former mm's flush_cache_all() which really should be
322 * flush_cache_vunmap these days ...
324 static inline void local_r4k_flush_cache_all(void * args)
329 static void r4k_flush_cache_all(void)
331 if (!cpu_has_dc_aliases)
334 r4k_on_each_cpu(local_r4k_flush_cache_all, NULL, 1, 1);
337 static inline void local_r4k___flush_cache_all(void * args)
339 #if defined(CONFIG_CPU_LOONGSON2)
346 switch (current_cpu_data.cputype) {
358 static void r4k___flush_cache_all(void)
360 r4k_on_each_cpu(local_r4k___flush_cache_all, NULL, 1, 1);
363 static inline void local_r4k_flush_cache_range(void * args)
365 struct vm_area_struct *vma = args;
367 if (!(cpu_context(smp_processor_id(), vma->vm_mm)))
373 static void r4k_flush_cache_range(struct vm_area_struct *vma,
374 unsigned long start, unsigned long end)
376 if (!cpu_has_dc_aliases)
379 r4k_on_each_cpu(local_r4k_flush_cache_range, vma, 1, 1);
382 static inline void local_r4k_flush_cache_mm(void * args)
384 struct mm_struct *mm = args;
386 if (!cpu_context(smp_processor_id(), mm))
390 * Kludge alert. For obscure reasons R4000SC and R4400SC go nuts if we
391 * only flush the primary caches but R10000 and R12000 behave sane ...
392 * R4000SC and R4400SC indexed S-cache ops also invalidate primary
393 * caches, so we can bail out early.
395 if (current_cpu_data.cputype == CPU_R4000SC ||
396 current_cpu_data.cputype == CPU_R4000MC ||
397 current_cpu_data.cputype == CPU_R4400SC ||
398 current_cpu_data.cputype == CPU_R4400MC) {
406 static void r4k_flush_cache_mm(struct mm_struct *mm)
408 if (!cpu_has_dc_aliases)
411 r4k_on_each_cpu(local_r4k_flush_cache_mm, mm, 1, 1);
414 struct flush_cache_page_args {
415 struct vm_area_struct *vma;
420 static inline void local_r4k_flush_cache_page(void *args)
422 struct flush_cache_page_args *fcp_args = args;
423 struct vm_area_struct *vma = fcp_args->vma;
424 unsigned long addr = fcp_args->addr;
425 unsigned long paddr = fcp_args->pfn << PAGE_SHIFT;
426 int exec = vma->vm_flags & VM_EXEC;
427 struct mm_struct *mm = vma->vm_mm;
434 * If ownes no valid ASID yet, cannot possibly have gotten
435 * this page into the cache.
437 if (cpu_context(smp_processor_id(), mm) == 0)
441 pgdp = pgd_offset(mm, addr);
442 pudp = pud_offset(pgdp, addr);
443 pmdp = pmd_offset(pudp, addr);
444 ptep = pte_offset(pmdp, addr);
447 * If the page isn't marked valid, the page cannot possibly be
450 if (!(pte_val(*ptep) & _PAGE_PRESENT))
454 * Doing flushes for another ASID than the current one is
455 * too difficult since stupid R4k caches do a TLB translation
456 * for every cache flush operation. So we do indexed flushes
457 * in that case, which doesn't overly flush the cache too much.
459 if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) {
460 if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
461 r4k_blast_dcache_page(addr);
462 if (exec && !cpu_icache_snoops_remote_store)
463 r4k_blast_scache_page(addr);
466 r4k_blast_icache_page(addr);
472 * Do indexed flush, too much work to get the (possible) TLB refills
475 if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
476 r4k_blast_dcache_page_indexed(cpu_has_pindexed_dcache ?
478 if (exec && !cpu_icache_snoops_remote_store) {
479 r4k_blast_scache_page_indexed(paddr);
483 if (cpu_has_vtag_icache && mm == current->active_mm) {
484 int cpu = smp_processor_id();
486 if (cpu_context(cpu, mm) != 0)
487 drop_mmu_context(mm, cpu);
489 r4k_blast_icache_page_indexed(addr);
493 static void r4k_flush_cache_page(struct vm_area_struct *vma,
494 unsigned long addr, unsigned long pfn)
496 struct flush_cache_page_args args;
502 r4k_on_each_cpu(local_r4k_flush_cache_page, &args, 1, 1);
505 static inline void local_r4k_flush_data_cache_page(void * addr)
507 r4k_blast_dcache_page((unsigned long) addr);
510 static void r4k_flush_data_cache_page(unsigned long addr)
512 r4k_on_each_cpu(local_r4k_flush_data_cache_page, (void *) addr, 1, 1);
515 struct flush_icache_range_args {
520 static inline void local_r4k_flush_icache_range(void *args)
522 struct flush_icache_range_args *fir_args = args;
523 unsigned long start = fir_args->start;
524 unsigned long end = fir_args->end;
526 if (!cpu_has_ic_fills_f_dc) {
527 if (end - start >= dcache_size) {
530 R4600_HIT_CACHEOP_WAR_IMPL;
531 protected_blast_dcache_range(start, end);
534 if (!cpu_icache_snoops_remote_store && scache_size) {
535 if (end - start > scache_size)
538 protected_blast_scache_range(start, end);
542 if (end - start > icache_size)
545 protected_blast_icache_range(start, end);
548 static void r4k_flush_icache_range(unsigned long start, unsigned long end)
550 struct flush_icache_range_args args;
555 r4k_on_each_cpu(local_r4k_flush_icache_range, &args, 1, 1);
556 instruction_hazard();
559 #ifdef CONFIG_DMA_NONCOHERENT
561 static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
563 /* Catch bad driver code */
566 if (cpu_has_inclusive_pcaches) {
567 if (size >= scache_size)
570 blast_scache_range(addr, addr + size);
575 * Either no secondary cache or the available caches don't have the
576 * subset property so we have to flush the primary caches
579 if (size >= dcache_size) {
582 R4600_HIT_CACHEOP_WAR_IMPL;
583 blast_dcache_range(addr, addr + size);
586 bc_wback_inv(addr, size);
589 static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
591 /* Catch bad driver code */
594 if (cpu_has_inclusive_pcaches) {
595 if (size >= scache_size)
598 blast_scache_range(addr, addr + size);
602 if (size >= dcache_size) {
605 R4600_HIT_CACHEOP_WAR_IMPL;
606 blast_dcache_range(addr, addr + size);
611 #endif /* CONFIG_DMA_NONCOHERENT */
614 * While we're protected against bad userland addresses we don't care
615 * very much about what happens in that case. Usually a segmentation
616 * fault will dump the process later on anyway ...
618 static void local_r4k_flush_cache_sigtramp(void * arg)
620 unsigned long ic_lsize = cpu_icache_line_size();
621 unsigned long dc_lsize = cpu_dcache_line_size();
622 unsigned long sc_lsize = cpu_scache_line_size();
623 unsigned long addr = (unsigned long) arg;
625 R4600_HIT_CACHEOP_WAR_IMPL;
627 protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
628 if (!cpu_icache_snoops_remote_store && scache_size)
629 protected_writeback_scache_line(addr & ~(sc_lsize - 1));
631 protected_flush_icache_line(addr & ~(ic_lsize - 1));
632 if (MIPS4K_ICACHE_REFILL_WAR) {
633 __asm__ __volatile__ (
648 : "i" (Hit_Invalidate_I));
650 if (MIPS_CACHE_SYNC_WAR)
651 __asm__ __volatile__ ("sync");
654 static void r4k_flush_cache_sigtramp(unsigned long addr)
656 r4k_on_each_cpu(local_r4k_flush_cache_sigtramp, (void *) addr, 1, 1);
659 static void r4k_flush_icache_all(void)
661 if (cpu_has_vtag_icache)
665 static inline void rm7k_erratum31(void)
667 const unsigned long ic_lsize = 32;
670 /* RM7000 erratum #31. The icache is screwed at startup. */
674 for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) {
675 __asm__ __volatile__ (
679 "cache\t%1, 0(%0)\n\t"
680 "cache\t%1, 0x1000(%0)\n\t"
681 "cache\t%1, 0x2000(%0)\n\t"
682 "cache\t%1, 0x3000(%0)\n\t"
683 "cache\t%2, 0(%0)\n\t"
684 "cache\t%2, 0x1000(%0)\n\t"
685 "cache\t%2, 0x2000(%0)\n\t"
686 "cache\t%2, 0x3000(%0)\n\t"
687 "cache\t%1, 0(%0)\n\t"
688 "cache\t%1, 0x1000(%0)\n\t"
689 "cache\t%1, 0x2000(%0)\n\t"
690 "cache\t%1, 0x3000(%0)\n\t"
693 : "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill));
697 static char *way_string[] __initdata = { NULL, "direct mapped", "2-way",
698 "3-way", "4-way", "5-way", "6-way", "7-way", "8-way"
701 static void __init probe_pcache(void)
703 struct cpuinfo_mips *c = ¤t_cpu_data;
704 unsigned int config = read_c0_config();
705 unsigned int prid = read_c0_prid();
706 unsigned long config1;
709 switch (c->cputype) {
710 case CPU_R4600: /* QED style two way caches? */
714 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
715 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
717 c->icache.waybit = __ffs(icache_size/2);
719 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
720 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
722 c->dcache.waybit= __ffs(dcache_size/2);
724 c->options |= MIPS_CPU_CACHE_CDEX_P;
729 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
730 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
734 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
735 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
737 c->dcache.waybit = 0;
739 c->options |= MIPS_CPU_CACHE_CDEX_P;
743 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
744 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
748 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
749 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
751 c->dcache.waybit = 0;
753 c->options |= MIPS_CPU_CACHE_CDEX_P;
754 c->options |= MIPS_CPU_PREFETCH;
764 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
765 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
767 c->icache.waybit = 0; /* doesn't matter */
769 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
770 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
772 c->dcache.waybit = 0; /* does not matter */
774 c->options |= MIPS_CPU_CACHE_CDEX_P;
780 icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29));
781 c->icache.linesz = 64;
783 c->icache.waybit = 0;
785 dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26));
786 c->dcache.linesz = 32;
788 c->dcache.waybit = 0;
790 c->options |= MIPS_CPU_PREFETCH;
794 write_c0_config(config & ~VR41_CONF_P4K);
796 /* Workaround for cache instruction bug of VR4131 */
797 if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U ||
798 c->processor_id == 0x0c82U) {
799 config |= 0x00400000U;
800 if (c->processor_id == 0x0c80U)
801 config |= VR41_CONF_BP;
802 write_c0_config(config);
804 c->options |= MIPS_CPU_CACHE_CDEX_P;
806 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
807 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
809 c->icache.waybit = __ffs(icache_size/2);
811 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
812 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
814 c->dcache.waybit = __ffs(dcache_size/2);
823 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
824 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
826 c->icache.waybit = 0; /* doesn't matter */
828 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
829 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
831 c->dcache.waybit = 0; /* does not matter */
833 c->options |= MIPS_CPU_CACHE_CDEX_P;
840 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
841 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
843 c->icache.waybit = __ffs(icache_size / c->icache.ways);
845 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
846 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
848 c->dcache.waybit = __ffs(dcache_size / c->dcache.ways);
850 #if !defined(CONFIG_SMP) || !defined(RM9000_CDEX_SMP_WAR)
851 c->options |= MIPS_CPU_CACHE_CDEX_P;
853 c->options |= MIPS_CPU_PREFETCH;
857 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
858 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
863 c->icache.waybit = 0;
865 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
866 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
871 c->dcache.waybit = 0;
875 if (!(config & MIPS_CONF_M))
876 panic("Don't know how to probe P-caches on this cpu.");
879 * So we seem to be a MIPS32 or MIPS64 CPU
880 * So let's probe the I-cache ...
882 config1 = read_c0_config1();
884 if ((lsize = ((config1 >> 19) & 7)))
885 c->icache.linesz = 2 << lsize;
887 c->icache.linesz = lsize;
888 c->icache.sets = 64 << ((config1 >> 22) & 7);
889 c->icache.ways = 1 + ((config1 >> 16) & 7);
891 icache_size = c->icache.sets *
894 c->icache.waybit = __ffs(icache_size/c->icache.ways);
896 if (config & 0x8) /* VI bit */
897 c->icache.flags |= MIPS_CACHE_VTAG;
900 * Now probe the MIPS32 / MIPS64 data cache.
904 if ((lsize = ((config1 >> 10) & 7)))
905 c->dcache.linesz = 2 << lsize;
907 c->dcache.linesz= lsize;
908 c->dcache.sets = 64 << ((config1 >> 13) & 7);
909 c->dcache.ways = 1 + ((config1 >> 7) & 7);
911 dcache_size = c->dcache.sets *
914 c->dcache.waybit = __ffs(dcache_size/c->dcache.ways);
916 c->options |= MIPS_CPU_PREFETCH;
921 * Processor configuration sanity check for the R4000SC erratum
922 * #5. With page sizes larger than 32kB there is no possibility
923 * to get a VCE exception anymore so we don't care about this
924 * misconfiguration. The case is rather theoretical anyway;
925 * presumably no vendor is shipping his hardware in the "bad"
928 if ((prid & 0xff00) == PRID_IMP_R4000 && (prid & 0xff) < 0x40 &&
929 !(config & CONF_SC) && c->icache.linesz != 16 &&
931 panic("Improper R4000SC processor configuration detected");
933 /* compute a couple of other cache variables */
934 c->icache.waysize = icache_size / c->icache.ways;
935 c->dcache.waysize = dcache_size / c->dcache.ways;
937 c->icache.sets = c->icache.linesz ?
938 icache_size / (c->icache.linesz * c->icache.ways) : 0;
939 c->dcache.sets = c->dcache.linesz ?
940 dcache_size / (c->dcache.linesz * c->dcache.ways) : 0;
943 * R10000 and R12000 P-caches are odd in a positive way. They're 32kB
944 * 2-way virtually indexed so normally would suffer from aliases. So
945 * normally they'd suffer from aliases but magic in the hardware deals
946 * with that for us so we don't need to take care ourselves.
948 switch (c->cputype) {
951 c->dcache.flags |= MIPS_CACHE_PINDEX;
960 if ((read_c0_config7() & (1 << 16))) {
961 /* effectively physically indexed dcache,
962 thus no virtual aliases. */
963 c->dcache.flags |= MIPS_CACHE_PINDEX;
967 if (c->dcache.waysize > PAGE_SIZE)
968 c->dcache.flags |= MIPS_CACHE_ALIASES;
971 switch (c->cputype) {
974 * Some older 20Kc chips doesn't have the 'VI' bit in
975 * the config register.
977 c->icache.flags |= MIPS_CACHE_VTAG;
985 c->icache.flags |= MIPS_CACHE_IC_F_DC;
989 #ifdef CONFIG_CPU_LOONGSON2
991 * LOONGSON2 has 4 way icache, but when using indexed cache op,
992 * one op will act on all 4 ways
997 printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
999 cpu_has_vtag_icache ? "virtually tagged" : "physically tagged",
1000 way_string[c->icache.ways], c->icache.linesz);
1002 printk("Primary data cache %ldkB, %s, linesize %d bytes.\n",
1003 dcache_size >> 10, way_string[c->dcache.ways], c->dcache.linesz);
1007 * If you even _breathe_ on this function, look at the gcc output and make sure
1008 * it does not pop things on and off the stack for the cache sizing loop that
1009 * executes in KSEG1 space or else you will crash and burn badly. You have
1012 static int __init probe_scache(void)
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);