2 * r2300.c: R2000 and R3000 specific mmu/cache code.
4 * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
6 * with a lot of changes to make this thing work for R3000s
7 * Tx39XX R4k style caches added. HK
8 * Copyright (C) 1998, 1999, 2000 Harald Koerfgen
9 * Copyright (C) 1998 Gleb Raiko & Vladimir Roganov
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/sched.h>
16 #include <asm/cacheops.h>
18 #include <asm/pgtable.h>
19 #include <asm/mmu_context.h>
20 #include <asm/system.h>
21 #include <asm/isadep.h>
23 #include <asm/bootinfo.h>
26 /* For R3000 cores with R4000 style caches */
27 static unsigned long icache_size, dcache_size; /* Size in bytes */
29 #include <asm/r4kcache.h>
31 extern int r3k_have_wired_reg; /* in r3k-tlb.c */
33 /* This sequence is required to ensure icache is disabled immediately */
34 #define TX39_STOP_STREAMING() \
35 __asm__ __volatile__( \
37 ".set noreorder\n\t" \
44 /* TX39H-style cache flush routines. */
45 static void tx39h_flush_icache_all(void)
47 unsigned long start = KSEG0;
48 unsigned long end = (start + icache_size);
49 unsigned long flags, config;
51 /* disable icache (set ICE#) */
52 local_irq_save(flags);
53 config = read_c0_conf();
54 write_c0_conf(config & ~TX39_CONF_ICE);
55 TX39_STOP_STREAMING();
57 /* invalidate icache */
59 cache16_unroll32(start, Index_Invalidate_I);
63 write_c0_conf(config);
64 local_irq_restore(flags);
67 static void tx39h_dma_cache_wback_inv(unsigned long addr, unsigned long size)
70 unsigned long dc_lsize = current_cpu_data.dcache.linesz;
72 /* Catch bad driver code */
76 a = addr & ~(dc_lsize - 1);
77 end = (addr + size - 1) & ~(dc_lsize - 1);
79 invalidate_dcache_line(a); /* Hit_Invalidate_D */
87 static inline void tx39_blast_dcache_page(unsigned long addr)
89 if (current_cpu_data.cputype != CPU_TX3912)
90 blast_dcache16_page(addr);
93 static inline void tx39_blast_dcache_page_indexed(unsigned long addr)
95 blast_dcache16_page_indexed(addr);
98 static inline void tx39_blast_dcache(void)
103 static inline void tx39_blast_icache_page(unsigned long addr)
105 unsigned long flags, config;
106 /* disable icache (set ICE#) */
107 local_irq_save(flags);
108 config = read_c0_conf();
109 write_c0_conf(config & ~TX39_CONF_ICE);
110 TX39_STOP_STREAMING();
111 blast_icache16_page(addr);
112 write_c0_conf(config);
113 local_irq_restore(flags);
116 static inline void tx39_blast_icache_page_indexed(unsigned long addr)
118 unsigned long flags, config;
119 /* disable icache (set ICE#) */
120 local_irq_save(flags);
121 config = read_c0_conf();
122 write_c0_conf(config & ~TX39_CONF_ICE);
123 TX39_STOP_STREAMING();
124 blast_icache16_page_indexed(addr);
125 write_c0_conf(config);
126 local_irq_restore(flags);
129 static inline void tx39_blast_icache(void)
131 unsigned long flags, config;
132 /* disable icache (set ICE#) */
133 local_irq_save(flags);
134 config = read_c0_conf();
135 write_c0_conf(config & ~TX39_CONF_ICE);
136 TX39_STOP_STREAMING();
138 write_c0_conf(config);
139 local_irq_restore(flags);
142 static inline void tx39_flush_cache_all(void)
144 if (!cpu_has_dc_aliases)
151 static inline void tx39___flush_cache_all(void)
157 static void tx39_flush_cache_mm(struct mm_struct *mm)
159 if (!cpu_has_dc_aliases)
162 if (cpu_context(smp_processor_id(), mm) != 0) {
163 tx39_flush_cache_all();
167 static void tx39_flush_cache_range(struct vm_area_struct *vma,
168 unsigned long start, unsigned long end)
172 if (!(cpu_context(smp_processor_id(), vma->vm_mm)))
175 exec = vma->vm_flags & VM_EXEC;
176 if (cpu_has_dc_aliases || exec)
182 static void tx39_flush_cache_page(struct vm_area_struct *vma, unsigned long page, unsigned long pfn)
184 int exec = vma->vm_flags & VM_EXEC;
185 struct mm_struct *mm = vma->vm_mm;
192 * If ownes no valid ASID yet, cannot possibly have gotten
193 * this page into the cache.
195 if (cpu_context(smp_processor_id(), mm) == 0)
199 pgdp = pgd_offset(mm, page);
200 pudp = pud_offset(pgdp, page);
201 pmdp = pmd_offset(pudp, page);
202 ptep = pte_offset(pmdp, page);
205 * If the page isn't marked valid, the page cannot possibly be
208 if (!(pte_val(*ptep) & _PAGE_PRESENT))
212 * Doing flushes for another ASID than the current one is
213 * too difficult since stupid R4k caches do a TLB translation
214 * for every cache flush operation. So we do indexed flushes
215 * in that case, which doesn't overly flush the cache too much.
217 if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) {
218 if (cpu_has_dc_aliases || exec)
219 tx39_blast_dcache_page(page);
221 tx39_blast_icache_page(page);
227 * Do indexed flush, too much work to get the (possible) TLB refills
230 page = (KSEG0 + (page & (dcache_size - 1)));
231 if (cpu_has_dc_aliases || exec)
232 tx39_blast_dcache_page_indexed(page);
234 tx39_blast_icache_page_indexed(page);
237 static void tx39_flush_data_cache_page(unsigned long addr)
239 tx39_blast_dcache_page(addr);
242 static void tx39_flush_icache_range(unsigned long start, unsigned long end)
244 unsigned long dc_lsize = current_cpu_data.dcache.linesz;
245 unsigned long addr, aend;
247 if (end - start > dcache_size)
250 addr = start & ~(dc_lsize - 1);
251 aend = (end - 1) & ~(dc_lsize - 1);
254 /* Hit_Writeback_Inv_D */
255 protected_writeback_dcache_line(addr);
262 if (end - start > icache_size)
265 unsigned long flags, config;
266 addr = start & ~(dc_lsize - 1);
267 aend = (end - 1) & ~(dc_lsize - 1);
268 /* disable icache (set ICE#) */
269 local_irq_save(flags);
270 config = read_c0_conf();
271 write_c0_conf(config & ~TX39_CONF_ICE);
272 TX39_STOP_STREAMING();
274 /* Hit_Invalidate_I */
275 protected_flush_icache_line(addr);
280 write_c0_conf(config);
281 local_irq_restore(flags);
286 * Ok, this seriously sucks. We use them to flush a user page but don't
287 * know the virtual address, so we have to blast away the whole icache
288 * which is significantly more expensive than the real thing. Otoh we at
289 * least know the kernel address of the page so we can flush it
292 static void tx39_flush_icache_page(struct vm_area_struct *vma, struct page *page)
296 * If there's no context yet, or the page isn't executable, no icache
299 if (!(vma->vm_flags & VM_EXEC))
302 addr = (unsigned long) page_address(page);
303 tx39_blast_dcache_page(addr);
306 * We're not sure of the virtual address(es) involved here, so
307 * we have to flush the entire I-cache.
312 static void tx39_dma_cache_wback_inv(unsigned long addr, unsigned long size)
314 unsigned long end, a;
316 if (((size | addr) & (PAGE_SIZE - 1)) == 0) {
319 tx39_blast_dcache_page(addr);
321 } while(addr != end);
322 } else if (size > dcache_size) {
325 unsigned long dc_lsize = current_cpu_data.dcache.linesz;
326 a = addr & ~(dc_lsize - 1);
327 end = (addr + size - 1) & ~(dc_lsize - 1);
329 flush_dcache_line(a); /* Hit_Writeback_Inv_D */
336 static void tx39_dma_cache_inv(unsigned long addr, unsigned long size)
338 unsigned long end, a;
340 if (((size | addr) & (PAGE_SIZE - 1)) == 0) {
343 tx39_blast_dcache_page(addr);
345 } while(addr != end);
346 } else if (size > dcache_size) {
349 unsigned long dc_lsize = current_cpu_data.dcache.linesz;
350 a = addr & ~(dc_lsize - 1);
351 end = (addr + size - 1) & ~(dc_lsize - 1);
353 invalidate_dcache_line(a); /* Hit_Invalidate_D */
360 static void tx39_flush_cache_sigtramp(unsigned long addr)
362 unsigned long ic_lsize = current_cpu_data.icache.linesz;
363 unsigned long dc_lsize = current_cpu_data.dcache.linesz;
364 unsigned long config;
367 protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
369 /* disable icache (set ICE#) */
370 local_irq_save(flags);
371 config = read_c0_conf();
372 write_c0_conf(config & ~TX39_CONF_ICE);
373 TX39_STOP_STREAMING();
374 protected_flush_icache_line(addr & ~(ic_lsize - 1));
375 write_c0_conf(config);
376 local_irq_restore(flags);
379 static __init void tx39_probe_cache(void)
381 unsigned long config;
383 config = read_c0_conf();
385 icache_size = 1 << (10 + ((config & TX39_CONF_ICS_MASK) >>
386 TX39_CONF_ICS_SHIFT));
387 dcache_size = 1 << (10 + ((config & TX39_CONF_DCS_MASK) >>
388 TX39_CONF_DCS_SHIFT));
390 current_cpu_data.icache.linesz = 16;
391 switch (current_cpu_data.cputype) {
393 current_cpu_data.icache.ways = 1;
394 current_cpu_data.dcache.ways = 1;
395 current_cpu_data.dcache.linesz = 4;
399 current_cpu_data.icache.ways = 2;
400 current_cpu_data.dcache.ways = 2;
401 current_cpu_data.dcache.linesz = 16;
406 current_cpu_data.icache.ways = 1;
407 current_cpu_data.dcache.ways = 1;
408 current_cpu_data.dcache.linesz = 16;
413 void __init tx39_cache_init(void)
415 extern void build_clear_page(void);
416 extern void build_copy_page(void);
417 unsigned long config;
419 config = read_c0_conf();
420 config &= ~TX39_CONF_WBON;
421 write_c0_conf(config);
425 switch (current_cpu_data.cputype) {
427 /* TX39/H core (writethru direct-map cache) */
428 flush_cache_all = tx39h_flush_icache_all;
429 __flush_cache_all = tx39h_flush_icache_all;
430 flush_cache_mm = (void *) tx39h_flush_icache_all;
431 flush_cache_range = (void *) tx39h_flush_icache_all;
432 flush_cache_page = (void *) tx39h_flush_icache_all;
433 flush_icache_page = (void *) tx39h_flush_icache_all;
434 flush_icache_range = (void *) tx39h_flush_icache_all;
436 flush_cache_sigtramp = (void *) tx39h_flush_icache_all;
437 flush_data_cache_page = (void *) tx39h_flush_icache_all;
439 _dma_cache_wback_inv = tx39h_dma_cache_wback_inv;
441 shm_align_mask = PAGE_SIZE - 1;
448 /* TX39/H2,H3 core (writeback 2way-set-associative cache) */
449 r3k_have_wired_reg = 1;
450 write_c0_wired(0); /* set 8 on reset... */
451 /* board-dependent init code may set WBON */
453 flush_cache_all = tx39_flush_cache_all;
454 __flush_cache_all = tx39___flush_cache_all;
455 flush_cache_mm = tx39_flush_cache_mm;
456 flush_cache_range = tx39_flush_cache_range;
457 flush_cache_page = tx39_flush_cache_page;
458 flush_icache_page = tx39_flush_icache_page;
459 flush_icache_range = tx39_flush_icache_range;
461 flush_cache_sigtramp = tx39_flush_cache_sigtramp;
462 flush_data_cache_page = tx39_flush_data_cache_page;
464 _dma_cache_wback_inv = tx39_dma_cache_wback_inv;
465 _dma_cache_wback = tx39_dma_cache_wback_inv;
466 _dma_cache_inv = tx39_dma_cache_inv;
468 shm_align_mask = max_t(unsigned long,
469 (dcache_size / current_cpu_data.dcache.ways) - 1,
475 current_cpu_data.icache.waysize = icache_size / current_cpu_data.icache.ways;
476 current_cpu_data.dcache.waysize = dcache_size / current_cpu_data.dcache.ways;
478 current_cpu_data.icache.sets =
479 current_cpu_data.icache.waysize / current_cpu_data.icache.linesz;
480 current_cpu_data.dcache.sets =
481 current_cpu_data.dcache.waysize / current_cpu_data.dcache.linesz;
483 if (current_cpu_data.dcache.waysize > PAGE_SIZE)
484 current_cpu_data.dcache.flags |= MIPS_CACHE_ALIASES;
486 current_cpu_data.icache.waybit = 0;
487 current_cpu_data.dcache.waybit = 0;
489 printk("Primary instruction cache %ldkB, linesize %d bytes\n",
490 icache_size >> 10, current_cpu_data.icache.linesz);
491 printk("Primary data cache %ldkB, linesize %d bytes\n",
492 dcache_size >> 10, current_cpu_data.dcache.linesz);
496 tx39h_flush_icache_all();