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 flags, config;
49 /* disable icache (set ICE#) */
50 local_irq_save(flags);
51 config = read_c0_conf();
52 write_c0_conf(config & ~TX39_CONF_ICE);
53 TX39_STOP_STREAMING();
55 write_c0_conf(config);
56 local_irq_restore(flags);
59 static void tx39h_dma_cache_wback_inv(unsigned long addr, unsigned long size)
61 /* Catch bad driver code */
65 blast_inv_dcache_range(addr, addr + size);
70 static inline void tx39_blast_dcache_page(unsigned long addr)
72 if (current_cpu_data.cputype != CPU_TX3912)
73 blast_dcache16_page(addr);
76 static inline void tx39_blast_dcache_page_indexed(unsigned long addr)
78 blast_dcache16_page_indexed(addr);
81 static inline void tx39_blast_dcache(void)
86 static inline void tx39_blast_icache_page(unsigned long addr)
88 unsigned long flags, config;
89 /* disable icache (set ICE#) */
90 local_irq_save(flags);
91 config = read_c0_conf();
92 write_c0_conf(config & ~TX39_CONF_ICE);
93 TX39_STOP_STREAMING();
94 blast_icache16_page(addr);
95 write_c0_conf(config);
96 local_irq_restore(flags);
99 static inline void tx39_blast_icache_page_indexed(unsigned long addr)
101 unsigned long flags, config;
102 /* disable icache (set ICE#) */
103 local_irq_save(flags);
104 config = read_c0_conf();
105 write_c0_conf(config & ~TX39_CONF_ICE);
106 TX39_STOP_STREAMING();
107 blast_icache16_page_indexed(addr);
108 write_c0_conf(config);
109 local_irq_restore(flags);
112 static inline void tx39_blast_icache(void)
114 unsigned long flags, config;
115 /* disable icache (set ICE#) */
116 local_irq_save(flags);
117 config = read_c0_conf();
118 write_c0_conf(config & ~TX39_CONF_ICE);
119 TX39_STOP_STREAMING();
121 write_c0_conf(config);
122 local_irq_restore(flags);
125 static inline void tx39_flush_cache_all(void)
127 if (!cpu_has_dc_aliases)
134 static inline void tx39___flush_cache_all(void)
140 static void tx39_flush_cache_mm(struct mm_struct *mm)
142 if (!cpu_has_dc_aliases)
145 if (cpu_context(smp_processor_id(), mm) != 0) {
146 tx39_flush_cache_all();
150 static void tx39_flush_cache_range(struct vm_area_struct *vma,
151 unsigned long start, unsigned long end)
155 if (!(cpu_context(smp_processor_id(), vma->vm_mm)))
158 exec = vma->vm_flags & VM_EXEC;
159 if (cpu_has_dc_aliases || exec)
165 static void tx39_flush_cache_page(struct vm_area_struct *vma, unsigned long page, unsigned long pfn)
167 int exec = vma->vm_flags & VM_EXEC;
168 struct mm_struct *mm = vma->vm_mm;
175 * If ownes no valid ASID yet, cannot possibly have gotten
176 * this page into the cache.
178 if (cpu_context(smp_processor_id(), mm) == 0)
182 pgdp = pgd_offset(mm, page);
183 pudp = pud_offset(pgdp, page);
184 pmdp = pmd_offset(pudp, page);
185 ptep = pte_offset(pmdp, page);
188 * If the page isn't marked valid, the page cannot possibly be
191 if (!(pte_val(*ptep) & _PAGE_PRESENT))
195 * Doing flushes for another ASID than the current one is
196 * too difficult since stupid R4k caches do a TLB translation
197 * for every cache flush operation. So we do indexed flushes
198 * in that case, which doesn't overly flush the cache too much.
200 if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) {
201 if (cpu_has_dc_aliases || exec)
202 tx39_blast_dcache_page(page);
204 tx39_blast_icache_page(page);
210 * Do indexed flush, too much work to get the (possible) TLB refills
213 if (cpu_has_dc_aliases || exec)
214 tx39_blast_dcache_page_indexed(page);
216 tx39_blast_icache_page_indexed(page);
219 static void local_tx39_flush_data_cache_page(void * addr)
221 tx39_blast_dcache_page(addr);
224 static void tx39_flush_data_cache_page(unsigned long addr)
226 tx39_blast_dcache_page(addr);
229 static void tx39_flush_icache_range(unsigned long start, unsigned long end)
231 if (end - start > dcache_size)
234 protected_blast_dcache_range(start, end);
236 if (end - start > icache_size)
239 unsigned long flags, config;
240 /* disable icache (set ICE#) */
241 local_irq_save(flags);
242 config = read_c0_conf();
243 write_c0_conf(config & ~TX39_CONF_ICE);
244 TX39_STOP_STREAMING();
245 protected_blast_icache_range(start, end);
246 write_c0_conf(config);
247 local_irq_restore(flags);
252 * Ok, this seriously sucks. We use them to flush a user page but don't
253 * know the virtual address, so we have to blast away the whole icache
254 * which is significantly more expensive than the real thing. Otoh we at
255 * least know the kernel address of the page so we can flush it
258 static void tx39_flush_icache_page(struct vm_area_struct *vma, struct page *page)
262 * If there's no context yet, or the page isn't executable, no icache
265 if (!(vma->vm_flags & VM_EXEC))
268 addr = (unsigned long) page_address(page);
269 tx39_blast_dcache_page(addr);
272 * We're not sure of the virtual address(es) involved here, so
273 * we have to flush the entire I-cache.
278 static void tx39_dma_cache_wback_inv(unsigned long addr, unsigned long size)
282 if (((size | addr) & (PAGE_SIZE - 1)) == 0) {
285 tx39_blast_dcache_page(addr);
287 } while(addr != end);
288 } else if (size > dcache_size) {
291 blast_dcache_range(addr, addr + size);
295 static void tx39_dma_cache_inv(unsigned long addr, unsigned long size)
299 if (((size | addr) & (PAGE_SIZE - 1)) == 0) {
302 tx39_blast_dcache_page(addr);
304 } while(addr != end);
305 } else if (size > dcache_size) {
308 blast_inv_dcache_range(addr, addr + size);
312 static void tx39_flush_cache_sigtramp(unsigned long addr)
314 unsigned long ic_lsize = current_cpu_data.icache.linesz;
315 unsigned long dc_lsize = current_cpu_data.dcache.linesz;
316 unsigned long config;
319 protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
321 /* disable icache (set ICE#) */
322 local_irq_save(flags);
323 config = read_c0_conf();
324 write_c0_conf(config & ~TX39_CONF_ICE);
325 TX39_STOP_STREAMING();
326 protected_flush_icache_line(addr & ~(ic_lsize - 1));
327 write_c0_conf(config);
328 local_irq_restore(flags);
331 static __init void tx39_probe_cache(void)
333 unsigned long config;
335 config = read_c0_conf();
337 icache_size = 1 << (10 + ((config & TX39_CONF_ICS_MASK) >>
338 TX39_CONF_ICS_SHIFT));
339 dcache_size = 1 << (10 + ((config & TX39_CONF_DCS_MASK) >>
340 TX39_CONF_DCS_SHIFT));
342 current_cpu_data.icache.linesz = 16;
343 switch (current_cpu_data.cputype) {
345 current_cpu_data.icache.ways = 1;
346 current_cpu_data.dcache.ways = 1;
347 current_cpu_data.dcache.linesz = 4;
351 current_cpu_data.icache.ways = 2;
352 current_cpu_data.dcache.ways = 2;
353 current_cpu_data.dcache.linesz = 16;
358 current_cpu_data.icache.ways = 1;
359 current_cpu_data.dcache.ways = 1;
360 current_cpu_data.dcache.linesz = 16;
365 void __init tx39_cache_init(void)
367 extern void build_clear_page(void);
368 extern void build_copy_page(void);
369 unsigned long config;
371 config = read_c0_conf();
372 config &= ~TX39_CONF_WBON;
373 write_c0_conf(config);
377 switch (current_cpu_data.cputype) {
379 /* TX39/H core (writethru direct-map cache) */
380 flush_cache_all = tx39h_flush_icache_all;
381 __flush_cache_all = tx39h_flush_icache_all;
382 flush_cache_mm = (void *) tx39h_flush_icache_all;
383 flush_cache_range = (void *) tx39h_flush_icache_all;
384 flush_cache_page = (void *) tx39h_flush_icache_all;
385 flush_icache_page = (void *) tx39h_flush_icache_all;
386 flush_icache_range = (void *) tx39h_flush_icache_all;
388 flush_cache_sigtramp = (void *) tx39h_flush_icache_all;
389 local_flush_data_cache_page = (void *) tx39h_flush_icache_all;
390 flush_data_cache_page = (void *) tx39h_flush_icache_all;
392 _dma_cache_wback_inv = tx39h_dma_cache_wback_inv;
394 shm_align_mask = PAGE_SIZE - 1;
401 /* TX39/H2,H3 core (writeback 2way-set-associative cache) */
402 r3k_have_wired_reg = 1;
403 write_c0_wired(0); /* set 8 on reset... */
404 /* board-dependent init code may set WBON */
406 flush_cache_all = tx39_flush_cache_all;
407 __flush_cache_all = tx39___flush_cache_all;
408 flush_cache_mm = tx39_flush_cache_mm;
409 flush_cache_range = tx39_flush_cache_range;
410 flush_cache_page = tx39_flush_cache_page;
411 flush_icache_page = tx39_flush_icache_page;
412 flush_icache_range = tx39_flush_icache_range;
414 flush_cache_sigtramp = tx39_flush_cache_sigtramp;
415 local_flush_data_cache_page = local_tx39_flush_data_cache_page;
416 flush_data_cache_page = tx39_flush_data_cache_page;
418 _dma_cache_wback_inv = tx39_dma_cache_wback_inv;
419 _dma_cache_wback = tx39_dma_cache_wback_inv;
420 _dma_cache_inv = tx39_dma_cache_inv;
422 shm_align_mask = max_t(unsigned long,
423 (dcache_size / current_cpu_data.dcache.ways) - 1,
429 current_cpu_data.icache.waysize = icache_size / current_cpu_data.icache.ways;
430 current_cpu_data.dcache.waysize = dcache_size / current_cpu_data.dcache.ways;
432 current_cpu_data.icache.sets =
433 current_cpu_data.icache.waysize / current_cpu_data.icache.linesz;
434 current_cpu_data.dcache.sets =
435 current_cpu_data.dcache.waysize / current_cpu_data.dcache.linesz;
437 if (current_cpu_data.dcache.waysize > PAGE_SIZE)
438 current_cpu_data.dcache.flags |= MIPS_CACHE_ALIASES;
440 current_cpu_data.icache.waybit = 0;
441 current_cpu_data.dcache.waybit = 0;
443 printk("Primary instruction cache %ldkB, linesize %d bytes\n",
444 icache_size >> 10, current_cpu_data.icache.linesz);
445 printk("Primary data cache %ldkB, linesize %d bytes\n",
446 dcache_size >> 10, current_cpu_data.dcache.linesz);
450 tx39h_flush_icache_all();