1 /*
2 * r2300.c: R2000 and R3000 specific mmu/cache code.
3 *
4 * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
5 *
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
10 */
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/sched.h>
14 #include <linux/smp.h>
15 #include <linux/mm.h>
16
17 #include <asm/cacheops.h>
18 #include <asm/page.h>
19 #include <asm/pgtable.h>
20 #include <asm/mmu_context.h>
21 #include <asm/system.h>
22 #include <asm/isadep.h>
23 #include <asm/io.h>
24 #include <asm/bootinfo.h>
25 #include <asm/cpu.h>
26
27 /* For R3000 cores with R4000 style caches */
28 static unsigned long icache_size, dcache_size; /* Size in bytes */
29
30 #include <asm/r4kcache.h>
31
32 extern int r3k_have_wired_reg; /* in r3k-tlb.c */
33
34 /* This sequence is required to ensure icache is disabled immediately */
35 #define TX39_STOP_STREAMING() \
36 __asm__ __volatile__( \
37 ".set push\n\t" \
38 ".set noreorder\n\t" \
39 "b 1f\n\t" \
40 "nop\n\t" \
41 "1:\n\t" \
42 ".set pop" \
43 )
44
45 /* TX39H-style cache flush routines. */
tx39h_flush_icache_all(void)46 static void tx39h_flush_icache_all(void)
47 {
48 unsigned long flags, config;
49
50 /* disable icache (set ICE#) */
51 local_irq_save(flags);
52 config = read_c0_conf();
53 write_c0_conf(config & ~TX39_CONF_ICE);
54 TX39_STOP_STREAMING();
55 blast_icache16();
56 write_c0_conf(config);
57 local_irq_restore(flags);
58 }
59
tx39h_dma_cache_wback_inv(unsigned long addr,unsigned long size)60 static void tx39h_dma_cache_wback_inv(unsigned long addr, unsigned long size)
61 {
62 /* Catch bad driver code */
63 BUG_ON(size == 0);
64
65 iob();
66 blast_inv_dcache_range(addr, addr + size);
67 }
68
69
70 /* TX39H2,TX39H3 */
tx39_blast_dcache_page(unsigned long addr)71 static inline void tx39_blast_dcache_page(unsigned long addr)
72 {
73 if (current_cpu_type() != CPU_TX3912)
74 blast_dcache16_page(addr);
75 }
76
tx39_blast_dcache_page_indexed(unsigned long addr)77 static inline void tx39_blast_dcache_page_indexed(unsigned long addr)
78 {
79 blast_dcache16_page_indexed(addr);
80 }
81
tx39_blast_dcache(void)82 static inline void tx39_blast_dcache(void)
83 {
84 blast_dcache16();
85 }
86
tx39_blast_icache_page(unsigned long addr)87 static inline void tx39_blast_icache_page(unsigned long addr)
88 {
89 unsigned long flags, config;
90 /* disable icache (set ICE#) */
91 local_irq_save(flags);
92 config = read_c0_conf();
93 write_c0_conf(config & ~TX39_CONF_ICE);
94 TX39_STOP_STREAMING();
95 blast_icache16_page(addr);
96 write_c0_conf(config);
97 local_irq_restore(flags);
98 }
99
tx39_blast_icache_page_indexed(unsigned long addr)100 static inline void tx39_blast_icache_page_indexed(unsigned long addr)
101 {
102 unsigned long flags, config;
103 /* disable icache (set ICE#) */
104 local_irq_save(flags);
105 config = read_c0_conf();
106 write_c0_conf(config & ~TX39_CONF_ICE);
107 TX39_STOP_STREAMING();
108 blast_icache16_page_indexed(addr);
109 write_c0_conf(config);
110 local_irq_restore(flags);
111 }
112
tx39_blast_icache(void)113 static inline void tx39_blast_icache(void)
114 {
115 unsigned long flags, config;
116 /* disable icache (set ICE#) */
117 local_irq_save(flags);
118 config = read_c0_conf();
119 write_c0_conf(config & ~TX39_CONF_ICE);
120 TX39_STOP_STREAMING();
121 blast_icache16();
122 write_c0_conf(config);
123 local_irq_restore(flags);
124 }
125
tx39__flush_cache_vmap(void)126 static void tx39__flush_cache_vmap(void)
127 {
128 tx39_blast_dcache();
129 }
130
tx39__flush_cache_vunmap(void)131 static void tx39__flush_cache_vunmap(void)
132 {
133 tx39_blast_dcache();
134 }
135
tx39_flush_cache_all(void)136 static inline void tx39_flush_cache_all(void)
137 {
138 if (!cpu_has_dc_aliases)
139 return;
140
141 tx39_blast_dcache();
142 }
143
tx39___flush_cache_all(void)144 static inline void tx39___flush_cache_all(void)
145 {
146 tx39_blast_dcache();
147 tx39_blast_icache();
148 }
149
tx39_flush_cache_mm(struct mm_struct * mm)150 static void tx39_flush_cache_mm(struct mm_struct *mm)
151 {
152 if (!cpu_has_dc_aliases)
153 return;
154
155 if (cpu_context(smp_processor_id(), mm) != 0)
156 tx39_blast_dcache();
157 }
158
tx39_flush_cache_range(struct vm_area_struct * vma,unsigned long start,unsigned long end)159 static void tx39_flush_cache_range(struct vm_area_struct *vma,
160 unsigned long start, unsigned long end)
161 {
162 if (!cpu_has_dc_aliases)
163 return;
164 if (!(cpu_context(smp_processor_id(), vma->vm_mm)))
165 return;
166
167 tx39_blast_dcache();
168 }
169
tx39_flush_cache_page(struct vm_area_struct * vma,unsigned long page,unsigned long pfn)170 static void tx39_flush_cache_page(struct vm_area_struct *vma, unsigned long page, unsigned long pfn)
171 {
172 int exec = vma->vm_flags & VM_EXEC;
173 struct mm_struct *mm = vma->vm_mm;
174 pgd_t *pgdp;
175 pud_t *pudp;
176 pmd_t *pmdp;
177 pte_t *ptep;
178
179 /*
180 * If ownes no valid ASID yet, cannot possibly have gotten
181 * this page into the cache.
182 */
183 if (cpu_context(smp_processor_id(), mm) == 0)
184 return;
185
186 page &= PAGE_MASK;
187 pgdp = pgd_offset(mm, page);
188 pudp = pud_offset(pgdp, page);
189 pmdp = pmd_offset(pudp, page);
190 ptep = pte_offset(pmdp, page);
191
192 /*
193 * If the page isn't marked valid, the page cannot possibly be
194 * in the cache.
195 */
196 if (!(pte_val(*ptep) & _PAGE_PRESENT))
197 return;
198
199 /*
200 * Doing flushes for another ASID than the current one is
201 * too difficult since stupid R4k caches do a TLB translation
202 * for every cache flush operation. So we do indexed flushes
203 * in that case, which doesn't overly flush the cache too much.
204 */
205 if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) {
206 if (cpu_has_dc_aliases || exec)
207 tx39_blast_dcache_page(page);
208 if (exec)
209 tx39_blast_icache_page(page);
210
211 return;
212 }
213
214 /*
215 * Do indexed flush, too much work to get the (possible) TLB refills
216 * to work correctly.
217 */
218 if (cpu_has_dc_aliases || exec)
219 tx39_blast_dcache_page_indexed(page);
220 if (exec)
221 tx39_blast_icache_page_indexed(page);
222 }
223
local_tx39_flush_data_cache_page(void * addr)224 static void local_tx39_flush_data_cache_page(void * addr)
225 {
226 tx39_blast_dcache_page((unsigned long)addr);
227 }
228
tx39_flush_data_cache_page(unsigned long addr)229 static void tx39_flush_data_cache_page(unsigned long addr)
230 {
231 tx39_blast_dcache_page(addr);
232 }
233
tx39_flush_icache_range(unsigned long start,unsigned long end)234 static void tx39_flush_icache_range(unsigned long start, unsigned long end)
235 {
236 if (end - start > dcache_size)
237 tx39_blast_dcache();
238 else
239 protected_blast_dcache_range(start, end);
240
241 if (end - start > icache_size)
242 tx39_blast_icache();
243 else {
244 unsigned long flags, config;
245 /* disable icache (set ICE#) */
246 local_irq_save(flags);
247 config = read_c0_conf();
248 write_c0_conf(config & ~TX39_CONF_ICE);
249 TX39_STOP_STREAMING();
250 protected_blast_icache_range(start, end);
251 write_c0_conf(config);
252 local_irq_restore(flags);
253 }
254 }
255
tx39_dma_cache_wback_inv(unsigned long addr,unsigned long size)256 static void tx39_dma_cache_wback_inv(unsigned long addr, unsigned long size)
257 {
258 unsigned long end;
259
260 if (((size | addr) & (PAGE_SIZE - 1)) == 0) {
261 end = addr + size;
262 do {
263 tx39_blast_dcache_page(addr);
264 addr += PAGE_SIZE;
265 } while(addr != end);
266 } else if (size > dcache_size) {
267 tx39_blast_dcache();
268 } else {
269 blast_dcache_range(addr, addr + size);
270 }
271 }
272
tx39_dma_cache_inv(unsigned long addr,unsigned long size)273 static void tx39_dma_cache_inv(unsigned long addr, unsigned long size)
274 {
275 unsigned long end;
276
277 if (((size | addr) & (PAGE_SIZE - 1)) == 0) {
278 end = addr + size;
279 do {
280 tx39_blast_dcache_page(addr);
281 addr += PAGE_SIZE;
282 } while(addr != end);
283 } else if (size > dcache_size) {
284 tx39_blast_dcache();
285 } else {
286 blast_inv_dcache_range(addr, addr + size);
287 }
288 }
289
tx39_flush_cache_sigtramp(unsigned long addr)290 static void tx39_flush_cache_sigtramp(unsigned long addr)
291 {
292 unsigned long ic_lsize = current_cpu_data.icache.linesz;
293 unsigned long dc_lsize = current_cpu_data.dcache.linesz;
294 unsigned long config;
295 unsigned long flags;
296
297 protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
298
299 /* disable icache (set ICE#) */
300 local_irq_save(flags);
301 config = read_c0_conf();
302 write_c0_conf(config & ~TX39_CONF_ICE);
303 TX39_STOP_STREAMING();
304 protected_flush_icache_line(addr & ~(ic_lsize - 1));
305 write_c0_conf(config);
306 local_irq_restore(flags);
307 }
308
tx39_probe_cache(void)309 static __init void tx39_probe_cache(void)
310 {
311 unsigned long config;
312
313 config = read_c0_conf();
314
315 icache_size = 1 << (10 + ((config & TX39_CONF_ICS_MASK) >>
316 TX39_CONF_ICS_SHIFT));
317 dcache_size = 1 << (10 + ((config & TX39_CONF_DCS_MASK) >>
318 TX39_CONF_DCS_SHIFT));
319
320 current_cpu_data.icache.linesz = 16;
321 switch (current_cpu_type()) {
322 case CPU_TX3912:
323 current_cpu_data.icache.ways = 1;
324 current_cpu_data.dcache.ways = 1;
325 current_cpu_data.dcache.linesz = 4;
326 break;
327
328 case CPU_TX3927:
329 current_cpu_data.icache.ways = 2;
330 current_cpu_data.dcache.ways = 2;
331 current_cpu_data.dcache.linesz = 16;
332 break;
333
334 case CPU_TX3922:
335 default:
336 current_cpu_data.icache.ways = 1;
337 current_cpu_data.dcache.ways = 1;
338 current_cpu_data.dcache.linesz = 16;
339 break;
340 }
341 }
342
tx39_cache_init(void)343 void __cpuinit tx39_cache_init(void)
344 {
345 extern void build_clear_page(void);
346 extern void build_copy_page(void);
347 unsigned long config;
348
349 config = read_c0_conf();
350 config &= ~TX39_CONF_WBON;
351 write_c0_conf(config);
352
353 tx39_probe_cache();
354
355 switch (current_cpu_type()) {
356 case CPU_TX3912:
357 /* TX39/H core (writethru direct-map cache) */
358 __flush_cache_vmap = tx39__flush_cache_vmap;
359 __flush_cache_vunmap = tx39__flush_cache_vunmap;
360 flush_cache_all = tx39h_flush_icache_all;
361 __flush_cache_all = tx39h_flush_icache_all;
362 flush_cache_mm = (void *) tx39h_flush_icache_all;
363 flush_cache_range = (void *) tx39h_flush_icache_all;
364 flush_cache_page = (void *) tx39h_flush_icache_all;
365 flush_icache_range = (void *) tx39h_flush_icache_all;
366 local_flush_icache_range = (void *) tx39h_flush_icache_all;
367
368 flush_cache_sigtramp = (void *) tx39h_flush_icache_all;
369 local_flush_data_cache_page = (void *) tx39h_flush_icache_all;
370 flush_data_cache_page = (void *) tx39h_flush_icache_all;
371
372 _dma_cache_wback_inv = tx39h_dma_cache_wback_inv;
373
374 shm_align_mask = PAGE_SIZE - 1;
375
376 break;
377
378 case CPU_TX3922:
379 case CPU_TX3927:
380 default:
381 /* TX39/H2,H3 core (writeback 2way-set-associative cache) */
382 r3k_have_wired_reg = 1;
383 write_c0_wired(0); /* set 8 on reset... */
384 /* board-dependent init code may set WBON */
385
386 __flush_cache_vmap = tx39__flush_cache_vmap;
387 __flush_cache_vunmap = tx39__flush_cache_vunmap;
388
389 flush_cache_all = tx39_flush_cache_all;
390 __flush_cache_all = tx39___flush_cache_all;
391 flush_cache_mm = tx39_flush_cache_mm;
392 flush_cache_range = tx39_flush_cache_range;
393 flush_cache_page = tx39_flush_cache_page;
394 flush_icache_range = tx39_flush_icache_range;
395 local_flush_icache_range = tx39_flush_icache_range;
396
397 flush_cache_sigtramp = tx39_flush_cache_sigtramp;
398 local_flush_data_cache_page = local_tx39_flush_data_cache_page;
399 flush_data_cache_page = tx39_flush_data_cache_page;
400
401 _dma_cache_wback_inv = tx39_dma_cache_wback_inv;
402 _dma_cache_wback = tx39_dma_cache_wback_inv;
403 _dma_cache_inv = tx39_dma_cache_inv;
404
405 shm_align_mask = max_t(unsigned long,
406 (dcache_size / current_cpu_data.dcache.ways) - 1,
407 PAGE_SIZE - 1);
408
409 break;
410 }
411
412 current_cpu_data.icache.waysize = icache_size / current_cpu_data.icache.ways;
413 current_cpu_data.dcache.waysize = dcache_size / current_cpu_data.dcache.ways;
414
415 current_cpu_data.icache.sets =
416 current_cpu_data.icache.waysize / current_cpu_data.icache.linesz;
417 current_cpu_data.dcache.sets =
418 current_cpu_data.dcache.waysize / current_cpu_data.dcache.linesz;
419
420 if (current_cpu_data.dcache.waysize > PAGE_SIZE)
421 current_cpu_data.dcache.flags |= MIPS_CACHE_ALIASES;
422
423 current_cpu_data.icache.waybit = 0;
424 current_cpu_data.dcache.waybit = 0;
425
426 printk("Primary instruction cache %ldkB, linesize %d bytes\n",
427 icache_size >> 10, current_cpu_data.icache.linesz);
428 printk("Primary data cache %ldkB, linesize %d bytes\n",
429 dcache_size >> 10, current_cpu_data.dcache.linesz);
430
431 build_clear_page();
432 build_copy_page();
433 tx39h_flush_icache_all();
434 }
435