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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/mm/proc-arm1026.S: MMU functions for ARM1026EJ-S | |
3 | * | |
4 | * Copyright (C) 2000 ARM Limited | |
5 | * Copyright (C) 2000 Deep Blue Solutions Ltd. | |
d090ddda | 6 | * hacked for non-paged-MM by Hyok S. Choi, 2003. |
1da177e4 LT |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * | |
14 | * These are the low level assembler for performing cache and TLB | |
15 | * functions on the ARM1026EJ-S. | |
16 | */ | |
17 | #include <linux/linkage.h> | |
1da177e4 LT |
18 | #include <linux/init.h> |
19 | #include <asm/assembler.h> | |
e6ae744d | 20 | #include <asm/asm-offsets.h> |
5ec9407d | 21 | #include <asm/hwcap.h> |
74945c86 | 22 | #include <asm/pgtable-hwdef.h> |
1da177e4 | 23 | #include <asm/pgtable.h> |
1da177e4 LT |
24 | #include <asm/ptrace.h> |
25 | ||
00eb0f6b RK |
26 | #include "proc-macros.S" |
27 | ||
1da177e4 LT |
28 | /* |
29 | * This is the maximum size of an area which will be invalidated | |
30 | * using the single invalidate entry instructions. Anything larger | |
31 | * than this, and we go for the whole cache. | |
32 | * | |
33 | * This value should be chosen such that we choose the cheapest | |
34 | * alternative. | |
35 | */ | |
36 | #define MAX_AREA_SIZE 32768 | |
37 | ||
38 | /* | |
39 | * The size of one data cache line. | |
40 | */ | |
41 | #define CACHE_DLINESIZE 32 | |
42 | ||
43 | /* | |
44 | * The number of data cache segments. | |
45 | */ | |
46 | #define CACHE_DSEGMENTS 16 | |
47 | ||
48 | /* | |
49 | * The number of lines in a cache segment. | |
50 | */ | |
51 | #define CACHE_DENTRIES 64 | |
52 | ||
53 | /* | |
54 | * This is the size at which it becomes more efficient to | |
55 | * clean the whole cache, rather than using the individual | |
56 | * cache line maintainence instructions. | |
57 | */ | |
58 | #define CACHE_DLIMIT 32768 | |
59 | ||
60 | .text | |
61 | /* | |
62 | * cpu_arm1026_proc_init() | |
63 | */ | |
64 | ENTRY(cpu_arm1026_proc_init) | |
65 | mov pc, lr | |
66 | ||
67 | /* | |
68 | * cpu_arm1026_proc_fin() | |
69 | */ | |
70 | ENTRY(cpu_arm1026_proc_fin) | |
1da177e4 LT |
71 | mrc p15, 0, r0, c1, c0, 0 @ ctrl register |
72 | bic r0, r0, #0x1000 @ ...i............ | |
73 | bic r0, r0, #0x000e @ ............wca. | |
74 | mcr p15, 0, r0, c1, c0, 0 @ disable caches | |
9ca03a21 | 75 | mov pc, lr |
1da177e4 LT |
76 | |
77 | /* | |
78 | * cpu_arm1026_reset(loc) | |
79 | * | |
80 | * Perform a soft reset of the system. Put the CPU into the | |
81 | * same state as it would be if it had been reset, and branch | |
82 | * to what would be the reset vector. | |
83 | * | |
84 | * loc: location to jump to for soft reset | |
85 | */ | |
86 | .align 5 | |
87 | ENTRY(cpu_arm1026_reset) | |
88 | mov ip, #0 | |
89 | mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches | |
90 | mcr p15, 0, ip, c7, c10, 4 @ drain WB | |
d090ddda | 91 | #ifdef CONFIG_MMU |
1da177e4 | 92 | mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs |
d090ddda | 93 | #endif |
1da177e4 LT |
94 | mrc p15, 0, ip, c1, c0, 0 @ ctrl register |
95 | bic ip, ip, #0x000f @ ............wcam | |
96 | bic ip, ip, #0x1100 @ ...i...s........ | |
97 | mcr p15, 0, ip, c1, c0, 0 @ ctrl register | |
98 | mov pc, r0 | |
99 | ||
100 | /* | |
101 | * cpu_arm1026_do_idle() | |
102 | */ | |
103 | .align 5 | |
104 | ENTRY(cpu_arm1026_do_idle) | |
105 | mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt | |
106 | mov pc, lr | |
107 | ||
108 | /* ================================= CACHE ================================ */ | |
109 | ||
110 | .align 5 | |
c8c90860 MW |
111 | |
112 | /* | |
113 | * flush_icache_all() | |
114 | * | |
115 | * Unconditionally clean and invalidate the entire icache. | |
116 | */ | |
117 | ENTRY(arm1026_flush_icache_all) | |
118 | #ifndef CONFIG_CPU_ICACHE_DISABLE | |
119 | mov r0, #0 | |
120 | mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache | |
121 | #endif | |
122 | mov pc, lr | |
123 | ENDPROC(arm1026_flush_icache_all) | |
124 | ||
1da177e4 LT |
125 | /* |
126 | * flush_user_cache_all() | |
127 | * | |
128 | * Invalidate all cache entries in a particular address | |
129 | * space. | |
130 | */ | |
131 | ENTRY(arm1026_flush_user_cache_all) | |
132 | /* FALLTHROUGH */ | |
133 | /* | |
134 | * flush_kern_cache_all() | |
135 | * | |
136 | * Clean and invalidate the entire cache. | |
137 | */ | |
138 | ENTRY(arm1026_flush_kern_cache_all) | |
139 | mov r2, #VM_EXEC | |
140 | mov ip, #0 | |
141 | __flush_whole_cache: | |
142 | #ifndef CONFIG_CPU_DCACHE_DISABLE | |
143 | 1: mrc p15, 0, r15, c7, c14, 3 @ test, clean, invalidate | |
144 | bne 1b | |
145 | #endif | |
146 | tst r2, #VM_EXEC | |
147 | #ifndef CONFIG_CPU_ICACHE_DISABLE | |
148 | mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache | |
149 | #endif | |
150 | mcrne p15, 0, ip, c7, c10, 4 @ drain WB | |
151 | mov pc, lr | |
152 | ||
153 | /* | |
154 | * flush_user_cache_range(start, end, flags) | |
155 | * | |
156 | * Invalidate a range of cache entries in the specified | |
157 | * address space. | |
158 | * | |
159 | * - start - start address (inclusive) | |
160 | * - end - end address (exclusive) | |
161 | * - flags - vm_flags for this space | |
162 | */ | |
163 | ENTRY(arm1026_flush_user_cache_range) | |
164 | mov ip, #0 | |
165 | sub r3, r1, r0 @ calculate total size | |
166 | cmp r3, #CACHE_DLIMIT | |
167 | bhs __flush_whole_cache | |
168 | ||
169 | #ifndef CONFIG_CPU_DCACHE_DISABLE | |
170 | 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry | |
171 | add r0, r0, #CACHE_DLINESIZE | |
172 | cmp r0, r1 | |
173 | blo 1b | |
174 | #endif | |
175 | tst r2, #VM_EXEC | |
176 | #ifndef CONFIG_CPU_ICACHE_DISABLE | |
177 | mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache | |
178 | #endif | |
179 | mcrne p15, 0, ip, c7, c10, 4 @ drain WB | |
180 | mov pc, lr | |
181 | ||
182 | /* | |
183 | * coherent_kern_range(start, end) | |
184 | * | |
185 | * Ensure coherency between the Icache and the Dcache in the | |
186 | * region described by start. If you have non-snooping | |
187 | * Harvard caches, you need to implement this function. | |
188 | * | |
189 | * - start - virtual start address | |
190 | * - end - virtual end address | |
191 | */ | |
192 | ENTRY(arm1026_coherent_kern_range) | |
193 | /* FALLTHROUGH */ | |
194 | /* | |
195 | * coherent_user_range(start, end) | |
196 | * | |
197 | * Ensure coherency between the Icache and the Dcache in the | |
198 | * region described by start. If you have non-snooping | |
199 | * Harvard caches, you need to implement this function. | |
200 | * | |
201 | * - start - virtual start address | |
202 | * - end - virtual end address | |
203 | */ | |
204 | ENTRY(arm1026_coherent_user_range) | |
205 | mov ip, #0 | |
206 | bic r0, r0, #CACHE_DLINESIZE - 1 | |
207 | 1: | |
208 | #ifndef CONFIG_CPU_DCACHE_DISABLE | |
209 | mcr p15, 0, r0, c7, c10, 1 @ clean D entry | |
210 | #endif | |
211 | #ifndef CONFIG_CPU_ICACHE_DISABLE | |
212 | mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry | |
213 | #endif | |
214 | add r0, r0, #CACHE_DLINESIZE | |
215 | cmp r0, r1 | |
216 | blo 1b | |
217 | mcr p15, 0, ip, c7, c10, 4 @ drain WB | |
218 | mov pc, lr | |
219 | ||
220 | /* | |
2c9b9c84 | 221 | * flush_kern_dcache_area(void *addr, size_t size) |
1da177e4 LT |
222 | * |
223 | * Ensure no D cache aliasing occurs, either with itself or | |
224 | * the I cache | |
225 | * | |
2c9b9c84 RK |
226 | * - addr - kernel address |
227 | * - size - region size | |
1da177e4 | 228 | */ |
2c9b9c84 | 229 | ENTRY(arm1026_flush_kern_dcache_area) |
1da177e4 LT |
230 | mov ip, #0 |
231 | #ifndef CONFIG_CPU_DCACHE_DISABLE | |
2c9b9c84 | 232 | add r1, r0, r1 |
1da177e4 LT |
233 | 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry |
234 | add r0, r0, #CACHE_DLINESIZE | |
235 | cmp r0, r1 | |
236 | blo 1b | |
237 | #endif | |
238 | mcr p15, 0, ip, c7, c10, 4 @ drain WB | |
239 | mov pc, lr | |
240 | ||
241 | /* | |
242 | * dma_inv_range(start, end) | |
243 | * | |
244 | * Invalidate (discard) the specified virtual address range. | |
245 | * May not write back any entries. If 'start' or 'end' | |
246 | * are not cache line aligned, those lines must be written | |
247 | * back. | |
248 | * | |
249 | * - start - virtual start address | |
250 | * - end - virtual end address | |
251 | * | |
252 | * (same as v4wb) | |
253 | */ | |
702b94bf | 254 | arm1026_dma_inv_range: |
1da177e4 LT |
255 | mov ip, #0 |
256 | #ifndef CONFIG_CPU_DCACHE_DISABLE | |
257 | tst r0, #CACHE_DLINESIZE - 1 | |
258 | bic r0, r0, #CACHE_DLINESIZE - 1 | |
259 | mcrne p15, 0, r0, c7, c10, 1 @ clean D entry | |
260 | tst r1, #CACHE_DLINESIZE - 1 | |
261 | mcrne p15, 0, r1, c7, c10, 1 @ clean D entry | |
262 | 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry | |
263 | add r0, r0, #CACHE_DLINESIZE | |
264 | cmp r0, r1 | |
265 | blo 1b | |
266 | #endif | |
267 | mcr p15, 0, ip, c7, c10, 4 @ drain WB | |
268 | mov pc, lr | |
269 | ||
270 | /* | |
271 | * dma_clean_range(start, end) | |
272 | * | |
273 | * Clean the specified virtual address range. | |
274 | * | |
275 | * - start - virtual start address | |
276 | * - end - virtual end address | |
277 | * | |
278 | * (same as v4wb) | |
279 | */ | |
702b94bf | 280 | arm1026_dma_clean_range: |
1da177e4 LT |
281 | mov ip, #0 |
282 | #ifndef CONFIG_CPU_DCACHE_DISABLE | |
283 | bic r0, r0, #CACHE_DLINESIZE - 1 | |
284 | 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry | |
285 | add r0, r0, #CACHE_DLINESIZE | |
286 | cmp r0, r1 | |
287 | blo 1b | |
288 | #endif | |
289 | mcr p15, 0, ip, c7, c10, 4 @ drain WB | |
290 | mov pc, lr | |
291 | ||
292 | /* | |
293 | * dma_flush_range(start, end) | |
294 | * | |
295 | * Clean and invalidate the specified virtual address range. | |
296 | * | |
297 | * - start - virtual start address | |
298 | * - end - virtual end address | |
299 | */ | |
300 | ENTRY(arm1026_dma_flush_range) | |
301 | mov ip, #0 | |
302 | #ifndef CONFIG_CPU_DCACHE_DISABLE | |
303 | bic r0, r0, #CACHE_DLINESIZE - 1 | |
304 | 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry | |
305 | add r0, r0, #CACHE_DLINESIZE | |
306 | cmp r0, r1 | |
307 | blo 1b | |
308 | #endif | |
309 | mcr p15, 0, ip, c7, c10, 4 @ drain WB | |
310 | mov pc, lr | |
311 | ||
a9c9147e RK |
312 | /* |
313 | * dma_map_area(start, size, dir) | |
314 | * - start - kernel virtual start address | |
315 | * - size - size of region | |
316 | * - dir - DMA direction | |
317 | */ | |
318 | ENTRY(arm1026_dma_map_area) | |
319 | add r1, r1, r0 | |
320 | cmp r2, #DMA_TO_DEVICE | |
321 | beq arm1026_dma_clean_range | |
322 | bcs arm1026_dma_inv_range | |
323 | b arm1026_dma_flush_range | |
324 | ENDPROC(arm1026_dma_map_area) | |
325 | ||
326 | /* | |
327 | * dma_unmap_area(start, size, dir) | |
328 | * - start - kernel virtual start address | |
329 | * - size - size of region | |
330 | * - dir - DMA direction | |
331 | */ | |
332 | ENTRY(arm1026_dma_unmap_area) | |
333 | mov pc, lr | |
334 | ENDPROC(arm1026_dma_unmap_area) | |
335 | ||
1da177e4 | 336 | ENTRY(arm1026_cache_fns) |
c8c90860 | 337 | .long arm1026_flush_icache_all |
1da177e4 LT |
338 | .long arm1026_flush_kern_cache_all |
339 | .long arm1026_flush_user_cache_all | |
340 | .long arm1026_flush_user_cache_range | |
341 | .long arm1026_coherent_kern_range | |
342 | .long arm1026_coherent_user_range | |
2c9b9c84 | 343 | .long arm1026_flush_kern_dcache_area |
a9c9147e RK |
344 | .long arm1026_dma_map_area |
345 | .long arm1026_dma_unmap_area | |
1da177e4 LT |
346 | .long arm1026_dma_flush_range |
347 | ||
348 | .align 5 | |
349 | ENTRY(cpu_arm1026_dcache_clean_area) | |
350 | #ifndef CONFIG_CPU_DCACHE_DISABLE | |
351 | mov ip, #0 | |
352 | 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry | |
353 | add r0, r0, #CACHE_DLINESIZE | |
354 | subs r1, r1, #CACHE_DLINESIZE | |
355 | bhi 1b | |
356 | #endif | |
357 | mov pc, lr | |
358 | ||
359 | /* =============================== PageTable ============================== */ | |
360 | ||
361 | /* | |
362 | * cpu_arm1026_switch_mm(pgd) | |
363 | * | |
364 | * Set the translation base pointer to be as described by pgd. | |
365 | * | |
366 | * pgd: new page tables | |
367 | */ | |
368 | .align 5 | |
369 | ENTRY(cpu_arm1026_switch_mm) | |
d090ddda | 370 | #ifdef CONFIG_MMU |
1da177e4 LT |
371 | mov r1, #0 |
372 | #ifndef CONFIG_CPU_DCACHE_DISABLE | |
373 | 1: mrc p15, 0, r15, c7, c14, 3 @ test, clean, invalidate | |
374 | bne 1b | |
375 | #endif | |
376 | #ifndef CONFIG_CPU_ICACHE_DISABLE | |
377 | mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache | |
378 | #endif | |
379 | mcr p15, 0, r1, c7, c10, 4 @ drain WB | |
380 | mcr p15, 0, r0, c2, c0, 0 @ load page table pointer | |
381 | mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs | |
d090ddda | 382 | #endif |
1da177e4 LT |
383 | mov pc, lr |
384 | ||
385 | /* | |
ad1ae2fe | 386 | * cpu_arm1026_set_pte_ext(ptep, pte, ext) |
1da177e4 LT |
387 | * |
388 | * Set a PTE and flush it out | |
389 | */ | |
390 | .align 5 | |
ad1ae2fe | 391 | ENTRY(cpu_arm1026_set_pte_ext) |
d090ddda | 392 | #ifdef CONFIG_MMU |
da091653 | 393 | armv3_set_pte_ext |
1da177e4 LT |
394 | mov r0, r0 |
395 | #ifndef CONFIG_CPU_DCACHE_DISABLE | |
396 | mcr p15, 0, r0, c7, c10, 1 @ clean D entry | |
397 | #endif | |
d090ddda | 398 | #endif /* CONFIG_MMU */ |
1da177e4 LT |
399 | mov pc, lr |
400 | ||
401 | ||
5085f3ff | 402 | __CPUINIT |
1da177e4 LT |
403 | |
404 | .type __arm1026_setup, #function | |
405 | __arm1026_setup: | |
406 | mov r0, #0 | |
407 | mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4 | |
408 | mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4 | |
d090ddda | 409 | #ifdef CONFIG_MMU |
1da177e4 LT |
410 | mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4 |
411 | mcr p15, 0, r4, c2, c0 @ load page table pointer | |
d090ddda | 412 | #endif |
1da177e4 LT |
413 | #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH |
414 | mov r0, #4 @ explicitly disable writeback | |
415 | mcr p15, 7, r0, c15, c0, 0 | |
416 | #endif | |
22b19086 RK |
417 | adr r5, arm1026_crval |
418 | ldmia r5, {r5, r6} | |
1da177e4 | 419 | mrc p15, 0, r0, c1, c0 @ get control register v4 |
1da177e4 | 420 | bic r0, r0, r5 |
22b19086 | 421 | orr r0, r0, r6 |
1da177e4 LT |
422 | #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN |
423 | orr r0, r0, #0x4000 @ .R.. .... .... .... | |
424 | #endif | |
425 | mov pc, lr | |
426 | .size __arm1026_setup, . - __arm1026_setup | |
427 | ||
428 | /* | |
429 | * R | |
430 | * .RVI ZFRS BLDP WCAM | |
431 | * .011 1001 ..11 0101 | |
432 | * | |
433 | */ | |
22b19086 RK |
434 | .type arm1026_crval, #object |
435 | arm1026_crval: | |
436 | crval clear=0x00007f3f, mmuset=0x00003935, ucset=0x00001934 | |
1da177e4 LT |
437 | |
438 | __INITDATA | |
439 | ||
440 | /* | |
441 | * Purpose : Function pointers used to access above functions - all calls | |
442 | * come through these | |
443 | */ | |
444 | .type arm1026_processor_functions, #object | |
445 | arm1026_processor_functions: | |
446 | .word v5t_early_abort | |
4fb28474 | 447 | .word legacy_pabort |
1da177e4 LT |
448 | .word cpu_arm1026_proc_init |
449 | .word cpu_arm1026_proc_fin | |
450 | .word cpu_arm1026_reset | |
451 | .word cpu_arm1026_do_idle | |
452 | .word cpu_arm1026_dcache_clean_area | |
453 | .word cpu_arm1026_switch_mm | |
ad1ae2fe | 454 | .word cpu_arm1026_set_pte_ext |
1da177e4 LT |
455 | .size arm1026_processor_functions, . - arm1026_processor_functions |
456 | ||
457 | .section .rodata | |
458 | ||
459 | .type cpu_arch_name, #object | |
460 | cpu_arch_name: | |
461 | .asciz "armv5tej" | |
462 | .size cpu_arch_name, . - cpu_arch_name | |
463 | ||
464 | .type cpu_elf_name, #object | |
465 | cpu_elf_name: | |
466 | .asciz "v5" | |
467 | .size cpu_elf_name, . - cpu_elf_name | |
468 | .align | |
469 | ||
470 | .type cpu_arm1026_name, #object | |
471 | cpu_arm1026_name: | |
264edb35 | 472 | .asciz "ARM1026EJ-S" |
1da177e4 LT |
473 | .size cpu_arm1026_name, . - cpu_arm1026_name |
474 | ||
475 | .align | |
476 | ||
02b7dd12 | 477 | .section ".proc.info.init", #alloc, #execinstr |
1da177e4 LT |
478 | |
479 | .type __arm1026_proc_info,#object | |
480 | __arm1026_proc_info: | |
481 | .long 0x4106a260 @ ARM 1026EJ-S (v5TEJ) | |
482 | .long 0xff0ffff0 | |
8799ee9f RK |
483 | .long PMD_TYPE_SECT | \ |
484 | PMD_BIT4 | \ | |
485 | PMD_SECT_AP_WRITE | \ | |
486 | PMD_SECT_AP_READ | |
1da177e4 LT |
487 | .long PMD_TYPE_SECT | \ |
488 | PMD_BIT4 | \ | |
489 | PMD_SECT_AP_WRITE | \ | |
490 | PMD_SECT_AP_READ | |
491 | b __arm1026_setup | |
492 | .long cpu_arch_name | |
493 | .long cpu_elf_name | |
494 | .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_JAVA | |
495 | .long cpu_arm1026_name | |
496 | .long arm1026_processor_functions | |
497 | .long v4wbi_tlb_fns | |
498 | .long v4wb_user_fns | |
499 | .long arm1026_cache_fns | |
500 | .size __arm1026_proc_info, . - __arm1026_proc_info |