1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * linux/arch/arm/mm/proc-arm1020.S: MMU functions for ARM1020
4 *
5 * Copyright (C) 2000 ARM Limited
6 * Copyright (C) 2000 Deep Blue Solutions Ltd.
7 * hacked for non-paged-MM by Hyok S. Choi, 2003.
8 *
9 * These are the low level assembler for performing cache and TLB
10 * functions on the arm1020.
11 */
12 #include <linux/linkage.h>
13 #include <linux/init.h>
14 #include <linux/cfi_types.h>
15 #include <linux/pgtable.h>
16 #include <asm/assembler.h>
17 #include <asm/asm-offsets.h>
18 #include <asm/hwcap.h>
19 #include <asm/pgtable-hwdef.h>
20 #include <asm/ptrace.h>
21
22 #include "proc-macros.S"
23
24 /*
25 * This is the maximum size of an area which will be invalidated
26 * using the single invalidate entry instructions. Anything larger
27 * than this, and we go for the whole cache.
28 *
29 * This value should be chosen such that we choose the cheapest
30 * alternative.
31 */
32 #define MAX_AREA_SIZE 32768
33
34 /*
35 * The size of one data cache line.
36 */
37 #define CACHE_DLINESIZE 32
38
39 /*
40 * The number of data cache segments.
41 */
42 #define CACHE_DSEGMENTS 16
43
44 /*
45 * The number of lines in a cache segment.
46 */
47 #define CACHE_DENTRIES 64
48
49 /*
50 * This is the size at which it becomes more efficient to
51 * clean the whole cache, rather than using the individual
52 * cache line maintenance instructions.
53 */
54 #define CACHE_DLIMIT 32768
55
56 .text
57 /*
58 * cpu_arm1020_proc_init()
59 */
60 SYM_TYPED_FUNC_START(cpu_arm1020_proc_init)
61 ret lr
62 SYM_FUNC_END(cpu_arm1020_proc_init)
63
64 /*
65 * cpu_arm1020_proc_fin()
66 */
67 SYM_TYPED_FUNC_START(cpu_arm1020_proc_fin)
68 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
69 bic r0, r0, #0x1000 @ ...i............
70 bic r0, r0, #0x000e @ ............wca.
71 mcr p15, 0, r0, c1, c0, 0 @ disable caches
72 ret lr
73 SYM_FUNC_END(cpu_arm1020_proc_fin)
74
75 /*
76 * cpu_arm1020_reset(loc)
77 *
78 * Perform a soft reset of the system. Put the CPU into the
79 * same state as it would be if it had been reset, and branch
80 * to what would be the reset vector.
81 *
82 * loc: location to jump to for soft reset
83 */
84 .align 5
85 .pushsection .idmap.text, "ax"
86 SYM_TYPED_FUNC_START(cpu_arm1020_reset)
87 mov ip, #0
88 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
89 mcr p15, 0, ip, c7, c10, 4 @ drain WB
90 #ifdef CONFIG_MMU
91 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
92 #endif
93 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
94 bic ip, ip, #0x000f @ ............wcam
95 bic ip, ip, #0x1100 @ ...i...s........
96 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
97 ret r0
98 SYM_FUNC_END(cpu_arm1020_reset)
99 .popsection
100
101 /*
102 * cpu_arm1020_do_idle()
103 */
104 .align 5
105 SYM_TYPED_FUNC_START(cpu_arm1020_do_idle)
106 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
107 ret lr
108 SYM_FUNC_END(cpu_arm1020_do_idle)
109
110 /* ================================= CACHE ================================ */
111
112 .align 5
113
114 /*
115 * flush_icache_all()
116 *
117 * Unconditionally clean and invalidate the entire icache.
118 */
119 SYM_TYPED_FUNC_START(arm1020_flush_icache_all)
120 #ifndef CONFIG_CPU_ICACHE_DISABLE
121 mov r0, #0
122 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
123 #endif
124 ret lr
125 SYM_FUNC_END(arm1020_flush_icache_all)
126
127 /*
128 * flush_user_cache_all()
129 *
130 * Invalidate all cache entries in a particular address
131 * space.
132 */
133 SYM_FUNC_ALIAS(arm1020_flush_user_cache_all, arm1020_flush_kern_cache_all)
134
135 /*
136 * flush_kern_cache_all()
137 *
138 * Clean and invalidate the entire cache.
139 */
140 SYM_TYPED_FUNC_START(arm1020_flush_kern_cache_all)
141 mov r2, #VM_EXEC
142 mov ip, #0
143 __flush_whole_cache:
144 #ifndef CONFIG_CPU_DCACHE_DISABLE
145 mcr p15, 0, ip, c7, c10, 4 @ drain WB
146 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments
147 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
148 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
149 mcr p15, 0, ip, c7, c10, 4 @ drain WB
150 subs r3, r3, #1 << 26
151 bcs 2b @ entries 63 to 0
152 subs r1, r1, #1 << 5
153 bcs 1b @ segments 15 to 0
154 #endif
155 tst r2, #VM_EXEC
156 #ifndef CONFIG_CPU_ICACHE_DISABLE
157 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
158 #endif
159 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
160 ret lr
161 SYM_FUNC_END(arm1020_flush_kern_cache_all)
162
163 /*
164 * flush_user_cache_range(start, end, flags)
165 *
166 * Invalidate a range of cache entries in the specified
167 * address space.
168 *
169 * - start - start address (inclusive)
170 * - end - end address (exclusive)
171 * - flags - vm_flags for this space
172 */
173 SYM_TYPED_FUNC_START(arm1020_flush_user_cache_range)
174 mov ip, #0
175 sub r3, r1, r0 @ calculate total size
176 cmp r3, #CACHE_DLIMIT
177 bhs __flush_whole_cache
178
179 #ifndef CONFIG_CPU_DCACHE_DISABLE
180 mcr p15, 0, ip, c7, c10, 4
181 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
182 mcr p15, 0, ip, c7, c10, 4 @ drain WB
183 add r0, r0, #CACHE_DLINESIZE
184 cmp r0, r1
185 blo 1b
186 #endif
187 tst r2, #VM_EXEC
188 #ifndef CONFIG_CPU_ICACHE_DISABLE
189 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
190 #endif
191 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
192 ret lr
193 SYM_FUNC_END(arm1020_flush_user_cache_range)
194
195 /*
196 * coherent_kern_range(start, end)
197 *
198 * Ensure coherency between the Icache and the Dcache in the
199 * region described by start. If you have non-snooping
200 * Harvard caches, you need to implement this function.
201 *
202 * - start - virtual start address
203 * - end - virtual end address
204 */
205 SYM_TYPED_FUNC_START(arm1020_coherent_kern_range)
206 #ifdef CONFIG_CFI_CLANG /* Fallthrough if !CFI */
207 b arm1020_coherent_user_range
208 #endif
209 SYM_FUNC_END(arm1020_coherent_kern_range)
210
211 /*
212 * coherent_user_range(start, end)
213 *
214 * Ensure coherency between the Icache and the Dcache in the
215 * region described by start. If you have non-snooping
216 * Harvard caches, you need to implement this function.
217 *
218 * - start - virtual start address
219 * - end - virtual end address
220 */
221 SYM_TYPED_FUNC_START(arm1020_coherent_user_range)
222 mov ip, #0
223 bic r0, r0, #CACHE_DLINESIZE - 1
224 mcr p15, 0, ip, c7, c10, 4
225 1:
226 #ifndef CONFIG_CPU_DCACHE_DISABLE
227 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
228 mcr p15, 0, ip, c7, c10, 4 @ drain WB
229 #endif
230 #ifndef CONFIG_CPU_ICACHE_DISABLE
231 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
232 #endif
233 add r0, r0, #CACHE_DLINESIZE
234 cmp r0, r1
235 blo 1b
236 mcr p15, 0, ip, c7, c10, 4 @ drain WB
237 mov r0, #0
238 ret lr
239 SYM_FUNC_END(arm1020_coherent_user_range)
240
241 /*
242 * flush_kern_dcache_area(void *addr, size_t size)
243 *
244 * Ensure no D cache aliasing occurs, either with itself or
245 * the I cache
246 *
247 * - addr - kernel address
248 * - size - region size
249 */
250 SYM_TYPED_FUNC_START(arm1020_flush_kern_dcache_area)
251 mov ip, #0
252 #ifndef CONFIG_CPU_DCACHE_DISABLE
253 add r1, r0, r1
254 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
255 mcr p15, 0, ip, c7, c10, 4 @ drain WB
256 add r0, r0, #CACHE_DLINESIZE
257 cmp r0, r1
258 blo 1b
259 #endif
260 mcr p15, 0, ip, c7, c10, 4 @ drain WB
261 ret lr
262 SYM_FUNC_END(arm1020_flush_kern_dcache_area)
263
264 /*
265 * dma_inv_range(start, end)
266 *
267 * Invalidate (discard) the specified virtual address range.
268 * May not write back any entries. If 'start' or 'end'
269 * are not cache line aligned, those lines must be written
270 * back.
271 *
272 * - start - virtual start address
273 * - end - virtual end address
274 *
275 * (same as v4wb)
276 */
277 arm1020_dma_inv_range:
278 mov ip, #0
279 #ifndef CONFIG_CPU_DCACHE_DISABLE
280 tst r0, #CACHE_DLINESIZE - 1
281 bic r0, r0, #CACHE_DLINESIZE - 1
282 mcrne p15, 0, ip, c7, c10, 4
283 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
284 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
285 tst r1, #CACHE_DLINESIZE - 1
286 mcrne p15, 0, ip, c7, c10, 4
287 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
288 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
289 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
290 add r0, r0, #CACHE_DLINESIZE
291 cmp r0, r1
292 blo 1b
293 #endif
294 mcr p15, 0, ip, c7, c10, 4 @ drain WB
295 ret lr
296
297 /*
298 * dma_clean_range(start, end)
299 *
300 * Clean the specified virtual address range.
301 *
302 * - start - virtual start address
303 * - end - virtual end address
304 *
305 * (same as v4wb)
306 */
307 arm1020_dma_clean_range:
308 mov ip, #0
309 #ifndef CONFIG_CPU_DCACHE_DISABLE
310 bic r0, r0, #CACHE_DLINESIZE - 1
311 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
312 mcr p15, 0, ip, c7, c10, 4 @ drain WB
313 add r0, r0, #CACHE_DLINESIZE
314 cmp r0, r1
315 blo 1b
316 #endif
317 mcr p15, 0, ip, c7, c10, 4 @ drain WB
318 ret lr
319
320 /*
321 * dma_flush_range(start, end)
322 *
323 * Clean and invalidate the specified virtual address range.
324 *
325 * - start - virtual start address
326 * - end - virtual end address
327 */
328 SYM_TYPED_FUNC_START(arm1020_dma_flush_range)
329 mov ip, #0
330 #ifndef CONFIG_CPU_DCACHE_DISABLE
331 bic r0, r0, #CACHE_DLINESIZE - 1
332 mcr p15, 0, ip, c7, c10, 4
333 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
334 mcr p15, 0, ip, c7, c10, 4 @ drain WB
335 add r0, r0, #CACHE_DLINESIZE
336 cmp r0, r1
337 blo 1b
338 #endif
339 mcr p15, 0, ip, c7, c10, 4 @ drain WB
340 ret lr
341 SYM_FUNC_END(arm1020_dma_flush_range)
342
343 /*
344 * dma_map_area(start, size, dir)
345 * - start - kernel virtual start address
346 * - size - size of region
347 * - dir - DMA direction
348 */
349 SYM_TYPED_FUNC_START(arm1020_dma_map_area)
350 add r1, r1, r0
351 cmp r2, #DMA_TO_DEVICE
352 beq arm1020_dma_clean_range
353 bcs arm1020_dma_inv_range
354 b arm1020_dma_flush_range
355 SYM_FUNC_END(arm1020_dma_map_area)
356
357 /*
358 * dma_unmap_area(start, size, dir)
359 * - start - kernel virtual start address
360 * - size - size of region
361 * - dir - DMA direction
362 */
363 SYM_TYPED_FUNC_START(arm1020_dma_unmap_area)
364 ret lr
365 SYM_FUNC_END(arm1020_dma_unmap_area)
366
367 .align 5
368 SYM_TYPED_FUNC_START(cpu_arm1020_dcache_clean_area)
369 #ifndef CONFIG_CPU_DCACHE_DISABLE
370 mov ip, #0
371 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
372 mcr p15, 0, ip, c7, c10, 4 @ drain WB
373 add r0, r0, #CACHE_DLINESIZE
374 subs r1, r1, #CACHE_DLINESIZE
375 bhi 1b
376 #endif
377 ret lr
378 SYM_FUNC_END(cpu_arm1020_dcache_clean_area)
379
380 /* =============================== PageTable ============================== */
381
382 /*
383 * cpu_arm1020_switch_mm(pgd)
384 *
385 * Set the translation base pointer to be as described by pgd.
386 *
387 * pgd: new page tables
388 */
389 .align 5
390 SYM_TYPED_FUNC_START(cpu_arm1020_switch_mm)
391 #ifdef CONFIG_MMU
392 #ifndef CONFIG_CPU_DCACHE_DISABLE
393 mcr p15, 0, r3, c7, c10, 4
394 mov r1, #0xF @ 16 segments
395 1: mov r3, #0x3F @ 64 entries
396 2: mov ip, r3, LSL #26 @ shift up entry
397 orr ip, ip, r1, LSL #5 @ shift in/up index
398 mcr p15, 0, ip, c7, c14, 2 @ Clean & Inval DCache entry
399 mov ip, #0
400 mcr p15, 0, ip, c7, c10, 4
401 subs r3, r3, #1
402 cmp r3, #0
403 bge 2b @ entries 3F to 0
404 subs r1, r1, #1
405 cmp r1, #0
406 bge 1b @ segments 15 to 0
407
408 #endif
409 mov r1, #0
410 #ifndef CONFIG_CPU_ICACHE_DISABLE
411 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
412 #endif
413 mcr p15, 0, r1, c7, c10, 4 @ drain WB
414 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
415 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
416 #endif /* CONFIG_MMU */
417 ret lr
418 SYM_FUNC_END(cpu_arm1020_switch_mm)
419
420 /*
421 * cpu_arm1020_set_pte(ptep, pte)
422 *
423 * Set a PTE and flush it out
424 */
425 .align 5
426 SYM_TYPED_FUNC_START(cpu_arm1020_set_pte_ext)
427 #ifdef CONFIG_MMU
428 armv3_set_pte_ext
429 mov r0, r0
430 #ifndef CONFIG_CPU_DCACHE_DISABLE
431 mcr p15, 0, r0, c7, c10, 4
432 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
433 #endif
434 mcr p15, 0, r0, c7, c10, 4 @ drain WB
435 #endif /* CONFIG_MMU */
436 ret lr
437 SYM_FUNC_END(cpu_arm1020_set_pte_ext)
438
439 .type __arm1020_setup, #function
440 __arm1020_setup:
441 mov r0, #0
442 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
443 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
444 #ifdef CONFIG_MMU
445 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
446 #endif
447
448 adr r5, arm1020_crval
449 ldmia r5, {r5, r6}
450 mrc p15, 0, r0, c1, c0 @ get control register v4
451 bic r0, r0, r5
452 orr r0, r0, r6
453 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
454 orr r0, r0, #0x4000 @ .R.. .... .... ....
455 #endif
456 ret lr
457 .size __arm1020_setup, . - __arm1020_setup
458
459 /*
460 * R
461 * .RVI ZFRS BLDP WCAM
462 * .011 1001 ..11 0101
463 */
464 .type arm1020_crval, #object
465 arm1020_crval:
466 crval clear=0x0000593f, mmuset=0x00003935, ucset=0x00001930
467
468 __INITDATA
469 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
470 define_processor_functions arm1020, dabort=v4t_early_abort, pabort=legacy_pabort
471
472
473 .section ".rodata"
474
475 string cpu_arch_name, "armv5t"
476 string cpu_elf_name, "v5"
477
478 .type cpu_arm1020_name, #object
479 cpu_arm1020_name:
480 .ascii "ARM1020"
481 #ifndef CONFIG_CPU_ICACHE_DISABLE
482 .ascii "i"
483 #endif
484 #ifndef CONFIG_CPU_DCACHE_DISABLE
485 .ascii "d"
486 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
487 .ascii "(wt)"
488 #else
489 .ascii "(wb)"
490 #endif
491 #endif
492 #ifndef CONFIG_CPU_BPREDICT_DISABLE
493 .ascii "B"
494 #endif
495 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
496 .ascii "RR"
497 #endif
498 .ascii "\0"
499 .size cpu_arm1020_name, . - cpu_arm1020_name
500
501 .align
502
503 .section ".proc.info.init", "a"
504
505 .type __arm1020_proc_info,#object
506 __arm1020_proc_info:
507 .long 0x4104a200 @ ARM 1020T (Architecture v5T)
508 .long 0xff0ffff0
509 .long PMD_TYPE_SECT | \
510 PMD_SECT_AP_WRITE | \
511 PMD_SECT_AP_READ
512 .long PMD_TYPE_SECT | \
513 PMD_SECT_AP_WRITE | \
514 PMD_SECT_AP_READ
515 initfn __arm1020_setup, __arm1020_proc_info
516 .long cpu_arch_name
517 .long cpu_elf_name
518 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
519 .long cpu_arm1020_name
520 .long arm1020_processor_functions
521 .long v4wbi_tlb_fns
522 .long v4wb_user_fns
523 .long arm1020_cache_fns
524 .size __arm1020_proc_info, . - __arm1020_proc_info
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