1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * linux/arch/arm/mm/proc-arm1020e.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 arm1020e.
11 */
12#include <linux/linkage.h>
13#include <linux/init.h>
14#include <linux/pgtable.h>
15#include <asm/assembler.h>
16#include <asm/asm-offsets.h>
17#include <asm/hwcap.h>
18#include <asm/pgtable-hwdef.h>
19#include <asm/ptrace.h>
20
21#include "proc-macros.S"
22
23/*
24 * This is the maximum size of an area which will be invalidated
25 * using the single invalidate entry instructions. Anything larger
26 * than this, and we go for the whole cache.
27 *
28 * This value should be chosen such that we choose the cheapest
29 * alternative.
30 */
31#define MAX_AREA_SIZE 32768
32
33/*
34 * The size of one data cache line.
35 */
36#define CACHE_DLINESIZE 32
37
38/*
39 * The number of data cache segments.
40 */
41#define CACHE_DSEGMENTS 16
42
43/*
44 * The number of lines in a cache segment.
45 */
46#define CACHE_DENTRIES 64
47
48/*
49 * This is the size at which it becomes more efficient to
50 * clean the whole cache, rather than using the individual
51 * cache line maintenance instructions.
52 */
53#define CACHE_DLIMIT 32768
54
55 .text
56/*
57 * cpu_arm1020e_proc_init()
58 */
59ENTRY(cpu_arm1020e_proc_init)
60 ret lr
61
62/*
63 * cpu_arm1020e_proc_fin()
64 */
65ENTRY(cpu_arm1020e_proc_fin)
66 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
67 bic r0, r0, #0x1000 @ ...i............
68 bic r0, r0, #0x000e @ ............wca.
69 mcr p15, 0, r0, c1, c0, 0 @ disable caches
70 ret lr
71
72/*
73 * cpu_arm1020e_reset(loc)
74 *
75 * Perform a soft reset of the system. Put the CPU into the
76 * same state as it would be if it had been reset, and branch
77 * to what would be the reset vector.
78 *
79 * loc: location to jump to for soft reset
80 */
81 .align 5
82 .pushsection .idmap.text, "ax"
83ENTRY(cpu_arm1020e_reset)
84 mov ip, #0
85 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
86 mcr p15, 0, ip, c7, c10, 4 @ drain WB
87#ifdef CONFIG_MMU
88 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
89#endif
90 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
91 bic ip, ip, #0x000f @ ............wcam
92 bic ip, ip, #0x1100 @ ...i...s........
93 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
94 ret r0
95ENDPROC(cpu_arm1020e_reset)
96 .popsection
97
98/*
99 * cpu_arm1020e_do_idle()
100 */
101 .align 5
102ENTRY(cpu_arm1020e_do_idle)
103 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
104 ret lr
105
106/* ================================= CACHE ================================ */
107
108 .align 5
109
110/*
111 * flush_icache_all()
112 *
113 * Unconditionally clean and invalidate the entire icache.
114 */
115ENTRY(arm1020e_flush_icache_all)
116#ifndef CONFIG_CPU_ICACHE_DISABLE
117 mov r0, #0
118 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
119#endif
120 ret lr
121ENDPROC(arm1020e_flush_icache_all)
122
123/*
124 * flush_user_cache_all()
125 *
126 * Invalidate all cache entries in a particular address
127 * space.
128 */
129ENTRY(arm1020e_flush_user_cache_all)
130 /* FALLTHROUGH */
131/*
132 * flush_kern_cache_all()
133 *
134 * Clean and invalidate the entire cache.
135 */
136ENTRY(arm1020e_flush_kern_cache_all)
137 mov r2, #VM_EXEC
138 mov ip, #0
139__flush_whole_cache:
140#ifndef CONFIG_CPU_DCACHE_DISABLE
141 mcr p15, 0, ip, c7, c10, 4 @ drain WB
142 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments
1431: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
1442: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
145 subs r3, r3, #1 << 26
146 bcs 2b @ entries 63 to 0
147 subs r1, r1, #1 << 5
148 bcs 1b @ segments 15 to 0
149#endif
150 tst r2, #VM_EXEC
151#ifndef CONFIG_CPU_ICACHE_DISABLE
152 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
153#endif
154 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
155 ret lr
156
157/*
158 * flush_user_cache_range(start, end, flags)
159 *
160 * Invalidate a range of cache entries in the specified
161 * address space.
162 *
163 * - start - start address (inclusive)
164 * - end - end address (exclusive)
165 * - flags - vm_flags for this space
166 */
167ENTRY(arm1020e_flush_user_cache_range)
168 mov ip, #0
169 sub r3, r1, r0 @ calculate total size
170 cmp r3, #CACHE_DLIMIT
171 bhs __flush_whole_cache
172
173#ifndef CONFIG_CPU_DCACHE_DISABLE
1741: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
175 add r0, r0, #CACHE_DLINESIZE
176 cmp r0, r1
177 blo 1b
178#endif
179 tst r2, #VM_EXEC
180#ifndef CONFIG_CPU_ICACHE_DISABLE
181 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
182#endif
183 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
184 ret lr
185
186/*
187 * coherent_kern_range(start, end)
188 *
189 * Ensure coherency between the Icache and the Dcache in the
190 * region described by start. If you have non-snooping
191 * Harvard caches, you need to implement this function.
192 *
193 * - start - virtual start address
194 * - end - virtual end address
195 */
196ENTRY(arm1020e_coherent_kern_range)
197 /* FALLTHROUGH */
198/*
199 * coherent_user_range(start, end)
200 *
201 * Ensure coherency between the Icache and the Dcache in the
202 * region described by start. If you have non-snooping
203 * Harvard caches, you need to implement this function.
204 *
205 * - start - virtual start address
206 * - end - virtual end address
207 */
208ENTRY(arm1020e_coherent_user_range)
209 mov ip, #0
210 bic r0, r0, #CACHE_DLINESIZE - 1
2111:
212#ifndef CONFIG_CPU_DCACHE_DISABLE
213 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
214#endif
215#ifndef CONFIG_CPU_ICACHE_DISABLE
216 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
217#endif
218 add r0, r0, #CACHE_DLINESIZE
219 cmp r0, r1
220 blo 1b
221 mcr p15, 0, ip, c7, c10, 4 @ drain WB
222 mov r0, #0
223 ret lr
224
225/*
226 * flush_kern_dcache_area(void *addr, size_t size)
227 *
228 * Ensure no D cache aliasing occurs, either with itself or
229 * the I cache
230 *
231 * - addr - kernel address
232 * - size - region size
233 */
234ENTRY(arm1020e_flush_kern_dcache_area)
235 mov ip, #0
236#ifndef CONFIG_CPU_DCACHE_DISABLE
237 add r1, r0, r1
2381: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
239 add r0, r0, #CACHE_DLINESIZE
240 cmp r0, r1
241 blo 1b
242#endif
243 mcr p15, 0, ip, c7, c10, 4 @ drain WB
244 ret lr
245
246/*
247 * dma_inv_range(start, end)
248 *
249 * Invalidate (discard) the specified virtual address range.
250 * May not write back any entries. If 'start' or 'end'
251 * are not cache line aligned, those lines must be written
252 * back.
253 *
254 * - start - virtual start address
255 * - end - virtual end address
256 *
257 * (same as v4wb)
258 */
259arm1020e_dma_inv_range:
260 mov ip, #0
261#ifndef CONFIG_CPU_DCACHE_DISABLE
262 tst r0, #CACHE_DLINESIZE - 1
263 bic r0, r0, #CACHE_DLINESIZE - 1
264 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
265 tst r1, #CACHE_DLINESIZE - 1
266 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
2671: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
268 add r0, r0, #CACHE_DLINESIZE
269 cmp r0, r1
270 blo 1b
271#endif
272 mcr p15, 0, ip, c7, c10, 4 @ drain WB
273 ret lr
274
275/*
276 * dma_clean_range(start, end)
277 *
278 * Clean the specified virtual address range.
279 *
280 * - start - virtual start address
281 * - end - virtual end address
282 *
283 * (same as v4wb)
284 */
285arm1020e_dma_clean_range:
286 mov ip, #0
287#ifndef CONFIG_CPU_DCACHE_DISABLE
288 bic r0, r0, #CACHE_DLINESIZE - 1
2891: mcr p15, 0, r0, c7, c10, 1 @ clean 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_flush_range(start, end)
299 *
300 * Clean and invalidate the specified virtual address range.
301 *
302 * - start - virtual start address
303 * - end - virtual end address
304 */
305ENTRY(arm1020e_dma_flush_range)
306 mov ip, #0
307#ifndef CONFIG_CPU_DCACHE_DISABLE
308 bic r0, r0, #CACHE_DLINESIZE - 1
3091: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
310 add r0, r0, #CACHE_DLINESIZE
311 cmp r0, r1
312 blo 1b
313#endif
314 mcr p15, 0, ip, c7, c10, 4 @ drain WB
315 ret lr
316
317/*
318 * dma_map_area(start, size, dir)
319 * - start - kernel virtual start address
320 * - size - size of region
321 * - dir - DMA direction
322 */
323ENTRY(arm1020e_dma_map_area)
324 add r1, r1, r0
325 cmp r2, #DMA_TO_DEVICE
326 beq arm1020e_dma_clean_range
327 bcs arm1020e_dma_inv_range
328 b arm1020e_dma_flush_range
329ENDPROC(arm1020e_dma_map_area)
330
331/*
332 * dma_unmap_area(start, size, dir)
333 * - start - kernel virtual start address
334 * - size - size of region
335 * - dir - DMA direction
336 */
337ENTRY(arm1020e_dma_unmap_area)
338 ret lr
339ENDPROC(arm1020e_dma_unmap_area)
340
341 .globl arm1020e_flush_kern_cache_louis
342 .equ arm1020e_flush_kern_cache_louis, arm1020e_flush_kern_cache_all
343
344 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
345 define_cache_functions arm1020e
346
347 .align 5
348ENTRY(cpu_arm1020e_dcache_clean_area)
349#ifndef CONFIG_CPU_DCACHE_DISABLE
350 mov ip, #0
3511: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
352 add r0, r0, #CACHE_DLINESIZE
353 subs r1, r1, #CACHE_DLINESIZE
354 bhi 1b
355#endif
356 ret lr
357
358/* =============================== PageTable ============================== */
359
360/*
361 * cpu_arm1020e_switch_mm(pgd)
362 *
363 * Set the translation base pointer to be as described by pgd.
364 *
365 * pgd: new page tables
366 */
367 .align 5
368ENTRY(cpu_arm1020e_switch_mm)
369#ifdef CONFIG_MMU
370#ifndef CONFIG_CPU_DCACHE_DISABLE
371 mcr p15, 0, r3, c7, c10, 4
372 mov r1, #0xF @ 16 segments
3731: mov r3, #0x3F @ 64 entries
3742: mov ip, r3, LSL #26 @ shift up entry
375 orr ip, ip, r1, LSL #5 @ shift in/up index
376 mcr p15, 0, ip, c7, c14, 2 @ Clean & Inval DCache entry
377 mov ip, #0
378 subs r3, r3, #1
379 cmp r3, #0
380 bge 2b @ entries 3F to 0
381 subs r1, r1, #1
382 cmp r1, #0
383 bge 1b @ segments 15 to 0
384
385#endif
386 mov r1, #0
387#ifndef CONFIG_CPU_ICACHE_DISABLE
388 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
389#endif
390 mcr p15, 0, r1, c7, c10, 4 @ drain WB
391 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
392 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
393#endif
394 ret lr
395
396/*
397 * cpu_arm1020e_set_pte(ptep, pte)
398 *
399 * Set a PTE and flush it out
400 */
401 .align 5
402ENTRY(cpu_arm1020e_set_pte_ext)
403#ifdef CONFIG_MMU
404 armv3_set_pte_ext
405 mov r0, r0
406#ifndef CONFIG_CPU_DCACHE_DISABLE
407 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
408#endif
409#endif /* CONFIG_MMU */
410 ret lr
411
412 .type __arm1020e_setup, #function
413__arm1020e_setup:
414 mov r0, #0
415 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
416 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
417#ifdef CONFIG_MMU
418 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
419#endif
420 adr r5, arm1020e_crval
421 ldmia r5, {r5, r6}
422 mrc p15, 0, r0, c1, c0 @ get control register v4
423 bic r0, r0, r5
424 orr r0, r0, r6
425#ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
426 orr r0, r0, #0x4000 @ .R.. .... .... ....
427#endif
428 ret lr
429 .size __arm1020e_setup, . - __arm1020e_setup
430
431 /*
432 * R
433 * .RVI ZFRS BLDP WCAM
434 * .011 1001 ..11 0101
435 */
436 .type arm1020e_crval, #object
437arm1020e_crval:
438 crval clear=0x00007f3f, mmuset=0x00003935, ucset=0x00001930
439
440 __INITDATA
441 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
442 define_processor_functions arm1020e, dabort=v4t_early_abort, pabort=legacy_pabort
443
444 .section ".rodata"
445
446 string cpu_arch_name, "armv5te"
447 string cpu_elf_name, "v5"
448 string cpu_arm1020e_name, "ARM1020E"
449
450 .align
451
452 .section ".proc.info.init", "a"
453
454 .type __arm1020e_proc_info,#object
455__arm1020e_proc_info:
456 .long 0x4105a200 @ ARM 1020TE (Architecture v5TE)
457 .long 0xff0ffff0
458 .long PMD_TYPE_SECT | \
459 PMD_BIT4 | \
460 PMD_SECT_AP_WRITE | \
461 PMD_SECT_AP_READ
462 .long PMD_TYPE_SECT | \
463 PMD_BIT4 | \
464 PMD_SECT_AP_WRITE | \
465 PMD_SECT_AP_READ
466 initfn __arm1020e_setup, __arm1020e_proc_info
467 .long cpu_arch_name
468 .long cpu_elf_name
469 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_EDSP
470 .long cpu_arm1020e_name
471 .long arm1020e_processor_functions
472 .long v4wbi_tlb_fns
473 .long v4wb_user_fns
474 .long arm1020e_cache_fns
475 .size __arm1020e_proc_info, . - __arm1020e_proc_info
476

source code of linux/arch/arm/mm/proc-arm1020e.S