| blob | e89ce467f6728774754bdd4b26dc33629299fe7f |
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * linux/arch/arm/mm/proc-arm1022.S: MMU functions for ARM1022E
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 ARM1022E.
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>
21 #include "proc-macros.S"
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
33 /*
34 * The size of one data cache line.
35 */
36 #define CACHE_DLINESIZE 32
38 /*
39 * The number of data cache segments.
40 */
41 #define CACHE_DSEGMENTS 16
43 /*
44 * The number of lines in a cache segment.
45 */
46 #define CACHE_DENTRIES 64
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
55 .text
56 /*
57 * cpu_arm1022_proc_init()
58 */
59 ENTRY(cpu_arm1022_proc_init)
60 ret lr
62 /*
63 * cpu_arm1022_proc_fin()
64 */
65 ENTRY(cpu_arm1022_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
72 /*
73 * cpu_arm1022_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"
83 ENTRY(cpu_arm1022_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
95 ENDPROC(cpu_arm1022_reset)
96 .popsection
98 /*
99 * cpu_arm1022_do_idle()
100 */
101 .align 5
102 ENTRY(cpu_arm1022_do_idle)
103 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
104 ret lr
106 /* ================================= CACHE ================================ */
108 .align 5
110 /*
111 * flush_icache_all()
112 *
113 * Unconditionally clean and invalidate the entire icache.
114 */
115 ENTRY(arm1022_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
121 ENDPROC(arm1022_flush_icache_all)
123 /*
124 * flush_user_cache_all()
125 *
126 * Invalidate all cache entries in a particular address
127 * space.
128 */
129 ENTRY(arm1022_flush_user_cache_all)
130 /* FALLTHROUGH */
131 /*
132 * flush_kern_cache_all()
133 *
134 * Clean and invalidate the entire cache.
135 */
136 ENTRY(arm1022_flush_kern_cache_all)
137 mov r2, #VM_EXEC
138 mov ip, #0
139 __flush_whole_cache:
140 #ifndef CONFIG_CPU_DCACHE_DISABLE
141 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments
142 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
143 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
144 subs r3, r3, #1 << 26
145 bcs 2b @ entries 63 to 0
146 subs r1, r1, #1 << 5
147 bcs 1b @ segments 15 to 0
148 #endif
149 tst r2, #VM_EXEC
150 #ifndef CONFIG_CPU_ICACHE_DISABLE
151 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
152 #endif
153 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
154 ret lr
156 /*
157 * flush_user_cache_range(start, end, flags)
158 *
159 * Invalidate a range of cache entries in the specified
160 * address space.
161 *
162 * - start - start address (inclusive)
163 * - end - end address (exclusive)
164 * - flags - vm_flags for this space
165 */
166 ENTRY(arm1022_flush_user_cache_range)
167 mov ip, #0
168 sub r3, r1, r0 @ calculate total size
169 cmp r3, #CACHE_DLIMIT
170 bhs __flush_whole_cache
172 #ifndef CONFIG_CPU_DCACHE_DISABLE
173 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
174 add r0, r0, #CACHE_DLINESIZE
175 cmp r0, r1
176 blo 1b
177 #endif
178 tst r2, #VM_EXEC
179 #ifndef CONFIG_CPU_ICACHE_DISABLE
180 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
181 #endif
182 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
183 ret lr
185 /*
186 * coherent_kern_range(start, end)
187 *
188 * Ensure coherency between the Icache and the Dcache in the
189 * region described by start. If you have non-snooping
190 * Harvard caches, you need to implement this function.
191 *
192 * - start - virtual start address
193 * - end - virtual end address
194 */
195 ENTRY(arm1022_coherent_kern_range)
196 /* 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 */
208 ENTRY(arm1022_coherent_user_range)
209 mov ip, #0
210 bic r0, r0, #CACHE_DLINESIZE - 1
211 1:
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
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 */
234 ENTRY(arm1022_flush_kern_dcache_area)
235 mov ip, #0
236 #ifndef CONFIG_CPU_DCACHE_DISABLE
237 add r1, r0, r1
238 1: 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
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 */
259 arm1022_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
267 1: 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
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 */
285 arm1022_dma_clean_range:
286 mov ip, #0
287 #ifndef CONFIG_CPU_DCACHE_DISABLE
288 bic r0, r0, #CACHE_DLINESIZE - 1
289 1: 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
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 */
305 ENTRY(arm1022_dma_flush_range)
306 mov ip, #0
307 #ifndef CONFIG_CPU_DCACHE_DISABLE
308 bic r0, r0, #CACHE_DLINESIZE - 1
309 1: 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
317 /*
318 * dma_map_area(start, size, dir)
319 * - start - kernel virtual start address
320 * - size - size of region
321 * - dir - DMA direction
322 */
323 ENTRY(arm1022_dma_map_area)
324 add r1, r1, r0
325 cmp r2, #DMA_TO_DEVICE
326 beq arm1022_dma_clean_range
327 bcs arm1022_dma_inv_range
328 b arm1022_dma_flush_range
329 ENDPROC(arm1022_dma_map_area)
331 /*
332 * dma_unmap_area(start, size, dir)
333 * - start - kernel virtual start address
334 * - size - size of region
335 * - dir - DMA direction
336 */
337 ENTRY(arm1022_dma_unmap_area)
338 ret lr
339 ENDPROC(arm1022_dma_unmap_area)
341 .globl arm1022_flush_kern_cache_louis
342 .equ arm1022_flush_kern_cache_louis, arm1022_flush_kern_cache_all
344 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
345 define_cache_functions arm1022
347 .align 5
348 ENTRY(cpu_arm1022_dcache_clean_area)
349 #ifndef CONFIG_CPU_DCACHE_DISABLE
350 mov ip, #0
351 1: 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
358 /* =============================== PageTable ============================== */
360 /*
361 * cpu_arm1022_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
368 ENTRY(cpu_arm1022_switch_mm)
369 #ifdef CONFIG_MMU
370 #ifndef CONFIG_CPU_DCACHE_DISABLE
371 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments
372 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
373 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
374 subs r3, r3, #1 << 26
375 bcs 2b @ entries 63 to 0
376 subs r1, r1, #1 << 5
377 bcs 1b @ segments 15 to 0
378 #endif
379 mov r1, #0
380 #ifndef CONFIG_CPU_ICACHE_DISABLE
381 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
382 #endif
383 mcr p15, 0, r1, c7, c10, 4 @ drain WB
384 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
385 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
386 #endif
387 ret lr
389 /*
390 * cpu_arm1022_set_pte_ext(ptep, pte, ext)
391 *
392 * Set a PTE and flush it out
393 */
394 .align 5
395 ENTRY(cpu_arm1022_set_pte_ext)
396 #ifdef CONFIG_MMU
397 armv3_set_pte_ext
398 mov r0, r0
399 #ifndef CONFIG_CPU_DCACHE_DISABLE
400 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
401 #endif
402 #endif /* CONFIG_MMU */
403 ret lr
405 .type __arm1022_setup, #function
406 __arm1022_setup:
407 mov r0, #0
408 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
409 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
410 #ifdef CONFIG_MMU
411 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
412 #endif
413 adr r5, arm1022_crval
414 ldmia r5, {r5, r6}
415 mrc p15, 0, r0, c1, c0 @ get control register v4
416 bic r0, r0, r5
417 orr r0, r0, r6
418 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
419 orr r0, r0, #0x4000 @ .R..............
420 #endif
421 ret lr
422 .size __arm1022_setup, . - __arm1022_setup
424 /*
425 * R
426 * .RVI ZFRS BLDP WCAM
427 * .011 1001 ..11 0101
428 *
429 */
430 .type arm1022_crval, #object
431 arm1022_crval:
432 crval clear=0x00007f3f, mmuset=0x00003935, ucset=0x00001930
434 __INITDATA
435 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
436 define_processor_functions arm1022, dabort=v4t_early_abort, pabort=legacy_pabort
438 .section ".rodata"
440 string cpu_arch_name, "armv5te"
441 string cpu_elf_name, "v5"
442 string cpu_arm1022_name, "ARM1022"
444 .align
446 .section ".proc.info.init", "a"
448 .type __arm1022_proc_info,#object
449 __arm1022_proc_info:
450 .long 0x4105a220 @ ARM 1022E (v5TE)
451 .long 0xff0ffff0
452 .long PMD_TYPE_SECT | \
453 PMD_BIT4 | \
454 PMD_SECT_AP_WRITE | \
455 PMD_SECT_AP_READ
456 .long PMD_TYPE_SECT | \
457 PMD_BIT4 | \
458 PMD_SECT_AP_WRITE | \
459 PMD_SECT_AP_READ
460 initfn __arm1022_setup, __arm1022_proc_info
461 .long cpu_arch_name
462 .long cpu_elf_name
463 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_EDSP
464 .long cpu_arm1022_name
465 .long arm1022_processor_functions
466 .long v4wbi_tlb_fns
467 .long v4wb_user_fns
468 .long arm1022_cache_fns
469 .size __arm1022_proc_info, . - __arm1022_proc_info