| blob | fc294067e9776330badad04d7276a9b4d56b2258 |
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.
6 * hacked for non-paged-MM by Hyok S. Choi, 2003.
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>
18 #include <linux/init.h>
19 #include <asm/assembler.h>
20 #include <asm/asm-offsets.h>
21 #include <asm/hwcap.h>
22 #include <asm/pgtable-hwdef.h>
23 #include <asm/pgtable.h>
24 #include <asm/ptrace.h>
26 #include "proc-macros.S"
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
38 /*
39 * The size of one data cache line.
40 */
41 #define CACHE_DLINESIZE 32
43 /*
44 * The number of data cache segments.
45 */
46 #define CACHE_DSEGMENTS 16
48 /*
49 * The number of lines in a cache segment.
50 */
51 #define CACHE_DENTRIES 64
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 maintenance instructions.
57 */
58 #define CACHE_DLIMIT 32768
60 .text
61 /*
62 * cpu_arm1026_proc_init()
63 */
64 ENTRY(cpu_arm1026_proc_init)
65 ret lr
67 /*
68 * cpu_arm1026_proc_fin()
69 */
70 ENTRY(cpu_arm1026_proc_fin)
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
75 ret lr
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 .pushsection .idmap.text, "ax"
88 ENTRY(cpu_arm1026_reset)
89 mov ip, #0
90 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
91 mcr p15, 0, ip, c7, c10, 4 @ drain WB
92 #ifdef CONFIG_MMU
93 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
94 #endif
95 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
96 bic ip, ip, #0x000f @ ............wcam
97 bic ip, ip, #0x1100 @ ...i...s........
98 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
99 ret r0
100 ENDPROC(cpu_arm1026_reset)
101 .popsection
103 /*
104 * cpu_arm1026_do_idle()
105 */
106 .align 5
107 ENTRY(cpu_arm1026_do_idle)
108 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
109 ret lr
111 /* ================================= CACHE ================================ */
113 .align 5
115 /*
116 * flush_icache_all()
117 *
118 * Unconditionally clean and invalidate the entire icache.
119 */
120 ENTRY(arm1026_flush_icache_all)
121 #ifndef CONFIG_CPU_ICACHE_DISABLE
122 mov r0, #0
123 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
124 #endif
125 ret lr
126 ENDPROC(arm1026_flush_icache_all)
128 /*
129 * flush_user_cache_all()
130 *
131 * Invalidate all cache entries in a particular address
132 * space.
133 */
134 ENTRY(arm1026_flush_user_cache_all)
135 /* FALLTHROUGH */
136 /*
137 * flush_kern_cache_all()
138 *
139 * Clean and invalidate the entire cache.
140 */
141 ENTRY(arm1026_flush_kern_cache_all)
142 mov r2, #VM_EXEC
143 mov ip, #0
144 __flush_whole_cache:
145 #ifndef CONFIG_CPU_DCACHE_DISABLE
146 1: mrc p15, 0, r15, c7, c14, 3 @ test, clean, invalidate
147 bne 1b
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(arm1026_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(arm1026_coherent_kern_range)
196 /* FALLTHROUGH */
197 /*
198 * coherent_user_range(start, end)
199 *
200 * Ensure coherency between the Icache and the Dcache in the
201 * region described by start. If you have non-snooping
202 * Harvard caches, you need to implement this function.
203 *
204 * - start - virtual start address
205 * - end - virtual end address
206 */
207 ENTRY(arm1026_coherent_user_range)
208 mov ip, #0
209 bic r0, r0, #CACHE_DLINESIZE - 1
210 1:
211 #ifndef CONFIG_CPU_DCACHE_DISABLE
212 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
213 #endif
214 #ifndef CONFIG_CPU_ICACHE_DISABLE
215 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
216 #endif
217 add r0, r0, #CACHE_DLINESIZE
218 cmp r0, r1
219 blo 1b
220 mcr p15, 0, ip, c7, c10, 4 @ drain WB
221 mov r0, #0
222 ret lr
224 /*
225 * flush_kern_dcache_area(void *addr, size_t size)
226 *
227 * Ensure no D cache aliasing occurs, either with itself or
228 * the I cache
229 *
230 * - addr - kernel address
231 * - size - region size
232 */
233 ENTRY(arm1026_flush_kern_dcache_area)
234 mov ip, #0
235 #ifndef CONFIG_CPU_DCACHE_DISABLE
236 add r1, r0, r1
237 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
238 add r0, r0, #CACHE_DLINESIZE
239 cmp r0, r1
240 blo 1b
241 #endif
242 mcr p15, 0, ip, c7, c10, 4 @ drain WB
243 ret lr
245 /*
246 * dma_inv_range(start, end)
247 *
248 * Invalidate (discard) the specified virtual address range.
249 * May not write back any entries. If 'start' or 'end'
250 * are not cache line aligned, those lines must be written
251 * back.
252 *
253 * - start - virtual start address
254 * - end - virtual end address
255 *
256 * (same as v4wb)
257 */
258 arm1026_dma_inv_range:
259 mov ip, #0
260 #ifndef CONFIG_CPU_DCACHE_DISABLE
261 tst r0, #CACHE_DLINESIZE - 1
262 bic r0, r0, #CACHE_DLINESIZE - 1
263 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
264 tst r1, #CACHE_DLINESIZE - 1
265 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
266 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
267 add r0, r0, #CACHE_DLINESIZE
268 cmp r0, r1
269 blo 1b
270 #endif
271 mcr p15, 0, ip, c7, c10, 4 @ drain WB
272 ret lr
274 /*
275 * dma_clean_range(start, end)
276 *
277 * Clean the specified virtual address range.
278 *
279 * - start - virtual start address
280 * - end - virtual end address
281 *
282 * (same as v4wb)
283 */
284 arm1026_dma_clean_range:
285 mov ip, #0
286 #ifndef CONFIG_CPU_DCACHE_DISABLE
287 bic r0, r0, #CACHE_DLINESIZE - 1
288 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
289 add r0, r0, #CACHE_DLINESIZE
290 cmp r0, r1
291 blo 1b
292 #endif
293 mcr p15, 0, ip, c7, c10, 4 @ drain WB
294 ret lr
296 /*
297 * dma_flush_range(start, end)
298 *
299 * Clean and invalidate the specified virtual address range.
300 *
301 * - start - virtual start address
302 * - end - virtual end address
303 */
304 ENTRY(arm1026_dma_flush_range)
305 mov ip, #0
306 #ifndef CONFIG_CPU_DCACHE_DISABLE
307 bic r0, r0, #CACHE_DLINESIZE - 1
308 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
309 add r0, r0, #CACHE_DLINESIZE
310 cmp r0, r1
311 blo 1b
312 #endif
313 mcr p15, 0, ip, c7, c10, 4 @ drain WB
314 ret lr
316 /*
317 * dma_map_area(start, size, dir)
318 * - start - kernel virtual start address
319 * - size - size of region
320 * - dir - DMA direction
321 */
322 ENTRY(arm1026_dma_map_area)
323 add r1, r1, r0
324 cmp r2, #DMA_TO_DEVICE
325 beq arm1026_dma_clean_range
326 bcs arm1026_dma_inv_range
327 b arm1026_dma_flush_range
328 ENDPROC(arm1026_dma_map_area)
330 /*
331 * dma_unmap_area(start, size, dir)
332 * - start - kernel virtual start address
333 * - size - size of region
334 * - dir - DMA direction
335 */
336 ENTRY(arm1026_dma_unmap_area)
337 ret lr
338 ENDPROC(arm1026_dma_unmap_area)
340 .globl arm1026_flush_kern_cache_louis
341 .equ arm1026_flush_kern_cache_louis, arm1026_flush_kern_cache_all
343 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
344 define_cache_functions arm1026
346 .align 5
347 ENTRY(cpu_arm1026_dcache_clean_area)
348 #ifndef CONFIG_CPU_DCACHE_DISABLE
349 mov ip, #0
350 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
351 add r0, r0, #CACHE_DLINESIZE
352 subs r1, r1, #CACHE_DLINESIZE
353 bhi 1b
354 #endif
355 ret lr
357 /* =============================== PageTable ============================== */
359 /*
360 * cpu_arm1026_switch_mm(pgd)
361 *
362 * Set the translation base pointer to be as described by pgd.
363 *
364 * pgd: new page tables
365 */
366 .align 5
367 ENTRY(cpu_arm1026_switch_mm)
368 #ifdef CONFIG_MMU
369 mov r1, #0
370 #ifndef CONFIG_CPU_DCACHE_DISABLE
371 1: mrc p15, 0, r15, c7, c14, 3 @ test, clean, invalidate
372 bne 1b
373 #endif
374 #ifndef CONFIG_CPU_ICACHE_DISABLE
375 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
376 #endif
377 mcr p15, 0, r1, c7, c10, 4 @ drain WB
378 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
379 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
380 #endif
381 ret lr
383 /*
384 * cpu_arm1026_set_pte_ext(ptep, pte, ext)
385 *
386 * Set a PTE and flush it out
387 */
388 .align 5
389 ENTRY(cpu_arm1026_set_pte_ext)
390 #ifdef CONFIG_MMU
391 armv3_set_pte_ext
392 mov r0, r0
393 #ifndef CONFIG_CPU_DCACHE_DISABLE
394 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
395 #endif
396 #endif /* CONFIG_MMU */
397 ret lr
399 .type __arm1026_setup, #function
400 __arm1026_setup:
401 mov r0, #0
402 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
403 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
404 #ifdef CONFIG_MMU
405 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
406 mcr p15, 0, r4, c2, c0 @ load page table pointer
407 #endif
408 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
409 mov r0, #4 @ explicitly disable writeback
410 mcr p15, 7, r0, c15, c0, 0
411 #endif
412 adr r5, arm1026_crval
413 ldmia r5, {r5, r6}
414 mrc p15, 0, r0, c1, c0 @ get control register v4
415 bic r0, r0, r5
416 orr r0, r0, r6
417 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
418 orr r0, r0, #0x4000 @ .R.. .... .... ....
419 #endif
420 ret lr
421 .size __arm1026_setup, . - __arm1026_setup
423 /*
424 * R
425 * .RVI ZFRS BLDP WCAM
426 * .011 1001 ..11 0101
427 *
428 */
429 .type arm1026_crval, #object
430 arm1026_crval:
431 crval clear=0x00007f3f, mmuset=0x00003935, ucset=0x00001934
433 __INITDATA
434 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
435 define_processor_functions arm1026, dabort=v5t_early_abort, pabort=legacy_pabort
437 .section .rodata
439 string cpu_arch_name, "armv5tej"
440 string cpu_elf_name, "v5"
441 .align
442 string cpu_arm1026_name, "ARM1026EJ-S"
443 .align
445 .section ".proc.info.init", #alloc, #execinstr
447 .type __arm1026_proc_info,#object
448 __arm1026_proc_info:
449 .long 0x4106a260 @ ARM 1026EJ-S (v5TEJ)
450 .long 0xff0ffff0
451 .long PMD_TYPE_SECT | \
452 PMD_BIT4 | \
453 PMD_SECT_AP_WRITE | \
454 PMD_SECT_AP_READ
455 .long PMD_TYPE_SECT | \
456 PMD_BIT4 | \
457 PMD_SECT_AP_WRITE | \
458 PMD_SECT_AP_READ
459 b __arm1026_setup
460 .long cpu_arch_name
461 .long cpu_elf_name
462 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_JAVA
463 .long cpu_arm1026_name
464 .long arm1026_processor_functions
465 .long v4wbi_tlb_fns
466 .long v4wb_user_fns
467 .long arm1026_cache_fns
468 .size __arm1026_proc_info, . - __arm1026_proc_info