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1/*
2 * linux/arch/arm/mm/proc-arm1022.S: MMU functions for ARM1022E
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 ARM1022E.
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>
25
26#include "proc-macros.S"
27
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 maintenance instructions.
57 */
58#define CACHE_DLIMIT 32768
59
60 .text
61/*
62 * cpu_arm1022_proc_init()
63 */
64ENTRY(cpu_arm1022_proc_init)
65 mov pc, lr
66
67/*
68 * cpu_arm1022_proc_fin()
69 */
70ENTRY(cpu_arm1022_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 mov pc, lr
76
77/*
78 * cpu_arm1022_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"
88ENTRY(cpu_arm1022_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 mov pc, r0
100ENDPROC(cpu_arm1022_reset)
101 .popsection
102
103/*
104 * cpu_arm1022_do_idle()
105 */
106 .align 5
107ENTRY(cpu_arm1022_do_idle)
108 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
109 mov pc, lr
110
111/* ================================= CACHE ================================ */
112
113 .align 5
114
115/*
116 * flush_icache_all()
117 *
118 * Unconditionally clean and invalidate the entire icache.
119 */
120ENTRY(arm1022_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 mov pc, lr
126ENDPROC(arm1022_flush_icache_all)
127
128/*
129 * flush_user_cache_all()
130 *
131 * Invalidate all cache entries in a particular address
132 * space.
133 */
134ENTRY(arm1022_flush_user_cache_all)
135 /* FALLTHROUGH */
136/*
137 * flush_kern_cache_all()
138 *
139 * Clean and invalidate the entire cache.
140 */
141ENTRY(arm1022_flush_kern_cache_all)
142 mov r2, #VM_EXEC
143 mov ip, #0
144__flush_whole_cache:
145#ifndef CONFIG_CPU_DCACHE_DISABLE
146 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments
1471: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
1482: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
149 subs r3, r3, #1 << 26
150 bcs 2b @ entries 63 to 0
151 subs r1, r1, #1 << 5
152 bcs 1b @ segments 15 to 0
153#endif
154 tst r2, #VM_EXEC
155#ifndef CONFIG_CPU_ICACHE_DISABLE
156 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
157#endif
158 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
159 mov pc, lr
160
161/*
162 * flush_user_cache_range(start, end, flags)
163 *
164 * Invalidate a range of cache entries in the specified
165 * address space.
166 *
167 * - start - start address (inclusive)
168 * - end - end address (exclusive)
169 * - flags - vm_flags for this space
170 */
171ENTRY(arm1022_flush_user_cache_range)
172 mov ip, #0
173 sub r3, r1, r0 @ calculate total size
174 cmp r3, #CACHE_DLIMIT
175 bhs __flush_whole_cache
176
177#ifndef CONFIG_CPU_DCACHE_DISABLE
1781: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
179 add r0, r0, #CACHE_DLINESIZE
180 cmp r0, r1
181 blo 1b
182#endif
183 tst r2, #VM_EXEC
184#ifndef CONFIG_CPU_ICACHE_DISABLE
185 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
186#endif
187 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
188 mov pc, lr
189
190/*
191 * coherent_kern_range(start, end)
192 *
193 * Ensure coherency between the Icache and the Dcache in the
194 * region described by start. If you have non-snooping
195 * Harvard caches, you need to implement this function.
196 *
197 * - start - virtual start address
198 * - end - virtual end address
199 */
200ENTRY(arm1022_coherent_kern_range)
201 /* FALLTHROUGH */
202
203/*
204 * coherent_user_range(start, end)
205 *
206 * Ensure coherency between the Icache and the Dcache in the
207 * region described by start. If you have non-snooping
208 * Harvard caches, you need to implement this function.
209 *
210 * - start - virtual start address
211 * - end - virtual end address
212 */
213ENTRY(arm1022_coherent_user_range)
214 mov ip, #0
215 bic r0, r0, #CACHE_DLINESIZE - 1
2161:
217#ifndef CONFIG_CPU_DCACHE_DISABLE
218 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
219#endif
220#ifndef CONFIG_CPU_ICACHE_DISABLE
221 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
222#endif
223 add r0, r0, #CACHE_DLINESIZE
224 cmp r0, r1
225 blo 1b
226 mcr p15, 0, ip, c7, c10, 4 @ drain WB
227 mov r0, #0
228 mov pc, lr
229
230/*
231 * flush_kern_dcache_area(void *addr, size_t size)
232 *
233 * Ensure no D cache aliasing occurs, either with itself or
234 * the I cache
235 *
236 * - addr - kernel address
237 * - size - region size
238 */
239ENTRY(arm1022_flush_kern_dcache_area)
240 mov ip, #0
241#ifndef CONFIG_CPU_DCACHE_DISABLE
242 add r1, r0, r1
2431: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
244 add r0, r0, #CACHE_DLINESIZE
245 cmp r0, r1
246 blo 1b
247#endif
248 mcr p15, 0, ip, c7, c10, 4 @ drain WB
249 mov pc, lr
250
251/*
252 * dma_inv_range(start, end)
253 *
254 * Invalidate (discard) the specified virtual address range.
255 * May not write back any entries. If 'start' or 'end'
256 * are not cache line aligned, those lines must be written
257 * back.
258 *
259 * - start - virtual start address
260 * - end - virtual end address
261 *
262 * (same as v4wb)
263 */
264arm1022_dma_inv_range:
265 mov ip, #0
266#ifndef CONFIG_CPU_DCACHE_DISABLE
267 tst r0, #CACHE_DLINESIZE - 1
268 bic r0, r0, #CACHE_DLINESIZE - 1
269 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
270 tst r1, #CACHE_DLINESIZE - 1
271 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
2721: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
273 add r0, r0, #CACHE_DLINESIZE
274 cmp r0, r1
275 blo 1b
276#endif
277 mcr p15, 0, ip, c7, c10, 4 @ drain WB
278 mov pc, lr
279
280/*
281 * dma_clean_range(start, end)
282 *
283 * Clean the specified virtual address range.
284 *
285 * - start - virtual start address
286 * - end - virtual end address
287 *
288 * (same as v4wb)
289 */
290arm1022_dma_clean_range:
291 mov ip, #0
292#ifndef CONFIG_CPU_DCACHE_DISABLE
293 bic r0, r0, #CACHE_DLINESIZE - 1
2941: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
295 add r0, r0, #CACHE_DLINESIZE
296 cmp r0, r1
297 blo 1b
298#endif
299 mcr p15, 0, ip, c7, c10, 4 @ drain WB
300 mov pc, lr
301
302/*
303 * dma_flush_range(start, end)
304 *
305 * Clean and invalidate the specified virtual address range.
306 *
307 * - start - virtual start address
308 * - end - virtual end address
309 */
310ENTRY(arm1022_dma_flush_range)
311 mov ip, #0
312#ifndef CONFIG_CPU_DCACHE_DISABLE
313 bic r0, r0, #CACHE_DLINESIZE - 1
3141: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
315 add r0, r0, #CACHE_DLINESIZE
316 cmp r0, r1
317 blo 1b
318#endif
319 mcr p15, 0, ip, c7, c10, 4 @ drain WB
320 mov pc, lr
321
322/*
323 * dma_map_area(start, size, dir)
324 * - start - kernel virtual start address
325 * - size - size of region
326 * - dir - DMA direction
327 */
328ENTRY(arm1022_dma_map_area)
329 add r1, r1, r0
330 cmp r2, #DMA_TO_DEVICE
331 beq arm1022_dma_clean_range
332 bcs arm1022_dma_inv_range
333 b arm1022_dma_flush_range
334ENDPROC(arm1022_dma_map_area)
335
336/*
337 * dma_unmap_area(start, size, dir)
338 * - start - kernel virtual start address
339 * - size - size of region
340 * - dir - DMA direction
341 */
342ENTRY(arm1022_dma_unmap_area)
343 mov pc, lr
344ENDPROC(arm1022_dma_unmap_area)
345
346 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
347 define_cache_functions arm1022
348
349 .align 5
350ENTRY(cpu_arm1022_dcache_clean_area)
351#ifndef CONFIG_CPU_DCACHE_DISABLE
352 mov ip, #0
3531: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
354 add r0, r0, #CACHE_DLINESIZE
355 subs r1, r1, #CACHE_DLINESIZE
356 bhi 1b
357#endif
358 mov pc, lr
359
360/* =============================== PageTable ============================== */
361
362/*
363 * cpu_arm1022_switch_mm(pgd)
364 *
365 * Set the translation base pointer to be as described by pgd.
366 *
367 * pgd: new page tables
368 */
369 .align 5
370ENTRY(cpu_arm1022_switch_mm)
371#ifdef CONFIG_MMU
372#ifndef CONFIG_CPU_DCACHE_DISABLE
373 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments
3741: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
3752: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
376 subs r3, r3, #1 << 26
377 bcs 2b @ entries 63 to 0
378 subs r1, r1, #1 << 5
379 bcs 1b @ segments 15 to 0
380#endif
381 mov r1, #0
382#ifndef CONFIG_CPU_ICACHE_DISABLE
383 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
384#endif
385 mcr p15, 0, r1, c7, c10, 4 @ drain WB
386 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
387 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
388#endif
389 mov pc, lr
390
391/*
392 * cpu_arm1022_set_pte_ext(ptep, pte, ext)
393 *
394 * Set a PTE and flush it out
395 */
396 .align 5
397ENTRY(cpu_arm1022_set_pte_ext)
398#ifdef CONFIG_MMU
399 armv3_set_pte_ext
400 mov r0, r0
401#ifndef CONFIG_CPU_DCACHE_DISABLE
402 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
403#endif
404#endif /* CONFIG_MMU */
405 mov pc, lr
406
407 __CPUINIT
408
409 .type __arm1022_setup, #function
410__arm1022_setup:
411 mov r0, #0
412 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
413 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
414#ifdef CONFIG_MMU
415 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
416#endif
417 adr r5, arm1022_crval
418 ldmia r5, {r5, r6}
419 mrc p15, 0, r0, c1, c0 @ get control register v4
420 bic r0, r0, r5
421 orr r0, r0, r6
422#ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
423 orr r0, r0, #0x4000 @ .R..............
424#endif
425 mov pc, lr
426 .size __arm1022_setup, . - __arm1022_setup
427
428 /*
429 * R
430 * .RVI ZFRS BLDP WCAM
431 * .011 1001 ..11 0101
432 *
433 */
434 .type arm1022_crval, #object
435arm1022_crval:
436 crval clear=0x00007f3f, mmuset=0x00003935, ucset=0x00001930
437
438 __INITDATA
439 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
440 define_processor_functions arm1022, dabort=v4t_early_abort, pabort=legacy_pabort
441
442 .section ".rodata"
443
444 string cpu_arch_name, "armv5te"
445 string cpu_elf_name, "v5"
446 string cpu_arm1022_name, "ARM1022"
447
448 .align
449
450 .section ".proc.info.init", #alloc, #execinstr
451
452 .type __arm1022_proc_info,#object
453__arm1022_proc_info:
454 .long 0x4105a220 @ ARM 1022E (v5TE)
455 .long 0xff0ffff0
456 .long PMD_TYPE_SECT | \
457 PMD_BIT4 | \
458 PMD_SECT_AP_WRITE | \
459 PMD_SECT_AP_READ
460 .long PMD_TYPE_SECT | \
461 PMD_BIT4 | \
462 PMD_SECT_AP_WRITE | \
463 PMD_SECT_AP_READ
464 b __arm1022_setup
465 .long cpu_arch_name
466 .long cpu_elf_name
467 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_EDSP
468 .long cpu_arm1022_name
469 .long arm1022_processor_functions
470 .long v4wbi_tlb_fns
471 .long v4wb_user_fns
472 .long arm1022_cache_fns
473 .size __arm1022_proc_info, . - __arm1022_proc_info