2 * linux/arch/arm/mm/proc-arm1026.S: MMU functions for ARM1026EJ-S
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.
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.
14 * These are the low level assembler for performing cache and TLB
15 * functions on the ARM1026EJ-S.
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"
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.
33 * This value should be chosen such that we choose the cheapest
36 #define MAX_AREA_SIZE 32768
39 * The size of one data cache line.
41 #define CACHE_DLINESIZE 32
44 * The number of data cache segments.
46 #define CACHE_DSEGMENTS 16
49 * The number of lines in a cache segment.
51 #define CACHE_DENTRIES 64
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 maintainence instructions.
58 #define CACHE_DLIMIT 32768
62 * cpu_arm1026_proc_init()
64 ENTRY(cpu_arm1026_proc_init)
68 * cpu_arm1026_proc_fin()
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
78 * cpu_arm1026_reset(loc)
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.
84 * loc: location to jump to for soft reset
87 ENTRY(cpu_arm1026_reset)
89 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
90 mcr p15, 0, ip, c7, c10, 4 @ drain WB
92 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
94 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
95 bic ip, ip, #0x000f @ ............wcam
96 bic ip, ip, #0x1100 @ ...i...s........
97 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
101 * cpu_arm1026_do_idle()
104 ENTRY(cpu_arm1026_do_idle)
105 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
108 /* ================================= CACHE ================================ */
115 * Unconditionally clean and invalidate the entire icache.
117 ENTRY(arm1026_flush_icache_all)
118 #ifndef CONFIG_CPU_ICACHE_DISABLE
120 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
123 ENDPROC(arm1026_flush_icache_all)
126 * flush_user_cache_all()
128 * Invalidate all cache entries in a particular address
131 ENTRY(arm1026_flush_user_cache_all)
134 * flush_kern_cache_all()
136 * Clean and invalidate the entire cache.
138 ENTRY(arm1026_flush_kern_cache_all)
142 #ifndef CONFIG_CPU_DCACHE_DISABLE
143 1: mrc p15, 0, r15, c7, c14, 3 @ test, clean, invalidate
147 #ifndef CONFIG_CPU_ICACHE_DISABLE
148 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
150 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
154 * flush_user_cache_range(start, end, flags)
156 * Invalidate a range of cache entries in the specified
159 * - start - start address (inclusive)
160 * - end - end address (exclusive)
161 * - flags - vm_flags for this space
163 ENTRY(arm1026_flush_user_cache_range)
165 sub r3, r1, r0 @ calculate total size
166 cmp r3, #CACHE_DLIMIT
167 bhs __flush_whole_cache
169 #ifndef CONFIG_CPU_DCACHE_DISABLE
170 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
171 add r0, r0, #CACHE_DLINESIZE
176 #ifndef CONFIG_CPU_ICACHE_DISABLE
177 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
179 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
183 * coherent_kern_range(start, end)
185 * Ensure coherency between the Icache and the Dcache in the
186 * region described by start. If you have non-snooping
187 * Harvard caches, you need to implement this function.
189 * - start - virtual start address
190 * - end - virtual end address
192 ENTRY(arm1026_coherent_kern_range)
195 * coherent_user_range(start, end)
197 * Ensure coherency between the Icache and the Dcache in the
198 * region described by start. If you have non-snooping
199 * Harvard caches, you need to implement this function.
201 * - start - virtual start address
202 * - end - virtual end address
204 ENTRY(arm1026_coherent_user_range)
206 bic r0, r0, #CACHE_DLINESIZE - 1
208 #ifndef CONFIG_CPU_DCACHE_DISABLE
209 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
211 #ifndef CONFIG_CPU_ICACHE_DISABLE
212 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
214 add r0, r0, #CACHE_DLINESIZE
217 mcr p15, 0, ip, c7, c10, 4 @ drain WB
221 * flush_kern_dcache_area(void *addr, size_t size)
223 * Ensure no D cache aliasing occurs, either with itself or
226 * - addr - kernel address
227 * - size - region size
229 ENTRY(arm1026_flush_kern_dcache_area)
231 #ifndef CONFIG_CPU_DCACHE_DISABLE
233 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
234 add r0, r0, #CACHE_DLINESIZE
238 mcr p15, 0, ip, c7, c10, 4 @ drain WB
242 * dma_inv_range(start, end)
244 * Invalidate (discard) the specified virtual address range.
245 * May not write back any entries. If 'start' or 'end'
246 * are not cache line aligned, those lines must be written
249 * - start - virtual start address
250 * - end - virtual end address
254 arm1026_dma_inv_range:
256 #ifndef CONFIG_CPU_DCACHE_DISABLE
257 tst r0, #CACHE_DLINESIZE - 1
258 bic r0, r0, #CACHE_DLINESIZE - 1
259 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
260 tst r1, #CACHE_DLINESIZE - 1
261 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
262 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
263 add r0, r0, #CACHE_DLINESIZE
267 mcr p15, 0, ip, c7, c10, 4 @ drain WB
271 * dma_clean_range(start, end)
273 * Clean the specified virtual address range.
275 * - start - virtual start address
276 * - end - virtual end address
280 arm1026_dma_clean_range:
282 #ifndef CONFIG_CPU_DCACHE_DISABLE
283 bic r0, r0, #CACHE_DLINESIZE - 1
284 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
285 add r0, r0, #CACHE_DLINESIZE
289 mcr p15, 0, ip, c7, c10, 4 @ drain WB
293 * dma_flush_range(start, end)
295 * Clean and invalidate the specified virtual address range.
297 * - start - virtual start address
298 * - end - virtual end address
300 ENTRY(arm1026_dma_flush_range)
302 #ifndef CONFIG_CPU_DCACHE_DISABLE
303 bic r0, r0, #CACHE_DLINESIZE - 1
304 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
305 add r0, r0, #CACHE_DLINESIZE
309 mcr p15, 0, ip, c7, c10, 4 @ drain WB
313 * dma_map_area(start, size, dir)
314 * - start - kernel virtual start address
315 * - size - size of region
316 * - dir - DMA direction
318 ENTRY(arm1026_dma_map_area)
320 cmp r2, #DMA_TO_DEVICE
321 beq arm1026_dma_clean_range
322 bcs arm1026_dma_inv_range
323 b arm1026_dma_flush_range
324 ENDPROC(arm1026_dma_map_area)
327 * dma_unmap_area(start, size, dir)
328 * - start - kernel virtual start address
329 * - size - size of region
330 * - dir - DMA direction
332 ENTRY(arm1026_dma_unmap_area)
334 ENDPROC(arm1026_dma_unmap_area)
336 ENTRY(arm1026_cache_fns)
337 .long arm1026_flush_icache_all
338 .long arm1026_flush_kern_cache_all
339 .long arm1026_flush_user_cache_all
340 .long arm1026_flush_user_cache_range
341 .long arm1026_coherent_kern_range
342 .long arm1026_coherent_user_range
343 .long arm1026_flush_kern_dcache_area
344 .long arm1026_dma_map_area
345 .long arm1026_dma_unmap_area
346 .long arm1026_dma_flush_range
349 ENTRY(cpu_arm1026_dcache_clean_area)
350 #ifndef CONFIG_CPU_DCACHE_DISABLE
352 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
353 add r0, r0, #CACHE_DLINESIZE
354 subs r1, r1, #CACHE_DLINESIZE
359 /* =============================== PageTable ============================== */
362 * cpu_arm1026_switch_mm(pgd)
364 * Set the translation base pointer to be as described by pgd.
366 * pgd: new page tables
369 ENTRY(cpu_arm1026_switch_mm)
372 #ifndef CONFIG_CPU_DCACHE_DISABLE
373 1: mrc p15, 0, r15, c7, c14, 3 @ test, clean, invalidate
376 #ifndef CONFIG_CPU_ICACHE_DISABLE
377 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
379 mcr p15, 0, r1, c7, c10, 4 @ drain WB
380 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
381 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
386 * cpu_arm1026_set_pte_ext(ptep, pte, ext)
388 * Set a PTE and flush it out
391 ENTRY(cpu_arm1026_set_pte_ext)
395 #ifndef CONFIG_CPU_DCACHE_DISABLE
396 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
398 #endif /* CONFIG_MMU */
404 .type __arm1026_setup, #function
407 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
408 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
410 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
411 mcr p15, 0, r4, c2, c0 @ load page table pointer
413 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
414 mov r0, #4 @ explicitly disable writeback
415 mcr p15, 7, r0, c15, c0, 0
417 adr r5, arm1026_crval
419 mrc p15, 0, r0, c1, c0 @ get control register v4
422 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
423 orr r0, r0, #0x4000 @ .R.. .... .... ....
426 .size __arm1026_setup, . - __arm1026_setup
430 * .RVI ZFRS BLDP WCAM
431 * .011 1001 ..11 0101
434 .type arm1026_crval, #object
436 crval clear=0x00007f3f, mmuset=0x00003935, ucset=0x00001934
441 * Purpose : Function pointers used to access above functions - all calls
444 .type arm1026_processor_functions, #object
445 arm1026_processor_functions:
446 .word v5t_early_abort
448 .word cpu_arm1026_proc_init
449 .word cpu_arm1026_proc_fin
450 .word cpu_arm1026_reset
451 .word cpu_arm1026_do_idle
452 .word cpu_arm1026_dcache_clean_area
453 .word cpu_arm1026_switch_mm
454 .word cpu_arm1026_set_pte_ext
458 .size arm1026_processor_functions, . - arm1026_processor_functions
462 .type cpu_arch_name, #object
465 .size cpu_arch_name, . - cpu_arch_name
467 .type cpu_elf_name, #object
470 .size cpu_elf_name, . - cpu_elf_name
473 .type cpu_arm1026_name, #object
476 .size cpu_arm1026_name, . - cpu_arm1026_name
480 .section ".proc.info.init", #alloc, #execinstr
482 .type __arm1026_proc_info,#object
484 .long 0x4106a260 @ ARM 1026EJ-S (v5TEJ)
486 .long PMD_TYPE_SECT | \
488 PMD_SECT_AP_WRITE | \
490 .long PMD_TYPE_SECT | \
492 PMD_SECT_AP_WRITE | \
497 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_JAVA
498 .long cpu_arm1026_name
499 .long arm1026_processor_functions
502 .long arm1026_cache_fns
503 .size __arm1026_proc_info, . - __arm1026_proc_info