2 * linux/arch/arm/mm/proc-arm1022.S: MMU functions for ARM1022E
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 ARM1022E.
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 maintenance instructions.
58 #define CACHE_DLIMIT 32768
62 * cpu_arm1022_proc_init()
64 ENTRY(cpu_arm1022_proc_init)
68 * cpu_arm1022_proc_fin()
70 ENTRY(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
78 * cpu_arm1022_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_arm1022_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_arm1022_do_idle()
104 ENTRY(cpu_arm1022_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(arm1022_flush_icache_all)
118 #ifndef CONFIG_CPU_ICACHE_DISABLE
120 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
123 ENDPROC(arm1022_flush_icache_all)
126 * flush_user_cache_all()
128 * Invalidate all cache entries in a particular address
131 ENTRY(arm1022_flush_user_cache_all)
134 * flush_kern_cache_all()
136 * Clean and invalidate the entire cache.
138 ENTRY(arm1022_flush_kern_cache_all)
142 #ifndef CONFIG_CPU_DCACHE_DISABLE
143 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments
144 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
145 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
146 subs r3, r3, #1 << 26
147 bcs 2b @ entries 63 to 0
149 bcs 1b @ segments 15 to 0
152 #ifndef CONFIG_CPU_ICACHE_DISABLE
153 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
155 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
159 * flush_user_cache_range(start, end, flags)
161 * Invalidate a range of cache entries in the specified
164 * - start - start address (inclusive)
165 * - end - end address (exclusive)
166 * - flags - vm_flags for this space
168 ENTRY(arm1022_flush_user_cache_range)
170 sub r3, r1, r0 @ calculate total size
171 cmp r3, #CACHE_DLIMIT
172 bhs __flush_whole_cache
174 #ifndef CONFIG_CPU_DCACHE_DISABLE
175 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
176 add r0, r0, #CACHE_DLINESIZE
181 #ifndef CONFIG_CPU_ICACHE_DISABLE
182 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
184 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
188 * coherent_kern_range(start, end)
190 * Ensure coherency between the Icache and the Dcache in the
191 * region described by start. If you have non-snooping
192 * Harvard caches, you need to implement this function.
194 * - start - virtual start address
195 * - end - virtual end address
197 ENTRY(arm1022_coherent_kern_range)
201 * coherent_user_range(start, end)
203 * Ensure coherency between the Icache and the Dcache in the
204 * region described by start. If you have non-snooping
205 * Harvard caches, you need to implement this function.
207 * - start - virtual start address
208 * - end - virtual end address
210 ENTRY(arm1022_coherent_user_range)
212 bic r0, r0, #CACHE_DLINESIZE - 1
214 #ifndef CONFIG_CPU_DCACHE_DISABLE
215 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
217 #ifndef CONFIG_CPU_ICACHE_DISABLE
218 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
220 add r0, r0, #CACHE_DLINESIZE
223 mcr p15, 0, ip, c7, c10, 4 @ drain WB
227 * flush_kern_dcache_area(void *addr, size_t size)
229 * Ensure no D cache aliasing occurs, either with itself or
232 * - addr - kernel address
233 * - size - region size
235 ENTRY(arm1022_flush_kern_dcache_area)
237 #ifndef CONFIG_CPU_DCACHE_DISABLE
239 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
240 add r0, r0, #CACHE_DLINESIZE
244 mcr p15, 0, ip, c7, c10, 4 @ drain WB
248 * dma_inv_range(start, end)
250 * Invalidate (discard) the specified virtual address range.
251 * May not write back any entries. If 'start' or 'end'
252 * are not cache line aligned, those lines must be written
255 * - start - virtual start address
256 * - end - virtual end address
260 arm1022_dma_inv_range:
262 #ifndef CONFIG_CPU_DCACHE_DISABLE
263 tst r0, #CACHE_DLINESIZE - 1
264 bic r0, r0, #CACHE_DLINESIZE - 1
265 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
266 tst r1, #CACHE_DLINESIZE - 1
267 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
268 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
269 add r0, r0, #CACHE_DLINESIZE
273 mcr p15, 0, ip, c7, c10, 4 @ drain WB
277 * dma_clean_range(start, end)
279 * Clean the specified virtual address range.
281 * - start - virtual start address
282 * - end - virtual end address
286 arm1022_dma_clean_range:
288 #ifndef CONFIG_CPU_DCACHE_DISABLE
289 bic r0, r0, #CACHE_DLINESIZE - 1
290 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
291 add r0, r0, #CACHE_DLINESIZE
295 mcr p15, 0, ip, c7, c10, 4 @ drain WB
299 * dma_flush_range(start, end)
301 * Clean and invalidate the specified virtual address range.
303 * - start - virtual start address
304 * - end - virtual end address
306 ENTRY(arm1022_dma_flush_range)
308 #ifndef CONFIG_CPU_DCACHE_DISABLE
309 bic r0, r0, #CACHE_DLINESIZE - 1
310 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
311 add r0, r0, #CACHE_DLINESIZE
315 mcr p15, 0, ip, c7, c10, 4 @ drain WB
319 * dma_map_area(start, size, dir)
320 * - start - kernel virtual start address
321 * - size - size of region
322 * - dir - DMA direction
324 ENTRY(arm1022_dma_map_area)
326 cmp r2, #DMA_TO_DEVICE
327 beq arm1022_dma_clean_range
328 bcs arm1022_dma_inv_range
329 b arm1022_dma_flush_range
330 ENDPROC(arm1022_dma_map_area)
333 * dma_unmap_area(start, size, dir)
334 * - start - kernel virtual start address
335 * - size - size of region
336 * - dir - DMA direction
338 ENTRY(arm1022_dma_unmap_area)
340 ENDPROC(arm1022_dma_unmap_area)
342 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
343 define_cache_functions arm1022
346 ENTRY(cpu_arm1022_dcache_clean_area)
347 #ifndef CONFIG_CPU_DCACHE_DISABLE
349 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
350 add r0, r0, #CACHE_DLINESIZE
351 subs r1, r1, #CACHE_DLINESIZE
356 /* =============================== PageTable ============================== */
359 * cpu_arm1022_switch_mm(pgd)
361 * Set the translation base pointer to be as described by pgd.
363 * pgd: new page tables
366 ENTRY(cpu_arm1022_switch_mm)
368 #ifndef CONFIG_CPU_DCACHE_DISABLE
369 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments
370 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
371 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
372 subs r3, r3, #1 << 26
373 bcs 2b @ entries 63 to 0
375 bcs 1b @ segments 15 to 0
378 #ifndef CONFIG_CPU_ICACHE_DISABLE
379 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
381 mcr p15, 0, r1, c7, c10, 4 @ drain WB
382 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
383 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
388 * cpu_arm1022_set_pte_ext(ptep, pte, ext)
390 * Set a PTE and flush it out
393 ENTRY(cpu_arm1022_set_pte_ext)
397 #ifndef CONFIG_CPU_DCACHE_DISABLE
398 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
400 #endif /* CONFIG_MMU */
405 .type __arm1022_setup, #function
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
411 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
413 adr r5, arm1022_crval
415 mrc p15, 0, r0, c1, c0 @ get control register v4
418 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
419 orr r0, r0, #0x4000 @ .R..............
422 .size __arm1022_setup, . - __arm1022_setup
426 * .RVI ZFRS BLDP WCAM
427 * .011 1001 ..11 0101
430 .type arm1022_crval, #object
432 crval clear=0x00007f3f, mmuset=0x00003935, ucset=0x00001930
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
440 string cpu_arch_name, "armv5te"
441 string cpu_elf_name, "v5"
442 string cpu_arm1022_name, "ARM1022"
446 .section ".proc.info.init", #alloc, #execinstr
448 .type __arm1022_proc_info,#object
450 .long 0x4105a220 @ ARM 1022E (v5TE)
452 .long PMD_TYPE_SECT | \
454 PMD_SECT_AP_WRITE | \
456 .long PMD_TYPE_SECT | \
458 PMD_SECT_AP_WRITE | \
463 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_EDSP
464 .long cpu_arm1022_name
465 .long arm1022_processor_functions
468 .long arm1022_cache_fns
469 .size __arm1022_proc_info, . - __arm1022_proc_info