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 .pushsection .idmap.text, "ax"
88 ENTRY(cpu_arm1022_reset)
90 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
91 mcr p15, 0, ip, c7, c10, 4 @ drain WB
93 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
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
100 ENDPROC(cpu_arm1022_reset)
104 * cpu_arm1022_do_idle()
107 ENTRY(cpu_arm1022_do_idle)
108 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
111 /* ================================= CACHE ================================ */
118 * Unconditionally clean and invalidate the entire icache.
120 ENTRY(arm1022_flush_icache_all)
121 #ifndef CONFIG_CPU_ICACHE_DISABLE
123 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
126 ENDPROC(arm1022_flush_icache_all)
129 * flush_user_cache_all()
131 * Invalidate all cache entries in a particular address
134 ENTRY(arm1022_flush_user_cache_all)
137 * flush_kern_cache_all()
139 * Clean and invalidate the entire cache.
141 ENTRY(arm1022_flush_kern_cache_all)
145 #ifndef CONFIG_CPU_DCACHE_DISABLE
146 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments
147 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
148 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
149 subs r3, r3, #1 << 26
150 bcs 2b @ entries 63 to 0
152 bcs 1b @ segments 15 to 0
155 #ifndef CONFIG_CPU_ICACHE_DISABLE
156 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
158 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
162 * flush_user_cache_range(start, end, flags)
164 * Invalidate a range of cache entries in the specified
167 * - start - start address (inclusive)
168 * - end - end address (exclusive)
169 * - flags - vm_flags for this space
171 ENTRY(arm1022_flush_user_cache_range)
173 sub r3, r1, r0 @ calculate total size
174 cmp r3, #CACHE_DLIMIT
175 bhs __flush_whole_cache
177 #ifndef CONFIG_CPU_DCACHE_DISABLE
178 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
179 add r0, r0, #CACHE_DLINESIZE
184 #ifndef CONFIG_CPU_ICACHE_DISABLE
185 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
187 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
191 * coherent_kern_range(start, end)
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.
197 * - start - virtual start address
198 * - end - virtual end address
200 ENTRY(arm1022_coherent_kern_range)
204 * coherent_user_range(start, end)
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.
210 * - start - virtual start address
211 * - end - virtual end address
213 ENTRY(arm1022_coherent_user_range)
215 bic r0, r0, #CACHE_DLINESIZE - 1
217 #ifndef CONFIG_CPU_DCACHE_DISABLE
218 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
220 #ifndef CONFIG_CPU_ICACHE_DISABLE
221 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
223 add r0, r0, #CACHE_DLINESIZE
226 mcr p15, 0, ip, c7, c10, 4 @ drain WB
231 * flush_kern_dcache_area(void *addr, size_t size)
233 * Ensure no D cache aliasing occurs, either with itself or
236 * - addr - kernel address
237 * - size - region size
239 ENTRY(arm1022_flush_kern_dcache_area)
241 #ifndef CONFIG_CPU_DCACHE_DISABLE
243 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
244 add r0, r0, #CACHE_DLINESIZE
248 mcr p15, 0, ip, c7, c10, 4 @ drain WB
252 * dma_inv_range(start, end)
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
259 * - start - virtual start address
260 * - end - virtual end address
264 arm1022_dma_inv_range:
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
272 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
273 add r0, r0, #CACHE_DLINESIZE
277 mcr p15, 0, ip, c7, c10, 4 @ drain WB
281 * dma_clean_range(start, end)
283 * Clean the specified virtual address range.
285 * - start - virtual start address
286 * - end - virtual end address
290 arm1022_dma_clean_range:
292 #ifndef CONFIG_CPU_DCACHE_DISABLE
293 bic r0, r0, #CACHE_DLINESIZE - 1
294 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
295 add r0, r0, #CACHE_DLINESIZE
299 mcr p15, 0, ip, c7, c10, 4 @ drain WB
303 * dma_flush_range(start, end)
305 * Clean and invalidate the specified virtual address range.
307 * - start - virtual start address
308 * - end - virtual end address
310 ENTRY(arm1022_dma_flush_range)
312 #ifndef CONFIG_CPU_DCACHE_DISABLE
313 bic r0, r0, #CACHE_DLINESIZE - 1
314 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
315 add r0, r0, #CACHE_DLINESIZE
319 mcr p15, 0, ip, c7, c10, 4 @ drain WB
323 * dma_map_area(start, size, dir)
324 * - start - kernel virtual start address
325 * - size - size of region
326 * - dir - DMA direction
328 ENTRY(arm1022_dma_map_area)
330 cmp r2, #DMA_TO_DEVICE
331 beq arm1022_dma_clean_range
332 bcs arm1022_dma_inv_range
333 b arm1022_dma_flush_range
334 ENDPROC(arm1022_dma_map_area)
337 * dma_unmap_area(start, size, dir)
338 * - start - kernel virtual start address
339 * - size - size of region
340 * - dir - DMA direction
342 ENTRY(arm1022_dma_unmap_area)
344 ENDPROC(arm1022_dma_unmap_area)
346 .globl arm1022_flush_kern_cache_louis
347 .equ arm1022_flush_kern_cache_louis, arm1022_flush_kern_cache_all
349 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
350 define_cache_functions arm1022
353 ENTRY(cpu_arm1022_dcache_clean_area)
354 #ifndef CONFIG_CPU_DCACHE_DISABLE
356 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
357 add r0, r0, #CACHE_DLINESIZE
358 subs r1, r1, #CACHE_DLINESIZE
363 /* =============================== PageTable ============================== */
366 * cpu_arm1022_switch_mm(pgd)
368 * Set the translation base pointer to be as described by pgd.
370 * pgd: new page tables
373 ENTRY(cpu_arm1022_switch_mm)
375 #ifndef CONFIG_CPU_DCACHE_DISABLE
376 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments
377 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
378 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
379 subs r3, r3, #1 << 26
380 bcs 2b @ entries 63 to 0
382 bcs 1b @ segments 15 to 0
385 #ifndef CONFIG_CPU_ICACHE_DISABLE
386 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
388 mcr p15, 0, r1, c7, c10, 4 @ drain WB
389 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
390 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
395 * cpu_arm1022_set_pte_ext(ptep, pte, ext)
397 * Set a PTE and flush it out
400 ENTRY(cpu_arm1022_set_pte_ext)
404 #ifndef CONFIG_CPU_DCACHE_DISABLE
405 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
407 #endif /* CONFIG_MMU */
410 .type __arm1022_setup, #function
413 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
414 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
416 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
418 adr r5, arm1022_crval
420 mrc p15, 0, r0, c1, c0 @ get control register v4
423 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
424 orr r0, r0, #0x4000 @ .R..............
427 .size __arm1022_setup, . - __arm1022_setup
431 * .RVI ZFRS BLDP WCAM
432 * .011 1001 ..11 0101
435 .type arm1022_crval, #object
437 crval clear=0x00007f3f, mmuset=0x00003935, ucset=0x00001930
440 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
441 define_processor_functions arm1022, dabort=v4t_early_abort, pabort=legacy_pabort
445 string cpu_arch_name, "armv5te"
446 string cpu_elf_name, "v5"
447 string cpu_arm1022_name, "ARM1022"
451 .section ".proc.info.init", #alloc
453 .type __arm1022_proc_info,#object
455 .long 0x4105a220 @ ARM 1022E (v5TE)
457 .long PMD_TYPE_SECT | \
459 PMD_SECT_AP_WRITE | \
461 .long PMD_TYPE_SECT | \
463 PMD_SECT_AP_WRITE | \
465 initfn __arm1022_setup, __arm1022_proc_info
468 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_EDSP
469 .long cpu_arm1022_name
470 .long arm1022_processor_functions
473 .long arm1022_cache_fns
474 .size __arm1022_proc_info, . - __arm1022_proc_info