2 * linux/arch/arm/mm/proc-arm1020.S: MMU functions for ARM1020
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.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 * These are the low level assembler for performing cache and TLB
24 * functions on the arm1020.
26 #include <linux/linkage.h>
27 #include <linux/init.h>
28 #include <asm/assembler.h>
29 #include <asm/asm-offsets.h>
30 #include <asm/hwcap.h>
31 #include <asm/pgtable-hwdef.h>
32 #include <asm/pgtable.h>
33 #include <asm/ptrace.h>
35 #include "proc-macros.S"
38 * This is the maximum size of an area which will be invalidated
39 * using the single invalidate entry instructions. Anything larger
40 * than this, and we go for the whole cache.
42 * This value should be chosen such that we choose the cheapest
45 #define MAX_AREA_SIZE 32768
48 * The size of one data cache line.
50 #define CACHE_DLINESIZE 32
53 * The number of data cache segments.
55 #define CACHE_DSEGMENTS 16
58 * The number of lines in a cache segment.
60 #define CACHE_DENTRIES 64
63 * This is the size at which it becomes more efficient to
64 * clean the whole cache, rather than using the individual
65 * cache line maintenance instructions.
67 #define CACHE_DLIMIT 32768
71 * cpu_arm1020_proc_init()
73 ENTRY(cpu_arm1020_proc_init)
77 * cpu_arm1020_proc_fin()
79 ENTRY(cpu_arm1020_proc_fin)
80 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
81 bic r0, r0, #0x1000 @ ...i............
82 bic r0, r0, #0x000e @ ............wca.
83 mcr p15, 0, r0, c1, c0, 0 @ disable caches
87 * cpu_arm1020_reset(loc)
89 * Perform a soft reset of the system. Put the CPU into the
90 * same state as it would be if it had been reset, and branch
91 * to what would be the reset vector.
93 * loc: location to jump to for soft reset
96 .pushsection .idmap.text, "ax"
97 ENTRY(cpu_arm1020_reset)
99 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
100 mcr p15, 0, ip, c7, c10, 4 @ drain WB
102 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
104 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
105 bic ip, ip, #0x000f @ ............wcam
106 bic ip, ip, #0x1100 @ ...i...s........
107 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
109 ENDPROC(cpu_arm1020_reset)
113 * cpu_arm1020_do_idle()
116 ENTRY(cpu_arm1020_do_idle)
117 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
120 /* ================================= CACHE ================================ */
127 * Unconditionally clean and invalidate the entire icache.
129 ENTRY(arm1020_flush_icache_all)
130 #ifndef CONFIG_CPU_ICACHE_DISABLE
132 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
135 ENDPROC(arm1020_flush_icache_all)
138 * flush_user_cache_all()
140 * Invalidate all cache entries in a particular address
143 ENTRY(arm1020_flush_user_cache_all)
146 * flush_kern_cache_all()
148 * Clean and invalidate the entire cache.
150 ENTRY(arm1020_flush_kern_cache_all)
154 #ifndef CONFIG_CPU_DCACHE_DISABLE
155 mcr p15, 0, ip, c7, c10, 4 @ drain WB
156 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments
157 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
158 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
159 mcr p15, 0, ip, c7, c10, 4 @ drain WB
160 subs r3, r3, #1 << 26
161 bcs 2b @ entries 63 to 0
163 bcs 1b @ segments 15 to 0
166 #ifndef CONFIG_CPU_ICACHE_DISABLE
167 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
169 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
173 * flush_user_cache_range(start, end, flags)
175 * Invalidate a range of cache entries in the specified
178 * - start - start address (inclusive)
179 * - end - end address (exclusive)
180 * - flags - vm_flags for this space
182 ENTRY(arm1020_flush_user_cache_range)
184 sub r3, r1, r0 @ calculate total size
185 cmp r3, #CACHE_DLIMIT
186 bhs __flush_whole_cache
188 #ifndef CONFIG_CPU_DCACHE_DISABLE
189 mcr p15, 0, ip, c7, c10, 4
190 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
191 mcr p15, 0, ip, c7, c10, 4 @ drain WB
192 add r0, r0, #CACHE_DLINESIZE
197 #ifndef CONFIG_CPU_ICACHE_DISABLE
198 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
200 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
204 * coherent_kern_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(arm1020_coherent_kern_range)
217 * coherent_user_range(start, end)
219 * Ensure coherency between the Icache and the Dcache in the
220 * region described by start. If you have non-snooping
221 * Harvard caches, you need to implement this function.
223 * - start - virtual start address
224 * - end - virtual end address
226 ENTRY(arm1020_coherent_user_range)
228 bic r0, r0, #CACHE_DLINESIZE - 1
229 mcr p15, 0, ip, c7, c10, 4
231 #ifndef CONFIG_CPU_DCACHE_DISABLE
232 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
233 mcr p15, 0, ip, c7, c10, 4 @ drain WB
235 #ifndef CONFIG_CPU_ICACHE_DISABLE
236 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
238 add r0, r0, #CACHE_DLINESIZE
241 mcr p15, 0, ip, c7, c10, 4 @ drain WB
246 * flush_kern_dcache_area(void *addr, size_t size)
248 * Ensure no D cache aliasing occurs, either with itself or
251 * - addr - kernel address
252 * - size - region size
254 ENTRY(arm1020_flush_kern_dcache_area)
256 #ifndef CONFIG_CPU_DCACHE_DISABLE
258 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
259 mcr p15, 0, ip, c7, c10, 4 @ drain WB
260 add r0, r0, #CACHE_DLINESIZE
264 mcr p15, 0, ip, c7, c10, 4 @ drain WB
268 * dma_inv_range(start, end)
270 * Invalidate (discard) the specified virtual address range.
271 * May not write back any entries. If 'start' or 'end'
272 * are not cache line aligned, those lines must be written
275 * - start - virtual start address
276 * - end - virtual end address
280 arm1020_dma_inv_range:
282 #ifndef CONFIG_CPU_DCACHE_DISABLE
283 tst r0, #CACHE_DLINESIZE - 1
284 bic r0, r0, #CACHE_DLINESIZE - 1
285 mcrne p15, 0, ip, c7, c10, 4
286 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
287 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
288 tst r1, #CACHE_DLINESIZE - 1
289 mcrne p15, 0, ip, c7, c10, 4
290 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
291 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
292 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
293 add r0, r0, #CACHE_DLINESIZE
297 mcr p15, 0, ip, c7, c10, 4 @ drain WB
301 * dma_clean_range(start, end)
303 * Clean the specified virtual address range.
305 * - start - virtual start address
306 * - end - virtual end address
310 arm1020_dma_clean_range:
312 #ifndef CONFIG_CPU_DCACHE_DISABLE
313 bic r0, r0, #CACHE_DLINESIZE - 1
314 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
315 mcr p15, 0, ip, c7, c10, 4 @ drain WB
316 add r0, r0, #CACHE_DLINESIZE
320 mcr p15, 0, ip, c7, c10, 4 @ drain WB
324 * dma_flush_range(start, end)
326 * Clean and invalidate the specified virtual address range.
328 * - start - virtual start address
329 * - end - virtual end address
331 ENTRY(arm1020_dma_flush_range)
333 #ifndef CONFIG_CPU_DCACHE_DISABLE
334 bic r0, r0, #CACHE_DLINESIZE - 1
335 mcr p15, 0, ip, c7, c10, 4
336 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
337 mcr p15, 0, ip, c7, c10, 4 @ drain WB
338 add r0, r0, #CACHE_DLINESIZE
342 mcr p15, 0, ip, c7, c10, 4 @ drain WB
346 * dma_map_area(start, size, dir)
347 * - start - kernel virtual start address
348 * - size - size of region
349 * - dir - DMA direction
351 ENTRY(arm1020_dma_map_area)
353 cmp r2, #DMA_TO_DEVICE
354 beq arm1020_dma_clean_range
355 bcs arm1020_dma_inv_range
356 b arm1020_dma_flush_range
357 ENDPROC(arm1020_dma_map_area)
360 * dma_unmap_area(start, size, dir)
361 * - start - kernel virtual start address
362 * - size - size of region
363 * - dir - DMA direction
365 ENTRY(arm1020_dma_unmap_area)
367 ENDPROC(arm1020_dma_unmap_area)
369 .globl arm1020_flush_kern_cache_louis
370 .equ arm1020_flush_kern_cache_louis, arm1020_flush_kern_cache_all
372 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
373 define_cache_functions arm1020
376 ENTRY(cpu_arm1020_dcache_clean_area)
377 #ifndef CONFIG_CPU_DCACHE_DISABLE
379 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
380 mcr p15, 0, ip, c7, c10, 4 @ drain WB
381 add r0, r0, #CACHE_DLINESIZE
382 subs r1, r1, #CACHE_DLINESIZE
387 /* =============================== PageTable ============================== */
390 * cpu_arm1020_switch_mm(pgd)
392 * Set the translation base pointer to be as described by pgd.
394 * pgd: new page tables
397 ENTRY(cpu_arm1020_switch_mm)
399 #ifndef CONFIG_CPU_DCACHE_DISABLE
400 mcr p15, 0, r3, c7, c10, 4
401 mov r1, #0xF @ 16 segments
402 1: mov r3, #0x3F @ 64 entries
403 2: mov ip, r3, LSL #26 @ shift up entry
404 orr ip, ip, r1, LSL #5 @ shift in/up index
405 mcr p15, 0, ip, c7, c14, 2 @ Clean & Inval DCache entry
407 mcr p15, 0, ip, c7, c10, 4
410 bge 2b @ entries 3F to 0
413 bge 1b @ segments 15 to 0
417 #ifndef CONFIG_CPU_ICACHE_DISABLE
418 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
420 mcr p15, 0, r1, c7, c10, 4 @ drain WB
421 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
422 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
423 #endif /* CONFIG_MMU */
427 * cpu_arm1020_set_pte(ptep, pte)
429 * Set a PTE and flush it out
432 ENTRY(cpu_arm1020_set_pte_ext)
436 #ifndef CONFIG_CPU_DCACHE_DISABLE
437 mcr p15, 0, r0, c7, c10, 4
438 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
440 mcr p15, 0, r0, c7, c10, 4 @ drain WB
441 #endif /* CONFIG_MMU */
444 .type __arm1020_setup, #function
447 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
448 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
450 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
453 adr r5, arm1020_crval
455 mrc p15, 0, r0, c1, c0 @ get control register v4
458 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
459 orr r0, r0, #0x4000 @ .R.. .... .... ....
462 .size __arm1020_setup, . - __arm1020_setup
466 * .RVI ZFRS BLDP WCAM
467 * .011 1001 ..11 0101
469 .type arm1020_crval, #object
471 crval clear=0x0000593f, mmuset=0x00003935, ucset=0x00001930
474 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
475 define_processor_functions arm1020, dabort=v4t_early_abort, pabort=legacy_pabort
480 string cpu_arch_name, "armv5t"
481 string cpu_elf_name, "v5"
483 .type cpu_arm1020_name, #object
486 #ifndef CONFIG_CPU_ICACHE_DISABLE
489 #ifndef CONFIG_CPU_DCACHE_DISABLE
491 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
497 #ifndef CONFIG_CPU_BPREDICT_DISABLE
500 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
504 .size cpu_arm1020_name, . - cpu_arm1020_name
508 .section ".proc.info.init", #alloc
510 .type __arm1020_proc_info,#object
512 .long 0x4104a200 @ ARM 1020T (Architecture v5T)
514 .long PMD_TYPE_SECT | \
515 PMD_SECT_AP_WRITE | \
517 .long PMD_TYPE_SECT | \
518 PMD_SECT_AP_WRITE | \
520 initfn __arm1020_setup, __arm1020_proc_info
523 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
524 .long cpu_arm1020_name
525 .long arm1020_processor_functions
528 .long arm1020_cache_fns
529 .size __arm1020_proc_info, . - __arm1020_proc_info