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 * CONFIG_CPU_ARM1020_CPU_IDLE -> nohlt
28 #include <linux/linkage.h>
29 #include <linux/init.h>
30 #include <asm/assembler.h>
31 #include <asm/asm-offsets.h>
32 #include <asm/hwcap.h>
33 #include <asm/pgtable-hwdef.h>
34 #include <asm/pgtable.h>
35 #include <asm/ptrace.h>
37 #include "proc-macros.S"
40 * This is the maximum size of an area which will be invalidated
41 * using the single invalidate entry instructions. Anything larger
42 * than this, and we go for the whole cache.
44 * This value should be chosen such that we choose the cheapest
47 #define MAX_AREA_SIZE 32768
50 * The size of one data cache line.
52 #define CACHE_DLINESIZE 32
55 * The number of data cache segments.
57 #define CACHE_DSEGMENTS 16
60 * The number of lines in a cache segment.
62 #define CACHE_DENTRIES 64
65 * This is the size at which it becomes more efficient to
66 * clean the whole cache, rather than using the individual
67 * cache line maintenance instructions.
69 #define CACHE_DLIMIT 32768
73 * cpu_arm1020_proc_init()
75 ENTRY(cpu_arm1020_proc_init)
79 * cpu_arm1020_proc_fin()
81 ENTRY(cpu_arm1020_proc_fin)
82 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
83 bic r0, r0, #0x1000 @ ...i............
84 bic r0, r0, #0x000e @ ............wca.
85 mcr p15, 0, r0, c1, c0, 0 @ disable caches
89 * cpu_arm1020_reset(loc)
91 * Perform a soft reset of the system. Put the CPU into the
92 * same state as it would be if it had been reset, and branch
93 * to what would be the reset vector.
95 * loc: location to jump to for soft reset
98 .pushsection .idmap.text, "ax"
99 ENTRY(cpu_arm1020_reset)
101 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
102 mcr p15, 0, ip, c7, c10, 4 @ drain WB
104 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
106 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
107 bic ip, ip, #0x000f @ ............wcam
108 bic ip, ip, #0x1100 @ ...i...s........
109 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
111 ENDPROC(cpu_arm1020_reset)
115 * cpu_arm1020_do_idle()
118 ENTRY(cpu_arm1020_do_idle)
119 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
122 /* ================================= CACHE ================================ */
129 * Unconditionally clean and invalidate the entire icache.
131 ENTRY(arm1020_flush_icache_all)
132 #ifndef CONFIG_CPU_ICACHE_DISABLE
134 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
137 ENDPROC(arm1020_flush_icache_all)
140 * flush_user_cache_all()
142 * Invalidate all cache entries in a particular address
145 ENTRY(arm1020_flush_user_cache_all)
148 * flush_kern_cache_all()
150 * Clean and invalidate the entire cache.
152 ENTRY(arm1020_flush_kern_cache_all)
156 #ifndef CONFIG_CPU_DCACHE_DISABLE
157 mcr p15, 0, ip, c7, c10, 4 @ drain WB
158 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments
159 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
160 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
161 mcr p15, 0, ip, c7, c10, 4 @ drain WB
162 subs r3, r3, #1 << 26
163 bcs 2b @ entries 63 to 0
165 bcs 1b @ segments 15 to 0
168 #ifndef CONFIG_CPU_ICACHE_DISABLE
169 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
171 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
175 * flush_user_cache_range(start, end, flags)
177 * Invalidate a range of cache entries in the specified
180 * - start - start address (inclusive)
181 * - end - end address (exclusive)
182 * - flags - vm_flags for this space
184 ENTRY(arm1020_flush_user_cache_range)
186 sub r3, r1, r0 @ calculate total size
187 cmp r3, #CACHE_DLIMIT
188 bhs __flush_whole_cache
190 #ifndef CONFIG_CPU_DCACHE_DISABLE
191 mcr p15, 0, ip, c7, c10, 4
192 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
193 mcr p15, 0, ip, c7, c10, 4 @ drain WB
194 add r0, r0, #CACHE_DLINESIZE
199 #ifndef CONFIG_CPU_ICACHE_DISABLE
200 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
202 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
206 * coherent_kern_range(start, end)
208 * Ensure coherency between the Icache and the Dcache in the
209 * region described by start. If you have non-snooping
210 * Harvard caches, you need to implement this function.
212 * - start - virtual start address
213 * - end - virtual end address
215 ENTRY(arm1020_coherent_kern_range)
219 * coherent_user_range(start, end)
221 * Ensure coherency between the Icache and the Dcache in the
222 * region described by start. If you have non-snooping
223 * Harvard caches, you need to implement this function.
225 * - start - virtual start address
226 * - end - virtual end address
228 ENTRY(arm1020_coherent_user_range)
230 bic r0, r0, #CACHE_DLINESIZE - 1
231 mcr p15, 0, ip, c7, c10, 4
233 #ifndef CONFIG_CPU_DCACHE_DISABLE
234 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
235 mcr p15, 0, ip, c7, c10, 4 @ drain WB
237 #ifndef CONFIG_CPU_ICACHE_DISABLE
238 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
240 add r0, r0, #CACHE_DLINESIZE
243 mcr p15, 0, ip, c7, c10, 4 @ drain WB
247 * flush_kern_dcache_area(void *addr, size_t size)
249 * Ensure no D cache aliasing occurs, either with itself or
252 * - addr - kernel address
253 * - size - region size
255 ENTRY(arm1020_flush_kern_dcache_area)
257 #ifndef CONFIG_CPU_DCACHE_DISABLE
259 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
260 mcr p15, 0, ip, c7, c10, 4 @ drain WB
261 add r0, r0, #CACHE_DLINESIZE
265 mcr p15, 0, ip, c7, c10, 4 @ drain WB
269 * dma_inv_range(start, end)
271 * Invalidate (discard) the specified virtual address range.
272 * May not write back any entries. If 'start' or 'end'
273 * are not cache line aligned, those lines must be written
276 * - start - virtual start address
277 * - end - virtual end address
281 arm1020_dma_inv_range:
283 #ifndef CONFIG_CPU_DCACHE_DISABLE
284 tst r0, #CACHE_DLINESIZE - 1
285 bic r0, r0, #CACHE_DLINESIZE - 1
286 mcrne p15, 0, ip, c7, c10, 4
287 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
288 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
289 tst r1, #CACHE_DLINESIZE - 1
290 mcrne p15, 0, ip, c7, c10, 4
291 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
292 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
293 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
294 add r0, r0, #CACHE_DLINESIZE
298 mcr p15, 0, ip, c7, c10, 4 @ drain WB
302 * dma_clean_range(start, end)
304 * Clean the specified virtual address range.
306 * - start - virtual start address
307 * - end - virtual end address
311 arm1020_dma_clean_range:
313 #ifndef CONFIG_CPU_DCACHE_DISABLE
314 bic r0, r0, #CACHE_DLINESIZE - 1
315 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
316 mcr p15, 0, ip, c7, c10, 4 @ drain WB
317 add r0, r0, #CACHE_DLINESIZE
321 mcr p15, 0, ip, c7, c10, 4 @ drain WB
325 * dma_flush_range(start, end)
327 * Clean and invalidate the specified virtual address range.
329 * - start - virtual start address
330 * - end - virtual end address
332 ENTRY(arm1020_dma_flush_range)
334 #ifndef CONFIG_CPU_DCACHE_DISABLE
335 bic r0, r0, #CACHE_DLINESIZE - 1
336 mcr p15, 0, ip, c7, c10, 4
337 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
338 mcr p15, 0, ip, c7, c10, 4 @ drain WB
339 add r0, r0, #CACHE_DLINESIZE
343 mcr p15, 0, ip, c7, c10, 4 @ drain WB
347 * dma_map_area(start, size, dir)
348 * - start - kernel virtual start address
349 * - size - size of region
350 * - dir - DMA direction
352 ENTRY(arm1020_dma_map_area)
354 cmp r2, #DMA_TO_DEVICE
355 beq arm1020_dma_clean_range
356 bcs arm1020_dma_inv_range
357 b arm1020_dma_flush_range
358 ENDPROC(arm1020_dma_map_area)
361 * dma_unmap_area(start, size, dir)
362 * - start - kernel virtual start address
363 * - size - size of region
364 * - dir - DMA direction
366 ENTRY(arm1020_dma_unmap_area)
368 ENDPROC(arm1020_dma_unmap_area)
370 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
371 define_cache_functions arm1020
374 ENTRY(cpu_arm1020_dcache_clean_area)
375 #ifndef CONFIG_CPU_DCACHE_DISABLE
377 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
378 mcr p15, 0, ip, c7, c10, 4 @ drain WB
379 add r0, r0, #CACHE_DLINESIZE
380 subs r1, r1, #CACHE_DLINESIZE
385 /* =============================== PageTable ============================== */
388 * cpu_arm1020_switch_mm(pgd)
390 * Set the translation base pointer to be as described by pgd.
392 * pgd: new page tables
395 ENTRY(cpu_arm1020_switch_mm)
397 #ifndef CONFIG_CPU_DCACHE_DISABLE
398 mcr p15, 0, r3, c7, c10, 4
399 mov r1, #0xF @ 16 segments
400 1: mov r3, #0x3F @ 64 entries
401 2: mov ip, r3, LSL #26 @ shift up entry
402 orr ip, ip, r1, LSL #5 @ shift in/up index
403 mcr p15, 0, ip, c7, c14, 2 @ Clean & Inval DCache entry
405 mcr p15, 0, ip, c7, c10, 4
408 bge 2b @ entries 3F to 0
411 bge 1b @ segments 15 to 0
415 #ifndef CONFIG_CPU_ICACHE_DISABLE
416 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
418 mcr p15, 0, r1, c7, c10, 4 @ drain WB
419 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
420 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
421 #endif /* CONFIG_MMU */
425 * cpu_arm1020_set_pte(ptep, pte)
427 * Set a PTE and flush it out
430 ENTRY(cpu_arm1020_set_pte_ext)
434 #ifndef CONFIG_CPU_DCACHE_DISABLE
435 mcr p15, 0, r0, c7, c10, 4
436 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
438 mcr p15, 0, r0, c7, c10, 4 @ drain WB
439 #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, #execinstr
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 | \
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