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 ENTRY(cpu_arm1020_reset)
100 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
101 mcr p15, 0, ip, c7, c10, 4 @ drain WB
103 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
105 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
106 bic ip, ip, #0x000f @ ............wcam
107 bic ip, ip, #0x1100 @ ...i...s........
108 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
112 * cpu_arm1020_do_idle()
115 ENTRY(cpu_arm1020_do_idle)
116 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
119 /* ================================= CACHE ================================ */
126 * Unconditionally clean and invalidate the entire icache.
128 ENTRY(arm1020_flush_icache_all)
129 #ifndef CONFIG_CPU_ICACHE_DISABLE
131 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
134 ENDPROC(arm1020_flush_icache_all)
137 * flush_user_cache_all()
139 * Invalidate all cache entries in a particular address
142 ENTRY(arm1020_flush_user_cache_all)
145 * flush_kern_cache_all()
147 * Clean and invalidate the entire cache.
149 ENTRY(arm1020_flush_kern_cache_all)
153 #ifndef CONFIG_CPU_DCACHE_DISABLE
154 mcr p15, 0, ip, c7, c10, 4 @ drain WB
155 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments
156 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
157 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
158 mcr p15, 0, ip, c7, c10, 4 @ drain WB
159 subs r3, r3, #1 << 26
160 bcs 2b @ entries 63 to 0
162 bcs 1b @ segments 15 to 0
165 #ifndef CONFIG_CPU_ICACHE_DISABLE
166 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
168 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
172 * flush_user_cache_range(start, end, flags)
174 * Invalidate a range of cache entries in the specified
177 * - start - start address (inclusive)
178 * - end - end address (exclusive)
179 * - flags - vm_flags for this space
181 ENTRY(arm1020_flush_user_cache_range)
183 sub r3, r1, r0 @ calculate total size
184 cmp r3, #CACHE_DLIMIT
185 bhs __flush_whole_cache
187 #ifndef CONFIG_CPU_DCACHE_DISABLE
188 mcr p15, 0, ip, c7, c10, 4
189 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
190 mcr p15, 0, ip, c7, c10, 4 @ drain WB
191 add r0, r0, #CACHE_DLINESIZE
196 #ifndef CONFIG_CPU_ICACHE_DISABLE
197 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
199 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
203 * coherent_kern_range(start, end)
205 * Ensure coherency between the Icache and the Dcache in the
206 * region described by start. If you have non-snooping
207 * Harvard caches, you need to implement this function.
209 * - start - virtual start address
210 * - end - virtual end address
212 ENTRY(arm1020_coherent_kern_range)
216 * coherent_user_range(start, end)
218 * Ensure coherency between the Icache and the Dcache in the
219 * region described by start. If you have non-snooping
220 * Harvard caches, you need to implement this function.
222 * - start - virtual start address
223 * - end - virtual end address
225 ENTRY(arm1020_coherent_user_range)
227 bic r0, r0, #CACHE_DLINESIZE - 1
228 mcr p15, 0, ip, c7, c10, 4
230 #ifndef CONFIG_CPU_DCACHE_DISABLE
231 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
232 mcr p15, 0, ip, c7, c10, 4 @ drain WB
234 #ifndef CONFIG_CPU_ICACHE_DISABLE
235 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
237 add r0, r0, #CACHE_DLINESIZE
240 mcr p15, 0, ip, c7, c10, 4 @ drain WB
244 * flush_kern_dcache_area(void *addr, size_t size)
246 * Ensure no D cache aliasing occurs, either with itself or
249 * - addr - kernel address
250 * - size - region size
252 ENTRY(arm1020_flush_kern_dcache_area)
254 #ifndef CONFIG_CPU_DCACHE_DISABLE
256 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
257 mcr p15, 0, ip, c7, c10, 4 @ drain WB
258 add r0, r0, #CACHE_DLINESIZE
262 mcr p15, 0, ip, c7, c10, 4 @ drain WB
266 * dma_inv_range(start, end)
268 * Invalidate (discard) the specified virtual address range.
269 * May not write back any entries. If 'start' or 'end'
270 * are not cache line aligned, those lines must be written
273 * - start - virtual start address
274 * - end - virtual end address
278 arm1020_dma_inv_range:
280 #ifndef CONFIG_CPU_DCACHE_DISABLE
281 tst r0, #CACHE_DLINESIZE - 1
282 bic r0, r0, #CACHE_DLINESIZE - 1
283 mcrne p15, 0, ip, c7, c10, 4
284 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
285 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
286 tst r1, #CACHE_DLINESIZE - 1
287 mcrne p15, 0, ip, c7, c10, 4
288 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
289 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
290 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
291 add r0, r0, #CACHE_DLINESIZE
295 mcr p15, 0, ip, c7, c10, 4 @ drain WB
299 * dma_clean_range(start, end)
301 * Clean the specified virtual address range.
303 * - start - virtual start address
304 * - end - virtual end address
308 arm1020_dma_clean_range:
310 #ifndef CONFIG_CPU_DCACHE_DISABLE
311 bic r0, r0, #CACHE_DLINESIZE - 1
312 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
313 mcr p15, 0, ip, c7, c10, 4 @ drain WB
314 add r0, r0, #CACHE_DLINESIZE
318 mcr p15, 0, ip, c7, c10, 4 @ drain WB
322 * dma_flush_range(start, end)
324 * Clean and invalidate the specified virtual address range.
326 * - start - virtual start address
327 * - end - virtual end address
329 ENTRY(arm1020_dma_flush_range)
331 #ifndef CONFIG_CPU_DCACHE_DISABLE
332 bic r0, r0, #CACHE_DLINESIZE - 1
333 mcr p15, 0, ip, c7, c10, 4
334 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
335 mcr p15, 0, ip, c7, c10, 4 @ drain WB
336 add r0, r0, #CACHE_DLINESIZE
340 mcr p15, 0, ip, c7, c10, 4 @ drain WB
344 * dma_map_area(start, size, dir)
345 * - start - kernel virtual start address
346 * - size - size of region
347 * - dir - DMA direction
349 ENTRY(arm1020_dma_map_area)
351 cmp r2, #DMA_TO_DEVICE
352 beq arm1020_dma_clean_range
353 bcs arm1020_dma_inv_range
354 b arm1020_dma_flush_range
355 ENDPROC(arm1020_dma_map_area)
358 * dma_unmap_area(start, size, dir)
359 * - start - kernel virtual start address
360 * - size - size of region
361 * - dir - DMA direction
363 ENTRY(arm1020_dma_unmap_area)
365 ENDPROC(arm1020_dma_unmap_area)
367 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
368 define_cache_functions arm1020
371 ENTRY(cpu_arm1020_dcache_clean_area)
372 #ifndef CONFIG_CPU_DCACHE_DISABLE
374 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
375 mcr p15, 0, ip, c7, c10, 4 @ drain WB
376 add r0, r0, #CACHE_DLINESIZE
377 subs r1, r1, #CACHE_DLINESIZE
382 /* =============================== PageTable ============================== */
385 * cpu_arm1020_switch_mm(pgd)
387 * Set the translation base pointer to be as described by pgd.
389 * pgd: new page tables
392 ENTRY(cpu_arm1020_switch_mm)
394 #ifndef CONFIG_CPU_DCACHE_DISABLE
395 mcr p15, 0, r3, c7, c10, 4
396 mov r1, #0xF @ 16 segments
397 1: mov r3, #0x3F @ 64 entries
398 2: mov ip, r3, LSL #26 @ shift up entry
399 orr ip, ip, r1, LSL #5 @ shift in/up index
400 mcr p15, 0, ip, c7, c14, 2 @ Clean & Inval DCache entry
402 mcr p15, 0, ip, c7, c10, 4
405 bge 2b @ entries 3F to 0
408 bge 1b @ segments 15 to 0
412 #ifndef CONFIG_CPU_ICACHE_DISABLE
413 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
415 mcr p15, 0, r1, c7, c10, 4 @ drain WB
416 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
417 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
418 #endif /* CONFIG_MMU */
422 * cpu_arm1020_set_pte(ptep, pte)
424 * Set a PTE and flush it out
427 ENTRY(cpu_arm1020_set_pte_ext)
431 #ifndef CONFIG_CPU_DCACHE_DISABLE
432 mcr p15, 0, r0, c7, c10, 4
433 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
435 mcr p15, 0, r0, c7, c10, 4 @ drain WB
436 #endif /* CONFIG_MMU */
441 .type __arm1020_setup, #function
444 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
445 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
447 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
450 adr r5, arm1020_crval
452 mrc p15, 0, r0, c1, c0 @ get control register v4
455 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
456 orr r0, r0, #0x4000 @ .R.. .... .... ....
459 .size __arm1020_setup, . - __arm1020_setup
463 * .RVI ZFRS BLDP WCAM
464 * .011 1001 ..11 0101
466 .type arm1020_crval, #object
468 crval clear=0x0000593f, mmuset=0x00003935, ucset=0x00001930
471 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
472 define_processor_functions arm1020, dabort=v4t_early_abort, pabort=legacy_pabort
477 string cpu_arch_name, "armv5t"
478 string cpu_elf_name, "v5"
480 .type cpu_arm1020_name, #object
483 #ifndef CONFIG_CPU_ICACHE_DISABLE
486 #ifndef CONFIG_CPU_DCACHE_DISABLE
488 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
494 #ifndef CONFIG_CPU_BPREDICT_DISABLE
497 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
501 .size cpu_arm1020_name, . - cpu_arm1020_name
505 .section ".proc.info.init", #alloc, #execinstr
507 .type __arm1020_proc_info,#object
509 .long 0x4104a200 @ ARM 1020T (Architecture v5T)
511 .long PMD_TYPE_SECT | \
512 PMD_SECT_AP_WRITE | \
514 .long PMD_TYPE_SECT | \
515 PMD_SECT_AP_WRITE | \
520 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
521 .long cpu_arm1020_name
522 .long arm1020_processor_functions
525 .long arm1020_cache_fns
526 .size __arm1020_proc_info, . - __arm1020_proc_info