| blob | 252b2503038de72131f84aa79a585111c67e1837 |
1 /*
2 * linux/arch/arm/mm/proc-arm926.S: MMU functions for ARM926EJ-S
3 *
4 * Copyright (C) 1999-2001 ARM Limited
5 * Copyright (C) 2000 Deep Blue Solutions Ltd.
6 * hacked for non-paged-MM by Hyok S. Choi, 2003.
7 *
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.
12 *
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.
17 *
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
21 *
22 *
23 * These are the low level assembler for performing cache and TLB
24 * functions on the arm926.
25 *
26 * CONFIG_CPU_ARM926_CPU_IDLE -> nohlt
27 */
28 #include <linux/linkage.h>
29 #include <linux/init.h>
30 #include <asm/assembler.h>
31 #include <asm/hwcap.h>
32 #include <asm/pgtable-hwdef.h>
33 #include <asm/pgtable.h>
34 #include <asm/page.h>
35 #include <asm/ptrace.h>
36 #include "proc-macros.S"
38 /*
39 * This is the maximum size of an area which will be invalidated
40 * using the single invalidate entry instructions. Anything larger
41 * than this, and we go for the whole cache.
42 *
43 * This value should be chosen such that we choose the cheapest
44 * alternative.
45 */
46 #define CACHE_DLIMIT 16384
48 /*
49 * the cache line size of the I and D cache
50 */
51 #define CACHE_DLINESIZE 32
53 .text
54 /*
55 * cpu_arm926_proc_init()
56 */
57 ENTRY(cpu_arm926_proc_init)
58 ret lr
60 /*
61 * cpu_arm926_proc_fin()
62 */
63 ENTRY(cpu_arm926_proc_fin)
64 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
65 bic r0, r0, #0x1000 @ ...i............
66 bic r0, r0, #0x000e @ ............wca.
67 mcr p15, 0, r0, c1, c0, 0 @ disable caches
68 ret lr
70 /*
71 * cpu_arm926_reset(loc)
72 *
73 * Perform a soft reset of the system. Put the CPU into the
74 * same state as it would be if it had been reset, and branch
75 * to what would be the reset vector.
76 *
77 * loc: location to jump to for soft reset
78 */
79 .align 5
80 .pushsection .idmap.text, "ax"
81 ENTRY(cpu_arm926_reset)
82 mov ip, #0
83 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
84 mcr p15, 0, ip, c7, c10, 4 @ drain WB
85 #ifdef CONFIG_MMU
86 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
87 #endif
88 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
89 bic ip, ip, #0x000f @ ............wcam
90 bic ip, ip, #0x1100 @ ...i...s........
91 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
92 ret r0
93 ENDPROC(cpu_arm926_reset)
94 .popsection
96 /*
97 * cpu_arm926_do_idle()
98 *
99 * Called with IRQs disabled
100 */
101 .align 10
102 ENTRY(cpu_arm926_do_idle)
103 mov r0, #0
104 mrc p15, 0, r1, c1, c0, 0 @ Read control register
105 mcr p15, 0, r0, c7, c10, 4 @ Drain write buffer
106 bic r2, r1, #1 << 12
107 mrs r3, cpsr @ Disable FIQs while Icache
108 orr ip, r3, #PSR_F_BIT @ is disabled
109 msr cpsr_c, ip
110 mcr p15, 0, r2, c1, c0, 0 @ Disable I cache
111 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
112 mcr p15, 0, r1, c1, c0, 0 @ Restore ICache enable
113 msr cpsr_c, r3 @ Restore FIQ state
114 ret lr
116 /*
117 * flush_icache_all()
118 *
119 * Unconditionally clean and invalidate the entire icache.
120 */
121 ENTRY(arm926_flush_icache_all)
122 mov r0, #0
123 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
124 ret lr
125 ENDPROC(arm926_flush_icache_all)
127 /*
128 * flush_user_cache_all()
129 *
130 * Clean and invalidate all cache entries in a particular
131 * address space.
132 */
133 ENTRY(arm926_flush_user_cache_all)
134 /* FALLTHROUGH */
136 /*
137 * flush_kern_cache_all()
138 *
139 * Clean and invalidate the entire cache.
140 */
141 ENTRY(arm926_flush_kern_cache_all)
142 mov r2, #VM_EXEC
143 mov ip, #0
144 __flush_whole_cache:
145 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
146 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
147 #else
148 1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate
149 bne 1b
150 #endif
151 tst r2, #VM_EXEC
152 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
153 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
154 ret lr
156 /*
157 * flush_user_cache_range(start, end, flags)
158 *
159 * Clean and invalidate a range of cache entries in the
160 * specified address range.
161 *
162 * - start - start address (inclusive)
163 * - end - end address (exclusive)
164 * - flags - vm_flags describing address space
165 */
166 ENTRY(arm926_flush_user_cache_range)
167 mov ip, #0
168 sub r3, r1, r0 @ calculate total size
169 cmp r3, #CACHE_DLIMIT
170 bgt __flush_whole_cache
171 1: tst r2, #VM_EXEC
172 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
173 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
174 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
175 add r0, r0, #CACHE_DLINESIZE
176 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
177 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
178 add r0, r0, #CACHE_DLINESIZE
179 #else
180 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
181 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
182 add r0, r0, #CACHE_DLINESIZE
183 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
184 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
185 add r0, r0, #CACHE_DLINESIZE
186 #endif
187 cmp r0, r1
188 blo 1b
189 tst r2, #VM_EXEC
190 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
191 ret lr
193 /*
194 * coherent_kern_range(start, end)
195 *
196 * Ensure coherency between the Icache and the Dcache in the
197 * region described by start, end. If you have non-snooping
198 * Harvard caches, you need to implement this function.
199 *
200 * - start - virtual start address
201 * - end - virtual end address
202 */
203 ENTRY(arm926_coherent_kern_range)
204 /* FALLTHROUGH */
206 /*
207 * coherent_user_range(start, end)
208 *
209 * Ensure coherency between the Icache and the Dcache in the
210 * region described by start, end. If you have non-snooping
211 * Harvard caches, you need to implement this function.
212 *
213 * - start - virtual start address
214 * - end - virtual end address
215 */
216 ENTRY(arm926_coherent_user_range)
217 bic r0, r0, #CACHE_DLINESIZE - 1
218 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
219 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
220 add r0, r0, #CACHE_DLINESIZE
221 cmp r0, r1
222 blo 1b
223 mcr p15, 0, r0, c7, c10, 4 @ drain WB
224 mov r0, #0
225 ret lr
227 /*
228 * flush_kern_dcache_area(void *addr, size_t size)
229 *
230 * Ensure no D cache aliasing occurs, either with itself or
231 * the I cache
232 *
233 * - addr - kernel address
234 * - size - region size
235 */
236 ENTRY(arm926_flush_kern_dcache_area)
237 add r1, r0, r1
238 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
239 add r0, r0, #CACHE_DLINESIZE
240 cmp r0, r1
241 blo 1b
242 mov r0, #0
243 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
244 mcr p15, 0, r0, c7, c10, 4 @ drain WB
245 ret lr
247 /*
248 * dma_inv_range(start, end)
249 *
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
253 * back.
254 *
255 * - start - virtual start address
256 * - end - virtual end address
257 *
258 * (same as v4wb)
259 */
260 arm926_dma_inv_range:
261 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
262 tst r0, #CACHE_DLINESIZE - 1
263 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
264 tst r1, #CACHE_DLINESIZE - 1
265 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
266 #endif
267 bic r0, r0, #CACHE_DLINESIZE - 1
268 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
269 add r0, r0, #CACHE_DLINESIZE
270 cmp r0, r1
271 blo 1b
272 mcr p15, 0, r0, c7, c10, 4 @ drain WB
273 ret lr
275 /*
276 * dma_clean_range(start, end)
277 *
278 * Clean the specified virtual address range.
279 *
280 * - start - virtual start address
281 * - end - virtual end address
282 *
283 * (same as v4wb)
284 */
285 arm926_dma_clean_range:
286 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
287 bic r0, r0, #CACHE_DLINESIZE - 1
288 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
289 add r0, r0, #CACHE_DLINESIZE
290 cmp r0, r1
291 blo 1b
292 #endif
293 mcr p15, 0, r0, c7, c10, 4 @ drain WB
294 ret lr
296 /*
297 * dma_flush_range(start, end)
298 *
299 * Clean and invalidate the specified virtual address range.
300 *
301 * - start - virtual start address
302 * - end - virtual end address
303 */
304 ENTRY(arm926_dma_flush_range)
305 bic r0, r0, #CACHE_DLINESIZE - 1
306 1:
307 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
308 mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
309 #else
310 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
311 #endif
312 add r0, r0, #CACHE_DLINESIZE
313 cmp r0, r1
314 blo 1b
315 mcr p15, 0, r0, c7, c10, 4 @ drain WB
316 ret lr
318 /*
319 * dma_map_area(start, size, dir)
320 * - start - kernel virtual start address
321 * - size - size of region
322 * - dir - DMA direction
323 */
324 ENTRY(arm926_dma_map_area)
325 add r1, r1, r0
326 cmp r2, #DMA_TO_DEVICE
327 beq arm926_dma_clean_range
328 bcs arm926_dma_inv_range
329 b arm926_dma_flush_range
330 ENDPROC(arm926_dma_map_area)
332 /*
333 * dma_unmap_area(start, size, dir)
334 * - start - kernel virtual start address
335 * - size - size of region
336 * - dir - DMA direction
337 */
338 ENTRY(arm926_dma_unmap_area)
339 ret lr
340 ENDPROC(arm926_dma_unmap_area)
342 .globl arm926_flush_kern_cache_louis
343 .equ arm926_flush_kern_cache_louis, arm926_flush_kern_cache_all
345 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
346 define_cache_functions arm926
348 ENTRY(cpu_arm926_dcache_clean_area)
349 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
350 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
351 add r0, r0, #CACHE_DLINESIZE
352 subs r1, r1, #CACHE_DLINESIZE
353 bhi 1b
354 #endif
355 mcr p15, 0, r0, c7, c10, 4 @ drain WB
356 ret lr
358 /* =============================== PageTable ============================== */
360 /*
361 * cpu_arm926_switch_mm(pgd)
362 *
363 * Set the translation base pointer to be as described by pgd.
364 *
365 * pgd: new page tables
366 */
367 .align 5
368 ENTRY(cpu_arm926_switch_mm)
369 #ifdef CONFIG_MMU
370 mov ip, #0
371 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
372 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
373 #else
374 @ && 'Clean & Invalidate whole DCache'
375 1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate
376 bne 1b
377 #endif
378 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
379 mcr p15, 0, ip, c7, c10, 4 @ drain WB
380 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
381 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
382 #endif
383 ret lr
385 /*
386 * cpu_arm926_set_pte_ext(ptep, pte, ext)
387 *
388 * Set a PTE and flush it out
389 */
390 .align 5
391 ENTRY(cpu_arm926_set_pte_ext)
392 #ifdef CONFIG_MMU
393 armv3_set_pte_ext
394 mov r0, r0
395 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
396 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
397 #endif
398 mcr p15, 0, r0, c7, c10, 4 @ drain WB
399 #endif
400 ret lr
402 /* Suspend/resume support: taken from arch/arm/plat-s3c24xx/sleep.S */
403 .globl cpu_arm926_suspend_size
404 .equ cpu_arm926_suspend_size, 4 * 3
405 #ifdef CONFIG_ARM_CPU_SUSPEND
406 ENTRY(cpu_arm926_do_suspend)
407 stmfd sp!, {r4 - r6, lr}
408 mrc p15, 0, r4, c13, c0, 0 @ PID
409 mrc p15, 0, r5, c3, c0, 0 @ Domain ID
410 mrc p15, 0, r6, c1, c0, 0 @ Control register
411 stmia r0, {r4 - r6}
412 ldmfd sp!, {r4 - r6, pc}
413 ENDPROC(cpu_arm926_do_suspend)
415 ENTRY(cpu_arm926_do_resume)
416 mov ip, #0
417 mcr p15, 0, ip, c8, c7, 0 @ invalidate I+D TLBs
418 mcr p15, 0, ip, c7, c7, 0 @ invalidate I+D caches
419 ldmia r0, {r4 - r6}
420 mcr p15, 0, r4, c13, c0, 0 @ PID
421 mcr p15, 0, r5, c3, c0, 0 @ Domain ID
422 mcr p15, 0, r1, c2, c0, 0 @ TTB address
423 mov r0, r6 @ control register
424 b cpu_resume_mmu
425 ENDPROC(cpu_arm926_do_resume)
426 #endif
428 .type __arm926_setup, #function
429 __arm926_setup:
430 mov r0, #0
431 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
432 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
433 #ifdef CONFIG_MMU
434 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
435 #endif
438 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
439 mov r0, #4 @ disable write-back on caches explicitly
440 mcr p15, 7, r0, c15, c0, 0
441 #endif
443 adr r5, arm926_crval
444 ldmia r5, {r5, r6}
445 mrc p15, 0, r0, c1, c0 @ get control register v4
446 bic r0, r0, r5
447 orr r0, r0, r6
448 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
449 orr r0, r0, #0x4000 @ .1.. .... .... ....
450 #endif
451 ret lr
452 .size __arm926_setup, . - __arm926_setup
454 /*
455 * R
456 * .RVI ZFRS BLDP WCAM
457 * .011 0001 ..11 0101
458 *
459 */
460 .type arm926_crval, #object
461 arm926_crval:
462 crval clear=0x00007f3f, mmuset=0x00003135, ucset=0x00001134
464 __INITDATA
466 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
467 define_processor_functions arm926, dabort=v5tj_early_abort, pabort=legacy_pabort, suspend=1
469 .section ".rodata"
471 string cpu_arch_name, "armv5tej"
472 string cpu_elf_name, "v5"
473 string cpu_arm926_name, "ARM926EJ-S"
475 .align
477 .section ".proc.info.init", #alloc, #execinstr
479 .type __arm926_proc_info,#object
480 __arm926_proc_info:
481 .long 0x41069260 @ ARM926EJ-S (v5TEJ)
482 .long 0xff0ffff0
483 .long PMD_TYPE_SECT | \
484 PMD_SECT_BUFFERABLE | \
485 PMD_SECT_CACHEABLE | \
486 PMD_BIT4 | \
487 PMD_SECT_AP_WRITE | \
488 PMD_SECT_AP_READ
489 .long PMD_TYPE_SECT | \
490 PMD_BIT4 | \
491 PMD_SECT_AP_WRITE | \
492 PMD_SECT_AP_READ
493 b __arm926_setup
494 .long cpu_arch_name
495 .long cpu_elf_name
496 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_JAVA
497 .long cpu_arm926_name
498 .long arm926_processor_functions
499 .long v4wbi_tlb_fns
500 .long v4wb_user_fns
501 .long arm926_cache_fns
502 .size __arm926_proc_info, . - __arm926_proc_info