| blob | ee29dc46537126c39c00360d673df5cb4b98a2fe |
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 mov pc, 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 mov pc, 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 mov pc, 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 mov pc, 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 mov pc, 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 mov pc, 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 mov pc, 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 pc, lr
226 /*
227 * flush_kern_dcache_area(void *addr, size_t size)
228 *
229 * Ensure no D cache aliasing occurs, either with itself or
230 * the I cache
231 *
232 * - addr - kernel address
233 * - size - region size
234 */
235 ENTRY(arm926_flush_kern_dcache_area)
236 add r1, r0, r1
237 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
238 add r0, r0, #CACHE_DLINESIZE
239 cmp r0, r1
240 blo 1b
241 mov r0, #0
242 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
243 mcr p15, 0, r0, c7, c10, 4 @ drain WB
244 mov pc, lr
246 /*
247 * dma_inv_range(start, end)
248 *
249 * Invalidate (discard) the specified virtual address range.
250 * May not write back any entries. If 'start' or 'end'
251 * are not cache line aligned, those lines must be written
252 * back.
253 *
254 * - start - virtual start address
255 * - end - virtual end address
256 *
257 * (same as v4wb)
258 */
259 arm926_dma_inv_range:
260 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
261 tst r0, #CACHE_DLINESIZE - 1
262 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
263 tst r1, #CACHE_DLINESIZE - 1
264 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
265 #endif
266 bic r0, r0, #CACHE_DLINESIZE - 1
267 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
268 add r0, r0, #CACHE_DLINESIZE
269 cmp r0, r1
270 blo 1b
271 mcr p15, 0, r0, c7, c10, 4 @ drain WB
272 mov pc, lr
274 /*
275 * dma_clean_range(start, end)
276 *
277 * Clean the specified virtual address range.
278 *
279 * - start - virtual start address
280 * - end - virtual end address
281 *
282 * (same as v4wb)
283 */
284 arm926_dma_clean_range:
285 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
286 bic r0, r0, #CACHE_DLINESIZE - 1
287 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
288 add r0, r0, #CACHE_DLINESIZE
289 cmp r0, r1
290 blo 1b
291 #endif
292 mcr p15, 0, r0, c7, c10, 4 @ drain WB
293 mov pc, lr
295 /*
296 * dma_flush_range(start, end)
297 *
298 * Clean and invalidate the specified virtual address range.
299 *
300 * - start - virtual start address
301 * - end - virtual end address
302 */
303 ENTRY(arm926_dma_flush_range)
304 bic r0, r0, #CACHE_DLINESIZE - 1
305 1:
306 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
307 mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
308 #else
309 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
310 #endif
311 add r0, r0, #CACHE_DLINESIZE
312 cmp r0, r1
313 blo 1b
314 mcr p15, 0, r0, c7, c10, 4 @ drain WB
315 mov pc, lr
317 /*
318 * dma_map_area(start, size, dir)
319 * - start - kernel virtual start address
320 * - size - size of region
321 * - dir - DMA direction
322 */
323 ENTRY(arm926_dma_map_area)
324 add r1, r1, r0
325 cmp r2, #DMA_TO_DEVICE
326 beq arm926_dma_clean_range
327 bcs arm926_dma_inv_range
328 b arm926_dma_flush_range
329 ENDPROC(arm926_dma_map_area)
331 /*
332 * dma_unmap_area(start, size, dir)
333 * - start - kernel virtual start address
334 * - size - size of region
335 * - dir - DMA direction
336 */
337 ENTRY(arm926_dma_unmap_area)
338 mov pc, lr
339 ENDPROC(arm926_dma_unmap_area)
341 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
342 define_cache_functions arm926
344 ENTRY(cpu_arm926_dcache_clean_area)
345 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
346 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
347 add r0, r0, #CACHE_DLINESIZE
348 subs r1, r1, #CACHE_DLINESIZE
349 bhi 1b
350 #endif
351 mcr p15, 0, r0, c7, c10, 4 @ drain WB
352 mov pc, lr
354 /* =============================== PageTable ============================== */
356 /*
357 * cpu_arm926_switch_mm(pgd)
358 *
359 * Set the translation base pointer to be as described by pgd.
360 *
361 * pgd: new page tables
362 */
363 .align 5
364 ENTRY(cpu_arm926_switch_mm)
365 #ifdef CONFIG_MMU
366 mov ip, #0
367 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
368 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
369 #else
370 @ && 'Clean & Invalidate whole DCache'
371 1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate
372 bne 1b
373 #endif
374 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
375 mcr p15, 0, ip, c7, c10, 4 @ drain WB
376 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
377 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
378 #endif
379 mov pc, lr
381 /*
382 * cpu_arm926_set_pte_ext(ptep, pte, ext)
383 *
384 * Set a PTE and flush it out
385 */
386 .align 5
387 ENTRY(cpu_arm926_set_pte_ext)
388 #ifdef CONFIG_MMU
389 armv3_set_pte_ext
390 mov r0, r0
391 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
392 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
393 #endif
394 mcr p15, 0, r0, c7, c10, 4 @ drain WB
395 #endif
396 mov pc, lr
398 /* Suspend/resume support: taken from arch/arm/plat-s3c24xx/sleep.S */
399 .globl cpu_arm926_suspend_size
400 .equ cpu_arm926_suspend_size, 4 * 3
401 #ifdef CONFIG_ARM_CPU_SUSPEND
402 ENTRY(cpu_arm926_do_suspend)
403 stmfd sp!, {r4 - r6, lr}
404 mrc p15, 0, r4, c13, c0, 0 @ PID
405 mrc p15, 0, r5, c3, c0, 0 @ Domain ID
406 mrc p15, 0, r6, c1, c0, 0 @ Control register
407 stmia r0, {r4 - r6}
408 ldmfd sp!, {r4 - r6, pc}
409 ENDPROC(cpu_arm926_do_suspend)
411 ENTRY(cpu_arm926_do_resume)
412 mov ip, #0
413 mcr p15, 0, ip, c8, c7, 0 @ invalidate I+D TLBs
414 mcr p15, 0, ip, c7, c7, 0 @ invalidate I+D caches
415 ldmia r0, {r4 - r6}
416 mcr p15, 0, r4, c13, c0, 0 @ PID
417 mcr p15, 0, r5, c3, c0, 0 @ Domain ID
418 mcr p15, 0, r1, c2, c0, 0 @ TTB address
419 mov r0, r6 @ control register
420 b cpu_resume_mmu
421 ENDPROC(cpu_arm926_do_resume)
422 #endif
424 __CPUINIT
426 .type __arm926_setup, #function
427 __arm926_setup:
428 mov r0, #0
429 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
430 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
431 #ifdef CONFIG_MMU
432 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
433 #endif
436 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
437 mov r0, #4 @ disable write-back on caches explicitly
438 mcr p15, 7, r0, c15, c0, 0
439 #endif
441 adr r5, arm926_crval
442 ldmia r5, {r5, r6}
443 mrc p15, 0, r0, c1, c0 @ get control register v4
444 bic r0, r0, r5
445 orr r0, r0, r6
446 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
447 orr r0, r0, #0x4000 @ .1.. .... .... ....
448 #endif
449 mov pc, lr
450 .size __arm926_setup, . - __arm926_setup
452 /*
453 * R
454 * .RVI ZFRS BLDP WCAM
455 * .011 0001 ..11 0101
456 *
457 */
458 .type arm926_crval, #object
459 arm926_crval:
460 crval clear=0x00007f3f, mmuset=0x00003135, ucset=0x00001134
462 __INITDATA
464 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
465 define_processor_functions arm926, dabort=v5tj_early_abort, pabort=legacy_pabort, suspend=1
467 .section ".rodata"
469 string cpu_arch_name, "armv5tej"
470 string cpu_elf_name, "v5"
471 string cpu_arm926_name, "ARM926EJ-S"
473 .align
475 .section ".proc.info.init", #alloc, #execinstr
477 .type __arm926_proc_info,#object
478 __arm926_proc_info:
479 .long 0x41069260 @ ARM926EJ-S (v5TEJ)
480 .long 0xff0ffff0
481 .long PMD_TYPE_SECT | \
482 PMD_SECT_BUFFERABLE | \
483 PMD_SECT_CACHEABLE | \
484 PMD_BIT4 | \
485 PMD_SECT_AP_WRITE | \
486 PMD_SECT_AP_READ
487 .long PMD_TYPE_SECT | \
488 PMD_BIT4 | \
489 PMD_SECT_AP_WRITE | \
490 PMD_SECT_AP_READ
491 b __arm926_setup
492 .long cpu_arch_name
493 .long cpu_elf_name
494 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_JAVA
495 .long cpu_arm926_name
496 .long arm926_processor_functions
497 .long v4wbi_tlb_fns
498 .long v4wb_user_fns
499 .long arm926_cache_fns
500 .size __arm926_proc_info, . - __arm926_proc_info