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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"
37
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
47
48/*
49 * the cache line size of the I and D cache
50 */
51#define CACHE_DLINESIZE 32
52
53 .text
54/*
55 * cpu_arm926_proc_init()
56 */
57ENTRY(cpu_arm926_proc_init)
58 mov pc, lr
59
60/*
61 * cpu_arm926_proc_fin()
62 */
63ENTRY(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
69
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"
81ENTRY(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
93ENDPROC(cpu_arm926_reset)
94 .popsection
95
96/*
97 * cpu_arm926_do_idle()
98 *
99 * Called with IRQs disabled
100 */
101 .align 10
102ENTRY(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
115
116/*
117 * flush_icache_all()
118 *
119 * Unconditionally clean and invalidate the entire icache.
120 */
121ENTRY(arm926_flush_icache_all)
122 mov r0, #0
123 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
124 mov pc, lr
125ENDPROC(arm926_flush_icache_all)
126
127/*
128 * flush_user_cache_all()
129 *
130 * Clean and invalidate all cache entries in a particular
131 * address space.
132 */
133ENTRY(arm926_flush_user_cache_all)
134 /* FALLTHROUGH */
135
136/*
137 * flush_kern_cache_all()
138 *
139 * Clean and invalidate the entire cache.
140 */
141ENTRY(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
1481: 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
155
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 */
166ENTRY(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
1711: 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
192
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 */
203ENTRY(arm926_coherent_kern_range)
204 /* FALLTHROUGH */
205
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 */
216ENTRY(arm926_coherent_user_range)
217 bic r0, r0, #CACHE_DLINESIZE - 1
2181: 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 mov pc, lr
226
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 */
236ENTRY(arm926_flush_kern_dcache_area)
237 add r1, r0, r1
2381: 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 mov pc, lr
246
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 */
260arm926_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
2681: 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 mov pc, lr
274
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 */
285arm926_dma_clean_range:
286#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
287 bic r0, r0, #CACHE_DLINESIZE - 1
2881: 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 mov pc, lr
295
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 */
304ENTRY(arm926_dma_flush_range)
305 bic r0, r0, #CACHE_DLINESIZE - 1
3061:
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 mov pc, lr
317
318/*
319 * dma_map_area(start, size, dir)
320 * - start - kernel virtual start address
321 * - size - size of region
322 * - dir - DMA direction
323 */
324ENTRY(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
330ENDPROC(arm926_dma_map_area)
331
332/*
333 * dma_unmap_area(start, size, dir)
334 * - start - kernel virtual start address
335 * - size - size of region
336 * - dir - DMA direction
337 */
338ENTRY(arm926_dma_unmap_area)
339 mov pc, lr
340ENDPROC(arm926_dma_unmap_area)
341
342 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
343 define_cache_functions arm926
344
345ENTRY(cpu_arm926_dcache_clean_area)
346#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
3471: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
348 add r0, r0, #CACHE_DLINESIZE
349 subs r1, r1, #CACHE_DLINESIZE
350 bhi 1b
351#endif
352 mcr p15, 0, r0, c7, c10, 4 @ drain WB
353 mov pc, lr
354
355/* =============================== PageTable ============================== */
356
357/*
358 * cpu_arm926_switch_mm(pgd)
359 *
360 * Set the translation base pointer to be as described by pgd.
361 *
362 * pgd: new page tables
363 */
364 .align 5
365ENTRY(cpu_arm926_switch_mm)
366#ifdef CONFIG_MMU
367 mov ip, #0
368#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
369 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
370#else
371@ && 'Clean & Invalidate whole DCache'
3721: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate
373 bne 1b
374#endif
375 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
376 mcr p15, 0, ip, c7, c10, 4 @ drain WB
377 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
378 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
379#endif
380 mov pc, lr
381
382/*
383 * cpu_arm926_set_pte_ext(ptep, pte, ext)
384 *
385 * Set a PTE and flush it out
386 */
387 .align 5
388ENTRY(cpu_arm926_set_pte_ext)
389#ifdef CONFIG_MMU
390 armv3_set_pte_ext
391 mov r0, r0
392#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
393 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
394#endif
395 mcr p15, 0, r0, c7, c10, 4 @ drain WB
396#endif
397 mov pc, lr
398
399/* Suspend/resume support: taken from arch/arm/plat-s3c24xx/sleep.S */
400.globl cpu_arm926_suspend_size
401.equ cpu_arm926_suspend_size, 4 * 3
402#ifdef CONFIG_PM_SLEEP
403ENTRY(cpu_arm926_do_suspend)
404 stmfd sp!, {r4 - r6, lr}
405 mrc p15, 0, r4, c13, c0, 0 @ PID
406 mrc p15, 0, r5, c3, c0, 0 @ Domain ID
407 mrc p15, 0, r6, c1, c0, 0 @ Control register
408 stmia r0, {r4 - r6}
409 ldmfd sp!, {r4 - r6, pc}
410ENDPROC(cpu_arm926_do_suspend)
411
412ENTRY(cpu_arm926_do_resume)
413 mov ip, #0
414 mcr p15, 0, ip, c8, c7, 0 @ invalidate I+D TLBs
415 mcr p15, 0, ip, c7, c7, 0 @ invalidate I+D caches
416 ldmia r0, {r4 - r6}
417 mcr p15, 0, r4, c13, c0, 0 @ PID
418 mcr p15, 0, r5, c3, c0, 0 @ Domain ID
419 mcr p15, 0, r1, c2, c0, 0 @ TTB address
420 mov r0, r6 @ control register
421 b cpu_resume_mmu
422ENDPROC(cpu_arm926_do_resume)
423#endif
424
425 __CPUINIT
426
427 .type __arm926_setup, #function
428__arm926_setup:
429 mov r0, #0
430 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
431 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
432#ifdef CONFIG_MMU
433 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
434#endif
435
436
437#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
438 mov r0, #4 @ disable write-back on caches explicitly
439 mcr p15, 7, r0, c15, c0, 0
440#endif
441
442 adr r5, arm926_crval
443 ldmia r5, {r5, r6}
444 mrc p15, 0, r0, c1, c0 @ get control register v4
445 bic r0, r0, r5
446 orr r0, r0, r6
447#ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
448 orr r0, r0, #0x4000 @ .1.. .... .... ....
449#endif
450 mov pc, lr
451 .size __arm926_setup, . - __arm926_setup
452
453 /*
454 * R
455 * .RVI ZFRS BLDP WCAM
456 * .011 0001 ..11 0101
457 *
458 */
459 .type arm926_crval, #object
460arm926_crval:
461 crval clear=0x00007f3f, mmuset=0x00003135, ucset=0x00001134
462
463 __INITDATA
464
465 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
466 define_processor_functions arm926, dabort=v5tj_early_abort, pabort=legacy_pabort, suspend=1
467
468 .section ".rodata"
469
470 string cpu_arch_name, "armv5tej"
471 string cpu_elf_name, "v5"
472 string cpu_arm926_name, "ARM926EJ-S"
473
474 .align
475
476 .section ".proc.info.init", #alloc, #execinstr
477
478 .type __arm926_proc_info,#object
479__arm926_proc_info:
480 .long 0x41069260 @ ARM926EJ-S (v5TEJ)
481 .long 0xff0ffff0
482 .long PMD_TYPE_SECT | \
483 PMD_SECT_BUFFERABLE | \
484 PMD_SECT_CACHEABLE | \
485 PMD_BIT4 | \
486 PMD_SECT_AP_WRITE | \
487 PMD_SECT_AP_READ
488 .long PMD_TYPE_SECT | \
489 PMD_BIT4 | \
490 PMD_SECT_AP_WRITE | \
491 PMD_SECT_AP_READ
492 b __arm926_setup
493 .long cpu_arch_name
494 .long cpu_elf_name
495 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_JAVA
496 .long cpu_arm926_name
497 .long arm926_processor_functions
498 .long v4wbi_tlb_fns
499 .long v4wb_user_fns
500 .long arm926_cache_fns
501 .size __arm926_proc_info, . - __arm926_proc_info