| blob | edccfcdcd551fe9e9970172d0467d5ddd3324bba |
1 /*
2 * linux/arch/arm/mm/proc-arm922.S: MMU functions for ARM922
3 *
4 * Copyright (C) 1999,2000 ARM Limited
5 * Copyright (C) 2000 Deep Blue Solutions Ltd.
6 * Copyright (C) 2001 Altera Corporation
7 * hacked for non-paged-MM by Hyok S. Choi, 2003.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 *
23 *
24 * These are the low level assembler for performing cache and TLB
25 * functions on the arm922.
26 *
27 * CONFIG_CPU_ARM922_CPU_IDLE -> nohlt
28 */
29 #include <linux/linkage.h>
30 #include <linux/init.h>
31 #include <asm/assembler.h>
32 #include <asm/hwcap.h>
33 #include <asm/pgtable-hwdef.h>
34 #include <asm/pgtable.h>
35 #include <asm/page.h>
36 #include <asm/ptrace.h>
37 #include "proc-macros.S"
39 /*
40 * The size of one data cache line.
41 */
42 #define CACHE_DLINESIZE 32
44 /*
45 * The number of data cache segments.
46 */
47 #define CACHE_DSEGMENTS 4
49 /*
50 * The number of lines in a cache segment.
51 */
52 #define CACHE_DENTRIES 64
54 /*
55 * This is the size at which it becomes more efficient to
56 * clean the whole cache, rather than using the individual
57 * cache line maintenance instructions. (I think this should
58 * be 32768).
59 */
60 #define CACHE_DLIMIT 8192
63 .text
64 /*
65 * cpu_arm922_proc_init()
66 */
67 ENTRY(cpu_arm922_proc_init)
68 ret lr
70 /*
71 * cpu_arm922_proc_fin()
72 */
73 ENTRY(cpu_arm922_proc_fin)
74 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
75 bic r0, r0, #0x1000 @ ...i............
76 bic r0, r0, #0x000e @ ............wca.
77 mcr p15, 0, r0, c1, c0, 0 @ disable caches
78 ret lr
80 /*
81 * cpu_arm922_reset(loc)
82 *
83 * Perform a soft reset of the system. Put the CPU into the
84 * same state as it would be if it had been reset, and branch
85 * to what would be the reset vector.
86 *
87 * loc: location to jump to for soft reset
88 */
89 .align 5
90 .pushsection .idmap.text, "ax"
91 ENTRY(cpu_arm922_reset)
92 mov ip, #0
93 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
94 mcr p15, 0, ip, c7, c10, 4 @ drain WB
95 #ifdef CONFIG_MMU
96 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
97 #endif
98 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
99 bic ip, ip, #0x000f @ ............wcam
100 bic ip, ip, #0x1100 @ ...i...s........
101 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
102 ret r0
103 ENDPROC(cpu_arm922_reset)
104 .popsection
106 /*
107 * cpu_arm922_do_idle()
108 */
109 .align 5
110 ENTRY(cpu_arm922_do_idle)
111 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
112 ret lr
115 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
117 /*
118 * flush_icache_all()
119 *
120 * Unconditionally clean and invalidate the entire icache.
121 */
122 ENTRY(arm922_flush_icache_all)
123 mov r0, #0
124 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
125 ret lr
126 ENDPROC(arm922_flush_icache_all)
128 /*
129 * flush_user_cache_all()
130 *
131 * Clean and invalidate all cache entries in a particular
132 * address space.
133 */
134 ENTRY(arm922_flush_user_cache_all)
135 /* FALLTHROUGH */
137 /*
138 * flush_kern_cache_all()
139 *
140 * Clean and invalidate the entire cache.
141 */
142 ENTRY(arm922_flush_kern_cache_all)
143 mov r2, #VM_EXEC
144 mov ip, #0
145 __flush_whole_cache:
146 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 8 segments
147 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
148 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
149 subs r3, r3, #1 << 26
150 bcs 2b @ entries 63 to 0
151 subs r1, r1, #1 << 5
152 bcs 1b @ segments 7 to 0
153 tst r2, #VM_EXEC
154 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
155 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
156 ret lr
158 /*
159 * flush_user_cache_range(start, end, flags)
160 *
161 * Clean and invalidate a range of cache entries in the
162 * specified address range.
163 *
164 * - start - start address (inclusive)
165 * - end - end address (exclusive)
166 * - flags - vm_flags describing address space
167 */
168 ENTRY(arm922_flush_user_cache_range)
169 mov ip, #0
170 sub r3, r1, r0 @ calculate total size
171 cmp r3, #CACHE_DLIMIT
172 bhs __flush_whole_cache
174 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
175 tst r2, #VM_EXEC
176 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
177 add r0, r0, #CACHE_DLINESIZE
178 cmp r0, r1
179 blo 1b
180 tst r2, #VM_EXEC
181 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
182 ret lr
184 /*
185 * coherent_kern_range(start, end)
186 *
187 * Ensure coherency between the Icache and the Dcache in the
188 * region described by start, end. If you have non-snooping
189 * Harvard caches, you need to implement this function.
190 *
191 * - start - virtual start address
192 * - end - virtual end address
193 */
194 ENTRY(arm922_coherent_kern_range)
195 /* FALLTHROUGH */
197 /*
198 * coherent_user_range(start, end)
199 *
200 * Ensure coherency between the Icache and the Dcache in the
201 * region described by start, end. If you have non-snooping
202 * Harvard caches, you need to implement this function.
203 *
204 * - start - virtual start address
205 * - end - virtual end address
206 */
207 ENTRY(arm922_coherent_user_range)
208 bic r0, r0, #CACHE_DLINESIZE - 1
209 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
210 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
211 add r0, r0, #CACHE_DLINESIZE
212 cmp r0, r1
213 blo 1b
214 mcr p15, 0, r0, c7, c10, 4 @ drain WB
215 mov r0, #0
216 ret lr
218 /*
219 * flush_kern_dcache_area(void *addr, size_t size)
220 *
221 * Ensure no D cache aliasing occurs, either with itself or
222 * the I cache
223 *
224 * - addr - kernel address
225 * - size - region size
226 */
227 ENTRY(arm922_flush_kern_dcache_area)
228 add r1, r0, r1
229 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
230 add r0, r0, #CACHE_DLINESIZE
231 cmp r0, r1
232 blo 1b
233 mov r0, #0
234 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
235 mcr p15, 0, r0, c7, c10, 4 @ drain WB
236 ret lr
238 /*
239 * dma_inv_range(start, end)
240 *
241 * Invalidate (discard) the specified virtual address range.
242 * May not write back any entries. If 'start' or 'end'
243 * are not cache line aligned, those lines must be written
244 * back.
245 *
246 * - start - virtual start address
247 * - end - virtual end address
248 *
249 * (same as v4wb)
250 */
251 arm922_dma_inv_range:
252 tst r0, #CACHE_DLINESIZE - 1
253 bic r0, r0, #CACHE_DLINESIZE - 1
254 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
255 tst r1, #CACHE_DLINESIZE - 1
256 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
257 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
258 add r0, r0, #CACHE_DLINESIZE
259 cmp r0, r1
260 blo 1b
261 mcr p15, 0, r0, c7, c10, 4 @ drain WB
262 ret lr
264 /*
265 * dma_clean_range(start, end)
266 *
267 * Clean the specified virtual address range.
268 *
269 * - start - virtual start address
270 * - end - virtual end address
271 *
272 * (same as v4wb)
273 */
274 arm922_dma_clean_range:
275 bic r0, r0, #CACHE_DLINESIZE - 1
276 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
277 add r0, r0, #CACHE_DLINESIZE
278 cmp r0, r1
279 blo 1b
280 mcr p15, 0, r0, c7, c10, 4 @ drain WB
281 ret lr
283 /*
284 * dma_flush_range(start, end)
285 *
286 * Clean and invalidate the specified virtual address range.
287 *
288 * - start - virtual start address
289 * - end - virtual end address
290 */
291 ENTRY(arm922_dma_flush_range)
292 bic r0, r0, #CACHE_DLINESIZE - 1
293 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
294 add r0, r0, #CACHE_DLINESIZE
295 cmp r0, r1
296 blo 1b
297 mcr p15, 0, r0, c7, c10, 4 @ drain WB
298 ret lr
300 /*
301 * dma_map_area(start, size, dir)
302 * - start - kernel virtual start address
303 * - size - size of region
304 * - dir - DMA direction
305 */
306 ENTRY(arm922_dma_map_area)
307 add r1, r1, r0
308 cmp r2, #DMA_TO_DEVICE
309 beq arm922_dma_clean_range
310 bcs arm922_dma_inv_range
311 b arm922_dma_flush_range
312 ENDPROC(arm922_dma_map_area)
314 /*
315 * dma_unmap_area(start, size, dir)
316 * - start - kernel virtual start address
317 * - size - size of region
318 * - dir - DMA direction
319 */
320 ENTRY(arm922_dma_unmap_area)
321 ret lr
322 ENDPROC(arm922_dma_unmap_area)
324 .globl arm922_flush_kern_cache_louis
325 .equ arm922_flush_kern_cache_louis, arm922_flush_kern_cache_all
327 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
328 define_cache_functions arm922
329 #endif
332 ENTRY(cpu_arm922_dcache_clean_area)
333 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
334 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
335 add r0, r0, #CACHE_DLINESIZE
336 subs r1, r1, #CACHE_DLINESIZE
337 bhi 1b
338 #endif
339 ret lr
341 /* =============================== PageTable ============================== */
343 /*
344 * cpu_arm922_switch_mm(pgd)
345 *
346 * Set the translation base pointer to be as described by pgd.
347 *
348 * pgd: new page tables
349 */
350 .align 5
351 ENTRY(cpu_arm922_switch_mm)
352 #ifdef CONFIG_MMU
353 mov ip, #0
354 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
355 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
356 #else
357 @ && 'Clean & Invalidate whole DCache'
358 @ && Re-written to use Index Ops.
359 @ && Uses registers r1, r3 and ip
361 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 4 segments
362 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
363 2: mcr p15, 0, r3, c7, c14, 2 @ clean & invalidate D index
364 subs r3, r3, #1 << 26
365 bcs 2b @ entries 63 to 0
366 subs r1, r1, #1 << 5
367 bcs 1b @ segments 7 to 0
368 #endif
369 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
370 mcr p15, 0, ip, c7, c10, 4 @ drain WB
371 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
372 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
373 #endif
374 ret lr
376 /*
377 * cpu_arm922_set_pte_ext(ptep, pte, ext)
378 *
379 * Set a PTE and flush it out
380 */
381 .align 5
382 ENTRY(cpu_arm922_set_pte_ext)
383 #ifdef CONFIG_MMU
384 armv3_set_pte_ext
385 mov r0, r0
386 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
387 mcr p15, 0, r0, c7, c10, 4 @ drain WB
388 #endif /* CONFIG_MMU */
389 ret lr
391 .type __arm922_setup, #function
392 __arm922_setup:
393 mov r0, #0
394 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
395 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
396 #ifdef CONFIG_MMU
397 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
398 #endif
399 adr r5, arm922_crval
400 ldmia r5, {r5, r6}
401 mrc p15, 0, r0, c1, c0 @ get control register v4
402 bic r0, r0, r5
403 orr r0, r0, r6
404 ret lr
405 .size __arm922_setup, . - __arm922_setup
407 /*
408 * R
409 * .RVI ZFRS BLDP WCAM
410 * ..11 0001 ..11 0101
411 *
412 */
413 .type arm922_crval, #object
414 arm922_crval:
415 crval clear=0x00003f3f, mmuset=0x00003135, ucset=0x00001130
417 __INITDATA
418 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
419 define_processor_functions arm922, dabort=v4t_early_abort, pabort=legacy_pabort
421 .section ".rodata"
423 string cpu_arch_name, "armv4t"
424 string cpu_elf_name, "v4"
425 string cpu_arm922_name, "ARM922T"
427 .align
429 .section ".proc.info.init", #alloc
431 .type __arm922_proc_info,#object
432 __arm922_proc_info:
433 .long 0x41009220
434 .long 0xff00fff0
435 .long PMD_TYPE_SECT | \
436 PMD_SECT_BUFFERABLE | \
437 PMD_SECT_CACHEABLE | \
438 PMD_BIT4 | \
439 PMD_SECT_AP_WRITE | \
440 PMD_SECT_AP_READ
441 .long PMD_TYPE_SECT | \
442 PMD_BIT4 | \
443 PMD_SECT_AP_WRITE | \
444 PMD_SECT_AP_READ
445 initfn __arm922_setup, __arm922_proc_info
446 .long cpu_arch_name
447 .long cpu_elf_name
448 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
449 .long cpu_arm922_name
450 .long arm922_processor_functions
451 .long v4wbi_tlb_fns
452 .long v4wb_user_fns
453 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
454 .long arm922_cache_fns
455 #else
456 .long v4wt_cache_fns
457 #endif
458 .size __arm922_proc_info, . - __arm922_proc_info