| blob | 22bf8dde4f84b331a07e740800785791dfb852f9 |
1 /*
2 * linux/arch/arm/mm/proc-arm920.S: MMU functions for ARM920
3 *
4 * Copyright (C) 1999,2000 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 arm920.
25 *
26 * CONFIG_CPU_ARM920_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 * The size of one data cache line.
40 */
41 #define CACHE_DLINESIZE 32
43 /*
44 * The number of data cache segments.
45 */
46 #define CACHE_DSEGMENTS 8
48 /*
49 * The number of lines in a cache segment.
50 */
51 #define CACHE_DENTRIES 64
53 /*
54 * This is the size at which it becomes more efficient to
55 * clean the whole cache, rather than using the individual
56 * cache line maintenance instructions.
57 */
58 #define CACHE_DLIMIT 65536
61 .text
62 /*
63 * cpu_arm920_proc_init()
64 */
65 ENTRY(cpu_arm920_proc_init)
66 ret lr
68 /*
69 * cpu_arm920_proc_fin()
70 */
71 ENTRY(cpu_arm920_proc_fin)
72 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
73 bic r0, r0, #0x1000 @ ...i............
74 bic r0, r0, #0x000e @ ............wca.
75 mcr p15, 0, r0, c1, c0, 0 @ disable caches
76 ret lr
78 /*
79 * cpu_arm920_reset(loc)
80 *
81 * Perform a soft reset of the system. Put the CPU into the
82 * same state as it would be if it had been reset, and branch
83 * to what would be the reset vector.
84 *
85 * loc: location to jump to for soft reset
86 */
87 .align 5
88 .pushsection .idmap.text, "ax"
89 ENTRY(cpu_arm920_reset)
90 mov ip, #0
91 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
92 mcr p15, 0, ip, c7, c10, 4 @ drain WB
93 #ifdef CONFIG_MMU
94 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
95 #endif
96 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
97 bic ip, ip, #0x000f @ ............wcam
98 bic ip, ip, #0x1100 @ ...i...s........
99 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
100 ret r0
101 ENDPROC(cpu_arm920_reset)
102 .popsection
104 /*
105 * cpu_arm920_do_idle()
106 */
107 .align 5
108 ENTRY(cpu_arm920_do_idle)
109 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
110 ret lr
113 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
115 /*
116 * flush_icache_all()
117 *
118 * Unconditionally clean and invalidate the entire icache.
119 */
120 ENTRY(arm920_flush_icache_all)
121 mov r0, #0
122 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
123 ret lr
124 ENDPROC(arm920_flush_icache_all)
126 /*
127 * flush_user_cache_all()
128 *
129 * Invalidate all cache entries in a particular address
130 * space.
131 */
132 ENTRY(arm920_flush_user_cache_all)
133 /* FALLTHROUGH */
135 /*
136 * flush_kern_cache_all()
137 *
138 * Clean and invalidate the entire cache.
139 */
140 ENTRY(arm920_flush_kern_cache_all)
141 mov r2, #VM_EXEC
142 mov ip, #0
143 __flush_whole_cache:
144 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 8 segments
145 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
146 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
147 subs r3, r3, #1 << 26
148 bcs 2b @ entries 63 to 0
149 subs r1, r1, #1 << 5
150 bcs 1b @ segments 7 to 0
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 * Invalidate a range of cache entries in the specified
160 * address space.
161 *
162 * - start - start address (inclusive)
163 * - end - end address (exclusive)
164 * - flags - vm_flags for address space
165 */
166 ENTRY(arm920_flush_user_cache_range)
167 mov ip, #0
168 sub r3, r1, r0 @ calculate total size
169 cmp r3, #CACHE_DLIMIT
170 bhs __flush_whole_cache
172 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
173 tst r2, #VM_EXEC
174 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
175 add r0, r0, #CACHE_DLINESIZE
176 cmp r0, r1
177 blo 1b
178 tst r2, #VM_EXEC
179 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
180 ret lr
182 /*
183 * coherent_kern_range(start, end)
184 *
185 * Ensure coherency between the Icache and the Dcache in the
186 * region described by start, end. If you have non-snooping
187 * Harvard caches, you need to implement this function.
188 *
189 * - start - virtual start address
190 * - end - virtual end address
191 */
192 ENTRY(arm920_coherent_kern_range)
193 /* FALLTHROUGH */
195 /*
196 * coherent_user_range(start, end)
197 *
198 * Ensure coherency between the Icache and the Dcache in the
199 * region described by start, end. If you have non-snooping
200 * Harvard caches, you need to implement this function.
201 *
202 * - start - virtual start address
203 * - end - virtual end address
204 */
205 ENTRY(arm920_coherent_user_range)
206 bic r0, r0, #CACHE_DLINESIZE - 1
207 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
208 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
209 add r0, r0, #CACHE_DLINESIZE
210 cmp r0, r1
211 blo 1b
212 mcr p15, 0, r0, c7, c10, 4 @ drain WB
213 mov r0, #0
214 ret lr
216 /*
217 * flush_kern_dcache_area(void *addr, size_t size)
218 *
219 * Ensure no D cache aliasing occurs, either with itself or
220 * the I cache
221 *
222 * - addr - kernel address
223 * - size - region size
224 */
225 ENTRY(arm920_flush_kern_dcache_area)
226 add r1, r0, r1
227 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
228 add r0, r0, #CACHE_DLINESIZE
229 cmp r0, r1
230 blo 1b
231 mov r0, #0
232 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
233 mcr p15, 0, r0, c7, c10, 4 @ drain WB
234 ret lr
236 /*
237 * dma_inv_range(start, end)
238 *
239 * Invalidate (discard) the specified virtual address range.
240 * May not write back any entries. If 'start' or 'end'
241 * are not cache line aligned, those lines must be written
242 * back.
243 *
244 * - start - virtual start address
245 * - end - virtual end address
246 *
247 * (same as v4wb)
248 */
249 arm920_dma_inv_range:
250 tst r0, #CACHE_DLINESIZE - 1
251 bic r0, r0, #CACHE_DLINESIZE - 1
252 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
253 tst r1, #CACHE_DLINESIZE - 1
254 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
255 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
256 add r0, r0, #CACHE_DLINESIZE
257 cmp r0, r1
258 blo 1b
259 mcr p15, 0, r0, c7, c10, 4 @ drain WB
260 ret lr
262 /*
263 * dma_clean_range(start, end)
264 *
265 * Clean the specified virtual address range.
266 *
267 * - start - virtual start address
268 * - end - virtual end address
269 *
270 * (same as v4wb)
271 */
272 arm920_dma_clean_range:
273 bic r0, r0, #CACHE_DLINESIZE - 1
274 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
275 add r0, r0, #CACHE_DLINESIZE
276 cmp r0, r1
277 blo 1b
278 mcr p15, 0, r0, c7, c10, 4 @ drain WB
279 ret lr
281 /*
282 * dma_flush_range(start, end)
283 *
284 * Clean and invalidate the specified virtual address range.
285 *
286 * - start - virtual start address
287 * - end - virtual end address
288 */
289 ENTRY(arm920_dma_flush_range)
290 bic r0, r0, #CACHE_DLINESIZE - 1
291 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
292 add r0, r0, #CACHE_DLINESIZE
293 cmp r0, r1
294 blo 1b
295 mcr p15, 0, r0, c7, c10, 4 @ drain WB
296 ret lr
298 /*
299 * dma_map_area(start, size, dir)
300 * - start - kernel virtual start address
301 * - size - size of region
302 * - dir - DMA direction
303 */
304 ENTRY(arm920_dma_map_area)
305 add r1, r1, r0
306 cmp r2, #DMA_TO_DEVICE
307 beq arm920_dma_clean_range
308 bcs arm920_dma_inv_range
309 b arm920_dma_flush_range
310 ENDPROC(arm920_dma_map_area)
312 /*
313 * dma_unmap_area(start, size, dir)
314 * - start - kernel virtual start address
315 * - size - size of region
316 * - dir - DMA direction
317 */
318 ENTRY(arm920_dma_unmap_area)
319 ret lr
320 ENDPROC(arm920_dma_unmap_area)
322 .globl arm920_flush_kern_cache_louis
323 .equ arm920_flush_kern_cache_louis, arm920_flush_kern_cache_all
325 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
326 define_cache_functions arm920
327 #endif
330 ENTRY(cpu_arm920_dcache_clean_area)
331 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
332 add r0, r0, #CACHE_DLINESIZE
333 subs r1, r1, #CACHE_DLINESIZE
334 bhi 1b
335 ret lr
337 /* =============================== PageTable ============================== */
339 /*
340 * cpu_arm920_switch_mm(pgd)
341 *
342 * Set the translation base pointer to be as described by pgd.
343 *
344 * pgd: new page tables
345 */
346 .align 5
347 ENTRY(cpu_arm920_switch_mm)
348 #ifdef CONFIG_MMU
349 mov ip, #0
350 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
351 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
352 #else
353 @ && 'Clean & Invalidate whole DCache'
354 @ && Re-written to use Index Ops.
355 @ && Uses registers r1, r3 and ip
357 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 8 segments
358 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
359 2: mcr p15, 0, r3, c7, c14, 2 @ clean & invalidate D index
360 subs r3, r3, #1 << 26
361 bcs 2b @ entries 63 to 0
362 subs r1, r1, #1 << 5
363 bcs 1b @ segments 7 to 0
364 #endif
365 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
366 mcr p15, 0, ip, c7, c10, 4 @ drain WB
367 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
368 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
369 #endif
370 ret lr
372 /*
373 * cpu_arm920_set_pte(ptep, pte, ext)
374 *
375 * Set a PTE and flush it out
376 */
377 .align 5
378 ENTRY(cpu_arm920_set_pte_ext)
379 #ifdef CONFIG_MMU
380 armv3_set_pte_ext
381 mov r0, r0
382 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
383 mcr p15, 0, r0, c7, c10, 4 @ drain WB
384 #endif
385 ret lr
387 /* Suspend/resume support: taken from arch/arm/plat-s3c24xx/sleep.S */
388 .globl cpu_arm920_suspend_size
389 .equ cpu_arm920_suspend_size, 4 * 3
390 #ifdef CONFIG_ARM_CPU_SUSPEND
391 ENTRY(cpu_arm920_do_suspend)
392 stmfd sp!, {r4 - r6, lr}
393 mrc p15, 0, r4, c13, c0, 0 @ PID
394 mrc p15, 0, r5, c3, c0, 0 @ Domain ID
395 mrc p15, 0, r6, c1, c0, 0 @ Control register
396 stmia r0, {r4 - r6}
397 ldmfd sp!, {r4 - r6, pc}
398 ENDPROC(cpu_arm920_do_suspend)
400 ENTRY(cpu_arm920_do_resume)
401 mov ip, #0
402 mcr p15, 0, ip, c8, c7, 0 @ invalidate I+D TLBs
403 mcr p15, 0, ip, c7, c7, 0 @ invalidate I+D caches
404 ldmia r0, {r4 - r6}
405 mcr p15, 0, r4, c13, c0, 0 @ PID
406 mcr p15, 0, r5, c3, c0, 0 @ Domain ID
407 mcr p15, 0, r1, c2, c0, 0 @ TTB address
408 mov r0, r6 @ control register
409 b cpu_resume_mmu
410 ENDPROC(cpu_arm920_do_resume)
411 #endif
413 .type __arm920_setup, #function
414 __arm920_setup:
415 mov r0, #0
416 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
417 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
418 #ifdef CONFIG_MMU
419 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
420 #endif
421 adr r5, arm920_crval
422 ldmia r5, {r5, r6}
423 mrc p15, 0, r0, c1, c0 @ get control register v4
424 bic r0, r0, r5
425 orr r0, r0, r6
426 ret lr
427 .size __arm920_setup, . - __arm920_setup
429 /*
430 * R
431 * .RVI ZFRS BLDP WCAM
432 * ..11 0001 ..11 0101
433 *
434 */
435 .type arm920_crval, #object
436 arm920_crval:
437 crval clear=0x00003f3f, mmuset=0x00003135, ucset=0x00001130
439 __INITDATA
440 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
441 define_processor_functions arm920, dabort=v4t_early_abort, pabort=legacy_pabort, suspend=1
443 .section ".rodata"
445 string cpu_arch_name, "armv4t"
446 string cpu_elf_name, "v4"
447 string cpu_arm920_name, "ARM920T"
449 .align
451 .section ".proc.info.init", #alloc, #execinstr
453 .type __arm920_proc_info,#object
454 __arm920_proc_info:
455 .long 0x41009200
456 .long 0xff00fff0
457 .long PMD_TYPE_SECT | \
458 PMD_SECT_BUFFERABLE | \
459 PMD_SECT_CACHEABLE | \
460 PMD_BIT4 | \
461 PMD_SECT_AP_WRITE | \
462 PMD_SECT_AP_READ
463 .long PMD_TYPE_SECT | \
464 PMD_BIT4 | \
465 PMD_SECT_AP_WRITE | \
466 PMD_SECT_AP_READ
467 b __arm920_setup
468 .long cpu_arch_name
469 .long cpu_elf_name
470 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
471 .long cpu_arm920_name
472 .long arm920_processor_functions
473 .long v4wbi_tlb_fns
474 .long v4wb_user_fns
475 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
476 .long arm920_cache_fns
477 #else
478 .long v4wt_cache_fns
479 #endif
480 .size __arm920_proc_info, . - __arm920_proc_info