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1/*
2 * linux/arch/arm/mm/proc-xscale.S
3 *
4 * Author: Nicolas Pitre
5 * Created: November 2000
6 * Copyright: (C) 2000, 2001 MontaVista Software Inc.
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 version 2 as
10 * published by the Free Software Foundation.
11 *
12 * MMU functions for the Intel XScale CPUs
13 *
14 * 2001 Aug 21:
15 * some contributions by Brett Gaines <brett.w.gaines@intel.com>
16 * Copyright 2001 by Intel Corp.
17 *
18 * 2001 Sep 08:
19 * Completely revisited, many important fixes
20 * Nicolas Pitre <nico@fluxnic.net>
21 */
22
23#include <linux/linkage.h>
24#include <linux/init.h>
25#include <asm/assembler.h>
26#include <asm/hwcap.h>
27#include <asm/pgtable.h>
28#include <asm/pgtable-hwdef.h>
29#include <asm/page.h>
30#include <asm/ptrace.h>
31#include "proc-macros.S"
32
33/*
34 * This is the maximum size of an area which will be flushed. If the area
35 * is larger than this, then we flush the whole cache
36 */
37#define MAX_AREA_SIZE 32768
38
39/*
40 * the cache line size of the I and D cache
41 */
42#define CACHELINESIZE 32
43
44/*
45 * the size of the data cache
46 */
47#define CACHESIZE 32768
48
49/*
50 * Virtual address used to allocate the cache when flushed
51 *
52 * This must be an address range which is _never_ used. It should
53 * apparently have a mapping in the corresponding page table for
54 * compatibility with future CPUs that _could_ require it. For instance we
55 * don't care.
56 *
57 * This must be aligned on a 2*CACHESIZE boundary. The code selects one of
58 * the 2 areas in alternance each time the clean_d_cache macro is used.
59 * Without this the XScale core exhibits cache eviction problems and no one
60 * knows why.
61 *
62 * Reminder: the vector table is located at 0xffff0000-0xffff0fff.
63 */
64#define CLEAN_ADDR 0xfffe0000
65
66/*
67 * This macro is used to wait for a CP15 write and is needed
68 * when we have to ensure that the last operation to the co-pro
69 * was completed before continuing with operation.
70 */
71 .macro cpwait, rd
72 mrc p15, 0, \rd, c2, c0, 0 @ arbitrary read of cp15
73 mov \rd, \rd @ wait for completion
74 sub pc, pc, #4 @ flush instruction pipeline
75 .endm
76
77 .macro cpwait_ret, lr, rd
78 mrc p15, 0, \rd, c2, c0, 0 @ arbitrary read of cp15
79 sub pc, \lr, \rd, LSR #32 @ wait for completion and
80 @ flush instruction pipeline
81 .endm
82
83/*
84 * This macro cleans the entire dcache using line allocate.
85 * The main loop has been unrolled to reduce loop overhead.
86 * rd and rs are two scratch registers.
87 */
88 .macro clean_d_cache, rd, rs
89 ldr \rs, =clean_addr
90 ldr \rd, [\rs]
91 eor \rd, \rd, #CACHESIZE
92 str \rd, [\rs]
93 add \rs, \rd, #CACHESIZE
941: mcr p15, 0, \rd, c7, c2, 5 @ allocate D cache line
95 add \rd, \rd, #CACHELINESIZE
96 mcr p15, 0, \rd, c7, c2, 5 @ allocate D cache line
97 add \rd, \rd, #CACHELINESIZE
98 mcr p15, 0, \rd, c7, c2, 5 @ allocate D cache line
99 add \rd, \rd, #CACHELINESIZE
100 mcr p15, 0, \rd, c7, c2, 5 @ allocate D cache line
101 add \rd, \rd, #CACHELINESIZE
102 teq \rd, \rs
103 bne 1b
104 .endm
105
106 .data
107clean_addr: .word CLEAN_ADDR
108
109 .text
110
111/*
112 * cpu_xscale_proc_init()
113 *
114 * Nothing too exciting at the moment
115 */
116ENTRY(cpu_xscale_proc_init)
117 @ enable write buffer coalescing. Some bootloader disable it
118 mrc p15, 0, r1, c1, c0, 1
119 bic r1, r1, #1
120 mcr p15, 0, r1, c1, c0, 1
121 mov pc, lr
122
123/*
124 * cpu_xscale_proc_fin()
125 */
126ENTRY(cpu_xscale_proc_fin)
127 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
128 bic r0, r0, #0x1800 @ ...IZ...........
129 bic r0, r0, #0x0006 @ .............CA.
130 mcr p15, 0, r0, c1, c0, 0 @ disable caches
131 mov pc, lr
132
133/*
134 * cpu_xscale_reset(loc)
135 *
136 * Perform a soft reset of the system. Put the CPU into the
137 * same state as it would be if it had been reset, and branch
138 * to what would be the reset vector.
139 *
140 * loc: location to jump to for soft reset
141 *
142 * Beware PXA270 erratum E7.
143 */
144 .align 5
145ENTRY(cpu_xscale_reset)
146 mov r1, #PSR_F_BIT|PSR_I_BIT|SVC_MODE
147 msr cpsr_c, r1 @ reset CPSR
148 mcr p15, 0, r1, c10, c4, 1 @ unlock I-TLB
149 mcr p15, 0, r1, c8, c5, 0 @ invalidate I-TLB
150 mrc p15, 0, r1, c1, c0, 0 @ ctrl register
151 bic r1, r1, #0x0086 @ ........B....CA.
152 bic r1, r1, #0x3900 @ ..VIZ..S........
153 sub pc, pc, #4 @ flush pipeline
154 @ *** cache line aligned ***
155 mcr p15, 0, r1, c1, c0, 0 @ ctrl register
156 bic r1, r1, #0x0001 @ ...............M
157 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches & BTB
158 mcr p15, 0, r1, c1, c0, 0 @ ctrl register
159 @ CAUTION: MMU turned off from this point. We count on the pipeline
160 @ already containing those two last instructions to survive.
161 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
162 mov pc, r0
163
164/*
165 * cpu_xscale_do_idle()
166 *
167 * Cause the processor to idle
168 *
169 * For now we do nothing but go to idle mode for every case
170 *
171 * XScale supports clock switching, but using idle mode support
172 * allows external hardware to react to system state changes.
173 */
174 .align 5
175
176ENTRY(cpu_xscale_do_idle)
177 mov r0, #1
178 mcr p14, 0, r0, c7, c0, 0 @ Go to IDLE
179 mov pc, lr
180
181/* ================================= CACHE ================================ */
182
183/*
184 * flush_icache_all()
185 *
186 * Unconditionally clean and invalidate the entire icache.
187 */
188ENTRY(xscale_flush_icache_all)
189 mov r0, #0
190 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
191 mov pc, lr
192ENDPROC(xscale_flush_icache_all)
193
194/*
195 * flush_user_cache_all()
196 *
197 * Invalidate all cache entries in a particular address
198 * space.
199 */
200ENTRY(xscale_flush_user_cache_all)
201 /* FALLTHROUGH */
202
203/*
204 * flush_kern_cache_all()
205 *
206 * Clean and invalidate the entire cache.
207 */
208ENTRY(xscale_flush_kern_cache_all)
209 mov r2, #VM_EXEC
210 mov ip, #0
211__flush_whole_cache:
212 clean_d_cache r0, r1
213 tst r2, #VM_EXEC
214 mcrne p15, 0, ip, c7, c5, 0 @ Invalidate I cache & BTB
215 mcrne p15, 0, ip, c7, c10, 4 @ Drain Write (& Fill) Buffer
216 mov pc, lr
217
218/*
219 * flush_user_cache_range(start, end, vm_flags)
220 *
221 * Invalidate a range of cache entries in the specified
222 * address space.
223 *
224 * - start - start address (may not be aligned)
225 * - end - end address (exclusive, may not be aligned)
226 * - vma - vma_area_struct describing address space
227 */
228 .align 5
229ENTRY(xscale_flush_user_cache_range)
230 mov ip, #0
231 sub r3, r1, r0 @ calculate total size
232 cmp r3, #MAX_AREA_SIZE
233 bhs __flush_whole_cache
234
2351: tst r2, #VM_EXEC
236 mcrne p15, 0, r0, c7, c5, 1 @ Invalidate I cache line
237 mcr p15, 0, r0, c7, c10, 1 @ Clean D cache line
238 mcr p15, 0, r0, c7, c6, 1 @ Invalidate D cache line
239 add r0, r0, #CACHELINESIZE
240 cmp r0, r1
241 blo 1b
242 tst r2, #VM_EXEC
243 mcrne p15, 0, ip, c7, c5, 6 @ Invalidate BTB
244 mcrne p15, 0, ip, c7, c10, 4 @ Drain Write (& Fill) Buffer
245 mov pc, lr
246
247/*
248 * coherent_kern_range(start, end)
249 *
250 * Ensure coherency between the Icache and the Dcache in the
251 * region described by start. If you have non-snooping
252 * Harvard caches, you need to implement this function.
253 *
254 * - start - virtual start address
255 * - end - virtual end address
256 *
257 * Note: single I-cache line invalidation isn't used here since
258 * it also trashes the mini I-cache used by JTAG debuggers.
259 */
260ENTRY(xscale_coherent_kern_range)
261 bic r0, r0, #CACHELINESIZE - 1
2621: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
263 add r0, r0, #CACHELINESIZE
264 cmp r0, r1
265 blo 1b
266 mov r0, #0
267 mcr p15, 0, r0, c7, c5, 0 @ Invalidate I cache & BTB
268 mcr p15, 0, r0, c7, c10, 4 @ Drain Write (& Fill) Buffer
269 mov pc, lr
270
271/*
272 * coherent_user_range(start, end)
273 *
274 * Ensure coherency between the Icache and the Dcache in the
275 * region described by start. If you have non-snooping
276 * Harvard caches, you need to implement this function.
277 *
278 * - start - virtual start address
279 * - end - virtual end address
280 */
281ENTRY(xscale_coherent_user_range)
282 bic r0, r0, #CACHELINESIZE - 1
2831: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
284 mcr p15, 0, r0, c7, c5, 1 @ Invalidate I cache entry
285 add r0, r0, #CACHELINESIZE
286 cmp r0, r1
287 blo 1b
288 mov r0, #0
289 mcr p15, 0, r0, c7, c5, 6 @ Invalidate BTB
290 mcr p15, 0, r0, c7, c10, 4 @ Drain Write (& Fill) Buffer
291 mov pc, lr
292
293/*
294 * flush_kern_dcache_area(void *addr, size_t size)
295 *
296 * Ensure no D cache aliasing occurs, either with itself or
297 * the I cache
298 *
299 * - addr - kernel address
300 * - size - region size
301 */
302ENTRY(xscale_flush_kern_dcache_area)
303 add r1, r0, r1
3041: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
305 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
306 add r0, r0, #CACHELINESIZE
307 cmp r0, r1
308 blo 1b
309 mov r0, #0
310 mcr p15, 0, r0, c7, c5, 0 @ Invalidate I cache & BTB
311 mcr p15, 0, r0, c7, c10, 4 @ Drain Write (& Fill) Buffer
312 mov pc, lr
313
314/*
315 * dma_inv_range(start, end)
316 *
317 * Invalidate (discard) the specified virtual address range.
318 * May not write back any entries. If 'start' or 'end'
319 * are not cache line aligned, those lines must be written
320 * back.
321 *
322 * - start - virtual start address
323 * - end - virtual end address
324 */
325xscale_dma_inv_range:
326 tst r0, #CACHELINESIZE - 1
327 bic r0, r0, #CACHELINESIZE - 1
328 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
329 tst r1, #CACHELINESIZE - 1
330 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
3311: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
332 add r0, r0, #CACHELINESIZE
333 cmp r0, r1
334 blo 1b
335 mcr p15, 0, r0, c7, c10, 4 @ Drain Write (& Fill) Buffer
336 mov pc, lr
337
338/*
339 * dma_clean_range(start, end)
340 *
341 * Clean the specified virtual address range.
342 *
343 * - start - virtual start address
344 * - end - virtual end address
345 */
346xscale_dma_clean_range:
347 bic r0, r0, #CACHELINESIZE - 1
3481: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
349 add r0, r0, #CACHELINESIZE
350 cmp r0, r1
351 blo 1b
352 mcr p15, 0, r0, c7, c10, 4 @ Drain Write (& Fill) Buffer
353 mov pc, lr
354
355/*
356 * dma_flush_range(start, end)
357 *
358 * Clean and invalidate the specified virtual address range.
359 *
360 * - start - virtual start address
361 * - end - virtual end address
362 */
363ENTRY(xscale_dma_flush_range)
364 bic r0, r0, #CACHELINESIZE - 1
3651: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
366 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
367 add r0, r0, #CACHELINESIZE
368 cmp r0, r1
369 blo 1b
370 mcr p15, 0, r0, c7, c10, 4 @ Drain Write (& Fill) Buffer
371 mov pc, lr
372
373/*
374 * dma_map_area(start, size, dir)
375 * - start - kernel virtual start address
376 * - size - size of region
377 * - dir - DMA direction
378 */
379ENTRY(xscale_dma_map_area)
380 add r1, r1, r0
381 cmp r2, #DMA_TO_DEVICE
382 beq xscale_dma_clean_range
383 bcs xscale_dma_inv_range
384 b xscale_dma_flush_range
385ENDPROC(xscale_dma_map_area)
386
387/*
388 * dma_map_area(start, size, dir)
389 * - start - kernel virtual start address
390 * - size - size of region
391 * - dir - DMA direction
392 */
393ENTRY(xscale_80200_A0_A1_dma_map_area)
394 add r1, r1, r0
395 teq r2, #DMA_TO_DEVICE
396 beq xscale_dma_clean_range
397 b xscale_dma_flush_range
398ENDPROC(xscale_80200_A0_A1_dma_map_area)
399
400/*
401 * dma_unmap_area(start, size, dir)
402 * - start - kernel virtual start address
403 * - size - size of region
404 * - dir - DMA direction
405 */
406ENTRY(xscale_dma_unmap_area)
407 mov pc, lr
408ENDPROC(xscale_dma_unmap_area)
409
410 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
411 define_cache_functions xscale
412
413/*
414 * On stepping A0/A1 of the 80200, invalidating D-cache by line doesn't
415 * clear the dirty bits, which means that if we invalidate a dirty line,
416 * the dirty data can still be written back to external memory later on.
417 *
418 * The recommended workaround is to always do a clean D-cache line before
419 * doing an invalidate D-cache line, so on the affected processors,
420 * dma_inv_range() is implemented as dma_flush_range().
421 *
422 * See erratum #25 of "Intel 80200 Processor Specification Update",
423 * revision January 22, 2003, available at:
424 * http://www.intel.com/design/iio/specupdt/273415.htm
425 */
426.macro a0_alias basename
427 .globl xscale_80200_A0_A1_\basename
428 .type xscale_80200_A0_A1_\basename , %function
429 .equ xscale_80200_A0_A1_\basename , xscale_\basename
430.endm
431
432/*
433 * Most of the cache functions are unchanged for these processor revisions.
434 * Export suitable alias symbols for the unchanged functions:
435 */
436 a0_alias flush_icache_all
437 a0_alias flush_user_cache_all
438 a0_alias flush_kern_cache_all
439 a0_alias flush_user_cache_range
440 a0_alias coherent_kern_range
441 a0_alias coherent_user_range
442 a0_alias flush_kern_dcache_area
443 a0_alias dma_flush_range
444 a0_alias dma_unmap_area
445
446 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
447 define_cache_functions xscale_80200_A0_A1
448
449ENTRY(cpu_xscale_dcache_clean_area)
4501: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
451 add r0, r0, #CACHELINESIZE
452 subs r1, r1, #CACHELINESIZE
453 bhi 1b
454 mov pc, lr
455
456/* =============================== PageTable ============================== */
457
458/*
459 * cpu_xscale_switch_mm(pgd)
460 *
461 * Set the translation base pointer to be as described by pgd.
462 *
463 * pgd: new page tables
464 */
465 .align 5
466ENTRY(cpu_xscale_switch_mm)
467 clean_d_cache r1, r2
468 mcr p15, 0, ip, c7, c5, 0 @ Invalidate I cache & BTB
469 mcr p15, 0, ip, c7, c10, 4 @ Drain Write (& Fill) Buffer
470 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
471 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
472 cpwait_ret lr, ip
473
474/*
475 * cpu_xscale_set_pte_ext(ptep, pte, ext)
476 *
477 * Set a PTE and flush it out
478 *
479 * Errata 40: must set memory to write-through for user read-only pages.
480 */
481cpu_xscale_mt_table:
482 .long 0x00 @ L_PTE_MT_UNCACHED
483 .long PTE_BUFFERABLE @ L_PTE_MT_BUFFERABLE
484 .long PTE_CACHEABLE @ L_PTE_MT_WRITETHROUGH
485 .long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEBACK
486 .long PTE_EXT_TEX(1) | PTE_BUFFERABLE @ L_PTE_MT_DEV_SHARED
487 .long 0x00 @ unused
488 .long PTE_EXT_TEX(1) | PTE_CACHEABLE @ L_PTE_MT_MINICACHE
489 .long PTE_EXT_TEX(1) | PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEALLOC
490 .long 0x00 @ unused
491 .long PTE_BUFFERABLE @ L_PTE_MT_DEV_WC
492 .long 0x00 @ unused
493 .long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_DEV_CACHED
494 .long 0x00 @ L_PTE_MT_DEV_NONSHARED
495 .long 0x00 @ unused
496 .long 0x00 @ unused
497 .long 0x00 @ unused
498
499 .align 5
500ENTRY(cpu_xscale_set_pte_ext)
501 xscale_set_pte_ext_prologue
502
503 @
504 @ Erratum 40: must set memory to write-through for user read-only pages
505 @
506 and ip, r1, #(L_PTE_MT_MASK | L_PTE_USER | L_PTE_RDONLY) & ~(4 << 2)
507 teq ip, #L_PTE_MT_WRITEBACK | L_PTE_USER | L_PTE_RDONLY
508
509 moveq r1, #L_PTE_MT_WRITETHROUGH
510 and r1, r1, #L_PTE_MT_MASK
511 adr ip, cpu_xscale_mt_table
512 ldr ip, [ip, r1]
513 bic r2, r2, #0x0c
514 orr r2, r2, ip
515
516 xscale_set_pte_ext_epilogue
517 mov pc, lr
518
519 .ltorg
520 .align
521
522.globl cpu_xscale_suspend_size
523.equ cpu_xscale_suspend_size, 4 * 7
524#ifdef CONFIG_PM_SLEEP
525ENTRY(cpu_xscale_do_suspend)
526 stmfd sp!, {r4 - r10, lr}
527 mrc p14, 0, r4, c6, c0, 0 @ clock configuration, for turbo mode
528 mrc p15, 0, r5, c15, c1, 0 @ CP access reg
529 mrc p15, 0, r6, c13, c0, 0 @ PID
530 mrc p15, 0, r7, c3, c0, 0 @ domain ID
531 mrc p15, 0, r8, c2, c0, 0 @ translation table base addr
532 mrc p15, 0, r9, c1, c1, 0 @ auxiliary control reg
533 mrc p15, 0, r10, c1, c0, 0 @ control reg
534 bic r4, r4, #2 @ clear frequency change bit
535 stmia r0, {r4 - r10} @ store cp regs
536 ldmfd sp!, {r4 - r10, pc}
537ENDPROC(cpu_xscale_do_suspend)
538
539ENTRY(cpu_xscale_do_resume)
540 ldmia r0, {r4 - r10} @ load cp regs
541 mov ip, #0
542 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
543 mcr p15, 0, ip, c7, c7, 0 @ invalidate I & D caches, BTB
544 mcr p14, 0, r4, c6, c0, 0 @ clock configuration, turbo mode.
545 mcr p15, 0, r5, c15, c1, 0 @ CP access reg
546 mcr p15, 0, r6, c13, c0, 0 @ PID
547 mcr p15, 0, r7, c3, c0, 0 @ domain ID
548 mcr p15, 0, r8, c2, c0, 0 @ translation table base addr
549 mcr p15, 0, r9, c1, c1, 0 @ auxiliary control reg
550 mov r0, r10 @ control register
551 mov r2, r8, lsr #14 @ get TTB0 base
552 mov r2, r2, lsl #14
553 ldr r3, =PMD_TYPE_SECT | PMD_SECT_BUFFERABLE | \
554 PMD_SECT_CACHEABLE | PMD_SECT_AP_WRITE
555 b cpu_resume_mmu
556ENDPROC(cpu_xscale_do_resume)
557#endif
558
559 __CPUINIT
560
561 .type __xscale_setup, #function
562__xscale_setup:
563 mcr p15, 0, ip, c7, c7, 0 @ invalidate I, D caches & BTB
564 mcr p15, 0, ip, c7, c10, 4 @ Drain Write (& Fill) Buffer
565 mcr p15, 0, ip, c8, c7, 0 @ invalidate I, D TLBs
566 mov r0, #1 << 6 @ cp6 for IOP3xx and Bulverde
567 orr r0, r0, #1 << 13 @ Its undefined whether this
568 mcr p15, 0, r0, c15, c1, 0 @ affects USR or SVC modes
569
570 adr r5, xscale_crval
571 ldmia r5, {r5, r6}
572 mrc p15, 0, r0, c1, c0, 0 @ get control register
573 bic r0, r0, r5
574 orr r0, r0, r6
575 mov pc, lr
576 .size __xscale_setup, . - __xscale_setup
577
578 /*
579 * R
580 * .RVI ZFRS BLDP WCAM
581 * ..11 1.01 .... .101
582 *
583 */
584 .type xscale_crval, #object
585xscale_crval:
586 crval clear=0x00003b07, mmuset=0x00003905, ucset=0x00001900
587
588 __INITDATA
589
590 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
591 define_processor_functions xscale, dabort=v5t_early_abort, pabort=legacy_pabort, suspend=1
592
593 .section ".rodata"
594
595 string cpu_arch_name, "armv5te"
596 string cpu_elf_name, "v5"
597
598 string cpu_80200_A0_A1_name, "XScale-80200 A0/A1"
599 string cpu_80200_name, "XScale-80200"
600 string cpu_80219_name, "XScale-80219"
601 string cpu_8032x_name, "XScale-IOP8032x Family"
602 string cpu_8033x_name, "XScale-IOP8033x Family"
603 string cpu_pxa250_name, "XScale-PXA250"
604 string cpu_pxa210_name, "XScale-PXA210"
605 string cpu_ixp42x_name, "XScale-IXP42x Family"
606 string cpu_ixp43x_name, "XScale-IXP43x Family"
607 string cpu_ixp46x_name, "XScale-IXP46x Family"
608 string cpu_ixp2400_name, "XScale-IXP2400"
609 string cpu_ixp2800_name, "XScale-IXP2800"
610 string cpu_pxa255_name, "XScale-PXA255"
611 string cpu_pxa270_name, "XScale-PXA270"
612
613 .align
614
615 .section ".proc.info.init", #alloc, #execinstr
616
617.macro xscale_proc_info name:req, cpu_val:req, cpu_mask:req, cpu_name:req, cache
618 .type __\name\()_proc_info,#object
619__\name\()_proc_info:
620 .long \cpu_val
621 .long \cpu_mask
622 .long PMD_TYPE_SECT | \
623 PMD_SECT_BUFFERABLE | \
624 PMD_SECT_CACHEABLE | \
625 PMD_SECT_AP_WRITE | \
626 PMD_SECT_AP_READ
627 .long PMD_TYPE_SECT | \
628 PMD_SECT_AP_WRITE | \
629 PMD_SECT_AP_READ
630 b __xscale_setup
631 .long cpu_arch_name
632 .long cpu_elf_name
633 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
634 .long \cpu_name
635 .long xscale_processor_functions
636 .long v4wbi_tlb_fns
637 .long xscale_mc_user_fns
638 .ifb \cache
639 .long xscale_cache_fns
640 .else
641 .long \cache
642 .endif
643 .size __\name\()_proc_info, . - __\name\()_proc_info
644.endm
645
646 xscale_proc_info 80200_A0_A1, 0x69052000, 0xfffffffe, cpu_80200_name, \
647 cache=xscale_80200_A0_A1_cache_fns
648 xscale_proc_info 80200, 0x69052000, 0xfffffff0, cpu_80200_name
649 xscale_proc_info 80219, 0x69052e20, 0xffffffe0, cpu_80219_name
650 xscale_proc_info 8032x, 0x69052420, 0xfffff7e0, cpu_8032x_name
651 xscale_proc_info 8033x, 0x69054010, 0xfffffd30, cpu_8033x_name
652 xscale_proc_info pxa250, 0x69052100, 0xfffff7f0, cpu_pxa250_name
653 xscale_proc_info pxa210, 0x69052120, 0xfffff3f0, cpu_pxa210_name
654 xscale_proc_info ixp2400, 0x69054190, 0xfffffff0, cpu_ixp2400_name
655 xscale_proc_info ixp2800, 0x690541a0, 0xfffffff0, cpu_ixp2800_name
656 xscale_proc_info ixp42x, 0x690541c0, 0xffffffc0, cpu_ixp42x_name
657 xscale_proc_info ixp43x, 0x69054040, 0xfffffff0, cpu_ixp43x_name
658 xscale_proc_info ixp46x, 0x69054200, 0xffffff00, cpu_ixp46x_name
659 xscale_proc_info pxa255, 0x69052d00, 0xfffffff0, cpu_pxa255_name
660 xscale_proc_info pxa270, 0x69054110, 0xfffffff0, cpu_pxa270_name
1/*
2 * linux/arch/arm/mm/proc-xscale.S
3 *
4 * Author: Nicolas Pitre
5 * Created: November 2000
6 * Copyright: (C) 2000, 2001 MontaVista Software Inc.
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 version 2 as
10 * published by the Free Software Foundation.
11 *
12 * MMU functions for the Intel XScale CPUs
13 *
14 * 2001 Aug 21:
15 * some contributions by Brett Gaines <brett.w.gaines@intel.com>
16 * Copyright 2001 by Intel Corp.
17 *
18 * 2001 Sep 08:
19 * Completely revisited, many important fixes
20 * Nicolas Pitre <nico@fluxnic.net>
21 */
22
23#include <linux/linkage.h>
24#include <linux/init.h>
25#include <asm/assembler.h>
26#include <asm/hwcap.h>
27#include <asm/pgtable.h>
28#include <asm/pgtable-hwdef.h>
29#include <asm/page.h>
30#include <asm/ptrace.h>
31#include "proc-macros.S"
32
33/*
34 * This is the maximum size of an area which will be flushed. If the area
35 * is larger than this, then we flush the whole cache
36 */
37#define MAX_AREA_SIZE 32768
38
39/*
40 * the cache line size of the I and D cache
41 */
42#define CACHELINESIZE 32
43
44/*
45 * the size of the data cache
46 */
47#define CACHESIZE 32768
48
49/*
50 * Virtual address used to allocate the cache when flushed
51 *
52 * This must be an address range which is _never_ used. It should
53 * apparently have a mapping in the corresponding page table for
54 * compatibility with future CPUs that _could_ require it. For instance we
55 * don't care.
56 *
57 * This must be aligned on a 2*CACHESIZE boundary. The code selects one of
58 * the 2 areas in alternance each time the clean_d_cache macro is used.
59 * Without this the XScale core exhibits cache eviction problems and no one
60 * knows why.
61 *
62 * Reminder: the vector table is located at 0xffff0000-0xffff0fff.
63 */
64#define CLEAN_ADDR 0xfffe0000
65
66/*
67 * This macro is used to wait for a CP15 write and is needed
68 * when we have to ensure that the last operation to the co-pro
69 * was completed before continuing with operation.
70 */
71 .macro cpwait, rd
72 mrc p15, 0, \rd, c2, c0, 0 @ arbitrary read of cp15
73 mov \rd, \rd @ wait for completion
74 sub pc, pc, #4 @ flush instruction pipeline
75 .endm
76
77 .macro cpwait_ret, lr, rd
78 mrc p15, 0, \rd, c2, c0, 0 @ arbitrary read of cp15
79 sub pc, \lr, \rd, LSR #32 @ wait for completion and
80 @ flush instruction pipeline
81 .endm
82
83/*
84 * This macro cleans the entire dcache using line allocate.
85 * The main loop has been unrolled to reduce loop overhead.
86 * rd and rs are two scratch registers.
87 */
88 .macro clean_d_cache, rd, rs
89 ldr \rs, =clean_addr
90 ldr \rd, [\rs]
91 eor \rd, \rd, #CACHESIZE
92 str \rd, [\rs]
93 add \rs, \rd, #CACHESIZE
941: mcr p15, 0, \rd, c7, c2, 5 @ allocate D cache line
95 add \rd, \rd, #CACHELINESIZE
96 mcr p15, 0, \rd, c7, c2, 5 @ allocate D cache line
97 add \rd, \rd, #CACHELINESIZE
98 mcr p15, 0, \rd, c7, c2, 5 @ allocate D cache line
99 add \rd, \rd, #CACHELINESIZE
100 mcr p15, 0, \rd, c7, c2, 5 @ allocate D cache line
101 add \rd, \rd, #CACHELINESIZE
102 teq \rd, \rs
103 bne 1b
104 .endm
105
106 .data
107 .align 2
108clean_addr: .word CLEAN_ADDR
109
110 .text
111
112/*
113 * cpu_xscale_proc_init()
114 *
115 * Nothing too exciting at the moment
116 */
117ENTRY(cpu_xscale_proc_init)
118 @ enable write buffer coalescing. Some bootloader disable it
119 mrc p15, 0, r1, c1, c0, 1
120 bic r1, r1, #1
121 mcr p15, 0, r1, c1, c0, 1
122 ret lr
123
124/*
125 * cpu_xscale_proc_fin()
126 */
127ENTRY(cpu_xscale_proc_fin)
128 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
129 bic r0, r0, #0x1800 @ ...IZ...........
130 bic r0, r0, #0x0006 @ .............CA.
131 mcr p15, 0, r0, c1, c0, 0 @ disable caches
132 ret lr
133
134/*
135 * cpu_xscale_reset(loc)
136 *
137 * Perform a soft reset of the system. Put the CPU into the
138 * same state as it would be if it had been reset, and branch
139 * to what would be the reset vector.
140 *
141 * loc: location to jump to for soft reset
142 *
143 * Beware PXA270 erratum E7.
144 */
145 .align 5
146 .pushsection .idmap.text, "ax"
147ENTRY(cpu_xscale_reset)
148 mov r1, #PSR_F_BIT|PSR_I_BIT|SVC_MODE
149 msr cpsr_c, r1 @ reset CPSR
150 mcr p15, 0, r1, c10, c4, 1 @ unlock I-TLB
151 mcr p15, 0, r1, c8, c5, 0 @ invalidate I-TLB
152 mrc p15, 0, r1, c1, c0, 0 @ ctrl register
153 bic r1, r1, #0x0086 @ ........B....CA.
154 bic r1, r1, #0x3900 @ ..VIZ..S........
155 sub pc, pc, #4 @ flush pipeline
156 @ *** cache line aligned ***
157 mcr p15, 0, r1, c1, c0, 0 @ ctrl register
158 bic r1, r1, #0x0001 @ ...............M
159 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches & BTB
160 mcr p15, 0, r1, c1, c0, 0 @ ctrl register
161 @ CAUTION: MMU turned off from this point. We count on the pipeline
162 @ already containing those two last instructions to survive.
163 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
164 ret r0
165ENDPROC(cpu_xscale_reset)
166 .popsection
167
168/*
169 * cpu_xscale_do_idle()
170 *
171 * Cause the processor to idle
172 *
173 * For now we do nothing but go to idle mode for every case
174 *
175 * XScale supports clock switching, but using idle mode support
176 * allows external hardware to react to system state changes.
177 */
178 .align 5
179
180ENTRY(cpu_xscale_do_idle)
181 mov r0, #1
182 mcr p14, 0, r0, c7, c0, 0 @ Go to IDLE
183 ret lr
184
185/* ================================= CACHE ================================ */
186
187/*
188 * flush_icache_all()
189 *
190 * Unconditionally clean and invalidate the entire icache.
191 */
192ENTRY(xscale_flush_icache_all)
193 mov r0, #0
194 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
195 ret lr
196ENDPROC(xscale_flush_icache_all)
197
198/*
199 * flush_user_cache_all()
200 *
201 * Invalidate all cache entries in a particular address
202 * space.
203 */
204ENTRY(xscale_flush_user_cache_all)
205 /* FALLTHROUGH */
206
207/*
208 * flush_kern_cache_all()
209 *
210 * Clean and invalidate the entire cache.
211 */
212ENTRY(xscale_flush_kern_cache_all)
213 mov r2, #VM_EXEC
214 mov ip, #0
215__flush_whole_cache:
216 clean_d_cache r0, r1
217 tst r2, #VM_EXEC
218 mcrne p15, 0, ip, c7, c5, 0 @ Invalidate I cache & BTB
219 mcrne p15, 0, ip, c7, c10, 4 @ Drain Write (& Fill) Buffer
220 ret lr
221
222/*
223 * flush_user_cache_range(start, end, vm_flags)
224 *
225 * Invalidate a range of cache entries in the specified
226 * address space.
227 *
228 * - start - start address (may not be aligned)
229 * - end - end address (exclusive, may not be aligned)
230 * - vma - vma_area_struct describing address space
231 */
232 .align 5
233ENTRY(xscale_flush_user_cache_range)
234 mov ip, #0
235 sub r3, r1, r0 @ calculate total size
236 cmp r3, #MAX_AREA_SIZE
237 bhs __flush_whole_cache
238
2391: tst r2, #VM_EXEC
240 mcrne p15, 0, r0, c7, c5, 1 @ Invalidate I cache line
241 mcr p15, 0, r0, c7, c10, 1 @ Clean D cache line
242 mcr p15, 0, r0, c7, c6, 1 @ Invalidate D cache line
243 add r0, r0, #CACHELINESIZE
244 cmp r0, r1
245 blo 1b
246 tst r2, #VM_EXEC
247 mcrne p15, 0, ip, c7, c5, 6 @ Invalidate BTB
248 mcrne p15, 0, ip, c7, c10, 4 @ Drain Write (& Fill) Buffer
249 ret lr
250
251/*
252 * coherent_kern_range(start, end)
253 *
254 * Ensure coherency between the Icache and the Dcache in the
255 * region described by start. If you have non-snooping
256 * Harvard caches, you need to implement this function.
257 *
258 * - start - virtual start address
259 * - end - virtual end address
260 *
261 * Note: single I-cache line invalidation isn't used here since
262 * it also trashes the mini I-cache used by JTAG debuggers.
263 */
264ENTRY(xscale_coherent_kern_range)
265 bic r0, r0, #CACHELINESIZE - 1
2661: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
267 add r0, r0, #CACHELINESIZE
268 cmp r0, r1
269 blo 1b
270 mov r0, #0
271 mcr p15, 0, r0, c7, c5, 0 @ Invalidate I cache & BTB
272 mcr p15, 0, r0, c7, c10, 4 @ Drain Write (& Fill) Buffer
273 ret lr
274
275/*
276 * coherent_user_range(start, end)
277 *
278 * Ensure coherency between the Icache and the Dcache in the
279 * region described by start. If you have non-snooping
280 * Harvard caches, you need to implement this function.
281 *
282 * - start - virtual start address
283 * - end - virtual end address
284 */
285ENTRY(xscale_coherent_user_range)
286 bic r0, r0, #CACHELINESIZE - 1
2871: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
288 mcr p15, 0, r0, c7, c5, 1 @ Invalidate I cache entry
289 add r0, r0, #CACHELINESIZE
290 cmp r0, r1
291 blo 1b
292 mov r0, #0
293 mcr p15, 0, r0, c7, c5, 6 @ Invalidate BTB
294 mcr p15, 0, r0, c7, c10, 4 @ Drain Write (& Fill) Buffer
295 ret lr
296
297/*
298 * flush_kern_dcache_area(void *addr, size_t size)
299 *
300 * Ensure no D cache aliasing occurs, either with itself or
301 * the I cache
302 *
303 * - addr - kernel address
304 * - size - region size
305 */
306ENTRY(xscale_flush_kern_dcache_area)
307 add r1, r0, r1
3081: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
309 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
310 add r0, r0, #CACHELINESIZE
311 cmp r0, r1
312 blo 1b
313 mov r0, #0
314 mcr p15, 0, r0, c7, c5, 0 @ Invalidate I cache & BTB
315 mcr p15, 0, r0, c7, c10, 4 @ Drain Write (& Fill) Buffer
316 ret lr
317
318/*
319 * dma_inv_range(start, end)
320 *
321 * Invalidate (discard) the specified virtual address range.
322 * May not write back any entries. If 'start' or 'end'
323 * are not cache line aligned, those lines must be written
324 * back.
325 *
326 * - start - virtual start address
327 * - end - virtual end address
328 */
329xscale_dma_inv_range:
330 tst r0, #CACHELINESIZE - 1
331 bic r0, r0, #CACHELINESIZE - 1
332 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
333 tst r1, #CACHELINESIZE - 1
334 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
3351: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
336 add r0, r0, #CACHELINESIZE
337 cmp r0, r1
338 blo 1b
339 mcr p15, 0, r0, c7, c10, 4 @ Drain Write (& Fill) Buffer
340 ret lr
341
342/*
343 * dma_clean_range(start, end)
344 *
345 * Clean the specified virtual address range.
346 *
347 * - start - virtual start address
348 * - end - virtual end address
349 */
350xscale_dma_clean_range:
351 bic r0, r0, #CACHELINESIZE - 1
3521: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
353 add r0, r0, #CACHELINESIZE
354 cmp r0, r1
355 blo 1b
356 mcr p15, 0, r0, c7, c10, 4 @ Drain Write (& Fill) Buffer
357 ret lr
358
359/*
360 * dma_flush_range(start, end)
361 *
362 * Clean and invalidate the specified virtual address range.
363 *
364 * - start - virtual start address
365 * - end - virtual end address
366 */
367ENTRY(xscale_dma_flush_range)
368 bic r0, r0, #CACHELINESIZE - 1
3691: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
370 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
371 add r0, r0, #CACHELINESIZE
372 cmp r0, r1
373 blo 1b
374 mcr p15, 0, r0, c7, c10, 4 @ Drain Write (& Fill) Buffer
375 ret lr
376
377/*
378 * dma_map_area(start, size, dir)
379 * - start - kernel virtual start address
380 * - size - size of region
381 * - dir - DMA direction
382 */
383ENTRY(xscale_dma_map_area)
384 add r1, r1, r0
385 cmp r2, #DMA_TO_DEVICE
386 beq xscale_dma_clean_range
387 bcs xscale_dma_inv_range
388 b xscale_dma_flush_range
389ENDPROC(xscale_dma_map_area)
390
391/*
392 * dma_map_area(start, size, dir)
393 * - start - kernel virtual start address
394 * - size - size of region
395 * - dir - DMA direction
396 */
397ENTRY(xscale_80200_A0_A1_dma_map_area)
398 add r1, r1, r0
399 teq r2, #DMA_TO_DEVICE
400 beq xscale_dma_clean_range
401 b xscale_dma_flush_range
402ENDPROC(xscale_80200_A0_A1_dma_map_area)
403
404/*
405 * dma_unmap_area(start, size, dir)
406 * - start - kernel virtual start address
407 * - size - size of region
408 * - dir - DMA direction
409 */
410ENTRY(xscale_dma_unmap_area)
411 ret lr
412ENDPROC(xscale_dma_unmap_area)
413
414 .globl xscale_flush_kern_cache_louis
415 .equ xscale_flush_kern_cache_louis, xscale_flush_kern_cache_all
416
417 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
418 define_cache_functions xscale
419
420/*
421 * On stepping A0/A1 of the 80200, invalidating D-cache by line doesn't
422 * clear the dirty bits, which means that if we invalidate a dirty line,
423 * the dirty data can still be written back to external memory later on.
424 *
425 * The recommended workaround is to always do a clean D-cache line before
426 * doing an invalidate D-cache line, so on the affected processors,
427 * dma_inv_range() is implemented as dma_flush_range().
428 *
429 * See erratum #25 of "Intel 80200 Processor Specification Update",
430 * revision January 22, 2003, available at:
431 * http://www.intel.com/design/iio/specupdt/273415.htm
432 */
433.macro a0_alias basename
434 .globl xscale_80200_A0_A1_\basename
435 .type xscale_80200_A0_A1_\basename , %function
436 .equ xscale_80200_A0_A1_\basename , xscale_\basename
437.endm
438
439/*
440 * Most of the cache functions are unchanged for these processor revisions.
441 * Export suitable alias symbols for the unchanged functions:
442 */
443 a0_alias flush_icache_all
444 a0_alias flush_user_cache_all
445 a0_alias flush_kern_cache_all
446 a0_alias flush_kern_cache_louis
447 a0_alias flush_user_cache_range
448 a0_alias coherent_kern_range
449 a0_alias coherent_user_range
450 a0_alias flush_kern_dcache_area
451 a0_alias dma_flush_range
452 a0_alias dma_unmap_area
453
454 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
455 define_cache_functions xscale_80200_A0_A1
456
457ENTRY(cpu_xscale_dcache_clean_area)
4581: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
459 add r0, r0, #CACHELINESIZE
460 subs r1, r1, #CACHELINESIZE
461 bhi 1b
462 ret lr
463
464/* =============================== PageTable ============================== */
465
466/*
467 * cpu_xscale_switch_mm(pgd)
468 *
469 * Set the translation base pointer to be as described by pgd.
470 *
471 * pgd: new page tables
472 */
473 .align 5
474ENTRY(cpu_xscale_switch_mm)
475 clean_d_cache r1, r2
476 mcr p15, 0, ip, c7, c5, 0 @ Invalidate I cache & BTB
477 mcr p15, 0, ip, c7, c10, 4 @ Drain Write (& Fill) Buffer
478 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
479 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
480 cpwait_ret lr, ip
481
482/*
483 * cpu_xscale_set_pte_ext(ptep, pte, ext)
484 *
485 * Set a PTE and flush it out
486 *
487 * Errata 40: must set memory to write-through for user read-only pages.
488 */
489cpu_xscale_mt_table:
490 .long 0x00 @ L_PTE_MT_UNCACHED
491 .long PTE_BUFFERABLE @ L_PTE_MT_BUFFERABLE
492 .long PTE_CACHEABLE @ L_PTE_MT_WRITETHROUGH
493 .long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEBACK
494 .long PTE_EXT_TEX(1) | PTE_BUFFERABLE @ L_PTE_MT_DEV_SHARED
495 .long 0x00 @ unused
496 .long PTE_EXT_TEX(1) | PTE_CACHEABLE @ L_PTE_MT_MINICACHE
497 .long PTE_EXT_TEX(1) | PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEALLOC
498 .long 0x00 @ unused
499 .long PTE_BUFFERABLE @ L_PTE_MT_DEV_WC
500 .long 0x00 @ unused
501 .long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_DEV_CACHED
502 .long 0x00 @ L_PTE_MT_DEV_NONSHARED
503 .long 0x00 @ unused
504 .long 0x00 @ unused
505 .long 0x00 @ unused
506
507 .align 5
508ENTRY(cpu_xscale_set_pte_ext)
509 xscale_set_pte_ext_prologue
510
511 @
512 @ Erratum 40: must set memory to write-through for user read-only pages
513 @
514 and ip, r1, #(L_PTE_MT_MASK | L_PTE_USER | L_PTE_RDONLY) & ~(4 << 2)
515 teq ip, #L_PTE_MT_WRITEBACK | L_PTE_USER | L_PTE_RDONLY
516
517 moveq r1, #L_PTE_MT_WRITETHROUGH
518 and r1, r1, #L_PTE_MT_MASK
519 adr ip, cpu_xscale_mt_table
520 ldr ip, [ip, r1]
521 bic r2, r2, #0x0c
522 orr r2, r2, ip
523
524 xscale_set_pte_ext_epilogue
525 ret lr
526
527 .ltorg
528 .align
529
530.globl cpu_xscale_suspend_size
531.equ cpu_xscale_suspend_size, 4 * 6
532#ifdef CONFIG_ARM_CPU_SUSPEND
533ENTRY(cpu_xscale_do_suspend)
534 stmfd sp!, {r4 - r9, lr}
535 mrc p14, 0, r4, c6, c0, 0 @ clock configuration, for turbo mode
536 mrc p15, 0, r5, c15, c1, 0 @ CP access reg
537 mrc p15, 0, r6, c13, c0, 0 @ PID
538 mrc p15, 0, r7, c3, c0, 0 @ domain ID
539 mrc p15, 0, r8, c1, c0, 1 @ auxiliary control reg
540 mrc p15, 0, r9, c1, c0, 0 @ control reg
541 bic r4, r4, #2 @ clear frequency change bit
542 stmia r0, {r4 - r9} @ store cp regs
543 ldmfd sp!, {r4 - r9, pc}
544ENDPROC(cpu_xscale_do_suspend)
545
546ENTRY(cpu_xscale_do_resume)
547 ldmia r0, {r4 - r9} @ load cp regs
548 mov ip, #0
549 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
550 mcr p15, 0, ip, c7, c7, 0 @ invalidate I & D caches, BTB
551 mcr p14, 0, r4, c6, c0, 0 @ clock configuration, turbo mode.
552 mcr p15, 0, r5, c15, c1, 0 @ CP access reg
553 mcr p15, 0, r6, c13, c0, 0 @ PID
554 mcr p15, 0, r7, c3, c0, 0 @ domain ID
555 mcr p15, 0, r1, c2, c0, 0 @ translation table base addr
556 mcr p15, 0, r8, c1, c0, 1 @ auxiliary control reg
557 mov r0, r9 @ control register
558 b cpu_resume_mmu
559ENDPROC(cpu_xscale_do_resume)
560#endif
561
562 .type __xscale_setup, #function
563__xscale_setup:
564 mcr p15, 0, ip, c7, c7, 0 @ invalidate I, D caches & BTB
565 mcr p15, 0, ip, c7, c10, 4 @ Drain Write (& Fill) Buffer
566 mcr p15, 0, ip, c8, c7, 0 @ invalidate I, D TLBs
567 mov r0, #1 << 6 @ cp6 for IOP3xx and Bulverde
568 orr r0, r0, #1 << 13 @ Its undefined whether this
569 mcr p15, 0, r0, c15, c1, 0 @ affects USR or SVC modes
570
571 adr r5, xscale_crval
572 ldmia r5, {r5, r6}
573 mrc p15, 0, r0, c1, c0, 0 @ get control register
574 bic r0, r0, r5
575 orr r0, r0, r6
576 ret lr
577 .size __xscale_setup, . - __xscale_setup
578
579 /*
580 * R
581 * .RVI ZFRS BLDP WCAM
582 * ..11 1.01 .... .101
583 *
584 */
585 .type xscale_crval, #object
586xscale_crval:
587 crval clear=0x00003b07, mmuset=0x00003905, ucset=0x00001900
588
589 __INITDATA
590
591 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
592 define_processor_functions xscale, dabort=v5t_early_abort, pabort=legacy_pabort, suspend=1
593
594 .section ".rodata"
595
596 string cpu_arch_name, "armv5te"
597 string cpu_elf_name, "v5"
598
599 string cpu_80200_A0_A1_name, "XScale-80200 A0/A1"
600 string cpu_80200_name, "XScale-80200"
601 string cpu_80219_name, "XScale-80219"
602 string cpu_8032x_name, "XScale-IOP8032x Family"
603 string cpu_8033x_name, "XScale-IOP8033x Family"
604 string cpu_pxa250_name, "XScale-PXA250"
605 string cpu_pxa210_name, "XScale-PXA210"
606 string cpu_ixp42x_name, "XScale-IXP42x Family"
607 string cpu_ixp43x_name, "XScale-IXP43x Family"
608 string cpu_ixp46x_name, "XScale-IXP46x Family"
609 string cpu_ixp2400_name, "XScale-IXP2400"
610 string cpu_ixp2800_name, "XScale-IXP2800"
611 string cpu_pxa255_name, "XScale-PXA255"
612 string cpu_pxa270_name, "XScale-PXA270"
613
614 .align
615
616 .section ".proc.info.init", #alloc
617
618.macro xscale_proc_info name:req, cpu_val:req, cpu_mask:req, cpu_name:req, cache
619 .type __\name\()_proc_info,#object
620__\name\()_proc_info:
621 .long \cpu_val
622 .long \cpu_mask
623 .long PMD_TYPE_SECT | \
624 PMD_SECT_BUFFERABLE | \
625 PMD_SECT_CACHEABLE | \
626 PMD_SECT_AP_WRITE | \
627 PMD_SECT_AP_READ
628 .long PMD_TYPE_SECT | \
629 PMD_SECT_AP_WRITE | \
630 PMD_SECT_AP_READ
631 initfn __xscale_setup, __\name\()_proc_info
632 .long cpu_arch_name
633 .long cpu_elf_name
634 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
635 .long \cpu_name
636 .long xscale_processor_functions
637 .long v4wbi_tlb_fns
638 .long xscale_mc_user_fns
639 .ifb \cache
640 .long xscale_cache_fns
641 .else
642 .long \cache
643 .endif
644 .size __\name\()_proc_info, . - __\name\()_proc_info
645.endm
646
647 xscale_proc_info 80200_A0_A1, 0x69052000, 0xfffffffe, cpu_80200_name, \
648 cache=xscale_80200_A0_A1_cache_fns
649 xscale_proc_info 80200, 0x69052000, 0xfffffff0, cpu_80200_name
650 xscale_proc_info 80219, 0x69052e20, 0xffffffe0, cpu_80219_name
651 xscale_proc_info 8032x, 0x69052420, 0xfffff7e0, cpu_8032x_name
652 xscale_proc_info 8033x, 0x69054010, 0xfffffd30, cpu_8033x_name
653 xscale_proc_info pxa250, 0x69052100, 0xfffff7f0, cpu_pxa250_name
654 xscale_proc_info pxa210, 0x69052120, 0xfffff3f0, cpu_pxa210_name
655 xscale_proc_info ixp2400, 0x69054190, 0xfffffff0, cpu_ixp2400_name
656 xscale_proc_info ixp2800, 0x690541a0, 0xfffffff0, cpu_ixp2800_name
657 xscale_proc_info ixp42x, 0x690541c0, 0xffffffc0, cpu_ixp42x_name
658 xscale_proc_info ixp43x, 0x69054040, 0xfffffff0, cpu_ixp43x_name
659 xscale_proc_info ixp46x, 0x69054200, 0xffffff00, cpu_ixp46x_name
660 xscale_proc_info pxa255, 0x69052d00, 0xfffffff0, cpu_pxa255_name
661 xscale_proc_info pxa270, 0x69054110, 0xfffffff0, cpu_pxa270_name