proc-xscale.S 18.4 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660
/*
 *  linux/arch/arm/mm/proc-xscale.S
 *
 *  Author:	Nicolas Pitre
 *  Created:	November 2000
 *  Copyright:	(C) 2000, 2001 MontaVista Software Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * MMU functions for the Intel XScale CPUs
 *
 * 2001 Aug 21:
 *	some contributions by Brett Gaines <brett.w.gaines@intel.com>
 *	Copyright 2001 by Intel Corp.
 *
 * 2001 Sep 08:
 *	Completely revisited, many important fixes
 *	Nicolas Pitre <nico@fluxnic.net>
 */

#include <linux/linkage.h>
#include <linux/init.h>
#include <asm/assembler.h>
#include <asm/hwcap.h>
#include <asm/pgtable.h>
#include <asm/pgtable-hwdef.h>
#include <asm/page.h>
#include <asm/ptrace.h>
#include "proc-macros.S"

/*
 * This is the maximum size of an area which will be flushed.  If the area
 * is larger than this, then we flush the whole cache
 */
#define MAX_AREA_SIZE	32768

/*
 * the cache line size of the I and D cache
 */
#define CACHELINESIZE	32

/*
 * the size of the data cache
 */
#define CACHESIZE	32768

/*
 * Virtual address used to allocate the cache when flushed
 *
 * This must be an address range which is _never_ used.  It should
 * apparently have a mapping in the corresponding page table for
 * compatibility with future CPUs that _could_ require it.  For instance we
 * don't care.
 *
 * This must be aligned on a 2*CACHESIZE boundary.  The code selects one of
 * the 2 areas in alternance each time the clean_d_cache macro is used.
 * Without this the XScale core exhibits cache eviction problems and no one
 * knows why.
 *
 * Reminder: the vector table is located at 0xffff0000-0xffff0fff.
 */
#define CLEAN_ADDR	0xfffe0000

/*
 * This macro is used to wait for a CP15 write and is needed
 * when we have to ensure that the last operation to the co-pro
 * was completed before continuing with operation.
 */
	.macro	cpwait, rd
	mrc	p15, 0, \rd, c2, c0, 0		@ arbitrary read of cp15
	mov	\rd, \rd			@ wait for completion
	sub 	pc, pc, #4			@ flush instruction pipeline
	.endm

	.macro	cpwait_ret, lr, rd
	mrc	p15, 0, \rd, c2, c0, 0		@ arbitrary read of cp15
	sub	pc, \lr, \rd, LSR #32		@ wait for completion and
						@ flush instruction pipeline
	.endm

/*
 * This macro cleans the entire dcache using line allocate.
 * The main loop has been unrolled to reduce loop overhead.
 * rd and rs are two scratch registers.
 */
	.macro  clean_d_cache, rd, rs
	ldr	\rs, =clean_addr
	ldr	\rd, [\rs]
	eor	\rd, \rd, #CACHESIZE
	str	\rd, [\rs]
	add	\rs, \rd, #CACHESIZE
1:	mcr	p15, 0, \rd, c7, c2, 5		@ allocate D cache line
	add	\rd, \rd, #CACHELINESIZE
	mcr	p15, 0, \rd, c7, c2, 5		@ allocate D cache line
	add	\rd, \rd, #CACHELINESIZE
	mcr	p15, 0, \rd, c7, c2, 5		@ allocate D cache line
	add	\rd, \rd, #CACHELINESIZE
	mcr	p15, 0, \rd, c7, c2, 5		@ allocate D cache line
	add	\rd, \rd, #CACHELINESIZE
	teq	\rd, \rs
	bne	1b
	.endm

	.data
clean_addr:	.word	CLEAN_ADDR

	.text

/*
 * cpu_xscale_proc_init()
 *
 * Nothing too exciting at the moment
 */
ENTRY(cpu_xscale_proc_init)
	@ enable write buffer coalescing. Some bootloader disable it
	mrc	p15, 0, r1, c1, c0, 1
	bic	r1, r1, #1
	mcr	p15, 0, r1, c1, c0, 1
	mov	pc, lr

/*
 * cpu_xscale_proc_fin()
 */
ENTRY(cpu_xscale_proc_fin)
	mrc	p15, 0, r0, c1, c0, 0		@ ctrl register
	bic	r0, r0, #0x1800			@ ...IZ...........
	bic	r0, r0, #0x0006			@ .............CA.
	mcr	p15, 0, r0, c1, c0, 0		@ disable caches
	mov	pc, lr

/*
 * cpu_xscale_reset(loc)
 *
 * Perform a soft reset of the system.  Put the CPU into the
 * same state as it would be if it had been reset, and branch
 * to what would be the reset vector.
 *
 * loc: location to jump to for soft reset
 *
 * Beware PXA270 erratum E7.
 */
	.align	5
	.pushsection	.idmap.text, "ax"
ENTRY(cpu_xscale_reset)
	mov	r1, #PSR_F_BIT|PSR_I_BIT|SVC_MODE
	msr	cpsr_c, r1			@ reset CPSR
	mcr	p15, 0, r1, c10, c4, 1		@ unlock I-TLB
	mcr	p15, 0, r1, c8, c5, 0		@ invalidate I-TLB
	mrc	p15, 0, r1, c1, c0, 0		@ ctrl register
	bic	r1, r1, #0x0086			@ ........B....CA.
	bic	r1, r1, #0x3900			@ ..VIZ..S........
	sub	pc, pc, #4			@ flush pipeline
	@ *** cache line aligned ***
	mcr	p15, 0, r1, c1, c0, 0		@ ctrl register
	bic	r1, r1, #0x0001			@ ...............M
	mcr	p15, 0, ip, c7, c7, 0		@ invalidate I,D caches & BTB
	mcr	p15, 0, r1, c1, c0, 0		@ ctrl register
	@ CAUTION: MMU turned off from this point. We count on the pipeline
	@ already containing those two last instructions to survive.
	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs
	mov	pc, r0
ENDPROC(cpu_xscale_reset)
	.popsection

/*
 * cpu_xscale_do_idle()
 *
 * Cause the processor to idle
 *
 * For now we do nothing but go to idle mode for every case
 *
 * XScale supports clock switching, but using idle mode support
 * allows external hardware to react to system state changes.
 */
	.align	5

ENTRY(cpu_xscale_do_idle)
	mov	r0, #1
	mcr	p14, 0, r0, c7, c0, 0		@ Go to IDLE
	mov	pc, lr

/* ================================= CACHE ================================ */

/*
 *	flush_icache_all()
 *
 *	Unconditionally clean and invalidate the entire icache.
 */
ENTRY(xscale_flush_icache_all)
	mov	r0, #0
	mcr	p15, 0, r0, c7, c5, 0		@ invalidate I cache
	mov	pc, lr
ENDPROC(xscale_flush_icache_all)

/*
 *	flush_user_cache_all()
 *
 *	Invalidate all cache entries in a particular address
 *	space.
 */
ENTRY(xscale_flush_user_cache_all)
	/* FALLTHROUGH */

/*
 *	flush_kern_cache_all()
 *
 *	Clean and invalidate the entire cache.
 */
ENTRY(xscale_flush_kern_cache_all)
	mov	r2, #VM_EXEC
	mov	ip, #0
__flush_whole_cache:
	clean_d_cache r0, r1
	tst	r2, #VM_EXEC
	mcrne	p15, 0, ip, c7, c5, 0		@ Invalidate I cache & BTB
	mcrne	p15, 0, ip, c7, c10, 4		@ Drain Write (& Fill) Buffer
	mov	pc, lr

/*
 *	flush_user_cache_range(start, end, vm_flags)
 *
 *	Invalidate a range of cache entries in the specified
 *	address space.
 *
 *	- start - start address (may not be aligned)
 *	- end	- end address (exclusive, may not be aligned)
 *	- vma	- vma_area_struct describing address space
 */
	.align	5
ENTRY(xscale_flush_user_cache_range)
	mov	ip, #0
	sub	r3, r1, r0			@ calculate total size
	cmp	r3, #MAX_AREA_SIZE
	bhs	__flush_whole_cache

1:	tst	r2, #VM_EXEC
	mcrne	p15, 0, r0, c7, c5, 1		@ Invalidate I cache line
	mcr	p15, 0, r0, c7, c10, 1		@ Clean D cache line
	mcr	p15, 0, r0, c7, c6, 1		@ Invalidate D cache line
	add	r0, r0, #CACHELINESIZE
	cmp	r0, r1
	blo	1b
	tst	r2, #VM_EXEC
	mcrne	p15, 0, ip, c7, c5, 6		@ Invalidate BTB
	mcrne	p15, 0, ip, c7, c10, 4		@ Drain Write (& Fill) Buffer
	mov	pc, lr

/*
 *	coherent_kern_range(start, end)
 *
 *	Ensure coherency between the Icache and the Dcache in the
 *	region described by start.  If you have non-snooping
 *	Harvard caches, you need to implement this function.
 *
 *	- start  - virtual start address
 *	- end	 - virtual end address
 *
 *	Note: single I-cache line invalidation isn't used here since
 *	it also trashes the mini I-cache used by JTAG debuggers.
 */
ENTRY(xscale_coherent_kern_range)
	bic	r0, r0, #CACHELINESIZE - 1
1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
	add	r0, r0, #CACHELINESIZE
	cmp	r0, r1
	blo	1b
	mov	r0, #0
	mcr	p15, 0, r0, c7, c5, 0		@ Invalidate I cache & BTB
	mcr	p15, 0, r0, c7, c10, 4		@ Drain Write (& Fill) Buffer
	mov	pc, lr

/*
 *	coherent_user_range(start, end)
 *
 *	Ensure coherency between the Icache and the Dcache in the
 *	region described by start.  If you have non-snooping
 *	Harvard caches, you need to implement this function.
 *
 *	- start  - virtual start address
 *	- end	 - virtual end address
 */
ENTRY(xscale_coherent_user_range)
	bic	r0, r0, #CACHELINESIZE - 1
1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
	mcr	p15, 0, r0, c7, c5, 1		@ Invalidate I cache entry
	add	r0, r0, #CACHELINESIZE
	cmp	r0, r1
	blo	1b
	mov	r0, #0
	mcr	p15, 0, r0, c7, c5, 6		@ Invalidate BTB
	mcr	p15, 0, r0, c7, c10, 4		@ Drain Write (& Fill) Buffer
	mov	pc, lr

/*
 *	flush_kern_dcache_area(void *addr, size_t size)
 *
 *	Ensure no D cache aliasing occurs, either with itself or
 *	the I cache
 *
 *	- addr	- kernel address
 *	- size	- region size
 */
ENTRY(xscale_flush_kern_dcache_area)
	add	r1, r0, r1
1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
	mcr	p15, 0, r0, c7, c6, 1		@ invalidate D entry
	add	r0, r0, #CACHELINESIZE
	cmp	r0, r1
	blo	1b
	mov	r0, #0
	mcr	p15, 0, r0, c7, c5, 0		@ Invalidate I cache & BTB
	mcr	p15, 0, r0, c7, c10, 4		@ Drain Write (& Fill) Buffer
	mov	pc, lr

/*
 *	dma_inv_range(start, end)
 *
 *	Invalidate (discard) the specified virtual address range.
 *	May not write back any entries.  If 'start' or 'end'
 *	are not cache line aligned, those lines must be written
 *	back.
 *
 *	- start  - virtual start address
 *	- end	 - virtual end address
 */
xscale_dma_inv_range:
	tst	r0, #CACHELINESIZE - 1
	bic	r0, r0, #CACHELINESIZE - 1
	mcrne	p15, 0, r0, c7, c10, 1		@ clean D entry
	tst	r1, #CACHELINESIZE - 1
	mcrne	p15, 0, r1, c7, c10, 1		@ clean D entry
1:	mcr	p15, 0, r0, c7, c6, 1		@ invalidate D entry
	add	r0, r0, #CACHELINESIZE
	cmp	r0, r1
	blo	1b
	mcr	p15, 0, r0, c7, c10, 4		@ Drain Write (& Fill) Buffer
	mov	pc, lr

/*
 *	dma_clean_range(start, end)
 *
 *	Clean the specified virtual address range.
 *
 *	- start  - virtual start address
 *	- end	 - virtual end address
 */
xscale_dma_clean_range:
	bic	r0, r0, #CACHELINESIZE - 1
1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
	add	r0, r0, #CACHELINESIZE
	cmp	r0, r1
	blo	1b
	mcr	p15, 0, r0, c7, c10, 4		@ Drain Write (& Fill) Buffer
	mov	pc, lr

/*
 *	dma_flush_range(start, end)
 *
 *	Clean and invalidate the specified virtual address range.
 *
 *	- start  - virtual start address
 *	- end	 - virtual end address
 */
ENTRY(xscale_dma_flush_range)
	bic	r0, r0, #CACHELINESIZE - 1
1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
	mcr	p15, 0, r0, c7, c6, 1		@ invalidate D entry
	add	r0, r0, #CACHELINESIZE
	cmp	r0, r1
	blo	1b
	mcr	p15, 0, r0, c7, c10, 4		@ Drain Write (& Fill) Buffer
	mov	pc, lr

/*
 *	dma_map_area(start, size, dir)
 *	- start	- kernel virtual start address
 *	- size	- size of region
 *	- dir	- DMA direction
 */
ENTRY(xscale_dma_map_area)
	add	r1, r1, r0
	cmp	r2, #DMA_TO_DEVICE
	beq	xscale_dma_clean_range
	bcs	xscale_dma_inv_range
	b	xscale_dma_flush_range
ENDPROC(xscale_dma_map_area)

/*
 *	dma_map_area(start, size, dir)
 *	- start	- kernel virtual start address
 *	- size	- size of region
 *	- dir	- DMA direction
 */
ENTRY(xscale_80200_A0_A1_dma_map_area)
	add	r1, r1, r0
	teq	r2, #DMA_TO_DEVICE
	beq	xscale_dma_clean_range
	b	xscale_dma_flush_range
ENDPROC(xscale_80200_A0_A1_dma_map_area)

/*
 *	dma_unmap_area(start, size, dir)
 *	- start	- kernel virtual start address
 *	- size	- size of region
 *	- dir	- DMA direction
 */
ENTRY(xscale_dma_unmap_area)
	mov	pc, lr
ENDPROC(xscale_dma_unmap_area)

	.globl	xscale_flush_kern_cache_louis
	.equ	xscale_flush_kern_cache_louis, xscale_flush_kern_cache_all

	@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
	define_cache_functions xscale

/*
 * On stepping A0/A1 of the 80200, invalidating D-cache by line doesn't
 * clear the dirty bits, which means that if we invalidate a dirty line,
 * the dirty data can still be written back to external memory later on.
 *
 * The recommended workaround is to always do a clean D-cache line before
 * doing an invalidate D-cache line, so on the affected processors,
 * dma_inv_range() is implemented as dma_flush_range().
 *
 * See erratum #25 of "Intel 80200 Processor Specification Update",
 * revision January 22, 2003, available at:
 *     http://www.intel.com/design/iio/specupdt/273415.htm
 */
.macro a0_alias basename
	.globl xscale_80200_A0_A1_\basename
	.type xscale_80200_A0_A1_\basename , %function
	.equ xscale_80200_A0_A1_\basename , xscale_\basename
.endm

/*
 * Most of the cache functions are unchanged for these processor revisions.
 * Export suitable alias symbols for the unchanged functions:
 */
	a0_alias flush_icache_all
	a0_alias flush_user_cache_all
	a0_alias flush_kern_cache_all
	a0_alias flush_kern_cache_louis
	a0_alias flush_user_cache_range
	a0_alias coherent_kern_range
	a0_alias coherent_user_range
	a0_alias flush_kern_dcache_area
	a0_alias dma_flush_range
	a0_alias dma_unmap_area

	@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
	define_cache_functions xscale_80200_A0_A1

ENTRY(cpu_xscale_dcache_clean_area)
1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
	add	r0, r0, #CACHELINESIZE
	subs	r1, r1, #CACHELINESIZE
	bhi	1b
	mov	pc, lr

/* =============================== PageTable ============================== */

/*
 * cpu_xscale_switch_mm(pgd)
 *
 * Set the translation base pointer to be as described by pgd.
 *
 * pgd: new page tables
 */
	.align	5
ENTRY(cpu_xscale_switch_mm)
	clean_d_cache r1, r2
	mcr	p15, 0, ip, c7, c5, 0		@ Invalidate I cache & BTB
	mcr	p15, 0, ip, c7, c10, 4		@ Drain Write (& Fill) Buffer
	mcr	p15, 0, r0, c2, c0, 0		@ load page table pointer
	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs
	cpwait_ret lr, ip

/*
 * cpu_xscale_set_pte_ext(ptep, pte, ext)
 *
 * Set a PTE and flush it out
 *
 * Errata 40: must set memory to write-through for user read-only pages.
 */
cpu_xscale_mt_table:
	.long	0x00						@ L_PTE_MT_UNCACHED
	.long	PTE_BUFFERABLE					@ L_PTE_MT_BUFFERABLE
	.long	PTE_CACHEABLE					@ L_PTE_MT_WRITETHROUGH
	.long	PTE_CACHEABLE | PTE_BUFFERABLE			@ L_PTE_MT_WRITEBACK
	.long	PTE_EXT_TEX(1) | PTE_BUFFERABLE			@ L_PTE_MT_DEV_SHARED
	.long	0x00						@ unused
	.long	PTE_EXT_TEX(1) | PTE_CACHEABLE			@ L_PTE_MT_MINICACHE
	.long	PTE_EXT_TEX(1) | PTE_CACHEABLE | PTE_BUFFERABLE	@ L_PTE_MT_WRITEALLOC
	.long	0x00						@ unused
	.long	PTE_BUFFERABLE					@ L_PTE_MT_DEV_WC
	.long	0x00						@ unused
	.long	PTE_CACHEABLE | PTE_BUFFERABLE			@ L_PTE_MT_DEV_CACHED
	.long	0x00						@ L_PTE_MT_DEV_NONSHARED
	.long	0x00						@ unused
	.long	0x00						@ unused
	.long	0x00						@ unused

	.align	5
ENTRY(cpu_xscale_set_pte_ext)
	xscale_set_pte_ext_prologue

	@
	@ Erratum 40: must set memory to write-through for user read-only pages
	@
	and	ip, r1, #(L_PTE_MT_MASK | L_PTE_USER | L_PTE_RDONLY) & ~(4 << 2)
	teq	ip, #L_PTE_MT_WRITEBACK | L_PTE_USER | L_PTE_RDONLY

	moveq	r1, #L_PTE_MT_WRITETHROUGH
	and	r1, r1, #L_PTE_MT_MASK
	adr	ip, cpu_xscale_mt_table
	ldr	ip, [ip, r1]
	bic	r2, r2, #0x0c
	orr	r2, r2, ip

	xscale_set_pte_ext_epilogue
	mov	pc, lr

	.ltorg
	.align

.globl	cpu_xscale_suspend_size
.equ	cpu_xscale_suspend_size, 4 * 6
#ifdef CONFIG_ARM_CPU_SUSPEND
ENTRY(cpu_xscale_do_suspend)
	stmfd	sp!, {r4 - r9, lr}
	mrc	p14, 0, r4, c6, c0, 0	@ clock configuration, for turbo mode
	mrc	p15, 0, r5, c15, c1, 0	@ CP access reg
	mrc	p15, 0, r6, c13, c0, 0	@ PID
	mrc	p15, 0, r7, c3, c0, 0	@ domain ID
	mrc	p15, 0, r8, c1, c0, 1	@ auxiliary control reg
	mrc	p15, 0, r9, c1, c0, 0	@ control reg
	bic	r4, r4, #2		@ clear frequency change bit
	stmia	r0, {r4 - r9}		@ store cp regs
	ldmfd	sp!, {r4 - r9, pc}
ENDPROC(cpu_xscale_do_suspend)

ENTRY(cpu_xscale_do_resume)
	ldmia	r0, {r4 - r9}		@ load cp regs
	mov	ip, #0
	mcr	p15, 0, ip, c8, c7, 0	@ invalidate I & D TLBs
	mcr	p15, 0, ip, c7, c7, 0	@ invalidate I & D caches, BTB
	mcr	p14, 0, r4, c6, c0, 0	@ clock configuration, turbo mode.
	mcr	p15, 0, r5, c15, c1, 0	@ CP access reg
	mcr	p15, 0, r6, c13, c0, 0	@ PID
	mcr	p15, 0, r7, c3, c0, 0	@ domain ID
	mcr	p15, 0, r1, c2, c0, 0	@ translation table base addr
	mcr	p15, 0, r8, c1, c0, 1	@ auxiliary control reg
	mov	r0, r9			@ control register
	b	cpu_resume_mmu
ENDPROC(cpu_xscale_do_resume)
#endif

	.type	__xscale_setup, #function
__xscale_setup:
	mcr	p15, 0, ip, c7, c7, 0		@ invalidate I, D caches & BTB
	mcr	p15, 0, ip, c7, c10, 4		@ Drain Write (& Fill) Buffer
	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I, D TLBs
	mov	r0, #1 << 6			@ cp6 for IOP3xx and Bulverde
	orr	r0, r0, #1 << 13		@ Its undefined whether this
	mcr	p15, 0, r0, c15, c1, 0		@ affects USR or SVC modes

	adr	r5, xscale_crval
	ldmia	r5, {r5, r6}
	mrc	p15, 0, r0, c1, c0, 0		@ get control register
	bic	r0, r0, r5
	orr	r0, r0, r6
	mov	pc, lr
	.size	__xscale_setup, . - __xscale_setup

	/*
	 *  R
	 * .RVI ZFRS BLDP WCAM
	 * ..11 1.01 .... .101
	 * 
	 */
	.type	xscale_crval, #object
xscale_crval:
	crval	clear=0x00003b07, mmuset=0x00003905, ucset=0x00001900

	__INITDATA

	@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
	define_processor_functions xscale, dabort=v5t_early_abort, pabort=legacy_pabort, suspend=1

	.section ".rodata"

	string	cpu_arch_name, "armv5te"
	string	cpu_elf_name, "v5"

	string	cpu_80200_A0_A1_name, "XScale-80200 A0/A1"
	string	cpu_80200_name, "XScale-80200"
	string	cpu_80219_name, "XScale-80219"
	string	cpu_8032x_name, "XScale-IOP8032x Family"
	string	cpu_8033x_name, "XScale-IOP8033x Family"
	string	cpu_pxa250_name, "XScale-PXA250"
	string	cpu_pxa210_name, "XScale-PXA210"
	string	cpu_ixp42x_name, "XScale-IXP42x Family"
	string	cpu_ixp43x_name, "XScale-IXP43x Family"
	string	cpu_ixp46x_name, "XScale-IXP46x Family"
	string	cpu_ixp2400_name, "XScale-IXP2400"
	string	cpu_ixp2800_name, "XScale-IXP2800"
	string	cpu_pxa255_name, "XScale-PXA255"
	string	cpu_pxa270_name, "XScale-PXA270"

	.align

	.section ".proc.info.init", #alloc, #execinstr

.macro xscale_proc_info name:req, cpu_val:req, cpu_mask:req, cpu_name:req, cache
	.type	__\name\()_proc_info,#object
__\name\()_proc_info:
	.long	\cpu_val
	.long	\cpu_mask
	.long	PMD_TYPE_SECT | \
		PMD_SECT_BUFFERABLE | \
		PMD_SECT_CACHEABLE | \
		PMD_SECT_AP_WRITE | \
		PMD_SECT_AP_READ
	.long	PMD_TYPE_SECT | \
		PMD_SECT_AP_WRITE | \
		PMD_SECT_AP_READ
	b	__xscale_setup
	.long	cpu_arch_name
	.long	cpu_elf_name
	.long	HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
	.long	\cpu_name
	.long	xscale_processor_functions
	.long	v4wbi_tlb_fns
	.long	xscale_mc_user_fns
	.ifb \cache
		.long	xscale_cache_fns
	.else
		.long	\cache
	.endif
	.size	__\name\()_proc_info, . - __\name\()_proc_info
.endm

	xscale_proc_info 80200_A0_A1, 0x69052000, 0xfffffffe, cpu_80200_name, \
		cache=xscale_80200_A0_A1_cache_fns
	xscale_proc_info 80200, 0x69052000, 0xfffffff0, cpu_80200_name
	xscale_proc_info 80219, 0x69052e20, 0xffffffe0, cpu_80219_name
	xscale_proc_info 8032x, 0x69052420, 0xfffff7e0, cpu_8032x_name
	xscale_proc_info 8033x, 0x69054010, 0xfffffd30, cpu_8033x_name
	xscale_proc_info pxa250, 0x69052100, 0xfffff7f0, cpu_pxa250_name
	xscale_proc_info pxa210, 0x69052120, 0xfffff3f0, cpu_pxa210_name
	xscale_proc_info ixp2400, 0x69054190, 0xfffffff0, cpu_ixp2400_name
	xscale_proc_info ixp2800, 0x690541a0, 0xfffffff0, cpu_ixp2800_name
	xscale_proc_info ixp42x, 0x690541c0, 0xffffffc0, cpu_ixp42x_name
	xscale_proc_info ixp43x, 0x69054040, 0xfffffff0, cpu_ixp43x_name
	xscale_proc_info ixp46x, 0x69054200, 0xffffff00, cpu_ixp46x_name
	xscale_proc_info pxa255, 0x69052d00, 0xfffffff0, cpu_pxa255_name
	xscale_proc_info pxa270, 0x69054110, 0xfffffff0, cpu_pxa270_name