1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * linux/arch/arm/mm/proc-xscale.S
5 * Author: Nicolas Pitre
6 * Created: November 2000
7 * Copyright: (C) 2000, 2001 MontaVista Software Inc.
9 * MMU functions for the Intel XScale CPUs
12 * some contributions by Brett Gaines <brett.w.gaines@intel.com>
13 * Copyright 2001 by Intel Corp.
16 * Completely revisited, many important fixes
17 * Nicolas Pitre <nico@fluxnic.net>
20 #include <linux/linkage.h>
21 #include <linux/init.h>
22 #include <linux/cfi_types.h>
23 #include <linux/pgtable.h>
24 #include <asm/assembler.h>
25 #include <asm/hwcap.h>
26 #include <asm/pgtable-hwdef.h>
28 #include <asm/ptrace.h>
29 #include "proc-macros.S"
32 * This is the maximum size of an area which will be flushed. If the area
33 * is larger than this, then we flush the whole cache
35 #define MAX_AREA_SIZE 32768
38 * the cache line size of the I and D cache
40 #define CACHELINESIZE 32
43 * the size of the data cache
45 #define CACHESIZE 32768
48 * Virtual address used to allocate the cache when flushed
50 * This must be an address range which is _never_ used. It should
51 * apparently have a mapping in the corresponding page table for
52 * compatibility with future CPUs that _could_ require it. For instance we
55 * This must be aligned on a 2*CACHESIZE boundary. The code selects one of
56 * the 2 areas in alternance each time the clean_d_cache macro is used.
57 * Without this the XScale core exhibits cache eviction problems and no one
60 * Reminder: the vector table is located at 0xffff0000-0xffff0fff.
62 #define CLEAN_ADDR 0xfffe0000
65 * This macro is used to wait for a CP15 write and is needed
66 * when we have to ensure that the last operation to the co-pro
67 * was completed before continuing with operation.
70 mrc p15, 0, \rd, c2, c0, 0 @ arbitrary read of cp15
71 mov \rd, \rd @ wait for completion
72 sub pc, pc, #4 @ flush instruction pipeline
75 .macro cpwait_ret, lr, rd
76 mrc p15, 0, \rd, c2, c0, 0 @ arbitrary read of cp15
77 sub pc, \lr, \rd, LSR #32 @ wait for completion and
78 @ flush instruction pipeline
82 * This macro cleans the entire dcache using line allocate.
83 * The main loop has been unrolled to reduce loop overhead.
84 * rd and rs are two scratch registers.
86 .macro clean_d_cache, rd, rs
89 eor \rd, \rd, #CACHESIZE
91 add \rs, \rd, #CACHESIZE
92 1: mcr p15, 0, \rd, c7, c2, 5 @ allocate D cache line
93 add \rd, \rd, #CACHELINESIZE
94 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
106 clean_addr: .word CLEAN_ADDR
111 * cpu_xscale_proc_init()
113 * Nothing too exciting at the moment
115 SYM_TYPED_FUNC_START(cpu_xscale_proc_init)
116 @ enable write buffer coalescing. Some bootloader disable it
117 mrc p15, 0, r1, c1, c0, 1
119 mcr p15, 0, r1, c1, c0, 1
121 SYM_FUNC_END(cpu_xscale_proc_init)
124 * cpu_xscale_proc_fin()
126 SYM_TYPED_FUNC_START(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
132 SYM_FUNC_END(cpu_xscale_proc_fin)
135 * cpu_xscale_reset(loc)
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.
141 * loc: location to jump to for soft reset
143 * Beware PXA270 erratum E7.
146 .pushsection .idmap.text, "ax"
147 SYM_TYPED_FUNC_START(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
165 SYM_FUNC_END(cpu_xscale_reset)
169 * cpu_xscale_do_idle()
171 * Cause the processor to idle
173 * For now we do nothing but go to idle mode for every case
175 * XScale supports clock switching, but using idle mode support
176 * allows external hardware to react to system state changes.
180 SYM_TYPED_FUNC_START(cpu_xscale_do_idle)
182 mcr p14, 0, r0, c7, c0, 0 @ Go to IDLE
184 SYM_FUNC_END(cpu_xscale_do_idle)
186 /* ================================= CACHE ================================ */
191 * Unconditionally clean and invalidate the entire icache.
193 SYM_TYPED_FUNC_START(xscale_flush_icache_all)
195 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
197 SYM_FUNC_END(xscale_flush_icache_all)
200 * flush_user_cache_all()
202 * Invalidate all cache entries in a particular address
205 SYM_FUNC_ALIAS(xscale_flush_user_cache_all, xscale_flush_kern_cache_all)
208 * flush_kern_cache_all()
210 * Clean and invalidate the entire cache.
212 SYM_TYPED_FUNC_START(xscale_flush_kern_cache_all)
218 mcrne p15, 0, ip, c7, c5, 0 @ Invalidate I cache & BTB
219 mcrne p15, 0, ip, c7, c10, 4 @ Drain Write (& Fill) Buffer
221 SYM_FUNC_END(xscale_flush_kern_cache_all)
224 * flush_user_cache_range(start, end, vm_flags)
226 * Invalidate a range of cache entries in the specified
229 * - start - start address (may not be aligned)
230 * - end - end address (exclusive, may not be aligned)
231 * - vma - vma_area_struct describing address space
234 SYM_TYPED_FUNC_START(xscale_flush_user_cache_range)
236 sub r3, r1, r0 @ calculate total size
237 cmp r3, #MAX_AREA_SIZE
238 bhs __flush_whole_cache
241 mcrne p15, 0, r0, c7, c5, 1 @ Invalidate I cache line
242 mcr p15, 0, r0, c7, c10, 1 @ Clean D cache line
243 mcr p15, 0, r0, c7, c6, 1 @ Invalidate D cache line
244 add r0, r0, #CACHELINESIZE
248 mcrne p15, 0, ip, c7, c5, 6 @ Invalidate BTB
249 mcrne p15, 0, ip, c7, c10, 4 @ Drain Write (& Fill) Buffer
251 SYM_FUNC_END(xscale_flush_user_cache_range)
254 * coherent_kern_range(start, end)
256 * Ensure coherency between the Icache and the Dcache in the
257 * region described by start. If you have non-snooping
258 * Harvard caches, you need to implement this function.
260 * - start - virtual start address
261 * - end - virtual end address
263 * Note: single I-cache line invalidation isn't used here since
264 * it also trashes the mini I-cache used by JTAG debuggers.
266 SYM_TYPED_FUNC_START(xscale_coherent_kern_range)
267 bic r0, r0, #CACHELINESIZE - 1
268 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
269 add r0, r0, #CACHELINESIZE
273 mcr p15, 0, r0, c7, c5, 0 @ Invalidate I cache & BTB
274 mcr p15, 0, r0, c7, c10, 4 @ Drain Write (& Fill) Buffer
276 SYM_FUNC_END(xscale_coherent_kern_range)
279 * coherent_user_range(start, end)
281 * Ensure coherency between the Icache and the Dcache in the
282 * region described by start. If you have non-snooping
283 * Harvard caches, you need to implement this function.
285 * - start - virtual start address
286 * - end - virtual end address
288 SYM_TYPED_FUNC_START(xscale_coherent_user_range)
289 bic r0, r0, #CACHELINESIZE - 1
290 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
291 mcr p15, 0, r0, c7, c5, 1 @ Invalidate I cache entry
292 add r0, r0, #CACHELINESIZE
296 mcr p15, 0, r0, c7, c5, 6 @ Invalidate BTB
297 mcr p15, 0, r0, c7, c10, 4 @ Drain Write (& Fill) Buffer
299 SYM_FUNC_END(xscale_coherent_user_range)
302 * flush_kern_dcache_area(void *addr, size_t size)
304 * Ensure no D cache aliasing occurs, either with itself or
307 * - addr - kernel address
308 * - size - region size
310 SYM_TYPED_FUNC_START(xscale_flush_kern_dcache_area)
312 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
313 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
314 add r0, r0, #CACHELINESIZE
318 mcr p15, 0, r0, c7, c5, 0 @ Invalidate I cache & BTB
319 mcr p15, 0, r0, c7, c10, 4 @ Drain Write (& Fill) Buffer
321 SYM_FUNC_END(xscale_flush_kern_dcache_area)
324 * dma_inv_range(start, end)
326 * Invalidate (discard) the specified virtual address range.
327 * May not write back any entries. If 'start' or 'end'
328 * are not cache line aligned, those lines must be written
331 * - start - virtual start address
332 * - end - virtual end address
334 xscale_dma_inv_range:
335 tst r0, #CACHELINESIZE - 1
336 bic r0, r0, #CACHELINESIZE - 1
337 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
338 tst r1, #CACHELINESIZE - 1
339 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
340 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
341 add r0, r0, #CACHELINESIZE
344 mcr p15, 0, r0, c7, c10, 4 @ Drain Write (& Fill) Buffer
348 * dma_clean_range(start, end)
350 * Clean the specified virtual address range.
352 * - start - virtual start address
353 * - end - virtual end address
355 xscale_dma_clean_range:
356 bic r0, r0, #CACHELINESIZE - 1
357 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
358 add r0, r0, #CACHELINESIZE
361 mcr p15, 0, r0, c7, c10, 4 @ Drain Write (& Fill) Buffer
365 * dma_flush_range(start, end)
367 * Clean and invalidate the specified virtual address range.
369 * - start - virtual start address
370 * - end - virtual end address
372 SYM_TYPED_FUNC_START(xscale_dma_flush_range)
373 bic r0, r0, #CACHELINESIZE - 1
374 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
375 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
376 add r0, r0, #CACHELINESIZE
379 mcr p15, 0, r0, c7, c10, 4 @ Drain Write (& Fill) Buffer
381 SYM_FUNC_END(xscale_dma_flush_range)
384 * dma_map_area(start, size, dir)
385 * - start - kernel virtual start address
386 * - size - size of region
387 * - dir - DMA direction
389 SYM_TYPED_FUNC_START(xscale_dma_map_area)
391 cmp r2, #DMA_TO_DEVICE
392 beq xscale_dma_clean_range
393 bcs xscale_dma_inv_range
394 b xscale_dma_flush_range
395 SYM_FUNC_END(xscale_dma_map_area)
398 * On stepping A0/A1 of the 80200, invalidating D-cache by line doesn't
399 * clear the dirty bits, which means that if we invalidate a dirty line,
400 * the dirty data can still be written back to external memory later on.
402 * The recommended workaround is to always do a clean D-cache line before
403 * doing an invalidate D-cache line, so on the affected processors,
404 * dma_inv_range() is implemented as dma_flush_range().
406 * See erratum #25 of "Intel 80200 Processor Specification Update",
407 * revision January 22, 2003, available at:
408 * http://www.intel.com/design/iio/specupdt/273415.htm
412 * dma_map_area(start, size, dir)
413 * - start - kernel virtual start address
414 * - size - size of region
415 * - dir - DMA direction
417 SYM_TYPED_FUNC_START(xscale_80200_A0_A1_dma_map_area)
419 teq r2, #DMA_TO_DEVICE
420 beq xscale_dma_clean_range
421 b xscale_dma_flush_range
422 SYM_FUNC_END(xscale_80200_A0_A1_dma_map_area)
425 * dma_unmap_area(start, size, dir)
426 * - start - kernel virtual start address
427 * - size - size of region
428 * - dir - DMA direction
430 SYM_TYPED_FUNC_START(xscale_dma_unmap_area)
432 SYM_FUNC_END(xscale_dma_unmap_area)
434 SYM_TYPED_FUNC_START(cpu_xscale_dcache_clean_area)
435 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
436 add r0, r0, #CACHELINESIZE
437 subs r1, r1, #CACHELINESIZE
440 SYM_FUNC_END(cpu_xscale_dcache_clean_area)
442 /* =============================== PageTable ============================== */
445 * cpu_xscale_switch_mm(pgd)
447 * Set the translation base pointer to be as described by pgd.
449 * pgd: new page tables
452 SYM_TYPED_FUNC_START(cpu_xscale_switch_mm)
454 mcr p15, 0, ip, c7, c5, 0 @ Invalidate I cache & BTB
455 mcr p15, 0, ip, c7, c10, 4 @ Drain Write (& Fill) Buffer
456 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
457 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
459 SYM_FUNC_END(cpu_xscale_switch_mm)
462 * cpu_xscale_set_pte_ext(ptep, pte, ext)
464 * Set a PTE and flush it out
466 * Errata 40: must set memory to write-through for user read-only pages.
469 .long 0x00 @ L_PTE_MT_UNCACHED
470 .long PTE_BUFFERABLE @ L_PTE_MT_BUFFERABLE
471 .long PTE_CACHEABLE @ L_PTE_MT_WRITETHROUGH
472 .long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEBACK
473 .long PTE_EXT_TEX(1) | PTE_BUFFERABLE @ L_PTE_MT_DEV_SHARED
475 .long PTE_EXT_TEX(1) | PTE_CACHEABLE @ L_PTE_MT_MINICACHE
476 .long PTE_EXT_TEX(1) | PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEALLOC
478 .long PTE_BUFFERABLE @ L_PTE_MT_DEV_WC
480 .long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_DEV_CACHED
481 .long 0x00 @ L_PTE_MT_DEV_NONSHARED
487 SYM_TYPED_FUNC_START(cpu_xscale_set_pte_ext)
488 xscale_set_pte_ext_prologue
491 @ Erratum 40: must set memory to write-through for user read-only pages
493 and ip, r1, #(L_PTE_MT_MASK | L_PTE_USER | L_PTE_RDONLY) & ~(4 << 2)
494 teq ip, #L_PTE_MT_WRITEBACK | L_PTE_USER | L_PTE_RDONLY
496 moveq r1, #L_PTE_MT_WRITETHROUGH
497 and r1, r1, #L_PTE_MT_MASK
498 adr ip, cpu_xscale_mt_table
503 xscale_set_pte_ext_epilogue
505 SYM_FUNC_END(cpu_xscale_set_pte_ext)
510 .globl cpu_xscale_suspend_size
511 .equ cpu_xscale_suspend_size, 4 * 6
512 #ifdef CONFIG_ARM_CPU_SUSPEND
513 SYM_TYPED_FUNC_START(cpu_xscale_do_suspend)
514 stmfd sp!, {r4 - r9, lr}
515 mrc p14, 0, r4, c6, c0, 0 @ clock configuration, for turbo mode
516 mrc p15, 0, r5, c15, c1, 0 @ CP access reg
517 mrc p15, 0, r6, c13, c0, 0 @ PID
518 mrc p15, 0, r7, c3, c0, 0 @ domain ID
519 mrc p15, 0, r8, c1, c0, 1 @ auxiliary control reg
520 mrc p15, 0, r9, c1, c0, 0 @ control reg
521 bic r4, r4, #2 @ clear frequency change bit
522 stmia r0, {r4 - r9} @ store cp regs
523 ldmfd sp!, {r4 - r9, pc}
524 SYM_FUNC_END(cpu_xscale_do_suspend)
526 SYM_TYPED_FUNC_START(cpu_xscale_do_resume)
527 ldmia r0, {r4 - r9} @ load cp regs
529 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
530 mcr p15, 0, ip, c7, c7, 0 @ invalidate I & D caches, BTB
531 mcr p14, 0, r4, c6, c0, 0 @ clock configuration, turbo mode.
532 mcr p15, 0, r5, c15, c1, 0 @ CP access reg
533 mcr p15, 0, r6, c13, c0, 0 @ PID
534 mcr p15, 0, r7, c3, c0, 0 @ domain ID
535 mcr p15, 0, r1, c2, c0, 0 @ translation table base addr
536 mcr p15, 0, r8, c1, c0, 1 @ auxiliary control reg
537 mov r0, r9 @ control register
539 SYM_FUNC_END(cpu_xscale_do_resume)
542 .type __xscale_setup, #function
544 mcr p15, 0, ip, c7, c7, 0 @ invalidate I, D caches & BTB
545 mcr p15, 0, ip, c7, c10, 4 @ Drain Write (& Fill) Buffer
546 mcr p15, 0, ip, c8, c7, 0 @ invalidate I, D TLBs
547 mov r0, #1 << 6 @ cp6 for IOP3xx and Bulverde
548 orr r0, r0, #1 << 13 @ Its undefined whether this
549 mcr p15, 0, r0, c15, c1, 0 @ affects USR or SVC modes
553 mrc p15, 0, r0, c1, c0, 0 @ get control register
557 .size __xscale_setup, . - __xscale_setup
561 * .RVI ZFRS BLDP WCAM
562 * ..11 1.01 .... .101
565 .type xscale_crval, #object
567 crval clear=0x00003b07, mmuset=0x00003905, ucset=0x00001900
571 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
572 define_processor_functions xscale, dabort=v5t_early_abort, pabort=legacy_pabort, suspend=1
576 string cpu_arch_name, "armv5te"
577 string cpu_elf_name, "v5"
579 string cpu_80200_A0_A1_name, "XScale-80200 A0/A1"
580 string cpu_80200_name, "XScale-80200"
581 string cpu_80219_name, "XScale-80219"
582 string cpu_8032x_name, "XScale-IOP8032x Family"
583 string cpu_8033x_name, "XScale-IOP8033x Family"
584 string cpu_pxa250_name, "XScale-PXA250"
585 string cpu_pxa210_name, "XScale-PXA210"
586 string cpu_ixp42x_name, "XScale-IXP42x Family"
587 string cpu_ixp43x_name, "XScale-IXP43x Family"
588 string cpu_ixp46x_name, "XScale-IXP46x Family"
589 string cpu_ixp2400_name, "XScale-IXP2400"
590 string cpu_ixp2800_name, "XScale-IXP2800"
591 string cpu_pxa255_name, "XScale-PXA255"
592 string cpu_pxa270_name, "XScale-PXA270"
596 .section ".proc.info.init", "a"
598 .macro xscale_proc_info name:req, cpu_val:req, cpu_mask:req, cpu_name:req, cache
599 .type __\name\()_proc_info,#object
600 __\name\()_proc_info:
603 .long PMD_TYPE_SECT | \
604 PMD_SECT_BUFFERABLE | \
605 PMD_SECT_CACHEABLE | \
606 PMD_SECT_AP_WRITE | \
608 .long PMD_TYPE_SECT | \
609 PMD_SECT_AP_WRITE | \
611 initfn __xscale_setup, __\name\()_proc_info
614 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
616 .long xscale_processor_functions
618 .long xscale_mc_user_fns
620 .long xscale_cache_fns
624 .size __\name\()_proc_info, . - __\name\()_proc_info
627 xscale_proc_info 80200_A0_A1, 0x69052000, 0xfffffffe, cpu_80200_name, \
628 cache=xscale_80200_A0_A1_cache_fns
629 xscale_proc_info 80200, 0x69052000, 0xfffffff0, cpu_80200_name
630 xscale_proc_info 80219, 0x69052e20, 0xffffffe0, cpu_80219_name
631 xscale_proc_info 8032x, 0x69052420, 0xfffff7e0, cpu_8032x_name
632 xscale_proc_info 8033x, 0x69054010, 0xfffffd30, cpu_8033x_name
633 xscale_proc_info pxa250, 0x69052100, 0xfffff7f0, cpu_pxa250_name
634 xscale_proc_info pxa210, 0x69052120, 0xfffff3f0, cpu_pxa210_name
635 xscale_proc_info ixp2400, 0x69054190, 0xfffffff0, cpu_ixp2400_name
636 xscale_proc_info ixp2800, 0x690541a0, 0xfffffff0, cpu_ixp2800_name
637 xscale_proc_info ixp42x, 0x690541c0, 0xffffffc0, cpu_ixp42x_name
638 xscale_proc_info ixp43x, 0x69054040, 0xfffffff0, cpu_ixp43x_name
639 xscale_proc_info ixp46x, 0x69054200, 0xffffff00, cpu_ixp46x_name
640 xscale_proc_info pxa255, 0x69052d00, 0xfffffff0, cpu_pxa255_name
641 xscale_proc_info pxa270, 0x69054110, 0xfffffff0, cpu_pxa270_name