2 * linux/arch/arm/mm/proc-xsc3.S
4 * Original Author: Matthew Gilbert
5 * Current Maintainer: Lennert Buytenhek <buytenh@wantstofly.org>
7 * Copyright 2004 (C) Intel Corp.
8 * Copyright 2005 (C) MontaVista Software, Inc.
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
14 * MMU functions for the Intel XScale3 Core (XSC3). The XSC3 core is
15 * an extension to Intel's original XScale core that adds the following
18 * - ARMv6 Supersections
19 * - Low Locality Reference pages (replaces mini-cache)
22 * - Cache coherency if chipset supports it
24 * Based on original XScale code by Nicolas Pitre.
27 #include <linux/linkage.h>
28 #include <linux/init.h>
29 #include <asm/assembler.h>
31 #include <asm/hardware.h>
32 #include <asm/pgtable.h>
33 #include <asm/pgtable-hwdef.h>
35 #include <asm/ptrace.h>
36 #include "proc-macros.S"
39 * This is the maximum size of an area which will be flushed. If the
40 * area is larger than this, then we flush the whole cache.
42 #define MAX_AREA_SIZE 32768
45 * The cache line size of the L1 I, L1 D and unified L2 cache.
47 #define CACHELINESIZE 32
50 * The size of the L1 D cache.
52 #define CACHESIZE 32768
55 * Run with L2 enabled.
57 #define L2_CACHE_ENABLE 1
60 * This macro is used to wait for a CP15 write and is needed when we
61 * have to ensure that the last operation to the coprocessor was
62 * completed before continuing with operation.
64 .macro cpwait_ret, lr, rd
65 mrc p15, 0, \rd, c2, c0, 0 @ arbitrary read of cp15
66 sub pc, \lr, \rd, LSR #32 @ wait for completion and
67 @ flush instruction pipeline
71 * This macro cleans and invalidates the entire L1 D cache.
74 .macro clean_d_cache rd, rs
77 1: mcr p15, 0, \rd, c7, c14, 2 @ clean/invalidate L1 D line
78 adds \rd, \rd, #0x40000000
87 * cpu_xsc3_proc_init()
89 * Nothing too exciting at the moment
91 ENTRY(cpu_xsc3_proc_init)
97 ENTRY(cpu_xsc3_proc_fin)
99 mov r0, #PSR_F_BIT|PSR_I_BIT|SVC_MODE
101 bl xsc3_flush_kern_cache_all @ clean caches
102 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
103 bic r0, r0, #0x1800 @ ...IZ...........
104 bic r0, r0, #0x0006 @ .............CA.
105 mcr p15, 0, r0, c1, c0, 0 @ disable caches
109 * cpu_xsc3_reset(loc)
111 * Perform a soft reset of the system. Put the CPU into the
112 * same state as it would be if it had been reset, and branch
113 * to what would be the reset vector.
115 * loc: location to jump to for soft reset
118 ENTRY(cpu_xsc3_reset)
119 mov r1, #PSR_F_BIT|PSR_I_BIT|SVC_MODE
120 msr cpsr_c, r1 @ reset CPSR
121 mrc p15, 0, r1, c1, c0, 0 @ ctrl register
122 bic r1, r1, #0x3900 @ ..VIZ..S........
123 bic r1, r1, #0x0086 @ ........B....CA.
124 mcr p15, 0, r1, c1, c0, 0 @ ctrl register
125 mcr p15, 0, ip, c7, c7, 0 @ invalidate L1 caches and BTB
126 bic r1, r1, #0x0001 @ ...............M
127 mcr p15, 0, r1, c1, c0, 0 @ ctrl register
128 @ CAUTION: MMU turned off from this point. We count on the pipeline
129 @ already containing those two last instructions to survive.
130 mcr p15, 0, ip, c8, c7, 0 @ invalidate I and D TLBs
136 * Cause the processor to idle
138 * For now we do nothing but go to idle mode for every case
140 * XScale supports clock switching, but using idle mode support
141 * allows external hardware to react to system state changes.
145 ENTRY(cpu_xsc3_do_idle)
147 mcr p14, 0, r0, c7, c0, 0 @ go to idle
150 /* ================================= CACHE ================================ */
153 * flush_user_cache_all()
155 * Invalidate all cache entries in a particular address
158 ENTRY(xsc3_flush_user_cache_all)
162 * flush_kern_cache_all()
164 * Clean and invalidate the entire cache.
166 ENTRY(xsc3_flush_kern_cache_all)
172 mcrne p15, 0, ip, c7, c5, 0 @ invalidate L1 I cache and BTB
173 mcrne p15, 0, ip, c7, c10, 4 @ data write barrier
174 mcrne p15, 0, ip, c7, c5, 4 @ prefetch flush
178 * flush_user_cache_range(start, end, vm_flags)
180 * Invalidate a range of cache entries in the specified
183 * - start - start address (may not be aligned)
184 * - end - end address (exclusive, may not be aligned)
185 * - vma - vma_area_struct describing address space
188 ENTRY(xsc3_flush_user_cache_range)
190 sub r3, r1, r0 @ calculate total size
191 cmp r3, #MAX_AREA_SIZE
192 bhs __flush_whole_cache
195 mcrne p15, 0, r0, c7, c5, 1 @ invalidate L1 I line
196 mcr p15, 0, r0, c7, c14, 1 @ clean/invalidate L1 D line
197 add r0, r0, #CACHELINESIZE
201 mcrne p15, 0, ip, c7, c5, 6 @ invalidate BTB
202 mcrne p15, 0, ip, c7, c10, 4 @ data write barrier
203 mcrne p15, 0, ip, c7, c5, 4 @ prefetch flush
207 * coherent_kern_range(start, end)
209 * Ensure coherency between the I cache and the D cache in the
210 * region described by start. If you have non-snooping
211 * Harvard caches, you need to implement this function.
213 * - start - virtual start address
214 * - end - virtual end address
216 * Note: single I-cache line invalidation isn't used here since
217 * it also trashes the mini I-cache used by JTAG debuggers.
219 ENTRY(xsc3_coherent_kern_range)
221 ENTRY(xsc3_coherent_user_range)
222 bic r0, r0, #CACHELINESIZE - 1
223 1: mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line
224 add r0, r0, #CACHELINESIZE
228 mcr p15, 0, r0, c7, c5, 0 @ invalidate L1 I cache and BTB
229 mcr p15, 0, r0, c7, c10, 4 @ data write barrier
230 mcr p15, 0, r0, c7, c5, 4 @ prefetch flush
234 * flush_kern_dcache_page(void *page)
236 * Ensure no D cache aliasing occurs, either with itself or
239 * - addr - page aligned address
241 ENTRY(xsc3_flush_kern_dcache_page)
243 1: mcr p15, 0, r0, c7, c14, 1 @ clean/invalidate L1 D line
244 add r0, r0, #CACHELINESIZE
248 mcr p15, 0, r0, c7, c5, 0 @ invalidate L1 I cache and BTB
249 mcr p15, 0, r0, c7, c10, 4 @ data write barrier
250 mcr p15, 0, r0, c7, c5, 4 @ prefetch flush
254 * dma_inv_range(start, end)
256 * Invalidate (discard) the specified virtual address range.
257 * May not write back any entries. If 'start' or 'end'
258 * are not cache line aligned, those lines must be written
261 * - start - virtual start address
262 * - end - virtual end address
264 ENTRY(xsc3_dma_inv_range)
265 tst r0, #CACHELINESIZE - 1
266 bic r0, r0, #CACHELINESIZE - 1
267 mcrne p15, 0, r0, c7, c10, 1 @ clean L1 D line
268 mcrne p15, 1, r0, c7, c11, 1 @ clean L2 line
269 tst r1, #CACHELINESIZE - 1
270 mcrne p15, 0, r1, c7, c10, 1 @ clean L1 D line
271 mcrne p15, 1, r1, c7, c11, 1 @ clean L2 line
272 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate L1 D line
273 mcr p15, 1, r0, c7, c7, 1 @ invalidate L2 line
274 add r0, r0, #CACHELINESIZE
277 mcr p15, 0, r0, c7, c10, 4 @ data write barrier
281 * dma_clean_range(start, end)
283 * Clean the specified virtual address range.
285 * - start - virtual start address
286 * - end - virtual end address
288 ENTRY(xsc3_dma_clean_range)
289 bic r0, r0, #CACHELINESIZE - 1
290 1: mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line
291 mcr p15, 1, r0, c7, c11, 1 @ clean L2 line
292 add r0, r0, #CACHELINESIZE
295 mcr p15, 0, r0, c7, c10, 4 @ data write barrier
299 * dma_flush_range(start, end)
301 * Clean and invalidate the specified virtual address range.
303 * - start - virtual start address
304 * - end - virtual end address
306 ENTRY(xsc3_dma_flush_range)
307 bic r0, r0, #CACHELINESIZE - 1
308 1: mcr p15, 0, r0, c7, c14, 1 @ clean/invalidate L1 D line
309 mcr p15, 1, r0, c7, c11, 1 @ clean L2 line
310 mcr p15, 1, r0, c7, c7, 1 @ invalidate L2 line
311 add r0, r0, #CACHELINESIZE
314 mcr p15, 0, r0, c7, c10, 4 @ data write barrier
317 ENTRY(xsc3_cache_fns)
318 .long xsc3_flush_kern_cache_all
319 .long xsc3_flush_user_cache_all
320 .long xsc3_flush_user_cache_range
321 .long xsc3_coherent_kern_range
322 .long xsc3_coherent_user_range
323 .long xsc3_flush_kern_dcache_page
324 .long xsc3_dma_inv_range
325 .long xsc3_dma_clean_range
326 .long xsc3_dma_flush_range
328 ENTRY(cpu_xsc3_dcache_clean_area)
329 1: mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line
330 add r0, r0, #CACHELINESIZE
331 subs r1, r1, #CACHELINESIZE
335 /* =============================== PageTable ============================== */
338 * cpu_xsc3_switch_mm(pgd)
340 * Set the translation base pointer to be as described by pgd.
342 * pgd: new page tables
345 ENTRY(cpu_xsc3_switch_mm)
347 mcr p15, 0, ip, c7, c5, 0 @ invalidate L1 I cache and BTB
348 mcr p15, 0, ip, c7, c10, 4 @ data write barrier
349 mcr p15, 0, ip, c7, c5, 4 @ prefetch flush
350 #ifdef L2_CACHE_ENABLE
351 orr r0, r0, #0x18 @ cache the page table in L2
353 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
354 mcr p15, 0, ip, c8, c7, 0 @ invalidate I and D TLBs
358 * cpu_xsc3_set_pte_ext(ptep, pte, ext)
360 * Set a PTE and flush it out
364 ENTRY(cpu_xsc3_set_pte_ext)
365 str r1, [r0], #-2048 @ linux version
367 bic r2, r1, #0xff0 @ keep C, B bits
368 orr r2, r2, #PTE_TYPE_EXT @ extended page
369 tst r1, #L_PTE_SHARED @ shared?
372 eor r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
374 tst r3, #L_PTE_USER @ user?
375 orrne r2, r2, #PTE_EXT_AP_URO_SRW @ yes -> user r/o, system r/w
377 tst r3, #L_PTE_WRITE | L_PTE_DIRTY @ write and dirty?
378 orreq r2, r2, #PTE_EXT_AP_UNO_SRW @ yes -> user n/a, system r/w
379 @ combined with user -> user r/w
382 @ If it's cacheable, it needs to be in L2 also.
383 eor ip, r1, #L_PTE_CACHEABLE
384 tst ip, #L_PTE_CACHEABLE
385 orreq r2, r2, #PTE_EXT_TEX(0x5)
388 tst r3, #L_PTE_PRESENT | L_PTE_YOUNG @ present and young?
389 movne r2, #0 @ no -> fault
391 str r2, [r0] @ hardware version
393 mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line
394 mcr p15, 0, ip, c7, c10, 4 @ data write barrier
403 .type __xsc3_setup, #function
405 mov r0, #PSR_F_BIT|PSR_I_BIT|SVC_MODE
407 mcr p15, 0, ip, c7, c7, 0 @ invalidate L1 caches and BTB
408 mcr p15, 0, ip, c7, c10, 4 @ data write barrier
409 mcr p15, 0, ip, c7, c5, 4 @ prefetch flush
410 mcr p15, 0, ip, c8, c7, 0 @ invalidate I and D TLBs
412 orr r4, r4, #0x18 @ cache the page table in L2
414 mcr p15, 0, r4, c2, c0, 0 @ load page table pointer
416 mov r0, #0 @ don't allow CP access
417 mcr p15, 0, r0, c15, c1, 0 @ write CP access register
419 mrc p15, 0, r0, c1, c0, 1 @ get auxiliary control reg
420 and r0, r0, #2 @ preserve bit P bit setting
422 orr r0, r0, #(1 << 10) @ enable L2 for LLR cache
424 mcr p15, 0, r0, c1, c0, 1 @ set auxiliary control reg
428 mrc p15, 0, r0, c1, c0, 0 @ get control register
429 bic r0, r0, r5 @ ..V. ..R. .... ..A.
430 orr r0, r0, r6 @ ..VI Z..S .... .C.M (mmu)
431 @ ...I Z..S .... .... (uc)
433 orr r0, r0, #0x04000000 @ L2 enable
437 .size __xsc3_setup, . - __xsc3_setup
439 .type xsc3_crval, #object
441 crval clear=0x04002202, mmuset=0x00003905, ucset=0x00001900
446 * Purpose : Function pointers used to access above functions - all calls
450 .type xsc3_processor_functions, #object
451 ENTRY(xsc3_processor_functions)
452 .word v5t_early_abort
454 .word cpu_xsc3_proc_init
455 .word cpu_xsc3_proc_fin
457 .word cpu_xsc3_do_idle
458 .word cpu_xsc3_dcache_clean_area
459 .word cpu_xsc3_switch_mm
460 .word cpu_xsc3_set_pte_ext
461 .size xsc3_processor_functions, . - xsc3_processor_functions
465 .type cpu_arch_name, #object
468 .size cpu_arch_name, . - cpu_arch_name
470 .type cpu_elf_name, #object
473 .size cpu_elf_name, . - cpu_elf_name
475 .type cpu_xsc3_name, #object
477 .asciz "XScale-V3 based processor"
478 .size cpu_xsc3_name, . - cpu_xsc3_name
482 .section ".proc.info.init", #alloc, #execinstr
484 .type __xsc3_proc_info,#object
488 .long PMD_TYPE_SECT | \
489 PMD_SECT_BUFFERABLE | \
490 PMD_SECT_CACHEABLE | \
491 PMD_SECT_AP_WRITE | \
493 .long PMD_TYPE_SECT | \
494 PMD_SECT_AP_WRITE | \
499 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
501 .long xsc3_processor_functions
503 .long xsc3_mc_user_fns
505 .size __xsc3_proc_info, . - __xsc3_proc_info