| blob | a17afe7e195acd0f7156116f3867ed1d99e8daf6 |
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * linux/arch/arm/mm/proc-xsc3.S
4 *
5 * Original Author: Matthew Gilbert
6 * Current Maintainer: Lennert Buytenhek <buytenh@wantstofly.org>
7 *
8 * Copyright 2004 (C) Intel Corp.
9 * Copyright 2005 (C) MontaVista Software, Inc.
10 *
11 * MMU functions for the Intel XScale3 Core (XSC3). The XSC3 core is
12 * an extension to Intel's original XScale core that adds the following
13 * features:
14 *
15 * - ARMv6 Supersections
16 * - Low Locality Reference pages (replaces mini-cache)
17 * - 36-bit addressing
18 * - L2 cache
19 * - Cache coherency if chipset supports it
20 *
21 * Based on original XScale code by Nicolas Pitre.
22 */
24 #include <linux/linkage.h>
25 #include <linux/init.h>
26 #include <linux/pgtable.h>
27 #include <asm/assembler.h>
28 #include <asm/hwcap.h>
29 #include <asm/pgtable-hwdef.h>
30 #include <asm/page.h>
31 #include <asm/ptrace.h>
32 #include "proc-macros.S"
34 /*
35 * This is the maximum size of an area which will be flushed. If the
36 * area is larger than this, then we flush the whole cache.
37 */
38 #define MAX_AREA_SIZE 32768
40 /*
41 * The cache line size of the L1 I, L1 D and unified L2 cache.
42 */
43 #define CACHELINESIZE 32
45 /*
46 * The size of the L1 D cache.
47 */
48 #define CACHESIZE 32768
50 /*
51 * This macro is used to wait for a CP15 write and is needed when we
52 * have to ensure that the last operation to the coprocessor was
53 * completed before continuing with operation.
54 */
55 .macro cpwait_ret, lr, rd
56 mrc p15, 0, \rd, c2, c0, 0 @ arbitrary read of cp15
57 sub pc, \lr, \rd, LSR #32 @ wait for completion and
58 @ flush instruction pipeline
59 .endm
61 /*
62 * This macro cleans and invalidates the entire L1 D cache.
63 */
65 .macro clean_d_cache rd, rs
66 mov \rd, #0x1f00
67 orr \rd, \rd, #0x00e0
68 1: mcr p15, 0, \rd, c7, c14, 2 @ clean/invalidate L1 D line
69 adds \rd, \rd, #0x40000000
70 bcc 1b
71 subs \rd, \rd, #0x20
72 bpl 1b
73 .endm
75 .text
77 /*
78 * cpu_xsc3_proc_init()
79 *
80 * Nothing too exciting at the moment
81 */
82 ENTRY(cpu_xsc3_proc_init)
83 ret lr
85 /*
86 * cpu_xsc3_proc_fin()
87 */
88 ENTRY(cpu_xsc3_proc_fin)
89 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
90 bic r0, r0, #0x1800 @ ...IZ...........
91 bic r0, r0, #0x0006 @ .............CA.
92 mcr p15, 0, r0, c1, c0, 0 @ disable caches
93 ret lr
95 /*
96 * cpu_xsc3_reset(loc)
97 *
98 * Perform a soft reset of the system. Put the CPU into the
99 * same state as it would be if it had been reset, and branch
100 * to what would be the reset vector.
101 *
102 * loc: location to jump to for soft reset
103 */
104 .align 5
105 .pushsection .idmap.text, "ax"
106 ENTRY(cpu_xsc3_reset)
107 mov r1, #PSR_F_BIT|PSR_I_BIT|SVC_MODE
108 msr cpsr_c, r1 @ reset CPSR
109 mrc p15, 0, r1, c1, c0, 0 @ ctrl register
110 bic r1, r1, #0x3900 @ ..VIZ..S........
111 bic r1, r1, #0x0086 @ ........B....CA.
112 mcr p15, 0, r1, c1, c0, 0 @ ctrl register
113 mcr p15, 0, ip, c7, c7, 0 @ invalidate L1 caches and BTB
114 bic r1, r1, #0x0001 @ ...............M
115 mcr p15, 0, r1, c1, c0, 0 @ ctrl register
116 @ CAUTION: MMU turned off from this point. We count on the pipeline
117 @ already containing those two last instructions to survive.
118 mcr p15, 0, ip, c8, c7, 0 @ invalidate I and D TLBs
119 ret r0
120 ENDPROC(cpu_xsc3_reset)
121 .popsection
123 /*
124 * cpu_xsc3_do_idle()
125 *
126 * Cause the processor to idle
127 *
128 * For now we do nothing but go to idle mode for every case
129 *
130 * XScale supports clock switching, but using idle mode support
131 * allows external hardware to react to system state changes.
132 */
133 .align 5
135 ENTRY(cpu_xsc3_do_idle)
136 mov r0, #1
137 mcr p14, 0, r0, c7, c0, 0 @ go to idle
138 ret lr
140 /* ================================= CACHE ================================ */
142 /*
143 * flush_icache_all()
144 *
145 * Unconditionally clean and invalidate the entire icache.
146 */
147 ENTRY(xsc3_flush_icache_all)
148 mov r0, #0
149 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
150 ret lr
151 ENDPROC(xsc3_flush_icache_all)
153 /*
154 * flush_user_cache_all()
155 *
156 * Invalidate all cache entries in a particular address
157 * space.
158 */
159 ENTRY(xsc3_flush_user_cache_all)
160 /* FALLTHROUGH */
162 /*
163 * flush_kern_cache_all()
164 *
165 * Clean and invalidate the entire cache.
166 */
167 ENTRY(xsc3_flush_kern_cache_all)
168 mov r2, #VM_EXEC
169 mov ip, #0
170 __flush_whole_cache:
171 clean_d_cache r0, r1
172 tst r2, #VM_EXEC
173 mcrne p15, 0, ip, c7, c5, 0 @ invalidate L1 I cache and BTB
174 mcrne p15, 0, ip, c7, c10, 4 @ data write barrier
175 mcrne p15, 0, ip, c7, c5, 4 @ prefetch flush
176 ret lr
178 /*
179 * flush_user_cache_range(start, end, vm_flags)
180 *
181 * Invalidate a range of cache entries in the specified
182 * address space.
183 *
184 * - start - start address (may not be aligned)
185 * - end - end address (exclusive, may not be aligned)
186 * - vma - vma_area_struct describing address space
187 */
188 .align 5
189 ENTRY(xsc3_flush_user_cache_range)
190 mov ip, #0
191 sub r3, r1, r0 @ calculate total size
192 cmp r3, #MAX_AREA_SIZE
193 bhs __flush_whole_cache
195 1: tst r2, #VM_EXEC
196 mcrne p15, 0, r0, c7, c5, 1 @ invalidate L1 I line
197 mcr p15, 0, r0, c7, c14, 1 @ clean/invalidate L1 D line
198 add r0, r0, #CACHELINESIZE
199 cmp r0, r1
200 blo 1b
201 tst r2, #VM_EXEC
202 mcrne p15, 0, ip, c7, c5, 6 @ invalidate BTB
203 mcrne p15, 0, ip, c7, c10, 4 @ data write barrier
204 mcrne p15, 0, ip, c7, c5, 4 @ prefetch flush
205 ret lr
207 /*
208 * coherent_kern_range(start, end)
209 *
210 * Ensure coherency between the I cache and the D cache in the
211 * region described by start. If you have non-snooping
212 * Harvard caches, you need to implement this function.
213 *
214 * - start - virtual start address
215 * - end - virtual end address
216 *
217 * Note: single I-cache line invalidation isn't used here since
218 * it also trashes the mini I-cache used by JTAG debuggers.
219 */
220 ENTRY(xsc3_coherent_kern_range)
221 /* FALLTHROUGH */
222 ENTRY(xsc3_coherent_user_range)
223 bic r0, r0, #CACHELINESIZE - 1
224 1: mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line
225 add r0, r0, #CACHELINESIZE
226 cmp r0, r1
227 blo 1b
228 mov r0, #0
229 mcr p15, 0, r0, c7, c5, 0 @ invalidate L1 I cache and BTB
230 mcr p15, 0, r0, c7, c10, 4 @ data write barrier
231 mcr p15, 0, r0, c7, c5, 4 @ prefetch flush
232 ret lr
234 /*
235 * flush_kern_dcache_area(void *addr, size_t size)
236 *
237 * Ensure no D cache aliasing occurs, either with itself or
238 * the I cache.
239 *
240 * - addr - kernel address
241 * - size - region size
242 */
243 ENTRY(xsc3_flush_kern_dcache_area)
244 add r1, r0, r1
245 1: mcr p15, 0, r0, c7, c14, 1 @ clean/invalidate L1 D line
246 add r0, r0, #CACHELINESIZE
247 cmp r0, r1
248 blo 1b
249 mov r0, #0
250 mcr p15, 0, r0, c7, c5, 0 @ invalidate L1 I cache and BTB
251 mcr p15, 0, r0, c7, c10, 4 @ data write barrier
252 mcr p15, 0, r0, c7, c5, 4 @ prefetch flush
253 ret lr
255 /*
256 * dma_inv_range(start, end)
257 *
258 * Invalidate (discard) the specified virtual address range.
259 * May not write back any entries. If 'start' or 'end'
260 * are not cache line aligned, those lines must be written
261 * back.
262 *
263 * - start - virtual start address
264 * - end - virtual end address
265 */
266 xsc3_dma_inv_range:
267 tst r0, #CACHELINESIZE - 1
268 bic r0, r0, #CACHELINESIZE - 1
269 mcrne p15, 0, r0, c7, c10, 1 @ clean L1 D line
270 tst r1, #CACHELINESIZE - 1
271 mcrne p15, 0, r1, c7, c10, 1 @ clean L1 D line
272 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate L1 D line
273 add r0, r0, #CACHELINESIZE
274 cmp r0, r1
275 blo 1b
276 mcr p15, 0, r0, c7, c10, 4 @ data write barrier
277 ret lr
279 /*
280 * dma_clean_range(start, end)
281 *
282 * Clean the specified virtual address range.
283 *
284 * - start - virtual start address
285 * - end - virtual end address
286 */
287 xsc3_dma_clean_range:
288 bic r0, r0, #CACHELINESIZE - 1
289 1: mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line
290 add r0, r0, #CACHELINESIZE
291 cmp r0, r1
292 blo 1b
293 mcr p15, 0, r0, c7, c10, 4 @ data write barrier
294 ret lr
296 /*
297 * dma_flush_range(start, end)
298 *
299 * Clean and invalidate the specified virtual address range.
300 *
301 * - start - virtual start address
302 * - end - virtual end address
303 */
304 ENTRY(xsc3_dma_flush_range)
305 bic r0, r0, #CACHELINESIZE - 1
306 1: mcr p15, 0, r0, c7, c14, 1 @ clean/invalidate L1 D line
307 add r0, r0, #CACHELINESIZE
308 cmp r0, r1
309 blo 1b
310 mcr p15, 0, r0, c7, c10, 4 @ data write barrier
311 ret lr
313 /*
314 * dma_map_area(start, size, dir)
315 * - start - kernel virtual start address
316 * - size - size of region
317 * - dir - DMA direction
318 */
319 ENTRY(xsc3_dma_map_area)
320 add r1, r1, r0
321 cmp r2, #DMA_TO_DEVICE
322 beq xsc3_dma_clean_range
323 bcs xsc3_dma_inv_range
324 b xsc3_dma_flush_range
325 ENDPROC(xsc3_dma_map_area)
327 /*
328 * dma_unmap_area(start, size, dir)
329 * - start - kernel virtual start address
330 * - size - size of region
331 * - dir - DMA direction
332 */
333 ENTRY(xsc3_dma_unmap_area)
334 ret lr
335 ENDPROC(xsc3_dma_unmap_area)
337 .globl xsc3_flush_kern_cache_louis
338 .equ xsc3_flush_kern_cache_louis, xsc3_flush_kern_cache_all
340 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
341 define_cache_functions xsc3
343 ENTRY(cpu_xsc3_dcache_clean_area)
344 1: mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line
345 add r0, r0, #CACHELINESIZE
346 subs r1, r1, #CACHELINESIZE
347 bhi 1b
348 ret lr
350 /* =============================== PageTable ============================== */
352 /*
353 * cpu_xsc3_switch_mm(pgd)
354 *
355 * Set the translation base pointer to be as described by pgd.
356 *
357 * pgd: new page tables
358 */
359 .align 5
360 ENTRY(cpu_xsc3_switch_mm)
361 clean_d_cache r1, r2
362 mcr p15, 0, ip, c7, c5, 0 @ invalidate L1 I cache and BTB
363 mcr p15, 0, ip, c7, c10, 4 @ data write barrier
364 mcr p15, 0, ip, c7, c5, 4 @ prefetch flush
365 orr r0, r0, #0x18 @ cache the page table in L2
366 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
367 mcr p15, 0, ip, c8, c7, 0 @ invalidate I and D TLBs
368 cpwait_ret lr, ip
370 /*
371 * cpu_xsc3_set_pte_ext(ptep, pte, ext)
372 *
373 * Set a PTE and flush it out
374 */
375 cpu_xsc3_mt_table:
376 .long 0x00 @ L_PTE_MT_UNCACHED
377 .long PTE_EXT_TEX(1) @ L_PTE_MT_BUFFERABLE
378 .long PTE_EXT_TEX(5) | PTE_CACHEABLE @ L_PTE_MT_WRITETHROUGH
379 .long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEBACK
380 .long PTE_EXT_TEX(1) | PTE_BUFFERABLE @ L_PTE_MT_DEV_SHARED
381 .long 0x00 @ unused
382 .long 0x00 @ L_PTE_MT_MINICACHE (not present)
383 .long PTE_EXT_TEX(5) | PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEALLOC (not present?)
384 .long 0x00 @ unused
385 .long PTE_EXT_TEX(1) @ L_PTE_MT_DEV_WC
386 .long 0x00 @ unused
387 .long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_DEV_CACHED
388 .long PTE_EXT_TEX(2) @ L_PTE_MT_DEV_NONSHARED
389 .long 0x00 @ unused
390 .long 0x00 @ unused
391 .long 0x00 @ unused
393 .align 5
394 ENTRY(cpu_xsc3_set_pte_ext)
395 xscale_set_pte_ext_prologue
397 tst r1, #L_PTE_SHARED @ shared?
398 and r1, r1, #L_PTE_MT_MASK
399 adr ip, cpu_xsc3_mt_table
400 ldr ip, [ip, r1]
401 orrne r2, r2, #PTE_EXT_COHERENT @ interlock: mask in coherent bit
402 bic r2, r2, #0x0c @ clear old C,B bits
403 orr r2, r2, ip
405 xscale_set_pte_ext_epilogue
406 ret lr
408 .ltorg
409 .align
411 .globl cpu_xsc3_suspend_size
412 .equ cpu_xsc3_suspend_size, 4 * 6
413 #ifdef CONFIG_ARM_CPU_SUSPEND
414 ENTRY(cpu_xsc3_do_suspend)
415 stmfd sp!, {r4 - r9, lr}
416 mrc p14, 0, r4, c6, c0, 0 @ clock configuration, for turbo mode
417 mrc p15, 0, r5, c15, c1, 0 @ CP access reg
418 mrc p15, 0, r6, c13, c0, 0 @ PID
419 mrc p15, 0, r7, c3, c0, 0 @ domain ID
420 mrc p15, 0, r8, c1, c0, 1 @ auxiliary control reg
421 mrc p15, 0, r9, c1, c0, 0 @ control reg
422 bic r4, r4, #2 @ clear frequency change bit
423 stmia r0, {r4 - r9} @ store cp regs
424 ldmia sp!, {r4 - r9, pc}
425 ENDPROC(cpu_xsc3_do_suspend)
427 ENTRY(cpu_xsc3_do_resume)
428 ldmia r0, {r4 - r9} @ load cp regs
429 mov ip, #0
430 mcr p15, 0, ip, c7, c7, 0 @ invalidate I & D caches, BTB
431 mcr p15, 0, ip, c7, c10, 4 @ drain write (&fill) buffer
432 mcr p15, 0, ip, c7, c5, 4 @ flush prefetch buffer
433 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
434 mcr p14, 0, r4, c6, c0, 0 @ clock configuration, turbo mode.
435 mcr p15, 0, r5, c15, c1, 0 @ CP access reg
436 mcr p15, 0, r6, c13, c0, 0 @ PID
437 mcr p15, 0, r7, c3, c0, 0 @ domain ID
438 orr r1, r1, #0x18 @ cache the page table in L2
439 mcr p15, 0, r1, c2, c0, 0 @ translation table base addr
440 mcr p15, 0, r8, c1, c0, 1 @ auxiliary control reg
441 mov r0, r9 @ control register
442 b cpu_resume_mmu
443 ENDPROC(cpu_xsc3_do_resume)
444 #endif
446 .type __xsc3_setup, #function
447 __xsc3_setup:
448 mov r0, #PSR_F_BIT|PSR_I_BIT|SVC_MODE
449 msr cpsr_c, r0
450 mcr p15, 0, ip, c7, c7, 0 @ invalidate L1 caches and BTB
451 mcr p15, 0, ip, c7, c10, 4 @ data write barrier
452 mcr p15, 0, ip, c7, c5, 4 @ prefetch flush
453 mcr p15, 0, ip, c8, c7, 0 @ invalidate I and D TLBs
454 orr r4, r4, #0x18 @ cache the page table in L2
455 mcr p15, 0, r4, c2, c0, 0 @ load page table pointer
457 mov r0, #1 << 6 @ cp6 access for early sched_clock
458 mcr p15, 0, r0, c15, c1, 0 @ write CP access register
460 mrc p15, 0, r0, c1, c0, 1 @ get auxiliary control reg
461 and r0, r0, #2 @ preserve bit P bit setting
462 orr r0, r0, #(1 << 10) @ enable L2 for LLR cache
463 mcr p15, 0, r0, c1, c0, 1 @ set auxiliary control reg
465 adr r5, xsc3_crval
466 ldmia r5, {r5, r6}
468 #ifdef CONFIG_CACHE_XSC3L2
469 mrc p15, 1, r0, c0, c0, 1 @ get L2 present information
470 ands r0, r0, #0xf8
471 orrne r6, r6, #(1 << 26) @ enable L2 if present
472 #endif
474 mrc p15, 0, r0, c1, c0, 0 @ get control register
475 bic r0, r0, r5 @ ..V. ..R. .... ..A.
476 orr r0, r0, r6 @ ..VI Z..S .... .C.M (mmu)
477 @ ...I Z..S .... .... (uc)
478 ret lr
480 .size __xsc3_setup, . - __xsc3_setup
482 .type xsc3_crval, #object
483 xsc3_crval:
484 crval clear=0x04002202, mmuset=0x00003905, ucset=0x00001900
486 __INITDATA
488 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
489 define_processor_functions xsc3, dabort=v5t_early_abort, pabort=legacy_pabort, suspend=1
491 .section ".rodata"
493 string cpu_arch_name, "armv5te"
494 string cpu_elf_name, "v5"
495 string cpu_xsc3_name, "XScale-V3 based processor"
497 .align
499 .section ".proc.info.init", "a"
501 .macro xsc3_proc_info name:req, cpu_val:req, cpu_mask:req
502 .type __\name\()_proc_info,#object
503 __\name\()_proc_info:
504 .long \cpu_val
505 .long \cpu_mask
506 .long PMD_TYPE_SECT | \
507 PMD_SECT_BUFFERABLE | \
508 PMD_SECT_CACHEABLE | \
509 PMD_SECT_AP_WRITE | \
510 PMD_SECT_AP_READ
511 .long PMD_TYPE_SECT | \
512 PMD_SECT_AP_WRITE | \
513 PMD_SECT_AP_READ
514 initfn __xsc3_setup, __\name\()_proc_info
515 .long cpu_arch_name
516 .long cpu_elf_name
517 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
518 .long cpu_xsc3_name
519 .long xsc3_processor_functions
520 .long v4wbi_tlb_fns
521 .long xsc3_mc_user_fns
522 .long xsc3_cache_fns
523 .size __\name\()_proc_info, . - __\name\()_proc_info
524 .endm
526 xsc3_proc_info xsc3, 0x69056000, 0xffffe000
528 /* Note: PXA935 changed its implementor ID from Intel to Marvell */
529 xsc3_proc_info xsc3_pxa935, 0x56056000, 0xffffe000