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 */
23
24 #include <linux/linkage.h>
25 #include <linux/init.h>
26 #include <linux/cfi_types.h>
27 #include <linux/pgtable.h>
28 #include <asm/assembler.h>
29 #include <asm/hwcap.h>
30 #include <asm/pgtable-hwdef.h>
31 #include <asm/page.h>
32 #include <asm/ptrace.h>
33 #include "proc-macros.S"
34
35 /*
36 * This is the maximum size of an area which will be flushed. If the
37 * area is larger than this, then we flush the whole cache.
38 */
39 #define MAX_AREA_SIZE 32768
40
41 /*
42 * The cache line size of the L1 I, L1 D and unified L2 cache.
43 */
44 #define CACHELINESIZE 32
45
46 /*
47 * The size of the L1 D cache.
48 */
49 #define CACHESIZE 32768
50
51 /*
52 * This macro is used to wait for a CP15 write and is needed when we
53 * have to ensure that the last operation to the coprocessor was
54 * completed before continuing with operation.
55 */
56 .macro cpwait_ret, lr, rd
57 mrc p15, 0, \rd, c2, c0, 0 @ arbitrary read of cp15
58 sub pc, \lr, \rd, LSR #32 @ wait for completion and
59 @ flush instruction pipeline
60 .endm
61
62 /*
63 * This macro cleans and invalidates the entire L1 D cache.
64 */
65
66 .macro clean_d_cache rd, rs
67 mov \rd, #0x1f00
68 orr \rd, \rd, #0x00e0
69 1: mcr p15, 0, \rd, c7, c14, 2 @ clean/invalidate L1 D line
70 adds \rd, \rd, #0x40000000
71 bcc 1b
72 subs \rd, \rd, #0x20
73 bpl 1b
74 .endm
75
76 .text
77
78 /*
79 * cpu_xsc3_proc_init()
80 *
81 * Nothing too exciting at the moment
82 */
83 SYM_TYPED_FUNC_START(cpu_xsc3_proc_init)
84 ret lr
85 SYM_FUNC_END(cpu_xsc3_proc_init)
86
87 /*
88 * cpu_xsc3_proc_fin()
89 */
90 SYM_TYPED_FUNC_START(cpu_xsc3_proc_fin)
91 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
92 bic r0, r0, #0x1800 @ ...IZ...........
93 bic r0, r0, #0x0006 @ .............CA.
94 mcr p15, 0, r0, c1, c0, 0 @ disable caches
95 ret lr
96 SYM_FUNC_END(cpu_xsc3_proc_fin)
97
98 /*
99 * cpu_xsc3_reset(loc)
100 *
101 * Perform a soft reset of the system. Put the CPU into the
102 * same state as it would be if it had been reset, and branch
103 * to what would be the reset vector.
104 *
105 * loc: location to jump to for soft reset
106 */
107 .align 5
108 .pushsection .idmap.text, "ax"
109 SYM_TYPED_FUNC_START(cpu_xsc3_reset)
110 mov r1, #PSR_F_BIT|PSR_I_BIT|SVC_MODE
111 msr cpsr_c, r1 @ reset CPSR
112 mrc p15, 0, r1, c1, c0, 0 @ ctrl register
113 bic r1, r1, #0x3900 @ ..VIZ..S........
114 bic r1, r1, #0x0086 @ ........B....CA.
115 mcr p15, 0, r1, c1, c0, 0 @ ctrl register
116 mcr p15, 0, ip, c7, c7, 0 @ invalidate L1 caches and BTB
117 bic r1, r1, #0x0001 @ ...............M
118 mcr p15, 0, r1, c1, c0, 0 @ ctrl register
119 @ CAUTION: MMU turned off from this point. We count on the pipeline
120 @ already containing those two last instructions to survive.
121 mcr p15, 0, ip, c8, c7, 0 @ invalidate I and D TLBs
122 ret r0
123 SYM_FUNC_END(cpu_xsc3_reset)
124 .popsection
125
126 /*
127 * cpu_xsc3_do_idle()
128 *
129 * Cause the processor to idle
130 *
131 * For now we do nothing but go to idle mode for every case
132 *
133 * XScale supports clock switching, but using idle mode support
134 * allows external hardware to react to system state changes.
135 */
136 .align 5
137
138 SYM_TYPED_FUNC_START(cpu_xsc3_do_idle)
139 mov r0, #1
140 mcr p14, 0, r0, c7, c0, 0 @ go to idle
141 ret lr
142 SYM_FUNC_END(cpu_xsc3_do_idle)
143
144 /* ================================= CACHE ================================ */
145
146 /*
147 * flush_icache_all()
148 *
149 * Unconditionally clean and invalidate the entire icache.
150 */
151 SYM_TYPED_FUNC_START(xsc3_flush_icache_all)
152 mov r0, #0
153 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
154 ret lr
155 SYM_FUNC_END(xsc3_flush_icache_all)
156
157 /*
158 * flush_user_cache_all()
159 *
160 * Invalidate all cache entries in a particular address
161 * space.
162 */
163 SYM_FUNC_ALIAS(xsc3_flush_user_cache_all, xsc3_flush_kern_cache_all)
164
165 /*
166 * flush_kern_cache_all()
167 *
168 * Clean and invalidate the entire cache.
169 */
170 SYM_TYPED_FUNC_START(xsc3_flush_kern_cache_all)
171 mov r2, #VM_EXEC
172 mov ip, #0
173 __flush_whole_cache:
174 clean_d_cache r0, r1
175 tst r2, #VM_EXEC
176 mcrne p15, 0, ip, c7, c5, 0 @ invalidate L1 I cache and BTB
177 mcrne p15, 0, ip, c7, c10, 4 @ data write barrier
178 mcrne p15, 0, ip, c7, c5, 4 @ prefetch flush
179 ret lr
180 SYM_FUNC_END(xsc3_flush_kern_cache_all)
181
182 /*
183 * flush_user_cache_range(start, end, vm_flags)
184 *
185 * Invalidate a range of cache entries in the specified
186 * address space.
187 *
188 * - start - start address (may not be aligned)
189 * - end - end address (exclusive, may not be aligned)
190 * - vma - vma_area_struct describing address space
191 */
192 .align 5
193 SYM_TYPED_FUNC_START(xsc3_flush_user_cache_range)
194 mov ip, #0
195 sub r3, r1, r0 @ calculate total size
196 cmp r3, #MAX_AREA_SIZE
197 bhs __flush_whole_cache
198
199 1: tst r2, #VM_EXEC
200 mcrne p15, 0, r0, c7, c5, 1 @ invalidate L1 I line
201 mcr p15, 0, r0, c7, c14, 1 @ clean/invalidate L1 D line
202 add r0, r0, #CACHELINESIZE
203 cmp r0, r1
204 blo 1b
205 tst r2, #VM_EXEC
206 mcrne p15, 0, ip, c7, c5, 6 @ invalidate BTB
207 mcrne p15, 0, ip, c7, c10, 4 @ data write barrier
208 mcrne p15, 0, ip, c7, c5, 4 @ prefetch flush
209 ret lr
210 SYM_FUNC_END(xsc3_flush_user_cache_range)
211
212 /*
213 * coherent_kern_range(start, end)
214 *
215 * Ensure coherency between the I cache and the D cache in the
216 * region described by start. If you have non-snooping
217 * Harvard caches, you need to implement this function.
218 *
219 * - start - virtual start address
220 * - end - virtual end address
221 *
222 * Note: single I-cache line invalidation isn't used here since
223 * it also trashes the mini I-cache used by JTAG debuggers.
224 */
225 SYM_TYPED_FUNC_START(xsc3_coherent_kern_range)
226 #ifdef CONFIG_CFI_CLANG /* Fallthrough if !CFI */
227 b xsc3_coherent_user_range
228 #endif
229 SYM_FUNC_END(xsc3_coherent_kern_range)
230
231 SYM_TYPED_FUNC_START(xsc3_coherent_user_range)
232 bic r0, r0, #CACHELINESIZE - 1
233 1: mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line
234 add r0, r0, #CACHELINESIZE
235 cmp r0, r1
236 blo 1b
237 mov r0, #0
238 mcr p15, 0, r0, c7, c5, 0 @ invalidate L1 I cache and BTB
239 mcr p15, 0, r0, c7, c10, 4 @ data write barrier
240 mcr p15, 0, r0, c7, c5, 4 @ prefetch flush
241 ret lr
242 SYM_FUNC_END(xsc3_coherent_user_range)
243
244 /*
245 * flush_kern_dcache_area(void *addr, size_t size)
246 *
247 * Ensure no D cache aliasing occurs, either with itself or
248 * the I cache.
249 *
250 * - addr - kernel address
251 * - size - region size
252 */
253 SYM_TYPED_FUNC_START(xsc3_flush_kern_dcache_area)
254 add r1, r0, r1
255 1: mcr p15, 0, r0, c7, c14, 1 @ clean/invalidate L1 D line
256 add r0, r0, #CACHELINESIZE
257 cmp r0, r1
258 blo 1b
259 mov r0, #0
260 mcr p15, 0, r0, c7, c5, 0 @ invalidate L1 I cache and BTB
261 mcr p15, 0, r0, c7, c10, 4 @ data write barrier
262 mcr p15, 0, r0, c7, c5, 4 @ prefetch flush
263 ret lr
264 SYM_FUNC_END(xsc3_flush_kern_dcache_area)
265
266 /*
267 * dma_inv_range(start, end)
268 *
269 * Invalidate (discard) the specified virtual address range.
270 * May not write back any entries. If 'start' or 'end'
271 * are not cache line aligned, those lines must be written
272 * back.
273 *
274 * - start - virtual start address
275 * - end - virtual end address
276 */
277 xsc3_dma_inv_range:
278 tst r0, #CACHELINESIZE - 1
279 bic r0, r0, #CACHELINESIZE - 1
280 mcrne p15, 0, r0, c7, c10, 1 @ clean L1 D line
281 tst r1, #CACHELINESIZE - 1
282 mcrne p15, 0, r1, c7, c10, 1 @ clean L1 D line
283 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate L1 D line
284 add r0, r0, #CACHELINESIZE
285 cmp r0, r1
286 blo 1b
287 mcr p15, 0, r0, c7, c10, 4 @ data write barrier
288 ret lr
289
290 /*
291 * dma_clean_range(start, end)
292 *
293 * Clean the specified virtual address range.
294 *
295 * - start - virtual start address
296 * - end - virtual end address
297 */
298 xsc3_dma_clean_range:
299 bic r0, r0, #CACHELINESIZE - 1
300 1: mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line
301 add r0, r0, #CACHELINESIZE
302 cmp r0, r1
303 blo 1b
304 mcr p15, 0, r0, c7, c10, 4 @ data write barrier
305 ret lr
306
307 /*
308 * dma_flush_range(start, end)
309 *
310 * Clean and invalidate the specified virtual address range.
311 *
312 * - start - virtual start address
313 * - end - virtual end address
314 */
315 SYM_TYPED_FUNC_START(xsc3_dma_flush_range)
316 bic r0, r0, #CACHELINESIZE - 1
317 1: mcr p15, 0, r0, c7, c14, 1 @ clean/invalidate L1 D line
318 add r0, r0, #CACHELINESIZE
319 cmp r0, r1
320 blo 1b
321 mcr p15, 0, r0, c7, c10, 4 @ data write barrier
322 ret lr
323 SYM_FUNC_END(xsc3_dma_flush_range)
324
325 /*
326 * dma_map_area(start, size, dir)
327 * - start - kernel virtual start address
328 * - size - size of region
329 * - dir - DMA direction
330 */
331 SYM_TYPED_FUNC_START(xsc3_dma_map_area)
332 add r1, r1, r0
333 cmp r2, #DMA_TO_DEVICE
334 beq xsc3_dma_clean_range
335 bcs xsc3_dma_inv_range
336 b xsc3_dma_flush_range
337 SYM_FUNC_END(xsc3_dma_map_area)
338
339 /*
340 * dma_unmap_area(start, size, dir)
341 * - start - kernel virtual start address
342 * - size - size of region
343 * - dir - DMA direction
344 */
345 SYM_TYPED_FUNC_START(xsc3_dma_unmap_area)
346 ret lr
347 SYM_FUNC_END(xsc3_dma_unmap_area)
348
349 SYM_TYPED_FUNC_START(cpu_xsc3_dcache_clean_area)
350 1: mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line
351 add r0, r0, #CACHELINESIZE
352 subs r1, r1, #CACHELINESIZE
353 bhi 1b
354 ret lr
355 SYM_FUNC_END(cpu_xsc3_dcache_clean_area)
356
357 /* =============================== PageTable ============================== */
358
359 /*
360 * cpu_xsc3_switch_mm(pgd)
361 *
362 * Set the translation base pointer to be as described by pgd.
363 *
364 * pgd: new page tables
365 */
366 .align 5
367 SYM_TYPED_FUNC_START(cpu_xsc3_switch_mm)
368 clean_d_cache r1, r2
369 mcr p15, 0, ip, c7, c5, 0 @ invalidate L1 I cache and BTB
370 mcr p15, 0, ip, c7, c10, 4 @ data write barrier
371 mcr p15, 0, ip, c7, c5, 4 @ prefetch flush
372 orr r0, r0, #0x18 @ cache the page table in L2
373 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
374 mcr p15, 0, ip, c8, c7, 0 @ invalidate I and D TLBs
375 cpwait_ret lr, ip
376 SYM_FUNC_END(cpu_xsc3_switch_mm)
377
378 /*
379 * cpu_xsc3_set_pte_ext(ptep, pte, ext)
380 *
381 * Set a PTE and flush it out
382 */
383 cpu_xsc3_mt_table:
384 .long 0x00 @ L_PTE_MT_UNCACHED
385 .long PTE_EXT_TEX(1) @ L_PTE_MT_BUFFERABLE
386 .long PTE_EXT_TEX(5) | PTE_CACHEABLE @ L_PTE_MT_WRITETHROUGH
387 .long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEBACK
388 .long PTE_EXT_TEX(1) | PTE_BUFFERABLE @ L_PTE_MT_DEV_SHARED
389 .long 0x00 @ unused
390 .long 0x00 @ L_PTE_MT_MINICACHE (not present)
391 .long PTE_EXT_TEX(5) | PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEALLOC (not present?)
392 .long 0x00 @ unused
393 .long PTE_EXT_TEX(1) @ L_PTE_MT_DEV_WC
394 .long 0x00 @ unused
395 .long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_DEV_CACHED
396 .long PTE_EXT_TEX(2) @ L_PTE_MT_DEV_NONSHARED
397 .long 0x00 @ unused
398 .long 0x00 @ unused
399 .long 0x00 @ unused
400
401 .align 5
402 SYM_TYPED_FUNC_START(cpu_xsc3_set_pte_ext)
403 xscale_set_pte_ext_prologue
404
405 tst r1, #L_PTE_SHARED @ shared?
406 and r1, r1, #L_PTE_MT_MASK
407 adr ip, cpu_xsc3_mt_table
408 ldr ip, [ip, r1]
409 orrne r2, r2, #PTE_EXT_COHERENT @ interlock: mask in coherent bit
410 bic r2, r2, #0x0c @ clear old C,B bits
411 orr r2, r2, ip
412
413 xscale_set_pte_ext_epilogue
414 ret lr
415 SYM_FUNC_END(cpu_xsc3_set_pte_ext)
416
417 .ltorg
418 .align
419
420 .globl cpu_xsc3_suspend_size
421 .equ cpu_xsc3_suspend_size, 4 * 6
422 #ifdef CONFIG_ARM_CPU_SUSPEND
423 SYM_TYPED_FUNC_START(cpu_xsc3_do_suspend)
424 stmfd sp!, {r4 - r9, lr}
425 mrc p14, 0, r4, c6, c0, 0 @ clock configuration, for turbo mode
426 mrc p15, 0, r5, c15, c1, 0 @ CP access reg
427 mrc p15, 0, r6, c13, c0, 0 @ PID
428 mrc p15, 0, r7, c3, c0, 0 @ domain ID
429 mrc p15, 0, r8, c1, c0, 1 @ auxiliary control reg
430 mrc p15, 0, r9, c1, c0, 0 @ control reg
431 bic r4, r4, #2 @ clear frequency change bit
432 stmia r0, {r4 - r9} @ store cp regs
433 ldmia sp!, {r4 - r9, pc}
434 SYM_FUNC_END(cpu_xsc3_do_suspend)
435
436 SYM_TYPED_FUNC_START(cpu_xsc3_do_resume)
437 ldmia r0, {r4 - r9} @ load cp regs
438 mov ip, #0
439 mcr p15, 0, ip, c7, c7, 0 @ invalidate I & D caches, BTB
440 mcr p15, 0, ip, c7, c10, 4 @ drain write (&fill) buffer
441 mcr p15, 0, ip, c7, c5, 4 @ flush prefetch buffer
442 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
443 mcr p14, 0, r4, c6, c0, 0 @ clock configuration, turbo mode.
444 mcr p15, 0, r5, c15, c1, 0 @ CP access reg
445 mcr p15, 0, r6, c13, c0, 0 @ PID
446 mcr p15, 0, r7, c3, c0, 0 @ domain ID
447 orr r1, r1, #0x18 @ cache the page table in L2
448 mcr p15, 0, r1, c2, c0, 0 @ translation table base addr
449 mcr p15, 0, r8, c1, c0, 1 @ auxiliary control reg
450 mov r0, r9 @ control register
451 b cpu_resume_mmu
452 SYM_FUNC_END(cpu_xsc3_do_resume)
453 #endif
454
455 .type __xsc3_setup, #function
456 __xsc3_setup:
457 mov r0, #PSR_F_BIT|PSR_I_BIT|SVC_MODE
458 msr cpsr_c, r0
459 mcr p15, 0, ip, c7, c7, 0 @ invalidate L1 caches and BTB
460 mcr p15, 0, ip, c7, c10, 4 @ data write barrier
461 mcr p15, 0, ip, c7, c5, 4 @ prefetch flush
462 mcr p15, 0, ip, c8, c7, 0 @ invalidate I and D TLBs
463 orr r4, r4, #0x18 @ cache the page table in L2
464 mcr p15, 0, r4, c2, c0, 0 @ load page table pointer
465
466 mov r0, #1 << 6 @ cp6 access for early sched_clock
467 mcr p15, 0, r0, c15, c1, 0 @ write CP access register
468
469 mrc p15, 0, r0, c1, c0, 1 @ get auxiliary control reg
470 and r0, r0, #2 @ preserve bit P bit setting
471 orr r0, r0, #(1 << 10) @ enable L2 for LLR cache
472 mcr p15, 0, r0, c1, c0, 1 @ set auxiliary control reg
473
474 adr r5, xsc3_crval
475 ldmia r5, {r5, r6}
476
477 #ifdef CONFIG_CACHE_XSC3L2
478 mrc p15, 1, r0, c0, c0, 1 @ get L2 present information
479 ands r0, r0, #0xf8
480 orrne r6, r6, #(1 << 26) @ enable L2 if present
481 #endif
482
483 mrc p15, 0, r0, c1, c0, 0 @ get control register
484 bic r0, r0, r5 @ ..V. ..R. .... ..A.
485 orr r0, r0, r6 @ ..VI Z..S .... .C.M (mmu)
486 @ ...I Z..S .... .... (uc)
487 ret lr
488
489 .size __xsc3_setup, . - __xsc3_setup
490
491 .type xsc3_crval, #object
492 xsc3_crval:
493 crval clear=0x04002202, mmuset=0x00003905, ucset=0x00001900
494
495 __INITDATA
496
497 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
498 define_processor_functions xsc3, dabort=v5t_early_abort, pabort=legacy_pabort, suspend=1
499
500 .section ".rodata"
501
502 string cpu_arch_name, "armv5te"
503 string cpu_elf_name, "v5"
504 string cpu_xsc3_name, "XScale-V3 based processor"
505
506 .align
507
508 .section ".proc.info.init", "a"
509
510 .macro xsc3_proc_info name:req, cpu_val:req, cpu_mask:req
511 .type __\name\()_proc_info,#object
512 __\name\()_proc_info:
513 .long \cpu_val
514 .long \cpu_mask
515 .long PMD_TYPE_SECT | \
516 PMD_SECT_BUFFERABLE | \
517 PMD_SECT_CACHEABLE | \
518 PMD_SECT_AP_WRITE | \
519 PMD_SECT_AP_READ
520 .long PMD_TYPE_SECT | \
521 PMD_SECT_AP_WRITE | \
522 PMD_SECT_AP_READ
523 initfn __xsc3_setup, __\name\()_proc_info
524 .long cpu_arch_name
525 .long cpu_elf_name
526 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
527 .long cpu_xsc3_name
528 .long xsc3_processor_functions
529 .long v4wbi_tlb_fns
530 .long xsc3_mc_user_fns
531 .long xsc3_cache_fns
532 .size __\name\()_proc_info, . - __\name\()_proc_info
533 .endm
534
535 xsc3_proc_info xsc3, 0x69056000, 0xffffe000
536
537 /* Note: PXA935 changed its implementor ID from Intel to Marvell */
538 xsc3_proc_info xsc3_pxa935, 0x56056000, 0xffffe000
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