1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * linux/arch/arm/mm/proc-arm1026.S: MMU functions for ARM1026EJ-S
5 * Copyright (C) 2000 ARM Limited
6 * Copyright (C) 2000 Deep Blue Solutions Ltd.
7 * hacked for non-paged-MM by Hyok S. Choi, 2003.
9 * These are the low level assembler for performing cache and TLB
10 * functions on the ARM1026EJ-S.
12 #include <linux/linkage.h>
13 #include <linux/init.h>
14 #include <linux/cfi_types.h>
15 #include <linux/pgtable.h>
16 #include <asm/assembler.h>
17 #include <asm/asm-offsets.h>
18 #include <asm/hwcap.h>
19 #include <asm/pgtable-hwdef.h>
20 #include <asm/ptrace.h>
22 #include "proc-macros.S"
25 * This is the maximum size of an area which will be invalidated
26 * using the single invalidate entry instructions. Anything larger
27 * than this, and we go for the whole cache.
29 * This value should be chosen such that we choose the cheapest
32 #define MAX_AREA_SIZE 32768
35 * The size of one data cache line.
37 #define CACHE_DLINESIZE 32
40 * The number of data cache segments.
42 #define CACHE_DSEGMENTS 16
45 * The number of lines in a cache segment.
47 #define CACHE_DENTRIES 64
50 * This is the size at which it becomes more efficient to
51 * clean the whole cache, rather than using the individual
52 * cache line maintenance instructions.
54 #define CACHE_DLIMIT 32768
58 * cpu_arm1026_proc_init()
60 SYM_TYPED_FUNC_START(cpu_arm1026_proc_init)
62 SYM_FUNC_END(cpu_arm1026_proc_init)
65 * cpu_arm1026_proc_fin()
67 SYM_TYPED_FUNC_START(cpu_arm1026_proc_fin)
68 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
69 bic r0, r0, #0x1000 @ ...i............
70 bic r0, r0, #0x000e @ ............wca.
71 mcr p15, 0, r0, c1, c0, 0 @ disable caches
73 SYM_FUNC_END(cpu_arm1026_proc_fin)
76 * cpu_arm1026_reset(loc)
78 * Perform a soft reset of the system. Put the CPU into the
79 * same state as it would be if it had been reset, and branch
80 * to what would be the reset vector.
82 * loc: location to jump to for soft reset
85 .pushsection .idmap.text, "ax"
86 SYM_TYPED_FUNC_START(cpu_arm1026_reset)
88 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
89 mcr p15, 0, ip, c7, c10, 4 @ drain WB
91 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
93 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
94 bic ip, ip, #0x000f @ ............wcam
95 bic ip, ip, #0x1100 @ ...i...s........
96 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
98 SYM_FUNC_END(cpu_arm1026_reset)
102 * cpu_arm1026_do_idle()
105 SYM_TYPED_FUNC_START(cpu_arm1026_do_idle)
106 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
108 SYM_FUNC_END(cpu_arm1026_do_idle)
110 /* ================================= CACHE ================================ */
117 * Unconditionally clean and invalidate the entire icache.
119 SYM_TYPED_FUNC_START(arm1026_flush_icache_all)
120 #ifndef CONFIG_CPU_ICACHE_DISABLE
122 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
125 SYM_FUNC_END(arm1026_flush_icache_all)
128 * flush_user_cache_all()
130 * Invalidate all cache entries in a particular address
133 SYM_FUNC_ALIAS(arm1026_flush_user_cache_all, arm1026_flush_kern_cache_all)
136 * flush_kern_cache_all()
138 * Clean and invalidate the entire cache.
140 SYM_TYPED_FUNC_START(arm1026_flush_kern_cache_all)
144 #ifndef CONFIG_CPU_DCACHE_DISABLE
145 1: mrc p15, 0, APSR_nzcv, c7, c14, 3 @ test, clean, invalidate
149 #ifndef CONFIG_CPU_ICACHE_DISABLE
150 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
152 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
154 SYM_FUNC_END(arm1026_flush_kern_cache_all)
157 * flush_user_cache_range(start, end, flags)
159 * Invalidate a range of cache entries in the specified
162 * - start - start address (inclusive)
163 * - end - end address (exclusive)
164 * - flags - vm_flags for this space
166 SYM_TYPED_FUNC_START(arm1026_flush_user_cache_range)
168 sub r3, r1, r0 @ calculate total size
169 cmp r3, #CACHE_DLIMIT
170 bhs __flush_whole_cache
172 #ifndef CONFIG_CPU_DCACHE_DISABLE
173 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
174 add r0, r0, #CACHE_DLINESIZE
179 #ifndef CONFIG_CPU_ICACHE_DISABLE
180 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
182 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
184 SYM_FUNC_END(arm1026_flush_user_cache_range)
187 * coherent_kern_range(start, end)
189 * Ensure coherency between the Icache and the Dcache in the
190 * region described by start. If you have non-snooping
191 * Harvard caches, you need to implement this function.
193 * - start - virtual start address
194 * - end - virtual end address
196 SYM_TYPED_FUNC_START(arm1026_coherent_kern_range)
197 #ifdef CONFIG_CFI_CLANG /* Fallthrough if !CFI */
198 b arm1026_coherent_user_range
200 SYM_FUNC_END(arm1026_coherent_kern_range)
203 * coherent_user_range(start, end)
205 * Ensure coherency between the Icache and the Dcache in the
206 * region described by start. If you have non-snooping
207 * Harvard caches, you need to implement this function.
209 * - start - virtual start address
210 * - end - virtual end address
212 SYM_TYPED_FUNC_START(arm1026_coherent_user_range)
214 bic r0, r0, #CACHE_DLINESIZE - 1
216 #ifndef CONFIG_CPU_DCACHE_DISABLE
217 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
219 #ifndef CONFIG_CPU_ICACHE_DISABLE
220 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
222 add r0, r0, #CACHE_DLINESIZE
225 mcr p15, 0, ip, c7, c10, 4 @ drain WB
228 SYM_FUNC_END(arm1026_coherent_user_range)
231 * flush_kern_dcache_area(void *addr, size_t size)
233 * Ensure no D cache aliasing occurs, either with itself or
236 * - addr - kernel address
237 * - size - region size
239 SYM_TYPED_FUNC_START(arm1026_flush_kern_dcache_area)
241 #ifndef CONFIG_CPU_DCACHE_DISABLE
243 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
244 add r0, r0, #CACHE_DLINESIZE
248 mcr p15, 0, ip, c7, c10, 4 @ drain WB
250 SYM_FUNC_END(arm1026_flush_kern_dcache_area)
253 * dma_inv_range(start, end)
255 * Invalidate (discard) the specified virtual address range.
256 * May not write back any entries. If 'start' or 'end'
257 * are not cache line aligned, those lines must be written
260 * - start - virtual start address
261 * - end - virtual end address
265 arm1026_dma_inv_range:
267 #ifndef CONFIG_CPU_DCACHE_DISABLE
268 tst r0, #CACHE_DLINESIZE - 1
269 bic r0, r0, #CACHE_DLINESIZE - 1
270 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
271 tst r1, #CACHE_DLINESIZE - 1
272 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
273 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
274 add r0, r0, #CACHE_DLINESIZE
278 mcr p15, 0, ip, c7, c10, 4 @ drain WB
282 * dma_clean_range(start, end)
284 * Clean the specified virtual address range.
286 * - start - virtual start address
287 * - end - virtual end address
291 arm1026_dma_clean_range:
293 #ifndef CONFIG_CPU_DCACHE_DISABLE
294 bic r0, r0, #CACHE_DLINESIZE - 1
295 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
296 add r0, r0, #CACHE_DLINESIZE
300 mcr p15, 0, ip, c7, c10, 4 @ drain WB
304 * dma_flush_range(start, end)
306 * Clean and invalidate the specified virtual address range.
308 * - start - virtual start address
309 * - end - virtual end address
311 SYM_TYPED_FUNC_START(arm1026_dma_flush_range)
313 #ifndef CONFIG_CPU_DCACHE_DISABLE
314 bic r0, r0, #CACHE_DLINESIZE - 1
315 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
316 add r0, r0, #CACHE_DLINESIZE
320 mcr p15, 0, ip, c7, c10, 4 @ drain WB
322 SYM_FUNC_END(arm1026_dma_flush_range)
325 * dma_map_area(start, size, dir)
326 * - start - kernel virtual start address
327 * - size - size of region
328 * - dir - DMA direction
330 SYM_TYPED_FUNC_START(arm1026_dma_map_area)
332 cmp r2, #DMA_TO_DEVICE
333 beq arm1026_dma_clean_range
334 bcs arm1026_dma_inv_range
335 b arm1026_dma_flush_range
336 SYM_FUNC_END(arm1026_dma_map_area)
339 * dma_unmap_area(start, size, dir)
340 * - start - kernel virtual start address
341 * - size - size of region
342 * - dir - DMA direction
344 SYM_TYPED_FUNC_START(arm1026_dma_unmap_area)
346 SYM_FUNC_END(arm1026_dma_unmap_area)
349 SYM_TYPED_FUNC_START(cpu_arm1026_dcache_clean_area)
350 #ifndef CONFIG_CPU_DCACHE_DISABLE
352 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
353 add r0, r0, #CACHE_DLINESIZE
354 subs r1, r1, #CACHE_DLINESIZE
358 SYM_FUNC_END(cpu_arm1026_dcache_clean_area)
360 /* =============================== PageTable ============================== */
363 * cpu_arm1026_switch_mm(pgd)
365 * Set the translation base pointer to be as described by pgd.
367 * pgd: new page tables
370 SYM_TYPED_FUNC_START(cpu_arm1026_switch_mm)
373 #ifndef CONFIG_CPU_DCACHE_DISABLE
374 1: mrc p15, 0, APSR_nzcv, c7, c14, 3 @ test, clean, invalidate
377 #ifndef CONFIG_CPU_ICACHE_DISABLE
378 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
380 mcr p15, 0, r1, c7, c10, 4 @ drain WB
381 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
382 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
385 SYM_FUNC_END(cpu_arm1026_switch_mm)
388 * cpu_arm1026_set_pte_ext(ptep, pte, ext)
390 * Set a PTE and flush it out
393 SYM_TYPED_FUNC_START(cpu_arm1026_set_pte_ext)
397 #ifndef CONFIG_CPU_DCACHE_DISABLE
398 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
400 #endif /* CONFIG_MMU */
402 SYM_FUNC_END(cpu_arm1026_set_pte_ext)
404 .type __arm1026_setup, #function
407 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
408 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
410 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
411 mcr p15, 0, r4, c2, c0 @ load page table pointer
413 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
414 mov r0, #4 @ explicitly disable writeback
415 mcr p15, 7, r0, c15, c0, 0
417 adr r5, arm1026_crval
419 mrc p15, 0, r0, c1, c0 @ get control register v4
422 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
423 orr r0, r0, #0x4000 @ .R.. .... .... ....
426 .size __arm1026_setup, . - __arm1026_setup
430 * .RVI ZFRS BLDP WCAM
431 * .011 1001 ..11 0101
434 .type arm1026_crval, #object
436 crval clear=0x00007f3f, mmuset=0x00003935, ucset=0x00001934
439 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
440 define_processor_functions arm1026, dabort=v5t_early_abort, pabort=legacy_pabort
444 string cpu_arch_name, "armv5tej"
445 string cpu_elf_name, "v5"
447 string cpu_arm1026_name, "ARM1026EJ-S"
450 .section ".proc.info.init", "a"
452 .type __arm1026_proc_info,#object
454 .long 0x4106a260 @ ARM 1026EJ-S (v5TEJ)
456 .long PMD_TYPE_SECT | \
458 PMD_SECT_AP_WRITE | \
460 .long PMD_TYPE_SECT | \
462 PMD_SECT_AP_WRITE | \
464 initfn __arm1026_setup, __arm1026_proc_info
467 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_JAVA
468 .long cpu_arm1026_name
469 .long arm1026_processor_functions
472 .long arm1026_cache_fns
473 .size __arm1026_proc_info, . - __arm1026_proc_info