1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * linux/arch/arm/mm/proc-arm1022.S: MMU functions for ARM1022E
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 ARM1022E.
12 #include <linux/linkage.h>
13 #include <linux/init.h>
14 #include <asm/assembler.h>
15 #include <asm/asm-offsets.h>
16 #include <asm/hwcap.h>
17 #include <asm/pgtable-hwdef.h>
18 #include <asm/pgtable.h>
19 #include <asm/ptrace.h>
21 #include "proc-macros.S"
24 * This is the maximum size of an area which will be invalidated
25 * using the single invalidate entry instructions. Anything larger
26 * than this, and we go for the whole cache.
28 * This value should be chosen such that we choose the cheapest
31 #define MAX_AREA_SIZE 32768
34 * The size of one data cache line.
36 #define CACHE_DLINESIZE 32
39 * The number of data cache segments.
41 #define CACHE_DSEGMENTS 16
44 * The number of lines in a cache segment.
46 #define CACHE_DENTRIES 64
49 * This is the size at which it becomes more efficient to
50 * clean the whole cache, rather than using the individual
51 * cache line maintenance instructions.
53 #define CACHE_DLIMIT 32768
57 * cpu_arm1022_proc_init()
59 ENTRY(cpu_arm1022_proc_init)
63 * cpu_arm1022_proc_fin()
65 ENTRY(cpu_arm1022_proc_fin)
66 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
67 bic r0, r0, #0x1000 @ ...i............
68 bic r0, r0, #0x000e @ ............wca.
69 mcr p15, 0, r0, c1, c0, 0 @ disable caches
73 * cpu_arm1022_reset(loc)
75 * Perform a soft reset of the system. Put the CPU into the
76 * same state as it would be if it had been reset, and branch
77 * to what would be the reset vector.
79 * loc: location to jump to for soft reset
82 .pushsection .idmap.text, "ax"
83 ENTRY(cpu_arm1022_reset)
85 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
86 mcr p15, 0, ip, c7, c10, 4 @ drain WB
88 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
90 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
91 bic ip, ip, #0x000f @ ............wcam
92 bic ip, ip, #0x1100 @ ...i...s........
93 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
95 ENDPROC(cpu_arm1022_reset)
99 * cpu_arm1022_do_idle()
102 ENTRY(cpu_arm1022_do_idle)
103 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
106 /* ================================= CACHE ================================ */
113 * Unconditionally clean and invalidate the entire icache.
115 ENTRY(arm1022_flush_icache_all)
116 #ifndef CONFIG_CPU_ICACHE_DISABLE
118 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
121 ENDPROC(arm1022_flush_icache_all)
124 * flush_user_cache_all()
126 * Invalidate all cache entries in a particular address
129 ENTRY(arm1022_flush_user_cache_all)
132 * flush_kern_cache_all()
134 * Clean and invalidate the entire cache.
136 ENTRY(arm1022_flush_kern_cache_all)
140 #ifndef CONFIG_CPU_DCACHE_DISABLE
141 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments
142 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
143 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
144 subs r3, r3, #1 << 26
145 bcs 2b @ entries 63 to 0
147 bcs 1b @ segments 15 to 0
150 #ifndef CONFIG_CPU_ICACHE_DISABLE
151 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
153 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
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 ENTRY(arm1022_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
186 * coherent_kern_range(start, end)
188 * Ensure coherency between the Icache and the Dcache in the
189 * region described by start. If you have non-snooping
190 * Harvard caches, you need to implement this function.
192 * - start - virtual start address
193 * - end - virtual end address
195 ENTRY(arm1022_coherent_kern_range)
199 * coherent_user_range(start, end)
201 * Ensure coherency between the Icache and the Dcache in the
202 * region described by start. If you have non-snooping
203 * Harvard caches, you need to implement this function.
205 * - start - virtual start address
206 * - end - virtual end address
208 ENTRY(arm1022_coherent_user_range)
210 bic r0, r0, #CACHE_DLINESIZE - 1
212 #ifndef CONFIG_CPU_DCACHE_DISABLE
213 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
215 #ifndef CONFIG_CPU_ICACHE_DISABLE
216 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
218 add r0, r0, #CACHE_DLINESIZE
221 mcr p15, 0, ip, c7, c10, 4 @ drain WB
226 * flush_kern_dcache_area(void *addr, size_t size)
228 * Ensure no D cache aliasing occurs, either with itself or
231 * - addr - kernel address
232 * - size - region size
234 ENTRY(arm1022_flush_kern_dcache_area)
236 #ifndef CONFIG_CPU_DCACHE_DISABLE
238 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
239 add r0, r0, #CACHE_DLINESIZE
243 mcr p15, 0, ip, c7, c10, 4 @ drain WB
247 * dma_inv_range(start, end)
249 * Invalidate (discard) the specified virtual address range.
250 * May not write back any entries. If 'start' or 'end'
251 * are not cache line aligned, those lines must be written
254 * - start - virtual start address
255 * - end - virtual end address
259 arm1022_dma_inv_range:
261 #ifndef CONFIG_CPU_DCACHE_DISABLE
262 tst r0, #CACHE_DLINESIZE - 1
263 bic r0, r0, #CACHE_DLINESIZE - 1
264 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
265 tst r1, #CACHE_DLINESIZE - 1
266 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
267 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
268 add r0, r0, #CACHE_DLINESIZE
272 mcr p15, 0, ip, c7, c10, 4 @ drain WB
276 * dma_clean_range(start, end)
278 * Clean the specified virtual address range.
280 * - start - virtual start address
281 * - end - virtual end address
285 arm1022_dma_clean_range:
287 #ifndef CONFIG_CPU_DCACHE_DISABLE
288 bic r0, r0, #CACHE_DLINESIZE - 1
289 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
290 add r0, r0, #CACHE_DLINESIZE
294 mcr p15, 0, ip, c7, c10, 4 @ drain WB
298 * dma_flush_range(start, end)
300 * Clean and invalidate the specified virtual address range.
302 * - start - virtual start address
303 * - end - virtual end address
305 ENTRY(arm1022_dma_flush_range)
307 #ifndef CONFIG_CPU_DCACHE_DISABLE
308 bic r0, r0, #CACHE_DLINESIZE - 1
309 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
310 add r0, r0, #CACHE_DLINESIZE
314 mcr p15, 0, ip, c7, c10, 4 @ drain WB
318 * dma_map_area(start, size, dir)
319 * - start - kernel virtual start address
320 * - size - size of region
321 * - dir - DMA direction
323 ENTRY(arm1022_dma_map_area)
325 cmp r2, #DMA_TO_DEVICE
326 beq arm1022_dma_clean_range
327 bcs arm1022_dma_inv_range
328 b arm1022_dma_flush_range
329 ENDPROC(arm1022_dma_map_area)
332 * dma_unmap_area(start, size, dir)
333 * - start - kernel virtual start address
334 * - size - size of region
335 * - dir - DMA direction
337 ENTRY(arm1022_dma_unmap_area)
339 ENDPROC(arm1022_dma_unmap_area)
341 .globl arm1022_flush_kern_cache_louis
342 .equ arm1022_flush_kern_cache_louis, arm1022_flush_kern_cache_all
344 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
345 define_cache_functions arm1022
348 ENTRY(cpu_arm1022_dcache_clean_area)
349 #ifndef CONFIG_CPU_DCACHE_DISABLE
351 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
352 add r0, r0, #CACHE_DLINESIZE
353 subs r1, r1, #CACHE_DLINESIZE
358 /* =============================== PageTable ============================== */
361 * cpu_arm1022_switch_mm(pgd)
363 * Set the translation base pointer to be as described by pgd.
365 * pgd: new page tables
368 ENTRY(cpu_arm1022_switch_mm)
370 #ifndef CONFIG_CPU_DCACHE_DISABLE
371 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments
372 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
373 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
374 subs r3, r3, #1 << 26
375 bcs 2b @ entries 63 to 0
377 bcs 1b @ segments 15 to 0
380 #ifndef CONFIG_CPU_ICACHE_DISABLE
381 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
383 mcr p15, 0, r1, c7, c10, 4 @ drain WB
384 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
385 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
390 * cpu_arm1022_set_pte_ext(ptep, pte, ext)
392 * Set a PTE and flush it out
395 ENTRY(cpu_arm1022_set_pte_ext)
399 #ifndef CONFIG_CPU_DCACHE_DISABLE
400 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
402 #endif /* CONFIG_MMU */
405 .type __arm1022_setup, #function
408 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
409 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
411 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
413 adr r5, arm1022_crval
415 mrc p15, 0, r0, c1, c0 @ get control register v4
418 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
419 orr r0, r0, #0x4000 @ .R..............
422 .size __arm1022_setup, . - __arm1022_setup
426 * .RVI ZFRS BLDP WCAM
427 * .011 1001 ..11 0101
430 .type arm1022_crval, #object
432 crval clear=0x00007f3f, mmuset=0x00003935, ucset=0x00001930
435 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
436 define_processor_functions arm1022, dabort=v4t_early_abort, pabort=legacy_pabort
440 string cpu_arch_name, "armv5te"
441 string cpu_elf_name, "v5"
442 string cpu_arm1022_name, "ARM1022"
446 .section ".proc.info.init", "a"
448 .type __arm1022_proc_info,#object
450 .long 0x4105a220 @ ARM 1022E (v5TE)
452 .long PMD_TYPE_SECT | \
454 PMD_SECT_AP_WRITE | \
456 .long PMD_TYPE_SECT | \
458 PMD_SECT_AP_WRITE | \
460 initfn __arm1022_setup, __arm1022_proc_info
463 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_EDSP
464 .long cpu_arm1022_name
465 .long arm1022_processor_functions
468 .long arm1022_cache_fns
469 .size __arm1022_proc_info, . - __arm1022_proc_info