1/* 2 * linux/arch/arm/mm/proc-arm1022.S: MMU functions for ARM1022E 3 * 4 * Copyright (C) 2000 ARM Limited 5 * Copyright (C) 2000 Deep Blue Solutions Ltd. 6 * hacked for non-paged-MM by Hyok S. Choi, 2003. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * 14 * These are the low level assembler for performing cache and TLB 15 * functions on the ARM1022E. 16 */ 17#include <linux/linkage.h> 18#include <linux/init.h> 19#include <asm/assembler.h> 20#include <asm/asm-offsets.h> 21#include <asm/hwcap.h> 22#include <asm/pgtable-hwdef.h> 23#include <asm/pgtable.h> 24#include <asm/ptrace.h> 25 26#include "proc-macros.S" 27 28/* 29 * This is the maximum size of an area which will be invalidated 30 * using the single invalidate entry instructions. Anything larger 31 * than this, and we go for the whole cache. 32 * 33 * This value should be chosen such that we choose the cheapest 34 * alternative. 35 */ 36#define MAX_AREA_SIZE 32768 37 38/* 39 * The size of one data cache line. 40 */ 41#define CACHE_DLINESIZE 32 42 43/* 44 * The number of data cache segments. 45 */ 46#define CACHE_DSEGMENTS 16 47 48/* 49 * The number of lines in a cache segment. 50 */ 51#define CACHE_DENTRIES 64 52 53/* 54 * This is the size at which it becomes more efficient to 55 * clean the whole cache, rather than using the individual 56 * cache line maintenance instructions. 57 */ 58#define CACHE_DLIMIT 32768 59 60 .text 61/* 62 * cpu_arm1022_proc_init() 63 */ 64ENTRY(cpu_arm1022_proc_init) 65 ret lr 66 67/* 68 * cpu_arm1022_proc_fin() 69 */ 70ENTRY(cpu_arm1022_proc_fin) 71 mrc p15, 0, r0, c1, c0, 0 @ ctrl register 72 bic r0, r0, #0x1000 @ ...i............ 73 bic r0, r0, #0x000e @ ............wca. 74 mcr p15, 0, r0, c1, c0, 0 @ disable caches 75 ret lr 76 77/* 78 * cpu_arm1022_reset(loc) 79 * 80 * Perform a soft reset of the system. Put the CPU into the 81 * same state as it would be if it had been reset, and branch 82 * to what would be the reset vector. 83 * 84 * loc: location to jump to for soft reset 85 */ 86 .align 5 87 .pushsection .idmap.text, "ax" 88ENTRY(cpu_arm1022_reset) 89 mov ip, #0 90 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches 91 mcr p15, 0, ip, c7, c10, 4 @ drain WB 92#ifdef CONFIG_MMU 93 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs 94#endif 95 mrc p15, 0, ip, c1, c0, 0 @ ctrl register 96 bic ip, ip, #0x000f @ ............wcam 97 bic ip, ip, #0x1100 @ ...i...s........ 98 mcr p15, 0, ip, c1, c0, 0 @ ctrl register 99 ret r0 100ENDPROC(cpu_arm1022_reset) 101 .popsection 102 103/* 104 * cpu_arm1022_do_idle() 105 */ 106 .align 5 107ENTRY(cpu_arm1022_do_idle) 108 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt 109 ret lr 110 111/* ================================= CACHE ================================ */ 112 113 .align 5 114 115/* 116 * flush_icache_all() 117 * 118 * Unconditionally clean and invalidate the entire icache. 119 */ 120ENTRY(arm1022_flush_icache_all) 121#ifndef CONFIG_CPU_ICACHE_DISABLE 122 mov r0, #0 123 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache 124#endif 125 ret lr 126ENDPROC(arm1022_flush_icache_all) 127 128/* 129 * flush_user_cache_all() 130 * 131 * Invalidate all cache entries in a particular address 132 * space. 133 */ 134ENTRY(arm1022_flush_user_cache_all) 135 /* FALLTHROUGH */ 136/* 137 * flush_kern_cache_all() 138 * 139 * Clean and invalidate the entire cache. 140 */ 141ENTRY(arm1022_flush_kern_cache_all) 142 mov r2, #VM_EXEC 143 mov ip, #0 144__flush_whole_cache: 145#ifndef CONFIG_CPU_DCACHE_DISABLE 146 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments 1471: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries 1482: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index 149 subs r3, r3, #1 << 26 150 bcs 2b @ entries 63 to 0 151 subs r1, r1, #1 << 5 152 bcs 1b @ segments 15 to 0 153#endif 154 tst r2, #VM_EXEC 155#ifndef CONFIG_CPU_ICACHE_DISABLE 156 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache 157#endif 158 mcrne p15, 0, ip, c7, c10, 4 @ drain WB 159 ret lr 160 161/* 162 * flush_user_cache_range(start, end, flags) 163 * 164 * Invalidate a range of cache entries in the specified 165 * address space. 166 * 167 * - start - start address (inclusive) 168 * - end - end address (exclusive) 169 * - flags - vm_flags for this space 170 */ 171ENTRY(arm1022_flush_user_cache_range) 172 mov ip, #0 173 sub r3, r1, r0 @ calculate total size 174 cmp r3, #CACHE_DLIMIT 175 bhs __flush_whole_cache 176 177#ifndef CONFIG_CPU_DCACHE_DISABLE 1781: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry 179 add r0, r0, #CACHE_DLINESIZE 180 cmp r0, r1 181 blo 1b 182#endif 183 tst r2, #VM_EXEC 184#ifndef CONFIG_CPU_ICACHE_DISABLE 185 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache 186#endif 187 mcrne p15, 0, ip, c7, c10, 4 @ drain WB 188 ret lr 189 190/* 191 * coherent_kern_range(start, end) 192 * 193 * Ensure coherency between the Icache and the Dcache in the 194 * region described by start. If you have non-snooping 195 * Harvard caches, you need to implement this function. 196 * 197 * - start - virtual start address 198 * - end - virtual end address 199 */ 200ENTRY(arm1022_coherent_kern_range) 201 /* FALLTHROUGH */ 202 203/* 204 * coherent_user_range(start, end) 205 * 206 * Ensure coherency between the Icache and the Dcache in the 207 * region described by start. If you have non-snooping 208 * Harvard caches, you need to implement this function. 209 * 210 * - start - virtual start address 211 * - end - virtual end address 212 */ 213ENTRY(arm1022_coherent_user_range) 214 mov ip, #0 215 bic r0, r0, #CACHE_DLINESIZE - 1 2161: 217#ifndef CONFIG_CPU_DCACHE_DISABLE 218 mcr p15, 0, r0, c7, c10, 1 @ clean D entry 219#endif 220#ifndef CONFIG_CPU_ICACHE_DISABLE 221 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry 222#endif 223 add r0, r0, #CACHE_DLINESIZE 224 cmp r0, r1 225 blo 1b 226 mcr p15, 0, ip, c7, c10, 4 @ drain WB 227 mov r0, #0 228 ret lr 229 230/* 231 * flush_kern_dcache_area(void *addr, size_t size) 232 * 233 * Ensure no D cache aliasing occurs, either with itself or 234 * the I cache 235 * 236 * - addr - kernel address 237 * - size - region size 238 */ 239ENTRY(arm1022_flush_kern_dcache_area) 240 mov ip, #0 241#ifndef CONFIG_CPU_DCACHE_DISABLE 242 add r1, r0, r1 2431: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry 244 add r0, r0, #CACHE_DLINESIZE 245 cmp r0, r1 246 blo 1b 247#endif 248 mcr p15, 0, ip, c7, c10, 4 @ drain WB 249 ret lr 250 251/* 252 * dma_inv_range(start, end) 253 * 254 * Invalidate (discard) the specified virtual address range. 255 * May not write back any entries. If 'start' or 'end' 256 * are not cache line aligned, those lines must be written 257 * back. 258 * 259 * - start - virtual start address 260 * - end - virtual end address 261 * 262 * (same as v4wb) 263 */ 264arm1022_dma_inv_range: 265 mov ip, #0 266#ifndef CONFIG_CPU_DCACHE_DISABLE 267 tst r0, #CACHE_DLINESIZE - 1 268 bic r0, r0, #CACHE_DLINESIZE - 1 269 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry 270 tst r1, #CACHE_DLINESIZE - 1 271 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry 2721: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry 273 add r0, r0, #CACHE_DLINESIZE 274 cmp r0, r1 275 blo 1b 276#endif 277 mcr p15, 0, ip, c7, c10, 4 @ drain WB 278 ret lr 279 280/* 281 * dma_clean_range(start, end) 282 * 283 * Clean the specified virtual address range. 284 * 285 * - start - virtual start address 286 * - end - virtual end address 287 * 288 * (same as v4wb) 289 */ 290arm1022_dma_clean_range: 291 mov ip, #0 292#ifndef CONFIG_CPU_DCACHE_DISABLE 293 bic r0, r0, #CACHE_DLINESIZE - 1 2941: mcr p15, 0, r0, c7, c10, 1 @ clean D entry 295 add r0, r0, #CACHE_DLINESIZE 296 cmp r0, r1 297 blo 1b 298#endif 299 mcr p15, 0, ip, c7, c10, 4 @ drain WB 300 ret lr 301 302/* 303 * dma_flush_range(start, end) 304 * 305 * Clean and invalidate the specified virtual address range. 306 * 307 * - start - virtual start address 308 * - end - virtual end address 309 */ 310ENTRY(arm1022_dma_flush_range) 311 mov ip, #0 312#ifndef CONFIG_CPU_DCACHE_DISABLE 313 bic r0, r0, #CACHE_DLINESIZE - 1 3141: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry 315 add r0, r0, #CACHE_DLINESIZE 316 cmp r0, r1 317 blo 1b 318#endif 319 mcr p15, 0, ip, c7, c10, 4 @ drain WB 320 ret lr 321 322/* 323 * dma_map_area(start, size, dir) 324 * - start - kernel virtual start address 325 * - size - size of region 326 * - dir - DMA direction 327 */ 328ENTRY(arm1022_dma_map_area) 329 add r1, r1, r0 330 cmp r2, #DMA_TO_DEVICE 331 beq arm1022_dma_clean_range 332 bcs arm1022_dma_inv_range 333 b arm1022_dma_flush_range 334ENDPROC(arm1022_dma_map_area) 335 336/* 337 * dma_unmap_area(start, size, dir) 338 * - start - kernel virtual start address 339 * - size - size of region 340 * - dir - DMA direction 341 */ 342ENTRY(arm1022_dma_unmap_area) 343 ret lr 344ENDPROC(arm1022_dma_unmap_area) 345 346 .globl arm1022_flush_kern_cache_louis 347 .equ arm1022_flush_kern_cache_louis, arm1022_flush_kern_cache_all 348 349 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S) 350 define_cache_functions arm1022 351 352 .align 5 353ENTRY(cpu_arm1022_dcache_clean_area) 354#ifndef CONFIG_CPU_DCACHE_DISABLE 355 mov ip, #0 3561: mcr p15, 0, r0, c7, c10, 1 @ clean D entry 357 add r0, r0, #CACHE_DLINESIZE 358 subs r1, r1, #CACHE_DLINESIZE 359 bhi 1b 360#endif 361 ret lr 362 363/* =============================== PageTable ============================== */ 364 365/* 366 * cpu_arm1022_switch_mm(pgd) 367 * 368 * Set the translation base pointer to be as described by pgd. 369 * 370 * pgd: new page tables 371 */ 372 .align 5 373ENTRY(cpu_arm1022_switch_mm) 374#ifdef CONFIG_MMU 375#ifndef CONFIG_CPU_DCACHE_DISABLE 376 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments 3771: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries 3782: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index 379 subs r3, r3, #1 << 26 380 bcs 2b @ entries 63 to 0 381 subs r1, r1, #1 << 5 382 bcs 1b @ segments 15 to 0 383#endif 384 mov r1, #0 385#ifndef CONFIG_CPU_ICACHE_DISABLE 386 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache 387#endif 388 mcr p15, 0, r1, c7, c10, 4 @ drain WB 389 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer 390 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs 391#endif 392 ret lr 393 394/* 395 * cpu_arm1022_set_pte_ext(ptep, pte, ext) 396 * 397 * Set a PTE and flush it out 398 */ 399 .align 5 400ENTRY(cpu_arm1022_set_pte_ext) 401#ifdef CONFIG_MMU 402 armv3_set_pte_ext 403 mov r0, r0 404#ifndef CONFIG_CPU_DCACHE_DISABLE 405 mcr p15, 0, r0, c7, c10, 1 @ clean D entry 406#endif 407#endif /* CONFIG_MMU */ 408 ret lr 409 410 .type __arm1022_setup, #function 411__arm1022_setup: 412 mov r0, #0 413 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4 414 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4 415#ifdef CONFIG_MMU 416 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4 417#endif 418 adr r5, arm1022_crval 419 ldmia r5, {r5, r6} 420 mrc p15, 0, r0, c1, c0 @ get control register v4 421 bic r0, r0, r5 422 orr r0, r0, r6 423#ifdef CONFIG_CPU_CACHE_ROUND_ROBIN 424 orr r0, r0, #0x4000 @ .R.............. 425#endif 426 ret lr 427 .size __arm1022_setup, . - __arm1022_setup 428 429 /* 430 * R 431 * .RVI ZFRS BLDP WCAM 432 * .011 1001 ..11 0101 433 * 434 */ 435 .type arm1022_crval, #object 436arm1022_crval: 437 crval clear=0x00007f3f, mmuset=0x00003935, ucset=0x00001930 438 439 __INITDATA 440 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S) 441 define_processor_functions arm1022, dabort=v4t_early_abort, pabort=legacy_pabort 442 443 .section ".rodata" 444 445 string cpu_arch_name, "armv5te" 446 string cpu_elf_name, "v5" 447 string cpu_arm1022_name, "ARM1022" 448 449 .align 450 451 .section ".proc.info.init", #alloc, #execinstr 452 453 .type __arm1022_proc_info,#object 454__arm1022_proc_info: 455 .long 0x4105a220 @ ARM 1022E (v5TE) 456 .long 0xff0ffff0 457 .long PMD_TYPE_SECT | \ 458 PMD_BIT4 | \ 459 PMD_SECT_AP_WRITE | \ 460 PMD_SECT_AP_READ 461 .long PMD_TYPE_SECT | \ 462 PMD_BIT4 | \ 463 PMD_SECT_AP_WRITE | \ 464 PMD_SECT_AP_READ 465 b __arm1022_setup 466 .long cpu_arch_name 467 .long cpu_elf_name 468 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_EDSP 469 .long cpu_arm1022_name 470 .long arm1022_processor_functions 471 .long v4wbi_tlb_fns 472 .long v4wb_user_fns 473 .long arm1022_cache_fns 474 .size __arm1022_proc_info, . - __arm1022_proc_info 475