1/* 2 * linux/arch/arm/mm/proc-arm1020.S: MMU functions for ARM1020 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 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 * 22 * 23 * These are the low level assembler for performing cache and TLB 24 * functions on the arm1020. 25 * 26 * CONFIG_CPU_ARM1020_CPU_IDLE -> nohlt 27 */ 28#include <linux/linkage.h> 29#include <linux/init.h> 30#include <asm/assembler.h> 31#include <asm/asm-offsets.h> 32#include <asm/hwcap.h> 33#include <asm/pgtable-hwdef.h> 34#include <asm/pgtable.h> 35#include <asm/ptrace.h> 36 37#include "proc-macros.S" 38 39/* 40 * This is the maximum size of an area which will be invalidated 41 * using the single invalidate entry instructions. Anything larger 42 * than this, and we go for the whole cache. 43 * 44 * This value should be chosen such that we choose the cheapest 45 * alternative. 46 */ 47#define MAX_AREA_SIZE 32768 48 49/* 50 * The size of one data cache line. 51 */ 52#define CACHE_DLINESIZE 32 53 54/* 55 * The number of data cache segments. 56 */ 57#define CACHE_DSEGMENTS 16 58 59/* 60 * The number of lines in a cache segment. 61 */ 62#define CACHE_DENTRIES 64 63 64/* 65 * This is the size at which it becomes more efficient to 66 * clean the whole cache, rather than using the individual 67 * cache line maintainence instructions. 68 */ 69#define CACHE_DLIMIT 32768 70 71 .text 72/* 73 * cpu_arm1020_proc_init() 74 */ 75ENTRY(cpu_arm1020_proc_init) 76 mov pc, lr 77 78/* 79 * cpu_arm1020_proc_fin() 80 */ 81ENTRY(cpu_arm1020_proc_fin) 82 mrc p15, 0, r0, c1, c0, 0 @ ctrl register 83 bic r0, r0, #0x1000 @ ...i............ 84 bic r0, r0, #0x000e @ ............wca. 85 mcr p15, 0, r0, c1, c0, 0 @ disable caches 86 mov pc, lr 87 88/* 89 * cpu_arm1020_reset(loc) 90 * 91 * Perform a soft reset of the system. Put the CPU into the 92 * same state as it would be if it had been reset, and branch 93 * to what would be the reset vector. 94 * 95 * loc: location to jump to for soft reset 96 */ 97 .align 5 98ENTRY(cpu_arm1020_reset) 99 mov ip, #0 100 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches 101 mcr p15, 0, ip, c7, c10, 4 @ drain WB 102#ifdef CONFIG_MMU 103 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs 104#endif 105 mrc p15, 0, ip, c1, c0, 0 @ ctrl register 106 bic ip, ip, #0x000f @ ............wcam 107 bic ip, ip, #0x1100 @ ...i...s........ 108 mcr p15, 0, ip, c1, c0, 0 @ ctrl register 109 mov pc, r0 110 111/* 112 * cpu_arm1020_do_idle() 113 */ 114 .align 5 115ENTRY(cpu_arm1020_do_idle) 116 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt 117 mov pc, lr 118 119/* ================================= CACHE ================================ */ 120 121 .align 5 122 123/* 124 * flush_icache_all() 125 * 126 * Unconditionally clean and invalidate the entire icache. 127 */ 128ENTRY(arm1020_flush_icache_all) 129#ifndef CONFIG_CPU_ICACHE_DISABLE 130 mov r0, #0 131 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache 132#endif 133 mov pc, lr 134ENDPROC(arm1020_flush_icache_all) 135 136/* 137 * flush_user_cache_all() 138 * 139 * Invalidate all cache entries in a particular address 140 * space. 141 */ 142ENTRY(arm1020_flush_user_cache_all) 143 /* FALLTHROUGH */ 144/* 145 * flush_kern_cache_all() 146 * 147 * Clean and invalidate the entire cache. 148 */ 149ENTRY(arm1020_flush_kern_cache_all) 150 mov r2, #VM_EXEC 151 mov ip, #0 152__flush_whole_cache: 153#ifndef CONFIG_CPU_DCACHE_DISABLE 154 mcr p15, 0, ip, c7, c10, 4 @ drain WB 155 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments 1561: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries 1572: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index 158 mcr p15, 0, ip, c7, c10, 4 @ drain WB 159 subs r3, r3, #1 << 26 160 bcs 2b @ entries 63 to 0 161 subs r1, r1, #1 << 5 162 bcs 1b @ segments 15 to 0 163#endif 164 tst r2, #VM_EXEC 165#ifndef CONFIG_CPU_ICACHE_DISABLE 166 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache 167#endif 168 mcrne p15, 0, ip, c7, c10, 4 @ drain WB 169 mov pc, lr 170 171/* 172 * flush_user_cache_range(start, end, flags) 173 * 174 * Invalidate a range of cache entries in the specified 175 * address space. 176 * 177 * - start - start address (inclusive) 178 * - end - end address (exclusive) 179 * - flags - vm_flags for this space 180 */ 181ENTRY(arm1020_flush_user_cache_range) 182 mov ip, #0 183 sub r3, r1, r0 @ calculate total size 184 cmp r3, #CACHE_DLIMIT 185 bhs __flush_whole_cache 186 187#ifndef CONFIG_CPU_DCACHE_DISABLE 188 mcr p15, 0, ip, c7, c10, 4 1891: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry 190 mcr p15, 0, ip, c7, c10, 4 @ drain WB 191 add r0, r0, #CACHE_DLINESIZE 192 cmp r0, r1 193 blo 1b 194#endif 195 tst r2, #VM_EXEC 196#ifndef CONFIG_CPU_ICACHE_DISABLE 197 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache 198#endif 199 mcrne p15, 0, ip, c7, c10, 4 @ drain WB 200 mov pc, lr 201 202/* 203 * coherent_kern_range(start, end) 204 * 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. 208 * 209 * - start - virtual start address 210 * - end - virtual end address 211 */ 212ENTRY(arm1020_coherent_kern_range) 213 /* FALLTRHOUGH */ 214 215/* 216 * coherent_user_range(start, end) 217 * 218 * Ensure coherency between the Icache and the Dcache in the 219 * region described by start. If you have non-snooping 220 * Harvard caches, you need to implement this function. 221 * 222 * - start - virtual start address 223 * - end - virtual end address 224 */ 225ENTRY(arm1020_coherent_user_range) 226 mov ip, #0 227 bic r0, r0, #CACHE_DLINESIZE - 1 228 mcr p15, 0, ip, c7, c10, 4 2291: 230#ifndef CONFIG_CPU_DCACHE_DISABLE 231 mcr p15, 0, r0, c7, c10, 1 @ clean D entry 232 mcr p15, 0, ip, c7, c10, 4 @ drain WB 233#endif 234#ifndef CONFIG_CPU_ICACHE_DISABLE 235 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry 236#endif 237 add r0, r0, #CACHE_DLINESIZE 238 cmp r0, r1 239 blo 1b 240 mcr p15, 0, ip, c7, c10, 4 @ drain WB 241 mov pc, lr 242 243/* 244 * flush_kern_dcache_area(void *addr, size_t size) 245 * 246 * Ensure no D cache aliasing occurs, either with itself or 247 * the I cache 248 * 249 * - addr - kernel address 250 * - size - region size 251 */ 252ENTRY(arm1020_flush_kern_dcache_area) 253 mov ip, #0 254#ifndef CONFIG_CPU_DCACHE_DISABLE 255 add r1, r0, r1 2561: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry 257 mcr p15, 0, ip, c7, c10, 4 @ drain WB 258 add r0, r0, #CACHE_DLINESIZE 259 cmp r0, r1 260 blo 1b 261#endif 262 mcr p15, 0, ip, c7, c10, 4 @ drain WB 263 mov pc, lr 264 265/* 266 * dma_inv_range(start, end) 267 * 268 * Invalidate (discard) the specified virtual address range. 269 * May not write back any entries. If 'start' or 'end' 270 * are not cache line aligned, those lines must be written 271 * back. 272 * 273 * - start - virtual start address 274 * - end - virtual end address 275 * 276 * (same as v4wb) 277 */ 278arm1020_dma_inv_range: 279 mov ip, #0 280#ifndef CONFIG_CPU_DCACHE_DISABLE 281 tst r0, #CACHE_DLINESIZE - 1 282 bic r0, r0, #CACHE_DLINESIZE - 1 283 mcrne p15, 0, ip, c7, c10, 4 284 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry 285 mcrne p15, 0, ip, c7, c10, 4 @ drain WB 286 tst r1, #CACHE_DLINESIZE - 1 287 mcrne p15, 0, ip, c7, c10, 4 288 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry 289 mcrne p15, 0, ip, c7, c10, 4 @ drain WB 2901: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry 291 add r0, r0, #CACHE_DLINESIZE 292 cmp r0, r1 293 blo 1b 294#endif 295 mcr p15, 0, ip, c7, c10, 4 @ drain WB 296 mov pc, lr 297 298/* 299 * dma_clean_range(start, end) 300 * 301 * Clean the specified virtual address range. 302 * 303 * - start - virtual start address 304 * - end - virtual end address 305 * 306 * (same as v4wb) 307 */ 308arm1020_dma_clean_range: 309 mov ip, #0 310#ifndef CONFIG_CPU_DCACHE_DISABLE 311 bic r0, r0, #CACHE_DLINESIZE - 1 3121: mcr p15, 0, r0, c7, c10, 1 @ clean D entry 313 mcr p15, 0, ip, c7, c10, 4 @ drain WB 314 add r0, r0, #CACHE_DLINESIZE 315 cmp r0, r1 316 blo 1b 317#endif 318 mcr p15, 0, ip, c7, c10, 4 @ drain WB 319 mov pc, lr 320 321/* 322 * dma_flush_range(start, end) 323 * 324 * Clean and invalidate the specified virtual address range. 325 * 326 * - start - virtual start address 327 * - end - virtual end address 328 */ 329ENTRY(arm1020_dma_flush_range) 330 mov ip, #0 331#ifndef CONFIG_CPU_DCACHE_DISABLE 332 bic r0, r0, #CACHE_DLINESIZE - 1 333 mcr p15, 0, ip, c7, c10, 4 3341: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry 335 mcr p15, 0, ip, c7, c10, 4 @ drain WB 336 add r0, r0, #CACHE_DLINESIZE 337 cmp r0, r1 338 blo 1b 339#endif 340 mcr p15, 0, ip, c7, c10, 4 @ drain WB 341 mov pc, lr 342 343/* 344 * dma_map_area(start, size, dir) 345 * - start - kernel virtual start address 346 * - size - size of region 347 * - dir - DMA direction 348 */ 349ENTRY(arm1020_dma_map_area) 350 add r1, r1, r0 351 cmp r2, #DMA_TO_DEVICE 352 beq arm1020_dma_clean_range 353 bcs arm1020_dma_inv_range 354 b arm1020_dma_flush_range 355ENDPROC(arm1020_dma_map_area) 356 357/* 358 * dma_unmap_area(start, size, dir) 359 * - start - kernel virtual start address 360 * - size - size of region 361 * - dir - DMA direction 362 */ 363ENTRY(arm1020_dma_unmap_area) 364 mov pc, lr 365ENDPROC(arm1020_dma_unmap_area) 366 367ENTRY(arm1020_cache_fns) 368 .long arm1020_flush_icache_all 369 .long arm1020_flush_kern_cache_all 370 .long arm1020_flush_user_cache_all 371 .long arm1020_flush_user_cache_range 372 .long arm1020_coherent_kern_range 373 .long arm1020_coherent_user_range 374 .long arm1020_flush_kern_dcache_area 375 .long arm1020_dma_map_area 376 .long arm1020_dma_unmap_area 377 .long arm1020_dma_flush_range 378 379 .align 5 380ENTRY(cpu_arm1020_dcache_clean_area) 381#ifndef CONFIG_CPU_DCACHE_DISABLE 382 mov ip, #0 3831: mcr p15, 0, r0, c7, c10, 1 @ clean D entry 384 mcr p15, 0, ip, c7, c10, 4 @ drain WB 385 add r0, r0, #CACHE_DLINESIZE 386 subs r1, r1, #CACHE_DLINESIZE 387 bhi 1b 388#endif 389 mov pc, lr 390 391/* =============================== PageTable ============================== */ 392 393/* 394 * cpu_arm1020_switch_mm(pgd) 395 * 396 * Set the translation base pointer to be as described by pgd. 397 * 398 * pgd: new page tables 399 */ 400 .align 5 401ENTRY(cpu_arm1020_switch_mm) 402#ifdef CONFIG_MMU 403#ifndef CONFIG_CPU_DCACHE_DISABLE 404 mcr p15, 0, r3, c7, c10, 4 405 mov r1, #0xF @ 16 segments 4061: mov r3, #0x3F @ 64 entries 4072: mov ip, r3, LSL #26 @ shift up entry 408 orr ip, ip, r1, LSL #5 @ shift in/up index 409 mcr p15, 0, ip, c7, c14, 2 @ Clean & Inval DCache entry 410 mov ip, #0 411 mcr p15, 0, ip, c7, c10, 4 412 subs r3, r3, #1 413 cmp r3, #0 414 bge 2b @ entries 3F to 0 415 subs r1, r1, #1 416 cmp r1, #0 417 bge 1b @ segments 15 to 0 418 419#endif 420 mov r1, #0 421#ifndef CONFIG_CPU_ICACHE_DISABLE 422 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache 423#endif 424 mcr p15, 0, r1, c7, c10, 4 @ drain WB 425 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer 426 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs 427#endif /* CONFIG_MMU */ 428 mov pc, lr 429 430/* 431 * cpu_arm1020_set_pte(ptep, pte) 432 * 433 * Set a PTE and flush it out 434 */ 435 .align 5 436ENTRY(cpu_arm1020_set_pte_ext) 437#ifdef CONFIG_MMU 438 armv3_set_pte_ext 439 mov r0, r0 440#ifndef CONFIG_CPU_DCACHE_DISABLE 441 mcr p15, 0, r0, c7, c10, 4 442 mcr p15, 0, r0, c7, c10, 1 @ clean D entry 443#endif 444 mcr p15, 0, r0, c7, c10, 4 @ drain WB 445#endif /* CONFIG_MMU */ 446 mov pc, lr 447 448 __CPUINIT 449 450 .type __arm1020_setup, #function 451__arm1020_setup: 452 mov r0, #0 453 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4 454 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4 455#ifdef CONFIG_MMU 456 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4 457#endif 458 459 adr r5, arm1020_crval 460 ldmia r5, {r5, r6} 461 mrc p15, 0, r0, c1, c0 @ get control register v4 462 bic r0, r0, r5 463 orr r0, r0, r6 464#ifdef CONFIG_CPU_CACHE_ROUND_ROBIN 465 orr r0, r0, #0x4000 @ .R.. .... .... .... 466#endif 467 mov pc, lr 468 .size __arm1020_setup, . - __arm1020_setup 469 470 /* 471 * R 472 * .RVI ZFRS BLDP WCAM 473 * .011 1001 ..11 0101 474 */ 475 .type arm1020_crval, #object 476arm1020_crval: 477 crval clear=0x0000593f, mmuset=0x00003935, ucset=0x00001930 478 479 __INITDATA 480 481/* 482 * Purpose : Function pointers used to access above functions - all calls 483 * come through these 484 */ 485 .type arm1020_processor_functions, #object 486arm1020_processor_functions: 487 .word v4t_early_abort 488 .word legacy_pabort 489 .word cpu_arm1020_proc_init 490 .word cpu_arm1020_proc_fin 491 .word cpu_arm1020_reset 492 .word cpu_arm1020_do_idle 493 .word cpu_arm1020_dcache_clean_area 494 .word cpu_arm1020_switch_mm 495 .word cpu_arm1020_set_pte_ext 496 .word 0 497 .word 0 498 .word 0 499 .size arm1020_processor_functions, . - arm1020_processor_functions 500 501 .section ".rodata" 502 503 .type cpu_arch_name, #object 504cpu_arch_name: 505 .asciz "armv5t" 506 .size cpu_arch_name, . - cpu_arch_name 507 508 .type cpu_elf_name, #object 509cpu_elf_name: 510 .asciz "v5" 511 .size cpu_elf_name, . - cpu_elf_name 512 513 .type cpu_arm1020_name, #object 514cpu_arm1020_name: 515 .ascii "ARM1020" 516#ifndef CONFIG_CPU_ICACHE_DISABLE 517 .ascii "i" 518#endif 519#ifndef CONFIG_CPU_DCACHE_DISABLE 520 .ascii "d" 521#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH 522 .ascii "(wt)" 523#else 524 .ascii "(wb)" 525#endif 526#endif 527#ifndef CONFIG_CPU_BPREDICT_DISABLE 528 .ascii "B" 529#endif 530#ifdef CONFIG_CPU_CACHE_ROUND_ROBIN 531 .ascii "RR" 532#endif 533 .ascii "\0" 534 .size cpu_arm1020_name, . - cpu_arm1020_name 535 536 .align 537 538 .section ".proc.info.init", #alloc, #execinstr 539 540 .type __arm1020_proc_info,#object 541__arm1020_proc_info: 542 .long 0x4104a200 @ ARM 1020T (Architecture v5T) 543 .long 0xff0ffff0 544 .long PMD_TYPE_SECT | \ 545 PMD_SECT_AP_WRITE | \ 546 PMD_SECT_AP_READ 547 .long PMD_TYPE_SECT | \ 548 PMD_SECT_AP_WRITE | \ 549 PMD_SECT_AP_READ 550 b __arm1020_setup 551 .long cpu_arch_name 552 .long cpu_elf_name 553 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB 554 .long cpu_arm1020_name 555 .long arm1020_processor_functions 556 .long v4wbi_tlb_fns 557 .long v4wb_user_fns 558 .long arm1020_cache_fns 559 .size __arm1020_proc_info, . - __arm1020_proc_info 560