1/* 2 * linux/arch/arm/mm/proc-arm1026.S: MMU functions for ARM1026EJ-S 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 ARM1026EJ-S. 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_arm1026_proc_init() 63 */ 64ENTRY(cpu_arm1026_proc_init) 65 ret lr 66 67/* 68 * cpu_arm1026_proc_fin() 69 */ 70ENTRY(cpu_arm1026_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_arm1026_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_arm1026_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_arm1026_reset) 101 .popsection 102 103/* 104 * cpu_arm1026_do_idle() 105 */ 106 .align 5 107ENTRY(cpu_arm1026_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(arm1026_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(arm1026_flush_icache_all) 127 128/* 129 * flush_user_cache_all() 130 * 131 * Invalidate all cache entries in a particular address 132 * space. 133 */ 134ENTRY(arm1026_flush_user_cache_all) 135 /* FALLTHROUGH */ 136/* 137 * flush_kern_cache_all() 138 * 139 * Clean and invalidate the entire cache. 140 */ 141ENTRY(arm1026_flush_kern_cache_all) 142 mov r2, #VM_EXEC 143 mov ip, #0 144__flush_whole_cache: 145#ifndef CONFIG_CPU_DCACHE_DISABLE 1461: mrc p15, 0, r15, c7, c14, 3 @ test, clean, invalidate 147 bne 1b 148#endif 149 tst r2, #VM_EXEC 150#ifndef CONFIG_CPU_ICACHE_DISABLE 151 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache 152#endif 153 mcrne p15, 0, ip, c7, c10, 4 @ drain WB 154 ret lr 155 156/* 157 * flush_user_cache_range(start, end, flags) 158 * 159 * Invalidate a range of cache entries in the specified 160 * address space. 161 * 162 * - start - start address (inclusive) 163 * - end - end address (exclusive) 164 * - flags - vm_flags for this space 165 */ 166ENTRY(arm1026_flush_user_cache_range) 167 mov ip, #0 168 sub r3, r1, r0 @ calculate total size 169 cmp r3, #CACHE_DLIMIT 170 bhs __flush_whole_cache 171 172#ifndef CONFIG_CPU_DCACHE_DISABLE 1731: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry 174 add r0, r0, #CACHE_DLINESIZE 175 cmp r0, r1 176 blo 1b 177#endif 178 tst r2, #VM_EXEC 179#ifndef CONFIG_CPU_ICACHE_DISABLE 180 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache 181#endif 182 mcrne p15, 0, ip, c7, c10, 4 @ drain WB 183 ret lr 184 185/* 186 * coherent_kern_range(start, end) 187 * 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. 191 * 192 * - start - virtual start address 193 * - end - virtual end address 194 */ 195ENTRY(arm1026_coherent_kern_range) 196 /* FALLTHROUGH */ 197/* 198 * coherent_user_range(start, end) 199 * 200 * Ensure coherency between the Icache and the Dcache in the 201 * region described by start. If you have non-snooping 202 * Harvard caches, you need to implement this function. 203 * 204 * - start - virtual start address 205 * - end - virtual end address 206 */ 207ENTRY(arm1026_coherent_user_range) 208 mov ip, #0 209 bic r0, r0, #CACHE_DLINESIZE - 1 2101: 211#ifndef CONFIG_CPU_DCACHE_DISABLE 212 mcr p15, 0, r0, c7, c10, 1 @ clean D entry 213#endif 214#ifndef CONFIG_CPU_ICACHE_DISABLE 215 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry 216#endif 217 add r0, r0, #CACHE_DLINESIZE 218 cmp r0, r1 219 blo 1b 220 mcr p15, 0, ip, c7, c10, 4 @ drain WB 221 mov r0, #0 222 ret lr 223 224/* 225 * flush_kern_dcache_area(void *addr, size_t size) 226 * 227 * Ensure no D cache aliasing occurs, either with itself or 228 * the I cache 229 * 230 * - addr - kernel address 231 * - size - region size 232 */ 233ENTRY(arm1026_flush_kern_dcache_area) 234 mov ip, #0 235#ifndef CONFIG_CPU_DCACHE_DISABLE 236 add r1, r0, r1 2371: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry 238 add r0, r0, #CACHE_DLINESIZE 239 cmp r0, r1 240 blo 1b 241#endif 242 mcr p15, 0, ip, c7, c10, 4 @ drain WB 243 ret lr 244 245/* 246 * dma_inv_range(start, end) 247 * 248 * Invalidate (discard) the specified virtual address range. 249 * May not write back any entries. If 'start' or 'end' 250 * are not cache line aligned, those lines must be written 251 * back. 252 * 253 * - start - virtual start address 254 * - end - virtual end address 255 * 256 * (same as v4wb) 257 */ 258arm1026_dma_inv_range: 259 mov ip, #0 260#ifndef CONFIG_CPU_DCACHE_DISABLE 261 tst r0, #CACHE_DLINESIZE - 1 262 bic r0, r0, #CACHE_DLINESIZE - 1 263 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry 264 tst r1, #CACHE_DLINESIZE - 1 265 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry 2661: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry 267 add r0, r0, #CACHE_DLINESIZE 268 cmp r0, r1 269 blo 1b 270#endif 271 mcr p15, 0, ip, c7, c10, 4 @ drain WB 272 ret lr 273 274/* 275 * dma_clean_range(start, end) 276 * 277 * Clean the specified virtual address range. 278 * 279 * - start - virtual start address 280 * - end - virtual end address 281 * 282 * (same as v4wb) 283 */ 284arm1026_dma_clean_range: 285 mov ip, #0 286#ifndef CONFIG_CPU_DCACHE_DISABLE 287 bic r0, r0, #CACHE_DLINESIZE - 1 2881: mcr p15, 0, r0, c7, c10, 1 @ clean D entry 289 add r0, r0, #CACHE_DLINESIZE 290 cmp r0, r1 291 blo 1b 292#endif 293 mcr p15, 0, ip, c7, c10, 4 @ drain WB 294 ret lr 295 296/* 297 * dma_flush_range(start, end) 298 * 299 * Clean and invalidate the specified virtual address range. 300 * 301 * - start - virtual start address 302 * - end - virtual end address 303 */ 304ENTRY(arm1026_dma_flush_range) 305 mov ip, #0 306#ifndef CONFIG_CPU_DCACHE_DISABLE 307 bic r0, r0, #CACHE_DLINESIZE - 1 3081: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry 309 add r0, r0, #CACHE_DLINESIZE 310 cmp r0, r1 311 blo 1b 312#endif 313 mcr p15, 0, ip, c7, c10, 4 @ drain WB 314 ret lr 315 316/* 317 * dma_map_area(start, size, dir) 318 * - start - kernel virtual start address 319 * - size - size of region 320 * - dir - DMA direction 321 */ 322ENTRY(arm1026_dma_map_area) 323 add r1, r1, r0 324 cmp r2, #DMA_TO_DEVICE 325 beq arm1026_dma_clean_range 326 bcs arm1026_dma_inv_range 327 b arm1026_dma_flush_range 328ENDPROC(arm1026_dma_map_area) 329 330/* 331 * dma_unmap_area(start, size, dir) 332 * - start - kernel virtual start address 333 * - size - size of region 334 * - dir - DMA direction 335 */ 336ENTRY(arm1026_dma_unmap_area) 337 ret lr 338ENDPROC(arm1026_dma_unmap_area) 339 340 .globl arm1026_flush_kern_cache_louis 341 .equ arm1026_flush_kern_cache_louis, arm1026_flush_kern_cache_all 342 343 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S) 344 define_cache_functions arm1026 345 346 .align 5 347ENTRY(cpu_arm1026_dcache_clean_area) 348#ifndef CONFIG_CPU_DCACHE_DISABLE 349 mov ip, #0 3501: mcr p15, 0, r0, c7, c10, 1 @ clean D entry 351 add r0, r0, #CACHE_DLINESIZE 352 subs r1, r1, #CACHE_DLINESIZE 353 bhi 1b 354#endif 355 ret lr 356 357/* =============================== PageTable ============================== */ 358 359/* 360 * cpu_arm1026_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 367ENTRY(cpu_arm1026_switch_mm) 368#ifdef CONFIG_MMU 369 mov r1, #0 370#ifndef CONFIG_CPU_DCACHE_DISABLE 3711: mrc p15, 0, r15, c7, c14, 3 @ test, clean, invalidate 372 bne 1b 373#endif 374#ifndef CONFIG_CPU_ICACHE_DISABLE 375 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache 376#endif 377 mcr p15, 0, r1, c7, c10, 4 @ drain WB 378 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer 379 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs 380#endif 381 ret lr 382 383/* 384 * cpu_arm1026_set_pte_ext(ptep, pte, ext) 385 * 386 * Set a PTE and flush it out 387 */ 388 .align 5 389ENTRY(cpu_arm1026_set_pte_ext) 390#ifdef CONFIG_MMU 391 armv3_set_pte_ext 392 mov r0, r0 393#ifndef CONFIG_CPU_DCACHE_DISABLE 394 mcr p15, 0, r0, c7, c10, 1 @ clean D entry 395#endif 396#endif /* CONFIG_MMU */ 397 ret lr 398 399 .type __arm1026_setup, #function 400__arm1026_setup: 401 mov r0, #0 402 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4 403 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4 404#ifdef CONFIG_MMU 405 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4 406 mcr p15, 0, r4, c2, c0 @ load page table pointer 407#endif 408#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH 409 mov r0, #4 @ explicitly disable writeback 410 mcr p15, 7, r0, c15, c0, 0 411#endif 412 adr r5, arm1026_crval 413 ldmia r5, {r5, r6} 414 mrc p15, 0, r0, c1, c0 @ get control register v4 415 bic r0, r0, r5 416 orr r0, r0, r6 417#ifdef CONFIG_CPU_CACHE_ROUND_ROBIN 418 orr r0, r0, #0x4000 @ .R.. .... .... .... 419#endif 420 ret lr 421 .size __arm1026_setup, . - __arm1026_setup 422 423 /* 424 * R 425 * .RVI ZFRS BLDP WCAM 426 * .011 1001 ..11 0101 427 * 428 */ 429 .type arm1026_crval, #object 430arm1026_crval: 431 crval clear=0x00007f3f, mmuset=0x00003935, ucset=0x00001934 432 433 __INITDATA 434 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S) 435 define_processor_functions arm1026, dabort=v5t_early_abort, pabort=legacy_pabort 436 437 .section .rodata 438 439 string cpu_arch_name, "armv5tej" 440 string cpu_elf_name, "v5" 441 .align 442 string cpu_arm1026_name, "ARM1026EJ-S" 443 .align 444 445 .section ".proc.info.init", #alloc, #execinstr 446 447 .type __arm1026_proc_info,#object 448__arm1026_proc_info: 449 .long 0x4106a260 @ ARM 1026EJ-S (v5TEJ) 450 .long 0xff0ffff0 451 .long PMD_TYPE_SECT | \ 452 PMD_BIT4 | \ 453 PMD_SECT_AP_WRITE | \ 454 PMD_SECT_AP_READ 455 .long PMD_TYPE_SECT | \ 456 PMD_BIT4 | \ 457 PMD_SECT_AP_WRITE | \ 458 PMD_SECT_AP_READ 459 b __arm1026_setup 460 .long cpu_arch_name 461 .long cpu_elf_name 462 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_JAVA 463 .long cpu_arm1026_name 464 .long arm1026_processor_functions 465 .long v4wbi_tlb_fns 466 .long v4wb_user_fns 467 .long arm1026_cache_fns 468 .size __arm1026_proc_info, . - __arm1026_proc_info 469