1/* 2 * linux/arch/arm/mm/proc-arm1020e.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 arm1020e. 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 maintenance instructions. 68 */ 69#define CACHE_DLIMIT 32768 70 71 .text 72/* 73 * cpu_arm1020e_proc_init() 74 */ 75ENTRY(cpu_arm1020e_proc_init) 76 mov pc, lr 77 78/* 79 * cpu_arm1020e_proc_fin() 80 */ 81ENTRY(cpu_arm1020e_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_arm1020e_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 98 .pushsection .idmap.text, "ax" 99ENTRY(cpu_arm1020e_reset) 100 mov ip, #0 101 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches 102 mcr p15, 0, ip, c7, c10, 4 @ drain WB 103#ifdef CONFIG_MMU 104 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs 105#endif 106 mrc p15, 0, ip, c1, c0, 0 @ ctrl register 107 bic ip, ip, #0x000f @ ............wcam 108 bic ip, ip, #0x1100 @ ...i...s........ 109 mcr p15, 0, ip, c1, c0, 0 @ ctrl register 110 mov pc, r0 111ENDPROC(cpu_arm1020e_reset) 112 .popsection 113 114/* 115 * cpu_arm1020e_do_idle() 116 */ 117 .align 5 118ENTRY(cpu_arm1020e_do_idle) 119 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt 120 mov pc, lr 121 122/* ================================= CACHE ================================ */ 123 124 .align 5 125 126/* 127 * flush_icache_all() 128 * 129 * Unconditionally clean and invalidate the entire icache. 130 */ 131ENTRY(arm1020e_flush_icache_all) 132#ifndef CONFIG_CPU_ICACHE_DISABLE 133 mov r0, #0 134 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache 135#endif 136 mov pc, lr 137ENDPROC(arm1020e_flush_icache_all) 138 139/* 140 * flush_user_cache_all() 141 * 142 * Invalidate all cache entries in a particular address 143 * space. 144 */ 145ENTRY(arm1020e_flush_user_cache_all) 146 /* FALLTHROUGH */ 147/* 148 * flush_kern_cache_all() 149 * 150 * Clean and invalidate the entire cache. 151 */ 152ENTRY(arm1020e_flush_kern_cache_all) 153 mov r2, #VM_EXEC 154 mov ip, #0 155__flush_whole_cache: 156#ifndef CONFIG_CPU_DCACHE_DISABLE 157 mcr p15, 0, ip, c7, c10, 4 @ drain WB 158 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments 1591: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries 1602: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index 161 subs r3, r3, #1 << 26 162 bcs 2b @ entries 63 to 0 163 subs r1, r1, #1 << 5 164 bcs 1b @ segments 15 to 0 165#endif 166 tst r2, #VM_EXEC 167#ifndef CONFIG_CPU_ICACHE_DISABLE 168 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache 169#endif 170 mcrne p15, 0, ip, c7, c10, 4 @ drain WB 171 mov pc, lr 172 173/* 174 * flush_user_cache_range(start, end, flags) 175 * 176 * Invalidate a range of cache entries in the specified 177 * address space. 178 * 179 * - start - start address (inclusive) 180 * - end - end address (exclusive) 181 * - flags - vm_flags for this space 182 */ 183ENTRY(arm1020e_flush_user_cache_range) 184 mov ip, #0 185 sub r3, r1, r0 @ calculate total size 186 cmp r3, #CACHE_DLIMIT 187 bhs __flush_whole_cache 188 189#ifndef CONFIG_CPU_DCACHE_DISABLE 1901: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry 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(arm1020e_coherent_kern_range) 213 /* FALLTHROUGH */ 214/* 215 * coherent_user_range(start, end) 216 * 217 * Ensure coherency between the Icache and the Dcache in the 218 * region described by start. If you have non-snooping 219 * Harvard caches, you need to implement this function. 220 * 221 * - start - virtual start address 222 * - end - virtual end address 223 */ 224ENTRY(arm1020e_coherent_user_range) 225 mov ip, #0 226 bic r0, r0, #CACHE_DLINESIZE - 1 2271: 228#ifndef CONFIG_CPU_DCACHE_DISABLE 229 mcr p15, 0, r0, c7, c10, 1 @ clean D entry 230#endif 231#ifndef CONFIG_CPU_ICACHE_DISABLE 232 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry 233#endif 234 add r0, r0, #CACHE_DLINESIZE 235 cmp r0, r1 236 blo 1b 237 mcr p15, 0, ip, c7, c10, 4 @ drain WB 238 mov r0, #0 239 mov pc, lr 240 241/* 242 * flush_kern_dcache_area(void *addr, size_t size) 243 * 244 * Ensure no D cache aliasing occurs, either with itself or 245 * the I cache 246 * 247 * - addr - kernel address 248 * - size - region size 249 */ 250ENTRY(arm1020e_flush_kern_dcache_area) 251 mov ip, #0 252#ifndef CONFIG_CPU_DCACHE_DISABLE 253 add r1, r0, r1 2541: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry 255 add r0, r0, #CACHE_DLINESIZE 256 cmp r0, r1 257 blo 1b 258#endif 259 mcr p15, 0, ip, c7, c10, 4 @ drain WB 260 mov pc, lr 261 262/* 263 * dma_inv_range(start, end) 264 * 265 * Invalidate (discard) the specified virtual address range. 266 * May not write back any entries. If 'start' or 'end' 267 * are not cache line aligned, those lines must be written 268 * back. 269 * 270 * - start - virtual start address 271 * - end - virtual end address 272 * 273 * (same as v4wb) 274 */ 275arm1020e_dma_inv_range: 276 mov ip, #0 277#ifndef CONFIG_CPU_DCACHE_DISABLE 278 tst r0, #CACHE_DLINESIZE - 1 279 bic r0, r0, #CACHE_DLINESIZE - 1 280 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry 281 tst r1, #CACHE_DLINESIZE - 1 282 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry 2831: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry 284 add r0, r0, #CACHE_DLINESIZE 285 cmp r0, r1 286 blo 1b 287#endif 288 mcr p15, 0, ip, c7, c10, 4 @ drain WB 289 mov pc, lr 290 291/* 292 * dma_clean_range(start, end) 293 * 294 * Clean the specified virtual address range. 295 * 296 * - start - virtual start address 297 * - end - virtual end address 298 * 299 * (same as v4wb) 300 */ 301arm1020e_dma_clean_range: 302 mov ip, #0 303#ifndef CONFIG_CPU_DCACHE_DISABLE 304 bic r0, r0, #CACHE_DLINESIZE - 1 3051: mcr p15, 0, r0, c7, c10, 1 @ clean D entry 306 add r0, r0, #CACHE_DLINESIZE 307 cmp r0, r1 308 blo 1b 309#endif 310 mcr p15, 0, ip, c7, c10, 4 @ drain WB 311 mov pc, lr 312 313/* 314 * dma_flush_range(start, end) 315 * 316 * Clean and invalidate the specified virtual address range. 317 * 318 * - start - virtual start address 319 * - end - virtual end address 320 */ 321ENTRY(arm1020e_dma_flush_range) 322 mov ip, #0 323#ifndef CONFIG_CPU_DCACHE_DISABLE 324 bic r0, r0, #CACHE_DLINESIZE - 1 3251: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry 326 add r0, r0, #CACHE_DLINESIZE 327 cmp r0, r1 328 blo 1b 329#endif 330 mcr p15, 0, ip, c7, c10, 4 @ drain WB 331 mov pc, lr 332 333/* 334 * dma_map_area(start, size, dir) 335 * - start - kernel virtual start address 336 * - size - size of region 337 * - dir - DMA direction 338 */ 339ENTRY(arm1020e_dma_map_area) 340 add r1, r1, r0 341 cmp r2, #DMA_TO_DEVICE 342 beq arm1020e_dma_clean_range 343 bcs arm1020e_dma_inv_range 344 b arm1020e_dma_flush_range 345ENDPROC(arm1020e_dma_map_area) 346 347/* 348 * dma_unmap_area(start, size, dir) 349 * - start - kernel virtual start address 350 * - size - size of region 351 * - dir - DMA direction 352 */ 353ENTRY(arm1020e_dma_unmap_area) 354 mov pc, lr 355ENDPROC(arm1020e_dma_unmap_area) 356 357 .globl arm1020e_flush_kern_cache_louis 358 .equ arm1020e_flush_kern_cache_louis, arm1020e_flush_kern_cache_all 359 360 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S) 361 define_cache_functions arm1020e 362 363 .align 5 364ENTRY(cpu_arm1020e_dcache_clean_area) 365#ifndef CONFIG_CPU_DCACHE_DISABLE 366 mov ip, #0 3671: mcr p15, 0, r0, c7, c10, 1 @ clean D entry 368 add r0, r0, #CACHE_DLINESIZE 369 subs r1, r1, #CACHE_DLINESIZE 370 bhi 1b 371#endif 372 mov pc, lr 373 374/* =============================== PageTable ============================== */ 375 376/* 377 * cpu_arm1020e_switch_mm(pgd) 378 * 379 * Set the translation base pointer to be as described by pgd. 380 * 381 * pgd: new page tables 382 */ 383 .align 5 384ENTRY(cpu_arm1020e_switch_mm) 385#ifdef CONFIG_MMU 386#ifndef CONFIG_CPU_DCACHE_DISABLE 387 mcr p15, 0, r3, c7, c10, 4 388 mov r1, #0xF @ 16 segments 3891: mov r3, #0x3F @ 64 entries 3902: mov ip, r3, LSL #26 @ shift up entry 391 orr ip, ip, r1, LSL #5 @ shift in/up index 392 mcr p15, 0, ip, c7, c14, 2 @ Clean & Inval DCache entry 393 mov ip, #0 394 subs r3, r3, #1 395 cmp r3, #0 396 bge 2b @ entries 3F to 0 397 subs r1, r1, #1 398 cmp r1, #0 399 bge 1b @ segments 15 to 0 400 401#endif 402 mov r1, #0 403#ifndef CONFIG_CPU_ICACHE_DISABLE 404 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache 405#endif 406 mcr p15, 0, r1, c7, c10, 4 @ drain WB 407 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer 408 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs 409#endif 410 mov pc, lr 411 412/* 413 * cpu_arm1020e_set_pte(ptep, pte) 414 * 415 * Set a PTE and flush it out 416 */ 417 .align 5 418ENTRY(cpu_arm1020e_set_pte_ext) 419#ifdef CONFIG_MMU 420 armv3_set_pte_ext 421 mov r0, r0 422#ifndef CONFIG_CPU_DCACHE_DISABLE 423 mcr p15, 0, r0, c7, c10, 1 @ clean D entry 424#endif 425#endif /* CONFIG_MMU */ 426 mov pc, lr 427 428 .type __arm1020e_setup, #function 429__arm1020e_setup: 430 mov r0, #0 431 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4 432 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4 433#ifdef CONFIG_MMU 434 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4 435#endif 436 adr r5, arm1020e_crval 437 ldmia r5, {r5, r6} 438 mrc p15, 0, r0, c1, c0 @ get control register v4 439 bic r0, r0, r5 440 orr r0, r0, r6 441#ifdef CONFIG_CPU_CACHE_ROUND_ROBIN 442 orr r0, r0, #0x4000 @ .R.. .... .... .... 443#endif 444 mov pc, lr 445 .size __arm1020e_setup, . - __arm1020e_setup 446 447 /* 448 * R 449 * .RVI ZFRS BLDP WCAM 450 * .011 1001 ..11 0101 451 */ 452 .type arm1020e_crval, #object 453arm1020e_crval: 454 crval clear=0x00007f3f, mmuset=0x00003935, ucset=0x00001930 455 456 __INITDATA 457 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S) 458 define_processor_functions arm1020e, dabort=v4t_early_abort, pabort=legacy_pabort 459 460 .section ".rodata" 461 462 string cpu_arch_name, "armv5te" 463 string cpu_elf_name, "v5" 464 string cpu_arm1020e_name, "ARM1020E" 465 466 .align 467 468 .section ".proc.info.init", #alloc, #execinstr 469 470 .type __arm1020e_proc_info,#object 471__arm1020e_proc_info: 472 .long 0x4105a200 @ ARM 1020TE (Architecture v5TE) 473 .long 0xff0ffff0 474 .long PMD_TYPE_SECT | \ 475 PMD_BIT4 | \ 476 PMD_SECT_AP_WRITE | \ 477 PMD_SECT_AP_READ 478 .long PMD_TYPE_SECT | \ 479 PMD_BIT4 | \ 480 PMD_SECT_AP_WRITE | \ 481 PMD_SECT_AP_READ 482 b __arm1020e_setup 483 .long cpu_arch_name 484 .long cpu_elf_name 485 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_EDSP 486 .long cpu_arm1020e_name 487 .long arm1020e_processor_functions 488 .long v4wbi_tlb_fns 489 .long v4wb_user_fns 490 .long arm1020e_cache_fns 491 .size __arm1020e_proc_info, . - __arm1020e_proc_info 492